Add FIDO PIN management.

lib/desktop/fido/state.dart

@@ -2,6 +2,7 @@ import 'dart:convert';
 
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:logging/logging.dart';
+import 'package:yubico_authenticator/desktop/models.dart';
 
 import '../../app/models.dart';
 import '../../fido/models.dart';
@@ -49,19 +50,30 @@ class _DesktopFidoStateNotifier extends FidoStateNotifier {
   }
 
   @override
-  Future<void> reset() {
+  Future<void> reset() async {
     // TODO: implement reset
     throw UnimplementedError();
   }
 
   @override
-  Future<void> setPin(String newPin, {String? oldPin}) {
+  Future<PinResult> setPin(String newPin, {String? oldPin}) async {
-    // TODO: implement setPin
+    try {
-    throw UnimplementedError();
+      await _session.command('set_pin', params: {
+        'pin': oldPin,
+        'new_pin': newPin,
+      });
+      return PinResult.success();
+    } on RpcError catch (e) {
+      if (e.status == 'pin-validation') {
+        return PinResult.failed(e.body['retries'], e.body['auth_blocked']);
+      }
+      rethrow;
+    }
+    // TODO: Update state
   }
 
   @override
-  Future<void> unlock(String pin) {
+  Future<PinResult> unlock(String pin) {
     // TODO: implement unlock
     throw UnimplementedError();
   }

lib/fido/models.dart

@@ -16,4 +16,18 @@ class FidoState with _$FidoState {
       _$FidoStateFromJson(json);
 
   bool get hasPin => info['options']['clientPin'] == true;
+
+  int get minPinLength => info['min_pin_length'] as int;
+
+  bool get credMgmt =>
+      info['options']['credMgmt'] == true ||
+      info['options']['credentialMgmtPreview'] == true;
+
+  bool? get bioEnroll => info['options']['bioEnroll'];
+}
+
+@freezed
+class PinResult with _$PinResult {
+  factory PinResult.success() = _Success;
+  factory PinResult.failed(int retries, bool authBlocked) = _Failure;
 }

lib/fido/models.freezed.dart

@@ -178,3 +178,324 @@ abstract class _FidoState extends FidoState {
   _$FidoStateCopyWith<_FidoState> get copyWith =>
       throw _privateConstructorUsedError;
 }
+
+/// @nodoc
+class _$PinResultTearOff {
+  const _$PinResultTearOff();
+
+  _Success success() {
+    return _Success();
+  }
+
+  _Failure failed(int retries, bool authBlocked) {
+    return _Failure(
+      retries,
+      authBlocked,
+    );
+  }
+}
+
+/// @nodoc
+const $PinResult = _$PinResultTearOff();
+
+/// @nodoc
+mixin _$PinResult {
+  @optionalTypeArgs
+  TResult when<TResult extends Object?>({
+    required TResult Function() success,
+    required TResult Function(int retries, bool authBlocked) failed,
+  }) =>
+      throw _privateConstructorUsedError;
+  @optionalTypeArgs
+  TResult? whenOrNull<TResult extends Object?>({
+    TResult Function()? success,
+    TResult Function(int retries, bool authBlocked)? failed,
+  }) =>
+      throw _privateConstructorUsedError;
+  @optionalTypeArgs
+  TResult maybeWhen<TResult extends Object?>({
+    TResult Function()? success,
+    TResult Function(int retries, bool authBlocked)? failed,
+    required TResult orElse(),
+  }) =>
+      throw _privateConstructorUsedError;
+  @optionalTypeArgs
+  TResult map<TResult extends Object?>({
+    required TResult Function(_Success value) success,
+    required TResult Function(_Failure value) failed,
+  }) =>
+      throw _privateConstructorUsedError;
+  @optionalTypeArgs
+  TResult? mapOrNull<TResult extends Object?>({
+    TResult Function(_Success value)? success,
+    TResult Function(_Failure value)? failed,
+  }) =>
+      throw _privateConstructorUsedError;
+  @optionalTypeArgs
+  TResult maybeMap<TResult extends Object?>({
+    TResult Function(_Success value)? success,
+    TResult Function(_Failure value)? failed,
+    required TResult orElse(),
+  }) =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $PinResultCopyWith<$Res> {
+  factory $PinResultCopyWith(PinResult value, $Res Function(PinResult) then) =
+      _$PinResultCopyWithImpl<$Res>;
+}
+
+/// @nodoc
+class _$PinResultCopyWithImpl<$Res> implements $PinResultCopyWith<$Res> {
+  _$PinResultCopyWithImpl(this._value, this._then);
+
+  final PinResult _value;
+  // ignore: unused_field
+  final $Res Function(PinResult) _then;
+}
+
+/// @nodoc
+abstract class _$SuccessCopyWith<$Res> {
+  factory _$SuccessCopyWith(_Success value, $Res Function(_Success) then) =
+      __$SuccessCopyWithImpl<$Res>;
+}
+
+/// @nodoc
+class __$SuccessCopyWithImpl<$Res> extends _$PinResultCopyWithImpl<$Res>
+    implements _$SuccessCopyWith<$Res> {
+  __$SuccessCopyWithImpl(_Success _value, $Res Function(_Success) _then)
+      : super(_value, (v) => _then(v as _Success));
+
+  @override
+  _Success get _value => super._value as _Success;
+}
+
+/// @nodoc
+
+class _$_Success implements _Success {
+  _$_Success();
+
+  @override
+  String toString() {
+    return 'PinResult.success()';
+  }
+
+  @override
+  bool operator ==(dynamic other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType && other is _Success);
+  }
+
+  @override
+  int get hashCode => runtimeType.hashCode;
+
+  @override
+  @optionalTypeArgs
+  TResult when<TResult extends Object?>({
+    required TResult Function() success,
+    required TResult Function(int retries, bool authBlocked) failed,
+  }) {
+    return success();
+  }
+
+  @override
+  @optionalTypeArgs
+  TResult? whenOrNull<TResult extends Object?>({
+    TResult Function()? success,
+    TResult Function(int retries, bool authBlocked)? failed,
+  }) {
+    return success?.call();
+  }
+
+  @override
+  @optionalTypeArgs
+  TResult maybeWhen<TResult extends Object?>({
+    TResult Function()? success,
+    TResult Function(int retries, bool authBlocked)? failed,
+    required TResult orElse(),
+  }) {
+    if (success != null) {
+      return success();
+    }
+    return orElse();
+  }
+
+  @override
+  @optionalTypeArgs
+  TResult map<TResult extends Object?>({
+    required TResult Function(_Success value) success,
+    required TResult Function(_Failure value) failed,
+  }) {
+    return success(this);
+  }
+
+  @override
+  @optionalTypeArgs
+  TResult? mapOrNull<TResult extends Object?>({
+    TResult Function(_Success value)? success,
+    TResult Function(_Failure value)? failed,
+  }) {
+    return success?.call(this);
+  }
+
+  @override
+  @optionalTypeArgs
+  TResult maybeMap<TResult extends Object?>({
+    TResult Function(_Success value)? success,
+    TResult Function(_Failure value)? failed,
+    required TResult orElse(),
+  }) {
+    if (success != null) {
+      return success(this);
+    }
+    return orElse();
+  }
+}
+
+abstract class _Success implements PinResult {
+  factory _Success() = _$_Success;
+}
+
+/// @nodoc
+abstract class _$FailureCopyWith<$Res> {
+  factory _$FailureCopyWith(_Failure value, $Res Function(_Failure) then) =
+      __$FailureCopyWithImpl<$Res>;
+  $Res call({int retries, bool authBlocked});
+}
+
+/// @nodoc
+class __$FailureCopyWithImpl<$Res> extends _$PinResultCopyWithImpl<$Res>
+    implements _$FailureCopyWith<$Res> {
+  __$FailureCopyWithImpl(_Failure _value, $Res Function(_Failure) _then)
+      : super(_value, (v) => _then(v as _Failure));
+
+  @override
+  _Failure get _value => super._value as _Failure;
+
+  @override
+  $Res call({
+    Object? retries = freezed,
+    Object? authBlocked = freezed,
+  }) {
+    return _then(_Failure(
+      retries == freezed
+          ? _value.retries
+          : retries // ignore: cast_nullable_to_non_nullable
+              as int,
+      authBlocked == freezed
+          ? _value.authBlocked
+          : authBlocked // ignore: cast_nullable_to_non_nullable
+              as bool,
+    ));
+  }
+}
+
+/// @nodoc
+
+class _$_Failure implements _Failure {
+  _$_Failure(this.retries, this.authBlocked);
+
+  @override
+  final int retries;
+  @override
+  final bool authBlocked;
+
+  @override
+  String toString() {
+    return 'PinResult.failed(retries: $retries, authBlocked: $authBlocked)';
+  }
+
+  @override
+  bool operator ==(dynamic other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _Failure &&
+            const DeepCollectionEquality().equals(other.retries, retries) &&
+            const DeepCollectionEquality()
+                .equals(other.authBlocked, authBlocked));
+  }
+
+  @override
+  int get hashCode => Object.hash(
+      runtimeType,
+      const DeepCollectionEquality().hash(retries),
+      const DeepCollectionEquality().hash(authBlocked));
+
+  @JsonKey(ignore: true)
+  @override
+  _$FailureCopyWith<_Failure> get copyWith =>
+      __$FailureCopyWithImpl<_Failure>(this, _$identity);
+
+  @override
+  @optionalTypeArgs
+  TResult when<TResult extends Object?>({
+    required TResult Function() success,
+    required TResult Function(int retries, bool authBlocked) failed,
+  }) {
+    return failed(retries, authBlocked);
+  }
+
+  @override
+  @optionalTypeArgs
+  TResult? whenOrNull<TResult extends Object?>({
+    TResult Function()? success,
+    TResult Function(int retries, bool authBlocked)? failed,
+  }) {
+    return failed?.call(retries, authBlocked);
+  }
+
+  @override
+  @optionalTypeArgs
+  TResult maybeWhen<TResult extends Object?>({
+    TResult Function()? success,
+    TResult Function(int retries, bool authBlocked)? failed,
+    required TResult orElse(),
+  }) {
+    if (failed != null) {
+      return failed(retries, authBlocked);
+    }
+    return orElse();
+  }
+
+  @override
+  @optionalTypeArgs
+  TResult map<TResult extends Object?>({
+    required TResult Function(_Success value) success,
+    required TResult Function(_Failure value) failed,
+  }) {
+    return failed(this);
+  }
+
+  @override
+  @optionalTypeArgs
+  TResult? mapOrNull<TResult extends Object?>({
+    TResult Function(_Success value)? success,
+    TResult Function(_Failure value)? failed,
+  }) {
+    return failed?.call(this);
+  }
+
+  @override
+  @optionalTypeArgs
+  TResult maybeMap<TResult extends Object?>({
+    TResult Function(_Success value)? success,
+    TResult Function(_Failure value)? failed,
+    required TResult orElse(),
+  }) {
+    if (failed != null) {
+      return failed(this);
+    }
+    return orElse();
+  }
+}
+
+abstract class _Failure implements PinResult {
+  factory _Failure(int retries, bool authBlocked) = _$_Failure;
+
+  int get retries;
+  bool get authBlocked;
+  @JsonKey(ignore: true)
+  _$FailureCopyWith<_Failure> get copyWith =>
+      throw _privateConstructorUsedError;
+}

lib/fido/state.dart

@@ -11,6 +11,6 @@ final fidoStateProvider = StateNotifierProvider.autoDispose
 
 abstract class FidoStateNotifier extends ApplicationStateNotifier<FidoState> {
   Future<void> reset();
-  Future<void> unlock(String pin);
+  Future<PinResult> unlock(String pin);
-  Future<void> setPin(String newPin, {String? oldPin});
+  Future<PinResult> setPin(String newPin, {String? oldPin});
 }

lib/fido/views/fido_screen.dart

@@ -3,6 +3,8 @@ import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:yubico_authenticator/desktop/state.dart';
+import 'package:yubico_authenticator/fido/views/pin_dialog.dart';
+import 'package:yubico_authenticator/management/models.dart';
 
 import '../../app/models.dart';
 import '../../app/views/app_failure_screen.dart';
@@ -18,6 +20,14 @@ class FidoScreen extends ConsumerWidget {
       ref.watch(fidoStateProvider(deviceData.node.path)).when(
           none: () => const AppLoadingScreen(),
           failure: (reason) {
+            final fido2 = deviceData.info
+                        .supportedCapabilities[deviceData.node.transport]! &
+                    Capability.fido2.value !=
+                0;
+            if (!fido2) {
+              return const AppFailureScreen(
+                  'WebAuthn is supported by this device, but there are no management options available.');
+            }
             if (Platform.isWindows) {
               if (!ref
                   .watch(rpcStateProvider.select((state) => state.isAdmin))) {
@@ -25,11 +35,54 @@ class FidoScreen extends ConsumerWidget {
                     'WebAuthn management requires elevated privileges.\nRestart this app as administrator.');
               }
             }
+            if (deviceData.info
+                        .supportedCapabilities[deviceData.node.transport]! &
+                    Capability.fido2.value ==
+                0) {}
             return AppFailureScreen(reason);
           },
           success: (state) => ListView(
                 children: [
-                  Text('${state.info}'),
+                  ListTile(
+                    leading: const CircleAvatar(
+                      child: Icon(Icons.pin),
+                    ),
+                    title: const Text('PIN'),
+                    subtitle:
+                        Text(state.hasPin ? 'Change your PIN' : 'Set a PIN'),
+                    onTap: () {
+                      showDialog(
+                        context: context,
+                        builder: (context) =>
+                            FidoPinDialog(deviceData.node.path, state),
+                      );
+                    },
+                  ),
+                  if (state.bioEnroll != null)
+                    ListTile(
+                      leading: const CircleAvatar(
+                        child: Icon(Icons.fingerprint),
+                      ),
+                      title: const Text('Fingerprints'),
+                      subtitle: Text(state.bioEnroll == true
+                          ? 'Fingerprints have been registered'
+                          : 'No fingerprints registered'),
+                    ),
+                  if (state.credMgmt)
+                    const ListTile(
+                      leading: CircleAvatar(
+                        child: Icon(Icons.account_box),
+                      ),
+                      title: Text('Credentials'),
+                      subtitle: Text('Manage stored credentials on key'),
+                    ),
+                  const ListTile(
+                    leading: CircleAvatar(
+                      child: Icon(Icons.delete_forever),
+                    ),
+                    title: Text('Factory reset'),
+                    subtitle: Text('Delete all data and remove PIN'),
+                  ),
                 ],
               ));
 }

lib/fido/views/pin_dialog.dart

@@ -0,0 +1,147 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../../app/models.dart';
+import '../../app/state.dart';
+import '../../app/views/responsive_dialog.dart';
+import '../models.dart';
+import '../state.dart';
+
+class FidoPinDialog extends ConsumerStatefulWidget {
+  final DevicePath devicePath;
+  final FidoState state;
+  const FidoPinDialog(this.devicePath, this.state, {Key? key})
+      : super(key: key);
+
+  @override
+  ConsumerState<ConsumerStatefulWidget> createState() => _FidoPinDialogState();
+}
+
+class _FidoPinDialogState extends ConsumerState<FidoPinDialog> {
+  String _currentPin = '';
+  String _newPin = '';
+  String _confirmPin = '';
+  String? _currentPinError;
+  String? _newPinError;
+
+  @override
+  Widget build(BuildContext context) {
+    // If current device changes, we need to pop back to the main Page.
+    ref.listen<DeviceNode?>(currentDeviceProvider, (previous, next) {
+      Navigator.of(context).pop();
+    });
+
+    final minPinLength = widget.state.minPinLength;
+    final hasPin = widget.state.hasPin;
+
+    return ResponsiveDialog(
+      title: Text(hasPin ? 'Change PIN' : 'Set PIN'),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          if (hasPin) ...[
+            Text(
+              'Current PIN',
+              style: Theme.of(context).textTheme.headline6,
+            ),
+            TextFormField(
+              initialValue: _currentPin,
+              autofocus: true,
+              obscureText: true,
+              decoration: InputDecoration(
+                border: const OutlineInputBorder(),
+                labelText: 'Current PIN',
+                errorText: _currentPinError,
+              ),
+              onChanged: (value) {
+                setState(() {
+                  _currentPin = value;
+                });
+              },
+            ),
+          ],
+          Text(
+            'New PIN',
+            style: Theme.of(context).textTheme.headline6,
+          ),
+          TextFormField(
+            initialValue: _newPin,
+            autofocus: !hasPin,
+            obscureText: true,
+            decoration: InputDecoration(
+              border: const OutlineInputBorder(),
+              labelText: 'New password',
+              enabled: !hasPin || _currentPin.isNotEmpty,
+              errorText: _newPinError,
+            ),
+            onChanged: (value) {
+              setState(() {
+                _newPin = value;
+              });
+            },
+          ),
+          TextFormField(
+            initialValue: _confirmPin,
+            obscureText: true,
+            decoration: InputDecoration(
+              border: const OutlineInputBorder(),
+              labelText: 'Confirm password',
+              enabled: _newPin.isNotEmpty,
+            ),
+            onChanged: (value) {
+              setState(() {
+                _confirmPin = value;
+              });
+            },
+          ),
+        ]
+            .map((e) => Padding(
+                  padding: const EdgeInsets.symmetric(vertical: 8.0),
+                  child: e,
+                ))
+            .toList(),
+      ),
+      actions: [
+        TextButton(
+          child: const Text('Save'),
+          onPressed: _newPin.isNotEmpty &&
+                  _newPin == _confirmPin &&
+                  (!hasPin || _currentPin.isNotEmpty)
+              ? () async {
+                  final oldPin = _currentPin.isNotEmpty ? _currentPin : null;
+                  if (_newPin.length < minPinLength) {
+                    setState(() {
+                      _newPinError =
+                          'New PIN must be at least $minPinLength characters';
+                    });
+                    return;
+                  }
+                  final result = await ref
+                      .read(fidoStateProvider(widget.devicePath).notifier)
+                      .setPin(_newPin, oldPin: oldPin);
+                  result.when(success: () {
+                    Navigator.of(context).pop(true);
+                    ScaffoldMessenger.of(context).showSnackBar(
+                      const SnackBar(
+                        content: Text('PIN set'),
+                        duration: Duration(seconds: 2),
+                      ),
+                    );
+                  }, failed: (retries, authBlocked) {
+                    setState(() {
+                      if (authBlocked) {
+                        _currentPinError =
+                            'PIN has been blocked until the YubiKey is removed and reinserted';
+                      } else {
+                        _currentPinError =
+                            'Wrong PIN ($retries tries remaining)';
+                      }
+                    });
+                  });
+                }
+              : null,
+        ),
+      ],
+    );
+  }
+}

ykman-rpc/rpc/fido.py

@@ -26,7 +26,8 @@
 # POSSIBILITY OF SUCH DAMAGE.
 
 
-from .base import RpcNode, action, child
+from .base import RpcNode, action, child, RpcException
+from fido2.ctap import CtapError
 from fido2.ctap2 import (
     Ctap2,
     ClientPin,
@@ -40,6 +41,15 @@ import logging
 logger = logging.getLogger(__name__)
 
 
+class PinValidationException(RpcException):
+    def __init__(self, retries, auth_blocked):
+        super().__init__(
+            "pin-validation",
+            "Authentication is required",
+            dict(retries=retries, auth_blocked=auth_blocked),
+        )
+
+
 class Ctap2Node(RpcNode):
     def __init__(self, connection):
         super().__init__()
@@ -47,11 +57,14 @@ class Ctap2Node(RpcNode):
         self._info = self.ctap.info
         self.client_pin = ClientPin(self.ctap)
         self._pin = None
+        self._auth_blocked = False
 
     def get_data(self):
         self._info = self.ctap.get_info()
         logger.debug(f"Info: {self._info}")
-        data = dict(info=asdict(self._info), locked=False)
+        data = dict(
+            info=asdict(self._info), locked=False, auth_blocked=self._auth_blocked
+        )
         if self._info.options.get("clientPin"):
             data["locked"] = self._pin is None
             pin_retries, power_cycle = self.client_pin.get_pin_retries()
@@ -70,20 +83,37 @@ class Ctap2Node(RpcNode):
     def reset(self, params, event, signal):
         self.ctap.reset(event)
         self._pin = None
+        self._auth_blocked = False
         return dict()
 
+    def _handle_pin_error(self, e):
+        if e.code in (
+            CtapError.ERR.PIN_INVALID,
+            CtapError.ERR.PIN_BLOCKED,
+            CtapError.ERR.PIN_AUTH_BLOCKED,
+        ):
+            pin_retries, _ = self.client_pin.get_pin_retries()
+            raise PinValidationException(
+                pin_retries, e.code == CtapError.ERR.PIN_AUTH_BLOCKED
+            )
+        raise e
+
     @action(condition=lambda self: self._info.options["clientPin"])
     def verify_pin(self, params, event, signal):
         pin = params.pop("pin")
+        try:
             self.client_pin.get_pin_token(
                 pin, ClientPin.PERMISSION.GET_ASSERTION, "ykman.example.com"
             )
             self._pin = pin
             return dict()
+        except CtapError as e:
+            return self._handle_pin_error(e)
 
     @action
     def set_pin(self, params, event, signal):
         has_pin = self.ctap.get_info().options["clientPin"]
+        try:
             if has_pin:
                 self.client_pin.change_pin(
                     params.pop("pin"),
@@ -95,6 +125,8 @@ class Ctap2Node(RpcNode):
                 )
             self._pin = None
             return dict()
+        except CtapError as e:
+            return self._handle_pin_error(e)
 
     @child(condition=lambda self: "bioEnroll" in self._info.options and self._pin)
     def fingerprints(self):