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98 lines
5.4 KiB
ReStructuredText
98 lines
5.4 KiB
ReStructuredText
:tocdepth: 3
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policy/protocols/http/detect-sqli.bro
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=====================================
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.. bro:namespace:: HTTP
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SQL injection attack detection in HTTP.
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:Namespace: HTTP
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:Imports: :doc:`base/frameworks/notice </scripts/base/frameworks/notice/index>`, :doc:`base/frameworks/sumstats </scripts/base/frameworks/sumstats/index>`, :doc:`base/protocols/http </scripts/base/protocols/http/index>`
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Summary
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~~~~~~~
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Redefinable Options
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###################
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=============================================================================== ================================================================
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:bro:id:`HTTP::collect_SQLi_samples`: :bro:type:`count` :bro:attr:`&redef` Collecting samples will add extra data to notice emails
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by collecting some sample SQL injection url paths.
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:bro:id:`HTTP::match_sql_injection_uri`: :bro:type:`pattern` :bro:attr:`&redef` Regular expression is used to match URI based SQL injections.
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:bro:id:`HTTP::sqli_requests_interval`: :bro:type:`interval` :bro:attr:`&redef` Interval at which to watch for the
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:bro:id:`HTTP::sqli_requests_threshold` variable to be crossed.
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:bro:id:`HTTP::sqli_requests_threshold`: :bro:type:`double` :bro:attr:`&redef` Defines the threshold that determines if an SQL injection attack
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is ongoing based on the number of requests that appear to be SQL
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injection attacks.
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=============================================================================== ================================================================
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Redefinitions
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#############
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========================================== =
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:bro:type:`HTTP::Tags`: :bro:type:`enum`
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:bro:type:`Notice::Type`: :bro:type:`enum`
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========================================== =
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Hooks
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#####
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============================================= =======================================================================
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:bro:id:`HTTP::sqli_policy`: :bro:type:`hook` A hook that can be used to prevent specific requests from being counted
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as an injection attempt.
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============================================= =======================================================================
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Detailed Interface
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~~~~~~~~~~~~~~~~~~
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Redefinable Options
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###################
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.. bro:id:: HTTP::collect_SQLi_samples
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:Type: :bro:type:`count`
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:Attributes: :bro:attr:`&redef`
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:Default: ``5``
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Collecting samples will add extra data to notice emails
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by collecting some sample SQL injection url paths. Disable
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sample collection by setting this value to 0.
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.. bro:id:: HTTP::match_sql_injection_uri
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:Type: :bro:type:`pattern`
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:Attributes: :bro:attr:`&redef`
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:Default:
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::
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/^?((^?((^?((^?((^?((^?([\?&][^[:blank:]\x00-\x37\|]+?=[\-[:alnum:]%]+([[:blank:]\x00-\x37]|\/\*.*?\*\/)*['"]?([[:blank:]\x00-\x37]|\/\*.*?\*\/|\)?;)+.*?([hH][aA][vV][iI][nN][gG]|[uU][nN][iI][oO][nN]|[eE][xX][eE][cC]|[sS][eE][lL][eE][cC][tT]|[dD][eE][lL][eE][tT][eE]|[dD][rR][oO][pP]|[dD][eE][cC][lL][aA][rR][eE]|[cC][rR][eE][aA][tT][eE]|[iI][nN][sS][eE][rR][tT])([[:blank:]\x00-\x37]|\/\*.*?\*\/)+)$?)|(^?([\?&][^[:blank:]\x00-\x37\|]+?=[\-0-9%]+([[:blank:]\x00-\x37]|\/\*.*?\*\/)*['"]?([[:blank:]\x00-\x37]|\/\*.*?\*\/|\)?;)+([xX]?[oO][rR]|[nN]?[aA][nN][dD])([[:blank:]\x00-\x37]|\/\*.*?\*\/)+['"]?(([^a-zA-Z&]+)?=|[eE][xX][iI][sS][tT][sS]))$?))$?)|(^?([\?&][^[:blank:]\x00-\x37]+?=[\-0-9%]*([[:blank:]\x00-\x37]|\/\*.*?\*\/)*['"]([[:blank:]\x00-\x37]|\/\*.*?\*\/)*(-|=|\+|\|\|)([[:blank:]\x00-\x37]|\/\*.*?\*\/)*([0-9]|\(?[cC][oO][nN][vV][eE][rR][tT]|[cC][aA][sS][tT]))$?))$?)|(^?([\?&][^[:blank:]\x00-\x37\|]+?=([[:blank:]\x00-\x37]|\/\*.*?\*\/)*['"]([[:blank:]\x00-\x37]|\/\*.*?\*\/|;)*([xX]?[oO][rR]|[nN]?[aA][nN][dD]|[hH][aA][vV][iI][nN][gG]|[uU][nN][iI][oO][nN]|[eE][xX][eE][cC]|[sS][eE][lL][eE][cC][tT]|[dD][eE][lL][eE][tT][eE]|[dD][rR][oO][pP]|[dD][eE][cC][lL][aA][rR][eE]|[cC][rR][eE][aA][tT][eE]|[rR][eE][gG][eE][xX][pP]|[iI][nN][sS][eE][rR][tT])([[:blank:]\x00-\x37]|\/\*.*?\*\/|[\[(])+[a-zA-Z&]{2,})$?))$?)|(^?([\?&][^[:blank:]\x00-\x37]+?=[^\.]*?([cC][hH][aA][rR]|[aA][sS][cC][iI][iI]|[sS][uU][bB][sS][tT][rR][iI][nN][gG]|[tT][rR][uU][nN][cC][aA][tT][eE]|[vV][eE][rR][sS][iI][oO][nN]|[lL][eE][nN][gG][tT][hH])\()$?))$?)|(^?(\/\*![[:digit:]]{5}.*?\*\/)$?))$?/
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Regular expression is used to match URI based SQL injections.
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.. bro:id:: HTTP::sqli_requests_interval
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:Type: :bro:type:`interval`
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:Attributes: :bro:attr:`&redef`
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:Default: ``5.0 mins``
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Interval at which to watch for the
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:bro:id:`HTTP::sqli_requests_threshold` variable to be crossed.
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At the end of each interval the counter is reset.
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.. bro:id:: HTTP::sqli_requests_threshold
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:Type: :bro:type:`double`
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:Attributes: :bro:attr:`&redef`
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:Default: ``50.0``
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Defines the threshold that determines if an SQL injection attack
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is ongoing based on the number of requests that appear to be SQL
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injection attacks.
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Hooks
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#####
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.. bro:id:: HTTP::sqli_policy
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:Type: :bro:type:`hook` (c: :bro:type:`connection`, method: :bro:type:`string`, unescaped_URI: :bro:type:`string`) : :bro:type:`bool`
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A hook that can be used to prevent specific requests from being counted
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as an injection attempt. Use a 'break' statement to exit the hook
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early and ignore the request.
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