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-rw-r--r--src/ClientFile.cxx70
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diff --git a/src/ClientFile.cxx b/src/ClientFile.cxx
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+++ b/src/ClientFile.cxx
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+/*
+ * 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 "ClientFile.hxx"
+#include "Client.hxx"
+#include "ack.h"
+#include "io_error.h"
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <unistd.h>
+
+bool
+client_allow_file(const Client *client, const char *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 (stat(path_fs, &st) < 0) {
+ 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
+}