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