/[winpt]/trunk/Src/wptPassphraseCB.cpp
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revision 2 by twoaday, Mon Jan 31 11:02:21 2005 UTC revision 278 by twoaday, Mon Jan 15 22:02:04 2007 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,  #ifdef HAVE_CONFIG_H
18   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA  #include <config.h>
19   */  #endif
20    
21  #include <windows.h>  #include <windows.h>
22  #include <ctype.h>  #include <ctype.h>
23    
24  #include "../resource.h"  #include "resource.h"
25  #include "wptNLS.h"  #include "wptNLS.h"
26  #include "wptW32API.h"  #include "wptW32API.h"
27  #include "wptVersion.h"  #include "wptVersion.h"
28  #include "wptGPG.h"  #include "wptGPG.h"
29  #include "wptCommonCtl.h"  #include "wptCommonCtl.h"
30  #include "wptContext.h"  #include "wptContext.h"
31  #include "wptDlgs.h"  #include "wptDlgs.h"
32  #include "wptUTF8.h"  #include "wptErrors.h"
33  #include "wptErrors.h"  #include "wptTypes.h"
34  #include "wptTypes.h"  #include "wptKeylist.h"
35  #include "wptAgent.h"  #include "wptAgent.h"
36  #include "wptRegistry.h"  #include "wptRegistry.h"
37    #include "wptUTF8.h"
38    #include "StringBuffer.h"
39  #define item_ctrl_id( cmd ) \  
40      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)  
41    /* Return the control ID dependent on the mode (sign or decrypt). */
42    #define item_ctrl_id(cmd) \
43  BOOL CALLBACK      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
44  passphrase_callback_proc( HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam )  
45  {      #define item_ctrl_id2(cmd) \
46      static passphrase_cb_s * c;      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
47      static int yes = 1;  
48      gpgme_key_t key;  const char* get_symkey_algo (int algo);
49      const char * s, * id;  void ListBox_AddString_utf8 (HWND lb, const char *txt);
50      char info[768] = {0};  
51      void * ctx = NULL, * item;  
52      unsigned int pkalgo;  /* Overwrite passphrase and free memory. */
53    static void
54      switch( msg )  {  burn_passphrase (char **pwd)
55      case WM_INITDIALOG:  {
56          c = (passphrase_cb_s *)lparam;      char *pass = *pwd;
57          if( !c )  
58              BUG( NULL );      wipememory (pass, strlen (pass));
59          SetWindowText( dlg, c->title );      delete []pass;
60          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {      *pwd = NULL;
61              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,  }
62                  _("Encrypted with the following public key(s)") );  
63              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );  
64          }  /* Dialog procedure for the passphrase callback. */
65          else if( c->gpg_cmd == GPG_CMD_SIGN )  static BOOL CALLBACK
66              CheckDlgButton( dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED );  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
67          if( c->enc_to && c->gpg_cmd == GPG_CMD_DECRYPT ) {  {    
68              gpgme_recipients_enum_open( c->enc_to, &ctx );      static passphrase_cb_s *c;
69              while ( (s = gpgme_recipients_enum_read( c->enc_to, &ctx )) ) {      gpgme_decrypt_result_t res=NULL;
70                  pkalgo = *s; s++;      gpgme_sign_result_t res_sig=NULL;
71                  get_pubkey( s, &key );      gpgme_recipient_t recip=NULL, r;
72                  if( key ) {      winpt_key_s key;
73                      char * uid = NULL;      void *item;
74                      id = gpgme_key_get_string_attr( key, GPGME_ATTR_USERID, NULL, 0 );      int n;
75                      if( !id )  
76                          id = _("Invalid User ID");      switch (msg) {
77                      uid = utf8_to_wincp (id, strlen (id));                      case WM_ACTIVATE:
78                      _snprintf( info, sizeof info - 1, "%s (%s, 0x%s)", uid,          safe_edit_control_init (dlg, item_ctrl_id (c->gpg_cmd));
79                                  gpgme_key_expand_attr( GPGME_ATTR_ALGO, pkalgo ), s+8 );          break;
80                      free( uid );  
81                  }      case WM_DESTROY:
82                  else          safe_edit_control_free (dlg, item_ctrl_id (c->gpg_cmd));
83                      _snprintf( info, sizeof info - 1, _("Unknown (key ID 0x%s)"),          break;
84                                 s? s + 8 : "DEADBEEF" );  
85                  listbox_add_string( GetDlgItem( dlg, IDC_DECRYPT_LIST ), info );      case WM_INITDIALOG:
86              }          c = (passphrase_cb_s *)lparam;
87              gpgme_recipients_enum_close( c->enc_to, &ctx );          if (!c)
88          }              BUG (0);
89          SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
90                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,          SetWindowText (dlg, c->title);
91                          _("Please enter your passphrase") );          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
92          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {              SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
93              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
94              SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );                              _("Encrypted with the following public key(s)"));
95          }              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
96          else {          }
97              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );          else if (c->gpg_cmd == GPG_CMD_SIGN) {
98              SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
99          }              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
100          center_window( dlg );          }
101          SetForegroundWindow( dlg );          /* Because it depends on the order the keys are stored in the
102          set_active_window( dlg );             keyring whether res->recipients is complete or not, we also
103          return FALSE;             support that the recipients were externally extracted and then
104               we use this list. */
105          case WM_SYSCOMMAND:          if (c->recipients)
106              if( LOWORD( wparam ) == SC_CLOSE ) {              recip = c->recipients; /* recipients were already extracted. */
107                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );          else {
108                  c->cancel = 1;              res = gpgme_op_decrypt_result (c->gpg);
109                  EndDialog( dlg, TRUE );              if (res && res->recipients)
110              }                  recip = res->recipients;
111              return FALSE;          }
112            if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
113          case WM_COMMAND:              StringBuffer inf;
114              switch( HIWORD( wparam ) ) {  
115              case BN_CLICKED:              for (r = recip; r; r = r->next) {
116                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE                  memset (&key, 0, sizeof (key));
117                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                  if (!winpt_get_pubkey (r->keyid, &key)) {
118                      HWND hwnd;                      gpgme_user_id_t u = key.ctx->uids;
119                      yes ^= 1;                      
120                      hwnd = GetDlgItem( dlg, item_ctrl_id( c->gpg_cmd ) );                      inf = (u->name? u->name : _("Invalid User ID"));
121                      SendMessage( hwnd, EM_SETPASSWORDCHAR, yes? '*' : 0, 0 );                      if (u->email != NULL && strlen (u->email) > 1)
122                      SetFocus( hwnd );                          inf = inf + " <" + u->email + ">";
123                  }                      inf = inf + " (" + get_key_pubalgo (r->pubkey_algo);
124              }                      inf = inf + ", 0x" + (r->keyid+8) + ")";
125                    }
126              switch( LOWORD( wparam ) ) {                  else {
127              case IDOK:                      inf = _("Unknown key ID");
128                  /* fixme: the item is even cached when the passphrase is not                      inf = inf + " (" + get_key_pubalgo (r->pubkey_algo);
129                            correct, which means that the user needs to delete all                      inf = inf + ", 0x" + (r->keyid+8) + ")";
130                            cached entries to continue. */                  }
131                  GetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), c->pwd, sizeof c->pwd -1 );                  ListBox_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST),
132                  if( reg_prefs.cache_time > 0 && !c->is_card ) {                                          inf.getBuffer ());
133                      if( agent_get_cache( c->keyid, &item ) )                                      winpt_release_pubkey (&key);
134                          agent_unlock_cache_entry( &item );              }
135                      else          }
136                          agent_put_cache( c->keyid, c->pwd, reg_prefs.cache_time );          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
137                  }              EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
138                  EndDialog( dlg, TRUE );          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
139                  return TRUE;                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
140                                            c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
141              case IDCANCEL:                          _("Please enter your passphrase"));
142                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), ""  );          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
143                  c->cancel = 1;              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
144                  EndDialog( dlg, FALSE );              if (res && !res->recipients) {
145                  return FALSE;                  StringBuffer sinf;
146              }  
147              break;                  sinf = _("Symmetric encryption.");
148      }                  sinf = sinf + "\n" + get_symkey_algo (c->sym.sym_algo);
149                        sinf = sinf + " " + _("encrypted data.");
150      return FALSE;                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, sinf.getBuffer ());
151  } /* passphrase_callback_proc */              }
152                else
153                    SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
154  static const char *          }
155  parse_gpg_keyid( const char * desc )          else {
156  {              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
157      static char keyid[16+1];              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
158      char * p;          }
159                center_window (dlg, NULL);
160      p = strrchr( desc, '\n' );          SetForegroundWindow (dlg);
161      if( !p )          return FALSE;
162          return NULL;  
163      /* the format of the desc buffer looks like this:          case WM_COMMAND:
164         request_keyid[16] main_keyid[16] keytype[1] keylength[4]              switch (HIWORD (wparam)) {
165         we use the main keyid to use only one cache entry. */              case BN_CLICKED:
166      strncpy( keyid, desc+(p-desc+1+17), 16 );                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
167      return keyid;                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
168  } /* parse_gpg_keyid */                      HWND hwnd;
169                        int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
170                        hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
171  static void                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
172  parse_gpg_description( char * desc, int size )                      SetFocus (hwnd);
173  {                  }
174      char * buffer = NULL, ch, uid[128] = {0}, * uid2 = NULL;              }
175      char usedkey[16+1] = {0}, mainkey[16+1] = {0};  
176      const char * buf;              switch (LOWORD (wparam)) {
177      int i, algo, try_again = 0;              case IDOK:  
178                    /* XXX: the item is even cached when the passphrase is not
179      if( stristr( desc, "[User ID hint missing]" )                          correct, which means that the user needs to delete all
180          || stristr( desc, "[passphrase info missing]" ) ) {                          cached entries to continue. */
181          _snprintf( desc, size-1,                  if (c->pwd)
182                     _("You need a passphrase to unlock the secret key for\n"                      burn_passphrase (&c->pwd);
183                       "user: [UserID hint missing]\n"                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
184                       "      [passphrase info missing]\n") );                  if (!n) {
185          return;                      c->pwd = new char[2];
186      }                      if (!c->pwd)
187                            BUG (NULL);
188      buffer = new char[size+1];                      strcpy (c->pwd, "");
189      if( !buffer )                  }
190          BUG( NULL );                  else {
191      strcpy( buffer, desc );                      char *p = new char[n+2];
192      buf = buffer;                      if (!p)
193      if( strstr( buf, "TRY_AGAIN" ) ) {                          BUG (NULL);
194          buf += strlen( "TRY_AGAIN\n" );                      /* Get the passphrase and convert it utf8.
195          try_again = 1;                         This does not just the us-ascii charset. */
196      }                      SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), p, n+1);
197      else if( strstr( buf, "ENTER_PASSPHRASE" ) )                      c->pwd = native_to_utf8 (p);
198          buf += strlen( "ENTER_PASSPHRASE\n" );                      sfree_if_alloc (p);
199      else                  }
200          BUG( NULL );                  res = gpgme_op_decrypt_result (c->gpg);
201      buf += 17;                  if (!res)
202      for( i = 0; i < sizeof uid-1; i++ ) {                      res_sig = gpgme_op_sign_result (c->gpg);
203          ch = *buf++;                  if (!c->is_card && reg_prefs.cache_time > 0 &&
204          if( ch == '\n' ) {                      (res || res_sig)) {
205              uid[i] = '\0';                      if (agent_get_cache (c->keyid, &item))
206              break;                          agent_unlock_cache_entry (&item);
207          }                      else
208          uid[i] = ch;                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
209      }                  }
210      memcpy( usedkey, buf, 16 );                  c->cancel = 0;
211      usedkey[16] = '\0';                  EndDialog (dlg, TRUE);
212      buf += 17;                  return TRUE;
213      memcpy( mainkey, buf, 16 );                  
214      mainkey[16] = '\0';              case IDCANCEL:
215      buf += 17;                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
216      if( !buf )                  c->cancel = 1;
217          BUG( NULL );                  EndDialog (dlg, FALSE);
218      algo = atol( buf );                  return TRUE;
219      free_if_alloc( buffer );              }
220                break;
221      uid2 = utf8_to_wincp (uid, strlen (uid));      }
222        
223      if( strcmp( usedkey, mainkey ) )      return FALSE;
224          _snprintf( desc, size-1,  }
225                     _("You need a passphrase to unlock the secret key for\n"  
226                       "user: \"%s\"\n"  
227                       "%s key, ID %s (main key ID %s)\n"),  /* Extract the main keyid from @pass_info.
228                     uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),     Return value: long main keyid or NULL for an error. */
229                     usedkey+8, mainkey+8 );  static const char*
230      else if( !strcmp( usedkey, mainkey ) )  parse_gpg_keyid (const char *pass_info)
231          _snprintf( desc, size-1,  {
232                     _("You need a passphrase to unlock the secret key for\n"      static char keyid[16+1];
233                       "user: \"%s\"\n"      
234                       "%s key, ID %s\n"),      /* XXX: check for leading alpha-chars? */
235                       uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),      if (strlen (pass_info) < 16) {
236                       usedkey+8 );          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
237      free( uid2 );          return NULL;
238  } /* parse_gpg_describtion */      }
239        /* the format of the desc buffer looks like this:
240           request_keyid[16] main_keyid[16] keytype[1] keylength[4]
241  static int inline         we use the main keyid to use only one cache entry. */
242  is_hexstring( const char * p )      strncpy (keyid, pass_info+17, 16);
243  {      keyid[16] = 0;
244      size_t i;      return keyid;
245      for( i=0; i < strlen( p ); i++ ) {  }
246          if( !isxdigit( p[i] ) )  
247              return -1;  
248      }  /* Parse the information in @uid_hint and @pass_info to generate
249      return 0;     a input message for the user in @desc. */
250  }  static int
251    parse_gpg_description (const char *uid_hint, const char *pass_info,
252                           char *desc, int size)
253  const char *  {
254  passphrase_cb( void * opaque, const char * desc, void * r_hd )      gpgme_pubkey_algo_t algo;
255  {        char usedkey[16+1];
256      passphrase_cb_s * c = (passphrase_cb_s *)opaque;      char mainkey[16+1];
257      void * item;      char *p, *uid;
258      const char * pass, * keyid;      int n=0;
259      int rc = 0;  
260        algo = (gpgme_pubkey_algo_t)0;
261      if( !c )      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
262          return NULL;      if (strlen (uid_hint) < 17) {
263            *desc = 0;
264      if( desc ) {          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
265          keyid = parse_gpg_keyid( desc );          return -1;
266          pass = agent_get_cache( keyid, &item );      }
267          if( pass ) {  
268              agent_unlock_cache_entry( &item );      while (p = strsep ((char**)&pass_info, " ")) {
269              c->pwd_init = 0;          switch (n++) {
270              return pass;          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
271          }          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
272      }          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
273            }
274      if( c->pwd_init ) {      }
275          c->keyid = keyid;      uid_hint += 16; /* skip keyid */
276          /* if the desc has a length of 32 and only hex digits, we assume a      uid_hint += 1;  /* space */
277             smart card has been used. */  
278          /*log_box( "", 0, "%s %d %d", desc,strlen( desc), is_hexstring( desc ) );*/      uid = utf8_to_native (uid_hint);
279          if( desc && strlen( desc ) == 32 && !is_hexstring( desc ) ) {      if (strcmp (usedkey, mainkey))
280              char buf[16];          _snprintf (desc, size-1,
281              memset( buf, 0, sizeof buf );                     _("You need a passphrase to unlock the secret key for user:\n"
282              strncpy( buf, desc+20, 8 );                       "\"%s\"\n"
283              _snprintf( c->info, sizeof c->info-1,                       "%s key, ID 0x%s (main key ID 0x%s)\n"),
284                      _("Please enter the PIN to unlock your secret card key\n"                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
285                        "Card: %s"), buf );      else if (!strcmp (usedkey, mainkey))
286              c->is_card = 1;          _snprintf (desc, size-1,
287          }                     _("You need a passphrase to unlock the secret key for user:\n"
288          else if( desc ) {                       "\"%s\"\n"
289              strcpy( c->info, desc );                       "%s key, ID 0x%s\n"),
290              parse_gpg_description( c->info, sizeof c->info - 1 );                       uid, get_key_pubalgo (algo), usedkey+8);
291          }      safe_free (uid);
292          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {      return 0;
293              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,  }
294                                  (HWND)c->hwnd, passphrase_callback_proc,  
295                                  (LPARAM)c );  
296          }  /* Extract the serial number from the card ID @id and return it. */
297          else if( c->gpg_cmd == GPG_CMD_SIGN ) {  const char*
298              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,  extract_serial_no (const char *id)
299                                  (HWND)c->hwnd, passphrase_callback_proc,  {
300                                  (LPARAM)c );      static char buf[8];
301          }      char *p;
302          if( rc == -1 )  
303              return NULL;      p = strchr (id, '/');
304          c->pwd_init = 0;      if (!p) {
305      }          log_debug ("extract_serial_no: error '%s'\r\n", id);
306            return "";
307      if( c->cancel )      }
308          return NULL;      memset (buf, 0, sizeof (buf));
309        strncpy (buf, id+(p-id)-6, 6);
310      return c->pwd;      return buf;
311  } /* passphrase_cb */  }
312    
313    
314  void  /* Passphrase callback with the ability to support caching. */
315  set_gpg_passphrase_cb( gpgme_ctx_t c, passphrase_cb_s * ctx, int cmd,  gpgme_error_t
316                         HWND hwnd, const char * title )  passphrase_cb (void *hook, const char *uid_hint,
317  {                 const char *passphrase_info,
318      ctx->gpg_cmd = cmd;                 int prev_was_bad, int fd)
319      ctx->is_card = 0;  {
320      ctx->cancel = 0;      passphrase_cb_s *c = (passphrase_cb_s*)hook;
321      ctx->hwnd = hwnd;      HANDLE hd = (HANDLE)fd;
322      ctx->pwd_init = 1;      void *item;
323      if( strlen( title ) > 256 )      const char *keyid=NULL, *pass;
324          BUG( NULL ); /* check bounds */      DWORD n;
325      strcpy( ctx->title, title );      int rc = 0;
326      gpgme_set_passphrase_cb( c, passphrase_cb, ctx );  
327  } /* set_gpg_passphrase_cb */      if (!c) {
328            log_debug ("passphrase_cb: error no valid callback\r\n");
329            return gpg_error (GPG_ERR_INV_ARG);
330        }
331        c->bad_pwd = prev_was_bad? 1 : 0;
332        if (prev_was_bad && !c->cancel) {
333            if (c->pwd)
334                burn_passphrase (&c->pwd);
335            agent_del_cache (c->keyid);
336            c->pwd_init = 1;
337        }
338    
339        if (passphrase_info) {
340            if (strlen (passphrase_info) < 16 &&
341                !strstr (passphrase_info, "OPENPGP")) {
342                /* assume symetric encryption. */
343                int pos=2;
344                c->sym.sym_algo = atoi (passphrase_info);
345                if (c->sym.sym_algo > 9)
346                    pos++;
347                /* XXX: be more strict. */
348                c->sym.s2k_mode = atoi (passphrase_info+pos);
349                c->sym.s2k_hash = atoi (passphrase_info+pos+2);
350            }
351    
352            keyid = parse_gpg_keyid (passphrase_info);
353            pass = agent_get_cache (keyid+8, &item);        
354            if (pass) {
355                agent_unlock_cache_entry (&item);
356                c->pwd_init = 0;
357                if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
358                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
359                if (!WriteFile (hd, "\n", 1, &n, NULL))
360                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
361                return 0;
362            }
363        }
364    
365        if (c->pwd_init) {
366            if (keyid && strlen (keyid) == 16)
367                strcpy (c->keyid, keyid+8);
368    
369            /* if @passphrase_info contains 'OPENPGP' we assume a smart card
370                has been used. */
371            if (strstr (passphrase_info, "OPENPGP")) {
372                const char *s=passphrase_info;
373                while (s && *s && *s != 'D')
374                    s++;
375                _snprintf (c->info, sizeof (c->info)-1,
376                           _("Please enter the PIN to unlock your secret card key\n"
377                             "Card: %s"), extract_serial_no (s));
378                c->is_card = 1;
379            }
380            else if (uid_hint)
381                parse_gpg_description (uid_hint, passphrase_info,
382                                       c->info, sizeof (c->info) - 1);
383            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
384                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
385                                     (HWND)c->hwnd, passphrase_callback_proc,
386                                     (LPARAM)c);
387            }
388            else if (c->gpg_cmd == GPG_CMD_SIGN) {
389                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
390                                     (HWND)c->hwnd, passphrase_callback_proc,
391                                     (LPARAM)c);
392            }
393            if (rc == -1) {
394                if (!WriteFile (hd, "\n", 1, &n, NULL))
395                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
396                log_debug ("passphrase_cb: could not create dialog box\n");
397                return 0;
398            }
399            c->pwd_init = 0;
400        }
401        if (c->cancel || !c->pwd) {
402            if (!WriteFile (hd, "\n", 1, &n, NULL))
403                log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
404            return 0;
405        }
406    
407        if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
408            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
409        if (!WriteFile (hd, "\n", 1, &n, NULL))
410            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
411        return 0;
412    }
413    
414    
415    /* Initialize the given passphrase callback @cb with the
416       used gpgme context @ctx, the command @cmd and a title
417       @title for the dialog. */
418    void
419    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
420                           int cmd, HWND hwnd, const char *title)
421    {
422        memset (cb, 0, sizeof *cb);
423        cb->gpg_cmd = cmd;
424        cb->bad_pwd = 0;
425        cb->is_card = 0;
426        cb->cancel = 0;
427        cb->hwnd = hwnd;
428        cb->pwd_init = 1;
429        free_if_alloc (cb->title);
430        cb->title = m_strdup (title);
431        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
432        cb->gpg = ctx;
433    }
434    
435    
436    /* Release the gpg recipient list. */
437    void
438    release_gpg_recipients (gpgme_recipient_t *recipients)
439    {
440        gpgme_recipient_t r, n;
441    
442        r = *recipients;
443        while (r != NULL) {
444            n = r->next;
445            safe_free (r->keyid);
446            safe_free (r);
447            r = n;
448        }
449        *recipients = NULL;
450    }
451    
452    
453    
454    /* Release a passphrase callback @ctx. */
455    void
456    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
457    {
458        if (!ctx)
459            return;
460        sfree_if_alloc (ctx->pwd);
461        free_if_alloc (ctx->title);
462        release_gpg_recipients (&ctx->recipients);
463    }
464    
465    
466    /* _Simple_ check to measure passphrase (@pass) quality.
467       Return value: 0 on success. */
468    int
469    check_passwd_quality (const char *pass, int strict)
470    {
471        int i, nd=0, nc=0, n;
472    
473        /* A good passphrase should be at least 8 characters. */
474        n = strlen (pass);
475        if (n < 8)
476            return -1;
477    
478        for (i=0; i < n; i++) {
479            if (isdigit (pass[i]))
480                nd++;
481            if (isalpha (pass[i]))
482                nc++;
483        }
484    
485        /* Check that the passphrase contains letters and numbers. */
486        if (nd == n || nc == n)
487            return -1;
488    
489        return 0;
490    }
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