Saml authentication is not working when encryption is enabled in IDP( Keycloak)

### problem

Saml authentication is not working when encryption is enabled in IDP( Keycloak)

### versions

ACS 4.22

### The steps to reproduce the bug

1. Configure Cloudstack for Saml authentication via Keycloak

Saml setting in cloudstack

```
saml2.enabled=true
saml2.default.idpid = http://app.example.com
saml2.check.signature= true
saml2.idp.metadata.url = http://192.168.55.150:8080/realms/kiranchavala/protocol/saml/descriptor
saml2.redirect.url= http://10.0.32.234:8080/client
saml2.sp.slo.url= http://10.0.32.234:8080/client
saml2.sp.sso.url= http://10.0.32.234:8080/client/api?command=samlSso
```

2. On keycloak side, enable encryption and Client signature required after importing the Cloudstack saml certificate xml file

3. On cloudstack login with SAML user

4. Exception occured

```
Failed to find admin configured username attribute in the SAML Response. Please ask your administrator to check SAML user attribute name.)
```
...

When encryption is enabled the saml response is

```

EHu+v85wSU+PpS3Dgpc9n2I9zE5BQ7G99aMXu39GS4NweASCuxn/O9XIOEc6Jzq4xj+oH39qFwBtz9qXQeL5X6saRAWy1d382QdENe+wdm+P4dX9cZ4pgUH98y/V+2beAttz0R+awnFd3sQb0tt5cuA1oSgfRlEHVZAQa6REC5F8MRV1uSXaJ6maOwgD7NjS8jXpDif2c1WRa2HZx91jNR0TwKoxZ2DD1NQeWahQ/FmFCLEvmAroEhVUbOZiyWdmQdPAboFXQbFFnPjN6ppftioH0tBL8yyg2pC61p95cvVJibcMsjdGk1vnUPJav0JW3zw7iCfslwwTT94IhRNo9YHDJu+Z0jzqRSp7qUdpk01EPmGytwrP40h6eOxDWPNQfnaQvFa41/SYsx1mk/3Rd2N/v8QpySQWXZRJpgg7Jh2dJtQ1gDK4+uYo7IT5W69DYAbkz7cSqs81OJ4G/riqEl5of4+8JIT/6wcsx6Ue9q9YTYMMT4mjIFg3bKXb9PpWo22lnTajifZA7rNsEM/V7XLSG72WaEmJIVZrhGT/2n8kAp3zv9kWuwub+zjtOZ7UfmQ+HBOGt7CgWHqcZN8vx7znmGoCXq8Z5zBAlGH5Z1K80qWuZOkgoISPC3+JI5ksSyMQq7J9a27Fsl4rnKzbkXvlWB7dt+McBwu0rkXQZYU=




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

```

Saml response when Encryption is disabled

```

http://192.168.55.150:8080/realms/kiranchavala

```

If the encryption is disabled on the keycloak side then the login is successful.

Related issues and discussion

https://github.com/apache/cloudstack/discussions/12788
https://github.com/apache/cloudstack/issues/4519
https://kiranchavala.in/blog/cloudstack-integration-with-keycloak/

### What to do about it?

CloudStack should support (Keycloak) IDP encryption,

Currently Cloudstack is not able to decrypt the payload from Keycloak in the saml response

Ideally, this should be the authentication flow

CloudStack → sends AuthnRequest
↓
Keycloak authenticates user
↓
Keycloak encrypts assertion
using CloudStack SP certificate
↓
Browser sends SAMLResponse
↓
CloudStack decrypts using
private key from keystore table

Cloudstack stores the certficate and keypair in the database

```
mysql> select * from keystore \G;
*************************** 1. row ***************************
id: 1
name: SAMLSP_KEYPAIR
certificate: 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
key: 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
domain_suffix: samlsp-keypair
seq: NULL
*************************** 2. row ***************************
id: 2
name: SAMLSP_X509CERT
certificate: 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
key:
domain_suffix: samlsp-x509cert
seq: NULL
2 rows in set (0.00 sec)

```

Comienza rastreando el manejo del inicio de sesión SAML de CloudStack desde la AuthnRequest configurada hasta la SAMLResponse cifrada y, después, inspecciona cómo se carga la entrada SAMLSP_KEYPAIR en la tabla keystore. Reproduce el problema con el cifrado de Keycloak habilitado y verifica que la respuesta se descifra y que el inicio de sesión se realiza correctamente sin el error de username-attribute.

Escrito por el modelo de indexación a partir del texto del issue.