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service-mesh: add egress implementation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| go 1.21 | ||
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| use ( | ||
| . | ||
| ./service-mesh | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,220 @@ | ||
| package main | ||
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| import ( | ||
| "fmt" | ||
| "net/netip" | ||
| "strings" | ||
|
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| envoyConfigBootstrapV3 "github.com/envoyproxy/go-control-plane/envoy/config/bootstrap/v3" | ||
| envoyConfigClusterV3 "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3" | ||
| envoyCoreV3 "github.com/envoyproxy/go-control-plane/envoy/config/core/v3" | ||
| endpointv3 "github.com/envoyproxy/go-control-plane/envoy/config/endpoint/v3" | ||
| envoyConfigListenerV3 "github.com/envoyproxy/go-control-plane/envoy/config/listener/v3" | ||
| envoyConfigTCPProxyV3 "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/network/tcp_proxy/v3" | ||
| envoyTLSV3 "github.com/envoyproxy/go-control-plane/envoy/extensions/transport_sockets/tls/v3" | ||
| "google.golang.org/protobuf/encoding/protojson" | ||
| "google.golang.org/protobuf/types/known/anypb" | ||
| ) | ||
|
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||
| var loopbackCIDR = netip.MustParsePrefix("127.0.0.1/8") | ||
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| type proxyConfig []configEntry | ||
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| type configEntry struct { | ||
| name string | ||
| listenAddr netip.Addr | ||
| port uint16 | ||
| remoteDomain string | ||
| } | ||
|
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| // ParseProxyConfig parses the proxy configuration from the given string. | ||
| // The configuration is expected to be in the following format: | ||
| // | ||
| // <name>#<listen-address>:<port>#<remote-domain>##<name>#<listen-address>:<port>#<remote-domain>... | ||
| // | ||
| // Example: | ||
| // | ||
| // emoji#127.137.0.1:8080#emoji-svc##voting#127.137.0.2:8080#voting-svc | ||
| func ParseProxyConfig(data string) (proxyConfig, error) { | ||
| entries := strings.Split(data, "##") | ||
| var cfg proxyConfig | ||
| for _, entry := range entries { | ||
| parts := strings.Split(entry, "#") | ||
| if len(parts) != 3 { | ||
| return nil, fmt.Errorf("invalid entry: %s", entry) | ||
| } | ||
| listenAddrPort, err := netip.ParseAddrPort(parts[1]) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("invalid listen address: %s", parts[1]) | ||
| } | ||
|
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||
| if !loopbackCIDR.Contains(listenAddrPort.Addr()) { | ||
| return nil, fmt.Errorf("listen address %s is not in local CIDR %s", listenAddrPort.Addr(), loopbackCIDR) | ||
| } | ||
| remoteDomain := parts[2] | ||
| cfg = append(cfg, configEntry{ | ||
| name: parts[0], | ||
| listenAddr: listenAddrPort.Addr(), | ||
| port: listenAddrPort.Port(), | ||
| remoteDomain: remoteDomain, | ||
| }) | ||
| } | ||
| return cfg, nil | ||
| } | ||
|
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| // ToEnvoyConfig converts the proxy configuration to an Envoy configuration. | ||
| // Reference: https://github.com/solo-io/envoy-operator/blob/master/pkg/kube/config.go | ||
| func (c proxyConfig) ToEnvoyConfig() ([]byte, error) { | ||
| config := &envoyConfigBootstrapV3.Bootstrap{ | ||
| StaticResources: &envoyConfigBootstrapV3.Bootstrap_StaticResources{}, | ||
| } | ||
| listeners := make([]*envoyConfigListenerV3.Listener, 0, len(c)) | ||
| clusters := make([]*envoyConfigClusterV3.Cluster, 0, len(c)) | ||
| for _, entry := range c { | ||
| listener, err := listener(entry) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| listeners = append(listeners, listener) | ||
| cluster, err := cluster(entry) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| clusters = append(clusters, cluster) | ||
| } | ||
| config.StaticResources.Listeners = listeners | ||
| config.StaticResources.Clusters = clusters | ||
|
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||
| if err := config.ValidateAll(); err != nil { | ||
| return nil, err | ||
| } | ||
|
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| configBytes, err := protojson.Marshal(config) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| return configBytes, nil | ||
| } | ||
|
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| func listener(entry configEntry) (*envoyConfigListenerV3.Listener, error) { | ||
| proxy := &envoyConfigTCPProxyV3.TcpProxy{ | ||
| StatPrefix: entry.name, | ||
| ClusterSpecifier: &envoyConfigTCPProxyV3.TcpProxy_Cluster{ | ||
| Cluster: entry.name, | ||
| }, | ||
| } | ||
|
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| proxyAny, err := anypb.New(proxy) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| return &envoyConfigListenerV3.Listener{ | ||
| Name: entry.name, | ||
| Address: &envoyCoreV3.Address{ | ||
| Address: &envoyCoreV3.Address_SocketAddress{ | ||
| SocketAddress: &envoyCoreV3.SocketAddress{ | ||
| Address: entry.listenAddr.String(), | ||
| PortSpecifier: &envoyCoreV3.SocketAddress_PortValue{ | ||
| PortValue: uint32(entry.port), | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| FilterChains: []*envoyConfigListenerV3.FilterChain{ | ||
| { | ||
| Filters: []*envoyConfigListenerV3.Filter{ | ||
| { | ||
| Name: "envoy.filters.network.tcp_proxy", | ||
| ConfigType: &envoyConfigListenerV3.Filter_TypedConfig{ | ||
| TypedConfig: proxyAny, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| }, nil | ||
| } | ||
|
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| func cluster(entry configEntry) (*envoyConfigClusterV3.Cluster, error) { | ||
| socket, err := tlsTransportSocket() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| return &envoyConfigClusterV3.Cluster{ | ||
| Name: entry.name, | ||
| ClusterDiscoveryType: &envoyConfigClusterV3.Cluster_Type{ | ||
| Type: envoyConfigClusterV3.Cluster_LOGICAL_DNS, | ||
| }, | ||
| DnsLookupFamily: envoyConfigClusterV3.Cluster_V4_ONLY, | ||
| LoadAssignment: &endpointv3.ClusterLoadAssignment{ | ||
| ClusterName: entry.name, | ||
| Endpoints: []*endpointv3.LocalityLbEndpoints{ | ||
| { | ||
| LbEndpoints: []*endpointv3.LbEndpoint{ | ||
| { | ||
| HostIdentifier: &endpointv3.LbEndpoint_Endpoint{ | ||
| Endpoint: &endpointv3.Endpoint{ | ||
| Address: &envoyCoreV3.Address{ | ||
| Address: &envoyCoreV3.Address_SocketAddress{ | ||
| SocketAddress: &envoyCoreV3.SocketAddress{ | ||
| Address: entry.remoteDomain, | ||
| PortSpecifier: &envoyCoreV3.SocketAddress_PortValue{ | ||
| PortValue: uint32(entry.port), | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| TransportSocket: socket, | ||
| }, nil | ||
| } | ||
|
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| func tlsTransportSocket() (*envoyCoreV3.TransportSocket, error) { | ||
| tls := &envoyTLSV3.UpstreamTlsContext{ | ||
| CommonTlsContext: &envoyTLSV3.CommonTlsContext{ | ||
| TlsCertificates: []*envoyTLSV3.TlsCertificate{ | ||
| { | ||
| PrivateKey: &envoyCoreV3.DataSource{ | ||
| Specifier: &envoyCoreV3.DataSource_Filename{ | ||
| Filename: "/tls-config/key.pem", | ||
| }, | ||
| }, | ||
| CertificateChain: &envoyCoreV3.DataSource{ | ||
| Specifier: &envoyCoreV3.DataSource_Filename{ | ||
| Filename: "/tls-config/certChain.pem", | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| ValidationContextType: &envoyTLSV3.CommonTlsContext_ValidationContext{ | ||
| ValidationContext: &envoyTLSV3.CertificateValidationContext{ | ||
| TrustedCa: &envoyCoreV3.DataSource{ | ||
| Specifier: &envoyCoreV3.DataSource_Filename{ | ||
| Filename: "/tls-config/MeshCACert.pem", | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| } | ||
| tlsAny, err := anypb.New(tls) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| return &envoyCoreV3.TransportSocket{ | ||
| Name: "envoy.transport_sockets.tls", | ||
| ConfigType: &envoyCoreV3.TransportSocket_TypedConfig{ | ||
| TypedConfig: tlsAny, | ||
| }, | ||
| }, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| module github.com/edgelesssys/nunki/service-mesh | ||
|
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| go 1.21 | ||
|
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| require ( | ||
| github.com/envoyproxy/go-control-plane v0.12.0 | ||
| google.golang.org/protobuf v1.32.0 | ||
| ) | ||
|
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| require ( | ||
| github.com/census-instrumentation/opencensus-proto v0.4.1 // indirect | ||
| github.com/cncf/xds/go v0.0.0-20230607035331-e9ce68804cb4 // indirect | ||
| github.com/envoyproxy/protoc-gen-validate v1.0.2 // indirect | ||
| github.com/golang/protobuf v1.5.3 // indirect | ||
| google.golang.org/genproto/googleapis/api v0.0.0-20230711160842-782d3b101e98 // indirect | ||
| google.golang.org/genproto/googleapis/rpc v0.0.0-20230711160842-782d3b101e98 // indirect | ||
| ) |
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