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/*
*
* 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 struct call_data {
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;
} 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_transport_stream_op_batch *batch = calld->recv_initial_metadata_batch;
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...");
}
grpc_error *error = GRPC_ERROR_NONE;
if (status == GRPC_STATUS_OK) {
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");
} else {
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);
}
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->original_recv_initial_metadata_ready,
error);
grpc_exec_ctx_finish(&exec_ctx);
}
static void recv_initial_metadata_ready(grpc_exec_ctx *exec_ctx, void *arg,
grpc_error *error) {
grpc_call_element *elem = 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) {
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;
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_call_next_get_peer,
grpc_channel_next_get_info,
"server-auth"};
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