bot-bottle/claude_bottle/pipelock.py

"""Pipelock sidecar lifecycle for the per-agent egress topology.

Pipelock (https://github.com/luckyPipewrench/pipelock) is an HTTP
forward proxy with hostname allowlisting + DLP scanning + URL-entropy
checks. One sidecar per agent, attached to the agent's --internal
network and a per-agent user-defined egress bridge. Combined with
HTTPS_PROXY/HTTP_PROXY pointing at the sidecar's service name, pipelock
is the only egress route the agent has.

Image pin: ghcr.io/luckypipewrench/pipelock@sha256:<digest> for tag 2.3.0.
"""

from __future__ import annotations

import os
import re
import subprocess
from pathlib import Path

from .log import die, info, warn
from .manifest import Manifest

# Pipelock image, pinned by digest. The digest is the multi-arch image
# index for ghcr.io/luckypipewrench/pipelock:2.3.0.
PIPELOCK_IMAGE = os.environ.get(
    "CLAUDE_BOTTLE_PIPELOCK_IMAGE",
    "ghcr.io/luckypipewrench/pipelock@sha256:3b1a39417b98406ddc5dc2d8fcb42865ddc0c68a43d355db55f0f8cb06bc6de9",
)

# Listening port for pipelock's forward proxy.
PIPELOCK_PORT = os.environ.get("CLAUDE_BOTTLE_PIPELOCK_PORT", "8888")

# Baked-in default allowlist for hosts Claude Code itself needs.
DEFAULT_ALLOWLIST: tuple[str, ...] = (
    "api.anthropic.com",
    "statsig.anthropic.com",
    "sentry.io",
    "claude.ai",
    "platform.claude.com",
    "downloads.claude.ai",
    "raw.githubusercontent.com",
)


def pipelock_container_name(slug: str) -> str:
    return f"claude-bottle-pipelock-{slug}"


def pipelock_proxy_url(slug: str) -> str:
    return f"http://{pipelock_container_name(slug)}:{PIPELOCK_PORT}"


def pipelock_proxy_host_port(slug: str) -> str:
    return f"{pipelock_container_name(slug)}:{PIPELOCK_PORT}"


# --- Allowlist resolution --------------------------------------------------


def pipelock_bottle_allowlist(manifest: Manifest, bottle_name: str) -> list[str]:
    """Hostnames in bottles[<bottle_name>].egress.allowlist."""
    return list(manifest.bottles[bottle_name].egress.allowlist)


def pipelock_bottle_ssh_hostnames(manifest: Manifest, bottle_name: str) -> list[str]:
    return [e.Hostname for e in manifest.bottles[bottle_name].ssh if e.Hostname]


_IPV4_RE = re.compile(r"^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$")


def is_ipv4_literal(s: str) -> bool:
    """Pipelock's SSRF check fires on resolved IP, so an IP-literal
    Hostname goes to ssrf.ip_allowlist while a hostname goes to
    trusted_domains."""
    if not s:
        return False
    return bool(_IPV4_RE.match(s))


def pipelock_bottle_ssh_trusted_domains(manifest: Manifest, bottle_name: str) -> list[str]:
    return [h for h in pipelock_bottle_ssh_hostnames(manifest, bottle_name) if not is_ipv4_literal(h)]


def pipelock_bottle_ssh_ip_cidrs(manifest: Manifest, bottle_name: str) -> list[str]:
    return [f"{h}/32" for h in pipelock_bottle_ssh_hostnames(manifest, bottle_name) if is_ipv4_literal(h)]


def pipelock_effective_allowlist(manifest: Manifest, bottle_name: str) -> list[str]:
    """Deduplicated union of: baked-in defaults, bottle.egress.allowlist,
    bottle.ssh[].Hostname. Sorted for stability."""
    seen: dict[str, None] = {}
    for h in DEFAULT_ALLOWLIST:
        seen.setdefault(h, None)
    for h in pipelock_bottle_allowlist(manifest, bottle_name):
        if h:
            seen.setdefault(h, None)
    for h in pipelock_bottle_ssh_hostnames(manifest, bottle_name):
        if h:
            seen.setdefault(h, None)
    return sorted(seen.keys())


def pipelock_allowlist_summary(manifest: Manifest, bottle_name: str) -> str:
    """One-line summary for the y/N preflight display:
    "<N> hosts allowed (host1, host2, host3, +M more)"."""
    hosts = pipelock_effective_allowlist(manifest, bottle_name)
    count = len(hosts)
    if count == 0:
        return "0 hosts allowed (none)"
    show = count
    more = 0
    if count > 5:
        show = 3
        more = count - show
    joined = ", ".join(hosts[:show])
    if more > 0:
        return f"{count} hosts allowed ({joined}, +{more} more)"
    return f"{count} hosts allowed ({joined})"


# --- YAML generation -------------------------------------------------------


def pipelock_write_yaml(manifest: Manifest, bottle_name: str, out_path: Path) -> None:
    """Write a pipelock YAML config (mode 600) carrying:
      - the effective allowlist (hostnames),
      - a fixed listen port,
      - strict mode + forward_proxy.enabled + DLP defaults + scan_env.

    Deliberately contains no env values, no secrets, no per-agent
    customization beyond the hostname list."""
    allowlist = pipelock_effective_allowlist(manifest, bottle_name)
    trusted = pipelock_bottle_ssh_trusted_domains(manifest, bottle_name)
    ip_cidrs = pipelock_bottle_ssh_ip_cidrs(manifest, bottle_name)

    lines: list[str] = []
    lines.append("version: 1")
    lines.append("mode: strict")
    lines.append("enforce: true")
    lines.append("")
    lines.append("# Hostnames the agent is allowed to reach. Effective list is")
    lines.append("# claude-bottle defaults UNION bottle.egress.allowlist (sorted, deduped).")
    lines.append("api_allowlist:")
    for h in allowlist:
        lines.append(f'  - "{h}"')
    lines.append("")
    lines.append("forward_proxy:")
    lines.append("  enabled: true")
    lines.append("")
    if trusted:
        lines.append("trusted_domains:")
        for td in trusted:
            lines.append(f'  - "{td}"')
        lines.append("")
    if ip_cidrs:
        lines.append("ssrf:")
        lines.append("  ip_allowlist:")
        for cidr in ip_cidrs:
            lines.append(f'    - "{cidr}"')
        lines.append("")
    lines.append("dlp:")
    lines.append("  include_defaults: true")
    lines.append("  scan_env: true")

    out_path.write_text("\n".join(lines) + "\n")
    out_path.chmod(0o600)


# --- Sidecar lifecycle -----------------------------------------------------


def pipelock_start(
    slug: str,
    internal_network: str,
    egress_network: str,
    yaml_dir: Path,
    yaml_filename: str,
) -> str:
    """Boot the pipelock sidecar:
      1. `docker create` on the internal network with the canonical name
         and argv `run --config /etc/pipelock.yaml --listen 0.0.0.0:<port>`.
      2. `docker cp` the YAML config to /etc/pipelock.yaml in the
         writable layer (parent dir must already exist; image is distroless).
      3. Attach to the per-agent egress network.
      4. `docker start`.
    Returns the container name."""
    name = pipelock_container_name(slug)
    host_yaml = yaml_dir / yaml_filename
    if not host_yaml.is_file():
        die(f"pipelock yaml not found at {host_yaml}; pipelock_write_yaml must run first")

    info(f"starting pipelock sidecar {name} on network {internal_network}")

    create_args = [
        "docker", "create",
        "--name", name,
        "--network", internal_network,
        PIPELOCK_IMAGE,
        "run", "--config", "/etc/pipelock.yaml",
        "--listen", f"0.0.0.0:{PIPELOCK_PORT}",
    ]
    if subprocess.run(create_args, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL).returncode != 0:
        die(f"failed to create pipelock sidecar {name}")

    cp_result = subprocess.run(
        ["docker", "cp", str(host_yaml), f"{name}:/etc/pipelock.yaml"],
        capture_output=True,
        text=True,
    )
    if cp_result.returncode != 0:
        subprocess.run(["docker", "rm", "-f", name], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
        die(f"failed to copy pipelock yaml into {name}: {cp_result.stderr.strip()}")

    if subprocess.run(
        ["docker", "network", "connect", egress_network, name],
        stdout=subprocess.DEVNULL,
        stderr=subprocess.DEVNULL,
    ).returncode != 0:
        subprocess.run(["docker", "rm", "-f", name], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
        die(f"failed to attach pipelock sidecar {name} to egress network {egress_network}")

    if subprocess.run(
        ["docker", "start", name],
        stdout=subprocess.DEVNULL,
        stderr=subprocess.DEVNULL,
    ).returncode != 0:
        subprocess.run(["docker", "rm", "-f", name], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
        die(f"failed to start pipelock sidecar {name}")

    return name


def pipelock_stop(slug: str) -> None:
    """Idempotent: missing container is success."""
    name = pipelock_container_name(slug)
    if subprocess.run(
        ["docker", "inspect", name],
        stdout=subprocess.DEVNULL,
        stderr=subprocess.DEVNULL,
    ).returncode == 0:
        if subprocess.run(
            ["docker", "rm", "-f", name],
            stdout=subprocess.DEVNULL,
            stderr=subprocess.DEVNULL,
        ).returncode != 0:
            warn(f"failed to remove pipelock sidecar {name}; clean up with 'docker rm -f {name}'")