/[winpt]/trunk/Src/wptPassphraseCB.cpp
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revision 2 by twoaday, Mon Jan 31 11:02:21 2005 UTC revision 95 by twoaday, Thu Nov 24 12:09:28 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, IDC_DECRYPT_HIDE, _("&Hide Typing"));
84                                 s? s + 8 : "DEADBEEF" );          SetWindowText (dlg, c->title);
85                  listbox_add_string( GetDlgItem( dlg, IDC_DECRYPT_LIST ), info );          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
86              }              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
87              gpgme_recipients_enum_close( c->enc_to, &ctx );                              _("Encrypted with the following public key(s)"));
88          }              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
89          SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?          }
90                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,          else if (c->gpg_cmd == GPG_CMD_SIGN) {
91                          _("Please enter your passphrase") );              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
92          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
93              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );          }
94              SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );          if (c->recipients)
95          }              recip = c->recipients; /* recipients were already extracted. */
96          else {          else {
97              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );              /* XXX: not all ENCRYPT_TO entries are listed here. */
98              SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );              res = gpgme_op_decrypt_result (c->gpg);
99          }              if (res && res->recipients)
100          center_window( dlg );                  recip = res->recipients;
101          SetForegroundWindow( dlg );          }
102          set_active_window( dlg );          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
103          return FALSE;              for (r = res->recipients; r; r = r->next) {
104                    get_pubkey (r->keyid, &key);
105          case WM_SYSCOMMAND:                  if (key) {
106              if( LOWORD( wparam ) == SC_CLOSE ) {                      char *uid;
107                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );                      id = key->uids->name;
108                  c->cancel = 1;                      if (!id)
109                  EndDialog( dlg, TRUE );                          id = _("Invalid User ID");
110              }                      uid = utf8_to_wincp (id, strlen (id));
111              return FALSE;                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1
112                                         + strlen (key->uids->email)+1];
113          case WM_COMMAND:                      if (!info)
114              switch( HIWORD( wparam ) ) {                          BUG (NULL);
115              case BN_CLICKED:                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,
116                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
117                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                      free (uid);
118                      HWND hwnd;                      
119                      yes ^= 1;                  }
120                      hwnd = GetDlgItem( dlg, item_ctrl_id( c->gpg_cmd ) );                  else {
121                      SendMessage( hwnd, EM_SETPASSWORDCHAR, yes? '*' : 0, 0 );                      info = new char [32 + strlen (r->keyid)+1 + 4];
122                      SetFocus( hwnd );                      if (!info)
123                  }                          BUG (NULL);
124              }                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
125                                 get_key_pubalgo (r->pubkey_algo), r->keyid+8);
126              switch( LOWORD( wparam ) ) {                  }
127              case IDOK:                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
128                  /* fixme: the item is even cached when the passphrase is not                  free_if_alloc (info);
129                            correct, which means that the user needs to delete all              }
130                            cached entries to continue. */          }
131                  GetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), c->pwd, sizeof c->pwd -1 );          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
132                  if( reg_prefs.cache_time > 0 && !c->is_card ) {              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
133                      if( agent_get_cache( c->keyid, &item ) )                              SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
134                          agent_unlock_cache_entry( &item );                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
135                      else                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
136                          agent_put_cache( c->keyid, c->pwd, reg_prefs.cache_time );                          _("Please enter your passphrase"));
137                  }          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
138                  EndDialog( dlg, TRUE );              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
139                  return TRUE;              if (res && !res->recipients) {
140                                    const char *s = _("Symmetric encryption.\n"
141              case IDCANCEL:                                    "%s encrypted data.");
142                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), ""  );                  const char *alg = get_symkey_algo (c->sym.sym_algo);
143                  c->cancel = 1;                  info = new char[strlen (s) + strlen (alg) + 2];
144                  EndDialog( dlg, FALSE );                  if (!info)
145                  return FALSE;                      BUG (NULL);
146              }                  sprintf (info, s, alg);
147              break;                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
148      }                  free_if_alloc (info);
149                    }
150      return FALSE;              else
151  } /* passphrase_callback_proc */                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
152            }
153            else {
154  static const char *              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
155  parse_gpg_keyid( const char * desc )              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
156  {          }
157      static char keyid[16+1];          center_window (dlg, NULL);
158      char * p;          SetForegroundWindow (dlg);
159                set_active_window (dlg);
160      p = strrchr( desc, '\n' );          return FALSE;
161      if( !p )  
162          return NULL;          case WM_SYSCOMMAND:
163      /* the format of the desc buffer looks like this:              if (LOWORD (wparam) == SC_CLOSE) {
164         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
165         we use the main keyid to use only one cache entry. */                  c->cancel = 1;
166      strncpy( keyid, desc+(p-desc+1+17), 16 );                  EndDialog (dlg, TRUE);
167      return keyid;              }
168  } /* parse_gpg_keyid */              break;
169    
170            case WM_COMMAND:
171  static void              switch (HIWORD (wparam)) {
172  parse_gpg_description( char * desc, int size )              case BN_CLICKED:
173  {                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
174      char * buffer = NULL, ch, uid[128] = {0}, * uid2 = NULL;                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
175      char usedkey[16+1] = {0}, mainkey[16+1] = {0};                      HWND hwnd;
176      const char * buf;                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
177      int i, algo, try_again = 0;                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
178                        SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
179      if( stristr( desc, "[User ID hint missing]" )                      SetFocus (hwnd);
180          || stristr( desc, "[passphrase info missing]" ) ) {                  }
181          _snprintf( desc, size-1,              }
182                     _("You need a passphrase to unlock the secret key for\n"  
183                       "user: [UserID hint missing]\n"              switch (LOWORD (wparam)) {
184                       "      [passphrase info missing]\n") );              case IDOK:  
185          return;                  /* XXX: the item is even cached when the passphrase is not
186      }                          correct, which means that the user needs to delete all
187                            cached entries to continue. */
188      buffer = new char[size+1];                  if (c->pwd)
189      if( !buffer )                      burn_passphrase (&c->pwd);
190          BUG( NULL );                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
191      strcpy( buffer, desc );                  if (!n) {
192      buf = buffer;                      c->pwd = new char[2];
193      if( strstr( buf, "TRY_AGAIN" ) ) {                      if (!c->pwd)
194          buf += strlen( "TRY_AGAIN\n" );                          BUG (NULL);
195          try_again = 1;                      strcpy (c->pwd, "");
196      }                  }
197      else if( strstr( buf, "ENTER_PASSPHRASE" ) )                  else {
198          buf += strlen( "ENTER_PASSPHRASE\n" );                      c->pwd = new char[n+2];
199      else                      if (!c->pwd)
200          BUG( NULL );                          BUG (NULL);
201      buf += 17;                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
202      for( i = 0; i < sizeof uid-1; i++ ) {                  }
203          ch = *buf++;                  res = gpgme_op_decrypt_result (c->gpg);
204          if( ch == '\n' ) {                  if (!res)
205              uid[i] = '\0';                      res_sig = gpgme_op_sign_result (c->gpg);            
206              break;                  if (reg_prefs.cache_time > 0 && !c->is_card &&
207          }                      (res || res_sig)) {
208          uid[i] = ch;                      if (agent_get_cache (c->keyid, &item))                      
209      }                          agent_unlock_cache_entry (&item);
210      memcpy( usedkey, buf, 16 );                      else
211      usedkey[16] = '\0';                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
212      buf += 17;                  }
213      memcpy( mainkey, buf, 16 );                  c->cancel = 0;
214      mainkey[16] = '\0';                  EndDialog (dlg, TRUE);
215      buf += 17;                  return TRUE;
216      if( !buf )                  
217          BUG( NULL );              case IDCANCEL:
218      algo = atol( buf );                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
219      free_if_alloc( buffer );                  c->cancel = 1;
220                    EndDialog (dlg, FALSE);
221      uid2 = utf8_to_wincp (uid, strlen (uid));                  return FALSE;
222                }
223      if( strcmp( usedkey, mainkey ) )              break;
224          _snprintf( desc, size-1,      }
225                     _("You need a passphrase to unlock the secret key for\n"      
226                       "user: \"%s\"\n"      return FALSE;
227                       "%s key, ID %s (main key ID %s)\n"),  }
228                     uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),  
229                     usedkey+8, mainkey+8 );  
230      else if( !strcmp( usedkey, mainkey ) )  /* Extract the main keyid from @pass_info.
231          _snprintf( desc, size-1,     Return value: long main keyid or NULL for an error. */
232                     _("You need a passphrase to unlock the secret key for\n"  static const char*
233                       "user: \"%s\"\n"  parse_gpg_keyid (const char *pass_info)
234                       "%s key, ID %s\n"),  {
235                       uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),      static char keyid[16+1];
236                       usedkey+8 );      
237      free( uid2 );      /* XXX: check for leading alpha-chars? */
238  } /* parse_gpg_describtion */      if (strlen (pass_info) < 16) {
239            log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
240            return NULL;
241  static int inline      }
242  is_hexstring( const char * p )      /* the format of the desc buffer looks like this:
243  {         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
244      size_t i;         we use the main keyid to use only one cache entry. */
245      for( i=0; i < strlen( p ); i++ ) {      strncpy (keyid, pass_info+17, 16);
246          if( !isxdigit( p[i] ) )      keyid[16] = 0;
247              return -1;      return keyid;
248      }  }
249      return 0;  
250  }  
251    /* Parse the information in @uid_hint and @pass_info to generate
252       a input message for the user in @desc. */
253  const char *  static int
254  passphrase_cb( void * opaque, const char * desc, void * r_hd )  parse_gpg_description (const char *uid_hint, const char *pass_info,
255  {                           char *desc, int size)
256      passphrase_cb_s * c = (passphrase_cb_s *)opaque;  {
257      void * item;      gpgme_pubkey_algo_t algo;
258      const char * pass, * keyid;      char usedkey[16+1];
259      int rc = 0;      char mainkey[16+1];
260        char *uid, *p;
261      if( !c )      int n=0;
262          return NULL;  
263        algo = (gpgme_pubkey_algo_t)0;
264      if( desc ) {      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
265          keyid = parse_gpg_keyid( desc );      if (strlen (uid_hint) < 17) {
266          pass = agent_get_cache( keyid, &item );          *desc = 0;
267          if( pass ) {          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
268              agent_unlock_cache_entry( &item );          return -1;
269              c->pwd_init = 0;      }
270              return pass;  
271          }      while (p = strsep ((char**)&pass_info, " ")) {
272      }          switch (n++) {
273            case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
274      if( c->pwd_init ) {          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
275          c->keyid = keyid;          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
276          /* if the desc has a length of 32 and only hex digits, we assume a          }
277             smart card has been used. */      }
278          /*log_box( "", 0, "%s %d %d", desc,strlen( desc), is_hexstring( desc ) );*/      uid_hint += 16; /* skip keyid */
279          if( desc && strlen( desc ) == 32 && !is_hexstring( desc ) ) {      uid_hint += 1;  /* space */
280              char buf[16];  
281              memset( buf, 0, sizeof buf );      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
282              strncpy( buf, desc+20, 8 );  
283              _snprintf( c->info, sizeof c->info-1,      if (strcmp (usedkey, mainkey))
284                      _("Please enter the PIN to unlock your secret card key\n"          _snprintf (desc, size-1,
285                        "Card: %s"), buf );                     _("You need a passphrase to unlock the secret key for\n"
286              c->is_card = 1;                       "user: \"%s\"\n"
287          }                       "%s key, ID %s (main key ID %s)\n"),
288          else if( desc ) {                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
289              strcpy( c->info, desc );      else if (!strcmp (usedkey, mainkey))
290              parse_gpg_description( c->info, sizeof c->info - 1 );          _snprintf (desc, size-1,
291          }                     _("You need a passphrase to unlock the secret key for\n"
292          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {                       "user: \"%s\"\n"
293              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,                       "%s key, ID %s\n"),
294                                  (HWND)c->hwnd, passphrase_callback_proc,                       uid, get_key_pubalgo (algo), usedkey+8);
295                                  (LPARAM)c );      free (uid);
296          }      return 0;
297          else if( c->gpg_cmd == GPG_CMD_SIGN ) {  }
298              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,  
299                                  (HWND)c->hwnd, passphrase_callback_proc,  
300                                  (LPARAM)c );  /* Extract the serial number from the card ID @id and return it. */
301          }  const char*
302          if( rc == -1 )  extract_serial_no (const char *id)
303              return NULL;  {
304          c->pwd_init = 0;      static char buf[8];
305      }      char *p;
306    
307      if( c->cancel )      p = strchr (id, '/');
308          return NULL;      if (!p) {
309            log_debug ("extract_serial_no: error '%s'\r\n", id);
310      return c->pwd;          return NULL;
311  } /* passphrase_cb */      }
312        strncpy (buf, id+(p-id)-6, 6);
313        return buf;
314  void  }
315  set_gpg_passphrase_cb( gpgme_ctx_t c, passphrase_cb_s * ctx, int cmd,  
316                         HWND hwnd, const char * title )  
317  {  /* Passphrase callback with the ability to support caching. */
318      ctx->gpg_cmd = cmd;  gpgme_error_t
319      ctx->is_card = 0;  passphrase_cb (void *hook, const char *uid_hint,
320      ctx->cancel = 0;                 const char *passphrase_info,
321      ctx->hwnd = hwnd;                 int prev_was_bad, int fd)
322      ctx->pwd_init = 1;  {
323      if( strlen( title ) > 256 )      passphrase_cb_s *c = (passphrase_cb_s*)hook;
324          BUG( NULL ); /* check bounds */      HANDLE hd = (HANDLE)fd;
325      strcpy( ctx->title, title );      void *item;
326      gpgme_set_passphrase_cb( c, passphrase_cb, ctx );      const char *keyid=NULL, *pass;
327  } /* set_gpg_passphrase_cb */      DWORD n;
328        int rc = 0;
329    
330        if (!c) {
331            log_debug ("passphrase_cb: error '!c'\r\n");
332            return gpg_error (GPG_ERR_INV_ARG);
333        }
334        c->bad_pwd = prev_was_bad? 1 : 0;
335        if (prev_was_bad && !c->cancel) {
336            if (c->pwd)
337                burn_passphrase (&c->pwd);
338            agent_del_cache (c->keyid);
339            c->pwd_init = 1;
340        }
341    
342        if (passphrase_info) {
343            if (strlen (passphrase_info) < 16 &&
344                !strstr (passphrase_info, "OPENPGP")) {
345                /* assume symetric encryption. */
346                int pos=2;
347                c->sym.sym_algo = atoi (passphrase_info);
348                if (c->sym.sym_algo > 9)
349                    pos++;
350                /* XXX: be more strict. */
351                c->sym.s2k_mode = atoi (passphrase_info+pos);
352                c->sym.s2k_hash = atoi (passphrase_info+pos+2);
353            }
354    
355            keyid = parse_gpg_keyid (passphrase_info);
356            pass = agent_get_cache (keyid+8, &item);        
357            if (pass) {
358                agent_unlock_cache_entry (&item);
359                c->pwd_init = 0;
360                if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
361                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
362                if (!WriteFile (hd, "\n", 1, &n, NULL))
363                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
364                return 0;
365            }
366        }
367    
368        if (c->pwd_init) {
369            if (keyid && strlen (keyid) == 16)
370                strcpy (c->keyid, keyid+8);
371    
372            /* if @passphrase_info contains 'OPENPGP' we assume a smart card
373                has been used. */
374            if (strstr (passphrase_info, "OPENPGP")) {
375                const char *s=passphrase_info;
376                while (s && *s && *s != 'D')
377                    s++;
378                _snprintf (c->info, sizeof c->info-1,
379                           _("Please enter the PIN to unlock your secret card key\n"
380                             "Card: %s"), extract_serial_no (s));
381                c->is_card = 1;
382            }
383            else if (uid_hint)
384                parse_gpg_description (uid_hint, passphrase_info,
385                                       c->info, sizeof c->info - 1);
386            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
387                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
388                                     (HWND)c->hwnd, passphrase_callback_proc,
389                                     (LPARAM)c);
390            }
391            else if (c->gpg_cmd == GPG_CMD_SIGN) {
392                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
393                                     (HWND)c->hwnd, passphrase_callback_proc,
394                                     (LPARAM)c);
395            }
396            if (rc == -1) {
397                if (!WriteFile (hd, "\n", 1, &n, NULL))
398                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
399                return 0;
400            }
401            c->pwd_init = 0;
402        }
403        if (c->cancel) {
404            if (!WriteFile (hd, "\n", 1, &n, NULL))
405                log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
406            return 0;
407        }
408    
409        if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
410            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
411        if (!WriteFile (hd, "\n", 1, &n, NULL))
412            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
413        return 0;
414    }
415    
416    
417    /* Initialize the given passphrase callback @cb with the
418       used gpgme context @ctx, the command @cmd and a title
419       @title for the dialog. */
420    void
421    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
422                           int cmd, HWND hwnd, const char *title)
423    {
424        memset (cb, 0, sizeof *cb);
425        cb->gpg_cmd = cmd;
426        cb->bad_pwd = 0;
427        cb->is_card = 0;
428        cb->cancel = 0;
429        cb->hwnd = hwnd;
430        cb->pwd_init = 1;
431        free_if_alloc (cb->title);
432        cb->title = m_strdup (title);
433        if (!cb->title)
434            BUG (NULL);
435        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
436        cb->gpg = ctx;
437    }
438    
439    
440    /* Release a passphrase callback @ctx. */
441    void
442    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
443    {
444        gpgme_recipient_t r, n;
445    
446        if (!ctx)
447            return;
448        sfree_if_alloc (ctx->pwd);
449        free_if_alloc (ctx->title);
450        r = ctx->recipients;
451        while (r) {
452            n = r->next;
453            safe_free (r->keyid);
454            safe_free (r);
455            r = n;
456        }
457    }
458    
459    
460    /* Simple check to measure passphrase (@pass) quality.
461       Return value: 0 on success. */
462    int
463    check_passwd_quality (const char *pass, int strict)
464    {
465        int i, nd=0, nc=0, n;
466    
467        n = strlen (pass);
468        if (n < 8)
469            return -1;
470    
471        for (i=0; i < n; i++) {
472            if (isdigit (pass[i]))
473                nd++;
474            if (isalpha (pass[i]))
475                nc++;
476        }
477    
478        /* check that the passphrase contains letters and numbers. */
479        if (nd == n || nc == n)
480            return -1;
481    
482        return 0;
483    }
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