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 "lib/crypto/crypto.h"
32 This implements the X/Open SMB password encryption
33 It takes a password ('unix' string), a 8 byte "crypt key"
34 and puts 24 bytes of encrypted password into p24
36 Returns False if password must have been truncated to create LM hash
38 BOOL SMBencrypt(const char *passwd, const uint8_t *c8, uint8_t p24[24])
44 ret = E_deshash(passwd, p21);
46 SMBOWFencrypt(p21, c8, p24);
49 DEBUG(100,("SMBencrypt: lm#, challenge, response\n"));
50 dump_data(100, p21, 16);
51 dump_data(100, c8, 8);
52 dump_data(100, p24, 24);
59 * Creates the MD4 Hash of the users password in NT UNICODE.
60 * @param passwd password in 'unix' charset.
61 * @param p16 return password hashed with md4, caller allocated 16 byte buffer
64 void E_md4hash(const char *passwd, uint8_t p16[16])
69 len = push_ucs2_talloc(NULL, &wpwd, passwd);
73 mdfour(p16, wpwd, len);
79 * Creates the DES forward-only Hash of the users password in DOS ASCII charset
80 * @param passwd password in 'unix' charset.
81 * @param p16 return password hashed with DES, caller allocated 16 byte buffer
82 * @return False if password was > 14 characters, and therefore may be incorrect, otherwise True
83 * @note p16 is filled in regardless
86 BOOL E_deshash(const char *passwd, uint8_t p16[16])
92 /* Password must be converted to DOS charset - null terminated, uppercase. */
93 push_ascii(dospwd, passwd, sizeof(dospwd), STR_UPPER|STR_TERMINATE);
95 /* Only the fisrt 14 chars are considered, password need not be null terminated. */
96 E_P16((const uint8_t *)dospwd, p16);
98 if (strlen(dospwd) > 14) {
107 /* Does both the NTLMv2 owfs of a user's password */
108 BOOL ntv2_owf_gen(const uint8_t owf[16],
109 const char *user_in, const char *domain_in,
110 BOOL upper_case_domain, /* Transform the domain into UPPER case */
115 size_t user_byte_len;
116 size_t domain_byte_len;
119 TALLOC_CTX *mem_ctx = talloc_init("ntv2_owf_gen for %s\\%s", domain_in, user_in);
132 user_in = strupper_talloc(mem_ctx, user_in);
133 if (user_in == NULL) {
134 talloc_free(mem_ctx);
138 if (upper_case_domain) {
139 domain_in = strupper_talloc(mem_ctx, domain_in);
140 if (domain_in == NULL) {
141 talloc_free(mem_ctx);
146 user_byte_len = push_ucs2_talloc(mem_ctx, &user, user_in);
147 if (user_byte_len == (ssize_t)-1) {
148 DEBUG(0, ("push_uss2_talloc() for user returned -1 (probably talloc() failure)\n"));
149 talloc_free(mem_ctx);
153 domain_byte_len = push_ucs2_talloc(mem_ctx, &domain, domain_in);
154 if (domain_byte_len == (ssize_t)-1) {
155 DEBUG(0, ("push_ucs2_talloc() for domain returned -1 (probably talloc() failure)\n"));
156 talloc_free(mem_ctx);
160 SMB_ASSERT(user_byte_len >= 2);
161 SMB_ASSERT(domain_byte_len >= 2);
163 /* We don't want null termination */
164 user_byte_len = user_byte_len - 2;
165 domain_byte_len = domain_byte_len - 2;
167 hmac_md5_init_limK_to_64(owf, 16, &ctx);
168 hmac_md5_update(user, user_byte_len, &ctx);
169 hmac_md5_update(domain, domain_byte_len, &ctx);
170 hmac_md5_final(kr_buf, &ctx);
172 #ifdef DEBUG_PASSWORD
173 DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
174 dump_data(100, user, user_byte_len);
175 dump_data(100, domain, domain_byte_len);
176 dump_data(100, owf, 16);
177 dump_data(100, kr_buf, 16);
180 talloc_free(mem_ctx);
184 /* Does the des encryption from the NT or LM MD4 hash. */
185 void SMBOWFencrypt(const uint8_t passwd[16], const uint8_t *c8, uint8_t p24[24])
191 memcpy(p21, passwd, 16);
195 /* Does the NT MD4 hash then des encryption. */
197 void SMBNTencrypt(const char *passwd, uint8_t *c8, uint8_t *p24)
203 E_md4hash(passwd, p21);
204 SMBOWFencrypt(p21, c8, p24);
206 #ifdef DEBUG_PASSWORD
207 DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
208 dump_data(100, p21, 16);
209 dump_data(100, c8, 8);
210 dump_data(100, p24, 24);
214 /* Does the md5 encryption from the Key Response for NTLMv2. */
215 void SMBOWFencrypt_ntv2(const uint8_t kr[16],
216 const DATA_BLOB *srv_chal,
217 const DATA_BLOB *smbcli_chal,
218 uint8_t resp_buf[16])
222 hmac_md5_init_limK_to_64(kr, 16, &ctx);
223 hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
224 hmac_md5_update(smbcli_chal->data, smbcli_chal->length, &ctx);
225 hmac_md5_final(resp_buf, &ctx);
227 #ifdef DEBUG_PASSWORD
228 DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, smbcli_chal, resp_buf\n"));
229 dump_data(100, srv_chal->data, srv_chal->length);
230 dump_data(100, smbcli_chal->data, smbcli_chal->length);
231 dump_data(100, resp_buf, 16);
235 void SMBsesskeygen_ntv2(const uint8_t kr[16],
236 const uint8_t * nt_resp, uint8_t sess_key[16])
238 /* a very nice, 128 bit, variable session key */
242 hmac_md5_init_limK_to_64(kr, 16, &ctx);
243 hmac_md5_update(nt_resp, 16, &ctx);
244 hmac_md5_final((uint8_t *)sess_key, &ctx);
246 #ifdef DEBUG_PASSWORD
247 DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
248 dump_data(100, sess_key, 16);
252 void SMBsesskeygen_ntv1(const uint8_t kr[16], uint8_t sess_key[16])
254 /* yes, this session key does not change - yes, this
255 is a problem - but it is 128 bits */
257 mdfour((uint8_t *)sess_key, kr, 16);
259 #ifdef DEBUG_PASSWORD
260 DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
261 dump_data(100, sess_key, 16);
265 void SMBsesskeygen_lm_sess_key(const uint8_t lm_hash[16],
266 const uint8_t lm_resp[24], /* only uses 8 */
267 uint8_t sess_key[16])
269 /* Calculate the LM session key (effective length 40 bits,
270 but changes with each session) */
275 memcpy(p21, lm_hash, 8);
276 memset(p21 + 8, 0xbd, 8);
278 E_P24(p21, lm_resp, p24);
280 memcpy(sess_key, p24, 16);
282 #ifdef DEBUG_PASSWORD
283 DEBUG(100, ("SMBsesskeygen_lm_sess_key: \n"));
284 dump_data(100, sess_key, 16);
288 DATA_BLOB NTLMv2_generate_names_blob(TALLOC_CTX *mem_ctx,
289 const char *hostname,
292 DATA_BLOB names_blob = data_blob_talloc(mem_ctx, NULL, 0);
294 msrpc_gen(mem_ctx, &names_blob, "aaa",
295 NTLMSSP_NAME_TYPE_DOMAIN, domain,
296 NTLMSSP_NAME_TYPE_SERVER, hostname,
301 static DATA_BLOB NTLMv2_generate_client_data(TALLOC_CTX *mem_ctx, const DATA_BLOB *names_blob)
303 uint8_t client_chal[8];
304 DATA_BLOB response = data_blob(NULL, 0);
305 uint8_t long_date[8];
308 unix_to_nt_time(&nttime, time(NULL));
310 generate_random_buffer(client_chal, sizeof(client_chal));
312 push_nttime(long_date, 0, nttime);
314 /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
316 msrpc_gen(mem_ctx, &response, "ddbbdb",
317 0x00000101, /* Header */
319 long_date, 8, /* Timestamp */
320 client_chal, 8, /* client challenge */
322 names_blob->data, names_blob->length); /* End of name list */
327 static DATA_BLOB NTLMv2_generate_response(TALLOC_CTX *out_mem_ctx,
328 const uint8_t ntlm_v2_hash[16],
329 const DATA_BLOB *server_chal,
330 const DATA_BLOB *names_blob)
332 uint8_t ntlmv2_response[16];
333 DATA_BLOB ntlmv2_client_data;
334 DATA_BLOB final_response;
336 TALLOC_CTX *mem_ctx = talloc_named(out_mem_ctx, 0,
337 "NTLMv2_generate_response internal context");
340 return data_blob(NULL, 0);
344 /* generate some data to pass into the response function - including
345 the hostname and domain name of the server */
346 ntlmv2_client_data = NTLMv2_generate_client_data(mem_ctx, names_blob);
348 /* Given that data, and the challenge from the server, generate a response */
349 SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &ntlmv2_client_data, ntlmv2_response);
351 final_response = data_blob_talloc(out_mem_ctx, NULL, sizeof(ntlmv2_response) + ntlmv2_client_data.length);
353 memcpy(final_response.data, ntlmv2_response, sizeof(ntlmv2_response));
355 memcpy(final_response.data+sizeof(ntlmv2_response),
356 ntlmv2_client_data.data, ntlmv2_client_data.length);
358 talloc_free(mem_ctx);
360 return final_response;
363 static DATA_BLOB LMv2_generate_response(TALLOC_CTX *mem_ctx,
364 const uint8_t ntlm_v2_hash[16],
365 const DATA_BLOB *server_chal)
367 uint8_t lmv2_response[16];
368 DATA_BLOB lmv2_client_data = data_blob_talloc(mem_ctx, NULL, 8);
369 DATA_BLOB final_response = data_blob_talloc(mem_ctx, NULL,24);
372 /* client-supplied random data */
373 generate_random_buffer(lmv2_client_data.data, lmv2_client_data.length);
375 /* Given that data, and the challenge from the server, generate a response */
376 SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &lmv2_client_data, lmv2_response);
377 memcpy(final_response.data, lmv2_response, sizeof(lmv2_response));
379 /* after the first 16 bytes is the random data we generated above,
380 so the server can verify us with it */
381 memcpy(final_response.data+sizeof(lmv2_response),
382 lmv2_client_data.data, lmv2_client_data.length);
384 data_blob_free(&lmv2_client_data);
386 return final_response;
389 BOOL SMBNTLMv2encrypt_hash(TALLOC_CTX *mem_ctx,
390 const char *user, const char *domain, const uint8_t nt_hash[16],
391 const DATA_BLOB *server_chal,
392 const DATA_BLOB *names_blob,
393 DATA_BLOB *lm_response, DATA_BLOB *nt_response,
394 DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key)
396 uint8_t ntlm_v2_hash[16];
398 /* We don't use the NT# directly. Instead we use it mashed up with
399 the username and domain.
400 This prevents username swapping during the auth exchange
402 if (!ntv2_owf_gen(nt_hash, user, domain, True, ntlm_v2_hash)) {
407 *nt_response = NTLMv2_generate_response(mem_ctx,
408 ntlm_v2_hash, server_chal,
410 if (user_session_key) {
411 *user_session_key = data_blob_talloc(mem_ctx, NULL, 16);
413 /* The NTLMv2 calculations also provide a session key, for signing etc later */
414 /* use only the first 16 bytes of nt_response for session key */
415 SMBsesskeygen_ntv2(ntlm_v2_hash, nt_response->data, user_session_key->data);
422 *lm_response = LMv2_generate_response(mem_ctx,
423 ntlm_v2_hash, server_chal);
424 if (lm_session_key) {
425 *lm_session_key = data_blob_talloc(mem_ctx, NULL, 16);
427 /* The NTLMv2 calculations also provide a session key, for signing etc later */
428 /* use only the first 16 bytes of lm_response for session key */
429 SMBsesskeygen_ntv2(ntlm_v2_hash, lm_response->data, lm_session_key->data);
436 BOOL SMBNTLMv2encrypt(TALLOC_CTX *mem_ctx,
437 const char *user, const char *domain,
438 const char *password,
439 const DATA_BLOB *server_chal,
440 const DATA_BLOB *names_blob,
441 DATA_BLOB *lm_response, DATA_BLOB *nt_response,
442 DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key)
445 E_md4hash(password, nt_hash);
447 return SMBNTLMv2encrypt_hash(mem_ctx,
448 user, domain, nt_hash, server_chal, names_blob,
449 lm_response, nt_response, lm_session_key, user_session_key);
452 /***********************************************************
453 encode a password buffer with a unicode password. The buffer
454 is filled with random data to make it harder to attack.
455 ************************************************************/
456 BOOL encode_pw_buffer(uint8_t buffer[516], const char *password, int string_flags)
461 new_pw_len = push_string(new_pw,
463 sizeof(new_pw), string_flags);
465 memcpy(&buffer[512 - new_pw_len], new_pw, new_pw_len);
467 generate_random_buffer(buffer, 512 - new_pw_len);
470 * The length of the new password is in the last 4 bytes of
473 SIVAL(buffer, 512, new_pw_len);
479 /***********************************************************
480 decode a password buffer
481 *new_pw_len is the length in bytes of the possibly mulitbyte
482 returned password including termination.
483 ************************************************************/
484 BOOL decode_pw_buffer(uint8_t in_buffer[516], char *new_pwrd,
485 int new_pwrd_size, uint32_t *new_pw_len,
491 Warning !!! : This function is called from some rpc call.
492 The password IN the buffer may be a UNICODE string.
493 The password IN new_pwrd is an ASCII string
494 If you reuse that code somewhere else check first.
497 /* The length of the new password is in the last 4 bytes of the data buffer. */
499 byte_len = IVAL(in_buffer, 512);
501 #ifdef DEBUG_PASSWORD
502 dump_data(100, in_buffer, 516);
505 /* Password cannot be longer than the size of the password buffer */
506 if ( (byte_len < 0) || (byte_len > 512)) {
510 /* decode into the return buffer. Buffer length supplied */
511 *new_pw_len = pull_string(new_pwrd, &in_buffer[512 - byte_len], new_pwrd_size,
512 byte_len, string_flags);
514 #ifdef DEBUG_PASSWORD
515 DEBUG(100,("decode_pw_buffer: new_pwrd: "));
516 dump_data(100, (const uint8_t *)new_pwrd, *new_pw_len);
517 DEBUG(100,("multibyte len:%d\n", *new_pw_len));
518 DEBUG(100,("original char len:%d\n", byte_len/2));