1 /*- 2 * Copyright (c) 2001 Mark R V Murray 3 * All rights reserved. 4 * Copyright (c) 2001 Networks Associates Technologies, Inc. 5 * All rights reserved. 6 * 7 * Portions of this software were developed for the FreeBSD Project by 8 * ThinkSec AS and NAI Labs, the Security Research Division of Network 9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 10 * ("CBOSS"), as part of the 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/types.h> 41 #include <sys/stat.h> 42 #include <pwd.h> 43 #include <ttyent.h> 44 #include <string.h> 45 46 #define PAM_SM_AUTH 47 #define PAM_SM_ACCOUNT 48 #define PAM_SM_SESSION 49 #define PAM_SM_PASSWORD 50 51 #include <security/pam_appl.h> 52 #include <security/pam_modules.h> 53 #include <security/pam_mod_misc.h> 54 55 #define TTY_PREFIX "/dev/" 56 57 PAM_EXTERN int 58 pam_sm_authenticate(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 59 { 60 struct options options; 61 62 pam_std_option(&options, NULL, argc, argv); 63 64 PAM_LOG("Options processed"); 65 66 PAM_RETURN(PAM_IGNORE); 67 } 68 69 PAM_EXTERN 70 int 71 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 72 { 73 struct options options; 74 75 pam_std_option(&options, NULL, argc, argv); 76 77 PAM_LOG("Options processed"); 78 79 PAM_RETURN(PAM_SUCCESS); 80 } 81 82 PAM_EXTERN int 83 pam_sm_acct_mgmt(pam_handle_t *pamh __unused, int flags __unused, int argc ,const char **argv) 84 { 85 struct options options; 86 struct passwd *pwd; 87 struct ttyent *ty; 88 const char *user, *tty; 89 int pam_err; 90 91 pam_std_option(&options, NULL, argc, argv); 92 93 PAM_LOG("Options processed"); 94 95 pam_err = pam_get_user(pamh, &user, NULL); 96 if (pam_err != PAM_SUCCESS) 97 PAM_RETURN(pam_err); 98 if (user == NULL || (pwd = getpwnam(user)) == NULL) 99 PAM_RETURN(PAM_SERVICE_ERR); 100 101 PAM_LOG("Got user: %s", user); 102 103 /* If the user is not root, secure ttys do not apply */ 104 if (pwd->pw_uid != 0) 105 PAM_RETURN(PAM_SUCCESS); 106 107 pam_err = pam_get_item(pamh, PAM_TTY, (const void **)&tty); 108 if (pam_err != PAM_SUCCESS) 109 PAM_RETURN(pam_err); 110 111 PAM_LOG("Got TTY: %s", tty); 112 113 /* Ignore any "/dev/" on the PAM_TTY item */ 114 if (tty != NULL && strncmp(TTY_PREFIX, tty, sizeof(TTY_PREFIX)) == 0) { 115 PAM_LOG("WARNING: PAM_TTY starts with " TTY_PREFIX); 116 tty += sizeof(TTY_PREFIX) - 1; 117 } 118 119 if (tty != NULL && (ty = getttynam(tty)) != NULL && 120 (ty->ty_status & TTY_SECURE) != 0) 121 PAM_RETURN(PAM_SUCCESS); 122 123 PAM_VERBOSE_ERROR("Not on secure TTY"); 124 PAM_RETURN(PAM_AUTH_ERR); 125 } 126 127 PAM_EXTERN int 128 pam_sm_chauthtok(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 129 { 130 struct options options; 131 132 pam_std_option(&options, NULL, argc, argv); 133 134 PAM_LOG("Options processed"); 135 136 PAM_RETURN(PAM_IGNORE); 137 } 138 139 PAM_EXTERN int 140 pam_sm_open_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 141 { 142 struct options options; 143 144 pam_std_option(&options, NULL, argc, argv); 145 146 PAM_LOG("Options processed"); 147 148 PAM_RETURN(PAM_IGNORE); 149 } 150 151 PAM_EXTERN int 152 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 153 { 154 struct options options; 155 156 pam_std_option(&options, NULL, argc, argv); 157 158 PAM_LOG("Options processed"); 159 160 PAM_RETURN(PAM_IGNORE); 161 } 162 163 PAM_MODULE_ENTRY("pam_securetty"); 164