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-rw-r--r--libmisc/addgrps.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/libmisc/addgrps.c b/libmisc/addgrps.c
new file mode 100644
index 0000000..845d383
--- /dev/null
+++ b/libmisc/addgrps.c
@@ -0,0 +1,114 @@
+/*
+ * SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2009, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#if defined (HAVE_SETGROUPS) && ! defined (USE_PAM)
+
+#include "prototypes.h"
+#include "defines.h"
+
+#include <stdio.h>
+#include <grp.h>
+#include <errno.h>
+#include "shadowlog.h"
+
+#ident "$Id$"
+
+#define SEP ",:"
+/*
+ * Add groups with names from LIST (separated by commas or colons)
+ * to the supplementary group set. Silently ignore groups which are
+ * already there. Warning: uses strtok().
+ */
+int add_groups (const char *list)
+{
+ GETGROUPS_T *grouplist, *tmp;
+ size_t i;
+ int ngroups;
+ bool added;
+ char *token;
+ char buf[1024];
+ int ret;
+ FILE *shadow_logfd = log_get_logfd();
+
+ if (strlen (list) >= sizeof (buf)) {
+ errno = EINVAL;
+ return -1;
+ }
+ strcpy (buf, list);
+
+ i = 16;
+ for (;;) {
+ grouplist = (gid_t *) malloc (i * sizeof (GETGROUPS_T));
+ if (NULL == grouplist) {
+ return -1;
+ }
+ ngroups = getgroups (i, grouplist);
+ if ( ( (-1 == ngroups)
+ && (EINVAL != errno))
+ || (i > (size_t)ngroups)) {
+ /* Unexpected failure of getgroups or successful
+ * reception of the groups */
+ break;
+ }
+ /* not enough room, so try allocating a larger buffer */
+ free (grouplist);
+ i *= 2;
+ }
+ if (ngroups < 0) {
+ free (grouplist);
+ return -1;
+ }
+
+ added = false;
+ for (token = strtok (buf, SEP); NULL != token; token = strtok (NULL, SEP)) {
+ struct group *grp;
+
+ grp = getgrnam (token); /* local, no need for xgetgrnam */
+ if (NULL == grp) {
+ fprintf (shadow_logfd, _("Warning: unknown group %s\n"),
+ token);
+ continue;
+ }
+
+ for (i = 0; i < (size_t)ngroups && grouplist[i] != grp->gr_gid; i++);
+
+ if (i < (size_t)ngroups) {
+ continue;
+ }
+
+ if (ngroups >= sysconf (_SC_NGROUPS_MAX)) {
+ fputs (_("Warning: too many groups\n"), shadow_logfd);
+ break;
+ }
+ tmp = (gid_t *) realloc (grouplist, (size_t)(ngroups + 1) * sizeof (GETGROUPS_T));
+ if (NULL == tmp) {
+ free (grouplist);
+ return -1;
+ }
+ tmp[ngroups] = grp->gr_gid;
+ ngroups++;
+ grouplist = tmp;
+ added = true;
+ }
+
+ if (added) {
+ ret = setgroups ((size_t)ngroups, grouplist);
+ free (grouplist);
+ return ret;
+ }
+
+ free (grouplist);
+ return 0;
+}
+#else /* HAVE_SETGROUPS && !USE_PAM */
+extern int errno; /* warning: ANSI C forbids an empty source file */
+#endif /* HAVE_SETGROUPS && !USE_PAM */
+