/[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 304 by twoaday, Wed Mar 21 10:59:31 2007 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 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;  void ListBox_AddString_utf8 (HWND lb, const char *txt);
50      gpgme_key_t key;  
51      const char * s, * id;  
52      char info[768] = {0};  /* Overwrite passphrase and free memory. */
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)
111                  EndDialog( dlg, TRUE );              recip = c->recipients; /* recipients were already extracted. */
112              }          else {
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);                      
125                  }                      inf = (u->name? u->name : _("Invalid User ID"));
126              }                      if (u->email != NULL && strlen (u->email) > 1)
127                            inf = inf + " <" + u->email + ">";
128              switch (LOWORD (wparam)) {                      inf = inf + " (" + get_key_pubalgo (r->pubkey_algo);
129              case IDOK:                        inf = inf + ", 0x" + (r->keyid+8) + ")";
130                  /* fixme: the item is even cached when the passphrase is not                  }
131                            correct, which means that the user needs to delete all                  else {
132                            cached entries to continue. */                      inf = _("Unknown key ID");
133                  GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, sizeof (c->pwd) -1);                      inf = inf + " (" + get_key_pubalgo (r->pubkey_algo);
134                  if (reg_prefs.cache_time > 0 && !c->is_card && !strstr (c->keyid, "missing")) {                      inf = inf + ", 0x" + (r->keyid+8) + ")";
135                      if (agent_get_cache (c->keyid, &item))                  }
136                          agent_unlock_cache_entry (&item);                  ListBox_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST),
137                      else                                          inf.getBuffer ());
138                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                  winpt_release_pubkey (&key);
139                  }              }
140                  EndDialog (dlg, TRUE);          }
141                  return TRUE;          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
142                                EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
143              case IDCANCEL:          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
144                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
145                  c->cancel = 1;                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
146                  EndDialog (dlg, FALSE);                          _("Please enter your passphrase"));
147                  return FALSE;          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
148              }              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
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 = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
175  {                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
176      char * buffer = NULL, ch, uid[128] = {0}, * uid2 = NULL;                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
177      char usedkey[16+1] = {0}, mainkey[16+1] = {0};                      SetFocus (hwnd);
178      const char * buf;                  }
179      int i, algo, try_again = 0;              }
180    
181      if( stristr( desc, "[User ID hint missing]" )              switch (LOWORD (wparam)) {
182          || stristr( desc, "[passphrase info missing]" ) ) {              case IDOK:  
183          _snprintf( desc, size-1,                  /* XXX: the item is even cached when the passphrase is not
184                     _("You need a passphrase to unlock the secret key for\n"                          correct, which means that the user needs to delete all
185                       "user: [UserID hint missing]\n"                          cached entries to continue. */
186                       "      [passphrase info missing]\n") );                  if (c->pwd)
187          return;                      burn_passphrase (&c->pwd);
188      }                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
189                    if (!n) {
190      buffer = new char[size+1];                      c->pwd = new char[2];
191      if( !buffer )                      if (!c->pwd)
192          BUG( NULL );                          BUG (NULL);
193      strcpy( buffer, desc );                      strcpy (c->pwd, "");
194      buf = buffer;                  }
195      if( strstr( buf, "TRY_AGAIN" ) ) {                  else {
196          buf += strlen( "TRY_AGAIN\n" );                      char *p = new char[n+2];
197          try_again = 1;                      if (!p)
198      }                          BUG (NULL);
199      else if( strstr( buf, "ENTER_PASSPHRASE" ) )                      /* Get the passphrase and convert it utf8.
200          buf += strlen( "ENTER_PASSPHRASE\n" );                         This does not just the us-ascii charset. */
201      else                      SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), p, n+1);
202          BUG( NULL );                      c->pwd = native_to_utf8 (p);
203      buf += 17;                      sfree_if_alloc (p);
204      for( i = 0; i < sizeof uid-1; i++ ) {                  }
205          ch = *buf++;                  res = gpgme_op_decrypt_result (c->gpg);
206          if( ch == '\n' ) {                  if (!res)
207              uid[i] = '\0';                      res_sig = gpgme_op_sign_result (c->gpg);
208              break;                  if (!c->is_card && reg_prefs.cache_time > 0 &&
209          }                      (res || res_sig)) {
210          uid[i] = ch;                      if (agent_get_cache (c->keyid, &item))
211      }                          agent_unlock_cache_entry (&item);
212      memcpy( usedkey, buf, 16 );                      else
213      usedkey[16] = '\0';                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
214      buf += 17;                  }
215      memcpy( mainkey, buf, 16 );                  c->cancel = 0;
216      mainkey[16] = '\0';                  EndDialog (dlg, TRUE);
217      buf += 17;                  return TRUE;
218      if( !buf )                  
219          BUG( NULL );              case IDCANCEL:
220      algo = atol( buf );                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
221      free_if_alloc( buffer );                  c->cancel = 1;
222                    EndDialog (dlg, FALSE);
223      uid2 = utf8_to_wincp (uid, strlen (uid));                  return TRUE;
224                }
225      if( strcmp( usedkey, mainkey ) )              break;
226          _snprintf( desc, size-1,      }
227                     _("You need a passphrase to unlock the secret key for\n"      
228                       "user: \"%s\"\n"      return FALSE;
229                       "%s key, ID %s (main key ID %s)\n"),  }
230                     uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),  
231                     usedkey+8, mainkey+8 );  
232      else if( !strcmp( usedkey, mainkey ) )  /* Extract the main keyid from @pass_info.
233          _snprintf( desc, size-1,     Return value: long main keyid or NULL for an error. */
234                     _("You need a passphrase to unlock the secret key for\n"  static const char*
235                       "user: \"%s\"\n"  parse_gpg_keyid (const char *pass_info)
236                       "%s key, ID %s\n"),  {
237                       uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),      static char keyid[16+1];
238                       usedkey+8 );      
239      free( uid2 );      /* XXX: check for leading alpha-chars? */
240  } /* parse_gpg_describtion */      if (strlen (pass_info) < 16) {
241            log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
242            return NULL;
243  static int inline      }
244  is_hexstring( const char * p )      /* the format of the desc buffer looks like this:
245  {         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
246      size_t i;         we use the main keyid to use only one cache entry. */
247      for( i=0; i < strlen( p ); i++ ) {      strncpy (keyid, pass_info+17, 16);
248          if( !isxdigit( p[i] ) )      keyid[16] = 0;
249              return -1;      return keyid;
250      }  }
251      return 0;  
252  }  
253    /* Parse the information in @uid_hint and @pass_info to generate
254       a input message for the user in @desc. */
255  const char *  static int
256  passphrase_cb( void * opaque, const char * desc, void * r_hd )  parse_gpg_description (const char *uid_hint, const char *pass_info,
257  {                           char *desc, int size)
258      passphrase_cb_s * c = (passphrase_cb_s *)opaque;  {
259      void * item;      gpgme_pubkey_algo_t algo;
260      const char * pass, * keyid;      char usedkey[16+1];
261      int rc = 0;      char mainkey[16+1];
262        char *p, *uid;
263      if( !c )      int n=0;
264          return NULL;  
265        algo = (gpgme_pubkey_algo_t)0;
266      if( desc ) {      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
267          keyid = parse_gpg_keyid (desc);      if (strlen (uid_hint) < 17) {
268          pass = agent_get_cache( keyid, &item );          *desc = 0;
269          if( pass ) {          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
270              agent_unlock_cache_entry( &item );          return -1;
271              c->pwd_init = 0;      }
272              return pass;  
273          }      while (p = strsep ((char**)&pass_info, " ")) {
274      }          switch (n++) {
275            case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
276      if( c->pwd_init ) {          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
277          c->keyid = keyid;          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
278          /* if the desc has a length of 32 and only hex digits, we assume a          }
279             smart card has been used. */      }
280          /*log_box( "", 0, "%s %d %d", desc,strlen( desc), is_hexstring( desc ) );*/      uid_hint += 16; /* skip keyid */
281          if( desc && strlen( desc ) == 32 && !is_hexstring( desc ) ) {      uid_hint += 1;  /* space */
282              char buf[16];  
283              memset( buf, 0, sizeof buf );      uid = utf8_to_native (uid_hint);
284              strncpy( buf, desc+20, 8 );      if (strcmp (usedkey, mainkey))
285              _snprintf( c->info, sizeof c->info-1,          _snprintf (desc, size-1,
286                      _("Please enter the PIN to unlock your secret card key\n"                     _("You need a passphrase to unlock the secret key for user:\n"
287                        "Card: %s"), buf );                       "\"%s\"\n"
288              c->is_card = 1;                       "%s key, ID 0x%s (main key ID 0x%s)\n"),
289          }                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
290          else if(desc) {      else if (!strcmp (usedkey, mainkey))
291              strcpy (c->info, desc);          _snprintf (desc, size-1,
292              parse_gpg_description (c->info, sizeof c->info - 1);                     _("You need a passphrase to unlock the secret key for user:\n"
293          }                       "\"%s\"\n"
294          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {                       "%s key, ID 0x%s\n"),
295              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,                       uid, get_key_pubalgo (algo), usedkey+8);
296                                  (HWND)c->hwnd, passphrase_callback_proc,      safe_free (uid);
297                                  (LPARAM)c );      return 0;
298          }  }
299          else if( c->gpg_cmd == GPG_CMD_SIGN ) {  
300              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,  
301                                  (HWND)c->hwnd, passphrase_callback_proc,  /* Extract the serial number from the card ID @id and return it. */
302                                  (LPARAM)c );  const char*
303          }  extract_serial_no (const char *id)
304          if( rc == -1 )  {
305              return NULL;      static char buf[8];
306          c->pwd_init = 0;      char *p;
307      }  
308        p = strchr (id, '/');
309      if( c->cancel )      if (!p) {
310          return NULL;          log_debug ("extract_serial_no: error '%s'\r\n", id);
311            return "";
312      return c->pwd;      }
313  } /* passphrase_cb */      memset (buf, 0, sizeof (buf));
314        strncpy (buf, id+(p-id)-6, 6);
315        return buf;
316  void  }
317  set_gpg_passphrase_cb (gpgme_ctx_t c, passphrase_cb_s *ctx, int cmd,  
318                         HWND hwnd, const char *title)  
319  {  /* Passphrase callback with the ability to support caching. */
320      ctx->gpg_cmd = cmd;  gpgme_error_t
321      ctx->is_card = 0;  passphrase_cb (void *hook, const char *uid_hint,
322      ctx->cancel = 0;                 const char *passphrase_info,
323      ctx->hwnd = hwnd;                 int prev_was_bad, int fd)
324      ctx->pwd_init = 1;  {
325      if (strlen (title) > 256)      passphrase_cb_s *c = (passphrase_cb_s*)hook;
326          BUG (NULL); /* check bounds */      HANDLE hd = (HANDLE)fd;
327      strcpy (ctx->title, title);      void *item;
328      gpgme_set_passphrase_cb (c, passphrase_cb, ctx);      const char *keyid=NULL, *pass;
329  } /* set_gpg_passphrase_cb */      DWORD n;
330        int rc = 0;
331    
332  int      if (!c) {
333  check_passwd_quality (const char *pass, int strict)          log_debug ("passphrase_cb: error no valid callback\r\n");
334  {          return gpg_error (GPG_ERR_INV_ARG);
335      int i, nd=0, nc=0, n;      }
336        c->bad_pwd = prev_was_bad? 1 : 0;
337      n = strlen (pass);      if (prev_was_bad && !c->cancel) {
338      if (n < 8)          if (c->pwd)
339          return -1;              burn_passphrase (&c->pwd);
340            agent_del_cache (c->keyid);
341      for (i=0; i < n; i++) {          c->pwd_init = 1;
342          if (isdigit (pass[i])) nd++;      }
343          if (isalpha (pass[i])) nc++;  
344      }      if (passphrase_info) {
345            if (strlen (passphrase_info) < 16 &&
346      if (nd == n || nc == n)              !strstr (passphrase_info, "OPENPGP")) {
347          return -1;              /* assume symetric encryption. */
348                int pos=2;
349      return 0;              c->sym.sym_algo = atoi (passphrase_info);
350  }              if (c->sym.sym_algo > 9)
351                    pos++;
352                /* XXX: be more strict. */
353                c->sym.s2k_mode = atoi (passphrase_info+pos);
354                c->sym.s2k_hash = atoi (passphrase_info+pos+2);
355            }
356    
357            keyid = parse_gpg_keyid (passphrase_info);
358            pass = agent_get_cache (keyid+8, &item);        
359            if (pass) {
360                agent_unlock_cache_entry (&item);
361                c->pwd_init = 0;
362                if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
363                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
364                if (!WriteFile (hd, "\n", 1, &n, NULL))
365                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
366                return 0;
367            }
368        }
369    
370        if (c->pwd_init) {
371            if (keyid && strlen (keyid) == 16)
372                strcpy (c->keyid, keyid+8);
373    
374            /* if @passphrase_info contains 'OPENPGP' we assume a smart card
375                has been used. */
376            if (strstr (passphrase_info, "OPENPGP")) {
377                const char *s=passphrase_info;
378                while (s && *s && *s != 'D')
379                    s++;
380                _snprintf (c->info, DIM (c->info)-1,
381                           _("Please enter the PIN to unlock your secret card key\n"
382                             "Card: %s"), extract_serial_no (s));
383                c->is_card = 1;
384            }
385            else if (uid_hint)
386                parse_gpg_description (uid_hint, passphrase_info,
387                                       c->info, sizeof (c->info) - 1);
388            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
389                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
390                                     (HWND)c->hwnd, passphrase_callback_proc,
391                                     (LPARAM)c);
392            }
393            else if (c->gpg_cmd == GPG_CMD_SIGN) {
394                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
395                                     (HWND)c->hwnd, passphrase_callback_proc,
396                                     (LPARAM)c);
397            }
398            if (rc == -1) {
399                if (!WriteFile (hd, "\n", 1, &n, NULL))
400                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
401                log_debug ("passphrase_cb: could not create dialog box\n");
402                return 0;
403            }
404            c->pwd_init = 0;
405        }
406        if (c->cancel || !c->pwd) {
407            if (!WriteFile (hd, "\n", 1, &n, NULL))
408                log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
409            return 0;
410        }
411    
412        if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
413            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
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    
419    
420    /* Initialize the given passphrase callback @cb with the
421       used gpgme context @ctx, the command @cmd and a title
422       @title for the dialog. */
423    void
424    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
425                           int cmd, HWND hwnd, const char *title)
426    {
427        memset (cb, 0, sizeof *cb);
428        cb->gpg_cmd = cmd;
429        cb->bad_pwd = 0;
430        cb->is_card = 0;
431        cb->cancel = 0;
432        cb->hwnd = hwnd;
433        cb->pwd_init = 1;
434        free_if_alloc (cb->title);
435        cb->title = m_strdup (title);
436        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
437        cb->gpg = ctx;
438    }
439    
440    
441    /* Release the gpg recipient list. */
442    void
443    release_gpg_recipients (gpgme_recipient_t *recipients)
444    {
445        gpgme_recipient_t r, n;
446    
447        r = *recipients;
448        while (r != NULL) {
449            n = r->next;
450            safe_free (r->keyid);
451            safe_free (r);
452            r = n;
453        }
454        *recipients = NULL;
455    }
456    
457    
458    
459    /* Release a passphrase callback @ctx. */
460    void
461    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
462    {
463        if (!ctx)
464            return;
465        sfree_if_alloc (ctx->pwd);
466        free_if_alloc (ctx->title);
467        release_gpg_recipients (&ctx->recipients);
468    }
469    
470    
471    /* _Simple_ check to measure passphrase (@pass) quality.
472       Return value: 0 on success. */
473    int
474    check_passwd_quality (const char *pass, int strict)
475    {
476        int i, nd=0, nc=0, n;
477    
478        /* A good passphrase should be at least 8 characters. */
479        n = strlen (pass);
480        if (n < 8)
481            return -1;
482    
483        for (i=0; i < n; i++) {
484            if (isdigit (pass[i]))
485                nd++;
486            if (isalpha (pass[i]))
487                nc++;
488        }
489    
490        /* Check that the passphrase contains letters and numbers. */
491        if (nd == n || nc == n)
492            return -1;
493    
494        return 0;
495    }
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