// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

syntax = "proto2";

option optimize_for = LITE_RUNTIME;

package enterprise_management;

// Request from device to server to register device.
message DeviceRegisterRequest {
  // Reregister device without erasing server state.  It can be used
  // to refresh dmtoken etc.  Client MUST set this value to true if it
  // reuses an existing device id.
  optional bool reregister = 1;

  // Device register type.  This field does not exist for TT release.
  // When a client requests for policies, server should verify the
  // client has been registered properly.  For example, a client must
  // register with type DEVICE in order to retrieve device policies.
  enum Type {
    TT   = 0;             // Register for TT release.
    USER = 1;             // Register for Chrome OS user polices.
    DEVICE = 2;           // Register for device policies.
    BROWSER = 3;          // Register for Chrome user policies.
    ANDROID_BROWSER = 4;  // Register for Android Chrome browser user policies.
    IOS_BROWSER = 5;      // Register for iOS Chrome browser user policies.
  }
  // NOTE: we also use this field to detect client version.  If this
  // field is missing, then the request comes from TT.  We will remove
  // Chrome OS TT support once it is over.
  optional Type type = 2 [default = TT];

  // Machine hardware id, such as serial number.
  // This field is required if register type == DEVICE.
  optional string machine_id = 3;

  // Machine model name, such as "ZGA", "Cr-48", "Nexus One".  If the
  // model name is not available, client SHOULD send generic name like
  // "Android", or "Chrome OS".
  optional string machine_model = 4;

  // OBSOLETE: Legacy auto-enrollment is not longer supported.
  optional bool OBSOLETE_auto_enrolled = 5 [deprecated = true];

  // Indicates a requisition of the registering entity that the server can act
  // upon. This allows clients to pass hints e.g. at device enrollment time
  // about the intended use of the device.
  optional string requisition = 6;

  // The current server-backed state key for the client, if applicable. This can
  // be used by the server to link the registration request to an existing
  // device record for re-enrollment.
  optional bytes server_backed_state_key = 7;

  // Enumerates different flavors of registration.
  enum Flavor {
    // User manually enrolls a device for device management.
    FLAVOR_ENROLLMENT_MANUAL = 0;
    // User re-starts enrollment manually to recover from loss of policy.
    FLAVOR_ENROLLMENT_MANUAL_RENEW = 1;
    // Device enrollment forced by local device configuration, such as OEM
    // partition flags to force enrollment.
    FLAVOR_ENROLLMENT_LOCAL_FORCED = 2;
    // Enrollment advertised by local device configuration, such as OEM
    // partition flags indicating to prompt for enrollment, but allowing the
    // user to skip.
    FLAVOR_ENROLLMENT_LOCAL_ADVERTISED = 3;
    // Device state downloaded from the server during OOBE indicates that
    // (re-)enrollment is mandatory.
    FLAVOR_ENROLLMENT_SERVER_FORCED = 4;
    // Device state downloaded from the server during OOBE indicates that the
    // device should prompt for (re-)enrollment, but the user is allowed to
    // skip.
    FLAVOR_ENROLLMENT_SERVER_ADVERTISED = 5;
    // Device detected in steady state that it is supposed to be enrolled, but
    // the policy is missing.
    FLAVOR_ENROLLMENT_RECOVERY = 6;
    // User policy registration for a logged-in user.
    FLAVOR_USER_REGISTRATION = 7;
  };

  // Indicates the registration flavor. This is passed to the server FYI when
  // registering for policy so the server can distinguish registration triggers.
  optional Flavor flavor = 8;
}

// Response from server to device register request.
message DeviceRegisterResponse {
  // Device management token for this registration.  This token MUST be
  // part of HTTP Authorization header for all future requests from
  // device to server.
  required string device_management_token = 1;

  // Device display name.  By default, server generates the name in
  // the format of "Machine Model - Machine Id".  However, domain
  // admin can update it using CPanel, so do NOT treat it as constant.
  optional string machine_name = 2;

  // Enum listing the possible modes the device should be locked into when the
  // registration is finished.
  enum DeviceMode {
    // In ENTERPRISE mode the device has no local owner and device settings are
    // controlled through the cloud policy infrastructure. Auto-enrollment is
    // supported in that mode.
    ENTERPRISE = 0;
    // Devices in RETAIL mode also have no local owner and get their device
    // settings from the cloud, but additionally this mode enables the demo
    // account on the device.
    RETAIL = 1;
  }
  optional DeviceMode enrollment_type = 3 [default = ENTERPRISE];
}

// Request from device to server to unregister device.
// GoogleDMToken MUST be in HTTP Authorization header.
message DeviceUnregisterRequest {
}

// Response from server to device for unregister request.
message DeviceUnregisterResponse {
}

// Request from device to server to upload device EMCert
// (enterprise machine cert used for remote attestation).
// GoogleDMToken MUST be in HTTP Authorization header.
message DeviceCertUploadRequest {
  // EMCert in X.509 format.
  optional bytes device_certificate = 1;
}

// Response from server to device for cert upload request.
message DeviceCertUploadResponse {
}

// Request to access a Google service with the given scope.
message DeviceServiceApiAccessRequest {
  // The list of auth scopes the device requests from DMServer.
  repeated string auth_scope = 1;

  // OAuth2 client ID to which the returned authorization code is bound.
  optional string oauth2_client_id = 2;
}

message DeviceServiceApiAccessResponse {
  // The OAuth2 authorization code for the requested scope(s).
  // This can be exchanged for a refresh token.
  optional string auth_code = 1;
}

message PolicyFetchRequest {
  // This is the policy type, which maps to D3 policy type internally.
  // By convention, we use "/" as separator to create policy namespace.
  // The policy type names are case insensitive.
  //
  // Possible values for Chrome OS are:
  //   google/chromeos/device => ChromeDeviceSettingsProto
  //   google/chromeos/user => ChromeSettingsProto
  //   google/chromeos/publicaccount => ChromeSettingsProto
  //   google/chrome/extension => ExternalPolicyData
  //   google/android/user => ChromeSettingsProto
  //   google/ios/user => ChromeSettingsProto
  optional string policy_type = 1;

  // This is the last policy timestamp that client received from server.
  optional int64 timestamp = 2;

  // Tell server what kind of security signature is required.
  enum SignatureType {
    NONE = 0;
    SHA1_RSA = 1;
  }
  optional SignatureType signature_type = 3 [default = NONE];

  // The version number of the public key that is currently stored
  // on the client. This should be the last number the server had
  // supplied as new_public_key_version in PolicyData.
  // This field is unspecified if the client does not yet have a
  // public key.
  optional int32 public_key_version = 4;

  // Machine hardware id, such as serial number.
  // This field is should be set only if the serial number for the device is
  // missing from the server, as indicated by the valid_serial_number_missing
  // field in the last policy fetch response.
  optional string machine_id = 5;

  // This field is used for devices to send the additional ID to fetch settings.
  // Retrieving some settings requires more than just device or user ID.
  // For example, to retrieve public account, devices need to pass in
  // public account ID in addition to device ID. To retrieve extension or
  // plug-in settings, devices need to pass in extension/plug-in ID in
  // addition to user ID.
  // policy_type represents the type of settings (e.g. public account,
  // extension) devices request to fetch.
  optional string settings_entity_id = 6;

  // If this fetch is due to a policy invalidation, this field contains the
  // version provided with the invalidation. The server interprets this value
  // and the value of invalidation_payload to fetch the up-to-date policy.
  optional int64 invalidation_version = 7;

  // If this fetch is due to a policy invalidation, this field contains the
  // payload delivered with the invalidation. The server interprets this value
  // and the value of invalidation_version to fetch the up-to-date policy.
  optional bytes invalidation_payload = 8;

  // Hash string for the chrome policy verification public key which is embedded
  // into Chrome binary. Matching private key will be used by the server
  // to sign per-domain policy keys during key rotation. If server does not
  // have the key which matches this hash string, that could indicate malicious
  // or out-of-date Chrome client.
  optional string verification_key_hash = 9;
}

// This message customizes how the device behaves when it is disabled by its
// owner. The message will be sent as part of the DeviceState fetched during
// normal operation and as part of the DeviceStateRetrievalResponse fetched when
// the device is wiped/reinstalled.
message DisabledState {
  // A message to the finder/thief that should be shown on the screen.
  optional string message = 1;
}

message DeviceState {
  // Modes of operation that the device can be in.
  enum DeviceMode {
    // The device is operating normally. Sessions can be started and the device
    // can be used.
    DEVICE_MODE_NORMAL = 0;
    // The device has been disabled by its owner. The device will show a warning
    // screen and will not allow any sessions to be started.
    DEVICE_MODE_DISABLED = 1;
  }
  // The mode of operation that the device should be in.
  optional DeviceMode device_mode = 1 [default = DEVICE_MODE_NORMAL];

  // State that is relevant only when the |device_mode| is
  // |DEVICE_MODE_DISABLED|.
  optional DisabledState disabled_state = 2;
}

// This message is included in serialized form in PolicyFetchResponse
// below.  It may also be signed, with the signature being created for
// the serialized form.
message PolicyData {
  // See PolicyFetchRequest.policy_type.
  optional string policy_type = 1;

  // [timestamp] is milliseconds since Epoch in UTC timezone. It is
  // included here so that the time at which the server issued this
  // response cannot be faked (as protection against replay attacks).
  // It is the timestamp generated by DMServer, NOT the time admin
  // last updated the policy or anything like that.
  optional int64 timestamp = 2;

  // The DM token that was used by the client in the HTTP POST header
  // for authenticating the request. It is included here again so that
  // the client can verify that the response is meant for him (and not
  // issued by a replay or man-in-the-middle attack).
  optional string request_token = 3;

  // The serialized value of the actual policy protobuf.  This can be
  // deserialized to an instance of, for example, ChromeSettingsProto,
  // ChromeDeviceSettingsProto, or ExternalPolicyData.
  optional bytes policy_value = 4;

  // The device display name assigned by the server.  It is only
  // filled if the display name is available.
  //
  // The display name of the machine as generated by the server or set
  // by the Administrator in the CPanel GUI. This is the same thing as
  // |machine_name| in DeviceRegisterResponse but it might have
  // changed since then.
  optional string machine_name = 5;

  // Version number of the server's current public key. (The key that
  // was used to sign this response. Numbering should start at 1 and be
  // increased by 1 at each key rotation.)
  optional int32 public_key_version = 6;

  // The user this policy is intended for. In case of device policy, the name
  // of the owner (who registered the device).
  optional string username = 7;

  // In this field the DMServer should echo back the "deviceid" HTTP parameter
  // from the request.
  optional string device_id = 8;

  // Indicates which state this association with DMServer is in. This can be
  // used to tell the client that it is not receiving policy even though the
  // registration with the server is kept active.
  enum AssociationState {
    // Association is active and policy is pushed.
    ACTIVE = 0;
    // Association is alive, but the corresponding domain is not managed.
    UNMANAGED = 1;
    // Client got dropped on the server side.
    DEPROVISIONED = 2;
  }
  optional AssociationState state = 9 [default = ACTIVE];

  // Indicates if the the server cannot find a valid serial number for the
  // device.  If this flag is set, the device should send the valid serial
  // number with a device policy fetch request.  Note that this only
  // applies to device policy.
  optional bool valid_serial_number_missing = 10;

  // Indicates which public account or extension/plug-in this policy data is
  // for. See PolicyFetchRequest.settings_entity_id for more details.
  optional string settings_entity_id = 11;

  // Indicates the identity the device service account is associated with.
  // This is only sent as part of device policy fetch.
  optional string service_account_identity = 12;

  // The object source which hosts policy objects within the invalidation
  // service. This value is combined with invalidation_name to form the object
  // id used to register for invalidations to this policy.
  optional int32 invalidation_source = 13;

  // The name which uniquely identifies this policy within the invalidation
  // service object source. This value is combined with invalidation_source to
  // form the object id used to register for invalidations to this policy.
  optional bytes invalidation_name = 14;

  // Server-provided identifier of the fetched policy. This is to be used
  // by the client when requesting Policy Posture assertion through an API
  // call or SAML flow.
  optional string policy_token = 15;

  // Indicates the management mode of the device. Note that old policies do not
  // have this field. If this field is not set but request_token is set, assume
  // the management mode is ENTERPRISE_MANAGED. If both this field and
  // request_token are not set, assume the management mode is LOCAL_OWNER.
  enum ManagementMode {
    // The device is owned locally. The policies are set by the local owner of
    // the device.
    LOCAL_OWNER = 0;
    // The device is enterprise-managed. The policies come from the enterprise
    // server. See the comment above for backward compatibility.
    ENTERPRISE_MANAGED = 1;
    // The device is consumer-managed. The policies currently can only be set
    // by the local owner of the device.
    CONSUMER_MANAGED = 2;
  }
  optional ManagementMode management_mode = 16;

  // Indicates the state that the device should be in.
  optional DeviceState device_state = 17;
}

message PolicyFetchResponse {
  // Since a single policy request may ask for multiple policies, we
  // provide separate error code for each individual policy fetch.

  // We will use standard HTTP Status Code as error code.
  optional int32 error_code = 1;

  // Human readable error message for customer support purpose.
  optional string error_message = 2;

  // This is a serialized |PolicyData| protobuf (defined above).
  optional bytes policy_data = 3;

  // Signature of the policy data above.
  optional bytes policy_data_signature = 4;

  // If the public key has been rotated on the server, the new public
  // key is sent here. It is already used for |policy_data_signature|
  // above, whereas |new_public_key_signature| is created using the
  // old key (so the client can trust the new key). If this is the
  // first time when the client requests policies (so it doesn't have
  // on old public key), then |new_public_key_signature| is empty.
  optional bytes new_public_key = 5;
  optional bytes new_public_key_signature = 6;

  // If new_public_key is specified, this field contains a signature
  // of a PolicyPublicKeyAndDomain protobuf, signed using a key only
  // available to DMServer. The public key portion of this well-known key is
  // embedded into the Chrome binary. The hash of that embedded key is passed
  // to DMServer as verification_key_hash field in PolicyFetchRequest. DMServer
  // will pick a private key on the server which matches the hash (matches
  // public key on the client). If DMServer is unable to find matching key, it
  // will return an error instead of policy data.
  // In case hash was not specified, DMServer will leave verification signature
  // field empty (legacy behavior).
  // In addition to the checks between new_public_key
  // and new_public_key_signature described above, Chrome also verifies
  // new_public_key with the embedded public key and
  // new_public_key_verification_signature.
  optional bytes new_public_key_verification_signature = 7;
}

// Protobuf used to generate the new_public_key_verification_signature field.
message PolicyPublicKeyAndDomain {
  // The public key to sign (taken from the |new_public_key| field in
  // PolicyFetchResponse).
  optional bytes new_public_key = 1;

  // The domain associated with this key (should match the domain portion of
  // the username field of the policy).
  optional string domain = 2;
}

// This protobuf defines a single remote command from server to client for
// execution.
message RemoteCommand {
  enum Type {
    // Simple echo command for testing, will be ignored in production code.
    COMMAND_ECHO_TEST = -1;

    // Reboot the device.
    DEVICE_REBOOT = 0;
  }

  // The command type.
  optional Type type = 1;

  // An opaque unique identifier for the command.
  optional int64 unique_id = 2;

  // The time at which the command was issued, in milliseconds.
  optional int64 timestamp = 3;

  // Extra parameters for this command, might be a serialization of another
  // protobuf.
  optional bytes payload = 4;
}

// This protobuf defines the execution result of a single remote command
// which will be sent back to the server.
message RemoteCommandResult {
  enum ResultType {
    RESULT_IGNORED = 0;  // The command was ignored as obsolete.
    RESULT_FAILURE = 1;  // The command could not be executed.
    RESULT_SUCCESS = 2;  // The command was successfully executed.
  }

  // The result of the command.
  optional ResultType result = 1;

  // The opaque unique identifier of the command. This value is copied from the
  // RemoteCommand protobuf that contained the command.
  optional int64 unique_id = 2;

  // The time at which the command was executed, if the the result is
  // RESULT_SUCCESS.
  optional int64 timestamp = 3;

  // Extra information sent to server as result of execution, might be a
  // serialization of another protobuf.
  optional bytes payload = 4;
}

// Request from device to server for reading policies.
message DevicePolicyRequest {
  // The policy fetch request.  If this field exists, the request must
  // comes from a non-TT client.  The repeated field allows client to
  // request multiple policies for better performance.
  repeated PolicyFetchRequest request = 3;
}

// Response from server to device for reading policies.
message DevicePolicyResponse {
  // The policy fetch response.
  repeated PolicyFetchResponse response = 3;
}

message TimePeriod {
  // [timestamp] is milli seconds since Epoch in UTC timezone.
  optional int64 start_timestamp = 1;
  optional int64 end_timestamp = 2;
}

message ActiveTimePeriod {
  optional TimePeriod time_period = 1;

  // The active duration during the above time period.
  // The unit is milli-second.
  optional int32 active_duration = 2;
}

// This captures launch events for one app/extension or other installments.
message InstallableLaunch {
  optional string install_id = 1;

  // Time duration where this report covers. These are required
  // and the record will be ignored if not set.
  optional TimePeriod duration = 2;

  // Client will send at most 50 timestamps to DM. All the rest
  // launch activities will be summed into the total count.
  // We will distribute the count evenly among the time span when
  // doing time based aggregation.
  repeated int64 timestamp = 3;
  optional int64 total_count = 4;
}

// Used to report the device location.
message DeviceLocation {
  enum ErrorCode {
    ERROR_CODE_NONE                 = 0;
    ERROR_CODE_POSITION_UNAVAILABLE = 1;
  }

  // Latitude in decimal degrees north (WGS84 coordinate frame).
  optional double latitude = 1;

  // Longitude in decimal degrees west (WGS84 coordinate frame).
  optional double longitude = 2;

  // Altitude in meters (above WGS84 datum).
  optional double altitude = 3;

  // Accuracy of horizontal position in meters.
  optional double accuracy = 4;

  // Accuracy of altitude in meters.
  optional double altitude_accuracy = 5;

  // Heading in decimal degrees clockwise from true north.
  optional double heading = 6;

  // Horizontal component of device velocity in meters per second.
  optional double speed = 7;

  // Time of position measurement in milisecons since Epoch in UTC time.
  optional int64 timestamp = 8;

  // Error code, see enum above.
  optional ErrorCode error_code = 9;

  // Human-readable error message.
  optional string error_message = 10;
}

// Details about a network interface.
message NetworkInterface {
  // Indicates the type of network device.
  enum NetworkDeviceType {
    TYPE_ETHERNET = 0;
    TYPE_WIFI = 1;
    TYPE_WIMAX = 2;
    TYPE_BLUETOOTH = 3;
    TYPE_CELLULAR = 4;
  }

  // Network device type.
  optional NetworkDeviceType type = 1;

  // MAC address (if applicable) of the corresponding network device. This is
  // formatted as an ASCII string with 12 hex digits. Example: A0B1C2D3E4F5.
  optional string mac_address = 2;

  // MEID (if applicable) of the corresponding network device. Formatted as
  // ASCII string composed of 14 hex digits. Example: A10000009296F2.
  optional string meid = 3;

  // IMEI (if applicable) of the corresponding network device. 15-16 decimal
  // digits encoded as ASCII string. Example: 355402040158759.
  optional string imei = 4;

  // The device path associated with this network interface.
  optional string device_path = 5;
}


// Information about configured/visible networks - this is separate from
// NetworkInterface because a configured network may not be associated with
// any specific interface, or may be visible across multiple interfaces.
message NetworkState {
  // The current state of this network.
  enum ConnectionState {
    IDLE = 0;
    CARRIER = 1;
    ASSOCIATION = 2;
    CONFIGURATION = 3;
    READY = 4;
    PORTAL = 5;
    OFFLINE = 6;
    ONLINE = 7;
    DISCONNECT = 8;
    FAILURE = 9;
    ACTIVATION_FAILURE = 10;
    UNKNOWN = 11;
  }

  // For networks associated with a device, the path of the device.
  optional string device_path = 1;

  // Current state of this connection as reported by shill.
  optional ConnectionState connection_state = 2;

  // For wireless networks, the signal_strength in dBm.
  optional int32 signal_strength = 3;

  // The IP address this interface is bound to, if any.
  optional string ip_address = 4;

  // The gateway IP for this interface, if any.
  optional string gateway = 5;
}

// Details about a device user.
message DeviceUser {
  // Types of device users which can be reported.
  enum UserType {
    // A user managed by the same domain as the device.
    USER_TYPE_MANAGED = 0;

    // A user not managed by the same domain as the device.
    USER_TYPE_UNMANAGED = 1;
  }

  // The type of the user.
  required UserType type = 1;

  // Email address of the user. Present only if the user type is managed.
  optional string email = 2;
}

// Information about a single disk volume.
message VolumeInfo {
  optional string volume_id = 1;
  optional int64 storage_total = 2;
  optional int64 storage_free = 3;
}

// Report device level status.
message DeviceStatusReportRequest {
  // The OS version reported by the device is a platform version
  // e.g. 1435.0.2011_12_16_1635.
  optional string os_version = 1;
  optional string firmware_version = 2;

  // "Verified", "Dev". Same as verified mode.
  // If the mode is unknown, this field should not be set.
  optional string boot_mode = 3;

  // Device active times collection since last report rpc call.
  // No longer used -- use active_period instead.
  repeated TimePeriod active_time = 4 [deprecated = true];

  // The browser version string as shown in the About dialog.
  // e.g. 17.0.963.18.
  optional string browser_version = 5;

  // A list of periods when the device was active, aggregated by day.
  repeated ActiveTimePeriod active_period = 6;

  // The device location.
  optional DeviceLocation device_location = 7;

  // List of network interfaces.
  repeated NetworkInterface network_interface = 8;

  // List of recent device users, in descending order by last login time.
  repeated DeviceUser user = 9;

  // Disk space + other info about mounted/connected volumes.
  repeated VolumeInfo volume_info = 10;

  // List of visible/configured networks
  repeated NetworkState network_state = 11;

  // Samples of CPU utilization (0-100), sampled once every 120 seconds.
  repeated int32 cpu_utilization_pct = 12;

  // Free RAM (unreliable due to GC).
  optional int64 deprecated_system_ram_free = 13 [deprecated = true];

  // Total RAM on the device.
  optional int64 system_ram_total = 14;

  // Samples of free RAM [in bytes] (unreliable due to GC).
  repeated int64 system_ram_free = 15;
}

// Provides status information for an installed app/extension.
message AppStatus {
  // ID of the installed app/extension
  required string app_id = 1;

  // Currently installed version of the app.
  required string extension_version = 2;

  // Self-reported status summary (via chrome.reporting APIs)
  optional string status = 3;

  // If true, the application is currently in a self-reported error state.
  optional bool error = 4;
}

// Report session (a user on one device) level status.
message SessionStatusReportRequest {
  // Installed apps for this user on this device.
  // No longer used -- use installed_apps instead.
  repeated string installed_app_id = 1 [deprecated = true];

  // Installed extensions for this user on this device.
  // No longer used -- use installed_extensions instead.
  repeated string installed_extension_id = 2 [deprecated = true];

  // One stat per app for top 30 apps.
  repeated InstallableLaunch app_launch_stat = 3;

  // If this is a kiosk session, this is the device local account ID.
  optional string device_local_account_id = 4;

  // Information about installed apps for this user on this device.
  repeated AppStatus installed_apps = 5;

  // Information about installed extensions for this user on this device.
  repeated AppStatus installed_extensions = 6;
}

// Response from DMServer to update devices' status.
// It is possible that status report fails but policy request succeed.  In such
// case, the DeviceStatusReportResponse will contain an error code and the
// device should re-send status report data in the next policy request.  The
// device should re-send report data if policy request fails, even if
// DeviceStatusReportResponse contains no error code.
message DeviceStatusReportResponse {
  optional int32 error_code = 1;

  // Human readable error message for customer support purpose.
  optional string error_message = 2;
}

// Response from DMServer to update user devices' status.
// It is possible that status report fails but policy request succeed.  In such
// case, the SessionStatusReportResponse will contain an error code and the
// device should re-send status report data in the next policy request.  The
// device should re-send report data if policy request fails, even if
// SessionStatusReportResponse contains no error code.
message SessionStatusReportResponse {
  optional int32 error_code = 1;

  // Human readable error message for customer support purpose.
  optional string error_message = 2;
}

// Request from device to server to determine whether the device should
// go through enterprise enrollment. Unlike the other requests, this request is
// not authenticated.
message DeviceAutoEnrollmentRequest {
  // SHA-256 hash of the device's serial number, mod |modulus|.
  // Should always be present.
  optional int64 remainder = 1;

  // Modulus of the hash used by the client. Should always be present. This
  // is the number of buckets the client thinks the server has. For now,
  // it is a power of 2, but due to the strict constraint on how many serial
  // numbers a bucket can contain, it may become non power of 2. If that
  // happens, client-side needs to change its assumption.
  optional int64 modulus = 2;
}

// Response from server to auto-enrollment detection request.
message DeviceAutoEnrollmentResponse {
  // If this field is present, the other fields are ignored and the client
  // should send a new DeviceAutoEnrollmentRequest with a new |remainder|
  // computed using this new |modulus|. If this field is empty, the client's
  // request was accepted.
  // DMServer guarantees that if the modulus sent by client in
  // DeviceAutoEnrollmentRequest matches server's expectation, this field
  // is unset.
  optional int64 expected_modulus = 1;

  // List of hashes in the client's hash bucket. If the client's hash matches
  // any in this list, the client device should do enterprise enrollment.
  // If it matches none, enrollment should be optional.
  // Each entry has exactly 256 bits (32 bytes).
  repeated bytes hash = 2;
}

// Sent by the client to the server. The device management server keeps a
// mapping of device identifiers to device state. Devices query this table after
// hard reset in order recover state. This request is keyed just by the opaque
// server-backed state key; there is no further authentication.
message DeviceStateRetrievalRequest {
  // Opaque, client-determined, unpredictable, stable and unique device
  // identifier to retrieve state for. This field contains 32 bytes of data that
  // looks essentially random to the server. It may be generated e.g. by running
  // a concatenation of suitable device identifiers through a cryptographic hash
  // algorithm such as SHA-256.
  optional bytes server_backed_state_key = 1;
}

// Sent by the client to the server when in registered state to update the
// device-determined device state keys.
message DeviceStateKeyUpdateRequest {
  // The client-determined state keys. To the server, these look like 32 bytes
  // of random data. The client should generate these keys using a deterministic
  // algorithm that takes stable device identifiers as an input and produces a
  // key as the output, possibly by running the identifiers through a
  // cryptographic hash function such as SHA-256.
  repeated bytes server_backed_state_key = 1;
}

// Server to client message carrying the device state response. Because the
// request is not authenticated, the only protection against state extraction
// from server is the unpredictability of the server-backed state ID. Thus, the
// response should not contain any sensitive data. If the server doesn't know
// the requested identifier, it just return a message with restore_mode set to
// RESTORE_MODE_NONE.
message DeviceStateRetrievalResponse {
  // Restorative action to take after device reset.
  enum RestoreMode {
    // No state restoration.
    RESTORE_MODE_NONE = 0;
    // Enterprise enrollment requested, but user may skip.
    RESTORE_MODE_REENROLLMENT_REQUESTED = 1;
    // Enterprise enrollment is enforced and cannot be skipped.
    RESTORE_MODE_REENROLLMENT_ENFORCED = 2;
    // The device has been disabled by its owner. The device will show a warning
    // screen and prevent the user from proceeding further.
    RESTORE_MODE_DISABLED = 3;
  };
  // The server-indicated restore mode.
  optional RestoreMode restore_mode = 1 [default = RESTORE_MODE_NONE];

  // Primary domain the device is associated with.
  optional string management_domain = 2;

  // State that is relevant only when the |restore_mode| is
  // |RESTORE_MODE_DISABLED|.
  optional DisabledState disabled_state = 3;
}

// Sent by the client to the server to pair the Host device with the Controller
// device. The HTTP request contains an end-user OAuth token and only succeeds
// if both Host and Controller devices belong to the end-user domain.
message DevicePairingRequest {

  // The device ID of the Host device.
  optional string host_device_id = 1;

  // The device ID of the Controller device.
  optional string controller_device_id = 2;
}

// Response from the server to the device pairing request.
message DevicePairingResponse {

  // The client should check HTTP status code first. If HTTP status code is not
  // 200 (e.g. 500 internal error), then it means the pairing fails. If HTTP
  // status code is 200, then the client should check the status code within the
  // response.
  enum StatusCode {
    SUCCESS = 0;

    // A generic failure code for pairing.
    FAILED = 1;

    // The Host device cannot be found in the user's domain.
    HOST_DEVICE_NOT_FOUND = 2;

    // The Controller device cannot be found in the user's domain.
    CONTROLLER_DEVICE_NOT_FOUND  = 3;

    // The Host device is deprovisioned.
    HOST_DEVICE_DEPROVISIONED = 4;

    // The Controller device is deprovisioned.
    CONTROLLER_DEVICE_DEPROVISIONED = 5;
  }

  optional StatusCode status_code = 1 [default = FAILED];
}

// Sent by the client to the server to check if the devices are paired. The HTTP
// request contains controller service account OAuth token as well as the
// DMToken from the Host device.
message CheckDevicePairingRequest {

  // The device ID of the Host device.
  optional string host_device_id = 1;

  // The device ID of the Controller device.
  optional string controller_device_id = 2;
}

// Response from the server to the check device pairing request.
message CheckDevicePairingResponse {

  // The client should check HTTP status code first. If HTTP status code is not
  // 200 (e.g. 500 internal error), then it means the pairing status is unknown.
  // If HTTP status code is 200, then the client should check the status code
  // within the response.
  enum StatusCode {
    PAIRED = 0;

    // The Host and Controller devices are not paired.
    NOT_PAIRED = 1;

    // The Host device cannot be found in the Host device domain.
    HOST_DEVICE_NOT_FOUND = 2;

    // The Controller device cannot be found in the Host device domain.
    CONTROLLER_DEVICE_NOT_FOUND  = 3;

    // The Host device is deprovisioned.
    HOST_DEVICE_DEPROVISIONED = 4;

    // The Controller device is deprovisioned.
    CONTROLLER_DEVICE_DEPROVISIONED = 5;

    // Invalid controller identity.
    INVALID_CONTROLLER_DEVICE_IDENTITY = 6;
  }

  optional StatusCode status_code = 1 [default = NOT_PAIRED];
}

// Request from the DMAgent on the device to the DMServer.  This is
// container for all requests from device to server.  The overall HTTP
// request MUST be in the following format:
//
// * HTTP method is POST
// * Data mime type is application/x-protobuffer
// * HTTP parameters are (all required, all case sensitive):
//   * request: MUST BE one of
//     * api_authorization
//     * cert_upload
//     * check_device_pairing
//     * device_pairing
//     * device_state_retrieval
//     * enterprise_check
//     * ping
//     * policy
//     * register
//     * status
//     * unregister
//
//   * devicetype: MUST BE "1" for Android or "2" for Chrome OS.
//   * apptype: MUST BE Android or Chrome.
//   * deviceid: MUST BE no more than 64-char in [\x21-\x7E].
//   * agent: MUST BE a string of characters.
// * HTTP Authorization header MUST be in the following formats:
//   * For register and ping requests
//     Authorization: GoogleLogin auth=<auth cookie for Mobile Sync>
//
//   * For unregister, policy, status, and cert_upload requests
//      Authorization: GoogleDMToken token=<dm token from register>
//
//   * The Authorization header isn't used for enterprise_check
//     request, nor for register requests using OAuth. In the latter case,
//     the OAuth token is passed in the "oauth" parameter.
//
// DeviceManagementRequest should only contain one request which matches the
// HTTP query parameter - request, as listed below. Other requests within the
// container will be ignored.
//   cert_upload: cert_upload_request
//   check_device_pairing: check_device_pairing_request
//   device_pairing: device_pairing_request
//   device_state_retrieval: device_state_retrieval_request
//   enterprise_check: auto_enrollment_request
//   ping: policy_request
//   policy: policy_request
//   register: register_request
//   status: device_status_report_request or session_status_report_request
//   unregister: unregister_request
//
//
message DeviceManagementRequest {
  // Register request.
  optional DeviceRegisterRequest register_request = 1;

  // Unregister request.
  optional DeviceUnregisterRequest unregister_request = 2;

  // Policy request.
  optional DevicePolicyRequest policy_request = 3;

  // Update status.
  optional DeviceStatusReportRequest device_status_report_request = 4;
  optional SessionStatusReportRequest session_status_report_request = 5;

  // Auto-enrollment detection.
  optional DeviceAutoEnrollmentRequest auto_enrollment_request = 6;

  // EMCert upload (for remote attestation)
  optional DeviceCertUploadRequest cert_upload_request = 7;

  // Request for OAuth2 authorization codes to access Google services.
  optional DeviceServiceApiAccessRequest service_api_access_request = 8;

  // Device-state retrieval.
  optional DeviceStateRetrievalRequest device_state_retrieval_request = 9;

  // Device state key update.
  optional DeviceStateKeyUpdateRequest device_state_key_update_request = 10;

  // Pair two devices.
  optional DevicePairingRequest device_pairing_request = 11;

  // Check if two devices are paired.
  optional CheckDevicePairingRequest check_device_pairing_request = 12;
}

// Response from server to device.
//
// The server uses the following numbers as HTTP status codes
// to report top-level errors.
//
// 200 OK: valid response is returned to client.
// 400 Bad Request: invalid argument.
// 401 Unauthorized: invalid auth cookie or DM token.
// 403 Forbidden: device management is not allowed.
// 404 Not Found: the request URL is invalid.
// 410 Device Not Found: the device id is not found.
// 491 Request Pending: the request is pending approval.
// 500 Internal Server Error: most likely a bug in DM server.
// 503 Service Unavailable: most likely a backend error.
// 901 Device Not Found: the device id is not found.
// 902 Policy Not Found: the policy is not found.
message DeviceManagementResponse {
  // Error message.
  optional string error_message = 2;

  // Register response
  optional DeviceRegisterResponse register_response = 3;

  // Unregister response
  optional DeviceUnregisterResponse unregister_response = 4;

  // Policy response.
  optional DevicePolicyResponse policy_response = 5;

  // Device status report response.
  optional DeviceStatusReportResponse device_status_report_response = 6;

  // Session status report response.
  optional SessionStatusReportResponse session_status_report_response = 7;

  // Auto-enrollment detection response.
  optional DeviceAutoEnrollmentResponse auto_enrollment_response = 8;

  // EMCert upload response.
  optional DeviceCertUploadResponse cert_upload_response = 9;

  // Response to OAuth2 authorization code request.
  optional DeviceServiceApiAccessResponse service_api_access_response = 10;

  // Device-state retrieval.
  optional DeviceStateRetrievalResponse device_state_retrieval_response = 11;

  // Response to device pairing request.
  optional DevicePairingResponse device_pairing_response = 12;

  // Response to check device pairing request.
  optional CheckDevicePairingResponse check_device_pairing_response = 13;
}