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✏️ Editing: cred_sshkeys.py

# -*- 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

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