[PATCH] openwrt-keyring: Only copy sign key for snapshots

Hauke Mehrtens hauke at hauke-m.de
Fri May 14 14:31:27 PDT 2021

On 5/14/21 12:17 PM, Paul Spooren wrote:
> Hi,
> On 5/13/21 1:32 AM, Hauke Mehrtens wrote:
>> Instead of adding all public signature keys from the openwrt-keyring
>> repository only add the key which is used to sign the master feeds.
>> If one of the other keys would be compromised this would not affect
>> users of master snapshot builds.
>> Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
>> ---
> Thanks for working on this.
> I'm still in favor to include a *openwrt-next* key which becomes the 
> signing key for the next release. This way a upgrade step between 
> release branches is possible.

I would prefer to create it closer to the next release.

>> As far as I know the other keys are not compromised, this is just a
>> precaution.
>> I would do similar changes to 21.02 and 19.07 to only add the key which
>> is used for this specific release.
> In case of 19.07 please add 21.02 release keys as well, since it's *the 

> next key*.

Yes, good idea.

>> Instead of adding just this single key, should we add all keys of
>> currently maintained releases like 19.07, 21.02 and master key into all
>> 3 branches?
> How about adding keys like that:
> 19.07: 19.07 + 21.02 keys
> 21.02: 21.02 + openwrt-next keys
> snapshot: snapshot key
> The snapshot key stays the same "forever", it shouldn't be included in 
> releases.
>> The signature verification of sysupgrade images is currently not used as
>> far as I know, so normal we do not need the keys for of other releases.
> If the `ucert` package is installed and the env variable 
> `REQUIRE_IMAGE_SIGNATURE` is set, the images are verified. This should 
> eventually become the default.

How reliable is this working?

Currently we do not ship ucert by default and this is needed to check 
the image signature.

> So ideally we already start shipping the correct keys before activating 

> the extra security measurements.

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