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Merge djmitche/build-fwunit:issue20 (PR #20)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| # This Source Code Form is subject to the terms of the Mozilla Public | ||
| # License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| # file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
|
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| import os | ||
| import yaml | ||
|
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| _loaded_config = None | ||
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| def load_config(filename="fwunit.yaml"): | ||
| global _loaded_config | ||
| if _loaded_config: | ||
| if _loaded_config[0] != filename: | ||
| raise RuntimeError("load_config already called with %r" % (_loaded_config[0],)) | ||
| return | ||
|
|
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| # chdir to cfg file so rel paths work | ||
| config_dir = os.path.dirname(os.path.abspath(filename)) | ||
| os.chdir(config_dir) | ||
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| _loaded_config = (filename, yaml.load(open(filename))) | ||
| return _loaded_config[1] | ||
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| def _clear(): | ||
| # for tests only | ||
| global _loaded_config | ||
| _loaded_config = None |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| # This Source Code Form is subject to the terms of the Mozilla Public | ||
| # License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| # file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
|
|
||
| import itertools | ||
| import json | ||
| import logging | ||
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| from blessings import Terminal | ||
| from fwunit import types | ||
| from fwunit.ip import IP, IPSet, IPPairs | ||
|
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| log = logging.getLogger(__name__) | ||
| terminal = Terminal() | ||
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| def _ipset(ip): | ||
| if isinstance(ip, basestring): | ||
| ip = IP(ip) | ||
| if isinstance(ip, IP): | ||
| ip = IPSet([ip]) | ||
| return ip | ||
|
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| class Source(object): | ||
| def __init__(self, filename): | ||
| self.rules = types.from_jsonable(json.load(open(filename))['rules']) | ||
|
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| def _rules_for_app(self, app): | ||
| # get the rules for the given app, or if no such app is known, for @@other | ||
| try: | ||
| return self.rules[app] | ||
| except KeyError: | ||
| return self.rules.get('@@other', []) | ||
|
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| def rulesDeny(self, src, dst, apps): | ||
| src = _ipset(src) | ||
| dst = _ipset(dst) | ||
| log.info("rulesDeny(%r, %r, %r)" % (src, dst, apps)) | ||
| failures = 0 | ||
| apps = apps if not isinstance(apps, basestring) else [apps] | ||
| for app in apps: | ||
| log.info("checking application %r" % app) | ||
| for rule in self._rules_for_app(app): | ||
| src_matches = (rule.src & src) | ||
| if not src_matches: | ||
| continue | ||
| dst_matches = (rule.dst & dst) | ||
| if not dst_matches: | ||
| continue | ||
| log.error("policy {t.cyan}{name}{t.normal} permits {t.bold_cyan}{app}{t.normal} " | ||
| "traffic\n{t.yellow}{src}{t.normal} -> {t.magenta}{dst}{t.normal}".format( | ||
| t=terminal, | ||
| name=rule.name, | ||
| app=app, | ||
| src=src_matches, | ||
| dst=dst_matches) | ||
| ) | ||
| failures += 1 | ||
| return failures == 0 | ||
|
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| def rulesPermit(self, src, dst, apps): | ||
| src = _ipset(src) | ||
| dst = _ipset(dst) | ||
| log.info("rulesPermit(%r, %r, %r)" % (src, dst, apps)) | ||
| remaining = IPPairs((src, dst)) | ||
| apps = apps if not isinstance(apps, basestring) else [apps] | ||
| for app in apps: | ||
| log.info("checking application %r" % app) | ||
| for rule in self._rules_for_app(app): | ||
| if (rule.src & src) and (rule.dst & dst): | ||
| log.info("matched policy {t.cyan}{name}{t.normal}\n{t.yellow}{src}{t.normal} " | ||
| "-> {t.magenta}{dst}{t.normal}".format( | ||
| t=terminal, name=rule.name, src=rule.src, dst=rule.dst)) | ||
| remaining = remaining - IPPairs((rule.src, rule.dst)) | ||
| if remaining: | ||
| flows = ",\n".join("{t.yellow}{src}{t.normal} -> {t.magenta}{dst}{t.normal}".format( | ||
| t=terminal, src=p[0], dst=p[1]) for p in remaining) | ||
| log.error("No rule found for flows, app {t.bold_cyan}{app}{t.normal}\n{flows}" | ||
| .format(t=terminal, app=app, flows=flows)) | ||
| return False | ||
| return True | ||
|
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| def allApps(self, src, dst, debug=False): | ||
| src = _ipset(src) | ||
| dst = _ipset(dst) | ||
| log.info("allApps(%r, %r)" % (src, dst)) | ||
| rv = set() | ||
| for rule in itertools.chain(*self.rules.itervalues()): | ||
| if not debug and rule.app in rv: | ||
| continue | ||
| src_matches = (rule.src & src) | ||
| if not src_matches: | ||
| continue | ||
| dst_matches = (rule.dst & dst) | ||
| if not dst_matches: | ||
| continue | ||
| log.info("matched policy {t.cyan}{name}{t.normal} app {t.bold_cyan}{app}{t.normal}\n" | ||
| "{t.yellow}{src}{t.normal} -> {t.magenta}{dst}{t.normal}".format( | ||
| t=terminal, name=rule.name, src=src_matches, dst=dst_matches, app=rule.app)) | ||
| rv.add(rule.app) | ||
| if '@@other' in rv: | ||
| rv = set(['any']) | ||
| return rv | ||
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| def sourcesFor(self, dst, app, ignore_sources=None): | ||
| dst = _ipset(dst) | ||
| log.info("sourcesFor(%r, %r, ignore_sources=%r)" % (dst, app, ignore_sources)) | ||
| rv = IPSet() | ||
| for rule in self._rules_for_app(app): | ||
| if rule.dst & dst: | ||
| src = rule.src | ||
| if ignore_sources: | ||
| src = src - ignore_sources | ||
| if src: | ||
| log.info("matched policy {t.cyan}{name}{t.normal}\n{t.yellow}{src}{t.normal} " | ||
| "-> {t.magenta}{dst}{t.normal}".format( | ||
| t=terminal, name=rule.name, src=src, dst=rule.dst & dst)) | ||
| rv = rv + src | ||
| return rv | ||
|
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| _cache = {} | ||
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| def load_source(cfg, source): | ||
| """Load the named source. Sources are cached, so multiple calls with the same name | ||
| will not repeatedly re-load the data from disk.""" | ||
| if source not in _cache: | ||
| _cache[source] = Source(cfg[source]['output']) | ||
| return _cache[source] | ||
|
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| def _clear(): | ||
| # for tests only | ||
| global _cache | ||
| _cache = {} |
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