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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 6 2005-03-20 15:34:28Z bubulle $")
#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);
}

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