Fix Warning ResponseCookies - The cookie '.AspNetCore.OpenIdConnect.Nonce.xyz' has set 'SameSite=None' and must also set 'Secure'

            
In Startup.cs add the following snippet in Configure

 public void Configure(IApplicationBuilder app, IWebHostEnvironment env)

        {

            //...

            app.UseCookiePolicy(new CookiePolicyOptions

            {

                Secure = CookieSecurePolicy.Always,

                MinimumSameSitePolicy = SameSiteMode.None

            });

            //...

        }

DevSecOps: Runing ASP .NET Core Applications with minimal privileges in Kubernetes

 

Configure podSecurityContext

Configure the pod to run as nobody/nogroup user as follows:

podSecurityContext: 

  runAsUser: 65534

  fsGroup: 65534

Configure SecurityContext

Configure security context to run with minimal possible privileges:

securityContext: 

  capabilities:

    drop:

    - ALL

    add: 

    - "NET_ADMIN"

  readOnlyRootFilesystem: false

  runAsNonRoot: true

  runAsUser: 65534 # run as the nobody/nogroup user

Run on non standard port

Since we do not have permission to run ports lower tan 1024 (normally assigned by adding capability NET_BIND_SERVICE but this requires root privileges) we have to configure ASP .Net Core to listen to a port above 1024.

env:

- name: ASPNETCORE_URLS

    value: http://+:8080

Zero trust architecture with Istio

Disabling access to services outside the mesh

The following command will restrict all outbound traffic to services defined in the service registry as well as those defined through ServiceEntries:

istioctl install --set meshConfig.outboundTrafficPolicy.mode=REGISTRY_ONLY. 

Enabling access to an URL outside the mesh

apiVersion: networking.istio.io/v1beta1

kind: ServiceEntry

metadata:

  name: moneta-egress

spec:

  hosts:

  - '*.microsoft.com'

  - '*.microsoftonline.com'

  - '*.windows.net'

  location: MESH_EXTERNAL

  ports:

  - name: https

    number: 443

    protocol: HTTPS

  resolution: NONE

Set up the namespace to be secure by default

Enable mTLS in strict mode for a specific namespace

apiVersion: "security.istio.io/v1beta1"

kind: "PeerAuthentication"

metadata:

  name: "default"

spec:

  mtls:

    mode: STRICT

Apply ALLOW NOTHING policy

apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-nothing
spec:
  {}

Creating allow rules for the different components

Create allow rule for the frontend

apiVersion: security.istio.io/v1beta1

kind: AuthorizationPolicy

metadata:

  name: frontend

spec:

  selector:

    matchLabels:

      app.kubernetes.io/name: {{ include "web.name" . }}

  action: ALLOW

  rules:

   - {}

Create allow rule for accounts service

apiVersion: security.istio.io/v1beta1

kind: AuthorizationPolicy

metadata:

  name: {{ include "accounts.name" . }}

spec:

  selector:

    matchLabels:

      app.kubernetes.io/name: {{ include "accounts.name" . }}

  action: ALLOW

  rules:

  - from:

    - source:

        principals: ["cluster.local/ns/moneta/sa/frontend-web"]

    to:

    - operation:

        paths: ["/accounts/*"]

check policies applied 

istioctl x authz check $(kubectl get pods -l app=mssql -n moneta -o jsonpath="{.items[0].metadata.name}").moneta