538 lines
13 KiB
C
538 lines
13 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 - 2008, 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 USE_PAM
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#include "pam_defs.h"
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#endif /* USE_PAM */
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#include "defines.h"
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#include "exitcodes.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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/*
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* Global variables
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*/
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static char *Prog;
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static bool cflg = false;
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static bool eflg = false;
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static bool md5flg = false;
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static bool sflg = false;
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static const char *crypt_method = NULL;
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static long sha_rounds = 5000;
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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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#ifdef USE_PAM
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static pam_handle_t *pamh = NULL;
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#endif
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/* local function prototypes */
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static void fail_exit (int code);
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static void usage (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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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 void usage (void)
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{
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fprintf (stderr, _("Usage: %s [options]\n"
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"\n"
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"Options:\n"
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" -c, --crypt-method the crypt method (one of %s)\n"
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" -e, --encrypted supplied passwords are encrypted\n"
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" -h, --help display this help message and exit\n"
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" -m, --md5 encrypt the clear text password using\n"
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" the MD5 algorithm\n"
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"%s"
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"\n"),
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Prog,
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#ifndef USE_SHA_CRYPT
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"NONE DES MD5", ""
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#else
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"NONE DES MD5 SHA256 SHA512",
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_(" -s, --sha-rounds number of SHA rounds for the SHA*\n"
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" crypt algorithms\n")
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#endif
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);
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exit (E_USAGE);
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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 option_index = 0;
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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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#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:ehms:",
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#else
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"c:ehm",
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#endif
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long_options, &option_index)) != -1) {
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switch (c) {
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case 'c':
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cflg = true;
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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 ();
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break;
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case 'm':
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md5flg = true;
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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 ();
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}
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break;
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#endif
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case 0:
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/* long option */
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break;
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default:
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usage ();
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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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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 ();
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}
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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 ();
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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 ();
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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 USE_PAM
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int retval = PAM_SUCCESS;
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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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retval = PAM_USER_UNKNOWN;
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}
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if (PAM_SUCCESS == retval) {
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retval = pam_start ("chgpasswd", pampw->pw_name, &conv, &pamh);
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}
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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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(void) pam_end (pamh, retval);
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fprintf (stderr, _("%s: PAM authentication failed\n"), Prog);
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exit (1);
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}
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#endif /* USE_PAM */
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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_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_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_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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if (md5flg) {
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crypt_method = "MD5";
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} else if (crypt_method != NULL) {
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if (sflg) {
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arg = &sha_rounds;
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}
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} else {
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crypt_method = NULL;
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}
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cp = pw_encrypt (newpwd,
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crypt_make_salt(crypt_method, arg));
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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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sg = sgr_locate (name);
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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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} else
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#endif
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{
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newgr = *gr;
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newgr.gr_passwd = cp;
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}
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/*
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* The updated group file entry is then put back and will
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* be written to the group file later, after all the
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* other entries have been updated as well.
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*/
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#ifdef SHADOWGRP
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if (NULL != sg) {
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if (sgr_update (&newsg) == 0) {
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fprintf (stderr,
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_("%s: line %d: failed to prepare the new %s entry '%s'\n"),
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Prog, line, sgr_dbname (), newsg.sg_name);
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errors++;
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continue;
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}
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} else
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#endif
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{
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if (gr_update (&newgr) == 0) {
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fprintf (stderr,
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_("%s: line %d: failed to prepare the new %s entry '%s'\n"),
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Prog, line, gr_dbname (), newgr.gr_name);
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errors++;
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continue;
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}
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}
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}
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/*
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* Any detected errors will cause the entire set of changes to be
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* aborted. Unlocking the group file will cause all of the
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* changes to be ignored. Otherwise the file is closed, causing the
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* changes to be written out all at once, and then unlocked
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* afterwards.
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*/
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if (0 != errors) {
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fprintf (stderr,
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_("%s: error detected, changes ignored\n"), Prog);
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fail_exit (1);
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}
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close_files ();
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nscd_flush_cache ("group");
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#ifdef USE_PAM
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(void) pam_end (pamh, PAM_SUCCESS);
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#endif /* USE_PAM */
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return (0);
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}
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