From 97c26c1924b076ef23ebe4381558e8aa025712b2 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 16:54:37 +0200 Subject: Adding upstream version 1:4.13+dfsg1. Signed-off-by: Daniel Baumann --- src/groupadd.c | 632 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 632 insertions(+) create mode 100644 src/groupadd.c (limited to 'src/groupadd.c') diff --git a/src/groupadd.c b/src/groupadd.c new file mode 100644 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 + +#ident "$Id$" + +#include +#include +#include +#include +#include +#include +#ifdef ACCT_TOOLS_SETUID +#ifdef USE_PAM +#include "pam_defs.h" +#include +#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; +} + -- cgit v1.2.3