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Having difficulty visiting an mTLS-authenticated website from GrapheneOS [SOLVED] (lemmy.thewooskeys.com)

submitted 2 months ago* (last edited 2 months ago) by mike_wooskey@lemmy.thewooskeys.com to c/selfhosted@lemmy.world

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I host a website that uses mTLS for authentication. I created a client cert and installed it in Firefox on Linux, and when I visit the site for the first time, Firefox asks me to choose my cert and then I'm able to visit the site (and every subsequent visit to the site is successful without having to select the cert each time). This is all good.

But when I install that client cert into GrapheneOS (settings -> encryption & credentials -> install a certificate -> vpn & app user certificate), no browser app seems to recognize that it exists at all. Visiting the website from Vanadium, Fennec, or Mull browsers all return "ERR_BAD_SSL_CLIENT_AUTH_CERT" errors.

Does anyone have experience successfully using an mTLS cert in GrapheneOS?

[SOLVED] Thanks for the solution, @Evkob@lemmy.ca

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[–] mike_wooskey@lemmy.thewooskeys.com 3 points 2 months ago* (last edited 2 months ago)

[SOLVED!] That Stack Exchange post was the solution! I had to ask ChatGPT for assistance (e.g., "how do I view the contents of a .crt and a .p12?", "how do I add a CA to a client cert?"), but it worked. Thanks for your help, @Evkob@lemmy.ca.

I don't think I would have ever thought that my client cert didn't contain the CA, especially because when I clicked on the client cert that was installed in GrapheneOS, it showed me a summary that said it did contain a CA! grrrr

(tagging @one_knight_scripting@lemmy.world as he wanted to know the solution)