655 lines
18 KiB
NASM
655 lines
18 KiB
NASM
; ssh.asm - SSH client for KolibriOS
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;
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; Copyright (C) 2015-2021 Jeffrey Amelynck
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <http://www.gnu.org/licenses/>.
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format binary as ""
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__DEBUG__ = 1
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__DEBUG_LEVEL__ = 2 ; 1: Everything, including sensitive information, 2: Debugging, 3: Errors only
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BUFFERSIZE = 64*1024 ; Must be at least 32K according rfc4253#section-6.1
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PACKETSIZE = 32*1024 ; Must be at least 32K according rfc4253#section-6.1
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MAX_BITS = 8192
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DH_PRIVATE_KEY_SIZE = 256
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MAX_INPUT_LENGTH = 255
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MAX_USERNAME_LENGTH = 256
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MAX_PASSWORD_LENGTH = 256
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MAX_HOSTNAME_LENGTH = 4096
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MAX_PUBLIC_KEY_SIZE = 4096
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use32
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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+65536 ; required memory
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dd mem+65536 ; stack pointer
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dd params ; parameters
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dd 0 ; path
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include '../../macros.inc'
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;include '../../struct.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 '../../debug-fdo.inc'
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include '../../network.inc'
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include '../../develop/libraries/libcrash/trunk/libcrash.inc'
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; macros for network byte order
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macro dd_n op {
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dd 0 or (((op) and 0FF000000h) shr 24) or \
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(((op) and 000FF0000h) shr 8) or \
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(((op) and 00000FF00h) shl 8) or \
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(((op) and 0000000FFh) shl 24)
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}
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macro dw_n op {
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dw 0 or (((op) and 0FF00h) shr 8) or \
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(((op) and 000FFh) shl 8)
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}
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macro str string {
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local .start, .stop
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dd_n (.stop-.start)
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.start db string
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.stop:
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}
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proc dump_hex _ptr, _length
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if __DEBUG_LEVEL__ <= 1
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pushad
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mov esi, [_ptr]
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mov ecx, [_length]
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.next_dword:
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lodsd
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bswap eax
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DEBUGF 1,'%x', eax
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loop .next_dword
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DEBUGF 1,'\n'
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popad
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end if
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ret
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endp
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macro DEBUGM l, s, m {
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if __DEBUG__
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DEBUGF l, s
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if l >=__DEBUG_LEVEL__
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stdcall mpint_print, m
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end if
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end if
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}
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include 'mpint.inc'
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include 'seed.inc'
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include 'random.inc'
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include 'aes256.inc'
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include 'aes256-ctr.inc'
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include 'aes256-cbc.inc'
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include 'blowfish.inc'
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include 'blowfish-ctr.inc'
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include 'blowfish-cbc.inc'
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include 'hmac_sha256.inc'
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include 'hmac_sha1.inc'
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include 'hmac_md5.inc'
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include 'sshlib.inc'
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include 'sshlib_mcodes.inc'
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include 'sshlib_transport.inc'
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include 'sshlib_connection.inc'
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include 'sshlib_dh_gex.inc'
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include 'sshlib_host.inc'
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include 'sshlib_channel.inc'
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include 'sshlib_userauth.inc'
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include 'encodings.inc' ; Unfortunately, we dont have UTF-8 capable console yet :(
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start:
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mcall 68, 11 ; Init heap
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DEBUGF 2, "SSH: Loading libraries\n"
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stdcall dll.Load, @IMPORT
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test eax, eax
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jnz main.fail
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DEBUGF 2, "SSH: Init PRNG\n"
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call create_seed
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call init_random
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DEBUGF 2, "SSH: Init Console\n"
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invoke con_start, 1
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invoke con_init, 80, 25, 80, 250, title
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cmp byte[params], 0
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jne main.connect
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main:
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invoke con_cls
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; Welcome user
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invoke con_write_asciiz, str1a
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.prompt:
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invoke con_write_asciiz, str1b
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; Reset window title
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invoke con_set_title, title
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; Write prompt
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invoke con_write_asciiz, str2
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; read string
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mov esi, params
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invoke con_gets, esi, MAX_HOSTNAME_LENGTH
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; check for exit
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test eax, eax
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jz .done
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cmp byte[esi], 10
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jz .done
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.connect:
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stdcall sshlib_connect, ssh_con, params
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cmp eax, 0
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jg .prompt
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jl .error
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.login:
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mcall 68, 12, (MAX_USERNAME_LENGTH + MAX_PASSWORD_LENGTH)
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test eax, eax
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jz .done ; ERR_NOMEM
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mov esi, eax
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lea edi, [eax + MAX_USERNAME_LENGTH]
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; Get username
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invoke con_write_asciiz, str12
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invoke con_gets, esi, MAX_USERNAME_LENGTH
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test eax, eax
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;; jz .con_closed_must_clear
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; Get password
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invoke con_write_asciiz, str13a
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invoke con_gets, edi, MAX_PASSWORD_LENGTH
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test eax, eax
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;; jz .con_closed_must_clear
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invoke con_write_asciiz, str13b
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; Authenticate
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stdcall sshlib_userauth_password, ssh_con, esi, edi
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; Clear and free username and password
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.clear:
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push eax
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mov edx, edi
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xor eax, eax
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mov ecx, (MAX_USERNAME_LENGTH + MAX_PASSWORD_LENGTH)/4
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rep stosd
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mcall 68, 13, edx
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pop eax
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cmp eax, 0
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jg .login ; Authentication failed
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jl .error ; An error occured
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; Open a channel
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stdcall sshlib_chan_open, ssh_con
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cmp eax, 0
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jg .prompt ; Authentication failed
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jl .error ; An error occured
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; Start console input handler thread without deactivating the current window
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; Get active window ID
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mcall 18, 7
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push eax
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; Create thread
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mcall 51, 1, con_in_thread, mem - 2048
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; Activate window with given ID
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pop ecx
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mcall 18, 3
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.loop:
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invoke con_get_flags
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test eax, 0x200 ; console window closed?
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jnz .con_closed
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stdcall sshlib_msg_handler, ssh_con, 0
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cmp eax, 0
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jle .check_err
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cmp [ssh_con.rx_buffer.message_code], SSH_MSG_CHANNEL_DATA
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jne .dump
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mov eax, dword[ssh_con.rx_buffer.message_code+5]
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bswap eax
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DEBUGF 1, 'SSH: got %u bytes of data !\n', eax
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lea esi, [ssh_con.rx_buffer.message_code+5+4]
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lea edx, [esi+eax]
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lea edi, [ssh_con.rx_buffer]
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@@:
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call get_byte_utf8
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stosb
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cmp esi, edx
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jb @r
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xor al, al
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stosb
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lea esi, [ssh_con.rx_buffer]
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DEBUGF 3, 'SSH msg: %s\n', esi
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invoke con_write_asciiz, esi
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jmp .loop
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.dump:
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DEBUGF 3, "SSH: Unsupported message: "
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lea esi, [ssh_con.rx_buffer.message_code]
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mov ecx, eax
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pusha
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@@:
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lodsb
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DEBUGF 3, "%x ", eax:2
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dec ecx
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jnz @r
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popa
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DEBUGF 3, "\n"
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jmp .loop
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.check_err:
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jz .err_conn_closed
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cmp ebx, EWOULDBLOCK
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je .loop
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jmp .err_sock
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.con_closed:
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; Send close message on the active channel
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stdcall sshlib_send_packet, ssh_con, ssh_msg_channel_close, ssh_msg_channel_close.length, 0
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jmp .done
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.error:
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; TODO: proper cleanup after error
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cmp eax, SSHLIB_ERR_NOMEM
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je .done
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cmp eax, SSHLIB_ERR_SOCKET
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je .err_sock
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cmp eax, SSHLIB_ERR_PROTOCOL
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je .err_proto
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cmp eax, SSHLIB_ERR_HOSTNAME
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je .err_hostname
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cmp eax, SSHLIB_ERR_HKEY_VERIFY_FAIL
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je .err_hostkey_fail
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cmp eax, SSHLIB_ERR_HKEY_SIGNATURE
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je .err_hostkey_signature
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cmp eax, SSHLIB_ERR_HKEY_PUBLIC_KEY
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je .err_hostkey
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jmp .done
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.err_proto:
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; lea eax, [ssh_con.rx_buffer]
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; int3
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invoke con_write_asciiz, str7
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jmp .prompt
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.err_sock:
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invoke con_write_asciiz, str6
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mov eax, str14
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cmp ebx, ETIMEDOUT
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je .err_sock_detail
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mov eax, str15
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cmp ebx, ECONNREFUSED
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je .err_sock_detail
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mov eax, str16
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cmp ebx, ECONNRESET
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je .err_sock_detail
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mov eax, str17
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.err_sock_detail:
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invoke con_write_asciiz, eax
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jmp .prompt
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.err_hostname:
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invoke con_write_asciiz, str10
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jmp .prompt
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.err_conn_closed:
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invoke con_write_asciiz, str11
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jmp .prompt
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.err_hostkey:
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invoke con_write_asciiz, str19
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jmp .prompt
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.err_hostkey_signature:
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invoke con_write_asciiz, str20
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jmp .prompt
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.err_hostkey_fail:
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invoke con_write_asciiz, str21
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jmp .prompt
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.done:
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invoke con_exit, 1
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.exit:
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DEBUGF 3, "SSH: Exiting\n"
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mcall close, [ssh_con.socketnum]
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.fail:
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mcall -1
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proc sshlib_callback_connecting, con_ptr, connstring_sz
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invoke con_write_asciiz, str3
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mov eax, [con_ptr]
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lea eax, [eax+sshlib_connection.hostname_sz]
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invoke con_write_asciiz, eax
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invoke con_write_asciiz, str8
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invoke con_write_asciiz, [connstring_sz]
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invoke con_write_asciiz, str9
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ret
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endp
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proc sshlib_callback_hostkey_problem, con_ptr, problem_type, hostkey_sz
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cmp [problem_type], SSHLIB_HOSTKEY_PROBLEM_UNKNOWN
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je .unknown
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cmp [problem_type], SSHLIB_HOSTKEY_PROBLEM_MISMATCH
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je .mismatch
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mov eax, -1
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ret
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.unknown:
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invoke con_write_asciiz, str22
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jmp .ask
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.mismatch:
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invoke con_write_asciiz, str23
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; jmp .ask
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.ask:
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invoke con_write_asciiz, str24a
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invoke con_write_asciiz, [hostkey_sz]
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invoke con_write_asciiz, str24b
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.getansw:
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invoke con_getch2
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or al, 0x20 ; convert to lowercase
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cmp al, 'a'
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je .accept
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cmp al, 'c'
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je .once
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cmp al, 'x'
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je .refuse
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jmp .getansw
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.accept:
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mov eax, SSHLIB_HOSTKEY_ACCEPT
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ret
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.once:
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mov eax, SSHLIB_HOSTKEY_ONCE
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ret
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.refuse:
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mov eax, SSHLIB_HOSTKEY_REFUSE
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ret
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endp
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align 16
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con_in_thread:
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.loop:
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; TODO: check if channel is still open somehow
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invoke con_get_input, keyb_input, MAX_INPUT_LENGTH
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test eax, eax
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jz .no_input
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mov ecx, eax
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mov esi, keyb_input
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mov edi, ssh_msg_channel_data.data
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call recode_to_utf8
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lea eax, [edi - ssh_msg_channel_data.data]
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lea ecx, [edi - ssh_msg_channel_data]
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bswap eax
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mov [ssh_msg_channel_data.len], eax
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stdcall sshlib_send_packet, ssh_con, ssh_msg_channel_data, ecx, 0
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cmp eax, 0
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jle .exit
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.no_input:
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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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.exit:
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mcall -1
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; data
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title db 'Secure Shell',0
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str1a db 'SSHv2 client for KolibriOS',10,0
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str1b db 10,'Please enter URL of SSH server (hostname:port)',10,0
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str2 db '> ',0
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str3 db 'Connecting to ',0
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str4 db 10,0
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str6 db 10, 27, '[2J',27,'[mA network error has occured.',10,0
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str7 db 10, 27, '[2J',27,'[mAn SSH protocol error has occured.',10,0
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str8 db ' (',0
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str9 db ')',10,0
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str10 db 'Host does not exist.',10,10,0
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str11 db 10, 27, '[2J',27,'[mThe remote host closed the connection.',10,0
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str12 db 'Login as: ',0
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str13a db 'Password: ', 27, '[?25l', 27, '[30;40m', 0
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str13b db 10, 27, '[?25h', 27, '[0m', 27, '[2J', 0
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str14 db 'The connection timed out',10,0
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str15 db 'The connection was refused',10,0
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str16 db 'The connection was reset',10,0
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str17 db 'No details available',10,0
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;str18 db 'User authentication failed',10,0;;;;
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str19 db "The remote host's public key is invalid.", 10, 0
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str20 db "The remote host's signature is invalid.", 10, 0
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str21 db "The remote host failed to verify it's own public key.", 10, 0
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str22 db "The host key for the server was not found in the cache.", 10
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db "There is no guarantee to the servers identity !",10, 0
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str23 db "The host key provided by the host does not match the cached one.", 10
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db "This may indicate that the remote server has been compromised!", 10, 0
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str24a db 10, "The remote host key is: ", 10, 0
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str24b db 10, 10, "If you trust this host, press A to accept and store the (new) key.", 10
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db "Press C to connect to the host but don't store the (new) key.", 10
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db "Press X to abort.", 10, 0
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ssh_ident_ha:
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dd_n (ssh_msg_ident.length-2)
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ssh_msg_ident:
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db "SSH-2.0-KolibriOS_SSH_0.09",13,10
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.length = $ - ssh_msg_ident
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ssh_msg_kex:
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db SSH_MSG_KEXINIT
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.cookie:
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rd 4
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.kex_algorithms:
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str "diffie-hellman-group-exchange-sha256" ; diffie-hellman-group-exchange-sha1
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.server_host_key_algorithms:
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str "rsa-sha2-512,rsa-sha2-256,ssh-rsa" ;,ssh-dss
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.encryption_algorithms_client_to_server:
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str "aes256-ctr" ;,aes256-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes192-ctr,aes192-cbc,aes128-ctr,aes128-cbc,blowfish-ctr,blowfish-cbc,3des-ctr,3des-cbc,arcfour256,arcfour128"
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.encryption_algorithms_server_to_client:
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str "aes256-ctr" ;,aes256-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes192-ctr,aes192-cbc,aes128-ctr,aes128-cbc,blowfish-ctr,blowfish-cbc,3des-ctr,3des-cbc,arcfour256,arcfour128"
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.mac_algorithms_client_to_server:
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str "hmac-sha2-256" ;,hmac-sha1,hmac-sha1-96,hmac-md5"
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.mac_algorithms_server_to_client:
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str "hmac-sha2-256" ;,hmac-sha1,hmac-sha1-96,hmac-md5"
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.compression_algorithms_client_to_server:
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str "none" ;,zlib"
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.compression_algorithms_server_to_client:
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str "none" ;,zlib"
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.languages_client_to_server:
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str ""
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.languages_server_to_client:
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str ""
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.first_kex_packet_follows:
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db 0
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.reserved:
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dd_n 0
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.length = $ - ssh_msg_kex
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ssh_msg_gex_req:
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db SSH_MSG_KEX_DH_GEX_REQUEST
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dd_n 4096/4 ; DH GEX min
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dd_n 4096/2 ; DH GEX number of bits
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dd_n 4096 ; DH GEX Max
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.length = $ - ssh_msg_gex_req
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ssh_msg_new_keys:
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db SSH_MSG_NEWKEYS
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.length = $ - ssh_msg_new_keys
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|
|
|
ssh_msg_request_service:
|
|
db SSH_MSG_SERVICE_REQUEST
|
|
str "ssh-userauth" ; Service name
|
|
.length = $ - ssh_msg_request_service
|
|
|
|
|
|
ssh_msg_channel_open:
|
|
db SSH_MSG_CHANNEL_OPEN
|
|
str "session"
|
|
dd_n 0 ; Sender channel
|
|
dd_n BUFFERSIZE ; Initial window size
|
|
dd_n PACKETSIZE ; maximum packet size
|
|
.length = $ - ssh_msg_channel_open
|
|
|
|
|
|
ssh_msg_channel_close:
|
|
db SSH_MSG_CHANNEL_CLOSE
|
|
dd_n 0 ; Sender channel
|
|
.length = $ - ssh_msg_channel_close
|
|
|
|
|
|
ssh_msg_channel_request:
|
|
db SSH_MSG_CHANNEL_REQUEST
|
|
dd_n 0 ; Recipient channel
|
|
str "pty-req"
|
|
db 1 ; Bool: want reply
|
|
str "xterm"
|
|
dd_n 80 ; terminal width (rows)
|
|
dd_n 25 ; terminal height (rows)
|
|
dd_n 80*8 ; terminal width (pixels)
|
|
dd_n 25*16 ; terminal height (pixels)
|
|
|
|
dd_n 0 ; list of supported opcodes
|
|
.length = $ - ssh_msg_channel_request
|
|
|
|
|
|
ssh_msg_shell_request:
|
|
db SSH_MSG_CHANNEL_REQUEST
|
|
dd_n 0 ; Recipient channel
|
|
str "shell"
|
|
db 1 ; Bool: want reply
|
|
.length = $ - ssh_msg_shell_request
|
|
|
|
|
|
ssh_msg_channel_data:
|
|
db SSH_MSG_CHANNEL_DATA
|
|
dd_n 0 ; Sender channel
|
|
.len dd ?
|
|
.data rb 4*MAX_INPUT_LENGTH + 1
|
|
|
|
|
|
ssh_msg_channel_window_adjust:
|
|
db SSH_MSG_CHANNEL_WINDOW_ADJUST
|
|
dd_n 0 ; Sender channel
|
|
.wnd dd ?
|
|
.length = $ - ssh_msg_channel_window_adjust
|
|
|
|
|
|
include_debug_strings
|
|
|
|
align 4
|
|
@IMPORT:
|
|
|
|
library network, 'network.obj', \
|
|
console, 'console.obj', \
|
|
libcrash, 'libcrash.obj', \
|
|
libini, 'libini.obj'
|
|
|
|
import network, \
|
|
getaddrinfo, 'getaddrinfo', \
|
|
freeaddrinfo, 'freeaddrinfo', \
|
|
inet_ntoa, 'inet_ntoa'
|
|
|
|
import console, \
|
|
con_start, 'START', \
|
|
con_init, 'con_init', \
|
|
con_write_asciiz, 'con_write_asciiz', \
|
|
con_exit, 'con_exit', \
|
|
con_gets, 'con_gets', \
|
|
con_cls, 'con_cls', \
|
|
con_getch2, 'con_getch2', \
|
|
con_get_flags, 'con_get_flags', \
|
|
con_set_title, 'con_set_title', \
|
|
con_get_input, 'con_get_input'
|
|
|
|
import libcrash, \
|
|
sha512_init, 'sha512_init', \
|
|
sha512_update, 'sha512_update', \
|
|
sha512_final, 'sha512_final',\
|
|
sha256_init, 'sha256_init', \
|
|
sha256_update, 'sha256_update', \
|
|
sha256_final, 'sha256_final',\
|
|
sha1_init, 'sha1_init', \
|
|
sha1_update, 'sha1_update', \
|
|
sha1_final, 'sha1_final', \
|
|
md5_init, 'md5_init', \
|
|
md5_update, 'md5_update', \
|
|
md5_final, 'md5_final'
|
|
|
|
import libini, \
|
|
ini_get_str, 'ini_get_str', \
|
|
ini_set_str, 'ini_set_str'
|
|
|
|
IncludeIGlobals
|
|
|
|
i_end:
|
|
|
|
IncludeUGlobals
|
|
|
|
params rb MAX_HOSTNAME_LENGTH
|
|
|
|
ssh_con sshlib_connection
|
|
ssh_chan sshlib_channel
|
|
|
|
keyb_input rb MAX_INPUT_LENGTH
|
|
|
|
mem:
|