nixpkgs/nixos
Moritz Maxeiner 8e74e1fded Replace the current Yubikey PBA implementation with the previous one.
Rationale:
  * The main reason for choosing to implement the PBA in accordance
    with the Yubico documentation was to prevent a MITM-USB-attack
    successfully recovering the new LUKS key.
  * However, a MITM-USB-attacker can read user id and password when
    they were entered for PBA, which allows him to recover the new
    challenge after the PBA is complete, with which he can challenge
    the Yubikey, decrypt the new AES blob and recover the LUKS key.
  * Additionally, since the Yubikey shared secret is stored in the
    same AES blob, after such an attack not only is the LUKS device
    compromised, the Yubikey is as well, since the shared secret
    has also been recovered by the attacker.
  * Furthermore, with this method an attacker could also bruteforce
    the AES blob, if he has access to the unencrypted device, which
    would again compromise the Yubikey, should he be successful.
  * Finally, with this method, once the LUKS key has been recovered
    once, the encryption is permanently broken, while with the previous
    system, the LUKS key itself it changed at every successful boot,
    so recovering it once will not necessarily result in a permanent
    breakage and will also not compromise the Yubikey itself (since
    its secret is never stored anywhere but on the Yubikey itself).

Summary:
The current implementation opens up up vulnerability to brute-forcing
the AES blob, while retaining the current MITM-USB attack, additionally
making the consequences of this attack permanent and extending it to
the Yubikey itself.
2014-02-03 22:50:17 +01:00
..
doc Fixed a code typo in the documentation 2013-12-29 11:43:59 +01:00
gui Move all of NixOS to nixos/ in preparation of the repository merge 2013-10-10 13:28:20 +02:00
lib nixos X tests: wait for logind to link a session to the server 2014-01-22 14:23:56 -05:00
maintainers Don't include the code name in the EBS AMI name 2013-11-19 19:09:48 +01:00
modules Replace the current Yubikey PBA implementation with the previous one. 2014-02-03 22:50:17 +01:00
tests nixos X tests: wait for logind to link a session to the server 2014-01-22 14:23:56 -05:00
COPYING Move all of NixOS to nixos/ in preparation of the repository merge 2013-10-10 13:28:20 +02:00
default.nix Fix nixos-option 2013-10-28 22:45:58 +01:00
README Move all of NixOS to nixos/ in preparation of the repository merge 2013-10-10 13:28:20 +02:00
release-combined.nix Propagate the stableBranch argument 2013-10-31 22:04:26 +01:00
release.nix Drop the new-kernel ISOs 2013-11-07 16:38:57 +01:00

*** NixOS ***

NixOS is a Linux distribution based on the purely functional package
management system Nix.  More information can be found at
http://nixos.org/nixos and in the manual in doc/manual.