/[winpt]/trunk/Src/wptPassphraseCB.cpp
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Diff of /trunk/Src/wptPassphraseCB.cpp

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revision 22 by twoaday, Wed Aug 10 11:33:35 2005 UTC revision 333 by twoaday, Tue Oct 13 10:51:21 2009 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, 2002-2006, 2009 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,  #ifdef HAVE_CONFIG_H
18   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA  #include <config.h>
19   */  #endif
20    
21  #include <windows.h>  #include <windows.h>
22  #include <ctype.h>  #include <ctype.h>
23    
24  #include "../resource.h"  #include "resource.h"
25  #include "wptNLS.h"  #include "wptNLS.h"
26  #include "wptW32API.h"  #include "wptW32API.h"
27  #include "wptVersion.h"  #include "wptVersion.h"
28  #include "wptGPG.h"  #include "wptGPG.h"
29  #include "wptCommonCtl.h"  #include "wptCommonCtl.h"
30  #include "wptContext.h"  #include "wptContext.h"
31  #include "wptDlgs.h"  #include "wptDlgs.h"
32  #include "wptUTF8.h"  #include "wptErrors.h"
33  #include "wptErrors.h"  #include "wptTypes.h"
34  #include "wptTypes.h"  #include "wptKeylist.h"
35  #include "wptAgent.h"  #include "wptAgent.h"
36  #include "wptRegistry.h"  #include "wptRegistry.h"
37    #include "wptUTF8.h"
38    #include "StringBuffer.h"
39  #define item_ctrl_id( cmd ) \  
40      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)  
41    /* Return the control ID dependent on the mode (sign or decrypt). */
42  #define item_ctrl_id2(cmd) \  #define item_ctrl_id(cmd) \
43      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
44    
45    #define item_ctrl_id2(cmd) \
46  BOOL CALLBACK      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
47  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)  
48  {      const char* get_symkey_algo (int algo);
49      static passphrase_cb_s * c;  
50      gpgme_key_t key;  
51      const char * s, * id;  /* Overwrites the passphrase and free the memory.
52      char info[768] = {0};     Pointer is also reset to NULL. */
53      void * ctx = NULL, * item;  static void
54      unsigned int pkalgo;  burn_passphrase (char **pwd)
55    {
56      switch( msg )  {      char *pass = *pwd;
57      case WM_INITDIALOG:  
58          c = (passphrase_cb_s *)lparam;      wipememory (pass, strlen (pass));
59          if (!c)      delete []pass;
60              BUG (0);      *pwd = NULL;
61          SetWindowText (dlg, c->title);  }
62          if (c->gpg_cmd == GPG_CMD_DECRYPT) {  
63              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,  
64                  _("Encrypted with the following public key(s)") );  /* Dialog procedure for the passphrase callback. */
65              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );  static BOOL CALLBACK
66          }  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
67          else if( c->gpg_cmd == GPG_CMD_SIGN )  {    
68              CheckDlgButton( dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED );      static passphrase_cb_s *c;
69          if( c->enc_to && c->gpg_cmd == GPG_CMD_DECRYPT ) {      gpgme_decrypt_result_t res=NULL;
70              gpgme_recipients_enum_open( c->enc_to, &ctx );      gpgme_sign_result_t res_sig=NULL;
71              while ( (s = gpgme_recipients_enum_read( c->enc_to, &ctx )) ) {      gpgme_recipient_t recip=NULL, r;
72                  pkalgo = *s; s++;      winpt_key_s key;
73                  get_pubkey( s, &key );      void *item;
74                  if( key ) {      int n;
75                      char * uid = NULL;  
76                      id = gpgme_key_get_string_attr( key, GPGME_ATTR_USERID, NULL, 0 );      switch (msg) {
77                      if( !id )      case WM_ACTIVATE:
78                          id = _("Invalid User ID");          /* Some people complained that it is no longer possible to
79                      uid = utf8_to_wincp (id, strlen (id));                             paste in the passphrase in this dialog. When this option
80                      _snprintf( info, sizeof info - 1, "%s (%s, 0x%s)", uid,             is enabled, the ordinary passphrase control will be used. */
81                                  gpgme_key_expand_attr( GPGME_ATTR_ALGO, pkalgo ), s+8 );          if (!reg_prefs.no_safe_pwd_ctrl)
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" );          if (!reg_prefs.no_safe_pwd_ctrl)
87                  listbox_add_string( GetDlgItem( dlg, IDC_DECRYPT_LIST ), info );              safe_edit_control_free (dlg, item_ctrl_id (c->gpg_cmd));
88              }          break;
89              gpgme_recipients_enum_close( c->enc_to, &ctx );  
90          }      case WM_INITDIALOG:
91          SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?          c = (passphrase_cb_s *)lparam;
92                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,          if (!c)
93                          _("Please enter your passphrase") );              BUG (0);
94          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
95              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );          SetWindowText (dlg, c->title);
96              SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
97          }              SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
98          else {              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
99              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );                              _("Encrypted with the following public key(s):"));
100              SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
101          }          }
102          center_window( dlg );          else if (c->gpg_cmd == GPG_CMD_SIGN) {
103          SetForegroundWindow( dlg );              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
104          set_active_window( dlg );              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
105          return FALSE;          }
106            /* Because it depends on the order the keys are stored in the
107          case WM_SYSCOMMAND:             keyring, whether res->recipients is complete or not, we also
108              if( LOWORD( wparam ) == SC_CLOSE ) {             support that the recipients were externally extracted and then
109                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );             we use this list. */
110                  c->cancel = 1;          if (c->recipients) /* recipients were already extracted. */
111                  EndDialog( dlg, TRUE );              recip = c->recipients;
112              }          else if (c->gpg) {
113              return FALSE;              res = gpgme_op_decrypt_result (c->gpg);
114                if (res && res->recipients)
115          case WM_COMMAND:                  recip = res->recipients;
116              switch( HIWORD( wparam ) ) {          }
117              case BN_CLICKED:          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
118                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE              StringBuffer inf;
119                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {  
120                      HWND hwnd;              for (r = recip; r; r = r->next) {
121                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));                  memset (&key, 0, sizeof (key));
122                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));                  if (!winpt_get_pubkey (r->keyid, &key)) {
123                      SendMessage( hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0 );                      gpgme_user_id_t u = key.ctx->uids;
124                      SetFocus (hwnd);                      inf = (u->name? u->name : _("Invalid User ID"));
125                  }                      if (u->email != NULL && strlen (u->email) > 1)
126              }                          inf = inf + " <" + u->email + ">";
127                        inf = inf + " (" + get_key_pubalgo (r->pubkey_algo);
128              switch (LOWORD (wparam)) {                      inf = inf + ", 0x" + (r->keyid+8) + ")";
129              case IDOK:                    }
130                  /* fixme: the item is even cached when the passphrase is not                  else {
131                            correct, which means that the user needs to delete all                      inf = _("Unknown key ID");
132                            cached entries to continue. */                      inf = inf + " (" + get_key_pubalgo (r->pubkey_algo);
133                  GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, sizeof (c->pwd) -1);                      inf = inf + ", 0x" + (r->keyid+8) + ")";
134                  if (reg_prefs.cache_time > 0 && !c->is_card && !strstr (c->keyid, "missing")) {                  }
135                      if (agent_get_cache (c->keyid, &item))                  ListBox_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST),
136                          agent_unlock_cache_entry (&item);                                          inf.getBuffer ());
137                      else                  winpt_release_pubkey (&key);
138                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);              }
139                  }          }
140                  EndDialog (dlg, TRUE);          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
141                  return TRUE;              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
142                            SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
143              case IDCANCEL:                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
144                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                          c->bad_pwd? _("Invalid passphrase; Please enter your passphrase again") :
145                  c->cancel = 1;                          _("Please enter your passphrase"));
146                  EndDialog (dlg, FALSE);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
147                  return FALSE;              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
148              }              /* no recipients means symmetric encryption */
149              break;              if (res && !res->recipients) {
150      }                  StringBuffer sinf;
151        
152      return FALSE;                  sinf = _("Symmetric encryption.");
153  } /* passphrase_callback_proc */                  sinf = sinf + "\n" + get_symkey_algo (c->sym.sym_algo);
154                    sinf = sinf + " " + _("encrypted data") + ".";
155                    SetDlgItemText (dlg, IDC_DECRYPT_MSG, sinf.getBuffer ());
156  static const char *              }
157  parse_gpg_keyid (const char * desc)              else
158  {                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
159      static char keyid[16+1];          }
160      char * p;          else {
161                    SetFocus (GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
162      p = strrchr (desc, '\n');              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
163      if( !p )          }
164          return NULL;          center_window (dlg, NULL);
165      /* the format of the desc buffer looks like this:          SetForegroundWindow (dlg);
166         request_keyid[16] main_keyid[16] keytype[1] keylength[4]          return FALSE;
167         we use the main keyid to use only one cache entry. */  
168      strncpy (keyid, desc+(p-desc+1+17), 16);          case WM_COMMAND:
169      return keyid;              switch (HIWORD (wparam)) {
170  } /* parse_gpg_keyid */              case BN_CLICKED:
171                    if  (LOWORD (wparam) == IDC_DECRYPT_HIDE ||
172                         LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
173  static void                      HWND hwnd;
174  parse_gpg_description( char * desc, int size )                      int hide;
175  {                      hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
176      char * buffer = NULL, ch, uid[128] = {0}, * uid2 = NULL;                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
177      char usedkey[16+1] = {0}, mainkey[16+1] = {0};                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
178      const char * buf;                      SetFocus (hwnd);
179      int i, algo, try_again = 0;                  }
180                }
181      if( stristr( desc, "[User ID hint missing]" )  
182          || stristr( desc, "[passphrase info missing]" ) ) {              switch (LOWORD (wparam)) {
183          _snprintf( desc, size-1,              case IDOK:
184                     _("You need a passphrase to unlock the secret key for\n"                  /* XXX: the item is even cached when the passphrase is not
185                       "user: [UserID hint missing]\n"                          correct, which means that the user needs to delete all
186                       "      [passphrase info missing]\n") );                          cached entries to continue. */
187          return;                  if (c->pwd)
188      }                      burn_passphrase (&c->pwd);
189                    n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
190      buffer = new char[size+1];                  if (!n) {
191      if( !buffer )                      c->pwd = new char[2];
192          BUG( NULL );                      strcpy (c->pwd, "");
193      strcpy( buffer, desc );                  }
194      buf = buffer;                  else {
195      if( strstr( buf, "TRY_AGAIN" ) ) {                      char *p = new char[n+2];
196          buf += strlen( "TRY_AGAIN\n" );                      SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), p, n+1);
197          try_again = 1;                      if (emulate_utf8_bug)
198      }                          c->pwd = native_to_utf8 (p);
199      else if( strstr( buf, "ENTER_PASSPHRASE" ) )                      else
200          buf += strlen( "ENTER_PASSPHRASE\n" );                          c->pwd = m_strdup (p);
201      else                      sfree_if_alloc (p);
202          BUG( NULL );                  }
203      buf += 17;                  if (c->gpg != NULL) {
204      for( i = 0; i < sizeof uid-1; i++ ) {                      res = gpgme_op_decrypt_result (c->gpg);
205          ch = *buf++;                      if (!res)
206          if( ch == '\n' ) {                          res_sig = gpgme_op_sign_result (c->gpg);
207              uid[i] = '\0';                      if (!c->is_card && reg_prefs.cache_time > 0 &&
208              break;                          (res || res_sig)) {
209          }                          if (agent_get_cache (c->keyid, &item))
210          uid[i] = ch;                              agent_unlock_cache_entry (&item);
211      }                          else
212      memcpy( usedkey, buf, 16 );                              agent_put_cache (c->keyid, c->pwd,
213      usedkey[16] = '\0';                                               reg_prefs.cache_time);
214      buf += 17;                      }
215      memcpy( mainkey, buf, 16 );                  }
216      mainkey[16] = '\0';                  c->cancel = 0;
217      buf += 17;                  EndDialog (dlg, TRUE);
218      if( !buf )                  return TRUE;
219          BUG( NULL );                  
220      algo = atol( buf );              case IDCANCEL:
221      free_if_alloc( buffer );                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
222                    c->cancel = 1;
223      uid2 = utf8_to_wincp (uid, strlen (uid));                  EndDialog (dlg, FALSE);
224                    return TRUE;
225      if( strcmp( usedkey, mainkey ) )              }
226          _snprintf( desc, size-1,              break;
227                     _("You need a passphrase to unlock the secret key for\n"      }
228                       "user: \"%s\"\n"      
229                       "%s key, ID %s (main key ID %s)\n"),      return FALSE;
230                     uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),  }
231                     usedkey+8, mainkey+8 );  
232      else if( !strcmp( usedkey, mainkey ) )  
233          _snprintf( desc, size-1,  /* Extract the main keyid from @pass_info.
234                     _("You need a passphrase to unlock the secret key for\n"     Return value: long main keyid or NULL for an error. */
235                       "user: \"%s\"\n"  static const char*
236                       "%s key, ID %s\n"),  parse_gpg_keyid (const char *pass_info)
237                       uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),  {
238                       usedkey+8 );      static char keyid[16+1];
239      free( uid2 );      
240  } /* parse_gpg_describtion */      /* XXX: check for leading alpha-chars? */
241        if (strlen (pass_info) < 16) {
242            log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
243  static int inline          return NULL;
244  is_hexstring( const char * p )      }
245  {      /* the format of the desc buffer looks like this:
246      size_t i;         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
247      for( i=0; i < strlen( p ); i++ ) {         we use the main keyid to use only one cache entry. */
248          if( !isxdigit( p[i] ) )      strncpy (keyid, pass_info+17, 16);
249              return -1;      keyid[16] = 0;
250      }      return keyid;
251      return 0;  }
252  }  
253    
254    /* Parse the information in @uid_hint and @pass_info to generate
255  const char *     a input message for the user in @desc. */
256  passphrase_cb( void * opaque, const char * desc, void * r_hd )  static int
257  {    parse_gpg_description (const char *uid_hint, const char *pass_info,
258      passphrase_cb_s * c = (passphrase_cb_s *)opaque;                         char *desc, size_t desc_size)
259      void * item;  {
260      const char * pass, * keyid;      gpgme_pubkey_algo_t algo;
261      int rc = 0;      char usedkey[16+1];
262        char mainkey[16+1];
263      if( !c )      char *p, *uid;
264          return NULL;      int n=0;
265    
266      if( desc ) {      algo = (gpgme_pubkey_algo_t)0;
267          keyid = parse_gpg_keyid (desc);      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
268          pass = agent_get_cache( keyid, &item );      if (strlen (uid_hint) < 17) {
269          if( pass ) {          *desc = 0;
270              agent_unlock_cache_entry( &item );          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
271              c->pwd_init = 0;          return -1;
272              return pass;      }
273          }  
274      }      while ((p = strsep ((char**)&pass_info, " "))) {
275            switch (n++) {
276      if( c->pwd_init ) {          case 0:
277          c->keyid = keyid;              strncpy (mainkey, p, 16);
278          /* if the desc has a length of 32 and only hex digits, we assume a              mainkey[16] = 0;
279             smart card has been used. */              break;
280          /*log_box( "", 0, "%s %d %d", desc,strlen( desc), is_hexstring( desc ) );*/  
281          if( desc && strlen( desc ) == 32 && !is_hexstring( desc ) ) {          case 1:
282              char buf[16];              strncpy (usedkey, p, 16);
283              memset( buf, 0, sizeof buf );              usedkey[16] = 0;
284              strncpy( buf, desc+20, 8 );              break;
285              _snprintf( c->info, sizeof c->info-1,  
286                      _("Please enter the PIN to unlock your secret card key\n"          case 2:
287                        "Card: %s"), buf );              algo = (gpgme_pubkey_algo_t)atol (p);
288              c->is_card = 1;              break;
289          }          }
290          else if(desc) {      }
291              strcpy (c->info, desc);      uid_hint += 16; /* skip keyid */
292              parse_gpg_description (c->info, sizeof c->info - 1);      uid_hint += 1;  /* space */
293          }  
294          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {      struct winpt_key_s skey;
295              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,      gpgme_subkey_t sk;
296                                  (HWND)c->hwnd, passphrase_callback_proc,      if (winpt_get_seckey (mainkey, &skey))
297                                  (LPARAM)c );          BUG (0);
298          }      for (sk = skey.ctx->subkeys; sk; sk = sk->next) {
299          else if( c->gpg_cmd == GPG_CMD_SIGN ) {          if (memcmp (sk->keyid, usedkey, 8) == 0)
300              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,              break;
301                                  (HWND)c->hwnd, passphrase_callback_proc,      }
302                                  (LPARAM)c );      uid = utf8_to_native (uid_hint);
303          }      if (strcmp (usedkey, mainkey))
304          if( rc == -1 )          _snprintf (desc, desc_size-1,
305              return NULL;                     _("You need a passphrase to unlock the secret key for user:\n"
306          c->pwd_init = 0;                       "\"%s\"\n"
307      }                       "%d-bit %s key, ID 0x%s, created %s (main key ID 0x%s)\n"),
308                       uid, sk->length, get_key_pubalgo (algo),
309      if( c->cancel )                     usedkey+8, get_key_created (sk->timestamp), mainkey+8);
310          return NULL;      else if (!strcmp (usedkey, mainkey))
311            _snprintf (desc, desc_size-1,
312      return c->pwd;                     _("You need a passphrase to unlock the secret key for user:\n"
313  } /* passphrase_cb */                       "\"%s\"\n"
314                         "%d-bit %s key, created %s, ID 0x%s\n"),
315                         uid, sk->length, get_key_pubalgo (algo),
316  void                       get_key_created (sk->timestamp), usedkey+8);
317  set_gpg_passphrase_cb (gpgme_ctx_t c, passphrase_cb_s *ctx, int cmd,      safe_free (uid);
318                         HWND hwnd, const char *title)      return 0;
319  {  }
320      ctx->gpg_cmd = cmd;  
321      ctx->is_card = 0;  
322      ctx->cancel = 0;  /* Extract the serial number from the card ID @id and return it. */
323      ctx->hwnd = hwnd;  const char*
324      ctx->pwd_init = 1;  extract_serial_no (const char *id)
325      if (strlen (title) > 256)  {
326          BUG (NULL); /* check bounds */      static char buf[8];
327      strcpy (ctx->title, title);      char *p;
328      gpgme_set_passphrase_cb (c, passphrase_cb, ctx);  
329  } /* set_gpg_passphrase_cb */      p = strchr (id, '/');
330        if (!p) {
331            log_debug ("extract_serial_no: error '%s'\r\n", id);
332  int          return "";
333  check_passwd_quality (const char *pass, int strict)      }
334  {      memset (buf, 0, sizeof (buf));
335      int i, nd=0, nc=0, n;      strncpy (buf, id+(p-id)-6, 6);
336        return buf;
337      n = strlen (pass);  }
338      if (n < 8)  
339          return -1;  
340    /* Passphrase callback with the ability to support caching. */
341      for (i=0; i < n; i++) {  gpgme_error_t
342          if (isdigit (pass[i])) nd++;  passphrase_cb (void *hook, const char *uid_hint,
343          if (isalpha (pass[i])) nc++;                 const char *passphrase_info,
344      }                 int prev_was_bad, int fd)
345    {
346      if (nd == n || nc == n)      passphrase_cb_s *c = (passphrase_cb_s*)hook;
347          return -1;      HANDLE hd = (HANDLE)fd;
348        void *item;
349      return 0;      const char *keyid=NULL, *pass;
350  }      DWORD n;
351    
352        if (!c) {
353            log_debug ("passphrase_cb: error no valid callback\r\n");
354            return gpg_error (GPG_ERR_INV_ARG);
355        }
356    
357        /* If the last entered passphrase was wrong, we delete a
358           possible cached entry, we reset the passphrase buffer
359           and switch to the initial state. */
360        c->bad_pwd = prev_was_bad? 1 : 0;
361        if (prev_was_bad && !c->cancel) {
362            if (c->pwd)
363                burn_passphrase (&c->pwd);
364            agent_del_cache (c->keyid);
365            c->pwd_init = 1;
366        }
367    
368        if (passphrase_info) {
369            if (strlen (passphrase_info) < 16 &&
370                !strstr (passphrase_info, "OPENPGP")) {
371                /* assume symetric encryption. */
372                int pos=2;
373                c->sym.sym_algo = atoi (passphrase_info);
374                if (c->sym.sym_algo > 9)
375                    pos++;
376                c->sym.s2k_mode = atoi (passphrase_info+pos);
377                c->sym.s2k_hash = atoi (passphrase_info+pos+2);
378            }
379    
380            keyid = parse_gpg_keyid (passphrase_info);
381            pass = agent_get_cache (keyid+8, &item);        
382            if (pass) {
383                agent_unlock_cache_entry (&item);
384                c->pwd_init = 0;
385                if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
386                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
387                if (!WriteFile (hd, "\n", 1, &n, NULL))
388                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
389                return 0;
390            }
391        }
392    
393        if (c->pwd_init) {
394            if (keyid && strlen (keyid) == 16)
395                strcpy (c->keyid, keyid+8);
396    
397            /* if @passphrase_info contains 'OPENPGP' we assume a smart card
398                has been used. */
399            if (strstr (passphrase_info, "OPENPGP")) {
400                const char *s=passphrase_info;
401                while (s && *s && *s != 'D')
402                    s++;
403                _snprintf (c->info, DIM (c->info)-1,
404                           _("Please enter the PIN to unlock your secret card key\n"
405                             "Card: %s"), extract_serial_no (s));
406                c->is_card = 1;
407            }
408            else if (uid_hint)
409                parse_gpg_description (uid_hint, passphrase_info,
410                                       c->info, DIM (c->info) - 1);
411            int rc = 0;
412            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
413                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
414                                     (HWND)c->hwnd, passphrase_callback_proc,
415                                     (LPARAM)c);
416            }
417            else if (c->gpg_cmd == GPG_CMD_SIGN) {
418                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
419                                     (HWND)c->hwnd, passphrase_callback_proc,
420                                     (LPARAM)c);
421            }
422            if (rc == -1) {
423                if (!WriteFile (hd, "\n", 1, &n, NULL))
424                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
425                log_debug ("passphrase_cb: could not create dialog box\n");
426                return 0;
427            }
428            c->pwd_init = 0;
429        }
430        if (c->cancel || !c->pwd) {
431            if (!WriteFile (hd, "\n", 1, &n, NULL))
432                log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
433            return 0;
434        }
435    
436        if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
437            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
438        if (!WriteFile (hd, "\n", 1, &n, NULL))
439            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
440        return 0;
441    }
442    
443    
444    /* Initialize the given passphrase callback @cb with the
445       used gpgme context @ctx, the command @cmd and a title
446       @title for the dialog. */
447    void
448    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
449                           int cmd, HWND hwnd, const char *title)
450    {    
451        memset (cb, 0, sizeof *cb);
452        cb->gpg_cmd = cmd;
453        cb->bad_pwd = 0;
454        cb->is_card = 0;
455        cb->cancel = 0;
456        cb->hwnd = hwnd;
457        cb->pwd_init = 1;
458        cb->title = m_strdup (title);
459        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
460        cb->gpg = ctx;
461    }
462    
463    void
464    set_gpg_auto_passphrase_cb (passphrase_cb_s *cb, const char *title)
465    {
466        memset (cb, 0, sizeof *cb);
467        cb->gpg_cmd = GPG_CMD_SIGN;
468        cb->bad_pwd = 0;
469        cb->is_card = 0;
470        cb->cancel = 0;
471        cb->hwnd = GetActiveWindow ();
472        cb->pwd_init = 1;
473        cb->title = m_strdup (title);
474    }
475    
476    
477    /* Release a passphrase callback @ctx. */
478    void
479    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
480    {
481        if (!ctx)
482            return;
483        sfree_if_alloc (ctx->pwd);
484        free_if_alloc (ctx->title);
485        release_gpg_recipients (&ctx->recipients);
486    }
487    
488    
489    /* Release the gpg recipient list. */
490    void
491    release_gpg_recipients (gpgme_recipient_t *recipients)
492    {
493        gpgme_recipient_t r, n;
494    
495        r = *recipients;
496        while (r != NULL) {
497            n = r->next;
498            safe_free (r->keyid);
499            safe_free (r);
500            r = n;
501        }
502        *recipients = NULL;
503    }
504    
505    
506    /* _Simple_ check to measure passphrase (@pass) quality.
507       Return value: 0 on success. */
508    int
509    check_passwd_quality (const char *pass, int strict)
510    {
511        int i, nd=0, nc=0, n;
512    
513        /* A good passphrase should be at least 8 characters. */
514        n = strlen (pass);
515        if (n < 8)
516            return -1;
517    
518        for (i=0; i < n; i++) {
519            if (isdigit (pass[i]))
520                nd++;
521            if (isalpha (pass[i]))
522                nc++;
523        }
524    
525        /* Check that the passphrase contains letters and numbers. */
526        if (nd == n || nc == n)
527            return -1;
528    
529        return 0;
530    }
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