/[winpt]/trunk/Src/wptPassphraseCB.cpp
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revision 2 by twoaday, Mon Jan 31 11:02:21 2005 UTC revision 105 by twoaday, Wed Nov 30 10:22:00 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 <ctype.h>
28  #include "wptGPG.h"  
29  #include "wptCommonCtl.h"  #include "resource.h"
30  #include "wptContext.h"  #include "wptNLS.h"
31  #include "wptDlgs.h"  #include "wptW32API.h"
32  #include "wptUTF8.h"  #include "wptVersion.h"
33  #include "wptErrors.h"  #include "wptGPG.h"
34  #include "wptTypes.h"  #include "wptCommonCtl.h"
35  #include "wptAgent.h"  #include "wptContext.h"
36  #include "wptRegistry.h"  #include "wptDlgs.h"
37    #include "wptUTF8.h"
38    #include "wptErrors.h"
39  #define item_ctrl_id( cmd ) \  #include "wptTypes.h"
40      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)  #include "wptKeylist.h"
41    #include "wptAgent.h"
42    #include "wptRegistry.h"
43  BOOL CALLBACK  
44  passphrase_callback_proc( HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam )  const char* get_symkey_algo (int algo);
45  {      
46      static passphrase_cb_s * c;  #define item_ctrl_id( cmd ) \
47      static int yes = 1;      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
48      gpgme_key_t key;  
49      const char * s, * id;  #define item_ctrl_id2(cmd) \
50      char info[768] = {0};      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
51      void * ctx = NULL, * item;  
52      unsigned int pkalgo;  
53    /* Overwrite passphrase and free memory. */
54      switch( msg )  {  static void
55      case WM_INITDIALOG:  burn_passphrase (char **pwd)
56          c = (passphrase_cb_s *)lparam;  {
57          if( !c )      char *pass = *pwd;
58              BUG( NULL );      wipememory (pass, strlen (pass));
59          SetWindowText( dlg, c->title );      delete []pass;
60          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {      *pwd = NULL;
61              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,  }
62                  _("Encrypted with the following public key(s)") );  
63              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );  
64          }  /* Dialog procedure for the passphrase callback. */
65          else if( c->gpg_cmd == GPG_CMD_SIGN )  static BOOL CALLBACK
66              CheckDlgButton( dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED );  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
67          if( c->enc_to && c->gpg_cmd == GPG_CMD_DECRYPT ) {  {    
68              gpgme_recipients_enum_open( c->enc_to, &ctx );      static passphrase_cb_s *c;
69              while ( (s = gpgme_recipients_enum_read( c->enc_to, &ctx )) ) {      gpgme_decrypt_result_t res=NULL;
70                  pkalgo = *s; s++;      gpgme_sign_result_t res_sig=NULL;
71                  get_pubkey( s, &key );      gpgme_key_t key;
72                  if( key ) {      gpgme_recipient_t recip=NULL, r;
73                      char * uid = NULL;      void *item;
74                      id = gpgme_key_get_string_attr( key, GPGME_ATTR_USERID, NULL, 0 );      const char *id;
75                      if( !id )      char *info;
76                          id = _("Invalid User ID");      int n;
77                      uid = utf8_to_wincp (id, strlen (id));                  
78                      _snprintf( info, sizeof info - 1, "%s (%s, 0x%s)", uid,      switch (msg) {
79                                  gpgme_key_expand_attr( GPGME_ATTR_ALGO, pkalgo ), s+8 );      case WM_INITDIALOG:
80                      free( uid );          c = (passphrase_cb_s *)lparam;
81                  }          if (!c)
82                  else              BUG (0);
83                      _snprintf( info, sizeof info - 1, _("Unknown (key ID 0x%s)"),          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
84                                 s? s + 8 : "DEADBEEF" );          SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
85                  listbox_add_string( GetDlgItem( dlg, IDC_DECRYPT_LIST ), info );          SetWindowText (dlg, c->title);
86              }          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
87              gpgme_recipients_enum_close( c->enc_to, &ctx );              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
88          }                              _("Encrypted with the following public key(s)"));
89          SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
90                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,          }
91                          _("Please enter your passphrase") );          else if (c->gpg_cmd == GPG_CMD_SIGN) {
92          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
93              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
94              SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );          }
95          }          if (c->recipients)
96          else {              recip = c->recipients; /* recipients were already extracted. */
97              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );          else {
98              SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );              /* XXX: not all ENCRYPT_TO entries are listed here. */
99          }              res = gpgme_op_decrypt_result (c->gpg);
100          center_window( dlg );              if (res && res->recipients)
101          SetForegroundWindow( dlg );                  recip = res->recipients;
102          set_active_window( dlg );          }
103          return FALSE;          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
104                for (r = res->recipients; r; r = r->next) {
105          case WM_SYSCOMMAND:                  get_pubkey (r->keyid, &key);
106              if( LOWORD( wparam ) == SC_CLOSE ) {                  if (key) {
107                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );                      char *uid;
108                  c->cancel = 1;                      id = key->uids->name;
109                  EndDialog( dlg, TRUE );                      if (!id)
110              }                          id = _("Invalid User ID");
111              return FALSE;                      uid = utf8_to_wincp (id, strlen (id));
112                        info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1
113          case WM_COMMAND:                                       + strlen (key->uids->email)+1];
114              switch( HIWORD( wparam ) ) {                      if (!info)
115              case BN_CLICKED:                          BUG (NULL);
116                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,
117                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
118                      HWND hwnd;                      free (uid);
119                      yes ^= 1;                      
120                      hwnd = GetDlgItem( dlg, item_ctrl_id( c->gpg_cmd ) );                  }
121                      SendMessage( hwnd, EM_SETPASSWORDCHAR, yes? '*' : 0, 0 );                  else {
122                      SetFocus( hwnd );                      info = new char [32 + strlen (r->keyid)+1 + 4];
123                  }                      if (!info)
124              }                          BUG (NULL);
125                        sprintf (info, _("Unknown key ID (%s, 0x%s)"),
126              switch( LOWORD( wparam ) ) {                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
127              case IDOK:                  }
128                  /* fixme: the item is even cached when the passphrase is not                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
129                            correct, which means that the user needs to delete all                  free_if_alloc (info);
130                            cached entries to continue. */              }
131                  GetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), c->pwd, sizeof c->pwd -1 );          }
132                  if( reg_prefs.cache_time > 0 && !c->is_card ) {          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
133                      if( agent_get_cache( c->keyid, &item ) )                                  EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
134                          agent_unlock_cache_entry( &item );          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
135                      else                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
136                          agent_put_cache( c->keyid, c->pwd, reg_prefs.cache_time );                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
137                  }                          _("Please enter your passphrase"));
138                  EndDialog( dlg, TRUE );          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
139                  return TRUE;              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
140                                if (res && !res->recipients) {
141              case IDCANCEL:                  const char *s = _("Symmetric encryption.\n"
142                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), ""  );                                    "%s encrypted data.");
143                  c->cancel = 1;                  const char *alg = get_symkey_algo (c->sym.sym_algo);
144                  EndDialog( dlg, FALSE );                  info = new char[strlen (s) + strlen (alg) + 2];
145                  return FALSE;                  if (!info)
146              }                      BUG (NULL);
147              break;                  sprintf (info, s, alg);
148      }                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
149                        free_if_alloc (info);
150      return FALSE;              }
151  } /* passphrase_callback_proc */              else
152                    SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
153            }
154  static const char *          else {
155  parse_gpg_keyid( const char * desc )              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
156  {              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
157      static char keyid[16+1];          }
158      char * p;          center_window (dlg, NULL);
159                SetForegroundWindow (dlg);
160      p = strrchr( desc, '\n' );          set_active_window (dlg);
161      if( !p )          return FALSE;
162          return NULL;  
163      /* the format of the desc buffer looks like this:          case WM_SYSCOMMAND:
164         request_keyid[16] main_keyid[16] keytype[1] keylength[4]              if (LOWORD (wparam) == SC_CLOSE) {
165         we use the main keyid to use only one cache entry. */                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
166      strncpy( keyid, desc+(p-desc+1+17), 16 );                  c->cancel = 1;
167      return keyid;                  EndDialog (dlg, TRUE);
168  } /* parse_gpg_keyid */              }
169                break;
170    
171  static void          case WM_COMMAND:
172  parse_gpg_description( char * desc, int size )              switch (HIWORD (wparam)) {
173  {              case BN_CLICKED:
174      char * buffer = NULL, ch, uid[128] = {0}, * uid2 = NULL;                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
175      char usedkey[16+1] = {0}, mainkey[16+1] = {0};                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
176      const char * buf;                      HWND hwnd;
177      int i, algo, try_again = 0;                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
178                        hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
179      if( stristr( desc, "[User ID hint missing]" )                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
180          || stristr( desc, "[passphrase info missing]" ) ) {                      SetFocus (hwnd);
181          _snprintf( desc, size-1,                  }
182                     _("You need a passphrase to unlock the secret key for\n"              }
183                       "user: [UserID hint missing]\n"  
184                       "      [passphrase info missing]\n") );              switch (LOWORD (wparam)) {
185          return;              case IDOK:  
186      }                  /* XXX: the item is even cached when the passphrase is not
187                            correct, which means that the user needs to delete all
188      buffer = new char[size+1];                          cached entries to continue. */
189      if( !buffer )                  if (c->pwd)
190          BUG( NULL );                      burn_passphrase (&c->pwd);
191      strcpy( buffer, desc );                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
192      buf = buffer;                  if (!n) {
193      if( strstr( buf, "TRY_AGAIN" ) ) {                      c->pwd = new char[2];
194          buf += strlen( "TRY_AGAIN\n" );                      if (!c->pwd)
195          try_again = 1;                          BUG (NULL);
196      }                      strcpy (c->pwd, "");
197      else if( strstr( buf, "ENTER_PASSPHRASE" ) )                  }
198          buf += strlen( "ENTER_PASSPHRASE\n" );                  else {
199      else                      c->pwd = new char[n+2];
200          BUG( NULL );                      if (!c->pwd)
201      buf += 17;                          BUG (NULL);
202      for( i = 0; i < sizeof uid-1; i++ ) {                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
203          ch = *buf++;                  }
204          if( ch == '\n' ) {                  res = gpgme_op_decrypt_result (c->gpg);
205              uid[i] = '\0';                  if (!res)
206              break;                      res_sig = gpgme_op_sign_result (c->gpg);            
207          }                  if (reg_prefs.cache_time > 0 && !c->is_card &&
208          uid[i] = ch;                      (res || res_sig)) {
209      }                      if (agent_get_cache (c->keyid, &item))                      
210      memcpy( usedkey, buf, 16 );                          agent_unlock_cache_entry (&item);
211      usedkey[16] = '\0';                      else
212      buf += 17;                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
213      memcpy( mainkey, buf, 16 );                  }
214      mainkey[16] = '\0';                  c->cancel = 0;
215      buf += 17;                  EndDialog (dlg, TRUE);
216      if( !buf )                  return TRUE;
217          BUG( NULL );                  
218      algo = atol( buf );              case IDCANCEL:
219      free_if_alloc( buffer );                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
220                    c->cancel = 1;
221      uid2 = utf8_to_wincp (uid, strlen (uid));                  EndDialog (dlg, FALSE);
222                    return FALSE;
223      if( strcmp( usedkey, mainkey ) )              }
224          _snprintf( desc, size-1,              break;
225                     _("You need a passphrase to unlock the secret key for\n"      }
226                       "user: \"%s\"\n"      
227                       "%s key, ID %s (main key ID %s)\n"),      return FALSE;
228                     uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),  }
229                     usedkey+8, mainkey+8 );  
230      else if( !strcmp( usedkey, mainkey ) )  
231          _snprintf( desc, size-1,  /* Extract the main keyid from @pass_info.
232                     _("You need a passphrase to unlock the secret key for\n"     Return value: long main keyid or NULL for an error. */
233                       "user: \"%s\"\n"  static const char*
234                       "%s key, ID %s\n"),  parse_gpg_keyid (const char *pass_info)
235                       uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),  {
236                       usedkey+8 );      static char keyid[16+1];
237      free( uid2 );      
238  } /* parse_gpg_describtion */      /* XXX: check for leading alpha-chars? */
239        if (strlen (pass_info) < 16) {
240            log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
241  static int inline          return NULL;
242  is_hexstring( const char * p )      }
243  {      /* the format of the desc buffer looks like this:
244      size_t i;         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
245      for( i=0; i < strlen( p ); i++ ) {         we use the main keyid to use only one cache entry. */
246          if( !isxdigit( p[i] ) )      strncpy (keyid, pass_info+17, 16);
247              return -1;      keyid[16] = 0;
248      }      return keyid;
249      return 0;  }
250  }  
251    
252    /* Parse the information in @uid_hint and @pass_info to generate
253  const char *     a input message for the user in @desc. */
254  passphrase_cb( void * opaque, const char * desc, void * r_hd )  static int
255  {    parse_gpg_description (const char *uid_hint, const char *pass_info,
256      passphrase_cb_s * c = (passphrase_cb_s *)opaque;                         char *desc, int size)
257      void * item;  {
258      const char * pass, * keyid;      gpgme_pubkey_algo_t algo;
259      int rc = 0;      char usedkey[16+1];
260        char mainkey[16+1];
261      if( !c )      char *uid, *p;
262          return NULL;      int n=0;
263    
264      if( desc ) {      algo = (gpgme_pubkey_algo_t)0;
265          keyid = parse_gpg_keyid( desc );      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
266          pass = agent_get_cache( keyid, &item );      if (strlen (uid_hint) < 17) {
267          if( pass ) {          *desc = 0;
268              agent_unlock_cache_entry( &item );          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
269              c->pwd_init = 0;          return -1;
270              return pass;      }
271          }  
272      }      while (p = strsep ((char**)&pass_info, " ")) {
273            switch (n++) {
274      if( c->pwd_init ) {          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
275          c->keyid = keyid;          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
276          /* if the desc has a length of 32 and only hex digits, we assume a          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
277             smart card has been used. */          }
278          /*log_box( "", 0, "%s %d %d", desc,strlen( desc), is_hexstring( desc ) );*/      }
279          if( desc && strlen( desc ) == 32 && !is_hexstring( desc ) ) {      uid_hint += 16; /* skip keyid */
280              char buf[16];      uid_hint += 1;  /* space */
281              memset( buf, 0, sizeof buf );  
282              strncpy( buf, desc+20, 8 );      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
283              _snprintf( c->info, sizeof c->info-1,  
284                      _("Please enter the PIN to unlock your secret card key\n"      if (strcmp (usedkey, mainkey))
285                        "Card: %s"), buf );          _snprintf (desc, size-1,
286              c->is_card = 1;                     _("You need a passphrase to unlock the secret key for\n"
287          }                       "user: \"%s\"\n"
288          else if( desc ) {                       "%s key, ID %s (main key ID %s)\n"),
289              strcpy( c->info, desc );                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
290              parse_gpg_description( c->info, sizeof c->info - 1 );      else if (!strcmp (usedkey, mainkey))
291          }          _snprintf (desc, size-1,
292          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {                     _("You need a passphrase to unlock the secret key for\n"
293              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,                       "user: \"%s\"\n"
294                                  (HWND)c->hwnd, passphrase_callback_proc,                       "%s key, ID %s\n"),
295                                  (LPARAM)c );                       uid, get_key_pubalgo (algo), usedkey+8);
296          }      free (uid);
297          else if( c->gpg_cmd == GPG_CMD_SIGN ) {      return 0;
298              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,  }
299                                  (HWND)c->hwnd, passphrase_callback_proc,  
300                                  (LPARAM)c );  
301          }  /* Extract the serial number from the card ID @id and return it. */
302          if( rc == -1 )  const char*
303              return NULL;  extract_serial_no (const char *id)
304          c->pwd_init = 0;  {
305      }      static char buf[8];
306        char *p;
307      if( c->cancel )  
308          return NULL;      p = strchr (id, '/');
309        if (!p) {
310      return c->pwd;          log_debug ("extract_serial_no: error '%s'\r\n", id);
311  } /* passphrase_cb */          return NULL;
312        }
313        strncpy (buf, id+(p-id)-6, 6);
314  void      return buf;
315  set_gpg_passphrase_cb( gpgme_ctx_t c, passphrase_cb_s * ctx, int cmd,  }
316                         HWND hwnd, const char * title )  
317  {  
318      ctx->gpg_cmd = cmd;  /* Passphrase callback with the ability to support caching. */
319      ctx->is_card = 0;  gpgme_error_t
320      ctx->cancel = 0;  passphrase_cb (void *hook, const char *uid_hint,
321      ctx->hwnd = hwnd;                 const char *passphrase_info,
322      ctx->pwd_init = 1;                 int prev_was_bad, int fd)
323      if( strlen( title ) > 256 )  {
324          BUG( NULL ); /* check bounds */      passphrase_cb_s *c = (passphrase_cb_s*)hook;
325      strcpy( ctx->title, title );      HANDLE hd = (HANDLE)fd;
326      gpgme_set_passphrase_cb( c, passphrase_cb, ctx );      void *item;
327  } /* set_gpg_passphrase_cb */      const char *keyid=NULL, *pass;
328        DWORD n;
329        int rc = 0;
330    
331        if (!c) {
332            log_debug ("passphrase_cb: error '!c'\r\n");
333            return gpg_error (GPG_ERR_INV_ARG);
334        }
335        c->bad_pwd = prev_was_bad? 1 : 0;
336        if (prev_was_bad && !c->cancel) {
337            if (c->pwd)
338                burn_passphrase (&c->pwd);
339            agent_del_cache (c->keyid);
340            c->pwd_init = 1;
341        }
342    
343        if (passphrase_info) {
344            if (strlen (passphrase_info) < 16 &&
345                !strstr (passphrase_info, "OPENPGP")) {
346                /* assume symetric encryption. */
347                int pos=2;
348                c->sym.sym_algo = atoi (passphrase_info);
349                if (c->sym.sym_algo > 9)
350                    pos++;
351                /* XXX: be more strict. */
352                c->sym.s2k_mode = atoi (passphrase_info+pos);
353                c->sym.s2k_hash = atoi (passphrase_info+pos+2);
354            }
355    
356            keyid = parse_gpg_keyid (passphrase_info);
357            pass = agent_get_cache (keyid+8, &item);        
358            if (pass) {
359                agent_unlock_cache_entry (&item);
360                c->pwd_init = 0;
361                if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
362                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
363                if (!WriteFile (hd, "\n", 1, &n, NULL))
364                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
365                return 0;
366            }
367        }
368    
369        if (c->pwd_init) {
370            if (keyid && strlen (keyid) == 16)
371                strcpy (c->keyid, keyid+8);
372    
373            /* if @passphrase_info contains 'OPENPGP' we assume a smart card
374                has been used. */
375            if (strstr (passphrase_info, "OPENPGP")) {
376                const char *s=passphrase_info;
377                while (s && *s && *s != 'D')
378                    s++;
379                _snprintf (c->info, sizeof c->info-1,
380                           _("Please enter the PIN to unlock your secret card key\n"
381                             "Card: %s"), extract_serial_no (s));
382                c->is_card = 1;
383            }
384            else if (uid_hint)
385                parse_gpg_description (uid_hint, passphrase_info,
386                                       c->info, sizeof c->info - 1);
387            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
388                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
389                                     (HWND)c->hwnd, passphrase_callback_proc,
390                                     (LPARAM)c);
391            }
392            else if (c->gpg_cmd == GPG_CMD_SIGN) {
393                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
394                                     (HWND)c->hwnd, passphrase_callback_proc,
395                                     (LPARAM)c);
396            }
397            if (rc == -1) {
398                if (!WriteFile (hd, "\n", 1, &n, NULL))
399                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
400                return 0;
401            }
402            c->pwd_init = 0;
403        }
404        if (c->cancel) {
405            if (!WriteFile (hd, "\n", 1, &n, NULL))
406                log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
407            return 0;
408        }
409    
410        if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
411            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
412        if (!WriteFile (hd, "\n", 1, &n, NULL))
413            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
414        return 0;
415    }
416    
417    
418    /* Initialize the given passphrase callback @cb with the
419       used gpgme context @ctx, the command @cmd and a title
420       @title for the dialog. */
421    void
422    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
423                           int cmd, HWND hwnd, const char *title)
424    {
425        memset (cb, 0, sizeof *cb);
426        cb->gpg_cmd = cmd;
427        cb->bad_pwd = 0;
428        cb->is_card = 0;
429        cb->cancel = 0;
430        cb->hwnd = hwnd;
431        cb->pwd_init = 1;
432        free_if_alloc (cb->title);
433        cb->title = m_strdup (title);
434        if (!cb->title)
435            BUG (NULL);
436        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
437        cb->gpg = ctx;
438    }
439    
440    
441    /* Release a passphrase callback @ctx. */
442    void
443    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
444    {
445        gpgme_recipient_t r, n;
446    
447        if (!ctx)
448            return;
449        sfree_if_alloc (ctx->pwd);
450        free_if_alloc (ctx->title);
451        r = ctx->recipients;
452        while (r) {
453            n = r->next;
454            safe_free (r->keyid);
455            safe_free (r);
456            r = n;
457        }
458    }
459    
460    
461    /* Simple check to measure passphrase (@pass) quality.
462       Return value: 0 on success. */
463    int
464    check_passwd_quality (const char *pass, int strict)
465    {
466        int i, nd=0, nc=0, n;
467    
468        n = strlen (pass);
469        if (n < 8)
470            return -1;
471    
472        for (i=0; i < n; i++) {
473            if (isdigit (pass[i]))
474                nd++;
475            if (isalpha (pass[i]))
476                nc++;
477        }
478    
479        /* check that the passphrase contains letters and numbers. */
480        if (nd == n || nc == n)
481            return -1;
482    
483        return 0;
484    }
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