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litespeed_wiki:config:recaptcha [2019/06/14 20:29]
Lisa Clarke [Advanced Configuration: Define reCAPTCHA Actions Through Rewrite Rules]
litespeed_wiki:config:recaptcha [2019/09/23 14:25] (current)
Jackson Zhang [Advanced Configuration: Define reCAPTCHA Actions Through Rewrite Rules]
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-When a visitor accesses the website , they will need to go though reCAPTCHA validation ​to protect ​against ​a DDoS attack such as HTTP Flood.+When a visitor accesses the website, they will need to go though reCAPTCHA validation. This validation protects the server ​against HTTP Flood and other DDoS attacks. 
 + 
 +After passing the reCAPTCHA validation, the visitor is temporarily whitelisted as long as they continue to browse the site. This makes for a better user experience. Once the visitor has been inactive for more than 20 minutes, reCAPTCHA is once again enabled for that visitor'​s next request.
  
 {{:​litespeed_wiki:​config:​recaptcha3.jpg|}} {{:​litespeed_wiki:​config:​recaptcha3.jpg|}}
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-===== Advanced Configuration:​ Define ​reCAPTCHA Actions Through Rewrite Rules =====+===== End-user can define ​reCAPTCHA Actions Through Rewrite Rules in .htaccess ​===== 
 +If Server System Admin would like the end-user to control/​enable reCAPTCHA through .htaccess, System Admin will need to enable reCAPTCHA from server level globally and set server sensitivity to ''​0''​ first. ​
  
-If you want to further define the reCAPTCHA action as ''​deny'' ​or ''​drop''​, you can use one of the following rewrite rule directives in control panel virtual host document root .htaccess:+''​[E=verifycaptcha]'' ​can be used to enable reCAPTCHA to override server-level ​''​0'' ​sensitivity.
  
-''​[E=verifycaptcha]''​ or ''​[E=verifycaptchaACTION]''​+For example:
  
-''​[E=verifycaptcha]'' ​will always redirect to reCAPTCHA until verified. ''​ACTION''​ can be ''​deny'' ​to return a 403 or ''​drop'' ​to drop the connection when **Max Tries** is reached. Until Max Tries is reached, the client will be redirected to reCAPTCHA.+<​code>​ 
 +<​IfModule LiteSpeed>​ 
 +RewriteCond SOME-CONDITIONAL-CHECK 
 +RewriteRule .* - [E=verifycaptcha] 
 +</​IfModule>​ 
 +</​code>​ 
 + 
 +(''​SOME-CONDITIONAL-CHECK'' ​would be a suspicious UA, IP address, etc.) 
 + 
 +The end user can even further define the reCAPTCHA action as ''​deny''​ or ''​drop'' ​in .htaccess through ''​[E=verifycaptcha:​ ACTION]''​
  
 For example: For example:
 +<​code>​
 +<​IfModule LiteSpeed>​
 +RewriteCond SOME-CONDITIONAL-CHECK
 +RewriteRule .* - [E=verifycaptcha:​ deny]
 +</​IfModule>​
 +</​code>​
  
-<​code>​RewriteCond SOME-CONDITIONAL-CHECK+or 
  
-RewriteRule .* - [E=verifycaptcha]</​code>​+<​code>​ 
 +<​IfModule LiteSpeed>​ 
 +RewriteCond SOME-CONDITIONAL-CHECK 
 +RewriteRule .* - [E=verifycaptcha: drop] 
 +</​IfModule>​ 
 +</​code>​
  
-(''​SOME-CONDITIONAL-CHECK'' ​would be a suspicious UAIP address, etc.)+**NOTE1**''​[E=verifycaptcha]'' ​will always redirect to reCAPTCHA until verified. ''​ACTION''​ can be ''​deny''​ to return ​403 or ''​drop''​ to drop the connection when **Max Tries** is reached. Until Max Tries is reachedthe client will be redirected to reCAPTCHA.
  
-**NOTE**: In most cases, rewrite rules will override the default server behavior. However, in cases where trigger sensitivity is high, visitors may be sent directly to reCAPTCHA before the rewrite rules can even be processed.+**NOTE2**: In most cases, rewrite rules will override the default server behavior. However, in cases where trigger sensitivity is high, visitors may be sent directly to reCAPTCHA before the rewrite rules can even be processed.
  
 ===== Customize the Good Bots List ===== ===== Customize the Good Bots List =====
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 {{:​litespeed_wiki:​config:​recaptcha5.png|}} {{:​litespeed_wiki:​config:​recaptcha5.png|}}
  
-Here, we have configured '​Edge'​ in the Bot Whitelist text area. Bot Whitelist is a '​contains'​ match, but regex may be used as well.+Here, we have configured ​''Edge'' in the Bot Whitelist text area. Bot Whitelist is a ''​contains'' match (case sensitive), but regex may be used as well.
  
 After restarting, browsers containing Edge in the user-agent header will bypass reCAPTCHA: After restarting, browsers containing Edge in the user-agent header will bypass reCAPTCHA:
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 ===== Apply Your Own Site Key ===== ===== Apply Your Own Site Key =====
-You can apply your own reCAPTCHA key and adjust the configuration as you like. Client verification is completely determined by Google'​s reCAPTCHA service. The invisible type may display a difficult puzzle.+You can apply your own reCAPTCHA key and adjust the configuration as you like from [[https://​developers.google.com/​recaptcha/​intro|here]]. Client verification is completely determined by Google'​s reCAPTCHA service. The invisible type may display a difficult puzzle.
  
-For server wide protection that needs to cover a lot of domains, make sure ''​Verify the origin of reCAPTCHA''​ solutions is unchecked. Otherwise, you may need to apply a key for each domain.+For server wide protection that needs to cover a lot of domains, make sure ''​Verify the origin of reCAPTCHA''​ solutions is unchecked. Otherwise, you may need to apply a key for each domain. Please refer to google doc [[https://​developers.google.com/​recaptcha/​docs/​domain_validation|here]].
  
 ===== Set Trigger Sensitivity ===== ===== Set Trigger Sensitivity =====
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 Active connections * 100 / **Max Connections** > (100 - **Trigger Sensitivity**) Active connections * 100 / **Max Connections** > (100 - **Trigger Sensitivity**)
 +
 +For example:
 +
 +If **Max Connections** = ''​1000'',​ **Trigger Sensitivity** = ''​20'',​ and you currently have 900 connections,​ the formula would be evaluated like so:
 +
 +900 * 100 / 1000 > 100 - 20
 +
 +90 > 80 
 +
 +The result is true, so the incoming connection //will// be given a reCAPTCHA test.
 +
 +Calculating backwards, you can see that when the number of connections drops to less than 800, reCAPTCHA will not be invoked.
 +
  
 ===== reCAPTCHA Returning 403 and Dropping Connection ===== ===== reCAPTCHA Returning 403 and Dropping Connection =====
  • Admin
  • Last modified: 2019/06/14 20:29
  • by Lisa Clarke