Fix signing for requests with the soap binding

Signed-off-by: Ivan Kanakarakis <ivan.kanak@gmail.com>

Author: c00kiemon5ter

src/saml2/client.py

@@ -152,8 +152,8 @@ def prepare_for_negotiated_authenticate(
             # XXX   ^through self.create_authn_request(...)
             # XXX - sign_redirect will add the signature to the query params
             # XXX   ^through self.apply_binding(...)
-            sign_post = False if binding == BINDING_HTTP_REDIRECT else sign
-            sign_redirect = False if binding == BINDING_HTTP_POST and sign else sign
+            sign_redirect = sign and binding == BINDING_HTTP_REDIRECT
+            sign_post = sign and not sign_redirect
 
             reqid, request = self.create_authn_request(
                 destination=destination,
@@ -318,10 +318,8 @@ def do_logout(
                 session_indexes = None
 
             sign = sign if sign is not None else self.logout_requests_signed
-            sign_post = sign and (
-                binding == BINDING_HTTP_POST or binding == BINDING_SOAP
-            )
             sign_redirect = sign and binding == BINDING_HTTP_REDIRECT
+            sign_post = sign and not sign_redirect
 
             log_report = {
                 "message": "Invoking SLO on entity",

src/saml2/request.py

@@ -2,7 +2,6 @@
 
 from saml2 import time_util
 from saml2 import BINDING_HTTP_REDIRECT
-from saml2 import BINDING_HTTP_POST
 from saml2.attribute_converter import to_local
 from saml2.s_utils import OtherError
 
@@ -55,22 +54,22 @@ def _loads(
         logger.debug("xmlstr: %s, relay_state: %s, sigalg: %s, signature: %s",
                      self.xmlstr, relay_state, sigalg, signature)
 
-        signed_post = must and binding == BINDING_HTTP_POST
-        signed_redirect = must and binding == BINDING_HTTP_REDIRECT
+        sign_redirect = must and binding == BINDING_HTTP_REDIRECT
+        sign_post = must and not sign_redirect
         incorrectly_signed = IncorrectlySigned("Request was not signed correctly")
 
         try:
             self.message = self.signature_check(
                 xmldata,
                 origdoc=origdoc,
-                must=signed_post,
+                must=sign_post,
                 only_valid_cert=only_valid_cert,
             )
         except Exception as e:
             self.message = None
             raise incorrectly_signed from e
 
-        if signed_redirect:
+        if sign_redirect:
             if sigalg is None or signature is None:
                 raise incorrectly_signed