2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * Password authentication. This file contains the functions to check whether
6 * the password is valid for the user.
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".
14 * Copyright (c) 1999 Dug Song. All rights reserved.
15 * Copyright (c) 2000 Markus Friedl. All rights reserved.
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
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.
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.
39 RCSID("$OpenBSD: auth-passwd.c,v 1.27 2002/05/24 16:45:16 stevesk Exp $");
40 RCSID("$FreeBSD: src/crypto/openssh/auth-passwd.c,v 1.2.2.7 2003/02/03 17:31:06 des Exp $");
41 RCSID("$DragonFly: src/crypto/openssh/Attic/auth-passwd.c,v 1.2 2003/06/17 04:24:36 dillon Exp $");
49 * Do not try to use PAM for password authentication, as it is
50 * already (and far better) supported by the challenge/response
51 * authentication mechanism.
55 #if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
56 /* Don't need any of these headers for the PAM or SIA cases */
60 # ifdef WITH_AIXAUTHENTICATE
64 # include <hpsecurity.h>
67 # ifdef HAVE_SECUREWARE
68 # include <sys/security.h>
69 # include <sys/audit.h>
71 # endif /* HAVE_SECUREWARE */
72 # if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
75 # if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
76 # include <sys/label.h>
77 # include <sys/audit.h>
80 # if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
81 # include "md5crypt.h"
82 # endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
87 # include <sys/cygwin.h>
88 # define is_winnt (GetVersion() < 0x80000000)
90 #endif /* !USE_PAM && !HAVE_OSF_SIA */
92 extern ServerOptions options;
93 #ifdef WITH_AIXAUTHENTICATE
94 extern char *aixloginmsg;
98 * Tries to authenticate the user using password. Returns true if
99 * authentication succeeds.
102 auth_password(Authctxt *authctxt, const char *password)
105 if (*password == '\0' && options.permit_empty_passwd == 0)
107 return auth_pam_password(authctxt, password);
108 #elif defined(HAVE_OSF_SIA)
109 if (*password == '\0' && options.permit_empty_passwd == 0)
111 return auth_sia_password(authctxt, password);
113 struct passwd * pw = authctxt->pw;
114 char *encrypted_password;
117 #if defined(__hpux) || defined(HAVE_SECUREWARE)
118 struct pr_passwd *spw;
119 #endif /* __hpux || HAVE_SECUREWARE */
120 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
123 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
124 struct passwd_adjunct *spw;
126 #ifdef WITH_AIXAUTHENTICATE
132 /* deny if no user. */
136 if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
139 if (*password == '\0' && options.permit_empty_passwd == 0)
142 if (options.kerberos_authentication == 1) {
143 int ret = auth_krb5_password(authctxt, password);
144 if (ret == 1 || ret == 0)
146 /* Fall back to ordinary passwd authentication. */
151 HANDLE hToken = cygwin_logon_user(pw, password);
153 if (hToken == INVALID_HANDLE_VALUE)
155 cygwin_set_impersonation_token(hToken);
159 #ifdef WITH_AIXAUTHENTICATE
160 authsuccess = (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
163 /* We don't have a pty yet, so just label the line as "ssh" */
164 if (loginsuccess(authctxt->user,
165 get_canonical_hostname(options.verify_reverse_mapping),
166 "ssh", &aixloginmsg) < 0)
172 if (options.kerberos_authentication == 1) {
173 int ret = auth_krb4_password(authctxt, password);
174 if (ret == 1 || ret == 0)
176 /* Fall back to ordinary passwd authentication. */
180 if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
181 (char *)password) == 0)
186 pw_password = pw->pw_passwd;
189 * Various interfaces to shadow or protected password data
191 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
192 spw = getspnam(pw->pw_name);
194 pw_password = spw->sp_pwdp;
195 #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
197 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
198 if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
199 pw_password = spw->pwa_passwd;
200 #endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
202 #ifdef HAVE_SECUREWARE
203 if ((spw = getprpwnam(pw->pw_name)) != NULL)
204 pw_password = spw->ufld.fd_encrypt;
205 #endif /* HAVE_SECUREWARE */
207 #if defined(__hpux) && !defined(HAVE_SECUREWARE)
208 if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
209 pw_password = spw->ufld.fd_encrypt;
210 #endif /* defined(__hpux) && !defined(HAVE_SECUREWARE) */
212 /* Check for users with no password. */
213 if ((password[0] == '\0') && (pw_password[0] == '\0'))
216 if (pw_password[0] != '\0')
221 #ifdef HAVE_MD5_PASSWORDS
222 if (is_md5_salt(salt))
223 encrypted_password = md5_crypt(password, salt);
225 encrypted_password = crypt(password, salt);
226 #else /* HAVE_MD5_PASSWORDS */
227 # if defined(__hpux) && !defined(HAVE_SECUREWARE)
229 encrypted_password = bigcrypt(password, salt);
231 encrypted_password = crypt(password, salt);
233 # ifdef HAVE_SECUREWARE
234 encrypted_password = bigcrypt(password, salt);
236 encrypted_password = crypt(password, salt);
237 # endif /* HAVE_SECUREWARE */
238 # endif /* __hpux && !defined(HAVE_SECUREWARE) */
239 #endif /* HAVE_MD5_PASSWORDS */
241 /* Authentication is accepted if the encrypted passwords are identical. */
242 return (strcmp(encrypted_password, pw_password) == 0);
243 #endif /* !USE_PAM && !HAVE_OSF_SIA */