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 1.19 2001/01/18 16:59:59 markus Exp $");
41 #if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
50 #ifdef WITH_AIXAUTHENTICATE
54 # include <hpsecurity.h>
57 #ifdef HAVE_SCO_PROTECTED_PW
58 # include <sys/security.h>
59 # include <sys/audit.h>
61 #endif /* HAVE_SCO_PROTECTED_PW */
62 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
65 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
66 # include <sys/label.h>
67 # include <sys/audit.h>
70 #if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
71 # include "md5crypt.h"
72 #endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
77 #include <sys/cygwin.h>
78 #define is_winnt (GetVersion() < 0x80000000)
82 * Tries to authenticate the user using password. Returns true if
83 * authentication succeeds.
86 auth_password(struct passwd * pw, const char *password)
88 extern ServerOptions options;
89 char *encrypted_password;
93 struct pr_passwd *spw;
95 #ifdef HAVE_SCO_PROTECTED_PW
96 struct pr_passwd *spw;
97 #endif /* HAVE_SCO_PROTECTED_PW */
98 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
101 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
102 struct passwd_adjunct *spw;
104 #ifdef WITH_AIXAUTHENTICATE
110 /* deny if no user. */
114 if (pw->pw_uid == 0 && options.permit_root_login == 2)
119 * Empty password is only possible on NT if the user has _really_
120 * an empty password and authentication is done, though.
124 if (*password == '\0' && options.permit_empty_passwd == 0)
129 HANDLE hToken = cygwin_logon_user(pw, password);
131 if (hToken == INVALID_HANDLE_VALUE)
133 cygwin_set_impersonation_token(hToken);
138 #ifdef WITH_AIXAUTHENTICATE
139 return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
143 if (options.kerberos_authentication == 1) {
144 int ret = auth_krb4_password(pw, password);
145 if (ret == 1 || ret == 0)
147 /* Fall back to ordinary passwd authentication. */
152 pw_password = pw->pw_passwd;
155 * Various interfaces to shadow or protected password data
157 #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
158 spw = getspnam(pw->pw_name);
160 pw_password = spw->sp_pwdp;
161 #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
163 #ifdef HAVE_SCO_PROTECTED_PW
164 spw = getprpwnam(pw->pw_name);
166 pw_password = spw->ufld.fd_encrypt;
167 #endif /* HAVE_SCO_PROTECTED_PW */
169 #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
170 if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
171 pw_password = spw->pwa_passwd;
172 #endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
175 if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
176 pw_password = spw->ufld.fd_encrypt;
177 #endif /* defined(__hpux) */
179 /* Check for users with no password. */
180 if ((password[0] == '\0') && (pw_password[0] == '\0'))
183 if (pw_password[0] != '\0')
188 #ifdef HAVE_MD5_PASSWORDS
189 if (is_md5_salt(salt))
190 encrypted_password = md5_crypt(password, salt);
192 encrypted_password = crypt(password, salt);
193 #else /* HAVE_MD5_PASSWORDS */
196 encrypted_password = bigcrypt(password, salt);
198 encrypted_password = crypt(password, salt);
200 encrypted_password = crypt(password, salt);
202 #endif /* HAVE_MD5_PASSWORDS */
204 /* Authentication is accepted if the encrypted passwords are identical. */
205 return (strcmp(encrypted_password, pw_password) == 0);
207 #endif /* !USE_PAM && !HAVE_OSF_SIA */