keyseries.py
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############################################################################ # Copyright (C) Internet Systems Consortium, Inc. ("ISC") # # 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 https://mozilla.org/MPL/2.0/. # # See the COPYRIGHT file distributed with this work for additional # information regarding copyright ownership. ############################################################################ from collections import defaultdict from .dnskey import * from .keydict import * from .keyevent import * from .policy import * import time class keyseries: _K = defaultdict(lambda: defaultdict(list)) _Z = defaultdict(lambda: defaultdict(list)) _zones = set() _kdict = None _context = None def __init__(self, kdict, now=time.time(), context=None): self._kdict = kdict self._context = context self._zones = set(kdict.missing()) for zone in kdict.zones(): self._zones.add(zone) for alg, keys in kdict[zone].items(): for k in keys.values(): if k.sep: if not (k.delete() and k.delete() < now): self._K[zone][alg].append(k) else: if not (k.delete() and k.delete() < now): self._Z[zone][alg].append(k) self._K[zone][alg].sort() self._Z[zone][alg].sort() def __iter__(self): for zone in self._zones: for collection in [self._K, self._Z]: if zone not in collection: continue for alg, keys in collection[zone].items(): for key in keys: yield key def dump(self): for k in self: print("%s" % repr(k)) def fixseries(self, keys, policy, now, **kwargs): force = kwargs.get('force', False) if not keys: return # handle the first key key = keys[0] if key.sep: rp = policy.ksk_rollperiod prepub = policy.ksk_prepublish or (30 * 86400) postpub = policy.ksk_postpublish or (30 * 86400) else: rp = policy.zsk_rollperiod prepub = policy.zsk_prepublish or (30 * 86400) postpub = policy.zsk_postpublish or (30 * 86400) # the first key should be published and active p = key.publish() a = key.activate() if not p or p > now: key.setpublish(now) p = now if not a or a > now: key.setactivate(now) a = now i = key.inactive() fudge = 300 if not rp: key.setinactive(None, **kwargs) key.setdelete(None, **kwargs) elif not i or a + rp != i: if not i and a + rp > now + prepub + fudge: key.setinactive(a + rp, **kwargs) key.setdelete(a + rp + postpub, **kwargs) elif not i: key.setinactive(now + prepub + fudge, **kwargs) key.setdelete(now + prepub + postpub + fudge, **kwargs) elif i < now: pass elif a + rp > i: key.setinactive(a + rp, **kwargs) key.setdelete(a + rp + postpub, **kwargs) elif a + rp > now + prepub + fudge: key.setinactive(a + rp, **kwargs) key.setdelete(a + rp + postpub, **kwargs) else: key.setinactive(now + prepub + fudge, **kwargs) key.setdelete(now + prepub + postpub + fudge, **kwargs) else: d = key.delete() if not d or i + postpub > now + fudge: key.setdelete(i + postpub, **kwargs) elif not d: key.setdelete(now + postpub + fudge, **kwargs) elif d < now + fudge: pass elif d < i + postpub: key.setdelete(i + postpub, **kwargs) if policy.keyttl != key.ttl: key.setttl(policy.keyttl) # handle all the subsequent keys prev = key for key in keys[1:]: # if no rollperiod, then all keys after the first in # the series kept inactive. # (XXX: we need to change this to allow standby keys) if not rp: key.setpublish(None, **kwargs) key.setactivate(None, **kwargs) key.setinactive(None, **kwargs) key.setdelete(None, **kwargs) if policy.keyttl != key.ttl: key.setttl(policy.keyttl) continue # otherwise, ensure all dates are set correctly based on # the initial key a = prev.inactive() p = a - prepub key.setactivate(a, **kwargs) key.setpublish(p, **kwargs) key.setinactive(a + rp, **kwargs) key.setdelete(a + rp + postpub, **kwargs) prev.setdelete(a + postpub, **kwargs) if policy.keyttl != key.ttl: key.setttl(policy.keyttl) prev = key # if we haven't got sufficient coverage, create successor key(s) while rp and prev.inactive() and \ prev.inactive() < now + policy.coverage: # commit changes to predecessor: a successor can only be # generated if Inactive has been set in the predecessor key prev.commit(self._context['settime_path'], **kwargs) key = prev.generate_successor(self._context['keygen_path'], self._context['randomdev'], prepub, **kwargs) key.setinactive(key.activate() + rp, **kwargs) key.setdelete(key.inactive() + postpub, **kwargs) keys.append(key) prev = key # last key? we already know we have sufficient coverage now, so # disable the inactivation of the final key (if it was set), # ensuring that if dnssec-keymgr isn't run again, the last key # in the series will at least remain usable. prev.setinactive(None, **kwargs) prev.setdelete(None, **kwargs) # commit changes for key in keys: key.commit(self._context['settime_path'], **kwargs) def enforce_policy(self, policies, now=time.time(), **kwargs): # If zones is provided as a parameter, use that list. # If not, use what we have in this object zones = kwargs.get('zones', self._zones) keys_dir = kwargs.get('dir', self._context.get('keys_path', None)) force = kwargs.get('force', False) for zone in zones: collections = [] policy = policies.policy(zone) keys_dir = keys_dir or policy.directory or '.' alg = policy.algorithm algnum = dnskey.algnum(alg) if 'ksk' not in kwargs or not kwargs['ksk']: if len(self._Z[zone][algnum]) == 0: k = dnskey.generate(self._context['keygen_path'], self._context['randomdev'], keys_dir, zone, alg, policy.zsk_keysize, False, policy.keyttl or 3600, **kwargs) self._Z[zone][algnum].append(k) collections.append(self._Z[zone]) if 'zsk' not in kwargs or not kwargs['zsk']: if len(self._K[zone][algnum]) == 0: k = dnskey.generate(self._context['keygen_path'], self._context['randomdev'], keys_dir, zone, alg, policy.ksk_keysize, True, policy.keyttl or 3600, **kwargs) self._K[zone][algnum].append(k) collections.append(self._K[zone]) for collection in collections: for algorithm, keys in collection.items(): if algorithm != algnum: continue try: self.fixseries(keys, policy, now, **kwargs) except Exception as e: raise Exception('%s/%s: %s' % (zone, dnskey.algstr(algnum), str(e)))
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