shadow/src/chgpasswd.c

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/*
* Copyright 1990 - 1994, Julianne Frances Haugh
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#ident "$Id$"
#include <fcntl.h>
#include <getopt.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef USE_PAM
#include "pam_defs.h"
#endif /* USE_PAM */
#include "defines.h"
#include "nscd.h"
#include "prototypes.h"
#include "groupio.h"
#ifdef SHADOWGRP
#include "sgroupio.h"
#endif
/*
* Global variables
*/
static char *Prog;
static int cflg = 0;
static int eflg = 0;
static int md5flg = 0;
static int sflg = 0;
static char *crypt_method = NULL;
static int sha_rounds = 5000;
#ifdef SHADOWGRP
static int is_shadow_grp;
#endif
/* local function prototypes */
static void usage (void);
/*
* usage - display usage message and exit
*/
static void usage (void)
{
fprintf (stderr, _("Usage: chgpasswd [options]\n"
"\n"
"Options:\n"
" -c, --crypt-method the crypt method (one of %s)\n"
" -e, --encrypted supplied passwords are encrypted\n"
" -h, --help display this help message and exit\n"
" -m, --md5 use MD5 encryption instead DES when the supplied\n"
" passwords are not encrypted\n"
"\n"),
#ifndef ENCRYPTMETHOD_SELECT
"DES MD5"
#else
"DES MD5 SHA256 SHA512"
#endif
);
exit (1);
}
static long getnumber (const char *numstr)
{
long val;
char *errptr;
val = strtol (numstr, &errptr, 10);
if (*errptr || errno == ERANGE) {
fprintf (stderr, _("%s: invalid numeric argument '%s'\n"), Prog,
numstr);
exit (1);
}
return val;
}
int main (int argc, char **argv)
{
char buf[BUFSIZ];
char *name;
char *newpwd;
char *cp;
#ifdef SHADOWGRP
const struct sgrp *sg;
struct sgrp newsg;
#endif
const struct group *gr;
int errors = 0;
int line = 0;
int ok;
#ifdef USE_PAM
pam_handle_t *pamh = NULL;
int retval;
#endif
#ifndef SHADOWGRP
struct group newgr;
#endif
Prog = Basename (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
{
int option_index = 0;
int c;
static struct option long_options[] = {
{"crypt-method", required_argument, NULL, 'c'},
{"encrypted", no_argument, NULL, 'e'},
{"help", no_argument, NULL, 'h'},
{"md5", no_argument, NULL, 'm'},
{"sha-rounds", required_argument, NULL, 's'},
{NULL, 0, NULL, '\0'}
};
while ((c =
getopt_long (argc, argv, "c:ehms:", long_options,
&option_index)) != -1) {
switch (c) {
case 'c':
cflg = 1;
crypt_method = optarg;
break;
case 'e':
eflg = 1;
break;
case 'h':
usage ();
break;
case 'm':
md5flg = 1;
break;
case 's':
sflg = 1;
sha_rounds = getnumber(optarg);
break;
case 0:
/* long option */
break;
default:
usage ();
break;
}
}
}
/* validate options */
if (sflg && !cflg) {
fprintf (stderr,
_("%s: %s flag is ONLY allowed with the %s flag\n"),
Prog, "-s", "-c");
usage ();
}
if (md5flg && cflg) {
fprintf (stderr,
_("%s: the -m and -c flags are exclusive\n"),
Prog);
usage ();
}
if (cflg) {
if (0 != strcmp (method, "DES") &&
0 != strcmp (method, "MD5") &&
#ifdef ENCRYPTMETHOD_SELECT
0 != strcmp (method, "SHA256") &&
0 != strcmp (method, "SHA512")
#endif
) {
fprintf (stderr,
_("%s: unsupported crypt method: %s\n"),
Prog, method);
usage ();
}
}
#ifdef USE_PAM
retval = PAM_SUCCESS;
* lib/prototypes.h, configure.in, libmisc/Makefile.am, libmisc/xgetXXbyYY.c, libmisc/xgetpwnam.c, libmisc/xgetpwuid.c, libmisc/xgetgrnam.c, libmisc/xgetgrgid.c, libmisc/xgetspnam.c: Added functions xgetpwnam(), xgetpwuid(), xgetgrnam(), xgetgrgid(), and xgetspnam(). They allocate memory for the returned structure and are more robust to successive calls. They are implemented with the libc's getxxyyy_r() functions if available. * libmisc/limits.c, libmisc/entry.c, libmisc/chowntty.c, libmisc/addgrps.c, libmisc/myname.c, libmisc/rlogin.c, libmisc/pwdcheck.c, src/newgrp.c, src/login_nopam.c, src/userdel.c, src/lastlog.c, src/grpck.c, src/gpasswd.c, src/newusers.c, src/chpasswd.c, src/chfn.c, src/groupmems.c, src/usermod.c, src/expiry.c, src/groupdel.c, src/chgpasswd.c, src/su.c, src/useradd.c, src/groupmod.c, src/passwd.c, src/pwck.c, src/groupadd.c, src/chage.c, src/login.c, src/suauth.c, src/faillog.c, src/groups.c, src/chsh.c, src/id.c: Review all the usage of one of the getpwnam(), getpwuid(), getgrnam(), getgrgid(), and getspnam() functions. It was noticed on http://bugs.debian.org/341230 that chfn and chsh use a passwd structure after calling a pam function, which result in using information from the passwd structure requested by pam, not the original one. It is much easier to use the new xget... functions to avoid these issues. I've checked which call to the original get... functions could be left (reducing the scope of the structure if possible), and I've left comments to ease future reviews (e.g. /* local, no need for xgetpwnam */). Note: the getpwent/getgrent calls should probably be checked also. * src/groupdel.c, src/expiry.c: Fix typos in comments. * src/groupmod.c: Re-indent. * libmisc/Makefile.am, lib/groupmem.c, lib/groupio.c, lib/pwmem.c, lib/pwio.c, lib/shadowmem.c, lib/shadowio.c: Move the __<xx>_dup functions (used by the xget... functions) from the <xx>io.c files to the new <xx>mem.c files. This avoid linking some utils against the SELinux library.
2007-11-19 04:45:26 +05:30
{
struct passwd *pampw;
pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
if (pampw == NULL) {
retval = PAM_USER_UNKNOWN;
}
* lib/prototypes.h, configure.in, libmisc/Makefile.am, libmisc/xgetXXbyYY.c, libmisc/xgetpwnam.c, libmisc/xgetpwuid.c, libmisc/xgetgrnam.c, libmisc/xgetgrgid.c, libmisc/xgetspnam.c: Added functions xgetpwnam(), xgetpwuid(), xgetgrnam(), xgetgrgid(), and xgetspnam(). They allocate memory for the returned structure and are more robust to successive calls. They are implemented with the libc's getxxyyy_r() functions if available. * libmisc/limits.c, libmisc/entry.c, libmisc/chowntty.c, libmisc/addgrps.c, libmisc/myname.c, libmisc/rlogin.c, libmisc/pwdcheck.c, src/newgrp.c, src/login_nopam.c, src/userdel.c, src/lastlog.c, src/grpck.c, src/gpasswd.c, src/newusers.c, src/chpasswd.c, src/chfn.c, src/groupmems.c, src/usermod.c, src/expiry.c, src/groupdel.c, src/chgpasswd.c, src/su.c, src/useradd.c, src/groupmod.c, src/passwd.c, src/pwck.c, src/groupadd.c, src/chage.c, src/login.c, src/suauth.c, src/faillog.c, src/groups.c, src/chsh.c, src/id.c: Review all the usage of one of the getpwnam(), getpwuid(), getgrnam(), getgrgid(), and getspnam() functions. It was noticed on http://bugs.debian.org/341230 that chfn and chsh use a passwd structure after calling a pam function, which result in using information from the passwd structure requested by pam, not the original one. It is much easier to use the new xget... functions to avoid these issues. I've checked which call to the original get... functions could be left (reducing the scope of the structure if possible), and I've left comments to ease future reviews (e.g. /* local, no need for xgetpwnam */). Note: the getpwent/getgrent calls should probably be checked also. * src/groupdel.c, src/expiry.c: Fix typos in comments. * src/groupmod.c: Re-indent. * libmisc/Makefile.am, lib/groupmem.c, lib/groupio.c, lib/pwmem.c, lib/pwio.c, lib/shadowmem.c, lib/shadowio.c: Move the __<xx>_dup functions (used by the xget... functions) from the <xx>io.c files to the new <xx>mem.c files. This avoid linking some utils against the SELinux library.
2007-11-19 04:45:26 +05:30
if (retval == PAM_SUCCESS) {
retval = pam_start ("chpasswd", pampw->pw_name,
&conv, &pamh);
}
}
if (retval == PAM_SUCCESS) {
retval = pam_authenticate (pamh, 0);
if (retval != PAM_SUCCESS) {
pam_end (pamh, retval);
}
}
if (retval == PAM_SUCCESS) {
retval = pam_acct_mgmt (pamh, 0);
if (retval != PAM_SUCCESS) {
pam_end (pamh, retval);
}
}
if (retval != PAM_SUCCESS) {
fprintf (stderr, _("%s: PAM authentication failed\n"), Prog);
exit (1);
}
#endif /* USE_PAM */
/*
* Lock the group file and open it for reading. This will bring
* all of the entries into memory where they may be updated.
*/
if (!gr_lock ()) {
fprintf (stderr, _("%s: can't lock group file\n"), Prog);
exit (1);
}
if (!gr_open (O_RDWR)) {
fprintf (stderr, _("%s: can't open group file\n"), Prog);
gr_unlock ();
exit (1);
}
#ifdef SHADOWGRP
is_shadow_grp = sgr_file_present ();
if (is_shadow_grp) {
if (!sgr_lock ()) {
fprintf (stderr, _("%s: can't lock gshadow file\n"),
Prog);
gr_unlock ();
exit (1);
}
if (!sgr_open (O_RDWR)) {
fprintf (stderr, _("%s: can't open shadow file\n"),
Prog);
gr_unlock ();
sgr_unlock ();
exit (1);
}
}
#endif
/*
* Read each line, separating the group name from the password. The
* password entry for each group will be looked up in the appropriate
* file (gshadow or group) and the password changed.
*/
while (fgets (buf, sizeof buf, stdin) != (char *) 0) {
line++;
if ((cp = strrchr (buf, '\n'))) {
*cp = '\0';
} else {
fprintf (stderr, _("%s: line %d: line too long\n"),
Prog, line);
errors++;
continue;
}
/*
* The groupname is the first field. It is separated from the
* password with a ":" character which is replaced with a
* NUL to give the new password. The new password will then
* be encrypted in the normal fashion with a new salt
* generated, unless the '-e' is given, in which case it is
* assumed to already be encrypted.
*/
name = buf;
if ((cp = strchr (name, ':'))) {
*cp++ = '\0';
} else {
fprintf (stderr,
_("%s: line %d: missing new password\n"),
Prog, line);
errors++;
continue;
}
newpwd = cp;
if (!eflg) {
void *arg = NULL;
if (md5flg)
crypt_method = "MD5";
else if (crypt_method != NULL) {
if (sflg)
arg = &sha_rounds;
} else
crypt_method = "DES";
cp = pw_encrypt (newpwd,
crypt_make_salt(crypt_method, arg));
}
/*
* Get the password file entry for this user. The user must
* already exist.
*/
gr = gr_locate (name);
if (!gr) {
fprintf (stderr,
_("%s: line %d: unknown group %s\n"), Prog,
line, name);
errors++;
continue;
}
#ifdef SHADOWGRP
sg = sgr_locate (name);
#endif
/*
* The freshly encrypted new password is merged into the
* user's password file entry and the last password change
* date is set to the current date.
*/
#ifdef SHADOWGRP
newsg = *sg;
newsg.sg_passwd = cp;
#else
newgr = *gr;
newgr.gr_passwd = cp;
#endif
/*
* The updated password file entry is then put back and will
* be written to the password file later, after all the
* other entries have been updated as well.
*/
#ifdef SHADOWGRP
ok = sgr_update (&newsg);
#else
ok = gr_update (&newgr);
#endif
if (!ok) {
fprintf (stderr,
_
("%s: line %d: cannot update password entry\n"),
Prog, line);
errors++;
continue;
}
}
/*
* Any detected errors will cause the entire set of changes to be
* aborted. Unlocking the password 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 (errors) {
fprintf (stderr,
_("%s: error detected, changes ignored\n"), Prog);
#ifdef SHADOWGRP
if (is_shadow_grp)
sgr_unlock ();
#endif
gr_unlock ();
exit (1);
}
#ifdef SHADOWGRP
if (is_shadow_grp) {
if (!sgr_close ()) {
fprintf (stderr,
_("%s: error updating shadow file\n"), Prog);
gr_unlock ();
exit (1);
}
sgr_unlock ();
}
#endif
if (!gr_close ()) {
fprintf (stderr, _("%s: error updating password file\n"), Prog);
exit (1);
}
nscd_flush_cache ("group");
gr_unlock ();
#ifdef USE_PAM
if (retval == PAM_SUCCESS)
pam_end (pamh, PAM_SUCCESS);
#endif /* USE_PAM */
return (0);
}