Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 148 insertions, 0 deletions

diff --git a/source3/smbd/conn_msg.c b/source3/smbd/conn_msg.c
new file mode 100644
index 0000000..9435d38
--- /dev/null
+++ b/source3/smbd/conn_msg.c
@@ -0,0 +1,148 @@
+/*
+   Unix SMB/CIFS implementation.
+   Manage connections_struct structures
+   Copyright (C) Andrew Tridgell 1998
+   Copyright (C) Alexander Bokovoy 2002
+   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 "smbd/smbd.h"
+#include "smbd/globals.h"
+
+/****************************************************************************
+ Receive a smbcontrol message to forcibly unmount a share.
+ The message contains just a share name and all instances of that
+ share are unmounted.
+ The special sharename '*' forces unmount of all shares.
+****************************************************************************/
+
+struct force_tdis_state {
+	const char *sharename;
+};
+
+static bool force_tdis_check(
+	struct connection_struct *conn,
+	void *private_data)
+{
+	struct force_tdis_state *state = private_data;
+	const struct loadparm_substitution *lp_sub =
+		loadparm_s3_global_substitution();
+	char *servicename = NULL;
+	bool do_close;
+
+	if (strcmp(state->sharename, "*") == 0) {
+		DBG_WARNING("Forcing close of all shares\n");
+		return true;
+	}
+
+	servicename = lp_servicename(talloc_tos(), lp_sub, SNUM(conn));
+	do_close = strequal(servicename, state->sharename);
+
+	TALLOC_FREE(servicename);
+
+	return do_close;
+}
+
+void msg_force_tdis(struct messaging_context *msg,
+		    void *private_data,
+		    uint32_t msg_type,
+		    struct server_id server_id,
+		    DATA_BLOB *data)
+{
+	struct force_tdis_state state = {
+		.sharename = (const char *)data->data,
+	};
+	struct smbd_server_connection *sconn =
+		talloc_get_type_abort(private_data,
+		struct smbd_server_connection);
+
+	if ((data->length == 0) || (data->data[data->length-1] != 0)) {
+		DBG_WARNING("Ignoring invalid sharename\n");
+		return;
+	}
+
+	conn_force_tdis(sconn, force_tdis_check, &state);
+}
+
+static bool force_tdis_denied_check(
+	struct connection_struct *conn,
+	void *private_data)
+{
+	bool do_close;
+	uint32_t share_access;
+	bool read_only;
+	NTSTATUS status;
+
+	do_close = force_tdis_check(conn, private_data);
+	if (!do_close) {
+		return false;
+	}
+
+	status = check_user_share_access(
+		conn,
+		conn->session_info,
+		&share_access,
+		&read_only);
+	if (!NT_STATUS_IS_OK(status)) {
+		DBG_DEBUG("check_user_share_access returned %s\n",
+			  nt_errstr(status));
+		return true;	/* close the share */
+	}
+
+	if (conn->share_access != share_access) {
+		DBG_DEBUG("share_access changed from %"PRIx32" to %"PRIx32"\n",
+			  conn->share_access, share_access);
+		return true;	/* close the share */
+	}
+
+	if (conn->read_only != read_only) {
+		DBG_DEBUG("read_only changed from %s to %s\n",
+			  conn->read_only ? "true" : "false",
+			  read_only ? "true" : "false");
+		return true;	/* close the share */
+	}
+
+	/*
+	 * all still ok, keep the connection open
+	 */
+	return false;
+}
+
+void msg_force_tdis_denied(
+	struct messaging_context *msg,
+	void *private_data,
+	uint32_t msg_type,
+	struct server_id server_id,
+	DATA_BLOB *data)
+{
+	struct force_tdis_state state = {
+		.sharename = (const char *)data->data,
+	};
+	struct smbd_server_connection *sconn =
+		talloc_get_type_abort(private_data,
+		struct smbd_server_connection);
+
+	if ((data->length == 0) || (data->data[data->length-1] != 0)) {
+		DBG_WARNING("Ignoring invalid sharename\n");
+		return;
+	}
+
+	change_to_root_user();
+	reload_services(sconn, conn_snum_used, false);
+
+	conn_force_tdis(sconn, force_tdis_denied_check, &state);
+}