diff --git a/libwvdrmengine/build_and_run_all_unit_tests.sh b/libwvdrmengine/build_and_run_all_unit_tests.sh index ec4273f1..a2ea2fc4 100755 --- a/libwvdrmengine/build_and_run_all_unit_tests.sh +++ b/libwvdrmengine/build_and_run_all_unit_tests.sh @@ -81,6 +81,7 @@ try_adb_push cdm_engine_test try_adb_push cdm_feature_test try_adb_push cdm_extended_duration_test try_adb_push cdm_session_unittest +try_adb_push crypto_session_unittest try_adb_push device_files_unittest try_adb_push distribution_test try_adb_push event_metric_test diff --git a/libwvdrmengine/cdm/core/include/crypto_session.h b/libwvdrmengine/cdm/core/include/crypto_session.h index 2e0fb056..42bf7e37 100644 --- a/libwvdrmengine/cdm/core/include/crypto_session.h +++ b/libwvdrmengine/cdm/core/include/crypto_session.h @@ -169,11 +169,15 @@ class CryptoSession { const std::string& provider_session_token); private: + friend class CryptoSessionForTest; + bool GetProvisioningMethod(CdmClientTokenType* token_type); void Init(); void Terminate(); bool GetTokenFromKeybox(std::string* token); bool GetTokenFromOemCert(std::string* token); + static bool ExtractSystemIdFromOemCert(const std::string& oem_cert, + uint32_t* system_id); void GenerateMacContext(const std::string& input_context, std::string* deriv_context); void GenerateEncryptContext(const std::string& input_context, diff --git a/libwvdrmengine/cdm/core/src/crypto_session.cpp b/libwvdrmengine/cdm/core/src/crypto_session.cpp index 927e0bed..50af8f54 100644 --- a/libwvdrmengine/cdm/core/src/crypto_session.cpp +++ b/libwvdrmengine/cdm/core/src/crypto_session.cpp @@ -7,12 +7,15 @@ #include // needed for ntoh() #include -#include #include +#include +#include #include "crypto_key.h" #include "log.h" +#include "openssl/asn1.h" #include "openssl/sha.h" +#include "openssl/x509v3.h" #include "properties.h" #include "pst_report.h" #include "string_conversions.h" @@ -33,6 +36,15 @@ const uint32_t kRsaSignatureLength = 256; const size_t kMaximumChunkSize = 100 * 1024; // 100 KiB const size_t kEstimatedInitialUsageTableHeader = 40; const size_t kOemCryptoApiVersionSupportsBigUsageTables = 13; + +// Constants and utility objects relating to OEM Certificates +const int kExtensionOidSize = 64; +const char* const kWidevineSystemIdExtensionOid = "1.3.6.1.4.1.11129.4.1.1"; +struct X509StackDeleter { + void operator()(STACK_OF(X509)* stack) { + sk_X509_pop_free(stack, X509_free); + } +}; } namespace wvcdm { @@ -355,42 +367,153 @@ bool CryptoSession::GetApiVersion(uint32_t* version) { bool CryptoSession::GetSystemId(uint32_t* system_id) { if (!system_id) { - LOGE("CryptoSession::GetSystemId : No buffer passed to method."); + LOGE("CryptoSession::GetSystemId: No buffer passed to method."); return false; } - uint8_t buf[KEYBOX_KEY_DATA_SIZE]; - size_t buf_size = sizeof(buf); - LOGV("CryptoSession::GetSystemId: Lock"); AutoLock auto_lock(crypto_lock_); if (!initialized_) { return false; } - OEMCryptoResult sts; - M_TIME( - sts = OEMCrypto_GetKeyData( - buf, - &buf_size, - requested_security_level_), - metrics_, - oemcrypto_get_key_data_, - sts, - metrics::Pow2Bucket(buf_size), - requested_security_level_); - if (OEMCrypto_SUCCESS != sts) { + if (pre_provision_token_type_ == kClientTokenKeybox) { + uint8_t buf[KEYBOX_KEY_DATA_SIZE]; + size_t buf_size = sizeof(buf); + + OEMCryptoResult sts; + M_TIME( + sts = OEMCrypto_GetKeyData( + buf, + &buf_size, + requested_security_level_), + metrics_, + oemcrypto_get_key_data_, + sts, + metrics::Pow2Bucket(buf_size), + requested_security_level_); + + if (OEMCrypto_SUCCESS != sts) { + LOGE("CryptoSession::GetSystemId: OEMCrypto_GetKeyData failed with %d", + sts); + return false; + } + + // Decode 32-bit int encoded as network-byte-order byte array starting at + // index 4. + uint32_t* id = reinterpret_cast(&buf[4]); + + *system_id = ntohl(*id); + return true; + } else if (pre_provision_token_type_ == kClientTokenOemCert) { + // Get the OEM Cert + std::string oem_cert; + if (GetTokenFromOemCert(&oem_cert)) { + return ExtractSystemIdFromOemCert(oem_cert, system_id); + } else { + return false; + } + } else { + LOGE("CryptoSession::GetSystemId: Unsupported pre-provision token type %d", + pre_provision_token_type_); + return false; + } +} + +bool CryptoSession::ExtractSystemIdFromOemCert(const std::string& oem_cert, + uint32_t* system_id) { + // Parse the OEM Cert chain into an OpenSSL X509 Stack + const std::unique_ptr + x509_stack(sk_X509_new_null()); + if (!x509_stack) { + LOGE("CryptoSession::GetSystemId: Unable to allocate X509 Stack."); return false; } - // Decode 32-bit int encoded as network-byte-order byte array starting at - // index 4. - uint32_t* id = reinterpret_cast(&buf[4]); + CBS pkcs7; + CBS_init(&pkcs7, reinterpret_cast(oem_cert.data()), + oem_cert.size()); + if (!PKCS7_get_certificates(x509_stack.get(), &pkcs7)) { + LOGE("CryptoSession::GetSystemId: Error getting certificate chain."); + return false; + } - *system_id = ntohl(*id); - return true; + // Get the Widevine intermediate cert from the stack + if (sk_X509_num(x509_stack.get()) != 2) { + LOGE("CryptoSession::GetSystemId: Expected 2 certificates in chain, got %d", + sk_X509_num(x509_stack.get())); + return false; + } + + X509* const intermediate_cert = sk_X509_value(x509_stack.get(), 1); + if (!intermediate_cert) { + LOGE("CryptoSession::GetSystemId: Unable to get intermediate cert."); + return false; + } + + // Find the Widevine System ID extension in the intermediate cert + const int extension_count = X509_get_ext_count(intermediate_cert); + for (int i = 0; i < extension_count; ++i) { + X509_EXTENSION* const extension = X509_get_ext(intermediate_cert, i); + if (!extension) { + LOGE("CryptoSession::GetSystemId: Unable to get cert extension %d", i); + continue; + } + + ASN1_OBJECT* const extension_object = X509_EXTENSION_get_object(extension); + if (!extension_object) { + LOGE("CryptoSession::GetSystemId: Unable to get object of cert " + "extension %d", i); + continue; + } + + char extension_name[kExtensionOidSize + 1]; + OBJ_obj2txt(extension_name, kExtensionOidSize, extension_object, 1); + if (strcmp(extension_name, kWidevineSystemIdExtensionOid) != 0) { + // This extension is not the Widevine System ID, so we should move on to + // the next one. + continue; + } + + ASN1_OCTET_STRING* const octet_str = X509_EXTENSION_get_data(extension); + if (!octet_str) { + LOGE("CryptoSession::GetSystemId: Unable to get data of Widevine System " + "ID extension."); + return false; + } + + const unsigned char* data = octet_str->data; + if (!data) { + LOGE("CryptoSession::GetSystemId: Null data in Widevine System ID " + "extension."); + return false; + } + + ASN1_INTEGER* const asn1_integer = + d2i_ASN1_INTEGER(NULL, &data, octet_str->length); + if (!asn1_integer) { + LOGE("CryptoSession::GetSystemId: Unable to decode data in Widevine " + "System ID extension."); + return false; + } + + const long system_id_long = ASN1_INTEGER_get(asn1_integer); + ASN1_INTEGER_free(asn1_integer); + if (system_id_long == -1) { + LOGE("CryptoSession::GetSystemId: Unable to decode ASN integer in " + "Widevine System ID extension."); + return false; + } + + *system_id = static_cast(system_id_long); + return true; + } + + LOGE("CryptoSession::GetSystemId: Widevine System ID extension not found."); + return false; } + bool CryptoSession::GetProvisioningId(std::string* provisioning_id) { if (!provisioning_id) { LOGE("CryptoSession::GetProvisioningId : No buffer passed to method."); diff --git a/libwvdrmengine/cdm/core/test/crypto_session_unittest.cpp b/libwvdrmengine/cdm/core/test/crypto_session_unittest.cpp new file mode 100644 index 00000000..271d2046 --- /dev/null +++ b/libwvdrmengine/cdm/core/test/crypto_session_unittest.cpp @@ -0,0 +1,248 @@ +// Copyright 2017 Google Inc. All Rights Reserved. + +#include + +#include + +#include "crypto_session.h" +#include "scoped_ptr.h" + +namespace { + +const uint8_t kOemCert[] = { + 0x30, 0x82, 0x09, 0xf7, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, + 0x01, 0x07, 0x02, 0xa0, 0x82, 0x09, 0xe8, 0x30, 0x82, 0x09, 0xe4, 0x02, + 0x01, 0x01, 0x31, 0x00, 0x30, 0x0f, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, + 0xf7, 0x0d, 0x01, 0x07, 0x01, 0xa0, 0x02, 0x04, 0x00, 0xa0, 0x82, 0x09, + 0xc8, 0x30, 0x82, 0x04, 0x1a, 0x30, 0x82, 0x03, 0x02, 0xa0, 0x03, 0x02, + 0x01, 0x02, 0x02, 0x11, 0x00, 0xf2, 0xa1, 0x08, 0xdf, 0x12, 0x84, 0xb9, + 0x73, 0x6c, 0x23, 0x73, 0xe1, 0x1f, 0xf3, 0xac, 0x7a, 0x30, 0x0d, 0x06, + 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x0b, 0x05, 0x00, + 0x30, 0x81, 0x8b, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06, + 0x13, 0x02, 0x55, 0x53, 0x31, 0x13, 0x30, 0x11, 0x06, 0x03, 0x55, 0x04, + 0x08, 0x0c, 0x0a, 0x57, 0x61, 0x73, 0x68, 0x69, 0x6e, 0x67, 0x74, 0x6f, + 0x6e, 0x31, 0x11, 0x30, 0x0f, 0x06, 0x03, 0x55, 0x04, 0x07, 0x0c, 0x08, + 0x4b, 0x69, 0x72, 0x6b, 0x6c, 0x61, 0x6e, 0x64, 0x31, 0x0f, 0x30, 0x0d, + 0x06, 0x03, 0x55, 0x04, 0x0a, 0x0c, 0x06, 0x47, 0x6f, 0x6f, 0x67, 0x6c, + 0x65, 0x31, 0x11, 0x30, 0x0f, 0x06, 0x03, 0x55, 0x04, 0x0b, 0x0c, 0x08, + 0x57, 0x69, 0x64, 0x65, 0x76, 0x69, 0x6e, 0x65, 0x31, 0x30, 0x30, 0x2e, + 0x06, 0x03, 0x55, 0x04, 0x03, 0x0c, 0x27, 0x47, 0x6f, 0x6f, 0x67, 0x6c, + 0x65, 0x20, 0x4f, 0x45, 0x4d, 0x20, 0x54, 0x65, 0x73, 0x74, 0x20, 0x44, + 0x65, 0x76, 0x69, 0x63, 0x65, 0x3b, 0x20, 0x73, 0x79, 0x73, 0x74, 0x65, + 0x6d, 0x20, 0x69, 0x64, 0x3a, 0x20, 0x37, 0x33, 0x34, 0x36, 0x30, 0x1e, + 0x17, 0x0d, 0x31, 0x37, 0x30, 0x33, 0x31, 0x33, 0x30, 0x30, 0x30, 0x30, + 0x30, 0x30, 0x5a, 0x17, 0x0d, 0x31, 0x39, 0x31, 0x32, 0x30, 0x38, 0x30, + 0x30, 0x30, 0x30, 0x30, 0x30, 0x5a, 0x30, 0x6d, 0x31, 0x12, 0x30, 0x10, + 0x06, 0x03, 0x55, 0x04, 0x03, 0x0c, 0x09, 0x37, 0x33, 0x34, 0x36, 0x2d, + 0x6c, 0x65, 0x61, 0x66, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, + 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0x89, 0xca, 0x95, 0x6e, 0xb5, 0xb8, + 0x8e, 0xc8, 0x2d, 0x18, 0x2f, 0x52, 0x2a, 0xde, 0xac, 0x56, 0x8d, 0x8c, + 0x67, 0x14, 0xf6, 0xb9, 0xf1, 0x65, 0xd3, 0x22, 0x43, 0xa3, 0x98, 0x42, + 0x20, 0x43, 0x4c, 0xdf, 0xf2, 0xeb, 0x31, 0x8c, 0x0e, 0x53, 0x5b, 0x99, + 0x82, 0xc3, 0x48, 0x04, 0x53, 0xad, 0x96, 0xb6, 0x9f, 0x52, 0xcc, 0x01, + 0xc8, 0xb3, 0x87, 0x6b, 0x9e, 0xea, 0xa9, 0xeb, 0xda, 0xac, 0xf9, 0x6f, + 0xde, 0xa1, 0x44, 0x32, 0x52, 0x49, 0x47, 0xff, 0x65, 0x79, 0x1e, 0xc5, + 0x73, 0x17, 0xb3, 0x36, 0xfc, 0x45, 0xca, 0x90, 0x37, 0x59, 0x1e, 0x16, + 0xab, 0x09, 0x69, 0xcf, 0xda, 0x56, 0x51, 0xfd, 0xeb, 0xcf, 0xcb, 0x8f, + 0xb1, 0xc3, 0x45, 0x2b, 0x7c, 0x0a, 0xa5, 0x9c, 0x0d, 0x2c, 0xad, 0x1c, + 0xd3, 0x33, 0xdd, 0xfe, 0x93, 0x69, 0xa2, 0x4b, 0x4b, 0xcf, 0x1d, 0x20, + 0x98, 0x4a, 0x4f, 0x5b, 0xe9, 0x24, 0xca, 0xfa, 0x18, 0x11, 0x81, 0x8b, + 0x7a, 0xb4, 0x5a, 0xc8, 0xdf, 0x6f, 0x5f, 0x21, 0x07, 0x31, 0x00 +}; + +const uint32_t kOemCertSystemId = 7346; + +} // namespace + +namespace wvcdm { + +class CryptoSessionForTest: public CryptoSession { + public: + using CryptoSession::ExtractSystemIdFromOemCert; +}; + +TEST(CryptoSessionTest, CanExtractSystemIdFromOemCertificate) { + std::string oem_cert(reinterpret_cast(kOemCert), + sizeof(kOemCert)); + uint32_t system_id; + ASSERT_TRUE(CryptoSessionForTest::ExtractSystemIdFromOemCert(oem_cert, + &system_id)); + ASSERT_EQ(kOemCertSystemId, system_id); +} + +} // namespace wvcdm diff --git a/libwvdrmengine/cdm/test/Android.mk b/libwvdrmengine/cdm/test/Android.mk index d27b48b7..3d536776 100644 --- a/libwvdrmengine/cdm/test/Android.mk +++ b/libwvdrmengine/cdm/test/Android.mk @@ -27,6 +27,10 @@ test_name := cdm_session_unittest test_src_dir := ../core/test include $(LOCAL_PATH)/unit-test.mk +test_name := crypto_session_unittest +test_src_dir := ../core/test +include $(LOCAL_PATH)/unit-test.mk + test_name := device_files_unittest test_src_dir := ../core/test include $(LOCAL_PATH)/unit-test.mk diff --git a/libwvdrmengine/run_all_unit_tests.sh b/libwvdrmengine/run_all_unit_tests.sh index 13a2ae2a..e084adb1 100755 --- a/libwvdrmengine/run_all_unit_tests.sh +++ b/libwvdrmengine/run_all_unit_tests.sh @@ -83,6 +83,7 @@ adb_shell_run base64_test adb_shell_run buffer_reader_test adb_shell_run cdm_engine_test adb_shell_run cdm_session_unittest +adb_shell_run crypto_session_unittest adb_shell_run device_files_unittest adb_shell_run distribution_test adb_shell_run event_metric_test diff --git a/tests/Android.mk b/tests/Android.mk index 34440715..1a78d99d 100644 --- a/tests/Android.mk +++ b/tests/Android.mk @@ -12,6 +12,7 @@ WIDEVINE_TEST_MAKE_TARGETS := \ cdm_engine_test \ cdm_extended_duration_test \ cdm_session_unittest \ + crypto_session_unittest \ device_files_unittest \ distribution_test \ event_metric_test \