auth-passwd.c revision 113911
1244543Sbrooks/* 2244543Sbrooks * Author: Tatu Ylonen <ylo@cs.hut.fi> 3244543Sbrooks * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 4244543Sbrooks * All rights reserved 5244543Sbrooks * Password authentication. This file contains the functions to check whether 6244543Sbrooks * the password is valid for the user. 7244543Sbrooks * 8244543Sbrooks * As far as I am concerned, the code I have written for this software 9244543Sbrooks * can be used freely for any purpose. Any derived versions of this 10244543Sbrooks * software must be clearly marked as such, and if the derived work is 11244543Sbrooks * incompatible with the protocol description in the RFC file, it must be 12244543Sbrooks * called by a name other than "ssh" or "Secure Shell". 13244543Sbrooks * 14244543Sbrooks * Copyright (c) 1999 Dug Song. All rights reserved. 15244543Sbrooks * Copyright (c) 2000 Markus Friedl. All rights reserved. 16244543Sbrooks * 17244543Sbrooks * Redistribution and use in source and binary forms, with or without 18244543Sbrooks * modification, are permitted provided that the following conditions 19244543Sbrooks * are met: 20244543Sbrooks * 1. Redistributions of source code must retain the above copyright 21244543Sbrooks * notice, this list of conditions and the following disclaimer. 22244543Sbrooks * 2. Redistributions in binary form must reproduce the above copyright 23244543Sbrooks * notice, this list of conditions and the following disclaimer in the 24244543Sbrooks * documentation and/or other materials provided with the distribution. 25244543Sbrooks * 26244543Sbrooks * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 27244543Sbrooks * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28244543Sbrooks * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29244543Sbrooks * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 30244543Sbrooks * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 31244543Sbrooks * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32244543Sbrooks * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33244543Sbrooks * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34244543Sbrooks * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35244543Sbrooks * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36244543Sbrooks */ 37244543Sbrooks 38244543Sbrooks#include "includes.h" 39244543SbrooksRCSID("$OpenBSD: auth-passwd.c,v 1.27 2002/05/24 16:45:16 stevesk Exp $"); 40244543SbrooksRCSID("$FreeBSD: head/crypto/openssh/auth-passwd.c 113911 2003-04-23 17:13:13Z des $"); 41244543Sbrooks 42244543Sbrooks#include "packet.h" 43244543Sbrooks#include "log.h" 44244543Sbrooks#include "servconf.h" 45244543Sbrooks#include "auth.h" 46244543Sbrooks 47244543Sbrooks/* 48244543Sbrooks * Do not try to use PAM for password authentication, as it is 49244543Sbrooks * already (and far better) supported by the challenge/response 50244543Sbrooks * authentication mechanism. 51244543Sbrooks */ 52244543Sbrooks#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 struct passwd * pw = authctxt->pw; 104#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA) 105 char *encrypted_password; 106 char *pw_password; 107 char *salt; 108# if defined(__hpux) || defined(HAVE_SECUREWARE) 109 struct pr_passwd *spw; 110# endif /* __hpux || HAVE_SECUREWARE */ 111# if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) 112 struct spwd *spw; 113# endif 114# if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) 115 struct passwd_adjunct *spw; 116# endif 117# ifdef WITH_AIXAUTHENTICATE 118 char *authmsg; 119 int authsuccess; 120 int reenter = 1; 121# endif 122#endif /* !defined(USE_PAM) && !defined(HAVE_OSF_SIA) */ 123 124 /* deny if no user. */ 125 if (pw == NULL) 126 return 0; 127#ifndef HAVE_CYGWIN 128 if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) 129 return 0; 130#endif 131 if (*password == '\0' && options.permit_empty_passwd == 0) 132 return 0; 133 134#if defined(USE_PAM) 135 return auth_pam_password(authctxt, password); 136#elif defined(HAVE_OSF_SIA) 137 return auth_sia_password(authctxt, password); 138#else 139# ifdef KRB5 140 if (options.kerberos_authentication == 1) { 141 int ret = auth_krb5_password(authctxt, password); 142 if (ret == 1 || ret == 0) 143 return ret; 144 /* Fall back to ordinary passwd authentication. */ 145 } 146# endif 147# ifdef HAVE_CYGWIN 148 if (is_winnt) { 149 HANDLE hToken = cygwin_logon_user(pw, password); 150 151 if (hToken == INVALID_HANDLE_VALUE) 152 return 0; 153 cygwin_set_impersonation_token(hToken); 154 return 1; 155 } 156# endif 157# ifdef WITH_AIXAUTHENTICATE 158 authsuccess = (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0); 159 160 if (authsuccess) 161 /* We don't have a pty yet, so just label the line as "ssh" */ 162 if (loginsuccess(authctxt->user, 163 get_canonical_hostname(options.verify_reverse_mapping), 164 "ssh", &aixloginmsg) < 0) 165 aixloginmsg = NULL; 166 167 return(authsuccess); 168# endif 169# ifdef KRB4 170 if (options.kerberos_authentication == 1) { 171 int ret = auth_krb4_password(authctxt, password); 172 if (ret == 1 || ret == 0) 173 return ret; 174 /* Fall back to ordinary passwd authentication. */ 175 } 176# endif 177# ifdef BSD_AUTH 178 if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh", 179 (char *)password) == 0) 180 return 0; 181 else 182 return 1; 183# endif 184 pw_password = pw->pw_passwd; 185 186 /* 187 * Various interfaces to shadow or protected password data 188 */ 189# if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) 190 spw = getspnam(pw->pw_name); 191 if (spw != NULL) 192 pw_password = spw->sp_pwdp; 193# endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ 194 195# if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) 196 if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL) 197 pw_password = spw->pwa_passwd; 198# endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */ 199 200# ifdef HAVE_SECUREWARE 201 if ((spw = getprpwnam(pw->pw_name)) != NULL) 202 pw_password = spw->ufld.fd_encrypt; 203# endif /* HAVE_SECUREWARE */ 204 205# if defined(__hpux) && !defined(HAVE_SECUREWARE) 206 if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL) 207 pw_password = spw->ufld.fd_encrypt; 208# endif /* defined(__hpux) && !defined(HAVE_SECUREWARE) */ 209 210 /* Check for users with no password. */ 211 if ((password[0] == '\0') && (pw_password[0] == '\0')) 212 return 1; 213 214 if (pw_password[0] != '\0') 215 salt = pw_password; 216 else 217 salt = "xx"; 218 219# ifdef HAVE_MD5_PASSWORDS 220 if (is_md5_salt(salt)) 221 encrypted_password = md5_crypt(password, salt); 222 else 223 encrypted_password = crypt(password, salt); 224# else /* HAVE_MD5_PASSWORDS */ 225# if defined(__hpux) && !defined(HAVE_SECUREWARE) 226 if (iscomsec()) 227 encrypted_password = bigcrypt(password, salt); 228 else 229 encrypted_password = crypt(password, salt); 230# else 231# ifdef HAVE_SECUREWARE 232 encrypted_password = bigcrypt(password, salt); 233# else 234 encrypted_password = crypt(password, salt); 235# endif /* HAVE_SECUREWARE */ 236# endif /* __hpux && !defined(HAVE_SECUREWARE) */ 237# endif /* HAVE_MD5_PASSWORDS */ 238 239 /* Authentication is accepted if the encrypted passwords are identical. */ 240 return (strcmp(encrypted_password, pw_password) == 0); 241#endif /* !USE_PAM && !HAVE_OSF_SIA */ 242} 243