smbencrypt.c

samba-3.0.22.tar.gz 编译smb服务器的源码

/* 
   Unix SMB/CIFS implementation.
   SMB parameters and setup
   Copyright (C) Andrew Tridgell 1992-1998
   Modified by Jeremy Allison 1995.
   Copyright (C) Jeremy Allison 1995-2000.
   Copyright (C) Luke Kennethc Casson Leighton 1996-2000.
   Copyright (C) Andrew Bartlett <[e-mail]> 2002-2003
   
   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"
#include "byteorder.h"

/*
   This implements the X/Open SMB password encryption
   It takes a password ('unix' string), a 8 byte "crypt key" 
   and puts 24 bytes of encrypted password into p24 

   Returns False if password must have been truncated to create LM hash
*/
BOOL SMBencrypt(const char *passwd, const uchar *c8, uchar p24[24])
{
	BOOL ret;
	uchar p21[21];

	memset(p21,'\0',21);
	ret = E_deshash(passwd, p21); 

	SMBOWFencrypt(p21, c8, p24);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("SMBencrypt: lm#, challenge, response\n"));
	dump_data(100, (const char *)p21, 16);
	dump_data(100, (const char *)c8, 8);
	dump_data(100, (const char *)p24, 24);
#endif

	return ret;
}

/**
 * Creates the MD4 Hash of the users password in NT UNICODE.
 * @param passwd password in 'unix' charset.
 * @param p16 return password hashed with md4, caller allocated 16 byte buffer
 */
 
void E_md4hash(const char *passwd, uchar p16[16])
{
	int len;
	smb_ucs2_t wpwd[129];
	
	/* Password must be converted to NT unicode - null terminated. */
	push_ucs2(NULL, wpwd, (const char *)passwd, 256, STR_UNICODE|STR_NOALIGN|STR_TERMINATE);
	/* Calculate length in bytes */
	len = strlen_w(wpwd) * sizeof(int16);

	mdfour(p16, (unsigned char *)wpwd, len);
	ZERO_STRUCT(wpwd);	
}

/**
 * Creates the MD5 Hash of a combination of 16 byte salt and 16 byte NT hash.
 * @param 16 byte salt.
 * @param 16 byte NT hash.
 * @param 16 byte return hashed with md5, caller allocated 16 byte buffer
 */

void E_md5hash(const uchar salt[16], const uchar nthash[16], uchar hash_out[16])
{
	struct MD5Context tctx;
	uchar array[32];
	
	memset(hash_out, '\0', 16);
	memcpy(array, salt, 16);
	memcpy(&array[16], nthash, 16);
	MD5Init(&tctx);
	MD5Update(&tctx, array, 32);
	MD5Final(hash_out, &tctx);
}

/**
 * Creates the DES forward-only Hash of the users password in DOS ASCII charset
 * @param passwd password in 'unix' charset.
 * @param p16 return password hashed with DES, caller allocated 16 byte buffer
 * @return False if password was > 14 characters, and therefore may be incorrect, otherwise True
 * @note p16 is filled in regardless
 */
 
BOOL E_deshash(const char *passwd, uchar p16[16])
{
	BOOL ret = True;
	fstring dospwd; 
	ZERO_STRUCT(dospwd);
	
	/* Password must be converted to DOS charset - null terminated, uppercase. */
	push_ascii(dospwd, passwd, sizeof(dospwd), STR_UPPER|STR_TERMINATE);
       
	/* Only the fisrt 14 chars are considered, password need not be null terminated. */
	E_P16((const unsigned char *)dospwd, p16);

	if (strlen(dospwd) > 14) {
		ret = False;
	}

	ZERO_STRUCT(dospwd);	

	return ret;
}

/**
 * Creates the MD4 and DES (LM) Hash of the users password.  
 * MD4 is of the NT Unicode, DES is of the DOS UPPERCASE password.
 * @param passwd password in 'unix' charset.
 * @param nt_p16 return password hashed with md4, caller allocated 16 byte buffer
 * @param p16 return password hashed with des, caller allocated 16 byte buffer
 */
 
/* Does both the NT and LM owfs of a user's password */
void nt_lm_owf_gen(const char *pwd, uchar nt_p16[16], uchar p16[16])
{
	/* Calculate the MD4 hash (NT compatible) of the password */
	memset(nt_p16, '\0', 16);
	E_md4hash(pwd, nt_p16);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n"));
	dump_data(120, pwd, strlen(pwd));
	dump_data(100, (char *)nt_p16, 16);
#endif

	E_deshash(pwd, (uchar *)p16);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
	dump_data(120, pwd, strlen(pwd));
	dump_data(100, (char *)p16, 16);
#endif
}

/* Does both the NTLMv2 owfs of a user's password */
BOOL ntv2_owf_gen(const uchar owf[16],
		  const char *user_in, const char *domain_in,
		  BOOL upper_case_domain, /* Transform the domain into UPPER case */
		  uchar kr_buf[16])
{
	smb_ucs2_t *user;
	smb_ucs2_t *domain;
	
	size_t user_byte_len;
	size_t domain_byte_len;

	HMACMD5Context ctx;

	user_byte_len = push_ucs2_allocate(&user, user_in);
	if (user_byte_len == (size_t)-1) {
		DEBUG(0, ("push_uss2_allocate() for user returned -1 (probably malloc() failure)\n"));
		return False;
	}

	domain_byte_len = push_ucs2_allocate(&domain, domain_in);
	if (domain_byte_len == (size_t)-1) {
		DEBUG(0, ("push_uss2_allocate() for domain returned -1 (probably malloc() failure)\n"));
		return False;
	}

	strupper_w(user);

	if (upper_case_domain)
		strupper_w(domain);

	SMB_ASSERT(user_byte_len >= 2);
	SMB_ASSERT(domain_byte_len >= 2);

	/* We don't want null termination */
	user_byte_len = user_byte_len - 2;
	domain_byte_len = domain_byte_len - 2;
	
	hmac_md5_init_limK_to_64(owf, 16, &ctx);
	hmac_md5_update((const unsigned char *)user, user_byte_len, &ctx);
	hmac_md5_update((const unsigned char *)domain, domain_byte_len, &ctx);
	hmac_md5_final(kr_buf, &ctx);

#ifdef DEBUG_PASSWORD
	DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
	dump_data(100, (const char *)user, user_byte_len);
	dump_data(100, (const char *)domain, domain_byte_len);
	dump_data(100, (const char *)owf, 16);
	dump_data(100, (const char *)kr_buf, 16);
#endif

	SAFE_FREE(user);
	SAFE_FREE(domain);
	return True;
}

/* Does the des encryption from the NT or LM MD4 hash. */
void SMBOWFencrypt(const uchar passwd[16], const uchar *c8, uchar p24[24])
{
	uchar p21[21];

	ZERO_STRUCT(p21);
 
	memcpy(p21, passwd, 16);    
	E_P24(p21, c8, p24);
}

/* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
void NTLMSSPOWFencrypt(const uchar passwd[8], const uchar *ntlmchalresp, uchar p24[24])
{
	uchar p21[21];
 
	memset(p21,'\0',21);
	memcpy(p21, passwd, 8);    
	memset(p21 + 8, 0xbd, 8);    

	E_P24(p21, ntlmchalresp, p24);
#ifdef DEBUG_PASSWORD
	DEBUG(100,("NTLMSSPOWFencrypt: p21, c8, p24\n"));
	dump_data(100, (char *)p21, 21);
	dump_data(100, (const char *)ntlmchalresp, 8);
	dump_data(100, (char *)p24, 24);
#endif
}


/* Does the NT MD4 hash then des encryption. */
 
void SMBNTencrypt(const char *passwd, uchar *c8, uchar *p24)
{
	uchar p21[21];
 
	memset(p21,'\0',21);
 
	E_md4hash(passwd, p21);    
	SMBOWFencrypt(p21, c8, p24);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
	dump_data(100, (char *)p21, 16);
	dump_data(100, (char *)c8, 8);
	dump_data(100, (char *)p24, 24);
#endif
}

/* Does the md5 encryption from the Key Response for NTLMv2. */
void SMBOWFencrypt_ntv2(const uchar kr[16],
			const DATA_BLOB *srv_chal,
			const DATA_BLOB *cli_chal,
			uchar resp_buf[16])
{
	HMACMD5Context ctx;

	hmac_md5_init_limK_to_64(kr, 16, &ctx);
	hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
	hmac_md5_update(cli_chal->data, cli_chal->length, &ctx);
	hmac_md5_final(resp_buf, &ctx);

#ifdef DEBUG_PASSWORD
	DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, cli_chal, resp_buf\n"));
	dump_data(100, (const char *)srv_chal->data, srv_chal->length);
	dump_data(100, (const char *)cli_chal->data, cli_chal->length);
	dump_data(100, (const char *)resp_buf, 16);
#endif
}

void SMBsesskeygen_ntv2(const uchar kr[16],
			const uchar * nt_resp, uint8 sess_key[16])
{
	/* a very nice, 128 bit, variable session key */
	
	HMACMD5Context ctx;

	hmac_md5_init_limK_to_64(kr, 16, &ctx);
	hmac_md5_update(nt_resp, 16, &ctx);
	hmac_md5_final((unsigned char *)sess_key, &ctx);

#ifdef DEBUG_PASSWORD
	DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
	dump_data(100, (const char *)sess_key, 16);
#endif
}

void SMBsesskeygen_ntv1(const uchar kr[16],
			const uchar * nt_resp, uint8 sess_key[16])
{
	/* yes, this session key does not change - yes, this 
	   is a problem - but it is 128 bits */
	
	mdfour((unsigned char *)sess_key, kr, 16);

#ifdef DEBUG_PASSWORD
	DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
	dump_data(100, (const char *)sess_key, 16);
#endif
}

void SMBsesskeygen_lm_sess_key(const uchar lm_hash[16],
			const uchar lm_resp[24], /* only uses 8 */ 
			uint8 sess_key[16])