110 lines
3.3 KiB
Python
110 lines
3.3 KiB
Python
from typing import List as _List
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from os.path import join as _join, isdir as _isdir, abspath as _abspath
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from datetime import datetime as _datetime
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from ipaddress import ip_network, ip_address
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from subprocess import run as _run
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from os import makedirs as _makedirs, unlink as _unlink
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from shutil import rmtree as _rmtree
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from glob import glob as _glob
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_PKI_DIR = _abspath('pki/dnssec')
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_ALGO = 'ECDSAP256SHA256'
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_ZSK_LEN = 512
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_KSK_LEN = _ZSK_LEN
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def nsd_serial() -> str:
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return _datetime.now().strftime('%m%d%H%M%S')
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def value_in(value: str,
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values: _List[str],
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) -> bool:
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for val in values:
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if value == val:
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return True
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return False
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def nsd_concat_lists(list1: _List[str],
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list2: _List[str],
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str1: str=None,
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) -> _List[str]:
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ret = list1 + list2
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if str1:
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ret.append(str1)
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return ret
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def get_reverse_name(network: str) -> str:
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if not network:
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return
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network_obj = ip_network(network)
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if network_obj.prefixlen != 24:
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raise ValueError('only netmask "255.255.255.0" is supported for DNS reverse name')
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o1, o2, o3, o4 = network.split('.')
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return f'{o3}.{o2}.{o1}.in-addr.arpa.'
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def _gen_key(cn:str,
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authority_cn: str,
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type: str,
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) -> str:
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dir_name = _join(_PKI_DIR, cn, authority_cn, type)
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filename = None
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if _isdir(dir_name):
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filenames = _glob(_join(dir_name, f'K{authority_cn}.+*.key'))
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if filenames:
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filename = filenames[0].rsplit('.', 1)[0]
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if filename is None:
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if _isdir(dir_name):
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_rmtree(dir_name)
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_makedirs(dir_name)
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if type == 'zsk':
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cmd = ['ldns-keygen', '-a', _ALGO, '-b', str(_ZSK_LEN), authority_cn]
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else:
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cmd = ['ldns-keygen', '-a', _ALGO, '-b', str(_KSK_LEN), '-k', authority_cn]
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proc = _run(cmd,
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cwd=dir_name,
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capture_output=True,
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)
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if proc.returncode != 0:
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raise Exception(f'cannot generate {type}: {proc.stdout.decode()}, {proc.stderr.decode()}')
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filename = _join(dir_name, proc.stdout.decode().strip())
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return filename
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def _gen_keys(cn,
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authority_cn,
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) -> str:
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zsk = _gen_key(cn, authority_cn, 'zsk')
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ksk = _gen_key(cn, authority_cn, 'ksk')
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return zsk, ksk
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def gen_cert(cn: str,
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authority_cn: str,
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) -> str:
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zsk, ksk = _gen_keys(cn, authority_cn)
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with open(f'{ksk}.key') as fh:
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content = fh.read().strip()
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scontent = content.split()
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infos = ' '.join(scontent[3:6])
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return f'"{authority_cn}." {infos} "{scontent[6]}";'
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def sign(zone_filename: str,
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cn: str,
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) -> str:
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authority_cn = zone_filename.rsplit('/', 1)[-1].rsplit('.', 1)[0]
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zsk, ksk = _gen_keys(cn, authority_cn)
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cmd = ['ldns-signzone', '-n', zone_filename, zsk, ksk]
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proc = _run(cmd, capture_output=True)
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if proc.returncode != 0:
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raise Exception(f'cannot sign {zone_filename}: {proc.stdout.decode()}, {proc.stderr.decode()}')
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signed_filename = f'{zone_filename}.signed'
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with open(signed_filename) as fh:
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content = fh.read().strip()
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_unlink(signed_filename)
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return content
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