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Editing: cagefsctl_user.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
#
"""
User-level CLI utility for managing website isolation.

This script runs via proxyexec with root privileges but operates on behalf
of the calling user. It validates that the user only manages domains they own.

Commands:
    site-isolation-enable --domain DOMAIN[,DOMAIN2,...]   Enable site isolation for domain(s)
    site-isolation-disable --domain DOMAIN[,DOMAIN2,...]  Disable site isolation for domain(s)
    site-isolation-list                                   List domains with site isolation enabled

All commands output JSON:
    Success: {"result": "success", "enabled_sites": ["domain1", "domain2"]}
    Error:   {"result": "ERROR_CODE"}
"""

import argparse
import json
import logging
import os
import sys
import pwd

from clcommon.cpapi import domain_owner, userdomains
from clcommon.cpapi.cpapiexceptions import NoDomain

from clcagefslib.cli import (
    call_via_proxyexec,
    in_cagefs,
    is_running_via_proxyexec,
)
from clcagefslib.domain import (
    enable_website_isolation,
    disable_website_isolation,
    get_websites_with_enabled_isolation,
    is_website_isolation_allowed_server_wide,
    is_website_isolation_allowed_for_user,
)
from clcagefslib.fs import user_exists

# Logging configuration
LOG_FILE = "/var/log/cloudlinux/cagefsctl-user.log"

# Proxyexec alias for all cagefsctl-user commands
PROXYEXEC_ALIAS = "CAGEFSCTL_USER"

def _safe_for_log(value):
    """Escape control characters before interpolating untrusted values into a log line.

The cagefsctl-user log uses a single-prefix formatter ('[LEVEL | ts]: %(message)s'),
    so an unescaped '\\n' inside a user-supplied value (e.g. `domain`) yields a forged
    second line that an admin reads as a separately-logged event. Apply to every
    user-controlled value reaching a logger.* call in this module.
    """
    if value is None:
        return value
    if isinstance(value, (list, tuple)):
        return type(value)(_safe_for_log(v) for v in value)
    if not isinstance(value, str):
        value = str(value)
    return value.encode("unicode_escape").decode("ascii")

def setup_logger():
    """
    Set up logging to file only (no console output).

Returns:
        logging.Logger: Configured logger instance
    """
    logger = logging.getLogger("cagefsctl-user")
    logger.setLevel(logging.INFO)
    # Disable propagation to root logger to prevent console output
    logger.propagate = False
    try:
        fh = logging.FileHandler(LOG_FILE)
        fh.setFormatter(logging.Formatter(
            "[%(levelname)s | %(asctime)s]: %(message)s"
        ))
        logger.addHandler(fh)
    except (IOError, OSError):
        # Cannot write to log file, continue without file logging
        pass
    return logger

logger = setup_logger()

class ErrorCodes:
    """Error codes for JSON responses."""
    SITE_ISOLATION_NOT_ALLOWED = "Site isolation feature is not allowed"
    DOMAIN_NOT_FOUND = "Specified domain is not found"
    USER_NOT_FOUND = "User not found"
    INTERNAL_ERROR = "Internal error"
    MISSING_DOMAIN = "Domain is not specified"
    ROOT_NOT_ALLOWED = "Utility cannot be run as root"

def get_calling_user():
    """
    Get the username of the calling user from proxyexec environment.

When running via proxyexec, PROXYEXEC_UID contains the original user's UID.
    Falls back to current process UID if not set.

Returns:
        str: Username of the calling user
        None: If user cannot be determined
    """
    proxyexec_uid = os.environ.get("PROXYEXEC_UID")
    if not proxyexec_uid:
        return None
    try:
        uid = int(proxyexec_uid)
        pw = pwd.getpwuid(uid)
        return pw.pw_name
    except (ValueError, KeyError):
        return None

def json_response(result, enabled_sites=None, message=None):
    """
    Create a JSON response dictionary.

Args:
        result: "success" or error code
        enabled_sites: Optional list of enabled sites (for success responses)
        message: Optional error message with additional details

Returns:
        dict: Response dictionary
    """
    response = {"result": result}
    if enabled_sites is not None:
        response["enabled_sites"] = enabled_sites
    if message is not None:
        response["message"] = message
    return response

def output_json(response):
    """Print JSON response to stdout."""
    print(json.dumps(response))

def validate_domain_ownership(username, domain):
    """
    Validate that a domain belongs to the specified user.

Args:
        username: The username to check ownership for
        domain: The domain to validate

Returns:
        tuple: (is_valid, error_code)
            is_valid: True if domain belongs to user
            error_code: Error code if validation fails, None otherwise
    """
    try:
        owner = domain_owner(domain)
        if owner is None:
            # Fallback: domain_owner() may not resolve subdomains
            # on some panels (e.g. DirectAdmin). Check via userdomains().
            user_domains = [d for d, _ in userdomains(username)]
            if domain in user_domains:
                return True, None
            return False, ErrorCodes.DOMAIN_NOT_FOUND
        if owner != username:
            return False, ErrorCodes.DOMAIN_NOT_FOUND
        return True, None
    except NoDomain:
        return False, ErrorCodes.DOMAIN_NOT_FOUND
    except Exception:
        return False, ErrorCodes.INTERNAL_ERROR

def get_validated_user():
    """
    Get the calling user and validate they exist.

Returns:
        tuple: (username, error_code)
            username: The validated username, or None if validation failed
            error_code: Error code if validation failed, or None if successful
    """
    username = get_calling_user()
    if not username:
        logger.error("User not found")
        return None, ErrorCodes.USER_NOT_FOUND

if not user_exists(username):
        logger.error("User %s does not exist", username)
        return None, ErrorCodes.USER_NOT_FOUND

return username, None

def validate_domain_for_user(username, domain):
    """
    Validate domain argument and ownership for a user.

Args:
        username: The username to check ownership for
        domain: The domain to validate

Returns:
        tuple: (is_valid, error_code)
            is_valid: True if domain is valid and belongs to user
            error_code: Error code if validation failed, None otherwise
    """
    if not domain:
        logger.error("Missing domain argument")
        return False, ErrorCodes.MISSING_DOMAIN

is_valid, error_code = validate_domain_ownership(username, domain)
    if not is_valid:
        logger.error("Domain validation failed: user=%s, domain=%s, error=%s",
                     username, _safe_for_log(domain), error_code)
        return False, error_code

return True, None

def parse_domains(domain_arg):
    """
    Parse comma-separated domain argument into a list of domains.

Args:
        domain_arg: Comma-separated domain string (e.g., "domain1.com,domain2.com")

Returns:
        list: List of domain names, with whitespace stripped
    """
    if not domain_arg:
        return []
    return [d.strip() for d in domain_arg.split(",") if d.strip()]

def cmd_site_isolation_enable(args):
    """Handle site-isolation-enable command."""
    domains = parse_domains(args.domain)
    logger.info("site-isolation-enable called: domains=%s", _safe_for_log(domains))

if not domains:
        logger.error("No domains specified")
        output_json(json_response(ErrorCodes.MISSING_DOMAIN))
        return 1

username, error = get_validated_user()
    if error:
        output_json(json_response(error))
        return 1

if not is_website_isolation_allowed_server_wide():
        logger.error("Site isolation not allowed server-wide")
        output_json(json_response(ErrorCodes.SITE_ISOLATION_NOT_ALLOWED))
        return 1

if not is_website_isolation_allowed_for_user(username):
        logger.error("Site isolation not allowed for user %s", username)
        output_json(json_response(ErrorCodes.SITE_ISOLATION_NOT_ALLOWED))
        return 1

# Validate all domains first
    for domain in domains:
        is_valid, error = validate_domain_for_user(username, domain)
        if not is_valid:
            output_json(json_response(error))
            return 1

try:
        for domain in domains:
            enable_website_isolation(username, domain)
        enabled_sites = get_websites_with_enabled_isolation(username)
        logger.info("Site isolation enabled: user=%s, domains=%s, enabled_sites=%s",
                    username, _safe_for_log(domains), _safe_for_log(enabled_sites))
        output_json(json_response("success", enabled_sites))
        return 0
    except Exception as e:
        # Use logger.error (not logger.exception) so the auto-appended traceback
        # line — ExceptionType: str(exc) — does not bypass _safe_for_log when
        # the exception carries an attacker-controlled value in its message.
        logger.error("Failed to enable site isolation: user=%s, domains=%s, error=%s",
                     username, _safe_for_log(domains), _safe_for_log(e))
        output_json(json_response(ErrorCodes.INTERNAL_ERROR, message=str(e)))
        return 1

def cmd_site_isolation_disable(args):
    """Handle site-isolation-disable command."""
    domains = parse_domains(args.domain)
    logger.info("site-isolation-disable called: domains=%s", _safe_for_log(domains))

if not domains:
        logger.error("No domains specified")
        output_json(json_response(ErrorCodes.MISSING_DOMAIN))
        return 1

username, error = get_validated_user()
    if error:
        output_json(json_response(error))
        return 1

try:
        for domain in domains:
            disable_website_isolation(username, domain)
        enabled_sites = get_websites_with_enabled_isolation(username)
        logger.info("Site isolation disabled: user=%s, domains=%s, enabled_sites=%s",
                    username, _safe_for_log(domains), _safe_for_log(enabled_sites))
        output_json(json_response("success", enabled_sites))
        return 0
    except Exception as e:
        logger.error("Failed to disable site isolation: user=%s, domains=%s, error=%s",
                     username, _safe_for_log(domains), _safe_for_log(e))
        output_json(json_response(ErrorCodes.INTERNAL_ERROR, message=str(e)))
        return 1

def cmd_site_isolation_list(args):
    """Handle site-isolation-list command."""
    logger.info("site-isolation-list called")

username, error = get_validated_user()
    if error:
        output_json(json_response(error))
        return 1

try:
        enabled_sites = get_websites_with_enabled_isolation(username)
        logger.info("Site isolation list: user=%s, enabled_sites=%s",
                    username, _safe_for_log(enabled_sites))
        output_json(json_response("success", enabled_sites))
        return 0
    except Exception as e:
        logger.error("Failed to list site isolation: user=%s, error=%s",
                     username, _safe_for_log(e))
        output_json(json_response(ErrorCodes.INTERNAL_ERROR, message=str(e)))
        return 1

def _wrap_deprecated(func, old_name, new_name):
    """Return a wrapper that prints a deprecation warning then delegates."""
    def wrapper(args):
        print(f"WARNING: {old_name} is deprecated, use {new_name}",
              file=sys.stderr)
        return func(args)
    return wrapper

def create_parser():
    """Create argument parser for cagefsctl-user."""
    parser = argparse.ArgumentParser(
        prog="cagefsctl-user",
        description="User-level CLI utility for managing CloudLinux Isolates.",
    )

subparsers = parser.add_subparsers(
        title="commands",
        dest="command",
        help="Available commands",
    )

# isolates-enable command (primary)
    enable_parser = subparsers.add_parser(
        "isolates-enable",
        help="Enable isolation for domain(s)",
    )
    enable_parser.add_argument(
        "--domain",
        required=True,
        help="Domain name(s) to enable isolation for (comma-separated)",
    )
    enable_parser.set_defaults(func=cmd_site_isolation_enable)

# isolates-disable command (primary)
    disable_parser = subparsers.add_parser(
        "isolates-disable",
        help="Disable isolation for domain(s)",
    )
    disable_parser.add_argument(
        "--domain",
        required=True,
        help="Domain name(s) to disable isolation for (comma-separated)",
    )
    disable_parser.set_defaults(func=cmd_site_isolation_disable)

# isolates-list command (primary)
    list_parser = subparsers.add_parser(
        "isolates-list",
        help="List domains with isolation enabled",
    )
    list_parser.set_defaults(func=cmd_site_isolation_list)

# Deprecated aliases (backward compatible, print warning)
    dep_enable = subparsers.add_parser(
        "site-isolation-enable",
        help="(deprecated, use isolates-enable)",
    )
    dep_enable.add_argument("--domain", required=True, help=argparse.SUPPRESS)
    dep_enable.set_defaults(func=_wrap_deprecated(
        cmd_site_isolation_enable, "site-isolation-enable", "isolates-enable"))

dep_disable = subparsers.add_parser(
        "site-isolation-disable",
        help="(deprecated, use isolates-disable)",
    )
    dep_disable.add_argument("--domain", required=True, help=argparse.SUPPRESS)
    dep_disable.set_defaults(func=_wrap_deprecated(
        cmd_site_isolation_disable, "site-isolation-disable", "isolates-disable"))

dep_list = subparsers.add_parser(
        "site-isolation-list",
        help="(deprecated, use isolates-list)",
    )
    dep_list.set_defaults(func=_wrap_deprecated(
        cmd_site_isolation_list, "site-isolation-list", "isolates-list"))

return parser

def main(argv=None):
    """Main entry point."""
    parser = create_parser()
    args = parser.parse_args(argv)

# Guard: do not allow running as root unless via proxyexec
    # When running via proxyexec, PROXYEXEC_UID is set
    if os.getuid() == 0 and not is_running_via_proxyexec():
        logger.error("Direct root invocation not allowed")
        output_json(json_response(ErrorCodes.ROOT_NOT_ALLOWED))
        return 1

# If running as user (not root via proxyexec)
    if os.getuid() != 0:
        if not in_cagefs():
            print("This utility is only available inside CageFS.\n"
                  "Please run it via: cagefs_enter cagefsctl-user <command>",
                  file=sys.stderr)
            return 1

# Inside CageFS - call via proxyexec to get root privileges
        if not args.command:
            parser.print_help()
            return 1

# Build args list for proxyexec
        args_list = sys.argv[1:]  # Pass all original args
        result = call_via_proxyexec(PROXYEXEC_ALIAS, args_list)
        if result is None:
            output_json(json_response(
                ErrorCodes.INTERNAL_ERROR,
                message="Failed to execute via proxyexec"
            ))
            return 1
        return result

# Running as root via proxyexec - execute the command
    if not hasattr(args, "func"):
        parser.print_help()
        return 1

return args.func(args)

if __name__ == "__main__":
    sys.exit(main())

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