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  • How to sign a key using gpg key (password or password-less) to an rpm in Linux

    In my last article I had shared the steps to build an rpm from scratch

    How to build a signed rpm from scratch by building a source archive using Red Hat Linux

    In this article I will share the steps to sign GPG key to an rpm


    Step 1: Generate GPG key

    Execute the below command to generate the key. You can select they key type and bit size as per your requirements.

    The highlighted options will be prompted for an input
    # gpg --gen-key
    gpg (GnuPG) 2.0.22; Copyright (C) 2013 Free Software Foundation, Inc.
    This is free software: you are free to change and redistribute it.
    There is NO WARRANTY, to the extent permitted by law.

    gpg: directory `/root/.gnupg' created
    gpg: new configuration file `/root/.gnupg/gpg.conf' created
    gpg: WARNING: options in `/root/.gnupg/gpg.conf' are not yet active during this run
    gpg: keyring `/root/.gnupg/secring.gpg' created
    gpg: keyring `/root/.gnupg/pubring.gpg' created
    Please select what kind of key you want:
       (1) RSA and RSA (default)
       (2) DSA and Elgamal
       (3) DSA (sign only)
       (4) RSA (sign only)
    Your selection?
    RSA keys may be between 1024 and 4096 bits long.
    What keysize do you want? (2048)
    Requested keysize is 2048 bits
    Please specify how long the key should be valid.
             0 = key does not expire
          <n>  = key expires in n days
          <n>w = key expires in n weeks
          <n>m = key expires in n months
          <n>y = key expires in n years
    Key is valid for? (0)
    Key does not expire at all
    Is this correct? (y/N)

    GnuPG needs to construct a user ID to identify your key.

    Real name: GoLinuxHub
    Email address: golinuxhub1@gmail.com
    Comment: Test
    You selected this USER-ID:
        "GoLinuxHub (Test) <golinuxhub1@gmail.com>"

    Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? O
    You need a Passphrase to protect your secret key.

    You don't want a passphrase - this is probably a *bad* idea!
    I will do it anyway.  You can change your passphrase at any time,
    using this program with the option "--edit-key".

    We need to generate a lot of random bytes. It is a good idea to perform
    some other action (type on the keyboard, move the mouse, utilize the
    disks) during the prime generation; this gives the random number
    generator a better chance to gain enough entropy.
    gpg: /root/.gnupg/trustdb.gpg: trustdb created
    gpg: key 5CC4FA77 marked as ultimately trusted
    public and secret key created and signed.

    gpg: checking the trustdb
    gpg: 3 marginal(s) needed, 1 complete(s) needed, PGP trust model
    gpg: depth: 0  valid:   1  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 1u
    pub   2048R/5CC4FA77 2018-05-12
          Key fingerprint = 9CDE 27AC C1DD C0F9 8377  F5A9 A605 65CD 5CC4 FA77
    uid                  GoLinuxHub (Test) <golinuxhub1@gmail.com>
    sub   2048R/17D27D49 2018-05-12

    Here below are the important details for me
    GPG Name: GoLinuxHub
    GPG Key : 5CC4FA77






    2. Export Public Key

    Export your public key from your key ring to a text file
    # gpg --export -a '5CC4FA77' > /root/RPM-GPG-KEY-deepak


    3. Import your public key to your RPM DB

    # rpm --import /root/RPM-GPG-KEY-deepak


    4. Configure your rpmmacros file

    Create (if not already exists) rpmmacros file in your home folder and add below content
    # vim /root/.rpmmacros
    %_gpg_path /root/.gnupg
    %_gpg_name GoLinuxHub


    5. Add Sign

    Next you need to add signature to your rpm
    # rpm --resign /tmp/rpmbuild/RPMS/x86_64/deepak-1.0.0-1.x86_64.rpm
    Enter pass phrase:
    Pass phrase is good.
    /tmp/rpmbuild/RPMS/x86_64/deepak-1.0.0-1.x86_64.rpm:

    OR you can also execute below command
    # rpm --addsign /tmp/rpmbuild/RPMS/x86_64/deepak-1.0.0-1.x86_64.rpm
    Enter pass phrase:
    Pass phrase is good.
    /tmp/rpmbuild/RPMS/x86_64/deepak-1.0.0-1.x86_64.rpm:


    6. Check Signature

    Next validate your signature on the rpm you just assigned
    # rpm --checksig /tmp/rpmbuild/RPMS/x86_64/deepak-1.0.0-1.x86_64.rpm
    /tmp/rpmbuild/RPMS/x86_64/deepak-1.0.0-1.x86_64.rpm: sha1 md5 OK

    OR you can use below command to validate the same
    # rpm -K /tmp/rpmbuild/RPMS/x86_64/deepak-1.0.0-1.x86_64.rpm
    /tmp/rpmbuild/RPMS/x86_64/deepak-1.0.0-1.x86_64.rpm: sha1 md5 OK


    7. Build rpm with signature

    If you plan to build any more rpms then you can assign signature while building the same using below command
    # rpmbuild -ba --sign /tmp/rpmbuild/SPECS/deepak.spec

    Below article explains in detail with

    Step by Step guide on how to build a signed rpm from scratch by building a source archive using Red Hat Linux

    I hope the article was useful.

    Deepak Prasad

    Deepak Prasad is a techie and an author who is still trying to survive in this IT generation with very little knowledge he has on Linux/Unix, VMware, SAN Storage, Automation, networking etc

    You can follow him on Facebook or Google+

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    How to sign a key using gpg key (password or password-less) to an rpm in Linux How to sign a key using gpg key (password or password-less) to an rpm in Linux Reviewed by Deepak Prasad on Sunday, May 13, 2018 Rating: 5

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