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openvpn-gui/proxy.c

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/*
* OpenVPN-GUI -- A Windows GUI for OpenVPN.
*
* Copyright (C) 2004 Mathias Sundman <mathias@nilings.se>
* 2011 Heiko Hund <heikoh@users.sf.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <windows.h>
#include <windowsx.h>
#include <prsht.h>
#include <tchar.h>
#include <winhttp.h>
#include <stdlib.h>
#include "main.h"
#include "options.h"
#include "registry.h"
#include "proxy.h"
#include "openvpn-gui-res.h"
#include "localization.h"
#include "manage.h"
#include "openvpn.h"
#include "misc.h"
extern options_t o;
INT_PTR CALLBACK
ProxySettingsDialogFunc(HWND hwndDlg, UINT msg, WPARAM wParam, UNUSED LPARAM lParam)
{
HICON hIcon;
LPPSHNOTIFY psn;
switch (msg)
{
case WM_INITDIALOG:
hIcon = LoadLocalizedIcon(ID_ICO_APP);
if (hIcon)
{
SendMessage(hwndDlg, WM_SETICON, (WPARAM) (ICON_SMALL), (LPARAM) (hIcon));
SendMessage(hwndDlg, WM_SETICON, (WPARAM) (ICON_BIG), (LPARAM) (hIcon));
}
/* Limit Port editbox to 5 chars. */
SendMessage(GetDlgItem(hwndDlg, ID_EDT_PROXY_PORT), EM_SETLIMITTEXT, 5, 0);
LoadProxySettings(hwndDlg);
break;
case WM_COMMAND:
switch (LOWORD(wParam))
{
case ID_RB_PROXY_OPENVPN:
if (HIWORD(wParam) == BN_CLICKED)
{
EnableWindow(GetDlgItem(hwndDlg, ID_RB_PROXY_HTTP), FALSE);
EnableWindow(GetDlgItem(hwndDlg, ID_RB_PROXY_SOCKS), FALSE);
EnableWindow(GetDlgItem(hwndDlg, ID_EDT_PROXY_ADDRESS), FALSE);
EnableWindow(GetDlgItem(hwndDlg, ID_EDT_PROXY_PORT), FALSE);
EnableWindow(GetDlgItem(hwndDlg, ID_TXT_PROXY_ADDRESS), FALSE);
EnableWindow(GetDlgItem(hwndDlg, ID_TXT_PROXY_PORT), FALSE);
}
break;
case ID_RB_PROXY_MSIE:
if (HIWORD(wParam) == BN_CLICKED)
{
EnableWindow(GetDlgItem(hwndDlg, ID_RB_PROXY_HTTP), FALSE);
EnableWindow(GetDlgItem(hwndDlg, ID_RB_PROXY_SOCKS), FALSE);
EnableWindow(GetDlgItem(hwndDlg, ID_EDT_PROXY_ADDRESS), FALSE);
EnableWindow(GetDlgItem(hwndDlg, ID_EDT_PROXY_PORT), FALSE);
EnableWindow(GetDlgItem(hwndDlg, ID_TXT_PROXY_ADDRESS), FALSE);
EnableWindow(GetDlgItem(hwndDlg, ID_TXT_PROXY_PORT), FALSE);
}
break;
case ID_RB_PROXY_MANUAL:
if (HIWORD(wParam) == BN_CLICKED)
{
EnableWindow(GetDlgItem(hwndDlg, ID_RB_PROXY_HTTP), TRUE);
EnableWindow(GetDlgItem(hwndDlg, ID_RB_PROXY_SOCKS), TRUE);
EnableWindow(GetDlgItem(hwndDlg, ID_EDT_PROXY_ADDRESS), TRUE);
EnableWindow(GetDlgItem(hwndDlg, ID_EDT_PROXY_PORT), TRUE);
EnableWindow(GetDlgItem(hwndDlg, ID_TXT_PROXY_ADDRESS), TRUE);
EnableWindow(GetDlgItem(hwndDlg, ID_TXT_PROXY_PORT), TRUE);
}
break;
case ID_RB_PROXY_HTTP:
if (HIWORD(wParam) == BN_CLICKED)
{
SetDlgItemText(hwndDlg, ID_EDT_PROXY_ADDRESS, o.proxy_http_address);
SetDlgItemText(hwndDlg, ID_EDT_PROXY_PORT, o.proxy_http_port);
}
break;
case ID_RB_PROXY_SOCKS:
if (HIWORD(wParam) == BN_CLICKED)
{
SetDlgItemText(hwndDlg, ID_EDT_PROXY_ADDRESS, o.proxy_socks_address);
SetDlgItemText(hwndDlg, ID_EDT_PROXY_PORT, o.proxy_socks_port);
}
break;
}
break;
case WM_NOTIFY:
psn = (LPPSHNOTIFY) lParam;
if (psn->hdr.code == (UINT) PSN_KILLACTIVE)
{
SetWindowLongPtr(hwndDlg, DWLP_MSGRESULT, (CheckProxySettings(hwndDlg) ? FALSE : TRUE));
return TRUE;
}
else if (psn->hdr.code == (UINT) PSN_APPLY)
{
SaveProxySettings(hwndDlg);
SetWindowLongPtr(hwndDlg, DWLP_MSGRESULT, PSNRET_NOERROR);
return TRUE;
}
break;
case WM_CLOSE:
EndDialog(hwndDlg, LOWORD(wParam));
return TRUE;
}
return FALSE;
}
/* Check that proxy settings are valid */
int
CheckProxySettings(HWND hwndDlg)
{
if (IsDlgButtonChecked(hwndDlg, ID_RB_PROXY_MANUAL) == BST_CHECKED)
{
TCHAR text[100];
BOOL http = (IsDlgButtonChecked(hwndDlg, ID_RB_PROXY_HTTP) == BST_CHECKED);
GetDlgItemText(hwndDlg, ID_EDT_PROXY_ADDRESS, text, _countof(text));
if (_tcslen(text) == 0)
{
/* proxy address not specified */
ShowLocalizedMsg((http ? IDS_ERR_HTTP_PROXY_ADDRESS : IDS_ERR_SOCKS_PROXY_ADDRESS));
return 0;
}
GetDlgItemText(hwndDlg, ID_EDT_PROXY_PORT, text, _countof(text));
if (_tcslen(text) == 0)
{
/* proxy port not specified */
ShowLocalizedMsg((http ? IDS_ERR_HTTP_PROXY_PORT : IDS_ERR_SOCKS_PROXY_PORT));
return 0;
}
long port = _tcstol(text, NULL, 10);
if ((port < 1) || (port > 65535))
{
/* proxy port range error */
ShowLocalizedMsg((http ? IDS_ERR_HTTP_PROXY_PORT_RANGE : IDS_ERR_SOCKS_PROXY_PORT_RANGE));
return 0;
}
}
return 1;
}
void
LoadProxySettings(HWND hwndDlg)
{
/* Set Proxy type, address and port */
if (o.proxy_type == http)
{
CheckRadioButton(hwndDlg, ID_RB_PROXY_HTTP, ID_RB_PROXY_SOCKS, ID_RB_PROXY_HTTP);
SetDlgItemText(hwndDlg, ID_EDT_PROXY_ADDRESS, o.proxy_http_address);
SetDlgItemText(hwndDlg, ID_EDT_PROXY_PORT, o.proxy_http_port);
}
else if (o.proxy_type == socks)
{
CheckRadioButton(hwndDlg, ID_RB_PROXY_HTTP, ID_RB_PROXY_SOCKS, ID_RB_PROXY_SOCKS);
SetDlgItemText(hwndDlg, ID_EDT_PROXY_ADDRESS, o.proxy_socks_address);
SetDlgItemText(hwndDlg, ID_EDT_PROXY_PORT, o.proxy_socks_port);
}
/* Set Proxy Settings Source */
if (o.proxy_source == config)
{
SendMessage(GetDlgItem(hwndDlg, ID_RB_PROXY_OPENVPN), BM_CLICK, 0, 0);
}
else if (o.proxy_source == windows)
{
SendMessage(GetDlgItem(hwndDlg, ID_RB_PROXY_MSIE), BM_CLICK, 0, 0);
}
else if (o.proxy_source == manual)
{
SendMessage(GetDlgItem(hwndDlg, ID_RB_PROXY_MANUAL), BM_CLICK, 0, 0);
}
}
void
SaveProxySettings(HWND hwndDlg)
{
HKEY regkey;
DWORD dwDispos;
TCHAR proxy_source_string[2] = _T("0");
TCHAR proxy_type_string[2] = _T("0");
/* Save Proxy Settings Source */
if (IsDlgButtonChecked(hwndDlg, ID_RB_PROXY_OPENVPN) == BST_CHECKED)
{
o.proxy_source = config;
proxy_source_string[0] = _T('0');
}
else if (IsDlgButtonChecked(hwndDlg, ID_RB_PROXY_MSIE) == BST_CHECKED)
{
o.proxy_source = windows;
proxy_source_string[0] = _T('1');
}
else if (IsDlgButtonChecked(hwndDlg, ID_RB_PROXY_MANUAL) == BST_CHECKED)
{
o.proxy_source = manual;
proxy_source_string[0] = _T('2');
}
/* Save Proxy type, address and port */
if (IsDlgButtonChecked(hwndDlg, ID_RB_PROXY_HTTP) == BST_CHECKED)
{
o.proxy_type = http;
proxy_type_string[0] = _T('0');
GetDlgItemText(hwndDlg, ID_EDT_PROXY_ADDRESS, o.proxy_http_address,
_countof(o.proxy_http_address));
GetDlgItemText(hwndDlg, ID_EDT_PROXY_PORT, o.proxy_http_port,
_countof(o.proxy_http_port));
}
else
{
o.proxy_type = socks;
proxy_type_string[0] = _T('1');
GetDlgItemText(hwndDlg, ID_EDT_PROXY_ADDRESS, o.proxy_socks_address,
_countof(o.proxy_socks_address));
GetDlgItemText(hwndDlg, ID_EDT_PROXY_PORT, o.proxy_socks_port,
_countof(o.proxy_socks_port));
}
/* Open Registry for writing */
if (RegCreateKeyEx(HKEY_CURRENT_USER, GUI_REGKEY_HKCU, 0, _T(""), REG_OPTION_NON_VOLATILE,
KEY_WRITE, NULL, &regkey, &dwDispos) != ERROR_SUCCESS)
{
/* error creating Registry-Key */
ShowLocalizedMsg(IDS_ERR_CREATE_REG_HKCU_KEY, GUI_REGKEY_HKCU);
return;
}
/* Save Settings to registry */
SetRegistryValue(regkey, _T("proxy_source"), proxy_source_string);
SetRegistryValue(regkey, _T("proxy_type"), proxy_type_string);
SetRegistryValue(regkey, _T("proxy_http_address"), o.proxy_http_address);
SetRegistryValue(regkey, _T("proxy_http_port"), o.proxy_http_port);
SetRegistryValue(regkey, _T("proxy_socks_address"), o.proxy_socks_address);
SetRegistryValue(regkey, _T("proxy_socks_port"), o.proxy_socks_port);
RegCloseKey(regkey);
}
void
GetProxyRegistrySettings()
{
LONG status;
HKEY regkey;
TCHAR proxy_source_string[2] = _T("0");
TCHAR proxy_type_string[2] = _T("0");
/* Open Registry for reading */
status = RegOpenKeyEx(HKEY_CURRENT_USER, GUI_REGKEY_HKCU, 0, KEY_READ, &regkey);
if (status != ERROR_SUCCESS)
return;
/* get registry settings */
GetRegistryValue(regkey, _T("proxy_http_address"), o.proxy_http_address, _countof(o.proxy_http_address));
GetRegistryValue(regkey, _T("proxy_http_port"), o.proxy_http_port, _countof(o.proxy_http_port));
GetRegistryValue(regkey, _T("proxy_socks_address"), o.proxy_socks_address, _countof(o.proxy_socks_address));
GetRegistryValue(regkey, _T("proxy_socks_port"), o.proxy_socks_port, _countof(o.proxy_socks_port));
GetRegistryValue(regkey, _T("proxy_source"), proxy_source_string, _countof(proxy_source_string));
GetRegistryValue(regkey, _T("proxy_type"), proxy_type_string, _countof(proxy_type_string));
if (proxy_source_string[0] == _T('0'))
{
o.proxy_source = config;
}
else if (proxy_source_string[0] == _T('1'))
{
o.proxy_source = windows;
}
else if (proxy_source_string[0] == _T('2'))
{
o.proxy_source = manual;
}
o.proxy_type = (proxy_type_string[0] == _T('0') ? http : socks);
RegCloseKey(regkey);
}
static INT_PTR CALLBACK
ProxyAuthDialogFunc(HWND hwndDlg, UINT msg, WPARAM wParam, LPARAM lParam)
{
LPCSTR proxy_type;
connection_t *c;
char fmt[32];
switch (msg)
{
case WM_INITDIALOG:
/* Set connection for this dialog */
SetProp(hwndDlg, cfgProp, (HANDLE) lParam);
SetForegroundWindow(hwndDlg);
break;
case WM_COMMAND:
switch (LOWORD(wParam))
{
case ID_EDT_PROXY_USER:
if (HIWORD(wParam) == EN_UPDATE)
{
int len = Edit_GetTextLength((HWND) lParam);
EnableWindow(GetDlgItem(hwndDlg, IDOK), (len ? TRUE : FALSE));
}
break;
case IDOK:
c = (connection_t *) GetProp(hwndDlg, cfgProp);
proxy_type = (c->proxy_type == http ? "HTTP" : "SOCKS");
snprintf(fmt, sizeof(fmt), "username \"%s Proxy\" \"%%s\"", proxy_type);
ManagementCommandFromInput(c, fmt, hwndDlg, ID_EDT_PROXY_USER);
snprintf(fmt, sizeof(fmt), "password \"%s Proxy\" \"%%s\"", proxy_type);
ManagementCommandFromInput(c, fmt, hwndDlg, ID_EDT_PROXY_PASS);
EndDialog(hwndDlg, LOWORD(wParam));
return TRUE;
}
break;
case WM_CLOSE:
EndDialog(hwndDlg, LOWORD(wParam));
return TRUE;
case WM_NCDESTROY:
RemoveProp(hwndDlg, cfgProp);
break;
}
return FALSE;
}
void
QueryProxyAuth(connection_t *c, proxy_t type)
{
c->proxy_type = type;
LocalizedDialogBoxParam(ID_DLG_PROXY_AUTH, ProxyAuthDialogFunc, (LPARAM) c);
}
typedef enum { HTTPS_URL, SOCKS_URL } url_scheme;
static LPCWSTR
UrlSchemeStr(const url_scheme scheme)
{
static LPCWSTR scheme_strings[] = { L"https", L"socks" };
return scheme_strings[scheme];
}
static LPWSTR
QueryWindowsProxySettings(const url_scheme scheme, LPCSTR host)
{
LPWSTR proxy = NULL;
BOOL auto_detect = TRUE;
LPWSTR auto_config_url = NULL;
WINHTTP_CURRENT_USER_IE_PROXY_CONFIG proxy_config;
if (WinHttpGetIEProxyConfigForCurrentUser(&proxy_config))
{
proxy = proxy_config.lpszProxy;
auto_detect = proxy_config.fAutoDetect;
auto_config_url = proxy_config.lpszAutoConfigUrl;
GlobalFree(proxy_config.lpszProxyBypass);
}
if (auto_detect)
{
LPWSTR old_url = auto_config_url;
DWORD flags = WINHTTP_AUTO_DETECT_TYPE_DHCP | WINHTTP_AUTO_DETECT_TYPE_DNS_A;
if (WinHttpDetectAutoProxyConfigUrl(flags, &auto_config_url))
GlobalFree(old_url);
}
if (auto_config_url)
{
HINTERNET session = WinHttpOpen(NULL, WINHTTP_ACCESS_TYPE_NO_PROXY,
WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0);
if (session)
{
int size = _snwprintf(NULL, 0, L"%s://%S", UrlSchemeStr(scheme), host) + 1;
LPWSTR url = malloc(size * sizeof(WCHAR));
if (url)
{
_snwprintf(url, size, L"%s://%S", UrlSchemeStr(scheme), host);
LPWSTR old_proxy = proxy;
WINHTTP_PROXY_INFO proxy_info;
WINHTTP_AUTOPROXY_OPTIONS options = {
.fAutoLogonIfChallenged = TRUE,
.dwFlags = WINHTTP_AUTOPROXY_CONFIG_URL,
.lpszAutoConfigUrl = auto_config_url,
.dwAutoDetectFlags = 0,
.lpvReserved = NULL,
.dwReserved = 0
};
if (WinHttpGetProxyForUrl(session, url, &options, &proxy_info))
{
GlobalFree(old_proxy);
GlobalFree(proxy_info.lpszProxyBypass);
proxy = proxy_info.lpszProxy;
}
free(url);
}
WinHttpCloseHandle(session);
}
GlobalFree(auto_config_url);
}
return proxy;
}
static VOID
ParseProxyString(LPWSTR proxy_str, url_scheme scheme,
LPCSTR *type, LPCWSTR *host, LPCWSTR *port)
{
LPCWSTR delim = L"; ";
LPWSTR token = wcstok(proxy_str, delim);
LPCWSTR scheme_str = UrlSchemeStr(scheme);
LPCWSTR socks_str = UrlSchemeStr(SOCKS_URL);
/* Token format: [<scheme>=][<scheme>"://"]<server>[":"<port>] */
while (token)
{
BOOL match = FALSE;
LPWSTR eq = wcschr(token, '=');
LPWSTR css = wcsstr(token, L"://");
/*
* If the token has a <scheme>, test for the one we're looking for.
* If we're looking for a https proxy, socks will also do.
* If it's a proxy without a <scheme> it's only good for https.
*/
if (eq || css)
{
if (wcsbegins(token, scheme_str))
{
match = TRUE;
}
else if (scheme == HTTPS_URL && wcsbegins(token, socks_str))
{
match = TRUE;
scheme = SOCKS_URL;
}
}
else if (scheme == HTTPS_URL)
{
match = TRUE;
}
if (match)
{
LPWSTR server = token;
if (css)
server = css + 3;
else if (eq)
server = eq + 1;
/* IPv6 addresses are surrounded by brackets */
LPWSTR port_delim;
if (server[0] == '[')
{
server += 1;
LPWSTR end = wcschr(server, ']');
if (end == NULL)
continue;
*end++ = '\0';
port_delim = (*end == ':' ? end : NULL);
}
else
{
port_delim = wcsrchr(server, ':');
if (port_delim)
*port_delim = '\0';
}
*type = (scheme == HTTPS_URL ? "HTTP" : "SOCKS");
*host = server;
if (port_delim)
*port = port_delim + 1;
else
*port = (scheme == HTTPS_URL ? L"80": L"1080");
break;
}
token = wcstok(NULL, delim);
}
}
/*
* Respond to management interface PROXY notifications
* Input format: REMOTE_NO,PROTOCOL,HOST
*/
void
OnProxy(connection_t *c, char *line)
{
LPSTR proto, host;
char *pos = strchr(line, ',');
if (pos == NULL)
return;
proto = ++pos;
pos = strchr(pos, ',');
if (pos == NULL)
return;
*pos = '\0';
host = ++pos;
if (host[0] == '\0')
return;
LPCSTR type = "NONE";
LPCWSTR addr = L"", port = L"";
LPWSTR proxy_str = NULL;
if (o.proxy_source == manual)
{
if (o.proxy_type == http && streq(proto, "TCP"))
{
type = "HTTP";
addr = o.proxy_http_address;
port = o.proxy_http_port;
}
else if (o.proxy_type == socks)
{
type = "SOCKS";
addr = o.proxy_socks_address;
port = o.proxy_socks_port;
}
}
else if (o.proxy_source == windows)
{
url_scheme scheme = (streq(proto, "TCP") ? HTTPS_URL : SOCKS_URL);
proxy_str = QueryWindowsProxySettings(scheme, host);
ParseProxyString(proxy_str, scheme, &type, &addr, &port);
}
char cmd[128];
snprintf(cmd, sizeof(cmd), "proxy %s %S %S", type, addr, port);
cmd[sizeof(cmd) - 1] = '\0';
ManagementCommand(c, cmd, NULL, regular);
GlobalFree(proxy_str);
}