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"
28 #include "auth/ntlmssp/ntlmssp.h"
29 #include "auth/ntlmssp/msrpc_parse.h"
30 #include "lib/crypto/crypto.h"
31 #include "libcli/auth/libcli_auth.h"
35 This implements the X/Open SMB password encryption
36 It takes a password ('unix' string), a 8 byte "crypt key"
37 and puts 24 bytes of encrypted password into p24
39 Returns False if password must have been truncated to create LM hash
41 BOOL SMBencrypt(const char *passwd, const uint8_t *c8, uint8_t p24[24])
47 ret = E_deshash(passwd, p21);
49 SMBOWFencrypt(p21, c8, p24);
52 DEBUG(100,("SMBencrypt: lm#, challenge, response\n"));
53 dump_data(100, p21, 16);
54 dump_data(100, c8, 8);
55 dump_data(100, p24, 24);
62 * Creates the MD4 Hash of the users password in NT UNICODE.
63 * @param passwd password in 'unix' charset.
64 * @param p16 return password hashed with md4, caller allocated 16 byte buffer
67 void E_md4hash(const char *passwd, uint8_t p16[16])
72 len = push_ucs2_talloc(NULL, &wpwd, passwd);
76 mdfour(p16, wpwd, len);
82 * Creates the DES forward-only Hash of the users password in DOS ASCII charset
83 * @param passwd password in 'unix' charset.
84 * @param p16 return password hashed with DES, caller allocated 16 byte buffer
85 * @return False if password was > 14 characters, and therefore may be incorrect, otherwise True
86 * @note p16 is filled in regardless
89 BOOL E_deshash(const char *passwd, uint8_t p16[16])
95 /* Password must be converted to DOS charset - null terminated, uppercase. */
96 push_ascii(dospwd, passwd, sizeof(dospwd), STR_UPPER|STR_TERMINATE);
98 /* Only the fisrt 14 chars are considered, password need not be null terminated. */
99 E_P16((const uint8_t *)dospwd, p16);
101 if (strlen(dospwd) > 14) {
110 /* Does both the NTLMv2 owfs of a user's password */
111 BOOL ntv2_owf_gen(const uint8_t owf[16],
112 const char *user_in, const char *domain_in,
113 BOOL upper_case_domain, /* Transform the domain into UPPER case */
118 size_t user_byte_len;
119 size_t domain_byte_len;
122 TALLOC_CTX *mem_ctx = talloc_init("ntv2_owf_gen for %s\\%s", domain_in, user_in);
135 user_in = strupper_talloc(mem_ctx, user_in);
136 if (user_in == NULL) {
137 talloc_free(mem_ctx);
141 if (upper_case_domain) {
142 domain_in = strupper_talloc(mem_ctx, domain_in);
143 if (domain_in == NULL) {
144 talloc_free(mem_ctx);
149 user_byte_len = push_ucs2_talloc(mem_ctx, &user, user_in);
150 if (user_byte_len == (ssize_t)-1) {
151 DEBUG(0, ("push_uss2_talloc() for user returned -1 (probably talloc() failure)\n"));
152 talloc_free(mem_ctx);
156 domain_byte_len = push_ucs2_talloc(mem_ctx, &domain, domain_in);
157 if (domain_byte_len == (ssize_t)-1) {
158 DEBUG(0, ("push_ucs2_talloc() for domain returned -1 (probably talloc() failure)\n"));
159 talloc_free(mem_ctx);
163 SMB_ASSERT(user_byte_len >= 2);
164 SMB_ASSERT(domain_byte_len >= 2);
166 /* We don't want null termination */
167 user_byte_len = user_byte_len - 2;
168 domain_byte_len = domain_byte_len - 2;
170 hmac_md5_init_limK_to_64(owf, 16, &ctx);
171 hmac_md5_update(user, user_byte_len, &ctx);
172 hmac_md5_update(domain, domain_byte_len, &ctx);
173 hmac_md5_final(kr_buf, &ctx);
175 #ifdef DEBUG_PASSWORD
176 DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
177 dump_data(100, user, user_byte_len);
178 dump_data(100, domain, domain_byte_len);
179 dump_data(100, owf, 16);
180 dump_data(100, kr_buf, 16);
183 talloc_free(mem_ctx);
187 /* Does the des encryption from the NT or LM MD4 hash. */
188 void SMBOWFencrypt(const uint8_t passwd[16], const uint8_t *c8, uint8_t p24[24])
194 memcpy(p21, passwd, 16);
198 /* Does the NT MD4 hash then des encryption. */
200 void SMBNTencrypt(const char *passwd, uint8_t *c8, uint8_t *p24)
206 E_md4hash(passwd, p21);
207 SMBOWFencrypt(p21, c8, p24);
209 #ifdef DEBUG_PASSWORD
210 DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
211 dump_data(100, p21, 16);
212 dump_data(100, c8, 8);
213 dump_data(100, p24, 24);
217 /* Does the md5 encryption from the Key Response for NTLMv2. */
218 void SMBOWFencrypt_ntv2(const uint8_t kr[16],
219 const DATA_BLOB *srv_chal,
220 const DATA_BLOB *smbcli_chal,
221 uint8_t resp_buf[16])
225 hmac_md5_init_limK_to_64(kr, 16, &ctx);
226 hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
227 hmac_md5_update(smbcli_chal->data, smbcli_chal->length, &ctx);
228 hmac_md5_final(resp_buf, &ctx);
230 #ifdef DEBUG_PASSWORD
231 DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, smbcli_chal, resp_buf\n"));
232 dump_data(100, srv_chal->data, srv_chal->length);
233 dump_data(100, smbcli_chal->data, smbcli_chal->length);
234 dump_data(100, resp_buf, 16);
238 void SMBsesskeygen_ntv2(const uint8_t kr[16],
239 const uint8_t * nt_resp, uint8_t sess_key[16])
241 /* a very nice, 128 bit, variable session key */
245 hmac_md5_init_limK_to_64(kr, 16, &ctx);
246 hmac_md5_update(nt_resp, 16, &ctx);
247 hmac_md5_final((uint8_t *)sess_key, &ctx);
249 #ifdef DEBUG_PASSWORD
250 DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
251 dump_data(100, sess_key, 16);
255 void SMBsesskeygen_ntv1(const uint8_t kr[16], uint8_t sess_key[16])
257 /* yes, this session key does not change - yes, this
258 is a problem - but it is 128 bits */
260 mdfour((uint8_t *)sess_key, kr, 16);
262 #ifdef DEBUG_PASSWORD
263 DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
264 dump_data(100, sess_key, 16);
268 void SMBsesskeygen_lm_sess_key(const uint8_t lm_hash[16],
269 const uint8_t lm_resp[24], /* only uses 8 */
270 uint8_t sess_key[16])
272 /* Calculate the LM session key (effective length 40 bits,
273 but changes with each session) */
275 uint8_t partial_lm_hash[14];
277 memcpy(partial_lm_hash, lm_hash, 8);
278 memset(partial_lm_hash + 8, 0xbd, 6);
280 des_crypt56(p24, lm_resp, partial_lm_hash, 1);
281 des_crypt56(p24+8, lm_resp, partial_lm_hash + 7, 1);
283 memcpy(sess_key, p24, 16);
285 #ifdef DEBUG_PASSWORD
286 DEBUG(100, ("SMBsesskeygen_lm_sess_key: \n"));
287 dump_data(100, sess_key, 16);
291 DATA_BLOB NTLMv2_generate_names_blob(TALLOC_CTX *mem_ctx,
292 const char *hostname,
295 DATA_BLOB names_blob = data_blob_talloc(mem_ctx, NULL, 0);
297 msrpc_gen(mem_ctx, &names_blob, "aaa",
298 NTLMSSP_NAME_TYPE_DOMAIN, domain,
299 NTLMSSP_NAME_TYPE_SERVER, hostname,
304 static DATA_BLOB NTLMv2_generate_client_data(TALLOC_CTX *mem_ctx, const DATA_BLOB *names_blob)
306 uint8_t client_chal[8];
307 DATA_BLOB response = data_blob(NULL, 0);
308 uint8_t long_date[8];
311 unix_to_nt_time(&nttime, time(NULL));
313 generate_random_buffer(client_chal, sizeof(client_chal));
315 push_nttime(long_date, 0, nttime);
317 /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
319 msrpc_gen(mem_ctx, &response, "ddbbdb",
320 0x00000101, /* Header */
322 long_date, 8, /* Timestamp */
323 client_chal, 8, /* client challenge */
325 names_blob->data, names_blob->length); /* End of name list */
330 static DATA_BLOB NTLMv2_generate_response(TALLOC_CTX *out_mem_ctx,
331 const uint8_t ntlm_v2_hash[16],
332 const DATA_BLOB *server_chal,
333 const DATA_BLOB *names_blob)
335 uint8_t ntlmv2_response[16];
336 DATA_BLOB ntlmv2_client_data;
337 DATA_BLOB final_response;
339 TALLOC_CTX *mem_ctx = talloc_named(out_mem_ctx, 0,
340 "NTLMv2_generate_response internal context");
343 return data_blob(NULL, 0);
347 /* generate some data to pass into the response function - including
348 the hostname and domain name of the server */
349 ntlmv2_client_data = NTLMv2_generate_client_data(mem_ctx, names_blob);
351 /* Given that data, and the challenge from the server, generate a response */
352 SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &ntlmv2_client_data, ntlmv2_response);
354 final_response = data_blob_talloc(out_mem_ctx, NULL, sizeof(ntlmv2_response) + ntlmv2_client_data.length);
356 memcpy(final_response.data, ntlmv2_response, sizeof(ntlmv2_response));
358 memcpy(final_response.data+sizeof(ntlmv2_response),
359 ntlmv2_client_data.data, ntlmv2_client_data.length);
361 talloc_free(mem_ctx);
363 return final_response;
366 static DATA_BLOB LMv2_generate_response(TALLOC_CTX *mem_ctx,
367 const uint8_t ntlm_v2_hash[16],
368 const DATA_BLOB *server_chal)
370 uint8_t lmv2_response[16];
371 DATA_BLOB lmv2_client_data = data_blob_talloc(mem_ctx, NULL, 8);
372 DATA_BLOB final_response = data_blob_talloc(mem_ctx, NULL,24);
375 /* client-supplied random data */
376 generate_random_buffer(lmv2_client_data.data, lmv2_client_data.length);
378 /* Given that data, and the challenge from the server, generate a response */
379 SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &lmv2_client_data, lmv2_response);
380 memcpy(final_response.data, lmv2_response, sizeof(lmv2_response));
382 /* after the first 16 bytes is the random data we generated above,
383 so the server can verify us with it */
384 memcpy(final_response.data+sizeof(lmv2_response),
385 lmv2_client_data.data, lmv2_client_data.length);
387 data_blob_free(&lmv2_client_data);
389 return final_response;
392 BOOL SMBNTLMv2encrypt_hash(TALLOC_CTX *mem_ctx,
393 const char *user, const char *domain, const uint8_t nt_hash[16],
394 const DATA_BLOB *server_chal,
395 const DATA_BLOB *names_blob,
396 DATA_BLOB *lm_response, DATA_BLOB *nt_response,
397 DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key)
399 uint8_t ntlm_v2_hash[16];
401 /* We don't use the NT# directly. Instead we use it mashed up with
402 the username and domain.
403 This prevents username swapping during the auth exchange
405 if (!ntv2_owf_gen(nt_hash, user, domain, True, ntlm_v2_hash)) {
410 *nt_response = NTLMv2_generate_response(mem_ctx,
411 ntlm_v2_hash, server_chal,
413 if (user_session_key) {
414 *user_session_key = data_blob_talloc(mem_ctx, NULL, 16);
416 /* The NTLMv2 calculations also provide a session key, for signing etc later */
417 /* use only the first 16 bytes of nt_response for session key */
418 SMBsesskeygen_ntv2(ntlm_v2_hash, nt_response->data, user_session_key->data);
425 *lm_response = LMv2_generate_response(mem_ctx,
426 ntlm_v2_hash, server_chal);
427 if (lm_session_key) {
428 *lm_session_key = data_blob_talloc(mem_ctx, NULL, 16);
430 /* The NTLMv2 calculations also provide a session key, for signing etc later */
431 /* use only the first 16 bytes of lm_response for session key */
432 SMBsesskeygen_ntv2(ntlm_v2_hash, lm_response->data, lm_session_key->data);
439 BOOL SMBNTLMv2encrypt(TALLOC_CTX *mem_ctx,
440 const char *user, const char *domain,
441 const char *password,
442 const DATA_BLOB *server_chal,
443 const DATA_BLOB *names_blob,
444 DATA_BLOB *lm_response, DATA_BLOB *nt_response,
445 DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key)
448 E_md4hash(password, nt_hash);
450 return SMBNTLMv2encrypt_hash(mem_ctx,
451 user, domain, nt_hash, server_chal, names_blob,
452 lm_response, nt_response, lm_session_key, user_session_key);
455 /***********************************************************
456 encode a password buffer with a unicode password. The buffer
457 is filled with random data to make it harder to attack.
458 ************************************************************/
459 BOOL encode_pw_buffer(uint8_t buffer[516], const char *password, int string_flags)
464 new_pw_len = push_string(new_pw,
466 sizeof(new_pw), string_flags);
468 memcpy(&buffer[512 - new_pw_len], new_pw, new_pw_len);
470 generate_random_buffer(buffer, 512 - new_pw_len);
473 * The length of the new password is in the last 4 bytes of
476 SIVAL(buffer, 512, new_pw_len);
482 /***********************************************************
483 decode a password buffer
484 *new_pw_len is the length in bytes of the possibly mulitbyte
485 returned password including termination.
486 ************************************************************/
487 BOOL decode_pw_buffer(uint8_t in_buffer[516], char *new_pwrd,
488 int new_pwrd_size, uint32_t *new_pw_len,
494 Warning !!! : This function is called from some rpc call.
495 The password IN the buffer may be a UNICODE string.
496 The password IN new_pwrd is an ASCII string
497 If you reuse that code somewhere else check first.
500 /* The length of the new password is in the last 4 bytes of the data buffer. */
502 byte_len = IVAL(in_buffer, 512);
504 #ifdef DEBUG_PASSWORD
505 dump_data(100, in_buffer, 516);
508 /* Password cannot be longer than the size of the password buffer */
509 if ( (byte_len < 0) || (byte_len > 512)) {
513 /* decode into the return buffer. Buffer length supplied */
514 *new_pw_len = pull_string(new_pwrd, &in_buffer[512 - byte_len], new_pwrd_size,
515 byte_len, string_flags);
517 #ifdef DEBUG_PASSWORD
518 DEBUG(100,("decode_pw_buffer: new_pwrd: "));
519 dump_data(100, (const uint8_t *)new_pwrd, *new_pw_len);
520 DEBUG(100,("multibyte len:%d\n", *new_pw_len));
521 DEBUG(100,("original char len:%d\n", byte_len/2));