421 lines
11 KiB
C++
421 lines
11 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2022
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include "td/net/SslStream.h"
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#if !TD_EMSCRIPTEN
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#include "td/utils/common.h"
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#include "td/utils/crypto.h"
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#include "td/utils/logging.h"
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#include "td/utils/misc.h"
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#include "td/utils/port/IPAddress.h"
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#include "td/utils/Status.h"
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#include "td/utils/Time.h"
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#include <openssl/bio.h>
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#include <openssl/err.h>
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#include <openssl/ssl.h>
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#include <openssl/x509.h>
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#include <cstring>
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#include <memory>
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namespace td {
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namespace detail {
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namespace {
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#if OPENSSL_VERSION_NUMBER < 0x10100000L
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void *BIO_get_data(BIO *b) {
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return b->ptr;
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}
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void BIO_set_data(BIO *b, void *ptr) {
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b->ptr = ptr;
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}
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void BIO_set_init(BIO *b, int init) {
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b->init = init;
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}
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int BIO_get_new_index() {
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return 0;
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}
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BIO_METHOD *BIO_meth_new(int type, const char *name) {
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auto res = new BIO_METHOD();
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std::memset(res, 0, sizeof(*res));
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return res;
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}
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int BIO_meth_set_write(BIO_METHOD *biom, int (*bwrite)(BIO *, const char *, int)) {
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biom->bwrite = bwrite;
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return 1;
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}
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int BIO_meth_set_read(BIO_METHOD *biom, int (*bread)(BIO *, char *, int)) {
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biom->bread = bread;
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return 1;
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}
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int BIO_meth_set_ctrl(BIO_METHOD *biom, long (*ctrl)(BIO *, int, long, void *)) {
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biom->ctrl = ctrl;
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return 1;
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}
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int BIO_meth_set_create(BIO_METHOD *biom, int (*create)(BIO *)) {
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biom->create = create;
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return 1;
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}
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int BIO_meth_set_destroy(BIO_METHOD *biom, int (*destroy)(BIO *)) {
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biom->destroy = destroy;
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return 1;
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}
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#endif
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int strm_create(BIO *b) {
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BIO_set_init(b, 1);
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return 1;
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}
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int strm_destroy(BIO *b) {
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return 1;
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}
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int strm_read(BIO *b, char *buf, int len);
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int strm_write(BIO *b, const char *buf, int len);
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long strm_ctrl(BIO *b, int cmd, long num, void *ptr) {
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switch (cmd) {
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case BIO_CTRL_FLUSH:
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return 1;
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case BIO_CTRL_PUSH:
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case BIO_CTRL_POP:
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return 0;
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#if OPENSSL_VERSION_NUMBER >= 0x30000000L
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case BIO_CTRL_GET_KTLS_SEND:
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case BIO_CTRL_GET_KTLS_RECV:
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return 0;
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#endif
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default:
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LOG(FATAL) << b << " " << cmd << " " << num << " " << ptr;
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}
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return 1;
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}
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BIO_METHOD *BIO_s_sslstream() {
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static BIO_METHOD *result = [] {
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BIO_METHOD *res = BIO_meth_new(BIO_get_new_index(), "td::SslStream helper bio");
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BIO_meth_set_write(res, strm_write);
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BIO_meth_set_read(res, strm_read);
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BIO_meth_set_create(res, strm_create);
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BIO_meth_set_destroy(res, strm_destroy);
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BIO_meth_set_ctrl(res, strm_ctrl);
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return res;
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}();
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return result;
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}
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struct SslHandleDeleter {
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void operator()(SSL *ssl_handle) {
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auto start_time = Time::now();
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if (SSL_is_init_finished(ssl_handle)) {
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clear_openssl_errors("Before SSL_shutdown");
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SSL_set_quiet_shutdown(ssl_handle, 1);
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SSL_shutdown(ssl_handle);
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clear_openssl_errors("After SSL_shutdown");
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}
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SSL_free(ssl_handle);
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auto elapsed_time = Time::now() - start_time;
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if (elapsed_time >= 0.1) {
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LOG(ERROR) << "SSL_free took " << elapsed_time << " seconds";
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}
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}
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};
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using SslHandle = std::unique_ptr<SSL, SslHandleDeleter>;
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} // namespace
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class SslStreamImpl {
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public:
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Status init(CSlice host, SslCtx ssl_ctx, bool check_ip_address_as_host) {
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if (!ssl_ctx) {
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return Status::Error("Invalid SSL context provided");
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}
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clear_openssl_errors("Before SslFd::init");
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auto ssl_handle = SslHandle(SSL_new(static_cast<SSL_CTX *>(ssl_ctx.get_openssl_ctx())));
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if (!ssl_handle) {
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return create_openssl_error(-13, "Failed to create an SSL handle");
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}
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auto r_ip_address = IPAddress::get_ip_address(host);
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#if OPENSSL_VERSION_NUMBER >= 0x10002000L
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X509_VERIFY_PARAM *param = SSL_get0_param(ssl_handle.get());
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X509_VERIFY_PARAM_set_hostflags(param, 0);
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if (r_ip_address.is_ok() && !check_ip_address_as_host) {
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LOG(DEBUG) << "Set verification IP address to " << r_ip_address.ok().get_ip_str();
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X509_VERIFY_PARAM_set1_ip_asc(param, r_ip_address.ok().get_ip_str().c_str());
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} else {
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LOG(DEBUG) << "Set verification host to " << host;
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X509_VERIFY_PARAM_set1_host(param, host.c_str(), 0);
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}
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#else
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#warning DANGEROUS! HTTPS HOST WILL NOT BE CHECKED. INSTALL OPENSSL >= 1.0.2 OR IMPLEMENT HTTPS HOST CHECK MANUALLY
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#endif
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auto *bio = BIO_new(BIO_s_sslstream());
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BIO_set_data(bio, static_cast<void *>(this));
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SSL_set_bio(ssl_handle.get(), bio, bio);
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#if OPENSSL_VERSION_NUMBER >= 0x0090806fL && !defined(OPENSSL_NO_TLSEXT)
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if (r_ip_address.is_error()) { // IP address must not be send as SNI
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LOG(DEBUG) << "Set SNI host name to " << host;
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auto host_str = host.str();
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SSL_set_tlsext_host_name(ssl_handle.get(), MutableCSlice(host_str).begin());
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}
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#endif
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SSL_set_connect_state(ssl_handle.get());
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ssl_handle_ = std::move(ssl_handle);
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return Status::OK();
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}
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ByteFlowInterface &read_byte_flow() {
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return read_flow_;
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}
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ByteFlowInterface &write_byte_flow() {
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return write_flow_;
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}
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size_t flow_read(MutableSlice slice) {
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return read_flow_.read(slice);
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}
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size_t flow_write(Slice slice) {
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return write_flow_.write(slice);
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}
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private:
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SslHandle ssl_handle_;
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friend class SslReadByteFlow;
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friend class SslWriteByteFlow;
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Result<size_t> write(Slice slice) {
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clear_openssl_errors("Before SslFd::write");
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auto start_time = Time::now();
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auto size = SSL_write(ssl_handle_.get(), slice.data(), static_cast<int>(slice.size()));
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auto elapsed_time = Time::now() - start_time;
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if (elapsed_time >= 0.1) {
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LOG(ERROR) << "SSL_write of size " << slice.size() << " took " << elapsed_time << " seconds and returned " << size
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<< ' ' << SSL_get_error(ssl_handle_.get(), size);
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}
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if (size <= 0) {
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return process_ssl_error(size);
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}
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return size;
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}
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Result<size_t> read(MutableSlice slice) {
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clear_openssl_errors("Before SslFd::read");
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auto start_time = Time::now();
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auto size = SSL_read(ssl_handle_.get(), slice.data(), static_cast<int>(slice.size()));
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auto elapsed_time = Time::now() - start_time;
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if (elapsed_time >= 0.1) {
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LOG(ERROR) << "SSL_read took " << elapsed_time << " seconds and returned " << size << ' '
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<< SSL_get_error(ssl_handle_.get(), size);
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}
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if (size <= 0) {
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return process_ssl_error(size);
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}
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return size;
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}
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class SslReadByteFlow final : public ByteFlowBase {
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public:
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explicit SslReadByteFlow(SslStreamImpl *stream) : stream_(stream) {
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}
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bool loop() final {
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auto to_read = output_.prepare_append();
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auto r_size = stream_->read(to_read);
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if (r_size.is_error()) {
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finish(r_size.move_as_error());
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return false;
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}
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auto size = r_size.move_as_ok();
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if (size == 0) {
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return false;
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}
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output_.confirm_append(size);
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return true;
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}
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size_t read(MutableSlice data) {
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return input_->advance(min(data.size(), input_->size()), data);
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}
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private:
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SslStreamImpl *stream_;
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};
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class SslWriteByteFlow final : public ByteFlowBase {
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public:
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explicit SslWriteByteFlow(SslStreamImpl *stream) : stream_(stream) {
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}
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bool loop() final {
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auto to_write = input_->prepare_read();
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auto r_size = stream_->write(to_write);
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if (r_size.is_error()) {
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finish(r_size.move_as_error());
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return false;
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}
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auto size = r_size.move_as_ok();
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if (size == 0) {
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return false;
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}
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input_->confirm_read(size);
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return true;
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}
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size_t write(Slice data) {
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output_.append(data);
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return data.size();
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}
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private:
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SslStreamImpl *stream_;
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};
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SslReadByteFlow read_flow_{this};
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SslWriteByteFlow write_flow_{this};
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Result<size_t> process_ssl_error(int ret) {
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auto os_error = OS_ERROR("SSL_ERROR_SYSCALL");
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int error = SSL_get_error(ssl_handle_.get(), ret);
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switch (error) {
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case SSL_ERROR_NONE:
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LOG(ERROR) << "SSL_get_error returned no error";
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return 0;
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case SSL_ERROR_ZERO_RETURN:
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LOG(DEBUG) << "SSL_ZERO_RETURN";
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return 0;
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case SSL_ERROR_WANT_READ:
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LOG(DEBUG) << "SSL_WANT_READ";
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return 0;
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case SSL_ERROR_WANT_WRITE:
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LOG(DEBUG) << "SSL_WANT_WRITE";
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return 0;
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case SSL_ERROR_WANT_CONNECT:
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case SSL_ERROR_WANT_ACCEPT:
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case SSL_ERROR_WANT_X509_LOOKUP:
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LOG(DEBUG) << "SSL: CONNECT ACCEPT LOOKUP";
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return 0;
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case SSL_ERROR_SYSCALL:
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if (ERR_peek_error() == 0) {
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if (os_error.code() != 0) {
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LOG(DEBUG) << "SSL_ERROR_SYSCALL";
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return std::move(os_error);
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} else {
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LOG(DEBUG) << "SSL_SYSCALL";
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return 0;
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}
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}
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/* fallthrough */
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default:
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LOG(DEBUG) << "SSL_ERROR Default";
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return create_openssl_error(1, "SSL error ");
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}
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}
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};
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namespace {
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int strm_read(BIO *b, char *buf, int len) {
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auto *stream = static_cast<SslStreamImpl *>(BIO_get_data(b));
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CHECK(stream != nullptr);
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BIO_clear_retry_flags(b);
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CHECK(buf != nullptr);
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auto res = narrow_cast<int>(stream->flow_read(MutableSlice(buf, len)));
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if (res == 0) {
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BIO_set_retry_read(b);
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return -1;
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}
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return res;
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}
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int strm_write(BIO *b, const char *buf, int len) {
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auto *stream = static_cast<SslStreamImpl *>(BIO_get_data(b));
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CHECK(stream != nullptr);
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BIO_clear_retry_flags(b);
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CHECK(buf != nullptr);
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return narrow_cast<int>(stream->flow_write(Slice(buf, len)));
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}
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} // namespace
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} // namespace detail
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SslStream::SslStream() = default;
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SslStream::SslStream(SslStream &&) noexcept = default;
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SslStream &SslStream::operator=(SslStream &&) noexcept = default;
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SslStream::~SslStream() = default;
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Result<SslStream> SslStream::create(CSlice host, SslCtx ssl_ctx, bool use_ip_address_as_host) {
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auto impl = make_unique<detail::SslStreamImpl>();
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TRY_STATUS(impl->init(host, ssl_ctx, use_ip_address_as_host));
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return SslStream(std::move(impl));
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}
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SslStream::SslStream(unique_ptr<detail::SslStreamImpl> impl) : impl_(std::move(impl)) {
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}
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ByteFlowInterface &SslStream::read_byte_flow() {
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return impl_->read_byte_flow();
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}
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ByteFlowInterface &SslStream::write_byte_flow() {
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return impl_->write_byte_flow();
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}
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size_t SslStream::flow_read(MutableSlice slice) {
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return impl_->flow_read(slice);
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}
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size_t SslStream::flow_write(Slice slice) {
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return impl_->flow_write(slice);
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}
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} // namespace td
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#else
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namespace td {
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namespace detail {
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class SslStreamImpl {};
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} // namespace detail
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SslStream::SslStream() = default;
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SslStream::SslStream(SslStream &&) noexcept = default;
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SslStream &SslStream::operator=(SslStream &&) noexcept = default;
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SslStream::~SslStream() = default;
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Result<SslStream> SslStream::create(CSlice host, SslCtx ssl_ctx, bool check_ip_address_as_host) {
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return Status::Error("Not supported in Emscripten");
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}
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SslStream::SslStream(unique_ptr<detail::SslStreamImpl> impl) : impl_(std::move(impl)) {
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}
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ByteFlowInterface &SslStream::read_byte_flow() {
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UNREACHABLE();
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}
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ByteFlowInterface &SslStream::write_byte_flow() {
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UNREACHABLE();
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}
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size_t SslStream::flow_read(MutableSlice slice) {
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UNREACHABLE();
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}
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size_t SslStream::flow_write(Slice slice) {
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UNREACHABLE();
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}
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} // namespace td
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#endif
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