GUI: Disable general sandbox due to inpracticability

Qt is usually built with Accessibility and D-Bus. If D-Bus
connections work, a bypass should be considered trivial.
If we block D-Bus, we experience quite some slowdowns in
certain contexts. That's because Qt makes D-Bus connections
for accessibility features etc. They appear to run into timeouts,
but this slows down things. Sandboxing also makes things
like showing (native) file picker dialogs harder.

Sandboxing efforts will focus on the critical paths such as
the existing Indexer sandbox and the to be implemented sandboxing
for preview generation.

We keep no_new_privs for now as chances are that this shouldn't hurt.

gui/main.cpp

@@ -14,63 +14,16 @@
 #include "../submodules/exile.h/exile.h"
 #include "ipcserver.h"
 
-void enableSandbox(QString socketPath)
+void enableSandbox()
 {
-	struct exile_policy *policy = exile_init_policy();
+	struct exile_policy *policy = exile_create_policy();
 	if(policy == NULL)
 	{
 		qCritical() << "Failed to init policy for sandbox";
 		exit(EXIT_FAILURE);
 	}
-	QDir dir;
+	policy->namespace_options = 0;
-	dir.mkpath(QStandardPaths::writableLocation(QStandardPaths::AppLocalDataLocation));
+	policy->no_new_privs = 1;
-	dir.mkpath(QStandardPaths::writableLocation(QStandardPaths::CacheLocation));
-
-	std::string appDataLocation = QStandardPaths::writableLocation(QStandardPaths::AppLocalDataLocation).toStdString();
-	std::string cacheDataLocation = QStandardPaths::writableLocation(QStandardPaths::CacheLocation).toStdString();
-	std::string configDataLocation = QStandardPaths::writableLocation(QStandardPaths::ConfigLocation).toStdString();
-
-	std::string sockPath = socketPath.toStdString();
-	std::string dbPath = QFileInfo(Common::databasePath()).absolutePath().toStdString();
-	std::string mySelf = QFileInfo("/proc/self/exe").symLinkTarget().toStdString();
-	policy->namespace_options = EXILE_UNSHARE_USER;
-	if(exile_append_path_policies(policy, EXILE_FS_ALLOW_ALL_READ, "/") != 0)
-	{
-		qCritical() << "Failed to append a path to the path policy";
-		exit(EXIT_FAILURE);
-	}
-
-	if(exile_append_path_policies(policy, EXILE_FS_ALLOW_ALL_READ | EXILE_FS_ALLOW_ALL_WRITE,
-								  appDataLocation.c_str()) != 0)
-	{
-		qCritical() << "Failed to append appDataLocation path to the path policy";
-		exit(EXIT_FAILURE);
-	}
-	if(exile_append_path_policies(policy, EXILE_FS_ALLOW_ALL_READ | EXILE_FS_ALLOW_ALL_WRITE,
-								  cacheDataLocation.c_str()) != 0)
-	{
-		qCritical() << "Failed to append cacheDataLocation path to the path policy";
-		exit(EXIT_FAILURE);
-	}
-	if(exile_append_path_policies(policy,
-								  EXILE_FS_ALLOW_ALL_READ | EXILE_FS_ALLOW_REMOVE_FILE | EXILE_FS_ALLOW_ALL_WRITE,
-								  dbPath.c_str()) != 0)
-	{
-		qCritical() << "Failed to append dbPath path to the path policy";
-		exit(EXIT_FAILURE);
-	}
-	if(exile_append_path_policies(policy, EXILE_FS_ALLOW_ALL_READ | EXILE_FS_ALLOW_EXEC, mySelf.c_str(), "/lib64",
-								  "/lib") != 0)
-	{
-		qCritical() << "Failed to append mySelf path to the path policy";
-		exit(EXIT_FAILURE);
-	}
-	if(exile_append_path_policies(policy, EXILE_FS_ALLOW_ALL_READ | EXILE_FS_ALLOW_ALL_WRITE,
-								  configDataLocation.c_str()) != 0)
-	{
-		qCritical() << "Failed to append configDataLocation path to the path policy";
-		exit(EXIT_FAILURE);
-	}
 	int ret = exile_enable_policy(policy);
 	if(ret != 0)
 	{
@@ -141,7 +94,7 @@ int main(int argc, char *argv[])
 		Common::ensureConfigured();
 		if(!parser.isSet("no-sandbox"))
 		{
-			enableSandbox(socketPath);
+			enableSandbox();
 			qInfo() << "Sandbox: on";
 		}
 		else
@@ -167,6 +120,5 @@ int main(int argc, char *argv[])
 	IPCClient client{socketPath};
 	MainWindow w{0, client};
 	w.showMaximized();
-
 	return a.exec();
 }