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 "lib/crypto/crypto.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 void E_md4hash(const char *passwd, uint8_t p16[16])
70 len = push_ucs2_talloc(NULL, &wpwd, passwd);
74 mdfour(p16, wpwd, len);
80 * Creates the DES forward-only Hash of the users password in DOS ASCII charset
81 * @param passwd password in 'unix' charset.
82 * @param p16 return password hashed with DES, caller allocated 16 byte buffer
83 * @return False if password was > 14 characters, and therefore may be incorrect, otherwise True
84 * @note p16 is filled in regardless
87 BOOL E_deshash(const char *passwd, uint8_t p16[16])
93 /* Password must be converted to DOS charset - null terminated, uppercase. */
94 push_ascii(dospwd, passwd, sizeof(dospwd), STR_UPPER|STR_TERMINATE);
96 /* Only the fisrt 14 chars are considered, password need not be null terminated. */
97 E_P16((const uint8_t *)dospwd, p16);
99 if (strlen(dospwd) > 14) {
108 /* Does both the NTLMv2 owfs of a user's password */
109 BOOL ntv2_owf_gen(const uint8_t owf[16],
110 const char *user_in, const char *domain_in,
111 BOOL upper_case_domain, /* Transform the domain into UPPER case */
116 size_t user_byte_len;
117 size_t domain_byte_len;
120 TALLOC_CTX *mem_ctx = talloc_init("ntv2_owf_gen for %s\\%s", domain_in, user_in);
133 user_in = strupper_talloc(mem_ctx, user_in);
134 if (user_in == NULL) {
135 talloc_free(mem_ctx);
139 if (upper_case_domain) {
140 domain_in = strupper_talloc(mem_ctx, domain_in);
141 if (domain_in == NULL) {
142 talloc_free(mem_ctx);
147 user_byte_len = push_ucs2_talloc(mem_ctx, &user, user_in);
148 if (user_byte_len == (ssize_t)-1) {
149 DEBUG(0, ("push_uss2_talloc() for user returned -1 (probably talloc() failure)\n"));
150 talloc_free(mem_ctx);
154 domain_byte_len = push_ucs2_talloc(mem_ctx, &domain, domain_in);
155 if (domain_byte_len == (ssize_t)-1) {
156 DEBUG(0, ("push_ucs2_talloc() for domain returned -1 (probably talloc() failure)\n"));
157 talloc_free(mem_ctx);
161 SMB_ASSERT(user_byte_len >= 2);
162 SMB_ASSERT(domain_byte_len >= 2);
164 /* We don't want null termination */
165 user_byte_len = user_byte_len - 2;
166 domain_byte_len = domain_byte_len - 2;
168 hmac_md5_init_limK_to_64(owf, 16, &ctx);
169 hmac_md5_update(user, user_byte_len, &ctx);
170 hmac_md5_update(domain, domain_byte_len, &ctx);
171 hmac_md5_final(kr_buf, &ctx);
173 #ifdef DEBUG_PASSWORD
174 DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
175 dump_data(100, user, user_byte_len);
176 dump_data(100, domain, domain_byte_len);
177 dump_data(100, owf, 16);
178 dump_data(100, kr_buf, 16);
181 talloc_free(mem_ctx);
185 /* Does the des encryption from the NT or LM MD4 hash. */
186 void SMBOWFencrypt(const uint8_t passwd[16], const uint8_t *c8, uint8_t p24[24])
192 memcpy(p21, passwd, 16);
196 /* Does the NT MD4 hash then des encryption. */
198 void SMBNTencrypt(const char *passwd, uint8_t *c8, uint8_t *p24)
204 E_md4hash(passwd, p21);
205 SMBOWFencrypt(p21, c8, p24);
207 #ifdef DEBUG_PASSWORD
208 DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
209 dump_data(100, p21, 16);
210 dump_data(100, c8, 8);
211 dump_data(100, p24, 24);
215 /* Does the md5 encryption from the Key Response for NTLMv2. */
216 void SMBOWFencrypt_ntv2(const uint8_t kr[16],
217 const DATA_BLOB *srv_chal,
218 const DATA_BLOB *smbcli_chal,
219 uint8_t resp_buf[16])
223 hmac_md5_init_limK_to_64(kr, 16, &ctx);
224 hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
225 hmac_md5_update(smbcli_chal->data, smbcli_chal->length, &ctx);
226 hmac_md5_final(resp_buf, &ctx);
228 #ifdef DEBUG_PASSWORD
229 DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, smbcli_chal, resp_buf\n"));
230 dump_data(100, srv_chal->data, srv_chal->length);
231 dump_data(100, smbcli_chal->data, smbcli_chal->length);
232 dump_data(100, resp_buf, 16);
236 void SMBsesskeygen_ntv2(const uint8_t kr[16],
237 const uint8_t * nt_resp, uint8_t sess_key[16])
239 /* a very nice, 128 bit, variable session key */
243 hmac_md5_init_limK_to_64(kr, 16, &ctx);
244 hmac_md5_update(nt_resp, 16, &ctx);
245 hmac_md5_final((uint8_t *)sess_key, &ctx);
247 #ifdef DEBUG_PASSWORD
248 DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
249 dump_data(100, sess_key, 16);
253 void SMBsesskeygen_ntv1(const uint8_t kr[16], uint8_t sess_key[16])
255 /* yes, this session key does not change - yes, this
256 is a problem - but it is 128 bits */
258 mdfour((uint8_t *)sess_key, kr, 16);
260 #ifdef DEBUG_PASSWORD
261 DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
262 dump_data(100, sess_key, 16);
266 void SMBsesskeygen_lm_sess_key(const uint8_t lm_hash[16],
267 const uint8_t lm_resp[24], /* only uses 8 */
268 uint8_t sess_key[16])
270 /* Calculate the LM session key (effective length 40 bits,
271 but changes with each session) */
273 uint8_t partial_lm_hash[14];
275 memcpy(partial_lm_hash, lm_hash, 8);
276 memset(partial_lm_hash + 8, 0xbd, 6);
278 des_crypt56(p24, lm_resp, partial_lm_hash, 1);
279 des_crypt56(p24+8, lm_resp, partial_lm_hash + 7, 1);
281 memcpy(sess_key, p24, 16);
283 #ifdef DEBUG_PASSWORD
284 DEBUG(100, ("SMBsesskeygen_lm_sess_key: \n"));
285 dump_data(100, sess_key, 16);
289 DATA_BLOB NTLMv2_generate_names_blob(TALLOC_CTX *mem_ctx,
290 const char *hostname,
293 DATA_BLOB names_blob = data_blob_talloc(mem_ctx, NULL, 0);
295 msrpc_gen(mem_ctx, &names_blob, "aaa",
296 NTLMSSP_NAME_TYPE_DOMAIN, domain,
297 NTLMSSP_NAME_TYPE_SERVER, hostname,
302 static DATA_BLOB NTLMv2_generate_client_data(TALLOC_CTX *mem_ctx, const DATA_BLOB *names_blob)
304 uint8_t client_chal[8];
305 DATA_BLOB response = data_blob(NULL, 0);
306 uint8_t long_date[8];
309 unix_to_nt_time(&nttime, time(NULL));
311 generate_random_buffer(client_chal, sizeof(client_chal));
313 push_nttime(long_date, 0, nttime);
315 /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
317 msrpc_gen(mem_ctx, &response, "ddbbdb",
318 0x00000101, /* Header */
320 long_date, 8, /* Timestamp */
321 client_chal, 8, /* client challenge */
323 names_blob->data, names_blob->length); /* End of name list */
328 static DATA_BLOB NTLMv2_generate_response(TALLOC_CTX *out_mem_ctx,
329 const uint8_t ntlm_v2_hash[16],
330 const DATA_BLOB *server_chal,
331 const DATA_BLOB *names_blob)
333 uint8_t ntlmv2_response[16];
334 DATA_BLOB ntlmv2_client_data;
335 DATA_BLOB final_response;
337 TALLOC_CTX *mem_ctx = talloc_named(out_mem_ctx, 0,
338 "NTLMv2_generate_response internal context");
341 return data_blob(NULL, 0);
345 /* generate some data to pass into the response function - including
346 the hostname and domain name of the server */
347 ntlmv2_client_data = NTLMv2_generate_client_data(mem_ctx, names_blob);
349 /* Given that data, and the challenge from the server, generate a response */
350 SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &ntlmv2_client_data, ntlmv2_response);
352 final_response = data_blob_talloc(out_mem_ctx, NULL, sizeof(ntlmv2_response) + ntlmv2_client_data.length);
354 memcpy(final_response.data, ntlmv2_response, sizeof(ntlmv2_response));
356 memcpy(final_response.data+sizeof(ntlmv2_response),
357 ntlmv2_client_data.data, ntlmv2_client_data.length);
359 talloc_free(mem_ctx);
361 return final_response;
364 static DATA_BLOB LMv2_generate_response(TALLOC_CTX *mem_ctx,
365 const uint8_t ntlm_v2_hash[16],
366 const DATA_BLOB *server_chal)
368 uint8_t lmv2_response[16];
369 DATA_BLOB lmv2_client_data = data_blob_talloc(mem_ctx, NULL, 8);
370 DATA_BLOB final_response = data_blob_talloc(mem_ctx, NULL,24);
373 /* client-supplied random data */
374 generate_random_buffer(lmv2_client_data.data, lmv2_client_data.length);
376 /* Given that data, and the challenge from the server, generate a response */
377 SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &lmv2_client_data, lmv2_response);
378 memcpy(final_response.data, lmv2_response, sizeof(lmv2_response));
380 /* after the first 16 bytes is the random data we generated above,
381 so the server can verify us with it */
382 memcpy(final_response.data+sizeof(lmv2_response),
383 lmv2_client_data.data, lmv2_client_data.length);
385 data_blob_free(&lmv2_client_data);
387 return final_response;
390 BOOL SMBNTLMv2encrypt_hash(TALLOC_CTX *mem_ctx,
391 const char *user, const char *domain, const uint8_t nt_hash[16],
392 const DATA_BLOB *server_chal,
393 const DATA_BLOB *names_blob,
394 DATA_BLOB *lm_response, DATA_BLOB *nt_response,
395 DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key)
397 uint8_t ntlm_v2_hash[16];
399 /* We don't use the NT# directly. Instead we use it mashed up with
400 the username and domain.
401 This prevents username swapping during the auth exchange
403 if (!ntv2_owf_gen(nt_hash, user, domain, True, ntlm_v2_hash)) {
408 *nt_response = NTLMv2_generate_response(mem_ctx,
409 ntlm_v2_hash, server_chal,
411 if (user_session_key) {
412 *user_session_key = data_blob_talloc(mem_ctx, NULL, 16);
414 /* The NTLMv2 calculations also provide a session key, for signing etc later */
415 /* use only the first 16 bytes of nt_response for session key */
416 SMBsesskeygen_ntv2(ntlm_v2_hash, nt_response->data, user_session_key->data);
423 *lm_response = LMv2_generate_response(mem_ctx,
424 ntlm_v2_hash, server_chal);
425 if (lm_session_key) {
426 *lm_session_key = data_blob_talloc(mem_ctx, NULL, 16);
428 /* The NTLMv2 calculations also provide a session key, for signing etc later */
429 /* use only the first 16 bytes of lm_response for session key */
430 SMBsesskeygen_ntv2(ntlm_v2_hash, lm_response->data, lm_session_key->data);
437 BOOL SMBNTLMv2encrypt(TALLOC_CTX *mem_ctx,
438 const char *user, const char *domain,
439 const char *password,
440 const DATA_BLOB *server_chal,
441 const DATA_BLOB *names_blob,
442 DATA_BLOB *lm_response, DATA_BLOB *nt_response,
443 DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key)
446 E_md4hash(password, nt_hash);
448 return SMBNTLMv2encrypt_hash(mem_ctx,
449 user, domain, nt_hash, server_chal, names_blob,
450 lm_response, nt_response, lm_session_key, user_session_key);
453 /***********************************************************
454 encode a password buffer with a unicode password. The buffer
455 is filled with random data to make it harder to attack.
456 ************************************************************/
457 BOOL encode_pw_buffer(uint8_t buffer[516], const char *password, int string_flags)
462 new_pw_len = push_string(new_pw,
464 sizeof(new_pw), string_flags);
466 memcpy(&buffer[512 - new_pw_len], new_pw, new_pw_len);
468 generate_random_buffer(buffer, 512 - new_pw_len);
471 * The length of the new password is in the last 4 bytes of
474 SIVAL(buffer, 512, new_pw_len);
480 /***********************************************************
481 decode a password buffer
482 *new_pw_len is the length in bytes of the possibly mulitbyte
483 returned password including termination.
484 ************************************************************/
485 BOOL decode_pw_buffer(uint8_t in_buffer[516], char *new_pwrd,
486 int new_pwrd_size, uint32_t *new_pw_len,
492 Warning !!! : This function is called from some rpc call.
493 The password IN the buffer may be a UNICODE string.
494 The password IN new_pwrd is an ASCII string
495 If you reuse that code somewhere else check first.
498 /* The length of the new password is in the last 4 bytes of the data buffer. */
500 byte_len = IVAL(in_buffer, 512);
502 #ifdef DEBUG_PASSWORD
503 dump_data(100, in_buffer, 516);
506 /* Password cannot be longer than the size of the password buffer */
507 if ( (byte_len < 0) || (byte_len > 512)) {
511 /* decode into the return buffer. Buffer length supplied */
512 *new_pw_len = pull_string(new_pwrd, &in_buffer[512 - byte_len], new_pwrd_size,
513 byte_len, string_flags);
515 #ifdef DEBUG_PASSWORD
516 DEBUG(100,("decode_pw_buffer: new_pwrd: "));
517 dump_data(100, (const uint8_t *)new_pwrd, *new_pw_len);
518 DEBUG(100,("multibyte len:%d\n", *new_pw_len));
519 DEBUG(100,("original char len:%d\n", byte_len/2));