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

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revision 33 by twoaday, Tue Oct 25 07:46:20 2005 UTC revision 85 by twoaday, Fri Nov 18 07:20:40 2005 UTC
# Line 1  Line 1 
1  /* wptPassphraseCB.cpp - GPGME Passphrase Callback  /* wptPassphraseCB.cpp - GPGME Passphrase Callback
2   *      Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz   *      Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz
3   *      Copyright (C) 2005 g10 Code GmbH   *      Copyright (C) 2005 g10 Code GmbH
4   *   *
5   * This file is part of WinPT.   * This file is part of WinPT.
6   *   *
7   * WinPT is free software; you can redistribute it and/or   * WinPT is free software; you can redistribute it and/or
8   * modify it under the terms of the GNU General Public License   * modify it under the terms of the GNU General Public License
9   * as published by the Free Software Foundation; either version 2   * as published by the Free Software Foundation; either version 2
10   * of the License, or (at your option) any later version.   * of the License, or (at your option) any later version.
11   *     *  
12   * WinPT is distributed in the hope that it will be useful,   * WinPT is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * General Public License for more details.   * General Public License for more details.
16   *   *
17   * You should have received a copy of the GNU General Public License   * You should have received a copy of the GNU General Public License
18   * along with WinPT; if not, write to the Free Software Foundation,   * along with WinPT; if not, write to the Free Software Foundation,
19   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20   */   */
21    
22  #include <windows.h>  #ifdef HAVE_CONFIG_H
23  #include <ctype.h>  #include <config.h>
24    #endif
25  #include "../resource.h"  
26  #include "wptNLS.h"  #include <windows.h>
27  #include "wptW32API.h"  #include <ctype.h>
28  #include "wptVersion.h"  
29  #include "wptGPG.h"  #include "resource.h"
30  #include "wptCommonCtl.h"  #include "wptNLS.h"
31  #include "wptContext.h"  #include "wptW32API.h"
32  #include "wptDlgs.h"  #include "wptVersion.h"
33  #include "wptUTF8.h"  #include "wptGPG.h"
34  #include "wptErrors.h"  #include "wptCommonCtl.h"
35  #include "wptTypes.h"  #include "wptContext.h"
36  #include "wptKeyList.h"  #include "wptDlgs.h"
37  #include "wptAgent.h"  #include "wptUTF8.h"
38  #include "wptRegistry.h"  #include "wptErrors.h"
39    #include "wptTypes.h"
40  const char* get_symkey_algo (int algo);  #include "wptKeylist.h"
41    #include "wptAgent.h"
42  #define item_ctrl_id( cmd ) \  #include "wptRegistry.h"
43      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)  
44    const char* get_symkey_algo (int algo);
45  #define item_ctrl_id2(cmd) \  
46      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)  #define item_ctrl_id( cmd ) \
47        ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
48    
49  /* 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      wipememory (pass, 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      gpgme_recipient_t recip, r;      static passphrase_cb_s *c;
69      void *ctx = NULL, *item;      gpgme_decrypt_result_t res=NULL;
70      const char *id;      gpgme_sign_result_t res_sig=NULL;
71      char *info;      gpgme_key_t key;
72      int n;      gpgme_recipient_t recip=NULL, r;
73        void *item;
74      switch (msg) {      const char *id;
75      case WM_INITDIALOG:      char *info;
76          c = (passphrase_cb_s *)lparam;      int n;
77          if (!c)  
78              BUG (0);      switch (msg) {
79          SetWindowText (dlg, c->title);      case WM_INITDIALOG:
80          if (c->gpg_cmd == GPG_CMD_DECRYPT) {          c = (passphrase_cb_s *)lparam;
81              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,          if (!c)
82                              _("Encrypted with the following public key(s)"));              BUG (0);
83              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);          SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
84          }          SetWindowText (dlg, c->title);
85          else if (c->gpg_cmd == GPG_CMD_SIGN)          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
86              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
87          if (c->recipients)                              _("Encrypted with the following public key(s)"));
88              recip = c->recipients; /* recipients were already extracted. */              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
89          else {          }
90              /* XXX: not all ENCRYPT_TO entries are listed here. */          else if (c->gpg_cmd == GPG_CMD_SIGN)
91              res = gpgme_op_decrypt_result (c->gpg);              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
92              if (res->recipients)          if (c->recipients)
93                  recip = res->recipients;              recip = c->recipients; /* recipients were already extracted. */
94          }          else {
95          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {              /* XXX: not all ENCRYPT_TO entries are listed here. */
96              for (r = res->recipients; r; r = r->next) {              res = gpgme_op_decrypt_result (c->gpg);
97                  get_pubkey (r->keyid, &key);              if (res && res->recipients)
98                  if (key) {                  recip = res->recipients;
99                      char *uid;          }
100                      id = key->uids->name;          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
101                      if (!id)              for (r = res->recipients; r; r = r->next) {
102                          id = _("Invalid User ID");                  get_pubkey (r->keyid, &key);
103                      uid = utf8_to_wincp (id, strlen (id));                  if (key) {
104                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1                      char *uid;
105                                       + strlen (key->uids->email)+1];                      id = key->uids->name;
106                      if (!info)                      if (!id)
107                          BUG (NULL);                          id = _("Invalid User ID");
108                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,                      uid = utf8_to_wincp (id, strlen (id));
109                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1
110                      free (uid);                                       + strlen (key->uids->email)+1];
111                                            if (!info)
112                  }                          BUG (NULL);
113                  else {                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,
114                      info = new char [32 + strlen (r->keyid)+1 + 4];                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
115                      if (!info)                      free (uid);
116                          BUG (NULL);                      
117                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),                  }
118                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                  else {
119                  }                      info = new char [32 + strlen (r->keyid)+1 + 4];
120                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);                      if (!info)
121                  free_if_alloc (info);                          BUG (NULL);
122              }                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
123          }                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
124          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                  }
125              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
126          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?                  free_if_alloc (info);
127                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,              }
128                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :          }
129                          _("Please enter your passphrase"));          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
130          if (c->gpg_cmd == GPG_CMD_DECRYPT) {              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
131              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
132              if (res && !res->recipients) {                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
133                  const char *s = _("Symmetric encryption.\n"                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
134                                    "%s encrypted data.");                          _("Please enter your passphrase"));
135                  const char *alg = get_symkey_algo (c->sym.sym_algo);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
136                  info = new char[strlen (s) + strlen (alg) + 2];              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
137                  if (!info)              if (res && !res->recipients) {
138                      BUG (NULL);                  const char *s = _("Symmetric encryption.\n"
139                  sprintf (info, s, alg);                                    "%s encrypted data.");
140                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);                  const char *alg = get_symkey_algo (c->sym.sym_algo);
141                  free_if_alloc (info);                  info = new char[strlen (s) + strlen (alg) + 2];
142              }                  if (!info)
143              else                      BUG (NULL);
144                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                  sprintf (info, s, alg);
145          }                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
146          else {                  free_if_alloc (info);
147              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));              }
148              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);              else
149          }                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
150          center_window (dlg, NULL);          }
151          SetForegroundWindow (dlg);          else {
152          set_active_window (dlg);              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
153          return FALSE;              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
154            }
155          case WM_SYSCOMMAND:          center_window (dlg, NULL);
156              if (LOWORD (wparam) == SC_CLOSE) {          SetForegroundWindow (dlg);
157                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");          set_active_window (dlg);
158                  c->cancel = 1;          return FALSE;
159                  EndDialog (dlg, TRUE);  
160              }          case WM_SYSCOMMAND:
161              break;              if (LOWORD (wparam) == SC_CLOSE) {
162                    SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
163          case WM_COMMAND:                  c->cancel = 1;
164              switch (HIWORD (wparam)) {                  EndDialog (dlg, TRUE);
165              case BN_CLICKED:              }
166                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE              break;
167                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {  
168                      HWND hwnd;          case WM_COMMAND:
169                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));              switch (HIWORD (wparam)) {
170                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));              case BN_CLICKED:
171                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
172                      SetFocus (hwnd);                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
173                  }                      HWND hwnd;
174              }                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
175                        hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
176              switch (LOWORD (wparam)) {                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
177              case IDOK:                        SetFocus (hwnd);
178                  /* XXX: the item is even cached when the passphrase is not                  }
179                          correct, which means that the user needs to delete all              }
180                          cached entries to continue. */  
181                  if (c->pwd)              switch (LOWORD (wparam)) {
182                      burn_passphrase (&c->pwd);              case IDOK:  
183                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));                  /* XXX: the item is even cached when the passphrase is not
184                  if (!n) {                          correct, which means that the user needs to delete all
185                      c->pwd = new char[2];                          cached entries to continue. */
186                      if (!c->pwd)                  if (c->pwd)
187                          BUG (NULL);                      burn_passphrase (&c->pwd);
188                      strcpy (c->pwd, "");                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
189                  }                  if (!n) {
190                  else {                      c->pwd = new char[2];
191                      c->pwd = new char[n+2];                      if (!c->pwd)
192                      if (!c->pwd)                          BUG (NULL);
193                          BUG (NULL);                      strcpy (c->pwd, "");
194                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);                  }
195                  }                  else {
196                  res = gpgme_op_decrypt_result (c->gpg);                      c->pwd = new char[n+2];
197                  if (!res)                      if (!c->pwd)
198                      res_sig = gpgme_op_sign_result (c->gpg);                          BUG (NULL);
199                  if (reg_prefs.cache_time > 0 && !c->is_card &&                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
200                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                  }
201                      if (agent_get_cache (c->keyid, &item))                  res = gpgme_op_decrypt_result (c->gpg);
202                          agent_unlock_cache_entry (&item);                  if (!res)
203                      else                      res_sig = gpgme_op_sign_result (c->gpg);            
204                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                  if (reg_prefs.cache_time > 0 && !c->is_card &&
205                  }                      (res || res_sig)) {
206                  c->cancel = 0;                      if (agent_get_cache (c->keyid, &item))                      
207                  EndDialog (dlg, TRUE);                          agent_unlock_cache_entry (&item);
208                  return TRUE;                      else
209                                            agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
210              case IDCANCEL:                  }
211                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");                  c->cancel = 0;
212                  c->cancel = 1;                  EndDialog (dlg, TRUE);
213                  EndDialog (dlg, FALSE);                  return TRUE;
214                  return FALSE;                  
215              }              case IDCANCEL:
216              break;                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
217      }                  c->cancel = 1;
218                        EndDialog (dlg, FALSE);
219      return FALSE;                  return FALSE;
220  }              }
221                break;
222        }
223  /* Extract the main keyid from @pass_info.      
224     Return value: long main keyid or NULL for an error. */      return FALSE;
225  static const char*  }
226  parse_gpg_keyid (const char *pass_info)  
227  {  
228      static char keyid[16+1];  /* Extract the main keyid from @pass_info.
229           Return value: long main keyid or NULL for an error. */
230      /* XXX: check for leading alpha-chars? */  static const char*
231      if (strlen (pass_info) < 16)  parse_gpg_keyid (const char *pass_info)
232          return NULL;  {
233      /* the format of the desc buffer looks like this:      static char keyid[16+1];
234         request_keyid[16] main_keyid[16] keytype[1] keylength[4]      
235         we use the main keyid to use only one cache entry. */      /* XXX: check for leading alpha-chars? */
236      strncpy (keyid, pass_info+17, 16);      if (strlen (pass_info) < 16) {
237      keyid[16] = 0;          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
238      return keyid;          return NULL;
239  }      }
240        /* the format of the desc buffer looks like this:
241           request_keyid[16] main_keyid[16] keytype[1] keylength[4]
242  /* Parse the information in @uid_hint and @pass_info to generate         we use the main keyid to use only one cache entry. */
243     a input message for the user in @desc. */      strncpy (keyid, pass_info+17, 16);
244  static int      keyid[16] = 0;
245  parse_gpg_description (const char *uid_hint, const char *pass_info,      return keyid;
246                         char *desc, int size)  }
247  {  
248      gpgme_pubkey_algo_t algo;  
249      char usedkey[16+1];  /* Parse the information in @uid_hint and @pass_info to generate
250      char mainkey[16+1];     a input message for the user in @desc. */
251      char *uid, *p;  static int
252      int n=0;  parse_gpg_description (const char *uid_hint, const char *pass_info,
253                           char *desc, int size)
254      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */  {
255      if (strlen (uid_hint) < 17) {      gpgme_pubkey_algo_t algo;
256          *desc = 0;      char usedkey[16+1];
257          return -1;      char mainkey[16+1];
258      }      char *uid, *p;
259        int n=0;
260      while (p = strsep ((char**)&pass_info, " ")) {  
261          switch (n++) {      algo = (gpgme_pubkey_algo_t)0;
262          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
263          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;      if (strlen (uid_hint) < 17) {
264          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;          *desc = 0;
265          }          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
266      }          return -1;
267      uid_hint += 16; /* skip keyid */      }
268      uid_hint += 1;  /* space */  
269        while (p = strsep ((char**)&pass_info, " ")) {
270      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));          switch (n++) {
271            case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
272      if (strcmp (usedkey, mainkey))          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
273          _snprintf (desc, size-1,          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
274                     _("You need a passphrase to unlock the secret key for\n"          }
275                       "user: \"%s\"\n"      }
276                       "%s key, ID %s (main key ID %s)\n"),      uid_hint += 16; /* skip keyid */
277                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);      uid_hint += 1;  /* space */
278      else if (!strcmp (usedkey, mainkey))  
279          _snprintf (desc, size-1,      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
280                     _("You need a passphrase to unlock the secret key for\n"  
281                       "user: \"%s\"\n"      if (strcmp (usedkey, mainkey))
282                       "%s key, ID %s\n"),          _snprintf (desc, size-1,
283                       uid, get_key_pubalgo (algo), usedkey+8);                     _("You need a passphrase to unlock the secret key for\n"
284      free (uid);                       "user: \"%s\"\n"
285      return 0;                       "%s key, ID %s (main key ID %s)\n"),
286  }                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
287        else if (!strcmp (usedkey, mainkey))
288            _snprintf (desc, size-1,
289  /* Extract the serial number from the card ID @id and return it. */                     _("You need a passphrase to unlock the secret key for\n"
290  const char*                       "user: \"%s\"\n"
291  extract_serial_no (const char *id)                       "%s key, ID %s\n"),
292  {                       uid, get_key_pubalgo (algo), usedkey+8);
293      static char buf[8];      free (uid);
294      char *p;      return 0;
295    }
296      p = strchr (id, '/');  
297      if (!p)  
298          return NULL;  /* Extract the serial number from the card ID @id and return it. */
299      strncpy (buf, id+(p-id)-6, 6);  const char*
300      return buf;  extract_serial_no (const char *id)
301  }  {
302        static char buf[8];
303        char *p;
304  /* Passphrase callback with the ability to support caching. */  
305  gpgme_error_t      p = strchr (id, '/');
306  passphrase_cb (void *hook, const char *uid_hint,      if (!p) {
307                 const char *passphrase_info,          log_debug ("extract_serial_no: error '%s'\r\n", id);
308                 int prev_was_bad, int fd)          return NULL;
309  {      }
310      passphrase_cb_s *c = (passphrase_cb_s*)hook;      strncpy (buf, id+(p-id)-6, 6);
311      HANDLE hd = (HANDLE)fd;      return buf;
312      void *item;  }
313      const char *keyid, *pass;  
314      DWORD n;  
315      int rc;  /* Passphrase callback with the ability to support caching. */
316    gpgme_error_t
317      if (!c)  passphrase_cb (void *hook, const char *uid_hint,
318          return gpg_error (GPG_ERR_INV_ARG);                 const char *passphrase_info,
319      c->bad_pwd = prev_was_bad? 1 : 0;                 int prev_was_bad, int fd)
320      if (prev_was_bad && !c->cancel) {  {
321          if (c->pwd)      passphrase_cb_s *c = (passphrase_cb_s*)hook;
322              burn_passphrase (&c->pwd);      HANDLE hd = (HANDLE)fd;
323          agent_del_cache (c->keyid);      void *item;
324          c->pwd_init = 1;      const char *keyid=NULL, *pass;
325      }      DWORD n;
326        int rc = 0;
327      if (passphrase_info) {  
328          if (strlen (passphrase_info) < 16 &&      if (!c) {
329              !strstr (passphrase_info, "OPENPGP")) {          log_debug ("passphrase_cb: error '!c'\r\n");
330              /* assume symetric encryption. */          return gpg_error (GPG_ERR_INV_ARG);
331              int n=2;      }
332              c->sym.sym_algo = atoi (passphrase_info);      c->bad_pwd = prev_was_bad? 1 : 0;
333              if (c->sym.sym_algo > 9)      if (prev_was_bad && !c->cancel) {
334                  n++;          if (c->pwd)
335              /* XXX: be more strict. */              burn_passphrase (&c->pwd);
336              c->sym.s2k_mode = atoi (passphrase_info+n);          agent_del_cache (c->keyid);
337              c->sym.s2k_hash = atoi (passphrase_info+n+2);          c->pwd_init = 1;
338          }      }
339    
340          keyid = parse_gpg_keyid (passphrase_info);      if (passphrase_info) {
341          pass = agent_get_cache (keyid+8, &item);          if (strlen (passphrase_info) < 16 &&
342          if (pass) {              !strstr (passphrase_info, "OPENPGP")) {
343              agent_unlock_cache_entry (&item);              /* assume symetric encryption. */
344              c->pwd_init = 0;              int pos=2;
345              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))              c->sym.sym_algo = atoi (passphrase_info);
346                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);              if (c->sym.sym_algo > 9)
347              if (!WriteFile (hd, "\n", 1, &n, NULL))                  pos++;
348                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);              /* XXX: be more strict. */
349              return 0;              c->sym.s2k_mode = atoi (passphrase_info+pos);
350          }              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
351      }          }
352    
353      if (c->pwd_init) {          keyid = parse_gpg_keyid (passphrase_info);
354          if (keyid && strlen (keyid) == 16)          pass = agent_get_cache (keyid+8, &item);        
355              strcpy (c->keyid, keyid+8);          if (pass) {
356                agent_unlock_cache_entry (&item);
357          /* if @passphrase_info contains 'OPENPGP' we assume a smart card              c->pwd_init = 0;
358              has been used. */              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
359          if (strstr (passphrase_info, "OPENPGP")) {                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
360              const char *s=passphrase_info;              if (!WriteFile (hd, "\n", 1, &n, NULL))
361              while (s && *s && *s != 'D')                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
362                  s++;              return 0;
363              _snprintf (c->info, sizeof c->info-1,          }
364                         _("Please enter the PIN to unlock your secret card key\n"      }
365                           "Card: %s"), extract_serial_no (s));  
366              c->is_card = 1;      if (c->pwd_init) {
367          }          if (keyid && strlen (keyid) == 16)
368          else if (uid_hint)              strcpy (c->keyid, keyid+8);
369              parse_gpg_description (uid_hint, passphrase_info,  
370                                     c->info, sizeof c->info - 1);          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
371          if (c->gpg_cmd == GPG_CMD_DECRYPT) {              has been used. */
372              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,          if (strstr (passphrase_info, "OPENPGP")) {
373                                   (HWND)c->hwnd, passphrase_callback_proc,              const char *s=passphrase_info;
374                                   (LPARAM)c);              while (s && *s && *s != 'D')
375          }                  s++;
376          else if (c->gpg_cmd == GPG_CMD_SIGN) {              _snprintf (c->info, sizeof c->info-1,
377              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,                         _("Please enter the PIN to unlock your secret card key\n"
378                                   (HWND)c->hwnd, passphrase_callback_proc,                           "Card: %s"), extract_serial_no (s));
379                                   (LPARAM)c);              c->is_card = 1;
380          }          }
381          if (rc == -1) {          else if (uid_hint)
382              if (!WriteFile (hd, "\n", 1, &n, NULL))              parse_gpg_description (uid_hint, passphrase_info,
383                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);                                     c->info, sizeof c->info - 1);
384              return 0;          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
385          }              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
386          c->pwd_init = 0;                                   (HWND)c->hwnd, passphrase_callback_proc,
387      }                                   (LPARAM)c);
388      if (c->cancel) {          }
389          if (!WriteFile (hd, "\n", 1, &n, NULL))          else if (c->gpg_cmd == GPG_CMD_SIGN) {
390              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
391          return 0;                                   (HWND)c->hwnd, passphrase_callback_proc,
392      }                                   (LPARAM)c);
393            }
394      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);          if (rc == -1) {
395      WriteFile (hd, "\n", 1, &n, NULL);              if (!WriteFile (hd, "\n", 1, &n, NULL))
396      return 0;                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
397  }              return 0;
398            }
399            c->pwd_init = 0;
400  /* Initialize the given passphrase callback @cb with the      }
401     used gpgme context @ctx, the command @cmd and a title      if (c->cancel) {
402     @title for the dialog. */          if (!WriteFile (hd, "\n", 1, &n, NULL))
403  void              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
404  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,          return 0;
405                         int cmd, HWND hwnd, const char *title)      }
406  {  
407      memset (cb, 0, sizeof *cb);      if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
408      cb->gpg_cmd = cmd;          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
409      cb->bad_pwd = 0;      if (!WriteFile (hd, "\n", 1, &n, NULL))
410      cb->is_card = 0;          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
411      cb->cancel = 0;      return 0;
412      cb->hwnd = hwnd;  }
413      cb->pwd_init = 1;  
414      free_if_alloc (cb->title);  
415      cb->title = m_strdup (title);  /* Initialize the given passphrase callback @cb with the
416      if (!cb->title)     used gpgme context @ctx, the command @cmd and a title
417          BUG (NULL);     @title for the dialog. */
418      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);  void
419      cb->gpg = ctx;  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
420  }                         int cmd, HWND hwnd, const char *title)
421    {
422        memset (cb, 0, sizeof *cb);
423  /* Release a passphrase callback @ctx. */      cb->gpg_cmd = cmd;
424  void      cb->bad_pwd = 0;
425  release_gpg_passphrase_cb (passphrase_cb_s *ctx)      cb->is_card = 0;
426  {      cb->cancel = 0;
427      gpgme_recipient_t r, n;      cb->hwnd = hwnd;
428        cb->pwd_init = 1;
429      if (!ctx)      free_if_alloc (cb->title);
430          return;      cb->title = m_strdup (title);
431      sfree_if_alloc (ctx->pwd);      if (!cb->title)
432      free_if_alloc (ctx->title);          BUG (NULL);
433      r = ctx->recipients;      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
434      while (r) {      cb->gpg = ctx;
435          n = r->next;  }
436          safe_free (r->keyid);  
437          safe_free (r);  
438          r = n;  /* Release a passphrase callback @ctx. */
439      }  void
440  }  release_gpg_passphrase_cb (passphrase_cb_s *ctx)
441    {
442        gpgme_recipient_t r, n;
443  /* Simple check to measure passphrase (@pass) quality.  
444     Return value: 0 on success. */      if (!ctx)
445  int          return;
446  check_passwd_quality (const char *pass, int strict)      sfree_if_alloc (ctx->pwd);
447  {      free_if_alloc (ctx->title);
448      int i, nd=0, nc=0, n;      r = ctx->recipients;
449        while (r) {
450      n = strlen (pass);          n = r->next;
451      if (n < 8)          safe_free (r->keyid);
452          return -1;          safe_free (r);
453            r = n;
454      for (i=0; i < n; i++) {      }
455          if (isdigit (pass[i]))  }
456              nd++;  
457          if (isalpha (pass[i]))  
458              nc++;  /* Simple check to measure passphrase (@pass) quality.
459      }     Return value: 0 on success. */
460    int
461      /* check that the passphrase contains letters and numbers. */  check_passwd_quality (const char *pass, int strict)
462      if (nd == n || nc == n)  {
463          return -1;      int i, nd=0, nc=0, n;
464    
465      return 0;      n = strlen (pass);
466  }      if (n < 8)
467            return -1;
468    
469        for (i=0; i < n; i++) {
470            if (isdigit (pass[i]))
471                nd++;
472            if (isalpha (pass[i]))
473                nc++;
474        }
475    
476        /* check that the passphrase contains letters and numbers. */
477        if (nd == n || nc == n)
478            return -1;
479    
480        return 0;
481    }
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