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package wmiexec
import (
"context"
"encoding/json"
"errors"
"fmt"
"github.com/FalconOpsLLC/goexec/internal/exec"
"github.com/RedTeamPentesting/adauth"
"github.com/RedTeamPentesting/adauth/dcerpcauth"
"github.com/oiweiwei/go-msrpc/dcerpc"
"github.com/oiweiwei/go-msrpc/msrpc/dcom"
"github.com/oiweiwei/go-msrpc/msrpc/dcom/iactivation/v0"
"github.com/oiweiwei/go-msrpc/msrpc/dcom/wmi"
"github.com/oiweiwei/go-msrpc/msrpc/dcom/wmi/iwbemlevel1login/v0"
"github.com/oiweiwei/go-msrpc/msrpc/dcom/wmi/iwbemservices/v0"
"github.com/oiweiwei/go-msrpc/ssp/gssapi"
"github.com/rs/zerolog"
)
const (
ProtocolSequenceRPC uint16 = 7
ProtocolSequenceNP uint16 = 15
)
var (
ComVersion = &dcom.COMVersion{
MajorVersion: 5,
MinorVersion: 7,
}
ORPCThis = &dcom.ORPCThis{Version: ComVersion}
)
func (mod *Module) Cleanup(ctx context.Context, _ *exec.CleanupConfig) (err error) {
log := zerolog.Ctx(ctx).With().
Str("module", "tsch").
Str("func", "Cleanup").Logger()
if err = mod.dce.Close(ctx); err != nil {
log.Warn().Err(err).Msg("Failed to close DCERPC connection")
}
mod.sc = nil
mod.dce = nil
return
}
func (mod *Module) Connect(ctx context.Context, creds *adauth.Credential, target *adauth.Target, _ *exec.ConnectionConfig) (err error) {
var baseOpts, authOpts []dcerpc.Option
var ipid *dcom.IPID // This will store the IPID of the remote instance
var bind2Opts []dcerpc.Option
ctx = gssapi.NewSecurityContext(ctx)
log := zerolog.Ctx(ctx).With().
Str("module", "tsch").
Str("func", "Connect").Logger()
// Assemble DCERPC options
{
baseOpts = []dcerpc.Option{
dcerpc.WithLogger(log),
dcerpc.WithSign(), // Enforce signing
dcerpc.WithSeal(), // Enforce packet stub encryption
}
// Add target name option if possible
if tn, err := target.Hostname(ctx); err == nil {
baseOpts = append(baseOpts, dcerpc.WithTargetName(tn))
} else {
log.Debug().Err(err).Msg("Failed to get target hostname")
}
// Parse target and credentials
if authOpts, err = dcerpcauth.AuthenticationOptions(ctx, creds, target, &dcerpcauth.Options{}); err != nil {
return fmt.Errorf("parse authentication options: %w", err)
}
}
// Establish first connection (REMACT)
{
// Connection options
rp := "ncacn_ip_tcp" // Underlying protocol
ro := 135 // RPC port
rb := fmt.Sprintf("%s:[%d]", rp, ro) // RPC binding
// Create DCERPC dialer
mod.dce, err = dcerpc.Dial(ctx, target.AddressWithoutPort(), append(baseOpts, append(authOpts, dcerpc.WithEndpoint(rb))...)...)
if err != nil {
return fmt.Errorf("create DCERPC dialer: %w", err)
}
// Create remote activation client
ia, err := iactivation.NewActivationClient(ctx, mod.dce, append(baseOpts, dcerpc.WithEndpoint(rb))...)
if err != nil {
return fmt.Errorf("create activation client: %w", err)
}
// Send remote activation request
act, err := ia.RemoteActivation(ctx, &iactivation.RemoteActivationRequest{
ORPCThis: ORPCThis,
ClassID: wmi.Level1LoginClassID.GUID(),
IIDs: []*dcom.IID{iwbemlevel1login.Level1LoginIID},
RequestedProtocolSequences: []uint16{ProtocolSequenceRPC, ProtocolSequenceNP}, // TODO: dynamic
})
if err != nil {
return fmt.Errorf("request remote activation: %w", err)
}
if act.HResult != 0 {
return fmt.Errorf("remote activation failed with code %d", act.HResult)
}
retBinds := act.OXIDBindings.GetStringBindings()
if len(act.InterfaceData) < 1 || len(retBinds) < 1 {
return errors.New("remote activation failed")
}
ipid = act.InterfaceData[0].GetStandardObjectReference().Std.IPID
// This ensures that the original target address/hostname is used in the string binding
origBind := retBinds[0].String()
if bind, err := dcerpc.ParseStringBinding(origBind); err != nil {
log.Warn().Str("binding", origBind).Err(err).Msg("Failed to parse binding string returned by server")
bind2Opts = act.OXIDBindings.EndpointsByProtocol(rp) // Try using the server supplied string binding
} else {
bind.NetworkAddress = target.AddressWithoutPort() // Replace address/hostname in new string binding
bs := bind.String()
log.Info().Str("binding", bs).Msg("found binding")
bind2Opts = append(bind2Opts, dcerpc.WithEndpoint(bs)) // Use the new string binding
}
}
// Establish second connection (WMI)
{
bind2Opts = append(bind2Opts, authOpts...)
mod.dce, err = dcerpc.Dial(ctx, target.AddressWithoutPort(), append(baseOpts, bind2Opts...)...)
if err != nil {
return fmt.Errorf("dial WMI: %w", err)
}
// Create login client
loginClient, err := iwbemlevel1login.NewLevel1LoginClient(ctx, mod.dce, append(baseOpts, dcom.WithIPID(ipid))...)
if err != nil {
return fmt.Errorf("initialize wbem login client: %w", err)
}
login, err := loginClient.NTLMLogin(ctx, &iwbemlevel1login.NTLMLoginRequest{ // TODO: Other login opts/methods?
This: ORPCThis,
NetworkResource: "//./root/cimv2", // TODO: make this dynamic
})
if err != nil {
return fmt.Errorf("ntlm login: %w", err)
}
mod.sc, err = iwbemservices.NewServicesClient(ctx, mod.dce, dcom.WithIPID(login.Namespace.InterfacePointer().IPID()))
if err != nil {
return fmt.Errorf("iwbemservices.NewServicesClient: %w", err)
}
}
return nil
}
func (mod *Module) Exec(ctx context.Context, ecfg *exec.ExecutionConfig) (err error) {
log := zerolog.Ctx(ctx).With().
Str("module", "tsch").
Str("method", ecfg.ExecutionMethod).Logger()
if ecfg.ExecutionMethod == MethodCustom {
if cfg, ok := ecfg.ExecutionMethodConfig.(MethodCustomConfig); !ok {
return errors.New("invalid execution configuration")
} else {
out, err := mod.query(ctx, cfg.Class, cfg.Method, cfg.Arguments)
if err != nil {
return fmt.Errorf("query: %w", err)
}
if outJson, err := json.Marshal(out); err != nil {
log.Error().Err(err).Msg("failed to marshal call output")
} else {
fmt.Println(string(outJson))
}
}
} else if ecfg.ExecutionMethod == MethodProcess {
if cfg, ok := ecfg.ExecutionMethodConfig.(MethodProcessConfig); !ok {
return errors.New("invalid execution configuration")
} else {
out, err := mod.query(ctx, "Win32_Process", "Create", map[string]any{
"CommandLine": cfg.Command,
"WorkingDir": cfg.WorkingDirectory,
})
if err != nil {
return fmt.Errorf("query: %w", err)
}
if pid, ok := out["ProcessId"]; ok && pid != nil {
log.Info().
Any("PID", pid).
Any("return", out["ReturnValue"]).
Msg("Process created")
} else {
log.Error().
Any("return", out["ReturnValue"]).
Msg("Process creation failed")
return errors.New("failed to create process")
}
}
} else {
return errors.New("unsupported execution method")
}
return nil
}
|