How to Import Remove List archive signing keys on CentOS / RHEL / Fedora RPM based Linux distributions

how-to-import-remove-list-archiving-signing-keys-on-CentOS-RHEL-Fedora-rpm-based-Linux-distros-package
If you  plan to build and distribute  own RPMs securely, it is strongly recommended that all custom RPMs are signed using GNU Privacy Guard (GPG). Generating GPG keys and building GPG-signed packages matching it.
Hence, If you have to deal with some of the RPM based package management Linux distribution like CentOS / RHEL / Fedora etc. you will sooner or later end up in a situation where some of the archive signing keys for a package provided by some of the repositories is missing or it is not matching the keys provided for the RPM repo.

As a result you will be unable to install some package like lets say zabbix-sender or you won't be able to update a certain package to the latest available version, because the Archive Signing key is not found.
The usual naming for a RPM file with a GPG key in is YOUR-RPM-GPG-KEY.

A typical PGP Public key file content looks something like this:
 

—–BEGIN PGP PUBLIC KEY BLOCK—–

Version: GnuPG v1.0.0 (GNU/Linux)

Comment: For info see http://www.gnupg.org

mQGiBDfqVEqRBADBKr3Bl6PO8BQ0H8sJoD6p9U7Yyl7pjtZqioviPwXP+DCWd4u8

HQzcxAZ57m8ssA1LK1Fx93coJhDzM130+p5BG9mYSPShLabR3N1KXdXAYYcowTOM

GxdwYRGr1Spw8QydLhjVfU1VSl4xt6bupPbFJbyjkg5Z3P7BlUOUJmrx3wCgobNV

EDGaWYJcch5z5B1of/41G8kEAKii6q7Gu/vhXXnLS6m15oNnPVybyngiw/23dKjS

ti/PYrrL2J11P2ed0x7zm8v3gLrY0cue1iSba+8glY+p31ZPOr5ogaJw7ZARgoS8

BwjyRymXQp+8Dete0TELKOL2/itDOPGHW07SsVWOR6cmX4VlRRcWB5KejaNvdrE5

4XFtOd04NMgWI63uqZc4zkRa+kwEZtmbz3tHSdWCCE+Y7YVP6IUf/w6YPQFQriWY

FiA6fD10eB+BlIUqIw80EqjsBKmCwvKkn4jg8kibUgj4/TzQSx77uYokw1EqQ2wk

OZoaEtcubsNMquuLCMWijYhGBBgRAgAGBQI36lRyAAoJECGRgM3bQqYOhyYAnj7h

VDY/FJAGqmtZpwVp9IlitW5tAJ4xQApr/jNFZCTksnI+4O1765F7tA==

=3AHZ

—–END PGP PUBLIC KEY BLOCK—–

 

The usual naming for a RPM file with a GPG key in is YOUR-RPM-GPG-KEY
 

1. List RPM gpg keys installed on system

To list all the installed RPM gpg keys on the system do:

rpm -q gpg-pubkey


To get a list of the number of installed keys with verbose info with key description::

rpm -qa gpg-pubkey –qf "%{version}-%{release} %{summary}n"|wc -l

 rpm -qa gpg-pubkey –qf "%{version}-%{release} %{summary}n"
fdb19c98-56fd6333 gpg(Fedora 25 Primary (25) <fedora-25-primary@fedoraproject.org>)
7fac5991-4615767f gpg(Google, Inc. Linux Package Signing Key <linux-packages-keymaster@google.com>)
64dab85d-57d33e22 gpg(Fedora 26 Primary (26) <fedora-26-primary@fedoraproject.org>)
fa7a179a-562bcd6e gpg(RPM Fusion nonfree repository for Fedora (25) <rpmfusion-buildsys@lists.rpmfusion.org>)
6806a9cb-562bce39 gpg(RPM Fusion free repository for Fedora (25) <rpmfusion-buildsys@lists.rpmfusion.org>)
d38b4796-570c8cd3 gpg(Google Inc. (Linux Packages Signing Authority) <linux-packages-keymaster@google.com>)

 

[root@host ~:]# rpm -q gpg-pubkey –qf '%{NAME}-%{VERSION}-%{RELEASE}t%{SUMMARY}n'
gpg-pubkey-f4a80eb5-53a7ff4b    gpg(CentOS-7 Key (CentOS 7 Official Signing Key) )
gpg-pubkey-b6792c39-53c4fbdd    gpg(CentOS-7 Debug (CentOS-7 Debuginfo RPMS) )
gpg-pubkey-8fae34bd-538f1e51    gpg(CentOS-7 Testing (CentOS 7 Testing content) )

To list all OS installed gpg keys do:

[user@host ~:]$ $ rpm -qa | grep -i gpg
gpg-pubkey-db42a60e-37ea5438


2. Import RPM-GPG-KEY


A new key be it official archive keys issued from Fedora or a custom own build RPM package can be imported Redhat Package Manager like so:

[root@host ~:]# rpm –import RPM-GPG-KEY


It is possible to also import multiple GPG signature keys, for example on CentOS the usual path containg keys is /etc/pki/rpm-gpg/ to import all of the contained files there:

[root@host ~:]# rpm –import /etc/pki/rpm-gpg/*


3. Check package with imported gpg arch key


Once the RPM-GPG-KEY is imported you can compare whether a RPM package matches with the key signature.

[root@host ~:]# rpm –checksig package-1.3-3.src.rpm

[root@host ~:]# rpm –checksig xtoolwait-1.3-3.src.rpm
package-1.3-3.src.rpm: (sha1) dsa sha1 md5 gpg OK


4. Remove RPM installed arch key


If you have installed some gpg arch. key by mistake and you need to remove it:

[root@host ~:]#rpm -e gpg-pubkey-b6792c39-53c4fbdd


To make sure it is remove do a Listing once again signing archive keys, it should not show anymore:

[root@host ~:]# rpm -q gpg-pubkey –qf '%{NAME}-%{VERSION}-%{RELEASE}t%{SUMMARY}n'
gpg-pubkey-f4a80eb5-53a7ff4b    gpg(CentOS-7 Key (CentOS 7 Official Signing Key) )
gpg-pubkey-8fae34bd-538f1e51    gpg(CentOS-7 Testing (CentOS 7 Testing content) )

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