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-rw-r--r--libcli/auth/spnego_parse.c446
1 files changed, 446 insertions, 0 deletions
diff --git a/libcli/auth/spnego_parse.c b/libcli/auth/spnego_parse.c
new file mode 100644
index 0000000..f7f19b1
--- /dev/null
+++ b/libcli/auth/spnego_parse.c
@@ -0,0 +1,446 @@
+/*
+ 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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "../libcli/auth/spnego.h"
+#include "../lib/util/asn1.h"
+
+static bool read_negTokenInit(struct asn1_data *asn1, TALLOC_CTX *mem_ctx,
+ struct spnego_negTokenInit *token)
+{
+ ZERO_STRUCTP(token);
+
+ if (!asn1_start_tag(asn1, ASN1_CONTEXT(0))) return false;
+ if (!asn1_start_tag(asn1, ASN1_SEQUENCE(0))) return false;
+
+ while (asn1_tag_remaining(asn1) > 0) {
+ int i;
+ uint8_t context;
+
+ if (!asn1_peek_uint8(asn1, &context)) {
+ asn1_set_error(asn1);
+ break;
+ }
+
+ switch (context) {
+ /* Read mechTypes */
+ case ASN1_CONTEXT(0): {
+ const char **mechTypes;
+
+ if (!asn1_start_tag(asn1, ASN1_CONTEXT(0))) return false;
+ if (!asn1_start_tag(asn1, ASN1_SEQUENCE(0))) return false;
+
+ mechTypes = talloc(mem_ctx, const char *);
+ if (mechTypes == NULL) {
+ asn1_set_error(asn1);
+ return false;
+ }
+ for (i = 0; asn1_tag_remaining(asn1) > 0; i++) {
+ char *oid;
+ const char **p;
+ p = talloc_realloc(mem_ctx,
+ mechTypes,
+ const char *, i+2);
+ if (p == NULL) {
+ talloc_free(mechTypes);
+ asn1_set_error(asn1);
+ return false;
+ }
+ mechTypes = p;
+
+ if (!asn1_read_OID(asn1, mechTypes, &oid)) return false;
+ mechTypes[i] = oid;
+ }
+ mechTypes[i] = NULL;
+ token->mechTypes = mechTypes;
+
+ asn1_end_tag(asn1);
+ asn1_end_tag(asn1);
+ break;
+ }
+ /* Read reqFlags */
+ case ASN1_CONTEXT(1):
+ if (!asn1_start_tag(asn1, ASN1_CONTEXT(1))) return false;
+ if (!asn1_read_BitString(asn1, mem_ctx, &token->reqFlags,
+ &token->reqFlagsPadding)) return false;
+ if (!asn1_end_tag(asn1)) return false;
+ break;
+ /* Read mechToken */
+ case ASN1_CONTEXT(2):
+ if (!asn1_start_tag(asn1, ASN1_CONTEXT(2))) return false;
+ if (!asn1_read_OctetString(asn1, mem_ctx, &token->mechToken)) return false;
+ if (!asn1_end_tag(asn1)) return false;
+ break;
+ /* Read mecListMIC */
+ case ASN1_CONTEXT(3):
+ {
+ uint8_t type_peek;
+ if (!asn1_start_tag(asn1, ASN1_CONTEXT(3))) return false;
+ if (!asn1_peek_uint8(asn1, &type_peek)) {
+ asn1_set_error(asn1);
+ break;
+ }
+ if (type_peek == ASN1_OCTET_STRING) {
+ if (!asn1_read_OctetString(asn1, mem_ctx,
+ &token->mechListMIC)) return false;
+ } else {
+ /* RFC 2478 says we have an Octet String here,
+ but W2k sends something different... */
+ char *mechListMIC;
+ if (!asn1_start_tag(asn1, ASN1_SEQUENCE(0))) return false;
+ if (!asn1_start_tag(asn1, ASN1_CONTEXT(0))) return false;
+ if (!asn1_read_GeneralString(asn1, mem_ctx, &mechListMIC)) return false;
+ if (!asn1_end_tag(asn1)) return false;
+ if (!asn1_end_tag(asn1)) return false;
+
+ token->targetPrincipal = mechListMIC;
+ }
+ if (!asn1_end_tag(asn1)) return false;
+ break;
+ }
+ default:
+ asn1_set_error(asn1);
+ break;
+ }
+ }
+
+ if (!asn1_end_tag(asn1)) return false;
+ if (!asn1_end_tag(asn1)) return false;
+
+ return !asn1_has_error(asn1);
+}
+
+static bool write_negTokenInit(struct asn1_data *asn1, struct spnego_negTokenInit *token)
+{
+ if (!asn1_push_tag(asn1, ASN1_CONTEXT(0))) return false;
+ if (!asn1_push_tag(asn1, ASN1_SEQUENCE(0))) return false;
+
+ /* Write mechTypes */
+ if (token->mechTypes && *token->mechTypes) {
+ int i;
+
+ if (!asn1_push_tag(asn1, ASN1_CONTEXT(0))) return false;
+ if (!asn1_push_tag(asn1, ASN1_SEQUENCE(0))) return false;
+ for (i = 0; token->mechTypes[i]; i++) {
+ if (!asn1_write_OID(asn1, token->mechTypes[i])) return false;
+ }
+ if (!asn1_pop_tag(asn1)) return false;
+ if (!asn1_pop_tag(asn1)) return false;
+ }
+
+ /* write reqFlags */
+ if (token->reqFlags.length > 0) {
+ if (!asn1_push_tag(asn1, ASN1_CONTEXT(1))) return false;
+ if (!asn1_write_BitString(asn1, token->reqFlags.data,
+ token->reqFlags.length,
+ token->reqFlagsPadding)) return false;
+ if (!asn1_pop_tag(asn1)) return false;
+ }
+
+ /* write mechToken */
+ if (token->mechToken.data) {
+ if (!asn1_push_tag(asn1, ASN1_CONTEXT(2))) return false;
+ if (!asn1_write_OctetString(asn1, token->mechToken.data,
+ token->mechToken.length)) return false;
+ if (!asn1_pop_tag(asn1)) return false;
+ }
+
+ /* write mechListMIC */
+ if (token->mechListMIC.data) {
+ if (!asn1_push_tag(asn1, ASN1_CONTEXT(3))) return false;
+#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 */
+ if (!asn1_push_tag(asn1, ASN1_SEQUENCE(0))) return false;
+ if (!asn1_push_tag(asn1, ASN1_CONTEXT(0))) return false;
+ if (!asn1_push_tag(asn1, ASN1_GENERAL_STRING)) return false;
+ if (!asn1_write(asn1, token->mechListMIC.data,
+ token->mechListMIC.length)) return false;
+ if (!asn1_pop_tag(asn1)) return false;
+ if (!asn1_pop_tag(asn1)) return false;
+ if (!asn1_pop_tag(asn1)) return false;
+#endif
+ if (!asn1_pop_tag(asn1)) return false;
+ }
+
+ if (!asn1_pop_tag(asn1)) return false;
+ if (!asn1_pop_tag(asn1)) return false;
+
+ return !asn1_has_error(asn1);
+}
+
+static bool read_negTokenTarg(struct asn1_data *asn1, TALLOC_CTX *mem_ctx,
+ struct spnego_negTokenTarg *token)
+{
+ ZERO_STRUCTP(token);
+
+ if (!asn1_start_tag(asn1, ASN1_CONTEXT(1))) return false;
+ if (!asn1_start_tag(asn1, ASN1_SEQUENCE(0))) return false;
+
+ while (asn1_tag_remaining(asn1) > 0) {
+ uint8_t context;
+ uint8_t neg_result;
+ char *oid;
+
+ if (!asn1_peek_uint8(asn1, &context)) {
+ asn1_set_error(asn1);
+ break;
+ }
+
+ switch (context) {
+ case ASN1_CONTEXT(0):
+ if (!asn1_start_tag(asn1, ASN1_CONTEXT(0))) return false;
+ if (!asn1_start_tag(asn1, ASN1_ENUMERATED)) return false;
+ if (!asn1_read_uint8(asn1, &neg_result)) return false;
+ token->negResult = neg_result;
+ if (!asn1_end_tag(asn1)) return false;
+ if (!asn1_end_tag(asn1)) return false;
+ break;
+ case ASN1_CONTEXT(1):
+ if (!asn1_start_tag(asn1, ASN1_CONTEXT(1))) return false;
+ if (!asn1_read_OID(asn1, mem_ctx, &oid)) return false;
+ token->supportedMech = oid;
+ if (!asn1_end_tag(asn1)) return false;
+ break;
+ case ASN1_CONTEXT(2):
+ if (!asn1_start_tag(asn1, ASN1_CONTEXT(2))) return false;
+ if (!asn1_read_OctetString(asn1, mem_ctx, &token->responseToken)) return false;
+ if (!asn1_end_tag(asn1)) return false;
+ break;
+ case ASN1_CONTEXT(3):
+ if (!asn1_start_tag(asn1, ASN1_CONTEXT(3))) return false;
+ if (!asn1_read_OctetString(asn1, mem_ctx, &token->mechListMIC)) return false;
+ if (!asn1_end_tag(asn1)) return false;
+ break;
+ default:
+ asn1_set_error(asn1);
+ break;
+ }
+ }
+
+ if (!asn1_end_tag(asn1)) return false;
+ if (!asn1_end_tag(asn1)) return false;
+
+ return !asn1_has_error(asn1);
+}
+
+static bool write_negTokenTarg(struct asn1_data *asn1, struct spnego_negTokenTarg *token)
+{
+ if (!asn1_push_tag(asn1, ASN1_CONTEXT(1))) return false;
+ if (!asn1_push_tag(asn1, ASN1_SEQUENCE(0))) return false;
+
+ if (token->negResult != SPNEGO_NONE_RESULT) {
+ if (!asn1_push_tag(asn1, ASN1_CONTEXT(0))) return false;
+ if (!asn1_write_enumerated(asn1, token->negResult)) return false;
+ if (!asn1_pop_tag(asn1)) return false;
+ }
+
+ if (token->supportedMech) {
+ if (!asn1_push_tag(asn1, ASN1_CONTEXT(1))) return false;
+ if (!asn1_write_OID(asn1, token->supportedMech)) return false;
+ if (!asn1_pop_tag(asn1)) return false;
+ }
+
+ if (token->responseToken.data) {
+ if (!asn1_push_tag(asn1, ASN1_CONTEXT(2))) return false;
+ if (!asn1_write_OctetString(asn1, token->responseToken.data,
+ token->responseToken.length)) return false;
+ if (!asn1_pop_tag(asn1)) return false;
+ }
+
+ if (token->mechListMIC.data) {
+ if (!asn1_push_tag(asn1, ASN1_CONTEXT(3))) return false;
+ if (!asn1_write_OctetString(asn1, token->mechListMIC.data,
+ token->mechListMIC.length)) return false;
+ if (!asn1_pop_tag(asn1)) return false;
+ }
+
+ if (!asn1_pop_tag(asn1)) return false;
+ if (!asn1_pop_tag(asn1)) return false;
+
+ return !asn1_has_error(asn1);
+}
+
+ssize_t spnego_read_data(TALLOC_CTX *mem_ctx, DATA_BLOB data, struct spnego_data *token)
+{
+ struct asn1_data *asn1;
+ ssize_t ret = -1;
+ uint8_t context;
+
+ ZERO_STRUCTP(token);
+
+ if (data.length == 0) {
+ return ret;
+ }
+
+ asn1 = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
+ if (asn1 == NULL) {
+ return -1;
+ }
+
+ if (!asn1_load(asn1, data)) goto err;
+
+ if (!asn1_peek_uint8(asn1, &context)) {
+ asn1_set_error(asn1);
+ } else {
+ switch (context) {
+ case ASN1_APPLICATION(0):
+ if (!asn1_start_tag(asn1, ASN1_APPLICATION(0))) goto err;
+ if (!asn1_check_OID(asn1, OID_SPNEGO)) goto err;
+ if (read_negTokenInit(asn1, mem_ctx, &token->negTokenInit)) {
+ token->type = SPNEGO_NEG_TOKEN_INIT;
+ }
+ if (!asn1_end_tag(asn1)) goto err;
+ break;
+ case ASN1_CONTEXT(1):
+ if (read_negTokenTarg(asn1, mem_ctx, &token->negTokenTarg)) {
+ token->type = SPNEGO_NEG_TOKEN_TARG;
+ }
+ break;
+ default:
+ asn1_set_error(asn1);
+ break;
+ }
+ }
+
+ if (!asn1_has_error(asn1)) {
+ ret = asn1_current_ofs(asn1);
+ }
+
+ err:
+
+ asn1_free(asn1);
+
+ return ret;
+}
+
+ssize_t spnego_write_data(TALLOC_CTX *mem_ctx, DATA_BLOB *blob, struct spnego_data *spnego)
+{
+ struct asn1_data *asn1 = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
+ ssize_t ret = -1;
+
+ if (asn1 == NULL) {
+ return -1;
+ }
+
+ switch (spnego->type) {
+ case SPNEGO_NEG_TOKEN_INIT:
+ if (!asn1_push_tag(asn1, ASN1_APPLICATION(0))) goto err;
+ if (!asn1_write_OID(asn1, OID_SPNEGO)) goto err;
+ if (!write_negTokenInit(asn1, &spnego->negTokenInit)) goto err;
+ if (!asn1_pop_tag(asn1)) goto err;
+ break;
+ case SPNEGO_NEG_TOKEN_TARG:
+ write_negTokenTarg(asn1, &spnego->negTokenTarg);
+ break;
+ default:
+ asn1_set_error(asn1);
+ break;
+ }
+
+ if (!asn1_extract_blob(asn1, mem_ctx, blob)) {
+ goto err;
+ }
+
+ ret = asn1_current_ofs(asn1);
+
+ err:
+
+ asn1_free(asn1);
+
+ return ret;
+}
+
+bool spnego_free_data(struct spnego_data *spnego)
+{
+ bool ret = true;
+
+ if (!spnego) goto out;
+
+ switch(spnego->type) {
+ case SPNEGO_NEG_TOKEN_INIT:
+ if (spnego->negTokenInit.mechTypes) {
+ talloc_free(discard_const(spnego->negTokenInit.mechTypes));
+ }
+ data_blob_free(&spnego->negTokenInit.reqFlags);
+ data_blob_free(&spnego->negTokenInit.mechToken);
+ data_blob_free(&spnego->negTokenInit.mechListMIC);
+ talloc_free(spnego->negTokenInit.targetPrincipal);
+ break;
+ case SPNEGO_NEG_TOKEN_TARG:
+ if (spnego->negTokenTarg.supportedMech) {
+ talloc_free(discard_const(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;
+}
+
+bool spnego_write_mech_types(TALLOC_CTX *mem_ctx,
+ const char * const *mech_types,
+ DATA_BLOB *blob)
+{
+ bool ret = false;
+ struct asn1_data *asn1 = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
+
+ if (asn1 == NULL) {
+ return false;
+ }
+
+ /* Write mechTypes */
+ if (mech_types && *mech_types) {
+ int i;
+
+ if (!asn1_push_tag(asn1, ASN1_SEQUENCE(0))) goto err;
+ for (i = 0; mech_types[i]; i++) {
+ if (!asn1_write_OID(asn1, mech_types[i])) goto err;
+ }
+ if (!asn1_pop_tag(asn1)) goto err;
+ }
+
+ if (asn1_has_error(asn1)) {
+ goto err;
+ }
+
+ if (!asn1_extract_blob(asn1, mem_ctx, blob)) {
+ goto err;
+ }
+
+ ret = true;
+
+ err:
+
+ asn1_free(asn1);
+
+ return ret;
+}
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