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Diffstat (limited to 'source3/libsmb/spnego.c')
-rw-r--r--source3/libsmb/spnego.c343
1 files changed, 343 insertions, 0 deletions
diff --git a/source3/libsmb/spnego.c b/source3/libsmb/spnego.c
new file mode 100644
index 0000000000..50caf7b4c0
--- /dev/null
+++ b/source3/libsmb/spnego.c
@@ -0,0 +1,343 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ RFC2478 Compliant SPNEGO implementation
+
+ Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_AUTH
+
+static BOOL read_negTokenInit(ASN1_DATA *asn1, negTokenInit_t *token)
+{
+ ZERO_STRUCTP(token);
+
+ asn1_start_tag(asn1, ASN1_CONTEXT(0));
+ asn1_start_tag(asn1, ASN1_SEQUENCE(0));
+
+ while (!asn1->has_error && 0 < asn1_tag_remaining(asn1)) {
+ int i;
+
+ switch (asn1->data[asn1->ofs]) {
+ /* Read mechTypes */
+ case ASN1_CONTEXT(0):
+ asn1_start_tag(asn1, ASN1_CONTEXT(0));
+ asn1_start_tag(asn1, ASN1_SEQUENCE(0));
+
+ token->mechTypes = malloc(sizeof(*token->mechTypes));
+ for (i = 0; !asn1->has_error &&
+ 0 < asn1_tag_remaining(asn1); i++) {
+ token->mechTypes =
+ realloc(token->mechTypes, (i + 2) *
+ sizeof(*token->mechTypes));
+ asn1_read_OID(asn1, token->mechTypes + i);
+ }
+ token->mechTypes[i] = NULL;
+
+ asn1_end_tag(asn1);
+ asn1_end_tag(asn1);
+ break;
+ /* Read reqFlags */
+ case ASN1_CONTEXT(1):
+ asn1_start_tag(asn1, ASN1_CONTEXT(1));
+ asn1_read_Integer(asn1, &token->reqFlags);
+ token->reqFlags |= SPNEGO_REQ_FLAG;
+ asn1_end_tag(asn1);
+ break;
+ /* Read mechToken */
+ case ASN1_CONTEXT(2):
+ asn1_start_tag(asn1, ASN1_CONTEXT(2));
+ asn1_read_OctetString(asn1, &token->mechToken);
+ asn1_end_tag(asn1);
+ break;
+ /* Read mecListMIC */
+ case ASN1_CONTEXT(3):
+ asn1_start_tag(asn1, ASN1_CONTEXT(3));
+ if (asn1->data[asn1->ofs] == ASN1_OCTET_STRING) {
+ asn1_read_OctetString(asn1,
+ &token->mechListMIC);
+ } else {
+ /* RFC 2478 says we have an Octet String here,
+ but W2k sends something different... */
+ char *mechListMIC;
+ asn1_push_tag(asn1, ASN1_SEQUENCE(0));
+ asn1_push_tag(asn1, ASN1_CONTEXT(0));
+ asn1_read_GeneralString(asn1, &mechListMIC);
+ asn1_pop_tag(asn1);
+ asn1_pop_tag(asn1);
+
+ token->mechListMIC =
+ data_blob(mechListMIC, strlen(mechListMIC));
+ SAFE_FREE(mechListMIC);
+ }
+ asn1_end_tag(asn1);
+ break;
+ default:
+ asn1->has_error = True;
+ break;
+ }
+ }
+
+ asn1_end_tag(asn1);
+ asn1_end_tag(asn1);
+
+ return !asn1->has_error;
+}
+
+static BOOL write_negTokenInit(ASN1_DATA *asn1, negTokenInit_t *token)
+{
+ asn1_push_tag(asn1, ASN1_CONTEXT(0));
+ asn1_push_tag(asn1, ASN1_SEQUENCE(0));
+
+ /* Write mechTypes */
+ if (token->mechTypes && *token->mechTypes) {
+ int i;
+
+ asn1_push_tag(asn1, ASN1_CONTEXT(0));
+ asn1_push_tag(asn1, ASN1_SEQUENCE(0));
+ for (i = 0; token->mechTypes[i]; i++) {
+ asn1_write_OID(asn1, token->mechTypes[i]);
+ }
+ asn1_pop_tag(asn1);
+ asn1_pop_tag(asn1);
+ }
+
+ /* write reqFlags */
+ if (token->reqFlags & SPNEGO_REQ_FLAG) {
+ int flags = token->reqFlags & ~SPNEGO_REQ_FLAG;
+
+ asn1_push_tag(asn1, ASN1_CONTEXT(1));
+ asn1_write_Integer(asn1, flags);
+ asn1_pop_tag(asn1);
+ }
+
+ /* write mechToken */
+ if (token->mechToken.data) {
+ asn1_push_tag(asn1, ASN1_CONTEXT(2));
+ asn1_write_OctetString(asn1, token->mechToken.data,
+ token->mechToken.length);
+ asn1_pop_tag(asn1);
+ }
+
+ /* write mechListMIC */
+ if (token->mechListMIC.data) {
+ asn1_push_tag(asn1, ASN1_CONTEXT(3));
+#if 0
+ /* This is what RFC 2478 says ... */
+ asn1_write_OctetString(asn1, token->mechListMIC.data,
+ token->mechListMIC.length);
+#else
+ /* ... but unfortunately this is what Windows
+ sends/expects */
+ asn1_push_tag(asn1, ASN1_SEQUENCE(0));
+ asn1_push_tag(asn1, ASN1_CONTEXT(0));
+ asn1_push_tag(asn1, ASN1_GENERAL_STRING);
+ asn1_write(asn1, token->mechListMIC.data,
+ token->mechListMIC.length);
+ asn1_pop_tag(asn1);
+ asn1_pop_tag(asn1);
+ asn1_pop_tag(asn1);
+#endif
+ asn1_pop_tag(asn1);
+ }
+
+ asn1_pop_tag(asn1);
+ asn1_pop_tag(asn1);
+
+ return !asn1->has_error;
+}
+
+static BOOL read_negTokenTarg(ASN1_DATA *asn1, negTokenTarg_t *token)
+{
+ ZERO_STRUCTP(token);
+
+ asn1_start_tag(asn1, ASN1_CONTEXT(1));
+ asn1_start_tag(asn1, ASN1_SEQUENCE(0));
+
+ while (!asn1->has_error && 0 < asn1_tag_remaining(asn1)) {
+ switch (asn1->data[asn1->ofs]) {
+ case ASN1_CONTEXT(0):
+ asn1_start_tag(asn1, ASN1_CONTEXT(0));
+ asn1_start_tag(asn1, ASN1_ENUMERATED);
+ asn1_read_uint8(asn1, &token->negResult);
+ asn1_end_tag(asn1);
+ asn1_end_tag(asn1);
+ break;
+ case ASN1_CONTEXT(1):
+ asn1_start_tag(asn1, ASN1_CONTEXT(1));
+ asn1_read_OID(asn1, &token->supportedMech);
+ asn1_end_tag(asn1);
+ break;
+ case ASN1_CONTEXT(2):
+ asn1_start_tag(asn1, ASN1_CONTEXT(2));
+ asn1_read_OctetString(asn1, &token->responseToken);
+ asn1_end_tag(asn1);
+ break;
+ case ASN1_CONTEXT(3):
+ asn1_start_tag(asn1, ASN1_CONTEXT(3));
+ asn1_read_OctetString(asn1, &token->mechListMIC);
+ asn1_end_tag(asn1);
+ break;
+ default:
+ asn1->has_error = True;
+ break;
+ }
+ }
+
+ asn1_end_tag(asn1);
+ asn1_end_tag(asn1);
+
+ return !asn1->has_error;
+}
+
+static BOOL write_negTokenTarg(ASN1_DATA *asn1, negTokenTarg_t *token)
+{
+ asn1_push_tag(asn1, ASN1_CONTEXT(1));
+ asn1_push_tag(asn1, ASN1_SEQUENCE(0));
+
+ asn1_push_tag(asn1, ASN1_CONTEXT(0));
+ asn1_write_enumerated(asn1, token->negResult);
+ asn1_pop_tag(asn1);
+
+ if (token->supportedMech) {
+ asn1_push_tag(asn1, ASN1_CONTEXT(1));
+ asn1_write_OID(asn1, token->supportedMech);
+ asn1_pop_tag(asn1);
+ }
+
+ if (token->responseToken.data) {
+ asn1_push_tag(asn1, ASN1_CONTEXT(2));
+ asn1_write_OctetString(asn1, token->responseToken.data,
+ token->responseToken.length);
+ asn1_pop_tag(asn1);
+ }
+
+ if (token->mechListMIC.data) {
+ asn1_push_tag(asn1, ASN1_CONTEXT(3));
+ asn1_write_OctetString(asn1, token->mechListMIC.data,
+ token->mechListMIC.length);
+ asn1_pop_tag(asn1);
+ }
+
+ asn1_pop_tag(asn1);
+ asn1_pop_tag(asn1);
+
+ return !asn1->has_error;
+}
+
+ssize_t read_spnego_data(DATA_BLOB data, SPNEGO_DATA *token)
+{
+ ASN1_DATA asn1;
+ ssize_t ret = -1;
+
+ ZERO_STRUCTP(token);
+ ZERO_STRUCT(asn1);
+ asn1_load(&asn1, data);
+
+ switch (asn1.data[asn1.ofs]) {
+ case ASN1_APPLICATION(0):
+ asn1_start_tag(&asn1, ASN1_APPLICATION(0));
+ asn1_check_OID(&asn1, OID_SPNEGO);
+ if (read_negTokenInit(&asn1, &token->negTokenInit)) {
+ token->type = SPNEGO_NEG_TOKEN_INIT;
+ }
+ asn1_end_tag(&asn1);
+ break;
+ case ASN1_CONTEXT(1):
+ if (read_negTokenTarg(&asn1, &token->negTokenTarg)) {
+ token->type = SPNEGO_NEG_TOKEN_TARG;
+ }
+ break;
+ default:
+ break;
+ }
+
+ if (!asn1.has_error) ret = asn1.ofs;
+ asn1_free(&asn1);
+
+ return ret;
+}
+
+ssize_t write_spnego_data(DATA_BLOB *blob, SPNEGO_DATA *spnego)
+{
+ ASN1_DATA asn1;
+ ssize_t ret = -1;
+
+ ZERO_STRUCT(asn1);
+
+ switch (spnego->type) {
+ case SPNEGO_NEG_TOKEN_INIT:
+ asn1_push_tag(&asn1, ASN1_APPLICATION(0));
+ asn1_write_OID(&asn1, OID_SPNEGO);
+ write_negTokenInit(&asn1, &spnego->negTokenInit);
+ asn1_pop_tag(&asn1);
+ break;
+ case SPNEGO_NEG_TOKEN_TARG:
+ write_negTokenTarg(&asn1, &spnego->negTokenTarg);
+ break;
+ default:
+ asn1.has_error = True;
+ break;
+ }
+
+ if (!asn1.has_error) {
+ *blob = data_blob(asn1.data, asn1.length);
+ ret = asn1.ofs;
+ }
+ asn1_free(&asn1);
+
+ return ret;
+}
+
+BOOL free_spnego_data(SPNEGO_DATA *spnego)
+{
+ BOOL ret = True;
+
+ if (!spnego) goto out;
+
+ switch(spnego->type) {
+ case SPNEGO_NEG_TOKEN_INIT:
+ if (spnego->negTokenInit.mechTypes) {
+ int i;
+ for (i = 0; spnego->negTokenInit.mechTypes[i]; i++) {
+ free(spnego->negTokenInit.mechTypes[i]);
+ }
+ free(spnego->negTokenInit.mechTypes);
+ }
+ data_blob_free(&spnego->negTokenInit.mechToken);
+ data_blob_free(&spnego->negTokenInit.mechListMIC);
+ break;
+ case SPNEGO_NEG_TOKEN_TARG:
+ if (spnego->negTokenTarg.supportedMech) {
+ free(spnego->negTokenTarg.supportedMech);
+ }
+ data_blob_free(&spnego->negTokenTarg.responseToken);
+ data_blob_free(&spnego->negTokenTarg.mechListMIC);
+ break;
+ default:
+ ret = False;
+ break;
+ }
+ ZERO_STRUCTP(spnego);
+out:
+ return ret;
+}
+
generated by cgit (git 2.34.1) at 2024-11-29 15:44:56 +0000