When the client connection is mTLS (Mutual TLS), forward the XFCC header in the request. ENUM_VALUEĭo not send the XFCC header to the next hop. Where ENUM_VALUE can be of the following type.
To configure how XFCC headers are handled, set forwardClientCertDetails in your IstioOperator apiVersion: /v1alpha1 Sanitize/append/forward the XFCC header before proxying the request. Or proxies that a request has flowed through, on its way from the client to the server. X-forwarded-client-cert (XFCC) is a proxy header which indicates certificate information of part or all of the clients Run the following curl command to simulate a request with proxy addresses in the X-Forwarded-For header: $ curl -s -H 'X-Forwarded-For: 56.5.6.7, 72.9.5.6, 98.1.2.3' "$GATEWAY_URL"/get?show_env=true You can also configure both of these settings by adding the /config annotation to the Pod spec For example, to configure globally during install or upgrade when using an IstioOperator custom resource: spec: Configuring network topologiesĬonfiguration of XFF and XFCC headers can be set globally for all gateway workloads via MeshConfig or per gateway usingĪ pod annotation. This becomes ever more vital as Istio multicluster deployment models become more common.įor more information on X-Forwarded-For, see the IETF’s RFC. Of architectures mentioned above, reasonable defaults are not able to be shipped that support the proper forwarding ofĬlient attributes to the destination workloads. While Istio provides an ingress gateway, given the varieties Today’s networks vary widely in nature, but support for these attributes is a requirement no matter what the network topology is.Īnd forwarded whether the network uses cloud-based Load Balancers, on-premise Load Balancers, gateways that areĮxposed directly to the internet, gateways that serve many intermediate proxies, and other deployment topologies not To forward these clientĪttributes to destination workloads, proxies use the X-Forwarded-For (XFF) and X-Forwarded-Client-Cert (XFCC) headers. Provide client attributes to services has long been a staple of reverse proxies. Such as Web Application Firewalls (WAF), that need this information to apply rule sets properly. Notable cases include logging and audit tools that require the client IP be populated and security tools, Many applications require knowing the client IP address and certificate information of the originating request to behave Configuring X-Forwarded-Client-Cert Headersįorwarding external client attributes (IP address, certificate info) to destination workloads.Example using X-Forwarded-For capability with httpbin.Forwarding external client attributes (IP address, certificate info) to destination workloads.
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