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ssl_certificate_validation_issues.md

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SSL Certificate Validation Issues

1 SSL validation fails during the installation process

If the intermediate CA that is used to sign service certificates changes after the NCNs are brought up, then this causes the platform-ca on the NCNs to no longer be valid. This is due to the platform-ca only being pulled via cloud-init on first boot. Run the following Goss test to validate this is the case.

1.1 Error messages

/opt/cray/tests/ncn-resources/hms/hms-test/hms_run_ct_smoke_tests_ncn-resources.sh
{"ID":"x3007c0s12b0","LastDiscoveryStatus":"HTTPsGetFailed"}
{"ID":"x3007c0s15b0","LastDiscoveryStatus":"HTTPsGetFailed"}
{"ID":"x3007c0s16b0","LastDiscoveryStatus":"HTTPsGetFailed"}
FAIL: smd_discovery_status_test found no successfully discovered endpoints
'/opt/cray/tests/ncn-smoke/hms/hms-smd/smd_discovery_status_test_ncn-smoke.sh' exited with status code: 1
curl https://api-gw-services-nmn.local/PATH
curl: (60) SSL certificate problem: self signed certificate in certificate chain
More details here: https://curl.haxx.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.

1.2 Solution

goss -g /opt/cray/tests/install/ncn/tests/goss-platform-ca-certs-match-cloud-init.yaml v

If this test fails, then run the following commands in order to update the platform-ca.

mv /var/lib/ca-certificates/ca-bundle.pem /root/ca-bundle.pem.bak
curl http://10.92.100.71:8888/meta-data | jq -r  '.Global."ca-certs".trusted[]' \
        > /etc/pki/trust/anchors/platform-ca-certs.crt
update-ca-certificates
systemctl restart containerd

Note: This will save a copy of the original CA bundle in /root/ca-bundle.pem.bak. Normally update-ca-certificates will update this file without having to move it. However, there are times when update-ca-certificates fails to update the CA bundle if the file exists.

2 SSL validation only fails in Python applications

2.1 Error messages

python3[3705657]: Unable to contact CFS to report component status: HTTPSConnectionPool(host='api-gw-service-nmn.local', port=443):
Max retries exceeded with url: /apis/cfs/v2/components/XNAME (Caused by SSLError(SSLError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate
verify failed (_ssl.c:852)'),))

Error calling https://api-gw-service-nmn.local/keycloak/realms/shasta/protocol/openid-connect/token: HTTPSConnectionPool(host='api-gw-service-nmn.local', port=443):
Max retries exceeded with url: /keycloak/realms/shasta/protocol/openid-connect/token (Caused by SSLError(SSLError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:852)'),))

2.2 Solution

python3 applications, such as CFS, will fail to validate the API Gateway's SSL certificate if a non-SuSE-provided certifi Python package is used. This is due to the official certifi package using its own CA certificate bundle instead of the system's bundle. This normally happens if pip install is used to install an application with a certifi dependency. To see the version of certifi on the system, run pip show certifi.

pip show certifi
Name: certifi
Version: 2021.10.8
Summary: Python package for providing Mozilla's CA Bundle.
Home-page: https://certifiio.readthedocs.io/en/latest/
Author: Kenneth Reitz
Author-email: me@kennethreitz.com
License: MPL-2.0
Location: /root/.local/lib/python3.6/site-packages/certifi-2021.10.8-py3.6.egg
Requires:
Required-by: canu, kubernetes, requests

If this points to a local directory or is a different version then 2018.1.18 then uninstall this certifi package in order to trust the platform CA. The following command shows the expected output on a CSM v1.3 system.

pip show certifi
Name: certifi
Version: 2018.1.18
Summary: Python package for providing Mozilla's CA Bundle.
Home-page: http://certifi.io/
Author: Kenneth Reitz
Author-email: me@kennethreitz.com
License: MPL-2.0
Location: /usr/lib/python3.6/site-packages
Requires:
Required-by: kubernetes, requests

If certifi is installed in /usr/lib/python3.6/site-packages, then reinstall the certifi RPM that ships with SLES. If this is not possible, run the following commands to replace the ca-bundle that certifi uses with a link to the system's ca-bundle.

CERTIFIDIR="$(pip show certifi | grep Location | awk '{print $2}')/certifi"
mv "$CERTIFIDIR"/cacert.pem "$CERTIFIDIR"/cacert.pem.orig
ln -s /var/lib/ca-certificates/ca-bundle.pem "$CERTIFIDIR"/cacert.pem

3 SSL validation only fails with podman and/or pulling down Kubernetes containers

If the platform CA was not available in the system's CA certificate bundle when containerd started then the system will show SSL validation errors when talking to https://registry.local. This is due to containerd caching the CA bundle on startup.

3.1 Error message

Get https://registry.local/v2/: x509: certificate signed by unknown authority
Error: unable to pull registry.local/IMAGE:TAG: Error initializing source docker://registry.local/IMAGE:TAG: error pinging docker registry
registry.local: Get https://registry.local/v2/: x509: certificate signed by unknown authority

3.2 Resolution of failure pulling containers

Restart the containerd service.

systemctl restart containerd

4 update-ca-certificates fails to add platform-ca to ca-bundle

update-ca-certificates can occasionally fail to add the platform-ca-certs.crt file to the system's ca-bundle.pem. This can cause the same error message as the previous issues. If the previous checks do not show any issues, then try the solution outlined below.

4.1 Error messages

(Caused by SSLError(SSLError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:852)'),))

curl: (60) SSL certificate problem: self signed certificate in certificate chain
More details here: https://curl.haxx.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.

4.2 Solution

Run the following commands on the affected node to regenerate the ca-bundle.pem file with the platform-ca-certs.crt file included.

rm -v /var/lib/ca-certificates/ca-bundle.pem
update-ca-certificates

If these issues are suspected to have caused problems with cfs-state-reporter, then restart the cfs-state-reporter service:

systemctl restart cfs-state-reporter