linux-kernel - Re: Migration to trusted keys: sealing user-provided key?

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Date:   Sun, 31 Jan 2021 09:29:29 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Jan Lübbe <jlu@...gutronix.de>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Ahmad Fatoum <a.fatoum@...gutronix.de>,
        James Bottomley <jejb@...ux.ibm.com>,
        David Howells <dhowells@...hat.com>, keyrings@...r.kernel.org,
        Sumit Garg <sumit.garg@...aro.org>
Cc:     linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, kernel@...gutronix.de
Subject: Re: Migration to trusted keys: sealing user-provided key?

On Sun, 2021-01-31 at 15:14 +0100, Jan Lübbe wrote:
> On Sun, 2021-01-31 at 07:09 -0500, Mimi Zohar wrote:

<snip>

> > 
> > [1] The ima-evm-utils README contains EVM examples of "trusted" and
> > "user" based "encrypted" keys.
> 
> I assume you refer to
> https://sourceforge.net/p/linux-ima/ima-evm-utils/ci/master/tree/README#l143
> "Generate EVM encrypted keys" and "Generate EVM trusted keys (TPM based)"?
> 
> In both cases, the key used by EVM is a *newly generated* random key. The only
> difference is whether it's encrypted to a user key or a (random) trusted key.
 
The "encrypted" asymmetric key data doesn't change, "update" just
changes the key under which it is encrypted/decrypted.

Usage::

    keyctl add encrypted name "new [format] key-type:master-key-name
keylen"
        ring
    keyctl add encrypted name "load hex_blob" ring
    keyctl update keyid "update key-type:master-key-name"

Mimi