112 lines
4 KiB
Python
112 lines
4 KiB
Python
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"""SAML Identity 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 django.shortcuts import reverse
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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.providers.saml.models import SAMLProvider
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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_BINDING_REDIRECT,
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SAML_NAME_ID_FORMAT_EMAIL,
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SAML_NAME_ID_FORMAT_PRESISTENT,
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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 Identity Provider Metadata Processor"""
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provider: SAMLProvider
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http_request: HttpRequest
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def __init__(self, provider: SAMLProvider, request: HttpRequest):
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self.provider = provider
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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 provider"""
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if self.provider.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.provider.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_PRESISTENT,
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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 get_bindings(self) -> Iterator[Element]:
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"""Get all Bindings supported"""
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binding_url_map = {
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SAML_BINDING_POST: self.http_request.build_absolute_uri(
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reverse(
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"passbook_providers_saml:sso-post",
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kwargs={"application_slug": self.provider.application.slug},
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)
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),
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SAML_BINDING_REDIRECT: self.http_request.build_absolute_uri(
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reverse(
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"passbook_providers_saml:sso-redirect",
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kwargs={"application_slug": self.provider.application.slug},
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)
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),
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}
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for binding, url in binding_url_map.items():
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element = Element(f"{{{NS_SAML_METADATA}}}SingleSignOnService")
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element.attrib["Binding"] = binding
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element.attrib["Location"] = url
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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.provider.issuer
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idp_sso_descriptor = SubElement(
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entity_descriptor, f"{{{NS_SAML_METADATA}}}IDPSSODescriptor"
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)
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idp_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 is not None:
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idp_sso_descriptor.append(signing_descriptor)
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for name_id_format in self.get_name_id_formats():
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idp_sso_descriptor.append(name_id_format)
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for binding in self.get_bindings():
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idp_sso_descriptor.append(binding)
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return ElementTree.tostring(entity_descriptor).decode()
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