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#!/bin/bash
set -e
IFS=/ read n pid uid <<< "$1"
[ "$pid" ]
authtype=
while read -d ''
do
case "${REPLY%%=*}" in
'SSH_USER_AUTH' ) read authtype keytype keyvalue < "${REPLY#*=}" ;;
esac
done < /proc/$pid/environ
[ "$authtype" = publickey ]
keyhash=
while read
do
set -- $REPLY
if [ "$3 $5" = 'SSHFP 2' ]
then
keyhash=$6
break
fi
done < <(ssh-keygen -f <(printf '%s\n' "$keytype $keyvalue") -r .)
[ "$keyhash" ]
printf '%s\n' "$keyhash"
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