android/libwvdrmengine/oemcrypto/test/oec_device_features.cpp

// Copyright 2018 Google LLC. All Rights Reserved. This file and proprietary
// source code may only be used and distributed under the Widevine
// License Agreement.
//
// OEMCrypto device features for unit tests
//
#include "oec_device_features.h"

#include <stdio.h>

#include <cstring>

#include "oec_test_data.h"
#include "test_sleep.h"

namespace wvoec {

DeviceFeatures global_features;

void DeviceFeatures::Initialize() {
  if (initialized_) return;
  uses_keybox = false;
  loads_certificate = false;
  generic_crypto = false;
  usage_table = false;
  supports_rsa_3072 = false;
  supports_secp256r1 = false;
  api_version = 0;
  derive_key_method = NO_METHOD;
  OEMCrypto_SetSandbox(kTestSandbox, sizeof(kTestSandbox));
  const OEMCryptoResult init_status = OEMCrypto_Initialize();
  if (OEMCrypto_SUCCESS != init_status) {
    printf("OEMCrypto_Initialize failed %d. All tests will fail.\n",
           init_status);
    return;
  }
  const OEMCryptoResult api_status = OEMCrypto_SetMaxAPIVersion(kCurrentAPI);
  if (api_status != OEMCrypto_SUCCESS &&
      api_status != OEMCrypto_ERROR_NOT_IMPLEMENTED) {
    // Log error, but continue assuming no error.
    printf("OEMCrypto_SetMaxAPIVersion returned %d\n", api_status);
  }
  const OEMCryptoResult test_mode_status = OEMCrypto_EnterTestMode();
  if (OEMCrypto_SUCCESS != test_mode_status) {
    printf("OEMCrypto_EnterTestMode returned %d. Tests might fail.\n",
           test_mode_status);
  };
  uint8_t buffer[1];
  uint8_t iv[16] = {};
  size_t size = 0;
  provisioning_method = OEMCrypto_GetProvisioningMethod();
  printf("provisioning_method = %s\n",
         ProvisioningMethodName(provisioning_method));
  uses_keybox =
      (OEMCrypto_ERROR_NOT_IMPLEMENTED != OEMCrypto_GetKeyData(buffer, &size));
  printf("uses_keybox = %s.\n", uses_keybox ? "true" : "false");
  OEMCrypto_SESSION session;
  OEMCryptoResult result = OEMCrypto_OpenSession(&session);
  if (result != OEMCrypto_SUCCESS) {
    printf("--- ERROR: Could not open session: %d ----\n", result);
  }
  // If the device uses a keybox, check to see if loading a certificate is
  // installed.
  if (provisioning_method == OEMCrypto_Keybox ||
      provisioning_method == OEMCrypto_OEMCertificate ||
      provisioning_method == OEMCrypto_BootCertificateChain) {
    // Devices with a keybox or OEM Certificate are required to support loading
    // a DRM certificate.
    loads_certificate = true;
  } else {
    // Other devices are either broken, or they have a baked in certificate.
    loads_certificate = false;
  }
  printf("loads_certificate = %s.\n", loads_certificate ? "true" : "false");
  generic_crypto =
      (OEMCrypto_ERROR_NOT_IMPLEMENTED !=
       OEMCrypto_Generic_Encrypt(buffer, 0, buffer, 0, iv,
                                 OEMCrypto_AES_CBC_128_NO_PADDING, buffer));
  printf("generic_crypto = %s.\n", generic_crypto ? "true" : "false");
  supports_cas =
      (OEMCrypto_ERROR_NOT_IMPLEMENTED !=
       OEMCrypto_LoadCasECMKeys(session, nullptr, 0, nullptr, nullptr));
  printf("supports_cas = %s.\n", supports_cas ? "true" : "false");
  OEMCrypto_CloseSession(session);
  api_version = OEMCrypto_APIVersion();
  printf("api_version = %u.\n", api_version);
  if (api_version < kCoreMessagesAPI) {
    printf("--------- WARNING: minimum API is %d ----------\n", api_version);
    printf("--------- Expect most tests will fail. --------\n");
  }
  // These unit tests only work with new usage tables. We do not test v12
  // usage tables.
  usage_table = OEMCrypto_SupportsUsageTable();
  printf("usage_table = %s.\n", usage_table ? "true" : "false");
  PickDerivedKey();
  const uint32_t supported_cert = OEMCrypto_SupportedCertificates();
  if (supported_cert & OEMCrypto_Supports_RSA_CAST) {
    cast_receiver = true;
  }
  if (supported_cert & OEMCrypto_Supports_RSA_3072bit) {
    supports_rsa_3072 = true;
  }
  if (supported_cert & OEMCrypto_Supports_ECC_secp256r1) {
    supports_secp256r1 = true;
  }
  printf("cast_receiver = %s.\n", cast_receiver ? "true" : "false");
  printf("supports_rsa_3072 = %s.\n", supports_rsa_3072 ? "true" : "false");
  printf("supports_secp256r1 = %s.\n", supports_secp256r1 ? "true" : "false");
  resource_rating = OEMCrypto_ResourceRatingTier();
  printf("resource_rating = %u, security level %u.\n", resource_rating,
         static_cast<unsigned int>(OEMCrypto_SecurityLevel()));
  uint32_t decrypt_hash_type = OEMCrypto_SupportsDecryptHash();
  supports_crc = (decrypt_hash_type == OEMCrypto_CRC_Clear_Buffer);
  if (supports_crc) {
    printf("Decrypt hashes will be tested.\n");
  } else {
    printf("Decrypt hashes will not be tested -- %s.\n",
           decrypt_hash_type == OEMCrypto_Hash_Not_Supported
               ? "not supported"
               : "partner defined hash");
  }
  switch (derive_key_method) {
    case NO_METHOD:
      printf("NO_METHOD: Cannot derive known session keys.\n");
      uses_keybox = false;
      loads_certificate = false;
      generic_crypto = false;
      usage_table = false;
      break;
    case LOAD_TEST_KEYBOX:
      printf("LOAD_TEST_KEYBOX: Call LoadTestKeybox before deriving keys.\n");
      break;
    case LOAD_TEST_RSA_KEY:
      printf("LOAD_TEST_RSA_KEY: Call LoadTestRSAKey before deriving keys.\n");
      break;
    case TEST_PROVISION_30:
      printf("TEST_PROVISION_30: Device provisioned with OEM Cert.\n");
      break;
    case TEST_PROVISION_40:
      printf("TEST_PROVISION_40: Device has boot certificate chain.\n");
      break;
  }
  OEMCrypto_Security_Level security_level = OEMCrypto_SecurityLevel();
  supports_level_1 = (security_level == OEMCrypto_Level1);
  printf("SecurityLevel is %s (L%u)\n",
         supports_level_1 ? "Level 1" : "Not Level 1",
         static_cast<unsigned int>(security_level));
  CheckSecureBuffers();
  OEMCrypto_Terminate();
  initialized_ = true;
}

std::string DeviceFeatures::RestrictFilter(const std::string& initial_filter) {
  std::string filter = initial_filter;
  // clang-format off
  if (!uses_keybox)                   FilterOut(&filter, "*KeyboxTest*");
  // TODO(b/197141970): Need to revisit OEMCryptoLoadsCert* tests for
  // provisioning 4. Disabled here temporarily.
  if (!loads_certificate ||
      provisioning_method == OEMCrypto_BootCertificateChain)
                                      FilterOut(&filter, "OEMCryptoLoadsCert*");
  if (!generic_crypto)                FilterOut(&filter, "*GenericCrypto*");
  if (derive_key_method == NO_METHOD) FilterOut(&filter, "*SessionTest*");
  if (!supports_rsa_3072)             FilterOut(&filter, "*RSAKey3072*");
  if (api_version < 17)               FilterOut(&filter, "*API17*");
  if (api_version < 18)               FilterOut(&filter, "*API18*");
  // clang-format on
  // Some tests may require root access. If user is not root, filter these tests
  // out.
  if (!wvutil::TestSleep::CanChangeSystemTime()) {
    printf("Filtering out TimeRollbackPrevention.\n");
    FilterOut(&filter, "*TimeRollbackPrevention*");
  } else {
    printf("Can change time. I will run TimeRollbackPrevention.\n");
  }
  // Performance tests take a long time.  Filter them out if they are not
  // specifically requested.
  if (filter.find("Performance") == std::string::npos) {
    FilterOut(&filter, "*Performance*");
  }
  return filter;
}

void DeviceFeatures::PickDerivedKey() {
  switch (provisioning_method) {
    case OEMCrypto_OEMCertificate:
      derive_key_method = TEST_PROVISION_30;
      return;
    case OEMCrypto_DrmCertificate:
      if (OEMCrypto_ERROR_NOT_IMPLEMENTED != OEMCrypto_LoadTestRSAKey()) {
        derive_key_method = LOAD_TEST_RSA_KEY;
      }
      return;
    case OEMCrypto_Keybox:
      if (OEMCrypto_ERROR_NOT_IMPLEMENTED !=
          OEMCrypto_LoadTestKeybox(nullptr, 0)) {
        derive_key_method = LOAD_TEST_KEYBOX;
      }
      return;
    case OEMCrypto_BootCertificateChain:
      derive_key_method = TEST_PROVISION_40;
      return;
    case OEMCrypto_ProvisioningError:
      printf(
          "ERROR: OEMCrypto_GetProvisioningMethod() returns "
          "OEMCrypto_ProvisioningError\n");
      if (OEMCrypto_ERROR_NOT_IMPLEMENTED != OEMCrypto_LoadTestRSAKey()) {
        derive_key_method = LOAD_TEST_RSA_KEY;
      }
      return;
  }
}

void DeviceFeatures::CheckSecureBuffers() {
  output_types_.push_back({false, OEMCrypto_BufferType_Clear});
  output_types_.push_back({true, OEMCrypto_BufferType_Clear});
  test_secure_buffers = false;
  OEMCrypto_SESSION session;
  OEMCryptoResult result = OEMCrypto_OpenSession(&session);
  if (result != OEMCrypto_SUCCESS) {
    printf("--- ERROR: Could not open session: %d ----\n", result);
    return;
  }
  OEMCrypto_DestBufferDesc output_descriptor;
  output_descriptor.type = OEMCrypto_BufferType_Secure;
  int secure_fd;
  result = OEMCrypto_AllocateSecureBuffer(session, 42, &output_descriptor,
                                          &secure_fd);
  if (result == OEMCrypto_ERROR_NOT_IMPLEMENTED) {
    printf("Secure buffers will not be tested\n");
    return;
  }
  if (result != OEMCrypto_SUCCESS) {
    printf("--- ERROR: Could not create secure buffer: %d ----\n", result);
    return;
  }
  result = OEMCrypto_FreeSecureBuffer(session, &output_descriptor, secure_fd);
  if (result != OEMCrypto_SUCCESS) {
    printf("--- ERROR: Could not free secure buffer: %d ----\n", result);
    return;
  }
  printf("Secure buffers will be tested\n");
  output_types_.push_back({false, OEMCrypto_BufferType_Secure});
  test_secure_buffers = true;
}

void DeviceFeatures::FilterOut(std::string* current_filter,
                               const std::string& new_filter) {
  if (current_filter->find('-') == std::string::npos) {
    *current_filter += "-" + new_filter;
  } else {
    *current_filter += ":" + new_filter;
  }
}

// Return the list of output types for the decrypt tests.
const std::vector<OutputType>& DeviceFeatures::GetOutputTypes() {
  if (!initialized_) {
    Initialize();
  }
  return output_types_;
}

const char* ProvisioningMethodName(OEMCrypto_ProvisioningMethod method) {
  switch (method) {
    case OEMCrypto_ProvisioningError:
      return "OEMCrypto_ProvisioningError";
    case OEMCrypto_DrmCertificate:
      return "OEMCrypto_DrmCertificate";
    case OEMCrypto_Keybox:
      return "OEMCrypto_Keybox";
    case OEMCrypto_OEMCertificate:
      return "OEMCrypto_OEMCertificate";
    case OEMCrypto_BootCertificateChain:
      return "OEMCrypto_BootCertificateChain";
  }
  // Not reachable
  return "";
}

}  // namespace wvoec