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authentik/passbook/saml_idp/xml_signing.py

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"""Signing code goes here."""
from logging import getLogger
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization
from defusedxml import ElementTree
from signxml import XMLSigner
from signxml.util import strip_pem_header
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from passbook.lib.config import CONFIG
from passbook.lib.utils.template import render_to_string
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LOGGER = getLogger(__name__)
def load_certificate(strip=False):
"""Get Public key from config"""
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cert = CONFIG.y('saml_idp.certificate', '')
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if strip:
return strip_pem_header(cert.replace('\r', '')).replace('\n', '')
return cert
def load_private_key():
"""Get Private Key from config"""
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return CONFIG.y('saml_idp.key', '')
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def sign_with_signxml(private_key, data, cert, reference_uri=None):
"""Sign Data with signxml"""
key = serialization.load_pem_private_key(
str.encode('\n'.join([x.strip() for x in private_key.split('\n')])),
password=None, backend=default_backend())
root = ElementTree.fromstring(data)
signer = XMLSigner(c14n_algorithm='http://www.w3.org/2001/10/xml-exc-c14n#')
return ElementTree.tostring(signer.sign(root, key=key, cert=cert, reference_uri=reference_uri))
def get_signature_xml():
"""Returns XML Signature for subject."""
return render_to_string('saml/xml/signature.xml', {})