Current File : //lib/python3/dist-packages/dns/tsigkeyring.py
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
# Copyright (C) 2003-2007, 2009-2011 Nominum, Inc.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose with or without fee is hereby granted,
# provided that the above copyright notice and this permission notice
# appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
"""A place to store TSIG keys."""
import base64
from typing import Any, Dict
import dns.name
import dns.tsig
def from_text(textring: Dict[str, Any]) -> Dict[dns.name.Name, dns.tsig.Key]:
"""Convert a dictionary containing (textual DNS name, base64 secret)
pairs into a binary keyring which has (dns.name.Name, bytes) pairs, or
a dictionary containing (textual DNS name, (algorithm, base64 secret))
pairs into a binary keyring which has (dns.name.Name, dns.tsig.Key) pairs.
@rtype: dict"""
keyring = {}
for name, value in textring.items():
kname = dns.name.from_text(name)
if isinstance(value, str):
keyring[kname] = dns.tsig.Key(kname, value).secret
else:
(algorithm, secret) = value
keyring[kname] = dns.tsig.Key(kname, secret, algorithm)
return keyring
def to_text(keyring: Dict[dns.name.Name, Any]) -> Dict[str, Any]:
"""Convert a dictionary containing (dns.name.Name, dns.tsig.Key) pairs
into a text keyring which has (textual DNS name, (textual algorithm,
base64 secret)) pairs, or a dictionary containing (dns.name.Name, bytes)
pairs into a text keyring which has (textual DNS name, base64 secret) pairs.
@rtype: dict"""
textring = {}
def b64encode(secret):
return base64.encodebytes(secret).decode().rstrip()
for name, key in keyring.items():
tname = name.to_text()
if isinstance(key, bytes):
textring[tname] = b64encode(key)
else:
if isinstance(key.secret, bytes):
text_secret = b64encode(key.secret)
else:
text_secret = str(key.secret)
textring[tname] = (key.algorithm.to_text(), text_secret)
return textring
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