Run BoringSSL self test during startup
NIAP certification requires that all cryptographic functions
undergo a self-test during startup to demonstrate correct
operation. This change adds such a check.
If the check fails, it will prevent the device from booting
by rebooting into the bootloader.
Bug: 119826244
Test: Built for walleye. After device booted examined dmesg and
observed logs from init showing that the new task did
start. Further, when BoringSSL is built to fail its self
check the device did stop during a normal boot and enter
the bootloader, and did so before the boot animation stopped.
Change-Id: I4df375cfcdbadcae7f67b01441fef6e729312807
Merged-In: I07a5dc73a314502c87de566bb26f4d73499d2675
diff --git a/init/Android.bp b/init/Android.bp
index 70a4ac6..63c8382 100644
--- a/init/Android.bp
+++ b/init/Android.bp
@@ -95,6 +95,7 @@
"action.cpp",
"action_manager.cpp",
"action_parser.cpp",
+ "boringssl_self_test.cpp",
"bootchart.cpp",
"builtins.cpp",
"capabilities.cpp",
diff --git a/init/boringssl_self_test.cpp b/init/boringssl_self_test.cpp
new file mode 100644
index 0000000..850f1aa
--- /dev/null
+++ b/init/boringssl_self_test.cpp
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "boringssl_self_test.h"
+
+#include <android-base/logging.h>
+#include <cutils/android_reboot.h>
+#include <openssl/crypto.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+namespace android {
+namespace init {
+
+Result<Success> StartBoringSslSelfTest(const BuiltinArguments&) {
+ pid_t id = fork();
+
+ if (id == 0) {
+ if (BORINGSSL_self_test() != 1) {
+ LOG(INFO) << "BoringSSL crypto self tests failed";
+
+ // This check has failed, so the device should refuse
+ // to boot. Rebooting to bootloader to wait for
+ // further action from the user.
+
+ int result =
+ android_reboot(ANDROID_RB_RESTART2, 0, "bootloader,boringssl-self-check-failed");
+ if (result != 0) {
+ LOG(ERROR) << "Failed to reboot into bootloader";
+ }
+ }
+
+ _exit(0);
+ } else if (id == -1) {
+ // Failed to fork, so cannot run the test. Refuse to continue.
+ PLOG(FATAL) << "Failed to fork for BoringSSL self test";
+ }
+
+ return Success();
+}
+
+} // namespace init
+} // namespace android
diff --git a/init/boringssl_self_test.h b/init/boringssl_self_test.h
new file mode 100644
index 0000000..b21fc78
--- /dev/null
+++ b/init/boringssl_self_test.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "builtin_arguments.h"
+#include "result.h"
+
+namespace android {
+namespace init {
+
+Result<Success> StartBoringSslSelfTest(const BuiltinArguments&);
+
+} // namespace init
+} // namespace android
diff --git a/init/init.cpp b/init/init.cpp
index 4fe115e..fc58eea 100644
--- a/init/init.cpp
+++ b/init/init.cpp
@@ -47,6 +47,7 @@
#include <optional>
#include "action_parser.h"
+#include "boringssl_self_test.h"
#include "import_parser.h"
#include "init_first_stage.h"
#include "keychords.h"
@@ -731,6 +732,9 @@
// Trigger all the boot actions to get us started.
am.QueueEventTrigger("init");
+ // Starting the BoringSSL self test, for NIAP certification compliance.
+ am.QueueBuiltinAction(StartBoringSslSelfTest, "StartBoringSslSelfTest");
+
// Repeat mix_hwrng_into_linux_rng in case /dev/hw_random or /dev/random
// wasn't ready immediately after wait_for_coldboot_done
am.QueueBuiltinAction(MixHwrngIntoLinuxRngAction, "MixHwrngIntoLinuxRng");
