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

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revision 32 by twoaday, Mon Oct 24 08:03:48 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      wipememory (pass, 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      switch (msg) {      gpgme_key_t key;
74      case WM_INITDIALOG:      gpgme_recipient_t recip=NULL, r;
75          c = (passphrase_cb_s *)lparam;      void *item;
76          if (!c)      const char *id;
77              BUG (0);      char *info;
78          SetWindowText (dlg, c->title);      int n;
79          if (c->gpg_cmd == GPG_CMD_DECRYPT) {  
80              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,      switch (msg) {
81                              _("Encrypted with the following public key(s)"));      case WM_ACTIVATE:
82              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);          safe_edit_control_init (dlg, item_ctrl_id (c->gpg_cmd));
83          }          break;
84          else if (c->gpg_cmd == GPG_CMD_SIGN)  
85              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);      case WM_DESTROY:
86          res = gpgme_op_decrypt_result (c->gpg);          safe_edit_control_free (dlg, item_ctrl_id (c->gpg_cmd));
87          if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {          break;
88              gpgme_recipient_t r;  
89        case WM_INITDIALOG:
90              /* XXX: not all ENCRYPT_TO entries are listed here. */          c = (passphrase_cb_s *)lparam;
91              for (r = res->recipients; r; r = r->next) {          if (!c)
92                  get_pubkey (r->keyid, &key);              BUG (0);
93                  if (key) {          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
94                      char *uid;          SetWindowText (dlg, c->title);
95                      id = key->uids->name;          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
96                      if (!id)              SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
97                          id = _("Invalid User ID");              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
98                      uid = utf8_to_wincp (id, strlen (id));                              _("Encrypted with the following public key(s)"));
99                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
100                                       + strlen (key->uids->email)+1];          }
101                      if (!info)          else if (c->gpg_cmd == GPG_CMD_SIGN) {
102                          BUG (NULL);              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
103                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
104                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);          }
105                      free (uid);          /* Because it depends on the order the keys are stored in the
106                                   keyring whether res->recipients is complete or not, we also
107                  }             support that the recipients were externally extracted and then
108                  else {             we use this list. */
109                      info = new char [32 + strlen (r->keyid)+1 + 4];          if (c->recipients)
110                      if (!info)              recip = c->recipients; /* recipients were already extracted. */
111                          BUG (NULL);          else {
112                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),              res = gpgme_op_decrypt_result (c->gpg);
113                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);              if (res && res->recipients)
114                  }                  recip = res->recipients;
115                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);          }
116                  free_if_alloc (info);          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
117              }              for (r = recip; r; r = r->next) {
118          }                  get_pubkey (r->keyid, &key);
119          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                  if (key) {
120              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);                      gpgme_user_id_t u = key->uids;
121          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?  
122                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                      id = u->name;
123                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :                      if (!id)
124                          _("Please enter your passphrase"));                          id = _("Invalid User ID");
125          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                      n = 32+strlen (id)+1+4+strlen (r->keyid)+1;
126              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));                      if (u->email)
127              if (res && !res->recipients) {                          n += strlen (u->email)+1;
128                  const char *s = _("Symmetric encryption.\n"                      info = new char [n+1];
129                                    "%s encrypted data.");                      if (!info)
130                  const char *alg = get_symkey_algo (c->sym.sym_algo);                          BUG (NULL);
131                  info = new char[strlen (s) + strlen (alg) + 2];                      if (!u->email || strlen (u->email) < 1)
132                  if (!info)                          sprintf (info, "%s (%s, 0x%s)", id,
133                      BUG (NULL);                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
134                  sprintf (info, s, alg);                      else
135                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);                          sprintf (info, "%s <%s> (%s, 0x%s)", id, u->email,
136                  free_if_alloc (info);                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
137              }                  }
138              else                  else {
139                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                      info = new char [32 + strlen (r->keyid)+1 + 4];
140          }                      if (!info)
141          else {                          BUG (NULL);
142              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
143              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
144          }                  }
145          center_window (dlg, NULL);                  ListBox_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
146          SetForegroundWindow (dlg);                  free_if_alloc (info);
147          set_active_window (dlg);              }
148          return FALSE;          }
149            else if (c->gpg_cmd == GPG_CMD_DECRYPT)
150          case WM_SYSCOMMAND:              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
151              if (LOWORD (wparam) == SC_CLOSE) {          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
152                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
153                  c->cancel = 1;                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
154                  EndDialog (dlg, TRUE);                          _("Please enter your passphrase"));
155              }          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
156              break;              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
157                if (res && !res->recipients) {
158          case WM_COMMAND:                  const char *s = _("Symmetric encryption.\n"
159              switch (HIWORD (wparam)) {                                    "%s encrypted data.");
160              case BN_CLICKED:                  const char *alg = get_symkey_algo (c->sym.sym_algo);
161                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE                  info = new char[strlen (s) + strlen (alg) + 2];
162                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {                  if (!info)
163                      HWND hwnd;                      BUG (NULL);
164                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));                  sprintf (info, s, alg);
165                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
166                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);                  free_if_alloc (info);
167                      SetFocus (hwnd);              }
168                  }              else
169              }                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
170            }
171              switch (LOWORD (wparam)) {          else {
172              case IDOK:                SetFocus (GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
173                  /* XXX: the item is even cached when the passphrase is not              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
174                          correct, which means that the user needs to delete all          }
175                          cached entries to continue. */          center_window (dlg, NULL);
176                  if (c->pwd)          SetForegroundWindow (dlg);
177                      burn_passphrase (&c->pwd);          return FALSE;
178                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));  
179                  if (!n) {          case WM_SYSCOMMAND:
180                      c->pwd = new char[2];              if (LOWORD (wparam) == SC_CLOSE) {
181                      if (!c->pwd)                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
182                          BUG (NULL);                  c->cancel = 1;
183                      strcpy (c->pwd, "");                  EndDialog (dlg, TRUE);
184                  }              }
185                  else {              break;
186                      c->pwd = new char[n+2];  
187                      if (!c->pwd)          case WM_COMMAND:
188                          BUG (NULL);              switch (HIWORD (wparam)) {
189                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);              case BN_CLICKED:
190                  }                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
191                  res = gpgme_op_decrypt_result (c->gpg);                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
192                  if (!res)                      HWND hwnd;
193                      res_sig = gpgme_op_sign_result (c->gpg);                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
194                  if (reg_prefs.cache_time > 0 && !c->is_card &&                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
195                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
196                      if (agent_get_cache (c->keyid, &item))                      SetFocus (hwnd);
197                          agent_unlock_cache_entry (&item);                  }
198                      else              }
199                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);  
200                  }              switch (LOWORD (wparam)) {
201                  c->cancel = 0;              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];      return FALSE;
245      char mainkey[16+1];  }
246      char *uid, *p;  
247      int n=0;  
248    /* Extract the main keyid from @pass_info.
249      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */     Return value: long main keyid or NULL for an error. */
250      if (strlen (uid_hint) < 17) {  static const char*
251          *desc = 0;  parse_gpg_keyid (const char *pass_info)
252          return -1;  {
253      }      static char keyid[16+1];
254        
255      while (p = strsep ((char**)&pass_info, " ")) {      /* XXX: check for leading alpha-chars? */
256          switch (n++) {      if (strlen (pass_info) < 16) {
257          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
258          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;          return NULL;
259          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;      }
260          }      /* the format of the desc buffer looks like this:
261      }         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
262      uid_hint += 16; /* skip keyid */         we use the main keyid to use only one cache entry. */
263      uid_hint += 1;  /* space */      strncpy (keyid, pass_info+17, 16);
264        keyid[16] = 0;
265      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));      return keyid;
266    }
267      if (strcmp (usedkey, mainkey))  
268          _snprintf (desc, size-1,  
269                     _("You need a passphrase to unlock the secret key for\n"  /* Parse the information in @uid_hint and @pass_info to generate
270                       "user: \"%s\"\n"     a input message for the user in @desc. */
271                       "%s key, ID %s (main key ID %s)\n"),  static int
272                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);  parse_gpg_description (const char *uid_hint, const char *pass_info,
273      else if (!strcmp (usedkey, mainkey))                         char *desc, int size)
274          _snprintf (desc, size-1,  {
275                     _("You need a passphrase to unlock the secret key for\n"      gpgme_pubkey_algo_t algo;
276                       "user: \"%s\"\n"      char usedkey[16+1];
277                       "%s key, ID %s\n"),      char mainkey[16+1];
278                       uid, get_key_pubalgo (algo), usedkey+8);      char *p, *uid;
279      free (uid);      int n=0;
280      return 0;  
281  }      algo = (gpgme_pubkey_algo_t)0;
282        /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
283        if (strlen (uid_hint) < 17) {
284  /* Extract the serial number from the card ID @id and return it. */          *desc = 0;
285  const char*          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
286  extract_serial_no (const char *id)          return -1;
287  {      }
288      static char buf[8];  
289      char *p;      while (p = strsep ((char**)&pass_info, " ")) {
290            switch (n++) {
291      p = strchr (id, '/');          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
292      if (!p)          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
293          return NULL;          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
294      strncpy (buf, id+(p-id)-6, 6);          }
295      return buf;      }
296  }      uid_hint += 16; /* skip keyid */
297        uid_hint += 1;  /* space */
298    
299  /* Passphrase callback with the ability to support caching. */      uid = utf8_to_native (uid_hint);
300  gpgme_error_t      if (strcmp (usedkey, mainkey))
301  passphrase_cb (void *hook, const char *uid_hint,          _snprintf (desc, size-1,
302                 const char *passphrase_info,                     _("You need a passphrase to unlock the secret key for\n"
303                 int prev_was_bad, int fd)                       "user: \"%s\"\n"
304  {                       "%s key, ID %s (main key ID %s)\n"),
305      passphrase_cb_s *c = (passphrase_cb_s*)hook;                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
306      HANDLE hd = (HANDLE)fd;      else if (!strcmp (usedkey, mainkey))
307      void *item;          _snprintf (desc, size-1,
308      const char *keyid, *pass;                     _("You need a passphrase to unlock the secret key for\n"
309      DWORD n;                       "user: \"%s\"\n"
310      int rc;                       "%s key, ID %s\n"),
311                         uid, get_key_pubalgo (algo), usedkey+8);
312      if (!c)      safe_free (uid);
313          return gpg_error (GPG_ERR_INV_ARG);      return 0;
314      c->bad_pwd = prev_was_bad? 1 : 0;  }
315      if (prev_was_bad && !c->cancel) {  
316          if (c->pwd)  
317              burn_passphrase (&c->pwd);  /* Extract the serial number from the card ID @id and return it. */
318          agent_del_cache (c->keyid);  const char*
319          c->pwd_init = 1;  extract_serial_no (const char *id)
320      }  {
321        static char buf[8];
322      if (passphrase_info) {      char *p;
323          if (strlen (passphrase_info) < 16 &&  
324              !strstr (passphrase_info, "OPENPGP")) {      p = strchr (id, '/');
325              /* assume symetric encryption. */      if (!p) {
326              int n=2;          log_debug ("extract_serial_no: error '%s'\r\n", id);
327              c->sym.sym_algo = atoi (passphrase_info);          return NULL;
328              if (c->sym.sym_algo > 9)      }
329                  n++;      strncpy (buf, id+(p-id)-6, 6);
330              /* XXX: be more strict. */      return buf;
331              c->sym.s2k_mode = atoi (passphrase_info+n);  }
332              c->sym.s2k_hash = atoi (passphrase_info+n+2);  
333          }  
334    /* Passphrase callback with the ability to support caching. */
335          keyid = parse_gpg_keyid (passphrase_info);  gpgme_error_t
336          pass = agent_get_cache (keyid+8, &item);  passphrase_cb (void *hook, const char *uid_hint,
337          if (pass) {                 const char *passphrase_info,
338              agent_unlock_cache_entry (&item);                 int prev_was_bad, int fd)
339              c->pwd_init = 0;  {
340              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))      passphrase_cb_s *c = (passphrase_cb_s*)hook;
341                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);      HANDLE hd = (HANDLE)fd;
342              if (!WriteFile (hd, "\n", 1, &n, NULL))      void *item;
343                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);      const char *keyid=NULL, *pass;
344              return 0;      DWORD n;
345          }      int rc = 0;
346      }  
347        if (!c) {
348      if (c->pwd_init) {          log_debug ("passphrase_cb: error '!c'\r\n");
349          if (keyid && strlen (keyid) == 16)          return gpg_error (GPG_ERR_INV_ARG);
350              strcpy (c->keyid, keyid+8);      }
351        c->bad_pwd = prev_was_bad? 1 : 0;
352          /* if @passphrase_info contains 'OPENPGP' we assume a smart card      if (prev_was_bad && !c->cancel) {
353              has been used. */          if (c->pwd)
354          if (strstr (passphrase_info, "OPENPGP")) {              burn_passphrase (&c->pwd);
355              const char *s=passphrase_info;          agent_del_cache (c->keyid);
356              while (s && *s && *s != 'D')          c->pwd_init = 1;
357                  s++;      }
358              _snprintf (c->info, sizeof c->info-1,  
359                         _("Please enter the PIN to unlock your secret card key\n"      if (passphrase_info) {
360                           "Card: %s"), extract_serial_no (s));          if (strlen (passphrase_info) < 16 &&
361              c->is_card = 1;              !strstr (passphrase_info, "OPENPGP")) {
362          }              /* assume symetric encryption. */
363          else if (uid_hint)              int pos=2;
364              parse_gpg_description (uid_hint, passphrase_info,              c->sym.sym_algo = atoi (passphrase_info);
365                                     c->info, sizeof c->info - 1);              if (c->sym.sym_algo > 9)
366          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                  pos++;
367              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,              /* XXX: be more strict. */
368                                   (HWND)c->hwnd, passphrase_callback_proc,              c->sym.s2k_mode = atoi (passphrase_info+pos);
369                                   (LPARAM)c);              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
370          }          }
371          else if (c->gpg_cmd == GPG_CMD_SIGN) {  
372              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,          keyid = parse_gpg_keyid (passphrase_info);
373                                   (HWND)c->hwnd, passphrase_callback_proc,          pass = agent_get_cache (keyid+8, &item);        
374                                   (LPARAM)c);          if (pass) {
375          }              agent_unlock_cache_entry (&item);
376          if (rc == -1) {              c->pwd_init = 0;
377              if (!WriteFile (hd, "\n", 1, &n, NULL))              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
378                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
379              return 0;              if (!WriteFile (hd, "\n", 1, &n, NULL))
380          }                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
381          c->pwd_init = 0;              return 0;
382      }          }
383      if (c->cancel) {      }
384          if (!WriteFile (hd, "\n", 1, &n, NULL))  
385              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);      if (c->pwd_init) {
386          return 0;          if (keyid && strlen (keyid) == 16)
387      }              strcpy (c->keyid, keyid+8);
388    
389      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
390      WriteFile (hd, "\n", 1, &n, NULL);              has been used. */
391      return 0;          if (strstr (passphrase_info, "OPENPGP")) {
392  }              const char *s=passphrase_info;
393                while (s && *s && *s != 'D')
394                    s++;
395  /* Initialize the given passphrase callback @cb with the              _snprintf (c->info, sizeof c->info-1,
396     used gpgme context @ctx, the command @cmd and a title                         _("Please enter the PIN to unlock your secret card key\n"
397     @title for the dialog. */                           "Card: %s"), extract_serial_no (s));
398  void              c->is_card = 1;
399  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,          }
400                         int cmd, HWND hwnd, const char *title)          else if (uid_hint)
401  {              parse_gpg_description (uid_hint, passphrase_info,
402      memset (cb, 0, sizeof *cb);                                     c->info, sizeof (c->info) - 1);
403      cb->gpg_cmd = cmd;          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
404      cb->bad_pwd = 0;              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
405      cb->is_card = 0;                                   (HWND)c->hwnd, passphrase_callback_proc,
406      cb->cancel = 0;                                   (LPARAM)c);
407      cb->hwnd = hwnd;          }
408      cb->pwd_init = 1;          else if (c->gpg_cmd == GPG_CMD_SIGN) {
409      free_if_alloc (cb->title);              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
410      cb->title = m_strdup (title);                                   (HWND)c->hwnd, passphrase_callback_proc,
411      if (!cb->title)                                   (LPARAM)c);
412          BUG (NULL);          }
413      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);          if (rc == -1) {
414      cb->gpg = ctx;              if (!WriteFile (hd, "\n", 1, &n, NULL))
415  }                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
416                return 0;
417            }
418  /* Release a passphrase callback @ctx. */          c->pwd_init = 0;
419  void      }
420  release_gpg_passphrase_cb (passphrase_cb_s *ctx)      if (c->cancel || !c->pwd) {
421  {          if (!WriteFile (hd, "\n", 1, &n, NULL))
422      if (!ctx)              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
423          return;          return 0;
424      sfree_if_alloc (ctx->pwd);      }
425      free_if_alloc (ctx->title);  
426  }      if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
427            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
428        if (!WriteFile (hd, "\n", 1, &n, NULL))
429  /* Simple check to measure passphrase (@pass) quality.          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
430     Return value: 0 on success. */      return 0;
431  int  }
432  check_passwd_quality (const char *pass, int strict)  
433  {  
434      int i, nd=0, nc=0, n;  /* Initialize the given passphrase callback @cb with the
435       used gpgme context @ctx, the command @cmd and a title
436      n = strlen (pass);     @title for the dialog. */
437      if (n < 8)  void
438          return -1;  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
439                           int cmd, HWND hwnd, const char *title)
440      for (i=0; i < n; i++) {  {
441          if (isdigit (pass[i]))      memset (cb, 0, sizeof *cb);
442              nd++;      cb->gpg_cmd = cmd;
443          if (isalpha (pass[i]))      cb->bad_pwd = 0;
444              nc++;      cb->is_card = 0;
445      }      cb->cancel = 0;
446        cb->hwnd = hwnd;
447      /* check that the passphrase contains letters and numbers. */      cb->pwd_init = 1;
448      if (nd == n || nc == n)      free_if_alloc (cb->title);
449          return -1;      cb->title = m_strdup (title);
450        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
451      return 0;      cb->gpg = ctx;
452  }  }
453    
454    
455    /* Release the gpg recipient list. */
456    void
457    release_gpg_recipients (gpgme_recipient_t *recipients)
458    {
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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