/* * Copyright (c) 2000 , International Business Machines * George Kraft IV, gk4@us.ibm.com, 03/23/2000 * Copyright (c) 2000 - 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 #include #include #include #include #include #ifdef USE_PAM #include "pam_defs.h" #endif /* USE_PAM */ #include #include "defines.h" #include "prototypes.h" #include "groupio.h" #ifdef SHADOWGRP #include "sgroupio.h" #endif /* Exit Status Values */ /*@-exitarg@*/ #define EXIT_SUCCESS 0 /* success */ #define EXIT_USAGE 1 /* invalid command syntax */ #define EXIT_GROUP_FILE 2 /* group file access problems */ #define EXIT_NOT_ROOT 3 /* not superuser */ #define EXIT_NOT_EROOT 4 /* not effective superuser */ #define EXIT_NOT_PRIMARY 5 /* not primary owner of group */ #define EXIT_NOT_MEMBER 6 /* member of group does not exist */ #define EXIT_MEMBER_EXISTS 7 /* member of group already exists */ #define EXIT_INVALID_USER 8 /* specified user does not exist */ #define EXIT_INVALID_GROUP 9 /* specified group does not exist */ /* * Global variables */ char *Prog; static char *adduser = NULL; static char *deluser = NULL; static char *thisgroup = NULL; static bool purge = false; static bool list = false; static int exclusive = 0; static bool gr_locked = false; #ifdef SHADOWGRP /* Indicate if shadow groups are enabled on the system * (/etc/gshadow present) */ static bool is_shadowgrp; static bool sgr_locked = false; #endif /* local function prototypes */ static char *whoami (void); static void add_user (const char *user, const struct group *grp); static void remove_user (const char *user, const struct group *grp); static void purge_members (const struct group *grp); static void display_members (const char *const *members); static void usage (int status); static void process_flags (int argc, char **argv); static void check_perms (void); static void fail_exit (int code); #define isroot() (getuid () == 0) static char *whoami (void) { /* local, no need for xgetgrgid */ struct group *grp = getgrgid (getgid ()); /* local, no need for xgetpwuid */ struct passwd *usr = getpwuid (getuid ()); if ( (NULL != usr) && (NULL != grp) && (0 == strcmp (usr->pw_name, grp->gr_name))) { return xstrdup (usr->pw_name); } else { return NULL; } } /* * add_user - Add an user to the specified group */ static void add_user (const char *user, const struct group *grp) { struct group *newgrp; /* Make sure the user is not already part of the group */ if (is_on_list (grp->gr_mem, user)) { fprintf (stderr, _("%s: user '%s' is already a member of '%s'\n"), Prog, user, grp->gr_name); fail_exit (EXIT_MEMBER_EXISTS); } newgrp = __gr_dup(grp); if (NULL == newgrp) { fprintf (stderr, _("%s: Out of memory. Cannot update %s.\n"), Prog, gr_dbname ()); fail_exit (13); } /* Add the user to the /etc/group group */ newgrp->gr_mem = add_list (newgrp->gr_mem, user); #ifdef SHADOWGRP if (is_shadowgrp) { const struct sgrp *sg = sgr_locate (newgrp->gr_name); struct sgrp *newsg; if (NULL == sg) { /* Create a shadow group based on this group */ static struct sgrp sgrent; sgrent.sg_name = xstrdup (newgrp->gr_name); sgrent.sg_mem = dup_list (newgrp->gr_mem); sgrent.sg_adm = (char **) xmalloc (sizeof (char *)); #ifdef FIRST_MEMBER_IS_ADMIN if (sgrent.sg_mem[0]) { sgrent.sg_adm[0] = xstrdup (sgrent.sg_mem[0]); sgrent.sg_adm[1] = NULL; } else #endif { sgrent.sg_adm[0] = NULL; } /* Move any password to gshadow */ sgrent.sg_passwd = newgrp->gr_passwd; newgrp->gr_passwd = SHADOW_PASSWD_STRING; newsg = &sgrent; } else { newsg = __sgr_dup (sg); if (NULL == newsg) { fprintf (stderr, _("%s: Out of memory. Cannot update %s.\n"), Prog, sgr_dbname ()); fail_exit (13); } /* Add the user to the members */ newsg->sg_mem = add_list (newsg->sg_mem, user); /* Do not touch the administrators */ } if (sgr_update (newsg) == 0) { fprintf (stderr, _("%s: failed to prepare the new %s entry '%s'\n"), Prog, sgr_dbname (), newsg->sg_name); fail_exit (13); } } #endif if (gr_update (newgrp) == 0) { fprintf (stderr, _("%s: failed to prepare the new %s entry '%s'\n"), Prog, gr_dbname (), newgrp->gr_name); fail_exit (13); } } /* * remove_user - Remove an user from a given group */ static void remove_user (const char *user, const struct group *grp) { struct group *newgrp; /* Check if the user is a member of the specified group */ if (!is_on_list (grp->gr_mem, user)) { fprintf (stderr, _("%s: user '%s' is not a member of '%s'\n"), Prog, user, grp->gr_name); fail_exit (EXIT_NOT_MEMBER); } newgrp = __gr_dup (grp); if (NULL == newgrp) { fprintf (stderr, _("%s: Out of memory. Cannot update %s.\n"), Prog, gr_dbname ()); fail_exit (13); } /* Remove the user from the /etc/group group */ newgrp->gr_mem = del_list (newgrp->gr_mem, user); #ifdef SHADOWGRP if (is_shadowgrp) { const struct sgrp *sg = sgr_locate (newgrp->gr_name); struct sgrp *newsg; if (NULL == sg) { /* Create a shadow group based on this group */ static struct sgrp sgrent; sgrent.sg_name = xstrdup (newgrp->gr_name); sgrent.sg_mem = dup_list (newgrp->gr_mem); sgrent.sg_adm = (char **) xmalloc (sizeof (char *)); #ifdef FIRST_MEMBER_IS_ADMIN if (sgrent.sg_mem[0]) { sgrent.sg_adm[0] = xstrdup (sgrent.sg_mem[0]); sgrent.sg_adm[1] = NULL; } else #endif { sgrent.sg_adm[0] = NULL; } /* Move any password to gshadow */ sgrent.sg_passwd = newgrp->gr_passwd; newgrp->gr_passwd = SHADOW_PASSWD_STRING; newsg = &sgrent; } else { newsg = __sgr_dup (sg); if (NULL == newsg) { fprintf (stderr, _("%s: Out of memory. Cannot update %s.\n"), Prog, sgr_dbname ()); fail_exit (13); } /* Remove the user from the members */ newsg->sg_mem = del_list (newsg->sg_mem, user); /* Remove the user from the administrators */ newsg->sg_adm = del_list (newsg->sg_adm, user); } if (sgr_update (newsg) == 0) { fprintf (stderr, _("%s: failed to prepare the new %s entry '%s'\n"), Prog, sgr_dbname (), newsg->sg_name); fail_exit (13); } } #endif if (gr_update (newgrp) == 0) { fprintf (stderr, _("%s: failed to prepare the new %s entry '%s'\n"), Prog, gr_dbname (), newgrp->gr_name); fail_exit (13); } } /* * purge_members - Rmeove every members of the specified group */ static void purge_members (const struct group *grp) { struct group *newgrp = __gr_dup (grp); if (NULL == newgrp) { fprintf (stderr, _("%s: Out of memory. Cannot update %s.\n"), Prog, gr_dbname ()); fail_exit (13); } /* Remove all the members of the /etc/group group */ newgrp->gr_mem[0] = NULL; #ifdef SHADOWGRP if (is_shadowgrp) { const struct sgrp *sg = sgr_locate (newgrp->gr_name); struct sgrp *newsg; if (NULL == sg) { /* Create a shadow group based on this group */ static struct sgrp sgrent; sgrent.sg_name = xstrdup (newgrp->gr_name); sgrent.sg_mem = (char **) xmalloc (sizeof (char *)); sgrent.sg_mem[0] = NULL; sgrent.sg_adm = (char **) xmalloc (sizeof (char *)); sgrent.sg_adm[0] = NULL; /* Move any password to gshadow */ sgrent.sg_passwd = newgrp->gr_passwd; newgrp->gr_passwd = xstrdup(SHADOW_PASSWD_STRING); newsg = &sgrent; } else { newsg = __sgr_dup (sg); if (NULL == newsg) { fprintf (stderr, _("%s: Out of memory. Cannot update %s.\n"), Prog, sgr_dbname ()); fail_exit (13); } /* Remove all the members of the /etc/gshadow * group */ newsg->sg_mem[0] = NULL; /* Remove all the administrators of the * /etc/gshadow group */ newsg->sg_adm[0] = NULL; } if (sgr_update (newsg) == 0) { fprintf (stderr, _("%s: failed to prepare the new %s entry '%s'\n"), Prog, sgr_dbname (), newsg->sg_name); fail_exit (13); } } #endif if (gr_update (newgrp) == 0) { fprintf (stderr, _("%s: failed to prepare the new %s entry '%s'\n"), Prog, gr_dbname (), newgrp->gr_name); fail_exit (13); } } static void display_members (const char *const *members) { int i; for (i = 0; NULL != members[i]; i++) { printf ("%s ", members[i]); if (NULL == members[i + 1]) { printf ("\n"); } else { printf (" "); } } } static void usage (int status) { FILE *usageout = (EXIT_SUCCESS != status) ? stderr : stdout; (void) fprintf (usageout, _("Usage: %s [options] [action]\n" "\n" "Options:\n"), Prog); (void) fputs (_(" -g, --group groupname change groupname instead of the user's group\n" " (root only)\n"), usageout); (void) fputs (_("\n"), usageout); (void) fputs (_("Actions:\n"), usageout); (void) fputs (_(" -a, --add username add username to the members of the group\n"), usageout); (void) fputs (_(" -d, --delete username remove username from the members of the group\n"), usageout); (void) fputs (_(" -h, --help display this help message and exit\n"), usageout); (void) fputs (_(" -p, --purge purge all members from the group\n"), usageout); (void) fputs (_(" -l, --list list the members of the group\n"), usageout); fail_exit (status); } /* * process_flags - perform command line argument setting */ static void process_flags (int argc, char **argv) { int arg; int option_index = 0; static struct option long_options[] = { {"add", required_argument, NULL, 'a'}, {"delete", required_argument, NULL, 'd'}, {"group", required_argument, NULL, 'g'}, {"help", no_argument, NULL, 'h'}, {"list", no_argument, NULL, 'l'}, {"purge", no_argument, NULL, 'p'}, {NULL, 0, NULL, '\0'} }; while ((arg = getopt_long (argc, argv, "a:d:g:hlp", long_options, &option_index)) != EOF) { switch (arg) { case 'a': adduser = xstrdup (optarg); ++exclusive; break; case 'd': deluser = xstrdup (optarg); ++exclusive; break; case 'g': thisgroup = xstrdup (optarg); break; case 'h': usage (EXIT_SUCCESS); break; case 'l': list = true; ++exclusive; break; case 'p': purge = true; ++exclusive; break; default: usage (EXIT_USAGE); } } if ((exclusive > 1) || (optind < argc)) { usage (EXIT_USAGE); } /* local, no need for xgetpwnam */ if ( (NULL != adduser) && (getpwnam (adduser) == NULL)) { fprintf (stderr, _("%s: user '%s' does not exist\n"), Prog, adduser); fail_exit (EXIT_INVALID_USER); } } static void check_perms (void) { if (!list) { #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); fail_exit (1); } retval = pam_start ("groupmems", 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 (NULL != pamh) { (void) pam_end (pamh, retval); } if (PAM_SUCCESS != retval) { fprintf (stderr, _("%s: PAM authentication failed\n"), Prog); fail_exit (1); } #endif } } static void fail_exit (int code) { if (gr_locked) { if (gr_unlock () == 0) { fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ()); SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ())); /* continue */ } } #ifdef SHADOWGRP if (sgr_locked) { if (sgr_unlock () == 0) { fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ()); SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ())); /* continue */ } } #endif exit (code); } static void open_files (void) { if (!list) { if (gr_lock () == 0) { fprintf (stderr, _("%s: cannot lock %s; try again later.\n"), Prog, gr_dbname ()); fail_exit (EXIT_GROUP_FILE); } gr_locked = true; #ifdef SHADOWGRP if (is_shadowgrp) { if (sgr_lock () == 0) { fprintf (stderr, _("%s: cannot lock %s; try again later.\n"), Prog, sgr_dbname ()); fail_exit (EXIT_GROUP_FILE); } sgr_locked = true; } #endif } if (gr_open (list ? O_RDONLY : O_RDWR) == 0) { fprintf (stderr, _("%s: cannot open %s\n"), Prog, gr_dbname ()); fail_exit (EXIT_GROUP_FILE); } #ifdef SHADOWGRP if (is_shadowgrp) { if (sgr_open (list ? O_RDONLY : O_RDWR) == 0) { fprintf (stderr, _("%s: cannot open %s\n"), Prog, sgr_dbname ()); fail_exit (EXIT_GROUP_FILE); } } #endif } static void close_files (void) { if ((gr_close () == 0) && !list) { fprintf (stderr, _("%s: failure while writing changes to %s\n"), Prog, gr_dbname ()); SYSLOG ((LOG_ERR, "failure while writing changes to %s", gr_dbname ())); fail_exit (EXIT_GROUP_FILE); } if (gr_locked) { if (gr_unlock () == 0) { fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ()); SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ())); /* continue */ } gr_locked = false; } #ifdef SHADOWGRP if (is_shadowgrp) { if ((sgr_close () == 0) && !list) { fprintf (stderr, _("%s: failure while writing changes to %s\n"), Prog, sgr_dbname ()); SYSLOG ((LOG_ERR, "failure while writing changes to %s", sgr_dbname ())); fail_exit (EXIT_GROUP_FILE); } if (sgr_locked) { if (sgr_unlock () == 0) { fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ()); SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ())); /* continue */ } sgr_locked = false; } } #endif } int main (int argc, char **argv) { char *name; const struct group *grp; /* * Get my name so that I can use it to report errors. */ Prog = Basename (argv[0]); OPENLOG ("groupmems"); (void) setlocale (LC_ALL, ""); (void) bindtextdomain (PACKAGE, LOCALEDIR); (void) textdomain (PACKAGE); #ifdef SHADOWGRP is_shadowgrp = sgr_file_present (); #endif process_flags (argc, argv); if (NULL == thisgroup) { name = whoami (); if (!list && (NULL == name)) { fprintf (stderr, _("%s: your groupname does not match your username\n"), Prog); fail_exit (EXIT_NOT_PRIMARY); } } else { name = thisgroup; if (!list && !isroot ()) { fprintf (stderr, _("%s: only root can use the -g/--group option\n"), Prog); fail_exit (EXIT_NOT_ROOT); } } check_perms (); open_files (); grp = gr_locate (name); if (NULL == grp) { fprintf (stderr, _("%s: group '%s' does not exist in %s\n"), Prog, name, gr_dbname ()); fail_exit (EXIT_INVALID_GROUP); } if (list) { display_members ((const char *const *)grp->gr_mem); } else if (NULL != adduser) { add_user (adduser, grp); } else if (NULL != deluser) { remove_user (deluser, grp); } else if (purge) { purge_members (grp); } close_files (); exit (EXIT_SUCCESS); }