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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:54:37 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:54:37 +0000
commit97c26c1924b076ef23ebe4381558e8aa025712b2 (patch)
tree109724175f07436696f51b14b5abbd3f4d704d6d /src/gpasswd.c
parentInitial commit. (diff)
downloadshadow-97c26c1924b076ef23ebe4381558e8aa025712b2.tar.xz
shadow-97c26c1924b076ef23ebe4381558e8aa025712b2.zip
Adding upstream version 1:4.13+dfsg1.upstream/1%4.13+dfsg1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/gpasswd.c')
-rw-r--r--src/gpasswd.c1196
1 files changed, 1196 insertions, 0 deletions
diff --git a/src/gpasswd.c b/src/gpasswd.c
new file mode 100644
index 0000000..5983f78
--- /dev/null
+++ b/src/gpasswd.c
@@ -0,0 +1,1196 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, 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 <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <grp.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include "defines.h"
+#include "groupio.h"
+#include "nscd.h"
+#include "sssd.h"
+#include "prototypes.h"
+#ifdef SHADOWGRP
+#include "sgroupio.h"
+#endif
+/*@-exitarg@*/
+#include "exitcodes.h"
+
+#include "shadowlog.h"
+/*
+ * Global variables
+ */
+/* The name of this command, as it is invoked */
+const char *Prog;
+
+#ifdef SHADOWGRP
+/* Indicate if shadow groups are enabled on the system
+ * (/etc/gshadow present) */
+static bool is_shadowgrp;
+#endif
+
+/* Flags set by options */
+static bool aflg = false;
+static bool Aflg = false;
+static bool dflg = false;
+static bool Mflg = false;
+static bool rflg = false;
+static bool Rflg = false;
+/* The name of the group that is being affected */
+static char *group = NULL;
+/* The name of the user being added (-a) or removed (-d) from group */
+static char *user = NULL;
+/* The new list of members set with -M */
+static char *members = NULL;
+#ifdef SHADOWGRP
+/* The new list of group administrators set with -A */
+static char *admins = NULL;
+#endif
+/* The name of the caller */
+static char *myname = NULL;
+/* The UID of the caller */
+static uid_t bywho;
+/* Indicate if gpasswd was called by root */
+#define amroot (0 == bywho)
+
+/* The number of retries for th user to provide and repeat a new password */
+#ifndef RETRIES
+#define RETRIES 3
+#endif
+
+/* local function prototypes */
+static void usage (int status);
+static void catch_signals (int killed);
+static bool is_valid_user_list (const char *users);
+static void process_flags (int argc, char **argv);
+static void check_flags (int argc, int opt_index);
+static void open_files (void);
+static void close_files (void);
+#ifdef SHADOWGRP
+static void get_group (struct group *gr, struct sgrp *sg);
+static void check_perms (const struct group *gr, const struct sgrp *sg);
+static void update_group (struct group *gr, struct sgrp *sg);
+static void change_passwd (struct group *gr, struct sgrp *sg);
+#else
+static void get_group (struct group *gr);
+static void check_perms (const struct group *gr);
+static void update_group (struct group *gr);
+static void change_passwd (struct group *gr);
+#endif
+static void log_gpasswd_failure (const char *suffix);
+static void log_gpasswd_failure_system (/*@null@*/unused void *arg);
+static void log_gpasswd_failure_group (/*@null@*/unused void *arg);
+#ifdef SHADOWGRP
+static void log_gpasswd_failure_gshadow (/*@null@*/unused void *arg);
+#endif
+static void log_gpasswd_success (const char *suffix);
+static void log_gpasswd_success_system (/*@null@*/unused void *arg);
+static void log_gpasswd_success_group (/*@null@*/unused void *arg);
+
+/*
+ * usage - display usage message
+ */
+static void usage (int status)
+{
+ FILE *usageout = (E_SUCCESS != status) ? stderr : stdout;
+ (void) fprintf (usageout,
+ _("Usage: %s [option] GROUP\n"
+ "\n"
+ "Options:\n"),
+ Prog);
+ (void) fputs (_(" -a, --add USER add USER to GROUP\n"), usageout);
+ (void) fputs (_(" -d, --delete USER remove USER from GROUP\n"), usageout);
+ (void) fputs (_(" -h, --help display this help message and exit\n"), usageout);
+ (void) fputs (_(" -Q, --root CHROOT_DIR directory to chroot into\n"), usageout);
+ (void) fputs (_(" -r, --remove-password remove the GROUP's password\n"), usageout);
+ (void) fputs (_(" -R, --restrict restrict access to GROUP to its members\n"), usageout);
+ (void) fputs (_(" -M, --members USER,... set the list of members of GROUP\n"), usageout);
+#ifdef SHADOWGRP
+ (void) fputs (_(" -A, --administrators ADMIN,...\n"
+ " set the list of administrators for GROUP\n"), usageout);
+ (void) fputs (_("Except for the -A and -M options, the options cannot be combined.\n"), usageout);
+#else
+ (void) fputs (_("The options cannot be combined.\n"), usageout);
+#endif
+ exit (status);
+}
+
+/*
+ * catch_signals - set or reset termio modes.
+ *
+ * catch_signals() is called before processing begins. signal() is then
+ * called with catch_signals() as the signal handler. If signal later
+ * calls catch_signals() with a signal number, the terminal modes are
+ * then reset.
+ */
+static void catch_signals (int killed)
+{
+ static TERMIO sgtty;
+
+ if (0 != killed) {
+ STTY (0, &sgtty);
+ } else {
+ GTTY (0, &sgtty);
+ }
+
+ if (0 != killed) {
+ (void) write (STDOUT_FILENO, "\n", 1);
+ _exit (killed);
+ }
+}
+
+/*
+ * is_valid_user_list - check a comma-separated list of user names for validity
+ *
+ * is_valid_user_list scans a comma-separated list of user names and
+ * checks that each listed name exists is the user database.
+ *
+ * It returns true if the list of users is valid.
+ */
+static bool is_valid_user_list (const char *users)
+{
+ const char *username;
+ char *end;
+ bool is_valid = true;
+ /*@owned@*/char *tmpusers = xstrdup (users);
+
+ for (username = tmpusers;
+ (NULL != username) && ('\0' != *username);
+ username = end) {
+ end = strchr (username, ',');
+ if (NULL != end) {
+ *end = '\0';
+ end++;
+ }
+
+ /*
+ * This user must exist.
+ */
+
+ /* local, no need for xgetpwnam */
+ if (getpwnam (username) == NULL) {
+ fprintf (stderr, _("%s: user '%s' does not exist\n"),
+ Prog, username);
+ is_valid = false;
+ }
+ }
+
+ free (tmpusers);
+
+ return is_valid;
+}
+
+static void failure (void)
+{
+ fprintf (stderr, _("%s: Permission denied.\n"), Prog);
+ log_gpasswd_failure (": Permission denied");
+ exit (E_NOPERM);
+}
+
+/*
+ * process_flags - process the command line options and arguments
+ */
+static void process_flags (int argc, char **argv)
+{
+ int c;
+ static struct option long_options[] = {
+ {"add", required_argument, NULL, 'a'},
+ {"administrators", required_argument, NULL, 'A'},
+ {"delete", required_argument, NULL, 'd'},
+ {"help", no_argument, NULL, 'h'},
+ {"members", required_argument, NULL, 'M'},
+ {"root", required_argument, NULL, 'Q'},
+ {"remove-password", no_argument, NULL, 'r'},
+ {"restrict", no_argument, NULL, 'R'},
+ {NULL, 0, NULL, '\0'}
+ };
+
+ while ((c = getopt_long (argc, argv, "a:A:d:ghM:Q:rR",
+ long_options, NULL)) != -1) {
+ switch (c) {
+ case 'a': /* add a user */
+ aflg = true;
+ user = optarg;
+ /* local, no need for xgetpwnam */
+ if (getpwnam (user) == NULL) {
+ fprintf (stderr,
+ _("%s: user '%s' does not exist\n"),
+ Prog, user);
+ exit (E_BAD_ARG);
+ }
+ break;
+#ifdef SHADOWGRP
+ case 'A': /* set the list of administrators */
+ if (!is_shadowgrp) {
+ fprintf (stderr,
+ _("%s: shadow group passwords required for -A\n"),
+ Prog);
+ exit (E_GSHADOW_NOTFOUND);
+ }
+ admins = optarg;
+ if (!is_valid_user_list (admins)) {
+ exit (E_BAD_ARG);
+ }
+ Aflg = true;
+ break;
+#endif /* SHADOWGRP */
+ case 'd': /* delete a user */
+ dflg = true;
+ user = optarg;
+ break;
+ case 'g': /* no-op from normal password */
+ break;
+ case 'h':
+ usage (E_SUCCESS);
+ break;
+ case 'M': /* set the list of members */
+ members = optarg;
+ if (!is_valid_user_list (members)) {
+ exit (E_BAD_ARG);
+ }
+ Mflg = true;
+ break;
+ case 'Q': /* no-op, handled in process_root_flag () */
+ break;
+ case 'r': /* remove group password */
+ rflg = true;
+ break;
+ case 'R': /* restrict group password */
+ Rflg = true;
+ break;
+ default:
+ usage (E_USAGE);
+ }
+ }
+
+ /* Get the name of the group that is being affected. */
+ group = argv[optind];
+
+ check_flags (argc, optind);
+}
+
+/*
+ * check_flags - check the validity of options
+ */
+static void check_flags (int argc, int opt_index)
+{
+ int exclusive = 0;
+ /*
+ * Make sure exclusive flags are exclusive
+ */
+ if (aflg) {
+ exclusive++;
+ }
+ if (dflg) {
+ exclusive++;
+ }
+ if (rflg) {
+ exclusive++;
+ }
+ if (Rflg) {
+ exclusive++;
+ }
+ if (Aflg || Mflg) {
+ exclusive++;
+ }
+ if (exclusive > 1) {
+ usage (E_USAGE);
+ }
+
+ /*
+ * Make sure one (and only one) group was provided
+ */
+ if ((argc != (opt_index+1)) || (NULL == group)) {
+ usage (E_USAGE);
+ }
+}
+
+/*
+ * open_files - lock and open the group databases
+ *
+ * It will call exit in case of error.
+ */
+static void open_files (void)
+{
+ if (gr_lock () == 0) {
+ fprintf (stderr,
+ _("%s: cannot lock %s; try again later.\n"),
+ Prog, gr_dbname ());
+ exit (E_NOPERM);
+ }
+ add_cleanup (cleanup_unlock_group, NULL);
+
+#ifdef SHADOWGRP
+ if (is_shadowgrp) {
+ if (sgr_lock () == 0) {
+ fprintf (stderr,
+ _("%s: cannot lock %s; try again later.\n"),
+ Prog, sgr_dbname ());
+ exit (E_NOPERM);
+ }
+ add_cleanup (cleanup_unlock_gshadow, NULL);
+ }
+#endif /* SHADOWGRP */
+
+ add_cleanup (log_gpasswd_failure_system, NULL);
+
+ 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_NOPERM);
+ }
+
+#ifdef SHADOWGRP
+ if (is_shadowgrp) {
+ 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_NOPERM);
+ }
+ add_cleanup (log_gpasswd_failure_gshadow, NULL);
+ }
+#endif /* SHADOWGRP */
+
+ add_cleanup (log_gpasswd_failure_group, NULL);
+ del_cleanup (log_gpasswd_failure_system);
+}
+
+static void log_gpasswd_failure (const char *suffix)
+{
+#ifdef WITH_AUDIT
+ char buf[1024];
+#endif
+ if (aflg) {
+ SYSLOG ((LOG_ERR,
+ "%s failed to add user %s to group %s%s",
+ myname, user, group, suffix));
+#ifdef WITH_AUDIT
+ snprintf (buf, 1023,
+ "%s failed to add user %s to group %s%s",
+ myname, user, group, suffix);
+ buf[1023] = '\0';
+ audit_logger (AUDIT_USER_ACCT, Prog,
+ buf,
+ group, AUDIT_NO_ID,
+ SHADOW_AUDIT_FAILURE);
+#endif
+ } else if (dflg) {
+ SYSLOG ((LOG_ERR,
+ "%s failed to remove user %s from group %s%s",
+ myname, user, group, suffix));
+#ifdef WITH_AUDIT
+ snprintf (buf, 1023,
+ "%s failed to remove user %s from group %s%s",
+ myname, user, group, suffix);
+ buf[1023] = '\0';
+ audit_logger (AUDIT_USER_ACCT, Prog,
+ buf,
+ group, AUDIT_NO_ID,
+ SHADOW_AUDIT_FAILURE);
+#endif
+ } else if (rflg) {
+ SYSLOG ((LOG_ERR,
+ "%s failed to remove password of group %s%s",
+ myname, group, suffix));
+#ifdef WITH_AUDIT
+ snprintf (buf, 1023,
+ "%s failed to remove password of group %s%s",
+ myname, group, suffix);
+ buf[1023] = '\0';
+ audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
+ buf,
+ group, AUDIT_NO_ID,
+ SHADOW_AUDIT_FAILURE);
+#endif
+ } else if (Rflg) {
+ SYSLOG ((LOG_ERR,
+ "%s failed to restrict access to group %s%s",
+ myname, group, suffix));
+#ifdef WITH_AUDIT
+ snprintf (buf, 1023,
+ "%s failed to restrict access to group %s%s",
+ myname, group, suffix);
+ buf[1023] = '\0';
+ audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
+ buf,
+ group, AUDIT_NO_ID,
+ SHADOW_AUDIT_FAILURE);
+#endif
+ } else if (Aflg || Mflg) {
+#ifdef SHADOWGRP
+ if (Aflg) {
+ SYSLOG ((LOG_ERR,
+ "%s failed to set the administrators of group %s to %s%s",
+ myname, group, admins, suffix));
+#ifdef WITH_AUDIT
+ snprintf (buf, 1023,
+ "%s failed to set the administrators of group %s to %s%s",
+ myname, group, admins, suffix);
+ buf[1023] = '\0';
+ audit_logger (AUDIT_USER_ACCT, Prog,
+ buf,
+ group, AUDIT_NO_ID,
+ SHADOW_AUDIT_FAILURE);
+#endif
+ }
+#endif /* SHADOWGRP */
+ if (Mflg) {
+ SYSLOG ((LOG_ERR,
+ "%s failed to set the members of group %s to %s%s",
+ myname, group, members, suffix));
+#ifdef WITH_AUDIT
+ snprintf (buf, 1023,
+ "%s failed to set the members of group %s to %s%s",
+ myname, group, members, suffix);
+ buf[1023] = '\0';
+ audit_logger (AUDIT_USER_ACCT, Prog,
+ buf,
+ group, AUDIT_NO_ID,
+ SHADOW_AUDIT_FAILURE);
+#endif
+ }
+ } else {
+ SYSLOG ((LOG_ERR,
+ "%s failed to change password of group %s%s",
+ myname, group, suffix));
+#ifdef WITH_AUDIT
+ snprintf (buf, 1023,
+ "%s failed to change password of group %s%s",
+ myname, group, suffix);
+ buf[1023] = '\0';
+ audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
+ buf,
+ group, AUDIT_NO_ID,
+ SHADOW_AUDIT_FAILURE);
+#endif
+ }
+}
+
+static void log_gpasswd_failure_system (unused void *arg)
+{
+ log_gpasswd_failure ("");
+}
+
+static void log_gpasswd_failure_group (unused void *arg)
+{
+ char buf[1024];
+ snprintf (buf, 1023, " in %s", gr_dbname ());
+ buf[1023] = '\0';
+ log_gpasswd_failure (buf);
+}
+
+#ifdef SHADOWGRP
+static void log_gpasswd_failure_gshadow (unused void *arg)
+{
+ char buf[1024];
+ snprintf (buf, 1023, " in %s", sgr_dbname ());
+ buf[1023] = '\0';
+ log_gpasswd_failure (buf);
+}
+#endif /* SHADOWGRP */
+
+static void log_gpasswd_success (const char *suffix)
+{
+#ifdef WITH_AUDIT
+ char buf[1024];
+#endif
+ if (aflg) {
+ SYSLOG ((LOG_INFO,
+ "user %s added by %s to group %s%s",
+ user, myname, group, suffix));
+#ifdef WITH_AUDIT
+ snprintf (buf, 1023,
+ "user %s added by %s to group %s%s",
+ user, myname, group, suffix);
+ buf[1023] = '\0';
+ audit_logger (AUDIT_USER_ACCT, Prog,
+ buf,
+ group, AUDIT_NO_ID,
+ SHADOW_AUDIT_SUCCESS);
+#endif
+ } else if (dflg) {
+ SYSLOG ((LOG_INFO,
+ "user %s removed by %s from group %s%s",
+ user, myname, group, suffix));
+#ifdef WITH_AUDIT
+ snprintf (buf, 1023,
+ "user %s removed by %s from group %s%s",
+ user, myname, group, suffix);
+ buf[1023] = '\0';
+ audit_logger (AUDIT_USER_ACCT, Prog,
+ buf,
+ group, AUDIT_NO_ID,
+ SHADOW_AUDIT_SUCCESS);
+#endif
+ } else if (rflg) {
+ SYSLOG ((LOG_INFO,
+ "password of group %s removed by %s%s",
+ group, myname, suffix));
+#ifdef WITH_AUDIT
+ snprintf (buf, 1023,
+ "password of group %s removed by %s%s",
+ group, myname, suffix);
+ buf[1023] = '\0';
+ audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
+ buf,
+ group, AUDIT_NO_ID,
+ SHADOW_AUDIT_SUCCESS);
+#endif
+ } else if (Rflg) {
+ SYSLOG ((LOG_INFO,
+ "access to group %s restricted by %s%s",
+ group, myname, suffix));
+#ifdef WITH_AUDIT
+ snprintf (buf, 1023,
+ "access to group %s restricted by %s%s",
+ group, myname, suffix);
+ buf[1023] = '\0';
+ audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
+ buf,
+ group, AUDIT_NO_ID,
+ SHADOW_AUDIT_SUCCESS);
+#endif
+ } else if (Aflg || Mflg) {
+#ifdef SHADOWGRP
+ if (Aflg) {
+ SYSLOG ((LOG_INFO,
+ "administrators of group %s set by %s to %s%s",
+ group, myname, admins, suffix));
+#ifdef WITH_AUDIT
+ snprintf (buf, 1023,
+ "administrators of group %s set by %s to %s%s",
+ group, myname, admins, suffix);
+ buf[1023] = '\0';
+ audit_logger (AUDIT_USER_ACCT, Prog,
+ buf,
+ group, AUDIT_NO_ID,
+ SHADOW_AUDIT_SUCCESS);
+#endif
+ }
+#endif /* SHADOWGRP */
+ if (Mflg) {
+ SYSLOG ((LOG_INFO,
+ "members of group %s set by %s to %s%s",
+ group, myname, members, suffix));
+#ifdef WITH_AUDIT
+ snprintf (buf, 1023,
+ "members of group %s set by %s to %s%s",
+ group, myname, members, suffix);
+ buf[1023] = '\0';
+ audit_logger (AUDIT_USER_ACCT, Prog,
+ buf,
+ group, AUDIT_NO_ID,
+ SHADOW_AUDIT_SUCCESS);
+#endif
+ }
+ } else {
+ SYSLOG ((LOG_INFO,
+ "password of group %s changed by %s%s",
+ group, myname, suffix));
+#ifdef WITH_AUDIT
+ snprintf (buf, 1023,
+ "password of group %s changed by %s%s",
+ group, myname, suffix);
+ buf[1023] = '\0';
+ audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
+ buf,
+ group, AUDIT_NO_ID,
+ SHADOW_AUDIT_SUCCESS);
+#endif
+ }
+}
+
+static void log_gpasswd_success_system (unused void *arg)
+{
+ log_gpasswd_success ("");
+}
+
+static void log_gpasswd_success_group (unused void *arg)
+{
+ char buf[1024];
+ snprintf (buf, 1023, " in %s", gr_dbname ());
+ buf[1023] = '\0';
+ log_gpasswd_success (buf);
+}
+
+/*
+ * close_files - close and unlock the group databases
+ *
+ * This cause any changes in the databases to be committed.
+ *
+ * It will call exit in case of error.
+ */
+static void close_files (void)
+{
+ if (gr_close () == 0) {
+ fprintf (stderr,
+ _("%s: failure while writing changes to %s\n"),
+ Prog, gr_dbname ());
+ exit (E_NOPERM);
+ }
+ add_cleanup (log_gpasswd_success_group, NULL);
+ del_cleanup (log_gpasswd_failure_group);
+
+ cleanup_unlock_group (NULL);
+ del_cleanup (cleanup_unlock_group);
+
+#ifdef SHADOWGRP
+ if (is_shadowgrp) {
+ if (sgr_close () == 0) {
+ fprintf (stderr,
+ _("%s: failure while writing changes to %s\n"),
+ Prog, sgr_dbname ());
+ exit (E_NOPERM);
+ }
+ del_cleanup (log_gpasswd_failure_gshadow);
+
+ cleanup_unlock_gshadow (NULL);
+ del_cleanup (cleanup_unlock_gshadow);
+ }
+#endif /* SHADOWGRP */
+
+ log_gpasswd_success_system (NULL);
+ del_cleanup (log_gpasswd_success_group);
+}
+
+/*
+ * check_perms - check if the user is allowed to change the password of
+ * the specified group.
+ *
+ * It only returns if the user is allowed.
+ */
+#ifdef SHADOWGRP
+static void check_perms (const struct group *gr, const struct sgrp *sg)
+#else
+static void check_perms (const struct group *gr)
+#endif
+{
+ /*
+ * Only root can use the -M and -A options.
+ */
+ if (!amroot && (Aflg || Mflg)) {
+ failure ();
+ }
+
+#ifdef SHADOWGRP
+ if (is_shadowgrp) {
+ /*
+ * The policy here for changing a group is that
+ * 1) you must be root or
+ * 2) you must be listed as an administrative member.
+ * Administrative members can do anything to a group that
+ * the root user can.
+ */
+ if (!amroot && !is_on_list (sg->sg_adm, myname)) {
+ failure ();
+ }
+ } else
+#endif /* SHADOWGRP */
+ {
+#ifdef FIRST_MEMBER_IS_ADMIN
+ /*
+ * The policy here for changing a group is that
+ * 1) you must be root or
+ * 2) you must be the first listed member of the group.
+ * The first listed member of a group can do anything to
+ * that group that the root user can. The rationale for
+ * this hack is that the FIRST user is probably the most
+ * important user in this entire group.
+ *
+ * This feature enabled by default could be a security
+ * problem when installed on existing systems where the
+ * first group member might be just a normal user.
+ * --marekm
+ */
+ if (!amroot) {
+ if (gr->gr_mem[0] == (char *) 0) {
+ failure ();
+ }
+
+ if (strcmp (gr->gr_mem[0], myname) != 0) {
+ failure ();
+ }
+ }
+#else /* ! FIRST_MEMBER_IS_ADMIN */
+ if (!amroot) {
+ failure ();
+ }
+#endif
+ }
+}
+
+/*
+ * update_group - Update the group information in the databases
+ */
+#ifdef SHADOWGRP
+static void update_group (struct group *gr, struct sgrp *sg)
+#else
+static void update_group (struct group *gr)
+#endif
+{
+ if (gr_update (gr) == 0) {
+ fprintf (stderr,
+ _("%s: failed to prepare the new %s entry '%s'\n"),
+ Prog, gr_dbname (), gr->gr_name);
+ exit (1);
+ }
+#ifdef SHADOWGRP
+ if (is_shadowgrp && (sgr_update (sg) == 0)) {
+ fprintf (stderr,
+ _("%s: failed to prepare the new %s entry '%s'\n"),
+ Prog, sgr_dbname (), sg->sg_name);
+ exit (1);
+ }
+#endif /* SHADOWGRP */
+}
+
+/*
+ * get_group - get the current information for the group
+ *
+ * The information are copied in group structure(s) so that they can be
+ * modified later.
+ *
+ * Note: If !is_shadowgrp, *sg will not be initialized.
+ */
+#ifdef SHADOWGRP
+static void get_group (struct group *gr, struct sgrp *sg)
+#else
+static void get_group (struct group *gr)
+#endif
+{
+ struct group const*tmpgr = NULL;
+#ifdef SHADOWGRP
+ struct sgrp const*tmpsg = NULL;
+#endif
+
+ if (gr_open (O_RDONLY) == 0) {
+ fprintf (stderr, _("%s: cannot open %s\n"), Prog, gr_dbname ());
+ SYSLOG ((LOG_WARN, "cannot open %s", gr_dbname ()));
+ exit (E_NOPERM);
+ }
+
+ tmpgr = gr_locate (group);
+ if (NULL == tmpgr) {
+ fprintf (stderr,
+ _("%s: group '%s' does not exist in %s\n"),
+ Prog, group, gr_dbname ());
+ exit (E_BAD_ARG);
+ }
+
+ *gr = *tmpgr;
+ gr->gr_name = xstrdup (tmpgr->gr_name);
+ gr->gr_passwd = xstrdup (tmpgr->gr_passwd);
+ gr->gr_mem = dup_list (tmpgr->gr_mem);
+
+ if (gr_close () == 0) {
+ fprintf (stderr,
+ _("%s: failure while closing read-only %s\n"),
+ Prog, gr_dbname ());
+ SYSLOG ((LOG_ERR,
+ "failure while closing read-only %s",
+ gr_dbname ()));
+ exit (E_NOPERM);
+ }
+
+#ifdef SHADOWGRP
+ if (is_shadowgrp) {
+ if (sgr_open (O_RDONLY) == 0) {
+ fprintf (stderr,
+ _("%s: cannot open %s\n"),
+ Prog, sgr_dbname ());
+ SYSLOG ((LOG_WARN, "cannot open %s", sgr_dbname ()));
+ exit (E_NOPERM);
+ }
+ tmpsg = sgr_locate (group);
+ if (NULL != tmpsg) {
+ *sg = *tmpsg;
+ sg->sg_name = xstrdup (tmpsg->sg_name);
+ sg->sg_passwd = xstrdup (tmpsg->sg_passwd);
+
+ sg->sg_mem = dup_list (tmpsg->sg_mem);
+ sg->sg_adm = dup_list (tmpsg->sg_adm);
+ } else {
+ sg->sg_name = xstrdup (group);
+ sg->sg_passwd = gr->gr_passwd;
+ gr->gr_passwd = SHADOW_PASSWD_STRING; /* XXX warning: const */
+
+ sg->sg_mem = dup_list (gr->gr_mem);
+
+ sg->sg_adm = (char **) xmalloc (sizeof (char *) * 2);
+#ifdef FIRST_MEMBER_IS_ADMIN
+ if (sg->sg_mem[0]) {
+ sg->sg_adm[0] = xstrdup (sg->sg_mem[0]);
+ sg->sg_adm[1] = NULL;
+ } else
+#endif
+ {
+ sg->sg_adm[0] = NULL;
+ }
+
+ }
+ if (sgr_close () == 0) {
+ fprintf (stderr,
+ _("%s: failure while closing read-only %s\n"),
+ Prog, sgr_dbname ());
+ SYSLOG ((LOG_ERR,
+ "failure while closing read-only %s",
+ sgr_dbname ()));
+ exit (E_NOPERM);
+ }
+ }
+#endif /* SHADOWGRP */
+}
+
+/*
+ * change_passwd - change the group's password
+ *
+ * Get the new password from the user and update the password in the
+ * group's structure.
+ *
+ * It will call exit in case of error.
+ */
+#ifdef SHADOWGRP
+static void change_passwd (struct group *gr, struct sgrp *sg)
+#else
+static void change_passwd (struct group *gr)
+#endif
+{
+ char *cp;
+ static char pass[BUFSIZ];
+ int retries;
+ const char *salt;
+
+ /*
+ * A new password is to be entered and it must be encrypted, etc.
+ * The password will be prompted for twice, and both entries must be
+ * identical. There is no need to validate the old password since
+ * the invoker is either the group owner, or root.
+ */
+ printf (_("Changing the password for group %s\n"), group);
+
+ for (retries = 0; retries < RETRIES; retries++) {
+ cp = getpass (_("New Password: "));
+ if (NULL == cp) {
+ exit (1);
+ }
+
+ STRFCPY (pass, cp);
+ strzero (cp);
+ cp = getpass (_("Re-enter new password: "));
+ if (NULL == cp) {
+ exit (1);
+ }
+
+ if (strcmp (pass, cp) == 0) {
+ strzero (cp);
+ break;
+ }
+
+ strzero (cp);
+ memzero (pass, sizeof pass);
+
+ if (retries + 1 < RETRIES) {
+ puts (_("They don't match; try again"));
+ }
+ }
+
+ if (retries == RETRIES) {
+ fprintf (stderr, _("%s: Try again later\n"), Prog);
+ exit (1);
+ }
+
+ salt = crypt_make_salt (NULL, NULL);
+ cp = pw_encrypt (pass, salt);
+ if (NULL == cp) {
+ fprintf (stderr,
+ _("%s: failed to crypt password with salt '%s': %s\n"),
+ Prog, salt, strerror (errno));
+ exit (1);
+ }
+ memzero (pass, sizeof pass);
+#ifdef SHADOWGRP
+ if (is_shadowgrp) {
+ gr->gr_passwd = SHADOW_PASSWD_STRING;
+ sg->sg_passwd = cp;
+ } else
+#endif
+ {
+ gr->gr_passwd = cp;
+ }
+}
+
+/*
+ * gpasswd - administer the /etc/group file
+ */
+int main (int argc, char **argv)
+{
+ struct group grent;
+#ifdef SHADOWGRP
+ struct sgrp sgent;
+#endif
+ struct passwd *pw = NULL;
+
+#ifdef WITH_AUDIT
+ audit_help_open ();
+#endif
+
+ sanitize_env ();
+ (void) setlocale (LC_ALL, "");
+ (void) bindtextdomain (PACKAGE, LOCALEDIR);
+ (void) textdomain (PACKAGE);
+
+ /*
+ * Make a note of whether or not this command was invoked by root.
+ * This will be used to bypass certain checks later on. Also, set
+ * the real user ID to match the effective user ID. This will
+ * prevent the invoker from issuing signals which would interfere
+ * with this command.
+ */
+ bywho = getuid ();
+ Prog = Basename (argv[0]);
+ log_set_progname(Prog);
+ log_set_logfd(stderr);
+
+ OPENLOG ("gpasswd");
+ setbuf (stdout, NULL);
+ setbuf (stderr, NULL);
+
+ process_root_flag ("-Q", argc, argv);
+
+#ifdef SHADOWGRP
+ is_shadowgrp = sgr_file_present ();
+#endif
+
+ /*
+ * Determine the name of the user that invoked this command. This
+ * is really hit or miss because there are so many ways that command
+ * can be executed and so many ways to trip up the routines that
+ * report the user name.
+ */
+ pw = get_my_pwent ();
+ if (NULL == pw) {
+ fprintf (stderr, _("%s: Cannot determine your user name.\n"),
+ Prog);
+ SYSLOG ((LOG_WARN,
+ "Cannot determine the user name of the caller (UID %lu)",
+ (unsigned long) getuid ()));
+ exit (E_NOPERM);
+ }
+ myname = xstrdup (pw->pw_name);
+
+ /*
+ * Register an exit function to warn for any inconsistency that we
+ * could create.
+ */
+ if (atexit (do_cleanups) != 0) {
+ fprintf(stderr, "%s: cannot set exit function\n", Prog);
+ exit (1);
+ }
+
+ /* Parse the options */
+ process_flags (argc, argv);
+
+ /*
+ * Replicate the group so it can be modified later on.
+ */
+#ifdef SHADOWGRP
+ get_group (&grent, &sgent);
+#else
+ get_group (&grent);
+#endif
+
+ /*
+ * Check if the user is allowed to change the password of this group.
+ */
+#ifdef SHADOWGRP
+ check_perms (&grent, &sgent);
+#else
+ check_perms (&grent);
+#endif
+
+ /*
+ * Removing a password is straight forward. Just set the password
+ * field to a "".
+ */
+ if (rflg) {
+#ifdef SHADOWGRP
+ if (is_shadowgrp) {
+ grent.gr_passwd = SHADOW_PASSWD_STRING; /* XXX warning: const */
+ sgent.sg_passwd = ""; /* XXX warning: const */
+ } else
+#endif /* SHADOWGRP */
+ {
+ grent.gr_passwd = ""; /* XXX warning: const */
+ }
+ goto output;
+ } else if (Rflg) {
+ /*
+ * Same thing for restricting the group. Set the password
+ * field to "!".
+ */
+#ifdef SHADOWGRP
+ if (is_shadowgrp) {
+ grent.gr_passwd = SHADOW_PASSWD_STRING; /* XXX warning: const */
+ sgent.sg_passwd = "!"; /* XXX warning: const */
+ } else
+#endif /* SHADOWGRP */
+ {
+ grent.gr_passwd = "!"; /* XXX warning: const */
+ }
+ goto output;
+ }
+
+ /*
+ * Adding a member to a member list is pretty straightforward as
+ * well. Call the appropriate routine and split.
+ */
+ if (aflg) {
+ printf (_("Adding user %s to group %s\n"), user, group);
+ grent.gr_mem = add_list (grent.gr_mem, user);
+#ifdef SHADOWGRP
+ if (is_shadowgrp) {
+ sgent.sg_mem = add_list (sgent.sg_mem, user);
+ }
+#endif
+ goto output;
+ }
+
+ /*
+ * Removing a member from the member list is the same deal as adding
+ * one, except the routine is different.
+ */
+ if (dflg) {
+ bool removed = false;
+
+ printf (_("Removing user %s from group %s\n"), user, group);
+
+ if (is_on_list (grent.gr_mem, user)) {
+ removed = true;
+ grent.gr_mem = del_list (grent.gr_mem, user);
+ }
+#ifdef SHADOWGRP
+ if (is_shadowgrp) {
+ if (is_on_list (sgent.sg_mem, user)) {
+ removed = true;
+ sgent.sg_mem = del_list (sgent.sg_mem, user);
+ }
+ }
+#endif
+ if (!removed) {
+ fprintf (stderr,
+ _("%s: user '%s' is not a member of '%s'\n"),
+ Prog, user, group);
+ exit (E_BAD_ARG);
+ }
+ goto output;
+ }
+#ifdef SHADOWGRP
+ /*
+ * Replacing the entire list of administrators is simple. Check the
+ * list to make sure everyone is a real user. Then slap the new list
+ * in place.
+ */
+ if (Aflg) {
+ sgent.sg_adm = comma_to_list (admins);
+ if (!Mflg) {
+ goto output;
+ }
+ }
+#endif /* SHADOWGRP */
+
+ /*
+ * Replacing the entire list of members is simple. Check the list to
+ * make sure everyone is a real user. Then slap the new list in
+ * place.
+ */
+ if (Mflg) {
+#ifdef SHADOWGRP
+ sgent.sg_mem = comma_to_list (members);
+#endif
+ grent.gr_mem = comma_to_list (members);
+ goto output;
+ }
+
+ /*
+ * If the password is being changed, the input and output must both
+ * be a tty. The typical keyboard signals are caught so the termio
+ * modes can be restored.
+ */
+ if ((isatty (0) == 0) || (isatty (1) == 0)) {
+ fprintf (stderr, _("%s: Not a tty\n"), Prog);
+ exit (E_NOPERM);
+ }
+
+ catch_signals (0); /* save tty modes */
+
+ (void) signal (SIGHUP, catch_signals);
+ (void) signal (SIGINT, catch_signals);
+ (void) signal (SIGQUIT, catch_signals);
+ (void) signal (SIGTERM, catch_signals);
+#ifdef SIGTSTP
+ (void) signal (SIGTSTP, catch_signals);
+#endif
+
+ /* Prompt for the new password */
+#ifdef SHADOWGRP
+ change_passwd (&grent, &sgent);
+#else
+ change_passwd (&grent);
+#endif
+
+ /*
+ * This is the common arrival point to output the new group file.
+ * The freshly crafted entry is in allocated space. The group file
+ * will be locked and opened for writing. The new entry will be
+ * output, etc.
+ */
+ output:
+ if (setuid (0) != 0) {
+ fputs (_("Cannot change ID to root.\n"), stderr);
+ SYSLOG ((LOG_ERR, "can't setuid(0)"));
+ closelog ();
+ exit (E_NOPERM);
+ }
+ pwd_init ();
+
+ open_files ();
+
+#ifdef SHADOWGRP
+ update_group (&grent, &sgent);
+#else
+ update_group (&grent);
+#endif
+
+ close_files ();
+
+ nscd_flush_cache ("group");
+ sssd_flush_cache (SSSD_DB_GROUP);
+
+#ifdef SHADOWGRP
+ if (is_shadowgrp) {
+ free(sgent.sg_adm);
+ free(sgent.sg_mem);
+ }
+#endif
+ free(grent.gr_mem);
+ exit (E_SUCCESS);
+}
+