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

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revision 22 by twoaday, Wed Aug 10 11:33:35 2005 UTC revision 255 by twoaday, Tue Aug 1 16:37:23 2006 UTC
# Line 1  Line 1 
1  /* wptPassphraseCB.cpp - GPGME Passphrase Callback  /* wptPassphraseCB.cpp - GPGME Passphrase Callback
2   *      Copyright (C) 2001, 2002, 2003 Timo Schulz   *      Copyright (C) 2001, 2002-2006 Timo Schulz
3   *   *      Copyright (C) 2005 g10 Code GmbH
4   * This file is part of WinPT.   *
5   *   * This file is part of WinPT.
6   * WinPT is free software; you can redistribute it and/or   *
7   * modify it under the terms of the GNU General Public License   * WinPT is free software; you can redistribute it and/or
8   * as published by the Free Software Foundation; either version 2   * modify it under the terms of the GNU General Public License
9   * of the License, or (at your option) any later version.   * as published by the Free Software Foundation; either version 2
10   *     * of the License, or (at your option) any later version.
11   * WinPT is distributed in the hope that it will be useful,   *  
12   * but WITHOUT ANY WARRANTY; without even the implied warranty of   * WinPT is distributed in the hope that it will be useful,
13   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * General Public License for more details.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   *   * General Public License for more details.
16   * You should have received a copy of the GNU General Public License   *
17   * along with WinPT; if not, write to the Free Software Foundation,   * You should have received a copy of the GNU General Public License
18   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA   * along with WinPT; if not, write to the Free Software Foundation,
19   */   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20     */
21  #include <windows.h>  
22  #include <ctype.h>  #ifdef HAVE_CONFIG_H
23    #include <config.h>
24  #include "../resource.h"  #endif
25  #include "wptNLS.h"  
26  #include "wptW32API.h"  #include <windows.h>
27  #include "wptVersion.h"  #include <ctype.h>
28  #include "wptGPG.h"  
29  #include "wptCommonCtl.h"  #include "resource.h"
30  #include "wptContext.h"  #include "wptNLS.h"
31  #include "wptDlgs.h"  #include "wptW32API.h"
32  #include "wptUTF8.h"  #include "wptVersion.h"
33  #include "wptErrors.h"  #include "wptGPG.h"
34  #include "wptTypes.h"  #include "wptCommonCtl.h"
35  #include "wptAgent.h"  #include "wptContext.h"
36  #include "wptRegistry.h"  #include "wptDlgs.h"
37    #include "wptErrors.h"
38    #include "wptTypes.h"
39  #define item_ctrl_id( cmd ) \  #include "wptKeylist.h"
40      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)  #include "wptAgent.h"
41    #include "wptRegistry.h"
42  #define item_ctrl_id2(cmd) \  #include "wptUTF8.h"
43      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)  
44    
45    /* Return the control ID dependent on the mode (sign or decrypt). */
46  BOOL CALLBACK  #define item_ctrl_id(cmd) \
47  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
48  {      
49      static passphrase_cb_s * c;  #define item_ctrl_id2(cmd) \
50      gpgme_key_t key;      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
51      const char * s, * id;  
52      char info[768] = {0};  const char* get_symkey_algo (int algo);
53      void * ctx = NULL, * item;  void ListBox_AddString_utf8 (HWND lb, const char *txt);
54      unsigned int pkalgo;  
55    
56      switch( msg )  {  /* Overwrite passphrase and free memory. */
57      case WM_INITDIALOG:  static void
58          c = (passphrase_cb_s *)lparam;  burn_passphrase (char **pwd)
59          if (!c)  {
60              BUG (0);      char *pass = *pwd;
61          SetWindowText (dlg, c->title);      wipememory (pass, strlen (pass));
62          if (c->gpg_cmd == GPG_CMD_DECRYPT) {      delete []pass;
63              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,      *pwd = NULL;
64                  _("Encrypted with the following public key(s)") );  }
65              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );  
66          }  
67          else if( c->gpg_cmd == GPG_CMD_SIGN )  /* Dialog procedure for the passphrase callback. */
68              CheckDlgButton( dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED );  static BOOL CALLBACK
69          if( c->enc_to && c->gpg_cmd == GPG_CMD_DECRYPT ) {  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
70              gpgme_recipients_enum_open( c->enc_to, &ctx );  {    
71              while ( (s = gpgme_recipients_enum_read( c->enc_to, &ctx )) ) {      static passphrase_cb_s *c;
72                  pkalgo = *s; s++;      gpgme_decrypt_result_t res=NULL;
73                  get_pubkey( s, &key );      gpgme_sign_result_t res_sig=NULL;
74                  if( key ) {      gpgme_recipient_t recip=NULL, r;
75                      char * uid = NULL;      winpt_key_s key;
76                      id = gpgme_key_get_string_attr( key, GPGME_ATTR_USERID, NULL, 0 );      void *item;
77                      if( !id )      const char *id;
78                          id = _("Invalid User ID");      char *info;
79                      uid = utf8_to_wincp (id, strlen (id));                      int n;
80                      _snprintf( info, sizeof info - 1, "%s (%s, 0x%s)", uid,  
81                                  gpgme_key_expand_attr( GPGME_ATTR_ALGO, pkalgo ), s+8 );      switch (msg) {
82                      free( uid );      case WM_ACTIVATE:
83                  }          safe_edit_control_init (dlg, item_ctrl_id (c->gpg_cmd));
84                  else          break;
85                      _snprintf( info, sizeof info - 1, _("Unknown (key ID 0x%s)"),  
86                                 s? s + 8 : "DEADBEEF" );      case WM_DESTROY:
87                  listbox_add_string( GetDlgItem( dlg, IDC_DECRYPT_LIST ), info );          safe_edit_control_free (dlg, item_ctrl_id (c->gpg_cmd));
88              }          break;
89              gpgme_recipients_enum_close( c->enc_to, &ctx );  
90          }      case WM_INITDIALOG:
91          SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?          c = (passphrase_cb_s *)lparam;
92                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,          if (!c)
93                          _("Please enter your passphrase") );              BUG (0);
94          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
95              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );          SetWindowText (dlg, c->title);
96              SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
97          }              SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
98          else {              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
99              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );                              _("Encrypted with the following public key(s)"));
100              SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
101          }          }
102          center_window( dlg );          else if (c->gpg_cmd == GPG_CMD_SIGN) {
103          SetForegroundWindow( dlg );              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
104          set_active_window( dlg );              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
105          return FALSE;          }
106            /* Because it depends on the order the keys are stored in the
107          case WM_SYSCOMMAND:             keyring whether res->recipients is complete or not, we also
108              if( LOWORD( wparam ) == SC_CLOSE ) {             support that the recipients were externally extracted and then
109                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );             we use this list. */
110                  c->cancel = 1;          if (c->recipients)
111                  EndDialog( dlg, TRUE );              recip = c->recipients; /* recipients were already extracted. */
112              }          else {
113              return FALSE;              res = gpgme_op_decrypt_result (c->gpg);
114                if (res && res->recipients)
115          case WM_COMMAND:                  recip = res->recipients;
116              switch( HIWORD( wparam ) ) {          }
117              case BN_CLICKED:          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
118                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE              for (r = recip; r; r = r->next) {
119                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                  memset (&key, 0, sizeof (key));
120                      HWND hwnd;                  if (!winpt_get_pubkey (r->keyid, &key)) {
121                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));                      gpgme_user_id_t u = key.ctx->uids;
122                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));  
123                      SendMessage( hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0 );                      id = u->name;
124                      SetFocus (hwnd);                      if (!id)
125                  }                          id = _("Invalid User ID");
126              }                      n = 32+strlen (id)+1+4+strlen (r->keyid)+1;
127                        if (u->email)
128              switch (LOWORD (wparam)) {                          n += strlen (u->email)+1;
129              case IDOK:                        info = new char [n+1];
130                  /* fixme: the item is even cached when the passphrase is not                      if (!info)
131                            correct, which means that the user needs to delete all                          BUG (NULL);
132                            cached entries to continue. */                      if (!u->email || strlen (u->email) < 1)
133                  GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, sizeof (c->pwd) -1);                          sprintf (info, "%s (%s, 0x%s)", id,
134                  if (reg_prefs.cache_time > 0 && !c->is_card && !strstr (c->keyid, "missing")) {                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
135                      if (agent_get_cache (c->keyid, &item))                      else
136                          agent_unlock_cache_entry (&item);                          sprintf (info, "%s <%s> (%s, 0x%s)", id, u->email,
137                      else                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
138                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                  }
139                  }                  else {
140                  EndDialog (dlg, TRUE);                      info = new char [32 + strlen (r->keyid)+1 + 4];
141                  return TRUE;                      if (!info)
142                                            BUG (NULL);
143              case IDCANCEL:                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
144                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
145                  c->cancel = 1;                  }
146                  EndDialog (dlg, FALSE);                  ListBox_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
147                  return FALSE;                  free_if_alloc (info);
148              }                  winpt_release_pubkey (&key);
149              break;              }
150      }          }
151                else if (c->gpg_cmd == GPG_CMD_DECRYPT)
152      return FALSE;              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
153  } /* passphrase_callback_proc */          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
154                            IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
155                            c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
156  static const char *                          _("Please enter your passphrase"));
157  parse_gpg_keyid (const char * desc)          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
158  {              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
159      static char keyid[16+1];              if (res && !res->recipients) {
160      char * p;                  const char *s = _("Symmetric encryption.\n"
161                                          "%s encrypted data.");
162      p = strrchr (desc, '\n');                  const char *alg = get_symkey_algo (c->sym.sym_algo);
163      if( !p )                  info = new char[strlen (s) + strlen (alg) + 2];
164          return NULL;                  if (!info)
165      /* the format of the desc buffer looks like this:                      BUG (NULL);
166         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                  sprintf (info, s, alg);
167         we use the main keyid to use only one cache entry. */                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
168      strncpy (keyid, desc+(p-desc+1+17), 16);                  free_if_alloc (info);
169      return keyid;              }
170  } /* parse_gpg_keyid */              else
171                    SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
172            }
173  static void          else {
174  parse_gpg_description( char * desc, int size )              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
175  {              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
176      char * buffer = NULL, ch, uid[128] = {0}, * uid2 = NULL;          }
177      char usedkey[16+1] = {0}, mainkey[16+1] = {0};          center_window (dlg, NULL);
178      const char * buf;          SetForegroundWindow (dlg);
179      int i, algo, try_again = 0;          return FALSE;
180    
181      if( stristr( desc, "[User ID hint missing]" )          case WM_SYSCOMMAND:
182          || stristr( desc, "[passphrase info missing]" ) ) {              if (LOWORD (wparam) == SC_CLOSE) {
183          _snprintf( desc, size-1,                  c->cancel = 1;
184                     _("You need a passphrase to unlock the secret key for\n"                  EndDialog (dlg, TRUE);
185                       "user: [UserID hint missing]\n"              }
186                       "      [passphrase info missing]\n") );              break;
187          return;  
188      }          case WM_COMMAND:
189                switch (HIWORD (wparam)) {
190      buffer = new char[size+1];              case BN_CLICKED:
191      if( !buffer )                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
192          BUG( NULL );                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
193      strcpy( buffer, desc );                      HWND hwnd;
194      buf = buffer;                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
195      if( strstr( buf, "TRY_AGAIN" ) ) {                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
196          buf += strlen( "TRY_AGAIN\n" );                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
197          try_again = 1;                      SetFocus (hwnd);
198      }                  }
199      else if( strstr( buf, "ENTER_PASSPHRASE" ) )              }
200          buf += strlen( "ENTER_PASSPHRASE\n" );  
201      else              switch (LOWORD (wparam)) {
202          BUG( NULL );              case IDOK:  
203      buf += 17;                  /* XXX: the item is even cached when the passphrase is not
204      for( i = 0; i < sizeof uid-1; i++ ) {                          correct, which means that the user needs to delete all
205          ch = *buf++;                          cached entries to continue. */
206          if( ch == '\n' ) {                  if (c->pwd)
207              uid[i] = '\0';                      burn_passphrase (&c->pwd);
208              break;                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
209          }                  if (!n) {
210          uid[i] = ch;                      c->pwd = new char[2];
211      }                      if (!c->pwd)
212      memcpy( usedkey, buf, 16 );                          BUG (NULL);
213      usedkey[16] = '\0';                      strcpy (c->pwd, "");
214      buf += 17;                  }
215      memcpy( mainkey, buf, 16 );                  else {
216      mainkey[16] = '\0';                      char *p = new char[n+2];
217      buf += 17;                      if (!p)
218      if( !buf )                          BUG (NULL);
219          BUG( NULL );                      /* Get the passphrase and convert it utf8.
220      algo = atol( buf );                         This does not just the us-ascii charset. */
221      free_if_alloc( buffer );                      SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), p, n+1);
222                        c->pwd = native_to_utf8 (p);
223      uid2 = utf8_to_wincp (uid, strlen (uid));                      sfree_if_alloc (p);
224                    }
225      if( strcmp( usedkey, mainkey ) )                  res = gpgme_op_decrypt_result (c->gpg);
226          _snprintf( desc, size-1,                  if (!res)
227                     _("You need a passphrase to unlock the secret key for\n"                      res_sig = gpgme_op_sign_result (c->gpg);            
228                       "user: \"%s\"\n"                  if (!c->is_card && reg_prefs.cache_time > 0 &&
229                       "%s key, ID %s (main key ID %s)\n"),                      (res || res_sig)) {
230                     uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),                      if (agent_get_cache (c->keyid, &item))
231                     usedkey+8, mainkey+8 );                          agent_unlock_cache_entry (&item);
232      else if( !strcmp( usedkey, mainkey ) )                      else
233          _snprintf( desc, size-1,                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
234                     _("You need a passphrase to unlock the secret key for\n"                  }
235                       "user: \"%s\"\n"                  c->cancel = 0;
236                       "%s key, ID %s\n"),                  EndDialog (dlg, TRUE);
237                       uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),                  return TRUE;
238                       usedkey+8 );                  
239      free( uid2 );              case IDCANCEL:
240  } /* parse_gpg_describtion */                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
241                    c->cancel = 1;
242                    EndDialog (dlg, FALSE);
243  static int inline                  return FALSE;
244  is_hexstring( const char * p )              }
245  {              break;
246      size_t i;      }
247      for( i=0; i < strlen( p ); i++ ) {      
248          if( !isxdigit( p[i] ) )      return FALSE;
249              return -1;  }
250      }  
251      return 0;  
252  }  /* Extract the main keyid from @pass_info.
253       Return value: long main keyid or NULL for an error. */
254    static const char*
255  const char *  parse_gpg_keyid (const char *pass_info)
256  passphrase_cb( void * opaque, const char * desc, void * r_hd )  {
257  {        static char keyid[16+1];
258      passphrase_cb_s * c = (passphrase_cb_s *)opaque;      
259      void * item;      /* XXX: check for leading alpha-chars? */
260      const char * pass, * keyid;      if (strlen (pass_info) < 16) {
261      int rc = 0;          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
262            return NULL;
263      if( !c )      }
264          return NULL;      /* the format of the desc buffer looks like this:
265           request_keyid[16] main_keyid[16] keytype[1] keylength[4]
266      if( desc ) {         we use the main keyid to use only one cache entry. */
267          keyid = parse_gpg_keyid (desc);      strncpy (keyid, pass_info+17, 16);
268          pass = agent_get_cache( keyid, &item );      keyid[16] = 0;
269          if( pass ) {      return keyid;
270              agent_unlock_cache_entry( &item );  }
271              c->pwd_init = 0;  
272              return pass;  
273          }  /* Parse the information in @uid_hint and @pass_info to generate
274      }     a input message for the user in @desc. */
275    static int
276      if( c->pwd_init ) {  parse_gpg_description (const char *uid_hint, const char *pass_info,
277          c->keyid = keyid;                         char *desc, int size)
278          /* if the desc has a length of 32 and only hex digits, we assume a  {
279             smart card has been used. */      gpgme_pubkey_algo_t algo;
280          /*log_box( "", 0, "%s %d %d", desc,strlen( desc), is_hexstring( desc ) );*/      char usedkey[16+1];
281          if( desc && strlen( desc ) == 32 && !is_hexstring( desc ) ) {      char mainkey[16+1];
282              char buf[16];      char *p, *uid;
283              memset( buf, 0, sizeof buf );      int n=0;
284              strncpy( buf, desc+20, 8 );  
285              _snprintf( c->info, sizeof c->info-1,      algo = (gpgme_pubkey_algo_t)0;
286                      _("Please enter the PIN to unlock your secret card key\n"      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
287                        "Card: %s"), buf );      if (strlen (uid_hint) < 17) {
288              c->is_card = 1;          *desc = 0;
289          }          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
290          else if(desc) {          return -1;
291              strcpy (c->info, desc);      }
292              parse_gpg_description (c->info, sizeof c->info - 1);  
293          }      while (p = strsep ((char**)&pass_info, " ")) {
294          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {          switch (n++) {
295              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
296                                  (HWND)c->hwnd, passphrase_callback_proc,          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
297                                  (LPARAM)c );          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
298          }          }
299          else if( c->gpg_cmd == GPG_CMD_SIGN ) {      }
300              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,      uid_hint += 16; /* skip keyid */
301                                  (HWND)c->hwnd, passphrase_callback_proc,      uid_hint += 1;  /* space */
302                                  (LPARAM)c );  
303          }      uid = utf8_to_native (uid_hint);
304          if( rc == -1 )      if (strcmp (usedkey, mainkey))
305              return NULL;          _snprintf (desc, size-1,
306          c->pwd_init = 0;                     _("You need a passphrase to unlock the secret key for user:\n"
307      }                       "\"%s\"\n"
308                         "%s key, ID 0x%s (main key ID 0x%s)\n"),
309      if( c->cancel )                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
310          return NULL;      else if (!strcmp (usedkey, mainkey))
311            _snprintf (desc, size-1,
312      return c->pwd;                     _("You need a passphrase to unlock the secret key for user:\n"
313  } /* passphrase_cb */                       "\"%s\"\n"
314                         "%s key, ID 0x%s\n"),
315                         uid, get_key_pubalgo (algo), usedkey+8);
316  void      safe_free (uid);
317  set_gpg_passphrase_cb (gpgme_ctx_t c, passphrase_cb_s *ctx, int cmd,      return 0;
318                         HWND hwnd, const char *title)  }
319  {  
320      ctx->gpg_cmd = cmd;  
321      ctx->is_card = 0;  /* Extract the serial number from the card ID @id and return it. */
322      ctx->cancel = 0;  const char*
323      ctx->hwnd = hwnd;  extract_serial_no (const char *id)
324      ctx->pwd_init = 1;  {
325      if (strlen (title) > 256)      static char buf[8];
326          BUG (NULL); /* check bounds */      char *p;
327      strcpy (ctx->title, title);  
328      gpgme_set_passphrase_cb (c, passphrase_cb, ctx);      p = strchr (id, '/');
329  } /* set_gpg_passphrase_cb */      if (!p) {
330            log_debug ("extract_serial_no: error '%s'\r\n", id);
331            return NULL;
332  int      }
333  check_passwd_quality (const char *pass, int strict)      strncpy (buf, id+(p-id)-6, 6);
334  {      return buf;
335      int i, nd=0, nc=0, n;  }
336    
337      n = strlen (pass);  
338      if (n < 8)  /* Passphrase callback with the ability to support caching. */
339          return -1;  gpgme_error_t
340    passphrase_cb (void *hook, const char *uid_hint,
341      for (i=0; i < n; i++) {                 const char *passphrase_info,
342          if (isdigit (pass[i])) nd++;                 int prev_was_bad, int fd)
343          if (isalpha (pass[i])) nc++;  {
344      }      passphrase_cb_s *c = (passphrase_cb_s*)hook;
345        HANDLE hd = (HANDLE)fd;
346      if (nd == n || nc == n)      void *item;
347          return -1;      const char *keyid=NULL, *pass;
348        DWORD n;
349      return 0;      int rc = 0;
350  }  
351        if (!c) {
352            log_debug ("passphrase_cb: error '!c'\r\n");
353            return gpg_error (GPG_ERR_INV_ARG);
354        }
355        c->bad_pwd = prev_was_bad? 1 : 0;
356        if (prev_was_bad && !c->cancel) {
357            if (c->pwd)
358                burn_passphrase (&c->pwd);
359            agent_del_cache (c->keyid);
360            c->pwd_init = 1;
361        }
362    
363        if (passphrase_info) {
364            if (strlen (passphrase_info) < 16 &&
365                !strstr (passphrase_info, "OPENPGP")) {
366                /* assume symetric encryption. */
367                int pos=2;
368                c->sym.sym_algo = atoi (passphrase_info);
369                if (c->sym.sym_algo > 9)
370                    pos++;
371                /* XXX: be more strict. */
372                c->sym.s2k_mode = atoi (passphrase_info+pos);
373                c->sym.s2k_hash = atoi (passphrase_info+pos+2);
374            }
375    
376            keyid = parse_gpg_keyid (passphrase_info);
377            pass = agent_get_cache (keyid+8, &item);        
378            if (pass) {
379                agent_unlock_cache_entry (&item);
380                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                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
385                return 0;
386            }
387        }
388    
389        if (c->pwd_init) {
390            if (keyid && strlen (keyid) == 16)
391                strcpy (c->keyid, keyid+8);
392    
393            /* if @passphrase_info contains 'OPENPGP' we assume a smart card
394                has been used. */
395            if (strstr (passphrase_info, "OPENPGP")) {
396                const char *s=passphrase_info;
397                while (s && *s && *s != 'D')
398                    s++;
399                _snprintf (c->info, sizeof c->info-1,
400                           _("Please enter the PIN to unlock your secret card key\n"
401                             "Card: %s"), extract_serial_no (s));
402                c->is_card = 1;
403            }
404            else if (uid_hint)
405                parse_gpg_description (uid_hint, passphrase_info,
406                                       c->info, sizeof (c->info) - 1);
407            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
408                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
409                                     (HWND)c->hwnd, passphrase_callback_proc,
410                                     (LPARAM)c);
411            }
412            else if (c->gpg_cmd == GPG_CMD_SIGN) {
413                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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