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authentik/passbook/providers/saml/xml_render.py

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"""Functions for creating XML output."""
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from __future__ import annotations
from typing import TYPE_CHECKING
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from structlog import get_logger
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from passbook.lib.utils.template import render_to_string
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from passbook.providers.saml.xml_signing import (get_signature_xml,
sign_with_signxml)
if TYPE_CHECKING:
from passbook.providers.saml.models import SAMLProvider
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LOGGER = get_logger()
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def _get_attribute_statement(params):
"""Inserts AttributeStatement, if we have any attributes.
Modifies the params dict.
PRE-REQ: params['SUBJECT'] has already been created (usually by a call to
_get_subject()."""
attributes = params.get('ATTRIBUTES', [])
if not attributes:
params['ATTRIBUTE_STATEMENT'] = ''
return
# Build complete AttributeStatement.
params['ATTRIBUTE_STATEMENT'] = render_to_string('saml/xml/attributes.xml', {
'attributes': attributes})
def _get_in_response_to(params):
"""Insert InResponseTo if we have a RequestID.
Modifies the params dict."""
# NOTE: I don't like this. We're mixing templating logic here, but the
# current design requires this; maybe refactor using better templates, or
# just bite the bullet and use elementtree to produce the XML; see comments
# in xml_templates about Canonical XML.
request_id = params.get('REQUEST_ID', None)
if request_id:
params['IN_RESPONSE_TO'] = 'InResponseTo="%s" ' % request_id
else:
params['IN_RESPONSE_TO'] = ''
def _get_subject(params):
"""Insert Subject. Modifies the params dict."""
params['SUBJECT_STATEMENT'] = render_to_string('saml/xml/subject.xml', params)
def get_assertion_xml(template, parameters, signed=False):
"""Get XML for Assertion"""
# Reset signature.
params = {}
params.update(parameters)
params['ASSERTION_SIGNATURE'] = ''
_get_in_response_to(params)
_get_subject(params) # must come before _get_attribute_statement()
_get_attribute_statement(params)
unsigned = render_to_string(template, params)
# LOGGER.debug('Unsigned: %s', unsigned)
if not signed:
return unsigned
# Sign it.
signature_xml = get_signature_xml()
params['ASSERTION_SIGNATURE'] = signature_xml
return render_to_string(template, params)
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def get_response_xml(parameters, saml_provider: SAMLProvider, assertion_id=''):
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"""Returns XML for response, with signatures, if signed is True."""
# Reset signatures.
params = {}
params.update(parameters)
params['RESPONSE_SIGNATURE'] = ''
_get_in_response_to(params)
raw_response = render_to_string('saml/xml/response.xml', params)
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# LOGGER.debug('Unsigned: %s', unsigned)
if not saml_provider.signing:
return raw_response
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signature_xml = get_signature_xml()
params['RESPONSE_SIGNATURE'] = signature_xml
# LOGGER.debug("Raw response: %s", raw_response)
signed = sign_with_signxml(
saml_provider.signing_key, raw_response, saml_provider.signing_cert,
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reference_uri=assertion_id)
return signed