I had a chat with a colleague today regarding FTP access. For some reason, it made me think of the /etc/shells file. This file allows an FTP user access to the system if his/her shell is defined in it. An example is shown below.
By the way, this is a user created file.
#cat > /etc/shells
/sbin/sh
/bin/sh
/bin/csh
/bin/ksh
/bin/bash
/bin/tcsh
control ^d
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