/[winpt]/trunk/Src/wptPassphraseCB.cpp
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revision 23 by twoaday, Fri Sep 30 10:10:16 2005 UTC revision 255 by twoaday, Tue Aug 1 16:37:23 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, 2002-2006 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,   * 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 "wptErrors.h"
38  #include "wptRegistry.h"  #include "wptTypes.h"
39    #include "wptKeylist.h"
40    #include "wptAgent.h"
41  #define item_ctrl_id( cmd ) \  #include "wptRegistry.h"
42      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)  #include "wptUTF8.h"
43    
44  #define item_ctrl_id2(cmd) \  
45      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)  /* Return the control ID dependent on the mode (sign or decrypt). */
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;  const char* get_symkey_algo (int algo);
53      gpgme_key_t key;  void ListBox_AddString_utf8 (HWND lb, const char *txt);
54      const char *id;  
55      char *info;  
56      void *ctx = NULL, *item;  /* Overwrite passphrase and free memory. */
57      int n;  static void
58    burn_passphrase (char **pwd)
59      switch( msg )  {  {
60      case WM_INITDIALOG:      char *pass = *pwd;
61          c = (passphrase_cb_s *)lparam;      wipememory (pass, strlen (pass));
62          if (!c)      delete []pass;
63              BUG (0);      *pwd = NULL;
64          SetWindowText (dlg, c->title);  }
65          if (c->gpg_cmd == GPG_CMD_DECRYPT) {  
66              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,  
67                  _("Encrypted with the following public key(s)") );  /* Dialog procedure for the passphrase callback. */
68              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );  static BOOL CALLBACK
69          }  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
70          else if( c->gpg_cmd == GPG_CMD_SIGN )  {    
71              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);      static passphrase_cb_s *c;
72          if (gpgme_op_decrypt_result (c->gpg) != NULL &&      gpgme_decrypt_result_t res=NULL;
73              c->gpg_cmd == GPG_CMD_DECRYPT) {      gpgme_sign_result_t res_sig=NULL;
74              gpgme_recipient_t r;      gpgme_recipient_t recip=NULL, r;
75              gpgme_decrypt_result_t res;      winpt_key_s key;
76        void *item;
77              res = gpgme_op_decrypt_result (c->gpg);      const char *id;
78              for (r = res->recipients; r; r = r->next) {      char *info;
79                  get_pubkey (r->keyid, &key);      int n;
80                  if (key) {  
81                      char *uid;      switch (msg) {
82                      id = key->uids->uid;      case WM_ACTIVATE:
83                      if (!id)          safe_edit_control_init (dlg, item_ctrl_id (c->gpg_cmd));
84                          id = _("Invalid User ID");          break;
85                      uid = utf8_to_wincp (id, strlen (id));  
86                      info = new char [8+strlen (uid) + 4 + strlen (r->keyid) + 2];      case WM_DESTROY:
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)
111          }              recip = c->recipients; /* recipients were already extracted. */
112          else {          else {
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 );              for (r = recip; r; r = r->next) {
119          return FALSE;                  memset (&key, 0, sizeof (key));
120                    if (!winpt_get_pubkey (r->keyid, &key)) {
121          case WM_SYSCOMMAND:                      gpgme_user_id_t u = key.ctx->uids;
122              if( LOWORD( wparam ) == SC_CLOSE ) {  
123                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );                      id = u->name;
124                  c->cancel = 1;                      if (!id)
125                  EndDialog( dlg, TRUE );                          id = _("Invalid User ID");
126              }                      n = 32+strlen (id)+1+4+strlen (r->keyid)+1;
127              return FALSE;                      if (u->email)
128                            n += strlen (u->email)+1;
129          case WM_COMMAND:                      info = new char [n+1];
130              switch( HIWORD( wparam ) ) {                      if (!info)
131              case BN_CLICKED:                          BUG (NULL);
132                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE                      if (!u->email || strlen (u->email) < 1)
133                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                          sprintf (info, "%s (%s, 0x%s)", id,
134                      HWND hwnd;                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
135                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));                      else
136                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));                          sprintf (info, "%s <%s> (%s, 0x%s)", id, u->email,
137                      SendMessage( hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0 );                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
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_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
147                  if (c->pwd) {                  free_if_alloc (info);
148                      delete []c->pwd;                  winpt_release_pubkey (&key);
149                      c->pwd = NULL;              }
150                  }          }
151                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
152                  if (!n) {              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
153                      c->pwd = new char[2];          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
154                      strcpy (c->pwd, "");                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
155                  }                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
156                  else {                          _("Please enter your passphrase"));
157                      c->pwd = new char[n+1];          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
158                      if (!c->pwd)              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
159                          BUG (NULL);              if (res && !res->recipients) {
160                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, sizeof (c->pwd) -1);                  const char *s = _("Symmetric encryption.\n"
161                  }                                    "%s encrypted data.");
162                  if (reg_prefs.cache_time > 0 && !c->is_card && !strstr (c->keyid, "missing")) {                  const char *alg = get_symkey_algo (c->sym.sym_algo);
163                      if (agent_get_cache (c->keyid, &item))                  info = new char[strlen (s) + strlen (alg) + 2];
164                          agent_unlock_cache_entry (&item);                  if (!info)
165                      else                      BUG (NULL);
166                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                  sprintf (info, s, alg);
167                  }                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
168                  EndDialog (dlg, TRUE);                  free_if_alloc (info);
169                  return TRUE;              }
170                                else
171              case IDCANCEL:                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
172                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );          }
173                  c->cancel = 1;          else {
174                  EndDialog (dlg, FALSE);              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
175                  return FALSE;              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
176              }          }
177              break;          center_window (dlg, NULL);
178      }          SetForegroundWindow (dlg);
179                return FALSE;
180      return FALSE;  
181  }          case WM_SYSCOMMAND:
182                if (LOWORD (wparam) == SC_CLOSE) {
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;                      char *p = new char[n+2];
217          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;                      if (!p)
218          }                          BUG (NULL);
219      }                      /* Get the passphrase and convert it utf8.
220      uid_hint += 16; /* skip keyid */                         This does not just the us-ascii charset. */
221      uid_hint += 1;  /* space */                      SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), p, n+1);
222                        c->pwd = native_to_utf8 (p);
223      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));                      sfree_if_alloc (p);
224                    }
225      if (strcmp (usedkey, mainkey))                  res = gpgme_op_decrypt_result (c->gpg);
226          _snprintf (desc, size-1,                  if (!res)
227                     _("You need a passphrase to unlock the secret key for\n"                      res_sig = gpgme_op_sign_result (c->gpg);            
228                       "user: \"%s\"\n"                  if (!c->is_card && reg_prefs.cache_time > 0 &&
229                       "%s key, ID %s (main key ID %s)\n"),                      (res || res_sig)) {
230                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);                      if (agent_get_cache (c->keyid, &item))
231      else if (!strcmp (usedkey, mainkey))                          agent_unlock_cache_entry (&item);
232          _snprintf (desc, size-1,                      else
233                     _("You need a passphrase to unlock the secret key for\n"                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
234                       "user: \"%s\"\n"                  }
235                       "%s key, ID %s\n"),                  c->cancel = 0;
236                       uid, get_key_pubalgo (algo), usedkey+8);                  EndDialog (dlg, TRUE);
237      free (uid);                  return TRUE;
238  }                  
239                case IDCANCEL:
240                    SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
241  static int inline                  c->cancel = 1;
242  is_hexstring (const char * p)                  EndDialog (dlg, FALSE);
243  {                  return FALSE;
244      size_t i;              }
245                break;
246      for (i=0; i < strlen (p); i++) {      }
247          if (!isxdigit (p[i]))      
248              return -1;      return FALSE;
249      }  }
250      return 0;  
251  }  
252    /* Extract the main keyid from @pass_info.
253       Return value: long main keyid or NULL for an error. */
254  /* Passphrase callback with the ability to support caching. */  static const char*
255  gpgme_error_t  parse_gpg_keyid (const char *pass_info)
256  passphrase_cb (void *hook, const char *uid_hint,  {
257                 const char *passphrase_info,      static char keyid[16+1];
258                 int prev_was_bad, int fd)      
259  {      /* XXX: check for leading alpha-chars? */
260      passphrase_cb_s *c = (passphrase_cb_s*)hook;      if (strlen (pass_info) < 16) {
261      void *item;          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
262      const char *keyid, *pass;          return NULL;
263      int rc;      }
264        /* the format of the desc buffer looks like this:
265      if (!c)         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
266          return gpg_error (GPG_ERR_INV_ARG);         we use the main keyid to use only one cache entry. */
267        strncpy (keyid, pass_info+17, 16);
268      if (passphrase_info) {      keyid[16] = 0;
269          keyid = parse_gpg_keyid (passphrase_info);      return keyid;
270          pass = agent_get_cache (keyid, &item);  }
271          if (pass) {  
272              agent_unlock_cache_entry (&item);  
273              c->pwd_init = 0;  /* Parse the information in @uid_hint and @pass_info to generate
274              write (fd, pass, strlen (pass));     a input message for the user in @desc. */
275              write (fd, "\n", 1);  static int
276              return 0;  parse_gpg_description (const char *uid_hint, const char *pass_info,
277          }                         char *desc, int size)
278      }  {
279        gpgme_pubkey_algo_t algo;
280      if (c->pwd_init) {      char usedkey[16+1];
281          if (keyid && strlen (keyid) == 16)      char mainkey[16+1];
282              strcpy (c->keyid, keyid+8);      char *p, *uid;
283        int n=0;
284          /* if the desc has a length of 32 and only hex digits, we assume a  
285             smart card has been used. */      algo = (gpgme_pubkey_algo_t)0;
286          if (uid_hint && strlen (uid_hint) == 32 && !is_hexstring (uid_hint)) {      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
287              char buf[16];      if (strlen (uid_hint) < 17) {
288              memset (buf, 0, sizeof buf);          *desc = 0;
289              strncpy (buf, uid_hint+20, 8);          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
290              _snprintf (c->info, sizeof c->info-1,          return -1;
291                         _("Please enter the PIN to unlock your secret card key\n"      }
292                           "Card: %s"), buf);  
293              c->is_card = 1;      while (p = strsep ((char**)&pass_info, " ")) {
294          }          switch (n++) {
295          else if (uid_hint)          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
296              parse_gpg_description (uid_hint, passphrase_info,          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
297                                     c->info, sizeof c->info - 1);          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
298          if (c->gpg_cmd == GPG_CMD_DECRYPT) {          }
299              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,      }
300                                   (HWND)c->hwnd, passphrase_callback_proc,      uid_hint += 16; /* skip keyid */
301                                   (LPARAM)c);      uid_hint += 1;  /* space */
302          }  
303          else if (c->gpg_cmd == GPG_CMD_SIGN) {      uid = utf8_to_native (uid_hint);
304              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,      if (strcmp (usedkey, mainkey))
305                                   (HWND)c->hwnd, passphrase_callback_proc,          _snprintf (desc, size-1,
306                                   (LPARAM)c);                     _("You need a passphrase to unlock the secret key for user:\n"
307          }                       "\"%s\"\n"
308          if (rc == -1) {                       "%s key, ID 0x%s (main key ID 0x%s)\n"),
309              write (fd, "\n", 1);                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
310              return gpg_error (GPG_ERR_EOF);      else if (!strcmp (usedkey, mainkey))
311          }          _snprintf (desc, size-1,
312          c->pwd_init = 0;                     _("You need a passphrase to unlock the secret key for user:\n"
313      }                       "\"%s\"\n"
314      if (c->cancel) {                       "%s key, ID 0x%s\n"),
315          write (fd, "\n", 1);                       uid, get_key_pubalgo (algo), usedkey+8);
316          return gpg_error (GPG_ERR_EOF);      safe_free (uid);
317      }      return 0;
318    }
319      write (fd, c->pwd, strlen (c->pwd));  
320      write (fd, "\n", 1);  
321      return 0;  /* Extract the serial number from the card ID @id and return it. */
322  }  const char*
323    extract_serial_no (const char *id)
324    {
325  /* Initialize the given passphrase callback @cb with the      static char buf[8];
326     used gpgme context @ctx, the command @cmd and a title      char *p;
327     @title for the dialog. */  
328  void      p = strchr (id, '/');
329  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,      if (!p) {
330                         int cmd, HWND hwnd, const char *title)          log_debug ("extract_serial_no: error '%s'\r\n", id);
331  {          return NULL;
332      memset (cb, 0, sizeof *cb);      }
333      cb->gpg_cmd = cmd;      strncpy (buf, id+(p-id)-6, 6);
334      cb->is_card = 0;      return buf;
335      cb->cancel = 0;  }
336      cb->hwnd = hwnd;  
337      cb->pwd_init = 1;  
338      free_if_alloc (cb->title);  /* Passphrase callback with the ability to support caching. */
339      cb->title = m_strdup (title);  gpgme_error_t
340      if (!cb->title)  passphrase_cb (void *hook, const char *uid_hint,
341          BUG (NULL);                 const char *passphrase_info,
342      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);                 int prev_was_bad, int fd)
343      cb->gpg = ctx;  {
344  }      passphrase_cb_s *c = (passphrase_cb_s*)hook;
345        HANDLE hd = (HANDLE)fd;
346        void *item;
347  /* Release a passphrase callback @ctx. */      const char *keyid=NULL, *pass;
348  void      DWORD n;
349  release_gpg_passphrase_cb (passphrase_cb_s *ctx)      int rc = 0;
350  {  
351      if (!ctx)      if (!c) {
352          return;          log_debug ("passphrase_cb: error '!c'\r\n");
353      sfree_if_alloc (ctx->pwd);          return gpg_error (GPG_ERR_INV_ARG);
354      free_if_alloc (ctx->title);      }
355  }      c->bad_pwd = prev_was_bad? 1 : 0;
356        if (prev_was_bad && !c->cancel) {
357  /* Simple check to measure passphrase (@pass) quality.          if (c->pwd)
358     Return value: 0 on success. */              burn_passphrase (&c->pwd);
359  int          agent_del_cache (c->keyid);
360  check_passwd_quality (const char *pass, int strict)          c->pwd_init = 1;
361  {      }
362      int i, nd=0, nc=0, n;  
363        if (passphrase_info) {
364      n = strlen (pass);          if (strlen (passphrase_info) < 16 &&
365      if (n < 8)              !strstr (passphrase_info, "OPENPGP")) {
366          return -1;              /* assume symetric encryption. */
367                int pos=2;
368      for (i=0; i < n; i++) {              c->sym.sym_algo = atoi (passphrase_info);
369          if (isdigit (pass[i])) nd++;              if (c->sym.sym_algo > 9)
370          if (isalpha (pass[i])) nc++;                  pos++;
371      }              /* XXX: be more strict. */
372                c->sym.s2k_mode = atoi (passphrase_info+pos);
373      if (nd == n || nc == n)              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
374          return -1;          }
375    
376      return 0;          keyid = parse_gpg_keyid (passphrase_info);
377  }          pass = agent_get_cache (keyid+8, &item);        
378            if (pass) {
379                agent_unlock_cache_entry (&item);
380                c->pwd_init = 0;
381                if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
382                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
383                if (!WriteFile (hd, "\n", 1, &n, NULL))
384                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
385                return 0;
386            }
387        }
388    
389        if (c->pwd_init) {
390            if (keyid && strlen (keyid) == 16)
391                strcpy (c->keyid, keyid+8);
392    
393            /* if @passphrase_info contains 'OPENPGP' we assume a smart card
394                has been used. */
395            if (strstr (passphrase_info, "OPENPGP")) {
396                const char *s=passphrase_info;
397                while (s && *s && *s != 'D')
398                    s++;
399                _snprintf (c->info, sizeof c->info-1,
400                           _("Please enter the PIN to unlock your secret card key\n"
401                             "Card: %s"), extract_serial_no (s));
402                c->is_card = 1;
403            }
404            else if (uid_hint)
405                parse_gpg_description (uid_hint, passphrase_info,
406                                       c->info, sizeof (c->info) - 1);
407            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
408                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
409                                     (HWND)c->hwnd, passphrase_callback_proc,
410                                     (LPARAM)c);
411            }
412            else if (c->gpg_cmd == GPG_CMD_SIGN) {
413                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
414                                     (HWND)c->hwnd, passphrase_callback_proc,
415                                     (LPARAM)c);
416            }
417            if (rc == -1) {
418                if (!WriteFile (hd, "\n", 1, &n, NULL))
419                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
420                return 0;
421            }
422            c->pwd_init = 0;
423        }
424        if (c->cancel || !c->pwd) {
425            if (!WriteFile (hd, "\n", 1, &n, NULL))
426                log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
427            return 0;
428        }
429    
430        if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
431            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
432        if (!WriteFile (hd, "\n", 1, &n, NULL))
433            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
434        return 0;
435    }
436    
437    
438    /* Initialize the given passphrase callback @cb with the
439       used gpgme context @ctx, the command @cmd and a title
440       @title for the dialog. */
441    void
442    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
443                           int cmd, HWND hwnd, const char *title)
444    {
445        memset (cb, 0, sizeof *cb);
446        cb->gpg_cmd = cmd;
447        cb->bad_pwd = 0;
448        cb->is_card = 0;
449        cb->cancel = 0;
450        cb->hwnd = hwnd;
451        cb->pwd_init = 1;
452        free_if_alloc (cb->title);
453        cb->title = m_strdup (title);
454        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
455        cb->gpg = ctx;
456    }
457    
458    
459    /* Release the gpg recipient list. */
460    void
461    release_gpg_recipients (gpgme_recipient_t *recipients)
462    {
463        gpgme_recipient_t r, n;
464    
465        r = *recipients;
466        while (r != NULL) {
467            n = r->next;
468            safe_free (r->keyid);
469            safe_free (r);
470            r = n;
471        }
472        *recipients = NULL;
473    }
474    
475    
476    
477    /* Release a passphrase callback @ctx. */
478    void
479    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
480    {
481        if (!ctx)
482            return;
483        sfree_if_alloc (ctx->pwd);
484        free_if_alloc (ctx->title);
485        release_gpg_recipients (&ctx->recipients);
486    }
487    
488    
489    /* Simple check to measure passphrase (@pass) quality.
490       Return value: 0 on success. */
491    int
492    check_passwd_quality (const char *pass, int strict)
493    {
494        int i, nd=0, nc=0, n;
495    
496        n = strlen (pass);
497        if (n < 8)
498            return -1;
499    
500        for (i=0; i < n; i++) {
501            if (isdigit (pass[i]))
502                nd++;
503            if (isalpha (pass[i]))
504                nc++;
505        }
506    
507        /* check that the passphrase contains letters and numbers. */
508        if (nd == n || nc == n)
509            return -1;
510    
511        return 0;
512    }
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