{"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\/da\/blog\/news\/vypusk-ntp-serverov-ntpsec-1-2-0-i-shrony-4-0-s-podderzhkoj-zashhishhyonnogo-protokola-nts","title":{"rendered":"Udgivelse af NTP-serverne NTPsec 1.2.0 og Chrony 4.0 med underst\u00f8ttelse af den sikre protokol NTS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

IETF (Internet Engineering Task Force), der arbejder med udviklingen af internetprotokoller og arkitektur, har afsluttet<\/a><\/noindex> dannelsen af RFC for protokollen NTS (Network Time Security) og offentliggjort den tilknyttede specifikation med identifikatoren RFC 8915<\/a><\/noindex>. RFC fik status som 'Forslag til standard', hvorefter arbejdet med at give RFC status som udkaststandard (Draft Standard) vil begynde, hvilket i praksis betyder fuld stabilisering af protokollen og hensyntagen til alle fremsatte bem\u00e6rkninger. <\/p>\n

Standardiseringen af NTS er et vigtigt skridt mod at forbedre sikkerheden i tjenester til synkronisering af pr\u00e6cistid og beskytte brugere mod angreb, der imiterer den NTP-server, som klienten opretter forbindelse til. Manipulationer fra ondsindede akt\u00f8rer, der involverer indstilling af forkert tid, kan bruges til at kompromittere sikkerheden for andre tidsafh\u00e6ngige protokoller som TLS. For eksempel kan \u00e6ndring af tid f\u00f8re til forkert fortolkning af data vedr\u00f8rende gyldigheden af TLS-certifikater. Hidtil har NTP og symmetrisk kryptering ikke v\u00e6ret i stand til at garantere, at klienten interagerer med den rigtige NTP-server og ikke en manipuleret version, og da n\u00f8gleautentifikation har v\u00e6ret for vanskelig at konfigurere, er den ikke blevet udbredt.<\/p>\n

NTS anvender elementer fra offentlig n\u00f8gleinfrastruktur (PKI) og g\u00f8r det muligt at bruge TLS og autentificeret kryptering AEAD (Authenticated Encryption with Associated Data) til kryptografisk at beskytte interaktionen mellem klienten og serveren via protokollen NTP (Network Time Protocol). NTS inkluderer to separate protokoller: NTS-KE (NTS Key Establishment til h\u00e5ndtering af initial autentifikation og n\u00f8gleudveksling over TLS) og NTS-EF (NTS Extension Fields, der er ansvarlig for kryptering og autentifikation af tidsynkroniseringssessionen). NTS tilf\u00f8jer flere udvidede felter i NTP-pakkerne og opbevarer al tilstandsinformation kun p\u00e5 klientsiden ved hj\u00e6lp af en cookie-overf\u00f8rselsmekanisme. Der er afsat netv\u00e6rksport 4460 til h\u00e5ndtering af forbindelser via NTS-protokollen.<\/p>\n

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

De f\u00f8rste implementeringer af den standardiserede NTS blev foresl\u00e5et i de for nylig offentliggjorte versioner af NTPsec 1.2.0<\/a><\/noindex> og Chrony 4.0<\/a><\/noindex>. Chrony<\/a><\/noindex> tilbyder en uafh\u00e6ngig implementering af klient og server NTP, der anvendes til synkronisering af pr\u00e6cistid i forskellige Linux-distributioner, herunder Fedora, Ubuntu, SUSE\/openSUSE og RHEL\/CentOS. NTPsec<\/a><\/noindex> udvikles<\/a><\/noindex> under ledelse af Eric Raymond (Eric S. Raymond) og er en fork af den referenceimplementering af NTPv4-protokollen (NTP Classic 4.3.34), der fokuserer p\u00e5 at omarbejde kodebasen for at \u00f8ge sikkerheden (foretaget oprydning i for\u00e6ldet kode, brugt metoder til at forhindre angreb og sikre funktioner til h\u00e5ndtering af hukommelse og strenge).<\/p>\n

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

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

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