1 files changed, 73 insertions, 0 deletions
diff --git a/src/ClientFile.cxx b/src/ClientFile.cxx
new file mode 100644
index 000000000..07fa767b0
--- /dev/null
+++ b/src/ClientFile.cxx
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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 2 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "ClientFile.hxx"
+#include "Client.hxx"
+#include "ack.h"
+#include "io_error.h"
+#include "fs/Path.hxx"
+#include "fs/FileSystem.hxx"
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <unistd.h>
+
+bool
+client_allow_file(const Client *client, const Path &path_fs,
+		  GError **error_r)
+{
+#ifdef WIN32
+	(void)client;
+	(void)path_fs;
+
+	g_set_error(error_r, ack_quark(), ACK_ERROR_PERMISSION,
+		    "Access denied");
+	return false;
+#else
+	const int uid = client_get_uid(client);
+	if (uid >= 0 && (uid_t)uid == geteuid())
+		/* always allow access if user runs his own MPD
+		   instance */
+		return true;
+
+	if (uid <= 0) {
+		/* unauthenticated client */
+		g_set_error(error_r, ack_quark(), ACK_ERROR_PERMISSION,
+			    "Access denied");
+		return false;
+	}
+
+	struct stat st;
+	if (!StatFile(path_fs, st)) {
+		set_error_errno(error_r);
+		return false;
+	}
+
+	if (st.st_uid != (uid_t)uid && (st.st_mode & 0444) != 0444) {
+		/* client is not owner */
+		g_set_error(error_r, ack_quark(), ACK_ERROR_PERMISSION,
+			    "Access denied");
+		return false;
+	}
+
+	return true;
+#endif
+}