fleet/server/service/devices.go

package service

import (
	"context"
	"net/http"
	"strconv"
	"time"

	"github.com/fleetdm/fleet/v4/server/contexts/authz"
	"github.com/fleetdm/fleet/v4/server/contexts/ctxerr"
	hostctx "github.com/fleetdm/fleet/v4/server/contexts/host"
	"github.com/fleetdm/fleet/v4/server/contexts/logging"
	"github.com/fleetdm/fleet/v4/server/fleet"
)

/////////////////////////////////////////////////////////////////////////////////
// Ping device endpoint
/////////////////////////////////////////////////////////////////////////////////

type devicePingRequest struct{}

type devicePingResponse struct{}

func (r devicePingResponse) error() error { return nil }

func (r devicePingResponse) hijackRender(ctx context.Context, w http.ResponseWriter) {
	writeCapabilitiesHeader(w, fleet.ServerDeviceCapabilities)
}

// NOTE: we're intentionally not reading the capabilities header in this
// endpoint as is unauthenticated and we don't want to trust whatever comes in
// there.
func devicePingEndpoint(ctx context.Context, request interface{}, svc fleet.Service) (errorer, error) {
	svc.DisableAuthForPing(ctx)
	return devicePingResponse{}, nil
}

func (svc *Service) DisableAuthForPing(ctx context.Context) {
	// skipauth: this endpoint is intentionally public to allow devices to ping
	// the server and among other things, get the fleet.Capabilities header to
	// determine which capabilities are enabled in the server.
	svc.authz.SkipAuthorization(ctx)
}

/////////////////////////////////////////////////////////////////////////////////
// Fleet Desktop endpoints
/////////////////////////////////////////////////////////////////////////////////

type fleetDesktopResponse struct {
	Err             error `json:"error,omitempty"`
	FailingPolicies *uint `json:"failing_policies_count,omitempty"`
}

func (r fleetDesktopResponse) error() error { return r.Err }

type getFleetDesktopRequest struct {
	Token string `url:"token"`
}

func (r *getFleetDesktopRequest) deviceAuthToken() string {
	return r.Token
}

// getFleetDesktopEndpoint is meant to be the only API endpoint used by Fleet Desktop. This
// endpoint should not include any kind of identifying information about the host.
func getFleetDesktopEndpoint(ctx context.Context, request interface{}, svc fleet.Service) (errorer, error) {
	host, ok := hostctx.FromContext(ctx)

	if !ok {
		err := ctxerr.Wrap(ctx, fleet.NewAuthRequiredError("internal error: missing host from request context"))
		return fleetDesktopResponse{Err: err}, nil
	}

	r, err := svc.FailingPoliciesCount(ctx, host)
	if err != nil {
		return fleetDesktopResponse{Err: err}, nil
	}

	return fleetDesktopResponse{FailingPolicies: &r}, nil
}

/////////////////////////////////////////////////////////////////////////////////
// Get Current Device's Host
/////////////////////////////////////////////////////////////////////////////////

type getDeviceHostRequest struct {
	Token string `url:"token"`
}

func (r *getDeviceHostRequest) deviceAuthToken() string {
	return r.Token
}

type getDeviceHostResponse struct {
	Host         *HostDetailResponse      `json:"host"`
	OrgLogoURL   string                   `json:"org_logo_url"`
	Err          error                    `json:"error,omitempty"`
	License      fleet.LicenseInfo        `json:"license"`
	GlobalConfig fleet.DeviceGlobalConfig `json:"global_config"`
}

func (r getDeviceHostResponse) error() error { return r.Err }

func getDeviceHostEndpoint(ctx context.Context, request interface{}, svc fleet.Service) (errorer, error) {
	host, ok := hostctx.FromContext(ctx)
	if !ok {
		err := ctxerr.Wrap(ctx, fleet.NewAuthRequiredError("internal error: missing host from request context"))
		return getDeviceHostResponse{Err: err}, nil
	}

	// must still load the full host details, as it returns more information
	opts := fleet.HostDetailOptions{
		IncludeCVEScores: false,
		IncludePolicies:  false,
	}
	hostDetails, err := svc.GetHost(ctx, host.ID, opts)
	if err != nil {
		return getDeviceHostResponse{Err: err}, nil
	}

	resp, err := hostDetailResponseForHost(ctx, svc, hostDetails)
	if err != nil {
		return getDeviceHostResponse{Err: err}, nil
	}

	// the org logo URL config is required by the frontend to render the page;
	// we need to be careful with what we return from AppConfig in the response
	// as this is a weakly authenticated endpoint (with the device auth token).
	ac, err := svc.AppConfig(ctx)
	if err != nil {
		return getDeviceHostResponse{Err: err}, nil
	}

	license, err := svc.License(ctx)
	if err != nil {
		return getDeviceHostResponse{Err: err}, nil
	}

	deviceGlobalConfig := fleet.DeviceGlobalConfig{
		MDM: fleet.DeviceGlobalMDMConfig{
			EnabledAndConfigured: ac.MDM.EnabledAndConfigured,
		},
	}

	return getDeviceHostResponse{
		Host:         resp,
		OrgLogoURL:   ac.OrgInfo.OrgLogoURL,
		License:      *license,
		GlobalConfig: deviceGlobalConfig,
	}, nil
}

// AuthenticateDevice returns the host identified by the device authentication
// token, along with a boolean indicating if debug logging is enabled for that
// host.
func (svc *Service) AuthenticateDevice(ctx context.Context, authToken string) (*fleet.Host, bool, error) {
	const deviceAuthTokenTTL = time.Hour
	// skipauth: Authorization is currently for user endpoints only.
	svc.authz.SkipAuthorization(ctx)

	if authToken == "" {
		return nil, false, ctxerr.Wrap(ctx, fleet.NewAuthRequiredError("authentication error: missing device authentication token"))
	}

	host, err := svc.ds.LoadHostByDeviceAuthToken(ctx, authToken, deviceAuthTokenTTL)
	switch {
	case err == nil:
		// OK
	case fleet.IsNotFound(err):
		return nil, false, ctxerr.Wrap(ctx, fleet.NewAuthRequiredError("authentication error: invalid device authentication token"))
	default:
		return nil, false, ctxerr.Wrap(ctx, err, "authenticate device")
	}

	return host, svc.debugEnabledForHost(ctx, host.ID), nil
}

/////////////////////////////////////////////////////////////////////////////////
// Refetch Current Device's Host
/////////////////////////////////////////////////////////////////////////////////

type refetchDeviceHostRequest struct {
	Token string `url:"token"`
}

func (r *refetchDeviceHostRequest) deviceAuthToken() string {
	return r.Token
}

func refetchDeviceHostEndpoint(ctx context.Context, request interface{}, svc fleet.Service) (errorer, error) {
	host, ok := hostctx.FromContext(ctx)
	if !ok {
		err := ctxerr.Wrap(ctx, fleet.NewAuthRequiredError("internal error: missing host from request context"))
		return refetchHostResponse{Err: err}, nil
	}

	err := svc.RefetchHost(ctx, host.ID)
	if err != nil {
		return refetchHostResponse{Err: err}, nil
	}
	return refetchHostResponse{}, nil
}

////////////////////////////////////////////////////////////////////////////////
// List Current Device's Host Device Mappings
////////////////////////////////////////////////////////////////////////////////

type listDeviceHostDeviceMappingRequest struct {
	Token string `url:"token"`
}

func (r *listDeviceHostDeviceMappingRequest) deviceAuthToken() string {
	return r.Token
}

func listDeviceHostDeviceMappingEndpoint(ctx context.Context, request interface{}, svc fleet.Service) (errorer, error) {
	host, ok := hostctx.FromContext(ctx)
	if !ok {
		err := ctxerr.Wrap(ctx, fleet.NewAuthRequiredError("internal error: missing host from request context"))
		return listHostDeviceMappingResponse{Err: err}, nil
	}

	dms, err := svc.ListHostDeviceMapping(ctx, host.ID)
	if err != nil {
		return listHostDeviceMappingResponse{Err: err}, nil
	}
	return listHostDeviceMappingResponse{HostID: host.ID, DeviceMapping: dms}, nil
}

////////////////////////////////////////////////////////////////////////////////
// Get Current Device's Macadmins
////////////////////////////////////////////////////////////////////////////////

type getDeviceMacadminsDataRequest struct {
	Token string `url:"token"`
}

func (r *getDeviceMacadminsDataRequest) deviceAuthToken() string {
	return r.Token
}

func getDeviceMacadminsDataEndpoint(ctx context.Context, request interface{}, svc fleet.Service) (errorer, error) {
	host, ok := hostctx.FromContext(ctx)
	if !ok {
		err := ctxerr.Wrap(ctx, fleet.NewAuthRequiredError("internal error: missing host from request context"))
		return getMacadminsDataResponse{Err: err}, nil
	}

	data, err := svc.MacadminsData(ctx, host.ID)
	if err != nil {
		return getMacadminsDataResponse{Err: err}, nil
	}
	return getMacadminsDataResponse{Macadmins: data}, nil
}

////////////////////////////////////////////////////////////////////////////////
// List Current Device's Policies
////////////////////////////////////////////////////////////////////////////////

type listDevicePoliciesRequest struct {
	Token string `url:"token"`
}

func (r *listDevicePoliciesRequest) deviceAuthToken() string {
	return r.Token
}

type listDevicePoliciesResponse struct {
	Err      error               `json:"error,omitempty"`
	Policies []*fleet.HostPolicy `json:"policies"`
}

func (r listDevicePoliciesResponse) error() error { return r.Err }

func listDevicePoliciesEndpoint(ctx context.Context, request interface{}, svc fleet.Service) (errorer, error) {
	host, ok := hostctx.FromContext(ctx)
	if !ok {
		err := ctxerr.Wrap(ctx, fleet.NewAuthRequiredError("internal error: missing host from request context"))
		return listDevicePoliciesResponse{Err: err}, nil
	}

	data, err := svc.ListDevicePolicies(ctx, host)
	if err != nil {
		return listDevicePoliciesResponse{Err: err}, nil
	}

	return listDevicePoliciesResponse{Policies: data}, nil
}

func (svc *Service) ListDevicePolicies(ctx context.Context, host *fleet.Host) ([]*fleet.HostPolicy, error) {
	// skipauth: No authorization check needed due to implementation returning
	// only license error.
	svc.authz.SkipAuthorization(ctx)

	return nil, fleet.ErrMissingLicense
}

func (svc *Service) FailingPoliciesCount(ctx context.Context, host *fleet.Host) (uint, error) {
	// skipauth: No authorization check needed due to implementation returning
	// only license error.
	svc.authz.SkipAuthorization(ctx)

	return 0, fleet.ErrMissingLicense
}

////////////////////////////////////////////////////////////////////////////////
// Transparency URL Redirect
////////////////////////////////////////////////////////////////////////////////

type transparencyURLRequest struct {
	Token string `url:"token"`
}

func (r *transparencyURLRequest) deviceAuthToken() string {
	return r.Token
}

type transparencyURLResponse struct {
	RedirectURL string `json:"-"` // used to control the redirect, see hijackRender method
	Err         error  `json:"error,omitempty"`
}

func (r transparencyURLResponse) hijackRender(ctx context.Context, w http.ResponseWriter) {
	w.Header().Set("Location", r.RedirectURL)
	w.WriteHeader(http.StatusTemporaryRedirect)
}

func (r transparencyURLResponse) error() error { return r.Err }

func transparencyURL(ctx context.Context, request interface{}, svc fleet.Service) (errorer, error) {
	config, err := svc.AppConfig(ctx)
	if err != nil {
		return transparencyURLResponse{Err: err}, nil
	}

	license, err := svc.License(ctx)
	if err != nil {
		return transparencyURLResponse{Err: err}, nil
	}

	transparencyURL := fleet.DefaultTransparencyURL
	// Fleet Premium license is required for custom transparency url
	if license.Tier == "premium" && config.FleetDesktop.TransparencyURL != "" {
		transparencyURL = config.FleetDesktop.TransparencyURL
	}

	return transparencyURLResponse{RedirectURL: transparencyURL}, nil
}

////////////////////////////////////////////////////////////////////////////////
// Get Current Device's MDM Apple Enrollment Profile
////////////////////////////////////////////////////////////////////////////////

type getDeviceMDMManualEnrollProfileRequest struct {
	Token string `url:"token"`
}

func (r *getDeviceMDMManualEnrollProfileRequest) deviceAuthToken() string {
	return r.Token
}

type getDeviceMDMManualEnrollProfileResponse struct {
	// Profile field is used in hijackRender for the response.
	Profile []byte

	Err error `json:"error,omitempty"`
}

func (r getDeviceMDMManualEnrollProfileResponse) hijackRender(ctx context.Context, w http.ResponseWriter) {
	// make the browser download the content to a file
	w.Header().Add("Content-Disposition", `attachment; filename="fleet-mdm-enrollment-profile.mobileconfig"`)
	// explicitly set the content length before the write, so the caller can
	// detect short writes (if it fails to send the full content properly)
	w.Header().Set("Content-Length", strconv.FormatInt(int64(len(r.Profile)), 10))
	// this content type will make macos open the profile with the proper application
	w.Header().Set("Content-Type", "application/x-apple-aspen-config; charset=urf-8")
	// prevent detection of content, obey the provided content-type
	w.Header().Set("X-Content-Type-Options", "nosniff")

	if n, err := w.Write(r.Profile); err != nil {
		logging.WithExtras(ctx, "err", err, "written", n)
	}
}

func (r getDeviceMDMManualEnrollProfileResponse) error() error { return r.Err }

func getDeviceMDMManualEnrollProfileEndpoint(ctx context.Context, request interface{}, svc fleet.Service) (errorer, error) {
	// this call ensures that the authentication was done, no need to actually
	// use the host
	if _, ok := hostctx.FromContext(ctx); !ok {
		err := ctxerr.Wrap(ctx, fleet.NewAuthRequiredError("internal error: missing host from request context"))
		return getDeviceMDMManualEnrollProfileResponse{Err: err}, nil
	}

	profile, err := svc.GetDeviceMDMAppleEnrollmentProfile(ctx)
	if err != nil {
		return getDeviceMDMManualEnrollProfileResponse{Err: err}, nil
	}
	return getDeviceMDMManualEnrollProfileResponse{Profile: profile}, nil
}

func (svc *Service) GetDeviceMDMAppleEnrollmentProfile(ctx context.Context) ([]byte, error) {
	// must be device-authenticated, no additional authorization is required
	if !svc.authz.IsAuthenticatedWith(ctx, authz.AuthnDeviceToken) {
		return nil, ctxerr.Wrap(ctx, fleet.NewPermissionError("forbidden: only device-authenticated hosts can access this endpoint"))
	}

	appConfig, err := svc.ds.AppConfig(ctx)
	if err != nil {
		return nil, ctxerr.Wrap(ctx, err)
	}

	mobileConfig, err := generateEnrollmentProfileMobileconfig(
		appConfig.OrgInfo.OrgName,
		appConfig.ServerSettings.ServerURL,
		svc.config.MDMApple.SCEP.Challenge,
		svc.mdmPushCertTopic,
	)
	if err != nil {
		return nil, ctxerr.Wrap(ctx, err)
	}
	return mobileConfig, nil
}