/[winpt]/trunk/Src/wptPassphraseCB.cpp
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revision 27 by twoaday, Tue Oct 18 07:57:13 2005 UTC revision 278 by twoaday, Mon Jan 15 22:02:04 2007 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, 2002-2006 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  #ifdef HAVE_CONFIG_H
18   * along with WinPT; if not, write to the Free Software Foundation,  #include <config.h>
19   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA  #endif
20   */  
21    #include <windows.h>
22  #include <windows.h>  #include <ctype.h>
23  #include <ctype.h>  
24    #include "resource.h"
25  #include "../resource.h"  #include "wptNLS.h"
26  #include "wptNLS.h"  #include "wptW32API.h"
27  #include "wptW32API.h"  #include "wptVersion.h"
28  #include "wptVersion.h"  #include "wptGPG.h"
29  #include "wptGPG.h"  #include "wptCommonCtl.h"
30  #include "wptCommonCtl.h"  #include "wptContext.h"
31  #include "wptContext.h"  #include "wptDlgs.h"
32  #include "wptDlgs.h"  #include "wptErrors.h"
33  #include "wptUTF8.h"  #include "wptTypes.h"
34  #include "wptErrors.h"  #include "wptKeylist.h"
35  #include "wptTypes.h"  #include "wptAgent.h"
36  #include "wptKeyList.h"  #include "wptRegistry.h"
37  #include "wptAgent.h"  #include "wptUTF8.h"
38  #include "wptRegistry.h"  #include "StringBuffer.h"
39    
40  const char* get_symkey_algo (int algo);  
41    /* Return the control ID dependent on the mode (sign or decrypt). */
42  #define item_ctrl_id( cmd ) \  #define item_ctrl_id(cmd) \
43      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
44    
45  #define item_ctrl_id2(cmd) \  #define item_ctrl_id2(cmd) \
46      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
47    
48    const char* get_symkey_algo (int algo);
49  /* Overwrite passphrase and free memory. */  void ListBox_AddString_utf8 (HWND lb, const char *txt);
50  static void  
51  burn_passphrase (char **pwd)  
52  {  /* Overwrite passphrase and free memory. */
53      char *pass = *pwd;    static void
54      memset (pass, 0, strlen (pass));  burn_passphrase (char **pwd)
55      delete []pass;  {
56      *pwd = NULL;      char *pass = *pwd;
57  }  
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_recipient_t recip=NULL, r;
72        winpt_key_s key;
73      /* XXX: we need a timer to update the 'enc_to' entries. */      void *item;
74      switch (msg) {      int n;
75      case WM_INITDIALOG:  
76          c = (passphrase_cb_s *)lparam;      switch (msg) {
77          if (!c)      case WM_ACTIVATE:
78              BUG (0);          safe_edit_control_init (dlg, item_ctrl_id (c->gpg_cmd));
79          SetWindowText (dlg, c->title);          break;
80          if (c->gpg_cmd == GPG_CMD_DECRYPT) {  
81              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,      case WM_DESTROY:
82                  _("Encrypted with the following public key(s)") );          safe_edit_control_free (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_INITDIALOG:
86              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);          c = (passphrase_cb_s *)lparam;
87          res = gpgme_op_decrypt_result (c->gpg);          if (!c)
88          if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {              BUG (0);
89              gpgme_recipient_t r;          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
90            SetWindowText (dlg, c->title);
91              /* XXX: not all ENCRYPT_TO entries are listed here. */          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
92              for (r = res->recipients; r; r = r->next) {              SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
93                  get_pubkey (r->keyid, &key);              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
94                  if (key) {                              _("Encrypted with the following public key(s)"));
95                      char *uid;              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
96                      id = key->uids->name;          }
97                      if (!id)          else if (c->gpg_cmd == GPG_CMD_SIGN) {
98                          id = _("Invalid User ID");              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
99                      uid = utf8_to_wincp (id, strlen (id));              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
100                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1          }
101                                       + strlen (key->uids->email)+1];          /* Because it depends on the order the keys are stored in the
102                      if (!info)             keyring whether res->recipients is complete or not, we also
103                          BUG (NULL);             support that the recipients were externally extracted and then
104                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,             we use this list. */
105                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);          if (c->recipients)
106                      free (uid);              recip = c->recipients; /* recipients were already extracted. */
107                                else {
108                  }              res = gpgme_op_decrypt_result (c->gpg);
109                  else {              if (res && res->recipients)
110                      info = new char [32 + strlen (r->keyid)+1 + 4];                  recip = res->recipients;
111                      if (!info)          }
112                          BUG (NULL);          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
113                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),              StringBuffer inf;
114                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);  
115                  }              for (r = recip; r; r = r->next) {
116                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);                  memset (&key, 0, sizeof (key));
117                  free_if_alloc (info);                  if (!winpt_get_pubkey (r->keyid, &key)) {
118              }                      gpgme_user_id_t u = key.ctx->uids;
119          }                      
120          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                      inf = (u->name? u->name : _("Invalid User ID"));
121              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);                      if (u->email != NULL && strlen (u->email) > 1)
122          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?                          inf = inf + " <" + u->email + ">";
123                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                      inf = inf + " (" + get_key_pubalgo (r->pubkey_algo);
124                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :                      inf = inf + ", 0x" + (r->keyid+8) + ")";
125                          _("Please enter your passphrase"));                  }
126          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                  else {
127              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));                      inf = _("Unknown key ID");
128              if (res && !res->recipients) {                      inf = inf + " (" + get_key_pubalgo (r->pubkey_algo);
129                  const char *s = _("Symmetric encryption.\n"                      inf = inf + ", 0x" + (r->keyid+8) + ")";
130                                    "%s encrypted data.");                  }
131                  const char *alg = get_symkey_algo (c->sym.sym_algo);                  ListBox_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST),
132                  info = new char[strlen (s) + strlen (alg) + 2];                                          inf.getBuffer ());
133                  if (!info)                  winpt_release_pubkey (&key);
134                      BUG (NULL);              }
135                  sprintf (info, s, alg);          }
136                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
137                  free_if_alloc (info);              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
138              }          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
139              else                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
140                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
141          }                          _("Please enter your passphrase"));
142          else {          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
143              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
144              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);              if (res && !res->recipients) {
145          }                  StringBuffer sinf;
146          center_window (dlg, NULL);  
147          SetForegroundWindow (dlg);                  sinf = _("Symmetric encryption.");
148          set_active_window (dlg);                  sinf = sinf + "\n" + get_symkey_algo (c->sym.sym_algo);
149          return FALSE;                  sinf = sinf + " " + _("encrypted data.");
150                    SetDlgItemText (dlg, IDC_DECRYPT_MSG, sinf.getBuffer ());
151          case WM_SYSCOMMAND:              }
152              if (LOWORD (wparam) == SC_CLOSE) {              else
153                  SetDlgItemText (dlg, item_ctrl_id( c->gpg_cmd ), "");                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
154                  c->cancel = 1;          }
155                  EndDialog (dlg, TRUE);          else {
156              }              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
157              break;              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
158            }
159          case WM_COMMAND:          center_window (dlg, NULL);
160              switch( HIWORD( wparam ) ) {          SetForegroundWindow (dlg);
161              case BN_CLICKED:          return FALSE;
162                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE  
163                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {          case WM_COMMAND:
164                      HWND hwnd;              switch (HIWORD (wparam)) {
165                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));              case BN_CLICKED:
166                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
167                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
168                      SetFocus (hwnd);                      HWND hwnd;
169                  }                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
170              }                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
171                        SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
172              switch (LOWORD (wparam)) {                      SetFocus (hwnd);
173              case IDOK:                    }
174                  /* fixme: the item is even cached when the passphrase is not              }
175                            correct, which means that the user needs to delete all  
176                            cached entries to continue. */              switch (LOWORD (wparam)) {
177                  if (c->pwd)              case IDOK:  
178                      burn_passphrase (&c->pwd);                  /* XXX: the item is even cached when the passphrase is not
179                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));                          correct, which means that the user needs to delete all
180                  if (!n) {                          cached entries to continue. */
181                      c->pwd = new char[2];                  if (c->pwd)
182                      if (!c->pwd)                      burn_passphrase (&c->pwd);
183                          BUG (NULL);                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
184                      strcpy (c->pwd, "");                  if (!n) {
185                  }                      c->pwd = new char[2];
186                  else {                      if (!c->pwd)
187                      c->pwd = new char[n+2];                          BUG (NULL);
188                      if (!c->pwd)                      strcpy (c->pwd, "");
189                          BUG (NULL);                  }
190                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);                  else {
191                  }                      char *p = new char[n+2];
192                  res = gpgme_op_decrypt_result (c->gpg);                      if (!p)
193                  if (!res)                          BUG (NULL);
194                      res_sig = gpgme_op_sign_result (c->gpg);                      /* Get the passphrase and convert it utf8.
195                  if (reg_prefs.cache_time > 0 && !c->is_card &&                         This does not just the us-ascii charset. */
196                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                      SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), p, n+1);
197                      if (agent_get_cache (c->keyid, &item))                      c->pwd = native_to_utf8 (p);
198                          agent_unlock_cache_entry (&item);                      sfree_if_alloc (p);
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 (!c->is_card && reg_prefs.cache_time > 0 &&
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 TRUE;
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 *p, *uid;
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_native (uid_hint);
279  }      if (strcmp (usedkey, mainkey))
280            _snprintf (desc, size-1,
281                       _("You need a passphrase to unlock the secret key for user:\n"
282  /*                       "\"%s\"\n"
283  static int inline                       "%s key, ID 0x%s (main key ID 0x%s)\n"),
284  is_hexstring (const char * p)                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
285  {      else if (!strcmp (usedkey, mainkey))
286      size_t i;          _snprintf (desc, size-1,
287                       _("You need a passphrase to unlock the secret key for user:\n"
288      for (i=0; i < strlen (p); i++) {                       "\"%s\"\n"
289          if (!isxdigit (p[i]))                       "%s key, ID 0x%s\n"),
290              return -1;                       uid, get_key_pubalgo (algo), usedkey+8);
291      }      safe_free (uid);
292      return 0;      return 0;
293  }  }
294  */  
295    
296  /* Passphrase callback with the ability to support caching. */  /* Extract the serial number from the card ID @id and return it. */
297  gpgme_error_t  const char*
298  passphrase_cb (void *hook, const char *uid_hint,  extract_serial_no (const char *id)
299                 const char *passphrase_info,  {
300                 int prev_was_bad, int fd)      static char buf[8];
301  {      char *p;
302      passphrase_cb_s *c = (passphrase_cb_s*)hook;  
303      HANDLE hd = (HANDLE)fd;      p = strchr (id, '/');
304      void *item;      if (!p) {
305      const char *keyid, *pass;          log_debug ("extract_serial_no: error '%s'\r\n", id);
306      DWORD n;          return "";
307      int rc;      }
308        memset (buf, 0, sizeof (buf));
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 no valid callback\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);              log_debug ("passphrase_cb: could not create dialog box\n");
397      cb->gpg_cmd = cmd;              return 0;
398      cb->bad_pwd = 0;          }
399      cb->is_card = 0;          c->pwd_init = 0;
400      cb->cancel = 0;      }
401      cb->hwnd = hwnd;      if (c->cancel || !c->pwd) {
402      cb->pwd_init = 1;          if (!WriteFile (hd, "\n", 1, &n, NULL))
403      free_if_alloc (cb->title);              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
404      cb->title = m_strdup (title);          return 0;
405      if (!cb->title)      }
406          BUG (NULL);  
407      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);      if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
408      cb->gpg = ctx;          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
409  }      if (!WriteFile (hd, "\n", 1, &n, NULL))
410            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
411        return 0;
412  /* Release a passphrase callback @ctx. */  }
413  void  
414  release_gpg_passphrase_cb (passphrase_cb_s *ctx)  
415  {  /* Initialize the given passphrase callback @cb with the
416      if (!ctx)     used gpgme context @ctx, the command @cmd and a title
417          return;     @title for the dialog. */
418      sfree_if_alloc (ctx->pwd);  void
419      free_if_alloc (ctx->title);  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
420  }                         int cmd, HWND hwnd, const char *title)
421    {
422        memset (cb, 0, sizeof *cb);
423  /* Simple check to measure passphrase (@pass) quality.      cb->gpg_cmd = cmd;
424     Return value: 0 on success. */      cb->bad_pwd = 0;
425  int      cb->is_card = 0;
426  check_passwd_quality (const char *pass, int strict)      cb->cancel = 0;
427  {      cb->hwnd = hwnd;
428      int i, nd=0, nc=0, n;      cb->pwd_init = 1;
429        free_if_alloc (cb->title);
430      n = strlen (pass);      cb->title = m_strdup (title);
431      if (n < 8)      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
432          return -1;      cb->gpg = ctx;
433    }
434      for (i=0; i < n; i++) {  
435          if (isdigit (pass[i])) nd++;  
436          if (isalpha (pass[i])) nc++;  /* Release the gpg recipient list. */
437      }  void
438    release_gpg_recipients (gpgme_recipient_t *recipients)
439      if (nd == n || nc == n)  {
440          return -1;      gpgme_recipient_t r, n;
441    
442      return 0;      r = *recipients;
443  }      while (r != NULL) {
444            n = r->next;
445            safe_free (r->keyid);
446            safe_free (r);
447            r = n;
448        }
449        *recipients = NULL;
450    }
451    
452    
453    
454    /* Release a passphrase callback @ctx. */
455    void
456    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
457    {
458        if (!ctx)
459            return;
460        sfree_if_alloc (ctx->pwd);
461        free_if_alloc (ctx->title);
462        release_gpg_recipients (&ctx->recipients);
463    }
464    
465    
466    /* _Simple_ check to measure passphrase (@pass) quality.
467       Return value: 0 on success. */
468    int
469    check_passwd_quality (const char *pass, int strict)
470    {
471        int i, nd=0, nc=0, n;
472    
473        /* A good passphrase should be at least 8 characters. */
474        n = strlen (pass);
475        if (n < 8)
476            return -1;
477    
478        for (i=0; i < n; i++) {
479            if (isdigit (pass[i]))
480                nd++;
481            if (isalpha (pass[i]))
482                nc++;
483        }
484    
485        /* Check that the passphrase contains letters and numbers. */
486        if (nd == n || nc == n)
487            return -1;
488    
489        return 0;
490    }
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