89 lines
2.9 KiB
C++
89 lines
2.9 KiB
C++
//
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//
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// Copyright 2019 gRPC authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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//
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#include <algorithm>
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#include <memory>
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#include <string>
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#include <vector>
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#include "absl/log/log.h"
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#include "upb/mem/arena.hpp"
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#include <grpc/grpc_security_constants.h>
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#include <grpcpp/security/alts_context.h>
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#include <grpcpp/security/alts_util.h>
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#include <grpcpp/security/auth_context.h>
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#include <grpcpp/support/status.h>
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#include <grpcpp/support/string_ref.h>
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#include "src/core/tsi/alts/handshaker/alts_tsi_handshaker.h"
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#include "src/proto/grpc/gcp/altscontext.upb.h"
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namespace grpc {
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namespace experimental {
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std::unique_ptr<AltsContext> GetAltsContextFromAuthContext(
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const std::shared_ptr<const AuthContext>& auth_context) {
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if (auth_context == nullptr) {
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LOG(ERROR) << "auth_context is nullptr.";
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return nullptr;
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}
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std::vector<string_ref> ctx_vector =
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auth_context->FindPropertyValues(TSI_ALTS_CONTEXT);
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if (ctx_vector.size() != 1) {
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LOG(ERROR) << "contains zero or more than one ALTS context.";
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return nullptr;
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}
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upb::Arena context_arena;
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grpc_gcp_AltsContext* ctx = grpc_gcp_AltsContext_parse(
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ctx_vector[0].data(), ctx_vector[0].size(), context_arena.ptr());
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if (ctx == nullptr) {
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LOG(ERROR) << "fails to parse ALTS context.";
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return nullptr;
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}
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if (grpc_gcp_AltsContext_security_level(ctx) < GRPC_SECURITY_MIN ||
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grpc_gcp_AltsContext_security_level(ctx) > GRPC_SECURITY_MAX) {
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LOG(ERROR) << "security_level is invalid.";
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return nullptr;
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}
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return std::make_unique<AltsContext>(AltsContext(ctx));
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}
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grpc::Status AltsClientAuthzCheck(
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const std::shared_ptr<const AuthContext>& auth_context,
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const std::vector<std::string>& expected_service_accounts) {
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std::unique_ptr<AltsContext> alts_ctx =
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GetAltsContextFromAuthContext(auth_context);
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if (alts_ctx == nullptr) {
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return grpc::Status(grpc::StatusCode::PERMISSION_DENIED,
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"fails to parse ALTS context.");
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}
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if (std::find(expected_service_accounts.begin(),
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expected_service_accounts.end(),
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alts_ctx->peer_service_account()) !=
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expected_service_accounts.end()) {
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return grpc::Status::OK;
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}
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return grpc::Status(
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grpc::StatusCode::PERMISSION_DENIED,
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"client " + alts_ctx->peer_service_account() + " is not authorized.");
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}
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} // namespace experimental
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} // namespace grpc
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