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-rw-r--r--src/pwconv.c316
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diff --git a/src/pwconv.c b/src/pwconv.c
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+/*
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2002 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2009 - 2012, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * pwconv - create or update /etc/shadow with information from
+ * /etc/passwd.
+ *
+ * It is more like SysV pwconv, slightly different from the original Shadow
+ * pwconv. Depends on "x" as password in /etc/passwd which means that the
+ * password has already been moved to /etc/shadow. There is no need to move
+ * /etc/npasswd to /etc/passwd, password files are updated using library
+ * routines with proper locking.
+ *
+ * Can be used to update /etc/shadow after adding/deleting users by editing
+ * /etc/passwd. There is no man page yet, but this program should be close
+ * to pwconv(1M) on Solaris 2.x.
+ *
+ * Warning: make sure that all users have "x" as the password in /etc/passwd
+ * before running this program for the first time on a system which already
+ * has shadow passwords. Anything else (like "*" from old versions of the
+ * shadow suite) will replace the user's encrypted password in /etc/shadow.
+ *
+ * Doesn't currently support pw_age information in /etc/passwd, and doesn't
+ * support DBM files. Add it if you need it...
+ *
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <getopt.h>
+#include "defines.h"
+#include "getdef.h"
+#include "prototypes.h"
+#include "pwio.h"
+#include "shadowio.h"
+#include "nscd.h"
+#include "sssd.h"
+#include "shadowlog.h"
+
+/*
+ * exit status values
+ */
+/*@-exitarg@*/
+#define E_SUCCESS 0 /* success */
+#define E_NOPERM 1 /* permission denied */
+#define E_USAGE 2 /* invalid command syntax */
+#define E_FAILURE 3 /* unexpected failure, nothing done */
+#define E_MISSING 4 /* unexpected failure, passwd file missing */
+#define E_PWDBUSY 5 /* passwd file(s) busy */
+#define E_BADENTRY 6 /* bad shadow entry */
+/*
+ * Global variables
+ */
+const char *Prog;
+
+static bool spw_locked = false;
+static bool pw_locked = false;
+
+/* local function prototypes */
+static void fail_exit (int status);
+static void usage (int status);
+static void process_flags (int argc, char **argv);
+
+static void fail_exit (int status)
+{
+ if (pw_locked) {
+ if (pw_unlock () == 0) {
+ fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, pw_dbname ());
+ SYSLOG ((LOG_ERR, "failed to unlock %s", pw_dbname ()));
+ /* continue */
+ }
+ }
+
+ if (spw_locked) {
+ if (spw_unlock () == 0) {
+ fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ());
+ SYSLOG ((LOG_ERR, "failed to unlock %s", spw_dbname ()));
+ /* continue */
+ }
+ }
+
+ exit (status);
+}
+
+static void usage (int status)
+{
+ FILE *usageout = (E_SUCCESS != status) ? stderr : stdout;
+ (void) fprintf (usageout,
+ _("Usage: %s [options]\n"
+ "\n"
+ "Options:\n"),
+ Prog);
+ (void) fputs (_(" -h, --help display this help message and exit\n"), usageout);
+ (void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout);
+ (void) fputs ("\n", usageout);
+ exit (status);
+}
+
+/*
+ * process_flags - parse the command line options
+ *
+ * It will not return if an error is encountered.
+ */
+static void process_flags (int argc, char **argv)
+{
+ /*
+ * Parse the command line options.
+ */
+ int c;
+ static struct option long_options[] = {
+ {"help", no_argument, NULL, 'h'},
+ {"root", required_argument, NULL, 'R'},
+ {NULL, 0, NULL, '\0'}
+ };
+
+ while ((c = getopt_long (argc, argv, "hR:",
+ long_options, NULL)) != -1) {
+ switch (c) {
+ case 'h':
+ usage (E_SUCCESS);
+ /*@notreached@*/break;
+ case 'R': /* no-op, handled in process_root_flag () */
+ break;
+ default:
+ usage (E_USAGE);
+ }
+ }
+
+ if (optind != argc) {
+ usage (E_USAGE);
+ }
+}
+
+int main (int argc, char **argv)
+{
+ const struct passwd *pw;
+ struct passwd pwent;
+ const struct spwd *sp;
+ struct spwd spent;
+
+ Prog = Basename (argv[0]);
+ log_set_progname(Prog);
+ log_set_logfd(stderr);
+
+ (void) setlocale (LC_ALL, "");
+ (void) bindtextdomain (PACKAGE, LOCALEDIR);
+ (void) textdomain (PACKAGE);
+
+ process_root_flag ("-R", argc, argv);
+
+ OPENLOG ("pwconv");
+
+ process_flags (argc, argv);
+
+#ifdef WITH_TCB
+ if (getdef_bool("USE_TCB")) {
+ fprintf (stderr, _("%s: can't work with tcb enabled\n"), Prog);
+ exit (E_FAILURE);
+ }
+#endif /* WITH_TCB */
+
+ if (pw_lock () == 0) {
+ fprintf (stderr,
+ _("%s: cannot lock %s; try again later.\n"),
+ Prog, pw_dbname ());
+ fail_exit (E_PWDBUSY);
+ }
+ pw_locked = true;
+ if (pw_open (O_CREAT | O_RDWR) == 0) {
+ fprintf (stderr,
+ _("%s: cannot open %s\n"), Prog, pw_dbname ());
+ fail_exit (E_MISSING);
+ }
+
+ if (spw_lock () == 0) {
+ fprintf (stderr,
+ _("%s: cannot lock %s; try again later.\n"),
+ Prog, spw_dbname ());
+ fail_exit (E_PWDBUSY);
+ }
+ spw_locked = true;
+ if (spw_open (O_CREAT | O_RDWR) == 0) {
+ fprintf (stderr,
+ _("%s: cannot open %s\n"), Prog, spw_dbname ());
+ fail_exit (E_FAILURE);
+ }
+
+ /*
+ * Remove /etc/shadow entries for users not in /etc/passwd.
+ */
+ (void) spw_rewind ();
+ while ((sp = spw_next ()) != NULL) {
+ if (pw_locate (sp->sp_namp) != NULL) {
+ continue;
+ }
+
+ if (spw_remove (sp->sp_namp) == 0) {
+ /*
+ * This shouldn't happen (the entry exists) but...
+ */
+ fprintf (stderr,
+ _("%s: cannot remove entry '%s' from %s\n"),
+ Prog, sp->sp_namp, spw_dbname ());
+ fail_exit (E_FAILURE);
+ }
+ (void) spw_rewind();
+ }
+
+ /*
+ * Update shadow entries which don't have "x" as pw_passwd. Add any
+ * missing shadow entries.
+ */
+ (void) pw_rewind ();
+ while ((pw = pw_next ()) != NULL) {
+ sp = spw_locate (pw->pw_name);
+ if (NULL != sp) {
+ /* do we need to update this entry? */
+ if (strcmp (pw->pw_passwd, SHADOW_PASSWD_STRING) == 0) {
+ continue;
+ }
+ /* update existing shadow entry */
+ spent = *sp;
+ } else {
+ /* add new shadow entry */
+ memset (&spent, 0, sizeof spent);
+ spent.sp_namp = pw->pw_name;
+ spent.sp_min = getdef_num ("PASS_MIN_DAYS", -1);
+ spent.sp_max = getdef_num ("PASS_MAX_DAYS", -1);
+ spent.sp_warn = getdef_num ("PASS_WARN_AGE", -1);
+ spent.sp_inact = -1;
+ spent.sp_expire = -1;
+ spent.sp_flag = SHADOW_SP_FLAG_UNSET;
+ }
+ spent.sp_pwdp = pw->pw_passwd;
+ spent.sp_lstchg = (long) gettime () / SCALE;
+ if (0 == spent.sp_lstchg) {
+ /* Better disable aging than requiring a password
+ * change */
+ spent.sp_lstchg = -1;
+ }
+ if (spw_update (&spent) == 0) {
+ fprintf (stderr,
+ _("%s: failed to prepare the new %s entry '%s'\n"),
+ Prog, spw_dbname (), spent.sp_namp);
+ fail_exit (E_FAILURE);
+ }
+
+ /* remove password from /etc/passwd */
+ pwent = *pw;
+ pwent.pw_passwd = SHADOW_PASSWD_STRING; /* XXX warning: const */
+ if (pw_update (&pwent) == 0) {
+ fprintf (stderr,
+ _("%s: failed to prepare the new %s entry '%s'\n"),
+ Prog, pw_dbname (), pwent.pw_name);
+ fail_exit (E_FAILURE);
+ }
+ }
+
+ if (spw_close () == 0) {
+ fprintf (stderr,
+ _("%s: failure while writing changes to %s\n"),
+ Prog, spw_dbname ());
+ SYSLOG ((LOG_ERR, "failure while writing changes to %s", spw_dbname ()));
+ fail_exit (E_FAILURE);
+ }
+ if (pw_close () == 0) {
+ fprintf (stderr,
+ _("%s: failure while writing changes to %s\n"),
+ Prog, pw_dbname ());
+ SYSLOG ((LOG_ERR, "failure while writing changes to %s", pw_dbname ()));
+ fail_exit (E_FAILURE);
+ }
+
+ /* /etc/passwd- (backup file) */
+ errno = 0;
+ if ((chmod (PASSWD_FILE "-", 0600) != 0) && (errno != ENOENT)) {
+ fprintf (stderr,
+ _("%s: failed to change the mode of %s to 0600\n"),
+ Prog, PASSWD_FILE "-");
+ SYSLOG ((LOG_ERR, "failed to change the mode of %s to 0600", PASSWD_FILE "-"));
+ /* continue */
+ }
+
+ if (pw_unlock () == 0) {
+ fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, pw_dbname ());
+ SYSLOG ((LOG_ERR, "failed to unlock %s", pw_dbname ()));
+ /* continue */
+ }
+
+ if (spw_unlock () == 0) {
+ fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ());
+ SYSLOG ((LOG_ERR, "failed to unlock %s", spw_dbname ()));
+ /* continue */
+ }
+
+ nscd_flush_cache ("passwd");
+ sssd_flush_cache (SSSD_DB_PASSWD);
+
+ return E_SUCCESS;
+}
+
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