mirror of https://github.com/OpenVPN/openvpn-gui
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732 lines
18 KiB
732 lines
18 KiB
/*
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* OpenVPN-GUI -- A Windows GUI for OpenVPN.
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*
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* Copyright (C) 2004 Mathias Sundman <mathias@nilings.se>
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* 2010 Heiko Hund <heikoh@users.sf.net>
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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 2 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 (see the file COPYING included with this
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* distribution); if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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#ifndef DISABLE_CHANGE_PASSWORD
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#include <openssl/pem.h>
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#include <openssl/err.h>
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#include <openssl/pkcs12.h>
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#endif
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#include <windows.h>
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#include <wincrypt.h>
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#include "main.h"
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#include "options.h"
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#include "passphrase.h"
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#include "openvpn.h"
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#include "openvpn-gui-res.h"
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#include "chartable.h"
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#include "localization.h"
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#include "misc.h"
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extern options_t o;
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/*
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* Create a random password from the printable ASCII range
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*/
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BOOL
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GetRandomPassword(char *buf, size_t len)
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{
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HCRYPTPROV cp;
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BOOL retval = FALSE;
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unsigned i;
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if (!CryptAcquireContext(&cp, NULL, NULL, PROV_DSS, CRYPT_VERIFYCONTEXT))
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return FALSE;
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if (!CryptGenRandom(cp, len, (PBYTE) buf))
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goto out;
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/* Make sure all values are between 0x21 '!' and 0x7e '~' */
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for (i = 0; i < len; ++i)
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buf[i] = (buf[i] & 0x5d) + 0x21;
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retval = TRUE;
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out:
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CryptReleaseContext(cp, 0);
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return retval;
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}
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#ifndef DISABLE_CHANGE_PASSWORD
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const int KEYFILE_FORMAT_PKCS12 = 1;
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const int KEYFILE_FORMAT_PEM = 2;
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const int MIN_PASSWORD_LEN = 8;
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/*
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* Return TRUE if new passwords match
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*/
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static int
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ConfirmNewPassword(HWND hwndDlg)
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{
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TCHAR newpsw[50];
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TCHAR newpsw2[50];
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GetDlgItemText(hwndDlg, ID_EDT_PASS_NEW, newpsw, _countof(newpsw) - 1);
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GetDlgItemText(hwndDlg, ID_EDT_PASS_NEW2, newpsw2, _countof(newpsw2) - 1);
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if (_tcsncmp(newpsw, newpsw2, _countof(newpsw)) == 0)
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return true;
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else
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return false;
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}
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/*
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* Return lengh of the new password
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*/
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static int
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NewPasswordLengh(HWND hwndDlg)
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{
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TCHAR newpsw[50];
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GetDlgItemText(hwndDlg, ID_EDT_PASS_NEW, newpsw, _countof(newpsw) - 1);
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return (_tcslen(newpsw));
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}
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static int
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ConvertUnicode2Ascii(WCHAR str_unicode[], char str_ascii[], unsigned int str_ascii_size)
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{
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unsigned int i;
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unsigned int j;
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int illegal_chars = false;
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for (i=0; (i < wcslen(str_unicode)) && (i < (str_ascii_size - 1)); i++)
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{
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for (j=0; j <= 256; j++)
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{
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if (j == 256)
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{
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illegal_chars = true;
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j = 0x2e;
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break;
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}
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if (str_unicode[i] == unicode_to_ascii[j]) break;
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}
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str_ascii[i] = (char) j;
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}
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str_ascii[i] = '\0';
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if (illegal_chars)
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return(false);
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else
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return(true);
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}
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/*
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* ChangePasswordPEM() returns:
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* -1 Wrong password
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* 0 Changing password failed for unknown reason
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* 1 Password changed successfully
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*/
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static int
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ChangePasswordPEM(HWND hwndDlg)
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{
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TCHAR keyfile[MAX_PATH];
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char oldpsw[50];
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char newpsw[50];
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WCHAR oldpsw_unicode[50];
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WCHAR newpsw_unicode[50];
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FILE *fp;
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EVP_PKEY *privkey;
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/* Get filename, old_psw and new_psw from Dialog */
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GetDlgItemText(hwndDlg, ID_TXT_KEYFILE, keyfile, _countof(keyfile) - 1);
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GetDlgItemTextW(hwndDlg, ID_EDT_PASS_CUR, oldpsw_unicode, sizeof(oldpsw_unicode)/2 - 1);
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GetDlgItemTextW(hwndDlg, ID_EDT_PASS_NEW, newpsw_unicode, sizeof(newpsw_unicode)/2 - 1);
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/* Convert Unicode to ASCII (CP850) */
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ConvertUnicode2Ascii(oldpsw_unicode, oldpsw, sizeof(oldpsw));
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if (!ConvertUnicode2Ascii(newpsw_unicode, newpsw, sizeof(newpsw)))
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{
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ShowLocalizedMsg(IDS_ERR_INVALID_CHARS_IN_PSW);
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return(-1);
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}
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privkey = EVP_PKEY_new();
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/* Open old keyfile for reading */
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if (! (fp = _tfopen (keyfile, _T("r"))))
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{
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/* can't open key file */
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ShowLocalizedMsg(IDS_ERR_OPEN_PRIVATE_KEY_FILE, keyfile);
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return(0);
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}
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/* Import old key */
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if (! (privkey = PEM_read_PrivateKey (fp, NULL, NULL, oldpsw)))
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{
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/* wrong password */
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ShowLocalizedMsg(IDS_ERR_OLD_PWD_INCORRECT);
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fclose(fp);
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return(-1);
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}
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fclose(fp);
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/* Open keyfile for writing */
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if (! (fp = _tfopen (keyfile, _T("w"))))
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{
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/* can't open file rw */
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ShowLocalizedMsg(IDS_ERR_OPEN_WRITE_KEY, keyfile);
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EVP_PKEY_free(privkey);
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return(0);
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}
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/* Write new key to file */
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if (strlen(newpsw) == 0)
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{
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/* No passphrase */
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if ( !(PEM_write_PrivateKey(fp, privkey, \
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NULL, NULL, /* Use NO encryption */
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0, 0, NULL)))
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{
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/* error writing new key */
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ShowLocalizedMsg(IDS_ERR_WRITE_NEW_KEY, keyfile);
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EVP_PKEY_free(privkey);
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fclose(fp);
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return(0);
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}
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}
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else
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{
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/* Use passphrase */
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if ( !(PEM_write_PrivateKey(fp, privkey, \
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EVP_des_ede3_cbc(), /* Use 3DES encryption */
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(UCHAR*) newpsw, (int) strlen(newpsw), 0, NULL)))
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{
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/* can't write new key */
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ShowLocalizedMsg(IDS_ERR_WRITE_NEW_KEY, keyfile);
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EVP_PKEY_free(privkey);
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fclose(fp);
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return(0);
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}
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}
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EVP_PKEY_free(privkey);
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fclose(fp);
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/* signal success to user */
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ShowLocalizedMsg(IDS_NFO_PWD_CHANGED);
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return(1);
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}
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/*
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* ChangePasswordPKCS12() returns:
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* -1 Wrong password
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* 0 Changing password failed for unknown reason
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* 1 Password changed successfully
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*/
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static int
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ChangePasswordPKCS12(HWND hwndDlg)
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{
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TCHAR keyfile[MAX_PATH];
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char oldpsw[50];
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char newpsw[50];
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WCHAR oldpsw_unicode[50];
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WCHAR newpsw_unicode[50];
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FILE *fp;
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EVP_PKEY *privkey;
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X509 *cert;
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STACK_OF(X509) *ca = NULL;
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PKCS12 *p12;
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char *alias;
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/* Get filename, old_psw and new_psw from Dialog */
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GetDlgItemText(hwndDlg, ID_TXT_KEYFILE, keyfile, _countof(keyfile) - 1);
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GetDlgItemTextW(hwndDlg, ID_EDT_PASS_CUR, oldpsw_unicode, sizeof(oldpsw_unicode)/2 - 1);
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GetDlgItemTextW(hwndDlg, ID_EDT_PASS_NEW, newpsw_unicode, sizeof(newpsw_unicode)/2 - 1);
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/* Convert Unicode to ASCII (CP850) */
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ConvertUnicode2Ascii(oldpsw_unicode, oldpsw, sizeof(oldpsw));
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if (!ConvertUnicode2Ascii(newpsw_unicode, newpsw, sizeof(newpsw)))
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{
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ShowLocalizedMsg(IDS_ERR_INVALID_CHARS_IN_PSW);
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return(-1);
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}
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/* Load the PKCS #12 file */
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if (!(fp = _tfopen(keyfile, _T("rb"))))
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{
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/* error opening file */
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ShowLocalizedMsg(IDS_ERR_OPEN_PRIVATE_KEY_FILE, keyfile);
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return(0);
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}
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p12 = d2i_PKCS12_fp(fp, NULL);
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fclose (fp);
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if (!p12)
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{
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/* error reading PKCS #12 */
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ShowLocalizedMsg(IDS_ERR_READ_PKCS12, keyfile);
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return(0);
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}
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/* Parse the PKCS #12 file */
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if (!PKCS12_parse(p12, oldpsw, &privkey, &cert, &ca))
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{
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/* old password incorrect */
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ShowLocalizedMsg(IDS_ERR_OLD_PWD_INCORRECT);
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PKCS12_free(p12);
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return(-1);
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}
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/* Free old PKCS12 object */
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PKCS12_free(p12);
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/* Get FriendlyName of old cert */
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alias = (char*) X509_alias_get0(cert, NULL);
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/* Create new PKCS12 object */
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p12 = PKCS12_create(newpsw, alias, privkey, cert, ca, 0,0,0,0,0);
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if (!p12)
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{
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/* create failed */
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ShowLocalizedMsg(IDS_ERR_CREATE_PKCS12);
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return(0);
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}
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/* Free old key, cert and ca */
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EVP_PKEY_free(privkey);
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X509_free(cert);
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sk_X509_pop_free(ca, X509_free);
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/* Open keyfile for writing */
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if (!(fp = _tfopen(keyfile, _T("wb"))))
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{
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ShowLocalizedMsg(IDS_ERR_OPEN_WRITE_KEY, keyfile);
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PKCS12_free(p12);
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return(0);
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}
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/* Write new key to file */
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i2d_PKCS12_fp(fp, p12);
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PKCS12_free(p12);
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fclose(fp);
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/* signal success to user */
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ShowLocalizedMsg(IDS_NFO_PWD_CHANGED);
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return(1);
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}
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INT_PTR CALLBACK
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ChangePassphraseDialogFunc(HWND hwndDlg, UINT msg, WPARAM wParam, UNUSED LPARAM lParam)
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{
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HICON hIcon;
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TCHAR keyfile[MAX_PATH];
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int keyfile_format;
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BOOL Translated;
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switch (msg) {
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case WM_INITDIALOG:
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hIcon = LoadLocalizedIcon(ID_ICO_APP);
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if (hIcon) {
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SendMessage(hwndDlg, WM_SETICON, (WPARAM) (ICON_SMALL), (LPARAM) (hIcon));
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SendMessage(hwndDlg, WM_SETICON, (WPARAM) (ICON_BIG), (LPARAM) (hIcon));
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}
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return FALSE;
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case WM_COMMAND:
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switch (LOWORD(wParam)) {
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case IDOK:
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/* Check if the type new passwords match. */
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if (!ConfirmNewPassword (hwndDlg))
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{
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/* passwords don't match */
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ShowLocalizedMsg(IDS_ERR_PWD_DONT_MATCH);
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break;
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}
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/* Check minimum length of password */
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if (NewPasswordLengh(hwndDlg) < MIN_PASSWORD_LEN)
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{
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ShowLocalizedMsg(IDS_ERR_PWD_TO_SHORT, MIN_PASSWORD_LEN);
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break;
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}
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/* Confirm if the new password is empty. */
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if (NewPasswordLengh(hwndDlg) == 0
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&& ShowLocalizedMsgEx(MB_YESNO, _T(PACKAGE_NAME), IDS_NFO_EMPTY_PWD) == IDNO)
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break;
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GetDlgItemText(hwndDlg, ID_TXT_KEYFILE, keyfile, _countof(keyfile) - 1);
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keyfile_format=GetDlgItemInt(hwndDlg, ID_TXT_KEYFORMAT, &Translated, FALSE);
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if (keyfile_format == KEYFILE_FORMAT_PEM)
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{
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/* Change password of a PEM file */
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if (ChangePasswordPEM(hwndDlg) == -1) /* Wrong password */
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break;
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}
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else if (keyfile_format == KEYFILE_FORMAT_PKCS12)
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{
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/* Change password of a .P12 file */
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if (ChangePasswordPKCS12(hwndDlg) == -1) /* Wrong password */
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break;
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}
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else
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{
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/* Unknown key format */
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ShowLocalizedMsg(IDS_ERR_UNKNOWN_KEYFILE_FORMAT);
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}
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DestroyWindow(hwndDlg);
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break;
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case IDCANCEL:
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DestroyWindow(hwndDlg);
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break;
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}
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break;
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case WM_DESTROY:
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PostQuitMessage(0);
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break;
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case WM_CLOSE:
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DestroyWindow(hwndDlg);
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return FALSE;
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}
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return FALSE;
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}
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static int
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LineBeginsWith(char *line, const char *keyword, const unsigned int len)
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{
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if (strncmp(line, keyword, len) == 0)
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{
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if ((line[len] == '\t') || (line[len] == ' '))
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return true;
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}
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return false;
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}
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static int
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ParseKeyFilenameLine(connection_t *c, TCHAR *keyfilename, size_t keyfilenamesize, char *line)
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{
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const int STATE_INITIAL = 0;
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const int STATE_READING_QUOTED_PARM = 1;
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const int STATE_READING_UNQUOTED_PARM = 2;
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int i=0;
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unsigned int j=0;
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int state = STATE_INITIAL;
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int backslash=0;
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TCHAR temp_filename[MAX_PATH];
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while(line[i] != '\0')
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{
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if (state == STATE_INITIAL)
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{
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if (line[i] == '\"')
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{
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state=STATE_READING_QUOTED_PARM;
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}
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else if ((line[i] == 0x0A) || (line[i] == 0x0D))
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break;
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else if ((line[i] == ';') || (line[i] == '#'))
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break;
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else if ((line[i] != ' ') && (line[i] != '\t'))
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{
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if (line[i] == '\\')
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{
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if(!backslash)
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{
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keyfilename[j++]=line[i];
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state=STATE_READING_UNQUOTED_PARM;
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backslash=1;
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}
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else
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{
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backslash=0;
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}
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}
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else
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{
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if (backslash) backslash=0;
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keyfilename[j++]=line[i];
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state=STATE_READING_UNQUOTED_PARM;
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}
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}
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}
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else if (state == STATE_READING_QUOTED_PARM)
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{
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if (line[i] == '\"')
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break;
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if ((line[i] == 0x0A) || (line[i] == 0x0D))
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break;
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if (line[i] == '\\')
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{
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if (!backslash)
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{
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keyfilename[j++]=line[i];
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backslash=1;
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}
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else
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{
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backslash=0;
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}
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}
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else
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{
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if (backslash) backslash=0;
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keyfilename[j++]=line[i];
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}
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}
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else if (state == STATE_READING_UNQUOTED_PARM)
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{
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if (line[i] == '\"')
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break;
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if ((line[i] == 0x0A) || (line[i] == 0x0D))
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break;
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if ((line[i] == ';') || (line[i] == '#'))
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break;
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if (line[i] == ' ')
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break;
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if (line[i] == '\t')
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break;
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if (line[i] == '\\')
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{
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if (!backslash)
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{
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keyfilename[j++]=line[i];
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backslash=1;
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}
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else
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{
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backslash=0;
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}
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}
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else
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{
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if (backslash) backslash=0;
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keyfilename[j++]=line[i];
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}
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}
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if (j >= (keyfilenamesize - 1))
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{
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/* key filename to long */
|
|
ShowLocalizedMsg(IDS_ERR_KEY_FILENAME_TO_LONG);
|
|
return(0);
|
|
}
|
|
i++;
|
|
}
|
|
keyfilename[j]='\0';
|
|
|
|
/* Prepend filename with configdir path if needed */
|
|
if ((keyfilename[0] != '\\') && (keyfilename[0] != '/') && (keyfilename[1] != ':'))
|
|
{
|
|
_tcsncpy(temp_filename, c->config_dir, _countof(temp_filename));
|
|
if (temp_filename[_tcslen(temp_filename) - 1] != '\\')
|
|
_tcscat(temp_filename, _T("\\"));
|
|
_tcsncat(temp_filename, keyfilename,
|
|
_countof(temp_filename) - _tcslen(temp_filename) - 1);
|
|
_tcsncpy(keyfilename, temp_filename, keyfilenamesize - 1);
|
|
}
|
|
|
|
return(1);
|
|
}
|
|
|
|
static int
|
|
GetKeyFilename(connection_t *c, TCHAR *keyfilename, size_t keyfilenamesize, int *keyfile_format, bool silent)
|
|
{
|
|
FILE *fp = NULL;
|
|
char line[256];
|
|
int found_key=0;
|
|
int found_pkcs12=0;
|
|
TCHAR configfile_path[MAX_PATH];
|
|
int ret = 0;
|
|
|
|
_tcsncpy(configfile_path, c->config_dir, _countof(configfile_path));
|
|
if (!(configfile_path[_tcslen(configfile_path)-1] == '\\'))
|
|
_tcscat(configfile_path, _T("\\"));
|
|
_tcsncat(configfile_path, c->config_file,
|
|
_countof(configfile_path) - _tcslen(configfile_path) - 1);
|
|
|
|
if (!(fp=_tfopen(configfile_path, _T("r"))))
|
|
{
|
|
/* can't open config file */
|
|
if (!silent)
|
|
ShowLocalizedMsg(IDS_ERR_OPEN_CONFIG, configfile_path);
|
|
goto out;
|
|
}
|
|
|
|
while (fgets(line, sizeof (line), fp))
|
|
{
|
|
if (LineBeginsWith(line, "key", 3))
|
|
{
|
|
if (found_key)
|
|
{
|
|
/* only one key option */
|
|
if (!silent)
|
|
ShowLocalizedMsg(IDS_ERR_ONLY_ONE_KEY_OPTION);
|
|
goto out;
|
|
}
|
|
if (found_pkcs12)
|
|
{
|
|
/* key XOR pkcs12 */
|
|
if (!silent)
|
|
ShowLocalizedMsg(IDS_ERR_ONLY_KEY_OR_PKCS12);
|
|
goto out;
|
|
}
|
|
found_key=1;
|
|
*keyfile_format = KEYFILE_FORMAT_PEM;
|
|
if (!ParseKeyFilenameLine(c, keyfilename, keyfilenamesize, &line[4]))
|
|
goto out;
|
|
}
|
|
if (LineBeginsWith(line, "pkcs12", 6))
|
|
{
|
|
if (found_pkcs12)
|
|
{
|
|
/* only one pkcs12 option */
|
|
if (!silent)
|
|
ShowLocalizedMsg(IDS_ERR_ONLY_ONE_PKCS12_OPTION);
|
|
goto out;
|
|
}
|
|
if (found_key)
|
|
{
|
|
/* only key XOR pkcs12 */
|
|
if (!silent)
|
|
ShowLocalizedMsg(IDS_ERR_ONLY_KEY_OR_PKCS12);
|
|
goto out;
|
|
}
|
|
found_pkcs12=1;
|
|
*keyfile_format = KEYFILE_FORMAT_PKCS12;
|
|
if (!ParseKeyFilenameLine(c, keyfilename, keyfilenamesize, &line[7]))
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if ((!found_key) && (!found_pkcs12))
|
|
{
|
|
/* must have key or pkcs12 option */
|
|
if (!silent)
|
|
ShowLocalizedMsg(IDS_ERR_HAVE_KEY_OR_PKCS12);
|
|
goto out;
|
|
}
|
|
ret = 1;
|
|
out:
|
|
if (fp)
|
|
fclose(fp);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static DWORD WINAPI
|
|
ChangePassphraseThread(LPVOID data)
|
|
{
|
|
HWND hwndChangePSW;
|
|
MSG messages;
|
|
TCHAR conn_name[100];
|
|
TCHAR keyfilename[MAX_PATH];
|
|
int keyfile_format=0;
|
|
connection_t *c = data;
|
|
|
|
/* Cut of extention from config filename. */
|
|
_tcsncpy(conn_name, c->config_file, _countof(conn_name));
|
|
conn_name[_tcslen(conn_name) - (_tcslen(o.ext_string)+1)]=0;
|
|
|
|
/* Get Key filename from config file */
|
|
if (!GetKeyFilename(c, keyfilename, _countof(keyfilename), &keyfile_format, false))
|
|
{
|
|
ExitThread(1);
|
|
}
|
|
|
|
/* Show ChangePassphrase Dialog */
|
|
hwndChangePSW = CreateLocalizedDialog(ID_DLG_CHGPASS, ChangePassphraseDialogFunc);
|
|
if (!hwndChangePSW)
|
|
ExitThread(1);
|
|
SetDlgItemText(hwndChangePSW, ID_TXT_KEYFILE, keyfilename);
|
|
SetDlgItemInt(hwndChangePSW, ID_TXT_KEYFORMAT, (UINT) keyfile_format, FALSE);
|
|
|
|
SetWindowText(hwndChangePSW, LoadLocalizedString(IDS_NFO_CHANGE_PWD, conn_name));
|
|
|
|
ShowWindow(hwndChangePSW, SW_SHOW);
|
|
|
|
|
|
/* Run the message loop. It will run until GetMessage() returns 0 */
|
|
while (GetMessage (&messages, NULL, 0, 0))
|
|
{
|
|
if(!IsDialogMessage(hwndChangePSW, &messages))
|
|
{
|
|
TranslateMessage(&messages);
|
|
DispatchMessage(&messages);
|
|
}
|
|
}
|
|
|
|
CloseHandle (hwndChangePSW);
|
|
ExitThread(0);
|
|
}
|
|
|
|
|
|
void
|
|
ShowChangePassphraseDialog(connection_t *c)
|
|
{
|
|
HANDLE hThread;
|
|
DWORD IDThread;
|
|
|
|
/* Start a new thread to have our own message-loop for this dialog */
|
|
hThread = CreateThread(NULL, 0, ChangePassphraseThread, c, 0, &IDThread);
|
|
if (hThread == NULL)
|
|
{
|
|
/* error creating thread */
|
|
ShowLocalizedMsg(IDS_ERR_CREATE_PASS_THREAD);
|
|
return;
|
|
}
|
|
CloseHandle (hThread);
|
|
}
|
|
|
|
bool
|
|
CheckKeyFileWriteAccess (connection_t *c)
|
|
{
|
|
TCHAR keyfile[MAX_PATH];
|
|
int format = 0;
|
|
if (!GetKeyFilename (c, keyfile, _countof(keyfile), &format, true))
|
|
return FALSE;
|
|
else
|
|
return CheckFileAccess (keyfile, GENERIC_WRITE);
|
|
}
|
|
|
|
#endif
|