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refactor: prepare unified exec for zsh-fork backend (#13392)
## Why `shell_zsh_fork` already provides stronger guarantees around which executables receive elevated permissions. To reuse that machinery from unified exec without pushing Unix-specific escalation details through generic runtime code, the escalation bootstrap and session lifetime handling need a cleaner boundary. That boundary also needs to be safe for long-lived sessions: when an intercepted shell session is closed or pruned, any in-flight approval workers and any already-approved escalated child they spawned must be torn down with the session, and the inherited escalation socket must not leak into unrelated subprocesses. ## What Changed - Extracted a reusable `EscalationSession` and `EscalateServer::start_session(...)` in `shell-escalation` so callers can get the wrapper/socket env overlay and keep the escalation server alive without immediately running a one-shot command. - Documented that `EscalationSession::env()` and `ShellCommandExecutor::run(...)` exchange only that env overlay, which callers must merge into their own base shell environment. - Clarified the prepared-exec helper boundary in `core` by naming the new helper APIs around `ExecRequest`, while keeping the legacy `execute_env(...)` entrypoints as thin compatibility wrappers for existing callers that still use the older naming. - Added a small post-spawn hook on the prepared execution path so the parent copy of the inheritable escalation socket is closed immediately after both the existing one-shot shell-command spawn and the unified-exec spawn. - Made session teardown explicit with session-scoped cancellation: dropping an `EscalationSession` or canceling its parent request now stops intercept workers, and the server-spawned escalated child uses `kill_on_drop(true)` so teardown cannot orphan an already-approved child. - Added `UnifiedExecBackendConfig` plumbing through `ToolsConfig`, a `shell::zsh_fork_backend` facade, and an opaque unified-exec spawn-lifecycle hook so unified exec can prepare a wrapped `zsh -c/-lc` request without storing `EscalationSession` directly in generic process/runtime code. - Kept the existing `shell_command` zsh-fork behavior intact on top of the new bootstrap path. Tool selection is unchanged in this PR: when `shell_zsh_fork` is enabled, `ShellCommand` still wins over `exec_command`. ## Verification - `cargo test -p codex-shell-escalation` - includes coverage for `start_session_exposes_wrapper_env_overlay` - includes coverage for `exec_closes_parent_socket_after_shell_spawn` - includes coverage for `dropping_session_aborts_intercept_workers_and_kills_spawned_child` - `cargo test -p codex-core shell_zsh_fork_prefers_shell_command_over_unified_exec` - `cargo test -p codex-core --test all shell_zsh_fork_prompts_for_skill_script_execution` --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/openai/codex/pull/13392). * #13432 * __->__ #13392
This commit is contained in:
Michael Bolin
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GitHub
parent
1ce1712aeb
commit
b4cb989563
@@ -5,7 +5,8 @@ Executes shell requests under the orchestrator: asks for approval when needed,
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builds a CommandSpec, and runs it under the current SandboxAttempt.
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*/
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#[cfg(unix)]
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mod unix_escalation;
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pub(crate) mod unix_escalation;
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pub(crate) mod zsh_fork_backend;
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use crate::command_canonicalization::canonicalize_command_for_approval;
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use crate::exec::ExecToolCallOutput;
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@@ -80,7 +81,6 @@ pub(crate) enum ShellRuntimeBackend {
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#[derive(Default)]
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pub struct ShellRuntime {
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#[cfg_attr(not(unix), allow(dead_code))]
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backend: ShellRuntimeBackend,
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}
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@@ -215,9 +215,8 @@ impl ToolRuntime<ShellRequest, ExecToolCallOutput> for ShellRuntime {
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command
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};
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#[cfg(unix)]
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if self.backend == ShellRuntimeBackend::ShellCommandZshFork {
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match unix_escalation::try_run_zsh_fork(req, attempt, ctx, &command).await? {
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match zsh_fork_backend::maybe_run_shell_command(req, attempt, ctx, &command).await? {
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Some(out) => return Ok(out),
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None => {
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tracing::warn!(
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@@ -6,6 +6,7 @@ use crate::exec::ExecToolCallOutput;
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use crate::exec::SandboxType;
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use crate::exec::is_likely_sandbox_denied;
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use crate::features::Feature;
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use crate::sandboxing::ExecRequest;
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use crate::sandboxing::SandboxPermissions;
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use crate::shell::ShellType;
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use crate::skills::SkillMetadata;
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@@ -36,6 +37,7 @@ use codex_shell_escalation::EscalationDecision;
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use codex_shell_escalation::EscalationExecution;
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use codex_shell_escalation::EscalationPermissions;
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use codex_shell_escalation::EscalationPolicy;
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use codex_shell_escalation::EscalationSession;
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use codex_shell_escalation::ExecParams;
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use codex_shell_escalation::ExecResult;
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use codex_shell_escalation::Permissions as EscalatedPermissions;
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@@ -51,6 +53,11 @@ use tokio::sync::RwLock;
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use tokio_util::sync::CancellationToken;
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use uuid::Uuid;
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pub(crate) struct PreparedUnifiedExecZshFork {
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pub(crate) exec_request: ExecRequest,
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pub(crate) escalation_session: EscalationSession,
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}
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pub(super) async fn try_run_zsh_fork(
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req: &ShellRequest,
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attempt: &SandboxAttempt<'_>,
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@@ -95,7 +102,7 @@ pub(super) async fn try_run_zsh_fork(
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justification,
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arg0,
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} = sandbox_exec_request;
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let ParsedShellCommand { script, login } = extract_shell_script(&command)?;
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let ParsedShellCommand { script, login, .. } = extract_shell_script(&command)?;
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let effective_timeout = Duration::from_millis(
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req.timeout_ms
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.unwrap_or(crate::exec::DEFAULT_EXEC_COMMAND_TIMEOUT_MS),
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@@ -172,6 +179,103 @@ pub(super) async fn try_run_zsh_fork(
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map_exec_result(attempt.sandbox, exec_result).map(Some)
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}
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pub(crate) async fn prepare_unified_exec_zsh_fork(
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req: &crate::tools::runtimes::unified_exec::UnifiedExecRequest,
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attempt: &SandboxAttempt<'_>,
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ctx: &ToolCtx,
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exec_request: ExecRequest,
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) -> Result<Option<PreparedUnifiedExecZshFork>, ToolError> {
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let Some(shell_zsh_path) = ctx.session.services.shell_zsh_path.as_ref() else {
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tracing::warn!("ZshFork backend specified, but shell_zsh_path is not configured.");
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return Ok(None);
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};
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if !ctx.session.features().enabled(Feature::ShellZshFork) {
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tracing::warn!("ZshFork backend specified, but ShellZshFork feature is not enabled.");
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return Ok(None);
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}
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if !matches!(ctx.session.user_shell().shell_type, ShellType::Zsh) {
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tracing::warn!("ZshFork backend specified, but user shell is not Zsh.");
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return Ok(None);
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}
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let parsed = match extract_shell_script(&exec_request.command) {
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Ok(parsed) => parsed,
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Err(err) => {
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tracing::warn!("ZshFork unified exec fallback: {err:?}");
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return Ok(None);
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}
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};
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if parsed.program != shell_zsh_path.to_string_lossy() {
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tracing::warn!(
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"ZshFork backend specified, but unified exec command targets `{}` instead of `{}`.",
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parsed.program,
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shell_zsh_path.display(),
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);
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return Ok(None);
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}
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let exec_policy = Arc::new(RwLock::new(
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ctx.session.services.exec_policy.current().as_ref().clone(),
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));
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let command_executor = CoreShellCommandExecutor {
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command: exec_request.command.clone(),
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cwd: exec_request.cwd.clone(),
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sandbox_policy: exec_request.sandbox_policy.clone(),
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sandbox: exec_request.sandbox,
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env: exec_request.env.clone(),
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network: exec_request.network.clone(),
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windows_sandbox_level: exec_request.windows_sandbox_level,
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sandbox_permissions: exec_request.sandbox_permissions,
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justification: exec_request.justification.clone(),
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arg0: exec_request.arg0.clone(),
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sandbox_policy_cwd: ctx.turn.cwd.clone(),
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macos_seatbelt_profile_extensions: ctx
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.turn
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.config
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.permissions
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.macos_seatbelt_profile_extensions
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.clone(),
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codex_linux_sandbox_exe: ctx.turn.codex_linux_sandbox_exe.clone(),
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use_linux_sandbox_bwrap: ctx.turn.features.enabled(Feature::UseLinuxSandboxBwrap),
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};
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let main_execve_wrapper_exe = ctx
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.session
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.services
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.main_execve_wrapper_exe
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.clone()
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.ok_or_else(|| {
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ToolError::Rejected(
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"zsh fork feature enabled, but execve wrapper is not configured".to_string(),
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)
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})?;
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let escalation_policy = CoreShellActionProvider {
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policy: Arc::clone(&exec_policy),
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session: Arc::clone(&ctx.session),
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turn: Arc::clone(&ctx.turn),
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call_id: ctx.call_id.clone(),
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approval_policy: ctx.turn.approval_policy.value(),
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sandbox_policy: attempt.policy.clone(),
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sandbox_permissions: req.sandbox_permissions,
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prompt_permissions: req.additional_permissions.clone(),
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stopwatch: Stopwatch::unlimited(),
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};
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let escalate_server = EscalateServer::new(
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shell_zsh_path.clone(),
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main_execve_wrapper_exe,
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escalation_policy,
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);
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let escalation_session = escalate_server
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.start_session(CancellationToken::new(), Arc::new(command_executor))
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.map_err(|err| ToolError::Rejected(err.to_string()))?;
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let mut exec_request = exec_request;
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exec_request.env.extend(escalation_session.env().clone());
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Ok(Some(PreparedUnifiedExecZshFork {
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exec_request,
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escalation_session,
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}))
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}
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struct CoreShellActionProvider {
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policy: Arc<RwLock<Policy>>,
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session: Arc<crate::codex::Session>,
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@@ -648,17 +752,20 @@ impl ShellCommandExecutor for CoreShellCommandExecutor {
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&self,
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_command: Vec<String>,
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_cwd: PathBuf,
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env: HashMap<String, String>,
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env_overlay: HashMap<String, String>,
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cancel_rx: CancellationToken,
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after_spawn: Option<Box<dyn FnOnce() + Send>>,
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) -> anyhow::Result<ExecResult> {
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let mut exec_env = self.env.clone();
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// `env_overlay` comes from `EscalationSession::env()`, so merge only the
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// wrapper/socket variables into the base shell environment.
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for var in ["CODEX_ESCALATE_SOCKET", "EXEC_WRAPPER", "BASH_EXEC_WRAPPER"] {
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if let Some(value) = env.get(var) {
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if let Some(value) = env_overlay.get(var) {
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exec_env.insert(var.to_string(), value.clone());
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}
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}
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let result = crate::sandboxing::execute_env(
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let result = crate::sandboxing::execute_exec_request_with_after_spawn(
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crate::sandboxing::ExecRequest {
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command: self.command.clone(),
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cwd: self.cwd.clone(),
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@@ -673,6 +780,7 @@ impl ShellCommandExecutor for CoreShellCommandExecutor {
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arg0: self.arg0.clone(),
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},
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None,
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after_spawn,
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)
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.await?;
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@@ -809,6 +917,7 @@ impl CoreShellCommandExecutor {
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#[derive(Debug, Eq, PartialEq)]
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struct ParsedShellCommand {
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program: String,
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script: String,
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login: bool,
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}
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@@ -817,12 +926,20 @@ fn extract_shell_script(command: &[String]) -> Result<ParsedShellCommand, ToolEr
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// Commands reaching zsh-fork can be wrapped by environment/sandbox helpers, so
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// we search for the first `-c`/`-lc` triple anywhere in the argv rather
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// than assuming it is the first positional form.
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if let Some((script, login)) = command.windows(3).find_map(|parts| match parts {
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[_, flag, script] if flag == "-c" => Some((script.to_owned(), false)),
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[_, flag, script] if flag == "-lc" => Some((script.to_owned(), true)),
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if let Some((program, script, login)) = command.windows(3).find_map(|parts| match parts {
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[program, flag, script] if flag == "-c" => {
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Some((program.to_owned(), script.to_owned(), false))
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}
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[program, flag, script] if flag == "-lc" => {
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Some((program.to_owned(), script.to_owned(), true))
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}
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_ => None,
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}) {
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return Ok(ParsedShellCommand { script, login });
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return Ok(ParsedShellCommand {
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program,
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script,
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login,
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});
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}
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Err(ToolError::Rejected(
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@@ -64,6 +64,7 @@ fn extract_shell_script_preserves_login_flag() {
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assert_eq!(
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extract_shell_script(&["/bin/zsh".into(), "-lc".into(), "echo hi".into()]).unwrap(),
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ParsedShellCommand {
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program: "/bin/zsh".to_string(),
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script: "echo hi".to_string(),
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login: true,
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}
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@@ -71,6 +72,7 @@ fn extract_shell_script_preserves_login_flag() {
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assert_eq!(
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extract_shell_script(&["/bin/zsh".into(), "-c".into(), "echo hi".into()]).unwrap(),
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ParsedShellCommand {
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program: "/bin/zsh".to_string(),
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script: "echo hi".to_string(),
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login: false,
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}
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@@ -89,6 +91,7 @@ fn extract_shell_script_supports_wrapped_command_prefixes() {
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])
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.unwrap(),
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ParsedShellCommand {
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program: "/bin/zsh".to_string(),
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script: "echo hello".to_string(),
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login: true,
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}
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@@ -105,6 +108,7 @@ fn extract_shell_script_supports_wrapped_command_prefixes() {
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])
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.unwrap(),
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ParsedShellCommand {
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program: "/bin/zsh".to_string(),
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script: "pwd".to_string(),
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login: false,
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}
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@@ -0,0 +1,115 @@
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use super::ShellRequest;
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use crate::exec::ExecToolCallOutput;
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use crate::sandboxing::ExecRequest;
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use crate::tools::runtimes::unified_exec::UnifiedExecRequest;
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use crate::tools::sandboxing::SandboxAttempt;
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use crate::tools::sandboxing::ToolCtx;
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use crate::tools::sandboxing::ToolError;
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use crate::unified_exec::SpawnLifecycleHandle;
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pub(crate) struct PreparedUnifiedExecSpawn {
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pub(crate) exec_request: ExecRequest,
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pub(crate) spawn_lifecycle: SpawnLifecycleHandle,
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}
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/// Runs the zsh-fork shell-command backend when this request should be handled
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/// by executable-level escalation instead of the default shell runtime.
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///
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/// Returns `Ok(None)` when the current platform or request shape should fall
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/// back to the normal shell-command path.
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pub(crate) async fn maybe_run_shell_command(
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req: &ShellRequest,
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attempt: &SandboxAttempt<'_>,
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ctx: &ToolCtx,
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command: &[String],
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) -> Result<Option<ExecToolCallOutput>, ToolError> {
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imp::maybe_run_shell_command(req, attempt, ctx, command).await
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}
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/// Prepares unified exec to launch through the zsh-fork backend when the
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/// request matches a wrapped `zsh -c/-lc` command on a supported platform.
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///
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/// Returns the transformed `ExecRequest` plus a spawn lifecycle that keeps the
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/// escalation server alive for the session and performs post-spawn cleanup.
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/// Returns `Ok(None)` when unified exec should use its normal spawn path.
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pub(crate) async fn maybe_prepare_unified_exec(
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req: &UnifiedExecRequest,
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attempt: &SandboxAttempt<'_>,
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ctx: &ToolCtx,
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exec_request: ExecRequest,
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) -> Result<Option<PreparedUnifiedExecSpawn>, ToolError> {
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imp::maybe_prepare_unified_exec(req, attempt, ctx, exec_request).await
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}
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#[cfg(unix)]
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mod imp {
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use super::*;
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use crate::tools::runtimes::shell::unix_escalation;
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use crate::unified_exec::SpawnLifecycle;
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use codex_shell_escalation::EscalationSession;
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#[derive(Debug)]
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struct ZshForkSpawnLifecycle {
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escalation_session: EscalationSession,
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}
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impl SpawnLifecycle for ZshForkSpawnLifecycle {
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fn after_spawn(&mut self) {
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self.escalation_session.close_client_socket();
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}
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}
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pub(super) async fn maybe_run_shell_command(
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req: &ShellRequest,
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attempt: &SandboxAttempt<'_>,
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ctx: &ToolCtx,
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command: &[String],
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) -> Result<Option<ExecToolCallOutput>, ToolError> {
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unix_escalation::try_run_zsh_fork(req, attempt, ctx, command).await
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}
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pub(super) async fn maybe_prepare_unified_exec(
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req: &UnifiedExecRequest,
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attempt: &SandboxAttempt<'_>,
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ctx: &ToolCtx,
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exec_request: ExecRequest,
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) -> Result<Option<PreparedUnifiedExecSpawn>, ToolError> {
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let Some(prepared) =
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unix_escalation::prepare_unified_exec_zsh_fork(req, attempt, ctx, exec_request).await?
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else {
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return Ok(None);
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};
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Ok(Some(PreparedUnifiedExecSpawn {
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exec_request: prepared.exec_request,
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spawn_lifecycle: Box::new(ZshForkSpawnLifecycle {
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escalation_session: prepared.escalation_session,
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}),
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}))
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}
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}
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#[cfg(not(unix))]
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mod imp {
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use super::*;
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pub(super) async fn maybe_run_shell_command(
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req: &ShellRequest,
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attempt: &SandboxAttempt<'_>,
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ctx: &ToolCtx,
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command: &[String],
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) -> Result<Option<ExecToolCallOutput>, ToolError> {
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let _ = (req, attempt, ctx, command);
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Ok(None)
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}
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pub(super) async fn maybe_prepare_unified_exec(
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req: &UnifiedExecRequest,
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attempt: &SandboxAttempt<'_>,
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ctx: &ToolCtx,
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exec_request: ExecRequest,
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) -> Result<Option<PreparedUnifiedExecSpawn>, ToolError> {
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let _ = (req, attempt, ctx, exec_request);
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Ok(None)
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}
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}
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@@ -16,6 +16,7 @@ use crate::tools::network_approval::NetworkApprovalMode;
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use crate::tools::network_approval::NetworkApprovalSpec;
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use crate::tools::runtimes::build_command_spec;
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use crate::tools::runtimes::maybe_wrap_shell_lc_with_snapshot;
|
||||
use crate::tools::runtimes::shell::zsh_fork_backend;
|
||||
use crate::tools::sandboxing::Approvable;
|
||||
use crate::tools::sandboxing::ApprovalCtx;
|
||||
use crate::tools::sandboxing::ExecApprovalRequirement;
|
||||
@@ -28,6 +29,8 @@ use crate::tools::sandboxing::ToolError;
|
||||
use crate::tools::sandboxing::ToolRuntime;
|
||||
use crate::tools::sandboxing::sandbox_override_for_first_attempt;
|
||||
use crate::tools::sandboxing::with_cached_approval;
|
||||
use crate::tools::spec::UnifiedExecBackendConfig;
|
||||
use crate::unified_exec::NoopSpawnLifecycle;
|
||||
use crate::unified_exec::UnifiedExecError;
|
||||
use crate::unified_exec::UnifiedExecProcess;
|
||||
use crate::unified_exec::UnifiedExecProcessManager;
|
||||
@@ -63,11 +66,12 @@ pub struct UnifiedExecApprovalKey {
|
||||
|
||||
pub struct UnifiedExecRuntime<'a> {
|
||||
manager: &'a UnifiedExecProcessManager,
|
||||
backend: UnifiedExecBackendConfig,
|
||||
}
|
||||
|
||||
impl<'a> UnifiedExecRuntime<'a> {
|
||||
pub fn new(manager: &'a UnifiedExecProcessManager) -> Self {
|
||||
Self { manager }
|
||||
pub fn new(manager: &'a UnifiedExecProcessManager, backend: UnifiedExecBackendConfig) -> Self {
|
||||
Self { manager, backend }
|
||||
}
|
||||
}
|
||||
|
||||
@@ -184,6 +188,47 @@ impl<'a> ToolRuntime<UnifiedExecRequest, UnifiedExecProcess> for UnifiedExecRunt
|
||||
if let Some(network) = req.network.as_ref() {
|
||||
network.apply_to_env(&mut env);
|
||||
}
|
||||
if self.backend == UnifiedExecBackendConfig::ZshFork {
|
||||
let spec = build_command_spec(
|
||||
&command,
|
||||
&req.cwd,
|
||||
&env,
|
||||
ExecExpiration::DefaultTimeout,
|
||||
req.sandbox_permissions,
|
||||
req.additional_permissions.clone(),
|
||||
req.justification.clone(),
|
||||
)
|
||||
.map_err(|_| ToolError::Rejected("missing command line for PTY".to_string()))?;
|
||||
let exec_env = attempt
|
||||
.env_for(spec, req.network.as_ref())
|
||||
.map_err(|err| ToolError::Codex(err.into()))?;
|
||||
match zsh_fork_backend::maybe_prepare_unified_exec(req, attempt, ctx, exec_env).await? {
|
||||
Some(prepared) => {
|
||||
return self
|
||||
.manager
|
||||
.open_session_with_exec_env(
|
||||
&prepared.exec_request,
|
||||
req.tty,
|
||||
prepared.spawn_lifecycle,
|
||||
)
|
||||
.await
|
||||
.map_err(|err| match err {
|
||||
UnifiedExecError::SandboxDenied { output, .. } => {
|
||||
ToolError::Codex(CodexErr::Sandbox(SandboxErr::Denied {
|
||||
output: Box::new(output),
|
||||
network_policy_decision: None,
|
||||
}))
|
||||
}
|
||||
other => ToolError::Rejected(other.to_string()),
|
||||
});
|
||||
}
|
||||
None => {
|
||||
tracing::warn!(
|
||||
"UnifiedExec ZshFork backend specified, but conditions for using it were not met, falling back to direct execution",
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
let spec = build_command_spec(
|
||||
&command,
|
||||
&req.cwd,
|
||||
@@ -198,7 +243,7 @@ impl<'a> ToolRuntime<UnifiedExecRequest, UnifiedExecProcess> for UnifiedExecRunt
|
||||
.env_for(spec, req.network.as_ref())
|
||||
.map_err(|err| ToolError::Codex(err.into()))?;
|
||||
self.manager
|
||||
.open_session_with_exec_env(&exec_env, req.tty)
|
||||
.open_session_with_exec_env(&exec_env, req.tty, Box::new(NoopSpawnLifecycle))
|
||||
.await
|
||||
.map_err(|err| match err {
|
||||
UnifiedExecError::SandboxDenied { output, .. } => {
|
||||
|
||||
@@ -44,10 +44,17 @@ pub enum ShellCommandBackendConfig {
|
||||
ZshFork,
|
||||
}
|
||||
|
||||
#[derive(Debug, Clone, Copy, Eq, PartialEq)]
|
||||
pub enum UnifiedExecBackendConfig {
|
||||
Direct,
|
||||
ZshFork,
|
||||
}
|
||||
|
||||
#[derive(Debug, Clone)]
|
||||
pub(crate) struct ToolsConfig {
|
||||
pub shell_type: ConfigShellToolType,
|
||||
shell_command_backend: ShellCommandBackendConfig,
|
||||
pub unified_exec_backend: UnifiedExecBackendConfig,
|
||||
pub allow_login_shell: bool,
|
||||
pub apply_patch_tool_type: Option<ApplyPatchToolType>,
|
||||
pub web_search_mode: Option<WebSearchMode>,
|
||||
@@ -102,6 +109,12 @@ impl ToolsConfig {
|
||||
} else {
|
||||
ShellCommandBackendConfig::Classic
|
||||
};
|
||||
let unified_exec_backend =
|
||||
if features.enabled(Feature::ShellTool) && features.enabled(Feature::ShellZshFork) {
|
||||
UnifiedExecBackendConfig::ZshFork
|
||||
} else {
|
||||
UnifiedExecBackendConfig::Direct
|
||||
};
|
||||
|
||||
let shell_type = if !features.enabled(Feature::ShellTool) {
|
||||
ConfigShellToolType::Disabled
|
||||
@@ -140,6 +153,7 @@ impl ToolsConfig {
|
||||
Self {
|
||||
shell_type,
|
||||
shell_command_backend,
|
||||
unified_exec_backend,
|
||||
allow_login_shell: true,
|
||||
apply_patch_tool_type,
|
||||
web_search_mode: *web_search_mode,
|
||||
@@ -2817,6 +2831,10 @@ mod tests {
|
||||
tools_config.shell_command_backend,
|
||||
ShellCommandBackendConfig::ZshFork
|
||||
);
|
||||
assert_eq!(
|
||||
tools_config.unified_exec_backend,
|
||||
UnifiedExecBackendConfig::ZshFork
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
|
||||
Reference in New Issue
Block a user