// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

syntax = "proto2";

package securegcm;

option optimize_for = LITE_RUNTIME;
option java_package = "com.google.security.cryptauth.lib.securegcm";
option java_outer_classname = "SecureGcmProto";
option objc_class_prefix = "SGCM";

// Message used only during enrollment
// Field numbers should be kept in sync with DeviceInfo in:
//   java/com/google/security/cryptauth/backend/services/common/common.proto
message GcmDeviceInfo {
  // This field's name does not match the one in DeviceInfo for legacy reasons.
  // Consider using long_device_id and device_type instead when enrolling
  // non-android devices.
  optional fixed64 android_device_id = 1;

  // Used for device_address of DeviceInfo field 2, but for GCM capable devices.
  optional bytes gcm_registration_id = 102;

  // Used for device_address of DeviceInfo field 2, but for iOS devices.
  optional bytes apn_registration_id = 202;

  // Does the user have notifications enabled for the given device address.
  optional bool notification_enabled = 203 [default = true];

  // Used for device_address of DeviceInfo field 2, a Bluetooth Mac address for
  // the device (e.g., to be used with EasyUnlock)
  optional string bluetooth_mac_address = 302;

  // SHA-256 hash of the device master key (from the key exchange).
  // Differs from DeviceInfo field 3, which contains the actual master key.
  optional bytes device_master_key_hash = 103;

  // A SecureMessage.EcP256PublicKey
  required bytes user_public_key = 4;

  // device's model name
  // (e.g., an android.os.Build.MODEL or UIDevice.model)
  optional string device_model = 7;

  // device's locale
  optional string locale = 8;

  // The handle for user_public_key (and implicitly, a master key)
  optional bytes key_handle = 9;

  // The initial counter value for the device, sent by the device
  optional int64 counter = 12 [default = 0];

  // The Operating System version on the device
  // (e.g., an android.os.Build.DISPLAY or UIDevice.systemVersion)
  optional string device_os_version = 13;

  // The Operating System version number on the device
  // (e.g., an android.os.Build.VERSION.SDK_INT)
  optional int64 device_os_version_code = 14;

  // The Operating System release on the device
  // (e.g., an android.os.Build.VERSION.RELEASE)
  optional string device_os_release = 15;

  // The Operating System codename on the device
  // (e.g., an android.os.Build.VERSION.CODENAME or UIDevice.systemName)
  optional string device_os_codename = 16;

  // The software version running on the device
  // (e.g., Authenticator app version string)
  optional string device_software_version = 17;

  // The software version number running on the device
  // (e.g., Authenticator app version code)
  optional int64 device_software_version_code = 18;

  // Software package information if applicable
  // (e.g., com.google.android.apps.authenticator2)
  optional string device_software_package = 19;

  // Size of the display in thousandths of an inch (e.g., 7000 mils = 7 in)
  optional int32 device_display_diagonal_mils = 22;

  // For Authzen capable devices, their Authzen protocol version
  optional int32 device_authzen_version = 24;

  // Not all devices have device identifiers that fit in 64 bits.
  optional bytes long_device_id = 29;

  // The device manufacturer name
  // (e.g., android.os.Build.MANUFACTURER)
  optional string device_manufacturer = 31;

  // Used to indicate which type of device this is.
  optional DeviceType device_type = 32 [default = ANDROID];

  // Fields corresponding to screenlock type/features and hardware features
  // should be numbered in the 400 range.

  // Is this device using  a secure screenlock (e.g., pattern or pin unlock)
  optional bool using_secure_screenlock = 400 [default = false];

  // Is auto-unlocking the screenlock (e.g., when at "home") supported?
  optional bool auto_unlock_screenlock_supported = 401 [default = false];

  // Is auto-unlocking the screenlock (e.g., when at "home") enabled?
  optional bool auto_unlock_screenlock_enabled = 402 [default = false];

  // Does the device have a Bluetooth (classic) radio?
  optional bool bluetooth_radio_supported = 403 [default = false];

  // Is the Bluetooth (classic) radio on?
  optional bool bluetooth_radio_enabled = 404 [default = false];

  // Does the device hardware support a mobile data connection?
  optional bool mobile_data_supported = 405 [default = false];

  // Does the device support tethering?
  optional bool tethering_supported = 406 [default = false];

  // Does the device have a BLE radio?
  optional bool ble_radio_supported = 407 [default = false];

  // Is the device a "Pixel Experience" Android device?
  optional bool pixel_experience = 408 [default = false];

  // Is the device running in the ARC++ container on a chromebook?
  optional bool arc_plus_plus = 409 [default = false];

  // Is the value set in |using_secure_screenlock| reliable? On some Android
  // devices, the platform API to get the screenlock state is not trustworthy.
  // See b/32212161.
  optional bool is_screenlock_state_flaky = 410 [default = false];

  // A list of multi-device software features supported by the device.
  repeated SoftwareFeature supported_software_features = 411;

  // A list of multi-device software features currently enabled (active) on the
  // device.
  repeated SoftwareFeature enabled_software_features = 412;

  // The enrollment session id this is sent with
  optional bytes enrollment_session_id = 1000;

  // A copy of the user's OAuth token
  optional string oauth_token = 1001;
}

// This enum is used by iOS devices as values for device_display_diagonal_mils
// in GcmDeviceInfo. There is no good way to calculate it on those devices.
enum AppleDeviceDiagonalMils {
  // This is the mils diagonal on an iPhone 5.
  APPLE_PHONE = 4000;
  // This is the mils diagonal on an iPad mini.
  APPLE_PAD = 7900;
}

// This should be kept in sync with DeviceType in:
// java/com/google/security/cryptauth/backend/services/common/common_enums.proto
enum DeviceType {
  UNKNOWN = 0;
  ANDROID = 1;
  CHROME = 2;
  IOS = 3;
  BROWSER = 4;
  OSX = 5;
}

// MultiDevice features which may be supported and enabled on a device. See
enum SoftwareFeature {
  UNKNOWN_FEATURE = 0;
  BETTER_TOGETHER_HOST = 1;
  BETTER_TOGETHER_CLIENT = 2;
  EASY_UNLOCK_HOST = 3;
  EASY_UNLOCK_CLIENT = 4;
  MAGIC_TETHER_HOST = 5;
  MAGIC_TETHER_CLIENT = 6;
  SMS_CONNECT_HOST = 7;
  SMS_CONNECT_CLIENT = 8;
}

// A list of "reasons" that can be provided for calling server-side APIs.
// This is particularly important for calls that can be triggered by different
// kinds of events. Please try to keep reasons as generic as possible, so that
// codes can be re-used by various callers in a sensible fashion.
enum InvocationReason {
  REASON_UNKNOWN = 0;
  // First run of the software package invoking this call
  REASON_INITIALIZATION = 1;
  // Ordinary periodic actions (e.g. monthly master key rotation)
  REASON_PERIODIC = 2;
  // Slow-cycle periodic action (e.g. yearly keypair rotation???)
  REASON_SLOW_PERIODIC = 3;
  // Fast-cycle periodic action (e.g. daily sync for Smart Lock users)
  REASON_FAST_PERIODIC = 4;
  // Expired state (e.g. expired credentials, or cached entries) was detected
  REASON_EXPIRATION = 5;
  // An unexpected protocol failure occurred (so attempting to repair state)
  REASON_FAILURE_RECOVERY = 6;
  // A new account has been added to the device
  REASON_NEW_ACCOUNT = 7;
  // An existing account on the device has been changed
  REASON_CHANGED_ACCOUNT = 8;
  // The user toggled the state of a feature (e.g. Smart Lock enabled via BT)
  REASON_FEATURE_TOGGLED = 9;
  // A "push" from the server caused this action (e.g. a sync tickle)
  REASON_SERVER_INITIATED = 10;
  // A local address change triggered this (e.g. GCM registration id changed)
  REASON_ADDRESS_CHANGE = 11;
  // A software update has triggered this
  REASON_SOFTWARE_UPDATE = 12;
  // A manual action by the user triggered this (e.g. commands sent via adb)
  REASON_MANUAL = 13;
  // A custom key has been invalidated on the device (e.g. screen lock is
  // disabled).
  REASON_CUSTOM_KEY_INVALIDATION = 14;
  // Periodic action triggered by auth_proximity
  REASON_PROXIMITY_PERIODIC = 15;
}

enum Type {
  ENROLLMENT = 0;
  TICKLE = 1;
  TX_REQUEST = 2;
  TX_REPLY = 3;
  TX_SYNC_REQUEST = 4;
  TX_SYNC_RESPONSE = 5;
  TX_PING = 6;
  DEVICE_INFO_UPDATE = 7;
  TX_CANCEL_REQUEST = 8;

  // DEPRECATED (can be re-used after Aug 2015)
  PROXIMITYAUTH_PAIRING = 10;

  // The kind of identity assertion generated by a "GCM V1" device (i.e.,
  // an Android phone that has registered with us a public and a symmetric
  // key)
  GCMV1_IDENTITY_ASSERTION = 11;

  // Device-to-device communications are protected by an unauthenticated
  // Diffie-Hellman exchange. The InitiatorHello message is simply the
  // initiator's public DH key, and is not encoded as a SecureMessage, so
  // it doesn't have a tag.
  // The ResponderHello message (which is sent by the responder
  // to the initiator), on the other hand, carries a payload that is protected
  // by the derived shared key. It also contains the responder's
  // public DH key. ResponderHelloAndPayload messages have the
  // DEVICE_TO_DEVICE_RESPONDER_HELLO tag.
  DEVICE_TO_DEVICE_RESPONDER_HELLO_PAYLOAD = 12;

  // Device-to-device communications are protected by an unauthenticated
  // Diffie-Hellman exchange. Once the initiator and responder
  // agree on a shared key (through Diffie-Hellman), they will use messages
  // tagged with DEVICE_TO_DEVICE_MESSAGE to exchange data.
  DEVICE_TO_DEVICE_MESSAGE = 13;

  // Notification to let a device know it should contact a nearby device.
  DEVICE_PROXIMITY_CALLBACK = 14;

  // Device-to-device communications are protected by an unauthenticated
  // Diffie-Hellman exchange. During device-to-device authentication, the first
  // message from initiator (the challenge) is signed and put into the payload
  // of the message sent back to the initiator.
  UNLOCK_KEY_SIGNED_CHALLENGE = 15;

  // Specialty (corp only) features
  LOGIN_NOTIFICATION = 101;
}

message GcmMetadata {
  required Type type = 1;
  optional int32 version = 2 [default = 0];
}

message Tickle {
  // Time after which this tickle should expire
  optional fixed64 expiry_time = 1;
}

message LoginNotificationInfo {
  // Time at which the server received the login notification request.
  optional fixed64 creation_time = 2;

  // Must correspond to user_id in LoginNotificationRequest, if set.
  optional string email = 3;

  // Host where the user's credentials were used to login, if meaningful.
  optional string host = 4;

  // Location from where the user's credentials were used, if meaningful.
  optional string source = 5;

  // Type of login, e.g. ssh, gnome-screensaver, or web.
  optional string event_type = 6;
}