pam_opie.c revision 90229
1/*- 2 * Copyright 2000 James Bloom 3 * All rights reserved. 4 * Based upon code Copyright 1998 Juniper Networks, Inc. 5 * Copyright (c) 2001 Networks Associates Technologies, Inc. 6 * All rights reserved. 7 * Copyright (c) 2002 Networks Associates Technologies, Inc. 8 * All rights reserved. 9 * 10 * Portions of this software were developed for the FreeBSD Project by 11 * ThinkSec AS and NAI Labs, the Security Research Division of Network 12 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 13 * ("CBOSS"), as part of the DARPA CHATS research program. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. The name of the author may not be used to endorse or promote 24 * products derived from this software without specific prior written 25 * permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40#include <sys/cdefs.h> 41__FBSDID("$FreeBSD: head/lib/libpam/modules/pam_opie/pam_opie.c 90229 2002-02-05 06:08:26Z des $"); 42 43#include <sys/types.h> 44#include <opie.h> 45#include <pwd.h> 46#include <stdio.h> 47#include <string.h> 48#include <unistd.h> 49 50#define PAM_SM_AUTH 51#define PAM_SM_ACCOUNT 52#define PAM_SM_SESSION 53#define PAM_SM_PASSWORD 54 55#include <security/pam_appl.h> 56#include <security/pam_modules.h> 57#include <security/pam_mod_misc.h> 58 59enum { 60 PAM_OPT_AUTH_AS_SELF = PAM_OPT_STD_MAX, 61 PAM_OPT_NO_FAKE_PROMPTS 62}; 63 64static struct opttab other_options[] = { 65 { "auth_as_self", PAM_OPT_AUTH_AS_SELF }, 66 { "no_fake_prompts", PAM_OPT_NO_FAKE_PROMPTS }, 67 { NULL, 0 } 68}; 69 70PAM_EXTERN int 71pam_sm_authenticate(pam_handle_t *pamh, int flags __unused, int argc, const char **argv) 72{ 73 struct opie opie; 74 struct options options; 75 struct passwd *pwd; 76 int retval, i; 77 const char *(promptstr[]) = { "%s\nPassword: ", "%s\nPassword [echo on]: "}; 78 char challenge[OPIE_CHALLENGE_MAX]; 79 char prompt[OPIE_CHALLENGE_MAX+22]; 80 char resp[OPIE_SECRET_MAX]; 81 const char *user; 82 const char *response; 83 84 pam_std_option(&options, other_options, argc, argv); 85 86 PAM_LOG("Options processed"); 87 88 user = NULL; 89 if (pam_test_option(&options, PAM_OPT_AUTH_AS_SELF, NULL)) { 90 if ((pwd = getpwnam(getlogin())) == NULL) 91 PAM_RETURN(PAM_AUTH_ERR); 92 user = pwd->pw_name; 93 } 94 else { 95 retval = pam_get_user(pamh, (const char **)&user, NULL); 96 if (retval != PAM_SUCCESS) 97 PAM_RETURN(retval); 98 } 99 100 PAM_LOG("Got user: %s", user); 101 102 /* 103 * Don't call the OPIE atexit() handler when our program exits, 104 * since the module has been unloaded and we will SEGV. 105 */ 106 opiedisableaeh(); 107 108 /* 109 * If the no_fake_prompts option was given, and the user 110 * doesn't have an OPIE key, just fail rather than present the 111 * user with a bogus OPIE challenge. 112 */ 113 /* XXX generates a const warning because of incorrect prototype */ 114 if (opiechallenge(&opie, (char *)user, challenge) != 0 && 115 pam_test_option(&options, PAM_OPT_NO_FAKE_PROMPTS, NULL)) 116 PAM_RETURN(PAM_AUTH_ERR); 117 118 /* 119 * It doesn't make sense to use a password that has already been 120 * typed in, since we haven't presented the challenge to the user 121 * yet, so clear the stored password. 122 */ 123 pam_set_item(pamh, PAM_AUTHTOK, NULL); 124 125 for (i = 0; i < 2; i++) { 126 snprintf(prompt, sizeof prompt, promptstr[i], challenge); 127 retval = pam_get_pass(pamh, &response, prompt, &options); 128 if (retval != PAM_SUCCESS) { 129 opieunlock(); 130 PAM_RETURN(retval); 131 } 132 133 PAM_LOG("Completed challenge %d: %s", i, response); 134 135 if (response[0] != '\0') 136 break; 137 138 /* Second time round, echo the password */ 139 pam_set_option(&options, PAM_OPT_ECHO_PASS); 140 } 141 142 /* We have to copy the response, because opieverify mucks with it. */ 143 strlcpy(resp, response, sizeof (resp)); 144 145 /* 146 * Opieverify is supposed to return -1 only if an error occurs. 147 * But it returns -1 even if the response string isn't in the form 148 * it expects. Thus we can't log an error and can only check for 149 * success or lack thereof. 150 */ 151 retval = opieverify(&opie, resp) == 0 ? PAM_SUCCESS : PAM_AUTH_ERR; 152 PAM_RETURN(retval); 153} 154 155PAM_EXTERN int 156pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 157{ 158 struct options options; 159 160 pam_std_option(&options, other_options, argc, argv); 161 162 PAM_LOG("Options processed"); 163 164 PAM_RETURN(PAM_SUCCESS); 165} 166 167PAM_EXTERN int 168pam_sm_acct_mgmt(pam_handle_t *pamh __unused, int flags __unused, int argc ,const char **argv) 169{ 170 struct options options; 171 172 pam_std_option(&options, NULL, argc, argv); 173 174 PAM_LOG("Options processed"); 175 176 PAM_RETURN(PAM_IGNORE); 177} 178 179PAM_EXTERN int 180pam_sm_chauthtok(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 181{ 182 struct options options; 183 184 pam_std_option(&options, NULL, argc, argv); 185 186 PAM_LOG("Options processed"); 187 188 PAM_RETURN(PAM_IGNORE); 189} 190 191PAM_EXTERN int 192pam_sm_open_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 193{ 194 struct options options; 195 196 pam_std_option(&options, NULL, argc, argv); 197 198 PAM_LOG("Options processed"); 199 200 PAM_RETURN(PAM_IGNORE); 201} 202 203PAM_EXTERN int 204pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 205{ 206 struct options options; 207 208 pam_std_option(&options, NULL, argc, argv); 209 210 PAM_LOG("Options processed"); 211 212 PAM_RETURN(PAM_IGNORE); 213} 214 215PAM_MODULE_ENTRY("pam_opie"); 216