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r22293: Try to make it more clear what failed to parse.
[Samba.git] / source / auth / gensec / spnego.c
blob243f239d5d24db11e3ac7e03abf7f2f0afbd59ea
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
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
25 #include "includes.h"
26 #include "auth/gensec/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/socket.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
50
51 static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_security)
52 {
53 struct spnego_state *spnego_state;
54
55 spnego_state = talloc(gensec_security, struct spnego_state);
56 if (!spnego_state) {
57 return NT_STATUS_NO_MEMORY;
58 }
59
60 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
61 spnego_state->state_position = SPNEGO_CLIENT_START;
62 spnego_state->sub_sec_security = NULL;
63 spnego_state->no_response_expected = False;
64
65 gensec_security->private_data = spnego_state;
66 return NT_STATUS_OK;
67 }
68
69 static NTSTATUS gensec_spnego_server_start(struct gensec_security *gensec_security)
70 {
71 struct spnego_state *spnego_state;
72
73 spnego_state = talloc(gensec_security, struct spnego_state);
74 if (!spnego_state) {
75 return NT_STATUS_NO_MEMORY;
76 }
77
78 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
79 spnego_state->state_position = SPNEGO_SERVER_START;
80 spnego_state->sub_sec_security = NULL;
81 spnego_state->no_response_expected = False;
82
83 gensec_security->private_data = spnego_state;
84 return NT_STATUS_OK;
85 }
86
87 /*
88 wrappers for the spnego_*() functions
89 */
90 static NTSTATUS gensec_spnego_unseal_packet(struct gensec_security *gensec_security,
91 TALLOC_CTX *mem_ctx,
92 uint8_t *data, size_t length,
93 const uint8_t *whole_pdu, size_t pdu_length,
94 const DATA_BLOB *sig)
95 {
96 struct spnego_state *spnego_state = gensec_security->private_data;
97
98 if (spnego_state->state_position != SPNEGO_DONE
99 && spnego_state->state_position != SPNEGO_FALLBACK) {
100 return NT_STATUS_INVALID_PARAMETER;
101 }
102
103 return gensec_unseal_packet(spnego_state->sub_sec_security,
104 mem_ctx,
105 data, length,
106 whole_pdu, pdu_length,
107 sig);
108 }
109
110 static NTSTATUS gensec_spnego_check_packet(struct gensec_security *gensec_security,
111 TALLOC_CTX *mem_ctx,
112 const uint8_t *data, size_t length,
113 const uint8_t *whole_pdu, size_t pdu_length,
114 const DATA_BLOB *sig)
115 {
116 struct spnego_state *spnego_state = gensec_security->private_data;
117
118 if (spnego_state->state_position != SPNEGO_DONE
119 && spnego_state->state_position != SPNEGO_FALLBACK) {
120 return NT_STATUS_INVALID_PARAMETER;
121 }
122
123 return gensec_check_packet(spnego_state->sub_sec_security,
124 mem_ctx,
125 data, length,
126 whole_pdu, pdu_length,
127 sig);
128 }
129
130 static NTSTATUS gensec_spnego_seal_packet(struct gensec_security *gensec_security,
131 TALLOC_CTX *mem_ctx,
132 uint8_t *data, size_t length,
133 const uint8_t *whole_pdu, size_t pdu_length,
134 DATA_BLOB *sig)
135 {
136 struct spnego_state *spnego_state = gensec_security->private_data;
137
138 if (spnego_state->state_position != SPNEGO_DONE
139 && spnego_state->state_position != SPNEGO_FALLBACK) {
140 return NT_STATUS_INVALID_PARAMETER;
141 }
142
143 return gensec_seal_packet(spnego_state->sub_sec_security,
144 mem_ctx,
145 data, length,
146 whole_pdu, pdu_length,
147 sig);
148 }
149
150 static NTSTATUS gensec_spnego_sign_packet(struct gensec_security *gensec_security,
151 TALLOC_CTX *mem_ctx,
152 const uint8_t *data, size_t length,
153 const uint8_t *whole_pdu, size_t pdu_length,
154 DATA_BLOB *sig)
155 {
156 struct spnego_state *spnego_state = gensec_security->private_data;
157
158 if (spnego_state->state_position != SPNEGO_DONE
159 && spnego_state->state_position != SPNEGO_FALLBACK) {
160 return NT_STATUS_INVALID_PARAMETER;
161 }
162
163 return gensec_sign_packet(spnego_state->sub_sec_security,
164 mem_ctx,
165 data, length,
166 whole_pdu, pdu_length,
167 sig);
168 }
169
170 static NTSTATUS gensec_spnego_wrap(struct gensec_security *gensec_security,
171 TALLOC_CTX *mem_ctx,
172 const DATA_BLOB *in,
173 DATA_BLOB *out)
174 {
175 struct spnego_state *spnego_state = gensec_security->private_data;
176
177 if (spnego_state->state_position != SPNEGO_DONE
178 && spnego_state->state_position != SPNEGO_FALLBACK) {
179 DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
180 return NT_STATUS_INVALID_PARAMETER;
181 }
182
183 return gensec_wrap(spnego_state->sub_sec_security,
184 mem_ctx, in, out);
185 }
186
187 static NTSTATUS gensec_spnego_unwrap(struct gensec_security *gensec_security,
188 TALLOC_CTX *mem_ctx,
189 const DATA_BLOB *in,
190 DATA_BLOB *out)
191 {
192 struct spnego_state *spnego_state = gensec_security->private_data;
193
194 if (spnego_state->state_position != SPNEGO_DONE
195 && spnego_state->state_position != SPNEGO_FALLBACK) {
196 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
197 return NT_STATUS_INVALID_PARAMETER;
198 }
199
200 return gensec_unwrap(spnego_state->sub_sec_security,
201 mem_ctx, in, out);
202 }
203
204 static NTSTATUS gensec_spnego_wrap_packets(struct gensec_security *gensec_security,
205 TALLOC_CTX *mem_ctx,
206 const DATA_BLOB *in,
207 DATA_BLOB *out,
208 size_t *len_processed)
209 {
210 struct spnego_state *spnego_state = gensec_security->private_data;
211
212 if (spnego_state->state_position != SPNEGO_DONE
213 && spnego_state->state_position != SPNEGO_FALLBACK) {
214 DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
215 return NT_STATUS_INVALID_PARAMETER;
216 }
217
218 return gensec_wrap_packets(spnego_state->sub_sec_security,
219 mem_ctx, in, out,
220 len_processed);
221 }
222
223 static NTSTATUS gensec_spnego_packet_full_request(struct gensec_security *gensec_security,
224 DATA_BLOB blob, size_t *size)
225 {
226 struct spnego_state *spnego_state = gensec_security->private_data;
227
228 if (spnego_state->state_position != SPNEGO_DONE
229 && spnego_state->state_position != SPNEGO_FALLBACK) {
230 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
231 return NT_STATUS_INVALID_PARAMETER;
232 }
233
234 return gensec_packet_full_request(spnego_state->sub_sec_security,
235 blob, size);
236 }
237
238 static NTSTATUS gensec_spnego_unwrap_packets(struct gensec_security *gensec_security,
239 TALLOC_CTX *mem_ctx,
240 const DATA_BLOB *in,
241 DATA_BLOB *out,
242 size_t *len_processed)
243 {
244 struct spnego_state *spnego_state = gensec_security->private_data;
245
246 if (spnego_state->state_position != SPNEGO_DONE
247 && spnego_state->state_position != SPNEGO_FALLBACK) {
248 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
249 return NT_STATUS_INVALID_PARAMETER;
250 }
251
252 return gensec_unwrap_packets(spnego_state->sub_sec_security,
253 mem_ctx, in, out,
254 len_processed);
255 }
256
257 static size_t gensec_spnego_sig_size(struct gensec_security *gensec_security, size_t data_size)
258 {
259 struct spnego_state *spnego_state = gensec_security->private_data;
260
261 if (spnego_state->state_position != SPNEGO_DONE
262 && spnego_state->state_position != SPNEGO_FALLBACK) {
263 return 0;
264 }
265
266 return gensec_sig_size(spnego_state->sub_sec_security, data_size);
267 }
268
269 static size_t gensec_spnego_max_input_size(struct gensec_security *gensec_security)
270 {
271 struct spnego_state *spnego_state = gensec_security->private_data;
272
273 if (spnego_state->state_position != SPNEGO_DONE
274 && spnego_state->state_position != SPNEGO_FALLBACK) {
275 return 0;
276 }
277
278 return gensec_max_input_size(spnego_state->sub_sec_security);
279 }
280
281 static size_t gensec_spnego_max_wrapped_size(struct gensec_security *gensec_security)
282 {
283 struct spnego_state *spnego_state = gensec_security->private_data;
284
285 if (spnego_state->state_position != SPNEGO_DONE
286 && spnego_state->state_position != SPNEGO_FALLBACK) {
287 return 0;
288 }
289
290 return gensec_max_wrapped_size(spnego_state->sub_sec_security);
291 }
292
293 static NTSTATUS gensec_spnego_session_key(struct gensec_security *gensec_security,
294 DATA_BLOB *session_key)
295 {
296 struct spnego_state *spnego_state = gensec_security->private_data;
297 if (!spnego_state->sub_sec_security) {
298 return NT_STATUS_INVALID_PARAMETER;
299 }
300
301 return gensec_session_key(spnego_state->sub_sec_security,
302 session_key);
303 }
304
305 static NTSTATUS gensec_spnego_session_info(struct gensec_security *gensec_security,
306 struct auth_session_info **session_info)
307 {
308 struct spnego_state *spnego_state = gensec_security->private_data;
309 if (!spnego_state->sub_sec_security) {
310 return NT_STATUS_INVALID_PARAMETER;
311 }
312
313 return gensec_session_info(spnego_state->sub_sec_security,
314 session_info);
315 }
316
317 /** Fallback to another GENSEC mechanism, based on magic strings
318 *
319 * This is the 'fallback' case, where we don't get SPNEGO, and have to
320 * try all the other options (and hope they all have a magic string
321 * they check)
322 */
323
324 static NTSTATUS gensec_spnego_server_try_fallback(struct gensec_security *gensec_security,
325 struct spnego_state *spnego_state,
326 TALLOC_CTX *out_mem_ctx,
327 const DATA_BLOB in, DATA_BLOB *out)
328 {
329 int i,j;
330 struct gensec_security_ops **all_ops
331 = gensec_security_mechs(gensec_security, out_mem_ctx);
332 for (i=0; all_ops[i]; i++) {
333 BOOL is_spnego;
334 NTSTATUS nt_status;
335 if (!all_ops[i]->oid) {
336 continue;
337 }
338
339 is_spnego = False;
340 for (j=0; all_ops[i]->oid[j]; j++) {
341 if (strcasecmp(GENSEC_OID_SPNEGO,all_ops[i]->oid[j]) == 0) {
342 is_spnego = True;
343 }
344 }
345 if (is_spnego) {
346 continue;
347 }
348
349 if (!all_ops[i]->magic) {
350 continue;
351 }
352
353 nt_status = all_ops[i]->magic(gensec_security, &in);
354 if (!NT_STATUS_IS_OK(nt_status)) {
355 continue;
356 }
357
358 spnego_state->state_position = SPNEGO_FALLBACK;
359
360 nt_status = gensec_subcontext_start(spnego_state,
361 gensec_security,
362 &spnego_state->sub_sec_security);
363
364 if (!NT_STATUS_IS_OK(nt_status)) {
365 return nt_status;
366 }
367 /* select the sub context */
368 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
369 all_ops[i]);
370 if (!NT_STATUS_IS_OK(nt_status)) {
371 return nt_status;
372 }
373 nt_status = gensec_update(spnego_state->sub_sec_security,
374 out_mem_ctx, in, out);
375 return nt_status;
376 }
377 DEBUG(1, ("Failed to parse SPNEGO request\n"));
378 return NT_STATUS_INVALID_PARAMETER;
379
380 }
381
382 /*
383 Parse the netTokenInit, either from the client, to the server, or
384 from the server to the client.
385 */
386
387 static NTSTATUS gensec_spnego_parse_negTokenInit(struct gensec_security *gensec_security,
388 struct spnego_state *spnego_state,
389 TALLOC_CTX *out_mem_ctx,
390 const char **mechType,
391 const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out)
392 {
393 int i;
394 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
395 DATA_BLOB null_data_blob = data_blob(NULL,0);
396
397 const struct gensec_security_ops_wrapper *all_sec
398 = gensec_security_by_oid_list(gensec_security,
399 out_mem_ctx,
400 mechType,
401 GENSEC_OID_SPNEGO);
402 if (spnego_state->state_position == SPNEGO_SERVER_START) {
403 for (i=0; all_sec && all_sec[i].op; i++) {
404 /* optomisitic token */
405 if (strcmp(all_sec[i].oid, mechType[0]) == 0) {
406 nt_status = gensec_subcontext_start(spnego_state,
407 gensec_security,
408 &spnego_state->sub_sec_security);
409 if (!NT_STATUS_IS_OK(nt_status)) {
410 return nt_status;
411 }
412 /* select the sub context */
413 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
414 all_sec[i].op);
415 if (!NT_STATUS_IS_OK(nt_status)) {
416 talloc_free(spnego_state->sub_sec_security);
417 spnego_state->sub_sec_security = NULL;
418 break;
419 }
420
421 nt_status = gensec_update(spnego_state->sub_sec_security,
422 out_mem_ctx,
423 unwrapped_in,
424 unwrapped_out);
425 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
426 NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
427 /* Pretend we never started it (lets the first run find some incompatible demand) */
428
429 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse contents: %s\n",
430 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
431 talloc_free(spnego_state->sub_sec_security);
432 spnego_state->sub_sec_security = NULL;
433 break;
434 }
435
436 spnego_state->neg_oid = all_sec[i].oid;
437 break;
438 }
439 }
440 }
441
442 /* Having tried any optomisitc token from the client (if we
443 * were the server), if we didn't get anywhere, walk our list
444 * in our preference order */
445
446 if (!spnego_state->sub_sec_security) {
447 for (i=0; all_sec && all_sec[i].op; i++) {
448 nt_status = gensec_subcontext_start(spnego_state,
449 gensec_security,
450 &spnego_state->sub_sec_security);
451 if (!NT_STATUS_IS_OK(nt_status)) {
452 return nt_status;
453 }
454 /* select the sub context */
455 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
456 all_sec[i].op);
457 if (!NT_STATUS_IS_OK(nt_status)) {
458 talloc_free(spnego_state->sub_sec_security);
459 spnego_state->sub_sec_security = NULL;
460 continue;
461 }
462
463 spnego_state->neg_oid = all_sec[i].oid;
464
465 /* only get the helping start blob for the first OID */
466 nt_status = gensec_update(spnego_state->sub_sec_security,
467 out_mem_ctx,
468 null_data_blob,
469 unwrapped_out);
470
471 /* it is likely that a NULL input token will
472 * not be liked by most server mechs, but if
473 * we are in the client, we want the first
474 * update packet to be able to abort the use
475 * of this mech */
476 if (spnego_state->state_position != SPNEGO_SERVER_START) {
477 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
478 NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
479 /* Pretend we never started it (lets the first run find some incompatible demand) */
480
481 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse: %s\n",
482 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
483 talloc_free(spnego_state->sub_sec_security);
484 spnego_state->sub_sec_security = NULL;
485 continue;
486 }
487 }
488
489 break;
490 }
491 }
492
493 if (spnego_state->sub_sec_security) {
494 /* it is likely that a NULL input token will
495 * not be liked by most server mechs, but this
496 * does the right thing in the CIFS client.
497 * just push us along the merry-go-round
498 * again, and hope for better luck next
499 * time */
500
501 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
502 *unwrapped_out = data_blob(NULL, 0);
503 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
504 }
505
506 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)
507 && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
508 && !NT_STATUS_IS_OK(nt_status)) {
509 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
510 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
511 talloc_free(spnego_state->sub_sec_security);
512 spnego_state->sub_sec_security = NULL;
513
514 /* We started the mech correctly, and the
515 * input from the other side was valid.
516 * Return the error (say bad password, invalid
517 * ticket) */
518 return nt_status;
519 }
520
521
522 return nt_status; /* OK, INVALID_PARAMETER ore MORE PROCESSING */
523 }
524
525 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
526 /* we could re-negotiate here, but it would only work
527 * if the client or server lied about what it could
528 * support the first time. Lets keep this code to
529 * reality */
530
531 return NT_STATUS_INVALID_PARAMETER;
532 }
533
534 /** create a negTokenInit
535 *
536 * This is the same packet, no matter if the client or server sends it first, but it is always the first packet
537 */
538 static NTSTATUS gensec_spnego_create_negTokenInit(struct gensec_security *gensec_security,
539 struct spnego_state *spnego_state,
540 TALLOC_CTX *out_mem_ctx,
541 const DATA_BLOB in, DATA_BLOB *out)
542 {
543 int i;
544 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
545 DATA_BLOB null_data_blob = data_blob(NULL,0);
546 const char **mechTypes = NULL;
547 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
548 const struct gensec_security_ops_wrapper *all_sec;
549 const char *principal = NULL;
550
551 mechTypes = gensec_security_oids(gensec_security,
552 out_mem_ctx, GENSEC_OID_SPNEGO);
553
554 all_sec = gensec_security_by_oid_list(gensec_security,
555 out_mem_ctx,
556 mechTypes,
557 GENSEC_OID_SPNEGO);
558 for (i=0; all_sec && all_sec[i].op; i++) {
559 struct spnego_data spnego_out;
560 nt_status = gensec_subcontext_start(spnego_state,
561 gensec_security,
562 &spnego_state->sub_sec_security);
563 if (!NT_STATUS_IS_OK(nt_status)) {
564 return nt_status;
565 }
566 /* select the sub context */
567 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
568 all_sec[i].op);
569 if (!NT_STATUS_IS_OK(nt_status)) {
570 talloc_free(spnego_state->sub_sec_security);
571 spnego_state->sub_sec_security = NULL;
572 continue;
573 }
574
575 /* In the client, try and produce the first (optimistic) packet */
576 if (spnego_state->state_position == SPNEGO_CLIENT_START) {
577 nt_status = gensec_update(spnego_state->sub_sec_security,
578 out_mem_ctx,
579 null_data_blob,
580 &unwrapped_out);
581
582 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
583 && !NT_STATUS_IS_OK(nt_status)) {
584 DEBUG(1, ("SPNEGO(%s) creating NEG_TOKEN_INIT failed: %s\n",
585 spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
586 talloc_free(spnego_state->sub_sec_security);
587 spnego_state->sub_sec_security = NULL;
588 /* Pretend we never started it (lets the first run find some incompatible demand) */
589
590 continue;
591 }
592 }
593
594 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
595
596 /* List the remaining mechs as options */
597 spnego_out.negTokenInit.mechTypes = gensec_security_oids_from_ops_wrapped(out_mem_ctx,
598 &all_sec[i]);
599 spnego_out.negTokenInit.reqFlags = 0;
600
601 if (spnego_state->state_position == SPNEGO_SERVER_START) {
602 /* server credentails */
603 struct cli_credentials *creds = gensec_get_credentials(gensec_security);
604 if (creds) {
605 principal = cli_credentials_get_principal(creds, out_mem_ctx);
606 }
607 }
608 if (principal) {
609 spnego_out.negTokenInit.mechListMIC
610 = data_blob_string_const(principal);
611 } else {
612 spnego_out.negTokenInit.mechListMIC = null_data_blob;
613 }
614
615 spnego_out.negTokenInit.mechToken = unwrapped_out;
616
617 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
618 DEBUG(1, ("Failed to write NEG_TOKEN_INIT\n"));
619 return NT_STATUS_INVALID_PARAMETER;
620 }
621
622 /* set next state */
623 spnego_state->neg_oid = all_sec[i].oid;
624
625 if (NT_STATUS_IS_OK(nt_status)) {
626 spnego_state->no_response_expected = True;
627 }
628
629 return NT_STATUS_MORE_PROCESSING_REQUIRED;
630 }
631 talloc_free(spnego_state->sub_sec_security);
632 spnego_state->sub_sec_security = NULL;
633
634 DEBUG(1, ("Failed to setup SPNEGO negTokenInit request: %s\n", nt_errstr(nt_status)));
635 return NT_STATUS_INVALID_PARAMETER;
636 }
637
638
639 /** create a server negTokenTarg
640 *
641 * This is the case, where the client is the first one who sends data
642 */
643
644 static NTSTATUS gensec_spnego_server_negTokenTarg(struct gensec_security *gensec_security,
645 struct spnego_state *spnego_state,
646 TALLOC_CTX *out_mem_ctx,
647 NTSTATUS nt_status,
648 const DATA_BLOB unwrapped_out, DATA_BLOB *out)
649 {
650 struct spnego_data spnego_out;
651 DATA_BLOB null_data_blob = data_blob(NULL, 0);
652
653 /* compose reply */
654 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
655 spnego_out.negTokenTarg.responseToken = unwrapped_out;
656 spnego_out.negTokenTarg.mechListMIC = null_data_blob;
657 spnego_out.negTokenTarg.supportedMech = NULL;
658
659 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
660 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
661 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
662 spnego_state->state_position = SPNEGO_SERVER_TARG;
663 } else if (NT_STATUS_IS_OK(nt_status)) {
664 if (unwrapped_out.data) {
665 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
666 }
667 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
668 spnego_state->state_position = SPNEGO_DONE;
669 } else {
670 spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
671 DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
672 spnego_state->state_position = SPNEGO_DONE;
673 }
674
675 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
676 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
677 return NT_STATUS_INVALID_PARAMETER;
678 }
679
680 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
681
682 return nt_status;
683 }
684
685
686 static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
687 const DATA_BLOB in, DATA_BLOB *out)
688 {
689 struct spnego_state *spnego_state = gensec_security->private_data;
690 DATA_BLOB null_data_blob = data_blob(NULL, 0);
691 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
692 struct spnego_data spnego_out;
693 struct spnego_data spnego;
694
695 ssize_t len;
696
697 *out = data_blob(NULL, 0);
698
699 if (!out_mem_ctx) {
700 out_mem_ctx = spnego_state;
701 }
702
703 /* and switch into the state machine */
704
705 switch (spnego_state->state_position) {
706 case SPNEGO_FALLBACK:
707 return gensec_update(spnego_state->sub_sec_security,
708 out_mem_ctx, in, out);
709 case SPNEGO_SERVER_START:
710 {
711 NTSTATUS nt_status;
712 if (in.length) {
713
714 len = spnego_read_data(in, &spnego);
715 if (len == -1) {
716 return gensec_spnego_server_try_fallback(gensec_security, spnego_state,
717 out_mem_ctx, in, out);
718 }
719 /* client sent NegTargetInit, we send NegTokenTarg */
720
721 /* OK, so it's real SPNEGO, check the packet's the one we expect */
722 if (spnego.type != spnego_state->expected_packet) {
723 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
724 spnego_state->expected_packet));
725 dump_data(1, in.data, in.length);
726 spnego_free_data(&spnego);
727 return NT_STATUS_INVALID_PARAMETER;
728 }
729
730 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
731 spnego_state,
732 out_mem_ctx,
733 spnego.negTokenInit.mechTypes,
734 spnego.negTokenInit.mechToken,
735 &unwrapped_out);
736
737 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
738 spnego_state,
739 out_mem_ctx,
740 nt_status,
741 unwrapped_out,
742 out);
743
744 spnego_free_data(&spnego);
745
746 return nt_status;
747 } else {
748 nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
749 out_mem_ctx, in, out);
750 spnego_state->state_position = SPNEGO_SERVER_START;
751 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
752 return nt_status;
753 }
754 }
755
756 case SPNEGO_CLIENT_START:
757 {
758 /* The server offers a list of mechanisms */
759
760 const char *my_mechs[] = {NULL, NULL};
761 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
762
763 if (!in.length) {
764 /* client to produce negTokenInit */
765 nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
766 out_mem_ctx, in, out);
767 spnego_state->state_position = SPNEGO_CLIENT_TARG;
768 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
769 return nt_status;
770 }
771
772 len = spnego_read_data(in, &spnego);
773
774 if (len == -1) {
775 DEBUG(1, ("Invalid SPNEGO request:\n"));
776 dump_data(1, in.data, in.length);
777 return NT_STATUS_INVALID_PARAMETER;
778 }
779
780 /* OK, so it's real SPNEGO, check the packet's the one we expect */
781 if (spnego.type != spnego_state->expected_packet) {
782 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
783 spnego_state->expected_packet));
784 dump_data(1, in.data, in.length);
785 spnego_free_data(&spnego);
786 return NT_STATUS_INVALID_PARAMETER;
787 }
788
789 if (spnego.negTokenInit.targetPrincipal) {
790 DEBUG(5, ("Server claims it's principal name is %s\n", spnego.negTokenInit.targetPrincipal));
791 gensec_set_target_principal(gensec_security, spnego.negTokenInit.targetPrincipal);
792 }
793
794 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
795 spnego_state,
796 out_mem_ctx,
797 spnego.negTokenInit.mechTypes,
798 spnego.negTokenInit.mechToken,
799 &unwrapped_out);
800
801 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
802 spnego_free_data(&spnego);
803 return nt_status;
804 }
805
806 my_mechs[0] = spnego_state->neg_oid;
807 /* compose reply */
808 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
809 spnego_out.negTokenInit.mechTypes = my_mechs;
810 spnego_out.negTokenInit.reqFlags = 0;
811 spnego_out.negTokenInit.mechListMIC = null_data_blob;
812 spnego_out.negTokenInit.mechToken = unwrapped_out;
813
814 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
815 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
816 return NT_STATUS_INVALID_PARAMETER;
817 }
818
819 /* set next state */
820 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
821 spnego_state->state_position = SPNEGO_CLIENT_TARG;
822
823 if (NT_STATUS_IS_OK(nt_status)) {
824 spnego_state->no_response_expected = True;
825 }
826
827 spnego_free_data(&spnego);
828 return NT_STATUS_MORE_PROCESSING_REQUIRED;
829 }
830 case SPNEGO_SERVER_TARG:
831 {
832 NTSTATUS nt_status;
833 if (!in.length) {
834 return NT_STATUS_INVALID_PARAMETER;
835 }
836
837 len = spnego_read_data(in, &spnego);
838
839 if (len == -1) {
840 DEBUG(1, ("Invalid SPNEGO request:\n"));
841 dump_data(1, in.data, in.length);
842 return NT_STATUS_INVALID_PARAMETER;
843 }
844
845 /* OK, so it's real SPNEGO, check the packet's the one we expect */
846 if (spnego.type != spnego_state->expected_packet) {
847 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
848 spnego_state->expected_packet));
849 dump_data(1, in.data, in.length);
850 spnego_free_data(&spnego);
851 return NT_STATUS_INVALID_PARAMETER;
852 }
853
854 if (!spnego_state->sub_sec_security) {
855 DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
856 spnego_free_data(&spnego);
857 return NT_STATUS_INVALID_PARAMETER;
858 }
859
860 nt_status = gensec_update(spnego_state->sub_sec_security,
861 out_mem_ctx,
862 spnego.negTokenTarg.responseToken,
863 &unwrapped_out);
864
865 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
866 spnego_state,
867 out_mem_ctx,
868 nt_status,
869 unwrapped_out,
870 out);
871
872 spnego_free_data(&spnego);
873
874 return nt_status;
875 }
876 case SPNEGO_CLIENT_TARG:
877 {
878 NTSTATUS nt_status;
879 if (!in.length) {
880 return NT_STATUS_INVALID_PARAMETER;
881 }
882
883 len = spnego_read_data(in, &spnego);
884
885 if (len == -1) {
886 DEBUG(1, ("Invalid SPNEGO request:\n"));
887 dump_data(1, in.data, in.length);
888 return NT_STATUS_INVALID_PARAMETER;
889 }
890
891 /* OK, so it's real SPNEGO, check the packet's the one we expect */
892 if (spnego.type != spnego_state->expected_packet) {
893 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
894 spnego_state->expected_packet));
895 dump_data(1, in.data, in.length);
896 spnego_free_data(&spnego);
897 return NT_STATUS_INVALID_PARAMETER;
898 }
899
900 if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
901 spnego_free_data(&spnego);
902 return NT_STATUS_ACCESS_DENIED;
903 }
904
905 /* Server didn't like our choice of mech, and chose something else */
906 if ((spnego.negTokenTarg.negResult == SPNEGO_ACCEPT_INCOMPLETE) &&
907 spnego.negTokenTarg.supportedMech &&
908 strcmp(spnego.negTokenTarg.supportedMech, spnego_state->neg_oid) != 0) {
909 DEBUG(3,("GENSEC SPNEGO: client preferred mech (%s) not accepted, server wants: %s\n",
910 gensec_get_name_by_oid(spnego.negTokenTarg.supportedMech),
911 gensec_get_name_by_oid(spnego_state->neg_oid)));
912
913 talloc_free(spnego_state->sub_sec_security);
914 nt_status = gensec_subcontext_start(spnego_state,
915 gensec_security,
916 &spnego_state->sub_sec_security);
917 if (!NT_STATUS_IS_OK(nt_status)) {
918 spnego_free_data(&spnego);
919 return nt_status;
920 }
921 /* select the sub context */
922 nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
923 spnego.negTokenTarg.supportedMech);
924 if (!NT_STATUS_IS_OK(nt_status)) {
925 spnego_free_data(&spnego);
926 return nt_status;
927 }
928
929 nt_status = gensec_update(spnego_state->sub_sec_security,
930 out_mem_ctx,
931 spnego.negTokenTarg.responseToken,
932 &unwrapped_out);
933 spnego_state->neg_oid = talloc_strdup(spnego_state, spnego.negTokenTarg.supportedMech);
934 } else if (spnego_state->no_response_expected) {
935 if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
936 DEBUG(3,("GENSEC SPNEGO: client GENSEC accepted, but server rejected (bad password?)\n"));
937 nt_status = NT_STATUS_INVALID_PARAMETER;
938 } else if (spnego.negTokenTarg.responseToken.length) {
939 DEBUG(2,("GENSEC SPNEGO: client GENSEC accepted, but server continued negotiation!\n"));
940 nt_status = NT_STATUS_INVALID_PARAMETER;
941 } else {
942 nt_status = NT_STATUS_OK;
943 }
944 } else {
945 nt_status = gensec_update(spnego_state->sub_sec_security,
946 out_mem_ctx,
947 spnego.negTokenTarg.responseToken,
948 &unwrapped_out);
949
950 if (NT_STATUS_IS_OK(nt_status)) {
951 spnego_state->no_response_expected = True;
952 }
953 }
954
955 spnego_free_data(&spnego);
956
957 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
958 && !NT_STATUS_IS_OK(nt_status)) {
959 DEBUG(1, ("SPNEGO(%s) login failed: %s\n",
960 spnego_state->sub_sec_security->ops->name,
961 nt_errstr(nt_status)));
962 return nt_status;
963 }
964
965 if (unwrapped_out.length) {
966 /* compose reply */
967 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
968 spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
969 spnego_out.negTokenTarg.supportedMech = NULL;
970 spnego_out.negTokenTarg.responseToken = unwrapped_out;
971 spnego_out.negTokenTarg.mechListMIC = null_data_blob;
972
973 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
974 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
975 return NT_STATUS_INVALID_PARAMETER;
976 }
977
978 spnego_state->state_position = SPNEGO_CLIENT_TARG;
979 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
980 } else {
981
982 /* all done - server has accepted, and we agree */
983 *out = null_data_blob;
984
985 if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
986 /* unless of course it did not accept */
987 DEBUG(1,("gensec_update ok but not accepted\n"));
988 nt_status = NT_STATUS_INVALID_PARAMETER;
989 }
990
991 spnego_state->state_position = SPNEGO_DONE;
992 }
993
994 return nt_status;
995 }
996 case SPNEGO_DONE:
997 /* We should not be called after we are 'done' */
998 return NT_STATUS_INVALID_PARAMETER;
999 }
1000 return NT_STATUS_INVALID_PARAMETER;
1001 }
1002
1003 static BOOL gensec_spnego_have_feature(struct gensec_security *gensec_security,
1004 uint32_t feature)
1005 {
1006 struct spnego_state *spnego_state = gensec_security->private_data;
1007 if (!spnego_state->sub_sec_security) {
1008 return False;
1009 }
1010
1011 return gensec_have_feature(spnego_state->sub_sec_security,
1012 feature);
1013 }
1014
1015 static const char *gensec_spnego_oids[] = {
1016 GENSEC_OID_SPNEGO,
1017 NULL
1018 };
1019
1020 static const struct gensec_security_ops gensec_spnego_security_ops = {
1021 .name = "spnego",
1022 .sasl_name = "GSS-SPNEGO",
1023 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1024 .oid = gensec_spnego_oids,
1025 .client_start = gensec_spnego_client_start,
1026 .server_start = gensec_spnego_server_start,
1027 .update = gensec_spnego_update,
1028 .seal_packet = gensec_spnego_seal_packet,
1029 .sign_packet = gensec_spnego_sign_packet,
1030 .sig_size = gensec_spnego_sig_size,
1031 .max_wrapped_size = gensec_spnego_max_wrapped_size,
1032 .max_input_size = gensec_spnego_max_input_size,
1033 .check_packet = gensec_spnego_check_packet,
1034 .unseal_packet = gensec_spnego_unseal_packet,
1035 .packet_full_request = gensec_spnego_packet_full_request,
1036 .wrap = gensec_spnego_wrap,
1037 .unwrap = gensec_spnego_unwrap,
1038 .wrap_packets = gensec_spnego_wrap_packets,
1039 .unwrap_packets = gensec_spnego_unwrap_packets,
1040 .session_key = gensec_spnego_session_key,
1041 .session_info = gensec_spnego_session_info,
1042 .have_feature = gensec_spnego_have_feature,
1043 .enabled = True,
1044 .priority = GENSEC_SPNEGO
1045 };
1046
1047 NTSTATUS gensec_spnego_init(void)
1048 {
1049 NTSTATUS ret;
1050 ret = gensec_register(&gensec_spnego_security_ops);
1051 if (!NT_STATUS_IS_OK(ret)) {
1052 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1053 gensec_spnego_security_ops.name));
1054 return ret;
1055 }
1056
1057 return ret;
1058 }
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