curl -sSL https://www.sudo.ws/ftp/etc/passwd
root:*:0:0:Charlie &:/root:/bin/csh
daemon:*:1:31:The devil himself:/root:/sbin/nologin
operator:*:2:5:System &:/operator:/sbin/nologin
bin:*:3:7:Binaries Commands and Source,,,:/:/sbin/nologin
www:*:67:67:HTTP server:/var/www:/sbin/nologin
ftp:*:98:20:Anonymous FTP:/usr/home/ftp:/usr/bin/false
nobody:*:32767:32767:Unprivileged user:/nonexistent:/sbin/nologin
millert:*:8036:20:Todd C. Miller:/usr/home/millert:/usr/local/bin/tcsh

curl -sSL https://www.sudo.ws/ftp/etc/group
wheel:*:0:root
daemon:*:1:daemon
kmem:*:2:root
sys:*:3:root
tty:*:4:root
operator:*:5:root
bin:*:7:
news:*:8:
wsrc:*:9:
users:*:10:
games:*:13:
staff:*:20:root
guest:*:31:root
utmp:*:45:
www:*:67:
network:*:69:
named:*:70:
dialer:*:117:
nogroup:*:32766:
nobody:*:32767:

https://opensource.apple.com/source/sudo/sudo-5.1/sudo/

https://github.com/sudo-project/sudo/issues/215


millert commented
That's just a placeholder file inside a chroot jail for the ftp directory. It's only purpose is to map user IDs to names for ftp.sudo.ws. There is no sensitive information there and you don't have access to the filesystem outside the chroot jail.

millert commented
https://www.sudo.ws/ftp is just the web view of ftp://ftp.sudo.ws/.

https://github.com/sudo-project/sudo