/[winpt]/trunk/Src/wptPassphraseCB.cpp
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revision 23 by twoaday, Fri Sep 30 10:10:16 2005 UTC revision 187 by twoaday, Wed Mar 22 11:04:20 2006 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, 2003, 2005 Timo Schulz
3   *   *      Copyright (C) 2005 g10 Code GmbH
4   * This file is part of WinPT.   *
5   *   * This file is part of WinPT.
6   * WinPT is free software; you can redistribute it and/or   *
7   * modify it under the terms of the GNU General Public License   * WinPT is free software; you can redistribute it and/or
8   * as published by the Free Software Foundation; either version 2   * modify it under the terms of the GNU General Public License
9   * of the License, or (at your option) any later version.   * as published by the Free Software Foundation; either version 2
10   *     * of the License, or (at your option) any later version.
11   * WinPT is distributed in the hope that it will be useful,   *  
12   * but WITHOUT ANY WARRANTY; without even the implied warranty of   * WinPT is distributed in the hope that it will be useful,
13   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * General Public License for more details.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   *   * General Public License for more details.
16   * You should have received a copy of the GNU General Public License   *
17   * along with WinPT; if not, write to the Free Software Foundation,   * You should have received a copy of the GNU General Public License
18   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA   * along with WinPT; if not, write to the Free Software Foundation,
19   */   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20     */
21  #include <windows.h>  
22  #include <ctype.h>  #ifdef HAVE_CONFIG_H
23  #include <io.h>  #include <config.h>
24    #endif
25  #include "../resource.h"  
26  #include "wptNLS.h"  #include <windows.h>
27  #include "wptW32API.h"  #include <ctype.h>
28  #include "wptVersion.h"  
29  #include "wptGPG.h"  #include "resource.h"
30  #include "wptCommonCtl.h"  #include "wptNLS.h"
31  #include "wptContext.h"  #include "wptW32API.h"
32  #include "wptDlgs.h"  #include "wptVersion.h"
33  #include "wptUTF8.h"  #include "wptGPG.h"
34  #include "wptErrors.h"  #include "wptCommonCtl.h"
35  #include "wptTypes.h"  #include "wptContext.h"
36  #include "wptKeyList.h"  #include "wptDlgs.h"
37  #include "wptAgent.h"  #include "wptUTF8.h"
38  #include "wptRegistry.h"  #include "wptErrors.h"
39    #include "wptTypes.h"
40    #include "wptKeylist.h"
41  #define item_ctrl_id( cmd ) \  #include "wptAgent.h"
42      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)  #include "wptRegistry.h"
43    
44  #define item_ctrl_id2(cmd) \  const char* get_symkey_algo (int algo);
45      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)  
46    #define item_ctrl_id(cmd) \
47        ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
48  /* Dialog procedure for the passphrase callback. */  
49  static BOOL CALLBACK  #define item_ctrl_id2(cmd) \
50  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
51  {      
52      static passphrase_cb_s * c;  
53      gpgme_key_t key;  /* Overwrite passphrase and free memory. */
54      const char *id;  static void
55      char *info;  burn_passphrase (char **pwd)
56      void *ctx = NULL, *item;  {
57      int n;      char *pass = *pwd;
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_key_t key;
72          if (gpgme_op_decrypt_result (c->gpg) != NULL &&      gpgme_recipient_t recip=NULL, r;
73              c->gpg_cmd == GPG_CMD_DECRYPT) {      void *item;
74              gpgme_recipient_t r;      const char *id;
75              gpgme_decrypt_result_t res;      char *info;
76        int n;
77              res = gpgme_op_decrypt_result (c->gpg);  
78              for (r = res->recipients; r; r = r->next) {      switch (msg) {
79                  get_pubkey (r->keyid, &key);      case WM_ACTIVATE:
80                  if (key) {          safe_edit_control_init (dlg, item_ctrl_id (c->gpg_cmd));
81                      char *uid;          break;
82                      id = key->uids->uid;  
83                      if (!id)      case WM_DESTROY:
84                          id = _("Invalid User ID");          safe_edit_control_free (dlg, item_ctrl_id (c->gpg_cmd));
85                      uid = utf8_to_wincp (id, strlen (id));          break;
86                      info = new char [8+strlen (uid) + 4 + strlen (r->keyid) + 2];  
87                      if (!info)      case WM_INITDIALOG:
88                          BUG (NULL);          c = (passphrase_cb_s *)lparam;
89                      sprintf (info, "%s (%s, 0x%s)", uid,          if (!c)
90                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);              BUG (0);
91                      free (uid);          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
92                      free (info);          SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
93                  }          SetWindowText (dlg, c->title);
94                  else {          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
95                      info = new char [32 + strlen (r->keyid) + 2];              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
96                      if (!info)                              _("Encrypted with the following public key(s)"));
97                          BUG (NULL);              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
98                      sprintf (info, _("Unknown (key ID 0x%s)"),          }
99                               r->keyid? r->keyid+8 : "????????");          else if (c->gpg_cmd == GPG_CMD_SIGN) {
100                      free (info);              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
101                  }              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
102                  listbox_add_string (GetDlgItem( dlg, IDC_DECRYPT_LIST ), info);          }
103              }          /* Because it depends on the order the keys are stored in the
104          }             keyring whether res->recipients is complete or not, we also
105          SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?             support that the recipients were externally extracted and then
106                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,             we use this list. */
107                          _("Please enter your passphrase") );          if (c->recipients)
108          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {              recip = c->recipients; /* recipients were already extracted. */
109              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );          else {
110              SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );              res = gpgme_op_decrypt_result (c->gpg);
111          }              if (res && res->recipients)
112          else {                  recip = res->recipients;
113              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );          }
114              SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
115          }              for (r = recip; r; r = r->next) {
116          center_window( dlg, NULL );                  get_pubkey (r->keyid, &key);
117          SetForegroundWindow( dlg );                  if (key) {
118          set_active_window( dlg );                      gpgme_user_id_t u = key->uids;
119          return FALSE;                      char *uid;
120    
121          case WM_SYSCOMMAND:                      id = u->name;
122              if( LOWORD( wparam ) == SC_CLOSE ) {                      if (!id)
123                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );                          id = _("Invalid User ID");
124                  c->cancel = 1;                      uid = utf8_to_native (id);
125                  EndDialog( dlg, TRUE );                      n = 32+strlen (uid)+1+4+strlen (r->keyid)+1;
126              }                      if (u->email)
127              return FALSE;                          n += strlen (u->email)+1;
128                        info = new char [n+1];
129          case WM_COMMAND:                      if (!info)
130              switch( HIWORD( wparam ) ) {                          BUG (NULL);
131              case BN_CLICKED:                      if (!u->email || strlen (u->email) < 1)
132                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE                          sprintf (info, "%s (%s, 0x%s)", uid,
133                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
134                      HWND hwnd;                      else
135                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));                          sprintf (info, "%s <%s> (%s, 0x%s)", uid, u->email,
136                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
137                      SendMessage( hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0 );                      free (uid);
138                      SetFocus (hwnd);                  }
139                  }                  else {
140              }                      info = new char [32 + strlen (r->keyid)+1 + 4];
141                        if (!info)
142              switch (LOWORD (wparam)) {                          BUG (NULL);
143              case IDOK:                        sprintf (info, _("Unknown key ID (%s, 0x%s)"),
144                  /* fixme: the item is even cached when the passphrase is not                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
145                            correct, which means that the user needs to delete all                  }
146                            cached entries to continue. */                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
147                  if (c->pwd) {                  free_if_alloc (info);
148                      delete []c->pwd;              }
149                      c->pwd = NULL;          }
150                  }          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
151                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
152                  if (!n) {          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
153                      c->pwd = new char[2];                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
154                      strcpy (c->pwd, "");                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
155                  }                          _("Please enter your passphrase"));
156                  else {          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
157                      c->pwd = new char[n+1];              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
158                      if (!c->pwd)              if (res && !res->recipients) {
159                          BUG (NULL);                  const char *s = _("Symmetric encryption.\n"
160                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, sizeof (c->pwd) -1);                                    "%s encrypted data.");
161                  }                  const char *alg = get_symkey_algo (c->sym.sym_algo);
162                  if (reg_prefs.cache_time > 0 && !c->is_card && !strstr (c->keyid, "missing")) {                  info = new char[strlen (s) + strlen (alg) + 2];
163                      if (agent_get_cache (c->keyid, &item))                  if (!info)
164                          agent_unlock_cache_entry (&item);                      BUG (NULL);
165                      else                  sprintf (info, s, alg);
166                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
167                  }                  free_if_alloc (info);
168                  EndDialog (dlg, TRUE);              }
169                  return TRUE;              else
170                                    SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
171              case IDCANCEL:          }
172                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );          else {
173                  c->cancel = 1;              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
174                  EndDialog (dlg, FALSE);              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
175                  return FALSE;          }
176              }          center_window (dlg, NULL);
177              break;          SetForegroundWindow (dlg);
178      }          return FALSE;
179        
180      return FALSE;          case WM_SYSCOMMAND:
181  }              if (LOWORD (wparam) == SC_CLOSE) {
182                    SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
183                    c->cancel = 1;
184  /* Extract the main keyid from @pass_info.                  EndDialog (dlg, TRUE);
185     Return value: long main keyid or NULL for an error. */              }
186  static const char*              break;
187  parse_gpg_keyid (const char *pass_info)  
188  {          case WM_COMMAND:
189      static char keyid[16+1];              switch (HIWORD (wparam)) {
190                    case BN_CLICKED:
191      if (strlen (pass_info) < 16)                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
192          return NULL;                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
193      /* the format of the desc buffer looks like this:                      HWND hwnd;
194         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
195         we use the main keyid to use only one cache entry. */                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
196      strncpy (keyid, pass_info+17, 16);                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
197      keyid[16] = 0;                      SetFocus (hwnd);
198      return keyid;                  }
199  }              }
200    
201                switch (LOWORD (wparam)) {
202  /* Parse the information in @uid_hint and @pass_info to generate              case IDOK:  
203     a input message for the user in @desc. */                  /* XXX: the item is even cached when the passphrase is not
204  static void                          correct, which means that the user needs to delete all
205  parse_gpg_description (const char *uid_hint, const char *pass_info,                          cached entries to continue. */
206                         char *desc, int size)                  if (c->pwd)
207  {                      burn_passphrase (&c->pwd);
208      gpgme_pubkey_algo_t algo;                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
209      char usedkey[16+1], mainkey[16+1];                  if (!n) {
210      char *uid, *p;                      c->pwd = new char[2];
211      int n=0;                      if (!c->pwd)
212                            BUG (NULL);
213      while (p = strsep ((char**)&pass_info, " ")) {                      strcpy (c->pwd, "");
214          switch (n++) {                  }
215          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;                  else {
216          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;                      c->pwd = new char[n+2];
217          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;                      if (!c->pwd)
218          }                          BUG (NULL);
219      }                      SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd),
220      uid_hint += 16; /* skip keyid */                                          c->pwd, n+1);
221      uid_hint += 1;  /* space */                  }
222                    res = gpgme_op_decrypt_result (c->gpg);
223      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));                  if (!res)
224                        res_sig = gpgme_op_sign_result (c->gpg);            
225      if (strcmp (usedkey, mainkey))                  if (reg_prefs.cache_time > 0 && !c->is_card &&
226          _snprintf (desc, size-1,                      (res || res_sig)) {
227                     _("You need a passphrase to unlock the secret key for\n"                      if (agent_get_cache (c->keyid, &item))                      
228                       "user: \"%s\"\n"                          agent_unlock_cache_entry (&item);
229                       "%s key, ID %s (main key ID %s)\n"),                      else
230                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
231      else if (!strcmp (usedkey, mainkey))                  }
232          _snprintf (desc, size-1,                  c->cancel = 0;
233                     _("You need a passphrase to unlock the secret key for\n"                  EndDialog (dlg, TRUE);
234                       "user: \"%s\"\n"                  return TRUE;
235                       "%s key, ID %s\n"),                  
236                       uid, get_key_pubalgo (algo), usedkey+8);              case IDCANCEL:
237      free (uid);                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
238  }                  c->cancel = 1;
239                    EndDialog (dlg, FALSE);
240                    return FALSE;
241  static int inline              }
242  is_hexstring (const char * p)              break;
243  {      }
244      size_t i;      
245        return FALSE;
246      for (i=0; i < strlen (p); i++) {  }
247          if (!isxdigit (p[i]))  
248              return -1;  
249      }  /* Extract the main keyid from @pass_info.
250      return 0;     Return value: long main keyid or NULL for an error. */
251  }  static const char*
252    parse_gpg_keyid (const char *pass_info)
253    {
254  /* Passphrase callback with the ability to support caching. */      static char keyid[16+1];
255  gpgme_error_t      
256  passphrase_cb (void *hook, const char *uid_hint,      /* XXX: check for leading alpha-chars? */
257                 const char *passphrase_info,      if (strlen (pass_info) < 16) {
258                 int prev_was_bad, int fd)          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
259  {          return NULL;
260      passphrase_cb_s *c = (passphrase_cb_s*)hook;      }
261      void *item;      /* the format of the desc buffer looks like this:
262      const char *keyid, *pass;         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
263      int rc;         we use the main keyid to use only one cache entry. */
264        strncpy (keyid, pass_info+17, 16);
265      if (!c)      keyid[16] = 0;
266          return gpg_error (GPG_ERR_INV_ARG);      return keyid;
267    }
268      if (passphrase_info) {  
269          keyid = parse_gpg_keyid (passphrase_info);  
270          pass = agent_get_cache (keyid, &item);  /* Parse the information in @uid_hint and @pass_info to generate
271          if (pass) {     a input message for the user in @desc. */
272              agent_unlock_cache_entry (&item);  static int
273              c->pwd_init = 0;  parse_gpg_description (const char *uid_hint, const char *pass_info,
274              write (fd, pass, strlen (pass));                         char *desc, int size)
275              write (fd, "\n", 1);  {
276              return 0;      gpgme_pubkey_algo_t algo;
277          }      char usedkey[16+1];
278      }      char mainkey[16+1];
279        char *uid, *p;
280      if (c->pwd_init) {      int n=0;
281          if (keyid && strlen (keyid) == 16)  
282              strcpy (c->keyid, keyid+8);      algo = (gpgme_pubkey_algo_t)0;
283        /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
284          /* if the desc has a length of 32 and only hex digits, we assume a      if (strlen (uid_hint) < 17) {
285             smart card has been used. */          *desc = 0;
286          if (uid_hint && strlen (uid_hint) == 32 && !is_hexstring (uid_hint)) {          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
287              char buf[16];          return -1;
288              memset (buf, 0, sizeof buf);      }
289              strncpy (buf, uid_hint+20, 8);  
290              _snprintf (c->info, sizeof c->info-1,      while (p = strsep ((char**)&pass_info, " ")) {
291                         _("Please enter the PIN to unlock your secret card key\n"          switch (n++) {
292                           "Card: %s"), buf);          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
293              c->is_card = 1;          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
294          }          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
295          else if (uid_hint)          }
296              parse_gpg_description (uid_hint, passphrase_info,      }
297                                     c->info, sizeof c->info - 1);      uid_hint += 16; /* skip keyid */
298          if (c->gpg_cmd == GPG_CMD_DECRYPT) {      uid_hint += 1;  /* space */
299              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,  
300                                   (HWND)c->hwnd, passphrase_callback_proc,      uid = utf8_to_native (uid_hint);
301                                   (LPARAM)c);  
302          }      if (strcmp (usedkey, mainkey))
303          else if (c->gpg_cmd == GPG_CMD_SIGN) {          _snprintf (desc, size-1,
304              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,                     _("You need a passphrase to unlock the secret key for\n"
305                                   (HWND)c->hwnd, passphrase_callback_proc,                       "user: \"%s\"\n"
306                                   (LPARAM)c);                       "%s key, ID %s (main key ID %s)\n"),
307          }                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
308          if (rc == -1) {      else if (!strcmp (usedkey, mainkey))
309              write (fd, "\n", 1);          _snprintf (desc, size-1,
310              return gpg_error (GPG_ERR_EOF);                     _("You need a passphrase to unlock the secret key for\n"
311          }                       "user: \"%s\"\n"
312          c->pwd_init = 0;                       "%s key, ID %s\n"),
313      }                       uid, get_key_pubalgo (algo), usedkey+8);
314      if (c->cancel) {      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 NULL;
330                         int cmd, HWND hwnd, const char *title)      }
331  {      strncpy (buf, id+(p-id)-6, 6);
332      memset (cb, 0, sizeof *cb);      return buf;
333      cb->gpg_cmd = cmd;  }
334      cb->is_card = 0;  
335      cb->cancel = 0;  
336      cb->hwnd = hwnd;  /* Passphrase callback with the ability to support caching. */
337      cb->pwd_init = 1;  gpgme_error_t
338      free_if_alloc (cb->title);  passphrase_cb (void *hook, const char *uid_hint,
339      cb->title = m_strdup (title);                 const char *passphrase_info,
340      if (!cb->title)                 int prev_was_bad, int fd)
341          BUG (NULL);  {
342      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);      passphrase_cb_s *c = (passphrase_cb_s*)hook;
343      cb->gpg = ctx;      HANDLE hd = (HANDLE)fd;
344  }      void *item;
345        const char *keyid=NULL, *pass;
346        DWORD n;
347  /* Release a passphrase callback @ctx. */      int rc = 0;
348  void  
349  release_gpg_passphrase_cb (passphrase_cb_s *ctx)      if (!c) {
350  {          log_debug ("passphrase_cb: error '!c'\r\n");
351      if (!ctx)          return gpg_error (GPG_ERR_INV_ARG);
352          return;      }
353      sfree_if_alloc (ctx->pwd);      c->bad_pwd = prev_was_bad? 1 : 0;
354      free_if_alloc (ctx->title);      if (prev_was_bad && !c->cancel) {
355  }          if (c->pwd)
356                burn_passphrase (&c->pwd);
357  /* Simple check to measure passphrase (@pass) quality.          agent_del_cache (c->keyid);
358     Return value: 0 on success. */          c->pwd_init = 1;
359  int      }
360  check_passwd_quality (const char *pass, int strict)  
361  {      if (passphrase_info) {
362      int i, nd=0, nc=0, n;          if (strlen (passphrase_info) < 16 &&
363                !strstr (passphrase_info, "OPENPGP")) {
364      n = strlen (pass);              /* assume symetric encryption. */
365      if (n < 8)              int pos=2;
366          return -1;              c->sym.sym_algo = atoi (passphrase_info);
367                if (c->sym.sym_algo > 9)
368      for (i=0; i < n; i++) {                  pos++;
369          if (isdigit (pass[i])) nd++;              /* XXX: be more strict. */
370          if (isalpha (pass[i])) nc++;              c->sym.s2k_mode = atoi (passphrase_info+pos);
371      }              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
372            }
373      if (nd == n || nc == n)  
374          return -1;          keyid = parse_gpg_keyid (passphrase_info);
375            pass = agent_get_cache (keyid+8, &item);        
376      return 0;          if (pass) {
377  }              agent_unlock_cache_entry (&item);
378                c->pwd_init = 0;
379                if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
380                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
381                if (!WriteFile (hd, "\n", 1, &n, NULL))
382                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
383                return 0;
384            }
385        }
386    
387        if (c->pwd_init) {
388            if (keyid && strlen (keyid) == 16)
389                strcpy (c->keyid, keyid+8);
390    
391            /* if @passphrase_info contains 'OPENPGP' we assume a smart card
392                has been used. */
393            if (strstr (passphrase_info, "OPENPGP")) {
394                const char *s=passphrase_info;
395                while (s && *s && *s != 'D')
396                    s++;
397                _snprintf (c->info, sizeof c->info-1,
398                           _("Please enter the PIN to unlock your secret card key\n"
399                             "Card: %s"), extract_serial_no (s));
400                c->is_card = 1;
401            }
402            else if (uid_hint)
403                parse_gpg_description (uid_hint, passphrase_info,
404                                       c->info, sizeof (c->info) - 1);
405            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
406                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
407                                     (HWND)c->hwnd, passphrase_callback_proc,
408                                     (LPARAM)c);
409            }
410            else if (c->gpg_cmd == GPG_CMD_SIGN) {
411                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
412                                     (HWND)c->hwnd, passphrase_callback_proc,
413                                     (LPARAM)c);
414            }
415            if (rc == -1) {
416                if (!WriteFile (hd, "\n", 1, &n, NULL))
417                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
418                return 0;
419            }
420            c->pwd_init = 0;
421        }
422        if (c->cancel) {
423            if (!WriteFile (hd, "\n", 1, &n, NULL))
424                log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
425            return 0;
426        }
427    
428        if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
429            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
430        if (!WriteFile (hd, "\n", 1, &n, NULL))
431            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
432        return 0;
433    }
434    
435    
436    /* Initialize the given passphrase callback @cb with the
437       used gpgme context @ctx, the command @cmd and a title
438       @title for the dialog. */
439    void
440    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
441                           int cmd, HWND hwnd, const char *title)
442    {
443        memset (cb, 0, sizeof *cb);
444        cb->gpg_cmd = cmd;
445        cb->bad_pwd = 0;
446        cb->is_card = 0;
447        cb->cancel = 0;
448        cb->hwnd = hwnd;
449        cb->pwd_init = 1;
450        free_if_alloc (cb->title);
451        cb->title = m_strdup (title);
452        if (!cb->title)
453            BUG (NULL);
454        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
455        cb->gpg = ctx;
456    }
457    
458    
459    /* Release a passphrase callback @ctx. */
460    void
461    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
462    {
463        gpgme_recipient_t r, n;
464    
465        if (!ctx)
466            return;
467        sfree_if_alloc (ctx->pwd);
468        free_if_alloc (ctx->title);
469        r = ctx->recipients;
470        while (r) {
471            n = r->next;
472            safe_free (r->keyid);
473            safe_free (r);
474            r = n;
475        }
476    }
477    
478    
479    /* Simple check to measure passphrase (@pass) quality.
480       Return value: 0 on success. */
481    int
482    check_passwd_quality (const char *pass, int strict)
483    {
484        int i, nd=0, nc=0, n;
485    
486        n = strlen (pass);
487        if (n < 8)
488            return -1;
489    
490        for (i=0; i < n; i++) {
491            if (isdigit (pass[i]))
492                nd++;
493            if (isalpha (pass[i]))
494                nc++;
495        }
496    
497        /* check that the passphrase contains letters and numbers. */
498        if (nd == n || nc == n)
499            return -1;
500    
501        return 0;
502    }
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