ntlm_check.c

samba-3.0.22.tar.gz 编译smb服务器的源码

/* 
   Unix SMB/CIFS implementation.
   Password and authentication handling
   Copyright (C) Andrew Tridgell              1992-2000
   Copyright (C) Luke Kenneth Casson Leighton 1996-2000
   Copyright (C) Andrew Bartlett              2001-2003
   Copyright (C) Gerald Carter                2003
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH

/****************************************************************************
 Core of smb password checking routine.
****************************************************************************/

static BOOL smb_pwd_check_ntlmv1(const DATA_BLOB *nt_response,
				 const uchar *part_passwd,
				 const DATA_BLOB *sec_blob,
				 DATA_BLOB *user_sess_key)
{
	/* Finish the encryption of part_passwd. */
	uchar p24[24];
	
	if (part_passwd == NULL) {
		DEBUG(10,("No password set - DISALLOWING access\n"));
		/* No password set - always false ! */
		return False;
	}
	
	if (sec_blob->length != 8) {
		DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect challenge size (%lu)\n", 
			  (unsigned long)sec_blob->length));
		return False;
	}
	
	if (nt_response->length != 24) {
		DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect password length (%lu)\n", 
			  (unsigned long)nt_response->length));
		return False;
	}

	SMBOWFencrypt(part_passwd, sec_blob->data, p24);
	if (user_sess_key != NULL) {
		*user_sess_key = data_blob(NULL, 16);
		SMBsesskeygen_ntv1(part_passwd, NULL, user_sess_key->data);
	}
	
	
#ifdef DEBUG_PASSWORD
	DEBUG(100,("Part password (P16) was |\n"));
	dump_data(100, (const char *)part_passwd, 16);
	DEBUGADD(100,("Password from client was |\n"));
	dump_data(100, (const char *)nt_response->data, nt_response->length);
	DEBUGADD(100,("Given challenge was |\n"));
	dump_data(100, (const char *)sec_blob->data, sec_blob->length);
	DEBUGADD(100,("Value from encryption was |\n"));
	dump_data(100, (const char *)p24, 24);
#endif
	return (memcmp(p24, nt_response->data, 24) == 0);
}

/****************************************************************************
 Core of smb password checking routine. (NTLMv2, LMv2)
 Note:  The same code works with both NTLMv2 and LMv2.
****************************************************************************/

static BOOL smb_pwd_check_ntlmv2(const DATA_BLOB *ntv2_response,
				 const uchar *part_passwd,
				 const DATA_BLOB *sec_blob,
				 const char *user, const char *domain,
				 BOOL upper_case_domain, /* should the domain be transformed into upper case? */
				 DATA_BLOB *user_sess_key)
{
	/* Finish the encryption of part_passwd. */
	uchar kr[16];
	uchar value_from_encryption[16];
	uchar client_response[16];
	DATA_BLOB client_key_data;
	BOOL res;

	if (part_passwd == NULL) {
		DEBUG(10,("No password set - DISALLOWING access\n"));
		/* No password set - always False */
		return False;
	}

	if (sec_blob->length != 8) {
		DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect challenge size (%lu)\n", 
			  (unsigned long)sec_blob->length));
		return False;
	}
	
	if (ntv2_response->length < 24) {
		/* We MUST have more than 16 bytes, or the stuff below will go
		   crazy.  No known implementation sends less than the 24 bytes
		   for LMv2, let alone NTLMv2. */
		DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%lu)\n", 
			  (unsigned long)ntv2_response->length));
		return False;
	}

	client_key_data = data_blob(ntv2_response->data+16, ntv2_response->length-16);
	/* 
	   todo:  should we be checking this for anything?  We can't for LMv2, 
	   but for NTLMv2 it is meant to contain the current time etc.
	*/

	memcpy(client_response, ntv2_response->data, sizeof(client_response));

	if (!ntv2_owf_gen(part_passwd, user, domain, upper_case_domain, kr)) {
		return False;
	}

	SMBOWFencrypt_ntv2(kr, sec_blob, &client_key_data, value_from_encryption);
	if (user_sess_key != NULL) {
		*user_sess_key = data_blob(NULL, 16);
		SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key->data);
	}

#if DEBUG_PASSWORD
	DEBUG(100,("Part password (P16) was |\n"));
	dump_data(100, (const char *)part_passwd, 16);
	DEBUGADD(100,("Password from client was |\n"));
	dump_data(100, (const char *)ntv2_response->data, ntv2_response->length);
	DEBUGADD(100,("Variable data from client was |\n"));
	dump_data(100, (const char *)client_key_data.data, client_key_data.length);
	DEBUGADD(100,("Given challenge was |\n"));
	dump_data(100, (const char *)sec_blob->data, sec_blob->length);
	DEBUGADD(100,("Value from encryption was |\n"));
	dump_data(100, (const char *)value_from_encryption, 16);
#endif
	data_blob_clear_free(&client_key_data);
	res = (memcmp(value_from_encryption, client_response, 16) == 0);
	if ((!res) && (user_sess_key != NULL))
		data_blob_clear_free(user_sess_key);
	return res;
}

/**
 * Check a challenge-response password against the value of the NT or
 * LM password hash.
 *
 * @param mem_ctx talloc context
 * @param challenge 8-byte challenge.  If all zero, forces plaintext comparison
 * @param nt_response 'unicode' NT response to the challenge, or unicode password
 * @param lm_response ASCII or LANMAN response to the challenge, or password in DOS code page
 * @param username internal Samba username, for log messages
 * @param client_username username the client used
 * @param client_domain domain name the client used (may be mapped)
 * @param nt_pw MD4 unicode password from our passdb or similar
 * @param lm_pw LANMAN ASCII password from our passdb or similar
 * @param user_sess_key User session key
 * @param lm_sess_key LM session key (first 8 bytes of the LM hash)
 */

NTSTATUS ntlm_password_check(TALLOC_CTX *mem_ctx,
			     const DATA_BLOB *challenge,
			     const DATA_BLOB *lm_response,
			     const DATA_BLOB *nt_response,
			     const DATA_BLOB *lm_interactive_pwd,
			     const DATA_BLOB *nt_interactive_pwd,
			     const char *username, 
			     const char *client_username, 
			     const char *client_domain,
			     const uint8 *lm_pw, const uint8 *nt_pw, 
			     DATA_BLOB *user_sess_key, 
			     DATA_BLOB *lm_sess_key)
{
	static const unsigned char zeros[8];
	if (nt_pw == NULL) {
		DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n", 
			 username));
	}

	if (nt_interactive_pwd && nt_interactive_pwd->length && nt_pw) { 
		if (nt_interactive_pwd->length != 16) {
			DEBUG(3,("ntlm_password_check: Interactive logon: Invalid NT password length (%d) supplied for user %s\n", (int)nt_interactive_pwd->length,
				 username));
			return NT_STATUS_WRONG_PASSWORD;
		}

		if (memcmp(nt_interactive_pwd->data, nt_pw, 16) == 0) {
			if (user_sess_key) {
				*user_sess_key = data_blob(NULL, 16);
				SMBsesskeygen_ntv1(nt_pw, NULL, user_sess_key->data);
			}
			return NT_STATUS_OK;
		} else {
			DEBUG(3,("ntlm_password_check: Interactive logon: NT password check failed for user %s\n",
				 username));
			return NT_STATUS_WRONG_PASSWORD;
		}

	} else if (lm_interactive_pwd && lm_interactive_pwd->length && lm_pw) { 
		if (lm_interactive_pwd->length != 16) {
			DEBUG(3,("ntlm_password_check: Interactive logon: Invalid LANMAN password length (%d) supplied for user %s\n", (int)lm_interactive_pwd->length,
				 username));
			return NT_STATUS_WRONG_PASSWORD;
		}

		if (!lp_lanman_auth()) {
			DEBUG(3,("ntlm_password_check: Interactive logon: only LANMAN password supplied for user %s, and LM passwords are disabled!\n",
				 username));
			return NT_STATUS_WRONG_PASSWORD;
		}

		if (memcmp(lm_interactive_pwd->data, lm_pw, 16) == 0) {
			return NT_STATUS_OK;
		} else {
			DEBUG(3,("ntlm_password_check: Interactive logon: LANMAN password check failed for user %s\n",
				 username));
			return NT_STATUS_WRONG_PASSWORD;
		}
	}