Network Security Services

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Network Security Services (NSS) is a set of libraries designed to support cross-platform development of security-enabled client and server applications.

Applications built with NSS can support SSL v2 and v3, TLS, PKCS #5, #7, PKCS #11, PKCS #12, S/MIME, X.509 v3 certificates, and other security standards.

NSS is required by many packages, including, for example, Chromium and Firefox.


Install the nss package.


Use certutil utility provided with NSS to manage your certificates.

List certificate DB

To get list of all certificates:

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

To get details about certificate:

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

Generate an RSA private key

$ certutil -G -d database_directory -g keysize -n nickname

Generate a certificate signing request

$ certutil -S -s subject -n nickname -x -t C,C,C -o file

Generate a self-signed certificate

$ certutil -S -s subject -n nickname -x -t C,C,C -o file

Import certificate

To add a certificate specify the -A option:

$ certutil -d sql:$HOME/.pki/nssdb -A -t "TRUSTARGS" -n certificate_nickname -i /path/to/cert/filename

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

To add a personal certificate and private key for SSL client authentication use the command:

$ pk12util -d sql:$HOME/.pki/nssdb -i /path/to/PKCS12/cert/filename.p12

This will 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".

Edit certificate

Call certutil with -M option to edit the certificate. For example, to edit the TRUSTARGS:

$ certutil -d sql:$HOME/.pki/nssdb -M -t "TRUSTARGS" -n certificate_nickname

Delete certificate

Use -D option to remove the certificate:

$ certutil -d sql:$HOME/.pki/nssdb -D -n certificate_nickname

See also