source: vendor/3.5.4/source3/smbd/seal.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 21.6 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/globals.h"
22#include "../libcli/auth/spnego.h"
23
24/******************************************************************************
25 Server side encryption.
26******************************************************************************/
27
28/******************************************************************************
29 Global server state.
30******************************************************************************/
31
32struct smb_srv_trans_enc_ctx {
33 struct smb_trans_enc_state *es;
34 AUTH_NTLMSSP_STATE *auth_ntlmssp_state; /* Must be kept in sync with pointer in ec->ntlmssp_state. */
35};
36
37/******************************************************************************
38 Return global enc context - this must change if we ever do multiple contexts.
39******************************************************************************/
40
41uint16_t srv_enc_ctx(void)
42{
43 return srv_trans_enc_ctx->es->enc_ctx_num;
44}
45
46/******************************************************************************
47 Is this an incoming encrypted packet ?
48******************************************************************************/
49
50bool is_encrypted_packet(const uint8_t *inbuf)
51{
52 NTSTATUS status;
53 uint16_t enc_num;
54
55 /* Ignore non-session messages or non 0xFF'E' messages. */
56 if(CVAL(inbuf,0) || !(inbuf[4] == 0xFF && inbuf[5] == 'E')) {
57 return false;
58 }
59
60 status = get_enc_ctx_num(inbuf, &enc_num);
61 if (!NT_STATUS_IS_OK(status)) {
62 return false;
63 }
64
65 /* Encrypted messages are 0xFF'E'<ctx> */
66 if (srv_trans_enc_ctx && enc_num == srv_enc_ctx()) {
67 return true;
68 }
69 return false;
70}
71
72/******************************************************************************
73 Create an auth_ntlmssp_state and ensure pointer copy is correct.
74******************************************************************************/
75
76static NTSTATUS make_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
77{
78 NTSTATUS status = auth_ntlmssp_start(&ec->auth_ntlmssp_state);
79 if (!NT_STATUS_IS_OK(status)) {
80 return nt_status_squash(status);
81 }
82
83 /*
84 * We must remember to update the pointer copy for the common
85 * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
86 */
87 ec->es->s.ntlmssp_state = ec->auth_ntlmssp_state->ntlmssp_state;
88 return status;
89}
90
91/******************************************************************************
92 Destroy an auth_ntlmssp_state and ensure pointer copy is correct.
93******************************************************************************/
94
95static void destroy_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
96{
97 /*
98 * We must remember to update the pointer copy for the common
99 * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
100 */
101
102 if (ec->auth_ntlmssp_state) {
103 auth_ntlmssp_end(&ec->auth_ntlmssp_state);
104 /* The auth_ntlmssp_end killed this already. */
105 ec->es->s.ntlmssp_state = NULL;
106 }
107}
108
109#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
110
111/******************************************************************************
112 Import a name.
113******************************************************************************/
114
115static NTSTATUS get_srv_gss_creds(const char *service,
116 const char *name,
117 gss_cred_usage_t cred_type,
118 gss_cred_id_t *p_srv_cred)
119{
120 OM_uint32 ret;
121 OM_uint32 min;
122 gss_name_t srv_name;
123 gss_buffer_desc input_name;
124 char *host_princ_s = NULL;
125 NTSTATUS status = NT_STATUS_OK;
126
127 gss_OID_desc nt_hostbased_service =
128 {10, CONST_DISCARD(char *,"\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x04")};
129
130 if (asprintf(&host_princ_s, "%s@%s", service, name) == -1) {
131 return NT_STATUS_NO_MEMORY;
132 }
133
134 input_name.value = host_princ_s;
135 input_name.length = strlen(host_princ_s) + 1;
136
137 ret = gss_import_name(&min,
138 &input_name,
139 &nt_hostbased_service,
140 &srv_name);
141
142 DEBUG(10,("get_srv_gss_creds: imported name %s\n",
143 host_princ_s ));
144
145 if (ret != GSS_S_COMPLETE) {
146 SAFE_FREE(host_princ_s);
147 return map_nt_error_from_gss(ret, min);
148 }
149
150 /*
151 * We're accessing the krb5.keytab file here.
152 * ensure we have permissions to do so.
153 */
154 become_root();
155
156 ret = gss_acquire_cred(&min,
157 srv_name,
158 GSS_C_INDEFINITE,
159 GSS_C_NULL_OID_SET,
160 cred_type,
161 p_srv_cred,
162 NULL,
163 NULL);
164 unbecome_root();
165
166 if (ret != GSS_S_COMPLETE) {
167 ADS_STATUS adss = ADS_ERROR_GSS(ret, min);
168 DEBUG(10,("get_srv_gss_creds: gss_acquire_cred failed with %s\n",
169 ads_errstr(adss)));
170 status = map_nt_error_from_gss(ret, min);
171 }
172
173 SAFE_FREE(host_princ_s);
174 gss_release_name(&min, &srv_name);
175 return status;
176}
177
178/******************************************************************************
179 Create a gss state.
180 Try and get the cifs/server@realm principal first, then fall back to
181 host/server@realm.
182******************************************************************************/
183
184static NTSTATUS make_auth_gss(struct smb_srv_trans_enc_ctx *ec)
185{
186 NTSTATUS status;
187 gss_cred_id_t srv_cred;
188 fstring fqdn;
189
190 name_to_fqdn(fqdn, global_myname());
191 strlower_m(fqdn);
192
193 status = get_srv_gss_creds("cifs", fqdn, GSS_C_ACCEPT, &srv_cred);
194 if (!NT_STATUS_IS_OK(status)) {
195 status = get_srv_gss_creds("host", fqdn, GSS_C_ACCEPT, &srv_cred);
196 if (!NT_STATUS_IS_OK(status)) {
197 return nt_status_squash(status);
198 }
199 }
200
201 ec->es->s.gss_state = SMB_MALLOC_P(struct smb_tran_enc_state_gss);
202 if (!ec->es->s.gss_state) {
203 OM_uint32 min;
204 gss_release_cred(&min, &srv_cred);
205 return NT_STATUS_NO_MEMORY;
206 }
207 ZERO_STRUCTP(ec->es->s.gss_state);
208 ec->es->s.gss_state->creds = srv_cred;
209
210 /* No context yet. */
211 ec->es->s.gss_state->gss_ctx = GSS_C_NO_CONTEXT;
212
213 return NT_STATUS_OK;
214}
215#endif
216
217/******************************************************************************
218 Shutdown a server encryption context.
219******************************************************************************/
220
221static void srv_free_encryption_context(struct smb_srv_trans_enc_ctx **pp_ec)
222{
223 struct smb_srv_trans_enc_ctx *ec = *pp_ec;
224
225 if (!ec) {
226 return;
227 }
228
229 if (ec->es) {
230 switch (ec->es->smb_enc_type) {
231 case SMB_TRANS_ENC_NTLM:
232 destroy_auth_ntlmssp(ec);
233 break;
234#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
235 case SMB_TRANS_ENC_GSS:
236 break;
237#endif
238 }
239 common_free_encryption_state(&ec->es);
240 }
241
242 SAFE_FREE(ec);
243 *pp_ec = NULL;
244}
245
246/******************************************************************************
247 Create a server encryption context.
248******************************************************************************/
249
250static NTSTATUS make_srv_encryption_context(enum smb_trans_enc_type smb_enc_type, struct smb_srv_trans_enc_ctx **pp_ec)
251{
252 struct smb_srv_trans_enc_ctx *ec;
253
254 *pp_ec = NULL;
255
256 ec = SMB_MALLOC_P(struct smb_srv_trans_enc_ctx);
257 if (!ec) {
258 return NT_STATUS_NO_MEMORY;
259 }
260 ZERO_STRUCTP(partial_srv_trans_enc_ctx);
261 ec->es = SMB_MALLOC_P(struct smb_trans_enc_state);
262 if (!ec->es) {
263 SAFE_FREE(ec);
264 return NT_STATUS_NO_MEMORY;
265 }
266 ZERO_STRUCTP(ec->es);
267 ec->es->smb_enc_type = smb_enc_type;
268 switch (smb_enc_type) {
269 case SMB_TRANS_ENC_NTLM:
270 {
271 NTSTATUS status = make_auth_ntlmssp(ec);
272 if (!NT_STATUS_IS_OK(status)) {
273 srv_free_encryption_context(&ec);
274 return status;
275 }
276 }
277 break;
278
279#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
280 case SMB_TRANS_ENC_GSS:
281 /* Acquire our credentials by calling gss_acquire_cred here. */
282 {
283 NTSTATUS status = make_auth_gss(ec);
284 if (!NT_STATUS_IS_OK(status)) {
285 srv_free_encryption_context(&ec);
286 return status;
287 }
288 }
289 break;
290#endif
291 default:
292 srv_free_encryption_context(&ec);
293 return NT_STATUS_INVALID_PARAMETER;
294 }
295 *pp_ec = ec;
296 return NT_STATUS_OK;
297}
298
299/******************************************************************************
300 Free an encryption-allocated buffer.
301******************************************************************************/
302
303void srv_free_enc_buffer(char *buf)
304{
305 /* We know this is an smb buffer, and we
306 * didn't malloc, only copy, for a keepalive,
307 * so ignore non-session messages. */
308
309 if(CVAL(buf,0)) {
310 return;
311 }
312
313 if (srv_trans_enc_ctx) {
314 common_free_enc_buffer(srv_trans_enc_ctx->es, buf);
315 }
316}
317
318/******************************************************************************
319 Decrypt an incoming buffer.
320******************************************************************************/
321
322NTSTATUS srv_decrypt_buffer(char *buf)
323{
324 /* Ignore non-session messages. */
325 if(CVAL(buf,0)) {
326 return NT_STATUS_OK;
327 }
328
329 if (srv_trans_enc_ctx) {
330 return common_decrypt_buffer(srv_trans_enc_ctx->es, buf);
331 }
332
333 return NT_STATUS_OK;
334}
335
336/******************************************************************************
337 Encrypt an outgoing buffer. Return the encrypted pointer in buf_out.
338******************************************************************************/
339
340NTSTATUS srv_encrypt_buffer(char *buf, char **buf_out)
341{
342 *buf_out = buf;
343
344 /* Ignore non-session messages. */
345 if(CVAL(buf,0)) {
346 return NT_STATUS_OK;
347 }
348
349 if (srv_trans_enc_ctx) {
350 return common_encrypt_buffer(srv_trans_enc_ctx->es, buf, buf_out);
351 }
352 /* Not encrypting. */
353 return NT_STATUS_OK;
354}
355
356/******************************************************************************
357 Do the gss encryption negotiation. Parameters are in/out.
358 Until success we do everything on the partial enc ctx.
359******************************************************************************/
360
361#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
362static NTSTATUS srv_enc_spnego_gss_negotiate(unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob)
363{
364 OM_uint32 ret;
365 OM_uint32 min;
366 OM_uint32 flags = 0;
367 gss_buffer_desc in_buf, out_buf;
368 struct smb_tran_enc_state_gss *gss_state;
369 DATA_BLOB auth_reply = data_blob_null;
370 DATA_BLOB response = data_blob_null;
371 NTSTATUS status;
372
373 if (!partial_srv_trans_enc_ctx) {
374 status = make_srv_encryption_context(SMB_TRANS_ENC_GSS, &partial_srv_trans_enc_ctx);
375 if (!NT_STATUS_IS_OK(status)) {
376 return status;
377 }
378 }
379
380 gss_state = partial_srv_trans_enc_ctx->es->s.gss_state;
381
382 in_buf.value = secblob.data;
383 in_buf.length = secblob.length;
384
385 out_buf.value = NULL;
386 out_buf.length = 0;
387
388 become_root();
389
390 ret = gss_accept_sec_context(&min,
391 &gss_state->gss_ctx,
392 gss_state->creds,
393 &in_buf,
394 GSS_C_NO_CHANNEL_BINDINGS,
395 NULL,
396 NULL, /* Ignore oids. */
397 &out_buf, /* To return. */
398 &flags,
399 NULL, /* Ingore time. */
400 NULL); /* Ignore delegated creds. */
401 unbecome_root();
402
403 status = gss_err_to_ntstatus(ret, min);
404 if (ret != GSS_S_COMPLETE && ret != GSS_S_CONTINUE_NEEDED) {
405 return status;
406 }
407
408 /* Ensure we've got sign+seal available. */
409 if (ret == GSS_S_COMPLETE) {
410 if ((flags & (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) !=
411 (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) {
412 DEBUG(0,("srv_enc_spnego_gss_negotiate: quality of service not good enough "
413 "for SMB sealing.\n"));
414 gss_release_buffer(&min, &out_buf);
415 return NT_STATUS_ACCESS_DENIED;
416 }
417 }
418
419 auth_reply = data_blob(out_buf.value, out_buf.length);
420 gss_release_buffer(&min, &out_buf);
421
422 /* Wrap in SPNEGO. */
423 response = spnego_gen_auth_response(&auth_reply, status, OID_KERBEROS5);
424 data_blob_free(&auth_reply);
425
426 SAFE_FREE(*ppdata);
427 *ppdata = (unsigned char *)memdup(response.data, response.length);
428 if ((*ppdata) == NULL && response.length > 0) {
429 status = NT_STATUS_NO_MEMORY;
430 }
431 *p_data_size = response.length;
432
433 data_blob_free(&response);
434
435 return status;
436}
437#endif
438
439/******************************************************************************
440 Do the NTLM SPNEGO (or raw) encryption negotiation. Parameters are in/out.
441 Until success we do everything on the partial enc ctx.
442******************************************************************************/
443
444static NTSTATUS srv_enc_ntlm_negotiate(unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob, bool spnego_wrap)
445{
446 NTSTATUS status;
447 DATA_BLOB chal = data_blob_null;
448 DATA_BLOB response = data_blob_null;
449
450 status = make_srv_encryption_context(SMB_TRANS_ENC_NTLM, &partial_srv_trans_enc_ctx);
451 if (!NT_STATUS_IS_OK(status)) {
452 return status;
453 }
454
455 status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, secblob, &chal);
456
457 /* status here should be NT_STATUS_MORE_PROCESSING_REQUIRED
458 * for success ... */
459
460 if (spnego_wrap) {
461 response = spnego_gen_auth_response(&chal, status, OID_NTLMSSP);
462 data_blob_free(&chal);
463 } else {
464 /* Return the raw blob. */
465 response = chal;
466 }
467
468 SAFE_FREE(*ppdata);
469 *ppdata = (unsigned char *)memdup(response.data, response.length);
470 if ((*ppdata) == NULL && response.length > 0) {
471 status = NT_STATUS_NO_MEMORY;
472 }
473 *p_data_size = response.length;
474 data_blob_free(&response);
475
476 return status;
477}
478
479/******************************************************************************
480 Do the SPNEGO encryption negotiation. Parameters are in/out.
481 Based off code in smbd/sesssionsetup.c
482 Until success we do everything on the partial enc ctx.
483******************************************************************************/
484
485static NTSTATUS srv_enc_spnego_negotiate(connection_struct *conn,
486 unsigned char **ppdata,
487 size_t *p_data_size,
488 unsigned char **pparam,
489 size_t *p_param_size)
490{
491 NTSTATUS status;
492 DATA_BLOB blob = data_blob_null;
493 DATA_BLOB secblob = data_blob_null;
494 char *kerb_mech = NULL;
495
496 blob = data_blob_const(*ppdata, *p_data_size);
497
498 status = parse_spnego_mechanisms(blob, &secblob, &kerb_mech);
499 if (!NT_STATUS_IS_OK(status)) {
500 return nt_status_squash(status);
501 }
502
503 /* We should have no partial context at this point. */
504
505 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
506
507 if (kerb_mech) {
508 SAFE_FREE(kerb_mech);
509
510#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
511 status = srv_enc_spnego_gss_negotiate(ppdata, p_data_size, secblob);
512#else
513 /* Currently we don't SPNEGO negotiate
514 * back to NTLMSSP as we do in sessionsetupX. We should... */
515 return NT_STATUS_LOGON_FAILURE;
516#endif
517 } else {
518 status = srv_enc_ntlm_negotiate(ppdata, p_data_size, secblob, true);
519 }
520
521 data_blob_free(&secblob);
522
523 if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
524 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
525 return nt_status_squash(status);
526 }
527
528 if (NT_STATUS_IS_OK(status)) {
529 /* Return the context we're using for this encryption state. */
530 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
531 return NT_STATUS_NO_MEMORY;
532 }
533 SSVAL(*pparam,0,partial_srv_trans_enc_ctx->es->enc_ctx_num);
534 *p_param_size = 2;
535 }
536
537 return status;
538}
539
540/******************************************************************************
541 Complete a SPNEGO encryption negotiation. Parameters are in/out.
542 We only get this for a NTLM auth second stage.
543******************************************************************************/
544
545static NTSTATUS srv_enc_spnego_ntlm_auth(connection_struct *conn,
546 unsigned char **ppdata,
547 size_t *p_data_size,
548 unsigned char **pparam,
549 size_t *p_param_size)
550{
551 NTSTATUS status;
552 DATA_BLOB blob = data_blob_null;
553 DATA_BLOB auth = data_blob_null;
554 DATA_BLOB auth_reply = data_blob_null;
555 DATA_BLOB response = data_blob_null;
556 struct smb_srv_trans_enc_ctx *ec = partial_srv_trans_enc_ctx;
557
558 /* We must have a partial context here. */
559
560 if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
561 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
562 return NT_STATUS_INVALID_PARAMETER;
563 }
564
565 blob = data_blob_const(*ppdata, *p_data_size);
566 if (!spnego_parse_auth(blob, &auth)) {
567 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
568 return NT_STATUS_INVALID_PARAMETER;
569 }
570
571 status = auth_ntlmssp_update(ec->auth_ntlmssp_state, auth, &auth_reply);
572 data_blob_free(&auth);
573
574 /* From RFC4178.
575 *
576 * supportedMech
577 *
578 * This field SHALL only be present in the first reply from the
579 * target.
580 * So set mechOID to NULL here.
581 */
582
583 response = spnego_gen_auth_response(&auth_reply, status, NULL);
584 data_blob_free(&auth_reply);
585
586 if (NT_STATUS_IS_OK(status)) {
587 /* Return the context we're using for this encryption state. */
588 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
589 return NT_STATUS_NO_MEMORY;
590 }
591 SSVAL(*pparam,0,ec->es->enc_ctx_num);
592 *p_param_size = 2;
593 }
594
595 SAFE_FREE(*ppdata);
596 *ppdata = (unsigned char *)memdup(response.data, response.length);
597 if ((*ppdata) == NULL && response.length > 0)
598 return NT_STATUS_NO_MEMORY;
599 *p_data_size = response.length;
600 data_blob_free(&response);
601 return status;
602}
603
604/******************************************************************************
605 Raw NTLM encryption negotiation. Parameters are in/out.
606 This function does both steps.
607******************************************************************************/
608
609static NTSTATUS srv_enc_raw_ntlm_auth(connection_struct *conn,
610 unsigned char **ppdata,
611 size_t *p_data_size,
612 unsigned char **pparam,
613 size_t *p_param_size)
614{
615 NTSTATUS status;
616 DATA_BLOB blob = data_blob_const(*ppdata, *p_data_size);
617 DATA_BLOB response = data_blob_null;
618 struct smb_srv_trans_enc_ctx *ec;
619
620 if (!partial_srv_trans_enc_ctx) {
621 /* This is the initial step. */
622 status = srv_enc_ntlm_negotiate(ppdata, p_data_size, blob, false);
623 if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
624 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
625 return nt_status_squash(status);
626 }
627 return status;
628 }
629
630 ec = partial_srv_trans_enc_ctx;
631 if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
632 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
633 return NT_STATUS_INVALID_PARAMETER;
634 }
635
636 /* Second step. */
637 status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, blob, &response);
638
639 if (NT_STATUS_IS_OK(status)) {
640 /* Return the context we're using for this encryption state. */
641 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
642 return NT_STATUS_NO_MEMORY;
643 }
644 SSVAL(*pparam,0,ec->es->enc_ctx_num);
645 *p_param_size = 2;
646 }
647
648 /* Return the raw blob. */
649 SAFE_FREE(*ppdata);
650 *ppdata = (unsigned char *)memdup(response.data, response.length);
651 if ((*ppdata) == NULL && response.length > 0)
652 return NT_STATUS_NO_MEMORY;
653 *p_data_size = response.length;
654 data_blob_free(&response);
655 return status;
656}
657
658/******************************************************************************
659 Do the SPNEGO encryption negotiation. Parameters are in/out.
660******************************************************************************/
661
662NTSTATUS srv_request_encryption_setup(connection_struct *conn,
663 unsigned char **ppdata,
664 size_t *p_data_size,
665 unsigned char **pparam,
666 size_t *p_param_size)
667{
668 unsigned char *pdata = *ppdata;
669
670 SAFE_FREE(*pparam);
671 *p_param_size = 0;
672
673 if (*p_data_size < 1) {
674 return NT_STATUS_INVALID_PARAMETER;
675 }
676
677 if (pdata[0] == ASN1_APPLICATION(0)) {
678 /* its a negTokenTarg packet */
679 return srv_enc_spnego_negotiate(conn, ppdata, p_data_size, pparam, p_param_size);
680 }
681
682 if (pdata[0] == ASN1_CONTEXT(1)) {
683 /* It's an auth packet */
684 return srv_enc_spnego_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
685 }
686
687 /* Maybe it's a raw unwrapped auth ? */
688 if (*p_data_size < 7) {
689 return NT_STATUS_INVALID_PARAMETER;
690 }
691
692 if (strncmp((char *)pdata, "NTLMSSP", 7) == 0) {
693 return srv_enc_raw_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
694 }
695
696 DEBUG(1,("srv_request_encryption_setup: Unknown packet\n"));
697
698 return NT_STATUS_LOGON_FAILURE;
699}
700
701/******************************************************************************
702 Negotiation was successful - turn on server-side encryption.
703******************************************************************************/
704
705static NTSTATUS check_enc_good(struct smb_srv_trans_enc_ctx *ec)
706{
707 if (!ec || !ec->es) {
708 return NT_STATUS_LOGON_FAILURE;
709 }
710
711 if (ec->es->smb_enc_type == SMB_TRANS_ENC_NTLM) {
712 if ((ec->es->s.ntlmssp_state->neg_flags & (NTLMSSP_NEGOTIATE_SIGN|NTLMSSP_NEGOTIATE_SEAL)) !=
713 (NTLMSSP_NEGOTIATE_SIGN|NTLMSSP_NEGOTIATE_SEAL)) {
714 return NT_STATUS_INVALID_PARAMETER;
715 }
716 }
717 /* Todo - check gssapi case. */
718
719 return NT_STATUS_OK;
720}
721
722/******************************************************************************
723 Negotiation was successful - turn on server-side encryption.
724******************************************************************************/
725
726NTSTATUS srv_encryption_start(connection_struct *conn)
727{
728 NTSTATUS status;
729
730 /* Check that we are really doing sign+seal. */
731 status = check_enc_good(partial_srv_trans_enc_ctx);
732 if (!NT_STATUS_IS_OK(status)) {
733 return status;
734 }
735 /* Throw away the context we're using currently (if any). */
736 srv_free_encryption_context(&srv_trans_enc_ctx);
737
738 /* Steal the partial pointer. Deliberate shallow copy. */
739 srv_trans_enc_ctx = partial_srv_trans_enc_ctx;
740 srv_trans_enc_ctx->es->enc_on = true;
741
742 partial_srv_trans_enc_ctx = NULL;
743
744 DEBUG(1,("srv_encryption_start: context negotiated\n"));
745 return NT_STATUS_OK;
746}
747
748/******************************************************************************
749 Shutdown all server contexts.
750******************************************************************************/
751
752void server_encryption_shutdown(void)
753{
754 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
755 srv_free_encryption_context(&srv_trans_enc_ctx);
756}
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