# Nginx WAF rules for XSS
location / {
    set $attack_detected 0;

    if ($request_uri ~* "(?i)<APPLET[s/+>]") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "((?:[[^]]*][^.]*.)|Reflect[^.]*.).*(?:map|sort|apply)[^.]*..*call[^`]*`.*`") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "@contains -->") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "(?i)[\"'][ ]*(?:[^a-z0-9~_:' ]|in).+?[.].+?=") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "(?i).(?:b(?:x(?:link:href|html|mlns)|data:text/html|formaction|patternb.*?=)|!ENTITY[sv]+(?:%[sv]+)?[^sv]+[sv]+(?:SYSTEM|PUBLIC)|@import|;base64)b") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "(?i)<script[^>]*>[sS]*?") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "(?i)<OBJECT[s/+].*?(?:type|codetype|classid|code|data)[s/+]*=") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "(?i)[s\"'`;/0-9=x0Bx09x0Cx3Bx2Cx28x3B]on[a-zA-Z]{3,25}[sx0Bx09x0Cx3Bx2Cx28x3B]*?=[^=]") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "(?i:<style.*?>.*?(?:@[ix5c]|(?:[:=]|&#x?0*(?:58|3A|61|3D);?).*?(?:[(x5c]|&#x?0*(?:40|28|92|5C);?)))") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "(?i:<META[s/+].*?http-equiv[s/+]*=[s/+]*[\"'`]?(?:(?:c|&#x?0*(?:67|43|99|63);?)|(?:r|&#x?0*(?:82|52|114|72);?)|(?:s|&#x?0*(?:83|53|115|73);?)))") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "(?i)b(?:s(?:tyle|rc)|href)b[sS]*?=") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "(?i:<META[s/+].*?charset[s/+]*=)") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "(?i:[\"'][ ]*(?:[^a-z0-9~_:' ]|in).*?(?:(?:l|x5cu006C)(?:o|x5cu006F)(?:c|x5cu0063)(?:a|x5cu0061)(?:t|x5cu0074)(?:i|x5cu0069)(?:o|x5cu006F)(?:n|x5cu006E)|(?:n|x5cu006E)(?:a|x5cu0061)(?:m|x5cu006D)(?:e|x5cu0065)|(?:o|x5cu006F)(?:n|x5cu006E)(?:e|x5cu0065)(?:r|x5cu0072)(?:r|x5cu0072)(?:o|x5cu006F)(?:r|x5cu0072)|(?:v|x5cu0076)(?:a|x5cu0061)(?:l|x5cu006C)(?:u|x5cu0075)(?:e|x5cu0065)(?:O|x5cu004F)(?:f|x5cu0066)).*?=)") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "(?:xbcs*/s*[^xbe>]*[xbe>])|(?:<s*/s*[^xbe]*xbe)") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "(?i)<LINK[s/+].*?href[s/+]*=") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "<[?]?import[s/+S]*?implementation[s/+]*?=") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "{{.*?}}") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "(?i)<BASE[s/+].*?href[s/+]*=") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "@detectXSS") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "(?i)<[^0-9<>A-Z_a-z]*(?:[^sv\"'<>]*:)?[^0-9<>A-Z_a-z]*[^0-9A-Z_a-z]*?(?:s[^0-9A-Z_a-z]*?(?:c[^0-9A-Z_a-z]*?r[^0-9A-Z_a-z]*?i[^0-9A-Z_a-z]*?p[^0-9A-Z_a-z]*?t|t[^0-9A-Z_a-z]*?y[^0-9A-Z_a-z]*?l[^0-9A-Z_a-z]*?e|v[^0-9A-Z_a-z]*?g|e[^0-9A-Z_a-z]*?t[^0-9>A-Z_a-z])|f[^0-9A-Z_a-z]*?o[^0-9A-Z_a-z]*?r[^0-9A-Z_a-z]*?m|m[^0-9A-Z_a-z]*?(?:a[^0-9A-Z_a-z]*?r[^0-9A-Z_a-z]*?q[^0-9A-Z_a-z]*?u[^0-9A-Z_a-z]*?e[^0-9A-Z_a-z]*?e|e[^0-9A-Z_a-z]*?t[^0-9A-Z_a-z]*?a[^0-9>A-Z_a-z])|(?:l[^0-9A-Z_a-z]*?i[^0-9A-Z_a-z]*?n[^0-9A-Z_a-z]*?k|o[^0-9A-Z_a-z]*?b[^0-9A-Z_a-z]*?j[^0-9A-Z_a-z]*?e[^0-9A-Z_a-z]*?c[^0-9A-Z_a-z]*?t|e[^0-9A-Z_a-z]*?m[^0-9A-Z_a-z]*?b[^0-9A-Z_a-z]*?e[^0-9A-Z_a-z]*?d|a[^0-9A-Z_a-z]*?(?:p[^0-9A-Z_a-z]*?p[^0-9A-Z_a-z]*?l[^0-9A-Z_a-z]*?e[^0-9A-Z_a-z]*?t|u[^0-9A-Z_a-z]*?d[^0-9A-Z_a-z]*?i[^0-9A-Z_a-z]*?o|n[^0-9A-Z_a-z]*?i[^0-9A-Z_a-z]*?m[^0-9A-Z_a-z]*?a[^0-9A-Z_a-z]*?t[^0-9A-Z_a-z]*?e)|p[^0-9A-Z_a-z]*?a[^0-9A-Z_a-z]*?r[^0-9A-Z_a-z]*?a[^0-9A-Z_a-z]*?m|i?[^0-9A-Z_a-z]*?f[^0-9A-Z_a-z]*?r[^0-9A-Z_a-z]*?a[^0-9A-Z_a-z]*?m[^0-9A-Z_a-z]*?e|b[^0-9A-Z_a-z]*?(?:a[^0-9A-Z_a-z]*?s[^0-9A-Z_a-z]*?e|o[^0-9A-Z_a-z]*?d[^0-9A-Z_a-z]*?y|i[^0-9A-Z_a-z]*?n[^0-9A-Z_a-z]*?d[^0-9A-Z_a-z]*?i[^0-9A-Z_a-z]*?n[^0-9A-Z_a-z]*?g[^0-9A-Z_a-z]*?s)|i[^0-9A-Z_a-z]*?m[^0-9A-Z_a-z]*?a?[^0-9A-Z_a-z]*?g[^0-9A-Z_a-z]*?e?|v[^0-9A-Z_a-z]*?i[^0-9A-Z_a-z]*?d[^0-9A-Z_a-z]*?e[^0-9A-Z_a-z]*?o)[^0-9>A-Z_a-z])|(?:<[0-9A-Z_a-z].*[sv/]|[\"'](?:.*[sv/])?)(?:background|formaction|lowsrc|on(?:a(?:bort|ctivate|d(?:apteradded|dtrack)|fter(?:print|(?:scriptexecu|upda)te)|lerting|n(?:imation(?:cancel|end|iteration|start)|tennastatechange)|ppcommand|u(?:dio(?:end|process|start)|xclick))|b(?:e(?:fore(?:(?:(?:(?:de)?activa|scriptexecu)t|toggl)e|c(?:opy|ut)|editfocus|input|p(?:aste|rint)|u(?:nload|pdate))|gin(?:Event)?)|l(?:ocked|ur)|oun(?:ce|dary)|roadcast|usy)|c(?:a(?:(?:ch|llschang)ed|nplay(?:through)?|rdstatechange)|(?:ell|fstate)change|h(?:a(?:rging(?:time)?cha)?nge|ecking)|l(?:ick|ose)|o(?:m(?:mand(?:update)?|p(?:lete|osition(?:end|start|update)))|n(?:nect(?:ed|ing)|t(?:extmenu|rolselect))|py)|u(?:echange|t))|d(?:ata(?:(?:availabl|chang)e|error|setc(?:hanged|omplete))|blclick|e(?:activate|livery(?:error|success)|vice(?:found|light|(?:mo|orienta)tion|proximity))|i(?:aling|s(?:abled|c(?:hargingtimechange|onnect(?:ed|ing))))|o(?:m(?:a(?:ctivate|ttrmodified)|(?:characterdata|subtree)modified|focus(?:in|out)|mousescroll|node(?:inserted(?:intodocument)?|removed(?:fromdocument)?))|wnloading)|r(?:ag(?:drop|e(?:n(?:d|ter)|xit)|(?:gestur|leav)e|over|start)|op)|urationchange)|e(?:mptied|n(?:abled|d(?:ed|Event)?|ter)|rror(?:update)?|xit)|f(?:ailed|i(?:lterchange|nish)|o(?:cus(?:in|out)?|rm(?:change|input))|ullscreenchange)|g(?:amepad(?:axismove|button(?:down|up)|(?:dis)?connected)|et)|h(?:ashchange|e(?:adphoneschange|l[dp])|olding)|i(?:cc(?:cardlockerror|infochange)|n(?:coming|put|valid))|key(?:down|press|up)|l(?:evelchange|o(?:ad(?:e(?:d(?:meta)?data|nd)|start)?|secapture)|y)|m(?:ark|essage|o(?:use(?:down|enter|(?:lea|mo)ve|o(?:ut|ver)|up|wheel)|ve(?:end|start)?|z(?:a(?:fterpaint|udioavailable)|(?:beforeresiz|orientationchang|t(?:apgestur|imechang))e|(?:edgeui(?:c(?:ancel|omplet)|start)e|network(?:down|up)loa)d|fullscreen(?:change|error)|m(?:agnifygesture(?:start|update)?|ouse(?:hittest|pixelscroll))|p(?:ointerlock(?:change|error)|resstapgesture)|rotategesture(?:start|update)?|s(?:crolledareachanged|wipegesture(?:end|start|update)?))))|no(?:match|update)|o(?:(?:bsolet|(?:ff|n)lin)e|pen|verflow(?:changed)?)|p(?:a(?:ge(?:hide|show)|int|(?:st|us)e)|lay(?:ing)?|o(?:inter(?:down|enter|(?:(?:lea|mo)v|rawupdat)e|o(?:ut|ver)|up)|p(?:state|up(?:hid(?:den|ing)|show(?:ing|n))))|ro(?:gress|pertychange))|r(?:atechange|e(?:adystatechange|ceived|movetrack|peat(?:Event)?|quest|s(?:et|ize|u(?:lt|m(?:e|ing)))|trieving)|ow(?:e(?:nter|xit)|s(?:delete|inserted)))|s(?:croll(?:end)?|e(?:arch|ek(?:complete|ed|ing)|lect(?:ionchange|start)?|n(?:ding|t)|t)|how|(?:ound|peech)(?:end|start)|t(?:a(?:lled|rt|t(?:echange|uschanged))|k(?:comma|sessione)nd|op)|u(?:bmit|ccess|spend)|vg(?:abort|error|(?:un)?load|resize|scroll|zoom))|t(?:ext|ime(?:out|update)|o(?:ggle|uch(?:cancel|en(?:d|ter)|(?:lea|mo)ve|start))|ransition(?:cancel|end|run|start))|u(?:n(?:derflow|handledrejection|load)|p(?:dateready|gradeneeded)|s(?:erproximity|sdreceived))|v(?:ersion|o(?:ic|lum)e)change|w(?:a(?:it|rn)ing|ebkit(?:animation(?:end|iteration|start)|transitionend)|heel)|zoom)|ping|s(?:rc|tyle))[x08-nf-r ]*?=") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "(?i)<EMBED[s/+].*?(?:src|type).*?=") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "<(?:a|abbr|acronym|address|applet|area|audioscope|b|base|basefront|bdo|bgsound|big|blackface|blink|blockquote|body|bq|br|button|caption|center|cite|code|col|colgroup|comment|dd|del|dfn|dir|div|dl|dt|em|embed|fieldset|fn|font|form|frame|frameset|h1|head|hr|html|i|iframe|ilayer|img|input|ins|isindex|kdb|keygen|label|layer|legend|li|limittext|link|listing|map|marquee|menu|meta|multicol|nobr|noembed|noframes|noscript|nosmartquotes|object|ol|optgroup|option|p|param|plaintext|pre|q|rt|ruby|s|samp|script|select|server|shadow|sidebar|small|spacer|span|strike|strong|style|sub|sup|table|tbody|td|textarea|tfoot|th|thead|title|tr|tt|u|ul|var|wbr|xml|xmp)W") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "(?i:<.*[:]?vmlframe.*?[s/+]*?src[s/+]*=)") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "!@validateByteRange 20, 45-47, 48-57, 65-90, 95, 97-122") {
        set $attack_detected 1;
    }

    if ($request_uri ~* "xbc[^xbe>]*[xbe>]|<[^xbe]*xbe") {
        set $attack_detected 1;
    }

    if ($attack_detected = 1) {
        return 403;
    }
}