search

sgan81 / apfs-fuse

FUSE driver for APFS (Apple File System)
GNU General Public License v2.0
1.79k stars 164 forks source link

FileVault and CoreStorage encrypted volumes that have been converted to APFS fail 'Rfc3394_KeyUnwrap' in KeyMgmt.cpp #163

Open arcticforensics opened 2 years ago

arcticforensics commented 2 years ago

The 'Rfc3394_KeyUnwrap' function in 'KeyMgmt.cpp' returns false (a != rfc_3394_default_iv) when calling 'KeyManager::GetVolumeKey' for an APFS volume converted from FileVault/CoreStorage. If the 'Rfc3394_KeyUnwrap' function parameter 'aes_mode' is substituted with 'AES::AES_128', it works!

sgan81 commented 1 year ago

In which key unwrap call did you put these changes?

Mehrtuerer commented 5 months ago

The 'Rfc3394_KeyUnwrap' function in 'KeyMgmt.cpp' returns false (a != rfc_3394_default_iv) when calling 'KeyManager::GetVolumeKey' for an APFS volume converted from FileVault/CoreStorage. If the 'Rfc3394_KeyUnwrap' function parameter 'aes_mode' is substituted with 'AES::AES_128', it works!

This comment saved me and made it work for me. The line where I had to change it, is the one, where the VEK is decoded, once a KEK has been successfully decoded: i.e. this one: if (veke.hdr.info.flags & 2) { // AES-128. This method is used for FileVault and CoreStorage encrypted // volumes that have been converted to APFS. rc = Rfc3394_KeyUnwrap(vek, veke.wrapped_vek, 0x10, kek, kek_mode, &iv);

to

if (veke.hdr.info.flags & 2) { // AES-128. This method is used for FileVault and CoreStorage encrypted // volumes that have been converted to APFS. rc = Rfc3394_KeyUnwrap(vek, veke.wrapped_vek, 0x10, kek, AES::AES_128, &iv);

Right now this is KeyMgmt.cpp:537