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dns: The QCLASS is called IN, not IP
[Samba/gebeck_regimport.git] / source4 / auth / gensec / spnego.c
blob66204ee26217adfb8c82b149a440539d58cd08b8
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 TALLOC_CTX *out_mem_ctx,
335 const DATA_BLOB in, DATA_BLOB *out)
336 {
337 int i,j;
338 struct gensec_security_ops **all_ops
339 = gensec_security_mechs(gensec_security, out_mem_ctx);
340 for (i=0; all_ops[i]; i++) {
341 bool is_spnego;
342 NTSTATUS nt_status;
343
344 if (gensec_security != NULL &&
345 !gensec_security_ops_enabled(all_ops[i], gensec_security))
346 continue;
347
348 if (!all_ops[i]->oid) {
349 continue;
350 }
351
352 is_spnego = false;
353 for (j=0; all_ops[i]->oid[j]; j++) {
354 if (strcasecmp(GENSEC_OID_SPNEGO,all_ops[i]->oid[j]) == 0) {
355 is_spnego = true;
356 }
357 }
358 if (is_spnego) {
359 continue;
360 }
361
362 if (!all_ops[i]->magic) {
363 continue;
364 }
365
366 nt_status = all_ops[i]->magic(gensec_security, &in);
367 if (!NT_STATUS_IS_OK(nt_status)) {
368 continue;
369 }
370
371 spnego_state->state_position = SPNEGO_FALLBACK;
372
373 nt_status = gensec_subcontext_start(spnego_state,
374 gensec_security,
375 &spnego_state->sub_sec_security);
376
377 if (!NT_STATUS_IS_OK(nt_status)) {
378 return nt_status;
379 }
380 /* select the sub context */
381 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
382 all_ops[i]);
383 if (!NT_STATUS_IS_OK(nt_status)) {
384 return nt_status;
385 }
386 nt_status = gensec_update(spnego_state->sub_sec_security,
387 out_mem_ctx, in, out);
388 return nt_status;
389 }
390 DEBUG(1, ("Failed to parse SPNEGO request\n"));
391 return NT_STATUS_INVALID_PARAMETER;
392
393 }
394
395 /*
396 Parse the netTokenInit, either from the client, to the server, or
397 from the server to the client.
398 */
399
400 static NTSTATUS gensec_spnego_parse_negTokenInit(struct gensec_security *gensec_security,
401 struct spnego_state *spnego_state,
402 TALLOC_CTX *out_mem_ctx,
403 const char **mechType,
404 const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out)
405 {
406 int i;
407 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
408 DATA_BLOB null_data_blob = data_blob(NULL,0);
409 bool ok;
410
411 const struct gensec_security_ops_wrapper *all_sec
412 = gensec_security_by_oid_list(gensec_security,
413 out_mem_ctx,
414 mechType,
415 GENSEC_OID_SPNEGO);
416
417 ok = spnego_write_mech_types(spnego_state,
418 mechType,
419 &spnego_state->mech_types);
420 if (!ok) {
421 DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
422 return NT_STATUS_NO_MEMORY;
423 }
424
425 if (spnego_state->state_position == SPNEGO_SERVER_START) {
426 uint32_t j;
427 for (j=0; mechType && mechType[j]; j++) {
428 for (i=0; all_sec && all_sec[i].op; i++) {
429 nt_status = gensec_subcontext_start(spnego_state,
430 gensec_security,
431 &spnego_state->sub_sec_security);
432 if (!NT_STATUS_IS_OK(nt_status)) {
433 return nt_status;
434 }
435 /* select the sub context */
436 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
437 all_sec[i].op);
438 if (!NT_STATUS_IS_OK(nt_status)) {
439 talloc_free(spnego_state->sub_sec_security);
440 spnego_state->sub_sec_security = NULL;
441 break;
442 }
443
444 if (j > 0) {
445 /* no optimistic token */
446 spnego_state->neg_oid = all_sec[i].oid;
447 *unwrapped_out = data_blob_null;
448 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
449 break;
450 }
451
452 nt_status = gensec_update(spnego_state->sub_sec_security,
453 out_mem_ctx,
454 unwrapped_in,
455 unwrapped_out);
456 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
457 NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
458 /* Pretend we never started it (lets the first run find some incompatible demand) */
459
460 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse contents: %s\n",
461 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
462 talloc_free(spnego_state->sub_sec_security);
463 spnego_state->sub_sec_security = NULL;
464 break;
465 }
466
467 spnego_state->neg_oid = all_sec[i].oid;
468 break;
469 }
470 if (spnego_state->sub_sec_security) {
471 break;
472 }
473 }
474
475 if (!spnego_state->sub_sec_security) {
476 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
477 return NT_STATUS_INVALID_PARAMETER;
478 }
479 }
480
481 /* Having tried any optimistic token from the client (if we
482 * were the server), if we didn't get anywhere, walk our list
483 * in our preference order */
484
485 if (!spnego_state->sub_sec_security) {
486 for (i=0; all_sec && all_sec[i].op; i++) {
487 nt_status = gensec_subcontext_start(spnego_state,
488 gensec_security,
489 &spnego_state->sub_sec_security);
490 if (!NT_STATUS_IS_OK(nt_status)) {
491 return nt_status;
492 }
493 /* select the sub context */
494 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
495 all_sec[i].op);
496 if (!NT_STATUS_IS_OK(nt_status)) {
497 talloc_free(spnego_state->sub_sec_security);
498 spnego_state->sub_sec_security = NULL;
499 continue;
500 }
501
502 spnego_state->neg_oid = all_sec[i].oid;
503
504 /* only get the helping start blob for the first OID */
505 nt_status = gensec_update(spnego_state->sub_sec_security,
506 out_mem_ctx,
507 null_data_blob,
508 unwrapped_out);
509
510 /* it is likely that a NULL input token will
511 * not be liked by most server mechs, but if
512 * we are in the client, we want the first
513 * update packet to be able to abort the use
514 * of this mech */
515 if (spnego_state->state_position != SPNEGO_SERVER_START) {
516 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
517 NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_LOGON_SERVERS) ||
518 NT_STATUS_EQUAL(nt_status, NT_STATUS_TIME_DIFFERENCE_AT_DC) ||
519 NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
520 /* Pretend we never started it (lets the first run find some incompatible demand) */
521
522 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse: %s\n",
523 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
524 talloc_free(spnego_state->sub_sec_security);
525 spnego_state->sub_sec_security = NULL;
526 continue;
527 }
528 }
529
530 break;
531 }
532 }
533
534 if (spnego_state->sub_sec_security) {
535 /* it is likely that a NULL input token will
536 * not be liked by most server mechs, but this
537 * does the right thing in the CIFS client.
538 * just push us along the merry-go-round
539 * again, and hope for better luck next
540 * time */
541
542 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
543 *unwrapped_out = data_blob(NULL, 0);
544 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
545 }
546
547 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)
548 && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
549 && !NT_STATUS_IS_OK(nt_status)) {
550 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
551 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
552 talloc_free(spnego_state->sub_sec_security);
553 spnego_state->sub_sec_security = NULL;
554
555 /* We started the mech correctly, and the
556 * input from the other side was valid.
557 * Return the error (say bad password, invalid
558 * ticket) */
559 return nt_status;
560 }
561
562
563 return nt_status; /* OK, INVALID_PARAMETER ore MORE PROCESSING */
564 }
565
566 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
567 /* we could re-negotiate here, but it would only work
568 * if the client or server lied about what it could
569 * support the first time. Lets keep this code to
570 * reality */
571
572 return nt_status;
573 }
574
575 /** create a negTokenInit
576 *
577 * This is the same packet, no matter if the client or server sends it first, but it is always the first packet
578 */
579 static NTSTATUS gensec_spnego_create_negTokenInit(struct gensec_security *gensec_security,
580 struct spnego_state *spnego_state,
581 TALLOC_CTX *out_mem_ctx,
582 const DATA_BLOB in, DATA_BLOB *out)
583 {
584 int i;
585 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
586 DATA_BLOB null_data_blob = data_blob(NULL,0);
587 const char **mechTypes = NULL;
588 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
589 const struct gensec_security_ops_wrapper *all_sec;
590
591 mechTypes = gensec_security_oids(gensec_security,
592 out_mem_ctx, GENSEC_OID_SPNEGO);
593
594 all_sec = gensec_security_by_oid_list(gensec_security,
595 out_mem_ctx,
596 mechTypes,
597 GENSEC_OID_SPNEGO);
598 for (i=0; all_sec && all_sec[i].op; i++) {
599 struct spnego_data spnego_out;
600 const char **send_mech_types;
601 bool ok;
602
603 nt_status = gensec_subcontext_start(spnego_state,
604 gensec_security,
605 &spnego_state->sub_sec_security);
606 if (!NT_STATUS_IS_OK(nt_status)) {
607 return nt_status;
608 }
609 /* select the sub context */
610 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
611 all_sec[i].op);
612 if (!NT_STATUS_IS_OK(nt_status)) {
613 talloc_free(spnego_state->sub_sec_security);
614 spnego_state->sub_sec_security = NULL;
615 continue;
616 }
617
618 /* In the client, try and produce the first (optimistic) packet */
619 if (spnego_state->state_position == SPNEGO_CLIENT_START) {
620 nt_status = gensec_update(spnego_state->sub_sec_security,
621 out_mem_ctx,
622 null_data_blob,
623 &unwrapped_out);
624
625 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
626 && !NT_STATUS_IS_OK(nt_status)) {
627 DEBUG(1, ("SPNEGO(%s) creating NEG_TOKEN_INIT failed: %s\n",
628 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
629 talloc_free(spnego_state->sub_sec_security);
630 spnego_state->sub_sec_security = NULL;
631 /* Pretend we never started it (lets the first run find some incompatible demand) */
632
633 continue;
634 }
635 }
636
637 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
638
639 send_mech_types = gensec_security_oids_from_ops_wrapped(out_mem_ctx,
640 &all_sec[i]);
641
642 ok = spnego_write_mech_types(spnego_state,
643 send_mech_types,
644 &spnego_state->mech_types);
645 if (!ok) {
646 DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
647 return NT_STATUS_NO_MEMORY;
648 }
649
650 /* List the remaining mechs as options */
651 spnego_out.negTokenInit.mechTypes = send_mech_types;
652 spnego_out.negTokenInit.reqFlags = null_data_blob;
653 spnego_out.negTokenInit.reqFlagsPadding = 0;
654
655 if (spnego_state->state_position == SPNEGO_SERVER_START) {
656 spnego_out.negTokenInit.mechListMIC
657 = data_blob_string_const(ADS_IGNORE_PRINCIPAL);
658 } else {
659 spnego_out.negTokenInit.mechListMIC = null_data_blob;
660 }
661
662 spnego_out.negTokenInit.mechToken = unwrapped_out;
663
664 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
665 DEBUG(1, ("Failed to write NEG_TOKEN_INIT\n"));
666 return NT_STATUS_INVALID_PARAMETER;
667 }
668
669 /* set next state */
670 spnego_state->neg_oid = all_sec[i].oid;
671
672 if (NT_STATUS_IS_OK(nt_status)) {
673 spnego_state->no_response_expected = true;
674 }
675
676 return NT_STATUS_MORE_PROCESSING_REQUIRED;
677 }
678 talloc_free(spnego_state->sub_sec_security);
679 spnego_state->sub_sec_security = NULL;
680
681 DEBUG(1, ("Failed to setup SPNEGO negTokenInit request: %s\n", nt_errstr(nt_status)));
682 return NT_STATUS_INVALID_PARAMETER;
683 }
684
685
686 /** create a server negTokenTarg
687 *
688 * This is the case, where the client is the first one who sends data
689 */
690
691 static NTSTATUS gensec_spnego_server_negTokenTarg(struct gensec_security *gensec_security,
692 struct spnego_state *spnego_state,
693 TALLOC_CTX *out_mem_ctx,
694 NTSTATUS nt_status,
695 const DATA_BLOB unwrapped_out,
696 DATA_BLOB mech_list_mic,
697 DATA_BLOB *out)
698 {
699 struct spnego_data spnego_out;
700 DATA_BLOB null_data_blob = data_blob(NULL, 0);
701
702 /* compose reply */
703 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
704 spnego_out.negTokenTarg.responseToken = unwrapped_out;
705 spnego_out.negTokenTarg.mechListMIC = null_data_blob;
706 spnego_out.negTokenTarg.supportedMech = NULL;
707
708 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
709 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
710 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
711 spnego_state->state_position = SPNEGO_SERVER_TARG;
712 } else if (NT_STATUS_IS_OK(nt_status)) {
713 if (unwrapped_out.data) {
714 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
715 }
716 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
717 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
718 spnego_state->state_position = SPNEGO_DONE;
719 } else {
720 spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
721 DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
722 spnego_state->state_position = SPNEGO_DONE;
723 }
724
725 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
726 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
727 return NT_STATUS_INVALID_PARAMETER;
728 }
729
730 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
731
732 return nt_status;
733 }
734
735
736 static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
737 const DATA_BLOB in, DATA_BLOB *out)
738 {
739 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
740 DATA_BLOB null_data_blob = data_blob(NULL, 0);
741 DATA_BLOB mech_list_mic = data_blob(NULL, 0);
742 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
743 struct spnego_data spnego_out;
744 struct spnego_data spnego;
745
746 ssize_t len;
747
748 *out = data_blob(NULL, 0);
749
750 if (!out_mem_ctx) {
751 out_mem_ctx = spnego_state;
752 }
753
754 /* and switch into the state machine */
755
756 switch (spnego_state->state_position) {
757 case SPNEGO_FALLBACK:
758 return gensec_update(spnego_state->sub_sec_security,
759 out_mem_ctx, in, out);
760 case SPNEGO_SERVER_START:
761 {
762 NTSTATUS nt_status;
763 if (in.length) {
764
765 len = spnego_read_data(gensec_security, in, &spnego);
766 if (len == -1) {
767 return gensec_spnego_server_try_fallback(gensec_security, spnego_state,
768 out_mem_ctx, in, out);
769 }
770 /* client sent NegTargetInit, we send NegTokenTarg */
771
772 /* OK, so it's real SPNEGO, check the packet's the one we expect */
773 if (spnego.type != spnego_state->expected_packet) {
774 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
775 spnego_state->expected_packet));
776 dump_data(1, in.data, in.length);
777 spnego_free_data(&spnego);
778 return NT_STATUS_INVALID_PARAMETER;
779 }
780
781 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
782 spnego_state,
783 out_mem_ctx,
784 spnego.negTokenInit.mechTypes,
785 spnego.negTokenInit.mechToken,
786 &unwrapped_out);
787
788 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
789 spnego_state,
790 out_mem_ctx,
791 nt_status,
792 unwrapped_out,
793 null_data_blob,
794 out);
795
796 spnego_free_data(&spnego);
797
798 return nt_status;
799 } else {
800 nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
801 out_mem_ctx, in, out);
802 spnego_state->state_position = SPNEGO_SERVER_START;
803 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
804 return nt_status;
805 }
806 }
807
808 case SPNEGO_CLIENT_START:
809 {
810 /* The server offers a list of mechanisms */
811
812 const char *my_mechs[] = {NULL, NULL};
813 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
814
815 if (!in.length) {
816 /* client to produce negTokenInit */
817 nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
818 out_mem_ctx, in, out);
819 spnego_state->state_position = SPNEGO_CLIENT_TARG;
820 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
821 return nt_status;
822 }
823
824 len = spnego_read_data(gensec_security, in, &spnego);
825
826 if (len == -1) {
827 DEBUG(1, ("Invalid SPNEGO request:\n"));
828 dump_data(1, in.data, in.length);
829 return NT_STATUS_INVALID_PARAMETER;
830 }
831
832 /* OK, so it's real SPNEGO, check the packet's the one we expect */
833 if (spnego.type != spnego_state->expected_packet) {
834 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
835 spnego_state->expected_packet));
836 dump_data(1, in.data, in.length);
837 spnego_free_data(&spnego);
838 return NT_STATUS_INVALID_PARAMETER;
839 }
840
841 if (spnego.negTokenInit.targetPrincipal
842 && strcmp(spnego.negTokenInit.targetPrincipal, ADS_IGNORE_PRINCIPAL) != 0) {
843 DEBUG(5, ("Server claims it's principal name is %s\n", spnego.negTokenInit.targetPrincipal));
844 if (lpcfg_client_use_spnego_principal(gensec_security->settings->lp_ctx)) {
845 gensec_set_target_principal(gensec_security, spnego.negTokenInit.targetPrincipal);
846 }
847 }
848
849 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
850 spnego_state,
851 out_mem_ctx,
852 spnego.negTokenInit.mechTypes,
853 spnego.negTokenInit.mechToken,
854 &unwrapped_out);
855
856 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
857 spnego_free_data(&spnego);
858 return nt_status;
859 }
860
861 my_mechs[0] = spnego_state->neg_oid;
862 /* compose reply */
863 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
864 spnego_out.negTokenInit.mechTypes = my_mechs;
865 spnego_out.negTokenInit.reqFlags = null_data_blob;
866 spnego_out.negTokenInit.reqFlagsPadding = 0;
867 spnego_out.negTokenInit.mechListMIC = null_data_blob;
868 spnego_out.negTokenInit.mechToken = unwrapped_out;
869
870 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
871 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
872 return NT_STATUS_INVALID_PARAMETER;
873 }
874
875 /* set next state */
876 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
877 spnego_state->state_position = SPNEGO_CLIENT_TARG;
878
879 if (NT_STATUS_IS_OK(nt_status)) {
880 spnego_state->no_response_expected = true;
881 }
882
883 spnego_free_data(&spnego);
884 return NT_STATUS_MORE_PROCESSING_REQUIRED;
885 }
886 case SPNEGO_SERVER_TARG:
887 {
888 NTSTATUS nt_status;
889 bool new_spnego = false;
890
891 if (!in.length) {
892 return NT_STATUS_INVALID_PARAMETER;
893 }
894
895 len = spnego_read_data(gensec_security, in, &spnego);
896
897 if (len == -1) {
898 DEBUG(1, ("Invalid SPNEGO request:\n"));
899 dump_data(1, in.data, in.length);
900 return NT_STATUS_INVALID_PARAMETER;
901 }
902
903 /* OK, so it's real SPNEGO, check the packet's the one we expect */
904 if (spnego.type != spnego_state->expected_packet) {
905 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
906 spnego_state->expected_packet));
907 dump_data(1, in.data, in.length);
908 spnego_free_data(&spnego);
909 return NT_STATUS_INVALID_PARAMETER;
910 }
911
912 if (!spnego_state->sub_sec_security) {
913 DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
914 spnego_free_data(&spnego);
915 return NT_STATUS_INVALID_PARAMETER;
916 }
917
918 nt_status = gensec_update(spnego_state->sub_sec_security,
919 out_mem_ctx,
920 spnego.negTokenTarg.responseToken,
921 &unwrapped_out);
922 if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
923 new_spnego = true;
924 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
925 spnego_state->mech_types.data,
926 spnego_state->mech_types.length,
927 spnego_state->mech_types.data,
928 spnego_state->mech_types.length,
929 &spnego.negTokenTarg.mechListMIC);
930 if (!NT_STATUS_IS_OK(nt_status)) {
931 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
932 nt_errstr(nt_status)));
933 }
934 }
935 if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
936 nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
937 out_mem_ctx,
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 &mech_list_mic);
943 if (!NT_STATUS_IS_OK(nt_status)) {
944 DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
945 nt_errstr(nt_status)));
946 }
947 }
948
949 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
950 spnego_state,
951 out_mem_ctx,
952 nt_status,
953 unwrapped_out,
954 mech_list_mic,
955 out);
956
957 spnego_free_data(&spnego);
958
959 return nt_status;
960 }
961 case SPNEGO_CLIENT_TARG:
962 {
963 NTSTATUS nt_status;
964 if (!in.length) {
965 return NT_STATUS_INVALID_PARAMETER;
966 }
967
968 len = spnego_read_data(gensec_security, in, &spnego);
969
970 if (len == -1) {
971 DEBUG(1, ("Invalid SPNEGO request:\n"));
972 dump_data(1, in.data, in.length);
973 return NT_STATUS_INVALID_PARAMETER;
974 }
975
976 /* OK, so it's real SPNEGO, check the packet's the one we expect */
977 if (spnego.type != spnego_state->expected_packet) {
978 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
979 spnego_state->expected_packet));
980 dump_data(1, in.data, in.length);
981 spnego_free_data(&spnego);
982 return NT_STATUS_INVALID_PARAMETER;
983 }
984
985 if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
986 spnego_free_data(&spnego);
987 return NT_STATUS_ACCESS_DENIED;
988 }
989
990 /* Server didn't like our choice of mech, and chose something else */
991 if ((spnego.negTokenTarg.negResult == SPNEGO_ACCEPT_INCOMPLETE) &&
992 spnego.negTokenTarg.supportedMech &&
993 strcmp(spnego.negTokenTarg.supportedMech, spnego_state->neg_oid) != 0) {
994 DEBUG(3,("GENSEC SPNEGO: client preferred mech (%s) not accepted, server wants: %s\n",
995 gensec_get_name_by_oid(gensec_security, spnego.negTokenTarg.supportedMech),
996 gensec_get_name_by_oid(gensec_security, spnego_state->neg_oid)));
997
998 talloc_free(spnego_state->sub_sec_security);
999 nt_status = gensec_subcontext_start(spnego_state,
1000 gensec_security,
1001 &spnego_state->sub_sec_security);
1002 if (!NT_STATUS_IS_OK(nt_status)) {
1003 spnego_free_data(&spnego);
1004 return nt_status;
1005 }
1006 /* select the sub context */
1007 nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
1008 spnego.negTokenTarg.supportedMech);
1009 if (!NT_STATUS_IS_OK(nt_status)) {
1010 spnego_free_data(&spnego);
1011 return nt_status;
1012 }
1013
1014 nt_status = gensec_update(spnego_state->sub_sec_security,
1015 out_mem_ctx,
1016 spnego.negTokenTarg.responseToken,
1017 &unwrapped_out);
1018 spnego_state->neg_oid = talloc_strdup(spnego_state, spnego.negTokenTarg.supportedMech);
1019 } else if (spnego_state->no_response_expected) {
1020 if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1021 DEBUG(3,("GENSEC SPNEGO: client GENSEC accepted, but server rejected (bad password?)\n"));
1022 nt_status = NT_STATUS_INVALID_PARAMETER;
1023 } else if (spnego.negTokenTarg.responseToken.length) {
1024 DEBUG(2,("GENSEC SPNEGO: client GENSEC accepted, but server continued negotiation!\n"));
1025 nt_status = NT_STATUS_INVALID_PARAMETER;
1026 } else {
1027 nt_status = NT_STATUS_OK;
1028 }
1029 if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
1030 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
1031 spnego_state->mech_types.data,
1032 spnego_state->mech_types.length,
1033 spnego_state->mech_types.data,
1034 spnego_state->mech_types.length,
1035 &spnego.negTokenTarg.mechListMIC);
1036 if (!NT_STATUS_IS_OK(nt_status)) {
1037 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
1038 nt_errstr(nt_status)));
1039 }
1040 }
1041 } else {
1042 bool new_spnego = false;
1043
1044 nt_status = gensec_update(spnego_state->sub_sec_security,
1045 out_mem_ctx,
1046 spnego.negTokenTarg.responseToken,
1047 &unwrapped_out);
1048
1049 if (NT_STATUS_IS_OK(nt_status)
1050 && spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1051 new_spnego = gensec_have_feature(spnego_state->sub_sec_security,
1052 GENSEC_FEATURE_NEW_SPNEGO);
1053 }
1054 if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
1055 nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
1056 out_mem_ctx,
1057 spnego_state->mech_types.data,
1058 spnego_state->mech_types.length,
1059 spnego_state->mech_types.data,
1060 spnego_state->mech_types.length,
1061 &mech_list_mic);
1062 if (!NT_STATUS_IS_OK(nt_status)) {
1063 DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
1064 nt_errstr(nt_status)));
1065 }
1066 }
1067 if (NT_STATUS_IS_OK(nt_status)) {
1068 spnego_state->no_response_expected = true;
1069 }
1070 }
1071
1072 spnego_free_data(&spnego);
1073
1074 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
1075 && !NT_STATUS_IS_OK(nt_status)) {
1076 DEBUG(1, ("SPNEGO(%s) login failed: %s\n",
1077 spnego_state->sub_sec_security->ops->name,
1078 nt_errstr(nt_status)));
1079 return nt_status;
1080 }
1081
1082 if (unwrapped_out.length || mech_list_mic.length) {
1083 /* compose reply */
1084 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
1085 spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
1086 spnego_out.negTokenTarg.supportedMech = NULL;
1087 spnego_out.negTokenTarg.responseToken = unwrapped_out;
1088 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
1089
1090 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
1091 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
1092 return NT_STATUS_INVALID_PARAMETER;
1093 }
1094
1095 spnego_state->state_position = SPNEGO_CLIENT_TARG;
1096 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
1097 } else {
1098
1099 /* all done - server has accepted, and we agree */
1100 *out = null_data_blob;
1101
1102 if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1103 /* unless of course it did not accept */
1104 DEBUG(1,("gensec_update ok but not accepted\n"));
1105 nt_status = NT_STATUS_INVALID_PARAMETER;
1106 }
1107
1108 spnego_state->state_position = SPNEGO_DONE;
1109 }
1110
1111 return nt_status;
1112 }
1113 case SPNEGO_DONE:
1114 /* We should not be called after we are 'done' */
1115 return NT_STATUS_INVALID_PARAMETER;
1116 }
1117 return NT_STATUS_INVALID_PARAMETER;
1118 }
1119
1120 static void gensec_spnego_want_feature(struct gensec_security *gensec_security,
1121 uint32_t feature)
1122 {
1123 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1124
1125 if (!spnego_state || !spnego_state->sub_sec_security) {
1126 gensec_security->want_features |= feature;
1127 return;
1128 }
1129
1130 gensec_want_feature(spnego_state->sub_sec_security,
1131 feature);
1132 }
1133
1134 static bool gensec_spnego_have_feature(struct gensec_security *gensec_security,
1135 uint32_t feature)
1136 {
1137 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1138 if (!spnego_state->sub_sec_security) {
1139 return false;
1140 }
1141
1142 return gensec_have_feature(spnego_state->sub_sec_security,
1143 feature);
1144 }
1145
1146 static const char *gensec_spnego_oids[] = {
1147 GENSEC_OID_SPNEGO,
1148 NULL
1149 };
1150
1151 static const struct gensec_security_ops gensec_spnego_security_ops = {
1152 .name = "spnego",
1153 .sasl_name = "GSS-SPNEGO",
1154 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1155 .oid = gensec_spnego_oids,
1156 .client_start = gensec_spnego_client_start,
1157 .server_start = gensec_spnego_server_start,
1158 .update = gensec_spnego_update,
1159 .seal_packet = gensec_spnego_seal_packet,
1160 .sign_packet = gensec_spnego_sign_packet,
1161 .sig_size = gensec_spnego_sig_size,
1162 .max_wrapped_size = gensec_spnego_max_wrapped_size,
1163 .max_input_size = gensec_spnego_max_input_size,
1164 .check_packet = gensec_spnego_check_packet,
1165 .unseal_packet = gensec_spnego_unseal_packet,
1166 .packet_full_request = gensec_spnego_packet_full_request,
1167 .wrap = gensec_spnego_wrap,
1168 .unwrap = gensec_spnego_unwrap,
1169 .wrap_packets = gensec_spnego_wrap_packets,
1170 .unwrap_packets = gensec_spnego_unwrap_packets,
1171 .session_key = gensec_spnego_session_key,
1172 .session_info = gensec_spnego_session_info,
1173 .want_feature = gensec_spnego_want_feature,
1174 .have_feature = gensec_spnego_have_feature,
1175 .enabled = true,
1176 .priority = GENSEC_SPNEGO
1177 };
1178
1179 _PUBLIC_ NTSTATUS gensec_spnego_init(void)
1180 {
1181 NTSTATUS ret;
1182 ret = gensec_register(&gensec_spnego_security_ops);
1183 if (!NT_STATUS_IS_OK(ret)) {
1184 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1185 gensec_spnego_security_ops.name));
1186 return ret;
1187 }
1188
1189 return ret;
1190 }
reg import