mirror of
https://github.com/classilla/tenfourfox.git
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626 lines
21 KiB
C++
626 lines
21 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ssl.h"
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#include "sslproto.h"
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#include <memory>
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#include "tls_parser.h"
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#include "tls_filter.h"
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#include "tls_connect.h"
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namespace nss_test {
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class TlsExtensionFilter : public TlsHandshakeFilter {
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protected:
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virtual bool FilterHandshake(uint16_t version, uint8_t handshake_type,
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const DataBuffer& input, DataBuffer* output) {
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if (handshake_type == kTlsHandshakeClientHello) {
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TlsParser parser(input);
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if (!FindClientHelloExtensions(parser, version)) {
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return false;
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}
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return FilterExtensions(parser, input, output);
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}
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if (handshake_type == kTlsHandshakeServerHello) {
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TlsParser parser(input);
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if (!FindServerHelloExtensions(parser, version)) {
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return false;
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}
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return FilterExtensions(parser, input, output);
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}
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return false;
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}
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virtual bool FilterExtension(uint16_t extension_type,
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const DataBuffer& input, DataBuffer* output) = 0;
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public:
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static bool FindClientHelloExtensions(TlsParser& parser, uint16_t version) {
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if (!parser.Skip(2 + 32)) { // version + random
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return false;
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}
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if (!parser.SkipVariable(1)) { // session ID
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return false;
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}
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if (IsDtls(version) && !parser.SkipVariable(1)) { // DTLS cookie
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return false;
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}
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if (!parser.SkipVariable(2)) { // cipher suites
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return false;
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}
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if (!parser.SkipVariable(1)) { // compression methods
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return false;
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}
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return true;
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}
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static bool FindServerHelloExtensions(TlsParser& parser, uint16_t version) {
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if (!parser.Skip(2 + 32)) { // version + random
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return false;
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}
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if (!parser.SkipVariable(1)) { // session ID
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return false;
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}
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if (!parser.Skip(2)) { // cipher suite
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return false;
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}
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if (NormalizeTlsVersion(version) <= SSL_LIBRARY_VERSION_TLS_1_2) {
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if (!parser.Skip(1)) { // compression method
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return false;
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}
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}
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return true;
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}
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private:
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bool FilterExtensions(TlsParser& parser,
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const DataBuffer& input, DataBuffer* output) {
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size_t length_offset = parser.consumed();
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uint32_t all_extensions;
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if (!parser.Read(&all_extensions, 2)) {
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return false; // no extensions, odd but OK
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}
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if (all_extensions != parser.remaining()) {
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return false; // malformed
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}
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bool changed = false;
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// Write out the start of the message.
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output->Allocate(input.len());
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output->Write(0, input.data(), parser.consumed());
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size_t output_offset = parser.consumed();
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while (parser.remaining()) {
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uint32_t extension_type;
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if (!parser.Read(&extension_type, 2)) {
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return false; // malformed
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}
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// Copy extension type.
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output->Write(output_offset, extension_type, 2);
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DataBuffer extension;
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if (!parser.ReadVariable(&extension, 2)) {
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return false; // malformed
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}
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output_offset = ApplyFilter(static_cast<uint16_t>(extension_type), extension,
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output, output_offset + 2, &changed);
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}
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output->Truncate(output_offset);
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if (changed) {
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size_t newlen = output->len() - length_offset - 2;
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if (newlen >= 0x10000) {
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return false; // bad: size increased too much
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}
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output->Write(length_offset, newlen, 2);
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}
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return changed;
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}
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size_t ApplyFilter(uint16_t extension_type, const DataBuffer& extension,
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DataBuffer* output, size_t offset, bool* changed) {
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const DataBuffer* source = &extension;
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DataBuffer filtered;
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if (FilterExtension(extension_type, extension, &filtered) &&
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filtered.len() < 0x10000) {
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*changed = true;
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std::cerr << "extension old: " << extension << std::endl;
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std::cerr << "extension new: " << filtered << std::endl;
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source = &filtered;
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}
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output->Write(offset, source->len(), 2);
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output->Write(offset + 2, *source);
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return offset + 2 + source->len();
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}
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};
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class TlsExtensionTruncator : public TlsExtensionFilter {
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public:
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TlsExtensionTruncator(uint16_t extension, size_t length)
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: extension_(extension), length_(length) {}
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virtual bool FilterExtension(uint16_t extension_type,
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const DataBuffer& input, DataBuffer* output) {
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if (extension_type != extension_) {
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return false;
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}
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if (input.len() <= length_) {
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return false;
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}
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output->Assign(input.data(), length_);
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return true;
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}
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private:
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uint16_t extension_;
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size_t length_;
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};
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class TlsExtensionDamager : public TlsExtensionFilter {
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public:
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TlsExtensionDamager(uint16_t extension, size_t index)
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: extension_(extension), index_(index) {}
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virtual bool FilterExtension(uint16_t extension_type,
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const DataBuffer& input, DataBuffer* output) {
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if (extension_type != extension_) {
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return false;
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}
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*output = input;
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output->data()[index_] += 73; // Increment selected for maximum damage
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return true;
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}
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private:
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uint16_t extension_;
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size_t index_;
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};
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class TlsExtensionReplacer : public TlsExtensionFilter {
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public:
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TlsExtensionReplacer(uint16_t extension, const DataBuffer& data)
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: extension_(extension), data_(data) {}
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virtual bool FilterExtension(uint16_t extension_type,
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const DataBuffer& input, DataBuffer* output) {
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if (extension_type != extension_) {
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return false;
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}
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*output = data_;
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return true;
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}
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private:
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const uint16_t extension_;
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const DataBuffer data_;
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};
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class TlsExtensionInjector : public TlsHandshakeFilter {
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public:
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TlsExtensionInjector(uint16_t ext, DataBuffer& data)
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: extension_(ext), data_(data) {}
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virtual bool FilterHandshake(uint16_t version, uint8_t handshake_type,
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const DataBuffer& input, DataBuffer* output) {
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size_t offset;
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if (handshake_type == kTlsHandshakeClientHello) {
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TlsParser parser(input);
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if (!TlsExtensionFilter::FindClientHelloExtensions(parser, version)) {
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return false;
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}
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offset = parser.consumed();
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} else if (handshake_type == kTlsHandshakeServerHello) {
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TlsParser parser(input);
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if (!TlsExtensionFilter::FindServerHelloExtensions(parser, version)) {
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return false;
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}
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offset = parser.consumed();
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} else {
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return false;
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}
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*output = input;
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std::cerr << "Pre:" << input << std::endl;
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std::cerr << "Lof:" << offset << std::endl;
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// Increase the size of the extensions.
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uint16_t* len_addr = reinterpret_cast<uint16_t*>(output->data() + offset);
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std::cerr << "L-p:" << ntohs(*len_addr) << std::endl;
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*len_addr = htons(ntohs(*len_addr) + data_.len() + 4);
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std::cerr << "L-i:" << ntohs(*len_addr) << std::endl;
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// Insert the extension type and length.
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DataBuffer type_length;
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type_length.Allocate(4);
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type_length.Write(0, extension_, 2);
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type_length.Write(2, data_.len(), 2);
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output->Splice(type_length, offset + 2);
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// Insert the payload.
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output->Splice(data_, offset + 6);
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std::cerr << "Aft:" << *output << std::endl;
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return true;
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}
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private:
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const uint16_t extension_;
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const DataBuffer data_;
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};
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class TlsExtensionCapture : public TlsExtensionFilter {
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public:
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TlsExtensionCapture(uint16_t ext)
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: extension_(ext), data_() {}
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virtual bool FilterExtension(uint16_t extension_type,
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const DataBuffer& input, DataBuffer* output) {
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if (extension_type == extension_) {
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data_.Assign(input);
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}
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return false;
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}
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const DataBuffer& extension() const { return data_; }
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private:
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const uint16_t extension_;
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DataBuffer data_;
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};
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class TlsExtensionTestBase : public TlsConnectTestBase {
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protected:
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TlsExtensionTestBase(Mode mode, uint16_t version)
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: TlsConnectTestBase(mode, version) {}
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void ClientHelloErrorTest(PacketFilter* filter,
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uint8_t alert = kTlsAlertDecodeError) {
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auto alert_recorder = new TlsAlertRecorder();
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server_->SetPacketFilter(alert_recorder);
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if (filter) {
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client_->SetPacketFilter(filter);
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}
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ConnectExpectFail();
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EXPECT_EQ(kTlsAlertFatal, alert_recorder->level());
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EXPECT_EQ(alert, alert_recorder->description());
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}
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void ServerHelloErrorTest(PacketFilter* filter,
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uint8_t alert = kTlsAlertDecodeError) {
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auto alert_recorder = new TlsAlertRecorder();
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client_->SetPacketFilter(alert_recorder);
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if (filter) {
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server_->SetPacketFilter(filter);
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}
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ConnectExpectFail();
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EXPECT_EQ(kTlsAlertFatal, alert_recorder->level());
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EXPECT_EQ(alert, alert_recorder->description());
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}
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static void InitSimpleSni(DataBuffer* extension) {
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const char* name = "host.name";
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const size_t namelen = PL_strlen(name);
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extension->Allocate(namelen + 5);
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extension->Write(0, namelen + 3, 2);
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extension->Write(2, static_cast<uint32_t>(0), 1); // 0 == hostname
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extension->Write(3, namelen, 2);
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extension->Write(5, reinterpret_cast<const uint8_t*>(name), namelen);
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}
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};
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class TlsExtensionTestDtls
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: public TlsExtensionTestBase,
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public ::testing::WithParamInterface<uint16_t> {
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public:
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TlsExtensionTestDtls() : TlsExtensionTestBase(DGRAM, GetParam()) {}
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};
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class TlsExtensionTest12Plus
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: public TlsExtensionTestBase,
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public ::testing::WithParamInterface<std::string> {
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public:
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TlsExtensionTest12Plus()
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: TlsExtensionTestBase(TlsConnectTestBase::ToMode(GetParam()),
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SSL_LIBRARY_VERSION_TLS_1_2) {}
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};
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class TlsExtensionTestGeneric
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: public TlsExtensionTestBase,
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public ::testing::WithParamInterface<std::tuple<std::string, uint16_t>> {
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public:
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TlsExtensionTestGeneric()
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: TlsExtensionTestBase(TlsConnectTestBase::ToMode((std::get<0>(GetParam()))),
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std::get<1>(GetParam())) {}
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};
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TEST_P(TlsExtensionTestGeneric, DamageSniLength) {
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ClientHelloErrorTest(new TlsExtensionDamager(ssl_server_name_xtn, 1));
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}
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TEST_P(TlsExtensionTestGeneric, DamageSniHostLength) {
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ClientHelloErrorTest(new TlsExtensionDamager(ssl_server_name_xtn, 4));
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}
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TEST_P(TlsExtensionTestGeneric, TruncateSni) {
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ClientHelloErrorTest(new TlsExtensionTruncator(ssl_server_name_xtn, 7));
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}
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// A valid extension that appears twice will be reported as unsupported.
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TEST_P(TlsExtensionTestGeneric, RepeatSni) {
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DataBuffer extension;
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InitSimpleSni(&extension);
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ClientHelloErrorTest(new TlsExtensionInjector(ssl_server_name_xtn, extension),
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kTlsAlertIllegalParameter);
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}
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// An SNI entry with zero length is considered invalid (strangely, not if it is
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// the last entry, which is probably a bug).
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TEST_P(TlsExtensionTestGeneric, BadSni) {
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DataBuffer simple;
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InitSimpleSni(&simple);
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DataBuffer extension;
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extension.Allocate(simple.len() + 3);
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extension.Write(0, static_cast<uint32_t>(0), 3);
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extension.Write(3, simple);
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ClientHelloErrorTest(new TlsExtensionReplacer(ssl_server_name_xtn, extension));
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}
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TEST_P(TlsExtensionTestGeneric, EmptySni) {
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DataBuffer extension;
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extension.Allocate(2);
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extension.Write(0, static_cast<uint32_t>(0), 2);
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ClientHelloErrorTest(new TlsExtensionReplacer(ssl_server_name_xtn, extension));
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}
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TEST_P(TlsExtensionTestGeneric, EmptyAlpnExtension) {
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EnableAlpn();
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DataBuffer extension;
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ClientHelloErrorTest(new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension),
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kTlsAlertIllegalParameter);
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}
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// An empty ALPN isn't considered bad, though it does lead to there being no
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// protocol for the server to select.
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TEST_P(TlsExtensionTestGeneric, EmptyAlpnList) {
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EnableAlpn();
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const uint8_t val[] = { 0x00, 0x00 };
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DataBuffer extension(val, sizeof(val));
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ClientHelloErrorTest(new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension),
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kTlsAlertNoApplicationProtocol);
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}
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TEST_P(TlsExtensionTestGeneric, OneByteAlpn) {
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EnableAlpn();
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ClientHelloErrorTest(new TlsExtensionTruncator(ssl_app_layer_protocol_xtn, 1));
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}
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TEST_P(TlsExtensionTestGeneric, AlpnMissingValue) {
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EnableAlpn();
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// This will leave the length of the second entry, but no value.
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ClientHelloErrorTest(new TlsExtensionTruncator(ssl_app_layer_protocol_xtn, 5));
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}
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TEST_P(TlsExtensionTestGeneric, AlpnZeroLength) {
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EnableAlpn();
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const uint8_t val[] = { 0x01, 0x61, 0x00 };
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DataBuffer extension(val, sizeof(val));
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ClientHelloErrorTest(new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension));
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}
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TEST_P(TlsExtensionTestGeneric, AlpnMismatch) {
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const uint8_t client_alpn[] = { 0x01, 0x61 };
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client_->EnableAlpn(client_alpn, sizeof(client_alpn));
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const uint8_t server_alpn[] = { 0x02, 0x61, 0x62 };
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server_->EnableAlpn(server_alpn, sizeof(server_alpn));
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ClientHelloErrorTest(nullptr, kTlsAlertNoApplicationProtocol);
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}
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TEST_P(TlsExtensionTestGeneric, AlpnReturnedEmptyList) {
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EnableAlpn();
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const uint8_t val[] = { 0x00, 0x00 };
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DataBuffer extension(val, sizeof(val));
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ServerHelloErrorTest(new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension));
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}
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TEST_P(TlsExtensionTestGeneric, AlpnReturnedEmptyName) {
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EnableAlpn();
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const uint8_t val[] = { 0x00, 0x01, 0x00 };
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DataBuffer extension(val, sizeof(val));
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ServerHelloErrorTest(new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension));
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}
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TEST_P(TlsExtensionTestGeneric, AlpnReturnedListTrailingData) {
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EnableAlpn();
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const uint8_t val[] = { 0x00, 0x02, 0x01, 0x61, 0x00 };
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DataBuffer extension(val, sizeof(val));
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ServerHelloErrorTest(new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension));
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}
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TEST_P(TlsExtensionTestGeneric, AlpnReturnedExtraEntry) {
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EnableAlpn();
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const uint8_t val[] = { 0x00, 0x04, 0x01, 0x61, 0x01, 0x62 };
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DataBuffer extension(val, sizeof(val));
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ServerHelloErrorTest(new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension));
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}
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TEST_P(TlsExtensionTestGeneric, AlpnReturnedBadListLength) {
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EnableAlpn();
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const uint8_t val[] = { 0x00, 0x99, 0x01, 0x61, 0x00 };
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DataBuffer extension(val, sizeof(val));
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ServerHelloErrorTest(new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension));
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}
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TEST_P(TlsExtensionTestGeneric, AlpnReturnedBadNameLength) {
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EnableAlpn();
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const uint8_t val[] = { 0x00, 0x02, 0x99, 0x61 };
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DataBuffer extension(val, sizeof(val));
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ServerHelloErrorTest(new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension));
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}
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TEST_P(TlsExtensionTestDtls, SrtpShort) {
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EnableSrtp();
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ClientHelloErrorTest(new TlsExtensionTruncator(ssl_use_srtp_xtn, 3));
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}
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TEST_P(TlsExtensionTestDtls, SrtpOdd) {
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EnableSrtp();
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const uint8_t val[] = { 0x00, 0x01, 0xff, 0x00 };
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DataBuffer extension(val, sizeof(val));
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ClientHelloErrorTest(new TlsExtensionReplacer(ssl_use_srtp_xtn, extension));
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}
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TEST_P(TlsExtensionTest12Plus, SignatureAlgorithmsBadLength) {
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const uint8_t val[] = { 0x00 };
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DataBuffer extension(val, sizeof(val));
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ClientHelloErrorTest(new TlsExtensionReplacer(ssl_signature_algorithms_xtn,
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extension));
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}
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TEST_P(TlsExtensionTest12Plus, SignatureAlgorithmsTrailingData) {
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const uint8_t val[] = { 0x00, 0x02, 0x04, 0x01, 0x00 }; // sha-256, rsa
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DataBuffer extension(val, sizeof(val));
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ClientHelloErrorTest(new TlsExtensionReplacer(ssl_signature_algorithms_xtn,
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extension));
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}
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TEST_P(TlsExtensionTest12Plus, SignatureAlgorithmsEmpty) {
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const uint8_t val[] = { 0x00, 0x00 };
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DataBuffer extension(val, sizeof(val));
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ClientHelloErrorTest(new TlsExtensionReplacer(ssl_signature_algorithms_xtn,
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extension));
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}
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TEST_P(TlsExtensionTest12Plus, SignatureAlgorithmsOddLength) {
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const uint8_t val[] = { 0x00, 0x01, 0x04 };
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DataBuffer extension(val, sizeof(val));
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ClientHelloErrorTest(new TlsExtensionReplacer(ssl_signature_algorithms_xtn,
|
|
extension));
|
|
}
|
|
|
|
// The extension handling ignores unsupported hashes, so breaking that has no
|
|
// effect on success rates. However, ssl3_SendServerKeyExchange catches an
|
|
// unsupported signature algorithm.
|
|
|
|
// This actually fails with a decryption error (fatal alert 51). That's a bad
|
|
// to fail, since any tampering with the handshake will trigger that alert when
|
|
// verifying the Finished message. Thus, this test is disabled until this error
|
|
// is turned into an alert.
|
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TEST_P(TlsExtensionTest12Plus, DISABLED_SignatureAlgorithmsSigUnsupported) {
|
|
const uint8_t val[] = { 0x00, 0x02, 0x04, 0x99 };
|
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DataBuffer extension(val, sizeof(val));
|
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ClientHelloErrorTest(new TlsExtensionReplacer(ssl_signature_algorithms_xtn,
|
|
extension));
|
|
}
|
|
|
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TEST_P(TlsExtensionTestGeneric, SupportedCurvesShort) {
|
|
const uint8_t val[] = { 0x00, 0x01, 0x00 };
|
|
DataBuffer extension(val, sizeof(val));
|
|
ClientHelloErrorTest(new TlsExtensionReplacer(ssl_elliptic_curves_xtn,
|
|
extension));
|
|
}
|
|
|
|
TEST_P(TlsExtensionTestGeneric, SupportedCurvesBadLength) {
|
|
const uint8_t val[] = { 0x09, 0x99, 0x00, 0x00 };
|
|
DataBuffer extension(val, sizeof(val));
|
|
ClientHelloErrorTest(new TlsExtensionReplacer(ssl_elliptic_curves_xtn,
|
|
extension));
|
|
}
|
|
|
|
TEST_P(TlsExtensionTestGeneric, SupportedCurvesTrailingData) {
|
|
const uint8_t val[] = { 0x00, 0x02, 0x00, 0x00, 0x00 };
|
|
DataBuffer extension(val, sizeof(val));
|
|
ClientHelloErrorTest(new TlsExtensionReplacer(ssl_elliptic_curves_xtn,
|
|
extension));
|
|
}
|
|
|
|
TEST_P(TlsExtensionTestGeneric, SupportedPointsEmpty) {
|
|
const uint8_t val[] = { 0x00 };
|
|
DataBuffer extension(val, sizeof(val));
|
|
ClientHelloErrorTest(new TlsExtensionReplacer(ssl_ec_point_formats_xtn,
|
|
extension));
|
|
}
|
|
|
|
TEST_P(TlsExtensionTestGeneric, SupportedPointsBadLength) {
|
|
const uint8_t val[] = { 0x99, 0x00, 0x00 };
|
|
DataBuffer extension(val, sizeof(val));
|
|
ClientHelloErrorTest(new TlsExtensionReplacer(ssl_ec_point_formats_xtn,
|
|
extension));
|
|
}
|
|
|
|
TEST_P(TlsExtensionTestGeneric, SupportedPointsTrailingData) {
|
|
const uint8_t val[] = { 0x01, 0x00, 0x00 };
|
|
DataBuffer extension(val, sizeof(val));
|
|
ClientHelloErrorTest(new TlsExtensionReplacer(ssl_ec_point_formats_xtn,
|
|
extension));
|
|
}
|
|
|
|
TEST_P(TlsExtensionTestGeneric, RenegotiationInfoBadLength) {
|
|
const uint8_t val[] = { 0x99 };
|
|
DataBuffer extension(val, sizeof(val));
|
|
ClientHelloErrorTest(new TlsExtensionReplacer(ssl_renegotiation_info_xtn,
|
|
extension));
|
|
}
|
|
|
|
TEST_P(TlsExtensionTestGeneric, RenegotiationInfoMismatch) {
|
|
const uint8_t val[] = { 0x01, 0x00 };
|
|
DataBuffer extension(val, sizeof(val));
|
|
ClientHelloErrorTest(new TlsExtensionReplacer(ssl_renegotiation_info_xtn,
|
|
extension));
|
|
}
|
|
|
|
// The extension has to contain a length.
|
|
TEST_P(TlsExtensionTestGeneric, RenegotiationInfoExtensionEmpty) {
|
|
DataBuffer extension;
|
|
ClientHelloErrorTest(new TlsExtensionReplacer(ssl_renegotiation_info_xtn,
|
|
extension));
|
|
}
|
|
|
|
TEST_P(TlsExtensionTest12Plus, SignatureAlgorithmConfiguration) {
|
|
const SSLSignatureAndHashAlg algorithms[] = {
|
|
{ssl_hash_sha512, ssl_sign_rsa},
|
|
{ssl_hash_sha384, ssl_sign_ecdsa}
|
|
};
|
|
|
|
TlsExtensionCapture *capture =
|
|
new TlsExtensionCapture(ssl_signature_algorithms_xtn);
|
|
client_->SetSignatureAlgorithms(algorithms, PR_ARRAY_SIZE(algorithms));
|
|
client_->SetPacketFilter(capture);
|
|
DisableDheAndEcdheCiphers();
|
|
Connect();
|
|
|
|
const DataBuffer& ext = capture->extension();
|
|
EXPECT_EQ(2 + PR_ARRAY_SIZE(algorithms) * 2, ext.len());
|
|
for (size_t i = 0, cursor = 2;
|
|
i < PR_ARRAY_SIZE(algorithms) && cursor < ext.len();
|
|
++i) {
|
|
uint32_t v;
|
|
EXPECT_TRUE(ext.Read(cursor++, 1, &v));
|
|
EXPECT_EQ(algorithms[i].hashAlg, static_cast<SSLHashType>(v));
|
|
EXPECT_TRUE(ext.Read(cursor++, 1, &v));
|
|
EXPECT_EQ(algorithms[i].sigAlg, static_cast<SSLSignType>(v));
|
|
}
|
|
}
|
|
|
|
INSTANTIATE_TEST_CASE_P(ExtensionTls10, TlsExtensionTestGeneric,
|
|
::testing::Combine(
|
|
TlsConnectTestBase::kTlsModesStream,
|
|
TlsConnectTestBase::kTlsV10));
|
|
INSTANTIATE_TEST_CASE_P(ExtensionVariants, TlsExtensionTestGeneric,
|
|
::testing::Combine(
|
|
TlsConnectTestBase::kTlsModesAll,
|
|
TlsConnectTestBase::kTlsV11V12));
|
|
INSTANTIATE_TEST_CASE_P(ExtensionTls12Plus, TlsExtensionTest12Plus,
|
|
TlsConnectTestBase::kTlsModesAll);
|
|
INSTANTIATE_TEST_CASE_P(ExtensionDgram, TlsExtensionTestDtls,
|
|
TlsConnectTestBase::kTlsV11V12);
|
|
|
|
} // namespace nspr_test
|