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litespeed_wiki:lslb:recaptcha [2019/05/17 18:43]
Lisa Clarke Copyediting 		litespeed_wiki:lslb:recaptcha [2020/11/18 15:44]
Lisa Clarke Redirect to new Documentation Site
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-====== reCAPTCHA with LiteSpeed Web ADC ====== +~~REDIRECT>​https://​docs.litespeedtech.com/products/lsadc/security/~~
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-As of LiteSpeed ADC 2.4, reCAPTCHA is available as a method of defense against DDoS attack. +
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-===== How To Enable at the Server Level ===== +
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-Access the WebAdmin console via ''<​nowiki>​https://​YOUR_SERVER_IP:​7090 </​nowiki>''​ +
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-Navigate to **Configuration > Server > Security > reCAPTCHA Protection** +
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-{{:​litespeed_wiki:​lslb:​adc-recaptcha1.jpg|}} +
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-Set **Enable reCAPTCHA** to ''​Yes''​. This is the master switch and it is required for enabling at the vhost level. +
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-For other options, hover over the ''?''​ symbol to view detailed information about that option. +
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-Unlike LSWS, there are no sensitivity options for ADC. As an equivalent, it is determined by concurrent connection level. reCAPTCHA will be activated once concurrent requests count reaches the configured connection limit. +
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-===== How To Enable at the Virtual Host Level ===== +
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-Server-level reCAPTCHA must be enabled, as it is a master switch. +
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-Virtual-host-level connection limits will override server level. +
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-You can enable virtual-host-level reCAPTCHA through rewrite rules or through the WebAdmin console. +
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-==== Enable reCAPTCHA For Virtual Hosts Through Rewrite Rules ==== +
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-From the Virtual Host configuration screen, navigate to **Rewrite**,​ set **Enable Rewrite** to ''​Yes''​ and enter either the ''​[E=verifycaptcha]''​ or ''​[E=verifycaptcha:​ ACTION]''​ directive:​ +
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-{{:​litespeed_wiki:​lslb:​adc-recaptcha2.png|}} +
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-''​[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. +
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-For example: +
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-<​code>​RewriteCond SOME-CONDITIONAL-CHECK +
-RewriteRule .* - [E=verifycaptcha]<​/code> +
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-(''​SOME-CONDITIONAL-CHECK''​ would be a suspicious UA, IP address, etc.) +
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-==== Enable reCAPTCHA for LiteSpeed ADC Virtual Hosts ====  +
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-You can also use LiteSpeed ADC WebAdmin console to enable reCAPTCHA. +
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-Navigate to **Configuration > Virtual Hosts > Security** and set **reCAPTCHA Protection** to ''​Yes''​. +
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-{{:​litespeed_wiki:​lslb:​adc-recaptcha3.jpg|}} +
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-===== Customizing the Good Bots List ===== +
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-Google bots are considered good bots because they help index your site. However, they cannot do their job properly without receiving the correct page. The **Bot White List** configuration may be used to specify bots that you may need for your site. +
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-{{:​litespeed_wiki:​lslb:​adc-recaptcha4.jpg|}} +
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-Here, we have configured ''​Edge''​ in the **Bot White List** text area. Bot White List is a ''​contains''​ match, but regex may be used as well. +
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-After restarting, browsers containing "​Edge"​ in the user-agent header will bypass reCAPTCHA:​ +
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-{{ :​litespeed_wiki:​config:​recaptcha6.png?​800 |The browser on the left is Microsoft Edge, the browser on the right is Chrome.}} +
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-The **Allowed Robot Hits** configuration may be used to limit how many times a good bot (including Googlebot) is allowed to hit a URL before it is redirected to reCAPTCHA as well. This may be useful to prevent bad actors from bypassing reCAPTCHA using a custom user agent. +
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-===== Customizing the reCAPTCHA Page ===== +
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-The default reCAPTCHA page is generic. If you would like to customize the page, you may do so by creating a file at ''​$SERVER_ROOT/lsrecaptcha/_recaptcha_custom.shtml''​. +
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-There are two script tags that are required and it is strongly recommended to avoid changing the ''​form''​ and the ''​recaptchadiv''​ unless you know what you are doing. There are three echos within the page itself. Those are used by the web server to customize the reCAPTCHA type and keys and specify any query string used. +
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-Beyond those required attributes, everything else is customizable. As noted before, please ensure that you have backups of the default page and your customized page. Note that the ''​.shtml''​ extension is required in order to use configured type and keys. +
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-===== 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. +
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-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. +
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-===== reCAPTCHA Returning 403 and Dropping Connection ===== +
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-If reCAPTCHA fails a few times, it will return a 403 error and then drop the connection from that IP. It is the way it works in order to block attacks. If the ''​invisible''​ reCAPTCHA keeps auto-refreshing and then fails, just change the type to ''​one-click''​.+
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  • Last modified: 2020/11/18 15:44
  • by Lisa Clarke