Hook up registration/login APIs and implement access token generation (#122)

src/github.com/matrix-org/dendrite/clientapi/auth/auth.go

@@ -16,7 +16,9 @@
 package auth
 
 import (
+	"crypto/rand"
 	"database/sql"
+	"encoding/base64"
 	"fmt"
 	"net/http"
 	"strings"
@@ -27,6 +29,17 @@ import (
 	"github.com/matrix-org/util"
 )
 
+// UnknownDeviceID is the default device id if one is not specified.
+// This deviates from Synapse which generates a new device ID if one is not specified.
+// It's preferable to not amass a huge list of valid access tokens for an account,
+// so limiting it to 1 unknown device for now limits the number of valid tokens.
+// Clients should be giving us device IDs.
+var UnknownDeviceID = "unknown-device"
+
+// OWASP recommends at least 128 bits of entropy for tokens: https://www.owasp.org/index.php/Insufficient_Session-ID_Length
+// 32 bytes => 256 bits
+var tokenByteLength = 32
+
 // VerifyAccessToken verifies that an access token was supplied in the given HTTP request
 // and returns the device it corresponds to. Returns resErr (an error response which can be
 // sent to the client) if the token is invalid or there was a problem querying the database.
@@ -56,6 +69,17 @@ func VerifyAccessToken(req *http.Request, deviceDB *devices.Database) (device *a
 	return
 }
 
+// GenerateAccessToken creates a new access token. Returns an error if failed to generate
+// random bytes.
+func GenerateAccessToken() (string, error) {
+	b := make([]byte, tokenByteLength)
+	if _, err := rand.Read(b); err != nil {
+		return "", err
+	}
+	// url-safe no padding
+	return base64.RawURLEncoding.EncodeToString(b), nil
+}
+
 // extractAccessToken from a request, or return an error detailing what went wrong. The
 // error message MUST be human-readable and comprehensible to the client.
 func extractAccessToken(req *http.Request) (string, error) {

src/github.com/matrix-org/dendrite/clientapi/auth/storage/accounts/storage.go

@@ -16,6 +16,7 @@ package accounts
 
 import (
 	"database/sql"
+
 	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
 	"github.com/matrix-org/gomatrixserverlib"
 	"golang.org/x/crypto/bcrypt"
@@ -44,7 +45,7 @@ func NewDatabase(dataSourceName string, serverName gomatrixserverlib.ServerName)
 }
 
 // GetAccountByPassword returns the account associated with the given localpart and password.
-// Returns sql.ErrNoRows if no account exists which matches the given credentials.
+// Returns sql.ErrNoRows if no account exists which matches the given localpart.
 func (d *Database) GetAccountByPassword(localpart, plaintextPassword string) (*authtypes.Account, error) {
 	hash, err := d.accounts.selectPasswordHash(localpart)
 	if err != nil {

src/github.com/matrix-org/dendrite/clientapi/auth/storage/devices/devices_table.go

@@ -86,7 +86,7 @@ func (s *devicesStatements) prepare(db *sql.DB, server gomatrixserverlib.ServerN
 // Returns the device on success.
 func (s *devicesStatements) insertDevice(txn *sql.Tx, id, localpart, accessToken string) (dev *authtypes.Device, err error) {
 	createdTimeMS := time.Now().UnixNano() / 1000000
-	if _, err = s.insertDeviceStmt.Exec(id, localpart, accessToken, createdTimeMS); err == nil {
+	if _, err = txn.Stmt(s.insertDeviceStmt).Exec(id, localpart, accessToken, createdTimeMS); err == nil {
 		dev = &authtypes.Device{
 			ID:          id,
 			UserID:      makeUserID(localpart, s.serverName),

src/github.com/matrix-org/dendrite/clientapi/readers/login.go

@@ -16,12 +16,16 @@ package readers
 
 import (
 	"fmt"
+	"net/http"
+
+	"github.com/matrix-org/dendrite/clientapi/auth"
+	"github.com/matrix-org/dendrite/clientapi/auth/storage/accounts"
+	"github.com/matrix-org/dendrite/clientapi/auth/storage/devices"
 	"github.com/matrix-org/dendrite/clientapi/config"
 	"github.com/matrix-org/dendrite/clientapi/httputil"
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/util"
-	"net/http"
 )
 
 type loginFlows struct {
@@ -52,7 +56,7 @@ func passwordLogin() loginFlows {
 }
 
 // Login implements GET and POST /login
-func Login(req *http.Request, cfg config.ClientAPI) util.JSONResponse {
+func Login(req *http.Request, accountDB *accounts.Database, deviceDB *devices.Database, cfg config.ClientAPI) util.JSONResponse {
 	if req.Method == "GET" { // TODO: support other forms of login other than password, depending on config options
 		return util.JSONResponse{
 			Code: 200,
@@ -70,12 +74,41 @@ func Login(req *http.Request, cfg config.ClientAPI) util.JSONResponse {
 				JSON: jsonerror.BadJSON("'user' must be supplied."),
 			}
 		}
-		// TODO: Check username and password properly
+
+		util.GetLogger(req.Context()).WithField("user", r.User).Info("Processing login request")
+
+		acc, err := accountDB.GetAccountByPassword(r.User, r.Password)
+		if err != nil {
+			// Technically we could tell them if the user does not exist by checking if err == sql.ErrNoRows
+			// but that would leak the existence of the user.
+			return util.JSONResponse{
+				Code: 403,
+				JSON: jsonerror.BadJSON("username or password was incorrect, or the account does not exist"),
+			}
+		}
+
+		token, err := auth.GenerateAccessToken()
+		if err != nil {
+			return util.JSONResponse{
+				Code: 500,
+				JSON: jsonerror.Unknown("Failed to generate access token"),
+			}
+		}
+
+		// TODO: Use the device ID in the request
+		dev, err := deviceDB.CreateDevice(acc.Localpart, auth.UnknownDeviceID, token)
+		if err != nil {
+			return util.JSONResponse{
+				Code: 500,
+				JSON: jsonerror.Unknown("failed to create device: " + err.Error()),
+			}
+		}
+
 		return util.JSONResponse{
 			Code: 200,
 			JSON: loginResponse{
-				UserID:      makeUserID(r.User, cfg.ServerName),
-				AccessToken: makeUserID(r.User, cfg.ServerName), // FIXME: token is the user ID for now
+				UserID:      dev.UserID,
+				AccessToken: dev.AccessToken,
 				HomeServer:  cfg.ServerName,
 			},
 		}

src/github.com/matrix-org/dendrite/clientapi/routing/routing.go

@@ -82,14 +82,14 @@ func Setup(
 	)
 
 	r0mux.Handle("/register", common.MakeAPI("register", func(req *http.Request) util.JSONResponse {
-		return writers.Register(req, accountDB)
+		return writers.Register(req, accountDB, deviceDB)
 	}))
 
 	// Stub endpoints required by Riot
 
 	r0mux.Handle("/login",
 		common.MakeAPI("login", func(req *http.Request) util.JSONResponse {
-			return readers.Login(req, cfg)
+			return readers.Login(req, accountDB, deviceDB, cfg)
 		}),
 	)
 

src/github.com/matrix-org/dendrite/clientapi/writers/register.go

@@ -5,8 +5,10 @@ import (
 	"net/http"
 
 	log "github.com/Sirupsen/logrus"
+	"github.com/matrix-org/dendrite/clientapi/auth"
 	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
 	"github.com/matrix-org/dendrite/clientapi/auth/storage/accounts"
+	"github.com/matrix-org/dendrite/clientapi/auth/storage/devices"
 	"github.com/matrix-org/dendrite/clientapi/httputil"
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
 	"github.com/matrix-org/gomatrixserverlib"
@@ -90,7 +92,7 @@ func (r *registerRequest) Validate() *util.JSONResponse {
 }
 
 // Register processes a /register request. http://matrix.org/speculator/spec/HEAD/client_server/unstable.html#post-matrix-client-unstable-register
-func Register(req *http.Request, accountDB *accounts.Database) util.JSONResponse {
+func Register(req *http.Request, accountDB *accounts.Database, deviceDB *devices.Database) util.JSONResponse {
 	var r registerRequest
 	resErr := httputil.UnmarshalJSONRequest(req, &r)
 	if resErr != nil {
@@ -131,7 +133,7 @@ func Register(req *http.Request, accountDB *accounts.Database) util.JSONResponse
 	switch r.Auth.Type {
 	case authtypes.LoginTypeDummy:
 		// there is nothing to do
-		return completeRegistration(accountDB, r.Username, r.Password)
+		return completeRegistration(accountDB, deviceDB, r.Username, r.Password)
 	default:
 		return util.JSONResponse{
 			Code: 501,
@@ -140,7 +142,20 @@ func Register(req *http.Request, accountDB *accounts.Database) util.JSONResponse
 	}
 }
 
-func completeRegistration(accountDB *accounts.Database, username, password string) util.JSONResponse {
+func completeRegistration(accountDB *accounts.Database, deviceDB *devices.Database, username, password string) util.JSONResponse {
+	if username == "" {
+		return util.JSONResponse{
+			Code: 400,
+			JSON: jsonerror.BadJSON("missing username"),
+		}
+	}
+	if password == "" {
+		return util.JSONResponse{
+			Code: 400,
+			JSON: jsonerror.BadJSON("missing password"),
+		}
+	}
+
 	acc, err := accountDB.CreateAccount(username, password)
 	if err != nil {
 		return util.JSONResponse{
@@ -148,15 +163,31 @@ func completeRegistration(accountDB *accounts.Database, username, password strin
 			JSON: jsonerror.Unknown("failed to create account: " + err.Error()),
 		}
 	}
-	// TODO: Make and store a proper access_token
-	// TODO: Store the client's device information?
+
+	token, err := auth.GenerateAccessToken()
+	if err != nil {
+		return util.JSONResponse{
+			Code: 500,
+			JSON: jsonerror.Unknown("Failed to generate access token"),
+		}
+	}
+
+	// // TODO: Use the device ID in the request.
+	dev, err := deviceDB.CreateDevice(username, auth.UnknownDeviceID, token)
+	if err != nil {
+		return util.JSONResponse{
+			Code: 500,
+			JSON: jsonerror.Unknown("failed to create device: " + err.Error()),
+		}
+	}
+
 	return util.JSONResponse{
 		Code: 200,
 		JSON: registerResponse{
-			UserID:      acc.UserID,
-			AccessToken: acc.UserID, // FIXME
+			UserID:      dev.UserID,
+			AccessToken: dev.AccessToken,
 			HomeServer:  acc.ServerName,
-			DeviceID:    "kindauniquedeviceid",
+			DeviceID:    dev.ID,
 		},
 	}
 }