source: branches/samba-3.3.x/source/libsmb/clispnego.c

Last change on this file was 206, checked in by Herwig Bauernfeind, 16 years ago

Import Samba 3.3 branch at 3.0.0 level (psmedley's port)
File size: 13.9 KB
RevLine 
[206]1/*
2 Unix SMB/CIFS implementation.
3 simple kerberos5/SPNEGO routines
4 Copyright (C) Andrew Tridgell 2001
5 Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2002
6 Copyright (C) Luke Howard 2003
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20*/
21
22#include "includes.h"
23
24/*
25 generate a negTokenInit packet given a GUID, a list of supported
26 OIDs (the mechanisms) and a principal name string
27*/
28DATA_BLOB spnego_gen_negTokenInit(char guid[16],
29 const char *OIDs[],
30 const char *principal)
31{
32 int i;
33 ASN1_DATA data;
34 DATA_BLOB ret;
35
36 memset(&data, 0, sizeof(data));
37
38 asn1_write(&data, guid, 16);
39 asn1_push_tag(&data,ASN1_APPLICATION(0));
40 asn1_write_OID(&data,OID_SPNEGO);
41 asn1_push_tag(&data,ASN1_CONTEXT(0));
42 asn1_push_tag(&data,ASN1_SEQUENCE(0));
43
44 asn1_push_tag(&data,ASN1_CONTEXT(0));
45 asn1_push_tag(&data,ASN1_SEQUENCE(0));
46 for (i=0; OIDs[i]; i++) {
47 asn1_write_OID(&data,OIDs[i]);
48 }
49 asn1_pop_tag(&data);
50 asn1_pop_tag(&data);
51
52 asn1_push_tag(&data, ASN1_CONTEXT(3));
53 asn1_push_tag(&data, ASN1_SEQUENCE(0));
54 asn1_push_tag(&data, ASN1_CONTEXT(0));
55 asn1_write_GeneralString(&data,principal);
56 asn1_pop_tag(&data);
57 asn1_pop_tag(&data);
58 asn1_pop_tag(&data);
59
60 asn1_pop_tag(&data);
61 asn1_pop_tag(&data);
62
63 asn1_pop_tag(&data);
64
65 if (data.has_error) {
66 DEBUG(1,("Failed to build negTokenInit at offset %d\n", (int)data.ofs));
67 asn1_free(&data);
68 }
69
70 ret = data_blob(data.data, data.length);
71 asn1_free(&data);
72
73 return ret;
74}
75
76/*
77 Generate a negTokenInit as used by the client side ... It has a mechType
78 (OID), and a mechToken (a security blob) ...
79
80 Really, we need to break out the NTLMSSP stuff as well, because it could be
81 raw in the packets!
82*/
83DATA_BLOB gen_negTokenInit(const char *OID, DATA_BLOB blob)
84{
85 ASN1_DATA data;
86 DATA_BLOB ret;
87
88 memset(&data, 0, sizeof(data));
89
90 asn1_push_tag(&data, ASN1_APPLICATION(0));
91 asn1_write_OID(&data,OID_SPNEGO);
92 asn1_push_tag(&data, ASN1_CONTEXT(0));
93 asn1_push_tag(&data, ASN1_SEQUENCE(0));
94
95 asn1_push_tag(&data, ASN1_CONTEXT(0));
96 asn1_push_tag(&data, ASN1_SEQUENCE(0));
97 asn1_write_OID(&data, OID);
98 asn1_pop_tag(&data);
99 asn1_pop_tag(&data);
100
101 asn1_push_tag(&data, ASN1_CONTEXT(2));
102 asn1_write_OctetString(&data,blob.data,blob.length);
103 asn1_pop_tag(&data);
104
105 asn1_pop_tag(&data);
106 asn1_pop_tag(&data);
107
108 asn1_pop_tag(&data);
109
110 if (data.has_error) {
111 DEBUG(1,("Failed to build negTokenInit at offset %d\n", (int)data.ofs));
112 asn1_free(&data);
113 }
114
115 ret = data_blob(data.data, data.length);
116 asn1_free(&data);
117
118 return ret;
119}
120
121/*
122 parse a negTokenInit packet giving a GUID, a list of supported
123 OIDs (the mechanisms) and a principal name string
124*/
125bool spnego_parse_negTokenInit(DATA_BLOB blob,
126 char *OIDs[ASN1_MAX_OIDS],
127 char **principal)
128{
129 int i;
130 bool ret;
131 ASN1_DATA data;
132
133 asn1_load(&data, blob);
134
135 asn1_start_tag(&data,ASN1_APPLICATION(0));
136 asn1_check_OID(&data,OID_SPNEGO);
137 asn1_start_tag(&data,ASN1_CONTEXT(0));
138 asn1_start_tag(&data,ASN1_SEQUENCE(0));
139
140 asn1_start_tag(&data,ASN1_CONTEXT(0));
141 asn1_start_tag(&data,ASN1_SEQUENCE(0));
142 for (i=0; asn1_tag_remaining(&data) > 0 && i < ASN1_MAX_OIDS-1; i++) {
143 char *oid_str = NULL;
144 asn1_read_OID(&data,&oid_str);
145 OIDs[i] = oid_str;
146 }
147 OIDs[i] = NULL;
148 asn1_end_tag(&data);
149 asn1_end_tag(&data);
150
151 *principal = NULL;
152 if (asn1_tag_remaining(&data) > 0) {
153 asn1_start_tag(&data, ASN1_CONTEXT(3));
154 asn1_start_tag(&data, ASN1_SEQUENCE(0));
155 asn1_start_tag(&data, ASN1_CONTEXT(0));
156 asn1_read_GeneralString(&data,principal);
157 asn1_end_tag(&data);
158 asn1_end_tag(&data);
159 asn1_end_tag(&data);
160 }
161
162 asn1_end_tag(&data);
163 asn1_end_tag(&data);
164
165 asn1_end_tag(&data);
166
167 ret = !data.has_error;
168 if (data.has_error) {
169 int j;
170 SAFE_FREE(*principal);
171 for(j = 0; j < i && j < ASN1_MAX_OIDS-1; j++) {
172 SAFE_FREE(OIDs[j]);
173 }
174 }
175
176 asn1_free(&data);
177 return ret;
178}
179
180/*
181 generate a negTokenTarg packet given a list of OIDs and a security blob
182*/
183DATA_BLOB gen_negTokenTarg(const char *OIDs[], DATA_BLOB blob)
184{
185 int i;
186 ASN1_DATA data;
187 DATA_BLOB ret;
188
189 memset(&data, 0, sizeof(data));
190
191 asn1_push_tag(&data, ASN1_APPLICATION(0));
192 asn1_write_OID(&data,OID_SPNEGO);
193 asn1_push_tag(&data, ASN1_CONTEXT(0));
194 asn1_push_tag(&data, ASN1_SEQUENCE(0));
195
196 asn1_push_tag(&data, ASN1_CONTEXT(0));
197 asn1_push_tag(&data, ASN1_SEQUENCE(0));
198 for (i=0; OIDs[i]; i++) {
199 asn1_write_OID(&data,OIDs[i]);
200 }
201 asn1_pop_tag(&data);
202 asn1_pop_tag(&data);
203
204 asn1_push_tag(&data, ASN1_CONTEXT(2));
205 asn1_write_OctetString(&data,blob.data,blob.length);
206 asn1_pop_tag(&data);
207
208 asn1_pop_tag(&data);
209 asn1_pop_tag(&data);
210
211 asn1_pop_tag(&data);
212
213 if (data.has_error) {
214 DEBUG(1,("Failed to build negTokenTarg at offset %d\n", (int)data.ofs));
215 asn1_free(&data);
216 }
217
218 ret = data_blob(data.data, data.length);
219 asn1_free(&data);
220
221 return ret;
222}
223
224/*
225 parse a negTokenTarg packet giving a list of OIDs and a security blob
226*/
227bool parse_negTokenTarg(DATA_BLOB blob, char *OIDs[ASN1_MAX_OIDS], DATA_BLOB *secblob)
228{
229 int i;
230 ASN1_DATA data;
231
232 asn1_load(&data, blob);
233 asn1_start_tag(&data, ASN1_APPLICATION(0));
234 asn1_check_OID(&data,OID_SPNEGO);
235 asn1_start_tag(&data, ASN1_CONTEXT(0));
236 asn1_start_tag(&data, ASN1_SEQUENCE(0));
237
238 asn1_start_tag(&data, ASN1_CONTEXT(0));
239 asn1_start_tag(&data, ASN1_SEQUENCE(0));
240 for (i=0; asn1_tag_remaining(&data) > 0 && i < ASN1_MAX_OIDS-1; i++) {
241 char *oid_str = NULL;
242 asn1_read_OID(&data,&oid_str);
243 OIDs[i] = oid_str;
244 }
245 OIDs[i] = NULL;
246 asn1_end_tag(&data);
247 asn1_end_tag(&data);
248
249 /* Skip any optional req_flags that are sent per RFC 4178 */
250 if (asn1_check_tag(&data, ASN1_CONTEXT(1))) {
251 uint8 flags;
252
253 asn1_start_tag(&data, ASN1_CONTEXT(1));
254 asn1_start_tag(&data, ASN1_BITFIELD);
255 while (asn1_tag_remaining(&data) > 0)
256 asn1_read_uint8(&data, &flags);
257 asn1_end_tag(&data);
258 asn1_end_tag(&data);
259 }
260
261 asn1_start_tag(&data, ASN1_CONTEXT(2));
262 asn1_read_OctetString(&data,secblob);
263 asn1_end_tag(&data);
264
265 asn1_end_tag(&data);
266 asn1_end_tag(&data);
267
268 asn1_end_tag(&data);
269
270 if (data.has_error) {
271 int j;
272 data_blob_free(secblob);
273 for(j = 0; j < i && j < ASN1_MAX_OIDS-1; j++) {
274 SAFE_FREE(OIDs[j]);
275 }
276 DEBUG(1,("Failed to parse negTokenTarg at offset %d\n", (int)data.ofs));
277 asn1_free(&data);
278 return False;
279 }
280
281 asn1_free(&data);
282 return True;
283}
284
285/*
286 generate a krb5 GSS-API wrapper packet given a ticket
287*/
288DATA_BLOB spnego_gen_krb5_wrap(const DATA_BLOB ticket, const uint8 tok_id[2])
289{
290 ASN1_DATA data;
291 DATA_BLOB ret;
292
293 memset(&data, 0, sizeof(data));
294
295 asn1_push_tag(&data, ASN1_APPLICATION(0));
296 asn1_write_OID(&data, OID_KERBEROS5);
297
298 asn1_write(&data, tok_id, 2);
299 asn1_write(&data, ticket.data, ticket.length);
300 asn1_pop_tag(&data);
301
302 if (data.has_error) {
303 DEBUG(1,("Failed to build krb5 wrapper at offset %d\n", (int)data.ofs));
304 asn1_free(&data);
305 }
306
307 ret = data_blob(data.data, data.length);
308 asn1_free(&data);
309
310 return ret;
311}
312
313/*
314 parse a krb5 GSS-API wrapper packet giving a ticket
315*/
316bool spnego_parse_krb5_wrap(DATA_BLOB blob, DATA_BLOB *ticket, uint8 tok_id[2])
317{
318 bool ret;
319 ASN1_DATA data;
320 int data_remaining;
321
322 asn1_load(&data, blob);
323 asn1_start_tag(&data, ASN1_APPLICATION(0));
324 asn1_check_OID(&data, OID_KERBEROS5);
325
326 data_remaining = asn1_tag_remaining(&data);
327
328 if (data_remaining < 3) {
329 data.has_error = True;
330 } else {
331 asn1_read(&data, tok_id, 2);
332 data_remaining -= 2;
333 *ticket = data_blob(NULL, data_remaining);
334 asn1_read(&data, ticket->data, ticket->length);
335 }
336
337 asn1_end_tag(&data);
338
339 ret = !data.has_error;
340
341 if (data.has_error) {
342 data_blob_free(ticket);
343 }
344
345 asn1_free(&data);
346
347 return ret;
348}
349
350
351/*
352 generate a SPNEGO negTokenTarg packet, ready for a EXTENDED_SECURITY
353 kerberos session setup
354*/
355int spnego_gen_negTokenTarg(const char *principal, int time_offset,
356 DATA_BLOB *targ,
357 DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
358 time_t *expire_time)
359{
360 int retval;
361 DATA_BLOB tkt, tkt_wrapped;
362 const char *krb_mechs[] = {OID_KERBEROS5_OLD, OID_KERBEROS5, OID_NTLMSSP, NULL};
363
364 /* get a kerberos ticket for the service and extract the session key */
365 retval = cli_krb5_get_ticket(principal, time_offset,
366 &tkt, session_key_krb5, extra_ap_opts, NULL,
367 expire_time);
368
369 if (retval)
370 return retval;
371
372 /* wrap that up in a nice GSS-API wrapping */
373 tkt_wrapped = spnego_gen_krb5_wrap(tkt, TOK_ID_KRB_AP_REQ);
374
375 /* and wrap that in a shiny SPNEGO wrapper */
376 *targ = gen_negTokenTarg(krb_mechs, tkt_wrapped);
377
378 data_blob_free(&tkt_wrapped);
379 data_blob_free(&tkt);
380
381 return retval;
382}
383
384
385/*
386 parse a spnego NTLMSSP challenge packet giving two security blobs
387*/
388bool spnego_parse_challenge(const DATA_BLOB blob,
389 DATA_BLOB *chal1, DATA_BLOB *chal2)
390{
391 bool ret;
392 ASN1_DATA data;
393
394 ZERO_STRUCTP(chal1);
395 ZERO_STRUCTP(chal2);
396
397 asn1_load(&data, blob);
398 asn1_start_tag(&data,ASN1_CONTEXT(1));
399 asn1_start_tag(&data,ASN1_SEQUENCE(0));
400
401 asn1_start_tag(&data,ASN1_CONTEXT(0));
402 asn1_check_enumerated(&data,1);
403 asn1_end_tag(&data);
404
405 asn1_start_tag(&data,ASN1_CONTEXT(1));
406 asn1_check_OID(&data, OID_NTLMSSP);
407 asn1_end_tag(&data);
408
409 asn1_start_tag(&data,ASN1_CONTEXT(2));
410 asn1_read_OctetString(&data, chal1);
411 asn1_end_tag(&data);
412
413 /* the second challenge is optional (XP doesn't send it) */
414 if (asn1_tag_remaining(&data)) {
415 asn1_start_tag(&data,ASN1_CONTEXT(3));
416 asn1_read_OctetString(&data, chal2);
417 asn1_end_tag(&data);
418 }
419
420 asn1_end_tag(&data);
421 asn1_end_tag(&data);
422
423 ret = !data.has_error;
424
425 if (data.has_error) {
426 data_blob_free(chal1);
427 data_blob_free(chal2);
428 }
429
430 asn1_free(&data);
431 return ret;
432}
433
434
435/*
436 generate a SPNEGO auth packet. This will contain the encrypted passwords
437*/
438DATA_BLOB spnego_gen_auth(DATA_BLOB blob)
439{
440 ASN1_DATA data;
441 DATA_BLOB ret;
442
443 memset(&data, 0, sizeof(data));
444
445 asn1_push_tag(&data, ASN1_CONTEXT(1));
446 asn1_push_tag(&data, ASN1_SEQUENCE(0));
447 asn1_push_tag(&data, ASN1_CONTEXT(2));
448 asn1_write_OctetString(&data,blob.data,blob.length);
449 asn1_pop_tag(&data);
450 asn1_pop_tag(&data);
451 asn1_pop_tag(&data);
452
453 ret = data_blob(data.data, data.length);
454
455 asn1_free(&data);
456
457 return ret;
458}
459
460/*
461 parse a SPNEGO auth packet. This contains the encrypted passwords
462*/
463bool spnego_parse_auth(DATA_BLOB blob, DATA_BLOB *auth)
464{
465 ASN1_DATA data;
466
467 asn1_load(&data, blob);
468 asn1_start_tag(&data, ASN1_CONTEXT(1));
469 asn1_start_tag(&data, ASN1_SEQUENCE(0));
470 asn1_start_tag(&data, ASN1_CONTEXT(2));
471 asn1_read_OctetString(&data,auth);
472 asn1_end_tag(&data);
473 asn1_end_tag(&data);
474 asn1_end_tag(&data);
475
476 if (data.has_error) {
477 DEBUG(3,("spnego_parse_auth failed at %d\n", (int)data.ofs));
478 data_blob_free(auth);
479 asn1_free(&data);
480 return False;
481 }
482
483 asn1_free(&data);
484 return True;
485}
486
487/*
488 generate a minimal SPNEGO response packet. Doesn't contain much.
489*/
490DATA_BLOB spnego_gen_auth_response(DATA_BLOB *reply, NTSTATUS nt_status,
491 const char *mechOID)
492{
493 ASN1_DATA data;
494 DATA_BLOB ret;
495 uint8 negResult;
496
497 if (NT_STATUS_IS_OK(nt_status)) {
498 negResult = SPNEGO_NEG_RESULT_ACCEPT;
499 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
500 negResult = SPNEGO_NEG_RESULT_INCOMPLETE;
501 } else {
502 negResult = SPNEGO_NEG_RESULT_REJECT;
503 }
504
505 ZERO_STRUCT(data);
506
507 asn1_push_tag(&data, ASN1_CONTEXT(1));
508 asn1_push_tag(&data, ASN1_SEQUENCE(0));
509 asn1_push_tag(&data, ASN1_CONTEXT(0));
510 asn1_write_enumerated(&data, negResult);
511 asn1_pop_tag(&data);
512
513 if (mechOID) {
514 asn1_push_tag(&data,ASN1_CONTEXT(1));
515 asn1_write_OID(&data, mechOID);
516 asn1_pop_tag(&data);
517 }
518
519 if (reply && reply->data != NULL) {
520 asn1_push_tag(&data,ASN1_CONTEXT(2));
521 asn1_write_OctetString(&data, reply->data, reply->length);
522 asn1_pop_tag(&data);
523 }
524
525 asn1_pop_tag(&data);
526 asn1_pop_tag(&data);
527
528 ret = data_blob(data.data, data.length);
529 asn1_free(&data);
530 return ret;
531}
532
533/*
534 parse a SPNEGO auth packet. This contains the encrypted passwords
535*/
536bool spnego_parse_auth_response(DATA_BLOB blob, NTSTATUS nt_status,
537 const char *mechOID,
538 DATA_BLOB *auth)
539{
540 ASN1_DATA data;
541 uint8 negResult;
542
543 if (NT_STATUS_IS_OK(nt_status)) {
544 negResult = SPNEGO_NEG_RESULT_ACCEPT;
545 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
546 negResult = SPNEGO_NEG_RESULT_INCOMPLETE;
547 } else {
548 negResult = SPNEGO_NEG_RESULT_REJECT;
549 }
550
551 asn1_load(&data, blob);
552 asn1_start_tag(&data, ASN1_CONTEXT(1));
553 asn1_start_tag(&data, ASN1_SEQUENCE(0));
554 asn1_start_tag(&data, ASN1_CONTEXT(0));
555 asn1_check_enumerated(&data, negResult);
556 asn1_end_tag(&data);
557
558 *auth = data_blob_null;
559
560 if (asn1_tag_remaining(&data)) {
561 asn1_start_tag(&data,ASN1_CONTEXT(1));
562 asn1_check_OID(&data, mechOID);
563 asn1_end_tag(&data);
564
565 if (asn1_tag_remaining(&data)) {
566 asn1_start_tag(&data,ASN1_CONTEXT(2));
567 asn1_read_OctetString(&data, auth);
568 asn1_end_tag(&data);
569 }
570 } else if (negResult == SPNEGO_NEG_RESULT_INCOMPLETE) {
571 data.has_error = 1;
572 }
573
574 /* Binding against Win2K DC returns a duplicate of the responseToken in
575 * the optional mechListMIC field. This is a bug in Win2K. We ignore
576 * this field if it exists. Win2K8 may return a proper mechListMIC at
577 * which point we need to implement the integrity checking. */
578 if (asn1_tag_remaining(&data)) {
579 DATA_BLOB mechList = data_blob_null;
580 asn1_start_tag(&data, ASN1_CONTEXT(3));
581 asn1_read_OctetString(&data, &mechList);
582 asn1_end_tag(&data);
583 data_blob_free(&mechList);
584 DEBUG(5,("spnego_parse_auth_response received mechListMIC, "
585 "ignoring.\n"));
586 }
587
588 asn1_end_tag(&data);
589 asn1_end_tag(&data);
590
591 if (data.has_error) {
592 DEBUG(3,("spnego_parse_auth_response failed at %d\n", (int)data.ofs));
593 asn1_free(&data);
594 data_blob_free(auth);
595 return False;
596 }
597
598 asn1_free(&data);
599 return True;
600}
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