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/* OEPassphraseDLG.cpp - GPGME Passphrase Callback |
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* Copyright (C) 2001, 2002, 2006 Timo Schulz |
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* |
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* This file is part of GPGOE. |
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* |
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* GPGOE is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation; either version 2.1 of the License, or |
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* (at your option) any later version. |
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* |
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* GPGOE 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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|
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#ifdef HAVE_CONFIG_H |
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#include <config.h> |
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#endif |
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#include <windows.h> |
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#include <assert.h> |
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#include "resource.h" |
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#include "gpgme.h" |
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#include "GPGOE.h" |
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|
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|
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/* Structure for the passphrase callback. */ |
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struct pass_cb_s { |
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const char *uid_hint; |
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const char *passphrase_info; |
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char keyid[8+2]; |
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char *pass; |
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HWND main_wnd; |
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int cancel; |
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int prev_was_bad; |
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}; |
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|
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|
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/* Reference to the passphrase cache. */ |
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extern char gpgoe_pass_cache[HASH_BUCKETS][256]; |
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|
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|
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DWORD hash_string (const char *str_param); |
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|
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/* Store the passphrase @pass in the hash table using the keyid @keyid |
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as the index. */ |
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static void |
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passphrase_put (char ctx[HASH_BUCKETS][256], const char *keyid, const char *pass) |
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{ |
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int pos = hash_string (keyid) % HASH_BUCKETS; |
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int n, passlen; |
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|
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/* We cannot store passphrase of that size. */ |
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passlen = strlen (pass); |
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if (passlen > 255) |
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return; |
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|
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n = 0; |
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while (n < HASH_BUCKETS) { |
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if (strlen (ctx[(pos+n) % HASH_BUCKETS]) != 0) { |
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n++; |
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continue; |
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} |
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memcpy (ctx[(pos+n) % HASH_BUCKETS], keyid, strlen (keyid)); |
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strncpy (ctx[(pos+n) % HASH_BUCKETS]+strlen (keyid), pass, passlen); |
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break; |
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} |
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} |
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|
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|
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/* Return the requested passphrase from the hash table @ctx |
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using the keyid @keyid as the index. Or NULL if there is |
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no stored passphrase. */ |
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static const char* |
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passphrase_get (char ctx[HASH_BUCKETS][256], const char *keyid) |
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{ |
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const char *item; |
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int pos = hash_string (keyid) % HASH_BUCKETS; |
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int n; |
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|
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n = 0; |
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item = gpgoe_pass_cache[pos]; |
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while (n < HASH_BUCKETS) { |
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item = ctx[(pos+n) % HASH_BUCKETS]; |
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if (!strncmp (item, keyid, strlen (keyid))) |
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break; |
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n++; |
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} |
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|
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if (strlen (item) > 0 && !strncmp (item, keyid, strlen (keyid))) |
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return item + strlen (keyid); |
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/* Return NULL to indicate no matching entry. */ |
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return NULL; |
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} |
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|
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|
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/* Extract public key algorithm from passwd info. */ |
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const char* |
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get_pubkey_algo (const char *passphrase_info) |
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{ |
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size_t pos = 16+1+16+1; |
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|
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/* AA6F7AB7DD3B4A21 E71D9BC8C93A8529 1 0 */ |
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assert (strlen (passphrase_info) > pos); |
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switch (atol (passphrase_info+pos)) { |
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case 1: return "RSA"; |
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case 17: return "DSA"; |
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case 16: return "ELG"; |
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default: break; |
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} |
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return "???"; |
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} |
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|
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|
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/* Passphrase callback dialog box procedure. */ |
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BOOL CALLBACK |
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pass_cb_dlg_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam) |
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{ |
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static pass_cb_t ctx; |
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char *info; |
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int n; |
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|
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switch (msg) { |
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case WM_INITDIALOG: |
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ctx = (pass_cb_t)lparam; |
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assert (ctx != NULL); |
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if (ctx->uid_hint && ctx->passphrase_info) { |
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char *utf8_uid = utf8_to_native (ctx->uid_hint+17); |
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info = xcalloc (1, strlen (utf8_uid) + strlen (ctx->keyid) + 32); |
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sprintf (info, _("%s\n%s key, ID %s"), utf8_uid, |
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get_pubkey_algo (ctx->passphrase_info), ctx->keyid); |
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SetDlgItemText (dlg, IDC_DECRYPT_MSG, info); |
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free_if_alloc (utf8_uid); |
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free_if_alloc (info); |
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} |
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SetDlgItemText (dlg, IDOK, _("&OK")); |
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SetDlgItemText (dlg, IDCANCEL, _("&Cancel")); |
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SetDlgItemText (dlg, IDC_DECRYPT_PWDINFO, _("Please enter your passphrase")); |
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SendDlgItemMessage (dlg, IDC_DECRYPT_PWD, EM_SETPASSWORDCHAR, |
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(WPARAM)(UINT)'*', 0); |
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CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED); |
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SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide typing")); |
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SetWindowText (dlg, _("Decryption")); |
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SetForegroundWindow (dlg); |
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center_window (dlg, ctx->main_wnd); |
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break; |
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|
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case WM_COMMAND: |
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if (HIWORD (wparam) == BN_CLICKED && |
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LOWORD (wparam) == IDC_DECRYPT_HIDE) { |
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HWND hwnd; |
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hwnd = GetDlgItem (dlg, IDC_DECRYPT_PWD); |
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SendMessage (hwnd, EM_SETPASSWORDCHAR, |
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IsDlgButtonChecked (dlg, IDC_DECRYPT_HIDE)? '*' : 0, 0); |
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SetFocus (hwnd); |
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break; |
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} |
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|
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switch (LOWORD (wparam)) { |
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case IDCANCEL: |
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ctx->cancel = 1; |
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free_if_alloc (ctx->pass); |
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EndDialog (dlg, FALSE); |
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break; |
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|
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case IDOK: |
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if (ctx->prev_was_bad) |
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SetDlgItemText (dlg, IDC_DECRYPT_PWDINFO, |
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_("Invalid passphrase; please enter your passphrase again")); |
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else |
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SetDlgItemText (dlg, IDC_DECRYPT_PWDINFO, |
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_("Please enter your passphrase")); |
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n = SendDlgItemMessage (dlg, IDC_DECRYPT_PWD, |
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WM_GETTEXTLENGTH, 0, 0); |
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if (n < 1) { |
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MessageBox (dlg, _("Please enter your passphrase"), |
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_("GPG Plug-in Info"), MB_ICONINFORMATION|MB_OK); |
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return FALSE; |
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} |
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/* Make sure we reset the cancel flag. */ |
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ctx->cancel = 0; |
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ctx->pass = xcalloc (1, n+2); |
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GetDlgItemText (dlg, IDC_DECRYPT_PWD, ctx->pass, n+1); |
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|
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if (gpgoe_get_active_modes () & GPGOE_MODE_CACHEPASS) |
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passphrase_put (gpgoe_pass_cache, ctx->keyid, ctx->pass); |
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EndDialog (dlg, TRUE); |
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break; |
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} |
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break; |
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} |
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return FALSE; |
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} |
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|
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|
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/* GPGME compatible passphrase callback. */ |
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gpgme_error_t |
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passphrase_cb (void *hook, |
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const char *uid_hint, |
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const char *passphrase_info, |
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int prev_was_bad, int fd) |
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{ |
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pass_cb_t cb = (pass_cb_t)hook; |
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HANDLE fp = (HANDLE)fd; |
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const char *pass; |
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DWORD nwritten; |
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|
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assert (cb != NULL); |
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cb->prev_was_bad = prev_was_bad; |
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if (prev_was_bad && !cb->cancel) { |
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wipememory (cb->pass, strlen (cb->pass)); |
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free_if_alloc (cb->pass); |
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} |
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if (!cb->pass && !cb->cancel) { |
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cb->uid_hint = uid_hint; |
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cb->passphrase_info = passphrase_info; |
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memset (cb->keyid, 0, sizeof (cb->keyid)); |
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memcpy (cb->keyid, cb->passphrase_info+8, 8); |
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|
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pass = passphrase_get (gpgoe_pass_cache, cb->keyid); |
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if (pass) |
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cb->pass = xstrdup (pass); |
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else |
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DialogBoxParam (mod_hinst_dll, (LPCTSTR)IDD_DECRYPT, |
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cb->main_wnd, pass_cb_dlg_proc, (LPARAM)cb); |
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} |
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if (cb->cancel) |
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WriteFile (fp, "\n", 1, &nwritten, NULL); |
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else if (cb->pass != NULL) { |
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WriteFile (fp, cb->pass, strlen (cb->pass), &nwritten, NULL); |
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WriteFile (fp, "\n", 1, &nwritten, NULL); |
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} |
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return 0; |
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} |
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|
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|
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/* Allocate new passphrase callback context. */ |
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pass_cb_t |
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new_pass_cb (HWND main) |
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{ |
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pass_cb_t cb_val; |
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|
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cb_val = xcalloc (1, sizeof *cb_val); |
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cb_val->main_wnd = main; |
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return cb_val; |
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} |
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|
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|
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|
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/* Free passphrase callback context. */ |
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void |
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free_pass_cb (pass_cb_t cb) |
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{ |
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if (!cb) |
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return; |
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if (cb->pass) { |
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wipememory (cb->pass, strlen (cb->pass)); |
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free_if_alloc (cb->pass); |
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} |
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free_if_alloc (cb); |
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} |
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|
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|
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/* Return 1 if the passphrase dialog were cancelled. */ |
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int |
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pass_cb_cancelled (pass_cb_t cb) |
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{ |
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return cb->cancel; |
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} |
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|
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|
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/* Reset the passphrase cache by overwritting each items with zeroes */ |
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void |
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reset_pass_cache (void) |
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{ |
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int i; |
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|
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for (i=0; i < HASH_BUCKETS; i++) |
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wipememory (gpgoe_pass_cache[i], DIM (gpgoe_pass_cache[i])); |
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} |
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