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

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revision 25 by twoaday, Wed Oct 12 10:04:26 2005 UTC revision 229 by twoaday, Mon Jun 19 14:04:31 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  /* Dialog procedure for the passphrase callback. */  #define item_ctrl_id2(cmd) \
50  static BOOL CALLBACK      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
51  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)  
52  {      
53      static passphrase_cb_s * c;  void ListBox_AddString_utf8 (HWND lb, const char *txt);
54      gpgme_decrypt_result_t res;  
55      gpgme_sign_result_t res_sig;  /* Overwrite passphrase and free memory. */
56      gpgme_key_t key;  static void
57      void *ctx = NULL, *item;  burn_passphrase (char **pwd)
58      const char *id;  {
59      char *info;      char *pass = *pwd;
60      int n;      wipememory (pass, strlen (pass));
61        delete []pass;
62      switch (msg) {      *pwd = NULL;
63      case WM_INITDIALOG:  }
64          c = (passphrase_cb_s *)lparam;  
65          if (!c)  
66              BUG (0);  /* Dialog procedure for the passphrase callback. */
67          SetWindowText (dlg, c->title);  static BOOL CALLBACK
68          if (c->gpg_cmd == GPG_CMD_DECRYPT) {  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
69              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,  {    
70                  _("Encrypted with the following public key(s)") );      static passphrase_cb_s *c;
71              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );      gpgme_decrypt_result_t res=NULL;
72          }      gpgme_sign_result_t res_sig=NULL;
73          else if (c->gpg_cmd == GPG_CMD_SIGN)      gpgme_recipient_t recip=NULL, r;
74              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);      winpt_key_s key;
75          res = gpgme_op_decrypt_result (c->gpg);      void *item;
76          if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {      const char *id;
77              gpgme_recipient_t r;      char *info;
78        int n;
79              /* XXX: not all ENCRYPT_TO entries are listed here. */  
80              for (r = res->recipients; r; r = r->next) {      switch (msg) {
81                  get_pubkey (r->keyid, &key);      case WM_ACTIVATE:
82                  if (key) {          safe_edit_control_init (dlg, item_ctrl_id (c->gpg_cmd));
83                      char *uid;          break;
84                      id = key->uids->name;  
85                      if (!id)      case WM_DESTROY:
86                          id = _("Invalid User ID");          safe_edit_control_free (dlg, item_ctrl_id (c->gpg_cmd));
87                      uid = utf8_to_wincp (id, strlen (id));          break;
88                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1  
89                                       + strlen (key->uids->email)+1];      case WM_INITDIALOG:
90                      if (!info)          c = (passphrase_cb_s *)lparam;
91                          BUG (NULL);          if (!c)
92                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,              BUG (0);
93                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
94                      free (uid);          SetWindowText (dlg, c->title);
95                                if (c->gpg_cmd == GPG_CMD_DECRYPT) {
96                  }              SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
97                  else {              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
98                      info = new char [32 + strlen (r->keyid)+1 + 4];                              _("Encrypted with the following public key(s)"));
99                      if (!info)              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
100                          BUG (NULL);          }
101                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),          else if (c->gpg_cmd == GPG_CMD_SIGN) {
102                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
103                  }              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
104                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);          }
105                  free_if_alloc (info);          /* 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 if (c->gpg_cmd == GPG_CMD_DECRYPT)             we use this list. */
109              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);          if (c->recipients)
110          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?              recip = c->recipients; /* recipients were already extracted. */
111                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,          else {
112                          _("Please enter your passphrase"));              res = gpgme_op_decrypt_result (c->gpg);
113          if (c->gpg_cmd == GPG_CMD_DECRYPT) {              if (res && res->recipients)
114              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));                  recip = res->recipients;
115              if (res && !res->recipients) {          }
116                  const char *s = _("Symmetric encryption.\n"          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
117                                    "%s encrypted data.");              for (r = recip; r; r = r->next) {
118                  const char *alg = get_symkey_algo (c->sym.sym_algo);                  memset (&key, 0, sizeof (key));
119                  info = new char[strlen (s) + strlen (alg) + 2];                  if (!winpt_get_pubkey (r->keyid, &key)) {
120                  if (!info)                      gpgme_user_id_t u = key.ctx->uids;
121                      BUG (NULL);  
122                  sprintf (info, s, alg);                      id = u->name;
123                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);                      if (!id)
124                  free_if_alloc (info);                          id = _("Invalid User ID");
125              }                      n = 32+strlen (id)+1+4+strlen (r->keyid)+1;
126              else                      if (u->email)
127                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                          n += strlen (u->email)+1;
128          }                      info = new char [n+1];
129          else {                      if (!info)
130              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));                          BUG (NULL);
131              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);                      if (!u->email || strlen (u->email) < 1)
132          }                          sprintf (info, "%s (%s, 0x%s)", id,
133          center_window (dlg, NULL);                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
134          SetForegroundWindow (dlg);                      else
135          set_active_window (dlg);                          sprintf (info, "%s <%s> (%s, 0x%s)", id, u->email,
136          return FALSE;                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
137                    }
138          case WM_SYSCOMMAND:                  else {
139              if( LOWORD( wparam ) == SC_CLOSE ) {                      info = new char [32 + strlen (r->keyid)+1 + 4];
140                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );                      if (!info)
141                  c->cancel = 1;                          BUG (NULL);
142                  EndDialog( dlg, TRUE );                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
143              }                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
144              break;                  }
145                    ListBox_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
146          case WM_COMMAND:                  free_if_alloc (info);
147              switch( HIWORD( wparam ) ) {                  winpt_release_pubkey (&key);
148              case BN_CLICKED:              }
149                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE          }
150                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
151                      HWND hwnd;              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
152                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
153                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
154                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);                          c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
155                      SetFocus (hwnd);                          _("Please enter your passphrase"));
156                  }          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
157              }              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
158                if (res && !res->recipients) {
159              switch (LOWORD (wparam)) {                  const char *s = _("Symmetric encryption.\n"
160              case IDOK:                                      "%s encrypted data.");
161                  /* fixme: the item is even cached when the passphrase is not                  const char *alg = get_symkey_algo (c->sym.sym_algo);
162                            correct, which means that the user needs to delete all                  info = new char[strlen (s) + strlen (alg) + 2];
163                            cached entries to continue. */                  if (!info)
164                  if (c->pwd) {                      BUG (NULL);
165                      delete []c->pwd;                  sprintf (info, s, alg);
166                      c->pwd = NULL;                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
167                  }                  free_if_alloc (info);
168                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));              }
169                  if (!n) {              else
170                      c->pwd = new char[2];                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
171                      strcpy (c->pwd, "");          }
172                  }          else {
173                  else {              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
174                      c->pwd = new char[n+2];              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
175                      if (!c->pwd)          }
176                          BUG (NULL);          center_window (dlg, NULL);
177                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);          SetForegroundWindow (dlg);
178                  }          return FALSE;
179                  res = gpgme_op_decrypt_result (c->gpg);  
180                  if (!res)          case WM_SYSCOMMAND:
181                      res_sig = gpgme_op_sign_result (c->gpg);              if (LOWORD (wparam) == SC_CLOSE) {
182                  if (reg_prefs.cache_time > 0 && !c->is_card &&                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
183                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                  c->cancel = 1;
184                      if (agent_get_cache (c->keyid, &item))                  EndDialog (dlg, TRUE);
185                          agent_unlock_cache_entry (&item);              }
186                      else              break;
187                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);  
188                  }          case WM_COMMAND:
189                  EndDialog (dlg, TRUE);              switch (HIWORD (wparam)) {
190                  return TRUE;              case BN_CLICKED:
191                                    if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
192              case IDCANCEL:                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
193                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                      HWND hwnd;
194                  c->cancel = 1;                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
195                  EndDialog (dlg, FALSE);                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
196                  return FALSE;                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
197              }                      SetFocus (hwnd);
198              break;                  }
199      }              }
200        
201      return FALSE;              switch (LOWORD (wparam)) {
202  }              case IDOK:  
203                    /* XXX: the item is even cached when the passphrase is not
204                            correct, which means that the user needs to delete all
205  /* Extract the main keyid from @pass_info.                          cached entries to continue. */
206     Return value: long main keyid or NULL for an error. */                  if (c->pwd)
207  static const char*                      burn_passphrase (&c->pwd);
208  parse_gpg_keyid (const char *pass_info)                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
209  {                  if (!n) {
210      static char keyid[16+1];                      c->pwd = new char[2];
211                            if (!c->pwd)
212      if (strlen (pass_info) < 16)                          BUG (NULL);
213          return NULL;                      strcpy (c->pwd, "");
214      /* the format of the desc buffer looks like this:                  }
215         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                  else {
216         we use the main keyid to use only one cache entry. */                      char *p = new char[n+2];
217      strncpy (keyid, pass_info+17, 16);                      if (!p)
218      keyid[16] = 0;                          BUG (NULL);
219      return keyid;                      /* Get the passphrase and convert it utf8.
220  }                         This does not just the us-ascii charset. */
221                        SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), p, n+1);
222                        c->pwd = native_to_utf8 (p);
223  /* Parse the information in @uid_hint and @pass_info to generate                      sfree_if_alloc (p);
224     a input message for the user in @desc. */                  }
225  static void                  res = gpgme_op_decrypt_result (c->gpg);
226  parse_gpg_description (const char *uid_hint, const char *pass_info,                  if (!res)
227                         char *desc, int size)                      res_sig = gpgme_op_sign_result (c->gpg);            
228  {                  if (reg_prefs.cache_time > 0 && !c->is_card &&
229      gpgme_pubkey_algo_t algo;                      (res || res_sig)) {
230      char usedkey[16+1], mainkey[16+1];                      if (agent_get_cache (c->keyid, &item))                      
231      char *uid, *p;                          agent_unlock_cache_entry (&item);
232      int n=0;                      else
233                            agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
234      while (p = strsep ((char**)&pass_info, " ")) {                  }
235          switch (n++) {                  c->cancel = 0;
236          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;                  EndDialog (dlg, TRUE);
237          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;                  return TRUE;
238          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;                  
239          }              case IDCANCEL:
240      }                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
241      uid_hint += 16; /* skip keyid */                  c->cancel = 1;
242      uid_hint += 1;  /* space */                  EndDialog (dlg, FALSE);
243                    return FALSE;
244      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));              }
245                break;
246      if (strcmp (usedkey, mainkey))      }
247          _snprintf (desc, size-1,      
248                     _("You need a passphrase to unlock the secret key for\n"      return FALSE;
249                       "user: \"%s\"\n"  }
250                       "%s key, ID %s (main key ID %s)\n"),  
251                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);  
252      else if (!strcmp (usedkey, mainkey))  /* Extract the main keyid from @pass_info.
253          _snprintf (desc, size-1,     Return value: long main keyid or NULL for an error. */
254                     _("You need a passphrase to unlock the secret key for\n"  static const char*
255                       "user: \"%s\"\n"  parse_gpg_keyid (const char *pass_info)
256                       "%s key, ID %s\n"),  {
257                       uid, get_key_pubalgo (algo), usedkey+8);      static char keyid[16+1];
258      free (uid);      
259  }      /* XXX: check for leading alpha-chars? */
260        if (strlen (pass_info) < 16) {
261            log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
262  static int inline          return NULL;
263  is_hexstring (const char * p)      }
264  {      /* the format of the desc buffer looks like this:
265      size_t i;         request_keyid[16] main_keyid[16] keytype[1] keylength[4]
266           we use the main keyid to use only one cache entry. */
267      for (i=0; i < strlen (p); i++) {      strncpy (keyid, pass_info+17, 16);
268          if (!isxdigit (p[i]))      keyid[16] = 0;
269              return -1;      return keyid;
270      }  }
271      return 0;  
272  }  
273    /* Parse the information in @uid_hint and @pass_info to generate
274       a input message for the user in @desc. */
275  /* Passphrase callback with the ability to support caching. */  static int
276  gpgme_error_t  parse_gpg_description (const char *uid_hint, const char *pass_info,
277  passphrase_cb (void *hook, const char *uid_hint,                         char *desc, int size)
278                 const char *passphrase_info,  {
279                 int prev_was_bad, int fd)      gpgme_pubkey_algo_t algo;
280  {      char usedkey[16+1];
281      passphrase_cb_s *c = (passphrase_cb_s*)hook;      char mainkey[16+1];
282      HANDLE hd = (HANDLE)fd;      char *p, *uid;
283      void *item;      int n=0;
284      const char *keyid, *pass;  
285      DWORD n;      algo = (gpgme_pubkey_algo_t)0;
286      int rc;      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
287        if (strlen (uid_hint) < 17) {
288      /* XXX: pubkey_enc cancel does not quit gpg.exe */          *desc = 0;
289      /* XXX: handle prev_was_bad case. */          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
290      if (!c)          return -1;
291          return gpg_error (GPG_ERR_INV_ARG);      }
292    
293      if (passphrase_info) {      while (p = strsep ((char**)&pass_info, " ")) {
294          if (strlen (passphrase_info) < 16) {/* assume symetric encryption. */          switch (n++) {
295              int n=2;          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
296              c->sym.sym_algo = atoi (passphrase_info);          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
297              if (c->sym.sym_algo > 9)          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
298                  n++;          }
299              /* XXX: be more strict. */      }
300              c->sym.s2k_mode = atoi (passphrase_info+n);      uid_hint += 16; /* skip keyid */
301              c->sym.s2k_hash = atoi (passphrase_info+n+2);      uid_hint += 1;  /* space */
302          }  
303        uid = utf8_to_native (uid_hint);
304          keyid = parse_gpg_keyid (passphrase_info);      if (strcmp (usedkey, mainkey))
305          pass = agent_get_cache (keyid+8, &item);          _snprintf (desc, size-1,
306          if (pass) {                     _("You need a passphrase to unlock the secret key for\n"
307              agent_unlock_cache_entry (&item);                       "user: \"%s\"\n"
308              c->pwd_init = 0;                       "%s key, ID %s (main key ID %s)\n"),
309              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
310                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);      else if (!strcmp (usedkey, mainkey))
311              if (!WriteFile (hd, "\n", 1, &n, NULL))          _snprintf (desc, size-1,
312                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);                     _("You need a passphrase to unlock the secret key for\n"
313              return 0;                       "user: \"%s\"\n"
314          }                       "%s key, ID %s\n"),
315      }                       uid, get_key_pubalgo (algo), usedkey+8);
316        safe_free (uid);
317      if (c->pwd_init) {      return 0;
318          if (keyid && strlen (keyid) == 16)  }
319              strcpy (c->keyid, keyid+8);  
320    
321          /* if the desc has a length of 32 and only hex digits, we assume a  /* Extract the serial number from the card ID @id and return it. */
322             smart card has been used. */  const char*
323          if (uid_hint && strlen (uid_hint) == 32 && !is_hexstring (uid_hint)) {  extract_serial_no (const char *id)
324              char buf[16];  {
325              memset (buf, 0, sizeof buf);      static char buf[8];
326              strncpy (buf, uid_hint+20, 8);      char *p;
327              _snprintf (c->info, sizeof c->info-1,  
328                         _("Please enter the PIN to unlock your secret card key\n"      p = strchr (id, '/');
329                           "Card: %s"), buf);      if (!p) {
330              c->is_card = 1;          log_debug ("extract_serial_no: error '%s'\r\n", id);
331          }          return NULL;
332          else if (uid_hint)      }
333              parse_gpg_description (uid_hint, passphrase_info,      strncpy (buf, id+(p-id)-6, 6);
334                                     c->info, sizeof c->info - 1);      return buf;
335          if (c->gpg_cmd == GPG_CMD_DECRYPT) {  }
336              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,  
337                                   (HWND)c->hwnd, passphrase_callback_proc,  
338                                   (LPARAM)c);  /* Passphrase callback with the ability to support caching. */
339          }  gpgme_error_t
340          else if (c->gpg_cmd == GPG_CMD_SIGN) {  passphrase_cb (void *hook, const char *uid_hint,
341              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,                 const char *passphrase_info,
342                                   (HWND)c->hwnd, passphrase_callback_proc,                 int prev_was_bad, int fd)
343                                   (LPARAM)c);  {
344          }      passphrase_cb_s *c = (passphrase_cb_s*)hook;
345          if (rc == -1) {      HANDLE hd = (HANDLE)fd;
346              WriteFile (hd, "\n", 1, &n, NULL);      void *item;
347              return gpg_error (GPG_ERR_EOF);      const char *keyid=NULL, *pass;
348          }      DWORD n;
349          c->pwd_init = 0;      int rc = 0;
350      }  
351      if (c->cancel) {      if (!c) {
352          WriteFile (hd, "\n", 1, &n, NULL);          log_debug ("passphrase_cb: error '!c'\r\n");
353          return gpg_error (GPG_ERR_EOF);          return gpg_error (GPG_ERR_INV_ARG);
354      }      }
355        c->bad_pwd = prev_was_bad? 1 : 0;
356      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);      if (prev_was_bad && !c->cancel) {
357      WriteFile (hd, "\n", 1, &n, NULL);          if (c->pwd)
358      return 0;              burn_passphrase (&c->pwd);
359  }          agent_del_cache (c->keyid);
360            c->pwd_init = 1;
361        }
362  /* Initialize the given passphrase callback @cb with the  
363     used gpgme context @ctx, the command @cmd and a title      if (passphrase_info) {
364     @title for the dialog. */          if (strlen (passphrase_info) < 16 &&
365  void              !strstr (passphrase_info, "OPENPGP")) {
366  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,              /* assume symetric encryption. */
367                         int cmd, HWND hwnd, const char *title)              int pos=2;
368  {              c->sym.sym_algo = atoi (passphrase_info);
369      memset (cb, 0, sizeof *cb);              if (c->sym.sym_algo > 9)
370      cb->gpg_cmd = cmd;                  pos++;
371      cb->is_card = 0;              /* XXX: be more strict. */
372      cb->cancel = 0;              c->sym.s2k_mode = atoi (passphrase_info+pos);
373      cb->hwnd = hwnd;              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
374      cb->pwd_init = 1;          }
375      free_if_alloc (cb->title);  
376      cb->title = m_strdup (title);          keyid = parse_gpg_keyid (passphrase_info);
377      if (!cb->title)          pass = agent_get_cache (keyid+8, &item);        
378          BUG (NULL);          if (pass) {
379      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);              agent_unlock_cache_entry (&item);
380      cb->gpg = ctx;              c->pwd_init = 0;
381  }              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
382                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
383                if (!WriteFile (hd, "\n", 1, &n, NULL))
384  /* Release a passphrase callback @ctx. */                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
385  void              return 0;
386  release_gpg_passphrase_cb (passphrase_cb_s *ctx)          }
387  {      }
388      if (!ctx)  
389          return;      if (c->pwd_init) {
390      sfree_if_alloc (ctx->pwd);          if (keyid && strlen (keyid) == 16)
391      free_if_alloc (ctx->title);              strcpy (c->keyid, keyid+8);
392  }  
393            /* if @passphrase_info contains 'OPENPGP' we assume a smart card
394  /* Simple check to measure passphrase (@pass) quality.              has been used. */
395     Return value: 0 on success. */          if (strstr (passphrase_info, "OPENPGP")) {
396  int              const char *s=passphrase_info;
397  check_passwd_quality (const char *pass, int strict)              while (s && *s && *s != 'D')
398  {                  s++;
399      int i, nd=0, nc=0, n;              _snprintf (c->info, sizeof c->info-1,
400                           _("Please enter the PIN to unlock your secret card key\n"
401      n = strlen (pass);                           "Card: %s"), extract_serial_no (s));
402      if (n < 8)              c->is_card = 1;
403          return -1;          }
404            else if (uid_hint)
405      for (i=0; i < n; i++) {              parse_gpg_description (uid_hint, passphrase_info,
406          if (isdigit (pass[i])) nd++;                                     c->info, sizeof (c->info) - 1);
407          if (isalpha (pass[i])) nc++;          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
408      }              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
409                                     (HWND)c->hwnd, passphrase_callback_proc,
410      if (nd == n || nc == n)                                   (LPARAM)c);
411          return -1;          }
412            else if (c->gpg_cmd == GPG_CMD_SIGN) {
413      return 0;              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
414  }                                   (HWND)c->hwnd, passphrase_callback_proc,
415                                     (LPARAM)c);
416            }
417            if (rc == -1) {
418                if (!WriteFile (hd, "\n", 1, &n, NULL))
419                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
420                return 0;
421            }
422            c->pwd_init = 0;
423        }
424        if (c->cancel || !c->pwd) {
425            if (!WriteFile (hd, "\n", 1, &n, NULL))
426                log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
427            return 0;
428        }
429    
430        if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
431            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
432        if (!WriteFile (hd, "\n", 1, &n, NULL))
433            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
434        return 0;
435    }
436    
437    
438    /* Initialize the given passphrase callback @cb with the
439       used gpgme context @ctx, the command @cmd and a title
440       @title for the dialog. */
441    void
442    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
443                           int cmd, HWND hwnd, const char *title)
444    {
445        memset (cb, 0, sizeof *cb);
446        cb->gpg_cmd = cmd;
447        cb->bad_pwd = 0;
448        cb->is_card = 0;
449        cb->cancel = 0;
450        cb->hwnd = hwnd;
451        cb->pwd_init = 1;
452        free_if_alloc (cb->title);
453        cb->title = m_strdup (title);
454        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
455        cb->gpg = ctx;
456    }
457    
458    
459    /* Release the gpg recipient list. */
460    void
461    release_gpg_recipients (gpgme_recipient_t *recipients)
462    {
463        gpgme_recipient_t r, n;
464    
465        r = *recipients;
466        while (r != NULL) {
467            n = r->next;
468            safe_free (r->keyid);
469            safe_free (r);
470            r = n;
471        }
472        *recipients = NULL;
473    }
474    
475    
476    
477    /* Release a passphrase callback @ctx. */
478    void
479    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
480    {
481        if (!ctx)
482            return;
483        sfree_if_alloc (ctx->pwd);
484        free_if_alloc (ctx->title);
485        release_gpg_recipients (&ctx->recipients);
486    }
487    
488    
489    /* Simple check to measure passphrase (@pass) quality.
490       Return value: 0 on success. */
491    int
492    check_passwd_quality (const char *pass, int strict)
493    {
494        int i, nd=0, nc=0, n;
495    
496        n = strlen (pass);
497        if (n < 8)
498            return -1;
499    
500        for (i=0; i < n; i++) {
501            if (isdigit (pass[i]))
502                nd++;
503            if (isalpha (pass[i]))
504                nc++;
505        }
506    
507        /* check that the passphrase contains letters and numbers. */
508        if (nd == n || nc == n)
509            return -1;
510    
511        return 0;
512    }
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