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

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revision 4 by twoaday, Sun Feb 6 11:11:40 2005 UTC revision 214 by twoaday, Sun May 14 18:40:36 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, 2003, 2005, 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    #include "wptUTF8.h"
43  BOOL CALLBACK  
44  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)  const char* get_symkey_algo (int algo);
45  {      
46      static passphrase_cb_s * c;  #define item_ctrl_id(cmd) \
47      static int hide = 1;      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
48      gpgme_key_t key;  
49      const char * s, * id;  #define item_ctrl_id2(cmd) \
50      char info[768] = {0};      ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
51      void * ctx = NULL, * item;  
52      unsigned int pkalgo;  
53    void ListBox_AddString_utf8 (HWND lb, const char *txt);
54      switch( msg )  {  
55      case WM_INITDIALOG:  /* Overwrite passphrase and free memory. */
56          hide = 1;  static void
57          c = (passphrase_cb_s *)lparam;  burn_passphrase (char **pwd)
58          if (!c)  {
59              BUG (0);      char *pass = *pwd;
60          SetWindowText (dlg, c->title);      wipememory (pass, strlen (pass));
61          if (c->gpg_cmd == GPG_CMD_DECRYPT) {      delete []pass;
62              SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,      *pwd = NULL;
63                  _("Encrypted with the following public key(s)") );  }
64              CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );  
65          }  
66          else if( c->gpg_cmd == GPG_CMD_SIGN )  /* Dialog procedure for the passphrase callback. */
67              CheckDlgButton( dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED );  static BOOL CALLBACK
68          if( c->enc_to && c->gpg_cmd == GPG_CMD_DECRYPT ) {  passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
69              gpgme_recipients_enum_open( c->enc_to, &ctx );  {    
70              while ( (s = gpgme_recipients_enum_read( c->enc_to, &ctx )) ) {      static passphrase_cb_s *c;
71                  pkalgo = *s; s++;      gpgme_decrypt_result_t res=NULL;
72                  get_pubkey( s, &key );      gpgme_sign_result_t res_sig=NULL;
73                  if( key ) {      gpgme_key_t key;
74                      char * uid = NULL;      gpgme_recipient_t recip=NULL, r;
75                      id = gpgme_key_get_string_attr( key, GPGME_ATTR_USERID, NULL, 0 );      void *item;
76                      if( !id )      const char *id;
77                          id = _("Invalid User ID");      char *info;
78                      uid = utf8_to_wincp (id, strlen (id));                      int n;
79                      _snprintf( info, sizeof info - 1, "%s (%s, 0x%s)", uid,  
80                                  gpgme_key_expand_attr( GPGME_ATTR_ALGO, pkalgo ), s+8 );      switch (msg) {
81                      free( uid );      case WM_ACTIVATE:
82                  }          safe_edit_control_init (dlg, item_ctrl_id (c->gpg_cmd));
83                  else          break;
84                      _snprintf( info, sizeof info - 1, _("Unknown (key ID 0x%s)"),  
85                                 s? s + 8 : "DEADBEEF" );      case WM_DESTROY:
86                  listbox_add_string( GetDlgItem( dlg, IDC_DECRYPT_LIST ), info );          safe_edit_control_free (dlg, item_ctrl_id (c->gpg_cmd));
87              }          break;
88              gpgme_recipients_enum_close( c->enc_to, &ctx );  
89          }      case WM_INITDIALOG:
90          SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?          c = (passphrase_cb_s *)lparam;
91                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,          if (!c)
92                          _("Please enter your passphrase") );              BUG (0);
93          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {          SetDlgItemText (dlg, IDCANCEL, _("&Cancel"));
94              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );          SetWindowText (dlg, c->title);
95              SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
96          }              SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide Typing"));
97          else {              SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
98              SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );                              _("Encrypted with the following public key(s)"));
99              SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );              CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
100          }          }
101          center_window( dlg );          else if (c->gpg_cmd == GPG_CMD_SIGN) {
102          SetForegroundWindow( dlg );              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_HIDE, _("&Hide Typing"));
103          set_active_window( dlg );              CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
104          return FALSE;          }
105            /* Because it depends on the order the keys are stored in the
106          case WM_SYSCOMMAND:             keyring whether res->recipients is complete or not, we also
107              if( LOWORD( wparam ) == SC_CLOSE ) {             support that the recipients were externally extracted and then
108                  SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );             we use this list. */
109                  c->cancel = 1;          if (c->recipients)
110                  EndDialog( dlg, TRUE );              recip = c->recipients; /* recipients were already extracted. */
111              }          else {
112              return FALSE;              res = gpgme_op_decrypt_result (c->gpg);
113                if (res && res->recipients)
114          case WM_COMMAND:                  recip = res->recipients;
115              switch( HIWORD( wparam ) ) {          }
116              case BN_CLICKED:          if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
117                  if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE              for (r = recip; r; r = r->next) {
118                      || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {                  get_pubkey (r->keyid, &key);
119                      HWND hwnd;                  if (key) {
120                      hide ^= 1;                      gpgme_user_id_t u = key->uids;
121                      hwnd = GetDlgItem( dlg, item_ctrl_id( c->gpg_cmd ) );  
122                      SendMessage( hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0 );                      id = u->name;
123                      SetFocus( hwnd );                      if (!id)
124                  }                          id = _("Invalid User ID");
125              }                      n = 32+strlen (id)+1+4+strlen (r->keyid)+1;
126                        if (u->email)
127              switch (LOWORD (wparam)) {                          n += strlen (u->email)+1;
128              case IDOK:                        info = new char [n+1];
129                  /* fixme: the item is even cached when the passphrase is not                      if (!info)
130                            correct, which means that the user needs to delete all                          BUG (NULL);
131                            cached entries to continue. */                      if (!u->email || strlen (u->email) < 1)
132                  GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, sizeof (c->pwd) -1);                          sprintf (info, "%s (%s, 0x%s)", id,
133                  if (reg_prefs.cache_time > 0 && !c->is_card && !strstr (c->keyid, "missing")) {                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
134                      if (agent_get_cache (c->keyid, &item))                      else
135                          agent_unlock_cache_entry (&item);                          sprintf (info, "%s <%s> (%s, 0x%s)", id, u->email,
136                      else                                   get_key_pubalgo (r->pubkey_algo), r->keyid+8);
137                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);                  }
138                  }                  else {
139                  EndDialog (dlg, TRUE);                      info = new char [32 + strlen (r->keyid)+1 + 4];
140                  return TRUE;                      if (!info)
141                                            BUG (NULL);
142              case IDCANCEL:                      sprintf (info, _("Unknown key ID (%s, 0x%s)"),
143                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );                               get_key_pubalgo (r->pubkey_algo), r->keyid+8);
144                  c->cancel = 1;                  }
145                  EndDialog (dlg, FALSE);                  ListBox_AddString_utf8 (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
146                  return FALSE;                  free_if_alloc (info);
147              }              }
148              break;          }
149      }          else if (c->gpg_cmd == GPG_CMD_DECRYPT)
150                    EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
151      return FALSE;          SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
152  } /* passphrase_callback_proc */                          IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
153                            c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
154                            _("Please enter your passphrase"));
155  static const char *          if (c->gpg_cmd == GPG_CMD_DECRYPT) {
156  parse_gpg_keyid( const char * desc )              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
157  {              if (res && !res->recipients) {
158      static char keyid[16+1];                  const char *s = _("Symmetric encryption.\n"
159      char * p;                                    "%s encrypted data.");
160                        const char *alg = get_symkey_algo (c->sym.sym_algo);
161      p = strrchr( desc, '\n' );                  info = new char[strlen (s) + strlen (alg) + 2];
162      if( !p )                  if (!info)
163          return NULL;                      BUG (NULL);
164      /* the format of the desc buffer looks like this:                  sprintf (info, s, alg);
165         request_keyid[16] main_keyid[16] keytype[1] keylength[4]                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
166         we use the main keyid to use only one cache entry. */                  free_if_alloc (info);
167      strncpy( keyid, desc+(p-desc+1+17), 16 );              }
168      return keyid;              else
169  } /* parse_gpg_keyid */                  SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
170            }
171            else {
172  static void              SetFocus (GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
173  parse_gpg_description( char * desc, int size )              SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
174  {          }
175      char * buffer = NULL, ch, uid[128] = {0}, * uid2 = NULL;          center_window (dlg, NULL);
176      char usedkey[16+1] = {0}, mainkey[16+1] = {0};          SetForegroundWindow (dlg);
177      const char * buf;          return FALSE;
178      int i, algo, try_again = 0;  
179            case WM_SYSCOMMAND:
180      if( stristr( desc, "[User ID hint missing]" )              if (LOWORD (wparam) == SC_CLOSE) {
181          || stristr( desc, "[passphrase info missing]" ) ) {                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
182          _snprintf( desc, size-1,                  c->cancel = 1;
183                     _("You need a passphrase to unlock the secret key for\n"                  EndDialog (dlg, TRUE);
184                       "user: [UserID hint missing]\n"              }
185                       "      [passphrase info missing]\n") );              break;
186          return;  
187      }          case WM_COMMAND:
188                switch (HIWORD (wparam)) {
189      buffer = new char[size+1];              case BN_CLICKED:
190      if( !buffer )                  if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
191          BUG( NULL );                      || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
192      strcpy( buffer, desc );                      HWND hwnd;
193      buf = buffer;                      int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
194      if( strstr( buf, "TRY_AGAIN" ) ) {                      hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
195          buf += strlen( "TRY_AGAIN\n" );                      SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
196          try_again = 1;                      SetFocus (hwnd);
197      }                  }
198      else if( strstr( buf, "ENTER_PASSPHRASE" ) )              }
199          buf += strlen( "ENTER_PASSPHRASE\n" );  
200      else              switch (LOWORD (wparam)) {
201          BUG( NULL );              case IDOK:  
202      buf += 17;                  /* XXX: the item is even cached when the passphrase is not
203      for( i = 0; i < sizeof uid-1; i++ ) {                          correct, which means that the user needs to delete all
204          ch = *buf++;                          cached entries to continue. */
205          if( ch == '\n' ) {                  if (c->pwd)
206              uid[i] = '\0';                      burn_passphrase (&c->pwd);
207              break;                  n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
208          }                  if (!n) {
209          uid[i] = ch;                      c->pwd = new char[2];
210      }                      if (!c->pwd)
211      memcpy( usedkey, buf, 16 );                          BUG (NULL);
212      usedkey[16] = '\0';                      strcpy (c->pwd, "");
213      buf += 17;                  }
214      memcpy( mainkey, buf, 16 );                  else {
215      mainkey[16] = '\0';                      c->pwd = new char[n+2];
216      buf += 17;                      if (!c->pwd)
217      if( !buf )                          BUG (NULL);
218          BUG( NULL );                      SafeGetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd),
219      algo = atol( buf );                                          c->pwd, n+1);
220      free_if_alloc( buffer );                  }
221                    res = gpgme_op_decrypt_result (c->gpg);
222      uid2 = utf8_to_wincp (uid, strlen (uid));                  if (!res)
223                        res_sig = gpgme_op_sign_result (c->gpg);            
224      if( strcmp( usedkey, mainkey ) )                  if (reg_prefs.cache_time > 0 && !c->is_card &&
225          _snprintf( desc, size-1,                      (res || res_sig)) {
226                     _("You need a passphrase to unlock the secret key for\n"                      if (agent_get_cache (c->keyid, &item))                      
227                       "user: \"%s\"\n"                          agent_unlock_cache_entry (&item);
228                       "%s key, ID %s (main key ID %s)\n"),                      else
229                     uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),                          agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
230                     usedkey+8, mainkey+8 );                  }
231      else if( !strcmp( usedkey, mainkey ) )                  c->cancel = 0;
232          _snprintf( desc, size-1,                  EndDialog (dlg, TRUE);
233                     _("You need a passphrase to unlock the secret key for\n"                  return TRUE;
234                       "user: \"%s\"\n"                  
235                       "%s key, ID %s\n"),              case IDCANCEL:
236                       uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),                  SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
237                       usedkey+8 );                  c->cancel = 1;
238      free( uid2 );                  EndDialog (dlg, FALSE);
239  } /* parse_gpg_describtion */                  return FALSE;
240                }
241                break;
242  static int inline      }
243  is_hexstring( const char * p )      
244  {      return FALSE;
245      size_t i;  }
246      for( i=0; i < strlen( p ); i++ ) {  
247          if( !isxdigit( p[i] ) )  
248              return -1;  /* Extract the main keyid from @pass_info.
249      }     Return value: long main keyid or NULL for an error. */
250      return 0;  static const char*
251  }  parse_gpg_keyid (const char *pass_info)
252    {
253        static char keyid[16+1];
254  const char *      
255  passphrase_cb( void * opaque, const char * desc, void * r_hd )      /* XXX: check for leading alpha-chars? */
256  {        if (strlen (pass_info) < 16) {
257      passphrase_cb_s * c = (passphrase_cb_s *)opaque;          log_debug ("parse_gpg_keyid: error '%s'\r\n", pass_info);
258      void * item;          return NULL;
259      const char * pass, * keyid;      }
260      int rc = 0;      /* the format of the desc buffer looks like this:
261           request_keyid[16] main_keyid[16] keytype[1] keylength[4]
262      if( !c )         we use the main keyid to use only one cache entry. */
263          return NULL;      strncpy (keyid, pass_info+17, 16);
264        keyid[16] = 0;
265      if( desc ) {      return keyid;
266          keyid = parse_gpg_keyid( desc );  }
267          pass = agent_get_cache( keyid, &item );  
268          if( pass ) {  
269              agent_unlock_cache_entry( &item );  /* Parse the information in @uid_hint and @pass_info to generate
270              c->pwd_init = 0;     a input message for the user in @desc. */
271              return pass;  static int
272          }  parse_gpg_description (const char *uid_hint, const char *pass_info,
273      }                         char *desc, int size)
274    {
275      if( c->pwd_init ) {      gpgme_pubkey_algo_t algo;
276          c->keyid = keyid;      char usedkey[16+1];
277          /* if the desc has a length of 32 and only hex digits, we assume a      char mainkey[16+1];
278             smart card has been used. */      char *p, *uid;
279          /*log_box( "", 0, "%s %d %d", desc,strlen( desc), is_hexstring( desc ) );*/      int n=0;
280          if( desc && strlen( desc ) == 32 && !is_hexstring( desc ) ) {  
281              char buf[16];      algo = (gpgme_pubkey_algo_t)0;
282              memset( buf, 0, sizeof buf );      /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
283              strncpy( buf, desc+20, 8 );      if (strlen (uid_hint) < 17) {
284              _snprintf( c->info, sizeof c->info-1,          *desc = 0;
285                      _("Please enter the PIN to unlock your secret card key\n"          log_debug ("parse_gpg_description: error '%s'\r\n", uid_hint);
286                        "Card: %s"), buf );          return -1;
287              c->is_card = 1;      }
288          }  
289          else if( desc ) {      while (p = strsep ((char**)&pass_info, " ")) {
290              strcpy( c->info, desc );          switch (n++) {
291              parse_gpg_description( c->info, sizeof c->info - 1 );          case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
292          }          case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
293          if( c->gpg_cmd == GPG_CMD_DECRYPT ) {          case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
294              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,          }
295                                  (HWND)c->hwnd, passphrase_callback_proc,      }
296                                  (LPARAM)c );      uid_hint += 16; /* skip keyid */
297          }      uid_hint += 1;  /* space */
298          else if( c->gpg_cmd == GPG_CMD_SIGN ) {  
299              rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,      uid = utf8_to_native (uid_hint);
300                                  (HWND)c->hwnd, passphrase_callback_proc,      if (strcmp (usedkey, mainkey))
301                                  (LPARAM)c );          _snprintf (desc, size-1,
302          }                     _("You need a passphrase to unlock the secret key for\n"
303          if( rc == -1 )                       "user: \"%s\"\n"
304              return NULL;                       "%s key, ID %s (main key ID %s)\n"),
305          c->pwd_init = 0;                     uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
306      }      else if (!strcmp (usedkey, mainkey))
307            _snprintf (desc, size-1,
308      if( c->cancel )                     _("You need a passphrase to unlock the secret key for\n"
309          return NULL;                       "user: \"%s\"\n"
310                         "%s key, ID %s\n"),
311      return c->pwd;                       uid, get_key_pubalgo (algo), usedkey+8);
312  } /* passphrase_cb */      safe_free (uid);
313        return 0;
314    }
315  void  
316  set_gpg_passphrase_cb( gpgme_ctx_t c, passphrase_cb_s * ctx, int cmd,  
317                         HWND hwnd, const char * title )  /* Extract the serial number from the card ID @id and return it. */
318  {  const char*
319      ctx->gpg_cmd = cmd;  extract_serial_no (const char *id)
320      ctx->is_card = 0;  {
321      ctx->cancel = 0;      static char buf[8];
322      ctx->hwnd = hwnd;      char *p;
323      ctx->pwd_init = 1;  
324      if( strlen( title ) > 256 )      p = strchr (id, '/');
325          BUG( NULL ); /* check bounds */      if (!p) {
326      strcpy( ctx->title, title );          log_debug ("extract_serial_no: error '%s'\r\n", id);
327      gpgme_set_passphrase_cb( c, passphrase_cb, ctx );          return NULL;
328  } /* set_gpg_passphrase_cb */      }
329        strncpy (buf, id+(p-id)-6, 6);
330        return buf;
331    }
332    
333    
334    /* Passphrase callback with the ability to support caching. */
335    gpgme_error_t
336    passphrase_cb (void *hook, const char *uid_hint,
337                   const char *passphrase_info,
338                   int prev_was_bad, int fd)
339    {
340        passphrase_cb_s *c = (passphrase_cb_s*)hook;
341        HANDLE hd = (HANDLE)fd;
342        void *item;
343        const char *keyid=NULL, *pass;
344        DWORD n;
345        int rc = 0;
346    
347        if (!c) {
348            log_debug ("passphrase_cb: error '!c'\r\n");
349            return gpg_error (GPG_ERR_INV_ARG);
350        }
351        c->bad_pwd = prev_was_bad? 1 : 0;
352        if (prev_was_bad && !c->cancel) {
353            if (c->pwd)
354                burn_passphrase (&c->pwd);
355            agent_del_cache (c->keyid);
356            c->pwd_init = 1;
357        }
358    
359        if (passphrase_info) {
360            if (strlen (passphrase_info) < 16 &&
361                !strstr (passphrase_info, "OPENPGP")) {
362                /* assume symetric encryption. */
363                int pos=2;
364                c->sym.sym_algo = atoi (passphrase_info);
365                if (c->sym.sym_algo > 9)
366                    pos++;
367                /* XXX: be more strict. */
368                c->sym.s2k_mode = atoi (passphrase_info+pos);
369                c->sym.s2k_hash = atoi (passphrase_info+pos+2);
370            }
371    
372            keyid = parse_gpg_keyid (passphrase_info);
373            pass = agent_get_cache (keyid+8, &item);        
374            if (pass) {
375                agent_unlock_cache_entry (&item);
376                c->pwd_init = 0;
377                if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
378                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
379                if (!WriteFile (hd, "\n", 1, &n, NULL))
380                    log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
381                return 0;
382            }
383        }
384    
385        if (c->pwd_init) {
386            if (keyid && strlen (keyid) == 16)
387                strcpy (c->keyid, keyid+8);
388    
389            /* if @passphrase_info contains 'OPENPGP' we assume a smart card
390                has been used. */
391            if (strstr (passphrase_info, "OPENPGP")) {
392                const char *s=passphrase_info;
393                while (s && *s && *s != 'D')
394                    s++;
395                _snprintf (c->info, sizeof c->info-1,
396                           _("Please enter the PIN to unlock your secret card key\n"
397                             "Card: %s"), extract_serial_no (s));
398                c->is_card = 1;
399            }
400            else if (uid_hint)
401                parse_gpg_description (uid_hint, passphrase_info,
402                                       c->info, sizeof (c->info) - 1);
403            if (c->gpg_cmd == GPG_CMD_DECRYPT) {
404                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
405                                     (HWND)c->hwnd, passphrase_callback_proc,
406                                     (LPARAM)c);
407            }
408            else if (c->gpg_cmd == GPG_CMD_SIGN) {
409                rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
410                                     (HWND)c->hwnd, passphrase_callback_proc,
411                                     (LPARAM)c);
412            }
413            if (rc == -1) {
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            c->pwd_init = 0;
419        }
420        if (c->cancel || !c->pwd) {
421            if (!WriteFile (hd, "\n", 1, &n, NULL))
422                log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
423            return 0;
424        }
425    
426        if (!WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL))
427            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
428        if (!WriteFile (hd, "\n", 1, &n, NULL))
429            log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
430        return 0;
431    }
432    
433    
434    /* Initialize the given passphrase callback @cb with the
435       used gpgme context @ctx, the command @cmd and a title
436       @title for the dialog. */
437    void
438    set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
439                           int cmd, HWND hwnd, const char *title)
440    {
441        memset (cb, 0, sizeof *cb);
442        cb->gpg_cmd = cmd;
443        cb->bad_pwd = 0;
444        cb->is_card = 0;
445        cb->cancel = 0;
446        cb->hwnd = hwnd;
447        cb->pwd_init = 1;
448        free_if_alloc (cb->title);
449        cb->title = m_strdup (title);
450        gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
451        cb->gpg = ctx;
452    }
453    
454    
455    /* Release the gpg recipient list. */
456    void
457    release_gpg_recipients (gpgme_recipient_t *recipients)
458    {
459        gpgme_recipient_t r, n;
460    
461        r = *recipients;
462        while (r != NULL) {
463            n = r->next;
464            safe_free (r->keyid);
465            safe_free (r);
466            r = n;
467        }
468        *recipients = NULL;
469    }
470    
471    
472    
473    /* Release a passphrase callback @ctx. */
474    void
475    release_gpg_passphrase_cb (passphrase_cb_s *ctx)
476    {
477        if (!ctx)
478            return;
479        sfree_if_alloc (ctx->pwd);
480        free_if_alloc (ctx->title);
481        release_gpg_recipients (&ctx->recipients);
482    }
483    
484    
485    /* Simple check to measure passphrase (@pass) quality.
486       Return value: 0 on success. */
487    int
488    check_passwd_quality (const char *pass, int strict)
489    {
490        int i, nd=0, nc=0, n;
491    
492        n = strlen (pass);
493        if (n < 8)
494            return -1;
495    
496        for (i=0; i < n; i++) {
497            if (isdigit (pass[i]))
498                nd++;
499            if (isalpha (pass[i]))
500                nc++;
501        }
502    
503        /* check that the passphrase contains letters and numbers. */
504        if (nd == n || nc == n)
505            return -1;
506    
507        return 0;
508    }
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