linux-kernel - Re: [PATCH v2] tpm_tis: Remove the HID IFX0102

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Message-ID: <20200702233757.GG31291@linux.intel.com>
Date:   Fri, 3 Jul 2020 02:37:57 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     James Bottomley <James.Bottomley@...senPartnership.com>
Cc:     Jerry Snitselaar <jsnitsel@...hat.com>,
        linux-integrity@...r.kernel.org,
        "Ferry Toth :" <ferry.toth@...inga.info>,
        Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...l.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] tpm_tis: Remove the HID IFX0102

On Fri, Jun 26, 2020 at 07:36:31AM -0700, James Bottomley wrote:
> On Fri, 2020-06-26 at 16:15 +0300, Jarkko Sakkinen wrote:
> > I have an obstacle with that.
> > 
> > I lost my previous PGP key a year ago and created a new one, which is
> > not trusted yet by anyone [*]. I've backed this up now and have it
> > stored inside Nitrokey Pro 2 in order to prevent this happening
> > again.
> 
> I wouldn't do that.  If the nitro key gets lost or breaks, you'll be in
> the same position.  Best practice is to have your key offline somewhere
> in a secure vault (like an encrypted USB key in a bank vault) so you
> can restore in case of loss and then present inside a token (so I use
> the TPM2 for mine).

I have a backup too.

> 
> > Now the problem is that in order to get a kernel.org account, I need
> > to be in the web of trust of the kernel maintainers.
> > 
> > I can request an accunt only after I see face to face another kernel
> > maintainers, so that I can proof that I am I.
> > 
> > [*] http://keys.gnupg.net/pks/lookup?op=get&search=0x3AB05486C7752FE1
> 
> Well, I would sign this and send it back to you, except I can't.  The
> verification procedures require an encrypted email and you don't have a
> working encryption key:
> 
> gpg --export -a 3AB05486C7752FE1 | gpg --encrypt -r 3AB05486C7752FE1 -a --output 3AB05486C7752FE1.gpg 
> gpg: 3AB05486C7752FE1: skipped: Unusable public key
> gpg: [stdin]: encryption failed: Unusable public key
> 
> The reason is your main key is certification only (as is should be):
> 
> pub  rsa4096/3AB05486C7752FE1
>      created: 2019-06-24  expires: 2023-06-24  usage: C   
>      trust: unknown       validity: full
> 
> but your only encryption subkey is revoked:
> 
> sub  rsa2048/3A4EC6E56FDD3158
>      created: 2019-06-25  revoked: 2019-10-22  usage: E   
> 
> You seem to have only one unrevoked, unexpired subkey which is an
> authentication one, so you wouldn't even be able to sign with that key:
> 
> sub  rsa2048/962F0565523E5DC5
>      created: 2019-06-26  expires: 2021-06-25  usage: A   
> 
> James
> 

pub   rsa4096 2019-06-24 [C] [expires: 2023-06-24]
      5107E66D34788A93E3227C903AB05486C7752FE1
      uid           [ultimate] Jarkko Sakkinen <jarkko.sakkinen@....fi>
      uid           [ultimate] Jarkko Sakkinen
      <jarkko.sakkinen@...ux.intel.com>
      sub   ed25519 2019-06-25 [S] [expires: 2021-06-24]
      sub   rsa2048 2019-06-26 [A] [expires: 2021-06-25]

There's also a signing key.

/Jarkko