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s3: Fix bug 7578
[Samba/gebeck_regimport.git] / source4 / auth / gensec / spnego.c
blob612216a0edbfce44e4c882c652665687b0dd919c
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 for (i=0; all_sec && all_sec[i].op; i++) {
424 /* optomisitic token */
425 if (strcmp(all_sec[i].oid, mechType[0]) == 0) {
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 nt_status = gensec_update(spnego_state->sub_sec_security,
442 out_mem_ctx,
443 unwrapped_in,
444 unwrapped_out);
445 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
446 NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
447 /* Pretend we never started it (lets the first run find some incompatible demand) */
448
449 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse contents: %s\n",
450 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
451 talloc_free(spnego_state->sub_sec_security);
452 spnego_state->sub_sec_security = NULL;
453 break;
454 }
455
456 spnego_state->neg_oid = all_sec[i].oid;
457 break;
458 }
459 }
460 }
461
462 /* Having tried any optomisitc token from the client (if we
463 * were the server), if we didn't get anywhere, walk our list
464 * in our preference order */
465
466 if (!spnego_state->sub_sec_security) {
467 for (i=0; all_sec && all_sec[i].op; i++) {
468 nt_status = gensec_subcontext_start(spnego_state,
469 gensec_security,
470 &spnego_state->sub_sec_security);
471 if (!NT_STATUS_IS_OK(nt_status)) {
472 return nt_status;
473 }
474 /* select the sub context */
475 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
476 all_sec[i].op);
477 if (!NT_STATUS_IS_OK(nt_status)) {
478 talloc_free(spnego_state->sub_sec_security);
479 spnego_state->sub_sec_security = NULL;
480 continue;
481 }
482
483 spnego_state->neg_oid = all_sec[i].oid;
484
485 /* only get the helping start blob for the first OID */
486 nt_status = gensec_update(spnego_state->sub_sec_security,
487 out_mem_ctx,
488 null_data_blob,
489 unwrapped_out);
490
491 /* it is likely that a NULL input token will
492 * not be liked by most server mechs, but if
493 * we are in the client, we want the first
494 * update packet to be able to abort the use
495 * of this mech */
496 if (spnego_state->state_position != SPNEGO_SERVER_START) {
497 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
498 NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
499 /* Pretend we never started it (lets the first run find some incompatible demand) */
500
501 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse: %s\n",
502 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
503 talloc_free(spnego_state->sub_sec_security);
504 spnego_state->sub_sec_security = NULL;
505 continue;
506 }
507 }
508
509 break;
510 }
511 }
512
513 if (spnego_state->sub_sec_security) {
514 /* it is likely that a NULL input token will
515 * not be liked by most server mechs, but this
516 * does the right thing in the CIFS client.
517 * just push us along the merry-go-round
518 * again, and hope for better luck next
519 * time */
520
521 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
522 *unwrapped_out = data_blob(NULL, 0);
523 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
524 }
525
526 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)
527 && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
528 && !NT_STATUS_IS_OK(nt_status)) {
529 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
530 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
531 talloc_free(spnego_state->sub_sec_security);
532 spnego_state->sub_sec_security = NULL;
533
534 /* We started the mech correctly, and the
535 * input from the other side was valid.
536 * Return the error (say bad password, invalid
537 * ticket) */
538 return nt_status;
539 }
540
541
542 return nt_status; /* OK, INVALID_PARAMETER ore MORE PROCESSING */
543 }
544
545 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
546 /* we could re-negotiate here, but it would only work
547 * if the client or server lied about what it could
548 * support the first time. Lets keep this code to
549 * reality */
550
551 return nt_status;
552 }
553
554 /** create a negTokenInit
555 *
556 * This is the same packet, no matter if the client or server sends it first, but it is always the first packet
557 */
558 static NTSTATUS gensec_spnego_create_negTokenInit(struct gensec_security *gensec_security,
559 struct spnego_state *spnego_state,
560 TALLOC_CTX *out_mem_ctx,
561 const DATA_BLOB in, DATA_BLOB *out)
562 {
563 int i;
564 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
565 DATA_BLOB null_data_blob = data_blob(NULL,0);
566 const char **mechTypes = NULL;
567 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
568 const struct gensec_security_ops_wrapper *all_sec;
569 const char *principal = NULL;
570
571 mechTypes = gensec_security_oids(gensec_security,
572 out_mem_ctx, GENSEC_OID_SPNEGO);
573
574 all_sec = gensec_security_by_oid_list(gensec_security,
575 out_mem_ctx,
576 mechTypes,
577 GENSEC_OID_SPNEGO);
578 for (i=0; all_sec && all_sec[i].op; i++) {
579 struct spnego_data spnego_out;
580 const char **send_mech_types;
581 bool ok;
582
583 nt_status = gensec_subcontext_start(spnego_state,
584 gensec_security,
585 &spnego_state->sub_sec_security);
586 if (!NT_STATUS_IS_OK(nt_status)) {
587 return nt_status;
588 }
589 /* select the sub context */
590 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
591 all_sec[i].op);
592 if (!NT_STATUS_IS_OK(nt_status)) {
593 talloc_free(spnego_state->sub_sec_security);
594 spnego_state->sub_sec_security = NULL;
595 continue;
596 }
597
598 /* In the client, try and produce the first (optimistic) packet */
599 if (spnego_state->state_position == SPNEGO_CLIENT_START) {
600 nt_status = gensec_update(spnego_state->sub_sec_security,
601 out_mem_ctx,
602 null_data_blob,
603 &unwrapped_out);
604
605 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
606 && !NT_STATUS_IS_OK(nt_status)) {
607 DEBUG(1, ("SPNEGO(%s) creating NEG_TOKEN_INIT failed: %s\n",
608 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
609 talloc_free(spnego_state->sub_sec_security);
610 spnego_state->sub_sec_security = NULL;
611 /* Pretend we never started it (lets the first run find some incompatible demand) */
612
613 continue;
614 }
615 }
616
617 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
618
619 send_mech_types = gensec_security_oids_from_ops_wrapped(out_mem_ctx,
620 &all_sec[i]);
621
622 ok = spnego_write_mech_types(spnego_state,
623 send_mech_types,
624 &spnego_state->mech_types);
625 if (!ok) {
626 DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
627 return NT_STATUS_NO_MEMORY;
628 }
629
630 /* List the remaining mechs as options */
631 spnego_out.negTokenInit.mechTypes = send_mech_types;
632 spnego_out.negTokenInit.reqFlags = null_data_blob;
633 spnego_out.negTokenInit.reqFlagsPadding = 0;
634
635 if (spnego_state->state_position == SPNEGO_SERVER_START) {
636 /* server credentials */
637 struct cli_credentials *creds = gensec_get_credentials(gensec_security);
638 if (creds) {
639 principal = cli_credentials_get_principal(creds, out_mem_ctx);
640 }
641 }
642 if (principal) {
643 spnego_out.negTokenInit.mechListMIC
644 = data_blob_string_const(principal);
645 } else {
646 spnego_out.negTokenInit.mechListMIC = null_data_blob;
647 }
648
649 spnego_out.negTokenInit.mechToken = unwrapped_out;
650
651 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
652 DEBUG(1, ("Failed to write NEG_TOKEN_INIT\n"));
653 return NT_STATUS_INVALID_PARAMETER;
654 }
655
656 /* set next state */
657 spnego_state->neg_oid = all_sec[i].oid;
658
659 if (NT_STATUS_IS_OK(nt_status)) {
660 spnego_state->no_response_expected = true;
661 }
662
663 return NT_STATUS_MORE_PROCESSING_REQUIRED;
664 }
665 talloc_free(spnego_state->sub_sec_security);
666 spnego_state->sub_sec_security = NULL;
667
668 DEBUG(1, ("Failed to setup SPNEGO negTokenInit request: %s\n", nt_errstr(nt_status)));
669 return NT_STATUS_INVALID_PARAMETER;
670 }
671
672
673 /** create a server negTokenTarg
674 *
675 * This is the case, where the client is the first one who sends data
676 */
677
678 static NTSTATUS gensec_spnego_server_negTokenTarg(struct gensec_security *gensec_security,
679 struct spnego_state *spnego_state,
680 TALLOC_CTX *out_mem_ctx,
681 NTSTATUS nt_status,
682 const DATA_BLOB unwrapped_out,
683 DATA_BLOB mech_list_mic,
684 DATA_BLOB *out)
685 {
686 struct spnego_data spnego_out;
687 DATA_BLOB null_data_blob = data_blob(NULL, 0);
688
689 /* compose reply */
690 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
691 spnego_out.negTokenTarg.responseToken = unwrapped_out;
692 spnego_out.negTokenTarg.mechListMIC = null_data_blob;
693 spnego_out.negTokenTarg.supportedMech = NULL;
694
695 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
696 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
697 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
698 spnego_state->state_position = SPNEGO_SERVER_TARG;
699 } else if (NT_STATUS_IS_OK(nt_status)) {
700 if (unwrapped_out.data) {
701 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
702 }
703 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
704 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
705 spnego_state->state_position = SPNEGO_DONE;
706 } else {
707 spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
708 DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
709 spnego_state->state_position = SPNEGO_DONE;
710 }
711
712 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
713 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
714 return NT_STATUS_INVALID_PARAMETER;
715 }
716
717 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
718
719 return nt_status;
720 }
721
722
723 static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
724 const DATA_BLOB in, DATA_BLOB *out)
725 {
726 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
727 DATA_BLOB null_data_blob = data_blob(NULL, 0);
728 DATA_BLOB mech_list_mic = data_blob(NULL, 0);
729 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
730 struct spnego_data spnego_out;
731 struct spnego_data spnego;
732
733 ssize_t len;
734
735 *out = data_blob(NULL, 0);
736
737 if (!out_mem_ctx) {
738 out_mem_ctx = spnego_state;
739 }
740
741 /* and switch into the state machine */
742
743 switch (spnego_state->state_position) {
744 case SPNEGO_FALLBACK:
745 return gensec_update(spnego_state->sub_sec_security,
746 out_mem_ctx, in, out);
747 case SPNEGO_SERVER_START:
748 {
749 NTSTATUS nt_status;
750 if (in.length) {
751
752 len = spnego_read_data(gensec_security, in, &spnego);
753 if (len == -1) {
754 return gensec_spnego_server_try_fallback(gensec_security, spnego_state,
755 out_mem_ctx, in, out);
756 }
757 /* client sent NegTargetInit, we send NegTokenTarg */
758
759 /* OK, so it's real SPNEGO, check the packet's the one we expect */
760 if (spnego.type != spnego_state->expected_packet) {
761 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
762 spnego_state->expected_packet));
763 dump_data(1, in.data, in.length);
764 spnego_free_data(&spnego);
765 return NT_STATUS_INVALID_PARAMETER;
766 }
767
768 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
769 spnego_state,
770 out_mem_ctx,
771 spnego.negTokenInit.mechTypes,
772 spnego.negTokenInit.mechToken,
773 &unwrapped_out);
774
775 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
776 spnego_state,
777 out_mem_ctx,
778 nt_status,
779 unwrapped_out,
780 null_data_blob,
781 out);
782
783 spnego_free_data(&spnego);
784
785 return nt_status;
786 } else {
787 nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
788 out_mem_ctx, in, out);
789 spnego_state->state_position = SPNEGO_SERVER_START;
790 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
791 return nt_status;
792 }
793 }
794
795 case SPNEGO_CLIENT_START:
796 {
797 /* The server offers a list of mechanisms */
798
799 const char *my_mechs[] = {NULL, NULL};
800 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
801
802 if (!in.length) {
803 /* client to produce negTokenInit */
804 nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
805 out_mem_ctx, in, out);
806 spnego_state->state_position = SPNEGO_CLIENT_TARG;
807 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
808 return nt_status;
809 }
810
811 len = spnego_read_data(gensec_security, in, &spnego);
812
813 if (len == -1) {
814 DEBUG(1, ("Invalid SPNEGO request:\n"));
815 dump_data(1, in.data, in.length);
816 return NT_STATUS_INVALID_PARAMETER;
817 }
818
819 /* OK, so it's real SPNEGO, check the packet's the one we expect */
820 if (spnego.type != spnego_state->expected_packet) {
821 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
822 spnego_state->expected_packet));
823 dump_data(1, in.data, in.length);
824 spnego_free_data(&spnego);
825 return NT_STATUS_INVALID_PARAMETER;
826 }
827
828 if (spnego.negTokenInit.targetPrincipal) {
829 DEBUG(5, ("Server claims it's principal name is %s\n", spnego.negTokenInit.targetPrincipal));
830 if (lpcfg_client_use_spnego_principal(gensec_security->settings->lp_ctx)) {
831 gensec_set_target_principal(gensec_security, spnego.negTokenInit.targetPrincipal);
832 }
833 }
834
835 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
836 spnego_state,
837 out_mem_ctx,
838 spnego.negTokenInit.mechTypes,
839 spnego.negTokenInit.mechToken,
840 &unwrapped_out);
841
842 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
843 spnego_free_data(&spnego);
844 return nt_status;
845 }
846
847 my_mechs[0] = spnego_state->neg_oid;
848 /* compose reply */
849 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
850 spnego_out.negTokenInit.mechTypes = my_mechs;
851 spnego_out.negTokenInit.reqFlags = null_data_blob;
852 spnego_out.negTokenInit.reqFlagsPadding = 0;
853 spnego_out.negTokenInit.mechListMIC = null_data_blob;
854 spnego_out.negTokenInit.mechToken = unwrapped_out;
855
856 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
857 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
858 return NT_STATUS_INVALID_PARAMETER;
859 }
860
861 /* set next state */
862 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
863 spnego_state->state_position = SPNEGO_CLIENT_TARG;
864
865 if (NT_STATUS_IS_OK(nt_status)) {
866 spnego_state->no_response_expected = true;
867 }
868
869 spnego_free_data(&spnego);
870 return NT_STATUS_MORE_PROCESSING_REQUIRED;
871 }
872 case SPNEGO_SERVER_TARG:
873 {
874 NTSTATUS nt_status;
875 bool new_spnego = false;
876
877 if (!in.length) {
878 return NT_STATUS_INVALID_PARAMETER;
879 }
880
881 len = spnego_read_data(gensec_security, in, &spnego);
882
883 if (len == -1) {
884 DEBUG(1, ("Invalid SPNEGO request:\n"));
885 dump_data(1, in.data, in.length);
886 return NT_STATUS_INVALID_PARAMETER;
887 }
888
889 /* OK, so it's real SPNEGO, check the packet's the one we expect */
890 if (spnego.type != spnego_state->expected_packet) {
891 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
892 spnego_state->expected_packet));
893 dump_data(1, in.data, in.length);
894 spnego_free_data(&spnego);
895 return NT_STATUS_INVALID_PARAMETER;
896 }
897
898 if (!spnego_state->sub_sec_security) {
899 DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
900 spnego_free_data(&spnego);
901 return NT_STATUS_INVALID_PARAMETER;
902 }
903
904 nt_status = gensec_update(spnego_state->sub_sec_security,
905 out_mem_ctx,
906 spnego.negTokenTarg.responseToken,
907 &unwrapped_out);
908 if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
909 new_spnego = true;
910 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
911 out_mem_ctx,
912 spnego_state->mech_types.data,
913 spnego_state->mech_types.length,
914 spnego_state->mech_types.data,
915 spnego_state->mech_types.length,
916 &spnego.negTokenTarg.mechListMIC);
917 if (!NT_STATUS_IS_OK(nt_status)) {
918 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
919 nt_errstr(nt_status)));
920 }
921 }
922 if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
923 nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
924 out_mem_ctx,
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 &mech_list_mic);
930 if (!NT_STATUS_IS_OK(nt_status)) {
931 DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
932 nt_errstr(nt_status)));
933 }
934 }
935
936 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
937 spnego_state,
938 out_mem_ctx,
939 nt_status,
940 unwrapped_out,
941 mech_list_mic,
942 out);
943
944 spnego_free_data(&spnego);
945
946 return nt_status;
947 }
948 case SPNEGO_CLIENT_TARG:
949 {
950 NTSTATUS nt_status;
951 if (!in.length) {
952 return NT_STATUS_INVALID_PARAMETER;
953 }
954
955 len = spnego_read_data(gensec_security, in, &spnego);
956
957 if (len == -1) {
958 DEBUG(1, ("Invalid SPNEGO request:\n"));
959 dump_data(1, in.data, in.length);
960 return NT_STATUS_INVALID_PARAMETER;
961 }
962
963 /* OK, so it's real SPNEGO, check the packet's the one we expect */
964 if (spnego.type != spnego_state->expected_packet) {
965 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
966 spnego_state->expected_packet));
967 dump_data(1, in.data, in.length);
968 spnego_free_data(&spnego);
969 return NT_STATUS_INVALID_PARAMETER;
970 }
971
972 if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
973 spnego_free_data(&spnego);
974 return NT_STATUS_ACCESS_DENIED;
975 }
976
977 /* Server didn't like our choice of mech, and chose something else */
978 if ((spnego.negTokenTarg.negResult == SPNEGO_ACCEPT_INCOMPLETE) &&
979 spnego.negTokenTarg.supportedMech &&
980 strcmp(spnego.negTokenTarg.supportedMech, spnego_state->neg_oid) != 0) {
981 DEBUG(3,("GENSEC SPNEGO: client preferred mech (%s) not accepted, server wants: %s\n",
982 gensec_get_name_by_oid(gensec_security, spnego.negTokenTarg.supportedMech),
983 gensec_get_name_by_oid(gensec_security, spnego_state->neg_oid)));
984
985 talloc_free(spnego_state->sub_sec_security);
986 nt_status = gensec_subcontext_start(spnego_state,
987 gensec_security,
988 &spnego_state->sub_sec_security);
989 if (!NT_STATUS_IS_OK(nt_status)) {
990 spnego_free_data(&spnego);
991 return nt_status;
992 }
993 /* select the sub context */
994 nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
995 spnego.negTokenTarg.supportedMech);
996 if (!NT_STATUS_IS_OK(nt_status)) {
997 spnego_free_data(&spnego);
998 return nt_status;
999 }
1000
1001 nt_status = gensec_update(spnego_state->sub_sec_security,
1002 out_mem_ctx,
1003 spnego.negTokenTarg.responseToken,
1004 &unwrapped_out);
1005 spnego_state->neg_oid = talloc_strdup(spnego_state, spnego.negTokenTarg.supportedMech);
1006 } else if (spnego_state->no_response_expected) {
1007 if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1008 DEBUG(3,("GENSEC SPNEGO: client GENSEC accepted, but server rejected (bad password?)\n"));
1009 nt_status = NT_STATUS_INVALID_PARAMETER;
1010 } else if (spnego.negTokenTarg.responseToken.length) {
1011 DEBUG(2,("GENSEC SPNEGO: client GENSEC accepted, but server continued negotiation!\n"));
1012 nt_status = NT_STATUS_INVALID_PARAMETER;
1013 } else {
1014 nt_status = NT_STATUS_OK;
1015 }
1016 if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
1017 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
1018 out_mem_ctx,
1019 spnego_state->mech_types.data,
1020 spnego_state->mech_types.length,
1021 spnego_state->mech_types.data,
1022 spnego_state->mech_types.length,
1023 &spnego.negTokenTarg.mechListMIC);
1024 if (!NT_STATUS_IS_OK(nt_status)) {
1025 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
1026 nt_errstr(nt_status)));
1027 }
1028 }
1029 } else {
1030 bool new_spnego = false;
1031
1032 nt_status = gensec_update(spnego_state->sub_sec_security,
1033 out_mem_ctx,
1034 spnego.negTokenTarg.responseToken,
1035 &unwrapped_out);
1036
1037 if (NT_STATUS_IS_OK(nt_status)
1038 && spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1039 new_spnego = gensec_have_feature(spnego_state->sub_sec_security,
1040 GENSEC_FEATURE_NEW_SPNEGO);
1041 }
1042 if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
1043 nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
1044 out_mem_ctx,
1045 spnego_state->mech_types.data,
1046 spnego_state->mech_types.length,
1047 spnego_state->mech_types.data,
1048 spnego_state->mech_types.length,
1049 &mech_list_mic);
1050 if (!NT_STATUS_IS_OK(nt_status)) {
1051 DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
1052 nt_errstr(nt_status)));
1053 }
1054 }
1055 if (NT_STATUS_IS_OK(nt_status)) {
1056 spnego_state->no_response_expected = true;
1057 }
1058 }
1059
1060 spnego_free_data(&spnego);
1061
1062 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
1063 && !NT_STATUS_IS_OK(nt_status)) {
1064 DEBUG(1, ("SPNEGO(%s) login failed: %s\n",
1065 spnego_state->sub_sec_security->ops->name,
1066 nt_errstr(nt_status)));
1067 return nt_status;
1068 }
1069
1070 if (unwrapped_out.length || mech_list_mic.length) {
1071 /* compose reply */
1072 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
1073 spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
1074 spnego_out.negTokenTarg.supportedMech = NULL;
1075 spnego_out.negTokenTarg.responseToken = unwrapped_out;
1076 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
1077
1078 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
1079 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
1080 return NT_STATUS_INVALID_PARAMETER;
1081 }
1082
1083 spnego_state->state_position = SPNEGO_CLIENT_TARG;
1084 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
1085 } else {
1086
1087 /* all done - server has accepted, and we agree */
1088 *out = null_data_blob;
1089
1090 if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1091 /* unless of course it did not accept */
1092 DEBUG(1,("gensec_update ok but not accepted\n"));
1093 nt_status = NT_STATUS_INVALID_PARAMETER;
1094 }
1095
1096 spnego_state->state_position = SPNEGO_DONE;
1097 }
1098
1099 return nt_status;
1100 }
1101 case SPNEGO_DONE:
1102 /* We should not be called after we are 'done' */
1103 return NT_STATUS_INVALID_PARAMETER;
1104 }
1105 return NT_STATUS_INVALID_PARAMETER;
1106 }
1107
1108 static void gensec_spnego_want_feature(struct gensec_security *gensec_security,
1109 uint32_t feature)
1110 {
1111 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1112
1113 if (!spnego_state || !spnego_state->sub_sec_security) {
1114 gensec_security->want_features |= feature;
1115 return;
1116 }
1117
1118 gensec_want_feature(spnego_state->sub_sec_security,
1119 feature);
1120 }
1121
1122 static bool gensec_spnego_have_feature(struct gensec_security *gensec_security,
1123 uint32_t feature)
1124 {
1125 struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1126 if (!spnego_state->sub_sec_security) {
1127 return false;
1128 }
1129
1130 return gensec_have_feature(spnego_state->sub_sec_security,
1131 feature);
1132 }
1133
1134 static const char *gensec_spnego_oids[] = {
1135 GENSEC_OID_SPNEGO,
1136 NULL
1137 };
1138
1139 static const struct gensec_security_ops gensec_spnego_security_ops = {
1140 .name = "spnego",
1141 .sasl_name = "GSS-SPNEGO",
1142 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1143 .oid = gensec_spnego_oids,
1144 .client_start = gensec_spnego_client_start,
1145 .server_start = gensec_spnego_server_start,
1146 .update = gensec_spnego_update,
1147 .seal_packet = gensec_spnego_seal_packet,
1148 .sign_packet = gensec_spnego_sign_packet,
1149 .sig_size = gensec_spnego_sig_size,
1150 .max_wrapped_size = gensec_spnego_max_wrapped_size,
1151 .max_input_size = gensec_spnego_max_input_size,
1152 .check_packet = gensec_spnego_check_packet,
1153 .unseal_packet = gensec_spnego_unseal_packet,
1154 .packet_full_request = gensec_spnego_packet_full_request,
1155 .wrap = gensec_spnego_wrap,
1156 .unwrap = gensec_spnego_unwrap,
1157 .wrap_packets = gensec_spnego_wrap_packets,
1158 .unwrap_packets = gensec_spnego_unwrap_packets,
1159 .session_key = gensec_spnego_session_key,
1160 .session_info = gensec_spnego_session_info,
1161 .want_feature = gensec_spnego_want_feature,
1162 .have_feature = gensec_spnego_have_feature,
1163 .enabled = true,
1164 .priority = GENSEC_SPNEGO
1165 };
1166
1167 _PUBLIC_ NTSTATUS gensec_spnego_init(void)
1168 {
1169 NTSTATUS ret;
1170 ret = gensec_register(&gensec_spnego_security_ops);
1171 if (!NT_STATUS_IS_OK(ret)) {
1172 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1173 gensec_spnego_security_ops.name));
1174 return ret;
1175 }
1176
1177 return ret;
1178 }
reg import