forked from KolibriOS/kolibrios
153 lines
4.1 KiB
PHP
153 lines
4.1 KiB
PHP
|
; ssh_transport.inc - SSH transport layer
|
||
|
|
;
|
||
|
|
; Copyright (C) 2016 Jeffrey Amelynck
|
||
|
|
;
|
||
|
|
; 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/>.
|
||
|
|
|
||
|
|
struct ssh_header
|
||
|
|
length dd ?
|
||
|
|
padding db ?
|
||
|
|
message_code db ?
|
||
|
|
ends
|
||
|
|
|
||
|
|
proc dummy_encrypt _key, _in, _out
|
||
|
|
|
||
|
|
ret
|
||
|
|
endp
|
||
|
|
|
||
|
|
proc ssh_recv_packet sock, buf, size, flags
|
||
|
|
|
||
|
|
locals
|
||
|
|
bufferptr dd ?
|
||
|
|
remaining dd ?
|
||
|
|
padding dd ?
|
||
|
|
endl
|
||
|
|
|
||
|
|
DEBUGF 1, "ssh_recv_packet\n"
|
||
|
|
; Receive first block (Read length, padding length, message code)
|
||
|
|
mcall recv, [sock], [buf], [rx_blocksize], [flags]
|
||
|
|
DEBUGF 1, "chunk = %u\n", eax
|
||
|
|
cmp eax, [rx_blocksize]
|
||
|
|
jne .fail ;;;;
|
||
|
|
|
||
|
|
; stdcall [decrypt_proc], [rx_context], [buf], [buf]
|
||
|
|
|
||
|
|
mov ebx, [buf]
|
||
|
|
movzx eax, [ebx+ssh_header.padding]
|
||
|
|
mov [padding], eax
|
||
|
|
mov eax, [ebx+ssh_header.length]
|
||
|
|
bswap eax ; length to little endian
|
||
|
|
mov [ebx+ssh_header.length], eax
|
||
|
|
DEBUGF 1, "ssh_recv_packet length = %u\n", eax
|
||
|
|
|
||
|
|
cmp eax, [size]
|
||
|
|
ja .fail ;;;;
|
||
|
|
|
||
|
|
sub eax, [rx_blocksize]
|
||
|
|
add eax, 4
|
||
|
|
mov [remaining], eax
|
||
|
|
add ebx, [rx_blocksize]
|
||
|
|
mov [bufferptr], ebx
|
||
|
|
.receive_loop:
|
||
|
|
mcall recv, [sock], [bufferptr], [remaining], 0
|
||
|
|
DEBUGF 1, "chunk = %u\n", eax
|
||
|
|
cmp eax, 0
|
||
|
|
jbe .fail
|
||
|
|
add [bufferptr], eax
|
||
|
|
sub [remaining], eax
|
||
|
|
ja .receive_loop
|
||
|
|
|
||
|
|
; .decrypt_loop:
|
||
|
|
; stdcall [decrypt_proc], [rx_context], [buf], [buf]
|
||
|
|
; ja .decrypt_loop
|
||
|
|
|
||
|
|
; .hmac_loop:
|
||
|
|
; TODO
|
||
|
|
; ja .hmac_loop
|
||
|
|
|
||
|
|
; Return usefull data length in eax
|
||
|
|
mov eax, [buf]
|
||
|
|
movzx ebx, [eax+ssh_header.padding]
|
||
|
|
mov eax, [eax+ssh_header.length]
|
||
|
|
sub eax, ebx
|
||
|
|
DEBUGF 1, "ssh_recv_packet complete, usefull data length=%u\n", eax
|
||
|
|
ret
|
||
|
|
|
||
|
|
.fail:
|
||
|
|
DEBUGF 1, "ssh_recv_packet failed!\n"
|
||
|
|
mov eax, -1
|
||
|
|
ret
|
||
|
|
|
||
|
|
endp
|
||
|
|
|
||
|
|
|
||
|
|
proc ssh_send_packet sock, buf, payloadsize, flags
|
||
|
|
|
||
|
|
locals
|
||
|
|
size dd ?
|
||
|
|
endl
|
||
|
|
DEBUGF 1, "ssh_send_packet: size=%u\n", [payloadsize]
|
||
|
|
|
||
|
|
mov eax, [payloadsize]
|
||
|
|
inc eax ; padding length byte
|
||
|
|
|
||
|
|
lea edx, [eax+4] ; total packet size (without padding)
|
||
|
|
mov [size], edx
|
||
|
|
mov ebx, [tx_blocksize]
|
||
|
|
dec ebx
|
||
|
|
and edx, ebx
|
||
|
|
neg edx
|
||
|
|
add edx, [tx_blocksize]
|
||
|
|
cmp edx, 4 ; minimum padding size
|
||
|
|
jae @f
|
||
|
|
add edx, [tx_blocksize]
|
||
|
|
@@:
|
||
|
|
DEBUGF 1, "Padding %u bytes\n", edx
|
||
|
|
add [size], edx
|
||
|
|
|
||
|
|
add eax, edx
|
||
|
|
DEBUGF 1, "Total size: %u\n", eax
|
||
|
|
bswap eax
|
||
|
|
mov edi, tx_buffer
|
||
|
|
stosd
|
||
|
|
mov al, dl
|
||
|
|
stosb
|
||
|
|
mov esi, [buf]
|
||
|
|
; cmp esi, edi
|
||
|
|
; je @f
|
||
|
|
mov ecx, [payloadsize]
|
||
|
|
rep movsb
|
||
|
|
; @@:
|
||
|
|
|
||
|
|
mov ebx, edx
|
||
|
|
mov esi, edx
|
||
|
|
and ebx, 3
|
||
|
|
jz @f
|
||
|
|
call MBRandom
|
||
|
|
mov dword[edi], eax
|
||
|
|
add edi, ebx
|
||
|
|
@@:
|
||
|
|
|
||
|
|
shr esi, 2
|
||
|
|
@@:
|
||
|
|
call MBRandom
|
||
|
|
stosd
|
||
|
|
dec esi
|
||
|
|
jnz @r
|
||
|
|
|
||
|
|
mcall send, [sock], tx_buffer, [size], [flags]
|
||
|
|
|
||
|
|
ret
|
||
|
|
|
||
|
|
endp
|