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Verify the release key with --check-signatures

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The original instructions on how to verify the release signing key used
the `--list-sigs` option for gpg.  However, unlike `--check-signatures`,
the `--list-sigs` option does not verify the authenticity of key
signatures.

See gpg2(1):

    --list-signatures
    --list-sigs
        Same as --list-keys, but the signatures are listed too.
        [...]
        Note that in contrast to --check-signatures the key signatures
        are not verified.
        [...]

    --check-signatures
    --check-sigs
        Same  as  --list-keys, but the key signatures are verified and
        listed too.
        [...]

This updates the documentation to use `--check-signatures` instead.
This commit is contained in:
Hans Jerry Illikainen 2020-07-03 10:11:24 +00:00
parent 931e6b9a50
commit dfd7e5ebe1
No known key found for this signature in database
GPG Key ID: 69AF42E7DFC08031
1 changed files with 11 additions and 4 deletions
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15
project-security/verifying-signatures.md
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@ -169,15 +169,22 @@ There are several ways to get the Release Signing Key for your Qubes release.
The Release Signing Key should be signed by the Qubes Master Signing Key:
$ gpg2 --list-sigs "Qubes OS Release X Signing Key"
$ gpg2 --check-signatures "Qubes OS Release X Signing Key"
pub rsa4096 2017-03-06 [SC]
5817A43B283DE5A9181A522E1848792F9E2795E9
uid [ full ] Qubes OS Release X Signing Key
sig 3 1848792F9E2795E9 2017-03-06 Qubes OS Release X Signing Key
sig DDFA1A3E36879494 2017-03-08 Qubes Master Signing Key
sig!3 1848792F9E2795E9 2017-03-06 Qubes OS Release X Signing Key
sig! DDFA1A3E36879494 2017-03-08 Qubes Master Signing Key
gpg: 2 good signatures
This is just an example, so the output you receive will not look exactly the same.
What matters is that the last line shows that this key is signed by the Qubes Master Signing Key, which verifies the authenticity of the Release Signing Key.
What matters is the line that shows that this key is signed by the Qubes Master
Signing Key with a `sig!` prefix. This verifies the authenticity of the
Release Signing Key. Note that the `!` flag after the `sig` tag is important
because it means that the key signature is valid. A `sig-` prefix would
indicate a bad signature and `sig%` would mean that gpg encountered an error
while verifying the signature.
It is not necessary to independently verify the authenticity of the Release Signing Key.