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"""
IR Database, Django-style.
This is the back-end code's interface to the database. It's intended
to be usable by command line programs and other scripts, not just
Django GUI code, so be careful.
$Id$
Copyright (C) 2011 Internet Systems Consortium ("ISC")
Permission to use, copy, modify, and 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.
"""
import django.db.models
###
class ChoiceMap(dict):
"""
Map construct to simplify enumerated types in Django models.
"""
def __init__(self, *tags):
dict.__init__(self)
for i, tag in enumerate(tags, 1):
self[tag] = i
@property
def choices(self):
return tuple((y, x) for (x, y) in self.iteritems())
class HandleField(django.db.models.CharField):
"""
A handle field type.
"""
def __init__(self, *args, **kwargs):
kwargs["max_length"] = 120
django.db.models.CharField.__init__(self, *args, **kwargs)
class BinaryField(django.db.models.Field):
"""
A raw binary field type for Django models. Yes, I know this is
wrong, but breaking out all the ASN.1 isn't practical, and encoding
binary data as Base64 text doesn't seem much of an improvement.
"""
description = "Raw binary data"
def db_type(self, connection):
if connection.settings_dict['ENGINE'] == "django.db.backends.posgresql":
return "bytea"
else:
return "BLOB"
## @var ip_version_map
# Custom choice map for IP version enumerations, so we can use the
# obvious numeric values in the database, which is a bit easier on
# anybody reading the raw SQL.
#
ip_version_map = { "IPv4" : 4, "IPv6" : 6 }
## @var ip_version_choices
# Choice argument for fields implementing IP version numbers.
#
ip_version_choices = tuple((y, x) for (x, y) in ip_version_map.iteritems())
###
class Identity(django.db.models.Model):
handle = HandleField(unique = True)
class CA(django.db.models.Model):
identity = django.db.models.ForeignKey(Identity, related_name = "bpki_certificates")
purpose_map = ChoiceMap("resources", "servers")
purpose = django.db.models.PositiveSmallIntegerField(choices = purpose_map.choices)
next_serial = django.db.models.BigIntegerField(default = 1)
next_crl_number = django.db.models.BigIntegerField(default = 1)
last_crl_update = django.db.models.DateTimeField()
next_crl_update = django.db.models.DateTimeField()
class Meta:
unique_together = ("identity", "purpose")
class Certificate(django.db.models.Model):
certificate = BinaryField()
class Meta:
abstract = True
def get_cert(self):
return rpki.x509.X509(DER = self.certificate)
def generate_certificate(self):
# This is sort of vaguely the right idea, but most of it probably
# ought to be a method of the CA, not the object being certified,
# and the rest doesn't yet cover all the different kinds of
# certificates we need to support.
# Perhaps something where each specialized class has its own
# generate_certificate() method which is mostly just a wrapper for
# a call to the CA object with the right parameters to get the CA
# to issue the certificate. Seems about right. Not awake enough
# to write it now.
cacert = self.issuer.keyed_certificates.filter(purpose = KeyedCertificate.purpose_map["ca"])
subject_name, subject_key = self.get_certificate_subject()
cer = cacert.get_cert()
key = cacert.get_key()
result = cer.bpki_certify(key, subject_name, subject_key, ca.next_serial,
# This needs to be configurable
rpki.sundial.now() + rpki.sundial.timedelta(days = 60),
# This is (at least) per-class, not universal
pathLenConstraint = 0,
# This is per-class too
ca = True)
self.ca.next_serial += 1
self.certificate = result
class CrossCertification(Certificate):
handle = HandleField()
ta = BinaryField()
class Meta:
abstract = True
unique_together = ("issuer", "handle")
def get_certificate_subject(self):
ta = rpki.x509.X509(DER = self.ta)
return ta.getSubject(), ta.getPublicKey()
class Revocation(django.db.models.Model):
issuer = django.db.models.ForeignKey(CA, related_name = "revocations")
serial = django.db.models.BigIntegerField()
revoked = django.db.models.DateTimeField()
expires = django.db.models.DateTimeField()
class Meta:
unique_together = ("issuer", "serial")
class KeyedCertificate(Certificate):
issuer = django.db.models.ForeignKey(CA, related_name = "keyed_certificates")
purpose_map = ChoiceMap("ca", "rpkid", "pubd", "irdbd", "irbe", "rootd")
purpose = django.db.models.PositiveSmallIntegerField(choices = purpose_map.choices)
private_key = BinaryField()
class Meta:
unique_together = ("issuer", "purpose")
def get_key(self):
return rpki.x509.RSA(DER = self.private_key)
class BSC(Certificate):
issuer = django.db.models.ForeignKey(CA, related_name = "bscs")
handle = HandleField()
pkcs10 = BinaryField()
class Meta:
unique_together = ("issuer", "handle")
class Child(CrossCertification):
issuer = django.db.models.ForeignKey(CA, related_name = "children")
name = django.db.models.TextField(null = True, blank = True)
valid_until = django.db.models.DateTimeField()
class ChildASN(django.db.models.Model):
child = django.db.models.ForeignKey(Child, related_name = "asns")
start_as = django.db.models.BigIntegerField()
end_as = django.db.models.BigIntegerField()
class Meta:
unique_together = ("child", "start_as", "end_as")
class ChildNet(django.db.models.Model):
child = django.db.models.ForeignKey(Child, related_name = "address_ranges")
start_ip = django.db.models.CharField(max_length = 40)
end_ip = django.db.models.CharField(max_length = 40)
version_map = ip_version_map
version = django.db.models.PositiveSmallIntegerField(choices = ip_version_choices)
class Meta:
unique_together = ("child", "start_ip", "end_ip", "version")
class Parent(CrossCertification):
issuer = django.db.models.ForeignKey(CA, related_name = "parents")
parent_handle = HandleField()
child_handle = HandleField()
service_uri = django.db.models.CharField(max_length = 255)
repository_type_map = ChoiceMap("none", "offer", "referral")
repository_type = django.db.models.PositiveSmallIntegerField(choices = repository_type_map.choices)
referrer = HandleField(null = True, blank = True)
referral_authorization = BinaryField(null = True, blank = True)
class ROARequest(django.db.models.Model):
identity = django.db.models.ForeignKey(Identity, related_name = "roa_requests")
asn = django.db.models.BigIntegerField()
class ROARequestPrefix(django.db.models.Model):
roa_request = django.db.models.ForeignKey(ROARequest, related_name = "prefixes")
version_map = ip_version_map
version = django.db.models.PositiveSmallIntegerField(choices = ip_version_choices)
prefix = django.db.models.CharField(max_length = 40)
prefixlen = django.db.models.PositiveSmallIntegerField()
max_prefixlen = django.db.models.PositiveSmallIntegerField()
class Meta:
unique_together = ("roa_request", "version", "prefix", "prefixlen", "max_prefixlen")
class GhostbusterRequest(django.db.models.Model):
identity = django.db.models.ForeignKey(Identity, related_name = "ghostbuster_requests")
parent = django.db.models.ForeignKey(Parent, related_name = "ghostbuster_requests", null = True)
vcard = django.db.models.TextField()
class Repository(CrossCertification):
issuer = django.db.models.ForeignKey(CA, related_name = "repositories")
client_handle = HandleField()
service_uri = django.db.models.CharField(max_length = 255)
sia_base = django.db.models.TextField()
parent = django.db.models.OneToOneField(Parent, related_name = "repository")
class Client(CrossCertification):
issuer = django.db.models.ForeignKey(CA, related_name = "clients")
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