source: trunk/server/source3/smbd/seal.c@ 832

Last change on this file since 832 was 745, checked in by Silvan Scherrer, 13 years ago

Samba Server: updated trunk to 3.6.0
File size: 22.6 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#include "smbd/smbd.h"
22#include "smbd/globals.h"
23#include "../libcli/auth/spnego.h"
24#include "../libcli/auth/ntlmssp.h"
25#include "ntlmssp_wrap.h"
26#include "smb_crypt.h"
27#include "../lib/util/asn1.h"
28#include "auth.h"
29#include "libsmb/libsmb.h"
30
31/******************************************************************************
32 Server side encryption.
33******************************************************************************/
34
35/******************************************************************************
36 Global server state.
37******************************************************************************/
38
39struct smb_srv_trans_enc_ctx {
40 struct smb_trans_enc_state *es;
41 struct auth_ntlmssp_state *auth_ntlmssp_state; /* Must be kept in sync with pointer in ec->ntlmssp_state. */
42};
43
44/******************************************************************************
45 Return global enc context - this must change if we ever do multiple contexts.
46******************************************************************************/
47
48uint16_t srv_enc_ctx(void)
49{
50 return srv_trans_enc_ctx->es->enc_ctx_num;
51}
52
53/******************************************************************************
54 Is this an incoming encrypted packet ?
55******************************************************************************/
56
57bool is_encrypted_packet(const uint8_t *inbuf)
58{
59 NTSTATUS status;
60 uint16_t enc_num;
61
62 /* Ignore non-session messages or non 0xFF'E' messages. */
63 if(CVAL(inbuf,0)
64 || (smb_len(inbuf) < 8)
65 || !(inbuf[4] == 0xFF && inbuf[5] == 'E')) {
66 return false;
67 }
68
69 status = get_enc_ctx_num(inbuf, &enc_num);
70 if (!NT_STATUS_IS_OK(status)) {
71 return false;
72 }
73
74 /* Encrypted messages are 0xFF'E'<ctx> */
75 if (srv_trans_enc_ctx && enc_num == srv_enc_ctx()) {
76 return true;
77 }
78 return false;
79}
80
81/******************************************************************************
82 Create an auth_ntlmssp_state and ensure pointer copy is correct.
83******************************************************************************/
84
85static NTSTATUS make_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
86{
87 NTSTATUS status = auth_ntlmssp_start(&ec->auth_ntlmssp_state);
88 if (!NT_STATUS_IS_OK(status)) {
89 return nt_status_squash(status);
90 }
91
92 /*
93 * We must remember to update the pointer copy for the common
94 * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
95 */
96 ec->es->s.ntlmssp_state = auth_ntlmssp_get_ntlmssp_state(ec->auth_ntlmssp_state);
97 return status;
98}
99
100/******************************************************************************
101 Destroy an auth_ntlmssp_state and ensure pointer copy is correct.
102******************************************************************************/
103
104static void destroy_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
105{
106 /*
107 * We must remember to update the pointer copy for the common
108 * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
109 */
110
111 if (ec->auth_ntlmssp_state) {
112 TALLOC_FREE(ec->auth_ntlmssp_state);
113 /* The auth_ntlmssp_end killed this already. */
114 ec->es->s.ntlmssp_state = NULL;
115 }
116}
117
118#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
119
120/******************************************************************************
121 Import a name.
122******************************************************************************/
123
124static NTSTATUS get_srv_gss_creds(const char *service,
125 const char *name,
126 gss_cred_usage_t cred_type,
127 gss_cred_id_t *p_srv_cred)
128{
129 OM_uint32 ret;
130 OM_uint32 min;
131 gss_name_t srv_name;
132 gss_buffer_desc input_name;
133 char *host_princ_s = NULL;
134 NTSTATUS status = NT_STATUS_OK;
135
136 gss_OID_desc nt_hostbased_service =
137 {10, CONST_DISCARD(char *,"\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x04")};
138
139 if (asprintf(&host_princ_s, "%s@%s", service, name) == -1) {
140 return NT_STATUS_NO_MEMORY;
141 }
142
143 input_name.value = host_princ_s;
144 input_name.length = strlen(host_princ_s) + 1;
145
146 ret = gss_import_name(&min,
147 &input_name,
148 &nt_hostbased_service,
149 &srv_name);
150
151 DEBUG(10,("get_srv_gss_creds: imported name %s\n",
152 host_princ_s ));
153
154 if (ret != GSS_S_COMPLETE) {
155 SAFE_FREE(host_princ_s);
156 return map_nt_error_from_gss(ret, min);
157 }
158
159 /*
160 * We're accessing the krb5.keytab file here.
161 * ensure we have permissions to do so.
162 */
163 become_root();
164
165 ret = gss_acquire_cred(&min,
166 srv_name,
167 GSS_C_INDEFINITE,
168 GSS_C_NULL_OID_SET,
169 cred_type,
170 p_srv_cred,
171 NULL,
172 NULL);
173 unbecome_root();
174
175 if (ret != GSS_S_COMPLETE) {
176 ADS_STATUS adss = ADS_ERROR_GSS(ret, min);
177 DEBUG(10,("get_srv_gss_creds: gss_acquire_cred failed with %s\n",
178 ads_errstr(adss)));
179 status = map_nt_error_from_gss(ret, min);
180 }
181
182 SAFE_FREE(host_princ_s);
183 gss_release_name(&min, &srv_name);
184 return status;
185}
186
187/******************************************************************************
188 Create a gss state.
189 Try and get the cifs/server@realm principal first, then fall back to
190 host/server@realm.
191******************************************************************************/
192
193static NTSTATUS make_auth_gss(struct smb_srv_trans_enc_ctx *ec)
194{
195 NTSTATUS status;
196 gss_cred_id_t srv_cred;
197 fstring fqdn;
198
199 name_to_fqdn(fqdn, global_myname());
200 strlower_m(fqdn);
201
202 status = get_srv_gss_creds("cifs", fqdn, GSS_C_ACCEPT, &srv_cred);
203 if (!NT_STATUS_IS_OK(status)) {
204 status = get_srv_gss_creds("host", fqdn, GSS_C_ACCEPT, &srv_cred);
205 if (!NT_STATUS_IS_OK(status)) {
206 return nt_status_squash(status);
207 }
208 }
209
210 ec->es->s.gss_state = SMB_MALLOC_P(struct smb_tran_enc_state_gss);
211 if (!ec->es->s.gss_state) {
212 OM_uint32 min;
213 gss_release_cred(&min, &srv_cred);
214 return NT_STATUS_NO_MEMORY;
215 }
216 ZERO_STRUCTP(ec->es->s.gss_state);
217 ec->es->s.gss_state->creds = srv_cred;
218
219 /* No context yet. */
220 ec->es->s.gss_state->gss_ctx = GSS_C_NO_CONTEXT;
221
222 return NT_STATUS_OK;
223}
224#endif
225
226/******************************************************************************
227 Shutdown a server encryption context.
228******************************************************************************/
229
230static void srv_free_encryption_context(struct smb_srv_trans_enc_ctx **pp_ec)
231{
232 struct smb_srv_trans_enc_ctx *ec = *pp_ec;
233
234 if (!ec) {
235 return;
236 }
237
238 if (ec->es) {
239 switch (ec->es->smb_enc_type) {
240 case SMB_TRANS_ENC_NTLM:
241 destroy_auth_ntlmssp(ec);
242 break;
243#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
244 case SMB_TRANS_ENC_GSS:
245 break;
246#endif
247 }
248 common_free_encryption_state(&ec->es);
249 }
250
251 SAFE_FREE(ec);
252 *pp_ec = NULL;
253}
254
255/******************************************************************************
256 Create a server encryption context.
257******************************************************************************/
258
259static NTSTATUS make_srv_encryption_context(enum smb_trans_enc_type smb_enc_type, struct smb_srv_trans_enc_ctx **pp_ec)
260{
261 struct smb_srv_trans_enc_ctx *ec;
262
263 *pp_ec = NULL;
264
265 ec = SMB_MALLOC_P(struct smb_srv_trans_enc_ctx);
266 if (!ec) {
267 return NT_STATUS_NO_MEMORY;
268 }
269 ZERO_STRUCTP(partial_srv_trans_enc_ctx);
270 ec->es = SMB_MALLOC_P(struct smb_trans_enc_state);
271 if (!ec->es) {
272 SAFE_FREE(ec);
273 return NT_STATUS_NO_MEMORY;
274 }
275 ZERO_STRUCTP(ec->es);
276 ec->es->smb_enc_type = smb_enc_type;
277 switch (smb_enc_type) {
278 case SMB_TRANS_ENC_NTLM:
279 {
280 NTSTATUS status = make_auth_ntlmssp(ec);
281 if (!NT_STATUS_IS_OK(status)) {
282 srv_free_encryption_context(&ec);
283 return status;
284 }
285 }
286 break;
287
288#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
289 case SMB_TRANS_ENC_GSS:
290 /* Acquire our credentials by calling gss_acquire_cred here. */
291 {
292 NTSTATUS status = make_auth_gss(ec);
293 if (!NT_STATUS_IS_OK(status)) {
294 srv_free_encryption_context(&ec);
295 return status;
296 }
297 }
298 break;
299#endif
300 default:
301 srv_free_encryption_context(&ec);
302 return NT_STATUS_INVALID_PARAMETER;
303 }
304 *pp_ec = ec;
305 return NT_STATUS_OK;
306}
307
308/******************************************************************************
309 Free an encryption-allocated buffer.
310******************************************************************************/
311
312void srv_free_enc_buffer(char *buf)
313{
314 /* We know this is an smb buffer, and we
315 * didn't malloc, only copy, for a keepalive,
316 * so ignore non-session messages. */
317
318 if(CVAL(buf,0)) {
319 return;
320 }
321
322 if (srv_trans_enc_ctx) {
323 common_free_enc_buffer(srv_trans_enc_ctx->es, buf);
324 }
325}
326
327/******************************************************************************
328 Decrypt an incoming buffer.
329******************************************************************************/
330
331NTSTATUS srv_decrypt_buffer(char *buf)
332{
333 /* Ignore non-session messages. */
334 if(CVAL(buf,0)) {
335 return NT_STATUS_OK;
336 }
337
338 if (srv_trans_enc_ctx) {
339 return common_decrypt_buffer(srv_trans_enc_ctx->es, buf);
340 }
341
342 return NT_STATUS_OK;
343}
344
345/******************************************************************************
346 Encrypt an outgoing buffer. Return the encrypted pointer in buf_out.
347******************************************************************************/
348
349NTSTATUS srv_encrypt_buffer(char *buf, char **buf_out)
350{
351 *buf_out = buf;
352
353 /* Ignore non-session messages. */
354 if(CVAL(buf,0)) {
355 return NT_STATUS_OK;
356 }
357
358 if (srv_trans_enc_ctx) {
359 return common_encrypt_buffer(srv_trans_enc_ctx->es, buf, buf_out);
360 }
361 /* Not encrypting. */
362 return NT_STATUS_OK;
363}
364
365/******************************************************************************
366 Do the gss encryption negotiation. Parameters are in/out.
367 Until success we do everything on the partial enc ctx.
368******************************************************************************/
369
370#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
371static NTSTATUS srv_enc_spnego_gss_negotiate(unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob)
372{
373 OM_uint32 ret;
374 OM_uint32 min;
375 OM_uint32 flags = 0;
376 gss_buffer_desc in_buf, out_buf;
377 struct smb_tran_enc_state_gss *gss_state;
378 DATA_BLOB auth_reply = data_blob_null;
379 DATA_BLOB response = data_blob_null;
380 NTSTATUS status;
381
382 if (!partial_srv_trans_enc_ctx) {
383 status = make_srv_encryption_context(SMB_TRANS_ENC_GSS, &partial_srv_trans_enc_ctx);
384 if (!NT_STATUS_IS_OK(status)) {
385 return status;
386 }
387 }
388
389 gss_state = partial_srv_trans_enc_ctx->es->s.gss_state;
390
391 in_buf.value = secblob.data;
392 in_buf.length = secblob.length;
393
394 out_buf.value = NULL;
395 out_buf.length = 0;
396
397 become_root();
398
399 ret = gss_accept_sec_context(&min,
400 &gss_state->gss_ctx,
401 gss_state->creds,
402 &in_buf,
403 GSS_C_NO_CHANNEL_BINDINGS,
404 NULL,
405 NULL, /* Ignore oids. */
406 &out_buf, /* To return. */
407 &flags,
408 NULL, /* Ingore time. */
409 NULL); /* Ignore delegated creds. */
410 unbecome_root();
411
412 status = gss_err_to_ntstatus(ret, min);
413 if (ret != GSS_S_COMPLETE && ret != GSS_S_CONTINUE_NEEDED) {
414 return status;
415 }
416
417 /* Ensure we've got sign+seal available. */
418 if (ret == GSS_S_COMPLETE) {
419 if ((flags & (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) !=
420 (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) {
421 DEBUG(0,("srv_enc_spnego_gss_negotiate: quality of service not good enough "
422 "for SMB sealing.\n"));
423 gss_release_buffer(&min, &out_buf);
424 return NT_STATUS_ACCESS_DENIED;
425 }
426 }
427
428 auth_reply = data_blob(out_buf.value, out_buf.length);
429 gss_release_buffer(&min, &out_buf);
430
431 /* Wrap in SPNEGO. */
432 response = spnego_gen_auth_response(talloc_tos(), &auth_reply, status, OID_KERBEROS5);
433 data_blob_free(&auth_reply);
434
435 SAFE_FREE(*ppdata);
436 *ppdata = (unsigned char *)memdup(response.data, response.length);
437 if ((*ppdata) == NULL && response.length > 0) {
438 status = NT_STATUS_NO_MEMORY;
439 }
440 *p_data_size = response.length;
441
442 data_blob_free(&response);
443
444 return status;
445}
446#endif
447
448/******************************************************************************
449 Do the NTLM SPNEGO (or raw) encryption negotiation. Parameters are in/out.
450 Until success we do everything on the partial enc ctx.
451******************************************************************************/
452
453static NTSTATUS srv_enc_ntlm_negotiate(unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob, bool spnego_wrap)
454{
455 NTSTATUS status;
456 DATA_BLOB chal = data_blob_null;
457 DATA_BLOB response = data_blob_null;
458
459 status = make_srv_encryption_context(SMB_TRANS_ENC_NTLM, &partial_srv_trans_enc_ctx);
460 if (!NT_STATUS_IS_OK(status)) {
461 return status;
462 }
463
464 status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, secblob, &chal);
465
466 /* status here should be NT_STATUS_MORE_PROCESSING_REQUIRED
467 * for success ... */
468
469 if (spnego_wrap) {
470 response = spnego_gen_auth_response(talloc_tos(), &chal, status, OID_NTLMSSP);
471 data_blob_free(&chal);
472 } else {
473 /* Return the raw blob. */
474 response = chal;
475 }
476
477 SAFE_FREE(*ppdata);
478 *ppdata = (unsigned char *)memdup(response.data, response.length);
479 if ((*ppdata) == NULL && response.length > 0) {
480 status = NT_STATUS_NO_MEMORY;
481 }
482 *p_data_size = response.length;
483 data_blob_free(&response);
484
485 return status;
486}
487
488/******************************************************************************
489 Do the SPNEGO encryption negotiation. Parameters are in/out.
490 Based off code in smbd/sesssionsetup.c
491 Until success we do everything on the partial enc ctx.
492******************************************************************************/
493
494static NTSTATUS srv_enc_spnego_negotiate(connection_struct *conn,
495 unsigned char **ppdata,
496 size_t *p_data_size,
497 unsigned char **pparam,
498 size_t *p_param_size)
499{
500 NTSTATUS status;
501 DATA_BLOB blob = data_blob_null;
502 DATA_BLOB secblob = data_blob_null;
503 char *kerb_mech = NULL;
504
505 blob = data_blob_const(*ppdata, *p_data_size);
506
507 status = parse_spnego_mechanisms(talloc_tos(), blob, &secblob, &kerb_mech);
508 if (!NT_STATUS_IS_OK(status)) {
509 return nt_status_squash(status);
510 }
511
512 /* We should have no partial context at this point. */
513
514 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
515
516 if (kerb_mech) {
517 TALLOC_FREE(kerb_mech);
518
519#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
520 status = srv_enc_spnego_gss_negotiate(ppdata, p_data_size, secblob);
521#else
522 /* Currently we don't SPNEGO negotiate
523 * back to NTLMSSP as we do in sessionsetupX. We should... */
524 return NT_STATUS_LOGON_FAILURE;
525#endif
526 } else {
527 status = srv_enc_ntlm_negotiate(ppdata, p_data_size, secblob, true);
528 }
529
530 data_blob_free(&secblob);
531
532 if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
533 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
534 return nt_status_squash(status);
535 }
536
537 if (NT_STATUS_IS_OK(status)) {
538 /* Return the context we're using for this encryption state. */
539 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
540 return NT_STATUS_NO_MEMORY;
541 }
542 SSVAL(*pparam,0,partial_srv_trans_enc_ctx->es->enc_ctx_num);
543 *p_param_size = 2;
544 }
545
546 return status;
547}
548
549/******************************************************************************
550 Complete a SPNEGO encryption negotiation. Parameters are in/out.
551 We only get this for a NTLM auth second stage.
552******************************************************************************/
553
554static NTSTATUS srv_enc_spnego_ntlm_auth(connection_struct *conn,
555 unsigned char **ppdata,
556 size_t *p_data_size,
557 unsigned char **pparam,
558 size_t *p_param_size)
559{
560 NTSTATUS status;
561 DATA_BLOB blob = data_blob_null;
562 DATA_BLOB auth = data_blob_null;
563 DATA_BLOB auth_reply = data_blob_null;
564 DATA_BLOB response = data_blob_null;
565 struct smb_srv_trans_enc_ctx *ec = partial_srv_trans_enc_ctx;
566
567 /* We must have a partial context here. */
568
569 if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
570 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
571 return NT_STATUS_INVALID_PARAMETER;
572 }
573
574 blob = data_blob_const(*ppdata, *p_data_size);
575 if (!spnego_parse_auth(talloc_tos(), blob, &auth)) {
576 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
577 return NT_STATUS_INVALID_PARAMETER;
578 }
579
580 status = auth_ntlmssp_update(ec->auth_ntlmssp_state, auth, &auth_reply);
581 data_blob_free(&auth);
582
583 /* From RFC4178.
584 *
585 * supportedMech
586 *
587 * This field SHALL only be present in the first reply from the
588 * target.
589 * So set mechOID to NULL here.
590 */
591
592 response = spnego_gen_auth_response(talloc_tos(), &auth_reply, status, NULL);
593 data_blob_free(&auth_reply);
594
595 if (NT_STATUS_IS_OK(status)) {
596 /* Return the context we're using for this encryption state. */
597 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
598 return NT_STATUS_NO_MEMORY;
599 }
600 SSVAL(*pparam,0,ec->es->enc_ctx_num);
601 *p_param_size = 2;
602 }
603
604 SAFE_FREE(*ppdata);
605 *ppdata = (unsigned char *)memdup(response.data, response.length);
606 if ((*ppdata) == NULL && response.length > 0)
607 return NT_STATUS_NO_MEMORY;
608 *p_data_size = response.length;
609 data_blob_free(&response);
610 return status;
611}
612
613/******************************************************************************
614 Raw NTLM encryption negotiation. Parameters are in/out.
615 This function does both steps.
616******************************************************************************/
617
618static NTSTATUS srv_enc_raw_ntlm_auth(connection_struct *conn,
619 unsigned char **ppdata,
620 size_t *p_data_size,
621 unsigned char **pparam,
622 size_t *p_param_size)
623{
624 NTSTATUS status;
625 DATA_BLOB blob = data_blob_const(*ppdata, *p_data_size);
626 DATA_BLOB response = data_blob_null;
627 struct smb_srv_trans_enc_ctx *ec;
628
629 if (!partial_srv_trans_enc_ctx) {
630 /* This is the initial step. */
631 status = srv_enc_ntlm_negotiate(ppdata, p_data_size, blob, false);
632 if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
633 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
634 return nt_status_squash(status);
635 }
636 return status;
637 }
638
639 ec = partial_srv_trans_enc_ctx;
640 if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
641 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
642 return NT_STATUS_INVALID_PARAMETER;
643 }
644
645 /* Second step. */
646 status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, blob, &response);
647
648 if (NT_STATUS_IS_OK(status)) {
649 /* Return the context we're using for this encryption state. */
650 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
651 return NT_STATUS_NO_MEMORY;
652 }
653 SSVAL(*pparam,0,ec->es->enc_ctx_num);
654 *p_param_size = 2;
655 }
656
657 /* Return the raw blob. */
658 SAFE_FREE(*ppdata);
659 *ppdata = (unsigned char *)memdup(response.data, response.length);
660 if ((*ppdata) == NULL && response.length > 0)
661 return NT_STATUS_NO_MEMORY;
662 *p_data_size = response.length;
663 data_blob_free(&response);
664 return status;
665}
666
667/******************************************************************************
668 Do the SPNEGO encryption negotiation. Parameters are in/out.
669******************************************************************************/
670
671NTSTATUS srv_request_encryption_setup(connection_struct *conn,
672 unsigned char **ppdata,
673 size_t *p_data_size,
674 unsigned char **pparam,
675 size_t *p_param_size)
676{
677 unsigned char *pdata = *ppdata;
678
679 SAFE_FREE(*pparam);
680 *p_param_size = 0;
681
682 if (*p_data_size < 1) {
683 return NT_STATUS_INVALID_PARAMETER;
684 }
685
686 if (pdata[0] == ASN1_APPLICATION(0)) {
687 /* its a negTokenTarg packet */
688 return srv_enc_spnego_negotiate(conn, ppdata, p_data_size, pparam, p_param_size);
689 }
690
691 if (pdata[0] == ASN1_CONTEXT(1)) {
692 /* It's an auth packet */
693 return srv_enc_spnego_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
694 }
695
696 /* Maybe it's a raw unwrapped auth ? */
697 if (*p_data_size < 7) {
698 return NT_STATUS_INVALID_PARAMETER;
699 }
700
701 if (strncmp((char *)pdata, "NTLMSSP", 7) == 0) {
702 return srv_enc_raw_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
703 }
704
705 DEBUG(1,("srv_request_encryption_setup: Unknown packet\n"));
706
707 return NT_STATUS_LOGON_FAILURE;
708}
709
710/******************************************************************************
711 Negotiation was successful - turn on server-side encryption.
712******************************************************************************/
713
714static NTSTATUS check_enc_good(struct smb_srv_trans_enc_ctx *ec)
715{
716 if (!ec || !ec->es) {
717 return NT_STATUS_LOGON_FAILURE;
718 }
719
720 if (ec->es->smb_enc_type == SMB_TRANS_ENC_NTLM) {
721 if (!auth_ntlmssp_negotiated_sign((ec->auth_ntlmssp_state))) {
722 return NT_STATUS_INVALID_PARAMETER;
723 }
724
725 if (!auth_ntlmssp_negotiated_seal((ec->auth_ntlmssp_state))) {
726 return NT_STATUS_INVALID_PARAMETER;
727 }
728 }
729 /* Todo - check gssapi case. */
730
731 return NT_STATUS_OK;
732}
733
734/******************************************************************************
735 Negotiation was successful - turn on server-side encryption.
736******************************************************************************/
737
738NTSTATUS srv_encryption_start(connection_struct *conn)
739{
740 NTSTATUS status;
741
742 /* Check that we are really doing sign+seal. */
743 status = check_enc_good(partial_srv_trans_enc_ctx);
744 if (!NT_STATUS_IS_OK(status)) {
745 return status;
746 }
747 /* Throw away the context we're using currently (if any). */
748 srv_free_encryption_context(&srv_trans_enc_ctx);
749
750 /* Steal the partial pointer. Deliberate shallow copy. */
751 srv_trans_enc_ctx = partial_srv_trans_enc_ctx;
752 srv_trans_enc_ctx->es->enc_on = true;
753
754 partial_srv_trans_enc_ctx = NULL;
755
756 DEBUG(1,("srv_encryption_start: context negotiated\n"));
757 return NT_STATUS_OK;
758}
759
760/******************************************************************************
761 Shutdown all server contexts.
762******************************************************************************/
763
764void server_encryption_shutdown(void)
765{
766 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
767 srv_free_encryption_context(&srv_trans_enc_ctx);
768}
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