Remove CA Certificate from System Trust Store¶
Root Certificate Authority (CA) certificates can and do expire. Typically, alternative CAs are available on the system, and often it is the case that a system package update will remove the older expired certificates (for example, the ca-certificates package).
Though infrequent, sometimes an expired Root CA might cause issues (for example, OpenSSL 1.0.2x) and needs to be manually removed from your server trust store.
CentOS 7¶
Note
For CentOS7, there is now an updated package that removes this expired certificate:
yum install ca-certificates
You can then check and confirm this is fixed with:
rpm -q --changelog ca-certificates | grep "DST ROOT CA X3" -B4
* Tue Sep 14 2021 Bob Relyea <rrelyea@redhat.com> - 2021.2.50-72
- Fix expired certificate.
- Removing:
- # Certificate "DST Root CA X3"
Backup the trust store
cp -i /etc/pki/tls/certs/ca-bundle.crt ~/ca-bundle.crt-backup
Identify the CA certificate
trust list
Add certificate to blacklist directory
trust dump --filter "pkcs11:id=%c4%a7%b1%a4%7b%2c%71%fa%db%e1%4b%90%75%ff%c4%15%60%85%89%10" | openssl x509 | tee /etc/pki/ca-trust/source/blacklist/DST-Root-CA-X3.pem
Update the system trust store
update-ca-trust extract
Verify removal
diff ~/ca-bundle.crt-backup /etc/pki/tls/certs/ca-bundle.crt
Sample Output
$ diff ~/ca-bundle.crt-backup /etc/pki/tls/certs/ca-bundle.crt
860,881d859
< # DST Root CA X3
< -----BEGIN CERTIFICATE-----
< MIIDSjCCAjKgAwIBAgIQRK+wgNajJ7qJMDmGLvhAazANBgkqhkiG9w0BAQUFADA/
< MSQwIgYDVQQKExtEaWdpdGFsIFNpZ25hdHVyZSBUcnVzdCBDby4xFzAVBgNVBAMT
< DkRTVCBSb290IENBIFgzMB4XDTAwMDkzMDIxMTIxOVoXDTIxMDkzMDE0MDExNVow
< PzEkMCIGA1UEChMbRGlnaXRhbCBTaWduYXR1cmUgVHJ1c3QgQ28uMRcwFQYDVQQD
< Ew5EU1QgUm9vdCBDQSBYMzCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEB
< AN+v6ZdQCINXtMxiZfaQguzH0yxrMMpb7NnDfcdAwRgUi+DoM3ZJKuM/IUmTrE4O
< rz5Iy2Xu/NMhD2XSKtkyj4zl93ewEnu1lcCJo6m67XMuegwGMoOifooUMM0RoOEq
< OLl5CjH9UL2AZd+3UWODyOKIYepLYYHsUmu5ouJLGiifSKOeDNoJjj4XLh7dIN9b
< xiqKqy69cK3FCxolkHRyxXtqqzTWMIn/5WgTe1QLyNau7Fqckh49ZLOMxt+/yUFw
< 7BZy1SbsOFU5Q9D8/RhcQPGX69Wam40dutolucbY38EVAjqr2m7xPi71XAicPNaD
< aeQQmxkqtilX4+U9m5/wAl0CAwEAAaNCMEAwDwYDVR0TAQH/BAUwAwEB/zAOBgNV
< HQ8BAf8EBAMCAQYwHQYDVR0OBBYEFMSnsaR7LHH62+FLkHX/xBVghYkQMA0GCSqG
< SIb3DQEBBQUAA4IBAQCjGiybFwBcqR7uKGY3Or+Dxz9LwwmglSBd49lZRNI+DT69
< ikugdB/OEIKcdBodfpga3csTS7MgROSR6cz8faXbauX+5v3gTt23ADq1cEmv8uXr
< AvHRAosZy5Q6XkjEGB5YGV8eAlrwDPGxrancWYaLbumR9YbK+rlmM6pZW87ipxZz
< R8srzJmwN0jP41ZL9c8PDHIyh8bwRLtTcm1D9SZImlJnt1ir/md2cXjbDaJWFBM5
< JDGFoqgCWjBH4d1QB7wCCZAA62RjYJsWvIjJEubSfZGL+T0yjWW06XyxV3bqxbYo
< Ob8VZRzI9neWagqNdwvYkQsEjgfbKbYK7p2CNTUQ
< -----END CERTIFICATE-----
<