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A collection of security, correctness, and robustness fixes in `zenhttp` and `zencore` surfaced by security review. Most items are small, independent commits grouped here because they all tighten trust boundaries or fix UB along the same code paths.
## WebSocket protocol hardening (RFC 6455)
- **Enforce the client-side mask bit**. Server-side frame loops now reject unmasked frames with close code 1002 per §5.1. Prevents HTTP intermediary smuggling.
- **Validate control frames and RSV bits**. Fragmented control frames, oversized (>125 B) control payloads, and any non-zero RSV bit now fail the connection before allocation.
- **Lower per-frame payload cap** from 256 MB → 4 MB. Bounds per-connection accumulator memory.
- **Implement message fragmentation**. Continuation frames are coalesced and delivered as a single message; interleaved non-control frames close with 1002; assembled messages are capped at 4 MB (1009 on overflow). Previously partial fragments were delivered to handlers, bypassing payload validation.
- **Parse the 101 handshake response properly** in `HttpWsClient`. Status-line, `Upgrade`, `Connection`, and `Sec-WebSocket-Accept` are now matched exactly rather than via substring searches against the full body.
## Auth / OIDC hardening
- **Constant-time password compare** in `PasswordSecurity::IsAllowed` (closes a remote length/content timing oracle). Adds a shared `ConstantTimeEquals` helper.
- **Harden Basic-auth header parsing**: trim trailing LWS, reject control bytes and DEL in the credential.
- **OIDC discovery pinning**: require HTTPS (loopback exempt), verify `issuer` matches `BaseUrl`, require `token_endpoint` / `userinfo_endpoint` / `jwks_uri` to share origin with `BaseUrl`, reject empty `token_endpoint`.
- **Restrict `POST /auth/oidc/refreshtoken`** to local-machine requests. Previously unauthenticated in default deployments — remote callers could evict or replace cached tokens.
- **Stop logging OIDC provider response bodies** on refresh failure (IdPs echo `refresh_token` back in error bodies).
- **Drop the unused `IdentityToken` field** from `OidcClient` / `OpenIdToken` so nothing in the tree accidentally trusts an unverified JWT.
## Auth state encryption migration
- Add `AesGcm` AEAD primitive (BCrypt / OpenSSL backends, mbedTLS stubbed) and `CryptoRandom::Fill` CSPRNG helper in `zencore/crypto.h`.
- Migrate authstate file from AES-256-CBC with a fixed IV to AES-GCM with a fresh 12-byte random nonce per write and the 4-byte `ZEN1` magic bound as AAD. Legacy-CBC files are transparently read once and rewritten in the new format.
## Filesystem / IO robustness
- `IoBufferExtendedCore::Materialize` now checks `MAP_FAILED` on POSIX (was comparing to `nullptr`, which let the failure sentinel propagate into later reads and `munmap(MAP_FAILED, ...)`).
- `IoBufferBuilder::MakeFromFile / MakeFromTemporaryFile`: close the FD/HANDLE on exception via a dismissable `ScopeGuard`; actually check the `fstat()` return value (previously used an uninitialized `FileSize`).
- `ReadFromFileMaybe`: loop short reads, retry `EINTR`, chunk Windows `ReadFile` at `0xFFFFFFFF` bytes (fixes silent truncation of multi-GiB reads).
- `WipeDirectory`: compare `FindFirstFileW` handle against `INVALID_HANDLE_VALUE` rather than `nullptr`.
- `RemoveFileNative` (Linux/macOS): report non-`ENOENT` stat failures via the `std::error_code` out-param and stop reading `st_mode` after a failed stat.
## Buffer / compression correctness
- Avoid per-copy `IoBufferCore` heap allocations in `CompositeBuffer::CopyTo / ViewOrCopyRange` iterators; add fast path for `BufferHeader::Read` when the 64-byte header fits in the first plain-memory segment.
- `BufferHeader`: add `IsHeaderValid()` gate covering `BlockSizeExponent` range, `BlockCount * BlockSize` overflow, and `TotalRawSize` bounds before any arithmetic uses them. Defends against attacker-controlled headers that can pass the CRC and trigger OOB writes in `DecompressBlock`.
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* Claude config updates
* Bug fixes and hardening across `zencore` and `zenhttp`, identified via static analysis.
### zencore
- **`ZEN_ASSERT` macro** -- extended to accept an optional string message literal; added `ZEN_ASSERT_MSG_` helper for message formatting. Callers needing runtime fmt-style formatting should use `ZEN_ASSERT_FORMAT`.
- **`MpscQueue`** -- fixed `TypeCompatibleStorage` to use a properly-sized `char Storage[sizeof(T)]` array instead of a single `char`; corrected `Data()` to cast `&Storage` rather than `this`; switched cache-line alignment to a fixed constant to avoid GCC's `-Winterference-size` warning. Enabled previously-disabled tests.
- **`StringBuilderImpl`** -- initialized `m_Base`/`m_CurPos`/`m_End` to `nullptr`. Fixed `StringCompare` return type (`bool` -> `int`). Fixed `ParseInt` to reject strings with trailing non-numeric characters. Removed deprecated `<codecvt>` include.
- **`NiceNumGeneral`** -- replaced `powl()` with integer `IntPow()` to avoid floating-point precision issues.
- **`RwLock::ExclusiveLockScope`** -- added move constructor/assignment; initialized `m_Lock` to `nullptr`.
- **`Latch::AddCount`** -- fixed variable type (`std::atomic_ptrdiff_t` -> `std::ptrdiff_t` for the return value of `fetch_add`).
- **`thread.cpp`** -- fixed Linux `pthread_setname_np` 16-byte name truncation; added null check before dereferencing in `Event::Close()`; fixed `NamedEvent::Close()` to call `close(Fd)` outside the lock region; added null guard in `NamedMutex` destructor; `Sleep()` now returns early for non-positive durations.
- **`MD5Stream`** -- was entirely stubbed out (no-op); now correctly calls `MD5Init`/`MD5Update`/`MD5Final`. Fixed `ToHexString` to use the correct string length. Fixed forward declarations. Fixed tests to compare `compare() == 0`.
- **`sentryintegration.cpp`** -- guard against null `filename`/`funcname` in spdlog message handler to prevent a crash in `fmt::format`.
- **`jobqueue.cpp`** -- fixed lost job ID when `IdGenerator` wraps around zero; fixed raw `Job*` in `RunningJobs` map (potential use-after-free) to `RefPtr<Job>`; fixed range-loop copies; fixed format string typo.
- **`trace.cpp`** -- suppress GCC false-positive warnings in third-party `trace.h` include.
### zenhttp
- **WebSocket close race** (`wsasio`, `wshttpsys`, `httpwsclient`) -- `m_CloseSent` promoted from `bool` to `std::atomic<bool>`; close check changed to `exchange(true)` to eliminate the check-then-set data race.
- **`wsframecodec.cpp`** -- reject WebSocket frames with payload > 256 MB to prevent OOM from malformed/malicious frames.
- **`oidc.cpp`** -- URL-encode refresh token and client ID in token requests (`FormUrlEncode`); parse `end_session_endpoint` and `device_authorization_endpoint` from OIDC discovery document.
- **`httpclientcommon.cpp`** -- propagate error code from `AppendData` when flushing the cache buffer.
- **`httpclient.h`** -- initialize all uninitialized members (`ErrorCode`, `UploadedBytes`, `DownloadedBytes`, `ElapsedSeconds`, `MultipartBoundary` fields).
- **`httpserver.h`** -- fix `operator=` return type for `HttpRpcHandler` (missing `&`).
- **`packageformat.h`** -- fix `~0u` (32-bit truncation) to `~uint64_t(0)` for a `uint64_t` field.
- **`httpparser`** -- initialize `m_RequestVerb` in both declaration and `ResetState()`.
- **`httpplugin.cpp`** -- initialize `m_BasePort`; fix format string missing quotes around connection name.
- **`httptracer.h`** -- move `#pragma once` before includes.
- **`websocket.h`** -- initialize `WebSocketMessage::Opcode`.
### zenserver
- **`hubservice.cpp`** -- fix two `ZEN_ASSERT` calls that incorrectly used fmt-style format args; converted to `ZEN_ASSERT_FORMAT`.
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