Perspective key fetching, some federation room join fixes (#975)

* Update gomatrixserverlib

* Test matrix.org as perspective key server

* Base64 decode better

* Optional strict validity checking in gmsl

* Update gomatrixserverlib

* Attempt to find missing auth events over federation (this shouldn't happen but I am guessing there is a synapse bug involved where we don't get all of the auth events)

* Update gomatrixserverlib, debug logging

* Remove debugging output

* More verbose debugging

* Print outliers

* Increase timeouts for testing, observe contexts before trying to join over more servers

* Don't block on roomserver (experimental)

* Don't block on roomserver

* Update gomatrixserverlib

* Update gomatrixserverlib

* Configurable perspective key fetchers

* Output number of configured keys for perspective

* Example perspective config included

* Undo debug stack trace

* Undo debug stack trace

* Restore original HTTP listener in monolith

* Fix lint

* Review comments

* Set default HTTP server timeout to 5 minutes now, block again when joining

* Don't use HTTP address for HTTPS whoops

* Update gomatrixserverlib

* Update gomatrixserverlib

* Update gomatrixserverlib

* Actually add perspectives

* Actually add perspectives

* Update gomatrixserverlib
This commit is contained in:
Neil Alexander 2020-04-20 17:42:34 +01:00 committed by GitHub
parent c62844234b
commit 9045b8e89f
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
15 changed files with 189 additions and 40 deletions

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@ -32,6 +32,7 @@ import (
"github.com/matrix-org/gomatrix"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
"github.com/sirupsen/logrus"
)
// JoinRoomByIDOrAlias implements the "/join/{roomIDOrAlias}" API.
@ -290,7 +291,15 @@ func (r joinRoomReq) joinRoomUsingServers(
// There was a problem talking to one of the servers.
util.GetLogger(r.req.Context()).WithError(lastErr).WithField("server", server).Warn("Failed to join room using server")
// Try the next server.
continue
if r.req.Context().Err() != nil {
// The request context has expired so don't bother trying any
// more servers - they will immediately fail due to the expired
// context.
break
} else {
// The request context hasn't expired yet so try the next server.
continue
}
}
return *response
}
@ -365,16 +374,22 @@ func (r joinRoomReq) joinRoomUsingServer(roomID string, server gomatrixserverlib
return nil, fmt.Errorf("r.federation.SendJoin: %w", err)
}
if err = respSendJoin.Check(r.req.Context(), r.keyRing, event); err != nil {
return nil, fmt.Errorf("respSendJoin: %w", err)
if err = r.checkSendJoinResponse(event, server, respMakeJoin, respSendJoin); err != nil {
return nil, err
}
util.GetLogger(r.req.Context()).WithFields(logrus.Fields{
"room_id": roomID,
"num_auth_events": len(respSendJoin.AuthEvents),
"num_state_events": len(respSendJoin.StateEvents),
}).Info("Room join signature and auth verification passed")
if err = r.producer.SendEventWithState(
r.req.Context(),
gomatrixserverlib.RespState(respSendJoin.RespState),
event.Headered(respMakeJoin.RoomVersion),
); err != nil {
return nil, fmt.Errorf("r.producer.SendEventWithState: %w", err)
util.GetLogger(r.req.Context()).WithError(err).Error("r.producer.SendEventWithState")
}
return &util.JSONResponse{
@ -385,3 +400,49 @@ func (r joinRoomReq) joinRoomUsingServer(roomID string, server gomatrixserverlib
}{roomID},
}, nil
}
// checkSendJoinResponse checks that all of the signatures are correct
// and that the join is allowed by the supplied state.
func (r joinRoomReq) checkSendJoinResponse(
event gomatrixserverlib.Event,
server gomatrixserverlib.ServerName,
respMakeJoin gomatrixserverlib.RespMakeJoin,
respSendJoin gomatrixserverlib.RespSendJoin,
) error {
// A list of events that we have retried, if they were not included in
// the auth events supplied in the send_join.
retries := map[string]bool{}
retryCheck:
// TODO: Can we expand Check here to return a list of missing auth
// events rather than failing one at a time?
if err := respSendJoin.Check(r.req.Context(), r.keyRing, event); err != nil {
switch e := err.(type) {
case gomatrixserverlib.MissingAuthEventError:
// Check that we haven't already retried for this event, prevents
// us from ending up in endless loops
if !retries[e.AuthEventID] {
// Ask the server that we're talking to right now for the event
tx, txerr := r.federation.GetEvent(r.req.Context(), server, e.AuthEventID)
if txerr != nil {
return fmt.Errorf("r.federation.GetEvent: %w", txerr)
}
// For each event returned, add it to the auth events.
for _, pdu := range tx.PDUs {
ev, everr := gomatrixserverlib.NewEventFromUntrustedJSON(pdu, respMakeJoin.RoomVersion)
if everr != nil {
return fmt.Errorf("gomatrixserverlib.NewEventFromUntrustedJSON: %w", everr)
}
respSendJoin.AuthEvents = append(respSendJoin.AuthEvents, ev)
}
// Mark the event as retried and then give the check another go.
retries[e.AuthEventID] = true
goto retryCheck
}
return fmt.Errorf("respSendJoin (after retries): %w", e)
default:
return fmt.Errorf("respSendJoin: %w", err)
}
}
return nil
}

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@ -33,7 +33,7 @@ func main() {
deviceDB := base.CreateDeviceDB()
keyDB := base.CreateKeyDB()
federation := base.CreateFederationClient()
keyRing := keydb.CreateKeyRing(federation.Client, keyDB)
keyRing := keydb.CreateKeyRing(federation.Client, keyDB, cfg.Matrix.KeyPerspectives)
asQuery := base.CreateHTTPAppServiceAPIs()
alias, input, query := base.CreateHTTPRoomserverAPIs()

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@ -146,7 +146,7 @@ func main() {
deviceDB := base.Base.CreateDeviceDB()
keyDB := createKeyDB(base)
federation := createFederationClient(base)
keyRing := keydb.CreateKeyRing(federation.Client, keyDB)
keyRing := keydb.CreateKeyRing(federation.Client, keyDB, cfg.Matrix.KeyPerspectives)
alias, input, query := roomserver.SetupRoomServerComponent(&base.Base)
eduInputAPI := eduserver.SetupEDUServerComponent(&base.Base, cache.New())

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@ -33,7 +33,7 @@ func main() {
keyDB := base.CreateKeyDB()
federation := base.CreateFederationClient()
federationSender := base.CreateHTTPFederationSenderAPIs()
keyRing := keydb.CreateKeyRing(federation.Client, keyDB)
keyRing := keydb.CreateKeyRing(federation.Client, keyDB, cfg.Matrix.KeyPerspectives)
alias, input, query := base.CreateHTTPRoomserverAPIs()
asQuery := base.CreateHTTPAppServiceAPIs()

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@ -55,7 +55,7 @@ func main() {
deviceDB := base.CreateDeviceDB()
keyDB := base.CreateKeyDB()
federation := base.CreateFederationClient()
keyRing := keydb.CreateKeyRing(federation.Client, keyDB)
keyRing := keydb.CreateKeyRing(federation.Client, keyDB, cfg.Matrix.KeyPerspectives)
alias, input, query := roomserver.SetupRoomServerComponent(base)
eduInputAPI := eduserver.SetupEDUServerComponent(base, cache.New())
@ -90,16 +90,26 @@ func main() {
// Expose the matrix APIs directly rather than putting them under a /api path.
go func() {
logrus.Info("Listening on ", *httpBindAddr)
logrus.Fatal(http.ListenAndServe(*httpBindAddr, nil))
serv := http.Server{
Addr: *httpBindAddr,
WriteTimeout: basecomponent.HTTPServerTimeout,
}
logrus.Info("Listening on ", serv.Addr)
logrus.Fatal(serv.ListenAndServe())
}()
// Handle HTTPS if certificate and key are provided
go func() {
if *certFile != "" && *keyFile != "" {
logrus.Info("Listening on ", *httpsBindAddr)
logrus.Fatal(http.ListenAndServeTLS(*httpsBindAddr, *certFile, *keyFile, nil))
}
}()
if *certFile != "" && *keyFile != "" {
go func() {
serv := http.Server{
Addr: *httpsBindAddr,
WriteTimeout: basecomponent.HTTPServerTimeout,
}
logrus.Info("Listening on ", serv.Addr)
logrus.Fatal(serv.ListenAndServeTLS(*certFile, *keyFile))
}()
}
// We want to block forever to let the HTTP and HTTPS handler serve the APIs
select {}

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@ -60,6 +60,9 @@ type BaseDendrite struct {
KafkaProducer sarama.SyncProducer
}
const HTTPServerTimeout = time.Minute * 5
const HTTPClientTimeout = time.Second * 30
// NewBaseDendrite creates a new instance to be used by a component.
// The componentName is used for logging purposes, and should be a friendly name
// of the compontent running, e.g. "SyncAPI"
@ -80,14 +83,12 @@ func NewBaseDendrite(cfg *config.Dendrite, componentName string) *BaseDendrite {
kafkaConsumer, kafkaProducer = setupKafka(cfg)
}
const defaultHTTPTimeout = 30 * time.Second
return &BaseDendrite{
componentName: componentName,
tracerCloser: closer,
Cfg: cfg,
APIMux: mux.NewRouter().UseEncodedPath(),
httpClient: &http.Client{Timeout: defaultHTTPTimeout},
httpClient: &http.Client{Timeout: HTTPClientTimeout},
KafkaConsumer: kafkaConsumer,
KafkaProducer: kafkaProducer,
}
@ -209,16 +210,20 @@ func (b *BaseDendrite) SetupAndServeHTTP(bindaddr string, listenaddr string) {
addr = listenaddr
}
serv := http.Server{
Addr: addr,
WriteTimeout: HTTPServerTimeout,
}
common.SetupHTTPAPI(http.DefaultServeMux, common.WrapHandlerInCORS(b.APIMux), b.Cfg)
logrus.Infof("Starting %s server on %s", b.componentName, addr)
err := http.ListenAndServe(addr, nil)
logrus.Infof("Starting %s server on %s", b.componentName, serv.Addr)
err := serv.ListenAndServe()
if err != nil {
logrus.WithError(err).Fatal("failed to serve http")
}
logrus.Infof("Stopped %s server on %s", b.componentName, addr)
logrus.Infof("Stopped %s server on %s", b.componentName, serv.Addr)
}
// setupKafka creates kafka consumer/producer pair from the config.

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@ -99,6 +99,9 @@ type Dendrite struct {
// If set disables new users from registering (except via shared
// secrets)
RegistrationDisabled bool `yaml:"registration_disabled"`
// Perspective keyservers, to use as a backup when direct key fetch
// requests don't succeed
KeyPerspectives KeyPerspectives `yaml:"key_perspectives"`
} `yaml:"matrix"`
// The configuration specific to the media repostitory.
@ -285,6 +288,21 @@ type Dendrite struct {
} `yaml:"-"`
}
// KeyPerspectives are used to configure perspective key servers for
// retrieving server keys.
type KeyPerspectives []struct {
// The server name of the perspective key server
ServerName gomatrixserverlib.ServerName `yaml:"server_name"`
// Server keys for the perspective user, used to verify the
// keys have been signed by the perspective server
Keys []struct {
// The key ID, e.g. ed25519:auto
KeyID gomatrixserverlib.KeyID `yaml:"key_id"`
// The public key in base64 unpadded format
PublicKey string `yaml:"public_key"`
} `yaml:"keys"`
}
// A Path on the filesystem.
type Path string

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@ -14,19 +14,61 @@
package keydb
import "github.com/matrix-org/gomatrixserverlib"
import (
"encoding/base64"
"github.com/matrix-org/dendrite/common/config"
"github.com/matrix-org/gomatrixserverlib"
"github.com/sirupsen/logrus"
"golang.org/x/crypto/ed25519"
)
// CreateKeyRing creates and configures a KeyRing object.
//
// It creates the necessary key fetchers and collects them into a KeyRing
// backed by the given KeyDatabase.
func CreateKeyRing(client gomatrixserverlib.Client,
keyDB gomatrixserverlib.KeyDatabase) gomatrixserverlib.KeyRing {
return gomatrixserverlib.KeyRing{
keyDB gomatrixserverlib.KeyDatabase,
cfg config.KeyPerspectives) gomatrixserverlib.KeyRing {
fetchers := gomatrixserverlib.KeyRing{
KeyFetchers: []gomatrixserverlib.KeyFetcher{
// TODO: Use perspective key fetchers for production.
&gomatrixserverlib.DirectKeyFetcher{Client: client},
&gomatrixserverlib.DirectKeyFetcher{
Client: client,
},
},
KeyDatabase: keyDB,
}
logrus.Info("Enabled direct key fetcher")
var b64e = base64.StdEncoding.WithPadding(base64.NoPadding)
for _, ps := range cfg {
perspective := &gomatrixserverlib.PerspectiveKeyFetcher{
PerspectiveServerName: ps.ServerName,
PerspectiveServerKeys: map[gomatrixserverlib.KeyID]ed25519.PublicKey{},
Client: client,
}
for _, key := range ps.Keys {
rawkey, err := b64e.DecodeString(key.PublicKey)
if err != nil {
logrus.WithError(err).WithFields(logrus.Fields{
"server_name": ps.ServerName,
"public_key": key.PublicKey,
}).Warn("Couldn't parse perspective key")
continue
}
perspective.PerspectiveServerKeys[key.KeyID] = rawkey
}
fetchers.KeyFetchers = append(fetchers.KeyFetchers, perspective)
logrus.WithFields(logrus.Fields{
"server_name": ps.ServerName,
"num_public_keys": len(ps.Keys),
}).Info("Enabled perspective key fetcher")
}
return fetchers
}

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@ -17,6 +17,14 @@ matrix:
trusted_third_party_id_servers:
- vector.im
- matrix.org
# Perspective key servers which are used when direct key requests fail
#key_perspectives:
# - server_name: matrix.org
# keys:
# - key_id: ed25519:auto
# public_key: Noi6WqcDj0QmPxCNQqgezwTlBKrfqehY1u2FyWP9uYw
# - key_id: ed25519:a_RXGa
# public_key: l8Hft5qXKn1vfHrg3p4+W8gELQVo8N13JkluMfmn2sQ
# The media repository config
media:

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@ -63,9 +63,10 @@ func Invite(
// Check that the event is signed by the server sending the request.
redacted := event.Redact()
verifyRequests := []gomatrixserverlib.VerifyJSONRequest{{
ServerName: event.Origin(),
Message: redacted.JSON(),
AtTS: event.OriginServerTS(),
ServerName: event.Origin(),
Message: redacted.JSON(),
AtTS: event.OriginServerTS(),
StrictValidityChecking: true,
}}
verifyResults, err := keys.VerifyJSONs(httpReq.Context(), verifyRequests)
if err != nil {

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@ -196,9 +196,10 @@ func SendJoin(
// Check that the event is signed by the server sending the request.
redacted := event.Redact()
verifyRequests := []gomatrixserverlib.VerifyJSONRequest{{
ServerName: event.Origin(),
Message: redacted.JSON(),
AtTS: event.OriginServerTS(),
ServerName: event.Origin(),
Message: redacted.JSON(),
AtTS: event.OriginServerTS(),
StrictValidityChecking: true,
}}
verifyResults, err := keys.VerifyJSONs(httpReq.Context(), verifyRequests)
if err != nil {

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@ -145,9 +145,10 @@ func SendLeave(
// Check that the event is signed by the server sending the request.
redacted := event.Redact()
verifyRequests := []gomatrixserverlib.VerifyJSONRequest{{
ServerName: event.Origin(),
Message: redacted.JSON(),
AtTS: event.OriginServerTS(),
ServerName: event.Origin(),
Message: redacted.JSON(),
AtTS: event.OriginServerTS(),
StrictValidityChecking: true,
}}
verifyResults, err := keys.VerifyJSONs(httpReq.Context(), verifyRequests)
if err != nil {

2
go.mod
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@ -17,7 +17,7 @@ require (
github.com/matrix-org/go-http-js-libp2p v0.0.0-20200318135427-31631a9ef51f
github.com/matrix-org/go-sqlite3-js v0.0.0-20200325174927-327088cdef10
github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26
github.com/matrix-org/gomatrixserverlib v0.0.0-20200416165239-837ed63a0046
github.com/matrix-org/gomatrixserverlib v0.0.0-20200420162430-9662fc15e7e2
github.com/matrix-org/naffka v0.0.0-20200127221512-0716baaabaf1
github.com/matrix-org/util v0.0.0-20190711121626-527ce5ddefc7
github.com/mattn/go-sqlite3 v2.0.3+incompatible

5
go.sum
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@ -364,8 +364,8 @@ github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26 h1:Hr3zjRsq2bh
github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26/go.mod h1:3fxX6gUjWyI/2Bt7J1OLhpCzOfO/bB3AiX0cJtEKud0=
github.com/matrix-org/gomatrixserverlib v0.0.0-20200124100636-0c2ec91d1df5 h1:kmRjpmFOenVpOaV/DRlo9p6z/IbOKlUC+hhKsAAh8Qg=
github.com/matrix-org/gomatrixserverlib v0.0.0-20200124100636-0c2ec91d1df5/go.mod h1:FsKa2pWE/bpQql9H7U4boOPXFoJX/QcqaZZ6ijLkaZI=
github.com/matrix-org/gomatrixserverlib v0.0.0-20200416165239-837ed63a0046 h1:R7iYuS8hhXdrqs5OSNF3Y3chaIFWU9KLpnzjjsdJkMU=
github.com/matrix-org/gomatrixserverlib v0.0.0-20200416165239-837ed63a0046/go.mod h1:FsKa2pWE/bpQql9H7U4boOPXFoJX/QcqaZZ6ijLkaZI=
github.com/matrix-org/gomatrixserverlib v0.0.0-20200420162430-9662fc15e7e2 h1:XTg0bCZ+fQlWZHi1CinNecYfg2SFhyRNnGxKxXbLubg=
github.com/matrix-org/gomatrixserverlib v0.0.0-20200420162430-9662fc15e7e2/go.mod h1:FsKa2pWE/bpQql9H7U4boOPXFoJX/QcqaZZ6ijLkaZI=
github.com/matrix-org/naffka v0.0.0-20200127221512-0716baaabaf1 h1:osLoFdOy+ChQqVUn2PeTDETFftVkl4w9t/OW18g3lnk=
github.com/matrix-org/naffka v0.0.0-20200127221512-0716baaabaf1/go.mod h1:cXoYQIENbdWIQHt1SyCo6Bl3C3raHwJ0wgVrXHSqf+A=
github.com/matrix-org/util v0.0.0-20171127121716-2e2df66af2f5 h1:W7l5CP4V7wPyPb4tYE11dbmeAOwtFQBTW0rf4OonOS8=
@ -721,4 +721,5 @@ gopkg.in/yaml.v2 v2.2.5 h1:ymVxjfMaHvXD8RqPRmzHHsB3VvucivSkIAvJFDI5O3c=
gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099 h1:XJP7lxbSxWLOMNdBE4B/STaqVy6L73o0knwj2vIlxnw=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

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@ -252,3 +252,4 @@ Outbound federation can send invites via v2 API
User can invite local user to room with version 3
User can invite local user to room with version 4
A pair of servers can establish a join in a v2 room
Can logout all devices