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authorLennart Poettering <lennart@poettering.net>2013-11-21 23:36:51 +0100
committerLennart Poettering <lennart@poettering.net>2013-11-21 23:36:51 +0100
commit969987ea93a7fdcd2c87b551eb0adf0bd9338b32 (patch)
tree977186164514497136688bba7357662a60e6751a /src
parent9f5eb56a13dee1085cbf2560ac3afd73f72402cb (diff)
bus: restore selinux access control to PID 1 for properties
Diffstat (limited to 'src')
-rw-r--r--src/core/dbus.c69
-rw-r--r--src/libsystemd-bus/sd-bus.c2
2 files changed, 70 insertions, 1 deletions
diff --git a/src/core/dbus.c b/src/core/dbus.c
index 3d8da1e6ad..1cb4d0fa7d 100644
--- a/src/core/dbus.c
+++ b/src/core/dbus.c
@@ -42,6 +42,8 @@
#include "bus-errors.h"
#include "strxcpyx.h"
#include "dbus-client-track.h"
+#include "bus-internal.h"
+#include "selinux-access.h"
#define CONNECTIONS_MAX 512
@@ -209,6 +211,67 @@ failed:
return 0;
}
+static int selinux_filter(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
+ Manager *m = userdata;
+ const char *verb, *path;
+ Unit *u = NULL;
+ Job *j;
+ int r;
+
+ assert(bus);
+ assert(message);
+
+ /* Our own method calls are all protected individually with
+ * selinux checks, but the built-in interfaces need to be
+ * protected too. */
+
+ if (sd_bus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Set"))
+ verb = "reload";
+ else if (sd_bus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", NULL) ||
+ sd_bus_message_is_method_call(message, "org.freedesktop.DBus.Properties", NULL) ||
+ sd_bus_message_is_method_call(message, "org.freedesktop.DBus.ObjectManager", NULL) ||
+ sd_bus_message_is_method_call(message, "org.freedesktop.DBus.Peer", NULL))
+ verb = "status";
+ else
+ return 0;
+
+ path = sd_bus_message_get_path(message);
+
+ if (object_path_startswith("/org/freedesktop/systemd1", path)) {
+
+ r = selinux_access_check(bus, message, verb, error);
+ if (r < 0)
+ return r;
+
+ return 0;
+ }
+
+ if (streq_ptr(path, "/org/freedesktop/systemd1/unit/self")) {
+ pid_t pid;
+
+ r = sd_bus_get_owner_pid(bus, sd_bus_message_get_sender(message), &pid);
+ if (r < 0)
+ return 0;
+
+ u = manager_get_unit_by_pid(m, pid);
+ } else {
+ r = manager_get_job_from_dbus_path(m, path, &j);
+ if (r >= 0)
+ u = j->unit;
+ else
+ manager_load_unit_from_dbus_path(m, path, NULL, &u);
+ }
+
+ if (!u)
+ return 0;
+
+ r = selinux_unit_access_check(u, bus, message, verb, error);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
static int bus_job_find(sd_bus *bus, const char *path, const char *interface, void **found, void *userdata) {
Manager *m = userdata;
Job *j;
@@ -458,6 +521,12 @@ static int bus_setup_api_vtables(Manager *m, sd_bus *bus) {
assert(m);
assert(bus);
+ r = sd_bus_add_filter(bus, selinux_filter, m);
+ if (r < 0) {
+ log_error("Failed to add SELinux access filter: %s", strerror(-r));
+ return r;
+ }
+
r = sd_bus_add_object_vtable(bus, "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", bus_manager_vtable, m);
if (r < 0) {
log_error("Failed to register Manager vtable: %s", strerror(-r));
diff --git a/src/libsystemd-bus/sd-bus.c b/src/libsystemd-bus/sd-bus.c
index 2604434467..4df649c9f7 100644
--- a/src/libsystemd-bus/sd-bus.c
+++ b/src/libsystemd-bus/sd-bus.c
@@ -1945,7 +1945,7 @@ static int process_filter(sd_bus *bus, sd_bus_message *m) {
if (r < 0)
return r;
- r = l->callback(bus, m, &error_buffer, l->userdata);
+ r = l->callback(bus, m, l->userdata, &error_buffer);
r = bus_maybe_reply_error(m, r, &error_buffer);
if (r != 0)
return r;