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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 . # __all__ = [ "Helper", "helper_reader", "helper_writer" ] 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, check_port, \ check_tcpudp from firewall.core.logger import log from firewall import errors from firewall.errors import FirewallError class Helper(IO_Object): IMPORT_EXPORT_STRUCTURE = ( ( "version", "" ), # s ( "short", "" ), # s ( "description", "" ), # s ( "family", "", ), # s ( "module", "", ), # s ( "ports", [ ( "", "" ), ], ), # a(ss) ) DBUS_SIGNATURE = '(sssssa(ss))' ADDITIONAL_ALNUM_CHARS = [ "-", "." ] PARSER_REQUIRED_ELEMENT_ATTRS = { "short": None, "description": None, "helper": [ "module" ], } PARSER_OPTIONAL_ELEMENT_ATTRS = { "helper": [ "name", "version", "family" ], "port": [ "port", "protocol" ], } def __init__(self): super(Helper, self).__init__() self.version = "" self.short = "" self.description = "" self.module = "" self.family = "" self.ports = [ ] def cleanup(self): self.version = "" self.short = "" self.description = "" self.module = "" self.family = "" del self.ports[:] def check_ipv(self, ipv): ipvs = [ 'ipv4', 'ipv6' ] if ipv not in ipvs: raise FirewallError(errors.INVALID_IPV, "'%s' not in '%s'" % (ipv, ipvs)) def _check_config(self, config, item, all_config, all_io_objects): if item == "ports": for port in config: check_port(port[0]) check_tcpudp(port[1]) elif item == "module": if not config.startswith("nf_conntrack_"): raise FirewallError( errors.INVALID_MODULE, "'%s' does not start with 'nf_conntrack_'" % config) if len(config.replace("nf_conntrack_", "")) < 1: raise FirewallError(errors.INVALID_MODULE, "Module name '%s' too short" % config) # PARSER class helper_ContentHandler(IO_Object_ContentHandler): def startElement(self, name, attrs): IO_Object_ContentHandler.startElement(self, name, attrs) self.item.parser_check_element_attrs(name, attrs) if name == "helper": if "version" in attrs: self.item.version = attrs["version"] if "family" in attrs: self.item.check_ipv(attrs["family"]) self.item.family = attrs["family"] if "module" in attrs: if not attrs["module"].startswith("nf_conntrack_"): raise FirewallError( errors.INVALID_MODULE, "'%s' does not start with 'nf_conntrack_'" % \ attrs["module"]) if len(attrs["module"].replace("nf_conntrack_", "")) < 1: raise FirewallError( errors.INVALID_MODULE, "Module name '%s' too short" % attrs["module"]) self.item.module = attrs["module"] elif name == "short": pass elif name == "description": pass elif name == "port": check_port(attrs["port"]) check_tcpudp(attrs["protocol"]) entry = (attrs["port"], attrs["protocol"]) if entry not in self.item.ports: self.item.ports.append(entry) else: log.warning("Port '%s/%s' already set, ignoring.", attrs["port"], attrs["protocol"]) def helper_reader(filename, path): helper = Helper() if not filename.endswith(".xml"): raise FirewallError(errors.INVALID_NAME, "'%s' is missing .xml suffix" % filename) helper.name = filename[:-4] helper.check_name(helper.name) helper.filename = filename helper.path = path helper.builtin = False if path.startswith(config.ETC_FIREWALLD) else True helper.default = helper.builtin handler = helper_ContentHandler(helper) parser = sax.make_parser() parser.setContentHandler(handler) name = "%s/%s" % (path, filename) with open(name, "rb") as f: source = sax.InputSource(None) source.setByteStream(f) try: parser.parse(source) except sax.SAXParseException as msg: raise FirewallError(errors.INVALID_HELPER, "not a valid helper file: %s" % \ msg.getException()) del handler del parser return helper def helper_writer(helper, path=None): _path = path if path else helper.path if helper.filename: name = "%s/%s" % (_path, helper.filename) else: name = "%s/%s.xml" % (_path, helper.name) if os.path.exists(name): try: shutil.copy2(name, "%s.old" % name) except Exception as msg: log.error("Backup of file '%s' failed: %s", name, msg) dirpath = os.path.dirname(name) if dirpath.startswith(config.ETC_FIREWALLD) and not os.path.exists(dirpath): if not os.path.exists(config.ETC_FIREWALLD): os.mkdir(config.ETC_FIREWALLD, 0o750) os.mkdir(dirpath, 0o750) f = io.open(name, mode='wt', encoding='UTF-8') handler = IO_Object_XMLGenerator(f) handler.startDocument() # start helper element attrs = {} attrs["module"] = helper.module if helper.version and helper.version != "": attrs["version"] = helper.version if helper.family and helper.family != "": attrs["family"] = helper.family handler.startElement("helper", attrs) handler.ignorableWhitespace("\n") # short if helper.short and helper.short != "": handler.ignorableWhitespace(" ") handler.startElement("short", { }) handler.characters(helper.short) handler.endElement("short") handler.ignorableWhitespace("\n") # description if helper.description and helper.description != "": handler.ignorableWhitespace(" ") handler.startElement("description", { }) handler.characters(helper.description) handler.endElement("description") handler.ignorableWhitespace("\n") # ports for port in helper.ports: handler.ignorableWhitespace(" ") handler.simpleElement("port", { "port": port[0], "protocol": port[1] }) handler.ignorableWhitespace("\n") # end helper element handler.endElement('helper') handler.ignorableWhitespace("\n") handler.endDocument() f.close() del handler