mirror of
https://github.com/tahoe-lafs/tahoe-lafs.git
synced 2024-12-29 01:08:54 +00:00
90 lines
2.9 KiB
Python
90 lines
2.9 KiB
Python
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import os
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import time
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import foolscap
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from foolscap.eventual import eventually
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from zope.interface import implements
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from twisted.internet import reactor
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from twisted.application import service
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from twisted.python import log
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from pycryptopp.publickey import rsa
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from allmydata.interfaces import RIKeyGenerator
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class KeyGenerator(foolscap.Referenceable):
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implements(RIKeyGenerator)
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DEFAULT_KEY_SIZE = 2048
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pool_size = 16 # no. keys to keep on hand in the pool
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pool_refresh_delay = 6 # no. sec to wait after a fetch before generating new keys
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verbose = False
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def __init__(self):
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self.keypool = []
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self.last_fetch = 0
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eventually(self.maybe_refill_pool)
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def __repr__(self):
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return '<KeyGenerator[%s]>' % (len(self.keypool),)
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def vlog(self, msg):
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if self.verbose:
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log.msg(msg)
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def reset_timer(self):
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self.last_fetch = time.time()
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reactor.callLater(self.pool_refresh_delay, self.maybe_refill_pool)
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def maybe_refill_pool(self):
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now = time.time()
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if self.last_fetch + self.pool_refresh_delay < now:
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self.vlog('%s refilling pool' % (self,))
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while len(self.keypool) < self.pool_size:
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self.keypool.append(self.gen_key(self.DEFAULT_KEY_SIZE))
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else:
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self.vlog('%s not refilling pool' % (self,))
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def gen_key(self, key_size):
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self.vlog('%s generating key size %s' % (self, key_size, ))
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signer = rsa.generate(key_size)
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verifier = signer.get_verifying_key()
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return verifier.serialize(), signer.serialize()
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def remote_get_rsa_key_pair(self, key_size):
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self.vlog('%s remote_get_key' % (self,))
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if key_size != self.DEFAULT_KEY_SIZE or not self.keypool:
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return self.gen_key(key_size)
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else:
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self.reset_timer()
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return self.keypool.pop()
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class KeyGeneratorService(service.MultiService):
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furl_file = 'key_generator.furl'
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def __init__(self):
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service.MultiService.__init__(self)
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self.tub = foolscap.Tub(certFile='key_generator.pem')
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self.tub.setServiceParent(self)
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self.key_generator = KeyGenerator()
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portnum = self.get_portnum()
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self.listener = self.tub.listenOn(portnum or 'tcp:0')
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d = self.tub.setLocationAutomatically()
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if portnum is None:
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d.addCallback(self.save_portnum)
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d.addCallback(self.tub_ready)
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d.addErrback(log.err)
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def get_portnum(self):
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if os.path.exists('portnum'):
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return file('portnum', 'rb').read().strip()
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def save_portnum(self, junk):
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portnum = self.listener.getPortnum()
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file('portnum', 'wb').write('%d\n' % (portnum,))
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def tub_ready(self, junk):
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self.keygen_furl = self.tub.registerReference(self.key_generator, furlFile=self.furl_file)
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print 'key generator at:', self.keygen_furl
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