/[winpt]/trunk/Src/wptPassphraseCB.cpp
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revision 26 by twoaday, Mon Oct 17 08:49:30 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  /* Overwrite passphrase and free memory. */  #define item_ctrl_id2(cmd) \
50  static void      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
51  burn_passphrase (char **pwd)  
52  {  
53      char *pass = *pwd;    /* Overwrite passphrase and free memory. */
54      memset (pass, 0, strlen (pass));  static void
55      delete []pass;  burn_passphrase (char **pwd)
56      *pwd = NULL;  {
57  }      char *pass = *pwd;
58        wipememory (pass, strlen (pass));
59        delete []pass;
60  /* Dialog procedure for the passphrase callback. */      *pwd = NULL;
61  static BOOL CALLBACK  }
62  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)  
63  {      
64      static passphrase_cb_s * c;  /* Dialog procedure for the passphrase callback. */
65      gpgme_decrypt_result_t res;  static BOOL CALLBACK
66      gpgme_sign_result_t res_sig;  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
67      gpgme_key_t key;  {    
68      void *ctx = NULL, *item;      static passphrase_cb_s *c;
69      const char *id;      gpgme_decrypt_result_t res=NULL;
70      char *info;      gpgme_sign_result_t res_sig=NULL;
71      int n;      gpgme_key_t key;
72        gpgme_recipient_t recip=NULL, r;
73      switch (msg) {      void *item;
74      case WM_INITDIALOG:      const char *id;
75          c = (passphrase_cb_s *)lparam;      char *info;
76          if (!c)      int n;
77              BUG (0);  
78          SetWindowText (dlg, c->title);      switch (msg) {
79          if (c->gpg_cmd == GPG_CMD_DECRYPT) {      case WM_INITDIALOG:
80              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,          c = (passphrase_cb_s *)lparam;
81                  _("Encrypted with the following public key(s)") );          if (!c)
82              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );              BUG (0);
83          }          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
84          else if (c->gpg_cmd == GPG_CMD_SIGN)          SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
85              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);          SetWindowText (dlg, c->title);
86          res = gpgme_op_decrypt_result (c->gpg);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
87          if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
88              gpgme_recipient_t r;                              _("Encrypted with the following public key(s)"));
89                CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
90              /* XXX: not all ENCRYPT_TO entries are listed here. */          }
91              for (r = res->recipients; r; r = r->next) {          else if (c->gpg_cmd == GPG_CMD_SIGN) {
92                  get_pubkey (r->keyid, &key);              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
93                  if (key) {              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
94                      char *uid;          }
95                      id = key->uids->name;          if (c->recipients)
96                      if (!id)              recip = c->recipients; /* recipients were already extracted. */
97                          id = _("Invalid User ID");          else {
98                      uid = utf8_to_wincp (id, strlen (id));              /* XXX: not all ENCRYPT_TO entries are listed here. */
99                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1              res = gpgme_op_decrypt_result (c->gpg);
100                                       + strlen (key->uids->email)+1];              if (res && res->recipients)
101                      if (!info)                  recip = res->recipients;
102                          BUG (NULL);          }
103                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
104                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);              for (r = res->recipients; r; r = r->next) {
105                      free (uid);                  get_pubkey (r->keyid, &key);
106                                        if (key) {
107                  }                      gpgme_user_id_t u = key->uids;
108                  else {                      char *uid;
109                      info = new char [32 + strlen (r->keyid)+1 + 4];  
110                      if (!info)                      id = u->name;
111                          BUG (NULL);                      if (!id)
112                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),                          id = _("Invalid User ID");
113                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                      uid = utf8_to_wincp (id, strlen (id));
114                  }                      n = 32+strlen (uid)+1+4+strlen (r->keyid)+1;
115                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);                      if (u->email)
116                  free_if_alloc (info);                          n += strlen (u->email)+1;
117              }                      info = new char [n+1];
118          }                      if (!info)
119          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                          BUG (NULL);
120              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);                      if (!u->email || strlen (u->email) < 1)
121          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?                          sprintf (info, "%s (%s, 0x%s)", uid,
122                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
123                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :                      else
124                          _("Please enter your passphrase"));                          sprintf (info, "%s <%s> (%s, 0x%s)", uid, u->email,
125          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
126              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));                      free (uid);
127              if (res && !res->recipients) {                  }
128                  const char *s = _("Symmetric encryption.\n"                  else {
129                                    "%s encrypted data.");                      info = new char [32 + strlen (r->keyid)+1 + 4];
130                  const char *alg = get_symkey_algo (c->sym.sym_algo);                      if (!info)
131                  info = new char[strlen (s) + strlen (alg) + 2];                          BUG (NULL);
132                  if (!info)                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
133                      BUG (NULL);                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
134                  sprintf (info, s, alg);                  }
135                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
136                  free_if_alloc (info);                  free_if_alloc (info);
137              }              }
138              else          }
139                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
140          }              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
141          else {          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
142              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
143              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
144          }                          _("Please enter your passphrase"));
145          center_window (dlg, NULL);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
146          SetForegroundWindow (dlg);              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
147          set_active_window (dlg);              if (res && !res->recipients) {
148          return FALSE;                  const char *s = _("Symmetric encryption.\n"
149                                      "%s encrypted data.");
150          case WM_SYSCOMMAND:                  const char *alg = get_symkey_algo (c->sym.sym_algo);
151              if (LOWORD (wparam) == SC_CLOSE) {                  info = new char[strlen (s) + strlen (alg) + 2];
152                  SetDlgItemText (dlg, item_ctrl_id( c->gpg_cmd ), "");                  if (!info)
153                  c->cancel = 1;                      BUG (NULL);
154                  EndDialog (dlg, TRUE);                  sprintf (info, s, alg);
155              }                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
156              break;                  free_if_alloc (info);
157                }
158          case WM_COMMAND:              else
159              switch( HIWORD( wparam ) ) {                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
160              case BN_CLICKED:          }
161                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE          else {
162                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
163                      HWND hwnd;              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
164                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));          }
165                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));          center_window (dlg, NULL);
166                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);          SetForegroundWindow (dlg);
167                      SetFocus (hwnd);          return FALSE;
168                  }  
169              }          case WM_SYSCOMMAND:
170                if (LOWORD (wparam) == SC_CLOSE) {
171              switch (LOWORD (wparam)) {                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
172              case IDOK:                    c->cancel = 1;
173                  /* fixme: the item is even cached when the passphrase is not                  EndDialog (dlg, TRUE);
174                            correct, which means that the user needs to delete all              }
175                            cached entries to continue. */              break;
176                  if (c->pwd)  
177                      burn_passphrase (&c->pwd);          case WM_COMMAND:
178                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));              switch (HIWORD (wparam)) {
179                  if (!n) {              case BN_CLICKED:
180                      c->pwd = new char[2];                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
181                      if (!c->pwd)                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
182                          BUG (NULL);                      HWND hwnd;
183                      strcpy (c->pwd, "");                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
184                  }                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
185                  else {                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
186                      c->pwd = new char[n+2];                      SetFocus (hwnd);
187                      if (!c->pwd)                  }
188                          BUG (NULL);              }
189                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);  
190                  }              switch (LOWORD (wparam)) {
191                  res = gpgme_op_decrypt_result (c->gpg);              case IDOK:  
192                  if (!res)                  /* XXX: the item is even cached when the passphrase is not
193                      res_sig = gpgme_op_sign_result (c->gpg);                          correct, which means that the user needs to delete all
194                  if (reg_prefs.cache_time > 0 && !c->is_card &&                          cached entries to continue. */
195                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                  if (c->pwd)
196                      if (agent_get_cache (c->keyid, &item))                      burn_passphrase (&c->pwd);
197                          agent_unlock_cache_entry (&item);                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
198                      else                  if (!n) {
199                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                      c->pwd = new char[2];
200                  }                      if (!c->pwd)
201                  EndDialog (dlg, TRUE);                          BUG (NULL);
202                  return TRUE;                      strcpy (c->pwd, "");
203                                    }
204              case IDCANCEL:                  else {
205                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                      c->pwd = new char[n+2];
206                  c->cancel = 1;                      if (!c->pwd)
207                  EndDialog (dlg, FALSE);                          BUG (NULL);
208                  return FALSE;                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
209              }                  }
210              break;                  res = gpgme_op_decrypt_result (c->gpg);
211      }                  if (!res)
212                            res_sig = gpgme_op_sign_result (c->gpg);            
213      return FALSE;                  if (reg_prefs.cache_time > 0 && !c->is_card &&
214  }                      (res || res_sig)) {
215                        if (agent_get_cache (c->keyid, &item))                      
216                            agent_unlock_cache_entry (&item);
217  /* Extract the main keyid from @pass_info.                      else
218     Return value: long main keyid or NULL for an error. */                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
219  static const char*                  }
220  parse_gpg_keyid (const char *pass_info)                  c->cancel = 0;
221  {                  EndDialog (dlg, TRUE);
222      static char keyid[16+1];                  return TRUE;
223                        
224      /* XXX: check for leading alpha-chars? */              case IDCANCEL:
225      if (strlen (pass_info) < 16)                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
226          return NULL;                  c->cancel = 1;
227      /* the format of the desc buffer looks like this:                  EndDialog (dlg, FALSE);
228         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                  return FALSE;
229         we use the main keyid to use only one cache entry. */              }
230      strncpy (keyid, pass_info+17, 16);              break;
231      keyid[16] = 0;      }
232      return keyid;      
233  }      return FALSE;
234    }
235    
236  /* Parse the information in @uid_hint and @pass_info to generate  
237     a input message for the user in @desc. */  /* Extract the main keyid from @pass_info.
238  static int     Return value: long main keyid or NULL for an error. */
239  parse_gpg_description (const char *uid_hint, const char *pass_info,  static const char*
240                         char *desc, int size)  parse_gpg_keyid (const char *pass_info)
241  {  {
242      gpgme_pubkey_algo_t algo;      static char keyid[16+1];
243      char usedkey[16+1], mainkey[16+1];      
244      char *uid, *p;      /* XXX: check for leading alpha-chars? */
245      int n=0;      if (strlen (pass_info) < 16) {
246            log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
247      if (strlen (uid_hint) < 17) {          return NULL;
248          *desc = 0;      }
249          return -1;      /* the format of the desc buffer looks like this:
250      }         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
251           we use the main keyid to use only one cache entry. */
252      while (p = strsep ((char**)&pass_info, " ")) {      strncpy (keyid, pass_info+17, 16);
253          switch (n++) {      keyid[16] = 0;
254          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;      return keyid;
255          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;  }
256          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;  
257          }  
258      }  /* Parse the information in @uid_hint and @pass_info to generate
259      uid_hint += 16; /* skip keyid */     a input message for the user in @desc. */
260      uid_hint += 1;  /* space */  static int
261    parse_gpg_description (const char *uid_hint, const char *pass_info,
262      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));                         char *desc, int size)
263    {
264      if (strcmp (usedkey, mainkey))      gpgme_pubkey_algo_t algo;
265          _snprintf (desc, size-1,      char usedkey[16+1];
266                     _("You need a passphrase to unlock the secret key for\n"      char mainkey[16+1];
267                       "user: \"%s\"\n"      char *uid, *p;
268                       "%s key, ID %s (main key ID %s)\n"),      int n=0;
269                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);  
270      else if (!strcmp (usedkey, mainkey))      algo = (gpgme_pubkey_algo_t)0;
271          _snprintf (desc, size-1,      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
272                     _("You need a passphrase to unlock the secret key for\n"      if (strlen (uid_hint) < 17) {
273                       "user: \"%s\"\n"          *desc = 0;
274                       "%s key, ID %s\n"),          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
275                       uid, get_key_pubalgo (algo), usedkey+8);          return -1;
276      free (uid);      }
277      return 0;  
278  }      while (p = strsep ((char**)&pass_info, " ")) {
279            switch (n++) {
280            case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
281  /*          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
282  static int inline          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
283  is_hexstring (const char * p)          }
284  {      }
285      size_t i;      uid_hint += 16; /* skip keyid */
286        uid_hint += 1;  /* space */
287      for (i=0; i < strlen (p); i++) {  
288          if (!isxdigit (p[i]))      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
289              return -1;  
290      }      if (strcmp (usedkey, mainkey))
291      return 0;          _snprintf (desc, size-1,
292  }                     _("You need a passphrase to unlock the secret key for\n"
293  */                       "user: \"%s\"\n"
294                         "%s key, ID %s (main key ID %s)\n"),
295  /* Passphrase callback with the ability to support caching. */                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
296  gpgme_error_t      else if (!strcmp (usedkey, mainkey))
297  passphrase_cb (void *hook, const char *uid_hint,          _snprintf (desc, size-1,
298                 const char *passphrase_info,                     _("You need a passphrase to unlock the secret key for\n"
299                 int prev_was_bad, int fd)                       "user: \"%s\"\n"
300  {                       "%s key, ID %s\n"),
301      passphrase_cb_s *c = (passphrase_cb_s*)hook;                       uid, get_key_pubalgo (algo), usedkey+8);
302      HANDLE hd = (HANDLE)fd;      free (uid);
303      void *item;      return 0;
304      const char *keyid, *pass;  }
305      DWORD n;  
306      int rc;  
307    /* Extract the serial number from the card ID @id and return it. */
308      if (!c)  const char*
309          return gpg_error (GPG_ERR_INV_ARG);  extract_serial_no (const char *id)
310      c->bad_pwd = prev_was_bad? 1 : 0;  {
311      if (prev_was_bad && !c->cancel) {      static char buf[8];
312          if (c->pwd)      char *p;
313              burn_passphrase (&c->pwd);  
314          agent_del_cache (c->keyid);      p = strchr (id, '/');
315          c->pwd_init = 1;      if (!p) {
316      }          log_debug ("extract_serial_no: error '%s'\r\n", id);
317            return NULL;
318      if (passphrase_info) {      }
319          if (strlen (passphrase_info) < 16 &&      strncpy (buf, id+(p-id)-6, 6);
320              !strstr (passphrase_info, "OPENPGP")) {/* assume symetric encryption. */      return buf;
321              int n=2;  }
322              c->sym.sym_algo = atoi (passphrase_info);  
323              if (c->sym.sym_algo > 9)  
324                  n++;  /* Passphrase callback with the ability to support caching. */
325              /* XXX: be more strict. */  gpgme_error_t
326              c->sym.s2k_mode = atoi (passphrase_info+n);  passphrase_cb (void *hook, const char *uid_hint,
327              c->sym.s2k_hash = atoi (passphrase_info+n+2);                 const char *passphrase_info,
328          }                 int prev_was_bad, int fd)
329    {
330          keyid = parse_gpg_keyid (passphrase_info);      passphrase_cb_s *c = (passphrase_cb_s*)hook;
331          pass = agent_get_cache (keyid+8, &item);      HANDLE hd = (HANDLE)fd;
332          if (pass) {      void *item;
333              agent_unlock_cache_entry (&item);      const char *keyid=NULL, *pass;
334              c->pwd_init = 0;      DWORD n;
335              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))      int rc = 0;
336                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);  
337              if (!WriteFile (hd, "\n", 1, &n, NULL))      if (!c) {
338                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);          log_debug ("passphrase_cb: error '!c'\r\n");
339              return 0;          return gpg_error (GPG_ERR_INV_ARG);
340          }      }
341      }      c->bad_pwd = prev_was_bad? 1 : 0;
342        if (prev_was_bad && !c->cancel) {
343      if (c->pwd_init) {          if (c->pwd)
344          if (keyid && strlen (keyid) == 16)              burn_passphrase (&c->pwd);
345              strcpy (c->keyid, keyid+8);          agent_del_cache (c->keyid);
346            c->pwd_init = 1;
347          /* if @passphrase_info contains 'OPENPGP' we assume a smart card      }
348              has been used. */  
349          if (strstr (passphrase_info, "OPENPGP")) {      if (passphrase_info) {
350              char buf[16];          if (strlen (passphrase_info) < 16 &&
351              memset (buf, 0, sizeof buf);              !strstr (passphrase_info, "OPENPGP")) {
352              strncpy (buf, "??", 2); /* XXX: fixme we need the serial no. */              /* assume symetric encryption. */
353              _snprintf (c->info, sizeof c->info-1,              int pos=2;
354                         _("Please enter the PIN to unlock your secret card key\n"              c->sym.sym_algo = atoi (passphrase_info);
355                           "Card: %s"), buf);              if (c->sym.sym_algo > 9)
356              c->is_card = 1;                  pos++;
357          }              /* XXX: be more strict. */
358          else if (uid_hint)              c->sym.s2k_mode = atoi (passphrase_info+pos);
359              parse_gpg_description (uid_hint, passphrase_info,              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
360                                     c->info, sizeof c->info - 1);          }
361          if (c->gpg_cmd == GPG_CMD_DECRYPT) {  
362              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,          keyid = parse_gpg_keyid (passphrase_info);
363                                   (HWND)c->hwnd, passphrase_callback_proc,          pass = agent_get_cache (keyid+8, &item);        
364                                   (LPARAM)c);          if (pass) {
365          }              agent_unlock_cache_entry (&item);
366          else if (c->gpg_cmd == GPG_CMD_SIGN) {              c->pwd_init = 0;
367              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
368                                   (HWND)c->hwnd, passphrase_callback_proc,                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
369                                   (LPARAM)c);              if (!WriteFile (hd, "\n", 1, &n, NULL))
370          }                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
371          if (rc == -1) {              return 0;
372              WriteFile (hd, "\n", 1, &n, NULL);          }
373              return 0;      }
374          }  
375          c->pwd_init = 0;      if (c->pwd_init) {
376      }          if (keyid && strlen (keyid) == 16)
377      if (c->cancel) {              strcpy (c->keyid, keyid+8);
378          WriteFile (hd, "\n", 1, &n, NULL);  
379          return 0;          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
380      }              has been used. */
381            if (strstr (passphrase_info, "OPENPGP")) {
382      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);              const char *s=passphrase_info;
383      WriteFile (hd, "\n", 1, &n, NULL);              while (s && *s && *s != 'D')
384      return 0;                  s++;
385  }              _snprintf (c->info, sizeof c->info-1,
386                           _("Please enter the PIN to unlock your secret card key\n"
387                             "Card: %s"), extract_serial_no (s));
388  /* Initialize the given passphrase callback @cb with the              c->is_card = 1;
389     used gpgme context @ctx, the command @cmd and a title          }
390     @title for the dialog. */          else if (uid_hint)
391  void              parse_gpg_description (uid_hint, passphrase_info,
392  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,                                     c->info, sizeof c->info - 1);
393                         int cmd, HWND hwnd, const char *title)          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
394  {              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
395      memset (cb, 0, sizeof *cb);                                   (HWND)c->hwnd, passphrase_callback_proc,
396      cb->gpg_cmd = cmd;                                   (LPARAM)c);
397      cb->bad_pwd = 0;          }
398      cb->is_card = 0;          else if (c->gpg_cmd == GPG_CMD_SIGN) {
399      cb->cancel = 0;              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
400      cb->hwnd = hwnd;                                   (HWND)c->hwnd, passphrase_callback_proc,
401      cb->pwd_init = 1;                                   (LPARAM)c);
402      free_if_alloc (cb->title);          }
403      cb->title = m_strdup (title);          if (rc == -1) {
404      if (!cb->title)              if (!WriteFile (hd, "\n", 1, &n, NULL))
405          BUG (NULL);                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
406      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);              return 0;
407      cb->gpg = ctx;          }
408  }          c->pwd_init = 0;
409        }
410        if (c->cancel) {
411  /* Release a passphrase callback @ctx. */          if (!WriteFile (hd, "\n", 1, &n, NULL))
412  void              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
413  release_gpg_passphrase_cb (passphrase_cb_s *ctx)          return 0;
414  {      }
415      if (!ctx)  
416          return;      if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
417      sfree_if_alloc (ctx->pwd);          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
418      free_if_alloc (ctx->title);      if (!WriteFile (hd, "\n", 1, &n, NULL))
419  }          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
420        return 0;
421    }
422  /* Simple check to measure passphrase (@pass) quality.  
423     Return value: 0 on success. */  
424  int  /* Initialize the given passphrase callback @cb with the
425  check_passwd_quality (const char *pass, int strict)     used gpgme context @ctx, the command @cmd and a title
426  {     @title for the dialog. */
427      int i, nd=0, nc=0, n;  void
428    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
429      n = strlen (pass);                         int cmd, HWND hwnd, const char *title)
430      if (n < 8)  {
431          return -1;      memset (cb, 0, sizeof *cb);
432        cb->gpg_cmd = cmd;
433      for (i=0; i < n; i++) {      cb->bad_pwd = 0;
434          if (isdigit (pass[i])) nd++;      cb->is_card = 0;
435          if (isalpha (pass[i])) nc++;      cb->cancel = 0;
436      }      cb->hwnd = hwnd;
437        cb->pwd_init = 1;
438      if (nd == n || nc == n)      free_if_alloc (cb->title);
439          return -1;      cb->title = m_strdup (title);
440        if (!cb->title)
441      return 0;          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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