[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 1.27 2002/05/24 16:45:16 stevesk Exp $");

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

#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
/* Don't need any of these headers for the PAM or SIA cases */
# 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_SECUREWARE
#  include <sys/security.h>
#  include <sys/audit.h>
#  include <prot.h>
# endif /* HAVE_SECUREWARE */
# 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
#endif /* !USE_PAM && !HAVE_OSF_SIA */

extern ServerOptions options;
#ifdef WITH_AIXAUTHENTICATE
extern char *aixloginmsg;
#endif

/*
 * 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;
#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
	char *encrypted_password;
	char *pw_password;
	char *salt;
# if defined(__hpux) || defined(HAVE_SECUREWARE)
	struct pr_passwd *spw;
# endif /* __hpux || HAVE_SECUREWARE */
# 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;
	int authsuccess;
	int reenter = 1;
# endif
#endif /* !defined(USE_PAM) && !defined(HAVE_OSF_SIA) */

	/* 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 defined(USE_PAM)
	return auth_pam_password(authctxt, password) && ok;
#elif defined(HAVE_OSF_SIA)
	if (!ok)
		return 0;
	return auth_sia_password(authctxt, password);
#else
	if (!ok)
		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
	authsuccess = (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);

	if (authsuccess)
	        /* We don't have a pty yet, so just label the line as "ssh" */
	        if (loginsuccess(authctxt->user,
			get_canonical_hostname(options.verify_reverse_mapping),
			"ssh", &aixloginmsg) < 0)
				aixloginmsg = NULL;

	return(authsuccess);
# 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) */

# 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) */

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

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

	/* 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 */
#  if defined(__hpux) && !defined(HAVE_SECUREWARE)
	if (iscomsec())
		encrypted_password = bigcrypt(password, salt);
	else
		encrypted_password = crypt(password, salt);
#  else
#   ifdef HAVE_SECUREWARE
	encrypted_password = bigcrypt(password, salt);
#   else
	encrypted_password = crypt(password, salt);
#   endif /* HAVE_SECUREWARE */
#  endif /* __hpux && !defined(HAVE_SECUREWARE) */
# 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"
f5799ae1	39	RCSID("$OpenBSD: auth-passwd.c,v 1.27 2002/05/24 16:45:16 stevesk Exp $");
3c0ef626	40
3c0ef626	41	#include "packet.h"
3c0ef626	42	#include "log.h"
	43	#include "servconf.h"
	44	#include "auth.h"
	45
700318f3	46	#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
	47	/* Don't need any of these headers for the PAM or SIA cases */
	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_SECUREWARE
	59	# include <sys/security.h>
	60	# include <sys/audit.h>
	61	# include <prot.h>
	62	# endif /* HAVE_SECUREWARE */
	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	#endif /* !USE_PAM && !HAVE_OSF_SIA */
3c0ef626	82
3c0ef626	83	extern ServerOptions options;
41b2f314	84	#ifdef WITH_AIXAUTHENTICATE
	85	extern char *aixloginmsg;
	86	#endif
3c0ef626	87
	88	/*
	89	* Tries to authenticate the user using password. Returns true if
	90	* authentication succeeds.
	91	*/
	92	int
	93	auth_password(Authctxt authctxt, const char password)
	94	{
	95	struct passwd * pw = authctxt->pw;
7e772e1f	96	int ok = authctxt->valid;
6a9b3198	97	#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
3c0ef626	98	char *encrypted_password;
	99	char *pw_password;
	100	char *salt;
6a9b3198	101	# if defined(__hpux) \|\| defined(HAVE_SECUREWARE)
3c0ef626	102	struct pr_passwd *spw;
6a9b3198	103	# endif /* __hpux \|\| HAVE_SECUREWARE */
6a9b3198	104	# if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
3c0ef626	105	struct spwd *spw;
6a9b3198	106	# endif
6a9b3198	107	# if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
3c0ef626	108	struct passwd_adjunct *spw;
6a9b3198	109	# endif
6a9b3198	110	# ifdef WITH_AIXAUTHENTICATE
3c0ef626	111	char *authmsg;
41b2f314	112	int authsuccess;
3c0ef626	113	int reenter = 1;
6a9b3198	114	# endif
6a9b3198	115	#endif /* !defined(USE_PAM) && !defined(HAVE_OSF_SIA) */
3c0ef626	116
	117	/* deny if no user. */
	118	if (pw == NULL)
7e772e1f	119	ok = 0;
3c0ef626	120	#ifndef HAVE_CYGWIN
7e772e1f	121	if (pw && pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
7e772e1f	122	ok = 0;
3c0ef626	123	#endif
3c0ef626	124	if (*password == '\0' && options.permit_empty_passwd == 0)
7e772e1f	125	ok = 0;
6a9b3198	126
6a9b3198	127	#if defined(USE_PAM)
7e772e1f	128	return auth_pam_password(authctxt, password) && ok;
6a9b3198	129	#elif defined(HAVE_OSF_SIA)
7e772e1f	130	if (!ok)
7e772e1f	131	return 0;
6a9b3198	132	return auth_sia_password(authctxt, password);
6a9b3198	133	#else
7e772e1f	134	if (!ok)
7e772e1f	135	return 0;
6a9b3198	136	# ifdef KRB5
3c0ef626	137	if (options.kerberos_authentication == 1) {
	138	int ret = auth_krb5_password(authctxt, password);
	139	if (ret == 1 \|\| ret == 0)
	140	return ret;
	141	/* Fall back to ordinary passwd authentication. */
	142	}
6a9b3198	143	# endif
6a9b3198	144	# ifdef HAVE_CYGWIN
3c0ef626	145	if (is_winnt) {
	146	HANDLE hToken = cygwin_logon_user(pw, password);
	147
	148	if (hToken == INVALID_HANDLE_VALUE)
	149	return 0;
	150	cygwin_set_impersonation_token(hToken);
	151	return 1;
	152	}
6a9b3198	153	# endif
6a9b3198	154	# ifdef WITH_AIXAUTHENTICATE
41b2f314	155	authsuccess = (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
	156
	157	if (authsuccess)
	158	/* We don't have a pty yet, so just label the line as "ssh" */
	159	if (loginsuccess(authctxt->user,
	160	get_canonical_hostname(options.verify_reverse_mapping),
	161	"ssh", &aixloginmsg) < 0)
	162	aixloginmsg = NULL;
	163
	164	return(authsuccess);
6a9b3198	165	# endif
6a9b3198	166	# ifdef KRB4
3c0ef626	167	if (options.kerberos_authentication == 1) {
	168	int ret = auth_krb4_password(authctxt, password);
	169	if (ret == 1 \|\| ret == 0)
	170	return ret;
	171	/* Fall back to ordinary passwd authentication. */
	172	}
6a9b3198	173	# endif
6a9b3198	174	# ifdef BSD_AUTH
3c0ef626	175	if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
	176	(char *)password) == 0)
	177	return 0;
	178	else
	179	return 1;
6a9b3198	180	# endif
3c0ef626	181	pw_password = pw->pw_passwd;
	182
	183	/*
	184	* Various interfaces to shadow or protected password data
	185	*/
6a9b3198	186	# if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
3c0ef626	187	spw = getspnam(pw->pw_name);
	188	if (spw != NULL)
	189	pw_password = spw->sp_pwdp;
6a9b3198	190	# endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
3c0ef626	191
6a9b3198	192	# if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
3c0ef626	193	if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
3c0ef626	194	pw_password = spw->pwa_passwd;
6a9b3198	195	# endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
3c0ef626	196
6a9b3198	197	# ifdef HAVE_SECUREWARE
700318f3	198	if ((spw = getprpwnam(pw->pw_name)) != NULL)
700318f3	199	pw_password = spw->ufld.fd_encrypt;
6a9b3198	200	# endif /* HAVE_SECUREWARE */
700318f3	201
6a9b3198	202	# if defined(__hpux) && !defined(HAVE_SECUREWARE)
3c0ef626	203	if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
3c0ef626	204	pw_password = spw->ufld.fd_encrypt;
6a9b3198	205	# endif /* defined(__hpux) && !defined(HAVE_SECUREWARE) */
3c0ef626	206
	207	/* Check for users with no password. */
	208	if ((password[0] == '\0') && (pw_password[0] == '\0'))
	209	return 1;
	210
	211	if (pw_password[0] != '\0')
	212	salt = pw_password;
	213	else
	214	salt = "xx";
	215
6a9b3198	216	# ifdef HAVE_MD5_PASSWORDS
3c0ef626	217	if (is_md5_salt(salt))
	218	encrypted_password = md5_crypt(password, salt);
	219	else
	220	encrypted_password = crypt(password, salt);
6a9b3198	221	# else /* HAVE_MD5_PASSWORDS */
6a9b3198	222	# if defined(__hpux) && !defined(HAVE_SECUREWARE)
3c0ef626	223	if (iscomsec())
	224	encrypted_password = bigcrypt(password, salt);
	225	else
	226	encrypted_password = crypt(password, salt);
e9a17296	227	# else
6a9b3198	228	# ifdef HAVE_SECUREWARE
	229	encrypted_password = bigcrypt(password, salt);
	230	# else
3c0ef626	231	encrypted_password = crypt(password, salt);
6a9b3198	232	# endif /* HAVE_SECUREWARE */
	233	# endif /* __hpux && !defined(HAVE_SECUREWARE) */
	234	# endif /* HAVE_MD5_PASSWORDS */
3c0ef626	235
	236	/* Authentication is accepted if the encrypted passwords are identical. */
	237	return (strcmp(encrypted_password, pw_password) == 0);
3c0ef626	238	#endif /* !USE_PAM && !HAVE_OSF_SIA */
700318f3	239	}