/[winpt]/trunk/Src/wptPassphraseCB.cpp
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revision 24 by twoaday, Sat Oct 8 10:43:08 2005 UTC revision 69 by twoaday, Sat Nov 5 12:28:12 2005 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   *      Copyright (C) 2005 g10 Code GmbH
4   *   *
5   * This file is part of WinPT.   * This file is part of WinPT.
6   *   *
7   * WinPT is free software; you can redistribute it and/or   * WinPT is free software; you can redistribute it and/or
8   * modify it under the terms of the GNU General Public License   * modify it under the terms of the GNU General Public License
9   * as published by the Free Software Foundation; either version 2   * as published by the Free Software Foundation; either version 2
10   * of the License, or (at your option) any later version.   * of the License, or (at your option) any later version.
11   *     *  
12   * WinPT is distributed in the hope that it will be useful,   * WinPT is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * General Public License for more details.   * General Public License for more details.
16   *   *
17   * You should have received a copy of the GNU General Public License   * You should have received a copy of the GNU General Public License
18   * along with WinPT; if not, write to the Free Software Foundation,   * along with WinPT; if not, write to the Free Software Foundation,
19   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20   */   */
21    
22  #include <windows.h>  #ifdef HAVE_CONFIG_H
23  #include <ctype.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) \  
45      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)  
46    const char* get_symkey_algo (int algo);
47    
48  /* Dialog procedure for the passphrase callback. */  #define item_ctrl_id( cmd ) \
49  static BOOL CALLBACK      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
50  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)  
51  {      #define item_ctrl_id2(cmd) \
52      static passphrase_cb_s * c;      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
53      gpgme_decrypt_result_t res;  
54      gpgme_sign_result_t res_sig;  
55      gpgme_key_t key;  /* Overwrite passphrase and free memory. */
56      const char *id;  static void
57      char *info;  burn_passphrase (char **pwd)
58      void *ctx = NULL, *item;  {
59      int n;      char *pass = *pwd;
60        wipememory (pass, strlen (pass));
61      switch (msg) {      delete []pass;
62      case WM_INITDIALOG:      *pwd = NULL;
63          c = (passphrase_cb_s *)lparam;  }
64          if (!c)  
65              BUG (0);  
66          SetWindowText (dlg, c->title);  /* Dialog procedure for the passphrase callback. */
67          if (c->gpg_cmd == GPG_CMD_DECRYPT) {  static BOOL CALLBACK
68              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
69                  _("Encrypted with the following public key(s)") );  {    
70              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );      static passphrase_cb_s * c;
71          }      gpgme_decrypt_result_t res = NULL;
72          else if( c->gpg_cmd == GPG_CMD_SIGN )      gpgme_sign_result_t res_sig = NULL;
73              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);      gpgme_key_t key;
74          res = gpgme_op_decrypt_result (c->gpg);      gpgme_recipient_t recip=NULL, r;
75          if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {      void *item;
76              gpgme_recipient_t r;      const char *id;
77        char *info;
78              for (r = res->recipients; r; r = r->next) {      int n;
79                  get_pubkey (r->keyid, &key);  
80                  if (key) {      switch (msg) {
81                      char *uid;      case WM_INITDIALOG:
82                      id = key->uids->name;          c = (passphrase_cb_s *)lparam;
83                      if (!id)          if (!c)
84                          id = _("Invalid User ID");              BUG (0);
85                      uid = utf8_to_wincp (id, strlen (id));          SetWindowText (dlg, c->title);
86                      info = new char [16+strlen (uid) + 4 + strlen (r->keyid) + strlen (key->uids->email) +  3];          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
87                      if (!info)              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
88                          BUG (NULL);                              _("Encrypted with the following public key(s)"));
89                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
90                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);          }
91                      free (uid);          else if (c->gpg_cmd == GPG_CMD_SIGN)
92                                    CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
93                  }          if (c->recipients)
94                  else {              recip = c->recipients; /* recipients were already extracted. */
95                      info = new char [32 + strlen (r->keyid) + 2];          else {
96                      if (!info)              /* XXX: not all ENCRYPT_TO entries are listed here. */
97                          BUG (NULL);              res = gpgme_op_decrypt_result (c->gpg);
98                      sprintf (info, _("Unknown (key ID 0x%s)"),              if (res && res->recipients)
99                               r->keyid? r->keyid+8 : "????????");                  recip = res->recipients;
100                  }          }
101                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
102                  free (info);              for (r = res->recipients; r; r = r->next) {
103              }                  get_pubkey (r->keyid, &key);
104          }                  if (key) {
105          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                      char *uid;
106              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);                      id = key->uids->name;
107          SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?                      if (!id)
108                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                          id = _("Invalid User ID");
109                          _("Please enter your passphrase") );                      uid = utf8_to_wincp (id, strlen (id));
110          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1
111              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));                                       + strlen (key->uids->email)+1];
112              if (res && !res->recipients)                      if (!info)
113                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, _("Symmetric encryption.\n"));                                                                              BUG (NULL);
114              else                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,
115                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
116          }                      free (uid);
117          else {                      
118              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));                  }
119              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);                  else {
120          }                      info = new char [32 + strlen (r->keyid)+1 + 4];
121          center_window (dlg, NULL);                      if (!info)
122          SetForegroundWindow (dlg);                          BUG (NULL);
123          set_active_window (dlg);                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
124          return FALSE;                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
125                    }
126          case WM_SYSCOMMAND:                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
127              if( LOWORD( wparam ) == SC_CLOSE ) {                  free_if_alloc (info);
128                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );              }
129                  c->cancel = 1;          }
130                  EndDialog( dlg, TRUE );          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
131              }              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
132              break;          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
133                            IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
134          case WM_COMMAND:                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
135              switch( HIWORD( wparam ) ) {                          _("Please enter your passphrase"));
136              case BN_CLICKED:          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
137                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
138                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {              if (res && !res->recipients) {
139                      HWND hwnd;                  const char *s = _("Symmetric encryption.\n"
140                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));                                    "%s encrypted data.");
141                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));                  const char *alg = get_symkey_algo (c->sym.sym_algo);
142                      SendMessage( hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0 );                  info = new char[strlen (s) + strlen (alg) + 2];
143                      SetFocus (hwnd);                  if (!info)
144                  }                      BUG (NULL);
145              }                  sprintf (info, s, alg);
146                    SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
147              switch (LOWORD (wparam)) {                  free_if_alloc (info);
148              case IDOK:                }
149                  /* fixme: the item is even cached when the passphrase is not              else
150                            correct, which means that the user needs to delete all                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
151                            cached entries to continue. */          }
152                  if (c->pwd) {          else {
153                      delete []c->pwd;              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
154                      c->pwd = NULL;              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
155                  }          }
156                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));          center_window (dlg, NULL);
157                  if (!n) {          SetForegroundWindow (dlg);
158                      c->pwd = new char[2];          set_active_window (dlg);
159                      strcpy (c->pwd, "");          return FALSE;
160                  }  
161                  else {          case WM_SYSCOMMAND:
162                      c->pwd = new char[n+2];              if (LOWORD (wparam) == SC_CLOSE) {
163                      if (!c->pwd)                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
164                          BUG (NULL);                  c->cancel = 1;
165                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);                  EndDialog (dlg, TRUE);
166                  }              }
167                  res = gpgme_op_decrypt_result (c->gpg);              break;
168                  if (!res)  
169                      res_sig = gpgme_op_sign_result (c->gpg);          case WM_COMMAND:
170                  if (reg_prefs.cache_time > 0 && !c->is_card &&              switch (HIWORD (wparam)) {
171                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {              case BN_CLICKED:
172                      if (agent_get_cache (c->keyid, &item))                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
173                          agent_unlock_cache_entry (&item);                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
174                      else                      HWND hwnd;
175                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
176                  }                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
177                  EndDialog (dlg, TRUE);                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
178                  return TRUE;                      SetFocus (hwnd);
179                                    }
180              case IDCANCEL:              }
181                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );  
182                  c->cancel = 1;              switch (LOWORD (wparam)) {
183                  EndDialog (dlg, FALSE);              case IDOK:  
184                  return FALSE;                  /* XXX: the item is even cached when the passphrase is not
185              }                          correct, which means that the user needs to delete all
186              break;                          cached entries to continue. */
187      }                  if (c->pwd)
188                            burn_passphrase (&c->pwd);
189      return FALSE;                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
190  }                  if (!n) {
191                        c->pwd = new char[2];
192                        if (!c->pwd)
193  /* Extract the main keyid from @pass_info.                          BUG (NULL);
194     Return value: long main keyid or NULL for an error. */                      strcpy (c->pwd, "");
195  static const char*                  }
196  parse_gpg_keyid (const char *pass_info)                  else {
197  {                      c->pwd = new char[n+2];
198      static char keyid[16+1];                      if (!c->pwd)
199                                BUG (NULL);
200      if (strlen (pass_info) < 16)                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
201          return NULL;                  }
202      /* the format of the desc buffer looks like this:                  res = gpgme_op_decrypt_result (c->gpg);
203         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                  if (!res)
204         we use the main keyid to use only one cache entry. */                      res_sig = gpgme_op_sign_result (c->gpg);
205      strncpy (keyid, pass_info+17, 16);                  if (reg_prefs.cache_time > 0 && !c->is_card &&
206      keyid[16] = 0;                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {
207      return keyid;                      if (agent_get_cache (c->keyid, &item))
208  }                          agent_unlock_cache_entry (&item);
209                        else
210                            agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
211  /* Parse the information in @uid_hint and @pass_info to generate                  }
212     a input message for the user in @desc. */                  c->cancel = 0;
213  static void                  EndDialog (dlg, TRUE);
214  parse_gpg_description (const char *uid_hint, const char *pass_info,                  return TRUE;
215                         char *desc, int size)                  
216  {              case IDCANCEL:
217      gpgme_pubkey_algo_t algo;                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
218      char usedkey[16+1], mainkey[16+1];                  c->cancel = 1;
219      char *uid, *p;                  EndDialog (dlg, FALSE);
220      int n=0;                  return FALSE;
221                }
222      while (p = strsep ((char**)&pass_info, " ")) {              break;
223          switch (n++) {      }
224          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;      
225          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;      return FALSE;
226          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;  }
227          }  
228      }  
229      uid_hint += 16; /* skip keyid */  /* Extract the main keyid from @pass_info.
230      uid_hint += 1;  /* space */     Return value: long main keyid or NULL for an error. */
231    static const char*
232      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));  parse_gpg_keyid (const char *pass_info)
233    {
234      if (strcmp (usedkey, mainkey))      static char keyid[16+1];
235          _snprintf (desc, size-1,      
236                     _("You need a passphrase to unlock the secret key for\n"      /* XXX: check for leading alpha-chars? */
237                       "user: \"%s\"\n"      if (strlen (pass_info) < 16)
238                       "%s key, ID %s (main key ID %s)\n"),          return NULL;
239                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);      /* the format of the desc buffer looks like this:
240      else if (!strcmp (usedkey, mainkey))         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
241          _snprintf (desc, size-1,         we use the main keyid to use only one cache entry. */
242                     _("You need a passphrase to unlock the secret key for\n"      strncpy (keyid, pass_info+17, 16);
243                       "user: \"%s\"\n"      keyid[16] = 0;
244                       "%s key, ID %s\n"),      return keyid;
245                       uid, get_key_pubalgo (algo), usedkey+8);  }
246      free (uid);  
247  }  
248    /* Parse the information in @uid_hint and @pass_info to generate
249       a input message for the user in @desc. */
250  static int inline  static int
251  is_hexstring (const char * p)  parse_gpg_description (const char *uid_hint, const char *pass_info,
252  {                         char *desc, int size)
253      size_t i;  {
254        gpgme_pubkey_algo_t algo;
255      for (i=0; i < strlen (p); i++) {      char usedkey[16+1];
256          if (!isxdigit (p[i]))      char mainkey[16+1];
257              return -1;      char *uid, *p;
258      }      int n=0;
259      return 0;  
260  }      algo = (gpgme_pubkey_algo_t)0;
261        /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
262        if (strlen (uid_hint) < 17) {
263  /* Passphrase callback with the ability to support caching. */          *desc = 0;
264  gpgme_error_t          return -1;
265  passphrase_cb (void *hook, const char *uid_hint,      }
266                 const char *passphrase_info,  
267                 int prev_was_bad, int fd)      while (p = strsep ((char**)&pass_info, " ")) {
268  {          switch (n++) {
269      passphrase_cb_s *c = (passphrase_cb_s*)hook;          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
270      HANDLE hd = (HANDLE)fd;          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
271      void *item;          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
272      const char *keyid, *pass;          }
273      DWORD n;      }
274      int rc;      uid_hint += 16; /* skip keyid */
275        uid_hint += 1;  /* space */
276      /* XXX: pubkey_enc cancel does not quit gpg.exe */  
277      /* XXX: handle prev_was_bad case. */      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
278      if (!c)  
279          return gpg_error (GPG_ERR_INV_ARG);      if (strcmp (usedkey, mainkey))
280            _snprintf (desc, size-1,
281      if (passphrase_info) {                     _("You need a passphrase to unlock the secret key for\n"
282          keyid = parse_gpg_keyid (passphrase_info);                       "user: \"%s\"\n"
283          pass = agent_get_cache (keyid+8, &item);                       "%s key, ID %s (main key ID %s)\n"),
284          if (pass) {                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
285              agent_unlock_cache_entry (&item);      else if (!strcmp (usedkey, mainkey))
286              c->pwd_init = 0;          _snprintf (desc, size-1,
287              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))                     _("You need a passphrase to unlock the secret key for\n"
288                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);                       "user: \"%s\"\n"
289              if (!WriteFile (hd, "\n", 1, &n, NULL))                       "%s key, ID %s\n"),
290                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);                       uid, get_key_pubalgo (algo), usedkey+8);
291              return 0;      free (uid);
292          }      return 0;
293      }  }
294    
295      if (c->pwd_init) {  
296          if (keyid && strlen (keyid) == 16)  /* Extract the serial number from the card ID @id and return it. */
297              strcpy (c->keyid, keyid+8);  const char*
298    extract_serial_no (const char *id)
299          /* if the desc has a length of 32 and only hex digits, we assume a  {
300             smart card has been used. */      static char buf[8];
301          if (uid_hint && strlen (uid_hint) == 32 && !is_hexstring (uid_hint)) {      char *p;
302              char buf[16];  
303              memset (buf, 0, sizeof buf);      p = strchr (id, '/');
304              strncpy (buf, uid_hint+20, 8);      if (!p)
305              _snprintf (c->info, sizeof c->info-1,          return NULL;
306                         _("Please enter the PIN to unlock your secret card key\n"      strncpy (buf, id+(p-id)-6, 6);
307                           "Card: %s"), buf);      return buf;
308              c->is_card = 1;  }
309          }  
310          else if (uid_hint)  
311              parse_gpg_description (uid_hint, passphrase_info,  /* Passphrase callback with the ability to support caching. */
312                                     c->info, sizeof c->info - 1);  gpgme_error_t
313          if (c->gpg_cmd == GPG_CMD_DECRYPT) {  passphrase_cb (void *hook, const char *uid_hint,
314              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,                 const char *passphrase_info,
315                                   (HWND)c->hwnd, passphrase_callback_proc,                 int prev_was_bad, int fd)
316                                   (LPARAM)c);  {
317          }      passphrase_cb_s *c = (passphrase_cb_s*)hook;
318          else if (c->gpg_cmd == GPG_CMD_SIGN) {      HANDLE hd = (HANDLE)fd;
319              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,      void *item;
320                                   (HWND)c->hwnd, passphrase_callback_proc,      const char *keyid=NULL, *pass;
321                                   (LPARAM)c);      DWORD n;
322          }      int rc=0;
323          if (rc == -1) {  
324              WriteFile (hd, "\n", 1, &n, NULL);      if (!c)
325              return gpg_error (GPG_ERR_EOF);          return gpg_error (GPG_ERR_INV_ARG);
326          }      c->bad_pwd = prev_was_bad? 1 : 0;
327          c->pwd_init = 0;      if (prev_was_bad && !c->cancel) {
328      }          if (c->pwd)
329      if (c->cancel) {              burn_passphrase (&c->pwd);
330          WriteFile (hd, "\n", 1, &n, NULL);          agent_del_cache (c->keyid);
331          return gpg_error (GPG_ERR_EOF);          c->pwd_init = 1;
332      }      }
333    
334      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);      if (passphrase_info) {
335      WriteFile (hd, "\n", 1, &n, NULL);          if (strlen (passphrase_info) < 16 &&
336      return 0;              !strstr (passphrase_info, "OPENPGP")) {
337  }              /* assume symetric encryption. */
338                int pos=2;
339                c->sym.sym_algo = atoi (passphrase_info);
340  /* Initialize the given passphrase callback @cb with the              if (c->sym.sym_algo > 9)
341     used gpgme context @ctx, the command @cmd and a title                  pos++;
342     @title for the dialog. */              /* XXX: be more strict. */
343  void              c->sym.s2k_mode = atoi (passphrase_info+pos);
344  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
345                         int cmd, HWND hwnd, const char *title)          }
346  {  
347      memset (cb, 0, sizeof *cb);          keyid = parse_gpg_keyid (passphrase_info);
348      cb->gpg_cmd = cmd;          pass = agent_get_cache (keyid+8, &item);
349      cb->is_card = 0;          if (pass) {
350      cb->cancel = 0;              agent_unlock_cache_entry (&item);
351      cb->hwnd = hwnd;              c->pwd_init = 0;
352      cb->pwd_init = 1;              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
353      free_if_alloc (cb->title);                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
354      cb->title = m_strdup (title);              if (!WriteFile (hd, "\n", 1, &n, NULL))
355      if (!cb->title)                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
356          BUG (NULL);              return 0;
357      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);          }
358      cb->gpg = ctx;      }
359  }  
360        if (c->pwd_init) {
361            if (keyid && strlen (keyid) == 16)
362  /* Release a passphrase callback @ctx. */              strcpy (c->keyid, keyid+8);
363  void  
364  release_gpg_passphrase_cb (passphrase_cb_s *ctx)          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
365  {              has been used. */
366      if (!ctx)          if (strstr (passphrase_info, "OPENPGP")) {
367          return;              const char *s=passphrase_info;
368      sfree_if_alloc (ctx->pwd);              while (s && *s && *s != 'D')
369      free_if_alloc (ctx->title);                  s++;
370  }              _snprintf (c->info, sizeof c->info-1,
371                           _("Please enter the PIN to unlock your secret card key\n"
372  /* Simple check to measure passphrase (@pass) quality.                           "Card: %s"), extract_serial_no (s));
373     Return value: 0 on success. */              c->is_card = 1;
374  int          }
375  check_passwd_quality (const char *pass, int strict)          else if (uid_hint)
376  {              parse_gpg_description (uid_hint, passphrase_info,
377      int i, nd=0, nc=0, n;                                     c->info, sizeof c->info - 1);
378            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
379      n = strlen (pass);              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
380      if (n < 8)                                   (HWND)c->hwnd, passphrase_callback_proc,
381          return -1;                                   (LPARAM)c);
382            }
383      for (i=0; i < n; i++) {          else if (c->gpg_cmd == GPG_CMD_SIGN) {
384          if (isdigit (pass[i])) nd++;              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
385          if (isalpha (pass[i])) nc++;                                   (HWND)c->hwnd, passphrase_callback_proc,
386      }                                   (LPARAM)c);
387            }
388      if (nd == n || nc == n)          if (rc == -1) {
389          return -1;              if (!WriteFile (hd, "\n", 1, &n, NULL))
390                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
391      return 0;              return 0;
392  }          }
393            c->pwd_init = 0;
394        }
395        if (c->cancel) {
396            if (!WriteFile (hd, "\n", 1, &n, NULL))
397                log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
398            return 0;
399        }
400    
401        WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);
402        WriteFile (hd, "\n", 1, &n, NULL);
403        return 0;
404    }
405    
406    
407    /* Initialize the given passphrase callback @cb with the
408       used gpgme context @ctx, the command @cmd and a title
409       @title for the dialog. */
410    void
411    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
412                           int cmd, HWND hwnd, const char *title)
413    {
414        memset (cb, 0, sizeof *cb);
415        cb->gpg_cmd = cmd;
416        cb->bad_pwd = 0;
417        cb->is_card = 0;
418        cb->cancel = 0;
419        cb->hwnd = hwnd;
420        cb->pwd_init = 1;
421        free_if_alloc (cb->title);
422        cb->title = m_strdup (title);
423        if (!cb->title)
424            BUG (NULL);
425        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
426        cb->gpg = ctx;
427    }
428    
429    
430    /* Release a passphrase callback @ctx. */
431    void
432    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
433    {
434        gpgme_recipient_t r, n;
435    
436        if (!ctx)
437            return;
438        sfree_if_alloc (ctx->pwd);
439        free_if_alloc (ctx->title);
440        r = ctx->recipients;
441        while (r) {
442            n = r->next;
443            safe_free (r->keyid);
444            safe_free (r);
445            r = n;
446        }
447    }
448    
449    
450    /* Simple check to measure passphrase (@pass) quality.
451       Return value: 0 on success. */
452    int
453    check_passwd_quality (const char *pass, int strict)
454    {
455        int i, nd=0, nc=0, n;
456    
457        n = strlen (pass);
458        if (n < 8)
459            return -1;
460    
461        for (i=0; i < n; i++) {
462            if (isdigit (pass[i]))
463                nd++;
464            if (isalpha (pass[i]))
465                nc++;
466        }
467    
468        /* check that the passphrase contains letters and numbers. */
469        if (nd == n || nc == n)
470            return -1;
471    
472        return 0;
473    }
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