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

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revision 25 by twoaday, Wed Oct 12 10:04:26 2005 UTC revision 48 by werner, Mon Oct 31 21:14:11 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    
45  #define item_ctrl_id2(cmd) \  
46      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)  const char* get_symkey_algo (int algo);
47    
48    #define item_ctrl_id( cmd ) \
49  /* Dialog procedure for the passphrase callback. */      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
50  static BOOL CALLBACK  
51  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)  #define item_ctrl_id2(cmd) \
52  {          ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
53      static passphrase_cb_s * c;  
54      gpgme_decrypt_result_t res;  
55      gpgme_sign_result_t res_sig;  /* Overwrite passphrase and free memory. */
56      gpgme_key_t key;  static void
57      void *ctx = NULL, *item;  burn_passphrase (char **pwd)
58      const char *id;  {
59      char *info;      char *pass = *pwd;
60      int n;      wipememory (pass, strlen (pass));
61        delete []pass;
62      switch (msg) {      *pwd = NULL;
63      case WM_INITDIALOG:  }
64          c = (passphrase_cb_s *)lparam;  
65          if (!c)  
66              BUG (0);  /* Dialog procedure for the passphrase callback. */
67          SetWindowText (dlg, c->title);  static BOOL CALLBACK
68          if (c->gpg_cmd == GPG_CMD_DECRYPT) {  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
69              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,  {    
70                  _("Encrypted with the following public key(s)") );      static passphrase_cb_s * c;
71              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );      gpgme_decrypt_result_t res;
72          }      gpgme_sign_result_t res_sig;
73          else if (c->gpg_cmd == GPG_CMD_SIGN)      gpgme_key_t key;
74              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);      gpgme_recipient_t recip, r;
75          res = gpgme_op_decrypt_result (c->gpg);      void *ctx = NULL, *item;
76          if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {      const char *id;
77              gpgme_recipient_t r;      char *info;
78        int n;
79              /* XXX: not all ENCRYPT_TO entries are listed here. */  
80              for (r = res->recipients; r; r = r->next) {      switch (msg) {
81                  get_pubkey (r->keyid, &key);      case WM_INITDIALOG:
82                  if (key) {          c = (passphrase_cb_s *)lparam;
83                      char *uid;          if (!c)
84                      id = key->uids->name;              BUG (0);
85                      if (!id)          SetWindowText (dlg, c->title);
86                          id = _("Invalid User ID");          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
87                      uid = utf8_to_wincp (id, strlen (id));              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
88                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1                              _("Encrypted with the following public key(s)"));
89                                       + strlen (key->uids->email)+1];              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
90                      if (!info)          }
91                          BUG (NULL);          else if (c->gpg_cmd == GPG_CMD_SIGN)
92                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
93                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);          if (c->recipients)
94                      free (uid);              recip = c->recipients; /* recipients were already extracted. */
95                                else {
96                  }              /* XXX: not all ENCRYPT_TO entries are listed here. */
97                  else {              res = gpgme_op_decrypt_result (c->gpg);
98                      info = new char [32 + strlen (r->keyid)+1 + 4];              if (res && res->recipients)
99                      if (!info)                  recip = res->recipients;
100                          BUG (NULL);          }
101                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
102                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);              for (r = res->recipients; r; r = r->next) {
103                  }                  get_pubkey (r->keyid, &key);
104                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);                  if (key) {
105                  free_if_alloc (info);                      char *uid;
106              }                      id = key->uids->name;
107          }                      if (!id)
108          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                          id = _("Invalid User ID");
109              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);                      uid = utf8_to_wincp (id, strlen (id));
110          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1
111                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                                       + strlen (key->uids->email)+1];
112                          _("Please enter your passphrase"));                      if (!info)
113          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                          BUG (NULL);
114              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,
115              if (res && !res->recipients) {                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
116                  const char *s = _("Symmetric encryption.\n"                      free (uid);
117                                    "%s encrypted data.");                      
118                  const char *alg = get_symkey_algo (c->sym.sym_algo);                  }
119                  info = new char[strlen (s) + strlen (alg) + 2];                  else {
120                  if (!info)                      info = new char [32 + strlen (r->keyid)+1 + 4];
121                      BUG (NULL);                      if (!info)
122                  sprintf (info, s, alg);                          BUG (NULL);
123                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
124                  free_if_alloc (info);                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
125              }                  }
126              else                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
127                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                  free_if_alloc (info);
128          }              }
129          else {          }
130              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
131              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
132          }          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
133          center_window (dlg, NULL);                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
134          SetForegroundWindow (dlg);                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
135          set_active_window (dlg);                          _("Please enter your passphrase"));
136          return FALSE;          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
137                SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
138          case WM_SYSCOMMAND:              if (res && !res->recipients) {
139              if( LOWORD( wparam ) == SC_CLOSE ) {                  const char *s = _("Symmetric encryption.\n"
140                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );                                    "%s encrypted data.");
141                  c->cancel = 1;                  const char *alg = get_symkey_algo (c->sym.sym_algo);
142                  EndDialog( dlg, TRUE );                  info = new char[strlen (s) + strlen (alg) + 2];
143              }                  if (!info)
144              break;                      BUG (NULL);
145                    sprintf (info, s, alg);
146          case WM_COMMAND:                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
147              switch( HIWORD( wparam ) ) {                  free_if_alloc (info);
148              case BN_CLICKED:              }
149                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE              else
150                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
151                      HWND hwnd;          }
152                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));          else {
153                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
154                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
155                      SetFocus (hwnd);          }
156                  }          center_window (dlg, NULL);
157              }          SetForegroundWindow (dlg);
158            set_active_window (dlg);
159              switch (LOWORD (wparam)) {          return FALSE;
160              case IDOK:    
161                  /* fixme: the item is even cached when the passphrase is not          case WM_SYSCOMMAND:
162                            correct, which means that the user needs to delete all              if (LOWORD (wparam) == SC_CLOSE) {
163                            cached entries to continue. */                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
164                  if (c->pwd) {                  c->cancel = 1;
165                      delete []c->pwd;                  EndDialog (dlg, TRUE);
166                      c->pwd = NULL;              }
167                  }              break;
168                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));  
169                  if (!n) {          case WM_COMMAND:
170                      c->pwd = new char[2];              switch (HIWORD (wparam)) {
171                      strcpy (c->pwd, "");              case BN_CLICKED:
172                  }                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
173                  else {                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
174                      c->pwd = new char[n+2];                      HWND hwnd;
175                      if (!c->pwd)                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
176                          BUG (NULL);                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
177                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
178                  }                      SetFocus (hwnd);
179                  res = gpgme_op_decrypt_result (c->gpg);                  }
180                  if (!res)              }
181                      res_sig = gpgme_op_sign_result (c->gpg);  
182                  if (reg_prefs.cache_time > 0 && !c->is_card &&              switch (LOWORD (wparam)) {
183                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {              case IDOK:  
184                      if (agent_get_cache (c->keyid, &item))                  /* XXX: the item is even cached when the passphrase is not
185                          agent_unlock_cache_entry (&item);                          correct, which means that the user needs to delete all
186                      else                          cached entries to continue. */
187                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                  if (c->pwd)
188                  }                      burn_passphrase (&c->pwd);
189                  EndDialog (dlg, TRUE);                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
190                  return TRUE;                  if (!n) {
191                                        c->pwd = new char[2];
192              case IDCANCEL:                      if (!c->pwd)
193                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                          BUG (NULL);
194                  c->cancel = 1;                      strcpy (c->pwd, "");
195                  EndDialog (dlg, FALSE);                  }
196                  return FALSE;                  else {
197              }                      c->pwd = new char[n+2];
198              break;                      if (!c->pwd)
199      }                          BUG (NULL);
200                            GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
201      return FALSE;                  }
202  }                  res = gpgme_op_decrypt_result (c->gpg);
203                    if (!res)
204                        res_sig = gpgme_op_sign_result (c->gpg);
205  /* Extract the main keyid from @pass_info.                  if (reg_prefs.cache_time > 0 && !c->is_card &&
206     Return value: long main keyid or NULL for an error. */                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {
207  static const char*                      if (agent_get_cache (c->keyid, &item))
208  parse_gpg_keyid (const char *pass_info)                          agent_unlock_cache_entry (&item);
209  {                      else
210      static char keyid[16+1];                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
211                        }
212      if (strlen (pass_info) < 16)                  c->cancel = 0;
213          return NULL;                  EndDialog (dlg, TRUE);
214      /* the format of the desc buffer looks like this:                  return TRUE;
215         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                  
216         we use the main keyid to use only one cache entry. */              case IDCANCEL:
217      strncpy (keyid, pass_info+17, 16);                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
218      keyid[16] = 0;                  c->cancel = 1;
219      return keyid;                  EndDialog (dlg, FALSE);
220  }                  return FALSE;
221                }
222                break;
223  /* Parse the information in @uid_hint and @pass_info to generate      }
224     a input message for the user in @desc. */      
225  static void      return FALSE;
226  parse_gpg_description (const char *uid_hint, const char *pass_info,  }
227                         char *desc, int size)  
228  {  
229      gpgme_pubkey_algo_t algo;  /* Extract the main keyid from @pass_info.
230      char usedkey[16+1], mainkey[16+1];     Return value: long main keyid or NULL for an error. */
231      char *uid, *p;  static const char*
232      int n=0;  parse_gpg_keyid (const char *pass_info)
233    {
234      while (p = strsep ((char**)&pass_info, " ")) {      static char keyid[16+1];
235          switch (n++) {      
236          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;      /* XXX: check for leading alpha-chars? */
237          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;      if (strlen (pass_info) < 16)
238          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;          return NULL;
239          }      /* the format of the desc buffer looks like this:
240      }         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
241      uid_hint += 16; /* skip keyid */         we use the main keyid to use only one cache entry. */
242      uid_hint += 1;  /* space */      strncpy (keyid, pass_info+17, 16);
243        keyid[16] = 0;
244      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));      return keyid;
245    }
246      if (strcmp (usedkey, mainkey))  
247          _snprintf (desc, size-1,  
248                     _("You need a passphrase to unlock the secret key for\n"  /* Parse the information in @uid_hint and @pass_info to generate
249                       "user: \"%s\"\n"     a input message for the user in @desc. */
250                       "%s key, ID %s (main key ID %s)\n"),  static int
251                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);  parse_gpg_description (const char *uid_hint, const char *pass_info,
252      else if (!strcmp (usedkey, mainkey))                         char *desc, int size)
253          _snprintf (desc, size-1,  {
254                     _("You need a passphrase to unlock the secret key for\n"      gpgme_pubkey_algo_t algo;
255                       "user: \"%s\"\n"      char usedkey[16+1];
256                       "%s key, ID %s\n"),      char mainkey[16+1];
257                       uid, get_key_pubalgo (algo), usedkey+8);      char *uid, *p;
258      free (uid);      int n=0;
259  }  
260        /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
261        if (strlen (uid_hint) < 17) {
262  static int inline          *desc = 0;
263  is_hexstring (const char * p)          return -1;
264  {      }
265      size_t i;  
266        while (p = strsep ((char**)&pass_info, " ")) {
267      for (i=0; i < strlen (p); i++) {          switch (n++) {
268          if (!isxdigit (p[i]))          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
269              return -1;          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
270      }          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
271      return 0;          }
272  }      }
273        uid_hint += 16; /* skip keyid */
274        uid_hint += 1;  /* space */
275  /* Passphrase callback with the ability to support caching. */  
276  gpgme_error_t      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
277  passphrase_cb (void *hook, const char *uid_hint,  
278                 const char *passphrase_info,      if (strcmp (usedkey, mainkey))
279                 int prev_was_bad, int fd)          _snprintf (desc, size-1,
280  {                     _("You need a passphrase to unlock the secret key for\n"
281      passphrase_cb_s *c = (passphrase_cb_s*)hook;                       "user: \"%s\"\n"
282      HANDLE hd = (HANDLE)fd;                       "%s key, ID %s (main key ID %s)\n"),
283      void *item;                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
284      const char *keyid, *pass;      else if (!strcmp (usedkey, mainkey))
285      DWORD n;          _snprintf (desc, size-1,
286      int rc;                     _("You need a passphrase to unlock the secret key for\n"
287                         "user: \"%s\"\n"
288      /* XXX: pubkey_enc cancel does not quit gpg.exe */                       "%s key, ID %s\n"),
289      /* XXX: handle prev_was_bad case. */                       uid, get_key_pubalgo (algo), usedkey+8);
290      if (!c)      free (uid);
291          return gpg_error (GPG_ERR_INV_ARG);      return 0;
292    }
293      if (passphrase_info) {  
294          if (strlen (passphrase_info) < 16) {/* assume symetric encryption. */  
295              int n=2;  /* Extract the serial number from the card ID @id and return it. */
296              c->sym.sym_algo = atoi (passphrase_info);  const char*
297              if (c->sym.sym_algo > 9)  extract_serial_no (const char *id)
298                  n++;  {
299              /* XXX: be more strict. */      static char buf[8];
300              c->sym.s2k_mode = atoi (passphrase_info+n);      char *p;
301              c->sym.s2k_hash = atoi (passphrase_info+n+2);  
302          }      p = strchr (id, '/');
303        if (!p)
304          keyid = parse_gpg_keyid (passphrase_info);          return NULL;
305          pass = agent_get_cache (keyid+8, &item);      strncpy (buf, id+(p-id)-6, 6);
306          if (pass) {      return buf;
307              agent_unlock_cache_entry (&item);  }
308              c->pwd_init = 0;  
309              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))  
310                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);  /* Passphrase callback with the ability to support caching. */
311              if (!WriteFile (hd, "\n", 1, &n, NULL))  gpgme_error_t
312                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);  passphrase_cb (void *hook, const char *uid_hint,
313              return 0;                 const char *passphrase_info,
314          }                 int prev_was_bad, int fd)
315      }  {
316        passphrase_cb_s *c = (passphrase_cb_s*)hook;
317      if (c->pwd_init) {      HANDLE hd = (HANDLE)fd;
318          if (keyid && strlen (keyid) == 16)      void *item;
319              strcpy (c->keyid, keyid+8);      const char *keyid, *pass;
320        DWORD n;
321          /* if the desc has a length of 32 and only hex digits, we assume a      int rc;
322             smart card has been used. */  
323          if (uid_hint && strlen (uid_hint) == 32 && !is_hexstring (uid_hint)) {      if (!c)
324              char buf[16];          return gpg_error (GPG_ERR_INV_ARG);
325              memset (buf, 0, sizeof buf);      c->bad_pwd = prev_was_bad? 1 : 0;
326              strncpy (buf, uid_hint+20, 8);      if (prev_was_bad && !c->cancel) {
327              _snprintf (c->info, sizeof c->info-1,          if (c->pwd)
328                         _("Please enter the PIN to unlock your secret card key\n"              burn_passphrase (&c->pwd);
329                           "Card: %s"), buf);          agent_del_cache (c->keyid);
330              c->is_card = 1;          c->pwd_init = 1;
331          }      }
332          else if (uid_hint)  
333              parse_gpg_description (uid_hint, passphrase_info,      if (passphrase_info) {
334                                     c->info, sizeof c->info - 1);          if (strlen (passphrase_info) < 16 &&
335          if (c->gpg_cmd == GPG_CMD_DECRYPT) {              !strstr (passphrase_info, "OPENPGP")) {
336              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,              /* assume symetric encryption. */
337                                   (HWND)c->hwnd, passphrase_callback_proc,              int n=2;
338                                   (LPARAM)c);              c->sym.sym_algo = atoi (passphrase_info);
339          }              if (c->sym.sym_algo > 9)
340          else if (c->gpg_cmd == GPG_CMD_SIGN) {                  n++;
341              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,              /* XXX: be more strict. */
342                                   (HWND)c->hwnd, passphrase_callback_proc,              c->sym.s2k_mode = atoi (passphrase_info+n);
343                                   (LPARAM)c);              c->sym.s2k_hash = atoi (passphrase_info+n+2);
344          }          }
345          if (rc == -1) {  
346              WriteFile (hd, "\n", 1, &n, NULL);          keyid = parse_gpg_keyid (passphrase_info);
347              return gpg_error (GPG_ERR_EOF);          pass = agent_get_cache (keyid+8, &item);
348          }          if (pass) {
349          c->pwd_init = 0;              agent_unlock_cache_entry (&item);
350      }              c->pwd_init = 0;
351      if (c->cancel) {              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
352          WriteFile (hd, "\n", 1, &n, NULL);                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
353          return gpg_error (GPG_ERR_EOF);              if (!WriteFile (hd, "\n", 1, &n, NULL))
354      }                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
355                return 0;
356      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);          }
357      WriteFile (hd, "\n", 1, &n, NULL);      }
358      return 0;  
359  }      if (c->pwd_init) {
360            if (keyid && strlen (keyid) == 16)
361                strcpy (c->keyid, keyid+8);
362  /* Initialize the given passphrase callback @cb with the  
363     used gpgme context @ctx, the command @cmd and a title          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
364     @title for the dialog. */              has been used. */
365  void          if (strstr (passphrase_info, "OPENPGP")) {
366  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,              const char *s=passphrase_info;
367                         int cmd, HWND hwnd, const char *title)              while (s && *s && *s != 'D')
368  {                  s++;
369      memset (cb, 0, sizeof *cb);              _snprintf (c->info, sizeof c->info-1,
370      cb->gpg_cmd = cmd;                         _("Please enter the PIN to unlock your secret card key\n"
371      cb->is_card = 0;                           "Card: %s"), extract_serial_no (s));
372      cb->cancel = 0;              c->is_card = 1;
373      cb->hwnd = hwnd;          }
374      cb->pwd_init = 1;          else if (uid_hint)
375      free_if_alloc (cb->title);              parse_gpg_description (uid_hint, passphrase_info,
376      cb->title = m_strdup (title);                                     c->info, sizeof c->info - 1);
377      if (!cb->title)          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
378          BUG (NULL);              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
379      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);                                   (HWND)c->hwnd, passphrase_callback_proc,
380      cb->gpg = ctx;                                   (LPARAM)c);
381  }          }
382            else if (c->gpg_cmd == GPG_CMD_SIGN) {
383                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
384  /* Release a passphrase callback @ctx. */                                   (HWND)c->hwnd, passphrase_callback_proc,
385  void                                   (LPARAM)c);
386  release_gpg_passphrase_cb (passphrase_cb_s *ctx)          }
387  {          if (rc == -1) {
388      if (!ctx)              if (!WriteFile (hd, "\n", 1, &n, NULL))
389          return;                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
390      sfree_if_alloc (ctx->pwd);              return 0;
391      free_if_alloc (ctx->title);          }
392  }          c->pwd_init = 0;
393        }
394  /* Simple check to measure passphrase (@pass) quality.      if (c->cancel) {
395     Return value: 0 on success. */          if (!WriteFile (hd, "\n", 1, &n, NULL))
396  int              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
397  check_passwd_quality (const char *pass, int strict)          return 0;
398  {      }
399      int i, nd=0, nc=0, n;  
400        WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);
401      n = strlen (pass);      WriteFile (hd, "\n", 1, &n, NULL);
402      if (n < 8)      return 0;
403          return -1;  }
404    
405      for (i=0; i < n; i++) {  
406          if (isdigit (pass[i])) nd++;  /* Initialize the given passphrase callback @cb with the
407          if (isalpha (pass[i])) nc++;     used gpgme context @ctx, the command @cmd and a title
408      }     @title for the dialog. */
409    void
410      if (nd == n || nc == n)  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
411          return -1;                         int cmd, HWND hwnd, const char *title)
412    {
413      return 0;      memset (cb, 0, sizeof *cb);
414  }      cb->gpg_cmd = cmd;
415        cb->bad_pwd = 0;
416        cb->is_card = 0;
417        cb->cancel = 0;
418        cb->hwnd = hwnd;
419        cb->pwd_init = 1;
420        free_if_alloc (cb->title);
421        cb->title = m_strdup (title);
422        if (!cb->title)
423            BUG (NULL);
424        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
425        cb->gpg = ctx;
426    }
427    
428    
429    /* Release a passphrase callback @ctx. */
430    void
431    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
432    {
433        gpgme_recipient_t r, n;
434    
435        if (!ctx)
436            return;
437        sfree_if_alloc (ctx->pwd);
438        free_if_alloc (ctx->title);
439        r = ctx->recipients;
440        while (r) {
441            n = r->next;
442            safe_free (r->keyid);
443            safe_free (r);
444            r = n;
445        }
446    }
447    
448    
449    /* Simple check to measure passphrase (@pass) quality.
450       Return value: 0 on success. */
451    int
452    check_passwd_quality (const char *pass, int strict)
453    {
454        int i, nd=0, nc=0, n;
455    
456        n = strlen (pass);
457        if (n < 8)
458            return -1;
459    
460        for (i=0; i < n; i++) {
461            if (isdigit (pass[i]))
462                nd++;
463            if (isalpha (pass[i]))
464                nc++;
465        }
466    
467        /* check that the passphrase contains letters and numbers. */
468        if (nd == n || nc == n)
469            return -1;
470    
471        return 0;
472    }

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