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# -*- test-case-name: twisted.conch.test.test_openssh_compat -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Factory for reading openssh configuration files: public keys, private keys, and
moduli file.
"""
import os, errno
from twisted.python import log
from twisted.python.util import runAsEffectiveUser
from twisted.conch.ssh import keys, factory, common
from twisted.conch.openssh_compat import primes
class OpenSSHFactory(factory.SSHFactory):
dataRoot = '/usr/local/etc'
# For openbsd which puts moduli in a different directory from keys.
moduliRoot = '/usr/local/etc'
def getPublicKeys(self):
"""
Return the server public keys.
"""
ks = {}
for filename in os.listdir(self.dataRoot):
if filename[:9] == 'ssh_host_' and filename[-8:]=='_key.pub':
try:
k = keys.Key.fromFile(
os.path.join(self.dataRoot, filename))
t = common.getNS(k.blob())[0]
ks[t] = k
except Exception as e:
log.msg('bad public key file %s: %s' % (filename, e))
return ks
def getPrivateKeys(self):
"""
Return the server private keys.
"""
privateKeys = {}
for filename in os.listdir(self.dataRoot):
if filename[:9] == 'ssh_host_' and filename[-4:]=='_key':
fullPath = os.path.join(self.dataRoot, filename)
try:
key = keys.Key.fromFile(fullPath)
except IOError as e:
if e.errno == errno.EACCES:
# Not allowed, let's switch to root
key = runAsEffectiveUser(
0, 0, keys.Key.fromFile, fullPath)
privateKeys[key.sshType()] = key
else:
raise
except Exception as e:
log.msg('bad private key file %s: %s' % (filename, e))
else:
privateKeys[key.sshType()] = key
return privateKeys
def getPrimes(self):
try:
return primes.parseModuliFile(self.moduliRoot+'/moduli')
except IOError:
return None