usr.bin/passwd/pam_passwd.c

   1 /*      $NetBSD: pam_passwd.c,v 1.3 2005/02/26 07:19:25 thorpej Exp $   */
   2
   3 /*-
   4  * Copyright (c) 2002 Networks Associates Technologies, Inc.
   5  * All rights reserved.
   6  *
   7  * This software was developed for the FreeBSD Project by ThinkSec AS and
   8  * NAI Labs, the Security Research Division of Network Associates, Inc.
   9  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
  10  * DARPA CHATS research program.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. The name of the author may not be used to endorse or promote
  21  *    products derived from this software without specific prior written
  22  *    permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #include <sys/cdefs.h>
  38 #ifdef __FreeBSD__
  39 __FBSDID("$FreeBSD: src/usr.bin/passwd/passwd.c,v 1.23 2003/04/18 21:27:09 nectar Exp $");
  40 #else
  41 __RCSID("$NetBSD: pam_passwd.c,v 1.3 2005/02/26 07:19:25 thorpej Exp $");
  42 #endif
  43
  44 #include <sys/param.h>
  45
  46 #include <err.h>
  47 #include <pwd.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <syslog.h>
  51 #include <unistd.h>
  52
  53 #include "extern.h"
  54
  55 #include <security/pam_appl.h>
  56 #include <security/openpam.h>
  57
  58 static pam_handle_t *pamh;
  59 static struct pam_conv pamc = {
  60         openpam_ttyconv,
  61         NULL
  62 };
  63
  64 #define pam_check(msg)                                                  \
  65 do {                                                                    \
  66         if (pam_err != PAM_SUCCESS) {                                   \
  67                 warnx("%s: %s", (msg), pam_strerror(pamh, pam_err));    \
  68                 goto end;                                               \
  69         }                                                               \
  70 } while (/*CONSTCOND*/0)
  71
  72 void
  73 pwpam_process(const char *username, int argc, char **argv)
  74 {
  75         int ch, pam_err;
  76         char hostname[MAXHOSTNAMELEN + 1];
  77
  78         while ((ch = getopt(argc, argv, "")) != -1) {
  79                 switch (ch) {
  80                 default:
  81                         usage();
  82                         /* NOTREACHED */
  83                 }
  84         }
  85
  86         argc -= optind;
  87         argv += optind;
  88
  89         switch (argc) {
  90         case 0:
  91                 /* username already provided */
  92                 break;
  93         case 1:
  94                 username = argv[0];
  95                 break;
  96         default:
  97                 usage();
  98                 /* NOTREACHED */
  99         }
 100
 101         (void)printf("Changing password for %s.\n", username);
 102
 103         /* initialize PAM -- always use the program name "passwd" */
 104         pam_err = pam_start("passwd", username, &pamc, &pamh);
 105         pam_check("unable to start PAM session");
 106
 107         pam_err = pam_set_item(pamh, PAM_TTY, ttyname(STDERR_FILENO));
 108         pam_check("unable to set TTY");
 109
 110         (void)gethostname(hostname, sizeof hostname);
 111         pam_err = pam_set_item(pamh, PAM_RHOST, hostname);
 112         pam_check("unable to set RHOST");
 113
 114         pam_err = pam_set_item(pamh, PAM_RUSER, getlogin());
 115         pam_check("unable to set RUSER");
 116
 117         /* set new password */
 118         pam_err = pam_chauthtok(pamh, 0);
 119         if (pam_err != PAM_SUCCESS)
 120                 printf("Unable to change auth token: %s\n",
 121                     pam_strerror(pamh, pam_err));
 122
 123  end:
 124         pam_end(pamh, pam_err);
 125         if (pam_err == PAM_SUCCESS)
 126                 return;
 127         exit(1);
 128 }