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 1.25 2002/05/06 23:00:59 mouring 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_SECUREWARE
59 # include <sys/security.h>
60 # include <sys/audit.h>
62 # endif /* HAVE_SECUREWARE */
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 (*pw->pw_passwd == '\0' && options.permit_empty_passwd == 0)
95 return auth_pam_password(authctxt, password);
96 #elif defined(HAVE_OSF_SIA)
97 if (*pw->pw_passwd == '\0' && options.permit_empty_passwd == 0)
99 return auth_sia_password(authctxt, password);
101 struct passwd * pw = authctxt->pw;
102 char *encrypted_password;
105 #if defined(__hpux) || defined(HAVE_SECUREWARE)
106 struct pr_passwd *spw;
107 #endif /* __hpux || HAVE_SECUREWARE */
108 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
111 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
112 struct passwd_adjunct *spw;
114 #ifdef WITH_AIXAUTHENTICATE
120 /* deny if no user. */
124 if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
129 * Empty password is only possible on NT if the user has _really_
130 * an empty password and authentication is done, though.
134 if (*pw->pw_passwd == '\0' && options.permit_empty_passwd == 0)
137 if (options.kerberos_authentication == 1) {
138 int ret = auth_krb5_password(authctxt, password);
139 if (ret == 1 || ret == 0)
141 /* Fall back to ordinary passwd authentication. */
146 HANDLE hToken = cygwin_logon_user(pw, password);
148 if (hToken == INVALID_HANDLE_VALUE)
150 cygwin_set_impersonation_token(hToken);
154 #ifdef WITH_AIXAUTHENTICATE
155 return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
158 if (options.kerberos_authentication == 1) {
159 int ret = auth_krb4_password(authctxt, password);
160 if (ret == 1 || ret == 0)
162 /* Fall back to ordinary passwd authentication. */
166 if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
167 (char *)password) == 0)
172 pw_password = pw->pw_passwd;
175 * Various interfaces to shadow or protected password data
177 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
178 spw = getspnam(pw->pw_name);
180 pw_password = spw->sp_pwdp;
181 #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
183 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
184 if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
185 pw_password = spw->pwa_passwd;
186 #endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
188 #ifdef HAVE_SECUREWARE
189 if ((spw = getprpwnam(pw->pw_name)) != NULL)
190 pw_password = spw->ufld.fd_encrypt;
191 #endif /* HAVE_SECUREWARE */
193 #if defined(__hpux) && !defined(HAVE_SECUREWARE)
194 if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
195 pw_password = spw->ufld.fd_encrypt;
196 #endif /* defined(__hpux) && !defined(HAVE_SECUREWARE) */
198 /* Check for users with no password. */
199 if ((password[0] == '\0') && (pw_password[0] == '\0'))
202 if (pw_password[0] != '\0')
207 #ifdef HAVE_MD5_PASSWORDS
208 if (is_md5_salt(salt))
209 encrypted_password = md5_crypt(password, salt);
211 encrypted_password = crypt(password, salt);
212 #else /* HAVE_MD5_PASSWORDS */
213 # if defined(__hpux) && !defined(HAVE_SECUREWARE)
215 encrypted_password = bigcrypt(password, salt);
217 encrypted_password = crypt(password, salt);
219 # ifdef HAVE_SECUREWARE
220 encrypted_password = bigcrypt(password, salt);
222 encrypted_password = crypt(password, salt);
223 # endif /* HAVE_SECUREWARE */
224 # endif /* __hpux && !defined(HAVE_SECUREWARE) */
225 #endif /* HAVE_MD5_PASSWORDS */
227 /* Authentication is accepted if the encrypted passwords are identical. */
228 return (strcmp(encrypted_password, pw_password) == 0);
229 #endif /* !USE_PAM && !HAVE_OSF_SIA */