晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/share/crypto-policies/python/policygenerators/krb5.py
# SPDX-License-Identifier: LGPL-2.1-or-later

# Copyright (c) 2019 Red Hat, Inc.
# Copyright (c) 2019 Tomáš Mráz <tmraz@fedoraproject.org>

from .configgenerator import ConfigGenerator


class KRB5Generator(ConfigGenerator):
	CONFIG_NAME = 'krb5'
	SCOPES = {'kerberos', 'krb5'}

	cipher_map = {
		'CAMELLIA-256-CBC':'camellia256-cts-cmac',
		'CAMELLIA-128-CBC':'camellia128-cts-cmac',
		'CAMELLIA-128-CTS':'camellia128-cts-cmac'
	}

	cipher_mac_map = {
		'AES-256-CBC-HMAC-SHA1':'aes256-cts-hmac-sha1-96',
		'AES-256-CBC-HMAC-SHA2-384':'aes256-cts-hmac-sha384-192',
		'AES-128-CBC-HMAC-SHA1':'aes128-cts-hmac-sha1-96',
		'AES-128-CBC-HMAC-SHA2-256':'aes128-cts-hmac-sha256-128',
		# 'RC4-128-HMAC-MD5':'arcfour-hmac-md5'  # forced last, see below
	}

	@classmethod
	def generate_config(cls, policy):
		p = policy.enabled
		sep = ' '

		cfg = '[libdefaults]\n'
		cfg += 'permitted_enctypes = '
		s = ''
		for j in p['mac']:
			for i in p['cipher']:
				try:
					s = cls.append(s, cls.cipher_mac_map[i + '-' + j], sep)
				except KeyError:
					pass
		for i in p['cipher']:
			try:
				s = cls.append(s, cls.cipher_map[i], sep)
			except KeyError:
				pass
		if 'RC4-128' in p['cipher'] and 'HMAC-MD5' in p['mac']:
			s = cls.append(s, 'arcfour-hmac-md5', sep)

		cfg += s + '\n'

		# By default libkrb5 sets the min_bits to 2048, don't
		# go lower than that.
		if policy.integers['min_dh_size'] > 2048:
			# $string .= "pkinit_dh_min_bits=$min_dh_size\n";
			# krb5.conf only accepts 2048 or 4096
			cfg += 'pkinit_dh_min_bits=4096\n'

		return cfg

	@classmethod
	def test_config(cls, config):  # pylint: disable=unused-argument
		return True

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