[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 1.24 2002/03/04 12:43:06 markus Exp $");

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

#include "packet.h"
#include "log.h"
#include "servconf.h"
#include "auth.h"

#ifdef HAVE_CRYPT_H
# include <crypt.h>
#endif
#ifdef WITH_AIXAUTHENTICATE
# include <login.h>
#endif
#ifdef __hpux
# include <hpsecurity.h>
# include <prot.h>
#endif
#ifdef HAVE_SCO_PROTECTED_PW
# include <sys/security.h>
# include <sys/audit.h>
# include <prot.h>
#endif /* HAVE_SCO_PROTECTED_PW */
#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
# include <shadow.h>
#endif
#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
# 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


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;
	char *encrypted_password;
	char *pw_password;
	char *salt;
#ifdef __hpux
	struct pr_passwd *spw;
#endif
#ifdef HAVE_SCO_PROTECTED_PW
	struct pr_passwd *spw;
#endif /* HAVE_SCO_PROTECTED_PW */
#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
	struct spwd *spw;
#endif
#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
	struct passwd_adjunct *spw;
#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 != PERMIT_YES)
		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 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
	return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
#endif
#ifdef KRB4
	if (options.kerberos_authentication == 1) {
		int ret = auth_krb4_password(authctxt, password);
		if (ret == 1 || ret == 0)
			return ret;
		/* Fall back to ordinary passwd authentication. */
	}
#endif
#ifdef BSD_AUTH
	if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
	    (char *)password) == 0)
		return 0;
	else
		return 1;
#endif
	pw_password = pw->pw_passwd;

	/*
	 * Various interfaces to shadow or protected password data
	 */
#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
	spw = getspnam(pw->pw_name);
	if (spw != NULL)
		pw_password = spw->sp_pwdp;
#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */

#ifdef HAVE_SCO_PROTECTED_PW
	spw = getprpwnam(pw->pw_name);
	if (spw != NULL)
		pw_password = spw->ufld.fd_encrypt;
#endif /* HAVE_SCO_PROTECTED_PW */

#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
	if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
		pw_password = spw->pwa_passwd;
#endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */

#if defined(__hpux)
	if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
		pw_password = spw->ufld.fd_encrypt;
#endif /* defined(__hpux) */

	/* Check for users with no password. */
	if ((password[0] == '\0') && (pw_password[0] == '\0'))
		return 1;

	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 __hpux
	if (iscomsec())
		encrypted_password = bigcrypt(password, salt);
	else
		encrypted_password = crypt(password, salt);
# else
#  ifdef HAVE_SCO_PROTECTED_PW
	encrypted_password = bigcrypt(password, salt);
#  else
	encrypted_password = crypt(password, salt);
#  endif /* HAVE_SCO_PROTECTED_PW */
# endif /* __hpux */
#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
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"
e9a17296	39	RCSID("$OpenBSD: auth-passwd.c,v 1.24 2002/03/04 12:43:06 markus Exp $");
3c0ef626	40
	41	#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
	42
	43	#include "packet.h"
3c0ef626	44	#include "log.h"
	45	#include "servconf.h"
	46	#include "auth.h"
	47
	48	#ifdef HAVE_CRYPT_H
	49	# include <crypt.h>
	50	#endif
	51	#ifdef WITH_AIXAUTHENTICATE
	52	# include <login.h>
	53	#endif
	54	#ifdef __hpux
	55	# include <hpsecurity.h>
	56	# include <prot.h>
	57	#endif
	58	#ifdef HAVE_SCO_PROTECTED_PW
	59	# include <sys/security.h>
	60	# include <sys/audit.h>
	61	# include <prot.h>
	62	#endif /* HAVE_SCO_PROTECTED_PW */
	63	#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
	64	# include <shadow.h>
	65	#endif
	66	#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
	67	# include <sys/label.h>
	68	# include <sys/audit.h>
	69	# include <pwdadj.h>
	70	#endif
	71	#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
	72	# include "md5crypt.h"
	73	#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
	74
	75	#ifdef HAVE_CYGWIN
	76	#undef ERROR
	77	#include <windows.h>
	78	#include <sys/cygwin.h>
	79	#define is_winnt (GetVersion() < 0x80000000)
	80	#endif
	81
	82
	83	extern ServerOptions options;
	84
	85	/*
	86	* Tries to authenticate the user using password. Returns true if
	87	* authentication succeeds.
	88	*/
	89	int
	90	auth_password(Authctxt authctxt, const char password)
	91	{
	92	struct passwd * pw = authctxt->pw;
	93	char *encrypted_password;
	94	char *pw_password;
	95	char *salt;
	96	#ifdef __hpux
	97	struct pr_passwd *spw;
	98	#endif
	99	#ifdef HAVE_SCO_PROTECTED_PW
	100	struct pr_passwd *spw;
	101	#endif /* HAVE_SCO_PROTECTED_PW */
	102	#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
	103	struct spwd *spw;
	104	#endif
	105	#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
	106	struct passwd_adjunct *spw;
	107	#endif
108	#ifdef WITH_AIXAUTHENTICATE
109	char *authmsg;
110	char *loginmsg;
111	int reenter = 1;
112	#endif
113
114	/* deny if no user. */
115	if (pw == NULL)
116	return 0;
117	#ifndef HAVE_CYGWIN
118	if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
119	return 0;
120	#endif
121	#ifdef HAVE_CYGWIN
122	/*
123	* Empty password is only possible on NT if the user has _really_
124	* an empty password and authentication is done, though.
125	*/
126	if (!is_winnt)
127	#endif
128	if (*password == '\0' && options.permit_empty_passwd == 0)
129	return 0;
130	#ifdef KRB5
131	if (options.kerberos_authentication == 1) {
132	int ret = auth_krb5_password(authctxt, password);
133	if (ret == 1 \|\| ret == 0)
134	return ret;
135	/* Fall back to ordinary passwd authentication. */
136	}
137	#endif
138	#ifdef HAVE_CYGWIN
139	if (is_winnt) {
140	HANDLE hToken = cygwin_logon_user(pw, password);
141
142	if (hToken == INVALID_HANDLE_VALUE)
143	return 0;
144	cygwin_set_impersonation_token(hToken);
145	return 1;
146	}
147	#endif
148	#ifdef WITH_AIXAUTHENTICATE
149	return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
150	#endif
151	#ifdef KRB4
152	if (options.kerberos_authentication == 1) {
153	int ret = auth_krb4_password(authctxt, password);
154	if (ret == 1 \|\| ret == 0)
155	return ret;
156	/* Fall back to ordinary passwd authentication. */
157	}
158	#endif
159	#ifdef BSD_AUTH
160	if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
161	(char *)password) == 0)
162	return 0;
163	else
164	return 1;
165	#endif
166	pw_password = pw->pw_passwd;
167
168	/*
169	* Various interfaces to shadow or protected password data
170	*/
171	#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
172	spw = getspnam(pw->pw_name);
173	if (spw != NULL)
174	pw_password = spw->sp_pwdp;
175	#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
176
177	#ifdef HAVE_SCO_PROTECTED_PW
178	spw = getprpwnam(pw->pw_name);
179	if (spw != NULL)
180	pw_password = spw->ufld.fd_encrypt;
181	#endif /* HAVE_SCO_PROTECTED_PW */
182
183	#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
184	if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
185	pw_password = spw->pwa_passwd;
186	#endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
187
188	#if defined(__hpux)
189	if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
190	pw_password = spw->ufld.fd_encrypt;
191	#endif /* defined(__hpux) */
192
193	/* Check for users with no password. */
194	if ((password[0] == '\0') && (pw_password[0] == '\0'))
195	return 1;
196
197	if (pw_password[0] != '\0')
198	salt = pw_password;
199	else
200	salt = "xx";
201
202	#ifdef HAVE_MD5_PASSWORDS
203	if (is_md5_salt(salt))
204	encrypted_password = md5_crypt(password, salt);
205	else
206	encrypted_password = crypt(password, salt);
207	#else /* HAVE_MD5_PASSWORDS */
208	# ifdef __hpux
209	if (iscomsec())
210	encrypted_password = bigcrypt(password, salt);
211	else
212	encrypted_password = crypt(password, salt);
213	# else
e9a17296	214	# ifdef HAVE_SCO_PROTECTED_PW
	215	encrypted_password = bigcrypt(password, salt);
	216	# else
3c0ef626	217	encrypted_password = crypt(password, salt);
e9a17296	218	# endif /* HAVE_SCO_PROTECTED_PW */
3c0ef626	219	# endif /* __hpux */
	220	#endif /* HAVE_MD5_PASSWORDS */
	221
	222	/* Authentication is accepted if the encrypted passwords are identical. */
	223	return (strcmp(encrypted_password, pw_password) == 0);
	224	}
	225	#endif /* !USE_PAM && !HAVE_OSF_SIA */