s3:libsmb: s/struct event_context/struct tevent_context
[Samba/gebeck_regimport.git] / source3 / libsmb / clispnego.c
blob9b4f8f9637a2453bf1a2a1776b6ed3983a3e3168
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 Copyright (C) Jeremy Allison 2010
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 3 of the License, or
12 (at your option) any later version.
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.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "includes.h"
24 #include "../libcli/auth/spnego.h"
25 #include "smb_krb5.h"
26 #include "../lib/util/asn1.h"
29 generate a negTokenInit packet given a list of supported
30 OIDs (the mechanisms) a blob, and a principal name string
33 DATA_BLOB spnego_gen_negTokenInit(TALLOC_CTX *ctx,
34 const char *OIDs[],
35 DATA_BLOB *psecblob,
36 const char *principal)
38 int i;
39 ASN1_DATA *data;
40 DATA_BLOB ret;
42 data = asn1_init(talloc_tos());
43 if (data == NULL) {
44 return data_blob_null;
47 asn1_push_tag(data,ASN1_APPLICATION(0));
48 asn1_write_OID(data,OID_SPNEGO);
49 asn1_push_tag(data,ASN1_CONTEXT(0));
50 asn1_push_tag(data,ASN1_SEQUENCE(0));
52 asn1_push_tag(data,ASN1_CONTEXT(0));
53 asn1_push_tag(data,ASN1_SEQUENCE(0));
54 for (i=0; OIDs[i]; i++) {
55 asn1_write_OID(data,OIDs[i]);
57 asn1_pop_tag(data);
58 asn1_pop_tag(data);
60 if (psecblob && psecblob->length && psecblob->data) {
61 asn1_push_tag(data, ASN1_CONTEXT(2));
62 asn1_write_OctetString(data,psecblob->data,
63 psecblob->length);
64 asn1_pop_tag(data);
67 if (principal) {
68 asn1_push_tag(data, ASN1_CONTEXT(3));
69 asn1_push_tag(data, ASN1_SEQUENCE(0));
70 asn1_push_tag(data, ASN1_CONTEXT(0));
71 asn1_write_GeneralString(data,principal);
72 asn1_pop_tag(data);
73 asn1_pop_tag(data);
74 asn1_pop_tag(data);
77 asn1_pop_tag(data);
78 asn1_pop_tag(data);
80 asn1_pop_tag(data);
82 if (data->has_error) {
83 DEBUG(1,("Failed to build negTokenInit at offset %d\n", (int)data->ofs));
86 ret = data_blob_talloc(ctx, data->data, data->length);
87 asn1_free(data);
89 return ret;
93 parse a negTokenInit packet giving a GUID, a list of supported
94 OIDs (the mechanisms) and a principal name string
96 bool spnego_parse_negTokenInit(TALLOC_CTX *ctx,
97 DATA_BLOB blob,
98 char *OIDs[ASN1_MAX_OIDS],
99 char **principal,
100 DATA_BLOB *secblob)
102 int i;
103 bool ret;
104 ASN1_DATA *data;
106 for (i = 0; i < ASN1_MAX_OIDS; i++) {
107 OIDs[i] = NULL;
110 data = asn1_init(talloc_tos());
111 if (data == NULL) {
112 return false;
115 asn1_load(data, blob);
117 asn1_start_tag(data,ASN1_APPLICATION(0));
119 asn1_check_OID(data,OID_SPNEGO);
121 /* negTokenInit [0] NegTokenInit */
122 asn1_start_tag(data,ASN1_CONTEXT(0));
123 asn1_start_tag(data,ASN1_SEQUENCE(0));
125 /* mechTypes [0] MechTypeList OPTIONAL */
127 /* Not really optional, we depend on this to decide
128 * what mechanisms we have to work with. */
130 asn1_start_tag(data,ASN1_CONTEXT(0));
131 asn1_start_tag(data,ASN1_SEQUENCE(0));
132 for (i=0; asn1_tag_remaining(data) > 0 && i < ASN1_MAX_OIDS-1; i++) {
133 if (!asn1_read_OID(data,ctx, &OIDs[i])) {
134 break;
136 if (data->has_error) {
137 break;
140 OIDs[i] = NULL;
141 asn1_end_tag(data);
142 asn1_end_tag(data);
144 if (principal) {
145 *principal = NULL;
147 if (secblob) {
148 *secblob = data_blob_null;
152 Win7 + Live Sign-in Assistant attaches a mechToken
153 ASN1_CONTEXT(2) to the negTokenInit packet
154 which breaks our negotiation if we just assume
155 the next tag is ASN1_CONTEXT(3).
158 if (asn1_peek_tag(data, ASN1_CONTEXT(1))) {
159 uint8 flags;
161 /* reqFlags [1] ContextFlags OPTIONAL */
162 asn1_start_tag(data, ASN1_CONTEXT(1));
163 asn1_start_tag(data, ASN1_BIT_STRING);
164 while (asn1_tag_remaining(data) > 0) {
165 asn1_read_uint8(data, &flags);
167 asn1_end_tag(data);
168 asn1_end_tag(data);
171 if (asn1_peek_tag(data, ASN1_CONTEXT(2))) {
172 DATA_BLOB sblob = data_blob_null;
173 /* mechToken [2] OCTET STRING OPTIONAL */
174 asn1_start_tag(data, ASN1_CONTEXT(2));
175 asn1_read_OctetString(data, ctx, &sblob);
176 asn1_end_tag(data);
177 if (secblob) {
178 *secblob = sblob;
179 } else {
180 data_blob_free(&sblob);
184 if (asn1_peek_tag(data, ASN1_CONTEXT(3))) {
185 char *princ = NULL;
186 /* mechListMIC [3] OCTET STRING OPTIONAL */
187 asn1_start_tag(data, ASN1_CONTEXT(3));
188 asn1_start_tag(data, ASN1_SEQUENCE(0));
189 asn1_start_tag(data, ASN1_CONTEXT(0));
190 asn1_read_GeneralString(data, ctx, &princ);
191 asn1_end_tag(data);
192 asn1_end_tag(data);
193 asn1_end_tag(data);
194 if (principal) {
195 *principal = princ;
196 } else {
197 TALLOC_FREE(princ);
201 asn1_end_tag(data);
202 asn1_end_tag(data);
204 asn1_end_tag(data);
206 ret = !data->has_error;
207 if (data->has_error) {
208 int j;
209 if (principal) {
210 TALLOC_FREE(*principal);
212 if (secblob) {
213 data_blob_free(secblob);
215 for(j = 0; j < i && j < ASN1_MAX_OIDS-1; j++) {
216 TALLOC_FREE(OIDs[j]);
220 asn1_free(data);
221 return ret;
225 generate a krb5 GSS-API wrapper packet given a ticket
227 DATA_BLOB spnego_gen_krb5_wrap(TALLOC_CTX *ctx, const DATA_BLOB ticket, const uint8 tok_id[2])
229 ASN1_DATA *data;
230 DATA_BLOB ret;
232 data = asn1_init(talloc_tos());
233 if (data == NULL) {
234 return data_blob_null;
237 asn1_push_tag(data, ASN1_APPLICATION(0));
238 asn1_write_OID(data, OID_KERBEROS5);
240 asn1_write(data, tok_id, 2);
241 asn1_write(data, ticket.data, ticket.length);
242 asn1_pop_tag(data);
244 if (data->has_error) {
245 DEBUG(1,("Failed to build krb5 wrapper at offset %d\n", (int)data->ofs));
248 ret = data_blob_talloc(ctx, data->data, data->length);
249 asn1_free(data);
251 return ret;
255 generate a SPNEGO krb5 negTokenInit packet, ready for a EXTENDED_SECURITY
256 kerberos session setup
258 int spnego_gen_krb5_negTokenInit(TALLOC_CTX *ctx,
259 const char *principal, int time_offset,
260 DATA_BLOB *targ,
261 DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
262 const char *ccname, time_t *expire_time)
264 int retval;
265 DATA_BLOB tkt, tkt_wrapped;
266 const char *krb_mechs[] = {OID_KERBEROS5_OLD, OID_KERBEROS5, OID_NTLMSSP, NULL};
268 /* get a kerberos ticket for the service and extract the session key */
269 retval = cli_krb5_get_ticket(ctx, principal, time_offset,
270 &tkt, session_key_krb5,
271 extra_ap_opts, ccname,
272 expire_time, NULL);
273 if (retval) {
274 return retval;
277 /* wrap that up in a nice GSS-API wrapping */
278 tkt_wrapped = spnego_gen_krb5_wrap(ctx, tkt, TOK_ID_KRB_AP_REQ);
280 /* and wrap that in a shiny SPNEGO wrapper */
281 *targ = spnego_gen_negTokenInit(ctx, krb_mechs, &tkt_wrapped, NULL);
283 data_blob_free(&tkt_wrapped);
284 data_blob_free(&tkt);
286 return retval;
291 parse a spnego NTLMSSP challenge packet giving two security blobs
293 bool spnego_parse_challenge(TALLOC_CTX *ctx, const DATA_BLOB blob,
294 DATA_BLOB *chal1, DATA_BLOB *chal2)
296 bool ret;
297 ASN1_DATA *data;
299 ZERO_STRUCTP(chal1);
300 ZERO_STRUCTP(chal2);
302 data = asn1_init(talloc_tos());
303 if (data == NULL) {
304 return false;
307 asn1_load(data, blob);
308 asn1_start_tag(data,ASN1_CONTEXT(1));
309 asn1_start_tag(data,ASN1_SEQUENCE(0));
311 asn1_start_tag(data,ASN1_CONTEXT(0));
312 asn1_check_enumerated(data,1);
313 asn1_end_tag(data);
315 asn1_start_tag(data,ASN1_CONTEXT(1));
316 asn1_check_OID(data, OID_NTLMSSP);
317 asn1_end_tag(data);
319 asn1_start_tag(data,ASN1_CONTEXT(2));
320 asn1_read_OctetString(data, ctx, chal1);
321 asn1_end_tag(data);
323 /* the second challenge is optional (XP doesn't send it) */
324 if (asn1_tag_remaining(data)) {
325 asn1_start_tag(data,ASN1_CONTEXT(3));
326 asn1_read_OctetString(data, ctx, chal2);
327 asn1_end_tag(data);
330 asn1_end_tag(data);
331 asn1_end_tag(data);
333 ret = !data->has_error;
335 if (data->has_error) {
336 data_blob_free(chal1);
337 data_blob_free(chal2);
340 asn1_free(data);
341 return ret;
346 generate a SPNEGO auth packet. This will contain the encrypted passwords
348 DATA_BLOB spnego_gen_auth(TALLOC_CTX *ctx, DATA_BLOB blob)
350 ASN1_DATA *data;
351 DATA_BLOB ret;
353 data = asn1_init(talloc_tos());
354 if (data == NULL) {
355 return data_blob_null;
358 asn1_push_tag(data, ASN1_CONTEXT(1));
359 asn1_push_tag(data, ASN1_SEQUENCE(0));
360 asn1_push_tag(data, ASN1_CONTEXT(2));
361 asn1_write_OctetString(data,blob.data,blob.length);
362 asn1_pop_tag(data);
363 asn1_pop_tag(data);
364 asn1_pop_tag(data);
366 ret = data_blob_talloc(ctx, data->data, data->length);
368 asn1_free(data);
370 return ret;
374 parse a SPNEGO auth packet. This contains the encrypted passwords
376 bool spnego_parse_auth_response(TALLOC_CTX *ctx,
377 DATA_BLOB blob, NTSTATUS nt_status,
378 const char *mechOID,
379 DATA_BLOB *auth)
381 ASN1_DATA *data;
382 uint8 negResult;
384 if (NT_STATUS_IS_OK(nt_status)) {
385 negResult = SPNEGO_ACCEPT_COMPLETED;
386 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
387 negResult = SPNEGO_ACCEPT_INCOMPLETE;
388 } else {
389 negResult = SPNEGO_REJECT;
392 data = asn1_init(talloc_tos());
393 if (data == NULL) {
394 return false;
397 asn1_load(data, blob);
398 asn1_start_tag(data, ASN1_CONTEXT(1));
399 asn1_start_tag(data, ASN1_SEQUENCE(0));
400 asn1_start_tag(data, ASN1_CONTEXT(0));
401 asn1_check_enumerated(data, negResult);
402 asn1_end_tag(data);
404 *auth = data_blob_null;
406 if (asn1_tag_remaining(data)) {
407 asn1_start_tag(data,ASN1_CONTEXT(1));
408 asn1_check_OID(data, mechOID);
409 asn1_end_tag(data);
411 if (asn1_tag_remaining(data)) {
412 asn1_start_tag(data,ASN1_CONTEXT(2));
413 asn1_read_OctetString(data, ctx, auth);
414 asn1_end_tag(data);
416 } else if (negResult == SPNEGO_ACCEPT_INCOMPLETE) {
417 data->has_error = 1;
420 /* Binding against Win2K DC returns a duplicate of the responseToken in
421 * the optional mechListMIC field. This is a bug in Win2K. We ignore
422 * this field if it exists. Win2K8 may return a proper mechListMIC at
423 * which point we need to implement the integrity checking. */
424 if (asn1_tag_remaining(data)) {
425 DATA_BLOB mechList = data_blob_null;
426 asn1_start_tag(data, ASN1_CONTEXT(3));
427 asn1_read_OctetString(data, ctx, &mechList);
428 asn1_end_tag(data);
429 data_blob_free(&mechList);
430 DEBUG(5,("spnego_parse_auth_response received mechListMIC, "
431 "ignoring.\n"));
434 asn1_end_tag(data);
435 asn1_end_tag(data);
437 if (data->has_error) {
438 DEBUG(3,("spnego_parse_auth_response failed at %d\n", (int)data->ofs));
439 asn1_free(data);
440 data_blob_free(auth);
441 return False;
444 asn1_free(data);
445 return True;