{"id":32724,"date":"2019-10-31T21:48:35","date_gmt":"2019-10-31T18:48:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/chto-est-chto-i-kto-est-kto-na-rynke-zashhity-ot-ddos\/"},"modified":"2019-10-31T21:48:35","modified_gmt":"2019-10-31T18:48:35","slug":"chto-est-chto-i-kto-est-kto-na-rynke-zashhity-ot-ddos","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/administrirovanie\/chto-est-chto-i-kto-est-kto-na-rynke-zashhity-ot-ddos","title":{"rendered":"Vad \u00e4r vad och vem \u00e4r vem p\u00e5 marknaden f\u00f6r DDoS-skydd","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00abPojken som gjorde v\u00e5r webbplats har redan st\u00e4llt in DDoS-skyddet.\u00bb<br \/>\n\u00abVi har ju DDoS-skydd, varf\u00f6r kraschade webbplatsen?\u00bb<br \/>\n\u00abHur m\u00e5nga tusen vill Qrator ha?\u00bb<\/p>\n<p>F\u00f6r att kunna svara bra p\u00e5 s\u00e5dana fr\u00e5gor fr\u00e5n kunder\/chefer, skulle det vara bra att veta vad som d\u00f6ljer sig bakom termen \u201eDDoS-skydd\u201c. Valet av skyddstj\u00e4nster p\u00e5minner mer om att v\u00e4lja medicin av en l\u00e4kare \u00e4n att v\u00e4lja ett bord p\u00e5 IKEA.<\/p>\n<p>Jag har arbetat med webbplatsst\u00f6d i 11 \u00e5r, upplevt hundratals attacker mot de tj\u00e4nster jag st\u00f6der, och nu ska jag ber\u00e4tta lite om insidan av skyddet.<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/hh\/qr\/ab\/hhqrabfc2kbsjf6aj3bmimutclu.png\"><img decoding=\"async\" alt=\"Vad \u00e4r vad och vem \u00e4r vem p\u00e5 marknaden f\u00f6r DDoS-skydd\" src=\"\/wp-content\/uploads\/2019\/04\/8dcd7f2120dd49fa7d19c8e9a3dee354.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><br \/>\n<i>Regelbundna attacker. Totalt 350k f\u00f6rfr\u00e5gningar, 52k f\u00f6rfr\u00e5gningar legitima.<\/i><br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nDe f\u00f6rsta attackerna d\u00f6k upp n\u00e4stan samtidigt med internet. DDoS som fenomen blev massiv fr\u00e5n slutet av 2000-talet (kolla in <noindex>www.cloudflare.com\/learning\/ddos\/famous-ddos-attacks<\/noindex>).<br \/>\nFr\u00e5n ungef\u00e4r 2015-2016 b\u00f6rjade n\u00e4stan alla webbhotell att implementera DDoS-skydd, precis som de flesta framtr\u00e4dande webbplatser inom konkurrensutsatta omr\u00e5den (g\u00f6r en whois p\u00e5 IP f\u00f6r webbplatser som eldorado.ru, leroymerlin.ru, tilda.ws, s\u00e5 ser du skyddsn\u00e4tverken).<\/p>\n<p>Om 10-20 \u00e5r sedan kunde de flesta attacker avv\u00e4rjas direkt p\u00e5 servern (v\u00e4rdera rekommendationerna fr\u00e5n systemadministrat\u00f6ren Maxime Moshkov fr\u00e5n Lenta.ru p\u00e5 90-talet: <noindex><a rel=\"nofollow\" href=\"http:\/\/lib.ru\/WEBMASTER\/sowetywww2.txt_with-big-pictures.html#10\">lib.ru\/WEBMASTER\/sowetywww2.txt_with-big-pictures.html#10<\/a><\/noindex>), s\u00e5 har skyddsuppgifterna blivit mer komplexa nu.<\/p>\n<h2>Typer av DDoS-attacker ur valet av skyddstj\u00e4nstoperat\u00f6r<\/h2>\n<h4>Attacker p\u00e5 niv\u00e5 L3 \/ L4 (enligt OSI-modellen)<\/h4>\n<p> \u2014 UDP-flod fr\u00e5n botn\u00e4t (m\u00e5nga f\u00f6rfr\u00e5gningar skickas direkt fr\u00e5n infekterade enheter till den attackerade tj\u00e4nsten och \u00f6verbelastar serverns bandbredd);<br \/>\n \u2014 DNS\/NTP\/etc. f\u00f6rst\u00e4rkning (m\u00e5nga f\u00f6rfr\u00e5gningar skickas fr\u00e5n infekterade enheter till s\u00e5rbara DNS\/NTP\/etc, avs\u00e4ndaradressen f\u00f6rfalskas, ett fl\u00f6de av paket med svar p\u00e5 f\u00f6rfr\u00e5gningarna \u00f6versv\u00e4mmer bandbredden till den som attackeras; detta \u00e4r hur de mest massiva attackerna genomf\u00f6rs p\u00e5 internet idag);<br \/>\n \u2014 SYN \/ ACK-flod (m\u00e5nga f\u00f6rfr\u00e5gningar skickas till de attackerade servrarna f\u00f6r att etablera en koppling, vilket leder till \u00f6verbelastning av k\u00f6er f\u00f6r anslutningar);<br \/>\n \u2014 attacker med paketfragmentering, ping of death, pingflod (googla g\u00e4rna);<br \/>\n \u2014 osv.<\/p>\n<p>Dessa attacker syftar till att \"\u00f6versv\u00e4mma\" kanalen till servern eller \"d\u00f6da\" dess f\u00f6rm\u00e5ga att ta emot ny trafik.<br \/>\n\u00c4ven om SYN\/ACK-flod och f\u00f6rst\u00e4rkning skiljer sig \u00e5t, hanterar m\u00e5nga f\u00f6retag dem p\u00e5 samma s\u00e4tt. Problem uppst\u00e5r med attacker fr\u00e5n n\u00e4sta grupp.<\/p>\n<h4>Attacker p\u00e5 L7 (applikationsniv\u00e5)<\/h4>\n<p> \u2014 http-flod (om en webbplats eller n\u00e5got http-api attackeras);<br \/>\n \u2014 attack on vulnerable parts of the website (those without cache, heavily load the site, etc.).<\/p>\n<p>The goal is to make the server \"work hard\", process many \"seemingly real requests\" and be left without resources for actual requests.<\/p>\n<p>Although there are other attacks, these are the most common.<\/p>\n<p>Serious attacks at the L7 level are created uniquely for each targeted project.<\/p>\n<p><b>Why 2 groups?<\/b><br \/>\nBecause there are many who can effectively fend off attacks at the L3 \/ L4 level, but either do not take on application-level (L7) protection at all, or currently handle them weaker than alternatives.<\/p>\n<h2>Who is who in the DDoS protection market<\/h2>\n<p>\n(my personal view)<\/p>\n<h4>Protection at the L3 \/ L4 level<\/h4>\n<p>To fend off amplification attacks (\"overloading\" the server channel), wide channels are sufficient (many protection services connect to most major backbone providers in Russia and possess channels with a theoretical capacity of over 1 Tbps). Don't forget that very rare amplification attacks last longer than an hour. If you're Spamhaus and not liked by everyone \u2014 yes, they may attempt to take down the channels for several days even at the risk of the future survival of the utilized global botnet. If you simply have an online store, even if it's mvideo.ru \u2014 1 Tbps for several days won't be seen very soon (I hope).<\/p>\n<p>To fend off SYN \/ ACK flood attacks, packet fragmentation, etc., you need equipment or software systems for detecting and blocking such attacks.<br \/>\nSuch equipment is manufactured by many (Arbor, there are solutions from Cisco, Huawei, software implementations from Wanguard, etc.), many backbone operators have already installed it and offer DDoS protection services (I know about installations at Rostelecom, Megafon, TTK, MTS, essentially all major providers; hosters with their own a-la OVH.com, Hetzner.de protection do the same, I've personally encountered protection at ihor.ru). Some companies develop their software solutions (technologies like DPDK allow processing traffic at tens of gigabits on a single physical x86 machine).<\/p>\n<p>Bland k\u00e4nda akt\u00f6rer kan n\u00e4stan alla effektivt hantera L3\/L4 DDoS-attacker. Jag kan inte s\u00e4ga vem som har den st\u00f6rsta kanalens kapacitet (det \u00e4r insiderinformation), men vanligtvis \u00e4r det inte s\u00e5 viktigt, och skillnaden ligger bara i hur snabbt skyddet aktiveras (omedelbart eller efter n\u00e5gra minuters driftstopp f\u00f6r projektet, som hos Hetzner).<br \/>\nFr\u00e5gan \u00e4r hur kvalitativt detta g\u00f6rs: en f\u00f6rst\u00e4rkningsattack kan avvisas genom att blockera trafik fr\u00e5n l\u00e4nder med h\u00f6gst m\u00e4ngd skadlig trafik, eller s\u00e5 kan man bara avvisa den egentliga \u00f6verfl\u00f6diga trafiken.<br \/>\nMen baserat p\u00e5 min erfarenhet hanterar alla seri\u00f6sa akt\u00f6rer p\u00e5 marknaden detta utan problem: Qrator, DDoS-Guard, Kaspersky, G-Core Labs (tidigare SkyParkCDN), ServicePipe, Stormwall, Voxility, etc.<br \/>\nJag har inte st\u00f6tt p\u00e5 skydd fr\u00e5n operat\u00f6rer som Rostelecom, MegaFon, TTK, Beeline, men enligt kollegors recensioner erbjuder de dessa tj\u00e4nster p\u00e5 en tillr\u00e4ckligt h\u00f6g niv\u00e5, \u00e4ven om bristen p\u00e5 erfarenhet ibland g\u00f6r sig p\u00e5mind: ibland beh\u00f6ver man tweaka n\u00e5got via supporten f\u00f6r s\u00e4kerhetsoperat\u00f6ren.<br \/>\nVissa operat\u00f6rer erbjuder en separat tj\u00e4nst f\u00f6r \"skydd mot attacker p\u00e5 L3\/L4-niv\u00e5\", eller \"kanalskydd\", som kostar mycket mindre \u00e4n skydd p\u00e5 alla niv\u00e5er.<\/p>\n<p><b class=\"spoiler_title\">Men hur avvisar icke-huvudleverant\u00f6rer attacker p\u00e5 hundratals Gbit, de har ju inga egna kanaler?<\/b>Skyddsoperat\u00f6ren kan ansluta till n\u00e5gon av de stora leverant\u00f6rerna och avvisa attacker \"p\u00e5 deras bekostnad\". Man m\u00e5ste betala f\u00f6r kanalen, men alla dessa hundratals Gbit kommer inte alltid att utnyttjas, det finns alternativ f\u00f6r att betydligt s\u00e4nka kostnaden f\u00f6r kanaler i det h\u00e4r fallet, s\u00e5 modellen f\u00f6rblir fungerande.<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/l0\/nv\/70\/l0nv70ydhaz69tiqttecs0ug1_w.png\"><img decoding=\"async\" alt=\"Vad \u00e4r vad och vem \u00e4r vem p\u00e5 marknaden f\u00f6r DDoS-skydd\" src=\"\/wp-content\/uploads\/2019\/04\/795ec832a500ceda40b72b7a9e27976a.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><br \/>\n<i>S\u00e5dana rapporter fr\u00e5n \u00f6verordnad L3\/L4-skydd fick jag regelbundet, medan jag st\u00f6dde system hos hostingleverant\u00f6ren.<\/i><\/p>\n<h4>Skydd p\u00e5 L7-niv\u00e5 (applikationsniv\u00e5)<\/h4>\n<p>Attacker p\u00e5 L7-niv\u00e5 (applikationsniv\u00e5) kan stabilt och kvalitativt avvisas av n\u00e5gra f\u00e5 akt\u00f6rer.<br \/>\nJag har en verklig och ganska stor erfarenhet av<br \/>\n \u2014 Qrator.net;<br \/>\n \u2014 DDoS-Guard;<br \/>\n \u2014 G-Core Labs;<br \/>\n \u2014 Kaspersky.<\/p>\n<p>De tar betalt f\u00f6r varje megabit ren trafik, en megabit kostar cirka flera tusen rubel. Om du har \u00e5tminstone 100 megabit ren trafik \u2014 oj. Skyddet blir mycket dyrt. Jag kan ber\u00e4tta i kommande artiklar hur man designar applikationer f\u00f6r att spara mycket p\u00e5 kapaciteten av skyddskanaler.<br \/>\nDen verkliga \"kungen av berget\" \u00e4r Qrator.net, medan de andra ligger l\u00e5ngt efter. Qrator \u00e4r hittills de enda i min erfarenhet som erbjuder en n\u00e4stan nollandel av falska positiva, men de \u00e4r flera g\u00e5nger dyrare \u00e4n andra akt\u00f6rer p\u00e5 marknaden.<\/p>\n<p>Andra operat\u00f6rer erbjuder ocks\u00e5 h\u00f6gkvalitativ och stabil skydd. M\u00e5nga av tj\u00e4nsterna vi st\u00f6djer (inklusive mycket k\u00e4nda i landet!) \u00e4r skyddade av DDoS-Guard, G-Core Labs, och \u00e4r helt n\u00f6jda med resultaten.<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/95\/i0\/ap\/95i0api3gqlvnmwnk-3l8byibqq.png\"><img decoding=\"async\" alt=\"Vad \u00e4r vad och vem \u00e4r vem p\u00e5 marknaden f\u00f6r DDoS-skydd\" src=\"\/wp-content\/uploads\/2019\/04\/7d82c33c3859c08139104f9d4df2f04d.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><br \/>\n<i>Attacker blockerade av Qrator<\/i><\/p>\n<p>Det finns \u00e4ven erfarenhet med mindre skyddoperat\u00f6rer som cloud-shield.ru, ddosa.net och tusentals andra. Jag kan definitivt inte rekommendera dem eftersom min erfarenhet \u00e4r begr\u00e4nsad, men jag kan ber\u00e4tta om hur deras system fungerar. Priserna f\u00f6r deras skydd \u00e4r ofta 1-2 ordningar l\u00e4gre \u00e4n hos st\u00f6rre akt\u00f6rer. Vanligtvis k\u00f6per de en delvis skyddstj\u00e4nst (L3\/L4) fr\u00e5n n\u00e5gon av de st\u00f6rre akt\u00f6rerna + utvecklar sitt eget skydd mot attacker p\u00e5 h\u00f6gre niv\u00e5er. Detta kan vara helt effektivt + ni kan f\u00e5 en bra tj\u00e4nst till ett l\u00e4gre pris, men kom ih\u00e5g att de fortfarande \u00e4r sm\u00e5 f\u00f6retag med begr\u00e4nsad personalstyrka.<\/p>\n<h4>Vad \u00e4r sv\u00e5righeten med att avvisa attacker p\u00e5 L7-niv\u00e5?<\/h4>\n<p>Alla applikationer \u00e4r unika, och man m\u00e5ste till\u00e5ta anv\u00e4ndbar trafik f\u00f6r dem och blockera skadlig trafik. Det \u00e4r inte alltid m\u00f6jligt att enkelt filtrera bort bottar, s\u00e5 man m\u00e5ste anv\u00e4nda m\u00e5nga, verkligen M\u00c5NGA niv\u00e5er av trafikrening.<\/p>\n<p>Det r\u00e4ckte tidigare med modulen nginx-testcookie (<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/kyprizel\/testcookie-nginx-module\">https:\/\/github.com\/kyprizel\/testcookie-nginx-module<\/a><\/noindex>), och den r\u00e4cker fortfarande f\u00f6r att avvisa ett stort antal attacker. N\u00e4r jag jobbade inom hostingbranschen byggde jag L7-skyddet baserat p\u00e5 nginx-testcookie.<br \/>\nTyv\u00e4rr har attackerna blivit mer komplexa. testcookie anv\u00e4nder kontroller av bottar baserat p\u00e5 JS, och m\u00e5nga moderna bottar lyckas \u00f6vervinna dessa.<\/p>\n<p>Attackernas botn\u00e4t \u00e4r ocks\u00e5 unika, och man m\u00e5ste ta h\u00e4nsyn till varje st\u00f6rre botn\u00e4ts egenskaper.<br \/>\nAmplifiering, direkt fl\u00f6de fr\u00e5n ett botn\u00e4t, filtrering av trafik fr\u00e5n olika l\u00e4nder (olika filtrering f\u00f6r olika l\u00e4nder), SYN\/ACK-fl\u00f6de, paketfragmentering, ICMP, http-fl\u00f6de, samtidigt kan man p\u00e5 applikations-\/http-niv\u00e5 komma p\u00e5 ett obegr\u00e4nsat antal olika attacker.<br \/>\nSammanfattningsvis kan det p\u00e5 niv\u00e5 av kanal-, specialutrustning f\u00f6r trafikrening, speciell mjukvara och ytterligare filtreringsinst\u00e4llningar f\u00f6r varje kund finnas tiotals eller hundratals filtreringsniv\u00e5er.<br \/>\nF\u00f6r att hantera detta korrekt och justera filtreringsinst\u00e4llningarna f\u00f6r olika anv\u00e4ndare, kr\u00e4vs betydande erfarenhet och kvalificerad personal. \u00c4ven en stor operat\u00f6r som beslutar att erbjuda skyddstj\u00e4nster kan inte \"bara kasta pengar p\u00e5 problemet\": erfarenheten m\u00e5ste samlas genom att arbeta med liggande webbplatser och falska larm p\u00e5 legitim trafik.<br \/>\nF\u00f6r en skyddsoperat\u00f6r finns det ingen knapp f\u00f6r att \"avvisa DDoS\": det finns m\u00e5nga verktyg och man m\u00e5ste veta hur man anv\u00e4nder dem.<\/p>\n<p>Och ett sista bonus exempel.<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/ya\/wr\/mq\/yawrmqrp_xyx2o_nlg_hqeogl30.png\"><img decoding=\"async\" alt=\"Vad \u00e4r vad och vem \u00e4r vem p\u00e5 marknaden f\u00f6r DDoS-skydd\" src=\"\/wp-content\/uploads\/2019\/04\/545b53b7701bc8f06388bb5469e857f1.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><br \/>\n<i>Servern utan skydd st\u00e4ngdes av v\u00e4rden vid en attack p\u00e5 600 mbit.<\/i><br \/>\n<i>(\"F\u00f6rlusten\" av trafik m\u00e4rks inte eftersom endast 1 webbplats attackerades, den togs tempor\u00e4rt bort fr\u00e5n servern och blockeringen h\u00e4vdes inom en timme).<\/i><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/ty\/b_\/2b\/tyb_2baae8seawlsujllodb5kd0.png\"><img decoding=\"async\" alt=\"Vad \u00e4r vad och vem \u00e4r vem p\u00e5 marknaden f\u00f6r DDoS-skydd\" src=\"\/wp-content\/uploads\/2019\/04\/746502a8cb635a5ee097ef680fd24c0c.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><br \/>\n<i>Samma server med skydd. Angriparna \"gav upp\" efter ett dygn av avvisade attacker. Sj\u00e4lva attacken visade sig inte vara den starkaste.<\/i><\/p>\n<p>L3\/L4 attacker och skydd \u00e4r mer triviala, de beror huvudsakligen p\u00e5 kanalens tjocklek, detekteringsalgoritmer och filtrering av attacker.<br \/>\nL7-attacker \u00e4r sv\u00e5rare och mer originella, de beror p\u00e5 det attackerade programmet samt angriparnas f\u00f6rm\u00e5gor och fantasi. Skydd mot dem kr\u00e4ver stor kunskap och erfarenhet, och resultatet kan vara os\u00e4kert och inte direkt. Tills Google uppfinner \u00e4nnu ett AI-system f\u00f6r skydd.<br \/>\n<br \/>K\u00e4lla: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/southbridge\/blog\/450092\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u00ab\u041c\u0430\u043b\u044c\u0447\u0438\u043a, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0434\u0435\u043b\u0430\u043b \u043d\u0430\u043c \u0441\u0430\u0439\u0442, \u0443\u0436\u0435 \u043d\u0430\u0441\u0442\u0440\u043e\u0438\u043b \u0437\u0430\u0449\u0438\u0442\u0443 \u043e\u0442 DDoS\u00bb. \u00ab\u0423 \u043d\u0430\u0441 \u0436\u0435 \u0441\u0442\u043e\u0438\u0442 \u0437\u0430\u0449\u0438\u0442\u0430 \u043e\u0442 DDoS, \u043f\u043e\u0447\u0435\u043c\u0443 \u0441\u0430\u0439\u0442 \u043b\u0435\u0433?\u00bb \u00ab\u0421\u043a\u043e\u043b\u044c\u043a\u043e-\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0442\u044b\u0441\u044f\u0447 \u0445\u043e\u0447\u0435\u0442 Qrator?\u00bb \u0427\u0442\u043e\u0431\u044b \u043d\u043e\u0440\u043c\u0430\u043b\u044c\u043d\u043e \u043e\u0442\u0432\u0435\u0447\u0430\u0442\u044c \u043d\u0430 \u0442\u0430\u043a\u0438\u0435 \u0432\u043e\u043f\u0440\u043e\u0441\u044b \u0437\u0430\u043a\u0430\u0437\u0447\u0438\u043a\u0430\/\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u0438\u043a\u0430, \u043d\u0435\u043f\u043b\u043e\u0445\u043e \u0431\u044b \u0437\u043d\u0430\u0442\u044c, \u0447\u0442\u043e \u0441\u043a\u0440\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u0437\u0430 \u043d\u0430\u0437\u0432\u0430\u043d\u0438\u0435\u043c \u00ab\u0437\u0430\u0449\u0438\u0442\u0430 \u043e\u0442 DDoS\u00bb. \u0412\u044b\u0431\u043e\u0440 \u0441\u0435\u0440\u0432\u0438\u0441\u043e\u0432 \u0437\u0430\u0449\u0438\u0442\u044b \u0431\u043e\u043b\u044c\u0448\u0435 \u043d\u0430\u043f\u043e\u043c\u0438\u043d\u0430\u0435\u0442 \u0432\u044b\u0431\u043e\u0440 \u043b\u0435\u043a\u0430\u0440\u0441\u0442\u0432\u0430 \u0432\u0440\u0430\u0447\u043e\u043c, 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