DevFW-CICD/ingress-nginx-helm
6
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions
ingress-nginx-helm/docs/user-guide/tls.md

5.2 KiB
Raw Blame History

TLS

TLS Secrets

Anytime we reference a TLS secret, we mean a PEM-encoded X.509, RSA (2048) secret.

You can generate a self-signed certificate and private key with with:

$ openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ${KEY_FILE} -out ${CERT_FILE} -subj "/CN=${HOST}/O=${HOST}"`

Then create the secret in the cluster via:

kubectl create secret tls ${CERT_NAME} --key ${KEY_FILE} --cert ${CERT_FILE}

The resulting secret will be of type kubernetes.io/tls.

Default SSL Certificate

NGINX provides the option to configure a server as a catch-all with server_name for requests that do not match any of the configured server names. This configuration works without issues for HTTP traffic. In case of HTTPS, NGINX requires a certificate. For this reason the Ingress controller provides the flag --default-ssl-certificate. The secret referred to by this flag contains the default certificate to be used when accessing the catch-all server. If this flag is not provided NGINX will use a self-signed certificate.

For instance, if you have a TLS secret foo-tls in the default namespace, add --default-ssl-certificate=default/foo-tls in the nginx-controller deployment.

SSL Passthrough

The flag --enable-ssl-passthrough enables SSL passthrough feature. By default this feature is disabled

HTTP Strict Transport Security

HTTP Strict Transport Security (HSTS) is an opt-in security enhancement specified through the use of a special response header. Once a supported browser receives this header that browser will prevent any communications from being sent over HTTP to the specified domain and will instead send all communications over HTTPS.

By default the controller redirects (301) to HTTPS if there is a TLS Ingress rule.

To disable this behavior use hsts: "false" in the configuration ConfigMap.

Server-side HTTPS enforcement through redirect

By default the controller redirects (301) to HTTPS if TLS is enabled for that ingress. If you want to disable that behavior globally, you can use ssl-redirect: "false" in the NGINX config map.

To configure this feature for specific ingress resources, you can use the nginx.ingress.kubernetes.io/ssl-redirect: "false" annotation in the particular resource.

When using SSL offloading outside of cluster (e.g. AWS ELB) it may be useful to enforce a redirect to HTTPS even when there is not TLS cert available. This can be achieved by using the nginx.ingress.kubernetes.io/force-ssl-redirect: "true" annotation in the particular resource.

Automated Certificate Management with Kube-Lego

Kube-Lego automatically requests missing or expired certificates from Let's Encrypt by monitoring ingress resources and their referenced secrets. To enable this for an ingress resource you have to add an annotation:

kubectl annotate ing ingress-demo kubernetes.io/tls-acme="true"

To setup Kube-Lego you can take a look at this full example. The first version to fully support Kube-Lego is nginx Ingress controller 0.8.

Default TLS Version and Ciphers

To provide the most secure baseline configuration possible, nginx-ingress defaults to using TLS 1.2 and a secure set of TLS ciphers

Legacy TLS

The default configuration, though secure, does not support some older browsers and operating systems. For instance, 20% of Android phones in use today are not compatible with nginx-ingress's default configuration. To change this default behavior, use a ConfigMap.

A sample ConfigMap to allow these older clients connect could look something like the following:

kind: ConfigMap
apiVersion: v1
metadata:
  name: nginx-config
data:
  ssl-ciphers: "ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA"
  ssl-protocols: "TLSv1 TLSv1.1 TLSv1.2"