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s4:ntlmssp: split gensec_ntlmssp_check_packet() and ntlmssp_check_packet()
[Samba/ekacnet.git] / source4 / auth / ntlmssp / ntlmssp_sign.c
blob3c18c34f827c0022907c23144c26bb1d185b1b00
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 gensec_ntlmssp_seal_packet(struct gensec_security *gensec_security,
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 struct gensec_ntlmssp_context *gensec_ntlmssp =
221 talloc_get_type_abort(gensec_security->private_data,
222 struct gensec_ntlmssp_context);
223 struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
224 NTSTATUS nt_status;
225 if (!gensec_ntlmssp_state->session_key.length) {
226 DEBUG(3, ("NO session key, cannot seal packet\n"));
227 return NT_STATUS_NO_USER_SESSION_KEY;
228 }
229
230 DEBUG(10,("ntlmssp_seal_data: seal\n"));
231 dump_data_pw("ntlmssp clear data\n", data, length);
232 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
233 /* The order of these two operations matters - we must first seal the packet,
234 then seal the sequence number - this is because the send_seal_hash is not
235 constant, but is is rather updated with each iteration */
236 nt_status = ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
237 data, length,
238 whole_pdu, pdu_length,
239 NTLMSSP_SEND, sig, false);
240 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, data, length);
241 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
242 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, sig->data+4, 8);
243 }
244 } else {
245 uint32_t crc;
246 crc = crc32_calc_buffer(data, length);
247 if (!msrpc_gen(sig_mem_ctx,
248 sig, "dddd", NTLMSSP_SIGN_VERSION, 0, crc, gensec_ntlmssp_state->crypt.ntlm.seq_num)) {
249 return NT_STATUS_NO_MEMORY;
250 }
251
252 /* The order of these two operations matters - we must
253 first seal the packet, then seal the sequence
254 number - this is because the ntlmssp_hash is not
255 constant, but is is rather updated with each
256 iteration */
257
258 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, data, length);
259 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, sig->data+4, sig->length-4);
260 /* increment counter on send */
261 gensec_ntlmssp_state->crypt.ntlm.seq_num++;
262 nt_status = NT_STATUS_OK;
263 }
264 dump_data_pw("ntlmssp signature\n", sig->data, sig->length);
265 dump_data_pw("ntlmssp sealed data\n", data, length);
266
267
268 return nt_status;
269 }
270
271 /**
272 * Unseal data with the NTLMSSP algorithm
273 *
274 */
275
276 /*
277 wrappers for the ntlmssp_*() functions
278 */
279 NTSTATUS gensec_ntlmssp_unseal_packet(struct gensec_security *gensec_security,
280 TALLOC_CTX *sig_mem_ctx,
281 uint8_t *data, size_t length,
282 const uint8_t *whole_pdu, size_t pdu_length,
283 const DATA_BLOB *sig)
284 {
285 NTSTATUS status;
286 struct gensec_ntlmssp_context *gensec_ntlmssp =
287 talloc_get_type_abort(gensec_security->private_data,
288 struct gensec_ntlmssp_context);
289 struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
290 if (!gensec_ntlmssp_state->session_key.length) {
291 DEBUG(3, ("NO session key, cannot unseal packet\n"));
292 return NT_STATUS_NO_USER_SESSION_KEY;
293 }
294
295 dump_data_pw("ntlmssp sealed data\n", data, length);
296 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
297 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state, data, length);
298 } else {
299 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, data, length);
300 }
301 dump_data_pw("ntlmssp clear data\n", data, length);
302 status = gensec_ntlmssp_check_packet(gensec_security, sig_mem_ctx, data, length, whole_pdu, pdu_length, sig);
303
304 if (!NT_STATUS_IS_OK(status)) {
305 DEBUG(1, ("NTLMSSP packet check for unseal failed due to invalid signature on %llu bytes of input:\n", (unsigned long long)length));
306 }
307 return status;
308 }
309
310 /**
311 Initialise the state for NTLMSSP signing.
312 */
313 /* TODO: make this non-public */
314 NTSTATUS ntlmssp_sign_init(struct gensec_ntlmssp_state *gensec_ntlmssp_state)
315 {
316 TALLOC_CTX *mem_ctx = talloc_new(gensec_ntlmssp_state);
317
318 if (!mem_ctx) {
319 return NT_STATUS_NO_MEMORY;
320 }
321
322 DEBUG(3, ("NTLMSSP Sign/Seal - Initialising with flags:\n"));
323 debug_ntlmssp_flags(gensec_ntlmssp_state->neg_flags);
324
325 if (gensec_ntlmssp_state->session_key.length < 8) {
326 talloc_free(mem_ctx);
327 DEBUG(3, ("NO session key, cannot intialise signing\n"));
328 return NT_STATUS_NO_USER_SESSION_KEY;
329 }
330
331 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
332 {
333 DATA_BLOB weak_session_key = gensec_ntlmssp_state->session_key;
334 const char *send_sign_const;
335 const char *send_seal_const;
336 const char *recv_sign_const;
337 const char *recv_seal_const;
338
339 DATA_BLOB send_seal_key;
340 DATA_BLOB recv_seal_key;
341
342 switch (gensec_ntlmssp_state->role) {
343 case NTLMSSP_CLIENT:
344 send_sign_const = CLI_SIGN;
345 send_seal_const = CLI_SEAL;
346 recv_sign_const = SRV_SIGN;
347 recv_seal_const = SRV_SEAL;
348 break;
349 case NTLMSSP_SERVER:
350 send_sign_const = SRV_SIGN;
351 send_seal_const = SRV_SEAL;
352 recv_sign_const = CLI_SIGN;
353 recv_seal_const = CLI_SEAL;
354 break;
355 default:
356 talloc_free(mem_ctx);
357 return NT_STATUS_INTERNAL_ERROR;
358 }
359
360 gensec_ntlmssp_state->crypt.ntlm2.send_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 gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
363 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state);
364
365 /**
366 Weaken NTLMSSP keys to cope with down-level
367 clients, servers and export restrictions.
368
369 We probably should have some parameters to control
370 this, once we get NTLM2 working.
371 */
372
373 /* Key weakening was not performed on the master key
374 * for NTLM2 (in ntlmssp_weaken_keys()), but must be
375 * done on the encryption subkeys only. That is why
376 * we don't have this code for the ntlmv1 case.
377 */
378
379 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_128) {
380
381 } else if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
382 weak_session_key.length = 7;
383 } else { /* forty bits */
384 weak_session_key.length = 5;
385 }
386 dump_data_pw("NTLMSSP weakend master key:\n",
387 weak_session_key.data,
388 weak_session_key.length);
389
390 /* SEND: sign key */
391 calc_ntlmv2_key(gensec_ntlmssp_state,
392 &gensec_ntlmssp_state->crypt.ntlm2.send_sign_key,
393 gensec_ntlmssp_state->session_key, send_sign_const);
394 dump_data_pw("NTLMSSP send sign key:\n",
395 gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.data,
396 gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.length);
397
398 /* SEND: seal ARCFOUR pad */
399 calc_ntlmv2_key(mem_ctx,
400 &send_seal_key,
401 weak_session_key, send_seal_const);
402 dump_data_pw("NTLMSSP send seal key:\n",
403 send_seal_key.data,
404 send_seal_key.length);
405 arcfour_init(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state,
406 &send_seal_key);
407 dump_data_pw("NTLMSSP send sesl hash:\n",
408 gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state->sbox,
409 sizeof(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state->sbox));
410
411 /* RECV: sign key */
412 calc_ntlmv2_key(gensec_ntlmssp_state,
413 &gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key,
414 gensec_ntlmssp_state->session_key, recv_sign_const);
415 dump_data_pw("NTLMSSP recv sign key:\n",
416 gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
417 gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.length);
418
419 /* RECV: seal ARCFOUR pad */
420 calc_ntlmv2_key(mem_ctx,
421 &recv_seal_key,
422 weak_session_key, recv_seal_const);
423 dump_data_pw("NTLMSSP recv seal key:\n",
424 recv_seal_key.data,
425 recv_seal_key.length);
426 arcfour_init(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state,
427 &recv_seal_key);
428 dump_data_pw("NTLMSSP receive seal hash:\n",
429 gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state->sbox,
430 sizeof(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state->sbox));
431
432 gensec_ntlmssp_state->crypt.ntlm2.send_seq_num = 0;
433 gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num = 0;
434
435 } else {
436 DATA_BLOB weak_session_key = ntlmssp_weakend_key(gensec_ntlmssp_state, mem_ctx);
437 DEBUG(5, ("NTLMSSP Sign/Seal - using NTLM1\n"));
438
439 gensec_ntlmssp_state->crypt.ntlm.arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
440 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm.arcfour_state);
441
442 arcfour_init(gensec_ntlmssp_state->crypt.ntlm.arcfour_state,
443 &weak_session_key);
444 dump_data_pw("NTLMSSP hash:\n", gensec_ntlmssp_state->crypt.ntlm.arcfour_state->sbox,
445 sizeof(gensec_ntlmssp_state->crypt.ntlm.arcfour_state->sbox));
446
447 gensec_ntlmssp_state->crypt.ntlm.seq_num = 0;
448 }
449
450 talloc_free(mem_ctx);
451 return NT_STATUS_OK;
452 }
453
454 NTSTATUS gensec_ntlmssp_sign_packet(struct gensec_security *gensec_security,
455 TALLOC_CTX *sig_mem_ctx,
456 const uint8_t *data, size_t length,
457 const uint8_t *whole_pdu, size_t pdu_length,
458 DATA_BLOB *sig)
459 {
460 struct gensec_ntlmssp_context *gensec_ntlmssp =
461 talloc_get_type_abort(gensec_security->private_data,
462 struct gensec_ntlmssp_context);
463 NTSTATUS nt_status;
464
465 nt_status = ntlmssp_sign_packet(gensec_ntlmssp->ntlmssp_state,
466 sig_mem_ctx,
467 data, length,
468 whole_pdu, pdu_length,
469 sig);
470
471 return nt_status;
472 }
473
474 NTSTATUS gensec_ntlmssp_check_packet(struct gensec_security *gensec_security,
475 TALLOC_CTX *sig_mem_ctx,
476 const uint8_t *data, size_t length,
477 const uint8_t *whole_pdu, size_t pdu_length,
478 const DATA_BLOB *sig)
479 {
480 struct gensec_ntlmssp_context *gensec_ntlmssp =
481 talloc_get_type_abort(gensec_security->private_data,
482 struct gensec_ntlmssp_context);
483 NTSTATUS nt_status;
484
485 nt_status = ntlmssp_check_packet(gensec_ntlmssp->ntlmssp_state,
486 sig_mem_ctx,
487 data, length,
488 whole_pdu, pdu_length,
489 sig);
490
491 return nt_status;
492 }
493
494 size_t gensec_ntlmssp_sig_size(struct gensec_security *gensec_security, size_t data_size)
495 {
496 return NTLMSSP_SIG_SIZE;
497 }
498
499 NTSTATUS gensec_ntlmssp_wrap(struct gensec_security *gensec_security,
500 TALLOC_CTX *sig_mem_ctx,
501 const DATA_BLOB *in,
502 DATA_BLOB *out)
503 {
504 DATA_BLOB sig;
505 NTSTATUS nt_status;
506
507 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
508
509 *out = data_blob_talloc(sig_mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
510 if (!out->data) {
511 return NT_STATUS_NO_MEMORY;
512 }
513 memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
514
515 nt_status = gensec_ntlmssp_seal_packet(gensec_security, sig_mem_ctx,
516 out->data + NTLMSSP_SIG_SIZE,
517 out->length - NTLMSSP_SIG_SIZE,
518 out->data + NTLMSSP_SIG_SIZE,
519 out->length - NTLMSSP_SIG_SIZE,
520 &sig);
521
522 if (NT_STATUS_IS_OK(nt_status)) {
523 memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
524 }
525 return nt_status;
526
527 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
528
529 *out = data_blob_talloc(sig_mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
530 if (!out->data) {
531 return NT_STATUS_NO_MEMORY;
532 }
533 memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
534
535 nt_status = gensec_ntlmssp_sign_packet(gensec_security, sig_mem_ctx,
536 out->data + NTLMSSP_SIG_SIZE,
537 out->length - NTLMSSP_SIG_SIZE,
538 out->data + NTLMSSP_SIG_SIZE,
539 out->length - NTLMSSP_SIG_SIZE,
540 &sig);
541
542 if (NT_STATUS_IS_OK(nt_status)) {
543 memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
544 }
545 return nt_status;
546
547 } else {
548 *out = *in;
549 return NT_STATUS_OK;
550 }
551 }
552
553
554 NTSTATUS gensec_ntlmssp_unwrap(struct gensec_security *gensec_security,
555 TALLOC_CTX *sig_mem_ctx,
556 const DATA_BLOB *in,
557 DATA_BLOB *out)
558 {
559 struct gensec_ntlmssp_context *gensec_ntlmssp =
560 talloc_get_type_abort(gensec_security->private_data,
561 struct gensec_ntlmssp_context);
562 struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
563 DATA_BLOB sig;
564
565 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
566 if (in->length < NTLMSSP_SIG_SIZE) {
567 return NT_STATUS_INVALID_PARAMETER;
568 }
569 sig.data = in->data;
570 sig.length = NTLMSSP_SIG_SIZE;
571
572 *out = data_blob_talloc(sig_mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
573
574 return gensec_ntlmssp_unseal_packet(gensec_security, sig_mem_ctx,
575 out->data, out->length,
576 out->data, out->length,
577 &sig);
578
579 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
580 NTSTATUS status;
581 uint32_t ntlm_seqnum;
582 struct arcfour_state ntlm_state;
583 uint32_t ntlm2_seqnum_r;
584 uint8_t ntlm2_key_r[16];
585 struct arcfour_state ntlm2_state_r;
586
587 if (in->length < NTLMSSP_SIG_SIZE) {
588 return NT_STATUS_INVALID_PARAMETER;
589 }
590 sig.data = in->data;
591 sig.length = NTLMSSP_SIG_SIZE;
592 *out = data_blob_talloc(sig_mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
593
594 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
595 ntlm2_seqnum_r = gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num;
596 ntlm2_state_r = *gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state;
597 memcpy(ntlm2_key_r,
598 gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
599 16);
600 } else {
601 ntlm_seqnum = gensec_ntlmssp_state->crypt.ntlm.seq_num;
602 ntlm_state = *gensec_ntlmssp_state->crypt.ntlm.arcfour_state;
603 }
604
605 status = gensec_ntlmssp_check_packet(gensec_security, sig_mem_ctx,
606 out->data, out->length,
607 out->data, out->length,
608 &sig);
609 if (!NT_STATUS_IS_OK(status)) {
610 NTSTATUS check_status = status;
611 /*
612 * The Windows LDAP libraries seems to have a bug
613 * and always use sealing even if only signing was
614 * negotiated. So we need to fallback.
615 */
616
617 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
618 gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num = ntlm2_seqnum_r;
619 *gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state = ntlm2_state_r;
620 memcpy(gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
621 ntlm2_key_r, 16);
622 } else {
623 gensec_ntlmssp_state->crypt.ntlm.seq_num = ntlm_seqnum;
624 *gensec_ntlmssp_state->crypt.ntlm.arcfour_state = ntlm_state;
625 }
626
627 status = gensec_ntlmssp_unseal_packet(gensec_security,
628 sig_mem_ctx,
629 out->data,
630 out->length,
631 out->data,
632 out->length,
633 &sig);
634 if (NT_STATUS_IS_OK(status)) {
635 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
636 } else {
637 status = check_status;
638 }
639 }
640
641 if (!NT_STATUS_IS_OK(status)) {
642 DEBUG(1, ("NTLMSSP packet check for unwrap failed due to invalid signature\n"));
643 }
644 return status;
645 } else {
646 *out = *in;
647 return NT_STATUS_OK;
648 }
649 }
650