Istio DR rule SAN override

gistfile1.txt

# TODO destination rules need to be created for any SPIFFE IDs that don't follow the
# format that Istio expects (ns/NAMESPACE/sa/TARGET_POD_SVC_ACCOUNT)
# because ATM Istio defaults to clientside SAN checks that assume that SPIFFE ID format
# and this is not currently configurable - however this should be resolved soonish.
# https://github.com/istio/istio/issues/28712
#
# Additionally, since DestinationRules override Istio's "default automTLS" settings, we need `mode: ISTIO_MUTUAL`
# in each DestRule to tell Istio that even though we have a custom destination config, we still want mTLS.
{{- range .Values.spireIdentities }}
---
apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: {{ .serviceName }}-custom-spire-destrule
spec:
  host: {{ .serviceName }}
  trafficPolicy:
    tls:
      mode: ISTIO_MUTUAL
      subjectAltNames:
      - spiffe://example.org/ns/{{ $.Release.Namespace }}/{{ .serviceName }}
{{- end }}