/[winpt]/trunk/Src/wptPassphraseCB.cpp
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revision 22 by twoaday, Wed Aug 10 11:33:35 2005 UTC revision 214 by twoaday, Sun May 14 18:40:36 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  #define item_ctrl_id2(cmd) \  #include "wptUTF8.h"
43      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)  
44    const char* get_symkey_algo (int algo);
45    
46  BOOL CALLBACK  #define item_ctrl_id(cmd) \
47  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
48  {      
49      static passphrase_cb_s * c;  #define item_ctrl_id2(cmd) \
50      gpgme_key_t key;      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
51      const char * s, * id;  
52      char info[768] = {0};  
53      void * ctx = NULL, * item;  void ListBox_AddString_utf8 (HWND lb, const char *txt);
54      unsigned int pkalgo;  
55    /* Overwrite passphrase and free memory. */
56      switch( msg )  {  static void
57      case WM_INITDIALOG:  burn_passphrase (char **pwd)
58          c = (passphrase_cb_s *)lparam;  {
59          if (!c)      char *pass = *pwd;
60              BUG (0);      wipememory (pass, strlen (pass));
61          SetWindowText (dlg, c->title);      delete []pass;
62          if (c->gpg_cmd == GPG_CMD_DECRYPT) {      *pwd = NULL;
63              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,  }
64                  _("Encrypted with the following public key(s)") );  
65              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );  
66          }  /* Dialog procedure for the passphrase callback. */
67          else if( c->gpg_cmd == GPG_CMD_SIGN )  static BOOL CALLBACK
68              CheckDlgButton( dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED );  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
69          if( c->enc_to && c->gpg_cmd == GPG_CMD_DECRYPT ) {  {    
70              gpgme_recipients_enum_open( c->enc_to, &ctx );      static passphrase_cb_s *c;
71              while ( (s = gpgme_recipients_enum_read( c->enc_to, &ctx )) ) {      gpgme_decrypt_result_t res=NULL;
72                  pkalgo = *s; s++;      gpgme_sign_result_t res_sig=NULL;
73                  get_pubkey( s, &key );      gpgme_key_t key;
74                  if( key ) {      gpgme_recipient_t recip=NULL, r;
75                      char * uid = NULL;      void *item;
76                      id = gpgme_key_get_string_attr( key, GPGME_ATTR_USERID, NULL, 0 );      const char *id;
77                      if( !id )      char *info;
78                          id = _("Invalid User ID");      int n;
79                      uid = utf8_to_wincp (id, strlen (id));                  
80                      _snprintf( info, sizeof info - 1, "%s (%s, 0x%s)", uid,      switch (msg) {
81                                  gpgme_key_expand_attr( GPGME_ATTR_ALGO, pkalgo ), s+8 );      case WM_ACTIVATE:
82                      free( uid );          safe_edit_control_init (dlg, item_ctrl_id (c->gpg_cmd));
83                  }          break;
84                  else  
85                      _snprintf( info, sizeof info - 1, _("Unknown (key ID 0x%s)"),      case WM_DESTROY:
86                                 s? s + 8 : "DEADBEEF" );          safe_edit_control_free (dlg, item_ctrl_id (c->gpg_cmd));
87                  listbox_add_string( GetDlgItem( dlg, IDC_DECRYPT_LIST ), info );          break;
88              }  
89              gpgme_recipients_enum_close( c->enc_to, &ctx );      case WM_INITDIALOG:
90          }          c = (passphrase_cb_s *)lparam;
91          SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?          if (!c)
92                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,              BUG (0);
93                          _("Please enter your passphrase") );          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
94          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {          SetWindowText (dlg, c->title);
95              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
96              SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );              SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
97          }              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
98          else {                              _("Encrypted with the following public key(s)"));
99              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
100              SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );          }
101          }          else if (c->gpg_cmd == GPG_CMD_SIGN) {
102          center_window( dlg );              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
103          SetForegroundWindow( dlg );              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
104          set_active_window( dlg );          }
105          return FALSE;          /* Because it depends on the order the keys are stored in the
106               keyring whether res->recipients is complete or not, we also
107          case WM_SYSCOMMAND:             support that the recipients were externally extracted and then
108              if( LOWORD( wparam ) == SC_CLOSE ) {             we use this list. */
109                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );          if (c->recipients)
110                  c->cancel = 1;              recip = c->recipients; /* recipients were already extracted. */
111                  EndDialog( dlg, TRUE );          else {
112              }              res = gpgme_op_decrypt_result (c->gpg);
113              return FALSE;              if (res && res->recipients)
114                    recip = res->recipients;
115          case WM_COMMAND:          }
116              switch( HIWORD( wparam ) ) {          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
117              case BN_CLICKED:              for (r = recip; r; r = r->next) {
118                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE                  get_pubkey (r->keyid, &key);
119                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                  if (key) {
120                      HWND hwnd;                      gpgme_user_id_t u = key->uids;
121                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));  
122                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));                      id = u->name;
123                      SendMessage( hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0 );                      if (!id)
124                      SetFocus (hwnd);                          id = _("Invalid User ID");
125                  }                      n = 32+strlen (id)+1+4+strlen (r->keyid)+1;
126              }                      if (u->email)
127                            n += strlen (u->email)+1;
128              switch (LOWORD (wparam)) {                      info = new char [n+1];
129              case IDOK:                        if (!info)
130                  /* fixme: the item is even cached when the passphrase is not                          BUG (NULL);
131                            correct, which means that the user needs to delete all                      if (!u->email || strlen (u->email) < 1)
132                            cached entries to continue. */                          sprintf (info, "%s (%s, 0x%s)", id,
133                  GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, sizeof (c->pwd) -1);                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
134                  if (reg_prefs.cache_time > 0 && !c->is_card && !strstr (c->keyid, "missing")) {                      else
135                      if (agent_get_cache (c->keyid, &item))                          sprintf (info, "%s <%s> (%s, 0x%s)", id, u->email,
136                          agent_unlock_cache_entry (&item);                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
137                      else                  }
138                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                  else {
139                  }                      info = new char [32 + strlen (r->keyid)+1 + 4];
140                  EndDialog (dlg, TRUE);                      if (!info)
141                  return TRUE;                          BUG (NULL);
142                                        sprintf (info, _("Unknown key ID (%s, 0x%s)"),
143              case IDCANCEL:                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
144                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                  }
145                  c->cancel = 1;                  ListBox_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
146                  EndDialog (dlg, FALSE);                  free_if_alloc (info);
147                  return FALSE;              }
148              }          }
149              break;          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
150      }              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
151                SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
152      return FALSE;                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
153  } /* passphrase_callback_proc */                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
154                            _("Please enter your passphrase"));
155            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
156  static const char *              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
157  parse_gpg_keyid (const char * desc)              if (res && !res->recipients) {
158  {                  const char *s = _("Symmetric encryption.\n"
159      static char keyid[16+1];                                    "%s encrypted data.");
160      char * p;                  const char *alg = get_symkey_algo (c->sym.sym_algo);
161                        info = new char[strlen (s) + strlen (alg) + 2];
162      p = strrchr (desc, '\n');                  if (!info)
163      if( !p )                      BUG (NULL);
164          return NULL;                  sprintf (info, s, alg);
165      /* the format of the desc buffer looks like this:                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
166         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                  free_if_alloc (info);
167         we use the main keyid to use only one cache entry. */              }
168      strncpy (keyid, desc+(p-desc+1+17), 16);              else
169      return keyid;                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
170  } /* parse_gpg_keyid */          }
171            else {
172                SetFocus (GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
173  static void              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
174  parse_gpg_description( char * desc, int size )          }
175  {          center_window (dlg, NULL);
176      char * buffer = NULL, ch, uid[128] = {0}, * uid2 = NULL;          SetForegroundWindow (dlg);
177      char usedkey[16+1] = {0}, mainkey[16+1] = {0};          return FALSE;
178      const char * buf;  
179      int i, algo, try_again = 0;          case WM_SYSCOMMAND:
180                if (LOWORD (wparam) == SC_CLOSE) {
181      if( stristr( desc, "[User ID hint missing]" )                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
182          || stristr( desc, "[passphrase info missing]" ) ) {                  c->cancel = 1;
183          _snprintf( desc, size-1,                  EndDialog (dlg, TRUE);
184                     _("You need a passphrase to unlock the secret key for\n"              }
185                       "user: [UserID hint missing]\n"              break;
186                       "      [passphrase info missing]\n") );  
187          return;          case WM_COMMAND:
188      }              switch (HIWORD (wparam)) {
189                case BN_CLICKED:
190      buffer = new char[size+1];                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
191      if( !buffer )                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
192          BUG( NULL );                      HWND hwnd;
193      strcpy( buffer, desc );                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
194      buf = buffer;                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
195      if( strstr( buf, "TRY_AGAIN" ) ) {                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
196          buf += strlen( "TRY_AGAIN\n" );                      SetFocus (hwnd);
197          try_again = 1;                  }
198      }              }
199      else if( strstr( buf, "ENTER_PASSPHRASE" ) )  
200          buf += strlen( "ENTER_PASSPHRASE\n" );              switch (LOWORD (wparam)) {
201      else              case IDOK:  
202          BUG( NULL );                  /* XXX: the item is even cached when the passphrase is not
203      buf += 17;                          correct, which means that the user needs to delete all
204      for( i = 0; i < sizeof uid-1; i++ ) {                          cached entries to continue. */
205          ch = *buf++;                  if (c->pwd)
206          if( ch == '\n' ) {                      burn_passphrase (&c->pwd);
207              uid[i] = '\0';                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
208              break;                  if (!n) {
209          }                      c->pwd = new char[2];
210          uid[i] = ch;                      if (!c->pwd)
211      }                          BUG (NULL);
212      memcpy( usedkey, buf, 16 );                      strcpy (c->pwd, "");
213      usedkey[16] = '\0';                  }
214      buf += 17;                  else {
215      memcpy( mainkey, buf, 16 );                      c->pwd = new char[n+2];
216      mainkey[16] = '\0';                      if (!c->pwd)
217      buf += 17;                          BUG (NULL);
218      if( !buf )                      SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd),
219          BUG( NULL );                                          c->pwd, n+1);
220      algo = atol( buf );                  }
221      free_if_alloc( buffer );                  res = gpgme_op_decrypt_result (c->gpg);
222                    if (!res)
223      uid2 = utf8_to_wincp (uid, strlen (uid));                      res_sig = gpgme_op_sign_result (c->gpg);            
224                    if (reg_prefs.cache_time > 0 && !c->is_card &&
225      if( strcmp( usedkey, mainkey ) )                      (res || res_sig)) {
226          _snprintf( desc, size-1,                      if (agent_get_cache (c->keyid, &item))                      
227                     _("You need a passphrase to unlock the secret key for\n"                          agent_unlock_cache_entry (&item);
228                       "user: \"%s\"\n"                      else
229                       "%s key, ID %s (main key ID %s)\n"),                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
230                     uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),                  }
231                     usedkey+8, mainkey+8 );                  c->cancel = 0;
232      else if( !strcmp( usedkey, mainkey ) )                  EndDialog (dlg, TRUE);
233          _snprintf( desc, size-1,                  return TRUE;
234                     _("You need a passphrase to unlock the secret key for\n"                  
235                       "user: \"%s\"\n"              case IDCANCEL:
236                       "%s key, ID %s\n"),                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
237                       uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),                  c->cancel = 1;
238                       usedkey+8 );                  EndDialog (dlg, FALSE);
239      free( uid2 );                  return FALSE;
240  } /* parse_gpg_describtion */              }
241                break;
242        }
243  static int inline      
244  is_hexstring( const char * p )      return FALSE;
245  {  }
246      size_t i;  
247      for( i=0; i < strlen( p ); i++ ) {  
248          if( !isxdigit( p[i] ) )  /* Extract the main keyid from @pass_info.
249              return -1;     Return value: long main keyid or NULL for an error. */
250      }  static const char*
251      return 0;  parse_gpg_keyid (const char *pass_info)
252  }  {
253        static char keyid[16+1];
254        
255  const char *      /* XXX: check for leading alpha-chars? */
256  passphrase_cb( void * opaque, const char * desc, void * r_hd )      if (strlen (pass_info) < 16) {
257  {            log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
258      passphrase_cb_s * c = (passphrase_cb_s *)opaque;          return NULL;
259      void * item;      }
260      const char * pass, * keyid;      /* the format of the desc buffer looks like this:
261      int rc = 0;         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
262           we use the main keyid to use only one cache entry. */
263      if( !c )      strncpy (keyid, pass_info+17, 16);
264          return NULL;      keyid[16] = 0;
265        return keyid;
266      if( desc ) {  }
267          keyid = parse_gpg_keyid (desc);  
268          pass = agent_get_cache( keyid, &item );  
269          if( pass ) {  /* Parse the information in @uid_hint and @pass_info to generate
270              agent_unlock_cache_entry( &item );     a input message for the user in @desc. */
271              c->pwd_init = 0;  static int
272              return pass;  parse_gpg_description (const char *uid_hint, const char *pass_info,
273          }                         char *desc, int size)
274      }  {
275        gpgme_pubkey_algo_t algo;
276      if( c->pwd_init ) {      char usedkey[16+1];
277          c->keyid = keyid;      char mainkey[16+1];
278          /* if the desc has a length of 32 and only hex digits, we assume a      char *p, *uid;
279             smart card has been used. */      int n=0;
280          /*log_box( "", 0, "%s %d %d", desc,strlen( desc), is_hexstring( desc ) );*/  
281          if( desc && strlen( desc ) == 32 && !is_hexstring( desc ) ) {      algo = (gpgme_pubkey_algo_t)0;
282              char buf[16];      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
283              memset( buf, 0, sizeof buf );      if (strlen (uid_hint) < 17) {
284              strncpy( buf, desc+20, 8 );          *desc = 0;
285              _snprintf( c->info, sizeof c->info-1,          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
286                      _("Please enter the PIN to unlock your secret card key\n"          return -1;
287                        "Card: %s"), buf );      }
288              c->is_card = 1;  
289          }      while (p = strsep ((char**)&pass_info, " ")) {
290          else if(desc) {          switch (n++) {
291              strcpy (c->info, desc);          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
292              parse_gpg_description (c->info, sizeof c->info - 1);          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
293          }          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
294          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {          }
295              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,      }
296                                  (HWND)c->hwnd, passphrase_callback_proc,      uid_hint += 16; /* skip keyid */
297                                  (LPARAM)c );      uid_hint += 1;  /* space */
298          }  
299          else if( c->gpg_cmd == GPG_CMD_SIGN ) {      uid = utf8_to_native (uid_hint);
300              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,      if (strcmp (usedkey, mainkey))
301                                  (HWND)c->hwnd, passphrase_callback_proc,          _snprintf (desc, size-1,
302                                  (LPARAM)c );                     _("You need a passphrase to unlock the secret key for\n"
303          }                       "user: \"%s\"\n"
304          if( rc == -1 )                       "%s key, ID %s (main key ID %s)\n"),
305              return NULL;                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
306          c->pwd_init = 0;      else if (!strcmp (usedkey, mainkey))
307      }          _snprintf (desc, size-1,
308                       _("You need a passphrase to unlock the secret key for\n"
309      if( c->cancel )                       "user: \"%s\"\n"
310          return NULL;                       "%s key, ID %s\n"),
311                         uid, get_key_pubalgo (algo), usedkey+8);
312      return c->pwd;      safe_free (uid);
313  } /* passphrase_cb */      return 0;
314    }
315    
316  void  
317  set_gpg_passphrase_cb (gpgme_ctx_t c, passphrase_cb_s *ctx, int cmd,  /* Extract the serial number from the card ID @id and return it. */
318                         HWND hwnd, const char *title)  const char*
319  {  extract_serial_no (const char *id)
320      ctx->gpg_cmd = cmd;  {
321      ctx->is_card = 0;      static char buf[8];
322      ctx->cancel = 0;      char *p;
323      ctx->hwnd = hwnd;  
324      ctx->pwd_init = 1;      p = strchr (id, '/');
325      if (strlen (title) > 256)      if (!p) {
326          BUG (NULL); /* check bounds */          log_debug ("extract_serial_no: error '%s'\r\n", id);
327      strcpy (ctx->title, title);          return NULL;
328      gpgme_set_passphrase_cb (c, passphrase_cb, ctx);      }
329  } /* set_gpg_passphrase_cb */      strncpy (buf, id+(p-id)-6, 6);
330        return buf;
331    }
332  int  
333  check_passwd_quality (const char *pass, int strict)  
334  {  /* Passphrase callback with the ability to support caching. */
335      int i, nd=0, nc=0, n;  gpgme_error_t
336    passphrase_cb (void *hook, const char *uid_hint,
337      n = strlen (pass);                 const char *passphrase_info,
338      if (n < 8)                 int prev_was_bad, int fd)
339          return -1;  {
340        passphrase_cb_s *c = (passphrase_cb_s*)hook;
341      for (i=0; i < n; i++) {      HANDLE hd = (HANDLE)fd;
342          if (isdigit (pass[i])) nd++;      void *item;
343          if (isalpha (pass[i])) nc++;      const char *keyid=NULL, *pass;
344      }      DWORD n;
345        int rc = 0;
346      if (nd == n || nc == n)  
347          return -1;      if (!c) {
348            log_debug ("passphrase_cb: error '!c'\r\n");
349      return 0;          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 || !c->pwd) {
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        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
451        cb->gpg = ctx;
452    }
453    
454    
455    /* Release the gpg recipient list. */
456    void
457    release_gpg_recipients (gpgme_recipient_t *recipients)
458    {
459        gpgme_recipient_t r, n;
460    
461        r = *recipients;
462        while (r != NULL) {
463            n = r->next;
464            safe_free (r->keyid);
465            safe_free (r);
466            r = n;
467        }
468        *recipients = NULL;
469    }
470    
471    
472    
473    /* Release a passphrase callback @ctx. */
474    void
475    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
476    {
477        if (!ctx)
478            return;
479        sfree_if_alloc (ctx->pwd);
480        free_if_alloc (ctx->title);
481        release_gpg_recipients (&ctx->recipients);
482    }
483    
484    
485    /* Simple check to measure passphrase (@pass) quality.
486       Return value: 0 on success. */
487    int
488    check_passwd_quality (const char *pass, int strict)
489    {
490        int i, nd=0, nc=0, n;
491    
492        n = strlen (pass);
493        if (n < 8)
494            return -1;
495    
496        for (i=0; i < n; i++) {
497            if (isdigit (pass[i]))
498                nd++;
499            if (isalpha (pass[i]))
500                nc++;
501        }
502    
503        /* check that the passphrase contains letters and numbers. */
504        if (nd == n || nc == n)
505            return -1;
506    
507        return 0;
508    }
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