deytenit
6463bad5ee
- Purge misplaced RFCs, scratch tokens, and node-proprietary assets - Decouple remote provisioning to ci/scripts/init-node.py - Add targeted composition orchestration in actions/compose.py - Add host-side Xray stale socket cleanup in /dev/shm - Add actions/env.py for shell exports and .env synchronization - Harden UFW, backup retention, host tempfiles, and notify dispatcher - Add pyproject.toml and Makefile with 78 passing unit tests
488 lines
23 KiB
Python
488 lines
23 KiB
Python
"""Shared Debian baseline. Callers own the exclusive initialization lock."""
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from __future__ import annotations
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from contextlib import contextmanager
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import fcntl
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from functools import wraps
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import hashlib
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import json
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import os
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from pathlib import Path
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import re
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import shutil
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import stat
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import subprocess
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import tempfile
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import urllib.request
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import uuid
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class BaselineError(RuntimeError):
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"""A required baseline postcondition could not be established."""
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def expected_errors(operation):
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@wraps(operation)
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def guarded(*args, **kwargs):
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try:
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return operation(*args, **kwargs)
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except (OSError, ValueError) as exc:
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raise BaselineError("Baseline filesystem or saved state is invalid; inspect the target before retrying.") from exc
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return guarded
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BASE_PACKAGES = ("curl", "wget", "git", "rsyslog", "ufw")
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ADMIN_PACKAGES = (
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"tcpdump", "socat", "rsync", "bind9-dnsutils", "iproute2", "net-tools",
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"traceroute", "ca-certificates", "jq", "sed", "gawk", "tar", "gzip",
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"bzip2", "xz-utils", "unzip", "htop", "iotop", "strace", "lsof",
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"sysstat", "parted", "fdisk", "pciutils", "usbutils", "smartmontools",
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"tmux", "vim", "less", "tree", "bash-completion", "python3",
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"python3-minimal", "python3-yaml", "sudo", "cron", "iptables", "ipset",
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"debian-archive-keyring", "kmod",
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)
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DOCKER_PACKAGES = ("docker-ce", "docker-ce-cli", "containerd.io",
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"docker-buildx-plugin", "docker-compose-plugin")
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SECURITY_PACKAGES = ("crowdsec", "crowdsec-firewall-bouncer-iptables")
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DOCKER_CONFLICTS = ("docker.io", "docker-doc", "docker-compose", "docker-buildx",
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"podman-docker", "containerd", "runc")
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DOCKER_CONFIG = {"data-root": "/srv/docker", "log-driver": "json-file",
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"log-opts": {"max-size": "20m", "max-file": "3"}}
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HELPER_REVISION = "020a8699f95592561f254d8d4ad1bb40d401dfc7"
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HELPER_URL = f"https://raw.githubusercontent.com/chaifeng/ufw-docker/{HELPER_REVISION}/ufw-docker"
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HELPER_SHA256 = "643e56b080567c567b4aa28650196849b2a2da5dd0473fd3e5216b0886035ab0"
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POLICY = Path("/usr/sbin/policy-rc.d")
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POLICY_STATE = Path("/usr/sbin/.apex-policy-rc.d")
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SECURITY_STATE = Path("/var/lib/apex/baseline-security.json")
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SECURITY_SERVICES = {"ufw": "ufw", "crowdsec": "crowdsec",
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"crowdsec-firewall-bouncer-iptables": "crowdsec-firewall-bouncer"}
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SECURITY_CONDITION = "[Unit]\nConditionPathExists=/dev/null/apex-security-start-allowed\n"
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APT = ["apt-get", "-o", "DPkg::Lock::Timeout=60", "-o",
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"Acquire::Retries=2", "-o", "Acquire::http::Timeout=30", "-o",
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"Acquire::https::Timeout=30"]
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def run(args, *, check=True, timeout=300):
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try:
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result = subprocess.run(args, text=True, capture_output=True, timeout=timeout,
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env={**os.environ, "LC_ALL": "C", "DEBIAN_FRONTEND": "noninteractive"})
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except (OSError, subprocess.TimeoutExpired) as exc:
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raise BaselineError(f"Cannot complete {args[0]}: {exc}") from exc
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if check and result.returncode:
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raise BaselineError(f"{args[0]} failed with exit status {result.returncode}; inspect target system logs.")
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return result
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def preflight(*, strict=True):
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if os.geteuid() != 0:
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raise BaselineError("Baseline requires root.")
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if not strict:
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if not Path("/etc/debian_version").is_file():
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raise BaselineError("Base policy requires a Debian-based system.")
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return
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if not Path("/etc/os-release").is_file():
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raise BaselineError("Supported target is Debian 13 amd64 only.")
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release = dict(line.split("=", 1) for line in Path("/etc/os-release").read_text().splitlines()
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if "=" in line and not line.startswith("#"))
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if (release.get("ID", "").strip('"') != "debian" or
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release.get("VERSION_ID", "").strip('"') != "13" or
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run(["dpkg", "--print-architecture"]).stdout.strip() != "amd64"):
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raise BaselineError("Supported target is Debian 13 amd64 only.")
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def package_versions():
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result = run(["dpkg-query", "-W", "-f=${binary:Package}\t${Status}\t${Version}\n"])
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installed = {}
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for line in result.stdout.splitlines():
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fields = line.split("\t")
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if len(fields) == 3 and fields[1].split()[1:] == ["ok", "installed"]:
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installed[fields[0].removesuffix(":amd64")] = fields[2]
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return installed
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def write_managed(path, content, mode=0o644):
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path = Path(path)
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for parent in (path, *path.parents):
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if parent.is_symlink():
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raise BaselineError(f"Refusing managed symlink: {parent}")
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payload = content.encode() if isinstance(content, str) else content
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if path.exists() and path.read_bytes() == payload:
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if path.stat().st_mode & 0o777 != mode:
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path.chmod(mode)
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return False
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path.parent.mkdir(parents=True, exist_ok=True)
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fd, temporary = tempfile.mkstemp(prefix=".apex-", dir=path.parent)
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try:
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with os.fdopen(fd, "wb") as stream:
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stream.write(payload)
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stream.flush()
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os.fsync(stream.fileno())
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os.chmod(temporary, mode)
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os.replace(temporary, path)
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finally:
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if os.path.exists(temporary):
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os.unlink(temporary)
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return True
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def restore_service_policy():
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if not POLICY_STATE.exists():
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return
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backup = POLICY_STATE / "original"
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if (POLICY_STATE.is_symlink() or POLICY_STATE.stat().st_uid != os.geteuid()):
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raise BaselineError("Refusing untrusted service policy recovery state.")
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if (POLICY_STATE / "ready").exists() and POLICY.exists():
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original_matches = (backup.exists() and not POLICY.is_symlink() and
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POLICY.read_bytes() == backup.read_bytes())
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symlink_matches = (backup.is_symlink() and POLICY.is_symlink() and
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os.readlink(backup) == os.readlink(POLICY))
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guard_matches = not POLICY.is_symlink() and POLICY.read_bytes() == b"#!/bin/sh\nexit 101\n"
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if not (original_matches or symlink_matches or guard_matches):
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raise BaselineError("Service policy changed outside APEX; recovery requires explicit reconciliation.")
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if backup.exists() or backup.is_symlink():
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# Copy first: an interrupted restoration must retain its recovery copy.
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temporary = POLICY_STATE / "restoring"
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if temporary.exists() or temporary.is_symlink():
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temporary.unlink()
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shutil.copy2(backup, temporary, follow_symlinks=False)
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os.replace(temporary, POLICY)
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elif (POLICY_STATE / "absent").exists():
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POLICY.unlink(missing_ok=True)
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elif (POLICY_STATE / "ready").exists():
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raise BaselineError("Service policy recovery is incomplete; inspect /usr/sbin/.apex-policy-rc.d.")
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shutil.rmtree(POLICY_STATE)
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@contextmanager
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def service_start_guard():
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lock_path = Path("/run/lock/apex-package-policy.lock")
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lock_path.parent.mkdir(parents=True, exist_ok=True)
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with lock_path.open("a") as lock:
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try:
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fcntl.flock(lock, fcntl.LOCK_EX | fcntl.LOCK_NB)
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except BlockingIOError:
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raise BaselineError("Another APEX package operation is running.") from None
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with _service_start_guard():
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yield
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@contextmanager
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def _service_start_guard():
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restore_service_policy()
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POLICY_STATE.mkdir(mode=0o700)
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try:
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if POLICY.exists() or POLICY.is_symlink():
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shutil.copy2(POLICY, POLICY_STATE / "original", follow_symlinks=False)
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else:
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(POLICY_STATE / "absent").touch()
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(POLICY_STATE / "ready").touch()
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# Replace the path itself, preserving any original symlink in the backup.
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temporary = POLICY_STATE / "guard"
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temporary.write_text("#!/bin/sh\nexit 101\n")
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temporary.chmod(0o755)
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os.replace(temporary, POLICY)
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yield
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finally:
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restore_service_policy()
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@contextmanager
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def security_service_guard(packages):
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"""Guard new security units without occupying package-owned unit paths."""
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record = json.loads(SECURITY_STATE.read_text()) if SECURITY_STATE.exists() else {"version": 2, "services": {}}
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if not isinstance(record, dict) or record.get("version") != 2:
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raise BaselineError("Legacy security service guard state requires explicit reconciliation.")
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managed = record.get("services")
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if not isinstance(managed, dict) or any(SECURITY_SERVICES.get(key) != value for key, value in managed.items()):
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raise BaselineError("Invalid baseline security service recovery state.")
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installed = package_versions()
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for package, service in SECURITY_SERVICES.items():
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if package in packages and package not in installed and package not in managed:
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if run(["systemctl", "is-enabled", service], check=False).stdout.strip() == "masked":
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continue
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managed[package] = service
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write_managed(SECURITY_STATE, json.dumps({"version": 2, "services": managed}), 0o600)
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for service in managed.values():
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dropin = Path(f"/etc/systemd/system/{service}.service.d/99-apex-bootstrap-guard.conf")
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if dropin.exists() and dropin.read_text() != SECURITY_CONDITION:
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raise BaselineError("Security service guard changed outside APEX; reconcile it explicitly.")
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# /dev/null cannot have children: this condition stays false after reboot.
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write_managed(dropin, SECURITY_CONDITION)
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if managed:
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run(["systemctl", "daemon-reload"])
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try:
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yield
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finally:
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installed = package_versions()
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for package, service in managed.items():
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unit_exists = any(Path(f"{directory}/{service}.service").exists() for directory in
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("/etc/systemd/system", "/usr/lib/systemd/system", "/lib/systemd/system"))
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run(["systemctl", "disable", service], check=package in installed or unit_exists)
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dropin = Path(f"/etc/systemd/system/{service}.service.d/99-apex-bootstrap-guard.conf")
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if dropin.exists():
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if dropin.is_symlink() or dropin.read_text() != SECURITY_CONDITION:
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raise BaselineError("Security service guard changed outside APEX; reconcile it explicitly.")
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dropin.unlink()
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if managed:
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run(["systemctl", "daemon-reload"])
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SECURITY_STATE.unlink(missing_ok=True)
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def install_missing(packages):
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installed = package_versions()
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missing = [package for package in packages if package not in installed]
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if not missing:
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return []
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run([*APT, "update", "--error-on=any"])
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command = [*APT, "install", "-y", "--no-install-recommends", "--no-upgrade", "--no-remove", *missing]
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plan = run([*command, "--simulate"]).stdout
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if any(line.startswith("Remv ") or re.match(r"^Inst \S+ \[", line)
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for line in plan.splitlines()):
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raise BaselineError("Missing packages require an upgrade/removal; reconcile packages explicitly before retrying.")
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# Package writes must settle even after coordinator loss; stages gate later work.
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run(command, timeout=None)
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remaining = set(missing) - package_versions().keys()
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if remaining:
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raise BaselineError("Required packages not installed: " + ", ".join(sorted(remaining)))
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return missing
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def base_policy():
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return {"packages": list(BASE_PACKAGES), "files": {
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"/etc/apt/apt.conf.d/99-apex": 'APT::Keep-Downloaded-Packages "0";\n',
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"/etc/systemd/journald.conf.d/99-apex.conf": "[Journal]\nSystemMaxUse=200M\n",
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}, "helper": {"url": HELPER_URL, "sha256": HELPER_SHA256}}
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def configure_common():
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policy = base_policy()
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for legacy in ("/etc/apt/apt.conf.d/01clean", "/etc/systemd/journald.conf.d/maxuse.conf"):
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path = Path(legacy)
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if path.exists() or path.is_symlink():
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path.unlink()
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for path, content in policy["files"].items():
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changed = write_managed(path, content)
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if changed and path.endswith("99-apex.conf"):
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run(["systemctl", "restart", "systemd-journald"])
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target = Path("/usr/local/bin/ufw-docker")
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if (not target.is_file() or hashlib.sha256(target.read_bytes()).hexdigest() != HELPER_SHA256):
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try:
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with urllib.request.urlopen(HELPER_URL, timeout=30) as response:
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data = response.read()
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except OSError as exc:
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raise BaselineError("Unable to download pinned ufw-docker helper.") from exc
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if hashlib.sha256(data).hexdigest() != HELPER_SHA256:
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raise BaselineError("Pinned ufw-docker checksum mismatch.")
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write_managed(target, data, 0o755)
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elif target.is_symlink():
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raise BaselineError("Refusing a symlinked ufw-docker helper.")
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else:
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target.chmod(0o755)
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def docker_preflight(installed):
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conflicts = sorted(set(DOCKER_CONFLICTS) & installed.keys())
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if conflicts:
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raise BaselineError("Conflicting Docker packages require explicit reconciliation: " + ", ".join(conflicts))
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path = Path("/etc/docker/daemon.json")
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try:
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config = json.loads(path.read_text()) if path.exists() else {}
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except (OSError, ValueError) as exc:
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raise BaselineError("Cannot validate existing Docker daemon configuration.") from exc
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if not isinstance(config, dict):
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raise BaselineError("Docker daemon configuration must be an object.")
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for name, value in DOCKER_CONFIG.items():
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if name in config and config[name] != value:
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raise BaselineError(f"Conflicting Docker {name}; reconcile explicitly before initialization.")
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old_data = Path("/var/lib/docker")
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if old_data.exists() and any(old_data.iterdir()):
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raise BaselineError("Existing /var/lib/docker data must be reconciled explicitly; no data migration is automatic.")
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data = Path("/srv/docker")
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if data.is_symlink() or data.parent.is_symlink():
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raise BaselineError("Refusing a redirected Docker data-root.")
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if data.exists() and any(data.iterdir()) and config.get("data-root") != "/srv/docker":
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raise BaselineError("Unmanaged /srv/docker data requires explicit reconciliation.")
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if "docker-ce" in installed:
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active = run(["systemctl", "is-active", "--quiet", "docker"], check=False).returncode == 0
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if active:
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root = run(["docker", "info", "--format", "{{.DockerRootDir}}"] ).stdout.strip()
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if root != "/srv/docker" or any(config.get(key) != value for key, value in DOCKER_CONFIG.items()):
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raise BaselineError("Running Docker has incompatible data-root/log policy; reconcile it before retrying.")
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return {**config, **DOCKER_CONFIG}
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def configure_sources():
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write_managed("/etc/apt/sources.list.d/apex-zfs.sources",
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"Types: deb\nURIs: https://deb.debian.org/debian\nSuites: trixie\n"
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"Components: contrib\nArchitectures: amd64\n"
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"Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg\n")
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for name, key_url, uri, suite, component in (
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("docker", "https://download.docker.com/linux/debian/gpg",
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"https://download.docker.com/linux/debian", "trixie", "stable"),
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("crowdsec", "https://packagecloud.io/crowdsec/crowdsec/gpgkey",
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"https://packagecloud.io/crowdsec/crowdsec/any", "any", "main"),
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):
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key = Path(f"/etc/apt/keyrings/apex-{name}.asc")
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if not key.exists():
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try:
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with urllib.request.urlopen(key_url, timeout=30) as response:
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data = response.read()
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except OSError as exc:
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raise BaselineError(f"Cannot download {name} repository signing key.") from exc
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if not data.startswith(b"-----BEGIN PGP PUBLIC KEY BLOCK-----"):
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raise BaselineError(f"Invalid {name} repository signing key.")
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write_managed(key, data)
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write_managed(f"/etc/apt/sources.list.d/apex-{name}.sources",
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f"Types: deb\nURIs: {uri}\nSuites: {suite}\nComponents: {component}\n"
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f"Architectures: amd64\nSigned-By: {key}\n")
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def ensure_service(name):
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if run(["systemctl", "is-enabled", "--quiet", name], check=False).returncode:
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run(["systemctl", "enable", name])
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if run(["systemctl", "is-active", "--quiet", name], check=False).returncode:
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run(["systemctl", "start", name])
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def repair_bouncer_credentials():
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"""Repair package placeholders without rewriting administrator YAML settings."""
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config = Path("/etc/crowdsec/bouncers/crowdsec-firewall-bouncer.yaml")
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identity = config.with_suffix(".yaml.id")
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for path in (config, identity):
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if any(parent.is_symlink() for parent in (path, *path.parents)):
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raise BaselineError("Refusing redirected CrowdSec bouncer credential paths.")
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if path.exists():
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metadata = path.stat()
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if (not stat.S_ISREG(metadata.st_mode) or metadata.st_nlink != 1 or
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metadata.st_uid != os.geteuid()):
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raise BaselineError("Refusing untrusted CrowdSec bouncer credential files.")
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if not config.exists():
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raise BaselineError("CrowdSec bouncer configuration is missing; reconcile the package installation.")
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content = config.read_text()
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entries = list(re.finditer(r"^(?:api_key|'api_key'|\"api_key\"):[^\r\n]*", content, re.MULTILINE))
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if len(entries) != 1:
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raise BaselineError("CrowdSec bouncer requires one explicit api_key; reconcile its configuration.")
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entry = entries[0]
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for following in content[entry.end():].splitlines():
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if not following.strip() or following.lstrip().startswith("#"):
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continue
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if following[:1].isspace():
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raise BaselineError("Multiline CrowdSec bouncer api_key requires explicit reconciliation.")
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break
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scalar = re.fullmatch(r"(?:api_key|'api_key'|\"api_key\"):[ \t]*(?P<value>\"[^\"]*\"|'[^']*'|[^ \t#'\"]*)(?:[ \t]+(?:#.*)?)?", entry.group())
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if scalar is None:
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raise BaselineError("Unsupported CrowdSec bouncer api_key; reconcile its configuration.")
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value = scalar.group("value")
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uninitialized = value in ("null", "Null", "NULL", "~")
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if value[:1] in ("'", '"'):
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value = value[1:-1]
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if not uninitialized and value not in ("", "<API_KEY>", "$API_KEY", "${API_KEY}"):
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return
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metadata = config.stat()
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registration = "cs-firewall-bouncer-apex-" + uuid.uuid4().hex
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key = run(["cscli", "-oraw", "bouncers", "add", registration]).stdout.strip()
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if not re.fullmatch(r"[A-Za-z0-9_+/=-]{24,256}", key):
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raise BaselineError("CrowdSec bouncer registration did not return a usable API key.")
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start, end = scalar.span("value")
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separator = " " if entry.group()[start - 1] == ":" else ""
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updated = content[:entry.start() + start] + separator + key + content[entry.start() + end:]
|
|
|
|
def publish(path, payload, mode, owner):
|
|
fd, temporary = tempfile.mkstemp(prefix=".apex-", dir=path.parent)
|
|
try:
|
|
with os.fdopen(fd, "w") as stream:
|
|
os.fchown(stream.fileno(), *owner)
|
|
os.fchmod(stream.fileno(), mode)
|
|
stream.write(payload)
|
|
stream.flush()
|
|
os.fsync(stream.fileno())
|
|
os.replace(temporary, path)
|
|
directory = os.open(path.parent, os.O_RDONLY | os.O_DIRECTORY)
|
|
try:
|
|
os.fsync(directory)
|
|
finally:
|
|
os.close(directory)
|
|
finally:
|
|
if os.path.exists(temporary):
|
|
os.unlink(temporary)
|
|
|
|
# Publish the key last: interruption can orphan a registration, but retries
|
|
# replace the placeholder and its package bookkeeping together in this order.
|
|
owner = (metadata.st_uid, metadata.st_gid)
|
|
publish(identity, registration + "\n", 0o600, owner)
|
|
publish(config, updated, (stat.S_IMODE(metadata.st_mode) & 0o640) | 0o600, owner)
|
|
if config.read_text() != updated or identity.read_text().strip() != registration:
|
|
raise BaselineError("CrowdSec bouncer credential publication did not converge.")
|
|
|
|
|
|
@expected_errors
|
|
def apply_base_policy():
|
|
"""The bounded configure/base policy: no Docker, storage or enrollment."""
|
|
preflight(strict=False)
|
|
with service_start_guard(), security_service_guard(BASE_PACKAGES):
|
|
install_missing(BASE_PACKAGES)
|
|
configure_common()
|
|
ensure_service("rsyslog")
|
|
run(["/usr/local/bin/ufw-docker", "install"])
|
|
return {"packages": {key: value for key, value in package_versions().items() if key in BASE_PACKAGES}}
|
|
|
|
|
|
@expected_errors
|
|
def apply_baseline():
|
|
"""Converge baseline and return verified package versions and capabilities."""
|
|
preflight()
|
|
installed = package_versions()
|
|
docker_config = docker_preflight(installed)
|
|
kernel = run(["uname", "-r"]).stdout.strip()
|
|
if not re.fullmatch(r"[A-Za-z0-9.+_-]+", kernel):
|
|
raise BaselineError("Unsupported running kernel release.")
|
|
packages = (*BASE_PACKAGES, *ADMIN_PACKAGES, *DOCKER_PACKAGES,
|
|
*SECURITY_PACKAGES, "linux-headers-amd64", f"linux-headers-{kernel}",
|
|
"zfsutils-linux", "zfs-dkms")
|
|
with service_start_guard(), security_service_guard(packages):
|
|
install_missing((*BASE_PACKAGES, *ADMIN_PACKAGES))
|
|
configure_sources()
|
|
install_missing(("crowdsec",))
|
|
install_missing(packages)
|
|
repair_bouncer_credentials()
|
|
configure_common()
|
|
write_managed("/etc/docker/daemon.json", json.dumps(docker_config, indent=2) + "\n")
|
|
Path("/srv/docker").mkdir(parents=True, exist_ok=True)
|
|
ensure_service("containerd")
|
|
ensure_service("docker")
|
|
ensure_service("rsyslog")
|
|
ensure_service("cron")
|
|
root = run(["docker", "info", "--format", "{{.DockerRootDir}}"] ).stdout.strip()
|
|
if root != "/srv/docker":
|
|
raise BaselineError("Docker did not activate the required /srv/docker data-root.")
|
|
compose = run(["docker", "compose", "version", "--short"]).stdout.strip()
|
|
if not compose:
|
|
raise BaselineError("Docker Compose capability is unavailable.")
|
|
module = run(["modprobe", "zfs"], check=False)
|
|
if module.returncode:
|
|
raise BaselineError(f"ZFS unavailable for running kernel {kernel}; install matching headers/module or reboot into the supported kernel, then retry. No automatic reboot was performed.")
|
|
zfs = run(["zfs", "version"]).stdout.strip()
|
|
versions = package_versions()
|
|
if set(packages) - versions.keys():
|
|
raise BaselineError("Baseline package verification failed.")
|
|
return {"packages": {name: versions[name] for name in packages},
|
|
"capabilities": {"docker_data_root": root, "compose": compose, "zfs": zfs,
|
|
"kernel": kernel, "ufw_docker_sha256": HELPER_SHA256},
|
|
"sources": {"docker": "docker.com/debian trixie stable",
|
|
"crowdsec": "packagecloud.io/crowdsec/crowdsec/any any main",
|
|
"zfs": "Debian trixie contrib"}}
|
|
|
|
|
|
if __name__ == "__main__":
|
|
import argparse
|
|
from .state import ProvisionError, exclusive_lock
|
|
parser = argparse.ArgumentParser(description=__doc__)
|
|
parser.add_argument("--base-policy", action="store_true")
|
|
args = parser.parse_args()
|
|
try:
|
|
preflight(strict=not args.base_policy)
|
|
with exclusive_lock("/var/lib/apex-init/init.lock"):
|
|
print(json.dumps(apply_base_policy() if args.base_policy else apply_baseline(), sort_keys=True))
|
|
except (BaselineError, OSError, ProvisionError) as exc:
|
|
parser.exit(1, f"Baseline failed: {exc}\n")
|