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
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 2 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 generate a negTokenInit packet given a GUID, a list of supported
27 OIDs (the mechanisms) and a principal name string
29 DATA_BLOB spnego_gen_negTokenInit(char guid[16],
31 const char *principal)
37 memset(&data, 0, sizeof(data));
39 asn1_write(&data, guid, 16);
40 asn1_push_tag(&data,ASN1_APPLICATION(0));
41 asn1_write_OID(&data,OID_SPNEGO);
42 asn1_push_tag(&data,ASN1_CONTEXT(0));
43 asn1_push_tag(&data,ASN1_SEQUENCE(0));
45 asn1_push_tag(&data,ASN1_CONTEXT(0));
46 asn1_push_tag(&data,ASN1_SEQUENCE(0));
47 for (i=0; OIDs[i]; i++) {
48 asn1_write_OID(&data,OIDs[i]);
53 asn1_push_tag(&data, ASN1_CONTEXT(3));
54 asn1_push_tag(&data, ASN1_SEQUENCE(0));
55 asn1_push_tag(&data, ASN1_CONTEXT(0));
56 asn1_write_GeneralString(&data,principal);
67 DEBUG(1,("Failed to build negTokenInit at offset %d\n", (int)data.ofs));
71 ret = data_blob(data.data, data.length);
78 Generate a negTokenInit as used by the client side ... It has a mechType
79 (OID), and a mechToken (a security blob) ...
81 Really, we need to break out the NTLMSSP stuff as well, because it could be
84 DATA_BLOB gen_negTokenInit(const char *OID, DATA_BLOB blob)
89 memset(&data, 0, sizeof(data));
91 asn1_push_tag(&data, ASN1_APPLICATION(0));
92 asn1_write_OID(&data,OID_SPNEGO);
93 asn1_push_tag(&data, ASN1_CONTEXT(0));
94 asn1_push_tag(&data, ASN1_SEQUENCE(0));
96 asn1_push_tag(&data, ASN1_CONTEXT(0));
97 asn1_push_tag(&data, ASN1_SEQUENCE(0));
98 asn1_write_OID(&data, OID);
102 asn1_push_tag(&data, ASN1_CONTEXT(2));
103 asn1_write_OctetString(&data,blob.data,blob.length);
111 if (data.has_error) {
112 DEBUG(1,("Failed to build negTokenInit at offset %d\n", (int)data.ofs));
116 ret = data_blob(data.data, data.length);
123 parse a negTokenInit packet giving a GUID, a list of supported
124 OIDs (the mechanisms) and a principal name string
126 BOOL spnego_parse_negTokenInit(DATA_BLOB blob,
127 char *OIDs[ASN1_MAX_OIDS],
134 asn1_load(&data, blob);
136 asn1_start_tag(&data,ASN1_APPLICATION(0));
137 asn1_check_OID(&data,OID_SPNEGO);
138 asn1_start_tag(&data,ASN1_CONTEXT(0));
139 asn1_start_tag(&data,ASN1_SEQUENCE(0));
141 asn1_start_tag(&data,ASN1_CONTEXT(0));
142 asn1_start_tag(&data,ASN1_SEQUENCE(0));
143 for (i=0; asn1_tag_remaining(&data) > 0 && i < ASN1_MAX_OIDS-1; i++) {
144 char *oid_str = NULL;
145 asn1_read_OID(&data,&oid_str);
152 asn1_start_tag(&data, ASN1_CONTEXT(3));
153 asn1_start_tag(&data, ASN1_SEQUENCE(0));
154 asn1_start_tag(&data, ASN1_CONTEXT(0));
155 asn1_read_GeneralString(&data,principal);
165 ret = !data.has_error;
166 if (data.has_error) {
168 SAFE_FREE(*principal);
169 for(j = 0; j < i && j < ASN1_MAX_OIDS-1; j++) {
179 generate a negTokenTarg packet given a list of OIDs and a security blob
181 DATA_BLOB gen_negTokenTarg(const char *OIDs[], DATA_BLOB blob)
187 memset(&data, 0, sizeof(data));
189 asn1_push_tag(&data, ASN1_APPLICATION(0));
190 asn1_write_OID(&data,OID_SPNEGO);
191 asn1_push_tag(&data, ASN1_CONTEXT(0));
192 asn1_push_tag(&data, ASN1_SEQUENCE(0));
194 asn1_push_tag(&data, ASN1_CONTEXT(0));
195 asn1_push_tag(&data, ASN1_SEQUENCE(0));
196 for (i=0; OIDs[i]; i++) {
197 asn1_write_OID(&data,OIDs[i]);
202 asn1_push_tag(&data, ASN1_CONTEXT(2));
203 asn1_write_OctetString(&data,blob.data,blob.length);
211 if (data.has_error) {
212 DEBUG(1,("Failed to build negTokenTarg at offset %d\n", (int)data.ofs));
216 ret = data_blob(data.data, data.length);
223 parse a negTokenTarg packet giving a list of OIDs and a security blob
225 BOOL parse_negTokenTarg(DATA_BLOB blob, char *OIDs[ASN1_MAX_OIDS], DATA_BLOB *secblob)
230 asn1_load(&data, blob);
231 asn1_start_tag(&data, ASN1_APPLICATION(0));
232 asn1_check_OID(&data,OID_SPNEGO);
233 asn1_start_tag(&data, ASN1_CONTEXT(0));
234 asn1_start_tag(&data, ASN1_SEQUENCE(0));
236 asn1_start_tag(&data, ASN1_CONTEXT(0));
237 asn1_start_tag(&data, ASN1_SEQUENCE(0));
238 for (i=0; asn1_tag_remaining(&data) > 0 && i < ASN1_MAX_OIDS-1; i++) {
239 char *oid_str = NULL;
240 asn1_read_OID(&data,&oid_str);
247 asn1_start_tag(&data, ASN1_CONTEXT(2));
248 asn1_read_OctetString(&data,secblob);
256 if (data.has_error) {
258 data_blob_free(secblob);
259 for(j = 0; j < i && j < ASN1_MAX_OIDS-1; j++) {
262 DEBUG(1,("Failed to parse negTokenTarg at offset %d\n", (int)data.ofs));
272 generate a krb5 GSS-API wrapper packet given a ticket
274 DATA_BLOB spnego_gen_krb5_wrap(const DATA_BLOB ticket, const uint8 tok_id[2])
279 memset(&data, 0, sizeof(data));
281 asn1_push_tag(&data, ASN1_APPLICATION(0));
282 asn1_write_OID(&data, OID_KERBEROS5);
284 asn1_write(&data, tok_id, 2);
285 asn1_write(&data, ticket.data, ticket.length);
288 if (data.has_error) {
289 DEBUG(1,("Failed to build krb5 wrapper at offset %d\n", (int)data.ofs));
293 ret = data_blob(data.data, data.length);
300 parse a krb5 GSS-API wrapper packet giving a ticket
302 BOOL spnego_parse_krb5_wrap(DATA_BLOB blob, DATA_BLOB *ticket, uint8 tok_id[2])
308 asn1_load(&data, blob);
309 asn1_start_tag(&data, ASN1_APPLICATION(0));
310 asn1_check_OID(&data, OID_KERBEROS5);
312 data_remaining = asn1_tag_remaining(&data);
314 if (data_remaining < 3) {
315 data.has_error = True;
317 asn1_read(&data, tok_id, 2);
319 *ticket = data_blob(NULL, data_remaining);
320 asn1_read(&data, ticket->data, ticket->length);
325 ret = !data.has_error;
327 if (data.has_error) {
328 data_blob_free(ticket);
338 generate a SPNEGO negTokenTarg packet, ready for a EXTENDED_SECURITY
339 kerberos session setup
341 int spnego_gen_negTokenTarg(const char *principal, int time_offset,
343 DATA_BLOB *session_key_krb5, uint32 extra_ap_opts)
346 DATA_BLOB tkt, tkt_wrapped;
347 const char *krb_mechs[] = {OID_KERBEROS5_OLD, OID_NTLMSSP, NULL};
349 /* get a kerberos ticket for the service and extract the session key */
350 retval = cli_krb5_get_ticket(principal, time_offset,
351 &tkt, session_key_krb5, extra_ap_opts, NULL);
356 /* wrap that up in a nice GSS-API wrapping */
357 tkt_wrapped = spnego_gen_krb5_wrap(tkt, TOK_ID_KRB_AP_REQ);
359 /* and wrap that in a shiny SPNEGO wrapper */
360 *targ = gen_negTokenTarg(krb_mechs, tkt_wrapped);
362 data_blob_free(&tkt_wrapped);
363 data_blob_free(&tkt);
370 parse a spnego NTLMSSP challenge packet giving two security blobs
372 BOOL spnego_parse_challenge(const DATA_BLOB blob,
373 DATA_BLOB *chal1, DATA_BLOB *chal2)
381 asn1_load(&data, blob);
382 asn1_start_tag(&data,ASN1_CONTEXT(1));
383 asn1_start_tag(&data,ASN1_SEQUENCE(0));
385 asn1_start_tag(&data,ASN1_CONTEXT(0));
386 asn1_check_enumerated(&data,1);
389 asn1_start_tag(&data,ASN1_CONTEXT(1));
390 asn1_check_OID(&data, OID_NTLMSSP);
393 asn1_start_tag(&data,ASN1_CONTEXT(2));
394 asn1_read_OctetString(&data, chal1);
397 /* the second challenge is optional (XP doesn't send it) */
398 if (asn1_tag_remaining(&data)) {
399 asn1_start_tag(&data,ASN1_CONTEXT(3));
400 asn1_read_OctetString(&data, chal2);
407 ret = !data.has_error;
409 if (data.has_error) {
410 data_blob_free(chal1);
411 data_blob_free(chal2);
420 generate a SPNEGO auth packet. This will contain the encrypted passwords
422 DATA_BLOB spnego_gen_auth(DATA_BLOB blob)
427 memset(&data, 0, sizeof(data));
429 asn1_push_tag(&data, ASN1_CONTEXT(1));
430 asn1_push_tag(&data, ASN1_SEQUENCE(0));
431 asn1_push_tag(&data, ASN1_CONTEXT(2));
432 asn1_write_OctetString(&data,blob.data,blob.length);
437 ret = data_blob(data.data, data.length);
445 parse a SPNEGO auth packet. This contains the encrypted passwords
447 BOOL spnego_parse_auth(DATA_BLOB blob, DATA_BLOB *auth)
451 asn1_load(&data, blob);
452 asn1_start_tag(&data, ASN1_CONTEXT(1));
453 asn1_start_tag(&data, ASN1_SEQUENCE(0));
454 asn1_start_tag(&data, ASN1_CONTEXT(2));
455 asn1_read_OctetString(&data,auth);
460 if (data.has_error) {
461 DEBUG(3,("spnego_parse_auth failed at %d\n", (int)data.ofs));
462 data_blob_free(auth);
472 generate a minimal SPNEGO response packet. Doesn't contain much.
474 DATA_BLOB spnego_gen_auth_response(DATA_BLOB *reply, NTSTATUS nt_status,
481 if (NT_STATUS_IS_OK(nt_status)) {
482 negResult = SPNEGO_NEG_RESULT_ACCEPT;
483 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
484 negResult = SPNEGO_NEG_RESULT_INCOMPLETE;
486 negResult = SPNEGO_NEG_RESULT_REJECT;
491 asn1_push_tag(&data, ASN1_CONTEXT(1));
492 asn1_push_tag(&data, ASN1_SEQUENCE(0));
493 asn1_push_tag(&data, ASN1_CONTEXT(0));
494 asn1_write_enumerated(&data, negResult);
497 if (reply->data != NULL) {
498 asn1_push_tag(&data,ASN1_CONTEXT(1));
499 asn1_write_OID(&data, mechOID);
502 asn1_push_tag(&data,ASN1_CONTEXT(2));
503 asn1_write_OctetString(&data, reply->data, reply->length);
510 ret = data_blob(data.data, data.length);
516 parse a SPNEGO NTLMSSP auth packet. This contains the encrypted passwords
518 BOOL spnego_parse_auth_response(DATA_BLOB blob, NTSTATUS nt_status,
524 if (NT_STATUS_IS_OK(nt_status)) {
525 negResult = SPNEGO_NEG_RESULT_ACCEPT;
526 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
527 negResult = SPNEGO_NEG_RESULT_INCOMPLETE;
529 negResult = SPNEGO_NEG_RESULT_REJECT;
532 asn1_load(&data, blob);
533 asn1_start_tag(&data, ASN1_CONTEXT(1));
534 asn1_start_tag(&data, ASN1_SEQUENCE(0));
535 asn1_start_tag(&data, ASN1_CONTEXT(0));
536 asn1_check_enumerated(&data, negResult);
539 if (negResult == SPNEGO_NEG_RESULT_INCOMPLETE) {
540 asn1_start_tag(&data,ASN1_CONTEXT(1));
541 asn1_check_OID(&data, OID_NTLMSSP);
544 asn1_start_tag(&data,ASN1_CONTEXT(2));
545 asn1_read_OctetString(&data, auth);
552 if (data.has_error) {
553 DEBUG(3,("spnego_parse_auth_response failed at %d\n", (int)data.ofs));
555 data_blob_free(auth);