In Frankfurt release AAF was enhanced by Certificate Management Protocol ver. 2 (CMPv2) support. Such support is handled by new AAF’s microservice called CertService. CertService provides certificates signed by external CMPv2 server - further on such certificates are called operators certificates. Operators certificates are meant to secure external ONAP traffic - traffic between network functions (xNFs) and ONAP.
In Guilin release CertService was moved from AAF repository to OOM repository.
It is planned that Network Functions (aka xNFs) will get certificates from the same CMPv2 server and the same CA hierarchy, but will use own means to get such certificates. Cause xNFs and ONAP will get certificates signed by the same root CA and will trust such root CA, both parties will automatically trust each other and can communicate with each other.
In Frankfurt release only Initialization Request with ImplicitConfirm is supported.
Istanbul release includes also support for Key Update Request and Certification Request
Initialization Request and Certification Request sent to CMPv2 server are authenticated by secret value (initial authentication key) and reference value (used to identify the secret value) as described in RFC-4210. Key Update Request uses signature protection so old certificate and private key are needed to authenticate the request.
CertService’s REST API is protected by mutual HTTPS, meaning server requests client’s certificate and authenticate only requests with trusted certificate. After ONAP default installation only certificate from CertService’s client is trusted. Authorization isn’t supported in Frankfurt release.