ARROW-10487 [FlightRPC][C++] Header-based auth in clients #8724
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| Original file line number | Diff line number | Diff line change |
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| // 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. | ||
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| // Interfaces for defining middleware for Flight clients. Currently | ||
| // experimental. | ||
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| #include "client_header_auth_middleware.h" | ||
| #include "client_middleware.h" | ||
| #include "client_auth.h" | ||
| #include "client.h" | ||
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| namespace arrow { | ||
| namespace flight { | ||
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| std::string base64_encode(const std::string& input); | ||
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| ClientBearerTokenMiddleware::ClientBearerTokenMiddleware( | ||
| std::pair<std::string, std::string>* bearer_token_) | ||
| : bearer_token(bearer_token_) { } | ||
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| void ClientBearerTokenMiddleware::SendingHeaders(AddCallHeaders* outgoing_headers) { } | ||
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| void ClientBearerTokenMiddleware::ReceivedHeaders( | ||
| const CallHeaders& incoming_headers) { | ||
| // Grab the auth token if one exists. | ||
| auto bearer_iter = incoming_headers.find(AUTH_HEADER); | ||
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| if (bearer_iter == incoming_headers.end()) { | ||
| return; | ||
| } | ||
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| // Check if the value of the auth token starts with the bearer prefix, latch the token. | ||
| std::string bearer_val = bearer_iter->second.to_string(); | ||
| if (bearer_val.size() > BEARER_PREFIX.size()) { | ||
| bool hasPrefix = std::equal(bearer_val.begin(), bearer_val.begin() + BEARER_PREFIX.size(), BEARER_PREFIX.begin(), | ||
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| [] (const char& char1, const char& char2) { | ||
| return (std::toupper(char1) == std::toupper(char2)); | ||
| } | ||
| ); | ||
| if (hasPrefix) { | ||
| *bearer_token = std::make_pair(AUTH_HEADER, bearer_val); | ||
| } | ||
| } | ||
| } | ||
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| void ClientBearerTokenMiddleware::CallCompleted(const Status& status) { } | ||
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| void ClientBearerTokenFactory::StartCall(const CallInfo& info, std::unique_ptr<ClientMiddleware>* middleware) { | ||
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| *middleware = std::unique_ptr<ClientBearerTokenMiddleware>(new ClientBearerTokenMiddleware(bearer_token)); | ||
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| } | ||
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| void ClientBearerTokenFactory::Reset() { | ||
| *bearer_token = std::make_pair("", ""); | ||
| } | ||
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| template<typename ... Args> | ||
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| std::string string_format(const std::string& format, const Args... args) { | ||
| // Check size requirement for new string and increment by 1 for null terminator. | ||
| size_t size = std::snprintf(nullptr, 0, format.c_str(), args ...) + 1; | ||
| if(size <= 0){ | ||
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| throw std::runtime_error("Error during string formatting. Format: '" + format + "'."); | ||
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| } | ||
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| // Create buffer for new string and write string in. | ||
| std::unique_ptr<char[]> buf(new char[size]); | ||
| std::snprintf(buf.get(), size, format.c_str(), args...); | ||
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| // Convert to std::string, subtracting size by 1 to trim null terminator. | ||
| return std::string(buf.get(), buf.get() + size - 1); | ||
| } | ||
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| void AddBasicAuthHeaders(grpc::ClientContext* context, const std::string& username, const std::string& password) { | ||
| const std::string formatted_credentials = string_format("%s:%s", username.c_str(), password.c_str()); | ||
| context->AddMetadata(AUTH_HEADER, BASIC_PREFIX + base64_encode(formatted_credentials)); | ||
| } | ||
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| std::string base64_encode(const std::string& input) { | ||
| static const std::string base64_chars = | ||
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| "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; | ||
| auto get_encoded_length = [] (const std::string& in) { | ||
| return 4 * ((in.size() + 2) / 3); | ||
| }; | ||
| auto get_overwrite_count = [] (const std::string& in) { | ||
| const std::string::size_type remainder = in.length() % 3; | ||
| return (remainder > 0) ? (3 - (remainder % 3)) : 0; | ||
| }; | ||
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| // Generate string with required length for encoding. | ||
| std::string encoded; | ||
| encoded.reserve(get_encoded_length(input)); | ||
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| // Loop through input writing base64 characters to string. | ||
| for (int i = 0; i < input.length();) { | ||
| uint32_t octet_1 = i < input.length() ? (unsigned char)input[i++] : 0; | ||
| uint32_t octet_2 = i < input.length() ? (unsigned char)input[i++] : 0; | ||
| uint32_t octet_3 = i < input.length() ? (unsigned char)input[i++] : 0; | ||
| uint32_t octriple = (octet_1 << 0x10) + (octet_2 << 0x08) + octet_3; | ||
| for (int j = 3; j >= 0; j--) { | ||
| encoded.push_back(base64_chars[(octriple >> j * 6) & 0x3F]); | ||
| } | ||
| } | ||
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| // Round up to nearest multiple of 3 and replace characters at end based on rounding. | ||
| int overwrite_count = get_overwrite_count(input); | ||
| encoded.replace(encoded.length() - overwrite_count, | ||
| encoded.length(), | ||
| overwrite_count, '='); | ||
| return encoded; | ||
| } | ||
| } // namespace flight | ||
| } // namespace arrow | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| // Licensed to the Apache Software Foundation (ASF) under one | ||
|
Member
There was a problem hiding this comment. This should probably be an _internal.h header since I don't think any of this is intended to be directly used outside of the implementation here. |
||
| // 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. | ||
|
|
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| // Interfaces for defining middleware for Flight clients. Currently | ||
| // experimental. | ||
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| #pragma once | ||
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| #include "arrow/flight/client_middleware.h" | ||
| #include "arrow/flight/client_auth.h" | ||
| #include "arrow/flight/client.h" | ||
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| #ifdef GRPCPP_PP_INCLUDE | ||
| #include <grpcpp/grpcpp.h> | ||
| #if defined(GRPC_NAMESPACE_FOR_TLS_CREDENTIALS_OPTIONS) | ||
| #include <grpcpp/security/tls_credentials_options.h> | ||
|
Member
There was a problem hiding this comment. I don't think we need this include? |
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| #endif | ||
| #else | ||
| #include <grpc++/grpc++.h> | ||
| #endif | ||
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| #include <algorithm> | ||
| #include <iostream> | ||
| #include <cctype> | ||
| #include <string> | ||
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| const std::string AUTH_HEADER = "authorization"; | ||
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| const std::string BEARER_PREFIX = "Bearer "; | ||
| const std::string BASIC_PREFIX = "Basic "; | ||
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| namespace arrow { | ||
| namespace flight { | ||
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| // TODO: Need to add documentation in this file. | ||
| void ARROW_FLIGHT_EXPORT AddBasicAuthHeaders(grpc::ClientContext* context, | ||
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| const std::string& username, | ||
| const std::string& password); | ||
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| class ARROW_FLIGHT_EXPORT ClientBearerTokenMiddleware : public ClientMiddleware { | ||
| public: | ||
| explicit ClientBearerTokenMiddleware( | ||
| std::pair<std::string, std::string>* bearer_token_); | ||
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| void SendingHeaders(AddCallHeaders* outgoing_headers); | ||
| void ReceivedHeaders(const CallHeaders& incoming_headers); | ||
| void CallCompleted(const Status& status); | ||
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| private: | ||
| std::pair<std::string, std::string>* bearer_token; | ||
| }; | ||
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| class ARROW_FLIGHT_EXPORT ClientBearerTokenFactory : public ClientMiddlewareFactory { | ||
| public: | ||
| explicit ClientBearerTokenFactory(std::pair<std::string, std::string>* bearer_token_) | ||
| : bearer_token(bearer_token_) {} | ||
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| void StartCall(const CallInfo& info, std::unique_ptr<ClientMiddleware>* middleware); | ||
| void Reset(); | ||
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| private: | ||
| std::pair<std::string, std::string>* bearer_token; | ||
| }; | ||
| } // namespace flight | ||
| } // namespace arrow | ||
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Is this ordering alphabetical? If so this should be up one...
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Yes, was waiting for feedback on design before proper formatting. I will correct this.