/[winpt]/trunk/Src/wptPassphraseCB.cpp
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revision 25 by twoaday, Wed Oct 12 10:04:26 2005 UTC revision 95 by twoaday, Thu Nov 24 12:09:28 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  /* Dialog procedure for the passphrase callback. */  #define item_ctrl_id2(cmd) \
50  static BOOL CALLBACK      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
51  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)  
52  {      
53      static passphrase_cb_s * c;  /* Overwrite passphrase and free memory. */
54      gpgme_decrypt_result_t res;  static void
55      gpgme_sign_result_t res_sig;  burn_passphrase (char **pwd)
56      gpgme_key_t key;  {
57      void *ctx = NULL, *item;      char *pass = *pwd;
58      const char *id;      wipememory (pass, strlen (pass));
59      char *info;      delete []pass;
60      int n;      *pwd = NULL;
61    }
62      switch (msg) {  
63      case WM_INITDIALOG:  
64          c = (passphrase_cb_s *)lparam;  /* Dialog procedure for the passphrase callback. */
65          if (!c)  static BOOL CALLBACK
66              BUG (0);  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
67          SetWindowText (dlg, c->title);  {    
68          if (c->gpg_cmd == GPG_CMD_DECRYPT) {      static passphrase_cb_s *c;
69              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,      gpgme_decrypt_result_t res=NULL;
70                  _("Encrypted with the following public key(s)") );      gpgme_sign_result_t res_sig=NULL;
71              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );      gpgme_key_t key;
72          }      gpgme_recipient_t recip=NULL, r;
73          else if (c->gpg_cmd == GPG_CMD_SIGN)      void *item;
74              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);      const char *id;
75          res = gpgme_op_decrypt_result (c->gpg);      char *info;
76          if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {      int n;
77              gpgme_recipient_t r;  
78        switch (msg) {
79              /* XXX: not all ENCRYPT_TO entries are listed here. */      case WM_INITDIALOG:
80              for (r = res->recipients; r; r = r->next) {          c = (passphrase_cb_s *)lparam;
81                  get_pubkey (r->keyid, &key);          if (!c)
82                  if (key) {              BUG (0);
83                      char *uid;          SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
84                      id = key->uids->name;          SetWindowText (dlg, c->title);
85                      if (!id)          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
86                          id = _("Invalid User ID");              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
87                      uid = utf8_to_wincp (id, strlen (id));                              _("Encrypted with the following public key(s)"));
88                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
89                                       + strlen (key->uids->email)+1];          }
90                      if (!info)          else if (c->gpg_cmd == GPG_CMD_SIGN) {
91                          BUG (NULL);              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
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);          }
94                      free (uid);          if (c->recipients)
95                                    recip = c->recipients; /* recipients were already extracted. */
96                  }          else {
97                  else {              /* XXX: not all ENCRYPT_TO entries are listed here. */
98                      info = new char [32 + strlen (r->keyid)+1 + 4];              res = gpgme_op_decrypt_result (c->gpg);
99                      if (!info)              if (res && res->recipients)
100                          BUG (NULL);                  recip = res->recipients;
101                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),          }
102                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
103                  }              for (r = res->recipients; r; r = r->next) {
104                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);                  get_pubkey (r->keyid, &key);
105                  free_if_alloc (info);                  if (key) {
106              }                      char *uid;
107          }                      id = key->uids->name;
108          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                      if (!id)
109              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);                          id = _("Invalid User ID");
110          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?                      uid = utf8_to_wincp (id, strlen (id));
111                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1
112                          _("Please enter your passphrase"));                                       + strlen (key->uids->email)+1];
113          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                      if (!info)
114              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));                          BUG (NULL);
115              if (res && !res->recipients) {                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,
116                  const char *s = _("Symmetric encryption.\n"                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
117                                    "%s encrypted data.");                      free (uid);
118                  const char *alg = get_symkey_algo (c->sym.sym_algo);                      
119                  info = new char[strlen (s) + strlen (alg) + 2];                  }
120                  if (!info)                  else {
121                      BUG (NULL);                      info = new char [32 + strlen (r->keyid)+1 + 4];
122                  sprintf (info, s, alg);                      if (!info)
123                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);                          BUG (NULL);
124                  free_if_alloc (info);                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
125              }                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
126              else                  }
127                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
128          }                  free_if_alloc (info);
129          else {              }
130              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));          }
131              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
132          }              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
133          center_window (dlg, NULL);          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
134          SetForegroundWindow (dlg);                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
135          set_active_window (dlg);                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
136          return FALSE;                          _("Please enter your passphrase"));
137            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
138          case WM_SYSCOMMAND:              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
139              if( LOWORD( wparam ) == SC_CLOSE ) {              if (res && !res->recipients) {
140                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );                  const char *s = _("Symmetric encryption.\n"
141                  c->cancel = 1;                                    "%s encrypted data.");
142                  EndDialog( dlg, TRUE );                  const char *alg = get_symkey_algo (c->sym.sym_algo);
143              }                  info = new char[strlen (s) + strlen (alg) + 2];
144              break;                  if (!info)
145                        BUG (NULL);
146          case WM_COMMAND:                  sprintf (info, s, alg);
147              switch( HIWORD( wparam ) ) {                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
148              case BN_CLICKED:                  free_if_alloc (info);
149                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE              }
150                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {              else
151                      HWND hwnd;                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
152                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));          }
153                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));          else {
154                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
155                      SetFocus (hwnd);              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
156                  }          }
157              }          center_window (dlg, NULL);
158            SetForegroundWindow (dlg);
159              switch (LOWORD (wparam)) {          set_active_window (dlg);
160              case IDOK:            return FALSE;
161                  /* fixme: the item is even cached when the passphrase is not  
162                            correct, which means that the user needs to delete all          case WM_SYSCOMMAND:
163                            cached entries to continue. */              if (LOWORD (wparam) == SC_CLOSE) {
164                  if (c->pwd) {                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
165                      delete []c->pwd;                  c->cancel = 1;
166                      c->pwd = NULL;                  EndDialog (dlg, TRUE);
167                  }              }
168                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));              break;
169                  if (!n) {  
170                      c->pwd = new char[2];          case WM_COMMAND:
171                      strcpy (c->pwd, "");              switch (HIWORD (wparam)) {
172                  }              case BN_CLICKED:
173                  else {                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
174                      c->pwd = new char[n+2];                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
175                      if (!c->pwd)                      HWND hwnd;
176                          BUG (NULL);                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
177                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
178                  }                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
179                  res = gpgme_op_decrypt_result (c->gpg);                      SetFocus (hwnd);
180                  if (!res)                  }
181                      res_sig = gpgme_op_sign_result (c->gpg);              }
182                  if (reg_prefs.cache_time > 0 && !c->is_card &&  
183                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {              switch (LOWORD (wparam)) {
184                      if (agent_get_cache (c->keyid, &item))              case IDOK:  
185                          agent_unlock_cache_entry (&item);                  /* XXX: the item is even cached when the passphrase is not
186                      else                          correct, which means that the user needs to delete all
187                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                          cached entries to continue. */
188                  }                  if (c->pwd)
189                  EndDialog (dlg, TRUE);                      burn_passphrase (&c->pwd);
190                  return TRUE;                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
191                                    if (!n) {
192              case IDCANCEL:                      c->pwd = new char[2];
193                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                      if (!c->pwd)
194                  c->cancel = 1;                          BUG (NULL);
195                  EndDialog (dlg, FALSE);                      strcpy (c->pwd, "");
196                  return FALSE;                  }
197              }                  else {
198              break;                      c->pwd = new char[n+2];
199      }                      if (!c->pwd)
200                                BUG (NULL);
201      return FALSE;                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
202  }                  }
203                    res = gpgme_op_decrypt_result (c->gpg);
204                    if (!res)
205  /* Extract the main keyid from @pass_info.                      res_sig = gpgme_op_sign_result (c->gpg);            
206     Return value: long main keyid or NULL for an error. */                  if (reg_prefs.cache_time > 0 && !c->is_card &&
207  static const char*                      (res || res_sig)) {
208  parse_gpg_keyid (const char *pass_info)                      if (agent_get_cache (c->keyid, &item))                      
209  {                          agent_unlock_cache_entry (&item);
210      static char keyid[16+1];                      else
211                                agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
212      if (strlen (pass_info) < 16)                  }
213          return NULL;                  c->cancel = 0;
214      /* the format of the desc buffer looks like this:                  EndDialog (dlg, TRUE);
215         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                  return TRUE;
216         we use the main keyid to use only one cache entry. */                  
217      strncpy (keyid, pass_info+17, 16);              case IDCANCEL:
218      keyid[16] = 0;                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
219      return keyid;                  c->cancel = 1;
220  }                  EndDialog (dlg, FALSE);
221                    return FALSE;
222                }
223  /* Parse the information in @uid_hint and @pass_info to generate              break;
224     a input message for the user in @desc. */      }
225  static void      
226  parse_gpg_description (const char *uid_hint, const char *pass_info,      return FALSE;
227                         char *desc, int size)  }
228  {  
229      gpgme_pubkey_algo_t algo;  
230      char usedkey[16+1], mainkey[16+1];  /* Extract the main keyid from @pass_info.
231      char *uid, *p;     Return value: long main keyid or NULL for an error. */
232      int n=0;  static const char*
233    parse_gpg_keyid (const char *pass_info)
234      while (p = strsep ((char**)&pass_info, " ")) {  {
235          switch (n++) {      static char keyid[16+1];
236          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;      
237          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;      /* XXX: check for leading alpha-chars? */
238          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;      if (strlen (pass_info) < 16) {
239          }          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
240      }          return NULL;
241      uid_hint += 16; /* skip keyid */      }
242      uid_hint += 1;  /* space */      /* the format of the desc buffer looks like this:
243           request_keyid[16] main_keyid[16] keytype[1] keylength[4]
244      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));         we use the main keyid to use only one cache entry. */
245        strncpy (keyid, pass_info+17, 16);
246      if (strcmp (usedkey, mainkey))      keyid[16] = 0;
247          _snprintf (desc, size-1,      return keyid;
248                     _("You need a passphrase to unlock the secret key for\n"  }
249                       "user: \"%s\"\n"  
250                       "%s key, ID %s (main key ID %s)\n"),  
251                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);  /* Parse the information in @uid_hint and @pass_info to generate
252      else if (!strcmp (usedkey, mainkey))     a input message for the user in @desc. */
253          _snprintf (desc, size-1,  static int
254                     _("You need a passphrase to unlock the secret key for\n"  parse_gpg_description (const char *uid_hint, const char *pass_info,
255                       "user: \"%s\"\n"                         char *desc, int size)
256                       "%s key, ID %s\n"),  {
257                       uid, get_key_pubalgo (algo), usedkey+8);      gpgme_pubkey_algo_t algo;
258      free (uid);      char usedkey[16+1];
259  }      char mainkey[16+1];
260        char *uid, *p;
261        int n=0;
262  static int inline  
263  is_hexstring (const char * p)      algo = (gpgme_pubkey_algo_t)0;
264  {      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
265      size_t i;      if (strlen (uid_hint) < 17) {
266            *desc = 0;
267      for (i=0; i < strlen (p); i++) {          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
268          if (!isxdigit (p[i]))          return -1;
269              return -1;      }
270      }  
271      return 0;      while (p = strsep ((char**)&pass_info, " ")) {
272  }          switch (n++) {
273            case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
274            case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
275  /* Passphrase callback with the ability to support caching. */          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
276  gpgme_error_t          }
277  passphrase_cb (void *hook, const char *uid_hint,      }
278                 const char *passphrase_info,      uid_hint += 16; /* skip keyid */
279                 int prev_was_bad, int fd)      uid_hint += 1;  /* space */
280  {  
281      passphrase_cb_s *c = (passphrase_cb_s*)hook;      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
282      HANDLE hd = (HANDLE)fd;  
283      void *item;      if (strcmp (usedkey, mainkey))
284      const char *keyid, *pass;          _snprintf (desc, size-1,
285      DWORD n;                     _("You need a passphrase to unlock the secret key for\n"
286      int rc;                       "user: \"%s\"\n"
287                         "%s key, ID %s (main key ID %s)\n"),
288      /* XXX: pubkey_enc cancel does not quit gpg.exe */                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
289      /* XXX: handle prev_was_bad case. */      else if (!strcmp (usedkey, mainkey))
290      if (!c)          _snprintf (desc, size-1,
291          return gpg_error (GPG_ERR_INV_ARG);                     _("You need a passphrase to unlock the secret key for\n"
292                         "user: \"%s\"\n"
293      if (passphrase_info) {                       "%s key, ID %s\n"),
294          if (strlen (passphrase_info) < 16) {/* assume symetric encryption. */                       uid, get_key_pubalgo (algo), usedkey+8);
295              int n=2;      free (uid);
296              c->sym.sym_algo = atoi (passphrase_info);      return 0;
297              if (c->sym.sym_algo > 9)  }
298                  n++;  
299              /* XXX: be more strict. */  
300              c->sym.s2k_mode = atoi (passphrase_info+n);  /* Extract the serial number from the card ID @id and return it. */
301              c->sym.s2k_hash = atoi (passphrase_info+n+2);  const char*
302          }  extract_serial_no (const char *id)
303    {
304          keyid = parse_gpg_keyid (passphrase_info);      static char buf[8];
305          pass = agent_get_cache (keyid+8, &item);      char *p;
306          if (pass) {  
307              agent_unlock_cache_entry (&item);      p = strchr (id, '/');
308              c->pwd_init = 0;      if (!p) {
309              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))          log_debug ("extract_serial_no: error '%s'\r\n", id);
310                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);          return NULL;
311              if (!WriteFile (hd, "\n", 1, &n, NULL))      }
312                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);      strncpy (buf, id+(p-id)-6, 6);
313              return 0;      return buf;
314          }  }
315      }  
316    
317      if (c->pwd_init) {  /* Passphrase callback with the ability to support caching. */
318          if (keyid && strlen (keyid) == 16)  gpgme_error_t
319              strcpy (c->keyid, keyid+8);  passphrase_cb (void *hook, const char *uid_hint,
320                   const char *passphrase_info,
321          /* if the desc has a length of 32 and only hex digits, we assume a                 int prev_was_bad, int fd)
322             smart card has been used. */  {
323          if (uid_hint && strlen (uid_hint) == 32 && !is_hexstring (uid_hint)) {      passphrase_cb_s *c = (passphrase_cb_s*)hook;
324              char buf[16];      HANDLE hd = (HANDLE)fd;
325              memset (buf, 0, sizeof buf);      void *item;
326              strncpy (buf, uid_hint+20, 8);      const char *keyid=NULL, *pass;
327              _snprintf (c->info, sizeof c->info-1,      DWORD n;
328                         _("Please enter the PIN to unlock your secret card key\n"      int rc = 0;
329                           "Card: %s"), buf);  
330              c->is_card = 1;      if (!c) {
331          }          log_debug ("passphrase_cb: error '!c'\r\n");
332          else if (uid_hint)          return gpg_error (GPG_ERR_INV_ARG);
333              parse_gpg_description (uid_hint, passphrase_info,      }
334                                     c->info, sizeof c->info - 1);      c->bad_pwd = prev_was_bad? 1 : 0;
335          if (c->gpg_cmd == GPG_CMD_DECRYPT) {      if (prev_was_bad && !c->cancel) {
336              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,          if (c->pwd)
337                                   (HWND)c->hwnd, passphrase_callback_proc,              burn_passphrase (&c->pwd);
338                                   (LPARAM)c);          agent_del_cache (c->keyid);
339          }          c->pwd_init = 1;
340          else if (c->gpg_cmd == GPG_CMD_SIGN) {      }
341              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,  
342                                   (HWND)c->hwnd, passphrase_callback_proc,      if (passphrase_info) {
343                                   (LPARAM)c);          if (strlen (passphrase_info) < 16 &&
344          }              !strstr (passphrase_info, "OPENPGP")) {
345          if (rc == -1) {              /* assume symetric encryption. */
346              WriteFile (hd, "\n", 1, &n, NULL);              int pos=2;
347              return gpg_error (GPG_ERR_EOF);              c->sym.sym_algo = atoi (passphrase_info);
348          }              if (c->sym.sym_algo > 9)
349          c->pwd_init = 0;                  pos++;
350      }              /* XXX: be more strict. */
351      if (c->cancel) {              c->sym.s2k_mode = atoi (passphrase_info+pos);
352          WriteFile (hd, "\n", 1, &n, NULL);              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
353          return gpg_error (GPG_ERR_EOF);          }
354      }  
355            keyid = parse_gpg_keyid (passphrase_info);
356      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);          pass = agent_get_cache (keyid+8, &item);        
357      WriteFile (hd, "\n", 1, &n, NULL);          if (pass) {
358      return 0;              agent_unlock_cache_entry (&item);
359  }              c->pwd_init = 0;
360                if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
361                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
362  /* Initialize the given passphrase callback @cb with the              if (!WriteFile (hd, "\n", 1, &n, NULL))
363     used gpgme context @ctx, the command @cmd and a title                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
364     @title for the dialog. */              return 0;
365  void          }
366  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,      }
367                         int cmd, HWND hwnd, const char *title)  
368  {      if (c->pwd_init) {
369      memset (cb, 0, sizeof *cb);          if (keyid && strlen (keyid) == 16)
370      cb->gpg_cmd = cmd;              strcpy (c->keyid, keyid+8);
371      cb->is_card = 0;  
372      cb->cancel = 0;          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
373      cb->hwnd = hwnd;              has been used. */
374      cb->pwd_init = 1;          if (strstr (passphrase_info, "OPENPGP")) {
375      free_if_alloc (cb->title);              const char *s=passphrase_info;
376      cb->title = m_strdup (title);              while (s && *s && *s != 'D')
377      if (!cb->title)                  s++;
378          BUG (NULL);              _snprintf (c->info, sizeof c->info-1,
379      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);                         _("Please enter the PIN to unlock your secret card key\n"
380      cb->gpg = ctx;                           "Card: %s"), extract_serial_no (s));
381  }              c->is_card = 1;
382            }
383            else if (uid_hint)
384  /* Release a passphrase callback @ctx. */              parse_gpg_description (uid_hint, passphrase_info,
385  void                                     c->info, sizeof c->info - 1);
386  release_gpg_passphrase_cb (passphrase_cb_s *ctx)          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
387  {              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
388      if (!ctx)                                   (HWND)c->hwnd, passphrase_callback_proc,
389          return;                                   (LPARAM)c);
390      sfree_if_alloc (ctx->pwd);          }
391      free_if_alloc (ctx->title);          else if (c->gpg_cmd == GPG_CMD_SIGN) {
392  }              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
393                                     (HWND)c->hwnd, passphrase_callback_proc,
394  /* Simple check to measure passphrase (@pass) quality.                                   (LPARAM)c);
395     Return value: 0 on success. */          }
396  int          if (rc == -1) {
397  check_passwd_quality (const char *pass, int strict)              if (!WriteFile (hd, "\n", 1, &n, NULL))
398  {                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
399      int i, nd=0, nc=0, n;              return 0;
400            }
401      n = strlen (pass);          c->pwd_init = 0;
402      if (n < 8)      }
403          return -1;      if (c->cancel) {
404            if (!WriteFile (hd, "\n", 1, &n, NULL))
405      for (i=0; i < n; i++) {              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
406          if (isdigit (pass[i])) nd++;          return 0;
407          if (isalpha (pass[i])) nc++;      }
408      }  
409        if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
410      if (nd == n || nc == n)          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
411          return -1;      if (!WriteFile (hd, "\n", 1, &n, NULL))
412            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
413      return 0;      return 0;
414  }  }
415    
416    
417    /* Initialize the given passphrase callback @cb with the
418       used gpgme context @ctx, the command @cmd and a title
419       @title for the dialog. */
420    void
421    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
422                           int cmd, HWND hwnd, const char *title)
423    {
424        memset (cb, 0, sizeof *cb);
425        cb->gpg_cmd = cmd;
426        cb->bad_pwd = 0;
427        cb->is_card = 0;
428        cb->cancel = 0;
429        cb->hwnd = hwnd;
430        cb->pwd_init = 1;
431        free_if_alloc (cb->title);
432        cb->title = m_strdup (title);
433        if (!cb->title)
434            BUG (NULL);
435        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
436        cb->gpg = ctx;
437    }
438    
439    
440    /* Release a passphrase callback @ctx. */
441    void
442    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
443    {
444        gpgme_recipient_t r, n;
445    
446        if (!ctx)
447            return;
448        sfree_if_alloc (ctx->pwd);
449        free_if_alloc (ctx->title);
450        r = ctx->recipients;
451        while (r) {
452            n = r->next;
453            safe_free (r->keyid);
454            safe_free (r);
455            r = n;
456        }
457    }
458    
459    
460    /* Simple check to measure passphrase (@pass) quality.
461       Return value: 0 on success. */
462    int
463    check_passwd_quality (const char *pass, int strict)
464    {
465        int i, nd=0, nc=0, n;
466    
467        n = strlen (pass);
468        if (n < 8)
469            return -1;
470    
471        for (i=0; i < n; i++) {
472            if (isdigit (pass[i]))
473                nd++;
474            if (isalpha (pass[i]))
475                nc++;
476        }
477    
478        /* check that the passphrase contains letters and numbers. */
479        if (nd == n || nc == n)
480            return -1;
481    
482        return 0;
483    }

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