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Captive portal CGI
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| #!/bin/sh | |
| cat << EOF | |
| Status: 302 Temporary Redirect | |
| Location: /cgi-bin/auth | |
| Cache-Control: no-cache | |
| <!doctype html> | |
| <html> | |
| <head> | |
| <meta http-equiv="refresh" content="0; /cgi-bin/auth" /> | |
| </head> | |
| <body></body> | |
| </html> | |
| EOF |
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| #!/bin/sh | |
| accept_client() { | |
| ip_striped=${REMOTE_ADDR//./\\.} | |
| mac=`cat /proc/net/arp | awk -e "/^$ip_striped / {print \\$4}"` | |
| iptables -t mangle -I internet -m mac --mac-source $mac -j RETURN | |
| } | |
| urldecode() { | |
| local url_encoded="${1//+/ }" | |
| printf '%b' "${url_encoded//\%/\\x}" | |
| } | |
| if [ "$REQUEST_METHOD" == "POST" ]; then | |
| read -n $CONTENT_LENGTH post_data | |
| while [ ! -z "$post_data" ]; do | |
| part=${post_data%%&*} | |
| key=${part%%=*} | |
| value=${part#$key=} | |
| post_data=${post_data#$part} | |
| post_data=${post_data#&} | |
| if [ "$key" == "answer" ] && [ "$value" == "sudo" ]; then | |
| accept_client | |
| accepted="true" | |
| fi | |
| if [ "$key" == "referer" ]; then | |
| referer="$(urldecode $value)" | |
| fi | |
| done | |
| if [ "$accepted" == "true" ]; then | |
| magic="document.querySelector('input').disabled = true;setTimeout(function() { location.href=\"${referer}\"; }, 3000);" | |
| fi | |
| fi | |
| referer=$(echo ${HTTP_REFERER} | sed -e 's/\\/\\\\/g' -e 's/"/\\"/g') | |
| cat << EOF | |
| Content-Type: text/html | |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="content-type" content="text/html; charset=utf-8" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1"/> | |
| <meta http-equiv="cache-control" content="no-cache" /> | |
| <meta http-equiv="expires" content="0" /> | |
| <meta http-equiv="pragma" content="no-cache" /> | |
| <style type="text/css"> | |
| html { | |
| background: black; | |
| color: white; | |
| text-align: center; | |
| font-size: 20pt; | |
| } | |
| </style> | |
| <title>Form</title> | |
| </head> | |
| <body> | |
| <img src="/q.png"> | |
| <form method="post"> | |
| <p> | |
| <input name="answer" /> make me a sandwich. | |
| </p> | |
| <input name="referer" type="hidden" value="${referer}" /> | |
| <button type="submit">Authenticate</button> | |
| </form> | |
| <script>$magic</script> | |
| </body> | |
| </html> | |
| EOF |
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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" /> | |
| </head> | |
| <body style="background-color: white"> | |
| <a style="color: black; font-family: arial, helvetica, sans-serif;" href="/cgi-bin/luci">LuCI - Lua Configuration Interface</a> | |
| <script> | |
| if (location.host !== 'openwrt.lan') { | |
| location.href='//openwrt.lan/cgi-bin/auth'; | |
| } else { | |
| location.href='/cgi-bin/luci'; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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| iptables -N internet -t mangle | |
| iptables -t mangle -A PREROUTING -j internet | |
| iptables -t mangle -A internet -i br-guest -j MARK --set-mark 99 | |
| iptables -t nat -A prerouting_rule -m mark --mark 99 -p tcp --dport 80 -j DNAT --to 192.168.2.1 | |
| iptables -t filter -A forwarding_rule -m mark --mark 99 -j DROP |
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