/[winpt]/trunk/Src/wptPassphraseCB.cpp
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revision 2 by twoaday, Mon Jan 31 11:02:21 2005 UTC revision 205 by twoaday, Thu Apr 27 12:46:03 2006 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, 2006 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 "wptErrors.h"
38    #include "wptTypes.h"
39  #define item_ctrl_id( cmd ) \  #include "wptKeylist.h"
40      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)  #include "wptAgent.h"
41    #include "wptRegistry.h"
42    #include "wptUTF8.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    void ListBox_AddString_utf8 (HWND lb, const char *txt);
54      switch( msg )  {  
55      case WM_INITDIALOG:  /* Overwrite passphrase and free memory. */
56          c = (passphrase_cb_s *)lparam;  static void
57          if( !c )  burn_passphrase (char **pwd)
58              BUG( NULL );  {
59          SetWindowText( dlg, c->title );      char *pass = *pwd;
60          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {      wipememory (pass, strlen (pass));
61              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,      delete []pass;
62                  _("Encrypted with the following public key(s)") );      *pwd = NULL;
63              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );  }
64          }  
65          else if( c->gpg_cmd == GPG_CMD_SIGN )  
66              CheckDlgButton( dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED );  /* Dialog procedure for the passphrase callback. */
67          if( c->enc_to && c->gpg_cmd == GPG_CMD_DECRYPT ) {  static BOOL CALLBACK
68              gpgme_recipients_enum_open( c->enc_to, &ctx );  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
69              while ( (s = gpgme_recipients_enum_read( c->enc_to, &ctx )) ) {  {    
70                  pkalgo = *s; s++;      static passphrase_cb_s *c;
71                  get_pubkey( s, &key );      gpgme_decrypt_result_t res=NULL;
72                  if( key ) {      gpgme_sign_result_t res_sig=NULL;
73                      char * uid = NULL;      gpgme_key_t key;
74                      id = gpgme_key_get_string_attr( key, GPGME_ATTR_USERID, NULL, 0 );      gpgme_recipient_t recip=NULL, r;
75                      if( !id )      void *item;
76                          id = _("Invalid User ID");      const char *id;
77                      uid = utf8_to_wincp (id, strlen (id));                      char *info;
78                      _snprintf( info, sizeof info - 1, "%s (%s, 0x%s)", uid,      int n;
79                                  gpgme_key_expand_attr( GPGME_ATTR_ALGO, pkalgo ), s+8 );  
80                      free( uid );      switch (msg) {
81                  }      case WM_ACTIVATE:
82                  else          safe_edit_control_init (dlg, item_ctrl_id (c->gpg_cmd));
83                      _snprintf( info, sizeof info - 1, _("Unknown (key ID 0x%s)"),          break;
84                                 s? s + 8 : "DEADBEEF" );  
85                  listbox_add_string( GetDlgItem( dlg, IDC_DECRYPT_LIST ), info );      case WM_DESTROY:
86              }          safe_edit_control_free (dlg, item_ctrl_id (c->gpg_cmd));
87              gpgme_recipients_enum_close( c->enc_to, &ctx );          break;
88          }  
89          SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?      case WM_INITDIALOG:
90                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,          c = (passphrase_cb_s *)lparam;
91                          _("Please enter your passphrase") );          if (!c)
92          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {              BUG (0);
93              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
94              SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );          SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
95          }          SetWindowText (dlg, c->title);
96          else {          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
97              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
98              SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );                              _("Encrypted with the following public key(s)"));
99          }              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
100          center_window( dlg );          }
101          SetForegroundWindow( dlg );          else if (c->gpg_cmd == GPG_CMD_SIGN) {
102          set_active_window( dlg );              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
103          return FALSE;              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
104            }
105          case WM_SYSCOMMAND:          /* Because it depends on the order the keys are stored in the
106              if( LOWORD( wparam ) == SC_CLOSE ) {             keyring whether res->recipients is complete or not, we also
107                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );             support that the recipients were externally extracted and then
108                  c->cancel = 1;             we use this list. */
109                  EndDialog( dlg, TRUE );          if (c->recipients)
110              }              recip = c->recipients; /* recipients were already extracted. */
111              return FALSE;          else {
112                res = gpgme_op_decrypt_result (c->gpg);
113          case WM_COMMAND:              if (res && res->recipients)
114              switch( HIWORD( wparam ) ) {                  recip = res->recipients;
115              case BN_CLICKED:          }
116                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
117                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {              for (r = recip; r; r = r->next) {
118                      HWND hwnd;                  get_pubkey (r->keyid, &key);
119                      yes ^= 1;                  if (key) {
120                      hwnd = GetDlgItem( dlg, item_ctrl_id( c->gpg_cmd ) );                      gpgme_user_id_t u = key->uids;
121                      SendMessage( hwnd, EM_SETPASSWORDCHAR, yes? '*' : 0, 0 );  
122                      SetFocus( hwnd );                      id = u->name;
123                  }                      if (!id)
124              }                          id = _("Invalid User ID");
125                        n = 32+strlen (id)+1+4+strlen (r->keyid)+1;
126              switch( LOWORD( wparam ) ) {                      if (u->email)
127              case IDOK:                          n += strlen (u->email)+1;
128                  /* fixme: the item is even cached when the passphrase is not                      info = new char [n+1];
129                            correct, which means that the user needs to delete all                      if (!info)
130                            cached entries to continue. */                          BUG (NULL);
131                  GetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), c->pwd, sizeof c->pwd -1 );                      if (!u->email || strlen (u->email) < 1)
132                  if( reg_prefs.cache_time > 0 && !c->is_card ) {                          sprintf (info, "%s (%s, 0x%s)", id,
133                      if( agent_get_cache( c->keyid, &item ) )                                                       get_key_pubalgo (r->pubkey_algo), r->keyid+8);
134                          agent_unlock_cache_entry( &item );                      else
135                      else                          sprintf (info, "%s <%s> (%s, 0x%s)", id, u->email,
136                          agent_put_cache( c->keyid, c->pwd, reg_prefs.cache_time );                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
137                  }                  }
138                  EndDialog( dlg, TRUE );                  else {
139                  return TRUE;                      info = new char [32 + strlen (r->keyid)+1 + 4];
140                                        if (!info)
141              case IDCANCEL:                          BUG (NULL);
142                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), ""  );                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
143                  c->cancel = 1;                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
144                  EndDialog( dlg, FALSE );                  }
145                  return FALSE;                  ListBox_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
146              }                  free_if_alloc (info);
147              break;              }
148      }          }
149                else if (c->gpg_cmd == GPG_CMD_DECRYPT)
150      return FALSE;              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
151  } /* passphrase_callback_proc */          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
152                            IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
153                            c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
154  static const char *                          _("Please enter your passphrase"));
155  parse_gpg_keyid( const char * desc )          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
156  {              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
157      static char keyid[16+1];              if (res && !res->recipients) {
158      char * p;                  const char *s = _("Symmetric encryption.\n"
159                                          "%s encrypted data.");
160      p = strrchr( desc, '\n' );                  const char *alg = get_symkey_algo (c->sym.sym_algo);
161      if( !p )                  info = new char[strlen (s) + strlen (alg) + 2];
162          return NULL;                  if (!info)
163      /* the format of the desc buffer looks like this:                      BUG (NULL);
164         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                  sprintf (info, s, alg);
165         we use the main keyid to use only one cache entry. */                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
166      strncpy( keyid, desc+(p-desc+1+17), 16 );                  free_if_alloc (info);
167      return keyid;              }
168  } /* parse_gpg_keyid */              else
169                    SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
170            }
171  static void          else {
172  parse_gpg_description( char * desc, int size )              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
173  {              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
174      char * buffer = NULL, ch, uid[128] = {0}, * uid2 = NULL;          }
175      char usedkey[16+1] = {0}, mainkey[16+1] = {0};          center_window (dlg, NULL);
176      const char * buf;          SetForegroundWindow (dlg);
177      int i, algo, try_again = 0;          return FALSE;
178    
179      if( stristr( desc, "[User ID hint missing]" )          case WM_SYSCOMMAND:
180          || stristr( desc, "[passphrase info missing]" ) ) {              if (LOWORD (wparam) == SC_CLOSE) {
181          _snprintf( desc, size-1,                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
182                     _("You need a passphrase to unlock the secret key for\n"                  c->cancel = 1;
183                       "user: [UserID hint missing]\n"                  EndDialog (dlg, TRUE);
184                       "      [passphrase info missing]\n") );              }
185          return;              break;
186      }  
187            case WM_COMMAND:
188      buffer = new char[size+1];              switch (HIWORD (wparam)) {
189      if( !buffer )              case BN_CLICKED:
190          BUG( NULL );                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
191      strcpy( buffer, desc );                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
192      buf = buffer;                      HWND hwnd;
193      if( strstr( buf, "TRY_AGAIN" ) ) {                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
194          buf += strlen( "TRY_AGAIN\n" );                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
195          try_again = 1;                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
196      }                      SetFocus (hwnd);
197      else if( strstr( buf, "ENTER_PASSPHRASE" ) )                  }
198          buf += strlen( "ENTER_PASSPHRASE\n" );              }
199      else  
200          BUG( NULL );              switch (LOWORD (wparam)) {
201      buf += 17;              case IDOK:  
202      for( i = 0; i < sizeof uid-1; i++ ) {                  /* XXX: the item is even cached when the passphrase is not
203          ch = *buf++;                          correct, which means that the user needs to delete all
204          if( ch == '\n' ) {                          cached entries to continue. */
205              uid[i] = '\0';                  if (c->pwd)
206              break;                      burn_passphrase (&c->pwd);
207          }                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
208          uid[i] = ch;                  if (!n) {
209      }                      c->pwd = new char[2];
210      memcpy( usedkey, buf, 16 );                      if (!c->pwd)
211      usedkey[16] = '\0';                          BUG (NULL);
212      buf += 17;                      strcpy (c->pwd, "");
213      memcpy( mainkey, buf, 16 );                  }
214      mainkey[16] = '\0';                  else {
215      buf += 17;                      c->pwd = new char[n+2];
216      if( !buf )                      if (!c->pwd)
217          BUG( NULL );                          BUG (NULL);
218      algo = atol( buf );                      SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd),
219      free_if_alloc( buffer );                                          c->pwd, n+1);
220                    }
221      uid2 = utf8_to_wincp (uid, strlen (uid));                  res = gpgme_op_decrypt_result (c->gpg);
222                    if (!res)
223      if( strcmp( usedkey, mainkey ) )                      res_sig = gpgme_op_sign_result (c->gpg);            
224          _snprintf( desc, size-1,                  if (reg_prefs.cache_time > 0 && !c->is_card &&
225                     _("You need a passphrase to unlock the secret key for\n"                      (res || res_sig)) {
226                       "user: \"%s\"\n"                      if (agent_get_cache (c->keyid, &item))                      
227                       "%s key, ID %s (main key ID %s)\n"),                          agent_unlock_cache_entry (&item);
228                     uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),                      else
229                     usedkey+8, mainkey+8 );                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
230      else if( !strcmp( usedkey, mainkey ) )                  }
231          _snprintf( desc, size-1,                  c->cancel = 0;
232                     _("You need a passphrase to unlock the secret key for\n"                  EndDialog (dlg, TRUE);
233                       "user: \"%s\"\n"                  return TRUE;
234                       "%s key, ID %s\n"),                  
235                       uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),              case IDCANCEL:
236                       usedkey+8 );                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
237      free( uid2 );                  c->cancel = 1;
238  } /* parse_gpg_describtion */                  EndDialog (dlg, FALSE);
239                    return FALSE;
240                }
241  static int inline              break;
242  is_hexstring( const char * p )      }
243  {      
244      size_t i;      return FALSE;
245      for( i=0; i < strlen( p ); i++ ) {  }
246          if( !isxdigit( p[i] ) )  
247              return -1;  
248      }  /* Extract the main keyid from @pass_info.
249      return 0;     Return value: long main keyid or NULL for an error. */
250  }  static const char*
251    parse_gpg_keyid (const char *pass_info)
252    {
253  const char *      static char keyid[16+1];
254  passphrase_cb( void * opaque, const char * desc, void * r_hd )      
255  {        /* XXX: check for leading alpha-chars? */
256      passphrase_cb_s * c = (passphrase_cb_s *)opaque;      if (strlen (pass_info) < 16) {
257      void * item;          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
258      const char * pass, * keyid;          return NULL;
259      int rc = 0;      }
260        /* the format of the desc buffer looks like this:
261      if( !c )         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
262          return NULL;         we use the main keyid to use only one cache entry. */
263        strncpy (keyid, pass_info+17, 16);
264      if( desc ) {      keyid[16] = 0;
265          keyid = parse_gpg_keyid( desc );      return keyid;
266          pass = agent_get_cache( keyid, &item );  }
267          if( pass ) {  
268              agent_unlock_cache_entry( &item );  
269              c->pwd_init = 0;  /* Parse the information in @uid_hint and @pass_info to generate
270              return pass;     a input message for the user in @desc. */
271          }  static int
272      }  parse_gpg_description (const char *uid_hint, const char *pass_info,
273                           char *desc, int size)
274      if( c->pwd_init ) {  {
275          c->keyid = keyid;      gpgme_pubkey_algo_t algo;
276          /* if the desc has a length of 32 and only hex digits, we assume a      char usedkey[16+1];
277             smart card has been used. */      char mainkey[16+1];
278          /*log_box( "", 0, "%s %d %d", desc,strlen( desc), is_hexstring( desc ) );*/      char *p, *uid;
279          if( desc && strlen( desc ) == 32 && !is_hexstring( desc ) ) {      int n=0;
280              char buf[16];  
281              memset( buf, 0, sizeof buf );      algo = (gpgme_pubkey_algo_t)0;
282              strncpy( buf, desc+20, 8 );      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
283              _snprintf( c->info, sizeof c->info-1,      if (strlen (uid_hint) < 17) {
284                      _("Please enter the PIN to unlock your secret card key\n"          *desc = 0;
285                        "Card: %s"), buf );          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
286              c->is_card = 1;          return -1;
287          }      }
288          else if( desc ) {  
289              strcpy( c->info, desc );      while (p = strsep ((char**)&pass_info, " ")) {
290              parse_gpg_description( c->info, sizeof c->info - 1 );          switch (n++) {
291          }          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
292          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
293              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
294                                  (HWND)c->hwnd, passphrase_callback_proc,          }
295                                  (LPARAM)c );      }
296          }      uid_hint += 16; /* skip keyid */
297          else if( c->gpg_cmd == GPG_CMD_SIGN ) {      uid_hint += 1;  /* space */
298              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,  
299                                  (HWND)c->hwnd, passphrase_callback_proc,      uid = utf8_to_native (uid_hint);
300                                  (LPARAM)c );      if (strcmp (usedkey, mainkey))
301          }          _snprintf (desc, size-1,
302          if( rc == -1 )                     _("You need a passphrase to unlock the secret key for\n"
303              return NULL;                       "user: \"%s\"\n"
304          c->pwd_init = 0;                       "%s key, ID %s (main key ID %s)\n"),
305      }                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
306        else if (!strcmp (usedkey, mainkey))
307      if( c->cancel )          _snprintf (desc, size-1,
308          return NULL;                     _("You need a passphrase to unlock the secret key for\n"
309                         "user: \"%s\"\n"
310      return c->pwd;                       "%s key, ID %s\n"),
311  } /* passphrase_cb */                       uid, get_key_pubalgo (algo), usedkey+8);
312        safe_free (uid);
313        return 0;
314  void  }
315  set_gpg_passphrase_cb( gpgme_ctx_t c, passphrase_cb_s * ctx, int cmd,  
316                         HWND hwnd, const char * title )  
317  {  /* Extract the serial number from the card ID @id and return it. */
318      ctx->gpg_cmd = cmd;  const char*
319      ctx->is_card = 0;  extract_serial_no (const char *id)
320      ctx->cancel = 0;  {
321      ctx->hwnd = hwnd;      static char buf[8];
322      ctx->pwd_init = 1;      char *p;
323      if( strlen( title ) > 256 )  
324          BUG( NULL ); /* check bounds */      p = strchr (id, '/');
325      strcpy( ctx->title, title );      if (!p) {
326      gpgme_set_passphrase_cb( c, passphrase_cb, ctx );          log_debug ("extract_serial_no: error '%s'\r\n", id);
327  } /* set_gpg_passphrase_cb */          return NULL;
328        }
329        strncpy (buf, id+(p-id)-6, 6);
330        return buf;
331    }
332    
333    
334    /* Passphrase callback with the ability to support caching. */
335    gpgme_error_t
336    passphrase_cb (void *hook, const char *uid_hint,
337                   const char *passphrase_info,
338                   int prev_was_bad, int fd)
339    {
340        passphrase_cb_s *c = (passphrase_cb_s*)hook;
341        HANDLE hd = (HANDLE)fd;
342        void *item;
343        const char *keyid=NULL, *pass;
344        DWORD n;
345        int rc = 0;
346    
347        if (!c) {
348            log_debug ("passphrase_cb: error '!c'\r\n");
349            return gpg_error (GPG_ERR_INV_ARG);
350        }
351        c->bad_pwd = prev_was_bad? 1 : 0;
352        if (prev_was_bad && !c->cancel) {
353            if (c->pwd)
354                burn_passphrase (&c->pwd);
355            agent_del_cache (c->keyid);
356            c->pwd_init = 1;
357        }
358    
359        if (passphrase_info) {
360            if (strlen (passphrase_info) < 16 &&
361                !strstr (passphrase_info, "OPENPGP")) {
362                /* assume symetric encryption. */
363                int pos=2;
364                c->sym.sym_algo = atoi (passphrase_info);
365                if (c->sym.sym_algo > 9)
366                    pos++;
367                /* XXX: be more strict. */
368                c->sym.s2k_mode = atoi (passphrase_info+pos);
369                c->sym.s2k_hash = atoi (passphrase_info+pos+2);
370            }
371    
372            keyid = parse_gpg_keyid (passphrase_info);
373            pass = agent_get_cache (keyid+8, &item);        
374            if (pass) {
375                agent_unlock_cache_entry (&item);
376                c->pwd_init = 0;
377                if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
378                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
379                if (!WriteFile (hd, "\n", 1, &n, NULL))
380                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
381                return 0;
382            }
383        }
384    
385        if (c->pwd_init) {
386            if (keyid && strlen (keyid) == 16)
387                strcpy (c->keyid, keyid+8);
388    
389            /* if @passphrase_info contains 'OPENPGP' we assume a smart card
390                has been used. */
391            if (strstr (passphrase_info, "OPENPGP")) {
392                const char *s=passphrase_info;
393                while (s && *s && *s != 'D')
394                    s++;
395                _snprintf (c->info, sizeof c->info-1,
396                           _("Please enter the PIN to unlock your secret card key\n"
397                             "Card: %s"), extract_serial_no (s));
398                c->is_card = 1;
399            }
400            else if (uid_hint)
401                parse_gpg_description (uid_hint, passphrase_info,
402                                       c->info, sizeof (c->info) - 1);
403            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
404                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
405                                     (HWND)c->hwnd, passphrase_callback_proc,
406                                     (LPARAM)c);
407            }
408            else if (c->gpg_cmd == GPG_CMD_SIGN) {
409                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
410                                     (HWND)c->hwnd, passphrase_callback_proc,
411                                     (LPARAM)c);
412            }
413            if (rc == -1) {
414                if (!WriteFile (hd, "\n", 1, &n, NULL))
415                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
416                return 0;
417            }
418            c->pwd_init = 0;
419        }
420        if (c->cancel) {
421            if (!WriteFile (hd, "\n", 1, &n, NULL))
422                log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
423            return 0;
424        }
425    
426        if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
427            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
428        if (!WriteFile (hd, "\n", 1, &n, NULL))
429            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
430        return 0;
431    }
432    
433    
434    /* Initialize the given passphrase callback @cb with the
435       used gpgme context @ctx, the command @cmd and a title
436       @title for the dialog. */
437    void
438    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
439                           int cmd, HWND hwnd, const char *title)
440    {
441        memset (cb, 0, sizeof *cb);
442        cb->gpg_cmd = cmd;
443        cb->bad_pwd = 0;
444        cb->is_card = 0;
445        cb->cancel = 0;
446        cb->hwnd = hwnd;
447        cb->pwd_init = 1;
448        free_if_alloc (cb->title);
449        cb->title = m_strdup (title);
450        if (!cb->title)
451            BUG (NULL);
452        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
453        cb->gpg = ctx;
454    }
455    
456    
457    /* Release a passphrase callback @ctx. */
458    void
459    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
460    {
461        gpgme_recipient_t r, n;
462    
463        if (!ctx)
464            return;
465        sfree_if_alloc (ctx->pwd);
466        free_if_alloc (ctx->title);
467        r = ctx->recipients;
468        while (r) {
469            n = r->next;
470            safe_free (r->keyid);
471            safe_free (r);
472            r = n;
473        }
474    }
475    
476    
477    /* Simple check to measure passphrase (@pass) quality.
478       Return value: 0 on success. */
479    int
480    check_passwd_quality (const char *pass, int strict)
481    {
482        int i, nd=0, nc=0, n;
483    
484        n = strlen (pass);
485        if (n < 8)
486            return -1;
487    
488        for (i=0; i < n; i++) {
489            if (isdigit (pass[i]))
490                nd++;
491            if (isalpha (pass[i]))
492                nc++;
493        }
494    
495        /* check that the passphrase contains letters and numbers. */
496        if (nd == n || nc == n)
497            return -1;
498    
499        return 0;
500    }
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