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# Copyright (c) 2001-2008 Twisted Matrix Laboratories.
# See LICENSE for details.

"""
A Factory for SSH servers, along with an OpenSSHFactory to use the same
data sources as OpenSSH.

Maintainer: Paul Swartz
"""

try:
    import resource
except ImportError:
    resource = None

from twisted.internet import protocol
from twisted.python import log
from twisted.python.reflect import qual

from twisted.conch import error
from twisted.conch.ssh import keys
import transport, userauth, connection

import random
import warnings

class SSHFactory(protocol.Factory):

    protocol = transport.SSHServerTransport

    services = {
        'ssh-userauth':userauth.SSHUserAuthServer,
        'ssh-connection':connection.SSHConnection
    }
    def startFactory(self):
        # disable coredumps
        if resource:
            resource.setrlimit(resource.RLIMIT_CORE, (0,0))
        else:
            log.msg('INSECURE: unable to disable core dumps.')
        if not hasattr(self,'publicKeys'):
            self.publicKeys = self.getPublicKeys()
        for keyType, value in self.publicKeys.items():
            if isinstance(value, str):
                warnings.warn("Returning a mapping from strings to "
                        "strings from getPublicKeys()/publicKeys (in %s) "
                        "is deprecated.  Return a mapping from "
                        "strings to Key objects instead." %
                        (qual(self.__class__)),
                        DeprecationWarning, stacklevel=1)
                self.publicKeys[keyType] = keys.Key.fromString(value)
        if not hasattr(self,'privateKeys'):
            self.privateKeys = self.getPrivateKeys()
        for keyType, value in self.privateKeys.items():
            if not isinstance(value, keys.Key):
                warnings.warn("Returning a mapping from strings to "
                        "PyCrypto key objects from "
                        "getPrivateKeys()/privateKeys (in %s) "
                        "is deprecated.  Return a mapping from "
                        "strings to Key objects instead." %
                        (qual(self.__class__),),
                        DeprecationWarning, stacklevel=1)
                self.privateKeys[keyType] = keys.Key(value)
        if not self.publicKeys or not self.privateKeys:
            raise error.ConchError('no host keys, failing')
        if not hasattr(self,'primes'):
            self.primes = self.getPrimes()

    def buildProtocol(self, addr):
        t = protocol.Factory.buildProtocol(self, addr)
        t.supportedPublicKeys = self.privateKeys.keys()
        if not self.primes:
            log.msg('disabling diffie-hellman-group-exchange because we '
                    'cannot find moduli file')
            ske = t.supportedKeyExchanges[:]
            ske.remove('diffie-hellman-group-exchange-sha1')
            t.supportedKeyExchanges = ske
        return t

    def getPublicKeys(self):
        """
        Called when the factory is started to get the public portions of the
        servers host keys.  Returns a dictionary mapping SSH key types to
        public key strings.

        @rtype: C{dict}
        """
        raise NotImplementedError('getPublicKeys unimplemented')

    def getPrivateKeys(self):
        """
        Called when the factory is started to get the  private portions of the
        servers host keys.  Returns a dictionary mapping SSH key types to
        C{Crypto.PublicKey.pubkey.pubkey} objects.

        @rtype: C{dict}
        """
        raise NotImplementedError('getPrivateKeys unimplemented')

    def getPrimes(self):
        """
        Called when the factory is started to get Diffie-Hellman generators and
        primes to use.  Returns a dictionary mapping number of bits to lists
        of tuple of (generator, prime).

        @rtype: C{dict}
        """

    def getDHPrime(self, bits):
        """
        Return a tuple of (g, p) for a Diffe-Hellman process, with p being as
        close to bits bits as possible.

        @type bits: C{int}
        @rtype:     C{tuple}
        """
        primesKeys = self.primes.keys()
        primesKeys.sort(lambda x, y: cmp(abs(x - bits), abs(y - bits)))
        realBits = primesKeys[0]
        return random.choice(self.primes[realBits])

    def getService(self, transport, service):
        """
        Return a class to use as a service for the given transport.

        @type transport:    L{transport.SSHServerTransport}
        @type service:      C{str}
        @rtype:             subclass of L{service.SSHService}
        """
        if service == 'ssh-userauth' or hasattr(transport, 'avatar'):
            return self.services[service]

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