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/*
*
* Copyright 2018 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 <grpc/support/port_platform.h>
#include "src/core/tsi/local_transport_security.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include "src/core/lib/iomgr/exec_ctx.h"
#include "src/core/tsi/transport_security_grpc.h"
#define TSI_LOCAL_PEER_IDENTITY "local"
/* Main struct for local TSI zero-copy frame protector. */
typedef struct local_zero_copy_grpc_protector {
tsi_zero_copy_grpc_protector base;
} local_zero_copy_grpc_protector;
/* Main struct for local TSI handshaker result. */
typedef struct local_tsi_handshaker_result {
tsi_handshaker_result base;
char* peer_identity;
bool is_client;
} local_tsi_handshaker_result;
/* Main struct for local TSI handshaker. */
typedef struct local_tsi_handshaker {
tsi_handshaker base;
bool is_client;
} local_tsi_handshaker;
/* --- tsi_zero_copy_grpc_protector methods implementation. --- */
static tsi_result local_zero_copy_grpc_protector_protect(
tsi_zero_copy_grpc_protector* self, grpc_slice_buffer* unprotected_slices,
grpc_slice_buffer* protected_slices) {
if (self == nullptr || unprotected_slices == nullptr ||
protected_slices == nullptr) {
gpr_log(GPR_ERROR, "Invalid nullptr arguments to zero-copy grpc protect.");
return TSI_INVALID_ARGUMENT;
}
grpc_slice_buffer_move_into(unprotected_slices, protected_slices);
return TSI_OK;
}
static tsi_result local_zero_copy_grpc_protector_unprotect(
tsi_zero_copy_grpc_protector* self, grpc_slice_buffer* protected_slices,
grpc_slice_buffer* unprotected_slices) {
if (self == nullptr || unprotected_slices == nullptr ||
protected_slices == nullptr) {
gpr_log(GPR_ERROR,
"Invalid nullptr arguments to zero-copy grpc unprotect.");
return TSI_INVALID_ARGUMENT;
}
grpc_slice_buffer_move_into(protected_slices, unprotected_slices);
return TSI_OK;
}
static void local_zero_copy_grpc_protector_destroy(
tsi_zero_copy_grpc_protector* self) {
gpr_free(self);
}
static const tsi_zero_copy_grpc_protector_vtable
local_zero_copy_grpc_protector_vtable = {
local_zero_copy_grpc_protector_protect,
local_zero_copy_grpc_protector_unprotect,
local_zero_copy_grpc_protector_destroy};
tsi_result local_zero_copy_grpc_protector_create(
tsi_zero_copy_grpc_protector** protector) {
if (grpc_core::ExecCtx::Get() == nullptr || protector == nullptr) {
gpr_log(
GPR_ERROR,
"Invalid nullptr arguments to local_zero_copy_grpc_protector create.");
return TSI_INVALID_ARGUMENT;
}
local_zero_copy_grpc_protector* impl =
static_cast<local_zero_copy_grpc_protector*>(gpr_zalloc(sizeof(*impl)));
impl->base.vtable = &local_zero_copy_grpc_protector_vtable;
*protector = &impl->base;
return TSI_OK;
}
/* --- tsi_handshaker_result methods implementation. --- */
static tsi_result handshaker_result_extract_peer(
const tsi_handshaker_result* self, tsi_peer* peer) {
return TSI_OK;
}
static tsi_result handshaker_result_create_zero_copy_grpc_protector(
const tsi_handshaker_result* self, size_t* max_output_protected_frame_size,
tsi_zero_copy_grpc_protector** protector) {
if (self == nullptr || protector == nullptr) {
gpr_log(GPR_ERROR,
"Invalid arguments to create_zero_copy_grpc_protector()");
return TSI_INVALID_ARGUMENT;
}
tsi_result ok = local_zero_copy_grpc_protector_create(protector);
if (ok != TSI_OK) {
gpr_log(GPR_ERROR, "Failed to create zero-copy grpc protector");
}
return ok;
}
static void handshaker_result_destroy(tsi_handshaker_result* self) {
if (self == nullptr) {
return;
}
local_tsi_handshaker_result* result =
reinterpret_cast<local_tsi_handshaker_result*>(
const_cast<tsi_handshaker_result*>(self));
gpr_free(result->peer_identity);
gpr_free(result);
}
static const tsi_handshaker_result_vtable result_vtable = {
handshaker_result_extract_peer,
handshaker_result_create_zero_copy_grpc_protector,
nullptr, /* handshaker_result_create_frame_protector */
nullptr, /* handshaker_result_get_unused_bytes */
handshaker_result_destroy};
static tsi_result create_handshaker_result(bool is_client,
tsi_handshaker_result** self) {
if (self == nullptr) {
gpr_log(GPR_ERROR, "Invalid arguments to create_handshaker_result()");
return TSI_INVALID_ARGUMENT;
}
local_tsi_handshaker_result* result =
static_cast<local_tsi_handshaker_result*>(gpr_zalloc(sizeof(*result)));
result->is_client = is_client;
result->base.vtable = &result_vtable;
/* Create a peer identity with random information that will be later converted
* to auth context. Without this peer identity, the santiy check in {client,
* server}_auth_filter that verifies if the peer's auth context is obtained
* during handshakes will fail. Since the peer identity information in auth
* context is only checked for its existence (not actually used), we only
* populate some random data and later will provision more meaningful peer if
* needed (e.g., peer's pid/uid/gid from credentials).
*/
result->peer_identity = gpr_strdup(TSI_LOCAL_PEER_IDENTITY);
*self = &result->base;
return TSI_OK;
}
/* --- tsi_handshaker methods implementation. --- */
static tsi_result handshaker_next(
tsi_handshaker* self, const unsigned char* received_bytes,
size_t received_bytes_size, const unsigned char** bytes_to_send,
size_t* bytes_to_send_size, tsi_handshaker_result** result,
tsi_handshaker_on_next_done_cb cb, void* user_data) {
if (self == nullptr) {
gpr_log(GPR_ERROR, "Invalid arguments to handshaker_next()");
return TSI_INVALID_ARGUMENT;
}
/* Note that there is no interaction between TSI peers, and all operations are
* local.
*/
local_tsi_handshaker* handshaker =
reinterpret_cast<local_tsi_handshaker*>(self);
*bytes_to_send_size = 0;
create_handshaker_result(handshaker->is_client, result);
return TSI_OK;
}
static void handshaker_destroy(tsi_handshaker* self) {
if (self == nullptr) {
return;
}
local_tsi_handshaker* handshaker =
reinterpret_cast<local_tsi_handshaker*>(self);
gpr_free(handshaker);
}
static const tsi_handshaker_vtable handshaker_vtable = {
nullptr, /* get_bytes_to_send_to_peer -- deprecated */
nullptr, /* process_bytes_from_peer -- deprecated */
nullptr, /* get_result -- deprecated */
nullptr, /* extract_peer -- deprecated */
nullptr, /* create_frame_protector -- deprecated */
handshaker_destroy,
handshaker_next,
nullptr, /* shutdown */
};
tsi_result local_tsi_handshaker_create(bool is_client, tsi_handshaker** self) {
if (self == nullptr) {
gpr_log(GPR_ERROR, "Invalid arguments to local_tsi_handshaker_create()");
return TSI_INVALID_ARGUMENT;
}
local_tsi_handshaker* handshaker =
static_cast<local_tsi_handshaker*>(gpr_zalloc(sizeof(*handshaker)));
handshaker->is_client = is_client;
handshaker->base.vtable = &handshaker_vtable;
*self = &handshaker->base;
return TSI_OK;
}
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