/[winpt]/trunk/Src/wptPassphraseCB.cpp
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revision 4 by twoaday, Sun Feb 6 11:11:40 2005 UTC revision 47 by werner, Mon Oct 31 14:04:59 2005 UTC
# Line 1  Line 1 
1  /* wptPassphraseCB.cpp - GPGME Passphrase Callback  /* wptPassphraseCB.cpp - GPGME Passphrase Callback
2   *      Copyright (C) 2001, 2002, 2003 Timo Schulz   *      Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz
3   *   *      Copyright (C) 2005 g10 Code GmbH
4   * This file is part of WinPT.   *
5   *   * This file is part of WinPT.
6   * WinPT is free software; you can redistribute it and/or   *
7   * modify it under the terms of the GNU General Public License   * WinPT is free software; you can redistribute it and/or
8   * as published by the Free Software Foundation; either version 2   * modify it under the terms of the GNU General Public License
9   * of the License, or (at your option) any later version.   * as published by the Free Software Foundation; either version 2
10   *     * of the License, or (at your option) any later version.
11   * WinPT is distributed in the hope that it will be useful,   *  
12   * but WITHOUT ANY WARRANTY; without even the implied warranty of   * WinPT is distributed in the hope that it will be useful,
13   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * General Public License for more details.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   *   * General Public License for more details.
16   * You should have received a copy of the GNU General Public License   *
17   * along with WinPT; if not, write to the Free Software Foundation,   * You should have received a copy of the GNU General Public License
18   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA   * along with WinPT; if not, write to the Free Software Foundation,
19   */   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20     */
21  #include <windows.h>  
22  #include <ctype.h>  #ifdef HAVE_CONFIG_H
23    #include <config.h>
24  #include "../resource.h"  #endif
25  #include "wptNLS.h"  
26  #include "wptW32API.h"  #include <windows.h>
27  #include "wptVersion.h"  #include <windows.h>
28  #include "wptGPG.h"  #include <ctype.h>
29  #include "wptCommonCtl.h"  
30  #include "wptContext.h"  #include "resource.h"
31  #include "wptDlgs.h"  #include "wptNLS.h"
32  #include "wptUTF8.h"  #include "wptW32API.h"
33  #include "wptErrors.h"  #include "wptVersion.h"
34  #include "wptTypes.h"  #include "wptGPG.h"
35  #include "wptAgent.h"  #include "wptCommonCtl.h"
36  #include "wptRegistry.h"  #include "wptContext.h"
37    #include "wptDlgs.h"
38    #include "wptUTF8.h"
39  #define item_ctrl_id( cmd ) \  #include "wptErrors.h"
40      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)  #include "wptTypes.h"
41    #include "wptKeyList.h"
42    #include "wptAgent.h"
43  BOOL CALLBACK  #include "wptRegistry.h"
44  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)  
45  {      const char* get_symkey_algo (int algo);
46      static passphrase_cb_s * c;  
47      static int hide = 1;  #define item_ctrl_id( cmd ) \
48      gpgme_key_t key;      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
49      const char * s, * id;  
50      char info[768] = {0};  #define item_ctrl_id2(cmd) \
51      void * ctx = NULL, * item;      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
52      unsigned int pkalgo;  
53    
54      switch( msg )  {  /* Overwrite passphrase and free memory. */
55      case WM_INITDIALOG:  static void
56          hide = 1;  burn_passphrase (char **pwd)
57          c = (passphrase_cb_s *)lparam;  {
58          if (!c)      char *pass = *pwd;
59              BUG (0);      wipememory (pass, strlen (pass));
60          SetWindowText (dlg, c->title);      delete []pass;
61          if (c->gpg_cmd == GPG_CMD_DECRYPT) {      *pwd = NULL;
62              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,  }
63                  _("Encrypted with the following public key(s)") );  
64              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );  
65          }  /* Dialog procedure for the passphrase callback. */
66          else if( c->gpg_cmd == GPG_CMD_SIGN )  static BOOL CALLBACK
67              CheckDlgButton( dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED );  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
68          if( c->enc_to && c->gpg_cmd == GPG_CMD_DECRYPT ) {  {    
69              gpgme_recipients_enum_open( c->enc_to, &ctx );      static passphrase_cb_s * c;
70              while ( (s = gpgme_recipients_enum_read( c->enc_to, &ctx )) ) {      gpgme_decrypt_result_t res;
71                  pkalgo = *s; s++;      gpgme_sign_result_t res_sig;
72                  get_pubkey( s, &key );      gpgme_key_t key;
73                  if( key ) {      gpgme_recipient_t recip, r;
74                      char * uid = NULL;      void *ctx = NULL, *item;
75                      id = gpgme_key_get_string_attr( key, GPGME_ATTR_USERID, NULL, 0 );      const char *id;
76                      if( !id )      char *info;
77                          id = _("Invalid User ID");      int n;
78                      uid = utf8_to_wincp (id, strlen (id));                  
79                      _snprintf( info, sizeof info - 1, "%s (%s, 0x%s)", uid,      switch (msg) {
80                                  gpgme_key_expand_attr( GPGME_ATTR_ALGO, pkalgo ), s+8 );      case WM_INITDIALOG:
81                      free( uid );          c = (passphrase_cb_s *)lparam;
82                  }          if (!c)
83                  else              BUG (0);
84                      _snprintf( info, sizeof info - 1, _("Unknown (key ID 0x%s)"),          SetWindowText (dlg, c->title);
85                                 s? s + 8 : "DEADBEEF" );          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
86                  listbox_add_string( GetDlgItem( dlg, IDC_DECRYPT_LIST ), info );              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
87              }                              _("Encrypted with the following public key(s)"));
88              gpgme_recipients_enum_close( c->enc_to, &ctx );              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
89          }          }
90          SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?          else if (c->gpg_cmd == GPG_CMD_SIGN)
91                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
92                          _("Please enter your passphrase") );          if (c->recipients)
93          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {              recip = c->recipients; /* recipients were already extracted. */
94              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );          else {
95              SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );              /* XXX: not all ENCRYPT_TO entries are listed here. */
96          }              res = gpgme_op_decrypt_result (c->gpg);
97          else {              if (res && res->recipients)
98              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );                  recip = res->recipients;
99              SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );          }
100          }          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
101          center_window( dlg );              for (r = res->recipients; r; r = r->next) {
102          SetForegroundWindow( dlg );                  get_pubkey (r->keyid, &key);
103          set_active_window( dlg );                  if (key) {
104          return FALSE;                      char *uid;
105                        id = key->uids->name;
106          case WM_SYSCOMMAND:                      if (!id)
107              if( LOWORD( wparam ) == SC_CLOSE ) {                          id = _("Invalid User ID");
108                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );                      uid = utf8_to_wincp (id, strlen (id));
109                  c->cancel = 1;                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1
110                  EndDialog( dlg, TRUE );                                       + strlen (key->uids->email)+1];
111              }                      if (!info)
112              return FALSE;                          BUG (NULL);
113                        sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,
114          case WM_COMMAND:                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
115              switch( HIWORD( wparam ) ) {                      free (uid);
116              case BN_CLICKED:                      
117                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE                  }
118                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                  else {
119                      HWND hwnd;                      info = new char [32 + strlen (r->keyid)+1 + 4];
120                      hide ^= 1;                      if (!info)
121                      hwnd = GetDlgItem( dlg, item_ctrl_id( c->gpg_cmd ) );                          BUG (NULL);
122                      SendMessage( hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0 );                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
123                      SetFocus( hwnd );                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
124                  }                  }
125              }                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
126                    free_if_alloc (info);
127              switch (LOWORD (wparam)) {              }
128              case IDOK:            }
129                  /* fixme: the item is even cached when the passphrase is not          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
130                            correct, which means that the user needs to delete all              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
131                            cached entries to continue. */          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
132                  GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, sizeof (c->pwd) -1);                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
133                  if (reg_prefs.cache_time > 0 && !c->is_card && !strstr (c->keyid, "missing")) {                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
134                      if (agent_get_cache (c->keyid, &item))                          _("Please enter your passphrase"));
135                          agent_unlock_cache_entry (&item);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
136                      else              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
137                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);              if (res && !res->recipients) {
138                  }                  const char *s = _("Symmetric encryption.\n"
139                  EndDialog (dlg, TRUE);                                    "%s encrypted data.");
140                  return TRUE;                  const char *alg = get_symkey_algo (c->sym.sym_algo);
141                                    info = new char[strlen (s) + strlen (alg) + 2];
142              case IDCANCEL:                  if (!info)
143                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                      BUG (NULL);
144                  c->cancel = 1;                  sprintf (info, s, alg);
145                  EndDialog (dlg, FALSE);                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
146                  return FALSE;                  free_if_alloc (info);
147              }              }
148              break;              else
149      }                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
150                }
151      return FALSE;          else {
152  } /* passphrase_callback_proc */              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
153                SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
154            }
155  static const char *          center_window (dlg, NULL);
156  parse_gpg_keyid( const char * desc )          SetForegroundWindow (dlg);
157  {          set_active_window (dlg);
158      static char keyid[16+1];          return FALSE;
159      char * p;  
160                case WM_SYSCOMMAND:
161      p = strrchr( desc, '\n' );              if (LOWORD (wparam) == SC_CLOSE) {
162      if( !p )                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
163          return NULL;                  c->cancel = 1;
164      /* the format of the desc buffer looks like this:                  EndDialog (dlg, TRUE);
165         request_keyid[16] main_keyid[16] keytype[1] keylength[4]              }
166         we use the main keyid to use only one cache entry. */              break;
167      strncpy( keyid, desc+(p-desc+1+17), 16 );  
168      return keyid;          case WM_COMMAND:
169  } /* parse_gpg_keyid */              switch (HIWORD (wparam)) {
170                case BN_CLICKED:
171                    if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
172  static void                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
173  parse_gpg_description( char * desc, int size )                      HWND hwnd;
174  {                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
175      char * buffer = NULL, ch, uid[128] = {0}, * uid2 = NULL;                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
176      char usedkey[16+1] = {0}, mainkey[16+1] = {0};                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
177      const char * buf;                      SetFocus (hwnd);
178      int i, algo, try_again = 0;                  }
179                }
180      if( stristr( desc, "[User ID hint missing]" )  
181          || stristr( desc, "[passphrase info missing]" ) ) {              switch (LOWORD (wparam)) {
182          _snprintf( desc, size-1,              case IDOK:  
183                     _("You need a passphrase to unlock the secret key for\n"                  /* XXX: the item is even cached when the passphrase is not
184                       "user: [UserID hint missing]\n"                          correct, which means that the user needs to delete all
185                       "      [passphrase info missing]\n") );                          cached entries to continue. */
186          return;                  if (c->pwd)
187      }                      burn_passphrase (&c->pwd);
188                    n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
189      buffer = new char[size+1];                  if (!n) {
190      if( !buffer )                      c->pwd = new char[2];
191          BUG( NULL );                      if (!c->pwd)
192      strcpy( buffer, desc );                          BUG (NULL);
193      buf = buffer;                      strcpy (c->pwd, "");
194      if( strstr( buf, "TRY_AGAIN" ) ) {                  }
195          buf += strlen( "TRY_AGAIN\n" );                  else {
196          try_again = 1;                      c->pwd = new char[n+2];
197      }                      if (!c->pwd)
198      else if( strstr( buf, "ENTER_PASSPHRASE" ) )                          BUG (NULL);
199          buf += strlen( "ENTER_PASSPHRASE\n" );                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
200      else                  }
201          BUG( NULL );                  res = gpgme_op_decrypt_result (c->gpg);
202      buf += 17;                  if (!res)
203      for( i = 0; i < sizeof uid-1; i++ ) {                      res_sig = gpgme_op_sign_result (c->gpg);
204          ch = *buf++;                  if (reg_prefs.cache_time > 0 && !c->is_card &&
205          if( ch == '\n' ) {                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {
206              uid[i] = '\0';                      if (agent_get_cache (c->keyid, &item))
207              break;                          agent_unlock_cache_entry (&item);
208          }                      else
209          uid[i] = ch;                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
210      }                  }
211      memcpy( usedkey, buf, 16 );                  c->cancel = 0;
212      usedkey[16] = '\0';                  EndDialog (dlg, TRUE);
213      buf += 17;                  return TRUE;
214      memcpy( mainkey, buf, 16 );                  
215      mainkey[16] = '\0';              case IDCANCEL:
216      buf += 17;                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
217      if( !buf )                  c->cancel = 1;
218          BUG( NULL );                  EndDialog (dlg, FALSE);
219      algo = atol( buf );                  return FALSE;
220      free_if_alloc( buffer );              }
221                break;
222      uid2 = utf8_to_wincp (uid, strlen (uid));      }
223        
224      if( strcmp( usedkey, mainkey ) )      return FALSE;
225          _snprintf( desc, size-1,  }
226                     _("You need a passphrase to unlock the secret key for\n"  
227                       "user: \"%s\"\n"  
228                       "%s key, ID %s (main key ID %s)\n"),  /* Extract the main keyid from @pass_info.
229                     uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),     Return value: long main keyid or NULL for an error. */
230                     usedkey+8, mainkey+8 );  static const char*
231      else if( !strcmp( usedkey, mainkey ) )  parse_gpg_keyid (const char *pass_info)
232          _snprintf( desc, size-1,  {
233                     _("You need a passphrase to unlock the secret key for\n"      static char keyid[16+1];
234                       "user: \"%s\"\n"      
235                       "%s key, ID %s\n"),      /* XXX: check for leading alpha-chars? */
236                       uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),      if (strlen (pass_info) < 16)
237                       usedkey+8 );          return NULL;
238      free( uid2 );      /* the format of the desc buffer looks like this:
239  } /* parse_gpg_describtion */         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
240           we use the main keyid to use only one cache entry. */
241        strncpy (keyid, pass_info+17, 16);
242  static int inline      keyid[16] = 0;
243  is_hexstring( const char * p )      return keyid;
244  {  }
245      size_t i;  
246      for( i=0; i < strlen( p ); i++ ) {  
247          if( !isxdigit( p[i] ) )  /* Parse the information in @uid_hint and @pass_info to generate
248              return -1;     a input message for the user in @desc. */
249      }  static int
250      return 0;  parse_gpg_description (const char *uid_hint, const char *pass_info,
251  }                         char *desc, int size)
252    {
253        gpgme_pubkey_algo_t algo;
254  const char *      char usedkey[16+1];
255  passphrase_cb( void * opaque, const char * desc, void * r_hd )      char mainkey[16+1];
256  {        char *uid, *p;
257      passphrase_cb_s * c = (passphrase_cb_s *)opaque;      int n=0;
258      void * item;  
259      const char * pass, * keyid;      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
260      int rc = 0;      if (strlen (uid_hint) < 17) {
261            *desc = 0;
262      if( !c )          return -1;
263          return NULL;      }
264    
265      if( desc ) {      while (p = strsep ((char**)&pass_info, " ")) {
266          keyid = parse_gpg_keyid( desc );          switch (n++) {
267          pass = agent_get_cache( keyid, &item );          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
268          if( pass ) {          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
269              agent_unlock_cache_entry( &item );          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
270              c->pwd_init = 0;          }
271              return pass;      }
272          }      uid_hint += 16; /* skip keyid */
273      }      uid_hint += 1;  /* space */
274    
275      if( c->pwd_init ) {      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
276          c->keyid = keyid;  
277          /* if the desc has a length of 32 and only hex digits, we assume a      if (strcmp (usedkey, mainkey))
278             smart card has been used. */          _snprintf (desc, size-1,
279          /*log_box( "", 0, "%s %d %d", desc,strlen( desc), is_hexstring( desc ) );*/                     _("You need a passphrase to unlock the secret key for\n"
280          if( desc && strlen( desc ) == 32 && !is_hexstring( desc ) ) {                       "user: \"%s\"\n"
281              char buf[16];                       "%s key, ID %s (main key ID %s)\n"),
282              memset( buf, 0, sizeof buf );                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
283              strncpy( buf, desc+20, 8 );      else if (!strcmp (usedkey, mainkey))
284              _snprintf( c->info, sizeof c->info-1,          _snprintf (desc, size-1,
285                      _("Please enter the PIN to unlock your secret card key\n"                     _("You need a passphrase to unlock the secret key for\n"
286                        "Card: %s"), buf );                       "user: \"%s\"\n"
287              c->is_card = 1;                       "%s key, ID %s\n"),
288          }                       uid, get_key_pubalgo (algo), usedkey+8);
289          else if( desc ) {      free (uid);
290              strcpy( c->info, desc );      return 0;
291              parse_gpg_description( c->info, sizeof c->info - 1 );  }
292          }  
293          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {  
294              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,  /* Extract the serial number from the card ID @id and return it. */
295                                  (HWND)c->hwnd, passphrase_callback_proc,  const char*
296                                  (LPARAM)c );  extract_serial_no (const char *id)
297          }  {
298          else if( c->gpg_cmd == GPG_CMD_SIGN ) {      static char buf[8];
299              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,      char *p;
300                                  (HWND)c->hwnd, passphrase_callback_proc,  
301                                  (LPARAM)c );      p = strchr (id, '/');
302          }      if (!p)
303          if( rc == -1 )          return NULL;
304              return NULL;      strncpy (buf, id+(p-id)-6, 6);
305          c->pwd_init = 0;      return buf;
306      }  }
307    
308      if( c->cancel )  
309          return NULL;  /* Passphrase callback with the ability to support caching. */
310    gpgme_error_t
311      return c->pwd;  passphrase_cb (void *hook, const char *uid_hint,
312  } /* passphrase_cb */                 const char *passphrase_info,
313                   int prev_was_bad, int fd)
314    {
315  void      passphrase_cb_s *c = (passphrase_cb_s*)hook;
316  set_gpg_passphrase_cb( gpgme_ctx_t c, passphrase_cb_s * ctx, int cmd,      HANDLE hd = (HANDLE)fd;
317                         HWND hwnd, const char * title )      void *item;
318  {      const char *keyid, *pass;
319      ctx->gpg_cmd = cmd;      DWORD n;
320      ctx->is_card = 0;      int rc;
321      ctx->cancel = 0;  
322      ctx->hwnd = hwnd;      if (!c)
323      ctx->pwd_init = 1;          return gpg_error (GPG_ERR_INV_ARG);
324      if( strlen( title ) > 256 )      c->bad_pwd = prev_was_bad? 1 : 0;
325          BUG( NULL ); /* check bounds */      if (prev_was_bad && !c->cancel) {
326      strcpy( ctx->title, title );          if (c->pwd)
327      gpgme_set_passphrase_cb( c, passphrase_cb, ctx );              burn_passphrase (&c->pwd);
328  } /* set_gpg_passphrase_cb */          agent_del_cache (c->keyid);
329            c->pwd_init = 1;
330        }
331    
332        if (passphrase_info) {
333            if (strlen (passphrase_info) < 16 &&
334                !strstr (passphrase_info, "OPENPGP")) {
335                /* assume symetric encryption. */
336                int n=2;
337                c->sym.sym_algo = atoi (passphrase_info);
338                if (c->sym.sym_algo > 9)
339                    n++;
340                /* XXX: be more strict. */
341                c->sym.s2k_mode = atoi (passphrase_info+n);
342                c->sym.s2k_hash = atoi (passphrase_info+n+2);
343            }
344    
345            keyid = parse_gpg_keyid (passphrase_info);
346            pass = agent_get_cache (keyid+8, &item);
347            if (pass) {
348                agent_unlock_cache_entry (&item);
349                c->pwd_init = 0;
350                if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
351                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
352                if (!WriteFile (hd, "\n", 1, &n, NULL))
353                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
354                return 0;
355            }
356        }
357    
358        if (c->pwd_init) {
359            if (keyid && strlen (keyid) == 16)
360                strcpy (c->keyid, keyid+8);
361    
362            /* if @passphrase_info contains 'OPENPGP' we assume a smart card
363                has been used. */
364            if (strstr (passphrase_info, "OPENPGP")) {
365                const char *s=passphrase_info;
366                while (s && *s && *s != 'D')
367                    s++;
368                _snprintf (c->info, sizeof c->info-1,
369                           _("Please enter the PIN to unlock your secret card key\n"
370                             "Card: %s"), extract_serial_no (s));
371                c->is_card = 1;
372            }
373            else if (uid_hint)
374                parse_gpg_description (uid_hint, passphrase_info,
375                                       c->info, sizeof c->info - 1);
376            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
377                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
378                                     (HWND)c->hwnd, passphrase_callback_proc,
379                                     (LPARAM)c);
380            }
381            else if (c->gpg_cmd == GPG_CMD_SIGN) {
382                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
383                                     (HWND)c->hwnd, passphrase_callback_proc,
384                                     (LPARAM)c);
385            }
386            if (rc == -1) {
387                if (!WriteFile (hd, "\n", 1, &n, NULL))
388                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
389                return 0;
390            }
391            c->pwd_init = 0;
392        }
393        if (c->cancel) {
394            if (!WriteFile (hd, "\n", 1, &n, NULL))
395                log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
396            return 0;
397        }
398    
399        WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);
400        WriteFile (hd, "\n", 1, &n, NULL);
401        return 0;
402    }
403    
404    
405    /* Initialize the given passphrase callback @cb with the
406       used gpgme context @ctx, the command @cmd and a title
407       @title for the dialog. */
408    void
409    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
410                           int cmd, HWND hwnd, const char *title)
411    {
412        memset (cb, 0, sizeof *cb);
413        cb->gpg_cmd = cmd;
414        cb->bad_pwd = 0;
415        cb->is_card = 0;
416        cb->cancel = 0;
417        cb->hwnd = hwnd;
418        cb->pwd_init = 1;
419        free_if_alloc (cb->title);
420        cb->title = m_strdup (title);
421        if (!cb->title)
422            BUG (NULL);
423        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
424        cb->gpg = ctx;
425    }
426    
427    
428    /* Release a passphrase callback @ctx. */
429    void
430    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
431    {
432        gpgme_recipient_t r, n;
433    
434        if (!ctx)
435            return;
436        sfree_if_alloc (ctx->pwd);
437        free_if_alloc (ctx->title);
438        r = ctx->recipients;
439        while (r) {
440            n = r->next;
441            safe_free (r->keyid);
442            safe_free (r);
443            r = n;
444        }
445    }
446    
447    
448    /* Simple check to measure passphrase (@pass) quality.
449       Return value: 0 on success. */
450    int
451    check_passwd_quality (const char *pass, int strict)
452    {
453        int i, nd=0, nc=0, n;
454    
455        n = strlen (pass);
456        if (n < 8)
457            return -1;
458    
459        for (i=0; i < n; i++) {
460            if (isdigit (pass[i]))
461                nd++;
462            if (isalpha (pass[i]))
463                nc++;
464        }
465    
466        /* check that the passphrase contains letters and numbers. */
467        if (nd == n || nc == n)
468            return -1;
469    
470        return 0;
471    }
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