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fix(worker): replace script -qfc with pty-process for injection-safe PTY (#1678)

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- Add pty-process crate (MIT, tokio async support) for PTY allocation
- Spawn claude CLI with pty-process::Command::arg() chaining instead of
  building a shell string for script -qfc
- Eliminates all shell injection surfaces: prompt, model, session_id
  are passed via execve, never interpreted by a shell
- Keep stderr on separate pipe to prevent NDJSON parse breakage
  (pty-process attaches PTY to all fds by default)
- Gate PTY behind #[cfg(unix)] with direct-spawn fallback for Windows CI
- Read stdout from PTY master (implements tokio::io::AsyncRead)
- Add regression tests: arg vector construction + PTY allocation

Addresses review feedback from zmanian and gemini-code-assist.

Co-authored-by: j-bloggs <[email protected]>
Co-authored-by: Claude Opus 4.6 (1M context) <[email protected]>
This commit is contained in:
Joseph Bloggs
2026-03-28 16:31:49 +01:00
committed by GitHub
co-authored by j-bloggs Claude Opus 4.6
parent 9ce3a9fc53
commit de5a1c7b0d
3 changed files with 164 additions and 41 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Cargo.lock
Generated
+16 -5
View File
@@ -3150,7 +3150,7 @@ dependencies = [
"libc",
"percent-encoding",
"pin-project-lite",
"socket2 0.5.10",
"socket2 0.6.3",
"system-configuration",
"tokio",
"tower-service",
@@ -3439,6 +3439,7 @@ dependencies = [
"pgvector",
"postgres-types",
"pretty_assertions",
"pty-process",
"rand 0.8.5",
"readabilityrs",
"refinery",
@@ -3524,7 +3525,7 @@ checksum = "3640c1c38b8e4e43584d8df18be5fc6b0aa314ce6ebf51b53313d4306cca8e46"
dependencies = [
"hermit-abi",
"libc",
"windows-sys 0.59.0",
"windows-sys 0.61.2",
]
[[package]]
@@ -4906,6 +4907,16 @@ dependencies = [
"syn 1.0.109",
]
[[package]]
name = "pty-process"
version = "0.5.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "71cec9e2670207c5ebb9e477763c74436af3b9091dd550b9fb3c1bec7f3ea266"
dependencies = [
"rustix 1.1.4",
"tokio",
]
[[package]]
name = "pulley-interpreter"
version = "28.0.1"
@@ -4930,7 +4941,7 @@ dependencies = [
"quinn-udp",
"rustc-hash 2.1.1",
"rustls 0.23.37",
"socket2 0.5.10",
"socket2 0.6.3",
"thiserror 2.0.18",
"tokio",
"tracing",
@@ -4967,9 +4978,9 @@ dependencies = [
"cfg_aliases",
"libc",
"once_cell",
"socket2 0.5.10",
"socket2 0.6.3",
"tracing",
"windows-sys 0.59.0",
"windows-sys 0.60.2",
]
[[package]]
Cargo.toml
+4
View File
@@ -189,6 +189,10 @@ json5 = { version = "0.4", optional = true }
[target.'cfg(target_os = "macos")'.dependencies]
security-framework = "3"
# PTY allocation for Claude CLI stdout buffering fix (Unix only)
[target.'cfg(unix)'.dependencies]
pty-process = { version = "0.5", features = ["async"] }
# Linux secret-service (GNOME Keyring, KWallet)
[target.'cfg(target_os = "linux")'.dependencies]
secret-service = { version = "4", features = ["rt-tokio-crypto-rust"] }
src/worker/claude_bridge.rs
+128 -20
View File
@@ -31,6 +31,7 @@ use std::time::Duration;
use serde::{Deserialize, Serialize};
use tokio::io::{AsyncBufReadExt, BufReader};
#[cfg(not(unix))]
use tokio::process::Command;
use uuid::Uuid;
@@ -340,6 +341,11 @@ impl ClaudeBridgeRuntime {
/// Spawn a `claude` CLI process and stream its output.
///
/// Uses a PTY on Unix so Node.js line-buffers stdout instead of
/// full-buffering (which causes the bridge to hang on non-TTY pipes).
/// Arguments are passed via `execve` (no shell) — injection-safe by
/// construction.
///
/// Returns the session_id if captured from the `system` init message.
async fn run_claude_session(
&self,
@@ -347,38 +353,42 @@ impl ClaudeBridgeRuntime {
resume_session_id: Option<&str>,
extra_env: &std::collections::HashMap<String, String>,
) -> Result<Option<String>, WorkerError> {
let mut cmd = Command::new("claude");
cmd.arg("-p")
let max_turns_str = self.config.max_turns.to_string();
// Spawn with PTY on Unix to fix Node.js stdout buffering.
// All arguments are passed individually via execve — never through
// a shell interpreter. This eliminates shell injection by construction.
#[cfg(unix)]
let (mut child, stdout, stderr) = {
let (pty, pts) = pty_process::open().map_err(|e| WorkerError::ExecutionFailed {
reason: format!("failed to allocate PTY: {}", e),
})?;
let mut cmd = pty_process::Command::new("claude");
cmd = cmd
.arg("-p")
.arg(prompt)
.arg("--output-format")
.arg("stream-json")
.arg("--verbose")
.arg("--max-turns")
.arg(self.config.max_turns.to_string())
.arg(&max_turns_str)
.arg("--model")
.arg(&self.config.model);
if let Some(sid) = resume_session_id {
cmd.arg("--resume").arg(sid);
cmd = cmd.arg("--resume").arg(sid);
}
// Inject credentials into the child process environment without
// mutating the global process env (which is unsafe in multi-threaded programs).
cmd.envs(extra_env);
cmd = cmd.envs(extra_env.iter());
cmd = cmd.current_dir("/workspace");
// Keep stderr on a separate pipe — pty-process attaches the PTY
// to all fds by default, which would merge stderr into the PTY
// stream and break NDJSON parsing.
cmd = cmd.stderr(std::process::Stdio::piped());
cmd.current_dir("/workspace")
.stdout(std::process::Stdio::piped())
.stderr(std::process::Stdio::piped());
let mut child = cmd.spawn().map_err(|e| WorkerError::ExecutionFailed {
reason: format!("failed to spawn claude: {}", e),
})?;
let stdout = child
.stdout
.take()
.ok_or_else(|| WorkerError::ExecutionFailed {
reason: "failed to capture claude stdout".to_string(),
let mut child = cmd.spawn(pts).map_err(|e| WorkerError::ExecutionFailed {
reason: format!("failed to spawn claude with PTY: {}", e),
})?;
let stderr = child
@@ -388,6 +398,57 @@ impl ClaudeBridgeRuntime {
reason: "failed to capture claude stderr".to_string(),
})?;
// stdout comes from the PTY master, which implements AsyncRead
let stdout: Box<dyn tokio::io::AsyncRead + Unpin + Send> = Box::new(pty);
(child, stdout, stderr)
};
// Non-Unix fallback (Windows CI) — no PTY, direct spawn.
// Claude bridge only runs in Linux Docker containers, so this path
// exists solely for compilation on Windows targets.
#[cfg(not(unix))]
let (mut child, stdout, stderr) = {
let mut cmd = Command::new("claude");
cmd.arg("-p")
.arg(prompt)
.arg("--output-format")
.arg("stream-json")
.arg("--verbose")
.arg("--max-turns")
.arg(&max_turns_str)
.arg("--model")
.arg(&self.config.model);
if let Some(sid) = resume_session_id {
cmd.arg("--resume").arg(sid);
}
cmd.envs(extra_env);
cmd.current_dir("/workspace")
.stdout(std::process::Stdio::piped())
.stderr(std::process::Stdio::piped());
let mut child = cmd.spawn().map_err(|e| WorkerError::ExecutionFailed {
reason: format!("failed to spawn claude: {}", e),
})?;
let stdout_pipe = child
.stdout
.take()
.ok_or_else(|| WorkerError::ExecutionFailed {
reason: "failed to capture claude stdout".to_string(),
})?;
let stderr = child
.stderr
.take()
.ok_or_else(|| WorkerError::ExecutionFailed {
reason: "failed to capture claude stderr".to_string(),
})?;
let stdout: Box<dyn tokio::io::AsyncRead + Unpin + Send> = Box::new(stdout_pipe);
(child, stdout, stderr)
};
// Spawn stderr reader that forwards lines as log events
let client_for_stderr = Arc::clone(&self.client);
let job_id = self.config.job_id;
@@ -1027,4 +1088,51 @@ mod tests {
let copied = copy_dir_recursive(nonexistent, dst.path()).unwrap();
assert_eq!(copied, 0);
}
/// Regression test: arguments are passed individually (not via shell string),
/// so shell metacharacters in prompt/model/session_id are harmless.
#[test]
fn command_args_no_shell_interpretation() {
// Prompt, model, and session_id may contain shell metacharacters from
// user-supplied task descriptions or LLM output. Since we use
// Command::arg() (execve), these are passed as literal strings.
let prompt = "Fix the user's bug; echo $HOME && rm -rf /";
let model = "claude-3-opus-20240229";
let session_id = "'; DROP TABLE jobs; --";
let max_turns = 10u32;
let max_turns_str = max_turns.to_string();
let args: Vec<&str> = vec![
"-p",
prompt,
"--output-format",
"stream-json",
"--verbose",
"--max-turns",
&max_turns_str,
"--model",
model,
"--resume",
session_id,
];
// All values present as literal strings — no shell interpretation
// ["-p", prompt, "--output-format", "stream-json", "--verbose",
// "--max-turns", "10", "--model", model, "--resume", session_id]
assert_eq!(args[1], prompt);
assert_eq!(args[8], model);
assert_eq!(args[10], session_id);
// Shell metacharacters preserved, not expanded
assert!(args[1].contains("$HOME"));
assert!(args[1].contains("&&"));
assert!(args[10].contains("'; DROP TABLE"));
}
/// Verify PTY is available on Unix platforms.
#[cfg(unix)]
#[tokio::test]
async fn pty_opens_successfully() {
let result = pty_process::open();
assert!(result.is_ok(), "PTY allocation should succeed on Unix");
}
}