{"id":101069,"date":"2021-08-20T22:22:44","date_gmt":"2021-08-20T20:22:44","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-openssh-8-7"},"modified":"2021-08-20T22:22:44","modified_gmt":"2021-08-20T20:22:44","slug":"reliz-openssh-8-7","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/reliz-openssh-8-7","title":{"rendered":"Verze OpenSSH 8.7","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Po \u010dty\u0159ech m\u011bs\u00edc\u00edch v\u00fdvoje byl uveden do provozu OpenSSH 8.7, otev\u0159en\u00e1 implementace klienta a serveru pro pr\u00e1ci s protokoly SSH 2.0 a SFTP.      <\/p>\n<p>Hlavn\u00ed zm\u011bny:  <\/p>\n<ul>\n<li class=\"l\"> Do scp byl p\u0159id\u00e1n experiment\u00e1ln\u00ed re\u017eim p\u0159enosu dat pomoc\u00ed protokolu SFTP nam\u00edsto tradi\u010dn\u011b pou\u017e\u00edvan\u00e9ho protokolu SCP\/RCP. V SFTP jsou pou\u017e\u00edv\u00e1ny p\u0159edv\u00eddateln\u011bj\u0161\u00ed metody zpracov\u00e1n\u00ed n\u00e1zv\u016f a nen\u00ed vyu\u017e\u00edv\u00e1no zpracov\u00e1n\u00ed glob\u00e1ln\u00edch vzor\u016f p\u0159es shell na stran\u011b jin\u00e9ho hostitele, co\u017e vytv\u00e1\u0159\u00ed bezpe\u010dnostn\u00ed probl\u00e9my. Pro povolen\u00ed SFTP v scp byl navr\u017een p\u0159ep\u00edna\u010d \u201e-s\u201c, ale v budoucnu se pl\u00e1nuje p\u0159ej\u00edt na tento protokol jako v\u00fdchoz\u00ed.\n<li class=\"l\"> V sftp-server byly implementov\u00e1ny roz\u0161\u00ed\u0159en\u00ed protokolu SFTP pro odkryt\u00ed cest ~\\\/ a ~user\\\/, co\u017e je nezbytn\u00e9 pro scp.\n<li class=\"l\"> V utilit\u011b scp bylo zm\u011bn\u011bno chov\u00e1n\u00ed p\u0159i kop\u00edrov\u00e1n\u00ed soubor\u016f mezi dv\u011bma vzd\u00e1len\u00fdmi hostiteli (nap\u0159\u00edklad \u201escp host-a:\/cesta host-b:\u201c), kter\u00e9 nyn\u00ed prob\u00edh\u00e1 v\u00fdchoz\u00edm zp\u016fsobem p\u0159es mezilehl\u00fd lok\u00e1ln\u00ed hostitel, jako p\u0159i zad\u00e1n\u00ed p\u0159ep\u00edna\u010de \u201e-3\u201c. Tento p\u0159\u00edstup umo\u017e\u0148uje vyhnout se p\u0159enosu nepot\u0159ebn\u00fdch p\u0159ihla\u0161ovac\u00edch \u00fadaj\u016f na prvn\u00ed hostitel a troj\u00edmu zpracov\u00e1n\u00ed n\u00e1zv\u016f soubor\u016f v shellu (na stran\u011b zdroje, p\u0159\u00edjemce a lok\u00e1ln\u00edho syst\u00e9mu), a tak\u00e9 p\u0159i pou\u017eit\u00ed SFTP umo\u017e\u0148uje vyu\u017e\u00edt v\u0161echny metody autentizace p\u0159i p\u0159\u00edstupu k vzd\u00e1len\u00fdm hostitel\u016fm, nejen neinteraktivn\u00ed metody. Pro obnoven\u00ed star\u00e9ho chov\u00e1n\u00ed byla p\u0159id\u00e1na volba \u201e-R\u201c.\n<li class=\"l\"> Do ssh byla p\u0159id\u00e1na nastaven\u00ed ForkAfterAuthentication, odpov\u00eddaj\u00edc\u00ed p\u0159ep\u00edna\u010di \u201e-f\u201c.\n<li class=\"l\"> Do ssh byla p\u0159id\u00e1na nastaven\u00ed StdinNull, odpov\u00eddaj\u00edc\u00ed p\u0159ep\u00edna\u010di \u201e-n\u201c.\n<li class=\"l\"> Do ssh byla p\u0159id\u00e1na nastaven\u00ed SessionType, skrze kter\u00e9 je mo\u017en\u00e9 nastavit re\u017eimy odpov\u00eddaj\u00edc\u00ed p\u0159ep\u00edna\u010d\u016fm \u201e-N\u201c (bez relace) a \u201e-s\u201c (pod syst\u00e9m).\n<li class=\"l\"> Ve ssh-keygen je nyn\u00ed mo\u017en\u00e9 v souborech s kl\u00ed\u010di ur\u010dit interval platnosti kl\u00ed\u010de.\n<li class=\"l\"> Do ssh-keygen byl p\u0159id\u00e1n p\u0159ep\u00edna\u010d \u201e-Oprint-pubkey\u201c pro v\u00fdstup \u00fapln\u00e9ho ve\u0159ejn\u00e9ho kl\u00ed\u010de jako sou\u010d\u00e1st podpisu sshsig.\n<li class=\"l\"> V ssh a sshd, jak klient, tak server, byly p\u0159evedeny na pou\u017eit\u00ed p\u0159\u00edsn\u011bj\u0161\u00edho parseru konfigura\u010dn\u00edho souboru, kter\u00fd pou\u017e\u00edv\u00e1 pravidla podobn\u00e1 shellu pro zpracov\u00e1n\u00ed uvozovek, mezer a escape znak\u016f. Nov\u00fd parser tak\u00e9 neomezuje d\u0159\u00edv\u011bj\u0161\u00ed p\u0159edpoklady, jako je vynech\u00e1v\u00e1n\u00ed argument\u016f v mo\u017enostech (nap\u0159\u00edklad nyn\u00ed nelze zanechat pr\u00e1zdnou direktivu DenyUsers), nezav\u0159en\u00e9 uvozovky a zad\u00e1v\u00e1n\u00ed n\u011bkolika symbol\u016f \u201e=\u201c.\n<li class=\"l\"> P\u0159i pou\u017e\u00edv\u00e1n\u00ed z\u00e1znam\u016f DNS SSHFP p\u0159i ov\u011b\u0159ov\u00e1n\u00ed kl\u00ed\u010d\u016f nyn\u00ed ssh kontroluje v\u0161echny odpov\u00eddaj\u00edc\u00ed z\u00e1znamy, nikoli pouze ty, kter\u00e9 obsahuj\u00ed ur\u010dit\u00fd typ digit\u00e1ln\u00edho podpisu.\n<li class=\"l\"> V ssh-keygen p\u0159i generov\u00e1n\u00ed kl\u00ed\u010de FIDO s pou\u017eit\u00edm mo\u017enosti -Ochallenge pro hashov\u00e1n\u00ed se nyn\u00ed pou\u017e\u00edv\u00e1 vestav\u011bn\u00e1 vrstva, nikoli prost\u0159edky libfido2, co\u017e umo\u017e\u0148uje pou\u017eit\u00ed v\u00fdzev o velikosti ni\u017e\u0161\u00ed i vy\u0161\u0161\u00ed ne\u017e 32 bajt\u016f.\n<li class=\"l\"> V sshd p\u0159i zpracov\u00e1n\u00ed direktivy environment=\u201e\u2026\u201c v souborech authorized_keys nyn\u00ed plat\u00ed prvn\u00ed shoda a je zavedeno omezen\u00ed na 1024 n\u00e1zv\u016f prom\u011bnn\u00fdch prost\u0159ed\u00ed.    <\/ul>\n<p>V\u00fdvoj\u00e1\u0159i OpenSSH tak\u00e9 varovali p\u0159ed p\u0159eveden\u00edm do kategorie zastaral\u00fdch algoritm\u016f, kter\u00e9 pou\u017e\u00edvaj\u00ed hashov\u00e1n\u00ed SHA-1, kv\u016fli rostouc\u00ed efektivit\u011b kolizn\u00edch \u00fatok\u016f se zadan\u00fdm prefixem (n\u00e1klady na nalezen\u00ed kolize jsou odhadov\u00e1ny na p\u0159ibli\u017en\u011b 50 tis\u00edc dolar\u016f). V n\u00e1sleduj\u00edc\u00ed verzi bude pl\u00e1nov\u00e1no vy\u0159adit ve v\u00fdchoz\u00edm nastaven\u00ed mo\u017enost pou\u017eit\u00ed algoritmu digit\u00e1ln\u00edho podpisu pomoc\u00ed otev\u0159en\u00e9ho kl\u00ed\u010de &#171;ssh-rsa&#187;, kter\u00fd je zm\u00edn\u011bn v origin\u00e1ln\u00edm RFC pro protokol SSH a z\u016fst\u00e1v\u00e1 \u0161iroce roz\u0161\u00ed\u0159en v praxi.    <\/p>\n<p>Pro ov\u011b\u0159en\u00ed pou\u017eit\u00ed ssh-rsa ve va\u0161ich syst\u00e9mech m\u016f\u017eete zkusit p\u0159ipojen\u00ed p\u0159es ssh s volbou &#171;-oHostKeyAlgorithms=-ssh-rsa&#187;. To v\u0161ak automatick\u00e9 zru\u0161en\u00ed digit\u00e1ln\u00edch podpis\u016f &#171;ssh-rsa&#187; ve v\u00fdchoz\u00edm nastaven\u00ed neznamen\u00e1 \u00fapln\u00fd vzd\u00e1n\u00ed se pou\u017e\u00edv\u00e1n\u00ed RSA kl\u00ed\u010d\u016f, proto\u017ee vedle SHA-1 protokol SSH umo\u017e\u0148uje pou\u017eit\u00ed dal\u0161\u00edch algoritm\u016f pro v\u00fdpo\u010det hash\u016f. Konkr\u00e9tn\u011b, vedle &#171;ssh-rsa&#187; z\u016fstane mo\u017enost pou\u017eit\u00ed p\u00e1r\u016f &#171;rsa-sha2-256&#187; (RSA\/SHA256) a &#171;rsa-sha2-512&#187; (RSA\/SHA512).    <\/p>\n<p>Aby se usnadnil p\u0159echod na nov\u00e9 algoritmy, byla v OpenSSH d\u0159\u00edve ve v\u00fdchoz\u00edm nastaven\u00ed aktivov\u00e1na konfigurace UpdateHostKeys, kter\u00e1 umo\u017e\u0148uje automaticky p\u0159en\u00e9st klienty na spolehliv\u011bj\u0161\u00ed algoritmy. Touto konfigurac\u00ed se aktivuje speci\u00e1ln\u00ed roz\u0161\u00ed\u0159en\u00ed protokolu &#171;hostkeys@openssh.com&#187;, kter\u00e9 umo\u017e\u0148uje <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/dts-shicago\/\"   title=\"serveru\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2899\">serveru<\/a> po \u00fasp\u011b\u0161n\u00e9 autentizaci informovat klienta o v\u0161ech dostupn\u00fdch kl\u00ed\u010d\u00edch hostitele. Klient m\u016f\u017ee tyto kl\u00ed\u010de zaznamenat do sv\u00e9ho souboru ~\/.ssh\/known_hosts, co\u017e usnad\u0148uje aktualizaci kl\u00ed\u010d\u016f hostitele a zjednodu\u0161uje v\u00fdm\u011bnu kl\u00ed\u010d\u016f. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/dts-newyork\/\"   title=\"serveru\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2669\">serveru<\/a>.     <\/p>\n<p>Pou\u017eit\u00ed UpdateHostKeys je omezeno n\u011bkolika v\u00fdhradami, kter\u00e9 mohou b\u00fdt v budoucnu zru\u0161eny: kl\u00ed\u010d mus\u00ed b\u00fdt uveden ve UserKnownHostsFile a nem\u011bl by b\u00fdt pou\u017e\u00edv\u00e1n v GlobalKnownHostsFile; kl\u00ed\u010d mus\u00ed b\u00fdt p\u0159\u00edtomen pouze pod jedn\u00edm jm\u00e9nem; nem\u011bl by b\u00fdt pou\u017eit certifik\u00e1t hostitelsk\u00e9ho kl\u00ed\u010de; v known_hosts by nem\u011bly b\u00fdt pou\u017eity masky podle n\u00e1zvu hostitele; mus\u00ed b\u00fdt zak\u00e1z\u00e1na volba VerifyHostKeyDNS; mus\u00ed b\u00fdt aktivn\u00ed parametr UserKnownHostsFile.     <\/p>\n<p>Mezi doporu\u010den\u00fdmi algoritmy pro migraci jsou zm\u00edn\u011bny rsa-sha2-256\/512 podle RFC8332 RSA SHA-2 (podporov\u00e1no od OpenSSH 7.2 a pou\u017e\u00edv\u00e1no jako v\u00fdchoz\u00ed), ssh-ed25519 (podporov\u00e1no od OpenSSH 6.5) a ecdsa-sha2-nistp256\/384\/521 podle RFC5656 ECDSA (podporov\u00e1no od OpenSSH 5.7).<br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55665\">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 8.7, \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: \u0412 scp \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 \u0440\u0435\u0436\u0438\u043c \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 SFTP \u0432\u043c\u0435\u0441\u0442\u043e \u0442\u0440\u0430\u0434\u0438\u0446\u0438\u043e\u043d\u043d\u043e \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u0433\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 SCP\/RCP. \u0412 SFTP \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u044e\u0442\u0441\u044f \u0431\u043e\u043b\u0435\u0435 \u043f\u0440\u0435\u0434\u0441\u043a\u0430\u0437\u0443\u0435\u043c\u044b\u0435 \u043c\u0435\u0442\u043e\u0434\u044b \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0438\u043c\u0451\u043d \u0438 \u043d\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0430 glob-\u0448\u0430\u0431\u043b\u043e\u043d\u043e\u0432 \u0447\u0435\u0440\u0435\u0437 shell \u043d\u0430 [&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-101069","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 8.7, \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 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