109 lines
3.7 KiB
Python
109 lines
3.7 KiB
Python
"""SAML AuthnRequest Processor"""
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from typing import Dict
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from django.http import HttpRequest
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from lxml import etree # nosec
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from lxml.etree import Element # nosec
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from signxml import XMLSigner, methods
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from passbook.providers.saml.utils import get_random_id
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from passbook.providers.saml.utils.encoding import deflate_and_base64_encode
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from passbook.providers.saml.utils.time import get_time_string
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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_ASSERTION,
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NS_SAML_PROTOCOL,
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NS_SIGNATURE,
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)
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class RequestProcessor:
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"""SAML AuthnRequest Processor"""
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source: SAMLSource
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http_request: HttpRequest
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relay_state: str
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request_id: str
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issue_instant: str
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def __init__(self, source: SAMLSource, request: HttpRequest, relay_state: str):
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self.source = source
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self.http_request = request
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self.relay_state = relay_state
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self.request_id = get_random_id()
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self.issue_instant = get_time_string()
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def get_issuer(self) -> Element:
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"""Get Issuer Element"""
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issuer = Element(f"{{{NS_SAML_ASSERTION}}}Issuer")
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issuer.text = self.source.get_issuer(self.http_request)
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return issuer
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def get_name_id_policy(self) -> Element:
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"""Get NameID Policy Element"""
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name_id_policy = Element(f"{{{NS_SAML_PROTOCOL}}}NameIDPolicy")
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name_id_policy.text = self.source.name_id_policy
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return name_id_policy
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def get_auth_n(self) -> Element:
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"""Get full AuthnRequest"""
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auth_n_request = Element(f"{{{NS_SAML_PROTOCOL}}}AuthnRequest", nsmap=NS_MAP)
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auth_n_request.attrib[
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"AssertionConsumerServiceURL"
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] = self.source.build_full_url(self.http_request)
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auth_n_request.attrib["Destination"] = self.source.sso_url
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auth_n_request.attrib["ID"] = self.request_id
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auth_n_request.attrib["IssueInstant"] = self.issue_instant
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auth_n_request.attrib["ProtocolBinding"] = self.source.binding_type
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auth_n_request.attrib["Version"] = "2.0"
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# Create issuer object
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auth_n_request.append(self.get_issuer())
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# Create NameID Policy Object
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auth_n_request.append(self.get_name_id_policy())
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return auth_n_request
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def build_auth_n(self) -> str:
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"""Get Signed string representation of AuthN Request
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(used for POST Bindings)"""
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auth_n_request = self.get_auth_n()
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if self.source.signing_kp:
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signed_request = XMLSigner().sign(
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auth_n_request,
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cert=self.source.signing_kp.certificate_data,
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key=self.source.signing_kp.key_data,
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)
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return etree.tostring(signed_request).decode()
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return etree.tostring(auth_n_request).decode()
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def build_auth_n_detached(self) -> Dict[str, str]:
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"""Get Dict AuthN Request for Redirect bindings, with detached
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Signature"""
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auth_n_request = self.get_auth_n()
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response_dict = {
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"SAMLRequest": deflate_and_base64_encode(
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etree.tostring(auth_n_request).decode()
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),
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"RelayState": self.relay_state
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}
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if self.source.signing_kp:
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signer = XMLSigner(methods.detached)
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signature = signer.sign(
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auth_n_request,
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cert=self.source.signing_kp.certificate_data,
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key=self.source.signing_kp.key_data,
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)
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signature_value = signature.find(
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f".//{{{NS_SIGNATURE}}}SignatureValue"
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).text
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response_dict["Signature"] = signature_value
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response_dict["SigAlg"] = signer.sign_alg
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return response_dict
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