Update config shape

federationapi/federationapi.go

@@ -120,17 +120,7 @@ func NewInternalAPI(
 
 	js, nats := base.NATS.Prepare(base.ProcessContext, &cfg.Matrix.JetStream)
 
-	signingInfo := map[gomatrixserverlib.ServerName]*queue.SigningInfo{}
-	for _, serverName := range append(
-		[]gomatrixserverlib.ServerName{base.Cfg.Global.ServerName},
-		base.Cfg.Global.SecondaryServerNames...,
-	) {
-		signingInfo[serverName] = &queue.SigningInfo{
-			KeyID:      cfg.Matrix.KeyID,
-			PrivateKey: cfg.Matrix.PrivateKey,
-			ServerName: serverName,
-		}
-	}
+	signingInfo := base.Cfg.Global.SigningIdentities()
 
 	queues := queue.NewOutgoingQueues(
 		federationDB, base.ProcessContext,

federationapi/queue/destinationqueue.go

@@ -50,7 +50,7 @@ type destinationQueue struct {
 	queues             *OutgoingQueues
 	db                 storage.Database
 	process            *process.ProcessContext
-	signing            map[gomatrixserverlib.ServerName]*SigningInfo
+	signing            map[gomatrixserverlib.ServerName]*gomatrixserverlib.SigningIdentity
 	rsAPI              api.FederationRoomserverAPI
 	client             fedapi.FederationClient         // federation client
 	origin             gomatrixserverlib.ServerName    // origin of requests

federationapi/queue/queue.go

@@ -15,7 +15,6 @@
 package queue
 
 import (
-	"crypto/ed25519"
 	"encoding/json"
 	"fmt"
 	"sync"
@@ -46,7 +45,7 @@ type OutgoingQueues struct {
 	origin      gomatrixserverlib.ServerName
 	client      fedapi.FederationClient
 	statistics  *statistics.Statistics
-	signing     map[gomatrixserverlib.ServerName]*SigningInfo
+	signing     map[gomatrixserverlib.ServerName]*gomatrixserverlib.SigningIdentity
 	queuesMutex sync.Mutex // protects the below
 	queues      map[gomatrixserverlib.ServerName]*destinationQueue
 }
@@ -91,7 +90,7 @@ func NewOutgoingQueues(
 	client fedapi.FederationClient,
 	rsAPI api.FederationRoomserverAPI,
 	statistics *statistics.Statistics,
-	signing map[gomatrixserverlib.ServerName]*SigningInfo,
+	signing []*gomatrixserverlib.SigningIdentity,
 ) *OutgoingQueues {
 	queues := &OutgoingQueues{
 		disabled:   disabled,
@@ -101,9 +100,12 @@ func NewOutgoingQueues(
 		origin:     origin,
 		client:     client,
 		statistics: statistics,
-		signing:    signing,
+		signing:    map[gomatrixserverlib.ServerName]*gomatrixserverlib.SigningIdentity{},
 		queues:     map[gomatrixserverlib.ServerName]*destinationQueue{},
 	}
+	for _, identity := range signing {
+		queues.signing[identity.ServerName] = identity
+	}
 	// Look up which servers we have pending items for and then rehydrate those queues.
 	if !disabled {
 		serverNames := map[gomatrixserverlib.ServerName]struct{}{}
@@ -135,14 +137,6 @@ func NewOutgoingQueues(
 	return queues
 }
 
-// TODO: Move this somewhere useful for other components as we often need to ferry these 3 variables
-// around together
-type SigningInfo struct {
-	ServerName gomatrixserverlib.ServerName
-	KeyID      gomatrixserverlib.KeyID
-	PrivateKey ed25519.PrivateKey
-}
-
 type queuedPDU struct {
 	receipt *shared.Receipt
 	pdu     *gomatrixserverlib.HeaderedEvent

federationapi/queue/queue_test.go

@@ -350,8 +350,8 @@ func testSetup(failuresUntilBlacklist uint32, shouldTxSucceed bool, t *testing.T
 	}
 	rs := &stubFederationRoomServerAPI{}
 	stats := statistics.NewStatistics(db, failuresUntilBlacklist)
-	signingInfo := map[gomatrixserverlib.ServerName]*SigningInfo{
-		"localhost": {
+	signingInfo := []*gomatrixserverlib.SigningIdentity{
+		{
 			KeyID:      "ed21019:auto",
 			PrivateKey: test.PrivateKeyA,
 			ServerName: "localhost",

federationapi/routing/keys.go

@@ -136,30 +136,36 @@ func ClaimOneTimeKeys(
 // LocalKeys returns the local keys for the server.
 // See https://matrix.org/docs/spec/server_server/unstable.html#publishing-keys
 func LocalKeys(cfg *config.FederationAPI, serverName gomatrixserverlib.ServerName) util.JSONResponse {
-	keys, err := localKeys(cfg, serverName, time.Now().Add(cfg.Matrix.KeyValidityPeriod))
+	keys, err := localKeys(cfg, serverName)
 	if err != nil {
 		return util.ErrorResponse(err)
 	}
 	return util.JSONResponse{Code: http.StatusOK, JSON: keys}
 }
 
-func localKeys(cfg *config.FederationAPI, serverName gomatrixserverlib.ServerName, validUntil time.Time) (*gomatrixserverlib.ServerKeys, error) {
+func localKeys(cfg *config.FederationAPI, serverName gomatrixserverlib.ServerName) (*gomatrixserverlib.ServerKeys, error) {
 	var keys gomatrixserverlib.ServerKeys
 	if !cfg.Matrix.IsLocalServerName(serverName) {
 		return nil, fmt.Errorf("server name not known")
 	}
 
-	keys.ServerName = serverName
-	keys.ValidUntilTS = gomatrixserverlib.AsTimestamp(validUntil)
+	var virtualHost *config.VirtualHost
+	for _, v := range cfg.Matrix.VirtualHosts {
+		if v.ServerName != serverName {
+			continue
+		}
+		virtualHost = v
+	}
 
+	if virtualHost == nil {
 		publicKey := cfg.Matrix.PrivateKey.Public().(ed25519.PublicKey)
-
+		keys.ServerName = cfg.Matrix.ServerName
+		keys.ValidUntilTS = gomatrixserverlib.AsTimestamp(time.Now().Add(cfg.Matrix.KeyValidityPeriod))
 		keys.VerifyKeys = map[gomatrixserverlib.KeyID]gomatrixserverlib.VerifyKey{
 			cfg.Matrix.KeyID: {
 				Key: gomatrixserverlib.Base64Bytes(publicKey),
 			},
 		}
-
 		keys.OldVerifyKeys = map[gomatrixserverlib.KeyID]gomatrixserverlib.OldVerifyKey{}
 		for _, oldVerifyKey := range cfg.Matrix.OldVerifyKeys {
 			keys.OldVerifyKeys[oldVerifyKey.KeyID] = gomatrixserverlib.OldVerifyKey{
@@ -169,6 +175,18 @@ func localKeys(cfg *config.FederationAPI, serverName gomatrixserverlib.ServerNam
 				ExpiredTS: oldVerifyKey.ExpiredAt,
 			}
 		}
+	} else {
+		publicKey := virtualHost.PrivateKey.Public().(ed25519.PublicKey)
+		keys.ServerName = virtualHost.ServerName
+		keys.ValidUntilTS = gomatrixserverlib.AsTimestamp(time.Now().Add(virtualHost.KeyValidityPeriod))
+		keys.VerifyKeys = map[gomatrixserverlib.KeyID]gomatrixserverlib.VerifyKey{
+			virtualHost.KeyID: {
+				Key: gomatrixserverlib.Base64Bytes(publicKey),
+			},
+		}
+		// TODO: Virtual hosts probably want to be able to specify old signing
+		// keys too, just in case
+	}
 
 	toSign, err := json.Marshal(keys.ServerKeyFields)
 	if err != nil {
@@ -213,7 +231,7 @@ func NotaryKeys(
 	for serverName, kidToCriteria := range req.ServerKeys {
 		var keyList []gomatrixserverlib.ServerKeys
 		if serverName == cfg.Matrix.ServerName {
-			if k, err := localKeys(cfg, serverName, time.Now().Add(cfg.Matrix.KeyValidityPeriod)); err == nil {
+			if k, err := localKeys(cfg, serverName); err == nil {
 				keyList = append(keyList, *k)
 			} else {
 				return util.ErrorResponse(err)

setup/base/base.go

@@ -364,19 +364,7 @@ func (b *BaseDendrite) CreateClient() *gomatrixserverlib.Client {
 // CreateFederationClient creates a new federation client. Should only be called
 // once per component.
 func (b *BaseDendrite) CreateFederationClient() *gomatrixserverlib.FederationClient {
-	identities := make([]*gomatrixserverlib.SigningIdentity, 0, 1+len(b.Cfg.Global.SecondaryServerNames))
-	identities = append(identities, &gomatrixserverlib.SigningIdentity{
-		ServerName: b.Cfg.Global.ServerName,
-		KeyID:      b.Cfg.Global.KeyID,
-		PrivateKey: b.Cfg.Global.PrivateKey,
-	})
-	for _, serverName := range b.Cfg.Global.SecondaryServerNames {
-		identities = append(identities, &gomatrixserverlib.SigningIdentity{
-			ServerName: serverName,
-			KeyID:      b.Cfg.Global.KeyID,      // TODO: Per-virtual host key
-			PrivateKey: b.Cfg.Global.PrivateKey, // TODO: Per-virtual host key
-		})
-	}
+	identities := b.Cfg.Global.SigningIdentities()
 	if b.Cfg.Global.DisableFederation {
 		return gomatrixserverlib.NewFederationClient(
 			identities, gomatrixserverlib.WithTransport(noOpHTTPTransport),

setup/config/config.go

@@ -231,6 +231,21 @@ func loadConfig(
 		return nil, err
 	}
 
+	for _, v := range c.Global.VirtualHosts {
+		if v.KeyValidityPeriod == 0 {
+			v.KeyValidityPeriod = c.Global.KeyValidityPeriod
+		}
+		if v.PrivateKeyPath == "" {
+			v.KeyID = c.Global.KeyID
+			v.PrivateKey = c.Global.PrivateKey
+			continue
+		}
+		privateKeyPath := absPath(basePath, v.PrivateKeyPath)
+		if v.KeyID, v.PrivateKey, err = LoadMatrixKey(privateKeyPath, readFile); err != nil {
+			return nil, err
+		}
+	}
+
 	for _, key := range c.Global.OldVerifyKeys {
 		switch {
 		case key.PrivateKeyPath != "":

setup/config/config_global.go

@@ -16,7 +16,7 @@ type Global struct {
 	ServerName gomatrixserverlib.ServerName `yaml:"server_name"`
 
 	// The secondary server names, used for virtual hosting.
-	SecondaryServerNames []gomatrixserverlib.ServerName `yaml:"secondary_server_names"`
+	VirtualHosts []*VirtualHost `yaml:"virtual_hosts"`
 
 	// Path to the private key which will be used to sign requests and events.
 	PrivateKeyPath Path `yaml:"private_key"`
@@ -128,8 +128,8 @@ func (c *Global) IsLocalServerName(serverName gomatrixserverlib.ServerName) bool
 	if c.ServerName == serverName {
 		return true
 	}
-	for _, secondaryName := range c.SecondaryServerNames {
-		if secondaryName == serverName {
+	for _, v := range c.VirtualHosts {
+		if v.ServerName == serverName {
 			return true
 		}
 	}
@@ -148,22 +148,49 @@ func (c *Global) SplitLocalID(sigil byte, id string) (string, gomatrixserverlib.
 }
 
 func (c *Global) SigningIdentities() []*gomatrixserverlib.SigningIdentity {
-	identities := make([]*gomatrixserverlib.SigningIdentity, 0, len(c.SecondaryServerNames)+1)
+	identities := make([]*gomatrixserverlib.SigningIdentity, 0, len(c.VirtualHosts)+1)
 	identities = append(identities, &gomatrixserverlib.SigningIdentity{
 		ServerName: c.ServerName,
 		KeyID:      c.KeyID,
 		PrivateKey: c.PrivateKey,
 	})
-	for _, serverName := range c.SecondaryServerNames {
-		identities = append(identities, &gomatrixserverlib.SigningIdentity{
-			ServerName: serverName,
-			KeyID:      c.KeyID,
-			PrivateKey: c.PrivateKey,
-		})
+	for _, v := range c.VirtualHosts {
+		identities = append(identities, v.SigningIdentity())
 	}
 	return identities
 }
 
+type VirtualHost struct {
+	// The server name of the virtual host.
+	ServerName gomatrixserverlib.ServerName `yaml:"server_name"`
+
+	// The key ID of the private key. If not specified, the default global key ID
+	// will be used instead.
+	KeyID gomatrixserverlib.KeyID `yaml:"key_id"`
+
+	// Path to the private key. If not specified, the default global private key
+	// will be used instead.
+	PrivateKeyPath Path `yaml:"private_key"`
+
+	// The private key itself.
+	PrivateKey ed25519.PrivateKey `yaml:"-"`
+
+	// How long a remote server can cache our server key for before requesting it again.
+	// Increasing this number will reduce the number of requests made by remote servers
+	// for our key, but increases the period a compromised key will be considered valid
+	// by remote servers.
+	// Defaults to 24 hours.
+	KeyValidityPeriod time.Duration `yaml:"key_validity_period"`
+}
+
+func (v *VirtualHost) SigningIdentity() *gomatrixserverlib.SigningIdentity {
+	return &gomatrixserverlib.SigningIdentity{
+		ServerName: v.ServerName,
+		KeyID:      v.KeyID,
+		PrivateKey: v.PrivateKey,
+	}
+}
+
 type OldVerifyKeys struct {
 	// Path to the private key.
 	PrivateKeyPath Path `yaml:"private_key"`