ab70a5e358
This is the second code drop for the white-box api reference implementation and tests. This corrects the errors in the license white-box reference implementation and implements the remaining test cases. It should be noted that there is one test case missing, the test case for handling ChromeOS's unique policy settings. In order to make the tests easier to create and read, a license builder class was created and golden content and keys were wrapped in their own classes. How key errors are communicated was changed in the API. WB_RESULT_NO_SUCH_KEY and WB_RESULT_WRONG_KEY_TYPE were merged into WB_RESULT_KEY_UNAVAILABLE.
493 lines
22 KiB
C++
493 lines
22 KiB
C++
// Copyright 2020 Google LLC. All Rights Reserved.
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#include "api/license_whitebox.h"
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#include <memory>
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#include <string>
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#include <vector>
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#include "api/golden_data.h"
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#include "api/license_builder.h"
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#include "api/license_whitebox_test_base.h"
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#include "api/test_data.h"
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#include "crypto_utils/rsa_key.h"
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#include "testing/include/gtest/gtest.h"
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namespace widevine {
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class LicenseWhiteboxDecryptTest : public LicenseWhiteboxTestBase {
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protected:
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void SetUp() override {
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LicenseWhiteboxTestBase::SetUp();
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// Because we are using the same buffer for both CTR and CBC, need to make
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// sure that it is large enough for either one.
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plaintext_size_ = std::max(golden_data_.CBCContent().ciphertext.size(),
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golden_data_.CTRContent().ciphertext.size());
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plaintext_.resize(plaintext_size_);
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golden_data_.MakeKeyIdDifferent(&non_content_key_id_);
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golden_data_.MakeKeyIdDifferent(&missing_key_id_);
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}
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void LoadLicense(const std::vector<uint8_t>& padding) {
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LicenseBuilder builder;
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builder.AddContentKey(golden_data_.CBCCryptoKey().level,
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golden_data_.CBCCryptoKey().id,
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golden_data_.CBCCryptoKey().content->key);
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builder.AddContentKey(golden_data_.CTRCryptoKey().level,
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golden_data_.CTRCryptoKey().id,
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golden_data_.CTRCryptoKey().content->key);
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builder.AddContentKey(golden_data_.CBCDecodeKey().level,
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golden_data_.CBCDecodeKey().id,
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golden_data_.CBCDecodeKey().content->key);
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builder.AddContentKey(golden_data_.CBCHardwareKey().level,
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golden_data_.CBCHardwareKey().id,
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golden_data_.CBCHardwareKey().content->key);
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builder.AddOperatorSessionKey(non_content_key_id_);
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License license;
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builder.Build(*public_key_, &license);
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ASSERT_EQ(WB_License_ProcessLicenseResponse(
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whitebox_, license.message.data(), license.message.size(),
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license.signature.data(), license.signature.size(),
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license.session_key.data(), license.session_key.size(),
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license.request.data(), license.request.size()),
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WB_RESULT_OK);
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}
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// We need two special keys for this test, one that will be used for a
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// non-content key and one that will never be in the license.
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std::vector<uint8_t> non_content_key_id_ = {0, 0, 0};
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std::vector<uint8_t> missing_key_id_ = {1, 0, 0};
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// This is the buffer used to store the output of each decrypt call.
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size_t plaintext_size_;
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std::vector<uint8_t> plaintext_;
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};
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TEST_F(LicenseWhiteboxDecryptTest, CryptoKeyWithCbcDataInCbcMode) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC,
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golden_data_.CBCCryptoKey().id.data(),
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golden_data_.CBCCryptoKey().id.size(),
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golden_data_.CBCCryptoKey().content->ciphertext.data(),
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golden_data_.CBCCryptoKey().content->ciphertext.size(),
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golden_data_.CBCCryptoKey().content->iv.data(),
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golden_data_.CBCCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_OK);
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plaintext_.resize(plaintext_size_);
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ASSERT_EQ(plaintext_, golden_data_.CBCCryptoKey().content->plaintext);
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}
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TEST_F(LicenseWhiteboxDecryptTest, CryptoKeyWithCtrDataInCtrMode) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CTR,
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golden_data_.CTRCryptoKey().id.data(),
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golden_data_.CTRCryptoKey().id.size(),
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golden_data_.CTRCryptoKey().content->ciphertext.data(),
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golden_data_.CTRCryptoKey().content->ciphertext.size(),
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golden_data_.CTRCryptoKey().content->iv.data(),
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golden_data_.CTRCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_OK);
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plaintext_.resize(plaintext_size_);
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ASSERT_EQ(plaintext_, golden_data_.CTRCryptoKey().content->plaintext);
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}
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// We try to decrypt CBC encrypted data in CTR mode. All operations should be
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// successful, but the resulting plaintext should not match.
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TEST_F(LicenseWhiteboxDecryptTest, CryptoKeyWithCbcDataInCtrMode) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CTR,
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golden_data_.CBCCryptoKey().id.data(),
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golden_data_.CBCCryptoKey().id.size(),
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golden_data_.CBCCryptoKey().content->ciphertext.data(),
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golden_data_.CBCCryptoKey().content->ciphertext.size(),
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golden_data_.CBCCryptoKey().content->iv.data(),
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golden_data_.CBCCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_OK);
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plaintext_.resize(plaintext_size_);
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ASSERT_NE(plaintext_, golden_data_.CBCCryptoKey().content->plaintext);
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}
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// We try to decrypt CTR encrypted data in CBC mode. All operations should be
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// successful, but the resulting plaintext should not match.
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TEST_F(LicenseWhiteboxDecryptTest, CryptoKeyWithCtrDataInCbcMode) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC,
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golden_data_.CTRCryptoKey().id.data(),
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golden_data_.CTRCryptoKey().id.size(),
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golden_data_.CTRCryptoKey().content->ciphertext.data(),
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golden_data_.CTRCryptoKey().content->ciphertext.size(),
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golden_data_.CTRCryptoKey().content->iv.data(),
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golden_data_.CTRCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_OK);
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plaintext_.resize(plaintext_size_);
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ASSERT_NE(plaintext_, golden_data_.CTRCryptoKey().content->plaintext);
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}
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TEST_F(LicenseWhiteboxDecryptTest, CryptoKeyWithCbcDataAndPKCS8Padding) {
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LoadLicense(LicenseBuilder::PKSC8Padding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC,
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golden_data_.CBCCryptoKey().id.data(),
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golden_data_.CBCCryptoKey().id.size(),
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golden_data_.CBCCryptoKey().content->ciphertext.data(),
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golden_data_.CBCCryptoKey().content->ciphertext.size(),
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golden_data_.CBCCryptoKey().content->iv.data(),
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golden_data_.CBCCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_OK);
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plaintext_.resize(plaintext_size_);
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ASSERT_EQ(plaintext_, golden_data_.CBCCryptoKey().content->plaintext);
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}
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TEST_F(LicenseWhiteboxDecryptTest, CryptoKeyWithCtrDataAndPKCS8Padding) {
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LoadLicense(LicenseBuilder::PKSC8Padding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CTR,
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golden_data_.CTRCryptoKey().id.data(),
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golden_data_.CTRCryptoKey().id.size(),
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golden_data_.CTRCryptoKey().content->ciphertext.data(),
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golden_data_.CTRCryptoKey().content->ciphertext.size(),
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golden_data_.CTRCryptoKey().content->iv.data(),
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golden_data_.CTRCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_OK);
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plaintext_.resize(plaintext_size_);
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ASSERT_EQ(plaintext_, golden_data_.CTRCryptoKey().content->plaintext);
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}
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// Try decrypting two different sets of content to make sure that two
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// different keys can be used at the same time.
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TEST_F(LicenseWhiteboxDecryptTest, SuccessWithMultipleKeys) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC,
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golden_data_.CBCCryptoKey().id.data(),
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golden_data_.CBCCryptoKey().id.size(),
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golden_data_.CBCCryptoKey().content->ciphertext.data(),
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golden_data_.CBCCryptoKey().content->ciphertext.size(),
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golden_data_.CBCCryptoKey().content->iv.data(),
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golden_data_.CBCCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_OK);
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plaintext_.resize(plaintext_size_);
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ASSERT_EQ(plaintext_, golden_data_.CBCCryptoKey().content->plaintext);
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// Reset our output buffer.
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plaintext_.clear();
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plaintext_size_ = golden_data_.CTRDecodeKey().content->plaintext.size();
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plaintext_.resize(plaintext_size_);
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CTR,
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golden_data_.CTRCryptoKey().id.data(),
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golden_data_.CTRCryptoKey().id.size(),
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golden_data_.CTRCryptoKey().content->ciphertext.data(),
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golden_data_.CTRCryptoKey().content->ciphertext.size(),
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golden_data_.CTRCryptoKey().content->iv.data(),
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golden_data_.CTRCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_OK);
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plaintext_.resize(plaintext_size_);
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ASSERT_EQ(plaintext_, golden_data_.CTRCryptoKey().content->plaintext);
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}
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TEST_F(LicenseWhiteboxDecryptTest, InvalidParameterForNullWhitebox) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(nullptr, WB_CIPHER_MODE_CBC,
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golden_data_.CBCCryptoKey().id.data(),
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golden_data_.CBCCryptoKey().id.size(),
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golden_data_.CBCCryptoKey().content->ciphertext.data(),
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golden_data_.CBCCryptoKey().content->ciphertext.size(),
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golden_data_.CBCCryptoKey().content->iv.data(),
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golden_data_.CBCCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_INVALID_PARAMETER);
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}
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TEST_F(LicenseWhiteboxDecryptTest, InvalidParameterForInvalidCipherMode) {
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LoadLicense(LicenseBuilder::NoPadding());
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// In order to trick the compiler into letting us pass an invalid enum value
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// to WB__License_Decrypt(), we need to cast it. If we don't do this, the
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// compiler tries to save us.
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const WB_CipherMode invalid_mode = static_cast<WB_CipherMode>(0xFF);
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ASSERT_EQ(WB_License_Decrypt(
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whitebox_, invalid_mode, golden_data_.CBCCryptoKey().id.data(),
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golden_data_.CBCCryptoKey().id.size(),
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golden_data_.CBCCryptoKey().content->ciphertext.data(),
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golden_data_.CBCCryptoKey().content->ciphertext.size(),
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golden_data_.CBCCryptoKey().content->iv.data(),
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golden_data_.CBCCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_INVALID_PARAMETER);
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}
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TEST_F(LicenseWhiteboxDecryptTest, InvalidParameterForNullKeyId) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC, nullptr,
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golden_data_.CBCCryptoKey().id.size(),
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golden_data_.CBCCryptoKey().content->ciphertext.data(),
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golden_data_.CBCCryptoKey().content->ciphertext.size(),
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golden_data_.CBCCryptoKey().content->iv.data(),
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golden_data_.CBCCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_INVALID_PARAMETER);
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}
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TEST_F(LicenseWhiteboxDecryptTest, InvalidParameterForZeroKeyIdSize) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC,
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golden_data_.CBCCryptoKey().id.data(), 0,
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golden_data_.CBCCryptoKey().content->ciphertext.data(),
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golden_data_.CBCCryptoKey().content->ciphertext.size(),
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golden_data_.CBCCryptoKey().content->iv.data(),
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golden_data_.CBCCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_INVALID_PARAMETER);
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}
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TEST_F(LicenseWhiteboxDecryptTest, InvalidParameterForNullInputData) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC,
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golden_data_.CBCCryptoKey().id.data(),
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golden_data_.CBCCryptoKey().id.size(), nullptr,
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golden_data_.CBCCryptoKey().content->ciphertext.size(),
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golden_data_.CBCCryptoKey().content->iv.data(),
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golden_data_.CBCCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_INVALID_PARAMETER);
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}
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// AES CBC requires that the input be block aligned (multiple of 16). CTR does
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// not care.
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TEST_F(LicenseWhiteboxDecryptTest, InvalidParameterForInvalidCBCInputDataSize) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC,
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golden_data_.CBCCryptoKey().id.data(),
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golden_data_.CBCCryptoKey().id.size(),
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golden_data_.CBCCryptoKey().content->ciphertext.data(),
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14, golden_data_.CBCCryptoKey().content->iv.data(),
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golden_data_.CBCCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_INVALID_PARAMETER);
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}
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// The white-box (using any cipher mode) should reject input with size zero.
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TEST_F(LicenseWhiteboxDecryptTest, InvalidParameterForZeroInputDataSize) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC,
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golden_data_.CBCCryptoKey().id.data(),
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golden_data_.CBCCryptoKey().id.size(),
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golden_data_.CBCCryptoKey().content->ciphertext.data(),
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0, golden_data_.CBCCryptoKey().content->iv.data(),
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golden_data_.CBCCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_INVALID_PARAMETER);
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}
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TEST_F(LicenseWhiteboxDecryptTest, InvalidParameterForNullIV) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(
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whitebox_, WB_CIPHER_MODE_CBC, golden_data_.CBCCryptoKey().id.data(),
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golden_data_.CBCCryptoKey().id.size(),
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golden_data_.CBCCryptoKey().content->ciphertext.data(),
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golden_data_.CBCCryptoKey().content->ciphertext.size(), nullptr,
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golden_data_.CBCCryptoKey().content->iv.size(), plaintext_.data(),
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&plaintext_size_),
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WB_RESULT_INVALID_PARAMETER);
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}
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// IV size should be 16. Any number other than 16 should fail.
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TEST_F(LicenseWhiteboxDecryptTest, InvalidParameterForInvalidIVSize) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC,
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golden_data_.CBCCryptoKey().id.data(),
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golden_data_.CBCCryptoKey().id.size(),
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golden_data_.CBCCryptoKey().content->ciphertext.data(),
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golden_data_.CBCCryptoKey().content->ciphertext.size(),
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golden_data_.CBCCryptoKey().content->iv.data(), 9,
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_INVALID_PARAMETER);
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}
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TEST_F(LicenseWhiteboxDecryptTest, InvalidParameterForNullOutput) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC,
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golden_data_.CBCCryptoKey().id.data(),
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golden_data_.CBCCryptoKey().id.size(),
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golden_data_.CBCCryptoKey().content->ciphertext.data(),
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golden_data_.CBCCryptoKey().content->ciphertext.size(),
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golden_data_.CBCCryptoKey().content->iv.data(),
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golden_data_.CBCCryptoKey().content->iv.size(),
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nullptr, &plaintext_size_),
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WB_RESULT_INVALID_PARAMETER);
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}
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TEST_F(LicenseWhiteboxDecryptTest, InvalidParameterForNullOutputSize) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC,
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golden_data_.CBCCryptoKey().id.data(),
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golden_data_.CBCCryptoKey().id.size(),
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golden_data_.CBCCryptoKey().content->ciphertext.data(),
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golden_data_.CBCCryptoKey().content->ciphertext.size(),
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golden_data_.CBCCryptoKey().content->iv.data(),
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golden_data_.CBCCryptoKey().content->iv.size(),
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plaintext_.data(), nullptr),
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WB_RESULT_INVALID_PARAMETER);
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}
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// For this test, "missing key id" specifically means a key id that was never
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// in the license to start with. This is different than "non content key"
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// and "dropped content key", as those keys were in the license but ignored.
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TEST_F(LicenseWhiteboxDecryptTest, KeyUnavailableForMissingKeyId) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC, missing_key_id_.data(),
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missing_key_id_.size(),
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golden_data_.CBCCryptoKey().content->ciphertext.data(),
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golden_data_.CBCCryptoKey().content->ciphertext.size(),
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golden_data_.CBCCryptoKey().content->iv.data(),
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golden_data_.CBCCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_KEY_UNAVAILABLE);
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}
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TEST_F(LicenseWhiteboxDecryptTest, KeyUnavailableForNonContentKey) {
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LoadLicense(LicenseBuilder::NoPadding());
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ASSERT_EQ(
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WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC,
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non_content_key_id_.data(), non_content_key_id_.size(),
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golden_data_.CBCCryptoKey().content->ciphertext.data(),
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golden_data_.CBCCryptoKey().content->ciphertext.size(),
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golden_data_.CBCCryptoKey().content->iv.data(),
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golden_data_.CBCCryptoKey().content->iv.size(),
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plaintext_.data(), &plaintext_size_),
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WB_RESULT_KEY_UNAVAILABLE);
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}
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// Under normal circumstances, a hardware key should be dropped. The exception
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// to this rule is on ChromeOS with a special license.
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TEST_F(LicenseWhiteboxDecryptTest,
|
|
InsufficientSecurityLevelForHardwareContentKey) {
|
|
LoadLicense(LicenseBuilder::NoPadding());
|
|
|
|
ASSERT_EQ(WB_License_Decrypt(
|
|
whitebox_, WB_CIPHER_MODE_CBC,
|
|
golden_data_.CBCHardwareKey().id.data(),
|
|
golden_data_.CBCHardwareKey().id.size(),
|
|
golden_data_.CBCHardwareKey().content->ciphertext.data(),
|
|
golden_data_.CBCHardwareKey().content->ciphertext.size(),
|
|
golden_data_.CBCHardwareKey().content->iv.data(),
|
|
golden_data_.CBCHardwareKey().content->iv.size(),
|
|
plaintext_.data(), &plaintext_size_),
|
|
WB_RESULT_INSUFFICIENT_SECURITY_LEVEL);
|
|
}
|
|
|
|
TEST_F(LicenseWhiteboxDecryptTest, InsufficientSecurityLevelForDecodeKey) {
|
|
LoadLicense(LicenseBuilder::NoPadding());
|
|
|
|
// Use the software decode key as they are limited to
|
|
// WB_License_Decrypt().
|
|
ASSERT_EQ(
|
|
WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC,
|
|
golden_data_.CBCDecodeKey().id.data(),
|
|
golden_data_.CBCDecodeKey().id.size(),
|
|
golden_data_.CBCDecodeKey().content->ciphertext.data(),
|
|
golden_data_.CBCDecodeKey().content->ciphertext.size(),
|
|
golden_data_.CBCDecodeKey().content->iv.data(),
|
|
golden_data_.CBCDecodeKey().content->iv.size(),
|
|
plaintext_.data(), &plaintext_size_),
|
|
WB_RESULT_INSUFFICIENT_SECURITY_LEVEL);
|
|
}
|
|
|
|
TEST_F(LicenseWhiteboxDecryptTest, BufferTooSmall) {
|
|
LoadLicense(LicenseBuilder::NoPadding());
|
|
|
|
// Our ciphertext will be large enough that we should not need to worry about
|
|
// using a constant here.
|
|
plaintext_size_ = 8;
|
|
|
|
ASSERT_EQ(
|
|
WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC,
|
|
golden_data_.CBCCryptoKey().id.data(),
|
|
golden_data_.CBCCryptoKey().id.size(),
|
|
golden_data_.CBCCryptoKey().content->ciphertext.data(),
|
|
golden_data_.CBCCryptoKey().content->ciphertext.size(),
|
|
golden_data_.CBCCryptoKey().content->iv.data(),
|
|
golden_data_.CBCCryptoKey().content->iv.size(),
|
|
plaintext_.data(), &plaintext_size_),
|
|
WB_RESULT_BUFFER_TOO_SMALL);
|
|
|
|
// We don't use padding so the reported plaintext size should be the same as
|
|
// the cipher text size.
|
|
ASSERT_EQ(plaintext_size_,
|
|
golden_data_.CBCCryptoKey().content->ciphertext.size());
|
|
}
|
|
|
|
TEST_F(LicenseWhiteboxDecryptTest, InvalidState) {
|
|
// Unlike the other tests, we do not call LoadLicense() as the criteria for
|
|
// WB_RESULT_INVALID_STATE is that no key can be found and keys are provided
|
|
// via a license.
|
|
|
|
ASSERT_EQ(
|
|
WB_License_Decrypt(whitebox_, WB_CIPHER_MODE_CBC,
|
|
golden_data_.CBCCryptoKey().id.data(),
|
|
golden_data_.CBCCryptoKey().id.size(),
|
|
golden_data_.CBCCryptoKey().content->ciphertext.data(),
|
|
golden_data_.CBCCryptoKey().content->ciphertext.size(),
|
|
golden_data_.CBCCryptoKey().content->iv.data(),
|
|
golden_data_.CBCCryptoKey().content->iv.size(),
|
|
plaintext_.data(), &plaintext_size_),
|
|
WB_RESULT_INVALID_STATE);
|
|
}
|
|
|
|
} // namespace widevine
|