/*
 * Copyright 1990 - 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>

#include "rcsid.h"
RCSID (PKG_VER "$Id: chpasswd.c,v 1.19 2004/10/11 06:26:40 kloczek Exp $")
#include <stdio.h>
#include "prototypes.h"
#include "defines.h"
#include <pwd.h>
#include <fcntl.h>
#include "pwio.h"
#ifdef	SHADOWPWD
#include "shadowio.h"
#endif
#include "nscd.h"
#ifdef USE_PAM
#include <security/pam_appl.h>
#include <security/pam_misc.h>
#include <pwd.h>
#endif				/* USE_PAM */
static char *Prog;
static int eflg = 0;

#ifdef SHADOWPWD
static int is_shadow_pwd;
#endif

extern char *l64a ();

/* local function prototypes */
static void usage (void);

/*
 * usage - display usage message and exit
 */

static void usage (void)
{
	fprintf (stderr, _("Usage: %s [-e]\n"), Prog);
	exit (1);
}

#ifdef USE_PAM
static struct pam_conv conv = {
	misc_conv,
	NULL
};
#endif				/* USE_PAM */

int main (int argc, char **argv)
{
	char buf[BUFSIZ];
	char *name;
	char *newpwd;
	char *cp;

#ifdef	SHADOWPWD
	const struct spwd *sp;
	struct spwd newsp;
#endif
	const struct passwd *pw;
	struct passwd newpw;
	int errors = 0;
	int line = 0;
	long now = time ((long *) 0) / (24L * 3600L);
	int ok;

#ifdef USE_PAM
	pam_handle_t *pamh = NULL;
	struct passwd *pampw;
	int retval;
#endif

	Prog = Basename (argv[0]);

	setlocale (LC_ALL, "");
	bindtextdomain (PACKAGE, LOCALEDIR);
	textdomain (PACKAGE);

	/* XXX - use getopt() */
	if (!(argc == 1 || (argc == 2 && !strcmp(argv[1], "-e"))))
		usage();
	if (argc == 2)
		eflg = 1;

#ifdef USE_PAM
	retval = PAM_SUCCESS;

	pampw = getpwuid (getuid ());
	if (pampw == NULL) {
		retval = PAM_USER_UNKNOWN;
	}

	if (retval == PAM_SUCCESS) {
		retval =
		    pam_start ("chpasswd", 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 (1);
	}
#endif				/* USE_PAM */

	/*
	 * Lock the password file and open it for reading. This will bring
	 * all of the entries into memory where they may be updated.
	 */

	if (!pw_lock ()) {
		fprintf (stderr, _("%s: can't lock password file\n"),
			 Prog);
		exit (1);
	}
	if (!pw_open (O_RDWR)) {
		fprintf (stderr, _("%s: can't open password file\n"),
			 Prog);
		pw_unlock ();
		exit (1);
	}
#ifdef SHADOWPWD
	is_shadow_pwd = spw_file_present ();
	if (is_shadow_pwd) {
		if (!spw_lock ()) {
			fprintf (stderr, _("%s: can't lock shadow file\n"),
				 Prog);
			pw_unlock ();
			exit (1);
		}
		if (!spw_open (O_RDWR)) {
			fprintf (stderr, _("%s: can't open shadow file\n"),
				 Prog);
			pw_unlock ();
			spw_unlock ();
			exit (1);
		}
	}
#endif

	/*
	 * Read each line, separating the user name from the password. The
	 * password entry for each user will be looked up in the appropriate
	 * file (shadow or passwd) and the password changed. For shadow
	 * files the last change date is set directly, for passwd files the
	 * last change date is set in the age only if aging information is
	 * present.
	 */

	while (fgets (buf, sizeof buf, stdin) != (char *) 0) {
		line++;
		if ((cp = strrchr (buf, '\n'))) {
			*cp = '\0';
		} else {
			fprintf (stderr, _("%s: line %d: line too long\n"),
				 Prog, line);
			errors++;
			continue;
		}

		/*
		 * The username 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;
		if ((cp = strchr (name, ':'))) {
			*cp++ = '\0';
		} else {
			fprintf (stderr,
				 _("%s: line %d: missing new password\n"),
				 Prog, line);
			errors++;
			continue;
		}
		newpwd = cp;
		if (!eflg)
			cp = pw_encrypt (newpwd, crypt_make_salt ());

		/*
		 * Get the password file entry for this user. The user must
		 * already exist.
		 */

		pw = pw_locate (name);
		if (!pw) {
			fprintf (stderr,
				 _("%s: line %d: unknown user %s\n"), Prog,
				 line, name);
			errors++;
			continue;
		}
#ifdef SHADOWPWD
		if (is_shadow_pwd)
			sp = spw_locate (name);
		else
			sp = NULL;
#endif

		/*
		 * The freshly encrypted new password is merged into the
		 * user's password file entry and the last password change
		 * date is set to the current date.
		 */

#ifdef SHADOWPWD
		if (sp) {
			newsp = *sp;
			newsp.sp_pwdp = cp;
			newsp.sp_lstchg = now;
		} else
#endif
		{
			newpw = *pw;
			newpw.pw_passwd = cp;
		}

		/* 
		 * The updated password file entry is then put back and will
		 * be written to the password file later, after all the
		 * other entries have been updated as well.
		 */

#ifdef SHADOWPWD
		if (sp)
			ok = spw_update (&newsp);
		else
#endif
			ok = pw_update (&newpw);

		if (!ok) {
			fprintf (stderr,
				 _
				 ("%s: line %d: cannot update password entry\n"),
				 Prog, line);
			errors++;
			continue;
		}
	}

	/*
	 * Any detected errors will cause the entire set of changes to be
	 * aborted. Unlocking the password 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 (errors) {
		fprintf (stderr,
			 _("%s: error detected, changes ignored\n"), Prog);
#ifdef SHADOWPWD
		if (is_shadow_pwd)
			spw_unlock ();
#endif
		pw_unlock ();
		exit (1);
	}
#ifdef SHADOWPWD
	if (is_shadow_pwd) {
		if (!spw_close ()) {
			fprintf (stderr,
				 _("%s: error updating shadow file\n"),
				 Prog);
			pw_unlock ();
			exit (1);
		}
		spw_unlock ();
	}
#endif
	if (!pw_close ()) {
		fprintf (stderr, _("%s: error updating password file\n"),
			 Prog);
		exit (1);
	}

	nscd_flush_cache ("passwd");

	pw_unlock ();

#ifdef USE_PAM
	if (retval == PAM_SUCCESS) {
		retval = pam_chauthtok (pamh, 0);
		if (retval != PAM_SUCCESS) {
			pam_end (pamh, retval);
		}
	}

	if (retval != PAM_SUCCESS) {
		fprintf (stderr, _("%s: PAM chauthtok failed\n"), Prog);
		exit (1);
	}

	if (retval == PAM_SUCCESS)
		pam_end (pamh, PAM_SUCCESS);
#endif				/* USE_PAM */

	return (0);
}