Line data Source code
1 : /*
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
9 :
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.
14 :
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.
19 :
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/>.
22 : */
23 :
24 : #include "includes.h"
25 : #include "system/time.h"
26 : #include "../libcli/auth/msrpc_parse.h"
27 : #include "../lib/crypto/crypto.h"
28 : #include "../libcli/auth/libcli_auth.h"
29 : #include "../librpc/gen_ndr/ndr_ntlmssp.h"
30 : #include "lib/util/bytearray.h"
31 :
32 : #include "lib/crypto/gnutls_helpers.h"
33 : #include <gnutls/gnutls.h>
34 : #include <gnutls/crypto.h>
35 :
36 2091 : int SMBencrypt_hash(const uint8_t lm_hash[16], const uint8_t *c8, uint8_t p24[24])
37 : {
38 2 : uint8_t p21[21];
39 2 : int rc;
40 :
41 2091 : memset(p21,'\0',21);
42 2091 : memcpy(p21, lm_hash, 16);
43 :
44 2091 : rc = SMBOWFencrypt(p21, c8, p24);
45 :
46 : #ifdef DEBUG_PASSWORD
47 2091 : DEBUG(100,("SMBencrypt_hash: lm#, challenge, response\n"));
48 2091 : dump_data(100, p21, 16);
49 2091 : dump_data(100, c8, 8);
50 2091 : dump_data(100, p24, 24);
51 : #endif
52 :
53 2091 : return rc;
54 : }
55 :
56 : /*
57 : This implements the X/Open SMB password encryption
58 : It takes a password ('unix' string), a 8 byte "crypt key"
59 : and puts 24 bytes of encrypted password into p24
60 :
61 : Returns False if password must have been truncated to create LM hash
62 : */
63 :
64 1414 : bool SMBencrypt(const char *passwd, const uint8_t *c8, uint8_t p24[24])
65 : {
66 0 : bool ret;
67 0 : uint8_t lm_hash[16];
68 0 : int rc;
69 :
70 1414 : ret = E_deshash(passwd, lm_hash);
71 1414 : rc = SMBencrypt_hash(lm_hash, c8, p24);
72 1414 : if (rc != 0) {
73 0 : ret = false;
74 : }
75 1414 : return ret;
76 : }
77 :
78 : /**
79 : * Creates the MD4 Hash of the users password in NT UNICODE.
80 : * @param passwd password in 'unix' charset.
81 : * @param p16 return password hashed with md4, caller allocated 16 byte buffer
82 : */
83 :
84 42646 : bool E_md4hash(const char *passwd, uint8_t p16[16])
85 : {
86 157 : size_t len;
87 157 : smb_ucs2_t *wpwd;
88 157 : bool ret;
89 :
90 42646 : ret = push_ucs2_talloc(NULL, &wpwd, passwd, &len);
91 42646 : if (!ret || len < 2) {
92 : /* We don't want to return fixed data, as most callers
93 : * don't check */
94 0 : mdfour(p16, (const uint8_t *)passwd, strlen(passwd));
95 0 : return false;
96 : }
97 :
98 42646 : len -= 2;
99 42646 : mdfour(p16, (const uint8_t *)wpwd, len);
100 :
101 42646 : talloc_free(wpwd);
102 42646 : return true;
103 : }
104 :
105 : /**
106 : * Creates the DES forward-only Hash of the users password in DOS ASCII charset
107 : * @param passwd password in 'unix' charset.
108 : * @param p16 return password hashed with DES, caller allocated 16 byte buffer
109 : * @return false if password was > 14 characters, and therefore may be incorrect, otherwise true
110 : * @note p16 is filled in regardless
111 : */
112 :
113 10224 : bool E_deshash(const char *passwd, uint8_t p16[16])
114 : {
115 14 : bool ret;
116 14 : int rc;
117 14 : uint8_t dospwd[14];
118 10224 : TALLOC_CTX *frame = talloc_stackframe();
119 :
120 14 : size_t converted_size;
121 :
122 14 : char *tmpbuf;
123 :
124 10224 : ZERO_STRUCT(dospwd);
125 :
126 10224 : tmpbuf = strupper_talloc(frame, passwd);
127 10224 : if (tmpbuf == NULL) {
128 : /* Too many callers don't check this result, we need to fill in the buffer with something */
129 0 : strlcpy((char *)dospwd, passwd ? passwd : "", sizeof(dospwd));
130 0 : E_P16(dospwd, p16);
131 0 : talloc_free(frame);
132 0 : return false;
133 : }
134 :
135 10224 : ZERO_STRUCT(dospwd);
136 :
137 10224 : ret = convert_string_error(CH_UNIX, CH_DOS, tmpbuf, strlen(tmpbuf), dospwd, sizeof(dospwd), &converted_size);
138 10224 : talloc_free(frame);
139 :
140 : /* Only the first 14 chars are considered, password need not
141 : * be null terminated. We do this in the error and success
142 : * case to avoid returning a fixed 'password' buffer, but
143 : * callers should not use it when E_deshash returns false */
144 :
145 10224 : rc = E_P16((const uint8_t *)dospwd, p16);
146 10224 : if (rc != 0) {
147 0 : ret = false;
148 : }
149 :
150 10224 : ZERO_STRUCT(dospwd);
151 :
152 10224 : return ret;
153 : }
154 :
155 : /**
156 : * Creates the MD4 and DES (LM) Hash of the users password.
157 : * MD4 is of the NT Unicode, DES is of the DOS UPPERCASE password.
158 : * @param passwd password in 'unix' charset.
159 : * @param nt_p16 return password hashed with md4, caller allocated 16 byte buffer
160 : * @param p16 return password hashed with des, caller allocated 16 byte buffer
161 : */
162 :
163 : /* Does both the NT and LM owfs of a user's password */
164 66 : void nt_lm_owf_gen(const char *pwd, uint8_t nt_p16[16], uint8_t p16[16])
165 : {
166 : /* Calculate the MD4 hash (NT compatible) of the password */
167 66 : memset(nt_p16, '\0', 16);
168 66 : E_md4hash(pwd, nt_p16);
169 :
170 : #ifdef DEBUG_PASSWORD
171 66 : DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n"));
172 66 : dump_data(120, (const uint8_t *)pwd, strlen(pwd));
173 66 : dump_data(100, nt_p16, 16);
174 : #endif
175 :
176 66 : E_deshash(pwd, (uint8_t *)p16);
177 :
178 : #ifdef DEBUG_PASSWORD
179 66 : DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
180 66 : dump_data(120, (const uint8_t *)pwd, strlen(pwd));
181 66 : dump_data(100, p16, 16);
182 : #endif
183 66 : }
184 :
185 : /* Does both the NTLMv2 owfs of a user's password */
186 93729 : bool ntv2_owf_gen(const uint8_t owf[16],
187 : const char *user_in, const char *domain_in,
188 : uint8_t kr_buf[16])
189 : {
190 1911 : smb_ucs2_t *user;
191 1911 : smb_ucs2_t *domain;
192 1911 : size_t user_byte_len;
193 1911 : size_t domain_byte_len;
194 93729 : gnutls_hmac_hd_t hmac_hnd = NULL;
195 1911 : int rc;
196 93729 : bool ok = false;
197 93729 : TALLOC_CTX *mem_ctx = talloc_init("ntv2_owf_gen for %s\\%s", domain_in, user_in);
198 :
199 93729 : if (!mem_ctx) {
200 0 : return false;
201 : }
202 :
203 93729 : if (!user_in) {
204 0 : user_in = "";
205 : }
206 :
207 93729 : if (!domain_in) {
208 1728 : domain_in = "";
209 : }
210 :
211 93729 : user_in = strupper_talloc(mem_ctx, user_in);
212 93729 : if (user_in == NULL) {
213 0 : talloc_free(mem_ctx);
214 0 : return false;
215 : }
216 :
217 93729 : ok = push_ucs2_talloc(mem_ctx, &user, user_in, &user_byte_len );
218 93729 : if (!ok) {
219 0 : DEBUG(0, ("push_uss2_talloc() for user failed)\n"));
220 0 : talloc_free(mem_ctx);
221 0 : return false;
222 : }
223 :
224 93729 : ok = push_ucs2_talloc(mem_ctx, &domain, domain_in, &domain_byte_len);
225 93729 : if (!ok) {
226 0 : DEBUG(0, ("push_ucs2_talloc() for domain failed\n"));
227 0 : talloc_free(mem_ctx);
228 0 : return false;
229 : }
230 :
231 93729 : SMB_ASSERT(user_byte_len >= 2);
232 93729 : SMB_ASSERT(domain_byte_len >= 2);
233 :
234 : /* We don't want null termination */
235 93729 : user_byte_len = user_byte_len - 2;
236 93729 : domain_byte_len = domain_byte_len - 2;
237 :
238 93729 : rc = gnutls_hmac_init(&hmac_hnd,
239 : GNUTLS_MAC_MD5,
240 : owf,
241 : 16);
242 93729 : if (rc < 0) {
243 0 : ok = false;
244 0 : goto out;
245 : }
246 :
247 93729 : rc = gnutls_hmac(hmac_hnd, user, user_byte_len);
248 93729 : if (rc < 0) {
249 0 : gnutls_hmac_deinit(hmac_hnd, NULL);
250 0 : ok = false;
251 0 : goto out;
252 : }
253 93729 : rc = gnutls_hmac(hmac_hnd, domain, domain_byte_len);
254 93729 : if (rc < 0) {
255 0 : gnutls_hmac_deinit(hmac_hnd, NULL);
256 0 : ok = false;
257 0 : goto out;
258 : }
259 :
260 93729 : gnutls_hmac_deinit(hmac_hnd, kr_buf);
261 :
262 : #ifdef DEBUG_PASSWORD
263 93729 : DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
264 93729 : dump_data(100, (uint8_t *)user, user_byte_len);
265 93729 : dump_data(100, (uint8_t *)domain, domain_byte_len);
266 93729 : dump_data(100, owf, 16);
267 93729 : dump_data(100, kr_buf, 16);
268 : #endif
269 :
270 93729 : ok = true;
271 93729 : out:
272 93729 : talloc_free(mem_ctx);
273 93729 : return ok;
274 : }
275 :
276 : /* Does the des encryption from the NT or LM MD4 hash. */
277 11990 : int SMBOWFencrypt(const uint8_t passwd[16], const uint8_t *c8, uint8_t p24[24])
278 : {
279 18 : uint8_t p21[21];
280 :
281 11990 : ZERO_STRUCT(p21);
282 :
283 11990 : memcpy(p21, passwd, 16);
284 11990 : return E_P24(p21, c8, p24);
285 : }
286 :
287 : /* Does the des encryption. */
288 :
289 3237 : int SMBNTencrypt_hash(const uint8_t nt_hash[16], const uint8_t *c8, uint8_t *p24)
290 : {
291 0 : uint8_t p21[21];
292 0 : int rc;
293 :
294 3237 : memset(p21,'\0',21);
295 3237 : memcpy(p21, nt_hash, 16);
296 3237 : rc = SMBOWFencrypt(p21, c8, p24);
297 :
298 : #ifdef DEBUG_PASSWORD
299 3237 : DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
300 3237 : dump_data(100, p21, 16);
301 3237 : dump_data(100, c8, 8);
302 3237 : dump_data(100, p24, 24);
303 : #endif
304 :
305 3237 : return rc;
306 : }
307 :
308 : /* Does the NT MD4 hash then des encryption. Plaintext version of the above. */
309 :
310 3237 : int SMBNTencrypt(const char *passwd, const uint8_t *c8, uint8_t *p24)
311 : {
312 0 : uint8_t nt_hash[16];
313 3237 : E_md4hash(passwd, nt_hash);
314 3237 : return SMBNTencrypt_hash(nt_hash, c8, p24);
315 : }
316 :
317 :
318 : /* Does the md5 encryption from the Key Response for NTLMv2. */
319 101174 : NTSTATUS SMBOWFencrypt_ntv2(const uint8_t kr[16],
320 : const DATA_BLOB *srv_chal,
321 : const DATA_BLOB *smbcli_chal,
322 : uint8_t resp_buf[16])
323 : {
324 101174 : gnutls_hmac_hd_t hmac_hnd = NULL;
325 2219 : NTSTATUS status;
326 2219 : int rc;
327 :
328 101174 : rc = gnutls_hmac_init(&hmac_hnd,
329 : GNUTLS_MAC_MD5,
330 : kr,
331 : 16);
332 101174 : if (rc < 0) {
333 0 : return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
334 : }
335 :
336 101174 : rc = gnutls_hmac(hmac_hnd, srv_chal->data, srv_chal->length);
337 101174 : if (rc < 0) {
338 0 : status = gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
339 0 : goto out;
340 : }
341 101174 : rc = gnutls_hmac(hmac_hnd, smbcli_chal->data, smbcli_chal->length);
342 101174 : if (rc < 0) {
343 0 : status = gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
344 0 : goto out;
345 : }
346 :
347 : #ifdef DEBUG_PASSWORD
348 101174 : DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, smbcli_chal, resp_buf\n"));
349 101174 : dump_data(100, srv_chal->data, srv_chal->length);
350 101174 : dump_data(100, smbcli_chal->data, smbcli_chal->length);
351 101174 : dump_data(100, resp_buf, 16);
352 : #endif
353 :
354 101174 : status = NT_STATUS_OK;
355 101174 : out:
356 101174 : gnutls_hmac_deinit(hmac_hnd, resp_buf);
357 101174 : return status;
358 : }
359 :
360 86231 : NTSTATUS SMBsesskeygen_ntv2(const uint8_t kr[16],
361 : const uint8_t *nt_resp,
362 : uint8_t sess_key[16])
363 : {
364 1896 : int rc;
365 :
366 : /* a very nice, 128 bit, variable session key */
367 86231 : rc = gnutls_hmac_fast(GNUTLS_MAC_MD5,
368 : kr,
369 : 16,
370 : nt_resp,
371 : 16,
372 : sess_key);
373 86231 : if (rc != 0) {
374 0 : return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
375 : }
376 :
377 : #ifdef DEBUG_PASSWORD
378 86231 : DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
379 86231 : dump_data(100, sess_key, 16);
380 : #endif
381 :
382 86231 : return NT_STATUS_OK;
383 : }
384 :
385 6355 : void SMBsesskeygen_ntv1(const uint8_t kr[16], uint8_t sess_key[16])
386 : {
387 : /* yes, this session key does not change - yes, this
388 : is a problem - but it is 128 bits */
389 :
390 6355 : mdfour((uint8_t *)sess_key, kr, 16);
391 :
392 : #ifdef DEBUG_PASSWORD
393 6355 : DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
394 6355 : dump_data(100, sess_key, 16);
395 : #endif
396 6355 : }
397 :
398 1 : NTSTATUS SMBsesskeygen_lm_sess_key(const uint8_t lm_hash[16],
399 : const uint8_t lm_resp[24], /* only uses 8 */
400 : uint8_t sess_key[16])
401 : {
402 : /* Calculate the LM session key (effective length 40 bits,
403 : but changes with each session) */
404 1 : uint8_t p24[24];
405 1 : uint8_t partial_lm_hash[14];
406 1 : int rc;
407 :
408 1 : memcpy(partial_lm_hash, lm_hash, 8);
409 1 : memset(partial_lm_hash + 8, 0xbd, 6);
410 :
411 1 : rc = des_crypt56_gnutls(p24, lm_resp, partial_lm_hash, SAMBA_GNUTLS_ENCRYPT);
412 1 : if (rc < 0) {
413 0 : return gnutls_error_to_ntstatus(rc, NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER);
414 : }
415 1 : rc = des_crypt56_gnutls(p24+8, lm_resp, partial_lm_hash + 7, SAMBA_GNUTLS_ENCRYPT);
416 1 : if (rc < 0) {
417 0 : return gnutls_error_to_ntstatus(rc, NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER);
418 : }
419 :
420 1 : memcpy(sess_key, p24, 16);
421 :
422 : #ifdef DEBUG_PASSWORD
423 1 : DEBUG(100, ("SMBsesskeygen_lm_sess_key: \n"));
424 1 : dump_data(100, sess_key, 16);
425 : #endif
426 :
427 1 : return NT_STATUS_OK;
428 : }
429 :
430 5979 : DATA_BLOB NTLMv2_generate_names_blob(TALLOC_CTX *mem_ctx,
431 : const char *hostname,
432 : const char *domain)
433 : {
434 5979 : DATA_BLOB names_blob = data_blob_talloc(mem_ctx, NULL, 0);
435 :
436 : /* Deliberately ignore return here.. */
437 5979 : if (hostname != NULL) {
438 5951 : (void)msrpc_gen(mem_ctx, &names_blob,
439 : "aaa",
440 : MsvAvNbDomainName, domain,
441 : MsvAvNbComputerName, hostname,
442 : MsvAvEOL, "");
443 : } else {
444 28 : (void)msrpc_gen(mem_ctx, &names_blob,
445 : "aa",
446 : MsvAvNbDomainName, domain,
447 : MsvAvEOL, "");
448 : }
449 5979 : return names_blob;
450 : }
451 :
452 41979 : static DATA_BLOB NTLMv2_generate_client_data(TALLOC_CTX *mem_ctx,
453 : NTTIME nttime,
454 : const DATA_BLOB *names_blob)
455 : {
456 492 : uint8_t client_chal[8];
457 41979 : DATA_BLOB response = data_blob(NULL, 0);
458 492 : uint8_t long_date[8];
459 :
460 41979 : generate_random_buffer(client_chal, sizeof(client_chal));
461 :
462 41979 : push_nttime(long_date, 0, nttime);
463 :
464 : /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
465 :
466 : /* Deliberately ignore return here.. */
467 41979 : (void)msrpc_gen(mem_ctx, &response, "ddbbdb",
468 : 0x00000101, /* Header */
469 : 0, /* 'Reserved' */
470 : long_date, 8, /* Timestamp */
471 : client_chal, 8, /* client challenge */
472 : 0, /* Unknown */
473 41979 : names_blob->data, names_blob->length); /* End of name list */
474 :
475 41979 : return response;
476 : }
477 :
478 41979 : static DATA_BLOB NTLMv2_generate_response(TALLOC_CTX *out_mem_ctx,
479 : const uint8_t ntlm_v2_hash[16],
480 : const DATA_BLOB *server_chal,
481 : NTTIME nttime,
482 : const DATA_BLOB *names_blob)
483 : {
484 492 : uint8_t ntlmv2_response[16];
485 492 : DATA_BLOB ntlmv2_client_data;
486 492 : DATA_BLOB final_response;
487 492 : NTSTATUS status;
488 :
489 41979 : TALLOC_CTX *mem_ctx = talloc_named(out_mem_ctx, 0,
490 : "NTLMv2_generate_response internal context");
491 :
492 41979 : if (!mem_ctx) {
493 0 : return data_blob(NULL, 0);
494 : }
495 :
496 : /* NTLMv2 */
497 : /* generate some data to pass into the response function - including
498 : the hostname and domain name of the server */
499 41979 : ntlmv2_client_data = NTLMv2_generate_client_data(mem_ctx, nttime, names_blob);
500 :
501 : /* Given that data, and the challenge from the server, generate a response */
502 41979 : status = SMBOWFencrypt_ntv2(ntlm_v2_hash,
503 : server_chal,
504 : &ntlmv2_client_data,
505 : ntlmv2_response);
506 41979 : if (!NT_STATUS_IS_OK(status)) {
507 0 : talloc_free(mem_ctx);
508 0 : return data_blob(NULL, 0);
509 : }
510 :
511 41979 : final_response = data_blob_talloc(out_mem_ctx, NULL, sizeof(ntlmv2_response) + ntlmv2_client_data.length);
512 :
513 41979 : memcpy(final_response.data, ntlmv2_response, sizeof(ntlmv2_response));
514 :
515 41979 : memcpy(final_response.data+sizeof(ntlmv2_response),
516 41979 : ntlmv2_client_data.data, ntlmv2_client_data.length);
517 :
518 41979 : talloc_free(mem_ctx);
519 :
520 41979 : return final_response;
521 : }
522 :
523 7445 : static DATA_BLOB LMv2_generate_response(TALLOC_CTX *mem_ctx,
524 : const uint8_t ntlm_v2_hash[16],
525 : const DATA_BLOB *server_chal)
526 : {
527 308 : uint8_t lmv2_response[16];
528 7445 : DATA_BLOB lmv2_client_data = data_blob_talloc(mem_ctx, NULL, 8);
529 7445 : DATA_BLOB final_response = data_blob_talloc(mem_ctx, NULL,24);
530 308 : NTSTATUS status;
531 :
532 : /* LMv2 */
533 : /* client-supplied random data */
534 7445 : generate_random_buffer(lmv2_client_data.data, lmv2_client_data.length);
535 :
536 : /* Given that data, and the challenge from the server, generate a response */
537 7445 : status = SMBOWFencrypt_ntv2(ntlm_v2_hash,
538 : server_chal,
539 : &lmv2_client_data,
540 : lmv2_response);
541 7445 : if (!NT_STATUS_IS_OK(status)) {
542 0 : data_blob_free(&lmv2_client_data);
543 0 : return data_blob(NULL, 0);
544 : }
545 7445 : memcpy(final_response.data, lmv2_response, sizeof(lmv2_response));
546 :
547 : /* after the first 16 bytes is the random data we generated above,
548 : so the server can verify us with it */
549 7445 : memcpy(final_response.data+sizeof(lmv2_response),
550 7445 : lmv2_client_data.data, lmv2_client_data.length);
551 :
552 7445 : data_blob_free(&lmv2_client_data);
553 :
554 7445 : return final_response;
555 : }
556 :
557 41979 : bool SMBNTLMv2encrypt_hash(TALLOC_CTX *mem_ctx,
558 : const char *user, const char *domain, const uint8_t nt_hash[16],
559 : const DATA_BLOB *server_chal,
560 : const NTTIME *server_timestamp,
561 : const DATA_BLOB *names_blob,
562 : DATA_BLOB *lm_response, DATA_BLOB *nt_response,
563 : DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key)
564 : {
565 492 : uint8_t ntlm_v2_hash[16];
566 492 : NTSTATUS status;
567 :
568 : /* We don't use the NT# directly. Instead we use it mashed up with
569 : the username and domain.
570 : This prevents username swapping during the auth exchange
571 : */
572 41979 : if (!ntv2_owf_gen(nt_hash, user, domain, ntlm_v2_hash)) {
573 0 : return false;
574 : }
575 :
576 41979 : if (nt_response) {
577 41979 : const NTTIME *nttime = server_timestamp;
578 41979 : NTTIME _now = 0;
579 :
580 41979 : if (nttime == NULL) {
581 7445 : struct timeval tv_now = timeval_current();
582 7445 : _now = timeval_to_nttime(&tv_now);
583 7445 : nttime = &_now;
584 : }
585 :
586 41979 : *nt_response = NTLMv2_generate_response(mem_ctx,
587 : ntlm_v2_hash,
588 : server_chal,
589 : *nttime,
590 : names_blob);
591 41979 : if (user_session_key) {
592 41856 : *user_session_key = data_blob_talloc(mem_ctx, NULL, 16);
593 :
594 : /* The NTLMv2 calculations also provide a session key, for signing etc later */
595 : /* use only the first 16 bytes of nt_response for session key */
596 42348 : status = SMBsesskeygen_ntv2(ntlm_v2_hash,
597 41856 : nt_response->data,
598 : user_session_key->data);
599 41856 : if (!NT_STATUS_IS_OK(status)) {
600 0 : return false;
601 : }
602 : }
603 : }
604 :
605 : /* LMv2 */
606 :
607 41979 : if (lm_response) {
608 41979 : if (server_timestamp != NULL) {
609 34534 : *lm_response = data_blob_talloc_zero(mem_ctx, 24);
610 : } else {
611 7445 : *lm_response = LMv2_generate_response(mem_ctx,
612 : ntlm_v2_hash,
613 : server_chal);
614 : }
615 41979 : if (lm_session_key) {
616 3266 : *lm_session_key = data_blob_talloc(mem_ctx, NULL, 16);
617 :
618 : /* The NTLMv2 calculations also provide a session key, for signing etc later */
619 : /* use only the first 16 bytes of lm_response for session key */
620 3266 : status = SMBsesskeygen_ntv2(ntlm_v2_hash,
621 3266 : lm_response->data,
622 : lm_session_key->data);
623 3266 : if (!NT_STATUS_IS_OK(status)) {
624 0 : return false;
625 : }
626 : }
627 : }
628 :
629 41487 : return true;
630 : }
631 :
632 3481 : bool SMBNTLMv2encrypt(TALLOC_CTX *mem_ctx,
633 : const char *user, const char *domain,
634 : const char *password,
635 : const DATA_BLOB *server_chal,
636 : const DATA_BLOB *names_blob,
637 : DATA_BLOB *lm_response, DATA_BLOB *nt_response,
638 : DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key)
639 : {
640 0 : uint8_t nt_hash[16];
641 3481 : E_md4hash(password, nt_hash);
642 :
643 3481 : return SMBNTLMv2encrypt_hash(mem_ctx,
644 : user, domain, nt_hash,
645 : server_chal, NULL, names_blob,
646 : lm_response, nt_response, lm_session_key, user_session_key);
647 : }
648 :
649 14419 : NTSTATUS NTLMv2_RESPONSE_verify_netlogon_creds(const char *account_name,
650 : const char *account_domain,
651 : const DATA_BLOB response,
652 : const struct netlogon_creds_CredentialState *creds,
653 : const char *workgroup)
654 : {
655 14419 : TALLOC_CTX *frame = NULL;
656 : /* RespType + HiRespType */
657 1274 : static const char *magic = "\x01\x01";
658 1274 : int cmp;
659 1274 : struct NTLMv2_RESPONSE v2_resp;
660 1274 : enum ndr_err_code err;
661 14419 : const struct AV_PAIR *av_nb_cn = NULL;
662 14419 : const struct AV_PAIR *av_nb_dn = NULL;
663 :
664 14419 : if (response.length < 48) {
665 : /*
666 : * NTLMv2_RESPONSE has at least 48 bytes.
667 : */
668 4283 : return NT_STATUS_OK;
669 : }
670 :
671 10136 : cmp = memcmp(response.data + 16, magic, 2);
672 10136 : if (cmp != 0) {
673 : /*
674 : * It doesn't look like a valid NTLMv2_RESPONSE
675 : */
676 432 : return NT_STATUS_OK;
677 : }
678 :
679 9704 : if (response.length == 95) {
680 : /*
681 : * ndr_pull_NTLMv2_RESPONSE() fails on this strange blob,
682 : * because the AvPairs content is not valid
683 : * as AvLen of the first pair is 33032 (0x8108).
684 : *
685 : * I saw a single machine sending the following 3 times
686 : * in a row, but I'm not sure if everything is static.
687 : *
688 : * Note this is NTLMv2_CLIENT_CHALLENGE only, not
689 : * the full NTLMv2_RESPONSE (which has Response of 16 bytes
690 : * before the NTLMv2_CLIENT_CHALLENGE).
691 : *
692 : * Note this code only prevents
693 : * ndr_pull_error(Buffer Size Error): Pull bytes 39016
694 : * debug message for a known case, the actual
695 : * bug is also handled below in a generic way to
696 : * map NT_STATUS_BUFFER_TOO_SMALL to NT_STATUS_OK.
697 : *
698 : * See https://bugzilla.samba.org/show_bug.cgi?id=14932
699 : */
700 120 : static const char *netapp_magic =
701 : "\x01\x01\x00\x00\x00\x00\x00\x00"
702 : "\x3f\x3f\x3f\x3f\x3f\x3f\x3f\x3f"
703 : "\xb8\x82\x3a\xf1\xb3\xdd\x08\x15"
704 : "\x00\x00\x00\x00\x11\xa2\x08\x81"
705 : "\x50\x38\x22\x78\x2b\x94\x47\xfe"
706 : "\x54\x94\x7b\xff\x17\x27\x5a\xb4"
707 : "\xf4\x18\xba\xdc\x2c\x38\xfd\x5b"
708 : "\xfb\x0e\xc1\x85\x1e\xcc\x92\xbb"
709 : "\x9b\xb1\xc4\xd5\x53\x14\xff\x8c"
710 : "\x76\x49\xf5\x45\x90\x19\xa2";
711 : /*
712 : * First we check the initial bytes
713 : * and the 0x3F timestamp.
714 : */
715 654 : cmp = memcmp(response.data + 16,
716 : netapp_magic,
717 : 16);
718 654 : if (cmp == 0) {
719 : /*
720 : * Then check everything after the
721 : * client challenge
722 : */
723 654 : cmp = memcmp(response.data + 40,
724 654 : netapp_magic + 24,
725 534 : response.length - 40);
726 654 : if (cmp == 0) {
727 654 : DBG_DEBUG("Invalid NETAPP NTLMv2_RESPONSE "
728 : "for user[%s\\%s] against "
729 : "SEC_CHAN(%u)[%s/%s] "
730 : "in workgroup[%s]\n",
731 : account_domain,
732 : account_name,
733 : creds->secure_channel_type,
734 : creds->computer_name,
735 : creds->account_name,
736 : workgroup);
737 654 : return NT_STATUS_OK;
738 : }
739 : }
740 : }
741 :
742 9050 : frame = talloc_stackframe();
743 :
744 9050 : err = ndr_pull_struct_blob(&response, frame, &v2_resp,
745 : (ndr_pull_flags_fn_t)ndr_pull_NTLMv2_RESPONSE);
746 9050 : if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
747 0 : NTSTATUS status;
748 0 : status = ndr_map_error2ntstatus(err);
749 0 : if (NT_STATUS_EQUAL(status, NT_STATUS_BUFFER_TOO_SMALL)) {
750 : /*
751 : * We are supposed to ignore invalid buffers,
752 : * see https://bugzilla.samba.org/show_bug.cgi?id=14932
753 : */
754 0 : status = NT_STATUS_OK;
755 : }
756 0 : DEBUG(2,("%s: Failed to parse NTLMv2_RESPONSE length=%u "
757 : "for user[%s\\%s] against SEC_CHAN(%u)[%s/%s] "
758 : "in workgroup[%s] - %s %s %s\n",
759 : __func__,
760 : (unsigned)response.length,
761 : account_domain,
762 : account_name,
763 : creds->secure_channel_type,
764 : creds->computer_name,
765 : creds->account_name,
766 : workgroup,
767 : ndr_map_error2string(err),
768 : NT_STATUS_IS_OK(status) ? "(ignoring) =>" : "=>",
769 : nt_errstr(status)));
770 0 : dump_data(2, response.data, response.length);
771 0 : TALLOC_FREE(frame);
772 0 : return status;
773 : }
774 :
775 9050 : if (DEBUGLVL(10)) {
776 0 : NDR_PRINT_DEBUG(NTLMv2_RESPONSE, &v2_resp);
777 : }
778 :
779 : /*
780 : * Make sure the netbios computer name in the
781 : * NTLMv2_RESPONSE matches the computer name
782 : * in the secure channel credentials for workstation
783 : * trusts.
784 : *
785 : * And the netbios domain name matches our
786 : * workgroup.
787 : *
788 : * This prevents workstations from requesting
789 : * the session key of NTLMSSP sessions of clients
790 : * to other hosts.
791 : */
792 9050 : if (creds->secure_channel_type == SEC_CHAN_WKSTA) {
793 5203 : av_nb_cn = ndr_ntlmssp_find_av(&v2_resp.Challenge.AvPairs,
794 : MsvAvNbComputerName);
795 5203 : av_nb_dn = ndr_ntlmssp_find_av(&v2_resp.Challenge.AvPairs,
796 : MsvAvNbDomainName);
797 : }
798 :
799 8480 : if (av_nb_cn != NULL) {
800 5203 : const char *v = NULL;
801 5203 : char *a = NULL;
802 584 : size_t len;
803 :
804 5203 : v = av_nb_cn->Value.AvNbComputerName;
805 :
806 5203 : a = talloc_strdup(frame, creds->account_name);
807 5203 : if (a == NULL) {
808 0 : TALLOC_FREE(frame);
809 0 : return NT_STATUS_NO_MEMORY;
810 : }
811 5203 : len = strlen(a);
812 5203 : if (len > 0 && a[len - 1] == '$') {
813 5203 : a[len - 1] = '\0';
814 : }
815 :
816 5203 : cmp = strcasecmp_m(a, v);
817 5203 : if (cmp != 0) {
818 0 : DEBUG(2,("%s: NTLMv2_RESPONSE with "
819 : "NbComputerName[%s] rejected "
820 : "for user[%s\\%s] "
821 : "against SEC_CHAN_WKSTA[%s/%s] "
822 : "in workgroup[%s]\n",
823 : __func__, v,
824 : account_domain,
825 : account_name,
826 : creds->computer_name,
827 : creds->account_name,
828 : workgroup));
829 0 : TALLOC_FREE(frame);
830 0 : return NT_STATUS_LOGON_FAILURE;
831 : }
832 : }
833 9050 : if (av_nb_dn != NULL) {
834 5203 : const char *v = NULL;
835 :
836 5203 : v = av_nb_dn->Value.AvNbDomainName;
837 :
838 5203 : cmp = strcasecmp_m(workgroup, v);
839 5203 : if (cmp != 0) {
840 0 : DEBUG(2,("%s: NTLMv2_RESPONSE with "
841 : "NbDomainName[%s] rejected "
842 : "for user[%s\\%s] "
843 : "against SEC_CHAN_WKSTA[%s/%s] "
844 : "in workgroup[%s]\n",
845 : __func__, v,
846 : account_domain,
847 : account_name,
848 : creds->computer_name,
849 : creds->account_name,
850 : workgroup));
851 0 : TALLOC_FREE(frame);
852 0 : return NT_STATUS_LOGON_FAILURE;
853 : }
854 : }
855 :
856 9050 : TALLOC_FREE(frame);
857 9050 : return NT_STATUS_OK;
858 : }
859 :
860 : enum encode_order {
861 : ENCODE_ORDER_PASSWORD_FIRST,
862 : ENCODE_ORDER_PASSWORD_LAST,
863 : };
864 :
865 : #define PASSWORD_BUFFER_LEN 512
866 :
867 4086 : static ssize_t _encode_pwd_buffer_from_str(uint8_t buf[PASSWORD_BUFFER_LEN],
868 : const char *password,
869 : int string_flags,
870 : enum encode_order order)
871 : {
872 94 : ssize_t new_pw_len;
873 4086 : size_t pw_pos = 0;
874 4086 : size_t random_pos = 0;
875 4086 : size_t random_len = 0;
876 :
877 : /* The incoming buffer can be any alignment. */
878 4086 : string_flags |= STR_NOALIGN;
879 :
880 4086 : new_pw_len = push_string(buf,
881 : password,
882 : PASSWORD_BUFFER_LEN,
883 : string_flags);
884 4086 : if (new_pw_len < 0) {
885 0 : BURN_DATA_SIZE(buf, PASSWORD_BUFFER_LEN);
886 0 : return -1;
887 : }
888 :
889 4086 : if (new_pw_len == PASSWORD_BUFFER_LEN) {
890 0 : return new_pw_len;
891 : }
892 :
893 4086 : switch (order) {
894 201 : case ENCODE_ORDER_PASSWORD_FIRST:
895 201 : pw_pos = 0;
896 201 : random_pos = new_pw_len;
897 201 : random_len = PASSWORD_BUFFER_LEN - random_pos;
898 201 : break;
899 3885 : case ENCODE_ORDER_PASSWORD_LAST:
900 3885 : pw_pos = PASSWORD_BUFFER_LEN - new_pw_len;
901 3885 : random_pos = 0;
902 3885 : random_len = pw_pos;
903 3885 : memmove(buf + pw_pos, buf, new_pw_len);
904 3792 : break;
905 : }
906 :
907 4086 : generate_random_buffer(buf + random_pos, random_len);
908 :
909 4086 : return new_pw_len;
910 : }
911 :
912 : /***********************************************************
913 : encode a password buffer with a unicode password. The buffer
914 : is filled with random data to make it harder to attack.
915 : ************************************************************/
916 3885 : bool encode_pw_buffer(uint8_t buffer[516], const char *password, int string_flags)
917 : {
918 93 : ssize_t pw_len;
919 :
920 3885 : pw_len = _encode_pwd_buffer_from_str(buffer,
921 : password,
922 : string_flags,
923 : ENCODE_ORDER_PASSWORD_LAST);
924 3885 : if (pw_len < 0 || pw_len > PASSWORD_BUFFER_LEN) {
925 0 : return false;
926 : }
927 :
928 3885 : PUSH_LE_U32(buffer, PASSWORD_BUFFER_LEN, pw_len);
929 :
930 3885 : return true;
931 : }
932 :
933 :
934 : /***********************************************************
935 : decode a password buffer
936 : *new_pw_len is the length in bytes of the possibly mulitbyte
937 : returned password including termination.
938 : ************************************************************/
939 :
940 73 : bool decode_pw_buffer(TALLOC_CTX *ctx,
941 : uint8_t in_buffer[516],
942 : char **pp_new_pwrd,
943 : size_t *new_pw_len,
944 : charset_t string_charset)
945 : {
946 5 : DATA_BLOB new_password;
947 73 : int byte_len=0;
948 5 : bool ok;
949 :
950 73 : *pp_new_pwrd = NULL;
951 73 : *new_pw_len = 0;
952 :
953 73 : ok = extract_pw_from_buffer(ctx, in_buffer, &new_password);
954 73 : if (!ok) {
955 0 : return false;
956 : }
957 :
958 : /*
959 : Warning !!! : This function is called from some rpc call.
960 : The password IN the buffer may be a UNICODE string.
961 : The password IN new_pwrd is an ASCII string
962 : If you reuse that code somewhere else check first.
963 : */
964 :
965 : /* decode into the return buffer. */
966 78 : ok = convert_string_talloc(ctx,
967 : string_charset,
968 : CH_UNIX,
969 73 : new_password.data,
970 : new_password.length,
971 : pp_new_pwrd,
972 : new_pw_len);
973 73 : data_blob_free(&new_password);
974 73 : if (!ok) {
975 0 : DBG_ERR("Failed to convert incoming password\n");
976 0 : return false;
977 : }
978 73 : talloc_keep_secret(*pp_new_pwrd);
979 :
980 : #ifdef DEBUG_PASSWORD
981 73 : DEBUG(100,("decode_pw_buffer: new_pwrd: "));
982 73 : dump_data(100, (uint8_t *)*pp_new_pwrd, *new_pw_len);
983 73 : DEBUG(100,("multibyte len:%lu\n", (unsigned long int)*new_pw_len));
984 73 : DEBUG(100,("original char len:%d\n", byte_len/2));
985 : #endif
986 :
987 68 : return true;
988 : }
989 :
990 : #define MAX_PASSWORD_LEN 256
991 :
992 : /*
993 : * [MS-SAMR] 2.2.6.32 This creates the buffer to be sent. It is of type
994 : * SAMPR_USER_PASSWORD_AES.
995 : */
996 201 : bool encode_pwd_buffer514_from_str(uint8_t buffer[514],
997 : const char *password,
998 : uint32_t string_flags)
999 : {
1000 1 : ssize_t pw_len;
1001 :
1002 201 : pw_len = _encode_pwd_buffer_from_str(buffer + 2,
1003 : password,
1004 : string_flags,
1005 : ENCODE_ORDER_PASSWORD_FIRST);
1006 201 : if (pw_len < 0) {
1007 0 : return false;
1008 : }
1009 :
1010 201 : PUSH_LE_U16(buffer, 0, pw_len);
1011 :
1012 201 : return true;
1013 : }
1014 :
1015 136 : bool extract_pwd_blob_from_buffer514(TALLOC_CTX *mem_ctx,
1016 : const uint8_t in_buffer[514],
1017 : DATA_BLOB *new_password)
1018 : {
1019 : #ifdef DEBUG_PASSWORD
1020 136 : DEBUG(100, ("in_buffer: "));
1021 136 : dump_data(100, in_buffer, 514);
1022 : #endif
1023 :
1024 136 : new_password->length = PULL_LE_U16(in_buffer, 0);
1025 136 : if (new_password->length == 0 || new_password->length > 512) {
1026 0 : return false;
1027 : }
1028 :
1029 138 : new_password->data =
1030 136 : talloc_memdup(mem_ctx, in_buffer + 2, new_password->length);
1031 136 : if (new_password->data == NULL) {
1032 0 : return false;
1033 : }
1034 136 : talloc_keep_secret(new_password->data);
1035 :
1036 : #ifdef DEBUG_PASSWORD
1037 136 : DEBUG(100, ("new_pwd_len: %zu\n", new_password->length));
1038 136 : DEBUG(100, ("new_pwd: "));
1039 136 : dump_data(100, new_password->data, new_password->length);
1040 : #endif
1041 :
1042 136 : return true;
1043 : }
1044 :
1045 5 : bool decode_pwd_string_from_buffer514(TALLOC_CTX *mem_ctx,
1046 : const uint8_t in_buffer[514],
1047 : charset_t string_charset,
1048 : DATA_BLOB *decoded_password)
1049 : {
1050 5 : DATA_BLOB new_password = {
1051 : .length = 0,
1052 : };
1053 1 : bool ok;
1054 :
1055 5 : ok = extract_pwd_blob_from_buffer514(mem_ctx, in_buffer, &new_password);
1056 5 : if (!ok) {
1057 0 : return false;
1058 : }
1059 :
1060 6 : ok = convert_string_talloc(mem_ctx,
1061 : string_charset,
1062 : CH_UNIX,
1063 5 : new_password.data,
1064 : new_password.length,
1065 5 : &decoded_password->data,
1066 : &decoded_password->length);
1067 5 : data_blob_free(&new_password);
1068 5 : if (!ok) {
1069 0 : return false;
1070 : }
1071 5 : talloc_keep_secret(decoded_password->data);
1072 :
1073 5 : return true;
1074 : }
1075 :
1076 : /***********************************************************
1077 : Encode an arc4 password change buffer.
1078 : ************************************************************/
1079 769 : NTSTATUS encode_rc4_passwd_buffer(const char *passwd,
1080 : const DATA_BLOB *session_key,
1081 : struct samr_CryptPasswordEx *out_crypt_pwd)
1082 : {
1083 769 : uint8_t _confounder[16] = {0};
1084 769 : DATA_BLOB confounder = data_blob_const(_confounder, 16);
1085 769 : DATA_BLOB pw_data = data_blob_const(out_crypt_pwd->data, 516);
1086 74 : bool ok;
1087 74 : int rc;
1088 :
1089 769 : ok = encode_pw_buffer(pw_data.data, passwd, STR_UNICODE);
1090 769 : if (!ok) {
1091 0 : return NT_STATUS_INVALID_PARAMETER;
1092 : }
1093 :
1094 769 : generate_random_buffer(confounder.data, confounder.length);
1095 :
1096 769 : rc = samba_gnutls_arcfour_confounded_md5(&confounder,
1097 : session_key,
1098 : &pw_data,
1099 : SAMBA_GNUTLS_ENCRYPT);
1100 769 : if (rc < 0) {
1101 0 : ZERO_ARRAY(_confounder);
1102 0 : data_blob_clear(&pw_data);
1103 0 : return gnutls_error_to_ntstatus(rc, NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER);
1104 : }
1105 :
1106 : /*
1107 : * The packet format is the 516 byte RC4 encrypted
1108 : * password followed by the 16 byte counfounder
1109 : * The confounder is a salt to prevent pre-computed hash attacks on the
1110 : * database.
1111 : */
1112 769 : memcpy(&out_crypt_pwd->data[516], confounder.data, confounder.length);
1113 769 : ZERO_ARRAY(_confounder);
1114 :
1115 769 : return NT_STATUS_OK;
1116 : }
1117 :
1118 : /***********************************************************
1119 : Decode an arc4 encrypted password change buffer.
1120 : ************************************************************/
1121 :
1122 51 : NTSTATUS decode_rc4_passwd_buffer(const DATA_BLOB *psession_key,
1123 : struct samr_CryptPasswordEx *inout_crypt_pwd)
1124 : {
1125 : /* Confounder is last 16 bytes. */
1126 51 : DATA_BLOB confounder = data_blob_const(&inout_crypt_pwd->data[516], 16);
1127 51 : DATA_BLOB pw_data = data_blob_const(&inout_crypt_pwd->data, 516);
1128 3 : int rc;
1129 :
1130 51 : rc = samba_gnutls_arcfour_confounded_md5(&confounder,
1131 : psession_key,
1132 : &pw_data,
1133 : SAMBA_GNUTLS_DECRYPT);
1134 51 : if (rc < 0) {
1135 0 : return gnutls_error_to_ntstatus(rc, NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER);
1136 : }
1137 :
1138 51 : return NT_STATUS_OK;
1139 : }
1140 :
1141 : /***********************************************************
1142 : encode a password buffer with an already unicode password. The
1143 : rest of the buffer is filled with random data to make it harder to attack.
1144 : ************************************************************/
1145 :
1146 73 : static bool create_pw_buffer_from_blob(uint8_t buffer[512],
1147 : const DATA_BLOB *in_password,
1148 : enum encode_order order)
1149 : {
1150 73 : size_t pwd_pos = 0;
1151 73 : size_t random_pos = 0;
1152 73 : size_t random_len = 0;
1153 :
1154 73 : if (in_password->length > 512) {
1155 0 : return false;
1156 : }
1157 :
1158 73 : switch (order) {
1159 0 : case ENCODE_ORDER_PASSWORD_FIRST:
1160 0 : pwd_pos = 0;
1161 0 : random_pos = in_password->length;
1162 0 : break;
1163 73 : case ENCODE_ORDER_PASSWORD_LAST:
1164 73 : pwd_pos = PASSWORD_BUFFER_LEN - in_password->length;
1165 73 : random_pos = 0;
1166 73 : break;
1167 : }
1168 73 : random_len = PASSWORD_BUFFER_LEN - in_password->length;
1169 :
1170 73 : memcpy(buffer + pwd_pos, in_password->data, in_password->length);
1171 73 : generate_random_buffer(buffer + random_pos, random_len);
1172 :
1173 73 : return true;
1174 : }
1175 :
1176 73 : bool set_pw_in_buffer(uint8_t buffer[516], const DATA_BLOB *password)
1177 : {
1178 7 : bool ok;
1179 :
1180 73 : ok = create_pw_buffer_from_blob(buffer,
1181 : password,
1182 : ENCODE_ORDER_PASSWORD_LAST);
1183 73 : if (!ok) {
1184 0 : return false;
1185 : }
1186 :
1187 : /*
1188 : * The length of the new password is in the last 4 bytes of
1189 : * the data buffer.
1190 : */
1191 73 : PUSH_LE_U32(buffer, PASSWORD_BUFFER_LEN, password->length);
1192 :
1193 73 : return true;
1194 : }
1195 :
1196 : /***********************************************************
1197 : decode a password buffer
1198 : *new_pw_size is the length in bytes of the extracted unicode password
1199 : ************************************************************/
1200 2447 : bool extract_pw_from_buffer(TALLOC_CTX *mem_ctx,
1201 : uint8_t in_buffer[516], DATA_BLOB *new_pass)
1202 : {
1203 2447 : int byte_len=0;
1204 :
1205 : /* The length of the new password is in the last 4 bytes of the data buffer. */
1206 :
1207 2447 : byte_len = IVAL(in_buffer, 512);
1208 :
1209 : #ifdef DEBUG_PASSWORD
1210 2447 : dump_data(100, in_buffer, 516);
1211 : #endif
1212 :
1213 : /* Password cannot be longer than the size of the password buffer */
1214 2447 : if ( (byte_len < 0) || (byte_len > 512)) {
1215 453 : return false;
1216 : }
1217 :
1218 1994 : *new_pass = data_blob_talloc(mem_ctx, &in_buffer[512 - byte_len], byte_len);
1219 :
1220 1994 : if (!new_pass->data) {
1221 0 : return false;
1222 : }
1223 1994 : talloc_keep_secret(new_pass->data);
1224 :
1225 1994 : return true;
1226 : }
1227 :
1228 :
1229 : /* encode a wkssvc_PasswordBuffer:
1230 : *
1231 : * similar to samr_CryptPasswordEx. Different: 8byte confounder (instead of
1232 : * 16byte), confounder in front of the 516 byte buffer (instead of after that
1233 : * buffer), calling MD5Update() first with session_key and then with confounder
1234 : * (vice versa in samr) - Guenther */
1235 :
1236 1 : WERROR encode_wkssvc_join_password_buffer(TALLOC_CTX *mem_ctx,
1237 : const char *pwd,
1238 : DATA_BLOB *session_key,
1239 : struct wkssvc_PasswordBuffer **out_pwd_buf)
1240 : {
1241 1 : struct wkssvc_PasswordBuffer *pwd_buf = NULL;
1242 1 : uint8_t _confounder[8] = {0};
1243 1 : DATA_BLOB confounder = data_blob_const(_confounder, 8);
1244 1 : uint8_t pwbuf[516] = {0};
1245 1 : DATA_BLOB encrypt_pwbuf = data_blob_const(pwbuf, 516);
1246 1 : int rc;
1247 :
1248 1 : pwd_buf = talloc_zero(mem_ctx, struct wkssvc_PasswordBuffer);
1249 1 : if (pwd_buf == NULL) {
1250 0 : return WERR_NOT_ENOUGH_MEMORY;
1251 : }
1252 :
1253 1 : encode_pw_buffer(pwbuf, pwd, STR_UNICODE);
1254 :
1255 1 : generate_random_buffer(_confounder, sizeof(_confounder));
1256 :
1257 1 : rc = samba_gnutls_arcfour_confounded_md5(session_key,
1258 : &confounder,
1259 : &encrypt_pwbuf,
1260 : SAMBA_GNUTLS_ENCRYPT);
1261 1 : if (rc < 0) {
1262 0 : ZERO_ARRAY(_confounder);
1263 0 : TALLOC_FREE(pwd_buf);
1264 0 : return gnutls_error_to_werror(rc, WERR_CONTENT_BLOCKED);
1265 : }
1266 :
1267 1 : memcpy(&pwd_buf->data[0], confounder.data, confounder.length);
1268 1 : ZERO_ARRAY(_confounder);
1269 1 : memcpy(&pwd_buf->data[8], encrypt_pwbuf.data, encrypt_pwbuf.length);
1270 1 : ZERO_ARRAY(pwbuf);
1271 :
1272 1 : *out_pwd_buf = pwd_buf;
1273 :
1274 1 : return WERR_OK;
1275 : }
1276 :
1277 2 : WERROR decode_wkssvc_join_password_buffer(TALLOC_CTX *mem_ctx,
1278 : struct wkssvc_PasswordBuffer *pwd_buf,
1279 : DATA_BLOB *session_key,
1280 : char **pwd)
1281 : {
1282 2 : uint8_t _confounder[8] = { 0 };
1283 2 : DATA_BLOB confounder = data_blob_const(_confounder, 8);
1284 2 : uint8_t pwbuf[516] = {0};
1285 2 : DATA_BLOB decrypt_pwbuf = data_blob_const(pwbuf, 516);
1286 2 : bool ok;
1287 2 : int rc;
1288 :
1289 2 : if (pwd_buf == NULL) {
1290 0 : return WERR_INVALID_PASSWORD;
1291 : }
1292 :
1293 2 : *pwd = NULL;
1294 :
1295 2 : if (session_key->length != 16) {
1296 0 : DEBUG(10,("invalid session key\n"));
1297 0 : return WERR_INVALID_PASSWORD;
1298 : }
1299 :
1300 2 : confounder = data_blob_const(&pwd_buf->data[0], 8);
1301 2 : memcpy(&pwbuf, &pwd_buf->data[8], 516);
1302 :
1303 2 : rc = samba_gnutls_arcfour_confounded_md5(session_key,
1304 : &confounder,
1305 : &decrypt_pwbuf,
1306 : SAMBA_GNUTLS_ENCRYPT);
1307 2 : if (rc < 0) {
1308 0 : ZERO_ARRAY(_confounder);
1309 0 : TALLOC_FREE(pwd_buf);
1310 0 : return gnutls_error_to_werror(rc, WERR_CONTENT_BLOCKED);
1311 : }
1312 :
1313 2 : ok = decode_pw_buffer(mem_ctx,
1314 : decrypt_pwbuf.data,
1315 : pwd,
1316 : &decrypt_pwbuf.length,
1317 : CH_UTF16);
1318 2 : ZERO_ARRAY(pwbuf);
1319 :
1320 2 : if (!ok) {
1321 0 : return WERR_INVALID_PASSWORD;
1322 : }
1323 :
1324 2 : return WERR_OK;
1325 : }
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