/[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 214 by twoaday, Sun May 14 18:40:36 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, 2006 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 "wptErrors.h"
38  #include "wptRegistry.h"  #include "wptTypes.h"
39    #include "wptKeylist.h"
40  const char* get_symkey_algo (int algo);  #include "wptAgent.h"
41    #include "wptRegistry.h"
42  #define item_ctrl_id( cmd ) \  #include "wptUTF8.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;    void ListBox_AddString_utf8 (HWND lb, const char *txt);
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=NULL;
72        gpgme_sign_result_t res_sig=NULL;
73      /* XXX: we need a timer to update the 'enc_to' entries. */      gpgme_key_t key;
74      switch (msg) {      gpgme_recipient_t recip=NULL, r;
75      case WM_INITDIALOG:      void *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_ACTIVATE:
82                  _("Encrypted with the following public key(s)") );          safe_edit_control_init (dlg, item_ctrl_id (c->gpg_cmd));
83              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );          break;
84          }  
85          else if (c->gpg_cmd == GPG_CMD_SIGN)      case WM_DESTROY:
86              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);          safe_edit_control_free (dlg, item_ctrl_id (c->gpg_cmd));
87          res = gpgme_op_decrypt_result (c->gpg);          break;
88          if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {  
89              gpgme_recipient_t r;      case WM_INITDIALOG:
90            c = (passphrase_cb_s *)lparam;
91              /* XXX: not all ENCRYPT_TO entries are listed here. */          if (!c)
92              for (r = res->recipients; r; r = r->next) {              BUG (0);
93                  get_pubkey (r->keyid, &key);          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
94                  if (key) {          SetWindowText (dlg, c->title);
95                      char *uid;          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
96                      id = key->uids->name;              SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
97                      if (!id)              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
98                          id = _("Invalid User ID");                              _("Encrypted with the following public key(s)"));
99                      uid = utf8_to_wincp (id, strlen (id));              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
100                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1          }
101                                       + strlen (key->uids->email)+1];          else if (c->gpg_cmd == GPG_CMD_SIGN) {
102                      if (!info)              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
103                          BUG (NULL);              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
104                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,          }
105                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);          /* Because it depends on the order the keys are stored in the
106                      free (uid);             keyring whether res->recipients is complete or not, we also
107                                   support that the recipients were externally extracted and then
108                  }             we use this list. */
109                  else {          if (c->recipients)
110                      info = new char [32 + strlen (r->keyid)+1 + 4];              recip = c->recipients; /* recipients were already extracted. */
111                      if (!info)          else {
112                          BUG (NULL);              res = gpgme_op_decrypt_result (c->gpg);
113                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),              if (res && res->recipients)
114                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                  recip = res->recipients;
115                  }          }
116                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
117                  free_if_alloc (info);              for (r = recip; r; r = r->next) {
118              }                  get_pubkey (r->keyid, &key);
119          }                  if (key) {
120          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                      gpgme_user_id_t u = key->uids;
121              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);  
122          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?                      id = u->name;
123                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                      if (!id)
124                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :                          id = _("Invalid User ID");
125                          _("Please enter your passphrase"));                      n = 32+strlen (id)+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)", id,
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)", id, u->email,
136                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
137                  free_if_alloc (info);                  }
138              }                  else {
139              else                      info = new char [32 + strlen (r->keyid)+1 + 4];
140                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                      if (!info)
141          }                          BUG (NULL);
142          else {                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
143              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
144              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);                  }
145          }                  ListBox_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
146          center_window (dlg, NULL);                  free_if_alloc (info);
147          SetForegroundWindow (dlg);              }
148          set_active_window (dlg);          }
149          return FALSE;          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
150                EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
151          case WM_SYSCOMMAND:          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
152              if (LOWORD (wparam) == SC_CLOSE) {                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
153                  SetDlgItemText (dlg, item_ctrl_id( c->gpg_cmd ), "");                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
154                  c->cancel = 1;                          _("Please enter your passphrase"));
155                  EndDialog (dlg, TRUE);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
156              }              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
157              break;              if (res && !res->recipients) {
158                    const char *s = _("Symmetric encryption.\n"
159          case WM_COMMAND:                                    "%s encrypted data.");
160              switch( HIWORD( wparam ) ) {                  const char *alg = get_symkey_algo (c->sym.sym_algo);
161              case BN_CLICKED:                  info = new char[strlen (s) + strlen (alg) + 2];
162                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE                  if (!info)
163                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                      BUG (NULL);
164                      HWND hwnd;                  sprintf (info, s, alg);
165                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
166                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));                  free_if_alloc (info);
167                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);              }
168                      SetFocus (hwnd);              else
169                  }                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
170              }          }
171            else {
172              switch (LOWORD (wparam)) {              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
173              case IDOK:                SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
174                  /* fixme: the item is even cached when the passphrase is not          }
175                            correct, which means that the user needs to delete all          center_window (dlg, NULL);
176                            cached entries to continue. */          SetForegroundWindow (dlg);
177                  if (c->pwd)          return FALSE;
178                      burn_passphrase (&c->pwd);  
179                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));          case WM_SYSCOMMAND:
180                  if (!n) {              if (LOWORD (wparam) == SC_CLOSE) {
181                      c->pwd = new char[2];                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
182                      if (!c->pwd)                  c->cancel = 1;
183                          BUG (NULL);                  EndDialog (dlg, TRUE);
184                      strcpy (c->pwd, "");              }
185                  }              break;
186                  else {  
187                      c->pwd = new char[n+2];          case WM_COMMAND:
188                      if (!c->pwd)              switch (HIWORD (wparam)) {
189                          BUG (NULL);              case BN_CLICKED:
190                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
191                  }                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
192                  res = gpgme_op_decrypt_result (c->gpg);                      HWND hwnd;
193                  if (!res)                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
194                      res_sig = gpgme_op_sign_result (c->gpg);                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
195                  if (reg_prefs.cache_time > 0 && !c->is_card &&                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
196                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                      SetFocus (hwnd);
197                      if (agent_get_cache (c->keyid, &item))                  }
198                          agent_unlock_cache_entry (&item);              }
199                      else  
200                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);              switch (LOWORD (wparam)) {
201                  }              case IDOK:  
202                  EndDialog (dlg, TRUE);                  /* XXX: the item is even cached when the passphrase is not
203                  return TRUE;                          correct, which means that the user needs to delete all
204                                            cached entries to continue. */
205              case IDCANCEL:                  if (c->pwd)
206                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                      burn_passphrase (&c->pwd);
207                  c->cancel = 1;                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
208                  EndDialog (dlg, FALSE);                  if (!n) {
209                  return FALSE;                      c->pwd = new char[2];
210              }                      if (!c->pwd)
211              break;                          BUG (NULL);
212      }                      strcpy (c->pwd, "");
213                        }
214      return FALSE;                  else {
215  }                      c->pwd = new char[n+2];
216                        if (!c->pwd)
217                            BUG (NULL);
218  /* Extract the main keyid from @pass_info.                      SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd),
219     Return value: long main keyid or NULL for an error. */                                          c->pwd, n+1);
220  static const char*                  }
221  parse_gpg_keyid (const char *pass_info)                  res = gpgme_op_decrypt_result (c->gpg);
222  {                  if (!res)
223      static char keyid[16+1];                      res_sig = gpgme_op_sign_result (c->gpg);            
224                        if (reg_prefs.cache_time > 0 && !c->is_card &&
225      /* XXX: check for leading alpha-chars? */                      (res || res_sig)) {
226      if (strlen (pass_info) < 16)                      if (agent_get_cache (c->keyid, &item))                      
227          return NULL;                          agent_unlock_cache_entry (&item);
228      /* the format of the desc buffer looks like this:                      else
229         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
230         we use the main keyid to use only one cache entry. */                  }
231      strncpy (keyid, pass_info+17, 16);                  c->cancel = 0;
232      keyid[16] = 0;                  EndDialog (dlg, TRUE);
233      return keyid;                  return TRUE;
234  }                  
235                case IDCANCEL:
236                    SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
237  /* Parse the information in @uid_hint and @pass_info to generate                  c->cancel = 1;
238     a input message for the user in @desc. */                  EndDialog (dlg, FALSE);
239  static int                  return FALSE;
240  parse_gpg_description (const char *uid_hint, const char *pass_info,              }
241                         char *desc, int size)              break;
242  {      }
243      gpgme_pubkey_algo_t algo;      
244      char usedkey[16+1], mainkey[16+1];      return FALSE;
245      char *uid, *p;  }
246      int n=0;  
247    
248      if (strlen (uid_hint) < 17) {  /* Extract the main keyid from @pass_info.
249          *desc = 0;     Return value: long main keyid or NULL for an error. */
250          return -1;  static const char*
251      }  parse_gpg_keyid (const char *pass_info)
252    {
253      while (p = strsep ((char**)&pass_info, " ")) {      static char keyid[16+1];
254          switch (n++) {      
255          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;      /* XXX: check for leading alpha-chars? */
256          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;      if (strlen (pass_info) < 16) {
257          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
258          }          return NULL;
259      }      }
260      uid_hint += 16; /* skip keyid */      /* the format of the desc buffer looks like this:
261      uid_hint += 1;  /* space */         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
262           we use the main keyid to use only one cache entry. */
263      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));      strncpy (keyid, pass_info+17, 16);
264        keyid[16] = 0;
265      if (strcmp (usedkey, mainkey))      return keyid;
266          _snprintf (desc, size-1,  }
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"),  /* Parse the information in @uid_hint and @pass_info to generate
270                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);     a input message for the user in @desc. */
271      else if (!strcmp (usedkey, mainkey))  static int
272          _snprintf (desc, size-1,  parse_gpg_description (const char *uid_hint, const char *pass_info,
273                     _("You need a passphrase to unlock the secret key for\n"                         char *desc, int size)
274                       "user: \"%s\"\n"  {
275                       "%s key, ID %s\n"),      gpgme_pubkey_algo_t algo;
276                       uid, get_key_pubalgo (algo), usedkey+8);      char usedkey[16+1];
277      free (uid);      char mainkey[16+1];
278      return 0;      char *p, *uid;
279  }      int n=0;
280    
281        algo = (gpgme_pubkey_algo_t)0;
282  /*      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
283  static int inline      if (strlen (uid_hint) < 17) {
284  is_hexstring (const char * p)          *desc = 0;
285  {          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
286      size_t i;          return -1;
287        }
288      for (i=0; i < strlen (p); i++) {  
289          if (!isxdigit (p[i]))      while (p = strsep ((char**)&pass_info, " ")) {
290              return -1;          switch (n++) {
291      }          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
292      return 0;          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
293  }          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
294  */          }
295        }
296        uid_hint += 16; /* skip keyid */
297  /* Extract the serial number from the card ID @id and return it. */      uid_hint += 1;  /* space */
298  const char*  
299  extract_serial_no (const char *id)      uid = utf8_to_native (uid_hint);
300  {      if (strcmp (usedkey, mainkey))
301      static char buf[8];          _snprintf (desc, size-1,
302      char *p;                     _("You need a passphrase to unlock the secret key for\n"
303                         "user: \"%s\"\n"
304      p = strchr (id, '/');                       "%s key, ID %s (main key ID %s)\n"),
305      if (!p)                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
306          return NULL;      else if (!strcmp (usedkey, mainkey))
307      strncpy (buf, id+(p-id)-6, 6);          _snprintf (desc, size-1,
308      return buf;                     _("You need a passphrase to unlock the secret key for\n"
309  }                       "user: \"%s\"\n"
310                         "%s key, ID %s\n"),
311                         uid, get_key_pubalgo (algo), usedkey+8);
312  /* Passphrase callback with the ability to support caching. */      safe_free (uid);
313  gpgme_error_t      return 0;
314  passphrase_cb (void *hook, const char *uid_hint,  }
315                 const char *passphrase_info,  
316                 int prev_was_bad, int fd)  
317  {  /* Extract the serial number from the card ID @id and return it. */
318      passphrase_cb_s *c = (passphrase_cb_s*)hook;  const char*
319      HANDLE hd = (HANDLE)fd;  extract_serial_no (const char *id)
320      void *item;  {
321      const char *keyid, *pass;      static char buf[8];
322      DWORD n;      char *p;
323      int rc;  
324        p = strchr (id, '/');
325      if (!c)      if (!p) {
326          return gpg_error (GPG_ERR_INV_ARG);          log_debug ("extract_serial_no: error '%s'\r\n", id);
327      c->bad_pwd = prev_was_bad? 1 : 0;          return NULL;
328      if (prev_was_bad && !c->cancel) {      }
329          if (c->pwd)      strncpy (buf, id+(p-id)-6, 6);
330              burn_passphrase (&c->pwd);      return buf;
331          agent_del_cache (c->keyid);  }
332          c->pwd_init = 1;  
333      }  
334    /* Passphrase callback with the ability to support caching. */
335      if (passphrase_info) {  gpgme_error_t
336          if (strlen (passphrase_info) < 16 &&  passphrase_cb (void *hook, const char *uid_hint,
337              !strstr (passphrase_info, "OPENPGP")) {/* assume symetric encryption. */                 const char *passphrase_info,
338              int n=2;                 int prev_was_bad, int fd)
339              c->sym.sym_algo = atoi (passphrase_info);  {
340              if (c->sym.sym_algo > 9)      passphrase_cb_s *c = (passphrase_cb_s*)hook;
341                  n++;      HANDLE hd = (HANDLE)fd;
342              /* XXX: be more strict. */      void *item;
343              c->sym.s2k_mode = atoi (passphrase_info+n);      const char *keyid=NULL, *pass;
344              c->sym.s2k_hash = atoi (passphrase_info+n+2);      DWORD n;
345          }      int rc = 0;
346    
347          keyid = parse_gpg_keyid (passphrase_info);      if (!c) {
348          pass = agent_get_cache (keyid+8, &item);          log_debug ("passphrase_cb: error '!c'\r\n");
349          if (pass) {          return gpg_error (GPG_ERR_INV_ARG);
350              agent_unlock_cache_entry (&item);      }
351              c->pwd_init = 0;      c->bad_pwd = prev_was_bad? 1 : 0;
352              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))      if (prev_was_bad && !c->cancel) {
353                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);          if (c->pwd)
354              if (!WriteFile (hd, "\n", 1, &n, NULL))              burn_passphrase (&c->pwd);
355                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);          agent_del_cache (c->keyid);
356              return 0;          c->pwd_init = 1;
357          }      }
358      }  
359        if (passphrase_info) {
360      if (c->pwd_init) {          if (strlen (passphrase_info) < 16 &&
361          if (keyid && strlen (keyid) == 16)              !strstr (passphrase_info, "OPENPGP")) {
362              strcpy (c->keyid, keyid+8);              /* assume symetric encryption. */
363                int pos=2;
364          /* if @passphrase_info contains 'OPENPGP' we assume a smart card              c->sym.sym_algo = atoi (passphrase_info);
365              has been used. */              if (c->sym.sym_algo > 9)
366          if (strstr (passphrase_info, "OPENPGP")) {                  pos++;
367              const char *s=passphrase_info;              /* XXX: be more strict. */
368              while (s && *s && *s != 'D')              c->sym.s2k_mode = atoi (passphrase_info+pos);
369                  s++;              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
370              _snprintf (c->info, sizeof c->info-1,          }
371                         _("Please enter the PIN to unlock your secret card key\n"  
372                           "Card: %s"), extract_serial_no (s));          keyid = parse_gpg_keyid (passphrase_info);
373              c->is_card = 1;          pass = agent_get_cache (keyid+8, &item);        
374          }          if (pass) {
375          else if (uid_hint)              agent_unlock_cache_entry (&item);
376              parse_gpg_description (uid_hint, passphrase_info,              c->pwd_init = 0;
377                                     c->info, sizeof c->info - 1);              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
378          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
379              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,              if (!WriteFile (hd, "\n", 1, &n, NULL))
380                                   (HWND)c->hwnd, passphrase_callback_proc,                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
381                                   (LPARAM)c);              return 0;
382          }          }
383          else if (c->gpg_cmd == GPG_CMD_SIGN) {      }
384              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,  
385                                   (HWND)c->hwnd, passphrase_callback_proc,      if (c->pwd_init) {
386                                   (LPARAM)c);          if (keyid && strlen (keyid) == 16)
387          }              strcpy (c->keyid, keyid+8);
388          if (rc == -1) {  
389              WriteFile (hd, "\n", 1, &n, NULL);          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
390              return 0;              has been used. */
391          }          if (strstr (passphrase_info, "OPENPGP")) {
392          c->pwd_init = 0;              const char *s=passphrase_info;
393      }              while (s && *s && *s != 'D')
394      if (c->cancel) {                  s++;
395          WriteFile (hd, "\n", 1, &n, NULL);              _snprintf (c->info, sizeof c->info-1,
396          return 0;                         _("Please enter the PIN to unlock your secret card key\n"
397      }                           "Card: %s"), extract_serial_no (s));
398                c->is_card = 1;
399      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);          }
400      WriteFile (hd, "\n", 1, &n, NULL);          else if (uid_hint)
401      return 0;              parse_gpg_description (uid_hint, passphrase_info,
402  }                                     c->info, sizeof (c->info) - 1);
403            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
404                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
405  /* Initialize the given passphrase callback @cb with the                                   (HWND)c->hwnd, passphrase_callback_proc,
406     used gpgme context @ctx, the command @cmd and a title                                   (LPARAM)c);
407     @title for the dialog. */          }
408  void          else if (c->gpg_cmd == GPG_CMD_SIGN) {
409  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
410                         int cmd, HWND hwnd, const char *title)                                   (HWND)c->hwnd, passphrase_callback_proc,
411  {                                   (LPARAM)c);
412      memset (cb, 0, sizeof *cb);          }
413      cb->gpg_cmd = cmd;          if (rc == -1) {
414      cb->bad_pwd = 0;              if (!WriteFile (hd, "\n", 1, &n, NULL))
415      cb->is_card = 0;                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
416      cb->cancel = 0;              return 0;
417      cb->hwnd = hwnd;          }
418      cb->pwd_init = 1;          c->pwd_init = 0;
419      free_if_alloc (cb->title);      }
420      cb->title = m_strdup (title);      if (c->cancel || !c->pwd) {
421      if (!cb->title)          if (!WriteFile (hd, "\n", 1, &n, NULL))
422          BUG (NULL);              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
423      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);          return 0;
424      cb->gpg = ctx;      }
425  }  
426        if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
427            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
428  /* Release a passphrase callback @ctx. */      if (!WriteFile (hd, "\n", 1, &n, NULL))
429  void          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
430  release_gpg_passphrase_cb (passphrase_cb_s *ctx)      return 0;
431  {  }
432      if (!ctx)  
433          return;  
434      sfree_if_alloc (ctx->pwd);  /* Initialize the given passphrase callback @cb with the
435      free_if_alloc (ctx->title);     used gpgme context @ctx, the command @cmd and a title
436  }     @title for the dialog. */
437    void
438    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
439  /* Simple check to measure passphrase (@pass) quality.                         int cmd, HWND hwnd, const char *title)
440     Return value: 0 on success. */  {
441  int      memset (cb, 0, sizeof *cb);
442  check_passwd_quality (const char *pass, int strict)      cb->gpg_cmd = cmd;
443  {      cb->bad_pwd = 0;
444      int i, nd=0, nc=0, n;      cb->is_card = 0;
445        cb->cancel = 0;
446      n = strlen (pass);      cb->hwnd = hwnd;
447      if (n < 8)      cb->pwd_init = 1;
448          return -1;      free_if_alloc (cb->title);
449        cb->title = m_strdup (title);
450      for (i=0; i < n; i++) {      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
451          if (isdigit (pass[i])) nd++;      cb->gpg = ctx;
452          if (isalpha (pass[i])) nc++;  }
453      }  
454    
455      if (nd == n || nc == n)  /* Release the gpg recipient list. */
456          return -1;  void
457    release_gpg_recipients (gpgme_recipient_t *recipients)
458      return 0;  {
459  }      gpgme_recipient_t r, n;
460    
461        r = *recipients;
462        while (r != NULL) {
463            n = r->next;
464            safe_free (r->keyid);
465            safe_free (r);
466            r = n;
467        }
468        *recipients = NULL;
469    }
470    
471    
472    
473    /* Release a passphrase callback @ctx. */
474    void
475    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
476    {
477        if (!ctx)
478            return;
479        sfree_if_alloc (ctx->pwd);
480        free_if_alloc (ctx->title);
481        release_gpg_recipients (&ctx->recipients);
482    }
483    
484    
485    /* Simple check to measure passphrase (@pass) quality.
486       Return value: 0 on success. */
487    int
488    check_passwd_quality (const char *pass, int strict)
489    {
490        int i, nd=0, nc=0, n;
491    
492        n = strlen (pass);
493        if (n < 8)
494            return -1;
495    
496        for (i=0; i < n; i++) {
497            if (isdigit (pass[i]))
498                nd++;
499            if (isalpha (pass[i]))
500                nc++;
501        }
502    
503        /* check that the passphrase contains letters and numbers. */
504        if (nd == n || nc == n)
505            return -1;
506    
507        return 0;
508    }
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