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s3: winbindd: Old NT Domain code sets struct winbind_domain->alt_name to be NULL...
[Samba.git] / auth / gensec / schannel.c
blobee23e77ace417745b2b7ba336818b6ac45f781f6
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
36 struct 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
55 static 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
80 static 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 ********************************************************************/
134 static 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
162 static 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 ********************************************************************/
213 static 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
278 static 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
354 static 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
368 static 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
444 static 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
453 static 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 switch (gensec_security->gensec_role) {
471 case GENSEC_CLIENT:
472 if (state != NULL) {
473 /* we could parse the bind ack, but we don't know what it is yet */
474 return NT_STATUS_OK;
475 }
476
477 creds = cli_credentials_get_netlogon_creds(gensec_security->credentials);
478 if (creds == NULL) {
479 return NT_STATUS_INVALID_PARAMETER_MIX;
480 }
481
482 state = netsec_create_state(gensec_security,
483 creds, true /* initiator */);
484 if (state == NULL) {
485 return NT_STATUS_NO_MEMORY;
486 }
487
488 bind_schannel.MessageType = NL_NEGOTIATE_REQUEST;
489 #if 0
490 /* to support this we'd need to have access to the full domain name */
491 /* 0x17, 23 */
492 bind_schannel.Flags = NL_FLAG_OEM_NETBIOS_DOMAIN_NAME |
493 NL_FLAG_OEM_NETBIOS_COMPUTER_NAME |
494 NL_FLAG_UTF8_DNS_DOMAIN_NAME |
495 NL_FLAG_UTF8_NETBIOS_COMPUTER_NAME;
496 bind_schannel.oem_netbios_domain.a = cli_credentials_get_domain(gensec_security->credentials);
497 bind_schannel.oem_netbios_computer.a = creds->computer_name;
498 bind_schannel.utf8_dns_domain = cli_credentials_get_realm(gensec_security->credentials);
499 /* w2k3 refuses us if we use the full DNS workstation?
500 why? perhaps because we don't fill in the dNSHostName
501 attribute in the machine account? */
502 bind_schannel.utf8_netbios_computer = creds->computer_name;
503 #else
504 bind_schannel.Flags = NL_FLAG_OEM_NETBIOS_DOMAIN_NAME |
505 NL_FLAG_OEM_NETBIOS_COMPUTER_NAME;
506 bind_schannel.oem_netbios_domain.a = cli_credentials_get_domain(gensec_security->credentials);
507 bind_schannel.oem_netbios_computer.a = creds->computer_name;
508 #endif
509
510 ndr_err = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel,
511 (ndr_push_flags_fn_t)ndr_push_NL_AUTH_MESSAGE);
512 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
513 status = ndr_map_error2ntstatus(ndr_err);
514 DEBUG(3, ("Could not create schannel bind: %s\n",
515 nt_errstr(status)));
516 return status;
517 }
518
519 return NT_STATUS_MORE_PROCESSING_REQUIRED;
520 case GENSEC_SERVER:
521
522 if (state != NULL) {
523 /* no third leg on this protocol */
524 return NT_STATUS_INVALID_PARAMETER;
525 }
526
527 /* parse the schannel startup blob */
528 ndr_err = ndr_pull_struct_blob(&in, out_mem_ctx, &bind_schannel,
529 (ndr_pull_flags_fn_t)ndr_pull_NL_AUTH_MESSAGE);
530 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
531 status = ndr_map_error2ntstatus(ndr_err);
532 DEBUG(3, ("Could not parse incoming schannel bind: %s\n",
533 nt_errstr(status)));
534 return status;
535 }
536
537 if (bind_schannel.Flags & NL_FLAG_OEM_NETBIOS_DOMAIN_NAME) {
538 domain = bind_schannel.oem_netbios_domain.a;
539 if (strcasecmp_m(domain, lpcfg_workgroup(gensec_security->settings->lp_ctx)) != 0) {
540 DEBUG(3, ("Request for schannel to incorrect domain: %s != our domain %s\n",
541 domain, lpcfg_workgroup(gensec_security->settings->lp_ctx)));
542 return NT_STATUS_LOGON_FAILURE;
543 }
544 } else if (bind_schannel.Flags & NL_FLAG_UTF8_DNS_DOMAIN_NAME) {
545 domain = bind_schannel.utf8_dns_domain.u;
546 if (strcasecmp_m(domain, lpcfg_dnsdomain(gensec_security->settings->lp_ctx)) != 0) {
547 DEBUG(3, ("Request for schannel to incorrect domain: %s != our domain %s\n",
548 domain, lpcfg_dnsdomain(gensec_security->settings->lp_ctx)));
549 return NT_STATUS_LOGON_FAILURE;
550 }
551 } else {
552 DEBUG(3, ("Request for schannel to without domain\n"));
553 return NT_STATUS_LOGON_FAILURE;
554 }
555
556 if (bind_schannel.Flags & NL_FLAG_OEM_NETBIOS_COMPUTER_NAME) {
557 workstation = bind_schannel.oem_netbios_computer.a;
558 } else if (bind_schannel.Flags & NL_FLAG_UTF8_NETBIOS_COMPUTER_NAME) {
559 workstation = bind_schannel.utf8_netbios_computer.u;
560 } else {
561 DEBUG(3, ("Request for schannel to without netbios workstation\n"));
562 return NT_STATUS_LOGON_FAILURE;
563 }
564
565 status = schannel_get_creds_state(out_mem_ctx,
566 gensec_security->settings->lp_ctx,
567 workstation, &creds);
568 if (!NT_STATUS_IS_OK(status)) {
569 DEBUG(3, ("Could not find session key for attempted schannel connection from %s: %s\n",
570 workstation, nt_errstr(status)));
571 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_HANDLE)) {
572 return NT_STATUS_LOGON_FAILURE;
573 }
574 return status;
575 }
576
577 state = netsec_create_state(gensec_security,
578 creds, false /* not initiator */);
579 if (state == NULL) {
580 return NT_STATUS_NO_MEMORY;
581 }
582
583 status = auth_anonymous_user_info_dc(state,
584 lpcfg_netbios_name(gensec_security->settings->lp_ctx),
585 &state->user_info_dc);
586 if (!NT_STATUS_IS_OK(status)) {
587 return status;
588 }
589
590 bind_schannel_ack.MessageType = NL_NEGOTIATE_RESPONSE;
591 bind_schannel_ack.Flags = 0;
592 bind_schannel_ack.Buffer.dummy = 0x6c0000; /* actually I think
593 * this does not have
594 * any meaning here
595 * - gd */
596
597 ndr_err = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel_ack,
598 (ndr_push_flags_fn_t)ndr_push_NL_AUTH_MESSAGE);
599 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
600 status = ndr_map_error2ntstatus(ndr_err);
601 DEBUG(3, ("Could not return schannel bind ack for client %s: %s\n",
602 workstation, nt_errstr(status)));
603 return status;
604 }
605
606 return NT_STATUS_OK;
607 }
608 return NT_STATUS_INVALID_PARAMETER;
609 }
610
611 /**
612 * Returns anonymous credentials for schannel, matching Win2k3.
613 *
614 */
615
616 static NTSTATUS schannel_session_info(struct gensec_security *gensec_security,
617 TALLOC_CTX *mem_ctx,
618 struct auth_session_info **_session_info)
619 {
620 struct schannel_state *state =
621 talloc_get_type(gensec_security->private_data,
622 struct schannel_state);
623 struct auth4_context *auth_ctx = gensec_security->auth_context;
624 struct auth_session_info *session_info = NULL;
625 uint32_t session_info_flags = 0;
626 NTSTATUS status;
627
628 if (auth_ctx == NULL) {
629 DEBUG(0, ("Cannot generate a session_info without the auth_context\n"));
630 return NT_STATUS_INTERNAL_ERROR;
631 }
632
633 if (auth_ctx->generate_session_info == NULL) {
634 DEBUG(0, ("Cannot generate a session_info without the generate_session_info hook\n"));
635 return NT_STATUS_INTERNAL_ERROR;
636 }
637
638 if (gensec_security->want_features & GENSEC_FEATURE_UNIX_TOKEN) {
639 session_info_flags |= AUTH_SESSION_INFO_UNIX_TOKEN;
640 }
641
642 session_info_flags |= AUTH_SESSION_INFO_SIMPLE_PRIVILEGES;
643
644 status = auth_ctx->generate_session_info(
645 auth_ctx,
646 mem_ctx,
647 state->user_info_dc,
648 state->user_info_dc->info->account_name,
649 session_info_flags,
650 &session_info);
651 if (!NT_STATUS_IS_OK(status)) {
652 return status;
653 }
654
655 *_session_info = session_info;
656 return NT_STATUS_OK;
657 }
658
659 static NTSTATUS schannel_server_start(struct gensec_security *gensec_security)
660 {
661 return NT_STATUS_OK;
662 }
663
664 static NTSTATUS schannel_client_start(struct gensec_security *gensec_security)
665 {
666 return NT_STATUS_OK;
667 }
668
669 static bool schannel_have_feature(struct gensec_security *gensec_security,
670 uint32_t feature)
671 {
672 if (feature & (GENSEC_FEATURE_SIGN |
673 GENSEC_FEATURE_SEAL)) {
674 return true;
675 }
676 if (feature & GENSEC_FEATURE_DCE_STYLE) {
677 return true;
678 }
679 if (feature & GENSEC_FEATURE_SIGN_PKT_HEADER) {
680 return true;
681 }
682 return false;
683 }
684
685 /*
686 unseal a packet
687 */
688 static NTSTATUS schannel_unseal_packet(struct gensec_security *gensec_security,
689 uint8_t *data, size_t length,
690 const uint8_t *whole_pdu, size_t pdu_length,
691 const DATA_BLOB *sig)
692 {
693 struct schannel_state *state =
694 talloc_get_type_abort(gensec_security->private_data,
695 struct schannel_state);
696
697 return netsec_incoming_packet(state, true,
698 discard_const_p(uint8_t, data),
699 length,
700 whole_pdu, pdu_length,
701 sig);
702 }
703
704 /*
705 check the signature on a packet
706 */
707 static NTSTATUS schannel_check_packet(struct gensec_security *gensec_security,
708 const uint8_t *data, size_t length,
709 const uint8_t *whole_pdu, size_t pdu_length,
710 const DATA_BLOB *sig)
711 {
712 struct schannel_state *state =
713 talloc_get_type_abort(gensec_security->private_data,
714 struct schannel_state);
715
716 return netsec_incoming_packet(state, false,
717 discard_const_p(uint8_t, data),
718 length,
719 whole_pdu, pdu_length,
720 sig);
721 }
722 /*
723 seal a packet
724 */
725 static NTSTATUS schannel_seal_packet(struct gensec_security *gensec_security,
726 TALLOC_CTX *mem_ctx,
727 uint8_t *data, size_t length,
728 const uint8_t *whole_pdu, size_t pdu_length,
729 DATA_BLOB *sig)
730 {
731 struct schannel_state *state =
732 talloc_get_type_abort(gensec_security->private_data,
733 struct schannel_state);
734
735 return netsec_outgoing_packet(state, mem_ctx, true,
736 data, length,
737 whole_pdu, pdu_length,
738 sig);
739 }
740
741 /*
742 sign a packet
743 */
744 static NTSTATUS schannel_sign_packet(struct gensec_security *gensec_security,
745 TALLOC_CTX *mem_ctx,
746 const uint8_t *data, size_t length,
747 const uint8_t *whole_pdu, size_t pdu_length,
748 DATA_BLOB *sig)
749 {
750 struct schannel_state *state =
751 talloc_get_type_abort(gensec_security->private_data,
752 struct schannel_state);
753
754 return netsec_outgoing_packet(state, mem_ctx, false,
755 discard_const_p(uint8_t, data),
756 length,
757 whole_pdu, pdu_length,
758 sig);
759 }
760
761 static const struct gensec_security_ops gensec_schannel_security_ops = {
762 .name = "schannel",
763 .auth_type = DCERPC_AUTH_TYPE_SCHANNEL,
764 .client_start = schannel_client_start,
765 .server_start = schannel_server_start,
766 .update = schannel_update,
767 .seal_packet = schannel_seal_packet,
768 .sign_packet = schannel_sign_packet,
769 .check_packet = schannel_check_packet,
770 .unseal_packet = schannel_unseal_packet,
771 .session_info = schannel_session_info,
772 .sig_size = schannel_sig_size,
773 .have_feature = schannel_have_feature,
774 .enabled = true,
775 .priority = GENSEC_SCHANNEL
776 };
777
778 _PUBLIC_ NTSTATUS gensec_schannel_init(void)
779 {
780 NTSTATUS ret;
781 ret = gensec_register(&gensec_schannel_security_ops);
782 if (!NT_STATUS_IS_OK(ret)) {
783 DEBUG(0,("Failed to register '%s' gensec backend!\n",
784 gensec_schannel_security_ops.name));
785 return ret;
786 }
787
788 return ret;
789 }
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