60 files changed, 11539 insertions, 0 deletions
diff --git a/lib/.indent.pro b/lib/.indent.pro
new file mode 100644
index 0000000..fe572bb
--- /dev/null
+++ b/lib/.indent.pro
@@ -0,0 +1,5 @@
+-kr
+-i8
+-bad
+-pcs
+-l80
diff --git a/lib/Makefile.am b/lib/Makefile.am
new file mode 100644
index 0000000..3a50b46
--- /dev/null
+++ b/lib/Makefile.am
@@ -0,0 +1,82 @@
+
+AUTOMAKE_OPTIONS = 1.0 foreign
+
+DEFS =
+
+noinst_LTLIBRARIES = libshadow.la
+
+libshadow_la_CPPFLAGS = $(ECONF_CPPFLAGS)
+if HAVE_VENDORDIR
+libshadow_la_CPPFLAGS += -DVENDORDIR=\"$(VENDORDIR)\"
+endif
+
+libshadow_la_CPPFLAGS += -I$(top_srcdir)
+
+libshadow_la_SOURCES = \
+	commonio.c \
+	commonio.h \
+	defines.h \
+	encrypt.c \
+	exitcodes.h \
+	faillog.h \
+	fields.c \
+	fputsx.c \
+	getdef.c \
+	getdef.h \
+	get_gid.c \
+	getlong.c \
+	get_pid.c \
+	get_uid.c \
+	getulong.c \
+	groupio.c \
+	groupmem.c \
+	groupio.h \
+	gshadow.c \
+	lockpw.c \
+	nss.c \
+	nscd.c \
+	nscd.h \
+	shadowlog.c \
+	shadowlog.h \
+	shadowlog_internal.h \
+	sssd.c \
+	sssd.h \
+	pam_defs.h \
+	port.c \
+	port.h \
+	prototypes.h \
+	pwauth.c \
+	pwauth.h \
+	pwio.c \
+	pwio.h \
+	pwmem.c \
+	run_part.h \
+	run_part.c \
+	subordinateio.h \
+	subordinateio.c \
+	selinux.c \
+	semanage.c \
+	sgetgrent.c \
+	sgetpwent.c \
+	sgetspent.c \
+	sgroupio.c \
+	sgroupio.h\
+	shadow.c \
+	shadowio.c \
+	shadowio.h \
+	shadowmem.c \
+	spawn.c \
+	utent.c
+
+if WITH_TCB
+libshadow_la_SOURCES += tcbfuncs.c tcbfuncs.h
+endif
+
+# These files are unneeded for some reason, listed in
+# order of appearance:
+#
+# sources for dbm support (not yet used)
+
+EXTRA_DIST = \
+	.indent.pro \
+	gshadow_.h
diff --git a/lib/Makefile.in b/lib/Makefile.in
new file mode 100644
index 0000000..9eef01c
--- /dev/null
+++ b/lib/Makefile.in
@@ -0,0 +1,1085 @@
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+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+VPATH = @srcdir@
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+}
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+      -[JT]) skip_next=yes;; \
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+@WITH_TCB_TRUE@am__append_2 = tcbfuncs.c tcbfuncs.h
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+am__aclocal_m4_deps = $(top_srcdir)/m4/gettext.m4 \
+	$(top_srcdir)/m4/iconv.m4 $(top_srcdir)/m4/intlmacosx.m4 \
+	$(top_srcdir)/m4/lib-ld.m4 $(top_srcdir)/m4/lib-link.m4 \
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+libshadow_la_LIBADD =
+am__libshadow_la_SOURCES_DIST = commonio.c commonio.h defines.h \
+	encrypt.c exitcodes.h faillog.h fields.c fputsx.c getdef.c \
+	getdef.h get_gid.c getlong.c get_pid.c get_uid.c getulong.c \
+	groupio.c groupmem.c groupio.h gshadow.c lockpw.c nss.c nscd.c \
+	nscd.h shadowlog.c shadowlog.h shadowlog_internal.h sssd.c \
+	sssd.h pam_defs.h port.c port.h prototypes.h pwauth.c pwauth.h \
+	pwio.c pwio.h pwmem.c run_part.h run_part.c subordinateio.h \
+	subordinateio.c selinux.c semanage.c sgetgrent.c sgetpwent.c \
+	sgetspent.c sgroupio.c sgroupio.h shadow.c shadowio.c \
+	shadowio.h shadowmem.c spawn.c utent.c tcbfuncs.c tcbfuncs.h
+@WITH_TCB_TRUE@am__objects_1 = libshadow_la-tcbfuncs.lo
+am_libshadow_la_OBJECTS = libshadow_la-commonio.lo \
+	libshadow_la-encrypt.lo libshadow_la-fields.lo \
+	libshadow_la-fputsx.lo libshadow_la-getdef.lo \
+	libshadow_la-get_gid.lo libshadow_la-getlong.lo \
+	libshadow_la-get_pid.lo libshadow_la-get_uid.lo \
+	libshadow_la-getulong.lo libshadow_la-groupio.lo \
+	libshadow_la-groupmem.lo libshadow_la-gshadow.lo \
+	libshadow_la-lockpw.lo libshadow_la-nss.lo \
+	libshadow_la-nscd.lo libshadow_la-shadowlog.lo \
+	libshadow_la-sssd.lo libshadow_la-port.lo \
+	libshadow_la-pwauth.lo libshadow_la-pwio.lo \
+	libshadow_la-pwmem.lo libshadow_la-run_part.lo \
+	libshadow_la-subordinateio.lo libshadow_la-selinux.lo \
+	libshadow_la-semanage.lo libshadow_la-sgetgrent.lo \
+	libshadow_la-sgetpwent.lo libshadow_la-sgetspent.lo \
+	libshadow_la-sgroupio.lo libshadow_la-shadow.lo \
+	libshadow_la-shadowio.lo libshadow_la-shadowmem.lo \
+	libshadow_la-spawn.lo libshadow_la-utent.lo $(am__objects_1)
+libshadow_la_OBJECTS = $(am_libshadow_la_OBJECTS)
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+	./$(DEPDIR)/libshadow_la-encrypt.Plo \
+	./$(DEPDIR)/libshadow_la-fields.Plo \
+	./$(DEPDIR)/libshadow_la-fputsx.Plo \
+	./$(DEPDIR)/libshadow_la-get_gid.Plo \
+	./$(DEPDIR)/libshadow_la-get_pid.Plo \
+	./$(DEPDIR)/libshadow_la-get_uid.Plo \
+	./$(DEPDIR)/libshadow_la-getdef.Plo \
+	./$(DEPDIR)/libshadow_la-getlong.Plo \
+	./$(DEPDIR)/libshadow_la-getulong.Plo \
+	./$(DEPDIR)/libshadow_la-groupio.Plo \
+	./$(DEPDIR)/libshadow_la-groupmem.Plo \
+	./$(DEPDIR)/libshadow_la-gshadow.Plo \
+	./$(DEPDIR)/libshadow_la-lockpw.Plo \
+	./$(DEPDIR)/libshadow_la-nscd.Plo \
+	./$(DEPDIR)/libshadow_la-nss.Plo \
+	./$(DEPDIR)/libshadow_la-port.Plo \
+	./$(DEPDIR)/libshadow_la-pwauth.Plo \
+	./$(DEPDIR)/libshadow_la-pwio.Plo \
+	./$(DEPDIR)/libshadow_la-pwmem.Plo \
+	./$(DEPDIR)/libshadow_la-run_part.Plo \
+	./$(DEPDIR)/libshadow_la-selinux.Plo \
+	./$(DEPDIR)/libshadow_la-semanage.Plo \
+	./$(DEPDIR)/libshadow_la-sgetgrent.Plo \
+	./$(DEPDIR)/libshadow_la-sgetpwent.Plo \
+	./$(DEPDIR)/libshadow_la-sgetspent.Plo \
+	./$(DEPDIR)/libshadow_la-sgroupio.Plo \
+	./$(DEPDIR)/libshadow_la-shadow.Plo \
+	./$(DEPDIR)/libshadow_la-shadowio.Plo \
+	./$(DEPDIR)/libshadow_la-shadowlog.Plo \
+	./$(DEPDIR)/libshadow_la-shadowmem.Plo \
+	./$(DEPDIR)/libshadow_la-spawn.Plo \
+	./$(DEPDIR)/libshadow_la-sssd.Plo \
+	./$(DEPDIR)/libshadow_la-subordinateio.Plo \
+	./$(DEPDIR)/libshadow_la-tcbfuncs.Plo \
+	./$(DEPDIR)/libshadow_la-utent.Plo
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+	-I$(top_srcdir)
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+	exitcodes.h faillog.h fields.c fputsx.c getdef.c getdef.h \
+	get_gid.c getlong.c get_pid.c get_uid.c getulong.c groupio.c \
+	groupmem.c groupio.h gshadow.c lockpw.c nss.c nscd.c nscd.h \
+	shadowlog.c shadowlog.h shadowlog_internal.h sssd.c sssd.h \
+	pam_defs.h port.c port.h prototypes.h pwauth.c pwauth.h pwio.c \
+	pwio.h pwmem.c run_part.h run_part.c subordinateio.h \
+	subordinateio.c selinux.c semanage.c sgetgrent.c sgetpwent.c \
+	sgetspent.c sgroupio.c sgroupio.h shadow.c shadowio.c \
+	shadowio.h shadowmem.c spawn.c utent.c $(am__append_2)
+
+# These files are unneeded for some reason, listed in
+# order of appearance:
+#
+# sources for dbm support (not yet used)
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+	.indent.pro \
+	gshadow_.h
+
+all: all-am
+
+.SUFFIXES:
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+	-rm -f ./$(DEPDIR)/libshadow_la-shadowlog.Plo
+	-rm -f ./$(DEPDIR)/libshadow_la-shadowmem.Plo
+	-rm -f ./$(DEPDIR)/libshadow_la-spawn.Plo
+	-rm -f ./$(DEPDIR)/libshadow_la-sssd.Plo
+	-rm -f ./$(DEPDIR)/libshadow_la-subordinateio.Plo
+	-rm -f ./$(DEPDIR)/libshadow_la-tcbfuncs.Plo
+	-rm -f ./$(DEPDIR)/libshadow_la-utent.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/lib/commonio.c b/lib/commonio.c
new file mode 100644
index 0000000..9a02ce1
--- /dev/null
+++ b/lib/commonio.c
@@ -0,0 +1,1276 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2001, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2011, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include "defines.h"
+#include <assert.h>
+#include <sys/stat.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <utime.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <signal.h>
+#include "nscd.h"
+#include "sssd.h"
+#ifdef WITH_TCB
+#include <tcb.h>
+#endif				/* WITH_TCB */
+#include "prototypes.h"
+#include "commonio.h"
+#include "shadowlog_internal.h"
+
+/* local function prototypes */
+static int lrename (const char *, const char *);
+static int check_link_count (const char *file, bool log);
+static int do_lock_file (const char *file, const char *lock, bool log);
+static /*@null@*/ /*@dependent@*/FILE *fopen_set_perms (
+	const char *name,
+	const char *mode,
+	const struct stat *sb);
+static int create_backup (const char *, FILE *);
+static void free_linked_list (struct commonio_db *);
+static void add_one_entry (
+	struct commonio_db *db,
+	/*@owned@*/struct commonio_entry *p);
+static bool name_is_nis (const char *name);
+static int write_all (const struct commonio_db *);
+static /*@dependent@*/ /*@null@*/struct commonio_entry *find_entry_by_name (
+	struct commonio_db *,
+	const char *);
+static /*@dependent@*/ /*@null@*/struct commonio_entry *next_entry_by_name (
+	struct commonio_db *,
+	/*@null@*/struct commonio_entry *pos,
+	const char *);
+
+static int lock_count = 0;
+static bool nscd_need_reload = false;
+
+/*
+ * Simple rename(P) alternative that attempts to rename to symlink
+ * target.
+ */
+int lrename (const char *old, const char *new)
+{
+	int res;
+	char *r = NULL;
+
+#ifndef __GLIBC__
+	char resolved_path[PATH_MAX];
+#endif				/* !__GLIBC__ */
+	struct stat sb;
+	if (lstat (new, &sb) == 0 && S_ISLNK (sb.st_mode)) {
+#ifdef __GLIBC__ /* now a POSIX.1-2008 feature */
+		r = realpath (new, NULL);
+#else				/* !__GLIBC__ */
+		r = realpath (new, resolved_path);
+#endif				/* !__GLIBC__ */
+		if (NULL == r) {
+			perror ("realpath in lrename()");
+		} else {
+			new = r;
+		}
+	}
+
+	res = rename (old, new);
+
+#ifdef __GLIBC__
+	free (r);
+#endif				/* __GLIBC__ */
+
+	return res;
+}
+
+static int check_link_count (const char *file, bool log)
+{
+	struct stat sb;
+
+	if (stat (file, &sb) != 0) {
+		if (log) {
+			(void) fprintf (shadow_logfd,
+			                "%s: %s file stat error: %s\n",
+			                shadow_progname, file, strerror (errno));
+		}
+		return 0;
+	}
+
+	if (sb.st_nlink != 2) {
+		if (log) {
+			(void) fprintf (shadow_logfd,
+			                "%s: %s: lock file already used (nlink: %u)\n",
+			                shadow_progname, file, sb.st_nlink);
+		}
+		return 0;
+	}
+
+	return 1;
+}
+
+
+static int do_lock_file (const char *file, const char *lock, bool log)
+{
+	int fd;
+	pid_t pid;
+	ssize_t len;
+	int retval;
+	char buf[32];
+
+	fd = open (file, O_CREAT | O_TRUNC | O_WRONLY, 0600);
+	if (-1 == fd) {
+		if (log) {
+			(void) fprintf (shadow_logfd,
+			                "%s: %s: %s\n",
+			                shadow_progname, file, strerror (errno));
+		}
+		return 0;
+	}
+
+	pid = getpid ();
+	snprintf (buf, sizeof buf, "%lu", (unsigned long) pid);
+	len = (ssize_t) strlen (buf) + 1;
+	if (write (fd, buf, (size_t) len) != len) {
+		if (log) {
+			(void) fprintf (shadow_logfd,
+			                "%s: %s file write error: %s\n",
+			                shadow_progname, file, strerror (errno));
+		}
+		(void) close (fd);
+		unlink (file);
+		return 0;
+	}
+	if (fdatasync (fd) == -1) {
+		if (log) {
+			(void) fprintf (shadow_logfd,
+			                "%s: %s file sync error: %s\n",
+			                shadow_progname, file, strerror (errno));
+		}
+		(void) close (fd);
+		unlink (file);
+		return 0;
+	}
+	close (fd);
+
+	if (link (file, lock) == 0) {
+		retval = check_link_count (file, log);
+		unlink (file);
+		return retval;
+	}
+
+	fd = open (lock, O_RDWR);
+	if (-1 == fd) {
+		if (log) {
+			(void) fprintf (shadow_logfd,
+			                "%s: %s: %s\n",
+			                shadow_progname, lock, strerror (errno));
+		}
+		unlink (file);
+		errno = EINVAL;
+		return 0;
+	}
+	len = read (fd, buf, sizeof (buf) - 1);
+	close (fd);
+	if (len <= 0) {
+		if (log) {
+			(void) fprintf (shadow_logfd,
+			                "%s: existing lock file %s without a PID\n",
+			                shadow_progname, lock);
+		}
+		unlink (file);
+		errno = EINVAL;
+		return 0;
+	}
+	buf[len] = '\0';
+	if (get_pid (buf, &pid) == 0) {
+		if (log) {
+			(void) fprintf (shadow_logfd,
+			                "%s: existing lock file %s with an invalid PID '%s'\n",
+			                shadow_progname, lock, buf);
+		}
+		unlink (file);
+		errno = EINVAL;
+		return 0;
+	}
+	if (kill (pid, 0) == 0) {
+		if (log) {
+			(void) fprintf (shadow_logfd,
+			                "%s: lock %s already used by PID %lu\n",
+			                shadow_progname, lock, (unsigned long) pid);
+		}
+		unlink (file);
+		errno = EEXIST;
+		return 0;
+	}
+	if (unlink (lock) != 0) {
+		if (log) {
+			(void) fprintf (shadow_logfd,
+			                "%s: cannot get lock %s: %s\n",
+			                shadow_progname, lock, strerror (errno));
+		}
+		unlink (file);
+		return 0;
+	}
+
+	retval = 0;
+	if (link (file, lock) == 0) {
+		retval = check_link_count (file, log);
+	} else {
+		if (log) {
+			(void) fprintf (shadow_logfd,
+			                "%s: cannot get lock %s: %s\n",
+			                shadow_progname, lock, strerror (errno));
+		}
+	}
+
+	unlink (file);
+	return retval;
+}
+
+
+static /*@null@*/ /*@dependent@*/FILE *fopen_set_perms (
+	const char *name,
+	const char *mode,
+	const struct stat *sb)
+{
+	FILE *fp;
+	mode_t mask;
+
+	mask = umask (0777);
+	fp = fopen (name, mode);
+	(void) umask (mask);
+	if (NULL == fp) {
+		return NULL;
+	}
+
+#ifdef HAVE_FCHOWN
+	if (fchown (fileno (fp), sb->st_uid, sb->st_gid) != 0) {
+		goto fail;
+	}
+#else				/* !HAVE_FCHOWN */
+	if (chown (name, sb->st_mode) != 0) {
+		goto fail;
+	}
+#endif				/* !HAVE_FCHOWN */
+
+#ifdef HAVE_FCHMOD
+	if (fchmod (fileno (fp), sb->st_mode & 0664) != 0) {
+		goto fail;
+	}
+#else				/* !HAVE_FCHMOD */
+	if (chmod (name, sb->st_mode & 0664) != 0) {
+		goto fail;
+	}
+#endif				/* !HAVE_FCHMOD */
+	return fp;
+
+      fail:
+	(void) fclose (fp);
+	/* fopen_set_perms is used for intermediate files */
+	(void) unlink (name);
+	return NULL;
+}
+
+
+static int create_backup (const char *backup, FILE * fp)
+{
+	struct stat sb;
+	struct utimbuf ub;
+	FILE *bkfp;
+	int c;
+
+	if (fstat (fileno (fp), &sb) != 0) {
+		return -1;
+	}
+
+	bkfp = fopen_set_perms (backup, "w", &sb);
+	if (NULL == bkfp) {
+		return -1;
+	}
+
+	/* TODO: faster copy, not one-char-at-a-time.  --marekm */
+	c = 0;
+	if (fseek (fp, 0, SEEK_SET) == 0) {
+		while ((c = getc (fp)) != EOF) {
+			if (putc (c, bkfp) == EOF) {
+				break;
+			}
+		}
+	}
+	if ((c != EOF) || (ferror (fp) != 0) || (fflush (bkfp) != 0)) {
+		(void) fclose (bkfp);
+		/* FIXME: unlink the backup file? */
+		return -1;
+	}
+	if (fsync (fileno (bkfp)) != 0) {
+		(void) fclose (bkfp);
+		/* FIXME: unlink the backup file? */
+		return -1;
+	}
+	if (fclose (bkfp) != 0) {
+		/* FIXME: unlink the backup file? */
+		return -1;
+	}
+
+	ub.actime = sb.st_atime;
+	ub.modtime = sb.st_mtime;
+	(void) utime (backup, &ub);
+	return 0;
+}
+
+
+static void free_linked_list (struct commonio_db *db)
+{
+	struct commonio_entry *p;
+
+	while (NULL != db->head) {
+		p = db->head;
+		db->head = p->next;
+
+		free (p->line);
+
+		if (NULL != p->eptr) {
+			db->ops->free (p->eptr);
+		}
+
+		free (p);
+	}
+	db->tail = NULL;
+}
+
+
+int commonio_setname (struct commonio_db *db, const char *name)
+{
+	snprintf (db->filename, sizeof (db->filename), "%s", name);
+	db->setname = true;
+	return 1;
+}
+
+
+bool commonio_present (const struct commonio_db *db)
+{
+	return (access (db->filename, F_OK) == 0);
+}
+
+
+int commonio_lock_nowait (struct commonio_db *db, bool log)
+{
+	char* file = NULL;
+	char* lock = NULL;
+	size_t lock_file_len;
+	size_t file_len;
+	int err = 0;
+
+	if (db->locked) {
+		return 1;
+	}
+	file_len = strlen(db->filename) + 11;/* %lu max size */
+	lock_file_len = strlen(db->filename) + 6; /* sizeof ".lock" */
+	file = (char*)malloc(file_len);
+	if (file == NULL) {
+		goto cleanup_ENOMEM;
+	}
+	lock = (char*)malloc(lock_file_len);
+	if (lock == NULL) {
+		goto cleanup_ENOMEM;
+	}
+	snprintf (file, file_len, "%s.%lu",
+	          db->filename, (unsigned long) getpid ());
+	snprintf (lock, lock_file_len, "%s.lock", db->filename);
+	if (do_lock_file (file, lock, log) != 0) {
+		db->locked = true;
+		lock_count++;
+		err = 1;
+	}
+cleanup_ENOMEM:
+	free(file);
+	free(lock);
+	return err;
+}
+
+
+int commonio_lock (struct commonio_db *db)
+{
+	int i;
+
+#ifdef HAVE_LCKPWDF
+	/*
+	 * Only if the system libc has a real lckpwdf() - the one from
+	 * lockpw.c calls us and would cause infinite recursion!
+	 * It is also not used with the prefix option.
+	 */
+	if (!db->setname) {
+		/*
+		 * Call lckpwdf() on the first lock.
+		 * If it succeeds, call *_lock() only once
+		 * (no retries, it should always succeed).
+		 */
+		if (0 == lock_count) {
+			if (lckpwdf () == -1) {
+				if (geteuid () != 0) {
+					(void) fprintf (shadow_logfd,
+					                "%s: Permission denied.\n",
+					                shadow_progname);
+				}
+				return 0;	/* failure */
+			}
+		}
+
+		if (commonio_lock_nowait (db, true) != 0) {
+			return 1;	/* success */
+		}
+
+		ulckpwdf ();
+		return 0;		/* failure */
+	}
+#endif				/* !HAVE_LCKPWDF */
+
+	/*
+	 * lckpwdf() not used - do it the old way.
+	 */
+#ifndef LOCK_TRIES
+#define LOCK_TRIES 15
+#endif
+
+#ifndef LOCK_SLEEP
+#define LOCK_SLEEP 1
+#endif
+	for (i = 0; i < LOCK_TRIES; i++) {
+		if (i > 0) {
+			sleep (LOCK_SLEEP);	/* delay between retries */
+		}
+		if (commonio_lock_nowait (db, i==LOCK_TRIES-1) != 0) {
+			return 1;	/* success */
+		}
+		/* no unnecessary retries on "permission denied" errors */
+		if (geteuid () != 0) {
+			(void) fprintf (shadow_logfd, "%s: Permission denied.\n",
+			                shadow_progname);
+			return 0;
+		}
+	}
+	return 0;		/* failure */
+}
+
+static void dec_lock_count (void)
+{
+	if (lock_count > 0) {
+		lock_count--;
+		if (lock_count == 0) {
+			/* Tell nscd when lock count goes to zero,
+			   if any of the files were changed.  */
+			if (nscd_need_reload) {
+				nscd_flush_cache ("passwd");
+				nscd_flush_cache ("group");
+				sssd_flush_cache (SSSD_DB_PASSWD | SSSD_DB_GROUP);
+				nscd_need_reload = false;
+			}
+#ifdef HAVE_LCKPWDF
+			ulckpwdf ();
+#endif				/* HAVE_LCKPWDF */
+		}
+	}
+}
+
+
+int commonio_unlock (struct commonio_db *db)
+{
+	char lock[1024];
+
+	if (db->isopen) {
+		db->readonly = true;
+		if (commonio_close (db) == 0) {
+			if (db->locked) {
+				dec_lock_count ();
+			}
+			return 0;
+		}
+	}
+	if (db->locked) {
+		/*
+		 * Unlock in reverse order: remove the lock file,
+		 * then call ulckpwdf() (if used) on last unlock.
+		 */
+		db->locked = false;
+		snprintf (lock, sizeof lock, "%s.lock", db->filename);
+		unlink (lock);
+		dec_lock_count ();
+		return 1;
+	}
+	return 0;
+}
+
+
+/*
+ * Add an entry at the end.
+ *
+ * defines p->next, p->prev
+ * (unfortunately, owned special are not supported)
+ */
+static void add_one_entry (struct commonio_db *db,
+                           /*@owned@*/struct commonio_entry *p)
+{
+	/*@-mustfreeonly@*/
+	p->next = NULL;
+	p->prev = db->tail;
+	/*@=mustfreeonly@*/
+	if (NULL == db->head) {
+		db->head = p;
+	}
+	if (NULL != db->tail) {
+		db->tail->next = p;
+	}
+	db->tail = p;
+}
+
+
+static bool name_is_nis (const char *name)
+{
+	return (('+' == name[0]) || ('-' == name[0]));
+}
+
+
+/*
+ * New entries are inserted before the first NIS entry.  Order is preserved
+ * when db is written out.
+ */
+#ifndef KEEP_NIS_AT_END
+#define KEEP_NIS_AT_END 1
+#endif
+
+#if KEEP_NIS_AT_END
+static void add_one_entry_nis (struct commonio_db *db,
+                               /*@owned@*/struct commonio_entry *newp);
+
+/*
+ * Insert an entry between the regular entries, and the NIS entries.
+ *
+ * defines newp->next, newp->prev
+ * (unfortunately, owned special are not supported)
+ */
+static void add_one_entry_nis (struct commonio_db *db,
+                               /*@owned@*/struct commonio_entry *newp)
+{
+	struct commonio_entry *p;
+
+	for (p = db->head; NULL != p; p = p->next) {
+		if (name_is_nis (p->eptr ? db->ops->getname (p->eptr)
+		                         : p->line)) {
+			/*@-mustfreeonly@*/
+			newp->next = p;
+			newp->prev = p->prev;
+			/*@=mustfreeonly@*/
+			if (NULL != p->prev) {
+				p->prev->next = newp;
+			} else {
+				db->head = newp;
+			}
+			p->prev = newp;
+			return;
+		}
+	}
+	add_one_entry (db, newp);
+}
+#endif				/* KEEP_NIS_AT_END */
+
+/* Initial buffer size, as well as increment if not sufficient
+   (for reading very long lines in group files).  */
+#define BUFLEN 4096
+
+int commonio_open (struct commonio_db *db, int mode)
+{
+	char *buf;
+	char *cp;
+	char *line;
+	struct commonio_entry *p;
+	void *eptr = NULL;
+	int flags = mode;
+	size_t buflen;
+	int fd;
+	int saved_errno;
+
+	mode &= ~O_CREAT;
+
+	if (   db->isopen
+	    || (   (O_RDONLY != mode)
+	        && (O_RDWR != mode))) {
+		errno = EINVAL;
+		return 0;
+	}
+	db->readonly = (mode == O_RDONLY);
+	if (!db->readonly && !db->locked) {
+		errno = EACCES;
+		return 0;
+	}
+
+	db->head = NULL;
+	db->tail = NULL;
+	db->cursor = NULL;
+	db->changed = false;
+
+	fd = open (db->filename,
+	             (db->readonly ? O_RDONLY : O_RDWR)
+	           | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW);
+	saved_errno = errno;
+	db->fp = NULL;
+	if (fd >= 0) {
+#ifdef WITH_TCB
+		if (tcb_is_suspect (fd) != 0) {
+			(void) close (fd);
+			errno = EINVAL;
+			return 0;
+		}
+#endif				/* WITH_TCB */
+		db->fp = fdopen (fd, db->readonly ? "r" : "r+");
+		saved_errno = errno;
+		if (NULL == db->fp) {
+			(void) close (fd);
+		}
+	}
+	errno = saved_errno;
+
+	/*
+	 * If O_CREAT was specified and the file didn't exist, it will be
+	 * created by commonio_close().  We have no entries to read yet.  --marekm
+	 */
+	if (NULL == db->fp) {
+		if (((flags & O_CREAT) != 0) && (ENOENT == errno)) {
+			db->isopen = true;
+			return 1;
+		}
+		return 0;
+	}
+
+	/* Do not inherit fd in spawned processes (e.g. nscd) */
+	fcntl (fileno (db->fp), F_SETFD, FD_CLOEXEC);
+
+	buflen = BUFLEN;
+	buf = (char *) malloc (buflen);
+	if (NULL == buf) {
+		goto cleanup_ENOMEM;
+	}
+
+	while (db->ops->fgets (buf, (int) buflen, db->fp) == buf) {
+		while (   ((cp = strrchr (buf, '\n')) == NULL)
+		       && (feof (db->fp) == 0)) {
+			size_t len;
+
+			buflen += BUFLEN;
+			cp = (char *) realloc (buf, buflen);
+			if (NULL == cp) {
+				goto cleanup_buf;
+			}
+			buf = cp;
+			len = strlen (buf);
+			if (db->ops->fgets (buf + len,
+			                    (int) (buflen - len),
+			                    db->fp) == NULL) {
+				goto cleanup_buf;
+			}
+		}
+		cp = strrchr (buf, '\n');
+		if (NULL != cp) {
+			*cp = '\0';
+		}
+
+		line = strdup (buf);
+		if (NULL == line) {
+			goto cleanup_buf;
+		}
+
+		if (name_is_nis (line)) {
+			eptr = NULL;
+		} else {
+			eptr = db->ops->parse (line);
+			if (NULL != eptr) {
+				eptr = db->ops->dup (eptr);
+				if (NULL == eptr) {
+					goto cleanup_line;
+				}
+			}
+		}
+
+		p = (struct commonio_entry *) malloc (sizeof *p);
+		if (NULL == p) {
+			goto cleanup_entry;
+		}
+
+		p->eptr = eptr;
+		p->line = line;
+		p->changed = false;
+
+		add_one_entry (db, p);
+	}
+
+	free (buf);
+
+	if (ferror (db->fp) != 0) {
+		goto cleanup_errno;
+	}
+
+	if ((NULL != db->ops->open_hook) && (db->ops->open_hook () == 0)) {
+		goto cleanup_errno;
+	}
+
+	db->isopen = true;
+	return 1;
+
+      cleanup_entry:
+	if (NULL != eptr) {
+		db->ops->free (eptr);
+	}
+      cleanup_line:
+	free (line);
+      cleanup_buf:
+	free (buf);
+      cleanup_ENOMEM:
+	errno = ENOMEM;
+      cleanup_errno:
+	saved_errno = errno;
+	free_linked_list (db);
+	fclose (db->fp);
+	db->fp = NULL;
+	errno = saved_errno;
+	return 0;
+}
+
+/*
+ * Sort given db according to cmp function (usually compares uids)
+ */
+int
+commonio_sort (struct commonio_db *db, int (*cmp) (const void *, const void *))
+{
+	struct commonio_entry **entries, *ptr;
+	size_t n = 0, i;
+#if KEEP_NIS_AT_END
+	struct commonio_entry *nis = NULL;
+#endif
+
+	for (ptr = db->head;
+	        (NULL != ptr)
+#if KEEP_NIS_AT_END
+	     && ((NULL == ptr->line)
+	         || (('+' != ptr->line[0])
+	             && ('-' != ptr->line[0])))
+#endif
+	     ;
+	     ptr = ptr->next) {
+		n++;
+	}
+#if KEEP_NIS_AT_END
+	if (NULL != ptr) {
+		nis = ptr;
+	}
+#endif
+
+	if (n <= 1) {
+		return 0;
+	}
+
+	entries = malloc (n * sizeof (struct commonio_entry *));
+	if (entries == NULL) {
+		return -1;
+	}
+
+	n = 0;
+	for (ptr = db->head;
+#if KEEP_NIS_AT_END
+	     nis != ptr;
+#else
+	     NULL != ptr;
+#endif
+/*@ -nullderef @*/
+	     ptr = ptr->next
+/*@ +nullderef @*/
+	    ) {
+		entries[n] = ptr;
+		n++;
+	}
+	qsort (entries, n, sizeof (struct commonio_entry *), cmp);
+
+	/* Take care of the head and tail separately */
+	db->head = entries[0];
+	n--;
+#if KEEP_NIS_AT_END
+	if (NULL == nis)
+#endif
+	{
+		db->tail = entries[n];
+	}
+	db->head->prev = NULL;
+	db->head->next = entries[1];
+	entries[n]->prev = entries[n - 1];
+#if KEEP_NIS_AT_END
+	entries[n]->next = nis;
+#else
+	entries[n]->next = NULL;
+#endif
+
+	/* Now other elements have prev and next entries */
+	for (i = 1; i < n; i++) {
+		entries[i]->prev = entries[i - 1];
+		entries[i]->next = entries[i + 1];
+	}
+
+	free (entries);
+	db->changed = true;
+
+	return 0;
+}
+
+/*
+ * Sort entries in db according to order in another.
+ */
+int commonio_sort_wrt (struct commonio_db *shadow,
+                       const struct commonio_db *passwd)
+{
+	struct commonio_entry *head = NULL, *pw_ptr, *spw_ptr;
+	const char *name;
+
+	if ((NULL == shadow) || (NULL == shadow->head)) {
+		return 0;
+	}
+
+	for (pw_ptr = passwd->head; NULL != pw_ptr; pw_ptr = pw_ptr->next) {
+		if (NULL == pw_ptr->eptr) {
+			continue;
+		}
+		name = passwd->ops->getname (pw_ptr->eptr);
+		for (spw_ptr = shadow->head;
+		     NULL != spw_ptr;
+		     spw_ptr = spw_ptr->next) {
+			if (NULL == spw_ptr->eptr) {
+				continue;
+			}
+			if (strcmp (name, shadow->ops->getname (spw_ptr->eptr))
+			    == 0) {
+				break;
+			}
+		}
+		if (NULL == spw_ptr) {
+			continue;
+		}
+		commonio_del_entry (shadow, spw_ptr);
+		spw_ptr->next = head;
+		head = spw_ptr;
+	}
+
+	for (spw_ptr = head; NULL != spw_ptr; spw_ptr = head) {
+		head = head->next;
+
+		if (NULL != shadow->head) {
+			shadow->head->prev = spw_ptr;
+		}
+		spw_ptr->next = shadow->head;
+		shadow->head = spw_ptr;
+	}
+
+	shadow->head->prev = NULL;
+	shadow->changed = true;
+
+	return 0;
+}
+
+/*
+ * write_all - Write the database to its file.
+ *
+ * It returns 0 if all the entries could be written correctly.
+ */
+static int write_all (const struct commonio_db *db)
+	/*@requires notnull db->fp@*/
+{
+	const struct commonio_entry *p;
+	void *eptr;
+
+	for (p = db->head; NULL != p; p = p->next) {
+		if (p->changed) {
+			eptr = p->eptr;
+			assert (NULL != eptr);
+			if (db->ops->put (eptr, db->fp) != 0) {
+				return -1;
+			}
+		} else if (NULL != p->line) {
+			if (db->ops->fputs (p->line, db->fp) == EOF) {
+				return -1;
+			}
+			if (putc ('\n', db->fp) == EOF) {
+				return -1;
+			}
+		}
+	}
+	return 0;
+}
+
+
+int commonio_close (struct commonio_db *db)
+{
+	char buf[1024];
+	int errors = 0;
+	struct stat sb;
+
+	if (!db->isopen) {
+		errno = EINVAL;
+		return 0;
+	}
+	db->isopen = false;
+
+	if (!db->changed || db->readonly) {
+		if (NULL != db->fp) {
+			(void) fclose (db->fp);
+			db->fp = NULL;
+		}
+		goto success;
+	}
+
+	if ((NULL != db->ops->close_hook) && (db->ops->close_hook () == 0)) {
+		goto fail;
+	}
+
+	memzero (&sb, sizeof sb);
+	if (NULL != db->fp) {
+		if (fstat (fileno (db->fp), &sb) != 0) {
+			(void) fclose (db->fp);
+			db->fp = NULL;
+			goto fail;
+		}
+
+		/*
+		 * Create backup file.
+		 */
+		snprintf (buf, sizeof buf, "%s-", db->filename);
+
+#ifdef WITH_SELINUX
+		if (set_selinux_file_context (db->filename, S_IFREG) != 0) {
+			errors++;
+		}
+#endif
+		if (create_backup (buf, db->fp) != 0) {
+			errors++;
+		}
+
+		if (fclose (db->fp) != 0) {
+			errors++;
+		}
+
+#ifdef WITH_SELINUX
+		if (reset_selinux_file_context () != 0) {
+			errors++;
+		}
+#endif
+		if (errors != 0) {
+			db->fp = NULL;
+			goto fail;
+		}
+	} else {
+		/*
+		 * Default permissions for new [g]shadow files.
+		 */
+		sb.st_mode = db->st_mode;
+		sb.st_uid = db->st_uid;
+		sb.st_gid = db->st_gid;
+	}
+
+	snprintf (buf, sizeof buf, "%s+", db->filename);
+
+#ifdef WITH_SELINUX
+	if (set_selinux_file_context (db->filename, S_IFREG) != 0) {
+		errors++;
+	}
+#endif
+
+	db->fp = fopen_set_perms (buf, "w", &sb);
+	if (NULL == db->fp) {
+		goto fail;
+	}
+
+	if (write_all (db) != 0) {
+		errors++;
+	}
+
+	if (fflush (db->fp) != 0) {
+		errors++;
+	}
+#ifdef HAVE_FSYNC
+	if (fsync (fileno (db->fp)) != 0) {
+		errors++;
+	}
+#else				/* !HAVE_FSYNC */
+	sync ();
+#endif				/* !HAVE_FSYNC */
+	if (fclose (db->fp) != 0) {
+		errors++;
+	}
+
+	db->fp = NULL;
+
+	if (errors != 0) {
+		unlink (buf);
+		goto fail;
+	}
+
+	if (lrename (buf, db->filename) != 0) {
+		goto fail;
+	}
+
+#ifdef WITH_SELINUX
+	if (reset_selinux_file_context () != 0) {
+		goto fail;
+	}
+#endif
+
+	nscd_need_reload = true;
+	goto success;
+      fail:
+	errors++;
+      success:
+
+	free_linked_list (db);
+	return errors == 0;
+}
+
+static /*@dependent@*/ /*@null@*/struct commonio_entry *next_entry_by_name (
+	struct commonio_db *db,
+	/*@null@*/struct commonio_entry *pos,
+	const char *name)
+{
+	struct commonio_entry *p;
+	void *ep;
+
+	if (NULL == pos) {
+		return NULL;
+	}
+
+	for (p = pos; NULL != p; p = p->next) {
+		ep = p->eptr;
+		if (   (NULL != ep)
+		    && (strcmp (db->ops->getname (ep), name) == 0)) {
+			break;
+		}
+	}
+	return p;
+}
+
+static /*@dependent@*/ /*@null@*/struct commonio_entry *find_entry_by_name (
+	struct commonio_db *db,
+	const char *name)
+{
+	return next_entry_by_name (db, db->head, name);
+}
+
+
+int commonio_update (struct commonio_db *db, const void *eptr)
+{
+	struct commonio_entry *p;
+	void *nentry;
+
+	if (!db->isopen || db->readonly) {
+		errno = EINVAL;
+		return 0;
+	}
+	nentry = db->ops->dup (eptr);
+	if (NULL == nentry) {
+		errno = ENOMEM;
+		return 0;
+	}
+	p = find_entry_by_name (db, db->ops->getname (eptr));
+	if (NULL != p) {
+		if (next_entry_by_name (db, p->next, db->ops->getname (eptr)) != NULL) {
+			fprintf (shadow_logfd, _("Multiple entries named '%s' in %s. Please fix this with pwck or grpck.\n"), db->ops->getname (eptr), db->filename);
+			db->ops->free (nentry);
+			return 0;
+		}
+		db->ops->free (p->eptr);
+		p->eptr = nentry;
+		p->changed = true;
+		db->cursor = p;
+
+		db->changed = true;
+		return 1;
+	}
+	/* not found, new entry */
+	p = (struct commonio_entry *) malloc (sizeof *p);
+	if (NULL == p) {
+		db->ops->free (nentry);
+		errno = ENOMEM;
+		return 0;
+	}
+
+	p->eptr = nentry;
+	p->line = NULL;
+	p->changed = true;
+
+#if KEEP_NIS_AT_END
+	add_one_entry_nis (db, p);
+#else				/* !KEEP_NIS_AT_END */
+	add_one_entry (db, p);
+#endif				/* !KEEP_NIS_AT_END */
+
+	db->changed = true;
+	return 1;
+}
+
+#ifdef ENABLE_SUBIDS
+int commonio_append (struct commonio_db *db, const void *eptr)
+{
+	struct commonio_entry *p;
+	void *nentry;
+
+	if (!db->isopen || db->readonly) {
+		errno = EINVAL;
+		return 0;
+	}
+	nentry = db->ops->dup (eptr);
+	if (NULL == nentry) {
+		errno = ENOMEM;
+		return 0;
+	}
+	/* new entry */
+	p = (struct commonio_entry *) malloc (sizeof *p);
+	if (NULL == p) {
+		db->ops->free (nentry);
+		errno = ENOMEM;
+		return 0;
+	}
+
+	p->eptr = nentry;
+	p->line = NULL;
+	p->changed = true;
+	add_one_entry (db, p);
+
+	db->changed = true;
+	return 1;
+}
+#endif				/* ENABLE_SUBIDS */
+
+void commonio_del_entry (struct commonio_db *db, const struct commonio_entry *p)
+{
+	if (p == db->cursor) {
+		db->cursor = p->next;
+	}
+
+	if (NULL != p->prev) {
+		p->prev->next = p->next;
+	} else {
+		db->head = p->next;
+	}
+
+	if (NULL != p->next) {
+		p->next->prev = p->prev;
+	} else {
+		db->tail = p->prev;
+	}
+
+	db->changed = true;
+}
+
+/*
+ * commonio_remove - Remove the entry of the given name from the database.
+ */
+int commonio_remove (struct commonio_db *db, const char *name)
+{
+	struct commonio_entry *p;
+
+	if (!db->isopen || db->readonly) {
+		errno = EINVAL;
+		return 0;
+	}
+	p = find_entry_by_name (db, name);
+	if (NULL == p) {
+		errno = ENOENT;
+		return 0;
+	}
+	if (next_entry_by_name (db, p->next, name) != NULL) {
+		fprintf (shadow_logfd, _("Multiple entries named '%s' in %s. Please fix this with pwck or grpck.\n"), name, db->filename);
+		return 0;
+	}
+
+	commonio_del_entry (db, p);
+
+	free (p->line);
+
+	if (NULL != p->eptr) {
+		db->ops->free (p->eptr);
+	}
+
+	return 1;
+}
+
+/*
+ * commonio_locate - Find the first entry with the specified name in
+ *                   the database.
+ *
+ *	If found, it returns the entry and set the cursor of the database to
+ *	that entry.
+ *
+ *	Otherwise, it returns NULL.
+ */
+/*@observer@*/ /*@null@*/const void *commonio_locate (struct commonio_db *db, const char *name)
+{
+	struct commonio_entry *p;
+
+	if (!db->isopen) {
+		errno = EINVAL;
+		return NULL;
+	}
+	p = find_entry_by_name (db, name);
+	if (NULL == p) {
+		errno = ENOENT;
+		return NULL;
+	}
+	db->cursor = p;
+	return p->eptr;
+}
+
+/*
+ * commonio_rewind - Restore the database cursor to the first entry.
+ *
+ * It returns 0 on error, 1 on success.
+ */
+int commonio_rewind (struct commonio_db *db)
+{
+	if (!db->isopen) {
+		errno = EINVAL;
+		return 0;
+	}
+	db->cursor = NULL;
+	return 1;
+}
+
+/*
+ * commonio_next - Return the next entry of the specified database
+ *
+ * It returns the next entry, or NULL if no other entries could be found.
+ */
+/*@observer@*/ /*@null@*/const void *commonio_next (struct commonio_db *db)
+{
+	void *eptr;
+
+	if (!db->isopen) {
+		errno = EINVAL;
+		return 0;
+	}
+	if (NULL == db->cursor) {
+		db->cursor = db->head;
+	} else {
+		db->cursor = db->cursor->next;
+	}
+
+	while (NULL != db->cursor) {
+		eptr = db->cursor->eptr;
+		if (NULL != eptr) {
+			return eptr;
+		}
+
+		db->cursor = db->cursor->next;
+	}
+	return NULL;
+}
+
diff --git a/lib/commonio.h b/lib/commonio.h
new file mode 100644
index 0000000..e63c5b4
--- /dev/null
+++ b/lib/commonio.h
@@ -0,0 +1,144 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2010, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/* $Id$ */
+#ifndef COMMONIO_H
+#define COMMONIO_H
+
+#include "defines.h" /* bool */
+
+/*
+ * Linked list entry.
+ */
+struct commonio_entry {
+	/*@null@*/char *line;
+	/*@null@*/void *eptr;		/* struct passwd, struct spwd, ... */
+	/*@dependent@*/ /*@null@*/struct commonio_entry *prev;
+	/*@owned@*/ /*@null@*/struct commonio_entry *next;
+	bool changed:1;
+};
+
+/*
+ * Operations depending on database type: passwd, group, shadow etc.
+ */
+struct commonio_ops {
+	/*
+	 * Make a copy of the object (for example, struct passwd)
+	 * and all strings pointed by it, in malloced memory.
+	 */
+	/*@null@*/ /*@only@*/void *(*dup) (const void *);
+
+	/*
+	 * free() the object including any strings pointed by it.
+	 */
+	void (*free) (/*@out@*/ /*@only@*/void *);
+
+	/*
+	 * Return the name of the object (for example, pw_name
+	 * for struct passwd).
+	 */
+	const char *(*getname) (const void *);
+
+	/*
+	 * Parse a string, return object (in static area -
+	 * should be copied using the dup operation above).
+	 */
+	void *(*parse) (const char *);
+
+	/*
+	 * Write the object to the file (this calls putpwent()
+	 * for struct passwd, for example).
+	 */
+	int (*put) (const void *, FILE *);
+
+	/*
+	 * fgets and fputs (can be replaced by versions that
+	 * understand line continuation conventions).
+	 */
+	/*@null@*/char *(*fgets) (/*@returned@*/ /*@out@*/char *s, int n, FILE *stream);
+	int (*fputs) (const char *, FILE *);
+
+	/*
+	 * open_hook and close_hook.
+	 * If non NULL, these functions will be called after the database
+	 * is open or before it is closed.
+	 * They return 0 on failure and 1 on success.
+	 */
+	/*@null@*/int (*open_hook) (void);
+	/*@null@*/int (*close_hook) (void);
+};
+
+/*
+ * Database structure.
+ */
+struct commonio_db {
+	/*
+	 * Name of the data file.
+	 */
+	char filename[1024];
+
+	/*
+	 * Operations from above.
+	 */
+	/*@observer@*/const struct commonio_ops *ops;
+
+	/*
+	 * Currently open file stream.
+	 */
+	/*@dependent@*/ /*@null@*/FILE *fp;
+
+#ifdef WITH_SELINUX
+	/*@null@*/char *scontext;
+#endif
+	/*
+	 * Default permissions and owner for newly created data file.
+         */
+	mode_t st_mode;
+	uid_t st_uid;
+	gid_t st_gid;
+	/*
+	 * Head, tail, current position in linked list.
+	 */
+	/*@owned@*/ /*@null@*/struct commonio_entry *head;
+	/*@dependent@*/ /*@null@*/struct commonio_entry *tail;
+	/*@dependent@*/ /*@null@*/struct commonio_entry *cursor;
+
+	/*
+	 * Various flags.
+	 */
+	bool changed:1;
+	bool isopen:1;
+	bool locked:1;
+	bool readonly:1;
+	bool setname:1;
+};
+
+extern int commonio_setname (struct commonio_db *, const char *);
+extern bool commonio_present (const struct commonio_db *db);
+extern int commonio_lock (struct commonio_db *);
+extern int commonio_lock_nowait (struct commonio_db *, bool log);
+extern int commonio_open (struct commonio_db *, int);
+extern /*@observer@*/ /*@null@*/const void *commonio_locate (struct commonio_db *, const char *);
+extern int commonio_update (struct commonio_db *, const void *);
+#ifdef ENABLE_SUBIDS
+extern int commonio_append (struct commonio_db *, const void *);
+#endif				/* ENABLE_SUBIDS */
+extern int commonio_remove (struct commonio_db *, const char *);
+extern int commonio_rewind (struct commonio_db *);
+extern /*@observer@*/ /*@null@*/const void *commonio_next (struct commonio_db *);
+extern int commonio_close (struct commonio_db *);
+extern int commonio_unlock (struct commonio_db *);
+extern void commonio_del_entry (struct commonio_db *,
+                                const struct commonio_entry *);
+extern int commonio_sort_wrt (struct commonio_db *shadow,
+                              const struct commonio_db *passwd);
+extern int commonio_sort (struct commonio_db *db,
+                          int (*cmp) (const void *, const void *));
+
+#endif
diff --git a/lib/defines.h b/lib/defines.h
new file mode 100644
index 0000000..d01f691
--- /dev/null
+++ b/lib/defines.h
@@ -0,0 +1,339 @@
+/* $Id$ */
+/* some useful defines */
+
+#ifndef _DEFINES_H_
+#define _DEFINES_H_
+
+#include "config.h"
+
+#if HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# if ! HAVE__BOOL
+#  ifdef __cplusplus
+typedef bool _Bool;
+#  else
+typedef unsigned char _Bool;
+#  endif
+# endif
+# define bool _Bool
+# define false (0)
+# define true  (1)
+# define __bool_true_false_are_defined 1
+#endif
+
+/* Take care of NLS matters.  */
+#ifdef S_SPLINT_S
+extern char *setlocale(int categories, const char *locale);
+# define LC_ALL		(6)
+extern char * bindtextdomain (const char * domainname, const char * dirname);
+extern char * textdomain (const char * domainname);
+# define _(Text) Text
+# define ngettext(Msgid1, Msgid2, N) \
+    ((N) == 1 ? (const char *) (Msgid1) : (const char *) (Msgid2))
+#else
+#ifdef HAVE_LOCALE_H
+# include <locale.h>
+#else
+# undef setlocale
+# define setlocale(category, locale)	(NULL)
+# ifndef LC_ALL
+#  define LC_ALL	6
+# endif
+#endif
+
+#define gettext_noop(String) (String)
+/* #define gettext_def(String) "#define String" */
+
+#ifdef ENABLE_NLS
+# include <libintl.h>
+# define _(Text) gettext (Text)
+#else
+# undef bindtextdomain
+# define bindtextdomain(Domain, Directory)	(NULL)
+# undef textdomain
+# define textdomain(Domain)	(NULL)
+# define _(Text) Text
+# define ngettext(Msgid1, Msgid2, N) \
+    ((N) == 1 ? (const char *) (Msgid1) : (const char *) (Msgid2))
+#endif
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+
+#if HAVE_ERRNO_H
+# include <errno.h>
+#endif
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+/*
+ * crypt(3), crypt_gensalt(3), and their
+ * feature test macros may be defined in here.
+ */
+#if HAVE_CRYPT_H
+# include <crypt.h>
+#endif
+
+#include <sys/time.h>
+#include <time.h>
+
+#ifdef HAVE_MEMSET_S
+# define memzero(ptr, size) memset_s((ptr), 0, (size))
+#elif defined HAVE_EXPLICIT_BZERO	/* !HAVE_MEMSET_S */
+# define memzero(ptr, size) explicit_bzero((ptr), (size))
+#else					/* !HAVE_MEMSET_S && HAVE_EXPLICIT_BZERO */
+static inline void memzero(void *ptr, size_t size)
+{
+	volatile unsigned char * volatile p = ptr;
+	while (size--) {
+		*p++ = '\0';
+	}
+}
+#endif					/* !HAVE_MEMSET_S && !HAVE_EXPLICIT_BZERO */
+
+#define strzero(s) memzero(s, strlen(s))	/* warning: evaluates twice */
+
+#include <dirent.h>
+
+/*
+ * Possible cases:
+ * - /usr/include/shadow.h exists and includes the shadow group stuff.
+ * - /usr/include/shadow.h exists, but we use our own gshadow.h.
+ */
+#include <shadow.h>
+#if defined(SHADOWGRP) && !defined(GSHADOW)
+#include "gshadow_.h"
+#endif
+
+#include <limits.h>
+
+#ifndef	NGROUPS_MAX
+#ifdef	NGROUPS
+#define	NGROUPS_MAX	NGROUPS
+#else
+#define	NGROUPS_MAX	64
+#endif
+#endif
+
+#ifdef USE_SYSLOG
+#include <syslog.h>
+
+#ifndef LOG_WARN
+#define LOG_WARN LOG_WARNING
+#endif
+
+/* LOG_NOWAIT is deprecated */
+#ifndef LOG_NOWAIT
+#define LOG_NOWAIT 0
+#endif
+
+/* LOG_AUTH is deprecated, use LOG_AUTHPRIV instead */
+#ifndef LOG_AUTHPRIV
+#define LOG_AUTHPRIV LOG_AUTH
+#endif
+
+/* cleaner than lots of #ifdefs everywhere - use this as follows:
+   SYSLOG((LOG_CRIT, "user %s cracked root", user)); */
+#ifdef ENABLE_NLS
+/* Temporarily set LC_TIME to "C" to avoid strange dates in syslog.
+   This is a workaround for a more general syslog(d) design problem -
+   syslogd should log the current system time for each event, and not
+   trust the formatted time received from the unix domain (or worse,
+   UDP) socket.  -MM */
+/* Avoid translated PAM error messages: Set LC_ALL to "C".
+ * --Nekral */
+#define SYSLOG(x)							\
+	do {								\
+		char *old_locale = setlocale (LC_ALL, NULL);		\
+		char *saved_locale = NULL;				\
+		if (NULL != old_locale) {				\
+			saved_locale = strdup (old_locale);		\
+		}							\
+		if (NULL != saved_locale) {				\
+			(void) setlocale (LC_ALL, "C");			\
+		}							\
+		syslog x ;						\
+		if (NULL != saved_locale) {				\
+			(void) setlocale (LC_ALL, saved_locale);	\
+			free (saved_locale);				\
+		}							\
+	} while (false)
+#else				/* !ENABLE_NLS */
+#define SYSLOG(x) syslog x
+#endif				/* !ENABLE_NLS */
+
+#else				/* !USE_SYSLOG */
+
+#define SYSLOG(x)		/* empty */
+#define openlog(a,b,c)		/* empty */
+#define closelog()		/* empty */
+
+#endif				/* !USE_SYSLOG */
+
+/* The default syslog settings can now be changed here,
+   in just one place.  */
+
+#ifndef SYSLOG_OPTIONS
+/* #define SYSLOG_OPTIONS (LOG_PID | LOG_CONS | LOG_NOWAIT) */
+#define SYSLOG_OPTIONS (LOG_PID)
+#endif
+
+#ifndef SYSLOG_FACILITY
+#define SYSLOG_FACILITY LOG_AUTHPRIV
+#endif
+
+#define OPENLOG(progname) openlog(progname, SYSLOG_OPTIONS, SYSLOG_FACILITY)
+
+#ifndef F_OK
+# define F_OK 0
+# define X_OK 1
+# define W_OK 2
+# define R_OK 4
+#endif
+
+#ifndef SEEK_SET
+# define SEEK_SET 0
+# define SEEK_CUR 1
+# define SEEK_END 2
+#endif
+
+#if HAVE_TERMIOS_H
+# include <termios.h>
+# define STTY(fd, termio) tcsetattr(fd, TCSANOW, termio)
+# define GTTY(fd, termio) tcgetattr(fd, termio)
+# define TERMIO struct termios
+# define USE_TERMIOS
+#else				/* assumed HAVE_TERMIO_H */
+# include <sys/ioctl.h>
+# include <termio.h>
+# define STTY(fd, termio) ioctl(fd, TCSETA, termio)
+# define GTTY(fd, termio) ioctl(fd, TCGETA, termio)
+# define TEMRIO struct termio
+# define USE_TERMIO
+#endif
+
+/*
+ * Password aging constants
+ *
+ * DAY - seconds / day
+ * WEEK - seconds / week
+ * SCALE - seconds / aging unit
+ */
+
+/* Solaris defines this in shadow.h */
+#ifndef DAY
+#define DAY (24L*3600L)
+#endif
+
+#define WEEK (7*DAY)
+
+#ifdef ITI_AGING
+#define SCALE 1
+#else
+#define SCALE DAY
+#endif
+
+/* Copy string pointed by B to array A with size checking.  It was originally
+   in lmain.c but is _very_ useful elsewhere.  Some setuid root programs with
+   very sloppy coding used to assume that BUFSIZ will always be enough...  */
+
+					/* danger - side effects */
+#define STRFCPY(A,B) \
+	(strncpy((A), (B), sizeof(A) - 1), (A)[sizeof(A) - 1] = '\0')
+
+#ifndef PASSWD_FILE
+#define PASSWD_FILE "/etc/passwd"
+#endif
+
+#ifndef GROUP_FILE
+#define GROUP_FILE "/etc/group"
+#endif
+
+#ifndef SHADOW_FILE
+#define SHADOW_FILE "/etc/shadow"
+#endif
+
+#ifdef SHADOWGRP
+#ifndef SGROUP_FILE
+#define SGROUP_FILE "/etc/gshadow"
+#endif
+#endif
+
+#ifndef NULL
+#define NULL ((void *) 0)
+#endif
+
+#ifdef sun			/* hacks for compiling on SunOS */
+# ifndef SOLARIS
+extern int fputs ();
+extern char *strdup ();
+extern char *strerror ();
+# endif
+#endif
+
+/*
+ * string to use for the pw_passwd field in /etc/passwd when using
+ * shadow passwords - most systems use "x" but there are a few
+ * exceptions, so it can be changed here if necessary.  --marekm
+ */
+#ifndef SHADOW_PASSWD_STRING
+#define SHADOW_PASSWD_STRING "x"
+#endif
+
+#define SHADOW_SP_FLAG_UNSET ((unsigned long int)-1)
+
+#ifdef WITH_AUDIT
+#ifdef __u8			/* in case we use pam < 0.80 */
+#undef __u8
+#endif
+#ifdef __u32
+#undef __u32
+#endif
+
+#include <libaudit.h>
+#endif
+
+/* To be used for verified unused parameters */
+#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
+# define unused __attribute__((unused))
+# define format_attr(type, index, check) __attribute__((format (type, index, check)))
+#else
+# define unused
+# define format_attr(type, index, check)
+#endif
+
+/* Maximum length of usernames */
+#ifdef HAVE_UTMPX_H
+# include <utmpx.h>
+# define USER_NAME_MAX_LENGTH (sizeof (((struct utmpx *)NULL)->ut_user))
+#else
+# include <utmp.h>
+# ifdef HAVE_STRUCT_UTMP_UT_USER
+#  define USER_NAME_MAX_LENGTH (sizeof (((struct utmp *)NULL)->ut_user))
+# else
+#  ifdef HAVE_STRUCT_UTMP_UT_NAME
+#   define USER_NAME_MAX_LENGTH (sizeof (((struct utmp *)NULL)->ut_name))
+#  else
+#   define USER_NAME_MAX_LENGTH 32
+#  endif
+# endif
+#endif
+
+/* Maximum length of passwd entry */
+#define PASSWD_ENTRY_MAX_LENGTH 32768
+
+#ifdef HAVE_SECURE_GETENV
+#  define shadow_getenv(name) secure_getenv(name)
+# else
+#  define shadow_getenv(name) getenv(name)
+#endif
+
+#endif				/* _DEFINES_H_ */
diff --git a/lib/encrypt.c b/lib/encrypt.c
new file mode 100644
index 0000000..c84a255
--- /dev/null
+++ b/lib/encrypt.c
@@ -0,0 +1,79 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1993, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2010, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <unistd.h>
+#include <stdio.h>
+
+#include "prototypes.h"
+#include "defines.h"
+#include "shadowlog_internal.h"
+
+/*@exposed@*//*@null@*/char *pw_encrypt (const char *clear, const char *salt)
+{
+	static char cipher[128];
+	char *cp;
+
+	cp = crypt (clear, salt);
+	if (NULL == cp) {
+		/*
+		 * Single Unix Spec: crypt() may return a null pointer,
+		 * and set errno to indicate an error. In this case return
+		 * the NULL so the caller can handle appropriately.
+		 */
+		return NULL;
+	}
+
+	/* Some crypt() do not return NULL if the algorithm is not
+	 * supported, and return a DES encrypted password. */
+	if ((NULL != salt) && (salt[0] == '$') && (strlen (cp) <= 13))
+	{
+		/*@observer@*/const char *method;
+		switch (salt[1])
+		{
+			case '1':
+				method = "MD5";
+				break;
+			case '2':
+				method = "BCRYPT";
+				break;
+			case '5':
+				method = "SHA256";
+				break;
+			case '6':
+				method = "SHA512";
+				break;
+			case 'y':
+				method = "YESCRYPT";
+				break;
+			default:
+			{
+				static char nummethod[4] = "$x$";
+				nummethod[1] = salt[1];
+				method = &nummethod[0];
+			}
+		}
+		(void) fprintf (shadow_logfd,
+		                _("crypt method not supported by libcrypt? (%s)\n"),
+		                method);
+		exit (EXIT_FAILURE);
+	}
+
+	if (strlen (cp) != 13) {
+		return cp;	/* nonstandard crypt() in libc, better bail out */
+	}
+
+	strcpy (cipher, cp);
+
+	return cipher;
+}
+
diff --git a/lib/exitcodes.h b/lib/exitcodes.h
new file mode 100644
index 0000000..7dbe340
--- /dev/null
+++ b/lib/exitcodes.h
@@ -0,0 +1,26 @@
+/*
+ * SPDX-FileCopyrightText: 2005 - 2006, Tomasz Kłoczko
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/* $Id$ */
+
+/*
+ * Exit codes used by shadow programs
+ */
+#define E_SUCCESS       	EXIT_SUCCESS	/* success */
+/*
+ * FIXME: other values should differ from EXIT_FAILURE (and EXIT_SUCCESS).
+ *
+ * FIXME: reserve EXIT_FAILURE for internal failures.
+ */
+#define E_NOPERM        	1	/* permission denied */
+#define E_USAGE         	2	/* invalid command syntax */
+#define E_BAD_ARG       	3	/* invalid argument to option */
+#define E_PASSWD_NOTFOUND	14	/* not found password file */
+#define E_SHADOW_NOTFOUND	15	/* not found shadow password file */
+#define E_GROUP_NOTFOUND	16	/* not found group file */
+#define E_GSHADOW_NOTFOUND	17	/* not found shadow group file */
+#define E_CMD_NOEXEC		126	/* can't run command/shell */
+#define E_CMD_NOTFOUND		127	/* can't find command/shell to run */
diff --git a/lib/faillog.h b/lib/faillog.h
new file mode 100644
index 0000000..38476ea
--- /dev/null
+++ b/lib/faillog.h
@@ -0,0 +1,34 @@
+/*
+ * SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1997, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * faillog.h - login failure logging file format
+ *
+ *	$Id$
+ *
+ * The login failure file is maintained by login(1) and faillog(8)
+ * Each record in the file represents a separate UID and the file
+ * is indexed in that fashion.
+ */
+
+#ifndef _FAILLOG_H
+#define _FAILLOG_H
+
+struct faillog {
+	short fail_cnt;		/* failures since last success */
+	short fail_max;		/* failures before turning account off */
+	char fail_line[12];	/* last failure occurred here */
+	time_t fail_time;	/* last failure occurred then */
+	/*
+	 * If nonzero, the account will be re-enabled if there are no
+	 * failures for fail_locktime seconds since last failure.
+	 */
+	long fail_locktime;
+};
+
+#endif
diff --git a/lib/fields.c b/lib/fields.c
new file mode 100644
index 0000000..8a56035
--- /dev/null
+++ b/lib/fields.c
@@ -0,0 +1,107 @@
+/*
+ * SPDX-FileCopyrightText: 1990       , Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1997, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <ctype.h>
+#include <string.h>
+#include <stdio.h>
+#include "prototypes.h"
+
+/*
+ * valid_field - insure that a field contains all legal characters
+ *
+ * The supplied field is scanned for non-printable and other illegal
+ * characters.
+ *  + -1 is returned if an illegal character is present.
+ *  +  1 is returned if no illegal characters are present, but the field
+ *       contains a non-printable character.
+ *  +  0 is returned otherwise.
+ */
+int valid_field (const char *field, const char *illegal)
+{
+	const char *cp;
+	int err = 0;
+
+	if (NULL == field) {
+		return -1;
+	}
+
+	/* For each character of field, search if it appears in the list
+	 * of illegal characters. */
+	for (cp = field; '\0' != *cp; cp++) {
+		if (strchr (illegal, *cp) != NULL) {
+			err = -1;
+			break;
+		}
+	}
+
+	if (0 == err) {
+		/* Search if there are some non-printable characters */
+		for (cp = field; '\0' != *cp; cp++) {
+			if (!isprint (*cp)) {
+				err = 1;
+				break;
+			}
+		}
+	}
+
+	return err;
+}
+
+/*
+ * change_field - change a single field if a new value is given.
+ *
+ * prompt the user with the name of the field being changed and the
+ * current value.
+ */
+void change_field (char *buf, size_t maxsize, const char *prompt)
+{
+	char newf[200];
+	char *cp;
+
+	if (maxsize > sizeof (newf)) {
+		maxsize = sizeof (newf);
+	}
+
+	printf ("\t%s [%s]: ", prompt, buf);
+	(void) fflush (stdout);
+	if (fgets (newf, (int) maxsize, stdin) != newf) {
+		return;
+	}
+
+	cp = strchr (newf, '\n');
+	if (NULL == cp) {
+		return;
+	}
+	*cp = '\0';
+
+	if ('\0' != newf[0]) {
+		/*
+		 * Remove leading and trailing whitespace.  This also
+		 * makes it possible to change the field to empty, by
+		 * entering a space.  --marekm
+		 */
+
+		while (--cp >= newf && isspace (*cp));
+		cp++;
+		*cp = '\0';
+
+		cp = newf;
+		while (('\0' != *cp) && isspace (*cp)) {
+			cp++;
+		}
+
+		strncpy (buf, cp, maxsize - 1);
+		buf[maxsize - 1] = '\0';
+	}
+}
+
diff --git a/lib/fputsx.c b/lib/fputsx.c
new file mode 100644
index 0000000..bb71ab2
--- /dev/null
+++ b/lib/fputsx.c
@@ -0,0 +1,67 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1999, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include "defines.h"
+#include "prototypes.h"
+
+#ident "$Id$"
+
+
+/*@null@*/char *fgetsx (/*@returned@*/ /*@out@*/char *buf, int cnt, FILE * f)
+{
+	char *cp = buf;
+	char *ep;
+
+	while (cnt > 0) {
+		if (fgets (cp, cnt, f) != cp) {
+			if (cp == buf) {
+				return 0;
+			} else {
+				break;
+			}
+		}
+		ep = strrchr (cp, '\\');
+		if ((NULL != ep) && (*(ep + 1) == '\n')) {
+			cnt -= ep - cp;
+			if (cnt > 0) {
+				cp = ep;
+				*cp = '\0';
+			}
+		} else {
+			break;
+		}
+	}
+	return buf;
+}
+
+int fputsx (const char *s, FILE * stream)
+{
+	int i;
+
+	for (i = 0; '\0' != *s; i++, s++) {
+		if (putc (*s, stream) == EOF) {
+			return EOF;
+		}
+
+#if 0				/* The standard getgr*() can't handle that.  --marekm */
+		if (i > (BUFSIZ / 2)) {
+			if (putc ('\\', stream) == EOF ||
+			    putc ('\n', stream) == EOF)
+				return EOF;
+
+			i = 0;
+		}
+#endif
+	}
+	return 0;
+}
+
diff --git a/lib/get_gid.c b/lib/get_gid.c
new file mode 100644
index 0000000..cbcd6f4
--- /dev/null
+++ b/lib/get_gid.c
@@ -0,0 +1,31 @@
+/*
+ * SPDX-FileCopyrightText: 2009       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include "prototypes.h"
+#include "defines.h"
+
+int get_gid (const char *gidstr, gid_t *gid)
+{
+	long long int val;
+	char *endptr;
+
+	errno = 0;
+	val = strtoll (gidstr, &endptr, 10);
+	if (   ('\0' == *gidstr)
+	    || ('\0' != *endptr)
+	    || (ERANGE == errno)
+	    || (/*@+longintegral@*/val != (gid_t)val)/*@=longintegral@*/) {
+		return 0;
+	}
+
+	*gid = (gid_t)val;
+	return 1;
+}
+
diff --git a/lib/get_pid.c b/lib/get_pid.c
new file mode 100644
index 0000000..383eb69
--- /dev/null
+++ b/lib/get_pid.c
@@ -0,0 +1,31 @@
+/*
+ * SPDX-FileCopyrightText: 2009       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include "prototypes.h"
+#include "defines.h"
+
+int get_pid (const char *pidstr, pid_t *pid)
+{
+	long long int val;
+	char *endptr;
+
+	errno = 0;
+	val = strtoll (pidstr, &endptr, 10);
+	if (   ('\0' == *pidstr)
+	    || ('\0' != *endptr)
+	    || (ERANGE == errno)
+	    || (/*@+longintegral@*/val != (pid_t)val)/*@=longintegral@*/) {
+		return 0;
+	}
+
+	*pid = (pid_t)val;
+	return 1;
+}
+
diff --git a/lib/get_uid.c b/lib/get_uid.c
new file mode 100644
index 0000000..50f9922
--- /dev/null
+++ b/lib/get_uid.c
@@ -0,0 +1,31 @@
+/*
+ * SPDX-FileCopyrightText: 2009       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include "prototypes.h"
+#include "defines.h"
+
+int get_uid (const char *uidstr, uid_t *uid)
+{
+	long long int val;
+	char *endptr;
+
+	errno = 0;
+	val = strtoll (uidstr, &endptr, 10);
+	if (   ('\0' == *uidstr)
+	    || ('\0' != *endptr)
+	    || (ERANGE == errno)
+	    || (/*@+longintegral@*/val != (uid_t)val)/*@=longintegral@*/) {
+		return 0;
+	}
+
+	*uid = (uid_t)val;
+	return 1;
+}
+
diff --git a/lib/getdef.c b/lib/getdef.c
new file mode 100644
index 0000000..dcd1fe7
--- /dev/null
+++ b/lib/getdef.c
@@ -0,0 +1,623 @@
+/*
+ * SPDX-FileCopyrightText: 1991 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2002 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2008, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include "prototypes.h"
+#include "defines.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <errno.h>
+#ifdef USE_ECONF
+#include <libeconf.h>
+#endif
+#include "getdef.h"
+#include "shadowlog_internal.h"
+/*
+ * A configuration item definition.
+ */
+struct itemdef {
+	/*@null@*/const char *name;	/* name of the item                     */
+	/*@null@*/char *value;		/* value given, or NULL if no value     */
+};
+
+#define PAMDEFS					\
+	{"CHFN_AUTH", NULL},			\
+	{"CHSH_AUTH", NULL},			\
+	{"CRACKLIB_DICTPATH", NULL},		\
+	{"ENV_HZ", NULL},			\
+	{"ENVIRON_FILE", NULL},			\
+	{"ENV_TZ", NULL},			\
+	{"FAILLOG_ENAB", NULL},			\
+	{"FTMP_FILE", NULL},			\
+	{"HMAC_CRYPTO_ALGO", NULL},		\
+	{"ISSUE_FILE", NULL},			\
+	{"LASTLOG_ENAB", NULL},			\
+	{"LOGIN_STRING", NULL},			\
+	{"MAIL_CHECK_ENAB", NULL},		\
+	{"MOTD_FILE", NULL},			\
+	{"NOLOGINS_FILE", NULL},		\
+	{"OBSCURE_CHECKS_ENAB", NULL},		\
+	{"PASS_ALWAYS_WARN", NULL},		\
+	{"PASS_CHANGE_TRIES", NULL},		\
+	{"PASS_MAX_LEN", NULL},			\
+	{"PASS_MIN_LEN", NULL},			\
+	{"PORTTIME_CHECKS_ENAB", NULL},		\
+	{"QUOTAS_ENAB", NULL},			\
+	{"SU_WHEEL_ONLY", NULL},		\
+	{"ULIMIT", NULL},
+
+/*
+ * Items used in other tools (util-linux, etc.)
+ */
+#define FOREIGNDEFS				\
+	{"ALWAYS_SET_PATH", NULL},		\
+	{"ENV_ROOTPATH", NULL},			\
+	{"LOGIN_KEEP_USERNAME", NULL},		\
+	{"LOGIN_PLAIN_PROMPT", NULL},		\
+	{"MOTD_FIRSTONLY", NULL},		\
+
+
+#define NUMDEFS	(sizeof(def_table)/sizeof(def_table[0]))
+static struct itemdef def_table[] = {
+	{"CHFN_RESTRICT", NULL},
+	{"CONSOLE_GROUPS", NULL},
+	{"CONSOLE", NULL},
+	{"CREATE_HOME", NULL},
+	{"DEFAULT_HOME", NULL},
+	{"ENCRYPT_METHOD", NULL},
+	{"ENV_PATH", NULL},
+	{"ENV_SUPATH", NULL},
+	{"ERASECHAR", NULL},
+	{"FAIL_DELAY", NULL},
+	{"FAKE_SHELL", NULL},
+	{"GID_MAX", NULL},
+	{"GID_MIN", NULL},
+	{"HOME_MODE", NULL},
+	{"HUSHLOGIN_FILE", NULL},
+	{"KILLCHAR", NULL},
+	{"LASTLOG_UID_MAX", NULL},
+	{"LOGIN_RETRIES", NULL},
+	{"LOGIN_TIMEOUT", NULL},
+	{"LOG_OK_LOGINS", NULL},
+	{"LOG_UNKFAIL_ENAB", NULL},
+	{"MAIL_DIR", NULL},
+	{"MAIL_FILE", NULL},
+	{"MAX_MEMBERS_PER_GROUP", NULL},
+	{"MD5_CRYPT_ENAB", NULL},
+	{"NONEXISTENT", NULL},
+	{"PASS_MAX_DAYS", NULL},
+	{"PASS_MIN_DAYS", NULL},
+	{"PASS_WARN_AGE", NULL},
+#ifdef USE_SHA_CRYPT
+	{"SHA_CRYPT_MAX_ROUNDS", NULL},
+	{"SHA_CRYPT_MIN_ROUNDS", NULL},
+#endif
+#ifdef USE_BCRYPT
+	{"BCRYPT_MAX_ROUNDS", NULL},
+	{"BCRYPT_MIN_ROUNDS", NULL},
+#endif
+#ifdef USE_YESCRYPT
+	{"YESCRYPT_COST_FACTOR", NULL},
+#endif
+	{"SUB_GID_COUNT", NULL},
+	{"SUB_GID_MAX", NULL},
+	{"SUB_GID_MIN", NULL},
+	{"SUB_UID_COUNT", NULL},
+	{"SUB_UID_MAX", NULL},
+	{"SUB_UID_MIN", NULL},
+	{"SULOG_FILE", NULL},
+	{"SU_NAME", NULL},
+	{"SYS_GID_MAX", NULL},
+	{"SYS_GID_MIN", NULL},
+	{"SYS_UID_MAX", NULL},
+	{"SYS_UID_MIN", NULL},
+	{"TTYGROUP", NULL},
+	{"TTYPERM", NULL},
+	{"TTYTYPE_FILE", NULL},
+	{"UID_MAX", NULL},
+	{"UID_MIN", NULL},
+	{"UMASK", NULL},
+	{"USERDEL_CMD", NULL},
+	{"USERGROUPS_ENAB", NULL},
+#ifndef USE_PAM
+	PAMDEFS
+#endif
+#ifdef USE_SYSLOG
+	{"SYSLOG_SG_ENAB", NULL},
+	{"SYSLOG_SU_ENAB", NULL},
+#endif
+#ifdef WITH_TCB
+	{"TCB_AUTH_GROUP", NULL},
+	{"TCB_SYMLINKS", NULL},
+	{"USE_TCB", NULL},
+#endif
+	{"FORCE_SHADOW", NULL},
+	{"GRANT_AUX_GROUP_SUBIDS", NULL},
+	{"PREVENT_NO_AUTH", NULL},
+	{NULL, NULL}
+};
+
+#define NUMKNOWNDEFS	(sizeof(knowndef_table)/sizeof(knowndef_table[0]))
+static struct itemdef knowndef_table[] = {
+#ifdef USE_PAM
+	PAMDEFS
+#endif
+	FOREIGNDEFS
+	{NULL, NULL}
+};
+
+#ifdef USE_ECONF
+#ifdef VENDORDIR
+static const char* vendordir = VENDORDIR;
+#else
+static const char* vendordir = NULL;
+#endif
+static const char* sysconfdir = "/etc";
+#else
+#ifndef LOGINDEFS
+#define LOGINDEFS "/etc/login.defs"
+#endif
+
+static const char* def_fname = LOGINDEFS;	/* login config defs file       */
+#endif
+static bool def_loaded = false;		/* are defs already loaded?     */
+
+/* local function prototypes */
+static /*@observer@*/ /*@null@*/struct itemdef *def_find (const char *);
+static void def_load (void);
+
+
+/*
+ * getdef_str - get string value from table of definitions.
+ *
+ * Return point to static data for specified item, or NULL if item is not
+ * defined.  First time invoked, will load definitions from the file.
+ */
+
+/*@observer@*/ /*@null@*/const char *getdef_str (const char *item)
+{
+	struct itemdef *d;
+
+	if (!def_loaded) {
+		def_load ();
+	}
+
+	d = def_find (item);
+	return ((NULL == d)? (const char *) NULL : d->value);
+}
+
+
+/*
+ * getdef_bool - get boolean value from table of definitions.
+ *
+ * Return TRUE if specified item is defined as "yes", else FALSE.
+ */
+
+bool getdef_bool (const char *item)
+{
+	struct itemdef *d;
+
+	if (!def_loaded) {
+		def_load ();
+	}
+
+	d = def_find (item);
+	if ((NULL == d) || (NULL == d->value)) {
+		return false;
+	}
+
+	return (strcasecmp (d->value, "yes") == 0);
+}
+
+
+/*
+ * getdef_num - get numerical value from table of definitions
+ *
+ * Returns numeric value of specified item, else the "dflt" value if
+ * the item is not defined.  Octal (leading "0") and hex (leading "0x")
+ * values are handled.
+ */
+
+int getdef_num (const char *item, int dflt)
+{
+	struct itemdef *d;
+	long val;
+
+	if (!def_loaded) {
+		def_load ();
+	}
+
+	d = def_find (item);
+	if ((NULL == d) || (NULL == d->value)) {
+		return dflt;
+	}
+
+	if (   (getlong (d->value, &val) == 0)
+	    || (val > INT_MAX)
+	    || (val < INT_MIN)) {
+		fprintf (shadow_logfd,
+		         _("configuration error - cannot parse %s value: '%s'"),
+		         item, d->value);
+		return dflt;
+	}
+
+	return (int) val;
+}
+
+
+/*
+ * getdef_unum - get unsigned numerical value from table of definitions
+ *
+ * Returns numeric value of specified item, else the "dflt" value if
+ * the item is not defined.  Octal (leading "0") and hex (leading "0x")
+ * values are handled.
+ */
+
+unsigned int getdef_unum (const char *item, unsigned int dflt)
+{
+	struct itemdef *d;
+	long val;
+
+	if (!def_loaded) {
+		def_load ();
+	}
+
+	d = def_find (item);
+	if ((NULL == d) || (NULL == d->value)) {
+		return dflt;
+	}
+
+	if (   (getlong (d->value, &val) == 0)
+	    || (val < 0)
+	    || (val > INT_MAX)) {
+		fprintf (shadow_logfd,
+		         _("configuration error - cannot parse %s value: '%s'"),
+		         item, d->value);
+		return dflt;
+	}
+
+	return (unsigned int) val;
+}
+
+
+/*
+ * getdef_long - get long integer value from table of definitions
+ *
+ * Returns numeric value of specified item, else the "dflt" value if
+ * the item is not defined.  Octal (leading "0") and hex (leading "0x")
+ * values are handled.
+ */
+
+long getdef_long (const char *item, long dflt)
+{
+	struct itemdef *d;
+	long val;
+
+	if (!def_loaded) {
+		def_load ();
+	}
+
+	d = def_find (item);
+	if ((NULL == d) || (NULL == d->value)) {
+		return dflt;
+	}
+
+	if (getlong (d->value, &val) == 0) {
+		fprintf (shadow_logfd,
+		         _("configuration error - cannot parse %s value: '%s'"),
+		         item, d->value);
+		return dflt;
+	}
+
+	return val;
+}
+
+/*
+ * getdef_ulong - get unsigned long numerical value from table of definitions
+ *
+ * Returns numeric value of specified item, else the "dflt" value if
+ * the item is not defined.  Octal (leading "0") and hex (leading "0x")
+ * values are handled.
+ */
+
+unsigned long getdef_ulong (const char *item, unsigned long dflt)
+{
+	struct itemdef *d;
+	unsigned long val;
+
+	if (!def_loaded) {
+		def_load ();
+	}
+
+	d = def_find (item);
+	if ((NULL == d) || (NULL == d->value)) {
+		return dflt;
+	}
+
+	if (getulong (d->value, &val) == 0) {
+		fprintf (shadow_logfd,
+		         _("configuration error - cannot parse %s value: '%s'"),
+		         item, d->value);
+		return dflt;
+	}
+
+	return val;
+}
+
+/*
+ * putdef_str - override the value read from /etc/login.defs
+ * (also used when loading the initial defaults)
+ */
+
+int putdef_str (const char *name, const char *value)
+{
+	struct itemdef *d;
+	char *cp;
+
+	if (!def_loaded) {
+		def_load ();
+	}
+
+	/*
+	 * Locate the slot to save the value.  If this parameter
+	 * is unknown then "def_find" will print an err message.
+	 */
+	d = def_find (name);
+	if (NULL == d) {
+		return -1;
+	}
+
+	/*
+	 * Save off the value.
+	 */
+	cp = strdup (value);
+	if (NULL == cp) {
+		(void) fputs (_("Could not allocate space for config info.\n"),
+		              shadow_logfd);
+		SYSLOG ((LOG_ERR, "could not allocate space for config info"));
+		return -1;
+	}
+
+	free (d->value);
+	d->value = cp;
+	return 0;
+}
+
+
+/*
+ * def_find - locate named item in table
+ *
+ * Search through a table of configurable items to locate the
+ * specified configuration option.
+ */
+
+static /*@observer@*/ /*@null@*/struct itemdef *def_find (const char *name)
+{
+	struct itemdef *ptr;
+
+	/*
+	 * Search into the table.
+	 */
+
+	for (ptr = def_table; NULL != ptr->name; ptr++) {
+		if (strcmp (ptr->name, name) == 0) {
+			return ptr;
+		}
+	}
+
+	/*
+	 * Item was never found.
+	 */
+
+	for (ptr = knowndef_table; NULL != ptr->name; ptr++) {
+		if (strcmp (ptr->name, name) == 0) {
+			goto out;
+		}
+	}
+	fprintf (shadow_logfd,
+	         _("configuration error - unknown item '%s' (notify administrator)\n"),
+	         name);
+	SYSLOG ((LOG_CRIT, "unknown configuration item `%s'", name));
+
+out:
+	return (struct itemdef *) NULL;
+}
+
+/*
+ * setdef_config_file - set the default configuration file path
+ *
+ * must be called prior to any def* calls.
+ */
+
+void setdef_config_file (const char* file)
+{
+#ifdef USE_ECONF
+	size_t len;
+	char* cp;
+
+	len = strlen(file) + strlen(sysconfdir) + 2;
+	cp = malloc(len);
+	if (cp == NULL)
+		exit (13);
+	snprintf(cp, len, "%s/%s", file, sysconfdir);
+	sysconfdir = cp;
+#ifdef VENDORDIR
+	len = strlen(file) + strlen(vendordir) + 2;
+	cp = malloc(len);
+	if (cp == NULL)
+		exit (13);
+	snprintf(cp, len, "%s/%s", file, vendordir);
+	vendordir = cp;
+#endif
+#else
+	def_fname = file;
+#endif
+}
+
+/*
+ * def_load - load configuration table
+ *
+ * Loads the user-configured options from the default configuration file
+ */
+
+static void def_load (void)
+{
+#ifdef USE_ECONF
+	econf_file *defs_file = NULL;
+	econf_err error;
+	char **keys;
+	size_t key_number;
+#else
+	int i;
+	FILE *fp;
+	char buf[1024], *name, *value, *s;
+#endif
+
+	/*
+	 * Set the initialized flag.
+	 * (do it early to prevent recursion in putdef_str())
+	 */
+	def_loaded = true;
+
+#ifdef USE_ECONF
+
+	error = econf_readDirs (&defs_file, vendordir, sysconfdir, "login", "defs", " \t", "#");
+	if (error) {
+		if (error == ECONF_NOFILE)
+			return;
+
+		SYSLOG ((LOG_CRIT, "cannot open login definitions [%s]",
+			econf_errString(error)));
+		exit (EXIT_FAILURE);
+	}
+
+	if ((error = econf_getKeys(defs_file, NULL, &key_number, &keys))) {
+		SYSLOG ((LOG_CRIT, "cannot read login definitions [%s]",
+			econf_errString(error)));
+		exit (EXIT_FAILURE);
+	}
+
+	for (size_t i = 0; i < key_number; i++) {
+		char *value;
+
+		econf_getStringValue(defs_file, NULL, keys[i], &value);
+
+		/*
+		 * Store the value in def_table.
+		 *
+		 * Ignore failures to load the login.defs file.
+		 * The error was already reported to the user and to
+		 * syslog. The tools will just use their default values.
+		 */
+		(void)putdef_str (keys[i], value);
+	}
+
+	econf_free (keys);
+	econf_free (defs_file);
+#else
+	/*
+	 * Open the configuration definitions file.
+	 */
+	fp = fopen (def_fname, "r");
+	if (NULL == fp) {
+		if (errno == ENOENT)
+			return;
+
+		int err = errno;
+		SYSLOG ((LOG_CRIT, "cannot open login definitions %s [%s]",
+		         def_fname, strerror (err)));
+		exit (EXIT_FAILURE);
+	}
+
+	/*
+	 * Go through all of the lines in the file.
+	 */
+	while (fgets (buf, (int) sizeof (buf), fp) != NULL) {
+
+		/*
+		 * Trim trailing whitespace.
+		 */
+		for (i = (int) strlen (buf) - 1; i >= 0; --i) {
+			if (!isspace (buf[i])) {
+				break;
+			}
+		}
+		i++;
+		buf[i] = '\0';
+
+		/*
+		 * Break the line into two fields.
+		 */
+		name = buf + strspn (buf, " \t");	/* first nonwhite */
+		if (*name == '\0' || *name == '#')
+			continue;	/* comment or empty */
+
+		s = name + strcspn (name, " \t");	/* end of field */
+		if (*s == '\0')
+			continue;	/* only 1 field?? */
+
+		*s++ = '\0';
+		value = s + strspn (s, " \"\t");	/* next nonwhite */
+		*(value + strcspn (value, "\"")) = '\0';
+
+		/*
+		 * Store the value in def_table.
+		 *
+		 * Ignore failures to load the login.defs file.
+		 * The error was already reported to the user and to
+		 * syslog. The tools will just use their default values.
+		 */
+		(void)putdef_str (name, value);
+	}
+
+	if (ferror (fp) != 0) {
+		int err = errno;
+		SYSLOG ((LOG_CRIT, "cannot read login definitions %s [%s]",
+		         def_fname, strerror (err)));
+		exit (EXIT_FAILURE);
+	}
+
+	(void) fclose (fp);
+#endif
+}
+
+
+#ifdef CKDEFS
+int main (int argc, char **argv)
+{
+	int i;
+	char *cp;
+	struct itemdef *d;
+
+	def_load ();
+
+	for (i = 0; i < NUMDEFS; ++i) {
+		d = def_find (def_table[i].name);
+		if (NULL == d) {
+			printf ("error - lookup '%s' failed\n",
+			        def_table[i].name);
+		} else {
+			printf ("%4d %-24s %s\n", i + 1, d->name, d->value);
+		}
+	}
+	for (i = 1; i < argc; i++) {
+		cp = getdef_str (argv[1]);
+		if (NULL != cp) {
+			printf ("%s `%s'\n", argv[1], cp);
+		} else {
+			printf ("%s not found\n", argv[1]);
+		}
+	}
+	exit (EXIT_SUCCESS);
+}
+#endif
diff --git a/lib/getdef.h b/lib/getdef.h
new file mode 100644
index 0000000..2bd3fc5
--- /dev/null
+++ b/lib/getdef.h
@@ -0,0 +1,25 @@
+/*
+ * SPDX-FileCopyrightText: 1991 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2002 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef _GETDEF_H
+#define _GETDEF_H
+
+/* getdef.c */
+extern bool getdef_bool (const char *);
+extern long getdef_long (const char *, long);
+extern int getdef_num (const char *, int);
+extern unsigned long getdef_ulong (const char *, unsigned long);
+extern unsigned int getdef_unum (const char *, unsigned int);
+extern /*@observer@*/ /*@null@*/const char *getdef_str (const char *);
+extern int putdef_str (const char *, const char *);
+extern void setdef_config_file (const char* file);
+
+/* default UMASK value if not specified in /etc/login.defs */
+#define		GETDEF_DEFAULT_UMASK	022
+
+#endif				/* _GETDEF_H */
diff --git a/lib/getlong.c b/lib/getlong.c
new file mode 100644
index 0000000..ec4aa54
--- /dev/null
+++ b/lib/getlong.c
@@ -0,0 +1,36 @@
+/*
+ * SPDX-FileCopyrightText: 2007 - 2009, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <stdlib.h>
+#include <errno.h>
+#include "prototypes.h"
+
+/*
+ * getlong - extract a long integer provided by the numstr string in *result
+ *
+ * It supports decimal, hexadecimal or octal representations.
+ *
+ * Returns 0 on failure, 1 on success.
+ */
+int getlong (const char *numstr, /*@out@*/long int *result)
+{
+	long val;
+	char *endptr;
+
+	errno = 0;
+	val = strtol (numstr, &endptr, 0);
+	if (('\0' == *numstr) || ('\0' != *endptr) || (ERANGE == errno)) {
+		return 0;
+	}
+
+	*result = val;
+	return 1;
+}
+
diff --git a/lib/getulong.c b/lib/getulong.c
new file mode 100644
index 0000000..33250e3
--- /dev/null
+++ b/lib/getulong.c
@@ -0,0 +1,39 @@
+/*
+ * SPDX-FileCopyrightText: 2007 - 2009, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id: getlong.c 2763 2009-04-23 09:57:03Z nekral-guest $"
+
+#include <stdlib.h>
+#include <errno.h>
+#include "prototypes.h"
+
+/*
+ * getulong - extract an unsigned long integer provided by the numstr string in *result
+ *
+ * It supports decimal, hexadecimal or octal representations.
+ *
+ * Returns 0 on failure, 1 on success.
+ */
+int getulong (const char *numstr, /*@out@*/unsigned long int *result)
+{
+	unsigned long int val;
+	char *endptr;
+
+	errno = 0;
+	val = strtoul (numstr, &endptr, 0);
+	if (    ('\0' == *numstr)
+	     || ('\0' != *endptr)
+	     || (ERANGE == errno)
+	   ) {
+		return 0;
+	}
+
+	*result = val;
+	return 1;
+}
+
diff --git a/lib/groupio.c b/lib/groupio.c
new file mode 100644
index 0000000..357a30e
--- /dev/null
+++ b/lib/groupio.c
@@ -0,0 +1,438 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001       , Michał Moskal
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2010, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <assert.h>
+#include <stdio.h>
+
+#include "prototypes.h"
+#include "defines.h"
+#include "commonio.h"
+#include "getdef.h"
+#include "groupio.h"
+
+static /*@null@*/struct commonio_entry *merge_group_entries (
+	/*@null@*/ /*@returned@*/struct commonio_entry *gr1,
+	/*@null@*/struct commonio_entry *gr2);
+static int split_groups (unsigned int max_members);
+static int group_open_hook (void);
+
+static /*@null@*/ /*@only@*/void *group_dup (const void *ent)
+{
+	const struct group *gr = ent;
+
+	return __gr_dup (gr);
+}
+
+static void group_free (/*@out@*/ /*@only@*/void *ent)
+{
+	struct group *gr = ent;
+
+	gr_free (gr);
+}
+
+static const char *group_getname (const void *ent)
+{
+	const struct group *gr = ent;
+
+	return gr->gr_name;
+}
+
+static void *group_parse (const char *line)
+{
+	return (void *) sgetgrent (line);
+}
+
+static int group_put (const void *ent, FILE * file)
+{
+	const struct group *gr = ent;
+
+	if (   (NULL == gr)
+	    || (valid_field (gr->gr_name, ":\n") == -1)
+	    || (valid_field (gr->gr_passwd, ":\n") == -1)
+	    || (gr->gr_gid == (gid_t)-1)) {
+		return -1;
+	}
+
+	/* FIXME: fail also if gr->gr_mem == NULL ?*/
+	if (NULL != gr->gr_mem) {
+		size_t i;
+		for (i = 0; NULL != gr->gr_mem[i]; i++) {
+			if (valid_field (gr->gr_mem[i], ",:\n") == -1) {
+				return -1;
+			}
+		}
+	}
+
+	return (putgrent (gr, file) == -1) ? -1 : 0;
+}
+
+static int group_close_hook (void)
+{
+	unsigned int max_members = getdef_unum("MAX_MEMBERS_PER_GROUP", 0);
+
+	if (0 == max_members) {
+		return 1;
+	}
+
+	return split_groups (max_members);
+}
+
+static struct commonio_ops group_ops = {
+	group_dup,
+	group_free,
+	group_getname,
+	group_parse,
+	group_put,
+	fgetsx,
+	fputsx,
+	group_open_hook,
+	group_close_hook
+};
+
+static /*@owned@*/struct commonio_db group_db = {
+	GROUP_FILE,		/* filename */
+	&group_ops,		/* ops */
+	NULL,			/* fp */
+#ifdef WITH_SELINUX
+	NULL,			/* scontext */
+#endif
+	0644,                   /* st_mode */
+	0,                      /* st_uid */
+	0,                      /* st_gid */
+	NULL,			/* head */
+	NULL,			/* tail */
+	NULL,			/* cursor */
+	false,			/* changed */
+	false,			/* isopen */
+	false,			/* locked */
+	false,			/* readonly */
+	false			/* setname */
+};
+
+int gr_setdbname (const char *filename)
+{
+	return commonio_setname (&group_db, filename);
+}
+
+/*@observer@*/const char *gr_dbname (void)
+{
+	return group_db.filename;
+}
+
+int gr_lock (void)
+{
+	return commonio_lock (&group_db);
+}
+
+int gr_open (int mode)
+{
+	return commonio_open (&group_db, mode);
+}
+
+/*@observer@*/ /*@null@*/const struct group *gr_locate (const char *name)
+{
+	return commonio_locate (&group_db, name);
+}
+
+/*@observer@*/ /*@null@*/const struct group *gr_locate_gid (gid_t gid)
+{
+	const struct group *grp;
+
+	gr_rewind ();
+	while (   ((grp = gr_next ()) != NULL)
+	       && (grp->gr_gid != gid)) {
+	}
+
+	return grp;
+}
+
+int gr_update (const struct group *gr)
+{
+	return commonio_update (&group_db, (const void *) gr);
+}
+
+int gr_remove (const char *name)
+{
+	return commonio_remove (&group_db, name);
+}
+
+int gr_rewind (void)
+{
+	return commonio_rewind (&group_db);
+}
+
+/*@observer@*/ /*@null@*/const struct group *gr_next (void)
+{
+	return commonio_next (&group_db);
+}
+
+int gr_close (void)
+{
+	return commonio_close (&group_db);
+}
+
+int gr_unlock (void)
+{
+	return commonio_unlock (&group_db);
+}
+
+void __gr_set_changed (void)
+{
+	group_db.changed = true;
+}
+
+/*@dependent@*/ /*@null@*/struct commonio_entry *__gr_get_head (void)
+{
+	return group_db.head;
+}
+
+/*@observer@*/const struct commonio_db *__gr_get_db (void)
+{
+	return &group_db;
+}
+
+void __gr_del_entry (const struct commonio_entry *ent)
+{
+	commonio_del_entry (&group_db, ent);
+}
+
+static int gr_cmp (const void *p1, const void *p2)
+{
+	gid_t u1, u2;
+
+	if ((*(struct commonio_entry **) p1)->eptr == NULL) {
+		return 1;
+	}
+	if ((*(struct commonio_entry **) p2)->eptr == NULL) {
+		return -1;
+	}
+
+	u1 = ((struct group *) (*(struct commonio_entry **) p1)->eptr)->gr_gid;
+	u2 = ((struct group *) (*(struct commonio_entry **) p2)->eptr)->gr_gid;
+
+	if (u1 < u2) {
+		return -1;
+	} else if (u1 > u2) {
+		return 1;
+	} else {
+		return 0;
+	}
+}
+
+/* Sort entries by GID */
+int gr_sort ()
+{
+	return commonio_sort (&group_db, gr_cmp);
+}
+
+static int group_open_hook (void)
+{
+	unsigned int max_members = getdef_unum("MAX_MEMBERS_PER_GROUP", 0);
+	struct commonio_entry *gr1, *gr2;
+
+	if (0 == max_members) {
+		return 1;
+	}
+
+	for (gr1 = group_db.head; NULL != gr1; gr1 = gr1->next) {
+		for (gr2 = gr1->next; NULL != gr2; gr2 = gr2->next) {
+			struct group *g1 = (struct group *)gr1->eptr;
+			struct group *g2 = (struct group *)gr2->eptr;
+			if (NULL != g1 &&
+			    NULL != g2 &&
+			    0 == strcmp (g1->gr_name, g2->gr_name) &&
+			    0 == strcmp (g1->gr_passwd, g2->gr_passwd) &&
+			    g1->gr_gid == g2->gr_gid) {
+				/* Both group entries refer to the same
+				 * group. It is a split group. Merge the
+				 * members. */
+				gr1 = merge_group_entries (gr1, gr2);
+				if (NULL == gr1)
+					return 0;
+				/* Unlink gr2 */
+				if (NULL != gr2->next) {
+					gr2->next->prev = gr2->prev;
+				}
+				/* gr2 does not start with head */
+				assert (NULL != gr2->prev);
+				gr2->prev->next = gr2->next;
+			}
+		}
+		assert (NULL != gr1);
+	}
+
+	return 1;
+}
+
+/*
+ * Merge the list of members of the two group entries.
+ *
+ * The commonio_entry arguments shall be group entries.
+ *
+ * You should not merge the members of two groups if they don't have the
+ * same name, password and gid.
+ *
+ * It merge the members of the second entry in the first one, and return
+ * the modified first entry on success, or NULL on failure (with errno
+ * set).
+ */
+static /*@null@*/struct commonio_entry *merge_group_entries (
+	/*@null@*/ /*@returned@*/struct commonio_entry *gr1,
+	/*@null@*/struct commonio_entry *gr2)
+{
+	struct group *gptr1;
+	struct group *gptr2;
+	char **new_members;
+	size_t members = 0;
+	char *new_line;
+	size_t new_line_len, i;
+	if (NULL == gr2 || NULL == gr1) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	gptr1 = (struct group *)gr1->eptr;
+	gptr2 = (struct group *)gr2->eptr;
+	if (NULL == gptr2 || NULL == gptr1) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	/* Concatenate the 2 lines */
+	new_line_len = strlen (gr1->line) + strlen (gr2->line) +1;
+	new_line = (char *)malloc (new_line_len + 1);
+	if (NULL == new_line) {
+		errno = ENOMEM;
+		return NULL;
+	}
+	snprintf(new_line, new_line_len + 1, "%s\n%s", gr1->line, gr2->line);
+
+	/* Concatenate the 2 list of members */
+	for (i=0; NULL != gptr1->gr_mem[i]; i++);
+	members += i;
+	for (i=0; NULL != gptr2->gr_mem[i]; i++) {
+		char **pmember = gptr1->gr_mem;
+		while (NULL != *pmember) {
+			if (0 == strcmp(*pmember, gptr2->gr_mem[i])) {
+				break;
+			}
+			pmember++;
+		}
+		if (NULL == *pmember) {
+			members++;
+		}
+	}
+	new_members = (char **)calloc ( (members+1), sizeof(char*) );
+	if (NULL == new_members) {
+		free (new_line);
+		errno = ENOMEM;
+		return NULL;
+	}
+	for (i=0; NULL != gptr1->gr_mem[i]; i++) {
+		new_members[i] = gptr1->gr_mem[i];
+	}
+	/* NULL termination enforced by above calloc */
+
+	members = i;
+	for (i=0; NULL != gptr2->gr_mem[i]; i++) {
+		char **pmember = new_members;
+		while (NULL != *pmember) {
+			if (0 == strcmp(*pmember, gptr2->gr_mem[i])) {
+				break;
+			}
+			pmember++;
+		}
+		if (NULL == *pmember) {
+			new_members[members] = gptr2->gr_mem[i];
+			members++;
+			new_members[members] = NULL;
+		}
+	}
+
+	gr1->line = new_line;
+	gptr1->gr_mem = new_members;
+
+	return gr1;
+}
+
+/*
+ * Scan the group database and split the groups which have more members
+ * than specified, if this is the result from a current change.
+ *
+ * Return 0 on failure (errno set) and 1 on success.
+ */
+static int split_groups (unsigned int max_members)
+{
+	struct commonio_entry *gr;
+
+	for (gr = group_db.head; NULL != gr; gr = gr->next) {
+		struct group *gptr = (struct group *)gr->eptr;
+		struct commonio_entry *new;
+		struct group *new_gptr;
+		unsigned int members = 0;
+		unsigned int i;
+
+		/* Check if this group must be split */
+		if (!gr->changed) {
+			continue;
+		}
+		if (NULL == gptr) {
+			continue;
+		}
+		for (members = 0; NULL != gptr->gr_mem[members]; members++);
+		if (members <= max_members) {
+			continue;
+		}
+
+		new = (struct commonio_entry *) malloc (sizeof *new);
+		if (NULL == new) {
+			errno = ENOMEM;
+			return 0;
+		}
+		new->eptr = group_dup(gr->eptr);
+		if (NULL == new->eptr) {
+			free (new);
+			errno = ENOMEM;
+			return 0;
+		}
+		new_gptr = (struct group *)new->eptr;
+		new->line = NULL;
+		new->changed = true;
+
+		/* Enforce the maximum number of members on gptr */
+		for (i = max_members; NULL != gptr->gr_mem[i]; i++) {
+			free (gptr->gr_mem[i]);
+			gptr->gr_mem[i] = NULL;
+		}
+		/* Shift all the members */
+		/* The number of members in new_gptr will be check later */
+		for (i = 0; NULL != new_gptr->gr_mem[i + max_members]; i++) {
+			free (new_gptr->gr_mem[i]);
+			new_gptr->gr_mem[i] = new_gptr->gr_mem[i + max_members];
+			new_gptr->gr_mem[i + max_members] = NULL;
+		}
+		for (; NULL != new_gptr->gr_mem[i]; i++) {
+			free (new_gptr->gr_mem[i]);
+			new_gptr->gr_mem[i] = NULL;
+		}
+
+		/* insert the new entry in the list */
+		new->prev = gr;
+		new->next = gr->next;
+		gr->next = new;
+	}
+
+	return 1;
+}
+
diff --git a/lib/groupio.h b/lib/groupio.h
new file mode 100644
index 0000000..2014de0
--- /dev/null
+++ b/lib/groupio.h
@@ -0,0 +1,32 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001       , Michał Moskal
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/* $Id$ */
+#ifndef _GROUPIO_H
+#define _GROUPIO_H
+
+#include <sys/types.h>
+#include <grp.h>
+
+extern int gr_close (void);
+extern /*@observer@*/ /*@null@*/const struct group *gr_locate (const char *name);
+extern /*@observer@*/ /*@null@*/const struct group *gr_locate_gid (gid_t gid);
+extern int gr_lock (void);
+extern int gr_setdbname (const char *filename);
+extern /*@observer@*/const char *gr_dbname (void);
+extern /*@observer@*/ /*@null@*/const struct group *gr_next (void);
+extern int gr_open (int mode);
+extern int gr_remove (const char *name);
+extern int gr_rewind (void);
+extern int gr_unlock (void);
+extern int gr_update (const struct group *gr);
+extern int gr_sort (void);
+
+#endif
diff --git a/lib/groupmem.c b/lib/groupmem.c
new file mode 100644
index 0000000..c858b72
--- /dev/null
+++ b/lib/groupmem.c
@@ -0,0 +1,118 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001       , Michał Moskal
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2013, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include "prototypes.h"
+#include "defines.h"
+#include "groupio.h"
+
+/*@null@*/ /*@only@*/struct group *__gr_dup (const struct group *grent)
+{
+	struct group *gr;
+	int i;
+
+	gr = (struct group *) malloc (sizeof *gr);
+	if (NULL == gr) {
+		return NULL;
+	}
+	/* The libc might define other fields. They won't be copied. */
+	memset (gr, 0, sizeof *gr);
+	gr->gr_gid = grent->gr_gid;
+	/*@-mustfreeonly@*/
+	gr->gr_name = strdup (grent->gr_name);
+	/*@=mustfreeonly@*/
+	if (NULL == gr->gr_name) {
+		gr_free(gr);
+		return NULL;
+	}
+	/*@-mustfreeonly@*/
+	gr->gr_passwd = strdup (grent->gr_passwd);
+	/*@=mustfreeonly@*/
+	if (NULL == gr->gr_passwd) {
+		gr_free(gr);
+		return NULL;
+	}
+
+	for (i = 0; grent->gr_mem[i]; i++);
+
+	/*@-mustfreeonly@*/
+	gr->gr_mem = (char **) malloc ((i + 1) * sizeof (char *));
+	/*@=mustfreeonly@*/
+	if (NULL == gr->gr_mem) {
+		gr_free(gr);
+		return NULL;
+	}
+	for (i = 0; grent->gr_mem[i]; i++) {
+		gr->gr_mem[i] = strdup (grent->gr_mem[i]);
+		if (NULL == gr->gr_mem[i]) {
+			gr_free(gr);
+			return NULL;
+		}
+	}
+	gr->gr_mem[i] = NULL;
+
+	return gr;
+}
+
+void gr_free_members (struct group *grent)
+{
+	if (NULL != grent->gr_mem) {
+		size_t i;
+		for (i = 0; NULL != grent->gr_mem[i]; i++) {
+			free (grent->gr_mem[i]);
+		}
+		free (grent->gr_mem);
+		grent->gr_mem = NULL;
+	}
+}
+
+void gr_free (/*@out@*/ /*@only@*/struct group *grent)
+{
+	free (grent->gr_name);
+	if (NULL != grent->gr_passwd) {
+		strzero (grent->gr_passwd);
+		free (grent->gr_passwd);
+	}
+	gr_free_members(grent);
+	free (grent);
+}
+
+bool gr_append_member(struct group *grp, char *member)
+{
+	int i;
+
+	if (NULL == grp->gr_mem || grp->gr_mem[0] == NULL) {
+		grp->gr_mem = (char **)malloc(2 * sizeof(char *));
+		if (!grp->gr_mem) {
+			return false;
+		}
+		grp->gr_mem[0] = strdup(member);
+		if (!grp->gr_mem[0]) {
+			return false;
+		}
+		grp->gr_mem[1] = NULL;
+		return true;
+	}
+
+	for (i = 0; grp->gr_mem[i]; i++) ;
+	grp->gr_mem = realloc(grp->gr_mem, (i + 2) * sizeof(char *));
+	if (NULL == grp->gr_mem) {
+		return false;
+	}
+	grp->gr_mem[i] = strdup(member);
+	if (NULL == grp->gr_mem[i]) {
+		return false;
+	}
+	grp->gr_mem[i + 1] = NULL;
+	return true;
+}
diff --git a/lib/gshadow.c b/lib/gshadow.c
new file mode 100644
index 0000000..2e12923
--- /dev/null
+++ b/lib/gshadow.c
@@ -0,0 +1,506 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008 - 2009, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+/* Newer versions of Linux libc already have shadow support.  */
+#if defined(SHADOWGRP) && !defined(HAVE_SHADOWGRP)	/*{ */
+
+#ident "$Id$"
+
+#include <stdio.h>
+#include "prototypes.h"
+#include "defines.h"
+static /*@null@*/FILE *shadow;
+static /*@null@*//*@only@*/char **members = NULL;
+static size_t nmembers = 0;
+static /*@null@*//*@only@*/char **admins = NULL;
+static size_t nadmins = 0;
+static struct sgrp sgroup;
+
+#define	FIELDS	4
+
+#ifdef	USE_NIS
+static bool nis_used;
+static bool nis_ignore;
+static enum { native, start, middle, native2 } nis_state;
+static bool nis_bound;
+static char *nis_domain;
+static char *nis_key;
+static int nis_keylen;
+static char *nis_val;
+static int nis_vallen;
+
+#define	IS_NISCHAR(c) ((c)=='+')
+#endif
+
+#ifdef	USE_NIS
+/*
+ * bind_nis - bind to NIS server
+ */
+
+static int bind_nis (void)
+{
+	if (yp_get_default_domain (&nis_domain))
+		return -1;
+
+	nis_bound = true;
+	return 0;
+}
+#endif
+
+static /*@null@*/char **build_list (char *s, char **list[], size_t * nlist)
+{
+	char **ptr = *list;
+	size_t nelem = *nlist, size;
+
+	while (s != NULL && *s != '\0') {
+		size = (nelem + 1) * sizeof (ptr);
+		ptr = realloc (*list, size);
+		if (NULL != ptr) {
+			ptr[nelem] = s;
+			nelem++;
+			*list = ptr;
+			*nlist = nelem;
+			s = strchr (s, ',');
+			if (NULL != s) {
+				*s = '\0';
+				s++;
+			}
+		}
+	}
+	size = (nelem + 1) * sizeof (ptr);
+	ptr = realloc (*list, size);
+	if (NULL != ptr) {
+		ptr[nelem] = NULL;
+		*list = ptr;
+	}
+	return ptr;
+}
+
+void setsgent (void)
+{
+#ifdef	USE_NIS
+	nis_state = native;
+#endif
+	if (NULL != shadow) {
+		rewind (shadow);
+	} else {
+		shadow = fopen (SGROUP_FILE, "r");
+	}
+}
+
+void endsgent (void)
+{
+	if (NULL != shadow) {
+		(void) fclose (shadow);
+	}
+
+	shadow = (FILE *) 0;
+}
+
+/*@observer@*//*@null@*/struct sgrp *sgetsgent (const char *string)
+{
+	static char *sgrbuf = NULL;
+	static size_t sgrbuflen = 0;
+
+	char *fields[FIELDS];
+	char *cp;
+	int i;
+	size_t len = strlen (string) + 1;
+
+	if (len > sgrbuflen) {
+		char *buf = (char *) realloc (sgrbuf, sizeof (char) * len);
+		if (NULL == buf) {
+			return NULL;
+		}
+		sgrbuf = buf;
+		sgrbuflen = len;
+	}
+
+	strncpy (sgrbuf, string, len);
+	sgrbuf[len-1] = '\0';
+
+	cp = strrchr (sgrbuf, '\n');
+	if (NULL != cp) {
+		*cp = '\0';
+	}
+
+	/*
+	 * There should be exactly 4 colon separated fields.  Find
+	 * all 4 of them and save the starting addresses in fields[].
+	 */
+
+	for (cp = sgrbuf, i = 0; (i < FIELDS) && (NULL != cp); i++) {
+		fields[i] = cp;
+		cp = strchr (cp, ':');
+		if (NULL != cp) {
+			*cp++ = '\0';
+		}
+	}
+
+	/*
+	 * If there was an extra field somehow, or perhaps not enough,
+	 * the line is invalid.
+	 */
+
+	if ((NULL != cp) || (i != FIELDS)) {
+#ifdef	USE_NIS
+		if (!IS_NISCHAR (fields[0][0])) {
+			return 0;
+		} else {
+			nis_used = true;
+		}
+#else
+		return 0;
+#endif
+	}
+
+	sgroup.sg_name = fields[0];
+	sgroup.sg_passwd = fields[1];
+	if (0 != nadmins) {
+		nadmins = 0;
+		free (admins);
+		admins = NULL;
+	}
+	if (0 != nmembers) {
+		nmembers = 0;
+		free (members);
+		members = NULL;
+	}
+	sgroup.sg_adm = build_list (fields[2], &admins, &nadmins);
+	sgroup.sg_mem = build_list (fields[3], &members, &nmembers);
+
+	return &sgroup;
+}
+
+/*
+ * fgetsgent - convert next line in stream to (struct sgrp)
+ *
+ * fgetsgent() reads the next line from the provided stream and
+ * converts it to a (struct sgrp).  NULL is returned on EOF.
+ */
+
+/*@observer@*//*@null@*/struct sgrp *fgetsgent (/*@null@*/FILE * fp)
+{
+	static size_t buflen = 0;
+	static char *buf = NULL;
+
+	char *cp;
+
+	if (0 == buflen) {
+		buf = (char *) malloc (BUFSIZ);
+		if (NULL == buf) {
+			return NULL;
+		}
+		buflen = BUFSIZ;
+	}
+
+	if (NULL == fp) {
+		return NULL;
+	}
+
+#ifdef	USE_NIS
+	while (fgetsx (buf, (int) buflen, fp) == buf)
+#else
+	if (fgetsx (buf, (int) buflen, fp) == buf)
+#endif
+	{
+		while (   ((cp = strrchr (buf, '\n')) == NULL)
+		       && (feof (fp) == 0)) {
+			size_t len;
+
+			cp = (char *) realloc (buf, buflen*2);
+			if (NULL == cp) {
+				return NULL;
+			}
+			buf = cp;
+			buflen *= 2;
+
+			len = strlen (buf);
+			if (fgetsx (&buf[len],
+			            (int) (buflen - len),
+			            fp) != &buf[len]) {
+				return NULL;
+			}
+		}
+		cp = strrchr (buf, '\n');
+		if (NULL != cp) {
+			*cp = '\0';
+		}
+#ifdef	USE_NIS
+		if (nis_ignore && IS_NISCHAR (buf[0])) {
+			continue;
+		}
+#endif
+		return (sgetsgent (buf));
+	}
+	return NULL;
+}
+
+/*
+ * getsgent - get a single shadow group entry
+ */
+
+/*@observer@*//*@null@*/struct sgrp *getsgent (void)
+{
+#ifdef	USE_NIS
+	bool nis_1_group = false;
+	struct sgrp *val;
+#endif
+	if (NULL == shadow) {
+		setsgent ();
+	}
+
+#ifdef	USE_NIS
+      again:
+	/*
+	 * See if we are reading from the local file.
+	 */
+
+	if (nis_state == native || nis_state == native2) {
+
+		/*
+		 * Get the next entry from the shadow group file.  Return
+		 * NULL right away if there is none.
+		 */
+
+		val = fgetsgent (shadow);
+		if (NULL == val) {
+			return 0;
+		}
+
+		/*
+		 * If this entry began with a NIS escape character, we have
+		 * to see if this is just a single group, or if the entire
+		 * map is being asked for.
+		 */
+
+		if (IS_NISCHAR (val->sg_name[0])) {
+			if ('\0' != val->sg_name[1]) {
+				nis_1_group = true;
+			} else {
+				nis_state = start;
+			}
+		}
+
+		/*
+		 * If this isn't a NIS group and this isn't an escape to go
+		 * use a NIS map, it must be a regular local group.
+		 */
+
+		if (!nis_1_group && (nis_state != start)) {
+			return val;
+		}
+
+		/*
+		 * If this is an escape to use an NIS map, switch over to
+		 * that bunch of code.
+		 */
+
+		if (nis_state == start) {
+			goto again;
+		}
+
+		/*
+		 * NEEDSWORK.  Here we substitute pieces-parts of this entry.
+		 */
+
+		return 0;
+	} else {
+		if (!nis_bound) {
+			if (bind_nis ()) {
+				nis_state = native2;
+				goto again;
+			}
+		}
+		if (nis_state == start) {
+			if (yp_first (nis_domain, "gshadow.byname", &nis_key,
+				      &nis_keylen, &nis_val, &nis_vallen)) {
+				nis_state = native2;
+				goto again;
+			}
+			nis_state = middle;
+		} else if (nis_state == middle) {
+			if (yp_next (nis_domain, "gshadow.byname", nis_key,
+				     nis_keylen, &nis_key, &nis_keylen,
+				     &nis_val, &nis_vallen)) {
+				nis_state = native2;
+				goto again;
+			}
+		}
+		return sgetsgent (nis_val);
+	}
+#else
+	return (fgetsgent (shadow));
+#endif
+}
+
+/*
+ * getsgnam - get a shadow group entry by name
+ */
+
+/*@observer@*//*@null@*/struct sgrp *getsgnam (const char *name)
+{
+	struct sgrp *sgrp;
+
+#ifdef	USE_NIS
+	static char save_name[16];
+	int nis_disabled = 0;
+#endif
+
+	setsgent ();
+
+#ifdef	USE_NIS
+	if (nis_used) {
+	      again:
+
+		/*
+		 * Search the gshadow.byname map for this group.
+		 */
+
+		if (!nis_bound) {
+			bind_nis ();
+		}
+
+		if (nis_bound) {
+			char *cp;
+
+			if (yp_match (nis_domain, "gshadow.byname", name,
+				      strlen (name), &nis_val,
+				      &nis_vallen) == 0) {
+				cp = strchr (nis_val, '\n');
+				if (NULL != cp) {
+					*cp = '\0';
+				}
+
+				nis_state = middle;
+				sgrp = sgetsgent (nis_val);
+				if (NULL != sgrp) {
+					strcpy (save_name, sgrp->sg_name);
+					nis_key = save_name;
+					nis_keylen = strlen (save_name);
+				}
+				return sgrp;
+			}
+		}
+		nis_state = native2;
+	}
+#endif
+#ifdef	USE_NIS
+	if (nis_used) {
+		nis_ignore = true;
+		nis_disabled = true;
+	}
+#endif
+	while ((sgrp = getsgent ()) != (struct sgrp *) 0) {
+		if (strcmp (name, sgrp->sg_name) == 0) {
+			break;
+		}
+	}
+#ifdef	USE_NIS
+	nis_ignore = false;
+#endif
+	return sgrp;
+}
+
+/*
+ * putsgent - output shadow group entry in text form
+ *
+ * putsgent() converts the contents of a (struct sgrp) to text and
+ * writes the result to the given stream.  This is the logical
+ * opposite of fgetsgent.
+ */
+
+int putsgent (const struct sgrp *sgrp, FILE * fp)
+{
+	char *buf, *cp;
+	int i;
+	size_t size;
+
+	if ((NULL == fp) || (NULL == sgrp)) {
+		return -1;
+	}
+
+	/* calculate the required buffer size */
+	size = strlen (sgrp->sg_name) + strlen (sgrp->sg_passwd) + 10;
+	for (i = 0; (NULL != sgrp->sg_adm) && (NULL != sgrp->sg_adm[i]); i++) {
+		size += strlen (sgrp->sg_adm[i]) + 1;
+	}
+	for (i = 0; (NULL != sgrp->sg_mem) && (NULL != sgrp->sg_mem[i]); i++) {
+		size += strlen (sgrp->sg_mem[i]) + 1;
+	}
+
+	buf = malloc (size);
+	if (NULL == buf) {
+		return -1;
+	}
+	cp = buf;
+
+	/*
+	 * Copy the group name and passwd.
+	 */
+
+	strcpy (cp, sgrp->sg_name);
+	cp += strlen (cp);
+	*cp++ = ':';
+
+	strcpy (cp, sgrp->sg_passwd);
+	cp += strlen (cp);
+	*cp++ = ':';
+
+	/*
+	 * Copy the administrators, separating each from the other
+	 * with a ",".
+	 */
+
+	for (i = 0; NULL != sgrp->sg_adm[i]; i++) {
+		if (i > 0) {
+			*cp++ = ',';
+		}
+
+		strcpy (cp, sgrp->sg_adm[i]);
+		cp += strlen (cp);
+	}
+	*cp = ':';
+	cp++;
+
+	/*
+	 * Now do likewise with the group members.
+	 */
+
+	for (i = 0; NULL != sgrp->sg_mem[i]; i++) {
+		if (i > 0) {
+			*cp = ',';
+			cp++;
+		}
+
+		strcpy (cp, sgrp->sg_mem[i]);
+		cp += strlen (cp);
+	}
+	*cp = '\n';
+	cp++;
+	*cp = '\0';
+
+	/*
+	 * Output using the function which understands the line
+	 * continuation conventions.
+	 */
+
+	if (fputsx (buf, fp) == EOF) {
+		free (buf);
+		return -1;
+	}
+
+	free (buf);
+	return 0;
+}
+#else
+extern int errno;		/* warning: ANSI C forbids an empty source file */
+#endif				/*} SHADOWGRP */
diff --git a/lib/gshadow_.h b/lib/gshadow_.h
new file mode 100644
index 0000000..68a0bb6
--- /dev/null
+++ b/lib/gshadow_.h
@@ -0,0 +1,52 @@
+/*
+ * SPDX-FileCopyrightText: 1988 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1997, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ *	$Id$
+ */
+
+#ifndef	_H_GSHADOW
+#define	_H_GSHADOW
+
+/*
+ * Shadow group security file structure
+ */
+
+struct sgrp {
+	char *sg_name;		/* group name */
+	char *sg_passwd;	/* group password */
+	char **sg_adm;		/* group administrator list */
+	char **sg_mem;		/* group membership list */
+};
+
+/*
+ * Shadow group security file functions.
+ */
+
+#include <stdio.h>		/* for FILE */
+
+#if __STDC__
+/*@observer@*//*@null@*/struct sgrp *getsgent (void);
+/*@observer@*//*@null@*/struct sgrp *getsgnam (const char *);
+/*@observer@*//*@null@*/struct sgrp *sgetsgent (const char *);
+/*@observer@*//*@null@*/struct sgrp *fgetsgent (/*@null@*/FILE *);
+void setsgent (void);
+void endsgent (void);
+int putsgent (const struct sgrp *, FILE *);
+#else
+/*@observer@*//*@null@*/struct sgrp *getsgent ();
+/*@observer@*//*@null@*/struct sgrp *getsgnam ();
+/*@observer@*//*@null@*/struct sgrp *sgetsgent ();
+/*@observer@*//*@null@*/struct sgrp *fgetsgent ();
+void setsgent ();
+void endsgent ();
+int putsgent ();
+#endif
+
+#define	GSHADOW	"/etc/gshadow"
+#endif				/* ifndef _H_GSHADOW */
diff --git a/lib/lockpw.c b/lib/lockpw.c
new file mode 100644
index 0000000..aaa317f
--- /dev/null
+++ b/lib/lockpw.c
@@ -0,0 +1,85 @@
+/*
+ * SPDX-FileCopyrightText: 1992       , Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ifndef HAVE_LCKPWDF
+
+#ident "$Id$"
+
+#include "prototypes.h"
+#include "defines.h"
+#include "pwio.h"
+#include "shadowio.h"
+/*
+ * lckpwdf - lock the password files
+ */
+int lckpwdf (void)
+{
+	int i;
+
+	/*
+	 * We have 15 seconds to lock the whole mess
+	 */
+
+	for (i = 0; i < 15; i++)
+		if (pw_lock ())
+			break;
+		else
+			sleep (1);
+
+	/*
+	 * Did we run out of time?
+	 */
+
+	if (i == 15)
+		return -1;
+
+	/*
+	 * Nope, use any remaining time to lock the shadow password
+	 * file.
+	 */
+
+	for (; i < 15; i++)
+		if (spw_lock ())
+			break;
+		else
+			sleep (1);
+
+	/*
+	 * Out of time yet?
+	 */
+
+	if (i == 15) {
+		pw_unlock ();
+		return -1;
+	}
+
+	/*
+	 * Nope - and both files are now locked.
+	 */
+
+	return 0;
+}
+
+/*
+ * ulckpwdf - unlock the password files
+ */
+
+int ulckpwdf (void)
+{
+
+	/*
+	 * Unlock both files.
+	 */
+
+	return (pw_unlock () && spw_unlock ())? 0 : -1;
+}
+#else
+extern int errno;		/* warning: ANSI C forbids an empty source file */
+#endif
diff --git a/lib/nscd.c b/lib/nscd.c
new file mode 100644
index 0000000..2c2251a
--- /dev/null
+++ b/lib/nscd.c
@@ -0,0 +1,58 @@
+/* Author: Peter Vrabec <pvrabec@redhat.com> */
+
+#include <config.h>
+#ifdef USE_NSCD
+
+#include <stdio.h>
+#include <sys/wait.h>
+#include <sys/types.h>
+#include "exitcodes.h"
+#include "defines.h"
+#include "prototypes.h"
+#include "nscd.h"
+#include "shadowlog_internal.h"
+
+#define MSG_NSCD_FLUSH_CACHE_FAILED "%s: Failed to flush the nscd cache.\n"
+
+/*
+ * nscd_flush_cache - flush specified service buffer in nscd cache
+ */
+int nscd_flush_cache (const char *service)
+{
+	int status, code;
+	const char *cmd = "/usr/sbin/nscd";
+	const char *spawnedArgs[] = {"nscd", "-i", service, NULL};
+	const char *spawnedEnv[] = {NULL};
+
+	if (run_command (cmd, spawnedArgs, spawnedEnv, &status) != 0) {
+		/* run_command writes its own more detailed message. */
+		(void) fprintf (shadow_logfd, _(MSG_NSCD_FLUSH_CACHE_FAILED), shadow_progname);
+		return -1;
+	}
+
+	code = WEXITSTATUS (status);
+	if (!WIFEXITED (status)) {
+		(void) fprintf (shadow_logfd,
+		                _("%s: nscd did not terminate normally (signal %d)\n"),
+		                shadow_progname, WTERMSIG (status));
+		return -1;
+	} else if (code == E_CMD_NOTFOUND) {
+		/* nscd is not installed, or it is installed but uses an
+		   interpreter that is missing.  Probably the former. */
+		return 0;
+	} else if (code == 1) {
+		/* nscd is installed, but it isn't active. */
+		return 0;
+	} else if (code != 0) {
+		(void) fprintf (shadow_logfd, _("%s: nscd exited with status %d\n"),
+		                shadow_progname, code);
+		(void) fprintf (shadow_logfd, _(MSG_NSCD_FLUSH_CACHE_FAILED), shadow_progname);
+		return -1;
+	}
+
+	return 0;
+}
+#else				/* USE_NSCD */
+extern int errno;		/* warning: ANSI C forbids an empty source file */
+#endif				/* USE_NSCD */
+
diff --git a/lib/nscd.h b/lib/nscd.h
new file mode 100644
index 0000000..a430b00
--- /dev/null
+++ b/lib/nscd.h
@@ -0,0 +1,13 @@
+#ifndef _NSCD_H_
+#define _NSCD_H_
+
+/*
+ * nscd_flush_cache - flush specified service buffer in nscd cache
+ */
+#ifdef	USE_NSCD
+extern int nscd_flush_cache (const char *service);
+#else
+#define nscd_flush_cache(service) (0)
+#endif
+
+#endif
diff --git a/lib/nss.c b/lib/nss.c
new file mode 100644
index 0000000..23d0518
--- /dev/null
+++ b/lib/nss.c
@@ -0,0 +1,151 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <dlfcn.h>
+#include <stdbool.h>
+#include <string.h>
+#include <strings.h>
+#include <ctype.h>
+#include <stdatomic.h>
+#include "prototypes.h"
+#include "../libsubid/subid.h"
+#include "shadowlog_internal.h"
+#include "shadowlog.h"
+
+#define NSSWITCH "/etc/nsswitch.conf"
+
+// NSS plugin handling for subids
+// If nsswitch has a line like
+//    subid: sssd
+// then sssd will be consulted for subids.  Unlike normal NSS dbs,
+// only one db is supported at a time.  That's open to debate, but
+// the subids are a pretty limited resource, and local files seem
+// bound to step on any other allocations leading to insecure
+// conditions.
+static atomic_flag nss_init_started;
+static atomic_bool nss_init_completed;
+
+static struct subid_nss_ops *subid_nss;
+
+bool nss_is_initialized() {
+	return atomic_load(&nss_init_completed);
+}
+
+static void nss_exit(void) {
+	if (nss_is_initialized() && subid_nss) {
+		dlclose(subid_nss->handle);
+		free(subid_nss);
+		subid_nss = NULL;
+	}
+}
+
+// nsswitch_path is an argument only to support testing.
+void nss_init(const char *nsswitch_path) {
+	FILE *nssfp = NULL;
+	char *line = NULL, *p, *token, *saveptr;
+	size_t len = 0;
+	FILE *shadow_logfd = log_get_logfd();
+
+	if (atomic_flag_test_and_set(&nss_init_started)) {
+		// Another thread has started nss_init, wait for it to complete
+		while (!atomic_load(&nss_init_completed))
+			usleep(100);
+		return;
+	}
+
+	if (!nsswitch_path)
+		nsswitch_path = NSSWITCH;
+
+	// read nsswitch.conf to check for a line like:
+	//   subid:	files
+	nssfp = fopen(nsswitch_path, "r");
+	if (!nssfp) {
+		atomic_store(&nss_init_completed, true);
+		return;
+	}
+	while ((getline(&line, &len, nssfp)) != -1) {
+		if (line[0] == '\0' || line[0] == '#')
+			continue;
+		if (strlen(line) < 8)
+			continue;
+		if (strncasecmp(line, "subid:", 6) != 0)
+			continue;
+		p = &line[6];
+		while ((*p) && isspace(*p))
+			p++;
+		if (!*p)
+			continue;
+		for (token = strtok_r(p, " \n\t", &saveptr);
+		     token;
+		     token = strtok_r(NULL, " \n\t", &saveptr)) {
+			char libname[65];
+			void *h;
+			if (strcmp(token, "files") == 0) {
+				subid_nss = NULL;
+				goto done;
+			}
+			if (strlen(token) > 50) {
+				fprintf(shadow_logfd, "Subid NSS module name too long (longer than 50 characters): %s\n", token);
+				fprintf(shadow_logfd, "Using files\n");
+				subid_nss = NULL;
+				goto done;
+			}
+			snprintf(libname, 64,  "libsubid_%s.so", token);
+			h = dlopen(libname, RTLD_LAZY);
+			if (!h) {
+				fprintf(shadow_logfd, "Error opening %s: %s\n", libname, dlerror());
+				fprintf(shadow_logfd, "Using files\n");
+				subid_nss = NULL;
+				goto done;
+			}
+			subid_nss = malloc(sizeof(*subid_nss));
+			if (!subid_nss) {
+				dlclose(h);
+				goto done;
+			}
+			subid_nss->has_range = dlsym(h, "shadow_subid_has_range");
+			if (!subid_nss->has_range) {
+				fprintf(shadow_logfd, "%s did not provide @has_range@\n", libname);
+				dlclose(h);
+				free(subid_nss);
+				subid_nss = NULL;
+				goto done;
+			}
+			subid_nss->list_owner_ranges = dlsym(h, "shadow_subid_list_owner_ranges");
+			if (!subid_nss->list_owner_ranges) {
+				fprintf(shadow_logfd, "%s did not provide @list_owner_ranges@\n", libname);
+				dlclose(h);
+				free(subid_nss);
+				subid_nss = NULL;
+				goto done;
+			}
+			subid_nss->find_subid_owners = dlsym(h, "shadow_subid_find_subid_owners");
+			if (!subid_nss->find_subid_owners) {
+				fprintf(shadow_logfd, "%s did not provide @find_subid_owners@\n", libname);
+				dlclose(h);
+				free(subid_nss);
+				subid_nss = NULL;
+				goto done;
+			}
+			subid_nss->handle = h;
+			goto done;
+		}
+		fprintf(shadow_logfd, "No usable subid NSS module found, using files\n");
+		// subid_nss has to be null here, but to ease reviews:
+		free(subid_nss);
+		subid_nss = NULL;
+		goto done;
+	}
+
+done:
+	atomic_store(&nss_init_completed, true);
+	free(line);
+	if (nssfp) {
+		atexit(nss_exit);
+		fclose(nssfp);
+	}
+}
+
+struct subid_nss_ops *get_subid_nss_handle() {
+	nss_init(NULL);
+	return subid_nss;
+}
diff --git a/lib/pam_defs.h b/lib/pam_defs.h
new file mode 100644
index 0000000..2dcda3c
--- /dev/null
+++ b/lib/pam_defs.h
@@ -0,0 +1,35 @@
+/*
+ * SPDX-FileCopyrightText: 1999       , Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001 - 2005, Tomasz Kłoczko
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+#include <security/pam_appl.h>
+#ifdef HAVE_SECURITY_PAM_MISC_H
+# include <security/pam_misc.h>
+#endif
+#ifdef HAVE_SECURITY_OPENPAM_H
+# include <security/openpam.h>
+#endif
+
+
+static struct pam_conv conv = {
+	SHADOW_PAM_CONVERSATION,
+	NULL
+};
+
+/* compatibility with different versions of Linux-PAM */
+#if !HAVE_DECL_PAM_ESTABLISH_CRED
+#define PAM_ESTABLISH_CRED PAM_CRED_ESTABLISH
+#endif
+#if !HAVE_DECL_PAM_DELETE_CRED
+#define PAM_DELETE_CRED PAM_CRED_DELETE
+#endif
+#if !HAVE_DECL_PAM_NEW_AUTHTOK_REQD
+#define PAM_NEW_AUTHTOK_REQD PAM_AUTHTOKEN_REQD
+#endif
+#if !HAVE_DECL_PAM_DATA_SILENT
+#define PAM_DATA_SILENT 0
+#endif
diff --git a/lib/port.c b/lib/port.c
new file mode 100644
index 0000000..0bea2ef
--- /dev/null
+++ b/lib/port.c
@@ -0,0 +1,454 @@
+/*
+ * SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1997, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <stdio.h>
+#include <ctype.h>
+#include <errno.h>
+#include "defines.h"
+#include "prototypes.h"
+#include "port.h"
+
+static FILE *ports;
+
+/*
+ * portcmp - compare the name of a port to a /etc/porttime entry
+ *
+ *	portcmp works like strcmp, except that if the last character
+ *	in a failing match is a '*', the match is considered to have
+ *	passed.  The "*" match is suppressed whenever the port is "SU",
+ *	which is the token the "su" command uses to validate access.
+ *	A match returns 0, failure returns non-zero.
+ */
+
+static int portcmp (const char *pattern, const char *port)
+{
+	const char *orig = port;
+
+	while (('\0' != *pattern) && (*pattern == *port)) {
+		pattern++;
+		port++;
+	}
+
+	if (('\0' == *pattern) && ('\0' == *port)) {
+		return 0;
+	}
+	if (('S' == orig[0]) && ('U' == orig[1]) && ('\0' == orig[2])) {
+		return 1;
+	}
+
+	return (*pattern == '*') ? 0 : 1;
+}
+
+/*
+ * setportent - open /etc/porttime file or rewind
+ *
+ *	the /etc/porttime file is rewound if already open, or
+ *	opened for reading.
+ */
+
+static void setportent (void)
+{
+	if (NULL != ports) {
+		rewind (ports);
+	} else {
+		ports = fopen (PORTS, "r");
+	}
+}
+
+/*
+ * endportent - close the /etc/porttime file
+ *
+ *	the /etc/porttime file is closed and the ports variable set
+ *	to NULL to indicate that the /etc/porttime file is no longer
+ *	open.
+ */
+
+static void endportent (void)
+{
+	if (NULL != ports) {
+		(void) fclose (ports);
+	}
+
+	ports = (FILE *) 0;
+}
+
+/*
+ * getportent - read a single entry from /etc/porttime
+ *
+ *	the next line in /etc/porttime is converted to a (struct port)
+ *	and a pointer to a static (struct port) is returned to the
+ *	invoker.  NULL is returned on either EOF or error.  errno is
+ *	set to EINVAL on error to distinguish the two conditions.
+ */
+
+static struct port *getportent (void)
+{
+	static struct port port;	/* static struct to point to         */
+	static char buf[BUFSIZ];	/* some space for stuff              */
+	static char *ttys[PORT_TTY + 1];	/* some pointers to tty names     */
+	static char *users[PORT_IDS + 1];	/* some pointers to user ids     */
+	static struct pt_time ptimes[PORT_TIMES + 1];	/* time ranges         */
+	char *cp;		/* pointer into line                 */
+	int dtime;		/* scratch time of day               */
+	int i, j;
+	int saveerr = errno;	/* errno value on entry              */
+
+	/*
+	 * If the ports file is not open, open the file.  Do not rewind
+	 * since we want to search from the beginning each time.
+	 */
+
+	if (NULL == ports) {
+		setportent ();
+	}
+
+	if (NULL == ports) {
+		errno = saveerr;
+		return 0;
+	}
+
+	/*
+	 * Common point for beginning a new line -
+	 *
+	 *      - read a line, and NUL terminate
+	 *      - skip lines which begin with '#'
+	 *      - parse off the tty names
+	 *      - parse off a list of user names
+	 *      - parse off a list of days and times
+	 */
+
+      again:
+
+	/*
+	 * Get the next line and remove the last character, which
+	 * is a '\n'.  Lines which begin with '#' are all ignored.
+	 */
+
+	if (fgets (buf, (int) sizeof buf, ports) == 0) {
+		errno = saveerr;
+		return 0;
+	}
+	if ('#' == buf[0]) {
+		goto again;
+	}
+
+	/*
+	 * Get the name of the TTY device.  It is the first colon
+	 * separated field, and is the name of the TTY with no
+	 * leading "/dev".  The entry '*' is used to specify all
+	 * TTY devices.
+	 */
+
+	buf[strlen (buf) - 1] = 0;
+
+	port.pt_names = ttys;
+	for (cp = buf, j = 0; j < PORT_TTY; j++) {
+		port.pt_names[j] = cp;
+		while (('\0' != *cp) && (':' != *cp) && (',' != *cp)) {
+			cp++;
+		}
+
+		if ('\0' == *cp) {
+			goto again;	/* line format error */
+		}
+
+		if (':' == *cp) {	/* end of tty name list */
+			break;
+		}
+
+		if (',' == *cp) {	/* end of current tty name */
+			*cp++ = '\0';
+		}
+	}
+	*cp = '\0';
+	cp++;
+	port.pt_names[j + 1] = (char *) 0;
+
+	/*
+	 * Get the list of user names.  It is the second colon
+	 * separated field, and is a comma separated list of user
+	 * names.  The entry '*' is used to specify all usernames.
+	 * The last entry in the list is a (char *) 0 pointer.
+	 */
+
+	if (':' != *cp) {
+		port.pt_users = users;
+		port.pt_users[0] = cp;
+
+		for (j = 1; ':' != *cp; cp++) {
+			if ((',' == *cp) && (j < PORT_IDS)) {
+				*cp = '\0';
+				cp++;
+				port.pt_users[j] = cp;
+				j++;
+			}
+		}
+		port.pt_users[j] = 0;
+	} else {
+		port.pt_users = 0;
+	}
+
+	if (':' != *cp) {
+		goto again;
+	}
+
+	*cp = '\0';
+	cp++;
+
+	/*
+	 * Get the list of valid times.  The times field is the third
+	 * colon separated field and is a list of days of the week and
+	 * times during which this port may be used by this user.  The
+	 * valid days are 'Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', and 'Sa'.
+	 *
+	 * In addition, the value 'Al' represents all 7 days, and 'Wk'
+	 * represents the 5 weekdays.
+	 *
+	 * Times are given as HHMM-HHMM.  The ending time may be before
+	 * the starting time.  Days are presumed to wrap at 0000.
+	 */
+
+	if ('\0' == *cp) {
+		port.pt_times = 0;
+		return &port;
+	}
+
+	port.pt_times = ptimes;
+
+	/*
+	 * Get the next comma separated entry
+	 */
+
+	for (j = 0; ('\0' != *cp) && (j < PORT_TIMES); j++) {
+
+		/*
+		 * Start off with no days of the week
+		 */
+
+		port.pt_times[j].t_days = 0;
+
+		/*
+		 * Check each two letter sequence to see if it is
+		 * one of the abbreviations for the days of the
+		 * week or the other two values.
+		 */
+
+		for (i = 0;
+		     ('\0' != cp[i]) && ('\0' != cp[i + 1]) && isalpha (cp[i]);
+		     i += 2) {
+			switch ((cp[i] << 8) | (cp[i + 1])) {
+			case ('S' << 8) | 'u':
+				port.pt_times[j].t_days |= 01;
+				break;
+			case ('M' << 8) | 'o':
+				port.pt_times[j].t_days |= 02;
+				break;
+			case ('T' << 8) | 'u':
+				port.pt_times[j].t_days |= 04;
+				break;
+			case ('W' << 8) | 'e':
+				port.pt_times[j].t_days |= 010;
+				break;
+			case ('T' << 8) | 'h':
+				port.pt_times[j].t_days |= 020;
+				break;
+			case ('F' << 8) | 'r':
+				port.pt_times[j].t_days |= 040;
+				break;
+			case ('S' << 8) | 'a':
+				port.pt_times[j].t_days |= 0100;
+				break;
+			case ('W' << 8) | 'k':
+				port.pt_times[j].t_days |= 076;
+				break;
+			case ('A' << 8) | 'l':
+				port.pt_times[j].t_days |= 0177;
+				break;
+			default:
+				errno = EINVAL;
+				return 0;
+			}
+		}
+
+		/*
+		 * The default is 'Al' if no days were seen.
+		 */
+
+		if (0 == i) {
+			port.pt_times[j].t_days = 0177;
+		}
+
+		/*
+		 * The start and end times are separated from each
+		 * other by a '-'.  The times are four digit numbers
+		 * representing the times of day.
+		 */
+
+		for (dtime = 0; ('\0' != cp[i]) && isdigit (cp[i]); i++) {
+			dtime = dtime * 10 + cp[i] - '0';
+		}
+
+		if (('-' != cp[i]) || (dtime > 2400) || ((dtime % 100) > 59)) {
+			goto again;
+		}
+		port.pt_times[j].t_start = dtime;
+		cp = cp + i + 1;
+
+		for (dtime = 0, i = 0;
+		     ('\0' != cp[i]) && isdigit (cp[i]);
+		     i++) {
+			dtime = dtime * 10 + cp[i] - '0';
+		}
+
+		if (   ((',' != cp[i]) && ('\0' != cp[i]))
+		    || (dtime > 2400)
+		    || ((dtime % 100) > 59)) {
+			goto again;
+		}
+
+		port.pt_times[j].t_end = dtime;
+		cp = cp + i + 1;
+	}
+
+	/*
+	 * The end of the list is indicated by a pair of -1's for the
+	 * start and end times.
+	 */
+
+	port.pt_times[j].t_start = port.pt_times[j].t_end = -1;
+
+	return &port;
+}
+
+/*
+ * getttyuser - get ports information for user and tty
+ *
+ *	getttyuser() searches the ports file for an entry with a TTY
+ *	and user field both of which match the supplied TTY and
+ *	user name.  The file is searched from the beginning, so the
+ *	entries are treated as an ordered list.
+ */
+
+static struct port *getttyuser (const char *tty, const char *user)
+{
+	int i, j;
+	struct port *port;
+
+	setportent ();
+
+	while ((port = getportent ()) != NULL) {
+		if (   (0 == port->pt_names)
+		    || (0 == port->pt_users)) {
+			continue;
+		}
+
+		for (i = 0; NULL != port->pt_names[i]; i++) {
+			if (portcmp (port->pt_names[i], tty) == 0) {
+				break;
+			}
+		}
+
+		if (port->pt_names[i] == 0) {
+			continue;
+		}
+
+		for (j = 0; NULL != port->pt_users[j]; j++) {
+			if (   (strcmp (user, port->pt_users[j]) == 0)
+			    || (strcmp (port->pt_users[j], "*") == 0)) {
+				break;
+			}
+		}
+
+		if (port->pt_users[j] != 0) {
+			break;
+		}
+	}
+	endportent ();
+	return port;
+}
+
+/*
+ * isttytime - tell if a given user may login at a particular time
+ *
+ *	isttytime searches the ports file for an entry which matches
+ *	the user name and TTY given.
+ */
+
+bool isttytime (const char *id, const char *port, time_t when)
+{
+	int i;
+	int dtime;
+	struct port *pp;
+	struct tm *tm;
+
+	/*
+	 * Try to find a matching entry for this user.  Default to
+	 * letting the user in - there are plenty of ways to have an
+	 * entry to match all users.
+	 */
+
+	pp = getttyuser (port, id);
+	if (NULL == pp) {
+		return true;
+	}
+
+	/*
+	 * The entry is there, but has no time entries - don't
+	 * ever let them login.
+	 */
+
+	if (0 == pp->pt_times) {
+		return false;
+	}
+
+	/*
+	 * The current time is converted to HHMM format for
+	 * comparison against the time values in the TTY entry.
+	 */
+
+	tm = localtime (&when);
+	dtime = tm->tm_hour * 100 + tm->tm_min;
+
+	/*
+	 * Each time entry is compared against the current
+	 * time.  For entries with the start after the end time,
+	 * the comparison is made so that the time is between
+	 * midnight and either the start or end time.
+	 */
+
+	for (i = 0; pp->pt_times[i].t_start != -1; i++) {
+		if (!(pp->pt_times[i].t_days & PORT_DAY (tm->tm_wday))) {
+			continue;
+		}
+
+		if (pp->pt_times[i].t_start <= pp->pt_times[i].t_end) {
+			if (   (dtime >= pp->pt_times[i].t_start)
+			    && (dtime <= pp->pt_times[i].t_end)) {
+				return true;
+			}
+		} else {
+			if (   (dtime >= pp->pt_times[i].t_start)
+			    || (dtime <= pp->pt_times[i].t_end)) {
+				return true;
+			}
+		}
+	}
+
+	/*
+	 * No matching time entry was found, user shouldn't
+	 * be let in right now.
+	 */
+
+	return false;
+}
+
diff --git a/lib/port.h b/lib/port.h
new file mode 100644
index 0000000..c19421d
--- /dev/null
+++ b/lib/port.h
@@ -0,0 +1,60 @@
+/*
+ * SPDX-FileCopyrightText: 1989 - 1991, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1997, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * port.h - structure of /etc/porttime
+ *
+ *	$Id$
+ *
+ *	Each entry in /etc/porttime consists of a TTY device
+ *	name or "*" to indicate all TTY devices, followed by
+ *	a list of 1 or more user IDs or "*" to indicate all
+ *	user names, followed by a list of zero or more valid
+ *	login times.  Login time entries consist of zero or
+ *	more day names (Su, Mo, Tu, We, Th, Fr, Sa, Wk, Al)
+ *	followed by a pair of time values in HHMM format
+ *	separated by a "-".
+ */
+
+/*
+ * PORTS - Name of system port access time file.
+ * PORT_IDS - Allowable number of IDs per entry.
+ * PORT_TTY - Allowable number of TTYs per entry.
+ * PORT_TIMES - Allowable number of time entries per entry.
+ * PORT_DAY - Day of the week to a bit value (0 = Sunday).
+ */
+
+#define	PORTS	"/etc/porttime"
+#define	PORT_IDS	64
+#define	PORT_TTY	64
+#define	PORT_TIMES	24
+#define	PORT_DAY(day)	(1<<(day))
+
+/*
+ *	pt_names - pointer to array of device names in /dev/
+ *	pt_users - pointer to array of applicable user IDs.
+ *	pt_times - pointer to list of allowable time periods.
+ */
+
+struct port {
+	char **pt_names;
+	char **pt_users;
+	struct pt_time *pt_times;
+};
+
+/*
+ *	t_days - bit array for each day of the week (0 = Sunday)
+ *	t_start - starting time for this entry
+ *	t_end - ending time for this entry
+ */
+
+struct pt_time {
+	short t_days;
+	short t_start;
+	short t_end;
+};
diff --git a/lib/prototypes.h b/lib/prototypes.h
new file mode 100644
index 0000000..1172b5d
--- /dev/null
+++ b/lib/prototypes.h
@@ -0,0 +1,501 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2010, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * prototypes.h
+ *
+ * prototypes of libmisc functions, and private lib functions.
+ *
+ * $Id$
+ *
+ */
+
+#ifndef _PROTOTYPES_H
+#define _PROTOTYPES_H
+
+#include <config.h>
+
+#include <sys/stat.h>
+#ifdef USE_UTMPX
+#include <utmpx.h>
+#else
+#include <utmp.h>
+#endif
+#include <sys/types.h>
+#include <pwd.h>
+#include <grp.h>
+#include <shadow.h>
+#include <lastlog.h>
+
+#include "defines.h"
+#include "commonio.h"
+
+/* addgrps.c */
+#if defined (HAVE_SETGROUPS) && ! defined (USE_PAM)
+extern int add_groups (const char *);
+#endif
+
+/* age.c */
+extern void agecheck (/*@null@*/const struct spwd *);
+extern int expire (const struct passwd *, /*@null@*/const struct spwd *);
+/* isexpired.c */
+extern int isexpired (const struct passwd *, /*@null@*/const struct spwd *);
+
+/* btrfs.c */
+#ifdef WITH_BTRFS
+extern int btrfs_create_subvolume(const char *path);
+extern int btrfs_remove_subvolume(const char *path);
+extern int btrfs_is_subvolume(const char *path);
+extern int is_btrfs(const char *path);
+#endif
+
+/* basename() renamed to Basename() to avoid libc name space confusion */
+/* basename.c */
+extern /*@observer@*/const char *Basename (const char *str);
+
+/* chowndir.c */
+extern int chown_tree (const char *root,
+                       uid_t old_uid, uid_t new_uid,
+                       gid_t old_gid, gid_t new_gid);
+
+/* chowntty.c */
+extern void chown_tty (const struct passwd *);
+
+/* cleanup.c */
+typedef /*@null@*/void (*cleanup_function) (/*@null@*/void *arg);
+void add_cleanup (/*@notnull@*/cleanup_function pcf, /*@null@*/void *arg);
+void del_cleanup (/*@notnull@*/cleanup_function pcf);
+void do_cleanups (void);
+
+/* cleanup_group.c */
+struct cleanup_info_mod {
+	char *audit_msg;
+	char *action;
+	/*@observer@*/const char *name;
+};
+void cleanup_report_add_group (void *group_name);
+void cleanup_report_add_group_group (void *group_name);
+#ifdef SHADOWGRP
+void cleanup_report_add_group_gshadow (void *group_name);
+#endif
+void cleanup_report_del_group (void *group_name);
+void cleanup_report_del_group_group (void *group_name);
+#ifdef SHADOWGRP
+void cleanup_report_del_group_gshadow (void *group_name);
+#endif
+void cleanup_report_mod_passwd (void *cleanup_info);
+void cleanup_report_mod_group (void *cleanup_info);
+void cleanup_report_mod_gshadow (void *cleanup_info);
+void cleanup_unlock_group (/*@null@*/void *unused);
+#ifdef SHADOWGRP
+void cleanup_unlock_gshadow (/*@null@*/void *unused);
+#endif
+void cleanup_unlock_passwd (/*@null@*/void *unused);
+
+/* console.c */
+extern bool console (const char *);
+
+/* copydir.c */
+extern int copy_tree (const char *src_root, const char *dst_root,
+                      bool copy_root,
+                      bool reset_selinux,
+                      uid_t old_uid, uid_t new_uid,
+                      gid_t old_gid, gid_t new_gid);
+
+/* date_to_str.c */
+extern void date_to_str (size_t size, char buf[size], long date);
+
+/* encrypt.c */
+extern /*@exposed@*//*@null@*/char *pw_encrypt (const char *, const char *);
+
+/* entry.c */
+extern void pw_entry (const char *, struct passwd *);
+
+/* env.c */
+extern void addenv (const char *, /*@null@*/const char *);
+extern void initenv (void);
+extern void set_env (int, char *const *);
+extern void sanitize_env (void);
+
+/* fields.c */
+extern void change_field (char *, size_t, const char *);
+extern int valid_field (const char *, const char *);
+
+/* find_new_gid.c */
+extern int find_new_gid (bool sys_group,
+                         gid_t *gid,
+                         /*@null@*/gid_t const *preferred_gid);
+
+/* find_new_uid.c */
+extern int find_new_uid (bool sys_user,
+                         uid_t *uid,
+                         /*@null@*/uid_t const *preferred_uid);
+
+#ifdef ENABLE_SUBIDS
+/* find_new_sub_gids.c */
+extern int find_new_sub_gids (gid_t *range_start, unsigned long *range_count);
+
+/* find_new_sub_uids.c */
+extern int find_new_sub_uids (uid_t *range_start, unsigned long *range_count);
+#endif				/* ENABLE_SUBIDS */
+
+
+/* get_gid.c */
+extern int get_gid (const char *gidstr, gid_t *gid);
+
+/* getgr_nam_gid.c */
+extern /*@only@*//*@null@*/struct group *getgr_nam_gid (/*@null@*/const char *grname);
+
+/* getlong.c */
+extern int getlong (const char *numstr, /*@out@*/long int *result);
+
+/* get_pid.c */
+extern int get_pid (const char *pidstr, pid_t *pid);
+
+/* getrange */
+extern int getrange (const char *range,
+                     unsigned long *min, bool *has_min,
+                     unsigned long *max, bool *has_max);
+
+/* gettime.c */
+extern time_t gettime (void);
+
+/* get_uid.c */
+extern int get_uid (const char *uidstr, uid_t *uid);
+
+/* getulong.c */
+extern int getulong (const char *numstr, /*@out@*/unsigned long int *result);
+
+/* fputsx.c */
+extern /*@null@*/char *fgetsx (/*@returned@*/ /*@out@*/char *, int, FILE *);
+extern int fputsx (const char *, FILE *);
+
+/* groupio.c */
+extern void __gr_del_entry (const struct commonio_entry *ent);
+extern /*@observer@*/const struct commonio_db *__gr_get_db (void);
+extern /*@dependent@*/ /*@null@*/struct commonio_entry *__gr_get_head (void);
+extern void __gr_set_changed (void);
+
+/* groupmem.c */
+extern /*@null@*/ /*@only@*/struct group *__gr_dup (const struct group *grent);
+extern void gr_free_members (struct group *grent);
+extern void gr_free (/*@out@*/ /*@only@*/struct group *grent);
+extern bool gr_append_member (struct group *grp, char *member);
+
+/* hushed.c */
+extern bool hushed (const char *username);
+
+/* audit_help.c */
+#ifdef WITH_AUDIT
+extern int audit_fd;
+extern void audit_help_open (void);
+/* Use AUDIT_NO_ID when a name is provided to audit_logger instead of an ID */
+#define AUDIT_NO_ID	((unsigned int) -1)
+typedef enum {
+	SHADOW_AUDIT_FAILURE = 0,
+	SHADOW_AUDIT_SUCCESS = 1} shadow_audit_result;
+extern void audit_logger (int type, const char *pgname, const char *op,
+                          const char *name, unsigned int id,
+                          shadow_audit_result result);
+void audit_logger_message (const char *message, shadow_audit_result result);
+#endif
+
+/* limits.c */
+#ifndef USE_PAM
+extern void setup_limits (const struct passwd *);
+#endif
+
+/* list.c */
+extern /*@only@*/ /*@out@*/char **add_list (/*@returned@*/ /*@only@*/char **, const char *);
+extern /*@only@*/ /*@out@*/char **del_list (/*@returned@*/ /*@only@*/char **, const char *);
+extern /*@only@*/ /*@out@*/char **dup_list (char *const *);
+extern bool is_on_list (char *const *list, const char *member);
+extern /*@only@*/char **comma_to_list (const char *);
+
+/* log.c */
+extern void dolastlog (
+	struct lastlog *ll,
+	const struct passwd *pw,
+	/*@unique@*/const char *line,
+	/*@unique@*/const char *host);
+
+/* login_nopam.c */
+extern int login_access (const char *user, const char *from);
+
+/* loginprompt.c */
+extern void login_prompt (const char *, char *, int);
+
+/* mail.c */
+extern void mailcheck (void);
+
+/* motd.c */
+extern void motd (void);
+
+/* myname.c */
+extern /*@null@*//*@only@*/struct passwd *get_my_pwent (void);
+
+/* nss.c */
+#include <libsubid/subid.h>
+extern void nss_init(const char *nsswitch_path);
+extern bool nss_is_initialized(void);
+
+struct subid_nss_ops {
+	/*
+	 * nss_has_range: does a user own a given subid range
+	 *
+	 * @owner: username
+	 * @start: first subid in queried range
+	 * @count: number of subids in queried range
+	 * @idtype: subuid or subgid
+	 * @result: true if @owner has been allocated the subid range.
+	 *
+	 * returns success if the module was able to determine an answer (true or false),
+	 * else an error status.
+	 */
+	enum subid_status (*has_range)(const char *owner, unsigned long start, unsigned long count, enum subid_type idtype, bool *result);
+
+	/*
+	 * nss_list_owner_ranges: list the subid ranges delegated to a user.
+	 *
+	 * @owner - string representing username being queried
+	 * @id_type - subuid or subgid
+	 * @ranges - pointer to an array of struct subid_range, or NULL.  The
+	 *           returned array must be freed by the caller.
+	 * @count - pointer to an integer into which the number of returned ranges
+	 *          is written.
+
+	 * returns success if the module was able to determine an answer,
+	 * else an error status.
+	 */
+	enum subid_status (*list_owner_ranges)(const char *owner, enum subid_type id_type, struct subid_range **ranges, int *count);
+
+	/*
+	 * nss_find_subid_owners: find uids who own a given subuid or subgid.
+	 *
+	 * @id - the delegated id (subuid or subgid) being queried
+	 * @id_type - subuid or subgid
+	 * @uids - pointer to an array of uids which will be allocated by
+	 *         nss_find_subid_owners()
+	 * @count - number of uids found
+	 *
+	 * returns success if the module was able to determine an answer,
+	 * else an error status.
+	 */
+	enum subid_status (*find_subid_owners)(unsigned long id, enum subid_type id_type, uid_t **uids, int *count);
+
+	/* The dlsym handle to close */
+	void *handle;
+};
+
+extern struct subid_nss_ops *get_subid_nss_handle(void);
+
+
+/* pam_pass_non_interactive.c */
+#ifdef USE_PAM
+extern int do_pam_passwd_non_interactive (const char *pam_service,
+                                           const char *username,
+                                           const char* password);
+#endif				/* USE_PAM */
+
+/* obscure.c */
+#ifndef USE_PAM
+extern bool obscure (const char *, const char *, const struct passwd *);
+#endif
+
+/* pam_pass.c */
+#ifdef USE_PAM
+extern void do_pam_passwd (const char *user, bool silent, bool change_expired);
+#endif
+
+/* port.c */
+extern bool isttytime (const char *, const char *, time_t);
+
+/* prefix_flag.c */
+extern const char* process_prefix_flag (const char* short_opt, int argc, char **argv);
+extern struct group *prefix_getgrnam(const char *name);
+extern struct group *prefix_getgrgid(gid_t gid);
+extern struct passwd *prefix_getpwuid(uid_t uid);
+extern struct passwd *prefix_getpwnam(const char* name);
+extern struct spwd *prefix_getspnam(const char* name);
+extern struct group *prefix_getgr_nam_gid(const char *grname);
+extern void prefix_setpwent(void);
+extern struct passwd* prefix_getpwent(void);
+extern void prefix_endpwent(void);
+extern void prefix_setgrent(void);
+extern struct group* prefix_getgrent(void);
+extern void prefix_endgrent(void);
+
+/* pwd2spwd.c */
+#ifndef USE_PAM
+extern struct spwd *pwd_to_spwd (const struct passwd *);
+#endif
+
+/* pwdcheck.c */
+#ifndef USE_PAM
+extern void passwd_check (const char *, const char *, const char *);
+#endif
+
+/* pwd_init.c */
+extern void pwd_init (void);
+
+/* pwio.c */
+extern void __pw_del_entry (const struct commonio_entry *ent);
+extern struct commonio_db *__pw_get_db (void);
+extern /*@dependent@*/ /*@null@*/struct commonio_entry *__pw_get_head (void);
+
+/* pwmem.c */
+extern /*@null@*/ /*@only@*/struct passwd *__pw_dup (const struct passwd *pwent);
+extern void pw_free (/*@out@*/ /*@only@*/struct passwd *pwent);
+
+/* remove_tree.c */
+extern int remove_tree (const char *root, bool remove_root);
+
+/* rlogin.c */
+extern int do_rlogin (const char *remote_host, char *name, size_t namelen,
+                      char *term, size_t termlen);
+
+/* root_flag.c */
+extern void process_root_flag (const char* short_opt, int argc, char **argv);
+
+/* salt.c */
+extern /*@observer@*/const char *crypt_make_salt (/*@null@*//*@observer@*/const char *meth, /*@null@*/void *arg);
+
+/* selinux.c */
+#ifdef WITH_SELINUX
+extern int set_selinux_file_context (const char *dst_name, mode_t mode);
+extern void reset_selinux_handle (void);
+extern int reset_selinux_file_context (void);
+extern int check_selinux_permit (const char *perm_name);
+#endif
+
+/* semanage.c */
+#ifdef WITH_SELINUX
+extern int set_seuser(const char *login_name, const char *seuser_name);
+extern int del_seuser(const char *login_name);
+#endif
+
+/* setugid.c */
+extern int setup_groups (const struct passwd *info);
+extern int change_uid (const struct passwd *info);
+#if (defined HAVE_INITGROUPS) && (! defined USE_PAM)
+extern int setup_uid_gid (const struct passwd *info, bool is_console);
+#else
+extern int setup_uid_gid (const struct passwd *info);
+#endif
+
+/* setup.c */
+extern void setup (struct passwd *);
+
+/* setupenv.c */
+extern void setup_env (struct passwd *);
+
+/* sgetgrent.c */
+extern struct group *sgetgrent (const char *buf);
+
+/* sgetpwent.c */
+extern struct passwd *sgetpwent (const char *buf);
+
+/* sgetspent.c */
+#ifndef HAVE_SGETSPENT
+extern struct spwd *sgetspent (const char *string);
+#endif
+
+/* sgroupio.c */
+extern void __sgr_del_entry (const struct commonio_entry *ent);
+extern /*@null@*/ /*@only@*/struct sgrp *__sgr_dup (const struct sgrp *sgent);
+extern void sgr_free (/*@out@*/ /*@only@*/struct sgrp *sgent);
+extern /*@dependent@*/ /*@null@*/struct commonio_entry *__sgr_get_head (void);
+extern void __sgr_set_changed (void);
+
+/* shadowio.c */
+extern /*@dependent@*/ /*@null@*/struct commonio_entry *__spw_get_head (void);
+extern void __spw_del_entry (const struct commonio_entry *ent);
+
+/* shadowmem.c */
+extern /*@null@*/ /*@only@*/struct spwd *__spw_dup (const struct spwd *spent);
+extern void spw_free (/*@out@*/ /*@only@*/struct spwd *spent);
+
+/* shell.c */
+extern int shell (const char *file, /*@null@*/const char *arg, char *const envp[]);
+
+/* spawn.c */
+extern int run_command (const char *cmd, const char *argv[],
+                        /*@null@*/const char *envp[], /*@out@*/int *status);
+
+/* strtoday.c */
+extern long strtoday (const char *);
+
+/* suauth.c */
+extern int check_su_auth (const char *actual_id,
+                          const char *wanted_id,
+                          bool su_to_root);
+
+/* sulog.c */
+extern void sulog (const char *tty,
+                   bool success,
+                   const char *oldname,
+                   const char *name);
+
+/* sub.c */
+extern void subsystem (const struct passwd *);
+
+/* ttytype.c */
+extern void ttytype (const char *);
+
+/* tz.c */
+#ifndef USE_PAM
+extern /*@observer@*/const char *tz (const char *);
+#endif
+
+/* ulimit.c */
+extern int set_filesize_limit (int blocks);
+
+/* user_busy.c */
+extern int user_busy (const char *name, uid_t uid);
+
+/* utmp.c */
+#ifndef USE_UTMPX
+extern /*@null@*/struct utmp *get_current_utmp (void);
+extern struct utmp *prepare_utmp (const char *name,
+                                  const char *line,
+                                  const char *host,
+                                  /*@null@*/const struct utmp *ut);
+extern int setutmp (struct utmp *ut);
+#else
+extern /*@null@*/struct utmpx *get_current_utmp (void);
+extern struct utmpx *prepare_utmpx (const char *name,
+                                    const char *line,
+                                    const char *host,
+                                    /*@null@*/const struct utmpx *ut);
+extern int setutmpx (struct utmpx *utx);
+#endif				/* USE_UTMPX */
+
+/* valid.c */
+extern bool valid (const char *, const struct passwd *);
+
+/* xmalloc.c */
+extern /*@maynotreturn@*/ /*@only@*//*@out@*//*@notnull@*/void *xmalloc (size_t size)
+  /*@ensures MaxSet(result) == (size - 1); @*/;
+extern /*@maynotreturn@*/ /*@only@*//*@notnull@*/char *xstrdup (const char *);
+
+/* xgetpwnam.c */
+extern /*@null@*/ /*@only@*/struct passwd *xgetpwnam (const char *);
+/* xgetpwuid.c */
+extern /*@null@*/ /*@only@*/struct passwd *xgetpwuid (uid_t);
+/* xgetgrnam.c */
+extern /*@null@*/ /*@only@*/struct group *xgetgrnam (const char *);
+/* xgetgrgid.c */
+extern /*@null@*/ /*@only@*/struct group *xgetgrgid (gid_t);
+/* xgetspnam.c */
+extern /*@null@*/ /*@only@*/struct spwd *xgetspnam(const char *);
+
+/* yesno.c */
+extern bool yes_or_no (bool read_only);
+
+#endif				/* _PROTOTYPES_H */
diff --git a/lib/pwauth.c b/lib/pwauth.c
new file mode 100644
index 0000000..62de472
--- /dev/null
+++ b/lib/pwauth.c
@@ -0,0 +1,211 @@
+/*
+ * SPDX-FileCopyrightText: 1992 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008 - 2009, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ifndef USE_PAM
+#ident "$Id$"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include "prototypes.h"
+#include "defines.h"
+#include "pwauth.h"
+#include "getdef.h"
+#ifdef SKEY
+#include <skey.h>
+#endif
+#ifdef __linux__		/* standard password prompt by default */
+static const char *PROMPT = gettext_noop ("Password: ");
+#else
+static const char *PROMPT = gettext_noop ("%s's Password: ");
+#endif
+
+bool wipe_clear_pass = true;
+/*@null@*/char *clear_pass = NULL;
+
+/*
+ * pw_auth - perform getpass/crypt authentication
+ *
+ *	pw_auth gets the user's cleartext password and encrypts it
+ *	using the salt in the encrypted password. The results are
+ *	compared.
+ */
+
+int pw_auth (const char *cipher,
+             const char *user,
+             int reason,
+             /*@null@*/const char *input)
+{
+	char prompt[1024];
+	char *clear = NULL;
+	const char *cp;
+	const char *encrypted;
+	int retval;
+
+#ifdef	SKEY
+	bool use_skey = false;
+	char challenge_info[40];
+	struct skey skey;
+#endif
+
+	/*
+	 * There are programs for adding and deleting authentication data.
+	 */
+
+	if ((PW_ADD == reason) || (PW_DELETE == reason)) {
+		return 0;
+	}
+
+	/*
+	 * There are even programs for changing the user name ...
+	 */
+
+	if ((PW_CHANGE == reason) && (NULL != input)) {
+		return 0;
+	}
+
+	/*
+	 * WARNING:
+	 *
+	 * When we change a password and we are root, we don't prompt.
+	 * This is so root can change any password without having to
+	 * know it.  This is a policy decision that might have to be
+	 * revisited.
+	 */
+
+	if ((PW_CHANGE == reason) && (getuid () == 0)) {
+		return 0;
+	}
+
+	/*
+	 * WARNING:
+	 *
+	 * When we are logging in a user with no ciphertext password,
+	 * we don't prompt for the password or anything.  In reality
+	 * the user could just hit <ENTER>, so it doesn't really
+	 * matter.
+	 */
+
+	if ((NULL == cipher) || ('\0' == *cipher)) {
+		return 0;
+	}
+
+#ifdef	SKEY
+	/*
+	 * If the user has an S/KEY entry show them the pertinent info
+	 * and then we can try validating the created ciphertext and the SKEY.
+	 * If there is no SKEY information we default to not using SKEY.
+	 */
+
+# ifdef SKEY_BSD_STYLE
+	/*
+	 * Some BSD updates to the S/KEY API adds a fourth parameter; the
+	 * sizeof of the challenge info buffer.
+	 */
+#  define skeychallenge(s,u,c) skeychallenge(s,u,c,sizeof(c))
+# endif
+
+	if (skeychallenge (&skey, user, challenge_info) == 0) {
+		use_skey = true;
+	}
+#endif
+
+	/*
+	 * Prompt for the password as required.  FTPD and REXECD both
+	 * get the cleartext password for us.
+	 */
+
+	if ((PW_FTP != reason) && (PW_REXEC != reason) && (NULL == input)) {
+		cp = getdef_str ("LOGIN_STRING");
+		if (NULL == cp) {
+			cp = _(PROMPT);
+		}
+#ifdef	SKEY
+		if (use_skey) {
+			printf ("[%s]\n", challenge_info);
+		}
+#endif
+
+		snprintf (prompt, sizeof prompt, cp, user);
+		clear = getpass (prompt);
+		if (NULL == clear) {
+			static char c[1];
+
+			c[0] = '\0';
+			clear = c;
+		}
+		input = clear;
+	}
+
+	/*
+	 * Convert the cleartext password into a ciphertext string.
+	 * If the two match, the return value will be zero, which is
+	 * SUCCESS. Otherwise we see if SKEY is being used and check
+	 * the results there as well.
+	 */
+
+	encrypted = pw_encrypt (input, cipher);
+	if (NULL != encrypted) {
+		retval = strcmp (encrypted, cipher);
+	} else {
+		retval = -1;
+	}
+
+#ifdef  SKEY
+	/*
+	 * If (1) The password fails to match, and
+	 * (2) The password is empty and
+	 * (3) We are using OPIE or S/Key, then
+	 * ...Re-prompt, with echo on.
+	 * -- AR 8/22/1999
+	 */
+	if ((0 != retval) && ('\0' == input[0]) && use_skey) {
+		clear = getpass (prompt);
+		if (NULL == clear) {
+			static char c[1];
+
+			c[0] = '\0';
+			clear = c;
+		}
+		input = clear;
+	}
+
+	if ((0 != retval) && use_skey) {
+		int passcheck = -1;
+
+		if (skeyverify (&skey, input) == 0) {
+			passcheck = skey.n;
+		}
+		if (passcheck > 0) {
+			retval = 0;
+		}
+	}
+#endif
+
+	/*
+	 * Things like RADIUS authentication may need the password -
+	 * if the external variable wipe_clear_pass is zero, we will
+	 * not wipe it (the caller should wipe clear_pass when it is
+	 * no longer needed).  --marekm
+	 */
+
+	clear_pass = clear;
+	if (wipe_clear_pass && (NULL != clear) && ('\0' != *clear)) {
+		strzero (clear);
+	}
+	return retval;
+}
+#else				/* !USE_PAM */
+extern int errno;		/* warning: ANSI C forbids an empty source file */
+#endif				/* !USE_PAM */
diff --git a/lib/pwauth.h b/lib/pwauth.h
new file mode 100644
index 0000000..b610025
--- /dev/null
+++ b/lib/pwauth.h
@@ -0,0 +1,48 @@
+/*
+ * SPDX-FileCopyrightText: 1992 - 1993, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1997, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2009       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ *	$Id$
+ */
+
+#ifndef _PWAUTH_H
+#define _PWAUTH_H
+
+#ifndef USE_PAM
+int pw_auth (const char *cipher,
+             const char *user,
+             int flag,
+             /*@null@*/const char *input);
+#endif				/* !USE_PAM */
+
+/*
+ * Local access
+ */
+
+#define	PW_SU		1
+#define	PW_LOGIN	2
+
+/*
+ * Administrative functions
+ */
+
+#define	PW_ADD		101
+#define	PW_CHANGE	102
+#define	PW_DELETE	103
+
+/*
+ * Network access
+ */
+
+#define	PW_TELNET	201
+#define	PW_RLOGIN	202
+#define	PW_FTP		203
+#define	PW_REXEC	204
+
+#endif /* _PWAUTH_H */
diff --git a/lib/pwio.c b/lib/pwio.c
new file mode 100644
index 0000000..e59b473
--- /dev/null
+++ b/lib/pwio.c
@@ -0,0 +1,207 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001       , Michał Moskal
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2009, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include "prototypes.h"
+#include "defines.h"
+#include <pwd.h>
+#include <stdio.h>
+#include "commonio.h"
+#include "pwio.h"
+
+static /*@null@*/ /*@only@*/void *passwd_dup (const void *ent)
+{
+	const struct passwd *pw = ent;
+
+	return __pw_dup (pw);
+}
+
+static void passwd_free (/*@out@*/ /*@only@*/void *ent)
+{
+	struct passwd *pw = ent;
+
+	pw_free (pw);
+}
+
+static const char *passwd_getname (const void *ent)
+{
+	const struct passwd *pw = ent;
+
+	return pw->pw_name;
+}
+
+static void *passwd_parse (const char *line)
+{
+	return (void *) sgetpwent (line);
+}
+
+static int passwd_put (const void *ent, FILE * file)
+{
+	const struct passwd *pw = ent;
+
+	if (   (NULL == pw)
+	    || (valid_field (pw->pw_name, ":\n") == -1)
+	    || (valid_field (pw->pw_passwd, ":\n") == -1)
+	    || (pw->pw_uid == (uid_t)-1)
+	    || (pw->pw_gid == (gid_t)-1)
+	    || (valid_field (pw->pw_gecos, ":\n") == -1)
+	    || (valid_field (pw->pw_dir, ":\n") == -1)
+	    || (valid_field (pw->pw_shell, ":\n") == -1)
+	    || (strlen (pw->pw_name) + strlen (pw->pw_passwd) +
+	        strlen (pw->pw_gecos) + strlen (pw->pw_dir) +
+	        strlen (pw->pw_shell) + 100 > PASSWD_ENTRY_MAX_LENGTH)) {
+		return -1;
+	}
+
+	return (putpwent (pw, file) == -1) ? -1 : 0;
+}
+
+static struct commonio_ops passwd_ops = {
+	passwd_dup,
+	passwd_free,
+	passwd_getname,
+	passwd_parse,
+	passwd_put,
+	fgets,
+	fputs,
+	NULL,			/* open_hook */
+	NULL			/* close_hook */
+};
+
+static struct commonio_db passwd_db = {
+	PASSWD_FILE,		/* filename */
+	&passwd_ops,		/* ops */
+	NULL,			/* fp */
+#ifdef WITH_SELINUX
+	NULL,			/* scontext */
+#endif
+	0644,                   /* st_mode */
+	0,                      /* st_uid */
+	0,                      /* st_gid */
+	NULL,			/* head */
+	NULL,			/* tail */
+	NULL,			/* cursor */
+	false,			/* changed */
+	false,			/* isopen */
+	false,			/* locked */
+	false,			/* readonly */
+	false			/* setname */
+};
+
+int pw_setdbname (const char *filename)
+{
+	return commonio_setname (&passwd_db, filename);
+}
+
+/*@observer@*/const char *pw_dbname (void)
+{
+	return passwd_db.filename;
+}
+
+int pw_lock (void)
+{
+	return commonio_lock (&passwd_db);
+}
+
+int pw_open (int mode)
+{
+	return commonio_open (&passwd_db, mode);
+}
+
+/*@observer@*/ /*@null@*/const struct passwd *pw_locate (const char *name)
+{
+	return commonio_locate (&passwd_db, name);
+}
+
+/*@observer@*/ /*@null@*/const struct passwd *pw_locate_uid (uid_t uid)
+{
+	const struct passwd *pwd;
+
+	pw_rewind ();
+	while (   ((pwd = pw_next ()) != NULL)
+	       && (pwd->pw_uid != uid)) {
+	}
+
+	return pwd;
+}
+
+int pw_update (const struct passwd *pw)
+{
+	return commonio_update (&passwd_db, (const void *) pw);
+}
+
+int pw_remove (const char *name)
+{
+	return commonio_remove (&passwd_db, name);
+}
+
+int pw_rewind (void)
+{
+	return commonio_rewind (&passwd_db);
+}
+
+/*@observer@*/ /*@null@*/const struct passwd *pw_next (void)
+{
+	return commonio_next (&passwd_db);
+}
+
+int pw_close (void)
+{
+	return commonio_close (&passwd_db);
+}
+
+int pw_unlock (void)
+{
+	return commonio_unlock (&passwd_db);
+}
+
+/*@null@*/struct commonio_entry *__pw_get_head (void)
+{
+	return passwd_db.head;
+}
+
+void __pw_del_entry (const struct commonio_entry *ent)
+{
+	commonio_del_entry (&passwd_db, ent);
+}
+
+struct commonio_db *__pw_get_db (void)
+{
+	return &passwd_db;
+}
+
+static int pw_cmp (const void *p1, const void *p2)
+{
+	uid_t u1, u2;
+
+	if ((*(struct commonio_entry **) p1)->eptr == NULL)
+		return 1;
+	if ((*(struct commonio_entry **) p2)->eptr == NULL)
+		return -1;
+
+	u1 = ((struct passwd *) (*(struct commonio_entry **) p1)->eptr)->pw_uid;
+	u2 = ((struct passwd *) (*(struct commonio_entry **) p2)->eptr)->pw_uid;
+
+	if (u1 < u2)
+		return -1;
+	else if (u1 > u2)
+		return 1;
+	else
+		return 0;
+}
+
+/* Sort entries by UID */
+int pw_sort ()
+{
+	return commonio_sort (&passwd_db, pw_cmp);
+}
diff --git a/lib/pwio.h b/lib/pwio.h
new file mode 100644
index 0000000..882a7c7
--- /dev/null
+++ b/lib/pwio.h
@@ -0,0 +1,32 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2005       , Michał Moskal
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/* $Id$ */
+#ifndef _PWIO_H
+#define _PWIO_H
+
+#include <sys/types.h>
+#include <pwd.h>
+
+extern int pw_close (void);
+extern /*@observer@*/ /*@null@*/const struct passwd *pw_locate (const char *name);
+extern /*@observer@*/ /*@null@*/const struct passwd *pw_locate_uid (uid_t uid);
+extern int pw_lock (void);
+extern int pw_setdbname (const char *filename);
+extern /*@observer@*/const char *pw_dbname (void);
+extern /*@observer@*/ /*@null@*/const struct passwd *pw_next (void);
+extern int pw_open (int mode);
+extern int pw_remove (const char *name);
+extern int pw_rewind (void);
+extern int pw_unlock (void);
+extern int pw_update (const struct passwd *pw);
+extern int pw_sort (void);
+
+#endif
diff --git a/lib/pwmem.c b/lib/pwmem.c
new file mode 100644
index 0000000..867e3f7
--- /dev/null
+++ b/lib/pwmem.c
@@ -0,0 +1,85 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001       , Michał Moskal
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2013, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <stdio.h>
+#include "defines.h"
+#include "prototypes.h"
+#include "pwio.h"
+
+/*@null@*/ /*@only@*/struct passwd *__pw_dup (const struct passwd *pwent)
+{
+	struct passwd *pw;
+
+	pw = (struct passwd *) malloc (sizeof *pw);
+	if (NULL == pw) {
+		return NULL;
+	}
+	/* The libc might define other fields. They won't be copied. */
+	memset (pw, 0, sizeof *pw);
+	pw->pw_uid = pwent->pw_uid;
+	pw->pw_gid = pwent->pw_gid;
+	/*@-mustfreeonly@*/
+	pw->pw_name = strdup (pwent->pw_name);
+	/*@=mustfreeonly@*/
+	if (NULL == pw->pw_name) {
+		pw_free(pw);
+		return NULL;
+	}
+	/*@-mustfreeonly@*/
+	pw->pw_passwd = strdup (pwent->pw_passwd);
+	/*@=mustfreeonly@*/
+	if (NULL == pw->pw_passwd) {
+		pw_free(pw);
+		return NULL;
+	}
+	/*@-mustfreeonly@*/
+	pw->pw_gecos = strdup (pwent->pw_gecos);
+	/*@=mustfreeonly@*/
+	if (NULL == pw->pw_gecos) {
+		pw_free(pw);
+		return NULL;
+	}
+	/*@-mustfreeonly@*/
+	pw->pw_dir = strdup (pwent->pw_dir);
+	/*@=mustfreeonly@*/
+	if (NULL == pw->pw_dir) {
+		pw_free(pw);
+		return NULL;
+	}
+	/*@-mustfreeonly@*/
+	pw->pw_shell = strdup (pwent->pw_shell);
+	/*@=mustfreeonly@*/
+	if (NULL == pw->pw_shell) {
+		pw_free(pw);
+		return NULL;
+	}
+
+	return pw;
+}
+
+void pw_free (/*@out@*/ /*@only@*/struct passwd *pwent)
+{
+	if (pwent != NULL) {
+		free (pwent->pw_name);
+		if (pwent->pw_passwd) {
+			strzero (pwent->pw_passwd);
+			free (pwent->pw_passwd);
+		}
+		free (pwent->pw_gecos);
+		free (pwent->pw_dir);
+		free (pwent->pw_shell);
+		free (pwent);
+	}
+}
+
diff --git a/lib/run_part.c b/lib/run_part.c
new file mode 100644
index 0000000..bce11d3
--- /dev/null
+++ b/lib/run_part.c
@@ -0,0 +1,104 @@
+#include <dirent.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <lib/prototypes.h>
+#include "run_part.h"
+#include "shadowlog_internal.h"
+
+int run_part (char *script_path, const char *name, const char *action)
+{
+	int pid;
+	int wait_status;
+	int pid_status;
+	char *args[] = { script_path, NULL };
+
+	pid=fork();
+	if (pid==-1) {
+		perror ("Could not fork");
+		return 1;
+	}
+	if (pid==0) {
+		setenv ("ACTION",action,1);
+		setenv ("SUBJECT",name,1);
+		execv (script_path,args);
+		perror ("execv");
+		exit(1);
+	}
+
+	pid_status = wait (&wait_status);
+	if (pid_status == pid) {
+		return (wait_status);
+	}
+
+	perror ("waitpid");
+	return (1);
+}
+
+int run_parts (const char *directory, const char *name, const char *action)
+{
+	struct dirent **namelist;
+	int scanlist;
+	int n;
+	int execute_result = 0;
+
+	scanlist = scandir (directory, &namelist, 0, alphasort);
+	if (scanlist<=0) {
+		return (0);
+	}
+
+	for (n=0; n<scanlist; n++) {
+		int path_length;
+		struct stat sb;
+
+		path_length=strlen(directory) + strlen(namelist[n]->d_name) + 2;
+		char *s = (char*)malloc(path_length);
+		if (!s) {
+			printf ("could not allocate memory\n");
+			for (; n<scanlist; n++) {
+				free (namelist[n]);
+			}
+			free (namelist);
+			return (1);
+		}
+		snprintf (s, path_length, "%s/%s", directory, namelist[n]->d_name);
+
+		execute_result = 0;
+		if (stat (s, &sb) == -1) {
+			perror ("stat");
+			free (s);
+			for (; n<scanlist; n++) {
+				free (namelist[n]);
+			}
+			free (namelist);
+			return (1);
+		}
+
+		if (S_ISREG (sb.st_mode) || S_ISLNK (sb.st_mode)) {
+			execute_result = run_part (s, name, action);
+		}
+
+		free (s);
+
+		if (execute_result!=0) {
+			fprintf (shadow_logfd,
+				"%s: did not exit cleanly.\n",
+			    namelist[n]->d_name);
+			for (; n<scanlist; n++) {
+				free (namelist[n]);
+			}
+			break;
+		}
+
+		free (namelist[n]);
+	}
+	free (namelist);
+
+	return (execute_result);
+}
+
diff --git a/lib/run_part.h b/lib/run_part.h
new file mode 100644
index 0000000..6422134
--- /dev/null
+++ b/lib/run_part.h
@@ -0,0 +1,7 @@
+#ifndef _RUN_PART_H
+#define _RUN_PART_H
+
+int run_part (char *script_path, const char *name, const char *action);
+int run_parts (const char *directory, const char *name, const char *action);
+
+#endif /* _RUN_PART_H */
diff --git a/lib/selinux.c b/lib/selinux.c
new file mode 100644
index 0000000..ad639bd
--- /dev/null
+++ b/lib/selinux.c
@@ -0,0 +1,210 @@
+/*
+ * SPDX-FileCopyrightText: 2011       , Peter Vrabec <pvrabec@redhat.com>
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ifdef WITH_SELINUX
+
+#include <stdio.h>
+#include "defines.h"
+
+#include <selinux/selinux.h>
+#include <selinux/label.h>
+#include "prototypes.h"
+
+#include "shadowlog_internal.h"
+
+static bool selinux_checked = false;
+static bool selinux_enabled;
+static /*@null@*/struct selabel_handle *selabel_hnd = NULL;
+
+static void cleanup(void)
+{
+	if (selabel_hnd) {
+		selabel_close(selabel_hnd);
+		selabel_hnd = NULL;
+	}
+}
+
+void reset_selinux_handle (void)
+{
+    cleanup();
+}
+
+/*
+ * set_selinux_file_context - Set the security context before any file or
+ *                            directory creation.
+ *
+ *	set_selinux_file_context () should be called before any creation
+ *	of file, symlink, directory, ...
+ *
+ *	Callers may have to Reset SELinux to create files with default
+ *	contexts with reset_selinux_file_context
+ */
+int set_selinux_file_context (const char *dst_name, mode_t mode)
+{
+	if (!selinux_checked) {
+		selinux_enabled = is_selinux_enabled () > 0;
+		selinux_checked = true;
+	}
+
+	if (selinux_enabled) {
+		/* Get the default security context for this file */
+
+		/*@null@*/char *fcontext_raw = NULL;
+		int r;
+
+		if (selabel_hnd == NULL) {
+			selabel_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
+			if (selabel_hnd == NULL) {
+				return security_getenforce () != 0;
+			}
+			(void) atexit(cleanup);
+		}
+
+		r = selabel_lookup_raw(selabel_hnd, &fcontext_raw, dst_name, mode);
+		if (r < 0) {
+			/* No context specified for the searched path */
+			if (errno == ENOENT) {
+				return 0;
+			}
+
+			return security_getenforce () != 0;
+		}
+
+		/* Set the security context for the next created file */
+		r = setfscreatecon_raw (fcontext_raw);
+		freecon (fcontext_raw);
+		if (r < 0) {
+			return security_getenforce () != 0;
+		}
+	}
+	return 0;
+}
+
+/*
+ * reset_selinux_file_context - Reset the security context to the default
+ *                              policy behavior
+ *
+ *	reset_selinux_file_context () should be called after the context
+ *	was changed with set_selinux_file_context ()
+ */
+int reset_selinux_file_context (void)
+{
+	if (!selinux_checked) {
+		selinux_enabled = is_selinux_enabled () > 0;
+		selinux_checked = true;
+	}
+	if (selinux_enabled) {
+		if (setfscreatecon_raw (NULL) != 0) {
+			return security_getenforce () != 0;
+		}
+	}
+	return 0;
+}
+
+/*
+ *  Log callback for libselinux internal error reporting.
+ */
+format_attr(printf, 2, 3)
+static int selinux_log_cb (int type, const char *fmt, ...) {
+	va_list ap;
+	char *buf;
+	int r;
+#ifdef WITH_AUDIT
+	static int selinux_audit_fd = -2;
+#endif
+
+	va_start (ap, fmt);
+	r = vasprintf (&buf, fmt, ap);
+	va_end (ap);
+
+	if (r < 0) {
+		return 0;
+	}
+
+#ifdef WITH_AUDIT
+	if (-2 == selinux_audit_fd) {
+		selinux_audit_fd = audit_open ();
+
+		if (-1 == selinux_audit_fd) {
+			/* You get these only when the kernel doesn't have
+			 * audit compiled in. */
+			if (   (errno != EINVAL)
+			    && (errno != EPROTONOSUPPORT)
+			    && (errno != EAFNOSUPPORT)) {
+
+			    (void) fputs (_("Cannot open audit interface.\n"),
+			              shadow_logfd);
+			    SYSLOG ((LOG_WARN, "Cannot open audit interface."));
+			}
+		}
+	}
+
+	if (-1 != selinux_audit_fd) {
+		if (SELINUX_AVC == type) {
+			if (audit_log_user_avc_message (selinux_audit_fd,
+			    AUDIT_USER_AVC, buf, NULL, NULL,
+			    NULL, 0) > 0) {
+				goto skip_syslog;
+			}
+		} else if (SELINUX_ERROR == type) {
+			if (audit_log_user_avc_message (selinux_audit_fd,
+			    AUDIT_USER_SELINUX_ERR, buf, NULL, NULL,
+			    NULL, 0) > 0) {
+				goto skip_syslog;
+			}
+		}
+	}
+#endif
+
+	SYSLOG ((LOG_WARN, "libselinux: %s", buf));
+
+skip_syslog:
+	free (buf);
+
+	return 0;
+}
+
+/*
+ * check_selinux_permit - Check whether SELinux grants the given
+ *                        operation
+ *
+ *   Parameter is the SELinux permission name, e.g. rootok
+ *
+ *   Returns 0 when permission is granted
+ *                  or something failed but running in
+ *                  permissive mode
+ */
+int check_selinux_permit (const char *perm_name)
+{
+	char *user_context_raw;
+	int r;
+
+	if (0 == is_selinux_enabled ()) {
+		return 0;
+	}
+
+	selinux_set_callback (SELINUX_CB_LOG, (union selinux_callback) selinux_log_cb);
+
+	if (getprevcon_raw (&user_context_raw) != 0) {
+		fprintf (shadow_logfd,
+		    _("%s: can not get previous SELinux process context: %s\n"),
+		    shadow_progname, strerror (errno));
+		SYSLOG ((LOG_WARN,
+		    "can not get previous SELinux process context: %s",
+		    strerror (errno)));
+		return (security_getenforce () != 0);
+	}
+
+	r = selinux_check_access (user_context_raw, user_context_raw, "passwd", perm_name, NULL);
+	freecon (user_context_raw);
+	return r;
+}
+
+#else				/* !WITH_SELINUX */
+extern int errno;		/* warning: ANSI C forbids an empty source file */
+#endif				/* !WITH_SELINUX */
diff --git a/lib/semanage.c b/lib/semanage.c
new file mode 100644
index 0000000..082a6e8
--- /dev/null
+++ b/lib/semanage.c
@@ -0,0 +1,361 @@
+/*
+ * SPDX-FileCopyrightText: 2010       , Jakub Hrozek <jhrozek@redhat.com>
+ * SPDX-FileCopyrightText: 2011       , Peter Vrabec <pvrabec@redhat.com>
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ifdef WITH_SELINUX
+
+#include "defines.h"
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#include <stdio.h>
+#include <stdarg.h>
+#include <selinux/selinux.h>
+#include <semanage/semanage.h>
+#include "prototypes.h"
+
+#include "shadowlog_internal.h"
+
+#ifndef DEFAULT_SERANGE
+#define DEFAULT_SERANGE "s0"
+#endif
+
+
+format_attr(printf, 3, 4)
+static void semanage_error_callback (unused void *varg,
+                                     semanage_handle_t *handle,
+                                     const char *fmt, ...)
+{
+	int ret;
+	char * message = NULL;
+	va_list ap;
+
+
+	va_start (ap, fmt);
+	ret = vasprintf (&message, fmt, ap);
+	va_end (ap);
+	if (ret < 0) {
+		/* ENOMEM */
+		return;
+	}
+
+	switch (semanage_msg_get_level (handle)) {
+	case SEMANAGE_MSG_ERR:
+	case SEMANAGE_MSG_WARN:
+		fprintf (shadow_logfd, _("[libsemanage]: %s\n"), message);
+		break;
+	case SEMANAGE_MSG_INFO:
+		/* nop */
+		break;
+	}
+
+	free (message);
+}
+
+
+static semanage_handle_t *semanage_init (void)
+{
+	int ret;
+	semanage_handle_t *handle = NULL;
+
+	handle = semanage_handle_create ();
+	if (NULL == handle) {
+		fprintf (shadow_logfd,
+		         _("Cannot create SELinux management handle\n"));
+		return NULL;
+	}
+
+	semanage_msg_set_callback (handle, semanage_error_callback, NULL);
+
+	ret = semanage_is_managed (handle);
+	if (ret != 1) {
+		fprintf (shadow_logfd, _("SELinux policy not managed\n"));
+		goto fail;
+	}
+
+	ret = semanage_access_check (handle);
+	if (ret < SEMANAGE_CAN_READ) {
+		fprintf (shadow_logfd, _("Cannot read SELinux policy store\n"));
+		goto fail;
+	}
+
+	ret = semanage_connect (handle);
+	if (ret != 0) {
+		fprintf (shadow_logfd,
+		         _("Cannot establish SELinux management connection\n"));
+		goto fail;
+	}
+
+	ret = semanage_begin_transaction (handle);
+	if (ret != 0) {
+		fprintf (shadow_logfd, _("Cannot begin SELinux transaction\n"));
+		goto fail;
+	}
+
+	return handle;
+
+fail:
+	semanage_handle_destroy (handle);
+	return NULL;
+}
+
+
+static int semanage_user_mod (semanage_handle_t *handle,
+                              semanage_seuser_key_t *key,
+                              const char *login_name,
+                              const char *seuser_name)
+{
+	int ret;
+	semanage_seuser_t *seuser = NULL;
+
+	semanage_seuser_query (handle, key, &seuser);
+	if (NULL == seuser) {
+		fprintf (shadow_logfd,
+		         _("Could not query seuser for %s\n"), login_name);
+		ret = 1;
+		goto done;
+	}
+
+	if (semanage_mls_enabled(handle)) {
+		ret = semanage_seuser_set_mlsrange (handle, seuser, DEFAULT_SERANGE);
+		if (ret != 0) {
+			fprintf (shadow_logfd,
+			         _("Could not set serange for %s\n"), login_name);
+			ret = 1;
+			goto done;
+		}
+	}
+
+	ret = semanage_seuser_set_sename (handle, seuser, seuser_name);
+	if (ret != 0) {
+		fprintf (shadow_logfd,
+		         _("Could not set sename for %s\n"),
+		         login_name);
+		ret = 1;
+		goto done;
+	}
+
+	ret = semanage_seuser_modify_local (handle, key, seuser);
+	if (ret != 0) {
+		fprintf (shadow_logfd,
+		         _("Could not modify login mapping for %s\n"),
+		         login_name);
+		ret = 1;
+		goto done;
+	}
+
+	ret = 0;
+done:
+	semanage_seuser_free (seuser);
+	return ret;
+}
+
+
+static int semanage_user_add (semanage_handle_t *handle,
+                             semanage_seuser_key_t *key,
+                             const char *login_name,
+                             const char *seuser_name)
+{
+	int ret;
+	semanage_seuser_t *seuser = NULL;
+
+	ret = semanage_seuser_create (handle, &seuser);
+	if (ret != 0) {
+		fprintf (shadow_logfd,
+		         _("Cannot create SELinux login mapping for %s\n"),
+		         login_name);
+		ret = 1;
+		goto done;
+	}
+
+	ret = semanage_seuser_set_name (handle, seuser, login_name);
+	if (ret != 0) {
+		fprintf (shadow_logfd, _("Could not set name for %s\n"), login_name);
+		ret = 1;
+		goto done;
+	}
+
+	if (semanage_mls_enabled(handle)) {
+		ret = semanage_seuser_set_mlsrange (handle, seuser, DEFAULT_SERANGE);
+		if (ret != 0) {
+			fprintf (shadow_logfd,
+			         _("Could not set serange for %s\n"), login_name);
+			ret = 1;
+			goto done;
+		}
+	}
+
+	ret = semanage_seuser_set_sename (handle, seuser, seuser_name);
+	if (ret != 0) {
+		fprintf (shadow_logfd,
+		         _("Could not set SELinux user for %s\n"),
+		         login_name);
+		ret = 1;
+		goto done;
+	}
+
+	ret = semanage_seuser_modify_local (handle, key, seuser);
+	if (ret != 0) {
+		fprintf (shadow_logfd,
+		         _("Could not add login mapping for %s\n"),
+		         login_name);
+		ret = 1;
+		goto done;
+	}
+
+	ret = 0;
+done:
+	semanage_seuser_free (seuser);
+	return ret;
+}
+
+
+int set_seuser (const char *login_name, const char *seuser_name)
+{
+	semanage_handle_t *handle = NULL;
+	semanage_seuser_key_t *key = NULL;
+	int ret;
+	int seuser_exists = 0;
+
+	if (NULL == seuser_name) {
+		/* don't care, just let system pick the defaults */
+		return 0;
+	}
+
+	handle = semanage_init ();
+	if (NULL == handle) {
+		fprintf (shadow_logfd, _("Cannot init SELinux management\n"));
+		ret = 1;
+		goto done;
+	}
+
+	ret = semanage_seuser_key_create (handle, login_name, &key);
+	if (ret != 0) {
+		fprintf (shadow_logfd, _("Cannot create SELinux user key\n"));
+		ret = 1;
+		goto done;
+	}
+
+	ret = semanage_seuser_exists (handle, key, &seuser_exists);
+	if (ret < 0) {
+		fprintf (shadow_logfd, _("Cannot verify the SELinux user\n"));
+		ret = 1;
+		goto done;
+	}
+
+	if (0 != seuser_exists) {
+		ret = semanage_user_mod (handle, key, login_name, seuser_name);
+		if (ret != 0) {
+			fprintf (shadow_logfd,
+			         _("Cannot modify SELinux user mapping\n"));
+			ret = 1;
+			goto done;
+		}
+	} else {
+		ret = semanage_user_add (handle, key, login_name, seuser_name);
+		if (ret != 0) {
+			fprintf (shadow_logfd,
+			         _("Cannot add SELinux user mapping\n"));
+			ret = 1;
+			goto done;
+		}
+	}
+
+	ret = semanage_commit (handle);
+	if (ret < 0) {
+		fprintf (shadow_logfd, _("Cannot commit SELinux transaction\n"));
+		ret = 1;
+		goto done;
+	}
+
+	ret = 0;
+	reset_selinux_handle();
+
+done:
+	semanage_seuser_key_free (key);
+	semanage_handle_destroy (handle);
+	return ret;
+}
+
+
+int del_seuser (const char *login_name)
+{
+	semanage_handle_t *handle = NULL;
+	semanage_seuser_key_t *key = NULL;
+	int ret;
+	int exists = 0;
+
+	handle = semanage_init ();
+	if (NULL == handle) {
+		fprintf (shadow_logfd, _("Cannot init SELinux management\n"));
+		ret = 1;
+		goto done;
+	}
+
+	ret = semanage_seuser_key_create (handle, login_name, &key);
+	if (ret != 0) {
+		fprintf (shadow_logfd, _("Cannot create SELinux user key\n"));
+		ret = 1;
+		goto done;
+	}
+
+	ret = semanage_seuser_exists (handle, key, &exists);
+	if (ret < 0) {
+		fprintf (shadow_logfd, _("Cannot verify the SELinux user\n"));
+		ret = 1;
+		goto done;
+	}
+
+	if (0 == exists) {
+		fprintf (shadow_logfd,
+		         _("Login mapping for %s is not defined, OK if default mapping was used\n"),
+		         login_name);
+		ret = 0;  /* probably default mapping */
+		goto done;
+	}
+
+	ret = semanage_seuser_exists_local (handle, key, &exists);
+	if (ret < 0) {
+		fprintf (shadow_logfd, _("Cannot verify the SELinux user\n"));
+		ret = 1;
+		goto done;
+	}
+
+	if (0 == exists) {
+		fprintf (shadow_logfd,
+		         _("Login mapping for %s is defined in policy, cannot be deleted\n"),
+		         login_name);
+		ret = 0; /* Login mapping defined in policy can't be deleted */
+		goto done;
+	}
+
+	ret = semanage_seuser_del_local (handle, key);
+	if (ret != 0) {
+		fprintf (shadow_logfd,
+		         _("Could not delete login mapping for %s"),
+		         login_name);
+		ret = 1;
+		goto done;
+	}
+
+	ret = semanage_commit (handle);
+	if (ret < 0) {
+		fprintf (shadow_logfd, _("Cannot commit SELinux transaction\n"));
+		ret = 1;
+		goto done;
+	}
+
+	ret = 0;
+done:
+	semanage_handle_destroy (handle);
+	return ret;
+}
+#else				/* !WITH_SELINUX */
+extern int errno;		/* warning: ANSI C forbids an empty source file */
+#endif				/* !WITH_SELINUX */
diff --git a/lib/sgetgrent.c b/lib/sgetgrent.c
new file mode 100644
index 0000000..ad4fcc8
--- /dev/null
+++ b/lib/sgetgrent.c
@@ -0,0 +1,129 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <grp.h>
+#include "defines.h"
+#include "prototypes.h"
+
+#define	NFIELDS	4
+
+/*
+ * list - turn a comma-separated string into an array of (char *)'s
+ *
+ *	list() converts the comma-separated list of member names into
+ *	an array of character pointers.
+ *
+ *	WARNING: I profiled this once with and without strchr() calls
+ *	and found that using a register variable and an explicit loop
+ *	works best.  For large /etc/group files, this is a major win.
+ *
+ * FINALLY added dynamic allocation.  Still need to fix sgetsgent().
+ *  --marekm
+ */
+static char **list (char *s)
+{
+	static char **members = 0;
+	static int size = 0;	/* max members + 1 */
+	int i;
+	char **rbuf;
+
+	i = 0;
+	for (;;) {
+		/* check if there is room for another pointer (to a group
+		   member name, or terminating NULL).  */
+		if (i >= size) {
+			size = i + 100;	/* at least: i + 1 */
+			if (members) {
+				rbuf =
+				    realloc (members, size * sizeof (char *));
+			} else {
+				/* for old (before ANSI C) implementations of
+				   realloc() that don't handle NULL properly */
+				rbuf = malloc (size * sizeof (char *));
+			}
+			if (!rbuf) {
+				free (members);
+				members = 0;
+				size = 0;
+				return (char **) 0;
+			}
+			members = rbuf;
+		}
+		if (!s || s[0] == '\0')
+			break;
+		members[i++] = s;
+		while (('\0' != *s) && (',' != *s)) {
+			s++;
+		}
+		if ('\0' != *s) {
+			*s++ = '\0';
+		}
+	}
+	members[i] = (char *) 0;
+	return members;
+}
+
+
+struct group *sgetgrent (const char *buf)
+{
+	static char *grpbuf = 0;
+	static size_t size = 0;
+	static char *grpfields[NFIELDS];
+	static struct group grent;
+	int i;
+	char *cp;
+
+	if (strlen (buf) + 1 > size) {
+		/* no need to use realloc() here - just free it and
+		   allocate a larger block */
+		free (grpbuf);
+		size = strlen (buf) + 1000;	/* at least: strlen(buf) + 1 */
+		grpbuf = malloc (size);
+		if (!grpbuf) {
+			size = 0;
+			return 0;
+		}
+	}
+	strcpy (grpbuf, buf);
+
+	cp = strrchr (grpbuf, '\n');
+	if (NULL != cp) {
+		*cp = '\0';
+	}
+
+	for (cp = grpbuf, i = 0; (i < NFIELDS) && (NULL != cp); i++) {
+		grpfields[i] = cp;
+		cp = strchr (cp, ':');
+		if (NULL != cp) {
+			*cp = '\0';
+			cp++;
+		}
+	}
+	if (i < (NFIELDS - 1) || *grpfields[2] == '\0' || cp != NULL) {
+		return (struct group *) 0;
+	}
+	grent.gr_name = grpfields[0];
+	grent.gr_passwd = grpfields[1];
+	if (get_gid (grpfields[2], &grent.gr_gid) == 0) {
+		return (struct group *) 0;
+	}
+	grent.gr_mem = list (grpfields[3]);
+	if (NULL == grent.gr_mem) {
+		return (struct group *) 0;	/* out of memory */
+	}
+
+	return &grent;
+}
+
diff --git a/lib/sgetpwent.c b/lib/sgetpwent.c
new file mode 100644
index 0000000..1c8c63e
--- /dev/null
+++ b/lib/sgetpwent.c
@@ -0,0 +1,109 @@
+/*
+ * SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <sys/types.h>
+#include "defines.h"
+#include <stdio.h>
+#include <pwd.h>
+#include "prototypes.h"
+#include "shadowlog_internal.h"
+
+#define	NFIELDS	7
+
+/*
+ * sgetpwent - convert a string to a (struct passwd)
+ *
+ * sgetpwent() parses a string into the parts required for a password
+ * structure.  Strict checking is made for the UID and GID fields and
+ * presence of the correct number of colons.  Any failing tests result
+ * in a NULL pointer being returned.
+ *
+ * NOTE: This function uses hard-coded string scanning functions for
+ *	performance reasons.  I am going to come up with some conditional
+ *	compilation glarp to improve on this in the future.
+ */
+struct passwd *sgetpwent (const char *buf)
+{
+	static struct passwd pwent;
+	static char pwdbuf[PASSWD_ENTRY_MAX_LENGTH];
+	int i;
+	char *cp;
+	char *fields[NFIELDS];
+
+	/*
+	 * Copy the string to a static buffer so the pointers into
+	 * the password structure remain valid.
+	 */
+
+	if (strlen (buf) >= sizeof pwdbuf) {
+		fprintf (shadow_logfd,
+		         "%s: Too long passwd entry encountered, file corruption?\n",
+		         shadow_progname);
+		return 0;	/* fail if too long */
+	}
+	strcpy (pwdbuf, buf);
+
+	/*
+	 * Save a pointer to the start of each colon separated
+	 * field.  The fields are converted into NUL terminated strings.
+	 */
+
+	for (cp = pwdbuf, i = 0; (i < NFIELDS) && (NULL != cp); i++) {
+		fields[i] = cp;
+		while (('\0' != *cp) && (':' != *cp)) {
+			cp++;
+		}
+
+		if ('\0' != *cp) {
+			*cp = '\0';
+			cp++;
+		} else {
+			cp = NULL;
+		}
+	}
+
+	/* something at the end, columns over shot */
+	if ( cp != NULL ) {
+		return( NULL );
+	}
+
+	/*
+	 * There must be exactly NFIELDS colon separated fields or
+	 * the entry is invalid.  Also, the UID and GID must be non-blank.
+	 */
+
+	if (i != NFIELDS || *fields[2] == '\0' || *fields[3] == '\0')
+		return NULL;
+
+	/*
+	 * Each of the fields is converted the appropriate data type
+	 * and the result assigned to the password structure.  If the
+	 * UID or GID does not convert to an integer value, a NULL
+	 * pointer is returned.
+	 */
+
+	pwent.pw_name = fields[0];
+	pwent.pw_passwd = fields[1];
+	if (get_uid (fields[2], &pwent.pw_uid) == 0) {
+		return NULL;
+	}
+	if (get_gid (fields[3], &pwent.pw_gid) == 0) {
+		return NULL;
+	}
+	pwent.pw_gecos = fields[4];
+	pwent.pw_dir = fields[5];
+	pwent.pw_shell = fields[6];
+
+	return &pwent;
+}
+
diff --git a/lib/sgetspent.c b/lib/sgetspent.c
new file mode 100644
index 0000000..f1d4b20
--- /dev/null
+++ b/lib/sgetspent.c
@@ -0,0 +1,187 @@
+/*
+ * SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2009       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+/* Newer versions of Linux libc already have shadow support.  */
+#ifndef HAVE_SGETSPENT
+
+#ident "$Id$"
+
+#include <sys/types.h>
+#include "prototypes.h"
+#include "shadowlog_internal.h"
+#include "defines.h"
+#include <stdio.h>
+#define	FIELDS	9
+#define	OFIELDS	5
+/*
+ * sgetspent - convert string in shadow file format to (struct spwd *)
+ */
+struct spwd *sgetspent (const char *string)
+{
+	static char spwbuf[PASSWD_ENTRY_MAX_LENGTH];
+	static struct spwd spwd;
+	char *fields[FIELDS];
+	char *cp;
+	int i;
+
+	/*
+	 * Copy string to local buffer.  It has to be tokenized and we
+	 * have to do that to our private copy.
+	 */
+
+	if (strlen (string) >= sizeof spwbuf) {
+		fprintf (shadow_logfd,
+		         "%s: Too long passwd entry encountered, file corruption?\n",
+		         shadow_progname);
+		return 0;	/* fail if too long */
+	}
+	strcpy (spwbuf, string);
+
+	cp = strrchr (spwbuf, '\n');
+	if (NULL != cp) {
+		*cp = '\0';
+	}
+
+	/*
+	 * Tokenize the string into colon separated fields.  Allow up to
+	 * FIELDS different fields.
+	 */
+
+	for (cp = spwbuf, i = 0; ('\0' != *cp) && (i < FIELDS); i++) {
+		fields[i] = cp;
+		while (('\0' != *cp) && (':' != *cp)) {
+			cp++;
+		}
+
+		if ('\0' != *cp) {
+			*cp = '\0';
+			cp++;
+		}
+	}
+
+	if (i == (FIELDS - 1)) {
+		fields[i++] = cp;
+	}
+
+	if ( ((NULL != cp) && ('\0' != *cp)) ||
+	     ((i != FIELDS) && (i != OFIELDS)) ) {
+		return 0;
+	}
+
+	/*
+	 * Start populating the structure.  The fields are all in
+	 * static storage, as is the structure we pass back.
+	 */
+
+	spwd.sp_namp = fields[0];
+	spwd.sp_pwdp = fields[1];
+
+	/*
+	 * Get the last changed date.  For all of the integer fields,
+	 * we check for proper format.  It is an error to have an
+	 * incorrectly formatted number.
+	 */
+
+	if (fields[2][0] == '\0') {
+		spwd.sp_lstchg = -1;
+	} else if (   (getlong (fields[2], &spwd.sp_lstchg) == 0)
+	           || (spwd.sp_lstchg < 0)) {
+		return 0;
+	}
+
+	/*
+	 * Get the minimum period between password changes.
+	 */
+
+	if (fields[3][0] == '\0') {
+		spwd.sp_min = -1;
+	} else if (   (getlong (fields[3], &spwd.sp_min) == 0)
+	           || (spwd.sp_min < 0)) {
+		return 0;
+	}
+
+	/*
+	 * Get the maximum number of days a password is valid.
+	 */
+
+	if (fields[4][0] == '\0') {
+		spwd.sp_max = -1;
+	} else if (   (getlong (fields[4], &spwd.sp_max) == 0)
+	           || (spwd.sp_max < 0)) {
+		return 0;
+	}
+
+	/*
+	 * If there are only OFIELDS fields (this is a SVR3.2 /etc/shadow
+	 * formatted file), initialize the other field members to -1.
+	 */
+
+	if (i == OFIELDS) {
+		spwd.sp_warn   = -1;
+		spwd.sp_inact  = -1;
+		spwd.sp_expire = -1;
+		spwd.sp_flag   = SHADOW_SP_FLAG_UNSET;
+
+		return &spwd;
+	}
+
+	/*
+	 * Get the number of days of password expiry warning.
+	 */
+
+	if (fields[5][0] == '\0') {
+		spwd.sp_warn = -1;
+	} else if (   (getlong (fields[5], &spwd.sp_warn) == 0)
+	           || (spwd.sp_warn < 0)) {
+		return 0;
+	}
+
+	/*
+	 * Get the number of days of inactivity before an account is
+	 * disabled.
+	 */
+
+	if (fields[6][0] == '\0') {
+		spwd.sp_inact = -1;
+	} else if (   (getlong (fields[6], &spwd.sp_inact) == 0)
+	           || (spwd.sp_inact < 0)) {
+		return 0;
+	}
+
+	/*
+	 * Get the number of days after the epoch before the account is
+	 * set to expire.
+	 */
+
+	if (fields[7][0] == '\0') {
+		spwd.sp_expire = -1;
+	} else if (   (getlong (fields[7], &spwd.sp_expire) == 0)
+	           || (spwd.sp_expire < 0)) {
+		return 0;
+	}
+
+	/*
+	 * This field is reserved for future use.  But it isn't supposed
+	 * to have anything other than a valid integer in it.
+	 */
+
+	if (fields[8][0] == '\0') {
+		spwd.sp_flag = SHADOW_SP_FLAG_UNSET;
+	} else if (getulong (fields[8], &spwd.sp_flag) == 0) {
+		return 0;
+	}
+
+	return (&spwd);
+}
+#else
+extern int errno;		/* warning: ANSI C forbids an empty source file */
+#endif
+
diff --git a/lib/sgroupio.c b/lib/sgroupio.c
new file mode 100644
index 0000000..871749b
--- /dev/null
+++ b/lib/sgroupio.c
@@ -0,0 +1,306 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001       , Michał Moskal
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2013, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ifdef SHADOWGRP
+
+#ident "$Id$"
+
+#include "prototypes.h"
+#include "defines.h"
+#include "commonio.h"
+#include "getdef.h"
+#include "sgroupio.h"
+
+/*@null@*/ /*@only@*/struct sgrp *__sgr_dup (const struct sgrp *sgent)
+{
+	struct sgrp *sg;
+	int i;
+
+	sg = (struct sgrp *) malloc (sizeof *sg);
+	if (NULL == sg) {
+		return NULL;
+	}
+	/* Do the same as the other _dup function, even if we know the
+	 * structure. */
+	memset (sg, 0, sizeof *sg);
+	/*@-mustfreeonly@*/
+	sg->sg_name = strdup (sgent->sg_name);
+	/*@=mustfreeonly@*/
+	if (NULL == sg->sg_name) {
+		free (sg);
+		return NULL;
+	}
+	/*@-mustfreeonly@*/
+	sg->sg_passwd = strdup (sgent->sg_passwd);
+	/*@=mustfreeonly@*/
+	if (NULL == sg->sg_passwd) {
+		free (sg->sg_name);
+		free (sg);
+		return NULL;
+	}
+
+	for (i = 0; NULL != sgent->sg_adm[i]; i++);
+	/*@-mustfreeonly@*/
+	sg->sg_adm = (char **) malloc ((i + 1) * sizeof (char *));
+	/*@=mustfreeonly@*/
+	if (NULL == sg->sg_adm) {
+		free (sg->sg_passwd);
+		free (sg->sg_name);
+		free (sg);
+		return NULL;
+	}
+	for (i = 0; NULL != sgent->sg_adm[i]; i++) {
+		sg->sg_adm[i] = strdup (sgent->sg_adm[i]);
+		if (NULL == sg->sg_adm[i]) {
+			for (i = 0; NULL != sg->sg_adm[i]; i++) {
+				free (sg->sg_adm[i]);
+			}
+			free (sg->sg_adm);
+			free (sg->sg_passwd);
+			free (sg->sg_name);
+			free (sg);
+			return NULL;
+		}
+	}
+	sg->sg_adm[i] = NULL;
+
+	for (i = 0; NULL != sgent->sg_mem[i]; i++);
+	/*@-mustfreeonly@*/
+	sg->sg_mem = (char **) malloc ((i + 1) * sizeof (char *));
+	/*@=mustfreeonly@*/
+	if (NULL == sg->sg_mem) {
+		for (i = 0; NULL != sg->sg_adm[i]; i++) {
+			free (sg->sg_adm[i]);
+		}
+		free (sg->sg_adm);
+		free (sg->sg_passwd);
+		free (sg->sg_name);
+		free (sg);
+		return NULL;
+	}
+	for (i = 0; NULL != sgent->sg_mem[i]; i++) {
+		sg->sg_mem[i] = strdup (sgent->sg_mem[i]);
+		if (NULL == sg->sg_mem[i]) {
+			for (i = 0; NULL != sg->sg_mem[i]; i++) {
+				free (sg->sg_mem[i]);
+			}
+			free (sg->sg_mem);
+			for (i = 0; NULL != sg->sg_adm[i]; i++) {
+				free (sg->sg_adm[i]);
+			}
+			free (sg->sg_adm);
+			free (sg->sg_passwd);
+			free (sg->sg_name);
+			free (sg);
+			return NULL;
+		}
+	}
+	sg->sg_mem[i] = NULL;
+
+	return sg;
+}
+
+static /*@null@*/ /*@only@*/void *gshadow_dup (const void *ent)
+{
+	const struct sgrp *sg = ent;
+
+	return __sgr_dup (sg);
+}
+
+static void gshadow_free (/*@out@*/ /*@only@*/void *ent)
+{
+	struct sgrp *sg = ent;
+
+	sgr_free (sg);
+}
+
+void sgr_free (/*@out@*/ /*@only@*/struct sgrp *sgent)
+{
+	size_t i;
+	free (sgent->sg_name);
+	if (NULL != sgent->sg_passwd) {
+		strzero (sgent->sg_passwd);
+		free (sgent->sg_passwd);
+	}
+	for (i = 0; NULL != sgent->sg_adm[i]; i++) {
+		free (sgent->sg_adm[i]);
+	}
+	free (sgent->sg_adm);
+	for (i = 0; NULL != sgent->sg_mem[i]; i++) {
+		free (sgent->sg_mem[i]);
+	}
+	free (sgent->sg_mem);
+	free (sgent);
+}
+
+static const char *gshadow_getname (const void *ent)
+{
+	const struct sgrp *gr = ent;
+
+	return gr->sg_name;
+}
+
+static void *gshadow_parse (const char *line)
+{
+	return (void *) sgetsgent (line);
+}
+
+static int gshadow_put (const void *ent, FILE * file)
+{
+	const struct sgrp *sg = ent;
+
+	if (   (NULL == sg)
+	    || (valid_field (sg->sg_name, ":\n") == -1)
+	    || (valid_field (sg->sg_passwd, ":\n") == -1)) {
+		return -1;
+	}
+
+	/* FIXME: fail also if sg->sg_adm == NULL ?*/
+	if (NULL != sg->sg_adm) {
+		size_t i;
+		for (i = 0; NULL != sg->sg_adm[i]; i++) {
+			if (valid_field (sg->sg_adm[i], ",:\n") == -1) {
+				return -1;
+			}
+		}
+	}
+
+	/* FIXME: fail also if sg->sg_mem == NULL ?*/
+	if (NULL != sg->sg_mem) {
+		size_t i;
+		for (i = 0; NULL != sg->sg_mem[i]; i++) {
+			if (valid_field (sg->sg_mem[i], ",:\n") == -1) {
+				return -1;
+			}
+		}
+	}
+
+	return (putsgent (sg, file) == -1) ? -1 : 0;
+}
+
+static struct commonio_ops gshadow_ops = {
+	gshadow_dup,
+	gshadow_free,
+	gshadow_getname,
+	gshadow_parse,
+	gshadow_put,
+	fgetsx,
+	fputsx,
+	NULL,			/* open_hook */
+	NULL			/* close_hook */
+};
+
+static struct commonio_db gshadow_db = {
+	SGROUP_FILE,		/* filename */
+	&gshadow_ops,		/* ops */
+	NULL,			/* fp */
+#ifdef WITH_SELINUX
+	NULL,			/* scontext */
+#endif
+	0400,                   /* st_mode */
+	0,                      /* st_uid */
+	0,                      /* st_gid */
+	NULL,			/* head */
+	NULL,			/* tail */
+	NULL,			/* cursor */
+	false,			/* changed */
+	false,			/* isopen */
+	false,			/* locked */
+	false,			/* readonly */
+	false			/* setname */
+};
+
+int sgr_setdbname (const char *filename)
+{
+	return commonio_setname (&gshadow_db, filename);
+}
+
+/*@observer@*/const char *sgr_dbname (void)
+{
+	return gshadow_db.filename;
+}
+
+bool sgr_file_present (void)
+{
+	if (getdef_bool ("FORCE_SHADOW"))
+		return true;
+	return commonio_present (&gshadow_db);
+}
+
+int sgr_lock (void)
+{
+	return commonio_lock (&gshadow_db);
+}
+
+int sgr_open (int mode)
+{
+	return commonio_open (&gshadow_db, mode);
+}
+
+/*@observer@*/ /*@null@*/const struct sgrp *sgr_locate (const char *name)
+{
+	return commonio_locate (&gshadow_db, name);
+}
+
+int sgr_update (const struct sgrp *sg)
+{
+	return commonio_update (&gshadow_db, (const void *) sg);
+}
+
+int sgr_remove (const char *name)
+{
+	return commonio_remove (&gshadow_db, name);
+}
+
+int sgr_rewind (void)
+{
+	return commonio_rewind (&gshadow_db);
+}
+
+/*@null@*/const struct sgrp *sgr_next (void)
+{
+	return commonio_next (&gshadow_db);
+}
+
+int sgr_close (void)
+{
+	return commonio_close (&gshadow_db);
+}
+
+int sgr_unlock (void)
+{
+	return commonio_unlock (&gshadow_db);
+}
+
+void __sgr_set_changed (void)
+{
+	gshadow_db.changed = true;
+}
+
+/*@dependent@*/ /*@null@*/struct commonio_entry *__sgr_get_head (void)
+{
+	return gshadow_db.head;
+}
+
+void __sgr_del_entry (const struct commonio_entry *ent)
+{
+	commonio_del_entry (&gshadow_db, ent);
+}
+
+/* Sort with respect to group ordering. */
+int sgr_sort ()
+{
+	return commonio_sort_wrt (&gshadow_db, __gr_get_db ());
+}
+#else
+extern int errno;		/* warning: ANSI C forbids an empty source file */
+#endif
diff --git a/lib/sgroupio.h b/lib/sgroupio.h
new file mode 100644
index 0000000..3474a98
--- /dev/null
+++ b/lib/sgroupio.h
@@ -0,0 +1,29 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001       , Michał Moskal
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/* $Id$ */
+#ifndef _SGROUPIO_H
+#define _SGROUPIO_H
+
+extern int sgr_close (void);
+extern bool sgr_file_present (void);
+extern /*@observer@*/ /*@null@*/const struct sgrp *sgr_locate (const char *name);
+extern int sgr_lock (void);
+extern int sgr_setdbname (const char *filename);
+extern /*@observer@*/const char *sgr_dbname (void);
+extern /*@null@*/const struct sgrp *sgr_next (void);
+extern int sgr_open (int mode);
+extern int sgr_remove (const char *name);
+extern int sgr_rewind (void);
+extern int sgr_unlock (void);
+extern int sgr_update (const struct sgrp *sg);
+extern int sgr_sort (void);
+
+#endif
diff --git a/lib/shadow.c b/lib/shadow.c
new file mode 100644
index 0000000..b628b65
--- /dev/null
+++ b/lib/shadow.c
@@ -0,0 +1,530 @@
+/*
+ * SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2009       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+/* Newer versions of Linux libc already have shadow support.  */
+#ifndef HAVE_GETSPNAM
+
+#ident "$Id$"
+
+#include <sys/types.h>
+#include "prototypes.h"
+#include "defines.h"
+#include <stdio.h>
+#ifdef	USE_NIS
+static bool nis_used;
+static bool nis_ignore;
+static enum { native, start, middle, native2 } nis_state;
+static bool nis_bound;
+static char *nis_domain;
+static char *nis_key;
+static int nis_keylen;
+static char *nis_val;
+static int nis_vallen;
+
+#define	IS_NISCHAR(c) ((c)=='+')
+#endif
+
+static FILE *shadow;
+
+#define	FIELDS	9
+#define	OFIELDS	5
+
+#ifdef	USE_NIS
+
+/*
+ * __setspNIS - turn on or off NIS searches
+ */
+
+void __setspNIS (bool flag)
+{
+	nis_ignore = !flag;
+
+	if (nis_ignore) {
+		nis_used = false;
+	}
+}
+
+/*
+ * bind_nis - bind to NIS server
+ */
+
+static int bind_nis (void)
+{
+	if (yp_get_default_domain (&nis_domain)) {
+		return -1;
+	}
+
+	nis_bound = true;
+	return 0;
+}
+#endif
+
+/*
+ * setspent - initialize access to shadow text and DBM files
+ */
+
+void setspent (void)
+{
+	if (NULL != shadow) {
+		rewind (shadow);
+	}else {
+		shadow = fopen (SHADOW_FILE, "r");
+	}
+
+#ifdef	USE_NIS
+	nis_state = native;
+#endif
+}
+
+/*
+ * endspent - terminate access to shadow text and DBM files
+ */
+
+void endspent (void)
+{
+	if (NULL != shadow) {
+		(void) fclose (shadow);
+	}
+
+	shadow = (FILE *) 0;
+}
+
+/*
+ * my_sgetspent - convert string in shadow file format to (struct spwd *)
+ */
+
+static struct spwd *my_sgetspent (const char *string)
+{
+	static char spwbuf[BUFSIZ];
+	static struct spwd spwd;
+	char *fields[FIELDS];
+	char *cp;
+	int i;
+
+	/*
+	 * Copy string to local buffer.  It has to be tokenized and we
+	 * have to do that to our private copy.
+	 */
+
+	if (strlen (string) >= sizeof spwbuf)
+		return 0;
+	strcpy (spwbuf, string);
+
+	cp = strrchr (spwbuf, '\n');
+	if (NULL != cp)
+		*cp = '\0';
+
+	/*
+	 * Tokenize the string into colon separated fields.  Allow up to
+	 * FIELDS different fields.
+	 */
+
+	for (cp = spwbuf, i = 0; *cp && i < FIELDS; i++) {
+		fields[i] = cp;
+		while (*cp && *cp != ':')
+			cp++;
+
+		if (*cp)
+			*cp++ = '\0';
+	}
+
+	if (i == (FIELDS - 1))
+		fields[i++] = cp;
+
+	if ((cp && *cp) || (i != FIELDS && i != OFIELDS))
+		return 0;
+
+	/*
+	 * Start populating the structure.  The fields are all in
+	 * static storage, as is the structure we pass back.  If we
+	 * ever see a name with '+' as the first character, we try
+	 * to turn on NIS processing.
+	 */
+
+	spwd.sp_namp = fields[0];
+#ifdef	USE_NIS
+	if (IS_NISCHAR (fields[0][0])) {
+		nis_used = true;
+	}
+#endif
+	spwd.sp_pwdp = fields[1];
+
+	/*
+	 * Get the last changed date.  For all of the integer fields,
+	 * we check for proper format.  It is an error to have an
+	 * incorrectly formatted number, unless we are using NIS.
+	 */
+
+	if (fields[2][0] == '\0') {
+		spwd.sp_lstchg = -1;
+	} else {
+		if (getlong (fields[2], &spwd.sp_lstchg) == 0) {
+#ifdef	USE_NIS
+			if (nis_used) {
+				spwd.sp_lstchg = -1;
+			} else
+#endif
+				return 0;
+		} else if (spwd.sp_lstchg < 0) {
+			return 0;
+		}
+	}
+
+	/*
+	 * Get the minimum period between password changes.
+	 */
+
+	if (fields[3][0] == '\0') {
+		spwd.sp_min = -1;
+	} else {
+		if (getlong (fields[3], &spwd.sp_min) == 0) {
+#ifdef	USE_NIS
+			if (nis_used) {
+				spwd.sp_min = -1;
+			} else
+#endif
+			{
+				return 0;
+			}
+		} else if (spwd.sp_min < 0) {
+			return 0;
+		}
+	}
+
+	/*
+	 * Get the maximum number of days a password is valid.
+	 */
+
+	if (fields[4][0] == '\0') {
+		spwd.sp_max = -1;
+	} else {
+		if (getlong (fields[4], &spwd.sp_max) == 0) {
+#ifdef	USE_NIS
+			if (nis_used) {
+				spwd.sp_max = -1;
+			} else
+#endif
+				return 0;
+		} else if (spwd.sp_max < 0) {
+			return 0;
+		}
+	}
+
+	/*
+	 * If there are only OFIELDS fields (this is a SVR3.2 /etc/shadow
+	 * formatted file), initialize the other field members to -1.
+	 */
+
+	if (i == OFIELDS) {
+		spwd.sp_warn   = -1;
+		spwd.sp_inact  = -1;
+		spwd.sp_expire = -1;
+		spwd.sp_flag   = SHADOW_SP_FLAG_UNSET;
+
+		return &spwd;
+	}
+
+	/*
+	 * Get the number of days of password expiry warning.
+	 */
+
+	if (fields[5][0] == '\0') {
+		spwd.sp_warn = -1;
+	} else {
+		if (getlong (fields[5], &spwd.sp_warn) == 0) {
+#ifdef	USE_NIS
+			if (nis_used) {
+				spwd.sp_warn = -1;
+			} else
+#endif
+			{
+				return 0;
+			}
+		} else if (spwd.sp_warn < 0) {
+			return 0;
+		}
+	}
+
+	/*
+	 * Get the number of days of inactivity before an account is
+	 * disabled.
+	 */
+
+	if (fields[6][0] == '\0') {
+		spwd.sp_inact = -1;
+	} else {
+		if (getlong (fields[6], &spwd.sp_inact) == 0) {
+#ifdef	USE_NIS
+			if (nis_used) {
+				spwd.sp_inact = -1;
+			} else
+#endif
+			{
+				return 0;
+			}
+		} else if (spwd.sp_inact < 0) {
+			return 0;
+		}
+	}
+
+	/*
+	 * Get the number of days after the epoch before the account is
+	 * set to expire.
+	 */
+
+	if (fields[7][0] == '\0') {
+		spwd.sp_expire = -1;
+	} else {
+		if (getlong (fields[7], &spwd.sp_expire) == 0) {
+#ifdef	USE_NIS
+			if (nis_used) {
+				spwd.sp_expire = -1;
+			} else
+#endif
+			{
+				return 0;
+			}
+		} else if (spwd.sp_expire < 0) {
+			return 0;
+		}
+	}
+
+	/*
+	 * This field is reserved for future use.  But it isn't supposed
+	 * to have anything other than a valid integer in it.
+	 */
+
+	if (fields[8][0] == '\0') {
+		spwd.sp_flag = SHADOW_SP_FLAG_UNSET;
+	} else {
+		if (getulong (fields[8], &spwd.sp_flag) == 0) {
+#ifdef	USE_NIS
+			if (nis_used) {
+				spwd.sp_flag = SHADOW_SP_FLAG_UNSET;
+			} else
+#endif
+			{
+				return 0;
+			}
+		} else if (spwd.sp_flag < 0) {
+			return 0;
+		}
+	}
+
+	return (&spwd);
+}
+
+/*
+ * fgetspent - get an entry from a /etc/shadow formatted stream
+ */
+
+struct spwd *fgetspent (FILE * fp)
+{
+	char buf[BUFSIZ];
+	char *cp;
+
+	if (NULL == fp) {
+		return (0);
+	}
+
+#ifdef	USE_NIS
+	while (fgets (buf, (int) sizeof buf, fp) != (char *) 0)
+#else
+	if (fgets (buf, (int) sizeof buf, fp) != (char *) 0)
+#endif
+	{
+		cp = strchr (buf, '\n');
+		if (NULL != cp) {
+			*cp = '\0';
+		}
+#ifdef	USE_NIS
+		if (nis_ignore && IS_NISCHAR (buf[0])) {
+			continue;
+		}
+#endif
+		return my_sgetspent (buf);
+	}
+	return 0;
+}
+
+/*
+ * getspent - get a (struct spwd *) from the current shadow file
+ */
+
+struct spwd *getspent (void)
+{
+#ifdef	USE_NIS
+	int nis_1_user = 0;
+	struct spwd *val;
+#endif
+	if (NULL == shadow) {
+		setspent ();
+	}
+
+#ifdef	USE_NIS
+      again:
+	/*
+	 * See if we are reading from the local file.
+	 */
+
+	if (nis_state == native || nis_state == native2) {
+
+		/*
+		 * Get the next entry from the shadow file.  Return NULL
+		 * right away if there is none.
+		 */
+
+		val = fgetspent (shadow);
+		if (NULL == val)
+			return 0;
+
+		/*
+		 * If this entry began with a NIS escape character, we have
+		 * to see if this is just a single user, or if the entire
+		 * map is being asked for.
+		 */
+
+		if (IS_NISCHAR (val->sp_namp[0])) {
+			if (val->sp_namp[1])
+				nis_1_user = 1;
+			else
+				nis_state = start;
+		}
+
+		/*
+		 * If this isn't a NIS user and this isn't an escape to go
+		 * use a NIS map, it must be a regular local user.
+		 */
+
+		if (nis_1_user == 0 && nis_state != start)
+			return val;
+
+		/*
+		 * If this is an escape to use an NIS map, switch over to
+		 * that bunch of code.
+		 */
+
+		if (nis_state == start)
+			goto again;
+
+		/*
+		 * NEEDSWORK.  Here we substitute pieces-parts of this entry.
+		 */
+
+		return 0;
+	} else {
+		if (!nis_bound) {
+			if (bind_nis ()) {
+				nis_state = native2;
+				goto again;
+			}
+		}
+		if (nis_state == start) {
+			if (yp_first (nis_domain, "shadow.bynam", &nis_key,
+			              &nis_keylen, &nis_val, &nis_vallen)) {
+				nis_state = native2;
+				goto again;
+			}
+			nis_state = middle;
+		} else if (nis_state == middle) {
+			if (yp_next (nis_domain, "shadow.bynam", nis_key,
+			             nis_keylen, &nis_key, &nis_keylen,
+			             &nis_val, &nis_vallen)) {
+				nis_state = native2;
+				goto again;
+			}
+		}
+		return my_sgetspent (nis_val);
+	}
+#else
+	return (fgetspent (shadow));
+#endif
+}
+
+/*
+ * getspnam - get a shadow entry by name
+ */
+
+struct spwd *getspnam (const char *name)
+{
+	struct spwd *sp;
+
+#ifdef	USE_NIS
+	static char save_name[16];
+	bool nis_disabled = false;
+#endif
+
+	setspent ();
+
+#ifdef	USE_NIS
+	/*
+	 * Search the shadow.byname map for this user.
+	 */
+
+	if (!nis_ignore && !nis_bound) {
+		bind_nis ();
+	}
+
+	if (!nis_ignore && nis_bound) {
+		char *cp;
+
+		if (yp_match (nis_domain, "shadow.byname", name,
+		              strlen (name), &nis_val, &nis_vallen) == 0) {
+
+			cp = strchr (nis_val, '\n');
+			if (NULL != cp) {
+				*cp = '\0';
+			}
+
+			nis_state = middle;
+			sp = my_sgetspent (nis_val);
+			if (NULL != sp) {
+				strcpy (save_name, sp->sp_namp);
+				nis_key = save_name;
+				nis_keylen = strlen (save_name);
+			}
+			endspent ();
+			return sp;
+		} else {
+			nis_state = native2;
+		}
+	}
+#endif
+#ifdef	USE_NIS
+	/*
+	 * NEEDSWORK -- this is a mess, and it is the same mess in the
+	 * other three files.  I can't just blindly turn off NIS because
+	 * this might be the first pass through the local files.  In
+	 * that case, I never discover that NIS is present.
+	 */
+
+	if (nis_used) {
+		nis_ignore = true;
+		nis_disabled = true;
+	}
+#endif
+	while ((sp = getspent ()) != (struct spwd *) 0) {
+		if (strcmp (name, sp->sp_namp) == 0) {
+			break;
+		}
+	}
+#ifdef	USE_NIS
+	if (nis_disabled) {
+		nis_ignore = false;
+	}
+#endif
+	endspent ();
+	return (sp);
+}
+#else
+extern int errno;		/* warning: ANSI C forbids an empty source file */
+#endif
+
diff --git a/lib/shadowio.c b/lib/shadowio.c
new file mode 100644
index 0000000..683b6c8
--- /dev/null
+++ b/lib/shadowio.c
@@ -0,0 +1,247 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001       , Michał Moskal
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2009, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include "prototypes.h"
+#include "defines.h"
+#include <shadow.h>
+#include <stdio.h>
+#include "commonio.h"
+#include "getdef.h"
+#include "shadowio.h"
+#ifdef WITH_TCB
+#include <tcb.h>
+#include "tcbfuncs.h"
+#endif				/* WITH_TCB */
+
+static /*@null@*/ /*@only@*/void *shadow_dup (const void *ent)
+{
+	const struct spwd *sp = ent;
+
+	return __spw_dup (sp);
+}
+
+static void shadow_free (/*@out@*//*@only@*/void *ent)
+{
+	struct spwd *sp = ent;
+
+	spw_free (sp);
+}
+
+static const char *shadow_getname (const void *ent)
+{
+	const struct spwd *sp = ent;
+
+	return sp->sp_namp;
+}
+
+static void *shadow_parse (const char *line)
+{
+	return (void *) sgetspent (line);
+}
+
+static int shadow_put (const void *ent, FILE * file)
+{
+	const struct spwd *sp = ent;
+
+	if (   (NULL == sp)
+	    || (valid_field (sp->sp_namp, ":\n") == -1)
+	    || (valid_field (sp->sp_pwdp, ":\n") == -1)
+	    || (strlen (sp->sp_namp) + strlen (sp->sp_pwdp) +
+	        1000 > PASSWD_ENTRY_MAX_LENGTH)) {
+		return -1;
+	}
+
+	return (putspent (sp, file) == -1) ? -1 : 0;
+}
+
+static struct commonio_ops shadow_ops = {
+	shadow_dup,
+	shadow_free,
+	shadow_getname,
+	shadow_parse,
+	shadow_put,
+	fgets,
+	fputs,
+	NULL,			/* open_hook */
+	NULL			/* close_hook */
+};
+
+static struct commonio_db shadow_db = {
+	SHADOW_FILE,		/* filename */
+	&shadow_ops,		/* ops */
+	NULL,			/* fp */
+#ifdef WITH_SELINUX
+	NULL,			/* scontext */
+#endif				/* WITH_SELINUX */
+	0400,                   /* st_mode */
+	0,                      /* st_uid */
+	0,                      /* st_gid */
+	NULL,			/* head */
+	NULL,			/* tail */
+	NULL,			/* cursor */
+	false,			/* changed */
+	false,			/* isopen */
+	false,			/* locked */
+	false,			/* readonly */
+	false			/* setname */
+};
+
+int spw_setdbname (const char *filename)
+{
+	return commonio_setname (&shadow_db, filename);
+}
+
+/*@observer@*/const char *spw_dbname (void)
+{
+	return shadow_db.filename;
+}
+
+bool spw_file_present (void)
+{
+	if (getdef_bool ("FORCE_SHADOW"))
+		return true;
+	return commonio_present (&shadow_db);
+}
+
+int spw_lock (void)
+{
+#ifdef WITH_TCB
+	int retval = 0;
+
+	if (!getdef_bool ("USE_TCB")) {
+#endif				/* WITH_TCB */
+		return commonio_lock (&shadow_db);
+#ifdef WITH_TCB
+	}
+	if (shadowtcb_drop_priv () == SHADOWTCB_FAILURE) {
+		return 0;
+	}
+	if (lckpwdf_tcb (shadow_db.filename) == 0) {
+		shadow_db.locked = 1;
+		retval = 1;
+	}
+	if (shadowtcb_gain_priv () == SHADOWTCB_FAILURE) {
+		return 0;
+	}
+	return retval;
+#endif				/* WITH_TCB */
+}
+
+int spw_open (int mode)
+{
+	int retval = 0;
+#ifdef WITH_TCB
+	bool use_tcb = getdef_bool ("USE_TCB");
+
+	if (use_tcb && (shadowtcb_drop_priv () == SHADOWTCB_FAILURE)) {
+		return 0;
+	}
+#endif				/* WITH_TCB */
+	retval = commonio_open (&shadow_db, mode);
+#ifdef WITH_TCB
+	if (use_tcb && (shadowtcb_gain_priv () == SHADOWTCB_FAILURE)) {
+		return 0;
+	}
+#endif				/* WITH_TCB */
+	return retval;
+}
+
+/*@observer@*/ /*@null@*/const struct spwd *spw_locate (const char *name)
+{
+	return commonio_locate (&shadow_db, name);
+}
+
+int spw_update (const struct spwd *sp)
+{
+	return commonio_update (&shadow_db, (const void *) sp);
+}
+
+int spw_remove (const char *name)
+{
+	return commonio_remove (&shadow_db, name);
+}
+
+int spw_rewind (void)
+{
+	return commonio_rewind (&shadow_db);
+}
+
+/*@observer@*/ /*@null@*/const struct spwd *spw_next (void)
+{
+	return commonio_next (&shadow_db);
+}
+
+int spw_close (void)
+{
+	int retval = 0;
+#ifdef WITH_TCB
+	bool use_tcb = getdef_bool ("USE_TCB");
+
+	if (use_tcb && (shadowtcb_drop_priv () == SHADOWTCB_FAILURE)) {
+		return 0;
+	}
+#endif				/* WITH_TCB */
+	retval = commonio_close (&shadow_db);
+#ifdef WITH_TCB
+	if (use_tcb && (shadowtcb_gain_priv () == SHADOWTCB_FAILURE)) {
+		return 0;
+	}
+#endif				/* WITH_TCB */
+	return retval;
+}
+
+int spw_unlock (void)
+{
+#ifdef WITH_TCB
+	int retval = 0;
+
+	if (!getdef_bool ("USE_TCB")) {
+#endif				/* WITH_TCB */
+		return commonio_unlock (&shadow_db);
+#ifdef WITH_TCB
+	}
+	if (shadowtcb_drop_priv () == SHADOWTCB_FAILURE) {
+		return 0;
+	}
+	if (ulckpwdf_tcb () == 0) {
+		shadow_db.locked = 0;
+		retval = 1;
+	}
+	if (shadowtcb_gain_priv () == SHADOWTCB_FAILURE) {
+		return 0;
+	}
+	return retval;
+#endif				/* WITH_TCB */
+}
+
+struct commonio_entry *__spw_get_head (void)
+{
+	return shadow_db.head;
+}
+
+void __spw_del_entry (const struct commonio_entry *ent)
+{
+	commonio_del_entry (&shadow_db, ent);
+}
+
+/* Sort with respect to passwd ordering. */
+int spw_sort ()
+{
+#ifdef WITH_TCB
+	if (getdef_bool ("USE_TCB")) {
+		return 0;
+	}
+#endif				/* WITH_TCB */
+	return commonio_sort_wrt (&shadow_db, __pw_get_db ());
+}
diff --git a/lib/shadowio.h b/lib/shadowio.h
new file mode 100644
index 0000000..4dbeb6d
--- /dev/null
+++ b/lib/shadowio.h
@@ -0,0 +1,30 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/* $Id$ */
+#ifndef SHADOWIO_H
+#define SHADOWIO_H
+
+#include "defines.h"
+
+extern int spw_close (void);
+extern bool spw_file_present (void);
+extern /*@observer@*/ /*@null@*/const struct spwd *spw_locate (const char *name);
+extern int spw_lock (void);
+extern int spw_setdbname (const char *filename);
+extern /*@observer@*/const char *spw_dbname (void);
+extern /*@observer@*/ /*@null@*/const struct spwd *spw_next (void);
+extern int spw_open (int mode);
+extern int spw_remove (const char *name);
+extern int spw_rewind (void);
+extern int spw_unlock (void);
+extern int spw_update (const struct spwd *sp);
+extern int spw_sort (void);
+
+#endif
diff --git a/lib/shadowlog.c b/lib/shadowlog.c
new file mode 100644
index 0000000..7bcc63c
--- /dev/null
+++ b/lib/shadowlog.c
@@ -0,0 +1,31 @@
+#include "shadowlog.h"
+
+#include "lib/shadowlog_internal.h"
+
+const char *shadow_progname = "libshadow";
+FILE *shadow_logfd = NULL;
+
+void log_set_progname(const char *progname)
+{
+	shadow_progname = progname;
+}
+
+const char *log_get_progname(void)
+{
+	return shadow_progname;
+}
+
+void log_set_logfd(FILE *fd)
+{
+	if (NULL != fd)
+		shadow_logfd = fd;
+	else
+		shadow_logfd = stderr;
+}
+
+FILE *log_get_logfd(void)
+{
+	if (shadow_logfd != NULL)
+		return shadow_logfd;
+	return stderr;
+}
diff --git a/lib/shadowlog.h b/lib/shadowlog.h
new file mode 100644
index 0000000..52a0912
--- /dev/null
+++ b/lib/shadowlog.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2021       , Serge Hallyn
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the copyright holders or contributors may not be used to
+ *    endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* $Id$ */
+#ifndef _LOG_H
+#define _LOG_H
+#include <stdio.h>
+
+extern void log_set_progname(const char *);
+extern const char *log_get_progname(void);
+extern void log_set_logfd(FILE *fd);
+extern FILE *log_get_logfd(void);
+
+#endif
diff --git a/lib/shadowlog_internal.h b/lib/shadowlog_internal.h
new file mode 100644
index 0000000..72a0e0c
--- /dev/null
+++ b/lib/shadowlog_internal.h
@@ -0,0 +1,7 @@
+#ifndef _SHADOWLOG_INTERNAL_H
+#define _SHADOWLOG_INTERNAL_H
+
+extern const char *shadow_progname; /* Program name showed in error messages */
+extern FILE *shadow_logfd;  /* file descripter to which error messages are printed */
+
+#endif /* _SHADOWLOG_INTERNAL_H */
diff --git a/lib/shadowmem.c b/lib/shadowmem.c
new file mode 100644
index 0000000..82f99e7
--- /dev/null
+++ b/lib/shadowmem.c
@@ -0,0 +1,68 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001       , Michał Moskal
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2013, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include "prototypes.h"
+#include "defines.h"
+#include <shadow.h>
+#include <stdio.h>
+#include "shadowio.h"
+
+/*@null@*/ /*@only@*/struct spwd *__spw_dup (const struct spwd *spent)
+{
+	struct spwd *sp;
+
+	sp = (struct spwd *) malloc (sizeof *sp);
+	if (NULL == sp) {
+		return NULL;
+	}
+	/* The libc might define other fields. They won't be copied. */
+	memset (sp, 0, sizeof *sp);
+	sp->sp_lstchg = spent->sp_lstchg;
+	sp->sp_min    = spent->sp_min;
+	sp->sp_max    = spent->sp_max;
+	sp->sp_warn   = spent->sp_warn;
+	sp->sp_inact  = spent->sp_inact;
+	sp->sp_expire = spent->sp_expire;
+	sp->sp_flag   = spent->sp_flag;
+	/*@-mustfreeonly@*/
+	sp->sp_namp   = strdup (spent->sp_namp);
+	/*@=mustfreeonly@*/
+	if (NULL == sp->sp_namp) {
+		free(sp);
+		return NULL;
+	}
+	/*@-mustfreeonly@*/
+	sp->sp_pwdp = strdup (spent->sp_pwdp);
+	/*@=mustfreeonly@*/
+	if (NULL == sp->sp_pwdp) {
+		free(sp->sp_namp);
+		free(sp);
+		return NULL;
+	}
+
+	return sp;
+}
+
+void spw_free (/*@out@*/ /*@only@*/struct spwd *spent)
+{
+	if (spent != NULL) {
+		free (spent->sp_namp);
+		if (NULL != spent->sp_pwdp) {
+			strzero (spent->sp_pwdp);
+			free (spent->sp_pwdp);
+		}
+		free (spent);
+	}
+}
+
diff --git a/lib/spawn.c b/lib/spawn.c
new file mode 100644
index 0000000..ce1a97d
--- /dev/null
+++ b/lib/spawn.c
@@ -0,0 +1,63 @@
+/*
+ * SPDX-FileCopyrightText: 2011       , Jonathan Nieder
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include "exitcodes.h"
+#include "prototypes.h"
+
+#include "shadowlog_internal.h"
+
+int run_command (const char *cmd, const char *argv[],
+                 /*@null@*/const char *envp[], /*@out@*/int *status)
+{
+	pid_t pid, wpid;
+
+	if (NULL == envp) {
+		envp = (const char **)environ;
+	}
+
+	(void) fflush (stdout);
+	(void) fflush (shadow_logfd);
+
+	pid = fork ();
+	if (0 == pid) {
+		(void) execve (cmd, (char * const *) argv,
+		               (char * const *) envp);
+		if (ENOENT == errno) {
+			exit (E_CMD_NOTFOUND);
+		}
+		fprintf (shadow_logfd, "%s: cannot execute %s: %s\n",
+		         shadow_progname, cmd, strerror (errno));
+		exit (E_CMD_NOEXEC);
+	} else if ((pid_t)-1 == pid) {
+		fprintf (shadow_logfd, "%s: cannot execute %s: %s\n",
+		         shadow_progname, cmd, strerror (errno));
+		return -1;
+	}
+
+	do {
+		wpid = waitpid (pid, status, 0);
+		if ((pid_t)-1 == wpid && errno == ECHILD)
+			break;
+	} while (   ((pid_t)-1 == wpid && errno == EINTR)
+	         || ((pid_t)-1 != wpid && wpid != pid));
+
+	if ((pid_t)-1 == wpid) {
+		fprintf (shadow_logfd, "%s: waitpid (status: %d): %s\n",
+		         shadow_progname, *status, strerror (errno));
+		return -1;
+	}
+
+	return 0;
+}
+
diff --git a/lib/sssd.c b/lib/sssd.c
new file mode 100644
index 0000000..786ccd6
--- /dev/null
+++ b/lib/sssd.c
@@ -0,0 +1,75 @@
+/* Author: Peter Vrabec <pvrabec@redhat.com> */
+
+#include <config.h>
+#ifdef USE_SSSD
+
+#include <stdio.h>
+#include <sys/wait.h>
+#include <sys/types.h>
+#include "exitcodes.h"
+#include "defines.h"
+#include "prototypes.h"
+#include "sssd.h"
+
+#include "shadowlog_internal.h"
+
+#define MSG_SSSD_FLUSH_CACHE_FAILED "%s: Failed to flush the sssd cache."
+
+int sssd_flush_cache (int dbflags)
+{
+	int status, code, rv;
+	const char *cmd = "/usr/sbin/sss_cache";
+	char *sss_cache_args = NULL;
+	const char *spawnedArgs[] = {"sss_cache", NULL, NULL};
+	const char *spawnedEnv[] = {NULL};
+	int i = 0;
+
+	sss_cache_args = malloc(4);
+	if (sss_cache_args == NULL) {
+	    return -1;
+	}
+
+	sss_cache_args[i++] = '-';
+	if (dbflags & SSSD_DB_PASSWD) {
+		sss_cache_args[i++] = 'U';
+	}
+	if (dbflags & SSSD_DB_GROUP) {
+		sss_cache_args[i++] = 'G';
+	}
+	sss_cache_args[i++] = '\0';
+	if (i == 2) {
+		/* Neither passwd nor group, nothing to do */
+		free(sss_cache_args);
+		return 0;
+	}
+	spawnedArgs[1] = sss_cache_args;
+
+	rv = run_command (cmd, spawnedArgs, spawnedEnv, &status);
+	free(sss_cache_args);
+	if (rv != 0) {
+		/* run_command writes its own more detailed message. */
+		SYSLOG ((LOG_WARN, MSG_SSSD_FLUSH_CACHE_FAILED, shadow_progname));
+		return -1;
+	}
+
+	code = WEXITSTATUS (status);
+	if (!WIFEXITED (status)) {
+		SYSLOG ((LOG_WARN, "%s: sss_cache did not terminate normally (signal %d)",
+			shadow_progname, WTERMSIG (status)));
+		return -1;
+	} else if (code == E_CMD_NOTFOUND) {
+		/* sss_cache is not installed, or it is installed but uses an
+		   interpreter that is missing.  Probably the former. */
+		return 0;
+	} else if (code != 0) {
+		SYSLOG ((LOG_WARN, "%s: sss_cache exited with status %d", shadow_progname, code));
+		SYSLOG ((LOG_WARN, MSG_SSSD_FLUSH_CACHE_FAILED, shadow_progname));
+		return -1;
+	}
+
+	return 0;
+}
+#else				/* USE_SSSD */
+extern int errno;		/* warning: ANSI C forbids an empty source file */
+#endif				/* USE_SSSD */
+
diff --git a/lib/sssd.h b/lib/sssd.h
new file mode 100644
index 0000000..00ff2a8
--- /dev/null
+++ b/lib/sssd.h
@@ -0,0 +1,17 @@
+#ifndef _SSSD_H_
+#define _SSSD_H_
+
+#define SSSD_DB_PASSWD	0x001
+#define SSSD_DB_GROUP	0x002
+
+/*
+ * sssd_flush_cache - flush specified service buffer in sssd cache
+ */
+#ifdef	USE_SSSD
+extern int sssd_flush_cache (int dbflags);
+#else
+#define sssd_flush_cache(service) (0)
+#endif
+
+#endif
+
diff --git a/lib/subordinateio.c b/lib/subordinateio.c
new file mode 100644
index 0000000..bd1af26
--- /dev/null
+++ b/lib/subordinateio.c
@@ -0,0 +1,1102 @@
+/*
+ * SPDX-FileCopyrightText: 2012 - Eric Biederman
+ */
+
+#include <config.h>
+
+#ifdef ENABLE_SUBIDS
+
+#include "prototypes.h"
+#include "defines.h"
+#include <stdio.h>
+#include "commonio.h"
+#include "subordinateio.h"
+#include "../libsubid/subid.h"
+#include <sys/types.h>
+#include <pwd.h>
+#include <ctype.h>
+#include <fcntl.h>
+
+#define ID_SIZE 31
+
+/*
+ * subordinate_dup: create a duplicate range
+ *
+ * @ent: a pointer to a subordinate_range struct
+ *
+ * Returns a pointer to a newly allocated duplicate subordinate_range struct
+ * or NULL on failure
+ */
+static /*@null@*/ /*@only@*/void *subordinate_dup (const void *ent)
+{
+	const struct subordinate_range *rangeent = ent;
+	struct subordinate_range *range;
+
+	range = (struct subordinate_range *) malloc (sizeof *range);
+	if (NULL == range) {
+		return NULL;
+	}
+	range->owner = strdup (rangeent->owner);
+	if (NULL == range->owner) {
+		free(range);
+		return NULL;
+	}
+	range->start = rangeent->start;
+	range->count = rangeent->count;
+
+	return range;
+}
+
+/*
+ * subordinate_free: free a subordinate_range struct
+ *
+ * @ent: pointer to a subordinate_range struct to free.
+ */
+static void subordinate_free (/*@out@*/ /*@only@*/void *ent)
+{
+	struct subordinate_range *rangeent = ent;
+
+	free ((void *)(rangeent->owner));
+	free (rangeent);
+}
+
+/*
+ * subordinate_parse:
+ *
+ * @line: a line to parse
+ *
+ * Returns a pointer to a subordinate_range struct representing the values
+ * in @line, or NULL on failure.  Note that the returned value should not
+ * be freed by the caller.
+ */
+static void *subordinate_parse (const char *line)
+{
+	static struct subordinate_range range;
+	static char rangebuf[1024];
+	int i;
+	char *cp;
+	char *fields[SUBID_NFIELDS];
+
+	/*
+	 * Copy the string to a temporary buffer so the substrings can
+	 * be modified to be NULL terminated.
+	 */
+	if (strlen (line) >= sizeof rangebuf)
+		return NULL;	/* fail if too long */
+	strcpy (rangebuf, line);
+
+	/*
+	 * Save a pointer to the start of each colon separated
+	 * field.  The fields are converted into NUL terminated strings.
+	 */
+
+	for (cp = rangebuf, i = 0; (i < SUBID_NFIELDS) && (NULL != cp); i++) {
+		fields[i] = cp;
+		while (('\0' != *cp) && (':' != *cp)) {
+			cp++;
+		}
+
+		if ('\0' != *cp) {
+			*cp = '\0';
+			cp++;
+		} else {
+			cp = NULL;
+		}
+	}
+
+	/*
+	 * There must be exactly SUBID_NFIELDS colon separated fields or
+	 * the entry is invalid.  Also, fields must be non-blank.
+	 */
+	if (i != SUBID_NFIELDS || *fields[0] == '\0' || *fields[1] == '\0' || *fields[2] == '\0')
+		return NULL;
+	range.owner = fields[0];
+	if (getulong (fields[1], &range.start) == 0)
+		return NULL;
+	if (getulong (fields[2], &range.count) == 0)
+		return NULL;
+
+	return &range;
+}
+
+/*
+ * subordinate_put: print a subordinate_range value to a file
+ *
+ * @ent: a pointer to a subordinate_range struct to print out.
+ * @file: file to which to print.
+ *
+ * Returns 0 on success, -1 on error.
+ */
+static int subordinate_put (const void *ent, FILE * file)
+{
+	const struct subordinate_range *range = ent;
+
+	return fprintf(file, "%s:%lu:%lu\n",
+			       range->owner,
+			       range->start,
+			       range->count) < 0 ? -1  : 0;
+}
+
+static struct commonio_ops subordinate_ops = {
+	subordinate_dup,	/* dup */
+	subordinate_free,	/* free */
+	NULL,			/* getname */
+	subordinate_parse,	/* parse */
+	subordinate_put,	/* put */
+	fgets,			/* fgets */
+	fputs,			/* fputs */
+	NULL,			/* open_hook */
+	NULL,			/* close_hook */
+};
+
+/*
+ * range_exists: Check whether @owner owns any ranges
+ *
+ * @db: database to query
+ * @owner: owner being queried
+ *
+ * Returns true if @owner owns any subuid ranges, false otherwise.
+ */
+static bool range_exists(struct commonio_db *db, const char *owner)
+{
+	const struct subordinate_range *range;
+	commonio_rewind(db);
+	while ((range = commonio_next(db)) != NULL) {
+		if (0 == strcmp(range->owner, owner))
+			return true;
+	}
+	return false;
+}
+
+/*
+ * find_range: find a range which @owner is authorized to use which includes
+ *             subuid @val.
+ *
+ * @db: database to query
+ * @owner: owning uid being queried
+ * @val: subuid being searched for.
+ *
+ * Returns a range of subuids belonging to @owner and including the subuid
+ * @val, or NULL if no such range exists.
+ */
+static const struct subordinate_range *find_range(struct commonio_db *db,
+						  const char *owner, unsigned long val)
+{
+	const struct subordinate_range *range;
+
+	/*
+	 * Search for exact username/group specification
+	 *
+	 * This is the original method - go fast through the db, doing only
+	 * exact username/group string comparison. Therefore we leave it as-is
+	 * for the time being, in order to keep it equally fast as it was
+	 * before.
+	 */
+	commonio_rewind(db);
+	while ((range = commonio_next(db)) != NULL) {
+		unsigned long first = range->start;
+		unsigned long last = first + range->count - 1;
+
+		if (0 != strcmp(range->owner, owner))
+			continue;
+
+		if ((val >= first) && (val <= last))
+			return range;
+	}
+
+
+        /*
+         * We only do special handling for these two files
+         */
+        if ((0 != strcmp(db->filename, "/etc/subuid")) && (0 != strcmp(db->filename, "/etc/subgid")))
+                return NULL;
+
+        /*
+         * Search loop above did not produce any result. Let's rerun it,
+         * but this time try to match actual UIDs. The first entry that
+         * matches is considered a success.
+         * (It may be specified as literal UID or as another username which
+         * has the same UID as the username we are looking for.)
+         */
+        struct passwd *pwd;
+        uid_t          owner_uid;
+        char           owner_uid_string[33] = "";
+
+
+        /* Get UID of the username we are looking for */
+        pwd = getpwnam(owner);
+        if (NULL == pwd) {
+                /* Username not defined in /etc/passwd, or error occurred during lookup */
+                return NULL;
+        }
+        owner_uid = pwd->pw_uid;
+        sprintf(owner_uid_string, "%lu", (unsigned long int)owner_uid);
+
+        commonio_rewind(db);
+        while ((range = commonio_next(db)) != NULL) {
+                unsigned long first = range->start;
+                unsigned long last = first + range->count - 1;
+
+                /* For performance reasons check range before using getpwnam() */
+                if ((val < first) || (val > last)) {
+                        continue;
+                }
+
+                /*
+                 * Range matches. Check if range owner is specified
+                 * as numeric UID and if it matches.
+                 */
+                if (0 == strcmp(range->owner, owner_uid_string)) {
+                        return range;
+                }
+
+                /*
+                 * Ok, this range owner is not specified as numeric UID
+                 * we are looking for. It may be specified as another
+                 * UID or as a literal username.
+                 *
+                 * If specified as another UID, the call to getpwnam()
+                 * will return NULL.
+                 *
+                 * If specified as literal username, we will get its
+                 * UID and compare that to UID we are looking for.
+                 */
+                const struct passwd *range_owner_pwd;
+
+                range_owner_pwd = getpwnam(range->owner);
+                if (NULL == range_owner_pwd) {
+                        continue;
+                }
+
+                if (owner_uid == range_owner_pwd->pw_uid) {
+                        return range;
+                }
+        }
+
+	return NULL;
+}
+
+/*
+ * have_range: check whether @owner is authorized to use the range
+ *             (@start .. @start+@count-1).
+ * @db: database to check
+ * @owner: owning uid being queried
+ * @start: start of range
+ * @count: number of uids in range
+ *
+ * Returns true if @owner is authorized to use the range, false otherwise.
+ */
+static bool have_range(struct commonio_db *db,
+		       const char *owner, unsigned long start, unsigned long count)
+{
+	const struct subordinate_range *range;
+	unsigned long end;
+
+	if (count == 0)
+		return false;
+
+	end = start + count - 1;
+	range = find_range (db, owner, start);
+	while (range) {
+		unsigned long last;
+
+		last = range->start + range->count - 1;
+		if (last >= (start + count - 1))
+			return true;
+
+		count = end - last;
+		start = last + 1;
+		range = find_range(db, owner, start);
+	}
+	return false;
+}
+
+static bool append_range(struct subid_range **ranges, const struct subordinate_range *new, int n)
+{
+	if (!*ranges) {
+		*ranges = malloc(sizeof(struct subid_range));
+		if (!*ranges)
+			return false;
+	} else {
+		struct subid_range *alloced;
+		alloced = realloc(*ranges, (n + 1) * (sizeof(struct subid_range)));
+		if (!alloced)
+			return false;
+		*ranges = alloced;
+	}
+	(*ranges)[n].start = new->start;
+	(*ranges)[n].count = new->count;
+	return true;
+}
+
+void free_subordinate_ranges(struct subordinate_range **ranges, int count)
+{
+	int i;
+
+	if (!ranges)
+		return;
+	for (i = 0; i < count; i++)
+		subordinate_free(ranges[i]);
+	free(ranges);
+}
+
+/*
+ * subordinate_range_cmp: compare uid ranges
+ *
+ * @p1: pointer to a commonio_entry struct to compare
+ * @p2: pointer to second commonio_entry struct to compare
+ *
+ * Returns 0 if the entries are the same.  Otherwise return -1
+ * if the range in p1 is lower than that in p2, or (if the ranges are
+ * equal) if the owning uid in p1 is lower than p2's.  Return 1 if p1's
+ * range or owning uid is great than p2's.
+ */
+static int subordinate_range_cmp (const void *p1, const void *p2)
+{
+	struct subordinate_range *range1, *range2;
+
+	if ((*(struct commonio_entry **) p1)->eptr == NULL)
+		return 1;
+	if ((*(struct commonio_entry **) p2)->eptr == NULL)
+		return -1;
+
+	range1 = ((struct subordinate_range *) (*(struct commonio_entry **) p1)->eptr);
+	range2 = ((struct subordinate_range *) (*(struct commonio_entry **) p2)->eptr);
+
+	if (range1->start < range2->start)
+		return -1;
+	else if (range1->start > range2->start)
+		return 1;
+	else if (range1->count < range2->count)
+		return -1;
+	else if (range1->count > range2->count)
+		return 1;
+	else
+		return strcmp(range1->owner, range2->owner);
+}
+
+/*
+ * find_free_range: find an unused consecutive sequence of ids to allocate
+ *                  to a user.
+ * @db: database to search
+ * @min: the first uid in the range to find
+ * @max: the highest uid to find
+ * @count: the number of uids needed
+ *
+ * Return the lowest new uid, or ULONG_MAX on failure.
+ */
+static unsigned long find_free_range(struct commonio_db *db,
+				     unsigned long min, unsigned long max,
+				     unsigned long count)
+{
+	const struct subordinate_range *range;
+	unsigned long low, high;
+
+	/* When given invalid parameters fail */
+	if ((count == 0) || (max < min))
+		goto fail;
+
+	/* Sort by range then by owner */
+	commonio_sort (db, subordinate_range_cmp);
+	commonio_rewind(db);
+
+	low = min;
+	while ((range = commonio_next(db)) != NULL) {
+		unsigned long first = range->start;
+		unsigned long last = first + range->count - 1;
+
+		/* Find the top end of the hole before this range */
+		high = first;
+
+		/* Don't allocate IDs after max (included) */
+		if (high > max + 1) {
+			high = max + 1;
+		}
+
+		/* Is the hole before this range large enough? */
+		if ((high > low) && ((high - low) >= count))
+			return low;
+
+		/* Compute the low end of the next hole */
+		if (low < (last + 1))
+			low = last + 1;
+		if (low > max)
+			goto fail;
+	}
+
+	/* Is the remaining unclaimed area large enough? */
+	if (((max - low) + 1) >= count)
+		return low;
+fail:
+	return ULONG_MAX;
+}
+
+/*
+ * add_range: add a subuid range to an owning uid's list of authorized
+ *            subuids.
+ * @db: database to which to add
+ * @owner: uid which owns the subuid
+ * @start: the first uid in the owned range
+ * @count: the number of uids in the range
+ *
+ * Return 1 if the range is already present or on success.  On error
+ * return 0 and set errno appropriately.
+ */
+static int add_range(struct commonio_db *db,
+	const char *owner, unsigned long start, unsigned long count)
+{
+	struct subordinate_range range;
+	range.owner = owner;
+	range.start = start;
+	range.count = count;
+
+	/* See if the range is already present */
+	if (have_range(db, owner, start, count))
+		return 1;
+
+	/* Otherwise append the range */
+	return commonio_append(db, &range);
+}
+
+/*
+ * remove_range:  remove a range of subuids from an owning uid's list
+ *                of authorized subuids.
+ * @db: database to work on
+ * @owner: owning uid whose range is being removed
+ * @start: start of the range to be removed
+ * @count: number of uids in the range.
+ *
+ * Returns 0 on failure, 1 on success.  Failure means that we needed to
+ * create a new range to represent the new limits, and failed doing so.
+ */
+static int remove_range (struct commonio_db *db,
+                         const char *owner,
+                         unsigned long start, unsigned long count)
+{
+	struct commonio_entry *ent;
+	unsigned long end;
+
+	if (count == 0) {
+		return 1;
+	}
+
+	end = start + count - 1;
+	for (ent = db->head; NULL != ent; ent = ent->next) {
+		struct subordinate_range *range = ent->eptr;
+		unsigned long first;
+		unsigned long last;
+
+		/* Skip unparsed entries */
+		if (NULL == range) {
+			continue;
+		}
+
+		first = range->start;
+		last = first + range->count - 1;
+
+		/* Skip entries with a different owner */
+		if (0 != strcmp (range->owner, owner)) {
+			continue;
+		}
+
+		/* Skip entries outside of the range to remove */
+		if ((end < first) || (start > last)) {
+			continue;
+		}
+
+		if (start <= first) {
+			if (end >= last) {
+				/* to be removed: [start,      end]
+				 * range:           [first, last] */
+				/* entry completely contained in the
+				 * range to remove */
+				commonio_del_entry (db, ent);
+			} else {
+				/* to be removed: [start,  end]
+				 * range:           [first, last] */
+				/* Remove only the start of the entry */
+				range->start = end + 1;
+				range->count = (last - range->start) + 1;
+
+				ent->changed = true;
+				db->changed = true;
+			}
+		} else {
+			if (end >= last) {
+				/* to be removed:   [start,  end]
+				 * range:         [first, last] */
+				/* Remove only the end of the entry */
+				range->count = start - range->start;
+
+				ent->changed = true;
+				db->changed = true;
+			} else {
+				/* to be removed:   [start, end]
+				 * range:         [first,    last] */
+				/* Remove the middle of the range
+				 * This requires to create a new range */
+				struct subordinate_range tail;
+				tail.owner = range->owner;
+				tail.start = end + 1;
+				tail.count = (last - tail.start) + 1;
+
+				if (commonio_append (db, &tail) == 0) {
+					return 0;
+				}
+
+				range->count = start - range->start;
+
+				ent->changed = true;
+				db->changed = true;
+			}
+		}
+	}
+
+	return 1;
+}
+
+static struct commonio_db subordinate_uid_db = {
+	"/etc/subuid",		/* filename */
+	&subordinate_ops,	/* ops */
+	NULL,			/* fp */
+#ifdef WITH_SELINUX
+	NULL,			/* scontext */
+#endif
+	0644,                   /* st_mode */
+	0,                      /* st_uid */
+	0,                      /* st_gid */
+	NULL,			/* head */
+	NULL,			/* tail */
+	NULL,			/* cursor */
+	false,			/* changed */
+	false,			/* isopen */
+	false,			/* locked */
+	false,			/* readonly */
+	false			/* setname */
+};
+
+int sub_uid_setdbname (const char *filename)
+{
+	return commonio_setname (&subordinate_uid_db, filename);
+}
+
+/*@observer@*/const char *sub_uid_dbname (void)
+{
+	return subordinate_uid_db.filename;
+}
+
+bool sub_uid_file_present (void)
+{
+	return commonio_present (&subordinate_uid_db);
+}
+
+int sub_uid_lock (void)
+{
+	return commonio_lock (&subordinate_uid_db);
+}
+
+int sub_uid_open (int mode)
+{
+	return commonio_open (&subordinate_uid_db, mode);
+}
+
+bool local_sub_uid_assigned(const char *owner)
+{
+	return range_exists (&subordinate_uid_db, owner);
+}
+
+bool have_sub_uids(const char *owner, uid_t start, unsigned long count)
+{
+	struct subid_nss_ops *h;
+	bool found;
+	enum subid_status status;
+	h = get_subid_nss_handle();
+	if (h) {
+		status = h->has_range(owner, start, count, ID_TYPE_UID, &found);
+		if (status == SUBID_STATUS_SUCCESS && found)
+			return true;
+		return false;
+	}
+	return have_range (&subordinate_uid_db, owner, start, count);
+}
+
+int sub_uid_add (const char *owner, uid_t start, unsigned long count)
+{
+	if (get_subid_nss_handle())
+		return -EOPNOTSUPP;
+	return add_range (&subordinate_uid_db, owner, start, count);
+}
+
+int sub_uid_remove (const char *owner, uid_t start, unsigned long count)
+{
+	if (get_subid_nss_handle())
+		return -EOPNOTSUPP;
+	return remove_range (&subordinate_uid_db, owner, start, count);
+}
+
+int sub_uid_close (void)
+{
+	return commonio_close (&subordinate_uid_db);
+}
+
+int sub_uid_unlock (void)
+{
+	return commonio_unlock (&subordinate_uid_db);
+}
+
+uid_t sub_uid_find_free_range(uid_t min, uid_t max, unsigned long count)
+{
+	unsigned long start;
+	start = find_free_range (&subordinate_uid_db, min, max, count);
+	return start == ULONG_MAX ? (uid_t) -1 : start;
+}
+
+static struct commonio_db subordinate_gid_db = {
+	"/etc/subgid",		/* filename */
+	&subordinate_ops,	/* ops */
+	NULL,			/* fp */
+#ifdef WITH_SELINUX
+	NULL,			/* scontext */
+#endif
+	0644,                   /* st_mode */
+	0,                      /* st_uid */
+	0,                      /* st_gid */
+	NULL,			/* head */
+	NULL,			/* tail */
+	NULL,			/* cursor */
+	false,			/* changed */
+	false,			/* isopen */
+	false,			/* locked */
+	false,			/* readonly */
+	false			/* setname */
+};
+
+int sub_gid_setdbname (const char *filename)
+{
+	return commonio_setname (&subordinate_gid_db, filename);
+}
+
+/*@observer@*/const char *sub_gid_dbname (void)
+{
+	return subordinate_gid_db.filename;
+}
+
+bool sub_gid_file_present (void)
+{
+	return commonio_present (&subordinate_gid_db);
+}
+
+int sub_gid_lock (void)
+{
+	return commonio_lock (&subordinate_gid_db);
+}
+
+int sub_gid_open (int mode)
+{
+	return commonio_open (&subordinate_gid_db, mode);
+}
+
+bool have_sub_gids(const char *owner, gid_t start, unsigned long count)
+{
+	struct subid_nss_ops *h;
+	bool found;
+	enum subid_status status;
+	h = get_subid_nss_handle();
+	if (h) {
+		status = h->has_range(owner, start, count, ID_TYPE_GID, &found);
+		if (status == SUBID_STATUS_SUCCESS && found)
+			return true;
+		return false;
+	}
+	return have_range(&subordinate_gid_db, owner, start, count);
+}
+
+bool local_sub_gid_assigned(const char *owner)
+{
+	return range_exists (&subordinate_gid_db, owner);
+}
+
+int sub_gid_add (const char *owner, gid_t start, unsigned long count)
+{
+	if (get_subid_nss_handle())
+		return -EOPNOTSUPP;
+	return add_range (&subordinate_gid_db, owner, start, count);
+}
+
+int sub_gid_remove (const char *owner, gid_t start, unsigned long count)
+{
+	if (get_subid_nss_handle())
+		return -EOPNOTSUPP;
+	return remove_range (&subordinate_gid_db, owner, start, count);
+}
+
+int sub_gid_close (void)
+{
+	return commonio_close (&subordinate_gid_db);
+}
+
+int sub_gid_unlock (void)
+{
+	return commonio_unlock (&subordinate_gid_db);
+}
+
+gid_t sub_gid_find_free_range(gid_t min, gid_t max, unsigned long count)
+{
+	unsigned long start;
+	start = find_free_range (&subordinate_gid_db, min, max, count);
+	return start == ULONG_MAX ? (gid_t) -1 : start;
+}
+
+static bool get_owner_id(const char *owner, enum subid_type id_type, char *id)
+{
+	struct passwd *pw;
+	struct group *gr;
+	int ret = 0;
+
+	switch (id_type) {
+	case ID_TYPE_UID:
+		pw = getpwnam(owner);
+		if (pw == NULL) {
+			return false;
+		}
+		ret = snprintf(id, ID_SIZE, "%u", pw->pw_uid);
+		if (ret < 0 || ret >= ID_SIZE) {
+			return false;
+		}
+		break;
+	case ID_TYPE_GID:
+		gr = getgrnam(owner);
+		if (gr == NULL) {
+			return false;
+		}
+		ret = snprintf(id, ID_SIZE, "%u", gr->gr_gid);
+		if (ret < 0 || ret >= ID_SIZE) {
+			return false;
+		}
+		break;
+	default:
+		return false;
+	}
+
+	return true;
+}
+
+/*
+ * int list_owner_ranges(const char *owner, enum subid_type id_type, struct subordinate_range ***ranges)
+ *
+ * @owner: username
+ * @id_type: UID or GUID
+ * @ranges: pointer to array of ranges into which results will be placed.
+ *
+ * Fills in the subuid or subgid ranges which are owned by the specified
+ * user.  Username may be a username or a string representation of a
+ * UID number.  If id_type is UID, then subuids are returned, else
+ * subgids are given.
+
+ * Returns the number of ranges found, or < 0 on error.
+ *
+ * The caller must free the subordinate range list.
+ */
+int list_owner_ranges(const char *owner, enum subid_type id_type, struct subid_range **in_ranges)
+{
+	// TODO - need to handle owner being either uid or username
+	struct subid_range *ranges = NULL;
+	const struct subordinate_range *range;
+	struct commonio_db *db;
+	enum subid_status status;
+	int count = 0;
+	struct subid_nss_ops *h;
+	char id[ID_SIZE];
+	bool have_owner_id;
+
+	*in_ranges = NULL;
+
+	h = get_subid_nss_handle();
+	if (h) {
+		status = h->list_owner_ranges(owner, id_type, in_ranges, &count);
+		if (status == SUBID_STATUS_SUCCESS)
+			return count;
+		return -1;
+	}
+
+	switch (id_type) {
+	case ID_TYPE_UID:
+		if (!sub_uid_open(O_RDONLY)) {
+			return -1;
+		}
+		db = &subordinate_uid_db;
+		break;
+	case ID_TYPE_GID:
+		if (!sub_gid_open(O_RDONLY)) {
+			return -1;
+		}
+		db = &subordinate_gid_db;
+		break;
+	default:
+		return -1;
+	}
+
+	have_owner_id = get_owner_id(owner, id_type, id);
+
+	commonio_rewind(db);
+	while ((range = commonio_next(db)) != NULL) {
+		if (0 == strcmp(range->owner, owner)) {
+			if (!append_range(&ranges, range, count++)) {
+				free(ranges);
+				ranges = NULL;
+				count = -1;
+				goto out;
+			}
+		}
+
+		// Let's also compare with the ID
+		if (have_owner_id == true && 0 == strcmp(range->owner, id)) {
+			if (!append_range(&ranges, range, count++)) {
+				free(ranges);
+				ranges = NULL;
+				count = -1;
+				goto out;
+			}
+		}
+	}
+
+out:
+	if (id_type == ID_TYPE_UID)
+		sub_uid_close();
+	else
+		sub_gid_close();
+
+	*in_ranges = ranges;
+	return count;
+}
+
+static bool all_digits(const char *str)
+{
+	int i;
+
+	for (i = 0; str[i] != '\0'; i++)
+		if (!isdigit(str[i]))
+			return false;
+	return true;
+}
+
+static int append_uids(uid_t **uids, const char *owner, int n)
+{
+	uid_t owner_uid;
+	uid_t *ret;
+	int i;
+
+	if (all_digits(owner)) {
+		i = sscanf(owner, "%d", &owner_uid);
+		if (i != 1) {
+			// should not happen
+			free(*uids);
+			*uids = NULL;
+			return -1;
+		}
+	} else {
+		struct passwd *pwd = getpwnam(owner);
+		if (NULL == pwd) {
+			/* Username not defined in /etc/passwd, or error occurred during lookup */
+			free(*uids);
+			*uids = NULL;
+			return -1;
+		}
+		owner_uid = pwd->pw_uid;
+	}
+
+	for (i = 0; i < n; i++) {
+		if (owner_uid == (*uids)[i])
+			return n;
+	}
+
+	ret = realloc(*uids, (n + 1) * sizeof(uid_t));
+	if (!ret) {
+		free(*uids);
+		return -1;
+	}
+	ret[n] = owner_uid;
+	*uids = ret;
+	return n+1;
+}
+
+int find_subid_owners(unsigned long id, enum subid_type id_type, uid_t **uids)
+{
+	const struct subordinate_range *range;
+	struct subid_nss_ops *h;
+	enum subid_status status;
+	struct commonio_db *db;
+	int n = 0;
+
+	h = get_subid_nss_handle();
+	if (h) {
+		status = h->find_subid_owners(id, id_type, uids, &n);
+		// Several ways we could handle the error cases here.
+		if (status != SUBID_STATUS_SUCCESS)
+			return -1;
+		return n;
+	}
+
+	switch (id_type) {
+	case ID_TYPE_UID:
+		if (!sub_uid_open(O_RDONLY)) {
+			return -1;
+		}
+		db = &subordinate_uid_db;
+		break;
+	case ID_TYPE_GID:
+		if (!sub_gid_open(O_RDONLY)) {
+			return -1;
+		}
+		db = &subordinate_gid_db;
+		break;
+	default:
+		return -1;
+	}
+
+	*uids = NULL;
+
+	commonio_rewind(db);
+	while ((range = commonio_next(db)) != NULL) {
+		if (id >= range->start && id < range->start + range-> count) {
+			n = append_uids(uids, range->owner, n);
+			if (n < 0)
+				break;
+		}
+	}
+
+	if (id_type == ID_TYPE_UID)
+		sub_uid_close();
+	else
+		sub_gid_close();
+
+	return n;
+}
+
+bool new_subid_range(struct subordinate_range *range, enum subid_type id_type, bool reuse)
+{
+	struct commonio_db *db;
+	const struct subordinate_range *r;
+	bool ret;
+
+	if (get_subid_nss_handle())
+		return false;
+
+	switch (id_type) {
+	case ID_TYPE_UID:
+		if (!sub_uid_lock()) {
+			printf("Failed loging subuids (errno %d)\n", errno);
+			return false;
+		}
+		if (!sub_uid_open(O_CREAT | O_RDWR)) {
+			printf("Failed opening subuids (errno %d)\n", errno);
+			sub_uid_unlock();
+			return false;
+		}
+		db = &subordinate_uid_db;
+		break;
+	case ID_TYPE_GID:
+		if (!sub_gid_lock()) {
+			printf("Failed loging subgids (errno %d)\n", errno);
+			return false;
+		}
+		if (!sub_gid_open(O_CREAT | O_RDWR)) {
+			printf("Failed opening subgids (errno %d)\n", errno);
+			sub_gid_unlock();
+			return false;
+		}
+		db = &subordinate_gid_db;
+		break;
+	default:
+		return false;
+	}
+
+	commonio_rewind(db);
+	if (reuse) {
+		while ((r = commonio_next(db)) != NULL) {
+			// TODO account for username vs uid_t
+			if (0 != strcmp(r->owner, range->owner))
+				continue;
+			if (r->count >= range->count) {
+				range->count = r->count;
+				range->start = r->start;
+				return true;
+			}
+		}
+	}
+
+	range->start = find_free_range(db, range->start, ULONG_MAX, range->count);
+
+	if (range->start == ULONG_MAX) {
+		ret = false;
+		goto out;
+	}
+
+	ret = add_range(db, range->owner, range->start, range->count) == 1;
+
+out:
+	if (id_type == ID_TYPE_UID) {
+		sub_uid_close();
+		sub_uid_unlock();
+	} else {
+		sub_gid_close();
+		sub_gid_unlock();
+	}
+
+	return ret;
+}
+
+bool release_subid_range(struct subordinate_range *range, enum subid_type id_type)
+{
+	struct commonio_db *db;
+	bool ret;
+
+	if (get_subid_nss_handle())
+		return false;
+
+	switch (id_type) {
+	case ID_TYPE_UID:
+		if (!sub_uid_lock()) {
+			printf("Failed loging subuids (errno %d)\n", errno);
+			return false;
+		}
+		if (!sub_uid_open(O_CREAT | O_RDWR)) {
+			printf("Failed opening subuids (errno %d)\n", errno);
+			sub_uid_unlock();
+			return false;
+		}
+		db = &subordinate_uid_db;
+		break;
+	case ID_TYPE_GID:
+		if (!sub_gid_lock()) {
+			printf("Failed loging subgids (errno %d)\n", errno);
+			return false;
+		}
+		if (!sub_gid_open(O_CREAT | O_RDWR)) {
+			printf("Failed opening subgids (errno %d)\n", errno);
+			sub_gid_unlock();
+			return false;
+		}
+		db = &subordinate_gid_db;
+		break;
+	default:
+		return false;
+	}
+
+	ret = remove_range(db, range->owner, range->start, range->count) == 1;
+
+	if (id_type == ID_TYPE_UID) {
+		sub_uid_close();
+		sub_uid_unlock();
+	} else {
+		sub_gid_close();
+		sub_gid_unlock();
+	}
+
+	return ret;
+}
+
+#else				/* !ENABLE_SUBIDS */
+extern int errno;		/* warning: ANSI C forbids an empty source file */
+#endif				/* !ENABLE_SUBIDS */
+
diff --git a/lib/subordinateio.h b/lib/subordinateio.h
new file mode 100644
index 0000000..d32733d
--- /dev/null
+++ b/lib/subordinateio.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2012- Eric W. Biederman
+ */
+
+#ifndef _SUBORDINATEIO_H
+#define _SUBORDINATEIO_H
+
+#include <config.h>
+
+#ifdef ENABLE_SUBIDS
+
+#include <sys/types.h>
+
+#include "../libsubid/subid.h"
+
+extern int sub_uid_close(void);
+extern bool have_sub_uids(const char *owner, uid_t start, unsigned long count);
+extern bool sub_uid_file_present (void);
+extern bool local_sub_uid_assigned(const char *owner);
+extern int sub_uid_lock (void);
+extern int sub_uid_setdbname (const char *filename);
+extern /*@observer@*/const char *sub_uid_dbname (void);
+extern int sub_uid_open (int mode);
+extern int sub_uid_unlock (void);
+extern int sub_uid_add (const char *owner, uid_t start, unsigned long count);
+extern int sub_uid_remove (const char *owner, uid_t start, unsigned long count);
+extern uid_t sub_uid_find_free_range(uid_t min, uid_t max, unsigned long count);
+extern int list_owner_ranges(const char *owner, enum subid_type id_type, struct subid_range **ranges);
+extern bool new_subid_range(struct subordinate_range *range, enum subid_type id_type, bool reuse);
+extern bool release_subid_range(struct subordinate_range *range, enum subid_type id_type);
+extern int find_subid_owners(unsigned long id, enum subid_type id_type, uid_t **uids);
+extern void free_subordinate_ranges(struct subordinate_range **ranges, int count);
+
+extern int sub_gid_close(void);
+extern bool have_sub_gids(const char *owner, gid_t start, unsigned long count);
+extern bool sub_gid_file_present (void);
+extern bool local_sub_gid_assigned(const char *owner);
+extern int sub_gid_lock (void);
+extern int sub_gid_setdbname (const char *filename);
+extern /*@observer@*/const char *sub_gid_dbname (void);
+extern int sub_gid_open (int mode);
+extern int sub_gid_unlock (void);
+extern int sub_gid_add (const char *owner, gid_t start, unsigned long count);
+extern int sub_gid_remove (const char *owner, gid_t start, unsigned long count);
+extern uid_t sub_gid_find_free_range(gid_t min, gid_t max, unsigned long count);
+#endif				/* ENABLE_SUBIDS */
+
+#endif
diff --git a/lib/tcbfuncs.c b/lib/tcbfuncs.c
new file mode 100644
index 0000000..1ed5d03
--- /dev/null
+++ b/lib/tcbfuncs.c
@@ -0,0 +1,604 @@
+/*
+ * SPDX-FileCopyrightText: 2001 Rafal Wojtczuk, Solar Designer
+ * SPDX-License-Identifier: 0BSD
+ */
+
+#define _GNU_SOURCE
+
+#include <errno.h>
+#include <fcntl.h>
+#include <grp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <tcb.h>
+#include <unistd.h>
+
+#include "config.h"
+
+#include "defines.h"
+#include "prototypes.h"
+#include "getdef.h"
+#include "shadowio.h"
+#include "tcbfuncs.h"
+
+#include "shadowlog_internal.h"
+
+#define SHADOWTCB_HASH_BY 1000
+#define SHADOWTCB_LOCK_SUFFIX ".lock"
+
+static /*@null@*//*@only@*/char *stored_tcb_user = NULL;
+
+shadowtcb_status shadowtcb_drop_priv (void)
+{
+	if (!getdef_bool ("USE_TCB")) {
+		return SHADOWTCB_SUCCESS;
+	}
+
+	if (NULL != stored_tcb_user) {
+		if (tcb_drop_priv (stored_tcb_user) == 0) {
+			return SHADOWTCB_SUCCESS;
+		}
+	}
+
+	return SHADOWTCB_FAILURE;
+}
+
+shadowtcb_status shadowtcb_gain_priv (void)
+{
+	if (!getdef_bool ("USE_TCB")) {
+		return SHADOWTCB_SUCCESS;
+	}
+
+	return (tcb_gain_priv () == 0) ? SHADOWTCB_SUCCESS : SHADOWTCB_FAILURE;
+}
+
+/* In case something goes wrong, we return immediately, not polluting the
+ * code with free(). All errors are fatal, so the application is expected
+ * to exit soon.
+ */
+#define OUT_OF_MEMORY do { \
+	fprintf (shadow_logfd, _("%s: out of memory\n"), shadow_progname); \
+	(void) fflush (shadow_logfd); \
+} while (false)
+
+/* Returns user's tcb directory path relative to TCB_DIR. */
+static /*@null@*/ char *shadowtcb_path_rel (const char *name, uid_t uid)
+{
+	char *ret;
+
+	if (!getdef_bool ("TCB_SYMLINKS") || uid < SHADOWTCB_HASH_BY) {
+		if (asprintf (&ret, "%s", name) == -1) {
+			OUT_OF_MEMORY;
+			return NULL;
+		}
+	} else if (uid < SHADOWTCB_HASH_BY * SHADOWTCB_HASH_BY) {
+		if (asprintf (&ret, ":%dK/%s",
+		              uid / SHADOWTCB_HASH_BY, name) == -1) {
+			OUT_OF_MEMORY;
+			return NULL;
+		}
+	} else {
+		if (asprintf (&ret, ":%dM/:%dK/%s",
+		              uid / (SHADOWTCB_HASH_BY * SHADOWTCB_HASH_BY),
+		              (uid % (SHADOWTCB_HASH_BY * SHADOWTCB_HASH_BY)) / SHADOWTCB_HASH_BY,
+			name) == -1) {
+			OUT_OF_MEMORY;
+			return NULL;
+		}
+	}
+	return ret;
+}
+
+static /*@null@*/ char *shadowtcb_path_rel_existing (const char *name)
+{
+	char *path, *rval;
+	struct stat st;
+	char link[8192];
+	ssize_t ret;
+
+	if (asprintf (&path, TCB_DIR "/%s", name) == -1) {
+		OUT_OF_MEMORY;
+		return NULL;
+	}
+	if (lstat (path, &st) != 0) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot stat %s: %s\n"),
+		         shadow_progname, path, strerror (errno));
+		free (path);
+		return NULL;
+	}
+	if (S_ISDIR (st.st_mode)) {
+		free (path);
+		rval = strdup (name);
+		if (NULL == rval) {
+			OUT_OF_MEMORY;
+			return NULL;
+		}
+		return rval;
+	}
+	if (!S_ISLNK (st.st_mode)) {
+		fprintf (shadow_logfd,
+		         _("%s: %s is neither a directory, nor a symlink.\n"),
+		         shadow_progname, path);
+		free (path);
+		return NULL;
+	}
+	ret = readlink (path, link, sizeof (link) - 1);
+	if (-1 == ret) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot read symbolic link %s: %s\n"),
+		         shadow_progname, path, strerror (errno));
+		free (path);
+		return NULL;
+	}
+	free (path);
+	if ((size_t)ret >= sizeof(link) - 1) {
+		link[sizeof(link) - 1] = '\0';
+		fprintf (shadow_logfd,
+		         _("%s: Suspiciously long symlink: %s\n"),
+		         shadow_progname, link);
+		return NULL;
+	}
+	link[(size_t)ret] = '\0';
+	rval = strdup (link);
+	if (NULL == rval) {
+		OUT_OF_MEMORY;
+		return NULL;
+	}
+	return rval;
+}
+
+static /*@null@*/ char *shadowtcb_path (const char *name, uid_t uid)
+{
+	char *ret, *rel;
+
+	rel = shadowtcb_path_rel (name, uid);
+	if (NULL == rel) {
+		return NULL;
+	}
+	if (asprintf (&ret, TCB_DIR "/%s", rel) == -1) {
+		OUT_OF_MEMORY;
+		free (rel);
+		return NULL;
+	}
+	free (rel);
+	return ret;
+}
+
+static /*@null@*/ char *shadowtcb_path_existing (const char *name)
+{
+	char *ret, *rel;
+
+	rel = shadowtcb_path_rel_existing (name);
+	if (NULL == rel) {
+		return NULL;
+	}
+	if (asprintf (&ret, TCB_DIR "/%s", rel) == -1) {
+		OUT_OF_MEMORY;
+		free (rel);
+		return NULL;
+	}
+	free (rel);
+	return ret;
+}
+
+static shadowtcb_status mkdir_leading (const char *name, uid_t uid)
+{
+	char *ind, *dir, *ptr, *path = shadowtcb_path_rel (name, uid);
+	struct stat st;
+
+	if (NULL == path) {
+		return SHADOWTCB_FAILURE;
+	}
+	ptr = path;
+	if (stat (TCB_DIR, &st) != 0) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot stat %s: %s\n"),
+		         shadow_progname, TCB_DIR, strerror (errno));
+		goto out_free_path;
+	}
+	while ((ind = strchr (ptr, '/'))) {
+		*ind = '\0';
+		if (asprintf (&dir, TCB_DIR "/%s", path) == -1) {
+			OUT_OF_MEMORY;
+			return SHADOWTCB_FAILURE;
+		}
+		if ((mkdir (dir, 0700) != 0) && (errno != EEXIST)) {
+			fprintf (shadow_logfd,
+			         _("%s: Cannot create directory %s: %s\n"),
+			         shadow_progname, dir, strerror (errno));
+			goto out_free_dir;
+		}
+		if (chown (dir, 0, st.st_gid) != 0) {
+			fprintf (shadow_logfd,
+			         _("%s: Cannot change owner of %s: %s\n"),
+			         shadow_progname, dir, strerror (errno));
+			goto out_free_dir;
+		}
+		if (chmod (dir, 0711) != 0) {
+			fprintf (shadow_logfd,
+			         _("%s: Cannot change mode of %s: %s\n"),
+			         shadow_progname, dir, strerror (errno));
+			goto out_free_dir;
+		}
+		free (dir);
+		*ind = '/';
+		ptr = ind + 1;
+	}
+	free (path);
+	return SHADOWTCB_SUCCESS;
+out_free_dir:
+	free (dir);
+out_free_path:
+	free (path);
+	return SHADOWTCB_FAILURE;
+}
+
+static shadowtcb_status unlink_suffs (const char *user)
+{
+	static char *suffs[] = { "+", "-", SHADOWTCB_LOCK_SUFFIX };
+	char *tmp;
+	int i;
+
+	for (i = 0; i < 3; i++) {
+		if (asprintf (&tmp, TCB_FMT "%s", user, suffs[i]) == -1) {
+			OUT_OF_MEMORY;
+			return SHADOWTCB_FAILURE;
+		}
+		if ((unlink (tmp) != 0) && (errno != ENOENT)) {
+			fprintf (shadow_logfd,
+			         _("%s: unlink: %s: %s\n"),
+			         shadow_progname, tmp, strerror (errno));
+			free (tmp);
+			return SHADOWTCB_FAILURE;
+		}
+		free (tmp);
+	}
+
+	return SHADOWTCB_SUCCESS;
+}
+
+/* path should be a relative existing tcb directory */
+static shadowtcb_status rmdir_leading (char *path)
+{
+	char *ind, *dir;
+	shadowtcb_status ret = SHADOWTCB_SUCCESS;
+	while ((ind = strrchr (path, '/'))) {
+		*ind = '\0';
+		if (asprintf (&dir, TCB_DIR "/%s", path) == -1) {
+			OUT_OF_MEMORY;
+			return SHADOWTCB_FAILURE;
+		}
+		if (rmdir (dir) != 0) {
+			if (errno != ENOTEMPTY) {
+				fprintf (shadow_logfd,
+				         _("%s: Cannot remove directory %s: %s\n"),
+				         shadow_progname, dir, strerror (errno));
+				ret = SHADOWTCB_FAILURE;
+			}
+			free (dir);
+			break;
+		}
+		free (dir);
+	}
+	return ret;
+}
+
+static shadowtcb_status move_dir (const char *user_newname, uid_t user_newid)
+{
+	char *olddir = NULL, *newdir = NULL;
+	char *real_old_dir = NULL, *real_new_dir = NULL;
+	char *real_old_dir_rel = NULL, *real_new_dir_rel = NULL;
+	uid_t old_uid, the_newid;
+	struct stat oldmode;
+	shadowtcb_status ret = SHADOWTCB_FAILURE;
+
+	if (NULL == stored_tcb_user) {
+		return SHADOWTCB_FAILURE;
+	}
+	if (asprintf (&olddir, TCB_DIR "/%s", stored_tcb_user) == -1) {
+		goto out_free_nomem;
+	}
+	if (stat (olddir, &oldmode) != 0) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot stat %s: %s\n"),
+		         shadow_progname, olddir, strerror (errno));
+		goto out_free;
+	}
+	old_uid = oldmode.st_uid;
+	the_newid = (user_newid == -1) ? old_uid : user_newid;
+	real_old_dir = shadowtcb_path_existing (stored_tcb_user);
+	if (NULL == real_old_dir) {
+		goto out_free;
+	}
+	real_new_dir = shadowtcb_path (user_newname, the_newid);
+	if (NULL == real_new_dir) {
+		goto out_free;
+	}
+	if (strcmp (real_old_dir, real_new_dir) == 0) {
+		ret = SHADOWTCB_SUCCESS;
+		goto out_free;
+	}
+	real_old_dir_rel = shadowtcb_path_rel_existing (stored_tcb_user);
+	if (NULL == real_old_dir_rel) {
+		goto out_free;
+	}
+	if (mkdir_leading (user_newname, the_newid) == SHADOWTCB_FAILURE) {
+		goto out_free;
+	}
+	if (rename (real_old_dir, real_new_dir) != 0) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot rename %s to %s: %s\n"),
+		         shadow_progname, real_old_dir, real_new_dir, strerror (errno));
+		goto out_free;
+	}
+	if (rmdir_leading (real_old_dir_rel) == SHADOWTCB_FAILURE) {
+		goto out_free;
+	}
+	if ((unlink (olddir) != 0) && (errno != ENOENT)) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot remove %s: %s\n"),
+		         shadow_progname, olddir, strerror (errno));
+		goto out_free;
+	}
+	if (asprintf (&newdir, TCB_DIR "/%s", user_newname) == -1) {
+		goto out_free_nomem;
+	}
+	real_new_dir_rel = shadowtcb_path_rel (user_newname, the_newid);
+	if (NULL == real_new_dir_rel) {
+		goto out_free;
+	}
+	if (   (strcmp (real_new_dir, newdir) != 0)
+	    && (symlink (real_new_dir_rel, newdir) != 0)) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot create symbolic link %s: %s\n"),
+		         shadow_progname, real_new_dir_rel, strerror (errno));
+		goto out_free;
+	}
+	ret = SHADOWTCB_SUCCESS;
+	goto out_free;
+out_free_nomem:
+	OUT_OF_MEMORY;
+out_free:
+	free (olddir);
+	free (newdir);
+	free (real_old_dir);
+	free (real_new_dir);
+	free (real_old_dir_rel);
+	free (real_new_dir_rel);
+	return ret;
+}
+
+shadowtcb_status shadowtcb_set_user (const char* name)
+{
+	char *buf;
+	shadowtcb_status retval;
+
+	if (!getdef_bool ("USE_TCB")) {
+		return SHADOWTCB_SUCCESS;
+	}
+
+	free (stored_tcb_user);
+
+	stored_tcb_user = strdup (name);
+	if (NULL == stored_tcb_user) {
+		OUT_OF_MEMORY;
+		return SHADOWTCB_FAILURE;
+	}
+	if (asprintf (&buf, TCB_FMT, name) == -1) {
+		OUT_OF_MEMORY;
+		return SHADOWTCB_FAILURE;
+	}
+
+	retval = (spw_setdbname (buf) != 0) ? SHADOWTCB_SUCCESS : SHADOWTCB_FAILURE;
+	free (buf);
+	return retval;
+}
+
+/* tcb directory must be empty before shadowtcb_remove is called. */
+shadowtcb_status shadowtcb_remove (const char *name)
+{
+	shadowtcb_status ret = SHADOWTCB_SUCCESS;
+	char *path = shadowtcb_path_existing (name);
+	char *rel = shadowtcb_path_rel_existing (name);
+	if ((NULL == path) || (NULL == rel) || (rmdir (path) != 0)) {
+		return SHADOWTCB_FAILURE;
+	}
+	if (rmdir_leading (rel) == SHADOWTCB_FAILURE) {
+		return SHADOWTCB_FAILURE;
+	}
+	free (path);
+	free (rel);
+	if (asprintf (&path, TCB_DIR "/%s", name) == -1) {
+		OUT_OF_MEMORY;
+		return SHADOWTCB_FAILURE;
+	}
+	if ((unlink (path) != 0) && (errno != ENOENT)) {
+		ret = SHADOWTCB_FAILURE;
+	}
+	free (path);
+	return ret;
+}
+
+shadowtcb_status shadowtcb_move (/*@NULL@*/const char *user_newname, uid_t user_newid)
+{
+	struct stat dirmode, filemode;
+	char *tcbdir, *shadow;
+	shadowtcb_status ret = SHADOWTCB_FAILURE;
+
+	if (!getdef_bool ("USE_TCB")) {
+		return SHADOWTCB_SUCCESS;
+	}
+	if (NULL == stored_tcb_user) {
+		return SHADOWTCB_FAILURE;
+	}
+	if (NULL == user_newname) {
+		user_newname = stored_tcb_user;
+	}
+	if (move_dir (user_newname, user_newid) == SHADOWTCB_FAILURE) {
+		return SHADOWTCB_FAILURE;
+	}
+	if (-1 == user_newid) {
+		return SHADOWTCB_SUCCESS;
+	}
+	if (   (asprintf (&tcbdir, TCB_DIR "/%s", user_newname) == -1)
+	    || (asprintf (&shadow, TCB_FMT, user_newname) == -1)) {
+		OUT_OF_MEMORY;
+		return SHADOWTCB_FAILURE;
+	}
+	if (stat (tcbdir, &dirmode) != 0) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot stat %s: %s\n"),
+		         shadow_progname, tcbdir, strerror (errno));
+		goto out_free;
+	}
+	if (chown (tcbdir, 0, 0) != 0) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot change owners of %s: %s\n"),
+		         shadow_progname, tcbdir, strerror (errno));
+		goto out_free;
+	}
+	if (chmod (tcbdir, 0700) != 0) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot change mode of %s: %s\n"),
+		         shadow_progname, tcbdir, strerror (errno));
+		goto out_free;
+	}
+	if (lstat (shadow, &filemode) != 0) {
+		if (errno != ENOENT) {
+			fprintf (shadow_logfd,
+			         _("%s: Cannot lstat %s: %s\n"),
+			         shadow_progname, shadow, strerror (errno));
+			goto out_free;
+		}
+		fprintf (shadow_logfd,
+		         _("%s: Warning, user %s has no tcb shadow file.\n"),
+		         shadow_progname, user_newname);
+	} else {
+		if (!S_ISREG (filemode.st_mode) ||
+			filemode.st_nlink != 1) {
+			fprintf (shadow_logfd,
+			         _("%s: Emergency: %s's tcb shadow is not a "
+			           "regular file with st_nlink=1.\n"
+			           "The account is left locked.\n"),
+			         shadow_progname, user_newname);
+			goto out_free;
+		}
+		if (chown (shadow, user_newid, filemode.st_gid) != 0) {
+			fprintf (shadow_logfd,
+			         _("%s: Cannot change owner of %s: %s\n"),
+			         shadow_progname, shadow, strerror (errno));
+			goto out_free;
+		}
+		if (chmod (shadow, filemode.st_mode & 07777) != 0) {
+			fprintf (shadow_logfd,
+			         _("%s: Cannot change mode of %s: %s\n"),
+			         shadow_progname, shadow, strerror (errno));
+			goto out_free;
+		}
+	}
+	if (unlink_suffs (user_newname) == SHADOWTCB_FAILURE) {
+		goto out_free;
+	}
+	if (chown (tcbdir, user_newid, dirmode.st_gid) != 0) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot change owner of %s: %s\n"),
+		         shadow_progname, tcbdir, strerror (errno));
+		goto out_free;
+	}
+	if (chmod (tcbdir, dirmode.st_mode & 07777) != 0) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot change mode of %s: %s\n"),
+		         shadow_progname, tcbdir, strerror (errno));
+		goto out_free;
+	}
+	ret = SHADOWTCB_SUCCESS;
+out_free:
+	free (tcbdir);
+	free (shadow);
+	return ret;
+}
+
+shadowtcb_status shadowtcb_create (const char *name, uid_t uid)
+{
+	char *dir, *shadow;
+	struct stat tcbdir_stat;
+	gid_t shadowgid, authgid;
+	struct group *gr;
+	int fd;
+	shadowtcb_status ret = SHADOWTCB_FAILURE;
+
+	if (!getdef_bool ("USE_TCB")) {
+		return SHADOWTCB_SUCCESS;
+	}
+	if (stat (TCB_DIR, &tcbdir_stat) != 0) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot stat %s: %s\n"),
+		         shadow_progname, TCB_DIR, strerror (errno));
+		return SHADOWTCB_FAILURE;
+	}
+	shadowgid = tcbdir_stat.st_gid;
+	authgid = shadowgid;
+	if (getdef_bool ("TCB_AUTH_GROUP")) {
+		gr = getgrnam ("auth");
+		if (NULL != gr) {
+			authgid = gr->gr_gid;
+		}
+	}
+
+	if (   (asprintf (&dir, TCB_DIR "/%s", name) == -1)
+	    || (asprintf (&shadow, TCB_FMT, name) == -1)) {
+		OUT_OF_MEMORY;
+		return SHADOWTCB_FAILURE;
+	}
+	if (mkdir (dir, 0700) != 0) {
+		fprintf (shadow_logfd,
+		         _("%s: mkdir: %s: %s\n"),
+		         shadow_progname, dir, strerror (errno));
+		goto out_free;
+	}
+	fd = open (shadow, O_RDWR | O_CREAT | O_TRUNC, 0600);
+	if (fd < 0) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot open %s: %s\n"),
+		         shadow_progname, shadow, strerror (errno));
+		goto out_free;
+	}
+	close (fd);
+	if (chown (shadow, 0, authgid) != 0) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot change owner of %s: %s\n"),
+		         shadow_progname, shadow, strerror (errno));
+		goto out_free;
+	}
+	if (chmod (shadow, (mode_t) ((authgid == shadowgid) ? 0600 : 0640)) != 0) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot change mode of %s: %s\n"),
+		         shadow_progname, shadow, strerror (errno));
+		goto out_free;
+	}
+	if (chown (dir, 0, authgid) != 0) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot change owner of %s: %s\n"),
+		         shadow_progname, dir, strerror (errno));
+		goto out_free;
+	}
+	if (chmod (dir, (mode_t) ((authgid == shadowgid) ? 02700 : 02710)) != 0) {
+		fprintf (shadow_logfd,
+		         _("%s: Cannot change mode of %s: %s\n"),
+		         shadow_progname, dir, strerror (errno));
+		goto out_free;
+	}
+	if (   (shadowtcb_set_user (name) == SHADOWTCB_FAILURE)
+	    || (shadowtcb_move (NULL, uid) == SHADOWTCB_FAILURE)) {
+		goto out_free;
+	}
+	ret = SHADOWTCB_SUCCESS;
+out_free:
+	free (dir);
+	free (shadow);
+	return ret;
+}
+
diff --git a/lib/tcbfuncs.h b/lib/tcbfuncs.h
new file mode 100644
index 0000000..6324bc1
--- /dev/null
+++ b/lib/tcbfuncs.h
@@ -0,0 +1,19 @@
+#ifndef _TCBFUNCS_H
+#define _TCBFUNCS_H
+
+#include <sys/types.h>
+
+typedef enum {
+	SHADOWTCB_FAILURE = 0,
+	SHADOWTCB_SUCCESS = 1
+} shadowtcb_status;
+
+extern shadowtcb_status shadowtcb_drop_priv (void);
+extern shadowtcb_status shadowtcb_gain_priv (void);
+extern shadowtcb_status shadowtcb_set_user (const char *name);
+extern shadowtcb_status shadowtcb_remove (const char *name);
+extern shadowtcb_status shadowtcb_move (/*@null@*/const char *user_newname,
+                                        uid_t user_newid);
+extern shadowtcb_status shadowtcb_create (const char *name, uid_t uid);
+
+#endif
diff --git a/lib/utent.c b/lib/utent.c
new file mode 100644
index 0000000..d5e6dae
--- /dev/null
+++ b/lib/utent.c
@@ -0,0 +1,70 @@
+/*
+ * SPDX-FileCopyrightText: 1993 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2005       , Tomasz Kłoczko
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ifndef	HAVE_GETUTENT
+
+#include "defines.h"
+#include <stdio.h>
+#include <fcntl.h>
+#include <utmp.h>
+
+#ifndef	lint
+static char rcsid[] = "$Id$";
+#endif
+
+static int utmp_fd = -1;
+static struct utmp utmp_buf;
+
+/*
+ * setutent - open or rewind the utmp file
+ */
+
+void setutent (void)
+{
+	if (utmp_fd == -1)
+		if ((utmp_fd = open (_UTMP_FILE, O_RDWR)) == -1)
+			utmp_fd = open (_UTMP_FILE, O_RDONLY);
+
+	if (utmp_fd != -1)
+		lseek (utmp_fd, (off_t) 0L, SEEK_SET);
+}
+
+/*
+ * endutent - close the utmp file
+ */
+
+void endutent (void)
+{
+	if (utmp_fd != -1)
+		close (utmp_fd);
+
+	utmp_fd = -1;
+}
+
+/*
+ * getutent - get the next record from the utmp file
+ */
+
+struct utmp *getutent (void)
+{
+	if (utmp_fd == -1)
+		setutent ();
+
+	if (utmp_fd == -1)
+		return 0;
+
+	if (read (utmp_fd, &utmp_buf, sizeof utmp_buf) != sizeof utmp_buf)
+		return 0;
+
+	return &utmp_buf;
+}
+#else
+extern int errno;		/* warning: ANSI C forbids an empty source file */
+#endif