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

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revision 23 by twoaday, Fri Sep 30 10:10:16 2005 UTC revision 340 by twoaday, Sun Nov 27 13:15:07 2011 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, 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  #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  
50  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)  
51  {      /* Overwrites the passphrase and free the memory.
52      static passphrase_cb_s * c;     Pointer is also reset to NULL. */
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) {          /* Some people complained that it is no longer possible to
79                  get_pubkey (r->keyid, &key);             paste in the passphrase in this dialog. When this option
80                  if (key) {             is enabled, the ordinary passphrase control will be used. */
81                      char *uid;          if (!reg_prefs.no_safe_pwd_ctrl)
82                      id = key->uids->uid;              safe_edit_control_init (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_DESTROY:
86                      info = new char [8+strlen (uid) + 4 + strlen (r->keyid) + 2];          if (!reg_prefs.no_safe_pwd_ctrl)
87                      if (!info)              safe_edit_control_free (dlg, item_ctrl_id (c->gpg_cmd));
88                          BUG (NULL);          break;
89                      sprintf (info, "%s (%s, 0x%s)", uid,  
90                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);      case WM_INITDIALOG:
91                      free (uid);          c = (passphrase_cb_s *)lparam;
92                      free (info);          if (!c)
93                  }              BUG (0);
94                  else {          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
95                      info = new char [32 + strlen (r->keyid) + 2];          SetWindowText (dlg, c->title);
96                      if (!info)          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
97                          BUG (NULL);              SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
98                      sprintf (info, _("Unknown (key ID 0x%s)"),              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
99                               r->keyid? r->keyid+8 : "????????");                              _("Encrypted with the following public key(s):"));
100                      free (info);              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
101                  }          }
102                  listbox_add_string (GetDlgItem( dlg, IDC_DECRYPT_LIST ), info);          else if (c->gpg_cmd == GPG_CMD_SIGN) {
103              }              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
104          }              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
105          SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?          }
106                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,          /* Because it depends on the order the keys are stored in the
107                          _("Please enter your passphrase") );             keyring, whether res->recipients is complete or not, we also
108          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {             support that the recipients were externally extracted and then
109              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );             we use this list. */
110              SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );          if (c->recipients) /* recipients were already extracted. */
111          }              recip = c->recipients;
112          else {          else if (c->gpg) {
113              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );              res = gpgme_op_decrypt_result (c->gpg);
114              SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );              if (res && res->recipients)
115          }                  recip = res->recipients;
116          center_window( dlg, NULL );          }
117          SetForegroundWindow( dlg );          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
118          set_active_window( dlg );              StringBuffer inf;
119          return FALSE;  
120                for (r = recip; r; r = r->next) {
121          case WM_SYSCOMMAND:                  memset (&key, 0, sizeof (key));
122              if( LOWORD( wparam ) == SC_CLOSE ) {                  if (!winpt_get_pubkey (r->keyid, &key)) {
123                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );                      gpgme_user_id_t u = key.ctx->uids;
124                  c->cancel = 1;                      inf = (u->name? u->name : _("Invalid User ID"));
125                  EndDialog( dlg, TRUE );                      if (u->email != NULL && strlen (u->email) > 1)
126              }                          inf = inf + " <" + u->email + ">";
127              return FALSE;                      inf = inf + " (" + get_key_pubalgo (r->pubkey_algo);
128                        inf = inf + ", 0x" + (r->keyid+8) + ")";
129          case WM_COMMAND:                  }
130              switch( HIWORD( wparam ) ) {                  else {
131              case BN_CLICKED:                      inf = _("Unknown key ID");
132                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE                      inf = inf + " (" + get_key_pubalgo (r->pubkey_algo);
133                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                      inf = inf + ", 0x" + (r->keyid+8) + ")";
134                      HWND hwnd;                  }
135                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));                  ListBox_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST),
136                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));                                          inf.getBuffer ());
137                      SendMessage( hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0 );                  winpt_release_pubkey (&key);
138                      SetFocus (hwnd);              }
139                  }          }
140              }          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
141                EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
142              switch (LOWORD (wparam)) {          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
143              case IDOK:                            IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
144                  /* fixme: the item is even cached when the passphrase is not                          c->bad_pwd? _("Invalid passphrase; Please enter your passphrase again") :
145                            correct, which means that the user needs to delete all                          _("Please enter your passphrase"));
146                            cached entries to continue. */          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
147                  if (c->pwd) {              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
148                      delete []c->pwd;              /* no recipients means symmetric encryption */
149                      c->pwd = NULL;              if (res && !res->recipients) {
150                  }                  StringBuffer sinf;
151                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));  
152                  if (!n) {                  sinf = _("Symmetric encryption.");
153                      c->pwd = new char[2];                  sinf = sinf + "\n" + get_symkey_algo (c->sym.sym_algo);
154                      strcpy (c->pwd, "");                  sinf = sinf + " " + _("encrypted data") + ".";
155                  }                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, sinf.getBuffer ());
156                  else {              }
157                      c->pwd = new char[n+1];              else
158                      if (!c->pwd)                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
159                          BUG (NULL);          }
160                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, sizeof (c->pwd) -1);          else {
161                  }              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
162                  if (reg_prefs.cache_time > 0 && !c->is_card && !strstr (c->keyid, "missing")) {              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
163                      if (agent_get_cache (c->keyid, &item))          }
164                          agent_unlock_cache_entry (&item);          center_window (dlg, NULL);
165                      else          SetForegroundWindow (dlg);
166                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);          return FALSE;
167                  }  
168                  EndDialog (dlg, TRUE);          case WM_COMMAND:
169                  return TRUE;              switch (HIWORD (wparam)) {
170                                case BN_CLICKED:
171              case IDCANCEL:                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE ||
172                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                       LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
173                  c->cancel = 1;                      HWND hwnd;
174                  EndDialog (dlg, FALSE);                      int hide;
175                  return FALSE;                      hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
176              }                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
177              break;                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
178      }                      SetFocus (hwnd);
179                        }
180      return FALSE;              }
181  }  
182                switch (LOWORD (wparam)) {
183                case IDOK:
184  /* Extract the main keyid from @pass_info.                  /* XXX: the item is even cached when the passphrase is not
185     Return value: long main keyid or NULL for an error. */                          correct, which means that the user needs to delete all
186  static const char*                          cached entries to continue. */
187  parse_gpg_keyid (const char *pass_info)                  if (c->pwd)
188  {                      burn_passphrase (&c->pwd);
189      static char keyid[16+1];                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
190                        if (!n) {
191      if (strlen (pass_info) < 16)                      c->pwd = new char[2];
192          return NULL;                      strcpy (c->pwd, "");
193      /* the format of the desc buffer looks like this:                  }
194         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                  else {
195         we use the main keyid to use only one cache entry. */                      char *p = new char[n+2];
196      strncpy (keyid, pass_info+17, 16);                      SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), p, n+1);
197      keyid[16] = 0;                      c->pwd = m_strdup (p);
198      return keyid;                      sfree_if_alloc (p);
199  }                  }
200                    if (c->gpg != NULL) {
201                        res = gpgme_op_decrypt_result (c->gpg);
202  /* Parse the information in @uid_hint and @pass_info to generate                      if (!res)
203     a input message for the user in @desc. */                          res_sig = gpgme_op_sign_result (c->gpg);
204  static void                      if (!c->is_card && reg_prefs.cache_time > 0 &&
205  parse_gpg_description (const char *uid_hint, const char *pass_info,                          (res || res_sig)) {
206                         char *desc, int size)                          if (agent_get_cache (c->keyid, &item))
207  {                              agent_unlock_cache_entry (&item);
208      gpgme_pubkey_algo_t algo;                          else
209      char usedkey[16+1], mainkey[16+1];                              agent_put_cache (c->keyid, c->pwd,
210      char *uid, *p;                                               reg_prefs.cache_time);
211      int n=0;                      }
212                    }
213      while (p = strsep ((char**)&pass_info, " ")) {                  c->cancel = 0;
214          switch (n++) {                  EndDialog (dlg, TRUE);
215          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;                  return TRUE;
216          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;                  
217          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;              case IDCANCEL:
218          }                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
219      }                  c->cancel = 1;
220      uid_hint += 16; /* skip keyid */                  EndDialog (dlg, FALSE);
221      uid_hint += 1;  /* space */                  return TRUE;
222                }
223      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));              break;
224        }
225      if (strcmp (usedkey, mainkey))      
226          _snprintf (desc, size-1,      return FALSE;
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"),  
230                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);  /* Extract the main keyid from @pass_info.
231      else if (!strcmp (usedkey, mainkey))     Return value: long main keyid or NULL for an error. */
232          _snprintf (desc, size-1,  static const char*
233                     _("You need a passphrase to unlock the secret key for\n"  parse_gpg_keyid (const char *pass_info)
234                       "user: \"%s\"\n"  {
235                       "%s key, ID %s\n"),      static char keyid[16+1];
236                       uid, get_key_pubalgo (algo), usedkey+8);      
237      free (uid);      /* XXX: check for leading alpha-chars? */
238  }      if (strlen (pass_info) < 16) {
239            log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
240            return NULL;
241  static int inline      }
242  is_hexstring (const char * p)      /* the format of the desc buffer looks like this:
243  {         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
244      size_t i;         we use the main keyid to use only one cache entry. */
245        strncpy (keyid, pass_info+17, 16);
246      for (i=0; i < strlen (p); i++) {      keyid[16] = 0;
247          if (!isxdigit (p[i]))      return keyid;
248              return -1;  }
249      }  
250      return 0;  
251  }  /* Parse the information in @uid_hint and @pass_info to generate
252       a input message for the user in @desc. */
253    static int
254  /* Passphrase callback with the ability to support caching. */  parse_gpg_description (const char *uid_hint, const char *pass_info,
255  gpgme_error_t                         char *desc, size_t desc_size)
256  passphrase_cb (void *hook, const char *uid_hint,  {
257                 const char *passphrase_info,      gpgme_pubkey_algo_t algo;
258                 int prev_was_bad, int fd)      char usedkey[16+1];
259  {      char mainkey[16+1];
260      passphrase_cb_s *c = (passphrase_cb_s*)hook;      char *p, *uid;
261      void *item;      int n=0;
262      const char *keyid, *pass;  
263      int rc;      algo = (gpgme_pubkey_algo_t)0;
264        /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
265      if (!c)      if (strlen (uid_hint) < 17) {
266          return gpg_error (GPG_ERR_INV_ARG);          *desc = 0;
267            log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
268      if (passphrase_info) {          return -1;
269          keyid = parse_gpg_keyid (passphrase_info);      }
270          pass = agent_get_cache (keyid, &item);  
271          if (pass) {      while ((p = strsep ((char**)&pass_info, " "))) {
272              agent_unlock_cache_entry (&item);          switch (n++) {
273              c->pwd_init = 0;          case 0:
274              write (fd, pass, strlen (pass));              strncpy (mainkey, p, 16);
275              write (fd, "\n", 1);              mainkey[16] = 0;
276              return 0;              break;
277          }  
278      }          case 1:
279                strncpy (usedkey, p, 16);
280      if (c->pwd_init) {              usedkey[16] = 0;
281          if (keyid && strlen (keyid) == 16)              break;
282              strcpy (c->keyid, keyid+8);  
283            case 2:
284          /* if the desc has a length of 32 and only hex digits, we assume a              algo = (gpgme_pubkey_algo_t)atol (p);
285             smart card has been used. */              break;
286          if (uid_hint && strlen (uid_hint) == 32 && !is_hexstring (uid_hint)) {          }
287              char buf[16];      }
288              memset (buf, 0, sizeof buf);      uid_hint += 16; /* skip keyid */
289              strncpy (buf, uid_hint+20, 8);      uid_hint += 1;  /* space */
290              _snprintf (c->info, sizeof c->info-1,  
291                         _("Please enter the PIN to unlock your secret card key\n"      struct winpt_key_s skey;
292                           "Card: %s"), buf);      gpgme_subkey_t sk;
293              c->is_card = 1;      if (winpt_get_seckey (mainkey, &skey))
294          }          BUG (0);
295          else if (uid_hint)      for (sk = skey.ctx->subkeys; sk; sk = sk->next) {
296              parse_gpg_description (uid_hint, passphrase_info,          if (memcmp (sk->keyid, usedkey, 8) == 0)
297                                     c->info, sizeof c->info - 1);              break;
298          if (c->gpg_cmd == GPG_CMD_DECRYPT) {      }
299              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,      uid = utf8_to_native (uid_hint);
300                                   (HWND)c->hwnd, passphrase_callback_proc,      if (strcmp (usedkey, mainkey))
301                                   (LPARAM)c);          _snprintf (desc, desc_size-1,
302          }                     _("You need a passphrase to unlock the secret key for user:\n"
303          else if (c->gpg_cmd == GPG_CMD_SIGN) {                       "\"%s\"\n"
304              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,                       "%d-bit %s key, ID 0x%s, created %s (main key ID 0x%s)\n"),
305                                   (HWND)c->hwnd, passphrase_callback_proc,                     uid, sk->length, get_key_pubalgo (algo),
306                                   (LPARAM)c);                     usedkey+8, get_key_created (sk->timestamp), mainkey+8);
307          }      else if (!strcmp (usedkey, mainkey))
308          if (rc == -1) {          _snprintf (desc, desc_size-1,
309              write (fd, "\n", 1);                     _("You need a passphrase to unlock the secret key for user:\n"
310              return gpg_error (GPG_ERR_EOF);                       "\"%s\"\n"
311          }                       "%d-bit %s key, created %s, ID 0x%s\n"),
312          c->pwd_init = 0;                       uid, sk->length, get_key_pubalgo (algo),
313      }                       get_key_created (sk->timestamp), usedkey+8);
314      if (c->cancel) {      safe_free (uid);
315          write (fd, "\n", 1);      return 0;
316          return gpg_error (GPG_ERR_EOF);  }
317      }  
318    
319      write (fd, c->pwd, strlen (c->pwd));  /* Extract the serial number from the card ID @id and return it. */
320      write (fd, "\n", 1);  const char*
321      return 0;  extract_serial_no (const char *id)
322  }  {
323        static char buf[8];
324        char *p;
325  /* Initialize the given passphrase callback @cb with the  
326     used gpgme context @ctx, the command @cmd and a title      p = strchr (id, '/');
327     @title for the dialog. */      if (!p) {
328  void          log_debug ("extract_serial_no: error '%s'\r\n", id);
329  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,          return "";
330                         int cmd, HWND hwnd, const char *title)      }
331  {      memset (buf, 0, sizeof (buf));
332      memset (cb, 0, sizeof *cb);      strncpy (buf, id+(p-id)-6, 6);
333      cb->gpg_cmd = cmd;      return buf;
334      cb->is_card = 0;  }
335      cb->cancel = 0;  
336      cb->hwnd = hwnd;  
337      cb->pwd_init = 1;  /* Passphrase callback with the ability to support caching. */
338      free_if_alloc (cb->title);  gpgme_error_t
339      cb->title = m_strdup (title);  passphrase_cb (void *hook, const char *uid_hint,
340      if (!cb->title)                 const char *passphrase_info,
341          BUG (NULL);                 int prev_was_bad, int fd)
342      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);  {
343      cb->gpg = ctx;      passphrase_cb_s *c = (passphrase_cb_s*)hook;
344  }      HANDLE hd = (HANDLE)fd;
345        void *item;
346        const char *keyid=NULL, *pass;
347  /* Release a passphrase callback @ctx. */      DWORD n;
348  void  
349  release_gpg_passphrase_cb (passphrase_cb_s *ctx)      if (!c) {
350  {          log_debug ("passphrase_cb: error no valid callback\r\n");
351      if (!ctx)          return gpg_error (GPG_ERR_INV_ARG);
352          return;      }
353      sfree_if_alloc (ctx->pwd);  
354      free_if_alloc (ctx->title);      /* If the last entered passphrase was wrong, we delete a
355  }         possible cached entry, we reset the passphrase buffer
356           and switch to the initial state. */
357  /* Simple check to measure passphrase (@pass) quality.      c->bad_pwd = prev_was_bad? 1 : 0;
358     Return value: 0 on success. */      if (prev_was_bad && !c->cancel) {
359  int          if (c->pwd)
360  check_passwd_quality (const char *pass, int strict)              burn_passphrase (&c->pwd);
361  {          agent_del_cache (c->keyid);
362      int i, nd=0, nc=0, n;          c->pwd_init = 1;
363        }
364      n = strlen (pass);  
365      if (n < 8)      if (passphrase_info) {
366          return -1;          if (strlen (passphrase_info) < 16 &&
367                !strstr (passphrase_info, "OPENPGP")) {
368      for (i=0; i < n; i++) {              /* assume symetric encryption. */
369          if (isdigit (pass[i])) nd++;              int pos=2;
370          if (isalpha (pass[i])) nc++;              c->sym.sym_algo = atoi (passphrase_info);
371      }              if (c->sym.sym_algo > 9)
372                    pos++;
373      if (nd == n || nc == n)              c->sym.s2k_mode = atoi (passphrase_info+pos);
374          return -1;              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
375            }
376      return 0;  
377  }          keyid = parse_gpg_keyid (passphrase_info);
378            pass = agent_get_cache (keyid+8, &item);        
379            if (pass) {
380                agent_unlock_cache_entry (&item);
381                c->pwd_init = 0;
382                if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
383                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
384                if (!WriteFile (hd, "\n", 1, &n, NULL))
385                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
386                return 0;
387            }
388        }
389    
390        if (c->pwd_init) {
391            if (keyid && strlen (keyid) == 16)
392                strcpy (c->keyid, keyid+8);
393    
394            /* if @passphrase_info contains 'OPENPGP' we assume a smart card
395                has been used. */
396            if (strstr (passphrase_info, "OPENPGP")) {
397                const char *s=passphrase_info;
398                while (s && *s && *s != 'D')
399                    s++;
400                _snprintf (c->info, DIM (c->info)-1,
401                           _("Please enter the PIN to unlock your secret card key\n"
402                             "Card: %s"), extract_serial_no (s));
403                c->is_card = 1;
404            }
405            else if (uid_hint)
406                parse_gpg_description (uid_hint, passphrase_info,
407                                       c->info, DIM (c->info) - 1);
408            int rc = 0;
409            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
410                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
411                                     (HWND)c->hwnd, passphrase_callback_proc,
412                                     (LPARAM)c);
413            }
414            else if (c->gpg_cmd == GPG_CMD_SIGN) {
415                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
416                                     (HWND)c->hwnd, passphrase_callback_proc,
417                                     (LPARAM)c);
418            }
419            if (rc == -1) {
420                if (!WriteFile (hd, "\n", 1, &n, NULL))
421                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
422                log_debug ("passphrase_cb: could not create dialog box\n");
423                return 0;
424            }
425            c->pwd_init = 0;
426        }
427        if (c->cancel || !c->pwd) {
428            if (!WriteFile (hd, "\n", 1, &n, NULL))
429                log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
430            return 0;
431        }
432    
433        if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
434            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
435        if (!WriteFile (hd, "\n", 1, &n, NULL))
436            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
437        return 0;
438    }
439    
440    
441    /* Initialize the given passphrase callback @cb with the
442       used gpgme context @ctx, the command @cmd and a title
443       @title for the dialog. */
444    void
445    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
446                           int cmd, HWND hwnd, const char *title)
447    {    
448        memset (cb, 0, sizeof *cb);
449        cb->gpg_cmd = cmd;
450        cb->bad_pwd = 0;
451        cb->is_card = 0;
452        cb->cancel = 0;
453        cb->hwnd = hwnd;
454        cb->pwd_init = 1;
455        cb->title = m_strdup (title);
456        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
457        cb->gpg = ctx;
458    }
459    
460    void
461    set_gpg_auto_passphrase_cb (passphrase_cb_s *cb, const char *title)
462    {
463        memset (cb, 0, sizeof *cb);
464        cb->gpg_cmd = GPG_CMD_SIGN;
465        cb->bad_pwd = 0;
466        cb->is_card = 0;
467        cb->cancel = 0;
468        cb->hwnd = GetActiveWindow ();
469        cb->pwd_init = 1;
470        cb->title = m_strdup (title);
471    }
472    
473    
474    /* Release a passphrase callback @ctx. */
475    void
476    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
477    {
478        if (!ctx)
479            return;
480        sfree_if_alloc (ctx->pwd);
481        free_if_alloc (ctx->title);
482        release_gpg_recipients (&ctx->recipients);
483    }
484    
485    
486    /* Release the gpg recipient list. */
487    void
488    release_gpg_recipients (gpgme_recipient_t *recipients)
489    {
490        gpgme_recipient_t r, n;
491    
492        r = *recipients;
493        while (r != NULL) {
494            n = r->next;
495            safe_free (r->keyid);
496            safe_free (r);
497            r = n;
498        }
499        *recipients = NULL;
500    }
501    
502    
503    /* _Simple_ check to measure passphrase (@pass) quality.
504       Return value: 0 on success. */
505    int
506    check_passwd_quality (const char *pass, int strict)
507    {
508        int i, nd=0, nc=0, n;
509    
510        /* A good passphrase should be at least 8 characters. */
511        n = strlen (pass);
512        if (n < 8)
513            return -1;
514    
515        for (i=0; i < n; i++) {
516            if (isdigit (pass[i]))
517                nd++;
518            if (isalpha (pass[i]))
519                nc++;
520        }
521    
522        /* Check that the passphrase contains letters and numbers. */
523        if (nd == n || nc == n)
524            return -1;
525    
526        return 0;
527    }
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