2 Unix SMB/CIFS implementation.
3 SMB parameters and setup
4 Copyright (C) Andrew Tridgell 1992-1998
5 Modified by Jeremy Allison 1995.
6 Copyright (C) Jeremy Allison 1995-2000.
7 Copyright (C) Luke Kennethc Casson Leighton 1996-2000.
8 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include "system/time.h"
27 #include "auth/ntlmssp/ntlmssp.h"
28 #include "auth/ntlmssp/msrpc_parse.h"
29 #include "lib/crypto/crypto.h"
30 #include "libcli/auth/libcli_auth.h"
34 This implements the X/Open SMB password encryption
35 It takes a password ('unix' string), a 8 byte "crypt key"
36 and puts 24 bytes of encrypted password into p24
38 Returns False if password must have been truncated to create LM hash
40 BOOL SMBencrypt(const char *passwd, const uint8_t *c8, uint8_t p24[24])
46 ret = E_deshash(passwd, p21);
48 SMBOWFencrypt(p21, c8, p24);
51 DEBUG(100,("SMBencrypt: lm#, challenge, response\n"));
52 dump_data(100, p21, 16);
53 dump_data(100, c8, 8);
54 dump_data(100, p24, 24);
61 * Creates the MD4 Hash of the users password in NT UNICODE.
62 * @param passwd password in 'unix' charset.
63 * @param p16 return password hashed with md4, caller allocated 16 byte buffer
66 void E_md4hash(const char *passwd, uint8_t p16[16])
71 len = push_ucs2_talloc(NULL, &wpwd, passwd);
75 mdfour(p16, wpwd, len);
81 * Creates the DES forward-only Hash of the users password in DOS ASCII charset
82 * @param passwd password in 'unix' charset.
83 * @param p16 return password hashed with DES, caller allocated 16 byte buffer
84 * @return False if password was > 14 characters, and therefore may be incorrect, otherwise True
85 * @note p16 is filled in regardless
88 BOOL E_deshash(const char *passwd, uint8_t p16[16])
94 /* Password must be converted to DOS charset - null terminated, uppercase. */
95 push_string(dospwd, passwd, sizeof(dospwd), STR_ASCII|STR_UPPER|STR_TERMINATE);
97 /* Only the fisrt 14 chars are considered, password need not be null terminated. */
98 E_P16((const uint8_t *)dospwd, p16);
100 if (strlen(dospwd) > 14) {
109 /* Does both the NTLMv2 owfs of a user's password */
110 BOOL ntv2_owf_gen(const uint8_t owf[16],
111 const char *user_in, const char *domain_in,
112 BOOL upper_case_domain, /* Transform the domain into UPPER case */
117 size_t user_byte_len;
118 size_t domain_byte_len;
121 TALLOC_CTX *mem_ctx = talloc_init("ntv2_owf_gen for %s\\%s", domain_in, user_in);
134 user_in = strupper_talloc(mem_ctx, user_in);
135 if (user_in == NULL) {
136 talloc_free(mem_ctx);
140 if (upper_case_domain) {
141 domain_in = strupper_talloc(mem_ctx, domain_in);
142 if (domain_in == NULL) {
143 talloc_free(mem_ctx);
148 user_byte_len = push_ucs2_talloc(mem_ctx, &user, user_in);
149 if (user_byte_len == (ssize_t)-1) {
150 DEBUG(0, ("push_uss2_talloc() for user returned -1 (probably talloc() failure)\n"));
151 talloc_free(mem_ctx);
155 domain_byte_len = push_ucs2_talloc(mem_ctx, &domain, domain_in);
156 if (domain_byte_len == (ssize_t)-1) {
157 DEBUG(0, ("push_ucs2_talloc() for domain returned -1 (probably talloc() failure)\n"));
158 talloc_free(mem_ctx);
162 SMB_ASSERT(user_byte_len >= 2);
163 SMB_ASSERT(domain_byte_len >= 2);
165 /* We don't want null termination */
166 user_byte_len = user_byte_len - 2;
167 domain_byte_len = domain_byte_len - 2;
169 hmac_md5_init_limK_to_64(owf, 16, &ctx);
170 hmac_md5_update(user, user_byte_len, &ctx);
171 hmac_md5_update(domain, domain_byte_len, &ctx);
172 hmac_md5_final(kr_buf, &ctx);
174 #ifdef DEBUG_PASSWORD
175 DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
176 dump_data(100, user, user_byte_len);
177 dump_data(100, domain, domain_byte_len);
178 dump_data(100, owf, 16);
179 dump_data(100, kr_buf, 16);
182 talloc_free(mem_ctx);
186 /* Does the des encryption from the NT or LM MD4 hash. */
187 void SMBOWFencrypt(const uint8_t passwd[16], const uint8_t *c8, uint8_t p24[24])
193 memcpy(p21, passwd, 16);
197 /* Does the NT MD4 hash then des encryption. */
199 void SMBNTencrypt(const char *passwd, uint8_t *c8, uint8_t *p24)
205 E_md4hash(passwd, p21);
206 SMBOWFencrypt(p21, c8, p24);
208 #ifdef DEBUG_PASSWORD
209 DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
210 dump_data(100, p21, 16);
211 dump_data(100, c8, 8);
212 dump_data(100, p24, 24);
216 /* Does the md5 encryption from the Key Response for NTLMv2. */
217 void SMBOWFencrypt_ntv2(const uint8_t kr[16],
218 const DATA_BLOB *srv_chal,
219 const DATA_BLOB *smbcli_chal,
220 uint8_t resp_buf[16])
224 hmac_md5_init_limK_to_64(kr, 16, &ctx);
225 hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
226 hmac_md5_update(smbcli_chal->data, smbcli_chal->length, &ctx);
227 hmac_md5_final(resp_buf, &ctx);
229 #ifdef DEBUG_PASSWORD
230 DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, smbcli_chal, resp_buf\n"));
231 dump_data(100, srv_chal->data, srv_chal->length);
232 dump_data(100, smbcli_chal->data, smbcli_chal->length);
233 dump_data(100, resp_buf, 16);
237 void SMBsesskeygen_ntv2(const uint8_t kr[16],
238 const uint8_t * nt_resp, uint8_t sess_key[16])
240 /* a very nice, 128 bit, variable session key */
244 hmac_md5_init_limK_to_64(kr, 16, &ctx);
245 hmac_md5_update(nt_resp, 16, &ctx);
246 hmac_md5_final((uint8_t *)sess_key, &ctx);
248 #ifdef DEBUG_PASSWORD
249 DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
250 dump_data(100, sess_key, 16);
254 void SMBsesskeygen_ntv1(const uint8_t kr[16], uint8_t sess_key[16])
256 /* yes, this session key does not change - yes, this
257 is a problem - but it is 128 bits */
259 mdfour((uint8_t *)sess_key, kr, 16);
261 #ifdef DEBUG_PASSWORD
262 DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
263 dump_data(100, sess_key, 16);
267 void SMBsesskeygen_lm_sess_key(const uint8_t lm_hash[16],
268 const uint8_t lm_resp[24], /* only uses 8 */
269 uint8_t sess_key[16])
271 /* Calculate the LM session key (effective length 40 bits,
272 but changes with each session) */
274 uint8_t partial_lm_hash[14];
276 memcpy(partial_lm_hash, lm_hash, 8);
277 memset(partial_lm_hash + 8, 0xbd, 6);
279 des_crypt56(p24, lm_resp, partial_lm_hash, 1);
280 des_crypt56(p24+8, lm_resp, partial_lm_hash + 7, 1);
282 memcpy(sess_key, p24, 16);
284 #ifdef DEBUG_PASSWORD
285 DEBUG(100, ("SMBsesskeygen_lm_sess_key: \n"));
286 dump_data(100, sess_key, 16);
290 DATA_BLOB NTLMv2_generate_names_blob(TALLOC_CTX *mem_ctx,
291 const char *hostname,
294 DATA_BLOB names_blob = data_blob_talloc(mem_ctx, NULL, 0);
296 msrpc_gen(mem_ctx, &names_blob, "aaa",
297 NTLMSSP_NAME_TYPE_DOMAIN, domain,
298 NTLMSSP_NAME_TYPE_SERVER, hostname,
303 static DATA_BLOB NTLMv2_generate_client_data(TALLOC_CTX *mem_ctx, const DATA_BLOB *names_blob)
305 uint8_t client_chal[8];
306 DATA_BLOB response = data_blob(NULL, 0);
307 uint8_t long_date[8];
310 unix_to_nt_time(&nttime, time(NULL));
312 generate_random_buffer(client_chal, sizeof(client_chal));
314 push_nttime(long_date, 0, nttime);
316 /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
318 msrpc_gen(mem_ctx, &response, "ddbbdb",
319 0x00000101, /* Header */
321 long_date, 8, /* Timestamp */
322 client_chal, 8, /* client challenge */
324 names_blob->data, names_blob->length); /* End of name list */
329 static DATA_BLOB NTLMv2_generate_response(TALLOC_CTX *out_mem_ctx,
330 const uint8_t ntlm_v2_hash[16],
331 const DATA_BLOB *server_chal,
332 const DATA_BLOB *names_blob)
334 uint8_t ntlmv2_response[16];
335 DATA_BLOB ntlmv2_client_data;
336 DATA_BLOB final_response;
338 TALLOC_CTX *mem_ctx = talloc_named(out_mem_ctx, 0,
339 "NTLMv2_generate_response internal context");
342 return data_blob(NULL, 0);
346 /* generate some data to pass into the response function - including
347 the hostname and domain name of the server */
348 ntlmv2_client_data = NTLMv2_generate_client_data(mem_ctx, names_blob);
350 /* Given that data, and the challenge from the server, generate a response */
351 SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &ntlmv2_client_data, ntlmv2_response);
353 final_response = data_blob_talloc(out_mem_ctx, NULL, sizeof(ntlmv2_response) + ntlmv2_client_data.length);
355 memcpy(final_response.data, ntlmv2_response, sizeof(ntlmv2_response));
357 memcpy(final_response.data+sizeof(ntlmv2_response),
358 ntlmv2_client_data.data, ntlmv2_client_data.length);
360 talloc_free(mem_ctx);
362 return final_response;
365 static DATA_BLOB LMv2_generate_response(TALLOC_CTX *mem_ctx,
366 const uint8_t ntlm_v2_hash[16],
367 const DATA_BLOB *server_chal)
369 uint8_t lmv2_response[16];
370 DATA_BLOB lmv2_client_data = data_blob_talloc(mem_ctx, NULL, 8);
371 DATA_BLOB final_response = data_blob_talloc(mem_ctx, NULL,24);
374 /* client-supplied random data */
375 generate_random_buffer(lmv2_client_data.data, lmv2_client_data.length);
377 /* Given that data, and the challenge from the server, generate a response */
378 SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &lmv2_client_data, lmv2_response);
379 memcpy(final_response.data, lmv2_response, sizeof(lmv2_response));
381 /* after the first 16 bytes is the random data we generated above,
382 so the server can verify us with it */
383 memcpy(final_response.data+sizeof(lmv2_response),
384 lmv2_client_data.data, lmv2_client_data.length);
386 data_blob_free(&lmv2_client_data);
388 return final_response;
391 BOOL SMBNTLMv2encrypt_hash(TALLOC_CTX *mem_ctx,
392 const char *user, const char *domain, const uint8_t nt_hash[16],
393 const DATA_BLOB *server_chal,
394 const DATA_BLOB *names_blob,
395 DATA_BLOB *lm_response, DATA_BLOB *nt_response,
396 DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key)
398 uint8_t ntlm_v2_hash[16];
400 /* We don't use the NT# directly. Instead we use it mashed up with
401 the username and domain.
402 This prevents username swapping during the auth exchange
404 if (!ntv2_owf_gen(nt_hash, user, domain, True, ntlm_v2_hash)) {
409 *nt_response = NTLMv2_generate_response(mem_ctx,
410 ntlm_v2_hash, server_chal,
412 if (user_session_key) {
413 *user_session_key = data_blob_talloc(mem_ctx, NULL, 16);
415 /* The NTLMv2 calculations also provide a session key, for signing etc later */
416 /* use only the first 16 bytes of nt_response for session key */
417 SMBsesskeygen_ntv2(ntlm_v2_hash, nt_response->data, user_session_key->data);
424 *lm_response = LMv2_generate_response(mem_ctx,
425 ntlm_v2_hash, server_chal);
426 if (lm_session_key) {
427 *lm_session_key = data_blob_talloc(mem_ctx, NULL, 16);
429 /* The NTLMv2 calculations also provide a session key, for signing etc later */
430 /* use only the first 16 bytes of lm_response for session key */
431 SMBsesskeygen_ntv2(ntlm_v2_hash, lm_response->data, lm_session_key->data);
438 BOOL SMBNTLMv2encrypt(TALLOC_CTX *mem_ctx,
439 const char *user, const char *domain,
440 const char *password,
441 const DATA_BLOB *server_chal,
442 const DATA_BLOB *names_blob,
443 DATA_BLOB *lm_response, DATA_BLOB *nt_response,
444 DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key)
447 E_md4hash(password, nt_hash);
449 return SMBNTLMv2encrypt_hash(mem_ctx,
450 user, domain, nt_hash, server_chal, names_blob,
451 lm_response, nt_response, lm_session_key, user_session_key);
454 /***********************************************************
455 encode a password buffer with a unicode password. The buffer
456 is filled with random data to make it harder to attack.
457 ************************************************************/
458 BOOL encode_pw_buffer(uint8_t buffer[516], const char *password, int string_flags)
463 new_pw_len = push_string(new_pw,
465 sizeof(new_pw), string_flags);
467 memcpy(&buffer[512 - new_pw_len], new_pw, new_pw_len);
469 generate_random_buffer(buffer, 512 - new_pw_len);
472 * The length of the new password is in the last 4 bytes of
475 SIVAL(buffer, 512, new_pw_len);
481 /***********************************************************
482 decode a password buffer
483 *new_pw_len is the length in bytes of the possibly mulitbyte
484 returned password including termination.
485 ************************************************************/
486 BOOL decode_pw_buffer(uint8_t in_buffer[516], char *new_pwrd,
487 int new_pwrd_size, uint32_t *new_pw_len,
493 Warning !!! : This function is called from some rpc call.
494 The password IN the buffer may be a UNICODE string.
495 The password IN new_pwrd is an ASCII string
496 If you reuse that code somewhere else check first.
499 /* The length of the new password is in the last 4 bytes of the data buffer. */
501 byte_len = IVAL(in_buffer, 512);
503 #ifdef DEBUG_PASSWORD
504 dump_data(100, in_buffer, 516);
507 /* Password cannot be longer than the size of the password buffer */
508 if ( (byte_len < 0) || (byte_len > 512)) {
512 /* decode into the return buffer. Buffer length supplied */
513 *new_pw_len = pull_string(new_pwrd, &in_buffer[512 - byte_len], new_pwrd_size,
514 byte_len, string_flags);
516 #ifdef DEBUG_PASSWORD
517 DEBUG(100,("decode_pw_buffer: new_pwrd: "));
518 dump_data(100, (const uint8_t *)new_pwrd, *new_pw_len);
519 DEBUG(100,("multibyte len:%d\n", *new_pw_len));
520 DEBUG(100,("original char len:%d\n", byte_len/2));