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-rw-r--r--src/groupadd.c632
1 files changed, 632 insertions, 0 deletions
diff --git a/src/groupadd.c b/src/groupadd.c
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index 0000000..66ccb53
--- /dev/null
+++ b/src/groupadd.c
@@ -0,0 +1,632 @@
+/*
+ * SPDX-FileCopyrightText: 1991 - 1993, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2000 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2011, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <ctype.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <grp.h>
+#include <stdio.h>
+#include <sys/types.h>
+#ifdef ACCT_TOOLS_SETUID
+#ifdef USE_PAM
+#include "pam_defs.h"
+#include <pwd.h>
+#endif /* USE_PAM */
+#endif /* ACCT_TOOLS_SETUID */
+#include "chkname.h"
+#include "defines.h"
+#include "getdef.h"
+#include "groupio.h"
+#include "nscd.h"
+#include "sssd.h"
+#include "prototypes.h"
+#ifdef SHADOWGRP
+#include "sgroupio.h"
+#endif
+#include "shadowlog.h"
+
+/*
+ * exit status values
+ */
+/*@-exitarg@*/
+#define E_SUCCESS 0 /* success */
+#define E_USAGE 2 /* invalid command syntax */
+#define E_BAD_ARG 3 /* invalid argument to option */
+#define E_GID_IN_USE 4 /* gid not unique (when -o not used) */
+#define E_NAME_IN_USE 9 /* group name not unique */
+#define E_GRP_UPDATE 10 /* can't update group file */
+
+/*
+ * Global variables
+ */
+const char *Prog;
+
+static /*@null@*/char *group_name;
+static gid_t group_id;
+static /*@null@*/char *group_passwd;
+static /*@null@*/char *empty_list = NULL;
+
+static const char *prefix = "";
+static char *user_list;
+
+static bool oflg = false; /* permit non-unique group ID to be specified with -g */
+static bool gflg = false; /* ID value for the new group */
+static bool fflg = false; /* if group already exists, do nothing and exit(0) */
+static bool rflg = false; /* create a system account */
+static bool pflg = false; /* new encrypted password */
+
+#ifdef SHADOWGRP
+static bool is_shadow_grp;
+#endif
+
+/* local function prototypes */
+static /*@noreturn@*/void usage (int status);
+static void new_grent (struct group *grent);
+
+#ifdef SHADOWGRP
+static void new_sgent (struct sgrp *sgent);
+#endif
+static void grp_update (void);
+static void check_new_name (void);
+static void close_files (void);
+static void open_files (void);
+static void process_flags (int argc, char **argv);
+static void check_flags (void);
+static void check_perms (void);
+
+/*
+ * usage - display usage message and exit
+ */
+static /*@noreturn@*/void usage (int status)
+{
+ FILE *usageout = (E_SUCCESS != status) ? stderr : stdout;
+ (void) fprintf (usageout,
+ _("Usage: %s [options] GROUP\n"
+ "\n"
+ "Options:\n"),
+ Prog);
+ (void) fputs (_(" -f, --force exit successfully if the group already exists,\n"
+ " and cancel -g if the GID is already used\n"), usageout);
+ (void) fputs (_(" -g, --gid GID use GID for the new group\n"), usageout);
+ (void) fputs (_(" -h, --help display this help message and exit\n"), usageout);
+ (void) fputs (_(" -K, --key KEY=VALUE override /etc/login.defs defaults\n"), usageout);
+ (void) fputs (_(" -o, --non-unique allow to create groups with duplicate\n"
+ " (non-unique) GID\n"), usageout);
+ (void) fputs (_(" -p, --password PASSWORD use this encrypted password for the new group\n"), usageout);
+ (void) fputs (_(" -r, --system create a system account\n"), usageout);
+ (void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout);
+ (void) fputs (_(" -P, --prefix PREFIX_DI directory prefix\n"), usageout);
+ (void) fputs (_(" -U, --users USERS list of user members of this group\n"), usageout);
+ (void) fputs ("\n", usageout);
+ exit (status);
+}
+
+/*
+ * new_grent - initialize the values in a group file entry
+ *
+ * new_grent() takes all of the values that have been entered and fills
+ * in a (struct group) with them.
+ */
+static void new_grent (struct group *grent)
+{
+ memzero (grent, sizeof *grent);
+ grent->gr_name = group_name;
+ if (pflg) {
+ grent->gr_passwd = group_passwd;
+ } else {
+ grent->gr_passwd = SHADOW_PASSWD_STRING; /* XXX warning: const */
+ }
+ grent->gr_gid = group_id;
+ grent->gr_mem = &empty_list;
+}
+
+#ifdef SHADOWGRP
+/*
+ * new_sgent - initialize the values in a shadow group file entry
+ *
+ * new_sgent() takes all of the values that have been entered and fills
+ * in a (struct sgrp) with them.
+ */
+static void new_sgent (struct sgrp *sgent)
+{
+ memzero (sgent, sizeof *sgent);
+ sgent->sg_name = group_name;
+ if (pflg) {
+ sgent->sg_passwd = group_passwd;
+ } else {
+ sgent->sg_passwd = "!"; /* XXX warning: const */
+ }
+ sgent->sg_adm = &empty_list;
+ sgent->sg_mem = &empty_list;
+}
+#endif /* SHADOWGRP */
+
+/*
+ * grp_update - add new group file entries
+ *
+ * grp_update() writes the new records to the group files.
+ */
+static void grp_update (void)
+{
+ struct group grp;
+
+#ifdef SHADOWGRP
+ struct sgrp sgrp;
+#endif /* SHADOWGRP */
+
+ /*
+ * To add the group, we need to update /etc/group.
+ * Make sure failures will be reported.
+ */
+ add_cleanup (cleanup_report_add_group_group, group_name);
+#ifdef SHADOWGRP
+ if (is_shadow_grp) {
+ /* We also need to update /etc/gshadow */
+ add_cleanup (cleanup_report_add_group_gshadow, group_name);
+ }
+#endif
+
+ /*
+ * Create the initial entries for this new group.
+ */
+ new_grent (&grp);
+#ifdef SHADOWGRP
+ new_sgent (&sgrp);
+ if (is_shadow_grp && pflg) {
+ grp.gr_passwd = SHADOW_PASSWD_STRING; /* XXX warning: const */
+ }
+#endif /* SHADOWGRP */
+
+ if (user_list) {
+ char *token;
+ token = strtok(user_list, ",");
+ while (token) {
+ if (prefix_getpwnam (token) == NULL) {
+ fprintf (stderr, _("Invalid member username %s\n"), token);
+ exit (E_GRP_UPDATE);
+ }
+ grp.gr_mem = add_list(grp.gr_mem, token);
+ token = strtok(NULL, ",");
+ }
+ }
+
+ /*
+ * Write out the new group file entry.
+ */
+ if (gr_update (&grp) == 0) {
+ fprintf (stderr,
+ _("%s: failed to prepare the new %s entry '%s'\n"),
+ Prog, gr_dbname (), grp.gr_name);
+ exit (E_GRP_UPDATE);
+ }
+#ifdef SHADOWGRP
+ /*
+ * Write out the new shadow group entries as well.
+ */
+ if (is_shadow_grp && (sgr_update (&sgrp) == 0)) {
+ fprintf (stderr,
+ _("%s: failed to prepare the new %s entry '%s'\n"),
+ Prog, sgr_dbname (), sgrp.sg_name);
+ exit (E_GRP_UPDATE);
+ }
+#endif /* SHADOWGRP */
+}
+
+/*
+ * check_new_name - check the new name for validity
+ *
+ * check_new_name() insures that the new name doesn't contain any
+ * illegal characters.
+ */
+static void check_new_name (void)
+{
+ if (is_valid_group_name (group_name)) {
+ return;
+ }
+
+ /*
+ * All invalid group names land here.
+ */
+
+ fprintf (stderr, _("%s: '%s' is not a valid group name\n"),
+ Prog, group_name);
+
+ exit (E_BAD_ARG);
+}
+
+/*
+ * close_files - close all of the files that were opened
+ *
+ * close_files() closes all of the files that were opened for this new
+ * group. This causes any modified entries to be written out.
+ */
+static void close_files (void)
+{
+ /* First, write the changes in the regular group database */
+ if (gr_close () == 0) {
+ fprintf (stderr,
+ _("%s: failure while writing changes to %s\n"),
+ Prog, gr_dbname ());
+ exit (E_GRP_UPDATE);
+ }
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_ADD_GROUP, Prog,
+ "adding group to /etc/group",
+ group_name, (unsigned int) group_id,
+ SHADOW_AUDIT_SUCCESS);
+#endif
+ SYSLOG ((LOG_INFO, "group added to %s: name=%s, GID=%u",
+ gr_dbname (), group_name, (unsigned int) group_id));
+ del_cleanup (cleanup_report_add_group_group);
+
+ cleanup_unlock_group (NULL);
+ del_cleanup (cleanup_unlock_group);
+
+ /* Now, write the changes in the shadow database */
+#ifdef SHADOWGRP
+ if (is_shadow_grp) {
+ if (sgr_close () == 0) {
+ fprintf (stderr,
+ _("%s: failure while writing changes to %s\n"),
+ Prog, sgr_dbname ());
+ exit (E_GRP_UPDATE);
+ }
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_ADD_GROUP, Prog,
+ "adding group to /etc/gshadow",
+ group_name, (unsigned int) group_id,
+ SHADOW_AUDIT_SUCCESS);
+#endif
+ SYSLOG ((LOG_INFO, "group added to %s: name=%s",
+ sgr_dbname (), group_name));
+ del_cleanup (cleanup_report_add_group_gshadow);
+
+ cleanup_unlock_gshadow (NULL);
+ del_cleanup (cleanup_unlock_gshadow);
+ }
+#endif /* SHADOWGRP */
+
+ /* Report success at the system level */
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_ADD_GROUP, Prog,
+ "",
+ group_name, (unsigned int) group_id,
+ SHADOW_AUDIT_SUCCESS);
+#endif
+ SYSLOG ((LOG_INFO, "new group: name=%s, GID=%u",
+ group_name, (unsigned int) group_id));
+ del_cleanup (cleanup_report_add_group);
+}
+
+/*
+ * open_files - lock and open the group files
+ *
+ * open_files() opens the two group files.
+ */
+static void open_files (void)
+{
+ /* First, lock the databases */
+ if (gr_lock () == 0) {
+ fprintf (stderr,
+ _("%s: cannot lock %s; try again later.\n"),
+ Prog, gr_dbname ());
+ exit (E_GRP_UPDATE);
+ }
+ add_cleanup (cleanup_unlock_group, NULL);
+
+#ifdef SHADOWGRP
+ if (is_shadow_grp) {
+ if (sgr_lock () == 0) {
+ fprintf (stderr,
+ _("%s: cannot lock %s; try again later.\n"),
+ Prog, sgr_dbname ());
+ exit (E_GRP_UPDATE);
+ }
+ add_cleanup (cleanup_unlock_gshadow, NULL);
+ }
+#endif /* SHADOWGRP */
+
+ /*
+ * Now if the group is not added, it's our fault.
+ * Make sure failures will be reported.
+ */
+ add_cleanup (cleanup_report_add_group, group_name);
+
+ /* And now open the databases */
+ if (gr_open (O_CREAT | O_RDWR) == 0) {
+ fprintf (stderr, _("%s: cannot open %s\n"), Prog, gr_dbname ());
+ SYSLOG ((LOG_WARN, "cannot open %s", gr_dbname ()));
+ exit (E_GRP_UPDATE);
+ }
+
+#ifdef SHADOWGRP
+ if (is_shadow_grp) {
+ if (sgr_open (O_CREAT | O_RDWR) == 0) {
+ fprintf (stderr,
+ _("%s: cannot open %s\n"),
+ Prog, sgr_dbname ());
+ SYSLOG ((LOG_WARN, "cannot open %s", sgr_dbname ()));
+ exit (E_GRP_UPDATE);
+ }
+ }
+#endif /* SHADOWGRP */
+}
+
+/*
+ * 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.
+ */
+ char *cp;
+ int c;
+ static struct option long_options[] = {
+ {"force", no_argument, NULL, 'f'},
+ {"gid", required_argument, NULL, 'g'},
+ {"help", no_argument, NULL, 'h'},
+ {"key", required_argument, NULL, 'K'},
+ {"non-unique", no_argument, NULL, 'o'},
+ {"password", required_argument, NULL, 'p'},
+ {"system", no_argument, NULL, 'r'},
+ {"root", required_argument, NULL, 'R'},
+ {"prefix", required_argument, NULL, 'P'},
+ {"users", required_argument, NULL, 'U'},
+ {NULL, 0, NULL, '\0'}
+ };
+
+ while ((c = getopt_long (argc, argv, "fg:hK:op:rR:P:U:",
+ long_options, NULL)) != -1) {
+ switch (c) {
+ case 'f':
+ /*
+ * "force" - do nothing, just exit(0), if the
+ * specified group already exists. With -g, if
+ * specified gid already exists, choose another
+ * (unique) gid (turn off -g). Based on the RedHat's
+ * patch from shadow-utils-970616-9.
+ */
+ fflg = true;
+ break;
+ case 'g':
+ gflg = true;
+ if ( (get_gid (optarg, &group_id) == 0)
+ || (group_id == (gid_t)-1)) {
+ fprintf (stderr,
+ _("%s: invalid group ID '%s'\n"),
+ Prog, optarg);
+ exit (E_BAD_ARG);
+ }
+ break;
+ case 'h':
+ usage (E_SUCCESS);
+ /*@notreached@*/break;
+ case 'K':
+ /*
+ * override login.defs defaults (-K name=value)
+ * example: -K GID_MIN=100 -K GID_MAX=499
+ * note: -K GID_MIN=10,GID_MAX=499 doesn't work yet
+ */
+ cp = strchr (optarg, '=');
+ if (NULL == cp) {
+ fprintf (stderr,
+ _("%s: -K requires KEY=VALUE\n"),
+ Prog);
+ exit (E_BAD_ARG);
+ }
+ /* terminate name, point to value */
+ *cp++ = '\0';
+ if (putdef_str (optarg, cp) < 0) {
+ exit (E_BAD_ARG);
+ }
+ break;
+ case 'o':
+ oflg = true;
+ break;
+ case 'p':
+ pflg = true;
+ group_passwd = optarg;
+ break;
+ case 'r':
+ rflg = true;
+ break;
+ case 'R': /* no-op, handled in process_root_flag () */
+ break;
+ case 'P': /* no-op, handled in process_prefix_flag () */
+ break;
+ case 'U':
+ user_list = optarg;
+ break;
+ default:
+ usage (E_USAGE);
+ }
+ }
+
+ /*
+ * Check the flags consistency
+ */
+ if (optind != argc - 1) {
+ usage (E_USAGE);
+ }
+ group_name = argv[optind];
+
+ check_flags ();
+}
+
+/*
+ * check_flags - check flags and parameters consistency
+ *
+ * It will not return if an error is encountered.
+ */
+static void check_flags (void)
+{
+ /* -o does not make sense without -g */
+ if (oflg && !gflg) {
+ usage (E_USAGE);
+ }
+
+ check_new_name ();
+
+ /*
+ * Check if the group already exist.
+ */
+ /* local, no need for xgetgrnam */
+ if (prefix_getgrnam (group_name) != NULL) {
+ /* The group already exist */
+ if (fflg) {
+ /* OK, no need to do anything */
+ exit (E_SUCCESS);
+ }
+ fprintf (stderr,
+ _("%s: group '%s' already exists\n"),
+ Prog, group_name);
+ exit (E_NAME_IN_USE);
+ }
+
+ if (gflg && (prefix_getgrgid (group_id) != NULL)) {
+ /* A GID was specified, and a group already exist with that GID
+ * - either we will use this GID anyway (-o)
+ * - either we ignore the specified GID and
+ * we will use another one (-f)
+ * - either it is a failure
+ */
+ if (oflg) {
+ /* Continue with this GID */
+ } else if (fflg) {
+ /* Turn off -g, we can use any GID */
+ gflg = false;
+ } else {
+ fprintf (stderr,
+ _("%s: GID '%lu' already exists\n"),
+ Prog, (unsigned long int) group_id);
+ exit (E_GID_IN_USE);
+ }
+ }
+}
+
+/*
+ * check_perms - check if the caller is allowed to add a group
+ *
+ * With PAM support, the setuid bit can be set on groupadd to allow
+ * non-root users to groups.
+ * Without PAM support, only users who can write in the group databases
+ * can add groups.
+ *
+ * It will not return if the user is not allowed.
+ */
+static void check_perms (void)
+{
+#ifdef ACCT_TOOLS_SETUID
+#ifdef USE_PAM
+ pam_handle_t *pamh = NULL;
+ int retval;
+ struct passwd *pampw;
+
+ pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
+ if (NULL == pampw) {
+ fprintf (stderr,
+ _("%s: Cannot determine your user name.\n"),
+ Prog);
+ exit (1);
+ }
+
+ retval = pam_start ("groupadd", pampw->pw_name, &conv, &pamh);
+
+ if (PAM_SUCCESS == retval) {
+ retval = pam_authenticate (pamh, 0);
+ }
+
+ if (PAM_SUCCESS == retval) {
+ retval = pam_acct_mgmt (pamh, 0);
+ }
+
+ if (PAM_SUCCESS != retval) {
+ fprintf (stderr, _("%s: PAM: %s\n"),
+ Prog, pam_strerror (pamh, retval));
+ SYSLOG((LOG_ERR, "%s", pam_strerror (pamh, retval)));
+ if (NULL != pamh) {
+ (void) pam_end (pamh, retval);
+ }
+ exit (1);
+ }
+ (void) pam_end (pamh, retval);
+#endif /* USE_PAM */
+#endif /* ACCT_TOOLS_SETUID */
+}
+
+/*
+ * main - groupadd command
+ */
+int main (int argc, char **argv)
+{
+ /*
+ * Get my name so that I can use it to report errors.
+ */
+ 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);
+ prefix = process_prefix_flag ("-P", argc, argv);
+
+ OPENLOG ("groupadd");
+#ifdef WITH_AUDIT
+ audit_help_open ();
+#endif
+
+ if (atexit (do_cleanups) != 0) {
+ fprintf (stderr,
+ _("%s: Cannot setup cleanup service.\n"),
+ Prog);
+ exit (1);
+ }
+
+ /*
+ * Parse the command line options.
+ */
+ process_flags (argc, argv);
+
+ check_perms ();
+
+#ifdef SHADOWGRP
+ is_shadow_grp = sgr_file_present ();
+#endif
+
+ /*
+ * Do the hard stuff - open the files, create the group entries,
+ * then close and update the files.
+ */
+ open_files ();
+
+ if (!gflg) {
+ if (find_new_gid (rflg, &group_id, NULL) < 0) {
+ exit (E_GID_IN_USE);
+ }
+ }
+
+ grp_update ();
+ close_files ();
+
+ nscd_flush_cache ("group");
+ sssd_flush_cache (SSSD_DB_GROUP);
+
+ return E_SUCCESS;
+}
+
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