4.14. Using Shared System Certificates The Shared System Certificates storage allows NSS, GnuTLS, OpenSSL, and Java to share a default source for retrieving system certificate anchors and black list information. By default, the trust store contains the Mozilla CA list, including positive and negative trust. The system allows updating of the core Mozilla CA list or choosing another certificate list. 4.14.1. Using a System-wide Trust Store In Red Hat Enterprise Linux 7, the consolidated system-wide trust store is located in the /etc/pki/ca-trust/ and /usr/share/pki/ca-trust-source/ directories. The trust settings in /usr/share/pki/ca-trust-source/ are processed with lower priority than settings in /etc/pki/ca-trust/ . Certificate files are treated depending on the subdirectory they are installed to: /usr/share/pki/ca-trust-source/anchors/ or /etc/pki/ca-trust/source/anchors/ - for trust anchors. See Section 4.5.6, "Understanding Trust Anchors" . /usr/share/pki/ca-trust-source/blacklist/ or /etc/pki/ca-trust/source/blacklist/ - for distrusted certificates. /usr/share/pki/ca-trust-source/ or /etc/pki/ca-trust/source/ - for certificates in the extended BEGIN TRUSTED file format. 4.14.2. Adding New Certificates To add a certificate in the simple PEM or DER file formats to the list of CAs trusted on the system, copy the certificate file to the /usr/share/pki/ca-trust-source/anchors/ or /etc/pki/ca-trust/source/anchors/ directory. To update the system-wide trust store configuration, use the update-ca-trust command, for example: Note While the Firefox browser is able to use an added certificate without executing update-ca-trust , it is recommended to run update-ca-trust after a CA change. Also note that browsers, such as Firefox, Epiphany, or Chromium, cache files, and you might need to clear the browser's cache or restart your browser to load the current system certificates configuration. 4.14.3. Managing Trusted System Certificates To list, extract, add, remove, or change trust anchors, use the trust command. To see the built-in help for this command, enter it without any arguments or with the --help directive: To list all system trust anchors and certificates, use the trust list command: All sub-commands of the trust commands offer a detailed built-in help, for example: To store a trust anchor into the system-wide trust store, use the trust anchor sub-command and specify a path.to a certificate, for example: To remove a certificate, use either a path.to a certificate or an ID of a certificate: 4.14.4. Additional Resources For more information, see the following man pages: update-ca-trust(8) trust(1)

Commands:
cp ~/certificate-trust-examples/Cert-trust-test-ca.pem /usr/share/pki/ca-trust-source/anchors/ update-ca-trust
trust usage: trust command <args> Common trust commands are: list List trust or certificates extract Extract certificates and trust extract-compat Extract trust compatibility bundles anchor Add, remove, change trust anchors dump Dump trust objects in internal format See 'trust <command> --help' for more information
trust list pkcs11:id=%d2%87%b4%e3%df%37%27%93%55%f6%56%ea%81%e5%36%cc%8c%1e%3f%bd;type=cert type: certificate label: ACCVRAIZ1 trust: anchor category: authority pkcs11:id=%a6%b3%e1%2b%2b%49%b6%d7%73%a1%aa%94%f5%01%e7%73%65%4c%ac%50;type=cert type: certificate label: ACEDICOM Root trust: anchor category: authority [output has been truncated]
trust list --help usage: trust list --filter=<what> --filter=<what> filter of what to export ca-anchors certificate anchors blacklist blacklisted certificates trust-policy anchors and blacklist (default) certificates all certificates pkcs11:object=xx a PKCS#11 URI --purpose=<usage> limit to certificates usable for the purpose server-auth for authenticating servers client-auth for authenticating clients email for email protection code-signing for authenticating signed code 1.2.3.4.5... an arbitrary object id -v, --verbose show verbose debug output -q, --quiet suppress command output
trust anchor path.to/certificate.crt
trust anchor --remove path.to/certificate.crt trust anchor --remove "pkcs11:id=%AA%BB%CC%DD%EE;type=cert"