191 lines
5.1 KiB
NASM
191 lines
5.1 KiB
NASM
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2016. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;; rshell.asm - Simple reverse shell for KolibriOS ;;
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;; ;;
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;; Written by hidnplayr@kolibrios.org ;;
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;; ;;
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;; GNU GENERAL PUBLIC LICENSE ;;
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;; Version 2, June 1991 ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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format binary as ""
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BUFFERSIZE = 1500
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use32
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; standard header
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db 'MENUET01' ; signature
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dd 1 ; header version
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dd start ; entry point
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dd i_end ; initialized size
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dd mem ; required memory
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dd mem ; stack pointer
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dd 0 ; parameters
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dd 0 ; path
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include '../../macros.inc'
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purge mov,add,sub
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include '../../proc32.inc'
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include '../../dll.inc'
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include '../../network.inc'
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; entry point
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start:
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; load libraries
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stdcall dll.Load, @IMPORT
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test eax, eax
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jnz exit
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; initialize console
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invoke con_start, 1
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invoke con_init, 80, 25, 80, 25, title
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mcall 40, EVM_STACK
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invoke con_write_asciiz, str1
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mcall socket, AF_INET4, SOCK_STREAM, 0
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cmp eax, -1
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je sock_err
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mov [socketnum], eax
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; This socket option is not implemented in kernel yet.
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; mcall setsockopt, [socketnum], SOL_SOCKET, SO_REUSEADDR, &yes,
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; cmp eax, -1
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; je opt_err
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mcall bind, [socketnum], sockaddr1, sockaddr1.length
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cmp eax, -1
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je bind_err
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mcall listen, [socketnum], 10 ; Backlog = 10
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cmp eax, -1
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je listen_err
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invoke con_write_asciiz, str2
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mcall accept, [socketnum], sockaddr1, sockaddr1.length
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cmp eax, -1
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je acpt_err
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mov [socketnum2], eax
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mcall 18, 7
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push eax
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mcall 51, 1, thread, mem - 2048
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pop ecx
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mcall 18, 3
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.loop:
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mcall recv, [socketnum2], buffer, buffer.length, 0
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cmp eax, -1
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je .loop
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mov byte[buffer+eax], 0
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invoke con_write_asciiz, buffer
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jmp .loop
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acpt_err:
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invoke con_write_asciiz, str8
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jmp done
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listen_err:
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invoke con_write_asciiz, str3
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jmp done
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bind_err:
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invoke con_write_asciiz, str4
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jmp done
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sock_err:
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invoke con_write_asciiz, str6
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jmp done
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done:
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invoke con_getch2 ; Wait for user input
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invoke con_exit, 1
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exit:
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cmp [socketnum], 0
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je @f
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mcall close, [socketnum]
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@@:
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cmp [socketnum2], 0
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je @f
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mcall close, [socketnum2]
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@@:
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mcall -1
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thread:
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mcall 40, 0
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.loop:
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invoke con_getch2
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mov [send_data], ax
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xor esi, esi
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inc esi
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test al, al
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jnz @f
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inc esi
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@@:
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mcall send, [socketnum2], send_data
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invoke con_get_flags
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test eax, 0x200 ; con window closed?
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jz .loop
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mcall -1
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; data
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title db 'Reverse shell',0
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str1 db 'Opening socket',10, 0
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str2 db 'Listening for incoming connections...',10,0
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str3 db 'Listen error',10,10,0
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str4 db 'Bind error',10,10,0
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str5 db 'Setsockopt error',10,10,0
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str6 db 'Could not open socket',10,10,0
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str8 db 'Error accepting connection',10,10,0
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sockaddr1:
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dw AF_INET4
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.port dw 23 shl 8 ; port 23 - network byte order
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.ip dd 0
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rb 10
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.length = $ - sockaddr1
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; import
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align 4
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@IMPORT:
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library console, 'console.obj'
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import console, \
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con_start, 'START', \
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con_init, 'con_init', \
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con_write_asciiz, 'con_write_asciiz', \
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con_exit, 'con_exit', \
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con_gets, 'con_gets',\
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con_cls, 'con_cls',\
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con_printf, 'con_printf',\
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con_getch2, 'con_getch2',\
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con_set_cursor_pos, 'con_set_cursor_pos',\
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con_get_flags, 'con_get_flags'
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i_end:
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socketnum dd ?
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socketnum2 dd ?
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buffer rb BUFFERSIZE
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.length = BUFFERSIZE
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send_data dw ?
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align 4
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rb 4096 ; stack
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mem:
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