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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
An error to represent bad things happening in Conch.
Maintainer: Paul Swartz
"""
from __future__ import absolute_import, division
from twisted.cred.error import UnauthorizedLogin
class ConchError(Exception):
def __init__(self, value, data = None):
Exception.__init__(self, value, data)
self.value = value
self.data = data
class NotEnoughAuthentication(Exception):
"""
This is thrown if the authentication is valid, but is not enough to
successfully verify the user. i.e. don't retry this type of
authentication, try another one.
"""
class ValidPublicKey(UnauthorizedLogin):
"""
Raised by public key checkers when they receive public key credentials
that don't contain a signature at all, but are valid in every other way.
(e.g. the public key matches one in the user's authorized_keys file).
Protocol code (eg
L{SSHUserAuthServer<twisted.conch.ssh.userauth.SSHUserAuthServer>}) which
attempts to log in using
L{ISSHPrivateKey<twisted.cred.credentials.ISSHPrivateKey>} credentials
should be prepared to handle a failure of this type by telling the user to
re-authenticate using the same key and to include a signature with the new
attempt.
See U{http://www.ietf.org/rfc/rfc4252.txt} section 7 for more details.
"""
class IgnoreAuthentication(Exception):
"""
This is thrown to let the UserAuthServer know it doesn't need to handle the
authentication anymore.
"""
class MissingKeyStoreError(Exception):
"""
Raised if an SSHAgentServer starts receiving data without its factory
providing a keys dict on which to read/write key data.
"""
class UserRejectedKey(Exception):
"""
The user interactively rejected a key.
"""
class InvalidEntry(Exception):
"""
An entry in a known_hosts file could not be interpreted as a valid entry.
"""
class HostKeyChanged(Exception):
"""
The host key of a remote host has changed.
@ivar offendingEntry: The entry which contains the persistent host key that
disagrees with the given host key.
@type offendingEntry: L{twisted.conch.interfaces.IKnownHostEntry}
@ivar path: a reference to the known_hosts file that the offending entry
was loaded from
@type path: L{twisted.python.filepath.FilePath}
@ivar lineno: The line number of the offending entry in the given path.
@type lineno: L{int}
"""
def __init__(self, offendingEntry, path, lineno):
Exception.__init__(self)
self.offendingEntry = offendingEntry
self.path = path
self.lineno = lineno
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