Alexey Leonchik

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====== Skype Access Controls ======

Warning: Any example presented here is provided "as-is" with no support or guarantee of suitability. If you have any further questions about these examples please email the squid-users mailing list.

Squid Configuration File

Configuration file to Include:

Since FTP uses numeric IPs the Skype ACL must be exact including the port. 

===== Blocking =====

  # Skype
  
  acl numeric_IPs dstdom_regex ^(([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)|(\[([0-9af]+)?:([0-9af:]+)?:([0-9af]+)?\])):443
  acl Skype_UA browser ^skype^
  
  http_access deny numeric_IPS
  http_access deny Skype_UA

Recent releases of Skype have been evading the above restriction by not sending their User-Agent headers and using domain names. The following can be used to catch those installs, but be aware it will likely also catch other agents. 

  acl validUserAgent browser \S+
  http_access deny !validUserAgent

===== Permitting =====

This needs to be done before any restrictive CONNECT http_access controls. 

  acl numeric_IPs dstdom_regex ^(([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)|(\[([0-9af]+)?:([0-9af:]+)?:([0-9af]+)?\])):443
  acl Skype_UA browser ^skype^
  
  http_access allow CONNECT localnet numeric_IPS Skype_UA

Note that Skype prefers the port 443 which is by default enabled in Squid anyway so this configuration is only needed when you block HTTPS access through the proxy. 

If you limit HTTPS access to known sites only, then permitting Skype will break that policy.

Alexey Leonchik

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