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package tschexec
import (
"context"
"errors"
"fmt"
"github.com/FalconOpsLLC/goexec/internal/client/dce"
"github.com/FalconOpsLLC/goexec/internal/exec"
"github.com/FalconOpsLLC/goexec/internal/util"
"github.com/RedTeamPentesting/adauth"
"github.com/RedTeamPentesting/adauth/dcerpcauth"
"github.com/oiweiwei/go-msrpc/dcerpc"
"github.com/oiweiwei/go-msrpc/midl/uuid"
"github.com/oiweiwei/go-msrpc/msrpc/epm/epm/v3"
"github.com/oiweiwei/go-msrpc/msrpc/tsch/itaskschedulerservice/v1"
"github.com/oiweiwei/go-msrpc/ssp/gssapi"
"github.com/rs/zerolog"
"time"
)
const (
DefaultEndpoint = "ncacn_np:[atsvc]"
)
var (
TschRpcUuid = uuid.MustParse("86D35949-83C9-4044-B424-DB363231FD0C")
SupportedEndpointProtocols = []string{"ncacn_np", "ncacn_ip_tcp"}
)
// Connect to the target & initialize DCE & TSCH clients
func (mod *Module) Connect(ctx context.Context, creds *adauth.Credential, target *adauth.Target, ccfg *exec.ConnectionConfig) (err error) {
//var port uint16
var endpoint string = DefaultEndpoint
var epmOpts []dcerpc.Option
var dceOpts []dcerpc.Option
log := zerolog.Ctx(ctx).With().
Str("func", "Connect").Logger()
if mod.dce == nil {
if ccfg.ConnectionMethod == exec.ConnectionMethodDCE {
if cfg, ok := ccfg.ConnectionMethodConfig.(dce.ConnectionMethodDCEConfig); !ok {
return fmt.Errorf("invalid configuration for DCE connection method")
} else {
// Connect to ITaskSchedulerService
{
// Parse target & creds
ctx = gssapi.NewSecurityContext(ctx)
ao, err := dcerpcauth.AuthenticationOptions(ctx, creds, target, &dcerpcauth.Options{})
if err != nil {
log.Error().Err(err).Msg("Failed to parse authentication options")
return fmt.Errorf("parse auth options: %w", err)
}
dceOpts = append(cfg.Options,
dcerpc.WithLogger(log),
dcerpc.WithSecurityLevel(dcerpc.AuthLevelPktPrivacy), // AuthLevelPktPrivacy is required for TSCH/ATSVC
dcerpc.WithObjectUUID(TschRpcUuid))
if cfg.Endpoint != nil {
endpoint = cfg.Endpoint.String()
}
if cfg.NoEpm {
dceOpts = append(dceOpts, dcerpc.WithEndpoint(endpoint))
} else {
epmOpts = append(epmOpts, dceOpts...)
dceOpts = append(dceOpts,
epm.EndpointMapper(ctx, target.AddressWithoutPort(), append(epmOpts, ao...)...))
if !cfg.EpmAuto {
dceOpts = append(dceOpts, dcerpc.WithEndpoint(endpoint))
}
}
log = log.With().Str("endpoint", endpoint).Logger()
log.Info().Msg("Connecting to target")
// Create DCERPC dialer
mod.dce, err = dcerpc.Dial(ctx, target.AddressWithoutPort(), append(dceOpts, ao...)...)
if err != nil {
log.Error().Err(err).Msg("Failed to create DCERPC dialer")
return fmt.Errorf("create DCERPC dialer: %w", err)
}
// Create ITaskSchedulerService
mod.tsch, err = itaskschedulerservice.NewTaskSchedulerServiceClient(ctx, mod.dce)
if err != nil {
log.Error().Err(err).Msg("Failed to initialize TSCH client")
return fmt.Errorf("init TSCH client: %w", err)
}
log.Info().Msg("DCE connection successful")
}
}
} else {
return errors.New("unsupported connection method")
}
}
return
}
func (mod *Module) Cleanup(ctx context.Context, ccfg *exec.CleanupConfig) (err error) {
log := zerolog.Ctx(ctx).With().
Str("method", ccfg.CleanupMethod).
Str("func", "Cleanup").Logger()
if ccfg.CleanupMethod == MethodDelete {
if cfg, ok := ccfg.CleanupMethodConfig.(MethodDeleteConfig); !ok {
return errors.New("invalid configuration")
} else {
log = log.With().Str("task", cfg.TaskPath).Logger()
log.Info().Msg("Manually deleting task")
if err = mod.deleteTask(ctx, cfg.TaskPath); err == nil {
log.Info().Msg("Task deleted successfully")
}
}
} else if ccfg.CleanupMethod == "" {
return nil
} else {
return fmt.Errorf("unsupported cleanup method")
}
return
}
func (mod *Module) Exec(ctx context.Context, ecfg *exec.ExecutionConfig) (err error) {
log := zerolog.Ctx(ctx).With().
Str("method", ecfg.ExecutionMethod).
Str("func", "Exec").Logger()
if ecfg.ExecutionMethod == MethodRegister {
if cfg, ok := ecfg.ExecutionMethodConfig.(MethodRegisterConfig); !ok {
return errors.New("invalid configuration")
} else {
startTime := time.Now().UTC().Add(cfg.StartDelay)
stopTime := startTime.Add(cfg.StopDelay)
tr := taskTimeTrigger{
StartBoundary: startTime.Format(TaskXMLDurationFormat),
//EndBoundary: stopTime.Format(TaskXMLDurationFormat),
Enabled: true,
}
tk := newTask(nil, nil, triggers{TimeTriggers: []taskTimeTrigger{tr}}, ecfg.ExecutableName, ecfg.ExecutableArgs)
if !cfg.NoDelete && !cfg.CallDelete {
if cfg.StopDelay == 0 {
cfg.StopDelay = time.Second
}
tk.Settings.DeleteExpiredTaskAfter = xmlDuration(cfg.DeleteDelay)
tk.Triggers.TimeTriggers[0].EndBoundary = stopTime.Format(TaskXMLDurationFormat)
}
taskPath := cfg.TaskPath
if taskPath == "" {
log.Debug().Msg("Task path not defined. Using random path")
taskPath = `\` + util.RandomString()
}
// The taskPath is changed here to the *actual path returned by SchRpcRegisterTask
taskPath, err = mod.registerTask(ctx, *tk, taskPath)
if err != nil {
return fmt.Errorf("call registerTask: %w", err)
}
if !cfg.NoDelete {
if cfg.CallDelete {
defer mod.deleteTask(ctx, taskPath)
log.Info().Dur("ms", cfg.StartDelay).Msg("Waiting for task to run")
select {
case <-ctx.Done():
log.Warn().Msg("Cancelling execution")
return err
case <-time.After(cfg.StartDelay + time.Second): // + one second for good measure
for {
if stat, err := mod.tsch.GetLastRunInfo(ctx, &itaskschedulerservice.GetLastRunInfoRequest{Path: taskPath}); err != nil {
log.Warn().Err(err).Msg("Failed to get last run info. Assuming task was executed")
break
} else if stat.LastRuntime.AsTime().IsZero() {
log.Warn().Msg("Task was not yet run. Waiting 10 additional seconds")
time.Sleep(10 * time.Second)
} else {
break
}
}
break
}
} else {
log.Info().Time("when", stopTime).Msg("Task is scheduled to delete")
}
}
}
} else if ecfg.ExecutionMethod == MethodDemand {
if cfg, ok := ecfg.ExecutionMethodConfig.(MethodDemandConfig); !ok {
return errors.New("invalid configuration")
} else {
taskPath := cfg.TaskPath
if taskPath == "" {
log.Debug().Msg("Task path not defined. Using random path")
taskPath = `\` + util.RandomString()
}
st := newSettings(true, true, false)
tk := newTask(st, nil, triggers{}, ecfg.ExecutableName, ecfg.ExecutableArgs)
// The taskPath is changed here to the *actual path returned by SchRpcRegisterTask
taskPath, err = mod.registerTask(ctx, *tk, taskPath)
if err != nil {
return fmt.Errorf("call registerTask: %w", err)
}
if !cfg.NoDelete {
defer mod.deleteTask(ctx, taskPath)
}
_, err := mod.tsch.Run(ctx, &itaskschedulerservice.RunRequest{
Path: taskPath,
Flags: 0, // Maybe we want to use these?
})
if err != nil {
log.Error().Str("task", taskPath).Err(err).Msg("Failed to run task")
return fmt.Errorf("force run task: %w", err)
}
log.Info().Str("task", taskPath).Msg("Started task")
}
} else {
return fmt.Errorf("method '%s' not implemented", ecfg.ExecutionMethod)
}
return nil
}
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