1/* $NetBSD: pam_unix.c,v 1.8 2023/06/30 21:46:21 christos Exp $ */ 2 3/*- 4 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 5 * Copyright (c) 2004-2015 Dag-Erling Sm��rgrav 6 * All rights reserved. 7 * 8 * This software was developed for the FreeBSD Project by ThinkSec AS and 9 * Network Associates Laboratories, the Security Research Division of 10 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 11 * ("CBOSS"), as part of the DARPA CHATS research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. The name of the author may not be used to endorse or promote 22 * products derived from this software without specific prior written 23 * permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 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 58static char password_prompt[] = "Password:"; 59#endif 60 61#ifndef PAM_EXTERN 62#define PAM_EXTERN 63#endif 64 65PAM_EXTERN int 66pam_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 134PAM_EXTERN int 135pam_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 146PAM_EXTERN int 147pam_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 158PAM_EXTERN int 159pam_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 170PAM_EXTERN int 171pam_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 182PAM_EXTERN int 183pam_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 195PAM_MODULE_ENTRY("pam_unix"); 196#endif 197