s4: smbd: implement stream_socket_named_pipe()

For now implement just a very simple protocol
to negotiate the transport session info.

We may need to pass more info later,
e.g. client ip or name...

metze

1 files changed, 366 insertions, 0 deletions

diff --git a/source4/smbd/service_named_pipe.c b/source4/smbd/service_named_pipe.c
new file mode 100644
index 0000000000..b2b102c01f
--- /dev/null
+++ b/source4/smbd/service_named_pipe.c
@@ -0,0 +1,366 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   helper functions for NAMED PIPE servers
+
+   Copyright (C) Stefan (metze) Metzmacher	2008
+
+   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 "lib/socket/socket.h"
+#include "smbd/service.h"
+#include "param/param.h"
+#include "auth/session.h"
+#include "lib/stream/packet.h"
+#include "librpc/gen_ndr/ndr_named_pipe_auth.h"
+#include "system/passwd.h"
+
+struct named_pipe_socket {
+	const char *pipe_name;
+	const char *pipe_path;
+	const struct stream_server_ops *ops;
+	void *private_data;
+};
+
+struct named_pipe_connection {
+	struct stream_connection *connection;
+	struct packet_context *packet;
+	const struct named_pipe_socket *pipe_sock;
+	NTSTATUS status;
+};
+
+static void named_pipe_handover_connection(void *private_data)
+{
+	struct named_pipe_connection *pipe_conn = talloc_get_type(
+		private_data, struct named_pipe_connection);
+	struct stream_connection *conn = pipe_conn->connection;
+
+	EVENT_FD_NOT_WRITEABLE(conn->event.fde);
+
+	if (!NT_STATUS_IS_OK(pipe_conn->status)) {
+		stream_terminate_connection(conn, nt_errstr(pipe_conn->status));
+		return;
+	}
+
+	/*
+	 * remove the named_pipe layer together with its packet layer
+	 */
+	conn->ops	= pipe_conn->pipe_sock->ops;
+	conn->private	= pipe_conn->pipe_sock->private_data;
+	talloc_free(pipe_conn);
+
+	/* we're now ready to start receiving events on this stream */
+	EVENT_FD_READABLE(conn->event.fde);
+
+	/*
+	 * hand over to the real pipe implementation,
+	 * now that we have setup the transport session_info
+	 */
+	conn->ops->accept_connection(conn);
+
+	DEBUG(10,("named_pipe_handover_connection[%s]: succeeded\n",
+	      conn->ops->name));
+}
+
+static NTSTATUS named_pipe_recv_auth_request(void *private_data,
+					     DATA_BLOB req_blob)
+{
+	struct named_pipe_connection *pipe_conn = talloc_get_type(
+		private_data, struct named_pipe_connection);
+	struct stream_connection *conn = pipe_conn->connection;
+	enum ndr_err_code ndr_err;
+	struct named_pipe_auth_req req;
+	union netr_Validation val;
+	struct auth_serversupplied_info *server_info;
+	struct named_pipe_auth_rep rep;
+	DATA_BLOB rep_blob;
+	NTSTATUS status;
+
+	/*
+	 * make sure nothing happens on the socket untill the
+	 * real implemenation takes over
+	 */
+	packet_recv_disable(pipe_conn->packet);
+
+	/*
+	 * TODO: check it's a root (uid == 0) pipe
+	 */
+
+	ZERO_STRUCT(rep);
+	rep.level = 0;
+	rep.status = NT_STATUS_INTERNAL_ERROR;
+
+	DEBUG(10,("named_pipe_auth: req_blob.length[%u]\n",
+		  (unsigned int)req_blob.length));
+	dump_data(10, req_blob.data, req_blob.length);
+
+	/* parse the passed credentials */
+	ndr_err = ndr_pull_struct_blob_all(
+			&req_blob,
+			pipe_conn,
+			lp_iconv_convenience(conn->lp_ctx),
+			&req,
+			(ndr_pull_flags_fn_t)ndr_pull_named_pipe_auth_req);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		rep.status = ndr_map_error2ntstatus(ndr_err);
+		DEBUG(2, ("Could not unmarshall named_pipe_auth_req: %s\n",
+			  nt_errstr(rep.status)));
+		goto reply;
+	}
+
+	if (strcmp(NAMED_PIPE_AUTH_MAGIC, req.magic) != 0) {
+		DEBUG(2, ("named_pipe_auth_req: invalid magic '%s' != %s\n",
+			  req.magic, NAMED_PIPE_AUTH_MAGIC));
+		rep.status = NT_STATUS_INVALID_PARAMETER;
+		goto reply;
+	}
+
+	switch (req.level) {
+	case 0:
+		/*
+		 * anon connection, we don't create a session info
+		 * and leave it NULL
+		 */
+		rep.level = 0;
+		rep.status = NT_STATUS_OK;
+		break;
+	case 1:
+		val.sam3 = &req.info.info1;
+
+		rep.level = 1;
+		rep.status = make_server_info_netlogon_validation(pipe_conn,
+								  "TODO",
+								  3, &val,
+								  &server_info);
+		if (!NT_STATUS_IS_OK(rep.status)) {
+			DEBUG(2, ("make_server_info_netlogon_validation returned "
+				  "%s\n", nt_errstr(rep.status)));
+			goto reply;
+		}
+
+		/* setup the session_info on the connection */
+		rep.status = auth_generate_session_info(conn,
+							conn->event.ctx,
+							conn->lp_ctx,
+							server_info,
+							&conn->session_info);
+		if (!NT_STATUS_IS_OK(rep.status)) {
+			DEBUG(2, ("auth_generate_session_info failed: %s\n",
+				  nt_errstr(rep.status)));
+			goto reply;
+		}
+
+		break;
+	default:
+		DEBUG(2, ("named_pipe_auth_req: unknown level %u\n",
+			  req.level));
+		rep.level = 0;
+		rep.status = NT_STATUS_INVALID_LEVEL;
+		goto reply;
+	}
+
+reply:
+	/* create the output */
+	ndr_err = ndr_push_struct_blob(&rep_blob, pipe_conn,
+			lp_iconv_convenience(conn->lp_ctx),
+			&rep,
+			(ndr_push_flags_fn_t)ndr_push_named_pipe_auth_rep);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		status = ndr_map_error2ntstatus(ndr_err);
+		DEBUG(2, ("Could not marshall named_pipe_auth_rep: %s\n",
+			  nt_errstr(status)));
+		return status;
+	}
+
+	pipe_conn->status = rep.status;
+
+	DEBUG(10,("named_pipe_auth reply[%u]\n", rep_blob.length));
+	dump_data(10, rep_blob.data, rep_blob.length);
+	status = packet_send_callback(pipe_conn->packet, rep_blob,
+				      named_pipe_handover_connection,
+				      pipe_conn);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0, ("packet_send_callback returned %s\n",
+			  nt_errstr(status)));
+		return status;
+	}
+
+	return NT_STATUS_OK;
+}
+
+/*
+  called when a pipe socket becomes readable
+*/
+static void named_pipe_recv(struct stream_connection *conn, uint16_t flags)
+{
+	struct named_pipe_connection *pipe_conn = talloc_get_type(
+		conn->private, struct named_pipe_connection);
+
+	DEBUG(10,("named_pipe_recv\n"));
+
+	packet_recv(pipe_conn->packet);
+}
+
+/*
+  called when a pipe socket becomes writable
+*/
+static void named_pipe_send(struct stream_connection *conn, uint16_t flags)
+{
+	struct named_pipe_connection *pipe_conn = talloc_get_type(
+		conn->private, struct named_pipe_connection);
+
+	packet_queue_run(pipe_conn->packet);
+}
+
+/*
+  handle socket recv errors
+*/
+static void named_pipe_recv_error(void *private_data, NTSTATUS status)
+{
+	struct named_pipe_connection *pipe_conn = talloc_get_type(
+		private_data, struct named_pipe_connection);
+
+	stream_terminate_connection(pipe_conn->connection, nt_errstr(status));
+}
+
+static NTSTATUS named_pipe_full_request(void *private, DATA_BLOB blob, size_t *size)
+{
+	if (blob.length < 8) {
+		return STATUS_MORE_ENTRIES;
+	}
+
+	if (memcmp(NAMED_PIPE_AUTH_MAGIC, &blob.data[4], 4) != 0) {
+		DEBUG(0,("named_pipe_full_request: wrong protocol\n"));
+		*size = blob.length;
+		/* the error will be handled in named_pipe_recv_auth_request */
+		return NT_STATUS_OK;
+	}
+
+	*size = 4 + RIVAL(blob.data, 0);
+	if (*size > blob.length) {
+		return STATUS_MORE_ENTRIES;
+	}
+
+	return NT_STATUS_OK;
+}
+
+static void named_pipe_accept(struct stream_connection *conn)
+{
+	struct named_pipe_socket *pipe_sock = talloc_get_type(
+		conn->private, struct named_pipe_socket);
+	struct named_pipe_connection *pipe_conn;
+
+	DEBUG(5,("named_pipe_accept\n"));
+
+	pipe_conn = talloc_zero(conn, struct named_pipe_connection);
+	if (!pipe_conn) {
+		stream_terminate_connection(conn, "out of memory");
+		return;
+	}
+
+	pipe_conn->packet = packet_init(pipe_conn);
+	if (!pipe_conn->packet) {
+		stream_terminate_connection(conn, "out of memory");
+		return;
+	}
+	packet_set_private(pipe_conn->packet, pipe_conn);
+	packet_set_socket(pipe_conn->packet, conn->socket);
+	packet_set_callback(pipe_conn->packet, named_pipe_recv_auth_request);
+	packet_set_full_request(pipe_conn->packet, named_pipe_full_request);
+	packet_set_error_handler(pipe_conn->packet, named_pipe_recv_error);
+	packet_set_event_context(pipe_conn->packet, conn->event.ctx);
+	packet_set_fde(pipe_conn->packet, conn->event.fde);
+	packet_set_serialise(pipe_conn->packet);
+	packet_set_initial_read(pipe_conn->packet, 8);
+
+	pipe_conn->pipe_sock = pipe_sock;
+
+	pipe_conn->connection = conn;
+	conn->private = pipe_conn;
+}
+
+static const struct stream_server_ops named_pipe_stream_ops = {
+	.name			= "named_pipe",
+	.accept_connection	= named_pipe_accept,
+	.recv_handler		= named_pipe_recv,
+	.send_handler		= named_pipe_send,
+};
+
+NTSTATUS stream_setup_named_pipe(struct event_context *event_context,
+				 struct loadparm_context *lp_ctx,
+				 const struct model_ops *model_ops,
+				 const struct stream_server_ops *stream_ops,
+				 const char *pipe_name,
+				 void *private_data)
+{
+	char *dirname;
+	struct named_pipe_socket *pipe_sock;
+	NTSTATUS status = NT_STATUS_NO_MEMORY;;
+
+	pipe_sock = talloc(event_context, struct named_pipe_socket);
+	if (pipe_sock == NULL) {
+		goto fail;
+	}
+
+	/* remember the details about the pipe */
+	pipe_sock->pipe_name	= talloc_strdup(pipe_sock, pipe_name);
+	if (pipe_sock->pipe_name == NULL) {
+		goto fail;
+	}
+
+	dirname = talloc_asprintf(pipe_sock, "%s/np", lp_ncalrpc_dir(lp_ctx));
+	if (dirname == NULL) {
+		goto fail;
+	}
+
+	if (!directory_create_or_exist(dirname, geteuid(), 0700)) {
+		status = map_nt_error_from_unix(errno);
+		goto fail;
+	}
+
+	if (strncmp(pipe_name, "\\pipe\\", 6) == 0) {
+		pipe_name += 6;
+	}
+
+	pipe_sock->pipe_path = talloc_asprintf(pipe_sock, "%s/%s", dirname,
+					       pipe_name);
+	if (pipe_sock->pipe_path == NULL) {
+		goto fail;
+	}
+
+	talloc_free(dirname);
+
+	pipe_sock->ops		= stream_ops;
+	pipe_sock->private_data	= talloc_reference(pipe_sock, private_data);
+
+	status = stream_setup_socket(event_context,
+				     lp_ctx,
+				     model_ops,
+				     &named_pipe_stream_ops,
+				     "unix",
+				     pipe_sock->pipe_path,
+				     NULL,
+				     NULL,
+				     pipe_sock);
+	if (!NT_STATUS_IS_OK(status)) {
+		goto fail;
+	}
+	return NT_STATUS_OK;
+
+ fail:
+	talloc_free(pipe_sock);
+	return status;
+}