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openvpn-gui/misc.c

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/*
* OpenVPN-GUI -- A Windows GUI for OpenVPN.
*
* Copyright (C) 2013 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 <wincrypt.h>
#include <tchar.h>
#include <string.h>
#include <stdlib.h>
#include <malloc.h>
#include <shellapi.h>
#include "options.h"
#include "manage.h"
#include "main.h"
#include "misc.h"
#include "main.h"
/*
* Helper function to do base64 conversion through CryptoAPI
* Returns TRUE on success, FALSE on error. Caller must free *output.
*/
BOOL
Base64Encode(const char *input, int input_len, char **output)
{
DWORD output_len;
DWORD flags = CRYPT_STRING_BASE64|CRYPT_STRING_NOCRLF;
if (input_len == 0)
{
/* set output to empty string -- matches the behavior in openvpn */
*output = calloc (1, sizeof(char));
return TRUE;
}
if (!CryptBinaryToStringA((const BYTE *) input, (DWORD) input_len,
flags, NULL, &output_len) || output_len == 0)
{
#ifdef DEBUG
PrintDebug (L"Error in CryptBinaryToStringA: input = '%.*S'", input_len, input);
#endif
*output = NULL;
return FALSE;
}
*output = (char *)malloc(output_len);
if (*output == NULL)
return FALSE;
if (!CryptBinaryToStringA((const BYTE *) input, (DWORD) input_len,
flags, *output, &output_len))
{
#ifdef DEBUG
PrintDebug (L"Error in CryptBinaryToStringA: input = '%.*S'", input_len, input);
#endif
free(*output);
*output = NULL;
return FALSE;
}
return TRUE;
}
/*
* Decode a nul-terminated base64 encoded input and save the result in
* an allocated buffer *output. The caller must free *output after use.
* The decoded output is nul-terminated so that the caller may treat
* it as a string when appropriate.
*
* Return the length of the decoded result (excluding nul) or -1 on
* error.
*/
int
Base64Decode(const char *input, char **output)
{
DWORD len;
PrintDebug (L"decoding %S", input);
if (!CryptStringToBinaryA(input, 0, CRYPT_STRING_BASE64_ANY,
NULL, &len, NULL, NULL) || len == 0)
{
*output = NULL;
return -1;
}
*output = malloc(len + 1);
if (*output == NULL)
return -1;
if (!CryptStringToBinaryA(input, 0,
CRYPT_STRING_BASE64, (BYTE *) *output, &len, NULL, NULL))
{
free(*output);
*output = NULL;
return -1;
}
/* NUL terminate output */
(*output)[len] = '\0';
PrintDebug (L"Decoded output %S", *output);
return len;
}
/*
* Helper function to convert UCS-2 text from a dialog item to UTF-8.
* Caller must free *str if *len != 0.
*/
static BOOL
GetDlgItemTextUtf8(HWND hDlg, int id, LPSTR *str, int *len)
{
int ucs2_len, utf8_len;
BOOL retval = FALSE;
LPTSTR ucs2_str = NULL;
LPSTR utf8_str = NULL;
*str = "";
*len = 0;
ucs2_len = GetWindowTextLength(GetDlgItem(hDlg, id)) + 1;
if (ucs2_len == 1)
goto out;
ucs2_str = malloc(ucs2_len * sizeof(*ucs2_str));
if (ucs2_str == NULL)
goto out;
if (GetDlgItemText(hDlg, id, ucs2_str, ucs2_len) == 0)
goto out;
utf8_len = WideCharToMultiByte(CP_UTF8, 0, ucs2_str, -1, NULL, 0, NULL, NULL);
utf8_str = malloc(utf8_len);
if (utf8_str == NULL)
goto out;
WideCharToMultiByte(CP_UTF8, 0, ucs2_str, -1, utf8_str, utf8_len, NULL, NULL);
*str = utf8_str;
*len = utf8_len - 1;
retval = TRUE;
out:
free(ucs2_str);
return retval;
}
/*
* Generate a management command from user input and send it
*/
BOOL
ManagementCommandFromInput(connection_t *c, LPCSTR fmt, HWND hDlg, int id)
{
BOOL retval = FALSE;
LPSTR input, cmd;
int input_len, cmd_len, pos;
GetDlgItemTextUtf8(hDlg, id, &input, &input_len);
/* Escape input if needed */
for (pos = 0; pos < input_len; ++pos)
{
if (input[pos] == '\\' || input[pos] == '"')
{
LPSTR buf = realloc(input, ++input_len + 1);
if (buf == NULL)
goto out;
input = buf;
memmove(input + pos + 1, input + pos, input_len - pos + 1);
input[pos] = '\\';
pos += 1;
}
}
cmd_len = input_len + strlen(fmt);
cmd = malloc(cmd_len);
if (cmd)
{
snprintf(cmd, cmd_len, fmt, input);
retval = ManagementCommand(c, cmd, NULL, regular);
free(cmd);
}
out:
/* Clear buffers with potentially secret content */
if (input_len)
{
memset(input, 'x', input_len);
SetDlgItemTextA(hDlg, id, input);
free(input);
}
return retval;
}
/*
* Generate a management command from double user inputs and send it
*/
BOOL
ManagementCommandFromTwoInputsBase64(connection_t *c, LPCSTR fmt, HWND hDlg,int id, int id2)
{
BOOL retval = FALSE;
LPSTR input, input2, input_b64, input2_b64, cmd;
int input_len, input2_len, cmd_len;
input_b64 = NULL;
input2_b64 = NULL;
GetDlgItemTextUtf8(hDlg, id, &input, &input_len);
GetDlgItemTextUtf8(hDlg, id2, &input2, &input2_len);
if (!Base64Encode(input, input_len, &input_b64))
goto out;
if (!Base64Encode(input2, input2_len, &input2_b64))
goto out;
cmd_len = strlen(input_b64) + strlen(input2_b64) + strlen(fmt);
cmd = malloc(cmd_len);
if (cmd)
{
snprintf(cmd, cmd_len, fmt, input_b64, input2_b64);
retval = ManagementCommand(c, cmd, NULL, regular);
free(cmd);
}
out:
/* Clear buffers with potentially secret content */
if (input_b64)
memset(input_b64, 0, strlen(input_b64));
if (input2_b64)
memset(input2_b64, 0, strlen(input2_b64));
free(input_b64);
free(input2_b64);
if (input_len)
{
memset(input, 'x', input_len);
SetDlgItemTextA(hDlg, id, input);
free(input);
}
if (input2_len)
{
memset(input2, 'x', input2_len);
SetDlgItemTextA(hDlg, id2, input2);
free(input2);
}
return retval;
}
/*
* Generate a management command from base64-encoded user inputs and send it
*/
BOOL
ManagementCommandFromInputBase64(connection_t* c, LPCSTR fmt, HWND hDlg, int id)
{
BOOL retval = FALSE;
LPSTR input, input_b64, cmd;
int input_len, cmd_len;
input_b64 = NULL;
GetDlgItemTextUtf8(hDlg, id, &input, &input_len);
if (!Base64Encode(input, input_len, &input_b64))
goto out;
cmd_len = strlen(input_b64) + strlen(fmt);
cmd = malloc(cmd_len);
if (cmd)
{
snprintf(cmd, cmd_len, fmt, input_b64);
retval = ManagementCommand(c, cmd, NULL, regular);
free(cmd);
}
out:
/* Clear buffers with potentially secret content */
if (input_b64)
memset(input_b64, 0, strlen(input_b64));
free(input_b64);
if (input_len)
{
memset(input, 'x', input_len);
SetDlgItemTextA(hDlg, id, input);
free(input);
}
return retval;
}
/*
* Ensures the given directory exists, by checking for and
* creating missing parts of the path.
* If the path does not exist and cannot be created return FALSE.
*/
BOOL
EnsureDirExists(LPTSTR dir)
{
DWORD attr = GetFileAttributes(dir);
if (attr == INVALID_FILE_ATTRIBUTES)
{
DWORD error = GetLastError();
if (error == ERROR_PATH_NOT_FOUND)
{
LPTSTR pos = _tcsrchr(dir, '\\');
if (pos == NULL)
return FALSE;
*pos = '\0';
BOOL ret = EnsureDirExists(dir);
*pos = '\\';
if (ret == FALSE)
return FALSE;
}
else if (error != ERROR_FILE_NOT_FOUND)
return FALSE;
/* No error if directory already exists */
return (CreateDirectory(dir, NULL) == TRUE
|| GetLastError() == ERROR_ALREADY_EXISTS);
}
return (attr & FILE_ATTRIBUTE_DIRECTORY ? TRUE : FALSE);
}
/*
* Various string helper functions
*/
BOOL
streq(LPCSTR str1, LPCSTR str2)
{
return (strcmp(str1, str2) == 0);
}
BOOL
strbegins(const char *str, const char *begin)
{
return (strncmp(str, begin, strlen(begin)) == 0);
}
BOOL
wcsbegins(LPCWSTR str, LPCWSTR begin)
{
return (wcsncmp(str, begin, wcslen(begin)) == 0);
}
/*
* Force setting window as foreground window by simulating an ALT keypress
*/
BOOL
ForceForegroundWindow(HWND hWnd)
{
BOOL ret = FALSE;
keybd_event(VK_MENU, 0, 0, 0);
ret = SetForegroundWindow(hWnd);
keybd_event(VK_MENU, 0, KEYEVENTF_KEYUP, 0);
return ret;
}
/*
* Set scale factor of windows in pixels. Scale = 100% for dpi = 96
*/
void
DpiSetScale(options_t* options, UINT dpix)
{
/* scale factor in percentage compared to the reference dpi of 96 */
if (dpix != 0)
options->dpi_scale = MulDiv(dpix, 100, 96);
else
options->dpi_scale = 100;
PrintDebug(L"DPI scale set to %u", options->dpi_scale);
}
/*
* Check user has admin rights
* Taken from https://msdn.microsoft.com/en-us/library/windows/desktop/aa376389(v=vs.85).aspx
* Returns true if the calling process token has the local Administrators group enabled
* in its SID. Assumes the caller is not impersonating and has access to open its own
* process token.
*/
BOOL IsUserAdmin(VOID)
{
BOOL b;
SID_IDENTIFIER_AUTHORITY NtAuthority = {SECURITY_NT_AUTHORITY};
PSID AdministratorsGroup;
b = AllocateAndInitializeSid (&NtAuthority, 2, SECURITY_BUILTIN_DOMAIN_RID,
DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0,
&AdministratorsGroup);
if(b)
{
if (!CheckTokenMembership(NULL, AdministratorsGroup, &b))
b = FALSE;
FreeSid(AdministratorsGroup);
}
return(b);
}
HANDLE
InitSemaphore (WCHAR *name)
{
HANDLE semaphore = NULL;
semaphore = CreateSemaphore (NULL, 1, 1, name);
if (!semaphore)
{
MessageBoxW (NULL, L"Error creating semaphore", TEXT(PACKAGE_NAME), MB_OK);
#ifdef DEBUG
PrintDebug (L"InitSemaphore: CreateSemaphore failed [error = %lu]", GetLastError());
#endif
}
return semaphore;
}
void
CloseSemaphore(HANDLE sem)
{
if (sem)
{
ReleaseSemaphore(sem, 1, NULL);
}
CloseHandle(sem);
}
/* Check access rights on an existing file */
BOOL
CheckFileAccess (const TCHAR *path, int access)
{
HANDLE h;
bool ret = FALSE;
h = CreateFile (path, access, FILE_SHARE_READ, NULL, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, NULL);
if ( h != INVALID_HANDLE_VALUE )
{
ret = TRUE;
CloseHandle (h);
}
return ret;
}
/*
* Convert a NUL terminated utf8 string to widechar. The caller must free
* the returned pointer. Return NULL on error.
*/
WCHAR *
Widen(const char *utf8)
{
WCHAR *wstr = NULL;
if (!utf8)
return wstr;
int nch = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, NULL, 0);
if (nch > 0)
wstr = malloc(sizeof(WCHAR) * nch);
if (wstr)
nch = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, wstr, nch);
if (nch == 0 && wstr)
{
free (wstr);
wstr = NULL;
}
return wstr;
}
/* Return false if input contains any characters in exclude */
BOOL
validate_input(const WCHAR *input, const WCHAR *exclude)
{
if (!exclude)
exclude = L"\n";
return (wcspbrk(input, exclude) == NULL);
}
/* Concatenate two wide strings with a separator -- if either string is empty separator not added */
void
wcs_concat2(WCHAR *dest, int len, const WCHAR *src1, const WCHAR *src2, const WCHAR *sep)
{
int n = 0;
if (!dest || len == 0)
return;
if (src1 && src2 && src1[0] && src2[0])
n = swprintf(dest, len, L"%s%s%s", src1, sep, src2);
else if (src1 && src1[0])
n = swprintf(dest, len, L"%s", src1);
else if (src2 && src2[0])
n = swprintf(dest, len, L"%s", src2);
if (n < 0 || n >= len) /*swprintf failed */
n = 0;
dest[n] = L'\0';
}
void
CloseHandleEx(LPHANDLE handle)
{
if (handle && *handle && *handle != INVALID_HANDLE_VALUE)
{
CloseHandle(*handle);
*handle = INVALID_HANDLE_VALUE;
}
}
/*
* Decode url encoded characters in buffer src and
* return the result in a newly allocated buffer. The
* caller should free the returned pointer. Returns
* NULL on memory allocation error.
*/
char *
url_decode(const char *src)
{
const char *s = src;
char *out = malloc(strlen(src) + 1); /* output is guaranteed to be not longer than src */
char *o;
if (!out)
return NULL;
for (o = out; *s; o++)
{
unsigned int c = *s++;
if (c == '%' && isxdigit(s[0]) && isxdigit(s[1]))
{
sscanf(s, "%2x", &c);
s += 2;
}
/* We passthough all other chars including % not followed by 2 hex digits */
*o = (char)c;
}
*o = '\0';
return out;
}
DWORD
md_init(md_ctx *ctx, ALG_ID hash_type)
{
DWORD status = 0;
if (!CryptAcquireContext(&ctx->prov, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
goto err;
if (!CryptCreateHash(ctx->prov, hash_type, 0, 0, &ctx->hash))
{
CryptReleaseContext(ctx->prov, 0);
goto err;
}
return status;
err:
status = GetLastError();
MsgToEventLog(EVENTLOG_ERROR_TYPE, L"Error in md_ctx_init: status = %lu", status);
return status;
}
DWORD
md_update(md_ctx *ctx, const BYTE *data, size_t size)
{
DWORD status = 0;
if (!CryptHashData(ctx->hash, data, (DWORD)size, 0))
{
status = GetLastError();
MsgToEventLog(EVENTLOG_ERROR_TYPE, L"Error in md_update: status = %lu", status);
}
return status;
}
DWORD
md_final(md_ctx *ctx, BYTE *md)
{
DWORD status = 0;
DWORD digest_len = HASHLEN;
if (!CryptGetHashParam(ctx->hash, HP_HASHVAL, md, &digest_len, 0))
{
status = GetLastError();
MsgToEventLog(EVENTLOG_ERROR_TYPE, L"Error in md_final: status = %lu", status);
}
CryptDestroyHash(ctx->hash);
CryptReleaseContext(ctx->prov, 0);
return status;
}
/* Open specified http/https URL using ShellExecute. */
BOOL
open_url(const wchar_t *url)
{
if (!url || !wcsbegins(url, L"http"))
{
return false;
}
HINSTANCE ret = ShellExecuteW(NULL, L"open", url, NULL, NULL, SW_SHOWNORMAL);
if (ret <= (HINSTANCE) 32)
{
MsgToEventLog(EVENTLOG_ERROR_TYPE, L"launch_url: ShellExecute <%s> returned error: %d", url, ret);
return false;
}
return true;
}