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Filename : php.py
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#!/opt/cloudlinux/venv/bin/python3 -sbb
# -*- coding: utf-8 -*-
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2021 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENCE.TXT
#
import os
import signal
import logging
import time
from pathlib import Path

from clcommon.clpwd import drop_privileges
import psutil

from clcagefslib.webisolation import jail_utils


def _term_process(pid, sig):
    try:
        os.kill(pid, sig)
    except OSError as e:
        logging.error("Failed to terminate process PID %s: %s", pid, str(e))
        return False
    return True


def force_process_kill(pids):
    timeout = time.time() + 5.0
    while time.time() < timeout and pids:
        for pid in list(pids):
            if not psutil.pid_exists(pid):
                pids.remove(pid)

    for pid in list(pids):
        _term_process(pid, signal.SIGKILL)


def _get_website_isolation_docroot(pid: int) -> str | None:
    """
    Checks if the process is in the isolated environment.
    Returns path to process document root or None
    """
    website_isolation_marker = Path(f"/proc/{pid}/root/var/.cagefs/.cagefs.website")

    try:
        return website_isolation_marker.read_text().strip()
    except (PermissionError, OSError, FileNotFoundError):
        return None


def reload_processes_with_docroots(username: str, filter_by_docroots: list[str]) -> None:
    """
    If filter_by_docroots is not empty - reload only processes with DOCUMENT_ROOT
    environment variable matching one of the given docroots.
    Sends SIGTERM/SIGKILL to all matching processes owned by the given username.
    If filter_by_docroots is empty - reload all processes owned by the given username with DOCUMENT_ROOT set.
    """
    docroots = set([dr for dr in filter_by_docroots if dr])
    signaled_pids = set()
    logging.debug(f"Requested to reload processes for user '{username}' and docroots: {docroots}")

    # first of all invalidate the existing cache
    for document_root in docroots:
        jail_utils.invalidate_ns_cache(username, document_root)

    # Iterate through all processes and filter by username first
    for proc in psutil.process_iter(attrs=["pid", "name", "username"]):
        current_process = proc
        if current_process.info.get("username") != username:
            continue
        try:
            env = current_process.environ()
        except psutil.AccessDenied:
            logging.warning(
                "Access denied to process PID %s; skipping", current_process.info.get("pid")
            )
            continue

        # _get_website_isolation_docroot returns document root for processes
        # which are already isolated, while DOCUMENT_ROOT in env gives us
        # processes which should be inside isolation (e.g. to kill during site-isolation-enable)
        document_root = _get_website_isolation_docroot(proc.pid) or env.get("DOCUMENT_ROOT")
        if docroots and document_root not in docroots:
            continue

        pid = current_process.info.get("pid")
        if pid is None or pid in signaled_pids:
            continue

        with drop_privileges(username):
            logging.info(f"Terminating process PID {pid} with DOCUMENT_ROOT={document_root}")
            if not _term_process(pid, signal.SIGTERM):
                continue
        signaled_pids.add(pid)

    with drop_privileges(username):
        force_process_kill(signaled_pids)