| 1 |
/* OEPassphraseDLG.cpp - GPGME Passphrase Callback |
| 2 |
* Copyright (C) 2001, 2002, 2006 Timo Schulz |
| 3 |
* |
| 4 |
* This file is part of GPGOE. |
| 5 |
* |
| 6 |
* GPGOE is free software; you can redistribute it and/or modify |
| 7 |
* it under the terms of the GNU Lesser General Public License as published by |
| 8 |
* the Free Software Foundation; either version 2.1 of the License, or |
| 9 |
* (at your option) any later version. |
| 10 |
* |
| 11 |
* GPGOE is distributed in the hope that it will be useful, |
| 12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
* GNU General Public License for more details. |
| 15 |
* |
| 16 |
* You should have received a copy of the GNU Lesser General Public License |
| 17 |
* along with GPGOE; if not, write to the Free Software Foundation, |
| 18 |
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA7 USA |
| 19 |
*/ |
| 20 |
|
| 21 |
#ifdef HAVE_CONFIG_H |
| 22 |
#include <config.h> |
| 23 |
#endif |
| 24 |
#include <windows.h> |
| 25 |
#include <assert.h> |
| 26 |
#include "resource.h" |
| 27 |
#include "gpgme.h" |
| 28 |
#include "GPGOE.h" |
| 29 |
|
| 30 |
|
| 31 |
/* Structure for the passphrase cache. */ |
| 32 |
struct pass_cache_s { |
| 33 |
struct pass_cache_s *next; |
| 34 |
char *keyid; |
| 35 |
char *pass; |
| 36 |
}; |
| 37 |
typedef struct pass_cache_s *pass_cache_t; |
| 38 |
|
| 39 |
/* Structure for the passphrase callback. */ |
| 40 |
struct pass_cb_s { |
| 41 |
const char *uid_hint; |
| 42 |
const char *passphrase_info; |
| 43 |
char keyid[8+2]; |
| 44 |
char *pass; |
| 45 |
pass_cache_t cache; |
| 46 |
HWND main_wnd; |
| 47 |
int cancel; |
| 48 |
int prev_was_bad; |
| 49 |
}; |
| 50 |
|
| 51 |
|
| 52 |
/* Global passphrase cache. */ |
| 53 |
static pass_cache_t the_cache = NULL; |
| 54 |
|
| 55 |
|
| 56 |
/* Release the passphrase cache @ctx and invalidate all passphrases. */ |
| 57 |
static void |
| 58 |
invalidate_cache (pass_cache_t ctx) |
| 59 |
{ |
| 60 |
pass_cache_t c; |
| 61 |
|
| 62 |
while (ctx) { |
| 63 |
c = ctx->next; |
| 64 |
free_if_alloc (ctx->keyid); |
| 65 |
wipememory (ctx->pass, strlen (ctx->pass)); |
| 66 |
free_if_alloc (ctx->pass); |
| 67 |
ctx = c; |
| 68 |
} |
| 69 |
} |
| 70 |
|
| 71 |
/* Put the passphrase @pass into the passphrase cache @ctx. */ |
| 72 |
static void |
| 73 |
passphrase_put (pass_cache_t *ctx, const char *keyid, const char *pass) |
| 74 |
{ |
| 75 |
pass_cache_t c, n; |
| 76 |
|
| 77 |
/* check if the item is already present. */ |
| 78 |
for (n = *ctx; n; n = n->next) { |
| 79 |
if (!strcmp (n->keyid, keyid)) |
| 80 |
return; |
| 81 |
} |
| 82 |
|
| 83 |
c = xcalloc (1, sizeof *c); |
| 84 |
c->keyid = xstrdup (keyid); |
| 85 |
c->pass = xstrdup (pass); |
| 86 |
|
| 87 |
if (!*ctx) |
| 88 |
*ctx = c; |
| 89 |
else { |
| 90 |
for (n = *ctx; n->next; n = n->next) |
| 91 |
; |
| 92 |
n->next = c; |
| 93 |
} |
| 94 |
} |
| 95 |
|
| 96 |
|
| 97 |
/* Return the passphrase for the key with the keyid @keyid |
| 98 |
or NULL if the passphrase was not cached for this key. */ |
| 99 |
static const char* |
| 100 |
passphrase_get (pass_cache_t ctx, const char *keyid) |
| 101 |
{ |
| 102 |
pass_cache_t c; |
| 103 |
|
| 104 |
for (c = ctx; c; c = c->next) { |
| 105 |
if (!strcmp (c->keyid, keyid)) |
| 106 |
return c->pass; |
| 107 |
} |
| 108 |
return NULL; |
| 109 |
} |
| 110 |
|
| 111 |
|
| 112 |
|
| 113 |
|
| 114 |
/* Extract public key algorithm from passwd info. */ |
| 115 |
const char* |
| 116 |
get_pubkey_algo (const char *passphrase_info) |
| 117 |
{ |
| 118 |
size_t pos = 16+1+16+1; |
| 119 |
|
| 120 |
/* AA6F7AB7DD3B4A21 E71D9BC8C93A8529 1 0 */ |
| 121 |
assert (strlen (passphrase_info) > pos); |
| 122 |
switch (atol (passphrase_info+pos)) { |
| 123 |
case 1: return "RSA"; |
| 124 |
case 17: return "DSA"; |
| 125 |
case 16: return "ELG"; |
| 126 |
} |
| 127 |
return "???"; |
| 128 |
} |
| 129 |
|
| 130 |
|
| 131 |
/* Passphrase callback dialog box procedure. */ |
| 132 |
BOOL CALLBACK |
| 133 |
pass_cb_dlg_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam) |
| 134 |
{ |
| 135 |
static pass_cb_t ctx; |
| 136 |
char *info; |
| 137 |
int n; |
| 138 |
|
| 139 |
switch (msg) { |
| 140 |
case WM_INITDIALOG: |
| 141 |
ctx = (pass_cb_t)lparam; |
| 142 |
assert (ctx); |
| 143 |
if (ctx->uid_hint && ctx->passphrase_info) { |
| 144 |
char *utf8_uid = utf8_to_native (ctx->uid_hint+17); |
| 145 |
info = xcalloc (1, strlen (utf8_uid) + strlen (ctx->keyid) + 32); |
| 146 |
sprintf (info, _("%s\n%s key, ID %s"), utf8_uid, |
| 147 |
get_pubkey_algo (ctx->passphrase_info), ctx->keyid); |
| 148 |
SetDlgItemText (dlg, IDC_DECRYPT_MSG, info); |
| 149 |
free_if_alloc (utf8_uid); |
| 150 |
free_if_alloc (info); |
| 151 |
} |
| 152 |
SetDlgItemText (dlg, IDOK, _("&OK")); |
| 153 |
SetDlgItemText (dlg, IDCANCEL, _("&Cancel")); |
| 154 |
SetDlgItemText (dlg, IDC_DECRYPT_PWDINFO, _("Please enter your passphrase")); |
| 155 |
SendDlgItemMessage (dlg, IDC_DECRYPT_PWD, EM_SETPASSWORDCHAR, |
| 156 |
(WPARAM)(UINT)'*', 0); |
| 157 |
CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED); |
| 158 |
SetDlgItemText (dlg, IDC_DECRYPT_HIDE, _("&Hide typing")); |
| 159 |
SetWindowText (dlg, _("Decryption")); |
| 160 |
SetForegroundWindow (dlg); |
| 161 |
center_window (dlg, ctx->main_wnd); |
| 162 |
break; |
| 163 |
|
| 164 |
case WM_COMMAND: |
| 165 |
if (HIWORD (wparam) == BN_CLICKED && |
| 166 |
LOWORD (wparam) == IDC_DECRYPT_HIDE) { |
| 167 |
HWND hwnd; |
| 168 |
hwnd = GetDlgItem (dlg, IDC_DECRYPT_PWD); |
| 169 |
SendMessage (hwnd, EM_SETPASSWORDCHAR, |
| 170 |
IsDlgButtonChecked (dlg, IDC_DECRYPT_HIDE)? '*' : 0, 0); |
| 171 |
SetFocus (hwnd); |
| 172 |
break; |
| 173 |
} |
| 174 |
|
| 175 |
switch (LOWORD (wparam)) { |
| 176 |
case IDCANCEL: |
| 177 |
ctx->cancel = 1; |
| 178 |
free_if_alloc (ctx->pass); |
| 179 |
EndDialog (dlg, FALSE); |
| 180 |
break; |
| 181 |
|
| 182 |
case IDOK: |
| 183 |
if (ctx->prev_was_bad) |
| 184 |
SetDlgItemText (dlg, IDC_DECRYPT_PWDINFO, |
| 185 |
_("Invalid passphrase; please enter your passphrase again")); |
| 186 |
else |
| 187 |
SetDlgItemText (dlg, IDC_DECRYPT_PWDINFO, |
| 188 |
_("Please enter your passphrase")); |
| 189 |
n = SendDlgItemMessage (dlg, IDC_DECRYPT_PWD, |
| 190 |
WM_GETTEXTLENGTH, 0, 0); |
| 191 |
if (n < 1) { |
| 192 |
MessageBox (dlg, _("Please enter your passphrase"), |
| 193 |
_("GPG Plug-in Info"), MB_ICONINFORMATION|MB_OK); |
| 194 |
return FALSE; |
| 195 |
} |
| 196 |
ctx->cancel = 0; |
| 197 |
ctx->pass = xcalloc (1, n+2); |
| 198 |
GetDlgItemText (dlg, IDC_DECRYPT_PWD, ctx->pass, n+1); |
| 199 |
|
| 200 |
/*passphrase_put (&the_cache, ctx->keyid, ctx->pass);*/ |
| 201 |
EndDialog (dlg, TRUE); |
| 202 |
break; |
| 203 |
} |
| 204 |
break; |
| 205 |
} |
| 206 |
return FALSE; |
| 207 |
} |
| 208 |
|
| 209 |
|
| 210 |
/* GPGME compatible passphrase callback. */ |
| 211 |
gpgme_error_t |
| 212 |
passphrase_cb (void *hook, |
| 213 |
const char *uid_hint, |
| 214 |
const char *passphrase_info, |
| 215 |
int prev_was_bad, int fd) |
| 216 |
{ |
| 217 |
pass_cb_t cb = (pass_cb_t)hook; |
| 218 |
HANDLE fp = (HANDLE)fd; |
| 219 |
const char *pass; |
| 220 |
DWORD nwritten = 0; |
| 221 |
|
| 222 |
cb->prev_was_bad = prev_was_bad; |
| 223 |
if (prev_was_bad && !cb->cancel) { |
| 224 |
wipememory (cb->pass, strlen (cb->pass)); |
| 225 |
free_if_alloc (cb->pass); |
| 226 |
} |
| 227 |
if (!cb->pass && !cb->cancel) { |
| 228 |
cb->uid_hint = uid_hint; |
| 229 |
cb->passphrase_info = passphrase_info; |
| 230 |
memset (cb->keyid, 0, sizeof (cb->keyid)); |
| 231 |
memcpy (cb->keyid, cb->passphrase_info+8, 8); |
| 232 |
|
| 233 |
if (the_cache && (pass=passphrase_get (the_cache, cb->keyid))) |
| 234 |
cb->pass = xstrdup (pass); |
| 235 |
else |
| 236 |
DialogBoxParam (mod_hinst_dll, (LPCTSTR)IDD_DECRYPT, |
| 237 |
cb->main_wnd, pass_cb_dlg_proc, (LPARAM)cb); |
| 238 |
} |
| 239 |
if (cb->cancel) |
| 240 |
WriteFile (fp, "\n", 1, &nwritten, NULL); |
| 241 |
else if (cb->pass != NULL) { |
| 242 |
WriteFile (fp, cb->pass, strlen (cb->pass), &nwritten, NULL); |
| 243 |
WriteFile (fp, "\n", 1, &nwritten, NULL); |
| 244 |
} |
| 245 |
return 0; |
| 246 |
} |
| 247 |
|
| 248 |
|
| 249 |
/* Allocate new passphrase callback context. */ |
| 250 |
pass_cb_t |
| 251 |
new_pass_cb (HWND main) |
| 252 |
{ |
| 253 |
pass_cb_t cb_val; |
| 254 |
|
| 255 |
cb_val = xcalloc (1, sizeof *cb_val); |
| 256 |
cb_val->main_wnd = main; |
| 257 |
return cb_val; |
| 258 |
} |
| 259 |
|
| 260 |
|
| 261 |
|
| 262 |
/* Free passphrase callback context. */ |
| 263 |
void |
| 264 |
free_pass_cb (pass_cb_t cb) |
| 265 |
{ |
| 266 |
if (!cb) |
| 267 |
return; |
| 268 |
if (cb->pass) { |
| 269 |
wipememory (cb->pass, strlen (cb->pass)); |
| 270 |
free_if_alloc (cb->pass); |
| 271 |
} |
| 272 |
free_if_alloc (cb); |
| 273 |
} |
| 274 |
|
| 275 |
|
| 276 |
int |
| 277 |
pass_cb_cancelled (pass_cb_t cb) |
| 278 |
{ |
| 279 |
return cb->cancel; |
| 280 |
} |
| 281 |
|
| 282 |
|
| 283 |
/* Release the passphrase cache. */ |
| 284 |
void |
| 285 |
free_pass_cache (void) |
| 286 |
{ |
| 287 |
invalidate_cache (the_cache); |
| 288 |
the_cache = NULL; |
| 289 |
} |
Parent Directory
| 
Revision Log