| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| #ifndef LIB_READER_DATATRANFER_IMPL_H_ |
| #define LIB_READER_DATATRANFER_IMPL_H_ |
| |
| #include "common/continuation/continuation.h" |
| #include "common/continuation/asio.h" |
| #include "common/continuation/protobuf.h" |
| #include "common/sasl_authenticator.h" |
| |
| #include <boost/asio/read.hpp> |
| #include <boost/asio/buffer.hpp> |
| |
| #include <boost/asio/read.hpp> |
| #include <boost/asio/buffer.hpp> |
| |
| namespace hdfs { |
| |
| namespace DataTransferSaslStreamUtil { |
| Status |
| ConvertToStatus(const ::hadoop::hdfs::DataTransferEncryptorMessageProto *msg, |
| std::string *payload); |
| void PrepareInitialHandshake( |
| ::hadoop::hdfs::DataTransferEncryptorMessageProto *msg); |
| } |
| |
| template <class Stream> |
| struct DataTransferSaslStream<Stream>::Authenticator |
| : continuation::Continuation { |
| Authenticator(DigestMD5Authenticator *authenticator, |
| const std::string *request, |
| hadoop::hdfs::DataTransferEncryptorMessageProto *msg) |
| : authenticator_(authenticator), request_(request), msg_(msg) {} |
| |
| virtual void Run(const Next &next) override { |
| using namespace ::hadoop::hdfs; |
| std::string response; |
| Status status = authenticator_->EvaluateResponse(*request_, &response); |
| msg_->Clear(); |
| if (status.ok()) { |
| // TODO: Handle encryption scheme |
| msg_->set_payload(response); |
| msg_->set_status( |
| DataTransferEncryptorMessageProto_DataTransferEncryptorStatus_SUCCESS); |
| } else { |
| msg_->set_status( |
| DataTransferEncryptorMessageProto_DataTransferEncryptorStatus_ERROR); |
| } |
| next(Status::OK()); |
| } |
| |
| private: |
| DigestMD5Authenticator *authenticator_; |
| const std::string *request_; |
| hadoop::hdfs::DataTransferEncryptorMessageProto *msg_; |
| }; |
| |
| template <class Stream> |
| struct DataTransferSaslStream<Stream>::ReadSaslMessage |
| : continuation::Continuation { |
| ReadSaslMessage(std::shared_ptr<Stream> stream, std::string *data) |
| : stream_(stream), data_(data), read_pb_(stream, &resp_) {} |
| |
| virtual void Run(const Next &next) override { |
| auto handler = [this, next](const Status &status) { |
| if (status.ok()) { |
| Status new_stat = |
| DataTransferSaslStreamUtil::ConvertToStatus(&resp_, data_); |
| next(new_stat); |
| } else { |
| next(status); |
| } |
| }; |
| read_pb_.Run(handler); |
| } |
| |
| private: |
| std::shared_ptr<Stream> stream_; |
| std::string *data_; |
| hadoop::hdfs::DataTransferEncryptorMessageProto resp_; |
| continuation::ReadDelimitedPBMessageContinuation<Stream, 1024> read_pb_; |
| }; |
| |
| template <class Stream> |
| template <class Handler> |
| void DataTransferSaslStream<Stream>::Handshake(const Handler &next) { |
| using ::hadoop::hdfs::DataTransferEncryptorMessageProto; |
| using ::hdfs::asio_continuation::Write; |
| using ::hdfs::continuation::WriteDelimitedPBMessage; |
| |
| static const int kMagicNumber = htonl(kDataTransferSasl); |
| static const boost::asio::const_buffers_1 kMagicNumberBuffer = boost::asio::buffer( |
| reinterpret_cast<const char *>(kMagicNumber), sizeof(kMagicNumber)); |
| |
| struct State { |
| DataTransferEncryptorMessageProto req0; |
| std::string resp0; |
| DataTransferEncryptorMessageProto req1; |
| std::string resp1; |
| std::shared_ptr<Stream> stream; |
| }; |
| auto m = continuation::Pipeline<State>::Create(); |
| State *s = &m->state(); |
| s->stream = stream_; |
| |
| DataTransferSaslStreamUtil::PrepareInitialHandshake(&s->req0); |
| |
| m->Push(Write(stream_, kMagicNumberBuffer)) |
| .Push(WriteDelimitedPBMessage(stream_, &s->req0)) |
| .Push(new ReadSaslMessage(stream_, &s->resp0)) |
| .Push(new Authenticator(&authenticator_, &s->resp0, &s->req1)) |
| .Push(WriteDelimitedPBMessage(stream_, &s->req1)) |
| .Push(new ReadSaslMessage(stream_, &s->resp1)); |
| m->Run([next](const Status &status, const State &) { next(status); }); |
| } |
| |
| template <class Stream> |
| void DataTransferSaslStream<Stream>::Cancel() { |
| /* implement with secured reads */ |
| } |
| |
| } |
| |
| #endif |