Поиск в Portage:

net-misc/scponly

A tiny pseudoshell which only permits scp and sftp

Скрины

USE флаги

+sftp
Глобально:
scp
Глобально: Add service type hints derived from username prefix
Приложения: Enables scp compatibility with potential security risks
winscp
Глобально: Enables WinSCP 2.0 compatibility with potential security risks
Приложения: Enables WinSCP 2.0 compatibility with potential security risks
gftp
Глобально: Enables gFTP compatibility
Приложения: Enables gFTP compatibility
rsync
Глобально: Enables rsync compatibility with potential security risks
Приложения: Enables rsync compatibility with potential security risks
unison
Глобально: Enables Unison compatibility with potential security risks
Приложения: Enables Unison compatibility with potential security risks
subversion
Глобально: Enable subversion (version control system) support
Приложения: Enables Subversion compatibility with potential security risks
wildcards
Глобально: Enables wildcard processing with potential security risks
Приложения: Enables wildcard processing with potential security risks
quota
Глобально: Add support for user quota on various filesystems
Приложения: Enables quota compatibility
passwd
Глобально: Enable /etc/passwd authentication
Приложения: Enables passwd compatibility
logging
* Этот флаг не документирован *