| /* |
| * |
| * Copyright 2015, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * 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 |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #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 struct call_data { |
| grpc_metadata_batch *recv_initial_metadata; |
| /* Closure to call when finished with the auth_on_recv hook. */ |
| grpc_closure *on_done_recv; |
| /* Receive closures are chained: we inject this closure as the on_done_recv |
| up-call on transport_op, and remember to call our on_done_recv member after |
| handling it. */ |
| grpc_closure auth_on_recv; |
| grpc_transport_stream_op *transport_op; |
| grpc_metadata_array md; |
| const grpc_metadata *consumed_md; |
| size_t num_consumed_md; |
| grpc_auth_context *auth_context; |
| } 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); |
| } |
| |
| /* 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; |
| |
| /* 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 (status == GRPC_STATUS_OK) { |
| calld->consumed_md = consumed_md; |
| calld->num_consumed_md = num_consumed_md; |
| /* TODO(ctiller): propagate error */ |
| GRPC_LOG_IF_ERROR( |
| "grpc_metadata_batch_filter", |
| grpc_metadata_batch_filter(&exec_ctx, calld->recv_initial_metadata, |
| remove_consumed_md, elem, |
| "Response metadata filtering error")); |
| 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_closure_sched(&exec_ctx, calld->on_done_recv, GRPC_ERROR_NONE); |
| } else { |
| 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); |
| error_details = error_details != NULL |
| ? error_details |
| : "Authentication metadata processing failed."; |
| calld->transport_op->send_initial_metadata = NULL; |
| if (calld->transport_op->send_message != NULL) { |
| grpc_byte_stream_destroy(&exec_ctx, calld->transport_op->send_message); |
| calld->transport_op->send_message = NULL; |
| } |
| calld->transport_op->send_trailing_metadata = NULL; |
| grpc_closure_sched( |
| &exec_ctx, calld->on_done_recv, |
| grpc_error_set_int(GRPC_ERROR_CREATE_FROM_COPIED_STRING(error_details), |
| GRPC_ERROR_INT_GRPC_STATUS, status)); |
| } |
| |
| grpc_exec_ctx_finish(&exec_ctx); |
| } |
| |
| static void auth_on_recv(grpc_exec_ctx *exec_ctx, void *user_data, |
| grpc_error *error) { |
| grpc_call_element *elem = user_data; |
| call_data *calld = elem->call_data; |
| channel_data *chand = elem->channel_data; |
| if (error == GRPC_ERROR_NONE) { |
| if (chand->creds != NULL && chand->creds->processor.process != NULL) { |
| calld->md = metadata_batch_to_md_array(calld->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_sched(exec_ctx, calld->on_done_recv, GRPC_ERROR_REF(error)); |
| } |
| |
| static void set_recv_ops_md_callbacks(grpc_call_element *elem, |
| grpc_transport_stream_op *op) { |
| call_data *calld = elem->call_data; |
| |
| if (op->recv_initial_metadata != NULL) { |
| /* substitute our callback for the higher callback */ |
| calld->recv_initial_metadata = op->recv_initial_metadata; |
| calld->on_done_recv = op->recv_initial_metadata_ready; |
| op->recv_initial_metadata_ready = &calld->auth_on_recv; |
| calld->transport_op = op; |
| } |
| } |
| |
| /* Called either: |
| - in response to an API call (or similar) from above, to send something |
| - a network event (or similar) from below, to receive something |
| op contains type and call direction information, in addition to the data |
| that is being sent or received. */ |
| static void auth_start_transport_op(grpc_exec_ctx *exec_ctx, |
| grpc_call_element *elem, |
| grpc_transport_stream_op *op) { |
| set_recv_ops_md_callbacks(elem, op); |
| grpc_call_next_op(exec_ctx, elem, op); |
| } |
| |
| /* 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) { |
| /* grab pointers to our data from the call element */ |
| call_data *calld = elem->call_data; |
| channel_data *chand = elem->channel_data; |
| grpc_server_security_context *server_ctx = NULL; |
| |
| /* initialize members */ |
| memset(calld, 0, sizeof(*calld)); |
| grpc_closure_init(&calld->auth_on_recv, auth_on_recv, elem, |
| grpc_schedule_on_exec_ctx); |
| |
| if (args->context[GRPC_CONTEXT_SECURITY].value != NULL) { |
| args->context[GRPC_CONTEXT_SECURITY].destroy( |
| args->context[GRPC_CONTEXT_SECURITY].value); |
| } |
| |
| 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; |
| |
| 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) { |
| grpc_auth_context *auth_context = |
| grpc_find_auth_context_in_args(args->channel_args); |
| grpc_server_credentials *creds = |
| grpc_find_server_credentials_in_args(args->channel_args); |
| /* grab pointers to our data from the channel element */ |
| channel_data *chand = elem->channel_data; |
| |
| GPR_ASSERT(!args->is_last); |
| GPR_ASSERT(auth_context != NULL); |
| |
| /* initialize members */ |
| chand->auth_context = |
| GRPC_AUTH_CONTEXT_REF(auth_context, "server_auth_filter"); |
| 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) { |
| /* grab pointers to our data from the channel element */ |
| 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_op, |
| 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_call_next_get_peer, |
| grpc_channel_next_get_info, |
| "server-auth"}; |