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-rw-r--r--synapse/handlers/saml_handler.py13
1 files changed, 12 insertions, 1 deletions
diff --git a/synapse/handlers/saml_handler.py b/synapse/handlers/saml_handler.py
index 90e69b49ee..7f411b53b9 100644
--- a/synapse/handlers/saml_handler.py
+++ b/synapse/handlers/saml_handler.py
@@ -32,6 +32,7 @@ from synapse.types import (
     mxid_localpart_allowed_characters,
 )
 from synapse.util.async_helpers import Linearizer
+from synapse.util.iterutils import chunk_seq
 
 logger = logging.getLogger(__name__)
 
@@ -132,7 +133,17 @@ class SamlHandler:
             logger.warning("SAML2 response was not signed")
             raise SynapseError(400, "SAML2 response was not signed")
 
-        logger.info("SAML2 response: %s", saml2_auth.origxml)
+        logger.debug("SAML2 response: %s", saml2_auth.origxml)
+        for assertion in saml2_auth.assertions:
+            # kibana limits the length of a log field, whereas this is all rather
+            # useful, so split it up.
+            count = 0
+            for part in chunk_seq(str(assertion), 10000):
+                logger.info(
+                    "SAML2 assertion: %s%s", "(%i)..." % (count,) if count else "", part
+                )
+                count += 1
+
         logger.info("SAML2 mapped attributes: %s", saml2_auth.ava)
 
         self._outstanding_requests_dict.pop(saml2_auth.in_response_to, None)