dbus.c

1 files changed, 58 insertions, 0 deletions

diff --git a/src/firejail/dbus.c b/src/firejail/dbus.c
new file mode 100644
index 000000000..eee3e2a35
--- /dev/null
+++ b/src/firejail/dbus.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2014-2018 Firejail Authors
+ *
+ * This file is part of firejail project
+ *
+ * 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 "firejail.h"
+
+void dbus_session_disable(void) {
+        char *path;
+        if (asprintf(&path, "/run/user/%d/bus", getuid()) == -1)
+                errExit("asprintf");
+        char *env_var;
+        if (asprintf(&env_var, "DBUS_SESSION_BUS_ADDRESS=unix:path=%s", path) == -1)
+                errExit("asprintf");
+
+        // set a new environment variable: DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/<UID>/bus
+        if (setenv("DBUS_SESSION_BUS_ADDRESS", env_var, 1) == -1) {
+                fprintf(stderr, "Error: cannot modify DBUS_SESSION_BUS_ADDRESS required by --nodbus\n");
+                exit(1);
+        }
+
+        // blacklist the path
+        disable_file_or_dir(path);
+        free(path);
+        free(env_var);
+
+        // look for a possible abstract unix socket
+
+        // --net=none
+        if (arg_nonetwork)
+                return;
+
+        // --net=eth0
+        if (any_bridge_configured())
+                return;
+
+        // --protocol=unix
+#ifdef HAVE_SECCOMP
+        if (cfg.protocol && !strstr(cfg.protocol, "unix"))
+                return;
+#endif
+
+        fwarning("An abstract unix socket for session D-BUS might still be available. Use --net or remove unix from --protocol set.\n");
+}