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