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Nginx As imap4/pop3 Proxy Using Apache As Auth Server Backend

Aug 312012

It’s been a long times since i wrote my last article, i’ve been bussy with real life things.
As usual, I’ll get right to the subject of how to configure nginx as POP3/IMAP proxy server.

Nginx IP                 = 192.168.1.1
Postfix User Database IP = 192.168.1.5 (postfix + courier server + apache backend)

nginx server configuration

mail {
    server_name mail-proxy.example.com;
    # apache external backend
    auth_http  192.168.1.5:8081/auth.php;
    proxy  on;
    proxy_pass_error_message on;

    imap_capabilities "IMAP4rev1" "UIDPLUS" "IDLE" "LITERAL +" "QUOTA";

    pop3_auth plain apop cram-md5;
    pop3_capabilities "LAST" "TOP" "USER" "PIPELINING" "UIDL";

    ssl_certificate /etc/nginx/ssl_keys/db.mail-proxy.crt;
    ssl_certificate_key /etc/nginx/ssl_keys/db.mail-proxy.key;
    ssl_session_timeout 5m;
    ssl_protocols SSLv2 SSLv3 TLSv1;
    ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;
    ssl_prefer_server_ciphers on;

    server {
      listen      143;
      protocol    imap;
      starttls    on;
      auth_http_header X-Auth-Port 143;
      auth_http_header User-Agent "Nginx POP3/IMAP4 proxy";
    }

    server {
      protocol    pop3;
      listen      110;
      starttls    on;
      pop3_auth   plain;
      auth_http_header X-Auth-Port 110;
      auth_http_header User-Agent "Nginx POP3/IMAP4 proxy";
    }

    server {
      listen      993;
      ssl         on;
      protocol    imap;
      auth_http_header X-Auth-Port 993;
      auth_http_header User-Agent "Nginx POP3/IMAP4 proxy";
    }

    server {
      protocol    pop3;
      listen      995;
      ssl         on;
      pop3_auth   plain;
      auth_http_header X-Auth-Port 995;
      auth_http_header User-Agent "Nginx POP3/IMAP4 proxy";
    }
}

Create GeoIP Badge Using PHP Image Processing And GD

http, https, modules, php, plugin, programming 2 Responses »

Jul 052011

When making the badges I always use javascript. This tutorial shows you how to use the GD library to dynamically create simple badges on your site.

Basically, image generation is done in three steps:

allocating an image
drawing into the allocated space
releasing the allocated data in picture format to the browser

As usual, obtaining client Ip Address simply by calling this php predefined variable, this time we will also trying to support for IPv6. One drawback, i still don’t know how to resize canvas to be fit with text if overflown, dynamically. Ie: the long IPv6 address.

<?php echo $_SERVER["REMOTE_ADDR"]; ?>

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