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

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revision 26 by twoaday, Mon Oct 17 08:49:30 2005 UTC revision 47 by werner, Mon Oct 31 14:04:59 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 <windows.h>
28  #include "wptVersion.h"  #include <ctype.h>
29  #include "wptGPG.h"  
30  #include "wptCommonCtl.h"  #include "resource.h"
31  #include "wptContext.h"  #include "wptNLS.h"
32  #include "wptDlgs.h"  #include "wptW32API.h"
33  #include "wptUTF8.h"  #include "wptVersion.h"
34  #include "wptErrors.h"  #include "wptGPG.h"
35  #include "wptTypes.h"  #include "wptCommonCtl.h"
36  #include "wptKeyList.h"  #include "wptContext.h"
37  #include "wptAgent.h"  #include "wptDlgs.h"
38  #include "wptRegistry.h"  #include "wptUTF8.h"
39    #include "wptErrors.h"
40  const char* get_symkey_algo (int algo);  #include "wptTypes.h"
41    #include "wptKeyList.h"
42  #define item_ctrl_id( cmd ) \  #include "wptAgent.h"
43      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)  #include "wptRegistry.h"
44    
45  #define item_ctrl_id2(cmd) \  const char* get_symkey_algo (int algo);
46      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)  
47    #define item_ctrl_id( cmd ) \
48        ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
49  /* Overwrite passphrase and free memory. */  
50  static void  #define item_ctrl_id2(cmd) \
51  burn_passphrase (char **pwd)      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
52  {  
53      char *pass = *pwd;    
54      memset (pass, 0, strlen (pass));  /* Overwrite passphrase and free memory. */
55      delete []pass;  static void
56      *pwd = NULL;  burn_passphrase (char **pwd)
57  }  {
58        char *pass = *pwd;
59        wipememory (pass, strlen (pass));
60  /* Dialog procedure for the passphrase callback. */      delete []pass;
61  static BOOL CALLBACK      *pwd = NULL;
62  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)  }
63  {      
64      static passphrase_cb_s * c;  
65      gpgme_decrypt_result_t res;  /* Dialog procedure for the passphrase callback. */
66      gpgme_sign_result_t res_sig;  static BOOL CALLBACK
67      gpgme_key_t key;  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
68      void *ctx = NULL, *item;  {    
69      const char *id;      static passphrase_cb_s * c;
70      char *info;      gpgme_decrypt_result_t res;
71      int n;      gpgme_sign_result_t res_sig;
72        gpgme_key_t key;
73      switch (msg) {      gpgme_recipient_t recip, r;
74      case WM_INITDIALOG:      void *ctx = NULL, *item;
75          c = (passphrase_cb_s *)lparam;      const char *id;
76          if (!c)      char *info;
77              BUG (0);      int n;
78          SetWindowText (dlg, c->title);  
79          if (c->gpg_cmd == GPG_CMD_DECRYPT) {      switch (msg) {
80              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,      case WM_INITDIALOG:
81                  _("Encrypted with the following public key(s)") );          c = (passphrase_cb_s *)lparam;
82              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );          if (!c)
83          }              BUG (0);
84          else if (c->gpg_cmd == GPG_CMD_SIGN)          SetWindowText (dlg, c->title);
85              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
86          res = gpgme_op_decrypt_result (c->gpg);              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
87          if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {                              _("Encrypted with the following public key(s)"));
88              gpgme_recipient_t r;              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
89            }
90              /* XXX: not all ENCRYPT_TO entries are listed here. */          else if (c->gpg_cmd == GPG_CMD_SIGN)
91              for (r = res->recipients; r; r = r->next) {              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
92                  get_pubkey (r->keyid, &key);          if (c->recipients)
93                  if (key) {              recip = c->recipients; /* recipients were already extracted. */
94                      char *uid;          else {
95                      id = key->uids->name;              /* XXX: not all ENCRYPT_TO entries are listed here. */
96                      if (!id)              res = gpgme_op_decrypt_result (c->gpg);
97                          id = _("Invalid User ID");              if (res && res->recipients)
98                      uid = utf8_to_wincp (id, strlen (id));                  recip = res->recipients;
99                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1          }
100                                       + strlen (key->uids->email)+1];          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
101                      if (!info)              for (r = res->recipients; r; r = r->next) {
102                          BUG (NULL);                  get_pubkey (r->keyid, &key);
103                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,                  if (key) {
104                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                      char *uid;
105                      free (uid);                      id = key->uids->name;
106                                            if (!id)
107                  }                          id = _("Invalid User ID");
108                  else {                      uid = utf8_to_wincp (id, strlen (id));
109                      info = new char [32 + strlen (r->keyid)+1 + 4];                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1
110                      if (!info)                                       + strlen (key->uids->email)+1];
111                          BUG (NULL);                      if (!info)
112                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),                          BUG (NULL);
113                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,
114                  }                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
115                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);                      free (uid);
116                  free_if_alloc (info);                      
117              }                  }
118          }                  else {
119          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                      info = new char [32 + strlen (r->keyid)+1 + 4];
120              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);                      if (!info)
121          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?                          BUG (NULL);
122                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
123                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
124                          _("Please enter your passphrase"));                  }
125          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
126              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));                  free_if_alloc (info);
127              if (res && !res->recipients) {              }
128                  const char *s = _("Symmetric encryption.\n"          }
129                                    "%s encrypted data.");          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
130                  const char *alg = get_symkey_algo (c->sym.sym_algo);              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
131                  info = new char[strlen (s) + strlen (alg) + 2];          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
132                  if (!info)                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
133                      BUG (NULL);                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
134                  sprintf (info, s, alg);                          _("Please enter your passphrase"));
135                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
136                  free_if_alloc (info);              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
137              }              if (res && !res->recipients) {
138              else                  const char *s = _("Symmetric encryption.\n"
139                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                                    "%s encrypted data.");
140          }                  const char *alg = get_symkey_algo (c->sym.sym_algo);
141          else {                  info = new char[strlen (s) + strlen (alg) + 2];
142              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));                  if (!info)
143              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);                      BUG (NULL);
144          }                  sprintf (info, s, alg);
145          center_window (dlg, NULL);                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
146          SetForegroundWindow (dlg);                  free_if_alloc (info);
147          set_active_window (dlg);              }
148          return FALSE;              else
149                    SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
150          case WM_SYSCOMMAND:          }
151              if (LOWORD (wparam) == SC_CLOSE) {          else {
152                  SetDlgItemText (dlg, item_ctrl_id( c->gpg_cmd ), "");              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
153                  c->cancel = 1;              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
154                  EndDialog (dlg, TRUE);          }
155              }          center_window (dlg, NULL);
156              break;          SetForegroundWindow (dlg);
157            set_active_window (dlg);
158          case WM_COMMAND:          return FALSE;
159              switch( HIWORD( wparam ) ) {  
160              case BN_CLICKED:          case WM_SYSCOMMAND:
161                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE              if (LOWORD (wparam) == SC_CLOSE) {
162                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
163                      HWND hwnd;                  c->cancel = 1;
164                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));                  EndDialog (dlg, TRUE);
165                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));              }
166                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);              break;
167                      SetFocus (hwnd);  
168                  }          case WM_COMMAND:
169              }              switch (HIWORD (wparam)) {
170                case BN_CLICKED:
171              switch (LOWORD (wparam)) {                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
172              case IDOK:                        || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
173                  /* fixme: the item is even cached when the passphrase is not                      HWND hwnd;
174                            correct, which means that the user needs to delete all                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
175                            cached entries to continue. */                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
176                  if (c->pwd)                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
177                      burn_passphrase (&c->pwd);                      SetFocus (hwnd);
178                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));                  }
179                  if (!n) {              }
180                      c->pwd = new char[2];  
181                      if (!c->pwd)              switch (LOWORD (wparam)) {
182                          BUG (NULL);              case IDOK:  
183                      strcpy (c->pwd, "");                  /* XXX: the item is even cached when the passphrase is not
184                  }                          correct, which means that the user needs to delete all
185                  else {                          cached entries to continue. */
186                      c->pwd = new char[n+2];                  if (c->pwd)
187                      if (!c->pwd)                      burn_passphrase (&c->pwd);
188                          BUG (NULL);                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
189                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);                  if (!n) {
190                  }                      c->pwd = new char[2];
191                  res = gpgme_op_decrypt_result (c->gpg);                      if (!c->pwd)
192                  if (!res)                          BUG (NULL);
193                      res_sig = gpgme_op_sign_result (c->gpg);                      strcpy (c->pwd, "");
194                  if (reg_prefs.cache_time > 0 && !c->is_card &&                  }
195                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                  else {
196                      if (agent_get_cache (c->keyid, &item))                      c->pwd = new char[n+2];
197                          agent_unlock_cache_entry (&item);                      if (!c->pwd)
198                      else                          BUG (NULL);
199                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
200                  }                  }
201                  EndDialog (dlg, TRUE);                  res = gpgme_op_decrypt_result (c->gpg);
202                  return TRUE;                  if (!res)
203                                        res_sig = gpgme_op_sign_result (c->gpg);
204              case IDCANCEL:                  if (reg_prefs.cache_time > 0 && !c->is_card &&
205                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {
206                  c->cancel = 1;                      if (agent_get_cache (c->keyid, &item))
207                  EndDialog (dlg, FALSE);                          agent_unlock_cache_entry (&item);
208                  return FALSE;                      else
209              }                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
210              break;                  }
211      }                  c->cancel = 0;
212                        EndDialog (dlg, TRUE);
213      return FALSE;                  return TRUE;
214  }                  
215                case IDCANCEL:
216                    SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
217  /* Extract the main keyid from @pass_info.                  c->cancel = 1;
218     Return value: long main keyid or NULL for an error. */                  EndDialog (dlg, FALSE);
219  static const char*                  return FALSE;
220  parse_gpg_keyid (const char *pass_info)              }
221  {              break;
222      static char keyid[16+1];      }
223            
224      /* XXX: check for leading alpha-chars? */      return FALSE;
225      if (strlen (pass_info) < 16)  }
226          return NULL;  
227      /* the format of the desc buffer looks like this:  
228         request_keyid[16] main_keyid[16] keytype[1] keylength[4]  /* Extract the main keyid from @pass_info.
229         we use the main keyid to use only one cache entry. */     Return value: long main keyid or NULL for an error. */
230      strncpy (keyid, pass_info+17, 16);  static const char*
231      keyid[16] = 0;  parse_gpg_keyid (const char *pass_info)
232      return keyid;  {
233  }      static char keyid[16+1];
234        
235        /* XXX: check for leading alpha-chars? */
236  /* Parse the information in @uid_hint and @pass_info to generate      if (strlen (pass_info) < 16)
237     a input message for the user in @desc. */          return NULL;
238  static int      /* the format of the desc buffer looks like this:
239  parse_gpg_description (const char *uid_hint, const char *pass_info,         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
240                         char *desc, int size)         we use the main keyid to use only one cache entry. */
241  {      strncpy (keyid, pass_info+17, 16);
242      gpgme_pubkey_algo_t algo;      keyid[16] = 0;
243      char usedkey[16+1], mainkey[16+1];      return keyid;
244      char *uid, *p;  }
245      int n=0;  
246    
247      if (strlen (uid_hint) < 17) {  /* Parse the information in @uid_hint and @pass_info to generate
248          *desc = 0;     a input message for the user in @desc. */
249          return -1;  static int
250      }  parse_gpg_description (const char *uid_hint, const char *pass_info,
251                           char *desc, int size)
252      while (p = strsep ((char**)&pass_info, " ")) {  {
253          switch (n++) {      gpgme_pubkey_algo_t algo;
254          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;      char usedkey[16+1];
255          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;      char mainkey[16+1];
256          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;      char *uid, *p;
257          }      int n=0;
258      }  
259      uid_hint += 16; /* skip keyid */      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
260      uid_hint += 1;  /* space */      if (strlen (uid_hint) < 17) {
261            *desc = 0;
262      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));          return -1;
263        }
264      if (strcmp (usedkey, mainkey))  
265          _snprintf (desc, size-1,      while (p = strsep ((char**)&pass_info, " ")) {
266                     _("You need a passphrase to unlock the secret key for\n"          switch (n++) {
267                       "user: \"%s\"\n"          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
268                       "%s key, ID %s (main key ID %s)\n"),          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
269                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
270      else if (!strcmp (usedkey, mainkey))          }
271          _snprintf (desc, size-1,      }
272                     _("You need a passphrase to unlock the secret key for\n"      uid_hint += 16; /* skip keyid */
273                       "user: \"%s\"\n"      uid_hint += 1;  /* space */
274                       "%s key, ID %s\n"),  
275                       uid, get_key_pubalgo (algo), usedkey+8);      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
276      free (uid);  
277      return 0;      if (strcmp (usedkey, mainkey))
278  }          _snprintf (desc, size-1,
279                       _("You need a passphrase to unlock the secret key for\n"
280                         "user: \"%s\"\n"
281  /*                       "%s key, ID %s (main key ID %s)\n"),
282  static int inline                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
283  is_hexstring (const char * p)      else if (!strcmp (usedkey, mainkey))
284  {          _snprintf (desc, size-1,
285      size_t i;                     _("You need a passphrase to unlock the secret key for\n"
286                         "user: \"%s\"\n"
287      for (i=0; i < strlen (p); i++) {                       "%s key, ID %s\n"),
288          if (!isxdigit (p[i]))                       uid, get_key_pubalgo (algo), usedkey+8);
289              return -1;      free (uid);
290      }      return 0;
291      return 0;  }
292  }  
293  */  
294    /* Extract the serial number from the card ID @id and return it. */
295  /* Passphrase callback with the ability to support caching. */  const char*
296  gpgme_error_t  extract_serial_no (const char *id)
297  passphrase_cb (void *hook, const char *uid_hint,  {
298                 const char *passphrase_info,      static char buf[8];
299                 int prev_was_bad, int fd)      char *p;
300  {  
301      passphrase_cb_s *c = (passphrase_cb_s*)hook;      p = strchr (id, '/');
302      HANDLE hd = (HANDLE)fd;      if (!p)
303      void *item;          return NULL;
304      const char *keyid, *pass;      strncpy (buf, id+(p-id)-6, 6);
305      DWORD n;      return buf;
306      int rc;  }
307    
308      if (!c)  
309          return gpg_error (GPG_ERR_INV_ARG);  /* Passphrase callback with the ability to support caching. */
310      c->bad_pwd = prev_was_bad? 1 : 0;  gpgme_error_t
311      if (prev_was_bad && !c->cancel) {  passphrase_cb (void *hook, const char *uid_hint,
312          if (c->pwd)                 const char *passphrase_info,
313              burn_passphrase (&c->pwd);                 int prev_was_bad, int fd)
314          agent_del_cache (c->keyid);  {
315          c->pwd_init = 1;      passphrase_cb_s *c = (passphrase_cb_s*)hook;
316      }      HANDLE hd = (HANDLE)fd;
317        void *item;
318      if (passphrase_info) {      const char *keyid, *pass;
319          if (strlen (passphrase_info) < 16 &&      DWORD n;
320              !strstr (passphrase_info, "OPENPGP")) {/* assume symetric encryption. */      int rc;
321              int n=2;  
322              c->sym.sym_algo = atoi (passphrase_info);      if (!c)
323              if (c->sym.sym_algo > 9)          return gpg_error (GPG_ERR_INV_ARG);
324                  n++;      c->bad_pwd = prev_was_bad? 1 : 0;
325              /* XXX: be more strict. */      if (prev_was_bad && !c->cancel) {
326              c->sym.s2k_mode = atoi (passphrase_info+n);          if (c->pwd)
327              c->sym.s2k_hash = atoi (passphrase_info+n+2);              burn_passphrase (&c->pwd);
328          }          agent_del_cache (c->keyid);
329            c->pwd_init = 1;
330          keyid = parse_gpg_keyid (passphrase_info);      }
331          pass = agent_get_cache (keyid+8, &item);  
332          if (pass) {      if (passphrase_info) {
333              agent_unlock_cache_entry (&item);          if (strlen (passphrase_info) < 16 &&
334              c->pwd_init = 0;              !strstr (passphrase_info, "OPENPGP")) {
335              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))              /* assume symetric encryption. */
336                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);              int n=2;
337              if (!WriteFile (hd, "\n", 1, &n, NULL))              c->sym.sym_algo = atoi (passphrase_info);
338                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);              if (c->sym.sym_algo > 9)
339              return 0;                  n++;
340          }              /* XXX: be more strict. */
341      }              c->sym.s2k_mode = atoi (passphrase_info+n);
342                c->sym.s2k_hash = atoi (passphrase_info+n+2);
343      if (c->pwd_init) {          }
344          if (keyid && strlen (keyid) == 16)  
345              strcpy (c->keyid, keyid+8);          keyid = parse_gpg_keyid (passphrase_info);
346            pass = agent_get_cache (keyid+8, &item);
347          /* if @passphrase_info contains 'OPENPGP' we assume a smart card          if (pass) {
348              has been used. */              agent_unlock_cache_entry (&item);
349          if (strstr (passphrase_info, "OPENPGP")) {              c->pwd_init = 0;
350              char buf[16];              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
351              memset (buf, 0, sizeof buf);                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
352              strncpy (buf, "??", 2); /* XXX: fixme we need the serial no. */              if (!WriteFile (hd, "\n", 1, &n, NULL))
353              _snprintf (c->info, sizeof c->info-1,                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
354                         _("Please enter the PIN to unlock your secret card key\n"              return 0;
355                           "Card: %s"), buf);          }
356              c->is_card = 1;      }
357          }  
358          else if (uid_hint)      if (c->pwd_init) {
359              parse_gpg_description (uid_hint, passphrase_info,          if (keyid && strlen (keyid) == 16)
360                                     c->info, sizeof c->info - 1);              strcpy (c->keyid, keyid+8);
361          if (c->gpg_cmd == GPG_CMD_DECRYPT) {  
362              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
363                                   (HWND)c->hwnd, passphrase_callback_proc,              has been used. */
364                                   (LPARAM)c);          if (strstr (passphrase_info, "OPENPGP")) {
365          }              const char *s=passphrase_info;
366          else if (c->gpg_cmd == GPG_CMD_SIGN) {              while (s && *s && *s != 'D')
367              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,                  s++;
368                                   (HWND)c->hwnd, passphrase_callback_proc,              _snprintf (c->info, sizeof c->info-1,
369                                   (LPARAM)c);                         _("Please enter the PIN to unlock your secret card key\n"
370          }                           "Card: %s"), extract_serial_no (s));
371          if (rc == -1) {              c->is_card = 1;
372              WriteFile (hd, "\n", 1, &n, NULL);          }
373              return 0;          else if (uid_hint)
374          }              parse_gpg_description (uid_hint, passphrase_info,
375          c->pwd_init = 0;                                     c->info, sizeof c->info - 1);
376      }          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
377      if (c->cancel) {              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
378          WriteFile (hd, "\n", 1, &n, NULL);                                   (HWND)c->hwnd, passphrase_callback_proc,
379          return 0;                                   (LPARAM)c);
380      }          }
381            else if (c->gpg_cmd == GPG_CMD_SIGN) {
382      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
383      WriteFile (hd, "\n", 1, &n, NULL);                                   (HWND)c->hwnd, passphrase_callback_proc,
384      return 0;                                   (LPARAM)c);
385  }          }
386            if (rc == -1) {
387                if (!WriteFile (hd, "\n", 1, &n, NULL))
388  /* Initialize the given passphrase callback @cb with the                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
389     used gpgme context @ctx, the command @cmd and a title              return 0;
390     @title for the dialog. */          }
391  void          c->pwd_init = 0;
392  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,      }
393                         int cmd, HWND hwnd, const char *title)      if (c->cancel) {
394  {          if (!WriteFile (hd, "\n", 1, &n, NULL))
395      memset (cb, 0, sizeof *cb);              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
396      cb->gpg_cmd = cmd;          return 0;
397      cb->bad_pwd = 0;      }
398      cb->is_card = 0;  
399      cb->cancel = 0;      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);
400      cb->hwnd = hwnd;      WriteFile (hd, "\n", 1, &n, NULL);
401      cb->pwd_init = 1;      return 0;
402      free_if_alloc (cb->title);  }
403      cb->title = m_strdup (title);  
404      if (!cb->title)  
405          BUG (NULL);  /* Initialize the given passphrase callback @cb with the
406      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);     used gpgme context @ctx, the command @cmd and a title
407      cb->gpg = ctx;     @title for the dialog. */
408  }  void
409    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
410                           int cmd, HWND hwnd, const char *title)
411  /* Release a passphrase callback @ctx. */  {
412  void      memset (cb, 0, sizeof *cb);
413  release_gpg_passphrase_cb (passphrase_cb_s *ctx)      cb->gpg_cmd = cmd;
414  {      cb->bad_pwd = 0;
415      if (!ctx)      cb->is_card = 0;
416          return;      cb->cancel = 0;
417      sfree_if_alloc (ctx->pwd);      cb->hwnd = hwnd;
418      free_if_alloc (ctx->title);      cb->pwd_init = 1;
419  }      free_if_alloc (cb->title);
420        cb->title = m_strdup (title);
421        if (!cb->title)
422  /* Simple check to measure passphrase (@pass) quality.          BUG (NULL);
423     Return value: 0 on success. */      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
424  int      cb->gpg = ctx;
425  check_passwd_quality (const char *pass, int strict)  }
426  {  
427      int i, nd=0, nc=0, n;  
428    /* Release a passphrase callback @ctx. */
429      n = strlen (pass);  void
430      if (n < 8)  release_gpg_passphrase_cb (passphrase_cb_s *ctx)
431          return -1;  {
432        gpgme_recipient_t r, n;
433      for (i=0; i < n; i++) {  
434          if (isdigit (pass[i])) nd++;      if (!ctx)
435          if (isalpha (pass[i])) nc++;          return;
436      }      sfree_if_alloc (ctx->pwd);
437        free_if_alloc (ctx->title);
438      if (nd == n || nc == n)      r = ctx->recipients;
439          return -1;      while (r) {
440            n = r->next;
441      return 0;          safe_free (r->keyid);
442  }          safe_free (r);
443            r = n;
444        }
445    }
446    
447    
448    /* Simple check to measure passphrase (@pass) quality.
449       Return value: 0 on success. */
450    int
451    check_passwd_quality (const char *pass, int strict)
452    {
453        int i, nd=0, nc=0, n;
454    
455        n = strlen (pass);
456        if (n < 8)
457            return -1;
458    
459        for (i=0; i < n; i++) {
460            if (isdigit (pass[i]))
461                nd++;
462            if (isalpha (pass[i]))
463                nc++;
464        }
465    
466        /* check that the passphrase contains letters and numbers. */
467        if (nd == n || nc == n)
468            return -1;
469    
470        return 0;
471    }

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