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Diffstat (limited to 'src/pwconv.c')
| -rw-r--r-- | src/pwconv.c | 336 |
1 files changed, 336 insertions, 0 deletions
diff --git a/src/pwconv.c b/src/pwconv.c new file mode 100644 index 0000000..f932f26 --- /dev/null +++ b/src/pwconv.c @@ -0,0 +1,336 @@ +/* + * Copyright (c) 1996 - 2000, Marek Michałkiewicz + * Copyright (c) 2002 - 2006, Tomasz Kłoczko + * Copyright (c) 2009 - 2012, 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. + */ + +/* + * pwconv - create or update /etc/shadow with information from + * /etc/passwd. + * + * It is more like SysV pwconv, slightly different from the original Shadow + * pwconv. Depends on "x" as password in /etc/passwd which means that the + * password has already been moved to /etc/shadow. There is no need to move + * /etc/npasswd to /etc/passwd, password files are updated using library + * routines with proper locking. + * + * Can be used to update /etc/shadow after adding/deleting users by editing + * /etc/passwd. There is no man page yet, but this program should be close + * to pwconv(1M) on Solaris 2.x. + * + * Warning: make sure that all users have "x" as the password in /etc/passwd + * before running this program for the first time on a system which already + * has shadow passwords. Anything else (like "*" from old versions of the + * shadow suite) will replace the user's encrypted password in /etc/shadow. + * + * Doesn't currently support pw_age information in /etc/passwd, and doesn't + * support DBM files. Add it if you need it... + * + */ + +#include <config.h> + +#ident "$Id$" + +#include <errno.h> +#include <fcntl.h> +#include <pwd.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <time.h> +#include <unistd.h> +#include <getopt.h> +#include "defines.h" +#include "getdef.h" +#include "prototypes.h" +#include "pwio.h" +#include "shadowio.h" +#include "nscd.h" +#include "sssd.h" + +/* + * exit status values + */ +/*@-exitarg@*/ +#define E_SUCCESS 0 /* success */ +#define E_NOPERM 1 /* permission denied */ +#define E_USAGE 2 /* invalid command syntax */ +#define E_FAILURE 3 /* unexpected failure, nothing done */ +#define E_MISSING 4 /* unexpected failure, passwd file missing */ +#define E_PWDBUSY 5 /* passwd file(s) busy */ +#define E_BADENTRY 6 /* bad shadow entry */ +/* + * Global variables + */ +const char *Prog; + +static bool spw_locked = false; +static bool pw_locked = false; + +/* local function prototypes */ +static void fail_exit (int status); +static void usage (int status); +static void process_flags (int argc, char **argv); + +static void fail_exit (int status) +{ + 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 (status); +} + +static void usage (int status) +{ + FILE *usageout = (E_SUCCESS != status) ? stderr : stdout; + (void) fprintf (usageout, + _("Usage: %s [options]\n" + "\n" + "Options:\n"), + Prog); + (void) fputs (_(" -h, --help display this help message and exit\n"), usageout); + (void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\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) +{ + /* + * Parse the command line options. + */ + int c; + static struct option long_options[] = { + {"help", no_argument, NULL, 'h'}, + {"root", required_argument, NULL, 'R'}, + {NULL, 0, NULL, '\0'} + }; + + while ((c = getopt_long (argc, argv, "hR:", + long_options, NULL)) != -1) { + switch (c) { + case 'h': + usage (E_SUCCESS); + /*@notreached@*/break; + case 'R': /* no-op, handled in process_root_flag () */ + break; + default: + usage (E_USAGE); + } + } + + if (optind != argc) { + usage (E_USAGE); + } +} + +int main (int argc, char **argv) +{ + const struct passwd *pw; + struct passwd pwent; + const struct spwd *sp; + struct spwd spent; + + Prog = Basename (argv[0]); + + (void) setlocale (LC_ALL, ""); + (void) bindtextdomain (PACKAGE, LOCALEDIR); + (void) textdomain (PACKAGE); + + process_root_flag ("-R", argc, argv); + + OPENLOG ("pwconv"); + + process_flags (argc, argv); + +#ifdef WITH_TCB + if (getdef_bool("USE_TCB")) { + fprintf (stderr, _("%s: can't work with tcb enabled\n"), Prog); + exit (E_FAILURE); + } +#endif /* WITH_TCB */ + + if (pw_lock () == 0) { + fprintf (stderr, + _("%s: cannot lock %s; try again later.\n"), + Prog, pw_dbname ()); + fail_exit (E_PWDBUSY); + } + pw_locked = true; + if (pw_open (O_CREAT | O_RDWR) == 0) { + fprintf (stderr, + _("%s: cannot open %s\n"), Prog, pw_dbname ()); + fail_exit (E_MISSING); + } + + if (spw_lock () == 0) { + fprintf (stderr, + _("%s: cannot lock %s; try again later.\n"), + Prog, spw_dbname ()); + fail_exit (E_PWDBUSY); + } + spw_locked = true; + if (spw_open (O_CREAT | O_RDWR) == 0) { + fprintf (stderr, + _("%s: cannot open %s\n"), Prog, spw_dbname ()); + fail_exit (E_FAILURE); + } + + /* + * Remove /etc/shadow entries for users not in /etc/passwd. + */ + (void) spw_rewind (); + while ((sp = spw_next ()) != NULL) { + if (pw_locate (sp->sp_namp) != NULL) { + continue; + } + + if (spw_remove (sp->sp_namp) == 0) { + /* + * This shouldn't happen (the entry exists) but... + */ + fprintf (stderr, + _("%s: cannot remove entry '%s' from %s\n"), + Prog, sp->sp_namp, spw_dbname ()); + fail_exit (E_FAILURE); + } + (void) spw_rewind(); + } + + /* + * Update shadow entries which don't have "x" as pw_passwd. Add any + * missing shadow entries. + */ + (void) pw_rewind (); + while ((pw = pw_next ()) != NULL) { + sp = spw_locate (pw->pw_name); + if (NULL != sp) { + /* do we need to update this entry? */ + if (strcmp (pw->pw_passwd, SHADOW_PASSWD_STRING) == 0) { + continue; + } + /* update existing shadow entry */ + spent = *sp; + } else { + /* add new shadow entry */ + memset (&spent, 0, sizeof spent); + spent.sp_namp = pw->pw_name; + spent.sp_min = getdef_num ("PASS_MIN_DAYS", -1); + spent.sp_max = getdef_num ("PASS_MAX_DAYS", -1); + spent.sp_warn = getdef_num ("PASS_WARN_AGE", -1); + spent.sp_inact = -1; + spent.sp_expire = -1; + spent.sp_flag = SHADOW_SP_FLAG_UNSET; + } + spent.sp_pwdp = pw->pw_passwd; + spent.sp_lstchg = (long) gettime () / SCALE; + if (0 == spent.sp_lstchg) { + /* Better disable aging than requiring a password + * change */ + spent.sp_lstchg = -1; + } + if (spw_update (&spent) == 0) { + fprintf (stderr, + _("%s: failed to prepare the new %s entry '%s'\n"), + Prog, spw_dbname (), spent.sp_namp); + fail_exit (E_FAILURE); + } + + /* remove password from /etc/passwd */ + pwent = *pw; + pwent.pw_passwd = SHADOW_PASSWD_STRING; /* XXX warning: const */ + if (pw_update (&pwent) == 0) { + fprintf (stderr, + _("%s: failed to prepare the new %s entry '%s'\n"), + Prog, pw_dbname (), pwent.pw_name); + fail_exit (E_FAILURE); + } + } + + 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 (E_FAILURE); + } + 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 (E_FAILURE); + } + + /* /etc/passwd- (backup file) */ + errno = 0; + if ((chmod (PASSWD_FILE "-", 0600) != 0) && (errno != ENOENT)) { + fprintf (stderr, + _("%s: failed to change the mode of %s to 0600\n"), + Prog, PASSWD_FILE "-"); + SYSLOG ((LOG_ERR, "failed to change the mode of %s to 0600", PASSWD_FILE "-")); + /* continue */ + } + + 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_unlock () == 0) { + fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ()); + SYSLOG ((LOG_ERR, "failed to unlock %s", spw_dbname ())); + /* continue */ + } + + nscd_flush_cache ("passwd"); + sssd_flush_cache (SSSD_DB_PASSWD); + + return E_SUCCESS; +} + |