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spnego: Support ASN.1 BIT STRING and use it in SPNEGO.
[Samba/aatanasov.git] / source4 / auth / gensec / spnego.c
blob977d52ec10798b1686a86fc561b46551ab82290e
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
32 enum spnego_state_position {
33 SPNEGO_SERVER_START,
34 SPNEGO_CLIENT_START,
35 SPNEGO_SERVER_TARG,
36 SPNEGO_CLIENT_TARG,
37 SPNEGO_FALLBACK,
38 SPNEGO_DONE
39 };
40
41 struct spnego_state {
42 enum spnego_message_type expected_packet;
43 enum spnego_state_position state_position;
44 struct gensec_security *sub_sec_security;
45 bool no_response_expected;
46
47 const char *neg_oid;
48
49 DATA_BLOB mech_types;
50 };
51
52
53 static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_security)
54 {
55 struct spnego_state *spnego_state;
56
57 spnego_state = talloc(gensec_security, struct spnego_state);
58 if (!spnego_state) {
59 return NT_STATUS_NO_MEMORY;
60 }
61
62 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
63 spnego_state->state_position = SPNEGO_CLIENT_START;
64 spnego_state->sub_sec_security = NULL;
65 spnego_state->no_response_expected = false;
66 spnego_state->mech_types = data_blob(NULL, 0);
67
68 gensec_security->private_data = spnego_state;
69 return NT_STATUS_OK;
70 }
71
72 static NTSTATUS gensec_spnego_server_start(struct gensec_security *gensec_security)
73 {
74 struct spnego_state *spnego_state;
75
76 spnego_state = talloc(gensec_security, struct spnego_state);
77 if (!spnego_state) {
78 return NT_STATUS_NO_MEMORY;
79 }
80
81 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
82 spnego_state->state_position = SPNEGO_SERVER_START;
83 spnego_state->sub_sec_security = NULL;
84 spnego_state->no_response_expected = false;
85 spnego_state->mech_types = data_blob(NULL, 0);
86
87 gensec_security->private_data = spnego_state;
88 return NT_STATUS_OK;
89 }
90
91 /*
92 wrappers for the spnego_*() functions
93 */
94 static NTSTATUS gensec_spnego_unseal_packet(struct gensec_security *gensec_security,
95 TALLOC_CTX *mem_ctx,
96 uint8_t *data, size_t length,
97 const uint8_t *whole_pdu, size_t pdu_length,
98 const DATA_BLOB *sig)
99 {
100 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
101
102 if (spnego_state->state_position != SPNEGO_DONE
103 && spnego_state->state_position != SPNEGO_FALLBACK) {
104 return NT_STATUS_INVALID_PARAMETER;
105 }
106
107 return gensec_unseal_packet(spnego_state->sub_sec_security,
108 mem_ctx,
109 data, length,
110 whole_pdu, pdu_length,
111 sig);
112 }
113
114 static NTSTATUS gensec_spnego_check_packet(struct gensec_security *gensec_security,
115 TALLOC_CTX *mem_ctx,
116 const uint8_t *data, size_t length,
117 const uint8_t *whole_pdu, size_t pdu_length,
118 const DATA_BLOB *sig)
119 {
120 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
121
122 if (spnego_state->state_position != SPNEGO_DONE
123 && spnego_state->state_position != SPNEGO_FALLBACK) {
124 return NT_STATUS_INVALID_PARAMETER;
125 }
126
127 return gensec_check_packet(spnego_state->sub_sec_security,
128 mem_ctx,
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 DATA_BLOB *session_key)
299 {
300 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
301 if (!spnego_state->sub_sec_security) {
302 return NT_STATUS_INVALID_PARAMETER;
303 }
304
305 return gensec_session_key(spnego_state->sub_sec_security,
306 session_key);
307 }
308
309 static NTSTATUS gensec_spnego_session_info(struct gensec_security *gensec_security,
310 struct auth_session_info **session_info)
311 {
312 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
313 if (!spnego_state->sub_sec_security) {
314 return NT_STATUS_INVALID_PARAMETER;
315 }
316
317 return gensec_session_info(spnego_state->sub_sec_security,
318 session_info);
319 }
320
321 /** Fallback to another GENSEC mechanism, based on magic strings
322 *
323 * This is the 'fallback' case, where we don't get SPNEGO, and have to
324 * try all the other options (and hope they all have a magic string
325 * they check)
326 */
327
328 static NTSTATUS gensec_spnego_server_try_fallback(struct gensec_security *gensec_security,
329 struct spnego_state *spnego_state,
330 TALLOC_CTX *out_mem_ctx,
331 const DATA_BLOB in, DATA_BLOB *out)
332 {
333 int i,j;
334 struct gensec_security_ops **all_ops
335 = gensec_security_mechs(gensec_security, out_mem_ctx);
336 for (i=0; all_ops[i]; i++) {
337 bool is_spnego;
338 NTSTATUS nt_status;
339
340 if (gensec_security != NULL &&
341 !gensec_security_ops_enabled(all_ops[i], gensec_security->settings->lp_ctx))
342 continue;
343
344 if (!all_ops[i]->oid) {
345 continue;
346 }
347
348 is_spnego = false;
349 for (j=0; all_ops[i]->oid[j]; j++) {
350 if (strcasecmp(GENSEC_OID_SPNEGO,all_ops[i]->oid[j]) == 0) {
351 is_spnego = true;
352 }
353 }
354 if (is_spnego) {
355 continue;
356 }
357
358 if (!all_ops[i]->magic) {
359 continue;
360 }
361
362 nt_status = all_ops[i]->magic(gensec_security, &in);
363 if (!NT_STATUS_IS_OK(nt_status)) {
364 continue;
365 }
366
367 spnego_state->state_position = SPNEGO_FALLBACK;
368
369 nt_status = gensec_subcontext_start(spnego_state,
370 gensec_security,
371 &spnego_state->sub_sec_security);
372
373 if (!NT_STATUS_IS_OK(nt_status)) {
374 return nt_status;
375 }
376 /* select the sub context */
377 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
378 all_ops[i]);
379 if (!NT_STATUS_IS_OK(nt_status)) {
380 return nt_status;
381 }
382 nt_status = gensec_update(spnego_state->sub_sec_security,
383 out_mem_ctx, in, out);
384 return nt_status;
385 }
386 DEBUG(1, ("Failed to parse SPNEGO request\n"));
387 return NT_STATUS_INVALID_PARAMETER;
388
389 }
390
391 /*
392 Parse the netTokenInit, either from the client, to the server, or
393 from the server to the client.
394 */
395
396 static NTSTATUS gensec_spnego_parse_negTokenInit(struct gensec_security *gensec_security,
397 struct spnego_state *spnego_state,
398 TALLOC_CTX *out_mem_ctx,
399 const char **mechType,
400 const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out)
401 {
402 int i;
403 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
404 DATA_BLOB null_data_blob = data_blob(NULL,0);
405 bool ok;
406
407 const struct gensec_security_ops_wrapper *all_sec
408 = gensec_security_by_oid_list(gensec_security,
409 out_mem_ctx,
410 mechType,
411 GENSEC_OID_SPNEGO);
412
413 ok = spnego_write_mech_types(spnego_state,
414 mechType,
415 &spnego_state->mech_types);
416 if (!ok) {
417 DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
418 return NT_STATUS_NO_MEMORY;
419 }
420
421 if (spnego_state->state_position == SPNEGO_SERVER_START) {
422 for (i=0; all_sec && all_sec[i].op; i++) {
423 /* optomisitic token */
424 if (strcmp(all_sec[i].oid, mechType[0]) == 0) {
425 nt_status = gensec_subcontext_start(spnego_state,
426 gensec_security,
427 &spnego_state->sub_sec_security);
428 if (!NT_STATUS_IS_OK(nt_status)) {
429 return nt_status;
430 }
431 /* select the sub context */
432 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
433 all_sec[i].op);
434 if (!NT_STATUS_IS_OK(nt_status)) {
435 talloc_free(spnego_state->sub_sec_security);
436 spnego_state->sub_sec_security = NULL;
437 break;
438 }
439
440 nt_status = gensec_update(spnego_state->sub_sec_security,
441 out_mem_ctx,
442 unwrapped_in,
443 unwrapped_out);
444 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
445 NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
446 /* Pretend we never started it (lets the first run find some incompatible demand) */
447
448 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse contents: %s\n",
449 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
450 talloc_free(spnego_state->sub_sec_security);
451 spnego_state->sub_sec_security = NULL;
452 break;
453 }
454
455 spnego_state->neg_oid = all_sec[i].oid;
456 break;
457 }
458 }
459 }
460
461 /* Having tried any optomisitc token from the client (if we
462 * were the server), if we didn't get anywhere, walk our list
463 * in our preference order */
464
465 if (!spnego_state->sub_sec_security) {
466 for (i=0; all_sec && all_sec[i].op; i++) {
467 nt_status = gensec_subcontext_start(spnego_state,
468 gensec_security,
469 &spnego_state->sub_sec_security);
470 if (!NT_STATUS_IS_OK(nt_status)) {
471 return nt_status;
472 }
473 /* select the sub context */
474 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
475 all_sec[i].op);
476 if (!NT_STATUS_IS_OK(nt_status)) {
477 talloc_free(spnego_state->sub_sec_security);
478 spnego_state->sub_sec_security = NULL;
479 continue;
480 }
481
482 spnego_state->neg_oid = all_sec[i].oid;
483
484 /* only get the helping start blob for the first OID */
485 nt_status = gensec_update(spnego_state->sub_sec_security,
486 out_mem_ctx,
487 null_data_blob,
488 unwrapped_out);
489
490 /* it is likely that a NULL input token will
491 * not be liked by most server mechs, but if
492 * we are in the client, we want the first
493 * update packet to be able to abort the use
494 * of this mech */
495 if (spnego_state->state_position != SPNEGO_SERVER_START) {
496 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
497 NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
498 /* Pretend we never started it (lets the first run find some incompatible demand) */
499
500 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse: %s\n",
501 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
502 talloc_free(spnego_state->sub_sec_security);
503 spnego_state->sub_sec_security = NULL;
504 continue;
505 }
506 }
507
508 break;
509 }
510 }
511
512 if (spnego_state->sub_sec_security) {
513 /* it is likely that a NULL input token will
514 * not be liked by most server mechs, but this
515 * does the right thing in the CIFS client.
516 * just push us along the merry-go-round
517 * again, and hope for better luck next
518 * time */
519
520 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
521 *unwrapped_out = data_blob(NULL, 0);
522 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
523 }
524
525 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)
526 && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
527 && !NT_STATUS_IS_OK(nt_status)) {
528 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
529 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
530 talloc_free(spnego_state->sub_sec_security);
531 spnego_state->sub_sec_security = NULL;
532
533 /* We started the mech correctly, and the
534 * input from the other side was valid.
535 * Return the error (say bad password, invalid
536 * ticket) */
537 return nt_status;
538 }
539
540
541 return nt_status; /* OK, INVALID_PARAMETER ore MORE PROCESSING */
542 }
543
544 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
545 /* we could re-negotiate here, but it would only work
546 * if the client or server lied about what it could
547 * support the first time. Lets keep this code to
548 * reality */
549
550 return nt_status;
551 }
552
553 /** create a negTokenInit
554 *
555 * This is the same packet, no matter if the client or server sends it first, but it is always the first packet
556 */
557 static NTSTATUS gensec_spnego_create_negTokenInit(struct gensec_security *gensec_security,
558 struct spnego_state *spnego_state,
559 TALLOC_CTX *out_mem_ctx,
560 const DATA_BLOB in, DATA_BLOB *out)
561 {
562 int i;
563 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
564 DATA_BLOB null_data_blob = data_blob(NULL,0);
565 const char **mechTypes = NULL;
566 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
567 const struct gensec_security_ops_wrapper *all_sec;
568 const char *principal = NULL;
569
570 mechTypes = gensec_security_oids(gensec_security,
571 out_mem_ctx, GENSEC_OID_SPNEGO);
572
573 all_sec = gensec_security_by_oid_list(gensec_security,
574 out_mem_ctx,
575 mechTypes,
576 GENSEC_OID_SPNEGO);
577 for (i=0; all_sec && all_sec[i].op; i++) {
578 struct spnego_data spnego_out;
579 const char **send_mech_types;
580 bool ok;
581
582 nt_status = gensec_subcontext_start(spnego_state,
583 gensec_security,
584 &spnego_state->sub_sec_security);
585 if (!NT_STATUS_IS_OK(nt_status)) {
586 return nt_status;
587 }
588 /* select the sub context */
589 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
590 all_sec[i].op);
591 if (!NT_STATUS_IS_OK(nt_status)) {
592 talloc_free(spnego_state->sub_sec_security);
593 spnego_state->sub_sec_security = NULL;
594 continue;
595 }
596
597 /* In the client, try and produce the first (optimistic) packet */
598 if (spnego_state->state_position == SPNEGO_CLIENT_START) {
599 nt_status = gensec_update(spnego_state->sub_sec_security,
600 out_mem_ctx,
601 null_data_blob,
602 &unwrapped_out);
603
604 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
605 && !NT_STATUS_IS_OK(nt_status)) {
606 DEBUG(1, ("SPNEGO(%s) creating NEG_TOKEN_INIT failed: %s\n",
607 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
608 talloc_free(spnego_state->sub_sec_security);
609 spnego_state->sub_sec_security = NULL;
610 /* Pretend we never started it (lets the first run find some incompatible demand) */
611
612 continue;
613 }
614 }
615
616 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
617
618 send_mech_types = gensec_security_oids_from_ops_wrapped(out_mem_ctx,
619 &all_sec[i]);
620
621 ok = spnego_write_mech_types(spnego_state,
622 send_mech_types,
623 &spnego_state->mech_types);
624 if (!ok) {
625 DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
626 return NT_STATUS_NO_MEMORY;
627 }
628
629 /* List the remaining mechs as options */
630 spnego_out.negTokenInit.mechTypes = send_mech_types;
631 spnego_out.negTokenInit.reqFlags = null_data_blob;
632 spnego_out.negTokenInit.reqFlagsPadding = 0;
633
634 if (spnego_state->state_position == SPNEGO_SERVER_START) {
635 /* server credentials */
636 struct cli_credentials *creds = gensec_get_credentials(gensec_security);
637 if (creds) {
638 principal = cli_credentials_get_principal(creds, out_mem_ctx);
639 }
640 }
641 if (principal) {
642 spnego_out.negTokenInit.mechListMIC
643 = data_blob_string_const(principal);
644 } else {
645 spnego_out.negTokenInit.mechListMIC = null_data_blob;
646 }
647
648 spnego_out.negTokenInit.mechToken = unwrapped_out;
649
650 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
651 DEBUG(1, ("Failed to write NEG_TOKEN_INIT\n"));
652 return NT_STATUS_INVALID_PARAMETER;
653 }
654
655 /* set next state */
656 spnego_state->neg_oid = all_sec[i].oid;
657
658 if (NT_STATUS_IS_OK(nt_status)) {
659 spnego_state->no_response_expected = true;
660 }
661
662 return NT_STATUS_MORE_PROCESSING_REQUIRED;
663 }
664 talloc_free(spnego_state->sub_sec_security);
665 spnego_state->sub_sec_security = NULL;
666
667 DEBUG(1, ("Failed to setup SPNEGO negTokenInit request: %s\n", nt_errstr(nt_status)));
668 return NT_STATUS_INVALID_PARAMETER;
669 }
670
671
672 /** create a server negTokenTarg
673 *
674 * This is the case, where the client is the first one who sends data
675 */
676
677 static NTSTATUS gensec_spnego_server_negTokenTarg(struct gensec_security *gensec_security,
678 struct spnego_state *spnego_state,
679 TALLOC_CTX *out_mem_ctx,
680 NTSTATUS nt_status,
681 const DATA_BLOB unwrapped_out,
682 DATA_BLOB mech_list_mic,
683 DATA_BLOB *out)
684 {
685 struct spnego_data spnego_out;
686 DATA_BLOB null_data_blob = data_blob(NULL, 0);
687
688 /* compose reply */
689 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
690 spnego_out.negTokenTarg.responseToken = unwrapped_out;
691 spnego_out.negTokenTarg.mechListMIC = null_data_blob;
692 spnego_out.negTokenTarg.supportedMech = NULL;
693
694 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
695 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
696 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
697 spnego_state->state_position = SPNEGO_SERVER_TARG;
698 } else if (NT_STATUS_IS_OK(nt_status)) {
699 if (unwrapped_out.data) {
700 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
701 }
702 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
703 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
704 spnego_state->state_position = SPNEGO_DONE;
705 } else {
706 spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
707 DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
708 spnego_state->state_position = SPNEGO_DONE;
709 }
710
711 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
712 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
713 return NT_STATUS_INVALID_PARAMETER;
714 }
715
716 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
717
718 return nt_status;
719 }
720
721
722 static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
723 const DATA_BLOB in, DATA_BLOB *out)
724 {
725 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
726 DATA_BLOB null_data_blob = data_blob(NULL, 0);
727 DATA_BLOB mech_list_mic = data_blob(NULL, 0);
728 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
729 struct spnego_data spnego_out;
730 struct spnego_data spnego;
731
732 ssize_t len;
733
734 *out = data_blob(NULL, 0);
735
736 if (!out_mem_ctx) {
737 out_mem_ctx = spnego_state;
738 }
739
740 /* and switch into the state machine */
741
742 switch (spnego_state->state_position) {
743 case SPNEGO_FALLBACK:
744 return gensec_update(spnego_state->sub_sec_security,
745 out_mem_ctx, in, out);
746 case SPNEGO_SERVER_START:
747 {
748 NTSTATUS nt_status;
749 if (in.length) {
750
751 len = spnego_read_data(gensec_security, in, &spnego);
752 if (len == -1) {
753 return gensec_spnego_server_try_fallback(gensec_security, spnego_state,
754 out_mem_ctx, in, out);
755 }
756 /* client sent NegTargetInit, we send NegTokenTarg */
757
758 /* OK, so it's real SPNEGO, check the packet's the one we expect */
759 if (spnego.type != spnego_state->expected_packet) {
760 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
761 spnego_state->expected_packet));
762 dump_data(1, in.data, in.length);
763 spnego_free_data(&spnego);
764 return NT_STATUS_INVALID_PARAMETER;
765 }
766
767 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
768 spnego_state,
769 out_mem_ctx,
770 spnego.negTokenInit.mechTypes,
771 spnego.negTokenInit.mechToken,
772 &unwrapped_out);
773
774 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
775 spnego_state,
776 out_mem_ctx,
777 nt_status,
778 unwrapped_out,
779 null_data_blob,
780 out);
781
782 spnego_free_data(&spnego);
783
784 return nt_status;
785 } else {
786 nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
787 out_mem_ctx, in, out);
788 spnego_state->state_position = SPNEGO_SERVER_START;
789 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
790 return nt_status;
791 }
792 }
793
794 case SPNEGO_CLIENT_START:
795 {
796 /* The server offers a list of mechanisms */
797
798 const char *my_mechs[] = {NULL, NULL};
799 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
800
801 if (!in.length) {
802 /* client to produce negTokenInit */
803 nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
804 out_mem_ctx, in, out);
805 spnego_state->state_position = SPNEGO_CLIENT_TARG;
806 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
807 return nt_status;
808 }
809
810 len = spnego_read_data(gensec_security, in, &spnego);
811
812 if (len == -1) {
813 DEBUG(1, ("Invalid SPNEGO request:\n"));
814 dump_data(1, in.data, in.length);
815 return NT_STATUS_INVALID_PARAMETER;
816 }
817
818 /* OK, so it's real SPNEGO, check the packet's the one we expect */
819 if (spnego.type != spnego_state->expected_packet) {
820 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
821 spnego_state->expected_packet));
822 dump_data(1, in.data, in.length);
823 spnego_free_data(&spnego);
824 return NT_STATUS_INVALID_PARAMETER;
825 }
826
827 if (spnego.negTokenInit.targetPrincipal) {
828 DEBUG(5, ("Server claims it's principal name is %s\n", spnego.negTokenInit.targetPrincipal));
829 gensec_set_target_principal(gensec_security, spnego.negTokenInit.targetPrincipal);
830 }
831
832 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
833 spnego_state,
834 out_mem_ctx,
835 spnego.negTokenInit.mechTypes,
836 spnego.negTokenInit.mechToken,
837 &unwrapped_out);
838
839 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
840 spnego_free_data(&spnego);
841 return nt_status;
842 }
843
844 my_mechs[0] = spnego_state->neg_oid;
845 /* compose reply */
846 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
847 spnego_out.negTokenInit.mechTypes = my_mechs;
848 spnego_out.negTokenInit.reqFlags = null_data_blob;
849 spnego_out.negTokenInit.reqFlagsPadding = 0;
850 spnego_out.negTokenInit.mechListMIC = null_data_blob;
851 spnego_out.negTokenInit.mechToken = unwrapped_out;
852
853 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
854 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
855 return NT_STATUS_INVALID_PARAMETER;
856 }
857
858 /* set next state */
859 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
860 spnego_state->state_position = SPNEGO_CLIENT_TARG;
861
862 if (NT_STATUS_IS_OK(nt_status)) {
863 spnego_state->no_response_expected = true;
864 }
865
866 spnego_free_data(&spnego);
867 return NT_STATUS_MORE_PROCESSING_REQUIRED;
868 }
869 case SPNEGO_SERVER_TARG:
870 {
871 NTSTATUS nt_status;
872 bool new_spnego = false;
873
874 if (!in.length) {
875 return NT_STATUS_INVALID_PARAMETER;
876 }
877
878 len = spnego_read_data(gensec_security, in, &spnego);
879
880 if (len == -1) {
881 DEBUG(1, ("Invalid SPNEGO request:\n"));
882 dump_data(1, in.data, in.length);
883 return NT_STATUS_INVALID_PARAMETER;
884 }
885
886 /* OK, so it's real SPNEGO, check the packet's the one we expect */
887 if (spnego.type != spnego_state->expected_packet) {
888 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
889 spnego_state->expected_packet));
890 dump_data(1, in.data, in.length);
891 spnego_free_data(&spnego);
892 return NT_STATUS_INVALID_PARAMETER;
893 }
894
895 if (!spnego_state->sub_sec_security) {
896 DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
897 spnego_free_data(&spnego);
898 return NT_STATUS_INVALID_PARAMETER;
899 }
900
901 nt_status = gensec_update(spnego_state->sub_sec_security,
902 out_mem_ctx,
903 spnego.negTokenTarg.responseToken,
904 &unwrapped_out);
905 if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
906 new_spnego = true;
907 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
908 out_mem_ctx,
909 spnego_state->mech_types.data,
910 spnego_state->mech_types.length,
911 spnego_state->mech_types.data,
912 spnego_state->mech_types.length,
913 &spnego.negTokenTarg.mechListMIC);
914 if (!NT_STATUS_IS_OK(nt_status)) {
915 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
916 nt_errstr(nt_status)));
917 }
918 }
919 if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
920 nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
921 out_mem_ctx,
922 spnego_state->mech_types.data,
923 spnego_state->mech_types.length,
924 spnego_state->mech_types.data,
925 spnego_state->mech_types.length,
926 &mech_list_mic);
927 if (!NT_STATUS_IS_OK(nt_status)) {
928 DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
929 nt_errstr(nt_status)));
930 }
931 }
932
933 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
934 spnego_state,
935 out_mem_ctx,
936 nt_status,
937 unwrapped_out,
938 mech_list_mic,
939 out);
940
941 spnego_free_data(&spnego);
942
943 return nt_status;
944 }
945 case SPNEGO_CLIENT_TARG:
946 {
947 NTSTATUS nt_status;
948 if (!in.length) {
949 return NT_STATUS_INVALID_PARAMETER;
950 }
951
952 len = spnego_read_data(gensec_security, in, &spnego);
953
954 if (len == -1) {
955 DEBUG(1, ("Invalid SPNEGO request:\n"));
956 dump_data(1, in.data, in.length);
957 return NT_STATUS_INVALID_PARAMETER;
958 }
959
960 /* OK, so it's real SPNEGO, check the packet's the one we expect */
961 if (spnego.type != spnego_state->expected_packet) {
962 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
963 spnego_state->expected_packet));
964 dump_data(1, in.data, in.length);
965 spnego_free_data(&spnego);
966 return NT_STATUS_INVALID_PARAMETER;
967 }
968
969 if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
970 spnego_free_data(&spnego);
971 return NT_STATUS_ACCESS_DENIED;
972 }
973
974 /* Server didn't like our choice of mech, and chose something else */
975 if ((spnego.negTokenTarg.negResult == SPNEGO_ACCEPT_INCOMPLETE) &&
976 spnego.negTokenTarg.supportedMech &&
977 strcmp(spnego.negTokenTarg.supportedMech, spnego_state->neg_oid) != 0) {
978 DEBUG(3,("GENSEC SPNEGO: client preferred mech (%s) not accepted, server wants: %s\n",
979 gensec_get_name_by_oid(gensec_security, spnego.negTokenTarg.supportedMech),
980 gensec_get_name_by_oid(gensec_security, spnego_state->neg_oid)));
981
982 talloc_free(spnego_state->sub_sec_security);
983 nt_status = gensec_subcontext_start(spnego_state,
984 gensec_security,
985 &spnego_state->sub_sec_security);
986 if (!NT_STATUS_IS_OK(nt_status)) {
987 spnego_free_data(&spnego);
988 return nt_status;
989 }
990 /* select the sub context */
991 nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
992 spnego.negTokenTarg.supportedMech);
993 if (!NT_STATUS_IS_OK(nt_status)) {
994 spnego_free_data(&spnego);
995 return nt_status;
996 }
997
998 nt_status = gensec_update(spnego_state->sub_sec_security,
999 out_mem_ctx,
1000 spnego.negTokenTarg.responseToken,
1001 &unwrapped_out);
1002 spnego_state->neg_oid = talloc_strdup(spnego_state, spnego.negTokenTarg.supportedMech);
1003 } else if (spnego_state->no_response_expected) {
1004 if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1005 DEBUG(3,("GENSEC SPNEGO: client GENSEC accepted, but server rejected (bad password?)\n"));
1006 nt_status = NT_STATUS_INVALID_PARAMETER;
1007 } else if (spnego.negTokenTarg.responseToken.length) {
1008 DEBUG(2,("GENSEC SPNEGO: client GENSEC accepted, but server continued negotiation!\n"));
1009 nt_status = NT_STATUS_INVALID_PARAMETER;
1010 } else {
1011 nt_status = NT_STATUS_OK;
1012 }
1013 if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
1014 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
1015 out_mem_ctx,
1016 spnego_state->mech_types.data,
1017 spnego_state->mech_types.length,
1018 spnego_state->mech_types.data,
1019 spnego_state->mech_types.length,
1020 &spnego.negTokenTarg.mechListMIC);
1021 if (!NT_STATUS_IS_OK(nt_status)) {
1022 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
1023 nt_errstr(nt_status)));
1024 }
1025 }
1026 } else {
1027 bool new_spnego = false;
1028
1029 nt_status = gensec_update(spnego_state->sub_sec_security,
1030 out_mem_ctx,
1031 spnego.negTokenTarg.responseToken,
1032 &unwrapped_out);
1033
1034 if (NT_STATUS_IS_OK(nt_status)
1035 && spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1036 new_spnego = gensec_have_feature(spnego_state->sub_sec_security,
1037 GENSEC_FEATURE_NEW_SPNEGO);
1038 }
1039 if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
1040 nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
1041 out_mem_ctx,
1042 spnego_state->mech_types.data,
1043 spnego_state->mech_types.length,
1044 spnego_state->mech_types.data,
1045 spnego_state->mech_types.length,
1046 &mech_list_mic);
1047 if (!NT_STATUS_IS_OK(nt_status)) {
1048 DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
1049 nt_errstr(nt_status)));
1050 }
1051 }
1052 if (NT_STATUS_IS_OK(nt_status)) {
1053 spnego_state->no_response_expected = true;
1054 }
1055 }
1056
1057 spnego_free_data(&spnego);
1058
1059 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
1060 && !NT_STATUS_IS_OK(nt_status)) {
1061 DEBUG(1, ("SPNEGO(%s) login failed: %s\n",
1062 spnego_state->sub_sec_security->ops->name,
1063 nt_errstr(nt_status)));
1064 return nt_status;
1065 }
1066
1067 if (unwrapped_out.length || mech_list_mic.length) {
1068 /* compose reply */
1069 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
1070 spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
1071 spnego_out.negTokenTarg.supportedMech = NULL;
1072 spnego_out.negTokenTarg.responseToken = unwrapped_out;
1073 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
1074
1075 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
1076 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
1077 return NT_STATUS_INVALID_PARAMETER;
1078 }
1079
1080 spnego_state->state_position = SPNEGO_CLIENT_TARG;
1081 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
1082 } else {
1083
1084 /* all done - server has accepted, and we agree */
1085 *out = null_data_blob;
1086
1087 if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1088 /* unless of course it did not accept */
1089 DEBUG(1,("gensec_update ok but not accepted\n"));
1090 nt_status = NT_STATUS_INVALID_PARAMETER;
1091 }
1092
1093 spnego_state->state_position = SPNEGO_DONE;
1094 }
1095
1096 return nt_status;
1097 }
1098 case SPNEGO_DONE:
1099 /* We should not be called after we are 'done' */
1100 return NT_STATUS_INVALID_PARAMETER;
1101 }
1102 return NT_STATUS_INVALID_PARAMETER;
1103 }
1104
1105 static void gensec_spnego_want_feature(struct gensec_security *gensec_security,
1106 uint32_t feature)
1107 {
1108 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1109
1110 if (!spnego_state || !spnego_state->sub_sec_security) {
1111 gensec_security->want_features |= feature;
1112 return;
1113 }
1114
1115 gensec_want_feature(spnego_state->sub_sec_security,
1116 feature);
1117 }
1118
1119 static bool gensec_spnego_have_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 if (!spnego_state->sub_sec_security) {
1124 return false;
1125 }
1126
1127 return gensec_have_feature(spnego_state->sub_sec_security,
1128 feature);
1129 }
1130
1131 static const char *gensec_spnego_oids[] = {
1132 GENSEC_OID_SPNEGO,
1133 NULL
1134 };
1135
1136 static const struct gensec_security_ops gensec_spnego_security_ops = {
1137 .name = "spnego",
1138 .sasl_name = "GSS-SPNEGO",
1139 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1140 .oid = gensec_spnego_oids,
1141 .client_start = gensec_spnego_client_start,
1142 .server_start = gensec_spnego_server_start,
1143 .update = gensec_spnego_update,
1144 .seal_packet = gensec_spnego_seal_packet,
1145 .sign_packet = gensec_spnego_sign_packet,
1146 .sig_size = gensec_spnego_sig_size,
1147 .max_wrapped_size = gensec_spnego_max_wrapped_size,
1148 .max_input_size = gensec_spnego_max_input_size,
1149 .check_packet = gensec_spnego_check_packet,
1150 .unseal_packet = gensec_spnego_unseal_packet,
1151 .packet_full_request = gensec_spnego_packet_full_request,
1152 .wrap = gensec_spnego_wrap,
1153 .unwrap = gensec_spnego_unwrap,
1154 .wrap_packets = gensec_spnego_wrap_packets,
1155 .unwrap_packets = gensec_spnego_unwrap_packets,
1156 .session_key = gensec_spnego_session_key,
1157 .session_info = gensec_spnego_session_info,
1158 .want_feature = gensec_spnego_want_feature,
1159 .have_feature = gensec_spnego_have_feature,
1160 .enabled = true,
1161 .priority = GENSEC_SPNEGO
1162 };
1163
1164 _PUBLIC_ NTSTATUS gensec_spnego_init(void)
1165 {
1166 NTSTATUS ret;
1167 ret = gensec_register(&gensec_spnego_security_ops);
1168 if (!NT_STATUS_IS_OK(ret)) {
1169 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1170 gensec_spnego_security_ops.name));
1171 return ret;
1172 }
1173
1174 return ret;
1175 }
aatanasov's samba4 branch