nginx-http-radius authentication module

http authentication by radius protocol.

@author qudreams

Note:

The nginx-http-radius module depend on libmyradclient,so you must compile the library firstly;
libmyradclient.a must be in same directory with nginx-http-radius module,because the nginx-http-radius module
set the environment variables CORE_INCS and CORE_LIBS in 'config' file depending this.
The module also just support the following authentication methods:
    PAP,CHAP,MSCHAP,MSCHAPV2,EAPMD5

Usage:

1. compile the libmyradclient firstly.
2. compile the module into nginx like this:
    ./configure --add-module=src/nginx-http-radius-module
    make

    after compiling,install it by the following directive:
        make install

    Nginx will be installed into the directory /usr/local/nginx acquiescently.
3. install nginx,and then modify the configuration file nginx.conf.
    the configuration file may be like the following:

    http {
        #set the directory of radius dictionary.
        radius_dict_directory "/usr/local/nginx/raddb/";

        #radius server configuration including

        radius_server "radius_server1" {
            #authentication timed-out
            auth_timeout 5;

            #limit to resend the request
            resend_limit 3;

            #radius authentication server url.
            url "127.0.0.1:1812";

            #share secret
            share_secret "secret";
        }

        server {
            listen       80;
            server_name  localhost;

            #charset koi8-r;

            #access_log  logs/host.access.log  main;

            location = /{
                root   html;
                index  index.html index.htm;

                #radius server configuration

                #the third paramter is authentication method,you can set the following value:
                # PAP CHAP MSCHAP MSCHAP2 EAPMD5

                auth_radius_server "radius_server1" "PAP";

                #authentication realm,you can set the following value:
                # Restricted "Close Content" off

                auth_radius "Restricted";
            }
        }
    }