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TCP proxy that inspects the TLS handshake for server name extension then proxies the request

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SNI Proxy

Proxies incoming HTTP and TLS connections based on the hostname contained in the initial request. This enables HTTPS name-based virtual hosting to separate backend servers without installing the private key on the proxy machine.

Features

  • Name-based proxying of HTTPS without decrypting traffic. No keys or certificates required.
  • Supports both TLS and HTTP protocols.
  • Supports IPv4, IPv6 and Unix domain sockets for both back end servers and listeners.
  • Supports multiple listening sockets per instance.

Usage

Usage: sniproxy [-c <config>] [-f]
    -c  configuration file, defaults to /etc/sniproxy.conf
    -f  run in foreground, do not drop privileges

Installation

For Debian or Fedora based Linux distributions see building packages below.

Prerequisites

  • Autotools (autoconf, automake and libtool)
  • libev4 and libpcre development headers
  • Perl and cURL for test suite

Install

./autogen.sh && ./configure && make check && sudo make install

Building Debian/Ubuntu package

This is the preferred installation method on recent Debian based distributions:

  1. Install required packages

    sudo apt-get install dpkg-dev cdbs debhelper dh-autoreconf libev-dev libpcre3-dev

  2. Build a Debian package

    dpkg-buildpackage

  3. Install the resulting package

    sudo dpkg -i ../sniproxy__.deb

Note on Upgrading

The version of sniproxy is not automatically updated after each commit, so if you are upgrading to a later version, the version number of the sniproxy package may not have actually changed. This may cause issues with the upgrade process. It is recommended you uninstall sudo apt-get remove sniproxy then reinstall the new version.

Building Fedora/RedHat package

This is the preferred installation method for modern Fedora based distributions.

  1. Install required packages

    sudo yum install rpmbuild autoconf automake curl libev-devel pcre-devel perl

  2. First build a distribution tarball:

    ./autogen && ./configure && make dist

  3. Build a RPM package

    rpmbuild --define "_sourcedir pwd" -ba redhat/sniproxy.spec

  4. Install resulting RPM

    sudo yum install ../sniproxy-..rpm

I've used Scientific Linux 6 a fair amount, but I prefer Debian based distributions. I do not test building RPMs frequently (SL6 doesn't have a libev-devel package). This build process may not follow the current Fedora packaging standards, and may not even work.

Configuration Syntax

user daemon

pidfile /tmp/sniproxy.pid

listener 127.0.0.1:443 {
    protocol tls
    table TableName
}

table TableName {
    # Match exact request hostnames
    example.com 192.0.2.10:4343
    example.net [2001:DB8::1:10]:443
    # Or use regular expression to match
    .*\\.com    [2001:DB8::1:11]:443
    # Combining regular expression and wildcard will resolve the hostname
    # client requested and proxy to it
    .*\\.edu    *:443
}

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