src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_channel_secure.cc

   1 /*
   2  *
   3  * Copyright 2017 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/grpclb/grpclb_channel.h"
  22
  23 #include <string.h>
  24
  25 #include "absl/container/inlined_vector.h"
  26
  27 #include <grpc/grpc_security.h>
  28 #include <grpc/support/alloc.h>
  29 #include <grpc/support/string_util.h>
  30
  31 #include "src/core/ext/filters/client_channel/client_channel.h"
  32 #include "src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_balancer_addresses.h"
  33 #include "src/core/ext/filters/client_channel/server_address.h"
  34 #include "src/core/lib/channel/channel_args.h"
  35 #include "src/core/lib/gpr/string.h"
  36 #include "src/core/lib/iomgr/sockaddr_utils.h"
  37 #include "src/core/lib/security/credentials/credentials.h"
  38 #include "src/core/lib/slice/slice_internal.h"
  39
  40 namespace grpc_core {
  41
  42 grpc_channel_args* ModifyGrpclbBalancerChannelArgs(grpc_channel_args* args) {
  43   absl::InlinedVector<const char*, 1> args_to_remove;
  44   absl::InlinedVector<grpc_arg, 1> args_to_add;
  45   // Substitute the channel credentials with a version without call
  46   // credentials: the load balancer is not necessarily trusted to handle
  47   // bearer token credentials.
  48   grpc_channel_credentials* channel_credentials =
  49       grpc_channel_credentials_find_in_args(args);
  50   RefCountedPtr<grpc_channel_credentials> creds_sans_call_creds;
  51   if (channel_credentials != nullptr) {
  52     creds_sans_call_creds =
  53         channel_credentials->duplicate_without_call_credentials();
  54     GPR_ASSERT(creds_sans_call_creds != nullptr);
  55     args_to_remove.emplace_back(GRPC_ARG_CHANNEL_CREDENTIALS);
  56     args_to_add.emplace_back(
  57         grpc_channel_credentials_to_arg(creds_sans_call_creds.get()));
  58   }
  59   grpc_channel_args* result = grpc_channel_args_copy_and_add_and_remove(
  60       args, args_to_remove.data(), args_to_remove.size(), args_to_add.data(),
  61       args_to_add.size());
  62   // Clean up.
  63   grpc_channel_args_destroy(args);
  64   return result;
  65 }
  66
  67 grpc_channel* CreateGrpclbBalancerChannel(const char* target_uri,
  68                                           const grpc_channel_args& args) {
  69   grpc_channel_credentials* creds =
  70       grpc_channel_credentials_find_in_args(&args);
  71   if (creds == nullptr) {
  72     // Build with security but parent channel is insecure.
  73     return grpc_insecure_channel_create(target_uri, &args, nullptr);
  74   }
  75   const char* arg_to_remove = GRPC_ARG_CHANNEL_CREDENTIALS;
  76   grpc_channel_args* new_args =
  77       grpc_channel_args_copy_and_remove(&args, &arg_to_remove, 1);
  78   grpc_channel* channel =
  79       grpc_secure_channel_create(creds, target_uri, new_args, nullptr);
  80   grpc_channel_args_destroy(new_args);
  81   return channel;
  82 }
  83
  84 }  // namespace grpc_core