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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/alts/frame_protector/alts_record_protocol_crypter_common.h"
#include <grpc/support/alloc.h>
static void maybe_copy_error_msg(const char* src, char** dst) {
if (dst != nullptr && src != nullptr) {
*dst = static_cast<char*>(gpr_malloc(strlen(src) + 1));
memcpy(*dst, src, strlen(src) + 1);
}
}
grpc_status_code input_sanity_check(
const alts_record_protocol_crypter* rp_crypter, const unsigned char* data,
size_t* output_size, char** error_details) {
if (rp_crypter == nullptr) {
maybe_copy_error_msg("alts_crypter instance is nullptr.", error_details);
return GRPC_STATUS_INVALID_ARGUMENT;
} else if (data == nullptr) {
maybe_copy_error_msg("data is nullptr.", error_details);
return GRPC_STATUS_INVALID_ARGUMENT;
} else if (output_size == nullptr) {
maybe_copy_error_msg("output_size is nullptr.", error_details);
return GRPC_STATUS_INVALID_ARGUMENT;
}
return GRPC_STATUS_OK;
}
grpc_status_code increment_counter(alts_record_protocol_crypter* rp_crypter,
char** error_details) {
bool is_overflow = false;
grpc_status_code status =
alts_counter_increment(rp_crypter->ctr, &is_overflow, error_details);
if (status != GRPC_STATUS_OK) {
return status;
}
if (is_overflow) {
const char error_msg[] =
"crypter counter is wrapped. The connection"
"should be closed and the key should be deleted.";
maybe_copy_error_msg(error_msg, error_details);
return GRPC_STATUS_INTERNAL;
}
return GRPC_STATUS_OK;
}
size_t alts_record_protocol_crypter_num_overhead_bytes(const alts_crypter* c) {
if (c != nullptr) {
size_t num_overhead_bytes = 0;
char* error_details = nullptr;
const alts_record_protocol_crypter* rp_crypter =
reinterpret_cast<const alts_record_protocol_crypter*>(c);
grpc_status_code status = gsec_aead_crypter_tag_length(
rp_crypter->crypter, &num_overhead_bytes, &error_details);
if (status == GRPC_STATUS_OK) {
return num_overhead_bytes;
}
}
return 0;
}
void alts_record_protocol_crypter_destruct(alts_crypter* c) {
if (c != nullptr) {
alts_record_protocol_crypter* rp_crypter =
reinterpret_cast<alts_record_protocol_crypter*>(c);
alts_counter_destroy(rp_crypter->ctr);
gsec_aead_crypter_destroy(rp_crypter->crypter);
}
}
alts_record_protocol_crypter* alts_crypter_create_common(
gsec_aead_crypter* crypter, bool is_client, size_t overflow_size,
char** error_details) {
if (crypter != nullptr) {
auto* rp_crypter = static_cast<alts_record_protocol_crypter*>(
gpr_malloc(sizeof(alts_record_protocol_crypter)));
size_t counter_size = 0;
grpc_status_code status =
gsec_aead_crypter_nonce_length(crypter, &counter_size, error_details);
if (status != GRPC_STATUS_OK) {
return nullptr;
}
/* Create a counter. */
status = alts_counter_create(is_client, counter_size, overflow_size,
&rp_crypter->ctr, error_details);
if (status != GRPC_STATUS_OK) {
return nullptr;
}
rp_crypter->crypter = crypter;
return rp_crypter;
}
const char error_msg[] = "crypter is nullptr.";
maybe_copy_error_msg(error_msg, error_details);
return nullptr;
}
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