[gssapi-openssh.git] / openssh / 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 1.29 2003/08/26 09:58:43 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)
		return 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)
		return 0;

#if defined(HAVE_OSF_SIA)
	return auth_sia_password(authctxt, password) && ok;
#else
# ifdef KRB5
	if (options.kerberos_authentication == 1) {
		int ret = auth_krb5_password(authctxt, password);
		if (ret == 1 || ret == 0)
			return ret && ok;
		/* 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 ok;
	}
# endif
# ifdef WITH_AIXAUTHENTICATE
	{
		char *authmsg = NULL;
		int reenter = 1;
		int authsuccess = 0;

		if (authenticate(pw->pw_name, password, &reenter,
		    &authmsg) == 0 && ok) {
			char *msg;
			char *host = 
			    (char *)get_canonical_hostname(options.use_dns);

			authsuccess = 1;
			aix_remove_embedded_newlines(authmsg);	

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

	        	/* No pty yet, so just label the line as "ssh" */
			aix_setauthdb(authctxt->user);
	        	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 ok;
# else
	{
	/* Just use the supplied fake password if authctxt is invalid */
	char *pw_password = authctxt->valid ? shadow_pw(pw) : pw->pw_passwd;

	/* Check for users with no password. */
	if (strcmp(pw_password, "") == 0 && strcmp(password, "") == 0)
		return ok;
	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) && ok;
	}

	}
# endif
#endif /* !HAVE_OSF_SIA */
}
Commit	Line	Data
3c0ef626	1	/*
	2	* Author: Tatu Ylonen <ylo@cs.hut.fi>
	3	* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
	4	* All rights reserved
	5	* Password authentication. This file contains the functions to check whether
	6	* the password is valid for the user.
	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	*
	14	* Copyright (c) 1999 Dug Song. All rights reserved.
	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.
	36	*/
	37
	38	#include "includes.h"
0fff78ff	39	RCSID("$OpenBSD: auth-passwd.c,v 1.29 2003/08/26 09:58:43 markus Exp $");
3c0ef626	40
3c0ef626	41	#include "packet.h"
3c0ef626	42	#include "log.h"
	43	#include "servconf.h"
	44	#include "auth.h"
41b2f314	45	#ifdef WITH_AIXAUTHENTICATE
0fff78ff	46	# include "buffer.h"
	47	# include "canohost.h"
	48	extern Buffer loginmsg;
41b2f314	49	#endif
3c0ef626	50
0fff78ff	51	extern ServerOptions options;
0fff78ff	52
3c0ef626	53	/*
	54	* Tries to authenticate the user using password. Returns true if
	55	* authentication succeeds.
	56	*/
	57	int
	58	auth_password(Authctxt authctxt, const char password)
	59	{
	60	struct passwd * pw = authctxt->pw;
7e772e1f	61	int ok = authctxt->valid;
3c0ef626	62
	63	/* deny if no user. */
	64	if (pw == NULL)
0fff78ff	65	return 0;
3c0ef626	66	#ifndef HAVE_CYGWIN
7e772e1f	67	if (pw && pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
7e772e1f	68	ok = 0;
3c0ef626	69	#endif
3c0ef626	70	if (*password == '\0' && options.permit_empty_passwd == 0)
7e772e1f	71	return 0;
0fff78ff	72
	73	#if defined(HAVE_OSF_SIA)
	74	return auth_sia_password(authctxt, password) && ok;
6a9b3198	75	#else
6a9b3198	76	# ifdef KRB5
3c0ef626	77	if (options.kerberos_authentication == 1) {
	78	int ret = auth_krb5_password(authctxt, password);
	79	if (ret == 1 \|\| ret == 0)
0fff78ff	80	return ret && ok;
3c0ef626	81	/* Fall back to ordinary passwd authentication. */
3c0ef626	82	}
6a9b3198	83	# endif
6a9b3198	84	# ifdef HAVE_CYGWIN
3c0ef626	85	if (is_winnt) {
	86	HANDLE hToken = cygwin_logon_user(pw, password);
	87
	88	if (hToken == INVALID_HANDLE_VALUE)
	89	return 0;
	90	cygwin_set_impersonation_token(hToken);
0fff78ff	91	return ok;
3c0ef626	92	}
6a9b3198	93	# endif
6a9b3198	94	# ifdef WITH_AIXAUTHENTICATE
0fff78ff	95	{
	96	char *authmsg = NULL;
	97	int reenter = 1;
	98	int authsuccess = 0;
	99
	100	if (authenticate(pw->pw_name, password, &reenter,
	101	&authmsg) == 0 && ok) {
	102	char *msg;
	103	char *host =
	104	(char *)get_canonical_hostname(options.use_dns);
	105
	106	authsuccess = 1;
	107	aix_remove_embedded_newlines(authmsg);
	108
	109	debug3("AIX/authenticate succeeded for user %s: %.100s",
	110	pw->pw_name, authmsg);
	111
	112	/* No pty yet, so just label the line as "ssh" */
	113	aix_setauthdb(authctxt->user);
	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	}
	122	}
	123	} else {
	124	debug3("AIX/authenticate failed for user %s: %.100s",
	125	pw->pw_name, authmsg);
	126	}
	127
	128	if (authmsg != NULL)
	129	xfree(authmsg);
	130
	131	return authsuccess;
3c0ef626	132	}
6a9b3198	133	# endif
6a9b3198	134	# ifdef BSD_AUTH
3c0ef626	135	if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
	136	(char *)password) == 0)
	137	return 0;
	138	else
0fff78ff	139	return ok;
	140	# else
	141	{
	142	/* Just use the supplied fake password if authctxt is invalid */
	143	char *pw_password = authctxt->valid ? shadow_pw(pw) : pw->pw_passwd;
3c0ef626	144
3c0ef626	145	/* Check for users with no password. */
acc3d05e	146	if (strcmp(pw_password, "") == 0 && strcmp(password, "") == 0)
0fff78ff	147	return ok;
	148	else {
	149	/* Encrypt the candidate password using the proper salt. */
	150	char *encrypted_password = xcrypt(password,
	151	(pw_password[0] && pw_password[1]) ? pw_password : "xx");
	152
	153	/*
	154	* Authentication is accepted if the encrypted passwords
	155	* are identical.
	156	*/
	157	return (strcmp(encrypted_password, pw_password) == 0) && ok;
	158	}
3c0ef626	159
0fff78ff	160	}
	161	# endif
	162	#endif /* !HAVE_OSF_SIA */
700318f3	163	}