2 Unix SMB/CIFS implementation.
3 simple kerberos5/SPNEGO routines
4 Copyright (C) Andrew Tridgell 2001
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 generate a negTokenInit packet given a GUID, a list of supported
25 OIDs (the mechanisms) and a principal name string
27 DATA_BLOB spnego_gen_negTokenInit(uint8 guid[16],
29 const char *principal)
35 memset(&data, 0, sizeof(data));
37 asn1_write(&data, guid, 16);
38 asn1_push_tag(&data,ASN1_APPLICATION(0));
39 asn1_write_OID(&data,OID_SPNEGO);
40 asn1_push_tag(&data,ASN1_CONTEXT(0));
41 asn1_push_tag(&data,ASN1_SEQUENCE(0));
43 asn1_push_tag(&data,ASN1_CONTEXT(0));
44 asn1_push_tag(&data,ASN1_SEQUENCE(0));
45 for (i=0; OIDs[i]; i++) {
46 asn1_write_OID(&data,OIDs[i]);
51 asn1_push_tag(&data, ASN1_CONTEXT(3));
52 asn1_push_tag(&data, ASN1_SEQUENCE(0));
53 asn1_push_tag(&data, ASN1_CONTEXT(0));
54 asn1_write_GeneralString(&data,principal);
65 DEBUG(1,("Failed to build negTokenInit at offset %d\n", (int)data.ofs));
69 ret = data_blob(data.data, data.length);
77 parse a negTokenInit packet giving a GUID, a list of supported
78 OIDs (the mechanisms) and a principal name string
80 BOOL spnego_parse_negTokenInit(DATA_BLOB blob,
82 char *OIDs[ASN1_MAX_OIDS],
89 asn1_load(&data, blob);
91 asn1_read(&data, guid, 16);
92 asn1_start_tag(&data,ASN1_APPLICATION(0));
93 asn1_check_OID(&data,OID_SPNEGO);
94 asn1_start_tag(&data,ASN1_CONTEXT(0));
95 asn1_start_tag(&data,ASN1_SEQUENCE(0));
97 asn1_start_tag(&data,ASN1_CONTEXT(0));
98 asn1_start_tag(&data,ASN1_SEQUENCE(0));
99 for (i=0; asn1_tag_remaining(&data) > 0 && i < ASN1_MAX_OIDS; i++) {
101 asn1_read_OID(&data,&oid);
108 asn1_start_tag(&data, ASN1_CONTEXT(3));
109 asn1_start_tag(&data, ASN1_SEQUENCE(0));
110 asn1_start_tag(&data, ASN1_CONTEXT(0));
111 asn1_read_GeneralString(&data,principal);
121 ret = !data.has_error;
128 generate a negTokenTarg packet given a list of OIDs and a security blob
130 DATA_BLOB gen_negTokenTarg(const char *OIDs[], DATA_BLOB blob)
136 memset(&data, 0, sizeof(data));
138 asn1_push_tag(&data, ASN1_APPLICATION(0));
139 asn1_write_OID(&data,OID_SPNEGO);
140 asn1_push_tag(&data, ASN1_CONTEXT(0));
141 asn1_push_tag(&data, ASN1_SEQUENCE(0));
143 asn1_push_tag(&data, ASN1_CONTEXT(0));
144 asn1_push_tag(&data, ASN1_SEQUENCE(0));
145 for (i=0; OIDs[i]; i++) {
146 asn1_write_OID(&data,OIDs[i]);
151 asn1_push_tag(&data, ASN1_CONTEXT(2));
152 asn1_write_OctetString(&data,blob.data,blob.length);
160 if (data.has_error) {
161 DEBUG(1,("Failed to build negTokenTarg at offset %d\n", (int)data.ofs));
165 ret = data_blob(data.data, data.length);
173 parse a negTokenTarg packet giving a list of OIDs and a security blob
175 BOOL parse_negTokenTarg(DATA_BLOB blob, char *OIDs[ASN1_MAX_OIDS], DATA_BLOB *secblob)
180 asn1_load(&data, blob);
181 asn1_start_tag(&data, ASN1_APPLICATION(0));
182 asn1_check_OID(&data,OID_SPNEGO);
183 asn1_start_tag(&data, ASN1_CONTEXT(0));
184 asn1_start_tag(&data, ASN1_SEQUENCE(0));
186 asn1_start_tag(&data, ASN1_CONTEXT(0));
187 asn1_start_tag(&data, ASN1_SEQUENCE(0));
188 for (i=0; asn1_tag_remaining(&data) > 0 && i < ASN1_MAX_OIDS; i++) {
190 asn1_read_OID(&data,&oid);
197 asn1_start_tag(&data, ASN1_CONTEXT(2));
198 asn1_read_OctetString(&data,secblob);
206 if (data.has_error) {
207 DEBUG(1,("Failed to parse negTokenTarg at offset %d\n", (int)data.ofs));
217 generate a krb5 GSS-API wrapper packet given a ticket
219 DATA_BLOB spnego_gen_krb5_wrap(DATA_BLOB ticket)
224 memset(&data, 0, sizeof(data));
226 asn1_push_tag(&data, ASN1_APPLICATION(0));
227 asn1_write_OID(&data, OID_KERBEROS5);
228 asn1_write_BOOLEAN(&data, 0);
229 asn1_write(&data, ticket.data, ticket.length);
232 if (data.has_error) {
233 DEBUG(1,("Failed to build krb5 wrapper at offset %d\n", (int)data.ofs));
237 ret = data_blob(data.data, data.length);
244 parse a krb5 GSS-API wrapper packet giving a ticket
246 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);
257 data_remaining = asn1_tag_remaining(&data);
259 if (data_remaining < 1) {
260 data.has_error = True;
263 *ticket = data_blob(data.data, data_remaining);
264 asn1_read(&data, ticket->data, ticket->length);
269 ret = !data.has_error;
278 generate a SPNEGO negTokenTarg packet, ready for a EXTENDED_SECURITY
279 kerberos session setup
281 DATA_BLOB spnego_gen_negTokenTarg(struct cli_state *cli, char *principal)
283 DATA_BLOB tkt, tkt_wrapped, targ;
284 const char *krb_mechs[] = {OID_KERBEROS5_OLD, OID_NTLMSSP, NULL};
286 /* get a kerberos ticket for the service */
287 tkt = krb5_get_ticket(principal);
289 /* wrap that up in a nice GSS-API wrapping */
290 tkt_wrapped = spnego_gen_krb5_wrap(tkt);
292 /* and wrap that in a shiny SPNEGO wrapper */
293 targ = gen_negTokenTarg(krb_mechs, tkt_wrapped);
295 data_blob_free(&tkt_wrapped);
296 data_blob_free(&tkt);
303 parse a spnego NTLMSSP challenge packet giving two security blobs
305 BOOL spnego_parse_challenge(DATA_BLOB blob,
306 DATA_BLOB *chal1, DATA_BLOB *chal2)
314 asn1_load(&data, blob);
315 asn1_start_tag(&data,ASN1_CONTEXT(1));
316 asn1_start_tag(&data,ASN1_SEQUENCE(0));
318 asn1_start_tag(&data,ASN1_CONTEXT(0));
319 asn1_check_enumerated(&data,1);
322 asn1_start_tag(&data,ASN1_CONTEXT(1));
323 asn1_check_OID(&data, OID_NTLMSSP);
326 asn1_start_tag(&data,ASN1_CONTEXT(2));
327 asn1_read_OctetString(&data, chal1);
330 /* the second challenge is optional (XP doesn't send it) */
331 if (asn1_tag_remaining(&data)) {
332 asn1_start_tag(&data,ASN1_CONTEXT(3));
333 asn1_read_OctetString(&data, chal2);
340 ret = !data.has_error;
347 generate a spnego NTLMSSP challenge packet given two security blobs
348 The second challenge is optional
350 BOOL spnego_gen_challenge(DATA_BLOB *blob,
351 DATA_BLOB *chal1, DATA_BLOB *chal2)
357 asn1_push_tag(&data,ASN1_CONTEXT(1));
358 asn1_push_tag(&data,ASN1_SEQUENCE(0));
360 asn1_push_tag(&data,ASN1_CONTEXT(0));
361 asn1_write_enumerated(&data,1);
364 asn1_push_tag(&data,ASN1_CONTEXT(1));
365 asn1_write_OID(&data, OID_NTLMSSP);
368 asn1_push_tag(&data,ASN1_CONTEXT(2));
369 asn1_write_OctetString(&data, chal1->data, chal1->length);
372 /* the second challenge is optional (XP doesn't send it) */
374 asn1_push_tag(&data,ASN1_CONTEXT(3));
375 asn1_write_OctetString(&data, chal2->data, chal2->length);
382 if (data.has_error) {
386 *blob = data_blob(data.data, data.length);
392 generate a SPNEGO NTLMSSP auth packet. This will contain the encrypted passwords
394 DATA_BLOB spnego_gen_auth(DATA_BLOB blob)
399 memset(&data, 0, sizeof(data));
401 asn1_push_tag(&data, ASN1_CONTEXT(1));
402 asn1_push_tag(&data, ASN1_SEQUENCE(0));
403 asn1_push_tag(&data, ASN1_CONTEXT(2));
404 asn1_write_OctetString(&data,blob.data,blob.length);
409 ret = data_blob(data.data, data.length);
417 parse a SPNEGO NTLMSSP auth packet. This contains the encrypted passwords
419 BOOL spnego_parse_auth(DATA_BLOB blob, DATA_BLOB *auth)
423 asn1_load(&data, blob);
424 asn1_start_tag(&data, ASN1_CONTEXT(1));
425 asn1_start_tag(&data, ASN1_SEQUENCE(0));
426 asn1_start_tag(&data, ASN1_CONTEXT(2));
427 asn1_read_OctetString(&data,auth);
432 if (data.has_error) {
433 DEBUG(3,("spnego_parse_auth failed at %d\n", (int)data.ofs));
444 this is a tiny msrpc packet generator. I am only using this to
445 avoid tying this code to a particular varient of our rpc code. This
446 generator is not general enough for all our rpc needs, its just
447 enough for the spnego/ntlmssp code
449 format specifiers are:
451 U = unicode string (input is unix string)
452 B = data blob (pointer + length)
453 b = data blob in header (pointer + length)
455 C = constant ascii string
457 BOOL msrpc_gen(DATA_BLOB *blob,
458 const char *format, ...)
464 int head_size=0, data_size=0;
465 int head_ofs, data_ofs;
467 /* first scan the format to work out the header and body size */
468 va_start(ap, format);
469 for (i=0; format[i]; i++) {
472 s = va_arg(ap, char *);
474 data_size += str_charnum(s) * 2;
477 b = va_arg(ap, uint8 *);
479 data_size += va_arg(ap, int);
482 b = va_arg(ap, uint8 *);
483 head_size += va_arg(ap, int);
490 s = va_arg(ap, char *);
491 head_size += str_charnum(s) + 1;
497 /* allocate the space, then scan the format again to fill in the values */
498 *blob = data_blob(NULL, head_size + data_size);
501 data_ofs = head_size;
503 va_start(ap, format);
504 for (i=0; format[i]; i++) {
507 s = va_arg(ap, char *);
509 SSVAL(blob->data, head_ofs, n*2); head_ofs += 2;
510 SSVAL(blob->data, head_ofs, n*2); head_ofs += 2;
511 SIVAL(blob->data, head_ofs, data_ofs); head_ofs += 4;
512 push_string(NULL, blob->data+data_ofs, s, n*2, STR_UNICODE|STR_NOALIGN);
516 b = va_arg(ap, uint8 *);
518 SSVAL(blob->data, head_ofs, n); head_ofs += 2;
519 SSVAL(blob->data, head_ofs, n); head_ofs += 2;
520 SIVAL(blob->data, head_ofs, data_ofs); head_ofs += 4;
521 memcpy(blob->data+data_ofs, b, n);
526 SIVAL(blob->data, head_ofs, n); head_ofs += 4;
529 b = va_arg(ap, uint8 *);
531 memcpy(blob->data + head_ofs, b, n);
535 s = va_arg(ap, char *);
536 head_ofs += push_string(NULL, blob->data+head_ofs, s, -1,
537 STR_ASCII|STR_TERMINATE);
548 this is a tiny msrpc packet parser. This the the partner of msrpc_gen
550 format specifiers are:
552 U = unicode string (output is unix string)
554 b = data blob in header
556 C = constant ascii string
558 BOOL msrpc_parse(DATA_BLOB *blob,
559 const char *format, ...)
571 va_start(ap, format);
572 for (i=0; format[i]; i++) {
575 len1 = SVAL(blob->data, head_ofs); head_ofs += 2;
576 len2 = SVAL(blob->data, head_ofs); head_ofs += 2;
577 ptr = IVAL(blob->data, head_ofs); head_ofs += 4;
578 /* make sure its in the right format - be strict */
579 if (len1 != len2 || (len1&1) || ptr + len1 > blob->length) {
582 ps = va_arg(ap, char **);
583 pull_string(NULL, p, blob->data + ptr, -1, len1,
584 STR_UNICODE|STR_NOALIGN);
588 len1 = SVAL(blob->data, head_ofs); head_ofs += 2;
589 len2 = SVAL(blob->data, head_ofs); head_ofs += 2;
590 ptr = IVAL(blob->data, head_ofs); head_ofs += 4;
591 /* make sure its in the right format - be strict */
592 if (len1 != len2 || ptr + len1 > blob->length) {
595 b = (DATA_BLOB *)va_arg(ap, void *);
596 *b = data_blob(blob->data + ptr, len1);
599 b = (DATA_BLOB *)va_arg(ap, void *);
600 len1 = va_arg(ap, unsigned);
601 *b = data_blob(blob->data + head_ofs, len1);
605 v = va_arg(ap, uint32 *);
606 *v = IVAL(blob->data, head_ofs); head_ofs += 4;
609 s = va_arg(ap, char *);
610 head_ofs += pull_string(NULL, p, blob->data+head_ofs, -1,
611 blob->length - head_ofs,
612 STR_ASCII|STR_TERMINATE);
613 if (strcmp(s, p) != 0) {
625 * Print out the NTLMSSP flags for debugging
628 void debug_ntlmssp_flags(uint32 neg_flags)
630 if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE)
631 DEBUG(4, (" NTLMSSP_NEGOTIATE_UNICODE\n"));
632 if (neg_flags & NTLMSSP_NEGOTIATE_OEM)
633 DEBUG(4, (" NTLMSSP_NEGOTIATE_OEM\n"));
634 if (neg_flags & NTLMSSP_REQUEST_TARGET)
635 DEBUG(4, (" NTLMSSP_REQUEST_TARGET\n"));
636 if (neg_flags & NTLMSSP_NEGOTIATE_SIGN)
637 DEBUG(4, (" NTLMSSP_NEGOTIATE_SIGN\n"));
638 if (neg_flags & NTLMSSP_NEGOTIATE_SIGN)
639 DEBUG(4, (" NTLMSSP_NEGOTIATE_SEAL\n"));
640 if (neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
641 DEBUG(4, (" NTLMSSP_NEGOTIATE_LM_KEY\n"));
642 if (neg_flags & NTLMSSP_NEGOTIATE_NETWARE)
643 DEBUG(4, (" NTLMSSP_NEGOTIATE_NETWARE\n"));
644 if (neg_flags & NTLMSSP_NEGOTIATE_NTLM)
645 DEBUG(4, (" NTLMSSP_NEGOTIATE_NTLM\n"));
646 if (neg_flags & NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED)
647 DEBUG(4, (" NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED\n"));
648 if (neg_flags & NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED)
649 DEBUG(4, (" NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED\n"));
650 if (neg_flags & NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL)
651 DEBUG(4, (" NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL\n"));
652 if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
653 DEBUG(4, (" NTLMSSP_NEGOTIATE_ALWAYS_SIGN\n"));
654 if (neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
655 DEBUG(4, (" NTLMSSP_NEGOTIATE_NTLM2\n"));
656 if (neg_flags & NTLMSSP_CHAL_TARGET_INFO)
657 DEBUG(4, (" NTLMSSP_CHAL_TARGET_INFO\n"));
658 if (neg_flags & NTLMSSP_NEGOTIATE_128)
659 DEBUG(4, (" NTLMSSP_NEGOTIATE_128\n"));
660 if (neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)
661 DEBUG(4, (" NTLMSSP_NEGOTIATE_KEY_EXCH\n"));