linux-kernel - Re: [PATCH RESEND] docs: update trusted-encrypted.rst

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Date:   Sun, 16 Aug 2020 12:06:30 -0400
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     Coly Li <colyli@...e.de>, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Dan Williams <dan.j.williams@...el.com>,
        James Bottomley <jejb@...ux.ibm.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Mimi Zohar <zohar@...ux.ibm.com>
Subject: Re: [PATCH RESEND] docs: update trusted-encrypted.rst

On 8/15/20 3:51 AM, Coly Li wrote:
> The parameters in tmp2 commands are outdated, people are not able to
> create trusted key by the example commands.
>
> This patch updates the paramerters of tpm2 commands, they are verified
> by tpm2-tools-4.1 with Linux v5.8 kernel.
>
> Signed-off-by: Coly Li <colyli@...e.de>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: James Bottomley <jejb@...ux.ibm.com>
> Cc: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> Cc: Mimi Zohar <zohar@...ux.ibm.com>
> Cc: Stefan Berger <stefanb@...ux.ibm.com>
> ---
>   Documentation/security/keys/trusted-encrypted.rst | 9 ++++-----
>   1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/security/keys/trusted-encrypted.rst b/Documentation/security/keys/trusted-encrypted.rst
> index 9483a7425ad5..442a2775156e 100644
> --- a/Documentation/security/keys/trusted-encrypted.rst
> +++ b/Documentation/security/keys/trusted-encrypted.rst
> @@ -39,10 +39,9 @@ With the IBM TSS 2 stack::
>   
>   Or with the Intel TSS 2 stack::
>   
> -  #> tpm2_createprimary --hierarchy o -G rsa2048 -o key.ctxt
> +  #> tpm2_createprimary --hierarchy o -G rsa2048 key.ctxt
>     [...]
> -  handle: 0x800000FF


Are you sure about this? My documentation for 4.1.3 on F32 states


-c, --key-context=FILE:

          The file path to save the object context of the generated 
primary object.



> -  #> tpm2_evictcontrol -c key.ctxt -p 0x81000001
> +  #> tpm2_evictcontrol -c key.ctxt 0x81000001
>     persistentHandle: 0x81000001


This seems correct.


>   
>   Usage::
> @@ -115,7 +114,7 @@ append 'keyhandle=0x81000001' to statements between quotes, such as


A note in this file states this:

Note: When using a TPM 2.0 with a persistent key with handle 0x81000001,
append 'keyhandle=0x81000001' to statements between quotes, such as
"new 32 keyhandle=0x81000001".

Now if someone was (still) interested in TPM 1.2 then the below changes 
you are proposing wouldn't work for them. Maybe you should adapt the 
note to state that these keyhandle=... should be removed for the TPM 1.2 
case.

>   
>   ::
>   
> -    $ keyctl add trusted kmk "new 32" @u
> +    $ keyctl add trusted kmk "new 32 keyhandle=0x81000001" @u
>       440502848
>   
>       $ keyctl show
> @@ -138,7 +137,7 @@ append 'keyhandle=0x81000001' to statements between quotes, such as
>   
>   Load a trusted key from the saved blob::
>   
> -    $ keyctl add trusted kmk "load `cat kmk.blob`" @u
> +    $ keyctl add trusted kmk "load `cat kmk.blob` keyhandle=0x81000001" @u
>       268728824
>   
>       $ keyctl print 268728824