Kyle Zhang | de0a90b | 2023-06-15 00:16:42 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2023 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #define LOG_TAG "DrmRemotelyProvisionedComponent" |
| 18 | #include "DrmRemotelyProvisionedComponent.h" |
Robert Shih | 1195d77 | 2023-07-10 11:54:57 -0700 | [diff] [blame] | 19 | |
| 20 | #include <android-base/properties.h> |
| 21 | #include <cppbor.h> |
| 22 | #include <cppbor_parse.h> |
Kyle Zhang | de0a90b | 2023-06-15 00:16:42 +0000 | [diff] [blame] | 23 | #include <log/log.h> |
Robert Shih | 1195d77 | 2023-07-10 11:54:57 -0700 | [diff] [blame] | 24 | #include <map> |
| 25 | #include <string> |
Kyle Zhang | de0a90b | 2023-06-15 00:16:42 +0000 | [diff] [blame] | 26 | |
| 27 | namespace android::mediadrm { |
| 28 | DrmRemotelyProvisionedComponent::DrmRemotelyProvisionedComponent(std::shared_ptr<IDrmPlugin> drm, |
| 29 | std::string drmVendor, |
Robert Shih | 569e825 | 2023-07-12 12:50:41 -0700 | [diff] [blame^] | 30 | std::string drmDesc, |
| 31 | std::vector<uint8_t> bcc) |
| 32 | : mDrm(std::move(drm)), |
| 33 | mDrmVendor(std::move(drmVendor)), |
| 34 | mDrmDesc(std::move(drmDesc)), |
| 35 | mBcc(std::move(bcc)) {} |
| 36 | |
Kyle Zhang | de0a90b | 2023-06-15 00:16:42 +0000 | [diff] [blame] | 37 | ScopedAStatus DrmRemotelyProvisionedComponent::getHardwareInfo(RpcHardwareInfo* info) { |
| 38 | info->versionNumber = 3; |
| 39 | info->rpcAuthorName = mDrmVendor; |
| 40 | info->supportedEekCurve = RpcHardwareInfo::CURVE_NONE; |
| 41 | info->supportedNumKeysInCsr = RpcHardwareInfo::MIN_SUPPORTED_NUM_KEYS_IN_CSR; |
| 42 | info->uniqueId = mDrmDesc; |
| 43 | return ScopedAStatus::ok(); |
| 44 | } |
| 45 | |
| 46 | ScopedAStatus DrmRemotelyProvisionedComponent::generateEcdsaP256KeyPair(bool, MacedPublicKey*, |
| 47 | std::vector<uint8_t>*) { |
| 48 | return ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage( |
| 49 | IRemotelyProvisionedComponent::STATUS_REMOVED, |
| 50 | "generateEcdsaP256KeyPair not supported.")); |
| 51 | } |
| 52 | |
| 53 | ScopedAStatus DrmRemotelyProvisionedComponent::generateCertificateRequest( |
| 54 | bool, const std::vector<MacedPublicKey>&, const std::vector<uint8_t>&, |
| 55 | const std::vector<uint8_t>&, DeviceInfo*, ProtectedData*, std::vector<uint8_t>*) { |
| 56 | return ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage( |
| 57 | IRemotelyProvisionedComponent::STATUS_REMOVED, |
| 58 | "generateCertificateRequest not supported.")); |
| 59 | } |
| 60 | |
Robert Shih | 1195d77 | 2023-07-10 11:54:57 -0700 | [diff] [blame] | 61 | ScopedAStatus DrmRemotelyProvisionedComponent::getVerifiedDeviceInfo(cppbor::Map& deviceInfoMap) { |
| 62 | std::vector<uint8_t> verifiedDeviceInfo; |
| 63 | auto status = mDrm->getPropertyByteArray("verifiedDeviceInfo", &verifiedDeviceInfo); |
| 64 | if (!status.isOk()) { |
| 65 | ALOGE("getPropertyByteArray verifiedDeviceInfo failed. Details: [%s].", |
| 66 | status.getDescription().c_str()); |
| 67 | return status; |
| 68 | } |
| 69 | |
| 70 | auto [parsed, _, err] = cppbor::parse( |
| 71 | reinterpret_cast<const uint8_t*>(verifiedDeviceInfo.data()), verifiedDeviceInfo.size()); |
| 72 | |
| 73 | if (!parsed || !parsed->asMap()) { |
| 74 | ALOGE("Failed to parse the verified device info cbor: %s", err.c_str()); |
| 75 | return ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage( |
| 76 | IRemotelyProvisionedComponent::STATUS_FAILED, |
| 77 | "Failed to parse the verified device info cbor.")); |
| 78 | } |
| 79 | |
| 80 | const cppbor::Map* verifiedDeviceInfoMap = parsed->asMap(); |
| 81 | for (size_t i = 0; i < verifiedDeviceInfoMap->size(); i++) { |
| 82 | auto& [keyItem, valueItem] = (*verifiedDeviceInfoMap)[i]; |
| 83 | ALOGI("Found device info %s", keyItem->asTstr()->value().data()); |
| 84 | if (valueItem != nullptr && valueItem->asTstr() != nullptr && |
| 85 | valueItem->asTstr()->value().empty()) { |
| 86 | ALOGI("Value is empty. Skip"); |
| 87 | continue; |
| 88 | } |
| 89 | deviceInfoMap.add(keyItem->clone(), valueItem->clone()); |
| 90 | } |
| 91 | |
| 92 | return ScopedAStatus::ok(); |
| 93 | } |
| 94 | |
| 95 | ScopedAStatus DrmRemotelyProvisionedComponent::getDeviceInfo(std::vector<uint8_t>* deviceInfo) { |
| 96 | auto deviceInfoMap = cppbor::Map(); |
| 97 | auto status = getVerifiedDeviceInfo(deviceInfoMap); |
| 98 | if (!status.isOk()) { |
| 99 | ALOGE("getVerifiedDeviceInfo failed. Details: [%s].", status.getDescription().c_str()); |
| 100 | return status; |
| 101 | } |
| 102 | const std::map<std::string, std::string> keyToProp{{"brand", "ro.product.brand"}, |
| 103 | {"manufacturer", "ro.product.manufacturer"}, |
| 104 | {"model", "ro.product.model"}, |
| 105 | {"device", "ro.product.device"}, |
| 106 | {"product", "ro.product.name"}}; |
| 107 | for (auto i : keyToProp) { |
| 108 | auto key = i.first; |
| 109 | auto prop = i.second; |
| 110 | const auto& val= deviceInfoMap.get(key); |
| 111 | if (val == nullptr || val->asTstr()->value().empty()) { |
| 112 | std::string propValue = android::base::GetProperty(prop, ""); |
| 113 | if (propValue.empty()) { |
| 114 | ALOGE("Failed to get OS property %s", prop.c_str()); |
| 115 | return ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage( |
| 116 | IRemotelyProvisionedComponent::STATUS_FAILED, |
| 117 | "Failed to get OS property.")); |
| 118 | } |
| 119 | deviceInfoMap.add(cppbor::Tstr(key), cppbor::Tstr(propValue)); |
| 120 | ALOGI("use OS property %s: %s", prop.c_str(), propValue.c_str()); |
| 121 | } else { |
| 122 | ALOGI("use verified key %s: %s", key.c_str(), val->asTstr()->value().data()); |
| 123 | } |
| 124 | } |
| 125 | deviceInfoMap.canonicalize(); |
| 126 | *deviceInfo = deviceInfoMap.encode(); |
| 127 | return ScopedAStatus::ok(); |
| 128 | } |
| 129 | |
Kyle Zhang | de0a90b | 2023-06-15 00:16:42 +0000 | [diff] [blame] | 130 | ScopedAStatus DrmRemotelyProvisionedComponent::generateCertificateRequestV2( |
| 131 | const std::vector<MacedPublicKey>&, const std::vector<uint8_t>& challenge, |
Robert Shih | 1195d77 | 2023-07-10 11:54:57 -0700 | [diff] [blame] | 132 | std::vector<uint8_t>* out) { |
| 133 | // access csr input/output via setPropertyByteArray/getPropertyByteArray |
Kyle Zhang | de0a90b | 2023-06-15 00:16:42 +0000 | [diff] [blame] | 134 | auto status = mDrm->setPropertyByteArray("certificateSigningRequestChallenge", challenge); |
| 135 | if (!status.isOk()) { |
| 136 | ALOGE("setPropertyByteArray certificateSigningRequestChallenge failed. Details: [%s].", |
| 137 | status.getDescription().c_str()); |
| 138 | return status; |
| 139 | } |
| 140 | |
Robert Shih | 1195d77 | 2023-07-10 11:54:57 -0700 | [diff] [blame] | 141 | std::vector<uint8_t> deviceInfo; |
| 142 | status = getDeviceInfo(&deviceInfo); |
| 143 | if (!status.isOk()) { |
| 144 | ALOGE("getDeviceInfo failed. Details: [%s].", status.getDescription().c_str()); |
| 145 | return status; |
| 146 | } |
| 147 | |
| 148 | status = mDrm->setPropertyByteArray("deviceInfo", deviceInfo); |
| 149 | if (!status.isOk()) { |
| 150 | ALOGE("setPropertyByteArray deviceInfo failed. Details: [%s].", |
| 151 | status.getDescription().c_str()); |
| 152 | return status; |
| 153 | } |
| 154 | |
| 155 | std::vector<uint8_t> deviceSignedCsrPayload; |
| 156 | status = mDrm->getPropertyByteArray("deviceSignedCsrPayload", &deviceSignedCsrPayload); |
| 157 | if (!status.isOk()) { |
| 158 | ALOGE("getPropertyByteArray deviceSignedCsrPayload failed. Details: [%s].", |
| 159 | status.getDescription().c_str()); |
| 160 | return status; |
| 161 | } |
| 162 | |
| 163 | // assemble AuthenticatedRequest (definition in IRemotelyProvisionedComponent.aidl) |
| 164 | *out = cppbor::Array() |
| 165 | .add(1 /* version */) |
| 166 | .add(cppbor::Map() /* UdsCerts */) |
Robert Shih | 569e825 | 2023-07-12 12:50:41 -0700 | [diff] [blame^] | 167 | .add(cppbor::EncodedItem(mBcc)) |
Robert Shih | 1195d77 | 2023-07-10 11:54:57 -0700 | [diff] [blame] | 168 | .add(cppbor::EncodedItem(std::move(deviceSignedCsrPayload))) |
| 169 | .encode(); |
Kyle Zhang | de0a90b | 2023-06-15 00:16:42 +0000 | [diff] [blame] | 170 | return ScopedAStatus::ok(); |
| 171 | } |
| 172 | } // namespace android::mediadrm |