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/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 42 #include <err.h> 43 #include <pwd.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <syslog.h> 47 #include <unistd.h> 48 49 #include <security/pam_appl.h> 50 #include <security/openpam.h> 51 52 static pam_handle_t *pamh; 53 static struct pam_conv pamc = { 54 openpam_ttyconv, 55 NULL 56 }; 57 58 static char *yp_domain; 59 static char *yp_host; 60 61 static void 62 usage(void) 63 { 64 fprintf(stderr, "usage: passwd [-ly] [-d domain] [-h host] [user]\n"); 65 exit(1); 66 } 67 68 int 69 main(int argc, char *argv[]) 70 { 71 char hostname[MAXHOSTNAMELEN]; 72 struct passwd *pwd = NULL; /* Keep compiler happy. */ 73 int o, pam_err; 74 uid_t uid; 75 76 while ((o = getopt(argc, argv, "d:h:loy")) != -1) 77 switch (o) { 78 case 'd': 79 yp_domain = optarg; 80 break; 81 case 'h': 82 yp_host = optarg; 83 break; 84 case 'l': 85 case 'o': 86 case 'y': 87 /* compatibility */ 88 break; 89 default: 90 usage(); 91 } 92 93 argc -= optind; 94 argv += optind; 95 96 uid = getuid(); 97 98 switch (argc) { 99 case 0: 100 if ((pwd = getpwuid(uid)) == NULL) 101 errx(1, "who are you?"); 102 break; 103 case 1: 104 if ((pwd = getpwnam(*argv)) == NULL) 105 errx(1, "%s: no such user", *argv); 106 break; 107 default: 108 usage(); 109 } 110 111 if (uid != 0 && uid != pwd->pw_uid) 112 errx(1, "permission denied"); 113 114 /* check where the user's from */ 115 switch (pwd->pw_fields & _PWF_SOURCE) { 116 case _PWF_FILES: 117 fprintf(stderr, "Changing local password for %s\n", 118 pwd->pw_name); 119 break; 120 case _PWF_NIS: 121 fprintf(stderr, "Changing NIS password for %s\n", 122 pwd->pw_name); 123 break; 124 default: 125 /* XXX: Green men ought to be supported via PAM. */ 126 errx(1, 127 "Sorry, `passwd' can only change passwords for local or NIS users."); 128 } 129 130 #define pam_check(func) do { \ 131 if (pam_err != PAM_SUCCESS) { \ 132 if (pam_err == PAM_AUTH_ERR || pam_err == PAM_PERM_DENIED || \ 133 pam_err == PAM_AUTHTOK_RECOVERY_ERR) \ 134 warnx("sorry"); \ 135 else \ 136 warnx("%s(): %s", func, pam_strerror(pamh, pam_err)); \ 137 goto end; \ 138 } \ 139 } while (0) 140 141 /* initialize PAM */ 142 pam_err = pam_start("passwd", pwd->pw_name, &pamc, &pamh); 143 pam_check("pam_start"); 144 145 pam_err = pam_set_item(pamh, PAM_TTY, ttyname(STDERR_FILENO)); 146 pam_check("pam_set_item"); 147 gethostname(hostname, sizeof hostname); 148 pam_err = pam_set_item(pamh, PAM_RHOST, hostname); 149 pam_check("pam_set_item"); 150 pam_err = pam_set_item(pamh, PAM_RUSER, getlogin()); 151 pam_check("pam_set_item"); 152 153 /* set YP domain and host */ 154 pam_err = pam_set_data(pamh, "yp_domain", yp_domain, NULL); 155 pam_check("pam_set_data"); 156 pam_err = pam_set_data(pamh, "yp_server", yp_host, NULL); 157 pam_check("pam_set_data"); 158 159 /* set new password */ 160 pam_err = pam_chauthtok(pamh, 0); 161 pam_check("pam_chauthtok"); 162 163 end: 164 pam_end(pamh, pam_err); 165 exit(pam_err == PAM_SUCCESS ? 0 : 1); 166 } 167