6bf1f57fc1
if a nameserver does not respond, we flag it in the database (available = False) and stop talking to it for 5 minutes. after 5 minutes, we flag it available = True again and retry talking to it (and if not successful, flag it as unavailable again). this avoids a unresponsive UI as we do a lot of ns queries from the templates to get v4 and v6 addresses of our hosts from master nameservers. we log a warning when setting unavailable and a info when setting available.
143 lines
4.9 KiB
Python
143 lines
4.9 KiB
Python
import re
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from datetime import datetime
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import dns.resolver
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from django.db import models
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from django.contrib.auth.models import User
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from django.core.exceptions import ValidationError
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from django.core.validators import RegexValidator
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from django.conf import settings
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from django.db.models.signals import post_delete
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from django.contrib.auth.hashers import make_password
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from . import dnstools
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class BlacklistedDomain(models.Model):
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domain = models.CharField(
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max_length=256,
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unique=True,
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help_text='Blacklisted domain. Evaluated as regex (search).')
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last_update = models.DateTimeField(auto_now=True)
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created = models.DateTimeField(auto_now_add=True)
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created_by = models.ForeignKey(User, blank=True, null=True)
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def __unicode__(self):
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return u"%s" % (self.domain, )
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def domain_blacklist_validator(value):
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for bd in BlacklistedDomain.objects.all():
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if re.search(bd.domain, value):
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raise ValidationError(u'This domain is not allowed')
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UPDATE_ALGORITHMS = (
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('HMAC_SHA512', 'HMAC_SHA512'),
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('HMAC_SHA384', 'HMAC_SHA384'),
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('HMAC_SHA256', 'HMAC_SHA256'),
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('HMAC_SHA224', 'HMAC_SHA224'),
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('HMAC_SHA1', 'HMAC_SHA1'),
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('HMAC_MD5', 'HMAC_MD5'),
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)
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class Domain(models.Model):
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domain = models.CharField(max_length=256, unique=True)
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nameserver_ip = models.GenericIPAddressField(
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max_length=256,
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help_text="IP where the dynamic updates for this domain will be sent to")
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nameserver_update_key = models.CharField(max_length=256)
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nameserver_update_algorithm = models.CharField(
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max_length=256, default='HMAC_SHA512', choices=UPDATE_ALGORITHMS)
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# XXX rename available_for_everyone to public
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available_for_everyone = models.BooleanField(default=False)
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# available means "nameserver for domain operating and reachable" -
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# gets set to False if we have trouble reaching the nameserver
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available = models.BooleanField(default=True)
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last_update = models.DateTimeField(auto_now=True)
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created = models.DateTimeField(auto_now_add=True)
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created_by = models.ForeignKey(User, blank=True, null=True)
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def __unicode__(self):
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return u"%s" % (self.domain, )
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class Host(models.Model):
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subdomain = models.CharField(max_length=256, validators=[
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RegexValidator(
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regex=r'^(([a-z0-9][a-z0-9\-]*[a-z0-9])|[a-z0-9])$',
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message='Invalid subdomain: only "a-z", "0-9" and "-" is allowed'
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),
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domain_blacklist_validator])
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domain = models.ForeignKey(Domain)
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update_secret = models.CharField(max_length=256) # gets hashed on save
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comment = models.CharField(
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max_length=256, default='', blank=True, null=True)
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last_update = models.DateTimeField(auto_now=True)
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last_api_update = models.DateTimeField(blank=True, null=True)
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created = models.DateTimeField(auto_now_add=True)
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created_by = models.ForeignKey(
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settings.AUTH_USER_MODEL, related_name='hosts')
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def __unicode__(self):
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return u"%s.%s - %s" % (
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self.subdomain, self.domain.domain, self.comment)
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class Meta(object):
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unique_together = (('subdomain', 'domain'),)
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def get_fqdn(self):
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return '%s.%s' % (self.subdomain, self.domain.domain)
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@classmethod
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def filter_by_fqdn(cls, fqdn, **kwargs):
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# Assuming subdomain has no dots (.) the fqdn is split at the first dot
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splitted = fqdn.split('.', 1)
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if not len(splitted) == 2:
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raise NotImplemented("FQDN has to contain a dot")
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return Host.objects.filter(
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subdomain=splitted[0], domain__domain=splitted[1], **kwargs)
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def getIPv4(self):
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try:
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return dnstools.query_ns(self.get_fqdn(), 'A', origin=self.domain.domain)
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except (dns.resolver.NXDOMAIN, dns.resolver.NoAnswer, dns.resolver.NoNameservers, dns.resolver.Timeout,
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dnstools.NameServerNotAvailable):
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return 'error'
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def getIPv6(self):
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try:
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return dnstools.query_ns(self.get_fqdn(), 'AAAA', origin=self.domain.domain)
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except (dns.resolver.NXDOMAIN, dns.resolver.NoAnswer, dns.resolver.NoNameservers, dns.resolver.Timeout,
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dnstools.NameServerNotAvailable):
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return 'error'
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def poke(self):
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self.last_api_update = datetime.now()
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self.save()
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def generate_secret(self):
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# note: we use a quick hasher for the update_secret as expensive
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# more modern hashes might put too much load on the servers. also
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# many update clients might use http without ssl, so it is not too
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# secure anyway.
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secret = User.objects.make_random_password()
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self.update_secret = make_password(
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secret,
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hasher='sha1'
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)
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self.save()
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return secret
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def post_delete_host(sender, **kwargs):
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obj = kwargs['instance']
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dnstools.delete(obj.get_fqdn(), origin=obj.domain.domain)
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post_delete.connect(post_delete_host, sender=Host)
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