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.
1169 lines
32 KiB
C
1169 lines
32 KiB
C
/*
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* Copyright (c) 1989 - 1994, Julianne Frances Haugh
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* Copyright (c) 1996 - 2000, Marek Michałkiewicz
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* Copyright (c) 2001 - 2006, Tomasz Kłoczko
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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 <errno.h>
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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 <signal.h>
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#include <stdio.h>
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#include <sys/types.h>
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#ifdef WITH_SELINUX
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#include <selinux/selinux.h>
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#include <selinux/flask.h>
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#include <selinux/av_permissions.h>
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#include <selinux/context.h>
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#endif /* WITH_SELINUX */
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#include <time.h>
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#include "defines.h"
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#include "getdef.h"
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#include "nscd.h"
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#include "prototypes.h"
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#include "pwauth.h"
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#include "pwio.h"
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#include "shadowio.h"
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/*
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* exit status values
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*/
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/*@-exitarg@*/
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#define E_SUCCESS 0 /* success */
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#define E_NOPERM 1 /* permission denied */
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#define E_USAGE 2 /* invalid combination of options */
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#define E_FAILURE 3 /* unexpected failure, nothing done */
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#define E_MISSING 4 /* unexpected failure, passwd file missing */
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#define E_PWDBUSY 5 /* passwd file busy, try again later */
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#define E_BAD_ARG 6 /* invalid argument to option */
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/*
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* Global variables
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*/
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const char *Prog; /* Program name */
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static char *name; /* The name of user whose password is being changed */
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static char *myname; /* The current user's name */
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static bool amroot; /* The caller's real UID was 0 */
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static bool
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aflg = false, /* -a - show status for all users */
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dflg = false, /* -d - delete password */
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eflg = false, /* -e - force password change */
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iflg = false, /* -i - set inactive days */
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kflg = false, /* -k - change only if expired */
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lflg = false, /* -l - lock the user's password */
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nflg = false, /* -n - set minimum days */
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qflg = false, /* -q - quiet mode */
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Sflg = false, /* -S - show password status */
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uflg = false, /* -u - unlock the user's password */
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wflg = false, /* -w - set warning days */
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xflg = false; /* -x - set maximum days */
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/*
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* set to 1 if there are any flags which require root privileges,
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* and require username to be specified
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*/
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static bool anyflag = false;
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static long age_min = 0; /* Minimum days before change */
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static long age_max = 0; /* Maximum days until change */
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static long warn = 0; /* Warning days before change */
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static long inact = 0; /* Days without change before locked */
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#ifndef USE_PAM
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static bool do_update_age = false;
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#endif /* ! USE_PAM */
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static bool pw_locked = false;
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static bool spw_locked = false;
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#ifndef USE_PAM
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/*
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* Size of the biggest passwd:
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* $6$ 3
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* rounds= 7
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* 999999999 9
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* $ 1
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* salt 16
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* $ 1
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* SHA512 123
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* nul 1
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*
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* total 161
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*/
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static char crypt_passwd[256];
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static bool do_update_pwd = false;
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#endif /* !USE_PAM */
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/*
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* External identifiers
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*/
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/* local function prototypes */
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static /*@noreturn@*/void usage (int);
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#ifndef USE_PAM
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static bool reuse (const char *, const struct passwd *);
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static int new_password (const struct passwd *);
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static void check_password (const struct passwd *, const struct spwd *);
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#endif /* !USE_PAM */
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static /*@observer@*/const char *date_to_str (time_t);
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static /*@observer@*/const char *pw_status (const char *);
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static void print_status (const struct passwd *);
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static /*@noreturn@*/void fail_exit (int);
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static /*@noreturn@*/void oom (void);
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static char *update_crypt_pw (char *);
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static void update_noshadow (void);
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static void update_shadow (void);
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#ifdef WITH_SELINUX
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static int check_selinux_access (const char *changed_user,
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uid_t changed_uid,
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access_vector_t requested_access);
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#endif /* WITH_SELINUX */
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/*
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* usage - print command usage 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] [LOGIN]\n"
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"\n"
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"Options:\n"),
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Prog);
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(void) fputs (_(" -a, --all report password status on all accounts\n"), usageout);
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(void) fputs (_(" -d, --delete delete the password for the named account\n"), usageout);
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(void) fputs (_(" -e, --expire force expire the password for the named account\n"), usageout);
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(void) fputs (_(" -h, --help display this help message and exit\n"), usageout);
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(void) fputs (_(" -k, --keep-tokens change password only if expired\n"), usageout);
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(void) fputs (_(" -i, --inactive INACTIVE set password inactive after expiration\n"
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" to INACTIVE\n"), usageout);
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(void) fputs (_(" -l, --lock lock the password of the named account\n"), usageout);
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(void) fputs (_(" -n, --mindays MIN_DAYS set minimum number of days before password\n"
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" change to MIN_DAYS\n"), usageout);
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(void) fputs (_(" -q, --quiet quiet mode\n"), usageout);
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(void) fputs (_(" -r, --repository REPOSITORY change password in REPOSITORY repository\n"), usageout);
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(void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout);
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(void) fputs (_(" -S, --status report password status on the named account\n"), usageout);
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(void) fputs (_(" -u, --unlock unlock the password of the named account\n"), usageout);
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(void) fputs (_(" -w, --warndays WARN_DAYS set expiration warning days to WARN_DAYS\n"), usageout);
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(void) fputs (_(" -x, --maxdays MAX_DAYS set maximum number of days before password\n"
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" change to MAX_DAYS\n"), usageout);
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(void) fputs ("\n", usageout);
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exit (status);
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}
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#ifndef USE_PAM
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static bool reuse (const char *pass, const struct passwd *pw)
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{
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#ifdef HAVE_LIBCRACK_HIST
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const char *reason;
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#ifdef HAVE_LIBCRACK_PW
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const char *FascistHistoryPw (const char *, const struct passwd *);
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reason = FascistHistory (pass, pw);
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#else /* !HAVE_LIBCRACK_PW */
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const char *FascistHistory (const char *, int);
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reason = FascistHistory (pass, pw->pw_uid);
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#endif /* !HAVE_LIBCRACK_PW */
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if (NULL != reason) {
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(void) printf (_("Bad password: %s. "), reason);
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return true;
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}
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#endif /* HAVE_LIBCRACK_HIST */
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return false;
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}
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/*
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* new_password - validate old password and replace with new (both old and
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* new in global "char crypt_passwd[128]")
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*/
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static int new_password (const struct passwd *pw)
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{
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char *clear; /* Pointer to clear text */
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char *cipher; /* Pointer to cipher text */
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const char *salt; /* Pointer to new salt */
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char *cp; /* Pointer to getpass() response */
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char orig[200]; /* Original password */
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char pass[200]; /* New password */
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int i; /* Counter for retries */
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bool warned;
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int pass_max_len = -1;
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const char *method;
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#ifdef HAVE_LIBCRACK_HIST
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int HistUpdate (const char *, const char *);
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#endif /* HAVE_LIBCRACK_HIST */
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/*
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* Authenticate the user. The user will be prompted for their own
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* password.
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*/
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if (!amroot && ('\0' != crypt_passwd[0])) {
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clear = getpass (_("Old password: "));
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if (NULL == clear) {
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return -1;
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}
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cipher = pw_encrypt (clear, crypt_passwd);
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if (NULL == cipher) {
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strzero (clear);
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fprintf (stderr,
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_("%s: failed to crypt password with previous salt: %s\n"),
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Prog, strerror (errno));
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SYSLOG ((LOG_INFO,
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"Failed to crypt password with previous salt of user '%s'",
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pw->pw_name));
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return -1;
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}
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if (strcmp (cipher, crypt_passwd) != 0) {
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strzero (clear);
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strzero (cipher);
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SYSLOG ((LOG_WARN, "incorrect password for %s",
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pw->pw_name));
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(void) sleep (1);
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(void) fprintf (stderr,
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_("Incorrect password for %s.\n"),
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pw->pw_name);
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return -1;
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}
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STRFCPY (orig, clear);
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strzero (clear);
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strzero (cipher);
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} else {
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orig[0] = '\0';
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}
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/*
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* Get the new password. The user is prompted for the new password
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* and has five tries to get it right. The password will be tested
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* for strength, unless it is the root user. This provides an escape
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* for initial login passwords.
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*/
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method = getdef_str ("ENCRYPT_METHOD");
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if (NULL == method) {
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if (!getdef_bool ("MD5_CRYPT_ENAB")) {
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pass_max_len = getdef_num ("PASS_MAX_LEN", 8);
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}
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} else {
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if ( (strcmp (method, "MD5") == 0)
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#ifdef USE_SHA_CRYPT
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|| (strcmp (method, "SHA256") == 0)
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|| (strcmp (method, "SHA512") == 0)
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#endif /* USE_SHA_CRYPT */
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) {
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pass_max_len = -1;
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} else {
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pass_max_len = getdef_num ("PASS_MAX_LEN", 8);
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}
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}
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if (!qflg) {
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if (pass_max_len == -1) {
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(void) printf (_(
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"Enter the new password (minimum of %d characters)\n"
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"Please use a combination of upper and lower case letters and numbers.\n"),
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getdef_num ("PASS_MIN_LEN", 5));
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} else {
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(void) printf (_(
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"Enter the new password (minimum of %d, maximum of %d characters)\n"
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"Please use a combination of upper and lower case letters and numbers.\n"),
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getdef_num ("PASS_MIN_LEN", 5), pass_max_len);
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}
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}
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warned = false;
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for (i = getdef_num ("PASS_CHANGE_TRIES", 5); i > 0; i--) {
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cp = getpass (_("New password: "));
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if (NULL == cp) {
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memzero (orig, sizeof orig);
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return -1;
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}
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if (warned && (strcmp (pass, cp) != 0)) {
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warned = false;
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}
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STRFCPY (pass, cp);
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strzero (cp);
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if (!amroot && (!obscure (orig, pass, pw) || reuse (pass, pw))) {
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(void) puts (_("Try again."));
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continue;
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}
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|
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/*
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* If enabled, warn about weak passwords even if you are
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* root (enter this password again to use it anyway).
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* --marekm
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*/
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if (amroot && !warned && getdef_bool ("PASS_ALWAYS_WARN")
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&& (!obscure (orig, pass, pw) || reuse (pass, pw))) {
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(void) puts (_("\nWarning: weak password (enter it again to use it anyway)."));
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warned = true;
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continue;
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}
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cp = getpass (_("Re-enter new password: "));
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if (NULL == cp) {
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memzero (orig, sizeof orig);
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return -1;
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}
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if (strcmp (cp, pass) != 0) {
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(void) fputs (_("They don't match; try again.\n"), stderr);
|
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} else {
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strzero (cp);
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break;
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}
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}
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memzero (orig, sizeof orig);
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if (i == 0) {
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memzero (pass, sizeof pass);
|
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return -1;
|
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}
|
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|
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/*
|
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* Encrypt the password, then wipe the cleartext password.
|
|
*/
|
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salt = crypt_make_salt (NULL, NULL);
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cp = pw_encrypt (pass, salt);
|
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memzero (pass, sizeof pass);
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|
|
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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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return -1;
|
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}
|
|
|
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#ifdef HAVE_LIBCRACK_HIST
|
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HistUpdate (pw->pw_name, crypt_passwd);
|
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#endif /* HAVE_LIBCRACK_HIST */
|
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STRFCPY (crypt_passwd, cp);
|
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return 0;
|
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}
|
|
|
|
/*
|
|
* check_password - test a password to see if it can be changed
|
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*
|
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* check_password() sees if the invoker has permission to change the
|
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* password for the given user.
|
|
*/
|
|
static void check_password (const struct passwd *pw, const struct spwd *sp)
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{
|
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time_t now;
|
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int exp_status;
|
|
|
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exp_status = isexpired (pw, sp);
|
|
|
|
/*
|
|
* If not expired and the "change only if expired" option (idea from
|
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* PAM) was specified, do nothing. --marekm
|
|
*/
|
|
if (kflg && (0 == exp_status)) {
|
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exit (E_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* Root can change any password any time.
|
|
*/
|
|
if (amroot) {
|
|
return;
|
|
}
|
|
|
|
(void) time (&now);
|
|
|
|
/*
|
|
* Expired accounts cannot be changed ever. Passwords which are
|
|
* locked may not be changed. Passwords where min > max may not be
|
|
* changed. Passwords which have been inactive too long cannot be
|
|
* changed.
|
|
*/
|
|
if ( (sp->sp_pwdp[0] == '!')
|
|
|| (exp_status > 1)
|
|
|| ( (sp->sp_max >= 0)
|
|
&& (sp->sp_min > sp->sp_max))) {
|
|
(void) fprintf (stderr,
|
|
_("The password for %s cannot be changed.\n"),
|
|
sp->sp_namp);
|
|
SYSLOG ((LOG_WARN, "password locked for '%s'", sp->sp_namp));
|
|
closelog ();
|
|
exit (E_NOPERM);
|
|
}
|
|
|
|
/*
|
|
* Passwords may only be changed after sp_min time is up.
|
|
*/
|
|
if (sp->sp_lstchg > 0) {
|
|
time_t ok;
|
|
ok = (time_t) sp->sp_lstchg * SCALE;
|
|
if (sp->sp_min > 0) {
|
|
ok += (time_t) sp->sp_min * SCALE;
|
|
}
|
|
|
|
if (now < ok) {
|
|
(void) fprintf (stderr,
|
|
_("The password for %s cannot be changed yet.\n"),
|
|
pw->pw_name);
|
|
SYSLOG ((LOG_WARN, "now < minimum age for '%s'", pw->pw_name));
|
|
closelog ();
|
|
exit (E_NOPERM);
|
|
}
|
|
}
|
|
}
|
|
#endif /* !USE_PAM */
|
|
|
|
static /*@observer@*/const char *date_to_str (time_t t)
|
|
{
|
|
static char buf[80];
|
|
struct tm *tm;
|
|
|
|
tm = gmtime (&t);
|
|
#ifdef HAVE_STRFTIME
|
|
(void) strftime (buf, sizeof buf, "%m/%d/%Y", tm);
|
|
#else /* !HAVE_STRFTIME */
|
|
(void) snprintf (buf, sizeof buf, "%02d/%02d/%04d",
|
|
tm->tm_mon + 1, tm->tm_mday, tm->tm_year + 1900);
|
|
#endif /* !HAVE_STRFTIME */
|
|
return buf;
|
|
}
|
|
|
|
static /*@observer@*/const char *pw_status (const char *pass)
|
|
{
|
|
if (*pass == '*' || *pass == '!') {
|
|
return "L";
|
|
}
|
|
if (*pass == '\0') {
|
|
return "NP";
|
|
}
|
|
return "P";
|
|
}
|
|
|
|
/*
|
|
* print_status - print current password status
|
|
*/
|
|
static void print_status (const struct passwd *pw)
|
|
{
|
|
struct spwd *sp;
|
|
|
|
sp = getspnam (pw->pw_name); /* local, no need for xgetspnam */
|
|
if (NULL != sp) {
|
|
(void) printf ("%s %s %s %lld %lld %lld %lld\n",
|
|
pw->pw_name,
|
|
pw_status (sp->sp_pwdp),
|
|
date_to_str (sp->sp_lstchg * SCALE),
|
|
((long long)sp->sp_min * SCALE) / DAY,
|
|
((long long)sp->sp_max * SCALE) / DAY,
|
|
((long long)sp->sp_warn * SCALE) / DAY,
|
|
((long long)sp->sp_inact * SCALE) / DAY);
|
|
} else {
|
|
(void) printf ("%s %s\n",
|
|
pw->pw_name, pw_status (pw->pw_passwd));
|
|
}
|
|
}
|
|
|
|
|
|
static /*@noreturn@*/void fail_exit (int status)
|
|
{
|
|
if (pw_locked) {
|
|
if (pw_unlock () == 0) {
|
|
(void) fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, pw_dbname ());
|
|
SYSLOG ((LOG_ERR, "failed to unlock %s", pw_dbname ()));
|
|
/* continue */
|
|
}
|
|
}
|
|
|
|
if (spw_locked) {
|
|
if (spw_unlock () == 0) {
|
|
(void) fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ());
|
|
SYSLOG ((LOG_ERR, "failed to unlock %s", spw_dbname ()));
|
|
/* continue */
|
|
}
|
|
}
|
|
|
|
exit (status);
|
|
}
|
|
|
|
static /*@noreturn@*/void oom (void)
|
|
{
|
|
(void) fprintf (stderr, _("%s: out of memory\n"), Prog);
|
|
fail_exit (E_FAILURE);
|
|
}
|
|
|
|
static char *update_crypt_pw (char *cp)
|
|
{
|
|
#ifndef USE_PAM
|
|
if (do_update_pwd) {
|
|
cp = xstrdup (crypt_passwd);
|
|
}
|
|
#endif /* !USE_PAM */
|
|
|
|
if (dflg) {
|
|
*cp = '\0';
|
|
}
|
|
|
|
if (uflg && *cp == '!') {
|
|
if (cp[1] == '\0') {
|
|
(void) fprintf (stderr,
|
|
_("%s: unlocking the password would result in a passwordless account.\n"
|
|
"You should set a password with usermod -p to unlock the password of this account.\n"),
|
|
Prog);
|
|
fail_exit (E_FAILURE);
|
|
} else {
|
|
cp++;
|
|
}
|
|
}
|
|
|
|
if (lflg && *cp != '!') {
|
|
char *newpw = xmalloc (strlen (cp) + 2);
|
|
|
|
strcpy (newpw, "!");
|
|
strcat (newpw, cp);
|
|
cp = newpw;
|
|
}
|
|
return cp;
|
|
}
|
|
|
|
|
|
static void update_noshadow (void)
|
|
{
|
|
const struct passwd *pw;
|
|
struct passwd *npw;
|
|
|
|
if (pw_lock () == 0) {
|
|
(void) fprintf (stderr,
|
|
_("%s: cannot lock %s; try again later.\n"),
|
|
Prog, pw_dbname ());
|
|
exit (E_PWDBUSY);
|
|
}
|
|
pw_locked = true;
|
|
if (pw_open (O_CREAT | O_RDWR) == 0) {
|
|
(void) fprintf (stderr,
|
|
_("%s: cannot open %s\n"),
|
|
Prog, pw_dbname ());
|
|
SYSLOG ((LOG_WARN, "cannot open %s", pw_dbname ()));
|
|
fail_exit (E_MISSING);
|
|
}
|
|
pw = pw_locate (name);
|
|
if (NULL == pw) {
|
|
(void) fprintf (stderr,
|
|
_("%s: user '%s' does not exist in %s\n"),
|
|
Prog, name, pw_dbname ());
|
|
fail_exit (E_NOPERM);
|
|
}
|
|
npw = __pw_dup (pw);
|
|
if (NULL == npw) {
|
|
oom ();
|
|
}
|
|
npw->pw_passwd = update_crypt_pw (npw->pw_passwd);
|
|
if (pw_update (npw) == 0) {
|
|
(void) fprintf (stderr,
|
|
_("%s: failed to prepare the new %s entry '%s'\n"),
|
|
Prog, pw_dbname (), npw->pw_name);
|
|
fail_exit (E_FAILURE);
|
|
}
|
|
if (pw_close () == 0) {
|
|
(void) fprintf (stderr,
|
|
_("%s: failure while writing changes to %s\n"),
|
|
Prog, pw_dbname ());
|
|
SYSLOG ((LOG_ERR, "failure while writing changes to %s", pw_dbname ()));
|
|
fail_exit (E_FAILURE);
|
|
}
|
|
if (pw_unlock () == 0) {
|
|
(void) fprintf (stderr,
|
|
_("%s: failed to unlock %s\n"),
|
|
Prog, pw_dbname ());
|
|
SYSLOG ((LOG_ERR, "failed to unlock %s", pw_dbname ()));
|
|
/* continue */
|
|
}
|
|
pw_locked = false;
|
|
}
|
|
|
|
static void update_shadow (void)
|
|
{
|
|
const struct spwd *sp;
|
|
struct spwd *nsp;
|
|
|
|
if (spw_lock () == 0) {
|
|
(void) fprintf (stderr,
|
|
_("%s: cannot lock %s; try again later.\n"),
|
|
Prog, spw_dbname ());
|
|
exit (E_PWDBUSY);
|
|
}
|
|
spw_locked = true;
|
|
if (spw_open (O_CREAT | O_RDWR) == 0) {
|
|
(void) fprintf (stderr,
|
|
_("%s: cannot open %s\n"),
|
|
Prog, spw_dbname ());
|
|
SYSLOG ((LOG_WARN, "cannot open %s", spw_dbname ()));
|
|
fail_exit (E_FAILURE);
|
|
}
|
|
sp = spw_locate (name);
|
|
if (NULL == sp) {
|
|
/* Try to update the password in /etc/passwd instead. */
|
|
(void) spw_close ();
|
|
update_noshadow ();
|
|
if (spw_unlock () == 0) {
|
|
(void) fprintf (stderr,
|
|
_("%s: failed to unlock %s\n"),
|
|
Prog, spw_dbname ());
|
|
SYSLOG ((LOG_ERR, "failed to unlock %s", spw_dbname ()));
|
|
/* continue */
|
|
}
|
|
spw_locked = false;
|
|
return;
|
|
}
|
|
nsp = __spw_dup (sp);
|
|
if (NULL == nsp) {
|
|
oom ();
|
|
}
|
|
nsp->sp_pwdp = update_crypt_pw (nsp->sp_pwdp);
|
|
if (xflg) {
|
|
nsp->sp_max = (age_max * DAY) / SCALE;
|
|
}
|
|
if (nflg) {
|
|
nsp->sp_min = (age_min * DAY) / SCALE;
|
|
}
|
|
if (wflg) {
|
|
nsp->sp_warn = (warn * DAY) / SCALE;
|
|
}
|
|
if (iflg) {
|
|
nsp->sp_inact = (inact * DAY) / SCALE;
|
|
}
|
|
#ifndef USE_PAM
|
|
if (do_update_age) {
|
|
nsp->sp_lstchg = (long) time ((time_t *) 0) / SCALE;
|
|
if (0 == nsp->sp_lstchg) {
|
|
/* Better disable aging than requiring a password
|
|
* change */
|
|
nsp->sp_lstchg = -1;
|
|
}
|
|
}
|
|
#endif /* !USE_PAM */
|
|
|
|
/*
|
|
* Force change on next login, like SunOS 4.x passwd -e or Solaris
|
|
* 2.x passwd -f. Solaris 2.x seems to do the same thing (set
|
|
* sp_lstchg to 0).
|
|
*/
|
|
if (eflg) {
|
|
nsp->sp_lstchg = 0;
|
|
}
|
|
|
|
if (spw_update (nsp) == 0) {
|
|
(void) fprintf (stderr,
|
|
_("%s: failed to prepare the new %s entry '%s'\n"),
|
|
Prog, spw_dbname (), nsp->sp_namp);
|
|
fail_exit (E_FAILURE);
|
|
}
|
|
if (spw_close () == 0) {
|
|
(void) fprintf (stderr,
|
|
_("%s: failure while writing changes to %s\n"),
|
|
Prog, spw_dbname ());
|
|
SYSLOG ((LOG_ERR, "failure while writing changes to %s", spw_dbname ()));
|
|
fail_exit (E_FAILURE);
|
|
}
|
|
if (spw_unlock () == 0) {
|
|
(void) fprintf (stderr,
|
|
_("%s: failed to unlock %s\n"),
|
|
Prog, spw_dbname ());
|
|
SYSLOG ((LOG_ERR, "failed to unlock %s", spw_dbname ()));
|
|
/* continue */
|
|
}
|
|
spw_locked = false;
|
|
}
|
|
|
|
#ifdef WITH_SELINUX
|
|
static int check_selinux_access (const char *changed_user,
|
|
uid_t changed_uid,
|
|
access_vector_t requested_access)
|
|
{
|
|
int status = -1;
|
|
security_context_t user_context;
|
|
context_t c;
|
|
const char *user;
|
|
|
|
/* if in permissive mode then allow the operation */
|
|
if (security_getenforce() == 0) {
|
|
return 0;
|
|
}
|
|
|
|
/* get the context of the process which executed passwd */
|
|
if (getprevcon(&user_context) != 0) {
|
|
return -1;
|
|
}
|
|
|
|
/* get the "user" portion of the context (the part before the first
|
|
colon) */
|
|
c = context_new(user_context);
|
|
user = context_user_get(c);
|
|
|
|
/* if changing a password for an account with UID==0 or for an account
|
|
where the identity matches then return success */
|
|
if (changed_uid != 0 && strcmp(changed_user, user) == 0) {
|
|
status = 0;
|
|
} else {
|
|
struct av_decision avd;
|
|
int retval;
|
|
retval = security_compute_av(user_context,
|
|
user_context,
|
|
SECCLASS_PASSWD,
|
|
requested_access,
|
|
&avd);
|
|
if ((retval == 0) &&
|
|
((requested_access & avd.allowed) == requested_access)) {
|
|
status = 0;
|
|
}
|
|
}
|
|
context_free(c);
|
|
freecon(user_context);
|
|
return status;
|
|
}
|
|
|
|
#endif /* WITH_SELINUX */
|
|
|
|
/*
|
|
* passwd - change a user's password file information
|
|
*
|
|
* This command controls the password file and commands which are used
|
|
* to modify it.
|
|
*
|
|
* The valid options are
|
|
*
|
|
* -d delete the password for the named account (*)
|
|
* -e expire the password for the named account (*)
|
|
* -f execute chfn command to interpret flags
|
|
* -g execute gpasswd command to interpret flags
|
|
* -i # set sp_inact to # days (*)
|
|
* -k change password only if expired
|
|
* -l lock the password of the named account (*)
|
|
* -n # set sp_min to # days (*)
|
|
* -r # change password in # repository
|
|
* -s execute chsh command to interpret flags
|
|
* -S show password status of named account
|
|
* -u unlock the password of the named account (*)
|
|
* -w # set sp_warn to # days (*)
|
|
* -x # set sp_max to # days (*)
|
|
*
|
|
* (*) requires root permission to execute.
|
|
*
|
|
* All of the time fields are entered in days and converted to the
|
|
* appropriate internal format. For finer resolute the chage
|
|
* command must be used.
|
|
*/
|
|
int main (int argc, char **argv)
|
|
{
|
|
const struct passwd *pw; /* Password file entry for user */
|
|
|
|
#ifndef USE_PAM
|
|
char *cp; /* Miscellaneous character pointing */
|
|
|
|
const struct spwd *sp; /* Shadow file entry for user */
|
|
#endif /* !USE_PAM */
|
|
|
|
sanitize_env ();
|
|
|
|
/*
|
|
* Get the program name. The program name is used as a prefix to
|
|
* most error messages.
|
|
*/
|
|
Prog = Basename (argv[0]);
|
|
|
|
(void) setlocale (LC_ALL, "");
|
|
(void) bindtextdomain (PACKAGE, LOCALEDIR);
|
|
(void) textdomain (PACKAGE);
|
|
|
|
process_root_flag ("-R", argc, argv);
|
|
|
|
/*
|
|
* The program behaves differently when executed by root than when
|
|
* executed by a normal user.
|
|
*/
|
|
amroot = (getuid () == 0);
|
|
|
|
OPENLOG ("passwd");
|
|
|
|
{
|
|
/*
|
|
* Parse the command line options.
|
|
*/
|
|
int c;
|
|
static struct option long_options[] = {
|
|
{"all", no_argument, NULL, 'a'},
|
|
{"delete", no_argument, NULL, 'd'},
|
|
{"expire", no_argument, NULL, 'e'},
|
|
{"help", no_argument, NULL, 'h'},
|
|
{"inactive", required_argument, NULL, 'i'},
|
|
{"keep-tokens", no_argument, NULL, 'k'},
|
|
{"lock", no_argument, NULL, 'l'},
|
|
{"mindays", required_argument, NULL, 'n'},
|
|
{"quiet", no_argument, NULL, 'q'},
|
|
{"repository", required_argument, NULL, 'r'},
|
|
{"root", required_argument, NULL, 'R'},
|
|
{"status", no_argument, NULL, 'S'},
|
|
{"unlock", no_argument, NULL, 'u'},
|
|
{"warndays", required_argument, NULL, 'w'},
|
|
{"maxdays", required_argument, NULL, 'x'},
|
|
{NULL, 0, NULL, '\0'}
|
|
};
|
|
|
|
while ((c = getopt_long (argc, argv, "adehi:kln:qr:R:Suw:x:",
|
|
long_options, NULL)) != -1) {
|
|
switch (c) {
|
|
case 'a':
|
|
aflg = true;
|
|
break;
|
|
case 'd':
|
|
dflg = true;
|
|
anyflag = true;
|
|
break;
|
|
case 'e':
|
|
eflg = true;
|
|
anyflag = true;
|
|
break;
|
|
case 'h':
|
|
usage (E_SUCCESS);
|
|
/*@notreached@*/break;
|
|
case 'i':
|
|
if ( (getlong (optarg, &inact) == 0)
|
|
|| (inact < -1)) {
|
|
fprintf (stderr,
|
|
_("%s: invalid numeric argument '%s'\n"),
|
|
Prog, optarg);
|
|
usage (E_BAD_ARG);
|
|
}
|
|
iflg = true;
|
|
anyflag = true;
|
|
break;
|
|
case 'k':
|
|
/* change only if expired, like Linux-PAM passwd -k. */
|
|
kflg = true; /* ok for users */
|
|
break;
|
|
case 'l':
|
|
lflg = true;
|
|
anyflag = true;
|
|
break;
|
|
case 'n':
|
|
if ( (getlong (optarg, &age_min) == 0)
|
|
|| (age_min < -1)) {
|
|
fprintf (stderr,
|
|
_("%s: invalid numeric argument '%s'\n"),
|
|
Prog, optarg);
|
|
usage (E_BAD_ARG);
|
|
}
|
|
nflg = true;
|
|
anyflag = true;
|
|
break;
|
|
case 'q':
|
|
qflg = true; /* ok for users */
|
|
break;
|
|
case 'r':
|
|
/* -r repository (files|nis|nisplus) */
|
|
/* only "files" supported for now */
|
|
if (strcmp (optarg, "files") != 0) {
|
|
fprintf (stderr,
|
|
_("%s: repository %s not supported\n"),
|
|
Prog, optarg);
|
|
exit (E_BAD_ARG);
|
|
}
|
|
break;
|
|
case 'R': /* no-op, handled in process_root_flag () */
|
|
break;
|
|
case 'S':
|
|
Sflg = true; /* ok for users */
|
|
break;
|
|
case 'u':
|
|
uflg = true;
|
|
anyflag = true;
|
|
break;
|
|
case 'w':
|
|
if ( (getlong (optarg, &warn) == 0)
|
|
|| (warn < -1)) {
|
|
(void) fprintf (stderr,
|
|
_("%s: invalid numeric argument '%s'\n"),
|
|
Prog, optarg);
|
|
usage (E_BAD_ARG);
|
|
}
|
|
wflg = true;
|
|
anyflag = true;
|
|
break;
|
|
case 'x':
|
|
if ( (getlong (optarg, &age_max) == 0)
|
|
|| (age_max < -1)) {
|
|
(void) fprintf (stderr,
|
|
_("%s: invalid numeric argument '%s'\n"),
|
|
Prog, optarg);
|
|
usage (E_BAD_ARG);
|
|
}
|
|
xflg = true;
|
|
anyflag = true;
|
|
break;
|
|
default:
|
|
usage (E_BAD_ARG);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now I have to get the user name. The name will be gotten from the
|
|
* command line if possible. Otherwise it is figured out from the
|
|
* environment.
|
|
*/
|
|
pw = get_my_pwent ();
|
|
if (NULL == pw) {
|
|
(void) fprintf (stderr,
|
|
_("%s: Cannot determine your user name.\n"),
|
|
Prog);
|
|
SYSLOG ((LOG_WARN, "Cannot determine the user name of the caller (UID %lu)",
|
|
(unsigned long) getuid ()));
|
|
exit (E_NOPERM);
|
|
}
|
|
myname = xstrdup (pw->pw_name);
|
|
if (optind < argc) {
|
|
name = argv[optind];
|
|
} else {
|
|
name = myname;
|
|
}
|
|
|
|
/*
|
|
* Make sure that at most one username was specified.
|
|
*/
|
|
if (argc > (optind+1)) {
|
|
usage (E_USAGE);
|
|
}
|
|
|
|
/*
|
|
* The -a flag requires -S, no other flags, no username, and
|
|
* you must be root. --marekm
|
|
*/
|
|
if (aflg) {
|
|
if (anyflag || !Sflg || (optind < argc)) {
|
|
usage (E_USAGE);
|
|
}
|
|
if (!amroot) {
|
|
(void) fprintf (stderr,
|
|
_("%s: Permission denied.\n"),
|
|
Prog);
|
|
exit (E_NOPERM);
|
|
}
|
|
setpwent ();
|
|
while ( (pw = getpwent ()) != NULL ) {
|
|
print_status (pw);
|
|
}
|
|
endpwent ();
|
|
exit (E_SUCCESS);
|
|
}
|
|
#if 0
|
|
/*
|
|
* Allow certain users (administrators) to change passwords of
|
|
* certain users. Not implemented yet. --marekm
|
|
*/
|
|
if (may_change_passwd (myname, name))
|
|
amroot = 1;
|
|
#endif
|
|
|
|
/*
|
|
* If any of the flags were given, a user name must be supplied on
|
|
* the command line. Only an unadorned command line doesn't require
|
|
* the user's name be given. Also, -x, -n, -w, -i, -e, -d,
|
|
* -l, -u may appear with each other. -S, -k must appear alone.
|
|
*/
|
|
|
|
/*
|
|
* -S now ok for normal users (check status of my own account), and
|
|
* doesn't require username. --marekm
|
|
*/
|
|
if (anyflag && optind >= argc) {
|
|
usage (E_USAGE);
|
|
}
|
|
|
|
if ( (Sflg && kflg)
|
|
|| (anyflag && (Sflg || kflg))) {
|
|
usage (E_USAGE);
|
|
}
|
|
|
|
if (anyflag && !amroot) {
|
|
(void) fprintf (stderr, _("%s: Permission denied.\n"), Prog);
|
|
exit (E_NOPERM);
|
|
}
|
|
|
|
pw = xgetpwnam (name);
|
|
if (NULL == pw) {
|
|
(void) fprintf (stderr,
|
|
_("%s: user '%s' does not exist\n"),
|
|
Prog, name);
|
|
exit (E_NOPERM);
|
|
}
|
|
#ifdef WITH_SELINUX
|
|
/* only do this check when getuid()==0 because it's a pre-condition for
|
|
changing a password without entering the old one */
|
|
if ((is_selinux_enabled() > 0) && (getuid() == 0) &&
|
|
(check_selinux_access (name, pw->pw_uid, PASSWD__PASSWD) != 0)) {
|
|
security_context_t user_context = NULL;
|
|
const char *user = "Unknown user context";
|
|
if (getprevcon (&user_context) == 0) {
|
|
user = user_context; /* FIXME: use context_user_get? */
|
|
}
|
|
SYSLOG ((LOG_ALERT,
|
|
"%s is not authorized to change the password of %s",
|
|
user, name));
|
|
(void) fprintf(stderr,
|
|
_("%s: %s is not authorized to change the password of %s\n"),
|
|
Prog, user, name);
|
|
if (NULL != user_context) {
|
|
freecon (user_context);
|
|
}
|
|
exit (E_NOPERM);
|
|
}
|
|
#endif /* WITH_SELINUX */
|
|
|
|
/*
|
|
* If the UID of the user does not match the current real UID,
|
|
* check if I'm root.
|
|
*/
|
|
if (!amroot && (pw->pw_uid != getuid ())) {
|
|
(void) fprintf (stderr,
|
|
_("%s: You may not view or modify password information for %s.\n"),
|
|
Prog, name);
|
|
SYSLOG ((LOG_WARN,
|
|
"%s: can't view or modify password information for %s",
|
|
Prog, name));
|
|
closelog ();
|
|
exit (E_NOPERM);
|
|
}
|
|
|
|
if (Sflg) {
|
|
print_status (pw);
|
|
exit (E_SUCCESS);
|
|
}
|
|
#ifndef USE_PAM
|
|
/*
|
|
* The user name is valid, so let's get the shadow file entry.
|
|
*/
|
|
sp = getspnam (name); /* !USE_PAM, no need for xgetspnam */
|
|
if (NULL == sp) {
|
|
if (errno == EACCES) {
|
|
(void) fprintf (stderr,
|
|
_("%s: Permission denied.\n"),
|
|
Prog);
|
|
exit (E_NOPERM);
|
|
}
|
|
sp = pwd_to_spwd (pw);
|
|
}
|
|
|
|
cp = sp->sp_pwdp;
|
|
|
|
/*
|
|
* If there are no other flags, just change the password.
|
|
*/
|
|
if (!anyflag) {
|
|
STRFCPY (crypt_passwd, cp);
|
|
|
|
/*
|
|
* See if the user is permitted to change the password.
|
|
* Otherwise, go ahead and set a new password.
|
|
*/
|
|
check_password (pw, sp);
|
|
|
|
/*
|
|
* Let the user know whose password is being changed.
|
|
*/
|
|
if (!qflg) {
|
|
(void) printf (_("Changing password for %s\n"), name);
|
|
}
|
|
|
|
if (new_password (pw) != 0) {
|
|
(void) fprintf (stderr,
|
|
_("The password for %s is unchanged.\n"),
|
|
name);
|
|
closelog ();
|
|
exit (E_NOPERM);
|
|
}
|
|
do_update_pwd = true;
|
|
do_update_age = true;
|
|
}
|
|
#endif /* !USE_PAM */
|
|
/*
|
|
* Before going any further, raise the ulimit to prevent colliding
|
|
* into a lowered ulimit, and set the real UID to root to protect
|
|
* against unexpected signals. Any keyboard signals are set to be
|
|
* ignored.
|
|
*/
|
|
pwd_init ();
|
|
|
|
#ifdef USE_PAM
|
|
/*
|
|
* Don't set the real UID for PAM...
|
|
*/
|
|
if (!anyflag) {
|
|
do_pam_passwd (name, qflg, kflg);
|
|
exit (E_SUCCESS);
|
|
}
|
|
#endif /* USE_PAM */
|
|
if (setuid (0) != 0) {
|
|
(void) fputs (_("Cannot change ID to root.\n"), stderr);
|
|
SYSLOG ((LOG_ERR, "can't setuid(0)"));
|
|
closelog ();
|
|
exit (E_NOPERM);
|
|
}
|
|
if (spw_file_present ()) {
|
|
update_shadow ();
|
|
} else {
|
|
update_noshadow ();
|
|
}
|
|
|
|
nscd_flush_cache ("passwd");
|
|
nscd_flush_cache ("group");
|
|
|
|
SYSLOG ((LOG_INFO, "password for '%s' changed by '%s'", name, myname));
|
|
closelog ();
|
|
if (!qflg) {
|
|
if (!anyflag) {
|
|
#ifndef USE_PAM
|
|
(void) printf (_("%s: password changed.\n"), Prog);
|
|
#endif /* USE_PAM */
|
|
} else {
|
|
(void) printf (_("%s: password expiry information changed.\n"), Prog);
|
|
}
|
|
}
|
|
|
|
return E_SUCCESS;
|
|
}
|
|
|