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cryptsetup2 2.6.1 is a new release that supports reencryption of Q4.2 release LUKS2 volumes created at installation.
This is a critical feature for the Qubes OS 4.2 release for added data at rest protection
Cryptsetup 2.6.x internal changes:
- Argon2 used externally and internally: requires a lot of RAM and CPU to derivate passphrase to key validated in key slots.
- This is used to rate limit efficiently bruteforcing of LUKS key slots, requiring each offline brute force attempt to consume ~15-30 seconds per attempt
- OF course, strong passphrases are still recommended, but bruteforcing LUKSv2 containers with Argon2 would require immense time, ram and CPU even to bruteforce low entropy passphrase/PINs.
- passphrase change doesn't permit LUKS key slot specification anymore: key slot rotates (new one consusumed per op: then old one wiped internally. EG: LUKS key slot 1 created, then 0 deleted)
- reencryption doesn't permit old call arguments. No more direct-io; inadmissively slow through AIO (async) calls, need workarounds for good enough perfs (arguments + newer kernel with cloudfare fixes in tree)
cryptsetup 2.6.1 requires:
- lvm2 2.03.23, which is also included in this PR.
- requires libaio, which is also included in this PR (could be hacked out but deep dependency at first sight: left in)
- requires util-linux 2.39
- patches for reproducible builds are included for above 3 packages.
luks-functions was updated to support the new cryptsetup2 version calls/changes
- reencryption happen in direct-io, offline mode and without locking, requiring linux 5.10.9+ to bypass linux queues
- from tests, this is best for performance and reliability in single-user mode
- LUKS container ops now validate Disk Recovery Key (DRK) passphrase prior and DRK key slot prior of going forward if needed, failing early.
- Heads don't expect DRK to be in static key slot anymore, and finds the DRK key slot dynamically.
- If reencrytipn/passphrase change: make sure all LUKS containers on same block device can be unlocked with same DRK
- Reencryption: requires to know which key slot to reencrypt.
- Find LUKS key slot that unlocks with DRK passphrase unlock prior of reencrypt call
- Passphrase change: no slot can be passed, but key slot of DRK rotates.
kexec-seal-key
- TPM LUKS Disk Unlock Key key slots have changed to be set in max slots per LUKS version (LUKSv1:7 /LUKSv2: 31)
- If key slot != default LUKS version's keyslot outside of DRK key slot: prompt the user before wiping that key slot, otherwise wipe automatically
- This takes for granted that the DRK key slot alone is needed on the system and Heads controls the LUKS key slots.
- If user has something else going on, ie: Using USB Security dongle + TPM DUK, then the user will need to say no when wiping keys.
- It was suggested to leave LUKS key slots outside of DRK alone, but then: what to do when all key slots would be used?
- Alternative implementation could be to only prompt users to wipe keyslots other then DRK when key slots are all used (LUKSv1: 0-7, LUKSv2: 0-31)
- But then cleanup would need to happen prior of operations (LUKS passphrase change, TPM DUK setup) and could be problematic.
- LUKS containers now checked to be same LUKS version prior of permitting to set TPM DUK and will refuse to go forward of different versions.
TODO:
- async (AIO) calls are not used. direct-io is used instead. libaio could be hacked out
- this could be subject to future work
Notes:
- time to deprecated legacy boards the do not enough space for the new space requirements
- x230-legacy, x230-legacy-flash, x230-hotp-legacy
- t430-legacy, t430-legacy-flash, t430-hotp-legacy already deprecated
Unrelated:
- typos fixes found along the way
Signed-off-by: Thierry Laurion <insurgo@riseup.net>
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| .. | ||
| bash | ||
| busybox | ||
| cairo | ||
| coreboot | ||
| coreboot-blobs | ||
| cryptsetup | ||
| cryptsetup2 | ||
| dropbear | ||
| e2fsprogs | ||
| exfatprogs | ||
| fbwhiptail | ||
| flashprog | ||
| flashrom | ||
| flashtools | ||
| frotz | ||
| gpg | ||
| gpg2 | ||
| hidapi | ||
| hotp-verification | ||
| io386 | ||
| ioport | ||
| json-c | ||
| kbd | ||
| kexec | ||
| libaio | ||
| libassuan | ||
| libgcrypt | ||
| libgpg-error | ||
| libhidapi-libusb | ||
| libksba | ||
| libnitrokey | ||
| libpng | ||
| libusb | ||
| libusb-compat | ||
| linux | ||
| linuxboot | ||
| lvm2 | ||
| mbedtls | ||
| msrtools | ||
| musl-cross | ||
| ncurses | ||
| newt | ||
| nkstorecli | ||
| npth | ||
| openssl | ||
| pciutils | ||
| pinentry | ||
| pixman | ||
| popt | ||
| powerpc-utils | ||
| purism-blobs | ||
| qrencode | ||
| slang | ||
| tpm2-tools | ||
| tpm2-tss | ||
| tpmtotp | ||
| u-root | ||
| util-linux | ||
| zlib | ||
| zstd | ||