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Diffstat (limited to '')
-rw-r--r-- | src/chgpasswd.c | 636 |
1 files changed, 636 insertions, 0 deletions
diff --git a/src/chgpasswd.c b/src/chgpasswd.c new file mode 100644 index 0000000..4013abb --- /dev/null +++ b/src/chgpasswd.c @@ -0,0 +1,636 @@ +/* + * Copyright (c) 1990 - 1994, Julianne Frances Haugh + * Copyright (c) 2006 , Tomasz Kłoczko + * Copyright (c) 2006 , Jonas Meurer + * Copyright (c) 2007 - 2011, 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 <config.h> + +#ident "$Id$" + +#include <fcntl.h> +#include <getopt.h> +#include <pwd.h> +#include <stdio.h> +#include <stdlib.h> +#ifdef ACCT_TOOLS_SETUID +#ifdef USE_PAM +#include "pam_defs.h" +#endif /* USE_PAM */ +#endif /* ACCT_TOOLS_SETUID */ +#include "defines.h" +#include "nscd.h" +#include "sssd.h" +#include "prototypes.h" +#include "groupio.h" +#ifdef SHADOWGRP +#include "sgroupio.h" +#endif +/*@-exitarg@*/ +#include "exitcodes.h" + +/* + * Global variables + */ +const char *Prog; +static bool eflg = false; +static bool md5flg = false; +#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) +static bool sflg = false; +#endif /* USE_SHA_CRYPT || USE_BCRYPT */ + +static /*@null@*//*@observer@*/const char *crypt_method = NULL; +#define cflg (NULL != crypt_method) +#ifdef USE_SHA_CRYPT +static long sha_rounds = 5000; +#endif +#ifdef USE_BCRYPT +static long bcrypt_rounds = 13; +#endif + +#ifdef SHADOWGRP +static bool is_shadow_grp; +static bool sgr_locked = false; +#endif +static bool gr_locked = false; + +/* local function prototypes */ +static void fail_exit (int code); +static /*@noreturn@*/void usage (int status); +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 (gr_locked) { + if (gr_unlock () == 0) { + fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ()); + SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ())); + /* continue */ + } + } + +#ifdef SHADOWGRP + if (sgr_locked) { + if (sgr_unlock () == 0) { + fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ()); + SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ())); + /* continue */ + } + } +#endif + + exit (code); +} + +/* + * usage - display usage message and exit + */ +static /*@noreturn@*/void usage (int status) +{ + FILE *usageout = (E_SUCCESS != status) ? stderr : stdout; + (void) fprintf (usageout, + _("Usage: %s [options]\n" + "\n" + "Options:\n"), + Prog); + (void) fprintf (usageout, + _(" -c, --crypt-method METHOD the crypt method (one of %s)\n"), +#if !defined(USE_SHA_CRYPT) && !defined(USE_BCRYPT) + "NONE DES MD5" +#elif defined(USE_SHA_CRYPT) && defined(USE_BCRYPT) + "NONE DES MD5 SHA256 SHA512 BCRYPT" +#elif defined(USE_SHA_CRYPT) + "NONE DES MD5 SHA256 SHA512" +#else + "NONE DES MD5 BCRYPT" +#endif + ); + (void) fputs (_(" -e, --encrypted supplied passwords are encrypted\n"), usageout); + (void) fputs (_(" -h, --help display this help message and exit\n"), usageout); + (void) fputs (_(" -m, --md5 encrypt the clear text password using\n" + " the MD5 algorithm\n"), + usageout); + (void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout); +#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) + (void) fputs (_(" -s, --sha-rounds number of rounds for the SHA or BCRYPT\n" + " crypt algorithms\n"), + usageout); +#endif /* USE_SHA_CRYPT || USE_BCRYPT */ + (void) fputs ("\n", usageout); + + exit (status); +} + +/* + * 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 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'}, + {"root", required_argument, NULL, 'R'}, +#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) + {"sha-rounds", required_argument, NULL, 's'}, +#endif /* USE_SHA_CRYPT || USE_BCRYPT */ + {NULL, 0, NULL, '\0'} + }; + while ((c = getopt_long (argc, argv, +#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) + "c:ehmR:s:", +#else + "c:ehmR:", +#endif + long_options, NULL)) != -1) { + switch (c) { + case 'c': + crypt_method = optarg; + break; + case 'e': + eflg = true; + break; + case 'h': + usage (E_SUCCESS); + /*@notreached@*/break; + case 'm': + md5flg = true; + break; + case 'R': /* no-op, handled in process_root_flag () */ + break; +#if defined(USE_SHA_CRYPT) && defined(USE_BCRYPT) + case 's': + sflg = true; + if ( ( ((0 == strcmp (crypt_method, "SHA256")) || (0 == strcmp (crypt_method, "SHA512"))) + && (0 == getlong(optarg, &sha_rounds))) + || ( (0 == strcmp (crypt_method, "BCRYPT")) + && (0 == getlong(optarg, &bcrypt_rounds)))) { + fprintf (stderr, + _("%s: invalid numeric argument '%s'\n"), + Prog, optarg); + usage (E_USAGE); + } + break; +#elif defined(USE_SHA_CRYPT) + case 's': + sflg = true; + if (0 == getlong(optarg, &sha_rounds)) { + fprintf (stderr, + _("%s: invalid numeric argument '%s'\n"), + Prog, optarg); + usage (E_USAGE); + } + break; +#elif defined(USE_BCRYPT) + case 's': + sflg = true; + if (0 == getlong(optarg, &bcrypt_rounds)) { + fprintf (stderr, + _("%s: invalid numeric argument '%s'\n"), + Prog, optarg); + usage (E_USAGE); + } + break; +#endif + + default: + usage (E_USAGE); + /*@notreached@*/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 defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) + if (sflg && !cflg) { + fprintf (stderr, + _("%s: %s flag is only allowed with the %s flag\n"), + Prog, "-s", "-c"); + usage (E_USAGE); + } +#endif + + if ((eflg && (md5flg || cflg)) || + (md5flg && cflg)) { + fprintf (stderr, + _("%s: the -c, -e, and -m flags are exclusive\n"), + Prog); + usage (E_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 +#ifdef USE_BCRYPT + && (0 != strcmp (crypt_method, "BCRYPT")) +#endif + ) { + fprintf (stderr, + _("%s: unsupported crypt method: %s\n"), + Prog, crypt_method); + usage (E_USAGE); + } + } +} + +/* + * check_perms - check if the caller is allowed to add a group + * + * With PAM support, the setuid bit can be set on chgpasswd 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) { + fprintf (stderr, + _("%s: Cannot determine your user name.\n"), + Prog); + exit (1); + } + + retval = pam_start ("chgpasswd", 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 (PAM_SUCCESS != retval) { + fprintf (stderr, _("%s: PAM: %s\n"), + Prog, pam_strerror (pamh, retval)); + SYSLOG((LOG_ERR, "%s", pam_strerror (pamh, retval))); + if (NULL != pamh) { + (void) pam_end (pamh, retval); + } + exit (1); + } + (void) pam_end (pamh, retval); +#endif /* USE_PAM */ +#endif /* ACCT_TOOLS_SETUID */ +} + +/* + * open_files - lock and open the group databases + */ +static void open_files (void) +{ + /* + * Lock the group file and open it for reading and writing. This will + * bring all of the entries into memory where they may be updated. + */ + if (gr_lock () == 0) { + fprintf (stderr, + _("%s: cannot lock %s; try again later.\n"), + Prog, gr_dbname ()); + fail_exit (1); + } + gr_locked = true; + if (gr_open (O_CREAT | O_RDWR) == 0) { + fprintf (stderr, + _("%s: cannot open %s\n"), Prog, gr_dbname ()); + fail_exit (1); + } + +#ifdef SHADOWGRP + /* Do the same for the shadowed database, if it exist */ + if (is_shadow_grp) { + if (sgr_lock () == 0) { + fprintf (stderr, + _("%s: cannot lock %s; try again later.\n"), + Prog, sgr_dbname ()); + fail_exit (1); + } + sgr_locked = true; + if (sgr_open (O_CREAT | O_RDWR) == 0) { + fprintf (stderr, _("%s: cannot open %s\n"), + Prog, sgr_dbname ()); + fail_exit (1); + } + } +#endif +} + +/* + * close_files - close and unlock the group databases + */ +static void close_files (void) +{ +#ifdef SHADOWGRP + if (is_shadow_grp) { + if (sgr_close () == 0) { + fprintf (stderr, + _("%s: failure while writing changes to %s\n"), + Prog, sgr_dbname ()); + SYSLOG ((LOG_ERR, "failure while writing changes to %s", sgr_dbname ())); + fail_exit (1); + } + if (sgr_unlock () == 0) { + fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ()); + SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ())); + /* continue */ + } + sgr_locked = false; + } +#endif + + if (gr_close () == 0) { + fprintf (stderr, + _("%s: failure while writing changes to %s\n"), + Prog, gr_dbname ()); + SYSLOG ((LOG_ERR, "failure while writing changes to %s", gr_dbname ())); + fail_exit (1); + } + if (gr_unlock () == 0) { + fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ()); + SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ())); + /* continue */ + } + gr_locked = false; +} + +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; + struct group newgr; + int errors = 0; + int line = 0; + + Prog = Basename (argv[0]); + + (void) setlocale (LC_ALL, ""); + (void) bindtextdomain (PACKAGE, LOCALEDIR); + (void) textdomain (PACKAGE); + + process_root_flag ("-R", argc, argv); + + process_flags (argc, argv); + + OPENLOG ("chgpasswd"); + + check_perms (); + +#ifdef SHADOWGRP + is_shadow_grp = sgr_file_present (); +#endif + + open_files (); + + /* + * Read each line, separating the group name from the password. The + * group entry for each group will be looked up in the appropriate + * file (gshadow or group) and the password changed. + */ + 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 group's name 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; + const char *salt; + if (md5flg) { + crypt_method = "MD5"; + } +#if defined(USE_SHA_CRYPT) && defined(USE_BCRYPT) + if (sflg) { + if ( (0 == strcmp (crypt_method, "SHA256")) + || (0 == strcmp (crypt_method, "SHA512"))) { + arg = &sha_rounds; + } + else if (0 == strcmp (crypt_method, "BCRYPT")) { + arg = &bcrypt_rounds; + } + } +#elif defined(USE_SHA_CRYPT) + if (sflg) { + arg = &sha_rounds; + } +#elif defined(USE_BCRYPT) + if (sflg) { + arg = &bcrypt_rounds; + } +#endif + salt = crypt_make_salt (crypt_method, arg); + cp = pw_encrypt (newpwd, salt); + if (NULL == cp) { + fprintf (stderr, + _("%s: failed to crypt password with salt '%s': %s\n"), + Prog, salt, strerror (errno)); + fail_exit (1); + } + } + + /* + * Get the group file entry for this group. The group must + * already exist. + */ + gr = gr_locate (name); + if (NULL == gr) { + fprintf (stderr, + _("%s: line %d: group '%s' does not exist\n"), Prog, + line, name); + errors++; + continue; + } +#ifdef SHADOWGRP + if (is_shadow_grp) { + /* The gshadow entry should be updated if the + * group entry has a password set to 'x'. + * But on the other hand, if there is already both + * a group and a gshadow password, it's preferable + * to update both. + */ + sg = sgr_locate (name); + + if ( (NULL == sg) + && (strcmp (gr->gr_passwd, + SHADOW_PASSWD_STRING) == 0)) { + static char *empty = NULL; + /* If the password is set to 'x' in + * group, but there are no entries in + * gshadow, create one. + */ + newsg.sg_name = name; + /* newsg.sg_passwd = NULL; will be set later */ + newsg.sg_adm = ∅ + newsg.sg_mem = dup_list (gr->gr_mem); + sg = &newsg; + } + } else { + sg = NULL; + } +#endif + + /* + * The freshly encrypted new password is merged into the + * group's entry. + */ +#ifdef SHADOWGRP + if (NULL != sg) { + newsg = *sg; + newsg.sg_passwd = cp; + } + if ( (NULL == sg) + || (strcmp (gr->gr_passwd, SHADOW_PASSWD_STRING) != 0)) +#endif + { + newgr = *gr; + newgr.gr_passwd = cp; + } + + /* + * The updated group file entry is then put back and will + * be written to the group file later, after all the + * other entries have been updated as well. + */ +#ifdef SHADOWGRP + if (NULL != sg) { + if (sgr_update (&newsg) == 0) { + fprintf (stderr, + _("%s: line %d: failed to prepare the new %s entry '%s'\n"), + Prog, line, sgr_dbname (), newsg.sg_name); + errors++; + continue; + } + } + if ( (NULL == sg) + || (strcmp (gr->gr_passwd, SHADOW_PASSWD_STRING) != 0)) +#endif + { + if (gr_update (&newgr) == 0) { + fprintf (stderr, + _("%s: line %d: failed to prepare the new %s entry '%s'\n"), + Prog, line, gr_dbname (), newgr.gr_name); + errors++; + continue; + } + } + } + + /* + * Any detected errors will cause the entire set of changes to be + * aborted. Unlocking the group 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 ("group"); + sssd_flush_cache (SSSD_DB_GROUP); + + return (0); +} + |