/[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 85 by twoaday, Fri Nov 18 07:20:40 2005 UTC
# Line 1  Line 1 
1  /* wptPassphraseCB.cpp - GPGME Passphrase Callback  /* wptPassphraseCB.cpp - GPGME Passphrase Callback
2   *      Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz   *      Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz
3   *      Copyright (C) 2005 g10 Code GmbH   *      Copyright (C) 2005 g10 Code GmbH
4   *   *
5   * This file is part of WinPT.   * This file is part of WinPT.
6   *   *
7   * WinPT is free software; you can redistribute it and/or   * WinPT is free software; you can redistribute it and/or
8   * modify it under the terms of the GNU General Public License   * modify it under the terms of the GNU General Public License
9   * as published by the Free Software Foundation; either version 2   * as published by the Free Software Foundation; either version 2
10   * of the License, or (at your option) any later version.   * of the License, or (at your option) any later version.
11   *     *  
12   * WinPT is distributed in the hope that it will be useful,   * WinPT is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * General Public License for more details.   * General Public License for more details.
16   *   *
17   * You should have received a copy of the GNU General Public License   * You should have received a copy of the GNU General Public License
18   * along with WinPT; if not, write to the Free Software Foundation,   * along with WinPT; if not, write to the Free Software Foundation,
19   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20   */   */
21    
22  #include <windows.h>  #ifdef HAVE_CONFIG_H
23  #include <ctype.h>  #include <config.h>
24    #endif
25  #include "../resource.h"  
26  #include "wptNLS.h"  #include <windows.h>
27  #include "wptW32API.h"  #include <ctype.h>
28  #include "wptVersion.h"  
29  #include "wptGPG.h"  #include "resource.h"
30  #include "wptCommonCtl.h"  #include "wptNLS.h"
31  #include "wptContext.h"  #include "wptW32API.h"
32  #include "wptDlgs.h"  #include "wptVersion.h"
33  #include "wptUTF8.h"  #include "wptGPG.h"
34  #include "wptErrors.h"  #include "wptCommonCtl.h"
35  #include "wptTypes.h"  #include "wptContext.h"
36  #include "wptKeyList.h"  #include "wptDlgs.h"
37  #include "wptAgent.h"  #include "wptUTF8.h"
38  #include "wptRegistry.h"  #include "wptErrors.h"
39    #include "wptTypes.h"
40  const char* get_symkey_algo (int algo);  #include "wptKeylist.h"
41    #include "wptAgent.h"
42  #define item_ctrl_id( cmd ) \  #include "wptRegistry.h"
43      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)  
44    const char* get_symkey_algo (int algo);
45  #define item_ctrl_id2(cmd) \  
46      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)  #define item_ctrl_id( cmd ) \
47        ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
48    
49  /* Overwrite passphrase and free memory. */  #define item_ctrl_id2(cmd) \
50  static void      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
51  burn_passphrase (char **pwd)  
52  {  
53      char *pass = *pwd;    /* Overwrite passphrase and free memory. */
54      memset (pass, 0, strlen (pass));  static void
55      delete []pass;  burn_passphrase (char **pwd)
56      *pwd = NULL;  {
57  }      char *pass = *pwd;
58        wipememory (pass, strlen (pass));
59        delete []pass;
60  /* Dialog procedure for the passphrase callback. */      *pwd = NULL;
61  static BOOL CALLBACK  }
62  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)  
63  {      
64      static passphrase_cb_s * c;  /* Dialog procedure for the passphrase callback. */
65      gpgme_decrypt_result_t res;  static BOOL CALLBACK
66      gpgme_sign_result_t res_sig;  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
67      gpgme_key_t key;  {    
68      void *ctx = NULL, *item;      static passphrase_cb_s *c;
69      const char *id;      gpgme_decrypt_result_t res=NULL;
70      char *info;      gpgme_sign_result_t res_sig=NULL;
71      int n;      gpgme_key_t key;
72        gpgme_recipient_t recip=NULL, r;
73      /* XXX: we need a timer to update the 'enc_to' entries. */      void *item;
74      switch (msg) {      const char *id;
75      case WM_INITDIALOG:      char *info;
76          c = (passphrase_cb_s *)lparam;      int n;
77          if (!c)  
78              BUG (0);      switch (msg) {
79          SetWindowText (dlg, c->title);      case WM_INITDIALOG:
80          if (c->gpg_cmd == GPG_CMD_DECRYPT) {          c = (passphrase_cb_s *)lparam;
81              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,          if (!c)
82                  _("Encrypted with the following public key(s)") );              BUG (0);
83              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );          SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
84          }          SetWindowText (dlg, c->title);
85          else if (c->gpg_cmd == GPG_CMD_SIGN)          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
86              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
87          res = gpgme_op_decrypt_result (c->gpg);                              _("Encrypted with the following public key(s)"));
88          if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
89              gpgme_recipient_t r;          }
90            else if (c->gpg_cmd == GPG_CMD_SIGN)
91              /* XXX: not all ENCRYPT_TO entries are listed here. */              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
92              for (r = res->recipients; r; r = r->next) {          if (c->recipients)
93                  get_pubkey (r->keyid, &key);              recip = c->recipients; /* recipients were already extracted. */
94                  if (key) {          else {
95                      char *uid;              /* XXX: not all ENCRYPT_TO entries are listed here. */
96                      id = key->uids->name;              res = gpgme_op_decrypt_result (c->gpg);
97                      if (!id)              if (res && res->recipients)
98                          id = _("Invalid User ID");                  recip = res->recipients;
99                      uid = utf8_to_wincp (id, strlen (id));          }
100                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
101                                       + strlen (key->uids->email)+1];              for (r = res->recipients; r; r = r->next) {
102                      if (!info)                  get_pubkey (r->keyid, &key);
103                          BUG (NULL);                  if (key) {
104                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,                      char *uid;
105                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                      id = key->uids->name;
106                      free (uid);                      if (!id)
107                                                id = _("Invalid User ID");
108                  }                      uid = utf8_to_wincp (id, strlen (id));
109                  else {                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1
110                      info = new char [32 + strlen (r->keyid)+1 + 4];                                       + strlen (key->uids->email)+1];
111                      if (!info)                      if (!info)
112                          BUG (NULL);                          BUG (NULL);
113                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,
114                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
115                  }                      free (uid);
116                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);                      
117                  free_if_alloc (info);                  }
118              }                  else {
119          }                      info = new char [32 + strlen (r->keyid)+1 + 4];
120          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                      if (!info)
121              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);                          BUG (NULL);
122          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
123                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
124                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :                  }
125                          _("Please enter your passphrase"));                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
126          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                  free_if_alloc (info);
127              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));              }
128              if (res && !res->recipients) {          }
129                  const char *s = _("Symmetric encryption.\n"          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
130                                    "%s encrypted data.");              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
131                  const char *alg = get_symkey_algo (c->sym.sym_algo);          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
132                  info = new char[strlen (s) + strlen (alg) + 2];                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
133                  if (!info)                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
134                      BUG (NULL);                          _("Please enter your passphrase"));
135                  sprintf (info, s, alg);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
136                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
137                  free_if_alloc (info);              if (res && !res->recipients) {
138              }                  const char *s = _("Symmetric encryption.\n"
139              else                                    "%s encrypted data.");
140                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                  const char *alg = get_symkey_algo (c->sym.sym_algo);
141          }                  info = new char[strlen (s) + strlen (alg) + 2];
142          else {                  if (!info)
143              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));                      BUG (NULL);
144              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);                  sprintf (info, s, alg);
145          }                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
146          center_window (dlg, NULL);                  free_if_alloc (info);
147          SetForegroundWindow (dlg);              }
148          set_active_window (dlg);              else
149          return FALSE;                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
150            }
151          case WM_SYSCOMMAND:          else {
152              if (LOWORD (wparam) == SC_CLOSE) {              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
153                  SetDlgItemText (dlg, item_ctrl_id( c->gpg_cmd ), "");              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
154                  c->cancel = 1;          }
155                  EndDialog (dlg, TRUE);          center_window (dlg, NULL);
156              }          SetForegroundWindow (dlg);
157              break;          set_active_window (dlg);
158            return FALSE;
159          case WM_COMMAND:  
160              switch( HIWORD( wparam ) ) {          case WM_SYSCOMMAND:
161              case BN_CLICKED:              if (LOWORD (wparam) == SC_CLOSE) {
162                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
163                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                  c->cancel = 1;
164                      HWND hwnd;                  EndDialog (dlg, TRUE);
165                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));              }
166                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));              break;
167                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);  
168                      SetFocus (hwnd);          case WM_COMMAND:
169                  }              switch (HIWORD (wparam)) {
170              }              case BN_CLICKED:
171                    if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
172              switch (LOWORD (wparam)) {                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
173              case IDOK:                        HWND hwnd;
174                  /* fixme: the item is even cached when the passphrase is not                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
175                            correct, which means that the user needs to delete all                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
176                            cached entries to continue. */                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
177                  if (c->pwd)                      SetFocus (hwnd);
178                      burn_passphrase (&c->pwd);                  }
179                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));              }
180                  if (!n) {  
181                      c->pwd = new char[2];              switch (LOWORD (wparam)) {
182                      if (!c->pwd)              case IDOK:  
183                          BUG (NULL);                  /* XXX: the item is even cached when the passphrase is not
184                      strcpy (c->pwd, "");                          correct, which means that the user needs to delete all
185                  }                          cached entries to continue. */
186                  else {                  if (c->pwd)
187                      c->pwd = new char[n+2];                      burn_passphrase (&c->pwd);
188                      if (!c->pwd)                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
189                          BUG (NULL);                  if (!n) {
190                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);                      c->pwd = new char[2];
191                  }                      if (!c->pwd)
192                  res = gpgme_op_decrypt_result (c->gpg);                          BUG (NULL);
193                  if (!res)                      strcpy (c->pwd, "");
194                      res_sig = gpgme_op_sign_result (c->gpg);                  }
195                  if (reg_prefs.cache_time > 0 && !c->is_card &&                  else {
196                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                      c->pwd = new char[n+2];
197                      if (agent_get_cache (c->keyid, &item))                      if (!c->pwd)
198                          agent_unlock_cache_entry (&item);                          BUG (NULL);
199                      else                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
200                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                  }
201                  }                  res = gpgme_op_decrypt_result (c->gpg);
202                  EndDialog (dlg, TRUE);                  if (!res)
203                  return TRUE;                      res_sig = gpgme_op_sign_result (c->gpg);            
204                                    if (reg_prefs.cache_time > 0 && !c->is_card &&
205              case IDCANCEL:                      (res || res_sig)) {
206                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                      if (agent_get_cache (c->keyid, &item))                      
207                  c->cancel = 1;                          agent_unlock_cache_entry (&item);
208                  EndDialog (dlg, FALSE);                      else
209                  return FALSE;                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
210              }                  }
211              break;                  c->cancel = 0;
212      }                  EndDialog (dlg, TRUE);
213                        return TRUE;
214      return FALSE;                  
215  }              case IDCANCEL:
216                    SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
217                    c->cancel = 1;
218  /* Extract the main keyid from @pass_info.                  EndDialog (dlg, FALSE);
219     Return value: long main keyid or NULL for an error. */                  return FALSE;
220  static const char*              }
221  parse_gpg_keyid (const char *pass_info)              break;
222  {      }
223      static char keyid[16+1];      
224            return FALSE;
225      /* XXX: check for leading alpha-chars? */  }
226      if (strlen (pass_info) < 16)  
227          return NULL;  
228      /* the format of the desc buffer looks like this:  /* Extract the main keyid from @pass_info.
229         request_keyid[16] main_keyid[16] keytype[1] keylength[4]     Return value: long main keyid or NULL for an error. */
230         we use the main keyid to use only one cache entry. */  static const char*
231      strncpy (keyid, pass_info+17, 16);  parse_gpg_keyid (const char *pass_info)
232      keyid[16] = 0;  {
233      return keyid;      static char keyid[16+1];
234  }      
235        /* XXX: check for leading alpha-chars? */
236        if (strlen (pass_info) < 16) {
237  /* Parse the information in @uid_hint and @pass_info to generate          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
238     a input message for the user in @desc. */          return NULL;
239  static int      }
240  parse_gpg_description (const char *uid_hint, const char *pass_info,      /* the format of the desc buffer looks like this:
241                         char *desc, int size)         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
242  {         we use the main keyid to use only one cache entry. */
243      gpgme_pubkey_algo_t algo;      strncpy (keyid, pass_info+17, 16);
244      char usedkey[16+1], mainkey[16+1];      keyid[16] = 0;
245      char *uid, *p;      return keyid;
246      int n=0;  }
247    
248      if (strlen (uid_hint) < 17) {  
249          *desc = 0;  /* Parse the information in @uid_hint and @pass_info to generate
250          return -1;     a input message for the user in @desc. */
251      }  static int
252    parse_gpg_description (const char *uid_hint, const char *pass_info,
253      while (p = strsep ((char**)&pass_info, " ")) {                         char *desc, int size)
254          switch (n++) {  {
255          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;      gpgme_pubkey_algo_t algo;
256          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;      char usedkey[16+1];
257          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;      char mainkey[16+1];
258          }      char *uid, *p;
259      }      int n=0;
260      uid_hint += 16; /* skip keyid */  
261      uid_hint += 1;  /* space */      algo = (gpgme_pubkey_algo_t)0;
262        /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
263      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));      if (strlen (uid_hint) < 17) {
264            *desc = 0;
265      if (strcmp (usedkey, mainkey))          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
266          _snprintf (desc, size-1,          return -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"),      while (p = strsep ((char**)&pass_info, " ")) {
270                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);          switch (n++) {
271      else if (!strcmp (usedkey, mainkey))          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
272          _snprintf (desc, size-1,          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
273                     _("You need a passphrase to unlock the secret key for\n"          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
274                       "user: \"%s\"\n"          }
275                       "%s key, ID %s\n"),      }
276                       uid, get_key_pubalgo (algo), usedkey+8);      uid_hint += 16; /* skip keyid */
277      free (uid);      uid_hint += 1;  /* space */
278      return 0;  
279  }      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
280    
281        if (strcmp (usedkey, mainkey))
282  /*          _snprintf (desc, size-1,
283  static int inline                     _("You need a passphrase to unlock the secret key for\n"
284  is_hexstring (const char * p)                       "user: \"%s\"\n"
285  {                       "%s key, ID %s (main key ID %s)\n"),
286      size_t i;                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
287        else if (!strcmp (usedkey, mainkey))
288      for (i=0; i < strlen (p); i++) {          _snprintf (desc, size-1,
289          if (!isxdigit (p[i]))                     _("You need a passphrase to unlock the secret key for\n"
290              return -1;                       "user: \"%s\"\n"
291      }                       "%s key, ID %s\n"),
292      return 0;                       uid, get_key_pubalgo (algo), usedkey+8);
293  }      free (uid);
294  */      return 0;
295    }
296  /* Passphrase callback with the ability to support caching. */  
297  gpgme_error_t  
298  passphrase_cb (void *hook, const char *uid_hint,  /* Extract the serial number from the card ID @id and return it. */
299                 const char *passphrase_info,  const char*
300                 int prev_was_bad, int fd)  extract_serial_no (const char *id)
301  {  {
302      passphrase_cb_s *c = (passphrase_cb_s*)hook;      static char buf[8];
303      HANDLE hd = (HANDLE)fd;      char *p;
304      void *item;  
305      const char *keyid, *pass;      p = strchr (id, '/');
306      DWORD n;      if (!p) {
307      int rc;          log_debug ("extract_serial_no: error '%s'\r\n", id);
308            return NULL;
309      if (!c)      }
310          return gpg_error (GPG_ERR_INV_ARG);      strncpy (buf, id+(p-id)-6, 6);
311      c->bad_pwd = prev_was_bad? 1 : 0;      return buf;
312      if (prev_was_bad && !c->cancel) {  }
313          if (c->pwd)  
314              burn_passphrase (&c->pwd);  
315          agent_del_cache (c->keyid);  /* Passphrase callback with the ability to support caching. */
316          c->pwd_init = 1;  gpgme_error_t
317      }  passphrase_cb (void *hook, const char *uid_hint,
318                   const char *passphrase_info,
319      if (passphrase_info) {                 int prev_was_bad, int fd)
320          if (strlen (passphrase_info) < 16 &&  {
321              !strstr (passphrase_info, "OPENPGP")) {/* assume symetric encryption. */      passphrase_cb_s *c = (passphrase_cb_s*)hook;
322              int n=2;      HANDLE hd = (HANDLE)fd;
323              c->sym.sym_algo = atoi (passphrase_info);      void *item;
324              if (c->sym.sym_algo > 9)      const char *keyid=NULL, *pass;
325                  n++;      DWORD n;
326              /* XXX: be more strict. */      int rc = 0;
327              c->sym.s2k_mode = atoi (passphrase_info+n);  
328              c->sym.s2k_hash = atoi (passphrase_info+n+2);      if (!c) {
329          }          log_debug ("passphrase_cb: error '!c'\r\n");
330            return gpg_error (GPG_ERR_INV_ARG);
331          keyid = parse_gpg_keyid (passphrase_info);      }
332          pass = agent_get_cache (keyid+8, &item);      c->bad_pwd = prev_was_bad? 1 : 0;
333          if (pass) {      if (prev_was_bad && !c->cancel) {
334              agent_unlock_cache_entry (&item);          if (c->pwd)
335              c->pwd_init = 0;              burn_passphrase (&c->pwd);
336              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))          agent_del_cache (c->keyid);
337                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);          c->pwd_init = 1;
338              if (!WriteFile (hd, "\n", 1, &n, NULL))      }
339                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);  
340              return 0;      if (passphrase_info) {
341          }          if (strlen (passphrase_info) < 16 &&
342      }              !strstr (passphrase_info, "OPENPGP")) {
343                /* assume symetric encryption. */
344      if (c->pwd_init) {              int pos=2;
345          if (keyid && strlen (keyid) == 16)              c->sym.sym_algo = atoi (passphrase_info);
346              strcpy (c->keyid, keyid+8);              if (c->sym.sym_algo > 9)
347                    pos++;
348          /* if @passphrase_info contains 'OPENPGP' we assume a smart card              /* XXX: be more strict. */
349              has been used. */              c->sym.s2k_mode = atoi (passphrase_info+pos);
350          if (strstr (passphrase_info, "OPENPGP")) {              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
351              char buf[16];          }
352              memset (buf, 0, sizeof buf);  
353              strncpy (buf, "??", 2); /* XXX: fixme we need the serial no. */          keyid = parse_gpg_keyid (passphrase_info);
354              _snprintf (c->info, sizeof c->info-1,          pass = agent_get_cache (keyid+8, &item);        
355                         _("Please enter the PIN to unlock your secret card key\n"          if (pass) {
356                           "Card: %s"), buf);              agent_unlock_cache_entry (&item);
357              c->is_card = 1;              c->pwd_init = 0;
358          }              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
359          else if (uid_hint)                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
360              parse_gpg_description (uid_hint, passphrase_info,              if (!WriteFile (hd, "\n", 1, &n, NULL))
361                                     c->info, sizeof c->info - 1);                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
362          if (c->gpg_cmd == GPG_CMD_DECRYPT) {              return 0;
363              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,          }
364                                   (HWND)c->hwnd, passphrase_callback_proc,      }
365                                   (LPARAM)c);  
366          }      if (c->pwd_init) {
367          else if (c->gpg_cmd == GPG_CMD_SIGN) {          if (keyid && strlen (keyid) == 16)
368              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,              strcpy (c->keyid, keyid+8);
369                                   (HWND)c->hwnd, passphrase_callback_proc,  
370                                   (LPARAM)c);          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
371          }              has been used. */
372          if (rc == -1) {          if (strstr (passphrase_info, "OPENPGP")) {
373              WriteFile (hd, "\n", 1, &n, NULL);              const char *s=passphrase_info;
374              return 0;              while (s && *s && *s != 'D')
375          }                  s++;
376          c->pwd_init = 0;              _snprintf (c->info, sizeof c->info-1,
377      }                         _("Please enter the PIN to unlock your secret card key\n"
378      if (c->cancel) {                           "Card: %s"), extract_serial_no (s));
379          WriteFile (hd, "\n", 1, &n, NULL);              c->is_card = 1;
380          return 0;          }
381      }          else if (uid_hint)
382                parse_gpg_description (uid_hint, passphrase_info,
383      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);                                     c->info, sizeof c->info - 1);
384      WriteFile (hd, "\n", 1, &n, NULL);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
385      return 0;              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
386  }                                   (HWND)c->hwnd, passphrase_callback_proc,
387                                     (LPARAM)c);
388            }
389  /* Initialize the given passphrase callback @cb with the          else if (c->gpg_cmd == GPG_CMD_SIGN) {
390     used gpgme context @ctx, the command @cmd and a title              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
391     @title for the dialog. */                                   (HWND)c->hwnd, passphrase_callback_proc,
392  void                                   (LPARAM)c);
393  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,          }
394                         int cmd, HWND hwnd, const char *title)          if (rc == -1) {
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;          c->pwd_init = 0;
400      cb->cancel = 0;      }
401      cb->hwnd = hwnd;      if (c->cancel) {
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)      if (!cb->title)
432          return -1;          BUG (NULL);
433        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
434      for (i=0; i < n; i++) {      cb->gpg = ctx;
435          if (isdigit (pass[i])) nd++;  }
436          if (isalpha (pass[i])) nc++;  
437      }  
438    /* Release a passphrase callback @ctx. */
439      if (nd == n || nc == n)  void
440          return -1;  release_gpg_passphrase_cb (passphrase_cb_s *ctx)
441    {
442      return 0;      gpgme_recipient_t r, n;
443  }  
444        if (!ctx)
445            return;
446        sfree_if_alloc (ctx->pwd);
447        free_if_alloc (ctx->title);
448        r = ctx->recipients;
449        while (r) {
450            n = r->next;
451            safe_free (r->keyid);
452            safe_free (r);
453            r = n;
454        }
455    }
456    
457    
458    /* Simple check to measure passphrase (@pass) quality.
459       Return value: 0 on success. */
460    int
461    check_passwd_quality (const char *pass, int strict)
462    {
463        int i, nd=0, nc=0, n;
464    
465        n = strlen (pass);
466        if (n < 8)
467            return -1;
468    
469        for (i=0; i < n; i++) {
470            if (isdigit (pass[i]))
471                nd++;
472            if (isalpha (pass[i]))
473                nc++;
474        }
475    
476        /* check that the passphrase contains letters and numbers. */
477        if (nd == n || nc == n)
478            return -1;
479    
480        return 0;
481    }

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