/[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 160 by twoaday, Thu Jan 19 09:22:09 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, 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, IDCANCEL, _("&Cancel"));
84                      id = key->uids->name;          SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
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,              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
93                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
94                      free (uid);          }
95                                if (c->recipients)
96                  }              recip = c->recipients; /* recipients were already extracted. */
97                  else {          else {
98                      info = new char [32 + strlen (r->keyid)+1 + 4];              /* XXX: not all ENCRYPT_TO entries are listed here. */
99                      if (!info)              res = gpgme_op_decrypt_result (c->gpg);
100                          BUG (NULL);              if (res && res->recipients)
101                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),                  recip = res->recipients;
102                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);          }
103                  }          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
104                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);              for (r = res->recipients; r; r = r->next) {
105                  free_if_alloc (info);                  get_pubkey (r->keyid, &key);
106              }                  if (key) {
107          }                      gpgme_user_id_t u = key->uids;
108          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                      char *uid;
109              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);  
110          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?                      id = u->name;
111                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                      if (!id)
112                          _("Please enter your passphrase"));                          id = _("Invalid User ID");
113          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                      uid = utf8_to_wincp (id, strlen (id));
114              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));                      n = 32+strlen (uid)+1+4+strlen (r->keyid)+1;
115              if (res && !res->recipients) {                      if (u->email)
116                  const char *s = _("Symmetric encryption.\n"                          n += strlen (u->email)+1;
117                                    "%s encrypted data.");                      info = new char [n+1];
118                  const char *alg = get_symkey_algo (c->sym.sym_algo);                      if (!info)
119                  info = new char[strlen (s) + strlen (alg) + 2];                          BUG (NULL);
120                  if (!info)                      if (!u->email || strlen (u->email) < 1)
121                      BUG (NULL);                          sprintf (info, "%s (%s, 0x%s)", uid,
122                  sprintf (info, s, alg);                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
123                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);                      else
124                  free_if_alloc (info);                          sprintf (info, "%s <%s> (%s, 0x%s)", uid, u->email,
125              }                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
126              else                      free (uid);
127                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                  }
128          }                  else {
129          else {                      info = new char [32 + strlen (r->keyid)+1 + 4];
130              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));                      if (!info)
131              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);                          BUG (NULL);
132          }                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
133          center_window (dlg, NULL);                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
134          SetForegroundWindow (dlg);                  }
135          set_active_window (dlg);                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
136          return FALSE;                  free_if_alloc (info);
137                }
138          case WM_SYSCOMMAND:          }
139              if( LOWORD( wparam ) == SC_CLOSE ) {          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
140                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
141                  c->cancel = 1;          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
142                  EndDialog( dlg, TRUE );                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
143              }                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
144              break;                          _("Please enter your passphrase"));
145            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
146          case WM_COMMAND:              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
147              switch( HIWORD( wparam ) ) {              if (res && !res->recipients) {
148              case BN_CLICKED:                  const char *s = _("Symmetric encryption.\n"
149                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE                                    "%s encrypted data.");
150                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                  const char *alg = get_symkey_algo (c->sym.sym_algo);
151                      HWND hwnd;                  info = new char[strlen (s) + strlen (alg) + 2];
152                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));                  if (!info)
153                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));                      BUG (NULL);
154                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);                  sprintf (info, s, alg);
155                      SetFocus (hwnd);                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
156                  }                  free_if_alloc (info);
157              }              }
158                else
159              switch (LOWORD (wparam)) {                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
160              case IDOK:            }
161                  /* fixme: the item is even cached when the passphrase is not          else {
162                            correct, which means that the user needs to delete all              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
163                            cached entries to continue. */              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
164                  if (c->pwd) {          }
165                      delete []c->pwd;          center_window (dlg, NULL);
166                      c->pwd = NULL;          SetForegroundWindow (dlg);
167                  }          return FALSE;
168                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));  
169                  if (!n) {          case WM_SYSCOMMAND:
170                      c->pwd = new char[2];              if (LOWORD (wparam) == SC_CLOSE) {
171                      strcpy (c->pwd, "");                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
172                  }                  c->cancel = 1;
173                  else {                  EndDialog (dlg, TRUE);
174                      c->pwd = new char[n+2];              }
175                      if (!c->pwd)              break;
176                          BUG (NULL);  
177                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);          case WM_COMMAND:
178                  }              switch (HIWORD (wparam)) {
179                  res = gpgme_op_decrypt_result (c->gpg);              case BN_CLICKED:
180                  if (!res)                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
181                      res_sig = gpgme_op_sign_result (c->gpg);                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
182                  if (reg_prefs.cache_time > 0 && !c->is_card &&                      HWND hwnd;
183                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
184                      if (agent_get_cache (c->keyid, &item))                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
185                          agent_unlock_cache_entry (&item);                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
186                      else                      SetFocus (hwnd);
187                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                  }
188                  }              }
189                  EndDialog (dlg, TRUE);  
190                  return TRUE;              switch (LOWORD (wparam)) {
191                                case IDOK:  
192              case IDCANCEL:                  /* XXX: the item is even cached when the passphrase is not
193                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                          correct, which means that the user needs to delete all
194                  c->cancel = 1;                          cached entries to continue. */
195                  EndDialog (dlg, FALSE);                  if (c->pwd)
196                  return FALSE;                      burn_passphrase (&c->pwd);
197              }                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
198              break;                  if (!n) {
199      }                      c->pwd = new char[2];
200                            if (!c->pwd)
201      return FALSE;                          BUG (NULL);
202  }                      strcpy (c->pwd, "");
203                    }
204                    else {
205  /* Extract the main keyid from @pass_info.                      c->pwd = new char[n+2];
206     Return value: long main keyid or NULL for an error. */                      if (!c->pwd)
207  static const char*                          BUG (NULL);
208  parse_gpg_keyid (const char *pass_info)                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
209  {                  }
210      static char keyid[16+1];                  res = gpgme_op_decrypt_result (c->gpg);
211                        if (!res)
212      if (strlen (pass_info) < 16)                      res_sig = gpgme_op_sign_result (c->gpg);            
213          return NULL;                  if (reg_prefs.cache_time > 0 && !c->is_card &&
214      /* the format of the desc buffer looks like this:                      (res || res_sig)) {
215         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                      if (agent_get_cache (c->keyid, &item))                      
216         we use the main keyid to use only one cache entry. */                          agent_unlock_cache_entry (&item);
217      strncpy (keyid, pass_info+17, 16);                      else
218      keyid[16] = 0;                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
219      return keyid;                  }
220  }                  c->cancel = 0;
221                    EndDialog (dlg, TRUE);
222                    return TRUE;
223  /* Parse the information in @uid_hint and @pass_info to generate                  
224     a input message for the user in @desc. */              case IDCANCEL:
225  static void                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
226  parse_gpg_description (const char *uid_hint, const char *pass_info,                  c->cancel = 1;
227                         char *desc, int size)                  EndDialog (dlg, FALSE);
228  {                  return FALSE;
229      gpgme_pubkey_algo_t algo;              }
230      char usedkey[16+1], mainkey[16+1];              break;
231      char *uid, *p;      }
232      int n=0;      
233        return FALSE;
234      while (p = strsep ((char**)&pass_info, " ")) {  }
235          switch (n++) {  
236          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;  
237          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;  /* Extract the main keyid from @pass_info.
238          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;     Return value: long main keyid or NULL for an error. */
239          }  static const char*
240      }  parse_gpg_keyid (const char *pass_info)
241      uid_hint += 16; /* skip keyid */  {
242      uid_hint += 1;  /* space */      static char keyid[16+1];
243        
244      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));      /* XXX: check for leading alpha-chars? */
245        if (strlen (pass_info) < 16) {
246      if (strcmp (usedkey, mainkey))          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
247          _snprintf (desc, size-1,          return NULL;
248                     _("You need a passphrase to unlock the secret key for\n"      }
249                       "user: \"%s\"\n"      /* the format of the desc buffer looks like this:
250                       "%s key, ID %s (main key ID %s)\n"),         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
251                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);         we use the main keyid to use only one cache entry. */
252      else if (!strcmp (usedkey, mainkey))      strncpy (keyid, pass_info+17, 16);
253          _snprintf (desc, size-1,      keyid[16] = 0;
254                     _("You need a passphrase to unlock the secret key for\n"      return keyid;
255                       "user: \"%s\"\n"  }
256                       "%s key, ID %s\n"),  
257                       uid, get_key_pubalgo (algo), usedkey+8);  
258      free (uid);  /* Parse the information in @uid_hint and @pass_info to generate
259  }     a input message for the user in @desc. */
260    static int
261    parse_gpg_description (const char *uid_hint, const char *pass_info,
262  static int inline                         char *desc, int size)
263  is_hexstring (const char * p)  {
264  {      gpgme_pubkey_algo_t algo;
265      size_t i;      char usedkey[16+1];
266        char mainkey[16+1];
267      for (i=0; i < strlen (p); i++) {      char *uid, *p;
268          if (!isxdigit (p[i]))      int n=0;
269              return -1;  
270      }      algo = (gpgme_pubkey_algo_t)0;
271      return 0;      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
272  }      if (strlen (uid_hint) < 17) {
273            *desc = 0;
274            log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
275  /* Passphrase callback with the ability to support caching. */          return -1;
276  gpgme_error_t      }
277  passphrase_cb (void *hook, const char *uid_hint,  
278                 const char *passphrase_info,      while (p = strsep ((char**)&pass_info, " ")) {
279                 int prev_was_bad, int fd)          switch (n++) {
280  {          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
281      passphrase_cb_s *c = (passphrase_cb_s*)hook;          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
282      HANDLE hd = (HANDLE)fd;          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
283      void *item;          }
284      const char *keyid, *pass;      }
285      DWORD n;      uid_hint += 16; /* skip keyid */
286      int rc;      uid_hint += 1;  /* space */
287    
288      /* XXX: pubkey_enc cancel does not quit gpg.exe */      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
289      /* XXX: handle prev_was_bad case. */  
290      if (!c)      if (strcmp (usedkey, mainkey))
291          return gpg_error (GPG_ERR_INV_ARG);          _snprintf (desc, size-1,
292                       _("You need a passphrase to unlock the secret key for\n"
293      if (passphrase_info) {                       "user: \"%s\"\n"
294          if (strlen (passphrase_info) < 16) {/* assume symetric encryption. */                       "%s key, ID %s (main key ID %s)\n"),
295              int n=2;                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
296              c->sym.sym_algo = atoi (passphrase_info);      else if (!strcmp (usedkey, mainkey))
297              if (c->sym.sym_algo > 9)          _snprintf (desc, size-1,
298                  n++;                     _("You need a passphrase to unlock the secret key for\n"
299              /* XXX: be more strict. */                       "user: \"%s\"\n"
300              c->sym.s2k_mode = atoi (passphrase_info+n);                       "%s key, ID %s\n"),
301              c->sym.s2k_hash = atoi (passphrase_info+n+2);                       uid, get_key_pubalgo (algo), usedkey+8);
302          }      free (uid);
303        return 0;
304          keyid = parse_gpg_keyid (passphrase_info);  }
305          pass = agent_get_cache (keyid+8, &item);  
306          if (pass) {  
307              agent_unlock_cache_entry (&item);  /* Extract the serial number from the card ID @id and return it. */
308              c->pwd_init = 0;  const char*
309              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))  extract_serial_no (const char *id)
310                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);  {
311              if (!WriteFile (hd, "\n", 1, &n, NULL))      static char buf[8];
312                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);      char *p;
313              return 0;  
314          }      p = strchr (id, '/');
315      }      if (!p) {
316            log_debug ("extract_serial_no: error '%s'\r\n", id);
317      if (c->pwd_init) {          return NULL;
318          if (keyid && strlen (keyid) == 16)      }
319              strcpy (c->keyid, keyid+8);      strncpy (buf, id+(p-id)-6, 6);
320        return buf;
321          /* if the desc has a length of 32 and only hex digits, we assume a  }
322             smart card has been used. */  
323          if (uid_hint && strlen (uid_hint) == 32 && !is_hexstring (uid_hint)) {  
324              char buf[16];  /* Passphrase callback with the ability to support caching. */
325              memset (buf, 0, sizeof buf);  gpgme_error_t
326              strncpy (buf, uid_hint+20, 8);  passphrase_cb (void *hook, const char *uid_hint,
327              _snprintf (c->info, sizeof c->info-1,                 const char *passphrase_info,
328                         _("Please enter the PIN to unlock your secret card key\n"                 int prev_was_bad, int fd)
329                           "Card: %s"), buf);  {
330              c->is_card = 1;      passphrase_cb_s *c = (passphrase_cb_s*)hook;
331          }      HANDLE hd = (HANDLE)fd;
332          else if (uid_hint)      void *item;
333              parse_gpg_description (uid_hint, passphrase_info,      const char *keyid=NULL, *pass;
334                                     c->info, sizeof c->info - 1);      DWORD n;
335          if (c->gpg_cmd == GPG_CMD_DECRYPT) {      int rc = 0;
336              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,  
337                                   (HWND)c->hwnd, passphrase_callback_proc,      if (!c) {
338                                   (LPARAM)c);          log_debug ("passphrase_cb: error '!c'\r\n");
339          }          return gpg_error (GPG_ERR_INV_ARG);
340          else if (c->gpg_cmd == GPG_CMD_SIGN) {      }
341              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,      c->bad_pwd = prev_was_bad? 1 : 0;
342                                   (HWND)c->hwnd, passphrase_callback_proc,      if (prev_was_bad && !c->cancel) {
343                                   (LPARAM)c);          if (c->pwd)
344          }              burn_passphrase (&c->pwd);
345          if (rc == -1) {          agent_del_cache (c->keyid);
346              WriteFile (hd, "\n", 1, &n, NULL);          c->pwd_init = 1;
347              return gpg_error (GPG_ERR_EOF);      }
348          }  
349          c->pwd_init = 0;      if (passphrase_info) {
350      }          if (strlen (passphrase_info) < 16 &&
351      if (c->cancel) {              !strstr (passphrase_info, "OPENPGP")) {
352          WriteFile (hd, "\n", 1, &n, NULL);              /* assume symetric encryption. */
353          return gpg_error (GPG_ERR_EOF);              int pos=2;
354      }              c->sym.sym_algo = atoi (passphrase_info);
355                if (c->sym.sym_algo > 9)
356      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);                  pos++;
357      WriteFile (hd, "\n", 1, &n, NULL);              /* XXX: be more strict. */
358      return 0;              c->sym.s2k_mode = atoi (passphrase_info+pos);
359  }              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
360            }
361    
362  /* Initialize the given passphrase callback @cb with the          keyid = parse_gpg_keyid (passphrase_info);
363     used gpgme context @ctx, the command @cmd and a title          pass = agent_get_cache (keyid+8, &item);        
364     @title for the dialog. */          if (pass) {
365  void              agent_unlock_cache_entry (&item);
366  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,              c->pwd_init = 0;
367                         int cmd, HWND hwnd, const char *title)              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
368  {                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
369      memset (cb, 0, sizeof *cb);              if (!WriteFile (hd, "\n", 1, &n, NULL))
370      cb->gpg_cmd = cmd;                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
371      cb->is_card = 0;              return 0;
372      cb->cancel = 0;          }
373      cb->hwnd = hwnd;      }
374      cb->pwd_init = 1;  
375      free_if_alloc (cb->title);      if (c->pwd_init) {
376      cb->title = m_strdup (title);          if (keyid && strlen (keyid) == 16)
377      if (!cb->title)              strcpy (c->keyid, keyid+8);
378          BUG (NULL);  
379      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
380      cb->gpg = ctx;              has been used. */
381  }          if (strstr (passphrase_info, "OPENPGP")) {
382                const char *s=passphrase_info;
383                while (s && *s && *s != 'D')
384  /* Release a passphrase callback @ctx. */                  s++;
385  void              _snprintf (c->info, sizeof c->info-1,
386  release_gpg_passphrase_cb (passphrase_cb_s *ctx)                         _("Please enter the PIN to unlock your secret card key\n"
387  {                           "Card: %s"), extract_serial_no (s));
388      if (!ctx)              c->is_card = 1;
389          return;          }
390      sfree_if_alloc (ctx->pwd);          else if (uid_hint)
391      free_if_alloc (ctx->title);              parse_gpg_description (uid_hint, passphrase_info,
392  }                                     c->info, sizeof c->info - 1);
393            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
394  /* Simple check to measure passphrase (@pass) quality.              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
395     Return value: 0 on success. */                                   (HWND)c->hwnd, passphrase_callback_proc,
396  int                                   (LPARAM)c);
397  check_passwd_quality (const char *pass, int strict)          }
398  {          else if (c->gpg_cmd == GPG_CMD_SIGN) {
399      int i, nd=0, nc=0, n;              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
400                                     (HWND)c->hwnd, passphrase_callback_proc,
401      n = strlen (pass);                                   (LPARAM)c);
402      if (n < 8)          }
403          return -1;          if (rc == -1) {
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      }          c->pwd_init = 0;
409        }
410      if (nd == n || nc == n)      if (c->cancel) {
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        if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
417            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
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    
423    
424    /* Initialize the given passphrase callback @cb with the
425       used gpgme context @ctx, the command @cmd and a title
426       @title for the dialog. */
427    void
428    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
429                           int cmd, HWND hwnd, const char *title)
430    {
431        memset (cb, 0, sizeof *cb);
432        cb->gpg_cmd = cmd;
433        cb->bad_pwd = 0;
434        cb->is_card = 0;
435        cb->cancel = 0;
436        cb->hwnd = hwnd;
437        cb->pwd_init = 1;
438        free_if_alloc (cb->title);
439        cb->title = m_strdup (title);
440        if (!cb->title)
441            BUG (NULL);
442        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
443        cb->gpg = ctx;
444    }
445    
446    
447    /* Release a passphrase callback @ctx. */
448    void
449    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
450    {
451        gpgme_recipient_t r, n;
452    
453        if (!ctx)
454            return;
455        sfree_if_alloc (ctx->pwd);
456        free_if_alloc (ctx->title);
457        r = ctx->recipients;
458        while (r) {
459            n = r->next;
460            safe_free (r->keyid);
461            safe_free (r);
462            r = n;
463        }
464    }
465    
466    
467    /* Simple check to measure passphrase (@pass) quality.
468       Return value: 0 on success. */
469    int
470    check_passwd_quality (const char *pass, int strict)
471    {
472        int i, nd=0, nc=0, n;
473    
474        n = strlen (pass);
475        if (n < 8)
476            return -1;
477    
478        for (i=0; i < n; i++) {
479            if (isdigit (pass[i]))
480                nd++;
481            if (isalpha (pass[i]))
482                nc++;
483        }
484    
485        /* check that the passphrase contains letters and numbers. */
486        if (nd == n || nc == n)
487            return -1;
488    
489        return 0;
490    }
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