/[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 95 by twoaday, Thu Nov 24 12:09:28 2005 UTC
# Line 1  Line 1 
1  /* wptPassphraseCB.cpp - GPGME Passphrase Callback  /* wptPassphraseCB.cpp - GPGME Passphrase Callback
2   *      Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz   *      Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz
3   *      Copyright (C) 2005 g10 Code GmbH   *      Copyright (C) 2005 g10 Code GmbH
4   *   *
5   * This file is part of WinPT.   * This file is part of WinPT.
6   *   *
7   * WinPT is free software; you can redistribute it and/or   * WinPT is free software; you can redistribute it and/or
8   * modify it under the terms of the GNU General Public License   * modify it under the terms of the GNU General Public License
9   * as published by the Free Software Foundation; either version 2   * as published by the Free Software Foundation; either version 2
10   * of the License, or (at your option) any later version.   * of the License, or (at your option) any later version.
11   *     *  
12   * WinPT is distributed in the hope that it will be useful,   * WinPT is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * General Public License for more details.   * General Public License for more details.
16   *   *
17   * You should have received a copy of the GNU General Public License   * You should have received a copy of the GNU General Public License
18   * along with WinPT; if not, write to the Free Software Foundation,   * along with WinPT; if not, write to the Free Software Foundation,
19   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20   */   */
21    
22  #include <windows.h>  #ifdef HAVE_CONFIG_H
23  #include <ctype.h>  #include <config.h>
24    #endif
25  #include "../resource.h"  
26  #include "wptNLS.h"  #include <windows.h>
27  #include "wptW32API.h"  #include <ctype.h>
28  #include "wptVersion.h"  
29  #include "wptGPG.h"  #include "resource.h"
30  #include "wptCommonCtl.h"  #include "wptNLS.h"
31  #include "wptContext.h"  #include "wptW32API.h"
32  #include "wptDlgs.h"  #include "wptVersion.h"
33  #include "wptUTF8.h"  #include "wptGPG.h"
34  #include "wptErrors.h"  #include "wptCommonCtl.h"
35  #include "wptTypes.h"  #include "wptContext.h"
36  #include "wptKeyList.h"  #include "wptDlgs.h"
37  #include "wptAgent.h"  #include "wptUTF8.h"
38  #include "wptRegistry.h"  #include "wptErrors.h"
39    #include "wptTypes.h"
40  const char* get_symkey_algo (int algo);  #include "wptKeylist.h"
41    #include "wptAgent.h"
42  #define item_ctrl_id( cmd ) \  #include "wptRegistry.h"
43      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)  
44    const char* get_symkey_algo (int algo);
45  #define item_ctrl_id2(cmd) \  
46      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)  #define item_ctrl_id( cmd ) \
47        ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
48    
49  /* 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);              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
92              if (res->recipients)              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
93                  recip = res->recipients;          }
94          }          if (c->recipients)
95          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {              recip = c->recipients; /* recipients were already extracted. */
96              for (r = res->recipients; r; r = r->next) {          else {
97                  get_pubkey (r->keyid, &key);              /* XXX: not all ENCRYPT_TO entries are listed here. */
98                  if (key) {              res = gpgme_op_decrypt_result (c->gpg);
99                      char *uid;              if (res && res->recipients)
100                      id = key->uids->name;                  recip = res->recipients;
101                      if (!id)          }
102                          id = _("Invalid User ID");          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
103                      uid = utf8_to_wincp (id, strlen (id));              for (r = res->recipients; r; r = r->next) {
104                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1                  get_pubkey (r->keyid, &key);
105                                       + strlen (key->uids->email)+1];                  if (key) {
106                      if (!info)                      char *uid;
107                          BUG (NULL);                      id = key->uids->name;
108                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,                      if (!id)
109                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                          id = _("Invalid User ID");
110                      free (uid);                      uid = utf8_to_wincp (id, strlen (id));
111                                            info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1
112                  }                                       + strlen (key->uids->email)+1];
113                  else {                      if (!info)
114                      info = new char [32 + strlen (r->keyid)+1 + 4];                          BUG (NULL);
115                      if (!info)                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,
116                          BUG (NULL);                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
117                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),                      free (uid);
118                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                      
119                  }                  }
120                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);                  else {
121                  free_if_alloc (info);                      info = new char [32 + strlen (r->keyid)+1 + 4];
122              }                      if (!info)
123          }                          BUG (NULL);
124          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
125              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
126          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?                  }
127                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
128                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :                  free_if_alloc (info);
129                          _("Please enter your passphrase"));              }
130          if (c->gpg_cmd == GPG_CMD_DECRYPT) {          }
131              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
132              if (res && !res->recipients) {              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
133                  const char *s = _("Symmetric encryption.\n"          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
134                                    "%s encrypted data.");                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
135                  const char *alg = get_symkey_algo (c->sym.sym_algo);                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
136                  info = new char[strlen (s) + strlen (alg) + 2];                          _("Please enter your passphrase"));
137                  if (!info)          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
138                      BUG (NULL);              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
139                  sprintf (info, s, alg);              if (res && !res->recipients) {
140                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);                  const char *s = _("Symmetric encryption.\n"
141                  free_if_alloc (info);                                    "%s encrypted data.");
142              }                  const char *alg = get_symkey_algo (c->sym.sym_algo);
143              else                  info = new char[strlen (s) + strlen (alg) + 2];
144                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                  if (!info)
145          }                      BUG (NULL);
146          else {                  sprintf (info, s, alg);
147              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
148              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);                  free_if_alloc (info);
149          }              }
150          center_window (dlg, NULL);              else
151          SetForegroundWindow (dlg);                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
152          set_active_window (dlg);          }
153          return FALSE;          else {
154                SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
155          case WM_SYSCOMMAND:              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
156              if (LOWORD (wparam) == SC_CLOSE) {          }
157                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");          center_window (dlg, NULL);
158                  c->cancel = 1;          SetForegroundWindow (dlg);
159                  EndDialog (dlg, TRUE);          set_active_window (dlg);
160              }          return FALSE;
161              break;  
162            case WM_SYSCOMMAND:
163          case WM_COMMAND:              if (LOWORD (wparam) == SC_CLOSE) {
164              switch (HIWORD (wparam)) {                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
165              case BN_CLICKED:                  c->cancel = 1;
166                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE                  EndDialog (dlg, TRUE);
167                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {              }
168                      HWND hwnd;              break;
169                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));  
170                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));          case WM_COMMAND:
171                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);              switch (HIWORD (wparam)) {
172                      SetFocus (hwnd);              case BN_CLICKED:
173                  }                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
174              }                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
175                        HWND hwnd;
176              switch (LOWORD (wparam)) {                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
177              case IDOK:                        hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
178                  /* XXX: the item is even cached when the passphrase is not                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
179                          correct, which means that the user needs to delete all                      SetFocus (hwnd);
180                          cached entries to continue. */                  }
181                  if (c->pwd)              }
182                      burn_passphrase (&c->pwd);  
183                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));              switch (LOWORD (wparam)) {
184                  if (!n) {              case IDOK:  
185                      c->pwd = new char[2];                  /* XXX: the item is even cached when the passphrase is not
186                      if (!c->pwd)                          correct, which means that the user needs to delete all
187                          BUG (NULL);                          cached entries to continue. */
188                      strcpy (c->pwd, "");                  if (c->pwd)
189                  }                      burn_passphrase (&c->pwd);
190                  else {                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
191                      c->pwd = new char[n+2];                  if (!n) {
192                      if (!c->pwd)                      c->pwd = new char[2];
193                          BUG (NULL);                      if (!c->pwd)
194                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);                          BUG (NULL);
195                  }                      strcpy (c->pwd, "");
196                  res = gpgme_op_decrypt_result (c->gpg);                  }
197                  if (!res)                  else {
198                      res_sig = gpgme_op_sign_result (c->gpg);                      c->pwd = new char[n+2];
199                  if (reg_prefs.cache_time > 0 && !c->is_card &&                      if (!c->pwd)
200                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                          BUG (NULL);
201                      if (agent_get_cache (c->keyid, &item))                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
202                          agent_unlock_cache_entry (&item);                  }
203                      else                  res = gpgme_op_decrypt_result (c->gpg);
204                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                  if (!res)
205                  }                      res_sig = gpgme_op_sign_result (c->gpg);            
206                  c->cancel = 0;                  if (reg_prefs.cache_time > 0 && !c->is_card &&
207                  EndDialog (dlg, TRUE);                      (res || res_sig)) {
208                  return TRUE;                      if (agent_get_cache (c->keyid, &item))                      
209                                            agent_unlock_cache_entry (&item);
210              case IDCANCEL:                      else
211                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
212                  c->cancel = 1;                  }
213                  EndDialog (dlg, FALSE);                  c->cancel = 0;
214                  return FALSE;                  EndDialog (dlg, TRUE);
215              }                  return TRUE;
216              break;                  
217      }              case IDCANCEL:
218                        SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
219      return FALSE;                  c->cancel = 1;
220  }                  EndDialog (dlg, FALSE);
221                    return FALSE;
222                }
223  /* Extract the main keyid from @pass_info.              break;
224     Return value: long main keyid or NULL for an error. */      }
225  static const char*      
226  parse_gpg_keyid (const char *pass_info)      return FALSE;
227  {  }
228      static char keyid[16+1];  
229        
230      /* XXX: check for leading alpha-chars? */  /* Extract the main keyid from @pass_info.
231      if (strlen (pass_info) < 16)     Return value: long main keyid or NULL for an error. */
232          return NULL;  static const char*
233      /* the format of the desc buffer looks like this:  parse_gpg_keyid (const char *pass_info)
234         request_keyid[16] main_keyid[16] keytype[1] keylength[4]  {
235         we use the main keyid to use only one cache entry. */      static char keyid[16+1];
236      strncpy (keyid, pass_info+17, 16);      
237      keyid[16] = 0;      /* XXX: check for leading alpha-chars? */
238      return keyid;      if (strlen (pass_info) < 16) {
239  }          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
240            return NULL;
241        }
242  /* Parse the information in @uid_hint and @pass_info to generate      /* the format of the desc buffer looks like this:
243     a input message for the user in @desc. */         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
244  static int         we use the main keyid to use only one cache entry. */
245  parse_gpg_description (const char *uid_hint, const char *pass_info,      strncpy (keyid, pass_info+17, 16);
246                         char *desc, int size)      keyid[16] = 0;
247  {      return keyid;
248      gpgme_pubkey_algo_t algo;  }
249      char usedkey[16+1];  
250      char mainkey[16+1];  
251      char *uid, *p;  /* Parse the information in @uid_hint and @pass_info to generate
252      int n=0;     a input message for the user in @desc. */
253    static int
254      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */  parse_gpg_description (const char *uid_hint, const char *pass_info,
255      if (strlen (uid_hint) < 17) {                         char *desc, int size)
256          *desc = 0;  {
257          return -1;      gpgme_pubkey_algo_t algo;
258      }      char usedkey[16+1];
259        char mainkey[16+1];
260      while (p = strsep ((char**)&pass_info, " ")) {      char *uid, *p;
261          switch (n++) {      int n=0;
262          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;  
263          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;      algo = (gpgme_pubkey_algo_t)0;
264          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
265          }      if (strlen (uid_hint) < 17) {
266      }          *desc = 0;
267      uid_hint += 16; /* skip keyid */          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
268      uid_hint += 1;  /* space */          return -1;
269        }
270      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));  
271        while (p = strsep ((char**)&pass_info, " ")) {
272      if (strcmp (usedkey, mainkey))          switch (n++) {
273          _snprintf (desc, size-1,          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
274                     _("You need a passphrase to unlock the secret key for\n"          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
275                       "user: \"%s\"\n"          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
276                       "%s key, ID %s (main key ID %s)\n"),          }
277                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);      }
278      else if (!strcmp (usedkey, mainkey))      uid_hint += 16; /* skip keyid */
279          _snprintf (desc, size-1,      uid_hint += 1;  /* space */
280                     _("You need a passphrase to unlock the secret key for\n"  
281                       "user: \"%s\"\n"      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
282                       "%s key, ID %s\n"),  
283                       uid, get_key_pubalgo (algo), usedkey+8);      if (strcmp (usedkey, mainkey))
284      free (uid);          _snprintf (desc, size-1,
285      return 0;                     _("You need a passphrase to unlock the secret key for\n"
286  }                       "user: \"%s\"\n"
287                         "%s key, ID %s (main key ID %s)\n"),
288                       uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
289  /* Extract the serial number from the card ID @id and return it. */      else if (!strcmp (usedkey, mainkey))
290  const char*          _snprintf (desc, size-1,
291  extract_serial_no (const char *id)                     _("You need a passphrase to unlock the secret key for\n"
292  {                       "user: \"%s\"\n"
293      static char buf[8];                       "%s key, ID %s\n"),
294      char *p;                       uid, get_key_pubalgo (algo), usedkey+8);
295        free (uid);
296      p = strchr (id, '/');      return 0;
297      if (!p)  }
298          return NULL;  
299      strncpy (buf, id+(p-id)-6, 6);  
300      return buf;  /* Extract the serial number from the card ID @id and return it. */
301  }  const char*
302    extract_serial_no (const char *id)
303    {
304  /* Passphrase callback with the ability to support caching. */      static char buf[8];
305  gpgme_error_t      char *p;
306  passphrase_cb (void *hook, const char *uid_hint,  
307                 const char *passphrase_info,      p = strchr (id, '/');
308                 int prev_was_bad, int fd)      if (!p) {
309  {          log_debug ("extract_serial_no: error '%s'\r\n", id);
310      passphrase_cb_s *c = (passphrase_cb_s*)hook;          return NULL;
311      HANDLE hd = (HANDLE)fd;      }
312      void *item;      strncpy (buf, id+(p-id)-6, 6);
313      const char *keyid, *pass;      return buf;
314      DWORD n;  }
315      int rc;  
316    
317      if (!c)  /* Passphrase callback with the ability to support caching. */
318          return gpg_error (GPG_ERR_INV_ARG);  gpgme_error_t
319      c->bad_pwd = prev_was_bad? 1 : 0;  passphrase_cb (void *hook, const char *uid_hint,
320      if (prev_was_bad && !c->cancel) {                 const char *passphrase_info,
321          if (c->pwd)                 int prev_was_bad, int fd)
322              burn_passphrase (&c->pwd);  {
323          agent_del_cache (c->keyid);      passphrase_cb_s *c = (passphrase_cb_s*)hook;
324          c->pwd_init = 1;      HANDLE hd = (HANDLE)fd;
325      }      void *item;
326        const char *keyid=NULL, *pass;
327      if (passphrase_info) {      DWORD n;
328          if (strlen (passphrase_info) < 16 &&      int rc = 0;
329              !strstr (passphrase_info, "OPENPGP")) {  
330              /* assume symetric encryption. */      if (!c) {
331              int n=2;          log_debug ("passphrase_cb: error '!c'\r\n");
332              c->sym.sym_algo = atoi (passphrase_info);          return gpg_error (GPG_ERR_INV_ARG);
333              if (c->sym.sym_algo > 9)      }
334                  n++;      c->bad_pwd = prev_was_bad? 1 : 0;
335              /* XXX: be more strict. */      if (prev_was_bad && !c->cancel) {
336              c->sym.s2k_mode = atoi (passphrase_info+n);          if (c->pwd)
337              c->sym.s2k_hash = atoi (passphrase_info+n+2);              burn_passphrase (&c->pwd);
338          }          agent_del_cache (c->keyid);
339            c->pwd_init = 1;
340          keyid = parse_gpg_keyid (passphrase_info);      }
341          pass = agent_get_cache (keyid+8, &item);  
342          if (pass) {      if (passphrase_info) {
343              agent_unlock_cache_entry (&item);          if (strlen (passphrase_info) < 16 &&
344              c->pwd_init = 0;              !strstr (passphrase_info, "OPENPGP")) {
345              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))              /* assume symetric encryption. */
346                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);              int pos=2;
347              if (!WriteFile (hd, "\n", 1, &n, NULL))              c->sym.sym_algo = atoi (passphrase_info);
348                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);              if (c->sym.sym_algo > 9)
349              return 0;                  pos++;
350          }              /* XXX: be more strict. */
351      }              c->sym.s2k_mode = atoi (passphrase_info+pos);
352                c->sym.s2k_hash = atoi (passphrase_info+pos+2);
353      if (c->pwd_init) {          }
354          if (keyid && strlen (keyid) == 16)  
355              strcpy (c->keyid, keyid+8);          keyid = parse_gpg_keyid (passphrase_info);
356            pass = agent_get_cache (keyid+8, &item);        
357          /* if @passphrase_info contains 'OPENPGP' we assume a smart card          if (pass) {
358              has been used. */              agent_unlock_cache_entry (&item);
359          if (strstr (passphrase_info, "OPENPGP")) {              c->pwd_init = 0;
360              const char *s=passphrase_info;              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
361              while (s && *s && *s != 'D')                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
362                  s++;              if (!WriteFile (hd, "\n", 1, &n, NULL))
363              _snprintf (c->info, sizeof c->info-1,                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
364                         _("Please enter the PIN to unlock your secret card key\n"              return 0;
365                           "Card: %s"), extract_serial_no (s));          }
366              c->is_card = 1;      }
367          }  
368          else if (uid_hint)      if (c->pwd_init) {
369              parse_gpg_description (uid_hint, passphrase_info,          if (keyid && strlen (keyid) == 16)
370                                     c->info, sizeof c->info - 1);              strcpy (c->keyid, keyid+8);
371          if (c->gpg_cmd == GPG_CMD_DECRYPT) {  
372              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
373                                   (HWND)c->hwnd, passphrase_callback_proc,              has been used. */
374                                   (LPARAM)c);          if (strstr (passphrase_info, "OPENPGP")) {
375          }              const char *s=passphrase_info;
376          else if (c->gpg_cmd == GPG_CMD_SIGN) {              while (s && *s && *s != 'D')
377              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,                  s++;
378                                   (HWND)c->hwnd, passphrase_callback_proc,              _snprintf (c->info, sizeof c->info-1,
379                                   (LPARAM)c);                         _("Please enter the PIN to unlock your secret card key\n"
380          }                           "Card: %s"), extract_serial_no (s));
381          if (rc == -1) {              c->is_card = 1;
382              if (!WriteFile (hd, "\n", 1, &n, NULL))          }
383                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);          else if (uid_hint)
384              return 0;              parse_gpg_description (uid_hint, passphrase_info,
385          }                                     c->info, sizeof c->info - 1);
386          c->pwd_init = 0;          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
387      }              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
388      if (c->cancel) {                                   (HWND)c->hwnd, passphrase_callback_proc,
389          if (!WriteFile (hd, "\n", 1, &n, NULL))                                   (LPARAM)c);
390              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);          }
391          return 0;          else if (c->gpg_cmd == GPG_CMD_SIGN) {
392      }              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
393                                     (HWND)c->hwnd, passphrase_callback_proc,
394      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);                                   (LPARAM)c);
395      WriteFile (hd, "\n", 1, &n, NULL);          }
396      return 0;          if (rc == -1) {
397  }              if (!WriteFile (hd, "\n", 1, &n, NULL))
398                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
399                return 0;
400  /* Initialize the given passphrase callback @cb with the          }
401     used gpgme context @ctx, the command @cmd and a title          c->pwd_init = 0;
402     @title for the dialog. */      }
403  void      if (c->cancel) {
404  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,          if (!WriteFile (hd, "\n", 1, &n, NULL))
405                         int cmd, HWND hwnd, const char *title)              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
406  {          return 0;
407      memset (cb, 0, sizeof *cb);      }
408      cb->gpg_cmd = cmd;  
409      cb->bad_pwd = 0;      if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
410      cb->is_card = 0;          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
411      cb->cancel = 0;      if (!WriteFile (hd, "\n", 1, &n, NULL))
412      cb->hwnd = hwnd;          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
413      cb->pwd_init = 1;      return 0;
414      free_if_alloc (cb->title);  }
415      cb->title = m_strdup (title);  
416      if (!cb->title)  
417          BUG (NULL);  /* Initialize the given passphrase callback @cb with the
418      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);     used gpgme context @ctx, the command @cmd and a title
419      cb->gpg = ctx;     @title for the dialog. */
420  }  void
421    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
422                           int cmd, HWND hwnd, const char *title)
423  /* Release a passphrase callback @ctx. */  {
424  void      memset (cb, 0, sizeof *cb);
425  release_gpg_passphrase_cb (passphrase_cb_s *ctx)      cb->gpg_cmd = cmd;
426  {      cb->bad_pwd = 0;
427      gpgme_recipient_t r, n;      cb->is_card = 0;
428        cb->cancel = 0;
429      if (!ctx)      cb->hwnd = hwnd;
430          return;      cb->pwd_init = 1;
431      sfree_if_alloc (ctx->pwd);      free_if_alloc (cb->title);
432      free_if_alloc (ctx->title);      cb->title = m_strdup (title);
433      r = ctx->recipients;      if (!cb->title)
434      while (r) {          BUG (NULL);
435          n = r->next;      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
436          safe_free (r->keyid);      cb->gpg = ctx;
437          safe_free (r);  }
438          r = n;  
439      }  
440  }  /* Release a passphrase callback @ctx. */
441    void
442    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
443  /* Simple check to measure passphrase (@pass) quality.  {
444     Return value: 0 on success. */      gpgme_recipient_t r, n;
445  int  
446  check_passwd_quality (const char *pass, int strict)      if (!ctx)
447  {          return;
448      int i, nd=0, nc=0, n;      sfree_if_alloc (ctx->pwd);
449        free_if_alloc (ctx->title);
450      n = strlen (pass);      r = ctx->recipients;
451      if (n < 8)      while (r) {
452          return -1;          n = r->next;
453            safe_free (r->keyid);
454      for (i=0; i < n; i++) {          safe_free (r);
455          if (isdigit (pass[i]))          r = n;
456              nd++;      }
457          if (isalpha (pass[i]))  }
458              nc++;  
459      }  
460    /* Simple check to measure passphrase (@pass) quality.
461      /* check that the passphrase contains letters and numbers. */     Return value: 0 on success. */
462      if (nd == n || nc == n)  int
463          return -1;  check_passwd_quality (const char *pass, int strict)
464    {
465      return 0;      int i, nd=0, nc=0, n;
466  }  
467        n = strlen (pass);
468        if (n < 8)
469            return -1;
470    
471        for (i=0; i < n; i++) {
472            if (isdigit (pass[i]))
473                nd++;
474            if (isalpha (pass[i]))
475                nc++;
476        }
477    
478        /* check that the passphrase contains letters and numbers. */
479        if (nd == n || nc == n)
480            return -1;
481    
482        return 0;
483    }

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