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// Copyright 2018 Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
syntax = "proto3";
import "google/api/field_behavior.proto";
import "networking/v1alpha3/gateway.proto";
import "networking/v1alpha3/virtual_service.proto";
import "networking/v1alpha3/destination_rule.proto";
// $schema: istio.networking.v1alpha3.Sidecar
// $title: Sidecar
// $description: Configuration affecting network reachability of a sidecar.
// $location: https://istio.io/docs/reference/config/networking/sidecar.html
// $aliases: [/docs/reference/config/networking/v1alpha3/sidecar]
// `Sidecar` describes the configuration of the sidecar proxy that mediates
// inbound and outbound communication to the workload instance it is attached to. By
// default, Istio will program all sidecar proxies in the mesh with the
// necessary configuration required to reach every workload instance in the mesh, as
// well as accept traffic on all the ports associated with the
// workload. The `Sidecar` configuration provides a way to fine tune the set of
// ports, protocols that the proxy will accept when forwarding traffic to
// and from the workload. In addition, it is possible to restrict the set
// of services that the proxy can reach when forwarding outbound traffic
// from workload instances.
//
// Services and configuration in a mesh are organized into one or more
// namespaces (e.g., a Kubernetes namespace or a CF org/space). A `Sidecar`
// configuration in a namespace will apply to one or more workload instances in the same
// namespace, selected using the `workloadSelector` field. In the absence of a
// `workloadSelector`, it will apply to all workload instances in the same
// namespace. When determining the `Sidecar` configuration to be applied to a
// workload instance, preference will be given to the resource with a
// `workloadSelector` that selects this workload instance, over a `Sidecar` configuration
// without any `workloadSelector`.
//
// **NOTE 1**: *_Each namespace can have only one `Sidecar`
// configuration without any `workloadSelector`_ that specifies the
// default for all pods in that namespace*. It is recommended to use
// the name `default` for the namespace-wide sidecar. The behavior of
// the system is undefined if more than one selector-less `Sidecar`
// configurations exist in a given namespace. The behavior of the
// system is undefined if two or more `Sidecar` configurations with a
// `workloadSelector` select the same workload instance.
//
// **NOTE 2**: *_A `Sidecar` configuration in the `MeshConfig`
// [root namespace](https://istio.io/docs/reference/config/istio.mesh.v1alpha1/#MeshConfig)
// will be applied by default to all namespaces without a `Sidecar`
// configuration_*. This global default `Sidecar` configuration should not have
// any `workloadSelector`.
//
// The example below declares a global default `Sidecar` configuration
// in the root namespace called `istio-config`, that configures
// sidecars in all namespaces to allow egress traffic only to other
// workloads in the same namespace as well as to services in the
// `istio-system` namespace.
//
// {{}}
// {{}}
// ```yaml
// apiVersion: networking.istio.io/v1alpha3
// kind: Sidecar
// metadata:
// name: default
// namespace: istio-config
// spec:
// egress:
// - hosts:
// - "./*"
// - "istio-system/*"
// ```
// {{}}
//
// {{}}
// ```yaml
// apiVersion: networking.istio.io/v1beta1
// kind: Sidecar
// metadata:
// name: default
// namespace: istio-config
// spec:
// egress:
// - hosts:
// - "./*"
// - "istio-system/*"
// ```
// {{}}
// {{}}
//
// The example below declares a `Sidecar` configuration in the
// `prod-us1` namespace that overrides the global default defined
// above, and configures the sidecars in the namespace to allow egress
// traffic to public services in the `prod-us1`, `prod-apis`, and the
// `istio-system` namespaces.
//
// {{}}
// {{}}
// ```yaml
// apiVersion: networking.istio.io/v1alpha3
// kind: Sidecar
// metadata:
// name: default
// namespace: prod-us1
// spec:
// egress:
// - hosts:
// - "prod-us1/*"
// - "prod-apis/*"
// - "istio-system/*"
// ```
// {{}}
//
// {{}}
// ```yaml
// apiVersion: networking.istio.io/v1beta1
// kind: Sidecar
// metadata:
// name: default
// namespace: prod-us1
// spec:
// egress:
// - hosts:
// - "prod-us1/*"
// - "prod-apis/*"
// - "istio-system/*"
// ```
// {{}}
// {{}}
//
// The following example declares a `Sidecar` configuration in the
// `prod-us1` namespace for all pods with labels `app: ratings`
// belonging to the `ratings.prod-us1` service. The workload accepts
// inbound HTTP traffic on port 9080. The traffic is then forwarded to
// the attached workload instance listening on a Unix domain
// socket. In the egress direction, in addition to the `istio-system`
// namespace, the sidecar proxies only HTTP traffic bound for port
// 9080 for services in the `prod-us1` namespace.
//
// {{}}
// {{}}
// ```yaml
// apiVersion: networking.istio.io/v1alpha3
// kind: Sidecar
// metadata:
// name: ratings
// namespace: prod-us1
// spec:
// workloadSelector:
// labels:
// app: ratings
// ingress:
// - port:
// number: 9080
// protocol: HTTP
// name: somename
// defaultEndpoint: unix:///var/run/someuds.sock
// egress:
// - port:
// number: 9080
// protocol: HTTP
// name: egresshttp
// hosts:
// - "prod-us1/*"
// - hosts:
// - "istio-system/*"
// ```
// {{}}
//
// {{}}
// ```yaml
// apiVersion: networking.istio.io/v1beta1
// kind: Sidecar
// metadata:
// name: ratings
// namespace: prod-us1
// spec:
// workloadSelector:
// labels:
// app: ratings
// ingress:
// - port:
// number: 9080
// protocol: HTTP
// name: somename
// defaultEndpoint: unix:///var/run/someuds.sock
// egress:
// - port:
// number: 9080
// protocol: HTTP
// name: egresshttp
// hosts:
// - "prod-us1/*"
// - hosts:
// - "istio-system/*"
// ```
// {{}}
// {{}}
//
// If the workload is deployed without IPTables-based traffic capture,
// the `Sidecar` configuration is the only way to configure the ports
// on the proxy attached to the workload instance. The following
// example declares a `Sidecar` configuration in the `prod-us1`
// namespace for all pods with labels `app: productpage` belonging to
// the `productpage.prod-us1` service. Assuming that these pods are
// deployed without IPtable rules (i.e. the `istio-init` container)
// and the proxy metadata `ISTIO_META_INTERCEPTION_MODE` is set to
// `NONE`, the specification, below, allows such pods to receive HTTP
// traffic on port 9080 (wrapped inside Istio mutual TLS) and forward
// it to the application listening on `127.0.0.1:8080`. It also allows
// the application to communicate with a backing MySQL database on
// `127.0.0.1:3306`, that then gets proxied to the externally hosted
// MySQL service at `mysql.foo.com:3306`.
//
// {{}}
// {{}}
// ```yaml
// apiVersion: networking.istio.io/v1alpha3
// kind: Sidecar
// metadata:
// name: no-ip-tables
// namespace: prod-us1
// spec:
// workloadSelector:
// labels:
// app: productpage
// ingress:
// - port:
// number: 9080 # binds to proxy_instance_ip:9080 (0.0.0.0:9080, if no unicast IP is available for the instance)
// protocol: HTTP
// name: somename
// defaultEndpoint: 127.0.0.1:8080
// captureMode: NONE # not needed if metadata is set for entire proxy
// egress:
// - port:
// number: 3306
// protocol: MYSQL
// name: egressmysql
// captureMode: NONE # not needed if metadata is set for entire proxy
// bind: 127.0.0.1
// hosts:
// - "*/mysql.foo.com"
// ```
// {{}}
//
// {{}}
// ```yaml
// apiVersion: networking.istio.io/v1beta1
// kind: Sidecar
// metadata:
// name: no-ip-tables
// namespace: prod-us1
// spec:
// workloadSelector:
// labels:
// app: productpage
// ingress:
// - port:
// number: 9080 # binds to proxy_instance_ip:9080 (0.0.0.0:9080, if no unicast IP is available for the instance)
// protocol: HTTP
// name: somename
// defaultEndpoint: 127.0.0.1:8080
// captureMode: NONE # not needed if metadata is set for entire proxy
// egress:
// - port:
// number: 3306
// protocol: MYSQL
// name: egressmysql
// captureMode: NONE # not needed if metadata is set for entire proxy
// bind: 127.0.0.1
// hosts:
// - "*/mysql.foo.com"
// ```
// {{}}
// {{}}
//
// And the associated service entry for routing to `mysql.foo.com:3306`
//
// {{}}
// {{}}
// ```yaml
// apiVersion: networking.istio.io/v1alpha3
// kind: ServiceEntry
// metadata:
// name: external-svc-mysql
// namespace: ns1
// spec:
// hosts:
// - mysql.foo.com
// ports:
// - number: 3306
// name: mysql
// protocol: MYSQL
// location: MESH_EXTERNAL
// resolution: DNS
// ```
// {{}}
//
// {{}}
// ```yaml
// apiVersion: networking.istio.io/v1beta1
// kind: ServiceEntry
// metadata:
// name: external-svc-mysql
// namespace: ns1
// spec:
// hosts:
// - mysql.foo.com
// ports:
// - number: 3306
// name: mysql
// protocol: MYSQL
// location: MESH_EXTERNAL
// resolution: DNS
// ```
// {{}}
// {{}}
//
// It is also possible to mix and match traffic capture modes in a single
// proxy. For example, consider a setup where internal services are on the
// `192.168.0.0/16` subnet. So, IP tables are setup on the VM to capture all
// outbound traffic on `192.168.0.0/16` subnet. Assume that the VM has an
// additional network interface on `172.16.0.0/16` subnet for inbound
// traffic. The following `Sidecar` configuration allows the VM to expose a
// listener on `172.16.1.32:80` (the VM's IP) for traffic arriving from the
// `172.16.0.0/16` subnet.
//
// **NOTE**: The `ISTIO_META_INTERCEPTION_MODE` metadata on the
// proxy in the VM should contain `REDIRECT` or `TPROXY` as its value,
// implying that IP tables based traffic capture is active.
//
// {{}}
// {{}}
// ```yaml
// apiVersion: networking.istio.io/v1alpha3
// kind: Sidecar
// metadata:
// name: partial-ip-tables
// namespace: prod-us1
// spec:
// workloadSelector:
// labels:
// app: productpage
// ingress:
// - bind: 172.16.1.32
// port:
// number: 80 # binds to 172.16.1.32:80
// protocol: HTTP
// name: somename
// defaultEndpoint: 127.0.0.1:8080
// captureMode: NONE
// egress:
// # use the system detected defaults
// # sets up configuration to handle outbound traffic to services
// # in 192.168.0.0/16 subnet, based on information provided by the
// # service registry
// - captureMode: IPTABLES
// hosts:
// - "*/*"
// ```
// {{}}
//
// {{}}
// ```yaml
// apiVersion: networking.istio.io/v1beta1
// kind: Sidecar
// metadata:
// name: partial-ip-tables
// namespace: prod-us1
// spec:
// workloadSelector:
// labels:
// app: productpage
// ingress:
// - bind: 172.16.1.32
// port:
// number: 80 # binds to 172.16.1.32:80
// protocol: HTTP
// name: somename
// defaultEndpoint: 127.0.0.1:8080
// captureMode: NONE
// egress:
// # use the system detected defaults
// # sets up configuration to handle outbound traffic to services
// # in 192.168.0.0/16 subnet, based on information provided by the
// # service registry
// - captureMode: IPTABLES
// hosts:
// - "*/*"
// ```
// {{}}
// {{}}
//
package istio.networking.v1alpha3;
option go_package = "istio.io/api/networking/v1alpha3";
// `Sidecar` describes the configuration of the sidecar proxy that mediates
// inbound and outbound communication of the workload instance to which it is
// attached.
//
//
//
//
message Sidecar {
// Criteria used to select the specific set of pods/VMs on which this
// `Sidecar` configuration should be applied. If omitted, the `Sidecar`
// configuration will be applied to all workload instances in the same namespace.
WorkloadSelector workload_selector = 1;
// Ingress specifies the configuration of the sidecar for processing
// inbound traffic to the attached workload instance. If omitted, Istio will
// automatically configure the sidecar based on the information about the workload
// obtained from the orchestration platform (e.g., exposed ports, services,
// etc.). If specified, inbound ports are configured if and only if the
// workload instance is associated with a service.
repeated IstioIngressListener ingress = 2;
// Egress specifies the configuration of the sidecar for processing
// outbound traffic from the attached workload instance to other
// services in the mesh. If not specified, inherits the system
// detected defaults from the namespace-wide or the global default Sidecar.
repeated IstioEgressListener egress = 3;
// Configuration for the outbound traffic policy. If your
// application uses one or more external services that are not known
// apriori, setting the policy to `ALLOW_ANY` will cause the
// sidecars to route any unknown traffic originating from the
// application to its requested destination. If not specified,
// inherits the system detected defaults from the namespace-wide or
// the global default Sidecar.
OutboundTrafficPolicy outbound_traffic_policy = 4;
reserved "localhost";
reserved 5, 6;
}
// `IstioIngressListener` specifies the properties of an inbound
// traffic listener on the sidecar proxy attached to a workload instance.
message IstioIngressListener {
// The port associated with the listener.
Port port = 1 [(google.api.field_behavior) = REQUIRED];
// The IP to which the listener should be bound. Must be in the
// format `x.x.x.x`. Unix domain socket addresses are not allowed in
// the bind field for ingress listeners. If omitted, Istio will
// automatically configure the defaults based on imported services
// and the workload instances to which this configuration is applied
// to.
string bind = 2;
// The captureMode option dictates how traffic to the listener is
// expected to be captured (or not).
CaptureMode capture_mode = 3;
// The IP endpoint or Unix domain socket to which
// traffic should be forwarded to. This configuration can be used to
// redirect traffic arriving at the bind `IP:Port` on the sidecar to a `localhost:port`
// or Unix domain socket where the application workload instance is listening for
// connections. Arbitrary IPs are not supported. Format should be one of `127.0.0.1:PORT`, `0.0.0.0:PORT`
// (which will forward to the instance IP), or `unix:///path/to/socket`
string default_endpoint = 4 [(google.api.field_behavior) = REQUIRED];
reserved "localhost_client_tls";
reserved 5, 6;
}
// `IstioEgressListener` specifies the properties of an outbound traffic
// listener on the sidecar proxy attached to a workload instance.
message IstioEgressListener {
// The port associated with the listener. If using Unix domain socket,
// use 0 as the port number, with a valid protocol. The port if
// specified, will be used as the default destination port associated
// with the imported hosts. If the port is omitted, Istio will infer the
// listener ports based on the imported hosts. Note that when multiple
// egress listeners are specified, where one or more listeners have
// specific ports while others have no port, the hosts exposed on a
// listener port will be based on the listener with the most specific
// port.
Port port = 1;
// The IP or the Unix domain socket to which the listener should be bound
// to. Port MUST be specified if bind is not empty. Format: `x.x.x.x` or
// `unix:///path/to/uds` or `unix://@foobar` (Linux abstract namespace). If
// omitted, Istio will automatically configure the defaults based on imported
// services, the workload instances to which this configuration is applied to and
// the captureMode. If captureMode is `NONE`, bind will default to
// 127.0.0.1.
string bind = 2;
// When the bind address is an IP, the captureMode option dictates
// how traffic to the listener is expected to be captured (or not).
// captureMode must be DEFAULT or `NONE` for Unix domain socket binds.
CaptureMode capture_mode = 3;
// One or more service hosts exposed by the listener
// in `namespace/dnsName` format. Services in the specified namespace
// matching `dnsName` will be exposed.
// The corresponding service can be a service in the service registry
// (e.g., a Kubernetes or cloud foundry service) or a service specified
// using a `ServiceEntry` or `VirtualService` configuration. Any
// associated `DestinationRule` in the same namespace will also be used.
//
// The `dnsName` should be specified using FQDN format, optionally including
// a wildcard character in the left-most component (e.g., `prod/*.example.com`).
// Set the `dnsName` to `*` to select all services from the specified namespace
// (e.g., `prod/*`).
//
// The `namespace` can be set to `*`, `.`, or `~`, representing any, the current,
// or no namespace, respectively. For example, `*/foo.example.com` selects the
// service from any available namespace while `./foo.example.com` only selects
// the service from the namespace of the sidecar. If a host is set to `*/*`,
// Istio will configure the sidecar to be able to reach every service in the
// mesh that is exported to the sidecar's namespace. The value `~/*` can be used
// to completely trim the configuration for sidecars that simply receive traffic
// and respond, but make no outbound connections of their own.
//
// NOTE: Only services and configuration artifacts exported to the sidecar's
// namespace (e.g., `exportTo` value of `*`) can be referenced.
// Private configurations (e.g., `exportTo` set to `.`) will
// not be available. Refer to the `exportTo` setting in `VirtualService`,
// `DestinationRule`, and `ServiceEntry` configurations for details.
//
// **WARNING:** The list of egress hosts in a `Sidecar` must also include
// the Mixer control plane services if they are enabled. Envoy will not
// be able to reach them otherwise. For example, add host
// `istio-system/istio-telemetry.istio-system.svc.cluster.local` if telemetry
// is enabled, `istio-system/istio-policy.istio-system.svc.cluster.local` if
// policy is enabled, or add `istio-system/*` to allow all services in the
// `istio-system` namespace. This requirement is temporary and will be removed
// in a future Istio release.
repeated string hosts = 4 [(google.api.field_behavior) = REQUIRED];
reserved "localhost_server_tls";
reserved 5, 6;
}
// `WorkloadSelector` specifies the criteria used to determine if the
// `Gateway`, `Sidecar`, or `EnvoyFilter` or `ServiceEntry`
// configuration can be applied to a proxy. The matching criteria
// includes the metadata associated with a proxy, workload instance
// info such as labels attached to the pod/VM, or any other info that
// the proxy provides to Istio during the initial handshake. If
// multiple conditions are specified, all conditions need to match in
// order for the workload instance to be selected. Currently, only
// label based selection mechanism is supported.
message WorkloadSelector {
// One or more labels that indicate a specific set of pods/VMs
// on which the configuration should be applied. The scope of
// label search is restricted to the configuration namespace in which the
// the resource is present.
map labels = 1 [(google.api.field_behavior) = REQUIRED];
// $hide_from_docs
// other forms of identification supplied by the proxy
// when connecting to Pilot, such as X509 fields, tenant IDs, JWT,
// etc. This has nothing to do with the request level authN etc.
}
// `OutboundTrafficPolicy` sets the default behavior of the sidecar for
// handling outbound traffic from the application.
// If your application uses one or more external
// services that are not known apriori, setting the policy to `ALLOW_ANY`
// will cause the sidecars to route any unknown traffic originating from
// the application to its requested destination. Users are strongly
// encouraged to use `ServiceEntry` configurations to explicitly declare any external
// dependencies, instead of using `ALLOW_ANY`, so that traffic to these
// services can be monitored.
message OutboundTrafficPolicy {
enum Mode {
// Outbound traffic will be restricted to services defined in the
// service registry as well as those defined through `ServiceEntry` configurations.
REGISTRY_ONLY = 0;
// Outbound traffic to unknown destinations will be allowed, in case
// there are no services or `ServiceEntry` configurations for the destination port.
ALLOW_ANY = 1;
}
Mode mode = 1;
// Specifies the details of the egress proxy to which unknown
// traffic should be forwarded to from the sidecar. Valid only if
// the mode is set to ALLOW_ANY. If not specified when the mode is
// ALLOW_ANY, the sidecar will send the unknown traffic directly to
// the IP requested by the application.
//
// ** NOTE 1**: The specified egress host must be imported in the
// egress section for the traffic forwarding to work.
//
// ** NOTE 2**: An Envoy based egress gateway is unlikely to be able
// to handle plain text TCP connections forwarded from the sidecar.
// Envoy's dynamic forward proxy can handle only HTTP and TLS
// connections.
// $hide_from_docs
istio.networking.v1alpha3.Destination egress_proxy = 2;
}
// `CaptureMode` describes how traffic to a listener is expected to be
// captured. Applicable only when the listener is bound to an IP.
enum CaptureMode {
// The default capture mode defined by the environment.
DEFAULT = 0;
// Capture traffic using IPtables redirection.
IPTABLES = 1;
// No traffic capture. When used in an egress listener, the application is
// expected to explicitly communicate with the listener port or Unix
// domain socket. When used in an ingress listener, care needs to be taken
// to ensure that the listener port is not in use by other processes on
// the host.
NONE = 2;
}
