Megjelent az OpenSSH 8.8, a SSH 2.0 \u00e9s SFTP protokollokhoz k\u00e9sz\u00fclt kliens \u00e9s szerver ny\u00edlt forr\u00e1s\u00fa implement\u00e1ci\u00f3ja. A kiad\u00e1s legfontosabb \u00fajdons\u00e1ga, hogy alap\u00e9rtelmez\u00e9s szerint letiltott\u00e1k az RSA kulcsokra alapozott digit\u00e1lis al\u00e1\u00edr\u00e1sok haszn\u00e1lat\u00e1t, amely SHA-1 hashel\u00e9ssel m\u0171k\u00f6d\u00f6tt («ssh-rsa»). <\/p>\n
Az «ssh-rsa» al\u00e1\u00edr\u00e1sok t\u00e1mogat\u00e1s\u00e1nak megsz\u00fcntet\u00e9se a prefiksus \u00fctk\u00f6z\u00e9si t\u00e1mad\u00e1sok hat\u00e9konys\u00e1g\u00e1nak n\u00f6veked\u00e9s\u00e9vel magyar\u00e1zhat\u00f3 (az \u00fctk\u00f6z\u00e9s megkeres\u00e9s\u00e9nek k\u00f6lts\u00e9ge k\u00f6r\u00fclbel\u00fcl 50 ezer doll\u00e1rra tehet\u0151). Az «ssh-rsa» haszn\u00e1lat\u00e1nak tesztel\u00e9s\u00e9hez pr\u00f3b\u00e1ljon meg ssh-n kereszt\u00fcl csatlakozni az «-oHostKeyAlgorithms=-ssh-rsa» opci\u00f3val. Az RSA al\u00e1\u00edr\u00e1sok, amelyek SHA-256 \u00e9s SHA-512 hashel\u00e9ssel m\u0171k\u00f6dnek (rsa-sha2-256\/512), amelyeket az OpenSSH 7.2 \u00f3ta t\u00e1mogatnak, v\u00e1ltozatlanok maradtak. <\/p>\n
A legt\u00f6bb esetben az «ssh-rsa» t\u00e1mogat\u00e1s\u00e1nak megsz\u00fcntet\u00e9se nem ig\u00e9nyel k\u00e9zi beavatkoz\u00e1st a felhaszn\u00e1l\u00f3k r\u00e9sz\u00e9r\u0151l, mivel az OpenSSH kor\u00e1bban alap\u00e9rtelmezetten aktiv\u00e1lta az UpdateHostKeys be\u00e1ll\u00edt\u00e1st, amely automatikusan \u00e1tir\u00e1ny\u00edtja a klienseket megb\u00edzhat\u00f3bb algoritmusokra. A migr\u00e1ci\u00f3hoz a «hostkeys@openssh.com» protokoll kiterjeszt\u00e9st alkalmazz\u00e1k, amely lehet\u0151v\u00e9 teszi szerverhez<\/a> az autentik\u00e1ci\u00f3t k\u00f6vet\u0151en a kliens t\u00e1j\u00e9koztat\u00e1s\u00e1t a k\u00e9sz\u00fcl\u00e9kekhez el\u00e9rhet\u0151 \u00f6sszes kulcsr\u00f3l. Ha olyan r\u00e9gi OpenSSH verzi\u00f3kkal rendelkez\u0151 g\u00e9pekhez csatlakozik, amelyekn\u00e9l a kliens oldal\u00e1n r\u00e9gi verzi\u00f3k futnak, akkor kiv\u00e9telesen vissza\u00e1ll\u00edthat\u00f3 az «ssh-rsa» al\u00e1\u00edr\u00e1sok haszn\u00e1lata, ha a ~\\ .ssh\\ config f\u00e1jlba a k\u00f6vetkez\u0151t adja hozz\u00e1: Host r\u00e9gi_g\u00e9p_neve HostkeyAlgorithms +ssh-rsa \tPubkeyAcceptedAlgorithms +ssh-rsa <\/p>\n Az \u00faj verzi\u00f3ban szint\u00e9n orvosolt\u00e1k a biztons\u00e1gi probl\u00e9m\u00e1t, amely abb\u00f3l ad\u00f3dott, hogy az sshd 6.2-es kiad\u00e1s\u00e1t\u00f3l kezdve helytelen\u00fcl inicializ\u00e1lt\u00e1k a felhaszn\u00e1l\u00f3i csoportot a AuthorizedKeysCommand \u00e9s AuthorizedPrincipalsCommand ir\u00e1nyelvekben megadott parancsok v\u00e9grehajt\u00e1sakor. A megadott ir\u00e1nyelveknek m\u00e1s felhaszn\u00e1l\u00f3k\u00e9nt kellene v\u00e9grehajtaniuk a parancsokat, de val\u00f3j\u00e1ban \u00f6r\u00f6k\u00f6lt\u00e9k az sshd ind\u00edt\u00e1sakor haszn\u00e1lt csoportok list\u00e1j\u00e1t. Ez a viselked\u00e9s bizonyos rendszerszint\u0171 be\u00e1ll\u00edt\u00e1sok mellett potenci\u00e1lisan lehet\u0151v\u00e9 tette a fut\u00f3 feldolgoz\u00f3 sz\u00e1m\u00e1ra, hogy tov\u00e1bbi jogosults\u00e1gokat szerezzen a rendszerben. <\/p>\n A megjegyz\u00e9sben a leg\u00fajabb kiad\u00e1sra vonatkoz\u00f3an figyelmeztet\u00e9s jelent meg a scp alap\u00e9rtelmezett \u00e1tv\u00e1lt\u00e1si sz\u00e1nd\u00e9k\u00e1r\u00f3l SFTP-re, a r\u00e9gi SCP\/RCP protokoll helyett. Az SFTP haszn\u00e1lata sor\u00e1n el\u0151re meghat\u00e1rozott n\u00e9vkezel\u00e9si m\u00f3dszerek alkalmazand\u00f3k, \u00e9s nem haszn\u00e1l glob-mint\u00e1k feldolgoz\u00e1s\u00e1t a f\u00e1jlnevekben, amelyek m\u00e1sik host k\u00f6rnyezet\u00e9ben biztons\u00e1gi probl\u00e9m\u00e1kat okozhatnak. K\u00fcl\u00f6n\u00f6sen, amikor az SCP \u00e9s RCP alkalmaz\u00e1sra ker\u00fcl. szerver<\/a> meg\u00edt\u00e9li, hogy mely f\u00e1jlokat \u00e9s k\u00f6nyvt\u00e1rakat k\u00fcldj\u00f6n el a kliensnek, m\u00edg a kliens csak ellen\u0151rzi a visszak\u00fcld\u00f6tt objektumnevek helyess\u00e9g\u00e9t, ami sor\u00e1n, ha a kliens oldal\u00e1n nem t\u00f6rt\u00e9nnek megfelel\u0151 ellen\u0151rz\u00e9sek, a szerver m\u00e1s f\u00e1jlneveket is \u00e1tadhat, elt\u00e9rve a k\u00e9rt nevekt\u0151l. Az SFTP protokoll mentes ezekt\u0151l a probl\u00e9m\u00e1kt\u00f3l, de nem t\u00e1mogatja a speci\u00e1lis el\u00e9r\u00e9si utak, p\u00e9ld\u00e1ul a «~\\» felfed\u00e9s\u00e9t. A ny\u00fajtott k\u00fcl\u00f6nbs\u00e9g orvosl\u00e1s\u00e1ra az OpenSSH legut\u00f3bbi kiad\u00e1s\u00e1ban \u00faj SFTP protokoll kiterjeszt\u00e9st javasoltak a ~\\ \u00e9s ~user\\ el\u00e9r\u00e9si utak felfed\u00e9s\u00e9re. \u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.8, \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. \u0412\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u0435\u043d \u043e\u0442\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\u043c \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u0445 \u043f\u043e\u0434\u043f\u0438\u0441\u0435\u0439 \u043d\u0430 \u0431\u0430\u0437\u0435 RSA-\u043a\u043b\u044e\u0447\u0435\u0439 \u0441 \u0445\u044d\u0448\u0435\u043c SHA-1 («ssh-rsa»). \u041f\u0440\u0435\u043a\u0440\u0430\u0449\u0435\u043d\u0438\u0435 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 \u043f\u043e\u0434\u043f\u0438\u0441\u0435\u0439 «ssh-rsa» \u043e\u0431\u0443\u0441\u043b\u043e\u0432\u043b\u0435\u043d\u043e \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u0435\u043c \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e\u0441\u0442\u0438 \u043a\u043e\u043b\u043b\u0438\u0437\u0438\u043e\u043d\u043d\u044b\u0445 \u0430\u0442\u0430\u043a \u0441 \u0437\u0430\u0434\u0430\u043d\u043d\u044b\u043c \u043f\u0440\u0435\u0444\u0438\u043a\u0441\u043e\u043c (\u0441\u0442\u043e\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u0434\u0431\u043e\u0440\u0430 \u043a\u043e\u043b\u043b\u0438\u0437\u0438\u0438 \u043e\u0446\u0435\u043d\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e \u0432 50 \u0442\u044b\u0441\u044f\u0447 \u0434\u043e\u043b\u043b\u0430\u0440\u043e\u0432). \u0414\u043b\u044f […]<\/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-101430","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Az OpenSSH 8.8 kiad\u00e1sa deaktiv\u00e1lta az rsa-sha digit\u00e1lis al\u00e1\u00edr\u00e1sok t\u00e1mogat\u00e1s\u00e1t | ProHoster","description":"Megjelent az OpenSSH 8.8 kiad\u00e1sa, az SSH 2.0 \u00e9s SFTP protokollokhoz val\u00f3 ny\u00edlt forr\u00e1sk\u00f3d\u00fa kliens \u00e9s szerver implement\u00e1ci\u00f3j\u00e1nak.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/reliz-openssh-8-8-s-otklyucheniem-podderzhki-czifrovyh-podpisej-rsa-sha","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","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 8.8 \u0441 \u043e\u0442\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\u043c \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u0445 \u043f\u043e\u0434\u043f\u0438\u0441\u0435\u0439 rsa-sha | ProHoster","og:description":"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.8, \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 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Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"