Hi,

We've got CAS 6.6.x running beautifully with delegated IDP logins to 
multiple SAML providers, but the most recent one we've had to integrate 
with is causing me some headaches.

The initial redirect works fine, but when it comes back CAS displays the 
SAML message but then fails to decrypt the SAML message and I can't figure 
out why - has anyone come across anything similar before?

Chris

Logs.. 

63ff8111b2f8  [1;31m2023-03-30 20:01:28,342 ERROR 
[org.apereo.cas.web.flow.actions.DelegatedClientAuthenticationAction] - <No 
valid subject assertion found in response 
63ff8111b2f8  [1;31m2023-03-30 20:01:28,341 ERROR 
[org.pac4j.saml.sso.impl.SAML2AuthnResponseValidator] - <Decryption of 
assertion failed, continue with the next one> [m 
63ff8111b2f8  [1;31m2023-03-30 20:01:28,341 ERROR 
[org.opensaml.saml.saml2.encryption.Decrypter] - <SAML Decrypter 
encountered an error decrypting element content: Failed to decrypt 
EncryptedData> [m 
63ff8111b2f8  [1;31m2023-03-30 20:01:28,341 ERROR 
[org.opensaml.xmlsec.encryption.support.Decrypter] - <Failed to decrypt 
EncryptedData using either EncryptedData KeyInfoCredentialResolver or 
EncryptedKeyResolver + EncryptedKey KeyInfoCredentialResolver> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,341 DEBUG 
[org.opensaml.xmlsec.encryption.support.Decrypter] - <Failed to decrypt 
EncryptedData using EncryptedKeyResolver> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,341 DEBUG 
[org.opensaml.xmlsec.encryption.support.ChainingEncryptedKeyResolver$ChainingIterator]
 
- <No more resolvers available in the resolver chain> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,341 DEBUG 
[org.opensaml.xmlsec.encryption.support.ChainingEncryptedKeyResolver$ChainingIterator]
 
- <Getting key iterator from next resolver: class 
org.opensaml.xmlsec.encryption.support.SimpleRetrievalMethodEncryptedKeyResolver>
 [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,341 DEBUG 
[org.opensaml.xmlsec.encryption.support.ChainingEncryptedKeyResolver$ChainingIterator]
 
- <Getting key iterator from next resolver: class 
org.opensaml.saml.saml2.encryption.EncryptedElementTypeEncryptedKeyResolver> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,341 DEBUG 
[org.opensaml.xmlsec.encryption.support.Decrypter] - <Attempt to decrypt 
EncryptedData using key extracted from EncryptedKey failed: > [m 
63ff8111b2f8  [1;31m2023-03-30 20:01:28,341 ERROR 
[org.opensaml.xmlsec.encryption.support.Decrypter] - <Failed to decrypt 
EncryptedKey, valid decryption key could not be resolved> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,341 DEBUG 
[org.opensaml.xmlsec.encryption.support.Decrypter] - <Attempt to decrypt 
EncryptedKey using credential from KEK KeyInfo resolver failed: > [m 
63ff8111b2f8  [1;31m2023-03-30 20:01:28,341 ERROR 
[org.opensaml.xmlsec.encryption.support.Decrypter] - <Error decrypting 
encrypted key: Unwrapping failed> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,338 DEBUG 
[org.opensaml.xmlsec.algorithm.AlgorithmSupport] - <Saw null algorithm 
include list, nothing to evaluate> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,338 DEBUG 
[org.opensaml.xmlsec.algorithm.AlgorithmSupport] - <Saw null algorithm 
exclude list, nothing to evaluate> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,338 DEBUG 
[org.opensaml.xmlsec.encryption.support.Decrypter] - <Validating algorithm 
URI against include and exclude lists: algorithm: 
http://www.w3.org/2009/xmlenc11#mgf1sha1, included: null, excluded: null> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,338 DEBUG 
[org.opensaml.xmlsec.algorithm.AlgorithmSupport] - <Saw null algorithm 
include list, nothing to evaluate> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,338 DEBUG 
[org.opensaml.xmlsec.algorithm.AlgorithmSupport] - <Saw null algorithm 
exclude list, nothing to evaluate> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,338 DEBUG 
[org.opensaml.xmlsec.encryption.support.Decrypter] - <Validating algorithm 
URI against include and exclude lists: algorithm: 
http://www.w3.org/2000/09/xmldsig#sha1, included: null, excluded: null> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,338 DEBUG 
[org.opensaml.xmlsec.algorithm.AlgorithmSupport] - <Saw null algorithm 
include list, nothing to evaluate> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,338 DEBUG 
[org.opensaml.xmlsec.algorithm.AlgorithmSupport] - <Saw null algorithm 
exclude list, nothing to evaluate> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,338 DEBUG 
[org.opensaml.xmlsec.encryption.support.Decrypter] - <Validating algorithm 
URI against include and exclude lists: algorithm: 
http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p, included: null, excluded: 
null> [m 
63ff8111b2f8  [32m2023-03-30 20:01:28,338 INFO 
[org.opensaml.xmlsec.algorithm.AlgorithmSupport] - <Mapping from algorithm 
URI http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p to key length not 
available> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,338 DEBUG 
[org.opensaml.xmlsec.encryption.support.Decrypter] - <Added decryption key 
algorithm criteria: RSA> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,338 DEBUG 
[org.opensaml.xmlsec.encryption.support.ChainingEncryptedKeyResolver$ChainingIterator]
 
- <Found matching encrypted key: 
org.opensaml.xmlsec.encryption.impl.EncryptedKeyImpl@3c8b684a> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,337 DEBUG 
[org.opensaml.xmlsec.encryption.support.ChainingEncryptedKeyResolver$ChainingIterator]
 
- <Getting key iterator from next resolver: class 
org.opensaml.xmlsec.encryption.support.InlineEncryptedKeyResolver> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,337 DEBUG 
[org.pac4j.saml.sso.impl.SAML2AuthnResponseValidator] - <Comparing issuer 
https://shib.oit.duke.edu/shibboleth-idp against 
https://xxx.xxx.xxx.xxx/shibboleth-idp> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,337 DEBUG 
[org.pac4j.saml.sso.impl.SAML2AuthnResponseValidator] - <Successfully 
validated signature for entity id 
https://shib.oit.duke.edu/shibboleth-idp> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,337 DEBUG 
[org.opensaml.xmlsec.signature.support.impl.BaseSignatureTrustEngine] - 
<Successfully established trust of KeyInfo-derived credential> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,337 DEBUG 
[org.opensaml.security.trust.impl.ExplicitKeyTrustEvaluator] - 
<Successfully validated untrusted credential against trusted key> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,337 DEBUG 
[org.opensaml.xmlsec.signature.support.impl.BaseSignatureTrustEngine] - 
<Attempting to establish trust of KeyInfo-derived credential> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,337 DEBUG 
[org.opensaml.xmlsec.signature.support.impl.BaseSignatureTrustEngine] - 
<Successfully verified signature using KeyInfo-derived credential> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,337 DEBUG 
[org.opensaml.xmlsec.signature.support.impl.BaseSignatureTrustEngine] - 
<Signature validation using candidate credential was successful> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,337 DEBUG 
[org.opensaml.xmlsec.signature.support.impl.provider.ApacheSantuarioSignatureValidationProviderImpl]
 
- <Signature validated with key from supplied credential> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,335 DEBUG 
[org.opensaml.xmlsec.signature.support.impl.provider.ApacheSantuarioSignatureValidationProviderImpl]
 
- <Validation credential key algorithm 'RSA', key instance class 
'sun.security.rsa.RSAPublicKeyImpl'> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,335 DEBUG 
[org.opensaml.xmlsec.signature.support.impl.provider.ApacheSantuarioSignatureValidationProviderImpl]
 
- <Validating signature with signature algorithm URI: 
http://www.w3.org/2001/04/xmldsig-more#rsa-sha256> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,335 DEBUG 
[org.opensaml.xmlsec.signature.support.impl.provider.ApacheSantuarioSignatureValidationProviderImpl]
 
- <Accessing XMLSignature object> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,335 DEBUG 
[org.opensaml.xmlsec.signature.support.impl.provider.ApacheSantuarioSignatureValidationProviderImpl]
 
- <Attempting to validate signature using key from supplied credential> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,335 DEBUG 
[org.opensaml.xmlsec.signature.support.SignatureValidationProvider] - 
<Using a validation provider of implementation: 
org.opensaml.xmlsec.signature.support.impl.provider.ApacheSantuarioSignatureValidationProviderImpl>
 [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,335 DEBUG 
[org.opensaml.security.credential.criteria.impl.EvaluableCredentialCriteriaRegistry]
 
- <Registry could not locate evaluable criteria for criteria class 
org.opensaml.xmlsec.keyinfo.KeyInfoCriterion> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,335 DEBUG 
[org.opensaml.xmlsec.keyinfo.impl.BasicProviderKeyInfoCredentialResolver] - 
<A total of 1 credentials were resolved> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,335 DEBUG 
[org.opensaml.xmlsec.keyinfo.impl.BasicProviderKeyInfoCredentialResolver] - 
<Credentials successfully extracted from child 
{http://www.w3.org/2000/09/xmldsig#}X509Data by provider 
org.opensaml.xmlsec.keyinfo.impl.provider.InlineX509DataProvider> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,335 DEBUG 
[org.opensaml.xmlsec.keyinfo.impl.provider.InlineX509DataProvider] - 
<Single certificate was present, treating as end-entity certificate> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,335 DEBUG 
[org.opensaml.xmlsec.keyinfo.impl.provider.InlineX509DataProvider] - <Found 
0 X509CRLs> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,335 DEBUG 
[org.opensaml.xmlsec.keyinfo.impl.provider.InlineX509DataProvider] - <Found 
1 X509Certificates> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.xmlsec.keyinfo.impl.provider.InlineX509DataProvider] - 
<Attempting to extract credential from an X509Data> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.xmlsec.keyinfo.impl.BasicProviderKeyInfoCredentialResolver] - 
<Processing KeyInfo child {http://www.w3.org/2000/09/xmldsig#}X509Data with 
provider 
org.opensaml.xmlsec.keyinfo.impl.provider.InlineX509DataProvider> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.xmlsec.keyinfo.impl.BasicProviderKeyInfoCredentialResolver] - 
<Provider 
org.opensaml.xmlsec.keyinfo.impl.provider.DEREncodedKeyValueProvider 
doesn't handle objects of type 
{http://www.w3.org/2000/09/xmldsig#}X509Data, skipping> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.xmlsec.keyinfo.impl.BasicProviderKeyInfoCredentialResolver] - 
<Provider org.opensaml.xmlsec.keyinfo.impl.provider.ECKeyValueProvider 
doesn't handle objects of type 
{http://www.w3.org/2000/09/xmldsig#}X509Data, skipping> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.xmlsec.keyinfo.impl.BasicProviderKeyInfoCredentialResolver] - 
<Provider org.opensaml.xmlsec.keyinfo.impl.provider.DSAKeyValueProvider 
doesn't handle objects of type 
{http://www.w3.org/2000/09/xmldsig#}X509Data, skipping> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.xmlsec.keyinfo.impl.BasicProviderKeyInfoCredentialResolver] - 
<Provider org.opensaml.xmlsec.keyinfo.impl.provider.RSAKeyValueProvider 
doesn't handle objects of type 
{http://www.w3.org/2000/09/xmldsig#}X509Data, skipping> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.xmlsec.keyinfo.impl.BasicProviderKeyInfoCredentialResolver] - 
<Processing KeyInfo child with QName: 
{http://www.w3.org/2000/09/xmldsig#}X509Data> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.xmlsec.keyinfo.impl.BasicProviderKeyInfoCredentialResolver] - 
<Found 0 key names: []> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.xmlsec.signature.support.impl.BaseSignatureTrustEngine] - 
<Attempting to verify signature and establish trust using KeyInfo-derived 
credentials> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.security.credential.criteria.impl.EvaluableCredentialCriteriaRegistry]
 
- <Registry located evaluable criteria class 
org.opensaml.security.credential.criteria.impl.EvaluableUsageCredentialCriterion
 
for criteria class org.opensaml.security.criteria.UsageCriterion> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.security.credential.criteria.impl.EvaluableCredentialCriteriaRegistry]
 
- <Registry could not locate evaluable criteria for criteria class 
org.opensaml.saml.criterion.ProtocolCriterion> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.security.credential.criteria.impl.EvaluableCredentialCriteriaRegistry]
 
- <Registry could not locate evaluable criteria for criteria class 
org.opensaml.saml.criterion.EntityRoleCriterion> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.security.credential.criteria.impl.EvaluableCredentialCriteriaRegistry]
 
- <Registry located evaluable criteria class 
org.opensaml.security.credential.criteria.impl.EvaluableEntityIDCredentialCriterion
 
for criteria class org.opensaml.core.criterion.EntityIdCriterion> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.security.credential.criteria.impl.EvaluableCredentialCriteriaRegistry]
 
- <Registry located evaluable criteria class 
org.opensaml.security.credential.criteria.impl.EvaluableKeyAlgorithmCredentialCriterion
 
for criteria class org.opensaml.security.criteria.KeyAlgorithmCriterion> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.saml.security.impl.MetadataCredentialResolver] - <Resolved 
cached credentials from KeyDescriptor object metadata> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.saml.metadata.resolver.impl.PredicateRoleDescriptorResolver] 
- <After predicate filtering 1 RoleDescriptors remain> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.saml.metadata.resolver.impl.PredicateRoleDescriptorResolver] 
- <Attempting to filter candidate RoleDescriptors via resolved 
Predicates> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.saml.metadata.resolver.impl.PredicateRoleDescriptorResolver] 
- <Resolved 1 RoleDescriptor candidates via role criteria, performing 
predicate filtering> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.saml.metadata.resolver.impl.PredicateRoleDescriptorResolver] 
- <Resolved 1 source EntityDescriptors> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.saml.metadata.resolver.impl.AbstractMetadataResolver] - 
<Metadata Resolver DOMMetadataResolver 
org.opensaml.saml.metadata.resolver.impl.DOMMetadataResolver: After 
predicate filtering 1 EntityDescriptors remain> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.saml.metadata.resolver.impl.AbstractMetadataResolver] - 
<Metadata Resolver DOMMetadataResolver 
org.opensaml.saml.metadata.resolver.impl.DOMMetadataResolver: Attempting to 
filter candidate EntityDescriptors via resolved Predicates> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.saml.metadata.resolver.impl.AbstractBatchMetadataResolver] - 
<Metadata Resolver DOMMetadataResolver 
org.opensaml.saml.metadata.resolver.impl.DOMMetadataResolver: Resolved 1 
candidates via EntityIdCriterion: EntityIdCriterion 
[id=https://shib.oit.duke.edu/shibboleth-idp]> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.saml.security.impl.MetadataCredentialResolver] - <Retrieving 
role descriptor metadata for entity 
'https://xxxx.xxx.xxx.xxx/shibboleth-idp' in role 
'{urn:oasis:names:tc:SAML:2.0:metadata}IDPSSODescriptor' for protocol 
'urn:oasis:names:tc:SAML:2.0:protocol'> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.saml.security.impl.MetadataCredentialResolver] - <Resolving 
credentials from metadata using entityID: 
https://xxxx.xxx.xxx.xxx/shibboleth-idp, role: 
{urn:oasis:names:tc:SAML:2.0:metadata}IDPSSODescriptor, protocol: 
urn:oasis:names:tc:SAML:2.0:protocol, usage: SIGNING> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.pac4j.saml.sso.impl.SAML2AuthnResponseValidator] - <Validating 
signature via trust engine for entity id 
https://xxxx.xxx.xxx.xxx/shibboleth-idp> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.saml.security.impl.SAMLSignatureProfileValidator] - <Saw 
Exclusive C14N signature transform> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,334 DEBUG 
[org.opensaml.saml.security.impl.SAMLSignatureProfileValidator] - <Saw 
Enveloped signature transform> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,333 DEBUG 
[org.pac4j.saml.sso.impl.SAML2AuthnResponseValidator] - <Validating profile 
signature for entity id https://xxxx.xxx.xxxx.xxx/shibboleth-idp> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,333 DEBUG 
[org.opensaml.storage.ReplayCache] - <Value 
'_c2f60f96fecc11e9809339258596ad16' was not a replay, adding to cache with 
expiration time 2023-03-30T20:06:25.331Z> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,333 DEBUG 
[org.opensaml.storage.AbstractMapBackedStorageService] - <Read failed, key 
'_c2f60f96fecc11e9809339258596ad16' not found in context 
'org.opensaml.saml.common.binding.security.impl.MessageReplaySecurityHandler'> 
[m 
63ff8111b2f8  [36m2023-03-30 20:01:28,333 DEBUG 
[org.opensaml.saml.common.binding.security.impl.MessageReplaySecurityHandler] 
- <Message Handler:  Evaluating message replay for message ID 
'_c2f60f96fecc11e9809339258596ad16', issue instant 
'2023-03-30T20:01:25.331Z', entityID 
'https://xxxx.xxx.xxxx.xxx/shibboleth-idp'> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,333 DEBUG 
[org.opensaml.messaging.handler.AbstractMessageHandler] - <Message 
Handler:  Activation condition for handler returned true> [m 
63ff8111b2f8  [36m2023-03-30 20:01:28,332 DEBUG 
[org.pac4j.saml.metadata.SAML2IdentityProviderMetadataResolver] - 
<lastModified: 1678473598041 / newLastModified: 1678473598041 -> 
hasChanged: false> [m 

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