2 Unix SMB/CIFS implementation.
4 RFC2478 Compliant SPNEGO implementation
6 Copyright (C) Jim McDonough <jmcd@us.ibm.com> 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 3 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.
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/>.
26 #define DBGC_CLASS DBGC_AUTH
28 static bool read_negTokenInit(ASN1_DATA *asn1, negTokenInit_t *token)
32 asn1_start_tag(asn1, ASN1_CONTEXT(0));
33 asn1_start_tag(asn1, ASN1_SEQUENCE(0));
35 while (!asn1->has_error && 0 < asn1_tag_remaining(asn1)) {
38 switch (asn1->data[asn1->ofs]) {
41 asn1_start_tag(asn1, ASN1_CONTEXT(0));
42 asn1_start_tag(asn1, ASN1_SEQUENCE(0));
44 token->mechTypes = SMB_MALLOC_P(const char *);
45 for (i = 0; !asn1->has_error &&
46 0 < asn1_tag_remaining(asn1); i++) {
49 SMB_REALLOC_ARRAY(token->mechTypes, const char *, i + 2);
50 if (!token->mechTypes) {
51 asn1->has_error = True;
54 asn1_read_OID(asn1, &p_oid);
55 token->mechTypes[i] = p_oid;
57 token->mechTypes[i] = NULL;
64 asn1_start_tag(asn1, ASN1_CONTEXT(1));
65 asn1_read_Integer(asn1, &token->reqFlags);
66 token->reqFlags |= SPNEGO_REQ_FLAG;
71 asn1_start_tag(asn1, ASN1_CONTEXT(2));
72 asn1_read_OctetString(asn1, &token->mechToken);
77 asn1_start_tag(asn1, ASN1_CONTEXT(3));
78 if (asn1->data[asn1->ofs] == ASN1_OCTET_STRING) {
79 asn1_read_OctetString(asn1,
82 /* RFC 2478 says we have an Octet String here,
83 but W2k sends something different... */
85 asn1_push_tag(asn1, ASN1_SEQUENCE(0));
86 asn1_push_tag(asn1, ASN1_CONTEXT(0));
87 asn1_read_GeneralString(asn1, &mechListMIC);
92 data_blob(mechListMIC, strlen(mechListMIC));
93 SAFE_FREE(mechListMIC);
98 asn1->has_error = True;
106 return !asn1->has_error;
109 static bool write_negTokenInit(ASN1_DATA *asn1, negTokenInit_t *token)
111 asn1_push_tag(asn1, ASN1_CONTEXT(0));
112 asn1_push_tag(asn1, ASN1_SEQUENCE(0));
114 /* Write mechTypes */
115 if (token->mechTypes && *token->mechTypes) {
118 asn1_push_tag(asn1, ASN1_CONTEXT(0));
119 asn1_push_tag(asn1, ASN1_SEQUENCE(0));
120 for (i = 0; token->mechTypes[i]; i++) {
121 asn1_write_OID(asn1, token->mechTypes[i]);
128 if (token->reqFlags & SPNEGO_REQ_FLAG) {
129 int flags = token->reqFlags & ~SPNEGO_REQ_FLAG;
131 asn1_push_tag(asn1, ASN1_CONTEXT(1));
132 asn1_write_Integer(asn1, flags);
136 /* write mechToken */
137 if (token->mechToken.data) {
138 asn1_push_tag(asn1, ASN1_CONTEXT(2));
139 asn1_write_OctetString(asn1, token->mechToken.data,
140 token->mechToken.length);
144 /* write mechListMIC */
145 if (token->mechListMIC.data) {
146 asn1_push_tag(asn1, ASN1_CONTEXT(3));
148 /* This is what RFC 2478 says ... */
149 asn1_write_OctetString(asn1, token->mechListMIC.data,
150 token->mechListMIC.length);
152 /* ... but unfortunately this is what Windows
154 asn1_push_tag(asn1, ASN1_SEQUENCE(0));
155 asn1_push_tag(asn1, ASN1_CONTEXT(0));
156 asn1_push_tag(asn1, ASN1_GENERAL_STRING);
157 asn1_write(asn1, token->mechListMIC.data,
158 token->mechListMIC.length);
169 return !asn1->has_error;
172 static bool read_negTokenTarg(ASN1_DATA *asn1, negTokenTarg_t *token)
176 asn1_start_tag(asn1, ASN1_CONTEXT(1));
177 asn1_start_tag(asn1, ASN1_SEQUENCE(0));
179 while (!asn1->has_error && 0 < asn1_tag_remaining(asn1)) {
180 switch (asn1->data[asn1->ofs]) {
181 case ASN1_CONTEXT(0):
182 asn1_start_tag(asn1, ASN1_CONTEXT(0));
183 asn1_start_tag(asn1, ASN1_ENUMERATED);
184 asn1_read_uint8(asn1, &token->negResult);
188 case ASN1_CONTEXT(1):
189 asn1_start_tag(asn1, ASN1_CONTEXT(1));
190 asn1_read_OID(asn1, &token->supportedMech);
193 case ASN1_CONTEXT(2):
194 asn1_start_tag(asn1, ASN1_CONTEXT(2));
195 asn1_read_OctetString(asn1, &token->responseToken);
198 case ASN1_CONTEXT(3):
199 asn1_start_tag(asn1, ASN1_CONTEXT(3));
200 asn1_read_OctetString(asn1, &token->mechListMIC);
204 asn1->has_error = True;
212 return !asn1->has_error;
215 static bool write_negTokenTarg(ASN1_DATA *asn1, negTokenTarg_t *token)
217 asn1_push_tag(asn1, ASN1_CONTEXT(1));
218 asn1_push_tag(asn1, ASN1_SEQUENCE(0));
220 asn1_push_tag(asn1, ASN1_CONTEXT(0));
221 asn1_write_enumerated(asn1, token->negResult);
224 if (token->supportedMech) {
225 asn1_push_tag(asn1, ASN1_CONTEXT(1));
226 asn1_write_OID(asn1, token->supportedMech);
230 if (token->responseToken.data) {
231 asn1_push_tag(asn1, ASN1_CONTEXT(2));
232 asn1_write_OctetString(asn1, token->responseToken.data,
233 token->responseToken.length);
237 if (token->mechListMIC.data) {
238 asn1_push_tag(asn1, ASN1_CONTEXT(3));
239 asn1_write_OctetString(asn1, token->mechListMIC.data,
240 token->mechListMIC.length);
247 return !asn1->has_error;
250 ssize_t read_spnego_data(DATA_BLOB data, SPNEGO_DATA *token)
257 asn1_load(&asn1, data);
259 switch (asn1.data[asn1.ofs]) {
260 case ASN1_APPLICATION(0):
261 asn1_start_tag(&asn1, ASN1_APPLICATION(0));
262 asn1_check_OID(&asn1, OID_SPNEGO);
263 if (read_negTokenInit(&asn1, &token->negTokenInit)) {
264 token->type = SPNEGO_NEG_TOKEN_INIT;
268 case ASN1_CONTEXT(1):
269 if (read_negTokenTarg(&asn1, &token->negTokenTarg)) {
270 token->type = SPNEGO_NEG_TOKEN_TARG;
277 if (!asn1.has_error) ret = asn1.ofs;
283 ssize_t write_spnego_data(DATA_BLOB *blob, SPNEGO_DATA *spnego)
290 switch (spnego->type) {
291 case SPNEGO_NEG_TOKEN_INIT:
292 asn1_push_tag(&asn1, ASN1_APPLICATION(0));
293 asn1_write_OID(&asn1, OID_SPNEGO);
294 write_negTokenInit(&asn1, &spnego->negTokenInit);
297 case SPNEGO_NEG_TOKEN_TARG:
298 write_negTokenTarg(&asn1, &spnego->negTokenTarg);
301 asn1.has_error = True;
305 if (!asn1.has_error) {
306 *blob = data_blob(asn1.data, asn1.length);
314 bool free_spnego_data(SPNEGO_DATA *spnego)
318 if (!spnego) goto out;
320 switch(spnego->type) {
321 case SPNEGO_NEG_TOKEN_INIT:
322 if (spnego->negTokenInit.mechTypes) {
324 for (i = 0; spnego->negTokenInit.mechTypes[i]; i++) {
325 free(CONST_DISCARD(char *,spnego->negTokenInit.mechTypes[i]));
327 free(spnego->negTokenInit.mechTypes);
329 data_blob_free(&spnego->negTokenInit.mechToken);
330 data_blob_free(&spnego->negTokenInit.mechListMIC);
332 case SPNEGO_NEG_TOKEN_TARG:
333 if (spnego->negTokenTarg.supportedMech) {
334 free(spnego->negTokenTarg.supportedMech);
336 data_blob_free(&spnego->negTokenTarg.responseToken);
337 data_blob_free(&spnego->negTokenTarg.mechListMIC);
343 ZERO_STRUCTP(spnego);