auth-passwd.c revision 106130
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 106130 2002-10-29 10:16:02Z 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#ifdef WITH_AIXAUTHENTICATE 93extern char *aixloginmsg; 94#endif 95 96/* 97 * Tries to authenticate the user using password. Returns true if 98 * authentication succeeds. 99 */ 100int 101auth_password(Authctxt *authctxt, const char *password) 102{ 103#if defined(USE_PAM) 104 if (*password == '\0' && options.permit_empty_passwd == 0) 105 return 0; 106 return auth_pam_password(authctxt, password); 107#elif defined(HAVE_OSF_SIA) 108 if (*password == '\0' && options.permit_empty_passwd == 0) 109 return 0; 110 return auth_sia_password(authctxt, password); 111#else 112 struct passwd * pw = authctxt->pw; 113 char *encrypted_password; 114 char *pw_password; 115 char *salt; 116#if defined(__hpux) || defined(HAVE_SECUREWARE) 117 struct pr_passwd *spw; 118#endif /* __hpux || HAVE_SECUREWARE */ 119#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) 120 struct spwd *spw; 121#endif 122#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) 123 struct passwd_adjunct *spw; 124#endif 125#ifdef WITH_AIXAUTHENTICATE 126 char *authmsg; 127 int authsuccess; 128 int reenter = 1; 129#endif 130 131 /* deny if no user. */ 132 if (pw == NULL) 133 return 0; 134#ifndef HAVE_CYGWIN 135 if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) 136 return 0; 137#endif 138 if (*password == '\0' && options.permit_empty_passwd == 0) 139 return 0; 140#ifdef KRB5 141 if (options.kerberos_authentication == 1) { 142 int ret = auth_krb5_password(authctxt, password); 143 if (ret == 1 || ret == 0) 144 return ret; 145 /* Fall back to ordinary passwd authentication. */ 146 } 147#endif 148#ifdef HAVE_CYGWIN 149 if (is_winnt) { 150 HANDLE hToken = cygwin_logon_user(pw, password); 151 152 if (hToken == INVALID_HANDLE_VALUE) 153 return 0; 154 cygwin_set_impersonation_token(hToken); 155 return 1; 156 } 157#endif 158#ifdef WITH_AIXAUTHENTICATE 159 authsuccess = (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0); 160 161 if (authsuccess) 162 /* We don't have a pty yet, so just label the line as "ssh" */ 163 if (loginsuccess(authctxt->user, 164 get_canonical_hostname(options.verify_reverse_mapping), 165 "ssh", &aixloginmsg) < 0) 166 aixloginmsg = NULL; 167 168 return(authsuccess); 169#endif 170#ifdef KRB4 171 if (options.kerberos_authentication == 1) { 172 int ret = auth_krb4_password(authctxt, password); 173 if (ret == 1 || ret == 0) 174 return ret; 175 /* Fall back to ordinary passwd authentication. */ 176 } 177#endif 178#ifdef BSD_AUTH 179 if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh", 180 (char *)password) == 0) 181 return 0; 182 else 183 return 1; 184#endif 185 pw_password = pw->pw_passwd; 186 187 /* 188 * Various interfaces to shadow or protected password data 189 */ 190#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) 191 spw = getspnam(pw->pw_name); 192 if (spw != NULL) 193 pw_password = spw->sp_pwdp; 194#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ 195 196#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) 197 if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL) 198 pw_password = spw->pwa_passwd; 199#endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */ 200 201#ifdef HAVE_SECUREWARE 202 if ((spw = getprpwnam(pw->pw_name)) != NULL) 203 pw_password = spw->ufld.fd_encrypt; 204#endif /* HAVE_SECUREWARE */ 205 206#if defined(__hpux) && !defined(HAVE_SECUREWARE) 207 if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL) 208 pw_password = spw->ufld.fd_encrypt; 209#endif /* defined(__hpux) && !defined(HAVE_SECUREWARE) */ 210 211 /* Check for users with no password. */ 212 if ((password[0] == '\0') && (pw_password[0] == '\0')) 213 return 1; 214 215 if (pw_password[0] != '\0') 216 salt = pw_password; 217 else 218 salt = "xx"; 219 220#ifdef HAVE_MD5_PASSWORDS 221 if (is_md5_salt(salt)) 222 encrypted_password = md5_crypt(password, salt); 223 else 224 encrypted_password = crypt(password, salt); 225#else /* HAVE_MD5_PASSWORDS */ 226# if defined(__hpux) && !defined(HAVE_SECUREWARE) 227 if (iscomsec()) 228 encrypted_password = bigcrypt(password, salt); 229 else 230 encrypted_password = crypt(password, salt); 231# else 232# ifdef HAVE_SECUREWARE 233 encrypted_password = bigcrypt(password, salt); 234# else 235 encrypted_password = crypt(password, salt); 236# endif /* HAVE_SECUREWARE */ 237# endif /* __hpux && !defined(HAVE_SECUREWARE) */ 238#endif /* HAVE_MD5_PASSWORDS */ 239 240 /* Authentication is accepted if the encrypted passwords are identical. */ 241 return (strcmp(encrypted_password, pw_password) == 0); 242#endif /* !USE_PAM && !HAVE_OSF_SIA */ 243} 244