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 #define _BSD_SOURCE 41 42 #include <pwd.h> 43 #include <unistd.h> 44 #include <syslog.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 enum { 56 PAM_OPT_EVEN_ROOT = PAM_OPT_STD_MAX, 57 }; 58 59 static struct opttab other_options[] = { 60 { "even_root", PAM_OPT_EVEN_ROOT }, 61 { NULL, 0 } 62 }; 63 64 PAM_EXTERN int 65 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused, int argc, const char **argv) 66 { 67 struct options options; 68 struct passwd *pwd; 69 const char *luser; 70 int pam_err; 71 uid_t uid; 72 73 pam_std_option(&options, other_options, argc, argv); 74 75 PAM_LOG("Options processed"); 76 77 pam_err = pam_get_item(pamh, PAM_USER, (const void **)&luser); 78 if (pam_err != PAM_SUCCESS) 79 PAM_RETURN(pam_err); 80 if (luser == NULL || (pwd = getpwnam(luser)) == NULL) 81 PAM_RETURN(PAM_AUTH_ERR); 82 83 uid = getuid(); 84 if (uid == 0 && !pam_test_option(&options, PAM_OPT_EVEN_ROOT, NULL)) 85 PAM_RETURN(PAM_AUTH_ERR); 86 87 if (uid == (uid_t)pwd->pw_uid) 88 PAM_RETURN(PAM_SUCCESS); 89 90 PAM_VERBOSE_ERROR("Refused; source and target users differ"); 91 92 PAM_RETURN(PAM_AUTH_ERR); 93 } 94 95 PAM_EXTERN int 96 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 97 { 98 struct options options; 99 100 pam_std_option(&options, NULL, argc, argv); 101 102 PAM_LOG("Options processed"); 103 104 PAM_RETURN(PAM_SUCCESS); 105 } 106 107 PAM_EXTERN int 108 pam_sm_acct_mgmt(pam_handle_t *pamh __unused, int flags __unused, int argc ,const char **argv) 109 { 110 struct options options; 111 112 pam_std_option(&options, NULL, argc, argv); 113 114 PAM_LOG("Options processed"); 115 116 PAM_RETURN(PAM_IGNORE); 117 } 118 119 PAM_EXTERN int 120 pam_sm_chauthtok(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 121 { 122 struct options options; 123 124 pam_std_option(&options, NULL, argc, argv); 125 126 PAM_LOG("Options processed"); 127 128 PAM_RETURN(PAM_IGNORE); 129 } 130 131 PAM_EXTERN int 132 pam_sm_open_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 133 { 134 struct options options; 135 136 pam_std_option(&options, NULL, argc, argv); 137 138 PAM_LOG("Options processed"); 139 140 PAM_RETURN(PAM_IGNORE); 141 } 142 143 PAM_EXTERN int 144 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 145 { 146 struct options options; 147 148 pam_std_option(&options, NULL, argc, argv); 149 150 PAM_LOG("Options processed"); 151 152 PAM_RETURN(PAM_IGNORE); 153 } 154 155 PAM_MODULE_ENTRY("pam_self"); 156