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import logging
import os
import pwd
import shutil
import zipfile
from contextlib import suppress
from functools import lru_cache
from pathlib import Path
from typing import Container, Dict, Optional
from urllib.parse import urlparse
from defence360agent.contracts.config import ConfigFile
from defence360agent.subsys.panels.base import PanelException
from defence360agent.subsys.panels.directadmin.panel import get_user_domains
from defence360agent.utils import (
atomic_rewrite,
check_run,
ensure_line_in_file,
remove_line_from_file,
)
from im360.subsys.panels.base import (
APACHE,
LITESPEED,
MODSEC_NAME_TEMPLATE,
NGINX,
FilesVendor,
FilesVendorList,
ModSecSettingInterface,
ModSecurityInterface,
)
from defence360agent.subsys.web_server import (
apache_running,
check_with_timeout,
litespeed_running,
)
from .custombuild import CustomBuildOptions, build, custombuild2_only
logger = logging.getLogger(__name__)
MODSEC_CONF_DIR = "/etc/modsecurity.d"
RULESET_FILENAME = "I360_RULESET"
CB_MODSEC_CUSTOM_DIR = "/usr/local/directadmin/custombuild/custom/modsecurity"
CB_MODSEC_CUSTOM_CONF_DIR = os.path.join(CB_MODSEC_CUSTOM_DIR, "conf")
_BROKEN_CUSTOM_CONFIG_MSG = "User has a broken custom httpd config"
_DIRADMIN_USER = "diradmin"
_DIRECTADMIN_TASK_QUEUE = "/usr/local/directadmin/data/task.queue"
_WEBSERVER_RESTART_CHECK_TIMEOUT = 60
WEB_SERVER_CHECKS = {
APACHE: apache_running,
LITESPEED: litespeed_running,
}
SUPPORTED_WEB_SERVERS = WEB_SERVER_CHECKS.keys() # type: Container[str]
class DirectAdminModSecException(PanelException):
pass
async def run_cmd(cmd):
logger.debug("Running CMD: %s", cmd)
data = await check_run(cmd.split(), raise_exc=DirectAdminModSecException)
return data.decode().strip()
class ModSecSettings(ModSecSettingInterface):
INCLUDE_CONFIG = "/etc/httpd/conf/extra/httpd-includes.conf"
I360_INCLUDE = 'Include "/etc/httpd/conf/extra/modsec2.imunify.conf"'
config_key = "prev_settings"
@classmethod
async def revert(cls, **kwargs):
remove_line_from_file(cls.INCLUDE_CONFIG, cls.I360_INCLUDE)
# TODO: Revert SecRuleEngine value
@classmethod
async def apply(cls):
ensure_line_in_file(cls.INCLUDE_CONFIG, cls.I360_INCLUDE)
# TODO: Set SecRuleEngine value
@lru_cache(1)
def get_diradmin_pwnam():
return pwd.getpwnam(_DIRADMIN_USER)
def rewrite_httpd_config(user: str):
action = "action=rewrite&value=httpd&user={}\n".format(user)
with open(_DIRECTADMIN_TASK_QUEUE, "a") as queue:
queue.write(action)
async def get_custombuild_webserver():
web_server = CustomBuildOptions("webserver").get()
# NGINX is handling real requests in this combination proxying it to
# Apache as needed.
if web_server == "nginx_apache":
web_server = NGINX
return web_server
async def get_outer_web_server():
"""Return the name of the web server that handles incoming requests.
For the purposes of ModSecurity we are interested in the one web
server running on the machine that handles actual requests from
users. This is related to the usage of Nginx as a reverse proxy to
Apache.
"""
web_server = await get_custombuild_webserver()
if web_server in SUPPORTED_WEB_SERVERS:
return web_server
return None
class DirectAdminModSecurity(ModSecurityInterface):
GLOBAL_DISABLED_RULES_CONFIG = (
"/etc/httpd/conf/extra/i360_modsec_disable.conf"
)
GLOBAL_DISABLED_RULES_LINK = "zz_i360_modsec_disable.conf"
USER_INCLUDE_PATH_TMPL = (
"/usr/local/directadmin/data/users/{user}/domains/{domain}.cust_httpd"
)
USER_RULES_START_MARK = "# IMUNIFY360 CONFIG START"
USER_RULES_END_MARK = "# IMUNIFY360 CONFIG END"
CUSTOM_RULES_BACKUP = os.path.join(CB_MODSEC_CUSTOM_DIR, "conf.i360backup")
@classmethod
def _get_conf_dir(cls) -> str:
return MODSEC_CONF_DIR
@classmethod
def detect_cwaf(cls):
pass
CWAF_INSTALLATION_DIR = "/usr/local/cwaf"
@classmethod
async def sync_disabled_rules_for_domains(
cls, domain_rules_map: Dict[str, list]
):
for domain, rule_list in domain_rules_map.items():
user = get_user_domains().get(domain)
if user is None:
raise DirectAdminModSecException(
"Cannot find owner of domain " + domain
)
cls._write_user_custom_httpd_conf(user, domain, rule_list)
rewrite_httpd_config(user)
@classmethod
def _write_user_custom_httpd_conf(cls, user, domain, rule_list):
filename = cls.USER_INCLUDE_PATH_TMPL.format(user=user, domain=domain)
our_config = [cls.USER_RULES_START_MARK]
our_config.extend(
cls.generate_disabled_rules_config(rule_list).split("\n")
)
our_config.append(cls.USER_RULES_END_MARK)
uid, gid = get_diradmin_pwnam()[2:4]
if not os.path.isfile(filename):
with open(filename, "w") as cust_httpd:
os.chown(cust_httpd.fileno(), uid, gid)
content = []
with open(filename, "r") as cust_httpd:
lines = cust_httpd.read().split("\n")
start_idx = end_idx = None
try:
start_idx = lines.index(cls.USER_RULES_START_MARK)
end_idx = lines.index(cls.USER_RULES_END_MARK)
except ValueError:
pass
if start_idx is None and end_idx is None:
content = lines
content.extend(our_config)
elif (
start_idx is not None
and end_idx is not None
and start_idx < end_idx
):
content = lines[:]
content[start_idx : end_idx + 1] = our_config
else:
raise DirectAdminModSecException(_BROKEN_CUSTOM_CONFIG_MSG)
if content[-1] != "":
content.append("") # ensure newline at EOF
atomic_rewrite(
filename, "\n".join(content), backup=False, uid=uid, gid=gid
)
@classmethod
def write_global_disabled_rules(cls, rule_list):
"""
:param list rule_list: rule ids to sync
:return:
"""
atomic_rewrite(
cls.GLOBAL_DISABLED_RULES_CONFIG,
cls.generate_disabled_rules_config(rule_list),
backup=False,
)
cls._ensure_global_disabled_rules_link_present()
@classmethod
def _ensure_global_disabled_rules_link_present(cls):
linkname = os.path.join(
MODSEC_CONF_DIR, cls.GLOBAL_DISABLED_RULES_LINK
)
try:
os.remove(linkname)
except FileNotFoundError:
pass
os.symlink(cls.GLOBAL_DISABLED_RULES_CONFIG, linkname)
@classmethod
async def sync_global_disabled_rules(cls, rule_list):
"""
just alias to write_global_disabled_rules()
"""
cls.write_global_disabled_rules(rule_list)
@classmethod
def get_audit_log_path(cls):
return "/var/log/httpd/modsec_audit.log"
@classmethod
def get_audit_logdir_path(cls):
return "/var/log/modsec_audit"
@classmethod
async def installed_modsec(cls):
return CustomBuildOptions("modsecurity").get() == "yes"
@classmethod
async def _get_web_server(cls) -> Optional[str]:
"""
Return the name of the web server for which ModSecurity rules
will be applied.
"""
return await get_outer_web_server()
async def _rollback(self):
await DirectAdminFilesVendorList.revert()
CustomBuildOptions("modsecurity_ruleset").set("no")
await build("modsecurity_ruleset")
await self.revert_settings()
@custombuild2_only
async def _install_settings(self):
web_server = await self._get_web_server()
if web_server is None:
logger.warning(
"ModSecurity rules installation is not supported"
" for the running web server configuration."
)
return
prev_settings = CustomBuildOptions("modsecurity_ruleset").get()
# backup custom mod_security settings, if any
vendorlist = await DirectAdminModSecurity.modsec_vendor_list()
if "unknown_custom" in vendorlist and not os.path.exists(
self.CUSTOM_RULES_BACKUP
):
shutil.copytree(
CB_MODSEC_CUSTOM_CONF_DIR, self.CUSTOM_RULES_BACKUP
)
await ModSecSettings.apply()
await DirectAdminFilesVendorList.apply()
await build("modsecurity_ruleset")
config = ConfigFile()
config.set("MOD_SEC", ModSecSettings.config_key, prev_settings)
self._ensure_global_disabled_rules_link_present()
# checking if we did not break web server configuration
is_server_running = WEB_SERVER_CHECKS[web_server]
if not await check_with_timeout(
is_server_running, _WEBSERVER_RESTART_CHECK_TIMEOUT
):
await self._rollback()
logger.warning("Web server failed to start, settings reverted")
async def modsec_get_directive(self, directive_name, default=None):
raise NotImplementedError
async def reset_modsec_directives(self):
raise NotImplementedError
async def reset_modsec_rulesets(self):
raise NotImplementedError
@custombuild2_only
async def revert_settings(self):
if not await self.installed_modsec():
logger.warning(
"Skipping vendor removal, because ModSecurity isn't installed"
)
return
config = ConfigFile()
await ModSecSettings.revert()
await DirectAdminFilesVendorList.revert()
prev_settings = config.get("MOD_SEC", ModSecSettings.config_key)
if prev_settings in ("comodo", "owasp"):
CustomBuildOptions("modsecurity_ruleset").set(prev_settings)
if os.path.exists(self.CUSTOM_RULES_BACKUP):
shutil.rmtree(CB_MODSEC_CUSTOM_CONF_DIR)
os.rename(self.CUSTOM_RULES_BACKUP, CB_MODSEC_CUSTOM_CONF_DIR)
await build("modsecurity_ruleset")
config.set("MOD_SEC", ModSecSettings.config_key, None)
@classmethod
async def enabled_modsec_vendor_list(cls):
"""Return a list of enabled ModSecurity vendors."""
# seems that on DirectAdmin all rulesets are always enabled
return await cls.modsec_vendor_list()
@classmethod
async def modsec_vendor_list(cls):
"""Return a list of installed ModSecurity vendors."""
vendorlist = []
ruleset_file = os.path.join(MODSEC_CONF_DIR, RULESET_FILENAME)
if os.path.exists(ruleset_file):
# imunify360 ruleset installed
with open(ruleset_file) as f:
vendorlist.append(f.read())
elif os.path.isdir(CB_MODSEC_CUSTOM_CONF_DIR) and os.listdir(
CB_MODSEC_CUSTOM_CONF_DIR
):
vendorlist.append("unknown_custom")
ruleset = CustomBuildOptions("modsecurity_ruleset").get()
if ruleset and ruleset != "no":
vendorlist.append(ruleset)
return vendorlist
@classmethod
async def build_vendor_file_path(cls, vendor: str, filename: str) -> Path:
return Path(MODSEC_CONF_DIR) / filename
@classmethod
async def _apply_modsec_files_update(cls):
installed = await DirectAdminFilesVendorList.install_or_update()
# don't build modsecurity_ruleset if vendor is not installed
# to avoid DEF-5848
if installed:
await build("modsecurity_ruleset")
cls._ensure_global_disabled_rules_link_present()
class DirectAdminFilesVendor(FilesVendor):
modsec_interface = DirectAdminModSecurity
def _add_vendor(self, url, name, *args, **kwargs):
pass
async def _remove_vendor(self, vendor, *args, **kwargs):
with suppress(FileNotFoundError):
shutil.rmtree(CB_MODSEC_CUSTOM_CONF_DIR)
os.makedirs(CB_MODSEC_CUSTOM_CONF_DIR, exist_ok=True)
async def apply(self):
shutil.rmtree(CB_MODSEC_CUSTOM_CONF_DIR, ignore_errors=True)
os.makedirs(CB_MODSEC_CUSTOM_CONF_DIR, exist_ok=True)
with zipfile.ZipFile(self._item["local_path"]) as zf:
for member in zf.namelist():
filename = os.path.basename(member)
if not filename:
continue
target = os.path.join(CB_MODSEC_CUSTOM_CONF_DIR, filename)
with zf.open(member) as src, open(target, "wb") as dst:
shutil.copyfileobj(src, dst)
with suppress(FileNotFoundError):
os.unlink(
os.path.join(CB_MODSEC_CUSTOM_CONF_DIR, "rules.conf.main")
)
with open(
os.path.join(CB_MODSEC_CUSTOM_CONF_DIR, RULESET_FILENAME), "w"
) as f:
f.write(self._vendor_id())
CustomBuildOptions("modsecurity_ruleset").set("no")
await build("modsecurity_ruleset")
def _vendor_id(self):
basename = os.path.basename(urlparse(self._item["url"]).path)
basename_no_zip, _ = os.path.splitext(basename)
return basename_no_zip
class DirectAdminFilesVendorList(FilesVendorList):
files_vendor = DirectAdminFilesVendor
modsec_interface = DirectAdminModSecurity
@classmethod
def vendor_fit_panel(cls, item):
return item["name"].endswith("plesk")
@classmethod
async def _get_compatible_name(cls, installed_vendors):
web_server = await get_outer_web_server()
if web_server is None:
raise cls.CompatiblityCheckFailed(
"Imunify360 mod_security vendor does not support"
" a running web server"
)
return MODSEC_NAME_TEMPLATE.format(
ruleset_suffix=cls.get_ruleset_suffix(),
webserver=web_server,
panel="plesk",
)