{"id":38754,"date":"2019-10-31T22:25:45","date_gmt":"2019-10-31T19:25:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/reliz-openssh-8-1\/"},"modified":"2019-10-31T22:25:45","modified_gmt":"2019-10-31T19:25:45","slug":"reliz-openssh-8-1","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/reliz-openssh-8-1","title":{"rendered":"Vydanie OpenSSH 8.1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Po \u0161iestich mesiacoch v\u00fdvoja <noindex><a rel=\"nofollow\" href=\"http:\/\/lists.mindrot.org\/pipermail\/openssh-unix-dev\/2019-October\/037966.html\">predstaven\u00e9<\/a><\/noindex> uvo\u013enenie <noindex><a rel=\"nofollow\" href=\"http:\/\/www.openssh.com\/\">OpenSSH 8.1<\/a><\/noindex>, otvoren\u00e1 implement\u00e1cia klienta a servera na pr\u00e1cu s protokolmi SSH 2.0 a SFTP. <\/p>\n<p>Nov\u00e9 vydanie si zasl\u00fa\u017ei osobitn\u00fa pozornos\u0165 pri odstra\u0148ovan\u00ed zranite\u013enosti, ktor\u00e1 ovplyv\u0148uje ssh, sshd, ssh-add a ssh-keygen. Probl\u00e9m je pr\u00edtomn\u00fd v k\u00f3de na spracovanie priv\u00e1tnych k\u013e\u00fa\u010dov typu XMSS a umo\u017e\u0148uje \u00fato\u010dn\u00edkovi iniciova\u0165 prete\u010denie cel\u00e9ho \u010d\u00edsla. Zranite\u013enos\u0165 je ozna\u010den\u00e1 ako zneu\u017eite\u013en\u00e1, ale m\u00e1lo praktick\u00e1, preto\u017ee podpora XMSS k\u013e\u00fa\u010dov patr\u00ed medzi experiment\u00e1lne mo\u017enosti, ktor\u00e9 s\u00fa predvolene vypnut\u00e9 (vo pren\u00e1\u0161anej verzii v autoconf dokonca nie je zahrnut\u00e1 mo\u017enos\u0165 kompil\u00e1cie pre zapnutie XMSS).<\/p>\n<p>Hlavn\u00e9 zmeny: <\/p>\n<ul>\n<li class=\"l\"> v ssh, sshd a ssh-agent <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50929\">bol pridan\u00fd<\/a><\/noindex> k\u00f3d, ktor\u00fd br\u00e1ni obnove priv\u00e1tneho k\u013e\u00fa\u010da nach\u00e1dzaj\u00faceho sa v opera\u010dnej pam\u00e4ti v d\u00f4sledku \u00fatokov cez ved\u013eaj\u0161ie kan\u00e1ly, ako s\u00fa <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=47856\">Spectre, Meltdown<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=41340\">RowHammer<\/a><\/noindex> a <noindex><a rel=\"nofollow\" href=\"https:\/\/rambleed.com\/\">RAMBleed<\/a><\/noindex>. Priv\u00e1tne k\u013e\u00fa\u010de s\u00fa teraz \u0161ifrovan\u00e9 pri na\u010d\u00edtavan\u00ed do pam\u00e4te a de\u0161ifrovan\u00e9 iba v momentoch pou\u017eitia, v ostatn\u00fdch \u010dasoch zost\u00e1vaj\u00fa \u0161ifrovan\u00e9. Pri takejto pr\u00edstupe potrebuje \u00fato\u010dn\u00edk na \u00faspe\u0161n\u00e9 obnovenie priv\u00e1tneho k\u013e\u00fa\u010da predt\u00fdm obnovi\u0165 n\u00e1hodne vygenerovan\u00fd medzik\u013e\u00fa\u010d s ve\u013ekos\u0165ou 16 KB, ktor\u00fd sa pou\u017e\u00edva na \u0161ifrovanie hlavn\u00e9ho k\u013e\u00fa\u010da, \u010do je nepravdepodobn\u00e9 vzh\u013eadom na typick\u00fa frekvenciu ch\u00fdb obnovenia pri modern\u00fdch \u00fatokoch;\n<li class=\"l\"> V  <noindex><a rel=\"nofollow\" href=\"https:\/\/man.openbsd.org\/ssh-keygen.1\">ssh-keygen<\/a><\/noindex>  bola pridan\u00e1 experiment\u00e1lna podpora zjednodu\u0161en\u00e9ho syst\u00e9mu na vytv\u00e1ranie a overovanie digit\u00e1lnych podpisov. Digit\u00e1lne podpisy m\u00f4\u017eu by\u0165 vytvoren\u00e9 pomocou be\u017en\u00fdch SSH k\u013e\u00fa\u010dov, ktor\u00e9 s\u00fa ulo\u017een\u00e9 na disku alebo v ssh-agent, a overen\u00e9 pomocou podobn\u00e9ho ako authorized_keys <noindex><a rel=\"nofollow\" href=\"https:\/\/man.openbsd.org\/ssh-keygen.1#ALLOWED_SIGNERS\">zoznamu povolen\u00fdch k\u013e\u00fa\u010dov<\/a><\/noindex>. Do digit\u00e1lneho podpisu je za\u010dlenen\u00e1 inform\u00e1cia o mennom priestore, aby sa predi\u0161lo zm\u00e4tku pri pou\u017eit\u00ed v r\u00f4znych oblastiach (napr\u00edklad pre email a s\u00fabory);\n<li class=\"l\"> ssh-keygen je predvolene nastaven\u00fd na pou\u017e\u00edvanie algoritmu rsa-sha2-512 pri overovan\u00ed certifik\u00e1tov digit\u00e1lnym podpisom pomocou RSA k\u013e\u00fa\u010da (v prev\u00e1dzkovom re\u017eime CA). Tak\u00e9to certifik\u00e1ty nie s\u00fa kompatibiln\u00e9 s verziami pred OpenSSH 7.2 (na zabezpe\u010denie kompatibility by sa mal predefinova\u0165 typ algoritmu, napr\u00edklad pomocou pr\u00edkazu &#171;ssh-keygen -t ssh-rsa -s &#8230;&#187;);\n<li class=\"l\"> V ssh je vo v\u00fdraze ProxyCommand implementovan\u00e1 podpora pre roz\u0161\u00edrenie n\u00e1hrady &#171;%n&#187; (n\u00e1zov hostite\u013ea uveden\u00fd v adresnom riadku);\n<li class=\"l\"> V zoznamoch \u0161ifrovac\u00edch algoritmov pre ssh a sshd je teraz mo\u017en\u00e9 na vkladanie navrhovan\u00fdch predvolen\u00fdch algoritmov pou\u017ei\u0165 symbol &#171;^&#187;. Napr\u00edklad pre pridanie ssh-ed25519 do predvolen\u00e9ho zoznamu m\u00f4\u017eete zada\u0165 &#171;HostKeyAlgorithms ^ssh-ed25519&#187;;\n<li class=\"l\"> V ssh-keygen je zabezpe\u010den\u00fd v\u00fdstup koment\u00e1ra pripojen\u00e9ho k k\u013e\u00fa\u010du pri extrakcii verejn\u00e9ho k\u013e\u00fa\u010da z s\u00fakromn\u00e9ho;\n<li class=\"l\"> Do ssh-keygen bola pridan\u00e1 mo\u017enos\u0165 pou\u017e\u00edva\u0165 flag &#171;-v&#187; pri vykon\u00e1van\u00ed oper\u00e1ci\u00ed vyh\u013ead\u00e1vania k\u013e\u00fa\u010dov (napr\u00edklad &#171;ssh-keygen -vF host&#187;), ktor\u00e9ho uvedenie vedie k zobrazeniu preh\u013eadn\u00e9ho podpisu hostite\u013ea;\n<li class=\"l\"> Pridan\u00e1 mo\u017enos\u0165 pou\u017eitia <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/PKCS_8\">PKCS8<\/a><\/noindex> ako alternat\u00edvny form\u00e1t na ukladanie s\u00fakromn\u00fdch k\u013e\u00fa\u010dov na disku. Predvolene sa na\u010falej pou\u017e\u00edva form\u00e1t PEM, zatia\u013e \u010do PKCS8 m\u00f4\u017ee by\u0165 u\u017eito\u010dn\u00e9 na dosiahnutie kompatibility s in\u00fdmi aplik\u00e1ciami.\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=51640\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0448\u0435\u0441\u0442\u0438 \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 8.1, \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\u0442\u0434\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u044f \u0432 \u043d\u043e\u0432\u043e\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u0435 \u0437\u0430\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u0435\u0442 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u044e\u0449\u0435\u0439 ssh, sshd, ssh-add \u0438 ssh-keygen. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 \u043a\u043e\u0434\u0435 \u043f\u0430\u0440\u0441\u0438\u043d\u0433\u0430 \u0437\u0430\u043a\u0440\u044b\u0442\u044b\u0445 \u043a\u043b\u044e\u0447\u0435\u0439 \u0441 \u0442\u0438\u043f\u043e\u043c XMSS \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443 \u0438\u043d\u0438\u0446\u0438\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0446\u0435\u043b\u043e\u0447\u0438\u0441\u043b\u0435\u043d\u043d\u043e\u0435 \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043e\u0442\u043c\u0435\u0447\u0435\u043d\u0430 \u043a\u0430\u043a \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u043c\u0430\u044f, [&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-38754","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One 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