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#!/usr/bin/python
############################################################################
# Copyright (C) 2015 Internet Systems Consortium, Inc. ("ISC")
#
# Permission to use, copy, modify, and/or distribute this software 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 ISC DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS. IN NO EVENT SHALL ISC 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.
############################################################################
# kasp2policy.py
# This translates the Keys section of a KASP XML file into a dnssec.policy
# file that can be used by dnssec-keymgr.
############################################################################
from xml.etree import cElementTree as ET
from collections import defaultdict
from isc import dnskey
import ply.yacc as yacc
import ply.lex as lex
import re
############################################################################
# Translate KASP duration values into seconds
############################################################################
class kasptime:
class ktlex:
tokens = ( 'P', 'T', 'Y', 'M', 'D', 'H', 'S', 'NUM' )
t_P = r'(?i)P'
t_T = r'(?i)T'
t_Y = r'(?i)Y'
t_M = r'(?i)M'
t_D = r'(?i)D'
t_H = r'(?i)H'
t_S = r'(?i)S'
def t_NUM(self, t):
r'\d+'
t.value = int(t.value)
return t
def t_error(self, t):
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
def __init__(self):
self.lexer = lex.lex(object=self)
def __init__(self):
self.lexer = self.ktlex()
self.tokens = self.lexer.tokens
self.parser = yacc.yacc(debug=False, write_tables=False, module=self)
def parse(self, text):
self.lexer.lexer.lineno = 0
return self.parser.parse(text)
def p_ktime_4(self, p):
"ktime : P periods T times"
p[0] = p[2] + p[4]
def p_ktime_3(self, p):
"ktime : P T times"
p[0] = p[3]
def p_ktime_2(self, p):
"ktime : P periods"
p[0] = p[2]
def p_periods_1(self, p):
"periods : period"
p[0] = p[1]
def p_periods_2(self, p):
"periods : periods period"
p[0] = p[1] + p[2]
def p_times_1(self, p):
"times : time"
p[0] = p[1]
def p_times_2(self, p):
"times : times time"
p[0] = p[1] + p[2]
def p_period(self, p):
'''period : NUM Y
| NUM M
| NUM D'''
if p[2].lower() == 'y':
p[0] = int(p[1]) * 31536000
elif p[2].lower() == 'm':
p[0] = int(p[1]) * 2592000
elif p[2].lower() == 'd':
p[0] += int(p[1]) * 86400
def p_time(self, p):
'''time : NUM H
| NUM M
| NUM S'''
if p[2].lower() == 'h':
p[0] = int(p[1]) * 3600
elif p[2].lower() == 'm':
p[0] = int(p[1]) * 60
elif p[2].lower() == 's':
p[0] = int(p[1])
def p_error(self, p):
print("Syntax error")
############################################################################
# Load the contents of a KASP XML file as a python dictionary
############################################################################
class kasp():
@staticmethod
def _todict(t):
d = {t.tag: {} if t.attrib else None}
children = list(t)
if children:
dd = defaultdict(list)
for dc in map(kasp._todict, children):
for k, v in dc.iteritems():
dd[k].append(v)
d = {t.tag:
{k:v[0] if len(v) == 1 else v for k, v in dd.iteritems()}}
if t.attrib:
d[t.tag].update(('@' + k, v) for k, v in t.attrib.iteritems())
if t.text:
text = t.text.strip()
if children or t.attrib:
if text:
d[t.tag]['#text'] = text
else:
d[t.tag] = text
return d
def __init__(self, filename):
self._dict = kasp._todict(ET.parse(filename).getroot())
def __getitem__(self, key):
return self._dict[key]
def __len__(self):
return len(self._dict)
def __iter__(self):
return self._dict.__iter__()
def __repr__(self):
return repr(self._dict)
############################################################################
# Load the contents of a KASP XML file as a python dictionary
############################################################################
if __name__ == "__main__":
from pprint import *
import sys
if len(sys.argv) < 2:
print("Usage: kasp2policy <filename>")
exit(1)
try:
kinfo = kasp(sys.argv[1])
except:
print("%s: unable to load KASP file '%s'" % (sys.argv[0], sys.argv[1]))
exit(1)
kt = kasptime()
first = True
for p in kinfo['KASP']['Policy']:
if not p['@name'] or not p['Keys']: continue
if not first:
print("")
first = False
if p['Description']:
d = p['Description'].strip()
print("# %s" % re.sub(r"\n\s*", "\n# ", d))
print("policy %s {" % p['@name'])
ksk = p['Keys']['KSK']
zsk = p['Keys']['ZSK']
kalg = ksk['Algorithm']
zalg = zsk['Algorithm']
algnum = kalg['#text'] or zalg['#text']
if algnum:
print("\talgorithm %s;" % dnskey.algstr(int(algnum)))
if p['Keys']['TTL']:
print("\tkeyttl %d;" % kt.parse(p['Keys']['TTL']))
if kalg['@length']:
print("\tkey-size ksk %d;" % int(kalg['@length']))
if zalg['@length']:
print("\tkey-size zsk %d;" % int(zalg['@length']))
if ksk['Lifetime']:
print("\troll-period ksk %d;" % kt.parse(ksk['Lifetime']))
if zsk['Lifetime']:
print("\troll-period zsk %d;" % kt.parse(zsk['Lifetime']))
if ksk['Standby']:
print("\tstandby ksk %d;" % int(ksk['Standby']))
if zsk['Standby']:
print("\tstandby zsk %d;" % int(zsk['Standby']))
print("};")
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