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/* wptPassphraseCB.cpp - GPGME Passphrase Callback |
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* Copyright (C) 2001, 2002, 2003 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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|
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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 "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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|
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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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static int yes = 1; |
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gpgme_key_t key; |
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const char * s, * id; |
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char info[768] = {0}; |
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void * ctx = NULL, * item; |
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unsigned int pkalgo; |
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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( NULL ); |
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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( c->enc_to && c->gpg_cmd == GPG_CMD_DECRYPT ) { |
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gpgme_recipients_enum_open( c->enc_to, &ctx ); |
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while ( (s = gpgme_recipients_enum_read( c->enc_to, &ctx )) ) { |
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pkalgo = *s; s++; |
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get_pubkey( s, &key ); |
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if( key ) { |
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char * uid = NULL; |
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id = gpgme_key_get_string_attr( key, GPGME_ATTR_USERID, NULL, 0 ); |
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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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_snprintf( info, sizeof info - 1, "%s (%s, 0x%s)", uid, |
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gpgme_key_expand_attr( GPGME_ATTR_ALGO, pkalgo ), s+8 ); |
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free( uid ); |
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} |
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else |
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_snprintf( info, sizeof info - 1, _("Unknown (key ID 0x%s)"), |
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s? s + 8 : "DEADBEEF" ); |
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listbox_add_string( GetDlgItem( dlg, IDC_DECRYPT_LIST ), info ); |
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} |
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gpgme_recipients_enum_close( c->enc_to, &ctx ); |
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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 ); |
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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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yes ^= 1; |
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hwnd = GetDlgItem( dlg, item_ctrl_id( c->gpg_cmd ) ); |
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SendMessage( hwnd, EM_SETPASSWORDCHAR, yes? '*' : 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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GetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), c->pwd, sizeof c->pwd -1 ); |
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if( reg_prefs.cache_time > 0 && !c->is_card ) { |
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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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} /* passphrase_callback_proc */ |
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|
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|
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static const char * |
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parse_gpg_keyid( const char * desc ) |
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{ |
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static char keyid[16+1]; |
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char * p; |
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|
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p = strrchr( desc, '\n' ); |
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if( !p ) |
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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, desc+(p-desc+1+17), 16 ); |
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return keyid; |
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} /* parse_gpg_keyid */ |
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|
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|
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static void |
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parse_gpg_description( char * desc, int size ) |
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{ |
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char * buffer = NULL, ch, uid[128] = {0}, * uid2 = NULL; |
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char usedkey[16+1] = {0}, mainkey[16+1] = {0}; |
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const char * buf; |
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int i, algo, try_again = 0; |
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|
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if( stristr( desc, "[User ID hint missing]" ) |
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|| stristr( desc, "[passphrase info missing]" ) ) { |
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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: [UserID hint missing]\n" |
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" [passphrase info missing]\n") ); |
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return; |
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} |
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|
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buffer = new char[size+1]; |
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if( !buffer ) |
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BUG( NULL ); |
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strcpy( buffer, desc ); |
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buf = buffer; |
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if( strstr( buf, "TRY_AGAIN" ) ) { |
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buf += strlen( "TRY_AGAIN\n" ); |
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try_again = 1; |
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} |
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else if( strstr( buf, "ENTER_PASSPHRASE" ) ) |
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buf += strlen( "ENTER_PASSPHRASE\n" ); |
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else |
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BUG( NULL ); |
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buf += 17; |
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for( i = 0; i < sizeof uid-1; i++ ) { |
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ch = *buf++; |
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if( ch == '\n' ) { |
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uid[i] = '\0'; |
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break; |
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} |
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uid[i] = ch; |
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} |
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memcpy( usedkey, buf, 16 ); |
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usedkey[16] = '\0'; |
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buf += 17; |
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memcpy( mainkey, buf, 16 ); |
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mainkey[16] = '\0'; |
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buf += 17; |
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if( !buf ) |
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BUG( NULL ); |
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algo = atol( buf ); |
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free_if_alloc( buffer ); |
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|
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uid2 = utf8_to_wincp (uid, strlen (uid)); |
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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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uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ), |
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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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uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ), |
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usedkey+8 ); |
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free( uid2 ); |
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} /* parse_gpg_describtion */ |
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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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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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const char * |
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passphrase_cb( void * opaque, const char * desc, void * r_hd ) |
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{ |
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passphrase_cb_s * c = (passphrase_cb_s *)opaque; |
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void * item; |
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const char * pass, * keyid; |
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int rc = 0; |
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|
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if( !c ) |
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return NULL; |
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|
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if( desc ) { |
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keyid = parse_gpg_keyid( desc ); |
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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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return pass; |
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} |
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} |
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|
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if( c->pwd_init ) { |
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c->keyid = keyid; |
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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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/*log_box( "", 0, "%s %d %d", desc,strlen( desc), is_hexstring( desc ) );*/ |
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if( desc && strlen( desc ) == 32 && !is_hexstring( desc ) ) { |
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char buf[16]; |
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memset( buf, 0, sizeof buf ); |
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strncpy( buf, desc+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( desc ) { |
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strcpy( c->info, desc ); |
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parse_gpg_description( c->info, sizeof c->info - 1 ); |
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} |
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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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return NULL; |
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c->pwd_init = 0; |
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} |
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|
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if( c->cancel ) |
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return NULL; |
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|
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return c->pwd; |
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} /* passphrase_cb */ |
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|
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|
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void |
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set_gpg_passphrase_cb( gpgme_ctx_t c, passphrase_cb_s * ctx, int cmd, |
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HWND hwnd, const char * title ) |
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{ |
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ctx->gpg_cmd = cmd; |
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ctx->is_card = 0; |
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ctx->cancel = 0; |
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ctx->hwnd = hwnd; |
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ctx->pwd_init = 1; |
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if( strlen( title ) > 256 ) |
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BUG( NULL ); /* check bounds */ |
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strcpy( ctx->title, title ); |
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gpgme_set_passphrase_cb( c, passphrase_cb, ctx ); |
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} /* set_gpg_passphrase_cb */ |
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