[yocto] GPG signed package feeds and packages: opkg update fails with "No public key"

[Alejandro del Castillo]

On 08/07/2017 04:51 AM, Andersen, Christian wrote:
> Hello,
> 
> I am trying to sign our ipk-packages and the package feed using GPG. As
> far as I can tell the signatures are correctly generated using this in
> the local.conf:
> 
> INHERIT += "sign_package_feed sign_ipk"
> PACKAGE_FEED_GPG_NAME ?= "73CE8000"
> PACKAGE_FEED_GPG_PASSPHRASE_FILE ?= "/var/lib/jenkins/.gnupg/passwd.txt"
> IPK_GPG_NAME ?= "73CE8000"
> IPK_GPG_PASSPHRASE_FILE ?= "/var/lib/jenkins/.gnupg/passwd.txt"
> GPG_PATH ?= "/var/lib/jenkins/.gnupg"
> 
> The public key is installed using opkg-keyrings and this config:
>  
> OPKG_KEYRING_KEYS = "73CE8000"
> 
> On the target I am able to verify that the public key is available:
> 
> root at scb-anders05:~# opkg-key list
> 
> /etc/opkg/trusted.gpg
> 
> ---------------------
> 
> pub   rsa2048 2017-08-04 [SC]
>       B104E37136084E68203BB2CD5676B9F373CE8000
> uid           [unknown] Company <mail at example.tld>
> sub   rsa2048 2017-08-04 [E]

Have you tried to sign using a key with non-default values? I can't see anything clearly off on your config, other than your key being " [unknown] Company <mail at example.tld>"

> The opkg.conf contains:
> 
> option check_signature 1
> #option check_pkg_signature 1
> option signature_type gpg-asc
> 
> But when I try opkg update I get:
> 
> root at scb-anders05:~# opkg update
> Downloading http://internalhost:8000/puck/pyro-develop/ipk/all/Packages.gz.
> Downloading http://internalhost:8000/puck/pyro-develop/ipk/all/Packages.asc.
> Downloading
> http://internalhost:8000/puck/pyro-develop/ipk/cortexa8hf-neon/Packages.gz.
> Downloading
> http://internalhost:8000/puck/pyro-develop/ipk/cortexa8hf-neon/Packages.asc.
> Downloading http://internalhost:8000/puck/pyro-develop/ipk/scb/Packages.gz.
> Downloading http://internalhost:8000/puck/pyro-develop/ipk/scb/Packages.asc.
> Collected errors:
> 
> * opkg_verify_gpg_signature: Signature status returned error: No public key
> * pkg_src_verify: Signature verification failed for all.
> * opkg_verify_gpg_signature: Signature status returned error: No public key
> * pkg_src_verify: Signature verification failed for cortexa8hf-neon.
> * opkg_verify_gpg_signature: Signature status returned error: No public key
> * pkg_src_verify: Signature verification failed for scb.
> 
> When manually loading the Packages and Packages.asc and verify the
> signature on the target it seems to work:
> 
> root at scb-anders05:~# opkg-key adv --verify Packages.asc Packages
> 
> Executing: gpg --no-options --no-default-keyring --keyring
> /etc/opkg/trusted.gpg --secret-keyring /etc/opkg/secring.gpg
> --trustdb-name /etc/opkg/trustdb.gpg --verify Packages.asc Packages
> 
> gpg: Signature made Fri Aug  4 17:00:52 2017 CEST
> gpg:                using RSA key 5676B9F373CE8000
> gpg: Good signature from "Company <mail at example.tld>" [unknown]
> gpg: WARNING: This key is not certified with a trusted signature!
> gpg:          There is no indication that the signature belongs to the
> owner.
> 
> Primary key fingerprint: B104 E371 3608 4E68 203B  B2CD 5676 B9F3 73CE 8000
> 
> Even after changing the trust-level for the public key to 5 (ultimate),
> opkg update does not accept the signature.
> 
> Does anybody have an idea what’s going on and how I can fix this?


-- 
Cheers,

Alejandro