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 $"); 40 RCSID("$FreeBSD$"); 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 91 extern ServerOptions options; 92 #ifdef WITH_AIXAUTHENTICATE 93 extern char *aixloginmsg; 94 #endif 95 96 /* 97 * Tries to authenticate the user using password. Returns true if 98 * authentication succeeds. 99 */ 100 int 101 auth_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