569 lines
20 KiB
PHP
569 lines
20 KiB
PHP
; sshlib_connection.inc - SSH connection
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;
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; Copyright (C) 2016-2024 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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; https://www.ietf.org/rfc/rfc4253.txt
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proc sshlib_connect con_ptr, hostname_sz
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locals
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socketnum dd ?
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sockaddr sockaddr_in
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ctx_ptr dd ?
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endl
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mov edi, [con_ptr]
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lea eax, [edi + sshlib_connection.part_ex_hash_ctx]
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mov [ctx_ptr], eax
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; Set default values in sockaddr struct
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mov [sockaddr.sin_family], AF_INET4
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mov [sockaddr.sin_port], 22 shl 8
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; Parse hostname_sz
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; Verify length, extract port number if given and copy base url to sshlib_connection struct
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; Port number, if provided, will be written in sockaddr struct.
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; Hostname ends with any character equal to 0x20 or lower
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mov esi, [hostname_sz]
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lea edi, [edi + sshlib_connection.hostname_sz]
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mov ecx, MAX_HOSTNAME_LENGTH
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@@:
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dec ecx
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jz .err_hostname
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lodsb
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cmp al, ':'
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je .do_port
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stosb
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cmp al, 0x20
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ja @r
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mov byte[edi-1], 0
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jmp .hostname_ok
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.do_port:
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xor eax, eax
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xor ebx, ebx
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mov byte[edi-1], 0
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.portloop:
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lodsb
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cmp al, 0x20
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jbe .port_done
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sub al, '0'
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jb .err_hostname
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cmp al, 9
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ja .err_hostname
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lea ebx, [ebx*4+ebx]
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shl ebx, 1
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add ebx, eax
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jmp .portloop
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.port_done:
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xchg bl, bh
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mov [sockaddr.sin_port], bx
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.hostname_ok:
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; resolve name
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push esp ; reserve stack place
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push esp
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mov eax, [con_ptr]
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lea eax, [eax+sshlib_connection.hostname_sz]
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invoke getaddrinfo, eax, 0, 0
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pop esi
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; test for error
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test eax, eax
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jnz .err_hostname
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; convert IP address to decimal notation
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mov eax, [esi+addrinfo.ai_addr]
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mov eax, [eax+sockaddr_in.sin_addr]
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mov [sockaddr.sin_addr], eax
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invoke inet_ntoa, eax
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; write result
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stdcall sshlib_callback_connecting, [con_ptr], eax
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; free allocated memory
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invoke freeaddrinfo, esi
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; Create socket
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mcall socket, AF_INET4, SOCK_STREAM, 0
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cmp eax, -1
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jz .err_sock
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mov [socketnum], eax
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mov ebx, [con_ptr]
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mov [ebx + sshlib_connection.socketnum], eax
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; Connect
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DEBUGF 2, "Connecting to server\n"
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lea edx, [sockaddr]
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mcall connect, [socketnum], , sizeof.sockaddr_in
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test eax, eax
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jnz .err_sock
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; Start calculating hash
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invoke sha2_256.init, [ctx_ptr]
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; HASH: string V_C, the client's version string (CR and NL excluded)
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invoke sha2_256.update, [ctx_ptr], ssh_ident_ha, ssh_msg_ident.length+4-2
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; >> Send our identification string
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DEBUGF 2, "Sending ID string\n"
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mcall send, [socketnum], ssh_msg_ident, ssh_msg_ident.length, 0
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cmp eax, -1
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je .err_sock
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; << Check protocol version of server
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mov edx, [con_ptr]
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lea edx, [edx + sshlib_connection.rx_buffer + 4]
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mcall recv, [socketnum], , PACKETSIZE, 0
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cmp eax, -1
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je .err_sock
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DEBUGF 2, "Received ID string\n"
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cmp dword[edx], "SSH-"
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jne .err_proto
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cmp dword[edx+4], "2.0-"
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jne .err_proto
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; HASH: string V_S, the server's version string (CR and NL excluded)
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lea ecx, [eax+2]
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sub eax, 2
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bswap eax
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sub edx, 4
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mov dword[edx], eax
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invoke sha2_256.update, [ctx_ptr], edx, ecx
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; >> Key Exchange init
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mov eax, [con_ptr]
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mov [eax + sshlib_connection.status], SSHLIB_CON_STAT_INIT
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mov [eax + sshlib_connection.algo_kex], SSHLIB_ALGO_NONE
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mov [eax + sshlib_connection.algo_hostkey], SSHLIB_ALGO_NONE
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mov [eax + sshlib_connection.algo_crypt_rx], SSHLIB_ALGO_NONE
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mov [eax + sshlib_connection.algo_crypt_tx], SSHLIB_ALGO_NONE
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mov [eax + sshlib_connection.algo_mac_rx], SSHLIB_ALGO_NONE
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mov [eax + sshlib_connection.algo_mac_tx], SSHLIB_ALGO_NONE
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mov [eax + sshlib_connection.algo_compr_rx], SSHLIB_ALGO_NONE
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mov [eax + sshlib_connection.algo_compr_tx], SSHLIB_ALGO_NONE
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mov [eax + sshlib_connection.rx_mac_seqnr], 0
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mov [eax + sshlib_connection.tx_mac_seqnr], 0
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mov [eax + sshlib_connection.rx_crypt_blocksize], 4 ; minimum blocksize
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mov [eax + sshlib_connection.tx_crypt_blocksize], 4
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mov [eax + sshlib_connection.rx_crypt_proc], 0
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mov [eax + sshlib_connection.tx_crypt_proc], 0
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mov [eax + sshlib_connection.rx_mac_proc], 0
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mov [eax + sshlib_connection.tx_mac_proc], 0
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mov [eax + sshlib_connection.rx_mac_length], 0
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mov [eax + sshlib_connection.tx_mac_length], 0
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mov [eax + sshlib_connection.tx_pad_size], 8
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mov [eax + sshlib_connection.rx_proc], sshlib_recv_packet_clear
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mov [eax + sshlib_connection.tx_proc], sshlib_send_packet_clear
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DEBUGF 2, "Sending KEX init\n"
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mov edi, ssh_msg_kex.cookie
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call MBRandom
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stosd
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call MBRandom
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stosd
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call MBRandom
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stosd
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call MBRandom
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stosd
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stdcall sshlib_send_packet, [con_ptr], ssh_msg_kex, ssh_msg_kex.length, 0
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cmp eax, -1
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je .err_sock
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; HASH: string I_C, the payload of the client's SSH_MSG_KEXINIT
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mov esi, [con_ptr]
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mov eax, [esi+sshlib_connection.tx_buffer.packet_length]
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bswap eax
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movzx ebx, [esi+sshlib_connection.tx_buffer.padding_length]
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sub eax, ebx
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dec eax
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lea edx, [eax+4]
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bswap eax
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lea esi, [esi+sshlib_connection.tx_buffer+1]
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mov dword[esi], eax
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invoke sha2_256.update, [ctx_ptr], esi, edx
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; << Check key exchange init of server
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stdcall sshlib_recv_packet, [con_ptr], 0
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cmp eax, -1
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je .err_sock
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mov esi, [con_ptr]
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cmp [esi + sshlib_connection.rx_buffer.message_code], SSH_MSG_KEXINIT
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jne .err_proto
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DEBUGF 2, "Received KEX init\n"
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lea esi, [esi + sshlib_connection.rx_buffer + sizeof.ssh_packet_header + 16]
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lodsd
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bswap eax
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DEBUGF 1, "kex_algorithms: %s\n", esi
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add esi, eax
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lodsd
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bswap eax
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DEBUGF 1, "server_host_key_algorithms: %s\n", esi
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add esi, eax
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lodsd
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bswap eax
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DEBUGF 1, "encryption_algorithms_client_to_server: %s\n", esi
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add esi, eax
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lodsd
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bswap eax
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DEBUGF 1, "encryption_algorithms_server_to_client: %s\n", esi
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add esi, eax
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lodsd
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bswap eax
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DEBUGF 1, "mac_algorithms_client_to_server: %s\n", esi
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add esi, eax
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lodsd
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bswap eax
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DEBUGF 1, "mac_algorithms_server_to_client: %s\n", esi
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add esi, eax
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lodsd
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bswap eax
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DEBUGF 1, "compression_algorithms_client_to_server: %s\n", esi
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add esi, eax
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lodsd
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bswap eax
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DEBUGF 1, "compression_algorithms_server_to_client: %s\n", esi
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add esi, eax
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lodsd
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bswap eax
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DEBUGF 1, "languages_client_to_server: %s\n", esi
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add esi, eax
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lodsd
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bswap eax
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DEBUGF 1, "languages_server_to_client: %s\n", esi
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add esi, eax
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lodsb
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DEBUGF 1, "KEX First Packet Follows: %u\n", al
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; TODO: parse this structure and set algorithm codes accordingly
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; FIXME: hardcoded for now
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mov esi, [con_ptr]
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mov [esi+sshlib_connection.algo_kex], SSHLIB_KEX_DH_SHA256
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mov [esi+sshlib_connection.algo_hostkey], SSHLIB_HOSTKEY_RSA
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mov [esi+sshlib_connection.algo_crypt_rx], SSHLIB_CRYPT_AES256_CTR
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mov [esi+sshlib_connection.algo_crypt_tx], SSHLIB_CRYPT_AES256_CTR ; SSHLIB_CRYPT_CHACHA20_POLY1305
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mov [esi+sshlib_connection.algo_mac_rx], SSHLIB_HMAC_SHA2_256_ETM
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mov [esi+sshlib_connection.algo_mac_tx], SSHLIB_HMAC_SHA2_256_ETM
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mov [esi+sshlib_connection.algo_compr_rx], SSHLIB_ALGO_NONE
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mov [esi+sshlib_connection.algo_compr_tx], SSHLIB_ALGO_NONE
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; HASH: string I_S, the payload of the servers's SSH_MSG_KEXINIT
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mov esi, [con_ptr]
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mov eax, [esi+sshlib_connection.rx_buffer.packet_length]
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movzx ebx, [esi+sshlib_connection.rx_buffer.padding_length]
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sub eax, ebx
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dec eax
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lea edx, [eax+4]
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bswap eax
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lea esi, [esi+sshlib_connection.rx_buffer+1]
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mov dword[esi], eax
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invoke sha2_256.update, [ctx_ptr], esi, edx
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; Exchange keys with the server
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stdcall sshlib_dh_gex, [con_ptr]
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test eax, eax
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jnz .err
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; Set keys and initialize transport subroutines
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DEBUGF 2, "SSH: Setting encryption keys\n"
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mov ebx, [con_ptr]
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cmp [ebx + sshlib_connection.algo_crypt_rx], SSHLIB_CRYPT_AES256_CTR
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je .rx_crypt_aes256_ctr
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cmp [ebx + sshlib_connection.algo_crypt_rx], SSHLIB_CRYPT_AES256_CBC
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je .rx_crypt_aes256_cbc
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cmp [ebx + sshlib_connection.algo_crypt_rx], SSHLIB_CRYPT_CHACHA20_POLY1305
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je .rx_crypt_poly1305_chacha20
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jmp .err_proto
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.rx_crypt_aes256_ctr:
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lea ecx, [ebx + sshlib_connection.rx_crypt_ctx]
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lea edx, [ebx + sshlib_connection.rx_enc_key]
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lea esi, [ebx + sshlib_connection.rx_iv]
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invoke aes256ctr.init, ecx, edx, esi, 0
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push [aes256ctr.update]
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pop [ebx + sshlib_connection.rx_crypt_proc]
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mov [ebx + sshlib_connection.rx_crypt_blocksize], 16 ; AES_BLOCKSIZE
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jmp .have_rx_crypt
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.rx_crypt_aes256_cbc:
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lea ecx, [ebx + sshlib_connection.rx_crypt_ctx]
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lea edx, [ebx + sshlib_connection.rx_enc_key]
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lea esi, [ebx + sshlib_connection.rx_iv]
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invoke aes256cbc.init, ecx, edx, esi, 0
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push [aes256cbc.update]
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pop [ebx + sshlib_connection.rx_crypt_proc]
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mov [ebx + sshlib_connection.rx_crypt_blocksize], 16 ; AES_BLOCKSIZE
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jmp .have_rx_crypt
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.rx_crypt_poly1305_chacha20:
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mov [ebx + sshlib_connection.rx_proc], sshlib_recv_packet_poly1305chacha20
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jmp .have_rx_crypt_and_mac
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.have_rx_crypt:
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cmp [ebx + sshlib_connection.algo_mac_rx], SSHLIB_HMAC_SHA2_256
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je .rx_hmac_sha2_256
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cmp [ebx + sshlib_connection.algo_mac_rx], SSHLIB_HMAC_SHA2_512
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je .rx_hmac_sha2_512
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cmp [ebx + sshlib_connection.algo_mac_rx], SSHLIB_HMAC_SHA2_256_ETM
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je .rx_hmac_sha2_256_etm
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cmp [ebx + sshlib_connection.algo_mac_rx], SSHLIB_HMAC_SHA2_512_ETM
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je .rx_hmac_sha2_512_etm
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jmp .err_proto
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.rx_hmac_sha2_256:
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push [hmac_sha2_256.oneshot]
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pop [ebx + sshlib_connection.rx_mac_proc]
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mov [ebx + sshlib_connection.rx_mac_length], SHA2_256_LEN
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mov [ebx + sshlib_connection.rx_proc], sshlib_recv_packet_hmac
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jmp .have_rx_crypt_and_mac
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.rx_hmac_sha2_512:
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push [hmac_sha2_512.oneshot]
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pop [ebx + sshlib_connection.rx_mac_proc]
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mov [ebx + sshlib_connection.rx_mac_length], SHA2_512_LEN
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mov [ebx + sshlib_connection.rx_proc], sshlib_recv_packet_hmac
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jmp .have_rx_crypt_and_mac
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.rx_hmac_sha2_256_etm:
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push [hmac_sha2_256.oneshot]
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pop [ebx + sshlib_connection.rx_mac_proc]
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mov [ebx + sshlib_connection.rx_mac_length], SHA2_256_LEN
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mov [ebx + sshlib_connection.rx_proc], sshlib_recv_packet_hmac_etm
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jmp .have_rx_crypt_and_mac
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.rx_hmac_sha2_512_etm:
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push [hmac_sha2_512.oneshot]
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pop [ebx + sshlib_connection.rx_mac_proc]
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mov [ebx + sshlib_connection.rx_mac_length], SHA2_512_LEN
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mov [ebx + sshlib_connection.rx_proc], sshlib_recv_packet_hmac_etm
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jmp .have_rx_crypt_and_mac
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.have_rx_crypt_and_mac:
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cmp [ebx + sshlib_connection.algo_crypt_tx], SSHLIB_CRYPT_AES256_CTR
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je .tx_crypt_aes256_ctr
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cmp [ebx + sshlib_connection.algo_crypt_tx], SSHLIB_CRYPT_AES256_CBC
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je .tx_crypt_aes256_cbc
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cmp [ebx + sshlib_connection.algo_crypt_tx], SSHLIB_CRYPT_CHACHA20_POLY1305
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je .tx_crypt_poly1305_chacha20
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jmp .err_proto
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.tx_crypt_aes256_ctr:
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lea ecx, [ebx + sshlib_connection.tx_crypt_ctx]
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lea edx, [ebx + sshlib_connection.tx_enc_key]
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lea esi, [ebx + sshlib_connection.tx_iv]
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invoke aes256ctr.init, ecx, edx, esi, 0
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push [aes256ctr.update]
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pop [ebx + sshlib_connection.tx_crypt_proc]
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mov [ebx + sshlib_connection.tx_crypt_blocksize], 16 ; AES_BLOCKSIZE
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mov [ebx + sshlib_connection.tx_pad_size], 16 ; AES_BLOCKSIZE
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jmp .have_tx_crypt
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.tx_crypt_aes256_cbc:
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lea ecx, [ebx + sshlib_connection.tx_crypt_ctx]
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lea edx, [ebx + sshlib_connection.tx_enc_key]
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lea esi, [ebx + sshlib_connection.tx_iv]
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invoke aes256cbc.init, ecx, edx, esi, 0
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push [aes256cbc.update]
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pop [ebx + sshlib_connection.tx_crypt_proc]
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mov [ebx + sshlib_connection.tx_crypt_blocksize], 16 ; AES_BLOCKSIZE
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mov [ebx + sshlib_connection.tx_pad_size], 16 ; AES_BLOCKSIZE
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jmp .have_tx_crypt
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.tx_crypt_poly1305_chacha20:
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mov [ebx + sshlib_connection.tx_proc], sshlib_send_packet_poly1305chacha20
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jmp .have_tx_crypt_and_mac
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.have_tx_crypt:
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cmp [ebx + sshlib_connection.algo_mac_tx], SSHLIB_HMAC_SHA2_256
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je .tx_hmac_sha2_256
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cmp [ebx + sshlib_connection.algo_mac_tx], SSHLIB_HMAC_SHA2_512
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je .tx_hmac_sha2_512
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cmp [ebx + sshlib_connection.algo_mac_tx], SSHLIB_HMAC_SHA2_256_ETM
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je .tx_hmac_sha2_256_etm
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cmp [ebx + sshlib_connection.algo_mac_tx], SSHLIB_HMAC_SHA2_512_ETM
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je .tx_hmac_sha2_512_etm
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jmp .err_proto
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.tx_hmac_sha2_256:
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push [hmac_sha2_256.oneshot]
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pop [ebx + sshlib_connection.tx_mac_proc]
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mov [ebx + sshlib_connection.tx_mac_length], SHA2_256_LEN
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mov [ebx + sshlib_connection.tx_proc], sshlib_send_packet_hmac
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jmp .have_tx_crypt_and_mac
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.tx_hmac_sha2_512:
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push [hmac_sha2_512.oneshot]
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pop [ebx + sshlib_connection.tx_mac_proc]
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mov [ebx + sshlib_connection.tx_mac_length], SHA2_512_LEN
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mov [ebx + sshlib_connection.tx_proc], sshlib_send_packet_hmac
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jmp .have_tx_crypt_and_mac
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.tx_hmac_sha2_256_etm:
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push [hmac_sha2_256.oneshot]
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pop [ebx + sshlib_connection.tx_mac_proc]
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mov [ebx + sshlib_connection.tx_mac_length], SHA2_256_LEN
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mov [ebx + sshlib_connection.tx_proc], sshlib_send_packet_hmac_etm
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jmp .have_tx_crypt_and_mac
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.tx_hmac_sha2_512_etm:
|
|
push [hmac_sha2_512.oneshot]
|
|
pop [ebx + sshlib_connection.tx_mac_proc]
|
|
mov [ebx + sshlib_connection.tx_mac_length], SHA2_512_LEN
|
|
mov [ebx + sshlib_connection.tx_proc], sshlib_send_packet_hmac_etm
|
|
jmp .have_tx_crypt_and_mac
|
|
|
|
|
|
.have_tx_crypt_and_mac:
|
|
|
|
|
|
; Re-seed RNG for padding bytes
|
|
|
|
call create_seed
|
|
call init_random
|
|
|
|
xor eax, eax
|
|
ret
|
|
|
|
.err_hostname:
|
|
mov eax, SSHLIB_ERR_HOSTNAME
|
|
ret
|
|
|
|
.err_sock:
|
|
mov eax, SSHLIB_ERR_SOCKET
|
|
ret
|
|
|
|
.err_proto:
|
|
mov eax, SSHLIB_ERR_PROTOCOL
|
|
ret
|
|
|
|
.err:
|
|
ret
|
|
|
|
endp
|
|
|
|
|
|
|
|
|
|
; Handle common messages and return to caller for specific ones
|
|
proc sshlib_msg_handler, con_ptr, flags
|
|
|
|
.recv:
|
|
; Send a window update if advertised window drops below half
|
|
cmp [ssh_chan.rcv_wnd], BUFFERSIZE/2
|
|
ja .no_wnd
|
|
mov eax, BUFFERSIZE
|
|
bswap eax
|
|
mov [ssh_msg_channel_window_adjust.wnd], eax
|
|
stdcall sshlib_send_packet, [con_ptr], ssh_msg_channel_window_adjust, ssh_msg_channel_window_adjust.length, 0
|
|
mov [ssh_chan.rcv_wnd], BUFFERSIZE
|
|
.no_wnd:
|
|
|
|
; Receive 1 SSH packet
|
|
stdcall sshlib_recv_packet, [con_ptr], [flags]
|
|
cmp eax, 0
|
|
jle .ret
|
|
|
|
mov esi, [con_ptr]
|
|
lea esi, [esi + sshlib_connection.rx_buffer]
|
|
mov al, [esi + ssh_packet_header.message_code]
|
|
add esi, sizeof.ssh_packet_header
|
|
|
|
cmp al, SSH_MSG_DISCONNECT
|
|
je .disc
|
|
cmp al, SSH_MSG_IGNORE
|
|
je .ign
|
|
cmp al, SSH_MSG_DEBUG
|
|
je .dbg
|
|
cmp al, SSH_MSG_GLOBAL_REQUEST
|
|
je .glob_req
|
|
cmp al, SSH_MSG_CHANNEL_WINDOW_ADJUST
|
|
je .chan_win_adj
|
|
; cmp al, SSH_MSG_CHANNEL_REQUEST
|
|
; je .chan_req
|
|
cmp al, SSH_MSG_CHANNEL_EOF
|
|
je .chan_eof
|
|
cmp al, SSH_MSG_CHANNEL_CLOSE
|
|
je .chan_close
|
|
|
|
DEBUGF 3, "SSH: Message type: %u\n", al
|
|
|
|
.ret:
|
|
ret
|
|
|
|
.disc:
|
|
DEBUGF 3, "SSH: Disconnect message received\n"
|
|
mov eax, SSHLIB_ERR_DISCONNECTING
|
|
ret
|
|
|
|
.ign:
|
|
DEBUGF 3, "SSH: Ignore MSG received\n"
|
|
jmp .recv
|
|
|
|
.dbg:
|
|
DEBUGF 3, "SSH: Debug MSG received\n"
|
|
;TODO
|
|
jmp .recv
|
|
|
|
.glob_req:
|
|
add esi, 4
|
|
DEBUGF 3, "SSH: Global MSG received: %s\n", esi
|
|
;TODO
|
|
jmp .recv
|
|
|
|
.chan_win_adj:
|
|
mov eax, dword[esi]
|
|
bswap eax
|
|
mov [ssh_chan.snd_wnd], eax
|
|
; TODO: validate channel number, act accordingly
|
|
DEBUGF 3, "SSH: Channel %u window update received\n", eax
|
|
jmp .recv
|
|
|
|
.chan_eof:
|
|
mov eax, dword[esi]
|
|
bswap eax
|
|
; TODO: validate channel number, act accordingly
|
|
DEBUGF 3, "SSH: Channel %u EOF received\n", eax
|
|
jmp .recv
|
|
|
|
.chan_close:
|
|
mov eax, dword[esi]
|
|
bswap eax
|
|
; TODO: validate channel number
|
|
DEBUGF 3, "SSH: Channel %u close received\n", eax
|
|
; Reply with close message
|
|
stdcall sshlib_send_packet, [con_ptr], ssh_msg_channel_close, ssh_msg_channel_close.length, 0
|
|
xor eax, eax
|
|
ret
|
|
|
|
endp
|