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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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* |
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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 |
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* 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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#include <io.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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|
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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_key_t key; |
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const char *id; |
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char *info; |
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void *ctx = NULL, *item; |
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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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if (gpgme_op_decrypt_result (c->gpg) != NULL && |
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c->gpg_cmd == GPG_CMD_DECRYPT) { |
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gpgme_recipient_t r; |
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gpgme_decrypt_result_t res; |
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|
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res = gpgme_op_decrypt_result (c->gpg); |
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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->uid; |
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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 [8+strlen (uid) + 4 + strlen (r->keyid) + 2]; |
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if (!info) |
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BUG (NULL); |
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sprintf (info, "%s (%s, 0x%s)", uid, |
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get_key_pubalgo (r->pubkey_algo), r->keyid+8); |
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free (uid); |
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free (info); |
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} |
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else { |
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info = new char [32 + strlen (r->keyid) + 2]; |
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if (!info) |
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BUG (NULL); |
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sprintf (info, _("Unknown (key ID 0x%s)"), |
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r->keyid? r->keyid+8 : "????????"); |
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free (info); |
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} |
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listbox_add_string (GetDlgItem( dlg, IDC_DECRYPT_LIST ), info); |
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} |
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} |
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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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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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return FALSE; |
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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+1]; |
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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, sizeof (c->pwd) -1); |
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} |
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if (reg_prefs.cache_time > 0 && !c->is_card && !strstr (c->keyid, "missing")) { |
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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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void *item; |
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const char *keyid, *pass; |
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int rc; |
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|
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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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keyid = parse_gpg_keyid (passphrase_info); |
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pass = agent_get_cache (keyid, &item); |
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if (pass) { |
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agent_unlock_cache_entry (&item); |
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c->pwd_init = 0; |
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write (fd, pass, strlen (pass)); |
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write (fd, "\n", 1); |
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return 0; |
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} |
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} |
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|
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if (c->pwd_init) { |
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if (keyid && strlen (keyid) == 16) |
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strcpy (c->keyid, keyid+8); |
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|
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/* if the desc has a length of 32 and only hex digits, we assume a |
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smart card has been used. */ |
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if (uid_hint && strlen (uid_hint) == 32 && !is_hexstring (uid_hint)) { |
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char buf[16]; |
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memset (buf, 0, sizeof buf); |
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strncpy (buf, uid_hint+20, 8); |
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_snprintf (c->info, sizeof c->info-1, |
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_("Please enter the PIN to unlock your secret card key\n" |
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"Card: %s"), buf); |
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c->is_card = 1; |
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} |
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else if (uid_hint) |
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parse_gpg_description (uid_hint, passphrase_info, |
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c->info, sizeof c->info - 1); |
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if (c->gpg_cmd == GPG_CMD_DECRYPT) { |
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rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT, |
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(HWND)c->hwnd, passphrase_callback_proc, |
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(LPARAM)c); |
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} |
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else if (c->gpg_cmd == GPG_CMD_SIGN) { |
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rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN, |
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(HWND)c->hwnd, passphrase_callback_proc, |
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(LPARAM)c); |
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} |
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if (rc == -1) { |
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write (fd, "\n", 1); |
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return gpg_error (GPG_ERR_EOF); |
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} |
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c->pwd_init = 0; |
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} |
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if (c->cancel) { |
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write (fd, "\n", 1); |
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return gpg_error (GPG_ERR_EOF); |
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} |
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|
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write (fd, c->pwd, strlen (c->pwd)); |
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write (fd, "\n", 1); |
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return 0; |
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} |
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|
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|
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/* Initialize the given passphrase callback @cb with the |
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used gpgme context @ctx, the command @cmd and a title |
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@title for the dialog. */ |
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void |
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set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx, |
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int cmd, HWND hwnd, const char *title) |
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{ |
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memset (cb, 0, sizeof *cb); |
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cb->gpg_cmd = cmd; |
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cb->is_card = 0; |
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cb->cancel = 0; |
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cb->hwnd = hwnd; |
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cb->pwd_init = 1; |
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free_if_alloc (cb->title); |
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cb->title = m_strdup (title); |
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if (!cb->title) |
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BUG (NULL); |
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gpgme_set_passphrase_cb (ctx, passphrase_cb, cb); |
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cb->gpg = ctx; |
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} |
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|
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|
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/* Release a passphrase callback @ctx. */ |
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void |
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release_gpg_passphrase_cb (passphrase_cb_s *ctx) |
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{ |
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if (!ctx) |
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return; |
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sfree_if_alloc (ctx->pwd); |
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free_if_alloc (ctx->title); |
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} |
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|
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/* Simple check to measure passphrase (@pass) quality. |
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Return value: 0 on success. */ |
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int |
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check_passwd_quality (const char *pass, int strict) |
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{ |
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int i, nd=0, nc=0, n; |
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|
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n = strlen (pass); |
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if (n < 8) |
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return -1; |
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|
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for (i=0; i < n; i++) { |
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if (isdigit (pass[i])) nd++; |
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if (isalpha (pass[i])) nc++; |
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} |
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|
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if (nd == n || nc == n) |
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return -1; |
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|
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return 0; |
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} |
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