[openssh.git] / auth-passwd.c

/*
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 * Password authentication.  This file contains the functions to check whether
 * the password is valid for the user.
 *
 * As far as I am concerned, the code I have written for this software
 * can be used freely for any purpose.  Any derived versions of this
 * software must be clearly marked as such, and if the derived work is
 * incompatible with the protocol description in the RFC file, it must be
 * called by a name other than "ssh" or "Secure Shell".
 *
 * Copyright (c) 1999 Dug Song.  All rights reserved.
 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "includes.h"
RCSID("$OpenBSD: auth-passwd.c,v 1.28 2003/07/22 13:35:22 markus Exp $");

#include "packet.h"
#include "log.h"
#include "servconf.h"
#include "auth.h"
#ifdef WITH_AIXAUTHENTICATE
# include "buffer.h"
# include "canohost.h"
extern Buffer loginmsg;
#endif

extern ServerOptions options;

/*
 * Tries to authenticate the user using password.  Returns true if
 * authentication succeeds.
 */
int
auth_password(Authctxt *authctxt, const char *password)
{
	struct passwd * pw = authctxt->pw;
	int ok = authctxt->valid;

	/* deny if no user. */
	if (pw == NULL)
		ok = 0;
#ifndef HAVE_CYGWIN
	if (pw && pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
		ok = 0;
#endif
	if (*password == '\0' && options.permit_empty_passwd == 0)
		ok = 0;

	if (!ok)
		return 0;

#if defined(HAVE_OSF_SIA)
	return auth_sia_password(authctxt, password);
#else
# ifdef KRB5
	if (options.kerberos_authentication == 1) {
		int ret = auth_krb5_password(authctxt, password);
		if (ret == 1 || ret == 0)
			return ret;
		/* Fall back to ordinary passwd authentication. */
	}
# endif
# ifdef HAVE_CYGWIN
	if (is_winnt) {
		HANDLE hToken = cygwin_logon_user(pw, password);

		if (hToken == INVALID_HANDLE_VALUE)
			return (0);
		cygwin_set_impersonation_token(hToken);
		return (1);
	}
# endif
# ifdef WITH_AIXAUTHENTICATE
	{
		char *authmsg;
		int reenter = 1;
		int authsuccess = (authenticate(pw->pw_name, password, 
		    &reenter, &authmsg) == 0);
		aix_remove_embedded_newlines(authmsg);	

		if (authsuccess) {
			char *msg;
			char *host = 
			    (char *)get_canonical_hostname(options.use_dns);

			debug3("AIX/authenticate succeeded for user %s: %.100s",
				pw->pw_name, authmsg);

	        	/* No pty yet, so just label the line as "ssh" */
	        	if (loginsuccess(authctxt->user, host, "ssh", 
			    &msg) == 0){
				if (msg != NULL) {
					debug("%s: msg %s", __func__, msg);
					buffer_append(&loginmsg, msg, 
					    strlen(msg));
					xfree(msg);
				}
			}
		} else 
			debug3("AIX/authenticate failed for user %s: %.100s",
			    pw->pw_name, authmsg);

		if (authmsg != NULL)
			xfree(authmsg);

		return (authsuccess);
	}
# endif
# ifdef BSD_AUTH
	if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
	    (char *)password) == 0)
		return 0;
	else
		return 1;
# else
	{
	char *pw_password = shadow_pw(pw);

	/* Check for users with no password. */
	/* XXX Reverted back to OpenBSD, why was this changed again? */
	if (strcmp(pw_password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
		return 1;
	else {
		/* Encrypt the candidate password using the proper salt. */
		char *encrypted_password = xcrypt(password,
		    (pw_password[0] && pw_password[1]) ? pw_password : "xx");

		/*
		 * Authentication is accepted if the encrypted passwords
		 * are identical.
		 */
		return (strcmp(encrypted_password, pw_password) == 0);
	}

	}
# endif
#endif /* !HAVE_OSF_SIA */
}
Commit	Line	Data
8efc0c15	1	/*
5260325f	2	* Author: Tatu Ylonen <ylo@cs.hut.fi>
	3	* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
	4	* All rights reserved
5260325f	5	* Password authentication. This file contains the functions to check whether
5260325f	6	* the password is valid for the user.
bcbf86ec	7	*
	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".
	13	*
bcbf86ec	14	* Copyright (c) 1999 Dug Song. All rights reserved.
bcbf86ec	15	* Copyright (c) 2000 Markus Friedl. All rights reserved.
	16	*
	17	* Redistribution and use in source and binary forms, with or without
	18	* modification, are permitted provided that the following conditions
	19	* are met:
	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.
	25	*
	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.
5260325f	36	*/
8efc0c15	37
8efc0c15	38	#include "includes.h"
1c590258	39	RCSID("$OpenBSD: auth-passwd.c,v 1.28 2003/07/22 13:35:22 markus Exp $");
8efc0c15	40
8efc0c15	41	#include "packet.h"
42f11eb2	42	#include "log.h"
42f11eb2	43	#include "servconf.h"
59c97189	44	#include "auth.h"
7c6eb32f	45	#ifdef WITH_AIXAUTHENTICATE
	46	# include "buffer.h"
	47	# include "canohost.h"
	48	extern Buffer loginmsg;
	49	#endif
af774732	50
	51	extern ServerOptions options;
	52
5260325f	53	/*
	54	* Tries to authenticate the user using password. Returns true if
	55	* authentication succeeds.
	56	*/
6ae2364d	57	int
af774732	58	auth_password(Authctxt authctxt, const char password)
8efc0c15	59	{
f656b61e	60	struct passwd * pw = authctxt->pw;
68ece370	61	int ok = authctxt->valid;
8efc0c15	62
13f825f4	63	/* deny if no user. */
13f825f4	64	if (pw == NULL)
68ece370	65	ok = 0;
3c62e7eb	66	#ifndef HAVE_CYGWIN
68ece370	67	if (pw && pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
68ece370	68	ok = 0;
3c62e7eb	69	#endif
f656b61e	70	if (*password == '\0' && options.permit_empty_passwd == 0)
68ece370	71	ok = 0;
882a3870	72
68ece370	73	if (!ok)
68ece370	74	return 0;
7c6eb32f	75
7c6eb32f	76	#if defined(HAVE_OSF_SIA)
882a3870	77	return auth_sia_password(authctxt, password);
	78	#else
	79	# ifdef KRB5
ced49be2	80	if (options.kerberos_authentication == 1) {
	81	int ret = auth_krb5_password(authctxt, password);
	82	if (ret == 1 \|\| ret == 0)
	83	return ret;
	84	/* Fall back to ordinary passwd authentication. */
	85	}
882a3870	86	# endif
882a3870	87	# ifdef HAVE_CYGWIN
3c62e7eb	88	if (is_winnt) {
	89	HANDLE hToken = cygwin_logon_user(pw, password);
	90
	91	if (hToken == INVALID_HANDLE_VALUE)
c5a7d788	92	return (0);
3c62e7eb	93	cygwin_set_impersonation_token(hToken);
c5a7d788	94	return (1);
3c62e7eb	95	}
882a3870	96	# endif
882a3870	97	# ifdef WITH_AIXAUTHENTICATE
7c6eb32f	98	{
	99	char *authmsg;
	100	int reenter = 1;
	101	int authsuccess = (authenticate(pw->pw_name, password,
	102	&reenter, &authmsg) == 0);
	103	aix_remove_embedded_newlines(authmsg);
	104
	105	if (authsuccess) {
	106	char *msg;
	107	char *host =
	108	(char *)get_canonical_hostname(options.use_dns);
	109
	110	debug3("AIX/authenticate succeeded for user %s: %.100s",
	111	pw->pw_name, authmsg);
	112
	113	/* No pty yet, so just label the line as "ssh" */
	114	if (loginsuccess(authctxt->user, host, "ssh",
	115	&msg) == 0){
	116	if (msg != NULL) {
	117	debug("%s: msg %s", __func__, msg);
	118	buffer_append(&loginmsg, msg,
	119	strlen(msg));
	120	xfree(msg);
	121	}
bc7dfc06	122	}
7c6eb32f	123	} else
	124	debug3("AIX/authenticate failed for user %s: %.100s",
	125	pw->pw_name, authmsg);
	126
	127	if (authmsg != NULL)
	128	xfree(authmsg);
b7c4a4cc	129
7c6eb32f	130	return (authsuccess);
7c6eb32f	131	}
882a3870	132	# endif
882a3870	133	# ifdef BSD_AUTH
ced49be2	134	if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
	135	(char *)password) == 0)
	136	return 0;
	137	else
	138	return 1;
7c6eb32f	139	# else
	140	{
	141	char *pw_password = shadow_pw(pw);
0bbfbdeb	142
0bbfbdeb	143	/* Check for users with no password. */
7c6eb32f	144	/* XXX Reverted back to OpenBSD, why was this changed again? */
7c6eb32f	145	if (strcmp(pw_password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
0bbfbdeb	146	return 1;
7c6eb32f	147	else {
	148	/* Encrypt the candidate password using the proper salt. */
	149	char *encrypted_password = xcrypt(password,
	150	(pw_password[0] && pw_password[1]) ? pw_password : "xx");
	151
	152	/*
	153	* Authentication is accepted if the encrypted passwords
	154	* are identical.
	155	*/
	156	return (strcmp(encrypted_password, pw_password) == 0);
	157	}
b2344d54	158
7c6eb32f	159	}
7c6eb32f	160	# endif
05114c74	161	#endif /* !HAVE_OSF_SIA */
fde58bd4	162	}