Adding upstream version 1:4.5.upstream/1%4.5upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 948 insertions, 0 deletions

diff --git a/src/chage.c b/src/chage.c
new file mode 100644
index 0000000..617e90f
--- /dev/null
+++ b/src/chage.c
@@ -0,0 +1,948 @@
+/*
+ * Copyright (c) 1989 - 1994, Julianne Frances Haugh
+ * Copyright (c) 1996 - 2000, Marek Michałkiewicz
+ * Copyright (c) 2000 - 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 <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 ACCT_TOOLS_SETUID
+#ifdef USE_PAM
+#include "pam_defs.h"
+#endif				/* USE_PAM */
+#endif				/* ACCT_TOOLS_SETUID */
+#include <pwd.h>
+#ifdef WITH_SELINUX
+#include <selinux/selinux.h>
+#include <selinux/av_permissions.h>
+#endif
+#include "prototypes.h"
+#include "defines.h"
+#include "pwio.h"
+#include "shadowio.h"
+#ifdef WITH_TCB
+#include "tcbfuncs.h"
+#endif
+/*@-exitarg@*/
+#include "exitcodes.h"
+
+/*
+ * Global variables
+ */
+const char *Prog;
+
+static bool
+    dflg = false,		/* set last password change date */
+    Eflg = false,		/* set account expiration date */
+    Iflg = false,		/* set password inactive after expiration */
+    lflg = false,		/* show account aging information */
+    mflg = false,		/* set minimum number of days before password change */
+    Mflg = false,		/* set maximum number of days before password change */
+    Wflg = false;		/* set expiration warning days */
+static bool amroot = false;
+
+static bool pw_locked  = false;	/* Indicate if the password file is locked */
+static bool spw_locked = false;	/* Indicate if the shadow file is locked */
+/* The name and UID of the user being worked on */
+static char user_name[BUFSIZ] = "";
+static uid_t user_uid = -1;
+
+static long mindays;
+static long maxdays;
+static long lstchgdate;
+static long warndays;
+static long inactdays;
+static long expdate;
+
+/* local function prototypes */
+static /*@noreturn@*/void usage (int status);
+static void date_to_str (char *buf, size_t maxsize, time_t date);
+static int new_fields (void);
+static void print_date (time_t date);
+static void list_fields (void);
+static void process_flags (int argc, char **argv);
+static void check_flags (int argc, int opt_index);
+static void check_perms (void);
+static void open_files (bool readonly);
+static void close_files (void);
+static /*@noreturn@*/void fail_exit (int code);
+
+/*
+ * fail_exit - do some cleanup and exit with the given error code
+ */
+static /*@noreturn@*/void fail_exit (int code)
+{
+	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 */
+		}
+	}
+	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 */
+		}
+	}
+	closelog ();
+
+#ifdef WITH_AUDIT
+	if (E_SUCCESS != code) {
+		audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
+		              "change age",
+		              user_name, (unsigned int) user_uid, 0);
+	}
+#endif
+
+	exit (code);
+}
+
+/*
+ * usage - print command line syntax and exit
+ */
+static /*@noreturn@*/void usage (int status)
+{
+	FILE *usageout = (E_SUCCESS != status) ? stderr : stdout;
+	(void) fprintf (usageout,
+	                _("Usage: %s [options] LOGIN\n"
+	                  "\n"
+	                  "Options:\n"),
+	                Prog);
+	(void) fputs (_("  -d, --lastday LAST_DAY        set date of last password change to LAST_DAY\n"), usageout);
+	(void) fputs (_("  -E, --expiredate EXPIRE_DATE  set account expiration date to EXPIRE_DATE\n"), usageout);
+	(void) fputs (_("  -h, --help                    display this help message and exit\n"), usageout);
+	(void) fputs (_("  -I, --inactive INACTIVE       set password inactive after expiration\n"
+	                "                                to INACTIVE\n"), usageout);
+	(void) fputs (_("  -l, --list                    show account aging information\n"), usageout);
+	(void) fputs (_("  -m, --mindays MIN_DAYS        set minimum number of days before password\n"
+	                "                                change to MIN_DAYS\n"), usageout);
+	(void) fputs (_("  -M, --maxdays MAX_DAYS        set maximim number of days before password\n"
+	                "                                change to MAX_DAYS\n"), usageout);
+	(void) fputs (_("  -R, --root CHROOT_DIR         directory to chroot into\n"), usageout);
+	(void) fputs (_("  -W, --warndays WARN_DAYS      set expiration warning days to WARN_DAYS\n"), usageout);
+	(void) fputs ("\n", usageout);
+	exit (status);
+}
+
+static void date_to_str (char *buf, size_t maxsize, time_t date)
+{
+	struct tm *tp;
+
+	tp = gmtime (&date);
+#ifdef HAVE_STRFTIME
+	(void) strftime (buf, maxsize, "%Y-%m-%d", tp);
+#else
+	(void) 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];
+
+	(void) puts (_("Enter the new value, or press ENTER for the default"));
+	(void) puts ("");
+
+	(void) snprintf (buf, sizeof buf, "%ld", mindays);
+	change_field (buf, sizeof buf, _("Minimum Password Age"));
+	if (   (getlong (buf, &mindays) == 0)
+	    || (mindays < -1)) {
+		return 0;
+	}
+
+	(void) snprintf (buf, sizeof buf, "%ld", maxdays);
+	change_field (buf, sizeof buf, _("Maximum Password Age"));
+	if (   (getlong (buf, &maxdays) == 0)
+	    || (maxdays < -1)) {
+		return 0;
+	}
+
+	if (-1 == lstchgdate) {
+		strcpy (buf, "-1");
+	} else {
+		date_to_str (buf, sizeof buf, (time_t) lstchgdate * SCALE);
+	}
+
+	change_field (buf, sizeof buf, _("Last Password Change (YYYY-MM-DD)"));
+
+	if (strcmp (buf, "-1") == 0) {
+		lstchgdate = -1;
+	} else {
+		lstchgdate = strtoday (buf);
+		if (lstchgdate <= -1) {
+			return 0;
+		}
+	}
+
+	(void) snprintf (buf, sizeof buf, "%ld", warndays);
+	change_field (buf, sizeof buf, _("Password Expiration Warning"));
+	if (   (getlong (buf, &warndays) == 0)
+	    || (warndays < -1)) {
+		return 0;
+	}
+
+	(void) snprintf (buf, sizeof buf, "%ld", inactdays);
+	change_field (buf, sizeof buf, _("Password Inactive"));
+	if (   (getlong (buf, &inactdays) == 0)
+	    || (inactdays < -1)) {
+		return 0;
+	}
+
+	if (-1 == expdate) {
+		strcpy (buf, "-1");
+	} else {
+		date_to_str (buf, sizeof buf, (time_t) expdate * SCALE);
+	}
+
+	change_field (buf, sizeof buf,
+	              _("Account Expiration Date (YYYY-MM-DD)"));
+
+	if (strcmp (buf, "-1") == 0) {
+		expdate = -1;
+	} else {
+		expdate = strtoday (buf);
+		if (expdate <= -1) {
+			return 0;
+		}
+	}
+
+	return 1;
+}
+
+static void print_date (time_t date)
+{
+#ifdef HAVE_STRFTIME
+	struct tm *tp;
+	char buf[80];
+
+	tp = gmtime (&date);
+	if (NULL == tp) {
+		(void) printf ("time_t: %lu\n", (unsigned long)date);
+	} else {
+		(void) strftime (buf, sizeof buf, "%b %d, %Y", tp);
+		(void) puts (buf);
+	}
+#else
+	struct tm *tp;
+	char *cp = NULL;
+
+	tp = gmtime (&date);
+	if (NULL != tp) {
+		cp = asctime (tp);
+	}
+	if (NULL != cp) {
+		(void) printf ("%6.6s, %4.4s\n", cp + 4, cp + 20);
+	} else {
+		(void) printf ("time_t: %lu\n", date);
+	}
+#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.
+	 */
+	(void) fputs (_("Last password change\t\t\t\t\t: "), stdout);
+	if (lstchgdate < 0) {
+		(void) puts (_("never"));
+	} else if (lstchgdate == 0) {
+		(void) puts (_("password must be changed"));
+	} else {
+		changed = lstchgdate * SCALE;
+		print_date ((time_t) changed);
+	}
+
+	/*
+	 * The password expiration date is determined from the last change
+	 * date plus the number of days the password is valid for.
+	 */
+	(void) fputs (_("Password expires\t\t\t\t\t: "), stdout);
+	if (lstchgdate == 0) {
+		(void) puts (_("password must be changed"));
+	} else if (   (lstchgdate < 0)
+	           || (maxdays >= (10000 * (DAY / SCALE)))
+	           || (maxdays < 0)) {
+		(void) puts (_("never"));
+	} else {
+		expires = changed + maxdays * SCALE;
+		print_date ((time_t) 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.
+	 */
+	(void) fputs (_("Password inactive\t\t\t\t\t: "), stdout);
+	if (lstchgdate == 0) {
+		(void) puts (_("password must be changed"));
+	} else if (   (lstchgdate < 0)
+	           || (inactdays < 0)
+	           || (maxdays >= (10000 * (DAY / SCALE)))
+	           || (maxdays < 0)) {
+		(void) puts (_("never"));
+	} else {
+		expires = changed + (maxdays + inactdays) * SCALE;
+		print_date ((time_t) expires);
+	}
+
+	/*
+	 * The account will expire on the given date regardless of the
+	 * password expiring or not.
+	 */
+	(void) fputs (_("Account expires\t\t\t\t\t\t: "), stdout);
+	if (expdate < 0) {
+		(void) puts (_("never"));
+	} else {
+		expires = expdate * SCALE;
+		print_date ((time_t) 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);
+}
+
+/*
+ * 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[] = {
+		{"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'},
+		{"root",       required_argument, NULL, 'R'},
+		{"warndays",   required_argument, NULL, 'W'},
+		{NULL, 0, NULL, '\0'}
+	};
+
+	while ((c = getopt_long (argc, argv, "d:E:hI:lm:M:R:W:",
+	                         long_options, NULL)) != -1) {
+		switch (c) {
+		case 'd':
+			dflg = true;
+			lstchgdate = strtoday (optarg);
+			if (lstchgdate < -1) {
+				fprintf (stderr,
+				         _("%s: invalid date '%s'\n"),
+				         Prog, optarg);
+				usage (E_USAGE);
+			}
+			break;
+		case 'E':
+			Eflg = true;
+			expdate = strtoday (optarg);
+			if (expdate < -1) {
+				fprintf (stderr,
+				         _("%s: invalid date '%s'\n"),
+				         Prog, optarg);
+				usage (E_USAGE);
+			}
+			break;
+		case 'h':
+			usage (E_SUCCESS);
+			/*@notreached@*/break;
+		case 'I':
+			Iflg = true;
+			if (   (getlong (optarg, &inactdays) == 0)
+			    || (inactdays < -1)) {
+				fprintf (stderr,
+				         _("%s: invalid numeric argument '%s'\n"),
+				         Prog, optarg);
+				usage (E_USAGE);
+			}
+			break;
+		case 'l':
+			lflg = true;
+			break;
+		case 'm':
+			mflg = true;
+			if (   (getlong (optarg, &mindays) == 0)
+			    || (mindays < -1)) {
+				fprintf (stderr,
+				         _("%s: invalid numeric argument '%s'\n"),
+				         Prog, optarg);
+				usage (E_USAGE);
+			}
+			break;
+		case 'M':
+			Mflg = true;
+			if (   (getlong (optarg, &maxdays) == 0)
+			    || (maxdays < -1)) {
+				fprintf (stderr,
+				         _("%s: invalid numeric argument '%s'\n"),
+				         Prog, optarg);
+				usage (E_USAGE);
+			}
+			break;
+		case 'R': /* no-op, handled in process_root_flag () */
+			break;
+		case 'W':
+			Wflg = true;
+			if (   (getlong (optarg, &warndays) == 0)
+			    || (warndays < -1)) {
+				fprintf (stderr,
+				         _("%s: invalid numeric argument '%s'\n"),
+				         Prog, optarg);
+				usage (E_USAGE);
+			}
+			break;
+		default:
+			usage (E_USAGE);
+		}
+	}
+
+	check_flags (argc, optind);
+}
+
+/*
+ * check_flags - check flags and parameters consistency
+ *
+ *	It will not return if an error is encountered.
+ */
+static void check_flags (int argc, int opt_index)
+{
+	/*
+	 * Make certain the flags do not conflict and that there is a user
+	 * name on the command line.
+	 */
+
+	if (argc != opt_index + 1) {
+		usage (E_USAGE);
+	}
+
+	if (lflg && (mflg || Mflg || dflg || Wflg || Iflg || Eflg)) {
+		fprintf (stderr,
+		         _("%s: do not include \"l\" with other flags\n"),
+		         Prog);
+		usage (E_USAGE);
+	}
+}
+
+/*
+ * check_perms - check if the caller is allowed to add a group
+ *
+ *	Non-root users are only allowed to display their aging information.
+ *	(we will later make sure that the user is only listing her aging
+ *	information)
+ *
+ *	With PAM support, the setuid bit can be set on chage 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;
+	struct passwd *pampw;
+	int retval;
+#endif				/* USE_PAM */
+#endif				/* ACCT_TOOLS_SETUID */
+
+	/*
+	 * 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);
+		fail_exit (E_NOPERM);
+	}
+
+#ifdef ACCT_TOOLS_SETUID
+#ifdef USE_PAM
+	pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
+	if (NULL == pampw) {
+		fprintf (stderr,
+		         _("%s: Cannot determine your user name.\n"),
+		         Prog);
+		exit (E_NOPERM);
+	}
+
+	retval = pam_start ("chage", 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);
+		}
+		fail_exit (E_NOPERM);
+	}
+	(void) pam_end (pamh, retval);
+#endif				/* USE_PAM */
+#endif				/* ACCT_TOOLS_SETUID */
+}
+
+/*
+ * 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 (bool readonly)
+{
+	/*
+	 * 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 (!readonly) {
+		if (pw_lock () == 0) {
+			fprintf (stderr,
+			         _("%s: cannot lock %s; try again later.\n"),
+			         Prog, pw_dbname ());
+			fail_exit (E_NOPERM);
+		}
+		pw_locked = true;
+	}
+	if (pw_open (readonly ? O_RDONLY: O_CREAT | O_RDWR) == 0) {
+		fprintf (stderr, _("%s: cannot open %s\n"), Prog, pw_dbname ());
+		SYSLOG ((LOG_WARN, "cannot open %s", pw_dbname ()));
+		fail_exit (E_NOPERM);
+	}
+
+	/*
+	 * 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 (!readonly) {
+		if (spw_lock () == 0) {
+			fprintf (stderr,
+			         _("%s: cannot lock %s; try again later.\n"),
+			         Prog, spw_dbname ());
+			fail_exit (E_NOPERM);
+		}
+		spw_locked = true;
+	}
+	if (spw_open (readonly ? O_RDONLY: O_CREAT | O_RDWR) == 0) {
+		fprintf (stderr,
+		         _("%s: cannot open %s\n"), Prog, spw_dbname ());
+		SYSLOG ((LOG_WARN, "cannot open %s", spw_dbname ()));
+		fail_exit (E_NOPERM);
+	}
+}
+
+/*
+ * close_files - close and unlock the password/shadow databases
+ */
+static void close_files (void)
+{
+	/*
+	 * Now close the shadow password file, which will cause all of the
+	 * entries to be re-written.
+	 */
+	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_NOPERM);
+	}
+
+	/*
+	 * Close the password file. If any entries were modified, the file
+	 * will be re-written.
+	 */
+	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_NOPERM);
+	}
+	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_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;
+}
+
+/*
+ * update_age - update the aging information in the database
+ *
+ *	It will not return in case of error
+ */
+static void update_age (/*@null@*/const struct spwd *sp,
+                        /*@notnull@*/const struct passwd *pw)
+{
+	struct spwd spwent;
+
+	/*
+	 * 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 (NULL == sp) {
+		struct passwd pwent = *pw;
+
+		memzero (&spwent, sizeof spwent);
+		spwent.sp_namp = xstrdup (pwent.pw_name);
+		spwent.sp_pwdp = xstrdup (pwent.pw_passwd);
+		spwent.sp_flag = SHADOW_SP_FLAG_UNSET;
+
+		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_NOPERM);
+		}
+	} else {
+		spwent.sp_namp = xstrdup (sp->sp_namp);
+		spwent.sp_pwdp = xstrdup (sp->sp_pwdp);
+		spwent.sp_flag = sp->sp_flag;
+	}
+
+	/*
+	 * 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.
+	 */
+	spwent.sp_max = maxdays;
+	spwent.sp_min = mindays;
+	spwent.sp_lstchg = lstchgdate;
+	spwent.sp_warn = warndays;
+	spwent.sp_inact = inactdays;
+	spwent.sp_expire = expdate;
+
+	if (spw_update (&spwent) == 0) {
+		fprintf (stderr,
+		         _("%s: failed to prepare the new %s entry '%s'\n"), Prog, spw_dbname (), spwent.sp_namp);
+		fail_exit (E_NOPERM);
+	}
+
+}
+
+/*
+ * get_defaults - get the value of the fields not set from the command line
+ */
+static void get_defaults (/*@null@*/const struct spwd *sp)
+{
+	/*
+	 * Set the fields that aren't being set from the command line from
+	 * the password file.
+	 */
+	if (NULL != sp) {
+		if (!Mflg) {
+			maxdays = sp->sp_max;
+		}
+		if (!mflg) {
+			mindays = sp->sp_min;
+		}
+		if (!dflg) {
+			lstchgdate = sp->sp_lstchg;
+		}
+		if (!Wflg) {
+			warndays = sp->sp_warn;
+		}
+		if (!Iflg) {
+			inactdays = sp->sp_inact;
+		}
+		if (!Eflg) {
+			expdate = sp->sp_expire;
+		}
+	} else {
+		/*
+		 * Use default values that will not change the behavior of the
+		 * account.
+		 */
+		if (!Mflg) {
+			maxdays = -1;
+		}
+		if (!mflg) {
+			mindays = -1;
+		}
+		if (!dflg) {
+			lstchgdate = -1;
+		}
+		if (!Wflg) {
+			warndays = -1;
+		}
+		if (!Iflg) {
+			inactdays = -1;
+		}
+		if (!Eflg) {
+			expdate = -1;
+		}
+	}
+}
+
+/*
+ * 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;
+	uid_t ruid;
+	gid_t rgid;
+	const struct passwd *pw;
+
+	/*
+	 * Get the program name so that error messages can use it.
+	 */
+	Prog = Basename (argv[0]);
+
+	sanitize_env ();
+	(void) setlocale (LC_ALL, "");
+	(void) bindtextdomain (PACKAGE, LOCALEDIR);
+	(void) textdomain (PACKAGE);
+
+	process_root_flag ("-R", argc, argv);
+
+#ifdef WITH_AUDIT
+	audit_help_open ();
+#endif
+	OPENLOG ("chage");
+
+	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
+
+	process_flags (argc, argv);
+
+	check_perms ();
+
+	if (!spw_file_present ()) {
+		fprintf (stderr,
+		         _("%s: the shadow password file is not present\n"),
+		         Prog);
+		SYSLOG ((LOG_WARN, "can't find the shadow password file"));
+		closelog ();
+		exit (E_SHADOW_NOTFOUND);
+	}
+
+	open_files (lflg);
+	/* Drop privileges */
+	if (lflg && (   (setregid (rgid, rgid) != 0)
+	             || (setreuid (ruid, ruid) != 0))) {
+		fprintf (stderr, _("%s: failed to drop privileges (%s)\n"),
+		         Prog, strerror (errno));
+		fail_exit (E_NOPERM);
+	}
+
+	pw = pw_locate (argv[optind]);
+	if (NULL == pw) {
+		fprintf (stderr, _("%s: user '%s' does not exist in %s\n"),
+		         Prog, argv[optind], pw_dbname ());
+		closelog ();
+		fail_exit (E_NOPERM);
+	}
+
+	STRFCPY (user_name, pw->pw_name);
+#ifdef WITH_TCB
+	if (shadowtcb_set_user (pw->pw_name) == SHADOWTCB_FAILURE) {
+		fail_exit (E_NOPERM);
+	}
+#endif
+	user_uid = pw->pw_uid;
+
+	sp = spw_locate (argv[optind]);
+	get_defaults (sp);
+
+	/*
+	 * Print out the expiration fields if the user has requested the
+	 * list option.
+	 */
+	if (lflg) {
+		if (!amroot && (ruid != user_uid)) {
+			fprintf (stderr, _("%s: Permission denied.\n"), Prog);
+			fail_exit (E_NOPERM);
+		}
+#ifdef WITH_AUDIT
+		audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
+		              "display aging info",
+		              user_name, (unsigned int) user_uid, 1);
+#endif
+		list_fields ();
+		fail_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"),
+		        user_name);
+		if (new_fields () == 0) {
+			fprintf (stderr, _("%s: error changing fields\n"),
+			         Prog);
+			fail_exit (E_NOPERM);
+		}
+#ifdef WITH_AUDIT
+		else {
+			audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
+			              "change all aging information",
+			              user_name, (unsigned int) user_uid, 1);
+		}
+#endif
+	} else {
+#ifdef WITH_AUDIT
+		if (Mflg) {
+			audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
+			              "change max age",
+			              user_name, (unsigned int) user_uid, 1);
+		}
+		if (mflg) {
+			audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
+			              "change min age",
+			              user_name, (unsigned int) user_uid, 1);
+		}
+		if (dflg) {
+			audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
+			              "change last change date",
+			              user_name, (unsigned int) user_uid, 1);
+		}
+		if (Wflg) {
+			audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
+			              "change passwd warning",
+			              user_name, (unsigned int) user_uid, 1);
+		}
+		if (Iflg) {
+			audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
+			              "change inactive days",
+			              user_name, (unsigned int) user_uid, 1);
+		}
+		if (Eflg) {
+			audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
+			              "change passwd expiration",
+			              user_name, (unsigned int) user_uid, 1);
+		}
+#endif
+	}
+
+	update_age (sp, pw);
+
+	close_files ();
+
+	SYSLOG ((LOG_INFO, "changed password expiry for %s", user_name));
+
+	closelog ();
+	exit (E_SUCCESS);
+}
+