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package cmd
import (
"context"
"github.com/FalconOpsLLC/goexec/internal/util"
"github.com/FalconOpsLLC/goexec/pkg/goexec"
tschexec "github.com/FalconOpsLLC/goexec/pkg/goexec/tsch"
"github.com/oiweiwei/go-msrpc/ssp/gssapi"
"github.com/spf13/cobra"
"io"
"os"
"time"
)
func tschCmdInit() {
registerRpcFlags(tschCmd)
tschDemandCmdInit()
tschCmd.AddCommand(tschDemandCmd)
tschCreateCmdInit()
tschCmd.AddCommand(tschCreateCmd)
}
func argsTschTaskIdentifiers(name, path string) error {
switch {
case path != "":
return tschexec.ValidateTaskPath(path)
case name != "":
return tschexec.ValidateTaskName(name)
default:
}
return nil
}
func argsTschDemand(_ *cobra.Command, _ []string) error {
return argsTschTaskIdentifiers(tschDemand.TaskName, tschDemand.TaskPath)
}
func argsTschCreate(_ *cobra.Command, _ []string) error {
return argsTschTaskIdentifiers(tschCreate.TaskName, tschCreate.TaskPath)
}
func tschDemandCmdInit() {
tschDemandCmd.Flags().StringVarP(&tschDemand.TaskName, "name", "t", "", "Name of task to register")
tschDemandCmd.Flags().StringVarP(&tschDemand.TaskPath, "path", "P", "", "Path of task to register")
tschDemandCmd.Flags().Uint32Var(&tschDemand.SessionId, "session", 0, "Hijack existing session given the session ID")
tschDemandCmd.Flags().BoolVar(&tschDemand.NoDelete, "no-delete", false, "Don't delete task after execution")
tschDemandCmd.Flags().StringVar(&tschDemand.UserSid, "sid", "S-1-5-18", "User SID to impersonate")
registerProcessExecutionArgs(tschDemandCmd)
registerExecutionOutputArgs(tschDemandCmd)
tschDemandCmd.MarkFlagsMutuallyExclusive("name", "path")
}
func tschCreateCmdInit() {
tschCreateCmd.Flags().StringVarP(&tschCreate.TaskName, "name", "t", "", "Name of task to register")
tschCreateCmd.Flags().StringVarP(&tschCreate.TaskPath, "path", "P", "", "Path of task to register")
tschCreateCmd.Flags().DurationVar(&tschCreate.StopDelay, "delay-stop", 5*time.Second, "Delay between task execution and termination. This will not stop the process spawned by the task")
tschCreateCmd.Flags().DurationVar(&tschCreate.StartDelay, "start-delay", 5*time.Second, "Delay between task registration and execution")
tschCreateCmd.Flags().DurationVar(&tschCreate.DeleteDelay, "delete-delay", 0*time.Second, "Delay between task termination and deletion")
tschCreateCmd.Flags().BoolVar(&tschCreate.NoDelete, "no-delete", false, "Don't delete task after execution")
tschCreateCmd.Flags().BoolVar(&tschCreate.CallDelete, "call-delete", false, "Directly call SchRpcDelete to delete task")
tschCreateCmd.Flags().StringVar(&tschCreate.UserSid, "sid", "S-1-5-18", "User SID to impersonate")
registerProcessExecutionArgs(tschCreateCmd)
tschCreateCmd.MarkFlagsMutuallyExclusive("name", "path")
}
var (
tschDemand tschexec.TschDemand
tschCreate tschexec.TschCreate
tschCmd = &cobra.Command{
Use: "tsch",
Short: "Establish execution via Windows Task Scheduler (MS-TSCH)",
Args: cobra.NoArgs,
}
tschDemandCmd = &cobra.Command{
Use: "demand [target]",
Short: "Register a remote scheduled task and demand immediate start",
Long: `Description:
Similar to the create method, the demand method will call SchRpcRegisterTask,
But rather than setting a defined time when the task will start, it will
additionally call SchRpcRun to forcefully start the task.
References:
SchRpcRegisterTask - https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-tsch/849c131a-64e4-46ef-b015-9d4c599c5167
SchRpcRun - https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-tsch/77f2250d-500a-40ee-be18-c82f7079c4f0
`,
Args: args(
argsRpcClient("cifs"),
argsSmbClient(),
argsTschDemand,
),
Run: func(cmd *cobra.Command, args []string) {
var err error
tschDemand.Client = &rpcClient
tschDemand.IO = exec
if tschDemand.TaskName == "" && tschDemand.TaskPath == "" {
tschDemand.TaskPath = `\` + util.RandomString()
}
ctx := log.WithContext(gssapi.NewSecurityContext(context.TODO()))
var writer io.WriteCloser
if outputPath == "-" {
writer = os.Stdout
} else if outputPath != "" {
if writer, err = os.OpenFile(outputPath, os.O_WRONLY|os.O_CREATE, 0644); err != nil {
log.Fatal().Err(err).Msg("Failed to open output file")
}
defer writer.Close()
}
if err = goexec.ExecuteCleanMethod(ctx, &tschDemand, &exec); err != nil {
log.Fatal().Err(err).Msg("Operation failed")
}
if outputPath != "" {
if reader, err := tschDemand.GetOutput(ctx); err == nil {
_, err = io.Copy(writer, reader)
} else {
log.Error().Err(err).Msg("Failed to get process execution output")
returnCode = 2
}
}
},
}
tschCreateCmd = &cobra.Command{
Use: "create [target]",
Short: "Create a remote scheduled task with an automatic start time",
Long: `Description:
The create method calls SchRpcRegisterTask to register a scheduled task
with an automatic start time.This method avoids directly calling SchRpcRun,
and can even avoid calling SchRpcDelete by populating the DeleteExpiredTaskAfter
Setting.
References:
SchRpcRegisterTask - https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-tsch/849c131a-64e4-46ef-b015-9d4c599c5167
SchRpcRun - https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-tsch/77f2250d-500a-40ee-be18-c82f7079c4f0
SchRpcDelete - https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-tsch/360bb9b1-dd2a-4b36-83ee-21f12cb97cff
DeleteExpiredTaskAfter - https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-tsch/6bfde6fe-440e-4ddd-b4d6-c8fc0bc06fae
`,
Args: args(
argsRpcClient("cifs"),
argsSmbClient(),
argsTschCreate,
),
Run: func(cmd *cobra.Command, args []string) {
var err error
tschCreate.Tsch.Client = &rpcClient
tschCreate.IO = exec
if tschCreate.TaskName == "" && tschDemand.TaskPath == "" {
tschCreate.TaskPath = `\` + util.RandomString()
}
ctx := log.WithContext(gssapi.NewSecurityContext(context.TODO()))
var writer io.WriteCloser
if outputPath == "-" {
writer = os.Stdout
} else if outputPath != "" {
if writer, err = os.OpenFile(outputPath, os.O_WRONLY|os.O_CREATE, 0644); err != nil {
log.Fatal().Err(err).Msg("Failed to open output file")
}
defer writer.Close()
}
if err = goexec.ExecuteCleanMethod(ctx, &tschDemand, &exec); err != nil {
log.Fatal().Err(err).Msg("Operation failed")
}
if outputPath != "" {
if reader, err := tschDemand.GetOutput(ctx); err == nil {
_, err = io.Copy(writer, reader)
} else {
log.Error().Err(err).Msg("Failed to get process execution output")
returnCode = 2
}
}
},
}
)
|