source: branches/samba-3.2.x/source/smbd/seal.c@ 621

Last change on this file since 621 was 133, checked in by Paul Smedley, 17 years ago

Update trunk to 3.2.0pre3
File size: 21.1 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 asprintf(&host_princ_s, "%s@%s", service, name);
132 if (host_princ_s == NULL) {
133 return NT_STATUS_NO_MEMORY;
134 }
135
136 input_name.value = host_princ_s;
137 input_name.length = strlen(host_princ_s) + 1;
138
139 ret = gss_import_name(&min,
140 &input_name,
141 &nt_hostbased_service,
142 &srv_name);
143
144 DEBUG(10,("get_srv_gss_creds: imported name %s\n",
145 host_princ_s ));
146
147 if (ret != GSS_S_COMPLETE) {
148 SAFE_FREE(host_princ_s);
149 return map_nt_error_from_gss(ret, min);
150 }
151
152 /*
153 * We're accessing the krb5.keytab file here.
154 * ensure we have permissions to do so.
155 */
156 become_root();
157
158 ret = gss_acquire_cred(&min,
159 srv_name,
160 GSS_C_INDEFINITE,
161 GSS_C_NULL_OID_SET,
162 cred_type,
163 p_srv_cred,
164 NULL,
165 NULL);
166 unbecome_root();
167
168 if (ret != GSS_S_COMPLETE) {
169 ADS_STATUS adss = ADS_ERROR_GSS(ret, min);
170 DEBUG(10,("get_srv_gss_creds: gss_acquire_cred failed with %s\n",
171 ads_errstr(adss)));
172 status = map_nt_error_from_gss(ret, min);
173 }
174
175 SAFE_FREE(host_princ_s);
176 gss_release_name(&min, &srv_name);
177 return status;
178}
179
180/******************************************************************************
181 Create a gss state.
182 Try and get the cifs/server@realm principal first, then fall back to
183 host/server@realm.
184******************************************************************************/
185
186static NTSTATUS make_auth_gss(struct smb_srv_trans_enc_ctx *ec)
187{
188 NTSTATUS status;
189 gss_cred_id_t srv_cred;
190 fstring fqdn;
191
192 name_to_fqdn(fqdn, global_myname());
193 strlower_m(fqdn);
194
195 status = get_srv_gss_creds("cifs", fqdn, GSS_C_ACCEPT, &srv_cred);
196 if (!NT_STATUS_IS_OK(status)) {
197 status = get_srv_gss_creds("host", fqdn, GSS_C_ACCEPT, &srv_cred);
198 if (!NT_STATUS_IS_OK(status)) {
199 return nt_status_squash(status);
200 }
201 }
202
203 ec->es->s.gss_state = SMB_MALLOC_P(struct smb_tran_enc_state_gss);
204 if (!ec->es->s.gss_state) {
205 OM_uint32 min;
206 gss_release_cred(&min, &srv_cred);
207 return NT_STATUS_NO_MEMORY;
208 }
209 ZERO_STRUCTP(ec->es->s.gss_state);
210 ec->es->s.gss_state->creds = srv_cred;
211
212 /* No context yet. */
213 ec->es->s.gss_state->gss_ctx = GSS_C_NO_CONTEXT;
214
215 return NT_STATUS_OK;
216}
217#endif
218
219/******************************************************************************
220 Shutdown a server encryption context.
221******************************************************************************/
222
223static void srv_free_encryption_context(struct smb_srv_trans_enc_ctx **pp_ec)
224{
225 struct smb_srv_trans_enc_ctx *ec = *pp_ec;
226
227 if (!ec) {
228 return;
229 }
230
231 if (ec->es) {
232 switch (ec->es->smb_enc_type) {
233 case SMB_TRANS_ENC_NTLM:
234 destroy_auth_ntlmssp(ec);
235 break;
236#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
237 case SMB_TRANS_ENC_GSS:
238 break;
239#endif
240 }
241 common_free_encryption_state(&ec->es);
242 }
243
244 SAFE_FREE(ec);
245 *pp_ec = NULL;
246}
247
248/******************************************************************************
249 Create a server encryption context.
250******************************************************************************/
251
252static NTSTATUS make_srv_encryption_context(enum smb_trans_enc_type smb_enc_type, struct smb_srv_trans_enc_ctx **pp_ec)
253{
254 struct smb_srv_trans_enc_ctx *ec;
255
256 *pp_ec = NULL;
257
258 ec = SMB_MALLOC_P(struct smb_srv_trans_enc_ctx);
259 if (!ec) {
260 return NT_STATUS_NO_MEMORY;
261 }
262 ZERO_STRUCTP(partial_srv_trans_enc_ctx);
263 ec->es = SMB_MALLOC_P(struct smb_trans_enc_state);
264 if (!ec->es) {
265 SAFE_FREE(ec);
266 return NT_STATUS_NO_MEMORY;
267 }
268 ZERO_STRUCTP(ec->es);
269 ec->es->smb_enc_type = smb_enc_type;
270 switch (smb_enc_type) {
271 case SMB_TRANS_ENC_NTLM:
272 {
273 NTSTATUS status = make_auth_ntlmssp(ec);
274 if (!NT_STATUS_IS_OK(status)) {
275 srv_free_encryption_context(&ec);
276 return status;
277 }
278 }
279 break;
280
281#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
282 case SMB_TRANS_ENC_GSS:
283 /* Acquire our credentials by calling gss_acquire_cred here. */
284 {
285 NTSTATUS status = make_auth_gss(ec);
286 if (!NT_STATUS_IS_OK(status)) {
287 srv_free_encryption_context(&ec);
288 return status;
289 }
290 }
291 break;
292#endif
293 default:
294 srv_free_encryption_context(&ec);
295 return NT_STATUS_INVALID_PARAMETER;
296 }
297 *pp_ec = ec;
298 return NT_STATUS_OK;
299}
300
301/******************************************************************************
302 Free an encryption-allocated buffer.
303******************************************************************************/
304
305void srv_free_enc_buffer(char *buf)
306{
307 /* We know this is an smb buffer, and we
308 * didn't malloc, only copy, for a keepalive,
309 * so ignore non-session messages. */
310
311 if(CVAL(buf,0)) {
312 return;
313 }
314
315 if (srv_trans_enc_ctx) {
316 common_free_enc_buffer(srv_trans_enc_ctx->es, buf);
317 }
318}
319
320/******************************************************************************
321 Decrypt an incoming buffer.
322******************************************************************************/
323
324NTSTATUS srv_decrypt_buffer(char *buf)
325{
326 /* Ignore non-session messages. */
327 if(CVAL(buf,0)) {
328 return NT_STATUS_OK;
329 }
330
331 if (srv_trans_enc_ctx) {
332 return common_decrypt_buffer(srv_trans_enc_ctx->es, buf);
333 }
334
335 return NT_STATUS_OK;
336}
337
338/******************************************************************************
339 Encrypt an outgoing buffer. Return the encrypted pointer in buf_out.
340******************************************************************************/
341
342NTSTATUS srv_encrypt_buffer(char *buf, char **buf_out)
343{
344 *buf_out = buf;
345
346 /* Ignore non-session messages. */
347 if(CVAL(buf,0)) {
348 return NT_STATUS_OK;
349 }
350
351 if (srv_trans_enc_ctx) {
352 return common_encrypt_buffer(srv_trans_enc_ctx->es, buf, buf_out);
353 }
354 /* Not encrypting. */
355 return NT_STATUS_OK;
356}
357
358/******************************************************************************
359 Do the gss encryption negotiation. Parameters are in/out.
360 Until success we do everything on the partial enc ctx.
361******************************************************************************/
362
363#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
364static NTSTATUS srv_enc_spnego_gss_negotiate(unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob)
365{
366 OM_uint32 ret;
367 OM_uint32 min;
368 OM_uint32 flags = 0;
369 gss_buffer_desc in_buf, out_buf;
370 struct smb_tran_enc_state_gss *gss_state;
371 DATA_BLOB auth_reply = data_blob_null;
372 DATA_BLOB response = data_blob_null;
373 NTSTATUS status;
374
375 if (!partial_srv_trans_enc_ctx) {
376 status = make_srv_encryption_context(SMB_TRANS_ENC_GSS, &partial_srv_trans_enc_ctx);
377 if (!NT_STATUS_IS_OK(status)) {
378 return status;
379 }
380 }
381
382 gss_state = partial_srv_trans_enc_ctx->es->s.gss_state;
383
384 in_buf.value = secblob.data;
385 in_buf.length = secblob.length;
386
387 out_buf.value = NULL;
388 out_buf.length = 0;
389
390 become_root();
391
392 ret = gss_accept_sec_context(&min,
393 &gss_state->gss_ctx,
394 gss_state->creds,
395 &in_buf,
396 GSS_C_NO_CHANNEL_BINDINGS,
397 NULL,
398 NULL, /* Ignore oids. */
399 &out_buf, /* To return. */
400 &flags,
401 NULL, /* Ingore time. */
402 NULL); /* Ignore delegated creds. */
403 unbecome_root();
404
405 status = gss_err_to_ntstatus(ret, min);
406 if (ret != GSS_S_COMPLETE && ret != GSS_S_CONTINUE_NEEDED) {
407 return status;
408 }
409
410 /* Ensure we've got sign+seal available. */
411 if (ret == GSS_S_COMPLETE) {
412 if ((flags & (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) !=
413 (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) {
414 DEBUG(0,("srv_enc_spnego_gss_negotiate: quality of service not good enough "
415 "for SMB sealing.\n"));
416 gss_release_buffer(&min, &out_buf);
417 return NT_STATUS_ACCESS_DENIED;
418 }
419 }
420
421 auth_reply = data_blob(out_buf.value, out_buf.length);
422 gss_release_buffer(&min, &out_buf);
423
424 /* Wrap in SPNEGO. */
425 response = spnego_gen_auth_response(&auth_reply, status, OID_KERBEROS5);
426 data_blob_free(&auth_reply);
427
428 SAFE_FREE(*ppdata);
429 *ppdata = response.data;
430 *p_data_size = response.length;
431
432 return status;
433}
434#endif
435
436/******************************************************************************
437 Do the NTLM SPNEGO (or raw) encryption negotiation. Parameters are in/out.
438 Until success we do everything on the partial enc ctx.
439******************************************************************************/
440
441static NTSTATUS srv_enc_ntlm_negotiate(unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob, bool spnego_wrap)
442{
443 NTSTATUS status;
444 DATA_BLOB chal = data_blob_null;
445 DATA_BLOB response = data_blob_null;
446
447 status = make_srv_encryption_context(SMB_TRANS_ENC_NTLM, &partial_srv_trans_enc_ctx);
448 if (!NT_STATUS_IS_OK(status)) {
449 return status;
450 }
451
452 status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, secblob, &chal);
453
454 /* status here should be NT_STATUS_MORE_PROCESSING_REQUIRED
455 * for success ... */
456
457 if (spnego_wrap) {
458 response = spnego_gen_auth_response(&chal, status, OID_NTLMSSP);
459 data_blob_free(&chal);
460 } else {
461 /* Return the raw blob. */
462 response = chal;
463 }
464
465 SAFE_FREE(*ppdata);
466 *ppdata = response.data;
467 *p_data_size = response.length;
468 return status;
469}
470
471/******************************************************************************
472 Do the SPNEGO encryption negotiation. Parameters are in/out.
473 Based off code in smbd/sesssionsetup.c
474 Until success we do everything on the partial enc ctx.
475******************************************************************************/
476
477static NTSTATUS srv_enc_spnego_negotiate(connection_struct *conn,
478 unsigned char **ppdata,
479 size_t *p_data_size,
480 unsigned char **pparam,
481 size_t *p_param_size)
482{
483 NTSTATUS status;
484 DATA_BLOB blob = data_blob_null;
485 DATA_BLOB secblob = data_blob_null;
486 char *kerb_mech = NULL;
487
488 blob = data_blob_const(*ppdata, *p_data_size);
489
490 status = parse_spnego_mechanisms(blob, &secblob, &kerb_mech);
491 if (!NT_STATUS_IS_OK(status)) {
492 return nt_status_squash(status);
493 }
494
495 /* We should have no partial context at this point. */
496
497 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
498
499 if (kerb_mech) {
500 SAFE_FREE(kerb_mech);
501
502#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
503 status = srv_enc_spnego_gss_negotiate(ppdata, p_data_size, secblob);
504#else
505 /* Currently we don't SPNEGO negotiate
506 * back to NTLMSSP as we do in sessionsetupX. We should... */
507 return NT_STATUS_LOGON_FAILURE;
508#endif
509 } else {
510 status = srv_enc_ntlm_negotiate(ppdata, p_data_size, secblob, true);
511 }
512
513 data_blob_free(&secblob);
514
515 if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
516 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
517 return nt_status_squash(status);
518 }
519
520 if (NT_STATUS_IS_OK(status)) {
521 /* Return the context we're using for this encryption state. */
522 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
523 return NT_STATUS_NO_MEMORY;
524 }
525 SSVAL(*pparam,0,partial_srv_trans_enc_ctx->es->enc_ctx_num);
526 *p_param_size = 2;
527 }
528
529 return status;
530}
531
532/******************************************************************************
533 Complete a SPNEGO encryption negotiation. Parameters are in/out.
534 We only get this for a NTLM auth second stage.
535******************************************************************************/
536
537static NTSTATUS srv_enc_spnego_ntlm_auth(connection_struct *conn,
538 unsigned char **ppdata,
539 size_t *p_data_size,
540 unsigned char **pparam,
541 size_t *p_param_size)
542{
543 NTSTATUS status;
544 DATA_BLOB blob = data_blob_null;
545 DATA_BLOB auth = data_blob_null;
546 DATA_BLOB auth_reply = data_blob_null;
547 DATA_BLOB response = data_blob_null;
548 struct smb_srv_trans_enc_ctx *ec = partial_srv_trans_enc_ctx;
549
550 /* We must have a partial context here. */
551
552 if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
553 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
554 return NT_STATUS_INVALID_PARAMETER;
555 }
556
557 blob = data_blob_const(*ppdata, *p_data_size);
558 if (!spnego_parse_auth(blob, &auth)) {
559 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
560 return NT_STATUS_INVALID_PARAMETER;
561 }
562
563 status = auth_ntlmssp_update(ec->auth_ntlmssp_state, auth, &auth_reply);
564 data_blob_free(&auth);
565
566 /* From RFC4178.
567 *
568 * supportedMech
569 *
570 * This field SHALL only be present in the first reply from the
571 * target.
572 * So set mechOID to NULL here.
573 */
574
575 response = spnego_gen_auth_response(&auth_reply, status, NULL);
576 data_blob_free(&auth_reply);
577
578 if (NT_STATUS_IS_OK(status)) {
579 /* Return the context we're using for this encryption state. */
580 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
581 return NT_STATUS_NO_MEMORY;
582 }
583 SSVAL(*pparam,0,ec->es->enc_ctx_num);
584 *p_param_size = 2;
585 }
586
587 SAFE_FREE(*ppdata);
588 *ppdata = response.data;
589 *p_data_size = response.length;
590 return status;
591}
592
593/******************************************************************************
594 Raw NTLM encryption negotiation. Parameters are in/out.
595 This function does both steps.
596******************************************************************************/
597
598static NTSTATUS srv_enc_raw_ntlm_auth(connection_struct *conn,
599 unsigned char **ppdata,
600 size_t *p_data_size,
601 unsigned char **pparam,
602 size_t *p_param_size)
603{
604 NTSTATUS status;
605 DATA_BLOB blob = data_blob_const(*ppdata, *p_data_size);
606 DATA_BLOB response = data_blob_null;
607 struct smb_srv_trans_enc_ctx *ec;
608
609 if (!partial_srv_trans_enc_ctx) {
610 /* This is the initial step. */
611 status = srv_enc_ntlm_negotiate(ppdata, p_data_size, blob, false);
612 if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
613 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
614 return nt_status_squash(status);
615 }
616 return status;
617 }
618
619 ec = partial_srv_trans_enc_ctx;
620 if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
621 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
622 return NT_STATUS_INVALID_PARAMETER;
623 }
624
625 /* Second step. */
626 status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, blob, &response);
627
628 if (NT_STATUS_IS_OK(status)) {
629 /* Return the context we're using for this encryption state. */
630 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
631 return NT_STATUS_NO_MEMORY;
632 }
633 SSVAL(*pparam,0,ec->es->enc_ctx_num);
634 *p_param_size = 2;
635 }
636
637 /* Return the raw blob. */
638 SAFE_FREE(*ppdata);
639 *ppdata = response.data;
640 *p_data_size = response.length;
641 return status;
642}
643
644/******************************************************************************
645 Do the SPNEGO encryption negotiation. Parameters are in/out.
646******************************************************************************/
647
648NTSTATUS srv_request_encryption_setup(connection_struct *conn,
649 unsigned char **ppdata,
650 size_t *p_data_size,
651 unsigned char **pparam,
652 size_t *p_param_size)
653{
654 unsigned char *pdata = *ppdata;
655
656 SAFE_FREE(*pparam);
657 *p_param_size = 0;
658
659 if (*p_data_size < 1) {
660 return NT_STATUS_INVALID_PARAMETER;
661 }
662
663 if (pdata[0] == ASN1_APPLICATION(0)) {
664 /* its a negTokenTarg packet */
665 return srv_enc_spnego_negotiate(conn, ppdata, p_data_size, pparam, p_param_size);
666 }
667
668 if (pdata[0] == ASN1_CONTEXT(1)) {
669 /* It's an auth packet */
670 return srv_enc_spnego_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
671 }
672
673 /* Maybe it's a raw unwrapped auth ? */
674 if (*p_data_size < 7) {
675 return NT_STATUS_INVALID_PARAMETER;
676 }
677
678 if (strncmp((char *)pdata, "NTLMSSP", 7) == 0) {
679 return srv_enc_raw_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
680 }
681
682 DEBUG(1,("srv_request_encryption_setup: Unknown packet\n"));
683
684 return NT_STATUS_LOGON_FAILURE;
685}
686
687/******************************************************************************
688 Negotiation was successful - turn on server-side encryption.
689******************************************************************************/
690
691static NTSTATUS check_enc_good(struct smb_srv_trans_enc_ctx *ec)
692{
693 if (!ec || !ec->es) {
694 return NT_STATUS_LOGON_FAILURE;
695 }
696
697 if (ec->es->smb_enc_type == SMB_TRANS_ENC_NTLM) {
698 if ((ec->es->s.ntlmssp_state->neg_flags & (NTLMSSP_NEGOTIATE_SIGN|NTLMSSP_NEGOTIATE_SEAL)) !=
699 (NTLMSSP_NEGOTIATE_SIGN|NTLMSSP_NEGOTIATE_SEAL)) {
700 return NT_STATUS_INVALID_PARAMETER;
701 }
702 }
703 /* Todo - check gssapi case. */
704
705 return NT_STATUS_OK;
706}
707
708/******************************************************************************
709 Negotiation was successful - turn on server-side encryption.
710******************************************************************************/
711
712NTSTATUS srv_encryption_start(connection_struct *conn)
713{
714 NTSTATUS status;
715
716 /* Check that we are really doing sign+seal. */
717 status = check_enc_good(partial_srv_trans_enc_ctx);
718 if (!NT_STATUS_IS_OK(status)) {
719 return status;
720 }
721 /* Throw away the context we're using currently (if any). */
722 srv_free_encryption_context(&srv_trans_enc_ctx);
723
724 /* Steal the partial pointer. Deliberate shallow copy. */
725 srv_trans_enc_ctx = partial_srv_trans_enc_ctx;
726 srv_trans_enc_ctx->es->enc_on = true;
727
728 partial_srv_trans_enc_ctx = NULL;
729
730 DEBUG(1,("srv_encryption_start: context negotiated\n"));
731 return NT_STATUS_OK;
732}
733
734/******************************************************************************
735 Shutdown all server contexts.
736******************************************************************************/
737
738void server_encryption_shutdown(void)
739{
740 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
741 srv_free_encryption_context(&srv_trans_enc_ctx);
742}
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