95 lines
3.4 KiB
Python
95 lines
3.4 KiB
Python
"""SAML Service Provider Metadata Processor"""
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from typing import Iterator, Optional
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from defusedxml import ElementTree
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from django.http import HttpRequest
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from lxml.etree import Element, SubElement # nosec
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from signxml.util import strip_pem_header
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from passbook.sources.saml.models import SAMLSource
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from passbook.sources.saml.processors.constants import (
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NS_MAP,
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NS_SAML_METADATA,
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NS_SIGNATURE,
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SAML_BINDING_POST,
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SAML_NAME_ID_FORMAT_EMAIL,
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SAML_NAME_ID_FORMAT_PERSISTENT,
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SAML_NAME_ID_FORMAT_TRANSIENT,
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SAML_NAME_ID_FORMAT_WINDOWS,
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SAML_NAME_ID_FORMAT_X509,
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)
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class MetadataProcessor:
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"""SAML Service Provider Metadata Processor"""
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source: SAMLSource
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http_request: HttpRequest
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def __init__(self, source: SAMLSource, request: HttpRequest):
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self.source = source
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self.http_request = request
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def get_signing_key_descriptor(self) -> Optional[Element]:
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"""Get Singing KeyDescriptor, if enabled for the source"""
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if self.source.signing_kp:
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key_descriptor = Element(f"{{{NS_SAML_METADATA}}}KeyDescriptor")
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key_descriptor.attrib["use"] = "signing"
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key_info = SubElement(key_descriptor, f"{{{NS_SIGNATURE}}}KeyInfo")
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x509_data = SubElement(key_info, f"{{{NS_SIGNATURE}}}X509Data")
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x509_certificate = SubElement(
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x509_data, f"{{{NS_SIGNATURE}}}X509Certificate"
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)
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x509_certificate.text = strip_pem_header(
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self.source.signing_kp.certificate_data.replace("\r", "")
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).replace("\n", "")
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return key_descriptor
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return None
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def get_name_id_formats(self) -> Iterator[Element]:
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"""Get compatible NameID Formats"""
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formats = [
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SAML_NAME_ID_FORMAT_EMAIL,
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SAML_NAME_ID_FORMAT_PERSISTENT,
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SAML_NAME_ID_FORMAT_X509,
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SAML_NAME_ID_FORMAT_WINDOWS,
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SAML_NAME_ID_FORMAT_TRANSIENT,
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]
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for name_id_format in formats:
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element = Element(f"{{{NS_SAML_METADATA}}}NameIDFormat")
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element.text = name_id_format
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yield element
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def build_entity_descriptor(self) -> str:
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"""Build full EntityDescriptor"""
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entity_descriptor = Element(
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f"{{{NS_SAML_METADATA}}}EntityDescriptor", nsmap=NS_MAP
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)
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entity_descriptor.attrib["entityID"] = self.source.get_issuer(self.http_request)
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sp_sso_descriptor = SubElement(
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entity_descriptor, f"{{{NS_SAML_METADATA}}}SPSSODescriptor"
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)
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sp_sso_descriptor.attrib[
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"protocolSupportEnumeration"
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] = "urn:oasis:names:tc:SAML:2.0:protocol"
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signing_descriptor = self.get_signing_key_descriptor()
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if signing_descriptor:
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sp_sso_descriptor.append(signing_descriptor)
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for name_id_format in self.get_name_id_formats():
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sp_sso_descriptor.append(name_id_format)
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assertion_consumer_service = SubElement(
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sp_sso_descriptor, f"{{{NS_SAML_METADATA}}}AssertionConsumerService"
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)
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assertion_consumer_service.attrib["isDefault"] = "true"
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assertion_consumer_service.attrib["index"] = "0"
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assertion_consumer_service.attrib["Binding"] = SAML_BINDING_POST
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assertion_consumer_service.attrib["Location"] = self.source.build_full_url(
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self.http_request
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)
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return ElementTree.tostring(entity_descriptor).decode()
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