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_modules.h> 52 #include <pam_mod_misc.h> 53 54 #define TTY_PREFIX "/dev/" 55 56 PAM_EXTERN int 57 pam_sm_authenticate(pam_handle_t * pamh, int flags __unused, int argc, const char **argv) 58 { 59 struct options options; 60 struct ttyent *ttyfileinfo; 61 struct passwd *pwd; 62 int retval; 63 const char *user, *ttyname; 64 65 pam_std_option(&options, NULL, argc, argv); 66 67 PAM_LOG("Options processed"); 68 69 retval = pam_get_user(pamh, &user, NULL); 70 if (retval != PAM_SUCCESS) 71 PAM_RETURN(retval); 72 73 PAM_LOG("Got user: %s", user); 74 75 retval = pam_get_item(pamh, PAM_TTY, (const void **)&ttyname); 76 if (retval != PAM_SUCCESS) 77 PAM_RETURN(retval); 78 79 PAM_LOG("Got TTY: %s", ttyname); 80 81 /* Ignore any "/dev/" on the PAM_TTY item */ 82 if (strncmp(TTY_PREFIX, ttyname, sizeof(TTY_PREFIX) - 1) == 0) 83 ttyname += sizeof(TTY_PREFIX) - 1; 84 85 /* If the user is not root, secure ttys do not apply */ 86 pwd = getpwnam(user); 87 if (pwd == NULL) 88 PAM_RETURN(PAM_IGNORE); 89 else if (pwd->pw_uid != 0) 90 PAM_RETURN(PAM_SUCCESS); 91 92 PAM_LOG("User is not root"); 93 94 ttyfileinfo = getttynam(ttyname); 95 if (ttyfileinfo == NULL) 96 PAM_RETURN(PAM_SERVICE_ERR); 97 98 PAM_LOG("Got ttyfileinfo"); 99 100 if (ttyfileinfo->ty_status & TTY_SECURE) 101 PAM_RETURN(PAM_SUCCESS); 102 else { 103 PAM_VERBOSE_ERROR("Not on secure TTY"); 104 PAM_RETURN(PAM_PERM_DENIED); 105 } 106 } 107 108 PAM_EXTERN 109 int 110 pam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused, int argc, const char **argv) 111 { 112 struct options options; 113 114 pam_std_option(&options, NULL, argc, argv); 115 116 PAM_LOG("Options processed"); 117 118 PAM_RETURN(PAM_SUCCESS); 119 } 120 121 PAM_EXTERN int 122 pam_sm_acct_mgmt(pam_handle_t *pamh __unused, int flags __unused, int argc ,const char **argv) 123 { 124 struct options options; 125 126 pam_std_option(&options, NULL, argc, argv); 127 128 PAM_LOG("Options processed"); 129 130 PAM_RETURN(PAM_IGNORE); 131 } 132 133 PAM_EXTERN int 134 pam_sm_chauthtok(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 135 { 136 struct options options; 137 138 pam_std_option(&options, NULL, argc, argv); 139 140 PAM_LOG("Options processed"); 141 142 PAM_RETURN(PAM_IGNORE); 143 } 144 145 PAM_EXTERN int 146 pam_sm_open_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 147 { 148 struct options options; 149 150 pam_std_option(&options, NULL, argc, argv); 151 152 PAM_LOG("Options processed"); 153 154 PAM_RETURN(PAM_IGNORE); 155 } 156 157 PAM_EXTERN int 158 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 159 { 160 struct options options; 161 162 pam_std_option(&options, NULL, argc, argv); 163 164 PAM_LOG("Options processed"); 165 166 PAM_RETURN(PAM_IGNORE); 167 } 168 169 PAM_MODULE_ENTRY("pam_securetty"); 170