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

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revision 27 by twoaday, Tue Oct 18 07:57:13 2005 UTC revision 48 by werner, Mon Oct 31 21:14:11 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    
45  #define item_ctrl_id2(cmd) \  
46      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)  const char* get_symkey_algo (int algo);
47    
48    #define item_ctrl_id( cmd ) \
49  /* Overwrite passphrase and free memory. */      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
50  static void  
51  burn_passphrase (char **pwd)  #define item_ctrl_id2(cmd) \
52  {      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
53      char *pass = *pwd;    
54      memset (pass, 0, strlen (pass));  
55      delete []pass;  /* Overwrite passphrase and free memory. */
56      *pwd = NULL;  static void
57  }  burn_passphrase (char **pwd)
58    {
59        char *pass = *pwd;
60  /* Dialog procedure for the passphrase callback. */      wipememory (pass, strlen (pass));
61  static BOOL CALLBACK      delete []pass;
62  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)      *pwd = NULL;
63  {      }
64      static passphrase_cb_s * c;  
65      gpgme_decrypt_result_t res;  
66      gpgme_sign_result_t res_sig;  /* Dialog procedure for the passphrase callback. */
67      gpgme_key_t key;  static BOOL CALLBACK
68      void *ctx = NULL, *item;  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
69      const char *id;  {    
70      char *info;      static passphrase_cb_s * c;
71      int n;      gpgme_decrypt_result_t res;
72        gpgme_sign_result_t res_sig;
73      /* XXX: we need a timer to update the 'enc_to' entries. */      gpgme_key_t key;
74      switch (msg) {      gpgme_recipient_t recip, r;
75      case WM_INITDIALOG:      void *ctx = NULL, *item;
76          c = (passphrase_cb_s *)lparam;      const char *id;
77          if (!c)      char *info;
78              BUG (0);      int n;
79          SetWindowText (dlg, c->title);  
80          if (c->gpg_cmd == GPG_CMD_DECRYPT) {      switch (msg) {
81              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,      case WM_INITDIALOG:
82                  _("Encrypted with the following public key(s)") );          c = (passphrase_cb_s *)lparam;
83              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );          if (!c)
84          }              BUG (0);
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          res = gpgme_op_decrypt_result (c->gpg);              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
88          if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {                              _("Encrypted with the following public key(s)"));
89              gpgme_recipient_t r;              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
90            }
91              /* XXX: not all ENCRYPT_TO entries are listed here. */          else if (c->gpg_cmd == GPG_CMD_SIGN)
92              for (r = res->recipients; r; r = r->next) {              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
93                  get_pubkey (r->keyid, &key);          if (c->recipients)
94                  if (key) {              recip = c->recipients; /* recipients were already extracted. */
95                      char *uid;          else {
96                      id = key->uids->name;              /* XXX: not all ENCRYPT_TO entries are listed here. */
97                      if (!id)              res = gpgme_op_decrypt_result (c->gpg);
98                          id = _("Invalid User ID");              if (res && res->recipients)
99                      uid = utf8_to_wincp (id, strlen (id));                  recip = res->recipients;
100                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1          }
101                                       + strlen (key->uids->email)+1];          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
102                      if (!info)              for (r = res->recipients; r; r = r->next) {
103                          BUG (NULL);                  get_pubkey (r->keyid, &key);
104                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,                  if (key) {
105                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                      char *uid;
106                      free (uid);                      id = key->uids->name;
107                                            if (!id)
108                  }                          id = _("Invalid User ID");
109                  else {                      uid = utf8_to_wincp (id, strlen (id));
110                      info = new char [32 + strlen (r->keyid)+1 + 4];                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1
111                      if (!info)                                       + strlen (key->uids->email)+1];
112                          BUG (NULL);                      if (!info)
113                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),                          BUG (NULL);
114                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,
115                  }                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
116                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);                      free (uid);
117                  free_if_alloc (info);                      
118              }                  }
119          }                  else {
120          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                      info = new char [32 + strlen (r->keyid)+1 + 4];
121              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);                      if (!info)
122          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?                          BUG (NULL);
123                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
124                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
125                          _("Please enter your passphrase"));                  }
126          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
127              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));                  free_if_alloc (info);
128              if (res && !res->recipients) {              }
129                  const char *s = _("Symmetric encryption.\n"          }
130                                    "%s encrypted data.");          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
131                  const char *alg = get_symkey_algo (c->sym.sym_algo);              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
132                  info = new char[strlen (s) + strlen (alg) + 2];          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
133                  if (!info)                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
134                      BUG (NULL);                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
135                  sprintf (info, s, alg);                          _("Please enter your passphrase"));
136                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
137                  free_if_alloc (info);              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
138              }              if (res && !res->recipients) {
139              else                  const char *s = _("Symmetric encryption.\n"
140                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                                    "%s encrypted data.");
141          }                  const char *alg = get_symkey_algo (c->sym.sym_algo);
142          else {                  info = new char[strlen (s) + strlen (alg) + 2];
143              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));                  if (!info)
144              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);                      BUG (NULL);
145          }                  sprintf (info, s, alg);
146          center_window (dlg, NULL);                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
147          SetForegroundWindow (dlg);                  free_if_alloc (info);
148          set_active_window (dlg);              }
149          return FALSE;              else
150                    SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
151          case WM_SYSCOMMAND:          }
152              if (LOWORD (wparam) == SC_CLOSE) {          else {
153                  SetDlgItemText (dlg, item_ctrl_id( c->gpg_cmd ), "");              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
154                  c->cancel = 1;              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
155                  EndDialog (dlg, TRUE);          }
156              }          center_window (dlg, NULL);
157              break;          SetForegroundWindow (dlg);
158            set_active_window (dlg);
159          case WM_COMMAND:          return FALSE;
160              switch( HIWORD( wparam ) ) {  
161              case BN_CLICKED:          case WM_SYSCOMMAND:
162                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE              if (LOWORD (wparam) == SC_CLOSE) {
163                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
164                      HWND hwnd;                  c->cancel = 1;
165                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));                  EndDialog (dlg, TRUE);
166                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));              }
167                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);              break;
168                      SetFocus (hwnd);  
169                  }          case WM_COMMAND:
170              }              switch (HIWORD (wparam)) {
171                case BN_CLICKED:
172              switch (LOWORD (wparam)) {                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
173              case IDOK:                        || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
174                  /* fixme: the item is even cached when the passphrase is not                      HWND hwnd;
175                            correct, which means that the user needs to delete all                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
176                            cached entries to continue. */                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
177                  if (c->pwd)                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
178                      burn_passphrase (&c->pwd);                      SetFocus (hwnd);
179                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));                  }
180                  if (!n) {              }
181                      c->pwd = new char[2];  
182                      if (!c->pwd)              switch (LOWORD (wparam)) {
183                          BUG (NULL);              case IDOK:  
184                      strcpy (c->pwd, "");                  /* XXX: the item is even cached when the passphrase is not
185                  }                          correct, which means that the user needs to delete all
186                  else {                          cached entries to continue. */
187                      c->pwd = new char[n+2];                  if (c->pwd)
188                      if (!c->pwd)                      burn_passphrase (&c->pwd);
189                          BUG (NULL);                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
190                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);                  if (!n) {
191                  }                      c->pwd = new char[2];
192                  res = gpgme_op_decrypt_result (c->gpg);                      if (!c->pwd)
193                  if (!res)                          BUG (NULL);
194                      res_sig = gpgme_op_sign_result (c->gpg);                      strcpy (c->pwd, "");
195                  if (reg_prefs.cache_time > 0 && !c->is_card &&                  }
196                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                  else {
197                      if (agent_get_cache (c->keyid, &item))                      c->pwd = new char[n+2];
198                          agent_unlock_cache_entry (&item);                      if (!c->pwd)
199                      else                          BUG (NULL);
200                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
201                  }                  }
202                  EndDialog (dlg, TRUE);                  res = gpgme_op_decrypt_result (c->gpg);
203                  return TRUE;                  if (!res)
204                                        res_sig = gpgme_op_sign_result (c->gpg);
205              case IDCANCEL:                  if (reg_prefs.cache_time > 0 && !c->is_card &&
206                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {
207                  c->cancel = 1;                      if (agent_get_cache (c->keyid, &item))
208                  EndDialog (dlg, FALSE);                          agent_unlock_cache_entry (&item);
209                  return FALSE;                      else
210              }                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
211              break;                  }
212      }                  c->cancel = 0;
213                        EndDialog (dlg, TRUE);
214      return FALSE;                  return TRUE;
215  }                  
216                case IDCANCEL:
217                    SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
218  /* Extract the main keyid from @pass_info.                  c->cancel = 1;
219     Return value: long main keyid or NULL for an error. */                  EndDialog (dlg, FALSE);
220  static const char*                  return FALSE;
221  parse_gpg_keyid (const char *pass_info)              }
222  {              break;
223      static char keyid[16+1];      }
224            
225      /* XXX: check for leading alpha-chars? */      return FALSE;
226      if (strlen (pass_info) < 16)  }
227          return NULL;  
228      /* the format of the desc buffer looks like this:  
229         request_keyid[16] main_keyid[16] keytype[1] keylength[4]  /* Extract the main keyid from @pass_info.
230         we use the main keyid to use only one cache entry. */     Return value: long main keyid or NULL for an error. */
231      strncpy (keyid, pass_info+17, 16);  static const char*
232      keyid[16] = 0;  parse_gpg_keyid (const char *pass_info)
233      return keyid;  {
234  }      static char keyid[16+1];
235        
236        /* XXX: check for leading alpha-chars? */
237  /* Parse the information in @uid_hint and @pass_info to generate      if (strlen (pass_info) < 16)
238     a input message for the user in @desc. */          return NULL;
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 */      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
261      uid_hint += 1;  /* space */      if (strlen (uid_hint) < 17) {
262            *desc = 0;
263      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));          return -1;
264        }
265      if (strcmp (usedkey, mainkey))  
266          _snprintf (desc, size-1,      while (p = strsep ((char**)&pass_info, " ")) {
267                     _("You need a passphrase to unlock the secret key for\n"          switch (n++) {
268                       "user: \"%s\"\n"          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
269                       "%s key, ID %s (main key ID %s)\n"),          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
270                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
271      else if (!strcmp (usedkey, mainkey))          }
272          _snprintf (desc, size-1,      }
273                     _("You need a passphrase to unlock the secret key for\n"      uid_hint += 16; /* skip keyid */
274                       "user: \"%s\"\n"      uid_hint += 1;  /* space */
275                       "%s key, ID %s\n"),  
276                       uid, get_key_pubalgo (algo), usedkey+8);      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
277      free (uid);  
278      return 0;      if (strcmp (usedkey, mainkey))
279  }          _snprintf (desc, size-1,
280                       _("You need a passphrase to unlock the secret key for\n"
281                         "user: \"%s\"\n"
282  /*                       "%s key, ID %s (main key ID %s)\n"),
283  static int inline                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
284  is_hexstring (const char * p)      else if (!strcmp (usedkey, mainkey))
285  {          _snprintf (desc, size-1,
286      size_t i;                     _("You need a passphrase to unlock the secret key for\n"
287                         "user: \"%s\"\n"
288      for (i=0; i < strlen (p); i++) {                       "%s key, ID %s\n"),
289          if (!isxdigit (p[i]))                       uid, get_key_pubalgo (algo), usedkey+8);
290              return -1;      free (uid);
291      }      return 0;
292      return 0;  }
293  }  
294  */  
295    /* Extract the serial number from the card ID @id and return it. */
296  /* Passphrase callback with the ability to support caching. */  const char*
297  gpgme_error_t  extract_serial_no (const char *id)
298  passphrase_cb (void *hook, const char *uid_hint,  {
299                 const char *passphrase_info,      static char buf[8];
300                 int prev_was_bad, int fd)      char *p;
301  {  
302      passphrase_cb_s *c = (passphrase_cb_s*)hook;      p = strchr (id, '/');
303      HANDLE hd = (HANDLE)fd;      if (!p)
304      void *item;          return NULL;
305      const char *keyid, *pass;      strncpy (buf, id+(p-id)-6, 6);
306      DWORD n;      return buf;
307      int rc;  }
308    
309      if (!c)  
310          return gpg_error (GPG_ERR_INV_ARG);  /* Passphrase callback with the ability to support caching. */
311      c->bad_pwd = prev_was_bad? 1 : 0;  gpgme_error_t
312      if (prev_was_bad && !c->cancel) {  passphrase_cb (void *hook, const char *uid_hint,
313          if (c->pwd)                 const char *passphrase_info,
314              burn_passphrase (&c->pwd);                 int prev_was_bad, int fd)
315          agent_del_cache (c->keyid);  {
316          c->pwd_init = 1;      passphrase_cb_s *c = (passphrase_cb_s*)hook;
317      }      HANDLE hd = (HANDLE)fd;
318        void *item;
319      if (passphrase_info) {      const char *keyid, *pass;
320          if (strlen (passphrase_info) < 16 &&      DWORD n;
321              !strstr (passphrase_info, "OPENPGP")) {/* assume symetric encryption. */      int rc;
322              int n=2;  
323              c->sym.sym_algo = atoi (passphrase_info);      if (!c)
324              if (c->sym.sym_algo > 9)          return gpg_error (GPG_ERR_INV_ARG);
325                  n++;      c->bad_pwd = prev_was_bad? 1 : 0;
326              /* XXX: be more strict. */      if (prev_was_bad && !c->cancel) {
327              c->sym.s2k_mode = atoi (passphrase_info+n);          if (c->pwd)
328              c->sym.s2k_hash = atoi (passphrase_info+n+2);              burn_passphrase (&c->pwd);
329          }          agent_del_cache (c->keyid);
330            c->pwd_init = 1;
331          keyid = parse_gpg_keyid (passphrase_info);      }
332          pass = agent_get_cache (keyid+8, &item);  
333          if (pass) {      if (passphrase_info) {
334              agent_unlock_cache_entry (&item);          if (strlen (passphrase_info) < 16 &&
335              c->pwd_init = 0;              !strstr (passphrase_info, "OPENPGP")) {
336              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))              /* assume symetric encryption. */
337                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);              int n=2;
338              if (!WriteFile (hd, "\n", 1, &n, NULL))              c->sym.sym_algo = atoi (passphrase_info);
339                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);              if (c->sym.sym_algo > 9)
340              return 0;                  n++;
341          }              /* XXX: be more strict. */
342      }              c->sym.s2k_mode = atoi (passphrase_info+n);
343                c->sym.s2k_hash = atoi (passphrase_info+n+2);
344      if (c->pwd_init) {          }
345          if (keyid && strlen (keyid) == 16)  
346              strcpy (c->keyid, keyid+8);          keyid = parse_gpg_keyid (passphrase_info);
347            pass = agent_get_cache (keyid+8, &item);
348          /* if @passphrase_info contains 'OPENPGP' we assume a smart card          if (pass) {
349              has been used. */              agent_unlock_cache_entry (&item);
350          if (strstr (passphrase_info, "OPENPGP")) {              c->pwd_init = 0;
351              char buf[16];              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
352              memset (buf, 0, sizeof buf);                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
353              strncpy (buf, "??", 2); /* XXX: fixme we need the serial no. */              if (!WriteFile (hd, "\n", 1, &n, NULL))
354              _snprintf (c->info, sizeof c->info-1,                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
355                         _("Please enter the PIN to unlock your secret card key\n"              return 0;
356                           "Card: %s"), buf);          }
357              c->is_card = 1;      }
358          }  
359          else if (uid_hint)      if (c->pwd_init) {
360              parse_gpg_description (uid_hint, passphrase_info,          if (keyid && strlen (keyid) == 16)
361                                     c->info, sizeof c->info - 1);              strcpy (c->keyid, keyid+8);
362          if (c->gpg_cmd == GPG_CMD_DECRYPT) {  
363              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
364                                   (HWND)c->hwnd, passphrase_callback_proc,              has been used. */
365                                   (LPARAM)c);          if (strstr (passphrase_info, "OPENPGP")) {
366          }              const char *s=passphrase_info;
367          else if (c->gpg_cmd == GPG_CMD_SIGN) {              while (s && *s && *s != 'D')
368              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,                  s++;
369                                   (HWND)c->hwnd, passphrase_callback_proc,              _snprintf (c->info, sizeof c->info-1,
370                                   (LPARAM)c);                         _("Please enter the PIN to unlock your secret card key\n"
371          }                           "Card: %s"), extract_serial_no (s));
372          if (rc == -1) {              c->is_card = 1;
373              WriteFile (hd, "\n", 1, &n, NULL);          }
374              return 0;          else if (uid_hint)
375          }              parse_gpg_description (uid_hint, passphrase_info,
376          c->pwd_init = 0;                                     c->info, sizeof c->info - 1);
377      }          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
378      if (c->cancel) {              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
379          WriteFile (hd, "\n", 1, &n, NULL);                                   (HWND)c->hwnd, passphrase_callback_proc,
380          return 0;                                   (LPARAM)c);
381      }          }
382            else if (c->gpg_cmd == GPG_CMD_SIGN) {
383      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
384      WriteFile (hd, "\n", 1, &n, NULL);                                   (HWND)c->hwnd, passphrase_callback_proc,
385      return 0;                                   (LPARAM)c);
386  }          }
387            if (rc == -1) {
388                if (!WriteFile (hd, "\n", 1, &n, NULL))
389  /* Initialize the given passphrase callback @cb with the                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
390     used gpgme context @ctx, the command @cmd and a title              return 0;
391     @title for the dialog. */          }
392  void          c->pwd_init = 0;
393  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,      }
394                         int cmd, HWND hwnd, const char *title)      if (c->cancel) {
395  {          if (!WriteFile (hd, "\n", 1, &n, NULL))
396      memset (cb, 0, sizeof *cb);              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
397      cb->gpg_cmd = cmd;          return 0;
398      cb->bad_pwd = 0;      }
399      cb->is_card = 0;  
400      cb->cancel = 0;      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);
401      cb->hwnd = hwnd;      WriteFile (hd, "\n", 1, &n, NULL);
402      cb->pwd_init = 1;      return 0;
403      free_if_alloc (cb->title);  }
404      cb->title = m_strdup (title);  
405      if (!cb->title)  
406          BUG (NULL);  /* Initialize the given passphrase callback @cb with the
407      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);     used gpgme context @ctx, the command @cmd and a title
408      cb->gpg = ctx;     @title for the dialog. */
409  }  void
410    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
411                           int cmd, HWND hwnd, const char *title)
412  /* Release a passphrase callback @ctx. */  {
413  void      memset (cb, 0, sizeof *cb);
414  release_gpg_passphrase_cb (passphrase_cb_s *ctx)      cb->gpg_cmd = cmd;
415  {      cb->bad_pwd = 0;
416      if (!ctx)      cb->is_card = 0;
417          return;      cb->cancel = 0;
418      sfree_if_alloc (ctx->pwd);      cb->hwnd = hwnd;
419      free_if_alloc (ctx->title);      cb->pwd_init = 1;
420  }      free_if_alloc (cb->title);
421        cb->title = m_strdup (title);
422        if (!cb->title)
423  /* Simple check to measure passphrase (@pass) quality.          BUG (NULL);
424     Return value: 0 on success. */      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
425  int      cb->gpg = ctx;
426  check_passwd_quality (const char *pass, int strict)  }
427  {  
428      int i, nd=0, nc=0, n;  
429    /* Release a passphrase callback @ctx. */
430      n = strlen (pass);  void
431      if (n < 8)  release_gpg_passphrase_cb (passphrase_cb_s *ctx)
432          return -1;  {
433        gpgme_recipient_t r, n;
434      for (i=0; i < n; i++) {  
435          if (isdigit (pass[i])) nd++;      if (!ctx)
436          if (isalpha (pass[i])) nc++;          return;
437      }      sfree_if_alloc (ctx->pwd);
438        free_if_alloc (ctx->title);
439      if (nd == n || nc == n)      r = ctx->recipients;
440          return -1;      while (r) {
441            n = r->next;
442      return 0;          safe_free (r->keyid);
443  }          safe_free (r);
444            r = n;
445        }
446    }
447    
448    
449    /* Simple check to measure passphrase (@pass) quality.
450       Return value: 0 on success. */
451    int
452    check_passwd_quality (const char *pass, int strict)
453    {
454        int i, nd=0, nc=0, n;
455    
456        n = strlen (pass);
457        if (n < 8)
458            return -1;
459    
460        for (i=0; i < n; i++) {
461            if (isdigit (pass[i]))
462                nd++;
463            if (isalpha (pass[i]))
464                nc++;
465        }
466    
467        /* check that the passphrase contains letters and numbers. */
468        if (nd == n || nc == n)
469            return -1;
470    
471        return 0;
472    }

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