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auth/spnego: move gensec_spnego_update() into gensec_spnego_update_send()
[Samba.git] / auth / gensec / spnego.c
blobbb2aa70a4d8c290590204bb42dbc487aab07cfca
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 struct tevent_context *ev,
144 TALLOC_CTX *out_mem_ctx,
145 const DATA_BLOB in, DATA_BLOB *out)
146 {
147 int i,j;
148 const struct gensec_security_ops **all_ops;
149
150 all_ops = gensec_security_mechs(gensec_security, out_mem_ctx);
151
152 for (i=0; all_ops && all_ops[i]; i++) {
153 bool is_spnego;
154 NTSTATUS nt_status;
155
156 if (gensec_security != NULL &&
157 !gensec_security_ops_enabled(all_ops[i], gensec_security))
158 continue;
159
160 if (!all_ops[i]->oid) {
161 continue;
162 }
163
164 is_spnego = false;
165 for (j=0; all_ops[i]->oid[j]; j++) {
166 if (strcasecmp(GENSEC_OID_SPNEGO,all_ops[i]->oid[j]) == 0) {
167 is_spnego = true;
168 }
169 }
170 if (is_spnego) {
171 continue;
172 }
173
174 if (!all_ops[i]->magic) {
175 continue;
176 }
177
178 nt_status = all_ops[i]->magic(gensec_security, &in);
179 if (!NT_STATUS_IS_OK(nt_status)) {
180 continue;
181 }
182
183 spnego_state->state_position = SPNEGO_FALLBACK;
184
185 nt_status = gensec_subcontext_start(spnego_state,
186 gensec_security,
187 &spnego_state->sub_sec_security);
188
189 if (!NT_STATUS_IS_OK(nt_status)) {
190 return nt_status;
191 }
192 /* select the sub context */
193 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
194 all_ops[i]);
195 if (!NT_STATUS_IS_OK(nt_status)) {
196 return nt_status;
197 }
198 nt_status = gensec_update_ev(spnego_state->sub_sec_security,
199 out_mem_ctx, ev, in, out);
200 return nt_status;
201 }
202 DEBUG(1, ("Failed to parse SPNEGO request\n"));
203 return NT_STATUS_INVALID_PARAMETER;
204 }
205
206 /*
207 Parse the netTokenInit, either from the client, to the server, or
208 from the server to the client.
209 */
210
211 static NTSTATUS gensec_spnego_parse_negTokenInit(struct gensec_security *gensec_security,
212 struct spnego_state *spnego_state,
213 TALLOC_CTX *out_mem_ctx,
214 struct tevent_context *ev,
215 const char * const *mechType,
216 const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out)
217 {
218 int i;
219 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
220 bool ok;
221
222 const struct gensec_security_ops_wrapper *all_sec
223 = gensec_security_by_oid_list(gensec_security,
224 out_mem_ctx,
225 mechType,
226 GENSEC_OID_SPNEGO);
227
228 ok = spnego_write_mech_types(spnego_state,
229 mechType,
230 &spnego_state->mech_types);
231 if (!ok) {
232 DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
233 return NT_STATUS_NO_MEMORY;
234 }
235
236 if (spnego_state->state_position == SPNEGO_SERVER_START) {
237 uint32_t j;
238 for (j=0; mechType && mechType[j]; j++) {
239 for (i=0; all_sec && all_sec[i].op; i++) {
240 if (strcmp(mechType[j], all_sec[i].oid) != 0) {
241 continue;
242 }
243
244 nt_status = gensec_subcontext_start(spnego_state,
245 gensec_security,
246 &spnego_state->sub_sec_security);
247 if (!NT_STATUS_IS_OK(nt_status)) {
248 return nt_status;
249 }
250 /* select the sub context */
251 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
252 all_sec[i].op);
253 if (!NT_STATUS_IS_OK(nt_status)) {
254 /*
255 * Pretend we never started it
256 */
257 gensec_spnego_update_sub_abort(spnego_state);
258 break;
259 }
260
261 if (j > 0) {
262 /* no optimistic token */
263 spnego_state->neg_oid = all_sec[i].oid;
264 *unwrapped_out = data_blob_null;
265 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
266 /*
267 * Indicate the downgrade and request a
268 * mic.
269 */
270 spnego_state->downgraded = true;
271 spnego_state->mic_requested = true;
272 break;
273 }
274
275 nt_status = gensec_update_ev(spnego_state->sub_sec_security,
276 out_mem_ctx,
277 ev,
278 unwrapped_in,
279 unwrapped_out);
280 if (NT_STATUS_IS_OK(nt_status)) {
281 spnego_state->sub_sec_ready = true;
282 }
283 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
284 NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
285
286 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse contents: %s\n",
287 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
288
289 /*
290 * Pretend we never started it
291 */
292 gensec_spnego_update_sub_abort(spnego_state);
293 break;
294 }
295
296 spnego_state->neg_oid = all_sec[i].oid;
297 break;
298 }
299 if (spnego_state->sub_sec_security) {
300 break;
301 }
302 }
303
304 if (!spnego_state->sub_sec_security) {
305 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
306 return NT_STATUS_INVALID_PARAMETER;
307 }
308 }
309
310 /* Having tried any optimistic token from the client (if we
311 * were the server), if we didn't get anywhere, walk our list
312 * in our preference order */
313
314 if (!spnego_state->sub_sec_security) {
315 for (i=0; all_sec && all_sec[i].op; i++) {
316 nt_status = gensec_subcontext_start(spnego_state,
317 gensec_security,
318 &spnego_state->sub_sec_security);
319 if (!NT_STATUS_IS_OK(nt_status)) {
320 return nt_status;
321 }
322 /* select the sub context */
323 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
324 all_sec[i].op);
325 if (!NT_STATUS_IS_OK(nt_status)) {
326 /*
327 * Pretend we never started it.
328 */
329 gensec_spnego_update_sub_abort(spnego_state);
330 continue;
331 }
332
333 spnego_state->neg_oid = all_sec[i].oid;
334
335 /* only get the helping start blob for the first OID */
336 nt_status = gensec_update_ev(spnego_state->sub_sec_security,
337 out_mem_ctx,
338 ev,
339 data_blob_null,
340 unwrapped_out);
341 if (NT_STATUS_IS_OK(nt_status)) {
342 spnego_state->sub_sec_ready = true;
343 }
344
345 /* it is likely that a NULL input token will
346 * not be liked by most server mechs, but if
347 * we are in the client, we want the first
348 * update packet to be able to abort the use
349 * of this mech */
350 if (spnego_state->state_position != SPNEGO_SERVER_START) {
351 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
352 NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_LOGON_SERVERS) ||
353 NT_STATUS_EQUAL(nt_status, NT_STATUS_TIME_DIFFERENCE_AT_DC) ||
354 NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
355 const char *next = NULL;
356 const char *principal = NULL;
357 int dbg_level = DBGLVL_WARNING;
358
359 if (all_sec[i+1].op != NULL) {
360 next = all_sec[i+1].op->name;
361 dbg_level = DBGLVL_NOTICE;
362 }
363
364 if (gensec_security->target.principal != NULL) {
365 principal = gensec_security->target.principal;
366 } else if (gensec_security->target.service != NULL &&
367 gensec_security->target.hostname != NULL)
368 {
369 principal = talloc_asprintf(spnego_state->sub_sec_security,
370 "%s/%s",
371 gensec_security->target.service,
372 gensec_security->target.hostname);
373 } else {
374 principal = gensec_security->target.hostname;
375 }
376
377 DEBUG(dbg_level, ("SPNEGO(%s) creating NEG_TOKEN_INIT for %s failed (next[%s]): %s\n",
378 spnego_state->sub_sec_security->ops->name,
379 principal,
380 next, nt_errstr(nt_status)));
381
382 /*
383 * Pretend we never started it.
384 */
385 gensec_spnego_update_sub_abort(spnego_state);
386 continue;
387 }
388 }
389
390 break;
391 }
392 }
393
394 if (spnego_state->sub_sec_security) {
395 /* it is likely that a NULL input token will
396 * not be liked by most server mechs, but this
397 * does the right thing in the CIFS client.
398 * just push us along the merry-go-round
399 * again, and hope for better luck next
400 * time */
401
402 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
403 *unwrapped_out = data_blob_null;
404 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
405 }
406
407 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)
408 && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
409 && !NT_STATUS_IS_OK(nt_status)) {
410 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
411 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
412
413 /* We started the mech correctly, and the
414 * input from the other side was valid.
415 * Return the error (say bad password, invalid
416 * ticket) */
417 gensec_spnego_update_sub_abort(spnego_state);
418 return nt_status;
419 }
420
421 return nt_status; /* OK, INVALID_PARAMETER ore MORE PROCESSING */
422 }
423
424 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
425 /* we could re-negotiate here, but it would only work
426 * if the client or server lied about what it could
427 * support the first time. Lets keep this code to
428 * reality */
429
430 return nt_status;
431 }
432
433 /** create a negTokenInit
434 *
435 * This is the same packet, no matter if the client or server sends it first, but it is always the first packet
436 */
437 static NTSTATUS gensec_spnego_create_negTokenInit(struct gensec_security *gensec_security,
438 struct spnego_state *spnego_state,
439 TALLOC_CTX *out_mem_ctx,
440 struct tevent_context *ev,
441 const DATA_BLOB in, DATA_BLOB *out)
442 {
443 int i;
444 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
445 const char **mechTypes = NULL;
446 DATA_BLOB unwrapped_out = data_blob_null;
447 const struct gensec_security_ops_wrapper *all_sec;
448
449 mechTypes = gensec_security_oids(gensec_security,
450 out_mem_ctx, GENSEC_OID_SPNEGO);
451
452 all_sec = gensec_security_by_oid_list(gensec_security,
453 out_mem_ctx,
454 mechTypes,
455 GENSEC_OID_SPNEGO);
456 for (i=0; all_sec && all_sec[i].op; i++) {
457 struct spnego_data spnego_out;
458 const char **send_mech_types;
459 bool ok;
460
461 nt_status = gensec_subcontext_start(spnego_state,
462 gensec_security,
463 &spnego_state->sub_sec_security);
464 if (!NT_STATUS_IS_OK(nt_status)) {
465 return nt_status;
466 }
467 /* select the sub context */
468 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
469 all_sec[i].op);
470 if (!NT_STATUS_IS_OK(nt_status)) {
471 gensec_spnego_update_sub_abort(spnego_state);
472 continue;
473 }
474
475 /* In the client, try and produce the first (optimistic) packet */
476 if (spnego_state->state_position == SPNEGO_CLIENT_START) {
477 nt_status = gensec_update_ev(spnego_state->sub_sec_security,
478 out_mem_ctx,
479 ev,
480 data_blob_null,
481 &unwrapped_out);
482 if (NT_STATUS_IS_OK(nt_status)) {
483 spnego_state->sub_sec_ready = true;
484 }
485
486 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
487 && !NT_STATUS_IS_OK(nt_status)) {
488 const char *next = NULL;
489 const char *principal = NULL;
490 int dbg_level = DBGLVL_WARNING;
491
492 if (all_sec[i+1].op != NULL) {
493 next = all_sec[i+1].op->name;
494 dbg_level = DBGLVL_NOTICE;
495 }
496
497 if (gensec_security->target.principal != NULL) {
498 principal = gensec_security->target.principal;
499 } else if (gensec_security->target.service != NULL &&
500 gensec_security->target.hostname != NULL)
501 {
502 principal = talloc_asprintf(spnego_state->sub_sec_security,
503 "%s/%s",
504 gensec_security->target.service,
505 gensec_security->target.hostname);
506 } else {
507 principal = gensec_security->target.hostname;
508 }
509
510 DEBUG(dbg_level, ("SPNEGO(%s) creating NEG_TOKEN_INIT for %s failed (next[%s]): %s\n",
511 spnego_state->sub_sec_security->ops->name,
512 principal,
513 next, nt_errstr(nt_status)));
514
515 /*
516 * Pretend we never started it
517 */
518 gensec_spnego_update_sub_abort(spnego_state);
519 continue;
520 }
521 }
522
523 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
524
525 send_mech_types = gensec_security_oids_from_ops_wrapped(out_mem_ctx,
526 &all_sec[i]);
527
528 ok = spnego_write_mech_types(spnego_state,
529 send_mech_types,
530 &spnego_state->mech_types);
531 if (!ok) {
532 DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
533 return NT_STATUS_NO_MEMORY;
534 }
535
536 /* List the remaining mechs as options */
537 spnego_out.negTokenInit.mechTypes = send_mech_types;
538 spnego_out.negTokenInit.reqFlags = data_blob_null;
539 spnego_out.negTokenInit.reqFlagsPadding = 0;
540
541 if (spnego_state->state_position == SPNEGO_SERVER_START) {
542 spnego_out.negTokenInit.mechListMIC
543 = data_blob_string_const(ADS_IGNORE_PRINCIPAL);
544 } else {
545 spnego_out.negTokenInit.mechListMIC = data_blob_null;
546 }
547
548 spnego_out.negTokenInit.mechToken = unwrapped_out;
549
550 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
551 DEBUG(1, ("Failed to write NEG_TOKEN_INIT\n"));
552 return NT_STATUS_INVALID_PARAMETER;
553 }
554
555 /* set next state */
556 spnego_state->neg_oid = all_sec[i].oid;
557
558 return NT_STATUS_MORE_PROCESSING_REQUIRED;
559 }
560 gensec_spnego_update_sub_abort(spnego_state);
561
562 DEBUG(10, ("Failed to setup SPNEGO negTokenInit request: %s\n", nt_errstr(nt_status)));
563 return nt_status;
564 }
565
566
567 /** create a server negTokenTarg
568 *
569 * This is the case, where the client is the first one who sends data
570 */
571
572 static NTSTATUS gensec_spnego_server_negTokenTarg(struct spnego_state *spnego_state,
573 TALLOC_CTX *out_mem_ctx,
574 NTSTATUS nt_status,
575 const DATA_BLOB unwrapped_out,
576 DATA_BLOB mech_list_mic,
577 DATA_BLOB *out)
578 {
579 struct spnego_data spnego_out;
580
581 /* compose reply */
582 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
583 spnego_out.negTokenTarg.responseToken = unwrapped_out;
584 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
585 spnego_out.negTokenTarg.supportedMech = NULL;
586
587 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
588 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
589 if (spnego_state->mic_requested) {
590 spnego_out.negTokenTarg.negResult = SPNEGO_REQUEST_MIC;
591 spnego_state->mic_requested = false;
592 } else {
593 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
594 }
595 spnego_state->state_position = SPNEGO_SERVER_TARG;
596 } else if (NT_STATUS_IS_OK(nt_status)) {
597 if (unwrapped_out.data) {
598 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
599 }
600 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
601 spnego_state->state_position = SPNEGO_DONE;
602 } else {
603 spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
604 spnego_out.negTokenTarg.mechListMIC = data_blob_null;
605 DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
606 spnego_state->state_position = SPNEGO_DONE;
607 }
608
609 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
610 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
611 return NT_STATUS_INVALID_PARAMETER;
612 }
613
614 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
615 spnego_state->num_targs++;
616
617 return nt_status;
618 }
619
620 static NTSTATUS gensec_spnego_update_client(struct gensec_security *gensec_security,
621 TALLOC_CTX *out_mem_ctx,
622 struct tevent_context *ev,
623 const DATA_BLOB in, DATA_BLOB *out)
624 {
625 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
626 DATA_BLOB mech_list_mic = data_blob_null;
627 DATA_BLOB unwrapped_out = data_blob_null;
628 struct spnego_data spnego_out;
629 struct spnego_data spnego;
630 ssize_t len;
631
632 *out = data_blob_null;
633
634 /* and switch into the state machine */
635
636 switch (spnego_state->state_position) {
637 case SPNEGO_CLIENT_START:
638 {
639 /* The server offers a list of mechanisms */
640
641 const char *my_mechs[] = {NULL, NULL};
642 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
643 bool ok;
644
645 if (!in.length) {
646 /* client to produce negTokenInit */
647 nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
648 out_mem_ctx, ev, in, out);
649 spnego_state->state_position = SPNEGO_CLIENT_TARG;
650 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
651 return nt_status;
652 }
653
654 len = spnego_read_data(gensec_security, in, &spnego);
655
656 if (len == -1) {
657 DEBUG(1, ("Invalid SPNEGO request:\n"));
658 dump_data(1, in.data, in.length);
659 return NT_STATUS_INVALID_PARAMETER;
660 }
661
662 /* OK, so it's real SPNEGO, check the packet's the one we expect */
663 if (spnego.type != spnego_state->expected_packet) {
664 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
665 spnego_state->expected_packet));
666 dump_data(1, in.data, in.length);
667 spnego_free_data(&spnego);
668 return NT_STATUS_INVALID_PARAMETER;
669 }
670
671 if (spnego.negTokenInit.targetPrincipal
672 && strcmp(spnego.negTokenInit.targetPrincipal, ADS_IGNORE_PRINCIPAL) != 0) {
673 DEBUG(5, ("Server claims it's principal name is %s\n", spnego.negTokenInit.targetPrincipal));
674 if (lpcfg_client_use_spnego_principal(gensec_security->settings->lp_ctx)) {
675 gensec_set_target_principal(gensec_security, spnego.negTokenInit.targetPrincipal);
676 }
677 }
678
679 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
680 spnego_state,
681 out_mem_ctx,
682 ev,
683 spnego.negTokenInit.mechTypes,
684 spnego.negTokenInit.mechToken,
685 &unwrapped_out);
686
687 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
688 spnego_free_data(&spnego);
689 return nt_status;
690 }
691
692 my_mechs[0] = spnego_state->neg_oid;
693 /* compose reply */
694 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
695 spnego_out.negTokenInit.mechTypes = my_mechs;
696 spnego_out.negTokenInit.reqFlags = data_blob_null;
697 spnego_out.negTokenInit.reqFlagsPadding = 0;
698 spnego_out.negTokenInit.mechListMIC = data_blob_null;
699 spnego_out.negTokenInit.mechToken = unwrapped_out;
700
701 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
702 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
703 return NT_STATUS_INVALID_PARAMETER;
704 }
705
706 ok = spnego_write_mech_types(spnego_state,
707 my_mechs,
708 &spnego_state->mech_types);
709 if (!ok) {
710 DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
711 return NT_STATUS_NO_MEMORY;
712 }
713
714 /* set next state */
715 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
716 spnego_state->state_position = SPNEGO_CLIENT_TARG;
717
718 spnego_free_data(&spnego);
719 return NT_STATUS_MORE_PROCESSING_REQUIRED;
720 }
721
722 case SPNEGO_CLIENT_TARG:
723 {
724 NTSTATUS nt_status = NT_STATUS_INTERNAL_ERROR;
725
726 if (!in.length) {
727 return NT_STATUS_INVALID_PARAMETER;
728 }
729
730 len = spnego_read_data(gensec_security, in, &spnego);
731
732 if (len == -1) {
733 DEBUG(1, ("Invalid SPNEGO request:\n"));
734 dump_data(1, in.data, in.length);
735 return NT_STATUS_INVALID_PARAMETER;
736 }
737
738 /* OK, so it's real SPNEGO, check the packet's the one we expect */
739 if (spnego.type != spnego_state->expected_packet) {
740 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
741 spnego_state->expected_packet));
742 dump_data(1, in.data, in.length);
743 spnego_free_data(&spnego);
744 return NT_STATUS_INVALID_PARAMETER;
745 }
746
747 spnego_state->num_targs++;
748
749 if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
750 spnego_free_data(&spnego);
751 return NT_STATUS_LOGON_FAILURE;
752 }
753
754 if (spnego.negTokenTarg.negResult == SPNEGO_REQUEST_MIC) {
755 spnego_state->mic_requested = true;
756 }
757
758 /* Server didn't like our choice of mech, and chose something else */
759 if (((spnego.negTokenTarg.negResult == SPNEGO_ACCEPT_INCOMPLETE) ||
760 (spnego.negTokenTarg.negResult == SPNEGO_REQUEST_MIC)) &&
761 spnego.negTokenTarg.supportedMech &&
762 strcmp(spnego.negTokenTarg.supportedMech, spnego_state->neg_oid) != 0) {
763 DEBUG(3,("GENSEC SPNEGO: client preferred mech (%s) not accepted, server wants: %s\n",
764 gensec_get_name_by_oid(gensec_security, spnego_state->neg_oid),
765 gensec_get_name_by_oid(gensec_security, spnego.negTokenTarg.supportedMech)));
766 spnego_state->downgraded = true;
767 gensec_spnego_update_sub_abort(spnego_state);
768 nt_status = gensec_subcontext_start(spnego_state,
769 gensec_security,
770 &spnego_state->sub_sec_security);
771 if (!NT_STATUS_IS_OK(nt_status)) {
772 spnego_free_data(&spnego);
773 return nt_status;
774 }
775 /* select the sub context */
776 nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
777 spnego.negTokenTarg.supportedMech);
778 if (!NT_STATUS_IS_OK(nt_status)) {
779 spnego_free_data(&spnego);
780 return nt_status;
781 }
782
783 spnego_state->neg_oid = talloc_strdup(spnego_state,
784 spnego.negTokenTarg.supportedMech);
785 if (spnego_state->neg_oid == NULL) {
786 spnego_free_data(&spnego);
787 return NT_STATUS_NO_MEMORY;
788 };
789 }
790
791 if (spnego.negTokenTarg.mechListMIC.length > 0) {
792 DATA_BLOB *m = &spnego.negTokenTarg.mechListMIC;
793 const DATA_BLOB *r = &spnego.negTokenTarg.responseToken;
794
795 /*
796 * Windows 2000 has a bug, it repeats the
797 * responseToken in the mechListMIC field.
798 */
799 if (m->length == r->length) {
800 int cmp;
801
802 cmp = memcmp(m->data, r->data, m->length);
803 if (cmp == 0) {
804 data_blob_free(m);
805 }
806 }
807 }
808
809 if (spnego.negTokenTarg.mechListMIC.length > 0) {
810 if (spnego_state->sub_sec_ready) {
811 spnego_state->needs_mic_check = true;
812 }
813 }
814
815 if (spnego_state->needs_mic_check) {
816 if (spnego.negTokenTarg.responseToken.length != 0) {
817 DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
818 spnego_free_data(&spnego);
819 return NT_STATUS_INVALID_PARAMETER;
820 }
821
822 if (spnego.negTokenTarg.mechListMIC.length == 0
823 && spnego_state->may_skip_mic_check) {
824 /*
825 * In this case we don't require
826 * a mechListMIC from the server.
827 *
828 * This works around bugs in the Azure
829 * and Apple spnego implementations.
830 *
831 * See
832 * https://bugzilla.samba.org/show_bug.cgi?id=11994
833 */
834 spnego_state->needs_mic_check = false;
835 nt_status = NT_STATUS_OK;
836 goto client_response;
837 }
838
839 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
840 spnego_state->mech_types.data,
841 spnego_state->mech_types.length,
842 spnego_state->mech_types.data,
843 spnego_state->mech_types.length,
844 &spnego.negTokenTarg.mechListMIC);
845 if (!NT_STATUS_IS_OK(nt_status)) {
846 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
847 nt_errstr(nt_status)));
848 spnego_free_data(&spnego);
849 return nt_status;
850 }
851 spnego_state->needs_mic_check = false;
852 spnego_state->done_mic_check = true;
853 goto client_response;
854 }
855
856 if (!spnego_state->sub_sec_ready) {
857 nt_status = gensec_update_ev(spnego_state->sub_sec_security,
858 out_mem_ctx, ev,
859 spnego.negTokenTarg.responseToken,
860 &unwrapped_out);
861 if (NT_STATUS_IS_OK(nt_status)) {
862 spnego_state->sub_sec_ready = true;
863 }
864 if (!NT_STATUS_IS_OK(nt_status)) {
865 goto client_response;
866 }
867 } else {
868 nt_status = NT_STATUS_OK;
869 }
870
871 if (!spnego_state->done_mic_check) {
872 bool have_sign = true;
873 bool new_spnego = false;
874
875 have_sign = gensec_have_feature(spnego_state->sub_sec_security,
876 GENSEC_FEATURE_SIGN);
877 if (spnego_state->simulate_w2k) {
878 have_sign = false;
879 }
880 new_spnego = gensec_have_feature(spnego_state->sub_sec_security,
881 GENSEC_FEATURE_NEW_SPNEGO);
882
883 switch (spnego.negTokenTarg.negResult) {
884 case SPNEGO_ACCEPT_COMPLETED:
885 case SPNEGO_NONE_RESULT:
886 if (spnego_state->num_targs == 1) {
887 /*
888 * the first exchange doesn't require
889 * verification
890 */
891 new_spnego = false;
892 }
893
894 break;
895
896 case SPNEGO_ACCEPT_INCOMPLETE:
897 if (spnego.negTokenTarg.mechListMIC.length > 0) {
898 new_spnego = true;
899 break;
900 }
901
902 if (spnego_state->downgraded) {
903 /*
904 * A downgrade should be protected if
905 * supported
906 */
907 break;
908 }
909
910 /*
911 * The caller may just asked for
912 * GENSEC_FEATURE_SESSION_KEY, this
913 * is only reflected in the want_features.
914 *
915 * As it will imply
916 * gensec_have_features(GENSEC_FEATURE_SIGN)
917 * to return true.
918 */
919 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
920 break;
921 }
922 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
923 break;
924 }
925 /*
926 * Here we're sure our preferred mech was
927 * selected by the server and our caller doesn't
928 * need GENSEC_FEATURE_SIGN nor
929 * GENSEC_FEATURE_SEAL support.
930 *
931 * In this case we don't require
932 * a mechListMIC from the server.
933 *
934 * This works around bugs in the Azure
935 * and Apple spnego implementations.
936 *
937 * See
938 * https://bugzilla.samba.org/show_bug.cgi?id=11994
939 */
940 spnego_state->may_skip_mic_check = true;
941 break;
942
943 case SPNEGO_REQUEST_MIC:
944 if (spnego.negTokenTarg.mechListMIC.length > 0) {
945 new_spnego = true;
946 }
947 break;
948 default:
949 break;
950 }
951
952 if (spnego_state->mic_requested) {
953 if (have_sign) {
954 new_spnego = true;
955 }
956 }
957
958 if (have_sign && new_spnego) {
959 spnego_state->needs_mic_check = true;
960 spnego_state->needs_mic_sign = true;
961 }
962 }
963
964 if (spnego.negTokenTarg.mechListMIC.length > 0) {
965 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
966 spnego_state->mech_types.data,
967 spnego_state->mech_types.length,
968 spnego_state->mech_types.data,
969 spnego_state->mech_types.length,
970 &spnego.negTokenTarg.mechListMIC);
971 if (!NT_STATUS_IS_OK(nt_status)) {
972 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
973 nt_errstr(nt_status)));
974 spnego_free_data(&spnego);
975 return nt_status;
976 }
977 spnego_state->needs_mic_check = false;
978 spnego_state->done_mic_check = true;
979 }
980
981 if (spnego_state->needs_mic_sign) {
982 nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
983 out_mem_ctx,
984 spnego_state->mech_types.data,
985 spnego_state->mech_types.length,
986 spnego_state->mech_types.data,
987 spnego_state->mech_types.length,
988 &mech_list_mic);
989 if (!NT_STATUS_IS_OK(nt_status)) {
990 DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
991 nt_errstr(nt_status)));
992 spnego_free_data(&spnego);
993 return nt_status;
994 }
995 spnego_state->needs_mic_sign = false;
996 }
997
998 if (spnego_state->needs_mic_check) {
999 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
1000 }
1001
1002 client_response:
1003 spnego_free_data(&spnego);
1004
1005 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
1006 && !NT_STATUS_IS_OK(nt_status)) {
1007 DEBUG(1, ("SPNEGO(%s) login failed: %s\n",
1008 spnego_state->sub_sec_security->ops->name,
1009 nt_errstr(nt_status)));
1010 return nt_status;
1011 }
1012
1013 if (unwrapped_out.length || mech_list_mic.length) {
1014 /* compose reply */
1015 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
1016 spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
1017 spnego_out.negTokenTarg.supportedMech = NULL;
1018 spnego_out.negTokenTarg.responseToken = unwrapped_out;
1019 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
1020
1021 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
1022 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
1023 return NT_STATUS_INVALID_PARAMETER;
1024 }
1025
1026 spnego_state->num_targs++;
1027 spnego_state->state_position = SPNEGO_CLIENT_TARG;
1028 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
1029 } else {
1030
1031 /* all done - server has accepted, and we agree */
1032 *out = data_blob_null;
1033
1034 if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1035 /* unless of course it did not accept */
1036 DEBUG(1,("gensec_update ok but not accepted\n"));
1037 nt_status = NT_STATUS_INVALID_PARAMETER;
1038 }
1039
1040 spnego_state->state_position = SPNEGO_DONE;
1041 }
1042
1043 return nt_status;
1044 }
1045
1046 default:
1047 break;
1048 }
1049
1050 smb_panic(__location__);
1051 return NT_STATUS_INTERNAL_ERROR;
1052 }
1053
1054 static NTSTATUS gensec_spnego_update_server(struct gensec_security *gensec_security,
1055 TALLOC_CTX *out_mem_ctx,
1056 struct tevent_context *ev,
1057 const DATA_BLOB in, DATA_BLOB *out)
1058 {
1059 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1060 DATA_BLOB mech_list_mic = data_blob_null;
1061 DATA_BLOB unwrapped_out = data_blob_null;
1062 struct spnego_data spnego;
1063 ssize_t len;
1064
1065 /* and switch into the state machine */
1066
1067 switch (spnego_state->state_position) {
1068 case SPNEGO_SERVER_START:
1069 {
1070 NTSTATUS nt_status;
1071 if (in.length) {
1072
1073 len = spnego_read_data(gensec_security, in, &spnego);
1074 if (len == -1) {
1075 return gensec_spnego_server_try_fallback(gensec_security, spnego_state,
1076 ev, out_mem_ctx, in, out);
1077 }
1078 /* client sent NegTargetInit, we send NegTokenTarg */
1079
1080 /* OK, so it's real SPNEGO, check the packet's the one we expect */
1081 if (spnego.type != spnego_state->expected_packet) {
1082 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
1083 spnego_state->expected_packet));
1084 dump_data(1, in.data, in.length);
1085 spnego_free_data(&spnego);
1086 return NT_STATUS_INVALID_PARAMETER;
1087 }
1088
1089 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
1090 spnego_state,
1091 out_mem_ctx,
1092 ev,
1093 spnego.negTokenInit.mechTypes,
1094 spnego.negTokenInit.mechToken,
1095 &unwrapped_out);
1096
1097 if (spnego_state->simulate_w2k) {
1098 /*
1099 * Windows 2000 returns the unwrapped token
1100 * also in the mech_list_mic field.
1101 *
1102 * In order to verify our client code,
1103 * we need a way to have a server with this
1104 * broken behaviour
1105 */
1106 mech_list_mic = unwrapped_out;
1107 }
1108
1109 nt_status = gensec_spnego_server_negTokenTarg(spnego_state,
1110 out_mem_ctx,
1111 nt_status,
1112 unwrapped_out,
1113 mech_list_mic,
1114 out);
1115
1116 spnego_free_data(&spnego);
1117
1118 return nt_status;
1119 } else {
1120 nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
1121 out_mem_ctx, ev, in, out);
1122 spnego_state->state_position = SPNEGO_SERVER_START;
1123 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
1124 return nt_status;
1125 }
1126 }
1127
1128 case SPNEGO_SERVER_TARG:
1129 {
1130 NTSTATUS nt_status;
1131 bool have_sign = true;
1132 bool new_spnego = false;
1133
1134 if (!in.length) {
1135 return NT_STATUS_INVALID_PARAMETER;
1136 }
1137
1138 len = spnego_read_data(gensec_security, in, &spnego);
1139
1140 if (len == -1) {
1141 DEBUG(1, ("Invalid SPNEGO request:\n"));
1142 dump_data(1, in.data, in.length);
1143 return NT_STATUS_INVALID_PARAMETER;
1144 }
1145
1146 /* OK, so it's real SPNEGO, check the packet's the one we expect */
1147 if (spnego.type != spnego_state->expected_packet) {
1148 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
1149 spnego_state->expected_packet));
1150 dump_data(1, in.data, in.length);
1151 spnego_free_data(&spnego);
1152 return NT_STATUS_INVALID_PARAMETER;
1153 }
1154
1155 spnego_state->num_targs++;
1156
1157 if (!spnego_state->sub_sec_security) {
1158 DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
1159 spnego_free_data(&spnego);
1160 return NT_STATUS_INVALID_PARAMETER;
1161 }
1162
1163 if (spnego_state->needs_mic_check) {
1164 if (spnego.negTokenTarg.responseToken.length != 0) {
1165 DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
1166 spnego_free_data(&spnego);
1167 return NT_STATUS_INVALID_PARAMETER;
1168 }
1169
1170 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
1171 spnego_state->mech_types.data,
1172 spnego_state->mech_types.length,
1173 spnego_state->mech_types.data,
1174 spnego_state->mech_types.length,
1175 &spnego.negTokenTarg.mechListMIC);
1176 if (NT_STATUS_IS_OK(nt_status)) {
1177 spnego_state->needs_mic_check = false;
1178 spnego_state->done_mic_check = true;
1179 } else {
1180 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
1181 nt_errstr(nt_status)));
1182 }
1183 goto server_response;
1184 }
1185
1186 nt_status = gensec_update_ev(spnego_state->sub_sec_security,
1187 out_mem_ctx, ev,
1188 spnego.negTokenTarg.responseToken,
1189 &unwrapped_out);
1190 if (NT_STATUS_IS_OK(nt_status)) {
1191 spnego_state->sub_sec_ready = true;
1192 }
1193 if (!NT_STATUS_IS_OK(nt_status)) {
1194 goto server_response;
1195 }
1196
1197 have_sign = gensec_have_feature(spnego_state->sub_sec_security,
1198 GENSEC_FEATURE_SIGN);
1199 if (spnego_state->simulate_w2k) {
1200 have_sign = false;
1201 }
1202 new_spnego = gensec_have_feature(spnego_state->sub_sec_security,
1203 GENSEC_FEATURE_NEW_SPNEGO);
1204 if (spnego.negTokenTarg.mechListMIC.length > 0) {
1205 new_spnego = true;
1206 }
1207
1208 if (have_sign && new_spnego) {
1209 spnego_state->needs_mic_check = true;
1210 spnego_state->needs_mic_sign = true;
1211 }
1212
1213 if (have_sign && spnego.negTokenTarg.mechListMIC.length > 0) {
1214 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
1215 spnego_state->mech_types.data,
1216 spnego_state->mech_types.length,
1217 spnego_state->mech_types.data,
1218 spnego_state->mech_types.length,
1219 &spnego.negTokenTarg.mechListMIC);
1220 if (!NT_STATUS_IS_OK(nt_status)) {
1221 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
1222 nt_errstr(nt_status)));
1223 goto server_response;
1224 }
1225
1226 spnego_state->needs_mic_check = false;
1227 spnego_state->done_mic_check = true;
1228 }
1229
1230 if (spnego_state->needs_mic_sign) {
1231 nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
1232 out_mem_ctx,
1233 spnego_state->mech_types.data,
1234 spnego_state->mech_types.length,
1235 spnego_state->mech_types.data,
1236 spnego_state->mech_types.length,
1237 &mech_list_mic);
1238 if (!NT_STATUS_IS_OK(nt_status)) {
1239 DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
1240 nt_errstr(nt_status)));
1241 goto server_response;
1242 }
1243 spnego_state->needs_mic_sign = false;
1244 }
1245
1246 if (spnego_state->needs_mic_check) {
1247 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
1248 }
1249
1250 server_response:
1251 nt_status = gensec_spnego_server_negTokenTarg(spnego_state,
1252 out_mem_ctx,
1253 nt_status,
1254 unwrapped_out,
1255 mech_list_mic,
1256 out);
1257
1258 spnego_free_data(&spnego);
1259
1260 return nt_status;
1261 }
1262
1263 default:
1264 break;
1265 }
1266
1267 smb_panic(__location__);
1268 return NT_STATUS_INTERNAL_ERROR;
1269 }
1270
1271 struct gensec_spnego_update_state {
1272 struct gensec_security *gensec;
1273 struct spnego_state *spnego;
1274 DATA_BLOB full_in;
1275 NTSTATUS status;
1276 DATA_BLOB out;
1277 };
1278
1279 static void gensec_spnego_update_cleanup(struct tevent_req *req,
1280 enum tevent_req_state req_state)
1281 {
1282 struct gensec_spnego_update_state *state =
1283 tevent_req_data(req,
1284 struct gensec_spnego_update_state);
1285
1286 switch (req_state) {
1287 case TEVENT_REQ_USER_ERROR:
1288 case TEVENT_REQ_TIMED_OUT:
1289 case TEVENT_REQ_NO_MEMORY:
1290 /*
1291 * A fatal error, further updates are not allowed.
1292 */
1293 state->spnego->state_position = SPNEGO_DONE;
1294 break;
1295 default:
1296 break;
1297 }
1298 }
1299
1300 static NTSTATUS gensec_spnego_update_in(struct gensec_security *gensec_security,
1301 const DATA_BLOB in, TALLOC_CTX *mem_ctx,
1302 DATA_BLOB *full_in);
1303 static NTSTATUS gensec_spnego_update_out(struct gensec_security *gensec_security,
1304 TALLOC_CTX *out_mem_ctx,
1305 DATA_BLOB *_out);
1306
1307 static struct tevent_req *gensec_spnego_update_send(TALLOC_CTX *mem_ctx,
1308 struct tevent_context *ev,
1309 struct gensec_security *gensec_security,
1310 const DATA_BLOB in)
1311 {
1312 struct spnego_state *spnego_state =
1313 talloc_get_type_abort(gensec_security->private_data,
1314 struct spnego_state);
1315 struct tevent_req *req = NULL;
1316 struct gensec_spnego_update_state *state = NULL;
1317 NTSTATUS status;
1318
1319 req = tevent_req_create(mem_ctx, &state,
1320 struct gensec_spnego_update_state);
1321 if (req == NULL) {
1322 return NULL;
1323 }
1324 state->gensec = gensec_security;
1325 state->spnego = spnego_state;
1326 tevent_req_set_cleanup_fn(req, gensec_spnego_update_cleanup);
1327
1328 if (spnego_state->out_frag.length > 0) {
1329 if (in.length > 0) {
1330 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
1331 return tevent_req_post(req, ev);
1332 }
1333
1334 status = gensec_spnego_update_out(gensec_security,
1335 state, &state->out);
1336 state->status = status;
1337 if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
1338 tevent_req_done(req);
1339 return tevent_req_post(req, ev);
1340 }
1341 if (tevent_req_nterror(req, status)) {
1342 return tevent_req_post(req, ev);
1343 }
1344
1345 tevent_req_done(req);
1346 return tevent_req_post(req, ev);
1347 }
1348
1349 status = gensec_spnego_update_in(gensec_security, in,
1350 state, &state->full_in);
1351 state->status = status;
1352 if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
1353 tevent_req_done(req);
1354 return tevent_req_post(req, ev);
1355 }
1356 if (tevent_req_nterror(req, status)) {
1357 return tevent_req_post(req, ev);
1358 }
1359
1360 /* and switch into the state machine */
1361
1362 switch (spnego_state->state_position) {
1363 case SPNEGO_FALLBACK:
1364 status = gensec_update_ev(spnego_state->sub_sec_security,
1365 state, ev,
1366 state->full_in,
1367 &spnego_state->out_frag);
1368 break;
1369
1370 case SPNEGO_CLIENT_START:
1371 case SPNEGO_CLIENT_TARG:
1372 status = gensec_spnego_update_client(gensec_security,
1373 state, ev,
1374 state->full_in,
1375 &spnego_state->out_frag);
1376 break;
1377
1378 case SPNEGO_SERVER_START:
1379 case SPNEGO_SERVER_TARG:
1380 status = gensec_spnego_update_server(gensec_security,
1381 state, ev,
1382 state->full_in,
1383 &spnego_state->out_frag);
1384 break;
1385
1386 case SPNEGO_DONE:
1387 /* We should not be called after we are 'done' */
1388 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
1389 return tevent_req_post(req, ev);
1390
1391 default:
1392 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
1393 return tevent_req_post(req, ev);
1394 }
1395
1396 if (NT_STATUS_IS_OK(status)) {
1397 bool reset_full = true;
1398
1399 reset_full = !spnego_state->done_mic_check;
1400
1401 status = gensec_may_reset_crypto(spnego_state->sub_sec_security,
1402 reset_full);
1403 }
1404 if (!NT_STATUS_IS_OK(status) &&
1405 !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
1406 tevent_req_nterror(req, status);
1407 return tevent_req_post(req, ev);
1408 }
1409
1410 spnego_state->out_status = status;
1411
1412 status = gensec_spnego_update_out(gensec_security,
1413 state, &state->out);
1414 state->status = status;
1415 if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
1416 tevent_req_done(req);
1417 return tevent_req_post(req, ev);
1418 }
1419 if (tevent_req_nterror(req, status)) {
1420 return tevent_req_post(req, ev);
1421 }
1422
1423 tevent_req_done(req);
1424 return tevent_req_post(req, ev);
1425 }
1426
1427 static NTSTATUS gensec_spnego_update_in(struct gensec_security *gensec_security,
1428 const DATA_BLOB in, TALLOC_CTX *mem_ctx,
1429 DATA_BLOB *full_in)
1430 {
1431 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1432 size_t expected;
1433 bool ok;
1434
1435 *full_in = data_blob_null;
1436
1437 if (spnego_state->in_needed == 0) {
1438 size_t size = 0;
1439 int ret;
1440
1441 /*
1442 * try to work out the size of the full
1443 * input token, it might be fragmented
1444 */
1445 ret = asn1_peek_full_tag(in, ASN1_APPLICATION(0), &size);
1446 if ((ret != 0) && (ret != EAGAIN)) {
1447 ret = asn1_peek_full_tag(in, ASN1_CONTEXT(1), &size);
1448 }
1449
1450 if ((ret == 0) || (ret == EAGAIN)) {
1451 spnego_state->in_needed = size;
1452 } else {
1453 /*
1454 * If it is not an asn1 message
1455 * just call the next layer.
1456 */
1457 spnego_state->in_needed = in.length;
1458 }
1459 }
1460
1461 if (spnego_state->in_needed > UINT16_MAX) {
1462 /*
1463 * limit the incoming message to 0xFFFF
1464 * to avoid DoS attacks.
1465 */
1466 return NT_STATUS_INVALID_BUFFER_SIZE;
1467 }
1468
1469 if ((spnego_state->in_needed > 0) && (in.length == 0)) {
1470 /*
1471 * If we reach this, we know we got at least
1472 * part of an asn1 message, getting 0 means
1473 * the remote peer wants us to spin.
1474 */
1475 return NT_STATUS_INVALID_PARAMETER;
1476 }
1477
1478 expected = spnego_state->in_needed - spnego_state->in_frag.length;
1479 if (in.length > expected) {
1480 /*
1481 * we got more than expected
1482 */
1483 return NT_STATUS_INVALID_PARAMETER;
1484 }
1485
1486 if (in.length == spnego_state->in_needed) {
1487 /*
1488 * if the in.length contains the full blob
1489 * we are done.
1490 *
1491 * Note: this implies spnego_state->in_frag.length == 0,
1492 * but we do not need to check this explicitly
1493 * because we already know that we did not get
1494 * more than expected.
1495 */
1496 *full_in = in;
1497 spnego_state->in_needed = 0;
1498 return NT_STATUS_OK;
1499 }
1500
1501 ok = data_blob_append(spnego_state, &spnego_state->in_frag,
1502 in.data, in.length);
1503 if (!ok) {
1504 return NT_STATUS_NO_MEMORY;
1505 }
1506
1507 if (spnego_state->in_needed > spnego_state->in_frag.length) {
1508 return NT_STATUS_MORE_PROCESSING_REQUIRED;
1509 }
1510
1511 *full_in = spnego_state->in_frag;
1512 talloc_steal(mem_ctx, full_in->data);
1513 spnego_state->in_frag = data_blob_null;
1514 spnego_state->in_needed = 0;
1515 return NT_STATUS_OK;
1516 }
1517
1518 static NTSTATUS gensec_spnego_update_out(struct gensec_security *gensec_security,
1519 TALLOC_CTX *out_mem_ctx,
1520 DATA_BLOB *_out)
1521 {
1522 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1523 DATA_BLOB out = data_blob_null;
1524 bool ok;
1525
1526 *_out = data_blob_null;
1527
1528 if (spnego_state->out_frag.length <= spnego_state->out_max_length) {
1529 /*
1530 * Fast path, we can deliver everything
1531 */
1532
1533 *_out = spnego_state->out_frag;
1534 if (spnego_state->out_frag.length > 0) {
1535 talloc_steal(out_mem_ctx, _out->data);
1536 spnego_state->out_frag = data_blob_null;
1537 }
1538
1539 if (!NT_STATUS_IS_OK(spnego_state->out_status)) {
1540 return spnego_state->out_status;
1541 }
1542
1543 /*
1544 * We're completely done, further updates are not allowed.
1545 */
1546 spnego_state->state_position = SPNEGO_DONE;
1547 return gensec_child_ready(gensec_security,
1548 spnego_state->sub_sec_security);
1549 }
1550
1551 out = spnego_state->out_frag;
1552
1553 /*
1554 * copy the remaining bytes
1555 */
1556 spnego_state->out_frag = data_blob_talloc(spnego_state,
1557 out.data + spnego_state->out_max_length,
1558 out.length - spnego_state->out_max_length);
1559 if (spnego_state->out_frag.data == NULL) {
1560 return NT_STATUS_NO_MEMORY;
1561 }
1562
1563 /*
1564 * truncate the buffer
1565 */
1566 ok = data_blob_realloc(spnego_state, &out,
1567 spnego_state->out_max_length);
1568 if (!ok) {
1569 return NT_STATUS_NO_MEMORY;
1570 }
1571
1572 talloc_steal(out_mem_ctx, out.data);
1573 *_out = out;
1574 return NT_STATUS_MORE_PROCESSING_REQUIRED;
1575 }
1576
1577 static NTSTATUS gensec_spnego_update_recv(struct tevent_req *req,
1578 TALLOC_CTX *out_mem_ctx,
1579 DATA_BLOB *out)
1580 {
1581 struct gensec_spnego_update_state *state =
1582 tevent_req_data(req,
1583 struct gensec_spnego_update_state);
1584 NTSTATUS status;
1585
1586 *out = data_blob_null;
1587
1588 if (tevent_req_is_nterror(req, &status)) {
1589 tevent_req_received(req);
1590 return status;
1591 }
1592
1593 *out = state->out;
1594 talloc_steal(out_mem_ctx, state->out.data);
1595 status = state->status;
1596 tevent_req_received(req);
1597 return status;
1598 }
1599
1600 static const char *gensec_spnego_oids[] = {
1601 GENSEC_OID_SPNEGO,
1602 NULL
1603 };
1604
1605 static const struct gensec_security_ops gensec_spnego_security_ops = {
1606 .name = "spnego",
1607 .sasl_name = "GSS-SPNEGO",
1608 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1609 .oid = gensec_spnego_oids,
1610 .client_start = gensec_spnego_client_start,
1611 .server_start = gensec_spnego_server_start,
1612 .update_send = gensec_spnego_update_send,
1613 .update_recv = gensec_spnego_update_recv,
1614 .seal_packet = gensec_child_seal_packet,
1615 .sign_packet = gensec_child_sign_packet,
1616 .sig_size = gensec_child_sig_size,
1617 .max_wrapped_size = gensec_child_max_wrapped_size,
1618 .max_input_size = gensec_child_max_input_size,
1619 .check_packet = gensec_child_check_packet,
1620 .unseal_packet = gensec_child_unseal_packet,
1621 .wrap = gensec_child_wrap,
1622 .unwrap = gensec_child_unwrap,
1623 .session_key = gensec_child_session_key,
1624 .session_info = gensec_child_session_info,
1625 .want_feature = gensec_child_want_feature,
1626 .have_feature = gensec_child_have_feature,
1627 .expire_time = gensec_child_expire_time,
1628 .final_auth_type = gensec_child_final_auth_type,
1629 .enabled = true,
1630 .priority = GENSEC_SPNEGO
1631 };
1632
1633 _PUBLIC_ NTSTATUS gensec_spnego_init(TALLOC_CTX *ctx)
1634 {
1635 NTSTATUS ret;
1636 ret = gensec_register(ctx, &gensec_spnego_security_ops);
1637 if (!NT_STATUS_IS_OK(ret)) {
1638 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1639 gensec_spnego_security_ops.name));
1640 return ret;
1641 }
1642
1643 return ret;
1644 }
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