1 /*- 2 * Copyright (c) 2002 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#3 $ 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 #include <security/pam_modules.h> 46 #include <security/pam_appl.h> 47 48 #ifndef _OPENPAM 49 static char password_prompt[] = "Password:"; 50 #endif 51 52 #ifndef PAM_EXTERN 53 #define PAM_EXTERN 54 #endif 55 56 PAM_EXTERN int 57 pam_sm_authenticate(pam_handle_t *pamh, int flags, 58 int argc, const char *argv[]) 59 { 60 #ifndef _OPENPAM 61 struct pam_conv *conv; 62 struct pam_message msg; 63 const struct pam_message *msgp; 64 struct pam_response *resp; 65 #endif 66 struct passwd *pwd; 67 const char *user; 68 char *crypt_password, *password; 69 int pam_err, retry; 70 71 /* identify user */ 72 if ((pam_err = pam_get_user(pamh, &user, NULL)) != PAM_SUCCESS) 73 return (pam_err); 74 if ((pwd = getpwnam(user)) == NULL) 75 return (PAM_USER_UNKNOWN); 76 77 /* get password */ 78 #ifndef _OPENPAM 79 pam_err = pam_get_item(pamh, PAM_CONV, (const void **)&conv); 80 if (pam_err != PAM_SUCCESS) 81 return (PAM_SYSTEM_ERR); 82 msg.msg_style = PAM_PROMPT_ECHO_OFF; 83 msg.msg = password_prompt; 84 msgp = &msg; 85 #endif 86 for (retry = 0; retry < 3; ++retry) { 87 #ifdef _OPENPAM 88 pam_err = pam_get_authtok(pamh, PAM_AUTHTOK, 89 (const char **)&password, NULL); 90 #else 91 resp = NULL; 92 pam_err = (*conv->conv)(1, &msgp, &resp, conv->appdata_ptr); 93 if (resp != NULL) { 94 if (pam_err == PAM_SUCCESS) 95 password = resp->resp; 96 else 97 free(resp->resp); 98 free(resp); 99 } 100 #endif 101 if (pam_err == PAM_SUCCESS) 102 break; 103 } 104 if (pam_err == PAM_CONV_ERR) 105 return (pam_err); 106 if (pam_err != PAM_SUCCESS) 107 return (PAM_AUTH_ERR); 108 109 /* compare passwords */ 110 if ((!pwd->pw_passwd[0] && (flags & PAM_DISALLOW_NULL_AUTHTOK)) || 111 (crypt_password = crypt(password, pwd->pw_passwd)) == NULL || 112 strcmp(crypt_password, pwd->pw_passwd) != 0) 113 pam_err = PAM_AUTH_ERR; 114 else 115 pam_err = PAM_SUCCESS; 116 #ifndef _OPENPAM 117 free(password); 118 #endif 119 return (pam_err); 120 } 121 122 PAM_EXTERN int 123 pam_sm_setcred(pam_handle_t *pamh, int flags, 124 int argc, const char *argv[]) 125 { 126 127 return (PAM_SUCCESS); 128 } 129 130 PAM_EXTERN int 131 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, 132 int argc, const char *argv[]) 133 { 134 135 return (PAM_SUCCESS); 136 } 137 138 PAM_EXTERN int 139 pam_sm_open_session(pam_handle_t *pamh, int flags, 140 int argc, const char *argv[]) 141 { 142 143 return (PAM_SUCCESS); 144 } 145 146 PAM_EXTERN int 147 pam_sm_close_session(pam_handle_t *pamh, int flags, 148 int argc, const char *argv[]) 149 { 150 151 return (PAM_SUCCESS); 152 } 153 154 PAM_EXTERN int 155 pam_sm_chauthtok(pam_handle_t *pamh, int flags, 156 int argc, const char *argv[]) 157 { 158 159 return (PAM_SERVICE_ERR); 160 } 161 162 #ifdef PAM_MODULE_ENTRY 163 PAM_MODULE_ENTRY("pam_unix"); 164 #endif 165