/[winpt]/trunk/Src/wptPassphraseCB.cpp
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revision 28 by twoaday, Thu Oct 20 12:35:59 2005 UTC revision 105 by twoaday, Wed Nov 30 10:22:00 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  const char* get_symkey_algo (int algo);  #include "wptKeylist.h"
41    #include "wptAgent.h"
42  #define item_ctrl_id( cmd ) \  #include "wptRegistry.h"
43      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)  
44    const char* get_symkey_algo (int algo);
45  #define item_ctrl_id2(cmd) \  
46      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)  #define item_ctrl_id( cmd ) \
47        ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
48    
49  /* Overwrite passphrase and free memory. */  #define item_ctrl_id2(cmd) \
50  static void      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
51  burn_passphrase (char **pwd)  
52  {  
53      char *pass = *pwd;    /* Overwrite passphrase and free memory. */
54      memset (pass, 0, strlen (pass));  static void
55      delete []pass;  burn_passphrase (char **pwd)
56      *pwd = NULL;  {
57  }      char *pass = *pwd;
58        wipememory (pass, strlen (pass));
59        delete []pass;
60  /* Dialog procedure for the passphrase callback. */      *pwd = NULL;
61  static BOOL CALLBACK  }
62  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)  
63  {      
64      static passphrase_cb_s * c;  /* Dialog procedure for the passphrase callback. */
65      gpgme_decrypt_result_t res;  static BOOL CALLBACK
66      gpgme_sign_result_t res_sig;  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
67      gpgme_key_t key;  {    
68      void *ctx = NULL, *item;      static passphrase_cb_s *c;
69      const char *id;      gpgme_decrypt_result_t res=NULL;
70      char *info;      gpgme_sign_result_t res_sig=NULL;
71      int n;      gpgme_key_t key;
72        gpgme_recipient_t recip=NULL, r;
73      /* XXX: we need a timer to update the 'enc_to' entries. */      void *item;
74      switch (msg) {      const char *id;
75      case WM_INITDIALOG:      char *info;
76          c = (passphrase_cb_s *)lparam;      int n;
77          if (!c)  
78              BUG (0);      switch (msg) {
79          SetWindowText (dlg, c->title);      case WM_INITDIALOG:
80          if (c->gpg_cmd == GPG_CMD_DECRYPT) {          c = (passphrase_cb_s *)lparam;
81              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,          if (!c)
82                  _("Encrypted with the following public key(s)") );              BUG (0);
83              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
84          }          SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
85          else if (c->gpg_cmd == GPG_CMD_SIGN)          SetWindowText (dlg, c->title);
86              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
87          res = gpgme_op_decrypt_result (c->gpg);              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
88          if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {                              _("Encrypted with the following public key(s)"));
89              gpgme_recipient_t r;              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
90            }
91              /* XXX: not all ENCRYPT_TO entries are listed here. */          else if (c->gpg_cmd == GPG_CMD_SIGN) {
92              for (r = res->recipients; r; r = r->next) {              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
93                  get_pubkey (r->keyid, &key);              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
94                  if (key) {          }
95                      char *uid;          if (c->recipients)
96                      id = key->uids->name;              recip = c->recipients; /* recipients were already extracted. */
97                      if (!id)          else {
98                          id = _("Invalid User ID");              /* XXX: not all ENCRYPT_TO entries are listed here. */
99                      uid = utf8_to_wincp (id, strlen (id));              res = gpgme_op_decrypt_result (c->gpg);
100                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1              if (res && res->recipients)
101                                       + strlen (key->uids->email)+1];                  recip = res->recipients;
102                      if (!info)          }
103                          BUG (NULL);          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
104                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,              for (r = res->recipients; r; r = r->next) {
105                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                  get_pubkey (r->keyid, &key);
106                      free (uid);                  if (key) {
107                                            char *uid;
108                  }                      id = key->uids->name;
109                  else {                      if (!id)
110                      info = new char [32 + strlen (r->keyid)+1 + 4];                          id = _("Invalid User ID");
111                      if (!info)                      uid = utf8_to_wincp (id, strlen (id));
112                          BUG (NULL);                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1
113                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),                                       + strlen (key->uids->email)+1];
114                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                      if (!info)
115                  }                          BUG (NULL);
116                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,
117                  free_if_alloc (info);                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
118              }                      free (uid);
119          }                      
120          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                  }
121              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);                  else {
122          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?                      info = new char [32 + strlen (r->keyid)+1 + 4];
123                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                      if (!info)
124                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :                          BUG (NULL);
125                          _("Please enter your passphrase"));                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
126          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
127              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));                  }
128              if (res && !res->recipients) {                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
129                  const char *s = _("Symmetric encryption.\n"                  free_if_alloc (info);
130                                    "%s encrypted data.");              }
131                  const char *alg = get_symkey_algo (c->sym.sym_algo);          }
132                  info = new char[strlen (s) + strlen (alg) + 2];          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
133                  if (!info)              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
134                      BUG (NULL);          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
135                  sprintf (info, s, alg);                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
136                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
137                  free_if_alloc (info);                          _("Please enter your passphrase"));
138              }          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
139              else              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
140                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);              if (res && !res->recipients) {
141          }                  const char *s = _("Symmetric encryption.\n"
142          else {                                    "%s encrypted data.");
143              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));                  const char *alg = get_symkey_algo (c->sym.sym_algo);
144              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);                  info = new char[strlen (s) + strlen (alg) + 2];
145          }                  if (!info)
146          center_window (dlg, NULL);                      BUG (NULL);
147          SetForegroundWindow (dlg);                  sprintf (info, s, alg);
148          set_active_window (dlg);                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
149          return FALSE;                  free_if_alloc (info);
150                }
151          case WM_SYSCOMMAND:              else
152              if (LOWORD (wparam) == SC_CLOSE) {                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
153                  SetDlgItemText (dlg, item_ctrl_id( c->gpg_cmd ), "");          }
154                  c->cancel = 1;          else {
155                  EndDialog (dlg, TRUE);              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
156              }              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
157              break;          }
158            center_window (dlg, NULL);
159          case WM_COMMAND:          SetForegroundWindow (dlg);
160              switch( HIWORD( wparam ) ) {          set_active_window (dlg);
161              case BN_CLICKED:          return FALSE;
162                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE  
163                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {          case WM_SYSCOMMAND:
164                      HWND hwnd;              if (LOWORD (wparam) == SC_CLOSE) {
165                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
166                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));                  c->cancel = 1;
167                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);                  EndDialog (dlg, TRUE);
168                      SetFocus (hwnd);              }
169                  }              break;
170              }  
171            case WM_COMMAND:
172              switch (LOWORD (wparam)) {              switch (HIWORD (wparam)) {
173              case IDOK:                case BN_CLICKED:
174                  /* fixme: the item is even cached when the passphrase is not                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
175                            correct, which means that the user needs to delete all                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
176                            cached entries to continue. */                      HWND hwnd;
177                  if (c->pwd)                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
178                      burn_passphrase (&c->pwd);                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
179                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
180                  if (!n) {                      SetFocus (hwnd);
181                      c->pwd = new char[2];                  }
182                      if (!c->pwd)              }
183                          BUG (NULL);  
184                      strcpy (c->pwd, "");              switch (LOWORD (wparam)) {
185                  }              case IDOK:  
186                  else {                  /* XXX: the item is even cached when the passphrase is not
187                      c->pwd = new char[n+2];                          correct, which means that the user needs to delete all
188                      if (!c->pwd)                          cached entries to continue. */
189                          BUG (NULL);                  if (c->pwd)
190                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);                      burn_passphrase (&c->pwd);
191                  }                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
192                  res = gpgme_op_decrypt_result (c->gpg);                  if (!n) {
193                  if (!res)                      c->pwd = new char[2];
194                      res_sig = gpgme_op_sign_result (c->gpg);                      if (!c->pwd)
195                  if (reg_prefs.cache_time > 0 && !c->is_card &&                          BUG (NULL);
196                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                      strcpy (c->pwd, "");
197                      if (agent_get_cache (c->keyid, &item))                  }
198                          agent_unlock_cache_entry (&item);                  else {
199                      else                      c->pwd = new char[n+2];
200                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                      if (!c->pwd)
201                  }                          BUG (NULL);
202                  EndDialog (dlg, TRUE);                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
203                  return TRUE;                  }
204                                    res = gpgme_op_decrypt_result (c->gpg);
205              case IDCANCEL:                  if (!res)
206                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                      res_sig = gpgme_op_sign_result (c->gpg);            
207                  c->cancel = 1;                  if (reg_prefs.cache_time > 0 && !c->is_card &&
208                  EndDialog (dlg, FALSE);                      (res || res_sig)) {
209                  return FALSE;                      if (agent_get_cache (c->keyid, &item))                      
210              }                          agent_unlock_cache_entry (&item);
211              break;                      else
212      }                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
213                        }
214      return FALSE;                  c->cancel = 0;
215  }                  EndDialog (dlg, TRUE);
216                    return TRUE;
217                    
218  /* Extract the main keyid from @pass_info.              case IDCANCEL:
219     Return value: long main keyid or NULL for an error. */                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
220  static const char*                  c->cancel = 1;
221  parse_gpg_keyid (const char *pass_info)                  EndDialog (dlg, FALSE);
222  {                  return FALSE;
223      static char keyid[16+1];              }
224                    break;
225      /* XXX: check for leading alpha-chars? */      }
226      if (strlen (pass_info) < 16)      
227          return NULL;      return FALSE;
228      /* the format of the desc buffer looks like this:  }
229         request_keyid[16] main_keyid[16] keytype[1] keylength[4]  
230         we use the main keyid to use only one cache entry. */  
231      strncpy (keyid, pass_info+17, 16);  /* Extract the main keyid from @pass_info.
232      keyid[16] = 0;     Return value: long main keyid or NULL for an error. */
233      return keyid;  static const char*
234  }  parse_gpg_keyid (const char *pass_info)
235    {
236        static char keyid[16+1];
237  /* Parse the information in @uid_hint and @pass_info to generate      
238     a input message for the user in @desc. */      /* XXX: check for leading alpha-chars? */
239  static int      if (strlen (pass_info) < 16) {
240  parse_gpg_description (const char *uid_hint, const char *pass_info,          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
241                         char *desc, int size)          return NULL;
242  {      }
243      gpgme_pubkey_algo_t algo;      /* the format of the desc buffer looks like this:
244      char usedkey[16+1], mainkey[16+1];         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
245      char *uid, *p;         we use the main keyid to use only one cache entry. */
246      int n=0;      strncpy (keyid, pass_info+17, 16);
247        keyid[16] = 0;
248      if (strlen (uid_hint) < 17) {      return keyid;
249          *desc = 0;  }
250          return -1;  
251      }  
252    /* Parse the information in @uid_hint and @pass_info to generate
253      while (p = strsep ((char**)&pass_info, " ")) {     a input message for the user in @desc. */
254          switch (n++) {  static int
255          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;  parse_gpg_description (const char *uid_hint, const char *pass_info,
256          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;                         char *desc, int size)
257          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;  {
258          }      gpgme_pubkey_algo_t algo;
259      }      char usedkey[16+1];
260      uid_hint += 16; /* skip keyid */      char mainkey[16+1];
261      uid_hint += 1;  /* space */      char *uid, *p;
262        int n=0;
263      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));  
264        algo = (gpgme_pubkey_algo_t)0;
265      if (strcmp (usedkey, mainkey))      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
266          _snprintf (desc, size-1,      if (strlen (uid_hint) < 17) {
267                     _("You need a passphrase to unlock the secret key for\n"          *desc = 0;
268                       "user: \"%s\"\n"          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
269                       "%s key, ID %s (main key ID %s)\n"),          return -1;
270                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);      }
271      else if (!strcmp (usedkey, mainkey))  
272          _snprintf (desc, size-1,      while (p = strsep ((char**)&pass_info, " ")) {
273                     _("You need a passphrase to unlock the secret key for\n"          switch (n++) {
274                       "user: \"%s\"\n"          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
275                       "%s key, ID %s\n"),          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
276                       uid, get_key_pubalgo (algo), usedkey+8);          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
277      free (uid);          }
278      return 0;      }
279  }      uid_hint += 16; /* skip keyid */
280        uid_hint += 1;  /* space */
281    
282  /*      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
283  static int inline  
284  is_hexstring (const char * p)      if (strcmp (usedkey, mainkey))
285  {          _snprintf (desc, size-1,
286      size_t i;                     _("You need a passphrase to unlock the secret key for\n"
287                         "user: \"%s\"\n"
288      for (i=0; i < strlen (p); i++) {                       "%s key, ID %s (main key ID %s)\n"),
289          if (!isxdigit (p[i]))                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
290              return -1;      else if (!strcmp (usedkey, mainkey))
291      }          _snprintf (desc, size-1,
292      return 0;                     _("You need a passphrase to unlock the secret key for\n"
293  }                       "user: \"%s\"\n"
294  */                       "%s key, ID %s\n"),
295                         uid, get_key_pubalgo (algo), usedkey+8);
296        free (uid);
297  /* Extract the serial number from the card ID @id and return it. */      return 0;
298  const char*  }
299  extract_serial_no (const char *id)  
300  {  
301      static char buf[8];  /* Extract the serial number from the card ID @id and return it. */
302      char *p;  const char*
303    extract_serial_no (const char *id)
304      p = strchr (id, '/');  {
305      if (!p)      static char buf[8];
306          return NULL;      char *p;
307      strncpy (buf, id+(p-id)-6, 6);  
308      return buf;      p = strchr (id, '/');
309  }      if (!p) {
310            log_debug ("extract_serial_no: error '%s'\r\n", id);
311            return NULL;
312  /* Passphrase callback with the ability to support caching. */      }
313  gpgme_error_t      strncpy (buf, id+(p-id)-6, 6);
314  passphrase_cb (void *hook, const char *uid_hint,      return buf;
315                 const char *passphrase_info,  }
316                 int prev_was_bad, int fd)  
317  {  
318      passphrase_cb_s *c = (passphrase_cb_s*)hook;  /* Passphrase callback with the ability to support caching. */
319      HANDLE hd = (HANDLE)fd;  gpgme_error_t
320      void *item;  passphrase_cb (void *hook, const char *uid_hint,
321      const char *keyid, *pass;                 const char *passphrase_info,
322      DWORD n;                 int prev_was_bad, int fd)
323      int rc;  {
324        passphrase_cb_s *c = (passphrase_cb_s*)hook;
325      if (!c)      HANDLE hd = (HANDLE)fd;
326          return gpg_error (GPG_ERR_INV_ARG);      void *item;
327      c->bad_pwd = prev_was_bad? 1 : 0;      const char *keyid=NULL, *pass;
328      if (prev_was_bad && !c->cancel) {      DWORD n;
329          if (c->pwd)      int rc = 0;
330              burn_passphrase (&c->pwd);  
331          agent_del_cache (c->keyid);      if (!c) {
332          c->pwd_init = 1;          log_debug ("passphrase_cb: error '!c'\r\n");
333      }          return gpg_error (GPG_ERR_INV_ARG);
334        }
335      if (passphrase_info) {      c->bad_pwd = prev_was_bad? 1 : 0;
336          if (strlen (passphrase_info) < 16 &&      if (prev_was_bad && !c->cancel) {
337              !strstr (passphrase_info, "OPENPGP")) {/* assume symetric encryption. */          if (c->pwd)
338              int n=2;              burn_passphrase (&c->pwd);
339              c->sym.sym_algo = atoi (passphrase_info);          agent_del_cache (c->keyid);
340              if (c->sym.sym_algo > 9)          c->pwd_init = 1;
341                  n++;      }
342              /* XXX: be more strict. */  
343              c->sym.s2k_mode = atoi (passphrase_info+n);      if (passphrase_info) {
344              c->sym.s2k_hash = atoi (passphrase_info+n+2);          if (strlen (passphrase_info) < 16 &&
345          }              !strstr (passphrase_info, "OPENPGP")) {
346                /* assume symetric encryption. */
347          keyid = parse_gpg_keyid (passphrase_info);              int pos=2;
348          pass = agent_get_cache (keyid+8, &item);              c->sym.sym_algo = atoi (passphrase_info);
349          if (pass) {              if (c->sym.sym_algo > 9)
350              agent_unlock_cache_entry (&item);                  pos++;
351              c->pwd_init = 0;              /* XXX: be more strict. */
352              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))              c->sym.s2k_mode = atoi (passphrase_info+pos);
353                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
354              if (!WriteFile (hd, "\n", 1, &n, NULL))          }
355                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);  
356              return 0;          keyid = parse_gpg_keyid (passphrase_info);
357          }          pass = agent_get_cache (keyid+8, &item);        
358      }          if (pass) {
359                agent_unlock_cache_entry (&item);
360      if (c->pwd_init) {              c->pwd_init = 0;
361          if (keyid && strlen (keyid) == 16)              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
362              strcpy (c->keyid, keyid+8);                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
363                if (!WriteFile (hd, "\n", 1, &n, NULL))
364          /* if @passphrase_info contains 'OPENPGP' we assume a smart card                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
365              has been used. */              return 0;
366          if (strstr (passphrase_info, "OPENPGP")) {          }
367              const char *s=passphrase_info;      }
368              while (s && *s && *s != 'D')  
369                  s++;      if (c->pwd_init) {
370              _snprintf (c->info, sizeof c->info-1,          if (keyid && strlen (keyid) == 16)
371                         _("Please enter the PIN to unlock your secret card key\n"              strcpy (c->keyid, keyid+8);
372                           "Card: %s"), extract_serial_no (s));  
373              c->is_card = 1;          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
374          }              has been used. */
375          else if (uid_hint)          if (strstr (passphrase_info, "OPENPGP")) {
376              parse_gpg_description (uid_hint, passphrase_info,              const char *s=passphrase_info;
377                                     c->info, sizeof c->info - 1);              while (s && *s && *s != 'D')
378          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                  s++;
379              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,              _snprintf (c->info, sizeof c->info-1,
380                                   (HWND)c->hwnd, passphrase_callback_proc,                         _("Please enter the PIN to unlock your secret card key\n"
381                                   (LPARAM)c);                           "Card: %s"), extract_serial_no (s));
382          }              c->is_card = 1;
383          else if (c->gpg_cmd == GPG_CMD_SIGN) {          }
384              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,          else if (uid_hint)
385                                   (HWND)c->hwnd, passphrase_callback_proc,              parse_gpg_description (uid_hint, passphrase_info,
386                                   (LPARAM)c);                                     c->info, sizeof c->info - 1);
387          }          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
388          if (rc == -1) {              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
389              WriteFile (hd, "\n", 1, &n, NULL);                                   (HWND)c->hwnd, passphrase_callback_proc,
390              return 0;                                   (LPARAM)c);
391          }          }
392          c->pwd_init = 0;          else if (c->gpg_cmd == GPG_CMD_SIGN) {
393      }              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
394      if (c->cancel) {                                   (HWND)c->hwnd, passphrase_callback_proc,
395          WriteFile (hd, "\n", 1, &n, NULL);                                   (LPARAM)c);
396          return 0;          }
397      }          if (rc == -1) {
398                if (!WriteFile (hd, "\n", 1, &n, NULL))
399      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
400      WriteFile (hd, "\n", 1, &n, NULL);              return 0;
401      return 0;          }
402  }          c->pwd_init = 0;
403        }
404        if (c->cancel) {
405  /* Initialize the given passphrase callback @cb with the          if (!WriteFile (hd, "\n", 1, &n, NULL))
406     used gpgme context @ctx, the command @cmd and a title              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
407     @title for the dialog. */          return 0;
408  void      }
409  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,  
410                         int cmd, HWND hwnd, const char *title)      if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
411  {          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
412      memset (cb, 0, sizeof *cb);      if (!WriteFile (hd, "\n", 1, &n, NULL))
413      cb->gpg_cmd = cmd;          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
414      cb->bad_pwd = 0;      return 0;
415      cb->is_card = 0;  }
416      cb->cancel = 0;  
417      cb->hwnd = hwnd;  
418      cb->pwd_init = 1;  /* Initialize the given passphrase callback @cb with the
419      free_if_alloc (cb->title);     used gpgme context @ctx, the command @cmd and a title
420      cb->title = m_strdup (title);     @title for the dialog. */
421      if (!cb->title)  void
422          BUG (NULL);  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
423      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);                         int cmd, HWND hwnd, const char *title)
424      cb->gpg = ctx;  {
425  }      memset (cb, 0, sizeof *cb);
426        cb->gpg_cmd = cmd;
427        cb->bad_pwd = 0;
428  /* Release a passphrase callback @ctx. */      cb->is_card = 0;
429  void      cb->cancel = 0;
430  release_gpg_passphrase_cb (passphrase_cb_s *ctx)      cb->hwnd = hwnd;
431  {      cb->pwd_init = 1;
432      if (!ctx)      free_if_alloc (cb->title);
433          return;      cb->title = m_strdup (title);
434      sfree_if_alloc (ctx->pwd);      if (!cb->title)
435      free_if_alloc (ctx->title);          BUG (NULL);
436  }      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
437        cb->gpg = ctx;
438    }
439  /* Simple check to measure passphrase (@pass) quality.  
440     Return value: 0 on success. */  
441  int  /* Release a passphrase callback @ctx. */
442  check_passwd_quality (const char *pass, int strict)  void
443  {  release_gpg_passphrase_cb (passphrase_cb_s *ctx)
444      int i, nd=0, nc=0, n;  {
445        gpgme_recipient_t r, n;
446      n = strlen (pass);  
447      if (n < 8)      if (!ctx)
448          return -1;          return;
449        sfree_if_alloc (ctx->pwd);
450      for (i=0; i < n; i++) {      free_if_alloc (ctx->title);
451          if (isdigit (pass[i])) nd++;      r = ctx->recipients;
452          if (isalpha (pass[i])) nc++;      while (r) {
453      }          n = r->next;
454            safe_free (r->keyid);
455      if (nd == n || nc == n)          safe_free (r);
456          return -1;          r = n;
457        }
458      return 0;  }
459  }  
460    
461    /* Simple check to measure passphrase (@pass) quality.
462       Return value: 0 on success. */
463    int
464    check_passwd_quality (const char *pass, int strict)
465    {
466        int i, nd=0, nc=0, n;
467    
468        n = strlen (pass);
469        if (n < 8)
470            return -1;
471    
472        for (i=0; i < n; i++) {
473            if (isdigit (pass[i]))
474                nd++;
475            if (isalpha (pass[i]))
476                nc++;
477        }
478    
479        /* check that the passphrase contains letters and numbers. */
480        if (nd == n || nc == n)
481            return -1;
482    
483        return 0;
484    }

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