119 lines
5.1 KiB
Diff
119 lines
5.1 KiB
Diff
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From b8711faf92868dc82b1a64e7673740444199b2ca Mon Sep 17 00:00:00 2001
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From: Milan Broz <gmazyland@gmail.com>
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Date: Sun, 25 Jun 2023 23:32:13 +0200
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Subject: [PATCH 2/2] Fix activation of LUKS2 with capi format cipher and
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kernel crypt name.
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While activation of internal cipher algorithms (like aes-generic)
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is disallowed, some old LUKS2 images can still use it.
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Check the cipher in activate call, but allow to load LUKS2 metadata.
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This can allow to add repair code easily and also allow luksDump.
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Also fix segfault in reencrypt code for such a header.
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Fixes: #820
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---
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lib/luks2/luks2_json_metadata.c | 5 +++++
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tests/Makefile.am | 4 +++-
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tests/compat-test2 | 17 ++++++++++++++++-
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tests/luks2_invalid_cipher.img.xz | Bin 0 -> 135372 bytes
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tests/meson.build | 1 +
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5 files changed, 25 insertions(+), 2 deletions(-)
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create mode 100644 tests/luks2_invalid_cipher.img.xz
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diff --git a/lib/luks2/luks2_json_metadata.c b/lib/luks2/luks2_json_metadata.c
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index 2fcc8aa6..b1d0c05d 100644
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--- a/lib/luks2/luks2_json_metadata.c
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+++ b/lib/luks2/luks2_json_metadata.c
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@@ -2605,6 +2605,11 @@ int LUKS2_activate(struct crypt_device *cd,
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if ((r = LUKS2_unmet_requirements(cd, hdr, 0, 0)))
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return r;
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+ /* Check that cipher is in compatible format */
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+ if (!crypt_get_cipher(cd)) {
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+ log_err(cd, _("No known cipher specification pattern detected in LUKS2 header."));
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+ return -EINVAL;
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+ }
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r = dm_crypt_target_set(&dmd.segment, 0, dmd.size, crypt_data_device(cd),
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vk, crypt_get_cipher_spec(cd), crypt_get_iv_offset(cd),
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crypt_get_data_offset(cd), crypt_get_integrity(cd) ?: "none",
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diff --git a/tests/Makefile.am b/tests/Makefile.am
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index c8a46a85..6feaef3b 100644
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--- a/tests/Makefile.am
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+++ b/tests/Makefile.am
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@@ -68,6 +68,7 @@ EXTRA_DIST = compatimage.img.xz compatv10image.img.xz \
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luks2_valid_hdr.img.xz \
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luks2_header_requirements.tar.xz \
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luks2_mda_images.tar.xz \
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+ luks2_invalid_cipher.img.xz \
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evil_hdr-payload_overwrite.xz \
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evil_hdr-stripes_payload_dmg.xz \
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evil_hdr-luks_hdr_damage.xz \
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@@ -110,7 +111,8 @@ EXTRA_DIST = compatimage.img.xz compatv10image.img.xz \
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CLEANFILES = cryptsetup-tst* valglog* *-fail-*.log test-symbols-list.h fake_token_path.so fake_systemd_tpm_path.so
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clean-local:
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- -rm -rf tcrypt-images luks1-images luks2-images bitlk-images fvault2-images conversion_imgs luks2_valid_hdr.img blkid-luks2-pv-img blkid-luks2-pv-img.bcp external-tokens
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+ -rm -rf tcrypt-images luks1-images luks2-images bitlk-images fvault2-images conversion_imgs \
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+ luks2_valid_hdr.img blkid-luks2-pv-img blkid-luks2-pv-img.bcp external-tokens luks2_invalid_cipher.img
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differ_SOURCES = differ.c
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differ_CFLAGS = $(AM_CFLAGS) -Wall -O2
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diff --git a/tests/compat-test2 b/tests/compat-test2
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index c54dc7ea..8b6bb073 100755
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--- a/tests/compat-test2
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+++ b/tests/compat-test2
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@@ -16,6 +16,7 @@ IMG10=luks-test-v10
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HEADER_IMG=luks-header
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HEADER_KEYU=luks2_keyslot_unassigned.img
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HEADER_LUKS2_PV=blkid-luks2-pv.img
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+HEADER_LUKS2_INV=luks2_invalid_cipher.img
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KEY1=key1
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KEY2=key2
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KEY5=key5
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@@ -50,7 +51,9 @@ function remove_mapping()
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[ -b /dev/mapper/$DEV_NAME2 ] && dmsetup remove --retry $DEV_NAME2
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[ -b /dev/mapper/$DEV_NAME ] && dmsetup remove --retry $DEV_NAME
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losetup -d $LOOPDEV >/dev/null 2>&1
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- rm -f $ORIG_IMG $IMG $IMG10 $KEY1 $KEY2 $KEY5 $KEYE $HEADER_IMG $HEADER_KEYU $VK_FILE $HEADER_LUKS2_PV missing-file $TOKEN_FILE0 $TOKEN_FILE1 test_image_* $KEY_FILE0 $KEY_FILE1 >/dev/null 2>&1
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+ rm -f $ORIG_IMG $IMG $IMG10 $KEY1 $KEY2 $KEY5 $KEYE $HEADER_IMG $HEADER_KEYU $VK_FILE \
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+ $HEADER_LUKS2_PV $HEADER_LUKS2_INV missing-file $TOKEN_FILE0 $TOKEN_FILE1 test_image_* \
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+ $KEY_FILE0 $KEY_FILE1 >/dev/null 2>&1
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# unlink whole test keyring
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[ -n "$TEST_KEYRING" ] && keyctl unlink $TEST_KEYRING "@u" >/dev/null
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@@ -1200,5 +1203,17 @@ if [ $HAVE_KEYRING -gt 0 -a -d /proc/sys/kernel/keys ]; then
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$CRYPTSETUP open -q --test-passphrase --token-only --token-id 0 -q $IMG || fail
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fi
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+prepare "[44] LUKS2 invalid cipher (kernel cipher driver name)" wipe
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+xz -dk $HEADER_LUKS2_INV.xz
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+dd if=$HEADER_LUKS2_INV of=$IMG conv=notrunc >/dev/null 2>&1
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+$CRYPTSETUP -q luksDump $LOOPDEV | grep -q "capi:xts(ecb(aes-generic))-plain64" || fail
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+echo $PWD1 | $CRYPTSETUP open $LOOPDEV --test-passphrase || fail
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+echo $PWD1 | $CRYPTSETUP open $LOOPDEV $DEV_NAME 2>&1 | grep -q "No known cipher specification pattern" || fail
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+echo $PWD1 | $CRYPTSETUP reencrypt $LOOPDEV >/dev/null 2>&1 && fail
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+dmsetup create $DEV_NAME --uuid CRYPT-LUKS2-3d20686f551748cb89911ad32379821b-test --table \
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+ "0 8 crypt capi:xts(ecb(aes-generic))-plain64 edaa40709797973715e572bf7d86fcbb9cfe2051083c33c28d58fe4e1e7ff642 0 $LOOPDEV 32768"
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+$CRYPTSETUP status $DEV_NAME | grep -q "n/a" || fail
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+$CRYPTSETUP close $DEV_NAME ||fail
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+
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remove_mapping
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exit 0
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diff --git a/tests/meson.build b/tests/meson.build
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index 00f629f5..7bb3f406 100644
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--- a/tests/meson.build
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+++ b/tests/meson.build
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@@ -21,6 +21,7 @@ test_files_to_copy = [
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'luks2_keyslot_unassigned.img.xz',
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'luks2_mda_images.tar.xz',
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'luks2_valid_hdr.img.xz',
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+ 'luks2_invalid_cipher.img.xz',
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'tcrypt-images.tar.xz',
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'valid_header_file.xz',
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'xfs_512_block_size.img.xz',
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--
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2.40.1
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