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s3-ldap: Fix Bug #5879. Update LDAP schema for Netscape DS 5.
[Samba.git] / source4 / auth / ntlmssp / ntlmssp_sign.c
blob3a07d7e7bd48ec907074225cc448dc6102014bfd
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/auth.h"
24 #include "auth/ntlmssp/ntlmssp.h"
25 #include "auth/ntlmssp/msrpc_parse.h"
26 #include "../lib/crypto/crypto.h"
27 #include "auth/credentials/credentials.h"
28 #include "auth/gensec/gensec.h"
29
30 #define CLI_SIGN "session key to client-to-server signing key magic constant"
31 #define CLI_SEAL "session key to client-to-server sealing key magic constant"
32 #define SRV_SIGN "session key to server-to-client signing key magic constant"
33 #define SRV_SEAL "session key to server-to-client sealing key magic constant"
34
35 /**
36 * Some notes on the NTLM2 code:
37 *
38 * NTLM2 is a AEAD system. This means that the data encrypted is not
39 * all the data that is signed. In DCE-RPC case, the headers of the
40 * DCE-RPC packets are also signed. This prevents some of the
41 * fun-and-games one might have by changing them.
42 *
43 */
44
45 static void calc_ntlmv2_key(TALLOC_CTX *mem_ctx,
46 DATA_BLOB *subkey,
47 DATA_BLOB session_key,
48 const char *constant)
49 {
50 struct MD5Context ctx3;
51 *subkey = data_blob_talloc(mem_ctx, NULL, 16);
52 MD5Init(&ctx3);
53 MD5Update(&ctx3, session_key.data, session_key.length);
54 MD5Update(&ctx3, (const uint8_t *)constant, strlen(constant)+1);
55 MD5Final(subkey->data, &ctx3);
56 }
57
58 enum ntlmssp_direction {
59 NTLMSSP_SEND,
60 NTLMSSP_RECEIVE
61 };
62
63 static NTSTATUS ntlmssp_make_packet_signature(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
64 TALLOC_CTX *sig_mem_ctx,
65 const uint8_t *data, size_t length,
66 const uint8_t *whole_pdu, size_t pdu_length,
67 enum ntlmssp_direction direction,
68 DATA_BLOB *sig, bool encrypt_sig)
69 {
70 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
71
72 HMACMD5Context ctx;
73 uint8_t digest[16];
74 uint8_t seq_num[4];
75
76 *sig = data_blob_talloc(sig_mem_ctx, NULL, NTLMSSP_SIG_SIZE);
77 if (!sig->data) {
78 return NT_STATUS_NO_MEMORY;
79 }
80
81 switch (direction) {
82 case NTLMSSP_SEND:
83 SIVAL(seq_num, 0, gensec_ntlmssp_state->crypt.ntlm2.send_seq_num);
84 gensec_ntlmssp_state->crypt.ntlm2.send_seq_num++;
85 hmac_md5_init_limK_to_64(gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.data,
86 gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.length, &ctx);
87 break;
88 case NTLMSSP_RECEIVE:
89 SIVAL(seq_num, 0, gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num);
90 gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num++;
91 hmac_md5_init_limK_to_64(gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
92 gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.length, &ctx);
93 break;
94 }
95 hmac_md5_update(seq_num, sizeof(seq_num), &ctx);
96 hmac_md5_update(whole_pdu, pdu_length, &ctx);
97 hmac_md5_final(digest, &ctx);
98
99 if (encrypt_sig && gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
100 switch (direction) {
101 case NTLMSSP_SEND:
102 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, digest, 8);
103 break;
104 case NTLMSSP_RECEIVE:
105 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state, digest, 8);
106 break;
107 }
108 }
109
110 SIVAL(sig->data, 0, NTLMSSP_SIGN_VERSION);
111 memcpy(sig->data + 4, digest, 8);
112 memcpy(sig->data + 12, seq_num, 4);
113
114 DEBUG(10, ("NTLM2: created signature over %llu bytes of input:\n", (unsigned long long)pdu_length));
115 dump_data(11, sig->data, sig->length);
116
117 } else {
118 uint32_t crc;
119 crc = crc32_calc_buffer(data, length);
120 if (!msrpc_gen(sig_mem_ctx,
121 sig, "dddd", NTLMSSP_SIGN_VERSION, 0, crc, gensec_ntlmssp_state->crypt.ntlm.seq_num)) {
122 return NT_STATUS_NO_MEMORY;
123 }
124 gensec_ntlmssp_state->crypt.ntlm.seq_num++;
125
126 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, sig->data+4, sig->length-4);
127
128 DEBUG(10, ("NTLM1: created signature over %llu bytes of input:\n", (unsigned long long)length));
129 dump_data(11, sig->data, sig->length);
130 }
131 return NT_STATUS_OK;
132 }
133
134 /* TODO: make this non-public */
135 NTSTATUS gensec_ntlmssp_sign_packet(struct gensec_security *gensec_security,
136 TALLOC_CTX *sig_mem_ctx,
137 const uint8_t *data, size_t length,
138 const uint8_t *whole_pdu, size_t pdu_length,
139 DATA_BLOB *sig)
140 {
141 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
142
143 return ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
144 data, length,
145 whole_pdu, pdu_length,
146 NTLMSSP_SEND, sig, true);
147 }
148
149 /**
150 * Check the signature of an incoming packet
151 *
152 */
153
154 NTSTATUS gensec_ntlmssp_check_packet(struct gensec_security *gensec_security,
155 TALLOC_CTX *sig_mem_ctx,
156 const uint8_t *data, size_t length,
157 const uint8_t *whole_pdu, size_t pdu_length,
158 const DATA_BLOB *sig)
159 {
160 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
161
162 DATA_BLOB local_sig;
163 NTSTATUS nt_status;
164
165 if (!gensec_ntlmssp_state->session_key.length) {
166 DEBUG(3, ("NO session key, cannot check packet signature\n"));
167 return NT_STATUS_NO_USER_SESSION_KEY;
168 }
169
170 nt_status = ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
171 data, length,
172 whole_pdu, pdu_length,
173 NTLMSSP_RECEIVE, &local_sig, true);
174
175 if (!NT_STATUS_IS_OK(nt_status)) {
176 DEBUG(0, ("NTLMSSP packet check failed with %s\n", nt_errstr(nt_status)));
177 return nt_status;
178 }
179
180 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
181 if (local_sig.length != sig->length ||
182 memcmp(local_sig.data,
183 sig->data, sig->length) != 0) {
184 DEBUG(5, ("BAD SIG NTLM2: wanted signature over %llu bytes of input:\n", (unsigned long long)pdu_length));
185 dump_data(5, local_sig.data, local_sig.length);
186
187 DEBUG(5, ("BAD SIG: got signature over %llu bytes of input:\n", (unsigned long long)pdu_length));
188 dump_data(5, sig->data, sig->length);
189
190 DEBUG(1, ("NTLMSSP NTLM2 packet check failed due to invalid signature on %llu bytes of input!\n", (unsigned long long)pdu_length));
191 return NT_STATUS_ACCESS_DENIED;
192 }
193 } else {
194 if (local_sig.length != sig->length ||
195 memcmp(local_sig.data + 8,
196 sig->data + 8, sig->length - 8) != 0) {
197 DEBUG(5, ("BAD SIG NTLM1: wanted signature of %llu bytes of input:\n", (unsigned long long)length));
198 dump_data(5, local_sig.data, local_sig.length);
199
200 DEBUG(5, ("BAD SIG: got signature of %llu bytes of input:\n", (unsigned long long)length));
201 dump_data(5, sig->data, sig->length);
202
203 DEBUG(1, ("NTLMSSP NTLM1 packet check failed due to invalid signature on %llu bytes of input:\n", (unsigned long long)length));
204 return NT_STATUS_ACCESS_DENIED;
205 }
206 }
207 dump_data_pw("checked ntlmssp signature\n", sig->data, sig->length);
208
209 return NT_STATUS_OK;
210 }
211
212
213 /**
214 * Seal data with the NTLMSSP algorithm
215 *
216 */
217
218 NTSTATUS gensec_ntlmssp_seal_packet(struct gensec_security *gensec_security,
219 TALLOC_CTX *sig_mem_ctx,
220 uint8_t *data, size_t length,
221 const uint8_t *whole_pdu, size_t pdu_length,
222 DATA_BLOB *sig)
223 {
224 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
225 NTSTATUS nt_status;
226 if (!gensec_ntlmssp_state->session_key.length) {
227 DEBUG(3, ("NO session key, cannot seal packet\n"));
228 return NT_STATUS_NO_USER_SESSION_KEY;
229 }
230
231 DEBUG(10,("ntlmssp_seal_data: seal\n"));
232 dump_data_pw("ntlmssp clear data\n", data, length);
233 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
234 /* The order of these two operations matters - we must first seal the packet,
235 then seal the sequence number - this is becouse the send_seal_hash is not
236 constant, but is is rather updated with each iteration */
237 nt_status = ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
238 data, length,
239 whole_pdu, pdu_length,
240 NTLMSSP_SEND, sig, false);
241 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, data, length);
242 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
243 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, sig->data+4, 8);
244 }
245 } else {
246 uint32_t crc;
247 crc = crc32_calc_buffer(data, length);
248 if (!msrpc_gen(sig_mem_ctx,
249 sig, "dddd", NTLMSSP_SIGN_VERSION, 0, crc, gensec_ntlmssp_state->crypt.ntlm.seq_num)) {
250 return NT_STATUS_NO_MEMORY;
251 }
252
253 /* The order of these two operations matters - we must
254 first seal the packet, then seal the sequence
255 number - this is becouse the ntlmssp_hash is not
256 constant, but is is rather updated with each
257 iteration */
258
259 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, data, length);
260 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, sig->data+4, sig->length-4);
261 /* increment counter on send */
262 gensec_ntlmssp_state->crypt.ntlm.seq_num++;
263 nt_status = NT_STATUS_OK;
264 }
265 dump_data_pw("ntlmssp signature\n", sig->data, sig->length);
266 dump_data_pw("ntlmssp sealed data\n", data, length);
267
268
269 return nt_status;
270 }
271
272 /**
273 * Unseal data with the NTLMSSP algorithm
274 *
275 */
276
277 /*
278 wrappers for the ntlmssp_*() functions
279 */
280 NTSTATUS gensec_ntlmssp_unseal_packet(struct gensec_security *gensec_security,
281 TALLOC_CTX *sig_mem_ctx,
282 uint8_t *data, size_t length,
283 const uint8_t *whole_pdu, size_t pdu_length,
284 const DATA_BLOB *sig)
285 {
286 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
287 if (!gensec_ntlmssp_state->session_key.length) {
288 DEBUG(3, ("NO session key, cannot unseal packet\n"));
289 return NT_STATUS_NO_USER_SESSION_KEY;
290 }
291
292 dump_data_pw("ntlmssp sealed data\n", data, length);
293 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
294 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state, data, length);
295 } else {
296 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, data, length);
297 }
298 dump_data_pw("ntlmssp clear data\n", data, length);
299 return gensec_ntlmssp_check_packet(gensec_security, sig_mem_ctx, data, length, whole_pdu, pdu_length, sig);
300 }
301
302 /**
303 Initialise the state for NTLMSSP signing.
304 */
305 /* TODO: make this non-public */
306 NTSTATUS ntlmssp_sign_init(struct gensec_ntlmssp_state *gensec_ntlmssp_state)
307 {
308 TALLOC_CTX *mem_ctx = talloc_new(gensec_ntlmssp_state);
309
310 if (!mem_ctx) {
311 return NT_STATUS_NO_MEMORY;
312 }
313
314 DEBUG(3, ("NTLMSSP Sign/Seal - Initialising with flags:\n"));
315 debug_ntlmssp_flags(gensec_ntlmssp_state->neg_flags);
316
317 if (gensec_ntlmssp_state->session_key.length < 8) {
318 talloc_free(mem_ctx);
319 DEBUG(3, ("NO session key, cannot intialise signing\n"));
320 return NT_STATUS_NO_USER_SESSION_KEY;
321 }
322
323 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
324 {
325 DATA_BLOB weak_session_key = gensec_ntlmssp_state->session_key;
326 const char *send_sign_const;
327 const char *send_seal_const;
328 const char *recv_sign_const;
329 const char *recv_seal_const;
330
331 DATA_BLOB send_seal_key;
332 DATA_BLOB recv_seal_key;
333
334 switch (gensec_ntlmssp_state->role) {
335 case NTLMSSP_CLIENT:
336 send_sign_const = CLI_SIGN;
337 send_seal_const = CLI_SEAL;
338 recv_sign_const = SRV_SIGN;
339 recv_seal_const = SRV_SEAL;
340 break;
341 case NTLMSSP_SERVER:
342 send_sign_const = SRV_SIGN;
343 send_seal_const = SRV_SEAL;
344 recv_sign_const = CLI_SIGN;
345 recv_seal_const = CLI_SEAL;
346 break;
347 default:
348 talloc_free(mem_ctx);
349 return NT_STATUS_INTERNAL_ERROR;
350 }
351
352 gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
353 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state);
354 gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
355 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state);
356
357 /**
358 Weaken NTLMSSP keys to cope with down-level
359 clients, servers and export restrictions.
360
361 We probably should have some parameters to control
362 this, once we get NTLM2 working.
363 */
364
365 /* Key weakening was not performed on the master key
366 * for NTLM2 (in ntlmssp_weaken_keys()), but must be
367 * done on the encryption subkeys only. That is why
368 * we don't have this code for the ntlmv1 case.
369 */
370
371 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_128) {
372
373 } else if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
374 weak_session_key.length = 7;
375 } else { /* forty bits */
376 weak_session_key.length = 5;
377 }
378 dump_data_pw("NTLMSSP weakend master key:\n",
379 weak_session_key.data,
380 weak_session_key.length);
381
382 /* SEND: sign key */
383 calc_ntlmv2_key(gensec_ntlmssp_state,
384 &gensec_ntlmssp_state->crypt.ntlm2.send_sign_key,
385 gensec_ntlmssp_state->session_key, send_sign_const);
386 dump_data_pw("NTLMSSP send sign key:\n",
387 gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.data,
388 gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.length);
389
390 /* SEND: seal ARCFOUR pad */
391 calc_ntlmv2_key(mem_ctx,
392 &send_seal_key,
393 weak_session_key, send_seal_const);
394 dump_data_pw("NTLMSSP send seal key:\n",
395 send_seal_key.data,
396 send_seal_key.length);
397 arcfour_init(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state,
398 &send_seal_key);
399 dump_data_pw("NTLMSSP send sesl hash:\n",
400 gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state->sbox,
401 sizeof(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state->sbox));
402
403 /* RECV: sign key */
404 calc_ntlmv2_key(gensec_ntlmssp_state,
405 &gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key,
406 gensec_ntlmssp_state->session_key, recv_sign_const);
407 dump_data_pw("NTLMSSP recv sign key:\n",
408 gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
409 gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.length);
410
411 /* RECV: seal ARCFOUR pad */
412 calc_ntlmv2_key(mem_ctx,
413 &recv_seal_key,
414 weak_session_key, recv_seal_const);
415 dump_data_pw("NTLMSSP recv seal key:\n",
416 recv_seal_key.data,
417 recv_seal_key.length);
418 arcfour_init(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state,
419 &recv_seal_key);
420 dump_data_pw("NTLMSSP receive seal hash:\n",
421 gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state->sbox,
422 sizeof(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state->sbox));
423
424 gensec_ntlmssp_state->crypt.ntlm2.send_seq_num = 0;
425 gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num = 0;
426
427 } else {
428 DATA_BLOB weak_session_key = ntlmssp_weakend_key(gensec_ntlmssp_state, mem_ctx);
429 DEBUG(5, ("NTLMSSP Sign/Seal - using NTLM1\n"));
430
431 gensec_ntlmssp_state->crypt.ntlm.arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
432 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm.arcfour_state);
433
434 arcfour_init(gensec_ntlmssp_state->crypt.ntlm.arcfour_state,
435 &weak_session_key);
436 dump_data_pw("NTLMSSP hash:\n", gensec_ntlmssp_state->crypt.ntlm.arcfour_state->sbox,
437 sizeof(gensec_ntlmssp_state->crypt.ntlm.arcfour_state->sbox));
438
439 gensec_ntlmssp_state->crypt.ntlm.seq_num = 0;
440 }
441
442 talloc_free(mem_ctx);
443 return NT_STATUS_OK;
444 }
445
446 size_t gensec_ntlmssp_sig_size(struct gensec_security *gensec_security, size_t data_size)
447 {
448 return NTLMSSP_SIG_SIZE;
449 }
450
451 NTSTATUS gensec_ntlmssp_wrap(struct gensec_security *gensec_security,
452 TALLOC_CTX *sig_mem_ctx,
453 const DATA_BLOB *in,
454 DATA_BLOB *out)
455 {
456 DATA_BLOB sig;
457 NTSTATUS nt_status;
458
459 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
460
461 *out = data_blob_talloc(sig_mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
462 if (!out->data) {
463 return NT_STATUS_NO_MEMORY;
464 }
465 memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
466
467 nt_status = gensec_ntlmssp_seal_packet(gensec_security, sig_mem_ctx,
468 out->data + NTLMSSP_SIG_SIZE,
469 out->length - NTLMSSP_SIG_SIZE,
470 out->data + NTLMSSP_SIG_SIZE,
471 out->length - NTLMSSP_SIG_SIZE,
472 &sig);
473
474 if (NT_STATUS_IS_OK(nt_status)) {
475 memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
476 }
477 return nt_status;
478
479 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
480
481 *out = data_blob_talloc(sig_mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
482 if (!out->data) {
483 return NT_STATUS_NO_MEMORY;
484 }
485 memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
486
487 nt_status = gensec_ntlmssp_sign_packet(gensec_security, sig_mem_ctx,
488 out->data + NTLMSSP_SIG_SIZE,
489 out->length - NTLMSSP_SIG_SIZE,
490 out->data + NTLMSSP_SIG_SIZE,
491 out->length - NTLMSSP_SIG_SIZE,
492 &sig);
493
494 if (NT_STATUS_IS_OK(nt_status)) {
495 memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
496 }
497 return nt_status;
498
499 } else {
500 *out = *in;
501 return NT_STATUS_OK;
502 }
503 }
504
505
506 NTSTATUS gensec_ntlmssp_unwrap(struct gensec_security *gensec_security,
507 TALLOC_CTX *sig_mem_ctx,
508 const DATA_BLOB *in,
509 DATA_BLOB *out)
510 {
511 DATA_BLOB sig;
512
513 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
514 if (in->length < NTLMSSP_SIG_SIZE) {
515 return NT_STATUS_INVALID_PARAMETER;
516 }
517 sig.data = in->data;
518 sig.length = NTLMSSP_SIG_SIZE;
519
520 *out = data_blob_talloc(sig_mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
521
522 return gensec_ntlmssp_unseal_packet(gensec_security, sig_mem_ctx,
523 out->data, out->length,
524 out->data, out->length,
525 &sig);
526
527 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
528 if (in->length < NTLMSSP_SIG_SIZE) {
529 return NT_STATUS_INVALID_PARAMETER;
530 }
531 sig.data = in->data;
532 sig.length = NTLMSSP_SIG_SIZE;
533
534 *out = data_blob_talloc(sig_mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
535
536 return gensec_ntlmssp_check_packet(gensec_security, sig_mem_ctx,
537 out->data, out->length,
538 out->data, out->length,
539 &sig);
540 } else {
541 *out = *in;
542 return NT_STATUS_OK;
543 }
544 }
545
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