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68 lines
1.6 KiB
Bash
68 lines
1.6 KiB
Bash
#!/bin/sh
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# This script will block all traffic to ports 80 and 443.
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#
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# If you want to allow some websites/IPs to still work
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# after adding the filters.
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#
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# Set the $ALLOWED_DEST variable to the network/mask you want to accept
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#
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#
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# Another option is to add specific rules to
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# iptables to allow it. For instance:
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#
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# sudo iptables --insert OUTPUT --protocol tcp --destination 138.4.0.0/16 --jump ACCEPT
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#
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# iptables rules are interpreted top to bottom.
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# --append adds rules to the end of the file
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# --insert adds rules to the top of the file
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# Hence, you can either append the rule before running
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# the script, or insert the rule so it takes precedence.
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ALLOWED_DEST=${ALLOWED_DEST:=138.4.0.0/16}
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export SUDO_ASKPASS=/usr/lib/ssh/ssh-askpass
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CMD="sudo -A iptables"
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RULE="OUTPUT --protocol tcp --jump DROP --dport"
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ALLOW_RULE="OUTPUT --protocol tcp --jump ACCEPT --destination $ALLOWED_DEST"
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stop_filter() {
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$CMD --delete $RULE 80
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$CMD --delete $RULE 443
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$CMD --delete $ALLOW_RULE
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}
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filter() {
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stop_filter >&2 /dev/null # Avoid re-adding
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$CMD --append $RULE 80
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$CMD --append $RULE 443
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$CMD --insert $ALLOW_RULE
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}
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help() {
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echo "Block all traffic to ports 80 and 443"
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echo ""
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echo "Usage: $0 on|off"
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echo ""
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echo "Set the ALLOWED_DEST variable to whitelist some IPs/network"
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echo "Currently whitelisted: $ALLOWED_DEST"
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}
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if [ "$#" -ne 1 ]; then
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filter
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else
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case "$1" in
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"on")
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filter
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;;
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"off")
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zenity --question --text="Are you sure you want to let distractions in?" && stop_filter
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;;
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*)
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help
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esac
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fi
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