{"id":846,"date":"2018-07-19T11:13:00","date_gmt":"2018-07-19T09:13:00","guid":{"rendered":"https:\/\/support.versa.host\/?p=846"},"modified":"2026-05-28T22:10:51","modified_gmt":"2026-05-28T20:10:51","slug":"dnssec-azaz-a-biztonsagos-nevszerver","status":"publish","type":"post","link":"https:\/\/versa.host\/hu\/blog\/dnssec-azaz-a-biztonsagos-nevszerver\/","title":{"rendered":"DNSSEC, azaz a biztons\u00e1gos n\u00e9vszerver"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

Legut\u00f3bb a ModSecurity webalkalmaz\u00e1s szint\u0171 t\u0171zfalr\u00f3l \u00edrtunk, most is maradunk a biztons\u00e1gi vonalon, csak most a DNS v\u00e9delm\u00e9r\u0151l, azaz a DNSSEC-r\u0151l \u00edrunk. \u00c9rdemes ismerkedni vele \u00e9s gondolkozni a haszn\u00e1lat\u00e1n. Jelenleg alig-alig akad olyan \u00fcgyfel\u00fcnk, aki haszn\u00e1ln\u00e1, pedig hasznos kis dolog ez. L\u00e1ssuk, mir\u0151l is sz\u00f3l.<\/p>\n\n\n\n

A HUREG, azaz a .hu domaineket kezel\u0151 szerv, az Internet Szolg\u00e1ltat\u00f3k Tan\u00e1csa (ISZT) k\u00f6zel 50 oldalas kiadv\u00e1nyban foglalkozik a DNSSEC elv\u00e9r\u0151l \u00e9s konfigur\u00e1ci\u00f3j\u00e1r\u00f3l, de mi enn\u00e9l j\u00f3val r\u00f6videbben szeretn\u00e9nk tolm\u00e1csolni.<\/p>\n\n\n\n

A DNSSEC egy r\u00f6vid\u00edt\u00e9s, a teljes neve ez: Domain Name System Security Extensions. Nagyon leegyszer\u0171s\u00edtve olyasmi megold\u00e1s ez, mint a honlapokn\u00e1l az SSL tan\u00fas\u00edtv\u00e1ny be\u00e1ll\u00edt\u00e1sa \u00e9s a HTTPS haszn\u00e1lata, ahol a kommunik\u00e1ci\u00f3ban egy hiteles\u00edtett v\u00e1laszokat ad\u00f3 biztons\u00e1gi r\u00e9teg jelenik meg. Csakhogy a mindez egy nem biztons\u00e1gos protokollra, a DNS-re \u00e9p\u00fcl.<\/p>\n\n\n\n

De mi is az a DNS?<\/h4>\n\n\n\n

A meg\u00e9rt\u00e9shez kezdj\u00fck az eg\u00e9szet az alapokt\u00f3l. A DNS teljes neve a Domain Name System. A DNS z\u00f3n\u00e1ja t\u00e1rolja le a weboldalakhoz tartoz\u00f3 domain c\u00edm \u00f6sszes rekordj\u00e1t, adat\u00e1t \u00e9s sz\u00e1m alap\u00fa internetes c\u00edmekre ford\u00edtja azokat, azaz IP c\u00edmekre. Olyan ez, mint egy telefonk\u00f6nyv, csak nem sz\u00e1mokat kell a fej\u00fcnkben t\u00e1rolni, hanem neveket kell beg\u00e9pelni, \u00e9s a DNS a k\u00f6zpont, ami kapcsol. Ezek speci\u00e1lis szervereken futnak, az \u00fagynevezett doman n\u00e9v szervereken, amik ezeket a n\u00e9vb\u0151l sz\u00e1m ford\u00edt\u00e1sokat elv\u00e9gzik, s egyszer csak bet\u00f6lt a honlap.<\/p>\n\n\n\n

A DNS azonban a kezdetek \u00f3ta hib\u00e1dzik, mert nem siker\u00fclt t\u00fal biztons\u00e1goss\u00e1 tenni, \u00e9s folyamatosan fedeznek fel benne sebezhet\u0151s\u00e9geket. Ennek orvosl\u00e1s\u00e1ra alakult ki a DNSSEC b\u0151v\u00edtm\u00e9ny, amit hozz\u00e1 lehet adni a m\u00e1r megl\u00e9v\u0151 DNS protokollhoz, amely megval\u00f3s\u00edtja azt a biztons\u00e1gi r\u00e9teget, ami a HTTPS-es p\u00e9ld\u00e1hoz hasonl\u00edt, mindezt titkos\u00edt\u00e1st n\u00e9lk\u00fcl oldja meg, be\u00e9p\u00fclve az honlapok interneten kereszt\u00fcl t\u00f6rt\u00e9n\u0151 el\u00e9r\u00e9s\u00e9nek folyamat\u00e1ba.<\/p>\n\n\n\n

A DNSSEC m\u0171k\u00f6d\u00e9s\u00e9r\u0151l<\/h4>\n\n\n\n

Az elj\u00e1r\u00e1s c\u00e9lja, hogy megv\u00e9dje az internetez\u0151ket a DNS adatok meghamis\u00edt\u00e1s\u00e1t\u00f3l \u00fagy, hogy az adatokba \u00e1gyazott digit\u00e1lis al\u00e1\u00edr\u00e1ssal igazolja azokat. Azaz amikor beg\u00e9pel\u00fcnk egy domain c\u00edmet, akkor a digit\u00e1lis al\u00e1\u00edr\u00e1s hiteles\u00edt\u00e9sre ker\u00fcl. Ha ez az al\u00e1\u00edr\u00e1s megegyezik azzal, amit elhelyezt\u00fcnk a master DNS szerveren, akkor az adatok eljuthatnak a l\u00e1togat\u00f3 sz\u00e1m\u00edt\u00f3g\u00e9phez, \u00edgy a honlap bet\u00f6lt\u0151dik. A DNSSEC \u00edgy azt biztos\u00edtja, hogy t\u00e9nyleg csak azzal a honlappal t\u00f6rt\u00e9njen kommunik\u00e1ci\u00f3, melyet a l\u00e1togat\u00f3 val\u00f3ban meg akart nyitni.<\/p>\n\n\n\n

Az elj\u00e1r\u00e1s az adatok hiteles\u00edt\u00e9s\u00e9re nyilv\u00e1nos kulcsok \u00e9s digit\u00e1lis al\u00e1\u00edr\u00e1sok rendszer\u00e9t haszn\u00e1lja. Gyakorlatilag a m\u00e1r eddig is megl\u00e9v\u0151 DNS rekordok mell\u00e9 felvesz egy \u00faj rekordot. Ez az \u00faj rekord ugyanolyan m\u00f3don t\u00f6lthet\u0151k le, mint b\u00e1rmely m\u00e1s rekord, mint p\u00e9ld\u00e1ul az A, CNAME vagy MX rekordok. Az \u00faj rekordot al\u00e1\u00edr\u00e1sra haszn\u00e1ljuk. Egy al\u00e1\u00edrt n\u00e9vkiszolg\u00e1l\u00f3nak van egy nyilv\u00e1nos \u00e9s egy priv\u00e1t kulcsa minden z\u00f3n\u00e1hoz. Amikor az internetez\u0151 elind\u00edt egy lek\u00e9r\u00e9st, a priv\u00e1t kulccsal al\u00e1\u00edrt inform\u00e1ci\u00f3kat elk\u00fcldi, a fogad\u00f3 f\u00e9l pedig a nyilv\u00e1nos kulccsal feloldja. Ha ebbe az adatcser\u00e9be valaki k\u00e9retlen\u00fcl megpr\u00f3b\u00e1l megb\u00edzhatatlan, hamis\u00edtott inform\u00e1ci\u00f3kat k\u00fcldeni, akkor a nyilv\u00e1nos kulcs nem fogja megfelel\u0151en nyitni, \u00edgy a fogad\u00f3 f\u00e9l tudja, hogy az inform\u00e1ci\u00f3 hamis. Ilyen t\u00e1mad\u00e1sok lehetnek t\u00f6bbek k\u00f6z\u00f6tt a DNS cache poisoning \/ cache m\u00e9rgez\u00e9s, a hazug rekurz\u00edv n\u00e9vszerverek, DNS v\u00e1laszt hamis\u00edt\u00f3 routerek, de ezekre most nem t\u00e9r\u00fcnk ki.<\/p>\n\n\n\n

M\u00e9g egyszer ki kell hangs\u00falyozni, hogy ez NEM v\u00e1ltja ki az SSL-el HTTPS haszn\u00e1lat\u00e1t, mert nem tartalmaz a DNSSEC titkos\u00edt\u00f3 algoritmust. Csup\u00e1n azokat a kulcsokat biztos\u00edtja, melyek sz\u00fcks\u00e9gesek a DNS adatok eredetis\u00e9g\u00e9nek hiteles\u00edt\u00e9s\u00e9hez. V\u00e9delmet sem ny\u00fajt esetleges DDoS t\u00e1mad\u00e1sok ellen. Csak egy extra v\u00e9delem az adatcser\u00e9ben, az adatok hamis\u00edt\u00e1sa ellen.<\/p>\n\n\n\n

B\u0151vebb inform\u00e1ci\u00f3k \u00e9s egy\u00e9b magyar\u00e1zatok kit\u00e9rve technikai megval\u00f3s\u00edt\u00e1sokra algoritmusokra megtal\u00e1lhat\u00f3k a Wikipedi\u00e1n, itt: https:\/\/hu.wikipedia.org\/wiki\/Domain_Name_System_Security_Extensions<\/a><\/p>\n\n\n\n

Hogy n\u00e9z ki a DS rekord?<\/h4>\n\n\n\n

A DNSKEY-ben tal\u00e1lhat\u00f3 kulcsokat k\u00e9t k\u00fcl\u00f6nb\u00f6z\u0151 c\u00e9lra haszn\u00e1lj\u00e1k:<\/p>\n\n\n\n

      \u2022 Key Signing Key (KSK-kulcs al\u00e1\u00edr\u00f3 kulcs) feladata a z\u00f3na al\u00e1\u00edr\u00f3 kulcsok al\u00e1\u00edr\u00e1sa
      \u2022 Zone Signing Key, (ZSK-z\u00f3na al\u00e1\u00edr\u00f3 kulcs) ezzel az egyes rekordokat \u00edrj\u00e1k al\u00e1<\/p>\n\n\n\n

A DS (Delegation Signer) rekord nyilv\u00e1nos kulcs egy egyedi sz\u00e1l\u00e1t tartalmazza, valamint metaadatokat a kulcsr\u00f3l, p\u00e9ld\u00e1ul azt, hogy milyen algoritmusokat haszn\u00e1l.<\/p>\n\n\n\n

N\u00e9zz\u00fcnk egy p\u00e9ld\u00e1t:<\/strong><\/p>\n\n\n\n

ds:lelekserpa.hu 
DS          2371      13           2             D9692CA39EAB331CC845903F457DCA2A5F9DE474<\/p>\n\n\n\n

Bontsuk sz\u00e9t a k\u00fcl\u00f6nb\u00f6z\u0151 komponensekre a DS rekordot, \u00e9s n\u00e9zz\u00fck meg, mi micsoda:<\/p>\n\n\n\n

lelekserpa.hu  \u2013 ez maga a domain c\u00edm
DS \u2013 azaz a Delegation Signer rekord r\u00f6vid\u00edt\u00e9se, a rekord t\u00edpus\u00e1nak jele
2371 \u2013 Key Tag (azaz kulcsc\u00edmke) a kulcs azonos\u00edt\u00f3ja
13 \u2013 Az algoritmus t\u00edpusa
2 \u2013 A kivonat t\u00edpusa
D9692CA39EAB331CC845903F457DCA2A5F9DE474 – a nyilv\u00e1nos kulcs kivonata<\/p>\n\n\n\n

Ha mindent sikeresen be\u00e1ll\u00edtottunk, akkor m\u00e1r csak meg kell v\u00e1rni azt az id\u0151t (TTL-t), am\u00edg a DNS friss\u00edt \u00e9s az \u00faj rekord \u00e9rv\u00e9nybe l\u00e9p. Ekkor lehet bekapcsolni .hu domain eset\u00e9n az ISZT fel\u00fclet\u00e9n, majd lehet tesztelni. A mi teszt domain c\u00edm\u00fcnk eset\u00e9n az eredm\u00e9ny itt l\u00e1that\u00f3: https:\/\/dnssec-analyzer.verisignlabs.com\/lelekserpa.hu<\/a><\/p>\n\n\n\n

Kinek aj\u00e1nlott?<\/h4>\n\n\n\n

Mindenkinek, aki szeretn\u00e9 tov\u00e1bb fokozni a honlapj\u00e1nak \u00e9s annak l\u00e1togat\u00f3inak a v\u00e9delm\u00e9t \u00e9s ez\u00e1ltal tov\u00e1bb n\u00f6velni az adathal\u00e1szat \u00e9s az adathamis\u00edt\u00e1s esetleges lehet\u0151s\u00e9geit.<\/p>\n\n\n\n

Hogyan lehet bekapcsolni?<\/h4>\n\n\n\n

Ez egyel\u0151re csak egy ig\u00e9nyfelm\u00e9r\u00e9s.<\/strong><\/p>\n\n\n\n

Nem minden rendszer \u00e9s nem minden DNS szerver t\u00e1mogatja. A vCRM \u00dcgyf\u00e9lkapu m\u00f6g\u00f6tti MyDNS szerver nem t\u00e1mogatja, \u00edgy az cser\u00e9re szorul majd. A cPanel t\u00e1mogatja, de csak akkor, ha szerverenk\u00e9nt dedik\u00e1lt DNS rendszer van, n\u00e1lunk pedig clusterbe van szervezve, \u00edgy nem m\u0171k\u00f6dik. Van r\u00e1 a cPanel fel\u00e9 \u201efeature request\u201d, de nem tudni mikor lesz bel\u0151le valami.<\/p>\n\n\n\n

Nagyobb ig\u00e9ny eset\u00e9n azonban elkezd\u00fcnk dolgozni azon, hogy h\u00e1zon bel\u00fcl megoldjuk a DNSSEC t\u00e1mogat\u00e1s\u00e1t.<\/p>\n\n\n\n

Addig is a Cloudflare ingyenes csomagj\u00e1t javasoljuk erre a c\u00e9lra. A minta domain eset\u00e9n mi is ezt haszn\u00e1ltuk a DNSSEC bekapcsol\u00e1s\u00e1ra. De egy\u00e9b szolg\u00e1ltat\u00e1sok, mint p\u00e9ld\u00e1ul a CDN (Content Delivery Network) haszn\u00e1lata miatt is hamarosan k\u00fcl\u00f6n cikk v\u00e1rhat\u00f3 a Cloudflare haszn\u00e1lat\u00e1r\u00f3l.<\/p>\n","protected":false},"excerpt":{"rendered":"

Legut\u00f3bb a ModSecurity webalkalmaz\u00e1s szint\u0171 t\u0171zfalr\u00f3l \u00edrtunk, most is maradunk a biztons\u00e1gi vonalon, csak most a DNS v\u00e9delm\u00e9r\u0151l, azaz a DNSSEC-r\u0151l \u00edrunk. \u00c9rdemes ismerkedni vele \u00e9s gondolkozni a haszn\u00e1lat\u00e1n. Jelenleg alig-alig akad olyan \u00fcgyfel\u00fcnk, aki haszn\u00e1ln\u00e1, pedig hasznos kis dolog ez. L\u00e1ssuk, mir\u0151l is sz\u00f3l. A HUREG, azaz a .hu domaineket kezel\u0151 szerv, az Internet […]<\/p>\n","protected":false},"author":1,"featured_media":6266,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[192],"tags":[],"class_list":["post-846","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nDNSSEC, azaz a biztons\u00e1gos n\u00e9vszerver • Versanus<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"hu_HU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DNSSEC, azaz a biztons\u00e1gos n\u00e9vszerver\" \/>\n<meta property=\"og:description\" content=\"Legut\u00f3bb a ModSecurity webalkalmaz\u00e1s szint\u0171 t\u0171zfalr\u00f3l \u00edrtunk, most is maradunk a biztons\u00e1gi vonalon, csak most a DNS v\u00e9delm\u00e9r\u0151l, azaz a DNSSEC-r\u0151l \u00edrunk. \u00c9rdemes ismerkedni vele \u00e9s gondolkozni a haszn\u00e1lat\u00e1n. Jelenleg alig-alig akad olyan \u00fcgyfel\u00fcnk, aki haszn\u00e1ln\u00e1, pedig hasznos kis dolog ez. L\u00e1ssuk, mir\u0151l is sz\u00f3l. 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