shadow/src/dpasswd.c

/*
 * Copyright 1990 - 1993, 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: dpasswd.c,v 1.15 2002/01/05 15:41:43 kloczek Exp $")
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <signal.h>
#include <fcntl.h>
#include "prototypes.h"
#include "defines.h"
#include "dialup.h"
#define	DTMP	"/etc/d_passwd.tmp"
static int aflg = 0;
static int dflg = 0;
static char *Prog;

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

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

int main (int argc, char **argv)
{
	struct dialup *dial;
	struct dialup dent;
	struct stat sb;
	FILE *fp;
	char *sh = 0;
	char *cp;
	char pass[BUFSIZ];
	int fd;
	int found = 0;
	int opt;

	Prog = Basename (argv[0]);

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

	OPENLOG (Prog);

	while ((opt = getopt (argc, argv, "a:d:")) != EOF) {
		switch (opt) {
		case 'a':
			aflg++;
			sh = optarg;
			break;
		case 'd':
			dflg++;
			sh = optarg;
			break;
		default:
			usage ();
		}
	}
	if (!aflg && !dflg)
		aflg++;

	if (!sh) {
		if (optind >= argc)
			usage ();
		else
			sh = argv[optind];
	}
	if (aflg + dflg != 1)
		usage ();

	/*
	 * Add a new shell to the password file, or update an existing
	 * entry. Begin by getting an encrypted password for this shell.
	 */

	if (aflg) {
		int tries = 3;

		dent.du_shell = sh;
		dent.du_passwd = "";	/* XXX warning: const */

	      again:
		if (!(cp = getpass (_("Shell password: "))))
			exit (1);

		STRFCPY (pass, cp);
		strzero (cp);

		if (!(cp = getpass (_("re-enter Shell password: "))))
			exit (1);

		if (strcmp (pass, cp)) {
			strzero (pass);
			strzero (cp);
			fprintf (stderr,
				 _
				 ("%s: Passwords do not match, try again.\n"),
				 Prog);

			if (--tries)
				goto again;

			exit (1);
		}
		strzero (cp);
		dent.du_passwd = pw_encrypt (pass, crypt_make_salt ());
		strzero (pass);
	}

	/*
	 * Create the temporary file for the updated dialup password
	 * information to be placed into. Turn it into a (FILE *) for use by
	 * putduent().
	 */

	if ((fd = open (DTMP, O_CREAT | O_EXCL | O_RDWR, 0600)) < 0) {
		snprintf (pass, sizeof pass, _("%s: can't create %s"),
			  Prog, DTMP);
		perror (pass);
		exit (1);
	}
	if (!(fp = fdopen (fd, "r+"))) {
		snprintf (pass, sizeof pass, _("%s: can't open %s"), Prog,
			  DTMP);
		perror (pass);
		unlink (DTMP);
		exit (1);
	}

	/*
	 * Scan the dialup password file for the named entry, copying out
	 * other entries along the way. Copying stops when a match is found
	 * or the file runs out.
	 */

	while ((dial = getduent ())) {
		if (strcmp (dial->du_shell, sh) == 0) {
			found = 1;
			break;
		}
		if (putduent (dial, fp))
			goto failure;
	}

	/*
	 * To delete the entry, just don't copy it. To update the entry,
	 * output the modified version - works with new entries as well.
	 */

	if (dflg && !found) {
		fprintf (stderr, _("%s: Shell %s not found.\n"), Prog, sh);
		goto failure;
	}
	if (aflg)
		if (putduent (&dent, fp))
			goto failure;

	/*
	 * Now copy out the remaining entries. Flush and close the new file
	 * before doing anything nasty to the existing file.
	 */


	while ((dial = getduent ()))
		if (putduent (dial, fp))
			goto failure;

	if (fflush (fp))
		goto failure;

	fclose (fp);

	/*
	 * If the original file did not exist, we must create a new file
	 * with owner "root" and mode 400. Otherwise we copy the modes from
	 * the existing file to the new file.
	 *
	 * After this is done the new file will replace the old file.
	 */

	pwd_init ();

	if (!stat (DIALPWD, &sb)) {
		chown (DTMP, sb.st_uid, sb.st_gid);
		chmod (DTMP, sb.st_mode);
		unlink (DIALPWD);
	} else {
		chown (DTMP, 0, 0);
		chmod (DTMP, 0400);
	}
	if (!link (DTMP, DIALPWD))
		unlink (DTMP);

	if (aflg && !found)
		SYSLOG ((LOG_INFO, "added password for %s", sh));
	else if (aflg && found)
		SYSLOG ((LOG_INFO, "changed password for %s", sh));
	else if (dflg)
		SYSLOG ((LOG_INFO, "removed password for %s", sh));

	closelog ();
	sync ();
	exit (0);

      failure:
	unlink (DTMP);
	closelog ();
	exit (1);
}