/[winpt]/trunk/Src/wptPassphraseCB.cpp
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revision 27 by twoaday, Tue Oct 18 07:57:13 2005 UTC revision 77 by twoaday, Mon Nov 14 15:01:01 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      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_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 );          SetWindowText (dlg, c->title);
84          }          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
85          else if (c->gpg_cmd == GPG_CMD_SIGN)              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
86              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);                              _("Encrypted with the following public key(s)"));
87          res = gpgme_op_decrypt_result (c->gpg);              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
88          if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {          }
89              gpgme_recipient_t r;          else if (c->gpg_cmd == GPG_CMD_SIGN)
90                CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
91              /* XXX: not all ENCRYPT_TO entries are listed here. */          if (c->recipients)
92              for (r = res->recipients; r; r = r->next) {              recip = c->recipients; /* recipients were already extracted. */
93                  get_pubkey (r->keyid, &key);          else {
94                  if (key) {              /* XXX: not all ENCRYPT_TO entries are listed here. */
95                      char *uid;              res = gpgme_op_decrypt_result (c->gpg);
96                      id = key->uids->name;              if (res && res->recipients)
97                      if (!id)                  recip = res->recipients;
98                          id = _("Invalid User ID");          }
99                      uid = utf8_to_wincp (id, strlen (id));          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
100                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1              for (r = res->recipients; r; r = r->next) {
101                                       + strlen (key->uids->email)+1];                  get_pubkey (r->keyid, &key);
102                      if (!info)                  if (key) {
103                          BUG (NULL);                      char *uid;
104                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,                      id = key->uids->name;
105                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                      if (!id)
106                      free (uid);                          id = _("Invalid User ID");
107                                            uid = utf8_to_wincp (id, strlen (id));
108                  }                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1
109                  else {                                       + strlen (key->uids->email)+1];
110                      info = new char [32 + strlen (r->keyid)+1 + 4];                      if (!info)
111                      if (!info)                          BUG (NULL);
112                          BUG (NULL);                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,
113                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
114                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                      free (uid);
115                  }                      
116                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);                  }
117                  free_if_alloc (info);                  else {
118              }                      info = new char [32 + strlen (r->keyid)+1 + 4];
119          }                      if (!info)
120          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                          BUG (NULL);
121              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
122          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
123                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                  }
124                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
125                          _("Please enter your passphrase"));                  free_if_alloc (info);
126          if (c->gpg_cmd == GPG_CMD_DECRYPT) {              }
127              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));          }
128              if (res && !res->recipients) {          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
129                  const char *s = _("Symmetric encryption.\n"              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
130                                    "%s encrypted data.");          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
131                  const char *alg = get_symkey_algo (c->sym.sym_algo);                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
132                  info = new char[strlen (s) + strlen (alg) + 2];                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
133                  if (!info)                          _("Please enter your passphrase"));
134                      BUG (NULL);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
135                  sprintf (info, s, alg);              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
136                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);              if (res && !res->recipients) {
137                  free_if_alloc (info);                  const char *s = _("Symmetric encryption.\n"
138              }                                    "%s encrypted data.");
139              else                  const char *alg = get_symkey_algo (c->sym.sym_algo);
140                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                  info = new char[strlen (s) + strlen (alg) + 2];
141          }                  if (!info)
142          else {                      BUG (NULL);
143              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));                  sprintf (info, s, alg);
144              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
145          }                  free_if_alloc (info);
146          center_window (dlg, NULL);              }
147          SetForegroundWindow (dlg);              else
148          set_active_window (dlg);                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
149          return FALSE;          }
150            else {
151          case WM_SYSCOMMAND:              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
152              if (LOWORD (wparam) == SC_CLOSE) {              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
153                  SetDlgItemText (dlg, item_ctrl_id( c->gpg_cmd ), "");          }
154                  c->cancel = 1;          center_window (dlg, NULL);
155                  EndDialog (dlg, TRUE);          SetForegroundWindow (dlg);
156              }          set_active_window (dlg);
157              break;          return FALSE;
158    
159          case WM_COMMAND:          case WM_SYSCOMMAND:
160              switch( HIWORD( wparam ) ) {              if (LOWORD (wparam) == SC_CLOSE) {
161              case BN_CLICKED:                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
162                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE                  c->cancel = 1;
163                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                  EndDialog (dlg, TRUE);
164                      HWND hwnd;              }
165                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));              break;
166                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));  
167                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);          case WM_COMMAND:
168                      SetFocus (hwnd);              switch (HIWORD (wparam)) {
169                  }              case BN_CLICKED:
170              }                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
171                        || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
172              switch (LOWORD (wparam)) {                      HWND hwnd;
173              case IDOK:                        int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
174                  /* fixme: the item is even cached when the passphrase is not                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
175                            correct, which means that the user needs to delete all                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
176                            cached entries to continue. */                      SetFocus (hwnd);
177                  if (c->pwd)                  }
178                      burn_passphrase (&c->pwd);              }
179                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));  
180                  if (!n) {              switch (LOWORD (wparam)) {
181                      c->pwd = new char[2];              case IDOK:  
182                      if (!c->pwd)                  /* XXX: the item is even cached when the passphrase is not
183                          BUG (NULL);                          correct, which means that the user needs to delete all
184                      strcpy (c->pwd, "");                          cached entries to continue. */
185                  }                  if (c->pwd)
186                  else {                      burn_passphrase (&c->pwd);
187                      c->pwd = new char[n+2];                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
188                      if (!c->pwd)                  if (!n) {
189                          BUG (NULL);                      c->pwd = new char[2];
190                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);                      if (!c->pwd)
191                  }                          BUG (NULL);
192                  res = gpgme_op_decrypt_result (c->gpg);                      strcpy (c->pwd, "");
193                  if (!res)                  }
194                      res_sig = gpgme_op_sign_result (c->gpg);                  else {
195                  if (reg_prefs.cache_time > 0 && !c->is_card &&                      c->pwd = new char[n+2];
196                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                      if (!c->pwd)
197                      if (agent_get_cache (c->keyid, &item))                          BUG (NULL);
198                          agent_unlock_cache_entry (&item);                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
199                      else                  }
200                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                  res = gpgme_op_decrypt_result (c->gpg);
201                  }                  if (!res)
202                  EndDialog (dlg, TRUE);                      res_sig = gpgme_op_sign_result (c->gpg);            
203                  return TRUE;                  if (reg_prefs.cache_time > 0 && !c->is_card &&
204                                        (res || res_sig)) {
205              case IDCANCEL:                      if (agent_get_cache (c->keyid, &item))                      
206                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                          agent_unlock_cache_entry (&item);
207                  c->cancel = 1;                      else
208                  EndDialog (dlg, FALSE);                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
209                  return FALSE;                  }
210              }                  c->cancel = 0;
211              break;                  EndDialog (dlg, TRUE);
212      }                  return TRUE;
213                        
214      return FALSE;              case IDCANCEL:
215  }                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
216                    c->cancel = 1;
217                    EndDialog (dlg, FALSE);
218  /* Extract the main keyid from @pass_info.                  return FALSE;
219     Return value: long main keyid or NULL for an error. */              }
220  static const char*              break;
221  parse_gpg_keyid (const char *pass_info)      }
222  {      
223      static char keyid[16+1];      return FALSE;
224        }
225      /* XXX: check for leading alpha-chars? */  
226      if (strlen (pass_info) < 16)  
227          return NULL;  /* Extract the main keyid from @pass_info.
228      /* the format of the desc buffer looks like this:     Return value: long main keyid or NULL for an error. */
229         request_keyid[16] main_keyid[16] keytype[1] keylength[4]  static const char*
230         we use the main keyid to use only one cache entry. */  parse_gpg_keyid (const char *pass_info)
231      strncpy (keyid, pass_info+17, 16);  {
232      keyid[16] = 0;      static char keyid[16+1];
233      return keyid;      
234  }      /* XXX: check for leading alpha-chars? */
235        if (strlen (pass_info) < 16) {
236            log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
237  /* Parse the information in @uid_hint and @pass_info to generate          return NULL;
238     a input message for the user in @desc. */      }
239  static int      /* the format of the desc buffer looks like this:
240  parse_gpg_description (const char *uid_hint, const char *pass_info,         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
241                         char *desc, int size)         we use the main keyid to use only one cache entry. */
242  {      strncpy (keyid, pass_info+17, 16);
243      gpgme_pubkey_algo_t algo;      keyid[16] = 0;
244      char usedkey[16+1], mainkey[16+1];      return keyid;
245      char *uid, *p;  }
246      int n=0;  
247    
248      if (strlen (uid_hint) < 17) {  /* Parse the information in @uid_hint and @pass_info to generate
249          *desc = 0;     a input message for the user in @desc. */
250          return -1;  static int
251      }  parse_gpg_description (const char *uid_hint, const char *pass_info,
252                           char *desc, int size)
253      while (p = strsep ((char**)&pass_info, " ")) {  {
254          switch (n++) {      gpgme_pubkey_algo_t algo;
255          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;      char usedkey[16+1];
256          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;      char mainkey[16+1];
257          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;      char *uid, *p;
258          }      int n=0;
259      }  
260      uid_hint += 16; /* skip keyid */      algo = (gpgme_pubkey_algo_t)0;
261      uid_hint += 1;  /* space */      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
262        if (strlen (uid_hint) < 17) {
263      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));          *desc = 0;
264            log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
265      if (strcmp (usedkey, mainkey))          return -1;
266          _snprintf (desc, size-1,      }
267                     _("You need a passphrase to unlock the secret key for\n"  
268                       "user: \"%s\"\n"      while (p = strsep ((char**)&pass_info, " ")) {
269                       "%s key, ID %s (main key ID %s)\n"),          switch (n++) {
270                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
271      else if (!strcmp (usedkey, mainkey))          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
272          _snprintf (desc, size-1,          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
273                     _("You need a passphrase to unlock the secret key for\n"          }
274                       "user: \"%s\"\n"      }
275                       "%s key, ID %s\n"),      uid_hint += 16; /* skip keyid */
276                       uid, get_key_pubalgo (algo), usedkey+8);      uid_hint += 1;  /* space */
277      free (uid);  
278      return 0;      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
279  }  
280        if (strcmp (usedkey, mainkey))
281            _snprintf (desc, size-1,
282  /*                     _("You need a passphrase to unlock the secret key for\n"
283  static int inline                       "user: \"%s\"\n"
284  is_hexstring (const char * p)                       "%s key, ID %s (main key ID %s)\n"),
285  {                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
286      size_t i;      else if (!strcmp (usedkey, mainkey))
287            _snprintf (desc, size-1,
288      for (i=0; i < strlen (p); i++) {                     _("You need a passphrase to unlock the secret key for\n"
289          if (!isxdigit (p[i]))                       "user: \"%s\"\n"
290              return -1;                       "%s key, ID %s\n"),
291      }                       uid, get_key_pubalgo (algo), usedkey+8);
292      return 0;      free (uid);
293  }      return 0;
294  */  }
295    
296  /* Passphrase callback with the ability to support caching. */  
297  gpgme_error_t  /* Extract the serial number from the card ID @id and return it. */
298  passphrase_cb (void *hook, const char *uid_hint,  const char*
299                 const char *passphrase_info,  extract_serial_no (const char *id)
300                 int prev_was_bad, int fd)  {
301  {      static char buf[8];
302      passphrase_cb_s *c = (passphrase_cb_s*)hook;      char *p;
303      HANDLE hd = (HANDLE)fd;  
304      void *item;      p = strchr (id, '/');
305      const char *keyid, *pass;      if (!p) {
306      DWORD n;          log_debug ("extract_serial_no: error '%s'\r\n", id);
307      int rc;          return NULL;
308        }
309      if (!c)      strncpy (buf, id+(p-id)-6, 6);
310          return gpg_error (GPG_ERR_INV_ARG);      return buf;
311      c->bad_pwd = prev_was_bad? 1 : 0;  }
312      if (prev_was_bad && !c->cancel) {  
313          if (c->pwd)  
314              burn_passphrase (&c->pwd);  /* Passphrase callback with the ability to support caching. */
315          agent_del_cache (c->keyid);  gpgme_error_t
316          c->pwd_init = 1;  passphrase_cb (void *hook, const char *uid_hint,
317      }                 const char *passphrase_info,
318                   int prev_was_bad, int fd)
319      if (passphrase_info) {  {
320          if (strlen (passphrase_info) < 16 &&      passphrase_cb_s *c = (passphrase_cb_s*)hook;
321              !strstr (passphrase_info, "OPENPGP")) {/* assume symetric encryption. */      HANDLE hd = (HANDLE)fd;
322              int n=2;      void *item;
323              c->sym.sym_algo = atoi (passphrase_info);      const char *keyid=NULL, *pass;
324              if (c->sym.sym_algo > 9)      DWORD n;
325                  n++;      int rc = 0;
326              /* XXX: be more strict. */  
327              c->sym.s2k_mode = atoi (passphrase_info+n);      if (!c) {
328              c->sym.s2k_hash = atoi (passphrase_info+n+2);          log_debug ("passphrase_cb: error '!c'\r\n");
329          }          return gpg_error (GPG_ERR_INV_ARG);
330        }
331          keyid = parse_gpg_keyid (passphrase_info);      c->bad_pwd = prev_was_bad? 1 : 0;
332          pass = agent_get_cache (keyid+8, &item);      if (prev_was_bad && !c->cancel) {
333          if (pass) {          if (c->pwd)
334              agent_unlock_cache_entry (&item);              burn_passphrase (&c->pwd);
335              c->pwd_init = 0;          agent_del_cache (c->keyid);
336              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))          c->pwd_init = 1;
337                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);      }
338              if (!WriteFile (hd, "\n", 1, &n, NULL))  
339                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);      if (passphrase_info) {
340              return 0;          if (strlen (passphrase_info) < 16 &&
341          }              !strstr (passphrase_info, "OPENPGP")) {
342      }              /* assume symetric encryption. */
343                int pos=2;
344      if (c->pwd_init) {              c->sym.sym_algo = atoi (passphrase_info);
345          if (keyid && strlen (keyid) == 16)              if (c->sym.sym_algo > 9)
346              strcpy (c->keyid, keyid+8);                  pos++;
347                /* XXX: be more strict. */
348          /* if @passphrase_info contains 'OPENPGP' we assume a smart card              c->sym.s2k_mode = atoi (passphrase_info+pos);
349              has been used. */              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
350          if (strstr (passphrase_info, "OPENPGP")) {          }
351              char buf[16];  
352              memset (buf, 0, sizeof buf);          keyid = parse_gpg_keyid (passphrase_info);
353              strncpy (buf, "??", 2); /* XXX: fixme we need the serial no. */          pass = agent_get_cache (keyid+8, &item);        
354              _snprintf (c->info, sizeof c->info-1,          if (pass) {
355                         _("Please enter the PIN to unlock your secret card key\n"              agent_unlock_cache_entry (&item);
356                           "Card: %s"), buf);              c->pwd_init = 0;
357              c->is_card = 1;              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
358          }                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
359          else if (uid_hint)              if (!WriteFile (hd, "\n", 1, &n, NULL))
360              parse_gpg_description (uid_hint, passphrase_info,                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
361                                     c->info, sizeof c->info - 1);              return 0;
362          if (c->gpg_cmd == GPG_CMD_DECRYPT) {          }
363              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,      }
364                                   (HWND)c->hwnd, passphrase_callback_proc,  
365                                   (LPARAM)c);      if (c->pwd_init) {
366          }          if (keyid && strlen (keyid) == 16)
367          else if (c->gpg_cmd == GPG_CMD_SIGN) {              strcpy (c->keyid, keyid+8);
368              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,  
369                                   (HWND)c->hwnd, passphrase_callback_proc,          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
370                                   (LPARAM)c);              has been used. */
371          }          if (strstr (passphrase_info, "OPENPGP")) {
372          if (rc == -1) {              const char *s=passphrase_info;
373              WriteFile (hd, "\n", 1, &n, NULL);              while (s && *s && *s != 'D')
374              return 0;                  s++;
375          }              _snprintf (c->info, sizeof c->info-1,
376          c->pwd_init = 0;                         _("Please enter the PIN to unlock your secret card key\n"
377      }                           "Card: %s"), extract_serial_no (s));
378      if (c->cancel) {              c->is_card = 1;
379          WriteFile (hd, "\n", 1, &n, NULL);          }
380          return 0;          else if (uid_hint)
381      }              parse_gpg_description (uid_hint, passphrase_info,
382                                       c->info, sizeof c->info - 1);
383      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
384      WriteFile (hd, "\n", 1, &n, NULL);              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
385      return 0;                                   (HWND)c->hwnd, passphrase_callback_proc,
386  }                                   (LPARAM)c);
387            }
388            else if (c->gpg_cmd == GPG_CMD_SIGN) {
389  /* Initialize the given passphrase callback @cb with the              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
390     used gpgme context @ctx, the command @cmd and a title                                   (HWND)c->hwnd, passphrase_callback_proc,
391     @title for the dialog. */                                   (LPARAM)c);
392  void          }
393  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,          if (rc == -1) {
394                         int cmd, HWND hwnd, const char *title)              if (!WriteFile (hd, "\n", 1, &n, NULL))
395  {                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
396      memset (cb, 0, sizeof *cb);              return 0;
397      cb->gpg_cmd = cmd;          }
398      cb->bad_pwd = 0;          c->pwd_init = 0;
399      cb->is_card = 0;      }
400      cb->cancel = 0;      if (c->cancel) {
401      cb->hwnd = hwnd;          if (!WriteFile (hd, "\n", 1, &n, NULL))
402      cb->pwd_init = 1;              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
403      free_if_alloc (cb->title);          return 0;
404      cb->title = m_strdup (title);      }
405      if (!cb->title)  
406          BUG (NULL);      if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
407      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
408      cb->gpg = ctx;      if (!WriteFile (hd, "\n", 1, &n, NULL))
409  }          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
410        return 0;
411    }
412  /* Release a passphrase callback @ctx. */  
413  void  
414  release_gpg_passphrase_cb (passphrase_cb_s *ctx)  /* Initialize the given passphrase callback @cb with the
415  {     used gpgme context @ctx, the command @cmd and a title
416      if (!ctx)     @title for the dialog. */
417          return;  void
418      sfree_if_alloc (ctx->pwd);  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
419      free_if_alloc (ctx->title);                         int cmd, HWND hwnd, const char *title)
420  }  {
421        memset (cb, 0, sizeof *cb);
422        cb->gpg_cmd = cmd;
423  /* Simple check to measure passphrase (@pass) quality.      cb->bad_pwd = 0;
424     Return value: 0 on success. */      cb->is_card = 0;
425  int      cb->cancel = 0;
426  check_passwd_quality (const char *pass, int strict)      cb->hwnd = hwnd;
427  {      cb->pwd_init = 1;
428      int i, nd=0, nc=0, n;      free_if_alloc (cb->title);
429        cb->title = m_strdup (title);
430      n = strlen (pass);      if (!cb->title)
431      if (n < 8)          BUG (NULL);
432          return -1;      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
433        cb->gpg = ctx;
434      for (i=0; i < n; i++) {  }
435          if (isdigit (pass[i])) nd++;  
436          if (isalpha (pass[i])) nc++;  
437      }  /* Release a passphrase callback @ctx. */
438    void
439      if (nd == n || nc == n)  release_gpg_passphrase_cb (passphrase_cb_s *ctx)
440          return -1;  {
441        gpgme_recipient_t r, n;
442      return 0;  
443  }      if (!ctx)
444            return;
445        sfree_if_alloc (ctx->pwd);
446        free_if_alloc (ctx->title);
447        r = ctx->recipients;
448        while (r) {
449            n = r->next;
450            safe_free (r->keyid);
451            safe_free (r);
452            r = n;
453        }
454    }
455    
456    
457    /* Simple check to measure passphrase (@pass) quality.
458       Return value: 0 on success. */
459    int
460    check_passwd_quality (const char *pass, int strict)
461    {
462        int i, nd=0, nc=0, n;
463    
464        n = strlen (pass);
465        if (n < 8)
466            return -1;
467    
468        for (i=0; i < n; i++) {
469            if (isdigit (pass[i]))
470                nd++;
471            if (isalpha (pass[i]))
472                nc++;
473        }
474    
475        /* check that the passphrase contains letters and numbers. */
476        if (nd == n || nc == n)
477            return -1;
478    
479        return 0;
480    }

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