virgil-nginx-noise-socket

Nginx module that implements Noise Socket Protocol by using Virgil Security infrastructure.

Features

Own context in the Nginx server providing a functionality of TCP of a proxy.
Protection of traffic by means of Noise Protocol.
At the moment only Noise_XX_25519_AESGCM_BLAKE2b noise protocol pattern is implemented.

Building of Nginx with the virgil-nginx-noise-socket module:

list of dependences

Autoconf
Automake
pcre
pcre-devel
pcre2
pcre2-devel
openssl-devel
flex
bison

Building

The virgil-nginx-noise-socket module is tested with nginx-1.12.1.
Module is tested in an OS Linux Mint 17.1 Rebecca 64-bit, Linux Mint 18.1 Serena 64-bit, Centos 7.
Set Noise-C library is necessary for building of the server.

How to build Noise-C it is described in Noise-C Documentation.
Installation of library Noise-C in system:
```
  $ make install
```
For option of use as a crypto backend of libsodium:
To take stable release of libsodium and to build it:
```
 $ git clone https://github.com/jedisct1/libsodium.git -b stable
 $ ./configure
 $ make && make check
 $ sudo make install
```
- To build the ´Noise-C´ library with option:
```
$ autoreconf -i
$ ./configure --with-openssl --with-libsodium
$ make
$ make check
```
- Make sure that the list of the required libraries contains libsodium in the virgil-nginx-noise-socket/config file (a line 37, ngx_module_libs=”… - lsodium”
1. Source code of the nginx server can be taken form nginx.org. You must download and unpack source code of server in home directory
```
$ mkdir ~/workspace
$ tar -xvf path/to/nginx-1.12.1.tar.gz -C ~/workspace
```
2. To clone repository of virgil-nginx-noise-socket module into ~/workspace/nginx-1.12.1/virgil-nginx-noise-socket
```
$ git clone https://github.com/VirgilSecurity/virgil-nginx-noise-socket ~/workspace/nginx-1.12.1/virgil-nginx-noise-socket
```
3. The example of a script for build of the nginx server with the module is located in virgil-nginx-noise-socket/example/nginx_configure.sh. You must copy this script to root directory of source code of nginx and run this
```
$ cp ~/workspace/nginx-1.12.1/virgil-nginx-noise-socket/example/nginx_configure.sh ~/workspace/nginx-1.12.1/
$ sudo ~/workspace/nginx-1.12.1/nginx_configure.sh
```
4. The example of a test configuration of the server is located in virgil-nginx-noise-socket/example/nginx.conf. The configuration realizes a functionality of reverse proxy and a backend server working in one copy of nginx launched by the local machine. The configuration works as follows:

https://localhost/	->	internal redirect to `noise_socket` context	->	proxy to backend over noise socket	—->
—->	`noise_socket` context on the backend server	->	internal redirect to http context	->	access to the static page index.html “Welcome to nginx!”

For operation of the Noise Protocol files of private keys are necessary for noise initiator(client) and noise responder (server). Keys are generated by means of the test utility of echo-keygen from libraryNoise-C (noise-c/examples/echo/echo-keygen). Use of the utility is described in noise-c example echo. Examples of files of the generated keys virgil-nginx-noise-socket/example/server_key_25519 and virgil-nginx-noise-socket/example/client_key_25519.
It is necessary for start of a test configuration:

To copy files of the generated keys from the folder virgil-nginx-noise-socket/example/ into /etc/noise directory
To copy file nginx.conf from the folder virgil-nginx-noise-socket/example/ into /etc/nginx directory

To create self-signed ssl sertificate

  $ sudo openssl genrsa -out /etc/ssl/nginx-selfsigned.key 2048
  $ sudo openssl req -x509 -new -key /etc/ssl/nginx-selfsigned.key -days 10000 -out /etc/ssl/nginx-selfsigned.crt

To run nginx server

  $ sudo ~/workspace/nginx-1.12.1/objs/nginx

For testing open the browser and write https://localhost. You shall to see “Welcome to nginx!”

For nginx stop

  $ sudo ~/workspace/nginx-1.12.1/objs/nginx -s stop

Basic directives

Syntax:     noise_socket { ... }
Default:     —
Context:     main

Provides the configuration file context in which the noise socket server directives are specified.

Syntax:     server { ... } 
Default:     — 
Context:     noise_socket

Sets the configuration for a server.

Syntax:     listen address:port [noise] [udp] [backlog=number] [ipv6only=on|off] [reuseport] [so_keepalive=on|off|[keepidle]:[keepintvl]:[keepcnt]];
Default:     —
Context:     server

The [noise] parameter allows specifying that all connections accepted on this port should work in noise socket mode. Defines that this socket is used as noise responder (server). Remaining parameters are similar to the parameters described for the directive of listen of the ngx_stream_core_module module.

Syntax:     preread_buffer_size size;
Default:     preread_buffer_size 65517;
Context:     noise_socket, server

Specifies a size of the preread buffer for server.

Syntax:     server_private_key_file file;
Default:     —
Context:     noise_socket, server

Specifies a file with the secret key in the format of the simple sequence of bytes for the given noise responder (server).

Syntax:     client_private_key_file file;
Default:     —
Context:     noise_socket, server

Specifies a file with the secret key in the format of the simple sequence of bytes for the given noise initiator(client).

Syntax:     proxy_noise on | off;
Default:     proxy_noise off;
Context:     noise_socket, server

Enables the noise socket protocol for connections to a proxied server.

Syntax:     block_buffer_size size;
Default:     block_buffer_size 65517;
Context:     noise_socket, server

Sets the size of the buffer used for reading data from the proxied server. Also sets the size of the buffer used for reading data from the client. Value by default is the maximum size of the payload determined in the specification The Noise Protocol Framework. This parameter determines the buffer size for noise initiator(client) and noise responder (server).

Syntax:     noise_handshake_timeout time;
Default:     noise_handshake_timeout 60s;
Context:     noise_socket, server

Specifies a timeout for the Noise Protocol handshake to complete.

The module supports also following directives:

proxy_pass, proxy_bind, proxy_connect_timeout, proxy_timeout, proxy_upload_rate, proxy_download_rate, proxy_responses, proxy_next_upstream, proxy_next_upstream_tries, proxy_next_upstream_timeout.

The description of directives same, as for the ngx_stream_proxy_module module only in noise_socket context.

resolver, resolver_timeout, preread_timeout, tcp_nodelay

The description of directives same, as for the ngx_stream_core_module module only in noise_socket context.

Keepalive connection configuring

For setup of saving a noise socket session it is possible to use the following directives of nginx for frontend server http:

http {
    ...
    proxy_http_version 1.1;
    keepalive_requests 10;
    keepalive_timeout 50s;
    ...
    server {
      ...
      location {
          ...
          proxy_set_header Connection keep-alive;
        ...
      }
    }
    ustream name {
        ....
        keepalive 1;
        ....
    }
}

Directives are designated by comments “###For the noise socket connection keepalive setup…###” in the file of a test configuration virgil-nginx-noise-socket/example/nginx.conf