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I frequently use the OpenConnect plugin for NetworkManager to access VPN resources. However, each time I activate the VPN profile it asks me if I would like to accept the certificate. Is there a way to pull the remote VPN certificate so I can persistently put it in my trusted certificate store?

I am using nm-applet to do all of this from a nice tray icon, but the command-line equivalent also requests that I accept the certificate.

tldr; How can you requests certificates?

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As openconnect/anyconnect are ssl based, you might try openssl:

: | openssl s_client -connect example.com:443 -prexit 2>/dev/null | sed -n -e '/BEGIN\ CERTIFICATE/,/END\ CERTIFICATE/ p'

the first certificate returned would be the servers, the last certificate would be the ca certificate. you could then copy them to /etc/ssl/certs/ (or similar on arch).

(credits for the command go to: https://stackoverflow.com/questions/7885785/using-openssl-to-get-the-certificate-from-a-server#comment19766982_7886248 )

  • Perfect. That was exactly what I needed. – sherrellbc Aug 19 '16 at 15:58
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    It's more elegant to replace echo "" with :. – reinierpost Mar 22 '18 at 12:35

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