auth-passwd.c revision 99748
1/* 2 * Author: Tatu Ylonen <ylo@cs.hut.fi> 3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 4 * All rights reserved 5 * Password authentication. This file contains the functions to check whether 6 * the password is valid for the user. 7 * 8 * As far as I am concerned, the code I have written for this software 9 * can be used freely for any purpose. Any derived versions of this 10 * software must be clearly marked as such, and if the derived work is 11 * incompatible with the protocol description in the RFC file, it must be 12 * called by a name other than "ssh" or "Secure Shell". 13 * 14 * Copyright (c) 1999 Dug Song. All rights reserved. 15 * Copyright (c) 2000 Markus Friedl. All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions 19 * are met: 20 * 1. Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 2. Redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38#include "includes.h" 39RCSID("$OpenBSD: auth-passwd.c,v 1.27 2002/05/24 16:45:16 stevesk Exp $"); 40RCSID("$FreeBSD: head/crypto/openssh/auth-passwd.c 99748 2002-07-10 23:05:13Z des $"); 41 42#include "packet.h" 43#include "log.h" 44#include "servconf.h" 45#include "auth.h" 46 47/* 48 * Do not try to use PAM for password authentication, as it is 49 * already (and far better) supported by the challenge/response 50 * authentication mechanism. 51 */ 52#undef USE_PAM 53 54#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA) 55/* Don't need any of these headers for the PAM or SIA cases */ 56# ifdef HAVE_CRYPT_H 57# include <crypt.h> 58# endif 59# ifdef WITH_AIXAUTHENTICATE 60# include <login.h> 61# endif 62# ifdef __hpux 63# include <hpsecurity.h> 64# include <prot.h> 65# endif 66# ifdef HAVE_SECUREWARE 67# include <sys/security.h> 68# include <sys/audit.h> 69# include <prot.h> 70# endif /* HAVE_SECUREWARE */ 71# if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) 72# include <shadow.h> 73# endif 74# if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) 75# include <sys/label.h> 76# include <sys/audit.h> 77# include <pwdadj.h> 78# endif 79# if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) 80# include "md5crypt.h" 81# endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */ 82 83# ifdef HAVE_CYGWIN 84# undef ERROR 85# include <windows.h> 86# include <sys/cygwin.h> 87# define is_winnt (GetVersion() < 0x80000000) 88# endif 89#endif /* !USE_PAM && !HAVE_OSF_SIA */ 90 91extern ServerOptions options; 92 93/* 94 * Tries to authenticate the user using password. Returns true if 95 * authentication succeeds. 96 */ 97int 98auth_password(Authctxt *authctxt, const char *password) 99{ 100#if defined(USE_PAM) 101 if (*password == '\0' && options.permit_empty_passwd == 0) 102 return 0; 103 return auth_pam_password(authctxt, password); 104#elif defined(HAVE_OSF_SIA) 105 if (*password == '\0' && options.permit_empty_passwd == 0) 106 return 0; 107 return auth_sia_password(authctxt, password); 108#else 109 struct passwd * pw = authctxt->pw; 110 char *encrypted_password; 111 char *pw_password; 112 char *salt; 113#if defined(__hpux) || defined(HAVE_SECUREWARE) 114 struct pr_passwd *spw; 115#endif /* __hpux || HAVE_SECUREWARE */ 116#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) 117 struct spwd *spw; 118#endif 119#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) 120 struct passwd_adjunct *spw; 121#endif 122#ifdef WITH_AIXAUTHENTICATE 123 char *authmsg; 124 char *loginmsg; 125 int reenter = 1; 126#endif 127 128 /* deny if no user. */ 129 if (pw == NULL) 130 return 0; 131#ifndef HAVE_CYGWIN 132 if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) 133 return 0; 134#endif 135 if (*password == '\0' && options.permit_empty_passwd == 0) 136 return 0; 137#ifdef KRB5 138 if (options.kerberos_authentication == 1) { 139 int ret = auth_krb5_password(authctxt, password); 140 if (ret == 1 || ret == 0) 141 return ret; 142 /* Fall back to ordinary passwd authentication. */ 143 } 144#endif 145#ifdef HAVE_CYGWIN 146 if (is_winnt) { 147 HANDLE hToken = cygwin_logon_user(pw, password); 148 149 if (hToken == INVALID_HANDLE_VALUE) 150 return 0; 151 cygwin_set_impersonation_token(hToken); 152 return 1; 153 } 154#endif 155#ifdef WITH_AIXAUTHENTICATE 156 return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0); 157#endif 158#ifdef KRB4 159 if (options.kerberos_authentication == 1) { 160 int ret = auth_krb4_password(authctxt, password); 161 if (ret == 1 || ret == 0) 162 return ret; 163 /* Fall back to ordinary passwd authentication. */ 164 } 165#endif 166#ifdef BSD_AUTH 167 if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh", 168 (char *)password) == 0) 169 return 0; 170 else 171 return 1; 172#endif 173 pw_password = pw->pw_passwd; 174 175 /* 176 * Various interfaces to shadow or protected password data 177 */ 178#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) 179 spw = getspnam(pw->pw_name); 180 if (spw != NULL) 181 pw_password = spw->sp_pwdp; 182#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ 183 184#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) 185 if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL) 186 pw_password = spw->pwa_passwd; 187#endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */ 188 189#ifdef HAVE_SECUREWARE 190 if ((spw = getprpwnam(pw->pw_name)) != NULL) 191 pw_password = spw->ufld.fd_encrypt; 192#endif /* HAVE_SECUREWARE */ 193 194#if defined(__hpux) && !defined(HAVE_SECUREWARE) 195 if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL) 196 pw_password = spw->ufld.fd_encrypt; 197#endif /* defined(__hpux) && !defined(HAVE_SECUREWARE) */ 198 199 /* Check for users with no password. */ 200 if ((password[0] == '\0') && (pw_password[0] == '\0')) 201 return 1; 202 203 if (pw_password[0] != '\0') 204 salt = pw_password; 205 else 206 salt = "xx"; 207 208#ifdef HAVE_MD5_PASSWORDS 209 if (is_md5_salt(salt)) 210 encrypted_password = md5_crypt(password, salt); 211 else 212 encrypted_password = crypt(password, salt); 213#else /* HAVE_MD5_PASSWORDS */ 214# if defined(__hpux) && !defined(HAVE_SECUREWARE) 215 if (iscomsec()) 216 encrypted_password = bigcrypt(password, salt); 217 else 218 encrypted_password = crypt(password, salt); 219# else 220# ifdef HAVE_SECUREWARE 221 encrypted_password = bigcrypt(password, salt); 222# else 223 encrypted_password = crypt(password, salt); 224# endif /* HAVE_SECUREWARE */ 225# endif /* __hpux && !defined(HAVE_SECUREWARE) */ 226#endif /* HAVE_MD5_PASSWORDS */ 227 228 /* Authentication is accepted if the encrypted passwords are identical. */ 229 return (strcmp(encrypted_password, pw_password) == 0); 230#endif /* !USE_PAM && !HAVE_OSF_SIA */ 231} 232