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fixperms_cpanel.py
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"""Fixperms class for cPanel""" import os import re from shlex import quote, join as cmd_join from subprocess import CalledProcessError, check_call from stat import S_ISLNK, S_ISREG, S_ISDIR import rads from fixperms_base import PermMap from fixperms_cli import Args from fixperms_ids import IDCache class CpanelPermMap(PermMap): """Fixperms class for cPanel""" def __init__(self, ids: IDCache, args: Args, user: str): super().__init__( ids=ids, args=args, user=user, all_docroots=rads.UserData(user).all_roots, docroot_chmod=0o750, docroot_chown=(user, 'nobody'), ) self.is_shared = rads.IMH_ROLE == 'shared' # always skip ~/etc and ~/mail in the main os.walk - that's what # self.mailperms is for self.skip.add(os.path.join(self.homedir, 'mail')) self.skip.add(os.path.join(self.homedir, 'etc')) self.bad_links = [] # pylint: disable=duplicate-code # Order these rules more specific to less specific regex. uid, gid = self.uid, self.gid # sensitive passwords: ~/.accesshash, ~/.pgpass, ~/.my.cnf self.add_rule( r"\/\.(?:accesshash|pgpass|my\.cnf)$", (0o600, None), (uid, gid) ) # ~/.imh/nginx - ngxconf & cache manager files self.add_rule(r"\/\.imh\/nginx(?:$|\/)", (0o664, 0o775), (uid, gid)) # ~/.imh directory and contents self.add_rule(r"\/\.imh(?:$|\/)", (0o644, 0o755), (0, 0)) # ~/.ssh directory and contents self.add_rule(r"\/\.ssh(?:$|\/)", (0o600, 0o700), (uid, gid)) # ~/.pki dir and subdirs self.add_rule(r"\/\.pki(?:$|\/)", (None, 0o740), (uid, gid)) # .cgi and .pl files self.add_rule(r"\/.*\.(?:pl|cgi)$", (0o755, None), (uid, gid)) # homedir folder itself self.add_rule("$", (None, 0o711), (uid, gid)) # restrict access to sensitive CMS config files self.add_rule( r"\/.+\/(?:(?:wp-config|conf|[cC]onfig|[cC]onfiguration|" r"LocalSettings|settings)(?:\.inc)?\.php|" r"local\.xml|mt-config\.cgi)$", (0o640, None), (uid, gid), ) # contents of homedir which do not match a previous regex self.add_rule(r"\/", (0o644, 0o755), (uid, gid)) # full path to symlink sources which are safe self.safe_link_src = { os.path.join(self.homedir, '.cphorde/meta/latest'), os.path.join(self.homedir, 'www'), } # regex for symlink sources which are safe safe_link_src_re = [ fr'(?:{self.home_re}\/(?:etc|mail|logs)\/)', r'(?:.*\/\.ea-php-cli\.cache$)', ] self.safe_link_src_re = re.compile('|'.join(safe_link_src_re)) # full path to symlink destinations which are safe self.safe_link_dest = { self.homedir, os.path.join('/usr/local/apache/domlogs', self.user), os.path.join('/etc/apache2/logs/domlogs', self.user), os.path.join('/var/log/apache2/domlogs', self.user), '/home/shrusr/SharedHtDocsDir', '/var/lib/mysql/mysql.sock', '/var/run/postgres/.s.PGSQL.5432', '/run/postgres/.s.PGSQL.5432', '/usr/local/cpanel/base/frontend/paper_lantern/styled/retro', } def link_unsafe(self, path: str) -> bool: """Determine if a symlink is "unsafe" for a shared server""" if not self.is_shared: return False if path in self.safe_link_src: return False if os.path.realpath(path) in self.safe_link_dest: return False if self.safe_link_src_re.match(path): return False bad_link = f'{quote(path)} -> {quote(os.readlink(path))}' self.bad_links.append(bad_link) self.log.warning('Potentially malicious symlink detected: %s', bad_link) os.unlink(path) return True def mailperms(self): """Run /scripts/mailperm""" if self.args.skip_mail: return self.mailperm_fix('mail', self.gid) self.mailperm_fix('etc', self.ids.getgrnam('mail').gr_gid) cmd_args = [ '/usr/local/cpanel/scripts/mailperm', '--skiplocaldomains', '--skipmxcheck', self.user, ] self.log.debug('Running: %s', cmd_join(cmd_args)) if self.args.noop: return try: check_call(cmd_args) except (CalledProcessError, OSError): self.log.error('Error running: %s', cmd_join(cmd_args)) raise def fix_cpanel_db_files(self): """Fix ownership/permissions on /var/cpanel/databases/ files""" db_dir = '/var/cpanel/databases' # (filename, uid, gid, mode) targets = [ (f'{self.user}.json', 0, self.gid, 0o640), (f'grants_{self.user}.yaml', 0, 0, 0o600), (f'grants_{self.user}.cache', 0, 0, 0o600), ] for filename, uid, gid, mode in targets: path = os.path.join(db_dir, filename) try: stat = os.lstat(path) except FileNotFoundError: self.log.debug( '%s does not exist, skipping', path ) continue except OSError as exc: self.log.error(exc) continue self.lchown(path, stat, uid, gid) self.lchmod(path, stat, mode) def fixperms(self) -> None: super().fixperms() self.send_str() self.mailperms() self.fix_cpanel_db_files() def check_path(self, stat: os.stat_result, path: str): if S_ISLNK(stat.st_mode) and self.link_unsafe(path): return super().check_path(stat, path) def mailperm_fix(self, subdir: str, dir_gid: int): """Fix permissions not caught by cPanel's mailperm script""" top_dir = os.path.join(self.homedir, subdir) mail_gid = self.ids.getgrnam('mail').gr_gid dir_gids = {self.gid, dir_gid} for stat, path in self.walk(top_dir, ignore_skips=True): if S_ISREG(stat.st_mode): # path is a regular file if stat.st_gid in (self.gid, mail_gid): gid = -1 else: gid = self.gid if self.uid != stat.st_uid and stat.st_nlink > 1: self.hard_links.add(path, stat, (self.uid, gid), None) continue self.lchown(path, stat, self.uid, gid) elif S_ISDIR(stat.st_mode): # path is a directory # for each directory with a group not set to the user or mail # chgrp to user:mail if ~/etc, user:user if ~/mail if stat.st_gid in dir_gids: self.lchown(path, stat, self.uid, -1) else: self.lchown(path, stat, self.uid, dir_gid) elif S_ISLNK(stat.st_mode): # path is a symlink if self.link_unsafe(path): continue self.lchown(path, stat, self.uid, self.gid) else: # path is socket/device/fifo/etc self.log.warning("Skipping unexpected path type at %s", path) continue def send_str(self): """Send an email to str@imhadmin.net if malicious symlinks are found""" if not self.bad_links: return bad_links = "\n".join(self.bad_links) top = ( "Fixperms detected and removed the following symlinks. While these " "symlinks have been removed from the account in question the " "account requires further investigation" ) self.log.info("An STR will now be sent for review by T2S staff") if self.args.noop: return try: rads.send_email( to_addr='str@imhadmin.net', subject=f'AUTO STR: bad symlinks on {self.user}', body=f'{top}\n\n{bad_links}', errs=True, ) except OSError as exc: self.log.error(str(exc)) self.log.info( "Failed to send STR. An escalation must be sent to an", "available T2S. Include the following information\n\n", bad_links, )