## Why
Linux proxy-routed sandboxing denied standalone Unix sockets even when the effective network policy enabled `dangerously_allow_all_unix_sockets`.
## What changed
- Carry Unix socket permissions in `ManagedNetworkSandboxContext` and pass the prepared context through Linux sandbox launches with `--managed-network`.
- Allow `AF_UNIX` socket creation in proxy-routed mode when `dangerously_allow_all_unix_sockets` is enabled, while preserving network namespace isolation and restrictions on other socket families.
- Keep standalone Unix sockets denied by default and for path-only grants. Default missing fields in older serialized contexts to restrictive values.
## Testing
Add coverage for policy preparation and transport, legacy deserialization, and malformed policy rejection. Add a Linux integration test covering default denial, path-only denial, and explicit allow-all access, while checking that direct TCP access and `AF_NETLINK`/`AF_VSOCK` sockets remain blocked.
GitOrigin-RevId: 2695b945ad3e59fcb3faf7662d852a26650af16c
## What changed
- Add explicit MXC backend selection and carry its identity through exec-server process reporting and sandbox violation classification.
- Launch MXC through the Codex executable with the effective permission profile and command environment.
- Reject exec-server MXC requests when native MXC is unavailable or when they request a TTY, an `arg0` override, or managed networking. Reject private desktop isolation during MXC preparation.
- Allow an explicitly empty child environment and avoid exposing request payload values in launcher decode errors.
## Testing
Add coverage for sandbox selection and unsupported-request rejection, plus Windows RPC tests for stdin writes and temporary-directory permissions derived from the command environment. Native MXC tests skip when MXC is unavailable.
GitOrigin-RevId: 3626ff0f9ad7f9b812ce09b68c31ea9a5a9c72b1
## What changed
- Dispatch `--__codex-windows-mxc` before normal CLI parsing, launch the decoded request, and propagate the child exit code.
- Build the native request from the helper's environment and working directory, discovered Windows platform directories, and volume roots, including UNC working-directory roots. Reject non-Unicode environment values and empty child environments.
- Allow Win32k calls and desktop handles needed for PowerShell startup while retaining clipboard, input-injection, and desktop/system-control restrictions.
- Keep policy, transport, and native launch internals private, and report an explicit error when the helper is invoked outside Windows.
## Testing
Add a wrapper regression test covering exact argument preservation, Windows quoting, separate policy and command working directories, and explicit environment forwarding.
GitOrigin-RevId: 674d0d61a3265bd517b77da9f9de2cd9fad62917
## What changed
Add `create_command_args()` to encode argv, permissions, policy cwd, and optional managed network context through the existing bounded environment transport.
For managed networking, generate a policy that allows IPv4 and IPv6 loopback while denying direct non-loopback egress and general inbound access. Require nonempty, nonzero proxy ports and reject `allow_local_binding=false` at both launcher and policy boundaries because native host-loopback access is bidirectional.
Document the MXC launch contract, platform requirements, and limitations.
## Testing
Add portable tests covering managed network transport and policy translation, plus rejection of missing proxy ports, zero ports, and unsupported local-binding restrictions at both boundaries.
GitOrigin-RevId: 8d31b98f94a2ba3769369aa50de8e53dc143bac4
## Why
Sandbox policies can exceed Windows command-line limits. Provide an environment transport for these larger MXC launch requests.
## What changed
- Make `MxcCommand` serializable and add JSON encoding and decoding through `CODEX_MXC_LAUNCH_*` environment variables.
- Split payloads into UTF-8-safe chunks of at most 4,096 bytes, with a 1,000,000-byte payload limit and at most 256 chunks.
- Reject malformed or duplicate transport entries and remove all transport variables during decoding, including on failure. Preserve unrelated environment variables.
## Testing
Add tests for large Unicode and escaped-argument round trips, stale variable removal, malformed transport rejection and cleanup, and oversized payload rejection without modifying the environment.
GitOrigin-RevId: 0e5ae2535ef313985a95eb8a5fd4884974dfb1eb
## Why
MXC rejected symbolic temporary-directory and minimal filesystem entries, preventing policies using them from reaching execution.
## What changed
- Resolve `Tmpdir` entries from absolute `TEMP` and `TMP` paths in the filtered command environment, matching variable names case-insensitively.
- Ignore `SlashTmp` entries because `/tmp` has no special meaning on the Windows executor.
- Include platform read roots when the policy requests platform defaults, preserving explicit denies.
## Testing
Add coverage for temporary paths and invalid environment values, optional platform roots, explicit denies, empty commands, and Windows case-insensitive read/write overrides.
GitOrigin-RevId: feb69157ff35bcf648fa0ed0e7d4376818bc1941
## Why
MXC rejected filesystem policies containing `:root` or granting full disk write access, preventing these policies from being translated into native grants.
## What changed
- Resolve `:root` against every executor volume before applying permission precedence and read-only carveouts.
- Grant full disk write access across enumerated volumes while preserving explicit writable paths outside them, such as unmapped shares.
- Treat a `:root` deny as the default so narrower explicit grants survive, while retaining explicit path denies.
- Continue rejecting unsupported symbolic paths with a more specific error.
## Testing
Add regression tests for precedence across drives and working directories, volume grant expansion, explicit grants outside enumerated volumes, root denies with narrower grants, and restrictions on one volume preserving grants on another.
GitOrigin-RevId: 94c9fec9e6429913714ebbdeca382c4f1624b5a2
## Why
MXC volume-root grants are nonrecursive, and filesystem deny globs were rejected before launch.
## What changed
- Expand volume-root grants to include existing immediate children, preserving read-only carveouts and denies. Children created directly under a volume root after policy construction are not granted access.
- Normalize filesystem object aliases before and after expansion so generated grants preserve tighter access restrictions.
- Skip unavailable volumes and uninspectable generated children.
- Resolve deny globs into concrete file and directory paths using the Windows sandbox resolver.
## Testing
Add regression tests for read-only children and aliases, normalized root access, uninspectable children, and deny glob expansion alongside explicit denies.
GitOrigin-RevId: 3242e9a30d16581d6fe5b7b6e39e0e0f71ca6ef4
## What changed
Add `policy::build_request` to `codex-rs/mxc-sandbox` to translate `MxcCommand` permissions into native MXC execution requests. Preserve filesystem denies, read-only carveouts, and protected metadata paths, and resolve overlapping grants using canonical path identities.
Map network permissions to ingress, egress, and loopback policies; quote arguments for Windows process creation; and disable DACL mutation fallback. Reject unsupported symbolic roots and deny globs, empty commands, relative working directories, and non-Unicode request paths.
## Testing
Enable unit tests and add coverage for filesystem grants and carveouts, disabled DACL mutation, deny-glob rejection, relative working directories, and non-Unicode paths.
GitOrigin-RevId: 3e647ed5fa932ab9d528eb44a49dd9283ef50481
## What changed
- Add `codex-mxc-sandbox` with native MXC availability detection and a launcher that inherits standard I/O and waits for the sandboxed process.
- Reject unsupported learning-mode and fallback policies, and verify deny-path support before launch.
- Route the existing Windows MXC availability metric through the new crate and move its Windows linking dependencies alongside the adapter.
GitOrigin-RevId: e2a220b85718e00b0e710c30bbe66b6c56958176
