Text Analyzer

Text Analyzer

Overview

Text Analyzer enables you to detect and restrict access to websites that may contain inappropriate or pornographic content based on a keyword scoring system.
Text analyzer is particularly useful in detecting unclassified websites that could serve inappropriate content.
This feature can be effectively used to block websites belonging to specific categories, without having to depend on any database.
When a keyword from the list of words specified in an entry is found, the page is given the score specified in that entry. The total score of the page is equal to the sum of the scores of all the rules that match.
When the total score is equal to or greater than the threshold, then the page is blocked.

Global

Text-global.jpg

Enabled

Enable or Disable the text analyzer section.
  1. TRUE: Enable text analyzer section.
  1. FALSE: Disable the text analyzer section.

Threshold

The number of the total score must equal or exceed until the page is blocked.

Template

Templates are used throughout Safesquid as a replacement for pages that can't be displayed due to filtering, error, or other conditions.
Specify the template name that should be displayed on a user's screen when this entry matches. The name should be selected from the template section, which contains the template's name.
Leave this rule blank, to use the default template.

Filtering policies

Here you can add the new policies to block the websites based on content type.
You can give the score to each policy and the keywords to block inappropriate content.
Text-policy.jpg

Enabled

Enable or Disable this Policy.
  1. TRUE: Enable this entry.
  1. FALSE: Disable this entry.

Comment

For documentation and future references, explain the relevance of this entry with your policies.
That is, by reading the policies, a future user can understand the purpose of that entry.

Profiles

Specify the Profiles applicable for this entry.
This entry will be applicable only if the connection has any one of the specified profiles.
Leave it Blank, to apply for all connections irrespective of any applied profile.
To avoid application to a connection that has a profile, use a negated profile (!profile).

Mime type

It's a way of identifying files on the Internet according to their nature and format.
It is highly advisable that you set this to some mime type; otherwise, all files will be checked.
A regular expression matching the mime types this entry policy applies to.
Example: text/html, ^image/,^application/, application/x-shockwave-flash.

Keyword(s)

A regular expression matching anything in the body of the document is considered inappropriate, leave blank to match everything.
We can add more than one keyword in a single policy.
Example: (sex|sexy|porn|pornography).

Score

This entry adds to the total score when it matches, this may be a positive or negative integer.
If you mention a keyword as an adult, then every time this word is found in the document the score mentioned will be added.
Example: If you mentioned the score as 20, then if the word adult was found once in the requested document then 20 will be added, for two times it will be 40, three times
it will be 60.

Example

Rule#1

I want to block web pages based on the defined keywords.
For connections with the profile “TEXT ANALYZER FOR SAFESQUID’ will search for the keywords SafeSquid, proxy, swg, web proxy, squid, Perimeter security solution and secure web gateway.
For any keywords matched, the webpage is being scored and if the score reaches equal to or above the thread hold which is 100 web pages will be blocked.
For example: if the webpage consists of the words SafeSquid then the text analyzer will score 60, on the next successful match of the defined keyword it will now be 120.
120 is above the threshold and hence it will block the page and you’ll receive SafeSquid’s blocked_bypass template.
Text analyzer can be used in situations where uncategorized websites serve inappropriate content.
Example: Articles, news etc.
Slide1-txtAnlyz.png




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