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 1.27 2002/05/24 16:45:16 stevesk Exp $");
45 #include "openbsd-compat/xcrypt.h"
46 #ifdef WITH_AIXAUTHENTICATE
48 # include "canohost.h"
49 extern Buffer loginmsg;
52 extern ServerOptions options;
55 * Tries to authenticate the user using password. Returns true if
56 * authentication succeeds.
59 auth_password(Authctxt *authctxt, const char *password)
61 struct passwd * pw = authctxt->pw;
62 int ok = authctxt->valid;
64 /* deny if no user. */
68 if (pw && pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
71 if (*password == '\0' && options.permit_empty_passwd == 0)
77 #if defined(HAVE_OSF_SIA)
78 return auth_sia_password(authctxt, password);
81 if (options.kerberos_authentication == 1) {
82 int ret = auth_krb5_password(authctxt, password);
83 if (ret == 1 || ret == 0)
85 /* Fall back to ordinary passwd authentication. */
90 HANDLE hToken = cygwin_logon_user(pw, password);
92 if (hToken == INVALID_HANDLE_VALUE)
94 cygwin_set_impersonation_token(hToken);
98 # ifdef WITH_AIXAUTHENTICATE
102 int authsuccess = (authenticate(pw->pw_name, password,
103 &reenter, &authmsg) == 0);
104 aix_remove_embedded_newlines(authmsg);
109 (char *)get_canonical_hostname(options.use_dns);
111 debug3("AIX/authenticate succeeded for user %s: %.100s",
112 pw->pw_name, authmsg);
114 /* No pty yet, so just label the line as "ssh" */
115 if (loginsuccess(authctxt->user, host, "ssh",
118 debug("%s: msg %s", __func__, msg);
119 buffer_append(&loginmsg, msg,
125 debug3("AIX/authenticate failed for user %s: %.100s",
126 pw->pw_name, authmsg);
131 return (authsuccess);
135 if (options.kerberos_authentication == 1) {
136 int ret = auth_krb4_password(authctxt, password);
137 if (ret == 1 || ret == 0)
139 /* Fall back to ordinary passwd authentication. */
143 if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
144 (char *)password) == 0)
150 char *pw_password = shadow_pw(pw);
152 /* Check for users with no password. */
153 /* XXX Reverted back to OpenBSD, why was this changed again? */
154 if (strcmp(pw_password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
157 /* Encrypt the candidate password using the proper salt. */
158 char *encrypted_password = xcrypt(password,
159 (pw_password[0] && pw_password[1]) ? pw_password : "xx");
162 * Authentication is accepted if the encrypted passwords
165 return (strcmp(encrypted_password, pw_password) == 0);
170 #endif /* !HAVE_OSF_SIA */