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# -- coding: utf-8 -- # # Copyright (C) 2011-2016 Red Hat, Inc. # # Authors: # Thomas Woerner <twoerner@redhat.com> # # 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 <http://www.gnu.org/licenses/>. # __all__ = [ "Service", "service_reader", "service_writer" ] import xml.sax as sax import os import io import shutil from firewall import config from firewall.functions import u2b_if_py2 from firewall.core.io.io_object import PY2, IO_Object, \ IO_Object_ContentHandler, IO_Object_XMLGenerator, check_port, \ check_tcpudp, check_protocol, check_address from firewall.core.logger import log from firewall import errors from firewall.errors import FirewallError class Service(IO_Object): IMPORT_EXPORT_STRUCTURE = ( ( "version", "" ), ( "short", "" ), ( "description", "" ), ( "ports", [ ( "", "" ), ], ), ( "modules", [ "", ], ), ( "destination", { "": "", }, ), ( "protocols", [ "", ], ), ( "source_ports", [ ( "", "" ), ], ), ( "includes", [ "" ], ), ( "helpers", [ "", ], ), ) ADDITIONAL_ALNUM_CHARS = [ "_", "-" ] PARSER_REQUIRED_ELEMENT_ATTRS = { "short": None, "description": None, "service": None, } PARSER_OPTIONAL_ELEMENT_ATTRS = { "service": [ "name", "version" ], "port": [ "port", "protocol" ], "protocol": [ "value" ], "module": [ "name" ], "destination": [ "ipv4", "ipv6" ], "source-port": [ "port", "protocol" ], "include": [ "service" ], "helper": [ "name" ], } def __init__(self): super(Service, self).__init__() self.version = "" self.short = "" self.description = "" self.ports = [ ] self.protocols = [ ] self.modules = [ ] self.destination = { } self.source_ports = [ ] self.includes = [ ] self.helpers = [ ] def cleanup(self): self.version = "" self.short = "" self.description = "" del self.ports[:] del self.protocols[:] del self.modules[:] self.destination.clear() del self.source_ports[:] del self.includes[:] del self.helpers[:] def encode_strings(self): """ HACK. I haven't been able to make sax parser return strings encoded (because of python 2) instead of in unicode. Get rid of it once we throw out python 2 support.""" self.version = u2b_if_py2(self.version) self.short = u2b_if_py2(self.short) self.description = u2b_if_py2(self.description) self.ports = [(u2b_if_py2(po),u2b_if_py2(pr)) for (po,pr) in self.ports] self.modules = [u2b_if_py2(m) for m in self.modules] self.destination = {u2b_if_py2(k):u2b_if_py2(v) for k,v in self.destination.items()} self.protocols = [u2b_if_py2(pr) for pr in self.protocols] self.source_ports = [(u2b_if_py2(po),u2b_if_py2(pr)) for (po,pr) in self.source_ports] self.includes = [u2b_if_py2(s) for s in self.includes] self.helpers = [u2b_if_py2(s) for s in self.helpers] def _check_config(self, config, item, all_config): if item == "ports": for port in config: if port[0] != "": check_port(port[0]) check_tcpudp(port[1]) else: # only protocol check_protocol(port[1]) elif item == "protocols": for proto in config: check_protocol(proto) elif item == "source_ports": for port in config: check_port(port[0]) check_tcpudp(port[1]) elif item == "destination": for destination in config: if destination not in [ "ipv4", "ipv6" ]: raise FirewallError(errors.INVALID_DESTINATION, "'%s' not in {'ipv4'\|'ipv6'}" % \ destination) check_address(destination, config[destination]) elif item == "modules": for module in config: if module.startswith("nf_conntrack_"): module = module.replace("nf_conntrack_", "") if "_" in module: module = module.replace("_", "-") if len(module) < 2: raise FirewallError(errors.INVALID_MODULE, module) # PARSER class service_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 == "service": if "name" in attrs: log.warning("Ignoring deprecated attribute name='%s'", attrs["name"]) if "version" in attrs: self.item.version = attrs["version"] elif name == "short": pass elif name == "description": pass elif name == "port": if attrs["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"]) else: check_protocol(attrs["protocol"]) if attrs["protocol"] not in self.item.protocols: self.item.protocols.append(attrs["protocol"]) else: log.warning("Protocol '%s' already set, ignoring.", attrs["protocol"]) elif name == "protocol": check_protocol(attrs["value"]) if attrs["value"] not in self.item.protocols: self.item.protocols.append(attrs["value"]) else: log.warning("Protocol '%s' already set, ignoring.", attrs["value"]) elif name == "source-port": check_port(attrs["port"]) check_tcpudp(attrs["protocol"]) entry = (attrs["port"], attrs["protocol"]) if entry not in self.item.source_ports: self.item.source_ports.append(entry) else: log.warning("SourcePort '%s/%s' already set, ignoring.", attrs["port"], attrs["protocol"]) elif name == "destination": for x in [ "ipv4", "ipv6" ]: if x in attrs: check_address(x, attrs[x]) if x in self.item.destination: log.warning("Destination address for '%s' already set, ignoring", x) else: self.item.destination[x] = attrs[x] elif name == "module": module = attrs["name"] if module.startswith("nf_conntrack_"): module = module.replace("nf_conntrack_", "") if "_" in module: module = module.replace("_", "-") if module not in self.item.modules: self.item.modules.append(module) else: log.warning("Module '%s' already set, ignoring.", module) elif name == "include": if attrs["service"] not in self.item.includes: self.item.includes.append(attrs["service"]) else: log.warning("Include '%s' already set, ignoring.", attrs["service"]) elif name == "helper": if attrs["name"] not in self.item.helpers: self.item.helpers.append(attrs["name"]) else: log.warning("Helper '%s' already set, ignoring.", attrs["name"]) def service_reader(filename, path): service = Service() if not filename.endswith(".xml"): raise FirewallError(errors.INVALID_NAME, "'%s' is missing .xml suffix" % filename) service.name = filename[:-4] service.check_name(service.name) service.filename = filename service.path = path service.builtin = False if path.startswith(config.ETC_FIREWALLD) else True service.default = service.builtin handler = service_ContentHandler(service) 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_SERVICE, "not a valid service file: %s" % \ msg.getException()) del handler del parser if PY2: service.encode_strings() return service def service_writer(service, path=None): _path = path if path else service.path if service.filename: name = "%s/%s" % (_path, service.filename) else: name = "%s/%s.xml" % (_path, service.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 service element attrs = {} if service.version and service.version != "": attrs["version"] = service.version handler.startElement("service", attrs) handler.ignorableWhitespace("\n") # short if service.short and service.short != "": handler.ignorableWhitespace(" ") handler.startElement("short", { }) handler.characters(service.short) handler.endElement("short") handler.ignorableWhitespace("\n") # description if service.description and service.description != "": handler.ignorableWhitespace(" ") handler.startElement("description", { }) handler.characters(service.description) handler.endElement("description") handler.ignorableWhitespace("\n") # ports for port in service.ports: handler.ignorableWhitespace(" ") handler.simpleElement("port", { "port": port[0], "protocol": port[1] }) handler.ignorableWhitespace("\n") # protocols for protocol in service.protocols: handler.ignorableWhitespace(" ") handler.simpleElement("protocol", { "value": protocol }) handler.ignorableWhitespace("\n") # source ports for port in service.source_ports: handler.ignorableWhitespace(" ") handler.simpleElement("source-port", { "port": port[0], "protocol": port[1] }) handler.ignorableWhitespace("\n") # modules for module in service.modules: handler.ignorableWhitespace(" ") handler.simpleElement("module", { "name": module }) handler.ignorableWhitespace("\n") # destination if len(service.destination) > 0: handler.ignorableWhitespace(" ") handler.simpleElement("destination", service.destination) handler.ignorableWhitespace("\n") # includes for include in service.includes: handler.ignorableWhitespace(" ") handler.simpleElement("include", { "service": include }) handler.ignorableWhitespace("\n") # helpers for helper in service.helpers: handler.ignorableWhitespace(" ") handler.simpleElement("helper", { "name": helper }) handler.ignorableWhitespace("\n") # end service element handler.endElement('service') handler.ignorableWhitespace("\n") handler.endDocument() f.close() del handler

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