shadow/src/chage.c
2007-11-24 22:41:24 +00:00

776 lines
20 KiB
C

/*
* Copyright 1989 - 1994, Julianne Frances Haugh
* 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. Neither the name of Julianne F. Haugh nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH 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 JULIE HAUGH 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 <ctype.h>
#include <fcntl.h>
#include <getopt.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <time.h>
#ifdef USE_PAM
#include "pam_defs.h"
#endif /* USE_PAM */
#include <pwd.h>
#ifdef WITH_SELINUX
#include <selinux/selinux.h>
#include <selinux/av_permissions.h>
#endif
#include "exitcodes.h"
#include "prototypes.h"
#include "defines.h"
#include "pwio.h"
#include "shadowio.h"
/*
* Global variables
*/
static char *Prog;
static int
dflg = 0, /* set last password change date */
Eflg = 0, /* set account expiration date */
Iflg = 0, /* set password inactive after expiration */
lflg = 0, /* show account aging information */
mflg = 0, /* set minimum number of days before password change */
Mflg = 0, /* set maximim number of days before password change */
Wflg = 0; /* set expiration warning days */
static int locks;
static long mindays;
static long maxdays;
static long lastday;
static long warndays;
static long inactdays;
static long expdays;
#define EPOCH "1969-12-31"
/* local function prototypes */
static void usage (void);
static void date_to_str (char *, size_t, time_t);
static int new_fields (void);
static void print_date (time_t);
static void list_fields (void);
/*
* isnum - determine whether or not a string is a number
*/
int isnum (const char *s)
{
while (*s) {
if (!isdigit (*s))
return 0;
s++;
}
return 1;
}
/*
* usage - print command line syntax and exit
*/
static void usage (void)
{
fprintf (stderr, _("Usage: chage [options] [LOGIN]\n"
"\n"
"Options:\n"
" -d, --lastday LAST_DAY set last password change to LAST_DAY\n"
" -E, --expiredate EXPIRE_DATE set account expiration date to EXPIRE_DATE\n"
" -h, --help display this help message and exit\n"
" -I, --inactive INACTIVE set password inactive after expiration\n"
" to INACTIVE\n"
" -l, --list show account aging information\n"
" -m, --mindays MIN_DAYS set minimum number of days before password\n"
" change to MIN_DAYS\n"
" -M, --maxdays MAX_DAYS set maximim number of days before password\n"
" change to MAX_DAYS\n"
" -W, --warndays WARN_DAYS set expiration warning days to WARN_DAYS\n"
"\n"));
exit (E_USAGE);
}
static void date_to_str (char *buf, size_t maxsize, time_t date)
{
struct tm *tp;
tp = gmtime (&date);
#ifdef HAVE_STRFTIME
strftime (buf, maxsize, "%Y-%m-%d", tp);
#else
snprintf (buf, maxsize, "%04d-%02d-%02d",
tp->tm_year + 1900, tp->tm_mon + 1, tp->tm_mday);
#endif /* HAVE_STRFTIME */
}
/*
* new_fields - change the user's password aging information interactively.
*
* prompt the user for all of the password age values. set the fields
* from the user's response, or leave alone if nothing was entered. The
* value (-1) is used to indicate the field should be removed if possible.
* any other negative value is an error. very large positive values will
* be handled elsewhere.
*/
static int new_fields (void)
{
char buf[200];
char *cp;
printf (_("Enter the new value, or press ENTER for the default\n"));
printf ("\n");
snprintf (buf, sizeof buf, "%ld", mindays);
change_field (buf, sizeof buf, _("Minimum Password Age"));
if (((mindays = strtol (buf, &cp, 10)) == 0 && *cp)
|| mindays < -1)
return 0;
snprintf (buf, sizeof buf, "%ld", maxdays);
change_field (buf, sizeof buf, _("Maximum Password Age"));
if (((maxdays = strtol (buf, &cp, 10)) == 0 && *cp)
|| maxdays < -1)
return 0;
date_to_str (buf, sizeof buf, lastday * SCALE);
change_field (buf, sizeof buf, _("Last Password Change (YYYY-MM-DD)"));
if (strcmp (buf, EPOCH) == 0)
lastday = -1;
else if ((lastday = strtoday (buf)) == -1)
return 0;
snprintf (buf, sizeof buf, "%ld", warndays);
change_field (buf, sizeof buf, _("Password Expiration Warning"));
if (((warndays = strtol (buf, &cp, 10)) == 0 && *cp)
|| warndays < -1)
return 0;
snprintf (buf, sizeof buf, "%ld", inactdays);
change_field (buf, sizeof buf, _("Password Inactive"));
if (((inactdays = strtol (buf, &cp, 10)) == 0 && *cp)
|| inactdays < -1)
return 0;
date_to_str (buf, sizeof buf, expdays * SCALE);
change_field (buf, sizeof buf,
_("Account Expiration Date (YYYY-MM-DD)"));
if (strcmp (buf, EPOCH) == 0)
expdays = -1;
else if ((expdays = strtoday (buf)) == -1)
return 0;
return 1;
}
static void print_date (time_t date)
{
#ifdef HAVE_STRFTIME
struct tm *tp;
char buf[80];
tp = gmtime (&date);
strftime (buf, sizeof buf, "%b %d, %Y", tp);
puts (buf);
#else
struct tm *tp;
char *cp;
tp = gmtime (&date);
cp = asctime (tp);
printf ("%6.6s, %4.4s\n", cp + 4, cp + 20);
#endif
}
/*
* list_fields - display the current values of the expiration fields
*
* display the password age information from the password fields. Date
* values will be displayed as a calendar date, or the word "never" if
* the date is 1/1/70, which is day number 0.
*/
static void list_fields (void)
{
long changed = 0;
long expires;
/*
* The "last change" date is either "never" or the date the password
* was last modified. The date is the number of days since 1/1/1970.
*/
printf (_("Last password change\t\t\t\t\t: "));
if (lastday < 0) {
printf (_("never\n"));
} else if (lastday == 0) {
printf (_("password must be changed\n"));
} else {
changed = lastday * SCALE;
print_date (changed);
}
/*
* The password expiration date is determined from the last change
* date plus the number of days the password is valid for.
*/
printf (_("Password expires\t\t\t\t\t: "));
if (lastday <= 0 || maxdays >= 10000 * (DAY / SCALE)
|| maxdays < 0) {
printf (_("never\n"));
} else {
expires = changed + maxdays * SCALE;
print_date (expires);
}
/*
* The account becomes inactive if the password is expired for more
* than "inactdays". The expiration date is calculated and the
* number of inactive days is added. The resulting date is when the
* active will be disabled.
*/
printf (_("Password inactive\t\t\t\t\t: "));
if (lastday <= 0 || inactdays < 0 ||
maxdays >= 10000 * (DAY / SCALE) || maxdays < 0) {
printf (_("never\n"));
} else {
expires = changed + (maxdays + inactdays) * SCALE;
print_date (expires);
}
/*
* The account will expire on the given date regardless of the
* password expiring or not.
*/
printf (_("Account expires\t\t\t\t\t\t: "));
if (expdays < 0) {
printf (_("never\n"));
} else {
expires = expdays * SCALE;
print_date (expires);
}
/*
* Start with the easy numbers - the number of days before the
* password can be changed, the number of days after which the
* password must be chaged, the number of days before the password
* expires that the user is told, and the number of days after the
* password expires that the account becomes unusable.
*/
printf (_("Minimum number of days between password change\t\t: %ld\n"),
mindays);
printf (_("Maximum number of days between password change\t\t: %ld\n"),
maxdays);
printf (_("Number of days of warning before password expires\t: %ld\n"),
warndays);
}
/*
* chage - change a user's password aging information
*
* This command controls the password aging information.
*
* The valid options are
*
* -d set last password change date (*)
* -E set account expiration date (*)
* -I set password inactive after expiration (*)
* -l show account aging information
* -M set maximim number of days before password change (*)
* -m set minimum number of days before password change (*)
* -W set expiration warning days (*)
*
* (*) requires root permission to execute.
*
* All of the time fields are entered in the internal format which is
* either seconds or days.
*/
int main (int argc, char **argv)
{
const struct spwd *sp;
struct spwd spwd;
uid_t ruid;
gid_t rgid;
int amroot;
const struct passwd *pw;
struct passwd pwent;
char name[BUFSIZ];
#ifdef USE_PAM
pam_handle_t *pamh = NULL;
int retval;
#endif
#ifdef WITH_AUDIT
audit_help_open ();
#endif
sanitize_env ();
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
ruid = getuid ();
rgid = getgid ();
amroot = (ruid == 0);
#ifdef WITH_SELINUX
if (amroot && is_selinux_enabled () > 0)
amroot = (selinux_check_passwd_access (PASSWD__ROOTOK) == 0);
#endif
/*
* Get the program name so that error messages can use it.
*/
Prog = Basename (argv[0]);
{
/*
* Parse the command line options.
*/
int option_index = 0;
int c;
static struct option long_options[] = {
{"lastday", required_argument, NULL, 'd'},
{"expiredate", required_argument, NULL, 'E'},
{"help", no_argument, NULL, 'h'},
{"inactive", required_argument, NULL, 'I'},
{"list", no_argument, NULL, 'l'},
{"mindays", required_argument, NULL, 'm'},
{"maxdays", required_argument, NULL, 'M'},
{"warndays", required_argument, NULL, 'W'},
{NULL, 0, NULL, '\0'}
};
while ((c =
getopt_long (argc, argv, "d:E:hI:lm:M:W:", long_options,
&option_index)) != -1) {
switch (c) {
case 'd':
dflg++;
if (!isnum (optarg))
lastday = strtoday (optarg);
else
lastday = strtol (optarg, 0, 10);
break;
case 'E':
Eflg++;
if (!isnum (optarg))
expdays = strtoday (optarg);
else
expdays = strtol (optarg, 0, 10);
break;
case 'h':
usage ();
break;
case 'I':
Iflg++;
inactdays = strtol (optarg, 0, 10);
break;
case 'l':
lflg++;
break;
case 'm':
mflg++;
mindays = strtol (optarg, 0, 10);
break;
case 'M':
Mflg++;
maxdays = strtol (optarg, 0, 10);
break;
case 'W':
Wflg++;
warndays = strtol (optarg, 0, 10);
break;
default:
usage ();
}
}
}
/*
* Make certain the flags do not conflict and that there is a user
* name on the command line.
*/
if (argc != optind + 1)
usage ();
if (lflg && (mflg || Mflg || dflg || Wflg || Iflg || Eflg)) {
fprintf (stderr,
_("%s: do not include \"l\" with other flags\n"),
Prog);
usage ();
}
/*
* An unprivileged user can ask for their own aging information, but
* only root can change it, or list another user's aging
* information.
*/
if (!amroot && !lflg) {
fprintf (stderr, _("%s: Permission denied.\n"), Prog);
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "change age", NULL,
getuid (), 0);
#endif
exit (E_NOPERM);
}
OPENLOG ("chage");
#ifdef USE_PAM
retval = PAM_SUCCESS;
{
struct passwd *pampw;
pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
if (pampw == NULL) {
retval = PAM_USER_UNKNOWN;
}
if (retval == PAM_SUCCESS) {
retval = pam_start ("chage", pampw->pw_name,
&conv, &pamh);
}
}
if (retval == PAM_SUCCESS) {
retval = pam_authenticate (pamh, 0);
if (retval != PAM_SUCCESS) {
pam_end (pamh, retval);
}
}
if (retval == PAM_SUCCESS) {
retval = pam_acct_mgmt (pamh, 0);
if (retval != PAM_SUCCESS) {
pam_end (pamh, retval);
}
}
if (retval != PAM_SUCCESS) {
fprintf (stderr, _("%s: PAM authentication failed\n"), Prog);
exit (E_NOPERM);
}
#endif /* USE_PAM */
/*
* We use locks for read-write accesses only (locks implies amroot,
* but amroot doesn't imply locks).
*/
locks = !lflg;
/*
* Lock and open the password file. This loads all of the password
* file entries into memory. Then we get a pointer to the password
* file entry for the requested user.
*/
if (!pw_open (O_RDONLY)) {
fprintf (stderr, _("%s: can't open password file\n"), Prog);
SYSLOG ((LOG_ERR, "failed opening %s", PASSWD_FILE));
closelog ();
exit (E_NOPERM);
}
if (!(pw = pw_locate (argv[optind]))) {
fprintf (stderr, _("%s: unknown user %s\n"), Prog,
argv[optind]);
closelog ();
exit (E_NOPERM);
}
pwent = *pw;
STRFCPY (name, pwent.pw_name);
if (!spw_file_present ()) {
fprintf (stderr,
_("%s: the shadow password file is not present\n"),
Prog);
SYSLOG ((LOG_ERR, "can't find the shadow password file"));
closelog ();
exit (E_SHADOW_NOTFOUND);
}
/*
* For shadow password files we have to lock the file and read in
* the entries as was done for the password file. The user entries
* does not have to exist in this case; a new entry will be created
* for this user if one does not exist already.
*/
if (locks && !spw_lock ()) {
fprintf (stderr,
_("%s: can't lock shadow password file\n"), Prog);
SYSLOG ((LOG_ERR, "failed locking %s", SHADOW_FILE));
closelog ();
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "change age", name,
getuid (), 0);
#endif
exit (E_NOPERM);
}
if (!spw_open (locks ? O_RDWR : O_RDONLY)) {
fprintf (stderr,
_("%s: can't open shadow password file\n"), Prog);
spw_unlock ();
SYSLOG ((LOG_ERR, "failed opening %s", SHADOW_FILE));
closelog ();
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "change age", name,
getuid (), 0);
#endif
exit (E_NOPERM);
}
if (lflg && (setregid (rgid, rgid) || setreuid (ruid, ruid))) {
fprintf (stderr, _("%s: failed to drop privileges (%s)\n"),
Prog, strerror (errno));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "change age", name,
getuid (), 0);
#endif
exit (E_NOPERM);
}
sp = spw_locate (argv[optind]);
/*
* Set the fields that aren't being set from the command line from
* the password file.
*/
if (sp) {
spwd = *sp;
if (!Mflg)
maxdays = spwd.sp_max;
if (!mflg)
mindays = spwd.sp_min;
if (!dflg)
lastday = spwd.sp_lstchg;
if (!Wflg)
warndays = spwd.sp_warn;
if (!Iflg)
inactdays = spwd.sp_inact;
if (!Eflg)
expdays = spwd.sp_expire;
#ifdef WITH_AUDIT
if (Mflg)
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"change max age", pw->pw_name, pw->pw_uid,
1);
if (mflg)
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"change min age", pw->pw_name, pw->pw_uid,
1);
if (dflg) {
char new_lastchg[200];
char old_lastchg[200];
date_to_str (new_lastchg, sizeof new_lastchg,
lastday * DAY);
date_to_str (old_lastchg, sizeof old_lastchg,
spwd.sp_lstchg * DAY);
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"change last change date", pw->pw_name,
pw->pw_uid, 1);
}
if (Wflg)
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"change passwd warning", pw->pw_name,
pw->pw_uid, 1);
if (Iflg)
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"change inactive days", pw->pw_name,
pw->pw_uid, 1);
if (Eflg) {
char new_exp[200];
char old_exp[200];
date_to_str (new_exp, sizeof new_exp, expdays * DAY);
date_to_str (old_exp, sizeof old_exp,
spwd.sp_expire * DAY);
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"change passwd expiration", pw->pw_name,
pw->pw_uid, 1);
}
#endif
}
/*
* Print out the expiration fields if the user has requested the
* list option.
*/
if (lflg) {
if (!amroot && (ruid != pwent.pw_uid)) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "change age",
pw->pw_name, pw->pw_uid, 0);
#endif
fprintf (stderr, _("%s: Permission denied.\n"), Prog);
closelog ();
exit (E_NOPERM);
}
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "display aging info",
pw->pw_name, pw->pw_uid, 1);
#endif
list_fields ();
spw_unlock ();
closelog ();
exit (E_SUCCESS);
}
/*
* If none of the fields were changed from the command line, let the
* user interactively change them.
*/
if (!mflg && !Mflg && !dflg && !Wflg && !Iflg && !Eflg) {
printf (_("Changing the aging information for %s\n"), name);
if (!new_fields ()) {
fprintf (stderr, _("%s: error changing fields\n"),
Prog);
spw_unlock ();
closelog ();
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "change age",
pw->pw_name, getuid (), 0);
#endif
exit (E_NOPERM);
}
#ifdef WITH_AUDIT
else
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"change all aging information",
pw->pw_name, getuid (), 1);
#endif
}
/*
* There was no shadow entry. The new entry will have the encrypted
* password transferred from the normal password file along with the
* aging information.
*/
if (sp == 0) {
sp = &spwd;
memzero (&spwd, sizeof spwd);
spwd.sp_namp = xstrdup (pwent.pw_name);
spwd.sp_pwdp = xstrdup (pwent.pw_passwd);
spwd.sp_flag = -1;
pwent.pw_passwd = SHADOW_PASSWD_STRING; /* XXX warning: const */
if (!pw_update (&pwent)) {
fprintf (stderr,
_("%s: can't update password file\n"), Prog);
spw_unlock ();
SYSLOG ((LOG_ERR, "failed updating %s", PASSWD_FILE));
closelog ();
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "change age",
pw->pw_name, getuid (), 0);
#endif
exit (E_NOPERM);
}
}
/*
* Copy the fields back to the shadow file entry and write the
* modified entry back to the shadow file. Closing the shadow and
* password files will commit any changes that have been made.
*/
spwd.sp_max = maxdays;
spwd.sp_min = mindays;
spwd.sp_lstchg = lastday;
spwd.sp_warn = warndays;
spwd.sp_inact = inactdays;
spwd.sp_expire = expdays;
if (!spw_update (&spwd)) {
fprintf (stderr,
_("%s: can't update shadow password file\n"), Prog);
spw_unlock ();
SYSLOG ((LOG_ERR, "failed updating %s", SHADOW_FILE));
closelog ();
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "change age",
pw->pw_name, getuid (), 0);
#endif
exit (E_NOPERM);
}
/*
* Now close the shadow password file, which will cause all of the
* entries to be re-written.
*/
if (!spw_close ()) {
fprintf (stderr,
_("%s: can't rewrite shadow password file\n"), Prog);
spw_unlock ();
SYSLOG ((LOG_ERR, "failed rewriting %s", SHADOW_FILE));
closelog ();
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "change age",
pw->pw_name, getuid (), 0);
#endif
exit (E_NOPERM);
}
/*
* Close the password file. If any entries were modified, the file
* will be re-written.
*/
if (!pw_close ()) {
fprintf (stderr, _("%s: can't rewrite password file\n"), Prog);
spw_unlock ();
SYSLOG ((LOG_ERR, "failed rewriting %s", PASSWD_FILE));
closelog ();
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "change age",
pw->pw_name, getuid (), 0);
#endif
exit (E_NOPERM);
}
spw_unlock ();
SYSLOG ((LOG_INFO, "changed password expiry for %s", name));
#ifdef USE_PAM
if (retval == PAM_SUCCESS)
pam_end (pamh, PAM_SUCCESS);
#endif /* USE_PAM */
closelog ();
exit (E_SUCCESS);
}