1 /*- 2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 3 * All rights reserved. 4 * 5 * This software was developed for the FreeBSD Project by ThinkSec AS and 6 * Network Associates Laboratories, the Security Research Division of 7 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 8 * ("CBOSS"), as part of the DARPA CHATS research program. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote 19 * products derived from this software without specific prior written 20 * permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $P4: //depot/projects/openpam/modules/pam_unix/pam_unix.c#5 $ 35 */ 36 37 #include <sys/param.h> 38 39 #include <pwd.h> 40 #include <stdlib.h> 41 #include <stdio.h> 42 #include <string.h> 43 #include <unistd.h> 44 45 #ifdef __GLIBC__ 46 #include <crypt.h> 47 #endif 48 49 #include <security/pam_modules.h> 50 #include <security/pam_appl.h> 51 52 #ifndef _OPENPAM 53 static char password_prompt[] = "Password:"; 54 #endif 55 56 #ifndef PAM_EXTERN 57 #define PAM_EXTERN 58 #endif 59 60 PAM_EXTERN int 61 pam_sm_authenticate(pam_handle_t *pamh, int flags, 62 int argc, const char *argv[]) 63 { 64 #ifndef _OPENPAM 65 struct pam_conv *conv; 66 struct pam_message msg; 67 const struct pam_message *msgp; 68 struct pam_response *resp; 69 #endif 70 struct passwd *pwd; 71 const char *user; 72 char *crypt_password, *password; 73 int pam_err, retry; 74 75 /* identify user */ 76 if ((pam_err = pam_get_user(pamh, &user, NULL)) != PAM_SUCCESS) 77 return (pam_err); 78 if ((pwd = getpwnam(user)) == NULL) 79 return (PAM_USER_UNKNOWN); 80 81 /* get password */ 82 #ifndef _OPENPAM 83 pam_err = pam_get_item(pamh, PAM_CONV, (const void **)&conv); 84 if (pam_err != PAM_SUCCESS) 85 return (PAM_SYSTEM_ERR); 86 msg.msg_style = PAM_PROMPT_ECHO_OFF; 87 msg.msg = password_prompt; 88 msgp = &msg; 89 #endif 90 for (retry = 0; retry < 3; ++retry) { 91 #ifdef _OPENPAM 92 pam_err = pam_get_authtok(pamh, PAM_AUTHTOK, 93 (const char **)&password, NULL); 94 #else 95 resp = NULL; 96 pam_err = (*conv->conv)(1, &msgp, &resp, conv->appdata_ptr); 97 if (resp != NULL) { 98 if (pam_err == PAM_SUCCESS) 99 password = resp->resp; 100 else 101 free(resp->resp); 102 free(resp); 103 } 104 #endif 105 if (pam_err == PAM_SUCCESS) 106 break; 107 } 108 if (pam_err == PAM_CONV_ERR) 109 return (pam_err); 110 if (pam_err != PAM_SUCCESS) 111 return (PAM_AUTH_ERR); 112 113 /* compare passwords */ 114 if ((!pwd->pw_passwd[0] && (flags & PAM_DISALLOW_NULL_AUTHTOK)) || 115 (crypt_password = crypt(password, pwd->pw_passwd)) == NULL || 116 strcmp(crypt_password, pwd->pw_passwd) != 0) 117 pam_err = PAM_AUTH_ERR; 118 else 119 pam_err = PAM_SUCCESS; 120 #ifndef _OPENPAM 121 free(password); 122 #endif 123 return (pam_err); 124 } 125 126 PAM_EXTERN int 127 pam_sm_setcred(pam_handle_t *pamh, int flags, 128 int argc, const char *argv[]) 129 { 130 131 return (PAM_SUCCESS); 132 } 133 134 PAM_EXTERN int 135 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, 136 int argc, const char *argv[]) 137 { 138 139 return (PAM_SUCCESS); 140 } 141 142 PAM_EXTERN int 143 pam_sm_open_session(pam_handle_t *pamh, int flags, 144 int argc, const char *argv[]) 145 { 146 147 return (PAM_SUCCESS); 148 } 149 150 PAM_EXTERN int 151 pam_sm_close_session(pam_handle_t *pamh, int flags, 152 int argc, const char *argv[]) 153 { 154 155 return (PAM_SUCCESS); 156 } 157 158 PAM_EXTERN int 159 pam_sm_chauthtok(pam_handle_t *pamh, int flags, 160 int argc, const char *argv[]) 161 { 162 163 return (PAM_SERVICE_ERR); 164 } 165 166 #ifdef PAM_MODULE_ENTRY 167 PAM_MODULE_ENTRY("pam_unix"); 168 #endif 169