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

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revision 33 by twoaday, Tue Oct 25 07:46:20 2005 UTC revision 271 by twoaday, Sun Nov 5 08:57:45 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, 2002-2006 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    
45  #define item_ctrl_id2(cmd) \  /* Return the control ID dependent on the mode (sign or decrypt). */
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  {  const char* get_symkey_algo (int algo);
53      char *pass = *pwd;  void ListBox_AddString_utf8 (HWND lb, const char *txt);
54      wipememory (pass, strlen (pass));  
55      delete []pass;  
56      *pwd = NULL;  /* Overwrite passphrase and free memory. */
57  }  static void
58    burn_passphrase (char **pwd)
59    {
60  /* Dialog procedure for the passphrase callback. */      char *pass = *pwd;
61  static BOOL CALLBACK  
62  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)      wipememory (pass, strlen (pass));
63  {          delete []pass;
64      static passphrase_cb_s * c;      *pwd = NULL;
65      gpgme_decrypt_result_t res;  }
66      gpgme_sign_result_t res_sig;  
67      gpgme_key_t key;  
68      gpgme_recipient_t recip, r;  /* Dialog procedure for the passphrase callback. */
69      void *ctx = NULL, *item;  static BOOL CALLBACK
70      const char *id;  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
71      char *info;  {    
72      int n;      static passphrase_cb_s *c;
73        gpgme_decrypt_result_t res=NULL;
74      switch (msg) {      gpgme_sign_result_t res_sig=NULL;
75      case WM_INITDIALOG:      gpgme_recipient_t recip=NULL, r;
76          c = (passphrase_cb_s *)lparam;      winpt_key_s key;
77          if (!c)      void *item;
78              BUG (0);      const char *id;
79          SetWindowText (dlg, c->title);      char *info;
80          if (c->gpg_cmd == GPG_CMD_DECRYPT) {      int n;
81              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,  
82                              _("Encrypted with the following public key(s)"));      switch (msg) {
83              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);      case WM_ACTIVATE:
84          }          safe_edit_control_init (dlg, item_ctrl_id (c->gpg_cmd));
85          else if (c->gpg_cmd == GPG_CMD_SIGN)          break;
86              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);  
87          if (c->recipients)      case WM_DESTROY:
88              recip = c->recipients; /* recipients were already extracted. */          safe_edit_control_free (dlg, item_ctrl_id (c->gpg_cmd));
89          else {          break;
90              /* XXX: not all ENCRYPT_TO entries are listed here. */  
91              res = gpgme_op_decrypt_result (c->gpg);      case WM_INITDIALOG:
92              if (res->recipients)          c = (passphrase_cb_s *)lparam;
93                  recip = res->recipients;          if (!c)
94          }              BUG (0);
95          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
96              for (r = res->recipients; r; r = r->next) {          SetWindowText (dlg, c->title);
97                  get_pubkey (r->keyid, &key);          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
98                  if (key) {              SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
99                      char *uid;              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
100                      id = key->uids->name;                              _("Encrypted with the following public key(s)"));
101                      if (!id)              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
102                          id = _("Invalid User ID");          }
103                      uid = utf8_to_wincp (id, strlen (id));          else if (c->gpg_cmd == GPG_CMD_SIGN) {
104                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
105                                       + strlen (key->uids->email)+1];              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
106                      if (!info)          }
107                          BUG (NULL);          /* Because it depends on the order the keys are stored in the
108                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,             keyring whether res->recipients is complete or not, we also
109                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);             support that the recipients were externally extracted and then
110                      free (uid);             we use this list. */
111                                if (c->recipients)
112                  }              recip = c->recipients; /* recipients were already extracted. */
113                  else {          else {
114                      info = new char [32 + strlen (r->keyid)+1 + 4];              res = gpgme_op_decrypt_result (c->gpg);
115                      if (!info)              if (res && res->recipients)
116                          BUG (NULL);                  recip = res->recipients;
117                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),          }
118                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
119                  }              for (r = recip; r; r = r->next) {
120                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);                  memset (&key, 0, sizeof (key));
121                  free_if_alloc (info);                  if (!winpt_get_pubkey (r->keyid, &key)) {
122              }                      gpgme_user_id_t u = key.ctx->uids;
123          }  
124          else if (c->gpg_cmd == GPG_CMD_DECRYPT)                      id = u->name;
125              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);                      if (!id)
126          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?                          id = _("Invalid User ID");
127                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,                      n = 32+strlen (id)+1+4+strlen (r->keyid)+1;
128                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :                      if (u->email)
129                          _("Please enter your passphrase"));                          n += strlen (u->email)+1;
130          if (c->gpg_cmd == GPG_CMD_DECRYPT) {                      info = new char [n+1];
131              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));                      if (!info)
132              if (res && !res->recipients) {                          BUG (NULL);
133                  const char *s = _("Symmetric encryption.\n"                      if (!u->email || strlen (u->email) < 1)
134                                    "%s encrypted data.");                          sprintf (info, "%s (%s, 0x%s)", id,
135                  const char *alg = get_symkey_algo (c->sym.sym_algo);                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
136                  info = new char[strlen (s) + strlen (alg) + 2];                      else
137                  if (!info)                          sprintf (info, "%s <%s> (%s, 0x%s)", id, u->email,
138                      BUG (NULL);                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
139                  sprintf (info, s, alg);                  }
140                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);                  else {
141                  free_if_alloc (info);                      info = new char [32 + strlen (r->keyid)+1 + 4];
142              }                      if (!info)
143              else                          BUG (NULL);
144                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
145          }                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
146          else {                  }
147              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));                  ListBox_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
148              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);                  free_if_alloc (info);
149          }                  winpt_release_pubkey (&key);
150          center_window (dlg, NULL);              }
151          SetForegroundWindow (dlg);          }
152          set_active_window (dlg);          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
153          return FALSE;              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
154            SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
155          case WM_SYSCOMMAND:                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
156              if (LOWORD (wparam) == SC_CLOSE) {                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
157                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");                          _("Please enter your passphrase"));
158                  c->cancel = 1;          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
159                  EndDialog (dlg, TRUE);              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
160              }              if (res && !res->recipients) {
161              break;                  const char *s = _("Symmetric encryption.\n"
162                                      "%s encrypted data.");
163          case WM_COMMAND:                  const char *alg = get_symkey_algo (c->sym.sym_algo);
164              switch (HIWORD (wparam)) {                  info = new char[strlen (s) + strlen (alg) + 2];
165              case BN_CLICKED:                  if (!info)
166                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE                      BUG (NULL);
167                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {                  sprintf (info, s, alg);
168                      HWND hwnd;                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
169                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));                  free_if_alloc (info);
170                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));              }
171                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);              else
172                      SetFocus (hwnd);                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
173                  }          }
174              }          else {
175                SetFocus (GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
176              switch (LOWORD (wparam)) {              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
177              case IDOK:            }
178                  /* XXX: the item is even cached when the passphrase is not          center_window (dlg, NULL);
179                          correct, which means that the user needs to delete all          SetForegroundWindow (dlg);
180                          cached entries to continue. */          return FALSE;
181                  if (c->pwd)  
182                      burn_passphrase (&c->pwd);          case WM_COMMAND:
183                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));              switch (HIWORD (wparam)) {
184                  if (!n) {              case BN_CLICKED:
185                      c->pwd = new char[2];                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
186                      if (!c->pwd)                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
187                          BUG (NULL);                      HWND hwnd;
188                      strcpy (c->pwd, "");                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
189                  }                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
190                  else {                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
191                      c->pwd = new char[n+2];                      SetFocus (hwnd);
192                      if (!c->pwd)                  }
193                          BUG (NULL);              }
194                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);  
195                  }              switch (LOWORD (wparam)) {
196                  res = gpgme_op_decrypt_result (c->gpg);              case IDOK:  
197                  if (!res)                  /* XXX: the item is even cached when the passphrase is not
198                      res_sig = gpgme_op_sign_result (c->gpg);                          correct, which means that the user needs to delete all
199                  if (reg_prefs.cache_time > 0 && !c->is_card &&                          cached entries to continue. */
200                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                  if (c->pwd)
201                      if (agent_get_cache (c->keyid, &item))                      burn_passphrase (&c->pwd);
202                          agent_unlock_cache_entry (&item);                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
203                      else                  if (!n) {
204                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                      c->pwd = new char[2];
205                  }                      if (!c->pwd)
206                  c->cancel = 0;                          BUG (NULL);
207                  EndDialog (dlg, TRUE);                      strcpy (c->pwd, "");
208                  return TRUE;                  }
209                                    else {
210              case IDCANCEL:                      char *p = new char[n+2];
211                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");                      if (!p)
212                  c->cancel = 1;                          BUG (NULL);
213                  EndDialog (dlg, FALSE);                      /* Get the passphrase and convert it utf8.
214                  return FALSE;                         This does not just the us-ascii charset. */
215              }                      SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), p, n+1);
216              break;                      c->pwd = native_to_utf8 (p);
217      }                      sfree_if_alloc (p);
218                        }
219      return FALSE;                  res = gpgme_op_decrypt_result (c->gpg);
220  }                  if (!res)
221                        res_sig = gpgme_op_sign_result (c->gpg);
222                    if (!c->is_card && reg_prefs.cache_time > 0 &&
223  /* Extract the main keyid from @pass_info.                      (res || res_sig)) {
224     Return value: long main keyid or NULL for an error. */                      if (agent_get_cache (c->keyid, &item))
225  static const char*                          agent_unlock_cache_entry (&item);
226  parse_gpg_keyid (const char *pass_info)                      else
227  {                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
228      static char keyid[16+1];                  }
229                        c->cancel = 0;
230      /* XXX: check for leading alpha-chars? */                  EndDialog (dlg, TRUE);
231      if (strlen (pass_info) < 16)                  return TRUE;
232          return NULL;                  
233      /* the format of the desc buffer looks like this:              case IDCANCEL:
234         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
235         we use the main keyid to use only one cache entry. */                  c->cancel = 1;
236      strncpy (keyid, pass_info+17, 16);                  EndDialog (dlg, FALSE);
237      keyid[16] = 0;                  return TRUE;
238      return keyid;              }
239  }              break;
240        }
241        
242  /* Parse the information in @uid_hint and @pass_info to generate      return FALSE;
243     a input message for the user in @desc. */  }
244  static int  
245  parse_gpg_description (const char *uid_hint, const char *pass_info,  
246                         char *desc, int size)  /* Extract the main keyid from @pass_info.
247  {     Return value: long main keyid or NULL for an error. */
248      gpgme_pubkey_algo_t algo;  static const char*
249      char usedkey[16+1];  parse_gpg_keyid (const char *pass_info)
250      char mainkey[16+1];  {
251      char *uid, *p;      static char keyid[16+1];
252      int n=0;      
253        /* XXX: check for leading alpha-chars? */
254      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */      if (strlen (pass_info) < 16) {
255      if (strlen (uid_hint) < 17) {          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
256          *desc = 0;          return NULL;
257          return -1;      }
258      }      /* the format of the desc buffer looks like this:
259           request_keyid[16] main_keyid[16] keytype[1] keylength[4]
260      while (p = strsep ((char**)&pass_info, " ")) {         we use the main keyid to use only one cache entry. */
261          switch (n++) {      strncpy (keyid, pass_info+17, 16);
262          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;      keyid[16] = 0;
263          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;      return keyid;
264          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;  }
265          }  
266      }  
267      uid_hint += 16; /* skip keyid */  /* Parse the information in @uid_hint and @pass_info to generate
268      uid_hint += 1;  /* space */     a input message for the user in @desc. */
269    static int
270      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));  parse_gpg_description (const char *uid_hint, const char *pass_info,
271                           char *desc, int size)
272      if (strcmp (usedkey, mainkey))  {
273          _snprintf (desc, size-1,      gpgme_pubkey_algo_t algo;
274                     _("You need a passphrase to unlock the secret key for\n"      char usedkey[16+1];
275                       "user: \"%s\"\n"      char mainkey[16+1];
276                       "%s key, ID %s (main key ID %s)\n"),      char *p, *uid;
277                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);      int n=0;
278      else if (!strcmp (usedkey, mainkey))  
279          _snprintf (desc, size-1,      algo = (gpgme_pubkey_algo_t)0;
280                     _("You need a passphrase to unlock the secret key for\n"      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
281                       "user: \"%s\"\n"      if (strlen (uid_hint) < 17) {
282                       "%s key, ID %s\n"),          *desc = 0;
283                       uid, get_key_pubalgo (algo), usedkey+8);          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
284      free (uid);          return -1;
285      return 0;      }
286  }  
287        while (p = strsep ((char**)&pass_info, " ")) {
288            switch (n++) {
289  /* Extract the serial number from the card ID @id and return it. */          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
290  const char*          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
291  extract_serial_no (const char *id)          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
292  {          }
293      static char buf[8];      }
294      char *p;      uid_hint += 16; /* skip keyid */
295        uid_hint += 1;  /* space */
296      p = strchr (id, '/');  
297      if (!p)      uid = utf8_to_native (uid_hint);
298          return NULL;      if (strcmp (usedkey, mainkey))
299      strncpy (buf, id+(p-id)-6, 6);          _snprintf (desc, size-1,
300      return buf;                     _("You need a passphrase to unlock the secret key for user:\n"
301  }                       "\"%s\"\n"
302                         "%s key, ID 0x%s (main key ID 0x%s)\n"),
303                       uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
304  /* Passphrase callback with the ability to support caching. */      else if (!strcmp (usedkey, mainkey))
305  gpgme_error_t          _snprintf (desc, size-1,
306  passphrase_cb (void *hook, const char *uid_hint,                     _("You need a passphrase to unlock the secret key for user:\n"
307                 const char *passphrase_info,                       "\"%s\"\n"
308                 int prev_was_bad, int fd)                       "%s key, ID 0x%s\n"),
309  {                       uid, get_key_pubalgo (algo), usedkey+8);
310      passphrase_cb_s *c = (passphrase_cb_s*)hook;      safe_free (uid);
311      HANDLE hd = (HANDLE)fd;      return 0;
312      void *item;  }
313      const char *keyid, *pass;  
314      DWORD n;  
315      int rc;  /* Extract the serial number from the card ID @id and return it. */
316    const char*
317      if (!c)  extract_serial_no (const char *id)
318          return gpg_error (GPG_ERR_INV_ARG);  {
319      c->bad_pwd = prev_was_bad? 1 : 0;      static char buf[8];
320      if (prev_was_bad && !c->cancel) {      char *p;
321          if (c->pwd)  
322              burn_passphrase (&c->pwd);      p = strchr (id, '/');
323          agent_del_cache (c->keyid);      if (!p) {
324          c->pwd_init = 1;          log_debug ("extract_serial_no: error '%s'\r\n", id);
325      }          return "";
326        }
327      if (passphrase_info) {      memset (buf, 0, sizeof (buf));
328          if (strlen (passphrase_info) < 16 &&      strncpy (buf, id+(p-id)-6, 6);
329              !strstr (passphrase_info, "OPENPGP")) {      return buf;
330              /* assume symetric encryption. */  }
331              int n=2;  
332              c->sym.sym_algo = atoi (passphrase_info);  
333              if (c->sym.sym_algo > 9)  /* Passphrase callback with the ability to support caching. */
334                  n++;  gpgme_error_t
335              /* XXX: be more strict. */  passphrase_cb (void *hook, const char *uid_hint,
336              c->sym.s2k_mode = atoi (passphrase_info+n);                 const char *passphrase_info,
337              c->sym.s2k_hash = atoi (passphrase_info+n+2);                 int prev_was_bad, int fd)
338          }  {
339        passphrase_cb_s *c = (passphrase_cb_s*)hook;
340          keyid = parse_gpg_keyid (passphrase_info);      HANDLE hd = (HANDLE)fd;
341          pass = agent_get_cache (keyid+8, &item);      void *item;
342          if (pass) {      const char *keyid=NULL, *pass;
343              agent_unlock_cache_entry (&item);      DWORD n;
344              c->pwd_init = 0;      int rc = 0;
345              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))  
346                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);      if (!c) {
347              if (!WriteFile (hd, "\n", 1, &n, NULL))          log_debug ("passphrase_cb: error no valid callback\r\n");
348                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);          return gpg_error (GPG_ERR_INV_ARG);
349              return 0;      }
350          }      c->bad_pwd = prev_was_bad? 1 : 0;
351      }      if (prev_was_bad && !c->cancel) {
352            if (c->pwd)
353      if (c->pwd_init) {              burn_passphrase (&c->pwd);
354          if (keyid && strlen (keyid) == 16)          agent_del_cache (c->keyid);
355              strcpy (c->keyid, keyid+8);          c->pwd_init = 1;
356        }
357          /* if @passphrase_info contains 'OPENPGP' we assume a smart card  
358              has been used. */      if (passphrase_info) {
359          if (strstr (passphrase_info, "OPENPGP")) {          if (strlen (passphrase_info) < 16 &&
360              const char *s=passphrase_info;              !strstr (passphrase_info, "OPENPGP")) {
361              while (s && *s && *s != 'D')              /* assume symetric encryption. */
362                  s++;              int pos=2;
363              _snprintf (c->info, sizeof c->info-1,              c->sym.sym_algo = atoi (passphrase_info);
364                         _("Please enter the PIN to unlock your secret card key\n"              if (c->sym.sym_algo > 9)
365                           "Card: %s"), extract_serial_no (s));                  pos++;
366              c->is_card = 1;              /* XXX: be more strict. */
367          }              c->sym.s2k_mode = atoi (passphrase_info+pos);
368          else if (uid_hint)              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
369              parse_gpg_description (uid_hint, passphrase_info,          }
370                                     c->info, sizeof c->info - 1);  
371          if (c->gpg_cmd == GPG_CMD_DECRYPT) {          keyid = parse_gpg_keyid (passphrase_info);
372              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,          pass = agent_get_cache (keyid+8, &item);        
373                                   (HWND)c->hwnd, passphrase_callback_proc,          if (pass) {
374                                   (LPARAM)c);              agent_unlock_cache_entry (&item);
375          }              c->pwd_init = 0;
376          else if (c->gpg_cmd == GPG_CMD_SIGN) {              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
377              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
378                                   (HWND)c->hwnd, passphrase_callback_proc,              if (!WriteFile (hd, "\n", 1, &n, NULL))
379                                   (LPARAM)c);                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
380          }              return 0;
381          if (rc == -1) {          }
382              if (!WriteFile (hd, "\n", 1, &n, NULL))      }
383                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);  
384              return 0;      if (c->pwd_init) {
385          }          if (keyid && strlen (keyid) == 16)
386          c->pwd_init = 0;              strcpy (c->keyid, keyid+8);
387      }  
388      if (c->cancel) {          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
389          if (!WriteFile (hd, "\n", 1, &n, NULL))              has been used. */
390              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);          if (strstr (passphrase_info, "OPENPGP")) {
391          return 0;              const char *s=passphrase_info;
392      }              while (s && *s && *s != 'D')
393                    s++;
394      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);              _snprintf (c->info, sizeof c->info-1,
395      WriteFile (hd, "\n", 1, &n, NULL);                         _("Please enter the PIN to unlock your secret card key\n"
396      return 0;                           "Card: %s"), extract_serial_no (s));
397  }              c->is_card = 1;
398            }
399            else if (uid_hint)
400  /* Initialize the given passphrase callback @cb with the              parse_gpg_description (uid_hint, passphrase_info,
401     used gpgme context @ctx, the command @cmd and a title                                     c->info, sizeof (c->info) - 1);
402     @title for the dialog. */          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
403  void              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
404  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,                                   (HWND)c->hwnd, passphrase_callback_proc,
405                         int cmd, HWND hwnd, const char *title)                                   (LPARAM)c);
406  {          }
407      memset (cb, 0, sizeof *cb);          else if (c->gpg_cmd == GPG_CMD_SIGN) {
408      cb->gpg_cmd = cmd;              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
409      cb->bad_pwd = 0;                                   (HWND)c->hwnd, passphrase_callback_proc,
410      cb->is_card = 0;                                   (LPARAM)c);
411      cb->cancel = 0;          }
412      cb->hwnd = hwnd;          if (rc == -1) {
413      cb->pwd_init = 1;              if (!WriteFile (hd, "\n", 1, &n, NULL))
414      free_if_alloc (cb->title);                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
415      cb->title = m_strdup (title);              log_debug ("passphrase_cb: could not create dialog box\n");
416      if (!cb->title)              return 0;
417          BUG (NULL);          }
418      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);          c->pwd_init = 0;
419      cb->gpg = ctx;      }
420  }      if (c->cancel || !c->pwd) {
421            if (!WriteFile (hd, "\n", 1, &n, NULL))
422                log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
423  /* Release a passphrase callback @ctx. */          return 0;
424  void      }
425  release_gpg_passphrase_cb (passphrase_cb_s *ctx)  
426  {      if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
427      gpgme_recipient_t r, n;          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
428        if (!WriteFile (hd, "\n", 1, &n, NULL))
429      if (!ctx)          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
430          return;      return 0;
431      sfree_if_alloc (ctx->pwd);  }
432      free_if_alloc (ctx->title);  
433      r = ctx->recipients;  
434      while (r) {  /* Initialize the given passphrase callback @cb with the
435          n = r->next;     used gpgme context @ctx, the command @cmd and a title
436          safe_free (r->keyid);     @title for the dialog. */
437          safe_free (r);  void
438          r = n;  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
439      }                         int cmd, HWND hwnd, const char *title)
440  }  {
441        memset (cb, 0, sizeof *cb);
442        cb->gpg_cmd = cmd;
443  /* Simple check to measure passphrase (@pass) quality.      cb->bad_pwd = 0;
444     Return value: 0 on success. */      cb->is_card = 0;
445  int      cb->cancel = 0;
446  check_passwd_quality (const char *pass, int strict)      cb->hwnd = hwnd;
447  {      cb->pwd_init = 1;
448      int i, nd=0, nc=0, n;      free_if_alloc (cb->title);
449        cb->title = m_strdup (title);
450      n = strlen (pass);      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
451      if (n < 8)      cb->gpg = ctx;
452          return -1;  }
453    
454      for (i=0; i < n; i++) {  
455          if (isdigit (pass[i]))  /* Release the gpg recipient list. */
456              nd++;  void
457          if (isalpha (pass[i]))  release_gpg_recipients (gpgme_recipient_t *recipients)
458              nc++;  {
459      }      gpgme_recipient_t r, n;
460    
461      /* check that the passphrase contains letters and numbers. */      r = *recipients;
462      if (nd == n || nc == n)      while (r != NULL) {
463          return -1;          n = r->next;
464            safe_free (r->keyid);
465      return 0;          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        /* A good passphrase should be at least 8 characters. */
493        n = strlen (pass);
494        if (n < 8)
495            return -1;
496    
497        for (i=0; i < n; i++) {
498            if (isdigit (pass[i]))
499                nd++;
500            if (isalpha (pass[i]))
501                nc++;
502        }
503    
504        /* Check that the passphrase contains letters and numbers. */
505        if (nd == n || nc == n)
506            return -1;
507    
508        return 0;
509    }
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  Added in v.271
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