Re: [RAUC] problems verifying a bundle

["Jan Lübbe" <jlu@pengutronix.de>]

Hi,

On Tue, 2020-04-28 at 19:55 +0200, Diego González wrote:
> Hello,
> 
> I am having issues when I try to verify a bundle downloaded on the
> device. I am using rauc 1.3 through the meta-rauc for Yocto. 

We added support for certificate key usage/purpose in 1.3. Is this a
regression compared to 1.2?

> I am running rauc info [name of the bundle].raucb on the device. The
> output I get is the following:
> 
> rauc-Message: 17:24:54.156: Debug log domains: 'all'
> (rauc:528): rauc-DEBUG: 17:24:54.165: input bundle: /var/1/rauc-
> bundle-raspberrypi3-64.raucb
> (rauc:528): rauc-DEBUG: 17:24:54.166: No value for key "max-bundle-
> download-size" in [system] defined - using default value of 8388608
> bytes.
> (rauc:528): rauc-DEBUG: 17:24:54.166: No mount prefix provided, using
> /mnt/rauc/ as default
> rauc-Message: 17:24:54.167: Reading bundle: /var/1/rauc-bundle-
> raspberrypi3-64.raucb
> (rauc:528): GLib-GIO-DEBUG: 17:24:54.170: _g_io_module_get_default:
> Found default implementation local (GLocalVfs) for ?gio-vfs?
> rauc-Message: 17:24:54.173: Verifying bundle... 
> signature verification failed: Verify error:unsupported certificate
> purpose

If you haven't specified check-purpose in your system.conf, I suspect
that you have keyUsage or extendedKeyUsage attributes in your
certificate chain. Could you upload the output of openssl x509 -in
<foo.pem> -text for all certificates somewhere so we can check that?

This looks similar to https://github.com/rauc/rauc/issues/568, but so
far we haven't found the underlying cause with the certificates in that
issue yet.

> I don't really know how to get past this issue. I have included in a
> file the root certificate, intermediate certificate and the
> certificate that corresponds to they key used to sign the bundle. And
> I point to that file with path=/etc/rauc/firmware-keyring.pem in the
> system.conf file.
> 
> previous to doing that I was getting:
> [...]
> signature verification failed: Verify error:unable to get local
> issuer certificate

As you're using an intermediate certificate, that needs to be either
included in the keyring or included with the bundle signature:
https://rauc.readthedocs.io/en/latest/advanced.html#intermediate-certificates

> With regards to the environment variables this is what I am using:
> 
> RAUC_KEY_FILE="/h4-work/certs/rauc/firmware-key.pem"
> RAUC_CERT_FILE="/h4-work/certs/rauc/firmware.pem"
> RAUC_KEYRING_FILE="firmware-keyring.pem" (which is the file that I am
> using on the device)
> 
> I don't really know how to get past this issue, any points would be
> highly appreciated.

The variables look fine.

Regards,
Jan



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