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cert_management.md

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Linux Cert Management

The easy way to manage certificates is navigate to chrome://settings/certificates. Then click on the "Manage Certificates" button. This will load a built-in interface for managing certificates.

On Linux, Chromium uses the NSS Shared DB. If the built-in manager does not work for you then you can configure certificates with the NSS command line tools.

Details

Get the tools

  • Debian/Ubuntu: sudo apt install libnss3-tools
  • Fedora: sudo dnf install nss-tools
  • Gentoo: su -c "echo 'dev-libs/nss utils' >> /etc/portage/package.use && emerge dev-libs/nss" (You need to launch all commands below with the nss prefix, e.g., nsscertutil.)
  • Opensuse: sudo zypper install mozilla-nss-tools

List all certificates

certutil -d sql:$HOME/.pki/nssdb -L

List details of a certificate

certutil -d sql:$HOME/.pki/nssdb -L -n <certificate nickname>

Add a certificate

certutil -d sql:$HOME/.pki/nssdb -A -t <TRUSTARGS> -n <certificate nickname> \
-i <certificate filename>

The TRUSTARGS are three strings of zero or more alphabetic characters, separated by commas. They define how the certificate should be trusted for SSL, email, and object signing, and are explained in the certutil docs or Meena's blog post on trust flags.

For example, to trust a root CA certificate for issuing SSL server certificates, use

certutil -d sql:$HOME/.pki/nssdb -A -t "C,," -n <certificate nickname> \
-i <certificate filename>

To import an intermediate CA certificate, use

certutil -d sql:$HOME/.pki/nssdb -A -t ",," -n <certificate nickname> \
-i <certificate filename>

Note: to trust a self-signed server certificate, we should use

certutil -d sql:$HOME/.pki/nssdb -A -t "P,," -n <certificate nickname> \
-i <certificate filename>

Add a personal certificate and private key for SSL client authentication

Use the command:

pk12util -d sql:$HOME/.pki/nssdb -i PKCS12_file.p12

to import a personal certificate and private key stored in a PKCS #12 file. The TRUSTARGS of the personal certificate will be set to "u,u,u".

Delete a certificate

certutil -d sql:$HOME/.pki/nssdb -D -n <certificate nickname>