{"id":96270,"date":"2020-10-10T01:42:13","date_gmt":"2020-10-09T23:42:13","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-ntp-serverov-ntpsec-1-2-0-i-shrony-4-0-s-podderzhkoj-zashhishhyonnogo-protokola-nts"},"modified":"2020-10-10T01:42:13","modified_gmt":"2020-10-09T23:42:13","slug":"vypusk-ntp-serverov-ntpsec-1-2-0-i-shrony-4-0-s-podderzhkoj-zashhishhyonnogo-protokola-nts","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/vypusk-ntp-serverov-ntpsec-1-2-0-i-shrony-4-0-s-podderzhkoj-zashhishhyonnogo-protokola-nts","title":{"rendered":"Vydanie NTP serverov NTPsec 1.2.0 a Chrony 4.0 s podporou zabezpe\u010den\u00e9ho protokolu NTS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdbor IETF (Internet Engineering Task Force), ktor\u00fd sa zaober\u00e1 rozvojom protokolov a architekt\u00fary internetu, ukon\u010dil<\/a><\/noindex> formovanie RFC pre protokol NTS (Network Time Security) a zverejnil s\u00favisiacu \u0161pecifik\u00e1ciu pod identifik\u00e1torom RFC 8915<\/a><\/noindex>. RFC z\u00edskal status \u201eNavrhovan\u00e9ho \u0161tandardu\u201c, po \u010dom sa za\u010dne pr\u00e1ca na udelen\u00ed statusu \u010diernohviezdov\u00e9ho \u0161tandardu (Draft Standard), \u010do v podstate znamen\u00e1 \u00fapln\u00fa stabiliz\u00e1ciu protokolu a zoh\u013eadnenie v\u0161etk\u00fdch vyjadren\u00fdch pripomienok. <\/p>\n

\u0160tandardiz\u00e1cia NTS je d\u00f4le\u017eit\u00fdm krokom na zv\u00fd\u0161enie bezpe\u010dnosti slu\u017eieb synchroniz\u00e1cie presn\u00e9ho \u010dasu a ochranu pou\u017e\u00edvate\u013eov pred \u00fatokmi, ktor\u00e9 napodob\u0148uj\u00fa NTP server, s ktor\u00fdm sa klient prip\u00e1ja. Manipul\u00e1cie zlo\u010dincov s\u00favisiace s nastaven\u00edm nespr\u00e1vneho \u010dasu m\u00f4\u017eu by\u0165 pou\u017eit\u00e9 na ohrozenie bezpe\u010dnosti in\u00fdch protokolov, ktor\u00e9 ber\u00fa do \u00favahy \u010das, ako napr\u00edklad TLS. Napr\u00edklad zmena \u010dasu m\u00f4\u017ee vies\u0165 k nespr\u00e1vnej interpret\u00e1cii \u00fadajov o platnosti TLS certifik\u00e1tov. Doteraz NTP a symetrick\u00e9 \u0161ifrovanie komunika\u010dn\u00fdch kan\u00e1lov nezaru\u010dovali, \u017ee klient interaguje s cie\u013eov\u00fdm, a nie podvodn\u00fdm NTP serverom, a autentifik\u00e1cia na z\u00e1klade k\u013e\u00fa\u010dov sa neroz\u0161\u00edrila, preto\u017ee je pr\u00edli\u0161 zlo\u017eit\u00e1 na nastavenie.<\/p>\n

NTS vyu\u017e\u00edva prvky infra\u0161trukt\u00fary otvoren\u00fdch k\u013e\u00fa\u010dov (PKI) a umo\u017e\u0148uje pou\u017e\u00edva\u0165 TLS a autentifikovan\u00e9 \u0161ifrovanie AEAD (Authenticated Encryption with Associated Data) na kryptografick\u00fa ochranu interakcie klienta a servera prostredn\u00edctvom protokolu NTP (Network Time Protocol). NTS obsahuje dva samostatn\u00e9 protokoly: NTS-KE (NTS Key Establishment pre spracovanie po\u010diato\u010dnej autentifik\u00e1cie a dohodu k\u013e\u00fa\u010dov nad TLS) a NTS-EF (NTS Extension Fields, zodpoved\u00e1 za \u0161ifrovanie a autentifik\u00e1ciu synchroniza\u010dnej rel\u00e1cie). NTS prid\u00e1va do paketov NTP nieko\u013eko roz\u0161\u00edren\u00fdch pol\u00ed a uchov\u00e1va v\u0161etky inform\u00e1cie o stave iba na strane klienta, pri\u010dom vyu\u017e\u00edva mechanizmus prenosu cookie. Na spracovanie spojen\u00ed prostredn\u00edctvom protokolu NTS je vyhraden\u00fd sie\u0165ov\u00fd port 4460.<\/p>\n

\"Vydanie<\/a><\/noindex><\/center><\/p>\n

Prv\u00e9 implement\u00e1cie \u0161tandardizovan\u00e9ho NTS boli navrhnut\u00e9 v ned\u00e1vno zverejnen\u00fdch verzi\u00e1ch NTPsec 1.2.0<\/a><\/noindex> a Chrony 4.0<\/a><\/noindex>. Chrony<\/a><\/noindex> Predstavuje nez\u00e1visl\u00fa implement\u00e1ciu klienta a servera NTP, ktor\u00e1 sa pou\u017e\u00edva na synchroniz\u00e1ciu presn\u00e9ho \u010dasu v r\u00f4znych distrib\u00faci\u00e1ch Linuxu, vr\u00e1tane Fedora, Ubuntu, SUSE\/openSUSE a RHEL\/CentOS. NTPsec<\/a><\/noindex> se vyv\u00edj\u00ed<\/a><\/noindex> Pod veden\u00edm Erica Raymonda (Eric S. Raymond) a je fork referen\u010dnej implement\u00e1cie protokolu NTPv4 (NTP Classic 4.3.34), zameran\u00fd na prerobenie k\u00f3dovej z\u00e1kladne s cie\u013eom zv\u00fd\u0161i\u0165 bezpe\u010dnos\u0165 (bola vykonan\u00e1 \u010distka zastaran\u00e9ho k\u00f3du, boli zaveden\u00e9 met\u00f3dy prevencie \u00fatokov a zabezpe\u010den\u00e9 funkcie na pr\u00e1cu s pam\u00e4\u0165ou a re\u0165azcami).<\/p>\n

<\/a><\/noindex><\/p>\n

Zdroj: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u0438\u0442\u0435\u0442 IETF (Internet Engineering Task Force), \u0437\u0430\u043d\u0438\u043c\u0430\u044e\u0449\u0438\u0439\u0441\u044f \u0440\u0430\u0437\u0432\u0438\u0442\u0438\u0435\u043c \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u043e\u0432 \u0438 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u044b \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442\u0430, \u0437\u0430\u0432\u0435\u0440\u0448\u0438\u043b \u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 RFC \u0434\u043b\u044f \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 NTS (Network Time Security) \u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u0443\u044e \u0441 \u043d\u0438\u043c \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044e \u043f\u043e\u0434 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u043c RFC 8915. 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