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tdlight/benchmark/check_tls.cpp
levlam 97b2191697 Update TLS ClientHello. 
GitOrigin-RevId: c7555b5f569c17fa0b1600c9d4cfb6bc4310b4b5
2020-07-09 16:59:57 +03:00

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/BigNum.h"
#include "td/utils/common.h"
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/port/detail/Iocp.h"
#include "td/utils/port/IPAddress.h"
#include "td/utils/port/sleep.h"
#include "td/utils/port/SocketFd.h"
#include "td/utils/port/thread.h"
#include "td/utils/Random.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
#include "td/utils/Time.h"
#include <map>
static td::BigNumContext context;
static bool is_quadratic_residue(const td::BigNum &a) {
// 2^255 - 19
td::BigNum mod =
td::BigNum::from_hex("7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffed").move_as_ok();
// (mod - 1) / 2 = 2^254 - 10
td::BigNum pow =
td::BigNum::from_hex("3ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff6").move_as_ok();
td::BigNum r;
td::BigNum::mod_exp(r, a, pow, mod, context);
td::BigNum one = td::BigNum::from_decimal("1").move_as_ok();
td::BigNum::mod_add(r, r, one, mod, context);
td::string result = r.to_decimal();
CHECK(result == "0" || result == "1" || result == "2");
return result == "2";
}
struct TlsInfo {
td::vector<size_t> extension_list;
td::vector<size_t> encrypted_application_data_length;
};
td::Result<TlsInfo> test_tls(const td::string &url) {
td::IPAddress address;
TRY_STATUS(address.init_host_port(url, 443));
TRY_RESULT(socket, td::SocketFd::open(address));
td::string request;
auto add_string = [&](td::Slice data) {
request.append(data.data(), data.size());
};
auto add_random = [&](size_t length) {
while (length-- > 0) {
request += static_cast<char>(td::Random::secure_int32());
}
};
auto add_length = [&](size_t length) {
request += static_cast<char>(length / 256);
request += static_cast<char>(length % 256);
};
auto add_key = [&] {
td::string key(32, '\0');
td::BigNum mod =
td::BigNum::from_hex("7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffed").move_as_ok();
while (true) {
td::Random::secure_bytes(key);
key[31] = static_cast<char>(key[31] & 127);
td::BigNum x = td::BigNum::from_le_binary(key);
if (!is_quadratic_residue(x)) {
continue;
}
td::BigNum y = x.clone();
td::BigNum coef = td::BigNum::from_decimal("486662").move_as_ok();
td::BigNum::mod_add(y, y, coef, mod, context);
td::BigNum::mod_mul(y, y, x, mod, context);
td::BigNum one = td::BigNum::from_decimal("1").move_as_ok();
td::BigNum::mod_add(y, y, one, mod, context);
td::BigNum::mod_mul(y, y, x, mod, context);
// y = x^3 + 486662 * x^2 + x
if (is_quadratic_residue(y)) {
break;
}
}
request += key;
};
const size_t MAX_GREASE = 7;
char greases[MAX_GREASE];
td::Random::secure_bytes(td::MutableSlice{greases, MAX_GREASE});
for (size_t i = 0; i < MAX_GREASE; i++) {
greases[i] = static_cast<char>((greases[i] & 0xF0) + 0x0A);
}
for (size_t i = 1; i < MAX_GREASE; i += 2) {
if (greases[i] == greases[i - 1]) {
greases[i] = static_cast<char>(0x10 ^ greases[i]);
}
}
auto add_grease = [&](size_t num) {
auto c = greases[num];
request += c;
request += c;
};
add_string("\x16\x03\x01\x02\x00\x01\x00\x01\xfc\x03\x03");
add_random(32);
add_string("\x20");
add_random(32);
add_string("\x00\x20");
add_grease(0);
add_string(
"\x13\x01\x13\x02\x13\x03\xc0\x2b\xc0\x2f\xc0\x2c\xc0\x30\xcc\xa9\xcc\xa8\xc0\x13\xc0\x14\x00\x9c\x00\x9d\x00"
"\x2f\x00\x35\x01\x00\x01\x93");
add_grease(2);
add_string("\x00\x00\x00\x00");
add_length(url.size() + 5);
add_length(url.size() + 3);
add_string("\x00");
add_length(url.size());
add_string(url);
add_string("\x00\x17\x00\x00\xff\x01\x00\x01\x00\x00\x0a\x00\x0a\x00\x08");
add_grease(4);
add_string(
"\x00\x1d\x00\x17\x00\x18\x00\x0b\x00\x02\x01\x00\x00\x23\x00\x00\x00\x10\x00\x0e\x00\x0c\x02\x68\x32\x08\x68"
"\x74\x74\x70\x2f\x31\x2e\x31\x00\x05\x00\x05\x01\x00\x00\x00\x00\x00\x0d\x00\x14\x00\x12\x04\x03\x08\x04\x04"
"\x01\x05\x03\x08\x05\x05\x01\x08\x06\x06\x01\x00\x12\x00\x00\x00\x33\x00\x2b\x00\x29");
add_grease(4);
add_string("\x00\x01\x00\x00\x1d\x00\x20");
add_key();
add_string("\x00\x2d\x00\x02\x01\x01\x00\x2b\x00\x0b\x0a");
add_grease(6);
add_string("\x03\x04\x03\x03\x03\x02\x03\x01\x00\x1b\x00\x03\x02\x00\x02");
add_grease(3);
add_string("\x00\x01\x00\x00\x15");
auto padding = 515 - static_cast<int>(request.size());
CHECK(padding >= 0);
add_length(padding);
request.resize(517);
// LOG(ERROR) << td::format::as_hex_dump<0>(td::Slice(request));
TRY_STATUS(socket.write(request));
TlsInfo info;
auto end_time = td::Time::now() + 3;
td::string result;
size_t pos = 0;
size_t server_hello_length = 0;
size_t encrypted_application_data_length_sum = 0;
while (td::Time::now() < end_time) {
char buf[20000];
TRY_RESULT(res, socket.read(td::MutableSlice{buf, sizeof(buf)}));
if (res > 0) {
auto read_length = [&]() -> size_t {
CHECK(result.size() >= 2 + pos);
pos += 2;
return static_cast<unsigned char>(result[pos - 2]) * 256 + static_cast<unsigned char>(result[pos - 1]);
};
result += td::Slice(buf, res).str();
while (true) {
#define CHECK_LENGTH(length) \
if (pos + (length) > result.size()) { \
break; \
}
#define EXPECT_STR(pos, str, error) \
if (!begins_with(td::Slice(result).substr(pos), str)) { \
return td::Status::Error(error); \
}
if (pos == 0) {
CHECK_LENGTH(3);
EXPECT_STR(0, "\x16\x03\x03", "Non-TLS response or TLS <= 1.1");
pos += 3;
}
if (pos == 3) {
CHECK_LENGTH(2);
server_hello_length = read_length();
if (server_hello_length <= 39) {
return td::Status::Error("Receive too short server hello");
}
}
if (server_hello_length > 0) {
if (pos == 5) {
CHECK_LENGTH(server_hello_length);
EXPECT_STR(5, "\x02\x00", "Non-TLS response 2");
EXPECT_STR(9, "\x03\x03", "Non-TLS response 3");
auto random_id = td::Slice(result.c_str() + 11, 32);
if (random_id ==
"\xcf\x21\xad\x74\xe5\x9a\x61\x11\xbe\x1d\x8c\x02\x1e\x65\xb8\x91\xc2\xa2\x11\x16\x7a\xbb\x8c\x5e\x07"
"\x9e\x09\xe2\xc8\xa8\x33\x9c") {
return td::Status::Error("TLS 1.3 servers returning HelloRetryRequest are not supprted");
}
if (result[43] == '\x00') {
return td::Status::Error("TLS <= 1.2: empty session_id");
}
EXPECT_STR(43, "\x20", "Non-TLS response 4");
if (server_hello_length <= 75) {
return td::Status::Error("Receive too short server hello 2");
}
EXPECT_STR(44, request.substr(44, 32), "TLS <= 1.2: expected mirrored session_id");
EXPECT_STR(76, "\x13\x01\x00", "TLS <= 1.2: expected 0x1301 as a chosen cipher");
pos += 74;
size_t extensions_length = read_length();
if (extensions_length + 76 != server_hello_length) {
return td::Status::Error("Receive wrong extensions length");
}
while (pos < 5 + server_hello_length - 4) {
info.extension_list.push_back(read_length());
size_t extension_length = read_length();
if (pos + extension_length > 5 + server_hello_length) {
return td::Status::Error("Receive wrong extension length");
}
pos += extension_length;
}
if (pos != 5 + server_hello_length) {
return td::Status::Error("Receive wrong extensions list");
}
}
if (pos == 5 + server_hello_length) {
CHECK_LENGTH(6);
EXPECT_STR(pos, "\x14\x03\x03\x00\x01\x01", "Expected dummy ChangeCipherSpec");
pos += 6;
}
if (pos == 11 + server_hello_length + encrypted_application_data_length_sum) {
if (pos == result.size()) {
return info;
}
CHECK_LENGTH(3);
EXPECT_STR(pos, "\x17\x03\x03", "Expected encrypted application data");
pos += 3;
}
if (pos == 14 + server_hello_length + encrypted_application_data_length_sum) {
CHECK_LENGTH(2);
size_t encrypted_application_data_length = read_length();
info.encrypted_application_data_length.push_back(encrypted_application_data_length);
if (encrypted_application_data_length == 0) {
return td::Status::Error("Receive empty encrypted application data");
}
}
if (pos == 16 + server_hello_length + encrypted_application_data_length_sum) {
CHECK_LENGTH(info.encrypted_application_data_length.back());
pos += info.encrypted_application_data_length.back();
encrypted_application_data_length_sum += info.encrypted_application_data_length.back() + 5;
}
}
}
} else {
td::usleep_for(10000);
}
}
// LOG(ERROR) << url << ":" << td::format::as_hex_dump<0>(td::Slice(result));
return td::Status::Error("Failed to get response in 3 seconds");
}
int main(int argc, char *argv[]) {
SET_VERBOSITY_LEVEL(VERBOSITY_NAME(WARNING));
#if TD_PORT_WINDOWS
auto iocp = td::make_unique<td::detail::Iocp>();
iocp->init();
auto iocp_thread = td::thread([&iocp] { iocp->loop(); });
td::detail::Iocp::Guard iocp_guard(iocp.get());
#endif
td::vector<td::string> urls;
for (int i = 1; i < argc; i++) {
urls.emplace_back(argv[i]);
}
for (auto &url : urls) {
const int MAX_TRIES = 100;
td::vector<std::map<size_t, int>> length_count;
td::vector<size_t> extension_list;
for (int i = 0; i < MAX_TRIES; i++) {
auto r_tls_info = test_tls(url);
if (r_tls_info.is_error()) {
LOG(ERROR) << url << ": " << r_tls_info.error();
break;
} else {
auto tls_info = r_tls_info.move_as_ok();
if (length_count.size() < tls_info.encrypted_application_data_length.size()) {
length_count.resize(tls_info.encrypted_application_data_length.size());
}
for (size_t t = 0; t < tls_info.encrypted_application_data_length.size(); t++) {
length_count[t][tls_info.encrypted_application_data_length[t]]++;
}
if (i == 0) {
extension_list = tls_info.extension_list;
} else {
if (extension_list != tls_info.extension_list) {
LOG(ERROR) << url << ": TLS 1.3.0 extension list has changed from " << extension_list << " to "
<< tls_info.extension_list;
break;
}
}
}
if (i == MAX_TRIES - 1) {
if (extension_list != td::vector<size_t>{51, 43} && extension_list != td::vector<size_t>{43, 51}) {
LOG(ERROR) << url << ": TLS 1.3.0 unsupported extension list " << extension_list;
} else {
td::string length_distribution = "|";
for (size_t t = 0; t < length_count.size(); t++) {
for (auto it : length_count[t]) {
length_distribution += PSTRING()
<< it.first << " : " << static_cast<int>(it.second * 100.0 / MAX_TRIES) << "%|";
}
if (t + 1 != length_count.size()) {
length_distribution += " + |";
}
}
LOG(ERROR) << url << ": TLS 1.3.0 with extensions " << extension_list << " and "
<< (length_count.size() != 1 ? "unsupported " : "")
<< "encrypted application data length distribution " << length_distribution;
}
}
}
}
#if TD_PORT_WINDOWS
iocp->interrupt_loop();
iocp_thread.join();
#endif
}
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