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✏️ Editing: jail_config_builder.py

#!/opt/cloudlinux/venv/bin/python3 -sbb
# -*- coding: utf-8 -*-
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2025 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENCE.TXT
#
"""
Builder for website isolation jail mount configurations.

Collects user docroots and isolation settings, then generates
the complete jail mount configuration.
"""
import logging
from pathlib import Path

from clcommon import ClPwd
from clcommon.cpapi import userdomains
from clcommon.cpapi.cpapiexceptions import NoPanelUser

from ..io import write_via_tmp
from . import config, jail_utils
from .jail_config import MountConfig
from .mount_config import IsolatedRootConfig
from .mount_ordering import build_docroot_tree, process_ordered_mounts
from .mount_types import MountType

class JailMountsConfigBuilder:
    """
    Builder for generating jail mount configuration files.

Collects docroots and isolation settings, then generates
    the mount configuration string for the jail.c implementation.
    """

def __init__(self, user: str):
        self.user = user
        self._all_docroots: set[str] = set()
        self._isolated_docroots: set[str] = set()
        self._phpselector_docroots: set[str] = set()

def add_docroot(self, docroot: str) -> None:
        """Register a docroot path for the user."""
        self._all_docroots.add(docroot)

def enable_isolation(self, docroot: str) -> None:
        """Mark a docroot as requiring isolation."""
        self._isolated_docroots.add(docroot)

def enable_phpselector(self, docroot: str) -> None:
        """Enable per-domain PHP selector for a docroot."""
        self._phpselector_docroots.add(docroot)

def build(self) -> str:
        """
        Generate the complete mount configuration.

Returns:
            Configuration string in jail.c mount syntax.
        """
        pw = ClPwd().get_pw_by_name(self.user)
        homedir = pw.pw_dir
        uid, gid = pw.pw_uid, pw.pw_gid

# Build docroot tree once for all isolated docroots
        tree = build_docroot_tree(self._all_docroots)

# Generate config for each isolated docroot
        generated_configs = []
        for docroot in sorted(self._isolated_docroots, key=len):
            split_storage_base = jail_utils.full_website_path(homedir, docroot)

home_overlay = IsolatedRootConfig(
                root_path=f"{split_storage_base}/home", target=homedir, persistent=True
            )

# Process ordered mounts for this isolated docroot
            docroot_mounts = process_ordered_mounts(
                active_docroot=docroot, tree=tree, uid=uid, gid=gid
            )

jail_config = MountConfig(uid=uid, gid=gid)

# Add storage for the overlay'ed dir
            jail_config.add_overlay(home_overlay)

# open .clwpos directory to make redis.sock available
            awp_path = f"{homedir}/.clwpos"
            home_overlay.mount(MountType.BIND, awp_path, awp_path, ("mkdir",))

# Add docroot mounts (from tree processing)
            # Mount them into already created overlay
            for mount in docroot_mounts:
                home_overlay.mount(mount.type, mount.source, mount.target, mount.options)

# Apply mounts from isolated root and close target directory
            jail_config.close_overlay(home_overlay)

# Home directory is already overlayed, we can apply per-domain mounts directly
            jail_config.add(MountType.USER_MOUNTS, "/")

# php selector mounts (only when per-domain PHP selector is enabled)
            if docroot in self._phpselector_docroots:
                jail_config.add(
                    MountType.BIND, source=f"/etc/cl.selector/{jail_utils.get_website_id(docroot)}",
                    target="/etc/cl.selector"
                )
                jail_config.add(
                    MountType.BIND, source=f"/etc/cl.php.d/{jail_utils.get_website_id(docroot)}",
                    target="/etc/cl.php.d"
                )

# Override proxyexec token with website specific folder
            jail_config.add(
                MountType.BIND,
                source=f"/var/.cagefs/website/{jail_utils.get_website_id(docroot)}",
                target="/var/.cagefs",
            )

generated_configs.append(jail_config.render(docroot))

return "\n".join(generated_configs)

def write_jail_mounts_config(user: str, user_config: config.UserConfig | None) -> None:
    """
    Write or remove the jail mounts configuration file for a user.

If user_config is None or has no enabled websites, the config file is removed.
    Otherwise, builds and writes the mount configuration.

Args:
        user: Username to generate config for
        user_config: User's isolation configuration, or None to remove config
    """
    jail_config_path = Path(jail_utils.get_jail_config_path(user))

if user_config is None or not user_config.enabled_websites:
        jail_config_path.unlink(missing_ok=True)
        return

builder = JailMountsConfigBuilder(user)

try:
        domain_to_docroot_map = dict(userdomains(user))
    except NoPanelUser:
        logging.warning("Cannot regenerate mount configuration, no panel user=%s", user)
        return

# add docroot information for isolations
    for docroot in domain_to_docroot_map.values():
        builder.add_docroot(docroot)

# add information about which websites should have isolation enabled
    for domain in user_config.enabled_websites:
        try:
            docroot = domain_to_docroot_map[domain]
        except KeyError:
            logging.warning("Docroot not found for domain %s", domain)
            continue

builder.enable_isolation(docroot)

# PHP Selector is enabled for all isolated websites
    for domain in user_config.enabled_websites:
        try:
            docroot = domain_to_docroot_map[domain]
        except KeyError:
            logging.warning("Docroot not found for domain %s", domain)
            continue

builder.enable_phpselector(docroot)

result = builder.build()
    jail_config_path.parent.mkdir(exist_ok=True, mode=0o755)
    write_via_tmp(str(jail_config_path.parent), str(jail_config_path), result)

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