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# -*- coding: utf-8 -*- # # Copyright (C) 2011-2016 Red Hat, Inc. # # Authors: # Thomas Woerner # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . # import xml.sax as sax import os import io import shutil from firewall import config from firewall.core.io.io_object import IO_Object, \ IO_Object_ContentHandler, IO_Object_XMLGenerator from firewall.core.logger import log from firewall.functions import uniqify, checkUser, checkUid, checkCommand, \ checkContext from firewall import errors from firewall.errors import FirewallError class lockdown_whitelist_ContentHandler(IO_Object_ContentHandler): def __init__(self, item): IO_Object_ContentHandler.__init__(self, item) self.whitelist = False def startElement(self, name, attrs): IO_Object_ContentHandler.startElement(self, name, attrs) self.item.parser_check_element_attrs(name, attrs) if name == "whitelist": if self.whitelist: raise FirewallError(errors.PARSE_ERROR, "More than one whitelist.") self.whitelist = True elif name == "command": if not self.whitelist: log.error("Parse Error: command outside of whitelist") return command = attrs["name"] self.item.add_command(command) elif name == "user": if not self.whitelist: log.error("Parse Error: user outside of whitelist") return if "id" in attrs: try: uid = int(attrs["id"]) except ValueError: log.error("Parse Error: %s is not a valid uid" % attrs["id"]) return self.item.add_uid(uid) elif "name" in attrs: self.item.add_user(attrs["name"]) elif name == "selinux": if not self.whitelist: log.error("Parse Error: selinux outside of whitelist") return if "context" not in attrs: log.error("Parse Error: no context") return self.item.add_context(attrs["context"]) else: log.error('Unknown XML element %s' % name) return class LockdownWhitelist(IO_Object): """ LockdownWhitelist class """ IMPORT_EXPORT_STRUCTURE = ( ( "commands", [ "" ] ), # as ( "contexts", [ "" ] ), # as ( "users", [ "" ] ), # as ( "uids", [ 0 ] ) # ai ) DBUS_SIGNATURE = '(asasasai)' ADDITIONAL_ALNUM_CHARS = [ "_" ] PARSER_REQUIRED_ELEMENT_ATTRS = { "whitelist": None, "command": [ "name" ], "user": None, # "group": None, "selinux": [ "context" ], } PARSER_OPTIONAL_ELEMENT_ATTRS = { "user": [ "id", "name" ], # "group": [ "id", "name" ], } def __init__(self, filename): super(LockdownWhitelist, self).__init__() self.filename = filename self.parser = None self.commands = [ ] self.contexts = [ ] self.users = [ ] self.uids = [ ] # self.gids = [ ] # self.groups = [ ] def _check_config(self, config, item, all_config, all_io_objects): if item in [ "commands", "contexts", "users", "uids" ]: for x in config: self._check_config(x, item[:-1], all_config, all_io_objects) elif item == "command": if not checkCommand(config): raise FirewallError(errors.INVALID_COMMAND, config) elif item == "context": if not checkContext(config): raise FirewallError(errors.INVALID_CONTEXT, config) elif item == "user": if not checkUser(config): raise FirewallError(errors.INVALID_USER, config) elif item == "uid": if not checkUid(config): raise FirewallError(errors.INVALID_UID, config) def cleanup(self): del self.commands[:] del self.contexts[:] del self.users[:] del self.uids[:] # del self.gids[:] # del self.groups[:] # commands def add_command(self, command): if not checkCommand(command): raise FirewallError(errors.INVALID_COMMAND, command) if command not in self.commands: self.commands.append(command) else: raise FirewallError(errors.ALREADY_ENABLED, 'Command "%s" already in whitelist' % command) def remove_command(self, command): if command in self.commands: self.commands.remove(command) else: raise FirewallError(errors.NOT_ENABLED, 'Command "%s" not in whitelist.' % command) def has_command(self, command): return (command in self.commands) def match_command(self, command): for _command in self.commands: if _command.endswith("*"): if command.startswith(_command[:-1]): return True else: if _command == command: return True return False def get_commands(self): return self.commands # user ids def add_uid(self, uid): if not checkUid(uid): raise FirewallError(errors.INVALID_UID, str(uid)) if uid not in self.uids: self.uids.append(uid) else: raise FirewallError(errors.ALREADY_ENABLED, 'Uid "%s" already in whitelist' % uid) def remove_uid(self, uid): if uid in self.uids: self.uids.remove(uid) else: raise FirewallError(errors.NOT_ENABLED, 'Uid "%s" not in whitelist.' % uid) def has_uid(self, uid): return (uid in self.uids) def match_uid(self, uid): return (uid in self.uids) def get_uids(self): return self.uids # users def add_user(self, user): if not checkUser(user): raise FirewallError(errors.INVALID_USER, user) if user not in self.users: self.users.append(user) else: raise FirewallError(errors.ALREADY_ENABLED, 'User "%s" already in whitelist' % user) def remove_user(self, user): if user in self.users: self.users.remove(user) else: raise FirewallError(errors.NOT_ENABLED, 'User "%s" not in whitelist.' % user) def has_user(self, user): return (user in self.users) def match_user(self, user): return (user in self.users) def get_users(self): return self.users # # group ids # # def add_gid(self, gid): # if gid not in self.gids: # self.gids.append(gid) # # def remove_gid(self, gid): # if gid in self.gids: # self.gids.remove(gid) # else: # raise FirewallError(errors.NOT_ENABLED, # 'Gid "%s" not in whitelist.' % gid) # # def has_gid(self, gid): # return (gid in self.gids) # # def match_gid(self, gid): # return (gid in self.gids) # # def get_gids(self): # return self.gids # # groups # # def add_group(self, group): # if group not in self.groups: # self.groups.append(group) # # def remove_group(self, group): # if group in self.groups: # self.groups.remove(group) # else: # raise FirewallError(errors.NOT_ENABLED, # 'Group "%s" not in whitelist.' % group) # # def has_group(self, group): # return (group in self.groups) # # def match_group(self, group): # return (group in self.groups) # # def get_groups(self): # return self.groups # selinux contexts def add_context(self, context): if not checkContext(context): raise FirewallError(errors.INVALID_CONTEXT, context) if context not in self.contexts: self.contexts.append(context) else: raise FirewallError(errors.ALREADY_ENABLED, 'Context "%s" already in whitelist' % context) def remove_context(self, context): if context in self.contexts: self.contexts.remove(context) else: raise FirewallError(errors.NOT_ENABLED, 'Context "%s" not in whitelist.' % context) def has_context(self, context): return (context in self.contexts) def match_context(self, context): return (context in self.contexts) def get_contexts(self): return self.contexts # read and write def read(self): self.cleanup() if not self.filename.endswith(".xml"): raise FirewallError(errors.INVALID_NAME, "'%s' is missing .xml suffix" % self.filename) handler = lockdown_whitelist_ContentHandler(self) parser = sax.make_parser() parser.setContentHandler(handler) try: parser.parse(self.filename) except sax.SAXParseException as msg: raise FirewallError(errors.INVALID_TYPE, "Not a valid file: %s" % \ msg.getException()) del handler del parser def write(self): if os.path.exists(self.filename): try: shutil.copy2(self.filename, "%s.old" % self.filename) except Exception as msg: raise IOError("Backup of '%s' failed: %s" % (self.filename, msg)) if not os.path.exists(config.ETC_FIREWALLD): os.mkdir(config.ETC_FIREWALLD, 0o750) f = io.open(self.filename, mode='wt', encoding='UTF-8') handler = IO_Object_XMLGenerator(f) handler.startDocument() # start whitelist element handler.startElement("whitelist", { }) handler.ignorableWhitespace("\n") # commands for command in uniqify(self.commands): handler.ignorableWhitespace(" ") handler.simpleElement("command", { "name": command }) handler.ignorableWhitespace("\n") for uid in uniqify(self.uids): handler.ignorableWhitespace(" ") handler.simpleElement("user", { "id": str(uid) }) handler.ignorableWhitespace("\n") for user in uniqify(self.users): handler.ignorableWhitespace(" ") handler.simpleElement("user", { "name": user }) handler.ignorableWhitespace("\n") # for gid in uniqify(self.gids): # handler.ignorableWhitespace(" ") # handler.simpleElement("user", { "id": str(gid) }) # handler.ignorableWhitespace("\n") # for group in uniqify(self.groups): # handler.ignorableWhitespace(" ") # handler.simpleElement("group", { "name": group }) # handler.ignorableWhitespace("\n") for context in uniqify(self.contexts): handler.ignorableWhitespace(" ") handler.simpleElement("selinux", { "context": context }) handler.ignorableWhitespace("\n") # end whitelist element handler.endElement("whitelist") handler.ignorableWhitespace("\n") handler.endDocument() f.close() del handler