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/* wptSOCKS.cpp - SOCKS proxy support |
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* Copyright (C) 2006 Timo Schulz |
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* |
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* This file is part of WinPT. |
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* |
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* WinPT is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 |
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* of the License, or (at your option) any later version. |
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* |
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* WinPT 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 GNU |
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* 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 WinPT; if not, write to the Free Software Foundation, |
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#ifdef HAVE_CONFIG_H |
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#include <config.h> |
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#endif |
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#include <windows.h> |
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|
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#include "wptTypes.h" |
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#include "wptGPG.h" |
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#include "wptKeyserver.h" |
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#include "wptErrors.h" |
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#include "wptNLS.h" |
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|
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/* Known socks errors. */ |
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enum socks5_error_t { |
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ERR_SUCCESS = 0x00, |
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ERR_GENERAL = 0x01, |
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ERR_NOTALLOWED = 0x02, |
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ERR_NETUNREACH = 0x03, |
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ERR_HOSTUNREACH = 0x04, |
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ERR_CONNREFUSED = 0x05, |
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ERR_INVADDR = 0x08 |
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}; |
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|
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/* Known socks address types. */ |
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enum socks5_addr_t { |
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ADDR_IPV4 = 0x01, |
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ADDR_DOMAIN = 0x03, |
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ADDR_IPV6 = 0x04 |
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}; |
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|
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/* Known socks authentication methods. */ |
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enum socks5_method_t { |
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METH_NOAUTH = 0x00, |
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METH_GSSAPI = 0x01, |
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METH_USERPASS = 0x02, |
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METH_ERR = 0xFF |
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}; |
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|
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|
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/* Return human readable SOCKS error. */ |
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static const char* |
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socks_strerror (int err) |
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{ |
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switch (err) { |
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case ERR_SUCCESS: _("No error"); break; |
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case ERR_GENERAL: _("General SOCKS error"); break; |
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case ERR_NOTALLOWED: _("Connection not allowed by ruleset"); break; |
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case ERR_NETUNREACH: _("Network is unreachable"); break; |
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case ERR_HOSTUNREACH: _("Host could not be resolved"); break; |
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case ERR_CONNREFUSED: _("Connection refused"); break; |
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case ERR_INVADDR: _("Address type is not supported"); break; |
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} |
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return _("Unknown SOCKS error"); |
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} |
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|
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|
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/* Send initial method packet. */ |
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static int |
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send_methods (int conn_fd) |
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{ |
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BYTE pkt[4]; |
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|
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pkt[0] = 0x05; |
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pkt[1] = 0x02; |
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pkt[2] = METH_NOAUTH; |
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pkt[3] = METH_USERPASS; |
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if (send (conn_fd, (const char*)pkt, 4, 0) == SOCKET_ERROR) { |
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log_debug ("send_methods failed ec=%d\n", (int)WSAGetLastError ()); |
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return -1; |
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} |
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return 0; |
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} |
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|
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|
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/* Parse the chosen server method. */ |
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static int |
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recv_method (int conn_fd) |
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{ |
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BYTE pkt[2]; |
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|
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if (recv (conn_fd, (char*)pkt, 2, 0) == SOCKET_ERROR) { |
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log_debug ("recv_method failed ec=%d\n", (int)WSAGetLastError ()); |
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return -1; |
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} |
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if (pkt[0] != 0x05) { |
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log_debug ("recv_method: protocol violation\n"); |
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return -1; |
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} |
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return pkt[1]; |
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} |
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|
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|
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/* |
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+----+------+----------+------+----------+ |
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|VER | ULEN | UNAME | PLEN | PASSWD | |
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+----+------+----------+------+----------+ |
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| 1 | 1 | 1 to 255 | 1 | 1 to 255 | |
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+----+------+----------+------+----------+ |
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Do user/password authentication. |
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*/ |
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static int |
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do_userpass_auth (int conn_fd, keyserver_proxy_t ctx, int *err) |
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{ |
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BYTE *pkt; |
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DWORD pktlen; |
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|
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*err = 0; |
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pktlen = 1+1+strlen (ctx->user)+1+strlen (ctx->pass); |
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pkt = (BYTE*)malloc (pktlen); |
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pkt[0] = 0x05; |
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pkt[1] = strlen (ctx->user); |
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memcpy (pkt+2, ctx->user, strlen (ctx->user)); |
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pkt[2+strlen (ctx->user)] = strlen (ctx->pass); |
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memcpy (pkt+2+strlen (ctx->user)+1, ctx->pass, strlen (ctx->pass)); |
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if (send (conn_fd, (const char*)pkt, pktlen, 0) == SOCKET_ERROR) { |
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log_debug ("do_userpass_auth failed ec=%d\n", (int)WSAGetLastError ()); |
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free (pkt); |
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return -1; |
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} |
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/* Parse reply [VER 1|STATUS 1] */ |
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if (recv (conn_fd, (char*)pkt, 2, 0) == SOCKET_ERROR) { |
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log_debug ("do_userpass_auth failed ec=%d\n", (int)WSAGetLastError ()); |
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free (pkt); |
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return -1; |
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} |
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*err = pkt[1]; |
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free (pkt); |
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if (*err != ERR_SUCCESS) |
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return -1; |
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return 0; |
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} |
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|
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|
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/* Do the actual authentication. */ |
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static int |
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do_auth (int conn_fd, int auth_method, keyserver_proxy_t ctx, int *err) |
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{ |
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switch (auth_method) { |
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case PROXY_AUTH_NONE: |
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*err = 0; |
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return 0; |
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|
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case PROXY_AUTH_PLAIN: |
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return do_userpass_auth (conn_fd, ctx, err); |
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|
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default: |
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return -1; |
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} |
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return 0; |
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} |
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|
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|
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/* |
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+----+-----+-------+------+----------+----------+ |
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|VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT | |
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+----+-----+-------+------+----------+----------+ |
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| 1 | 1 | X'00' | 1 | Variable | 2 | |
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+----+-----+-------+------+----------+----------+ |
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Send a connection reqeust for host @host and port @port. |
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*/ |
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static int |
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send_connect_request (int conn_fd, const char *host, WORD port) |
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{ |
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struct hostent *hp; |
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DWORD addr; |
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BYTE pkt[10]; |
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|
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addr = inet_addr (host); |
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if (addr == INADDR_NONE) { |
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hp = gethostbyname (host); |
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if (hp != NULL) |
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memcpy ((char*)&addr, hp->h_addr_list, hp->h_length); |
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else { |
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log_debug ("gethostbyname() failed ec=%d\n", (int)WSAGetLastError ()); |
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return -1; |
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} |
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} |
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|
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pkt[0] = 0x05; |
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pkt[1] = 0x01; /*CONNECT*/ |
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pkt[2] = 0x00; |
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pkt[3] = ADDR_IPV4; |
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pkt[4] = (BYTE)addr >> 24; |
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pkt[5] = (BYTE)addr >> 16; |
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pkt[6] = (BYTE)addr >> 8; |
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pkt[7] = (BYTE)addr >> 0; |
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pkt[8] = (BYTE)port >> 8; |
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pkt[9] = (BYTE)port >> 0; |
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if (send (conn_fd, (const char*)pkt, 9, 0) == SOCKET_ERROR) { |
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log_debug ("send_connect_request failed ec=%d\n", (int)WSAGetLastError ()); |
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return -1; |
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} |
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|
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return 0; |
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} |
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|
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|
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/* |
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+----+-----+-------+------+----------+----------+ |
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|VER | REP | RSV | ATYP | BND.ADDR | BND.PORT | |
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+----+-----+-------+------+----------+----------+ |
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| 1 | 1 | X'00' | 1 | Variable | 2 | |
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+----+-----+-------+------+----------+----------+ |
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Parse the connect reply. |
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Set @err with the specific error value. |
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*/ |
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static int |
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recv_connect_reply (int conn_fd, int *err) |
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{ |
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BYTE pkt[4], addr[16], port[2]; |
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int ndomain; |
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|
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*err = 0; |
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if (recv (conn_fd, (char*)pkt, 4, 0) == SOCKET_ERROR) |
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return -1; |
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if (pkt[0] != 0x05 || pkt[2] != 0x00) { |
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log_debug ("recv_connect_reply: protocol violation.\n"); |
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return -1; |
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} |
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*err = pkt[1]; |
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if (pkt[1] != ERR_SUCCESS) |
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return -1; |
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switch (pkt[3]) { |
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case ADDR_IPV4: |
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if (recv (conn_fd, (char*)addr, 4, 0) == SOCKET_ERROR) |
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return -1; |
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break; |
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|
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case ADDR_DOMAIN: |
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recv (conn_fd, (char*)addr, 1, 0); |
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ndomain = addr[0]; |
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while (ndomain-- > 0) |
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recv (conn_fd, (char*)addr, 1, 0); |
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break; |
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|
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case ADDR_IPV6: |
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if ( recv (conn_fd, (char*)addr, 16, 0) == SOCKET_ERROR) |
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return -1; |
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break; |
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} |
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if (recv (conn_fd, (char*)port, 2, 0) == SOCKET_ERROR) |
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return -1; |
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return 0; |
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} |
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|
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|
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/* Perform all needed steps to initiate a SOCKSv5 proxy connection .*/ |
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int |
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socks_handshake (keyserver_proxy_t ctx, int conn_fd, |
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const char *hostname, WORD port) |
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{ |
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int method, err; |
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|
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if (send_methods (conn_fd)) |
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return -1; |
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method = recv_method (conn_fd); |
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if (method == METH_ERR) { |
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msg_box (NULL, _("No acceptable methods"), _("SOCKS Proxy"), MB_ERR); |
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return -1; |
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} |
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if (do_auth (conn_fd, method, ctx, &err)) { |
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if (!err) |
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msg_box (NULL, _("Authentication failed or unspported"), _("SOCKS Proxy"), MB_ERR); |
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else |
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msg_box (NULL, socks_strerror (err), _("SOCKS Proxy"), MB_ERR); |
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return -1; |
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} |
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if (send_connect_request (conn_fd, hostname, port)) { |
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msg_box (NULL, _("Could not send SOCKS request"), _("SOCKS Proxy"), MB_ERR); |
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return -1; |
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} |
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if (recv_connect_reply (conn_fd, &err)) { |
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if (!err) |
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msg_box (NULL, _("Error while parsing SOCKS reply"), _("SOCKS Proxy"), MB_ERR); |
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else |
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msg_box (NULL, socks_strerror (err), _("SOCKS Proxy"), MB_ERR); |
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return -1; |
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} |
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return 0; |
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} |
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