src/cpp/server/secure_server_credentials.cc

/*
 *
 * Copyright 2015, Google Inc.
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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 */

#include <functional>
#include <map>
#include <memory>


#include "src/cpp/common/secure_auth_context.h"
#include "src/cpp/server/secure_server_credentials.h"

#include <grpc++/auth_metadata_processor.h>

namespace grpc {

void AuthMetadataProcessorAyncWrapper::Process(
    void* self, grpc_auth_context* context, const grpc_metadata* md,
    size_t md_count, grpc_process_auth_metadata_done_cb cb, void* user_data) {
  AuthMetadataProcessorAyncWrapper* instance =
      reinterpret_cast<AuthMetadataProcessorAyncWrapper*>(self);
  instance->thread_pool_->Add(
      std::bind(&AuthMetadataProcessorAyncWrapper::ProcessAsync, instance,
                context, md, md_count, cb, user_data));
}

void AuthMetadataProcessorAyncWrapper::ProcessAsync(
    grpc_auth_context* ctx, const grpc_metadata* md, size_t md_count,
    grpc_process_auth_metadata_done_cb cb, void* user_data) {
  SecureAuthContext context(ctx);
  std::multimap<grpc::string, grpc::string> metadata;
  for (size_t i = 0; i < md_count; i++) {
    metadata.insert(std::make_pair(
        md[i].key, grpc::string(md[i].value, md[i].value_length)));
  }
  std::multimap<grpc::string, grpc::string> consumed_metadata;
  bool ok = processor_->Process(metadata, &context, &consumed_metadata);
  if (ok) {
    std::vector<grpc_metadata> consumed_md(consumed_metadata.size());
    for (const auto& entry : consumed_metadata) {
      consumed_md.push_back({entry.first.c_str(),
                             entry.second.data(),
                             entry.second.size(),
                             {{nullptr, nullptr, nullptr}}});
    }
    cb(user_data, &consumed_md[0], consumed_md.size(), 1);
  } else {
    cb(user_data, nullptr, 0, 0);
  }
}

int SecureServerCredentials::AddPortToServer(
    const grpc::string& addr, grpc_server* server) {
  return grpc_server_add_secure_http2_port(server, addr.c_str(), creds_);
}

void SecureServerCredentials::SetAuthMetadataProcessor(
    const std::shared_ptr<AuthMetadataProcessor>& processor) {
  processor_.reset(new AuthMetadataProcessorAyncWrapper(processor));
  grpc_server_credentials_set_auth_metadata_processor(
      creds_, {AuthMetadataProcessorAyncWrapper::Process, processor_.get()});
}

std::shared_ptr<ServerCredentials> SslServerCredentials(
    const SslServerCredentialsOptions& options) {
  std::vector<grpc_ssl_pem_key_cert_pair> pem_key_cert_pairs;
  for (auto key_cert_pair = options.pem_key_cert_pairs.begin();
       key_cert_pair != options.pem_key_cert_pairs.end(); key_cert_pair++) {
    grpc_ssl_pem_key_cert_pair p = {key_cert_pair->private_key.c_str(),
                                    key_cert_pair->cert_chain.c_str()};
    pem_key_cert_pairs.push_back(p);
  }
  grpc_server_credentials* c_creds = grpc_ssl_server_credentials_create(
      options.pem_root_certs.empty() ? nullptr : options.pem_root_certs.c_str(),
      &pem_key_cert_pairs[0], pem_key_cert_pairs.size(),
      options.force_client_auth);
  return std::shared_ptr<ServerCredentials>(
      new SecureServerCredentials(c_creds));
}

}  // namespace grpc