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Third part of fix for bug #8541 - readlink() on Linux clients fails if the symlink...
[Samba.git] / source4 / auth / gensec / spnego.c
blob99687c71eb767d570c7b39d6b7aa88b605c43b3b
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 "param/param.h"
32
33 enum spnego_state_position {
34 SPNEGO_SERVER_START,
35 SPNEGO_CLIENT_START,
36 SPNEGO_SERVER_TARG,
37 SPNEGO_CLIENT_TARG,
38 SPNEGO_FALLBACK,
39 SPNEGO_DONE
40 };
41
42 struct spnego_state {
43 enum spnego_message_type expected_packet;
44 enum spnego_state_position state_position;
45 struct gensec_security *sub_sec_security;
46 bool no_response_expected;
47
48 const char *neg_oid;
49
50 DATA_BLOB mech_types;
51 };
52
53
54 static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_security)
55 {
56 struct spnego_state *spnego_state;
57
58 spnego_state = talloc(gensec_security, struct spnego_state);
59 if (!spnego_state) {
60 return NT_STATUS_NO_MEMORY;
61 }
62
63 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
64 spnego_state->state_position = SPNEGO_CLIENT_START;
65 spnego_state->sub_sec_security = NULL;
66 spnego_state->no_response_expected = false;
67 spnego_state->mech_types = data_blob(NULL, 0);
68
69 gensec_security->private_data = spnego_state;
70 return NT_STATUS_OK;
71 }
72
73 static NTSTATUS gensec_spnego_server_start(struct gensec_security *gensec_security)
74 {
75 struct spnego_state *spnego_state;
76
77 spnego_state = talloc(gensec_security, struct spnego_state);
78 if (!spnego_state) {
79 return NT_STATUS_NO_MEMORY;
80 }
81
82 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
83 spnego_state->state_position = SPNEGO_SERVER_START;
84 spnego_state->sub_sec_security = NULL;
85 spnego_state->no_response_expected = false;
86 spnego_state->mech_types = data_blob(NULL, 0);
87
88 gensec_security->private_data = spnego_state;
89 return NT_STATUS_OK;
90 }
91
92 /*
93 wrappers for the spnego_*() functions
94 */
95 static NTSTATUS gensec_spnego_unseal_packet(struct gensec_security *gensec_security,
96 TALLOC_CTX *mem_ctx,
97 uint8_t *data, size_t length,
98 const uint8_t *whole_pdu, size_t pdu_length,
99 const DATA_BLOB *sig)
100 {
101 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
102
103 if (spnego_state->state_position != SPNEGO_DONE
104 && spnego_state->state_position != SPNEGO_FALLBACK) {
105 return NT_STATUS_INVALID_PARAMETER;
106 }
107
108 return gensec_unseal_packet(spnego_state->sub_sec_security,
109 mem_ctx,
110 data, length,
111 whole_pdu, pdu_length,
112 sig);
113 }
114
115 static NTSTATUS gensec_spnego_check_packet(struct gensec_security *gensec_security,
116 TALLOC_CTX *mem_ctx,
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 mem_ctx,
130 data, length,
131 whole_pdu, pdu_length,
132 sig);
133 }
134
135 static NTSTATUS gensec_spnego_seal_packet(struct gensec_security *gensec_security,
136 TALLOC_CTX *mem_ctx,
137 uint8_t *data, size_t length,
138 const uint8_t *whole_pdu, size_t pdu_length,
139 DATA_BLOB *sig)
140 {
141 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
142
143 if (spnego_state->state_position != SPNEGO_DONE
144 && spnego_state->state_position != SPNEGO_FALLBACK) {
145 return NT_STATUS_INVALID_PARAMETER;
146 }
147
148 return gensec_seal_packet(spnego_state->sub_sec_security,
149 mem_ctx,
150 data, length,
151 whole_pdu, pdu_length,
152 sig);
153 }
154
155 static NTSTATUS gensec_spnego_sign_packet(struct gensec_security *gensec_security,
156 TALLOC_CTX *mem_ctx,
157 const uint8_t *data, size_t length,
158 const uint8_t *whole_pdu, size_t pdu_length,
159 DATA_BLOB *sig)
160 {
161 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
162
163 if (spnego_state->state_position != SPNEGO_DONE
164 && spnego_state->state_position != SPNEGO_FALLBACK) {
165 return NT_STATUS_INVALID_PARAMETER;
166 }
167
168 return gensec_sign_packet(spnego_state->sub_sec_security,
169 mem_ctx,
170 data, length,
171 whole_pdu, pdu_length,
172 sig);
173 }
174
175 static NTSTATUS gensec_spnego_wrap(struct gensec_security *gensec_security,
176 TALLOC_CTX *mem_ctx,
177 const DATA_BLOB *in,
178 DATA_BLOB *out)
179 {
180 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
181
182 if (spnego_state->state_position != SPNEGO_DONE
183 && spnego_state->state_position != SPNEGO_FALLBACK) {
184 DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
185 return NT_STATUS_INVALID_PARAMETER;
186 }
187
188 return gensec_wrap(spnego_state->sub_sec_security,
189 mem_ctx, in, out);
190 }
191
192 static NTSTATUS gensec_spnego_unwrap(struct gensec_security *gensec_security,
193 TALLOC_CTX *mem_ctx,
194 const DATA_BLOB *in,
195 DATA_BLOB *out)
196 {
197 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
198
199 if (spnego_state->state_position != SPNEGO_DONE
200 && spnego_state->state_position != SPNEGO_FALLBACK) {
201 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
202 return NT_STATUS_INVALID_PARAMETER;
203 }
204
205 return gensec_unwrap(spnego_state->sub_sec_security,
206 mem_ctx, in, out);
207 }
208
209 static NTSTATUS gensec_spnego_wrap_packets(struct gensec_security *gensec_security,
210 TALLOC_CTX *mem_ctx,
211 const DATA_BLOB *in,
212 DATA_BLOB *out,
213 size_t *len_processed)
214 {
215 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
216
217 if (spnego_state->state_position != SPNEGO_DONE
218 && spnego_state->state_position != SPNEGO_FALLBACK) {
219 DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
220 return NT_STATUS_INVALID_PARAMETER;
221 }
222
223 return gensec_wrap_packets(spnego_state->sub_sec_security,
224 mem_ctx, in, out,
225 len_processed);
226 }
227
228 static NTSTATUS gensec_spnego_packet_full_request(struct gensec_security *gensec_security,
229 DATA_BLOB blob, size_t *size)
230 {
231 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
232
233 if (spnego_state->state_position != SPNEGO_DONE
234 && spnego_state->state_position != SPNEGO_FALLBACK) {
235 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
236 return NT_STATUS_INVALID_PARAMETER;
237 }
238
239 return gensec_packet_full_request(spnego_state->sub_sec_security,
240 blob, size);
241 }
242
243 static NTSTATUS gensec_spnego_unwrap_packets(struct gensec_security *gensec_security,
244 TALLOC_CTX *mem_ctx,
245 const DATA_BLOB *in,
246 DATA_BLOB *out,
247 size_t *len_processed)
248 {
249 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
250
251 if (spnego_state->state_position != SPNEGO_DONE
252 && spnego_state->state_position != SPNEGO_FALLBACK) {
253 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
254 return NT_STATUS_INVALID_PARAMETER;
255 }
256
257 return gensec_unwrap_packets(spnego_state->sub_sec_security,
258 mem_ctx, in, out,
259 len_processed);
260 }
261
262 static size_t gensec_spnego_sig_size(struct gensec_security *gensec_security, size_t data_size)
263 {
264 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
265
266 if (spnego_state->state_position != SPNEGO_DONE
267 && spnego_state->state_position != SPNEGO_FALLBACK) {
268 return 0;
269 }
270
271 return gensec_sig_size(spnego_state->sub_sec_security, data_size);
272 }
273
274 static size_t gensec_spnego_max_input_size(struct gensec_security *gensec_security)
275 {
276 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
277
278 if (spnego_state->state_position != SPNEGO_DONE
279 && spnego_state->state_position != SPNEGO_FALLBACK) {
280 return 0;
281 }
282
283 return gensec_max_input_size(spnego_state->sub_sec_security);
284 }
285
286 static size_t gensec_spnego_max_wrapped_size(struct gensec_security *gensec_security)
287 {
288 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
289
290 if (spnego_state->state_position != SPNEGO_DONE
291 && spnego_state->state_position != SPNEGO_FALLBACK) {
292 return 0;
293 }
294
295 return gensec_max_wrapped_size(spnego_state->sub_sec_security);
296 }
297
298 static NTSTATUS gensec_spnego_session_key(struct gensec_security *gensec_security,
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 session_key);
308 }
309
310 static NTSTATUS gensec_spnego_session_info(struct gensec_security *gensec_security,
311 struct auth_session_info **session_info)
312 {
313 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
314 if (!spnego_state->sub_sec_security) {
315 return NT_STATUS_INVALID_PARAMETER;
316 }
317
318 return gensec_session_info(spnego_state->sub_sec_security,
319 session_info);
320 }
321
322 /** Fallback to another GENSEC mechanism, based on magic strings
323 *
324 * This is the 'fallback' case, where we don't get SPNEGO, and have to
325 * try all the other options (and hope they all have a magic string
326 * they check)
327 */
328
329 static NTSTATUS gensec_spnego_server_try_fallback(struct gensec_security *gensec_security,
330 struct spnego_state *spnego_state,
331 TALLOC_CTX *out_mem_ctx,
332 const DATA_BLOB in, DATA_BLOB *out)
333 {
334 int i,j;
335 struct gensec_security_ops **all_ops
336 = gensec_security_mechs(gensec_security, out_mem_ctx);
337 for (i=0; all_ops[i]; i++) {
338 bool is_spnego;
339 NTSTATUS nt_status;
340
341 if (gensec_security != NULL &&
342 !gensec_security_ops_enabled(all_ops[i], gensec_security))
343 continue;
344
345 if (!all_ops[i]->oid) {
346 continue;
347 }
348
349 is_spnego = false;
350 for (j=0; all_ops[i]->oid[j]; j++) {
351 if (strcasecmp(GENSEC_OID_SPNEGO,all_ops[i]->oid[j]) == 0) {
352 is_spnego = true;
353 }
354 }
355 if (is_spnego) {
356 continue;
357 }
358
359 if (!all_ops[i]->magic) {
360 continue;
361 }
362
363 nt_status = all_ops[i]->magic(gensec_security, &in);
364 if (!NT_STATUS_IS_OK(nt_status)) {
365 continue;
366 }
367
368 spnego_state->state_position = SPNEGO_FALLBACK;
369
370 nt_status = gensec_subcontext_start(spnego_state,
371 gensec_security,
372 &spnego_state->sub_sec_security);
373
374 if (!NT_STATUS_IS_OK(nt_status)) {
375 return nt_status;
376 }
377 /* select the sub context */
378 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
379 all_ops[i]);
380 if (!NT_STATUS_IS_OK(nt_status)) {
381 return nt_status;
382 }
383 nt_status = gensec_update(spnego_state->sub_sec_security,
384 out_mem_ctx, in, out);
385 return nt_status;
386 }
387 DEBUG(1, ("Failed to parse SPNEGO request\n"));
388 return NT_STATUS_INVALID_PARAMETER;
389
390 }
391
392 /*
393 Parse the netTokenInit, either from the client, to the server, or
394 from the server to the client.
395 */
396
397 static NTSTATUS gensec_spnego_parse_negTokenInit(struct gensec_security *gensec_security,
398 struct spnego_state *spnego_state,
399 TALLOC_CTX *out_mem_ctx,
400 const char **mechType,
401 const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out)
402 {
403 int i;
404 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
405 DATA_BLOB null_data_blob = data_blob(NULL,0);
406 bool ok;
407
408 const struct gensec_security_ops_wrapper *all_sec
409 = gensec_security_by_oid_list(gensec_security,
410 out_mem_ctx,
411 mechType,
412 GENSEC_OID_SPNEGO);
413
414 ok = spnego_write_mech_types(spnego_state,
415 mechType,
416 &spnego_state->mech_types);
417 if (!ok) {
418 DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
419 return NT_STATUS_NO_MEMORY;
420 }
421
422 if (spnego_state->state_position == SPNEGO_SERVER_START) {
423 uint32_t j;
424 for (j=0; mechType && mechType[j]; j++) {
425 for (i=0; all_sec && all_sec[i].op; i++) {
426 nt_status = gensec_subcontext_start(spnego_state,
427 gensec_security,
428 &spnego_state->sub_sec_security);
429 if (!NT_STATUS_IS_OK(nt_status)) {
430 return nt_status;
431 }
432 /* select the sub context */
433 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
434 all_sec[i].op);
435 if (!NT_STATUS_IS_OK(nt_status)) {
436 talloc_free(spnego_state->sub_sec_security);
437 spnego_state->sub_sec_security = NULL;
438 break;
439 }
440
441 if (j > 0) {
442 /* no optimistic token */
443 spnego_state->neg_oid = all_sec[i].oid;
444 *unwrapped_out = data_blob_null;
445 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
446 break;
447 }
448
449 nt_status = gensec_update(spnego_state->sub_sec_security,
450 out_mem_ctx,
451 unwrapped_in,
452 unwrapped_out);
453 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
454 NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
455 /* Pretend we never started it (lets the first run find some incompatible demand) */
456
457 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse contents: %s\n",
458 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
459 talloc_free(spnego_state->sub_sec_security);
460 spnego_state->sub_sec_security = NULL;
461 break;
462 }
463
464 spnego_state->neg_oid = all_sec[i].oid;
465 break;
466 }
467 if (spnego_state->sub_sec_security) {
468 break;
469 }
470 }
471
472 if (!spnego_state->sub_sec_security) {
473 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
474 return NT_STATUS_INVALID_PARAMETER;
475 }
476 }
477
478 /* Having tried any optimistic token from the client (if we
479 * were the server), if we didn't get anywhere, walk our list
480 * in our preference order */
481
482 if (!spnego_state->sub_sec_security) {
483 for (i=0; all_sec && all_sec[i].op; i++) {
484 nt_status = gensec_subcontext_start(spnego_state,
485 gensec_security,
486 &spnego_state->sub_sec_security);
487 if (!NT_STATUS_IS_OK(nt_status)) {
488 return nt_status;
489 }
490 /* select the sub context */
491 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
492 all_sec[i].op);
493 if (!NT_STATUS_IS_OK(nt_status)) {
494 talloc_free(spnego_state->sub_sec_security);
495 spnego_state->sub_sec_security = NULL;
496 continue;
497 }
498
499 spnego_state->neg_oid = all_sec[i].oid;
500
501 /* only get the helping start blob for the first OID */
502 nt_status = gensec_update(spnego_state->sub_sec_security,
503 out_mem_ctx,
504 null_data_blob,
505 unwrapped_out);
506
507 /* it is likely that a NULL input token will
508 * not be liked by most server mechs, but if
509 * we are in the client, we want the first
510 * update packet to be able to abort the use
511 * of this mech */
512 if (spnego_state->state_position != SPNEGO_SERVER_START) {
513 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
514 NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_LOGON_SERVERS) ||
515 NT_STATUS_EQUAL(nt_status, NT_STATUS_TIME_DIFFERENCE_AT_DC) ||
516 NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
517 /* Pretend we never started it (lets the first run find some incompatible demand) */
518
519 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse: %s\n",
520 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
521 talloc_free(spnego_state->sub_sec_security);
522 spnego_state->sub_sec_security = NULL;
523 continue;
524 }
525 }
526
527 break;
528 }
529 }
530
531 if (spnego_state->sub_sec_security) {
532 /* it is likely that a NULL input token will
533 * not be liked by most server mechs, but this
534 * does the right thing in the CIFS client.
535 * just push us along the merry-go-round
536 * again, and hope for better luck next
537 * time */
538
539 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
540 *unwrapped_out = data_blob(NULL, 0);
541 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
542 }
543
544 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)
545 && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
546 && !NT_STATUS_IS_OK(nt_status)) {
547 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
548 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
549 talloc_free(spnego_state->sub_sec_security);
550 spnego_state->sub_sec_security = NULL;
551
552 /* We started the mech correctly, and the
553 * input from the other side was valid.
554 * Return the error (say bad password, invalid
555 * ticket) */
556 return nt_status;
557 }
558
559
560 return nt_status; /* OK, INVALID_PARAMETER ore MORE PROCESSING */
561 }
562
563 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
564 /* we could re-negotiate here, but it would only work
565 * if the client or server lied about what it could
566 * support the first time. Lets keep this code to
567 * reality */
568
569 return nt_status;
570 }
571
572 /** create a negTokenInit
573 *
574 * This is the same packet, no matter if the client or server sends it first, but it is always the first packet
575 */
576 static NTSTATUS gensec_spnego_create_negTokenInit(struct gensec_security *gensec_security,
577 struct spnego_state *spnego_state,
578 TALLOC_CTX *out_mem_ctx,
579 const DATA_BLOB in, DATA_BLOB *out)
580 {
581 int i;
582 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
583 DATA_BLOB null_data_blob = data_blob(NULL,0);
584 const char **mechTypes = NULL;
585 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
586 const struct gensec_security_ops_wrapper *all_sec;
587
588 mechTypes = gensec_security_oids(gensec_security,
589 out_mem_ctx, GENSEC_OID_SPNEGO);
590
591 all_sec = gensec_security_by_oid_list(gensec_security,
592 out_mem_ctx,
593 mechTypes,
594 GENSEC_OID_SPNEGO);
595 for (i=0; all_sec && all_sec[i].op; i++) {
596 struct spnego_data spnego_out;
597 const char **send_mech_types;
598 bool ok;
599
600 nt_status = gensec_subcontext_start(spnego_state,
601 gensec_security,
602 &spnego_state->sub_sec_security);
603 if (!NT_STATUS_IS_OK(nt_status)) {
604 return nt_status;
605 }
606 /* select the sub context */
607 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
608 all_sec[i].op);
609 if (!NT_STATUS_IS_OK(nt_status)) {
610 talloc_free(spnego_state->sub_sec_security);
611 spnego_state->sub_sec_security = NULL;
612 continue;
613 }
614
615 /* In the client, try and produce the first (optimistic) packet */
616 if (spnego_state->state_position == SPNEGO_CLIENT_START) {
617 nt_status = gensec_update(spnego_state->sub_sec_security,
618 out_mem_ctx,
619 null_data_blob,
620 &unwrapped_out);
621
622 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
623 && !NT_STATUS_IS_OK(nt_status)) {
624 DEBUG(1, ("SPNEGO(%s) creating NEG_TOKEN_INIT failed: %s\n",
625 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
626 talloc_free(spnego_state->sub_sec_security);
627 spnego_state->sub_sec_security = NULL;
628 /* Pretend we never started it (lets the first run find some incompatible demand) */
629
630 continue;
631 }
632 }
633
634 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
635
636 send_mech_types = gensec_security_oids_from_ops_wrapped(out_mem_ctx,
637 &all_sec[i]);
638
639 ok = spnego_write_mech_types(spnego_state,
640 send_mech_types,
641 &spnego_state->mech_types);
642 if (!ok) {
643 DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
644 return NT_STATUS_NO_MEMORY;
645 }
646
647 /* List the remaining mechs as options */
648 spnego_out.negTokenInit.mechTypes = send_mech_types;
649 spnego_out.negTokenInit.reqFlags = null_data_blob;
650 spnego_out.negTokenInit.reqFlagsPadding = 0;
651
652 if (spnego_state->state_position == SPNEGO_SERVER_START) {
653 spnego_out.negTokenInit.mechListMIC
654 = data_blob_string_const(ADS_IGNORE_PRINCIPAL);
655 } else {
656 spnego_out.negTokenInit.mechListMIC = null_data_blob;
657 }
658
659 spnego_out.negTokenInit.mechToken = unwrapped_out;
660
661 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
662 DEBUG(1, ("Failed to write NEG_TOKEN_INIT\n"));
663 return NT_STATUS_INVALID_PARAMETER;
664 }
665
666 /* set next state */
667 spnego_state->neg_oid = all_sec[i].oid;
668
669 if (NT_STATUS_IS_OK(nt_status)) {
670 spnego_state->no_response_expected = true;
671 }
672
673 return NT_STATUS_MORE_PROCESSING_REQUIRED;
674 }
675 talloc_free(spnego_state->sub_sec_security);
676 spnego_state->sub_sec_security = NULL;
677
678 DEBUG(1, ("Failed to setup SPNEGO negTokenInit request: %s\n", nt_errstr(nt_status)));
679 return NT_STATUS_INVALID_PARAMETER;
680 }
681
682
683 /** create a server negTokenTarg
684 *
685 * This is the case, where the client is the first one who sends data
686 */
687
688 static NTSTATUS gensec_spnego_server_negTokenTarg(struct gensec_security *gensec_security,
689 struct spnego_state *spnego_state,
690 TALLOC_CTX *out_mem_ctx,
691 NTSTATUS nt_status,
692 const DATA_BLOB unwrapped_out,
693 DATA_BLOB mech_list_mic,
694 DATA_BLOB *out)
695 {
696 struct spnego_data spnego_out;
697 DATA_BLOB null_data_blob = data_blob(NULL, 0);
698
699 /* compose reply */
700 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
701 spnego_out.negTokenTarg.responseToken = unwrapped_out;
702 spnego_out.negTokenTarg.mechListMIC = null_data_blob;
703 spnego_out.negTokenTarg.supportedMech = NULL;
704
705 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
706 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
707 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
708 spnego_state->state_position = SPNEGO_SERVER_TARG;
709 } else if (NT_STATUS_IS_OK(nt_status)) {
710 if (unwrapped_out.data) {
711 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
712 }
713 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
714 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
715 spnego_state->state_position = SPNEGO_DONE;
716 } else {
717 spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
718 DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
719 spnego_state->state_position = SPNEGO_DONE;
720 }
721
722 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
723 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
724 return NT_STATUS_INVALID_PARAMETER;
725 }
726
727 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
728
729 return nt_status;
730 }
731
732
733 static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
734 const DATA_BLOB in, DATA_BLOB *out)
735 {
736 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
737 DATA_BLOB null_data_blob = data_blob(NULL, 0);
738 DATA_BLOB mech_list_mic = data_blob(NULL, 0);
739 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
740 struct spnego_data spnego_out;
741 struct spnego_data spnego;
742
743 ssize_t len;
744
745 *out = data_blob(NULL, 0);
746
747 if (!out_mem_ctx) {
748 out_mem_ctx = spnego_state;
749 }
750
751 /* and switch into the state machine */
752
753 switch (spnego_state->state_position) {
754 case SPNEGO_FALLBACK:
755 return gensec_update(spnego_state->sub_sec_security,
756 out_mem_ctx, in, out);
757 case SPNEGO_SERVER_START:
758 {
759 NTSTATUS nt_status;
760 if (in.length) {
761
762 len = spnego_read_data(gensec_security, in, &spnego);
763 if (len == -1) {
764 return gensec_spnego_server_try_fallback(gensec_security, spnego_state,
765 out_mem_ctx, in, out);
766 }
767 /* client sent NegTargetInit, we send NegTokenTarg */
768
769 /* OK, so it's real SPNEGO, check the packet's the one we expect */
770 if (spnego.type != spnego_state->expected_packet) {
771 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
772 spnego_state->expected_packet));
773 dump_data(1, in.data, in.length);
774 spnego_free_data(&spnego);
775 return NT_STATUS_INVALID_PARAMETER;
776 }
777
778 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
779 spnego_state,
780 out_mem_ctx,
781 spnego.negTokenInit.mechTypes,
782 spnego.negTokenInit.mechToken,
783 &unwrapped_out);
784
785 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
786 spnego_state,
787 out_mem_ctx,
788 nt_status,
789 unwrapped_out,
790 null_data_blob,
791 out);
792
793 spnego_free_data(&spnego);
794
795 return nt_status;
796 } else {
797 nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
798 out_mem_ctx, in, out);
799 spnego_state->state_position = SPNEGO_SERVER_START;
800 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
801 return nt_status;
802 }
803 }
804
805 case SPNEGO_CLIENT_START:
806 {
807 /* The server offers a list of mechanisms */
808
809 const char *my_mechs[] = {NULL, NULL};
810 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
811
812 if (!in.length) {
813 /* client to produce negTokenInit */
814 nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
815 out_mem_ctx, in, out);
816 spnego_state->state_position = SPNEGO_CLIENT_TARG;
817 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
818 return nt_status;
819 }
820
821 len = spnego_read_data(gensec_security, in, &spnego);
822
823 if (len == -1) {
824 DEBUG(1, ("Invalid SPNEGO request:\n"));
825 dump_data(1, in.data, in.length);
826 return NT_STATUS_INVALID_PARAMETER;
827 }
828
829 /* OK, so it's real SPNEGO, check the packet's the one we expect */
830 if (spnego.type != spnego_state->expected_packet) {
831 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
832 spnego_state->expected_packet));
833 dump_data(1, in.data, in.length);
834 spnego_free_data(&spnego);
835 return NT_STATUS_INVALID_PARAMETER;
836 }
837
838 if (spnego.negTokenInit.targetPrincipal
839 && strcmp(spnego.negTokenInit.targetPrincipal, ADS_IGNORE_PRINCIPAL) != 0) {
840 DEBUG(5, ("Server claims it's principal name is %s\n", spnego.negTokenInit.targetPrincipal));
841 if (lpcfg_client_use_spnego_principal(gensec_security->settings->lp_ctx)) {
842 gensec_set_target_principal(gensec_security, spnego.negTokenInit.targetPrincipal);
843 }
844 }
845
846 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
847 spnego_state,
848 out_mem_ctx,
849 spnego.negTokenInit.mechTypes,
850 spnego.negTokenInit.mechToken,
851 &unwrapped_out);
852
853 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
854 spnego_free_data(&spnego);
855 return nt_status;
856 }
857
858 my_mechs[0] = spnego_state->neg_oid;
859 /* compose reply */
860 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
861 spnego_out.negTokenInit.mechTypes = my_mechs;
862 spnego_out.negTokenInit.reqFlags = null_data_blob;
863 spnego_out.negTokenInit.reqFlagsPadding = 0;
864 spnego_out.negTokenInit.mechListMIC = null_data_blob;
865 spnego_out.negTokenInit.mechToken = unwrapped_out;
866
867 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
868 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
869 return NT_STATUS_INVALID_PARAMETER;
870 }
871
872 /* set next state */
873 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
874 spnego_state->state_position = SPNEGO_CLIENT_TARG;
875
876 if (NT_STATUS_IS_OK(nt_status)) {
877 spnego_state->no_response_expected = true;
878 }
879
880 spnego_free_data(&spnego);
881 return NT_STATUS_MORE_PROCESSING_REQUIRED;
882 }
883 case SPNEGO_SERVER_TARG:
884 {
885 NTSTATUS nt_status;
886 bool new_spnego = false;
887
888 if (!in.length) {
889 return NT_STATUS_INVALID_PARAMETER;
890 }
891
892 len = spnego_read_data(gensec_security, in, &spnego);
893
894 if (len == -1) {
895 DEBUG(1, ("Invalid SPNEGO request:\n"));
896 dump_data(1, in.data, in.length);
897 return NT_STATUS_INVALID_PARAMETER;
898 }
899
900 /* OK, so it's real SPNEGO, check the packet's the one we expect */
901 if (spnego.type != spnego_state->expected_packet) {
902 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
903 spnego_state->expected_packet));
904 dump_data(1, in.data, in.length);
905 spnego_free_data(&spnego);
906 return NT_STATUS_INVALID_PARAMETER;
907 }
908
909 if (!spnego_state->sub_sec_security) {
910 DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
911 spnego_free_data(&spnego);
912 return NT_STATUS_INVALID_PARAMETER;
913 }
914
915 nt_status = gensec_update(spnego_state->sub_sec_security,
916 out_mem_ctx,
917 spnego.negTokenTarg.responseToken,
918 &unwrapped_out);
919 if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
920 new_spnego = true;
921 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
922 out_mem_ctx,
923 spnego_state->mech_types.data,
924 spnego_state->mech_types.length,
925 spnego_state->mech_types.data,
926 spnego_state->mech_types.length,
927 &spnego.negTokenTarg.mechListMIC);
928 if (!NT_STATUS_IS_OK(nt_status)) {
929 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
930 nt_errstr(nt_status)));
931 }
932 }
933 if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
934 nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
935 out_mem_ctx,
936 spnego_state->mech_types.data,
937 spnego_state->mech_types.length,
938 spnego_state->mech_types.data,
939 spnego_state->mech_types.length,
940 &mech_list_mic);
941 if (!NT_STATUS_IS_OK(nt_status)) {
942 DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
943 nt_errstr(nt_status)));
944 }
945 }
946
947 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
948 spnego_state,
949 out_mem_ctx,
950 nt_status,
951 unwrapped_out,
952 mech_list_mic,
953 out);
954
955 spnego_free_data(&spnego);
956
957 return nt_status;
958 }
959 case SPNEGO_CLIENT_TARG:
960 {
961 NTSTATUS nt_status;
962 if (!in.length) {
963 return NT_STATUS_INVALID_PARAMETER;
964 }
965
966 len = spnego_read_data(gensec_security, in, &spnego);
967
968 if (len == -1) {
969 DEBUG(1, ("Invalid SPNEGO request:\n"));
970 dump_data(1, in.data, in.length);
971 return NT_STATUS_INVALID_PARAMETER;
972 }
973
974 /* OK, so it's real SPNEGO, check the packet's the one we expect */
975 if (spnego.type != spnego_state->expected_packet) {
976 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
977 spnego_state->expected_packet));
978 dump_data(1, in.data, in.length);
979 spnego_free_data(&spnego);
980 return NT_STATUS_INVALID_PARAMETER;
981 }
982
983 if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
984 spnego_free_data(&spnego);
985 return NT_STATUS_ACCESS_DENIED;
986 }
987
988 /* Server didn't like our choice of mech, and chose something else */
989 if ((spnego.negTokenTarg.negResult == SPNEGO_ACCEPT_INCOMPLETE) &&
990 spnego.negTokenTarg.supportedMech &&
991 strcmp(spnego.negTokenTarg.supportedMech, spnego_state->neg_oid) != 0) {
992 DEBUG(3,("GENSEC SPNEGO: client preferred mech (%s) not accepted, server wants: %s\n",
993 gensec_get_name_by_oid(gensec_security, spnego.negTokenTarg.supportedMech),
994 gensec_get_name_by_oid(gensec_security, spnego_state->neg_oid)));
995
996 talloc_free(spnego_state->sub_sec_security);
997 nt_status = gensec_subcontext_start(spnego_state,
998 gensec_security,
999 &spnego_state->sub_sec_security);
1000 if (!NT_STATUS_IS_OK(nt_status)) {
1001 spnego_free_data(&spnego);
1002 return nt_status;
1003 }
1004 /* select the sub context */
1005 nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
1006 spnego.negTokenTarg.supportedMech);
1007 if (!NT_STATUS_IS_OK(nt_status)) {
1008 spnego_free_data(&spnego);
1009 return nt_status;
1010 }
1011
1012 nt_status = gensec_update(spnego_state->sub_sec_security,
1013 out_mem_ctx,
1014 spnego.negTokenTarg.responseToken,
1015 &unwrapped_out);
1016 spnego_state->neg_oid = talloc_strdup(spnego_state, spnego.negTokenTarg.supportedMech);
1017 } else if (spnego_state->no_response_expected) {
1018 if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1019 DEBUG(3,("GENSEC SPNEGO: client GENSEC accepted, but server rejected (bad password?)\n"));
1020 nt_status = NT_STATUS_INVALID_PARAMETER;
1021 } else if (spnego.negTokenTarg.responseToken.length) {
1022 DEBUG(2,("GENSEC SPNEGO: client GENSEC accepted, but server continued negotiation!\n"));
1023 nt_status = NT_STATUS_INVALID_PARAMETER;
1024 } else {
1025 nt_status = NT_STATUS_OK;
1026 }
1027 if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
1028 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
1029 out_mem_ctx,
1030 spnego_state->mech_types.data,
1031 spnego_state->mech_types.length,
1032 spnego_state->mech_types.data,
1033 spnego_state->mech_types.length,
1034 &spnego.negTokenTarg.mechListMIC);
1035 if (!NT_STATUS_IS_OK(nt_status)) {
1036 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
1037 nt_errstr(nt_status)));
1038 }
1039 }
1040 } else {
1041 bool new_spnego = false;
1042
1043 nt_status = gensec_update(spnego_state->sub_sec_security,
1044 out_mem_ctx,
1045 spnego.negTokenTarg.responseToken,
1046 &unwrapped_out);
1047
1048 if (NT_STATUS_IS_OK(nt_status)
1049 && spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1050 new_spnego = gensec_have_feature(spnego_state->sub_sec_security,
1051 GENSEC_FEATURE_NEW_SPNEGO);
1052 }
1053 if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
1054 nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
1055 out_mem_ctx,
1056 spnego_state->mech_types.data,
1057 spnego_state->mech_types.length,
1058 spnego_state->mech_types.data,
1059 spnego_state->mech_types.length,
1060 &mech_list_mic);
1061 if (!NT_STATUS_IS_OK(nt_status)) {
1062 DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
1063 nt_errstr(nt_status)));
1064 }
1065 }
1066 if (NT_STATUS_IS_OK(nt_status)) {
1067 spnego_state->no_response_expected = true;
1068 }
1069 }
1070
1071 spnego_free_data(&spnego);
1072
1073 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
1074 && !NT_STATUS_IS_OK(nt_status)) {
1075 DEBUG(1, ("SPNEGO(%s) login failed: %s\n",
1076 spnego_state->sub_sec_security->ops->name,
1077 nt_errstr(nt_status)));
1078 return nt_status;
1079 }
1080
1081 if (unwrapped_out.length || mech_list_mic.length) {
1082 /* compose reply */
1083 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
1084 spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
1085 spnego_out.negTokenTarg.supportedMech = NULL;
1086 spnego_out.negTokenTarg.responseToken = unwrapped_out;
1087 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
1088
1089 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
1090 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
1091 return NT_STATUS_INVALID_PARAMETER;
1092 }
1093
1094 spnego_state->state_position = SPNEGO_CLIENT_TARG;
1095 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
1096 } else {
1097
1098 /* all done - server has accepted, and we agree */
1099 *out = null_data_blob;
1100
1101 if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1102 /* unless of course it did not accept */
1103 DEBUG(1,("gensec_update ok but not accepted\n"));
1104 nt_status = NT_STATUS_INVALID_PARAMETER;
1105 }
1106
1107 spnego_state->state_position = SPNEGO_DONE;
1108 }
1109
1110 return nt_status;
1111 }
1112 case SPNEGO_DONE:
1113 /* We should not be called after we are 'done' */
1114 return NT_STATUS_INVALID_PARAMETER;
1115 }
1116 return NT_STATUS_INVALID_PARAMETER;
1117 }
1118
1119 static void gensec_spnego_want_feature(struct gensec_security *gensec_security,
1120 uint32_t feature)
1121 {
1122 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1123
1124 if (!spnego_state || !spnego_state->sub_sec_security) {
1125 gensec_security->want_features |= feature;
1126 return;
1127 }
1128
1129 gensec_want_feature(spnego_state->sub_sec_security,
1130 feature);
1131 }
1132
1133 static bool gensec_spnego_have_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 if (!spnego_state->sub_sec_security) {
1138 return false;
1139 }
1140
1141 return gensec_have_feature(spnego_state->sub_sec_security,
1142 feature);
1143 }
1144
1145 static const char *gensec_spnego_oids[] = {
1146 GENSEC_OID_SPNEGO,
1147 NULL
1148 };
1149
1150 static const struct gensec_security_ops gensec_spnego_security_ops = {
1151 .name = "spnego",
1152 .sasl_name = "GSS-SPNEGO",
1153 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1154 .oid = gensec_spnego_oids,
1155 .client_start = gensec_spnego_client_start,
1156 .server_start = gensec_spnego_server_start,
1157 .update = gensec_spnego_update,
1158 .seal_packet = gensec_spnego_seal_packet,
1159 .sign_packet = gensec_spnego_sign_packet,
1160 .sig_size = gensec_spnego_sig_size,
1161 .max_wrapped_size = gensec_spnego_max_wrapped_size,
1162 .max_input_size = gensec_spnego_max_input_size,
1163 .check_packet = gensec_spnego_check_packet,
1164 .unseal_packet = gensec_spnego_unseal_packet,
1165 .packet_full_request = gensec_spnego_packet_full_request,
1166 .wrap = gensec_spnego_wrap,
1167 .unwrap = gensec_spnego_unwrap,
1168 .wrap_packets = gensec_spnego_wrap_packets,
1169 .unwrap_packets = gensec_spnego_unwrap_packets,
1170 .session_key = gensec_spnego_session_key,
1171 .session_info = gensec_spnego_session_info,
1172 .want_feature = gensec_spnego_want_feature,
1173 .have_feature = gensec_spnego_have_feature,
1174 .enabled = true,
1175 .priority = GENSEC_SPNEGO
1176 };
1177
1178 _PUBLIC_ NTSTATUS gensec_spnego_init(void)
1179 {
1180 NTSTATUS ret;
1181 ret = gensec_register(&gensec_spnego_security_ops);
1182 if (!NT_STATUS_IS_OK(ret)) {
1183 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1184 gensec_spnego_security_ops.name));
1185 return ret;
1186 }
1187
1188 return ret;
1189 }
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