将 NET::SMTP SSL/TLS 与 SOCKS 一起使用 [英] use NET::SMTP SSL/TLS with SOCKS

问题描述

我有一些bind的实现，连接SOCKS，通过SOCKS连接SMTP服务器.我如何使用 SSL/TLS NET::SMTP 连接?这个问题对我没有帮助，因为无法启动 SSL 握手.

I have some realization of bind, connect to SOCKS and connect to SMTP server through SOCKS. How i can use this connect with SSL/TLS NET::SMTP? This question not help me, because SSL handshake can't start.

DEBUG: .../IO/Socket/SSL.pm:683: waiting for fd to become ready: SSL wants a read first
DEBUG: .../IO/Socket/SSL.pm:693: handshake failed because socket did not became ready

这里实现通过代理连接远程服务器:

Here realization of connect to remote server via proxy:

sub connect {
    my ($ip, $port, $is_ssl, $pid, $server) = @_;
    if (defined $socket) {
        my ($packed_cmd, $buffer, @data, %response);
        $packed_cmd = pack("C4Nn", 0x05, 0x01, 0x00, 0x01, $ip, $port);
        $socket->send($packed_cmd);
        if (defined $socket->recv($buffer, 1024)) {
            @data = unpack("C4 L S", $buffer);
            $response{'version'} = $data[0];
            $response{'result'} = $data[1];
            $response{'reg'} = $data[2];
            $response{'type'} = $data[3];
            $response{'ip'} = $data[4];
            $response{'port'} = $data[5];
            $socket->blocking(0);
            if ($is_ssl) {
                &debug(3, $pid, "Try start SSL handshake with [$server]\n");
                IO::Socket::SSL->start_SSL($socket, SSL_version => 'SSLv23', SSL_ca_file => SSL_CA_FILE) or &debug(3, $pid, "Cannot start SSL handshake! $@\n") and return 0; 
                &debug(3, $pid, "SSL handshake done!\n");
            }
            # TODO: Make TLS support
            return 1;
        }
    }
    &debug(3, $pid, "Cannot connect to [$server:$port] through socks server [$socks_name:$socks_server]\n");
    return 0;
}

绑定袜子

sub bind_socks {
    my ($pid) = @_;
    my ($method, $packed_cmd, $buffer, @data, %response);
    $socket = IO::Socket::INET->new(
        PeerAddr => $socks_server,
        PeerPort => $socks_port,
        Proto => 'tcp',
        Timeout  => SOCKS5_CONNECT_TIMEOUT
    ) or &debug(3, $pid, "Cannot connect to the socks server [$socks_server] $@\n") and return 0;
    &debug(3, $pid, "Connected to the socks server [$socks_name:$socks_server]\n");
    $socket->blocking(1);
    if ($socks_username && $socks_password) {
        $method = 0x02;
    } else {
        $method = 0x00;
    }
    $packed_cmd = pack("C3", 0x05, 0x01, $method);
    $socket->send($packed_cmd);
    if (defined $socket->recv($buffer, 1024)) {
        @data = unpack("C2", $buffer);
        $response{'version'} = $data[0];
        $response{'method'} = $data[1];
        if ((defined $response{'version'}) && (defined $response{'method'}) && ($response{'version'} eq 5) && ($response{'method'} eq $method)) {
            if ($method == 2) {
                $packed_cmd = pack("CC", 0x01, length($socks_username)) . $socks_username . pack("C", length($socks_password)) . $socks_password;
                $socket->send($packed_cmd);
                if (defined $socket->recv($buffer, 1024)) {
                    @data = unpack("C2", $buffer);
                    $response{'version'} = $data[0];
                    $response{'status'} = $data[1];
                    return 1;
                }
            } else {
                return 1;
            }
        } else {
            &debug(3, $pid, "Cannot authenticate on socks server [$socks_name:$socks_server]\n");
            return 0;
        }
    }
    &debug(3, $pid, "Cannot authenticate on socks server [$socks_name:$socks_server]\n");
    return 0;
}

推荐答案

这里 是我通过socks 代理使用SMTP 的测试版代码.SSL 在我测试过的所有服务器上都可以正常工作.使用 TLS 仍然有时会出现问题，可能是不符合 RFC 的问题.

Here is my beta code to use SMTP via socks proxy. SSL is working correctly with all servers tested by me. With TLS still have sometimes problems, probably something not according to the RFC.

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