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

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revision 24 by twoaday, Sat Oct 8 10:43:08 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   *      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 "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_decrypt_result_t res;  void ListBox_AddString_utf8 (HWND lb, const char *txt);
54      gpgme_sign_result_t res_sig;  
55      gpgme_key_t key;  
56      const char *id;  /* Overwrite passphrase and free memory. */
57      char *info;  static void
58      void *ctx = NULL, *item;  burn_passphrase (char **pwd)
59      int n;  {
60        char *pass = *pwd;
61      switch (msg) {      wipememory (pass, strlen (pass));
62      case WM_INITDIALOG:      delete []pass;
63          c = (passphrase_cb_s *)lparam;      *pwd = NULL;
64          if (!c)  }
65              BUG (0);  
66          SetWindowText (dlg, c->title);  
67          if (c->gpg_cmd == GPG_CMD_DECRYPT) {  /* Dialog procedure for the passphrase callback. */
68              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,  static BOOL CALLBACK
69                  _("Encrypted with the following public key(s)") );  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
70              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );  {    
71          }      static passphrase_cb_s *c;
72          else if( c->gpg_cmd == GPG_CMD_SIGN )      gpgme_decrypt_result_t res=NULL;
73              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);      gpgme_sign_result_t res_sig=NULL;
74          res = gpgme_op_decrypt_result (c->gpg);      gpgme_recipient_t recip=NULL, r;
75          if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {      winpt_key_s key;
76              gpgme_recipient_t r;      void *item;
77        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->name;      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 [16+strlen (uid) + 4 + strlen (r->keyid) + strlen (key->uids->email) +  3];      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> (%s, 0x%s)", uid, key->uids->email,  
90                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);      case WM_INITDIALOG:
91                      free (uid);          c = (passphrase_cb_s *)lparam;
92                                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                  }              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
101                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);          }
102                  free (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          else if (c->gpg_cmd == GPG_CMD_DECRYPT)          }
106              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);          /* Because it depends on the order the keys are stored in the
107          SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?             keyring whether res->recipients is complete or not, we also
108                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,             support that the recipients were externally extracted and then
109                          _("Please enter your passphrase") );             we use this list. */
110          if (c->gpg_cmd == GPG_CMD_DECRYPT) {          if (c->recipients)
111              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));              recip = c->recipients; /* recipients were already extracted. */
112              if (res && !res->recipients)          else {
113                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, _("Symmetric encryption.\n"));                                                                  res = gpgme_op_decrypt_result (c->gpg);
114              else              if (res && res->recipients)
115                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                  recip = res->recipients;
116          }          }
117          else {          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
118              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));              for (r = recip; r; r = r->next) {
119              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);                  memset (&key, 0, sizeof (key));
120          }                  if (!winpt_get_pubkey (r->keyid, &key)) {
121          center_window (dlg, NULL);                      gpgme_user_id_t u = key.ctx->uids;
122          SetForegroundWindow (dlg);  
123          set_active_window (dlg);                      id = u->name;
124          return FALSE;                      if (!id)
125                            id = _("Invalid User ID");
126          case WM_SYSCOMMAND:                      n = 32+strlen (id)+1+4+strlen (r->keyid)+1;
127              if( LOWORD( wparam ) == SC_CLOSE ) {                      if (u->email)
128                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );                          n += strlen (u->email)+1;
129                  c->cancel = 1;                      info = new char [n+1];
130                  EndDialog( dlg, TRUE );                      if (!info)
131              }                          BUG (NULL);
132              break;                      if (!u->email || strlen (u->email) < 1)
133                            sprintf (info, "%s (%s, 0x%s)", id,
134          case WM_COMMAND:                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
135              switch( HIWORD( wparam ) ) {                      else
136              case BN_CLICKED:                          sprintf (info, "%s <%s> (%s, 0x%s)", id, u->email,
137                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
138                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                  }
139                      HWND hwnd;                  else {
140                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));                      info = new char [32 + strlen (r->keyid)+1 + 4];
141                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));                      if (!info)
142                      SendMessage( hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0 );                          BUG (NULL);
143                      SetFocus (hwnd);                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
144                  }                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
145              }                  }
146                    ListBox_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
147              switch (LOWORD (wparam)) {                  free_if_alloc (info);
148              case IDOK:                    winpt_release_pubkey (&key);
149                  /* fixme: the item is even cached when the passphrase is not              }
150                            correct, which means that the user needs to delete all          }
151                            cached entries to continue. */          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
152                  if (c->pwd) {              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
153                      delete []c->pwd;          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
154                      c->pwd = NULL;                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
155                  }                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
156                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));                          _("Please enter your passphrase"));
157                  if (!n) {          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
158                      c->pwd = new char[2];              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
159                      strcpy (c->pwd, "");              if (res && !res->recipients) {
160                  }                  const char *s = _("Symmetric encryption.\n"
161                  else {                                    "%s encrypted data.");
162                      c->pwd = new char[n+2];                  const char *alg = get_symkey_algo (c->sym.sym_algo);
163                      if (!c->pwd)                  info = new char[strlen (s) + strlen (alg) + 2];
164                          BUG (NULL);                  if (!info)
165                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);                      BUG (NULL);
166                  }                  sprintf (info, s, alg);
167                  res = gpgme_op_decrypt_result (c->gpg);                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
168                  if (!res)                  free_if_alloc (info);
169                      res_sig = gpgme_op_sign_result (c->gpg);              }
170                  if (reg_prefs.cache_time > 0 && !c->is_card &&              else
171                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
172                      if (agent_get_cache (c->keyid, &item))          }
173                          agent_unlock_cache_entry (&item);          else {
174                      else              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
175                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
176                  }          }
177                  EndDialog (dlg, TRUE);          center_window (dlg, NULL);
178                  return TRUE;          SetForegroundWindow (dlg);
179                            return FALSE;
180              case IDCANCEL:  
181                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );          case WM_SYSCOMMAND:
182                  c->cancel = 1;              if (LOWORD (wparam) == SC_CLOSE) {
183                  EndDialog (dlg, FALSE);                  c->cancel = 1;
184                  return FALSE;                  EndDialog (dlg, TRUE);
185              }              }
186              break;              break;
187      }  
188                case WM_COMMAND:
189      return FALSE;              switch (HIWORD (wparam)) {
190  }              case BN_CLICKED:
191                    if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
192                        || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
193  /* Extract the main keyid from @pass_info.                      HWND hwnd;
194     Return value: long main keyid or NULL for an error. */                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
195  static const char*                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
196  parse_gpg_keyid (const char *pass_info)                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
197  {                      SetFocus (hwnd);
198      static char keyid[16+1];                  }
199                    }
200      if (strlen (pass_info) < 16)  
201          return NULL;              switch (LOWORD (wparam)) {
202      /* the format of the desc buffer looks like this:              case IDOK:  
203         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                  /* XXX: the item is even cached when the passphrase is not
204         we use the main keyid to use only one cache entry. */                          correct, which means that the user needs to delete all
205      strncpy (keyid, pass_info+17, 16);                          cached entries to continue. */
206      keyid[16] = 0;                  if (c->pwd)
207      return keyid;                      burn_passphrase (&c->pwd);
208  }                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
209                    if (!n) {
210                        c->pwd = new char[2];
211  /* Parse the information in @uid_hint and @pass_info to generate                      if (!c->pwd)
212     a input message for the user in @desc. */                          BUG (NULL);
213  static void                      strcpy (c->pwd, "");
214  parse_gpg_description (const char *uid_hint, const char *pass_info,                  }
215                         char *desc, int size)                  else {
216  {                      char *p = new char[n+2];
217      gpgme_pubkey_algo_t algo;                      if (!p)
218      char usedkey[16+1], mainkey[16+1];                          BUG (NULL);
219      char *uid, *p;                      /* Get the passphrase and convert it utf8.
220      int n=0;                         This does not just the us-ascii charset. */
221                        SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), p, n+1);
222      while (p = strsep ((char**)&pass_info, " ")) {                      c->pwd = native_to_utf8 (p);
223          switch (n++) {                      sfree_if_alloc (p);
224          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;                  }
225          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;                  res = gpgme_op_decrypt_result (c->gpg);
226          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;                  if (!res)
227          }                      res_sig = gpgme_op_sign_result (c->gpg);            
228      }                  if (!c->is_card && reg_prefs.cache_time > 0 &&
229      uid_hint += 16; /* skip keyid */                      (res || res_sig)) {
230      uid_hint += 1;  /* space */                      if (agent_get_cache (c->keyid, &item))
231                            agent_unlock_cache_entry (&item);
232      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));                      else
233                            agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
234      if (strcmp (usedkey, mainkey))                  }
235          _snprintf (desc, size-1,                  c->cancel = 0;
236                     _("You need a passphrase to unlock the secret key for\n"                  EndDialog (dlg, TRUE);
237                       "user: \"%s\"\n"                  return TRUE;
238                       "%s key, ID %s (main key ID %s)\n"),                  
239                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);              case IDCANCEL:
240      else if (!strcmp (usedkey, mainkey))                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
241          _snprintf (desc, size-1,                  c->cancel = 1;
242                     _("You need a passphrase to unlock the secret key for\n"                  EndDialog (dlg, FALSE);
243                       "user: \"%s\"\n"                  return FALSE;
244                       "%s key, ID %s\n"),              }
245                       uid, get_key_pubalgo (algo), usedkey+8);              break;
246      free (uid);      }
247  }      
248        return FALSE;
249    }
250  static int inline  
251  is_hexstring (const char * p)  
252  {  /* Extract the main keyid from @pass_info.
253      size_t i;     Return value: long main keyid or NULL for an error. */
254    static const char*
255      for (i=0; i < strlen (p); i++) {  parse_gpg_keyid (const char *pass_info)
256          if (!isxdigit (p[i]))  {
257              return -1;      static char keyid[16+1];
258      }      
259      return 0;      /* XXX: check for leading alpha-chars? */
260  }      if (strlen (pass_info) < 16) {
261            log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
262            return NULL;
263  /* Passphrase callback with the ability to support caching. */      }
264  gpgme_error_t      /* the format of the desc buffer looks like this:
265  passphrase_cb (void *hook, const char *uid_hint,         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
266                 const char *passphrase_info,         we use the main keyid to use only one cache entry. */
267                 int prev_was_bad, int fd)      strncpy (keyid, pass_info+17, 16);
268  {      keyid[16] = 0;
269      passphrase_cb_s *c = (passphrase_cb_s*)hook;      return keyid;
270      HANDLE hd = (HANDLE)fd;  }
271      void *item;  
272      const char *keyid, *pass;  
273      DWORD n;  /* Parse the information in @uid_hint and @pass_info to generate
274      int rc;     a input message for the user in @desc. */
275    static int
276      /* XXX: pubkey_enc cancel does not quit gpg.exe */  parse_gpg_description (const char *uid_hint, const char *pass_info,
277      /* XXX: handle prev_was_bad case. */                         char *desc, int size)
278      if (!c)  {
279          return gpg_error (GPG_ERR_INV_ARG);      gpgme_pubkey_algo_t algo;
280        char usedkey[16+1];
281      if (passphrase_info) {      char mainkey[16+1];
282          keyid = parse_gpg_keyid (passphrase_info);      char *p, *uid;
283          pass = agent_get_cache (keyid+8, &item);      int n=0;
284          if (pass) {  
285              agent_unlock_cache_entry (&item);      algo = (gpgme_pubkey_algo_t)0;
286              c->pwd_init = 0;      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
287              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))      if (strlen (uid_hint) < 17) {
288                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);          *desc = 0;
289              if (!WriteFile (hd, "\n", 1, &n, NULL))          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
290                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);          return -1;
291              return 0;      }
292          }  
293      }      while (p = strsep ((char**)&pass_info, " ")) {
294            switch (n++) {
295      if (c->pwd_init) {          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
296          if (keyid && strlen (keyid) == 16)          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
297              strcpy (c->keyid, keyid+8);          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
298            }
299          /* if the desc has a length of 32 and only hex digits, we assume a      }
300             smart card has been used. */      uid_hint += 16; /* skip keyid */
301          if (uid_hint && strlen (uid_hint) == 32 && !is_hexstring (uid_hint)) {      uid_hint += 1;  /* space */
302              char buf[16];  
303              memset (buf, 0, sizeof buf);      uid = utf8_to_native (uid_hint);
304              strncpy (buf, uid_hint+20, 8);      if (strcmp (usedkey, mainkey))
305              _snprintf (c->info, sizeof c->info-1,          _snprintf (desc, size-1,
306                         _("Please enter the PIN to unlock your secret card key\n"                     _("You need a passphrase to unlock the secret key for user:\n"
307                           "Card: %s"), buf);                       "\"%s\"\n"
308              c->is_card = 1;                       "%s key, ID 0x%s (main key ID 0x%s)\n"),
309          }                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
310          else if (uid_hint)      else if (!strcmp (usedkey, mainkey))
311              parse_gpg_description (uid_hint, passphrase_info,          _snprintf (desc, size-1,
312                                     c->info, sizeof c->info - 1);                     _("You need a passphrase to unlock the secret key for user:\n"
313          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                       "\"%s\"\n"
314              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,                       "%s key, ID 0x%s\n"),
315                                   (HWND)c->hwnd, passphrase_callback_proc,                       uid, get_key_pubalgo (algo), usedkey+8);
316                                   (LPARAM)c);      safe_free (uid);
317          }      return 0;
318          else if (c->gpg_cmd == GPG_CMD_SIGN) {  }
319              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,  
320                                   (HWND)c->hwnd, passphrase_callback_proc,  
321                                   (LPARAM)c);  /* Extract the serial number from the card ID @id and return it. */
322          }  const char*
323          if (rc == -1) {  extract_serial_no (const char *id)
324              WriteFile (hd, "\n", 1, &n, NULL);  {
325              return gpg_error (GPG_ERR_EOF);      static char buf[8];
326          }      char *p;
327          c->pwd_init = 0;  
328      }      p = strchr (id, '/');
329      if (c->cancel) {      if (!p) {
330          WriteFile (hd, "\n", 1, &n, NULL);          log_debug ("extract_serial_no: error '%s'\r\n", id);
331          return gpg_error (GPG_ERR_EOF);          return NULL;
332      }      }
333        strncpy (buf, id+(p-id)-6, 6);
334      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);      return buf;
335      WriteFile (hd, "\n", 1, &n, NULL);  }
336      return 0;  
337  }  
338    /* Passphrase callback with the ability to support caching. */
339    gpgme_error_t
340  /* Initialize the given passphrase callback @cb with the  passphrase_cb (void *hook, const char *uid_hint,
341     used gpgme context @ctx, the command @cmd and a title                 const char *passphrase_info,
342     @title for the dialog. */                 int prev_was_bad, int fd)
343  void  {
344  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,      passphrase_cb_s *c = (passphrase_cb_s*)hook;
345                         int cmd, HWND hwnd, const char *title)      HANDLE hd = (HANDLE)fd;
346  {      void *item;
347      memset (cb, 0, sizeof *cb);      const char *keyid=NULL, *pass;
348      cb->gpg_cmd = cmd;      DWORD n;
349      cb->is_card = 0;      int rc = 0;
350      cb->cancel = 0;  
351      cb->hwnd = hwnd;      if (!c) {
352      cb->pwd_init = 1;          log_debug ("passphrase_cb: error '!c'\r\n");
353      free_if_alloc (cb->title);          return gpg_error (GPG_ERR_INV_ARG);
354      cb->title = m_strdup (title);      }
355      if (!cb->title)      c->bad_pwd = prev_was_bad? 1 : 0;
356          BUG (NULL);      if (prev_was_bad && !c->cancel) {
357      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);          if (c->pwd)
358      cb->gpg = ctx;              burn_passphrase (&c->pwd);
359  }          agent_del_cache (c->keyid);
360            c->pwd_init = 1;
361        }
362  /* Release a passphrase callback @ctx. */  
363  void      if (passphrase_info) {
364  release_gpg_passphrase_cb (passphrase_cb_s *ctx)          if (strlen (passphrase_info) < 16 &&
365  {              !strstr (passphrase_info, "OPENPGP")) {
366      if (!ctx)              /* assume symetric encryption. */
367          return;              int pos=2;
368      sfree_if_alloc (ctx->pwd);              c->sym.sym_algo = atoi (passphrase_info);
369      free_if_alloc (ctx->title);              if (c->sym.sym_algo > 9)
370  }                  pos++;
371                /* XXX: be more strict. */
372  /* Simple check to measure passphrase (@pass) quality.              c->sym.s2k_mode = atoi (passphrase_info+pos);
373     Return value: 0 on success. */              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
374  int          }
375  check_passwd_quality (const char *pass, int strict)  
376  {          keyid = parse_gpg_keyid (passphrase_info);
377      int i, nd=0, nc=0, n;          pass = agent_get_cache (keyid+8, &item);        
378            if (pass) {
379      n = strlen (pass);              agent_unlock_cache_entry (&item);
380      if (n < 8)              c->pwd_init = 0;
381          return -1;              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
382                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
383      for (i=0; i < n; i++) {              if (!WriteFile (hd, "\n", 1, &n, NULL))
384          if (isdigit (pass[i])) nd++;                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
385          if (isalpha (pass[i])) nc++;              return 0;
386      }          }
387        }
388      if (nd == n || nc == n)  
389          return -1;      if (c->pwd_init) {
390            if (keyid && strlen (keyid) == 16)
391      return 0;              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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