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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 . # """Generic io_object handler, io specific check methods.""" __all__ = [ "IO_Object", "IO_Object_ContentHandler", "IO_Object_XMLGenerator", "check_port", "check_tcpudp", "check_protocol", "check_address" ] import xml.sax as sax import xml.sax.saxutils as saxutils import copy from collections import OrderedDict from firewall import functions from firewall import errors from firewall.errors import FirewallError class IO_Object(object): """ Abstract IO_Object as base for icmptype, service and zone """ IMPORT_EXPORT_STRUCTURE = ( ) DBUS_SIGNATURE = '()' ADDITIONAL_ALNUM_CHARS = [ ] # additional to alnum PARSER_REQUIRED_ELEMENT_ATTRS = { } PARSER_OPTIONAL_ELEMENT_ATTRS = { } def __init__(self): self.filename = "" self.path = "" self.name = "" self.default = False self.builtin = False def export_config(self): ret = [ ] for x in self.IMPORT_EXPORT_STRUCTURE: ret.append(copy.deepcopy(getattr(self, x[0]))) return tuple(ret) def export_config_dict(self): conf = {} type_formats = dict([(x[0], x[1]) for x in self.IMPORT_EXPORT_STRUCTURE]) for key in type_formats: if getattr(self, key) or isinstance(getattr(self, key), bool): conf[key] = copy.deepcopy(getattr(self, key)) return conf def import_config(self, conf, all_io_objects): self.check_config(conf, all_io_objects) for i,(element,dummy) in enumerate(self.IMPORT_EXPORT_STRUCTURE): if isinstance(conf[i], list): # remove duplicates without changing the order _conf = [ ] _set = set() for x in conf[i]: if x not in _set: _conf.append(x) _set.add(x) del _set setattr(self, element, copy.deepcopy(_conf)) else: setattr(self, element, copy.deepcopy(conf[i])) def import_config_dict(self, conf, all_io_objects): self.check_config_dict(conf, all_io_objects) for key in conf: if not hasattr(self, key): raise FirewallError(errors.UNKNOWN_ERROR, "Internal error. '{}' is not a valid attribute".format(key)) if isinstance(conf[key], list): # maintain list order while removing duplicates setattr(self, key, list(OrderedDict.fromkeys(copy.deepcopy(conf[key])))) else: setattr(self, key, copy.deepcopy(conf[key])) def check_name(self, name): if not isinstance(name, str): raise FirewallError(errors.INVALID_TYPE, "'%s' not of type %s, but %s" % (name, type(""), type(name))) if len(name) < 1: raise FirewallError(errors.INVALID_NAME, "name can't be empty") for char in name: if not char.isalnum() and char not in self.ADDITIONAL_ALNUM_CHARS: raise FirewallError( errors.INVALID_NAME, "'%s' is not allowed in '%s'" % ((char, name))) def check_config(self, conf, all_io_objects={}): if len(conf) != len(self.IMPORT_EXPORT_STRUCTURE): raise FirewallError( errors.INVALID_TYPE, "structure size mismatch %d != %d" % \ (len(conf), len(self.IMPORT_EXPORT_STRUCTURE))) conf_dict = {} for i,(x,y) in enumerate(self.IMPORT_EXPORT_STRUCTURE): conf_dict[x] = conf[i] self.check_config_dict(conf_dict, all_io_objects) def check_config_dict(self, conf, all_io_objects): type_formats = dict([(x[0], x[1]) for x in self.IMPORT_EXPORT_STRUCTURE]) for key in conf: if key not in [x for (x,y) in self.IMPORT_EXPORT_STRUCTURE]: raise FirewallError(errors.INVALID_OPTION, "option '{}' is not valid".format(key)) self._check_config_structure(conf[key], type_formats[key]) self._check_config(conf[key], key, conf, all_io_objects) def _check_config(self, dummy1, dummy2, dummy3, dummy4): # to be overloaded by sub classes return def _check_config_structure(self, conf, structure): if not isinstance(conf, type(structure)): raise FirewallError(errors.INVALID_TYPE, "'%s' not of type %s, but %s" % \ (conf, type(structure), type(conf))) if isinstance(structure, list): # same type elements, else struct if len(structure) != 1: raise FirewallError(errors.INVALID_TYPE, "len('%s') != 1" % structure) for x in conf: self._check_config_structure(x, structure[0]) elif isinstance(structure, tuple): if len(structure) != len(conf): raise FirewallError(errors.INVALID_TYPE, "len('%s') != %d" % (conf, len(structure))) for i,value in enumerate(structure): self._check_config_structure(conf[i], value) elif isinstance(structure, dict): # only one key value pair in structure (skey, svalue) = list(structure.items())[0] for (key, value) in conf.items(): if not isinstance(key, type(skey)): raise FirewallError(errors.INVALID_TYPE, "'%s' not of type %s, but %s" % (\ key, type(skey), type(key))) if not isinstance(value, type(svalue)): raise FirewallError(errors.INVALID_TYPE, "'%s' not of type %s, but %s" % (\ value, type(svalue), type(value))) # check required elements and attributes and also optional attributes def parser_check_element_attrs(self, name, attrs): _attrs = attrs.getNames() found = False if name in self.PARSER_REQUIRED_ELEMENT_ATTRS: found = True if self.PARSER_REQUIRED_ELEMENT_ATTRS[name] is not None: for x in self.PARSER_REQUIRED_ELEMENT_ATTRS[name]: if x in _attrs: _attrs.remove(x) else: raise FirewallError( errors.PARSE_ERROR, "Missing attribute %s for %s" % (x, name)) if name in self.PARSER_OPTIONAL_ELEMENT_ATTRS: found = True for x in self.PARSER_OPTIONAL_ELEMENT_ATTRS[name]: if x in _attrs: _attrs.remove(x) if not found: raise FirewallError(errors.PARSE_ERROR, "Unexpected element %s" % name) # raise attributes[0] for x in _attrs: raise FirewallError(errors.PARSE_ERROR, "%s: Unexpected attribute %s" % (name, x)) # PARSER class UnexpectedElementError(Exception): def __init__(self, name): super(UnexpectedElementError, self).__init__() self.name = name def __str__(self): return "Unexpected element '%s'" % (self.name) class MissingAttributeError(Exception): def __init__(self, name, attribute): super(MissingAttributeError, self).__init__() self.name = name self.attribute = attribute def __str__(self): return "Element '%s': missing '%s' attribute" % \ (self.name, self.attribute) class UnexpectedAttributeError(Exception): def __init__(self, name, attribute): super(UnexpectedAttributeError, self).__init__() self.name = name self.attribute = attribute def __str__(self): return "Element '%s': unexpected attribute '%s'" % \ (self.name, self.attribute) class IO_Object_ContentHandler(sax.handler.ContentHandler): def __init__(self, item): self.item = item self._element = "" def startDocument(self): self._element = "" def startElement(self, name, attrs): self._element = "" def endElement(self, name): if name == "short": self.item.short = self._element elif name == "description": self.item.description = self._element def characters(self, content): self._element += content.replace('\n', ' ') class IO_Object_XMLGenerator(saxutils.XMLGenerator): def __init__(self, out): # fix memory leak in saxutils.XMLGenerator.__init__: # out = _gettextwriter(out, encoding) # creates unbound object results in garbage in gc # # saxutils.XMLGenerator.__init__(self, out, "utf-8") # replaced by modified saxutils.XMLGenerator.__init__ code: sax.handler.ContentHandler.__init__(self) self._write = out.write self._flush = out.flush self._ns_contexts = [{}] # contains uri -> prefix dicts self._current_context = self._ns_contexts[-1] self._undeclared_ns_maps = [] self._encoding = "utf-8" self._pending_start_element = False self._short_empty_elements = False def simpleElement(self, name, attrs): """ slightly modified startElement() """ self._write('<' + name) for (name, value) in attrs.items(): self._write(' %s=%s' % (name, saxutils.quoteattr(value))) self._write('/>') def check_port(port): port_range = functions.getPortRange(port) if port_range == -2: raise FirewallError(errors.INVALID_PORT, "port number in '%s' is too big" % port) elif port_range == -1: raise FirewallError(errors.INVALID_PORT, "'%s' is invalid port range" % port) elif port_range is None: raise FirewallError(errors.INVALID_PORT, "port range '%s' is ambiguous" % port) elif len(port_range) == 2 and port_range[0] >= port_range[1]: raise FirewallError(errors.INVALID_PORT, "'%s' is invalid port range" % port) def check_tcpudp(protocol): if protocol not in [ "tcp", "udp", "sctp", "dccp" ]: raise FirewallError(errors.INVALID_PROTOCOL, "'%s' not from {'tcp'|'udp'|'sctp'|'dccp'}" % \ protocol) def check_protocol(protocol): if not functions.checkProtocol(protocol): raise FirewallError(errors.INVALID_PROTOCOL, protocol) def check_address(ipv, addr): if not functions.check_address(ipv, addr): raise FirewallError(errors.INVALID_ADDR, "'%s' is not valid %s address" % (addr, ipv))