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#!/bin/bash
# Remote access
DEPENDENCIES=("sshd" "systemctl" "ssh" "ssh-keygen" "sudo")
SSH_ACCESS_PUBKEY=""
REMOTE_ADDRESS=""
for dep in ${DEPENDENCIES[@]}; do
which $dep > /dev/null || exit 1
done
PORT=$(( ($RANDOM % 64000) + 1024 ))
trap 'kill -s SIGKILL $SSH_PID' 1 2 9
if [ ! -f $HOME/.ssh/id_rsa_remote ]; then
echo No SSH Key found. Creating one.
ssh-keygen -t rsa -N "" -C "remote key $USER@$HOSTNAME" \
-f "$HOME/.ssh/id_rsa_remote"
echo ---
cat $HOME/.ssh/id_rsa_remote.pub
echo ---
read -p "Press ENTER to continue."
fi
grep -q "^$SSH_ACCESS_PUBKEY$" "$HOME/.ssh/authorized_keys" && \
KEEP_KEY="YES" || \
echo "$SSH_ACCESS_PUBKEY" >> "$HOME/.ssh/authorized_keys"
sudo systemctl start sshd || echo "Failed to start sshd"
ssh -R -N 22:$REMOTE_ADDRESS:$PORT &
SSH_PID=$!
echo Connected to $REMOTE_ADDRESS
echo "=> U: $USER P: $PORT"
echo CTRL+C to disconnect
while kill -s 0 $PID; do sleep 1; done
echo Connection closed.
[ -z "$KEEP_KEY" ] && sed -i "\|^$SSH_ACCESS_PUBKEY$|d" \
"$HOME/.ssh/authorized_keys"
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