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openvpn.c
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openvpn.c
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/*
* OpenVPN-GUI -- A Windows GUI for OpenVPN.
*
* Copyright (C) 2004 Mathias Sundman <[email protected]>
* 2010 Heiko Hund <[email protected]>
* 2016 Selva Nair <[email protected]>
*
* 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 <versionhelpers.h>
#include <tchar.h>
#include <stdlib.h>
#include <stdio.h>
#include <process.h>
#include <richedit.h>
#include <time.h>
#include <commctrl.h>
#ifndef WM_DPICHANGED
#define WM_DPICHANGED 0x02E0
#endif
#include "tray.h"
#include "main.h"
#include "openvpn.h"
#include "openvpn_config.h"
#include "openvpn-gui-res.h"
#include "options.h"
#include "scripts.h"
#include "viewlog.h"
#include "proxy.h"
#include "passphrase.h"
#include "localization.h"
#include "misc.h"
#include "access.h"
#include "save_pass.h"
#include "env_set.h"
extern options_t o;
static BOOL
TerminateOpenVPN(connection_t *c);
const TCHAR *cfgProp = _T("conn");
#define FLAG_CR_TYPE_SCRV1 0x1 /* static challenege */
#define FLAG_CR_TYPE_CRV1 0x2 /* dynamic challenege */
#define FLAG_CR_ECHO 0x4 /* echo the response */
#define FLAG_CR_RESPONSE 0x8 /* response needed */
#define FLAG_PASS_TOKEN 0x10 /* PKCS11 token password needed */
#define FLAG_STRING_PKCS11 0x20 /* PKCS11 id needed */
#define FLAG_PASS_PKEY 0x40 /* Private key password needed */
typedef struct {
connection_t *c;
unsigned int flags;
char *str;
char *id;
char *user;
} auth_param_t;
static void
free_auth_param (auth_param_t *param)
{
if (!param)
return;
free (param->str);
free (param->id);
free (param->user);
free (param);
}
void
AppendTextToCaption (HANDLE hwnd, const WCHAR *str)
{
WCHAR old[256];
WCHAR new[256];
GetWindowTextW (hwnd, old, _countof(old));
_sntprintf_0 (new, L"%s (%s)", old, str);
SetWindowText (hwnd, new);
}
/*
* Show an error tooltip with msg attached to the specified
* editbox handle.
*/
static void
show_error_tip(HWND editbox, const WCHAR *msg)
{
EDITBALLOONTIP bt;
bt.cbStruct = sizeof(EDITBALLOONTIP);
bt.pszText = msg;
bt.pszTitle = L"Invalid input";
bt.ttiIcon = TTI_ERROR_LARGE;
SendMessage(editbox, EM_SHOWBALLOONTIP, 0, (LPARAM)&bt);
}
/*
* Receive banner on connection to management interface
* Format: <BANNER>
*/
void
OnReady(connection_t *c, UNUSED char *msg)
{
ManagementCommand(c, "state on", NULL, regular);
ManagementCommand(c, "log all on", OnLogLine, combined);
ManagementCommand(c, "echo all on", OnEcho, combined);
ManagementCommand(c, "bytecount 5", NULL, regular);
}
/*
* Handle the request to release a hold from the OpenVPN management interface
*/
void
OnHold(connection_t *c, UNUSED char *msg)
{
ManagementCommand(c, "hold off", NULL, regular);
ManagementCommand(c, "hold release", NULL, regular);
}
/*
* Handle a log line from the OpenVPN management interface
* Format <TIMESTAMP>,<FLAGS>,<MESSAGE>
*/
void
OnLogLine(connection_t *c, char *line)
{
HWND logWnd = GetDlgItem(c->hwndStatus, ID_EDT_LOG);
char *flags, *message;
time_t timestamp;
TCHAR *datetime;
const SETTEXTEX ste = {
.flags = ST_SELECTION,
.codepage = CP_UTF8
};
flags = strchr(line, ',') + 1;
if (flags - 1 == NULL)
return;
message = strchr(flags, ',') + 1;
if (message - 1 == NULL)
return;
size_t flag_size = message - flags - 1; /* message is always > flags */
/* Remove lines from log window if it is getting full */
if (SendMessage(logWnd, EM_GETLINECOUNT, 0, 0) > MAX_LOG_LINES)
{
int pos = SendMessage(logWnd, EM_LINEINDEX, DEL_LOG_LINES, 0);
SendMessage(logWnd, EM_SETSEL, 0, pos);
SendMessage(logWnd, EM_REPLACESEL, FALSE, (LPARAM) _T(""));
}
timestamp = strtol(line, NULL, 10);
datetime = _tctime(×tamp);
datetime[24] = _T(' ');
/* deselect current selection, if any */
SendMessage(logWnd, EM_SETSEL, (WPARAM) -1, (LPARAM) -1);
/* change text color if Warning or Error */
COLORREF text_clr = 0;
if (memchr(flags, 'N', flag_size) || memchr(flags, 'F', flag_size))
text_clr = o.clr_error;
else if (memchr(flags, 'W', flag_size))
text_clr = o.clr_warning;
if (text_clr != 0)
{
CHARFORMAT cfm = { .cbSize = sizeof(CHARFORMAT),
.dwMask = CFM_COLOR|CFM_BOLD,
.dwEffects = 0,
.crTextColor = text_clr,
};
SendMessage(logWnd, EM_SETCHARFORMAT, SCF_SELECTION, (LPARAM) &cfm);
}
/* Append line to log window */
SendMessage(logWnd, EM_REPLACESEL, FALSE, (LPARAM) datetime);
SendMessage(logWnd, EM_SETTEXTEX, (WPARAM) &ste, (LPARAM) message);
SendMessage(logWnd, EM_REPLACESEL, FALSE, (LPARAM) _T("\n"));
}
/* expect ipv4,remote,port,,,ipv6 */
static void
parse_assigned_ip(connection_t *c, const char *msg)
{
char *sep;
CLEAR(c->ip);
CLEAR(c->ipv6);
/* extract local ipv4 address if available*/
sep = strchr(msg, ',');
if (sep == NULL)
return;
/* Convert the IP address to Unicode */
if (sep - msg > 0
&& MultiByteToWideChar(CP_UTF8, 0, msg, sep-msg, c->ip, _countof(c->ip)-1) == 0)
{
WriteStatusLog(c, L"GUI> ", L"Failed to extract the assigned ipv4 address (error = %d)",
GetLastError());
c->ip[0] = L'\0';
}
/* extract local ipv6 address if available */
/* skip 4 commas */
for (int i = 0; i < 4 && sep; i++)
{
sep = strchr(sep + 1, ',');
}
if (!sep)
return;
sep++; /* start of ipv6 address */
/* Convert the IP address to Unicode */
if (MultiByteToWideChar(CP_UTF8, 0, sep, -1, c->ipv6, _countof(c->ipv6)-1) == 0)
{
WriteStatusLog(c, L"GUI> ", L"Failed to extract the assigned ipv6 address (error = %d)",
GetLastError());
c->ipv6[0] = L'\0';
}
}
/*
* Handle a state change notification from the OpenVPN management interface
* Format <TIMESTAMP>,<STATE>,[<MESSAGE>],[<LOCAL_IP>][,<REMOTE_IP>]
*/
void
OnStateChange(connection_t *c, char *data)
{
char *pos, *state, *message;
pos = strchr(data, ',');
if (pos == NULL)
return;
*pos = '\0';
state = pos + 1;
pos = strchr(state, ',');
if (pos == NULL)
return;
*pos = '\0';
message = pos + 1;
pos = strchr(message, ',');
if (pos == NULL)
return;
*pos = '\0';
if (strcmp(state, "CONNECTED") == 0)
{
parse_assigned_ip(c, pos + 1);
}
if (strcmp(state, "CONNECTED") == 0 && strcmp(message, "SUCCESS") == 0)
{
/* concatenate ipv4 and ipv6 addresses into one string */
WCHAR ip_txt[256];
WCHAR ip[64];
wcs_concat2(ip, _countof(ip), c->ip, c->ipv6, L", ");
LoadLocalizedStringBuf(ip_txt, _countof(ip_txt), IDS_NFO_ASSIGN_IP, ip);
/* Run Connect Script */
if (c->state == connecting || c->state == resuming)
RunConnectScript(c, false);
/* Show connection tray balloon */
if ((c->state == connecting && o.show_balloon != 0)
|| (c->state == resuming && o.show_balloon != 0)
|| (c->state == reconnecting && o.show_balloon == 2))
{
TCHAR msg[256];
LoadLocalizedStringBuf(msg, _countof(msg), IDS_NFO_NOW_CONNECTED, c->config_name);
ShowTrayBalloon(msg, (ip[0] ? ip_txt : _T("")));
}
/* Save time when we got connected. */
c->connected_since = atoi(data);
c->failed_psw_attempts = 0;
c->failed_auth_attempts = 0;
c->state = connected;
SetMenuStatus(c, connected);
SetTrayIcon(connected);
SetDlgItemText(c->hwndStatus, ID_TXT_STATUS, LoadLocalizedString(IDS_NFO_STATE_CONNECTED));
SetDlgItemTextW(c->hwndStatus, ID_TXT_IP, ip_txt);
SetStatusWinIcon(c->hwndStatus, ID_ICO_CONNECTED);
/* Hide Status Window */
ShowWindow(c->hwndStatus, SW_HIDE);
}
else if (strcmp(state, "RECONNECTING") == 0)
{
if (!c->dynamic_cr)
{
if (strcmp(message, "auth-failure") == 0)
c->failed_auth_attempts++;
else if (strcmp(message, "private-key-password-failure") == 0)
c->failed_psw_attempts++;
}
c->state = reconnecting;
CheckAndSetTrayIcon();
SetDlgItemText(c->hwndStatus, ID_TXT_STATUS, LoadLocalizedString(IDS_NFO_STATE_RECONNECTING));
SetDlgItemTextW(c->hwndStatus, ID_TXT_IP, L"");
SetStatusWinIcon(c->hwndStatus, ID_ICO_CONNECTING);
}
}
static void
SimulateButtonPress(HWND hwnd, UINT btn)
{
SendMessage(hwnd, WM_COMMAND, MAKEWPARAM(btn, BN_CLICKED), (LPARAM)GetDlgItem(hwnd, btn));
}
/* A private struct to keep autoclose parameters */
typedef struct autoclose {
UINT start; /* start time in msec */
UINT timeout; /* timeout in msec at which autoclose triggers */
UINT btn; /* button which is 'pressed' for autoclose */
UINT txtid; /* id of a text control to display an informaltional message */
UINT txtres; /* resource id of localized text to use for message:
LoadLocalizedString(txtid, time_remaining_in_seconds)
is used to generate the message */
COLORREF txtclr; /* color for message text */
} autoclose;
/* Cancel scheduled auto close of a dialog */
static void
AutoCloseCancel(HWND hwnd)
{
autoclose *ac = (autoclose *)GetProp(hwnd, L"AutoClose");
if (!ac)
return;
if (ac->txtid)
SetDlgItemText(hwnd, ac->txtid, L"");
KillTimer(hwnd, 1);
RemoveProp(hwnd, L"AutoClose");
free(ac);
}
/* Called when autoclose timer expires. */
static void CALLBACK
AutoCloseHandler(HWND hwnd, UINT UNUSED msg, UINT_PTR id, DWORD now)
{
autoclose *ac = (autoclose *)GetProp(hwnd, L"AutoClose");
if (!ac)
return;
UINT end = ac->start + ac->timeout;
if (now >= end)
{
SimulateButtonPress(hwnd, ac->btn);
AutoCloseCancel(hwnd);
}
else
{
SetDlgItemText(hwnd, ac->txtid, LoadLocalizedString(ac->txtres, (end - now)/1000));
SetTimer(hwnd, id, 500, AutoCloseHandler);
}
}
/* Schedule an event to automatically activate specified btn after timeout seconds.
* Used for automatically closing a dialog after some delay unless user interrupts.
* Optionally a txtid and txtres resource may be specified to display a message.
* %u in the message is replaced by time remaining before timeout will trigger.
* Call AutoCloseCancel to cancel the scheduled event and clear the displayed
* text.
*/
static void
AutoCloseSetup(HWND hwnd, UINT btn, UINT timeout, UINT txtid, UINT txtres)
{
if (timeout == 0)
SimulateButtonPress(hwnd, btn);
else
{
autoclose *ac = GetPropW(hwnd, L"AutoClose"); /* reuse if set */
if (!ac && (ac = malloc(sizeof(autoclose))) == NULL)
return;
*ac = (autoclose) {.start = GetTickCount(), .timeout = timeout*1000, .btn = btn,
.txtid = txtid, .txtres = txtres, .txtclr = GetSysColor(COLOR_WINDOWTEXT)};
SetTimer(hwnd, 1, 500, AutoCloseHandler); /* using timer id = 1 */
if (txtid && txtres)
SetDlgItemText(hwnd, txtid, LoadLocalizedString(txtres, timeout));
SetPropW(hwnd, L"AutoClose", (HANDLE) ac);
}
}
/*
* DialogProc for OpenVPN username/password/challenge auth dialog windows
*/
INT_PTR CALLBACK
UserAuthDialogFunc(HWND hwndDlg, UINT msg, WPARAM wParam, LPARAM lParam)
{
auth_param_t *param;
WCHAR username[USER_PASS_LEN] = L"";
WCHAR password[USER_PASS_LEN] = L"";
switch (msg)
{
case WM_INITDIALOG:
/* Set connection for this dialog and show it */
param = (auth_param_t *) lParam;
SetProp(hwndDlg, cfgProp, (HANDLE) param);
SetStatusWinIcon(hwndDlg, ID_ICO_APP);
if (param->str)
{
LPWSTR wstr = Widen (param->str);
HWND wnd_challenge = GetDlgItem(hwndDlg, ID_EDT_AUTH_CHALLENGE);
if (!wstr)
WriteStatusLog(param->c, L"GUI> ", L"Error converting challenge string to widechar", false);
else
SetDlgItemTextW(hwndDlg, ID_TXT_AUTH_CHALLENGE, wstr);
free(wstr);
/* Set/Remove style ES_PASSWORD by SetWindowLong(GWL_STYLE) does nothing,
send EM_SETPASSWORDCHAR just works. */
if (param->flags & FLAG_CR_ECHO)
SendMessage(wnd_challenge, EM_SETPASSWORDCHAR, 0, 0);
}
if (RecallUsername(param->c->config_name, username))
{
SetDlgItemTextW(hwndDlg, ID_EDT_AUTH_USER, username);
SetFocus(GetDlgItem(hwndDlg, ID_EDT_AUTH_PASS));
}
if (RecallAuthPass(param->c->config_name, password))
{
SetDlgItemTextW(hwndDlg, ID_EDT_AUTH_PASS, password);
if (username[0] != L'\0' && !(param->flags & FLAG_CR_TYPE_SCRV1)
&& password[0] != L'\0' && param->c->failed_auth_attempts == 0)
{
/* user/pass available and no challenge response needed: skip dialog
* if silent_connection is on, else auto submit after a few seconds.
* User can interrupt.
*/
SetFocus(GetDlgItem(hwndDlg, IDOK));
UINT timeout = o.silent_connection ? 0 : 6; /* in seconds */
AutoCloseSetup(hwndDlg, IDOK, timeout, ID_TXT_WARNING, IDS_NFO_AUTO_CONNECT);
}
/* if auth failed, highlight password so that user can type over */
else if (param->c->failed_auth_attempts)
{
SendMessage(GetDlgItem(hwndDlg, ID_EDT_AUTH_PASS), EM_SETSEL, 0, MAKELONG(0,-1));
}
else if (param->flags & FLAG_CR_TYPE_SCRV1)
{
SetFocus(GetDlgItem(hwndDlg, ID_EDT_AUTH_CHALLENGE));
}
SecureZeroMemory(password, sizeof(password));
}
if (param->c->flags & FLAG_DISABLE_SAVE_PASS)
ShowWindow(GetDlgItem (hwndDlg, ID_CHK_SAVE_PASS), SW_HIDE);
else if (param->c->flags & FLAG_SAVE_AUTH_PASS)
Button_SetCheck(GetDlgItem (hwndDlg, ID_CHK_SAVE_PASS), BST_CHECKED);
SetWindowText (hwndDlg, param->c->config_name);
if (param->c->failed_auth_attempts > 0)
SetDlgItemTextW(hwndDlg, ID_TXT_WARNING, LoadLocalizedString(IDS_NFO_AUTH_PASS_RETRY));
if (param->c->state == resuming)
ForceForegroundWindow(hwndDlg);
else
SetForegroundWindow(hwndDlg);
break;
case WM_LBUTTONDOWN:
case WM_RBUTTONDOWN:
case WM_NCLBUTTONDOWN:
case WM_NCRBUTTONDOWN:
/* user interrupt */
AutoCloseCancel(hwndDlg);
break;
case WM_COMMAND:
param = (auth_param_t *) GetProp(hwndDlg, cfgProp);
switch (LOWORD(wParam))
{
case ID_EDT_AUTH_USER:
if (HIWORD(wParam) == EN_UPDATE)
{
int len = Edit_GetTextLength((HWND) lParam);
EnableWindow(GetDlgItem(hwndDlg, IDOK), (len ? TRUE : FALSE));
}
AutoCloseCancel(hwndDlg); /* user interrupt */
break;
case ID_EDT_AUTH_PASS:
AutoCloseCancel(hwndDlg); /* user interrupt */
break;
case ID_CHK_SAVE_PASS:
param->c->flags ^= FLAG_SAVE_AUTH_PASS;
if (param->c->flags & FLAG_SAVE_AUTH_PASS)
Button_SetCheck(GetDlgItem (hwndDlg, ID_CHK_SAVE_PASS), BST_CHECKED);
else
{
DeleteSavedAuthPass(param->c->config_name);
Button_SetCheck(GetDlgItem (hwndDlg, ID_CHK_SAVE_PASS), BST_UNCHECKED);
}
AutoCloseCancel(hwndDlg); /* user interrupt */
break;
case IDOK:
if (GetDlgItemTextW(hwndDlg, ID_EDT_AUTH_USER, username, _countof(username)))
{
if (!validate_input(username, L"\n"))
{
show_error_tip(GetDlgItem(hwndDlg, ID_EDT_AUTH_USER), LoadLocalizedString(IDS_ERR_INVALID_USERNAME_INPUT));
return 0;
}
SaveUsername(param->c->config_name, username);
}
if (GetDlgItemTextW(hwndDlg, ID_EDT_AUTH_PASS, password, _countof(password)))
{
if (!validate_input(password, L"\n"))
{
show_error_tip(GetDlgItem(hwndDlg, ID_EDT_AUTH_PASS), LoadLocalizedString(IDS_ERR_INVALID_PASSWORD_INPUT));
SecureZeroMemory(password, sizeof(password));
return 0;
}
if ( param->c->flags & FLAG_SAVE_AUTH_PASS && wcslen(password) )
{
SaveAuthPass(param->c->config_name, password);
}
SecureZeroMemory(password, sizeof(password));
}
ManagementCommandFromInput(param->c, "username \"Auth\" \"%s\"", hwndDlg, ID_EDT_AUTH_USER);
if (param->flags & FLAG_CR_TYPE_SCRV1)
ManagementCommandFromInputBase64(param->c, "password \"Auth\" \"SCRV1:%s:%s\"", hwndDlg, ID_EDT_AUTH_PASS, ID_EDT_AUTH_CHALLENGE);
else
ManagementCommandFromInput(param->c, "password \"Auth\" \"%s\"", hwndDlg, ID_EDT_AUTH_PASS);
EndDialog(hwndDlg, LOWORD(wParam));
return TRUE;
case IDCANCEL:
EndDialog(hwndDlg, LOWORD(wParam));
StopOpenVPN(param->c);
return TRUE;
}
break;
case WM_CTLCOLORSTATIC:
if (GetDlgCtrlID((HWND) lParam) == ID_TXT_WARNING)
{
autoclose *ac = (autoclose *)GetProp(hwndDlg, L"AutoClose");
HBRUSH br = (HBRUSH) DefWindowProc(hwndDlg, msg, wParam, lParam);
/* This text id is used for auth failure warning or autoclose message. Use appropriate color */
COLORREF clr = o.clr_warning;
if (ac && ac->txtid == ID_TXT_WARNING)
clr = ac->txtclr;
SetTextColor((HDC) wParam, clr);
return (INT_PTR) br;
}
break;
case WM_CLOSE:
EndDialog(hwndDlg, LOWORD(wParam));
param = (auth_param_t *) GetProp(hwndDlg, cfgProp);
StopOpenVPN(param->c);
return TRUE;
case WM_NCDESTROY:
param = (auth_param_t *) GetProp(hwndDlg, cfgProp);
free_auth_param (param);
AutoCloseCancel(hwndDlg);
RemoveProp(hwndDlg, cfgProp);
break;
}
return FALSE;
}
/*
* DialogProc for challenge-response, token PIN etc.
*/
INT_PTR CALLBACK
GenericPassDialogFunc(HWND hwndDlg, UINT msg, WPARAM wParam, LPARAM lParam)
{
auth_param_t *param;
WCHAR password[USER_PASS_LEN];
switch (msg)
{
case WM_INITDIALOG:
param = (auth_param_t *) lParam;
SetProp(hwndDlg, cfgProp, (HANDLE) param);
WCHAR *wstr = Widen (param->str);
if (!wstr)
{
WriteStatusLog(param->c, L"GUI> ", L"Error converting challenge string to widechar", false);
EndDialog(hwndDlg, LOWORD(wParam));
break;
}
if (param->flags & FLAG_CR_TYPE_CRV1)
{
SetDlgItemTextW(hwndDlg, ID_TXT_DESCRIPTION, wstr);
/* Set password echo on if needed */
if (param->flags & FLAG_CR_ECHO)
SendMessage(GetDlgItem(hwndDlg, ID_EDT_RESPONSE), EM_SETPASSWORDCHAR, 0, 0);
}
else if (param->flags & FLAG_PASS_TOKEN)
{
SetWindowText(hwndDlg, LoadLocalizedString(IDS_NFO_TOKEN_PASSWORD_CAPTION));
SetDlgItemText(hwndDlg, ID_TXT_DESCRIPTION, LoadLocalizedString(IDS_NFO_TOKEN_PASSWORD_REQUEST, param->id));
}
else
{
WriteStatusLog(param->c, L"GUI> ", L"Unknown password request", false);
SetDlgItemText(hwndDlg, ID_TXT_DESCRIPTION, wstr);
}
free(wstr);
AppendTextToCaption (hwndDlg, param->c->config_name);
if (param->c->state == resuming)
ForceForegroundWindow(hwndDlg);
else
SetForegroundWindow(hwndDlg);
break;
case WM_COMMAND:
param = (auth_param_t *) GetProp(hwndDlg, cfgProp);
const char *template;
char *fmt;
switch (LOWORD(wParam))
{
case IDOK:
if (GetDlgItemTextW(hwndDlg, ID_EDT_RESPONSE, password, _countof(password))
&& !validate_input(password, L"\n"))
{
show_error_tip(GetDlgItem(hwndDlg, ID_EDT_RESPONSE), LoadLocalizedString(IDS_ERR_INVALID_PASSWORD_INPUT));
SecureZeroMemory(password, sizeof(password));
return 0;
}
if (param->flags & FLAG_CR_TYPE_CRV1)
{
/* send username */
template = "username \"Auth\" \"%s\"";
fmt = malloc(strlen(template) + strlen(param->user));
if (fmt)
{
sprintf(fmt, template, param->user);
ManagementCommand(param->c, fmt, NULL, regular);
free(fmt);
}
else /* no memory? send an emty username and let it error out */
{
WriteStatusLog(param->c, L"GUI> ",
L"Out of memory: sending a generic username for dynamic CR", false);
ManagementCommand(param->c, "username \"Auth\" \"user\"", NULL, regular);
}
/* password template */
template = "password \"Auth\" \"CRV1::%s::%%s\"";
}
else /* generic password request of type param->id */
{
template = "password \"%s\" \"%%s\"";
}
fmt = malloc(strlen(template) + strlen(param->id));
if (fmt)
{
sprintf(fmt, template, param->id);
PrintDebug(L"Send passwd to mgmt with format: '%S'", fmt);
ManagementCommandFromInput(param->c, fmt, hwndDlg, ID_EDT_RESPONSE);
free (fmt);
}
else /* no memory? send stop signal */
{
WriteStatusLog(param->c, L"GUI> ",
L"Out of memory in password dialog: sending stop signal", false);
StopOpenVPN (param->c);
}
EndDialog(hwndDlg, LOWORD(wParam));
return TRUE;
case IDCANCEL:
EndDialog(hwndDlg, LOWORD(wParam));
StopOpenVPN(param->c);
return TRUE;
}
break;
case WM_CLOSE:
EndDialog(hwndDlg, LOWORD(wParam));
return TRUE;
case WM_NCDESTROY:
param = (auth_param_t *) GetProp(hwndDlg, cfgProp);
free_auth_param (param);
RemoveProp(hwndDlg, cfgProp);
break;
}
return FALSE;
}
/*
* DialogProc for OpenVPN private key password dialog windows
*/
INT_PTR CALLBACK
PrivKeyPassDialogFunc(HWND hwndDlg, UINT msg, WPARAM wParam, LPARAM lParam)
{
connection_t *c;
WCHAR passphrase[KEY_PASS_LEN];
switch (msg)
{
case WM_INITDIALOG:
/* Set connection for this dialog and show it */
c = (connection_t *) lParam;
SetProp(hwndDlg, cfgProp, (HANDLE) c);
AppendTextToCaption (hwndDlg, c->config_name);
if (RecallKeyPass(c->config_name, passphrase) && wcslen(passphrase)
&& c->failed_psw_attempts == 0)
{
/* Use the saved password and skip the dialog */
SetDlgItemTextW(hwndDlg, ID_EDT_PASSPHRASE, passphrase);
SecureZeroMemory(passphrase, sizeof(passphrase));
ManagementCommandFromInput(c, "password \"Private Key\" \"%s\"", hwndDlg, ID_EDT_PASSPHRASE);
EndDialog(hwndDlg, IDOK);
return TRUE;
}
if (c->flags & FLAG_DISABLE_SAVE_PASS)
ShowWindow(GetDlgItem (hwndDlg, ID_CHK_SAVE_PASS), SW_HIDE);
else if (c->flags & FLAG_SAVE_KEY_PASS)
Button_SetCheck (GetDlgItem (hwndDlg, ID_CHK_SAVE_PASS), BST_CHECKED);
if (c->failed_psw_attempts > 0)
SetDlgItemTextW(hwndDlg, ID_TXT_WARNING, LoadLocalizedString(IDS_NFO_KEY_PASS_RETRY));
if (c->state == resuming)
ForceForegroundWindow(hwndDlg);
else
SetForegroundWindow(hwndDlg);
break;
case WM_COMMAND:
c = (connection_t *) GetProp(hwndDlg, cfgProp);
switch (LOWORD(wParam))
{
case ID_CHK_SAVE_PASS:
c->flags ^= FLAG_SAVE_KEY_PASS;
if (c->flags & FLAG_SAVE_KEY_PASS)
Button_SetCheck (GetDlgItem (hwndDlg, ID_CHK_SAVE_PASS), BST_CHECKED);
else
{
Button_SetCheck (GetDlgItem (hwndDlg, ID_CHK_SAVE_PASS), BST_UNCHECKED);
DeleteSavedKeyPass(c->config_name);
}
break;
case IDOK:
if (GetDlgItemTextW(hwndDlg, ID_EDT_PASSPHRASE, passphrase, _countof(passphrase)))
{
if (!validate_input(passphrase, L"\n"))
{
show_error_tip(GetDlgItem(hwndDlg, ID_EDT_PASSPHRASE), LoadLocalizedString(IDS_ERR_INVALID_PASSWORD_INPUT));
SecureZeroMemory(passphrase, sizeof(passphrase));
return 0;
}
if ((c->flags & FLAG_SAVE_KEY_PASS) && wcslen(passphrase) > 0)
{
SaveKeyPass(c->config_name, passphrase);
}
SecureZeroMemory(passphrase, sizeof(passphrase));
}
ManagementCommandFromInput(c, "password \"Private Key\" \"%s\"", hwndDlg, ID_EDT_PASSPHRASE);
EndDialog(hwndDlg, LOWORD(wParam));
return TRUE;
case IDCANCEL:
EndDialog(hwndDlg, LOWORD(wParam));
StopOpenVPN (c);
return TRUE;
}
break;
case WM_CTLCOLORSTATIC:
if (GetDlgCtrlID((HWND) lParam) == ID_TXT_WARNING)
{
HBRUSH br = (HBRUSH) DefWindowProc(hwndDlg, msg, wParam, lParam);
SetTextColor((HDC) wParam, o.clr_warning);
return (INT_PTR) br;
}
break;
case WM_CLOSE:
EndDialog(hwndDlg, LOWORD(wParam));
return TRUE;
case WM_NCDESTROY:
RemoveProp(hwndDlg, cfgProp);
break;
}
return FALSE;
}
static void
free_dynamic_cr (connection_t *c)
{
free (c->dynamic_cr);
c->dynamic_cr = NULL;
}
/*
* Parse dynamic challenge string received from the server. Returns
* true on success. The caller must free param->str and param->id
* even on error.
*/
static BOOL
parse_dynamic_cr (const char *str, auth_param_t *param)
{
BOOL ret = FALSE;
char *token[4] = {0};
char *p = strdup (str);
int i;
char *p1;
if (!param || !p) goto out;
/* expected: str = "E,R:challenge_id:user_b64:challenge_str" */
for (i = 0, p1 = p; i < 4; ++i, p1 = NULL)
{
token[i] = strtok (p1, ":"); /* strtok is thread-safe on Windows */
if (!token[i])
{
WriteStatusLog(param->c, L"GUI> ", L"Error parsing dynamic challenge string", false);
goto out;
}
}
if (Base64Decode(token[2], ¶m->user) < 0)
{
WriteStatusLog(param->c, L"GUI> ", L"Error decoding the username in dynamic challenge string", false);
goto out;
}
param->flags |= FLAG_CR_TYPE_CRV1;
param->flags |= strchr(token[0], 'E') ? FLAG_CR_ECHO : 0;
param->flags |= strchr(token[0], 'R') ? FLAG_CR_RESPONSE : 0;
param->id = strdup(token[1]);
param->str = strdup(token[3]);
if (!param->id || !param->str)
goto out;
ret = TRUE;
out:
free (p);
return ret;
}
/*
* Parse password or string request of the form "Need 'What' password/string MSG:message"
* and assign param->id = What, param->str = message. Also set param->flags if the type
* of the requested info is known. If message is empty param->id is copied to param->str.
* Return true on succsess. The caller must free param even when the function fails.
*/
static BOOL
parse_input_request (const char *msg, auth_param_t *param)
{
BOOL ret = FALSE;
char *p = strdup (msg);
char *sep[4] = {" ", "'", " ", ""}; /* separators to use to break up msg */
char *token[4];
char *p1 = p;
for (int i = 0; i < 4; ++i, p1 = NULL)
{
token[i] = strtok (p1, sep[i]); /* strtok is thread-safe on Windows */
if (!token[i] && i < 3) /* first three tokens required */
goto out;
}
if (token[3] && strncmp(token[3], "MSG:", 4) == 0)
token[3] += 4;
if (!token[3] || !*token[3]) /* use id as the description if none provided */
token[3] = token[1];
PrintDebug (L"Tokens: '%S' '%S' '%S' '%S'", token[0], token[1],
token[2], token[3]);
if (strcmp (token[0], "Need") != 0)
goto out;
if ((param->id = strdup(token[1])) == NULL)
goto out;
if (strcmp(token[2], "password") == 0)
{
if (strcmp (param->id, "Private Key") == 0)
param->flags |= FLAG_PASS_PKEY;
else
param->flags |= FLAG_PASS_TOKEN;
}
else if (strcmp(token[2], "string") == 0
&& strcmp (param->id, "pkcs11-id-request") == 0)
{
param->flags |= FLAG_STRING_PKCS11;
}
param->str = strdup (token[3]);
if (param->str == NULL)
goto out;
PrintDebug (L"parse_input_request: id = '%S' str = '%S' flags = %u",
param->id, param->str, param->flags);
ret = TRUE;
out:
free (p);
if (!ret)
PrintDebug (L"Error parsing password/string request msg: <%S>", msg);
return ret;
}
/*
* Handle >ECHO: request from OpenVPN management interface
* Expect msg = timestamp,message
*/
void
OnEcho(connection_t *c, char *msg)
{
time_t timestamp = strtoul(msg, NULL, 10); /* openvpn prints these as %u */
PrintDebug(L"OnEcho with msg = %S", msg);
if (!(msg = strchr(msg, ',')))
{
PrintDebug(L"OnEcho: msg format not recognized");
return;
}
msg++;
if (strcmp(msg, "forget-passwords") == 0)
{
DeleteSavedPasswords(c->config_name);
}
else if (strcmp(msg, "save-passwords") == 0)
{
if (c->flags & FLAG_DISABLE_SAVE_PASS)
WriteStatusLog(c, L"GUI> echo save-passwords: ",
L"Ignored as disable_save_passwords is enabled.", false);
else
c->flags |= (FLAG_SAVE_KEY_PASS | FLAG_SAVE_AUTH_PASS);
}
else if (strbegins(msg, "setenv "))
{
process_setenv(c, timestamp, msg);
}
else
{
wchar_t errmsg[256];
_sntprintf_0(errmsg, L"WARNING: Unknown ECHO directive '%hs' ignored.", msg);
WriteStatusLog(c, L"GUI> ", errmsg, false);
}
}
/*
* Handle >PASSWORD: request from OpenVPN management interface
*/
void
OnPassword(connection_t *c, char *msg)
{