1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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/param.h> 38 39 #include <err.h> 40 #include <pwd.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <syslog.h> 44 #include <unistd.h> 45 46 #include <security/pam_appl.h> 47 #include <security/openpam.h> 48 49 static pam_handle_t *pamh; 50 static struct pam_conv pamc = { 51 openpam_ttyconv, 52 NULL 53 }; 54 55 static char *yp_domain; 56 static char *yp_host; 57 58 static void 59 usage(void) 60 { 61 fprintf(stderr, "usage: passwd [-ly] [-d domain] [-h host] [user]\n"); 62 exit(1); 63 } 64 65 int 66 main(int argc, char *argv[]) 67 { 68 char hostname[MAXHOSTNAMELEN]; 69 struct passwd *pwd = NULL; /* Keep compiler happy. */ 70 int o, pam_err; 71 uid_t uid; 72 73 while ((o = getopt(argc, argv, "d:h:loy")) != -1) 74 switch (o) { 75 case 'd': 76 yp_domain = optarg; 77 break; 78 case 'h': 79 yp_host = optarg; 80 break; 81 case 'l': 82 case 'o': 83 case 'y': 84 /* compatibility */ 85 break; 86 default: 87 usage(); 88 } 89 90 argc -= optind; 91 argv += optind; 92 93 uid = getuid(); 94 95 switch (argc) { 96 case 0: 97 if ((pwd = getpwuid(uid)) == NULL) 98 errx(1, "who are you?"); 99 break; 100 case 1: 101 if ((pwd = getpwnam(*argv)) == NULL) 102 errx(1, "%s: no such user", *argv); 103 break; 104 default: 105 usage(); 106 } 107 108 if (uid != 0 && uid != pwd->pw_uid) 109 errx(1, "permission denied"); 110 111 /* check where the user's from */ 112 switch (pwd->pw_fields & _PWF_SOURCE) { 113 case _PWF_FILES: 114 fprintf(stderr, "Changing local password for %s\n", 115 pwd->pw_name); 116 break; 117 case _PWF_NIS: 118 fprintf(stderr, "Changing NIS password for %s\n", 119 pwd->pw_name); 120 break; 121 default: 122 /* XXX: Green men ought to be supported via PAM. */ 123 errx(1, 124 "Sorry, `passwd' can only change passwords for local or NIS users."); 125 } 126 127 #define pam_check(func) do { \ 128 if (pam_err != PAM_SUCCESS) { \ 129 if (pam_err == PAM_AUTH_ERR || pam_err == PAM_PERM_DENIED || \ 130 pam_err == PAM_AUTHTOK_RECOVERY_ERR) \ 131 warnx("sorry"); \ 132 else \ 133 warnx("%s(): %s", func, pam_strerror(pamh, pam_err)); \ 134 goto end; \ 135 } \ 136 } while (0) 137 138 /* initialize PAM */ 139 pam_err = pam_start("passwd", pwd->pw_name, &pamc, &pamh); 140 pam_check("pam_start"); 141 142 pam_err = pam_set_item(pamh, PAM_TTY, ttyname(STDERR_FILENO)); 143 pam_check("pam_set_item"); 144 gethostname(hostname, sizeof hostname); 145 pam_err = pam_set_item(pamh, PAM_RHOST, hostname); 146 pam_check("pam_set_item"); 147 pam_err = pam_set_item(pamh, PAM_RUSER, getlogin()); 148 pam_check("pam_set_item"); 149 150 /* set YP domain and host */ 151 pam_err = pam_set_data(pamh, "yp_domain", yp_domain, NULL); 152 pam_check("pam_set_data"); 153 pam_err = pam_set_data(pamh, "yp_server", yp_host, NULL); 154 pam_check("pam_set_data"); 155 156 /* set new password */ 157 pam_err = pam_chauthtok(pamh, 0); 158 pam_check("pam_chauthtok"); 159 160 end: 161 pam_end(pamh, pam_err); 162 exit(pam_err == PAM_SUCCESS ? 0 : 1); 163 } 164