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 1.20 2001/01/21 19:05:42 markus Exp $");
41 #if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
49 #ifdef WITH_AIXAUTHENTICATE
53 # include <hpsecurity.h>
56 #ifdef HAVE_SCO_PROTECTED_PW
57 # include <sys/security.h>
58 # include <sys/audit.h>
60 #endif /* HAVE_SCO_PROTECTED_PW */
61 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
64 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
65 # include <sys/label.h>
66 # include <sys/audit.h>
69 #if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
70 # include "md5crypt.h"
71 #endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
76 #include <sys/cygwin.h>
77 #define is_winnt (GetVersion() < 0x80000000)
81 * Tries to authenticate the user using password. Returns true if
82 * authentication succeeds.
85 auth_password(struct passwd * pw, const char *password)
87 extern ServerOptions options;
88 char *encrypted_password;
92 struct pr_passwd *spw;
94 #ifdef HAVE_SCO_PROTECTED_PW
95 struct pr_passwd *spw;
96 #endif /* HAVE_SCO_PROTECTED_PW */
97 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
100 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
101 struct passwd_adjunct *spw;
103 #ifdef WITH_AIXAUTHENTICATE
109 /* deny if no user. */
113 if (pw->pw_uid == 0 && options.permit_root_login == 2)
118 * Empty password is only possible on NT if the user has _really_
119 * an empty password and authentication is done, though.
123 if (*password == '\0' && options.permit_empty_passwd == 0)
128 HANDLE hToken = cygwin_logon_user(pw, password);
130 if (hToken == INVALID_HANDLE_VALUE)
132 cygwin_set_impersonation_token(hToken);
137 #ifdef WITH_AIXAUTHENTICATE
138 return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
142 if (options.kerberos_authentication == 1) {
143 int ret = auth_krb4_password(pw, password);
144 if (ret == 1 || ret == 0)
146 /* Fall back to ordinary passwd authentication. */
151 pw_password = pw->pw_passwd;
154 * Various interfaces to shadow or protected password data
156 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
157 spw = getspnam(pw->pw_name);
159 pw_password = spw->sp_pwdp;
160 #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
162 #ifdef HAVE_SCO_PROTECTED_PW
163 spw = getprpwnam(pw->pw_name);
165 pw_password = spw->ufld.fd_encrypt;
166 #endif /* HAVE_SCO_PROTECTED_PW */
168 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
169 if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
170 pw_password = spw->pwa_passwd;
171 #endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
174 if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
175 pw_password = spw->ufld.fd_encrypt;
176 #endif /* defined(__hpux) */
178 /* Check for users with no password. */
179 if ((password[0] == '\0') && (pw_password[0] == '\0'))
182 if (pw_password[0] != '\0')
187 #ifdef HAVE_MD5_PASSWORDS
188 if (is_md5_salt(salt))
189 encrypted_password = md5_crypt(password, salt);
191 encrypted_password = crypt(password, salt);
192 #else /* HAVE_MD5_PASSWORDS */
195 encrypted_password = bigcrypt(password, salt);
197 encrypted_password = crypt(password, salt);
199 encrypted_password = crypt(password, salt);
201 #endif /* HAVE_MD5_PASSWORDS */
203 /* Authentication is accepted if the encrypted passwords are identical. */
204 return (strcmp(encrypted_password, pw_password) == 0);
206 #endif /* !USE_PAM && !HAVE_OSF_SIA */