ee43f47f45
passwd, shadow, group, gshadow etc. can be managed via nss - e.g. system default accounts can be specified using nss_altfiles, rather than in /etc/. Thus despite having default accounts, these files can be missing on disk and thus should be opened with O_CREATE whenever they are attempted to be opened in O_RDWR modes.
588 lines
15 KiB
C
588 lines
15 KiB
C
/*
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* Copyright (c) 1990 - 1994, Julianne Frances Haugh
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* Copyright (c) 2006 , Tomasz Kłoczko
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* Copyright (c) 2006 , Jonas Meurer
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* Copyright (c) 2007 - 2011, Nicolas François
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the copyright holders or contributors may not be used to
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* endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <config.h>
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#ident "$Id$"
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#include <fcntl.h>
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#include <getopt.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.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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#endif /* USE_PAM */
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#endif /* ACCT_TOOLS_SETUID */
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#include "defines.h"
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#include "nscd.h"
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#include "prototypes.h"
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#include "groupio.h"
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#ifdef SHADOWGRP
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#include "sgroupio.h"
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#endif
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/*@-exitarg@*/
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#include "exitcodes.h"
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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 bool eflg = false;
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static bool md5flg = false;
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#ifdef USE_SHA_CRYPT
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static bool sflg = false;
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#endif
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static /*@null@*//*@observer@*/const char *crypt_method = NULL;
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#define cflg (NULL != crypt_method)
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#ifdef USE_SHA_CRYPT
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static long sha_rounds = 5000;
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#endif
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#ifdef SHADOWGRP
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static bool is_shadow_grp;
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static bool sgr_locked = false;
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#endif
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static bool gr_locked = false;
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/* local function prototypes */
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static void fail_exit (int code);
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static /*@noreturn@*/void usage (int status);
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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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static void open_files (void);
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static void close_files (void);
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/*
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* fail_exit - exit with a failure code after unlocking the files
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*/
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static void fail_exit (int code)
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{
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if (gr_locked) {
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if (gr_unlock () == 0) {
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fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ());
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SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ()));
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/* continue */
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}
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}
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#ifdef SHADOWGRP
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if (sgr_locked) {
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if (sgr_unlock () == 0) {
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fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ());
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SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ()));
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/* continue */
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}
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}
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#endif
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exit (code);
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}
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/*
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* usage - display usage message and exit
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*/
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static /*@noreturn@*/void 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]\n"
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"\n"
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"Options:\n"),
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Prog);
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(void) fprintf (usageout,
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_(" -c, --crypt-method METHOD the crypt method (one of %s)\n"),
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#ifndef USE_SHA_CRYPT
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"NONE DES MD5"
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#else /* USE_SHA_CRYPT */
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"NONE DES MD5 SHA256 SHA512"
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#endif /* USE_SHA_CRYPT */
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);
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(void) fputs (_(" -e, --encrypted supplied passwords are encrypted\n"), usageout);
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(void) fputs (_(" -h, --help display this help message and exit\n"), usageout);
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(void) fputs (_(" -m, --md5 encrypt the clear text password using\n"
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" the MD5 algorithm\n"),
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usageout);
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(void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout);
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#ifdef USE_SHA_CRYPT
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(void) fputs (_(" -s, --sha-rounds number of SHA rounds for the SHA*\n"
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" crypt algorithms\n"),
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usageout);
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#endif /* USE_SHA_CRYPT */
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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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* 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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int c;
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static struct option long_options[] = {
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{"crypt-method", required_argument, NULL, 'c'},
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{"encrypted", no_argument, NULL, 'e'},
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{"help", no_argument, NULL, 'h'},
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{"md5", no_argument, NULL, 'm'},
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{"root", required_argument, NULL, 'R'},
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#ifdef USE_SHA_CRYPT
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{"sha-rounds", required_argument, NULL, 's'},
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#endif
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{NULL, 0, NULL, '\0'}
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};
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while ((c = getopt_long (argc, argv,
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#ifdef USE_SHA_CRYPT
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"c:ehmR:s:",
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#else
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"c:ehmR:",
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#endif
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long_options, NULL)) != -1) {
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switch (c) {
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case 'c':
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crypt_method = optarg;
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break;
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case 'e':
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eflg = true;
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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 'm':
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md5flg = 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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#ifdef USE_SHA_CRYPT
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case 's':
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sflg = true;
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if (getlong(optarg, &sha_rounds) == 0) {
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fprintf (stderr,
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_("%s: invalid numeric argument '%s'\n"),
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Prog, optarg);
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usage (E_USAGE);
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}
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break;
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#endif
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default:
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usage (E_USAGE);
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/*@notreached@*/break;
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}
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}
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/* validate options */
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check_flags ();
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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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#ifdef USE_SHA_CRYPT
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if (sflg && !cflg) {
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fprintf (stderr,
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_("%s: %s flag is only allowed with the %s flag\n"),
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Prog, "-s", "-c");
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usage (E_USAGE);
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}
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#endif
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if ((eflg && (md5flg || cflg)) ||
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(md5flg && cflg)) {
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fprintf (stderr,
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_("%s: the -c, -e, and -m flags are exclusive\n"),
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Prog);
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usage (E_USAGE);
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}
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if (cflg) {
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if ( (0 != strcmp (crypt_method, "DES"))
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&& (0 != strcmp (crypt_method, "MD5"))
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&& (0 != strcmp (crypt_method, "NONE"))
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#ifdef USE_SHA_CRYPT
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&& (0 != strcmp (crypt_method, "SHA256"))
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&& (0 != strcmp (crypt_method, "SHA512"))
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#endif
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) {
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fprintf (stderr,
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_("%s: unsupported crypt method: %s\n"),
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Prog, crypt_method);
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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_perms - check if the caller is allowed to add a group
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*
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* With PAM support, the setuid bit can be set on chgpasswd to allow
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* non-root users to groups.
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* Without PAM support, only users who can write in the group databases
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* can add groups.
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*
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* It will not return if the user is not allowed.
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*/
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static void check_perms (void)
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{
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#ifdef ACCT_TOOLS_SETUID
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#ifdef USE_PAM
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pam_handle_t *pamh = NULL;
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int retval;
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struct passwd *pampw;
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pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
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if (NULL == pampw) {
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fprintf (stderr,
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_("%s: Cannot determine your user name.\n"),
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Prog);
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exit (1);
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}
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retval = pam_start ("chgpasswd", pampw->pw_name, &conv, &pamh);
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if (PAM_SUCCESS == retval) {
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retval = pam_authenticate (pamh, 0);
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}
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if (PAM_SUCCESS == retval) {
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retval = pam_acct_mgmt (pamh, 0);
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}
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if (PAM_SUCCESS != retval) {
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fprintf (stderr, _("%s: PAM: %s\n"),
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Prog, pam_strerror (pamh, retval));
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SYSLOG((LOG_ERR, "%s", pam_strerror (pamh, retval)));
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if (NULL != pamh) {
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(void) pam_end (pamh, retval);
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}
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exit (1);
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}
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(void) pam_end (pamh, retval);
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#endif /* USE_PAM */
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#endif /* ACCT_TOOLS_SETUID */
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}
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/*
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* open_files - lock and open the group databases
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*/
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static void open_files (void)
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{
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/*
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* Lock the group file and open it for reading and writing. This will
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* bring all of the entries into memory where they may be updated.
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*/
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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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fail_exit (1);
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}
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gr_locked = true;
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if (gr_open (O_CREAT | O_RDWR) == 0) {
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fprintf (stderr,
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_("%s: cannot open %s\n"), Prog, gr_dbname ());
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fail_exit (1);
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}
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#ifdef SHADOWGRP
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/* Do the same for the shadowed database, if it exist */
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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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fail_exit (1);
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}
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sgr_locked = true;
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if (sgr_open (O_CREAT | O_RDWR) == 0) {
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fprintf (stderr, _("%s: cannot open %s\n"),
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Prog, sgr_dbname ());
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fail_exit (1);
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}
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}
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#endif
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}
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/*
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* close_files - close and unlock the group databases
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*/
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static void close_files (void)
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{
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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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SYSLOG ((LOG_ERR, "failure while writing changes to %s", sgr_dbname ()));
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fail_exit (1);
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}
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if (sgr_unlock () == 0) {
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fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ());
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SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ()));
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/* continue */
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}
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sgr_locked = false;
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}
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#endif
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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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SYSLOG ((LOG_ERR, "failure while writing changes to %s", gr_dbname ()));
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fail_exit (1);
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}
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if (gr_unlock () == 0) {
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fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ());
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SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ()));
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/* continue */
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}
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gr_locked = false;
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}
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int main (int argc, char **argv)
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{
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char buf[BUFSIZ];
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char *name;
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char *newpwd;
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char *cp;
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#ifdef SHADOWGRP
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const struct sgrp *sg;
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struct sgrp newsg;
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#endif
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const struct group *gr;
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struct group newgr;
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int errors = 0;
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int line = 0;
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Prog = Basename (argv[0]);
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(void) setlocale (LC_ALL, "");
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(void) bindtextdomain (PACKAGE, LOCALEDIR);
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(void) textdomain (PACKAGE);
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process_root_flag ("-R", argc, argv);
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process_flags (argc, argv);
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OPENLOG ("chgpasswd");
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check_perms ();
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#ifdef SHADOWGRP
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is_shadow_grp = sgr_file_present ();
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#endif
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open_files ();
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/*
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* Read each line, separating the group name from the password. The
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* group entry for each group will be looked up in the appropriate
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* file (gshadow or group) and the password changed.
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*/
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while (fgets (buf, (int) sizeof buf, stdin) != (char *) 0) {
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line++;
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cp = strrchr (buf, '\n');
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if (NULL != cp) {
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*cp = '\0';
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} else {
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fprintf (stderr, _("%s: line %d: line too long\n"),
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Prog, line);
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errors++;
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continue;
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}
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/*
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* The group's name is the first field. It is separated from
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* the password with a ":" character which is replaced with a
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* NUL to give the new password. The new password will then
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* be encrypted in the normal fashion with a new salt
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* generated, unless the '-e' is given, in which case it is
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* assumed to already be encrypted.
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*/
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name = buf;
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cp = strchr (name, ':');
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if (NULL != cp) {
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*cp = '\0';
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cp++;
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} else {
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fprintf (stderr,
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_("%s: line %d: missing new password\n"),
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Prog, line);
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errors++;
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continue;
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}
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newpwd = cp;
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if ( (!eflg)
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&& ( (NULL == crypt_method)
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|| (0 != strcmp (crypt_method, "NONE")))) {
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void *arg = NULL;
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const char *salt;
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if (md5flg) {
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crypt_method = "MD5";
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}
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#ifdef USE_SHA_CRYPT
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if (sflg) {
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arg = &sha_rounds;
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}
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#endif
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salt = crypt_make_salt (crypt_method, arg);
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cp = pw_encrypt (newpwd, salt);
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if (NULL == cp) {
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fprintf (stderr,
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_("%s: failed to crypt password with salt '%s': %s\n"),
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Prog, salt, strerror (errno));
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fail_exit (1);
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}
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}
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/*
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* Get the group file entry for this group. The group must
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* already exist.
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*/
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gr = gr_locate (name);
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if (NULL == gr) {
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fprintf (stderr,
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_("%s: line %d: group '%s' does not exist\n"), Prog,
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line, name);
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errors++;
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continue;
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}
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#ifdef SHADOWGRP
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if (is_shadow_grp) {
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/* The gshadow entry should be updated if the
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* group entry has a password set to 'x'.
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* But on the other hand, if there is already both
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* a group and a gshadow password, it's preferable
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* to update both.
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*/
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sg = sgr_locate (name);
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if ( (NULL == sg)
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&& (strcmp (gr->gr_passwd,
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SHADOW_PASSWD_STRING) == 0)) {
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static char *empty = NULL;
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/* If the password is set to 'x' in
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* group, but there are no entries in
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* gshadow, create one.
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*/
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newsg.sg_name = name;
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/* newsg.sg_passwd = NULL; will be set later */
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newsg.sg_adm = ∅
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newsg.sg_mem = dup_list (gr->gr_mem);
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sg = &newsg;
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}
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} else {
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sg = NULL;
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}
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#endif
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/*
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* The freshly encrypted new password is merged into the
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* group's entry.
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*/
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#ifdef SHADOWGRP
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if (NULL != sg) {
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newsg = *sg;
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newsg.sg_passwd = cp;
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}
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if ( (NULL == sg)
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|| (strcmp (gr->gr_passwd, SHADOW_PASSWD_STRING) != 0))
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#endif
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{
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newgr = *gr;
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newgr.gr_passwd = cp;
|
|
}
|
|
|
|
/*
|
|
* The updated group file entry is then put back and will
|
|
* be written to the group file later, after all the
|
|
* other entries have been updated as well.
|
|
*/
|
|
#ifdef SHADOWGRP
|
|
if (NULL != sg) {
|
|
if (sgr_update (&newsg) == 0) {
|
|
fprintf (stderr,
|
|
_("%s: line %d: failed to prepare the new %s entry '%s'\n"),
|
|
Prog, line, sgr_dbname (), newsg.sg_name);
|
|
errors++;
|
|
continue;
|
|
}
|
|
}
|
|
if ( (NULL == sg)
|
|
|| (strcmp (gr->gr_passwd, SHADOW_PASSWD_STRING) != 0))
|
|
#endif
|
|
{
|
|
if (gr_update (&newgr) == 0) {
|
|
fprintf (stderr,
|
|
_("%s: line %d: failed to prepare the new %s entry '%s'\n"),
|
|
Prog, line, gr_dbname (), newgr.gr_name);
|
|
errors++;
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Any detected errors will cause the entire set of changes to be
|
|
* aborted. Unlocking the group file will cause all of the
|
|
* changes to be ignored. Otherwise the file is closed, causing the
|
|
* changes to be written out all at once, and then unlocked
|
|
* afterwards.
|
|
*/
|
|
if (0 != errors) {
|
|
fprintf (stderr,
|
|
_("%s: error detected, changes ignored\n"), Prog);
|
|
fail_exit (1);
|
|
}
|
|
|
|
close_files ();
|
|
|
|
nscd_flush_cache ("group");
|
|
|
|
return (0);
|
|
}
|
|
|