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

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revision 34 by twoaday, Wed Oct 26 11:20:09 2005 UTC revision 179 by twoaday, Fri Feb 24 13:12:26 2006 UTC
# Line 1  Line 1 
1  /* wptPassphraseCB.cpp - GPGME Passphrase Callback  /* wptPassphraseCB.cpp - GPGME Passphrase Callback
2   *      Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz   *      Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz
3   *      Copyright (C) 2005 g10 Code GmbH   *      Copyright (C) 2005 g10 Code GmbH
4   *   *
5   * This file is part of WinPT.   * This file is part of WinPT.
6   *   *
7   * WinPT is free software; you can redistribute it and/or   * WinPT is free software; you can redistribute it and/or
8   * modify it under the terms of the GNU General Public License   * modify it under the terms of the GNU General Public License
9   * as published by the Free Software Foundation; either version 2   * as published by the Free Software Foundation; either version 2
10   * of the License, or (at your option) any later version.   * of the License, or (at your option) any later version.
11   *     *  
12   * WinPT is distributed in the hope that it will be useful,   * WinPT is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * General Public License for more details.   * General Public License for more details.
16   *   *
17   * You should have received a copy of the GNU General Public License   * You should have received a copy of the GNU General Public License
18   * along with WinPT; if not, write to the Free Software Foundation,   * along with WinPT; if not, write to the Free Software Foundation,
19   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20   */   */
21    
22  #include <windows.h>  #ifdef HAVE_CONFIG_H
23  #include <ctype.h>  #include <config.h>
24    #endif
25  #include "../resource.h"  
26  #include "wptNLS.h"  #include <windows.h>
27  #include "wptW32API.h"  #include <ctype.h>
28  #include "wptVersion.h"  
29  #include "wptGPG.h"  #include "resource.h"
30  #include "wptCommonCtl.h"  #include "wptNLS.h"
31  #include "wptContext.h"  #include "wptW32API.h"
32  #include "wptDlgs.h"  #include "wptVersion.h"
33  #include "wptUTF8.h"  #include "wptGPG.h"
34  #include "wptErrors.h"  #include "wptCommonCtl.h"
35  #include "wptTypes.h"  #include "wptContext.h"
36  #include "wptKeyList.h"  #include "wptDlgs.h"
37  #include "wptAgent.h"  #include "wptUTF8.h"
38  #include "wptRegistry.h"  #include "wptErrors.h"
39    #include "wptTypes.h"
40  const char* get_symkey_algo (int algo);  #include "wptKeylist.h"
41    #include "wptAgent.h"
42  #define item_ctrl_id( cmd ) \  #include "wptRegistry.h"
43      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)  
44    const char* get_symkey_algo (int algo);
45  #define item_ctrl_id2(cmd) \  
46      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)  #define item_ctrl_id( cmd ) \
47        ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
48    
49  /* Overwrite passphrase and free memory. */  #define item_ctrl_id2(cmd) \
50  static void      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
51  burn_passphrase (char **pwd)  
52  {  
53      char *pass = *pwd;  /* Overwrite passphrase and free memory. */
54      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, IDCANCEL, _("&Cancel"));
84          }          SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
85          else if (c->gpg_cmd == GPG_CMD_SIGN)          SetWindowText (dlg, c->title);
86              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
87          if (c->recipients)              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
88              recip = c->recipients; /* recipients were already extracted. */                              _("Encrypted with the following public key(s)"));
89          else {              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
90              /* XXX: not all ENCRYPT_TO entries are listed here. */          }
91              res = gpgme_op_decrypt_result (c->gpg);          else if (c->gpg_cmd == GPG_CMD_SIGN) {
92              if (res && res->recipients)              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
93                  recip = res->recipients;              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
94          }          }
95          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {          /* Because it depends on the order the keys are stored in the
96              for (r = res->recipients; r; r = r->next) {             keyring whether res->recipients is complete or not, we also
97                  get_pubkey (r->keyid, &key);             support that the recipients were externally extracted and then
98                  if (key) {             we use this list. */
99                      char *uid;          if (c->recipients)
100                      id = key->uids->name;              recip = c->recipients; /* recipients were already extracted. */
101                      if (!id)          else {
102                          id = _("Invalid User ID");              res = gpgme_op_decrypt_result (c->gpg);
103                      uid = utf8_to_wincp (id, strlen (id));              if (res && res->recipients)
104                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1                  recip = res->recipients;
105                                       + strlen (key->uids->email)+1];          }
106                      if (!info)          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
107                          BUG (NULL);              for (r = recip; r; r = r->next) {
108                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,                  get_pubkey (r->keyid, &key);
109                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                  if (key) {
110                      free (uid);                      gpgme_user_id_t u = key->uids;
111                                            char *uid;
112                  }  
113                  else {                      id = u->name;
114                      info = new char [32 + strlen (r->keyid)+1 + 4];                      if (!id)
115                      if (!info)                          id = _("Invalid User ID");
116                          BUG (NULL);                      uid = utf8_to_wincp (id, strlen (id));
117                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),                      n = 32+strlen (uid)+1+4+strlen (r->keyid)+1;
118                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                      if (u->email)
119                  }                          n += strlen (u->email)+1;
120                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);                      info = new char [n+1];
121                  free_if_alloc (info);                      if (!info)
122              }                          BUG (NULL);
123          }                      if (!u->email || strlen (u->email) < 1)
124          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                          sprintf (info, "%s (%s, 0x%s)", uid,
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?                      else
127                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                          sprintf (info, "%s <%s> (%s, 0x%s)", uid, u->email,
128                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
129                          _("Please enter your passphrase"));                      free (uid);
130          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                  }
131              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));                  else {
132              if (res && !res->recipients) {                      info = new char [32 + strlen (r->keyid)+1 + 4];
133                  const char *s = _("Symmetric encryption.\n"                      if (!info)
134                                    "%s encrypted data.");                          BUG (NULL);
135                  const char *alg = get_symkey_algo (c->sym.sym_algo);                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
136                  info = new char[strlen (s) + strlen (alg) + 2];                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
137                  if (!info)                  }
138                      BUG (NULL);                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
139                  sprintf (info, s, alg);                  free_if_alloc (info);
140                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);              }
141                  free_if_alloc (info);          }
142              }          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
143              else              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
144                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
145          }                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
146          else {                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
147              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));                          _("Please enter your passphrase"));
148              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
149          }              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
150          center_window (dlg, NULL);              if (res && !res->recipients) {
151          SetForegroundWindow (dlg);                  const char *s = _("Symmetric encryption.\n"
152          set_active_window (dlg);                                    "%s encrypted data.");
153          return FALSE;                  const char *alg = get_symkey_algo (c->sym.sym_algo);
154                    info = new char[strlen (s) + strlen (alg) + 2];
155          case WM_SYSCOMMAND:                  if (!info)
156              if (LOWORD (wparam) == SC_CLOSE) {                      BUG (NULL);
157                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");                  sprintf (info, s, alg);
158                  c->cancel = 1;                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
159                  EndDialog (dlg, TRUE);                  free_if_alloc (info);
160              }              }
161              break;              else
162                    SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
163          case WM_COMMAND:          }
164              switch (HIWORD (wparam)) {          else {
165              case BN_CLICKED:              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
166                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
167                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {          }
168                      HWND hwnd;          center_window (dlg, NULL);
169                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));          SetForegroundWindow (dlg);
170                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));          return FALSE;
171                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);  
172                      SetFocus (hwnd);          case WM_SYSCOMMAND:
173                  }              if (LOWORD (wparam) == SC_CLOSE) {
174              }                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
175                    c->cancel = 1;
176              switch (LOWORD (wparam)) {                  EndDialog (dlg, TRUE);
177              case IDOK:                }
178                  /* XXX: the item is even cached when the passphrase is not              break;
179                          correct, which means that the user needs to delete all  
180                          cached entries to continue. */          case WM_COMMAND:
181                  if (c->pwd)              switch (HIWORD (wparam)) {
182                      burn_passphrase (&c->pwd);              case BN_CLICKED:
183                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
184                  if (!n) {                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
185                      c->pwd = new char[2];                      HWND hwnd;
186                      if (!c->pwd)                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
187                          BUG (NULL);                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
188                      strcpy (c->pwd, "");                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
189                  }                      SetFocus (hwnd);
190                  else {                  }
191                      c->pwd = new char[n+2];              }
192                      if (!c->pwd)  
193                          BUG (NULL);              switch (LOWORD (wparam)) {
194                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);              case IDOK:  
195                  }                  /* XXX: the item is even cached when the passphrase is not
196                  res = gpgme_op_decrypt_result (c->gpg);                          correct, which means that the user needs to delete all
197                  if (!res)                          cached entries to continue. */
198                      res_sig = gpgme_op_sign_result (c->gpg);                  if (c->pwd)
199                  if (reg_prefs.cache_time > 0 && !c->is_card &&                      burn_passphrase (&c->pwd);
200                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
201                      if (agent_get_cache (c->keyid, &item))                  if (!n) {
202                          agent_unlock_cache_entry (&item);                      c->pwd = new char[2];
203                      else                      if (!c->pwd)
204                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                          BUG (NULL);
205                  }                      strcpy (c->pwd, "");
206                  c->cancel = 0;                  }
207                  EndDialog (dlg, TRUE);                  else {
208                  return TRUE;                      c->pwd = new char[n+2];
209                                        if (!c->pwd)
210              case IDCANCEL:                          BUG (NULL);
211                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
212                  c->cancel = 1;                  }
213                  EndDialog (dlg, FALSE);                  res = gpgme_op_decrypt_result (c->gpg);
214                  return FALSE;                  if (!res)
215              }                      res_sig = gpgme_op_sign_result (c->gpg);            
216              break;                  if (reg_prefs.cache_time > 0 && !c->is_card &&
217      }                      (res || res_sig)) {
218                            if (agent_get_cache (c->keyid, &item))                      
219      return FALSE;                          agent_unlock_cache_entry (&item);
220  }                      else
221                            agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
222                    }
223  /* Extract the main keyid from @pass_info.                  c->cancel = 0;
224     Return value: long main keyid or NULL for an error. */                  EndDialog (dlg, TRUE);
225  static const char*                  return TRUE;
226  parse_gpg_keyid (const char *pass_info)                  
227  {              case IDCANCEL:
228      static char keyid[16+1];                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
229                        c->cancel = 1;
230      /* XXX: check for leading alpha-chars? */                  EndDialog (dlg, FALSE);
231      if (strlen (pass_info) < 16)                  return FALSE;
232          return NULL;              }
233      /* the format of the desc buffer looks like this:              break;
234         request_keyid[16] main_keyid[16] keytype[1] keylength[4]      }
235         we use the main keyid to use only one cache entry. */      
236      strncpy (keyid, pass_info+17, 16);      return FALSE;
237      keyid[16] = 0;  }
238      return keyid;  
239  }  
240    /* Extract the main keyid from @pass_info.
241       Return value: long main keyid or NULL for an error. */
242  /* Parse the information in @uid_hint and @pass_info to generate  static const char*
243     a input message for the user in @desc. */  parse_gpg_keyid (const char *pass_info)
244  static int  {
245  parse_gpg_description (const char *uid_hint, const char *pass_info,      static char keyid[16+1];
246                         char *desc, int size)      
247  {      /* XXX: check for leading alpha-chars? */
248      gpgme_pubkey_algo_t algo;      if (strlen (pass_info) < 16) {
249      char usedkey[16+1];          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
250      char mainkey[16+1];          return NULL;
251      char *uid, *p;      }
252      int n=0;      /* the format of the desc buffer looks like this:
253           request_keyid[16] main_keyid[16] keytype[1] keylength[4]
254      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */         we use the main keyid to use only one cache entry. */
255      if (strlen (uid_hint) < 17) {      strncpy (keyid, pass_info+17, 16);
256          *desc = 0;      keyid[16] = 0;
257          return -1;      return keyid;
258      }  }
259    
260      while (p = strsep ((char**)&pass_info, " ")) {  
261          switch (n++) {  /* Parse the information in @uid_hint and @pass_info to generate
262          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;     a input message for the user in @desc. */
263          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;  static int
264          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;  parse_gpg_description (const char *uid_hint, const char *pass_info,
265          }                         char *desc, int size)
266      }  {
267      uid_hint += 16; /* skip keyid */      gpgme_pubkey_algo_t algo;
268      uid_hint += 1;  /* space */      char usedkey[16+1];
269        char mainkey[16+1];
270      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));      char *uid, *p;
271        int n=0;
272      if (strcmp (usedkey, mainkey))  
273          _snprintf (desc, size-1,      algo = (gpgme_pubkey_algo_t)0;
274                     _("You need a passphrase to unlock the secret key for\n"      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
275                       "user: \"%s\"\n"      if (strlen (uid_hint) < 17) {
276                       "%s key, ID %s (main key ID %s)\n"),          *desc = 0;
277                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
278      else if (!strcmp (usedkey, mainkey))          return -1;
279          _snprintf (desc, size-1,      }
280                     _("You need a passphrase to unlock the secret key for\n"  
281                       "user: \"%s\"\n"      while (p = strsep ((char**)&pass_info, " ")) {
282                       "%s key, ID %s\n"),          switch (n++) {
283                       uid, get_key_pubalgo (algo), usedkey+8);          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
284      free (uid);          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
285      return 0;          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
286  }          }
287        }
288        uid_hint += 16; /* skip keyid */
289  /* Extract the serial number from the card ID @id and return it. */      uid_hint += 1;  /* space */
290  const char*  
291  extract_serial_no (const char *id)      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
292  {  
293      static char buf[8];      if (strcmp (usedkey, mainkey))
294      char *p;          _snprintf (desc, size-1,
295                       _("You need a passphrase to unlock the secret key for\n"
296      p = strchr (id, '/');                       "user: \"%s\"\n"
297      if (!p)                       "%s key, ID %s (main key ID %s)\n"),
298          return NULL;                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
299      strncpy (buf, id+(p-id)-6, 6);      else if (!strcmp (usedkey, mainkey))
300      return buf;          _snprintf (desc, size-1,
301  }                     _("You need a passphrase to unlock the secret key for\n"
302                         "user: \"%s\"\n"
303                         "%s key, ID %s\n"),
304  /* Passphrase callback with the ability to support caching. */                       uid, get_key_pubalgo (algo), usedkey+8);
305  gpgme_error_t      free (uid);
306  passphrase_cb (void *hook, const char *uid_hint,      return 0;
307                 const char *passphrase_info,  }
308                 int prev_was_bad, int fd)  
309  {  
310      passphrase_cb_s *c = (passphrase_cb_s*)hook;  /* Extract the serial number from the card ID @id and return it. */
311      HANDLE hd = (HANDLE)fd;  const char*
312      void *item;  extract_serial_no (const char *id)
313      const char *keyid, *pass;  {
314      DWORD n;      static char buf[8];
315      int rc;      char *p;
316    
317      if (!c)      p = strchr (id, '/');
318          return gpg_error (GPG_ERR_INV_ARG);      if (!p) {
319      c->bad_pwd = prev_was_bad? 1 : 0;          log_debug ("extract_serial_no: error '%s'\r\n", id);
320      if (prev_was_bad && !c->cancel) {          return NULL;
321          if (c->pwd)      }
322              burn_passphrase (&c->pwd);      strncpy (buf, id+(p-id)-6, 6);
323          agent_del_cache (c->keyid);      return buf;
324          c->pwd_init = 1;  }
325      }  
326    
327      if (passphrase_info) {  /* Passphrase callback with the ability to support caching. */
328          if (strlen (passphrase_info) < 16 &&  gpgme_error_t
329              !strstr (passphrase_info, "OPENPGP")) {  passphrase_cb (void *hook, const char *uid_hint,
330              /* assume symetric encryption. */                 const char *passphrase_info,
331              int n=2;                 int prev_was_bad, int fd)
332              c->sym.sym_algo = atoi (passphrase_info);  {
333              if (c->sym.sym_algo > 9)      passphrase_cb_s *c = (passphrase_cb_s*)hook;
334                  n++;      HANDLE hd = (HANDLE)fd;
335              /* XXX: be more strict. */      void *item;
336              c->sym.s2k_mode = atoi (passphrase_info+n);      const char *keyid=NULL, *pass;
337              c->sym.s2k_hash = atoi (passphrase_info+n+2);      DWORD n;
338          }      int rc = 0;
339    
340          keyid = parse_gpg_keyid (passphrase_info);      if (!c) {
341          pass = agent_get_cache (keyid+8, &item);          log_debug ("passphrase_cb: error '!c'\r\n");
342          if (pass) {          return gpg_error (GPG_ERR_INV_ARG);
343              agent_unlock_cache_entry (&item);      }
344              c->pwd_init = 0;      c->bad_pwd = prev_was_bad? 1 : 0;
345              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))      if (prev_was_bad && !c->cancel) {
346                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);          if (c->pwd)
347              if (!WriteFile (hd, "\n", 1, &n, NULL))              burn_passphrase (&c->pwd);
348                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);          agent_del_cache (c->keyid);
349              return 0;          c->pwd_init = 1;
350          }      }
351      }  
352        if (passphrase_info) {
353      if (c->pwd_init) {          if (strlen (passphrase_info) < 16 &&
354          if (keyid && strlen (keyid) == 16)              !strstr (passphrase_info, "OPENPGP")) {
355              strcpy (c->keyid, keyid+8);              /* assume symetric encryption. */
356                int pos=2;
357          /* if @passphrase_info contains 'OPENPGP' we assume a smart card              c->sym.sym_algo = atoi (passphrase_info);
358              has been used. */              if (c->sym.sym_algo > 9)
359          if (strstr (passphrase_info, "OPENPGP")) {                  pos++;
360              const char *s=passphrase_info;              /* XXX: be more strict. */
361              while (s && *s && *s != 'D')              c->sym.s2k_mode = atoi (passphrase_info+pos);
362                  s++;              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
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));          keyid = parse_gpg_keyid (passphrase_info);
366              c->is_card = 1;          pass = agent_get_cache (keyid+8, &item);        
367          }          if (pass) {
368          else if (uid_hint)              agent_unlock_cache_entry (&item);
369              parse_gpg_description (uid_hint, passphrase_info,              c->pwd_init = 0;
370                                     c->info, sizeof c->info - 1);              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
371          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
372              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,              if (!WriteFile (hd, "\n", 1, &n, NULL))
373                                   (HWND)c->hwnd, passphrase_callback_proc,                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
374                                   (LPARAM)c);              return 0;
375          }          }
376          else if (c->gpg_cmd == GPG_CMD_SIGN) {      }
377              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,  
378                                   (HWND)c->hwnd, passphrase_callback_proc,      if (c->pwd_init) {
379                                   (LPARAM)c);          if (keyid && strlen (keyid) == 16)
380          }              strcpy (c->keyid, keyid+8);
381          if (rc == -1) {  
382              if (!WriteFile (hd, "\n", 1, &n, NULL))          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
383                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);              has been used. */
384              return 0;          if (strstr (passphrase_info, "OPENPGP")) {
385          }              const char *s=passphrase_info;
386          c->pwd_init = 0;              while (s && *s && *s != 'D')
387      }                  s++;
388      if (c->cancel) {              _snprintf (c->info, sizeof c->info-1,
389          if (!WriteFile (hd, "\n", 1, &n, NULL))                         _("Please enter the PIN to unlock your secret card key\n"
390              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);                           "Card: %s"), extract_serial_no (s));
391          return 0;              c->is_card = 1;
392      }          }
393            else if (uid_hint)
394      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);              parse_gpg_description (uid_hint, passphrase_info,
395      WriteFile (hd, "\n", 1, &n, NULL);                                     c->info, sizeof c->info - 1);
396      return 0;          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
397  }              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
398                                     (HWND)c->hwnd, passphrase_callback_proc,
399                                     (LPARAM)c);
400  /* Initialize the given passphrase callback @cb with the          }
401     used gpgme context @ctx, the command @cmd and a title          else if (c->gpg_cmd == GPG_CMD_SIGN) {
402     @title for the dialog. */              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
403  void                                   (HWND)c->hwnd, passphrase_callback_proc,
404  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,                                   (LPARAM)c);
405                         int cmd, HWND hwnd, const char *title)          }
406  {          if (rc == -1) {
407      memset (cb, 0, sizeof *cb);              if (!WriteFile (hd, "\n", 1, &n, NULL))
408      cb->gpg_cmd = cmd;                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
409      cb->bad_pwd = 0;              return 0;
410      cb->is_card = 0;          }
411      cb->cancel = 0;          c->pwd_init = 0;
412      cb->hwnd = hwnd;      }
413      cb->pwd_init = 1;      if (c->cancel) {
414      free_if_alloc (cb->title);          if (!WriteFile (hd, "\n", 1, &n, NULL))
415      cb->title = m_strdup (title);              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
416      if (!cb->title)          return 0;
417          BUG (NULL);      }
418      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);  
419      cb->gpg = ctx;      if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
420  }          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
421        if (!WriteFile (hd, "\n", 1, &n, NULL))
422            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
423  /* Release a passphrase callback @ctx. */      return 0;
424  void  }
425  release_gpg_passphrase_cb (passphrase_cb_s *ctx)  
426  {  
427      gpgme_recipient_t r, n;  /* Initialize the given passphrase callback @cb with the
428       used gpgme context @ctx, the command @cmd and a title
429      if (!ctx)     @title for the dialog. */
430          return;  void
431      sfree_if_alloc (ctx->pwd);  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
432      free_if_alloc (ctx->title);                         int cmd, HWND hwnd, const char *title)
433      r = ctx->recipients;  {
434      while (r) {      memset (cb, 0, sizeof *cb);
435          n = r->next;      cb->gpg_cmd = cmd;
436          safe_free (r->keyid);      cb->bad_pwd = 0;
437          safe_free (r);      cb->is_card = 0;
438          r = n;      cb->cancel = 0;
439      }      cb->hwnd = hwnd;
440  }      cb->pwd_init = 1;
441        free_if_alloc (cb->title);
442        cb->title = m_strdup (title);
443  /* Simple check to measure passphrase (@pass) quality.      if (!cb->title)
444     Return value: 0 on success. */          BUG (NULL);
445  int      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
446  check_passwd_quality (const char *pass, int strict)      cb->gpg = ctx;
447  {  }
448      int i, nd=0, nc=0, n;  
449    
450      n = strlen (pass);  /* Release a passphrase callback @ctx. */
451      if (n < 8)  void
452          return -1;  release_gpg_passphrase_cb (passphrase_cb_s *ctx)
453    {
454      for (i=0; i < n; i++) {      gpgme_recipient_t r, n;
455          if (isdigit (pass[i]))  
456              nd++;      if (!ctx)
457          if (isalpha (pass[i]))          return;
458              nc++;      sfree_if_alloc (ctx->pwd);
459      }      free_if_alloc (ctx->title);
460        r = ctx->recipients;
461      /* check that the passphrase contains letters and numbers. */      while (r) {
462      if (nd == n || nc == n)          n = r->next;
463          return -1;          safe_free (r->keyid);
464            safe_free (r);
465      return 0;          r = n;
466  }      }
467    }
468    
469    
470    /* Simple check to measure passphrase (@pass) quality.
471       Return value: 0 on success. */
472    int
473    check_passwd_quality (const char *pass, int strict)
474    {
475        int i, nd=0, nc=0, n;
476    
477        n = strlen (pass);
478        if (n < 8)
479            return -1;
480    
481        for (i=0; i < n; i++) {
482            if (isdigit (pass[i]))
483                nd++;
484            if (isalpha (pass[i]))
485                nc++;
486        }
487    
488        /* check that the passphrase contains letters and numbers. */
489        if (nd == n || nc == n)
490            return -1;
491    
492        return 0;
493    }
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