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

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revision 28 by twoaday, Thu Oct 20 12:35:59 2005 UTC revision 187 by twoaday, Wed Mar 22 11:04:20 2006 UTC
# Line 1  Line 1 
1  /* wptPassphraseCB.cpp - GPGME Passphrase Callback  /* wptPassphraseCB.cpp - GPGME Passphrase Callback
2   *      Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz   *      Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz
3   *      Copyright (C) 2005 g10 Code GmbH   *      Copyright (C) 2005 g10 Code GmbH
4   *   *
5   * This file is part of WinPT.   * This file is part of WinPT.
6   *   *
7   * WinPT is free software; you can redistribute it and/or   * WinPT is free software; you can redistribute it and/or
8   * modify it under the terms of the GNU General Public License   * modify it under the terms of the GNU General Public License
9   * as published by the Free Software Foundation; either version 2   * as published by the Free Software Foundation; either version 2
10   * of the License, or (at your option) any later version.   * of the License, or (at your option) any later version.
11   *     *  
12   * WinPT is distributed in the hope that it will be useful,   * WinPT is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * General Public License for more details.   * General Public License for more details.
16   *   *
17   * You should have received a copy of the GNU General Public License   * You should have received a copy of the GNU General Public License
18   * along with WinPT; if not, write to the Free Software Foundation,   * along with WinPT; if not, write to the Free Software Foundation,
19   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20   */   */
21    
22  #include <windows.h>  #ifdef HAVE_CONFIG_H
23  #include <ctype.h>  #include <config.h>
24    #endif
25  #include "../resource.h"  
26  #include "wptNLS.h"  #include <windows.h>
27  #include "wptW32API.h"  #include <ctype.h>
28  #include "wptVersion.h"  
29  #include "wptGPG.h"  #include "resource.h"
30  #include "wptCommonCtl.h"  #include "wptNLS.h"
31  #include "wptContext.h"  #include "wptW32API.h"
32  #include "wptDlgs.h"  #include "wptVersion.h"
33  #include "wptUTF8.h"  #include "wptGPG.h"
34  #include "wptErrors.h"  #include "wptCommonCtl.h"
35  #include "wptTypes.h"  #include "wptContext.h"
36  #include "wptKeyList.h"  #include "wptDlgs.h"
37  #include "wptAgent.h"  #include "wptUTF8.h"
38  #include "wptRegistry.h"  #include "wptErrors.h"
39    #include "wptTypes.h"
40  const char* get_symkey_algo (int algo);  #include "wptKeylist.h"
41    #include "wptAgent.h"
42  #define item_ctrl_id( cmd ) \  #include "wptRegistry.h"
43      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)  
44    const char* get_symkey_algo (int algo);
45  #define item_ctrl_id2(cmd) \  
46      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)  #define item_ctrl_id(cmd) \
47        ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
48    
49  /* Overwrite passphrase and free memory. */  #define item_ctrl_id2(cmd) \
50  static void      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
51  burn_passphrase (char **pwd)  
52  {  
53      char *pass = *pwd;    /* Overwrite passphrase and free memory. */
54      memset (pass, 0, strlen (pass));  static void
55      delete []pass;  burn_passphrase (char **pwd)
56      *pwd = NULL;  {
57  }      char *pass = *pwd;
58        wipememory (pass, strlen (pass));
59        delete []pass;
60  /* Dialog procedure for the passphrase callback. */      *pwd = NULL;
61  static BOOL CALLBACK  }
62  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)  
63  {      
64      static passphrase_cb_s * c;  /* Dialog procedure for the passphrase callback. */
65      gpgme_decrypt_result_t res;  static BOOL CALLBACK
66      gpgme_sign_result_t res_sig;  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
67      gpgme_key_t key;  {    
68      void *ctx = NULL, *item;      static passphrase_cb_s *c;
69      const char *id;      gpgme_decrypt_result_t res=NULL;
70      char *info;      gpgme_sign_result_t res_sig=NULL;
71      int n;      gpgme_key_t key;
72        gpgme_recipient_t recip=NULL, r;
73      /* XXX: we need a timer to update the 'enc_to' entries. */      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_ACTIVATE:
80          if (c->gpg_cmd == GPG_CMD_DECRYPT) {          safe_edit_control_init (dlg, item_ctrl_id (c->gpg_cmd));
81              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,          break;
82                  _("Encrypted with the following public key(s)") );  
83              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );      case WM_DESTROY:
84          }          safe_edit_control_free (dlg, item_ctrl_id (c->gpg_cmd));
85          else if (c->gpg_cmd == GPG_CMD_SIGN)          break;
86              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);  
87          res = gpgme_op_decrypt_result (c->gpg);      case WM_INITDIALOG:
88          if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {          c = (passphrase_cb_s *)lparam;
89              gpgme_recipient_t r;          if (!c)
90                BUG (0);
91              /* XXX: not all ENCRYPT_TO entries are listed here. */          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
92              for (r = res->recipients; r; r = r->next) {          SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
93                  get_pubkey (r->keyid, &key);          SetWindowText (dlg, c->title);
94                  if (key) {          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
95                      char *uid;              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
96                      id = key->uids->name;                              _("Encrypted with the following public key(s)"));
97                      if (!id)              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
98                          id = _("Invalid User ID");          }
99                      uid = utf8_to_wincp (id, strlen (id));          else if (c->gpg_cmd == GPG_CMD_SIGN) {
100                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
101                                       + strlen (key->uids->email)+1];              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
102                      if (!info)          }
103                          BUG (NULL);          /* Because it depends on the order the keys are stored in the
104                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,             keyring whether res->recipients is complete or not, we also
105                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);             support that the recipients were externally extracted and then
106                      free (uid);             we use this list. */
107                                if (c->recipients)
108                  }              recip = c->recipients; /* recipients were already extracted. */
109                  else {          else {
110                      info = new char [32 + strlen (r->keyid)+1 + 4];              res = gpgme_op_decrypt_result (c->gpg);
111                      if (!info)              if (res && res->recipients)
112                          BUG (NULL);                  recip = res->recipients;
113                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),          }
114                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
115                  }              for (r = recip; r; r = r->next) {
116                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);                  get_pubkey (r->keyid, &key);
117                  free_if_alloc (info);                  if (key) {
118              }                      gpgme_user_id_t u = key->uids;
119          }                      char *uid;
120          else if (c->gpg_cmd == GPG_CMD_DECRYPT)  
121              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);                      id = u->name;
122          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?                      if (!id)
123                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                          id = _("Invalid User ID");
124                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :                      uid = utf8_to_native (id);
125                          _("Please enter your passphrase"));                      n = 32+strlen (uid)+1+4+strlen (r->keyid)+1;
126          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                      if (u->email)
127              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));                          n += strlen (u->email)+1;
128              if (res && !res->recipients) {                      info = new char [n+1];
129                  const char *s = _("Symmetric encryption.\n"                      if (!info)
130                                    "%s encrypted data.");                          BUG (NULL);
131                  const char *alg = get_symkey_algo (c->sym.sym_algo);                      if (!u->email || strlen (u->email) < 1)
132                  info = new char[strlen (s) + strlen (alg) + 2];                          sprintf (info, "%s (%s, 0x%s)", uid,
133                  if (!info)                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
134                      BUG (NULL);                      else
135                  sprintf (info, s, alg);                          sprintf (info, "%s <%s> (%s, 0x%s)", uid, u->email,
136                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
137                  free_if_alloc (info);                      free (uid);
138              }                  }
139              else                  else {
140                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                      info = new char [32 + strlen (r->keyid)+1 + 4];
141          }                      if (!info)
142          else {                          BUG (NULL);
143              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
144              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
145          }                  }
146          center_window (dlg, NULL);                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
147          SetForegroundWindow (dlg);                  free_if_alloc (info);
148          set_active_window (dlg);              }
149          return FALSE;          }
150            else if (c->gpg_cmd == GPG_CMD_DECRYPT)
151          case WM_SYSCOMMAND:              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
152              if (LOWORD (wparam) == SC_CLOSE) {          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
153                  SetDlgItemText (dlg, item_ctrl_id( c->gpg_cmd ), "");                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
154                  c->cancel = 1;                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
155                  EndDialog (dlg, TRUE);                          _("Please enter your passphrase"));
156              }          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
157              break;              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
158                if (res && !res->recipients) {
159          case WM_COMMAND:                  const char *s = _("Symmetric encryption.\n"
160              switch( HIWORD( wparam ) ) {                                    "%s encrypted data.");
161              case BN_CLICKED:                  const char *alg = get_symkey_algo (c->sym.sym_algo);
162                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE                  info = new char[strlen (s) + strlen (alg) + 2];
163                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                  if (!info)
164                      HWND hwnd;                      BUG (NULL);
165                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));                  sprintf (info, s, alg);
166                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
167                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);                  free_if_alloc (info);
168                      SetFocus (hwnd);              }
169                  }              else
170              }                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
171            }
172              switch (LOWORD (wparam)) {          else {
173              case IDOK:                SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
174                  /* fixme: the item is even cached when the passphrase is not              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
175                            correct, which means that the user needs to delete all          }
176                            cached entries to continue. */          center_window (dlg, NULL);
177                  if (c->pwd)          SetForegroundWindow (dlg);
178                      burn_passphrase (&c->pwd);          return FALSE;
179                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));  
180                  if (!n) {          case WM_SYSCOMMAND:
181                      c->pwd = new char[2];              if (LOWORD (wparam) == SC_CLOSE) {
182                      if (!c->pwd)                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
183                          BUG (NULL);                  c->cancel = 1;
184                      strcpy (c->pwd, "");                  EndDialog (dlg, TRUE);
185                  }              }
186                  else {              break;
187                      c->pwd = new char[n+2];  
188                      if (!c->pwd)          case WM_COMMAND:
189                          BUG (NULL);              switch (HIWORD (wparam)) {
190                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);              case BN_CLICKED:
191                  }                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
192                  res = gpgme_op_decrypt_result (c->gpg);                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
193                  if (!res)                      HWND hwnd;
194                      res_sig = gpgme_op_sign_result (c->gpg);                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
195                  if (reg_prefs.cache_time > 0 && !c->is_card &&                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
196                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
197                      if (agent_get_cache (c->keyid, &item))                      SetFocus (hwnd);
198                          agent_unlock_cache_entry (&item);                  }
199                      else              }
200                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);  
201                  }              switch (LOWORD (wparam)) {
202                  EndDialog (dlg, TRUE);              case IDOK:  
203                  return TRUE;                  /* XXX: the item is even cached when the passphrase is not
204                                            correct, which means that the user needs to delete all
205              case IDCANCEL:                          cached entries to continue. */
206                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                  if (c->pwd)
207                  c->cancel = 1;                      burn_passphrase (&c->pwd);
208                  EndDialog (dlg, FALSE);                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
209                  return FALSE;                  if (!n) {
210              }                      c->pwd = new char[2];
211              break;                      if (!c->pwd)
212      }                          BUG (NULL);
213                            strcpy (c->pwd, "");
214      return FALSE;                  }
215  }                  else {
216                        c->pwd = new char[n+2];
217                        if (!c->pwd)
218  /* Extract the main keyid from @pass_info.                          BUG (NULL);
219     Return value: long main keyid or NULL for an error. */                      SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd),
220  static const char*                                          c->pwd, n+1);
221  parse_gpg_keyid (const char *pass_info)                  }
222  {                  res = gpgme_op_decrypt_result (c->gpg);
223      static char keyid[16+1];                  if (!res)
224                            res_sig = gpgme_op_sign_result (c->gpg);            
225      /* XXX: check for leading alpha-chars? */                  if (reg_prefs.cache_time > 0 && !c->is_card &&
226      if (strlen (pass_info) < 16)                      (res || res_sig)) {
227          return NULL;                      if (agent_get_cache (c->keyid, &item))                      
228      /* the format of the desc buffer looks like this:                          agent_unlock_cache_entry (&item);
229         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                      else
230         we use the main keyid to use only one cache entry. */                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
231      strncpy (keyid, pass_info+17, 16);                  }
232      keyid[16] = 0;                  c->cancel = 0;
233      return keyid;                  EndDialog (dlg, TRUE);
234  }                  return TRUE;
235                    
236                case IDCANCEL:
237  /* Parse the information in @uid_hint and @pass_info to generate                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
238     a input message for the user in @desc. */                  c->cancel = 1;
239  static int                  EndDialog (dlg, FALSE);
240  parse_gpg_description (const char *uid_hint, const char *pass_info,                  return FALSE;
241                         char *desc, int size)              }
242  {              break;
243      gpgme_pubkey_algo_t algo;      }
244      char usedkey[16+1], mainkey[16+1];      
245      char *uid, *p;      return FALSE;
246      int n=0;  }
247    
248      if (strlen (uid_hint) < 17) {  
249          *desc = 0;  /* Extract the main keyid from @pass_info.
250          return -1;     Return value: long main keyid or NULL for an error. */
251      }  static const char*
252    parse_gpg_keyid (const char *pass_info)
253      while (p = strsep ((char**)&pass_info, " ")) {  {
254          switch (n++) {      static char keyid[16+1];
255          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;      
256          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;      /* XXX: check for leading alpha-chars? */
257          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;      if (strlen (pass_info) < 16) {
258          }          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
259      }          return NULL;
260      uid_hint += 16; /* skip keyid */      }
261      uid_hint += 1;  /* space */      /* the format of the desc buffer looks like this:
262           request_keyid[16] main_keyid[16] keytype[1] keylength[4]
263      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));         we use the main keyid to use only one cache entry. */
264        strncpy (keyid, pass_info+17, 16);
265      if (strcmp (usedkey, mainkey))      keyid[16] = 0;
266          _snprintf (desc, size-1,      return keyid;
267                     _("You need a passphrase to unlock the secret key for\n"  }
268                       "user: \"%s\"\n"  
269                       "%s key, ID %s (main key ID %s)\n"),  
270                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);  /* Parse the information in @uid_hint and @pass_info to generate
271      else if (!strcmp (usedkey, mainkey))     a input message for the user in @desc. */
272          _snprintf (desc, size-1,  static int
273                     _("You need a passphrase to unlock the secret key for\n"  parse_gpg_description (const char *uid_hint, const char *pass_info,
274                       "user: \"%s\"\n"                         char *desc, int size)
275                       "%s key, ID %s\n"),  {
276                       uid, get_key_pubalgo (algo), usedkey+8);      gpgme_pubkey_algo_t algo;
277      free (uid);      char usedkey[16+1];
278      return 0;      char mainkey[16+1];
279  }      char *uid, *p;
280        int n=0;
281    
282  /*      algo = (gpgme_pubkey_algo_t)0;
283  static int inline      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
284  is_hexstring (const char * p)      if (strlen (uid_hint) < 17) {
285  {          *desc = 0;
286      size_t i;          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
287            return -1;
288      for (i=0; i < strlen (p); i++) {      }
289          if (!isxdigit (p[i]))  
290              return -1;      while (p = strsep ((char**)&pass_info, " ")) {
291      }          switch (n++) {
292      return 0;          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
293  }          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
294  */          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
295            }
296        }
297  /* Extract the serial number from the card ID @id and return it. */      uid_hint += 16; /* skip keyid */
298  const char*      uid_hint += 1;  /* space */
299  extract_serial_no (const char *id)  
300  {      uid = utf8_to_native (uid_hint);
301      static char buf[8];  
302      char *p;      if (strcmp (usedkey, mainkey))
303            _snprintf (desc, size-1,
304      p = strchr (id, '/');                     _("You need a passphrase to unlock the secret key for\n"
305      if (!p)                       "user: \"%s\"\n"
306          return NULL;                       "%s key, ID %s (main key ID %s)\n"),
307      strncpy (buf, id+(p-id)-6, 6);                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
308      return buf;      else if (!strcmp (usedkey, mainkey))
309  }          _snprintf (desc, size-1,
310                       _("You need a passphrase to unlock the secret key for\n"
311                         "user: \"%s\"\n"
312  /* Passphrase callback with the ability to support caching. */                       "%s key, ID %s\n"),
313  gpgme_error_t                       uid, get_key_pubalgo (algo), usedkey+8);
314  passphrase_cb (void *hook, const char *uid_hint,      free (uid);
315                 const char *passphrase_info,      return 0;
316                 int prev_was_bad, int fd)  }
317  {  
318      passphrase_cb_s *c = (passphrase_cb_s*)hook;  
319      HANDLE hd = (HANDLE)fd;  /* Extract the serial number from the card ID @id and return it. */
320      void *item;  const char*
321      const char *keyid, *pass;  extract_serial_no (const char *id)
322      DWORD n;  {
323      int rc;      static char buf[8];
324        char *p;
325      if (!c)  
326          return gpg_error (GPG_ERR_INV_ARG);      p = strchr (id, '/');
327      c->bad_pwd = prev_was_bad? 1 : 0;      if (!p) {
328      if (prev_was_bad && !c->cancel) {          log_debug ("extract_serial_no: error '%s'\r\n", id);
329          if (c->pwd)          return NULL;
330              burn_passphrase (&c->pwd);      }
331          agent_del_cache (c->keyid);      strncpy (buf, id+(p-id)-6, 6);
332          c->pwd_init = 1;      return buf;
333      }  }
334    
335      if (passphrase_info) {  
336          if (strlen (passphrase_info) < 16 &&  /* Passphrase callback with the ability to support caching. */
337              !strstr (passphrase_info, "OPENPGP")) {/* assume symetric encryption. */  gpgme_error_t
338              int n=2;  passphrase_cb (void *hook, const char *uid_hint,
339              c->sym.sym_algo = atoi (passphrase_info);                 const char *passphrase_info,
340              if (c->sym.sym_algo > 9)                 int prev_was_bad, int fd)
341                  n++;  {
342              /* XXX: be more strict. */      passphrase_cb_s *c = (passphrase_cb_s*)hook;
343              c->sym.s2k_mode = atoi (passphrase_info+n);      HANDLE hd = (HANDLE)fd;
344              c->sym.s2k_hash = atoi (passphrase_info+n+2);      void *item;
345          }      const char *keyid=NULL, *pass;
346        DWORD n;
347          keyid = parse_gpg_keyid (passphrase_info);      int rc = 0;
348          pass = agent_get_cache (keyid+8, &item);  
349          if (pass) {      if (!c) {
350              agent_unlock_cache_entry (&item);          log_debug ("passphrase_cb: error '!c'\r\n");
351              c->pwd_init = 0;          return gpg_error (GPG_ERR_INV_ARG);
352              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))      }
353                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);      c->bad_pwd = prev_was_bad? 1 : 0;
354              if (!WriteFile (hd, "\n", 1, &n, NULL))      if (prev_was_bad && !c->cancel) {
355                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);          if (c->pwd)
356              return 0;              burn_passphrase (&c->pwd);
357          }          agent_del_cache (c->keyid);
358      }          c->pwd_init = 1;
359        }
360      if (c->pwd_init) {  
361          if (keyid && strlen (keyid) == 16)      if (passphrase_info) {
362              strcpy (c->keyid, keyid+8);          if (strlen (passphrase_info) < 16 &&
363                !strstr (passphrase_info, "OPENPGP")) {
364          /* if @passphrase_info contains 'OPENPGP' we assume a smart card              /* assume symetric encryption. */
365              has been used. */              int pos=2;
366          if (strstr (passphrase_info, "OPENPGP")) {              c->sym.sym_algo = atoi (passphrase_info);
367              const char *s=passphrase_info;              if (c->sym.sym_algo > 9)
368              while (s && *s && *s != 'D')                  pos++;
369                  s++;              /* XXX: be more strict. */
370              _snprintf (c->info, sizeof c->info-1,              c->sym.s2k_mode = atoi (passphrase_info+pos);
371                         _("Please enter the PIN to unlock your secret card key\n"              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
372                           "Card: %s"), extract_serial_no (s));          }
373              c->is_card = 1;  
374          }          keyid = parse_gpg_keyid (passphrase_info);
375          else if (uid_hint)          pass = agent_get_cache (keyid+8, &item);        
376              parse_gpg_description (uid_hint, passphrase_info,          if (pass) {
377                                     c->info, sizeof c->info - 1);              agent_unlock_cache_entry (&item);
378          if (c->gpg_cmd == GPG_CMD_DECRYPT) {              c->pwd_init = 0;
379              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
380                                   (HWND)c->hwnd, passphrase_callback_proc,                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
381                                   (LPARAM)c);              if (!WriteFile (hd, "\n", 1, &n, NULL))
382          }                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
383          else if (c->gpg_cmd == GPG_CMD_SIGN) {              return 0;
384              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,          }
385                                   (HWND)c->hwnd, passphrase_callback_proc,      }
386                                   (LPARAM)c);  
387          }      if (c->pwd_init) {
388          if (rc == -1) {          if (keyid && strlen (keyid) == 16)
389              WriteFile (hd, "\n", 1, &n, NULL);              strcpy (c->keyid, keyid+8);
390              return 0;  
391          }          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
392          c->pwd_init = 0;              has been used. */
393      }          if (strstr (passphrase_info, "OPENPGP")) {
394      if (c->cancel) {              const char *s=passphrase_info;
395          WriteFile (hd, "\n", 1, &n, NULL);              while (s && *s && *s != 'D')
396          return 0;                  s++;
397      }              _snprintf (c->info, sizeof c->info-1,
398                           _("Please enter the PIN to unlock your secret card key\n"
399      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);                           "Card: %s"), extract_serial_no (s));
400      WriteFile (hd, "\n", 1, &n, NULL);              c->is_card = 1;
401      return 0;          }
402  }          else if (uid_hint)
403                parse_gpg_description (uid_hint, passphrase_info,
404                                       c->info, sizeof (c->info) - 1);
405  /* Initialize the given passphrase callback @cb with the          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
406     used gpgme context @ctx, the command @cmd and a title              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
407     @title for the dialog. */                                   (HWND)c->hwnd, passphrase_callback_proc,
408  void                                   (LPARAM)c);
409  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,          }
410                         int cmd, HWND hwnd, const char *title)          else if (c->gpg_cmd == GPG_CMD_SIGN) {
411  {              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
412      memset (cb, 0, sizeof *cb);                                   (HWND)c->hwnd, passphrase_callback_proc,
413      cb->gpg_cmd = cmd;                                   (LPARAM)c);
414      cb->bad_pwd = 0;          }
415      cb->is_card = 0;          if (rc == -1) {
416      cb->cancel = 0;              if (!WriteFile (hd, "\n", 1, &n, NULL))
417      cb->hwnd = hwnd;                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
418      cb->pwd_init = 1;              return 0;
419      free_if_alloc (cb->title);          }
420      cb->title = m_strdup (title);          c->pwd_init = 0;
421      if (!cb->title)      }
422          BUG (NULL);      if (c->cancel) {
423      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);          if (!WriteFile (hd, "\n", 1, &n, NULL))
424      cb->gpg = ctx;              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
425  }          return 0;
426        }
427    
428  /* Release a passphrase callback @ctx. */      if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
429  void          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
430  release_gpg_passphrase_cb (passphrase_cb_s *ctx)      if (!WriteFile (hd, "\n", 1, &n, NULL))
431  {          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
432      if (!ctx)      return 0;
433          return;  }
434      sfree_if_alloc (ctx->pwd);  
435      free_if_alloc (ctx->title);  
436  }  /* Initialize the given passphrase callback @cb with the
437       used gpgme context @ctx, the command @cmd and a title
438       @title for the dialog. */
439  /* Simple check to measure passphrase (@pass) quality.  void
440     Return value: 0 on success. */  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
441  int                         int cmd, HWND hwnd, const char *title)
442  check_passwd_quality (const char *pass, int strict)  {
443  {      memset (cb, 0, sizeof *cb);
444      int i, nd=0, nc=0, n;      cb->gpg_cmd = cmd;
445        cb->bad_pwd = 0;
446      n = strlen (pass);      cb->is_card = 0;
447      if (n < 8)      cb->cancel = 0;
448          return -1;      cb->hwnd = hwnd;
449        cb->pwd_init = 1;
450      for (i=0; i < n; i++) {      free_if_alloc (cb->title);
451          if (isdigit (pass[i])) nd++;      cb->title = m_strdup (title);
452          if (isalpha (pass[i])) nc++;      if (!cb->title)
453      }          BUG (NULL);
454        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
455      if (nd == n || nc == n)      cb->gpg = ctx;
456          return -1;  }
457    
458      return 0;  
459  }  /* Release a passphrase callback @ctx. */
460    void
461    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
462    {
463        gpgme_recipient_t r, n;
464    
465        if (!ctx)
466            return;
467        sfree_if_alloc (ctx->pwd);
468        free_if_alloc (ctx->title);
469        r = ctx->recipients;
470        while (r) {
471            n = r->next;
472            safe_free (r->keyid);
473            safe_free (r);
474            r = n;
475        }
476    }
477    
478    
479    /* Simple check to measure passphrase (@pass) quality.
480       Return value: 0 on success. */
481    int
482    check_passwd_quality (const char *pass, int strict)
483    {
484        int i, nd=0, nc=0, n;
485    
486        n = strlen (pass);
487        if (n < 8)
488            return -1;
489    
490        for (i=0; i < n; i++) {
491            if (isdigit (pass[i]))
492                nd++;
493            if (isalpha (pass[i]))
494                nc++;
495        }
496    
497        /* check that the passphrase contains letters and numbers. */
498        if (nd == n || nc == n)
499            return -1;
500    
501        return 0;
502    }
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