[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.
 *
 * 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.
 *
 *
 * 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 1.17 2000/09/07 20:27:49 deraadt Exp $");

#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)

#include "packet.h"
#include "ssh.h"
#include "servconf.h"
#include "xmalloc.h"

#ifdef WITH_AIXAUTHENTICATE
# include <login.h>
#endif
#ifdef HAVE_HPUX_TRUSTED_SYSTEM_PW
# include <hpsecurity.h>
# include <prot.h>
#endif
#ifdef HAVE_SHADOW_H
# include <shadow.h>
#endif
#ifdef HAVE_GETPWANAM
# include <sys/label.h>
# include <sys/audit.h>
# include <pwdadj.h>
#endif
#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
# include "md5crypt.h"
#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */

#ifdef HAVE_CYGWIN
#undef ERROR
#include <windows.h>
#include <sys/cygwin.h>
#define is_winnt       (GetVersion() < 0x80000000)
#endif

/*
 * Tries to authenticate the user using password.  Returns true if
 * authentication succeeds.
 */
int
auth_password(struct passwd * pw, const char *password)
{
	extern ServerOptions options;
	char *encrypted_password;
	char *pw_password;
	char *salt;
#ifdef HAVE_SHADOW_H
	struct spwd *spw;
#endif
#ifdef HAVE_GETPWANAM
	struct passwd_adjunct *spw;
#endif
# ifdef HAVE_HPUX_TRUSTED_SYSTEM_PW
	struct pr_passwd *prpw;
#endif
#ifdef WITH_AIXAUTHENTICATE
	char *authmsg;
	char *loginmsg;
	int reenter = 1;
#endif

	/* deny if no user. */
	if (pw == NULL)
		return 0;
#ifndef HAVE_CYGWIN
	if (pw->pw_uid == 0 && options.permit_root_login == 2)
		return 0;
#endif
#ifdef HAVE_CYGWIN
	/*
	 * Empty password is only possible on NT if the user has _really_
	 * an empty password and authentication is done, though.
	 */
        if (!is_winnt) 
#endif
	if (*password == '\0' && options.permit_empty_passwd == 0)
		return 0;

#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 SKEY
	if (options.skey_authentication == 1) {
		int ret = auth_skey_password(pw, password);
		if (ret == 1 || ret == 0)
			return ret;
		/* Fall back to ordinary passwd authentication. */
	}
#endif

#ifdef WITH_AIXAUTHENTICATE
	return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
#endif

#ifdef KRB4
	if (options.kerberos_authentication == 1) {
		int ret = auth_krb4_password(pw, password);
		if (ret == 1 || ret == 0)
			return ret;
		/* Fall back to ordinary passwd authentication. */
	}
#endif

# ifdef HAVE_HPUX_TRUSTED_SYSTEM_PW
	prpw = getprpwnam(pw->pw_name);
	pw_password = prpw->ufld.fd_encrypt;
#else
	pw_password = pw->pw_passwd;
#endif

	/* Check for users with no password. */
	if (strcmp(password, "") == 0 && strcmp(pw_password, "") == 0)
		return 1;

#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
	spw = getspnam(pw->pw_name);
	if (spw != NULL) 
	{
		/* Check for users with no password. */
		if (strcmp(password, "") == 0 && strcmp(spw->sp_pwdp, "") == 0)
			return 1;

		pw_password = spw->sp_pwdp;
	}
#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
	if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
	{
		/* Check for users with no password. */
		if (strcmp(password, "") == 0 && strcmp(spw->pwa_passwd, "") == 0)
			return 1;

		pw_password = spw->pwa_passwd;
	}
#endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */

	if (pw_password[0] != '\0')
		salt = pw_password;
	else
		salt = "xx";

#ifdef HAVE_MD5_PASSWORDS
	if (is_md5_salt(salt))
		encrypted_password = md5_crypt(password, salt);
	else
		encrypted_password = crypt(password, salt);
#else /* HAVE_MD5_PASSWORDS */    
# ifdef HAVE_HPUX_TRUSTED_SYSTEM_PW
	encrypted_password = bigcrypt(password, salt);
# else
	encrypted_password = crypt(password, salt);
# endif /* HAVE_HPUX_TRUSTED_SYSTEM_PW */
#endif /* HAVE_MD5_PASSWORDS */    

	/* Authentication is accepted if the encrypted passwords are identical. */
	return (strcmp(encrypted_password, pw_password) == 0);
}
#endif /* !USE_PAM && !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	*
	14	*
	15	* Copyright (c) 1999 Dug Song. 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	* Copyright (c) 2000 Markus Friedl. All rights reserved.
	39	*
	40	* Redistribution and use in source and binary forms, with or without
	41	* modification, are permitted provided that the following conditions
	42	* are met:
	43	* 1. Redistributions of source code must retain the above copyright
	44	* notice, this list of conditions and the following disclaimer.
	45	* 2. Redistributions in binary form must reproduce the above copyright
	46	* notice, this list of conditions and the following disclaimer in the
	47	* documentation and/or other materials provided with the distribution.
	48	*
	49	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	50	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	51	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	52	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	53	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	54	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	55	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	56	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	57	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	58	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
5260325f	59	*/
8efc0c15	60
8efc0c15	61	#include "includes.h"
bcbf86ec	62	RCSID("$OpenBSD: auth-passwd.c,v 1.17 2000/09/07 20:27:49 deraadt Exp $");
8efc0c15	63
4d33e531	64	#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
4d33e531	65
8efc0c15	66	#include "packet.h"
	67	#include "ssh.h"
	68	#include "servconf.h"
	69	#include "xmalloc.h"
b2344d54	70
4c40f834	71	#ifdef WITH_AIXAUTHENTICATE
2b763e31	72	# include <login.h>
	73	#endif
	74	#ifdef HAVE_HPUX_TRUSTED_SYSTEM_PW
	75	# include <hpsecurity.h>
	76	# include <prot.h>
4c40f834	77	#endif
b2344d54	78	#ifdef HAVE_SHADOW_H
d94aa2ae	79	# include <shadow.h>
caf3bc51	80	#endif
a423beaf	81	#ifdef HAVE_GETPWANAM
	82	# include <sys/label.h>
	83	# include <sys/audit.h>
	84	# include <pwdadj.h>
	85	#endif
d94aa2ae	86	#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
	87	# include "md5crypt.h"
	88	#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
caf3bc51	89
3c62e7eb	90	#ifdef HAVE_CYGWIN
	91	#undef ERROR
	92	#include <windows.h>
	93	#include <sys/cygwin.h>
	94	#define is_winnt (GetVersion() < 0x80000000)
	95	#endif
	96
5260325f	97	/*
	98	* Tries to authenticate the user using password. Returns true if
	99	* authentication succeeds.
	100	*/
6ae2364d	101	int
5260325f	102	auth_password(struct passwd * pw, const char *password)
8efc0c15	103	{
5260325f	104	extern ServerOptions options;
5260325f	105	char *encrypted_password;
f498ed15	106	char *pw_password;
f498ed15	107	char *salt;
b2344d54	108	#ifdef HAVE_SHADOW_H
5260325f	109	struct spwd *spw;
b2344d54	110	#endif
a423beaf	111	#ifdef HAVE_GETPWANAM
	112	struct passwd_adjunct *spw;
	113	#endif
7f8f5e00	114	# ifdef HAVE_HPUX_TRUSTED_SYSTEM_PW
	115	struct pr_passwd *prpw;
	116	#endif
4c40f834	117	#ifdef WITH_AIXAUTHENTICATE
	118	char *authmsg;
	119	char *loginmsg;
	120	int reenter = 1;
	121	#endif
8efc0c15	122
13f825f4	123	/* deny if no user. */
	124	if (pw == NULL)
	125	return 0;
3c62e7eb	126	#ifndef HAVE_CYGWIN
aa3378df	127	if (pw->pw_uid == 0 && options.permit_root_login == 2)
5260325f	128	return 0;
3c62e7eb	129	#endif
	130	#ifdef HAVE_CYGWIN
	131	/*
	132	* Empty password is only possible on NT if the user has _really_
	133	* an empty password and authentication is done, though.
	134	*/
	135	if (!is_winnt)
	136	#endif
aa3378df	137	if (*password == '\0' && options.permit_empty_passwd == 0)
5260325f	138	return 0;
8efc0c15	139
3c62e7eb	140	#ifdef HAVE_CYGWIN
	141	if (is_winnt) {
	142	HANDLE hToken = cygwin_logon_user(pw, password);
	143
	144	if (hToken == INVALID_HANDLE_VALUE)
	145	return 0;
	146	cygwin_set_impersonation_token(hToken);
	147	return 1;
	148	}
	149	#endif
	150
8efc0c15	151	#ifdef SKEY
5260325f	152	if (options.skey_authentication == 1) {
57112b5a	153	int ret = auth_skey_password(pw, password);
	154	if (ret == 1 \|\| ret == 0)
	155	return ret;
5260325f	156	/* Fall back to ordinary passwd authentication. */
5260325f	157	}
8efc0c15	158	#endif
4c40f834	159
	160	#ifdef WITH_AIXAUTHENTICATE
	161	return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
	162	#endif
	163
57112b5a	164	#ifdef KRB4
	165	if (options.kerberos_authentication == 1) {
	166	int ret = auth_krb4_password(pw, password);
	167	if (ret == 1 \|\| ret == 0)
	168	return ret;
5260325f	169	/* Fall back to ordinary passwd authentication. */
8efc0c15	170	}
57112b5a	171	#endif
5260325f	172
7f8f5e00	173	# ifdef HAVE_HPUX_TRUSTED_SYSTEM_PW
	174	prpw = getprpwnam(pw->pw_name);
	175	pw_password = prpw->ufld.fd_encrypt;
	176	#else
	177	pw_password = pw->pw_passwd;
	178	#endif
	179
5260325f	180	/* Check for users with no password. */
7f8f5e00	181	if (strcmp(password, "") == 0 && strcmp(pw_password, "") == 0)
5260325f	182	return 1;
8efc0c15	183
59dd7a31	184	#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
5260325f	185	spw = getspnam(pw->pw_name);
76b8607f	186	if (spw != NULL)
	187	{
	188	/* Check for users with no password. */
	189	if (strcmp(password, "") == 0 && strcmp(spw->sp_pwdp, "") == 0)
	190	return 1;
b2344d54	191
76b8607f	192	pw_password = spw->sp_pwdp;
76b8607f	193	}
f498ed15	194	#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
a423beaf	195	#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
	196	if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
	197	{
	198	/* Check for users with no password. */
	199	if (strcmp(password, "") == 0 && strcmp(spw->pwa_passwd, "") == 0)
	200	return 1;
	201
	202	pw_password = spw->pwa_passwd;
	203	}
	204	#endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
b2344d54	205
f498ed15	206	if (pw_password[0] != '\0')
f498ed15	207	salt = pw_password;
5260325f	208	else
f498ed15	209	salt = "xx";
59dd7a31	210
59dd7a31	211	#ifdef HAVE_MD5_PASSWORDS
f498ed15	212	if (is_md5_salt(salt))
f498ed15	213	encrypted_password = md5_crypt(password, salt);
59dd7a31	214	else
f498ed15	215	encrypted_password = crypt(password, salt);
59dd7a31	216	#else /* HAVE_MD5_PASSWORDS */
2b763e31	217	# ifdef HAVE_HPUX_TRUSTED_SYSTEM_PW
	218	encrypted_password = bigcrypt(password, salt);
	219	# else
f498ed15	220	encrypted_password = crypt(password, salt);
2b763e31	221	# endif /* HAVE_HPUX_TRUSTED_SYSTEM_PW */
59dd7a31	222	#endif /* HAVE_MD5_PASSWORDS */
b2344d54	223
5260325f	224	/* Authentication is accepted if the encrypted passwords are identical. */
f498ed15	225	return (strcmp(encrypted_password, pw_password) == 0);
8efc0c15	226	}
4d33e531	227	#endif /* !USE_PAM && !HAVE_OSF_SIA */