/* * Copyright (c) 1990 - 1994, Julianne Frances Haugh * Copyright (c) 1996 - 2000, Marek Michałkiewicz * Copyright (c) 2000 - 2006, Tomasz Kłoczko * Copyright (c) 2007 - 2008, Nicolas François * 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. The name of the copyright holders or contributors may not be used to * endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 THE COPYRIGHT * HOLDERS 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 #ident "$Id$" #include #include #include #include #include #ifdef ACCT_TOOLS_SETUID #ifdef USE_PAM #include "pam_defs.h" #endif /* USE_PAM */ #endif /* ACCT_TOOLS_SETUID */ #include "defines.h" #include "exitcodes.h" #include "nscd.h" #include "prototypes.h" #include "pwio.h" #include "shadowio.h" /* * Global variables */ char *Prog; static bool cflg = false; static bool eflg = false; static bool md5flg = false; static bool sflg = false; static const char *crypt_method = NULL; static long sha_rounds = 5000; static bool is_shadow_pwd; static bool pw_locked = false; static bool spw_locked = false; /* local function prototypes */ static void fail_exit (int code); static void usage (void); static void process_flags (int argc, char **argv); static void check_flags (void); static void check_perms (void); static void open_files (void); static void close_files (void); /* * fail_exit - exit with a failure code after unlocking the files */ static void fail_exit (int code) { if (pw_locked) { if (pw_unlock () == 0) { 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) { fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ()); SYSLOG ((LOG_ERR, "failed to unlock %s", spw_dbname ())); /* continue */ } } exit (code); } /* * usage - display usage message and exit */ static void usage (void) { fprintf (stderr, _("Usage: %s [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 encrypt the clear text password using\n" " the MD5 algorithm\n" "%s" "\n"), Prog, #ifndef USE_SHA_CRYPT "NONE DES MD5", "" #else "NONE DES MD5 SHA256 SHA512", _(" -s, --sha-rounds number of SHA rounds for the SHA*\n" " crypt algorithms\n") #endif ); exit (E_USAGE); } /* * process_flags - parse the command line options * * It will not return if an error is encountered. */ static void process_flags (int argc, char **argv) { 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'}, #ifdef USE_SHA_CRYPT {"sha-rounds", required_argument, NULL, 's'}, #endif {NULL, 0, NULL, '\0'} }; while ((c = getopt_long (argc, argv, #ifdef USE_SHA_CRYPT "c:ehms:", #else "c:ehm", #endif long_options, &option_index)) != -1) { switch (c) { case 'c': cflg = true; crypt_method = optarg; break; case 'e': eflg = true; break; case 'h': usage (); break; case 'm': md5flg = true; break; #ifdef USE_SHA_CRYPT case 's': sflg = true; if (getlong(optarg, &sha_rounds) == 0) { fprintf (stderr, _("%s: invalid numeric argument '%s'\n"), Prog, optarg); usage (); } break; #endif case 0: /* long option */ break; default: usage (); break; } } /* validate options */ check_flags (); } /* * check_flags - check flags and parameters consistency * * It will not return if an error is encountered. */ static void check_flags (void) { if (sflg && !cflg) { fprintf (stderr, _("%s: %s flag is only allowed with the %s flag\n"), Prog, "-s", "-c"); usage (); } if ((eflg && (md5flg || cflg)) || (md5flg && cflg)) { fprintf (stderr, _("%s: the -c, -e, and -m flags are exclusive\n"), Prog); usage (); } if (cflg) { if ( (0 != strcmp (crypt_method, "DES")) && (0 != strcmp (crypt_method, "MD5")) && (0 != strcmp (crypt_method, "NONE")) #ifdef USE_SHA_CRYPT && (0 != strcmp (crypt_method, "SHA256")) && (0 != strcmp (crypt_method, "SHA512")) #endif ) { fprintf (stderr, _("%s: unsupported crypt method: %s\n"), Prog, crypt_method); usage (); } } } /* * check_perms - check if the caller is allowed to add a group * * With PAM support, the setuid bit can be set on chpasswd to allow * non-root users to groups. * Without PAM support, only users who can write in the group databases * can add groups. * * It will not return if the user is not allowed. */ static void check_perms (void) { #ifdef ACCT_TOOLS_SETUID #ifdef USE_PAM pam_handle_t *pamh = NULL; int retval; struct passwd *pampw; pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */ if (NULL == pampw) { retval = PAM_USER_UNKNOWN; } else { retval = pam_start ("chpasswd", pampw->pw_name, &conv, &pamh); } if (PAM_SUCCESS == retval) { retval = pam_authenticate (pamh, 0); } if (PAM_SUCCESS == retval) { retval = pam_acct_mgmt (pamh, 0); } if (NULL != pamh) { (void) pam_end (pamh, retval); } if (PAM_SUCCESS != retval) { fprintf (stderr, _("%s: PAM authentication failed\n"), Prog); exit (1); } #endif /* USE_PAM */ #endif /* ACCT_TOOLS_SETUID */ } /* * open_files - lock and open the password databases */ static void open_files (void) { /* * Lock the password file and open it for reading and writing. This * will bring all of the entries into memory where they may be updated. */ if (pw_lock () == 0) { fprintf (stderr, _("%s: cannot lock %s; try again later.\n"), Prog, pw_dbname ()); fail_exit (1); } pw_locked = true; if (pw_open (O_RDWR) == 0) { fprintf (stderr, _("%s: cannot open %s\n"), Prog, pw_dbname ()); fail_exit (1); } /* Do the same for the shadowed database, if it exist */ if (is_shadow_pwd) { if (spw_lock () == 0) { fprintf (stderr, _("%s: cannot lock %s; try again later.\n"), Prog, spw_dbname ()); fail_exit (1); } spw_locked = true; if (spw_open (O_RDWR) == 0) { fprintf (stderr, _("%s: cannot open %s\n"), Prog, spw_dbname ()); fail_exit (1); } } } /* * close_files - close and unlock the password databases */ static void close_files (void) { if (is_shadow_pwd) { if (spw_close () == 0) { 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 (1); } if (spw_unlock () == 0) { fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ()); SYSLOG ((LOG_ERR, "failed to unlock %s", spw_dbname ())); /* continue */ } spw_locked = false; } if (pw_close () == 0) { 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 (1); } if (pw_unlock () == 0) { fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, pw_dbname ()); SYSLOG ((LOG_ERR, "failed to unlock %s", pw_dbname ())); /* continue */ } pw_locked = false; } int main (int argc, char **argv) { char buf[BUFSIZ]; char *name; char *newpwd; char *cp; const struct spwd *sp; struct spwd newsp; const struct passwd *pw; struct passwd newpw; int errors = 0; int line = 0; long now = (long) time ((time_t *)NULL) / SCALE; Prog = Basename (argv[0]); (void) setlocale (LC_ALL, ""); (void) bindtextdomain (PACKAGE, LOCALEDIR); (void) textdomain (PACKAGE); process_flags (argc, argv); OPENLOG ("chpasswd"); check_perms (); is_shadow_pwd = spw_file_present (); open_files (); /* * Read each line, separating the user name from the password. The * password entry for each user will be looked up in the appropriate * file (shadow or passwd) and the password changed. For shadow * files the last change date is set directly, for passwd files the * last change date is set in the age only if aging information is * present. */ while (fgets (buf, (int) sizeof buf, stdin) != (char *) 0) { line++; cp = strrchr (buf, '\n'); if (NULL != cp) { *cp = '\0'; } else { fprintf (stderr, _("%s: line %d: line too long\n"), Prog, line); errors++; continue; } /* * The username 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; cp = strchr (name, ':'); if (NULL != cp) { *cp = '\0'; cp++; } else { fprintf (stderr, _("%s: line %d: missing new password\n"), Prog, line); errors++; continue; } newpwd = cp; if (!eflg && (NULL == crypt_method || 0 != strcmp(crypt_method, "NONE"))) { void *arg = NULL; if (md5flg) { crypt_method = "MD5"; } else if (crypt_method != NULL) { if (sflg) { arg = &sha_rounds; } } else { crypt_method = NULL; } cp = pw_encrypt (newpwd, crypt_make_salt(crypt_method, arg)); } /* * Get the password file entry for this user. The user must * already exist. */ pw = pw_locate (name); if (NULL == pw) { fprintf (stderr, _("%s: line %d: user '%s' does not exist\n"), Prog, line, name); errors++; continue; } if (is_shadow_pwd) { sp = spw_locate (name); } else { sp = NULL; } /* * 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. */ if (NULL != sp) { newsp = *sp; newsp.sp_pwdp = cp; newsp.sp_lstchg = now; } else { newpw = *pw; newpw.pw_passwd = cp; } /* * 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. */ if (NULL != sp) { if (spw_update (&newsp) == 0) { fprintf (stderr, _("%s: line %d: failed to prepare the new %s entry '%s'\n"), Prog, line, spw_dbname (), newsp.sp_namp); errors++; continue; } } else { if (pw_update (&newpw) == 0) { fprintf (stderr, _("%s: line %d: failed to prepare the new %s entry '%s'\n"), Prog, line, pw_dbname (), newpw.pw_name); 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 (0 != errors) { fprintf (stderr, _("%s: error detected, changes ignored\n"), Prog); fail_exit (1); } close_files (); nscd_flush_cache ("passwd"); return (0); }