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Diffstat (limited to '')
| -rw-r--r-- | src/pwck.c | 912 |
1 files changed, 912 insertions, 0 deletions
diff --git a/src/pwck.c b/src/pwck.c new file mode 100644 index 0000000..be404c3 --- /dev/null +++ b/src/pwck.c @@ -0,0 +1,912 @@ +/* + * Copyright (c) 1992 - 1994, Julianne Frances Haugh + * Copyright (c) 1996 - 2000, Marek Michałkiewicz + * Copyright (c) 2001 , Michał Moskal + * Copyright (c) 2001 - 2006, Tomasz Kłoczko + * 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 <grp.h> +#include <pwd.h> +#include <stdio.h> +#include <getopt.h> +#include "chkname.h" +#include "commonio.h" +#include "defines.h" +#include "prototypes.h" +#include "pwio.h" +#include "shadowio.h" +#include "getdef.h" +#include "nscd.h" +#include "sssd.h" +#ifdef WITH_TCB +#include "tcbfuncs.h" +#endif /* WITH_TCB */ + +/* + * Exit codes + */ +/*@-exitarg@*/ +#define E_OKAY 0 +#define E_SUCCESS 0 +#define E_USAGE 1 +#define E_BADENTRY 2 +#define E_CANTOPEN 3 +#define E_CANTLOCK 4 +#define E_CANTUPDATE 5 +#define E_CANTSORT 6 + +/* + * Global variables + */ +const char *Prog; + +static bool use_system_pw_file = true; +static bool use_system_spw_file = true; + +static bool is_shadow = false; + +static bool spw_opened = false; + +static bool pw_locked = false; +static bool spw_locked = false; + +/* Options */ +static bool read_only = false; +static bool sort_mode = false; +static bool quiet = false; /* don't report warnings, only errors */ + +/* 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 open_files (void); +static void close_files (bool changed); +static void check_pw_file (int *errors, bool *changed); +static void check_spw_file (int *errors, bool *changed); + +extern int allow_bad_names; + +/* + * fail_exit - do some cleanup and exit with the given error code + */ +static void fail_exit (int code) +{ + if (spw_locked) { + if (spw_unlock () == 0) { + fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ()); + if (use_system_spw_file) { + SYSLOG ((LOG_ERR, "failed to unlock %s", + spw_dbname ())); + } + /* continue */ + } + } + + if (pw_locked) { + if (pw_unlock () == 0) { + fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, pw_dbname ()); + if (use_system_pw_file) { + SYSLOG ((LOG_ERR, "failed to unlock %s", + pw_dbname ())); + } + /* continue */ + } + } + + closelog (); + + exit (code); +} +/* + * usage - print syntax message and exit + */ +static /*@noreturn@*/void usage (int status) +{ + FILE *usageout = (E_SUCCESS != status) ? stderr : stdout; +#ifdef WITH_TCB + if (getdef_bool ("USE_TCB")) { + (void) fprintf (usageout, + _("Usage: %s [options] [passwd]\n" + "\n" + "Options:\n"), + Prog); + } else +#endif /* WITH_TCB */ + { + (void) fprintf (usageout, + _("Usage: %s [options] [passwd [shadow]]\n" + "\n" + "Options:\n"), + Prog); + } + (void) fputs (_(" -b, --badnames allow bad names\n"), usageout); + (void) fputs (_(" -h, --help display this help message and exit\n"), usageout); + (void) fputs (_(" -q, --quiet report errors only\n"), usageout); + (void) fputs (_(" -r, --read-only display errors and warnings\n" + " but do not change files\n"), usageout); + (void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout); +#ifdef WITH_TCB + if (!getdef_bool ("USE_TCB")) +#endif /* !WITH_TCB */ + { + (void) fputs (_(" -s, --sort sort entries by UID\n"), usageout); + } + (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[] = { + {"badnames", no_argument, NULL, 'b'}, + {"help", no_argument, NULL, 'h'}, + {"quiet", no_argument, NULL, 'q'}, + {"read-only", no_argument, NULL, 'r'}, + {"root", required_argument, NULL, 'R'}, + {"sort", no_argument, NULL, 's'}, + {NULL, 0, NULL, '\0'} + }; + + /* + * Parse the command line arguments + */ + while ((c = getopt_long (argc, argv, "behqrR:s", + long_options, NULL)) != -1) { + switch (c) { + case 'b': + allow_bad_names = true; + break; + case 'h': + usage (E_SUCCESS); + /*@notreached@*/break; + case 'e': /* added for Debian shadow-961025-2 compatibility */ + case 'q': + quiet = true; + break; + case 'r': + read_only = true; + break; + case 'R': /* no-op, handled in process_root_flag () */ + break; + case 's': + sort_mode = true; + break; + default: + usage (E_USAGE); + } + } + + if (sort_mode && read_only) { + fprintf (stderr, _("%s: -s and -r are incompatible\n"), Prog); + exit (E_USAGE); + } + + /* + * Make certain we have the right number of arguments + */ + if (argc > (optind + 2)) { + usage (E_USAGE); + } + + /* + * If there are two left over filenames, use those as the password + * and shadow password filenames. + */ + if (optind != argc) { + pw_setdbname (argv[optind]); + use_system_pw_file = false; + } + if ((optind + 2) == argc) { +#ifdef WITH_TCB + if (getdef_bool ("USE_TCB")) { + fprintf (stderr, + _("%s: no alternative shadow file allowed when USE_TCB is enabled.\n"), + Prog); + usage (E_USAGE); + } +#endif /* WITH_TCB */ + spw_setdbname (argv[optind + 1]); + is_shadow = true; + use_system_spw_file = false; + } else if (optind == argc) { + is_shadow = spw_file_present (); + } +} + +/* + * open_files - open the shadow database + * + * In read-only mode, the databases are not locked and are opened + * only for reading. + */ +static void open_files (void) +{ + bool use_tcb = false; +#ifdef WITH_TCB + use_tcb = getdef_bool ("USE_TCB"); +#endif /* WITH_TCB */ + + /* + * Lock the files if we aren't in "read-only" mode + */ + if (!read_only) { + if (pw_lock () == 0) { + fprintf (stderr, + _("%s: cannot lock %s; try again later.\n"), + Prog, pw_dbname ()); + fail_exit (E_CANTLOCK); + } + pw_locked = true; + if (is_shadow && !use_tcb) { + if (spw_lock () == 0) { + fprintf (stderr, + _("%s: cannot lock %s; try again later.\n"), + Prog, spw_dbname ()); + fail_exit (E_CANTLOCK); + } + spw_locked = true; + } + } + + /* + * Open the files. Use O_RDONLY if we are in read_only mode, O_RDWR + * otherwise. + */ + if (pw_open (read_only ? O_RDONLY : O_RDWR) == 0) { + fprintf (stderr, _("%s: cannot open %s\n"), + Prog, pw_dbname ()); + if (use_system_pw_file) { + SYSLOG ((LOG_WARN, "cannot open %s", pw_dbname ())); + } + fail_exit (E_CANTOPEN); + } + if (is_shadow && !use_tcb) { + if (spw_open (read_only ? O_RDONLY : O_RDWR) == 0) { + fprintf (stderr, _("%s: cannot open %s\n"), + Prog, spw_dbname ()); + if (use_system_spw_file) { + SYSLOG ((LOG_WARN, "cannot open %s", + spw_dbname ())); + } + fail_exit (E_CANTOPEN); + } + spw_opened = true; + } +} + +/* + * close_files - close and unlock the password/shadow databases + * + * If changed is not set, the databases are not closed, and no + * changes are committed in the databases. The databases are + * unlocked anyway. + */ +static void close_files (bool changed) +{ + /* + * All done. If there were no change we can just abandon any + * changes to the files. + */ + if (changed) { + if (pw_close () == 0) { + fprintf (stderr, + _("%s: failure while writing changes to %s\n"), + Prog, pw_dbname ()); + if (use_system_pw_file) { + SYSLOG ((LOG_ERR, + "failure while writing changes to %s", + pw_dbname ())); + } + fail_exit (E_CANTUPDATE); + } + if (spw_opened && (spw_close () == 0)) { + fprintf (stderr, + _("%s: failure while writing changes to %s\n"), + Prog, spw_dbname ()); + if (use_system_spw_file) { + SYSLOG ((LOG_ERR, + "failure while writing changes to %s", + spw_dbname ())); + } + fail_exit (E_CANTUPDATE); + } + spw_opened = false; + } + + /* + * Don't be anti-social - unlock the files when you're done. + */ + if (spw_locked) { + if (spw_unlock () == 0) { + fprintf (stderr, + _("%s: failed to unlock %s\n"), + Prog, spw_dbname ()); + if (use_system_spw_file) { + SYSLOG ((LOG_ERR, "failed to unlock %s", + spw_dbname ())); + } + /* continue */ + } + } + spw_locked = false; + if (pw_locked) { + if (pw_unlock () == 0) { + fprintf (stderr, + _("%s: failed to unlock %s\n"), + Prog, pw_dbname ()); + if (use_system_pw_file) { + SYSLOG ((LOG_ERR, "failed to unlock %s", + pw_dbname ())); + } + /* continue */ + } + } + pw_locked = false; +} + +/* + * check_pw_file - check the content of the passwd file + */ +static void check_pw_file (int *errors, bool *changed) +{ + struct commonio_entry *pfe, *tpfe; + struct passwd *pwd; + struct spwd *spw; + uid_t min_sys_id = (uid_t) getdef_ulong ("SYS_UID_MIN", 101UL); + uid_t max_sys_id = (uid_t) getdef_ulong ("SYS_UID_MAX", 999UL); + + /* + * Loop through the entire password file. + */ + for (pfe = __pw_get_head (); NULL != pfe; pfe = pfe->next) { + /* + * If this is a NIS line, skip it. You can't "know" what NIS + * is going to do without directly asking NIS ... + */ + if (('+' == pfe->line[0]) || ('-' == pfe->line[0])) { + continue; + } + + /* + * Start with the entries that are completely corrupt. They + * have no (struct passwd) entry because they couldn't be + * parsed properly. + */ + if (NULL == pfe->eptr) { + /* + * Tell the user this entire line is bogus and ask + * them to delete it. + */ + puts (_("invalid password file entry")); + printf (_("delete line '%s'? "), pfe->line); + *errors += 1; + + /* + * prompt the user to delete the entry or not + */ + if (!yes_or_no (read_only)) { + continue; + } + + /* + * All password file deletions wind up here. This + * code removes the current entry from the linked + * list. When done, it skips back to the top of the + * loop to try out the next list element. + */ + delete_pw: + if (use_system_pw_file) { + SYSLOG ((LOG_INFO, "delete passwd line '%s'", + pfe->line)); + } + *changed = true; + + __pw_del_entry (pfe); + continue; + } + + /* + * Password structure is good, start using it. + */ + pwd = pfe->eptr; + + /* + * Make sure this entry has a unique name. + */ + for (tpfe = __pw_get_head (); NULL != tpfe; tpfe = tpfe->next) { + const struct passwd *ent = tpfe->eptr; + + /* + * Don't check this entry + */ + if (tpfe == pfe) { + continue; + } + + /* + * Don't check invalid entries. + */ + if (NULL == ent) { + continue; + } + + if (strcmp (pwd->pw_name, ent->pw_name) != 0) { + continue; + } + + /* + * Tell the user this entry is a duplicate of + * another and ask them to delete it. + */ + puts (_("duplicate password entry")); + printf (_("delete line '%s'? "), pfe->line); + *errors += 1; + + /* + * prompt the user to delete the entry or not + */ + if (yes_or_no (read_only)) { + goto delete_pw; + } + } + + /* + * Check for invalid usernames. --marekm + */ + + if (!is_valid_user_name (pwd->pw_name)) { + printf (_("invalid user name '%s'\n"), pwd->pw_name); + *errors += 1; + } + + /* + * Check for invalid user ID. + */ + if (pwd->pw_uid == (uid_t)-1) { + printf (_("invalid user ID '%lu'\n"), (long unsigned int)pwd->pw_uid); + *errors += 1; + } + + /* + * Make sure the primary group exists + */ + /* local, no need for xgetgrgid */ + if (!quiet && (NULL == getgrgid (pwd->pw_gid))) { + + /* + * No primary group, just give a warning + */ + + printf (_("user '%s': no group %lu\n"), + pwd->pw_name, (unsigned long) pwd->pw_gid); + *errors += 1; + } + + /* + * If uid is system and has a home directory, then check + */ + if (!(pwd->pw_uid >= min_sys_id && pwd->pw_uid <= max_sys_id && pwd->pw_dir && pwd->pw_dir[0])) { + /* + * Make sure the home directory exists + */ + if (!quiet && (access (pwd->pw_dir, F_OK) != 0)) { + /* + * Home directory doesn't exist, give a warning + */ + printf (_("user '%s': directory '%s' does not exist\n"), + pwd->pw_name, pwd->pw_dir); + *errors += 1; + } + } + + /* + * Make sure the login shell is executable + */ + if ( !quiet + && ('\0' != pwd->pw_shell[0]) + && (access (pwd->pw_shell, F_OK) != 0)) { + + /* + * Login shell doesn't exist, give a warning + */ + printf (_("user '%s': program '%s' does not exist\n"), + pwd->pw_name, pwd->pw_shell); + *errors += 1; + } + + /* + * Make sure this entry exists in the /etc/shadow file. + */ + + if (is_shadow) { +#ifdef WITH_TCB + if (getdef_bool ("USE_TCB")) { + if (shadowtcb_set_user (pwd->pw_name) == SHADOWTCB_FAILURE) { + printf (_("no tcb directory for %s\n"), + pwd->pw_name); + printf (_("create tcb directory for %s?"), + pwd->pw_name); + *errors += 1; + if (yes_or_no (read_only)) { + if (shadowtcb_create (pwd->pw_name, pwd->pw_uid) == SHADOWTCB_FAILURE) { + *errors += 1; + printf (_("failed to create tcb directory for %s\n"), pwd->pw_name); + continue; + } + } else { + continue; + } + } + if (spw_lock () == 0) { + *errors += 1; + fprintf (stderr, + _("%s: cannot lock %s.\n"), + Prog, spw_dbname ()); + continue; + } + spw_locked = true; + if (spw_open (read_only ? O_RDONLY : O_RDWR) == 0) { + fprintf (stderr, + _("%s: cannot open %s\n"), + Prog, spw_dbname ()); + *errors += 1; + if (spw_unlock () == 0) { + fprintf (stderr, + _("%s: failed to unlock %s\n"), + Prog, spw_dbname ()); + if (use_system_spw_file) { + SYSLOG ((LOG_ERR, + "failed to unlock %s", + spw_dbname ())); + } + } + continue; + } + spw_opened = true; + } +#endif /* WITH_TCB */ + spw = (struct spwd *) spw_locate (pwd->pw_name); + if (NULL == spw) { + printf (_("no matching password file entry in %s\n"), + spw_dbname ()); + printf (_("add user '%s' in %s? "), + pwd->pw_name, spw_dbname ()); + *errors += 1; + if (yes_or_no (read_only)) { + struct spwd sp; + struct passwd pw; + + sp.sp_namp = pwd->pw_name; + sp.sp_pwdp = pwd->pw_passwd; + sp.sp_min = + getdef_num ("PASS_MIN_DAYS", -1); + sp.sp_max = + getdef_num ("PASS_MAX_DAYS", -1); + sp.sp_warn = + getdef_num ("PASS_WARN_AGE", -1); + sp.sp_inact = -1; + sp.sp_expire = -1; + sp.sp_flag = SHADOW_SP_FLAG_UNSET; + sp.sp_lstchg = (long) gettime () / SCALE; + if (0 == sp.sp_lstchg) { + /* Better disable aging than + * requiring a password change + */ + sp.sp_lstchg = -1; + } + *changed = true; + + if (spw_update (&sp) == 0) { + fprintf (stderr, + _("%s: failed to prepare the new %s entry '%s'\n"), + Prog, spw_dbname (), sp.sp_namp); + fail_exit (E_CANTUPDATE); + } + /* remove password from /etc/passwd */ + pw = *pwd; + pw.pw_passwd = SHADOW_PASSWD_STRING; /* XXX warning: const */ + if (pw_update (&pw) == 0) { + fprintf (stderr, + _("%s: failed to prepare the new %s entry '%s'\n"), + Prog, pw_dbname (), pw.pw_name); + fail_exit (E_CANTUPDATE); + } + } + } else { + /* The passwd entry has a shadow counterpart. + * Make sure no passwords are in passwd. + */ + if ( !quiet + && (strcmp (pwd->pw_passwd, + SHADOW_PASSWD_STRING) != 0)) { + printf (_("user %s has an entry in %s, but its password field in %s is not set to 'x'\n"), + pwd->pw_name, spw_dbname (), pw_dbname ()); + *errors += 1; + } + } + } +#ifdef WITH_TCB + if (getdef_bool ("USE_TCB") && spw_locked) { + if (spw_opened && (spw_close () == 0)) { + fprintf (stderr, + _("%s: failure while writing changes to %s\n"), + Prog, spw_dbname ()); + if (use_system_spw_file) { + SYSLOG ((LOG_ERR, + "failure while writing changes to %s", + spw_dbname ())); + } + } else { + spw_opened = false; + } + if (spw_unlock () == 0) { + fprintf (stderr, + _("%s: failed to unlock %s\n"), + Prog, spw_dbname ()); + if (use_system_spw_file) { + SYSLOG ((LOG_ERR, "failed to unlock %s", + spw_dbname ())); + } + } else { + spw_locked = false; + } + } +#endif /* WITH_TCB */ + } +} + +/* + * check_spw_file - check the content of the shadowed password file (shadow) + */ +static void check_spw_file (int *errors, bool *changed) +{ + struct commonio_entry *spe, *tspe; + struct spwd *spw; + + /* + * Loop through the entire shadow password file. + */ + for (spe = __spw_get_head (); NULL != spe; spe = spe->next) { + /* + * Do not treat lines which were missing in shadow + * and were added earlier. + */ + if (NULL == spe->line) { + continue; + } + + /* + * If this is a NIS line, skip it. You can't "know" what NIS + * is going to do without directly asking NIS ... + */ + if (('+' == spe->line[0]) || ('-' == spe->line[0])) { + continue; + } + + /* + * Start with the entries that are completely corrupt. They + * have no (struct spwd) entry because they couldn't be + * parsed properly. + */ + if (NULL == spe->eptr) { + /* + * Tell the user this entire line is bogus and ask + * them to delete it. + */ + puts (_("invalid shadow password file entry")); + printf (_("delete line '%s'? "), spe->line); + *errors += 1; + + /* + * prompt the user to delete the entry or not + */ + if (!yes_or_no (read_only)) { + continue; + } + + /* + * All shadow file deletions wind up here. This code + * removes the current entry from the linked list. + * When done, it skips back to the top of the loop + * to try out the next list element. + */ + delete_spw: + if (use_system_spw_file) { + SYSLOG ((LOG_INFO, "delete shadow line '%s'", + spe->line)); + } + *changed = true; + + __spw_del_entry (spe); + continue; + } + + /* + * Shadow password structure is good, start using it. + */ + spw = spe->eptr; + + /* + * Make sure this entry has a unique name. + */ + for (tspe = __spw_get_head (); NULL != tspe; tspe = tspe->next) { + const struct spwd *ent = tspe->eptr; + + /* + * Don't check this entry + */ + if (tspe == spe) { + continue; + } + + /* + * Don't check invalid entries. + */ + if (NULL == ent) { + continue; + } + + if (strcmp (spw->sp_namp, ent->sp_namp) != 0) { + continue; + } + + /* + * Tell the user this entry is a duplicate of + * another and ask them to delete it. + */ + puts (_("duplicate shadow password entry")); + printf (_("delete line '%s'? "), spe->line); + *errors += 1; + + /* + * prompt the user to delete the entry or not + */ + if (yes_or_no (read_only)) { + goto delete_spw; + } + } + + /* + * Make sure this entry exists in the /etc/passwd + * file. + */ + if (pw_locate (spw->sp_namp) == NULL) { + /* + * Tell the user this entry has no matching + * /etc/passwd entry and ask them to delete it. + */ + printf (_("no matching password file entry in %s\n"), + pw_dbname ()); + printf (_("delete line '%s'? "), spe->line); + *errors += 1; + + /* + * prompt the user to delete the entry or not + */ + if (yes_or_no (read_only)) { + goto delete_spw; + } + } + + /* + * Warn if last password change in the future. --marekm + */ + if (!quiet) { + time_t t = time ((time_t *) 0); + if ( (t != 0) + && (spw->sp_lstchg > (long) t / SCALE)) { + printf (_("user %s: last password change in the future\n"), + spw->sp_namp); + *errors += 1; + } + } + } +} + +/* + * pwck - verify password file integrity + */ +int main (int argc, char **argv) +{ + int errors = 0; + bool changed = false; + + /* + * Get my name so that I can use it to report errors. + */ + Prog = Basename (argv[0]); + + (void) setlocale (LC_ALL, ""); + (void) bindtextdomain (PACKAGE, LOCALEDIR); + (void) textdomain (PACKAGE); + + process_root_flag ("-R", argc, argv); + + OPENLOG ("pwck"); + + /* Parse the command line arguments */ + process_flags (argc, argv); + + open_files (); + + if (sort_mode) { + if (pw_sort () != 0) { + fprintf (stderr, + _("%s: cannot sort entries in %s\n"), + Prog, pw_dbname ()); + fail_exit (E_CANTSORT); + } + if (is_shadow) { + if (spw_sort () != 0) { + fprintf (stderr, + _("%s: cannot sort entries in %s\n"), + Prog, spw_dbname ()); + fail_exit (E_CANTSORT); + } + } + changed = true; + } else { + check_pw_file (&errors, &changed); + + if (is_shadow) { + check_spw_file (&errors, &changed); + } + } + + close_files (changed); + + if (!read_only) { + nscd_flush_cache ("passwd"); + sssd_flush_cache (SSSD_DB_PASSWD); + } + + /* + * Tell the user what we did and exit. + */ + if (0 != errors) { + printf (changed ? + _("%s: the files have been updated\n") : + _("%s: no changes\n"), Prog); + } + + closelog (); + return ((0 != errors) ? E_BADENTRY : E_OKAY); +} + |