0b695f5a76
crypt_make_salt to force the crypt method and number of rounds. * libmisc/salt.c: Add parameter to SHA_salt_rounds to force the number of rounds. * libmisc/salt.c, lib/getdef.c: ENCRYPT_METHOD and MD5_CRYPT_ENAB are needed also when USE_PAM (e.g. for chpasswd). * src/newusers.c, src/gpasswd.c: Use the new crypt_make_salt prototype. * src/chpasswd.c, src/chgpasswd.c: Add option -c, --crypt-method and -s, --sha-rounds to specify the crypt method and number of rounds in case of one of the SHA methods. The new prototype of crypt_make_salt simplifies the handling of -m, --md5.
412 lines
9.4 KiB
C
412 lines
9.4 KiB
C
/*
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* Copyright 1990 - 1994, Julianne Frances Haugh
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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. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* 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 "pwio.h"
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#include "shadowio.h"
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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 int cflg = 0;
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static int eflg = 0;
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static int md5flg = 0;
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static int sflg = 0;
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static char *crypt_method = NULL;
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static int sha_rounds = 5000;
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static int is_shadow_pwd;
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/* local function prototypes */
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static void usage (void);
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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: chpasswd [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 use MD5 encryption instead DES when the supplied\n"
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" passwords are not encrypted\n"
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"\n"),
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#ifndef ENCRYPTMETHOD_SELECT
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"DES MD5"
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#else
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"DES MD5 SHA256 SHA512"
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#endif
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);
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exit (E_USAGE);
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}
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static long getnumber (const char *numstr)
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{
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long val;
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char *errptr;
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val = strtol (numstr, &errptr, 10);
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if (*errptr || errno == ERANGE) {
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fprintf (stderr, _("%s: invalid numeric argument '%s'\n"), Prog,
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numstr);
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exit (1);
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}
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return val;
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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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const struct spwd *sp;
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struct spwd newsp;
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const struct passwd *pw;
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struct passwd newpw;
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int errors = 0;
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int line = 0;
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long now = time ((long *) 0) / (24L * 3600L);
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int ok;
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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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#endif
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Prog = Basename (argv[0]);
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setlocale (LC_ALL, "");
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bindtextdomain (PACKAGE, LOCALEDIR);
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textdomain (PACKAGE);
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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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{"sha-rounds", required_argument, NULL, 's'},
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{NULL, 0, NULL, '\0'}
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};
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while ((c =
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getopt_long (argc, argv, "c:ehms:", long_options,
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&option_index)) != -1) {
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switch (c) {
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case 'c':
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cflg = 1;
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crypt_method = optarg;
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break;
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case 'e':
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eflg = 1;
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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 = 1;
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break;
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case 's':
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sflg = 1;
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sha_rounds = getnumber(optarg);
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break;
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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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}
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/* validate options */
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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 (md5flg && cflg) {
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fprintf (stderr,
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_("%s: the -m and -c 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 (method, "DES") &&
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0 != strcmp (method, "MD5") &&
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#ifdef ENCRYPTMETHOD_SELECT
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0 != strcmp (method, "SHA256") &&
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0 != strcmp (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, method);
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usage ();
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}
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}
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#ifdef USE_PAM
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retval = PAM_SUCCESS;
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{
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struct passwd *pampw;
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pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
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if (pampw == NULL) {
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retval = PAM_USER_UNKNOWN;
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}
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if (retval == PAM_SUCCESS) {
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retval = pam_start ("chpasswd", pampw->pw_name,
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&conv, &pamh);
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}
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}
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if (retval == PAM_SUCCESS) {
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retval = pam_authenticate (pamh, 0);
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if (retval != PAM_SUCCESS) {
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pam_end (pamh, retval);
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}
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}
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if (retval == PAM_SUCCESS) {
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retval = pam_acct_mgmt (pamh, 0);
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if (retval != PAM_SUCCESS) {
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pam_end (pamh, retval);
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}
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}
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if (retval != PAM_SUCCESS) {
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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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* Lock the password file and open it for reading. This will bring
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* all of the entries into memory where they may be updated.
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*/
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if (!pw_lock ()) {
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fprintf (stderr, _("%s: can't lock password file\n"), Prog);
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exit (1);
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}
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if (!pw_open (O_RDWR)) {
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fprintf (stderr, _("%s: can't open password file\n"), Prog);
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pw_unlock ();
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exit (1);
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}
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is_shadow_pwd = spw_file_present ();
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if (is_shadow_pwd) {
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if (!spw_lock ()) {
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fprintf (stderr, _("%s: can't lock shadow file\n"),
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Prog);
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pw_unlock ();
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exit (1);
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}
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if (!spw_open (O_RDWR)) {
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fprintf (stderr, _("%s: can't open shadow file\n"),
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Prog);
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pw_unlock ();
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spw_unlock ();
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exit (1);
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}
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}
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/*
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* Read each line, separating the user name from the password. The
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* password entry for each user will be looked up in the appropriate
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* file (shadow or passwd) and the password changed. For shadow
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* files the last change date is set directly, for passwd files the
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* last change date is set in the age only if aging information is
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* present.
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*/
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while (fgets (buf, sizeof buf, stdin) != (char *) 0) {
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line++;
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if ((cp = strrchr (buf, '\n'))) {
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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 username is the first field. It is separated from the
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* 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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if ((cp = strchr (name, ':'))) {
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*cp++ = '\0';
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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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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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} else
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crypt_method = "DES";
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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 password file entry for this user. The user must
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* already exist.
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*/
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pw = pw_locate (name);
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if (!pw) {
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fprintf (stderr,
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_("%s: line %d: unknown user %s\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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if (is_shadow_pwd)
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sp = spw_locate (name);
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else
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sp = NULL;
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/*
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* The freshly encrypted new password is merged into the
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* user's password file entry and the last password change
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* date is set to the current date.
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*/
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if (sp) {
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newsp = *sp;
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newsp.sp_pwdp = cp;
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newsp.sp_lstchg = now;
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} else {
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newpw = *pw;
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newpw.pw_passwd = cp;
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}
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/*
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* The updated password file entry is then put back and will
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* be written to the password file later, after all the
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* other entries have been updated as well.
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*/
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if (sp)
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ok = spw_update (&newsp);
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else
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ok = pw_update (&newpw);
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if (!ok) {
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fprintf (stderr,
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_
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("%s: line %d: cannot update password entry\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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/*
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* Any detected errors will cause the entire set of changes to be
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* aborted. Unlocking the password 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 (errors) {
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fprintf (stderr,
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_("%s: error detected, changes ignored\n"), Prog);
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if (is_shadow_pwd)
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spw_unlock ();
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pw_unlock ();
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exit (1);
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}
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if (is_shadow_pwd) {
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if (!spw_close ()) {
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fprintf (stderr,
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_("%s: error updating shadow file\n"), Prog);
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pw_unlock ();
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exit (1);
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}
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spw_unlock ();
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}
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if (!pw_close ()) {
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fprintf (stderr, _("%s: error updating password file\n"), Prog);
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exit (1);
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}
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nscd_flush_cache ("passwd");
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pw_unlock ();
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#ifdef USE_PAM
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if (retval == PAM_SUCCESS)
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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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