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-rw-r--r--source3/libsmb/clispnego.c205
1 files changed, 205 insertions, 0 deletions
diff --git a/source3/libsmb/clispnego.c b/source3/libsmb/clispnego.c
new file mode 100644
index 0000000..1608f6a
--- /dev/null
+++ b/source3/libsmb/clispnego.c
@@ -0,0 +1,205 @@
+/*
+ Unix SMB/CIFS implementation.
+ simple kerberos5/SPNEGO routines
+ Copyright (C) Andrew Tridgell 2001
+ Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2002
+ Copyright (C) Luke Howard 2003
+ Copyright (C) Jeremy Allison 2010
+
+ 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 "smb_krb5.h"
+#include "../lib/util/asn1.h"
+
+/*
+ parse a negTokenInit packet giving a GUID, a list of supported
+ OIDs (the mechanisms) and a principal name string
+*/
+bool spnego_parse_negTokenInit(TALLOC_CTX *ctx,
+ DATA_BLOB blob,
+ char *OIDs[ASN1_MAX_OIDS],
+ char **principal,
+ DATA_BLOB *secblob)
+{
+ int i;
+ bool ret = false;
+ ASN1_DATA *data;
+
+ for (i = 0; i < ASN1_MAX_OIDS; i++) {
+ OIDs[i] = NULL;
+ }
+
+ if (principal) {
+ *principal = NULL;
+ }
+ if (secblob) {
+ *secblob = data_blob_null;
+ }
+
+ data = asn1_init(talloc_tos(), ASN1_MAX_TREE_DEPTH);
+ if (data == NULL) {
+ return false;
+ }
+
+ if (!asn1_load(data, blob)) goto err;
+
+ if (!asn1_start_tag(data,ASN1_APPLICATION(0))) goto err;
+
+ if (!asn1_check_OID(data,OID_SPNEGO)) goto err;
+
+ /* negTokenInit [0] NegTokenInit */
+ if (!asn1_start_tag(data,ASN1_CONTEXT(0))) goto err;
+ if (!asn1_start_tag(data,ASN1_SEQUENCE(0))) goto err;
+
+ /* mechTypes [0] MechTypeList OPTIONAL */
+
+ /* Not really optional, we depend on this to decide
+ * what mechanisms we have to work with. */
+
+ if (!asn1_start_tag(data,ASN1_CONTEXT(0))) goto err;
+ if (!asn1_start_tag(data,ASN1_SEQUENCE(0))) goto err;
+ for (i=0; asn1_tag_remaining(data) > 0 && i < ASN1_MAX_OIDS-1; i++) {
+ if (!asn1_read_OID(data,ctx, &OIDs[i])) {
+ goto err;
+ }
+ if (asn1_has_error(data)) {
+ goto err;
+ }
+ }
+ OIDs[i] = NULL;
+ if (!asn1_end_tag(data)) goto err;
+ if (!asn1_end_tag(data)) goto err;
+
+ /*
+ Win7 + Live Sign-in Assistant attaches a mechToken
+ ASN1_CONTEXT(2) to the negTokenInit packet
+ which breaks our negotiation if we just assume
+ the next tag is ASN1_CONTEXT(3).
+ */
+
+ if (asn1_peek_tag(data, ASN1_CONTEXT(1))) {
+ uint8_t flags;
+
+ /* reqFlags [1] ContextFlags OPTIONAL */
+ if (!asn1_start_tag(data, ASN1_CONTEXT(1))) goto err;
+ if (!asn1_start_tag(data, ASN1_BIT_STRING)) goto err;
+ while (asn1_tag_remaining(data) > 0) {
+ if (!asn1_read_uint8(data, &flags)) goto err;
+ }
+ if (!asn1_end_tag(data)) goto err;
+ if (!asn1_end_tag(data)) goto err;
+ }
+
+ if (asn1_peek_tag(data, ASN1_CONTEXT(2))) {
+ DATA_BLOB sblob = data_blob_null;
+ /* mechToken [2] OCTET STRING OPTIONAL */
+ if (!asn1_start_tag(data, ASN1_CONTEXT(2))) goto err;
+ if (!asn1_read_OctetString(data, ctx, &sblob)) goto err;
+ if (!asn1_end_tag(data)) {
+ data_blob_free(&sblob);
+ goto err;
+ }
+ if (secblob) {
+ *secblob = sblob;
+ } else {
+ data_blob_free(&sblob);
+ }
+ }
+
+ if (asn1_peek_tag(data, ASN1_CONTEXT(3))) {
+ char *princ = NULL;
+ /* mechListMIC [3] OCTET STRING OPTIONAL */
+ if (!asn1_start_tag(data, ASN1_CONTEXT(3))) goto err;
+ if (!asn1_start_tag(data, ASN1_SEQUENCE(0))) goto err;
+ if (!asn1_start_tag(data, ASN1_CONTEXT(0))) goto err;
+ if (!asn1_read_GeneralString(data, ctx, &princ)) goto err;
+ if (!asn1_end_tag(data)) goto err;
+ if (!asn1_end_tag(data)) goto err;
+ if (!asn1_end_tag(data)) goto err;
+ if (principal) {
+ *principal = princ;
+ } else {
+ TALLOC_FREE(princ);
+ }
+ }
+
+ if (!asn1_end_tag(data)) goto err;
+ if (!asn1_end_tag(data)) goto err;
+
+ if (!asn1_end_tag(data)) goto err;
+
+ ret = !asn1_has_error(data);
+
+ err:
+
+ if (asn1_has_error(data)) {
+ int j;
+ if (principal) {
+ TALLOC_FREE(*principal);
+ }
+ if (secblob) {
+ data_blob_free(secblob);
+ }
+ for(j = 0; j < i && j < ASN1_MAX_OIDS-1; j++) {
+ TALLOC_FREE(OIDs[j]);
+ }
+ }
+
+ asn1_free(data);
+ return ret;
+}
+
+/*
+ generate a krb5 GSS-API wrapper packet given a ticket
+*/
+DATA_BLOB spnego_gen_krb5_wrap(TALLOC_CTX *ctx, const DATA_BLOB ticket, const uint8_t tok_id[2])
+{
+ ASN1_DATA *data;
+ DATA_BLOB ret = data_blob_null;
+
+ data = asn1_init(talloc_tos(), ASN1_MAX_TREE_DEPTH);
+ if (data == NULL) {
+ return data_blob_null;
+ }
+
+ if (!asn1_push_tag(data, ASN1_APPLICATION(0))) goto err;
+ if (!asn1_write_OID(data, OID_KERBEROS5)) goto err;
+
+ if (!asn1_write(data, tok_id, 2)) goto err;
+ if (!asn1_write(data, ticket.data, ticket.length)) goto err;
+ if (!asn1_pop_tag(data)) goto err;
+
+ if (!asn1_extract_blob(data, ctx, &ret)) {
+ goto err;
+ }
+
+ asn1_free(data);
+ data = NULL;
+
+ err:
+
+ if (data != NULL) {
+ if (asn1_has_error(data)) {
+ DEBUG(1, ("Failed to build krb5 wrapper at offset %d\n",
+ (int)asn1_current_ofs(data)));
+ }
+
+ asn1_free(data);
+ }
+
+ return ret;
+}