This commit introduces the `into_inner_with_pending_plaintext` method to the `FakeTlsReader` struct. This method allows users to extract the underlying reader along with any pending plaintext data that may have been buffered during the TLS reading process. The method handles the state transition and ensures that any buffered data is returned as a vector, facilitating easier management of plaintext data in TLS streams.
Исправлена критическая логическая ошибка в цепочке Fake TLS -> MTProto.
Ранее при валидном TLS-хендшейке, но неверном MTProto-пакете, прокси
ошибочно передавал в маскирующий релей обернутый (FakeTls) поток.
Теперь транспорт корректно разворачивается (unwrap) до сырого сокета
через .into_inner(), обеспечивая полную прозрачность (wire-transparency)
для DPI и маскирующего бэкенда.
Security & Hardening:
- Логика приведена в соответствие с требованиями OWASP ASVS L2 (V5: Validation, Sanitization and Encoding).
- Реализовано поведение "fail-closed": при любой ошибке верификации прокси мимикрирует под обычный веб-сервер, не раскрывая своей роли.
- Улучшена диагностика и логирование состояний аутентификации для защиты от активного пробинга.
Adversarial Testing (Black-hat mindset):
- Добавлен отдельный пакет `client_tls_mtproto_fallback_security_tests.rs` (18+ тестов).
- Покрыты сценарии: хаос-фрагментация (побайтовая нарезка TLS-записей), record-splitting,
half-close состояния, сбросы бэкенда и replay-pressure.
- В `client_adversarial_tests.rs` добавлено 10+ тестов на "злые" гонки (race conditions),
утечки лимитов по IP и проверку изоляции состояний параллельных сессий.
- Все 832 теста проходят (passed) в locked-режиме.
- Introduced a new test module for middle relay idle policy security tests, covering various scenarios including soft mark, hard close, and grace periods.
- Implemented functions to create crypto readers and encrypt data for testing.
- Enhanced the Stats struct to include counters for relay idle soft marks, hard closes, pressure evictions, and protocol desync closes.
- Added corresponding increment and retrieval methods for the new stats fields.
- Implement a test to ensure that exceeding the user connection limit does not leak the current connections counter.
- Add tests for direct relay connection refusal and adversarial scenarios to verify proper error handling.
- Introduce fuzz testing for MTProto handshake to ensure robustness against malformed inputs and replay attacks.
- Remove obsolete short TLS probe throttle tests and integrate their functionality into existing security tests.
- Enhance middle relay tests to validate behavior during connection drops and cutovers, ensuring graceful error handling.
- Add a test for half-close scenarios in relay to confirm bidirectional data flow continues as expected.
- Introduced `client_adversarial_tests.rs` to stress test connection limits and IP tracker race conditions.
- Added `handshake_adversarial_tests.rs` for mutational bit-flipping tests and timing neutrality checks.
- Created `masking_adversarial_tests.rs` to validate probing indistinguishability and SSRF prevention.
- Implemented `relay_adversarial_tests.rs` to ensure HOL blocking prevention and data quota enforcement.
- Updated respective modules to include new test paths.
- Adjusted QUOTA_USER_LOCKS_MAX based on test and non-test configurations to improve flexibility.
- Implemented logic to retain existing locks when the maximum quota is reached, ensuring efficient memory usage.
- Added comprehensive tests for quota user lock functionality, including cache reuse, saturation behavior, and race conditions.
- Enhanced StatsIo struct to manage wake scheduling for read and write operations, preventing unnecessary self-wakes.
- Introduced separate replay checker domains for handshake and TLS to ensure isolation and prevent cross-pollution of keys.
- Added security tests for replay checker to validate domain separation and window clamping behavior.
- Modified `build_emulated_server_hello` to accept ALPN (Application-Layer Protocol Negotiation) as an optional parameter, allowing for the embedding of ALPN markers in the application data payload.
- Implemented logic to handle oversized ALPN values and ensure they do not interfere with the application data payload.
- Added new security tests in `emulator_security_tests.rs` to validate the behavior of the ALPN embedding, including scenarios for oversized ALPN and preference for certificate payloads over ALPN markers.
- Introduced `send_adversarial_tests.rs` to cover edge cases and potential issues in the middle proxy's send functionality, ensuring robustness against various failure modes.
- Updated `middle_proxy` module to include new test modules and ensure proper handling of writer commands during data transmission.
- Updated `direct_relay_security_tests.rs` to ensure sanitized paths are correctly validated against resolved paths.
- Added tests for symlink handling in `unknown_dc_log_path_revalidation` to prevent symlink target escape vulnerabilities.
- Modified `handshake.rs` to use a more robust hashing strategy for eviction offsets, improving the eviction logic in `auth_probe_record_failure_with_state`.
- Introduced new tests in `handshake_security_tests.rs` to validate eviction logic under various conditions, ensuring low fail streak entries are prioritized for eviction.
- Simplified `route_mode.rs` by removing unnecessary atomic mode tracking, streamlining the transition logic in `RouteRuntimeController`.
- Enhanced `route_mode_security_tests.rs` with comprehensive tests for mode transitions and their effects on session states, ensuring consistency under concurrent modifications.
- Cleaned up `emulator.rs` by removing unused ALPN extension handling, improving code clarity and maintainability.
- Simplified eviction candidate selection in `auth_probe_record_failure_with_state` by tracking the oldest candidate directly.
- Enhanced the handling of stale entries to ensure newcomers are tracked even under capacity constraints.
- Added tests to verify behavior under stress conditions and ensure newcomers are correctly managed.
- Updated `decode_user_secrets` to prioritize preferred users based on SNI hints.
- Introduced new tests for TLS SNI handling and replay protection mechanisms.
- Improved deduplication hash stability and collision resistance in middle relay logic.
- Refined cutover handling in route mode to ensure consistent error messaging and session management.
- Introduced `copy_with_idle_timeout` function to handle reading and writing with an idle timeout.
- Updated the proxy masking logic to use the new idle timeout function.
- Added tests to verify that idle relays are closed by the idle timeout before the global relay timeout.
- Ensured that connect refusal paths respect the masking budget and that responses followed by silence are cut off by the idle timeout.
- Added tests for adversarial scenarios where clients may attempt to drip-feed data beyond the idle timeout.
- Introduced adversarial tests to validate the behavior of the health monitoring system under various conditions, including the management of draining writers.
- Implemented integration tests to ensure the health monitor correctly handles expired and empty draining writers.
- Added regression tests to verify the functionality of the draining writers' cleanup process, ensuring it adheres to the defined thresholds and budgets.
- Updated the module structure to include the new test files for better organization and maintainability.
