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 3 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, see <http://www.gnu.org/licenses/>.
25 #include "system/time.h"
26 #include "auth/ntlmssp/ntlmssp.h"
27 #include "auth/ntlmssp/msrpc_parse.h"
28 #include "lib/crypto/crypto.h"
29 #include "libcli/auth/libcli_auth.h"
33 This implements the X/Open SMB password encryption
34 It takes a password ('unix' string), a 8 byte "crypt key"
35 and puts 24 bytes of encrypted password into p24
37 Returns false if password must have been truncated to create LM hash
39 bool SMBencrypt(const char *passwd, const uint8_t *c8, uint8_t p24[24])
45 ret = E_deshash(passwd, p21);
47 SMBOWFencrypt(p21, c8, p24);
50 DEBUG(100,("SMBencrypt: lm#, challenge, response\n"));
51 dump_data(100, p21, 16);
52 dump_data(100, c8, 8);
53 dump_data(100, p24, 24);
60 * Creates the MD4 Hash of the users password in NT UNICODE.
61 * @param passwd password in 'unix' charset.
62 * @param p16 return password hashed with md4, caller allocated 16 byte buffer
65 _PUBLIC_ bool E_md4hash(const char *passwd, uint8_t p16[16])
70 len = push_ucs2_talloc(NULL, &wpwd, passwd);
72 /* We don't want to return fixed data, as most callers
74 mdfour(p16, (const uint8_t *)passwd, strlen(passwd));
79 mdfour(p16, wpwd, len);
86 * Creates the DES forward-only Hash of the users password in DOS ASCII charset
87 * @param passwd password in 'unix' charset.
88 * @param p16 return password hashed with DES, caller allocated 16 byte buffer
89 * @return false if password was > 14 characters, and therefore may be incorrect, otherwise true
90 * @note p16 is filled in regardless
93 _PUBLIC_ bool E_deshash(const char *passwd, uint8_t p16[16])
99 /* Password must be converted to DOS charset - null terminated, uppercase. */
100 push_string(dospwd, passwd, sizeof(dospwd), STR_ASCII|STR_UPPER|STR_TERMINATE);
102 /* Only the fisrt 14 chars are considered, password need not be null terminated. */
103 E_P16((const uint8_t *)dospwd, p16);
105 if (strlen(dospwd) > 14) {
114 /* Does both the NTLMv2 owfs of a user's password */
115 bool ntv2_owf_gen(const uint8_t owf[16],
116 const char *user_in, const char *domain_in,
117 bool upper_case_domain, /* Transform the domain into UPPER case */
122 size_t user_byte_len;
123 size_t domain_byte_len;
126 TALLOC_CTX *mem_ctx = talloc_init("ntv2_owf_gen for %s\\%s", domain_in, user_in);
139 user_in = strupper_talloc(mem_ctx, user_in);
140 if (user_in == NULL) {
141 talloc_free(mem_ctx);
145 if (upper_case_domain) {
146 domain_in = strupper_talloc(mem_ctx, domain_in);
147 if (domain_in == NULL) {
148 talloc_free(mem_ctx);
153 user_byte_len = push_ucs2_talloc(mem_ctx, &user, user_in);
154 if (user_byte_len == (ssize_t)-1) {
155 DEBUG(0, ("push_uss2_talloc() for user returned -1 (probably talloc() failure)\n"));
156 talloc_free(mem_ctx);
160 domain_byte_len = push_ucs2_talloc(mem_ctx, &domain, domain_in);
161 if (domain_byte_len == (ssize_t)-1) {
162 DEBUG(0, ("push_ucs2_talloc() for domain returned -1 (probably talloc() failure)\n"));
163 talloc_free(mem_ctx);
167 SMB_ASSERT(user_byte_len >= 2);
168 SMB_ASSERT(domain_byte_len >= 2);
170 /* We don't want null termination */
171 user_byte_len = user_byte_len - 2;
172 domain_byte_len = domain_byte_len - 2;
174 hmac_md5_init_limK_to_64(owf, 16, &ctx);
175 hmac_md5_update(user, user_byte_len, &ctx);
176 hmac_md5_update(domain, domain_byte_len, &ctx);
177 hmac_md5_final(kr_buf, &ctx);
179 #ifdef DEBUG_PASSWORD
180 DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
181 dump_data(100, user, user_byte_len);
182 dump_data(100, domain, domain_byte_len);
183 dump_data(100, owf, 16);
184 dump_data(100, kr_buf, 16);
187 talloc_free(mem_ctx);
191 /* Does the des encryption from the NT or LM MD4 hash. */
192 void SMBOWFencrypt(const uint8_t passwd[16], const uint8_t *c8, uint8_t p24[24])
198 memcpy(p21, passwd, 16);
202 /* Does the NT MD4 hash then des encryption. */
204 void SMBNTencrypt(const char *passwd, uint8_t *c8, uint8_t *p24)
210 E_md4hash(passwd, p21);
211 SMBOWFencrypt(p21, c8, p24);
213 #ifdef DEBUG_PASSWORD
214 DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
215 dump_data(100, p21, 16);
216 dump_data(100, c8, 8);
217 dump_data(100, p24, 24);
221 /* Does the md5 encryption from the Key Response for NTLMv2. */
222 void SMBOWFencrypt_ntv2(const uint8_t kr[16],
223 const DATA_BLOB *srv_chal,
224 const DATA_BLOB *smbcli_chal,
225 uint8_t resp_buf[16])
229 hmac_md5_init_limK_to_64(kr, 16, &ctx);
230 hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
231 hmac_md5_update(smbcli_chal->data, smbcli_chal->length, &ctx);
232 hmac_md5_final(resp_buf, &ctx);
234 #ifdef DEBUG_PASSWORD
235 DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, smbcli_chal, resp_buf\n"));
236 dump_data(100, srv_chal->data, srv_chal->length);
237 dump_data(100, smbcli_chal->data, smbcli_chal->length);
238 dump_data(100, resp_buf, 16);
242 void SMBsesskeygen_ntv2(const uint8_t kr[16],
243 const uint8_t * nt_resp, uint8_t sess_key[16])
245 /* a very nice, 128 bit, variable session key */
249 hmac_md5_init_limK_to_64(kr, 16, &ctx);
250 hmac_md5_update(nt_resp, 16, &ctx);
251 hmac_md5_final((uint8_t *)sess_key, &ctx);
253 #ifdef DEBUG_PASSWORD
254 DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
255 dump_data(100, sess_key, 16);
259 void SMBsesskeygen_ntv1(const uint8_t kr[16], uint8_t sess_key[16])
261 /* yes, this session key does not change - yes, this
262 is a problem - but it is 128 bits */
264 mdfour((uint8_t *)sess_key, kr, 16);
266 #ifdef DEBUG_PASSWORD
267 DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
268 dump_data(100, sess_key, 16);
272 void SMBsesskeygen_lm_sess_key(const uint8_t lm_hash[16],
273 const uint8_t lm_resp[24], /* only uses 8 */
274 uint8_t sess_key[16])
276 /* Calculate the LM session key (effective length 40 bits,
277 but changes with each session) */
279 uint8_t partial_lm_hash[14];
281 memcpy(partial_lm_hash, lm_hash, 8);
282 memset(partial_lm_hash + 8, 0xbd, 6);
284 des_crypt56(p24, lm_resp, partial_lm_hash, 1);
285 des_crypt56(p24+8, lm_resp, partial_lm_hash + 7, 1);
287 memcpy(sess_key, p24, 16);
289 #ifdef DEBUG_PASSWORD
290 DEBUG(100, ("SMBsesskeygen_lm_sess_key: \n"));
291 dump_data(100, sess_key, 16);
295 DATA_BLOB NTLMv2_generate_names_blob(TALLOC_CTX *mem_ctx,
296 const char *hostname,
299 DATA_BLOB names_blob = data_blob_talloc(mem_ctx, NULL, 0);
301 msrpc_gen(mem_ctx, &names_blob, "aaa",
302 NTLMSSP_NAME_TYPE_DOMAIN, domain,
303 NTLMSSP_NAME_TYPE_SERVER, hostname,
308 static DATA_BLOB NTLMv2_generate_client_data(TALLOC_CTX *mem_ctx, const DATA_BLOB *names_blob)
310 uint8_t client_chal[8];
311 DATA_BLOB response = data_blob(NULL, 0);
312 uint8_t long_date[8];
315 unix_to_nt_time(&nttime, time(NULL));
317 generate_random_buffer(client_chal, sizeof(client_chal));
319 push_nttime(long_date, 0, nttime);
321 /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
323 msrpc_gen(mem_ctx, &response, "ddbbdb",
324 0x00000101, /* Header */
326 long_date, 8, /* Timestamp */
327 client_chal, 8, /* client challenge */
329 names_blob->data, names_blob->length); /* End of name list */
334 static DATA_BLOB NTLMv2_generate_response(TALLOC_CTX *out_mem_ctx,
335 const uint8_t ntlm_v2_hash[16],
336 const DATA_BLOB *server_chal,
337 const DATA_BLOB *names_blob)
339 uint8_t ntlmv2_response[16];
340 DATA_BLOB ntlmv2_client_data;
341 DATA_BLOB final_response;
343 TALLOC_CTX *mem_ctx = talloc_named(out_mem_ctx, 0,
344 "NTLMv2_generate_response internal context");
347 return data_blob(NULL, 0);
351 /* generate some data to pass into the response function - including
352 the hostname and domain name of the server */
353 ntlmv2_client_data = NTLMv2_generate_client_data(mem_ctx, names_blob);
355 /* Given that data, and the challenge from the server, generate a response */
356 SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &ntlmv2_client_data, ntlmv2_response);
358 final_response = data_blob_talloc(out_mem_ctx, NULL, sizeof(ntlmv2_response) + ntlmv2_client_data.length);
360 memcpy(final_response.data, ntlmv2_response, sizeof(ntlmv2_response));
362 memcpy(final_response.data+sizeof(ntlmv2_response),
363 ntlmv2_client_data.data, ntlmv2_client_data.length);
365 talloc_free(mem_ctx);
367 return final_response;
370 static DATA_BLOB LMv2_generate_response(TALLOC_CTX *mem_ctx,
371 const uint8_t ntlm_v2_hash[16],
372 const DATA_BLOB *server_chal)
374 uint8_t lmv2_response[16];
375 DATA_BLOB lmv2_client_data = data_blob_talloc(mem_ctx, NULL, 8);
376 DATA_BLOB final_response = data_blob_talloc(mem_ctx, NULL,24);
379 /* client-supplied random data */
380 generate_random_buffer(lmv2_client_data.data, lmv2_client_data.length);
382 /* Given that data, and the challenge from the server, generate a response */
383 SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &lmv2_client_data, lmv2_response);
384 memcpy(final_response.data, lmv2_response, sizeof(lmv2_response));
386 /* after the first 16 bytes is the random data we generated above,
387 so the server can verify us with it */
388 memcpy(final_response.data+sizeof(lmv2_response),
389 lmv2_client_data.data, lmv2_client_data.length);
391 data_blob_free(&lmv2_client_data);
393 return final_response;
396 bool SMBNTLMv2encrypt_hash(TALLOC_CTX *mem_ctx,
397 const char *user, const char *domain, const uint8_t nt_hash[16],
398 const DATA_BLOB *server_chal,
399 const DATA_BLOB *names_blob,
400 DATA_BLOB *lm_response, DATA_BLOB *nt_response,
401 DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key)
403 uint8_t ntlm_v2_hash[16];
405 /* We don't use the NT# directly. Instead we use it mashed up with
406 the username and domain.
407 This prevents username swapping during the auth exchange
409 if (!ntv2_owf_gen(nt_hash, user, domain, true, ntlm_v2_hash)) {
414 *nt_response = NTLMv2_generate_response(mem_ctx,
415 ntlm_v2_hash, server_chal,
417 if (user_session_key) {
418 *user_session_key = data_blob_talloc(mem_ctx, NULL, 16);
420 /* The NTLMv2 calculations also provide a session key, for signing etc later */
421 /* use only the first 16 bytes of nt_response for session key */
422 SMBsesskeygen_ntv2(ntlm_v2_hash, nt_response->data, user_session_key->data);
429 *lm_response = LMv2_generate_response(mem_ctx,
430 ntlm_v2_hash, server_chal);
431 if (lm_session_key) {
432 *lm_session_key = data_blob_talloc(mem_ctx, NULL, 16);
434 /* The NTLMv2 calculations also provide a session key, for signing etc later */
435 /* use only the first 16 bytes of lm_response for session key */
436 SMBsesskeygen_ntv2(ntlm_v2_hash, lm_response->data, lm_session_key->data);
443 bool SMBNTLMv2encrypt(TALLOC_CTX *mem_ctx,
444 const char *user, const char *domain,
445 const char *password,
446 const DATA_BLOB *server_chal,
447 const DATA_BLOB *names_blob,
448 DATA_BLOB *lm_response, DATA_BLOB *nt_response,
449 DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key)
452 E_md4hash(password, nt_hash);
454 return SMBNTLMv2encrypt_hash(mem_ctx,
455 user, domain, nt_hash, server_chal, names_blob,
456 lm_response, nt_response, lm_session_key, user_session_key);
459 /***********************************************************
460 encode a password buffer with a unicode password. The buffer
461 is filled with random data to make it harder to attack.
462 ************************************************************/
463 bool encode_pw_buffer(uint8_t buffer[516], const char *password, int string_flags)
468 /* the incoming buffer can be any alignment. */
469 string_flags |= STR_NOALIGN;
471 new_pw_len = push_string(new_pw,
473 sizeof(new_pw), string_flags);
475 memcpy(&buffer[512 - new_pw_len], new_pw, new_pw_len);
477 generate_random_buffer(buffer, 512 - new_pw_len);
480 * The length of the new password is in the last 4 bytes of
483 SIVAL(buffer, 512, new_pw_len);
489 /***********************************************************
490 decode a password buffer
491 *new_pw_len is the length in bytes of the possibly mulitbyte
492 returned password including termination.
493 ************************************************************/
494 bool decode_pw_buffer(uint8_t in_buffer[516], char *new_pwrd,
495 int new_pwrd_size, uint32_t *new_pw_len,
500 /* the incoming buffer can be any alignment. */
501 string_flags |= STR_NOALIGN;
504 Warning !!! : This function is called from some rpc call.
505 The password IN the buffer may be a UNICODE string.
506 The password IN new_pwrd is an ASCII string
507 If you reuse that code somewhere else check first.
510 /* The length of the new password is in the last 4 bytes of the data buffer. */
512 byte_len = IVAL(in_buffer, 512);
514 #ifdef DEBUG_PASSWORD
515 dump_data(100, in_buffer, 516);
518 /* Password cannot be longer than the size of the password buffer */
519 if ( (byte_len < 0) || (byte_len > 512)) {
523 /* decode into the return buffer. Buffer length supplied */
524 *new_pw_len = pull_string(new_pwrd, &in_buffer[512 - byte_len], new_pwrd_size,
525 byte_len, string_flags);
527 #ifdef DEBUG_PASSWORD
528 DEBUG(100,("decode_pw_buffer: new_pwrd: "));
529 dump_data(100, (const uint8_t *)new_pwrd, *new_pw_len);
530 DEBUG(100,("multibyte len:%d\n", *new_pw_len));
531 DEBUG(100,("original char len:%d\n", byte_len/2));