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dns.nsupdate: add additional validation for nameserver ip lookup

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This commit is contained in:
Kishi85 2019-03-11 19:42:41 +01:00
parent 3f59bb4061
commit 53fcc0b2a6
1 changed files with 20 additions and 6 deletions
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26
acertmgr/modes/dns/nsupdate.py
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@ -19,6 +19,16 @@ import dns.update
from acertmgr.modes.dns.abstract import DNSChallengeHandler
REGEX_IP4 = r'^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$'
REGEX_IP6 = r'^(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}' \
r':|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}' \
r'(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}' \
r'|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}' \
r'(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})' \
r'|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}' \
r'|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}' \
r'(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}' \
r':((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$'
DEFAULT_KEY_ALGORITHM = "HMAC-MD5.SIG-ALG.REG.INT"
@ -65,13 +75,17 @@ class ChallengeHandler(DNSChallengeHandler):
@staticmethod
def _lookup_dns_server(domain_or_ip):
try:
return str(ipaddress.ip_address(domain_or_ip))
if re.search(REGEX_IP4, domain_or_ip.strip()) or re.search(REGEX_IP6, domain_or_ip.strip()):
return str(ipaddress.ip_address(domain_or_ip))
except ValueError:
result = socket.getaddrinfo(domain_or_ip, 53)
if len(result) > 0:
return result[0][4][0]
else:
raise ValueError("Could not lookup dns ip for {}".format(domain_or_ip))
pass
# No valid ip found so far, try to resolve
result = socket.getaddrinfo(domain_or_ip, 53)
if len(result) > 0:
return result[0][4][0]
else:
raise ValueError("Could not lookup dns ip for {}".format(domain_or_ip))
@staticmethod
def _get_soa(domain, nameserver=None):