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zwerfkat / mod-auth-token

Automatically exported from code.google.com/p/mod-auth-token
Apache License 2.0
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This module uses token based authentication to secure downloads and prevent deep-linking.

Have your script or servlet generate a token to authenticate the download and let Apache handle the file transfer without having to pipe it through a script for security.

You can find downloads, daily snapshots and support information at http://code.google.com/p/mod-auth-token/

USAGE

The token is an hex-encoded MD5 hash of the secret password, relative file path and the timestamp. It is encoded onto the URI as:

<uri-prefix><token>/<timestamp-in-hex><rel-path>

For example

/protected/dee0ed6174a894113d5e8f6c98f0e92b/43eaf9c5/path/to/file.txt

where the token is generated as 

md5("secret" + "/path/to/file.txt" + dechex(time_now()))

you can add in the md5 hash the ip (and not the hostname) of the client to limit by ip. If you do so, enable AuthTokenLimitByIp in the config file of apache

with the following configuration in httpd.conf

<Location /protected/>
  AuthTokenSecret       "secret"
  AuthTokenPrefix       /protected/
  AuthTokenTimeout      60
    AuthTokenLimitByIp    off
</Location

The actual file would be located in

/protected/path/to/file.txt

CREDITS

Implementation ideas were taken from mod_secdownload for LIGHTTPD