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".
15 * Copyright (c) 1999 Dug Song. 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.
38 * Copyright (c) 2000 Markus Friedl. All rights reserved.
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
49 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
50 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
51 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
52 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
53 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
54 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
55 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
56 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
57 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
58 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
62 RCSID("$OpenBSD: auth-passwd.c,v 1.17 2000/09/07 20:27:49 deraadt Exp $");
64 #if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
71 #ifdef WITH_AIXAUTHENTICATE
75 # include <hpsecurity.h>
78 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
81 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
82 # include <sys/label.h>
83 # include <sys/audit.h>
86 #if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
87 # include "md5crypt.h"
88 #endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
93 #include <sys/cygwin.h>
94 #define is_winnt (GetVersion() < 0x80000000)
98 * Tries to authenticate the user using password. Returns true if
99 * authentication succeeds.
102 auth_password(struct passwd * pw, const char *password)
104 extern ServerOptions options;
105 char *encrypted_password;
109 struct pr_passwd *spw;
111 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
114 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
115 struct passwd_adjunct *spw;
117 #ifdef WITH_AIXAUTHENTICATE
123 /* deny if no user. */
127 if (pw->pw_uid == 0 && options.permit_root_login == 2)
132 * Empty password is only possible on NT if the user has _really_
133 * an empty password and authentication is done, though.
137 if (*password == '\0' && options.permit_empty_passwd == 0)
142 HANDLE hToken = cygwin_logon_user(pw, password);
144 if (hToken == INVALID_HANDLE_VALUE)
146 cygwin_set_impersonation_token(hToken);
152 if (options.skey_authentication == 1) {
153 int ret = auth_skey_password(pw, password);
154 if (ret == 1 || ret == 0)
156 /* Fall back to ordinary passwd authentication. */
160 #ifdef WITH_AIXAUTHENTICATE
161 return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
165 if (options.kerberos_authentication == 1) {
166 int ret = auth_krb4_password(pw, password);
167 if (ret == 1 || ret == 0)
169 /* Fall back to ordinary passwd authentication. */
174 pw_password = pw->pw_passwd;
177 * Various interfaces to shadow or protected password data
179 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
180 spw = getspnam(pw->pw_name);
182 pw_password = spw->sp_pwdp;
183 #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
184 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
185 if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
186 pw_password = spw->pwa_passwd;
187 #endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
189 if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
190 pw_password = spw->ufld.fd_encrypt;
191 #endif /* defined(__hpux) */
193 /* Check for users with no password. */
194 if ((password[0] == '\0') && (pw_password[0] == '\0'))
197 if (pw_password[0] != '\0')
202 #ifdef HAVE_MD5_PASSWORDS
203 if (is_md5_salt(salt))
204 encrypted_password = md5_crypt(password, salt);
206 encrypted_password = crypt(password, salt);
207 #else /* HAVE_MD5_PASSWORDS */
210 encrypted_password = bigcrypt(password, salt);
212 encrypted_password = crypt(password, salt);
214 encrypted_password = crypt(password, salt);
216 #endif /* HAVE_MD5_PASSWORDS */
218 /* Authentication is accepted if the encrypted passwords are identical. */
219 return (strcmp(encrypted_password, pw_password) == 0);
221 #endif /* !USE_PAM && !HAVE_OSF_SIA */