{"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\/hr\/blog\/administrirovanie\/rasshifrovka-luks-kontejnera-v-moment-zagruzki-sistemy","title":{"rendered":"Dekodiranje LUKS kontejnera pri pokretanju sustava","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Svima dobar dan, ve\u010der! Ova objava \u0107e biti korisna onima koji koriste LUKS enkripciju podataka i \u017eele izvesti dekriptiranje diskova na Linuxu (Debian, Ubuntu) u fazi dekodiranja root particije<\/b>. Takve informacije nisam mogao prona\u0107i na internetu.<\/p>\n

U zadnje vrijeme, s pove\u0107anjem broja diskova u policama, suo\u010dio sam se s problemom dekodiranja diskova koriste\u0107i dobro poznatu metodu preko \/etc\/crypttab. Osobno isti\u010dem nekoliko problema kori\u0161tenja ove metode, a to su da se datoteka \u010dita samo nakon u\u010ditavanja (mount) root-particije<\/b>, \u0161to negativno utje\u010de na uvoz ZFS, posebno ako su sastavljeni iz particija na *_crypt ure\u0111aju, ili mdadm RAID-i, sastavljeni tako\u0111er iz particija. Svi znamo da mo\u017eemo koristiti parted na LUKS kontejnerima?<\/i> I tako\u0111er problem ranog pokretanja drugih usluga, kada jo\u0161 nema nizova, a koristiti<\/b> ve\u0107 ne\u0161to treba (radim s klasteriziranim Proxmox VE 5.x i ZFS preko iSCSI).<\/p>\n

Malo o ZFSoverISCSI<\/b>iSCSI radi preko LIO, a kada se pokrene iSCSI cilj i ne vidi ZVOL ure\u0111aje, jednostavno ih uklanja iz konfiguracije, \u0161to onemogu\u0107ava pokretanje gostuju\u0107ih sustava. Odatle ili vra\u0107anje backupa json datoteke, ili ru\u010dno dodavanje ure\u0111aja s identifikatorima svake VM, \u0161to je jednostavno stra\u0161no kada ima desetine takvih ma\u0161ina, a u konfiguraciji svake vi\u0161e od 1 diska.<\/p>\n

Drugo pitanje koje \u0107u razmotriti je \u010dime provesti dekodiranje (to je klju\u010dna to\u010dka \u010dlanka). O tome \u0107emo razgovarati u nastavku, pridru\u017eite se!
\n<\/a><\/noindex>
\nNaj\u010de\u0161\u0107e se na internetu koristi klju\u010dna datoteka (naravno, prethodno dodana u slot naredbom \u2014 cryptsetup luksAddKey), ili u rijetkim iznimkama (u ruskom jeziku internet ima jako malo informacija) \u2014 skripta decrypt_derived, koja se nalazi u \/lib\/cryptsetup\/script\/ (naravno, postoje jo\u0161 na\u010dini, ali ja sam koristio upravo ova dva, koja su bila osnova \u010dlanka). Tako\u0111er sam te\u017eio potpunom autonomnom pokretanju nakon ponovnog pokretanja, bez dodatnih naredbi u konzoli, kako bi mi sve odmah <\/p>\n

Kre\u0107emo!<\/p>\n

Pretpostavimo sustav, na primjer Debian, instaliran na crypto-particiji sda3_crypt i desetak diskova spremnih za \u0161ifriranje i stvaranje \u0161to god \u017eelimo. Imamo klju\u010dnu frazu (passphrase) za otklju\u010davanje sda3_crypt i upravo s te particije \u0107emo na pokrenutom (de\u0161ifriranom) sustavu uzeti \"hash\" lozinke i dodati ga na ostale diskove. Sve je jednostavno, u konzoli izvr\u0161avamo:<\/p>\n

\/lib\/cryptsetup\/scripts\/decrypt_derived sda3_crypt | cryptsetup luksFormat \/dev\/sdX<\/code><\/pre>\n
\ngdje je X \u2014 to su na\u0161i diskovi, particije itd.<\/p>\n
Nakon \u0161ifriranja diskova \"hashom\" od na\u0161e klju\u010dne fraze, potrebno je saznati UUID ili ID \u2014 ovisno o tome tko \u0161to preferira. Uzeli smo podatke iz \/dev\/disk\/by-uuid i by-id prema tome.<\/p>\n
Sljede\u0107a etapa je priprema datoteka i mini-skripti za rad potrebnih nam funkcija, zapo\u010dinjemo:<\/p>\n
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
\nnadalje<\/p>\n
touch \/etc\/initramfs-tools\/hooks\/decrypt && chmod +x \/etc\/initramfs-tools\/hooks\/decrypt<\/code><\/pre>\n
\nSadr\u017eaj ..\/decrypt<\/b><\/p>\n
#!\/bin\/sh\n\ncp -p \/lib\/cryptsetup\/scripts\/decrypt_derived \"$DESTDIR\/bin\/decrypt_derived\"<\/code><\/pre>\n
nadalje<\/p>\n
touch \/etc\/initramfs-tools\/hooks\/partcopy && chmod +x \/etc\/initramfs-tools\/hooks\/partcopy<\/code><\/pre>\n
\nSadr\u017eaj ..\/partcopy<\/b><\/p>\n
#!\/bin\/sh\n\ncp -p \/sbin\/partprobe \"$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
jo\u0161 malo<\/p>\n
touch \/etc\/initramfs-tools\/scripts\/local-bottom\/partprobe && chmod +x \/etc\/initramfs-tools\/scripts\/local-bottom\/partprobe<\/code><\/pre>\n
\nSadr\u017eaj ..\/partprobe<\/b><\/p>\n
#!\/bin\/sh\n\n$DESTDIR\/bin\/partprobe<\/code><\/pre>\n
i na kraju, prije update-initramfs, potrebno je urediti datoteku \/etc\/initramfs-tools\/scripts\/local-top\/cryptroot, po\u010dev\u0161i od linije ~360, dio koda ispod<\/p>\n
Izvorni tekst<\/b><\/p>\n
\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
i dovedemo ga u ovakav oblik<\/p>\n
Ure\u0111ena verzija<\/b><\/p>\n
\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
Imajte na umu da ovdje mo\u017eete koristiti ili UUID ili ID. Glavno je da su potrebni drajveri za HDD\/SSD ure\u0111aje dodani u \/etc\/initramfs-tools\/modules. Upotrijebite naredbu za saznanje koji drajver se koristi udevadm info -a -n \/dev\/sdX | egrep 'looking|DRIVER'<\/i>.<\/p>\n
Sada, kada smo zavr\u0161ili i svi datoteke su na svom mjestu, pokre\u0107emo update-initramfs -u -k all -v<\/i>, u logiranju ne bi smjelo biti<\/b> gre\u0161aka u izvr\u0161avanju na\u0161ih skripti. Ponovno pokre\u0107emo, unosimo klju\u010dnu frazu i malo \u010dekamo, ovisno o broju diskova. Zatim \u0107e sustav krenuti i u zavr\u0161noj fazi pokretanja, to\u010dnije nakon \u201emontiranja\u201c root-particije, izvr\u0161it \u0107e se naredba partprobe \u2014 ona \u0107e prona\u0107i i povezati sve kreirane particije na LUKS ure\u0111ajima i svi nizovi, bilo da su ZFS ili mdadm, bit \u0107e okupljeni bez problema! I sve to do pokretanja<\/b> glavnih usluga i servisa kojima su potrebni ovi diskovi\/nizovi.<\/p>\n
update1<\/b>: Kao primijetio<\/a><\/noindex> AEP<\/a><\/noindex>, ova metoda radi samo za LUKS1.
\n
Izvor: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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