1 /*- 2 * Copyright (c) 2002 Networks Associates Technologies, Inc. 3 * All rights reserved. 4 * 5 * This software was developed for the FreeBSD Project by ThinkSec AS and 6 * NAI Labs, the Security Research Division of Network Associates, Inc. 7 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 8 * DARPA CHATS research program. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote 19 * products derived from this software without specific prior written 20 * permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 40 #include <err.h> 41 #include <pwd.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <syslog.h> 45 #include <unistd.h> 46 47 #include <security/pam_appl.h> 48 #include <security/openpam.h> 49 50 static pam_handle_t *pamh; 51 static struct pam_conv pamc = { 52 openpam_ttyconv, 53 NULL 54 }; 55 56 static char *yp_domain; 57 static char *yp_host; 58 59 static void 60 usage(void) 61 { 62 fprintf(stderr, "usage: passwd [-ly] [-d domain] [-h host] [user]\n"); 63 exit(1); 64 } 65 66 int 67 main(int argc, char *argv[]) 68 { 69 char hostname[MAXHOSTNAMELEN]; 70 struct passwd *pwd = NULL; /* Keep compiler happy. */ 71 int o, pam_err; 72 uid_t uid; 73 74 while ((o = getopt(argc, argv, "d:h:loy")) != -1) 75 switch (o) { 76 case 'd': 77 yp_domain = optarg; 78 break; 79 case 'h': 80 yp_host = optarg; 81 break; 82 case 'l': 83 case 'o': 84 case 'y': 85 /* compatibility */ 86 break; 87 default: 88 usage(); 89 } 90 91 argc -= optind; 92 argv += optind; 93 94 uid = getuid(); 95 96 switch (argc) { 97 case 0: 98 if ((pwd = getpwuid(uid)) == NULL) 99 errx(1, "who are you?"); 100 break; 101 case 1: 102 if ((pwd = getpwnam(*argv)) == NULL) 103 errx(1, "%s: no such user", *argv); 104 break; 105 default: 106 usage(); 107 } 108 109 if (uid != 0 && uid != pwd->pw_uid) 110 errx(1, "permission denied"); 111 112 /* check where the user's from */ 113 switch (pwd->pw_fields & _PWF_SOURCE) { 114 case _PWF_FILES: 115 fprintf(stderr, "Changing local password for %s\n", 116 pwd->pw_name); 117 break; 118 case _PWF_NIS: 119 fprintf(stderr, "Changing NIS password for %s\n", 120 pwd->pw_name); 121 break; 122 default: 123 /* XXX: Green men ought to be supported via PAM. */ 124 errx(1, 125 "Sorry, `passwd' can only change passwords for local or NIS users."); 126 } 127 128 #define pam_check(func) do { \ 129 if (pam_err != PAM_SUCCESS) { \ 130 if (pam_err == PAM_AUTH_ERR || pam_err == PAM_PERM_DENIED || \ 131 pam_err == PAM_AUTHTOK_RECOVERY_ERR) \ 132 warnx("sorry"); \ 133 else \ 134 warnx("%s(): %s", func, pam_strerror(pamh, pam_err)); \ 135 goto end; \ 136 } \ 137 } while (0) 138 139 /* initialize PAM */ 140 pam_err = pam_start("passwd", pwd->pw_name, &pamc, &pamh); 141 pam_check("pam_start"); 142 143 pam_err = pam_set_item(pamh, PAM_TTY, ttyname(STDERR_FILENO)); 144 pam_check("pam_set_item"); 145 gethostname(hostname, sizeof hostname); 146 pam_err = pam_set_item(pamh, PAM_RHOST, hostname); 147 pam_check("pam_set_item"); 148 pam_err = pam_set_item(pamh, PAM_RUSER, getlogin()); 149 pam_check("pam_set_item"); 150 151 /* set YP domain and host */ 152 pam_err = pam_set_data(pamh, "yp_domain", yp_domain, NULL); 153 pam_check("pam_set_data"); 154 pam_err = pam_set_data(pamh, "yp_server", yp_host, NULL); 155 pam_check("pam_set_data"); 156 157 /* set new password */ 158 pam_err = pam_chauthtok(pamh, 0); 159 pam_check("pam_chauthtok"); 160 161 end: 162 pam_end(pamh, pam_err); 163 exit(pam_err == PAM_SUCCESS ? 0 : 1); 164 } 165