/* * Copyright (c) 1990 - 1994, Julianne Frances Haugh * Copyright (c) 1996 - 2000, Marek Michałkiewicz * Copyright (c) 2001 - 2006, Tomasz Kłoczko * Copyright (c) 2007 - 2009, Nicolas François * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the copyright holders or contributors may not be used to * endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include #ident "$Id$" #include #include #include #include #include #include #include #include #include "defines.h" #include "groupio.h" #include "nscd.h" #include "prototypes.h" #ifdef SHADOWGRP #include "sgroupio.h" #endif /*@-exitarg@*/ #include "exitcodes.h" /* * Global variables */ /* The name of this command, as it is invoked */ 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 RETSIGTYPE 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 (unused void *arg); static void log_gpasswd_failure_group (unused void *arg); #ifdef SHADOWGRP static void log_gpasswd_failure_gshadow (unused void *arg); #endif static void log_gpasswd_success (const char *suffix); static void log_gpasswd_success_system (unused void *arg); static void log_gpasswd_success_group (unused void *arg); #ifdef SHADOWGRP static void log_gpasswd_success_gshadow (unused void *arg); #endif /* * 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 (_(" -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 RETSIGTYPE catch_signals (int killed) { static TERMIO sgtty; if (0 != killed) { STTY (0, &sgtty); } else { GTTY (0, &sgtty); } if (0 != killed) { (void) putchar ('\n'); (void) fflush (stdout); 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) { char *username, *end; bool is_valid = true; 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 flag; int option_index = 0; static struct option long_options[] = { {"add", required_argument, NULL, 'a'}, {"delete", required_argument, NULL, 'd'}, {"help", no_argument, NULL, 'h'}, {"remove-password", no_argument, NULL, 'r'}, {"restrict", no_argument, NULL, 'R'}, {"administrators", required_argument, NULL, 'A'}, {"members", required_argument, NULL, 'M'}, {NULL, 0, NULL, '\0'} }; while ((flag = getopt_long (argc, argv, "a:A:d:ghM:rR", long_options, &option_index)) != -1) { switch (flag) { 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 '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_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_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); } #ifdef SHADOWGRP static void log_gpasswd_success_gshadow (unused void *arg) { char buf[1024]; snprintf (buf, 1023, " in %s", sgr_dbname ()); buf[1023] = '\0'; log_gpasswd_success (buf); } #endif /* SHADOWGRP */ /* * 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); } add_cleanup (log_gpasswd_success_gshadow, NULL); 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); #ifdef SHADOWGRP if (is_shadowgrp) { del_cleanup (log_gpasswd_success_gshadow); } #endif } /* * 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; /* * 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); } cp = pw_encrypt (pass, crypt_make_salt (NULL, NULL)); memzero (pass, sizeof pass); #ifdef SHADOWGRP if (is_shadowgrp) { 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]); OPENLOG ("gpasswd"); setbuf (stdout, NULL); setbuf (stderr, NULL); #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) { grent.gr_passwd = ""; /* XXX warning: const */ #ifdef SHADOWGRP sgent.sg_passwd = ""; /* XXX warning: const */ #endif goto output; } else if (Rflg) { /* * Same thing for restricting the group. Set the password * field to "!". */ grent.gr_passwd = "!"; /* XXX warning: const */ #ifdef SHADOWGRP sgent.sg_passwd = "!"; /* XXX warning: const */ #endif 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"); exit (E_SUCCESS); }