| /* |
| * |
| * Copyright 2015 gRPC authors. |
| * |
| * Licensed 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. |
| * |
| */ |
| |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| |
| #include "src/core/lib/security/context/security_context.h" |
| #include "src/core/lib/security/credentials/credentials.h" |
| #include "src/core/lib/security/transport/auth_filters.h" |
| #include "src/core/lib/slice/slice_internal.h" |
| |
| typedef enum { |
| STATE_INIT = 0, |
| STATE_DONE, |
| STATE_CANCELLED, |
| } async_state; |
| |
| typedef struct call_data { |
| grpc_call_combiner *call_combiner; |
| grpc_call_stack *owning_call; |
| grpc_transport_stream_op_batch *recv_initial_metadata_batch; |
| grpc_closure *original_recv_initial_metadata_ready; |
| grpc_closure recv_initial_metadata_ready; |
| grpc_metadata_array md; |
| const grpc_metadata *consumed_md; |
| size_t num_consumed_md; |
| grpc_auth_context *auth_context; |
| grpc_closure cancel_closure; |
| gpr_atm state; // async_state |
| } call_data; |
| |
| typedef struct channel_data { |
| grpc_auth_context *auth_context; |
| grpc_server_credentials *creds; |
| } channel_data; |
| |
| static grpc_metadata_array metadata_batch_to_md_array( |
| const grpc_metadata_batch *batch) { |
| grpc_linked_mdelem *l; |
| grpc_metadata_array result; |
| grpc_metadata_array_init(&result); |
| for (l = batch->list.head; l != NULL; l = l->next) { |
| grpc_metadata *usr_md = NULL; |
| grpc_mdelem md = l->md; |
| grpc_slice key = GRPC_MDKEY(md); |
| grpc_slice value = GRPC_MDVALUE(md); |
| if (result.count == result.capacity) { |
| result.capacity = GPR_MAX(result.capacity + 8, result.capacity * 2); |
| result.metadata = |
| gpr_realloc(result.metadata, result.capacity * sizeof(grpc_metadata)); |
| } |
| usr_md = &result.metadata[result.count++]; |
| usr_md->key = grpc_slice_ref_internal(key); |
| usr_md->value = grpc_slice_ref_internal(value); |
| } |
| return result; |
| } |
| |
| static grpc_filtered_mdelem remove_consumed_md(grpc_exec_ctx *exec_ctx, |
| void *user_data, |
| grpc_mdelem md) { |
| grpc_call_element *elem = user_data; |
| call_data *calld = elem->call_data; |
| size_t i; |
| for (i = 0; i < calld->num_consumed_md; i++) { |
| const grpc_metadata *consumed_md = &calld->consumed_md[i]; |
| if (grpc_slice_eq(GRPC_MDKEY(md), consumed_md->key) && |
| grpc_slice_eq(GRPC_MDVALUE(md), consumed_md->value)) |
| return GRPC_FILTERED_REMOVE(); |
| } |
| return GRPC_FILTERED_MDELEM(md); |
| } |
| |
| static void on_md_processing_done_inner(grpc_exec_ctx *exec_ctx, |
| grpc_call_element *elem, |
| const grpc_metadata *consumed_md, |
| size_t num_consumed_md, |
| const grpc_metadata *response_md, |
| size_t num_response_md, |
| grpc_error *error) { |
| call_data *calld = elem->call_data; |
| grpc_transport_stream_op_batch *batch = calld->recv_initial_metadata_batch; |
| /* TODO(jboeuf): Implement support for response_md. */ |
| if (response_md != NULL && num_response_md > 0) { |
| gpr_log(GPR_INFO, |
| "response_md in auth metadata processing not supported for now. " |
| "Ignoring..."); |
| } |
| if (error == GRPC_ERROR_NONE) { |
| calld->consumed_md = consumed_md; |
| calld->num_consumed_md = num_consumed_md; |
| error = grpc_metadata_batch_filter( |
| exec_ctx, batch->payload->recv_initial_metadata.recv_initial_metadata, |
| remove_consumed_md, elem, "Response metadata filtering error"); |
| } |
| GRPC_CLOSURE_SCHED(exec_ctx, calld->original_recv_initial_metadata_ready, |
| error); |
| } |
| |
| // Called from application code. |
| static void on_md_processing_done( |
| void *user_data, const grpc_metadata *consumed_md, size_t num_consumed_md, |
| const grpc_metadata *response_md, size_t num_response_md, |
| grpc_status_code status, const char *error_details) { |
| grpc_call_element *elem = user_data; |
| call_data *calld = elem->call_data; |
| grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; |
| // If the call was not cancelled while we were in flight, process the result. |
| if (gpr_atm_full_cas(&calld->state, (gpr_atm)STATE_INIT, |
| (gpr_atm)STATE_DONE)) { |
| grpc_error *error = GRPC_ERROR_NONE; |
| if (status != GRPC_STATUS_OK) { |
| if (error_details == NULL) { |
| error_details = "Authentication metadata processing failed."; |
| } |
| error = grpc_error_set_int( |
| GRPC_ERROR_CREATE_FROM_COPIED_STRING(error_details), |
| GRPC_ERROR_INT_GRPC_STATUS, status); |
| } |
| on_md_processing_done_inner(&exec_ctx, elem, consumed_md, num_consumed_md, |
| response_md, num_response_md, error); |
| } |
| // Clean up. |
| for (size_t i = 0; i < calld->md.count; i++) { |
| grpc_slice_unref_internal(&exec_ctx, calld->md.metadata[i].key); |
| grpc_slice_unref_internal(&exec_ctx, calld->md.metadata[i].value); |
| } |
| grpc_metadata_array_destroy(&calld->md); |
| GRPC_CALL_STACK_UNREF(&exec_ctx, calld->owning_call, "server_auth_metadata"); |
| grpc_exec_ctx_finish(&exec_ctx); |
| } |
| |
| static void cancel_call(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) { |
| grpc_call_element *elem = (grpc_call_element *)arg; |
| call_data *calld = elem->call_data; |
| // If the result was not already processed, invoke the callback now. |
| if (error != GRPC_ERROR_NONE && |
| gpr_atm_full_cas(&calld->state, (gpr_atm)STATE_INIT, |
| (gpr_atm)STATE_CANCELLED)) { |
| on_md_processing_done_inner(exec_ctx, elem, NULL, 0, NULL, 0, |
| GRPC_ERROR_REF(error)); |
| } |
| GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, "cancel_call"); |
| } |
| |
| static void recv_initial_metadata_ready(grpc_exec_ctx *exec_ctx, void *arg, |
| grpc_error *error) { |
| grpc_call_element *elem = (grpc_call_element *)arg; |
| channel_data *chand = elem->channel_data; |
| call_data *calld = elem->call_data; |
| grpc_transport_stream_op_batch *batch = calld->recv_initial_metadata_batch; |
| if (error == GRPC_ERROR_NONE) { |
| if (chand->creds != NULL && chand->creds->processor.process != NULL) { |
| // We're calling out to the application, so we need to make sure |
| // to drop the call combiner early if we get cancelled. |
| GRPC_CALL_STACK_REF(calld->owning_call, "cancel_call"); |
| GRPC_CLOSURE_INIT(&calld->cancel_closure, cancel_call, elem, |
| grpc_schedule_on_exec_ctx); |
| grpc_call_combiner_set_notify_on_cancel(exec_ctx, calld->call_combiner, |
| &calld->cancel_closure); |
| GRPC_CALL_STACK_REF(calld->owning_call, "server_auth_metadata"); |
| calld->md = metadata_batch_to_md_array( |
| batch->payload->recv_initial_metadata.recv_initial_metadata); |
| chand->creds->processor.process( |
| chand->creds->processor.state, calld->auth_context, |
| calld->md.metadata, calld->md.count, on_md_processing_done, elem); |
| return; |
| } |
| } |
| GRPC_CLOSURE_RUN(exec_ctx, calld->original_recv_initial_metadata_ready, |
| GRPC_ERROR_REF(error)); |
| } |
| |
| static void auth_start_transport_stream_op_batch( |
| grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| grpc_transport_stream_op_batch *batch) { |
| call_data *calld = elem->call_data; |
| if (batch->recv_initial_metadata) { |
| // Inject our callback. |
| calld->recv_initial_metadata_batch = batch; |
| calld->original_recv_initial_metadata_ready = |
| batch->payload->recv_initial_metadata.recv_initial_metadata_ready; |
| batch->payload->recv_initial_metadata.recv_initial_metadata_ready = |
| &calld->recv_initial_metadata_ready; |
| } |
| grpc_call_next_op(exec_ctx, elem, batch); |
| } |
| |
| /* Constructor for call_data */ |
| static grpc_error *init_call_elem(grpc_exec_ctx *exec_ctx, |
| grpc_call_element *elem, |
| const grpc_call_element_args *args) { |
| call_data *calld = elem->call_data; |
| channel_data *chand = elem->channel_data; |
| calld->call_combiner = args->call_combiner; |
| calld->owning_call = args->call_stack; |
| GRPC_CLOSURE_INIT(&calld->recv_initial_metadata_ready, |
| recv_initial_metadata_ready, elem, |
| grpc_schedule_on_exec_ctx); |
| // Create server security context. Set its auth context from channel |
| // data and save it in the call context. |
| grpc_server_security_context *server_ctx = |
| grpc_server_security_context_create(); |
| server_ctx->auth_context = grpc_auth_context_create(chand->auth_context); |
| calld->auth_context = server_ctx->auth_context; |
| if (args->context[GRPC_CONTEXT_SECURITY].value != NULL) { |
| args->context[GRPC_CONTEXT_SECURITY].destroy( |
| args->context[GRPC_CONTEXT_SECURITY].value); |
| } |
| args->context[GRPC_CONTEXT_SECURITY].value = server_ctx; |
| args->context[GRPC_CONTEXT_SECURITY].destroy = |
| grpc_server_security_context_destroy; |
| return GRPC_ERROR_NONE; |
| } |
| |
| /* Destructor for call_data */ |
| static void destroy_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| const grpc_call_final_info *final_info, |
| grpc_closure *ignored) {} |
| |
| /* Constructor for channel_data */ |
| static grpc_error *init_channel_elem(grpc_exec_ctx *exec_ctx, |
| grpc_channel_element *elem, |
| grpc_channel_element_args *args) { |
| GPR_ASSERT(!args->is_last); |
| channel_data *chand = elem->channel_data; |
| grpc_auth_context *auth_context = |
| grpc_find_auth_context_in_args(args->channel_args); |
| GPR_ASSERT(auth_context != NULL); |
| chand->auth_context = |
| GRPC_AUTH_CONTEXT_REF(auth_context, "server_auth_filter"); |
| grpc_server_credentials *creds = |
| grpc_find_server_credentials_in_args(args->channel_args); |
| chand->creds = grpc_server_credentials_ref(creds); |
| return GRPC_ERROR_NONE; |
| } |
| |
| /* Destructor for channel data */ |
| static void destroy_channel_elem(grpc_exec_ctx *exec_ctx, |
| grpc_channel_element *elem) { |
| channel_data *chand = elem->channel_data; |
| GRPC_AUTH_CONTEXT_UNREF(chand->auth_context, "server_auth_filter"); |
| grpc_server_credentials_unref(exec_ctx, chand->creds); |
| } |
| |
| const grpc_channel_filter grpc_server_auth_filter = { |
| auth_start_transport_stream_op_batch, |
| grpc_channel_next_op, |
| sizeof(call_data), |
| init_call_elem, |
| grpc_call_stack_ignore_set_pollset_or_pollset_set, |
| destroy_call_elem, |
| sizeof(channel_data), |
| init_channel_elem, |
| destroy_channel_elem, |
| grpc_channel_next_get_info, |
| "server-auth"}; |