How should SSH access be handled in a hardened PSMP environment?

In a hardened Privileged Session Management Proxy (PSMP) environment, it is essential to maintain strict security protocols for managing SSH access to mitigate threats and vulnerabilities. Allowing incoming connections specifically on TCP port 22 is a standard practice aligned with the requirement for secure access.

Port 22 is the default port for SSH, and while using non-default ports can sometimes obscure services, it is not a substitute for strong security measures. When TCP port 22 is used in a controlled and monitored manner with appropriate firewalls and access controls, it can facilitate secure communications while ensuring that the environment remains hardened against unauthorized access.

In a hardened PSMP, the emphasis should be on establishing robust authentication methods, utilizing key-based authentication, implementing session monitoring, and enforcing strict access controls. By permitting connections on TCP port 22 under carefully managed conditions, organizations ensure that they maintain a balance between accessibility for legitimate users and overall security posture.

This practice allows for centralized logging and auditing of SSH sessions, which is critical in environments handling sensitive information. Therefore, maintaining the default port for SSH in a controlled environment, rather than misconfiguring or over-restricting access, is a key aspect of managing SSH in a hardened PSMP setup.