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 1.23 2001/06/26 16:15:23 dugsong Exp $");
41 #if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
52 #ifdef WITH_AIXAUTHENTICATE
56 # include <hpsecurity.h>
59 #ifdef HAVE_SCO_PROTECTED_PW
60 # include <sys/security.h>
61 # include <sys/audit.h>
63 #endif /* HAVE_SCO_PROTECTED_PW */
64 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
67 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
68 # include <sys/label.h>
69 # include <sys/audit.h>
72 #if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
73 # include "md5crypt.h"
74 #endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
79 #include <sys/cygwin.h>
80 #define is_winnt (GetVersion() < 0x80000000)
84 extern ServerOptions options;
87 * Tries to authenticate the user using password. Returns true if
88 * authentication succeeds.
91 auth_password(Authctxt *authctxt, const char *password)
93 struct passwd * pw = authctxt->pw;
94 char *encrypted_password;
98 struct pr_passwd *spw;
100 #ifdef HAVE_SCO_PROTECTED_PW
101 struct pr_passwd *spw;
102 #endif /* HAVE_SCO_PROTECTED_PW */
103 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
106 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
107 struct passwd_adjunct *spw;
109 #ifdef WITH_AIXAUTHENTICATE
115 /* deny if no user. */
119 if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
124 * Empty password is only possible on NT if the user has _really_
125 * an empty password and authentication is done, though.
129 if (*password == '\0' && options.permit_empty_passwd == 0)
132 if (options.kerberos_authentication == 1) {
133 int ret = auth_krb5_password(authctxt, password);
134 if (ret == 1 || ret == 0)
136 /* Fall back to ordinary passwd authentication. */
141 HANDLE hToken = cygwin_logon_user(pw, password);
143 if (hToken == INVALID_HANDLE_VALUE)
145 cygwin_set_impersonation_token(hToken);
149 #ifdef WITH_AIXAUTHENTICATE
150 return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
153 if (options.kerberos_authentication == 1) {
154 int ret = auth_krb4_password(authctxt, password);
155 if (ret == 1 || ret == 0)
157 /* Fall back to ordinary passwd authentication. */
161 if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
162 (char *)password) == 0)
167 pw_password = pw->pw_passwd;
170 * Various interfaces to shadow or protected password data
172 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
173 spw = getspnam(pw->pw_name);
175 pw_password = spw->sp_pwdp;
176 #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
178 #ifdef HAVE_SCO_PROTECTED_PW
179 spw = getprpwnam(pw->pw_name);
181 pw_password = spw->ufld.fd_encrypt;
182 #endif /* HAVE_SCO_PROTECTED_PW */
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) */
190 if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
191 pw_password = spw->ufld.fd_encrypt;
192 #endif /* defined(__hpux) */
194 /* Check for users with no password. */
195 if ((password[0] == '\0') && (pw_password[0] == '\0'))
198 if (pw_password[0] != '\0')
203 #ifdef HAVE_MD5_PASSWORDS
204 if (is_md5_salt(salt))
205 encrypted_password = md5_crypt(password, salt);
207 encrypted_password = crypt(password, salt);
208 #else /* HAVE_MD5_PASSWORDS */
211 encrypted_password = bigcrypt(password, salt);
213 encrypted_password = crypt(password, salt);
215 encrypted_password = crypt(password, salt);
217 #endif /* HAVE_MD5_PASSWORDS */
219 /* Authentication is accepted if the encrypted passwords are identical. */
220 return (strcmp(encrypted_password, pw_password) == 0);
222 #endif /* !USE_PAM && !HAVE_OSF_SIA */