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import base64
import logging
import re
import subprocess
try:
from defusedxml import ElementTree as ET
except ModuleNotFoundError:
import xml.etree.ElementTree as ET
from collections import defaultdict
from pathlib import Path
from typing import Dict
from cryptography import x509
from . import fields, models
log = logging.getLogger("__name__")
NS = "http://uri.etsi.org/02231/v2#"
NS_XMLDSIG = "http://www.w3.org/2000/09/xmldsig#"
NS_ADDTYPES = "http://uri.etsi.org/02231/v2/additionaltypes#"
class OtherInformation(models.Model):
__xmlns__ = NS
tsl_type = fields.NotImplementedField(xmltag="TSLType", xmlns=NS)
scheme_territory = fields.StringField(null=True, xmlns=NS)
mime_type = fields.StringField(null=True, xmlns=NS_ADDTYPES)
scheme_operator_name = fields.NotImplementedField(xmlns=NS)
scheme_type_community_rules = fields.NotImplementedField(xmlns=NS)
class AdditionalInformation(models.Model):
__xmlns__ = NS
other_information = fields.ModelListField(OtherInformation)
class OtherTSLPointer(models.Model):
__xmlns__ = NS
tsl_location = fields.StringField(xmltag="TSLLocation", xmlns=NS)
service_digital_identities = fields.NotImplementedField(xmlns=NS)
additional_information = AdditionalInformation
class PointersToOtherTSL(models.Model):
__xmlns__ = NS
other_tsl_pointer = fields.ModelListField(OtherTSLPointer)
class SchemeInformation(models.Model):
__xmlns__ = NS
pointers_to_other_tsl = fields.ModelField(PointersToOtherTSL)
tsl_version_identifier = fields.NotImplementedField(xmltag="TSLVersionIdentifier", xmlns=NS)
tsl_sequence_number = fields.NotImplementedField(xmltag="TSLSequenceNumber", xmlns=NS)
tsl_type = fields.NotImplementedField(xmltag="TSLType", xmlns=NS)
scheme_operator_name = fields.NotImplementedField(xmlns=NS)
scheme_operator_address = fields.NotImplementedField(xmlns=NS)
scheme_information_uri = fields.NotImplementedField(xmltag="SchemeInformationURI", xmlns=NS)
scheme_name = fields.NotImplementedField(xmlns=NS)
status_determination_approach = fields.NotImplementedField(xmlns=NS)
scheme_type_community_rules = fields.NotImplementedField(xmlns=NS)
scheme_territory = fields.NotImplementedField(xmlns=NS)
policy_or_legal_notice = fields.NotImplementedField(xmlns=NS)
historical_information_period = fields.NotImplementedField(xmlns=NS)
list_issue_date_time = fields.NotImplementedField(xmlns=NS)
next_update = fields.NotImplementedField(xmlns=NS)
distribution_points = fields.NotImplementedField(xmlns=NS)
class TSPInformation(models.Model):
__xmlns__ = NS
tsp_name = fields.NotImplementedField(xmltag="TSPName", xmlns=NS)
tsp_trade_name = fields.NotImplementedField(xmltag="TSPTradeName", xmlns=NS)
tsp_address = fields.NotImplementedField(xmltag="TSPAddress", xmlns=NS)
tsp_information_url = fields.NotImplementedField(xmltag="TSPInformationURI", xmlns=NS)
class DigitalId(models.Model):
__xmlns__ = NS
x509_subject_name = fields.StringField(xmltag="X509SubjectName", xmlns=NS, null=True)
x509_ski = fields.StringField(xmltag="X509SKI", xmlns=NS, null=True)
x509_certificate = fields.StringField(xmltag="X509Certificate", xmlns=NS, null=True)
class ServiceDigitalIdentity(models.Model):
__xmlns__ = NS
digital_id = fields.ModelListField(DigitalId)
class ServiceInformation(models.Model):
__xmlns__ = NS
service_type_identifier = fields.StringField(xmlns=NS)
service_name = fields.NotImplementedField(xmlns=NS)
service_digital_identity = ServiceDigitalIdentity
service_status = fields.StringField(xmlns=NS)
status_starting_time = fields.NotImplementedField(xmlns=NS)
service_information_extensions = fields.NotImplementedField(xmlns=NS)
class TSPService(models.Model):
__xmlns__ = NS
service_information = ServiceInformation
service_history = fields.NotImplementedField(xmlns=NS)
class TSPServices(models.Model):
__xmlns__ = NS
tsp_service = fields.ModelListField(TSPService)
class TrustServiceProvider(models.Model):
__xmlns__ = NS
tsp_information = TSPInformation
tsp_services = TSPServices
class TrustServiceProviderList(models.Model):
__xmlns__ = NS
trust_service_provider = fields.ModelListField(TrustServiceProvider)
class TrustServiceStatusList(models.Model):
__xmlns__ = NS
scheme_information = SchemeInformation
signature = fields.NotImplementedField(xmlns=NS_XMLDSIG)
trust_service_provider_list = TrustServiceProviderList
def get_tsl_pointer_by_territory(self, territory):
for other_tsl_pointer in self.scheme_information.pointers_to_other_tsl.other_tsl_pointer:
territory = None
for oi in other_tsl_pointer.additional_information.other_information:
if oi.scheme_territory is not None:
territory = oi.scheme_territory
break
if territory != "IT":
continue
return other_tsl_pointer.tsl_location
def auto_from_etree(root):
expected_tag = "{{{}}}TrustServiceStatusList".format(NS)
if root.tag != expected_tag:
raise RuntimeError("Root element {} is not {}".format(root.tag, expected_tag))
res = TrustServiceStatusList()
res.from_etree(root)
return res
def load_url(url: str):
"""
Return a TrustedServiceStatusList instance from the XML downloaded from the
given URL
"""
import requests
res = requests.get(url)
res.raise_for_status()
root = ET.fromstring(res.content)
return auto_from_etree(root)
def load_certs() -> Dict[str, x509.Certificate]:
"""
Download trusted list certificates for Italy, parse them and return a dict
mapping certificate names good for use as file names to cryptography.x509
certificates
"""
re_clean_fname = re.compile(r"[^A-Za-z0-9_-]")
eu_url = "https://ec.europa.eu/information_society/policy/esignature/trusted-list/tl-mp.xml"
log.info("Downloading EU index from %s", eu_url)
eu_tl = load_url(eu_url)
it_url = eu_tl.get_tsl_pointer_by_territory("IT")
log.info("Downloading IT data from %s", it_url)
trust_service_status_list = load_url(it_url)
by_name = defaultdict(list)
for tsp in trust_service_status_list.trust_service_provider_list.trust_service_provider:
for tsp_service in tsp.tsp_services.tsp_service:
si = tsp_service.service_information
if si.service_status not in (
"http://uri.etsi.org/TrstSvc/TrustedList/Svcstatus/recognisedatnationallevel",
"http://uri.etsi.org/TrstSvc/TrustedList/Svcstatus/granted"):
continue
if si.service_type_identifier not in (
"http://uri.etsi.org/TrstSvc/Svctype/CA/QC",):
continue
# print("identifier", si.service_type_identifier)
# print("status", si.service_status)
cert = []
sn = []
for di in si.service_digital_identity.digital_id:
if di.x509_subject_name is not None:
sn.append(di.x509_subject_name)
# if di.x509_ski is not None:
# print(" SKI:", di.x509_ski)
if di.x509_certificate is not None:
from cryptography import x509
from cryptography.hazmat.backends import default_backend
der = base64.b64decode(di.x509_certificate)
cert.append(x509.load_der_x509_certificate(der, default_backend()))
if len(cert) == 0:
raise RuntimeError("{} has no certificates".format(sn))
elif len(cert) > 1:
raise RuntimeError("{} has {} certificates".format(sn, len(cert)))
else:
from cryptography.x509.oid import NameOID
cert = cert[0]
cn = cert.subject.get_attributes_for_oid(NameOID.COMMON_NAME)[0].value
# print("sn", sn)
# print(cert)
# print("full cn", cert.subject.get_attributes_for_oid(NameOID.COMMON_NAME))
# print("cn", cn)
fname = re_clean_fname.sub("_", cn)
by_name[fname].append(cert)
res = {}
for name, certs in by_name.items():
if len(certs) == 1:
if name in res:
raise RuntimeError("{} already in result".format(name))
res[name] = certs[0]
else:
for idx, cert in enumerate(certs, start=1):
idxname = name + "_a38_{}".format(idx)
if idxname in res:
raise RuntimeError("{} already in result".format(name))
res[idxname] = cert
return res
def update_capath(destdir: Path, remove_old=False):
from cryptography.hazmat.primitives import serialization
certs = load_certs()
if destdir.is_dir():
current = set(c.name for c in destdir.iterdir() if c.name.endswith(".crt"))
else:
current = set()
destdir.mkdir(parents=True)
for name, cert in certs.items():
fname = name + ".crt"
current.discard(fname)
pathname = destdir / fname
with pathname.open(mode="wb") as fd:
fd.write(cert.public_bytes(serialization.Encoding.PEM))
log.info("%s: written", pathname)
if remove_old:
for fname in current:
pathname = destdir / fname
pathname.unlink()
log.info("%s: removed", pathname)
subprocess.run(["openssl", "rehash", destdir], check=True)
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