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/* wptPassphraseCB.cpp - GPGME Passphrase Callback |
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* Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz |
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* Copyright (C) 2005 g10 Code GmbH |
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* |
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* This file is part of WinPT. |
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* |
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* WinPT is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 |
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* of the License, or (at your option) any later version. |
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* |
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* WinPT 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 GNU |
| 15 |
* 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 WinPT; if not, write to the Free Software Foundation, |
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#include <windows.h> |
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#include <ctype.h> |
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|
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#include "../resource.h" |
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#include "wptNLS.h" |
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#include "wptW32API.h" |
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#include "wptVersion.h" |
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#include "wptGPG.h" |
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#include "wptCommonCtl.h" |
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#include "wptContext.h" |
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#include "wptDlgs.h" |
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#include "wptUTF8.h" |
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#include "wptErrors.h" |
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#include "wptTypes.h" |
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#include "wptKeyList.h" |
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#include "wptAgent.h" |
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#include "wptRegistry.h" |
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|
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const char* get_symkey_algo (int algo); |
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|
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#define item_ctrl_id( cmd ) \ |
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((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD) |
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|
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#define item_ctrl_id2(cmd) \ |
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((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE) |
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|
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|
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/* Dialog procedure for the passphrase callback. */ |
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static BOOL CALLBACK |
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passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam) |
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{ |
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static passphrase_cb_s * c; |
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gpgme_decrypt_result_t res; |
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gpgme_sign_result_t res_sig; |
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gpgme_key_t key; |
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void *ctx = NULL, *item; |
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const char *id; |
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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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c = (passphrase_cb_s *)lparam; |
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if (!c) |
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BUG (0); |
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SetWindowText (dlg, c->title); |
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if (c->gpg_cmd == GPG_CMD_DECRYPT) { |
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SetDlgItemText( dlg, IDC_DECRYPT_LISTINF, |
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_("Encrypted with the following public key(s)") ); |
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CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED ); |
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} |
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else if (c->gpg_cmd == GPG_CMD_SIGN) |
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CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED); |
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res = gpgme_op_decrypt_result (c->gpg); |
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if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) { |
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gpgme_recipient_t r; |
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|
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/* XXX: not all ENCRYPT_TO entries are listed here. */ |
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for (r = res->recipients; r; r = r->next) { |
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get_pubkey (r->keyid, &key); |
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if (key) { |
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char *uid; |
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id = key->uids->name; |
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if (!id) |
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id = _("Invalid User ID"); |
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uid = utf8_to_wincp (id, strlen (id)); |
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info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1 |
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+ strlen (key->uids->email)+1]; |
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if (!info) |
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BUG (NULL); |
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sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email, |
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get_key_pubalgo (r->pubkey_algo), r->keyid+8); |
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free (uid); |
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|
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} |
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else { |
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info = new char [32 + strlen (r->keyid)+1 + 4]; |
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if (!info) |
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BUG (NULL); |
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sprintf (info, _("Unknown key ID (%s, 0x%s)"), |
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get_key_pubalgo (r->pubkey_algo), r->keyid+8); |
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} |
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listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info); |
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free_if_alloc (info); |
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} |
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} |
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else if (c->gpg_cmd == GPG_CMD_DECRYPT) |
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EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE); |
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SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT? |
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IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO, |
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_("Please enter your passphrase")); |
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if (c->gpg_cmd == GPG_CMD_DECRYPT) { |
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SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD)); |
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if (res && !res->recipients) { |
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const char *s = _("Symmetric encryption.\n" |
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"%s encrypted data."); |
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const char *alg = get_symkey_algo (c->sym.sym_algo); |
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info = new char[strlen (s) + strlen (alg) + 2]; |
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if (!info) |
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BUG (NULL); |
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sprintf (info, s, alg); |
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SetDlgItemText (dlg, IDC_DECRYPT_MSG, info); |
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free_if_alloc (info); |
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} |
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else |
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SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info); |
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} |
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else { |
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SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD)); |
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SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info); |
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} |
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center_window (dlg, NULL); |
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SetForegroundWindow (dlg); |
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set_active_window (dlg); |
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return FALSE; |
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|
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case WM_SYSCOMMAND: |
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if( LOWORD( wparam ) == SC_CLOSE ) { |
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SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" ); |
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c->cancel = 1; |
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EndDialog( dlg, TRUE ); |
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} |
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break; |
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|
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case WM_COMMAND: |
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switch( HIWORD( wparam ) ) { |
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case BN_CLICKED: |
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if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE |
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|| LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) { |
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HWND hwnd; |
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int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd)); |
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hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd)); |
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SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0); |
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SetFocus (hwnd); |
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} |
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} |
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|
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switch (LOWORD (wparam)) { |
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case IDOK: |
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/* fixme: the item is even cached when the passphrase is not |
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correct, which means that the user needs to delete all |
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cached entries to continue. */ |
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if (c->pwd) { |
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delete []c->pwd; |
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c->pwd = NULL; |
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} |
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n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd)); |
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if (!n) { |
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c->pwd = new char[2]; |
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strcpy (c->pwd, ""); |
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} |
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else { |
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c->pwd = new char[n+2]; |
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if (!c->pwd) |
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BUG (NULL); |
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GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1); |
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} |
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res = gpgme_op_decrypt_result (c->gpg); |
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if (!res) |
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res_sig = gpgme_op_sign_result (c->gpg); |
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if (reg_prefs.cache_time > 0 && !c->is_card && |
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((res && res->recipients) || (res_sig && res_sig->signatures))) { |
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if (agent_get_cache (c->keyid, &item)) |
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agent_unlock_cache_entry (&item); |
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else |
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agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time); |
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} |
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EndDialog (dlg, TRUE); |
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return TRUE; |
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|
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case IDCANCEL: |
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SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" ); |
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c->cancel = 1; |
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EndDialog (dlg, FALSE); |
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return FALSE; |
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} |
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break; |
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} |
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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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/* Extract the main keyid from @pass_info. |
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Return value: long main keyid or NULL for an error. */ |
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static const char* |
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parse_gpg_keyid (const char *pass_info) |
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{ |
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static char keyid[16+1]; |
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|
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if (strlen (pass_info) < 16) |
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return NULL; |
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/* the format of the desc buffer looks like this: |
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request_keyid[16] main_keyid[16] keytype[1] keylength[4] |
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we use the main keyid to use only one cache entry. */ |
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strncpy (keyid, pass_info+17, 16); |
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keyid[16] = 0; |
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return keyid; |
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} |
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|
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|
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/* Parse the information in @uid_hint and @pass_info to generate |
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a input message for the user in @desc. */ |
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static void |
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parse_gpg_description (const char *uid_hint, const char *pass_info, |
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char *desc, int size) |
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{ |
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gpgme_pubkey_algo_t algo; |
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char usedkey[16+1], mainkey[16+1]; |
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char *uid, *p; |
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int n=0; |
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|
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while (p = strsep ((char**)&pass_info, " ")) { |
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switch (n++) { |
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case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break; |
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case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break; |
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case 2: algo = (gpgme_pubkey_algo_t)atol (p); break; |
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} |
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} |
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uid_hint += 16; /* skip keyid */ |
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uid_hint += 1; /* space */ |
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|
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uid = utf8_to_wincp (uid_hint, strlen (uid_hint)); |
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|
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if (strcmp (usedkey, mainkey)) |
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_snprintf (desc, size-1, |
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_("You need a passphrase to unlock the secret key for\n" |
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"user: \"%s\"\n" |
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"%s key, ID %s (main key ID %s)\n"), |
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uid, get_key_pubalgo (algo), usedkey+8, mainkey+8); |
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else if (!strcmp (usedkey, mainkey)) |
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_snprintf (desc, size-1, |
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_("You need a passphrase to unlock the secret key for\n" |
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"user: \"%s\"\n" |
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"%s key, ID %s\n"), |
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uid, get_key_pubalgo (algo), usedkey+8); |
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free (uid); |
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} |
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|
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|
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static int inline |
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is_hexstring (const char * p) |
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{ |
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size_t i; |
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|
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for (i=0; i < strlen (p); i++) { |
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if (!isxdigit (p[i])) |
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return -1; |
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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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/* Passphrase callback with the ability to support caching. */ |
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gpgme_error_t |
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passphrase_cb (void *hook, 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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passphrase_cb_s *c = (passphrase_cb_s*)hook; |
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HANDLE hd = (HANDLE)fd; |
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void *item; |
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const char *keyid, *pass; |
| 285 |
DWORD n; |
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int rc; |
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|
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/* XXX: pubkey_enc cancel does not quit gpg.exe */ |
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/* XXX: handle prev_was_bad case. */ |
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if (!c) |
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return gpg_error (GPG_ERR_INV_ARG); |
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|
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if (passphrase_info) { |
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if (strlen (passphrase_info) < 16) {/* assume symetric encryption. */ |
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int n=2; |
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c->sym.sym_algo = atoi (passphrase_info); |
| 297 |
if (c->sym.sym_algo > 9) |
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n++; |
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/* XXX: be more strict. */ |
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c->sym.s2k_mode = atoi (passphrase_info+n); |
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c->sym.s2k_hash = atoi (passphrase_info+n+2); |
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} |
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|
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keyid = parse_gpg_keyid (passphrase_info); |
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pass = agent_get_cache (keyid+8, &item); |
| 306 |
if (pass) { |
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agent_unlock_cache_entry (&item); |
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c->pwd_init = 0; |
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if (!WriteFile (hd, pass, strlen (pass), &n, NULL)) |
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log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno); |
| 311 |
if (!WriteFile (hd, "\n", 1, &n, NULL)) |
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log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno); |
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return 0; |
| 314 |
} |
| 315 |
} |
| 316 |
|
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if (c->pwd_init) { |
| 318 |
if (keyid && strlen (keyid) == 16) |
| 319 |
strcpy (c->keyid, keyid+8); |
| 320 |
|
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/* if the desc has a length of 32 and only hex digits, we assume a |
| 322 |
smart card has been used. */ |
| 323 |
if (uid_hint && strlen (uid_hint) == 32 && !is_hexstring (uid_hint)) { |
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char buf[16]; |
| 325 |
memset (buf, 0, sizeof buf); |
| 326 |
strncpy (buf, uid_hint+20, 8); |
| 327 |
_snprintf (c->info, sizeof c->info-1, |
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_("Please enter the PIN to unlock your secret card key\n" |
| 329 |
"Card: %s"), buf); |
| 330 |
c->is_card = 1; |
| 331 |
} |
| 332 |
else if (uid_hint) |
| 333 |
parse_gpg_description (uid_hint, passphrase_info, |
| 334 |
c->info, sizeof c->info - 1); |
| 335 |
if (c->gpg_cmd == GPG_CMD_DECRYPT) { |
| 336 |
rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT, |
| 337 |
(HWND)c->hwnd, passphrase_callback_proc, |
| 338 |
(LPARAM)c); |
| 339 |
} |
| 340 |
else if (c->gpg_cmd == GPG_CMD_SIGN) { |
| 341 |
rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN, |
| 342 |
(HWND)c->hwnd, passphrase_callback_proc, |
| 343 |
(LPARAM)c); |
| 344 |
} |
| 345 |
if (rc == -1) { |
| 346 |
WriteFile (hd, "\n", 1, &n, NULL); |
| 347 |
return gpg_error (GPG_ERR_EOF); |
| 348 |
} |
| 349 |
c->pwd_init = 0; |
| 350 |
} |
| 351 |
if (c->cancel) { |
| 352 |
WriteFile (hd, "\n", 1, &n, NULL); |
| 353 |
return gpg_error (GPG_ERR_EOF); |
| 354 |
} |
| 355 |
|
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WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL); |
| 357 |
WriteFile (hd, "\n", 1, &n, NULL); |
| 358 |
return 0; |
| 359 |
} |
| 360 |
|
| 361 |
|
| 362 |
/* Initialize the given passphrase callback @cb with the |
| 363 |
used gpgme context @ctx, the command @cmd and a title |
| 364 |
@title for the dialog. */ |
| 365 |
void |
| 366 |
set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx, |
| 367 |
int cmd, HWND hwnd, const char *title) |
| 368 |
{ |
| 369 |
memset (cb, 0, sizeof *cb); |
| 370 |
cb->gpg_cmd = cmd; |
| 371 |
cb->is_card = 0; |
| 372 |
cb->cancel = 0; |
| 373 |
cb->hwnd = hwnd; |
| 374 |
cb->pwd_init = 1; |
| 375 |
free_if_alloc (cb->title); |
| 376 |
cb->title = m_strdup (title); |
| 377 |
if (!cb->title) |
| 378 |
BUG (NULL); |
| 379 |
gpgme_set_passphrase_cb (ctx, passphrase_cb, cb); |
| 380 |
cb->gpg = ctx; |
| 381 |
} |
| 382 |
|
| 383 |
|
| 384 |
/* Release a passphrase callback @ctx. */ |
| 385 |
void |
| 386 |
release_gpg_passphrase_cb (passphrase_cb_s *ctx) |
| 387 |
{ |
| 388 |
if (!ctx) |
| 389 |
return; |
| 390 |
sfree_if_alloc (ctx->pwd); |
| 391 |
free_if_alloc (ctx->title); |
| 392 |
} |
| 393 |
|
| 394 |
/* Simple check to measure passphrase (@pass) quality. |
| 395 |
Return value: 0 on success. */ |
| 396 |
int |
| 397 |
check_passwd_quality (const char *pass, int strict) |
| 398 |
{ |
| 399 |
int i, nd=0, nc=0, n; |
| 400 |
|
| 401 |
n = strlen (pass); |
| 402 |
if (n < 8) |
| 403 |
return -1; |
| 404 |
|
| 405 |
for (i=0; i < n; i++) { |
| 406 |
if (isdigit (pass[i])) nd++; |
| 407 |
if (isalpha (pass[i])) nc++; |
| 408 |
} |
| 409 |
|
| 410 |
if (nd == n || nc == n) |
| 411 |
return -1; |
| 412 |
|
| 413 |
return 0; |
| 414 |
} |
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