matrix: end-to-end encryption by default

Existing chats will remain unencrypted but new ones will be.

LICENSE

@@ -1,3 +1,5 @@
+---jfa-go---
+
 MIT License
 
 Copyright (c) 2021 Harvey Tindall
@@ -19,3 +21,4 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
+

api.go

@@ -2571,7 +2571,7 @@ func (app *appContext) MatrixConnect(gc *gin.Context) {
 	if app.storage.matrix == nil {
 		app.storage.matrix = map[string]MatrixUser{}
 	}
-	roomID, err := app.matrix.CreateRoom(req.UserID)
+	roomID, encrypted, err := app.matrix.CreateRoom(req.UserID)
 	if err != nil {
 		app.err.Printf("Matrix: Failed to create room: %v", err)
 		respondBool(500, false, gc)
@@ -2582,7 +2582,9 @@ func (app *appContext) MatrixConnect(gc *gin.Context) {
 		RoomID:    string(roomID),
 		Lang:      "en-us",
 		Contact:   true,
+		Encrypted: encrypted,
 	}
+	app.matrix.isEncrypted[roomID] = encrypted
 	if err := app.storage.storeMatrixUsers(); err != nil {
 		app.err.Printf("Failed to store Matrix users: %v", err)
 		respondBool(500, false, gc)

config.go

@@ -47,6 +47,9 @@ func (app *appContext) loadConfig() error {
 	for _, key := range []string{"user_configuration", "user_displayprefs", "user_profiles", "ombi_template", "invites", "emails", "user_template", "custom_emails", "users", "telegram_users", "discord_users", "matrix_users", "announcements"} {
 		app.config.Section("files").Key(key).SetValue(app.config.Section("files").Key(key).MustString(filepath.Join(app.dataPath, (key + ".json"))))
 	}
+	for _, key := range []string{"matrix_sql"} {
+		app.config.Section("files").Key(key).SetValue(app.config.Section("files").Key(key).MustString(filepath.Join(app.dataPath, (key + ".db"))))
+	}
 	app.URLBase = strings.TrimSuffix(app.config.Section("ui").Key("url_base").MustString(""), "/")
 	app.config.Section("email").Key("no_username").SetValue(strconv.FormatBool(app.config.Section("email").Key("no_username").MustBool(false)))
 

config/config-base.json

@@ -1324,6 +1324,14 @@
                     "value": "",
                     "description": "Stores matrix user IDs and language preferences."
                 },
+                "matrix_sql": {
+                    "name": "Matrix encryption DB",
+                    "required": false,
+                    "requires_restart": false,
+                    "type": "text",
+                    "value": "",
+                    "description": "Stores cryptographic material for Matrix end-to-end encryption."
+                },
                 "discord_users": {
                     "name": "Discord users",
                     "required": false,

email.go

@@ -819,7 +819,7 @@ func (app *appContext) sendByID(email *Message, ID ...string) error {
 			}
 		}
 		if mxChat, ok := app.storage.matrix[id]; ok && mxChat.Contact && matrixEnabled {
-			err = app.matrix.Send(email, mxChat.RoomID)
+			err = app.matrix.Send(email, mxChat)
 			if err != nil {
 				return err
 			}

go.mod

@@ -56,4 +56,5 @@ require (
 	google.golang.org/protobuf v1.25.0 // indirect
 	gopkg.in/ini.v1 v1.62.0
 	maunium.net/go/mautrix v0.9.14
+	modernc.org/sqlite v1.11.2
 )

go.sum

@@ -33,6 +33,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
+github.com/dustin/go-humanize v1.0.0 h1:VSnTsYCnlFHaM2/igO1h6X3HA71jcobQuxemgkq4zYo=
+github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
 github.com/elazarl/go-bindata-assetfs v1.0.0/go.mod h1:v+YaWX3bdea5J/mo8dSETolEo7R71Vk1u8bnjau5yw4=
 github.com/emersion/go-autostart v0.0.0-20210130080809-00ed301c8e9a h1:M88ob4TyDnEqNuL3PgsE/p3bDujfspnulR+0dQWNYZs=
 github.com/emersion/go-autostart v0.0.0-20210130080809-00ed301c8e9a/go.mod h1:buzQsO8HHkZX2Q45fdfGH1xejPjuDQaXH8btcYMFzPM=
@@ -141,8 +143,9 @@ github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5a
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
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 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.0 h1:/QaMHBdZ26BB3SSst0Iwl10Epc+xhTquomWX0oZEB6w=
 github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.3 h1:x95R7cp+rSeeqAMI2knLtQ0DKlaBhv2NrtrOvafPHRo=
+github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
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 github.com/google/uuid v1.1.2 h1:EVhdT+1Kseyi1/pUmXKaFxYsDNy9RQYkMWRH68J/W7Y=
@@ -173,6 +176,8 @@ github.com/json-iterator/go v1.1.10 h1:Kz6Cvnvv2wGdaG/V8yMvfkmNiXq9Ya2KUv4rouJJr
 github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
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 github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
+github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 h1:Z9n2FFNUXsshfwJMBgNA0RU6/i7WVaAegv3PtuIHPMs=
+github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51/go.mod h1:CzGEWj7cYgsdH8dAjBGEr58BoE7ScuLd+fwFZ44+/x8=
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@@ -183,6 +188,7 @@ github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
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@@ -202,6 +208,7 @@ github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hd
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@@ -223,6 +230,8 @@ github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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@@ -252,9 +261,13 @@ github.com/swaggo/swag v1.7.0 h1:5bCA/MTLQoIqDXXyHfOpMeDvL9j68OY/udlK4pQoo4E=
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@@ -338,6 +351,8 @@ golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200515095857-1151b9dac4a9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201126233918-771906719818/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210319071255-635bc2c9138d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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@@ -365,6 +380,7 @@ golang.org/x/tools v0.0.0-20190611222205-d73e1c7e250b/go.mod h1:/rFqwRUd4F7ZHNgw
 golang.org/x/tools v0.0.0-20190614205625-5aca471b1d59/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
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@@ -413,6 +429,36 @@ gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 h1:tQIYjPdBoyREyB9XMu+nnTclp
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+modernc.org/sqlite v1.11.2 h1:ShWQpeD3ag/bmx6TqidBlIWonWmQaSQKls3aenCbt+w=
+modernc.org/sqlite v1.11.2/go.mod h1:+mhs/P1ONd+6G7hcAs6irwDi/bjTQ7nLW6LHRBsEa3A=
+modernc.org/strutil v1.1.1 h1:xv+J1BXY3Opl2ALrBwyfEikFAj8pmqcpnfmuwUwcozs=
+modernc.org/strutil v1.1.1/go.mod h1:DE+MQQ/hjKBZS2zNInV5hhcipt5rLPWkmpbGeW5mmdw=
+modernc.org/tcl v1.5.5 h1:N03RwthgTR/l/eQvz3UjfYnvVVj1G2sZqzFGfoD4HE4=
+modernc.org/tcl v1.5.5/go.mod h1:ADkaTUuwukkrlhqwERyq0SM8OvyXo7+TjFz7yAF56EI=
+modernc.org/token v1.0.0 h1:a0jaWiNMDhDUtqOj09wvjWWAqd3q7WpBulmL9H2egsk=
+modernc.org/token v1.0.0/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM=
+modernc.org/z v1.0.1 h1:WyIDpEpAIx4Hel6q/Pcgj/VhaQV5XPJ2I6ryIYbjnpc=
+modernc.org/z v1.0.1/go.mod h1:8/SRk5C/HgiQWCgXdfpb+1RvhORdkz5sw72d3jjtyqA=

main.go

@@ -652,7 +652,8 @@ func main() {
 			Exit(r)
 		}
 	}()
-	defer logOutput()()
+	f := logOutput()
+	defer f()
 	printVersion()
 	SOCK = filepath.Join(temp, SOCK)
 	fmt.Println("Socket:", SOCK)

matrix.go

@@ -4,10 +4,15 @@ import (
 	"fmt"
 	"strings"
 
+	"database/sql"
+
 	"github.com/gomarkdown/markdown"
 	gomatrix "maunium.net/go/mautrix"
+	"maunium.net/go/mautrix/crypto"
 	"maunium.net/go/mautrix/event"
 	"maunium.net/go/mautrix/id"
+
+	_ "modernc.org/sqlite"
 )
 
 type MatrixDaemon struct {
@@ -17,6 +22,10 @@ type MatrixDaemon struct {
 	userID          id.UserID
 	tokens          map[string]UnverifiedUser // Map of tokens to users
 	languages       map[id.RoomID]string      // Map of roomIDs to language codes
+	isEncrypted     map[id.RoomID]bool
+	cryptoStore     *crypto.SQLCryptoStore
+	olm             *crypto.OlmMachine
+	db              *sql.DB
 	app             *appContext
 }
 
@@ -27,17 +36,46 @@ type UnverifiedUser struct {
 
 type MatrixUser struct {
 	RoomID    string
+	Encrypted bool
 	UserID    string
 	Lang      string
 	Contact   bool
 }
 
-type MatrixIdentifier struct {
+func (m *MatrixDaemon) IsEncrypted(roomID id.RoomID) bool {
-	User      string `json:"user"`
+	return m.isEncrypted[roomID]
-	IdentType string `json:"type"`
 }
 
-func (m MatrixIdentifier) Type() string { return m.IdentType }
+func (m *MatrixDaemon) GetEncryptionEvent(roomID id.RoomID) *event.EncryptionEventContent {
+	return &event.EncryptionEventContent{
+		Algorithm:              id.AlgorithmMegolmV1,
+		RotationPeriodMillis:   7 * 24 * 60 * 60 * 1000,
+		RotationPeriodMessages: 100,
+	}
+}
+
+// Users are assumed to only have one common channel with the bot, so we can stub this out.
+func (m *MatrixDaemon) FindSharedRooms(userID id.UserID) []id.RoomID { return []id.RoomID{} }
+
+type olmLogger struct {
+	app *appContext
+}
+
+func (o olmLogger) Error(message string, args ...interface{}) {
+	o.app.err.Printf("OLM: "+message+"\n", args)
+}
+
+func (o olmLogger) Warn(message string, args ...interface{}) {
+	o.app.info.Printf("OLM: "+message+"\n", args)
+}
+
+func (o olmLogger) Debug(message string, args ...interface{}) {
+	o.app.debug.Printf("OLM: "+message+"\n", args)
+}
+
+func (o olmLogger) Trace(message string, args ...interface{}) {
+	o.app.debug.Printf("OLM [TRACE]: "+message+"\n", args)
+}
 
 var matrixFilter = gomatrix.Filter{
 	Room: gomatrix.RoomFilter{
@@ -68,6 +106,7 @@ func newMatrixDaemon(app *appContext) (d *MatrixDaemon, err error) {
 		userID:          id.UserID(matrix.Key("user_id").String()),
 		tokens:          map[string]UnverifiedUser{},
 		languages:       map[id.RoomID]string{},
+		isEncrypted:     map[id.RoomID]bool{},
 		app:             app,
 	}
 	d.bot, err = gomatrix.NewClient(homeserver, d.userID, token)
@@ -80,6 +119,19 @@ func newMatrixDaemon(app *appContext) (d *MatrixDaemon, err error) {
 		if user.Lang != "" {
 			d.languages[id.RoomID(user.RoomID)] = user.Lang
 		}
+		d.isEncrypted[id.RoomID(user.RoomID)] = user.Encrypted
+	}
+	d.db, err = sql.Open("sqlite", app.config.Section("files").Key("matrix_sql").String())
+	olmLog := &olmLogger{app}
+	d.cryptoStore = crypto.NewSQLCryptoStore(d.db, "sqlite3", "jfa-go", "jfa-go", []byte("jfa-go"), olmLog)
+	err = d.cryptoStore.CreateTables()
+	if err != nil {
+		return
+	}
+	d.olm = crypto.NewOlmMachine(d.bot, olmLog, d.cryptoStore, crypto.StateStore(d))
+	err = d.olm.Load()
+	if err != nil {
+		return
 	}
 	return
 }
@@ -108,7 +160,20 @@ func (d *MatrixDaemon) generateAccessToken(homeserver, username, password string
 func (d *MatrixDaemon) run() {
 	d.app.info.Println("Starting Matrix bot daemon")
 	syncer := d.bot.Syncer.(*gomatrix.DefaultSyncer)
-	syncer.OnEventType(event.NewEventType("m.room.message"), d.handleMessage)
+	syncer.OnEventType(event.EventMessage, d.handleMessage)
+	syncer.OnEventType(event.EventEncrypted, func(source gomatrix.EventSource, evt *event.Event) {
+		decrypted, err := d.olm.DecryptMegolmEvent(evt)
+		if err != nil {
+			d.app.err.Printf("Failed to decrypt Matrix message: %v", err)
+			return
+		}
+		d.handleMessage(source, decrypted)
+	})
+	syncer.OnSync(d.olm.ProcessSyncResponse)
+	syncer.OnEventType(event.StateMember, func(source gomatrix.EventSource, evt *event.Event) {
+		d.olm.HandleMemberEvent(evt)
+	})
+
 	// syncer.OnEventType("m.room.member", d.handleMembership)
 	if err := d.bot.Sync(); err != nil {
 		d.app.err.Printf("Matrix sync failed: %v", err)
@@ -117,6 +182,7 @@ func (d *MatrixDaemon) run() {
 
 func (d *MatrixDaemon) Shutdown() {
 	d.bot.StopSync()
+	d.db.Close()
 	d.Stopped = true
 	close(d.ShutdownChannel)
 }
@@ -170,20 +236,32 @@ func (d *MatrixDaemon) commandLang(evt *event.Event, code, lang string) {
 	}
 }
 
-func (d *MatrixDaemon) CreateRoom(userID string) (id.RoomID, error) {
+func (d *MatrixDaemon) CreateRoom(userID string) (roomID id.RoomID, encrypted bool, err error) {
-	room, err := d.bot.CreateRoom(&gomatrix.ReqCreateRoom{
+	var room *gomatrix.RespCreateRoom
+	room, err = d.bot.CreateRoom(&gomatrix.ReqCreateRoom{
 		Visibility: "private",
 		Invite:     []id.UserID{id.UserID(userID)},
 		Topic:      d.app.config.Section("matrix").Key("topic").String(),
 	})
 	if err != nil {
-		return "", err
+		return
 	}
-	return room.RoomID, nil
+	_, err = d.bot.SendStateEvent(room.RoomID, event.StateEncryption, "", &event.EncryptionEventContent{
+		Algorithm:              id.AlgorithmMegolmV1,
+		RotationPeriodMillis:   7 * 24 * 60 * 60 * 1000,
+		RotationPeriodMessages: 100,
+	})
+	if err == nil {
+		encrypted = true
+	} else {
+		d.app.debug.Printf("Matrix: Failed to enable encryption in room: %v", err)
+	}
+	roomID = room.RoomID
+	return
 }
 
 func (d *MatrixDaemon) SendStart(userID string) (ok bool) {
-	roomID, err := d.CreateRoom(userID)
+	roomID, encrypted, err := d.CreateRoom(userID)
 	if err != nil {
 		d.app.err.Printf("Failed to create room for user \"%s\": %v", userID, err)
 		return
@@ -196,8 +274,10 @@ func (d *MatrixDaemon) SendStart(userID string) (ok bool) {
 			RoomID:    string(roomID),
 			UserID:    userID,
 			Lang:      lang,
+			Encrypted: encrypted,
 		},
 	}
+	d.isEncrypted[roomID] = encrypted
 	_, err = d.bot.SendText(
 		roomID,
 		d.app.storage.lang.Telegram[lang].Strings.get("matrixStartMessage")+"\n\n"+pin+"\n\n"+
@@ -211,24 +291,48 @@ func (d *MatrixDaemon) SendStart(userID string) (ok bool) {
 	return
 }
 
-func (d *MatrixDaemon) Send(message *Message, roomID ...string) (err error) {
+func (d *MatrixDaemon) Send(message *Message, users ...MatrixUser) (err error) {
 	md := ""
 	if message.Markdown != "" {
 		// Convert images to links
 		md = string(markdown.ToHTML([]byte(strings.ReplaceAll(message.Markdown, "![", "[")), nil, renderer))
 	}
-	for _, ident := range roomID {
+	content := event.MessageEventContent{
-
+		MsgType: "m.text",
-		if md != "" {
+		Body:    message.Text,
-			_, err = d.bot.SendMessageEvent(id.RoomID(ident), event.NewEventType("m.room.message"), map[string]interface{}{
-				"msgtype":        "m.text",
-				"body":           message.Text,
-				"formatted_body": md,
-				"format":         "org.matrix.custom.html",
-			}, gomatrix.ReqSendEvent{})
-		} else {
-			_, err = d.bot.SendText(id.RoomID(ident), message.Text)
 	}
+	if md != "" {
+		content.FormattedBody = md
+		content.Format = "org.matrix.custom.html"
+	}
+	for _, user := range users {
+		if user.Encrypted {
+			err = d.SendEncrypted(&content, user)
+		} else {
+			_, err = d.bot.SendMessageEvent(id.RoomID(user.RoomID), event.NewEventType("m.room.message"), content, gomatrix.ReqSendEvent{})
+		}
+		if err != nil {
+			return
+		}
+	}
+	return
+}
+
+func (d *MatrixDaemon) SendEncrypted(content *event.MessageEventContent, users ...MatrixUser) (err error) {
+	for _, user := range users {
+		var encrypted *event.EncryptedEventContent
+		encrypted, err = d.olm.EncryptMegolmEvent(id.RoomID(user.RoomID), event.EventMessage, content)
+		if err == crypto.SessionExpired || err == crypto.SessionNotShared || err == crypto.NoGroupSession {
+			err = d.olm.ShareGroupSession(id.RoomID(user.RoomID), []id.UserID{id.UserID(user.UserID)})
+			if err != nil {
+				return
+			}
+			encrypted, err = d.olm.EncryptMegolmEvent(id.RoomID(user.RoomID), event.EventMessage, content)
+		}
+		if err != nil {
+			return
+		}
+		_, err = d.bot.SendMessageEvent(id.RoomID(user.RoomID), event.EventEncrypted, encrypted)
 		if err != nil {
 			return
 		}

storage.go

@@ -16,7 +16,7 @@ import (
 
 type Storage struct {
 	timePattern                                                                                                                                                                                                          string
-	invite_path, emails_path, policy_path, configuration_path, displayprefs_path, ombi_path, profiles_path, customEmails_path, users_path, telegram_path, discord_path, matrix_path, announcements_path string
+	invite_path, emails_path, policy_path, configuration_path, displayprefs_path, ombi_path, profiles_path, customEmails_path, users_path, telegram_path, discord_path, matrix_path, announcements_path, matrix_sql_path string
 	users                                                                                                                                                                                                                map[string]time.Time
 	invites                                                                                                                                                                                                              Invites
 	profiles                                                                                                                                                                                                             map[string]Profile