1 /*- 2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 3 * Copyright (c) 2004-2015 Dag-Erling Smørgrav 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project by ThinkSec AS and 7 * Network Associates Laboratories, the Security Research Division of 8 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 9 * ("CBOSS"), as part of the DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The name of the author may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $OpenPAM: pam_unix.c 938 2017-04-30 21:34:42Z des $ 36 */ 37 38 #ifdef HAVE_CONFIG_H 39 # include "config.h" 40 #endif 41 42 #include <sys/param.h> 43 44 #include <pwd.h> 45 #include <stdlib.h> 46 #include <stdio.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 #ifdef HAVE_CRYPT_H 51 # include <crypt.h> 52 #endif 53 54 #include <security/pam_modules.h> 55 #include <security/pam_appl.h> 56 57 #ifndef OPENPAM 58 static char password_prompt[] = "Password:"; 59 #endif 60 61 #ifndef PAM_EXTERN 62 #define PAM_EXTERN 63 #endif 64 65 PAM_EXTERN int 66 pam_sm_authenticate(pam_handle_t *pamh, int flags, 67 int argc, const char *argv[]) 68 { 69 #ifndef OPENPAM 70 struct pam_conv *conv; 71 struct pam_message msg; 72 const struct pam_message *msgp; 73 struct pam_response *resp; 74 #endif 75 struct passwd *pwd; 76 const char *user; 77 const char *crypt_password, *password; 78 int pam_err, retry; 79 80 (void)argc; 81 (void)argv; 82 83 /* identify user */ 84 if ((pam_err = pam_get_user(pamh, &user, NULL)) != PAM_SUCCESS) 85 return (pam_err); 86 if ((pwd = getpwnam(user)) == NULL) 87 return (PAM_USER_UNKNOWN); 88 89 /* get password */ 90 #ifndef OPENPAM 91 pam_err = pam_get_item(pamh, PAM_CONV, (const void **)&conv); 92 if (pam_err != PAM_SUCCESS) 93 return (PAM_SYSTEM_ERR); 94 msg.msg_style = PAM_PROMPT_ECHO_OFF; 95 msg.msg = password_prompt; 96 msgp = &msg; 97 #endif 98 for (retry = 0; retry < 3; ++retry) { 99 #ifdef OPENPAM 100 pam_err = pam_get_authtok(pamh, PAM_AUTHTOK, 101 &password, NULL); 102 #else 103 resp = NULL; 104 pam_err = (*conv->conv)(1, &msgp, &resp, conv->appdata_ptr); 105 if (resp != NULL) { 106 if (pam_err == PAM_SUCCESS) 107 password = resp->resp; 108 else 109 free(resp->resp); 110 free(resp); 111 } 112 #endif 113 if (pam_err == PAM_SUCCESS) 114 break; 115 } 116 if (pam_err == PAM_CONV_ERR) 117 return (pam_err); 118 if (pam_err != PAM_SUCCESS) 119 return (PAM_AUTH_ERR); 120 121 /* compare passwords */ 122 if ((!pwd->pw_passwd[0] && (flags & PAM_DISALLOW_NULL_AUTHTOK)) || 123 (crypt_password = crypt(password, pwd->pw_passwd)) == NULL || 124 strcmp(crypt_password, pwd->pw_passwd) != 0) 125 pam_err = PAM_AUTH_ERR; 126 else 127 pam_err = PAM_SUCCESS; 128 #ifndef OPENPAM 129 free(password); 130 #endif 131 return (pam_err); 132 } 133 134 PAM_EXTERN int 135 pam_sm_setcred(pam_handle_t *pamh, int flags, 136 int argc, const char *argv[]) 137 { 138 139 (void)pamh; 140 (void)flags; 141 (void)argc; 142 (void)argv; 143 return (PAM_SUCCESS); 144 } 145 146 PAM_EXTERN int 147 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, 148 int argc, const char *argv[]) 149 { 150 151 (void)pamh; 152 (void)flags; 153 (void)argc; 154 (void)argv; 155 return (PAM_SUCCESS); 156 } 157 158 PAM_EXTERN int 159 pam_sm_open_session(pam_handle_t *pamh, int flags, 160 int argc, const char *argv[]) 161 { 162 163 (void)pamh; 164 (void)flags; 165 (void)argc; 166 (void)argv; 167 return (PAM_SUCCESS); 168 } 169 170 PAM_EXTERN int 171 pam_sm_close_session(pam_handle_t *pamh, int flags, 172 int argc, const char *argv[]) 173 { 174 175 (void)pamh; 176 (void)flags; 177 (void)argc; 178 (void)argv; 179 return (PAM_SUCCESS); 180 } 181 182 PAM_EXTERN int 183 pam_sm_chauthtok(pam_handle_t *pamh, int flags, 184 int argc, const char *argv[]) 185 { 186 187 (void)pamh; 188 (void)flags; 189 (void)argc; 190 (void)argv; 191 return (PAM_SERVICE_ERR); 192 } 193 194 #ifdef PAM_MODULE_ENTRY 195 PAM_MODULE_ENTRY("pam_unix"); 196 #endif 197