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auth/spnego: generate a valid packet if gensec_spnego_client_negTokenTarg() gives...
[Samba.git] / auth / gensec / spnego.c
blob5eb75ad47aab2d528991969da765def95aed347f
1 /*
2 Unix SMB/CIFS implementation.
3
4 RFC2478 Compliant SPNEGO implementation
5
6 Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
7 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
8 Copyright (C) Stefan Metzmacher <metze@samba.org> 2004-2008
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 */
24
25 #include "includes.h"
26 #include <tevent.h>
27 #include "lib/util/tevent_ntstatus.h"
28 #include "../libcli/auth/spnego.h"
29 #include "librpc/gen_ndr/ndr_dcerpc.h"
30 #include "auth/credentials/credentials.h"
31 #include "auth/gensec/gensec.h"
32 #include "auth/gensec/gensec_internal.h"
33 #include "param/param.h"
34 #include "lib/util/asn1.h"
35 #include "lib/util/base64.h"
36
37 #undef strcasecmp
38
39 _PUBLIC_ NTSTATUS gensec_spnego_init(TALLOC_CTX *ctx);
40
41 enum spnego_state_position {
42 SPNEGO_SERVER_START,
43 SPNEGO_CLIENT_START,
44 SPNEGO_SERVER_TARG,
45 SPNEGO_CLIENT_TARG,
46 SPNEGO_FALLBACK,
47 SPNEGO_DONE
48 };
49
50 struct spnego_state {
51 enum spnego_message_type expected_packet;
52 enum spnego_state_position state_position;
53 struct gensec_security *sub_sec_security;
54 bool sub_sec_ready;
55
56 const char *neg_oid;
57
58 DATA_BLOB mech_types;
59 size_t num_targs;
60 bool downgraded;
61 bool mic_requested;
62 bool needs_mic_sign;
63 bool needs_mic_check;
64 bool may_skip_mic_check;
65 bool done_mic_check;
66
67 bool simulate_w2k;
68
69 /*
70 * The following is used to implement
71 * the update token fragmentation
72 */
73 size_t in_needed;
74 DATA_BLOB in_frag;
75 size_t out_max_length;
76 DATA_BLOB out_frag;
77 NTSTATUS out_status;
78 };
79
80 static void gensec_spnego_update_sub_abort(struct spnego_state *spnego_state)
81 {
82 spnego_state->sub_sec_ready = false;
83 TALLOC_FREE(spnego_state->sub_sec_security);
84 }
85
86 static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_security)
87 {
88 struct spnego_state *spnego_state;
89
90 spnego_state = talloc_zero(gensec_security, struct spnego_state);
91 if (!spnego_state) {
92 return NT_STATUS_NO_MEMORY;
93 }
94
95 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
96 spnego_state->state_position = SPNEGO_CLIENT_START;
97 spnego_state->sub_sec_security = NULL;
98 spnego_state->sub_sec_ready = false;
99 spnego_state->mech_types = data_blob_null;
100 spnego_state->out_max_length = gensec_max_update_size(gensec_security);
101 spnego_state->out_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
102
103 spnego_state->simulate_w2k = gensec_setting_bool(gensec_security->settings,
104 "spnego", "simulate_w2k", false);
105
106 gensec_security->private_data = spnego_state;
107 return NT_STATUS_OK;
108 }
109
110 static NTSTATUS gensec_spnego_server_start(struct gensec_security *gensec_security)
111 {
112 struct spnego_state *spnego_state;
113
114 spnego_state = talloc_zero(gensec_security, struct spnego_state);
115 if (!spnego_state) {
116 return NT_STATUS_NO_MEMORY;
117 }
118
119 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
120 spnego_state->state_position = SPNEGO_SERVER_START;
121 spnego_state->sub_sec_security = NULL;
122 spnego_state->sub_sec_ready = false;
123 spnego_state->mech_types = data_blob_null;
124 spnego_state->out_max_length = gensec_max_update_size(gensec_security);
125 spnego_state->out_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
126
127 spnego_state->simulate_w2k = gensec_setting_bool(gensec_security->settings,
128 "spnego", "simulate_w2k", false);
129
130 gensec_security->private_data = spnego_state;
131 return NT_STATUS_OK;
132 }
133
134 /** Fallback to another GENSEC mechanism, based on magic strings
135 *
136 * This is the 'fallback' case, where we don't get SPNEGO, and have to
137 * try all the other options (and hope they all have a magic string
138 * they check)
139 */
140
141 static NTSTATUS gensec_spnego_server_try_fallback(struct gensec_security *gensec_security,
142 struct spnego_state *spnego_state,
143 TALLOC_CTX *mem_ctx,
144 const DATA_BLOB in)
145 {
146 int i,j;
147 const struct gensec_security_ops **all_ops;
148
149 all_ops = gensec_security_mechs(gensec_security, mem_ctx);
150
151 for (i=0; all_ops && all_ops[i]; i++) {
152 bool is_spnego;
153 NTSTATUS nt_status;
154
155 if (gensec_security != NULL &&
156 !gensec_security_ops_enabled(all_ops[i], gensec_security))
157 {
158 continue;
159 }
160
161 if (!all_ops[i]->oid) {
162 continue;
163 }
164
165 is_spnego = false;
166 for (j=0; all_ops[i]->oid[j]; j++) {
167 if (strcasecmp(GENSEC_OID_SPNEGO,all_ops[i]->oid[j]) == 0) {
168 is_spnego = true;
169 }
170 }
171 if (is_spnego) {
172 continue;
173 }
174
175 if (!all_ops[i]->magic) {
176 continue;
177 }
178
179 nt_status = all_ops[i]->magic(gensec_security, &in);
180 if (!NT_STATUS_IS_OK(nt_status)) {
181 continue;
182 }
183
184 spnego_state->state_position = SPNEGO_FALLBACK;
185
186 nt_status = gensec_subcontext_start(spnego_state,
187 gensec_security,
188 &spnego_state->sub_sec_security);
189
190 if (!NT_STATUS_IS_OK(nt_status)) {
191 return nt_status;
192 }
193 /* select the sub context */
194 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
195 all_ops[i]);
196 if (!NT_STATUS_IS_OK(nt_status)) {
197 return nt_status;
198 }
199
200 return NT_STATUS_OK;
201 }
202 DEBUG(1, ("Failed to parse SPNEGO request\n"));
203 return NT_STATUS_INVALID_PARAMETER;
204 }
205
206 /** create a negTokenInit
207 *
208 * This is the same packet, no matter if the client or server sends it first, but it is always the first packet
209 */
210 static NTSTATUS gensec_spnego_create_negTokenInit(struct gensec_security *gensec_security,
211 struct spnego_state *spnego_state,
212 TALLOC_CTX *out_mem_ctx,
213 struct tevent_context *ev,
214 DATA_BLOB *out)
215 {
216 NTSTATUS status;
217 const char **mechTypes = NULL;
218 DATA_BLOB unwrapped_out = data_blob_null;
219 size_t all_idx = 0;
220 const struct gensec_security_ops_wrapper *all_sec;
221 const struct gensec_security_ops_wrapper *cur_sec = NULL;
222 const char **send_mech_types = NULL;
223 struct spnego_data spnego_out;
224 bool ok;
225
226 mechTypes = gensec_security_oids(gensec_security,
227 out_mem_ctx, GENSEC_OID_SPNEGO);
228 if (mechTypes == NULL) {
229 DBG_WARNING("gensec_security_oids() failed\n");
230 return NT_STATUS_NO_MEMORY;
231 }
232
233 all_sec = gensec_security_by_oid_list(gensec_security,
234 out_mem_ctx,
235 mechTypes,
236 GENSEC_OID_SPNEGO);
237 if (all_sec == NULL) {
238 DBG_WARNING("gensec_security_by_oid_list() failed\n");
239 return NT_STATUS_NO_MEMORY;
240 }
241
242 for (; all_sec[all_idx].op != NULL; all_idx++) {
243 const char *next = NULL;
244 const char *principal = NULL;
245 int dbg_level = DBGLVL_WARNING;
246
247 cur_sec = &all_sec[all_idx];
248
249 status = gensec_subcontext_start(spnego_state,
250 gensec_security,
251 &spnego_state->sub_sec_security);
252 if (!NT_STATUS_IS_OK(status)) {
253 return status;
254 }
255 /* select the sub context */
256 status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
257 cur_sec->op);
258 if (!NT_STATUS_IS_OK(status)) {
259 gensec_spnego_update_sub_abort(spnego_state);
260 continue;
261 }
262
263 if (spnego_state->state_position != SPNEGO_CLIENT_START) {
264 /*
265 * The server doesn't generate an optimistic token.
266 */
267 goto reply;
268 }
269
270 /* In the client, try and produce the first (optimistic) packet */
271 status = gensec_update_ev(spnego_state->sub_sec_security,
272 out_mem_ctx,
273 ev,
274 data_blob_null,
275 &unwrapped_out);
276 if (NT_STATUS_IS_OK(status)) {
277 spnego_state->sub_sec_ready = true;
278 }
279
280 if (!GENSEC_UPDATE_IS_NTERROR(status)) {
281 goto reply;
282 }
283
284 if (cur_sec[1].op != NULL) {
285 next = cur_sec[1].op->name;
286 dbg_level = DBGLVL_NOTICE;
287 }
288
289 if (gensec_security->target.principal != NULL) {
290 principal = gensec_security->target.principal;
291 } else if (gensec_security->target.service != NULL &&
292 gensec_security->target.hostname != NULL)
293 {
294 principal = talloc_asprintf(spnego_state->sub_sec_security,
295 "%s/%s",
296 gensec_security->target.service,
297 gensec_security->target.hostname);
298 } else {
299 principal = gensec_security->target.hostname;
300 }
301
302 DBG_PREFIX(dbg_level, (
303 "%s: creating NEG_TOKEN_INIT for %s failed "
304 "(next[%s]): %s\n", cur_sec->op->name,
305 principal, next, nt_errstr(status)));
306
307 if (next == NULL) {
308 /*
309 * A hard error without a possible fallback.
310 */
311 return status;
312 }
313
314 /*
315 * Pretend we never started it
316 */
317 gensec_spnego_update_sub_abort(spnego_state);
318 }
319
320 DBG_WARNING("Failed to setup SPNEGO negTokenInit request\n");
321 return NT_STATUS_INVALID_PARAMETER;
322
323 reply:
324 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
325
326 send_mech_types = gensec_security_oids_from_ops_wrapped(out_mem_ctx,
327 cur_sec);
328 if (send_mech_types == NULL) {
329 DBG_WARNING("gensec_security_oids_from_ops_wrapped() failed\n");
330 return NT_STATUS_NO_MEMORY;
331 }
332
333 ok = spnego_write_mech_types(spnego_state,
334 send_mech_types,
335 &spnego_state->mech_types);
336 if (!ok) {
337 DBG_ERR("Failed to write mechTypes\n");
338 return NT_STATUS_NO_MEMORY;
339 }
340
341 /* List the remaining mechs as options */
342 spnego_out.negTokenInit.mechTypes = send_mech_types;
343 spnego_out.negTokenInit.reqFlags = data_blob_null;
344 spnego_out.negTokenInit.reqFlagsPadding = 0;
345
346 if (spnego_state->state_position == SPNEGO_SERVER_START) {
347 spnego_out.negTokenInit.mechListMIC
348 = data_blob_string_const(ADS_IGNORE_PRINCIPAL);
349 } else {
350 spnego_out.negTokenInit.mechListMIC = data_blob_null;
351 }
352
353 spnego_out.negTokenInit.mechToken = unwrapped_out;
354
355 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
356 DBG_ERR("Failed to write NEG_TOKEN_INIT\n");
357 return NT_STATUS_INVALID_PARAMETER;
358 }
359
360 /*
361 * Note that 'cur_sec' is temporary memory, but
362 * cur_sec->oid points to a const string in the
363 * backends gensec_security_ops structure.
364 */
365 spnego_state->neg_oid = cur_sec->oid;
366
367 /* set next state */
368 if (spnego_state->state_position == SPNEGO_SERVER_START) {
369 spnego_state->state_position = SPNEGO_SERVER_START;
370 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
371 } else {
372 spnego_state->state_position = SPNEGO_CLIENT_TARG;
373 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
374 }
375
376 return NT_STATUS_MORE_PROCESSING_REQUIRED;
377 }
378
379 static NTSTATUS gensec_spnego_client_negTokenInit(struct gensec_security *gensec_security,
380 struct spnego_state *spnego_state,
381 struct tevent_context *ev,
382 struct spnego_data *spnego_in,
383 TALLOC_CTX *out_mem_ctx,
384 DATA_BLOB *out)
385 {
386 TALLOC_CTX *frame = talloc_stackframe();
387 DATA_BLOB sub_out = data_blob_null;
388 const char *tp = NULL;
389 const char * const *mech_types = NULL;
390 size_t all_idx = 0;
391 const struct gensec_security_ops_wrapper *all_sec = NULL;
392 struct spnego_data spnego_out;
393 const char *my_mechs[] = {NULL, NULL};
394 NTSTATUS status;
395 bool ok;
396
397 *out = data_blob_null;
398
399 /* The server offers a list of mechanisms */
400
401 tp = spnego_in->negTokenInit.targetPrincipal;
402 if (tp != NULL && strcmp(tp, ADS_IGNORE_PRINCIPAL) != 0) {
403 DBG_INFO("Server claims it's principal name is %s\n", tp);
404 if (lpcfg_client_use_spnego_principal(gensec_security->settings->lp_ctx)) {
405 gensec_set_target_principal(gensec_security, tp);
406 }
407 }
408
409 mech_types = spnego_in->negTokenInit.mechTypes;
410 if (mech_types == NULL) {
411 TALLOC_FREE(frame);
412 return NT_STATUS_INVALID_PARAMETER;
413 }
414
415 all_sec = gensec_security_by_oid_list(gensec_security,
416 frame, mech_types,
417 GENSEC_OID_SPNEGO);
418 if (all_sec == NULL) {
419 DBG_WARNING("gensec_security_by_oid_list() failed\n");
420 TALLOC_FREE(frame);
421 return NT_STATUS_INVALID_PARAMETER;
422 }
423
424 for (; all_sec[all_idx].op; all_idx++) {
425 const struct gensec_security_ops_wrapper *cur_sec =
426 &all_sec[all_idx];
427 const char *next = NULL;
428 const char *principal = NULL;
429 int dbg_level = DBGLVL_WARNING;
430 bool allow_fallback = false;
431
432 status = gensec_subcontext_start(spnego_state,
433 gensec_security,
434 &spnego_state->sub_sec_security);
435 if (!NT_STATUS_IS_OK(status)) {
436 TALLOC_FREE(frame);
437 return status;
438 }
439
440 /* select the sub context */
441 status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
442 cur_sec->op);
443 if (!NT_STATUS_IS_OK(status)) {
444 /*
445 * Pretend we never started it.
446 */
447 gensec_spnego_update_sub_abort(spnego_state);
448 continue;
449 }
450
451 spnego_state->neg_oid = cur_sec->oid;
452
453 /*
454 * As client we don't use an optimistic token from the server.
455 */
456 status = gensec_update_ev(spnego_state->sub_sec_security,
457 frame, ev, data_blob_null, &sub_out);
458 if (NT_STATUS_IS_OK(status)) {
459 spnego_state->sub_sec_ready = true;
460 }
461
462 if (!GENSEC_UPDATE_IS_NTERROR(status)) {
463 /* OK or MORE_PROCESSING_REQUIRED */
464 goto reply;
465 }
466
467 /*
468 * it is likely that a NULL input token will
469 * not be liked by most server mechs, but if
470 * we are in the client, we want the first
471 * update packet to be able to abort the use
472 * of this mech
473 */
474 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER) ||
475 NT_STATUS_EQUAL(status, NT_STATUS_NO_LOGON_SERVERS) ||
476 NT_STATUS_EQUAL(status, NT_STATUS_TIME_DIFFERENCE_AT_DC) ||
477 NT_STATUS_EQUAL(status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO))
478 {
479 allow_fallback = true;
480 }
481
482 if (allow_fallback && cur_sec[1].op != NULL) {
483 next = cur_sec[1].op->name;
484 dbg_level = DBGLVL_NOTICE;
485 }
486
487 if (gensec_security->target.principal != NULL) {
488 principal = gensec_security->target.principal;
489 } else if (gensec_security->target.service != NULL &&
490 gensec_security->target.hostname != NULL)
491 {
492 principal = talloc_asprintf(spnego_state->sub_sec_security,
493 "%s/%s",
494 gensec_security->target.service,
495 gensec_security->target.hostname);
496 } else {
497 principal = gensec_security->target.hostname;
498 }
499
500 DBG_PREFIX(dbg_level, (
501 "%s: creating NEG_TOKEN_INIT "
502 "for %s failed (next[%s]): %s\n",
503 spnego_state->sub_sec_security->ops->name,
504 principal, next, nt_errstr(status)));
505
506 if (next == NULL) {
507 /*
508 * A hard error without a possible fallback.
509 */
510 TALLOC_FREE(frame);
511 return status;
512 }
513
514 /*
515 * Pretend we never started it.
516 */
517 gensec_spnego_update_sub_abort(spnego_state);
518 }
519
520 DBG_WARNING("Could not find a suitable mechtype in NEG_TOKEN_INIT\n");
521 TALLOC_FREE(frame);
522 return NT_STATUS_INVALID_PARAMETER;
523
524 reply:
525 my_mechs[0] = spnego_state->neg_oid;
526 /* compose reply */
527 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
528 spnego_out.negTokenInit.mechTypes = my_mechs;
529 spnego_out.negTokenInit.reqFlags = data_blob_null;
530 spnego_out.negTokenInit.reqFlagsPadding = 0;
531 spnego_out.negTokenInit.mechListMIC = data_blob_null;
532 spnego_out.negTokenInit.mechToken = sub_out;
533
534 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
535 DBG_ERR("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n");
536 TALLOC_FREE(frame);
537 return NT_STATUS_INVALID_PARAMETER;
538 }
539
540 ok = spnego_write_mech_types(spnego_state,
541 my_mechs,
542 &spnego_state->mech_types);
543 if (!ok) {
544 DBG_ERR("failed to write mechTypes\n");
545 TALLOC_FREE(frame);
546 return NT_STATUS_NO_MEMORY;
547 }
548
549 /* set next state */
550 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
551 spnego_state->state_position = SPNEGO_CLIENT_TARG;
552
553 TALLOC_FREE(frame);
554 return NT_STATUS_MORE_PROCESSING_REQUIRED;
555 }
556
557 static NTSTATUS gensec_spnego_client_negTokenTarg(struct gensec_security *gensec_security,
558 struct spnego_state *spnego_state,
559 struct tevent_context *ev,
560 struct spnego_data *spnego_in,
561 TALLOC_CTX *out_mem_ctx,
562 DATA_BLOB *out)
563 {
564 struct spnego_negTokenTarg *ta = &spnego_in->negTokenTarg;
565 DATA_BLOB sub_in = ta->responseToken;
566 DATA_BLOB mech_list_mic = data_blob_null;
567 DATA_BLOB sub_out = data_blob_null;
568 struct spnego_data spnego_out;
569 NTSTATUS status;
570
571 *out = data_blob_null;
572
573 spnego_state->num_targs++;
574
575 if (ta->negResult == SPNEGO_REJECT) {
576 return NT_STATUS_LOGON_FAILURE;
577 }
578
579 if (ta->negResult == SPNEGO_REQUEST_MIC) {
580 spnego_state->mic_requested = true;
581 }
582
583 if (ta->mechListMIC.length > 0) {
584 DATA_BLOB *m = &ta->mechListMIC;
585 const DATA_BLOB *r = &ta->responseToken;
586
587 /*
588 * Windows 2000 has a bug, it repeats the
589 * responseToken in the mechListMIC field.
590 */
591 if (m->length == r->length) {
592 int cmp;
593
594 cmp = memcmp(m->data, r->data, m->length);
595 if (cmp == 0) {
596 data_blob_free(m);
597 }
598 }
599 }
600
601 /* Server didn't like our choice of mech, and chose something else */
602 if (((ta->negResult == SPNEGO_ACCEPT_INCOMPLETE) ||
603 (ta->negResult == SPNEGO_REQUEST_MIC)) &&
604 ta->supportedMech != NULL &&
605 strcmp(ta->supportedMech, spnego_state->neg_oid) != 0)
606 {
607 const char *client_mech = NULL;
608 const char *client_oid = NULL;
609 const char *server_mech = NULL;
610 const char *server_oid = NULL;
611
612 client_mech = gensec_get_name_by_oid(gensec_security,
613 spnego_state->neg_oid);
614 client_oid = spnego_state->neg_oid;
615 server_mech = gensec_get_name_by_oid(gensec_security,
616 ta->supportedMech);
617 server_oid = ta->supportedMech;
618
619 DBG_NOTICE("client preferred mech (%s[%s]) not accepted, "
620 "server wants: %s[%s]\n",
621 client_mech, client_oid, server_mech, server_oid);
622
623 spnego_state->downgraded = true;
624 gensec_spnego_update_sub_abort(spnego_state);
625
626 status = gensec_subcontext_start(spnego_state,
627 gensec_security,
628 &spnego_state->sub_sec_security);
629 if (!NT_STATUS_IS_OK(status)) {
630 return status;
631 }
632
633 /* select the sub context */
634 status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
635 ta->supportedMech);
636 if (!NT_STATUS_IS_OK(status)) {
637 return status;
638 }
639
640 spnego_state->neg_oid = talloc_strdup(spnego_state,
641 ta->supportedMech);
642 if (spnego_state->neg_oid == NULL) {
643 return NT_STATUS_NO_MEMORY;
644 }
645 }
646
647 if (ta->mechListMIC.length > 0) {
648 if (spnego_state->sub_sec_ready) {
649 spnego_state->needs_mic_check = true;
650 }
651 }
652
653 if (spnego_state->needs_mic_check) {
654 if (ta->responseToken.length != 0) {
655 DBG_WARNING("non empty response token not expected\n");
656 return NT_STATUS_INVALID_PARAMETER;
657 }
658
659 if (ta->mechListMIC.length == 0
660 && spnego_state->may_skip_mic_check) {
661 /*
662 * In this case we don't require
663 * a mechListMIC from the server.
664 *
665 * This works around bugs in the Azure
666 * and Apple spnego implementations.
667 *
668 * See
669 * https://bugzilla.samba.org/show_bug.cgi?id=11994
670 */
671 spnego_state->needs_mic_check = false;
672 status = NT_STATUS_OK;
673 goto client_response;
674 }
675
676 status = gensec_check_packet(spnego_state->sub_sec_security,
677 spnego_state->mech_types.data,
678 spnego_state->mech_types.length,
679 spnego_state->mech_types.data,
680 spnego_state->mech_types.length,
681 &ta->mechListMIC);
682 if (!NT_STATUS_IS_OK(status)) {
683 DBG_WARNING("failed to verify mechListMIC: %s\n",
684 nt_errstr(status));
685 return status;
686 }
687 spnego_state->needs_mic_check = false;
688 spnego_state->done_mic_check = true;
689 goto client_response;
690 }
691
692 if (!spnego_state->sub_sec_ready) {
693 status = gensec_update_ev(spnego_state->sub_sec_security,
694 out_mem_ctx, ev,
695 sub_in,
696 &sub_out);
697 if (NT_STATUS_IS_OK(status)) {
698 spnego_state->sub_sec_ready = true;
699 }
700 if (!NT_STATUS_IS_OK(status)) {
701 goto client_response;
702 }
703 } else {
704 status = NT_STATUS_OK;
705 }
706
707 if (!spnego_state->done_mic_check) {
708 bool have_sign = true;
709 bool new_spnego = false;
710
711 have_sign = gensec_have_feature(spnego_state->sub_sec_security,
712 GENSEC_FEATURE_SIGN);
713 if (spnego_state->simulate_w2k) {
714 have_sign = false;
715 }
716 new_spnego = gensec_have_feature(spnego_state->sub_sec_security,
717 GENSEC_FEATURE_NEW_SPNEGO);
718
719 switch (ta->negResult) {
720 case SPNEGO_ACCEPT_COMPLETED:
721 case SPNEGO_NONE_RESULT:
722 if (spnego_state->num_targs == 1) {
723 /*
724 * the first exchange doesn't require
725 * verification
726 */
727 new_spnego = false;
728 }
729
730 break;
731
732 case SPNEGO_ACCEPT_INCOMPLETE:
733 if (ta->mechListMIC.length > 0) {
734 new_spnego = true;
735 break;
736 }
737
738 if (spnego_state->downgraded) {
739 /*
740 * A downgrade should be protected if
741 * supported
742 */
743 break;
744 }
745
746 /*
747 * The caller may just asked for
748 * GENSEC_FEATURE_SESSION_KEY, this
749 * is only reflected in the want_features.
750 *
751 * As it will imply
752 * gensec_have_features(GENSEC_FEATURE_SIGN)
753 * to return true.
754 */
755 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
756 break;
757 }
758 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
759 break;
760 }
761 /*
762 * Here we're sure our preferred mech was
763 * selected by the server and our caller doesn't
764 * need GENSEC_FEATURE_SIGN nor
765 * GENSEC_FEATURE_SEAL support.
766 *
767 * In this case we don't require
768 * a mechListMIC from the server.
769 *
770 * This works around bugs in the Azure
771 * and Apple spnego implementations.
772 *
773 * See
774 * https://bugzilla.samba.org/show_bug.cgi?id=11994
775 */
776 spnego_state->may_skip_mic_check = true;
777 break;
778
779 case SPNEGO_REQUEST_MIC:
780 if (ta->mechListMIC.length > 0) {
781 new_spnego = true;
782 }
783 break;
784 default:
785 break;
786 }
787
788 if (spnego_state->mic_requested) {
789 if (have_sign) {
790 new_spnego = true;
791 }
792 }
793
794 if (have_sign && new_spnego) {
795 spnego_state->needs_mic_check = true;
796 spnego_state->needs_mic_sign = true;
797 }
798 }
799
800 if (ta->mechListMIC.length > 0) {
801 status = gensec_check_packet(spnego_state->sub_sec_security,
802 spnego_state->mech_types.data,
803 spnego_state->mech_types.length,
804 spnego_state->mech_types.data,
805 spnego_state->mech_types.length,
806 &ta->mechListMIC);
807 if (!NT_STATUS_IS_OK(status)) {
808 DBG_WARNING("failed to verify mechListMIC: %s\n",
809 nt_errstr(status));
810 return status;
811 }
812 spnego_state->needs_mic_check = false;
813 spnego_state->done_mic_check = true;
814 }
815
816 if (spnego_state->needs_mic_sign) {
817 status = gensec_sign_packet(spnego_state->sub_sec_security,
818 out_mem_ctx,
819 spnego_state->mech_types.data,
820 spnego_state->mech_types.length,
821 spnego_state->mech_types.data,
822 spnego_state->mech_types.length,
823 &mech_list_mic);
824 if (!NT_STATUS_IS_OK(status)) {
825 DBG_WARNING("failed to sign mechListMIC: %s\n",
826 nt_errstr(status));
827 return status;
828 }
829 spnego_state->needs_mic_sign = false;
830 }
831
832 client_response:
833 if (GENSEC_UPDATE_IS_NTERROR(status)) {
834 DBG_WARNING("SPNEGO(%s) login failed: %s\n",
835 spnego_state->sub_sec_security->ops->name,
836 nt_errstr(status));
837 return status;
838 }
839
840 if (sub_out.length == 0 && mech_list_mic.length == 0) {
841 *out = data_blob_null;
842
843 if (!spnego_state->sub_sec_ready) {
844 /* somethings wrong here... */
845 DBG_ERR("gensec_update not ready without output\n");
846 return NT_STATUS_INTERNAL_ERROR;
847 }
848
849 if (ta->negResult != SPNEGO_ACCEPT_COMPLETED) {
850 /* unless of course it did not accept */
851 DBG_WARNING("gensec_update ok but not accepted\n");
852 return NT_STATUS_INVALID_PARAMETER;
853 }
854
855 if (!spnego_state->needs_mic_check) {
856 spnego_state->state_position = SPNEGO_DONE;
857 return NT_STATUS_OK;
858 }
859 }
860
861 /* compose reply */
862 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
863 spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
864 spnego_out.negTokenTarg.supportedMech = NULL;
865 spnego_out.negTokenTarg.responseToken = sub_out;
866 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
867
868 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
869 DBG_WARNING("Failed to write NEG_TOKEN_TARG\n");
870 return NT_STATUS_INVALID_PARAMETER;
871 }
872
873 spnego_state->num_targs++;
874
875 /* set next state */
876 spnego_state->state_position = SPNEGO_CLIENT_TARG;
877 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
878
879 return NT_STATUS_MORE_PROCESSING_REQUIRED;
880 }
881
882 /** create a server negTokenTarg
883 *
884 * This is the case, where the client is the first one who sends data
885 */
886
887 static NTSTATUS gensec_spnego_server_response(struct spnego_state *spnego_state,
888 TALLOC_CTX *out_mem_ctx,
889 NTSTATUS nt_status,
890 const DATA_BLOB unwrapped_out,
891 DATA_BLOB mech_list_mic,
892 DATA_BLOB *out)
893 {
894 struct spnego_data spnego_out;
895
896 /* compose reply */
897 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
898 spnego_out.negTokenTarg.responseToken = unwrapped_out;
899 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
900 spnego_out.negTokenTarg.supportedMech = NULL;
901
902 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
903 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
904 if (spnego_state->mic_requested) {
905 spnego_out.negTokenTarg.negResult = SPNEGO_REQUEST_MIC;
906 spnego_state->mic_requested = false;
907 } else {
908 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
909 }
910 spnego_state->state_position = SPNEGO_SERVER_TARG;
911 } else if (NT_STATUS_IS_OK(nt_status)) {
912 if (unwrapped_out.data) {
913 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
914 }
915 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
916 spnego_state->state_position = SPNEGO_DONE;
917 } else {
918 spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
919 spnego_out.negTokenTarg.mechListMIC = data_blob_null;
920 DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
921 spnego_state->state_position = SPNEGO_DONE;
922 }
923
924 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
925 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
926 return NT_STATUS_INVALID_PARAMETER;
927 }
928
929 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
930 spnego_state->num_targs++;
931
932 return nt_status;
933 }
934
935 static NTSTATUS gensec_spnego_server_negTokenInit(struct gensec_security *gensec_security,
936 struct spnego_state *spnego_state,
937 struct tevent_context *ev,
938 struct spnego_data *spnego_in,
939 TALLOC_CTX *out_mem_ctx,
940 DATA_BLOB *out)
941 {
942 TALLOC_CTX *frame = talloc_stackframe();
943 DATA_BLOB sub_out = data_blob_null;
944 DATA_BLOB mech_list_mic = data_blob_null;
945 const char * const *mech_types = NULL;
946 size_t all_idx = 0;
947 const struct gensec_security_ops_wrapper *all_sec = NULL;
948 size_t mech_idx = 0;
949 NTSTATUS status;
950 bool ok;
951
952 mech_types = spnego_in->negTokenInit.mechTypes;
953 if (mech_types == NULL) {
954 TALLOC_FREE(frame);
955 return NT_STATUS_INVALID_PARAMETER;
956 }
957
958 all_sec = gensec_security_by_oid_list(gensec_security, frame,
959 mech_types, GENSEC_OID_SPNEGO);
960 if (all_sec == NULL) {
961 DBG_WARNING("gensec_security_by_oid_list() failed\n");
962 TALLOC_FREE(frame);
963 return NT_STATUS_INVALID_PARAMETER;
964 }
965
966 ok = spnego_write_mech_types(spnego_state, mech_types,
967 &spnego_state->mech_types);
968 if (!ok) {
969 DBG_ERR("Failed to write mechTypes\n");
970 TALLOC_FREE(frame);
971 return NT_STATUS_NO_MEMORY;
972 }
973
974 /*
975 * First try the preferred mechs from the client.
976 */
977 for (; mech_types[mech_idx]; mech_idx++) {
978 const char *cur_mech = mech_types[mech_idx];
979 const struct gensec_security_ops_wrapper *cur_sec = NULL;
980 DATA_BLOB sub_in = data_blob_null;
981
982 for (all_idx = 0; all_sec[all_idx].op; all_idx++) {
983 if (strcmp(cur_mech, all_sec[all_idx].oid) == 0) {
984 cur_sec = &all_sec[all_idx];
985 break;
986 }
987 }
988
989 if (cur_sec == NULL) {
990 continue;
991 }
992
993 status = gensec_subcontext_start(spnego_state,
994 gensec_security,
995 &spnego_state->sub_sec_security);
996 if (!NT_STATUS_IS_OK(status)) {
997 TALLOC_FREE(frame);
998 return status;
999 }
1000
1001 /* select the sub context */
1002 status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
1003 cur_sec->op);
1004 if (!NT_STATUS_IS_OK(status)) {
1005 /*
1006 * Pretend we never started it
1007 */
1008 gensec_spnego_update_sub_abort(spnego_state);
1009 continue;
1010 }
1011
1012 if (mech_idx > 0) {
1013 /*
1014 * Indicate the downgrade and request a
1015 * mic.
1016 */
1017 spnego_state->downgraded = true;
1018 spnego_state->mic_requested = true;
1019 /* no optimistic token */
1020 spnego_state->neg_oid = cur_sec->oid;
1021 sub_out = data_blob_null;
1022 status = NT_STATUS_MORE_PROCESSING_REQUIRED;
1023 goto reply;
1024 }
1025
1026 /*
1027 * Try the optimistic token from the client
1028 */
1029 sub_in = spnego_in->negTokenInit.mechToken;
1030 status = gensec_update_ev(spnego_state->sub_sec_security,
1031 frame, ev, sub_in, &sub_out);
1032 if (NT_STATUS_IS_OK(status)) {
1033 spnego_state->sub_sec_ready = true;
1034 }
1035 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER) ||
1036 NT_STATUS_EQUAL(status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
1037
1038 DBG_WARNING("%s: NEG_TOKEN_INIT failed to parse contents: %s\n",
1039 cur_sec->op->name, nt_errstr(status));
1040
1041 /*
1042 * Pretend we never started it
1043 */
1044 gensec_spnego_update_sub_abort(spnego_state);
1045 continue;
1046 }
1047
1048 if (GENSEC_UPDATE_IS_NTERROR(status)) {
1049 DBG_WARNING("%s: NEG_TOKEN_INIT failed: %s\n",
1050 cur_sec->op->name, nt_errstr(status));
1051 goto reply;
1052 }
1053
1054 spnego_state->neg_oid = cur_sec->oid;
1055 goto reply; /* OK or MORE PROCESSING */
1056 }
1057
1058 DBG_WARNING("Could not find a suitable mechtype in NEG_TOKEN_INIT\n");
1059 status = NT_STATUS_INVALID_PARAMETER;
1060
1061 reply:
1062 if (spnego_state->simulate_w2k) {
1063 /*
1064 * Windows 2000 returns the unwrapped token
1065 * also in the mech_list_mic field.
1066 *
1067 * In order to verify our client code,
1068 * we need a way to have a server with this
1069 * broken behaviour
1070 */
1071 mech_list_mic = sub_out;
1072 }
1073
1074 status = gensec_spnego_server_response(spnego_state,
1075 out_mem_ctx,
1076 status,
1077 sub_out,
1078 mech_list_mic,
1079 out);
1080 TALLOC_FREE(frame);
1081 return status;
1082 }
1083
1084 static NTSTATUS gensec_spnego_server_negTokenTarg(struct gensec_security *gensec_security,
1085 struct spnego_state *spnego_state,
1086 struct tevent_context *ev,
1087 struct spnego_data *spnego_in,
1088 TALLOC_CTX *out_mem_ctx,
1089 DATA_BLOB *out)
1090 {
1091 const struct spnego_negTokenTarg *ta = &spnego_in->negTokenTarg;
1092 DATA_BLOB sub_in = ta->responseToken;
1093 DATA_BLOB mech_list_mic = data_blob_null;
1094 DATA_BLOB sub_out = data_blob_null;
1095 NTSTATUS status;
1096 bool have_sign = true;
1097 bool new_spnego = false;
1098
1099 spnego_state->num_targs++;
1100
1101 if (spnego_state->sub_sec_security == NULL) {
1102 DBG_ERR("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n");
1103 return NT_STATUS_INVALID_PARAMETER;
1104 }
1105
1106 if (spnego_state->needs_mic_check) {
1107 if (ta->responseToken.length != 0) {
1108 DBG_WARNING("non empty response token not expected\n");
1109 return NT_STATUS_INVALID_PARAMETER;
1110 }
1111
1112 status = gensec_check_packet(spnego_state->sub_sec_security,
1113 spnego_state->mech_types.data,
1114 spnego_state->mech_types.length,
1115 spnego_state->mech_types.data,
1116 spnego_state->mech_types.length,
1117 &ta->mechListMIC);
1118 if (!NT_STATUS_IS_OK(status)) {
1119 DBG_WARNING("failed to verify mechListMIC: %s\n",
1120 nt_errstr(status));
1121 goto server_response;
1122 }
1123
1124 spnego_state->needs_mic_check = false;
1125 spnego_state->done_mic_check = true;
1126 goto server_response;
1127 }
1128
1129 if (!spnego_state->sub_sec_ready) {
1130 status = gensec_update_ev(spnego_state->sub_sec_security,
1131 out_mem_ctx, ev,
1132 sub_in, &sub_out);
1133 if (NT_STATUS_IS_OK(status)) {
1134 spnego_state->sub_sec_ready = true;
1135 }
1136 if (!NT_STATUS_IS_OK(status)) {
1137 goto server_response;
1138 }
1139 } else {
1140 status = NT_STATUS_OK;
1141 }
1142
1143 have_sign = gensec_have_feature(spnego_state->sub_sec_security,
1144 GENSEC_FEATURE_SIGN);
1145 if (spnego_state->simulate_w2k) {
1146 have_sign = false;
1147 }
1148 new_spnego = gensec_have_feature(spnego_state->sub_sec_security,
1149 GENSEC_FEATURE_NEW_SPNEGO);
1150 if (ta->mechListMIC.length > 0) {
1151 new_spnego = true;
1152 }
1153
1154 if (have_sign && new_spnego) {
1155 spnego_state->needs_mic_check = true;
1156 spnego_state->needs_mic_sign = true;
1157 }
1158
1159 if (have_sign && ta->mechListMIC.length > 0) {
1160 status = gensec_check_packet(spnego_state->sub_sec_security,
1161 spnego_state->mech_types.data,
1162 spnego_state->mech_types.length,
1163 spnego_state->mech_types.data,
1164 spnego_state->mech_types.length,
1165 &ta->mechListMIC);
1166 if (!NT_STATUS_IS_OK(status)) {
1167 DBG_WARNING("failed to verify mechListMIC: %s\n",
1168 nt_errstr(status));
1169 goto server_response;
1170 }
1171
1172 spnego_state->needs_mic_check = false;
1173 spnego_state->done_mic_check = true;
1174 }
1175
1176 if (spnego_state->needs_mic_sign) {
1177 status = gensec_sign_packet(spnego_state->sub_sec_security,
1178 out_mem_ctx,
1179 spnego_state->mech_types.data,
1180 spnego_state->mech_types.length,
1181 spnego_state->mech_types.data,
1182 spnego_state->mech_types.length,
1183 &mech_list_mic);
1184 if (!NT_STATUS_IS_OK(status)) {
1185 DBG_WARNING("failed to sign mechListMIC: %s\n",
1186 nt_errstr(status));
1187 return status;
1188 }
1189 spnego_state->needs_mic_sign = false;
1190 }
1191
1192 if (spnego_state->needs_mic_check) {
1193 status = NT_STATUS_MORE_PROCESSING_REQUIRED;
1194 }
1195
1196 server_response:
1197 return gensec_spnego_server_response(spnego_state,
1198 out_mem_ctx,
1199 status,
1200 sub_out,
1201 mech_list_mic,
1202 out);
1203 }
1204
1205 struct gensec_spnego_update_state {
1206 struct tevent_context *ev;
1207 struct gensec_security *gensec;
1208 struct spnego_state *spnego;
1209
1210 DATA_BLOB full_in;
1211 struct spnego_data _spnego_in;
1212 struct spnego_data *spnego_in;
1213
1214 struct {
1215 bool needed;
1216 DATA_BLOB in;
1217 NTSTATUS status;
1218 DATA_BLOB out;
1219 } sub;
1220
1221 NTSTATUS status;
1222 DATA_BLOB out;
1223 };
1224
1225 static void gensec_spnego_update_cleanup(struct tevent_req *req,
1226 enum tevent_req_state req_state)
1227 {
1228 struct gensec_spnego_update_state *state =
1229 tevent_req_data(req,
1230 struct gensec_spnego_update_state);
1231
1232 switch (req_state) {
1233 case TEVENT_REQ_USER_ERROR:
1234 case TEVENT_REQ_TIMED_OUT:
1235 case TEVENT_REQ_NO_MEMORY:
1236 /*
1237 * A fatal error, further updates are not allowed.
1238 */
1239 state->spnego->state_position = SPNEGO_DONE;
1240 break;
1241 default:
1242 break;
1243 }
1244 }
1245
1246 static NTSTATUS gensec_spnego_update_in(struct gensec_security *gensec_security,
1247 const DATA_BLOB in, TALLOC_CTX *mem_ctx,
1248 DATA_BLOB *full_in);
1249 static void gensec_spnego_update_pre(struct tevent_req *req);
1250 static void gensec_spnego_update_done(struct tevent_req *subreq);
1251 static void gensec_spnego_update_post(struct tevent_req *req);
1252 static NTSTATUS gensec_spnego_update_out(struct gensec_security *gensec_security,
1253 TALLOC_CTX *out_mem_ctx,
1254 DATA_BLOB *_out);
1255
1256 static struct tevent_req *gensec_spnego_update_send(TALLOC_CTX *mem_ctx,
1257 struct tevent_context *ev,
1258 struct gensec_security *gensec_security,
1259 const DATA_BLOB in)
1260 {
1261 struct spnego_state *spnego_state =
1262 talloc_get_type_abort(gensec_security->private_data,
1263 struct spnego_state);
1264 struct tevent_req *req = NULL;
1265 struct gensec_spnego_update_state *state = NULL;
1266 NTSTATUS status;
1267 ssize_t len;
1268
1269 req = tevent_req_create(mem_ctx, &state,
1270 struct gensec_spnego_update_state);
1271 if (req == NULL) {
1272 return NULL;
1273 }
1274 state->ev = ev;
1275 state->gensec = gensec_security;
1276 state->spnego = spnego_state;
1277 tevent_req_set_cleanup_fn(req, gensec_spnego_update_cleanup);
1278
1279 if (spnego_state->out_frag.length > 0) {
1280 if (in.length > 0) {
1281 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
1282 return tevent_req_post(req, ev);
1283 }
1284
1285 status = gensec_spnego_update_out(gensec_security,
1286 state, &state->out);
1287 if (GENSEC_UPDATE_IS_NTERROR(status)) {
1288 tevent_req_nterror(req, status);
1289 return tevent_req_post(req, ev);
1290 }
1291
1292 state->status = status;
1293 tevent_req_done(req);
1294 return tevent_req_post(req, ev);
1295 }
1296
1297 status = gensec_spnego_update_in(gensec_security, in,
1298 state, &state->full_in);
1299 state->status = status;
1300 if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
1301 tevent_req_done(req);
1302 return tevent_req_post(req, ev);
1303 }
1304 if (tevent_req_nterror(req, status)) {
1305 return tevent_req_post(req, ev);
1306 }
1307
1308 /* Check if we got a valid SPNEGO blob... */
1309
1310 switch (spnego_state->state_position) {
1311 case SPNEGO_FALLBACK:
1312 break;
1313
1314 case SPNEGO_CLIENT_TARG:
1315 case SPNEGO_SERVER_TARG:
1316 if (state->full_in.length == 0) {
1317 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
1318 return tevent_req_post(req, ev);
1319 }
1320
1321 /* fall through */
1322 case SPNEGO_CLIENT_START:
1323 case SPNEGO_SERVER_START:
1324
1325 if (state->full_in.length == 0) {
1326 /* create_negTokenInit later */
1327 break;
1328 }
1329
1330 len = spnego_read_data(state,
1331 state->full_in,
1332 &state->_spnego_in);
1333 if (len == -1) {
1334 if (spnego_state->state_position != SPNEGO_SERVER_START) {
1335 DEBUG(1, ("Invalid SPNEGO request:\n"));
1336 dump_data(1, state->full_in.data,
1337 state->full_in.length);
1338 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
1339 return tevent_req_post(req, ev);
1340 }
1341
1342 /*
1343 * This is the 'fallback' case, where we don't get
1344 * SPNEGO, and have to try all the other options (and
1345 * hope they all have a magic string they check)
1346 */
1347 status = gensec_spnego_server_try_fallback(gensec_security,
1348 spnego_state,
1349 state,
1350 state->full_in);
1351 if (tevent_req_nterror(req, status)) {
1352 return tevent_req_post(req, ev);
1353 }
1354
1355 /*
1356 * We'll continue with SPNEGO_FALLBACK below...
1357 */
1358 break;
1359 }
1360 state->spnego_in = &state->_spnego_in;
1361
1362 /* OK, so it's real SPNEGO, check the packet's the one we expect */
1363 if (state->spnego_in->type != spnego_state->expected_packet) {
1364 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n",
1365 state->spnego_in->type,
1366 spnego_state->expected_packet));
1367 dump_data(1, state->full_in.data,
1368 state->full_in.length);
1369 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
1370 return tevent_req_post(req, ev);
1371 }
1372
1373 break;
1374
1375 default:
1376 smb_panic(__location__);
1377 return NULL;
1378 }
1379
1380 gensec_spnego_update_pre(req);
1381 if (!tevent_req_is_in_progress(req)) {
1382 return tevent_req_post(req, ev);
1383 }
1384
1385 if (state->sub.needed) {
1386 struct tevent_req *subreq = NULL;
1387
1388 /*
1389 * We may need one more roundtrip...
1390 */
1391 subreq = gensec_update_send(state, state->ev,
1392 spnego_state->sub_sec_security,
1393 state->sub.in);
1394 if (tevent_req_nomem(subreq, req)) {
1395 return tevent_req_post(req, ev);
1396 }
1397 tevent_req_set_callback(subreq,
1398 gensec_spnego_update_done,
1399 req);
1400 state->sub.needed = false;
1401 return req;
1402 }
1403
1404 gensec_spnego_update_post(req);
1405 if (!tevent_req_is_in_progress(req)) {
1406 return tevent_req_post(req, ev);
1407 }
1408
1409 return req;
1410 }
1411
1412 static NTSTATUS gensec_spnego_update_in(struct gensec_security *gensec_security,
1413 const DATA_BLOB in, TALLOC_CTX *mem_ctx,
1414 DATA_BLOB *full_in)
1415 {
1416 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1417 size_t expected;
1418 bool ok;
1419
1420 *full_in = data_blob_null;
1421
1422 switch (spnego_state->state_position) {
1423 case SPNEGO_FALLBACK:
1424 *full_in = in;
1425 spnego_state->in_needed = 0;
1426 return NT_STATUS_OK;
1427
1428 case SPNEGO_CLIENT_START:
1429 case SPNEGO_CLIENT_TARG:
1430 case SPNEGO_SERVER_START:
1431 case SPNEGO_SERVER_TARG:
1432 break;
1433
1434 case SPNEGO_DONE:
1435 default:
1436 return NT_STATUS_INVALID_PARAMETER;
1437 }
1438
1439 if (spnego_state->in_needed == 0) {
1440 size_t size = 0;
1441 int ret;
1442
1443 /*
1444 * try to work out the size of the full
1445 * input token, it might be fragmented
1446 */
1447 ret = asn1_peek_full_tag(in, ASN1_APPLICATION(0), &size);
1448 if ((ret != 0) && (ret != EAGAIN)) {
1449 ret = asn1_peek_full_tag(in, ASN1_CONTEXT(1), &size);
1450 }
1451
1452 if ((ret == 0) || (ret == EAGAIN)) {
1453 spnego_state->in_needed = size;
1454 } else {
1455 /*
1456 * If it is not an asn1 message
1457 * just call the next layer.
1458 */
1459 spnego_state->in_needed = in.length;
1460 }
1461 }
1462
1463 if (spnego_state->in_needed > UINT16_MAX) {
1464 /*
1465 * limit the incoming message to 0xFFFF
1466 * to avoid DoS attacks.
1467 */
1468 return NT_STATUS_INVALID_BUFFER_SIZE;
1469 }
1470
1471 if ((spnego_state->in_needed > 0) && (in.length == 0)) {
1472 /*
1473 * If we reach this, we know we got at least
1474 * part of an asn1 message, getting 0 means
1475 * the remote peer wants us to spin.
1476 */
1477 return NT_STATUS_INVALID_PARAMETER;
1478 }
1479
1480 expected = spnego_state->in_needed - spnego_state->in_frag.length;
1481 if (in.length > expected) {
1482 /*
1483 * we got more than expected
1484 */
1485 return NT_STATUS_INVALID_PARAMETER;
1486 }
1487
1488 if (in.length == spnego_state->in_needed) {
1489 /*
1490 * if the in.length contains the full blob
1491 * we are done.
1492 *
1493 * Note: this implies spnego_state->in_frag.length == 0,
1494 * but we do not need to check this explicitly
1495 * because we already know that we did not get
1496 * more than expected.
1497 */
1498 *full_in = in;
1499 spnego_state->in_needed = 0;
1500 return NT_STATUS_OK;
1501 }
1502
1503 ok = data_blob_append(spnego_state, &spnego_state->in_frag,
1504 in.data, in.length);
1505 if (!ok) {
1506 return NT_STATUS_NO_MEMORY;
1507 }
1508
1509 if (spnego_state->in_needed > spnego_state->in_frag.length) {
1510 return NT_STATUS_MORE_PROCESSING_REQUIRED;
1511 }
1512
1513 *full_in = spnego_state->in_frag;
1514 talloc_steal(mem_ctx, full_in->data);
1515 spnego_state->in_frag = data_blob_null;
1516 spnego_state->in_needed = 0;
1517 return NT_STATUS_OK;
1518 }
1519
1520 static void gensec_spnego_update_pre(struct tevent_req *req)
1521 {
1522 struct gensec_spnego_update_state *state =
1523 tevent_req_data(req,
1524 struct gensec_spnego_update_state);
1525 struct gensec_security *gensec_security = state->gensec;
1526 struct spnego_state *spnego_state = state->spnego;
1527 struct tevent_context *ev = state->ev;
1528 NTSTATUS status;
1529
1530 state->sub.needed = false;
1531 state->sub.in = data_blob_null;
1532 state->sub.status = NT_STATUS_INTERNAL_ERROR;
1533 state->sub.out = data_blob_null;
1534
1535 if (spnego_state->state_position == SPNEGO_FALLBACK) {
1536 state->sub.in = state->full_in;
1537 state->full_in = data_blob_null;
1538 state->sub.needed = true;
1539 return;
1540 }
1541
1542 switch (spnego_state->state_position) {
1543 case SPNEGO_CLIENT_START:
1544 if (state->spnego_in == NULL) {
1545 /* client to produce negTokenInit */
1546 status = gensec_spnego_create_negTokenInit(gensec_security,
1547 spnego_state, state, ev,
1548 &spnego_state->out_frag);
1549 if (GENSEC_UPDATE_IS_NTERROR(status)) {
1550 tevent_req_nterror(req, status);
1551 return;
1552 }
1553 break;
1554 }
1555
1556 status = gensec_spnego_client_negTokenInit(gensec_security,
1557 spnego_state, ev,
1558 state->spnego_in, state,
1559 &spnego_state->out_frag);
1560 break;
1561
1562 case SPNEGO_CLIENT_TARG:
1563 status = gensec_spnego_client_negTokenTarg(gensec_security,
1564 spnego_state, ev,
1565 state->spnego_in, state,
1566 &spnego_state->out_frag);
1567 if (GENSEC_UPDATE_IS_NTERROR(status)) {
1568 tevent_req_nterror(req, status);
1569 return;
1570 }
1571 break;
1572
1573 case SPNEGO_SERVER_START:
1574 if (state->spnego_in == NULL) {
1575 /* server to produce negTokenInit */
1576 status = gensec_spnego_create_negTokenInit(gensec_security,
1577 spnego_state, state, ev,
1578 &spnego_state->out_frag);
1579 if (GENSEC_UPDATE_IS_NTERROR(status)) {
1580 tevent_req_nterror(req, status);
1581 return;
1582 }
1583 break;
1584 }
1585
1586 status = gensec_spnego_server_negTokenInit(gensec_security,
1587 spnego_state, ev,
1588 state->spnego_in, state,
1589 &spnego_state->out_frag);
1590 if (GENSEC_UPDATE_IS_NTERROR(status)) {
1591 tevent_req_nterror(req, status);
1592 return;
1593 }
1594 break;
1595
1596 case SPNEGO_SERVER_TARG:
1597 status = gensec_spnego_server_negTokenTarg(gensec_security,
1598 spnego_state, ev,
1599 state->spnego_in, state,
1600 &spnego_state->out_frag);
1601 if (GENSEC_UPDATE_IS_NTERROR(status)) {
1602 tevent_req_nterror(req, status);
1603 return;
1604 }
1605 break;
1606
1607 default:
1608 smb_panic(__location__);
1609 return;
1610 }
1611
1612 spnego_state->out_status = status;
1613 }
1614
1615 static void gensec_spnego_update_done(struct tevent_req *subreq)
1616 {
1617 struct tevent_req *req =
1618 tevent_req_callback_data(subreq,
1619 struct tevent_req);
1620 struct gensec_spnego_update_state *state =
1621 tevent_req_data(req,
1622 struct gensec_spnego_update_state);
1623 struct spnego_state *spnego_state = state->spnego;
1624
1625 state->sub.status = gensec_update_recv(subreq, state, &state->sub.out);
1626 TALLOC_FREE(subreq);
1627 if (NT_STATUS_IS_OK(state->sub.status)) {
1628 spnego_state->sub_sec_ready = true;
1629 }
1630
1631 gensec_spnego_update_post(req);
1632 }
1633
1634 static void gensec_spnego_update_post(struct tevent_req *req)
1635 {
1636 struct gensec_spnego_update_state *state =
1637 tevent_req_data(req,
1638 struct gensec_spnego_update_state);
1639 struct spnego_state *spnego_state = state->spnego;
1640 NTSTATUS status;
1641
1642 state->sub.in = data_blob_null;
1643 state->sub.needed = false;
1644
1645 if (spnego_state->state_position == SPNEGO_FALLBACK) {
1646 status = state->sub.status;
1647 spnego_state->out_frag = state->sub.out;
1648 talloc_steal(spnego_state, spnego_state->out_frag.data);
1649 state->sub.out = data_blob_null;
1650 goto respond;
1651 }
1652
1653 /*
1654 * For now just handle the sync processing done
1655 * in gensec_spnego_update_pre()
1656 */
1657 status = spnego_state->out_status;
1658
1659 if (NT_STATUS_IS_OK(status)) {
1660 bool reset_full = true;
1661
1662 reset_full = !spnego_state->done_mic_check;
1663
1664 status = gensec_may_reset_crypto(spnego_state->sub_sec_security,
1665 reset_full);
1666 if (tevent_req_nterror(req, status)) {
1667 return;
1668 }
1669 }
1670
1671 respond:
1672 spnego_state->out_status = status;
1673
1674 status = gensec_spnego_update_out(state->gensec,
1675 state, &state->out);
1676 if (GENSEC_UPDATE_IS_NTERROR(status)) {
1677 tevent_req_nterror(req, status);
1678 return;
1679 }
1680
1681 state->status = status;
1682 tevent_req_done(req);
1683 return;
1684 }
1685
1686 static NTSTATUS gensec_spnego_update_out(struct gensec_security *gensec_security,
1687 TALLOC_CTX *out_mem_ctx,
1688 DATA_BLOB *_out)
1689 {
1690 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1691 DATA_BLOB out = data_blob_null;
1692 bool ok;
1693
1694 *_out = data_blob_null;
1695
1696 if (spnego_state->out_frag.length <= spnego_state->out_max_length) {
1697 /*
1698 * Fast path, we can deliver everything
1699 */
1700
1701 *_out = spnego_state->out_frag;
1702 if (spnego_state->out_frag.length > 0) {
1703 talloc_steal(out_mem_ctx, _out->data);
1704 spnego_state->out_frag = data_blob_null;
1705 }
1706
1707 if (!NT_STATUS_IS_OK(spnego_state->out_status)) {
1708 return spnego_state->out_status;
1709 }
1710
1711 /*
1712 * We're completely done, further updates are not allowed.
1713 */
1714 spnego_state->state_position = SPNEGO_DONE;
1715 return gensec_child_ready(gensec_security,
1716 spnego_state->sub_sec_security);
1717 }
1718
1719 out = spnego_state->out_frag;
1720
1721 /*
1722 * copy the remaining bytes
1723 */
1724 spnego_state->out_frag = data_blob_talloc(spnego_state,
1725 out.data + spnego_state->out_max_length,
1726 out.length - spnego_state->out_max_length);
1727 if (spnego_state->out_frag.data == NULL) {
1728 return NT_STATUS_NO_MEMORY;
1729 }
1730
1731 /*
1732 * truncate the buffer
1733 */
1734 ok = data_blob_realloc(spnego_state, &out,
1735 spnego_state->out_max_length);
1736 if (!ok) {
1737 return NT_STATUS_NO_MEMORY;
1738 }
1739
1740 talloc_steal(out_mem_ctx, out.data);
1741 *_out = out;
1742 return NT_STATUS_MORE_PROCESSING_REQUIRED;
1743 }
1744
1745 static NTSTATUS gensec_spnego_update_recv(struct tevent_req *req,
1746 TALLOC_CTX *out_mem_ctx,
1747 DATA_BLOB *out)
1748 {
1749 struct gensec_spnego_update_state *state =
1750 tevent_req_data(req,
1751 struct gensec_spnego_update_state);
1752 NTSTATUS status;
1753
1754 *out = data_blob_null;
1755
1756 if (tevent_req_is_nterror(req, &status)) {
1757 tevent_req_received(req);
1758 return status;
1759 }
1760
1761 *out = state->out;
1762 talloc_steal(out_mem_ctx, state->out.data);
1763 status = state->status;
1764 tevent_req_received(req);
1765 return status;
1766 }
1767
1768 static const char *gensec_spnego_oids[] = {
1769 GENSEC_OID_SPNEGO,
1770 NULL
1771 };
1772
1773 static const struct gensec_security_ops gensec_spnego_security_ops = {
1774 .name = "spnego",
1775 .sasl_name = "GSS-SPNEGO",
1776 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1777 .oid = gensec_spnego_oids,
1778 .client_start = gensec_spnego_client_start,
1779 .server_start = gensec_spnego_server_start,
1780 .update_send = gensec_spnego_update_send,
1781 .update_recv = gensec_spnego_update_recv,
1782 .seal_packet = gensec_child_seal_packet,
1783 .sign_packet = gensec_child_sign_packet,
1784 .sig_size = gensec_child_sig_size,
1785 .max_wrapped_size = gensec_child_max_wrapped_size,
1786 .max_input_size = gensec_child_max_input_size,
1787 .check_packet = gensec_child_check_packet,
1788 .unseal_packet = gensec_child_unseal_packet,
1789 .wrap = gensec_child_wrap,
1790 .unwrap = gensec_child_unwrap,
1791 .session_key = gensec_child_session_key,
1792 .session_info = gensec_child_session_info,
1793 .want_feature = gensec_child_want_feature,
1794 .have_feature = gensec_child_have_feature,
1795 .expire_time = gensec_child_expire_time,
1796 .final_auth_type = gensec_child_final_auth_type,
1797 .enabled = true,
1798 .priority = GENSEC_SPNEGO
1799 };
1800
1801 _PUBLIC_ NTSTATUS gensec_spnego_init(TALLOC_CTX *ctx)
1802 {
1803 NTSTATUS ret;
1804 ret = gensec_register(ctx, &gensec_spnego_security_ops);
1805 if (!NT_STATUS_IS_OK(ret)) {
1806 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1807 gensec_spnego_security_ops.name));
1808 return ret;
1809 }
1810
1811 return ret;
1812 }
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