Ubuntu

Ubuntu – ssl certificate check

Read the SSL Certificate information from a remote server

You may want to monitor the validity of an SSL certificate from a remote server, without having the certificate.crt text file locally on your server? You can use the same openssl for that.

To connect to a remote host and retrieve the public key of the SSL certificate, use the following command.

$ openssl s_client -showcerts -connect ma.ttias.be:443

This will connect to the host ma.ttias.be on port 443 and show the certificate. It’s output looks like this.

$ openssl s_client -showcerts -connect ma.ttias.be:443

-----BEGIN CERTIFICATE-----
MIIEzTCCA7WgAwIBAgISESHAjlbjcoBHxBYXS12oY6VjMA0GCSqGSIb3DQEBCwUA
...
CzgXBhDR3themzPx4jwx2ckNFpNDK/6yQgrKaHTewAAj
-----END CERTIFICATE-----
---
Server certificate
subject=/C=BE/OU=Domain Control Validated/CN=ma.ttias.be
issuer=/C=BE/O=GlobalSign nv-sa/CN=AlphaSSL CA - SHA256 - G2
---

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