{"id":37675,"date":"2019-10-31T22:18:59","date_gmt":"2019-10-31T19:18:59","guid":{"rendered":"https:\/\/prohoster.info\/blog\/opublikovan-dhcp-server-kea-1-6-razvivaemyj-konsortsiumom-isc\/"},"modified":"2019-10-31T22:18:59","modified_gmt":"2019-10-31T19:18:59","slug":"opublikovan-dhcp-server-kea-1-6-razvivaemyj-konsortsiumom-isc","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/opublikovan-dhcp-server-kea-1-6-razvivaemyj-konsortsiumom-isc","title":{"rendered":"Megjelent a Kea 1.6 DHCP-verw\u00e1ltoz\u00e1sa az ISC konzorcium fejleszt\u00e9s\u00e9ben","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>ISC Konzorcium <noindex><a rel=\"nofollow\" href=\"https:\/\/www.isc.org\/blogs\/kea-1-6\/\">k\u00f6zz\u00e9tett<\/a><\/noindex> DHCP-szerver kiad\u00e1s <noindex><a rel=\"nofollow\" href=\"http:\/\/kea.isc.org\">Kea 1.6.0<\/a><\/noindex>, amely a klasszikus ISC DHCP-t v\u00e1ltja fel. A projekt forr\u00e1sk\u00f3dja <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/isc-projects\/kea\">szabadon terjeszthet\u0151k<\/a><\/noindex> licenc alatt <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=32726\">Mozilla Nyilv\u00e1nos Licenc (MPL) 2.0<\/a><\/noindex>, a kor\u00e1bban az ISC DHCP-hez haszn\u00e1lt ISC Licenc helyett. <\/p>\n<p>A Kea DHCP-szerver a BIND 10 technol\u00f3gi\u00e1kra alapozva <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=36235\">\u00e9p\u00fclt<\/a><\/noindex> modul\u00e1ris architekt\u00far\u00e1val, amely lehet\u0151v\u00e9 teszi a funkcionalit\u00e1s k\u00fcl\u00f6nb\u00f6z\u0151 feldolgoz\u00f3kra val\u00f3 bont\u00e1s\u00e1t. A term\u00e9k egy teljes k\u00f6r\u0171 DHCP-szerver megval\u00f3s\u00edt\u00e1s\u00e1t tartalmazza, amely t\u00e1mogatja a DHCPv4 \u00e9s DHCPv6 protokollokat, \u00e9s k\u00e9pes helyettes\u00edteni az ISC DHCP-t. A Ke\u00e1ba be\u00e9p\u00edtettek dinamikus DNS-z\u00f3n\u00e1k friss\u00edt\u00e9s\u00e9re szolg\u00e1l\u00f3 eszk\u00f6z\u00f6ket, t\u00e1mogatja a szerverkeres\u00e9si, c\u00edmkioszt\u00e1si, friss\u00edt\u00e9si \u00e9s \u00fajracsatlakoz\u00e1si mechanizmusokat, az inform\u00e1ci\u00f3s lek\u00e9rdez\u00e9sek kezel\u00e9s\u00e9t, a hosztok c\u00edmfoglal\u00e1s\u00e1nak biztos\u00edt\u00e1s\u00e1t \u00e9s a PXE-ind\u00edt\u00e1st. A DHCPv6 megval\u00f3s\u00edt\u00e1s\u00e1n\u00e1l emellett el\u0151ny\u00f6ket biztos\u00edt a prefixek deleg\u00e1l\u00e1s\u00e1ra. K\u00fcls\u0151 alkalmaz\u00e1sokkal val\u00f3 interakci\u00f3hoz speci\u00e1lis API \u00e1ll rendelkez\u00e9sre. A konfigur\u00e1ci\u00f3 \u00e9l\u0151 friss\u00edt\u00e9se lehets\u00e9ges a szerver \u00fajraind\u00edt\u00e1sa n\u00e9lk\u00fcl.<\/p>\n<p>Az \u00fcgyfelek dedik\u00e1lt c\u00edmeivel \u00e9s param\u00e9tereivel kapcsolatos inform\u00e1ci\u00f3k k\u00fcl\u00f6nf\u00e9le t\u00e1rol\u00e1si t\u00edpusokban t\u00e1rolhat\u00f3k \u2014 jelenleg CSV f\u00e1jlok, MySQL adatb\u00e1zis, Apache Cassandra \u00e9s PostgreSQL h\u00e1tt\u00e9rt\u00e1rol\u00e1si lehet\u0151s\u00e9gek \u00e1llnak rendelkez\u00e9sre. A hosztok fenntart\u00e1si param\u00e9terei JSON form\u00e1tumban konfigur\u00e1ci\u00f3s f\u00e1jlban vagy MySQL \u00e9s PostgreSQL t\u00e1bl\u00e1zatban adhat\u00f3ak meg. A csomag tartalmaz egy perfdhcp eszk\u00f6zt a DHCP szerver teljes\u00edtm\u00e9ny\u00e9nek m\u00e9r\u00e9s\u00e9re, valamint statisztikai gy\u0171jt\u0151 komponenseket. A Kea kedvez\u0151 teljes\u00edtm\u00e9nyt mutat, p\u00e9ld\u00e1ul MySQL h\u00e1tt\u00e9r haszn\u00e1lat\u00e1val a szerver m\u00e1sodpercenk\u00e9nt 1000 c\u00edmkioszt\u00e1st v\u00e9gez (kb. 4000 csomag m\u00e1sodpercenk\u00e9nt), m\u00edg a memfile h\u00e1tt\u00e9r haszn\u00e1latakor a teljes\u00edtm\u00e9ny el\u00e9ri a m\u00e1sodpercenk\u00e9nt 7500 c\u00edmkioszt\u00e1st.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"http:\/\/bind10.isc.org\/raw-attachment\/wiki\/DesignDiagrams\/Overview-DHCP-2013-01-16.png\"><img decoding=\"async\" alt=\"Megjelent a Kea 1.6 DHCP-verw\u00e1ltoz\u00e1sa az ISC konzorcium fejleszt\u00e9s\u00e9ben \" src=\"\/wp-content\/uploads\/2019\/09\/506faa6784a89a80eb89611b1cc11a24.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Kulcsok <noindex><a rel=\"nofollow\" href=\"https:\/\/ftp.isc.org\/isc\/kea\/1.6.0\/Kea160ReleaseNotes.txt\">fejleszt\u00e9sek<\/a><\/noindex> a Kea 1.6-ban:<\/p>\n<ul>\n<li class=\"l\"> Megval\u00f3sult a h\u00e1tt\u00e9rkonfigur\u00e1ci\u00f3 (CB, Configuration Backend), amely lehet\u0151v\u00e9 teszi t\u00f6bb DHCPv4 \u00e9s DHCPv6 szerver be\u00e1ll\u00edt\u00e1sainak k\u00f6zpontos\u00edtott kezel\u00e9s\u00e9t. A h\u00e1tt\u00e9r haszn\u00e1lhat\u00f3 a Kea legt\u00f6bb be\u00e1ll\u00edt\u00e1s\u00e1nak t\u00e1rol\u00e1s\u00e1ra, bele\u00e9rtve a glob\u00e1lis param\u00e9tereket, a k\u00f6z\u00f6s h\u00e1l\u00f3zatok, alh\u00e1l\u00f3zatok, opci\u00f3k, tartalmok \u00e9s a param\u00e9terek meghat\u00e1roz\u00e1s\u00e1t. Ahelyett, hogy ezeket a be\u00e1ll\u00edt\u00e1sokat helyi konfigur\u00e1ci\u00f3s f\u00e1jlban t\u00e1roln\u00e1k, most egy k\u00fcls\u0151 adatb\u00e1zisban helyezhet\u0151k el. Ezzel lehet\u0151s\u00e9g van arra, hogy a CB-n kereszt\u00fcl ne minden, hanem csak a be\u00e1ll\u00edt\u00e1sok egy r\u00e9sze legyen meghat\u00e1rozva, a k\u00fcls\u0151 adatb\u00e1zisb\u00f3l \u00e9s a helyi konfigur\u00e1ci\u00f3s f\u00e1jlokb\u00f3l sz\u00e1rmaz\u00f3 param\u00e9terek \u00e1tfed\u00e9s\u00e9vel (p\u00e9ld\u00e1ul a helyi f\u00e1jlokban a h\u00e1l\u00f3zati interf\u00e9szek be\u00e1ll\u00edt\u00e1sait hagyhatj\u00e1k).\n<p>A konfigur\u00e1ci\u00f3 t\u00e1rol\u00e1s\u00e1ra haszn\u00e1lt DBMS-b\u0151l jelenleg csak a MySQL t\u00e1mogatott (a c\u00edmkioszt\u00e1s (leases) t\u00e1rol\u00e1s\u00e1ra MySQL, PostgreSQL \u00e9s Cassandra haszn\u00e1lhat\u00f3, m\u00edg a hosztok fenntart\u00e1s\u00e1hoz MySQL \u00e9s PostgreSQL alkalmazhat\u00f3). A DB-ben l\u00e9v\u0151 konfigur\u00e1ci\u00f3 k\u00f6zvetlen\u00fcl a DBMS-hez val\u00f3 hozz\u00e1f\u00e9r\u00e9ssel \u00e9s speci\u00e1lis el\u0151k\u00e9sz\u00edtett k\u00f6ztes k\u00f6nyvt\u00e1rak r\u00e9v\u00e9n v\u00e1ltoztathat\u00f3, amelyek egy tipikus parancsk\u00e9szletet k\u00edn\u00e1lnak a konfigur\u00e1ci\u00f3 kezel\u00e9s\u00e9re, p\u00e9ld\u00e1ul param\u00e9terek hozz\u00e1ad\u00e1s\u00e1ra \u00e9s elt\u00e1vol\u00edt\u00e1s\u00e1ra, hozz\u00e1rendel\u00e9sekre, DHCP-opci\u00f3kra \u00e9s alh\u00e1l\u00f3zatokra;<\/p>\n<li class=\"l\"> \u00daj DROP oszt\u00e1ly\u00fa feldolgoz\u00f3k ker\u00fcltek hozz\u00e1ad\u00e1sra (az \u00f6sszes DROP oszt\u00e1lyhoz tartoz\u00f3 csomag azonnal eldob\u00e1sra ker\u00fcl), amelyet nemk\u00edv\u00e1natos forgalom, p\u00e9ld\u00e1ul bizonyos t\u00edpus\u00fa DHCP \u00fczenetek eldob\u00e1s\u00e1ra lehet haszn\u00e1lni;\n<li class=\"l\"> \u00daj max-lease-time \u00e9s min-lease-time param\u00e9terek ker\u00fcltek hozz\u00e1ad\u00e1sra, amelyek lehet\u0151v\u00e9 teszik a c\u00edmhozz\u00e1rendel\u00e9s (lease) \u00e9lettartam\u00e1nak meghat\u00e1roz\u00e1s\u00e1t nem r\u00f6gz\u00edtett \u00e9rt\u00e9k form\u00e1j\u00e1ban, hanem megengedett tartom\u00e1nyk\u00e9nt;\n<li class=\"l\"> Javult a nem teljesen szabv\u00e1nyos DHCP eszk\u00f6z\u00f6kkel val\u00f3 kompatibilit\u00e1s. A probl\u00e9m\u00e1k elker\u00fcl\u00e9se \u00e9rdek\u00e9ben a Kea most a DHCPv4 \u00fczenetek t\u00edpus\u00e1r\u00f3l sz\u00f3l\u00f3 inform\u00e1ci\u00f3t az opci\u00f3k list\u00e1j\u00e1nak elej\u00e9n k\u00fcldi el, kezeli a hosztn\u00e9v k\u00fcl\u00f6nb\u00f6z\u0151 k\u00e9pviseleteit, felismeri az \u00fcres hosztn\u00e9v \u00e1tvitel\u00e9t, \u00e9s lehet\u0151v\u00e9 teszi a 0-t\u00f3l 255-ig terjed\u0151 k\u00f3dokkal rendelkez\u0151 szubopci\u00f3k meghat\u00e1roz\u00e1s\u00e1t;\n<li class=\"l\"> A DDNS d\u00e9monhoz k\u00fcl\u00f6n vez\u00e9rl\u0151 socket ker\u00fclt hozz\u00e1ad\u00e1sra, amelyen kereszt\u00fcl k\u00f6zvetlen\u00fcl parancsokat lehet k\u00f6zvet\u00edteni \u00e9s v\u00e1ltoz\u00e1sokat lehet v\u00e9grehajtani a konfigur\u00e1ci\u00f3n. A k\u00f6vetkez\u0151 parancsok t\u00e1mogatottak: build-report, config-get, config-reload, config-set, config-test, config-write, list-commands, shutdown \u00e9s version-get;\n<li class=\"l\"> Jav\u00edtva <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/08\/29\/\">sebezhet\u0151s\u00e9gek<\/a><\/noindex> (CVE-2019-6472, CVE-2019-6473, CVE-2019-6474), amelyek haszn\u00e1lhat\u00f3k szolg\u00e1ltat\u00e1smegtagad\u00e1sos t\u00e1mad\u00e1sok v\u00e9grehajt\u00e1s\u00e1ra (a DHCPv4 \u00e9s DHCPv6 szerverfeldolgoz\u00f3k \u00f6sszeoml\u00e1s\u00e1nak kiv\u00e1lt\u00e1s\u00e1ra) hib\u00e1s opci\u00f3kkal \u00e9s \u00e9rt\u00e9kekkel \u00e9rkez\u0151 k\u00e9r\u00e9sek k\u00fcld\u00e9s\u00e9vel. A legnagyobb vesz\u00e9lyt a probl\u00e9ma jelenti <noindex><a rel=\"nofollow\" href=\"https:\/\/kb.isc.org\/docs\/cve-2019-6474\">CVE-2019-6474<\/a><\/noindex>, amely a memfile t\u00e1rol\u00e1s\u00e1nak k\u00f6t\u00e9s\u00e9re haszn\u00e1lva a szerverfolyamat \u00f6n\u00e1ll\u00f3 \u00fajraind\u00edt\u00e1s\u00e1nak lehetetlens\u00e9g\u00e9hez vezet, \u00edgy a m\u0171k\u00f6d\u00e9s helyre\u00e1ll\u00edt\u00e1s\u00e1hoz adminisztr\u00e1tori k\u00e9zi beavatkoz\u00e1s sz\u00fcks\u00e9ges (a k\u00f6t\u00e9sek adatb\u00e1zis\u00e1nak tiszt\u00edt\u00e1sa).\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51393\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043d\u0441\u043e\u0440\u0446\u0438\u0443\u043c ISC \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0440\u0435\u043b\u0438\u0437 DHCP-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 Kea 1.6.0, \u0438\u0434\u0443\u0449\u0435\u0433\u043e \u043d\u0430 \u0441\u043c\u0435\u043d\u0443 \u043a\u043b\u0430\u0441\u0441\u0438\u0447\u0435\u0441\u043a\u043e\u043c\u0443 ISC DHCP. \u0418\u0441\u0445\u043e\u0434\u043d\u044b\u0435 \u0442\u0435\u043a\u0441\u0442\u044b \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u044e\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 Mozilla Public License (MPL) 2.0, \u0432\u043c\u0435\u0441\u0442\u043e \u0440\u0430\u043d\u0435\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u0439 \u0434\u043b\u044f ISC DHCP \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0438 ISC License. DHCP-\u0441\u0435\u0440\u0432\u0435\u0440 Kea \u043e\u0441\u043d\u043e\u0432\u0430\u043d \u043d\u0430 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u044f\u0445 BIND 10 \u0438 \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u043c\u043e\u0434\u0443\u043b\u044c\u043d\u043e\u0439 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u044b, \u043f\u043e\u0434\u0440\u0430\u0437\u0443\u043c\u0435\u0432\u0430\u044e\u0449\u0435\u0439 \u0440\u0430\u0437\u0431\u0438\u0435\u043d\u0438\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u043d\u0430 \u0440\u0430\u0437\u043d\u044b\u0435 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u044b-\u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438. \u041f\u0440\u043e\u0434\u0443\u043a\u0442 \u0432\u043a\u043b\u044e\u0447\u0430\u0435\u0442 \u0432 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":28274,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-37675","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043e\u043d\u0441\u043e\u0440\u0446\u0438\u0443\u043c ISC \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0440\u0435\u043b\u0438\u0437 DHCP-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 Kea 1.6.0, \u0438\u0434\u0443\u0449\u0435\u0433\u043e.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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