up vote 6 down vote favorite
3

With the recent upgrade of Firefox 54, my self-signed localhost SSL certificate stopped being trusted.

I've been using a Firefox AutoConfigure script to install this certificate, and the technique has been working successfully for several years. Firefox uses its own certificate store, cert8.db which contains the certificate, verified using Firefox Preferences, Advanced, Certificates, View Certificates, Authorities.

This is reproducible on both MacOS as well as Windows. I've attached a sample certificate for reference. This is identical to one we would install.

What changed in Firefox 54? I've reviewed the changelog and can't find anything specific to how it trusts certificates.

Edit: Link to Firefox bug that most likely introduced this change: firefox #1294580

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
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up vote 0 down vote

What you'll probably want to do is generate another self-signed certificate with the same subject, issuer, and public key as the one you're trying to trust. However, instead of end-entity extensions, you'll want to specify that it's a CA certificate with "basicConstraints:cA" and that it can issue certificates with "keyUsage:cRLSign,keyCertSign". It might also be a good idea to add a nameConstraints extension to restrict it to only apply to a certain set of domains. If you add that certificate to Firefox's trust DB, everything should work as before.

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Thanks although that didn't work for a one-link chain. Here's the new cert: gist.githubusercontent.com/tresf/… Side note... I'm using Java's keytool and nameConstraints doesn't seem to be supported (or not documented) – QZ Support 2 days ago
up vote -1 down vote

so we are using several self-signed certificates in our enterprise environment and suddenly with the update to firefox 54 all users are getting error messages. What is the exact way to let this message disappear? We need the support for self-signed certificates.

Best regards Johannes

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That is not in answer, please don't post additional questions to the answers section. – Konstantin Azizov 2 days ago

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