vmod_proxy - Varnish Module to extract TLV attributes from PROXYv2

          Copyright (c) 2018 GANDI SAS
          All rights reserved.

          Author: Emmanuel Hocdet <manu@gandi.net>

          SPDX-License-Identifier: BSD-2-Clause

          Redistribution and use in source and binary forms, with or without
          modification, are permitted provided that the following conditions
          are met:
          1. Redistributions of source code must retain the above copyright
             notice, this list of conditions and the following disclaimer.
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             notice, this list of conditions and the following disclaimer in the
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          ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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                                                                                                   VMOD_PROXY(3)

vmod_proxy contains functions to extract proxy-protocol-v2 TLV attributes as described in
        <https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt> .

   STRINGalpn()
       Extract ALPN attribute.

       Example:

          set req.http.alpn = proxy.alpn();

       Restricted to: client.

   STRINGauthority()
       Extract authority attribute. This corresponds to SNI from a TLS connection.

       Example:

          set req.http.authority = proxy.authority();

       Restricted to: client.

   BOOLis_ssl()
       Report if proxy-protocol-v2 has SSL TLV.

       Example:

          if (proxy.is_ssl()) {
                  set req.http.ssl-version = proxy.ssl_version();
          }

       Restricted to: client.

   BOOLclient_has_cert_sess()
       Report  if  the  client provided a certificate at least once over the TLS session this connection belongs
       to.

       Restricted to: client.

   BOOLclient_has_cert_conn()
       Report if the client provided a certificate over the current connection.

       Restricted to: client.

   INTssl_verify_result()
       Report the SSL_get_verify_result from a TLS session. It only matters if client_has_cert_sess()  is  true.
       Per default, value is set to 0 (X509_V_OK).

       Example:

          if (proxy.client_has_cert_sess() && proxy.ssl_verify_result() == 0) {
                  set req.http.ssl-verify = "ok";
          }

       Restricted to: client.

   STRINGssl_version()
       Extract SSL version attribute.

       Example:

          set req.http.ssl-version = proxy.ssl_version();

       Restricted to: client.

   STRINGclient_cert_cn()
       Extract the common name attribute of the client certificate's.

       Example::
              set req.http.cert-cn = proxy.client_cert_cn();

       Restricted to: client.

   STRINGssl_cipher()
       Extract the SSL cipher attribute.

       Example:

          set req.http.ssl-cipher = proxy.ssl_cipher();

       Restricted to: client.

   STRINGcert_sign()
       Extract the certificate signature algorithm attribute.

       Example:

          set req.http.cert-sign = proxy.cert_sign();

       Restricted to: client.

   STRINGcert_key()
       Extract the certificate key algorithm attribute.

       Example:

          set req.http.cert-key = proxy.cert_key();

       Restricted to: client.

       vmod_proxy - Varnish Module to extract TLV attributes from PROXYv2

       • varnishd(1)

       • vsl(7)

          import proxy [as name] [from "path"]

          STRING alpn()

          STRING authority()

          BOOL is_ssl()

          BOOL client_has_cert_sess()

          BOOL client_has_cert_conn()

          INT ssl_verify_result()

          STRING ssl_version()

          STRING client_cert_cn()

          STRING ssl_cipher()

          STRING cert_sign()

          STRING cert_key()