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In Jenkins, how can I manually check the signature of plugin updates?

In Jenkins -> Manage Plugins, I observe this message:

There were errors checking the update sites: None of the tool installer metadata passed the signature check

My question is: How can I manually check the signature of updates in order to determine if they are valid?

Subsidiary question, how can I determine the cause of this error?

Solution

  • UPDATE: In the meantime it seems the expired cert has been renewed:

    https://updates.jenkins-ci.org/updates/hudson.tools.JDKInstaller.json.html

    Certificate:
    Data:
        Version: 1 (0x0)
        Serial Number: 3735928570 (0xdeadbefa)
    Signature Algorithm: sha256WithRSAEncryption
        Issuer: C=US, ST=California, L=San Jose, O=Jenkins Project, CN=Kohsuke Kawaguchi/[email protected]
        Validity
            Not Before: Nov 19 21:21:39 2018 GMT
            Not After : Nov 19 21:21:39 2019 GMT
        Subject: C=US, ST=California, O=Jenkins Project, CN=Community Update Center
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (2048 bit)

    So for me the issue seems solved.