/* * * 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 #include #include #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"};