legacy-libs/grpc/deps/grpc/src/core/ext/filters/client_channel/lb_policy/xds/xds_channel_secure.cc

   1 /*
   2  *
   3  * Copyright 2018 gRPC authors.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  *
  17  */
  18
  19 #include <grpc/support/port_platform.h>
  20
  21 #include "src/core/ext/filters/client_channel/lb_policy/xds/xds_channel.h"
  22
  23 #include <string.h>
  24
  25 #include <grpc/grpc_security.h>
  26 #include <grpc/support/alloc.h>
  27 #include <grpc/support/string_util.h>
  28
  29 #include "src/core/ext/filters/client_channel/client_channel.h"
  30 #include "src/core/ext/filters/client_channel/server_address.h"
  31 #include "src/core/lib/channel/channel_args.h"
  32 #include "src/core/lib/gpr/string.h"
  33 #include "src/core/lib/iomgr/sockaddr_utils.h"
  34 #include "src/core/lib/security/credentials/credentials.h"
  35 #include "src/core/lib/security/transport/target_authority_table.h"
  36 #include "src/core/lib/slice/slice_internal.h"
  37
  38 namespace grpc_core {
  39
  40 grpc_channel_args* ModifyXdsBalancerChannelArgs(grpc_channel_args* args) {
  41   InlinedVector<const char*, 1> args_to_remove;
  42   InlinedVector<grpc_arg, 2> args_to_add;
  43   // Substitute the channel credentials with a version without call
  44   // credentials: the load balancer is not necessarily trusted to handle
  45   // bearer token credentials.
  46   grpc_channel_credentials* channel_credentials =
  47       grpc_channel_credentials_find_in_args(args);
  48   RefCountedPtr<grpc_channel_credentials> creds_sans_call_creds;
  49   if (channel_credentials != nullptr) {
  50     creds_sans_call_creds =
  51         channel_credentials->duplicate_without_call_credentials();
  52     GPR_ASSERT(creds_sans_call_creds != nullptr);
  53     args_to_remove.emplace_back(GRPC_ARG_CHANNEL_CREDENTIALS);
  54     args_to_add.emplace_back(
  55         grpc_channel_credentials_to_arg(creds_sans_call_creds.get()));
  56   }
  57   grpc_channel_args* result = grpc_channel_args_copy_and_add_and_remove(
  58       args, args_to_remove.data(), args_to_remove.size(), args_to_add.data(),
  59       args_to_add.size());
  60   // Clean up.
  61   grpc_channel_args_destroy(args);
  62   return result;
  63 }
  64
  65 grpc_channel* CreateXdsBalancerChannel(const char* target_uri,
  66                                        const grpc_channel_args& args) {
  67   grpc_channel_credentials* creds =
  68       grpc_channel_credentials_find_in_args(&args);
  69   if (creds == nullptr) {
  70     // Build with security but parent channel is insecure.
  71     return grpc_insecure_channel_create(target_uri, &args, nullptr);
  72   }
  73   const char* arg_to_remove = GRPC_ARG_CHANNEL_CREDENTIALS;
  74   grpc_channel_args* new_args =
  75       grpc_channel_args_copy_and_remove(&args, &arg_to_remove, 1);
  76   grpc_channel* channel =
  77       grpc_secure_channel_create(creds, target_uri, new_args, nullptr);
  78   grpc_channel_args_destroy(new_args);
  79   return channel;
  80 }
  81
  82 }  // namespace grpc_core