/[winpt]/trunk/Src/wptPassphraseCB.cpp
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revision 23 by twoaday, Fri Sep 30 10:10:16 2005 UTC revision 278 by twoaday, Mon Jan 15 22:02:04 2007 UTC
# Line 1  Line 1 
1  /* wptPassphraseCB.cpp - GPGME Passphrase Callback  /* wptPassphraseCB.cpp - GPGME Passphrase Callback
2   *      Copyright (C) 2001, 2002, 2003, 2005 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  #include <io.h>  
24    #include "resource.h"
25  #include "../resource.h"  #include "wptNLS.h"
26  #include "wptNLS.h"  #include "wptW32API.h"
27  #include "wptW32API.h"  #include "wptVersion.h"
28  #include "wptVersion.h"  #include "wptGPG.h"
29  #include "wptGPG.h"  #include "wptCommonCtl.h"
30  #include "wptCommonCtl.h"  #include "wptContext.h"
31  #include "wptContext.h"  #include "wptDlgs.h"
32  #include "wptDlgs.h"  #include "wptErrors.h"
33  #include "wptUTF8.h"  #include "wptTypes.h"
34  #include "wptErrors.h"  #include "wptKeylist.h"
35  #include "wptTypes.h"  #include "wptAgent.h"
36  #include "wptKeyList.h"  #include "wptRegistry.h"
37  #include "wptAgent.h"  #include "wptUTF8.h"
38  #include "wptRegistry.h"  #include "StringBuffer.h"
39    
40    
41  #define item_ctrl_id( cmd ) \  /* Return the control ID dependent on the mode (sign or decrypt). */
42      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)  #define item_ctrl_id(cmd) \
43        ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
44  #define item_ctrl_id2(cmd) \  
45      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)  #define item_ctrl_id2(cmd) \
46        ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
47    
48  /* Dialog procedure for the passphrase callback. */  const char* get_symkey_algo (int algo);
49  static BOOL CALLBACK  void ListBox_AddString_utf8 (HWND lb, const char *txt);
50  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)  
51  {      
52      static passphrase_cb_s * c;  /* Overwrite passphrase and free memory. */
53      gpgme_key_t key;  static void
54      const char *id;  burn_passphrase (char **pwd)
55      char *info;  {
56      void *ctx = NULL, *item;      char *pass = *pwd;
57      int n;  
58        wipememory (pass, strlen (pass));
59      switch( msg )  {      delete []pass;
60      case WM_INITDIALOG:      *pwd = NULL;
61          c = (passphrase_cb_s *)lparam;  }
62          if (!c)  
63              BUG (0);  
64          SetWindowText (dlg, c->title);  /* Dialog procedure for the passphrase callback. */
65          if (c->gpg_cmd == GPG_CMD_DECRYPT) {  static BOOL CALLBACK
66              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
67                  _("Encrypted with the following public key(s)") );  {    
68              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );      static passphrase_cb_s *c;
69          }      gpgme_decrypt_result_t res=NULL;
70          else if( c->gpg_cmd == GPG_CMD_SIGN )      gpgme_sign_result_t res_sig=NULL;
71              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);      gpgme_recipient_t recip=NULL, r;
72          if (gpgme_op_decrypt_result (c->gpg) != NULL &&      winpt_key_s key;
73              c->gpg_cmd == GPG_CMD_DECRYPT) {      void *item;
74              gpgme_recipient_t r;      int n;
75              gpgme_decrypt_result_t res;  
76        switch (msg) {
77              res = gpgme_op_decrypt_result (c->gpg);      case WM_ACTIVATE:
78              for (r = res->recipients; r; r = r->next) {          safe_edit_control_init (dlg, item_ctrl_id (c->gpg_cmd));
79                  get_pubkey (r->keyid, &key);          break;
80                  if (key) {  
81                      char *uid;      case WM_DESTROY:
82                      id = key->uids->uid;          safe_edit_control_free (dlg, item_ctrl_id (c->gpg_cmd));
83                      if (!id)          break;
84                          id = _("Invalid User ID");  
85                      uid = utf8_to_wincp (id, strlen (id));      case WM_INITDIALOG:
86                      info = new char [8+strlen (uid) + 4 + strlen (r->keyid) + 2];          c = (passphrase_cb_s *)lparam;
87                      if (!info)          if (!c)
88                          BUG (NULL);              BUG (0);
89                      sprintf (info, "%s (%s, 0x%s)", uid,          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
90                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);          SetWindowText (dlg, c->title);
91                      free (uid);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
92                      free (info);              SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
93                  }              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
94                  else {                              _("Encrypted with the following public key(s)"));
95                      info = new char [32 + strlen (r->keyid) + 2];              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
96                      if (!info)          }
97                          BUG (NULL);          else if (c->gpg_cmd == GPG_CMD_SIGN) {
98                      sprintf (info, _("Unknown (key ID 0x%s)"),              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
99                               r->keyid? r->keyid+8 : "????????");              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
100                      free (info);          }
101                  }          /* Because it depends on the order the keys are stored in the
102                  listbox_add_string (GetDlgItem( dlg, IDC_DECRYPT_LIST ), info);             keyring whether res->recipients is complete or not, we also
103              }             support that the recipients were externally extracted and then
104          }             we use this list. */
105          SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?          if (c->recipients)
106                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,              recip = c->recipients; /* recipients were already extracted. */
107                          _("Please enter your passphrase") );          else {
108          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {              res = gpgme_op_decrypt_result (c->gpg);
109              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );              if (res && res->recipients)
110              SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );                  recip = res->recipients;
111          }          }
112          else {          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
113              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );              StringBuffer inf;
114              SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );  
115          }              for (r = recip; r; r = r->next) {
116          center_window( dlg, NULL );                  memset (&key, 0, sizeof (key));
117          SetForegroundWindow( dlg );                  if (!winpt_get_pubkey (r->keyid, &key)) {
118          set_active_window( dlg );                      gpgme_user_id_t u = key.ctx->uids;
119          return FALSE;                      
120                        inf = (u->name? u->name : _("Invalid User ID"));
121          case WM_SYSCOMMAND:                      if (u->email != NULL && strlen (u->email) > 1)
122              if( LOWORD( wparam ) == SC_CLOSE ) {                          inf = inf + " <" + u->email + ">";
123                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );                      inf = inf + " (" + get_key_pubalgo (r->pubkey_algo);
124                  c->cancel = 1;                      inf = inf + ", 0x" + (r->keyid+8) + ")";
125                  EndDialog( dlg, TRUE );                  }
126              }                  else {
127              return FALSE;                      inf = _("Unknown key ID");
128                        inf = inf + " (" + get_key_pubalgo (r->pubkey_algo);
129          case WM_COMMAND:                      inf = inf + ", 0x" + (r->keyid+8) + ")";
130              switch( HIWORD( wparam ) ) {                  }
131              case BN_CLICKED:                  ListBox_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST),
132                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE                                          inf.getBuffer ());
133                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                  winpt_release_pubkey (&key);
134                      HWND hwnd;              }
135                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));          }
136                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
137                      SendMessage( hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0 );              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
138                      SetFocus (hwnd);          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
139                  }                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
140              }                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
141                            _("Please enter your passphrase"));
142              switch (LOWORD (wparam)) {          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
143              case IDOK:                SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
144                  /* fixme: the item is even cached when the passphrase is not              if (res && !res->recipients) {
145                            correct, which means that the user needs to delete all                  StringBuffer sinf;
146                            cached entries to continue. */  
147                  if (c->pwd) {                  sinf = _("Symmetric encryption.");
148                      delete []c->pwd;                  sinf = sinf + "\n" + get_symkey_algo (c->sym.sym_algo);
149                      c->pwd = NULL;                  sinf = sinf + " " + _("encrypted data.");
150                  }                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, sinf.getBuffer ());
151                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));              }
152                  if (!n) {              else
153                      c->pwd = new char[2];                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
154                      strcpy (c->pwd, "");          }
155                  }          else {
156                  else {              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
157                      c->pwd = new char[n+1];              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
158                      if (!c->pwd)          }
159                          BUG (NULL);          center_window (dlg, NULL);
160                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, sizeof (c->pwd) -1);          SetForegroundWindow (dlg);
161                  }          return FALSE;
162                  if (reg_prefs.cache_time > 0 && !c->is_card && !strstr (c->keyid, "missing")) {  
163                      if (agent_get_cache (c->keyid, &item))          case WM_COMMAND:
164                          agent_unlock_cache_entry (&item);              switch (HIWORD (wparam)) {
165                      else              case BN_CLICKED:
166                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
167                  }                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
168                  EndDialog (dlg, TRUE);                      HWND hwnd;
169                  return TRUE;                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
170                                        hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
171              case IDCANCEL:                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
172                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                      SetFocus (hwnd);
173                  c->cancel = 1;                  }
174                  EndDialog (dlg, FALSE);              }
175                  return FALSE;  
176              }              switch (LOWORD (wparam)) {
177              break;              case IDOK:  
178      }                  /* XXX: the item is even cached when the passphrase is not
179                                correct, which means that the user needs to delete all
180      return FALSE;                          cached entries to continue. */
181  }                  if (c->pwd)
182                        burn_passphrase (&c->pwd);
183                    n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
184  /* Extract the main keyid from @pass_info.                  if (!n) {
185     Return value: long main keyid or NULL for an error. */                      c->pwd = new char[2];
186  static const char*                      if (!c->pwd)
187  parse_gpg_keyid (const char *pass_info)                          BUG (NULL);
188  {                      strcpy (c->pwd, "");
189      static char keyid[16+1];                  }
190                        else {
191      if (strlen (pass_info) < 16)                      char *p = new char[n+2];
192          return NULL;                      if (!p)
193      /* the format of the desc buffer looks like this:                          BUG (NULL);
194         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                      /* Get the passphrase and convert it utf8.
195         we use the main keyid to use only one cache entry. */                         This does not just the us-ascii charset. */
196      strncpy (keyid, pass_info+17, 16);                      SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), p, n+1);
197      keyid[16] = 0;                      c->pwd = native_to_utf8 (p);
198      return keyid;                      sfree_if_alloc (p);
199  }                  }
200                    res = gpgme_op_decrypt_result (c->gpg);
201                    if (!res)
202  /* Parse the information in @uid_hint and @pass_info to generate                      res_sig = gpgme_op_sign_result (c->gpg);
203     a input message for the user in @desc. */                  if (!c->is_card && reg_prefs.cache_time > 0 &&
204  static void                      (res || res_sig)) {
205  parse_gpg_description (const char *uid_hint, const char *pass_info,                      if (agent_get_cache (c->keyid, &item))
206                         char *desc, int size)                          agent_unlock_cache_entry (&item);
207  {                      else
208      gpgme_pubkey_algo_t algo;                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
209      char usedkey[16+1], mainkey[16+1];                  }
210      char *uid, *p;                  c->cancel = 0;
211      int n=0;                  EndDialog (dlg, TRUE);
212                    return TRUE;
213      while (p = strsep ((char**)&pass_info, " ")) {                  
214          switch (n++) {              case IDCANCEL:
215          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
216          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;                  c->cancel = 1;
217          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;                  EndDialog (dlg, FALSE);
218          }                  return TRUE;
219      }              }
220      uid_hint += 16; /* skip keyid */              break;
221      uid_hint += 1;  /* space */      }
222        
223      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));      return FALSE;
224    }
225      if (strcmp (usedkey, mainkey))  
226          _snprintf (desc, size-1,  
227                     _("You need a passphrase to unlock the secret key for\n"  /* Extract the main keyid from @pass_info.
228                       "user: \"%s\"\n"     Return value: long main keyid or NULL for an error. */
229                       "%s key, ID %s (main key ID %s)\n"),  static const char*
230                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);  parse_gpg_keyid (const char *pass_info)
231      else if (!strcmp (usedkey, mainkey))  {
232          _snprintf (desc, size-1,      static char keyid[16+1];
233                     _("You need a passphrase to unlock the secret key for\n"      
234                       "user: \"%s\"\n"      /* XXX: check for leading alpha-chars? */
235                       "%s key, ID %s\n"),      if (strlen (pass_info) < 16) {
236                       uid, get_key_pubalgo (algo), usedkey+8);          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
237      free (uid);          return NULL;
238  }      }
239        /* the format of the desc buffer looks like this:
240           request_keyid[16] main_keyid[16] keytype[1] keylength[4]
241  static int inline         we use the main keyid to use only one cache entry. */
242  is_hexstring (const char * p)      strncpy (keyid, pass_info+17, 16);
243  {      keyid[16] = 0;
244      size_t i;      return keyid;
245    }
246      for (i=0; i < strlen (p); i++) {  
247          if (!isxdigit (p[i]))  
248              return -1;  /* Parse the information in @uid_hint and @pass_info to generate
249      }     a input message for the user in @desc. */
250      return 0;  static int
251  }  parse_gpg_description (const char *uid_hint, const char *pass_info,
252                           char *desc, int size)
253    {
254  /* Passphrase callback with the ability to support caching. */      gpgme_pubkey_algo_t algo;
255  gpgme_error_t      char usedkey[16+1];
256  passphrase_cb (void *hook, const char *uid_hint,      char mainkey[16+1];
257                 const char *passphrase_info,      char *p, *uid;
258                 int prev_was_bad, int fd)      int n=0;
259  {  
260      passphrase_cb_s *c = (passphrase_cb_s*)hook;      algo = (gpgme_pubkey_algo_t)0;
261      void *item;      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
262      const char *keyid, *pass;      if (strlen (uid_hint) < 17) {
263      int rc;          *desc = 0;
264            log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
265      if (!c)          return -1;
266          return gpg_error (GPG_ERR_INV_ARG);      }
267    
268      if (passphrase_info) {      while (p = strsep ((char**)&pass_info, " ")) {
269          keyid = parse_gpg_keyid (passphrase_info);          switch (n++) {
270          pass = agent_get_cache (keyid, &item);          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
271          if (pass) {          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
272              agent_unlock_cache_entry (&item);          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
273              c->pwd_init = 0;          }
274              write (fd, pass, strlen (pass));      }
275              write (fd, "\n", 1);      uid_hint += 16; /* skip keyid */
276              return 0;      uid_hint += 1;  /* space */
277          }  
278      }      uid = utf8_to_native (uid_hint);
279        if (strcmp (usedkey, mainkey))
280      if (c->pwd_init) {          _snprintf (desc, size-1,
281          if (keyid && strlen (keyid) == 16)                     _("You need a passphrase to unlock the secret key for user:\n"
282              strcpy (c->keyid, keyid+8);                       "\"%s\"\n"
283                         "%s key, ID 0x%s (main key ID 0x%s)\n"),
284          /* if the desc has a length of 32 and only hex digits, we assume a                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
285             smart card has been used. */      else if (!strcmp (usedkey, mainkey))
286          if (uid_hint && strlen (uid_hint) == 32 && !is_hexstring (uid_hint)) {          _snprintf (desc, size-1,
287              char buf[16];                     _("You need a passphrase to unlock the secret key for user:\n"
288              memset (buf, 0, sizeof buf);                       "\"%s\"\n"
289              strncpy (buf, uid_hint+20, 8);                       "%s key, ID 0x%s\n"),
290              _snprintf (c->info, sizeof c->info-1,                       uid, get_key_pubalgo (algo), usedkey+8);
291                         _("Please enter the PIN to unlock your secret card key\n"      safe_free (uid);
292                           "Card: %s"), buf);      return 0;
293              c->is_card = 1;  }
294          }  
295          else if (uid_hint)  
296              parse_gpg_description (uid_hint, passphrase_info,  /* Extract the serial number from the card ID @id and return it. */
297                                     c->info, sizeof c->info - 1);  const char*
298          if (c->gpg_cmd == GPG_CMD_DECRYPT) {  extract_serial_no (const char *id)
299              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,  {
300                                   (HWND)c->hwnd, passphrase_callback_proc,      static char buf[8];
301                                   (LPARAM)c);      char *p;
302          }  
303          else if (c->gpg_cmd == GPG_CMD_SIGN) {      p = strchr (id, '/');
304              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,      if (!p) {
305                                   (HWND)c->hwnd, passphrase_callback_proc,          log_debug ("extract_serial_no: error '%s'\r\n", id);
306                                   (LPARAM)c);          return "";
307          }      }
308          if (rc == -1) {      memset (buf, 0, sizeof (buf));
309              write (fd, "\n", 1);      strncpy (buf, id+(p-id)-6, 6);
310              return gpg_error (GPG_ERR_EOF);      return buf;
311          }  }
312          c->pwd_init = 0;  
313      }  
314      if (c->cancel) {  /* Passphrase callback with the ability to support caching. */
315          write (fd, "\n", 1);  gpgme_error_t
316          return gpg_error (GPG_ERR_EOF);  passphrase_cb (void *hook, const char *uid_hint,
317      }                 const char *passphrase_info,
318                   int prev_was_bad, int fd)
319      write (fd, c->pwd, strlen (c->pwd));  {
320      write (fd, "\n", 1);      passphrase_cb_s *c = (passphrase_cb_s*)hook;
321      return 0;      HANDLE hd = (HANDLE)fd;
322  }      void *item;
323        const char *keyid=NULL, *pass;
324        DWORD n;
325  /* Initialize the given passphrase callback @cb with the      int rc = 0;
326     used gpgme context @ctx, the command @cmd and a title  
327     @title for the dialog. */      if (!c) {
328  void          log_debug ("passphrase_cb: error no valid callback\r\n");
329  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,          return gpg_error (GPG_ERR_INV_ARG);
330                         int cmd, HWND hwnd, const char *title)      }
331  {      c->bad_pwd = prev_was_bad? 1 : 0;
332      memset (cb, 0, sizeof *cb);      if (prev_was_bad && !c->cancel) {
333      cb->gpg_cmd = cmd;          if (c->pwd)
334      cb->is_card = 0;              burn_passphrase (&c->pwd);
335      cb->cancel = 0;          agent_del_cache (c->keyid);
336      cb->hwnd = hwnd;          c->pwd_init = 1;
337      cb->pwd_init = 1;      }
338      free_if_alloc (cb->title);  
339      cb->title = m_strdup (title);      if (passphrase_info) {
340      if (!cb->title)          if (strlen (passphrase_info) < 16 &&
341          BUG (NULL);              !strstr (passphrase_info, "OPENPGP")) {
342      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);              /* assume symetric encryption. */
343      cb->gpg = ctx;              int pos=2;
344  }              c->sym.sym_algo = atoi (passphrase_info);
345                if (c->sym.sym_algo > 9)
346                    pos++;
347  /* Release a passphrase callback @ctx. */              /* XXX: be more strict. */
348  void              c->sym.s2k_mode = atoi (passphrase_info+pos);
349  release_gpg_passphrase_cb (passphrase_cb_s *ctx)              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
350  {          }
351      if (!ctx)  
352          return;          keyid = parse_gpg_keyid (passphrase_info);
353      sfree_if_alloc (ctx->pwd);          pass = agent_get_cache (keyid+8, &item);        
354      free_if_alloc (ctx->title);          if (pass) {
355  }              agent_unlock_cache_entry (&item);
356                c->pwd_init = 0;
357  /* Simple check to measure passphrase (@pass) quality.              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
358     Return value: 0 on success. */                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
359  int              if (!WriteFile (hd, "\n", 1, &n, NULL))
360  check_passwd_quality (const char *pass, int strict)                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
361  {              return 0;
362      int i, nd=0, nc=0, n;          }
363        }
364      n = strlen (pass);  
365      if (n < 8)      if (c->pwd_init) {
366          return -1;          if (keyid && strlen (keyid) == 16)
367                strcpy (c->keyid, keyid+8);
368      for (i=0; i < n; i++) {  
369          if (isdigit (pass[i])) nd++;          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
370          if (isalpha (pass[i])) nc++;              has been used. */
371      }          if (strstr (passphrase_info, "OPENPGP")) {
372                const char *s=passphrase_info;
373      if (nd == n || nc == n)              while (s && *s && *s != 'D')
374          return -1;                  s++;
375                _snprintf (c->info, sizeof (c->info)-1,
376      return 0;                         _("Please enter the PIN to unlock your secret card key\n"
377  }                           "Card: %s"), extract_serial_no (s));
378                c->is_card = 1;
379            }
380            else if (uid_hint)
381                parse_gpg_description (uid_hint, passphrase_info,
382                                       c->info, sizeof (c->info) - 1);
383            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
384                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
385                                     (HWND)c->hwnd, passphrase_callback_proc,
386                                     (LPARAM)c);
387            }
388            else if (c->gpg_cmd == GPG_CMD_SIGN) {
389                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
390                                     (HWND)c->hwnd, passphrase_callback_proc,
391                                     (LPARAM)c);
392            }
393            if (rc == -1) {
394                if (!WriteFile (hd, "\n", 1, &n, NULL))
395                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
396                log_debug ("passphrase_cb: could not create dialog box\n");
397                return 0;
398            }
399            c->pwd_init = 0;
400        }
401        if (c->cancel || !c->pwd) {
402            if (!WriteFile (hd, "\n", 1, &n, NULL))
403                log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
404            return 0;
405        }
406    
407        if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
408            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
409        if (!WriteFile (hd, "\n", 1, &n, NULL))
410            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
411        return 0;
412    }
413    
414    
415    /* Initialize the given passphrase callback @cb with the
416       used gpgme context @ctx, the command @cmd and a title
417       @title for the dialog. */
418    void
419    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
420                           int cmd, HWND hwnd, const char *title)
421    {
422        memset (cb, 0, sizeof *cb);
423        cb->gpg_cmd = cmd;
424        cb->bad_pwd = 0;
425        cb->is_card = 0;
426        cb->cancel = 0;
427        cb->hwnd = hwnd;
428        cb->pwd_init = 1;
429        free_if_alloc (cb->title);
430        cb->title = m_strdup (title);
431        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
432        cb->gpg = ctx;
433    }
434    
435    
436    /* Release the gpg recipient list. */
437    void
438    release_gpg_recipients (gpgme_recipient_t *recipients)
439    {
440        gpgme_recipient_t r, n;
441    
442        r = *recipients;
443        while (r != NULL) {
444            n = r->next;
445            safe_free (r->keyid);
446            safe_free (r);
447            r = n;
448        }
449        *recipients = NULL;
450    }
451    
452    
453    
454    /* Release a passphrase callback @ctx. */
455    void
456    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
457    {
458        if (!ctx)
459            return;
460        sfree_if_alloc (ctx->pwd);
461        free_if_alloc (ctx->title);
462        release_gpg_recipients (&ctx->recipients);
463    }
464    
465    
466    /* _Simple_ check to measure passphrase (@pass) quality.
467       Return value: 0 on success. */
468    int
469    check_passwd_quality (const char *pass, int strict)
470    {
471        int i, nd=0, nc=0, n;
472    
473        /* A good passphrase should be at least 8 characters. */
474        n = strlen (pass);
475        if (n < 8)
476            return -1;
477    
478        for (i=0; i < n; i++) {
479            if (isdigit (pass[i]))
480                nd++;
481            if (isalpha (pass[i]))
482                nc++;
483        }
484    
485        /* Check that the passphrase contains letters and numbers. */
486        if (nd == n || nc == n)
487            return -1;
488    
489        return 0;
490    }
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