2 Unix SMB/Netbios implementation.
4 simple kerberos5/SPNEGO routines
5 Copyright (C) Andrew Tridgell 2001
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 generate a negTokenInit packet given a GUID, a list of supported
26 OIDs (the mechanisms) and a principal name string
28 DATA_BLOB spnego_gen_negTokenInit(uint8 guid[16],
30 const char *principal)
36 memset(&data, 0, sizeof(data));
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));
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]);
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);
66 DEBUG(1,("Failed to build negTokenInit at offset %d\n", (int)data.ofs));
70 ret = data_blob(data.data, data.length);
78 parse a negTokenInit packet giving a GUID, a list of supported
79 OIDs (the mechanisms) and a principal name string
81 BOOL spnego_parse_negTokenInit(DATA_BLOB blob,
83 char *OIDs[ASN1_MAX_OIDS],
90 asn1_load(&data, blob);
92 asn1_read(&data, guid, 16);
93 asn1_start_tag(&data,ASN1_APPLICATION(0));
94 asn1_check_OID(&data,OID_SPNEGO);
95 asn1_start_tag(&data,ASN1_CONTEXT(0));
96 asn1_start_tag(&data,ASN1_SEQUENCE(0));
98 asn1_start_tag(&data,ASN1_CONTEXT(0));
99 asn1_start_tag(&data,ASN1_SEQUENCE(0));
100 for (i=0; asn1_tag_remaining(&data) > 0 && i < ASN1_MAX_OIDS; i++) {
102 asn1_read_OID(&data,&oid);
109 asn1_start_tag(&data, ASN1_CONTEXT(3));
110 asn1_start_tag(&data, ASN1_SEQUENCE(0));
111 asn1_start_tag(&data, ASN1_CONTEXT(0));
112 asn1_read_GeneralString(&data,principal);
122 ret = !data.has_error;
129 generate a negTokenTarg packet given a list of OIDs and a security blob
131 DATA_BLOB gen_negTokenTarg(const char *OIDs[], DATA_BLOB blob)
137 memset(&data, 0, sizeof(data));
139 asn1_push_tag(&data, ASN1_APPLICATION(0));
140 asn1_write_OID(&data,OID_SPNEGO);
141 asn1_push_tag(&data, ASN1_CONTEXT(0));
142 asn1_push_tag(&data, ASN1_SEQUENCE(0));
144 asn1_push_tag(&data, ASN1_CONTEXT(0));
145 asn1_push_tag(&data, ASN1_SEQUENCE(0));
146 for (i=0; OIDs[i]; i++) {
147 asn1_write_OID(&data,OIDs[i]);
152 asn1_push_tag(&data, ASN1_CONTEXT(2));
153 asn1_write_OctetString(&data,blob.data,blob.length);
161 if (data.has_error) {
162 DEBUG(1,("Failed to build negTokenTarg at offset %d\n", (int)data.ofs));
166 ret = data_blob(data.data, data.length);
174 parse a negTokenTarg packet giving a list of OIDs and a security blob
176 BOOL parse_negTokenTarg(DATA_BLOB blob, char *OIDs[ASN1_MAX_OIDS], DATA_BLOB *secblob)
181 asn1_load(&data, blob);
182 asn1_start_tag(&data, ASN1_APPLICATION(0));
183 asn1_check_OID(&data,OID_SPNEGO);
184 asn1_start_tag(&data, ASN1_CONTEXT(0));
185 asn1_start_tag(&data, ASN1_SEQUENCE(0));
187 asn1_start_tag(&data, ASN1_CONTEXT(0));
188 asn1_start_tag(&data, ASN1_SEQUENCE(0));
189 for (i=0; asn1_tag_remaining(&data) > 0 && i < ASN1_MAX_OIDS; i++) {
191 asn1_read_OID(&data,&oid);
198 asn1_start_tag(&data, ASN1_CONTEXT(2));
199 asn1_read_OctetString(&data,secblob);
207 if (data.has_error) {
208 DEBUG(1,("Failed to parse negTokenTarg at offset %d\n", (int)data.ofs));
218 generate a krb5 GSS-API wrapper packet given a ticket
220 static DATA_BLOB spnego_gen_krb5_wrap(DATA_BLOB ticket)
225 memset(&data, 0, sizeof(data));
227 asn1_push_tag(&data, ASN1_APPLICATION(0));
228 asn1_write_OID(&data, OID_KERBEROS5);
229 asn1_write_BOOLEAN(&data, 0);
230 asn1_write(&data, ticket.data, ticket.length);
233 if (data.has_error) {
234 DEBUG(1,("Failed to build krb5 wrapper at offset %d\n", (int)data.ofs));
238 ret = data_blob(data.data, data.length);
245 parse a krb5 GSS-API wrapper packet giving a ticket
247 BOOL spnego_parse_krb5_wrap(DATA_BLOB blob, DATA_BLOB *ticket)
252 asn1_load(&data, blob);
253 asn1_start_tag(&data, ASN1_APPLICATION(0));
254 asn1_check_OID(&data, OID_KERBEROS5);
255 asn1_check_BOOLEAN(&data, 0);
256 *ticket = data_blob(data.data, asn1_tag_remaining(&data));
257 asn1_read(&data, ticket->data, ticket->length);
260 ret = !data.has_error;
269 generate a SPNEGO negTokenTarg packet, ready for a EXTENDED_SECURITY
270 kerberos session setup
272 DATA_BLOB spnego_gen_negTokenTarg(struct cli_state *cli, char *principal)
274 DATA_BLOB tkt, tkt_wrapped, targ;
275 const char *krb_mechs[] = {OID_KERBEROS5_OLD, OID_NTLMSSP, NULL};
277 /* get a kerberos ticket for the service */
278 tkt = krb5_get_ticket(principal);
280 /* wrap that up in a nice GSS-API wrapping */
281 tkt_wrapped = spnego_gen_krb5_wrap(tkt);
283 /* and wrap that in a shiny SPNEGO wrapper */
284 targ = gen_negTokenTarg(krb_mechs, tkt_wrapped);
286 data_blob_free(&tkt_wrapped);
287 data_blob_free(&tkt);
294 parse a spnego NTLMSSP challenge packet giving two security blobs
296 BOOL spnego_parse_challenge(DATA_BLOB blob,
297 DATA_BLOB *chal1, DATA_BLOB *chal2)
305 asn1_load(&data, blob);
306 asn1_start_tag(&data,ASN1_CONTEXT(1));
307 asn1_start_tag(&data,ASN1_SEQUENCE(0));
309 asn1_start_tag(&data,ASN1_CONTEXT(0));
310 asn1_check_enumerated(&data,1);
313 asn1_start_tag(&data,ASN1_CONTEXT(1));
314 asn1_check_OID(&data, OID_NTLMSSP);
317 asn1_start_tag(&data,ASN1_CONTEXT(2));
318 asn1_read_OctetString(&data, chal1);
321 /* the second challenge is optional (XP doesn't send it) */
322 if (asn1_tag_remaining(&data)) {
323 asn1_start_tag(&data,ASN1_CONTEXT(3));
324 asn1_read_OctetString(&data, chal2);
331 ret = !data.has_error;
338 generate a spnego NTLMSSP challenge packet given two security blobs
339 The second challenge is optional
341 BOOL spnego_gen_challenge(DATA_BLOB *blob,
342 DATA_BLOB *chal1, DATA_BLOB *chal2)
348 asn1_push_tag(&data,ASN1_CONTEXT(1));
349 asn1_push_tag(&data,ASN1_SEQUENCE(0));
351 asn1_push_tag(&data,ASN1_CONTEXT(0));
352 asn1_write_enumerated(&data,1);
355 asn1_push_tag(&data,ASN1_CONTEXT(1));
356 asn1_write_OID(&data, OID_NTLMSSP);
359 asn1_push_tag(&data,ASN1_CONTEXT(2));
360 asn1_write_OctetString(&data, chal1->data, chal1->length);
363 /* the second challenge is optional (XP doesn't send it) */
365 asn1_push_tag(&data,ASN1_CONTEXT(3));
366 asn1_write_OctetString(&data, chal2->data, chal2->length);
373 if (data.has_error) {
377 *blob = data_blob(data.data, data.length);
383 generate a SPNEGO NTLMSSP auth packet. This will contain the encrypted passwords
385 DATA_BLOB spnego_gen_auth(DATA_BLOB blob)
390 memset(&data, 0, sizeof(data));
392 asn1_push_tag(&data, ASN1_CONTEXT(1));
393 asn1_push_tag(&data, ASN1_SEQUENCE(0));
394 asn1_push_tag(&data, ASN1_CONTEXT(2));
395 asn1_write_OctetString(&data,blob.data,blob.length);
400 ret = data_blob(data.data, data.length);
408 parse a SPNEGO NTLMSSP auth packet. This contains the encrypted passwords
410 BOOL spnego_parse_auth(DATA_BLOB blob, DATA_BLOB *auth)
414 asn1_load(&data, blob);
415 asn1_start_tag(&data, ASN1_CONTEXT(1));
416 asn1_start_tag(&data, ASN1_SEQUENCE(0));
417 asn1_start_tag(&data, ASN1_CONTEXT(2));
418 asn1_read_OctetString(&data,auth);
423 if (data.has_error) {
424 DEBUG(3,("spnego_parse_auth failed at %d\n", (int)data.ofs));
435 this is a tiny msrpc packet generator. I am only using this to
436 avoid tying this code to a particular varient of our rpc code. This
437 generator is not general enough for all our rpc needs, its just
438 enough for the spnego/ntlmssp code
440 format specifiers are:
442 U = unicode string (input is unix string)
443 B = data blob (pointer + length)
444 b = data blob in header (pointer + length)
446 C = constant ascii string
448 BOOL msrpc_gen(DATA_BLOB *blob,
449 const char *format, ...)
455 int head_size=0, data_size=0;
456 int head_ofs, data_ofs;
458 /* first scan the format to work out the header and body size */
459 va_start(ap, format);
460 for (i=0; format[i]; i++) {
463 s = va_arg(ap, char *);
465 data_size += str_charnum(s) * 2;
468 b = va_arg(ap, uint8 *);
470 data_size += va_arg(ap, int);
473 b = va_arg(ap, uint8 *);
474 head_size += va_arg(ap, int);
481 s = va_arg(ap, char *);
482 head_size += str_charnum(s) + 1;
488 /* allocate the space, then scan the format again to fill in the values */
489 blob->data = malloc(head_size + data_size);
490 blob->length = head_size + data_size;
491 if (!blob->data) return False;
494 data_ofs = head_size;
496 va_start(ap, format);
497 for (i=0; format[i]; i++) {
500 s = va_arg(ap, char *);
502 SSVAL(blob->data, head_ofs, n*2); head_ofs += 2;
503 SSVAL(blob->data, head_ofs, n*2); head_ofs += 2;
504 SIVAL(blob->data, head_ofs, data_ofs); head_ofs += 4;
505 push_string(NULL, blob->data+data_ofs, s, n*2, STR_UNICODE|STR_NOALIGN);
509 b = va_arg(ap, uint8 *);
511 SSVAL(blob->data, head_ofs, n); head_ofs += 2;
512 SSVAL(blob->data, head_ofs, n); head_ofs += 2;
513 SIVAL(blob->data, head_ofs, data_ofs); head_ofs += 4;
514 memcpy(blob->data+data_ofs, b, n);
519 SIVAL(blob->data, head_ofs, n); head_ofs += 4;
522 b = va_arg(ap, uint8 *);
524 memcpy(blob->data + head_ofs, b, n);
528 s = va_arg(ap, char *);
529 head_ofs += push_string(NULL, blob->data+head_ofs, s, -1,
530 STR_ASCII|STR_TERMINATE);
541 this is a tiny msrpc packet parser. This the the partner of msrpc_gen
543 format specifiers are:
545 U = unicode string (input is unix string)
547 b = data blob in header
549 C = constant ascii string
551 BOOL msrpc_parse(DATA_BLOB *blob,
552 const char *format, ...)
564 va_start(ap, format);
565 for (i=0; format[i]; i++) {
568 len1 = SVAL(blob->data, head_ofs); head_ofs += 2;
569 len2 = SVAL(blob->data, head_ofs); head_ofs += 2;
570 ptr = IVAL(blob->data, head_ofs); head_ofs += 4;
571 /* make sure its in the right format - be strict */
572 if (len1 != len2 || (len1&1) || ptr + len1 > blob->length) {
575 ps = va_arg(ap, char **);
576 pull_string(NULL, p, blob->data + ptr, -1, len1,
577 STR_UNICODE|STR_NOALIGN);
581 len1 = SVAL(blob->data, head_ofs); head_ofs += 2;
582 len2 = SVAL(blob->data, head_ofs); head_ofs += 2;
583 ptr = IVAL(blob->data, head_ofs); head_ofs += 4;
584 /* make sure its in the right format - be strict */
585 if (len1 != len2 || ptr + len1 > blob->length) {
588 b = (DATA_BLOB *)va_arg(ap, void *);
589 *b = data_blob(blob->data + ptr, len1);
592 b = (DATA_BLOB *)va_arg(ap, void *);
593 len1 = va_arg(ap, unsigned);
594 *b = data_blob(blob->data + head_ofs, len1);
598 v = va_arg(ap, uint32 *);
599 *v = IVAL(blob->data, head_ofs); head_ofs += 4;
602 s = va_arg(ap, char *);
603 head_ofs += pull_string(NULL, p, blob->data+head_ofs, -1,
604 blob->length - head_ofs,
605 STR_ASCII|STR_TERMINATE);
606 if (strcmp(s, p) != 0) {