Support Generic OAuth 2.0 Device Authorization Grant (#433)

Support Generic OAuth 2.0 Device Authorization Grant
as per RFC specification https://www.rfc-editor.org/rfc/rfc8628.
The previous version supported only Auth0 as an IDP backend.
This implementation enables the Interactive SSO Login feature 
for any IDP compatible with the specification, e.g., Keycloak.

management/cmd/management.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"crypto/tls"
+	"encoding/json"
 	"errors"
 	"flag"
 	"fmt"
@@ -13,6 +14,7 @@ import (
 	"io/fs"
 	"net"
 	"net/http"
+	"net/url"
 	"os"
 	"path"
 	"strings"
@@ -304,9 +306,94 @@ func loadMgmtConfig(mgmtConfigPath string) (*server.Config, error) {
 		config.HttpConfig.CertKey = certKey
 	}
 
+	oidcEndpoint := config.HttpConfig.OIDCConfigEndpoint
+	if oidcEndpoint != "" {
+		// if OIDCConfigEndpoint is specified, we can load DeviceAuthEndpoint and TokenEndpoint automatically
+		log.Infof("loading OIDC configuration from the provided IDP configuration endpoint %s", oidcEndpoint)
+		oidcConfig, err := fetchOIDCConfig(oidcEndpoint)
+		if err != nil {
+			return nil, err
+		}
+		log.Infof("loaded OIDC configuration from the provided IDP configuration endpoint: %s", oidcEndpoint)
+
+		log.Infof("overriding HttpConfig.AuthIssuer with a new value %s, previously configured value: %s",
+			oidcConfig.Issuer, config.HttpConfig.AuthIssuer)
+		config.HttpConfig.AuthIssuer = oidcConfig.Issuer
+
+		log.Infof("overriding HttpConfig.AuthKeysLocation (JWT certs) with a new value %s, previously configured value: %s",
+			oidcConfig.JwksURI, config.HttpConfig.AuthKeysLocation)
+		config.HttpConfig.AuthKeysLocation = oidcConfig.JwksURI
+
+		if config.DeviceAuthorizationFlow != nil {
+			log.Infof("overriding DeviceAuthorizationFlow.TokenEndpoint with a new value: %s, previously configured value: %s",
+				oidcConfig.TokenEndpoint, config.DeviceAuthorizationFlow.ProviderConfig.TokenEndpoint)
+			config.DeviceAuthorizationFlow.ProviderConfig.TokenEndpoint = oidcConfig.TokenEndpoint
+			log.Infof("overriding DeviceAuthorizationFlow.DeviceAuthEndpoint with a new value: %s, previously configured value: %s",
+				oidcConfig.DeviceAuthEndpoint, config.DeviceAuthorizationFlow.ProviderConfig.DeviceAuthEndpoint)
+			config.DeviceAuthorizationFlow.ProviderConfig.DeviceAuthEndpoint = oidcConfig.DeviceAuthEndpoint
+
+			u, err := url.Parse(oidcEndpoint)
+			if err != nil {
+				return nil, err
+			}
+			log.Infof("overriding DeviceAuthorizationFlow.ProviderConfig.Domain with a new value: %s, previously configured value: %s",
+				u.Host, config.DeviceAuthorizationFlow.ProviderConfig.Domain)
+			config.DeviceAuthorizationFlow.ProviderConfig.Domain = u.Host
+
+		}
+		if config.IdpManagerConfig != nil {
+			log.Infof("overriding Auth0ClientCredentials.AuthIssuer with a new value: %s, previously configured value: %s",
+				oidcConfig.Issuer, config.IdpManagerConfig.Auth0ClientCredentials.AuthIssuer)
+			config.IdpManagerConfig.Auth0ClientCredentials.AuthIssuer = oidcConfig.Issuer
+		}
+	}
+
 	return config, err
 }
 
+// OIDCConfigResponse used for parsing OIDC config response
+type OIDCConfigResponse struct {
+	Issuer             string `json:"issuer"`
+	TokenEndpoint      string `json:"token_endpoint"`
+	DeviceAuthEndpoint string `json:"device_authorization_endpoint"`
+	JwksURI            string `json:"jwks_uri"`
+}
+
+// fetchOIDCConfig fetches OIDC configuration from the IDP
+func fetchOIDCConfig(oidcEndpoint string) (OIDCConfigResponse, error) {
+
+	res, err := http.Get(oidcEndpoint)
+	if err != nil {
+		return OIDCConfigResponse{}, fmt.Errorf("failed fetching OIDC configuration fro mendpoint %s %v", oidcEndpoint, err)
+	}
+
+	defer func() {
+		err := res.Body.Close()
+		if err != nil {
+			log.Debugf("failed closing response body %v", err)
+		}
+	}()
+
+	body, err := io.ReadAll(res.Body)
+	if err != nil {
+		return OIDCConfigResponse{}, fmt.Errorf("failed reading OIDC configuration response body: %v", err)
+	}
+
+	if res.StatusCode != 200 {
+		return OIDCConfigResponse{}, fmt.Errorf("OIDC configuration request returned status %d with response: %s",
+			res.StatusCode, string(body))
+	}
+
+	config := OIDCConfigResponse{}
+	err = json.Unmarshal(body, &config)
+	if err != nil {
+		return OIDCConfigResponse{}, fmt.Errorf("failed unmarshaling OIDC configuration response: %v", err)
+	}
+
+	return config, nil
+
+}
+
 func loadTLSConfig(certFile string, certKey string) (*tls.Config, error) {
 	// Load server's certificate and private key
 	serverCert, err := tls.LoadX509KeyPair(certFile, certKey)

management/proto/management.pb.go

@@ -1,15 +1,15 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.21.2
+// 	protoc        v3.12.4
 // source: management.proto
 
 package proto
 
 import (
+	timestamp "github.com/golang/protobuf/ptypes/timestamp"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
 	reflect "reflect"
 	sync "sync"
 )
@@ -611,7 +611,7 @@ type ServerKeyResponse struct {
 	// Server's Wireguard public key
 	Key string `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
 	// Key expiration timestamp after which the key should be fetched again by the client
-	ExpiresAt *timestamppb.Timestamp `protobuf:"bytes,2,opt,name=expiresAt,proto3" json:"expiresAt,omitempty"`
+	ExpiresAt *timestamp.Timestamp `protobuf:"bytes,2,opt,name=expiresAt,proto3" json:"expiresAt,omitempty"`
 	// Version of the Wiretrustee Management Service protocol
 	Version int32 `protobuf:"varint,3,opt,name=version,proto3" json:"version,omitempty"`
 }
@@ -655,7 +655,7 @@ func (x *ServerKeyResponse) GetKey() string {
 	return ""
 }
 
-func (x *ServerKeyResponse) GetExpiresAt() *timestamppb.Timestamp {
+func (x *ServerKeyResponse) GetExpiresAt() *timestamp.Timestamp {
 	if x != nil {
 		return x.ExpiresAt
 	}
@@ -1287,9 +1287,14 @@ type ProviderConfig struct {
 	// An IDP application client secret
 	ClientSecret string `protobuf:"bytes,2,opt,name=ClientSecret,proto3" json:"ClientSecret,omitempty"`
 	// An IDP API domain
+	// Deprecated. Use a DeviceAuthEndpoint and TokenEndpoint
 	Domain string `protobuf:"bytes,3,opt,name=Domain,proto3" json:"Domain,omitempty"`
 	// An Audience for validation
 	Audience string `protobuf:"bytes,4,opt,name=Audience,proto3" json:"Audience,omitempty"`
+	// DeviceAuthEndpoint is an endpoint to request device authentication code.
+	DeviceAuthEndpoint string `protobuf:"bytes,5,opt,name=DeviceAuthEndpoint,proto3" json:"DeviceAuthEndpoint,omitempty"`
+	// TokenEndpoint is an endpoint to request auth token.
+	TokenEndpoint string `protobuf:"bytes,6,opt,name=TokenEndpoint,proto3" json:"TokenEndpoint,omitempty"`
 }
 
 func (x *ProviderConfig) Reset() {
@@ -1352,6 +1357,20 @@ func (x *ProviderConfig) GetAudience() string {
 	return ""
 }
 
+func (x *ProviderConfig) GetDeviceAuthEndpoint() string {
+	if x != nil {
+		return x.DeviceAuthEndpoint
+	}
+	return ""
+}
+
+func (x *ProviderConfig) GetTokenEndpoint() string {
+	if x != nil {
+		return x.TokenEndpoint
+	}
+	return ""
+}
+
 // Route represents a route.Route object
 type Route struct {
 	state         protoimpl.MessageState
@@ -1607,7 +1626,7 @@ var file_management_proto_rawDesc = []byte{
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@@ -1615,43 +1634,49 @@ var file_management_proto_rawDesc = []byte{
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+	0x74, 0x6f, 0x33,
 }
 
 var (
@@ -1691,7 +1716,7 @@ var file_management_proto_goTypes = []interface{}{
 	(*DeviceAuthorizationFlow)(nil),        // 19: management.DeviceAuthorizationFlow
 	(*ProviderConfig)(nil),                 // 20: management.ProviderConfig
 	(*Route)(nil),                          // 21: management.Route
-	(*timestamppb.Timestamp)(nil),          // 22: google.protobuf.Timestamp
+	(*timestamp.Timestamp)(nil),            // 22: google.protobuf.Timestamp
 }
 var file_management_proto_depIdxs = []int32{
 	11, // 0: management.SyncResponse.wiretrusteeConfig:type_name -> management.WiretrusteeConfig

management/proto/management.proto

@@ -227,9 +227,14 @@ message ProviderConfig {
   // An IDP application client secret
   string ClientSecret = 2;
   // An IDP API domain
-  string Domain =3;
+  // Deprecated. Use a DeviceAuthEndpoint and TokenEndpoint
+  string Domain = 3;
   // An Audience for validation
   string Audience = 4;
+  // DeviceAuthEndpoint is an endpoint to request device authentication code.
+  string DeviceAuthEndpoint = 5;
+  // TokenEndpoint is an endpoint to request auth token.
+  string TokenEndpoint = 6;
 }
 
 // Route represents a route.Route object

management/server/config.go

@@ -55,6 +55,8 @@ type HttpServerConfig struct {
 	AuthIssuer string
 	// AuthKeysLocation is a location of JWT key set containing the public keys used to verify JWT
 	AuthKeysLocation string
+	// OIDCConfigEndpoint is the endpoint of an IDP manager to get OIDC configuration
+	OIDCConfigEndpoint string
 }
 
 // Host represents a Wiretrustee host (e.g. STUN, TURN, Signal)
@@ -81,9 +83,14 @@ type ProviderConfig struct {
 	// ClientSecret An IDP application client secret
 	ClientSecret string
 	// Domain An IDP API domain
+	// Deprecated. Use TokenEndpoint and DeviceAuthEndpoint
 	Domain string
 	// Audience An Audience for to authorization validation
 	Audience string
+	// TokenEndpoint is the endpoint of an IDP manager where clients can obtain access token
+	TokenEndpoint string
+	// DeviceAuthEndpoint is the endpoint of an IDP manager where clients can obtain device authorization code
+	DeviceAuthEndpoint string
 }
 
 // validateURL validates input http url

management/server/grpcserver.go

@@ -503,10 +503,12 @@ func (s *GRPCServer) GetDeviceAuthorizationFlow(ctx context.Context, req *proto.
 	flowInfoResp := &proto.DeviceAuthorizationFlow{
 		Provider: proto.DeviceAuthorizationFlowProvider(provider),
 		ProviderConfig: &proto.ProviderConfig{
-			ClientID:     s.config.DeviceAuthorizationFlow.ProviderConfig.ClientID,
-			ClientSecret: s.config.DeviceAuthorizationFlow.ProviderConfig.ClientSecret,
-			Domain:       s.config.DeviceAuthorizationFlow.ProviderConfig.Domain,
-			Audience:     s.config.DeviceAuthorizationFlow.ProviderConfig.Audience,
+			ClientID:           s.config.DeviceAuthorizationFlow.ProviderConfig.ClientID,
+			ClientSecret:       s.config.DeviceAuthorizationFlow.ProviderConfig.ClientSecret,
+			Domain:             s.config.DeviceAuthorizationFlow.ProviderConfig.Domain,
+			Audience:           s.config.DeviceAuthorizationFlow.ProviderConfig.Audience,
+			DeviceAuthEndpoint: s.config.DeviceAuthorizationFlow.ProviderConfig.DeviceAuthEndpoint,
+			TokenEndpoint:      s.config.DeviceAuthorizationFlow.ProviderConfig.TokenEndpoint,
 		},
 	}