1 files changed, 127 insertions, 0 deletions
diff --git a/auth/gensec/external.c b/auth/gensec/external.c
new file mode 100644
index 0000000..300ce6b
--- /dev/null
+++ b/auth/gensec/external.c
@@ -0,0 +1,127 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   SASL/EXTERNAL authentication.
+
+   Copyright (C) Howard Chu <hyc@symas.com> 2013
+
+   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 <tevent.h>
+#include "lib/util/tevent_ntstatus.h"
+#include "auth/credentials/credentials.h"
+#include "auth/gensec/gensec.h"
+#include "auth/gensec/gensec_internal.h"
+#include "auth/gensec/gensec_proto.h"
+#include "auth/gensec/gensec_toplevel_proto.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_AUTH
+
+/* SASL/EXTERNAL is essentially a no-op; it is only usable when the transport
+ * layer is already mutually authenticated.
+ */
+
+NTSTATUS gensec_external_init(TALLOC_CTX *ctx);
+
+static NTSTATUS gensec_external_start(struct gensec_security *gensec_security)
+{
+	if (gensec_security->want_features & GENSEC_FEATURE_SIGN)
+		return NT_STATUS_INVALID_PARAMETER;
+	if (gensec_security->want_features & GENSEC_FEATURE_SEAL)
+		return NT_STATUS_INVALID_PARAMETER;
+
+	return NT_STATUS_OK;
+}
+
+struct gensec_external_update_state {
+	DATA_BLOB out;
+};
+
+static struct tevent_req *gensec_external_update_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct gensec_security *gensec_security,
+					const DATA_BLOB in)
+{
+	struct tevent_req *req;
+	struct gensec_external_update_state *state = NULL;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct gensec_external_update_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->out = data_blob_talloc(state, "", 0);
+	if (tevent_req_nomem(state->out.data, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	tevent_req_done(req);
+	return tevent_req_post(req, ev);
+}
+
+static NTSTATUS gensec_external_update_recv(struct tevent_req *req,
+					    TALLOC_CTX *out_mem_ctx,
+					    DATA_BLOB *out)
+{
+	struct gensec_external_update_state *state =
+		tevent_req_data(req,
+		struct gensec_external_update_state);
+	NTSTATUS status;
+
+	*out = data_blob_null;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		tevent_req_received(req);
+		return status;
+	}
+
+	*out = state->out;
+	tevent_req_received(req);
+	return NT_STATUS_OK;
+}
+
+/* We have no features */
+static bool gensec_external_have_feature(struct gensec_security *gensec_security,
+				     uint32_t feature)
+{
+	return false;
+}
+
+static const struct gensec_security_ops gensec_external_ops = {
+	.name             = "sasl-EXTERNAL",
+	.sasl_name        = "EXTERNAL",
+	.client_start     = gensec_external_start,
+	.update_send      = gensec_external_update_send,
+	.update_recv      = gensec_external_update_recv,
+	.have_feature     = gensec_external_have_feature,
+	.enabled          = true,
+	.priority         = GENSEC_EXTERNAL
+};
+
+
+NTSTATUS gensec_external_init(TALLOC_CTX *ctx)
+{
+	NTSTATUS ret;
+
+	ret = gensec_register(ctx, &gensec_external_ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' gensec backend!\n",
+			 gensec_external_ops.name));
+	}
+	return ret;
+}