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/* Copyright 2018 The TensorFlow Authors. All Rights Reserved.
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 "ignite_ssl_wrapper.h"
#include "tensorflow/core/lib/core/errors.h"
#include "tensorflow/core/platform/logging.h"
#include <openssl/err.h>
#include <openssl/ssl.h>
namespace ignite {
static int PasswordCb(char *buf, int size, int rwflag, void *password) {
strncpy(buf, (char *)(password), size);
buf[size - 1] = '\0';
return (strlen(buf));
}
SslWrapper::SslWrapper(std::shared_ptr<Client> client, std::string certfile,
std::string keyfile, std::string cert_password)
: client(client),
certfile(certfile),
keyfile(keyfile),
cert_password(cert_password),
ctx(NULL) {}
SslWrapper::~SslWrapper() {
if (IsConnected()) {
tensorflow::Status status = Disconnect();
if (!status.ok()) LOG(WARNING) << status.ToString();
}
if (ctx != NULL) {
SSL_CTX_free(ctx);
ctx = NULL;
}
}
tensorflow::Status SslWrapper::InitSslContext() {
OpenSSL_add_all_algorithms();
SSL_load_error_strings();
ctx = SSL_CTX_new(SSLv23_method());
if (ctx == NULL)
return tensorflow::errors::Internal("Couldn't create SSL context");
SSL_CTX_set_default_passwd_cb(ctx, PasswordCb);
SSL_CTX_set_default_passwd_cb_userdata(ctx, (void *)cert_password.c_str());
if (SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str()) != 1)
return tensorflow::errors::Internal(
"Couldn't load cetificate chain (file '", certfile, "')");
std::string private_key_file = keyfile.empty() ? certfile : keyfile;
if (SSL_CTX_use_PrivateKey_file(ctx, private_key_file.c_str(),
SSL_FILETYPE_PEM) != 1)
return tensorflow::errors::Internal("Couldn't load private key (file '",
private_key_file, "')");
return tensorflow::Status::OK();
}
tensorflow::Status SslWrapper::Connect() {
tensorflow::Status status;
if (ctx == NULL) {
status = InitSslContext();
if (!status.ok()) return status;
}
ssl = SSL_new(ctx);
if (ssl == NULL)
return tensorflow::errors::Internal("Failed to establish SSL connection");
status = client->Connect();
if (!status.ok()) return status;
SSL_set_fd(ssl, client->GetSocketDescriptor());
if (SSL_connect(ssl) != 1)
return tensorflow::errors::Internal("Failed to establish SSL connection");
LOG(INFO) << "SSL connection established";
return tensorflow::Status::OK();
}
tensorflow::Status SslWrapper::Disconnect() {
SSL_free(ssl);
LOG(INFO) << "SSL connection closed";
return client->Disconnect();
}
bool SslWrapper::IsConnected() { return client->IsConnected(); }
int SslWrapper::GetSocketDescriptor() { return client->GetSocketDescriptor(); }
tensorflow::Status SslWrapper::ReadData(uint8_t *buf, int32_t length) {
int recieved = 0;
while (recieved < length) {
int res = SSL_read(ssl, buf, length - recieved);
if (res < 0)
return tensorflow::errors::Internal(
"Error occured while reading from SSL socket: ", res);
if (res == 0)
return tensorflow::errors::Internal("Server closed SSL connection");
recieved += res;
buf += res;
}
return tensorflow::Status::OK();
}
tensorflow::Status SslWrapper::WriteData(uint8_t *buf, int32_t length) {
int sent = 0;
while (sent < length) {
int res = SSL_write(ssl, buf, length - sent);
if (res < 0)
return tensorflow::errors::Internal(
"Error occured while writing into socket: ", res);
sent += res;
buf += res;
}
return tensorflow::Status::OK();
}
} // namespace ignite
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