| 1 |
/* wptPassphraseCB.cpp - GPGME Passphrase Callback |
| 2 |
* Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz |
| 3 |
* Copyright (C) 2005 g10 Code GmbH |
| 4 |
* |
| 5 |
* This file is part of WinPT. |
| 6 |
* |
| 7 |
* WinPT is free software; you can redistribute it and/or |
| 8 |
* modify it under the terms of the GNU General Public License |
| 9 |
* as published by the Free Software Foundation; either version 2 |
| 10 |
* of the License, or (at your option) any later version. |
| 11 |
* |
| 12 |
* WinPT is distributed in the hope that it will be useful, |
| 13 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 |
* General Public License for more details. |
| 16 |
* |
| 17 |
* You should have received a copy of the GNU General Public License |
| 18 |
* 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 |
|
| 22 |
#ifdef HAVE_CONFIG_H |
| 23 |
#include <config.h> |
| 24 |
#endif |
| 25 |
|
| 26 |
#include <windows.h> |
| 27 |
#include <windows.h> |
| 28 |
#include <ctype.h> |
| 29 |
|
| 30 |
#include "resource.h" |
| 31 |
#include "wptNLS.h" |
| 32 |
#include "wptW32API.h" |
| 33 |
#include "wptVersion.h" |
| 34 |
#include "wptGPG.h" |
| 35 |
#include "wptCommonCtl.h" |
| 36 |
#include "wptContext.h" |
| 37 |
#include "wptDlgs.h" |
| 38 |
#include "wptUTF8.h" |
| 39 |
#include "wptErrors.h" |
| 40 |
#include "wptTypes.h" |
| 41 |
#include "wptKeyList.h" |
| 42 |
#include "wptAgent.h" |
| 43 |
#include "wptRegistry.h" |
| 44 |
|
| 45 |
const char* get_symkey_algo (int algo); |
| 46 |
|
| 47 |
#define item_ctrl_id( cmd ) \ |
| 48 |
((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD) |
| 49 |
|
| 50 |
#define item_ctrl_id2(cmd) \ |
| 51 |
((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE) |
| 52 |
|
| 53 |
|
| 54 |
/* Overwrite passphrase and free memory. */ |
| 55 |
static void |
| 56 |
burn_passphrase (char **pwd) |
| 57 |
{ |
| 58 |
char *pass = *pwd; |
| 59 |
wipememory (pass, strlen (pass)); |
| 60 |
delete []pass; |
| 61 |
*pwd = NULL; |
| 62 |
} |
| 63 |
|
| 64 |
|
| 65 |
/* Dialog procedure for the passphrase callback. */ |
| 66 |
static BOOL CALLBACK |
| 67 |
passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam) |
| 68 |
{ |
| 69 |
static passphrase_cb_s * c; |
| 70 |
gpgme_decrypt_result_t res; |
| 71 |
gpgme_sign_result_t res_sig; |
| 72 |
gpgme_key_t key; |
| 73 |
gpgme_recipient_t recip, r; |
| 74 |
void *ctx = NULL, *item; |
| 75 |
const char *id; |
| 76 |
char *info; |
| 77 |
int n; |
| 78 |
|
| 79 |
switch (msg) { |
| 80 |
case WM_INITDIALOG: |
| 81 |
c = (passphrase_cb_s *)lparam; |
| 82 |
if (!c) |
| 83 |
BUG (0); |
| 84 |
SetWindowText (dlg, c->title); |
| 85 |
if (c->gpg_cmd == GPG_CMD_DECRYPT) { |
| 86 |
SetDlgItemText (dlg, IDC_DECRYPT_LISTINF, |
| 87 |
_("Encrypted with the following public key(s)")); |
| 88 |
CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED); |
| 89 |
} |
| 90 |
else if (c->gpg_cmd == GPG_CMD_SIGN) |
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CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED); |
| 92 |
if (c->recipients) |
| 93 |
recip = c->recipients; /* recipients were already extracted. */ |
| 94 |
else { |
| 95 |
/* XXX: not all ENCRYPT_TO entries are listed here. */ |
| 96 |
res = gpgme_op_decrypt_result (c->gpg); |
| 97 |
if (res && res->recipients) |
| 98 |
recip = res->recipients; |
| 99 |
} |
| 100 |
if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) { |
| 101 |
for (r = res->recipients; r; r = r->next) { |
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get_pubkey (r->keyid, &key); |
| 103 |
if (key) { |
| 104 |
char *uid; |
| 105 |
id = key->uids->name; |
| 106 |
if (!id) |
| 107 |
id = _("Invalid User ID"); |
| 108 |
uid = utf8_to_wincp (id, strlen (id)); |
| 109 |
info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1 |
| 110 |
+ strlen (key->uids->email)+1]; |
| 111 |
if (!info) |
| 112 |
BUG (NULL); |
| 113 |
sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email, |
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get_key_pubalgo (r->pubkey_algo), r->keyid+8); |
| 115 |
free (uid); |
| 116 |
|
| 117 |
} |
| 118 |
else { |
| 119 |
info = new char [32 + strlen (r->keyid)+1 + 4]; |
| 120 |
if (!info) |
| 121 |
BUG (NULL); |
| 122 |
sprintf (info, _("Unknown key ID (%s, 0x%s)"), |
| 123 |
get_key_pubalgo (r->pubkey_algo), r->keyid+8); |
| 124 |
} |
| 125 |
listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info); |
| 126 |
free_if_alloc (info); |
| 127 |
} |
| 128 |
} |
| 129 |
else if (c->gpg_cmd == GPG_CMD_DECRYPT) |
| 130 |
EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE); |
| 131 |
SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT? |
| 132 |
IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO, |
| 133 |
c->bad_pwd? _("Bad passphrase; Enter passphrase again") : |
| 134 |
_("Please enter your passphrase")); |
| 135 |
if (c->gpg_cmd == GPG_CMD_DECRYPT) { |
| 136 |
SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD)); |
| 137 |
if (res && !res->recipients) { |
| 138 |
const char *s = _("Symmetric encryption.\n" |
| 139 |
"%s encrypted data."); |
| 140 |
const char *alg = get_symkey_algo (c->sym.sym_algo); |
| 141 |
info = new char[strlen (s) + strlen (alg) + 2]; |
| 142 |
if (!info) |
| 143 |
BUG (NULL); |
| 144 |
sprintf (info, s, alg); |
| 145 |
SetDlgItemText (dlg, IDC_DECRYPT_MSG, info); |
| 146 |
free_if_alloc (info); |
| 147 |
} |
| 148 |
else |
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SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info); |
| 150 |
} |
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else { |
| 152 |
SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD)); |
| 153 |
SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info); |
| 154 |
} |
| 155 |
center_window (dlg, NULL); |
| 156 |
SetForegroundWindow (dlg); |
| 157 |
set_active_window (dlg); |
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return FALSE; |
| 159 |
|
| 160 |
case WM_SYSCOMMAND: |
| 161 |
if (LOWORD (wparam) == SC_CLOSE) { |
| 162 |
SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), ""); |
| 163 |
c->cancel = 1; |
| 164 |
EndDialog (dlg, TRUE); |
| 165 |
} |
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break; |
| 167 |
|
| 168 |
case WM_COMMAND: |
| 169 |
switch (HIWORD (wparam)) { |
| 170 |
case BN_CLICKED: |
| 171 |
if (LOWORD (wparam) == IDC_DECRYPT_HIDE |
| 172 |
|| LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) { |
| 173 |
HWND hwnd; |
| 174 |
int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd)); |
| 175 |
hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd)); |
| 176 |
SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0); |
| 177 |
SetFocus (hwnd); |
| 178 |
} |
| 179 |
} |
| 180 |
|
| 181 |
switch (LOWORD (wparam)) { |
| 182 |
case IDOK: |
| 183 |
/* XXX: the item is even cached when the passphrase is not |
| 184 |
correct, which means that the user needs to delete all |
| 185 |
cached entries to continue. */ |
| 186 |
if (c->pwd) |
| 187 |
burn_passphrase (&c->pwd); |
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n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd)); |
| 189 |
if (!n) { |
| 190 |
c->pwd = new char[2]; |
| 191 |
if (!c->pwd) |
| 192 |
BUG (NULL); |
| 193 |
strcpy (c->pwd, ""); |
| 194 |
} |
| 195 |
else { |
| 196 |
c->pwd = new char[n+2]; |
| 197 |
if (!c->pwd) |
| 198 |
BUG (NULL); |
| 199 |
GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1); |
| 200 |
} |
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res = gpgme_op_decrypt_result (c->gpg); |
| 202 |
if (!res) |
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res_sig = gpgme_op_sign_result (c->gpg); |
| 204 |
if (reg_prefs.cache_time > 0 && !c->is_card && |
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((res && res->recipients) || (res_sig && res_sig->signatures))) { |
| 206 |
if (agent_get_cache (c->keyid, &item)) |
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agent_unlock_cache_entry (&item); |
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else |
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agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time); |
| 210 |
} |
| 211 |
c->cancel = 0; |
| 212 |
EndDialog (dlg, TRUE); |
| 213 |
return TRUE; |
| 214 |
|
| 215 |
case IDCANCEL: |
| 216 |
SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), ""); |
| 217 |
c->cancel = 1; |
| 218 |
EndDialog (dlg, FALSE); |
| 219 |
return FALSE; |
| 220 |
} |
| 221 |
break; |
| 222 |
} |
| 223 |
|
| 224 |
return FALSE; |
| 225 |
} |
| 226 |
|
| 227 |
|
| 228 |
/* Extract the main keyid from @pass_info. |
| 229 |
Return value: long main keyid or NULL for an error. */ |
| 230 |
static const char* |
| 231 |
parse_gpg_keyid (const char *pass_info) |
| 232 |
{ |
| 233 |
static char keyid[16+1]; |
| 234 |
|
| 235 |
/* XXX: check for leading alpha-chars? */ |
| 236 |
if (strlen (pass_info) < 16) |
| 237 |
return NULL; |
| 238 |
/* the format of the desc buffer looks like this: |
| 239 |
request_keyid[16] main_keyid[16] keytype[1] keylength[4] |
| 240 |
we use the main keyid to use only one cache entry. */ |
| 241 |
strncpy (keyid, pass_info+17, 16); |
| 242 |
keyid[16] = 0; |
| 243 |
return keyid; |
| 244 |
} |
| 245 |
|
| 246 |
|
| 247 |
/* Parse the information in @uid_hint and @pass_info to generate |
| 248 |
a input message for the user in @desc. */ |
| 249 |
static int |
| 250 |
parse_gpg_description (const char *uid_hint, const char *pass_info, |
| 251 |
char *desc, int size) |
| 252 |
{ |
| 253 |
gpgme_pubkey_algo_t algo; |
| 254 |
char usedkey[16+1]; |
| 255 |
char mainkey[16+1]; |
| 256 |
char *uid, *p; |
| 257 |
int n=0; |
| 258 |
|
| 259 |
/* Each uid_hint contains a long key-ID so it is at least 16 bytes. */ |
| 260 |
if (strlen (uid_hint) < 17) { |
| 261 |
*desc = 0; |
| 262 |
return -1; |
| 263 |
} |
| 264 |
|
| 265 |
while (p = strsep ((char**)&pass_info, " ")) { |
| 266 |
switch (n++) { |
| 267 |
case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break; |
| 268 |
case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break; |
| 269 |
case 2: algo = (gpgme_pubkey_algo_t)atol (p); break; |
| 270 |
} |
| 271 |
} |
| 272 |
uid_hint += 16; /* skip keyid */ |
| 273 |
uid_hint += 1; /* space */ |
| 274 |
|
| 275 |
uid = utf8_to_wincp (uid_hint, strlen (uid_hint)); |
| 276 |
|
| 277 |
if (strcmp (usedkey, mainkey)) |
| 278 |
_snprintf (desc, size-1, |
| 279 |
_("You need a passphrase to unlock the secret key for\n" |
| 280 |
"user: \"%s\"\n" |
| 281 |
"%s key, ID %s (main key ID %s)\n"), |
| 282 |
uid, get_key_pubalgo (algo), usedkey+8, mainkey+8); |
| 283 |
else if (!strcmp (usedkey, mainkey)) |
| 284 |
_snprintf (desc, size-1, |
| 285 |
_("You need a passphrase to unlock the secret key for\n" |
| 286 |
"user: \"%s\"\n" |
| 287 |
"%s key, ID %s\n"), |
| 288 |
uid, get_key_pubalgo (algo), usedkey+8); |
| 289 |
free (uid); |
| 290 |
return 0; |
| 291 |
} |
| 292 |
|
| 293 |
|
| 294 |
/* Extract the serial number from the card ID @id and return it. */ |
| 295 |
const char* |
| 296 |
extract_serial_no (const char *id) |
| 297 |
{ |
| 298 |
static char buf[8]; |
| 299 |
char *p; |
| 300 |
|
| 301 |
p = strchr (id, '/'); |
| 302 |
if (!p) |
| 303 |
return NULL; |
| 304 |
strncpy (buf, id+(p-id)-6, 6); |
| 305 |
return buf; |
| 306 |
} |
| 307 |
|
| 308 |
|
| 309 |
/* Passphrase callback with the ability to support caching. */ |
| 310 |
gpgme_error_t |
| 311 |
passphrase_cb (void *hook, const char *uid_hint, |
| 312 |
const char *passphrase_info, |
| 313 |
int prev_was_bad, int fd) |
| 314 |
{ |
| 315 |
passphrase_cb_s *c = (passphrase_cb_s*)hook; |
| 316 |
HANDLE hd = (HANDLE)fd; |
| 317 |
void *item; |
| 318 |
const char *keyid, *pass; |
| 319 |
DWORD n; |
| 320 |
int rc; |
| 321 |
|
| 322 |
if (!c) |
| 323 |
return gpg_error (GPG_ERR_INV_ARG); |
| 324 |
c->bad_pwd = prev_was_bad? 1 : 0; |
| 325 |
if (prev_was_bad && !c->cancel) { |
| 326 |
if (c->pwd) |
| 327 |
burn_passphrase (&c->pwd); |
| 328 |
agent_del_cache (c->keyid); |
| 329 |
c->pwd_init = 1; |
| 330 |
} |
| 331 |
|
| 332 |
if (passphrase_info) { |
| 333 |
if (strlen (passphrase_info) < 16 && |
| 334 |
!strstr (passphrase_info, "OPENPGP")) { |
| 335 |
/* assume symetric encryption. */ |
| 336 |
int n=2; |
| 337 |
c->sym.sym_algo = atoi (passphrase_info); |
| 338 |
if (c->sym.sym_algo > 9) |
| 339 |
n++; |
| 340 |
/* XXX: be more strict. */ |
| 341 |
c->sym.s2k_mode = atoi (passphrase_info+n); |
| 342 |
c->sym.s2k_hash = atoi (passphrase_info+n+2); |
| 343 |
} |
| 344 |
|
| 345 |
keyid = parse_gpg_keyid (passphrase_info); |
| 346 |
pass = agent_get_cache (keyid+8, &item); |
| 347 |
if (pass) { |
| 348 |
agent_unlock_cache_entry (&item); |
| 349 |
c->pwd_init = 0; |
| 350 |
if (!WriteFile (hd, pass, strlen (pass), &n, NULL)) |
| 351 |
log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno); |
| 352 |
if (!WriteFile (hd, "\n", 1, &n, NULL)) |
| 353 |
log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno); |
| 354 |
return 0; |
| 355 |
} |
| 356 |
} |
| 357 |
|
| 358 |
if (c->pwd_init) { |
| 359 |
if (keyid && strlen (keyid) == 16) |
| 360 |
strcpy (c->keyid, keyid+8); |
| 361 |
|
| 362 |
/* if @passphrase_info contains 'OPENPGP' we assume a smart card |
| 363 |
has been used. */ |
| 364 |
if (strstr (passphrase_info, "OPENPGP")) { |
| 365 |
const char *s=passphrase_info; |
| 366 |
while (s && *s && *s != 'D') |
| 367 |
s++; |
| 368 |
_snprintf (c->info, sizeof c->info-1, |
| 369 |
_("Please enter the PIN to unlock your secret card key\n" |
| 370 |
"Card: %s"), extract_serial_no (s)); |
| 371 |
c->is_card = 1; |
| 372 |
} |
| 373 |
else if (uid_hint) |
| 374 |
parse_gpg_description (uid_hint, passphrase_info, |
| 375 |
c->info, sizeof c->info - 1); |
| 376 |
if (c->gpg_cmd == GPG_CMD_DECRYPT) { |
| 377 |
rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT, |
| 378 |
(HWND)c->hwnd, passphrase_callback_proc, |
| 379 |
(LPARAM)c); |
| 380 |
} |
| 381 |
else if (c->gpg_cmd == GPG_CMD_SIGN) { |
| 382 |
rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN, |
| 383 |
(HWND)c->hwnd, passphrase_callback_proc, |
| 384 |
(LPARAM)c); |
| 385 |
} |
| 386 |
if (rc == -1) { |
| 387 |
if (!WriteFile (hd, "\n", 1, &n, NULL)) |
| 388 |
log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno); |
| 389 |
return 0; |
| 390 |
} |
| 391 |
c->pwd_init = 0; |
| 392 |
} |
| 393 |
if (c->cancel) { |
| 394 |
if (!WriteFile (hd, "\n", 1, &n, NULL)) |
| 395 |
log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno); |
| 396 |
return 0; |
| 397 |
} |
| 398 |
|
| 399 |
WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL); |
| 400 |
WriteFile (hd, "\n", 1, &n, NULL); |
| 401 |
return 0; |
| 402 |
} |
| 403 |
|
| 404 |
|
| 405 |
/* Initialize the given passphrase callback @cb with the |
| 406 |
used gpgme context @ctx, the command @cmd and a title |
| 407 |
@title for the dialog. */ |
| 408 |
void |
| 409 |
set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx, |
| 410 |
int cmd, HWND hwnd, const char *title) |
| 411 |
{ |
| 412 |
memset (cb, 0, sizeof *cb); |
| 413 |
cb->gpg_cmd = cmd; |
| 414 |
cb->bad_pwd = 0; |
| 415 |
cb->is_card = 0; |
| 416 |
cb->cancel = 0; |
| 417 |
cb->hwnd = hwnd; |
| 418 |
cb->pwd_init = 1; |
| 419 |
free_if_alloc (cb->title); |
| 420 |
cb->title = m_strdup (title); |
| 421 |
if (!cb->title) |
| 422 |
BUG (NULL); |
| 423 |
gpgme_set_passphrase_cb (ctx, passphrase_cb, cb); |
| 424 |
cb->gpg = ctx; |
| 425 |
} |
| 426 |
|
| 427 |
|
| 428 |
/* Release a passphrase callback @ctx. */ |
| 429 |
void |
| 430 |
release_gpg_passphrase_cb (passphrase_cb_s *ctx) |
| 431 |
{ |
| 432 |
gpgme_recipient_t r, n; |
| 433 |
|
| 434 |
if (!ctx) |
| 435 |
return; |
| 436 |
sfree_if_alloc (ctx->pwd); |
| 437 |
free_if_alloc (ctx->title); |
| 438 |
r = ctx->recipients; |
| 439 |
while (r) { |
| 440 |
n = r->next; |
| 441 |
safe_free (r->keyid); |
| 442 |
safe_free (r); |
| 443 |
r = n; |
| 444 |
} |
| 445 |
} |
| 446 |
|
| 447 |
|
| 448 |
/* Simple check to measure passphrase (@pass) quality. |
| 449 |
Return value: 0 on success. */ |
| 450 |
int |
| 451 |
check_passwd_quality (const char *pass, int strict) |
| 452 |
{ |
| 453 |
int i, nd=0, nc=0, n; |
| 454 |
|
| 455 |
n = strlen (pass); |
| 456 |
if (n < 8) |
| 457 |
return -1; |
| 458 |
|
| 459 |
for (i=0; i < n; i++) { |
| 460 |
if (isdigit (pass[i])) |
| 461 |
nd++; |
| 462 |
if (isalpha (pass[i])) |
| 463 |
nc++; |
| 464 |
} |
| 465 |
|
| 466 |
/* check that the passphrase contains letters and numbers. */ |
| 467 |
if (nd == n || nc == n) |
| 468 |
return -1; |
| 469 |
|
| 470 |
return 0; |
| 471 |
} |
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