{"id":35652,"date":"2019-10-31T22:05:33","date_gmt":"2019-10-31T19:05:33","guid":{"rendered":"https:\/\/prohoster.info\/blog\/rasshifrovka-luks-kontejnera-v-moment-zagruzki-sistemy\/"},"modified":"2019-10-31T22:05:33","modified_gmt":"2019-10-31T19:05:33","slug":"rasshifrovka-luks-kontejnera-v-moment-zagruzki-sistemy","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/administrirovanie\/rasshifrovka-luks-kontejnera-v-moment-zagruzki-sistemy","title":{"rendered":"Deszyfrowanie kontenera LUKS w momencie uruchamiania systemu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Witam wszystkich wspaniale, dzie\u0144 dobry, noc! Ten post b\u0119dzie przydatny dla tych, kt\u00f3rzy u\u017cywaj\u0105 szyfrowania danych LUKS i chc\u0105 przeprowadza\u0107 deszyfrowanie dysk\u00f3w na systemie Linux (Debian, Ubuntu) na <b>etapie deszyfrowania partycji root<\/b>. Takiej informacji nie mog\u0142em znale\u017a\u0107 w internecie.<\/p>\n<p>Niedawno, w miar\u0119 zwi\u0119kszania liczby dysk\u00f3w w magazynach, natkn\u0105\u0142em si\u0119 na problem deszyfrowania dysk\u00f3w przy u\u017cyciu znanej metody przez \/etc\/crypttab. Osobi\u015bcie wyr\u00f3\u017cniam kilka problem\u00f3w zwi\u0105zanych z u\u017cywaniem tej metody, a mianowicie to, \u017ce plik jest odczytywany <b>tylko po za\u0142adowaniu (mount) partycji root<\/b>, co negatywnie wp\u0142ywa na import ZFS, w szczeg\u00f3lno\u015bci je\u015bli by\u0142y zbudowane z partycji na urz\u0105dzeniu *_crypt, lub mdadm raidy, r\u00f3wnie\u017c zbudowane z partycji. <i>Wszyscy wiemy, \u017ce mo\u017cna u\u017cywa\u0107 parted na kontenerach LUKS?<\/i> Pojawia si\u0119 r\u00f3wnie\u017c problem wczesnego uruchamiania innych us\u0142ug, gdy tablice jeszcze nie istniej\u0105, a <b>ju\u017c trzeba co\u015b wykorzysta\u0107 (pracuj\u0119 z klastrowym Proxmox VE 5.x i ZFS over iSCSI).<\/b> Troch\u0119 o ZFSoverISCSI<\/p>\n<p><b class=\"spoiler_title\">iSCSI dzia\u0142a u mnie przez LIO, a tak naprawd\u0119, kiedy uruchamia si\u0119 cel iscsi i nie widzi urz\u0105dze\u0144 ZVOL, po prostu je usuwa z konfiguracji, co uniemo\u017cliwia uruchomienie system\u00f3w go\u015bcinnych. St\u0105d albo przywracanie kopii zapasowej pliku json, albo r\u0119czne dodawanie urz\u0105dze\u0144 z identyfikatorami ka\u017cdej VM, co jest po prostu przera\u017caj\u0105ce, gdy takich maszyn jest dziesi\u0105tki i w konfiguracji ka\u017cdej jest wi\u0119cej ni\u017c 1 dysk.<\/b>A drugie pytanie, kt\u00f3re rozwa\u017c\u0119, to czym przeprowadza\u0107 deszyfrowanie (to kluczowy moment artyku\u0142u). O tym porozmawiamy poni\u017cej, zapraszam do lektury!<\/p>\n<p>Najcz\u0119\u015bciej w internecie u\u017cywa si\u0119 pliku klucza (oczywi\u015bcie dodanego wcze\u015bniej do slotu poleceniem \u2014 cryptsetup luksAddKey), albo w rzadkich przypadkach (w rosyjskiej sieci informacji jest bardzo ma\u0142o) \u2014 skryptu decrypt_derived, znajduj\u0105cego si\u0119 w \/lib\/cryptsetup\/script\/ (oczywi\u015bcie s\u0105 jeszcze inne sposoby, ale u\u017cy\u0142em tych dw\u00f3ch, co stanowi fundament artyku\u0142u). D\u0105\u017cy\u0142em te\u017c do pe\u0142nego autonomicznego uruchamiania po restarcie, bez jakichkolwiek dodatkowych polece\u0144 w konsoli, \u017ceby wszystko \u201ewskakiwa\u0142o\u201d od razu. Dlatego, po co czeka\u0107? \u2014<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nZaczynamy! <\/p>\n<p>Przyst\u0119pujemy!<\/p>\n<p>Zak\u0142adamy system, na przyk\u0142ad Debian, zainstalowany na partycji szyfrowanej sda3_crypt oraz dziesi\u0119\u0107 dysk\u00f3w gotowych do szyfrowania i tworzenia czego dusza zapragnie. Mamy fraz\u0119 kluczow\u0105 (passphrase) do odblokowania sda3_crypt i to z tej partycji b\u0119dziemy na uruchomionym (odszyfrowanym) systemie pobiera\u0107 \u201ehash\u201d has\u0142a i dodawa\u0107 go na pozosta\u0142e dyski. Wszystko jest proste, w konsoli wykonujemy:<\/p>\n<pre><code class=\"plaintext\">\/lib\/cryptsetup\/scripts\/decrypt_derived sda3_crypt | cryptsetup luksFormat \/dev\/sdX<\/code><\/pre>\n<p>\ngdzie X to nasze dyski, partycje itd.<\/p>\n<p>Po zaszyfrowaniu dysk\u00f3w \u201ehashem\u201d z naszej frazy kluczowej, nale\u017cy sprawdzi\u0107 UUID lub ID \u2014 w zale\u017cno\u015bci od preferencji. Pobieramy dane z \/dev\/disk\/by-uuid i by-id odpowiednio.<\/p>\n<p>Nast\u0119pny etap to przygotowanie plik\u00f3w i mini-skrypt\u00f3w do realizacji potrzebnych nam funkcji, przyst\u0119pujemy do dzia\u0142ania:<\/p>\n<pre><code class=\"plaintext\">cp -p \/usr\/share\/initramfs-tools\/hooks\/cryptroot \/etc\/initramfs-tools\/hooks\/\ncp -p \/usr\/share\/initramfs-tools\/scripts\/local-top\/cryptroot \/etc\/initramfs-tools\/scripts\/local-top\/<\/code><\/pre>\n<p>\ndalej<\/p>\n<pre><code class=\"plaintext\">touch \/etc\/initramfs-tools\/hooks\/decrypt &amp;&amp; chmod +x \/etc\/initramfs-tools\/hooks\/decrypt<\/code><\/pre>\n<p>\n<b class=\"spoiler_title\">Zawarto\u015b\u0107 ..\/decrypt<\/b><\/p>\n<pre><code class=\"bash\">#!\/bin\/sh\n\ncp -p \/lib\/cryptsetup\/scripts\/decrypt_derived \"$DESTDIR\/bin\/decrypt_derived\"<\/code><\/pre>\n<p>dalej<\/p>\n<pre><code class=\"plaintext\">touch \/etc\/initramfs-tools\/hooks\/partcopy &amp;&amp; chmod +x \/etc\/initramfs-tools\/hooks\/partcopy<\/code><\/pre>\n<p>\n<b class=\"spoiler_title\">Zawarto\u015b\u0107 ..\/partcopy<\/b><\/p>\n<pre><code class=\"bash\">#!\/bin\/sh\n\ncp -p \/sbin\/partprobe \"$DESTDIR\/bin\/partprobe\"\ncp -p \/lib\/x86_64-linux-gnu\/libparted.so.2 \"$DESTDIR\/lib\/x86_64-linux-gnu\/libparted.so.2\"\ncp -p \/lib\/x86_64-linux-gnu\/libreadline.so.7 \"$DESTDIR\/lib\/x86_64-linux-gnu\/libreadline.so.7\"<\/code><\/pre>\n<p>jeszcze troch\u0119<\/p>\n<pre><code class=\"plaintext\">touch \/etc\/initramfs-tools\/scripts\/local-bottom\/partprobe &amp;&amp; chmod +x \/etc\/initramfs-tools\/scripts\/local-bottom\/partprobe<\/code><\/pre>\n<p>\n<b class=\"spoiler_title\">Zawarto\u015b\u0107 ..\/partprobe<\/b><\/p>\n<pre><code class=\"bash\">#!\/bin\/sh\n\n$DESTDIR\/bin\/partprobe<\/code><\/pre>\n<p>i na koniec, przed update-initramfs, nale\u017cy zedytowa\u0107 plik \/etc\/initramfs-tools\/scripts\/local-top\/cryptroot, zaczynaj\u0105c od linii ~360, poni\u017cszy fragment kodu<\/p>\n<p><b class=\"spoiler_title\">Orygina\u0142<\/b><\/p>\n<pre><code class=\"bash\">\n                # decrease $count by 1, apparently last try was successful.\n                count=$(( $count - 1 ))\n                \n                message \"cryptsetup ($crypttarget): set up successfully\"\n                break\n<\/code><\/pre>\n<p>i przekszta\u0142camy go do takiej postaci<\/p>\n<p><b class=\"spoiler_title\">Zredagowany<\/b><\/p>\n<pre><code class=\"bash\">\n                # decrease $count by 1, apparently last try was successful.\n                count=$(( $count - 1 ))\n                \n\n                \/bin\/decrypt_derived $crypttarget | cryptsetup luksOpen \/dev\/disk\/by-uuid\/ *CRYPT_MAP*\n                \/bin\/decrypt_derived $crypttarget | cryptsetup luksOpen \/dev\/disk\/by-id\/ *CRYPT_MAP*\n\n                message \"cryptsetup ($crypttarget): set up successfully\"\n                break<\/code><\/pre>\n<p>Zauwa\u017c, \u017ce mo\u017cna tutaj u\u017cywa\u0107 zar\u00f3wno UUID, jak i ID. Wa\u017cne, aby odpowiednie sterowniki do dysk\u00f3w HDD\/SSD by\u0142y dodane do \/etc\/initramfs-tools\/modules. U\u017cy\u0107 mo\u017cna polecenia, aby pozna\u0107 u\u017cywany sterownik <i>udevadm info -a -n \/dev\/sdX | egrep 'looking|DRIVER'<\/i>.<\/p>\n<p>Teraz, kiedy sko\u0144czyli\u015bmy i wszystkie pliki s\u0105 na miejscu, uruchamiamy <i>update-initramfs -u -k all -v<\/i>, w logowaniu <b>nie powinno by\u0107<\/b> b\u0142\u0119d\u00f3w wykonania naszych skrypt\u00f3w. Restartujemy, wpisujemy fraz\u0119 kluczow\u0105 i czekamy chwil\u0119, w zale\u017cno\u015bci od liczby dysk\u00f3w. Nast\u0119pnie system uruchomi si\u0119, a na ko\u0144cowym etapie uruchamiania, a mianowicie po \u201ezamontowaniu\u201d partycji root, zostanie wykonane polecenie partprobe \u2014 znajdzie ono i pod\u0142\u0105czy wszystkie stworzone partycje na urz\u0105dzeniach LUKS oraz jakiekolwiek macierze, czy to ZFS, czy mdadm, skomponuj\u0105 si\u0119 bez problem\u00f3w! I to wszystko <b>przed za\u0142adowaniem<\/b> g\u0142\u00f3wnych us\u0142ug i serwis\u00f3w, kt\u00f3re wymagaj\u0105 tych dysk\u00f3w\/macierzy.<\/p>\n<p><b>update1<\/b>: Jak <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/457260\/#comment_20315522\">zauwa\u017cy\u0142em<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/users\/aep\/\" class=\"user_link\">AEP<\/a><\/noindex>, ta metoda dzia\u0142a tylko dla LUKS1.<br \/>\n<br \/>\u0179r\u00f3d\u0142o: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/457260\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u0441\u0435\u043c \u0434\u043e\u0431\u0440\u043e\u0433\u043e \u0434\u043d\u044f, \u043d\u043e\u0447\u0438! \u042d\u0442\u043e\u0442 \u043f\u043e\u0441\u0442 \u0431\u0443\u0434\u0435\u0442 \u043f\u043e\u043b\u0435\u0437\u0435\u043d \u0442\u0435\u043c, \u043a\u0442\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442 \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0434\u0430\u043d\u043d\u044b\u0445 LUKS \u0438 \u0445\u043e\u0447\u0435\u0442 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u044c decrypt\u0434\u0435\u0448\u0438\u0444\u0440\u043e\u0432\u043a\u0443 \u0434\u0438\u0441\u043a\u043e\u0432 \u043f\u043e\u0434 Linux (Debian, Ubuntu) \u043d\u0430 \u0441\u0442\u0430\u0434\u0438\u0438 \u0440\u0430\u0441\u0448\u0438\u0444\u0440\u043e\u0432\u043a\u0438 root \u0440\u0430\u0437\u0434\u0435\u043b\u0430. \u0418 \u0442\u0430\u043a\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u0432 \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442\u0435 \u044f \u043d\u0430\u0439\u0442\u0438 \u043d\u0435 \u0441\u043c\u043e\u0433. \u0421\u043e\u0432\u0441\u0435\u043c \u043d\u0435\u0434\u0430\u0432\u043d\u043e \u0441 \u0443\u0432\u0435\u043b\u0438\u0447\u0435\u043d\u0438\u0435\u043c \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u0430 \u0434\u0438\u0441\u043a\u043e\u0432 \u0432 \u043f\u043e\u043b\u043a\u0430\u0445, \u0441\u0442\u043e\u043b\u043a\u043d\u0443\u043b\u0441\u044f \u0441 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u043e\u0439 \u0440\u0430\u0441\u0448\u0438\u0444\u0440\u043e\u0432\u043a\u0438 \u0434\u0438\u0441\u043a\u043e\u0432 \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u0431\u043e\u043b\u0435\u0435 \u0447\u0435\u043c \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e\u0433\u043e [&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":[688],"tags":[],"class_list":["post-35652","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412\u0441\u0435\u043c \u0434\u043e\u0431\u0440\u043e\u0433\u043e \u0434\u043d\u044f, \u043d\u043e\u0447\u0438! 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