V\u00fdvoj\u00e1ri OpenSSH pokra\u010dovali v rozde\u013eovan\u00ed sshd na nieko\u013eko samostatn\u00fdch spustite\u013en\u00fdch s\u00faborov. V prvom kroku rozdelenia implementovanom v m\u00e1ji bolo z sshd do samostatn\u00e9ho procesu sshd-session presunut\u00e9 spracovanie rel\u00e1ci\u00ed a v sshd zostala len funkcionalita potrebn\u00e1 na prij\u00edmanie nov\u00e9ho sie\u0165ov\u00e9ho pripojenia a sp\u00fa\u0161\u0165anie sshd-session pre ka\u017ed\u00fa nov\u00fa rel\u00e1ciu. V\u010dera bolo do k\u00f3du OpenSSH pridan\u00e9 \u010fal\u0161ie zmeny, ktor\u00e9 zav\u00e1dzaj\u00fa nov\u00fd proces \u2014 sshd-auth, do ktor\u00e9ho bol z sshd-session presunut\u00fd k\u00f3d vykon\u00e1vaj\u00faci autentifik\u00e1ciu. <\/p>\n
Proces sshd-auth sa sp\u00fa\u0161\u0165a z sshd-session a umo\u017e\u0148uje dodato\u010dne izolova\u0165 \u00fadaje s\u00favisiace s autentifik\u00e1ciou v adresnom priestore samostatn\u00e9ho procesu, \u010do zabr\u00e1ni pr\u00edstupu k t\u00fdmto \u00fadajom v pam\u00e4ti v pr\u00edpade \u00fatokov na k\u00f3d pou\u017e\u00edvan\u00fd na spracovanie f\u00e1z pripojenia pred dokon\u010den\u00edm autentifik\u00e1cie. Okrem toho zmena trochu zn\u00ed\u017ei spotrebu pam\u00e4te, ke\u010f\u017ee k\u00f3d s\u00favisiaci s autentifik\u00e1ciou je teraz pr\u00edtomn\u00fd v pam\u00e4ti len po\u010das vykon\u00e1vania autentifik\u00e1cie a n\u00e1sledne je vymazan\u00fd pri ukon\u010den\u00ed procesu sshd-auth. <\/p>\n
Podobne ako pri sshd, ssh-session a ssh-agent, bola pre proces sshd-auth aplikovan\u00e1 oper\u00e1cia n\u00e1hodn\u00e9ho prekomponovania spustite\u013en\u00e9ho s\u00faboru pri ka\u017edom spusten\u00ed opera\u010dn\u00e9ho syst\u00e9mu. N\u00e1hodn\u00e9 prekomponovanie rob\u00ed posuny funkci\u00ed v spustite\u013en\u00fdch s\u00faboroch a kni\u017eniciach \u0165a\u017eko predv\u00eddate\u013en\u00fdmi, \u010do s\u0165a\u017euje vytv\u00e1ranie exploitov vyu\u017e\u00edvaj\u00facich met\u00f3dy n\u00e1vratovo orientovan\u00e9ho programovania (ROP \u2014 Return-Oriented Programming). Pri pou\u017eit\u00ed techniky ROP sa \u00fato\u010dn\u00edk nesna\u017e\u00ed umiestni\u0165 svoj k\u00f3d do pam\u00e4te, ale operuje u\u017e existuj\u00facimi kusmi strojov\u00fdch in\u0161trukci\u00ed, ktor\u00e9 sa kon\u010dia in\u0161trukciou n\u00e1vratu riadenia (zvy\u010dajne ide o ukon\u010denia funkci\u00ed). Funkcia exploitov spo\u010d\u00edva v budovan\u00ed re\u0165azca volan\u00ed podobn\u00fdch blokov (\u201egadgets\u201c) na dosiahnutie po\u017eadovanej funkcionality. \u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 OpenSSH \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0438\u043b\u0438 \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u0438\u0435 sshd \u043d\u0430 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0438\u0441\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u0445 \u0444\u0430\u0439\u043b\u043e\u0432. \u041d\u0430 \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u0432 \u043c\u0430\u0435 \u043f\u0435\u0440\u0432\u043e\u043c \u044d\u0442\u0430\u043f\u0435 \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0438\u0437 sshd \u0432 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441 sshd-session \u0431\u044b\u043b\u0438 \u0432\u044b\u043d\u0435\u0441\u0435\u043d\u044b \u0444\u0443\u043d\u043a\u0446\u0438\u0438, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0435 \u0441 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u0441\u0435\u0430\u043d\u0441\u043e\u0432, \u0430 \u0432 sshd \u043e\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0430 \u043b\u0438\u0448\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u044c, \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u0430\u044f \u0434\u043b\u044f \u043f\u0440\u0438\u0451\u043c\u0430 \u043d\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0442\u0435\u0432\u043e\u0433\u043e \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0438 \u0437\u0430\u043f\u0443\u0441\u043a\u0430 sshd-session \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u043d\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0430\u043d\u0441\u0430. \u0412\u0447\u0435\u0440\u0430 \u0432 \u043a\u043e\u0434\u043e\u0432\u0443\u044e \u0431\u0430\u0437\u0443 OpenSSH \u0431\u044b\u043b\u043e […]<\/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-120192","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\udd47V OpenSSH je k\u00f3d autentifik\u00e1cie presunut\u00fd do samostatn\u00e9ho procesu sshd-auth | ProHoster","description":"V\u00fdvoj\u00e1ri OpenSSH pokra\u010dovali v delen\u00ed sshd na nieko\u013eko samostatn\u00fdch vykon\u00e1vac\u00edch 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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"