package generate

/*
	This is port of SRDI by Leo Loobeek, that we've made a few modifications to

	Originals:
	https://gist.github.com/leoloobeek/c726719d25d7e7953d4121bd93dd2ed3
	https://silentbreaksecurity.com/srdi-shellcode-reflective-dll-injection/


	***********************************************************************************************
	PIC_BindShell primitives and related works are released under the license below.
	***********************************************************************************************

	Copyright (c) 2013, Matthew Graeber
	All rights reserved.

	Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

		Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
		Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
		The names of its contributors may not be used to endorse or promote products derived from this software without specific prior written permission.

	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


	***********************************************************************************************
	Reflective DLL Injection primitives and related works are released under the license below.
	***********************************************************************************************

	Copyright (c) 2015, Dan Staples

	Copyright (c) 2011, Stephen Fewer of Harmony Security (www.harmonysecurity.com)
	All rights reserved.

	Redistribution and use in source and binary forms, with or without modification, are permitted
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		* Redistributions of source code must retain the above copyright notice, this list of
	conditions and the following disclaimer.

		* Redistributions in binary form must reproduce the above copyright notice, this list of
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		* Neither the name of Harmony Security nor the names of its contributors may be used to
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	OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	POSSIBILITY OF SUCH DAMAGE.

	***********************************************************************************************
	All other works under this project are licensed under GNU GPLv3
	***********************************************************************************************


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	Program specifies that a certain numbered version of the GNU General
	Public License "or any later version" applies to it, you have the
	option of following the terms and conditions either of that numbered
	version or of any later version published by the Free Software
	Foundation.  If the Program does not specify a version number of the
	GNU General Public License, you may choose any version ever published
	by the Free Software Foundation.

	If the Program specifies that a proxy can decide which future
	versions of the GNU General Public License can be used, that proxy's
	public statement of acceptance of a version permanently authorizes you
	to choose that version for the Program.

	Later license versions may give you additional or different
	permissions.  However, no additional obligations are imposed on any
	author or copyright holder as a result of your choosing to follow a
	later version.

	15. Disclaimer of Warranty.

	THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
	APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
	HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
	OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
	THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
	IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
	ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

	16. Limitation of Liability.

	IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
	WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
	THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
	GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
	USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
	DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
	PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
	EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
	SUCH DAMAGES.

	17. Interpretation of Sections 15 and 16.

	If the disclaimer of warranty and limitation of liability provided
	above cannot be given local legal effect according to their terms,
	reviewing courts shall apply local law that most closely approximates
	an absolute waiver of all civil liability in connection with the
	Program, unless a warranty or assumption of liability accompanies a
	copy of the Program in return for a fee.

						END OF TERMS AND CONDITIONS

				How to Apply These Terms to Your New Programs

	If you develop a new program, and you want it to be of the greatest
	possible use to the public, the best way to achieve this is to make it
	free software which everyone can redistribute and change under these terms.

	To do so, attach the following notices to the program.  It is safest
	to attach them to the start of each source file to most effectively
	state the exclusion of warranty; and each file should have at least
	the "copyright" line and a pointer to where the full notice is found.

		{one line to give the program's name and a brief idea of what it does.}
		Copyright (C) {year}  {name of author}

		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 <http://www.gnu.org/licenses/>.

	Also add information on how to contact you by electronic and paper mail.

	If the program does terminal interaction, make it output a short
	notice like this when it starts in an interactive mode:

		{project}  Copyright (C) {year}  {fullname}
		This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
		This is free software, and you are welcome to redistribute it
		under certain conditions; type `show c' for details.

	The hypothetical commands `show w' and `show c' should show the appropriate
	parts of the General Public License.  Of course, your program's commands
	might be different; for a GUI interface, you would use an "about box".

	You should also get your employer (if you work as a programmer) or school,
	if any, to sign a "copyright disclaimer" for the program, if necessary.
	For more information on this, and how to apply and follow the GNU GPL, see
	<http://www.gnu.org/licenses/>.

	The GNU General Public License does not permit incorporating your program
	into proprietary programs.  If your program is a subroutine library, you
	may consider it more useful to permit linking proprietary applications with
	the library.  If this is what you want to do, use the GNU Lesser General
	Public License instead of this License.  But first, please read
	<http://www.gnu.org/philosophy/why-not-lgpl.html>.


*/

import (
	"encoding/binary"
	"math"
	"os"
	"path"
	"path/filepath"
	"strings"
)

// ShellcodeRDIToFile generates a sRDI shellcode and writes it to a file
func ShellcodeRDIToFile(dllPath string, functionName string) (shellcodePath string, err error) {
	shellcode, err := ShellcodeRDI(dllPath, functionName, "")
	if err != nil {
		return "", err
	}
	dir := filepath.Dir(dllPath)
	filename := strings.Replace(path.Base(dllPath), ".dll", ".bin", 1)
	filePath := filepath.Join(dir, filename)
	os.WriteFile(filePath, shellcode, 0700)
	return filePath, nil
}

// ShellcodeRDI generates a reflective shellcode based on a DLL file
func ShellcodeRDI(dllPath string, functionName string, userdata string) (shellcode []byte, err error) {
	// handle command line arguments, -h or -help shows the menu
	userDataStr := userdata
	clearHeader := true

	dllBytes, err := os.ReadFile(dllPath)
	if err != nil {
		return []byte{}, err
	}

	// functionHash is 0x10 by default, otherwise get the hash and convert to bytes
	var hashFunction []byte
	if functionName != "" {
		hashFunctionUint32 := hashFunctionName(functionName)
		hashFunction = pack(hashFunctionUint32)
	} else {
		hashFunction = pack(uint32(0x10))
	}

	flags := 0
	if clearHeader {
		flags |= 0x1
	}
	var userData []byte
	if userDataStr != "" {
		userData = []byte(userDataStr)
	}
	shellcode = convertToShellcode(dllBytes, hashFunction, userData, flags)
	//	err = os.RemoveAll(path.Clean(path.Dir(dllPath) + "/../"))
	return shellcode, nil

}

// ShellcodeRDIFromBytes generate a sRDI from a byte array
func ShellcodeRDIFromBytes(data []byte, functionName string, arguments string) (shellcode []byte, err error) {

	clearHeader := true
	userDataStr := arguments

	// functionHash is 0x10 by default, otherwise get the hash and convert to bytes
	var hashFunction []byte
	if functionName != "" {
		hashFunctionUint32 := hashFunctionName(functionName)
		hashFunction = pack(hashFunctionUint32)
	} else {
		hashFunction = pack(uint32(0x10))
	}

	flags := 0
	if clearHeader {
		flags |= 0x1
	}
	var userData []byte
	if userDataStr != "" {
		userData = []byte(userDataStr)
	}
	shellcode = convertToShellcode(data, hashFunction, userData, flags)
	return shellcode, nil
}

func convertToShellcode(dllBytes, functionHash, userData []byte, flags int) []byte {

	if userData == nil {
		userData = []byte("None")
	}

	var final []byte

	if is64BitDLL(dllBytes) {
		// do 64 bit things

		bootstrapSize := 64

		// call next instruction (Pushes next instruction address to stack)
		bootstrap := []byte{0xe8, 0x00, 0x00, 0x00, 0x00}

		// Set the offset to our DLL from pop result
		dllOffset := bootstrapSize - len(bootstrap) + len(rdiShellcode64)

		// pop rcx - Capture our current location in memory
		bootstrap = append(bootstrap, 0x59)

		// mov r8, rcx - copy our location in memory to r8 before we start modifying RCX
		bootstrap = append(bootstrap, 0x49, 0x89, 0xc8)

		// add rcx, <Offset of the DLL>
		bootstrap = append(bootstrap, 0x48, 0x81, 0xc1)

		bootstrap = append(bootstrap, pack(uint32(dllOffset))...)

		// mov edx, <Hash of function>
		bootstrap = append(bootstrap, 0xba)
		bootstrap = append(bootstrap, functionHash...)

		// Setup the location of our user data
		// add r8, <Offset of the DLL> + <Length of DLL>
		bootstrap = append(bootstrap, 0x49, 0x81, 0xc0)
		userDataLocation := dllOffset + len(dllBytes)
		bootstrap = append(bootstrap, pack(uint32(userDataLocation))...)

		// mov r9d, <Length of User Data>
		bootstrap = append(bootstrap, 0x41, 0xb9)
		bootstrap = append(bootstrap, pack(uint32(len(userData)))...)

		// push rsi - save original value
		bootstrap = append(bootstrap, 0x56)

		// mov rsi, rsp - store our current stack pointer for later
		bootstrap = append(bootstrap, 0x48, 0x89, 0xe6)

		// and rsp, 0x0FFFFFFFFFFFFFFF0 - Align the stack to 16 bytes
		bootstrap = append(bootstrap, 0x48, 0x83, 0xe4, 0xf0)

		// sub rsp, 0x30 - Create some breathing room on the stack
		bootstrap = append(bootstrap, 0x48, 0x83, 0xec)
		bootstrap = append(bootstrap, 0x30) // 32 bytes for shadow space + 8 bytes for last arg + 8 bytes for stack alignment

		// mov dword ptr [rsp + 0x20], <Flags> - Push arg 5 just above shadow space
		bootstrap = append(bootstrap, 0xC7, 0x44, 0x24)
		bootstrap = append(bootstrap, 0x20)
		bootstrap = append(bootstrap, pack(uint32(flags))...)

		// call - Transfer execution to the RDI
		bootstrap = append(bootstrap, 0xe8)
		bootstrap = append(bootstrap, byte(bootstrapSize-len(bootstrap)-4)) // Skip over the remainder of instructions
		bootstrap = append(bootstrap, 0x00, 0x00, 0x00)

		// mov rsp, rsi - Reset our original stack pointer
		bootstrap = append(bootstrap, 0x48, 0x89, 0xf4)

		// pop rsi - Put things back where we left them
		bootstrap = append(bootstrap, 0x5e)

		// ret - return to caller
		bootstrap = append(bootstrap, 0xc3)

		final = append(bootstrap, rdiShellcode64...)
		final = append(final, dllBytes...)
		final = append(final, userData...)

	} else {
		// do 32 bit things

		bootstrapSize := 45

		// call next instruction (Pushes next instruction address to stack)
		bootstrap := []byte{0xe8, 0x00, 0x00, 0x00, 0x00}

		// Set the offset to our DLL from pop result
		dllOffset := bootstrapSize - len(bootstrap) + len(rdiShellcode32)

		// pop eax - Capture our current location in memory
		bootstrap = append(bootstrap, 0x58)

		// mov ebx, eax - copy our location in memory to ebx before we start modifying eax
		bootstrap = append(bootstrap, 0x89, 0xc3)

		// add eax, <Offset to the DLL>
		bootstrap = append(bootstrap, 0x05)
		bootstrap = append(bootstrap, pack(uint32(dllOffset))...)

		// add ebx, <Offset to the DLL> + <Size of DLL>
		bootstrap = append(bootstrap, 0x81, 0xc3)
		userDataLocation := dllOffset + len(dllBytes)
		bootstrap = append(bootstrap, pack(uint32(userDataLocation))...)

		// push <Flags>
		bootstrap = append(bootstrap, 0x68)
		bootstrap = append(bootstrap, pack(uint32(flags))...)

		// push <Length of User Data>
		bootstrap = append(bootstrap, 0x68)
		bootstrap = append(bootstrap, pack(uint32(len(userData)))...)

		// push ebx
		bootstrap = append(bootstrap, 0x53)

		// push <hash of function>
		bootstrap = append(bootstrap, 0x68)
		bootstrap = append(bootstrap, functionHash...)

		// push eax
		bootstrap = append(bootstrap, 0x50)

		// call - Transfer execution to the RDI
		bootstrap = append(bootstrap, 0xe8)
		bootstrap = append(bootstrap, byte(bootstrapSize-len(bootstrap)-4)) // Skip over the remainder of instructions
		bootstrap = append(bootstrap, 0x00, 0x00, 0x00)

		// add esp, 0x14 - correct the stack pointer
		bootstrap = append(bootstrap, 0x83, 0xc4, 0x14)

		// ret - return to caller
		bootstrap = append(bootstrap, 0xc3)

		final = append(bootstrap, rdiShellcode32...)
		final = append(final, dllBytes...)
		final = append(final, userData...)
	}

	return final

}

// helper function similar to struct.pack from python3
func pack(val uint32) []byte {
	bytes := make([]byte, 4)
	binary.LittleEndian.PutUint32(bytes, val)
	return bytes
}

// "HelloWorld" = 3571859646
func hashFunctionName(name string) uint32 {
	function := []byte(name)
	function = append(function, 0x00)

	functionHash := uint32(0)

	for _, b := range function {
		functionHash = ror(functionHash, 13, 32)
		functionHash += uint32(b)
	}

	return functionHash
}

// ROR-13 implementation
func ror(val uint32, rBits uint32, maxBits uint32) uint32 {
	exp := uint32(math.Exp2(float64(maxBits))) - 1
	return ((val & exp) >> (rBits % maxBits)) | (val << (maxBits - (rBits % maxBits)) & exp)
}

func is64BitDLL(dllBytes []byte) bool {
	machineIA64 := uint16(512)
	machineAMD64 := uint16(34404)

	headerOffset := binary.LittleEndian.Uint32(dllBytes[60:64])
	machine := binary.LittleEndian.Uint16(dllBytes[headerOffset+4 : headerOffset+4+2])

	// 64 bit
	if machine == machineIA64 || machine == machineAMD64 {
		return true
	}
	return false
}
