source: branches/samba-3.3.x/source/smbd/seal.c@ 621

Last change on this file since 621 was 206, checked in by Herwig Bauernfeind, 16 years ago

Import Samba 3.3 branch at 3.0.0 level (psmedley's port)
File size: 21.0 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 SMB Transport encryption (sealing) code - server code.
4 Copyright (C) Jeremy Allison 2007.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
18*/
19
20#include "includes.h"
21
22/******************************************************************************
23 Server side encryption.
24******************************************************************************/
25
26/******************************************************************************
27 Global server state.
28******************************************************************************/
29
30struct smb_srv_trans_enc_ctx {
31 struct smb_trans_enc_state *es;
32 AUTH_NTLMSSP_STATE *auth_ntlmssp_state; /* Must be kept in sync with pointer in ec->ntlmssp_state. */
33};
34
35static struct smb_srv_trans_enc_ctx *partial_srv_trans_enc_ctx;
36static struct smb_srv_trans_enc_ctx *srv_trans_enc_ctx;
37
38/******************************************************************************
39 Return global enc context - this must change if we ever do multiple contexts.
40******************************************************************************/
41
42uint16_t srv_enc_ctx(void)
43{
44 return srv_trans_enc_ctx->es->enc_ctx_num;
45}
46
47/******************************************************************************
48 Is this an incoming encrypted packet ?
49******************************************************************************/
50
51bool is_encrypted_packet(const uint8_t *inbuf)
52{
53 NTSTATUS status;
54 uint16_t enc_num;
55
56 /* Ignore non-session messages or non 0xFF'E' messages. */
57 if(CVAL(inbuf,0) || !(inbuf[4] == 0xFF && inbuf[5] == 'E')) {
58 return false;
59 }
60
61 status = get_enc_ctx_num(inbuf, &enc_num);
62 if (!NT_STATUS_IS_OK(status)) {
63 return false;
64 }
65
66 /* Encrypted messages are 0xFF'E'<ctx> */
67 if (srv_trans_enc_ctx && enc_num == srv_enc_ctx()) {
68 return true;
69 }
70 return false;
71}
72
73/******************************************************************************
74 Create an auth_ntlmssp_state and ensure pointer copy is correct.
75******************************************************************************/
76
77static NTSTATUS make_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
78{
79 NTSTATUS status = auth_ntlmssp_start(&ec->auth_ntlmssp_state);
80 if (!NT_STATUS_IS_OK(status)) {
81 return nt_status_squash(status);
82 }
83
84 /*
85 * We must remember to update the pointer copy for the common
86 * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
87 */
88 ec->es->s.ntlmssp_state = ec->auth_ntlmssp_state->ntlmssp_state;
89 return status;
90}
91
92/******************************************************************************
93 Destroy an auth_ntlmssp_state and ensure pointer copy is correct.
94******************************************************************************/
95
96static void destroy_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
97{
98 /*
99 * We must remember to update the pointer copy for the common
100 * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
101 */
102
103 if (ec->auth_ntlmssp_state) {
104 auth_ntlmssp_end(&ec->auth_ntlmssp_state);
105 /* The auth_ntlmssp_end killed this already. */
106 ec->es->s.ntlmssp_state = NULL;
107 }
108}
109
110#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
111
112/******************************************************************************
113 Import a name.
114******************************************************************************/
115
116static NTSTATUS get_srv_gss_creds(const char *service,
117 const char *name,
118 gss_cred_usage_t cred_type,
119 gss_cred_id_t *p_srv_cred)
120{
121 OM_uint32 ret;
122 OM_uint32 min;
123 gss_name_t srv_name;
124 gss_buffer_desc input_name;
125 char *host_princ_s = NULL;
126 NTSTATUS status = NT_STATUS_OK;
127
128 gss_OID_desc nt_hostbased_service =
129 {10, CONST_DISCARD(char *,"\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x04")};
130
131 if (asprintf(&host_princ_s, "%s@%s", service, name) == -1) {
132 return NT_STATUS_NO_MEMORY;
133 }
134
135 input_name.value = host_princ_s;
136 input_name.length = strlen(host_princ_s) + 1;
137
138 ret = gss_import_name(&min,
139 &input_name,
140 &nt_hostbased_service,
141 &srv_name);
142
143 DEBUG(10,("get_srv_gss_creds: imported name %s\n",
144 host_princ_s ));
145
146 if (ret != GSS_S_COMPLETE) {
147 SAFE_FREE(host_princ_s);
148 return map_nt_error_from_gss(ret, min);
149 }
150
151 /*
152 * We're accessing the krb5.keytab file here.
153 * ensure we have permissions to do so.
154 */
155 become_root();
156
157 ret = gss_acquire_cred(&min,
158 srv_name,
159 GSS_C_INDEFINITE,
160 GSS_C_NULL_OID_SET,
161 cred_type,
162 p_srv_cred,
163 NULL,
164 NULL);
165 unbecome_root();
166
167 if (ret != GSS_S_COMPLETE) {
168 ADS_STATUS adss = ADS_ERROR_GSS(ret, min);
169 DEBUG(10,("get_srv_gss_creds: gss_acquire_cred failed with %s\n",
170 ads_errstr(adss)));
171 status = map_nt_error_from_gss(ret, min);
172 }
173
174 SAFE_FREE(host_princ_s);
175 gss_release_name(&min, &srv_name);
176 return status;
177}
178
179/******************************************************************************
180 Create a gss state.
181 Try and get the cifs/server@realm principal first, then fall back to
182 host/server@realm.
183******************************************************************************/
184
185static NTSTATUS make_auth_gss(struct smb_srv_trans_enc_ctx *ec)
186{
187 NTSTATUS status;
188 gss_cred_id_t srv_cred;
189 fstring fqdn;
190
191 name_to_fqdn(fqdn, global_myname());
192 strlower_m(fqdn);
193
194 status = get_srv_gss_creds("cifs", fqdn, GSS_C_ACCEPT, &srv_cred);
195 if (!NT_STATUS_IS_OK(status)) {
196 status = get_srv_gss_creds("host", fqdn, GSS_C_ACCEPT, &srv_cred);
197 if (!NT_STATUS_IS_OK(status)) {
198 return nt_status_squash(status);
199 }
200 }
201
202 ec->es->s.gss_state = SMB_MALLOC_P(struct smb_tran_enc_state_gss);
203 if (!ec->es->s.gss_state) {
204 OM_uint32 min;
205 gss_release_cred(&min, &srv_cred);
206 return NT_STATUS_NO_MEMORY;
207 }
208 ZERO_STRUCTP(ec->es->s.gss_state);
209 ec->es->s.gss_state->creds = srv_cred;
210
211 /* No context yet. */
212 ec->es->s.gss_state->gss_ctx = GSS_C_NO_CONTEXT;
213
214 return NT_STATUS_OK;
215}
216#endif
217
218/******************************************************************************
219 Shutdown a server encryption context.
220******************************************************************************/
221
222static void srv_free_encryption_context(struct smb_srv_trans_enc_ctx **pp_ec)
223{
224 struct smb_srv_trans_enc_ctx *ec = *pp_ec;
225
226 if (!ec) {
227 return;
228 }
229
230 if (ec->es) {
231 switch (ec->es->smb_enc_type) {
232 case SMB_TRANS_ENC_NTLM:
233 destroy_auth_ntlmssp(ec);
234 break;
235#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
236 case SMB_TRANS_ENC_GSS:
237 break;
238#endif
239 }
240 common_free_encryption_state(&ec->es);
241 }
242
243 SAFE_FREE(ec);
244 *pp_ec = NULL;
245}
246
247/******************************************************************************
248 Create a server encryption context.
249******************************************************************************/
250
251static NTSTATUS make_srv_encryption_context(enum smb_trans_enc_type smb_enc_type, struct smb_srv_trans_enc_ctx **pp_ec)
252{
253 struct smb_srv_trans_enc_ctx *ec;
254
255 *pp_ec = NULL;
256
257 ec = SMB_MALLOC_P(struct smb_srv_trans_enc_ctx);
258 if (!ec) {
259 return NT_STATUS_NO_MEMORY;
260 }
261 ZERO_STRUCTP(partial_srv_trans_enc_ctx);
262 ec->es = SMB_MALLOC_P(struct smb_trans_enc_state);
263 if (!ec->es) {
264 SAFE_FREE(ec);
265 return NT_STATUS_NO_MEMORY;
266 }
267 ZERO_STRUCTP(ec->es);
268 ec->es->smb_enc_type = smb_enc_type;
269 switch (smb_enc_type) {
270 case SMB_TRANS_ENC_NTLM:
271 {
272 NTSTATUS status = make_auth_ntlmssp(ec);
273 if (!NT_STATUS_IS_OK(status)) {
274 srv_free_encryption_context(&ec);
275 return status;
276 }
277 }
278 break;
279
280#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
281 case SMB_TRANS_ENC_GSS:
282 /* Acquire our credentials by calling gss_acquire_cred here. */
283 {
284 NTSTATUS status = make_auth_gss(ec);
285 if (!NT_STATUS_IS_OK(status)) {
286 srv_free_encryption_context(&ec);
287 return status;
288 }
289 }
290 break;
291#endif
292 default:
293 srv_free_encryption_context(&ec);
294 return NT_STATUS_INVALID_PARAMETER;
295 }
296 *pp_ec = ec;
297 return NT_STATUS_OK;
298}
299
300/******************************************************************************
301 Free an encryption-allocated buffer.
302******************************************************************************/
303
304void srv_free_enc_buffer(char *buf)
305{
306 /* We know this is an smb buffer, and we
307 * didn't malloc, only copy, for a keepalive,
308 * so ignore non-session messages. */
309
310 if(CVAL(buf,0)) {
311 return;
312 }
313
314 if (srv_trans_enc_ctx) {
315 common_free_enc_buffer(srv_trans_enc_ctx->es, buf);
316 }
317}
318
319/******************************************************************************
320 Decrypt an incoming buffer.
321******************************************************************************/
322
323NTSTATUS srv_decrypt_buffer(char *buf)
324{
325 /* Ignore non-session messages. */
326 if(CVAL(buf,0)) {
327 return NT_STATUS_OK;
328 }
329
330 if (srv_trans_enc_ctx) {
331 return common_decrypt_buffer(srv_trans_enc_ctx->es, buf);
332 }
333
334 return NT_STATUS_OK;
335}
336
337/******************************************************************************
338 Encrypt an outgoing buffer. Return the encrypted pointer in buf_out.
339******************************************************************************/
340
341NTSTATUS srv_encrypt_buffer(char *buf, char **buf_out)
342{
343 *buf_out = buf;
344
345 /* Ignore non-session messages. */
346 if(CVAL(buf,0)) {
347 return NT_STATUS_OK;
348 }
349
350 if (srv_trans_enc_ctx) {
351 return common_encrypt_buffer(srv_trans_enc_ctx->es, buf, buf_out);
352 }
353 /* Not encrypting. */
354 return NT_STATUS_OK;
355}
356
357/******************************************************************************
358 Do the gss encryption negotiation. Parameters are in/out.
359 Until success we do everything on the partial enc ctx.
360******************************************************************************/
361
362#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
363static NTSTATUS srv_enc_spnego_gss_negotiate(unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob)
364{
365 OM_uint32 ret;
366 OM_uint32 min;
367 OM_uint32 flags = 0;
368 gss_buffer_desc in_buf, out_buf;
369 struct smb_tran_enc_state_gss *gss_state;
370 DATA_BLOB auth_reply = data_blob_null;
371 DATA_BLOB response = data_blob_null;
372 NTSTATUS status;
373
374 if (!partial_srv_trans_enc_ctx) {
375 status = make_srv_encryption_context(SMB_TRANS_ENC_GSS, &partial_srv_trans_enc_ctx);
376 if (!NT_STATUS_IS_OK(status)) {
377 return status;
378 }
379 }
380
381 gss_state = partial_srv_trans_enc_ctx->es->s.gss_state;
382
383 in_buf.value = secblob.data;
384 in_buf.length = secblob.length;
385
386 out_buf.value = NULL;
387 out_buf.length = 0;
388
389 become_root();
390
391 ret = gss_accept_sec_context(&min,
392 &gss_state->gss_ctx,
393 gss_state->creds,
394 &in_buf,
395 GSS_C_NO_CHANNEL_BINDINGS,
396 NULL,
397 NULL, /* Ignore oids. */
398 &out_buf, /* To return. */
399 &flags,
400 NULL, /* Ingore time. */
401 NULL); /* Ignore delegated creds. */
402 unbecome_root();
403
404 status = gss_err_to_ntstatus(ret, min);
405 if (ret != GSS_S_COMPLETE && ret != GSS_S_CONTINUE_NEEDED) {
406 return status;
407 }
408
409 /* Ensure we've got sign+seal available. */
410 if (ret == GSS_S_COMPLETE) {
411 if ((flags & (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) !=
412 (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) {
413 DEBUG(0,("srv_enc_spnego_gss_negotiate: quality of service not good enough "
414 "for SMB sealing.\n"));
415 gss_release_buffer(&min, &out_buf);
416 return NT_STATUS_ACCESS_DENIED;
417 }
418 }
419
420 auth_reply = data_blob(out_buf.value, out_buf.length);
421 gss_release_buffer(&min, &out_buf);
422
423 /* Wrap in SPNEGO. */
424 response = spnego_gen_auth_response(&auth_reply, status, OID_KERBEROS5);
425 data_blob_free(&auth_reply);
426
427 SAFE_FREE(*ppdata);
428 *ppdata = response.data;
429 *p_data_size = response.length;
430
431 return status;
432}
433#endif
434
435/******************************************************************************
436 Do the NTLM SPNEGO (or raw) encryption negotiation. Parameters are in/out.
437 Until success we do everything on the partial enc ctx.
438******************************************************************************/
439
440static NTSTATUS srv_enc_ntlm_negotiate(unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob, bool spnego_wrap)
441{
442 NTSTATUS status;
443 DATA_BLOB chal = data_blob_null;
444 DATA_BLOB response = data_blob_null;
445
446 status = make_srv_encryption_context(SMB_TRANS_ENC_NTLM, &partial_srv_trans_enc_ctx);
447 if (!NT_STATUS_IS_OK(status)) {
448 return status;
449 }
450
451 status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, secblob, &chal);
452
453 /* status here should be NT_STATUS_MORE_PROCESSING_REQUIRED
454 * for success ... */
455
456 if (spnego_wrap) {
457 response = spnego_gen_auth_response(&chal, status, OID_NTLMSSP);
458 data_blob_free(&chal);
459 } else {
460 /* Return the raw blob. */
461 response = chal;
462 }
463
464 SAFE_FREE(*ppdata);
465 *ppdata = response.data;
466 *p_data_size = response.length;
467 return status;
468}
469
470/******************************************************************************
471 Do the SPNEGO encryption negotiation. Parameters are in/out.
472 Based off code in smbd/sesssionsetup.c
473 Until success we do everything on the partial enc ctx.
474******************************************************************************/
475
476static NTSTATUS srv_enc_spnego_negotiate(connection_struct *conn,
477 unsigned char **ppdata,
478 size_t *p_data_size,
479 unsigned char **pparam,
480 size_t *p_param_size)
481{
482 NTSTATUS status;
483 DATA_BLOB blob = data_blob_null;
484 DATA_BLOB secblob = data_blob_null;
485 char *kerb_mech = NULL;
486
487 blob = data_blob_const(*ppdata, *p_data_size);
488
489 status = parse_spnego_mechanisms(blob, &secblob, &kerb_mech);
490 if (!NT_STATUS_IS_OK(status)) {
491 return nt_status_squash(status);
492 }
493
494 /* We should have no partial context at this point. */
495
496 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
497
498 if (kerb_mech) {
499 SAFE_FREE(kerb_mech);
500
501#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
502 status = srv_enc_spnego_gss_negotiate(ppdata, p_data_size, secblob);
503#else
504 /* Currently we don't SPNEGO negotiate
505 * back to NTLMSSP as we do in sessionsetupX. We should... */
506 return NT_STATUS_LOGON_FAILURE;
507#endif
508 } else {
509 status = srv_enc_ntlm_negotiate(ppdata, p_data_size, secblob, true);
510 }
511
512 data_blob_free(&secblob);
513
514 if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
515 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
516 return nt_status_squash(status);
517 }
518
519 if (NT_STATUS_IS_OK(status)) {
520 /* Return the context we're using for this encryption state. */
521 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
522 return NT_STATUS_NO_MEMORY;
523 }
524 SSVAL(*pparam,0,partial_srv_trans_enc_ctx->es->enc_ctx_num);
525 *p_param_size = 2;
526 }
527
528 return status;
529}
530
531/******************************************************************************
532 Complete a SPNEGO encryption negotiation. Parameters are in/out.
533 We only get this for a NTLM auth second stage.
534******************************************************************************/
535
536static NTSTATUS srv_enc_spnego_ntlm_auth(connection_struct *conn,
537 unsigned char **ppdata,
538 size_t *p_data_size,
539 unsigned char **pparam,
540 size_t *p_param_size)
541{
542 NTSTATUS status;
543 DATA_BLOB blob = data_blob_null;
544 DATA_BLOB auth = data_blob_null;
545 DATA_BLOB auth_reply = data_blob_null;
546 DATA_BLOB response = data_blob_null;
547 struct smb_srv_trans_enc_ctx *ec = partial_srv_trans_enc_ctx;
548
549 /* We must have a partial context here. */
550
551 if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
552 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
553 return NT_STATUS_INVALID_PARAMETER;
554 }
555
556 blob = data_blob_const(*ppdata, *p_data_size);
557 if (!spnego_parse_auth(blob, &auth)) {
558 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
559 return NT_STATUS_INVALID_PARAMETER;
560 }
561
562 status = auth_ntlmssp_update(ec->auth_ntlmssp_state, auth, &auth_reply);
563 data_blob_free(&auth);
564
565 /* From RFC4178.
566 *
567 * supportedMech
568 *
569 * This field SHALL only be present in the first reply from the
570 * target.
571 * So set mechOID to NULL here.
572 */
573
574 response = spnego_gen_auth_response(&auth_reply, status, NULL);
575 data_blob_free(&auth_reply);
576
577 if (NT_STATUS_IS_OK(status)) {
578 /* Return the context we're using for this encryption state. */
579 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
580 return NT_STATUS_NO_MEMORY;
581 }
582 SSVAL(*pparam,0,ec->es->enc_ctx_num);
583 *p_param_size = 2;
584 }
585
586 SAFE_FREE(*ppdata);
587 *ppdata = response.data;
588 *p_data_size = response.length;
589 return status;
590}
591
592/******************************************************************************
593 Raw NTLM encryption negotiation. Parameters are in/out.
594 This function does both steps.
595******************************************************************************/
596
597static NTSTATUS srv_enc_raw_ntlm_auth(connection_struct *conn,
598 unsigned char **ppdata,
599 size_t *p_data_size,
600 unsigned char **pparam,
601 size_t *p_param_size)
602{
603 NTSTATUS status;
604 DATA_BLOB blob = data_blob_const(*ppdata, *p_data_size);
605 DATA_BLOB response = data_blob_null;
606 struct smb_srv_trans_enc_ctx *ec;
607
608 if (!partial_srv_trans_enc_ctx) {
609 /* This is the initial step. */
610 status = srv_enc_ntlm_negotiate(ppdata, p_data_size, blob, false);
611 if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
612 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
613 return nt_status_squash(status);
614 }
615 return status;
616 }
617
618 ec = partial_srv_trans_enc_ctx;
619 if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
620 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
621 return NT_STATUS_INVALID_PARAMETER;
622 }
623
624 /* Second step. */
625 status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, blob, &response);
626
627 if (NT_STATUS_IS_OK(status)) {
628 /* Return the context we're using for this encryption state. */
629 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
630 return NT_STATUS_NO_MEMORY;
631 }
632 SSVAL(*pparam,0,ec->es->enc_ctx_num);
633 *p_param_size = 2;
634 }
635
636 /* Return the raw blob. */
637 SAFE_FREE(*ppdata);
638 *ppdata = response.data;
639 *p_data_size = response.length;
640 return status;
641}
642
643/******************************************************************************
644 Do the SPNEGO encryption negotiation. Parameters are in/out.
645******************************************************************************/
646
647NTSTATUS srv_request_encryption_setup(connection_struct *conn,
648 unsigned char **ppdata,
649 size_t *p_data_size,
650 unsigned char **pparam,
651 size_t *p_param_size)
652{
653 unsigned char *pdata = *ppdata;
654
655 SAFE_FREE(*pparam);
656 *p_param_size = 0;
657
658 if (*p_data_size < 1) {
659 return NT_STATUS_INVALID_PARAMETER;
660 }
661
662 if (pdata[0] == ASN1_APPLICATION(0)) {
663 /* its a negTokenTarg packet */
664 return srv_enc_spnego_negotiate(conn, ppdata, p_data_size, pparam, p_param_size);
665 }
666
667 if (pdata[0] == ASN1_CONTEXT(1)) {
668 /* It's an auth packet */
669 return srv_enc_spnego_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
670 }
671
672 /* Maybe it's a raw unwrapped auth ? */
673 if (*p_data_size < 7) {
674 return NT_STATUS_INVALID_PARAMETER;
675 }
676
677 if (strncmp((char *)pdata, "NTLMSSP", 7) == 0) {
678 return srv_enc_raw_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
679 }
680
681 DEBUG(1,("srv_request_encryption_setup: Unknown packet\n"));
682
683 return NT_STATUS_LOGON_FAILURE;
684}
685
686/******************************************************************************
687 Negotiation was successful - turn on server-side encryption.
688******************************************************************************/
689
690static NTSTATUS check_enc_good(struct smb_srv_trans_enc_ctx *ec)
691{
692 if (!ec || !ec->es) {
693 return NT_STATUS_LOGON_FAILURE;
694 }
695
696 if (ec->es->smb_enc_type == SMB_TRANS_ENC_NTLM) {
697 if ((ec->es->s.ntlmssp_state->neg_flags & (NTLMSSP_NEGOTIATE_SIGN|NTLMSSP_NEGOTIATE_SEAL)) !=
698 (NTLMSSP_NEGOTIATE_SIGN|NTLMSSP_NEGOTIATE_SEAL)) {
699 return NT_STATUS_INVALID_PARAMETER;
700 }
701 }
702 /* Todo - check gssapi case. */
703
704 return NT_STATUS_OK;
705}
706
707/******************************************************************************
708 Negotiation was successful - turn on server-side encryption.
709******************************************************************************/
710
711NTSTATUS srv_encryption_start(connection_struct *conn)
712{
713 NTSTATUS status;
714
715 /* Check that we are really doing sign+seal. */
716 status = check_enc_good(partial_srv_trans_enc_ctx);
717 if (!NT_STATUS_IS_OK(status)) {
718 return status;
719 }
720 /* Throw away the context we're using currently (if any). */
721 srv_free_encryption_context(&srv_trans_enc_ctx);
722
723 /* Steal the partial pointer. Deliberate shallow copy. */
724 srv_trans_enc_ctx = partial_srv_trans_enc_ctx;
725 srv_trans_enc_ctx->es->enc_on = true;
726
727 partial_srv_trans_enc_ctx = NULL;
728
729 DEBUG(1,("srv_encryption_start: context negotiated\n"));
730 return NT_STATUS_OK;
731}
732
733/******************************************************************************
734 Shutdown all server contexts.
735******************************************************************************/
736
737void server_encryption_shutdown(void)
738{
739 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
740 srv_free_encryption_context(&srv_trans_enc_ctx);
741}
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