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Name

lua-resty-sniproxy - SNI Proxy based on the ngx_lua cosocket API

Table of Contents

• Description
• Status
• Synopsis
• TODO
• Copyright and License
• See Also

Description

This library is an SNI proxy written in Lua. TLS parsing part is rewritten from dlundquist/sniproxy

Note that nginx stream module and ngx_stream_lua_module is required.

Tested on Openresty >= 1.9.15.1.

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Status

Experimental.

Synopsis

stream {
    init_by_lua_block {
        local sni = require("resty.sniproxy")
        sni.rules = { 
            {"www.google.com", "www.google.com", 443},
            {"www.facebook.com", "9.8.7.6", 443},
            {"api.twitter.com", "1.2.3.4"},
            {".+.twitter.com", nil, 443},
            -- to activate this rule, you must use Lua land proxying
            -- {"some.service.svc", "unix:/var/run/nginx-proxy-proto.sock", nil, sni.SNI_PROXY_PROTOCOL_UPSTREAM},
            -- {"some2.service.svc", "unix:/var/run/nginx-proxy-proto.sock", nil,
            --                            sni.SNI_PROXY_PROTOCOL_UPSTREAM + sni.SNI_PROXY_PROTOCOL},
            {".", "unix:/var/run/nginx-default.sock"}
        }   
    }

    # for OpenResty >= 1.13.6.1, native Nginx proxying
    lua_add_variable $sniproxy_upstream;
    server {
            error_log /var/log/nginx/sniproxy-error.log error;
            listen 443;

            resolver 8.8.8.8;

            preread_by_lua_block {
                    local sni = require("resty.sniproxy")
                    local sp = sni:new()
                    sp:preread_by()
            }
            proxy_pass $sniproxy_upstream;
    }

    # for OpenResty < 1.13.6.1 or `flags` are configured, Lua land proxying
    server {
            error_log /var/log/nginx/sniproxy-error.log error;
            listen 443;

            resolver 8.8.8.8;

            content_by_lua_block {
                    local sni = require("resty.sniproxy")
                    local sp = sni:new()
                    sp:content_by()
            }
    }
}

A Lua array table sni_rules should be defined in the init_worker_by_lua_block directive.

The first value can be either whole host name or regular expression. Use . for a default host name. If no entry is matched, connection will be closed.

The second and third values are target host name and port. A host can be DNS name, IP address or UNIX domain socket path. If host is not defined or set to nil, server_name in SNI will be used. If the port is not defined or set to nil , 443 will be used.

The forth value is the flags to use. Available flags are:

    sni.SNI_PROXY_PROTOCOL -- use client address received from proxy protocol to send to upstream
    sni.SNI_PROXY_PROTOCOL_UPSTREAM -- send proxy protocol v1 handshake to upstream

To use flags, the server must be configured to do Lua land proxying (see above example).

Rules are applied with the priority as its occurrence sequence in the table. In the example above, api.twitter.com will match the third rule api.twitter.com rather than the fourth .+.twitter.com.

If the protocol version is less than TLSv1 (eg. SSLv3, SSLv2), connection will be closed, since SNI extension is not supported in these versions.

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TODO

• stress and performance test

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Copyright and License

This module is licensed under the BSD license.

Copyright (C) 2016, by fffonion fffonion@gmail.com.

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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See Also

• the ngx_stream_lua_module: https://github.com/openresty/stream-lua-nginx-module
• [dlundquist/sniproxy] (https://github.com/dlundquist/sniproxy)
• [ngx_stream_ssl_preread_module] (https://nginx.org/en/docs/stream/ngx_stream_ssl_preread_module.html) is available since Nginx 1.11.5 as an alternative to this module.

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