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/*
*
* Copyright 2016 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 "src/core/lib/security/credentials/plugin/plugin_credentials.h"
#include <string.h>
#include <grpc/grpc.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include <grpc/support/sync.h>
#include "src/core/lib/slice/slice_internal.h"
#include "src/core/lib/slice/slice_string_helpers.h"
#include "src/core/lib/surface/api_trace.h"
#include "src/core/lib/surface/validate_metadata.h"
typedef struct {
void *user_data;
grpc_credentials_metadata_cb cb;
} grpc_metadata_plugin_request;
static void plugin_destruct(grpc_exec_ctx *exec_ctx,
grpc_call_credentials *creds) {
grpc_plugin_credentials *c = (grpc_plugin_credentials *)creds;
if (c->plugin.state != NULL && c->plugin.destroy != NULL) {
c->plugin.destroy(c->plugin.state);
}
}
static void plugin_md_request_metadata_ready(void *request,
const grpc_metadata *md,
size_t num_md,
grpc_status_code status,
const char *error_details) {
/* called from application code */
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INITIALIZER(
GRPC_EXEC_CTX_FLAG_IS_FINISHED | GRPC_EXEC_CTX_FLAG_THREAD_RESOURCE_LOOP,
NULL, NULL);
grpc_metadata_plugin_request *r = (grpc_metadata_plugin_request *)request;
if (status != GRPC_STATUS_OK) {
if (error_details != NULL) {
gpr_log(GPR_ERROR, "Getting metadata from plugin failed with error: %s",
error_details);
}
r->cb(&exec_ctx, r->user_data, NULL, 0, GRPC_CREDENTIALS_ERROR,
error_details);
} else {
size_t i;
bool seen_illegal_header = false;
grpc_credentials_md *md_array = NULL;
for (i = 0; i < num_md; i++) {
if (!GRPC_LOG_IF_ERROR("validate_metadata_from_plugin",
grpc_validate_header_key_is_legal(md[i].key))) {
seen_illegal_header = true;
break;
} else if (!grpc_is_binary_header(md[i].key) &&
!GRPC_LOG_IF_ERROR(
"validate_metadata_from_plugin",
grpc_validate_header_nonbin_value_is_legal(md[i].value))) {
gpr_log(GPR_ERROR, "Plugin added invalid metadata value.");
seen_illegal_header = true;
break;
}
}
if (seen_illegal_header) {
r->cb(&exec_ctx, r->user_data, NULL, 0, GRPC_CREDENTIALS_ERROR,
"Illegal metadata");
} else if (num_md > 0) {
md_array = gpr_malloc(num_md * sizeof(grpc_credentials_md));
for (i = 0; i < num_md; i++) {
md_array[i].key = grpc_slice_ref_internal(md[i].key);
md_array[i].value = grpc_slice_ref_internal(md[i].value);
}
r->cb(&exec_ctx, r->user_data, md_array, num_md, GRPC_CREDENTIALS_OK,
NULL);
for (i = 0; i < num_md; i++) {
grpc_slice_unref_internal(&exec_ctx, md_array[i].key);
grpc_slice_unref_internal(&exec_ctx, md_array[i].value);
}
gpr_free(md_array);
} else if (num_md == 0) {
r->cb(&exec_ctx, r->user_data, NULL, 0, GRPC_CREDENTIALS_OK, NULL);
}
}
gpr_free(r);
grpc_exec_ctx_finish(&exec_ctx);
}
static void plugin_get_request_metadata(grpc_exec_ctx *exec_ctx,
grpc_call_credentials *creds,
grpc_polling_entity *pollent,
grpc_auth_metadata_context context,
grpc_credentials_metadata_cb cb,
void *user_data) {
grpc_plugin_credentials *c = (grpc_plugin_credentials *)creds;
if (c->plugin.get_metadata != NULL) {
grpc_metadata_plugin_request *request = gpr_zalloc(sizeof(*request));
request->user_data = user_data;
request->cb = cb;
c->plugin.get_metadata(c->plugin.state, context,
plugin_md_request_metadata_ready, request);
} else {
cb(exec_ctx, user_data, NULL, 0, GRPC_CREDENTIALS_OK, NULL);
}
}
static grpc_call_credentials_vtable plugin_vtable = {
plugin_destruct, plugin_get_request_metadata};
grpc_call_credentials *grpc_metadata_credentials_create_from_plugin(
grpc_metadata_credentials_plugin plugin, void *reserved) {
grpc_plugin_credentials *c = gpr_zalloc(sizeof(*c));
GRPC_API_TRACE("grpc_metadata_credentials_create_from_plugin(reserved=%p)", 1,
(reserved));
GPR_ASSERT(reserved == NULL);
c->base.type = plugin.type;
c->base.vtable = &plugin_vtable;
gpr_ref_init(&c->base.refcount, 1);
c->plugin = plugin;
return &c->base;
}
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