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" 39 RCSID("$OpenBSD: auth-passwd.c,v 1.27 2002/05/24 16:45:16 stevesk Exp $"); 40 41 #pragma ident "%Z%%M% %I% %E% SMI" 42 43 #include "packet.h" 44 #include "log.h" 45 #include "servconf.h" 46 #include "auth.h" 47 48 #if !defined(USE_PAM) && !defined(HAVE_OSF_SIA) 49 /* Don't need any of these headers for the PAM or SIA cases */ 50 # ifdef HAVE_CRYPT_H 51 # include <crypt.h> 52 # endif 53 # ifdef WITH_AIXAUTHENTICATE 54 # include <login.h> 55 # endif 56 # ifdef __hpux 57 # include <hpsecurity.h> 58 # include <prot.h> 59 # endif 60 # ifdef HAVE_SECUREWARE 61 # include <sys/security.h> 62 # include <sys/audit.h> 63 # include <prot.h> 64 # endif /* HAVE_SECUREWARE */ 65 # if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) 66 # include <shadow.h> 67 # endif 68 # if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) 69 # include <sys/label.h> 70 # include <sys/audit.h> 71 # include <pwdadj.h> 72 # endif 73 # if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) 74 # include "md5crypt.h" 75 # endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */ 76 77 # ifdef HAVE_CYGWIN 78 # undef ERROR 79 # include <windows.h> 80 # include <sys/cygwin.h> 81 # define is_winnt (GetVersion() < 0x80000000) 82 # endif 83 #endif /* !USE_PAM && !HAVE_OSF_SIA */ 84 85 extern ServerOptions options; 86 #ifdef WITH_AIXAUTHENTICATE 87 extern char *aixloginmsg; 88 #endif 89 90 /* 91 * Tries to authenticate the user using password. Returns true if 92 * authentication succeeds. 93 */ 94 int 95 auth_password(Authctxt *authctxt, const char *password) 96 { 97 #if defined(USE_PAM) 98 if (*password == '\0' && options.permit_empty_passwd == 0) 99 return 0; 100 return auth_pam_password(authctxt, password); 101 #elif defined(HAVE_OSF_SIA) 102 if (*password == '\0' && options.permit_empty_passwd == 0) 103 return 0; 104 return auth_sia_password(authctxt, password); 105 #else 106 struct passwd * pw = authctxt->pw; 107 char *encrypted_password; 108 char *pw_password; 109 char *salt; 110 #if defined(__hpux) || defined(HAVE_SECUREWARE) 111 struct pr_passwd *spw; 112 #endif /* __hpux || HAVE_SECUREWARE */ 113 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) 114 struct spwd *spw; 115 #endif 116 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) 117 struct passwd_adjunct *spw; 118 #endif 119 #ifdef WITH_AIXAUTHENTICATE 120 char *authmsg; 121 int authsuccess; 122 int reenter = 1; 123 #endif 124 125 /* deny if no user. */ 126 if (pw == NULL) 127 return 0; 128 #ifndef HAVE_CYGWIN 129 if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) 130 return 0; 131 #endif 132 if (*password == '\0' && options.permit_empty_passwd == 0) 133 return 0; 134 #ifdef KRB5 135 if (options.kerberos_authentication == 1) { 136 int ret = auth_krb5_password(authctxt, password); 137 if (ret == 1 || ret == 0) 138 return ret; 139 /* Fall back to ordinary passwd authentication. */ 140 } 141 #endif 142 #ifdef HAVE_CYGWIN 143 if (is_winnt) { 144 HANDLE hToken = cygwin_logon_user(pw, password); 145 146 if (hToken == INVALID_HANDLE_VALUE) 147 return 0; 148 cygwin_set_impersonation_token(hToken); 149 return 1; 150 } 151 #endif 152 #ifdef WITH_AIXAUTHENTICATE 153 authsuccess = (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0); 154 155 if (authsuccess) 156 /* We don't have a pty yet, so just label the line as "ssh" */ 157 if (loginsuccess(authctxt->user, 158 get_canonical_hostname(options.verify_reverse_mapping), 159 "ssh", &aixloginmsg) < 0) 160 aixloginmsg = NULL; 161 162 return(authsuccess); 163 #endif 164 #ifdef KRB4 165 if (options.kerberos_authentication == 1) { 166 int ret = auth_krb4_password(authctxt, password); 167 if (ret == 1 || ret == 0) 168 return ret; 169 /* Fall back to ordinary passwd authentication. */ 170 } 171 #endif 172 #ifdef BSD_AUTH 173 if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh", 174 (char *)password) == 0) 175 return 0; 176 else 177 return 1; 178 #endif 179 pw_password = pw->pw_passwd; 180 181 /* 182 * Various interfaces to shadow or protected password data 183 */ 184 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) 185 spw = getspnam(pw->pw_name); 186 if (spw != NULL) 187 pw_password = spw->sp_pwdp; 188 #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ 189 190 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) 191 if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL) 192 pw_password = spw->pwa_passwd; 193 #endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */ 194 195 #ifdef HAVE_SECUREWARE 196 if ((spw = getprpwnam(pw->pw_name)) != NULL) 197 pw_password = spw->ufld.fd_encrypt; 198 #endif /* HAVE_SECUREWARE */ 199 200 #if defined(__hpux) && !defined(HAVE_SECUREWARE) 201 if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL) 202 pw_password = spw->ufld.fd_encrypt; 203 #endif /* defined(__hpux) && !defined(HAVE_SECUREWARE) */ 204 205 /* Check for users with no password. */ 206 if ((password[0] == '\0') && (pw_password[0] == '\0')) 207 return 1; 208 209 if (pw_password[0] != '\0') 210 salt = pw_password; 211 else 212 salt = "xx"; 213 214 #ifdef HAVE_MD5_PASSWORDS 215 if (is_md5_salt(salt)) 216 encrypted_password = md5_crypt(password, salt); 217 else 218 encrypted_password = crypt(password, salt); 219 #else /* HAVE_MD5_PASSWORDS */ 220 # if defined(__hpux) && !defined(HAVE_SECUREWARE) 221 if (iscomsec()) 222 encrypted_password = bigcrypt(password, salt); 223 else 224 encrypted_password = crypt(password, salt); 225 # else 226 # ifdef HAVE_SECUREWARE 227 encrypted_password = bigcrypt(password, salt); 228 # else 229 encrypted_password = crypt(password, salt); 230 # endif /* HAVE_SECUREWARE */ 231 # endif /* __hpux && !defined(HAVE_SECUREWARE) */ 232 #endif /* HAVE_MD5_PASSWORDS */ 233 234 /* Authentication is accepted if the encrypted passwords are identical. */ 235 return (strcmp(encrypted_password, pw_password) == 0); 236 #endif /* !USE_PAM && !HAVE_OSF_SIA */ 237 } 238