smbencrypt.c

来自「samba最新软件」· C语言 代码 · 共 541 行 · 第 1/2 页

/* 
   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "system/time.h"
#include "auth/ntlmssp/ntlmssp.h"
#include "auth/ntlmssp/msrpc_parse.h"
#include "lib/crypto/crypto.h"
#include "libcli/auth/libcli_auth.h"
#include "pstring.h"
#include "param/param.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 uint8_t *c8, uint8_t p24[24])
{
	bool ret;
	uint8_t 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, p21, 16);
	dump_data(100, c8, 8);
	dump_data(100, 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
 */
 
bool E_md4hash(const char *passwd, uint8_t p16[16])
{
	int len;
	void *wpwd;

	len = push_ucs2_talloc(NULL, lp_iconv_convenience(global_loadparm), &wpwd, passwd);
	if (len < 2) {
		/* We don't want to return fixed data, as most callers
		 * don't check */
		mdfour(p16, (const uint8_t *)passwd, strlen(passwd));
		return false;
	}
	
	len -= 2;
	mdfour(p16, wpwd, len);

	talloc_free(wpwd);
	return true;
}

/**
 * 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, uint8_t p16[16])
{
	bool ret = true;
	fstring dospwd; 
	ZERO_STRUCT(dospwd);

	/* Password must be converted to DOS charset - null terminated, uppercase. */
	push_string(lp_iconv_convenience(global_loadparm), dospwd, passwd, sizeof(dospwd), STR_ASCII|STR_UPPER|STR_TERMINATE);

	/* Only the first 14 chars are considered, password need not be null terminated. */
	E_P16((const uint8_t *)dospwd, p16);

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

	ZERO_STRUCT(dospwd);	

	return ret;
}

/* Does both the NTLMv2 owfs of a user's password */
bool ntv2_owf_gen(const uint8_t owf[16],
		  const char *user_in, const char *domain_in,
		  bool upper_case_domain, /* Transform the domain into UPPER case */
		  uint8_t kr_buf[16])
{
	void *user;
	void *domain;	
	size_t user_byte_len;
	size_t domain_byte_len;

	HMACMD5Context ctx;
	TALLOC_CTX *mem_ctx = talloc_init("ntv2_owf_gen for %s\\%s", domain_in, user_in); 
	struct smb_iconv_convenience *iconv_convenience = lp_iconv_convenience(global_loadparm);

	if (!mem_ctx) {
		return false;
	}

	if (!user_in) {
		user_in = "";
	}

	if (!domain_in) {
		domain_in = "";
	}

	user_in = strupper_talloc(mem_ctx, user_in);
	if (user_in == NULL) {
		talloc_free(mem_ctx);
		return false;
	}

	if (upper_case_domain) {
		domain_in = strupper_talloc(mem_ctx, domain_in);
		if (domain_in == NULL) {
			talloc_free(mem_ctx);
			return false;
		}
	}

	user_byte_len = push_ucs2_talloc(mem_ctx, iconv_convenience, &user, user_in);
	if (user_byte_len == (ssize_t)-1) {
		DEBUG(0, ("push_uss2_talloc() for user returned -1 (probably talloc() failure)\n"));
		talloc_free(mem_ctx);
		return false;
	}

	domain_byte_len = push_ucs2_talloc(mem_ctx, iconv_convenience, &domain, domain_in);
	if (domain_byte_len == (ssize_t)-1) {
		DEBUG(0, ("push_ucs2_talloc() for domain returned -1 (probably talloc() failure)\n"));
		talloc_free(mem_ctx);
		return false;
	}

	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(user, user_byte_len, &ctx);
	hmac_md5_update(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, user, user_byte_len);
	dump_data(100, domain, domain_byte_len);
	dump_data(100, owf, 16);
	dump_data(100, kr_buf, 16);
#endif

	talloc_free(mem_ctx);
	return true;
}

/* Does the des encryption from the NT or LM MD4 hash. */
void SMBOWFencrypt(const uint8_t passwd[16], const uint8_t *c8, uint8_t p24[24])
{
	uint8_t p21[21];

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

/* Does the NT MD4 hash then des encryption. */
 
void SMBNTencrypt(const char *passwd, uint8_t *c8, uint8_t *p24)
{
	uint8_t 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, p21, 16);
	dump_data(100, c8, 8);
	dump_data(100, p24, 24);
#endif
}

/* Does the md5 encryption from the Key Response for NTLMv2. */
void SMBOWFencrypt_ntv2(const uint8_t kr[16],
			const DATA_BLOB *srv_chal,
			const DATA_BLOB *smbcli_chal,
			uint8_t 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(smbcli_chal->data, smbcli_chal->length, &ctx);
	hmac_md5_final(resp_buf, &ctx);

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

void SMBsesskeygen_ntv2(const uint8_t kr[16],
			const uint8_t * nt_resp, uint8_t 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((uint8_t *)sess_key, &ctx);

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

void SMBsesskeygen_ntv1(const uint8_t kr[16], uint8_t sess_key[16])
{
	/* yes, this session key does not change - yes, this 
	   is a problem - but it is 128 bits */
	
	mdfour((uint8_t *)sess_key, kr, 16);

#ifdef DEBUG_PASSWORD
	DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
	dump_data(100, sess_key, 16);