Add User-Interactive Authentication (#1193)

* Add User-Interactive Authentication

And use it when deleting a device. With tests.

* Make remaining sytest pass

* Linting

* 403 not 401 on wrong user/pass

clientapi/auth/user_interactive_test.go

@@ -0,0 +1,174 @@
+package auth
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"testing"
+
+	"github.com/matrix-org/dendrite/internal/config"
+	"github.com/matrix-org/dendrite/userapi/api"
+	"github.com/matrix-org/gomatrixserverlib"
+	"github.com/matrix-org/util"
+)
+
+var (
+	ctx        = context.Background()
+	serverName = gomatrixserverlib.ServerName("example.com")
+	// space separated localpart+password -> account
+	lookup = make(map[string]*api.Account)
+	device = &api.Device{
+		AccessToken: "flibble",
+		DisplayName: "My Device",
+		ID:          "device_id_goes_here",
+	}
+)
+
+func getAccountByPassword(ctx context.Context, localpart, plaintextPassword string) (*api.Account, error) {
+	acc, ok := lookup[localpart+" "+plaintextPassword]
+	if !ok {
+		return nil, fmt.Errorf("unknown user/password")
+	}
+	return acc, nil
+}
+
+func setup() *UserInteractive {
+	cfg := &config.Dendrite{}
+	cfg.Matrix.ServerName = serverName
+	return NewUserInteractive(getAccountByPassword, cfg)
+}
+
+func TestUserInteractiveChallenge(t *testing.T) {
+	uia := setup()
+	// no auth key results in a challenge
+	_, errRes := uia.Verify(ctx, []byte(`{}`), device)
+	if errRes == nil {
+		t.Fatalf("Verify succeeded with {} but expected failure")
+	}
+	if errRes.Code != 401 {
+		t.Errorf("Expected HTTP 401, got %d", errRes.Code)
+	}
+}
+
+func TestUserInteractivePasswordLogin(t *testing.T) {
+	uia := setup()
+	// valid password login succeeds when an account exists
+	lookup["alice herpassword"] = &api.Account{
+		Localpart:  "alice",
+		ServerName: serverName,
+		UserID:     fmt.Sprintf("@alice:%s", serverName),
+	}
+	// valid password requests
+	testCases := []json.RawMessage{
+		// deprecated form
+		[]byte(`{
+			"auth": {
+				"type": "m.login.password",
+				"user": "alice",
+				"password": "herpassword"
+			}
+		}`),
+		// new form
+		[]byte(`{
+			"auth": {
+				"type": "m.login.password",
+				"identifier": {
+					"type": "m.id.user",
+					"user": "alice"
+				},
+				"password": "herpassword"
+			}
+		}`),
+	}
+	for _, tc := range testCases {
+		_, errRes := uia.Verify(ctx, tc, device)
+		if errRes != nil {
+			t.Errorf("Verify failed but expected success for request: %s - got %+v", string(tc), errRes)
+		}
+	}
+}
+
+func TestUserInteractivePasswordBadLogin(t *testing.T) {
+	uia := setup()
+	// password login fails when an account exists but is specced wrong
+	lookup["bob hispassword"] = &api.Account{
+		Localpart:  "bob",
+		ServerName: serverName,
+		UserID:     fmt.Sprintf("@bob:%s", serverName),
+	}
+	// invalid password requests
+	testCases := []struct {
+		body    json.RawMessage
+		wantRes util.JSONResponse
+	}{
+		{
+			// fields not in an auth dict
+			body: []byte(`{
+				"type": "m.login.password",
+				"user": "bob",
+				"password": "hispassword"
+			}`),
+			wantRes: util.JSONResponse{
+				Code: 401,
+			},
+		},
+		{
+			// wrong type
+			body: []byte(`{
+				"auth": {
+					"type": "m.login.not_password",
+					"identifier": {
+						"type": "m.id.user",
+						"user": "bob"
+					},
+					"password": "hispassword"
+				}
+			}`),
+			wantRes: util.JSONResponse{
+				Code: 400,
+			},
+		},
+		{
+			// identifier type is wrong
+			body: []byte(`{
+				"auth": {
+					"type": "m.login.password",
+					"identifier": {
+						"type": "m.id.thirdparty",
+						"user": "bob"
+					},
+					"password": "hispassword"
+				}
+			}`),
+			wantRes: util.JSONResponse{
+				Code: 401,
+			},
+		},
+		{
+			// wrong password
+			body: []byte(`{
+				"auth": {
+					"type": "m.login.password",
+					"identifier": {
+						"type": "m.id.user",
+						"user": "bob"
+					},
+					"password": "not_his_password"
+				}
+			}`),
+			wantRes: util.JSONResponse{
+				Code: 401,
+			},
+		},
+	}
+	for _, tc := range testCases {
+		_, errRes := uia.Verify(ctx, tc.body, device)
+		if errRes == nil {
+			t.Errorf("Verify succeeded but expected failure for request: %s", string(tc.body))
+			continue
+		}
+		if errRes.Code != tc.wantRes.Code {
+			t.Errorf("got code %d want code %d for request: %s", errRes.Code, tc.wantRes.Code, string(tc.body))
+		}
+	}
+}