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# -*- test-case-name: twisted.test.test_strcred -*-
#
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Cred plugin for ssh key login.
"""
from zope.interface import implementer
from twisted import plugin
from twisted.cred.strcred import ICheckerFactory
sshKeyCheckerFactoryHelp = """
This allows SSH public key authentication, based on public keys listed in
authorized_keys and authorized_keys2 files in user .ssh/ directories.
"""
try:
from twisted.conch.checkers import SSHPublicKeyChecker, UNIXAuthorizedKeysFiles
@implementer(ICheckerFactory, plugin.IPlugin)
class SSHKeyCheckerFactory:
"""
Generates checkers that will authenticate a SSH public key
"""
authType = "sshkey"
authHelp = sshKeyCheckerFactoryHelp
argStringFormat = "No argstring required."
credentialInterfaces = SSHPublicKeyChecker.credentialInterfaces
def generateChecker(self, argstring=""):
"""
This checker factory ignores the argument string. Everything
needed to authenticate users is pulled out of the public keys
listed in user .ssh/ directories.
"""
return SSHPublicKeyChecker(UNIXAuthorizedKeysFiles())
theSSHKeyCheckerFactory = SSHKeyCheckerFactory()
except ImportError:
# if checkers can't be imported, then there should be no SSH cred plugin
pass