Diskussion:Ssh knock: Unterschied zwischen den Versionen
Aus UUGRN
(Simple knock.) |
(pre/pre) |
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| Zeile 1: | Zeile 1: | ||
What do you think of this script? (A thousand apologies, not a German-speaker.) | What do you think of this script? (A thousand apologies, not a German-speaker.) | ||
| + | <pre> | ||
#!/bin/sh | #!/bin/sh | ||
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echo '/*/' | echo '/*/' | ||
| + | </pre> | ||
Aktuelle Version vom 15. Mai 2014, 18:38 Uhr
What do you think of this script? (A thousand apologies, not a German-speaker.)
#!/bin/sh
dir=/var/knockdata
num=${0##*[.]}
function badknock { echo b > "$dir/$1"; } # hosts banned until lockfile removed
function ifnoknock { if [[ ! -f "$dir/$1" ]]; then badknock $REMOTE_HOST; fi }
case "$num" in
1) if [[ -f "$dir/$REMOTE_HOST" ]] #reknock?
then if [[ "$(<$dir/$REMOTE_HOST)" = 'g' ]]
then echo 1 > "$dir/$REMOTE_HOST" #reknock!
else badknock "$REMOTE_HOST"
fi
else echo 1 > "$dir/$REMOTE_HOST"
fi ;;
2) ifnoknock "$REMOTE_HOST"
if [[ "$(<$dir/$REMOTE_HOST)" = '1' ]]
then echo 2 > "$dir/$REMOTE_HOST"
else badknock "$REMOTE_HOST"
fi ;;
3) ifnoknock "$REMOTE_HOST"
if [[ "$(<$dir/$REMOTE_HOST)" = '2' ]]
then echo g > "$dir/$REMOTE_HOST"
else badknock "$REMOTE_HOST"
fi ;;
t) ifnoknock "$REMOTE_HOST"
if [[ "$(<$dir/$REMOTE_HOST)" = 'g' ]]
then exec /usr/sbin/sshd -i # (https://wiki.uugrn.org/Ssh_knock)
fi ;;
esac
echo '/*/'
