{"id":95368,"date":"2020-09-28T13:42:14","date_gmt":"2020-09-28T11:42:14","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-openssh-8-4"},"modified":"2020-09-28T13:42:14","modified_gmt":"2020-09-28T11:42:14","slug":"reliz-openssh-8-4","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/reliz-openssh-8-4","title":{"rendered":"Udgivelse af OpenSSH 8.4","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Efter fire m\u00e5neders udvikling <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.mindrot.org\/pipermail\/openssh-unix-dev\/2020-September\/038826.html\">pr\u00e6senteret<\/a><\/noindex> udgivelsen af OpenSSH 8.4, en open source-implementering af klient og server til arbejde med SSH 2.0 og SFTP-protokoller.<\/p>\n<p>Vigtige \u00e6ndringer:<\/p>\n<ul>\n<li class=\"l\"> \u00c6ndringer relateret til sikkerhed:\n<ul>\n<li class=\"l\"> I ssh-agent vil der nu blive udf\u00f8rt en kontrol, n\u00e5r man bruger FIDO-n\u00f8gler, der ikke er oprettet til autentifikation via SSH (n\u00f8gleidentifikatoren starter ikke med teksten \"ssh:\"), for at sikre, at meddelelsen vil blive underskrevet ved hj\u00e6lp af metoder anvendt i SSH-protokollen. \u00c6ndringen vil forhindre at omdirigere ssh-agent til fjernhosts med FIDO-n\u00f8gler for at blokere muligheden for at bruge disse n\u00f8gler til at danne signaturer for webautentifikationsanmodninger (det omvendte, hvor browseren kan underskrive en SSH-anmodning, blev oprindeligt udelukket ved at anvende pr\u00e6fikset \"ssh:\" i n\u00f8gleidentifikatoren).\n<li class=\"l\"> I ssh-keygen er underst\u00f8ttelse af credProtect-udvidelsen, der er beskrevet i FIDO 2.1-specifikationen, indf\u00f8rt ved generering af residentn\u00f8gler, hvilket giver ekstra beskyttelse for n\u00f8glerne via en obligatorisk anmodning om indtastning af PIN-kode f\u00f8r udf\u00f8relse af enhver operation, der kan f\u00f8re til udtr\u00e6kning af den residentn\u00f8gle fra tokenet.\n<\/ul>\n<li class=\"l\"> \u00c6ndringer, der potentielt kan bryde kompatibiliteten:\n<ul>\n<li class=\"l\"> For at underst\u00f8tte FIDO\/U2F anbefales det at bruge bibliotektet libfido2 i det mindste version 1.5.0. Der er delvist implementeret mulighed for at bruge \u00e6ldre versioner, men i s\u00e5 fald vil funktioner som residentn\u00f8gler, PIN-anmodning og tilslutning af flere tokens ikke v\u00e6re tilg\u00e6ngelige.\n<li class=\"l\"> I ssh-keygen er der tilf\u00f8jet data til autentificatoren, der er n\u00f8dvendige for at verificere bekr\u00e6ftende digitale underskrifter, i formatet af bekr\u00e6ftelsesinformation, der valgfrit gemmes ved generering af FIDO-n\u00f8glen.\n<li class=\"l\"> API'et, der anvendes ved interaktion mellem OpenSSH og tjenesten til adgang til FIDO-tokens, er \u00e6ndret.\n<li class=\"l\"> Ved opbygningen af den b\u00e6rbare version af OpenSSH kr\u00e6ves automake nu for at generere konfigurationsscriptet og de tilh\u00f8rende bygge-filer (hvis bygningen udf\u00f8res fra den offentliggjorte tar-fil med koden, kr\u00e6ves der ikke regenerering af konfigurationen).\n<\/ul>\n<li class=\"l\"> I ssh og ssh-keygen er der tilf\u00f8jet support til FIDO-n\u00f8gler, der kr\u00e6ver bekr\u00e6ftelse med en PIN-kode. For at generere n\u00f8gler med en PIN i ssh-keygen er der tilf\u00f8jet en mulighed \"verify-required\". Ved brug af s\u00e5danne n\u00f8gler, vil brugeren f\u00e5 vist en prompt, der kr\u00e6ver bekr\u00e6ftelse af deres handlinger ved at indtaste PIN-koden, f\u00f8r signaturoperationen udf\u00f8res.\n<li class=\"l\"> I sshd er der implementeret en mulighed \"verify-required\" i konfigurationen authorized_keys, som kr\u00e6ver anvendelse af verifikationsmetoder for brugerens tilstedev\u00e6relse under token-operationer. FIDO-standarden omfatter flere varianter af s\u00e5dan verifikation, men i \u00f8jeblikket underst\u00f8tter OpenSSH kun PIN-baseret verifikation.\n<li class=\"l\"> I sshd og ssh-keygen er der tilf\u00f8jet st\u00f8tte til verifikation af digitale signaturer, der overholder FIDO Webauthn-standarden, som muligg\u00f8r brugen af FIDO-n\u00f8gler i web-browserne.\n<li class=\"l\"> I ssh i indstillingerne CertificateFile,<br \/>\n   ControlPath, IdentityAgent, IdentityFile, LocalForward og<br \/>\n   RemoteForward tillader nu indstilling af v\u00e6rdier fra milj\u00f8variabler angivet i formatet \"${ENV}\". <\/p>\n<li class=\"l\"> I ssh og ssh-agent er der tilf\u00f8jet st\u00f8tte til milj\u00f8variablen $SSH_ASKPASS_REQUIRE, som kan bruges til at aktivere eller deaktivere kaldet til ssh-askpass.\n<li class=\"l\"> I ssh er der i ssh_config under direktivet AddKeysToAgent tilf\u00f8jet muligheden for at begr\u00e6nse n\u00f8glernes gyldighedsperiode. Efter udl\u00f8bet af den specificerede gr\u00e6nse fjernes n\u00f8glerne automatisk fra ssh-agent.\n<li class=\"l\"> I scp og sftp kan man nu eksplicit tillade omdirigering med ssh-agent ved hj\u00e6lp af flaget \"-A\" (som standard er omdirigering forbudt).\n<li class=\"l\"> I ssh-indstillingerne er der tilf\u00f8jet support til substitution af \"%k\", der definerer navnet p\u00e5 v\u00e6rtsn\u00f8glen. Den angivne mulighed kan bruges til at adskille n\u00f8gler i separate filer (for eksempel \"UserKnownHostsFile ~\/.ssh\/known_hosts.d\/%k\").\n<li class=\"l\"> Det er tilladt at bruge operationen \"ssh-add -d -\" til at l\u00e6se n\u00f8gler fra stdin, som skal fjernes.\n<li class=\"l\"> I sshd er der sikret logf\u00f8ring af begyndelsen og afslutningen af processen med at begr\u00e6nse forbindelser, reguleret af parameteren MaxStartups.\n<\/ul>\n<p>Udviklerne af OpenSSH minder ogs\u00e5 om den kommende overgang til at betragte algoritmer, der bruger SHA-1-hash, som for\u00e6ldede, i forbindelse med <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52149\">for\u00f8gelsen<\/a><\/noindex> effektiviteten af kollisionsangreb med et givet pr\u00e6fiks (omkostningerne ved at finde en kollision estimeres til cirka 45.000 dollars). I en af de kommende udgaver planl\u00e6gges det at deaktivere muligheden for at bruge algoritmen til digitale signaturer baseret p\u00e5 offentlige n\u00f8gler &#171;ssh-rsa&#187; som standard, hvilket n\u00e6vnes i den originale RFC for SSH-protokollen og stadig er meget udbredt i praksis (for at tjekke brugen af ssh-rsa i dine systemer kan du pr\u00f8ve at oprette forbindelse via ssh med indstillingen &#171;-oHostKeyAlgorithms=-ssh-rsa&#187;).<\/p>\n<p>For at lette overgangen til de nye algoritmer i OpenSSH vil konfigurationen UpdateHostKeys som standard blive aktiveret i den n\u00e6ste udgivelse, hvilket vil g\u00f8re det muligt automatisk at overf\u00f8re klienterne til mere p\u00e5lidelige algoritmer. Blandt de anbefalede algoritmer til migration n\u00e6vnes rsa-sha2-256\/512 baseret p\u00e5 RFC8332 RSA SHA-2 (underst\u00f8ttet siden OpenSSH 7.2 og brugt som standard), ssh-ed25519 (underst\u00f8ttet siden OpenSSH 6.5) og ecdsa-sha2-nistp256\/384\/521 baseret p\u00e5 RFC5656 ECDSA (underst\u00f8ttet siden OpenSSH 5.7). <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Kilde: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=53793\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0447\u0435\u0442\u044b\u0440\u0451\u0445 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.4, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430\u043c SSH 2.0 \u0438 SFTP. \u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f: \u0418\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0435 \u0441 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c\u044e: \u0412 ssh-agent \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u043a\u043b\u044e\u0447\u0435\u0439 FIDO, \u0441\u043e\u0437\u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0435 \u0434\u043b\u044f \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0447\u0435\u0440\u0435\u0437 SSH (\u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440 \u043a\u043b\u044e\u0447\u0430 \u043d\u0430\u0447\u0438\u043d\u0430\u0435\u0442\u0441\u044f \u043d\u0435 \u0441\u043e \u0441\u0442\u0440\u043e\u043a\u0438 &#171;ssh:&#187;), \u0442\u0435\u043f\u0435\u0440\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430, \u0447\u0442\u043e \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435 \u0431\u0443\u0434\u0435\u0442 \u043f\u043e\u0434\u043f\u0438\u0441\u0430\u043d\u043e \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-95368","post","type-post","status-publish","format-standard","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=\"\u041f\u043e\u0441\u043b\u0435 \u0447\u0435\u0442\u044b\u0440\u0451\u0445 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.4, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/da\/blog\/news\/reliz-openssh-8-4\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"da_DK\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47\u0420\u0435\u043b\u0438\u0437 OpenSSH 8.4 | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\u041f\u043e\u0441\u043b\u0435 \u0447\u0435\u0442\u044b\u0440\u0451\u0445 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.4, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/da\/blog\/news\/reliz-openssh-8-4\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2020-09-28T11:42:14+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2020-09-28T11:42:14+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Udgivelse af OpenSSH 8.4 | ProHoster","description":"Efter fire m\u00e5neders udvikling pr\u00e6senteres udgivelsen af OpenSSH 8.4, en \u00e5ben implementering.","canonical_url":"https:\/\/prohoster.info\/da\/blog\/news\/reliz-openssh-8-4","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"da_DK","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0420\u0435\u043b\u0438\u0437 OpenSSH 8.4 | ProHoster","og:description":"\u041f\u043e\u0441\u043b\u0435 \u0447\u0435\u0442\u044b\u0440\u0451\u0445 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.4, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438.","og:url":"https:\/\/prohoster.info\/da\/blog\/news\/reliz-openssh-8-4","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2020-09-28T11:42:14+00:00","article:modified_time":"2020-09-28T11:42:14+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"95368","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":null,"schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":null,"breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2021-02-28 11:07:31","updated":"2022-10-03 18:22:53","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/95368","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/comments?post=95368"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/95368\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/media?parent=95368"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/categories?post=95368"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/tags?post=95368"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}