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117. TLS / SSL

The Gateway can listen for requests on https by following the usual Spring server configuration. Example:

application.yml. 

server:
  ssl:
    enabled: true
    key-alias: scg
    key-store-password: scg1234
    key-store: classpath:scg-keystore.p12
    key-store-type: PKCS12

Gateway routes can be routed to both http and https backends. If routing to a https backend then the Gateway can be configured to trust all downstream certificates with the following configuration:

application.yml. 

spring:
  cloud:
    gateway:
      httpclient:
        ssl:
          useInsecureTrustManager: true

Using an insecure trust manager is not suitable for production. For a production deployment the Gateway can be configured with a set of known certificates that it can trust with the follwing configuration:

application.yml. 

spring:
  cloud:
    gateway:
      httpclient:
        ssl:
          trustedX509Certificates:
          - cert1.pem
          - cert2.pem

If the Spring Cloud Gateway is not provisioned with trusted certificates the default trust store is used (which can be overriden with system property javax.net.ssl.trustStore).

117.1 TLS Handshake

The Gateway maintains a client pool that it uses to route to backends. When communicating over https the client initiates a TLS handshake. A number of timeouts are assoicated with this handshake. These timeouts can be configured (defaults shown):

application.yml. 

spring:
  cloud:
    gateway:
      httpclient:
        ssl:
          handshake-timeout-millis: 10000
          close-notify-flush-timeout-millis: 3000
          close-notify-read-timeout-millis: 0