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age.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>

#include <sys/types.h>
#include <stdio.h>
#include <time.h>
#include <errno.h>
#include "prototypes.h"
#include "defines.h"
#include <pwd.h>
#include <grp.h>

#if defined(SHADOWPWD)

#include "rcsid.h"
RCSID("$Id: age.c 6 2005-03-20 15:34:28Z bubulle $")

#ifndef PASSWD_PROGRAM
#define PASSWD_PROGRAM "/bin/passwd"
#endif

/*
 * expire - force password change if password expired
 *
 *    expire() calls /bin/passwd to change the user's password
 *    if it has expired.
 */

int
expire(const struct passwd *pw, const struct spwd *sp)
{
      int   status;
      int   child;
      int   pid;

      if (! sp)
            sp = pwd_to_spwd (pw);

      /*
       * See if the user's password has expired, and if so
       * force them to change their password.
       */

      switch (status = isexpired (pw, sp))
      {
            case 0:
                  return 0;
            case 1:
                  printf(_("Your password has expired."));
                  break;
            case 2:
                  printf(_("Your password is inactive."));
                  break;
            case 3:
                  printf(_("Your login has expired."));
                  break;
      }

      /*
       * Setting the maximum valid period to less than the minimum
       * valid period means that the minimum period will never
       * occur while the password is valid, so the user can never
       * change that password.
       */

      if (status > 1 || sp->sp_max < sp->sp_min)
      {
            puts(_("  Contact the system administrator.\n"));
            exit(1);
      }
      puts(_("  Choose a new password.\n"));
      fflush (stdout);

      /*
       * Close all the files so that unauthorized access won't
       * occur.  This needs to be done anyway because those files
       * might become stale after "passwd" is executed.
       */

      endspent ();
      endpwent ();
      endsgent ();
      endgrent ();

      /*
       * Execute the /bin/passwd command.  The exit status will be
       * examined to see what the result is.  If there are any
       * errors the routine will exit.  This forces the user to
       * change their password before being able to use the account.
       */

      if ((pid = fork ()) == 0) {
            int err;

            /*
             * Set the UID to be that of the user.  This causes
             * passwd to work just like it would had they executed
             * it from the command line while logged in.
             */
            if (setup_uid_gid(pw, 0))
                  _exit(126);

            execl(PASSWD_PROGRAM, PASSWD_PROGRAM, pw->pw_name, (char *)0);
            err = errno;
            perror("Can't execute " PASSWD_PROGRAM);
            _exit((err == ENOENT) ? 127 : 126);
      } else if (pid == -1) {
            perror("fork");
            exit(1);
      }
      while ((child = wait (&status)) != pid && child != -1)
            ;

      if (child == pid && status == 0)
            return 1;

      exit (1);
      /*NOTREACHED*/
}

/*
 * agecheck - see if warning is needed for password expiration
 *
 *    agecheck sees how many days until the user's password is going
 *    to expire and warns the user of the pending password expiration.
 */

void
agecheck(const struct passwd *pw, const struct spwd *sp)
{
      long  now = time ((long *) 0) / SCALE;
      long  remain;

      if (! sp)
            sp = pwd_to_spwd (pw);

      /*
       * The last, max, and warn fields must be supported or the
       * warning period cannot be calculated.
       */

      if (sp->sp_lstchg == -1 || sp->sp_max == -1 || sp->sp_warn == -1)
            return;
      if ((remain = (sp->sp_lstchg + sp->sp_max) - now) <= sp->sp_warn)
      {
            remain /= DAY/SCALE;
            if (remain > 1)
                  printf(_("Your password will expire in %ld days.\n"), remain);
            else if (remain == 1)
                  printf(_("Your password will expire tomorrow.\n"));
            else if (remain == 0)
                  printf(_("Your password will expire today.\n"));
      }
}
#endif /* SHADOWPWD */

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