https://bugs.kde.org/show_bug.cgi?id=465551
Bug ID: 465551
Summary: E-Mail signed with gnupg subkey not properly shown as
valid when opened in composer/preview pane
Classification: Applications
Product: kmail2
Version: 5.22.1
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: message list
Assignee: kdepim-b...@kde.org
Reporter: s.we...@web.de
Target Milestone: ---
SUMMARY
I'm using gnupg with an subkey to sign my e-mails.
KMail shows following message when a e-mail was signed with the gnugp subkey:
"Not enough information to check signature validity."
Details message:
"Message was signed on <date> with unknown key <keyfingerprint>.
The validity of the signature cannot be verified.
Status: Good signature"
Expected
STEPS TO REPRODUCE
1. Create e-mail in composer, with signing active (using an gnupg key with an
signing only subkey)
2. save e-mail as draft
3. Open draft email
OBSERVED RESULT
KMail shows an orange border with following message when a e-mail was signed
with the gnugp subkey:
"Not enough information to check signature validity."
Details message:
"Message was signed on <date> with unknown key <keyfingerprint>.
The validity of the signature cannot be verified.
Status: Good signature"
EXPECTED RESULT
Showing an green border
SOFTWARE/OS VERSIONS
KDE KMail Version: 5.22.1 (22.12.1)
KDE Frameworks Version: 5.101.0
Qt Version: 5.15.8
ADDITIONAL INFORMATION
The log output when "Write server mode logs to FILE" is configured shows
following Information when the signed e-mail is opened:
2023-02-10 17:06:11 gpg[1848451] armor: BEGIN PGP SIGNATURE
2023-02-10 17:06:11 gpg[1848451] Signature made Do 22 Dez 2022 11:53:36 CET
2023-02-10 17:06:11 gpg[1848451] using RSA key <keyfingerprint>
2023-02-10 17:06:11 gpg[1848451] using subkey <subkeyid> instead of primary key
<primarykeyid>
2023-02-10 17:06:11 gpg[1848451] using subkey <subkeyid> instead of primary key
<primarykeyid>
2023-02-10 17:06:11 gpg[1848451] using classic trust model
2023-02-10 17:06:11 gpg[1848451] key <primarykeyid>: accepted as trusted key
2023-02-10 17:06:11 gpg[1848451] Good signature from "<name + e-mail address>"
[ultimate]
2023-02-10 17:06:11 gpg[1848451] using subkey <subkeyid> instead of primary key
<primarykeyid>
2023-02-10 17:06:11 gpg[1848451] binary signature, digest algorithm SHA256, key
algorithm rsa4096
2023-02-10 17:06:11 gpg[1848454] using character set 'utf-8'
2023-02-10 17:06:11 gpg[1848454] using classic trust model
2023-02-10 17:06:11 gpg[1848454] key <primarykeyid>: accepted as trusted key
So gnupg itself uses the subkey to verify the signature
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