Added policy_engine_fuzzer
exec/s: 600 Test: ./policy_engine_fuzzer Bug: 265234582 Change-Id: I1be1f040cfef4d8c7f80de92f26b2e086327658e
This commit is contained in:
Akshata Kadam
committed by
Akshata Kadam
Akshata Kadam
parent
d9b24af07f
commit
2ce71b64be
71
fuzzer/Android.bp
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71
fuzzer/Android.bp
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/*
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* Copyright (C) 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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cc_defaults {
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name: "libcdm_fuzzer_defaults",
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cflags: [
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"-DDYNAMIC_ADAPTER",
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],
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static_libs: [
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"libcdm",
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"libcdm_protos",
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"libcdm_utils",
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"libwvlevel3",
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"libwv_odk",
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"libjsmn",
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],
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shared_libs: [
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"libcrypto",
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"libprotobuf-cpp-lite",
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"libbinder_ndk",
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"liblog",
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"libbase",
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"libutils",
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],
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include_dirs: [
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"vendor/widevine/libwvdrmengine/cdm/core/include",
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"vendor/widevine/libwvdrmengine/cdm/metrics/include",
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"vendor/widevine/libwvdrmengine/cdm/util/include",
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"vendor/widevine/libwvdrmengine/cdm/include",
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"vendor/widevine/libwvdrmengine/oemcrypto/include",
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"vendor/widevine/libwvdrmengine/oemcrypto/odk/include",
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"external/jsmn",
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"external/protobuf/src"
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],
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header_libs: ["libutils_headers"],
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fuzz_config: {
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cc: [
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"android-media-fuzzing-reports@google.com",
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],
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componentid: 59148,
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untrusted_data: true,
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critical: false,
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hotlists: ["4593311"],
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description: "The fuzzers target the APIs of all widevine modules",
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vector: "local_no_privileges_required",
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service_privilege: "privileged",
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users: "single_user",
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fuzzed_code_usage: "shipped"
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},
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proprietary: true,
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vendor: true,
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}
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cc_fuzz {
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name: "policy_engine_fuzzer",
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srcs: ["policy_engine_fuzzer.cpp"],
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defaults: ["libcdm_fuzzer_defaults"],
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}
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28
fuzzer/README.md
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28
fuzzer/README.md
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# Fuzzers for libcdm
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## Table of contents
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+ [policy_engine_fuzzer](#PolicyEngine)
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# <a name="PolicyEngine"></a> Fuzzer for PolicyEngine
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PolicyEngine supports the following parameters:
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1. SigningKeyId (parameter name: "kSigningKeyId")
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2. RenewalServerUrl (parameter name: "kRenewalServerUrl")
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3. EntitlementKeyId (parameter name: "kEntitlementKeyId")
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| Parameter| Valid Values| Configured Value|
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|------------- |-------------| ----- |
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|`kSigningKeyId`| `String` |Value obtained from FuzzedDataProvider|
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|`kRenewalServerUrl`| `String` |Value obtained from FuzzedDataProvider|
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|`kEntitlementKeyId`| `String` |Value obtained from FuzzedDataProvider|
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#### Steps to run
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1. Build the fuzzer
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```
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$ mm -j$(nproc) policy_engine_fuzzer
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```
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2. Run on device
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```
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$ adb sync data
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$ adb shell /data/fuzz/arm64/policy_engine_fuzzer/vendor/policy_engine_fuzzer
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```
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353
fuzzer/policy_engine_fuzzer.cpp
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353
fuzzer/policy_engine_fuzzer.cpp
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/*
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* Copyright (C) 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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#include "policy_engine.h"
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#include "wv_cdm_event_listener.h"
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#include <fuzzer/FuzzedDataProvider.h>
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using namespace wvcdm;
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using namespace wvcdm::metrics;
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using namespace video_widevine;
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static constexpr int32_t kLicenseIDVersion = 1;
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static constexpr int32_t kMaxByte = 256;
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static constexpr int32_t kMinResolution = 1;
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static constexpr int32_t kMaxResolution = 1024;
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static constexpr int32_t kMaxEntitledKey = 5;
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const KeyId kSigningKeyId = "signing_key";
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const KeyId kEntitlementKeyId = "entitlementkeyid";
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const char *kRenewalServerUrl =
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"https://test.google.com/license/GetCencLicense";
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class FuzzWvCdmEventListener : public WvCdmEventListener {
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void OnSessionRenewalNeeded(const CdmSessionId & /*session_id*/) {}
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void OnSessionKeysChange(const CdmSessionId & /*session_id*/,
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const CdmKeyStatusMap & /*keys_status*/,
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bool /*has_new_usable_key*/) {}
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void OnExpirationUpdate(const CdmSessionId & /*session_id*/,
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int64_t /*new_expiry_time_seconds*/) {}
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};
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class PolicyEngineFuzzer {
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public:
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PolicyEngineFuzzer(const uint8_t *data, size_t size) : mFdp(data, size){};
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void process();
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private:
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FuzzedDataProvider mFdp;
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KeyId mKeyId;
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License mLicense;
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void setUp();
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};
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void policySetBool(std::function<void(bool)> function,
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FuzzedDataProvider *fdp) {
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if (fdp->ConsumeBool()) {
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function(fdp->ConsumeBool());
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}
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}
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void policySetInt64(std::function<void(int64_t)> function,
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FuzzedDataProvider *fdp) {
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if (fdp->ConsumeBool()) {
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function(fdp->ConsumeIntegral<int64_t>());
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}
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}
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void PolicyEngineFuzzer::setUp() {
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License::KeyContainer *key = mLicense.add_key();
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int32_t keyType = mFdp.ConsumeIntegralInRange<uint8_t>(
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License::KeyContainer::SIGNING, License::KeyContainer::ENTITLEMENT);
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key->set_type((License_KeyContainer_KeyType)keyType);
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mKeyId = mFdp.ConsumeRandomLengthString(kMaxByte);
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LicenseIdentification *id = mLicense.mutable_id();
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if (mFdp.ConsumeBool()) {
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id->set_version(kLicenseIDVersion);
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}
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if (mFdp.ConsumeBool()) {
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id->set_type(mFdp.ConsumeBool() ? STREAMING : OFFLINE);
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}
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if (mFdp.ConsumeBool()) {
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id->set_provider_session_token(mFdp.ConsumeRandomLengthString(kMaxByte));
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}
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if (mFdp.ConsumeBool()) {
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mLicense.set_license_start_time(mFdp.ConsumeIntegral<int64_t>());
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}
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if (mFdp.ConsumeBool()) {
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License_KeyContainer_OutputProtection *outputProtection =
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key->mutable_required_protection();
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License_KeyContainer_OutputProtection_HDCP hdcpLevel =
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(License_KeyContainer_OutputProtection_HDCP)mFdp
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.ConsumeIntegralInRange<uint8_t>(HDCP_NONE, HDCP_NO_DIGITAL_OUTPUT);
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outputProtection->set_hdcp(hdcpLevel);
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}
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if (mFdp.ConsumeBool()) {
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const std::string ivString = mFdp.ConsumeRandomLengthString(kMaxByte);
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key->set_iv(ivString);
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}
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switch (keyType) {
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case License::KeyContainer::SIGNING: {
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if (mFdp.ConsumeBool()) {
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mKeyId = mFdp.ConsumeBool() ? kSigningKeyId : mKeyId;
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key->set_id(mKeyId);
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}
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break;
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}
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case License::KeyContainer::CONTENT: {
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if (mFdp.ConsumeBool()) {
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key->set_id(mKeyId);
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}
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if (mFdp.ConsumeBool()) {
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int32_t level = mFdp.ConsumeIntegralInRange<uint8_t>(
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License::KeyContainer::SW_SECURE_CRYPTO,
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License::KeyContainer::HW_SECURE_ALL);
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key->set_level((License_KeyContainer_SecurityLevel)level);
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}
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License_Policy *policy = mLicense.mutable_policy();
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policySetBool(
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std::bind(&License_Policy::set_can_play, policy, std::placeholders::_1),
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&mFdp);
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policySetBool(std::bind(&License_Policy::set_can_persist, policy,
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std::placeholders::_1), &mFdp);
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policySetBool(std::bind(&License_Policy::set_can_renew, policy,
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std::placeholders::_1), &mFdp);
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policySetBool(std::bind(&License_Policy::set_renew_with_usage, policy,
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std::placeholders::_1), &mFdp);
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policySetBool(std::bind(&License_Policy::set_soft_enforce_rental_duration,
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policy, std::placeholders::_1), &mFdp);
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policySetBool(std::bind(&License_Policy::set_soft_enforce_playback_duration,
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policy, std::placeholders::_1), &mFdp);
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policySetInt64(std::bind(&License_Policy::set_rental_duration_seconds,
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policy, std::placeholders::_1), &mFdp);
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policySetInt64(std::bind(&License_Policy::set_playback_duration_seconds,
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policy, std::placeholders::_1), &mFdp);
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policySetInt64(std::bind(&License_Policy::set_license_duration_seconds,
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policy, std::placeholders::_1), &mFdp);
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policySetInt64(
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std::bind(&License_Policy::set_renewal_recovery_duration_seconds,
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policy, std::placeholders::_1), &mFdp);
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policySetInt64(
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std::bind(&License_Policy::set_renewal_retry_interval_seconds, policy,
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std::placeholders::_1), &mFdp);
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policySetInt64(
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std::bind(&License_Policy::set_renewal_delay_seconds, policy,
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std::placeholders::_1), &mFdp);
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if (mFdp.ConsumeBool()) {
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video_widevine::License::Policy::TimerDelayBase timeDelayBase =
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(video_widevine::License::Policy::TimerDelayBase)mFdp.ConsumeIntegralInRange<uint8_t>(
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License_Policy_TimerDelayBase_TIMER_DELAY_BASE_UNSPECIFIED ,
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License_Policy_TimerDelayBase_FIRST_DECRYPT);
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policy->set_initial_renewal_delay_base(timeDelayBase);
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}
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if (mFdp.ConsumeBool()) {
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std::string serverUrl = mFdp.ConsumeBool()
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? kRenewalServerUrl
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: mFdp.ConsumeRandomLengthString(kMaxByte);
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policy->set_renewal_server_url(serverUrl);
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}
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break;
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}
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case License::KeyContainer::KEY_CONTROL: {
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key->set_type(License::KeyContainer::KEY_CONTROL);
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// No control bits for this type of key container used for license
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break;
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}
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case License::KeyContainer::OPERATOR_SESSION: {
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key->set_type(License::KeyContainer::OPERATOR_SESSION);
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if (mFdp.ConsumeBool()) {
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key->set_id(mKeyId);
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}
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if (mFdp.ConsumeBool()) {
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int32_t level = mFdp.ConsumeIntegralInRange<uint8_t>(
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License::KeyContainer::SW_SECURE_CRYPTO,
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License::KeyContainer::HW_SECURE_ALL);
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key->set_level((License_KeyContainer_SecurityLevel)level);
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}
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if (mFdp.ConsumeBool()) {
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policySetBool(std::bind(&License_Policy::set_can_persist, mLicense.mutable_policy(),
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std::placeholders::_1), &mFdp);
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}
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License::KeyContainer::OperatorSessionKeyPermissions *permissions =
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key->mutable_operator_session_key_permissions();
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policySetBool(
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std::bind(&License::KeyContainer::OperatorSessionKeyPermissions::
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set_allow_encrypt,
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permissions, std::placeholders::_1), &mFdp);
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policySetBool(
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std::bind(&License::KeyContainer::OperatorSessionKeyPermissions::
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set_allow_decrypt,
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permissions, std::placeholders::_1), &mFdp);
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policySetBool(std::bind(&License::KeyContainer::
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OperatorSessionKeyPermissions::set_allow_sign,
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permissions, std::placeholders::_1), &mFdp);
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policySetBool(
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std::bind(&License::KeyContainer::OperatorSessionKeyPermissions::
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set_allow_signature_verify,
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permissions, std::placeholders::_1), &mFdp);
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break;
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}
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case License::KeyContainer::ENTITLEMENT:
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default: {
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if (mFdp.ConsumeBool()) {
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mKeyId = mFdp.ConsumeBool() ? kEntitlementKeyId : mKeyId;
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key->set_id(mKeyId);
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}
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if (mFdp.ConsumeBool()) {
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int32_t level = mFdp.ConsumeIntegralInRange<uint8_t>(
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License::KeyContainer::SW_SECURE_CRYPTO,
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License::KeyContainer::HW_SECURE_ALL);
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key->set_level((License_KeyContainer_SecurityLevel)level);
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}
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License_Policy *policy = mLicense.mutable_policy();
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policySetBool(
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std::bind(&License_Policy::set_can_play, policy, std::placeholders::_1),
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&mFdp);
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policySetBool(std::bind(&License_Policy::set_can_persist, policy,
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std::placeholders::_1), &mFdp);
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policySetBool(std::bind(&License_Policy::set_can_renew, policy,
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std::placeholders::_1), &mFdp);
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policySetBool(std::bind(&License_Policy::set_renew_with_usage, policy,
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std::placeholders::_1), &mFdp);
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policySetBool(std::bind(&License_Policy::set_soft_enforce_rental_duration,
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policy, std::placeholders::_1), &mFdp);
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policySetBool(std::bind(&License_Policy::set_soft_enforce_playback_duration,
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policy, std::placeholders::_1), &mFdp);
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policySetInt64(std::bind(&License_Policy::set_rental_duration_seconds,
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policy, std::placeholders::_1), &mFdp);
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policySetInt64(std::bind(&License_Policy::set_playback_duration_seconds,
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policy, std::placeholders::_1), &mFdp);
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policySetInt64(std::bind(&License_Policy::set_license_duration_seconds,
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policy, std::placeholders::_1), &mFdp);
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policySetInt64(
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std::bind(&License_Policy::set_renewal_recovery_duration_seconds,
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policy, std::placeholders::_1), &mFdp);
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policySetInt64(
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std::bind(&License_Policy::set_renewal_retry_interval_seconds, policy,
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std::placeholders::_1), &mFdp);
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policySetInt64(
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std::bind(&License_Policy::set_renewal_delay_seconds, policy,
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std::placeholders::_1), &mFdp);
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if (mFdp.ConsumeBool()) {
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video_widevine::License::Policy::TimerDelayBase timeDelayBase = (video_widevine::License::Policy::TimerDelayBase)mFdp.ConsumeIntegralInRange<uint8_t>(
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License_Policy_TimerDelayBase_TIMER_DELAY_BASE_UNSPECIFIED ,
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License_Policy_TimerDelayBase_FIRST_DECRYPT);
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policy->set_initial_renewal_delay_base(timeDelayBase);
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}
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break;
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}
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}
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}
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void PolicyEngineFuzzer::process() {
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setUp();
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FuzzWvCdmEventListener fuzzWvCdmEventListener;
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CdmSessionId sessionId = mFdp.ConsumeRandomLengthString(kMaxByte);
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metrics::CryptoMetrics crypto_metrics;
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std::unique_ptr<CryptoSession> cryptoSession(
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wvcdm::CryptoSession::MakeCryptoSession(&crypto_metrics));
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std::unique_ptr<PolicyEngine> policyEngine(new PolicyEngine(
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sessionId, &fuzzWvCdmEventListener, cryptoSession.get()));
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while (mFdp.remaining_bytes()) {
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auto invokePolicyEngineAPI =
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mFdp.PickValueInArray<const std::function<void()>>({
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[&]() { policyEngine->CanDecryptContent(mKeyId); },
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[&]() { policyEngine->CanUseKeyForSecurityLevel(mKeyId); },
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[&]() { policyEngine->OnTimerEvent(); },
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[&]() {
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policyEngine->SetLicense(
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mLicense, mFdp.ConsumeBool() /*defer_license_state_update*/);
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},
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[&]() {
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int32_t maxEntitledKey =
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mFdp.ConsumeIntegralInRange<uint8_t>(1, kMaxEntitledKey);
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std::vector<WidevinePsshData_EntitledKey> entitled_keys(
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maxEntitledKey);
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for (int i = 0; i < maxEntitledKey; ++i) {
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entitled_keys[i].set_entitlement_key_id(
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mFdp.ConsumeRandomLengthString(kMaxByte));
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entitled_keys[i].set_key_id(
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mFdp.ConsumeBool()
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? mFdp.ConsumeRandomLengthString(kMaxByte)
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: mKeyId);
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}
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policyEngine->SetEntitledLicenseKeys(entitled_keys);
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},
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[&]() { policyEngine->SetLicenseForRelease(mLicense); },
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[&]() { policyEngine->BeginDecryption(); },
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[&]() { policyEngine->DecryptionEvent(); },
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[&]() {
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policyEngine->UpdateLicense(
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mLicense, mFdp.ConsumeBool() /*defer_license_state_update*/);
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},
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[&]() {
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policyEngine->UpdateLicenseState(
|
||||
mFdp.ConsumeIntegral<int64_t>() /*current_time*/);
|
||||
},
|
||||
[&]() {
|
||||
int32_t width = mFdp.ConsumeIntegralInRange<int32_t>(
|
||||
kMinResolution, kMaxResolution);
|
||||
int32_t height = mFdp.ConsumeIntegralInRange<int32_t>(
|
||||
kMinResolution, kMaxResolution);
|
||||
policyEngine->NotifyResolution(width, height);
|
||||
},
|
||||
[&]() { policyEngine->NotifySessionExpiration(); },
|
||||
[&]() {
|
||||
CdmQueryMap query_info;
|
||||
policyEngine->Query(&query_info);
|
||||
},
|
||||
[&]() {
|
||||
CdmKeyAllowedUsage key_usage;
|
||||
policyEngine->QueryKeyAllowedUsage(
|
||||
mKeyId, (mFdp.ConsumeBool() ? nullptr : &key_usage));
|
||||
},
|
||||
[&]() {
|
||||
policyEngine->RestorePlaybackTimes(
|
||||
mFdp.ConsumeIntegral<int64_t>() /*playback_start_time*/,
|
||||
mFdp.ConsumeIntegral<int64_t>() /*last_playback_time*/,
|
||||
mFdp.ConsumeIntegral<int64_t>() /*grace_period_end_time*/);
|
||||
},
|
||||
[&]() {
|
||||
policyEngine->HasLicenseOrRentalOrPlaybackDurationExpired(
|
||||
mFdp.ConsumeIntegral<int64_t>());
|
||||
},
|
||||
});
|
||||
invokePolicyEngineAPI();
|
||||
}
|
||||
}
|
||||
|
||||
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
|
||||
PolicyEngineFuzzer policyEngineFuzzer(data, size);
|
||||
policyEngineFuzzer.process();
|
||||
return 0;
|
||||
}
|
||||
Reference in New Issue
Block a user