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Barracuda Web Application Firewall

Advanced Security and Clickjacking Protection

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Advanced Security

Advanced Security allows you to set the policies like data theft protection, brute force prevention and virus scan on a key which is defined by the URL, domain and HTTP headers.

To Add an URL Policy

URL: /v1/virtual_services/{virtual_service_id}/advanced_security
Method: POST
Description: Creates an URL policy with the given values.
Parameter NameData TypeMandatoryDescription
Input Parameters:   
nameAlphanumericYesThe name of the new URL policy.
statusStringOptional

Apply the URL policy to the Service. The values include:

  • on
  • off
host_matchAlphanumericYesA host name to be matched against the host in the request.
url_matchURLYesA URL to be matched to the URL in the request.
extended_matchStringYesAn expression that consists of a combination of HTTP headers and/or query string parameters.

For information on how to write extended match expressions, refer Extended Match Syntax Help.
extended_match_sequenceNumericOptionalA number to indicate the order in which the extended match rule must be evaluated in the requests.
modeStringOptional

The mode of action for request violations matching the URL Policy. The values include:

  • active - This mode blocks the intrusions and logs the events. 
  • passive - This mode allows the intrusions to be passed to the server, but logs the events.
parse_urls_in_scriptsStringOptional

Controls whether to parse URLs in the scripts so that they can be used for URL translation or instant SSL. The values include:

  • yes
  • no
By default, this is set to Yes.
enable_virus_scanStringOptional

Scans all files uploaded through multipart/form-data messages for the presence of viruses. Requests containing virus signatures are denied. The values include:

  • yes
  • no
By default, this is set to No.
enable_data_theft_protectionStringOptional

Enable data theft protection for the service. When this is enabled and the parameter "Enabled" is set to "Yes" on the SECURITY POLICIES > Data Theft Protection page, all URL policies will look for the data type element (configured on the SECURITY POLICIES > Data Theft Protection page) in server response pages. The values include:

  • yes
  • no
By default, this is set to No.
enable_bruteforce_preventionStringOptional

Enable bruteforce attack prevention for the URL policy. The values include:

  • yes
  • no
By default, this is set to No.
rate_control_poolEnumerationOptionalThe rate control pool(s) defined on the ADVANCED > Libraries page (if any).
web_scraping_policyEnumerationOptionalThe web scraping policy that needs to be associated with the URL policy of the service. A web scraping policy can be created on the WEBSITES > Web Scraping page.
Example

Request:

curl http://10.11.28.58:8000/restapi/v1/virtual_services/service1/advanced_security -u'eyJldCI6IjE0NzMzMTUxMTYiLCJwYXNzd29yZCI6ImU3MGZlNzFjMTNkZGNhMDAyZTgzNTk3YzZl\nYTg2MmQ1IiwidXNlciI6ImFkbWluIn0=\n:' -X POST -H Content-Type:application/json -d'{"name":"policy","host_match":"www.xyz.com","url_match":"/frames/deeptree/start_11.php/indexing/","extended_match":"*","extended_match_sequence":"1","status":"on","mode":"active","parse_urls_in_scripts":"yes","enable_virus_scan":"yes","enable_bruteforce_prevention":"yes","enable_data_theft_protection":"yes","rate_control_pool":"default-pool"}'

Response:

{"id":"policy","token":"eyJldCI6IjE0NzMzMTUyMTAiLCJwYXNzd29yZCI6IjRmNWJlZjY5MjcwOTllNmNjYTYzNzFjMjk1\nZTdhZTZhIiwidXNlciI6ImFkbWluIn0=\n"}

To Update an URL Policy

URL: /v1/virtual_services/{virtual_service_id}/advanced_security/{URL_policy_id}
Method: PUT
Description: Updates the values of given parameters in the given URL policy
Parameter NameData TypeMandatoryDescription
Input Parameters:   
statusStringOptional

Apply the URL policy to the Service. The values include:

  • on
  • off
host_matchAlphanumericOptionalA host name to be matched against the host in the request.
url_matchURLOptionalA URL to be matched to the URL in the request.
extended_matchStringOptionalAn expression that consists of a combination of HTTP headers and/or query string parameters.

For information on how to write extended match expressions, refer Extended Match Syntax Help.
extended_match_sequenceNumericOptionalA number to indicate the order in which the extended match rule must be evaluated in the requests.
modeStringOptional

The mode of action for request violations matching the URL Policy. The values include:

  • active - This mode blocks the intrusions and logs the events. 
  • passive - This mode allows the intrusions to be passed to the server, but logs the events.
parse_urls_in_scriptsStringOptional

Controls whether to parse URLs in the scripts so that they can be used for URL translation or instant SSL. The values include:

  • yes
  • no
By default, this is set to Yes.
enable_virus_scanStringOptional

Scans all files uploaded through multipart/form-data messages for the presence of viruses. Requests containing virus signatures are denied. The values include:

  • yes
  • no
By default, this is set to No.
response_charsetEnumerationOptional

The character set to be used in the response page. The enumerated values include:

  • ascii
  • iso-8859-1
  • utf-8
  • gbk
  • gb2312
  • iso-2022-cn
  • hz
  • big5
  • euc-tw
  • shift-jis
  • euc-jp
  • iso-2022-jp
  • euc-kr
  • johab
  • iso-2022-kr
  • none
web_scraping_policyEnumerationOptionalThe web scraping policy that needs to be associated with the URL policy of the service. A web scraping policy can be created on the WEBSITES > Web Scraping page.
enable_data_theft_protectionStringOptional

Enable data theft protection for the service. When this is enabled and the parameter "Enabled" is set to "Yes" on the SECURITY POLICIES > Data Theft Protection page, all URL policies will look for the data type element (configured on the SECURITY POLICIES > Data Theft Protection page) in server response pages. The values include:

  • yes
  • no
By default, this is set to No.
rate_control_poolEnumerationOptionalThe rate control pool(s) defined on the ADVANCED > Libraries page (if any).
enable_bruteforce_preventionStringOptional

Enable bruteforce attack prevention for the URL policy. The values include:

  • yes
  • no
By default, this is set to No.
enable_invalid_status_code_onlyStringOptional

Monitors and counts only invalid requests from a single client or all sources. If set to no, it counts both valid and invalid requests from a single client or all sources. It blocks the requests when it exceeds the specified value in max_allowed_accesses_per_ip and max_allowed_accesses_from_all_sources. The values include:

  • yes
  • no
count_windowNumericOptional

The time in seconds for allowing the maximum number of requests as per the settings in the parameter max_allowed_accesses_per_ip or max_allowed_accesses_from_all_sources.

  • Range – 1 to 3600.
max_allowed_accesses_per_ipNumericOptionalThe maximum number of requests allowed per IP address to access the service, if the parameter counting_criterion is set to per_ip.
counting_criterionStringOptional

The criteria for allowing the requests. The values include:

  • per_ip
  • all_sources
exception_clientsAlphanumericOptionalThe IP addresses that should be exempted (not locked out). You can enter a single, or a range of IP addresses, or a combination of both with comma (,) as a delimiter without any space. Example: 10.10.10.10,11.11.11.11,10.10.11.11. The range of IP addresses must be separated with a hyphen (-). Example: 10.10.10.1-10.10.10.10. This makes an exception list of client IPs (permitted users). Ensure that there are no overlapping IP ranges.
Example

Request:

curl http://10.11.28.58:8000/restapi/v1/virtual_services/service1/advanced_security/policy -u'eyJldCI6IjE0NzMzMTUxMTYiLCJwYXNzd29yZCI6ImU3MGZlNzFjMTNkZGNhMDAyZTgzNTk3YzZl\nYTg2MmQ1IiwidXNlciI6ImFkbWluIn0=\n:' -X PUT -H Content-Type:application/json -d'{"enable_invalid_status_code_only":"yes","count_window":"20","max_allowed_accesses_per_ip":"11","counting_criterion":"all_sources","exception_clients":"10.11.23.63"}'

Response:

{"id":"policy","token":"eyJldCI6IjE0NzMzMTYzNzAiLCJwYXNzd29yZCI6Ijc4YjczYjI2ZDJhOGI0OWQ2NzRhMzExNmJj\nYWQxYWZkIiwidXNlciI6ImFkbWluIn0=\n"}

To Delete a URL Policy

URL: /v1/virtual_services/{virtual_service_id}/advanced_security/{url_policy-id}
Method: DELETE
Description: Deletes the given URL policy.
Example

Request:

curl http://10.11.28.58:8000/restapi/v1/virtual_services/service1/advanced_security/policy -u'eyJldCI6IjE0NjQyNTQwOTUiLCJwYXNzd29yZCI6IjljZmQwMDM4NWE2NzZlYmZkMjQxNTczYTkx\nODRlM2FmIiwidXNlciI6ImFkbWluIn0=\n:' -X DELETE

Response:-

{"msg":"Successfully deleted","token":"eyJldCI6IjE0NzMzMTcwNjkiLCJwYXNzd29yZCI6IjA2MTdhODQ5OTA5YzllOTlkNmYzOTMyMjg4\nODcxNmQxIiwidXNlciI6ImFkbWluIn0=\n"}

Clickjacking Protection

Clickjacking (also known as UI redressing and iframe overlay) is a malicious technique where an attacker tricks a user to click on a button or link on a website by hiding clickable elements inside an invisible iframe. By this, the attacker hijacks the clicks meant for the actual page and routes the user to another page which is owned by another application, domain or both. The X-Frame-Options HTTP response header can be used to detect and prevent such iframe based UI redressing. The Barracuda Web Application Firewall inserts the X-Frame-Options header to determine whether a browser should be allowed to render a page in a "iframe", and if allowed, the iframe origin that needs to be matched. For more information, refer to Enabling Clickjacking Protection for a Service.

To Update a Clickjacking Protection Policy for a Service

URL: /v1/virtual_services/{virtual_service_id}/clickjacking_protection
Method: PUT
Description: Updates the values of given parameters in the given clickjacking protection policy
Parameter NameData TypeMandatoryDescription
Input Parameters:   
statusStringOptional

Insert the “X-Frame-Options” header in the responses. The values include:

  • on
  • off
render_page_inside_iframeStringOptional

The option to render the page. The values include:

  • never - The browser will not display the page if the page is within the iframe.
  • same_origin - The browser allows the page to be displayed if the page within the iframe is from the same origin. 
  • allowed_origin - The browser allows the page specified in the allowed_origin to be displayed when embedded in the iframe.
allowed_origin_uriAlphanumericOptionalThe origin URI that needs to be rendered even if it is in an iframe when render_page_inside_iframe is set to allowed_origin.
Example

Request

curl http://10.11.28.58:8000/restapi/v1/virtual_services/service1/clickjacking_protection -u'eyJldCI6IjE0NzMzMTcwNjkiLCJwYXNzd29yZCI6IjA2MTdhODQ5OTA5YzllOTlkNmYzOTMyMjg4\nODcxNmQxIiwidXNlciI6ImFkbWluIn0=\n:' -X PUT -H Content-Type:application/json -d '{"status":"on","render_page_inside_iframe":"allowed_origin","allowed_origin_uri":"/data/index/cgi"}'

Response:

{"msg":"Configuration Updated","token":"eyJldCI6IjE0NzMzMTgxNjciLCJwYXNzd29yZCI6IjViNDA5YzAwM2RmMjI3NWZmMzZjMWM5YzE1\nNDNmYmI5IiwidXNlciI6ImFkbWluIn0=\n"}

Last updated on