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/*
* Copyright (C) 2019 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 DEBUG true // STOPSHIP if true
#include "Log.h"
#include "ProtoEncryption.h"
#include <android/util/protobuf.h>
#include "IncidentKeyStore.h"
namespace android {
namespace os {
namespace incidentd {
using android::util::FIELD_COUNT_REPEATED;
using android::util::FIELD_TYPE_STRING;
using android::util::ProtoOutputStream;
using android::util::ProtoReader;
using std::string;
static const int FIELD_ID_BLOCK = 1;
size_t ProtoEncryptor::encrypt() {
string block;
int i = 0;
// Read at most sBlockSize at a time and encrypt.
while (mReader->readBuffer() != NULL) {
size_t readBytes =
mReader->currentToRead() > sBlockSize ? sBlockSize : mReader->currentToRead();
block.resize(readBytes);
std::memcpy(block.data(), mReader->readBuffer(), readBytes);
string encrypted;
if (IncidentKeyStore::getInstance().encrypt(block, 0, &encrypted)) {
mOutputStream.write(FIELD_TYPE_STRING | FIELD_ID_BLOCK | FIELD_COUNT_REPEATED,
encrypted);
VLOG("Block %d Encryption: original %lld now %lld", i++, (long long)readBytes,
(long long)encrypted.length());
mReader->move(readBytes);
} else {
return 0;
}
}
return mOutputStream.size();
}
status_t ProtoEncryptor::flush(int fd) {
if (!mOutputStream.flush(fd)) {
return BAD_VALUE;
}
return NO_ERROR;
}
status_t ProtoDecryptor::readOneBlock(string* output) {
if (!mReader->hasNext()) {
return NO_ERROR;
}
uint64_t fieldTag = mReader->readRawVarint();
uint32_t fieldId = read_field_id(fieldTag);
uint8_t wireType = read_wire_type(fieldTag);
if (wireType == WIRE_TYPE_LENGTH_DELIMITED) {
// Read this section from the reader into an FdBuffer
size_t sectionSize = mReader->readRawVarint();
output->resize(sectionSize);
size_t pos = 0;
while (pos < sectionSize && mReader->readBuffer() != NULL) {
size_t toRead = (sectionSize - pos) > mReader->currentToRead()
? mReader->currentToRead()
: (sectionSize - pos);
std::memcpy(&((output->data())[pos]), mReader->readBuffer(), toRead);
pos += toRead;
mReader->move(toRead);
}
if (pos != sectionSize) {
return BAD_VALUE;
ALOGE("Failed to read one block");
}
} else {
return BAD_VALUE;
}
return NO_ERROR;
}
status_t ProtoDecryptor::decryptAndFlush(FdBuffer* out) {
size_t mStartBytes = mReader->bytesRead();
size_t bytesRead = 0;
int i = 0;
status_t err = NO_ERROR;
// Let's read until we read mTotalSize. If any error occurs before that, make sure to move the
// read pointer so the caller can continue to read the following sections.
while (bytesRead < mTotalSize) {
string block;
err = readOneBlock(&block);
bytesRead = mReader->bytesRead() - mStartBytes;
if (err != NO_ERROR) {
break;
}
if (block.length() == 0) {
VLOG("Done reading all blocks");
break;
}
string decryptedBlock;
if ((IncidentKeyStore::getInstance()).decrypt(block, &decryptedBlock)) {
VLOG("Block %d Original Size %lu Decrypted size %lu", i++,
(unsigned long)block.length(), (unsigned long)decryptedBlock.length());
out->write(reinterpret_cast<uint8_t*>(decryptedBlock.data()), decryptedBlock.length());
} else {
err = BAD_VALUE;
break;
}
}
if (bytesRead < mTotalSize) {
mReader->move(mTotalSize - bytesRead);
}
return err;
}
} // namespace incidentd
} // namespace os
} // namespace android
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