{"id":4852,"date":"2014-01-20T11:33:06","date_gmt":"2014-01-20T10:33:06","guid":{"rendered":"http:\/\/blog.websupport.sk\/?p=4852"},"modified":"2025-03-11T21:06:22","modified_gmt":"2025-03-11T20:06:22","slug":"zbrojime-v-suboji-so-spamom","status":"publish","type":"post","link":"https:\/\/www.websupport.sk\/blog\/2014\/01\/zbrojime-v-suboji-so-spamom\/","title":{"rendered":"Zbroj\u00edme v s\u00faboji so spamom"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\"><b>Doba \u010d\u00edtania:<\/b><\/span> <span class=\"rt-time\"> 5<\/span> <span class=\"rt-label rt-postfix\">min.<\/span><\/span><p>Vo WebSupporte prijmeme aj po\u0161leme denne pribli\u017ene mili\u00f3n e-mailov\u00fdch spr\u00e1v. Odfiltrova\u0165 pri takejto prem\u00e1vke spamy si okrem st\u00e1lej pozornosti a mno\u017estva operat\u00edvy vy\u017eaduje aj svojsk\u00fa kombin\u00e1ciu vedy a umenia. V tomto blogu prezrad\u00edme nie\u010do o tom, ako sa teraz chr\u00e1nime pred spamom a \u010do v tejto oblasti chyst\u00e1me v bud\u00facnosti.<!--more--> <\/br><\/br><\/p>\n<p dir=\"ltr\">Prich\u00e1dzaj\u00facu po\u0161tu triedime najprv tak, \u017ee kontrolujeme, \u010di sa po\u0161tov\u00fd server odosielate\u013ea nach\u00e1dza na zozname odosielate\u013eov spamov. Pou\u017e\u00edvame na to viacero free slu\u017eieb a jednu platen\u00fa, s ktorou sme spokojn\u00ed (SpamHaus). Ke\u010f\u017ee sa na cudzie SMTP servery dotazujeme r\u00e1dovo nieko\u013eko desa\u0165tis\u00edckr\u00e1t denne, je pre n\u00e1s technicky v\u00fdhodn\u00e9 syncova\u0165 si datab\u00e1zu SpamHausu lok\u00e1lne. Niekedy sa na blacklisty dostan\u00fa aj prekvapivo legit\u00edmne servery, ned\u00e1vno napr\u00edklad stroj od gmail.com. Ak v\u00e1m teda neprich\u00e1dza z vybran\u00e9ho smeru po\u0161ta, toto m\u00f4\u017ee by\u0165 d\u00f4vod, ktor\u00fd my neovplyvn\u00edme. Na filtrovanie legit\u00edmnej po\u0161ty od spamov sme v minulosti pou\u017e\u00edvali open-sourcov\u00fd SpamAssassin, ale z\u00e1verom minul\u00e9ho roka sme pre\u0161li na komer\u010dn\u00e9 rie\u0161enie v r\u00e1mci technickej spolupr\u00e1ce s <a title=\"ESET\" href=\"http:\/\/www.eset.com\/sk\/\" target=\"_blank\">ESET<\/a>-om. Zlep\u0161ila sa n\u00e1m kvalita detekcie spamov a odbudla pr\u00e1ca s laden\u00edm, ale pri\u0161li sme o niektor\u00e9 mo\u017enosti kustomiz\u00e1cie pre pou\u017e\u00edvate\u013eov a tie\u017e o pocit, \u017ee vid\u00edme rie\u0161eniu \u201cpod kapotu\u201d. Prich\u00e1dzaj\u00face spamy automaticky nema\u017eeme, len ich ozna\u010d\u00edme na\u0161im pou\u017e\u00edvate\u013eom ako potenci\u00e1lny spam a zvy\u0161ok pr\u00e1ce prenech\u00e1vame nastaveniam a antispamov\u00fdm softv\u00e9rom na strane na\u0161ich z\u00e1kazn\u00edkov.<\/p>\n<p>\u010eal\u0161ou kontrolou pri prij\u00edman\u00ed e-mailu je kontrola SPF z\u00e1znamu dom\u00e9ny odosielate\u013ea. SPF z\u00e1znam, pokia\u013e existuje, definuje zoznam povolen\u00fdch mailserverov, z ktor\u00fdch m\u00f4\u017ee prich\u00e1dza\u0165 po\u0161ta, a ur\u010duje, \u010do sa m\u00e1 robi\u0165, ke\u010f pr\u00edde z in\u00e9ho mailservera. V pr\u00edpade, \u017ee SPF z\u00e1znam m\u00e1 nastaven\u00e9 natvrdo odmietnutie po\u0161ty z cudz\u00edch mailserverov, tak ju odmietneme. V pr\u00edpade, \u017ee po\u0161ta nie je odmietnut\u00e1, \u00a0prid\u00e1 sa len\u00a0hlavi\u010dka Received-SPF, ktor\u00fa je mo\u017en\u00e9 pou\u017ei\u0165 napr\u00edklad vo filtroch.<\/p>\n<p>&nbsp;<\/p>\n<p>Rie\u0161i\u0165 prich\u00e1dzaj\u00face spamy je pre n\u00e1s &#8211; prekvapivo &#8211; t\u00e1 \u013eah\u0161ia vec: n\u00e1\u0161 hlavn\u00fd probl\u00e9m je ochr\u00e1ni\u0165 si infra\u0161trukt\u00faru pred zneu\u017eit\u00edm na posielanie spamov smerom von do sveta. Najv\u00e4\u010d\u0161\u00ed technick\u00fd probl\u00e9m s odosielan\u00edm spamov von je ten, \u017ee sa potom dost\u00e1vame na blacklisty a v\u010faka tomu \u017eiadni na\u0161i z\u00e1kazn\u00edci nem\u00f4\u017eu doru\u010dova\u0165 e-maily na vybran\u00e9 destin\u00e1cie. Ke\u010f u\u017e sa dostaneme na blacklisty, rie\u0161enia b\u00fdvaj\u00fa zd\u013ahav\u00e9, lebo takmer \u017eiadny poskytovate\u013e nekomunikuje so svetom o tom, kedy, ako a za ak\u00fdch podmienok v\u00e1s z blacklistu odstr\u00e1ni. S\u00fa tak\u00ed ako Microsoft (hotmail.com, zoznam.sk, at\u010f.), ktor\u00ed aspo\u0148 cez osobitn\u00fa str\u00e1nku daj\u00fa k dispoz\u00edcii n\u00e1h\u013ead probl\u00e9mov\u00fdch e-mailov. To, \u017ee tam \u010dasto vid\u00edme \u00faplne legit\u00edmne e-maily na\u0161ich z\u00e1kazn\u00edkov, ozna\u010den\u00e9 ako spam, sved\u010d\u00ed o tom, \u017ee rozhodnutie o tom, \u010do je a \u010do nie je spam, je zlo\u017eit\u00fd, nielen technick\u00fd, ale aj pr\u00e1vny \u010di mor\u00e1lny probl\u00e9m.<\/p>\n<p>&nbsp;<\/p>\n<p>Najv\u00e4\u010d\u0161\u00edm zdrojom odch\u00e1dzaj\u00facich spamov s\u00fa napadnut\u00e9 a zneu\u017eit\u00e9 str\u00e1nky, e-mailov\u00e9 pr\u00edstupy a VPS servery na\u0161ich z\u00e1kazn\u00edkov. Ako poskytovate\u013e webhostingov\u00fdch a e-mailov\u00fdch slu\u017eieb nem\u00e1me takmer \u017eiadnu kontrolu nad t\u00fdm, ak\u00e9 str\u00e1nky hostujeme a kto si ak\u00fa po\u0161tu od n\u00e1s odosiela. Sna\u017e\u00edme sa weby na\u0161ich z\u00e1kazn\u00edkov chr\u00e1ni\u0165 plo\u0161ne pred \u00fatokom zvonka. V s\u00fa\u010dasnosti testujeme rie\u0161enie mod_security modulu do apache servera, je v\u0161ak obtia\u017ene pou\u017ei\u0165 jeho pokro\u010dil\u00e9 vlastnosti tak, aby sme neobmedzili funk\u010dnos\u0165 z\u00e1kazn\u00edckych webov.<\/p>\n<p>&nbsp;<\/p>\n<p>Z\u00e1kladnou ochranou pred spamom z webserverov je vy\u017eadova\u0165 od ka\u017ed\u00e9ho odch\u00e1dzaj\u00faceho e-mailu, aby mal legit\u00edmnu adresu odosielate\u013ea, ktor\u00e1 re\u00e1lne zodpoved\u00e1 po\u0161tovej schr\u00e1nke na na\u0161ich mailserveroch. Po tejto kontrole pos\u00favame e-maily antispam rie\u0161eniu nastaven\u00e9mu tak, aby neposielal \u010falej e-maily ozna\u010den\u00e9 len s vysokou istotou ako spam. Sofistikovanos\u0165 spamerov v tejto oblasti je ale neust\u00e1lym probl\u00e9mom. Aktu\u00e1lne sa n\u00e1m naj\u0165a\u017e\u0161ie rozpozn\u00e1vaj\u00fa kr\u00e1tke phisingov\u00e9 e-maily s \u00fatokmi na online banking syst\u00e9my v z\u00e1padnej Eur\u00f3pe, ale aj r\u00f4zne kr\u00e1tke a nekone\u010dne sa meniace \u201cnig\u00e9rijsk\u00e9\u201d listy. Na lep\u0161iu detekciu spamov sme ned\u00e1vno zaviedli syst\u00e9m takzvan\u00fdch \u201c<strong>honey-pot<\/strong>\u201d n\u00e1strah. Na na\u0161e vlastn\u00e9 str\u00e1nky prid\u00e1vame nevidite\u013en\u00e9 odkazy na umelo vytvoren\u00e9 po\u0161tov\u00e9 schr\u00e1nky. Tie sl\u00fa\u017eia ako n\u00e1strahy bottom spamerov: ak\u00e1ko\u013evek po\u0161ta, smeruj\u00faca do t\u00fdchto schr\u00e1nok, bude teda zaru\u010dene pokladan\u00e1 za spam a d\u00e1 sa n\u00e1sledne pou\u017ei\u0165 ako etal\u00f3n pri odli\u0161ovan\u00ed od legit\u00edmnej po\u0161ty. Tu by sme radi vyzvali na\u0161ich z\u00e1kazn\u00edkov a fan\u00fa\u0161ikov: ak ste ochotn\u00ed umiestni\u0165 si tak\u00fato nevidite\u013en\u00fa n\u00e1strahu spamerom aj na va\u0161u str\u00e1nku, ozvite sa mi.<\/p>\n<p>&nbsp;<\/p>\n<p>Ve\u013ek\u00fa rolu pri ochrane hraj\u00fa n\u00e1\u0161 monitoring a na\u0161a \u0161tatistika. Neust\u00e1le vyhodnocujeme po\u010dty odch\u00e1dzaj\u00facich spr\u00e1v pod\u013ea r\u00f4znych krit\u00e9ri\u00ed a h\u013ead\u00e1me anom\u00e1lie. Typick\u00fdm javom hacknut\u00e9ho webu z\u00e1kazn\u00edka, zneu\u017eit\u00e9ho na posielanie spamov, je jeho ne\u010dakane zv\u00fd\u0161en\u00e1 e-mailov\u00e1 aktivita, pri ktorej m\u00e1 relat\u00edvne n\u00edzke, ale predsa nejak\u00e9 percento e-mailov ozna\u010den\u00fdch ako spam. Z\u00e1sahy rob\u00edme zatia\u013e ru\u010dne a je to pomerne pr\u00e1cne, do bud\u00facnosti preto zva\u017eujeme syst\u00e9m, ktor\u00fd by jednak s\u00e1m rozpozn\u00e1val anom\u00e1lie v \u201ce-mailovom spr\u00e1van\u00ed\u201d na\u0161ich pou\u017e\u00edvate\u013eov a tie\u017e robil niektor\u00e9 typy ochrann\u00fdch opatren\u00ed automaticky.<\/p>\n<p>\u010casto sa tie\u017e st\u00e1va, \u017ee \u00fato\u010dn\u00edci napadn\u00fa dom\u00e1ci alebo firemn\u00fd po\u010d\u00edta\u010d n\u00e1\u0161ho pou\u017e\u00edvate\u013ea a stiahnu si prihlasovacie \u00fadaje na na\u0161e SMTP servery, ktor\u00e9 potom pou\u017eij\u00fa na rozosielanie spamov. V minulosti sta\u010dilo obmedzova\u0165 pr\u00edstupy na po\u0161tov\u00e9 servery pod\u013ea IP adresy pr\u00edslu\u0161nej krajiny. St\u00e1le \u010dastej\u0161ie v\u0161ak vid\u00edme, \u017ee ma\u0165 IP adresy zo Slovenska nie je probl\u00e9m ani pre spamerov z druh\u00e9ho konca zemegule. Sami sme \u010dasto ter\u010dom pon\u00fak r\u00f4znych priekupn\u00edkov, ktor\u00ed n\u00e1m pon\u00fakaj\u00fa IP adresy z hocijakej cudzej krajiny.<\/p>\n<p>&nbsp;<\/p>\n<p>Osobitnou kapitolou s\u00fa r\u00f4zne brute-force alebo DDoS \u00fatoky na na\u0161e samotn\u00e9 SMTP servery. Niekedy ani sami nech\u00e1peme zmysel toho, na\u010do \u00fato\u010dn\u00edk dookola opakuje ten ist\u00fd \u00fatok na na\u0161u e-mailov\u00fa infra\u0161trukt\u00faru, ak je ne\u00fa\u010dinn\u00fd. Ak aj \u00fatok ale nezafunguje, st\u00e1le je pre n\u00e1s ve\u013ek\u00fdm probl\u00e9mom, ak sa opakuje stovky r\u00e1z \u00a0za sekundu. Nie\u010do filtrujeme na inteligentn\u00fdch switchoch (Cisco 4500), nie\u010do hne\u010f modulom postscreen v postfixe, ale chceme to v\u0161etko e\u0161te vylep\u0161i\u0165. Zauj\u00edmav\u00fd n\u00e1pad je oznamova\u0165 svetu IP adresu mailserverov r\u00f4zne pod\u013ea toho, z akej krajiny prich\u00e1dza dotaz. Pre menej d\u00f4veryhodn\u00e9 krajiny chceme vy\u010dleni\u0165 samostatn\u00fa, ale funk\u010dn\u00fa SMTP infra\u0161trukt\u00faru, ktor\u00e1 by v pr\u00edpade pre\u0165a\u017eenia \u00fatokom obmedzila len prij\u00edmanie po\u0161ty z dan\u00fdch kraj\u00edn.<\/p>\n<p>To\u013eko stru\u010dne o na\u0161om boji so spamermi. Napriek v\u0161etk\u00fdm menovan\u00fdm technol\u00f3gi\u00e1m je to st\u00e1le dos\u0165 aj o manu\u00e1lnej pr\u00e1ci. Tu sa chceme najviac posun\u00fa\u0165 a h\u013eada\u0165 v bud\u00facnosti sp\u00f4soby, ako v\u00e4\u010d\u0161inu tejto pr\u00e1ce zautomatizova\u0165.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Vo WebSupporte prijmeme aj po\u0161leme denne pribli\u017ene mili\u00f3n e-mailov\u00fdch spr\u00e1v. Odfiltrova\u0165 pri takejto prem\u00e1vke spamy si okrem st\u00e1lej pozornosti a mno\u017estva operat\u00edvy vy\u017eaduje aj svojsk\u00fa kombin\u00e1ciu vedy a umenia. V tomto blogu prezrad\u00edme nie\u010do o tom, ako sa teraz chr\u00e1nime pred spamom a \u010do v tejto oblasti chyst\u00e1me v bud\u00facnosti.<\/p>\n","protected":false},"author":35,"featured_media":5585,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,7,11],"tags":[347,621,645,788,956],"class_list":["post-4852","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novinky","category-technologie","category-zakulisie","tag-honey-pot","tag-pajkus","tag-pikus","tag-spam","tag-websupport"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Zbroj\u00edme v s\u00faboji so spamom - Websupport blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.websupport.sk\/blog\/2014\/01\/zbrojime-v-suboji-so-spamom\/\" \/>\n<meta property=\"og:locale\" content=\"sk_SK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Zbroj\u00edme v s\u00faboji so spamom - Websupport blog\" \/>\n<meta property=\"og:description\" content=\"Vo WebSupporte prijmeme aj po\u0161leme denne pribli\u017ene mili\u00f3n e-mailov\u00fdch spr\u00e1v. 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