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s4-drs: do not try to contact for replication servers that are not anymore in reps*
[Samba/gebeck_regimport.git] / source4 / auth / gensec / spnego.c
blobfae32d8ade48793583c9f2e9ed55cb5530fe40d0
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 "auth/gensec/gensec_proto.h"
31 #include "auth/gensec/gensec_toplevel_proto.h"
32 #include "param/param.h"
33
34 _PUBLIC_ NTSTATUS gensec_spnego_init(void);
35
36 enum spnego_state_position {
37 SPNEGO_SERVER_START,
38 SPNEGO_CLIENT_START,
39 SPNEGO_SERVER_TARG,
40 SPNEGO_CLIENT_TARG,
41 SPNEGO_FALLBACK,
42 SPNEGO_DONE
43 };
44
45 struct spnego_state {
46 enum spnego_message_type expected_packet;
47 enum spnego_state_position state_position;
48 struct gensec_security *sub_sec_security;
49 bool no_response_expected;
50
51 const char *neg_oid;
52
53 DATA_BLOB mech_types;
54 };
55
56
57 static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_security)
58 {
59 struct spnego_state *spnego_state;
60
61 spnego_state = talloc(gensec_security, struct spnego_state);
62 if (!spnego_state) {
63 return NT_STATUS_NO_MEMORY;
64 }
65
66 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
67 spnego_state->state_position = SPNEGO_CLIENT_START;
68 spnego_state->sub_sec_security = NULL;
69 spnego_state->no_response_expected = false;
70 spnego_state->mech_types = data_blob(NULL, 0);
71
72 gensec_security->private_data = spnego_state;
73 return NT_STATUS_OK;
74 }
75
76 static NTSTATUS gensec_spnego_server_start(struct gensec_security *gensec_security)
77 {
78 struct spnego_state *spnego_state;
79
80 spnego_state = talloc(gensec_security, struct spnego_state);
81 if (!spnego_state) {
82 return NT_STATUS_NO_MEMORY;
83 }
84
85 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
86 spnego_state->state_position = SPNEGO_SERVER_START;
87 spnego_state->sub_sec_security = NULL;
88 spnego_state->no_response_expected = false;
89 spnego_state->mech_types = data_blob(NULL, 0);
90
91 gensec_security->private_data = spnego_state;
92 return NT_STATUS_OK;
93 }
94
95 /*
96 wrappers for the spnego_*() functions
97 */
98 static NTSTATUS gensec_spnego_unseal_packet(struct gensec_security *gensec_security,
99 uint8_t *data, size_t length,
100 const uint8_t *whole_pdu, size_t pdu_length,
101 const DATA_BLOB *sig)
102 {
103 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
104
105 if (spnego_state->state_position != SPNEGO_DONE
106 && spnego_state->state_position != SPNEGO_FALLBACK) {
107 return NT_STATUS_INVALID_PARAMETER;
108 }
109
110 return gensec_unseal_packet(spnego_state->sub_sec_security,
111 data, length,
112 whole_pdu, pdu_length,
113 sig);
114 }
115
116 static NTSTATUS gensec_spnego_check_packet(struct gensec_security *gensec_security,
117 const uint8_t *data, size_t length,
118 const uint8_t *whole_pdu, size_t pdu_length,
119 const DATA_BLOB *sig)
120 {
121 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
122
123 if (spnego_state->state_position != SPNEGO_DONE
124 && spnego_state->state_position != SPNEGO_FALLBACK) {
125 return NT_STATUS_INVALID_PARAMETER;
126 }
127
128 return gensec_check_packet(spnego_state->sub_sec_security,
129 data, length,
130 whole_pdu, pdu_length,
131 sig);
132 }
133
134 static NTSTATUS gensec_spnego_seal_packet(struct gensec_security *gensec_security,
135 TALLOC_CTX *mem_ctx,
136 uint8_t *data, size_t length,
137 const uint8_t *whole_pdu, size_t pdu_length,
138 DATA_BLOB *sig)
139 {
140 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
141
142 if (spnego_state->state_position != SPNEGO_DONE
143 && spnego_state->state_position != SPNEGO_FALLBACK) {
144 return NT_STATUS_INVALID_PARAMETER;
145 }
146
147 return gensec_seal_packet(spnego_state->sub_sec_security,
148 mem_ctx,
149 data, length,
150 whole_pdu, pdu_length,
151 sig);
152 }
153
154 static NTSTATUS gensec_spnego_sign_packet(struct gensec_security *gensec_security,
155 TALLOC_CTX *mem_ctx,
156 const uint8_t *data, size_t length,
157 const uint8_t *whole_pdu, size_t pdu_length,
158 DATA_BLOB *sig)
159 {
160 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
161
162 if (spnego_state->state_position != SPNEGO_DONE
163 && spnego_state->state_position != SPNEGO_FALLBACK) {
164 return NT_STATUS_INVALID_PARAMETER;
165 }
166
167 return gensec_sign_packet(spnego_state->sub_sec_security,
168 mem_ctx,
169 data, length,
170 whole_pdu, pdu_length,
171 sig);
172 }
173
174 static NTSTATUS gensec_spnego_wrap(struct gensec_security *gensec_security,
175 TALLOC_CTX *mem_ctx,
176 const DATA_BLOB *in,
177 DATA_BLOB *out)
178 {
179 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
180
181 if (spnego_state->state_position != SPNEGO_DONE
182 && spnego_state->state_position != SPNEGO_FALLBACK) {
183 DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
184 return NT_STATUS_INVALID_PARAMETER;
185 }
186
187 return gensec_wrap(spnego_state->sub_sec_security,
188 mem_ctx, in, out);
189 }
190
191 static NTSTATUS gensec_spnego_unwrap(struct gensec_security *gensec_security,
192 TALLOC_CTX *mem_ctx,
193 const DATA_BLOB *in,
194 DATA_BLOB *out)
195 {
196 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
197
198 if (spnego_state->state_position != SPNEGO_DONE
199 && spnego_state->state_position != SPNEGO_FALLBACK) {
200 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
201 return NT_STATUS_INVALID_PARAMETER;
202 }
203
204 return gensec_unwrap(spnego_state->sub_sec_security,
205 mem_ctx, in, out);
206 }
207
208 static NTSTATUS gensec_spnego_wrap_packets(struct gensec_security *gensec_security,
209 TALLOC_CTX *mem_ctx,
210 const DATA_BLOB *in,
211 DATA_BLOB *out,
212 size_t *len_processed)
213 {
214 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
215
216 if (spnego_state->state_position != SPNEGO_DONE
217 && spnego_state->state_position != SPNEGO_FALLBACK) {
218 DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
219 return NT_STATUS_INVALID_PARAMETER;
220 }
221
222 return gensec_wrap_packets(spnego_state->sub_sec_security,
223 mem_ctx, in, out,
224 len_processed);
225 }
226
227 static NTSTATUS gensec_spnego_packet_full_request(struct gensec_security *gensec_security,
228 DATA_BLOB blob, size_t *size)
229 {
230 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
231
232 if (spnego_state->state_position != SPNEGO_DONE
233 && spnego_state->state_position != SPNEGO_FALLBACK) {
234 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
235 return NT_STATUS_INVALID_PARAMETER;
236 }
237
238 return gensec_packet_full_request(spnego_state->sub_sec_security,
239 blob, size);
240 }
241
242 static NTSTATUS gensec_spnego_unwrap_packets(struct gensec_security *gensec_security,
243 TALLOC_CTX *mem_ctx,
244 const DATA_BLOB *in,
245 DATA_BLOB *out,
246 size_t *len_processed)
247 {
248 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
249
250 if (spnego_state->state_position != SPNEGO_DONE
251 && spnego_state->state_position != SPNEGO_FALLBACK) {
252 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
253 return NT_STATUS_INVALID_PARAMETER;
254 }
255
256 return gensec_unwrap_packets(spnego_state->sub_sec_security,
257 mem_ctx, in, out,
258 len_processed);
259 }
260
261 static size_t gensec_spnego_sig_size(struct gensec_security *gensec_security, size_t data_size)
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 return 0;
268 }
269
270 return gensec_sig_size(spnego_state->sub_sec_security, data_size);
271 }
272
273 static size_t gensec_spnego_max_input_size(struct gensec_security *gensec_security)
274 {
275 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
276
277 if (spnego_state->state_position != SPNEGO_DONE
278 && spnego_state->state_position != SPNEGO_FALLBACK) {
279 return 0;
280 }
281
282 return gensec_max_input_size(spnego_state->sub_sec_security);
283 }
284
285 static size_t gensec_spnego_max_wrapped_size(struct gensec_security *gensec_security)
286 {
287 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
288
289 if (spnego_state->state_position != SPNEGO_DONE
290 && spnego_state->state_position != SPNEGO_FALLBACK) {
291 return 0;
292 }
293
294 return gensec_max_wrapped_size(spnego_state->sub_sec_security);
295 }
296
297 static NTSTATUS gensec_spnego_session_key(struct gensec_security *gensec_security,
298 TALLOC_CTX *mem_ctx,
299 DATA_BLOB *session_key)
300 {
301 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
302 if (!spnego_state->sub_sec_security) {
303 return NT_STATUS_INVALID_PARAMETER;
304 }
305
306 return gensec_session_key(spnego_state->sub_sec_security,
307 mem_ctx,
308 session_key);
309 }
310
311 static NTSTATUS gensec_spnego_session_info(struct gensec_security *gensec_security,
312 TALLOC_CTX *mem_ctx,
313 struct auth_session_info **session_info)
314 {
315 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
316 if (!spnego_state->sub_sec_security) {
317 return NT_STATUS_INVALID_PARAMETER;
318 }
319
320 return gensec_session_info(spnego_state->sub_sec_security,
321 mem_ctx,
322 session_info);
323 }
324
325 /** Fallback to another GENSEC mechanism, based on magic strings
326 *
327 * This is the 'fallback' case, where we don't get SPNEGO, and have to
328 * try all the other options (and hope they all have a magic string
329 * they check)
330 */
331
332 static NTSTATUS gensec_spnego_server_try_fallback(struct gensec_security *gensec_security,
333 struct spnego_state *spnego_state,
334 struct tevent_context *ev,
335 TALLOC_CTX *out_mem_ctx,
336 const DATA_BLOB in, DATA_BLOB *out)
337 {
338 int i,j;
339 struct gensec_security_ops **all_ops
340 = gensec_security_mechs(gensec_security, out_mem_ctx);
341 for (i=0; all_ops[i]; i++) {
342 bool is_spnego;
343 NTSTATUS nt_status;
344
345 if (gensec_security != NULL &&
346 !gensec_security_ops_enabled(all_ops[i], gensec_security))
347 continue;
348
349 if (!all_ops[i]->oid) {
350 continue;
351 }
352
353 is_spnego = false;
354 for (j=0; all_ops[i]->oid[j]; j++) {
355 if (strcasecmp(GENSEC_OID_SPNEGO,all_ops[i]->oid[j]) == 0) {
356 is_spnego = true;
357 }
358 }
359 if (is_spnego) {
360 continue;
361 }
362
363 if (!all_ops[i]->magic) {
364 continue;
365 }
366
367 nt_status = all_ops[i]->magic(gensec_security, &in);
368 if (!NT_STATUS_IS_OK(nt_status)) {
369 continue;
370 }
371
372 spnego_state->state_position = SPNEGO_FALLBACK;
373
374 nt_status = gensec_subcontext_start(spnego_state,
375 gensec_security,
376 &spnego_state->sub_sec_security);
377
378 if (!NT_STATUS_IS_OK(nt_status)) {
379 return nt_status;
380 }
381 /* select the sub context */
382 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
383 all_ops[i]);
384 if (!NT_STATUS_IS_OK(nt_status)) {
385 return nt_status;
386 }
387 nt_status = gensec_update(spnego_state->sub_sec_security,
388 ev, out_mem_ctx, in, out);
389 return nt_status;
390 }
391 DEBUG(1, ("Failed to parse SPNEGO request\n"));
392 return NT_STATUS_INVALID_PARAMETER;
393
394 }
395
396 /*
397 Parse the netTokenInit, either from the client, to the server, or
398 from the server to the client.
399 */
400
401 static NTSTATUS gensec_spnego_parse_negTokenInit(struct gensec_security *gensec_security,
402 struct spnego_state *spnego_state,
403 TALLOC_CTX *out_mem_ctx,
404 struct tevent_context *ev,
405 const char **mechType,
406 const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out)
407 {
408 int i;
409 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
410 DATA_BLOB null_data_blob = data_blob(NULL,0);
411 bool ok;
412
413 const struct gensec_security_ops_wrapper *all_sec
414 = gensec_security_by_oid_list(gensec_security,
415 out_mem_ctx,
416 mechType,
417 GENSEC_OID_SPNEGO);
418
419 ok = spnego_write_mech_types(spnego_state,
420 mechType,
421 &spnego_state->mech_types);
422 if (!ok) {
423 DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
424 return NT_STATUS_NO_MEMORY;
425 }
426
427 if (spnego_state->state_position == SPNEGO_SERVER_START) {
428 uint32_t j;
429 for (j=0; mechType && mechType[j]; j++) {
430 for (i=0; all_sec && all_sec[i].op; i++) {
431 if (strcmp(mechType[j], all_sec[i].oid) != 0) {
432 continue;
433 }
434
435 nt_status = gensec_subcontext_start(spnego_state,
436 gensec_security,
437 &spnego_state->sub_sec_security);
438 if (!NT_STATUS_IS_OK(nt_status)) {
439 return nt_status;
440 }
441 /* select the sub context */
442 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
443 all_sec[i].op);
444 if (!NT_STATUS_IS_OK(nt_status)) {
445 talloc_free(spnego_state->sub_sec_security);
446 spnego_state->sub_sec_security = NULL;
447 break;
448 }
449
450 if (j > 0) {
451 /* no optimistic token */
452 spnego_state->neg_oid = all_sec[i].oid;
453 *unwrapped_out = data_blob_null;
454 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
455 break;
456 }
457
458 nt_status = gensec_update(spnego_state->sub_sec_security,
459 out_mem_ctx,
460 ev,
461 unwrapped_in,
462 unwrapped_out);
463 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
464 NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
465 /* Pretend we never started it (lets the first run find some incompatible demand) */
466
467 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse contents: %s\n",
468 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
469 talloc_free(spnego_state->sub_sec_security);
470 spnego_state->sub_sec_security = NULL;
471 break;
472 }
473
474 spnego_state->neg_oid = all_sec[i].oid;
475 break;
476 }
477 if (spnego_state->sub_sec_security) {
478 break;
479 }
480 }
481
482 if (!spnego_state->sub_sec_security) {
483 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
484 return NT_STATUS_INVALID_PARAMETER;
485 }
486 }
487
488 /* Having tried any optimistic token from the client (if we
489 * were the server), if we didn't get anywhere, walk our list
490 * in our preference order */
491
492 if (!spnego_state->sub_sec_security) {
493 for (i=0; all_sec && all_sec[i].op; i++) {
494 nt_status = gensec_subcontext_start(spnego_state,
495 gensec_security,
496 &spnego_state->sub_sec_security);
497 if (!NT_STATUS_IS_OK(nt_status)) {
498 return nt_status;
499 }
500 /* select the sub context */
501 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
502 all_sec[i].op);
503 if (!NT_STATUS_IS_OK(nt_status)) {
504 talloc_free(spnego_state->sub_sec_security);
505 spnego_state->sub_sec_security = NULL;
506 continue;
507 }
508
509 spnego_state->neg_oid = all_sec[i].oid;
510
511 /* only get the helping start blob for the first OID */
512 nt_status = gensec_update(spnego_state->sub_sec_security,
513 out_mem_ctx,
514 ev,
515 null_data_blob,
516 unwrapped_out);
517
518 /* it is likely that a NULL input token will
519 * not be liked by most server mechs, but if
520 * we are in the client, we want the first
521 * update packet to be able to abort the use
522 * of this mech */
523 if (spnego_state->state_position != SPNEGO_SERVER_START) {
524 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
525 NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_LOGON_SERVERS) ||
526 NT_STATUS_EQUAL(nt_status, NT_STATUS_TIME_DIFFERENCE_AT_DC) ||
527 NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
528 /* Pretend we never started it (lets the first run find some incompatible demand) */
529
530 DEBUG(3, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
531 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
532 talloc_free(spnego_state->sub_sec_security);
533 spnego_state->sub_sec_security = NULL;
534 continue;
535 }
536 }
537
538 break;
539 }
540 }
541
542 if (spnego_state->sub_sec_security) {
543 /* it is likely that a NULL input token will
544 * not be liked by most server mechs, but this
545 * does the right thing in the CIFS client.
546 * just push us along the merry-go-round
547 * again, and hope for better luck next
548 * time */
549
550 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
551 *unwrapped_out = data_blob(NULL, 0);
552 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
553 }
554
555 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)
556 && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
557 && !NT_STATUS_IS_OK(nt_status)) {
558 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
559 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
560 talloc_free(spnego_state->sub_sec_security);
561 spnego_state->sub_sec_security = NULL;
562
563 /* We started the mech correctly, and the
564 * input from the other side was valid.
565 * Return the error (say bad password, invalid
566 * ticket) */
567 return nt_status;
568 }
569
570
571 return nt_status; /* OK, INVALID_PARAMETER ore MORE PROCESSING */
572 }
573
574 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
575 /* we could re-negotiate here, but it would only work
576 * if the client or server lied about what it could
577 * support the first time. Lets keep this code to
578 * reality */
579
580 return nt_status;
581 }
582
583 /** create a negTokenInit
584 *
585 * This is the same packet, no matter if the client or server sends it first, but it is always the first packet
586 */
587 static NTSTATUS gensec_spnego_create_negTokenInit(struct gensec_security *gensec_security,
588 struct spnego_state *spnego_state,
589 TALLOC_CTX *out_mem_ctx,
590 struct tevent_context *ev,
591 const DATA_BLOB in, DATA_BLOB *out)
592 {
593 int i;
594 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
595 DATA_BLOB null_data_blob = data_blob(NULL,0);
596 const char **mechTypes = NULL;
597 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
598 const struct gensec_security_ops_wrapper *all_sec;
599
600 mechTypes = gensec_security_oids(gensec_security,
601 out_mem_ctx, GENSEC_OID_SPNEGO);
602
603 all_sec = gensec_security_by_oid_list(gensec_security,
604 out_mem_ctx,
605 mechTypes,
606 GENSEC_OID_SPNEGO);
607 for (i=0; all_sec && all_sec[i].op; i++) {
608 struct spnego_data spnego_out;
609 const char **send_mech_types;
610 bool ok;
611
612 nt_status = gensec_subcontext_start(spnego_state,
613 gensec_security,
614 &spnego_state->sub_sec_security);
615 if (!NT_STATUS_IS_OK(nt_status)) {
616 return nt_status;
617 }
618 /* select the sub context */
619 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
620 all_sec[i].op);
621 if (!NT_STATUS_IS_OK(nt_status)) {
622 talloc_free(spnego_state->sub_sec_security);
623 spnego_state->sub_sec_security = NULL;
624 continue;
625 }
626
627 /* In the client, try and produce the first (optimistic) packet */
628 if (spnego_state->state_position == SPNEGO_CLIENT_START) {
629 nt_status = gensec_update(spnego_state->sub_sec_security,
630 out_mem_ctx,
631 ev,
632 null_data_blob,
633 &unwrapped_out);
634
635 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
636 && !NT_STATUS_IS_OK(nt_status)) {
637 DEBUG(1, ("SPNEGO(%s) creating NEG_TOKEN_INIT failed: %s\n",
638 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
639 talloc_free(spnego_state->sub_sec_security);
640 spnego_state->sub_sec_security = NULL;
641 /* Pretend we never started it (lets the first run find some incompatible demand) */
642
643 continue;
644 }
645 }
646
647 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
648
649 send_mech_types = gensec_security_oids_from_ops_wrapped(out_mem_ctx,
650 &all_sec[i]);
651
652 ok = spnego_write_mech_types(spnego_state,
653 send_mech_types,
654 &spnego_state->mech_types);
655 if (!ok) {
656 DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
657 return NT_STATUS_NO_MEMORY;
658 }
659
660 /* List the remaining mechs as options */
661 spnego_out.negTokenInit.mechTypes = send_mech_types;
662 spnego_out.negTokenInit.reqFlags = null_data_blob;
663 spnego_out.negTokenInit.reqFlagsPadding = 0;
664
665 if (spnego_state->state_position == SPNEGO_SERVER_START) {
666 spnego_out.negTokenInit.mechListMIC
667 = data_blob_string_const(ADS_IGNORE_PRINCIPAL);
668 } else {
669 spnego_out.negTokenInit.mechListMIC = null_data_blob;
670 }
671
672 spnego_out.negTokenInit.mechToken = unwrapped_out;
673
674 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
675 DEBUG(1, ("Failed to write NEG_TOKEN_INIT\n"));
676 return NT_STATUS_INVALID_PARAMETER;
677 }
678
679 /* set next state */
680 spnego_state->neg_oid = all_sec[i].oid;
681
682 if (NT_STATUS_IS_OK(nt_status)) {
683 spnego_state->no_response_expected = true;
684 }
685
686 return NT_STATUS_MORE_PROCESSING_REQUIRED;
687 }
688 talloc_free(spnego_state->sub_sec_security);
689 spnego_state->sub_sec_security = NULL;
690
691 DEBUG(1, ("Failed to setup SPNEGO negTokenInit request: %s\n", nt_errstr(nt_status)));
692 return NT_STATUS_INVALID_PARAMETER;
693 }
694
695
696 /** create a server negTokenTarg
697 *
698 * This is the case, where the client is the first one who sends data
699 */
700
701 static NTSTATUS gensec_spnego_server_negTokenTarg(struct gensec_security *gensec_security,
702 struct spnego_state *spnego_state,
703 TALLOC_CTX *out_mem_ctx,
704 NTSTATUS nt_status,
705 const DATA_BLOB unwrapped_out,
706 DATA_BLOB mech_list_mic,
707 DATA_BLOB *out)
708 {
709 struct spnego_data spnego_out;
710 DATA_BLOB null_data_blob = data_blob(NULL, 0);
711
712 /* compose reply */
713 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
714 spnego_out.negTokenTarg.responseToken = unwrapped_out;
715 spnego_out.negTokenTarg.mechListMIC = null_data_blob;
716 spnego_out.negTokenTarg.supportedMech = NULL;
717
718 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
719 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
720 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
721 spnego_state->state_position = SPNEGO_SERVER_TARG;
722 } else if (NT_STATUS_IS_OK(nt_status)) {
723 if (unwrapped_out.data) {
724 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
725 }
726 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
727 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
728 spnego_state->state_position = SPNEGO_DONE;
729 } else {
730 spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
731 DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
732 spnego_state->state_position = SPNEGO_DONE;
733 }
734
735 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
736 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
737 return NT_STATUS_INVALID_PARAMETER;
738 }
739
740 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
741
742 return nt_status;
743 }
744
745
746 static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
747 struct tevent_context *ev,
748 const DATA_BLOB in, DATA_BLOB *out)
749 {
750 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
751 DATA_BLOB null_data_blob = data_blob(NULL, 0);
752 DATA_BLOB mech_list_mic = data_blob(NULL, 0);
753 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
754 struct spnego_data spnego_out;
755 struct spnego_data spnego;
756
757 ssize_t len;
758
759 *out = data_blob(NULL, 0);
760
761 if (!out_mem_ctx) {
762 out_mem_ctx = spnego_state;
763 }
764
765 /* and switch into the state machine */
766
767 switch (spnego_state->state_position) {
768 case SPNEGO_FALLBACK:
769 return gensec_update(spnego_state->sub_sec_security, ev,
770 out_mem_ctx, in, out);
771 case SPNEGO_SERVER_START:
772 {
773 NTSTATUS nt_status;
774 if (in.length) {
775
776 len = spnego_read_data(gensec_security, in, &spnego);
777 if (len == -1) {
778 return gensec_spnego_server_try_fallback(gensec_security, spnego_state,
779 out_mem_ctx, ev, in, out);
780 }
781 /* client sent NegTargetInit, we send NegTokenTarg */
782
783 /* OK, so it's real SPNEGO, check the packet's the one we expect */
784 if (spnego.type != spnego_state->expected_packet) {
785 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
786 spnego_state->expected_packet));
787 dump_data(1, in.data, in.length);
788 spnego_free_data(&spnego);
789 return NT_STATUS_INVALID_PARAMETER;
790 }
791
792 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
793 spnego_state,
794 out_mem_ctx,
795 ev,
796 spnego.negTokenInit.mechTypes,
797 spnego.negTokenInit.mechToken,
798 &unwrapped_out);
799
800 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
801 spnego_state,
802 out_mem_ctx,
803 nt_status,
804 unwrapped_out,
805 null_data_blob,
806 out);
807
808 spnego_free_data(&spnego);
809
810 return nt_status;
811 } else {
812 nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
813 out_mem_ctx, ev, in, out);
814 spnego_state->state_position = SPNEGO_SERVER_START;
815 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
816 return nt_status;
817 }
818 }
819
820 case SPNEGO_CLIENT_START:
821 {
822 /* The server offers a list of mechanisms */
823
824 const char *my_mechs[] = {NULL, NULL};
825 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
826
827 if (!in.length) {
828 /* client to produce negTokenInit */
829 nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
830 out_mem_ctx, ev, in, out);
831 spnego_state->state_position = SPNEGO_CLIENT_TARG;
832 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
833 return nt_status;
834 }
835
836 len = spnego_read_data(gensec_security, in, &spnego);
837
838 if (len == -1) {
839 DEBUG(1, ("Invalid SPNEGO request:\n"));
840 dump_data(1, in.data, in.length);
841 return NT_STATUS_INVALID_PARAMETER;
842 }
843
844 /* OK, so it's real SPNEGO, check the packet's the one we expect */
845 if (spnego.type != spnego_state->expected_packet) {
846 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
847 spnego_state->expected_packet));
848 dump_data(1, in.data, in.length);
849 spnego_free_data(&spnego);
850 return NT_STATUS_INVALID_PARAMETER;
851 }
852
853 if (spnego.negTokenInit.targetPrincipal
854 && strcmp(spnego.negTokenInit.targetPrincipal, ADS_IGNORE_PRINCIPAL) != 0) {
855 DEBUG(5, ("Server claims it's principal name is %s\n", spnego.negTokenInit.targetPrincipal));
856 if (lpcfg_client_use_spnego_principal(gensec_security->settings->lp_ctx)) {
857 gensec_set_target_principal(gensec_security, spnego.negTokenInit.targetPrincipal);
858 }
859 }
860
861 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
862 spnego_state,
863 out_mem_ctx,
864 ev,
865 spnego.negTokenInit.mechTypes,
866 spnego.negTokenInit.mechToken,
867 &unwrapped_out);
868
869 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
870 spnego_free_data(&spnego);
871 return nt_status;
872 }
873
874 my_mechs[0] = spnego_state->neg_oid;
875 /* compose reply */
876 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
877 spnego_out.negTokenInit.mechTypes = my_mechs;
878 spnego_out.negTokenInit.reqFlags = null_data_blob;
879 spnego_out.negTokenInit.reqFlagsPadding = 0;
880 spnego_out.negTokenInit.mechListMIC = null_data_blob;
881 spnego_out.negTokenInit.mechToken = unwrapped_out;
882
883 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
884 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
885 return NT_STATUS_INVALID_PARAMETER;
886 }
887
888 /* set next state */
889 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
890 spnego_state->state_position = SPNEGO_CLIENT_TARG;
891
892 if (NT_STATUS_IS_OK(nt_status)) {
893 spnego_state->no_response_expected = true;
894 }
895
896 spnego_free_data(&spnego);
897 return NT_STATUS_MORE_PROCESSING_REQUIRED;
898 }
899 case SPNEGO_SERVER_TARG:
900 {
901 NTSTATUS nt_status;
902 bool new_spnego = false;
903
904 if (!in.length) {
905 return NT_STATUS_INVALID_PARAMETER;
906 }
907
908 len = spnego_read_data(gensec_security, in, &spnego);
909
910 if (len == -1) {
911 DEBUG(1, ("Invalid SPNEGO request:\n"));
912 dump_data(1, in.data, in.length);
913 return NT_STATUS_INVALID_PARAMETER;
914 }
915
916 /* OK, so it's real SPNEGO, check the packet's the one we expect */
917 if (spnego.type != spnego_state->expected_packet) {
918 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
919 spnego_state->expected_packet));
920 dump_data(1, in.data, in.length);
921 spnego_free_data(&spnego);
922 return NT_STATUS_INVALID_PARAMETER;
923 }
924
925 if (!spnego_state->sub_sec_security) {
926 DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
927 spnego_free_data(&spnego);
928 return NT_STATUS_INVALID_PARAMETER;
929 }
930
931 nt_status = gensec_update(spnego_state->sub_sec_security,
932 out_mem_ctx, ev,
933 spnego.negTokenTarg.responseToken,
934 &unwrapped_out);
935 if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
936 new_spnego = true;
937 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
938 spnego_state->mech_types.data,
939 spnego_state->mech_types.length,
940 spnego_state->mech_types.data,
941 spnego_state->mech_types.length,
942 &spnego.negTokenTarg.mechListMIC);
943 if (!NT_STATUS_IS_OK(nt_status)) {
944 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
945 nt_errstr(nt_status)));
946 }
947 }
948 if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
949 nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
950 out_mem_ctx,
951 spnego_state->mech_types.data,
952 spnego_state->mech_types.length,
953 spnego_state->mech_types.data,
954 spnego_state->mech_types.length,
955 &mech_list_mic);
956 if (!NT_STATUS_IS_OK(nt_status)) {
957 DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
958 nt_errstr(nt_status)));
959 }
960 }
961
962 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
963 spnego_state,
964 out_mem_ctx,
965 nt_status,
966 unwrapped_out,
967 mech_list_mic,
968 out);
969
970 spnego_free_data(&spnego);
971
972 return nt_status;
973 }
974 case SPNEGO_CLIENT_TARG:
975 {
976 NTSTATUS nt_status;
977 if (!in.length) {
978 return NT_STATUS_INVALID_PARAMETER;
979 }
980
981 len = spnego_read_data(gensec_security, in, &spnego);
982
983 if (len == -1) {
984 DEBUG(1, ("Invalid SPNEGO request:\n"));
985 dump_data(1, in.data, in.length);
986 return NT_STATUS_INVALID_PARAMETER;
987 }
988
989 /* OK, so it's real SPNEGO, check the packet's the one we expect */
990 if (spnego.type != spnego_state->expected_packet) {
991 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
992 spnego_state->expected_packet));
993 dump_data(1, in.data, in.length);
994 spnego_free_data(&spnego);
995 return NT_STATUS_INVALID_PARAMETER;
996 }
997
998 if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
999 spnego_free_data(&spnego);
1000 return NT_STATUS_ACCESS_DENIED;
1001 }
1002
1003 /* Server didn't like our choice of mech, and chose something else */
1004 if ((spnego.negTokenTarg.negResult == SPNEGO_ACCEPT_INCOMPLETE) &&
1005 spnego.negTokenTarg.supportedMech &&
1006 strcmp(spnego.negTokenTarg.supportedMech, spnego_state->neg_oid) != 0) {
1007 DEBUG(3,("GENSEC SPNEGO: client preferred mech (%s) not accepted, server wants: %s\n",
1008 gensec_get_name_by_oid(gensec_security, spnego.negTokenTarg.supportedMech),
1009 gensec_get_name_by_oid(gensec_security, spnego_state->neg_oid)));
1010
1011 talloc_free(spnego_state->sub_sec_security);
1012 nt_status = gensec_subcontext_start(spnego_state,
1013 gensec_security,
1014 &spnego_state->sub_sec_security);
1015 if (!NT_STATUS_IS_OK(nt_status)) {
1016 spnego_free_data(&spnego);
1017 return nt_status;
1018 }
1019 /* select the sub context */
1020 nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
1021 spnego.negTokenTarg.supportedMech);
1022 if (!NT_STATUS_IS_OK(nt_status)) {
1023 spnego_free_data(&spnego);
1024 return nt_status;
1025 }
1026
1027 nt_status = gensec_update(spnego_state->sub_sec_security,
1028 out_mem_ctx, ev,
1029 spnego.negTokenTarg.responseToken,
1030 &unwrapped_out);
1031 spnego_state->neg_oid = talloc_strdup(spnego_state, spnego.negTokenTarg.supportedMech);
1032 } else if (spnego_state->no_response_expected) {
1033 if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1034 DEBUG(3,("GENSEC SPNEGO: client GENSEC accepted, but server rejected (bad password?)\n"));
1035 nt_status = NT_STATUS_INVALID_PARAMETER;
1036 } else if (spnego.negTokenTarg.responseToken.length) {
1037 DEBUG(2,("GENSEC SPNEGO: client GENSEC accepted, but server continued negotiation!\n"));
1038 nt_status = NT_STATUS_INVALID_PARAMETER;
1039 } else {
1040 nt_status = NT_STATUS_OK;
1041 }
1042 if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
1043 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
1044 spnego_state->mech_types.data,
1045 spnego_state->mech_types.length,
1046 spnego_state->mech_types.data,
1047 spnego_state->mech_types.length,
1048 &spnego.negTokenTarg.mechListMIC);
1049 if (!NT_STATUS_IS_OK(nt_status)) {
1050 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
1051 nt_errstr(nt_status)));
1052 }
1053 }
1054 } else {
1055 bool new_spnego = false;
1056
1057 nt_status = gensec_update(spnego_state->sub_sec_security,
1058 out_mem_ctx, ev,
1059 spnego.negTokenTarg.responseToken,
1060 &unwrapped_out);
1061
1062 if (NT_STATUS_IS_OK(nt_status)
1063 && spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1064 new_spnego = gensec_have_feature(spnego_state->sub_sec_security,
1065 GENSEC_FEATURE_NEW_SPNEGO);
1066 }
1067 if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
1068 nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
1069 out_mem_ctx,
1070 spnego_state->mech_types.data,
1071 spnego_state->mech_types.length,
1072 spnego_state->mech_types.data,
1073 spnego_state->mech_types.length,
1074 &mech_list_mic);
1075 if (!NT_STATUS_IS_OK(nt_status)) {
1076 DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
1077 nt_errstr(nt_status)));
1078 }
1079 }
1080 if (NT_STATUS_IS_OK(nt_status)) {
1081 spnego_state->no_response_expected = true;
1082 }
1083 }
1084
1085 spnego_free_data(&spnego);
1086
1087 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
1088 && !NT_STATUS_IS_OK(nt_status)) {
1089 DEBUG(1, ("SPNEGO(%s) login failed: %s\n",
1090 spnego_state->sub_sec_security->ops->name,
1091 nt_errstr(nt_status)));
1092 return nt_status;
1093 }
1094
1095 if (unwrapped_out.length || mech_list_mic.length) {
1096 /* compose reply */
1097 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
1098 spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
1099 spnego_out.negTokenTarg.supportedMech = NULL;
1100 spnego_out.negTokenTarg.responseToken = unwrapped_out;
1101 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
1102
1103 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
1104 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
1105 return NT_STATUS_INVALID_PARAMETER;
1106 }
1107
1108 spnego_state->state_position = SPNEGO_CLIENT_TARG;
1109 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
1110 } else {
1111
1112 /* all done - server has accepted, and we agree */
1113 *out = null_data_blob;
1114
1115 if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1116 /* unless of course it did not accept */
1117 DEBUG(1,("gensec_update ok but not accepted\n"));
1118 nt_status = NT_STATUS_INVALID_PARAMETER;
1119 }
1120
1121 spnego_state->state_position = SPNEGO_DONE;
1122 }
1123
1124 return nt_status;
1125 }
1126 case SPNEGO_DONE:
1127 /* We should not be called after we are 'done' */
1128 return NT_STATUS_INVALID_PARAMETER;
1129 }
1130 return NT_STATUS_INVALID_PARAMETER;
1131 }
1132
1133 static void gensec_spnego_want_feature(struct gensec_security *gensec_security,
1134 uint32_t feature)
1135 {
1136 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1137
1138 if (!spnego_state || !spnego_state->sub_sec_security) {
1139 gensec_security->want_features |= feature;
1140 return;
1141 }
1142
1143 gensec_want_feature(spnego_state->sub_sec_security,
1144 feature);
1145 }
1146
1147 static bool gensec_spnego_have_feature(struct gensec_security *gensec_security,
1148 uint32_t feature)
1149 {
1150 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1151 if (!spnego_state->sub_sec_security) {
1152 return false;
1153 }
1154
1155 return gensec_have_feature(spnego_state->sub_sec_security,
1156 feature);
1157 }
1158
1159 static const char *gensec_spnego_oids[] = {
1160 GENSEC_OID_SPNEGO,
1161 NULL
1162 };
1163
1164 static const struct gensec_security_ops gensec_spnego_security_ops = {
1165 .name = "spnego",
1166 .sasl_name = "GSS-SPNEGO",
1167 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1168 .oid = gensec_spnego_oids,
1169 .client_start = gensec_spnego_client_start,
1170 .server_start = gensec_spnego_server_start,
1171 .update = gensec_spnego_update,
1172 .seal_packet = gensec_spnego_seal_packet,
1173 .sign_packet = gensec_spnego_sign_packet,
1174 .sig_size = gensec_spnego_sig_size,
1175 .max_wrapped_size = gensec_spnego_max_wrapped_size,
1176 .max_input_size = gensec_spnego_max_input_size,
1177 .check_packet = gensec_spnego_check_packet,
1178 .unseal_packet = gensec_spnego_unseal_packet,
1179 .packet_full_request = gensec_spnego_packet_full_request,
1180 .wrap = gensec_spnego_wrap,
1181 .unwrap = gensec_spnego_unwrap,
1182 .wrap_packets = gensec_spnego_wrap_packets,
1183 .unwrap_packets = gensec_spnego_unwrap_packets,
1184 .session_key = gensec_spnego_session_key,
1185 .session_info = gensec_spnego_session_info,
1186 .want_feature = gensec_spnego_want_feature,
1187 .have_feature = gensec_spnego_have_feature,
1188 .enabled = true,
1189 .priority = GENSEC_SPNEGO
1190 };
1191
1192 _PUBLIC_ NTSTATUS gensec_spnego_init(void)
1193 {
1194 NTSTATUS ret;
1195 ret = gensec_register(&gensec_spnego_security_ops);
1196 if (!NT_STATUS_IS_OK(ret)) {
1197 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1198 gensec_spnego_security_ops.name));
1199 return ret;
1200 }
1201
1202 return ret;
1203 }
reg import