How To Check Certificates In Linux?
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1. Use the openssl command:
The openssl command is a versatile tool for working with SSL/TLS certificates. It can be used to view the contents of a certificate, convert certificates to different formats, and check a certificate’s signature and validity.
To view the contents of a certificate, use the command:
$ openssl x509 -in <certificate-file> -text -noout
2. Use the certtool command:
The certtool command is a part of the GnuTLS suite of tools for working with SSL/TLS certificates. It can be used to view the contents of a certificate, convert certificates to different formats, and check a certificate’s signature and validity.
To view the contents of a certificate, use the command:
$ certtool -i <certificate-file>
3. Use the certutil command:
The certutil command is a part of the NSS (Network Security Services) suite of tools for working with SSL/TLS certificates. It can be used to view the contents of a certificate, convert certificates to different formats, and check a certificate’s signature and validity.
To view the contents of a certificate, use the command:
$ certutil -L -d <certificate-directory> -n <certificate-name>