Re: [PATCH v7] ima: add crypto agility support for template-hash algorithm

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On Fri, 2024-04-12 at 11:09 +0200, Enrico Bravi wrote:
> The template hash showed by the ascii_runtime_measurements and
> binary_runtime_measurements is the one calculated using sha1 and there is
> no possibility to change this value, despite the fact that the template
> hash is calculated using the hash algorithms corresponding to all the PCR
> banks configured in the TPM.
> 
> Add the support to retrieve the ima log with the template data hash
> calculated with a specific hash algorithm.
> Add a new file in the securityfs ima directory for each hash algo
> configured in a PCR bank of the TPM. Each new file has the name with
> the following structure:
> 
>         {binary, ascii}_runtime_measurements_<hash_algo_name>
> 
> Legacy files are kept, to avoid breaking existing applications, but as
> symbolic links which point to {binary, ascii}_runtime_measurements_sha1
> files. These two files are created even if a TPM chip is not detected or
> the sha1 bank is not configured in the TPM.
> 
> As example, in the case a TPM chip is present and sha256 is the only
> configured PCR bank, the listing of the securityfs ima directory is the
> following:
> 
> lr--r--r-- [...] ascii_runtime_measurements -> ascii_runtime_measurements_sha1
> -r--r----- [...] ascii_runtime_measurements_sha1
> -r--r----- [...] ascii_runtime_measurements_sha256
> lr--r--r-- [...] binary_runtime_measurements ->
> binary_runtime_measurements_sha1
> -r--r----- [...] binary_runtime_measurements_sha1
> -r--r----- [...] binary_runtime_measurements_sha256
> --w------- [...] policy
> -r--r----- [...] runtime_measurements_count
> -r--r----- [...] violations
> 
> Signed-off-by: Enrico Bravi <enrico.bravi@xxxxxxxxx>
> Signed-off-by: Silvia Sisinni <silvia.sisinni@xxxxxxxxx>
> Reviewed-by: Roberto Sassu <roberto.sassu@xxxxxxxxxx>

Thanks, Enrico.  It's now queued in the next-integrity branch.

Mimi





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