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hidnplayr |
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; ssh_userauth.inc - SSH user authentication |
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; |
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; Copyright (C) 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 . |
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proc sshlib_userauth_password con_ptr, username_sz, password_sz |
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; >> Request service (user-auth) |
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DEBUGF 2, "SSH: Requesting service\n" |
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stdcall sshlib_send_packet, [con_ptr], ssh_msg_request_service, ssh_msg_request_service.length, 0 |
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cmp eax, 0 |
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jl .err |
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; << Check for service acceptance |
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stdcall sshlib_msg_handler, [con_ptr], 0 |
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cmp eax, 0 |
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jl .err |
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mov eax, [con_ptr] |
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cmp [eax + sshlib_connection.rx_buffer.message_code], SSH_MSG_SERVICE_ACCEPT |
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jne .err_proto |
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; >> Request user authentication |
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DEBUGF 2, "SSH: User authentication\n" |
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mcall 68, 12, 1024 ; FIXME: hardcoded size |
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test eax, eax |
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jz .err_nomem |
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mov edi, eax |
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mov ebx, eax |
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mov byte[edi], SSH_MSG_USERAUTH_REQUEST |
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inc edi |
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; Insert username |
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stdcall sz_len, [username_sz] |
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mov ecx, eax |
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mov esi, [username_sz] |
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bswap eax |
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stosd |
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rep movsb |
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mov dword[edi], 0x0e000000 ; 14 Bswapped |
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mov dword[edi+4], "ssh-" |
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mov dword[edi+8], "conn" |
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mov dword[edi+12], "ecti" |
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mov word[edi+16], "on" |
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add edi, 18 |
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mov dword[edi], 0x08000000 ; 8 Bswapped |
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mov dword[edi+4], "pass" |
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mov dword[edi+8], "word" |
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mov byte[edi+12], 0 ; bool |
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add edi, 13 |
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; Insert password |
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stdcall sz_len, [password_sz] |
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mov ecx, eax |
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mov esi, [password_sz] |
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bswap eax |
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stosd |
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rep movsb |
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sub edi, ebx |
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push ebx |
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stdcall sshlib_send_packet, [con_ptr], ebx, edi, 0 |
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; Clear used buffer and free |
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pop edx |
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mov edi, edx |
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push eax |
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mov ecx, 1024/4 ; FIXME |
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xor eax, eax |
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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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jl .err |
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; << Check for userauth acceptance |
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@@: |
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stdcall sshlib_msg_handler, [con_ptr], 0 |
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cmp eax, 0 |
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jl .err |
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mov eax, [con_ptr] |
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mov al, [eax + sshlib_connection.rx_buffer.message_code] |
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cmp al, SSH_MSG_USERAUTH_BANNER |
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je @r ; TODO |
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cmp al, SSH_MSG_USERAUTH_FAILURE |
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je .fail |
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cmp al, SSH_MSG_USERAUTH_SUCCESS |
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jne .err_proto |
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xor eax, eax |
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.err: |
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ret |
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.fail: |
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xor eax, eax |
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inc eax |
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ret |
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.err_proto: |
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mov eax, SSHLIB_ERR_PROTOCOL |
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ret |
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.err_nomem: |
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mov eax, SSHLIB_ERR_NOMEM |
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ret |
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endp |
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; Actually, string is \n and/or \0 terminated 0_o |
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proc sz_len uses ecx edi, string |
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mov edi, [string] |
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mov ecx, 256 ;;;; |
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mov al, 10 |
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repne scasb |
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dec edi |
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sub edi, [string] |
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mov eax, edi |
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ret |
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endp |