s3:smbd: add support for SMB2 Notify

metze

1 files changed, 375 insertions, 0 deletions

diff --git a/source3/smbd/smb2_notify.c b/source3/smbd/smb2_notify.c
new file mode 100644
index 0000000000..7ab93ce574
--- /dev/null
+++ b/source3/smbd/smb2_notify.c
@@ -0,0 +1,375 @@
+/*
+   Unix SMB/CIFS implementation.
+   Core SMB2 server
+
+   Copyright (C) Stefan Metzmacher 2009
+
+   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 "smbd/globals.h"
+#include "../source4/libcli/smb2/smb2_constants.h"
+
+static struct tevent_req *smbd_smb2_notify_send(TALLOC_CTX *mem_ctx,
+						struct tevent_context *ev,
+						struct smbd_smb2_request *smb2req,
+						uint16_t in_flags,
+						uint32_t in_output_buffer_length,
+						uint64_t in_file_id_volatile,
+						uint64_t in_completion_filter);
+static NTSTATUS smbd_smb2_notify_recv(struct tevent_req *req,
+				      TALLOC_CTX *mem_ctx,
+				      DATA_BLOB *out_output_buffer);
+
+static void smbd_smb2_request_notify_done(struct tevent_req *subreq);
+NTSTATUS smbd_smb2_request_process_notify(struct smbd_smb2_request *req)
+{
+	const uint8_t *inhdr;
+	const uint8_t *inbody;
+	int i = req->current_idx;
+	size_t expected_body_size = 0x20;
+	size_t body_size;
+	uint16_t in_flags;
+	uint32_t in_output_buffer_length;
+	uint64_t in_file_id_persistent;
+	uint64_t in_file_id_volatile;
+	uint64_t in_completion_filter;
+	struct tevent_req *subreq;
+
+	inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
+	if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
+		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
+	}
+
+	inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
+
+	body_size = SVAL(inbody, 0x00);
+	if (body_size != expected_body_size) {
+		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
+	}
+
+	in_flags		= SVAL(inbody, 0x02);
+	in_output_buffer_length	= IVAL(inbody, 0x04);
+	in_file_id_persistent	= BVAL(inbody, 0x08);
+	in_file_id_volatile	= BVAL(inbody, 0x10);
+	in_completion_filter	= IVAL(inbody, 0x18);
+
+	/*
+	 * 0x00010000 is what Windows 7 uses,
+	 * Windows 2008 uses 0x00080000
+	 */
+	if (in_output_buffer_length > 0x00010000) {
+		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
+	}
+
+	if (req->compat_chain_fsp) {
+		/* skip check */
+	} else if (in_file_id_persistent != 0) {
+		return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
+	}
+
+	subreq = smbd_smb2_notify_send(req,
+				       req->conn->smb2.event_ctx,
+				       req,
+				       in_flags,
+				       in_output_buffer_length,
+				       in_file_id_volatile,
+				       in_completion_filter);
+	if (subreq == NULL) {
+		return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
+	}
+	tevent_req_set_callback(subreq, smbd_smb2_request_notify_done, req);
+
+	if (tevent_req_is_in_progress(subreq)) {
+		return smbd_smb2_request_pending_queue(req);
+	}
+
+	return NT_STATUS_OK;
+}
+
+static void smbd_smb2_request_notify_done(struct tevent_req *subreq)
+{
+	struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
+					struct smbd_smb2_request);
+	int i = req->current_idx;
+	uint8_t *outhdr;
+	DATA_BLOB outbody;
+	DATA_BLOB outdyn;
+	uint16_t out_output_buffer_offset;
+	DATA_BLOB out_output_buffer;
+	NTSTATUS status;
+	NTSTATUS error; /* transport error */
+
+	status = smbd_smb2_notify_recv(subreq,
+				       req,
+				       &out_output_buffer);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		error = smbd_smb2_request_error(req, status);
+		if (!NT_STATUS_IS_OK(error)) {
+			smbd_server_connection_terminate(req->conn,
+							 nt_errstr(error));
+			return;
+		}
+		return;
+	}
+
+	out_output_buffer_offset = SMB2_HDR_BODY + 0x08;
+
+	outhdr = (uint8_t *)req->out.vector[i].iov_base;
+
+	outbody = data_blob_talloc(req->out.vector, NULL, 0x08);
+	if (outbody.data == NULL) {
+		error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
+		if (!NT_STATUS_IS_OK(error)) {
+			smbd_server_connection_terminate(req->conn,
+							 nt_errstr(error));
+			return;
+		}
+		return;
+	}
+
+	SSVAL(outbody.data, 0x00, 0x08 + 1);	/* struct size */
+	SSVAL(outbody.data, 0x02,
+	      out_output_buffer_offset);	/* output buffer offset */
+	SIVAL(outbody.data, 0x04,
+	      out_output_buffer.length);	/* output buffer length */
+
+	outdyn = out_output_buffer;
+
+	error = smbd_smb2_request_done(req, outbody, &outdyn);
+	if (!NT_STATUS_IS_OK(error)) {
+		smbd_server_connection_terminate(req->conn,
+						 nt_errstr(error));
+		return;
+	}
+}
+
+struct smbd_smb2_notify_state {
+	struct smbd_smb2_request *smb2req;
+	struct tevent_immediate *im;
+	NTSTATUS status;
+	DATA_BLOB out_output_buffer;
+};
+
+static void smbd_smb2_notify_reply(struct smb_request *smbreq,
+				   NTSTATUS error_code,
+				   uint8_t *buf, size_t len);
+static void smbd_smb2_notify_reply_trigger(struct tevent_context *ctx,
+					   struct tevent_immediate *im,
+					   void *private_data);
+
+static struct tevent_req *smbd_smb2_notify_send(TALLOC_CTX *mem_ctx,
+						struct tevent_context *ev,
+						struct smbd_smb2_request *smb2req,
+						uint16_t in_flags,
+						uint32_t in_output_buffer_length,
+						uint64_t in_file_id_volatile,
+						uint64_t in_completion_filter)
+{
+	struct tevent_req *req;
+	struct smbd_smb2_notify_state *state;
+	struct smb_request *smbreq;
+	connection_struct *conn = smb2req->tcon->compat_conn;
+	files_struct *fsp;
+	bool recursive = (in_flags & 0x0001) ? true : false;
+	NTSTATUS status;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct smbd_smb2_notify_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->smb2req = smb2req;
+	state->status = NT_STATUS_INTERNAL_ERROR;
+	state->out_output_buffer = data_blob_null;
+	state->im = NULL;
+
+	DEBUG(10,("smbd_smb2_notify_send: file_id[0x%016llX]\n",
+		  (unsigned long long)in_file_id_volatile));
+
+	smbreq = smbd_smb2_fake_smb_request(smb2req);
+	if (tevent_req_nomem(smbreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	smbreq->async_priv = (void *)req;
+
+	fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
+	if (fsp == NULL) {
+		tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
+		return tevent_req_post(req, ev);
+	}
+	if (conn != fsp->conn) {
+		tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
+		return tevent_req_post(req, ev);
+	}
+	if (smb2req->session->vuid != fsp->vuid) {
+		tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
+		return tevent_req_post(req, ev);
+	}
+
+	{
+		char *filter_string;
+
+		filter_string = notify_filter_string(NULL, in_completion_filter);
+		if (tevent_req_nomem(filter_string, req)) {
+			return tevent_req_post(req, ev);
+		}
+
+		DEBUG(3,("smbd_smb2_notify_send: notify change "
+			 "called on %s, filter = %s, recursive = %d\n",
+			 fsp->fsp_name, filter_string, recursive));
+
+		TALLOC_FREE(filter_string);
+	}
+
+	if ((!fsp->is_directory) || (conn != fsp->conn)) {
+		tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
+		return tevent_req_post(req, ev);
+	}
+
+	if (fsp->notify == NULL) {
+
+		status = change_notify_create(fsp,
+					      in_completion_filter,
+					      recursive);
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(10, ("change_notify_create returned %s\n",
+				   nt_errstr(status)));
+			tevent_req_nterror(req, status);
+			return tevent_req_post(req, ev);
+		}
+	}
+
+	if (fsp->notify->num_changes != 0) {
+
+		/*
+		 * We've got changes pending, respond immediately
+		 */
+
+		/*
+		 * TODO: write a torture test to check the filtering behaviour
+		 * here.
+		 */
+
+		change_notify_reply(fsp->conn, smbreq,
+				    NT_STATUS_OK,
+				    in_output_buffer_length,
+				    fsp->notify,
+				    smbd_smb2_notify_reply);
+
+		/*
+		 * change_notify_reply() above has independently
+		 * called tevent_req_done().
+		 */
+		return tevent_req_post(req, ev);
+	}
+
+	state->im = tevent_create_immediate(state);
+	if (tevent_req_nomem(state->im, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	/*
+	 * No changes pending, queue the request
+	 */
+
+	status = change_notify_add_request(smbreq,
+			in_output_buffer_length,
+			in_completion_filter,
+			recursive, fsp,
+			smbd_smb2_notify_reply);
+	if (!NT_STATUS_IS_OK(status)) {
+		tevent_req_nterror(req, status);
+		return tevent_req_post(req, ev);
+	}
+
+	return req;
+}
+
+static void smbd_smb2_notify_reply(struct smb_request *smbreq,
+				   NTSTATUS error_code,
+				   uint8_t *buf, size_t len)
+{
+	struct tevent_req *req = talloc_get_type_abort(smbreq->async_priv,
+						       struct tevent_req);
+	struct smbd_smb2_notify_state *state = tevent_req_data(req,
+					       struct smbd_smb2_notify_state);
+
+	state->status = error_code;
+	if (!NT_STATUS_IS_OK(error_code)) {
+		/* nothing */
+	} else if (len == 0) {
+		state->status = STATUS_NOTIFY_ENUM_DIR;
+	} else {
+		state->out_output_buffer = data_blob_talloc(state, buf, len);
+		if (state->out_output_buffer.data == NULL) {
+			state->status = NT_STATUS_NO_MEMORY;
+		}
+	}
+
+	if (state->im == NULL) {
+		smbd_smb2_notify_reply_trigger(NULL, NULL, req);
+		return;
+	}
+
+	/*
+	 * if this is called async, we need to go via an immediate event
+	 * because the caller replies on the smb_request (a child of req
+	 * being arround after calling this function
+	 */
+	tevent_schedule_immediate(state->im,
+				  state->smb2req->conn->smb2.event_ctx,
+				  smbd_smb2_notify_reply_trigger,
+				  req);
+}
+
+static void smbd_smb2_notify_reply_trigger(struct tevent_context *ctx,
+					   struct tevent_immediate *im,
+					   void *private_data)
+{
+	struct tevent_req *req = talloc_get_type_abort(private_data,
+						       struct tevent_req);
+	struct smbd_smb2_notify_state *state = tevent_req_data(req,
+					       struct smbd_smb2_notify_state);
+
+	if (!NT_STATUS_IS_OK(state->status)) {
+		tevent_req_nterror(req, state->status);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+static NTSTATUS smbd_smb2_notify_recv(struct tevent_req *req,
+				      TALLOC_CTX *mem_ctx,
+				      DATA_BLOB *out_output_buffer)
+{
+	NTSTATUS status;
+	struct smbd_smb2_notify_state *state = tevent_req_data(req,
+					       struct smbd_smb2_notify_state);
+
+	if (tevent_req_is_nterror(req, &status)) {
+		tevent_req_received(req);
+		return status;
+	}
+
+	*out_output_buffer = state->out_output_buffer;
+	talloc_steal(mem_ctx, out_output_buffer->data);
+
+	tevent_req_received(req);
+	return NT_STATUS_OK;
+}