Adding upstream version 1:4.13+dfsg1.upstream/1%4.13+dfsg1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

5 files changed, 1228 insertions, 0 deletions

diff --git a/libsubid/Makefile.am b/libsubid/Makefile.am
new file mode 100644
index 0000000..09ec341
--- /dev/null
+++ b/libsubid/Makefile.am
@@ -0,0 +1,30 @@
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+
+pkginclude_HEADERS = subid.h
+
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+	$(LIBAUDIT) \
+	$(LIBSELINUX) \
+	$(LIBSEMANAGE) \
+	$(LIBCRACK) \
+	$(LIBCRYPT_NOPAM) \
+	$(LIBSKEY) \
+	$(LIBMD) \
+	$(LIBECONF) \
+	$(LIBCRYPT) \
+	$(LIBACL) \
+	$(LIBATTR) \
+	$(LIBTCB) \
+	$(LIBPAM)
+
+libsubid_la_LIBADD = \
+	$(top_builddir)/lib/libshadow.la \
+	$(top_builddir)/libmisc/libmisc.la \
+	$(MISCLIBS) -ldl
+
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+	-I${top_srcdir}/lib \
+	-I${top_srcdir}/libmisc \
+	-DLOCALEDIR=\"$(datadir)/locale\"
diff --git a/libsubid/Makefile.in b/libsubid/Makefile.in
new file mode 100644
index 0000000..ed8dc94
--- /dev/null
+++ b/libsubid/Makefile.in
@@ -0,0 +1,764 @@
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+	-test -z "$(lib_LTLIBRARIES)" || rm -f $(lib_LTLIBRARIES)
+	@list='$(lib_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libsubid.la: $(libsubid_la_OBJECTS) $(libsubid_la_DEPENDENCIES) $(EXTRA_libsubid_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(libsubid_la_LINK) -rpath $(libdir) $(libsubid_la_OBJECTS) $(libsubid_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/api.Plo@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.c.o:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ $<
+
+.c.obj:
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+.c.lo:
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+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LTCOMPILE) -c -o $@ $<
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+install-pkgincludeHEADERS: $(pkginclude_HEADERS)
+	@$(NORMAL_INSTALL)
+	@list='$(pkginclude_HEADERS)'; test -n "$(pkgincludedir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(pkgincludedir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(pkgincludedir)" || exit 1; \
+	fi; \
+	for p in $$list; do \
+	  if test -f "$$p"; then d=; else d="$(srcdir)/"; fi; \
+	  echo "$$d$$p"; \
+	done | $(am__base_list) | \
+	while read files; do \
+	  echo " $(INSTALL_HEADER) $$files '$(DESTDIR)$(pkgincludedir)'"; \
+	  $(INSTALL_HEADER) $$files "$(DESTDIR)$(pkgincludedir)" || exit $$?; \
+	done
+
+uninstall-pkgincludeHEADERS:
+	@$(NORMAL_UNINSTALL)
+	@list='$(pkginclude_HEADERS)'; test -n "$(pkgincludedir)" || list=; \
+	files=`for p in $$list; do echo $$p; done | sed -e 's|^.*/||'`; \
+	dir='$(DESTDIR)$(pkgincludedir)'; $(am__uninstall_files_from_dir)
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+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
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+	here=`pwd`; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
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+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
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+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES) $(HEADERS)
+installdirs:
+	for dir in "$(DESTDIR)$(libdir)" "$(DESTDIR)$(pkgincludedir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
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+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
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+installcheck: installcheck-am
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+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libLTLIBRARIES clean-libtool \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/api.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
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+html: html-am
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+html-am:
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+info: info-am
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+install-data-am: install-pkgincludeHEADERS
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+install-dvi: install-dvi-am
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+install-exec-am: install-libLTLIBRARIES
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+install-ps-am:
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+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/api.Plo
+	-rm -f Makefile
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+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
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+pdf: pdf-am
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+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libLTLIBRARIES clean-libtool 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-libLTLIBRARIES install-man install-pdf \
+	install-pdf-am install-pkgincludeHEADERS 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 uninstall-libLTLIBRARIES \
+	uninstall-pkgincludeHEADERS
+
+.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/libsubid/api.c b/libsubid/api.c
new file mode 100644
index 0000000..00da74f
--- /dev/null
+++ b/libsubid/api.c
@@ -0,0 +1,108 @@
+/*
+ * SPDX-FileCopyrightText: 2020 Serge Hallyn
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <pwd.h>
+#include <stdbool.h>
+#include "subordinateio.h"
+#include "idmapping.h"
+#include "subid.h"
+#include "shadowlog.h"
+
+bool subid_init(const char *progname, FILE * logfd)
+{
+	FILE *shadow_logfd;
+	if (progname) {
+		progname = strdup(progname);
+		if (!progname)
+			return false;
+		log_set_progname(progname);
+	} else {
+		log_set_progname("(libsubid)");
+	}
+
+	if (logfd) {
+		log_set_logfd(logfd);
+		return true;
+	}
+	shadow_logfd = fopen("/dev/null", "w");
+	if (!shadow_logfd) {
+		log_set_logfd(stderr);
+		return false;
+	}
+	log_set_logfd(shadow_logfd);
+	return true;
+}
+
+static
+int get_subid_ranges(const char *owner, enum subid_type id_type, struct subid_range **ranges)
+{
+	return list_owner_ranges(owner, id_type, ranges);
+}
+
+int subid_get_uid_ranges(const char *owner, struct subid_range **ranges)
+{
+	return get_subid_ranges(owner, ID_TYPE_UID, ranges);
+}
+
+int subid_get_gid_ranges(const char *owner, struct subid_range **ranges)
+{
+	return get_subid_ranges(owner, ID_TYPE_GID, ranges);
+}
+
+static
+int get_subid_owner(unsigned long id, enum subid_type id_type, uid_t **owner)
+{
+	return find_subid_owners(id, id_type, owner);
+}
+
+int subid_get_uid_owners(uid_t uid, uid_t **owner)
+{
+	return get_subid_owner((unsigned long)uid, ID_TYPE_UID, owner);
+}
+
+int subid_get_gid_owners(gid_t gid, uid_t **owner)
+{
+	return get_subid_owner((unsigned long)gid, ID_TYPE_GID, owner);
+}
+
+static
+bool grant_subid_range(struct subordinate_range *range, bool reuse,
+		       enum subid_type id_type)
+{
+	return new_subid_range(range, id_type, reuse);
+}
+
+bool subid_grant_uid_range(struct subordinate_range *range, bool reuse)
+{
+	return grant_subid_range(range, reuse, ID_TYPE_UID);
+}
+
+bool subid_grant_gid_range(struct subordinate_range *range, bool reuse)
+{
+	return grant_subid_range(range, reuse, ID_TYPE_GID);
+}
+
+static
+bool ungrant_subid_range(struct subordinate_range *range, enum subid_type id_type)
+{
+	return release_subid_range(range, id_type);
+}
+
+bool subid_ungrant_uid_range(struct subordinate_range *range)
+{
+	return ungrant_subid_range(range, ID_TYPE_UID);
+}
+
+bool subid_ungrant_gid_range(struct subordinate_range *range)
+{
+	return ungrant_subid_range(range, ID_TYPE_GID);
+}
diff --git a/libsubid/subid.h b/libsubid/subid.h
new file mode 100644
index 0000000..d13ee84
--- /dev/null
+++ b/libsubid/subid.h
@@ -0,0 +1,163 @@
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdbool.h>
+
+#ifndef SUBID_RANGE_DEFINED
+#define SUBID_RANGE_DEFINED 1
+#define SUBID_ABI_VERSION 4.0.0
+#define SUBID_ABI_MAJOR 4
+#define SUBID_ABI_MINOR 0
+#define SUBID_ABI_MICRO 0
+
+/* subid_range is just a starting point and size of a range */
+struct subid_range {
+	unsigned long start;
+	unsigned long count;
+};
+
+/* subordinage_range is a subid_range plus an owner, representing
+ * a range in /etc/subuid or /etc/subgid */
+struct subordinate_range {
+	const char *owner;
+	unsigned long start;
+	unsigned long count;
+};
+
+enum subid_type {
+	ID_TYPE_UID = 1,
+	ID_TYPE_GID = 2
+};
+
+enum subid_status {
+	SUBID_STATUS_SUCCESS = 0,
+	SUBID_STATUS_UNKNOWN_USER = 1,
+	SUBID_STATUS_ERROR_CONN = 2,
+	SUBID_STATUS_ERROR = 3,
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * subid_init: initialize libsubid
+ *
+ * @progname: Name to display as program.  If NULL, then "(libsubid)" will be
+ *            shown in error messages.
+ * @logfd:    Open file pointer to pass error messages to.  If NULL, then
+ *            /dev/null will be opened and messages will be sent there.  The
+ *            default if libsubid_init() is not called is stderr (2).
+ *
+ * This function does not need to be called.  If not called, then the defaults
+ * will be used.
+ *
+ * Returns false if an error occurred.
+ */
+bool subid_init(const char *progname, FILE *logfd);
+
+/*
+ * subid_get_uid_ranges: return a list of UID ranges for a user
+ *
+ * @owner: username being queried
+ * @ranges: a pointer to an array of subid_range structs in which the result
+ *          will be returned.
+ *
+ * The caller must free(ranges) when done.
+ *
+ * returns: number of ranges found, ir < 0 on error.
+ */
+int subid_get_uid_ranges(const char *owner, struct subid_range **ranges);
+
+/*
+ * subid_get_gid_ranges: return a list of GID ranges for a user
+ *
+ * @owner: username being queried
+ * @ranges: a pointer to an array of subid_range structs in which the result
+ *          will be returned.
+ *
+ * The caller must free(ranges) when done.
+ *
+ * returns: number of ranges found, ir < 0 on error.
+ */
+int subid_get_gid_ranges(const char *owner, struct subid_range **ranges);
+
+/*
+ * subid_get_uid_owners: return a list of uids to which the given uid has been
+ *                    delegated.
+ *
+ * @uid: The subuid being queried
+ * @owners: a pointer to an array of uids into which the results are placed.
+ *          The returned array must be freed by the caller.
+ *
+ * Returns the number of uids returned, or < 0 on error.
+ */
+int subid_get_uid_owners(uid_t uid, uid_t **owner);
+
+/*
+ * subid_get_gid_owners: return a list of uids to which the given gid has been
+ *                    delegated.
+ *
+ * @uid: The subgid being queried
+ * @owners: a pointer to an array of uids into which the results are placed.
+ *          The returned array must be freed by the caller.
+ *
+ * Returns the number of uids returned, or < 0 on error.
+ */
+int subid_get_gid_owners(gid_t gid, uid_t **owner);
+
+/*
+ * subid_grant_uid_range: assign a subuid range to a user
+ *
+ * @range: pointer to a struct subordinate_range detailing the UID range
+ *         to allocate.  ->owner must be the username, and ->count must be
+ *         filled in.  ->start is ignored, and will contain the start
+ *         of the newly allocated range, upon success.
+ *
+ * Returns true if the delegation succeeded, false otherwise.  If true,
+ * then the range from (range->start, range->start + range->count) will
+ * be delegated to range->owner.
+ */
+bool subid_grant_uid_range(struct subordinate_range *range, bool reuse);
+
+/*
+ * subid_grant_gid_range: assign a subgid range to a user
+ *
+ * @range: pointer to a struct subordinate_range detailing the GID range
+ *         to allocate.  ->owner must be the username, and ->count must be
+ *         filled in.  ->start is ignored, and will contain the start
+ *         of the newly allocated range, upon success.
+ *
+ * Returns true if the delegation succeeded, false otherwise.  If true,
+ * then the range from (range->start, range->start + range->count) will
+ * be delegated to range->owner.
+ */
+bool subid_grant_gid_range(struct subordinate_range *range, bool reuse);
+
+/*
+ * subid_ungrant_uid_range: remove a subuid allocation.
+ *
+ * @range: pointer to a struct subordinate_range detailing the UID allocation
+ *         to remove.
+ *
+ * Returns true if successful, false if it failed, for instance if the
+ * delegation did not exist.
+ */
+bool subid_ungrant_uid_range(struct subordinate_range *range);
+
+/*
+ * subid_ungrant_gid_range: remove a subgid allocation.
+ *
+ * @range: pointer to a struct subordinate_range detailing the GID allocation
+ *         to remove.
+ *
+ * Returns true if successful, false if it failed, for instance if the
+ * delegation did not exist.
+ */
+bool subid_ungrant_gid_range(struct subordinate_range *range);
+
+#ifdef __cplusplus
+}
+#endif
+
+#define SUBID_NFIELDS 3
+#endif
diff --git a/libsubid/subid.h.in b/libsubid/subid.h.in
new file mode 100644
index 0000000..79744ed
--- /dev/null
+++ b/libsubid/subid.h.in
@@ -0,0 +1,163 @@
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdbool.h>
+
+#ifndef SUBID_RANGE_DEFINED
+#define SUBID_RANGE_DEFINED 1
+#define SUBID_ABI_VERSION @LIBSUBID_ABI_MAJOR@.@LIBSUBID_ABI_MINOR@.@LIBSUBID_ABI_MICRO@
+#define SUBID_ABI_MAJOR @LIBSUBID_ABI_MAJOR@
+#define SUBID_ABI_MINOR @LIBSUBID_ABI_MINOR@
+#define SUBID_ABI_MICRO @LIBSUBID_ABI_MICRO@
+
+/* subid_range is just a starting point and size of a range */
+struct subid_range {
+	unsigned long start;
+	unsigned long count;
+};
+
+/* subordinage_range is a subid_range plus an owner, representing
+ * a range in /etc/subuid or /etc/subgid */
+struct subordinate_range {
+	const char *owner;
+	unsigned long start;
+	unsigned long count;
+};
+
+enum subid_type {
+	ID_TYPE_UID = 1,
+	ID_TYPE_GID = 2
+};
+
+enum subid_status {
+	SUBID_STATUS_SUCCESS = 0,
+	SUBID_STATUS_UNKNOWN_USER = 1,
+	SUBID_STATUS_ERROR_CONN = 2,
+	SUBID_STATUS_ERROR = 3,
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * subid_init: initialize libsubid
+ *
+ * @progname: Name to display as program.  If NULL, then "(libsubid)" will be
+ *            shown in error messages.
+ * @logfd:    Open file pointer to pass error messages to.  If NULL, then
+ *            /dev/null will be opened and messages will be sent there.  The
+ *            default if libsubid_init() is not called is stderr (2).
+ *
+ * This function does not need to be called.  If not called, then the defaults
+ * will be used.
+ *
+ * Returns false if an error occurred.
+ */
+bool subid_init(const char *progname, FILE *logfd);
+
+/*
+ * subid_get_uid_ranges: return a list of UID ranges for a user
+ *
+ * @owner: username being queried
+ * @ranges: a pointer to an array of subid_range structs in which the result
+ *          will be returned.
+ *
+ * The caller must free(ranges) when done.
+ *
+ * returns: number of ranges found, ir < 0 on error.
+ */
+int subid_get_uid_ranges(const char *owner, struct subid_range **ranges);
+
+/*
+ * subid_get_gid_ranges: return a list of GID ranges for a user
+ *
+ * @owner: username being queried
+ * @ranges: a pointer to an array of subid_range structs in which the result
+ *          will be returned.
+ *
+ * The caller must free(ranges) when done.
+ *
+ * returns: number of ranges found, ir < 0 on error.
+ */
+int subid_get_gid_ranges(const char *owner, struct subid_range **ranges);
+
+/*
+ * subid_get_uid_owners: return a list of uids to which the given uid has been
+ *                    delegated.
+ *
+ * @uid: The subuid being queried
+ * @owners: a pointer to an array of uids into which the results are placed.
+ *          The returned array must be freed by the caller.
+ *
+ * Returns the number of uids returned, or < 0 on error.
+ */
+int subid_get_uid_owners(uid_t uid, uid_t **owner);
+
+/*
+ * subid_get_gid_owners: return a list of uids to which the given gid has been
+ *                    delegated.
+ *
+ * @uid: The subgid being queried
+ * @owners: a pointer to an array of uids into which the results are placed.
+ *          The returned array must be freed by the caller.
+ *
+ * Returns the number of uids returned, or < 0 on error.
+ */
+int subid_get_gid_owners(gid_t gid, uid_t **owner);
+
+/*
+ * subid_grant_uid_range: assign a subuid range to a user
+ *
+ * @range: pointer to a struct subordinate_range detailing the UID range
+ *         to allocate.  ->owner must be the username, and ->count must be
+ *         filled in.  ->start is ignored, and will contain the start
+ *         of the newly allocated range, upon success.
+ *
+ * Returns true if the delegation succeeded, false otherwise.  If true,
+ * then the range from (range->start, range->start + range->count) will
+ * be delegated to range->owner.
+ */
+bool subid_grant_uid_range(struct subordinate_range *range, bool reuse);
+
+/*
+ * subid_grant_gid_range: assign a subgid range to a user
+ *
+ * @range: pointer to a struct subordinate_range detailing the GID range
+ *         to allocate.  ->owner must be the username, and ->count must be
+ *         filled in.  ->start is ignored, and will contain the start
+ *         of the newly allocated range, upon success.
+ *
+ * Returns true if the delegation succeeded, false otherwise.  If true,
+ * then the range from (range->start, range->start + range->count) will
+ * be delegated to range->owner.
+ */
+bool subid_grant_gid_range(struct subordinate_range *range, bool reuse);
+
+/*
+ * subid_ungrant_uid_range: remove a subuid allocation.
+ *
+ * @range: pointer to a struct subordinate_range detailing the UID allocation
+ *         to remove.
+ *
+ * Returns true if successful, false if it failed, for instance if the
+ * delegation did not exist.
+ */
+bool subid_ungrant_uid_range(struct subordinate_range *range);
+
+/*
+ * subid_ungrant_gid_range: remove a subgid allocation.
+ *
+ * @range: pointer to a struct subordinate_range detailing the GID allocation
+ *         to remove.
+ *
+ * Returns true if successful, false if it failed, for instance if the
+ * delegation did not exist.
+ */
+bool subid_ungrant_gid_range(struct subordinate_range *range);
+
+#ifdef __cplusplus
+}
+#endif
+
+#define SUBID_NFIELDS 3
+#endif