{"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\/cs\/blog\/news\/opublikovan-dhcp-server-kea-1-6-razvivaemyj-konsortsiumom-isc","title":{"rendered":"Byl vyd\u00e1n DHCP server Kea 1.6, vyv\u00edjen\u00fd konsorciem ISC","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Konsorcium ISC <noindex><a rel=\"nofollow\" href=\"https:\/\/www.isc.org\/blogs\/kea-1-6\/\">vydal<\/a><\/noindex> verzi DHCP serveru <noindex><a rel=\"nofollow\" href=\"http:\/\/kea.isc.org\">Kea 1.6.0<\/a><\/noindex>, kter\u00fd nahrazuje klasick\u00fd ISC DHCP. Zdrojov\u00e9 k\u00f3dy projektu <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/isc-projects\/kea\">se distribuj\u00ed<\/a><\/noindex> pod licenc\u00ed <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=32726\">Mozilla Public License (MPL) 2.0<\/a><\/noindex>, m\u00edsto d\u0159\u00edve pou\u017e\u00edvan\u00e9 licence ISC License pro ISC DHCP. <\/p>\n<p>DHCP server Kea je zalo\u017een na technologi\u00edch BIND 10 a <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=36235\">je postaven<\/a><\/noindex> s vyu\u017eit\u00edm modul\u00e1rn\u00ed architektury, kter\u00e1 umo\u017e\u0148uje rozd\u011blen\u00ed funkcionality na r\u016fzn\u00e9 procesy-zpracovatele. Produkt zahrnuje pln\u011b funk\u010dn\u00ed implementaci serveru s podporou protokol\u016f DHCPv4 a DHCPv6, kter\u00e1 m\u016f\u017ee nahradit ISC DHCP. Kea obsahuje prost\u0159edky pro dynamickou aktualizaci DNS z\u00f3n (Dynamic DNS), podporuje mechanismy pro objevov\u00e1n\u00ed server\u016f, p\u0159id\u011blov\u00e1n\u00ed adres, aktualizace a p\u0159ipojen\u00ed, zpracov\u00e1n\u00ed informa\u010dn\u00edch po\u017eadavk\u016f, rezervaci adres pro hosty a PXE zav\u00e1d\u011bn\u00ed. V implementaci DHCPv6 je nav\u00edc poskytov\u00e1na mo\u017enost delegace prefix\u016f. Pro interakci s extern\u00edmi aplikacemi je k dispozici speci\u00e1ln\u00ed API. Je mo\u017en\u00e9 prov\u00e1d\u011bt aktualizaci konfigurace za b\u011bhu bez restartov\u00e1n\u00ed serveru.<\/p>\n<p>Informace o p\u0159i\u0159azen\u00fdch adres\u00e1ch a parametrech klient\u016f mohou b\u00fdt ulo\u017eeny v r\u016fzn\u00fdch typech \u00falo\u017ei\u0161\u0165 \u2014 v sou\u010dasn\u00e9 dob\u011b jsou k dispozici backendy pro ukl\u00e1d\u00e1n\u00ed do CSV soubor\u016f, datab\u00e1ze MySQL, Apache Cassandra a PostgreSQL. Parametry rezervace hostitel\u016f mohou b\u00fdt ur\u010deny v konfigura\u010dn\u00edm souboru ve form\u00e1tu JSON nebo jako tabulka v MySQL a PostgreSQL. Sou\u010d\u00e1st\u00ed je n\u00e1stroj perfdhcp pro m\u011b\u0159en\u00ed v\u00fdkonu DHCP serveru a komponenty pro sb\u011br statistik. Kea vykazuje slu\u0161n\u00fd v\u00fdkon; nap\u0159\u00edklad p\u0159i pou\u017eit\u00ed backendu MySQL m\u016f\u017ee server prov\u00e9st 1000 p\u0159i\u0159azen\u00ed adres za sekundu (p\u0159ibli\u017en\u011b 4000 paket\u016f za sekundu) a p\u0159i pou\u017eit\u00ed backendu memfile dosahuje v\u00fdkonu 7500 p\u0159i\u0159azen\u00ed za sekundu.<\/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=\"Byl vyd\u00e1n DHCP server Kea 1.6, vyv\u00edjen\u00fd konsorciem ISC \" src=\"\/wp-content\/uploads\/2019\/09\/506faa6784a89a80eb89611b1cc11a24.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Kl\u00ed\u010dov\u00e9 <noindex><a rel=\"nofollow\" href=\"https:\/\/ftp.isc.org\/isc\/kea\/1.6.0\/Kea160ReleaseNotes.txt\">vylep\u0161en\u00ed<\/a><\/noindex> v Kea 1.6:<\/p>\n<ul>\n<li class=\"l\"> Byl implementov\u00e1n backend konfigurace (CB, Configuration Backend), kter\u00fd umo\u017e\u0148uje centralizovan\u00e9 \u0159\u00edzen\u00ed nastaven\u00ed n\u011bkolika server\u016f DHCPv4 a DHCPv6. Backend m\u016f\u017ee b\u00fdt pou\u017eit pro uchov\u00e1v\u00e1n\u00ed v\u011bt\u0161iny nastaven\u00ed Kea, v\u010detn\u011b glob\u00e1ln\u00edch parametr\u016f, informac\u00ed o spole\u010dn\u00fdch s\u00edt\u00edch, pods\u00edt\u00edch, mo\u017enostech, pulzech a definic\u00edch mo\u017enost\u00ed. M\u00edsto uchov\u00e1v\u00e1n\u00ed v\u0161ech t\u011bchto nastaven\u00ed v m\u00edstn\u00edm konfigura\u010dn\u00edm souboru mohou b\u00fdt nyn\u00ed um\u00edst\u011bna ve vn\u011bj\u0161\u00ed datab\u00e1zi. P\u0159i\u010dem\u017e je mo\u017en\u00e9 definovat prost\u0159ednictv\u00edm CB ne v\u0161echny, ale pouze \u010d\u00e1st nastaven\u00ed s p\u0159ekr\u00fdv\u00e1n\u00edm parametr\u016f z vn\u011bj\u0161\u00ed datab\u00e1ze a m\u00edstn\u00edch konfigura\u010dn\u00edch soubor\u016f (nap\u0159\u00edklad v m\u00edstn\u00edch souborech mohou z\u016fstat nastaven\u00ed s\u00ed\u0165ov\u00fdch rozhran\u00ed).\n<p>Pro S\u00daDB pro uchov\u00e1v\u00e1n\u00ed konfigurace je prozat\u00edm podporov\u00e1n pouze MySQL (pro uchov\u00e1v\u00e1n\u00ed datab\u00e1z\u00ed p\u0159id\u011blen\u00ed adres (leases) mohou b\u00fdt pou\u017eity MySQL, PostgreSQL a Cassandra, a pro rezervace hostitel\u016f MySQL a PostgreSQL). Konfigurace v DB m\u016f\u017ee b\u00fdt m\u011bn\u011bna jak prost\u0159ednictv\u00edm p\u0159\u00edm\u00e9ho p\u0159\u00edstupu k S\u00daDB, tak prost\u0159ednictv\u00edm speci\u00e1ln\u011b p\u0159ipraven\u00fdch knihoven-\u00farovn\u00ed, kter\u00e9 poskytuj\u00ed standardn\u00ed sadu p\u0159\u00edkaz\u016f pro spr\u00e1vu konfigurace, jako jsou p\u0159id\u00e1n\u00ed a odstran\u011bn\u00ed parametr\u016f, vazeb, DHCP mo\u017enost\u00ed a pods\u00edt\u00ed;<\/p>\n<li class=\"l\"> Byla p\u0159id\u00e1na nov\u00e1 t\u0159\u00edda zpracovatel\u016f \u201eDROP\u201c (v\u0161echny pakety souvisej\u00edc\u00ed s t\u0159\u00eddou DROP jsou okam\u017eit\u011b odm\u00edtnuty), kter\u00e1 m\u016f\u017ee b\u00fdt pou\u017eita k odm\u00edt\u00e1n\u00ed ne\u017e\u00e1douc\u00edho provozu, nap\u0159\u00edklad ur\u010dit\u00fdch typ\u016f DHCP zpr\u00e1v.\n<li class=\"l\"> Byly p\u0159id\u00e1ny nov\u00e9 parametry max-lease-time a min-lease-time, kter\u00e9 umo\u017e\u0148uj\u00ed definovat \u017eivotnost p\u0159id\u011blen\u00ed adresy klientovi (lease) ne ve form\u011b pevn\u011b stanoven\u00e9 hodnoty, ale jako p\u0159ijateln\u00fd rozsah;\n<li class=\"l\"> Byla vylep\u0161ena kompatibilita s za\u0159\u00edzen\u00edmi, kter\u00e1 nedodr\u017euj\u00ed pln\u011b standardy pro DHCP. Pro obch\u00e1zen\u00ed probl\u00e9m\u016f nyn\u00ed Kea odes\u00edl\u00e1 informace o typu zpr\u00e1vy DHCPv4 na za\u010d\u00e1tek seznamu mo\u017enost\u00ed, zpracov\u00e1v\u00e1 r\u016fzn\u00e9 reprezentace jmen hostitel\u016f, rozpozn\u00e1v\u00e1 p\u0159enos pr\u00e1zdn\u00e9ho jm\u00e9na hostitele a umo\u017e\u0148uje definovat submo\u017enosti s k\u00f3dy od 0 do 255;\n<li class=\"l\"> Pro d\u00e9mon DDNS byl p\u0159id\u00e1n samostatn\u00fd \u0159\u00eddic\u00ed socket, prost\u0159ednictv\u00edm kter\u00e9ho lze p\u0159\u00edmo p\u0159en\u00e1\u0161et p\u0159\u00edkazy a prov\u00e1d\u011bt zm\u011bny v konfiguraci. Podporov\u00e1ny jsou n\u00e1sleduj\u00edc\u00ed p\u0159\u00edkazy: build-report, config-get, config-reload, config-set, config-test, config-write, list-commands, shutdown a version-get;\n<li class=\"l\"> Opraveny <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/08\/29\/\">zranitelnosti<\/a><\/noindex> (CVE-2019-6472, CVE-2019-6473, CVE-2019-6474), kter\u00e9 mohou b\u00fdt vyu\u017eity k uskute\u010dn\u011bn\u00ed odm\u00edtnut\u00ed slu\u017eby (zp\u016fsoben\u00ed zhroucen\u00ed serverov\u00fdch zpracovatel\u016f DHCPv4 a DHCPv6) prost\u0159ednictv\u00edm zas\u00edl\u00e1n\u00ed po\u017eadavk\u016f s nespr\u00e1vn\u00fdmi mo\u017enostmi a hodnotami. Nejv\u011bt\u0161\u00ed nebezpe\u010d\u00ed p\u0159edstavuje probl\u00e9m <noindex><a rel=\"nofollow\" href=\"https:\/\/kb.isc.org\/docs\/cve-2019-6474\">CVE-2019-6474<\/a><\/noindex>, kter\u00fd v p\u0159\u00edpad\u011b pou\u017eit\u00ed pro vazby \u00falo\u017ei\u0161t\u011b memfile, br\u00e1n\u00ed mo\u017enosti samostatn\u00e9ho restartov\u00e1n\u00ed serverov\u00e9ho procesu, a proto k obnoven\u00ed funk\u010dnosti je zapot\u0159eb\u00ed manu\u00e1ln\u00ed z\u00e1sah administr\u00e1tora (\u00fadr\u017eba datab\u00e1ze vazeb).\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <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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