source: vendor/current/auth/gensec/schannel.c

Last change on this file was 988, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.3
File size: 21.3 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3
4 dcerpc schannel operations
5
6 Copyright (C) Andrew Tridgell 2004
7 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
21*/
22
23#include "includes.h"
24#include "librpc/gen_ndr/ndr_schannel.h"
25#include "auth/auth.h"
26#include "auth/credentials/credentials.h"
27#include "auth/gensec/gensec.h"
28#include "auth/gensec/gensec_internal.h"
29#include "auth/gensec/gensec_proto.h"
30#include "../libcli/auth/schannel.h"
31#include "librpc/gen_ndr/dcerpc.h"
32#include "param/param.h"
33#include "auth/gensec/gensec_toplevel_proto.h"
34#include "lib/crypto/crypto.h"
35
36struct schannel_state {
37 struct gensec_security *gensec;
38 uint64_t seq_num;
39 bool initiator;
40 struct netlogon_creds_CredentialState *creds;
41 struct auth_user_info_dc *user_info_dc;
42};
43
44#define SETUP_SEQNUM(state, buf, initiator) do { \
45 uint8_t *_buf = buf; \
46 uint32_t _seq_num_low = (state)->seq_num & UINT32_MAX; \
47 uint32_t _seq_num_high = (state)->seq_num >> 32; \
48 if (initiator) { \
49 _seq_num_high |= 0x80000000; \
50 } \
51 RSIVAL(_buf, 0, _seq_num_low); \
52 RSIVAL(_buf, 4, _seq_num_high); \
53} while(0)
54
55static struct schannel_state *netsec_create_state(
56 struct gensec_security *gensec,
57 struct netlogon_creds_CredentialState *creds,
58 bool initiator)
59{
60 struct schannel_state *state;
61
62 state = talloc_zero(gensec, struct schannel_state);
63 if (state == NULL) {
64 return NULL;
65 }
66
67 state->gensec = gensec;
68 state->initiator = initiator;
69 state->creds = netlogon_creds_copy(state, creds);
70 if (state->creds == NULL) {
71 talloc_free(state);
72 return NULL;
73 }
74
75 gensec->private_data = state;
76
77 return state;
78}
79
80static void netsec_offset_and_sizes(struct schannel_state *state,
81 bool do_seal,
82 uint32_t *_min_sig_size,
83 uint32_t *_used_sig_size,
84 uint32_t *_checksum_length,
85 uint32_t *_confounder_ofs)
86{
87 uint32_t min_sig_size;
88 uint32_t used_sig_size;
89 uint32_t checksum_length;
90 uint32_t confounder_ofs;
91
92 if (state->creds->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
93 min_sig_size = 48;
94 used_sig_size = 56;
95 /*
96 * Note: windows has a bug here and uses the old values...
97 *
98 * checksum_length = 32;
99 * confounder_ofs = 48;
100 */
101 checksum_length = 8;
102 confounder_ofs = 24;
103 } else {
104 min_sig_size = 24;
105 used_sig_size = 32;
106 checksum_length = 8;
107 confounder_ofs = 24;
108 }
109
110 if (do_seal) {
111 min_sig_size += 8;
112 }
113
114 if (_min_sig_size) {
115 *_min_sig_size = min_sig_size;
116 }
117
118 if (_used_sig_size) {
119 *_used_sig_size = used_sig_size;
120 }
121
122 if (_checksum_length) {
123 *_checksum_length = checksum_length;
124 }
125
126 if (_confounder_ofs) {
127 *_confounder_ofs = confounder_ofs;
128 }
129}
130
131/*******************************************************************
132 Encode or Decode the sequence number (which is symmetric)
133 ********************************************************************/
134static void netsec_do_seq_num(struct schannel_state *state,
135 const uint8_t *checksum,
136 uint32_t checksum_length,
137 uint8_t seq_num[8])
138{
139 if (state->creds->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
140 AES_KEY key;
141 uint8_t iv[AES_BLOCK_SIZE];
142
143 AES_set_encrypt_key(state->creds->session_key, 128, &key);
144 ZERO_STRUCT(iv);
145 memcpy(iv+0, checksum, 8);
146 memcpy(iv+8, checksum, 8);
147
148 aes_cfb8_encrypt(seq_num, seq_num, 8, &key, iv, AES_ENCRYPT);
149 } else {
150 static const uint8_t zeros[4];
151 uint8_t sequence_key[16];
152 uint8_t digest1[16];
153
154 hmac_md5(state->creds->session_key, zeros, sizeof(zeros), digest1);
155 hmac_md5(digest1, checksum, checksum_length, sequence_key);
156 arcfour_crypt(seq_num, sequence_key, 8);
157 }
158
159 state->seq_num++;
160}
161
162static void netsec_do_seal(struct schannel_state *state,
163 const uint8_t seq_num[8],
164 uint8_t confounder[8],
165 uint8_t *data, uint32_t length,
166 bool forward)
167{
168 if (state->creds->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
169 AES_KEY key;
170 uint8_t iv[AES_BLOCK_SIZE];
171 uint8_t sess_kf0[16];
172 int i;
173
174 for (i = 0; i < 16; i++) {
175 sess_kf0[i] = state->creds->session_key[i] ^ 0xf0;
176 }
177
178 AES_set_encrypt_key(sess_kf0, 128, &key);
179 ZERO_STRUCT(iv);
180 memcpy(iv+0, seq_num, 8);
181 memcpy(iv+8, seq_num, 8);
182
183 if (forward) {
184 aes_cfb8_encrypt(confounder, confounder, 8, &key, iv, AES_ENCRYPT);
185 aes_cfb8_encrypt(data, data, length, &key, iv, AES_ENCRYPT);
186 } else {
187 aes_cfb8_encrypt(confounder, confounder, 8, &key, iv, AES_DECRYPT);
188 aes_cfb8_encrypt(data, data, length, &key, iv, AES_DECRYPT);
189 }
190 } else {
191 uint8_t sealing_key[16];
192 static const uint8_t zeros[4];
193 uint8_t digest2[16];
194 uint8_t sess_kf0[16];
195 int i;
196
197 for (i = 0; i < 16; i++) {
198 sess_kf0[i] = state->creds->session_key[i] ^ 0xf0;
199 }
200
201 hmac_md5(sess_kf0, zeros, 4, digest2);
202 hmac_md5(digest2, seq_num, 8, sealing_key);
203
204 arcfour_crypt(confounder, sealing_key, 8);
205 arcfour_crypt(data, sealing_key, length);
206 }
207}
208
209/*******************************************************************
210 Create a digest over the entire packet (including the data), and
211 MD5 it with the session key.
212 ********************************************************************/
213static void netsec_do_sign(struct schannel_state *state,
214 const uint8_t *confounder,
215 const uint8_t *data, size_t length,
216 uint8_t header[8],
217 uint8_t *checksum)
218{
219 if (state->creds->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
220 struct HMACSHA256Context ctx;
221
222 hmac_sha256_init(state->creds->session_key,
223 sizeof(state->creds->session_key),
224 &ctx);
225
226 if (confounder) {
227 SSVAL(header, 0, NL_SIGN_HMAC_SHA256);
228 SSVAL(header, 2, NL_SEAL_AES128);
229 SSVAL(header, 4, 0xFFFF);
230 SSVAL(header, 6, 0x0000);
231
232 hmac_sha256_update(header, 8, &ctx);
233 hmac_sha256_update(confounder, 8, &ctx);
234 } else {
235 SSVAL(header, 0, NL_SIGN_HMAC_SHA256);
236 SSVAL(header, 2, NL_SEAL_NONE);
237 SSVAL(header, 4, 0xFFFF);
238 SSVAL(header, 6, 0x0000);
239
240 hmac_sha256_update(header, 8, &ctx);
241 }
242
243 hmac_sha256_update(data, length, &ctx);
244
245 hmac_sha256_final(checksum, &ctx);
246 } else {
247 uint8_t packet_digest[16];
248 static const uint8_t zeros[4];
249 MD5_CTX ctx;
250
251 MD5Init(&ctx);
252 MD5Update(&ctx, zeros, 4);
253 if (confounder) {
254 SSVAL(header, 0, NL_SIGN_HMAC_MD5);
255 SSVAL(header, 2, NL_SEAL_RC4);
256 SSVAL(header, 4, 0xFFFF);
257 SSVAL(header, 6, 0x0000);
258
259 MD5Update(&ctx, header, 8);
260 MD5Update(&ctx, confounder, 8);
261 } else {
262 SSVAL(header, 0, NL_SIGN_HMAC_MD5);
263 SSVAL(header, 2, NL_SEAL_NONE);
264 SSVAL(header, 4, 0xFFFF);
265 SSVAL(header, 6, 0x0000);
266
267 MD5Update(&ctx, header, 8);
268 }
269 MD5Update(&ctx, data, length);
270 MD5Final(packet_digest, &ctx);
271
272 hmac_md5(state->creds->session_key,
273 packet_digest, sizeof(packet_digest),
274 checksum);
275 }
276}
277
278static NTSTATUS netsec_incoming_packet(struct schannel_state *state,
279 bool do_unseal,
280 uint8_t *data, size_t length,
281 const uint8_t *whole_pdu, size_t pdu_length,
282 const DATA_BLOB *sig)
283{
284 uint32_t min_sig_size = 0;
285 uint8_t header[8];
286 uint8_t checksum[32];
287 uint32_t checksum_length = sizeof(checksum_length);
288 uint8_t _confounder[8];
289 uint8_t *confounder = NULL;
290 uint32_t confounder_ofs = 0;
291 uint8_t seq_num[8];
292 int ret;
293 const uint8_t *sign_data = NULL;
294 size_t sign_length = 0;
295
296 netsec_offset_and_sizes(state,
297 do_unseal,
298 &min_sig_size,
299 NULL,
300 &checksum_length,
301 &confounder_ofs);
302
303 if (sig->length < min_sig_size) {
304 return NT_STATUS_ACCESS_DENIED;
305 }
306
307 if (do_unseal) {
308 confounder = _confounder;
309 memcpy(confounder, sig->data+confounder_ofs, 8);
310 } else {
311 confounder = NULL;
312 }
313
314 SETUP_SEQNUM(state, seq_num, !state->initiator);
315
316 if (do_unseal) {
317 netsec_do_seal(state, seq_num,
318 confounder,
319 data, length,
320 false);
321 }
322
323 if (state->gensec->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
324 sign_data = whole_pdu;
325 sign_length = pdu_length;
326 } else {
327 sign_data = data;
328 sign_length = length;
329 }
330
331 netsec_do_sign(state, confounder,
332 sign_data, sign_length,
333 header, checksum);
334
335 ret = memcmp(checksum, sig->data+16, checksum_length);
336 if (ret != 0) {
337 dump_data_pw("calc digest:", checksum, checksum_length);
338 dump_data_pw("wire digest:", sig->data+16, checksum_length);
339 return NT_STATUS_ACCESS_DENIED;
340 }
341
342 netsec_do_seq_num(state, checksum, checksum_length, seq_num);
343
344 ret = memcmp(seq_num, sig->data+8, 8);
345 if (ret != 0) {
346 dump_data_pw("calc seq num:", seq_num, 8);
347 dump_data_pw("wire seq num:", sig->data+8, 8);
348 return NT_STATUS_ACCESS_DENIED;
349 }
350
351 return NT_STATUS_OK;
352}
353
354static uint32_t netsec_outgoing_sig_size(struct schannel_state *state)
355{
356 uint32_t sig_size = 0;
357
358 netsec_offset_and_sizes(state,
359 true,
360 NULL,
361 &sig_size,
362 NULL,
363 NULL);
364
365 return sig_size;
366}
367
368static NTSTATUS netsec_outgoing_packet(struct schannel_state *state,
369 TALLOC_CTX *mem_ctx,
370 bool do_seal,
371 uint8_t *data, size_t length,
372 const uint8_t *whole_pdu, size_t pdu_length,
373 DATA_BLOB *sig)
374{
375 uint32_t min_sig_size = 0;
376 uint32_t used_sig_size = 0;
377 uint8_t header[8];
378 uint8_t checksum[32];
379 uint32_t checksum_length = sizeof(checksum_length);
380 uint8_t _confounder[8];
381 uint8_t *confounder = NULL;
382 uint32_t confounder_ofs = 0;
383 uint8_t seq_num[8];
384 const uint8_t *sign_data = NULL;
385 size_t sign_length = 0;
386
387 netsec_offset_and_sizes(state,
388 do_seal,
389 &min_sig_size,
390 &used_sig_size,
391 &checksum_length,
392 &confounder_ofs);
393
394 SETUP_SEQNUM(state, seq_num, state->initiator);
395
396 if (do_seal) {
397 confounder = _confounder;
398 generate_random_buffer(confounder, 8);
399 } else {
400 confounder = NULL;
401 }
402
403 if (state->gensec->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
404 sign_data = whole_pdu;
405 sign_length = pdu_length;
406 } else {
407 sign_data = data;
408 sign_length = length;
409 }
410
411 netsec_do_sign(state, confounder,
412 sign_data, sign_length,
413 header, checksum);
414
415 if (do_seal) {
416 netsec_do_seal(state, seq_num,
417 confounder,
418 data, length,
419 true);
420 }
421
422 netsec_do_seq_num(state, checksum, checksum_length, seq_num);
423
424 (*sig) = data_blob_talloc_zero(mem_ctx, used_sig_size);
425
426 memcpy(sig->data, header, 8);
427 memcpy(sig->data+8, seq_num, 8);
428 memcpy(sig->data+16, checksum, checksum_length);
429
430 if (confounder) {
431 memcpy(sig->data+confounder_ofs, confounder, 8);
432 }
433
434 dump_data_pw("signature:", sig->data+ 0, 8);
435 dump_data_pw("seq_num :", sig->data+ 8, 8);
436 dump_data_pw("digest :", sig->data+16, checksum_length);
437 dump_data_pw("confound :", sig->data+confounder_ofs, 8);
438
439 return NT_STATUS_OK;
440}
441
442_PUBLIC_ NTSTATUS gensec_schannel_init(void);
443
444static size_t schannel_sig_size(struct gensec_security *gensec_security, size_t data_size)
445{
446 struct schannel_state *state =
447 talloc_get_type_abort(gensec_security->private_data,
448 struct schannel_state);
449
450 return netsec_outgoing_sig_size(state);
451}
452
453static NTSTATUS schannel_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
454 struct tevent_context *ev,
455 const DATA_BLOB in, DATA_BLOB *out)
456{
457 struct schannel_state *state =
458 talloc_get_type(gensec_security->private_data,
459 struct schannel_state);
460 NTSTATUS status;
461 enum ndr_err_code ndr_err;
462 struct NL_AUTH_MESSAGE bind_schannel = {};
463 struct NL_AUTH_MESSAGE bind_schannel_ack;
464 struct netlogon_creds_CredentialState *creds;
465 const char *workstation;
466 const char *domain;
467
468 *out = data_blob(NULL, 0);
469
470 if (gensec_security->dcerpc_auth_level < DCERPC_AUTH_LEVEL_INTEGRITY) {
471 switch (gensec_security->gensec_role) {
472 case GENSEC_CLIENT:
473 return NT_STATUS_INVALID_PARAMETER_MIX;
474 case GENSEC_SERVER:
475 return NT_STATUS_INVALID_PARAMETER;
476 }
477 return NT_STATUS_INTERNAL_ERROR;
478 }
479
480 switch (gensec_security->gensec_role) {
481 case GENSEC_CLIENT:
482 if (state != NULL) {
483 /* we could parse the bind ack, but we don't know what it is yet */
484 return NT_STATUS_OK;
485 }
486
487 creds = cli_credentials_get_netlogon_creds(gensec_security->credentials);
488 if (creds == NULL) {
489 return NT_STATUS_INVALID_PARAMETER_MIX;
490 }
491
492 state = netsec_create_state(gensec_security,
493 creds, true /* initiator */);
494 if (state == NULL) {
495 return NT_STATUS_NO_MEMORY;
496 }
497
498 bind_schannel.MessageType = NL_NEGOTIATE_REQUEST;
499
500 bind_schannel.Flags = NL_FLAG_OEM_NETBIOS_DOMAIN_NAME |
501 NL_FLAG_OEM_NETBIOS_COMPUTER_NAME;
502 bind_schannel.oem_netbios_domain.a = cli_credentials_get_domain(gensec_security->credentials);
503 bind_schannel.oem_netbios_computer.a = creds->computer_name;
504
505 if (creds->secure_channel_type == SEC_CHAN_DNS_DOMAIN) {
506 bind_schannel.Flags |= NL_FLAG_UTF8_DNS_DOMAIN_NAME;
507 bind_schannel.utf8_dns_domain.u = cli_credentials_get_realm(gensec_security->credentials);
508
509 bind_schannel.Flags |= NL_FLAG_UTF8_NETBIOS_COMPUTER_NAME;
510 bind_schannel.utf8_netbios_computer.u = creds->computer_name;
511 }
512
513 ndr_err = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel,
514 (ndr_push_flags_fn_t)ndr_push_NL_AUTH_MESSAGE);
515 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
516 status = ndr_map_error2ntstatus(ndr_err);
517 DEBUG(3, ("Could not create schannel bind: %s\n",
518 nt_errstr(status)));
519 return status;
520 }
521
522 return NT_STATUS_MORE_PROCESSING_REQUIRED;
523 case GENSEC_SERVER:
524
525 if (state != NULL) {
526 /* no third leg on this protocol */
527 return NT_STATUS_INVALID_PARAMETER;
528 }
529
530 /* parse the schannel startup blob */
531 ndr_err = ndr_pull_struct_blob(&in, out_mem_ctx, &bind_schannel,
532 (ndr_pull_flags_fn_t)ndr_pull_NL_AUTH_MESSAGE);
533 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
534 status = ndr_map_error2ntstatus(ndr_err);
535 DEBUG(3, ("Could not parse incoming schannel bind: %s\n",
536 nt_errstr(status)));
537 return status;
538 }
539
540 if (bind_schannel.Flags & NL_FLAG_OEM_NETBIOS_DOMAIN_NAME) {
541 domain = bind_schannel.oem_netbios_domain.a;
542 if (strcasecmp_m(domain, lpcfg_workgroup(gensec_security->settings->lp_ctx)) != 0) {
543 DEBUG(3, ("Request for schannel to incorrect domain: %s != our domain %s\n",
544 domain, lpcfg_workgroup(gensec_security->settings->lp_ctx)));
545 return NT_STATUS_LOGON_FAILURE;
546 }
547 } else if (bind_schannel.Flags & NL_FLAG_UTF8_DNS_DOMAIN_NAME) {
548 domain = bind_schannel.utf8_dns_domain.u;
549 if (strcasecmp_m(domain, lpcfg_dnsdomain(gensec_security->settings->lp_ctx)) != 0) {
550 DEBUG(3, ("Request for schannel to incorrect domain: %s != our domain %s\n",
551 domain, lpcfg_dnsdomain(gensec_security->settings->lp_ctx)));
552 return NT_STATUS_LOGON_FAILURE;
553 }
554 } else {
555 DEBUG(3, ("Request for schannel to without domain\n"));
556 return NT_STATUS_LOGON_FAILURE;
557 }
558
559 if (bind_schannel.Flags & NL_FLAG_OEM_NETBIOS_COMPUTER_NAME) {
560 workstation = bind_schannel.oem_netbios_computer.a;
561 } else if (bind_schannel.Flags & NL_FLAG_UTF8_NETBIOS_COMPUTER_NAME) {
562 workstation = bind_schannel.utf8_netbios_computer.u;
563 } else {
564 DEBUG(3, ("Request for schannel to without netbios workstation\n"));
565 return NT_STATUS_LOGON_FAILURE;
566 }
567
568 status = schannel_get_creds_state(out_mem_ctx,
569 gensec_security->settings->lp_ctx,
570 workstation, &creds);
571 if (!NT_STATUS_IS_OK(status)) {
572 DEBUG(3, ("Could not find session key for attempted schannel connection from %s: %s\n",
573 workstation, nt_errstr(status)));
574 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_HANDLE)) {
575 return NT_STATUS_LOGON_FAILURE;
576 }
577 return status;
578 }
579
580 state = netsec_create_state(gensec_security,
581 creds, false /* not initiator */);
582 if (state == NULL) {
583 return NT_STATUS_NO_MEMORY;
584 }
585
586 status = auth_anonymous_user_info_dc(state,
587 lpcfg_netbios_name(gensec_security->settings->lp_ctx),
588 &state->user_info_dc);
589 if (!NT_STATUS_IS_OK(status)) {
590 return status;
591 }
592
593 bind_schannel_ack.MessageType = NL_NEGOTIATE_RESPONSE;
594 bind_schannel_ack.Flags = 0;
595 bind_schannel_ack.Buffer.dummy = 0x6c0000; /* actually I think
596 * this does not have
597 * any meaning here
598 * - gd */
599
600 ndr_err = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel_ack,
601 (ndr_push_flags_fn_t)ndr_push_NL_AUTH_MESSAGE);
602 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
603 status = ndr_map_error2ntstatus(ndr_err);
604 DEBUG(3, ("Could not return schannel bind ack for client %s: %s\n",
605 workstation, nt_errstr(status)));
606 return status;
607 }
608
609 return NT_STATUS_OK;
610 }
611 return NT_STATUS_INVALID_PARAMETER;
612}
613
614/**
615 * Returns anonymous credentials for schannel, matching Win2k3.
616 *
617 */
618
619static NTSTATUS schannel_session_info(struct gensec_security *gensec_security,
620 TALLOC_CTX *mem_ctx,
621 struct auth_session_info **_session_info)
622{
623 struct schannel_state *state =
624 talloc_get_type(gensec_security->private_data,
625 struct schannel_state);
626 struct auth4_context *auth_ctx = gensec_security->auth_context;
627 struct auth_session_info *session_info = NULL;
628 uint32_t session_info_flags = 0;
629 NTSTATUS status;
630
631 if (auth_ctx == NULL) {
632 DEBUG(0, ("Cannot generate a session_info without the auth_context\n"));
633 return NT_STATUS_INTERNAL_ERROR;
634 }
635
636 if (auth_ctx->generate_session_info == NULL) {
637 DEBUG(0, ("Cannot generate a session_info without the generate_session_info hook\n"));
638 return NT_STATUS_INTERNAL_ERROR;
639 }
640
641 if (gensec_security->want_features & GENSEC_FEATURE_UNIX_TOKEN) {
642 session_info_flags |= AUTH_SESSION_INFO_UNIX_TOKEN;
643 }
644
645 session_info_flags |= AUTH_SESSION_INFO_SIMPLE_PRIVILEGES;
646
647 status = auth_ctx->generate_session_info(
648 auth_ctx,
649 mem_ctx,
650 state->user_info_dc,
651 state->user_info_dc->info->account_name,
652 session_info_flags,
653 &session_info);
654 if (!NT_STATUS_IS_OK(status)) {
655 return status;
656 }
657
658 *_session_info = session_info;
659 return NT_STATUS_OK;
660}
661
662static NTSTATUS schannel_server_start(struct gensec_security *gensec_security)
663{
664 return NT_STATUS_OK;
665}
666
667static NTSTATUS schannel_client_start(struct gensec_security *gensec_security)
668{
669 return NT_STATUS_OK;
670}
671
672static bool schannel_have_feature(struct gensec_security *gensec_security,
673 uint32_t feature)
674{
675 if (gensec_security->dcerpc_auth_level >= DCERPC_AUTH_LEVEL_INTEGRITY) {
676 if (feature & GENSEC_FEATURE_SIGN) {
677 return true;
678 }
679 }
680 if (gensec_security->dcerpc_auth_level == DCERPC_AUTH_LEVEL_PRIVACY) {
681 if (feature & GENSEC_FEATURE_SEAL) {
682 return true;
683 }
684 }
685 if (feature & GENSEC_FEATURE_DCE_STYLE) {
686 return true;
687 }
688 if (feature & GENSEC_FEATURE_SIGN_PKT_HEADER) {
689 return true;
690 }
691 return false;
692}
693
694/*
695 unseal a packet
696*/
697static NTSTATUS schannel_unseal_packet(struct gensec_security *gensec_security,
698 uint8_t *data, size_t length,
699 const uint8_t *whole_pdu, size_t pdu_length,
700 const DATA_BLOB *sig)
701{
702 struct schannel_state *state =
703 talloc_get_type_abort(gensec_security->private_data,
704 struct schannel_state);
705
706 return netsec_incoming_packet(state, true,
707 discard_const_p(uint8_t, data),
708 length,
709 whole_pdu, pdu_length,
710 sig);
711}
712
713/*
714 check the signature on a packet
715*/
716static NTSTATUS schannel_check_packet(struct gensec_security *gensec_security,
717 const uint8_t *data, size_t length,
718 const uint8_t *whole_pdu, size_t pdu_length,
719 const DATA_BLOB *sig)
720{
721 struct schannel_state *state =
722 talloc_get_type_abort(gensec_security->private_data,
723 struct schannel_state);
724
725 return netsec_incoming_packet(state, false,
726 discard_const_p(uint8_t, data),
727 length,
728 whole_pdu, pdu_length,
729 sig);
730}
731/*
732 seal a packet
733*/
734static NTSTATUS schannel_seal_packet(struct gensec_security *gensec_security,
735 TALLOC_CTX *mem_ctx,
736 uint8_t *data, size_t length,
737 const uint8_t *whole_pdu, size_t pdu_length,
738 DATA_BLOB *sig)
739{
740 struct schannel_state *state =
741 talloc_get_type_abort(gensec_security->private_data,
742 struct schannel_state);
743
744 return netsec_outgoing_packet(state, mem_ctx, true,
745 data, length,
746 whole_pdu, pdu_length,
747 sig);
748}
749
750/*
751 sign a packet
752*/
753static NTSTATUS schannel_sign_packet(struct gensec_security *gensec_security,
754 TALLOC_CTX *mem_ctx,
755 const uint8_t *data, size_t length,
756 const uint8_t *whole_pdu, size_t pdu_length,
757 DATA_BLOB *sig)
758{
759 struct schannel_state *state =
760 talloc_get_type_abort(gensec_security->private_data,
761 struct schannel_state);
762
763 return netsec_outgoing_packet(state, mem_ctx, false,
764 discard_const_p(uint8_t, data),
765 length,
766 whole_pdu, pdu_length,
767 sig);
768}
769
770static const struct gensec_security_ops gensec_schannel_security_ops = {
771 .name = "schannel",
772 .auth_type = DCERPC_AUTH_TYPE_SCHANNEL,
773 .client_start = schannel_client_start,
774 .server_start = schannel_server_start,
775 .update = schannel_update,
776 .seal_packet = schannel_seal_packet,
777 .sign_packet = schannel_sign_packet,
778 .check_packet = schannel_check_packet,
779 .unseal_packet = schannel_unseal_packet,
780 .session_info = schannel_session_info,
781 .sig_size = schannel_sig_size,
782 .have_feature = schannel_have_feature,
783 .enabled = true,
784 .priority = GENSEC_SCHANNEL
785};
786
787_PUBLIC_ NTSTATUS gensec_schannel_init(void)
788{
789 NTSTATUS ret;
790 ret = gensec_register(&gensec_schannel_security_ops);
791 if (!NT_STATUS_IS_OK(ret)) {
792 DEBUG(0,("Failed to register '%s' gensec backend!\n",
793 gensec_schannel_security_ops.name));
794 return ret;
795 }
796
797 return ret;
798}
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