1/* $NetBSD: pam_passwd.c,v 1.5 2010/03/02 16:19:13 gdt 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 1.5 2010/03/02 16:19:13 gdt 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 58static pam_handle_t *pamh; 59static struct pam_conv pamc = { 60 openpam_ttyconv, 61 NULL 62}; 63 64#define pam_check(msg) \ 65do { \ 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 72void 73pwpam_process(const char *username, int argc, char **argv) 74{ 75 int ch, pam_err; 76 char hostname[MAXHOSTNAMELEN + 1]; 77 78 /* details about the invoking user for logging */ 79 const uid_t i_uid = getuid(); 80 const struct passwd *const i_pwd = getpwuid(i_uid); 81 const char *const i_username = (i_pwd && i_pwd->pw_name) 82 ? i_pwd->pw_name : "(null)"; 83 84 while ((ch = getopt(argc, argv, "")) != -1) { 85 switch (ch) { 86 default: 87 usage(); 88 /* NOTREACHED */ 89 } 90 } 91 92 argc -= optind; 93 argv += optind; 94 95 switch (argc) { 96 case 0: 97 /* username already provided */ 98 break; 99 case 1: 100 username = argv[0]; 101 break; 102 default: 103 usage(); 104 /* NOTREACHED */ 105 } 106 107 (void)printf("Changing password for %s.\n", username); 108 109 /* initialize PAM -- always use the program name "passwd" */ 110 pam_err = pam_start("passwd", username, &pamc, &pamh); 111 if (pam_err != PAM_SUCCESS) 112 errx(1, "unable to start PAM session: %s", 113 pam_strerror(NULL, pam_err)); 114 115 pam_err = pam_set_item(pamh, PAM_TTY, ttyname(STDERR_FILENO)); 116 pam_check("unable to set TTY"); 117 118 (void)gethostname(hostname, sizeof hostname); 119 pam_err = pam_set_item(pamh, PAM_RHOST, hostname); 120 pam_check("unable to set RHOST"); 121 122 pam_err = pam_set_item(pamh, PAM_RUSER, getlogin()); 123 pam_check("unable to set RUSER"); 124 125 /* set new password */ 126 pam_err = pam_chauthtok(pamh, 0); 127 if (pam_err != PAM_SUCCESS) { 128 if (pam_err == PAM_PERM_DENIED) { 129 syslog(LOG_AUTH | LOG_NOTICE, 130 "user %s (UID %lu) failed to change the " 131 "PAM authentication token of user %s: %s", 132 i_username, (unsigned long)i_uid, username, 133 pam_strerror(pamh, pam_err)); 134 } 135 printf("Unable to change auth token: %s\n", 136 pam_strerror(pamh, pam_err)); 137 } else { 138 syslog(LOG_AUTH | LOG_INFO, 139 "user %s (UID %lu) successfully changed the " 140 "PAM authentication token of user %s", 141 i_username, (unsigned long)i_uid, username); 142 } 143 144 end: 145 pam_end(pamh, pam_err); 146 if (pam_err == PAM_SUCCESS) 147 return; 148 exit(1); 149} 150