{"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\/it\/blog\/administrirovanie\/rasshifrovka-luks-kontejnera-v-moment-zagruzki-sistemy","title":{"rendered":"Decrittazione del contenitore LUKS all'avvio del sistema","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Buongiorno a tutti! Questo post sar\u00e0 utile per coloro che utilizzano la crittografia dei dati LUKS e vogliono eseguire la decrittografia dei dischi su Linux (Debian, Ubuntu) durante <b>la fase di decrittografia della partizione root<\/b>. E non sono riuscito a trovare queste informazioni su Internet.<\/p>\n<p>Recentemente, con l'aumento del numero di dischi sugli scaffali, mi sono trovato di fronte al problema di decrittografare dischi utilizzando un metodo ben noto tramite \/etc\/crypttab. Personalmente, evidenzio alcuni problemi nell'uso di questo metodo, in particolare il fatto che il file viene letto <b>solo dopo il caricamento (mount) della partizione root<\/b>, il che influisce negativamente sull'importazione di ZFS, soprattutto se sono stati assemblati da partizioni su dispositivi *_crypt, oppure raid mdadm, anch'essi assemblati da partizioni. <i>Sappiamo tutti che si pu\u00f2 utilizzare parted sui contenitori LUKS?<\/i> C'\u00e8 anche il problema dell'avvio anticipato di altri servizi, quando i pool non sono ancora disponibili, ma <b>utilizzare<\/b> gi\u00e0 \u00e8 necessario qualcosa (lavoro con Proxmox VE 5.x clusterizzato e ZFS su iSCSI).<\/p>\n<p><b class=\"spoiler_title\">Un po' su ZFS su iSCSI<\/b>iSCSI funziona per me attraverso LIO, e quando iscsi-target si avvia e non vede i dispositivi ZVOL, li rimuove semplicemente dalla configurazione, impedendo il caricamento delle macchine virtuali. Di conseguenza, l'unica soluzione \u00e8 ripristinare il file di backup JSON o aggiungere manualmente i dispositivi con gli identificatori di ciascun VM, il che \u00e8 terribile quando ci sono decine di queste macchine e ciascuna ha pi\u00f9 di un disco nella configurazione.<\/p>\n<p>E la seconda domanda che esaminer\u00f2 \u00e8 con cosa effettuare la decrittazione (questo \u00e8 un punto chiave dell'articolo). E di questo parleremo pi\u00f9 avanti, continuate a leggere!<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nSpesso, su Internet, si utilizza un file chiave (ovviamente precedentemente aggiunto nello slot con il comando \u2014 cryptsetup luksAddKey), oppure in rare eccezioni (in Internet di lingua russa ci sono pochissime informazioni) \u2014 lo script decrypt_derived, situato in \/lib\/cryptsetup\/script\/ (ci sono anche altri metodi, ma ho utilizzato precisamente questi due, che sono alla base dell'articolo). Ho anche mirato a un avvio completamente autonomo dopo i riavvii, senza alcun comando aggiuntivo nella console, cos\u00ec che tutto \u00abpartisse\u00bb subito. Quindi, perch\u00e9 aspettare? \u2014 <\/p>\n<p>Iniziamo!<\/p>\n<p>Immaginaamo un sistema, ad esempio Debian, installato nella partizione crittografata sda3_crypt e una dozzina di dischi pronti per la crittografia e per creare qualsiasi cosa desideri. Abbiamo una frase chiave (passphrase) per sbloccare sda3_crypt e da questa partizione andremo a prelevare l'hash della password dal sistema avviato (decrittografato) e aggiungerlo agli altri dischi. \u00c8 tutto semplice, eseguiamo in console:<\/p>\n<pre><code class=\"plaintext\">\/lib\/cryptsetup\/scripts\/decrypt_derived sda3_crypt | cryptsetup luksFormat \/dev\/sdX<\/code><\/pre>\n<p>\ndove X sono i nostri dischi, partizioni, ecc.<\/p>\n<p>Dopo aver crittografato i dischi con l'hash della nostra frase chiave, \u00e8 necessario conoscere l'UUID o l'ID \u2014 a seconda di chi \u00e8 abituato a cosa. Prendiamo i dati da \/dev\/disk\/by-uuid e by-id rispettivamente.<\/p>\n<p>Il passo successivo \u00e8 preparare i file e gli script minimi per eseguire le funzioni necessarie, procediamo:<\/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>\nproseguendo<\/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\">Contenuto .. \/decrypt<\/b><\/p>\n<pre><code class=\"bash\">#!\/bin\/sh\n\ncp -p \/lib\/cryptsetup\/scripts\/decrypt_derived \"$DESTDIR\/bin\/decrypt_derived\"<\/code><\/pre>\n<p>proseguendo<\/p>\n<pre><code class=\"plaintext\">touch \/etc\/initramfs-tools\/hooks\/partcopy &amp;&amp; chmod +x \/etc\/initramfs-tools\/hooks\/partcopy<\/code><\/pre>\n<p>\n<b class=\"spoiler_title\">Contenuto .. \/partcopy<\/b><\/p>\n<pre><code class=\"bash\">#!\/bin\/sh\n\ncp -p \/sbin\/partprobe \"$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>ancora un po'<\/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\">Contenuto .. \/partprobe<\/b><\/p>\n<pre><code class=\"bash\">#!\/bin\/sh\n\n$DESTDIR\/bin\/partprobe<\/code><\/pre>\n<p>E infine, prima di update-initramfs, \u00e8 necessario modificare il file \/etc\/initramfs-tools\/scripts\/local-top\/cryptroot, a partire dalla riga ~360, come riportato di seguito.<\/p>\n<p><b class=\"spoiler_title\">Originale<\/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>E presentiamo in questo modo.<\/p>\n<p><b class=\"spoiler_title\">Modificato.<\/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>Si prega di notare che qui \u00e8 possibile utilizzare sia UUID che ID. \u00c8 importante che i driver necessari per i dispositivi HDD\/SSD siano stati aggiunti in \/etc\/initramfs-tools\/modules. Per scoprire il driver in uso, \u00e8 possibile utilizzare il comando. <i>udevadm info -a -n \/dev\/sdX | egrep 'looking|DRIVER'<\/i>.<\/p>\n<p>Ora che abbiamo finito e tutti i file sono al loro posto, eseguiamo. <i>update-initramfs -u -k all -v.<\/i>, nel logging. <b>non dovrebbero esserci.<\/b> errori nell'esecuzione dei nostri script. Riavviamo, inseriamo la frase chiave e aspettiamo un po', a seconda del numero di dischi. Successivamente, il sistema si avvier\u00e0 e, nella fase finale di avvio, precisamente dopo il 'mounting' della partizione root, verr\u00e0 eseguito il comando partprobe \u2014 esso trover\u00e0 e collegher\u00e0 tutte le partizioni create sui dispositivi LUKS e qualsiasi array, sia esso ZFS o mdadm, si collegher\u00e0 senza problemi! E tutto ci\u00f2. <b>prima dell'avvio.<\/b> dei servizi e delle applicazioni principali che necessitano di questi dischi\/array.<\/p>\n<p><b>update1<\/b>: Come. <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/457260\/#comment_20315522\">ha notato.<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/users\/aep\/\" class=\"user_link\">AEP.<\/a><\/noindex>, questo metodo funziona solo per LUKS1.<br \/>\n<br \/>Fonte: <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 4.9.10 - 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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Questo post sar\u00e0 utile per chi utilizza la crittografia dei dati LUKS e desidera eseguire la decriptazione dei dischi su Linux (Debian, Ubuntu) durante la fase di decrittazione della partizione root. Non sono riuscito a trovare informazioni di questo tipo online. 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