Identity Manager: Certificate Import Failure with LDAP Error 21 Invalid Attribute Syntax

Products

• CA Identity Manager
• CA Identity Suite

Issue/Introduction

When attempting to import a certificate into Identity Manager, the operation fails. The User Console or logs report a specific LDAP syntax error, preventing the certificate from being recognized or stored correctly in the object store.

Verbatim Error Message: Invalid Attribute Syntax - LDAP Error 21

Environment

Identity manger 14.x

Cause

The error is typically caused by a malformed or improperly formatted certificate file. LDAP Error 21 signifies that the value provided does not adhere to the syntax defined for that attribute (in this case, the certificate attribute). Common reasons include:

• Extra spaces or hidden characters in the certificate file.
• Incorrect encoding (e.g., using a format other than Base64-encoded X.509).
• Incomplete certificate chains.

Resolution

Ensure the certificate is in a valid format and passes standard validation checks before attempting the import.

1. Validate with OpenSSL: Run the following command to verify the certificate file integrity:

   openssl x509 -in [certificate_file] -text -noout

   • If this command returns an error (e.g., "unable to load certificate"), the file is corrupt or improperly formatted.
2. Verify Encoding:
   • Confirm the certificate is Base64-encoded (PEM format).
   • Open the file in a plain text editor (like Notepad++ or vi) and ensure there are no leading/trailing spaces outside the -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- markers.
3. Check Attribute Mapping: Ensure the Identity Manager directory configuration maps the certificate to an attribute that supports binary or large string data, consistent with the user store's LDAP schema.
4. Re-export Certificate: If the file fails validation, re-export the certificate from the source, ensuring you select the Base-64 encoded X.509 (.CER) format.