-# TODO See if it's better (more secure) to execute commands via python instead
-# of using script templates.
-
-from mako.template import Template
-from mako.runtime import Context
-from os import path
-try:
- import cPickle as pickle
-except ImportError:
- import pickle
-
-try:
- from seqtools import Sequence
-except ImportError:
- # NOP for testing
- class Sequence: pass
-try:
- from dispatcher import Handler, handler, HandlerError
-except ImportError:
- # NOP for testing
- class HandlerError(RuntimeError): pass
- class Handler: pass
- def handler(help):
- def wrapper(f):
- return f
- return wrapper
-
-__ALL__ = ('FirewallHandler', 'Error', 'RuleError', 'RuleAlreadyExistsError',
- 'RuleNotFoundError')
-
-pickle_ext = '.pkl'
-pickle_rules = 'rules'
-
-config_filename = 'iptables.sh'
-
-template_dir = path.join(path.dirname(__file__), 'templates')
-
-class Error(HandlerError):
- r"""
- Error(command) -> Error instance :: Base FirewallHandler exception class.
-
- All exceptions raised by the FirewallHandler inherits from this one, so you can
- easily catch any FirewallHandler exception.
-
- message - A descriptive error message.
- """
-
- def __init__(self, message):
- r"Initialize the Error object. See class documentation for more info."
- self.message = message
-
- def __str__(self):
- return self.message
-
-class RuleError(Error, KeyError):
- r"""
- RuleError(rule) -> RuleError instance.
-
- This is the base exception for all rule related errors.
- """
-
- def __init__(self, rule):
- r"Initialize the object. See class documentation for more info."
- self.message = 'Rule error: "%s"' % rule
-
-class RuleAlreadyExistsError(RuleError):
- r"""
- RuleAlreadyExistsError(rule) -> RuleAlreadyExistsError instance.
-
- This exception is raised when trying to add a rule that already exists.
- """
-
- def __init__(self, rule):
- r"Initialize the object. See class documentation for more info."
- self.message = 'Rule already exists: "%s"' % rule
-
-class RuleNotFoundError(RuleError):
- r"""
- RuleNotFoundError(rule) -> RuleNotFoundError instance.
-
- This exception is raised when trying to operate on a rule that doesn't
- exists.
- """
-
- def __init__(self, rule):
- r"Initialize the object. See class documentation for more info."
- self.message = 'Rule not found: "%s"' % rule
-
-class Rule(Sequence):
- r"""Rule(chain, target[, src[, dst[, ...]]]) -> Rule instance.
-
- chain - INPUT, OUTPUT or FORWARD.
- target - ACCEPT, REJECT or DROP.
- src - Source subnet as IP/mask.
- dst - Destination subnet as IP/mask.
- protocol - ICMP, UDP, TCP or ALL.
- src_port - Source port (only for UDP or TCP protocols).
- dst_port - Destination port (only for UDP or TCP protocols).
- """
-
- def __init__(self, chain, target, src=None, dst=None, protocol=None,
- src_port=None, dst_port=None):
- r"Initialize object, see class documentation for details."
- self.chain = chain
- self.target = target
- self.src = src
- self.dst = dst
- self.protocol = protocol
- # TODO Validate that src_port and dst_port could be not None only
- # if the protocol is UDP or TCP
- self.src_port = src_port
- self.dst_port = dst_port
-
- def update(self, chain=None, target=None, src=None, dst=None, protocol=None,
- src_port=None, dst_port=None):
- r"update([chain[, ...]]) -> Update the values of a rule (see Rule doc)."
- if chain is not None: self.chain = chain
- if target is not None: self.target = target
- if src is not None: self.src = src
- if dst is not None: self.dst = dst
- if protocol is not None: self.protocol = protocol
- # TODO Validate that src_port and dst_port could be not None only
- # if the protocol is UDP or TCP
- if src_port is not None: self.src_port = src_port
- if dst_port is not None: self.dst_port = dst_port
-
- def __cmp__(self, other):
- r"Compares two Rule objects."
- if self.chain == other.chain \
- and self.target == other.target \
- and self.src == other.src \
- and self.dst == other.dst \
- and self.protocol == other.protocol \
- and self.src_port == other.src_port \
- and self.dst_port == other.dst_port:
- return 0
- return cmp(id(self), id(other))
-
- def as_tuple(self):
- r"Return a tuple representing the rule."
- return (self.chain, self.target, self.src, self.dst, self.protocol,
- self.src_port)
-
-class RuleHandler(Handler):
- r"""RuleHandler(rules) -> RuleHandler instance :: Handle a list of rules.
-
- This class is a helper for FirewallHandler to do all the work related to rules
- administration.
-
- rules - A list of Rule objects.
- """
-
- def __init__(self, rules):
- r"Initialize the object, see class documentation for details."
- self.rules = rules
-
- @handler(u'Add a new rule.')
- def add(self, *args, **kwargs):
- r"add(rule) -> None :: Add a rule to the rules list (see Rule doc)."
- rule = Rule(*args, **kwargs)
- if rule in self.rules:
- raise RuleAlreadyExistsError(rule)
- self.rules.append(rule)
-
- @handler(u'Update a rule.')
- def update(self, index, *args, **kwargs):
- r"update(index, rule) -> None :: Update a rule (see Rule doc)."
- # TODO check if the modified rule is the same of an existing one
- index = int(index) # TODO validation
- try:
- self.rules[index].update(*args, **kwargs)
- except IndexError:
- raise RuleNotFoundError(index)
-
- @handler(u'Delete a rule.')
- def delete(self, index):
- r"delete(index) -> Rule :: Delete a rule from the list returning it."
- index = int(index) # TODO validation
- try:
- return self.rules.pop(index)
- except IndexError:
- raise RuleNotFoundError(index)
-
- @handler(u'Get information about a rule.')
- def get(self, index):
- r"get(rule) -> Rule :: Get all the information about a rule."
- index = int(index) # TODO validation
- try:
- return self.rules[index]
- except IndexError:
- raise RuleNotFoundError(index)
-
- @handler(u'Get information about all rules.')
- def show(self):
- r"show() -> list of Rules :: List all the complete rules information."
- return self.rules
-
-class FirewallHandler(Handler):
- r"""FirewallHandler([pickle_dir[, config_dir]]) -> FirewallHandler instance.
-
- Handles firewall commands using iptables.
-
- pickle_dir - Directory where to write the persistent configuration data.
-
- config_dir - Directory where to store de generated configuration files.
-
- Both defaults to the current working directory.
- """
-
- def __init__(self, pickle_dir='.', config_dir='.'):
- r"Initialize FirewallHandler object, see class documentation for details."
- self.pickle_dir = pickle_dir
- self.config_dir = config_dir
- filename = path.join(template_dir, config_filename)
- self.template = Template(filename=filename)
- try:
- self._load()
- except IOError:
- # This is the first time the handler is used, create a basic
- # setup using some nice defaults
- self.rules = list() # TODO defaults?
- self._dump()
- self._write_config()
- self.rule = RuleHandler(self.rules)
-
- # Does this (start, stop, restart, reload) makes sense???
- # Implement a "try" command that apply the changes for some time and
- # then goes back to the previous configuration if the changes are not
- # commited. TODO
- @handler(u'Start the service.')
- def start(self):
- r"start() -> None :: Start the firewall."
- #esto seria para poner en una interfaz
- #y seria el hook para arrancar el servicio
- pass
-
- @handler(u'Stop the service.')
- def stop(self):
- r"stop() -> None :: Stop the firewall."
- #esto seria para poner en una interfaz
- #y seria el hook para arrancar el servicio
- pass
-
- @handler(u'Restart the service.')
- def restart(self):
- r"restart() -> None :: Restart the firewall."
- #esto seria para poner en una interfaz
- #y seria el hook para arrancar el servicio
- pass
-
- @handler(u'Reload the service config (without restarting, if possible).')
- def reload(self):
- r"reload() -> None :: Reload the configuration of the firewall."
- #esto seria para poner en una interfaz
- #y seria el hook para arrancar el servicio
- pass
-
- @handler(u'Commit the changes (reloading the service, if necessary).')
- def commit(self):
- r"commit() -> None :: Commit the changes and reload the firewall."
- #esto seria para poner en una interfaz
- #y seria que hace el pickle deberia llamarse
- #al hacerse un commit
- self._dump()
- self._write_config()
- self.reload() # TODO exec the script
-
- @handler(u'Discard all the uncommited changes.')
- def rollback(self):
- r"rollback() -> None :: Discard the changes not yet commited."
- self._load()
-
- def _dump(self):
- r"_dump() -> None :: Dump all persistent data to pickle files."
- # XXX podría ir en una clase base
- self._dump_var(self.rules, pickle_rules)
-
- def _load(self):
- r"_load() -> None :: Load all persistent data from pickle files."
- # XXX podría ir en una clase base
- self.rules = self._load_var(pickle_rules)
-
- def _pickle_filename(self, name):
- r"_pickle_filename() -> string :: Construct a pickle filename."
- # XXX podría ir en una clase base
- return path.join(self.pickle_dir, name) + pickle_ext
-
- def _dump_var(self, var, name):
- r"_dump_var() -> None :: Dump a especific variable to a pickle file."
- # XXX podría ir en una clase base
- pkl_file = file(self._pickle_filename(name), 'wb')
- pickle.dump(var, pkl_file, 2)
- pkl_file.close()
-
- def _load_var(self, name):
- r"_load_var() -> object :: Load a especific pickle file."
- # XXX podría ir en una clase base
- return pickle.load(file(self._pickle_filename(name)))
-
- def _write_config(self):
- r"_write_config() -> None :: Generate all the configuration files."
- # XXX podría ir en una clase base, ver como generalizar variables a
- # reemplazar en la template
- out_file = file(path.join(self.config_dir, config_filename), 'w')
- ctx = Context(out_file, rules=self.rules)
- self.template.render_context(ctx)
- out_file.close()
-
-if __name__ == '__main__':
-
- import os
-
- fw_handler = FirewallHandler()
-
- def dump():
- print '-' * 80
- print 'Rules:'
- print fw_handler.rule.show()
- print '-' * 80
-
- dump()
-
- fw_handler.rule.add('input','drop','icmp')
-
- fw_handler.rule.update(0, dst='192.168.0.188/32')
-
- fw_handler.rule.add('output','accept', '192.168.1.0/24')
-
- fw_handler.commit()
-
- dump()
-
- for f in (pickle_rules + pickle_ext, config_filename):
- os.unlink(f)
projects / software / pymin.git / blobdiff