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s4:ntlmssp: split gensec_ntlmssp_seal_packet() and ntlmssp_seal_packet()
[Samba/ekacnet.git] / source4 / auth / ntlmssp / ntlmssp_sign.c
blob3b18976d3cbb0cd8472d1d134e3bf8444df6373c
1 /*
2 * Unix SMB/CIFS implementation.
3 * Version 3.0
4 * NTLMSSP Signing routines
5 * Copyright (C) Luke Kenneth Casson Leighton 1996-2001
6 * Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003-2005
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 3 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "auth/ntlmssp/ntlmssp.h"
24 #include "../libcli/auth/libcli_auth.h"
25 #include "../lib/crypto/crypto.h"
26 #include "auth/gensec/gensec.h"
27
28 #define CLI_SIGN "session key to client-to-server signing key magic constant"
29 #define CLI_SEAL "session key to client-to-server sealing key magic constant"
30 #define SRV_SIGN "session key to server-to-client signing key magic constant"
31 #define SRV_SEAL "session key to server-to-client sealing key magic constant"
32
33 /**
34 * Some notes on the NTLM2 code:
35 *
36 * NTLM2 is a AEAD system. This means that the data encrypted is not
37 * all the data that is signed. In DCE-RPC case, the headers of the
38 * DCE-RPC packets are also signed. This prevents some of the
39 * fun-and-games one might have by changing them.
40 *
41 */
42
43 static void calc_ntlmv2_key(TALLOC_CTX *mem_ctx,
44 DATA_BLOB *subkey,
45 DATA_BLOB session_key,
46 const char *constant)
47 {
48 struct MD5Context ctx3;
49 *subkey = data_blob_talloc(mem_ctx, NULL, 16);
50 MD5Init(&ctx3);
51 MD5Update(&ctx3, session_key.data, session_key.length);
52 MD5Update(&ctx3, (const uint8_t *)constant, strlen(constant)+1);
53 MD5Final(subkey->data, &ctx3);
54 }
55
56 enum ntlmssp_direction {
57 NTLMSSP_SEND,
58 NTLMSSP_RECEIVE
59 };
60
61 static NTSTATUS ntlmssp_make_packet_signature(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
62 TALLOC_CTX *sig_mem_ctx,
63 const uint8_t *data, size_t length,
64 const uint8_t *whole_pdu, size_t pdu_length,
65 enum ntlmssp_direction direction,
66 DATA_BLOB *sig, bool encrypt_sig)
67 {
68 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
69
70 HMACMD5Context ctx;
71 uint8_t digest[16];
72 uint8_t seq_num[4];
73
74 *sig = data_blob_talloc(sig_mem_ctx, NULL, NTLMSSP_SIG_SIZE);
75 if (!sig->data) {
76 return NT_STATUS_NO_MEMORY;
77 }
78
79 switch (direction) {
80 case NTLMSSP_SEND:
81 SIVAL(seq_num, 0, gensec_ntlmssp_state->crypt.ntlm2.send_seq_num);
82 gensec_ntlmssp_state->crypt.ntlm2.send_seq_num++;
83 hmac_md5_init_limK_to_64(gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.data,
84 gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.length, &ctx);
85 break;
86 case NTLMSSP_RECEIVE:
87 SIVAL(seq_num, 0, gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num);
88 gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num++;
89 hmac_md5_init_limK_to_64(gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
90 gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.length, &ctx);
91 break;
92 }
93 hmac_md5_update(seq_num, sizeof(seq_num), &ctx);
94 hmac_md5_update(whole_pdu, pdu_length, &ctx);
95 hmac_md5_final(digest, &ctx);
96
97 if (encrypt_sig && gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
98 switch (direction) {
99 case NTLMSSP_SEND:
100 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, digest, 8);
101 break;
102 case NTLMSSP_RECEIVE:
103 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state, digest, 8);
104 break;
105 }
106 }
107
108 SIVAL(sig->data, 0, NTLMSSP_SIGN_VERSION);
109 memcpy(sig->data + 4, digest, 8);
110 memcpy(sig->data + 12, seq_num, 4);
111
112 DEBUG(10, ("NTLM2: created signature over %llu bytes of input:\n", (unsigned long long)pdu_length));
113 dump_data(11, sig->data, sig->length);
114
115 } else {
116 uint32_t crc;
117 crc = crc32_calc_buffer(data, length);
118 if (!msrpc_gen(sig_mem_ctx,
119 sig, "dddd", NTLMSSP_SIGN_VERSION, 0, crc, gensec_ntlmssp_state->crypt.ntlm.seq_num)) {
120 return NT_STATUS_NO_MEMORY;
121 }
122 gensec_ntlmssp_state->crypt.ntlm.seq_num++;
123
124 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, sig->data+4, sig->length-4);
125
126 DEBUG(10, ("NTLM1: created signature over %llu bytes of input:\n", (unsigned long long)length));
127 dump_data(11, sig->data, sig->length);
128 }
129 return NT_STATUS_OK;
130 }
131
132 NTSTATUS ntlmssp_sign_packet(struct gensec_ntlmssp_state *ntlmssp_state,
133 TALLOC_CTX *sig_mem_ctx,
134 const uint8_t *data, size_t length,
135 const uint8_t *whole_pdu, size_t pdu_length,
136 DATA_BLOB *sig)
137 {
138 return ntlmssp_make_packet_signature(ntlmssp_state,
139 sig_mem_ctx,
140 data, length,
141 whole_pdu, pdu_length,
142 NTLMSSP_SEND, sig, true);
143 }
144
145 /**
146 * Check the signature of an incoming packet
147 *
148 */
149
150 NTSTATUS ntlmssp_check_packet(struct gensec_ntlmssp_state *ntlmssp_state,
151 TALLOC_CTX *sig_mem_ctx,
152 const uint8_t *data, size_t length,
153 const uint8_t *whole_pdu, size_t pdu_length,
154 const DATA_BLOB *sig)
155 {
156 DATA_BLOB local_sig;
157 NTSTATUS nt_status;
158
159 if (!ntlmssp_state->session_key.length) {
160 DEBUG(3, ("NO session key, cannot check packet signature\n"));
161 return NT_STATUS_NO_USER_SESSION_KEY;
162 }
163
164 nt_status = ntlmssp_make_packet_signature(ntlmssp_state, sig_mem_ctx,
165 data, length,
166 whole_pdu, pdu_length,
167 NTLMSSP_RECEIVE, &local_sig, true);
168
169 if (!NT_STATUS_IS_OK(nt_status)) {
170 DEBUG(0, ("NTLMSSP packet sig creation failed with %s\n", nt_errstr(nt_status)));
171 return nt_status;
172 }
173
174 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
175 if (local_sig.length != sig->length ||
176 memcmp(local_sig.data,
177 sig->data, sig->length) != 0) {
178
179 DEBUG(10, ("BAD SIG NTLM2: wanted signature over %llu bytes of input:\n", (unsigned long long)pdu_length));
180 dump_data(10, local_sig.data, local_sig.length);
181
182 DEBUG(10, ("BAD SIG: got signature over %llu bytes of input:\n", (unsigned long long)pdu_length));
183 dump_data(10, sig->data, sig->length);
184
185 data_blob_free(&local_sig);
186 return NT_STATUS_ACCESS_DENIED;
187 }
188 } else {
189 if (local_sig.length != sig->length ||
190 memcmp(local_sig.data + 8,
191 sig->data + 8, sig->length - 8) != 0) {
192 DEBUG(10, ("BAD SIG NTLM1: wanted signature of %llu bytes of input:\n", (unsigned long long)length));
193 dump_data(5, local_sig.data, local_sig.length);
194
195 DEBUG(10, ("BAD SIG: got signature of %llu bytes of input:\n", (unsigned long long)length));
196 dump_data(10, sig->data, sig->length);
197
198 data_blob_free(&local_sig);
199 return NT_STATUS_ACCESS_DENIED;
200 }
201 }
202 dump_data_pw("checked ntlmssp signature\n", sig->data, sig->length);
203
204 data_blob_free(&local_sig);
205 return NT_STATUS_OK;
206 }
207
208
209 /**
210 * Seal data with the NTLMSSP algorithm
211 *
212 */
213
214 NTSTATUS ntlmssp_seal_packet(struct gensec_ntlmssp_state *ntlmssp_state,
215 TALLOC_CTX *sig_mem_ctx,
216 uint8_t *data, size_t length,
217 const uint8_t *whole_pdu, size_t pdu_length,
218 DATA_BLOB *sig)
219 {
220 NTSTATUS nt_status;
221
222 if (!ntlmssp_state->session_key.length) {
223 DEBUG(3, ("NO session key, cannot seal packet\n"));
224 return NT_STATUS_NO_USER_SESSION_KEY;
225 }
226
227 DEBUG(10,("ntlmssp_seal_data: seal\n"));
228 dump_data_pw("ntlmssp clear data\n", data, length);
229 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
230 /* The order of these two operations matters - we must first seal the packet,
231 then seal the sequence number - this is because the send_seal_hash is not
232 constant, but is is rather updated with each iteration */
233 nt_status = ntlmssp_make_packet_signature(ntlmssp_state, sig_mem_ctx,
234 data, length,
235 whole_pdu, pdu_length,
236 NTLMSSP_SEND, sig, false);
237 arcfour_crypt_sbox(ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, data, length);
238 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
239 arcfour_crypt_sbox(ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, sig->data+4, 8);
240 }
241 } else {
242 uint32_t crc;
243 crc = crc32_calc_buffer(data, length);
244 if (!msrpc_gen(sig_mem_ctx,
245 sig, "dddd", NTLMSSP_SIGN_VERSION, 0,
246 crc, ntlmssp_state->crypt.ntlm.seq_num)) {
247 return NT_STATUS_NO_MEMORY;
248 }
249
250 /* The order of these two operations matters - we must
251 first seal the packet, then seal the sequence
252 number - this is because the ntlmssp_hash is not
253 constant, but is is rather updated with each
254 iteration */
255
256 arcfour_crypt_sbox(ntlmssp_state->crypt.ntlm.arcfour_state, data, length);
257 arcfour_crypt_sbox(ntlmssp_state->crypt.ntlm.arcfour_state, sig->data+4, sig->length-4);
258 /* increment counter on send */
259 ntlmssp_state->crypt.ntlm.seq_num++;
260 nt_status = NT_STATUS_OK;
261 }
262 dump_data_pw("ntlmssp signature\n", sig->data, sig->length);
263 dump_data_pw("ntlmssp sealed data\n", data, length);
264
265
266 return nt_status;
267 }
268
269 /**
270 * Unseal data with the NTLMSSP algorithm
271 *
272 */
273
274 /*
275 wrappers for the ntlmssp_*() functions
276 */
277 NTSTATUS gensec_ntlmssp_unseal_packet(struct gensec_security *gensec_security,
278 TALLOC_CTX *sig_mem_ctx,
279 uint8_t *data, size_t length,
280 const uint8_t *whole_pdu, size_t pdu_length,
281 const DATA_BLOB *sig)
282 {
283 NTSTATUS status;
284 struct gensec_ntlmssp_context *gensec_ntlmssp =
285 talloc_get_type_abort(gensec_security->private_data,
286 struct gensec_ntlmssp_context);
287 struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
288 if (!gensec_ntlmssp_state->session_key.length) {
289 DEBUG(3, ("NO session key, cannot unseal packet\n"));
290 return NT_STATUS_NO_USER_SESSION_KEY;
291 }
292
293 dump_data_pw("ntlmssp sealed data\n", data, length);
294 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
295 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state, data, length);
296 } else {
297 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, data, length);
298 }
299 dump_data_pw("ntlmssp clear data\n", data, length);
300 status = gensec_ntlmssp_check_packet(gensec_security, sig_mem_ctx, data, length, whole_pdu, pdu_length, sig);
301
302 if (!NT_STATUS_IS_OK(status)) {
303 DEBUG(1, ("NTLMSSP packet check for unseal failed due to invalid signature on %llu bytes of input:\n", (unsigned long long)length));
304 }
305 return status;
306 }
307
308 /**
309 Initialise the state for NTLMSSP signing.
310 */
311 /* TODO: make this non-public */
312 NTSTATUS ntlmssp_sign_init(struct gensec_ntlmssp_state *gensec_ntlmssp_state)
313 {
314 TALLOC_CTX *mem_ctx = talloc_new(gensec_ntlmssp_state);
315
316 if (!mem_ctx) {
317 return NT_STATUS_NO_MEMORY;
318 }
319
320 DEBUG(3, ("NTLMSSP Sign/Seal - Initialising with flags:\n"));
321 debug_ntlmssp_flags(gensec_ntlmssp_state->neg_flags);
322
323 if (gensec_ntlmssp_state->session_key.length < 8) {
324 talloc_free(mem_ctx);
325 DEBUG(3, ("NO session key, cannot intialise signing\n"));
326 return NT_STATUS_NO_USER_SESSION_KEY;
327 }
328
329 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
330 {
331 DATA_BLOB weak_session_key = gensec_ntlmssp_state->session_key;
332 const char *send_sign_const;
333 const char *send_seal_const;
334 const char *recv_sign_const;
335 const char *recv_seal_const;
336
337 DATA_BLOB send_seal_key;
338 DATA_BLOB recv_seal_key;
339
340 switch (gensec_ntlmssp_state->role) {
341 case NTLMSSP_CLIENT:
342 send_sign_const = CLI_SIGN;
343 send_seal_const = CLI_SEAL;
344 recv_sign_const = SRV_SIGN;
345 recv_seal_const = SRV_SEAL;
346 break;
347 case NTLMSSP_SERVER:
348 send_sign_const = SRV_SIGN;
349 send_seal_const = SRV_SEAL;
350 recv_sign_const = CLI_SIGN;
351 recv_seal_const = CLI_SEAL;
352 break;
353 default:
354 talloc_free(mem_ctx);
355 return NT_STATUS_INTERNAL_ERROR;
356 }
357
358 gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
359 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state);
360 gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
361 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state);
362
363 /**
364 Weaken NTLMSSP keys to cope with down-level
365 clients, servers and export restrictions.
366
367 We probably should have some parameters to control
368 this, once we get NTLM2 working.
369 */
370
371 /* Key weakening was not performed on the master key
372 * for NTLM2 (in ntlmssp_weaken_keys()), but must be
373 * done on the encryption subkeys only. That is why
374 * we don't have this code for the ntlmv1 case.
375 */
376
377 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_128) {
378
379 } else if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
380 weak_session_key.length = 7;
381 } else { /* forty bits */
382 weak_session_key.length = 5;
383 }
384 dump_data_pw("NTLMSSP weakend master key:\n",
385 weak_session_key.data,
386 weak_session_key.length);
387
388 /* SEND: sign key */
389 calc_ntlmv2_key(gensec_ntlmssp_state,
390 &gensec_ntlmssp_state->crypt.ntlm2.send_sign_key,
391 gensec_ntlmssp_state->session_key, send_sign_const);
392 dump_data_pw("NTLMSSP send sign key:\n",
393 gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.data,
394 gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.length);
395
396 /* SEND: seal ARCFOUR pad */
397 calc_ntlmv2_key(mem_ctx,
398 &send_seal_key,
399 weak_session_key, send_seal_const);
400 dump_data_pw("NTLMSSP send seal key:\n",
401 send_seal_key.data,
402 send_seal_key.length);
403 arcfour_init(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state,
404 &send_seal_key);
405 dump_data_pw("NTLMSSP send sesl hash:\n",
406 gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state->sbox,
407 sizeof(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state->sbox));
408
409 /* RECV: sign key */
410 calc_ntlmv2_key(gensec_ntlmssp_state,
411 &gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key,
412 gensec_ntlmssp_state->session_key, recv_sign_const);
413 dump_data_pw("NTLMSSP recv sign key:\n",
414 gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
415 gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.length);
416
417 /* RECV: seal ARCFOUR pad */
418 calc_ntlmv2_key(mem_ctx,
419 &recv_seal_key,
420 weak_session_key, recv_seal_const);
421 dump_data_pw("NTLMSSP recv seal key:\n",
422 recv_seal_key.data,
423 recv_seal_key.length);
424 arcfour_init(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state,
425 &recv_seal_key);
426 dump_data_pw("NTLMSSP receive seal hash:\n",
427 gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state->sbox,
428 sizeof(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state->sbox));
429
430 gensec_ntlmssp_state->crypt.ntlm2.send_seq_num = 0;
431 gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num = 0;
432
433 } else {
434 DATA_BLOB weak_session_key = ntlmssp_weakend_key(gensec_ntlmssp_state, mem_ctx);
435 DEBUG(5, ("NTLMSSP Sign/Seal - using NTLM1\n"));
436
437 gensec_ntlmssp_state->crypt.ntlm.arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
438 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm.arcfour_state);
439
440 arcfour_init(gensec_ntlmssp_state->crypt.ntlm.arcfour_state,
441 &weak_session_key);
442 dump_data_pw("NTLMSSP hash:\n", gensec_ntlmssp_state->crypt.ntlm.arcfour_state->sbox,
443 sizeof(gensec_ntlmssp_state->crypt.ntlm.arcfour_state->sbox));
444
445 gensec_ntlmssp_state->crypt.ntlm.seq_num = 0;
446 }
447
448 talloc_free(mem_ctx);
449 return NT_STATUS_OK;
450 }
451
452 NTSTATUS gensec_ntlmssp_sign_packet(struct gensec_security *gensec_security,
453 TALLOC_CTX *sig_mem_ctx,
454 const uint8_t *data, size_t length,
455 const uint8_t *whole_pdu, size_t pdu_length,
456 DATA_BLOB *sig)
457 {
458 struct gensec_ntlmssp_context *gensec_ntlmssp =
459 talloc_get_type_abort(gensec_security->private_data,
460 struct gensec_ntlmssp_context);
461 NTSTATUS nt_status;
462
463 nt_status = ntlmssp_sign_packet(gensec_ntlmssp->ntlmssp_state,
464 sig_mem_ctx,
465 data, length,
466 whole_pdu, pdu_length,
467 sig);
468
469 return nt_status;
470 }
471
472 NTSTATUS gensec_ntlmssp_check_packet(struct gensec_security *gensec_security,
473 TALLOC_CTX *sig_mem_ctx,
474 const uint8_t *data, size_t length,
475 const uint8_t *whole_pdu, size_t pdu_length,
476 const DATA_BLOB *sig)
477 {
478 struct gensec_ntlmssp_context *gensec_ntlmssp =
479 talloc_get_type_abort(gensec_security->private_data,
480 struct gensec_ntlmssp_context);
481 NTSTATUS nt_status;
482
483 nt_status = ntlmssp_check_packet(gensec_ntlmssp->ntlmssp_state,
484 sig_mem_ctx,
485 data, length,
486 whole_pdu, pdu_length,
487 sig);
488
489 return nt_status;
490 }
491
492 NTSTATUS gensec_ntlmssp_seal_packet(struct gensec_security *gensec_security,
493 TALLOC_CTX *sig_mem_ctx,
494 uint8_t *data, size_t length,
495 const uint8_t *whole_pdu, size_t pdu_length,
496 DATA_BLOB *sig)
497 {
498 struct gensec_ntlmssp_context *gensec_ntlmssp =
499 talloc_get_type_abort(gensec_security->private_data,
500 struct gensec_ntlmssp_context);
501 NTSTATUS nt_status;
502
503 nt_status = ntlmssp_seal_packet(gensec_ntlmssp->ntlmssp_state,
504 sig_mem_ctx,
505 data, length,
506 whole_pdu, pdu_length,
507 sig);
508
509 return nt_status;
510 }
511
512 size_t gensec_ntlmssp_sig_size(struct gensec_security *gensec_security, size_t data_size)
513 {
514 return NTLMSSP_SIG_SIZE;
515 }
516
517 NTSTATUS gensec_ntlmssp_wrap(struct gensec_security *gensec_security,
518 TALLOC_CTX *sig_mem_ctx,
519 const DATA_BLOB *in,
520 DATA_BLOB *out)
521 {
522 DATA_BLOB sig;
523 NTSTATUS nt_status;
524
525 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
526
527 *out = data_blob_talloc(sig_mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
528 if (!out->data) {
529 return NT_STATUS_NO_MEMORY;
530 }
531 memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
532
533 nt_status = gensec_ntlmssp_seal_packet(gensec_security, sig_mem_ctx,
534 out->data + NTLMSSP_SIG_SIZE,
535 out->length - NTLMSSP_SIG_SIZE,
536 out->data + NTLMSSP_SIG_SIZE,
537 out->length - NTLMSSP_SIG_SIZE,
538 &sig);
539
540 if (NT_STATUS_IS_OK(nt_status)) {
541 memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
542 }
543 return nt_status;
544
545 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
546
547 *out = data_blob_talloc(sig_mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
548 if (!out->data) {
549 return NT_STATUS_NO_MEMORY;
550 }
551 memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
552
553 nt_status = gensec_ntlmssp_sign_packet(gensec_security, sig_mem_ctx,
554 out->data + NTLMSSP_SIG_SIZE,
555 out->length - NTLMSSP_SIG_SIZE,
556 out->data + NTLMSSP_SIG_SIZE,
557 out->length - NTLMSSP_SIG_SIZE,
558 &sig);
559
560 if (NT_STATUS_IS_OK(nt_status)) {
561 memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
562 }
563 return nt_status;
564
565 } else {
566 *out = *in;
567 return NT_STATUS_OK;
568 }
569 }
570
571
572 NTSTATUS gensec_ntlmssp_unwrap(struct gensec_security *gensec_security,
573 TALLOC_CTX *sig_mem_ctx,
574 const DATA_BLOB *in,
575 DATA_BLOB *out)
576 {
577 struct gensec_ntlmssp_context *gensec_ntlmssp =
578 talloc_get_type_abort(gensec_security->private_data,
579 struct gensec_ntlmssp_context);
580 struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
581 DATA_BLOB sig;
582
583 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
584 if (in->length < NTLMSSP_SIG_SIZE) {
585 return NT_STATUS_INVALID_PARAMETER;
586 }
587 sig.data = in->data;
588 sig.length = NTLMSSP_SIG_SIZE;
589
590 *out = data_blob_talloc(sig_mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
591
592 return gensec_ntlmssp_unseal_packet(gensec_security, sig_mem_ctx,
593 out->data, out->length,
594 out->data, out->length,
595 &sig);
596
597 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
598 NTSTATUS status;
599 uint32_t ntlm_seqnum;
600 struct arcfour_state ntlm_state;
601 uint32_t ntlm2_seqnum_r;
602 uint8_t ntlm2_key_r[16];
603 struct arcfour_state ntlm2_state_r;
604
605 if (in->length < NTLMSSP_SIG_SIZE) {
606 return NT_STATUS_INVALID_PARAMETER;
607 }
608 sig.data = in->data;
609 sig.length = NTLMSSP_SIG_SIZE;
610 *out = data_blob_talloc(sig_mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
611
612 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
613 ntlm2_seqnum_r = gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num;
614 ntlm2_state_r = *gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state;
615 memcpy(ntlm2_key_r,
616 gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
617 16);
618 } else {
619 ntlm_seqnum = gensec_ntlmssp_state->crypt.ntlm.seq_num;
620 ntlm_state = *gensec_ntlmssp_state->crypt.ntlm.arcfour_state;
621 }
622
623 status = gensec_ntlmssp_check_packet(gensec_security, sig_mem_ctx,
624 out->data, out->length,
625 out->data, out->length,
626 &sig);
627 if (!NT_STATUS_IS_OK(status)) {
628 NTSTATUS check_status = status;
629 /*
630 * The Windows LDAP libraries seems to have a bug
631 * and always use sealing even if only signing was
632 * negotiated. So we need to fallback.
633 */
634
635 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
636 gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num = ntlm2_seqnum_r;
637 *gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state = ntlm2_state_r;
638 memcpy(gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
639 ntlm2_key_r, 16);
640 } else {
641 gensec_ntlmssp_state->crypt.ntlm.seq_num = ntlm_seqnum;
642 *gensec_ntlmssp_state->crypt.ntlm.arcfour_state = ntlm_state;
643 }
644
645 status = gensec_ntlmssp_unseal_packet(gensec_security,
646 sig_mem_ctx,
647 out->data,
648 out->length,
649 out->data,
650 out->length,
651 &sig);
652 if (NT_STATUS_IS_OK(status)) {
653 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
654 } else {
655 status = check_status;
656 }
657 }
658
659 if (!NT_STATUS_IS_OK(status)) {
660 DEBUG(1, ("NTLMSSP packet check for unwrap failed due to invalid signature\n"));
661 }
662 return status;
663 } else {
664 *out = *in;
665 return NT_STATUS_OK;
666 }
667 }
668