Adding getprivs command for Windows

client/command/commands.go

@@ -2168,4 +2168,22 @@ func BindCommands(con *console.SliverConsoleClient) {
 		},
 	}
 	con.App.AddCommand(dllhijackCmd)
+
+	// [ Get Privs ] -----------------------------------------------------------------
+	getprivsCmd := &grumble.Command{
+		Name:      consts.GetPrivsStr,
+		Help:      "Get current privileges (Windows)",
+		LongHelp:  help.GetHelpFor([]string{consts.GetPrivsStr}),
+		HelpGroup: consts.SliverWinHelpGroup,
+		Run: func(ctx *grumble.Context) error {
+			con.Println()
+			privilege.GetPrivsCmd(ctx, con)
+			con.Println()
+			return nil
+		},
+		Flags: func(f *grumble.Flags) {
+			f.Int("t", "timeout", defaultTimeout, "command timeout in seconds")
+		},
+	}
+	con.App.AddCommand(getprivsCmd)
 }

client/command/help/long-help.go

@@ -627,6 +627,10 @@ dllhijack --reference-path c:\\windows\\system32\\msasn1.dll --profile dll c:\\u
 
 # Use a local DLL as the reference DLL
 dllhijack --reference-path c:\\windows\\system32\\msasn1.dll --reference-file /tmp/msasn1.dll.orig --profile dll c:\\users\\bob\\appdata\\slack\\app-4.18.0\\msasn1.dll
+`
+
+	getPrivsHelp = `[[.Bold]]Command:[[.Normal]] getprivs
+[[.Bold]]About:[[.Normal]] Get privilege information for the current process (Windows only).
 `
 )
 

client/command/privilege/getprivs.go

@@ -0,0 +1,99 @@
+package privilege
+
+import (
+	"context"
+
+	"github.com/bishopfox/sliver/client/console"
+	"github.com/bishopfox/sliver/protobuf/sliverpb"
+	"github.com/desertbit/grumble"
+)
+
+/*
+	Sliver Implant Framework
+	Copyright (C) 2021  Bishop Fox
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+func GetPrivsCmd(ctx *grumble.Context, con *console.SliverConsoleClient) {
+	session := con.ActiveSession.GetInteractive()
+	if session == nil {
+		return
+	}
+
+	if session.OS != "windows" {
+		con.PrintErrorf("Command not supported on this operating system.")
+		return
+	}
+
+	privs, err := con.Rpc.GetPrivs(context.Background(), &sliverpb.GetPrivsReq{
+		Request: con.ActiveSession.Request(ctx),
+	})
+
+	if err != nil {
+		con.PrintErrorf("%s\n", err)
+		return
+	}
+
+	// Response is the Envelope (see RPC API), Err is part of it.
+	if privs.Response != nil && privs.Response.Err != "" {
+		con.PrintErrorf("NOTE: Information may be incomplete due to an error:\n")
+		con.PrintErrorf("%s\n", privs.Response.Err)
+	}
+
+	if privs.PrivInfo == nil {
+		return
+	}
+
+	// To make things look pretty, figure out the longest name and description
+	// for column width
+	var nameColumnWidth int = 0
+	var descriptionColumnWidth int = 0
+
+	for _, entry := range privs.PrivInfo {
+		if len(entry.Name) > nameColumnWidth {
+			nameColumnWidth = len(entry.Name)
+		}
+		if len(entry.Description) > descriptionColumnWidth {
+			descriptionColumnWidth = len(entry.Description)
+		}
+	}
+
+	// Give one more space
+	nameColumnWidth += 1
+	descriptionColumnWidth += 1
+
+	con.Println("Privilege Information for Current Process")
+	con.Println("-----------------------------------------")
+	con.Printf("%-*s\t%-*s\t%s\n", nameColumnWidth, "Name", descriptionColumnWidth, "Description", "Attributes")
+	con.Printf("%-*s\t%-*s\t%s\n", nameColumnWidth, "====", descriptionColumnWidth, "===========", "==========")
+	for _, entry := range privs.PrivInfo {
+		con.Printf("%-*s\t%-*s\t(", nameColumnWidth, entry.Name, descriptionColumnWidth, entry.Description)
+		if entry.Enabled {
+			con.Printf("Enabled")
+		} else {
+			con.Printf("Disabled")
+		}
+		if entry.EnabledByDefault {
+			con.Printf(", Enabled by Default")
+		}
+		if entry.Removed {
+			con.Printf(", Removed")
+		}
+		if entry.UsedForAccess {
+			con.Printf(", Used for Access")
+		}
+		con.Printf(")\n")
+	}
+}

client/constants/constants.go

@@ -206,6 +206,8 @@ const (
 	ReactionStr = "reaction"
 
 	LicensesStr = "licenses"
+
+	GetPrivsStr = "getprivs"
 )
 
 // Groups

implant/sliver/handlers/handlers_windows.go

@@ -61,6 +61,7 @@ var (
 		sliverpb.MsgSetEnvReq:                setEnvHandler,
 		sliverpb.MsgUnsetEnvReq:              unsetEnvHandler,
 		sliverpb.MsgExecuteTokenReq:          executeTokenHandler,
+		sliverpb.MsgGetPrivsReq:              getPrivsHandler,
 
 		// Platform specific
 		sliverpb.MsgIfconfigReq:          ifconfigHandler,
@@ -493,3 +494,47 @@ func regCreateKeyHandler(data []byte, resp RPCResponse) {
 	data, err = proto.Marshal(createResp)
 	resp(data, err)
 }
+
+func getPrivsHandler(data []byte, resp RPCResponse) {
+	createReq := &sliverpb.GetPrivsReq{}
+
+	err := proto.Unmarshal(data, createReq)
+	if err != nil {
+		return
+	}
+
+	privsInfo, err := priv.GetPrivs()
+
+	response_data := make([]*sliverpb.WindowsPrivilegeEntry, len(privsInfo))
+
+	/*
+		Translate the PrivilegeInfo structs into
+		sliverpb.WindowsPrivilegeEntry structs and put them in the data
+		that will go back to the server / client
+	*/
+	for index, entry := range privsInfo {
+		var currentEntry sliverpb.WindowsPrivilegeEntry
+
+		currentEntry.Name = entry.Name
+		currentEntry.Description = entry.Description
+		currentEntry.Enabled = entry.Enabled
+		currentEntry.EnabledByDefault = entry.EnabledByDefault
+		currentEntry.Removed = entry.Removed
+		currentEntry.UsedForAccess = entry.UsedForAccess
+
+		response_data[index] = &currentEntry
+	}
+
+	// Package up the response
+	getPrivsResp := &sliverpb.GetPrivs{
+		PrivInfo: response_data,
+		Response: &commonpb.Response{},
+	}
+
+	if err != nil {
+		getPrivsResp.Response.Err = err.Error()
+	}
+
+	data, err = proto.Marshal(getPrivsResp)
+	resp(data, err)
+}

implant/sliver/priv/priv_windows.go

@@ -26,6 +26,8 @@ import (
 	"log"
 
 	// {{end}}
+	"bytes"
+	"encoding/binary"
 	"fmt"
 	"os/exec"
 	"runtime"
@@ -43,6 +45,15 @@ const (
 	THREAD_ALL_ACCESS = windows.STANDARD_RIGHTS_REQUIRED | windows.SYNCHRONIZE | 0xffff
 )
 
+type PrivilegeInfo struct {
+	Name             string
+	Description      string
+	Enabled          bool
+	EnabledByDefault bool
+	Removed          bool
+	UsedForAccess    bool
+}
+
 var CurrentToken windows.Token
 
 func SePrivEnable(s string) error {
@@ -328,3 +339,163 @@ func GetSystem(data []byte, hostingProcess string) (err error) {
 	}
 	return
 }
+
+func lookupPrivilegeNameByLUID(luid uint64) (string, string, error) {
+	/*
+	   We will need the LookupPrivilegeNameW and LookupPrivilegeDisplayNameW functions
+	   https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-lookupprivilegenamew
+	   https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-lookupprivilegedisplaynamew
+
+	   Defined these syscalls in implant/sliver/syscalls/syscalls_windows.go and generated them with
+	   mkwinsyscall, so we are good to go.
+	*/
+
+	// Allocate 256 wide unicode characters (uint16) for the both names (255 characters plus a null terminator)
+	nameBuffer := make([]uint16, 256)
+	nameBufferSize := uint32(len(nameBuffer))
+	displayNameBuffer := make([]uint16, 256)
+	displayNameBufferSize := uint32(len(displayNameBuffer))
+
+	// A blank string for the system name tells the call to use the local machine
+	systemName := ""
+
+	/*
+	  A language ID that gets returned from LookupPrivilegeDisplayNameW
+	  We do not need it for anything, but we still need to provide it
+	*/
+	var langID uint32
+
+	err := syscalls.LookupPrivilegeNameW(systemName, &luid, &nameBuffer[0], &nameBufferSize)
+
+	if err != nil {
+		return "", "", err
+	}
+
+	err = syscalls.LookupPrivilegeDisplayNameW(systemName, &nameBuffer[0], &displayNameBuffer[0], &displayNameBufferSize, &langID)
+
+	if err != nil {
+		// We already got the privilege name, so we might as well return that
+		return syscall.UTF16ToString(nameBuffer), "", err
+	}
+
+	return syscall.UTF16ToString(nameBuffer), syscall.UTF16ToString(displayNameBuffer), nil
+}
+
+func GetPrivs() ([]PrivilegeInfo, error) {
+	// A place to store the process token
+	var tokenHandle syscall.Token
+
+	// A place to put the size of the token information
+	var tokenInfoBufferSize uint32
+
+	// Get a handle for the current process
+	currentProcHandle, err := syscall.GetCurrentProcess()
+
+	if err != nil {
+		// {{if .Config.Debug}}
+		log.Println("Could not get a handle for the current process: ", err)
+		// {{end}}
+		return nil, err
+	}
+
+	// Get the process token from the current process
+	err = syscall.OpenProcessToken(currentProcHandle, syscall.TOKEN_QUERY, &tokenHandle)
+
+	if err != nil {
+		// {{if .Config.Debug}}
+		log.Println("Could not open process token: ", err)
+		// {{end}}
+		return nil, err
+	}
+
+	// Get the size of the token information buffer so we know how large of a buffer to allocate
+	// This produces an error about a data area passed to the syscall being too small, but
+	// we do not care about that because we just want to know how big of a buffer to make
+	syscall.GetTokenInformation(tokenHandle, syscall.TokenPrivileges, nil, 0, &tokenInfoBufferSize)
+
+	// Make the buffer and get token information
+	// Using a bytes Buffer so that we can Read from it later
+	tokenInfoBuffer := bytes.NewBuffer(make([]byte, tokenInfoBufferSize))
+
+	err = syscall.GetTokenInformation(tokenHandle,
+		syscall.TokenPrivileges,
+		&tokenInfoBuffer.Bytes()[0],
+		uint32(tokenInfoBuffer.Len()),
+		&tokenInfoBufferSize,
+	)
+
+	if err != nil {
+		// {{if .Config.Debug}}
+		log.Println("Error in call to GetTokenInformation: ", err)
+		// {{end}}
+		return nil, err
+	}
+
+	// The first 32 bits is the number of privileges in the structure
+	var privilegeCount uint32
+	err = binary.Read(tokenInfoBuffer, binary.LittleEndian, &privilegeCount)
+
+	if err != nil {
+		// {{if .Config.Debug}}
+		log.Println("Could not read the number of privileges from the token information.")
+		// {{end}}
+		return nil, err
+	}
+
+	/*
+		The remaining bytes contain the privileges themselves
+		LUID_AND_ATTRIBUTES Privileges[ANYSIZE_ARRAY]
+		Structure of the array: https://docs.microsoft.com/en-us/windows/win32/api/winnt/ns-winnt-luid_and_attributes
+	*/
+
+	privInfo := make([]PrivilegeInfo, int(privilegeCount))
+
+	for index := 0; index < int(privilegeCount); index++ {
+		// Iterate over the privileges and make sense of them
+		// In case of errors, return what we have so far and the error
+
+		// LUIDs consist of a DWORD and a LONG
+		var luid uint64
+
+		// Attributes are up to 32 one bit flags, so a uint32 is good for that
+		var attributes uint32
+
+		var currentPrivInfo PrivilegeInfo
+
+		// Read the LUID
+		err = binary.Read(tokenInfoBuffer, binary.LittleEndian, &luid)
+		if err != nil {
+			// {{if .Config.Debug}}
+			log.Println("Could not read the LUID from the binary stream: ", err)
+			// {{end}}
+			return privInfo, err
+		}
+
+		// Read the attributes
+		err = binary.Read(tokenInfoBuffer, binary.LittleEndian, &attributes)
+		if err != nil {
+			// {{if .Config.Debug}}
+			log.Println("Could not read the attributes from the binary stream: ", err)
+			// {{end}}
+			return privInfo, err
+		}
+
+		currentPrivInfo.Name, currentPrivInfo.Description, err = lookupPrivilegeNameByLUID(luid)
+		if err != nil {
+			// {{if .Config.Debug}}
+			log.Println("Could not get privilege info based on the LUID: ", err)
+			// {{end}}
+			return privInfo, err
+		}
+
+		// Figure out the attributes
+		currentPrivInfo.EnabledByDefault = (attributes & windows.SE_PRIVILEGE_ENABLED_BY_DEFAULT) > 0
+		currentPrivInfo.UsedForAccess = (attributes & windows.SE_PRIVILEGE_USED_FOR_ACCESS) > 0
+		currentPrivInfo.Enabled = (attributes & windows.SE_PRIVILEGE_ENABLED) > 0
+		currentPrivInfo.Removed = (attributes & windows.SE_PRIVILEGE_REMOVED) > 0
+
+		privInfo[index] = currentPrivInfo
+	}
+
+	return privInfo, nil
+}

implant/sliver/syscalls/syscalls_windows.go

@@ -35,3 +35,5 @@ package syscalls
 //sys SelectObject(hdc windows.Handle, h windows.Handle) (HGDIOBJ windows.Handle, err error) = Gdi32.SelectObject
 //sys BitBlt(hdc windows.Handle, x uint32, y uint32, cx uint32, cy uint32, hdcSrc windows.Handle, x1 uint32, y1 uint32, rop int32) (BOOL int, err error) = Gdi32.BitBlt
 //sys GetDIBits(hdc windows.Handle, hbm windows.Handle, start uint32, cLines uint32, lpvBits uintptr, lpbmi uintptr, usage int) (ret int, err error) = Gdi32.GetDIBits
+//sys LookupPrivilegeNameW(systemName string, luid *uint64, buffer *uint16, size *uint32) (err error) = advapi32.LookupPrivilegeNameW
+//sys LookupPrivilegeDisplayNameW(systemName string, privilegeName *uint16, buffer *uint16, size *uint32, languageId *uint32) (err error) = advapi32.LookupPrivilegeDisplayNameW