1 files changed, 268 insertions, 0 deletions
diff --git a/security/sharedsecret/aidl/vts/functional/SharedSecretAidlTest.cpp b/security/sharedsecret/aidl/vts/functional/SharedSecretAidlTest.cpp
new file mode 100644
index 0000000000..83f6ef39db
--- /dev/null
+++ b/security/sharedsecret/aidl/vts/functional/SharedSecretAidlTest.cpp
@@ -0,0 +1,268 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+#define LOG_TAG "sharedsecret_test"
+#include <android-base/logging.h>
+
+#include <aidl/Vintf.h>
+#include <aidl/android/hardware/security/keymint/ErrorCode.h>
+#include <aidl/android/hardware/security/sharedsecret/ISharedSecret.h>
+#include <android/binder_manager.h>
+#include <gtest/gtest.h>
+#include <vector>
+
+namespace aidl::android::hardware::security::sharedsecret::test {
+using ::aidl::android::hardware::security::keymint::ErrorCode;
+using ::std::shared_ptr;
+using ::std::vector;
+using Status = ::ndk::ScopedAStatus;
+
+class SharedSecretAidlTest : public ::testing::Test {
+  public:
+    struct GetParamsResult {
+        ErrorCode error;
+        SharedSecretParameters params;
+        auto tie() { return std::tie(error, params); }
+    };
+
+    struct ComputeResult {
+        ErrorCode error;
+        vector<uint8_t> sharing_check;
+        auto tie() { return std::tie(error, sharing_check); }
+    };
+
+    GetParamsResult getSharedSecretParameters(shared_ptr<ISharedSecret>& sharedSecret) {
+        SharedSecretParameters params;
+        auto error = GetReturnErrorCode(sharedSecret->getSharedSecretParameters(&params));
+        EXPECT_EQ(ErrorCode::OK, error);
+        GetParamsResult result;
+        result.tie() = std::tie(error, params);
+        return result;
+    }
+
+    vector<SharedSecretParameters> getAllSharedSecretParameters() {
+        vector<SharedSecretParameters> paramsVec;
+        for (auto& sharedSecret : allSharedSecrets_) {
+            auto result = getSharedSecretParameters(sharedSecret);
+            EXPECT_EQ(ErrorCode::OK, result.error);
+            if (result.error == ErrorCode::OK) paramsVec.push_back(std::move(result.params));
+        }
+        return paramsVec;
+    }
+
+    ComputeResult computeSharedSecret(shared_ptr<ISharedSecret>& sharedSecret,
+                                      const vector<SharedSecretParameters>& params) {
+        std::vector<uint8_t> sharingCheck;
+        auto error = GetReturnErrorCode(sharedSecret->computeSharedSecret(params, &sharingCheck));
+        ComputeResult result;
+        result.tie() = std::tie(error, sharingCheck);
+        return result;
+    }
+
+    vector<ComputeResult> computeAllSharedSecrets(const vector<SharedSecretParameters>& params) {
+        vector<ComputeResult> result;
+        for (auto& sharedSecret : allSharedSecrets_) {
+            result.push_back(computeSharedSecret(sharedSecret, params));
+        }
+        return result;
+    }
+
+    vector<vector<uint8_t>> copyNonces(const vector<SharedSecretParameters>& paramsVec) {
+        vector<vector<uint8_t>> nonces;
+        for (auto& param : paramsVec) {
+            nonces.push_back(param.nonce);
+        }
+        return nonces;
+    }
+
+    void verifyResponses(const vector<uint8_t>& expected, const vector<ComputeResult>& responses) {
+        for (auto& response : responses) {
+            EXPECT_EQ(ErrorCode::OK, response.error);
+            EXPECT_EQ(expected, response.sharing_check) << "Sharing check values should match.";
+        }
+    }
+
+    ErrorCode GetReturnErrorCode(const Status& result) {
+        if (result.isOk()) return ErrorCode::OK;
+        if (result.getExceptionCode() == EX_SERVICE_SPECIFIC) {
+            return static_cast<ErrorCode>(result.getServiceSpecificError());
+        }
+        return ErrorCode::UNKNOWN_ERROR;
+    }
+
+    static shared_ptr<ISharedSecret> getSharedSecretService(const char* name) {
+        if (AServiceManager_isDeclared(name)) {
+            ::ndk::SpAIBinder binder(AServiceManager_waitForService(name));
+            return ISharedSecret::fromBinder(binder);
+        }
+        return nullptr;
+    }
+
+    const vector<shared_ptr<ISharedSecret>>& allSharedSecrets() { return allSharedSecrets_; }
+
+    static void SetUpTestCase() {
+        if (allSharedSecrets_.empty()) {
+            auto names = ::android::getAidlHalInstanceNames(ISharedSecret::descriptor);
+            for (const auto& name : names) {
+                auto servicePtr = getSharedSecretService(name.c_str());
+                if (servicePtr != nullptr) allSharedSecrets_.push_back(std::move(servicePtr));
+            }
+        }
+    }
+    static void TearDownTestCase() {}
+    void SetUp() override {}
+    void TearDown() override {}
+
+  private:
+    static vector<shared_ptr<ISharedSecret>> allSharedSecrets_;
+};
+
+vector<shared_ptr<ISharedSecret>> SharedSecretAidlTest::allSharedSecrets_;
+
+TEST_F(SharedSecretAidlTest, GetParameters) {
+    auto sharedSecrets = allSharedSecrets();
+    for (auto sharedSecret : sharedSecrets) {
+        auto result1 = getSharedSecretParameters(sharedSecret);
+        EXPECT_EQ(ErrorCode::OK, result1.error);
+        auto result2 = getSharedSecretParameters(sharedSecret);
+        EXPECT_EQ(ErrorCode::OK, result2.error);
+        ASSERT_EQ(result1.params.seed, result2.params.seed)
+                << "A given shared secret service should always return the same seed.";
+        ASSERT_EQ(result1.params.nonce, result2.params.nonce)
+                << "A given shared secret service should always return the same nonce until "
+                   "restart.";
+    }
+}
+
+TEST_F(SharedSecretAidlTest, ComputeSharedSecret) {
+    auto params = getAllSharedSecretParameters();
+    ASSERT_EQ(allSharedSecrets().size(), params.size())
+            << "One or more shared secret services failed to provide parameters.";
+    auto nonces = copyNonces(params);
+    EXPECT_EQ(allSharedSecrets().size(), nonces.size());
+    std::sort(nonces.begin(), nonces.end());
+    std::unique(nonces.begin(), nonces.end());
+    EXPECT_EQ(allSharedSecrets().size(), nonces.size());
+
+    auto responses = computeAllSharedSecrets(params);
+    ASSERT_GT(responses.size(), 0U);
+    verifyResponses(responses[0].sharing_check, responses);
+
+    // Do it a second time.  Should get the same answers.
+    params = getAllSharedSecretParameters();
+    ASSERT_EQ(allSharedSecrets().size(), params.size())
+            << "One or more shared secret services failed to provide parameters.";
+
+    responses = computeAllSharedSecrets(params);
+    ASSERT_GT(responses.size(), 0U);
+    ASSERT_EQ(32U, responses[0].sharing_check.size());
+    verifyResponses(responses[0].sharing_check, responses);
+}
+
+template <class F>
+class final_action {
+  public:
+    explicit final_action(F f) : f_(std::move(f)) {}
+    ~final_action() { f_(); }
+
+  private:
+    F f_;
+};
+
+template <class F>
+inline final_action<F> finally(const F& f) {
+    return final_action<F>(f);
+}
+
+TEST_F(SharedSecretAidlTest, ComputeSharedSecretCorruptNonce) {
+    auto fixup_hmac = finally([&]() { computeAllSharedSecrets(getAllSharedSecretParameters()); });
+
+    auto params = getAllSharedSecretParameters();
+    ASSERT_EQ(allSharedSecrets().size(), params.size())
+            << "One or more shared secret services failed to provide parameters.";
+
+    // All should be well in the normal case
+    auto responses = computeAllSharedSecrets(params);
+
+    ASSERT_GT(responses.size(), 0U);
+    vector<uint8_t> correct_response = responses[0].sharing_check;
+    verifyResponses(correct_response, responses);
+
+    // Pick a random param, a random byte within the param's nonce, and a random bit within
+    // the byte.  Flip that bit.
+    size_t param_to_tweak = rand() % params.size();
+    uint8_t byte_to_tweak = rand() % sizeof(params[param_to_tweak].nonce);
+    uint8_t bit_to_tweak = rand() % 8;
+    params[param_to_tweak].nonce[byte_to_tweak] ^= (1 << bit_to_tweak);
+
+    responses = computeAllSharedSecrets(params);
+    for (size_t i = 0; i < responses.size(); ++i) {
+        if (i == param_to_tweak) {
+            EXPECT_EQ(ErrorCode::INVALID_ARGUMENT, responses[i].error)
+                    << "Shared secret service that provided tweaked param should fail to compute "
+                       "shared secret";
+        } else {
+            EXPECT_EQ(ErrorCode::OK, responses[i].error) << "Others should succeed";
+            EXPECT_NE(correct_response, responses[i].sharing_check)
+                    << "Others should calculate a different shared secret, due to the tweaked "
+                       "nonce.";
+        }
+    }
+}
+
+TEST_F(SharedSecretAidlTest, ComputeSharedSecretCorruptSeed) {
+    auto fixup_hmac = finally([&]() { computeAllSharedSecrets(getAllSharedSecretParameters()); });
+    auto params = getAllSharedSecretParameters();
+    ASSERT_EQ(allSharedSecrets().size(), params.size())
+            << "One or more shared secret service failed to provide parameters.";
+
+    // All should be well in the normal case
+    auto responses = computeAllSharedSecrets(params);
+
+    ASSERT_GT(responses.size(), 0U);
+    vector<uint8_t> correct_response = responses[0].sharing_check;
+    verifyResponses(correct_response, responses);
+
+    // Pick a random param and modify the seed.  We just increase the seed length by 1.  It doesn't
+    // matter what value is in the additional byte; it changes the seed regardless.
+    auto param_to_tweak = rand() % params.size();
+    auto& to_tweak = params[param_to_tweak].seed;
+    ASSERT_TRUE(to_tweak.size() == 32 || to_tweak.size() == 0);
+    if (!to_tweak.size()) {
+        to_tweak.resize(32);  // Contents don't matter; a little randomization is nice.
+    }
+    to_tweak[0]++;
+
+    responses = computeAllSharedSecrets(params);
+    for (size_t i = 0; i < responses.size(); ++i) {
+        if (i == param_to_tweak) {
+            EXPECT_EQ(ErrorCode::INVALID_ARGUMENT, responses[i].error)
+                    << "Shared secret service that provided tweaked param should fail to compute "
+                       "shared secret";
+        } else {
+            EXPECT_EQ(ErrorCode::OK, responses[i].error) << "Others should succeed";
+            EXPECT_NE(correct_response, responses[i].sharing_check)
+                    << "Others should calculate a different shared secret, due to the tweaked "
+                       "nonce.";
+        }
+    }
+}
+}  // namespace aidl::android::hardware::security::sharedsecret::test
+
+int main(int argc, char** argv) {
+    ::testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}