/[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 304 by twoaday, Wed Mar 21 10:59:31 2007 UTC
# Line 1  Line 1 
1  /* wptPassphraseCB.cpp - GPGME Passphrase Callback  /* wptPassphraseCB.cpp - GPGME Passphrase Callback
2   *      Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz   *      Copyright (C) 2001, 2002-2006 Timo Schulz
3   *      Copyright (C) 2005 g10 Code GmbH   *      Copyright (C) 2005 g10 Code GmbH
4   *   *
5   * This file is part of WinPT.   * This file is part of WinPT.
6   *   *
7   * WinPT is free software; you can redistribute it and/or   * WinPT is free software; you can redistribute it and/or
8   * modify it under the terms of the GNU General Public License   * modify it under the terms of the GNU General Public License
9   * as published by the Free Software Foundation; either version 2   * as published by the Free Software Foundation; either version 2
10   * of the License, or (at your option) any later version.   * of the License, or (at your option) any later version.
11   *     *  
12   * WinPT is distributed in the hope that it will be useful,   * WinPT is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * General Public License for more details.   * General Public License for more details.
16   *   */
17   * You should have received a copy of the GNU General Public License  #ifdef HAVE_CONFIG_H
18   * along with WinPT; if not, write to the Free Software Foundation,  #include <config.h>
19   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA  #endif
20   */  
21    #include <windows.h>
22  #include <windows.h>  #include <ctype.h>
23  #include <ctype.h>  
24    #include "resource.h"
25  #include "../resource.h"  #include "wptNLS.h"
26  #include "wptNLS.h"  #include "wptW32API.h"
27  #include "wptW32API.h"  #include "wptVersion.h"
28  #include "wptVersion.h"  #include "wptGPG.h"
29  #include "wptGPG.h"  #include "wptCommonCtl.h"
30  #include "wptCommonCtl.h"  #include "wptContext.h"
31  #include "wptContext.h"  #include "wptDlgs.h"
32  #include "wptDlgs.h"  #include "wptErrors.h"
33  #include "wptUTF8.h"  #include "wptTypes.h"
34  #include "wptErrors.h"  #include "wptKeylist.h"
35  #include "wptTypes.h"  #include "wptAgent.h"
36  #include "wptKeyList.h"  #include "wptRegistry.h"
37  #include "wptAgent.h"  #include "wptUTF8.h"
38  #include "wptRegistry.h"  #include "StringBuffer.h"
39    
40  const char* get_symkey_algo (int algo);  
41    /* Return the control ID dependent on the mode (sign or decrypt). */
42  #define item_ctrl_id( cmd ) \  #define item_ctrl_id(cmd) \
43      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
44    
45  #define item_ctrl_id2(cmd) \  #define item_ctrl_id2(cmd) \
46      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
47    
48    const char* get_symkey_algo (int algo);
49  /* Dialog procedure for the passphrase callback. */  void ListBox_AddString_utf8 (HWND lb, const char *txt);
50  static BOOL CALLBACK  
51  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)  
52  {      /* Overwrite passphrase and free memory. */
53      static passphrase_cb_s * c;  static void
54      gpgme_decrypt_result_t res;  burn_passphrase (char **pwd)
55      gpgme_sign_result_t res_sig;  {
56      gpgme_key_t key;      char *pass = *pwd;
57      void *ctx = NULL, *item;  
58      const char *id;      wipememory (pass, strlen (pass));
59      char *info;      delete []pass;
60      int n;      *pwd = NULL;
61    }
62      switch (msg) {  
63      case WM_INITDIALOG:  
64          c = (passphrase_cb_s *)lparam;  /* Dialog procedure for the passphrase callback. */
65          if (!c)  static BOOL CALLBACK
66              BUG (0);  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
67          SetWindowText (dlg, c->title);  {    
68          if (c->gpg_cmd == GPG_CMD_DECRYPT) {      static passphrase_cb_s *c;
69              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,      gpgme_decrypt_result_t res=NULL;
70                  _("Encrypted with the following public key(s)") );      gpgme_sign_result_t res_sig=NULL;
71              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );      gpgme_recipient_t recip=NULL, r;
72          }      winpt_key_s key;
73          else if (c->gpg_cmd == GPG_CMD_SIGN)      void *item;
74              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);      int n;
75          res = gpgme_op_decrypt_result (c->gpg);  
76          if (res != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {      switch (msg) {
77              gpgme_recipient_t r;      case WM_ACTIVATE:
78            /* Some people complained that it is no longer possible to
79              /* XXX: not all ENCRYPT_TO entries are listed here. */             paste in the passphrase in this dialog. When this option
80              for (r = res->recipients; r; r = r->next) {             is enabled, the ordinary passphrase control will be used. */
81                  get_pubkey (r->keyid, &key);          if (!reg_prefs.no_safe_pwd_ctrl)
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");          if (!reg_prefs.no_safe_pwd_ctrl)
87                      uid = utf8_to_wincp (id, strlen (id));              safe_edit_control_free (dlg, item_ctrl_id (c->gpg_cmd));
88                      info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1          break;
89                                       + strlen (key->uids->email)+1];  
90                      if (!info)      case WM_INITDIALOG:
91                          BUG (NULL);          c = (passphrase_cb_s *)lparam;
92                      sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,          if (!c)
93                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);              BUG (0);
94                      free (uid);          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
95                                SetWindowText (dlg, c->title);
96                  }          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
97                  else {              SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
98                      info = new char [32 + strlen (r->keyid)+1 + 4];              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
99                      if (!info)                              _("Encrypted with the following public key(s)"));
100                          BUG (NULL);              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
101                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),          }
102                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);          else if (c->gpg_cmd == GPG_CMD_SIGN) {
103                  }              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
104                  listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
105                  free_if_alloc (info);          }
106              }          /* Because it depends on the order the keys are stored in the
107          }             keyring whether res->recipients is complete or not, we also
108          else if (c->gpg_cmd == GPG_CMD_DECRYPT)             support that the recipients were externally extracted and then
109              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);             we use this list. */
110          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?          if (c->recipients)
111                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,              recip = c->recipients; /* recipients were already extracted. */
112                          _("Please enter your passphrase"));          else {
113          if (c->gpg_cmd == GPG_CMD_DECRYPT) {              res = gpgme_op_decrypt_result (c->gpg);
114              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));              if (res && res->recipients)
115              if (res && !res->recipients) {                  recip = res->recipients;
116                  const char *s = _("Symmetric encryption.\n"          }
117                                    "%s encrypted data.");          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
118                  const char *alg = get_symkey_algo (c->sym.sym_algo);              StringBuffer inf;
119                  info = new char[strlen (s) + strlen (alg) + 2];  
120                  if (!info)              for (r = recip; r; r = r->next) {
121                      BUG (NULL);                  memset (&key, 0, sizeof (key));
122                  sprintf (info, s, alg);                  if (!winpt_get_pubkey (r->keyid, &key)) {
123                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);                      gpgme_user_id_t u = key.ctx->uids;
124                  free_if_alloc (info);                      
125              }                      inf = (u->name? u->name : _("Invalid User ID"));
126              else                      if (u->email != NULL && strlen (u->email) > 1)
127                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);                          inf = inf + " <" + u->email + ">";
128          }                      inf = inf + " (" + get_key_pubalgo (r->pubkey_algo);
129          else {                      inf = inf + ", 0x" + (r->keyid+8) + ")";
130              SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));                  }
131              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);                  else {
132          }                      inf = _("Unknown key ID");
133          center_window (dlg, NULL);                      inf = inf + " (" + get_key_pubalgo (r->pubkey_algo);
134          SetForegroundWindow (dlg);                      inf = inf + ", 0x" + (r->keyid+8) + ")";
135          set_active_window (dlg);                  }
136          return FALSE;                  ListBox_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST),
137                                            inf.getBuffer ());
138          case WM_SYSCOMMAND:                  winpt_release_pubkey (&key);
139              if( LOWORD( wparam ) == SC_CLOSE ) {              }
140                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );          }
141                  c->cancel = 1;          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
142                  EndDialog( dlg, TRUE );              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
143              }          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
144              break;                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
145                            c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
146          case WM_COMMAND:                          _("Please enter your passphrase"));
147              switch( HIWORD( wparam ) ) {          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
148              case BN_CLICKED:              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
149                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE              if (res && !res->recipients) {
150                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                  StringBuffer sinf;
151                      HWND hwnd;  
152                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));                  sinf = _("Symmetric encryption.");
153                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));                  sinf = sinf + "\n" + get_symkey_algo (c->sym.sym_algo);
154                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);                  sinf = sinf + " " + _("encrypted data.");
155                      SetFocus (hwnd);                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, sinf.getBuffer ());
156                  }              }
157              }              else
158                    SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
159              switch (LOWORD (wparam)) {          }
160              case IDOK:            else {
161                  /* fixme: the item is even cached when the passphrase is not              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
162                            correct, which means that the user needs to delete all              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
163                            cached entries to continue. */          }
164                  if (c->pwd) {          center_window (dlg, NULL);
165                      delete []c->pwd;          SetForegroundWindow (dlg);
166                      c->pwd = NULL;          return FALSE;
167                  }  
168                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));          case WM_COMMAND:
169                  if (!n) {              switch (HIWORD (wparam)) {
170                      c->pwd = new char[2];              case BN_CLICKED:
171                      strcpy (c->pwd, "");                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
172                  }                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
173                  else {                      HWND hwnd;
174                      c->pwd = new char[n+2];                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
175                      if (!c->pwd)                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
176                          BUG (NULL);                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
177                      GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);                      SetFocus (hwnd);
178                  }                  }
179                  res = gpgme_op_decrypt_result (c->gpg);              }
180                  if (!res)  
181                      res_sig = gpgme_op_sign_result (c->gpg);              switch (LOWORD (wparam)) {
182                  if (reg_prefs.cache_time > 0 && !c->is_card &&              case IDOK:  
183                      ((res && res->recipients) || (res_sig && res_sig->signatures))) {                  /* XXX: the item is even cached when the passphrase is not
184                      if (agent_get_cache (c->keyid, &item))                          correct, which means that the user needs to delete all
185                          agent_unlock_cache_entry (&item);                          cached entries to continue. */
186                      else                  if (c->pwd)
187                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                      burn_passphrase (&c->pwd);
188                  }                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
189                  EndDialog (dlg, TRUE);                  if (!n) {
190                  return TRUE;                      c->pwd = new char[2];
191                                        if (!c->pwd)
192              case IDCANCEL:                          BUG (NULL);
193                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                      strcpy (c->pwd, "");
194                  c->cancel = 1;                  }
195                  EndDialog (dlg, FALSE);                  else {
196                  return FALSE;                      char *p = new char[n+2];
197              }                      if (!p)
198              break;                          BUG (NULL);
199      }                      /* Get the passphrase and convert it utf8.
200                               This does not just the us-ascii charset. */
201      return FALSE;                      SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), p, n+1);
202  }                      c->pwd = native_to_utf8 (p);
203                        sfree_if_alloc (p);
204                    }
205  /* Extract the main keyid from @pass_info.                  res = gpgme_op_decrypt_result (c->gpg);
206     Return value: long main keyid or NULL for an error. */                  if (!res)
207  static const char*                      res_sig = gpgme_op_sign_result (c->gpg);
208  parse_gpg_keyid (const char *pass_info)                  if (!c->is_card && reg_prefs.cache_time > 0 &&
209  {                      (res || res_sig)) {
210      static char keyid[16+1];                      if (agent_get_cache (c->keyid, &item))
211                                agent_unlock_cache_entry (&item);
212      if (strlen (pass_info) < 16)                      else
213          return NULL;                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
214      /* the format of the desc buffer looks like this:                  }
215         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                  c->cancel = 0;
216         we use the main keyid to use only one cache entry. */                  EndDialog (dlg, TRUE);
217      strncpy (keyid, pass_info+17, 16);                  return TRUE;
218      keyid[16] = 0;                  
219      return keyid;              case IDCANCEL:
220  }                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
221                    c->cancel = 1;
222                    EndDialog (dlg, FALSE);
223  /* Parse the information in @uid_hint and @pass_info to generate                  return TRUE;
224     a input message for the user in @desc. */              }
225  static void              break;
226  parse_gpg_description (const char *uid_hint, const char *pass_info,      }
227                         char *desc, int size)      
228  {      return FALSE;
229      gpgme_pubkey_algo_t algo;  }
230      char usedkey[16+1], mainkey[16+1];  
231      char *uid, *p;  
232      int n=0;  /* Extract the main keyid from @pass_info.
233       Return value: long main keyid or NULL for an error. */
234      while (p = strsep ((char**)&pass_info, " ")) {  static const char*
235          switch (n++) {  parse_gpg_keyid (const char *pass_info)
236          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;  {
237          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;      static char keyid[16+1];
238          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;      
239          }      /* XXX: check for leading alpha-chars? */
240      }      if (strlen (pass_info) < 16) {
241      uid_hint += 16; /* skip keyid */          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
242      uid_hint += 1;  /* space */          return NULL;
243        }
244      uid = utf8_to_wincp (uid_hint, strlen (uid_hint));      /* the format of the desc buffer looks like this:
245           request_keyid[16] main_keyid[16] keytype[1] keylength[4]
246      if (strcmp (usedkey, mainkey))         we use the main keyid to use only one cache entry. */
247          _snprintf (desc, size-1,      strncpy (keyid, pass_info+17, 16);
248                     _("You need a passphrase to unlock the secret key for\n"      keyid[16] = 0;
249                       "user: \"%s\"\n"      return keyid;
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))  
253          _snprintf (desc, size-1,  /* Parse the information in @uid_hint and @pass_info to generate
254                     _("You need a passphrase to unlock the secret key for\n"     a input message for the user in @desc. */
255                       "user: \"%s\"\n"  static int
256                       "%s key, ID %s\n"),  parse_gpg_description (const char *uid_hint, const char *pass_info,
257                       uid, get_key_pubalgo (algo), usedkey+8);                         char *desc, int size)
258      free (uid);  {
259  }      gpgme_pubkey_algo_t algo;
260        char usedkey[16+1];
261        char mainkey[16+1];
262  static int inline      char *p, *uid;
263  is_hexstring (const char * p)      int n=0;
264  {  
265      size_t i;      algo = (gpgme_pubkey_algo_t)0;
266        /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
267      for (i=0; i < strlen (p); i++) {      if (strlen (uid_hint) < 17) {
268          if (!isxdigit (p[i]))          *desc = 0;
269              return -1;          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
270      }          return -1;
271      return 0;      }
272  }  
273        while (p = strsep ((char**)&pass_info, " ")) {
274            switch (n++) {
275  /* Passphrase callback with the ability to support caching. */          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
276  gpgme_error_t          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
277  passphrase_cb (void *hook, const char *uid_hint,          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
278                 const char *passphrase_info,          }
279                 int prev_was_bad, int fd)      }
280  {      uid_hint += 16; /* skip keyid */
281      passphrase_cb_s *c = (passphrase_cb_s*)hook;      uid_hint += 1;  /* space */
282      HANDLE hd = (HANDLE)fd;  
283      void *item;      uid = utf8_to_native (uid_hint);
284      const char *keyid, *pass;      if (strcmp (usedkey, mainkey))
285      DWORD n;          _snprintf (desc, size-1,
286      int rc;                     _("You need a passphrase to unlock the secret key for user:\n"
287                         "\"%s\"\n"
288      /* XXX: pubkey_enc cancel does not quit gpg.exe */                       "%s key, ID 0x%s (main key ID 0x%s)\n"),
289      /* XXX: handle prev_was_bad case. */                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
290      if (!c)      else if (!strcmp (usedkey, mainkey))
291          return gpg_error (GPG_ERR_INV_ARG);          _snprintf (desc, size-1,
292                       _("You need a passphrase to unlock the secret key for user:\n"
293      if (passphrase_info) {                       "\"%s\"\n"
294          if (strlen (passphrase_info) < 16) {/* assume symetric encryption. */                       "%s key, ID 0x%s\n"),
295              int n=2;                       uid, get_key_pubalgo (algo), usedkey+8);
296              c->sym.sym_algo = atoi (passphrase_info);      safe_free (uid);
297              if (c->sym.sym_algo > 9)      return 0;
298                  n++;  }
299              /* XXX: be more strict. */  
300              c->sym.s2k_mode = atoi (passphrase_info+n);  
301              c->sym.s2k_hash = atoi (passphrase_info+n+2);  /* Extract the serial number from the card ID @id and return it. */
302          }  const char*
303    extract_serial_no (const char *id)
304          keyid = parse_gpg_keyid (passphrase_info);  {
305          pass = agent_get_cache (keyid+8, &item);      static char buf[8];
306          if (pass) {      char *p;
307              agent_unlock_cache_entry (&item);  
308              c->pwd_init = 0;      p = strchr (id, '/');
309              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))      if (!p) {
310                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);          log_debug ("extract_serial_no: error '%s'\r\n", id);
311              if (!WriteFile (hd, "\n", 1, &n, NULL))          return "";
312                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);      }
313              return 0;      memset (buf, 0, sizeof (buf));
314          }      strncpy (buf, id+(p-id)-6, 6);
315      }      return buf;
316    }
317      if (c->pwd_init) {  
318          if (keyid && strlen (keyid) == 16)  
319              strcpy (c->keyid, keyid+8);  /* Passphrase callback with the ability to support caching. */
320    gpgme_error_t
321          /* if the desc has a length of 32 and only hex digits, we assume a  passphrase_cb (void *hook, const char *uid_hint,
322             smart card has been used. */                 const char *passphrase_info,
323          if (uid_hint && strlen (uid_hint) == 32 && !is_hexstring (uid_hint)) {                 int prev_was_bad, int fd)
324              char buf[16];  {
325              memset (buf, 0, sizeof buf);      passphrase_cb_s *c = (passphrase_cb_s*)hook;
326              strncpy (buf, uid_hint+20, 8);      HANDLE hd = (HANDLE)fd;
327              _snprintf (c->info, sizeof c->info-1,      void *item;
328                         _("Please enter the PIN to unlock your secret card key\n"      const char *keyid=NULL, *pass;
329                           "Card: %s"), buf);      DWORD n;
330              c->is_card = 1;      int rc = 0;
331          }  
332          else if (uid_hint)      if (!c) {
333              parse_gpg_description (uid_hint, passphrase_info,          log_debug ("passphrase_cb: error no valid callback\r\n");
334                                     c->info, sizeof c->info - 1);          return gpg_error (GPG_ERR_INV_ARG);
335          if (c->gpg_cmd == GPG_CMD_DECRYPT) {      }
336              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,      c->bad_pwd = prev_was_bad? 1 : 0;
337                                   (HWND)c->hwnd, passphrase_callback_proc,      if (prev_was_bad && !c->cancel) {
338                                   (LPARAM)c);          if (c->pwd)
339          }              burn_passphrase (&c->pwd);
340          else if (c->gpg_cmd == GPG_CMD_SIGN) {          agent_del_cache (c->keyid);
341              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,          c->pwd_init = 1;
342                                   (HWND)c->hwnd, passphrase_callback_proc,      }
343                                   (LPARAM)c);  
344          }      if (passphrase_info) {
345          if (rc == -1) {          if (strlen (passphrase_info) < 16 &&
346              WriteFile (hd, "\n", 1, &n, NULL);              !strstr (passphrase_info, "OPENPGP")) {
347              return gpg_error (GPG_ERR_EOF);              /* assume symetric encryption. */
348          }              int pos=2;
349          c->pwd_init = 0;              c->sym.sym_algo = atoi (passphrase_info);
350      }              if (c->sym.sym_algo > 9)
351      if (c->cancel) {                  pos++;
352          WriteFile (hd, "\n", 1, &n, NULL);              /* XXX: be more strict. */
353          return gpg_error (GPG_ERR_EOF);              c->sym.s2k_mode = atoi (passphrase_info+pos);
354      }              c->sym.s2k_hash = atoi (passphrase_info+pos+2);
355            }
356      WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);  
357      WriteFile (hd, "\n", 1, &n, NULL);          keyid = parse_gpg_keyid (passphrase_info);
358      return 0;          pass = agent_get_cache (keyid+8, &item);        
359  }          if (pass) {
360                agent_unlock_cache_entry (&item);
361                c->pwd_init = 0;
362  /* Initialize the given passphrase callback @cb with the              if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
363     used gpgme context @ctx, the command @cmd and a title                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
364     @title for the dialog. */              if (!WriteFile (hd, "\n", 1, &n, NULL))
365  void                  log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
366  set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,              return 0;
367                         int cmd, HWND hwnd, const char *title)          }
368  {      }
369      memset (cb, 0, sizeof *cb);  
370      cb->gpg_cmd = cmd;      if (c->pwd_init) {
371      cb->is_card = 0;          if (keyid && strlen (keyid) == 16)
372      cb->cancel = 0;              strcpy (c->keyid, keyid+8);
373      cb->hwnd = hwnd;  
374      cb->pwd_init = 1;          /* if @passphrase_info contains 'OPENPGP' we assume a smart card
375      free_if_alloc (cb->title);              has been used. */
376      cb->title = m_strdup (title);          if (strstr (passphrase_info, "OPENPGP")) {
377      if (!cb->title)              const char *s=passphrase_info;
378          BUG (NULL);              while (s && *s && *s != 'D')
379      gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);                  s++;
380      cb->gpg = ctx;              _snprintf (c->info, DIM (c->info)-1,
381  }                         _("Please enter the PIN to unlock your secret card key\n"
382                             "Card: %s"), extract_serial_no (s));
383                c->is_card = 1;
384  /* Release a passphrase callback @ctx. */          }
385  void          else if (uid_hint)
386  release_gpg_passphrase_cb (passphrase_cb_s *ctx)              parse_gpg_description (uid_hint, passphrase_info,
387  {                                     c->info, sizeof (c->info) - 1);
388      if (!ctx)          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
389          return;              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
390      sfree_if_alloc (ctx->pwd);                                   (HWND)c->hwnd, passphrase_callback_proc,
391      free_if_alloc (ctx->title);                                   (LPARAM)c);
392  }          }
393            else if (c->gpg_cmd == GPG_CMD_SIGN) {
394  /* Simple check to measure passphrase (@pass) quality.              rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
395     Return value: 0 on success. */                                   (HWND)c->hwnd, passphrase_callback_proc,
396  int                                   (LPARAM)c);
397  check_passwd_quality (const char *pass, int strict)          }
398  {          if (rc == -1) {
399      int i, nd=0, nc=0, n;              if (!WriteFile (hd, "\n", 1, &n, NULL))
400                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
401      n = strlen (pass);              log_debug ("passphrase_cb: could not create dialog box\n");
402      if (n < 8)              return 0;
403          return -1;          }
404            c->pwd_init = 0;
405      for (i=0; i < n; i++) {      }
406          if (isdigit (pass[i])) nd++;      if (c->cancel || !c->pwd) {
407          if (isalpha (pass[i])) nc++;          if (!WriteFile (hd, "\n", 1, &n, NULL))
408      }              log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
409            return 0;
410      if (nd == n || nc == n)      }
411          return -1;  
412        if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
413      return 0;          log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
414  }      if (!WriteFile (hd, "\n", 1, &n, NULL))
415            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
416        return 0;
417    }
418    
419    
420    /* Initialize the given passphrase callback @cb with the
421       used gpgme context @ctx, the command @cmd and a title
422       @title for the dialog. */
423    void
424    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
425                           int cmd, HWND hwnd, const char *title)
426    {
427        memset (cb, 0, sizeof *cb);
428        cb->gpg_cmd = cmd;
429        cb->bad_pwd = 0;
430        cb->is_card = 0;
431        cb->cancel = 0;
432        cb->hwnd = hwnd;
433        cb->pwd_init = 1;
434        free_if_alloc (cb->title);
435        cb->title = m_strdup (title);
436        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
437        cb->gpg = ctx;
438    }
439    
440    
441    /* Release the gpg recipient list. */
442    void
443    release_gpg_recipients (gpgme_recipient_t *recipients)
444    {
445        gpgme_recipient_t r, n;
446    
447        r = *recipients;
448        while (r != NULL) {
449            n = r->next;
450            safe_free (r->keyid);
451            safe_free (r);
452            r = n;
453        }
454        *recipients = NULL;
455    }
456    
457    
458    
459    /* Release a passphrase callback @ctx. */
460    void
461    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
462    {
463        if (!ctx)
464            return;
465        sfree_if_alloc (ctx->pwd);
466        free_if_alloc (ctx->title);
467        release_gpg_recipients (&ctx->recipients);
468    }
469    
470    
471    /* _Simple_ check to measure passphrase (@pass) quality.
472       Return value: 0 on success. */
473    int
474    check_passwd_quality (const char *pass, int strict)
475    {
476        int i, nd=0, nc=0, n;
477    
478        /* A good passphrase should be at least 8 characters. */
479        n = strlen (pass);
480        if (n < 8)
481            return -1;
482    
483        for (i=0; i < n; i++) {
484            if (isdigit (pass[i]))
485                nd++;
486            if (isalpha (pass[i]))
487                nc++;
488        }
489    
490        /* Check that the passphrase contains letters and numbers. */
491        if (nd == n || nc == n)
492            return -1;
493    
494        return 0;
495    }
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