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libsmbconf: add smbconf_create_set_share
[Samba.git] / auth / gensec / spnego.c
blobda1fc0ecde50599adeff73bb5be6bfa6a49290c6
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 "../libcli/auth/spnego.h"
27 #include "librpc/gen_ndr/ndr_dcerpc.h"
28 #include "auth/credentials/credentials.h"
29 #include "auth/gensec/gensec.h"
30 #include "param/param.h"
31 #include "lib/util/asn1.h"
32
33 #undef strcasecmp
34
35 _PUBLIC_ NTSTATUS gensec_spnego_init(void);
36
37 enum spnego_state_position {
38 SPNEGO_SERVER_START,
39 SPNEGO_CLIENT_START,
40 SPNEGO_SERVER_TARG,
41 SPNEGO_CLIENT_TARG,
42 SPNEGO_FALLBACK,
43 SPNEGO_DONE
44 };
45
46 struct spnego_state {
47 enum spnego_message_type expected_packet;
48 enum spnego_state_position state_position;
49 struct gensec_security *sub_sec_security;
50 bool no_response_expected;
51
52 const char *neg_oid;
53
54 DATA_BLOB mech_types;
55
56 /*
57 * The following is used to implement
58 * the update token fragmentation
59 */
60 size_t in_needed;
61 DATA_BLOB in_frag;
62 size_t out_max_length;
63 DATA_BLOB out_frag;
64 NTSTATUS out_status;
65 };
66
67
68 static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_security)
69 {
70 struct spnego_state *spnego_state;
71
72 spnego_state = talloc_zero(gensec_security, struct spnego_state);
73 if (!spnego_state) {
74 return NT_STATUS_NO_MEMORY;
75 }
76
77 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
78 spnego_state->state_position = SPNEGO_CLIENT_START;
79 spnego_state->sub_sec_security = NULL;
80 spnego_state->no_response_expected = false;
81 spnego_state->mech_types = data_blob(NULL, 0);
82 spnego_state->out_max_length = gensec_max_update_size(gensec_security);
83 spnego_state->out_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
84
85 gensec_security->private_data = spnego_state;
86 return NT_STATUS_OK;
87 }
88
89 static NTSTATUS gensec_spnego_server_start(struct gensec_security *gensec_security)
90 {
91 struct spnego_state *spnego_state;
92
93 spnego_state = talloc_zero(gensec_security, struct spnego_state);
94 if (!spnego_state) {
95 return NT_STATUS_NO_MEMORY;
96 }
97
98 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
99 spnego_state->state_position = SPNEGO_SERVER_START;
100 spnego_state->sub_sec_security = NULL;
101 spnego_state->no_response_expected = false;
102 spnego_state->mech_types = data_blob(NULL, 0);
103 spnego_state->out_max_length = gensec_max_update_size(gensec_security);
104 spnego_state->out_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
105
106 gensec_security->private_data = spnego_state;
107 return NT_STATUS_OK;
108 }
109
110 /*
111 wrappers for the spnego_*() functions
112 */
113 static NTSTATUS gensec_spnego_unseal_packet(struct gensec_security *gensec_security,
114 uint8_t *data, size_t length,
115 const uint8_t *whole_pdu, size_t pdu_length,
116 const DATA_BLOB *sig)
117 {
118 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
119
120 if (spnego_state->state_position != SPNEGO_DONE
121 && spnego_state->state_position != SPNEGO_FALLBACK) {
122 return NT_STATUS_INVALID_PARAMETER;
123 }
124
125 return gensec_unseal_packet(spnego_state->sub_sec_security,
126 data, length,
127 whole_pdu, pdu_length,
128 sig);
129 }
130
131 static NTSTATUS gensec_spnego_check_packet(struct gensec_security *gensec_security,
132 const uint8_t *data, size_t length,
133 const uint8_t *whole_pdu, size_t pdu_length,
134 const DATA_BLOB *sig)
135 {
136 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
137
138 if (spnego_state->state_position != SPNEGO_DONE
139 && spnego_state->state_position != SPNEGO_FALLBACK) {
140 return NT_STATUS_INVALID_PARAMETER;
141 }
142
143 return gensec_check_packet(spnego_state->sub_sec_security,
144 data, length,
145 whole_pdu, pdu_length,
146 sig);
147 }
148
149 static NTSTATUS gensec_spnego_seal_packet(struct gensec_security *gensec_security,
150 TALLOC_CTX *mem_ctx,
151 uint8_t *data, size_t length,
152 const uint8_t *whole_pdu, size_t pdu_length,
153 DATA_BLOB *sig)
154 {
155 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
156
157 if (spnego_state->state_position != SPNEGO_DONE
158 && spnego_state->state_position != SPNEGO_FALLBACK) {
159 return NT_STATUS_INVALID_PARAMETER;
160 }
161
162 return gensec_seal_packet(spnego_state->sub_sec_security,
163 mem_ctx,
164 data, length,
165 whole_pdu, pdu_length,
166 sig);
167 }
168
169 static NTSTATUS gensec_spnego_sign_packet(struct gensec_security *gensec_security,
170 TALLOC_CTX *mem_ctx,
171 const uint8_t *data, size_t length,
172 const uint8_t *whole_pdu, size_t pdu_length,
173 DATA_BLOB *sig)
174 {
175 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
176
177 if (spnego_state->state_position != SPNEGO_DONE
178 && spnego_state->state_position != SPNEGO_FALLBACK) {
179 return NT_STATUS_INVALID_PARAMETER;
180 }
181
182 return gensec_sign_packet(spnego_state->sub_sec_security,
183 mem_ctx,
184 data, length,
185 whole_pdu, pdu_length,
186 sig);
187 }
188
189 static NTSTATUS gensec_spnego_wrap(struct gensec_security *gensec_security,
190 TALLOC_CTX *mem_ctx,
191 const DATA_BLOB *in,
192 DATA_BLOB *out)
193 {
194 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
195
196 if (spnego_state->state_position != SPNEGO_DONE
197 && spnego_state->state_position != SPNEGO_FALLBACK) {
198 DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
199 return NT_STATUS_INVALID_PARAMETER;
200 }
201
202 return gensec_wrap(spnego_state->sub_sec_security,
203 mem_ctx, in, out);
204 }
205
206 static NTSTATUS gensec_spnego_unwrap(struct gensec_security *gensec_security,
207 TALLOC_CTX *mem_ctx,
208 const DATA_BLOB *in,
209 DATA_BLOB *out)
210 {
211 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
212
213 if (spnego_state->state_position != SPNEGO_DONE
214 && spnego_state->state_position != SPNEGO_FALLBACK) {
215 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
216 return NT_STATUS_INVALID_PARAMETER;
217 }
218
219 return gensec_unwrap(spnego_state->sub_sec_security,
220 mem_ctx, in, out);
221 }
222
223 static NTSTATUS gensec_spnego_wrap_packets(struct gensec_security *gensec_security,
224 TALLOC_CTX *mem_ctx,
225 const DATA_BLOB *in,
226 DATA_BLOB *out,
227 size_t *len_processed)
228 {
229 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
230
231 if (spnego_state->state_position != SPNEGO_DONE
232 && spnego_state->state_position != SPNEGO_FALLBACK) {
233 DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
234 return NT_STATUS_INVALID_PARAMETER;
235 }
236
237 return gensec_wrap_packets(spnego_state->sub_sec_security,
238 mem_ctx, in, out,
239 len_processed);
240 }
241
242 static NTSTATUS gensec_spnego_packet_full_request(struct gensec_security *gensec_security,
243 DATA_BLOB blob, size_t *size)
244 {
245 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
246
247 if (spnego_state->state_position != SPNEGO_DONE
248 && spnego_state->state_position != SPNEGO_FALLBACK) {
249 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
250 return NT_STATUS_INVALID_PARAMETER;
251 }
252
253 return gensec_packet_full_request(spnego_state->sub_sec_security,
254 blob, size);
255 }
256
257 static NTSTATUS gensec_spnego_unwrap_packets(struct gensec_security *gensec_security,
258 TALLOC_CTX *mem_ctx,
259 const DATA_BLOB *in,
260 DATA_BLOB *out,
261 size_t *len_processed)
262 {
263 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
264
265 if (spnego_state->state_position != SPNEGO_DONE
266 && spnego_state->state_position != SPNEGO_FALLBACK) {
267 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
268 return NT_STATUS_INVALID_PARAMETER;
269 }
270
271 return gensec_unwrap_packets(spnego_state->sub_sec_security,
272 mem_ctx, in, out,
273 len_processed);
274 }
275
276 static size_t gensec_spnego_sig_size(struct gensec_security *gensec_security, size_t data_size)
277 {
278 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
279
280 if (spnego_state->state_position != SPNEGO_DONE
281 && spnego_state->state_position != SPNEGO_FALLBACK) {
282 return 0;
283 }
284
285 return gensec_sig_size(spnego_state->sub_sec_security, data_size);
286 }
287
288 static size_t gensec_spnego_max_input_size(struct gensec_security *gensec_security)
289 {
290 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
291
292 if (spnego_state->state_position != SPNEGO_DONE
293 && spnego_state->state_position != SPNEGO_FALLBACK) {
294 return 0;
295 }
296
297 return gensec_max_input_size(spnego_state->sub_sec_security);
298 }
299
300 static size_t gensec_spnego_max_wrapped_size(struct gensec_security *gensec_security)
301 {
302 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
303
304 if (spnego_state->state_position != SPNEGO_DONE
305 && spnego_state->state_position != SPNEGO_FALLBACK) {
306 return 0;
307 }
308
309 return gensec_max_wrapped_size(spnego_state->sub_sec_security);
310 }
311
312 static NTSTATUS gensec_spnego_session_key(struct gensec_security *gensec_security,
313 TALLOC_CTX *mem_ctx,
314 DATA_BLOB *session_key)
315 {
316 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
317 if (!spnego_state->sub_sec_security) {
318 return NT_STATUS_INVALID_PARAMETER;
319 }
320
321 return gensec_session_key(spnego_state->sub_sec_security,
322 mem_ctx,
323 session_key);
324 }
325
326 static NTSTATUS gensec_spnego_session_info(struct gensec_security *gensec_security,
327 TALLOC_CTX *mem_ctx,
328 struct auth_session_info **session_info)
329 {
330 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
331 if (!spnego_state->sub_sec_security) {
332 return NT_STATUS_INVALID_PARAMETER;
333 }
334
335 return gensec_session_info(spnego_state->sub_sec_security,
336 mem_ctx,
337 session_info);
338 }
339
340 /** Fallback to another GENSEC mechanism, based on magic strings
341 *
342 * This is the 'fallback' case, where we don't get SPNEGO, and have to
343 * try all the other options (and hope they all have a magic string
344 * they check)
345 */
346
347 static NTSTATUS gensec_spnego_server_try_fallback(struct gensec_security *gensec_security,
348 struct spnego_state *spnego_state,
349 struct tevent_context *ev,
350 TALLOC_CTX *out_mem_ctx,
351 const DATA_BLOB in, DATA_BLOB *out)
352 {
353 int i,j;
354 struct gensec_security_ops **all_ops
355 = gensec_security_mechs(gensec_security, out_mem_ctx);
356 for (i=0; all_ops[i]; i++) {
357 bool is_spnego;
358 NTSTATUS nt_status;
359
360 if (gensec_security != NULL &&
361 !gensec_security_ops_enabled(all_ops[i], gensec_security))
362 continue;
363
364 if (!all_ops[i]->oid) {
365 continue;
366 }
367
368 is_spnego = false;
369 for (j=0; all_ops[i]->oid[j]; j++) {
370 if (strcasecmp(GENSEC_OID_SPNEGO,all_ops[i]->oid[j]) == 0) {
371 is_spnego = true;
372 }
373 }
374 if (is_spnego) {
375 continue;
376 }
377
378 if (!all_ops[i]->magic) {
379 continue;
380 }
381
382 nt_status = all_ops[i]->magic(gensec_security, &in);
383 if (!NT_STATUS_IS_OK(nt_status)) {
384 continue;
385 }
386
387 spnego_state->state_position = SPNEGO_FALLBACK;
388
389 nt_status = gensec_subcontext_start(spnego_state,
390 gensec_security,
391 &spnego_state->sub_sec_security);
392
393 if (!NT_STATUS_IS_OK(nt_status)) {
394 return nt_status;
395 }
396 /* select the sub context */
397 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
398 all_ops[i]);
399 if (!NT_STATUS_IS_OK(nt_status)) {
400 return nt_status;
401 }
402 nt_status = gensec_update(spnego_state->sub_sec_security,
403 ev, out_mem_ctx, in, out);
404 return nt_status;
405 }
406 DEBUG(1, ("Failed to parse SPNEGO request\n"));
407 return NT_STATUS_INVALID_PARAMETER;
408 }
409
410 /*
411 Parse the netTokenInit, either from the client, to the server, or
412 from the server to the client.
413 */
414
415 static NTSTATUS gensec_spnego_parse_negTokenInit(struct gensec_security *gensec_security,
416 struct spnego_state *spnego_state,
417 TALLOC_CTX *out_mem_ctx,
418 struct tevent_context *ev,
419 const char **mechType,
420 const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out)
421 {
422 int i;
423 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
424 DATA_BLOB null_data_blob = data_blob(NULL,0);
425 bool ok;
426
427 const struct gensec_security_ops_wrapper *all_sec
428 = gensec_security_by_oid_list(gensec_security,
429 out_mem_ctx,
430 mechType,
431 GENSEC_OID_SPNEGO);
432
433 ok = spnego_write_mech_types(spnego_state,
434 mechType,
435 &spnego_state->mech_types);
436 if (!ok) {
437 DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
438 return NT_STATUS_NO_MEMORY;
439 }
440
441 if (spnego_state->state_position == SPNEGO_SERVER_START) {
442 uint32_t j;
443 for (j=0; mechType && mechType[j]; j++) {
444 for (i=0; all_sec && all_sec[i].op; i++) {
445 if (strcmp(mechType[j], all_sec[i].oid) != 0) {
446 continue;
447 }
448
449 nt_status = gensec_subcontext_start(spnego_state,
450 gensec_security,
451 &spnego_state->sub_sec_security);
452 if (!NT_STATUS_IS_OK(nt_status)) {
453 return nt_status;
454 }
455 /* select the sub context */
456 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
457 all_sec[i].op);
458 if (!NT_STATUS_IS_OK(nt_status)) {
459 talloc_free(spnego_state->sub_sec_security);
460 spnego_state->sub_sec_security = NULL;
461 break;
462 }
463
464 if (j > 0) {
465 /* no optimistic token */
466 spnego_state->neg_oid = all_sec[i].oid;
467 *unwrapped_out = data_blob_null;
468 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
469 break;
470 }
471
472 nt_status = gensec_update(spnego_state->sub_sec_security,
473 out_mem_ctx,
474 ev,
475 unwrapped_in,
476 unwrapped_out);
477 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
478 NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
479 /* Pretend we never started it (lets the first run find some incompatible demand) */
480
481 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse contents: %s\n",
482 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
483 talloc_free(spnego_state->sub_sec_security);
484 spnego_state->sub_sec_security = NULL;
485 break;
486 }
487
488 spnego_state->neg_oid = all_sec[i].oid;
489 break;
490 }
491 if (spnego_state->sub_sec_security) {
492 break;
493 }
494 }
495
496 if (!spnego_state->sub_sec_security) {
497 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
498 return NT_STATUS_INVALID_PARAMETER;
499 }
500 }
501
502 /* Having tried any optimistic token from the client (if we
503 * were the server), if we didn't get anywhere, walk our list
504 * in our preference order */
505
506 if (!spnego_state->sub_sec_security) {
507 for (i=0; all_sec && all_sec[i].op; i++) {
508 nt_status = gensec_subcontext_start(spnego_state,
509 gensec_security,
510 &spnego_state->sub_sec_security);
511 if (!NT_STATUS_IS_OK(nt_status)) {
512 return nt_status;
513 }
514 /* select the sub context */
515 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
516 all_sec[i].op);
517 if (!NT_STATUS_IS_OK(nt_status)) {
518 talloc_free(spnego_state->sub_sec_security);
519 spnego_state->sub_sec_security = NULL;
520 continue;
521 }
522
523 spnego_state->neg_oid = all_sec[i].oid;
524
525 /* only get the helping start blob for the first OID */
526 nt_status = gensec_update(spnego_state->sub_sec_security,
527 out_mem_ctx,
528 ev,
529 null_data_blob,
530 unwrapped_out);
531
532 /* it is likely that a NULL input token will
533 * not be liked by most server mechs, but if
534 * we are in the client, we want the first
535 * update packet to be able to abort the use
536 * of this mech */
537 if (spnego_state->state_position != SPNEGO_SERVER_START) {
538 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
539 NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_LOGON_SERVERS) ||
540 NT_STATUS_EQUAL(nt_status, NT_STATUS_TIME_DIFFERENCE_AT_DC) ||
541 NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
542 /* Pretend we never started it (lets the first run find some incompatible demand) */
543
544 DEBUG(3, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
545 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
546 talloc_free(spnego_state->sub_sec_security);
547 spnego_state->sub_sec_security = NULL;
548 continue;
549 }
550 }
551
552 break;
553 }
554 }
555
556 if (spnego_state->sub_sec_security) {
557 /* it is likely that a NULL input token will
558 * not be liked by most server mechs, but this
559 * does the right thing in the CIFS client.
560 * just push us along the merry-go-round
561 * again, and hope for better luck next
562 * time */
563
564 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
565 *unwrapped_out = data_blob(NULL, 0);
566 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
567 }
568
569 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)
570 && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
571 && !NT_STATUS_IS_OK(nt_status)) {
572 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
573 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
574 talloc_free(spnego_state->sub_sec_security);
575 spnego_state->sub_sec_security = NULL;
576
577 /* We started the mech correctly, and the
578 * input from the other side was valid.
579 * Return the error (say bad password, invalid
580 * ticket) */
581 return nt_status;
582 }
583
584 return nt_status; /* OK, INVALID_PARAMETER ore MORE PROCESSING */
585 }
586
587 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
588 /* we could re-negotiate here, but it would only work
589 * if the client or server lied about what it could
590 * support the first time. Lets keep this code to
591 * reality */
592
593 return nt_status;
594 }
595
596 /** create a negTokenInit
597 *
598 * This is the same packet, no matter if the client or server sends it first, but it is always the first packet
599 */
600 static NTSTATUS gensec_spnego_create_negTokenInit(struct gensec_security *gensec_security,
601 struct spnego_state *spnego_state,
602 TALLOC_CTX *out_mem_ctx,
603 struct tevent_context *ev,
604 const DATA_BLOB in, DATA_BLOB *out)
605 {
606 int i;
607 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
608 DATA_BLOB null_data_blob = data_blob(NULL,0);
609 const char **mechTypes = NULL;
610 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
611 const struct gensec_security_ops_wrapper *all_sec;
612
613 mechTypes = gensec_security_oids(gensec_security,
614 out_mem_ctx, GENSEC_OID_SPNEGO);
615
616 all_sec = gensec_security_by_oid_list(gensec_security,
617 out_mem_ctx,
618 mechTypes,
619 GENSEC_OID_SPNEGO);
620 for (i=0; all_sec && all_sec[i].op; i++) {
621 struct spnego_data spnego_out;
622 const char **send_mech_types;
623 bool ok;
624
625 nt_status = gensec_subcontext_start(spnego_state,
626 gensec_security,
627 &spnego_state->sub_sec_security);
628 if (!NT_STATUS_IS_OK(nt_status)) {
629 return nt_status;
630 }
631 /* select the sub context */
632 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
633 all_sec[i].op);
634 if (!NT_STATUS_IS_OK(nt_status)) {
635 talloc_free(spnego_state->sub_sec_security);
636 spnego_state->sub_sec_security = NULL;
637 continue;
638 }
639
640 /* In the client, try and produce the first (optimistic) packet */
641 if (spnego_state->state_position == SPNEGO_CLIENT_START) {
642 nt_status = gensec_update(spnego_state->sub_sec_security,
643 out_mem_ctx,
644 ev,
645 null_data_blob,
646 &unwrapped_out);
647
648 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
649 && !NT_STATUS_IS_OK(nt_status)) {
650 DEBUG(1, ("SPNEGO(%s) creating NEG_TOKEN_INIT failed: %s\n",
651 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
652 talloc_free(spnego_state->sub_sec_security);
653 spnego_state->sub_sec_security = NULL;
654 /* Pretend we never started it (lets the first run find some incompatible demand) */
655
656 continue;
657 }
658 }
659
660 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
661
662 send_mech_types = gensec_security_oids_from_ops_wrapped(out_mem_ctx,
663 &all_sec[i]);
664
665 ok = spnego_write_mech_types(spnego_state,
666 send_mech_types,
667 &spnego_state->mech_types);
668 if (!ok) {
669 DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
670 return NT_STATUS_NO_MEMORY;
671 }
672
673 /* List the remaining mechs as options */
674 spnego_out.negTokenInit.mechTypes = send_mech_types;
675 spnego_out.negTokenInit.reqFlags = null_data_blob;
676 spnego_out.negTokenInit.reqFlagsPadding = 0;
677
678 if (spnego_state->state_position == SPNEGO_SERVER_START) {
679 spnego_out.negTokenInit.mechListMIC
680 = data_blob_string_const(ADS_IGNORE_PRINCIPAL);
681 } else {
682 spnego_out.negTokenInit.mechListMIC = null_data_blob;
683 }
684
685 spnego_out.negTokenInit.mechToken = unwrapped_out;
686
687 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
688 DEBUG(1, ("Failed to write NEG_TOKEN_INIT\n"));
689 return NT_STATUS_INVALID_PARAMETER;
690 }
691
692 /* set next state */
693 spnego_state->neg_oid = all_sec[i].oid;
694
695 if (NT_STATUS_IS_OK(nt_status)) {
696 spnego_state->no_response_expected = true;
697 }
698
699 return NT_STATUS_MORE_PROCESSING_REQUIRED;
700 }
701 talloc_free(spnego_state->sub_sec_security);
702 spnego_state->sub_sec_security = NULL;
703
704 DEBUG(1, ("Failed to setup SPNEGO negTokenInit request: %s\n", nt_errstr(nt_status)));
705 return NT_STATUS_INVALID_PARAMETER;
706 }
707
708
709 /** create a server negTokenTarg
710 *
711 * This is the case, where the client is the first one who sends data
712 */
713
714 static NTSTATUS gensec_spnego_server_negTokenTarg(struct spnego_state *spnego_state,
715 TALLOC_CTX *out_mem_ctx,
716 NTSTATUS nt_status,
717 const DATA_BLOB unwrapped_out,
718 DATA_BLOB mech_list_mic,
719 DATA_BLOB *out)
720 {
721 struct spnego_data spnego_out;
722 DATA_BLOB null_data_blob = data_blob(NULL, 0);
723
724 /* compose reply */
725 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
726 spnego_out.negTokenTarg.responseToken = unwrapped_out;
727 spnego_out.negTokenTarg.mechListMIC = null_data_blob;
728 spnego_out.negTokenTarg.supportedMech = NULL;
729
730 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
731 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
732 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
733 spnego_state->state_position = SPNEGO_SERVER_TARG;
734 } else if (NT_STATUS_IS_OK(nt_status)) {
735 if (unwrapped_out.data) {
736 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
737 }
738 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
739 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
740 spnego_state->state_position = SPNEGO_DONE;
741 } else {
742 spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
743 DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
744 spnego_state->state_position = SPNEGO_DONE;
745 }
746
747 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
748 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
749 return NT_STATUS_INVALID_PARAMETER;
750 }
751
752 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
753
754 return nt_status;
755 }
756
757
758 static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
759 struct tevent_context *ev,
760 const DATA_BLOB in, DATA_BLOB *out)
761 {
762 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
763 DATA_BLOB null_data_blob = data_blob(NULL, 0);
764 DATA_BLOB mech_list_mic = data_blob(NULL, 0);
765 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
766 struct spnego_data spnego_out;
767 struct spnego_data spnego;
768
769 ssize_t len;
770
771 *out = data_blob(NULL, 0);
772
773 if (!out_mem_ctx) {
774 out_mem_ctx = spnego_state;
775 }
776
777 /* and switch into the state machine */
778
779 switch (spnego_state->state_position) {
780 case SPNEGO_FALLBACK:
781 return gensec_update(spnego_state->sub_sec_security, ev,
782 out_mem_ctx, in, out);
783 case SPNEGO_SERVER_START:
784 {
785 NTSTATUS nt_status;
786 if (in.length) {
787
788 len = spnego_read_data(gensec_security, in, &spnego);
789 if (len == -1) {
790 return gensec_spnego_server_try_fallback(gensec_security, spnego_state,
791 out_mem_ctx, ev, in, out);
792 }
793 /* client sent NegTargetInit, we send NegTokenTarg */
794
795 /* OK, so it's real SPNEGO, check the packet's the one we expect */
796 if (spnego.type != spnego_state->expected_packet) {
797 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
798 spnego_state->expected_packet));
799 dump_data(1, in.data, in.length);
800 spnego_free_data(&spnego);
801 return NT_STATUS_INVALID_PARAMETER;
802 }
803
804 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
805 spnego_state,
806 out_mem_ctx,
807 ev,
808 spnego.negTokenInit.mechTypes,
809 spnego.negTokenInit.mechToken,
810 &unwrapped_out);
811
812 nt_status = gensec_spnego_server_negTokenTarg(spnego_state,
813 out_mem_ctx,
814 nt_status,
815 unwrapped_out,
816 null_data_blob,
817 out);
818
819 spnego_free_data(&spnego);
820
821 return nt_status;
822 } else {
823 nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
824 out_mem_ctx, ev, in, out);
825 spnego_state->state_position = SPNEGO_SERVER_START;
826 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
827 return nt_status;
828 }
829 }
830
831 case SPNEGO_CLIENT_START:
832 {
833 /* The server offers a list of mechanisms */
834
835 const char *my_mechs[] = {NULL, NULL};
836 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
837
838 if (!in.length) {
839 /* client to produce negTokenInit */
840 nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
841 out_mem_ctx, ev, in, out);
842 spnego_state->state_position = SPNEGO_CLIENT_TARG;
843 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
844 return nt_status;
845 }
846
847 len = spnego_read_data(gensec_security, in, &spnego);
848
849 if (len == -1) {
850 DEBUG(1, ("Invalid SPNEGO request:\n"));
851 dump_data(1, in.data, in.length);
852 return NT_STATUS_INVALID_PARAMETER;
853 }
854
855 /* OK, so it's real SPNEGO, check the packet's the one we expect */
856 if (spnego.type != spnego_state->expected_packet) {
857 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
858 spnego_state->expected_packet));
859 dump_data(1, in.data, in.length);
860 spnego_free_data(&spnego);
861 return NT_STATUS_INVALID_PARAMETER;
862 }
863
864 if (spnego.negTokenInit.targetPrincipal
865 && strcmp(spnego.negTokenInit.targetPrincipal, ADS_IGNORE_PRINCIPAL) != 0) {
866 DEBUG(5, ("Server claims it's principal name is %s\n", spnego.negTokenInit.targetPrincipal));
867 if (lpcfg_client_use_spnego_principal(gensec_security->settings->lp_ctx)) {
868 gensec_set_target_principal(gensec_security, spnego.negTokenInit.targetPrincipal);
869 }
870 }
871
872 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
873 spnego_state,
874 out_mem_ctx,
875 ev,
876 spnego.negTokenInit.mechTypes,
877 spnego.negTokenInit.mechToken,
878 &unwrapped_out);
879
880 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
881 spnego_free_data(&spnego);
882 return nt_status;
883 }
884
885 my_mechs[0] = spnego_state->neg_oid;
886 /* compose reply */
887 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
888 spnego_out.negTokenInit.mechTypes = my_mechs;
889 spnego_out.negTokenInit.reqFlags = null_data_blob;
890 spnego_out.negTokenInit.reqFlagsPadding = 0;
891 spnego_out.negTokenInit.mechListMIC = null_data_blob;
892 spnego_out.negTokenInit.mechToken = unwrapped_out;
893
894 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
895 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
896 return NT_STATUS_INVALID_PARAMETER;
897 }
898
899 /* set next state */
900 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
901 spnego_state->state_position = SPNEGO_CLIENT_TARG;
902
903 if (NT_STATUS_IS_OK(nt_status)) {
904 spnego_state->no_response_expected = true;
905 }
906
907 spnego_free_data(&spnego);
908 return NT_STATUS_MORE_PROCESSING_REQUIRED;
909 }
910 case SPNEGO_SERVER_TARG:
911 {
912 NTSTATUS nt_status;
913 bool new_spnego = false;
914
915 if (!in.length) {
916 return NT_STATUS_INVALID_PARAMETER;
917 }
918
919 len = spnego_read_data(gensec_security, in, &spnego);
920
921 if (len == -1) {
922 DEBUG(1, ("Invalid SPNEGO request:\n"));
923 dump_data(1, in.data, in.length);
924 return NT_STATUS_INVALID_PARAMETER;
925 }
926
927 /* OK, so it's real SPNEGO, check the packet's the one we expect */
928 if (spnego.type != spnego_state->expected_packet) {
929 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
930 spnego_state->expected_packet));
931 dump_data(1, in.data, in.length);
932 spnego_free_data(&spnego);
933 return NT_STATUS_INVALID_PARAMETER;
934 }
935
936 if (!spnego_state->sub_sec_security) {
937 DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
938 spnego_free_data(&spnego);
939 return NT_STATUS_INVALID_PARAMETER;
940 }
941
942 nt_status = gensec_update(spnego_state->sub_sec_security,
943 out_mem_ctx, ev,
944 spnego.negTokenTarg.responseToken,
945 &unwrapped_out);
946 if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
947 new_spnego = true;
948 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
949 spnego_state->mech_types.data,
950 spnego_state->mech_types.length,
951 spnego_state->mech_types.data,
952 spnego_state->mech_types.length,
953 &spnego.negTokenTarg.mechListMIC);
954 if (!NT_STATUS_IS_OK(nt_status)) {
955 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
956 nt_errstr(nt_status)));
957 }
958 }
959 if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
960 nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
961 out_mem_ctx,
962 spnego_state->mech_types.data,
963 spnego_state->mech_types.length,
964 spnego_state->mech_types.data,
965 spnego_state->mech_types.length,
966 &mech_list_mic);
967 if (!NT_STATUS_IS_OK(nt_status)) {
968 DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
969 nt_errstr(nt_status)));
970 }
971 }
972
973 nt_status = gensec_spnego_server_negTokenTarg(spnego_state,
974 out_mem_ctx,
975 nt_status,
976 unwrapped_out,
977 mech_list_mic,
978 out);
979
980 spnego_free_data(&spnego);
981
982 return nt_status;
983 }
984 case SPNEGO_CLIENT_TARG:
985 {
986 NTSTATUS nt_status;
987 if (!in.length) {
988 return NT_STATUS_INVALID_PARAMETER;
989 }
990
991 len = spnego_read_data(gensec_security, in, &spnego);
992
993 if (len == -1) {
994 DEBUG(1, ("Invalid SPNEGO request:\n"));
995 dump_data(1, in.data, in.length);
996 return NT_STATUS_INVALID_PARAMETER;
997 }
998
999 /* OK, so it's real SPNEGO, check the packet's the one we expect */
1000 if (spnego.type != spnego_state->expected_packet) {
1001 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
1002 spnego_state->expected_packet));
1003 dump_data(1, in.data, in.length);
1004 spnego_free_data(&spnego);
1005 return NT_STATUS_INVALID_PARAMETER;
1006 }
1007
1008 if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
1009 spnego_free_data(&spnego);
1010 return NT_STATUS_ACCESS_DENIED;
1011 }
1012
1013 /* Server didn't like our choice of mech, and chose something else */
1014 if ((spnego.negTokenTarg.negResult == SPNEGO_ACCEPT_INCOMPLETE) &&
1015 spnego.negTokenTarg.supportedMech &&
1016 strcmp(spnego.negTokenTarg.supportedMech, spnego_state->neg_oid) != 0) {
1017 DEBUG(3,("GENSEC SPNEGO: client preferred mech (%s) not accepted, server wants: %s\n",
1018 gensec_get_name_by_oid(gensec_security, spnego.negTokenTarg.supportedMech),
1019 gensec_get_name_by_oid(gensec_security, spnego_state->neg_oid)));
1020
1021 talloc_free(spnego_state->sub_sec_security);
1022 nt_status = gensec_subcontext_start(spnego_state,
1023 gensec_security,
1024 &spnego_state->sub_sec_security);
1025 if (!NT_STATUS_IS_OK(nt_status)) {
1026 spnego_free_data(&spnego);
1027 return nt_status;
1028 }
1029 /* select the sub context */
1030 nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
1031 spnego.negTokenTarg.supportedMech);
1032 if (!NT_STATUS_IS_OK(nt_status)) {
1033 spnego_free_data(&spnego);
1034 return nt_status;
1035 }
1036
1037 nt_status = gensec_update(spnego_state->sub_sec_security,
1038 out_mem_ctx, ev,
1039 spnego.negTokenTarg.responseToken,
1040 &unwrapped_out);
1041 spnego_state->neg_oid = talloc_strdup(spnego_state, spnego.negTokenTarg.supportedMech);
1042 } else if (spnego_state->no_response_expected) {
1043 if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1044 DEBUG(3,("GENSEC SPNEGO: client GENSEC accepted, but server rejected (bad password?)\n"));
1045 nt_status = NT_STATUS_INVALID_PARAMETER;
1046 } else if (spnego.negTokenTarg.responseToken.length) {
1047 DEBUG(2,("GENSEC SPNEGO: client GENSEC accepted, but server continued negotiation!\n"));
1048 nt_status = NT_STATUS_INVALID_PARAMETER;
1049 } else {
1050 nt_status = NT_STATUS_OK;
1051 }
1052 if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
1053 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
1054 spnego_state->mech_types.data,
1055 spnego_state->mech_types.length,
1056 spnego_state->mech_types.data,
1057 spnego_state->mech_types.length,
1058 &spnego.negTokenTarg.mechListMIC);
1059 if (!NT_STATUS_IS_OK(nt_status)) {
1060 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
1061 nt_errstr(nt_status)));
1062 }
1063 }
1064 } else {
1065 bool new_spnego = false;
1066
1067 nt_status = gensec_update(spnego_state->sub_sec_security,
1068 out_mem_ctx, ev,
1069 spnego.negTokenTarg.responseToken,
1070 &unwrapped_out);
1071
1072 if (NT_STATUS_IS_OK(nt_status)
1073 && spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1074 new_spnego = gensec_have_feature(spnego_state->sub_sec_security,
1075 GENSEC_FEATURE_NEW_SPNEGO);
1076 }
1077 if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
1078 nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
1079 out_mem_ctx,
1080 spnego_state->mech_types.data,
1081 spnego_state->mech_types.length,
1082 spnego_state->mech_types.data,
1083 spnego_state->mech_types.length,
1084 &mech_list_mic);
1085 if (!NT_STATUS_IS_OK(nt_status)) {
1086 DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
1087 nt_errstr(nt_status)));
1088 }
1089 }
1090 if (NT_STATUS_IS_OK(nt_status)) {
1091 spnego_state->no_response_expected = true;
1092 }
1093 }
1094
1095 spnego_free_data(&spnego);
1096
1097 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
1098 && !NT_STATUS_IS_OK(nt_status)) {
1099 DEBUG(1, ("SPNEGO(%s) login failed: %s\n",
1100 spnego_state->sub_sec_security->ops->name,
1101 nt_errstr(nt_status)));
1102 return nt_status;
1103 }
1104
1105 if (unwrapped_out.length || mech_list_mic.length) {
1106 /* compose reply */
1107 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
1108 spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
1109 spnego_out.negTokenTarg.supportedMech = NULL;
1110 spnego_out.negTokenTarg.responseToken = unwrapped_out;
1111 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
1112
1113 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
1114 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
1115 return NT_STATUS_INVALID_PARAMETER;
1116 }
1117
1118 spnego_state->state_position = SPNEGO_CLIENT_TARG;
1119 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
1120 } else {
1121
1122 /* all done - server has accepted, and we agree */
1123 *out = null_data_blob;
1124
1125 if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1126 /* unless of course it did not accept */
1127 DEBUG(1,("gensec_update ok but not accepted\n"));
1128 nt_status = NT_STATUS_INVALID_PARAMETER;
1129 }
1130
1131 spnego_state->state_position = SPNEGO_DONE;
1132 }
1133
1134 return nt_status;
1135 }
1136 case SPNEGO_DONE:
1137 /* We should not be called after we are 'done' */
1138 return NT_STATUS_INVALID_PARAMETER;
1139 }
1140 return NT_STATUS_INVALID_PARAMETER;
1141 }
1142
1143 static NTSTATUS gensec_spnego_update_in(struct gensec_security *gensec_security,
1144 const DATA_BLOB in, DATA_BLOB *full_in)
1145 {
1146 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1147 size_t expected;
1148 NTSTATUS status;
1149 bool ok;
1150
1151 *full_in = data_blob_null;
1152
1153 if (spnego_state->in_needed == 0) {
1154 size_t size = 0;
1155
1156 /*
1157 * try to work out the size of the full
1158 * input token, it might be fragmented
1159 */
1160 status = asn1_peek_full_tag(in, ASN1_APPLICATION(0), &size);
1161 if (!NT_STATUS_IS_OK(status) &&
1162 !NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
1163 status = asn1_peek_full_tag(in, ASN1_CONTEXT(1), &size);
1164 }
1165
1166 if (NT_STATUS_IS_OK(status) ||
1167 NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
1168 spnego_state->in_needed = size;
1169 } else {
1170 /*
1171 * If it is not an asn1 message
1172 * just call the next layer.
1173 */
1174 spnego_state->in_needed = in.length;
1175 }
1176 }
1177
1178 if (spnego_state->in_needed > UINT16_MAX) {
1179 /*
1180 * limit the incoming message to 0xFFFF
1181 * to avoid DoS attacks.
1182 */
1183 return NT_STATUS_INVALID_BUFFER_SIZE;
1184 }
1185
1186 if ((spnego_state->in_needed > 0) && (in.length == 0)) {
1187 /*
1188 * If we reach this, we know we got at least
1189 * part of an asn1 message, getting 0 means
1190 * the remote peer wants us to spin.
1191 */
1192 return NT_STATUS_INVALID_PARAMETER;
1193 }
1194
1195 expected = spnego_state->in_needed - spnego_state->in_frag.length;
1196 if (in.length > expected) {
1197 /*
1198 * we got more than expected
1199 */
1200 return NT_STATUS_INVALID_PARAMETER;
1201 }
1202
1203 if (in.length == spnego_state->in_needed) {
1204 /*
1205 * if the in.length contains the full blob
1206 * we are done.
1207 *
1208 * Note: this implies spnego_state->in_frag.length == 0,
1209 * but we do not need to check this explicitly
1210 * because we already know that we did not get
1211 * more than expected.
1212 */
1213 *full_in = in;
1214 return NT_STATUS_OK;
1215 }
1216
1217 ok = data_blob_append(spnego_state, &spnego_state->in_frag,
1218 in.data, in.length);
1219 if (!ok) {
1220 return NT_STATUS_NO_MEMORY;
1221 }
1222
1223 if (spnego_state->in_needed > spnego_state->in_frag.length) {
1224 return NT_STATUS_MORE_PROCESSING_REQUIRED;
1225 }
1226
1227 *full_in = spnego_state->in_frag;
1228 return NT_STATUS_OK;
1229 }
1230
1231 static NTSTATUS gensec_spnego_update_out(struct gensec_security *gensec_security,
1232 TALLOC_CTX *out_mem_ctx,
1233 DATA_BLOB *_out)
1234 {
1235 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1236 DATA_BLOB out = data_blob_null;
1237
1238 *_out = data_blob_null;
1239
1240 if (spnego_state->out_frag.length == 0) {
1241 return spnego_state->out_status;
1242 }
1243
1244 /*
1245 * There is still more data to be delivered
1246 * to the remote peer.
1247 */
1248
1249 if (spnego_state->out_frag.length <= spnego_state->out_max_length) {
1250 /*
1251 * Fast path, we can deliver everything
1252 */
1253
1254 *_out = spnego_state->out_frag;
1255 talloc_steal(out_mem_ctx, _out->data);
1256 spnego_state->out_frag = data_blob_null;
1257 return spnego_state->out_status;
1258 }
1259
1260 out = spnego_state->out_frag;
1261
1262 /*
1263 * copy the remaining bytes
1264 */
1265 spnego_state->out_frag = data_blob_talloc(spnego_state,
1266 out.data + spnego_state->out_max_length,
1267 out.length - spnego_state->out_max_length);
1268 if (spnego_state->out_frag.data == NULL) {
1269 return NT_STATUS_NO_MEMORY;
1270 }
1271
1272 /*
1273 * truncate the buffer
1274 */
1275 data_blob_realloc(spnego_state, &out, spnego_state->out_max_length);
1276
1277 talloc_steal(out_mem_ctx, out.data);
1278 *_out = out;
1279 return NT_STATUS_MORE_PROCESSING_REQUIRED;
1280 }
1281
1282 static NTSTATUS gensec_spnego_update_wrapper(struct gensec_security *gensec_security,
1283 TALLOC_CTX *out_mem_ctx,
1284 struct tevent_context *ev,
1285 const DATA_BLOB in, DATA_BLOB *out)
1286 {
1287 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1288 DATA_BLOB full_in = data_blob_null;
1289 NTSTATUS status;
1290
1291 *out = data_blob_null;
1292
1293 if (spnego_state->out_frag.length > 0) {
1294 if (in.length > 0) {
1295 return NT_STATUS_INVALID_PARAMETER;
1296 }
1297
1298 return gensec_spnego_update_out(gensec_security,
1299 out_mem_ctx,
1300 out);
1301 }
1302
1303 status = gensec_spnego_update_in(gensec_security,
1304 in, &full_in);
1305 if (!NT_STATUS_IS_OK(status)) {
1306 return status;
1307 }
1308
1309 status = gensec_spnego_update(gensec_security,
1310 spnego_state, ev,
1311 full_in,
1312 &spnego_state->out_frag);
1313 data_blob_free(&spnego_state->in_frag);
1314 spnego_state->in_needed = 0;
1315 if (!NT_STATUS_IS_OK(status) &&
1316 !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
1317 return status;
1318 }
1319
1320 spnego_state->out_status = status;
1321
1322 return gensec_spnego_update_out(gensec_security,
1323 out_mem_ctx,
1324 out);
1325 }
1326
1327 static void gensec_spnego_want_feature(struct gensec_security *gensec_security,
1328 uint32_t feature)
1329 {
1330 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1331
1332 if (!spnego_state || !spnego_state->sub_sec_security) {
1333 gensec_security->want_features |= feature;
1334 return;
1335 }
1336
1337 gensec_want_feature(spnego_state->sub_sec_security,
1338 feature);
1339 }
1340
1341 static bool gensec_spnego_have_feature(struct gensec_security *gensec_security,
1342 uint32_t feature)
1343 {
1344 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1345 if (!spnego_state->sub_sec_security) {
1346 return false;
1347 }
1348
1349 return gensec_have_feature(spnego_state->sub_sec_security,
1350 feature);
1351 }
1352
1353 static NTTIME gensec_spnego_expire_time(struct gensec_security *gensec_security)
1354 {
1355 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1356
1357 if (!spnego_state->sub_sec_security) {
1358 return GENSEC_EXPIRE_TIME_INFINITY;
1359 }
1360
1361 return gensec_expire_time(spnego_state->sub_sec_security);
1362 }
1363
1364 static const char *gensec_spnego_oids[] = {
1365 GENSEC_OID_SPNEGO,
1366 NULL
1367 };
1368
1369 static const struct gensec_security_ops gensec_spnego_security_ops = {
1370 .name = "spnego",
1371 .sasl_name = "GSS-SPNEGO",
1372 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1373 .oid = gensec_spnego_oids,
1374 .client_start = gensec_spnego_client_start,
1375 .server_start = gensec_spnego_server_start,
1376 .update = gensec_spnego_update_wrapper,
1377 .seal_packet = gensec_spnego_seal_packet,
1378 .sign_packet = gensec_spnego_sign_packet,
1379 .sig_size = gensec_spnego_sig_size,
1380 .max_wrapped_size = gensec_spnego_max_wrapped_size,
1381 .max_input_size = gensec_spnego_max_input_size,
1382 .check_packet = gensec_spnego_check_packet,
1383 .unseal_packet = gensec_spnego_unseal_packet,
1384 .packet_full_request = gensec_spnego_packet_full_request,
1385 .wrap = gensec_spnego_wrap,
1386 .unwrap = gensec_spnego_unwrap,
1387 .wrap_packets = gensec_spnego_wrap_packets,
1388 .unwrap_packets = gensec_spnego_unwrap_packets,
1389 .session_key = gensec_spnego_session_key,
1390 .session_info = gensec_spnego_session_info,
1391 .want_feature = gensec_spnego_want_feature,
1392 .have_feature = gensec_spnego_have_feature,
1393 .expire_time = gensec_spnego_expire_time,
1394 .enabled = true,
1395 .priority = GENSEC_SPNEGO
1396 };
1397
1398 _PUBLIC_ NTSTATUS gensec_spnego_init(void)
1399 {
1400 NTSTATUS ret;
1401 ret = gensec_register(&gensec_spnego_security_ops);
1402 if (!NT_STATUS_IS_OK(ret)) {
1403 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1404 gensec_spnego_security_ops.name));
1405 return ret;
1406 }
1407
1408 return ret;
1409 }
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