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 1.24 2002/03/04 12:43:06 markus Exp $");
46 #if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
47 /* Don't need any of these headers for the PAM or SIA cases */
51 # ifdef WITH_AIXAUTHENTICATE
55 # include <hpsecurity.h>
58 # ifdef HAVE_SCO_PROTECTED_PW
59 # include <sys/security.h>
60 # include <sys/audit.h>
62 # endif /* HAVE_SCO_PROTECTED_PW */
63 # if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
66 # if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
67 # include <sys/label.h>
68 # include <sys/audit.h>
71 # if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
72 # include "md5crypt.h"
73 # endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
78 # include <sys/cygwin.h>
79 # define is_winnt (GetVersion() < 0x80000000)
81 #endif /* !USE_PAM && !HAVE_OSF_SIA */
83 extern ServerOptions options;
86 * Tries to authenticate the user using password. Returns true if
87 * authentication succeeds.
90 auth_password(Authctxt *authctxt, const char *password)
93 if (*password == '\0' && options.permit_empty_passwd == 0)
95 return auth_pam_password(authctxt, password);
96 #elif defined(HAVE_OSF_SIA)
97 if (*password == '\0' && options.permit_empty_passwd == 0)
99 return auth_sia_password(authctxt, password);
101 struct passwd * pw = authctxt->pw;
102 char *encrypted_password;
106 struct pr_passwd *spw;
108 #ifdef HAVE_SCO_PROTECTED_PW
109 struct pr_passwd *spw;
110 #endif /* HAVE_SCO_PROTECTED_PW */
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 != PERMIT_YES)
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)
140 if (options.kerberos_authentication == 1) {
141 int ret = auth_krb5_password(authctxt, password);
142 if (ret == 1 || ret == 0)
144 /* Fall back to ordinary passwd authentication. */
149 HANDLE hToken = cygwin_logon_user(pw, password);
151 if (hToken == INVALID_HANDLE_VALUE)
153 cygwin_set_impersonation_token(hToken);
157 #ifdef WITH_AIXAUTHENTICATE
158 return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
161 if (options.kerberos_authentication == 1) {
162 int ret = auth_krb4_password(authctxt, password);
163 if (ret == 1 || ret == 0)
165 /* Fall back to ordinary passwd authentication. */
169 if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
170 (char *)password) == 0)
175 pw_password = pw->pw_passwd;
178 * Various interfaces to shadow or protected password data
180 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
181 spw = getspnam(pw->pw_name);
183 pw_password = spw->sp_pwdp;
184 #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
186 #ifdef HAVE_SCO_PROTECTED_PW
187 spw = getprpwnam(pw->pw_name);
189 pw_password = spw->ufld.fd_encrypt;
190 #endif /* HAVE_SCO_PROTECTED_PW */
192 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
193 if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
194 pw_password = spw->pwa_passwd;
195 #endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
198 if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
199 pw_password = spw->ufld.fd_encrypt;
200 #endif /* defined(__hpux) */
202 /* Check for users with no password. */
203 if ((password[0] == '\0') && (pw_password[0] == '\0'))
206 if (pw_password[0] != '\0')
211 #ifdef HAVE_MD5_PASSWORDS
212 if (is_md5_salt(salt))
213 encrypted_password = md5_crypt(password, salt);
215 encrypted_password = crypt(password, salt);
216 #else /* HAVE_MD5_PASSWORDS */
219 encrypted_password = bigcrypt(password, salt);
221 encrypted_password = crypt(password, salt);
223 # ifdef HAVE_SCO_PROTECTED_PW
224 encrypted_password = bigcrypt(password, salt);
226 encrypted_password = crypt(password, salt);
227 # endif /* HAVE_SCO_PROTECTED_PW */
229 #endif /* HAVE_MD5_PASSWORDS */
231 /* Authentication is accepted if the encrypted passwords are identical. */
232 return (strcmp(encrypted_password, pw_password) == 0);
233 #endif /* !USE_PAM && !HAVE_OSF_SIA */