| 1 |
/* wptGPGUtil.cpp - GPG helper functions |
| 2 |
* Copyright (C) 2005 g10 Code GmbH |
| 3 |
* |
| 4 |
* This file is part of WinPT. |
| 5 |
* |
| 6 |
* WinPT is free software; you can redistribute it and/or modify |
| 7 |
* it under the terms of the GNU General Public License as published by |
| 8 |
* the Free Software Foundation; either version 2 of the License, or |
| 9 |
* (at your option) any later version. |
| 10 |
* |
| 11 |
* WinPT 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 General Public License |
| 17 |
* along with WinPT; if not, write to the Free Software Foundation, |
| 18 |
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
| 19 |
*/ |
| 20 |
#include <windows.h> |
| 21 |
#include <sys/stat.h> |
| 22 |
|
| 23 |
#include "gpgme.h" |
| 24 |
|
| 25 |
|
| 26 |
#define NROFHEXDIGITS 2 |
| 27 |
/* Convert two hexadecimal digits from STR to the value they |
| 28 |
represent. Returns -1 if one of the characters is not a |
| 29 |
hexadecimal digit. */ |
| 30 |
static int |
| 31 |
hextobyte (const unsigned char *str) |
| 32 |
{ |
| 33 |
int val = 0; |
| 34 |
int i; |
| 35 |
|
| 36 |
for (i = 0; i < NROFHEXDIGITS; i++) { |
| 37 |
if (*str >= '0' && *str <= '9') |
| 38 |
val += *str - '0'; |
| 39 |
else if (*str >= 'A' && *str <= 'F') |
| 40 |
val += 10 + *str - 'A'; |
| 41 |
else if (*str >= 'a' && *str <= 'f') |
| 42 |
val += 10 + *str - 'a'; |
| 43 |
else |
| 44 |
return -1; |
| 45 |
if (i < NROFHEXDIGITS - 1) |
| 46 |
val *= 16; |
| 47 |
str++; |
| 48 |
} |
| 49 |
return val; |
| 50 |
} |
| 51 |
|
| 52 |
/* Decode the C formatted string @src and store the result in the |
| 53 |
buffer @destp which is @len bytes long. If @len is zero, then a |
| 54 |
large enough buffer is allocated with malloc and @destp is set to |
| 55 |
the result. Currently, @len is only used to specify if allocation |
| 56 |
is desired or not, the caller is expected to make sure that @destp |
| 57 |
is large enough if @len is not zero. */ |
| 58 |
gpgme_error_t |
| 59 |
gpg_decode_c_string (const char *src, char **destp, size_t len) |
| 60 |
{ |
| 61 |
char *dest; |
| 62 |
|
| 63 |
/* Set up the destination buffer. */ |
| 64 |
if (len) { |
| 65 |
if (len < strlen (src) + 1) |
| 66 |
return gpg_error (GPG_ERR_TOO_SHORT); |
| 67 |
dest = *destp; |
| 68 |
} |
| 69 |
else { |
| 70 |
/* The converted string will never be larger than the original string. */ |
| 71 |
dest = (char*)malloc (strlen (src) + 1); |
| 72 |
if (!dest) |
| 73 |
return gpg_error (GPG_ERR_ENOMEM); |
| 74 |
*destp = dest; |
| 75 |
} |
| 76 |
|
| 77 |
/* Convert the string. */ |
| 78 |
while (*src) { |
| 79 |
if (*src != '\\') { |
| 80 |
*(dest++) = *(src++); |
| 81 |
continue; |
| 82 |
} |
| 83 |
|
| 84 |
switch (src[1]) { |
| 85 |
#define DECODE_ONE(match,result) \ |
| 86 |
case match: \ |
| 87 |
src += 2; \ |
| 88 |
*(dest++) = result; \ |
| 89 |
break; |
| 90 |
|
| 91 |
DECODE_ONE ('\'', '\''); |
| 92 |
DECODE_ONE ('\"', '\"'); |
| 93 |
DECODE_ONE ('\?', '\?'); |
| 94 |
DECODE_ONE ('\\', '\\'); |
| 95 |
DECODE_ONE ('a', '\a'); |
| 96 |
DECODE_ONE ('b', '\b'); |
| 97 |
DECODE_ONE ('f', '\f'); |
| 98 |
DECODE_ONE ('n', '\n'); |
| 99 |
DECODE_ONE ('r', '\r'); |
| 100 |
DECODE_ONE ('t', '\t'); |
| 101 |
DECODE_ONE ('v', '\v'); |
| 102 |
|
| 103 |
case 'x': { |
| 104 |
int val = hextobyte ((unsigned char*)&src[2]); |
| 105 |
if (val == -1) { |
| 106 |
/* Should not happen. */ |
| 107 |
*(dest++) = *(src++); |
| 108 |
*(dest++) = *(src++); |
| 109 |
if (*src) |
| 110 |
*(dest++) = *(src++); |
| 111 |
if (*src) |
| 112 |
*(dest++) = *(src++); |
| 113 |
} |
| 114 |
else { |
| 115 |
if (!val) { |
| 116 |
/* A binary zero is not representable in a C |
| 117 |
string. */ |
| 118 |
*(dest++) = '\\'; |
| 119 |
*(dest++) = '0'; |
| 120 |
} |
| 121 |
else |
| 122 |
*((unsigned char *) dest++) = val; |
| 123 |
src += 4; |
| 124 |
} |
| 125 |
} |
| 126 |
|
| 127 |
default: |
| 128 |
{ |
| 129 |
/* Should not happen. */ |
| 130 |
*(dest++) = *(src++); |
| 131 |
*(dest++) = *(src++); |
| 132 |
} |
| 133 |
} |
| 134 |
} |
| 135 |
*(dest++) = 0; |
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return 0; |
| 137 |
} |
| 138 |
|
| 139 |
/* Replace %foo% entries with its real values. |
| 140 |
Return value: expanded path or NULL on error. */ |
| 141 |
static char * |
| 142 |
expand_path (const char *path) |
| 143 |
{ |
| 144 |
DWORD len; |
| 145 |
char *p; |
| 146 |
|
| 147 |
len = ExpandEnvironmentStrings (path, NULL, 0); |
| 148 |
if (!len) |
| 149 |
return NULL; |
| 150 |
len += 1; |
| 151 |
p = (char*)calloc (1, len+1); |
| 152 |
if (!p) |
| 153 |
abort (); |
| 154 |
len = ExpandEnvironmentStrings (path, p, len); |
| 155 |
if (!len) { |
| 156 |
free (p); |
| 157 |
return NULL; |
| 158 |
} |
| 159 |
return p; |
| 160 |
} |
| 161 |
|
| 162 |
|
| 163 |
/* Read a string from the W32 registry. The directory is given |
| 164 |
in @dir and the name of the value in @name, */ |
| 165 |
static char * |
| 166 |
read_w32_registry (HKEY root_key, const char *dir, const char *name ) |
| 167 |
{ |
| 168 |
HKEY key_handle; |
| 169 |
DWORD n1, nbytes; |
| 170 |
DWORD type; |
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char *result = NULL; |
| 172 |
|
| 173 |
if (RegOpenKeyEx (root_key, dir, 0, KEY_READ, &key_handle)) |
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return NULL; /* no need for a RegClose, so return direct */ |
| 175 |
|
| 176 |
nbytes = 1; |
| 177 |
if (RegQueryValueEx (key_handle, name, 0, NULL, NULL, &nbytes)) |
| 178 |
goto leave; |
| 179 |
result = (char*)calloc (1, (n1=nbytes+1)); |
| 180 |
if (!result) |
| 181 |
abort (); |
| 182 |
if (RegQueryValueEx (key_handle, name, 0, &type, (BYTE*)result, &n1)) { |
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free (result); |
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result = NULL; |
| 185 |
goto leave; |
| 186 |
} |
| 187 |
if (type == REG_EXPAND_SZ && strchr (result, '%')) { |
| 188 |
char *p = expand_path (result); |
| 189 |
free (result); |
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result = p; |
| 191 |
} |
| 192 |
|
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leave: |
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RegCloseKey (key_handle); |
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return result; |
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} |
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|
| 198 |
|
| 199 |
/* Create a temp file based on the name of @name. |
| 200 |
Return value: handle to the file in case of success. */ |
| 201 |
static HANDLE |
| 202 |
create_tmpfile (const char *name) |
| 203 |
{ |
| 204 |
HANDLE out; |
| 205 |
SECURITY_ATTRIBUTES sattr; |
| 206 |
char tmp[300]; |
| 207 |
|
| 208 |
memset (&sattr, 0, sizeof sattr); |
| 209 |
sattr.bInheritHandle = TRUE; |
| 210 |
sattr.lpSecurityDescriptor = NULL; |
| 211 |
sattr.nLength = sizeof sattr; |
| 212 |
|
| 213 |
GetTempPath (300 - 64, tmp); |
| 214 |
strcat (tmp, name); |
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out = CreateFile (tmp, GENERIC_READ|GENERIC_WRITE, |
| 216 |
FILE_SHARE_WRITE, &sattr, |
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OPEN_ALWAYS, FILE_FLAG_DELETE_ON_CLOSE, NULL); |
| 218 |
return out; |
| 219 |
} |
| 220 |
|
| 221 |
|
| 222 |
/* Create a pipe with a readable remote end and |
| 223 |
write the data from @dat to the local end. |
| 224 |
Return value: read handle on success. */ |
| 225 |
static HANDLE |
| 226 |
create_in_pipe (const char *dat) |
| 227 |
{ |
| 228 |
HANDLE r, w; |
| 229 |
SECURITY_ATTRIBUTES sec_attr; |
| 230 |
DWORD n; |
| 231 |
|
| 232 |
memset (&sec_attr, 0, sizeof sec_attr); |
| 233 |
sec_attr.bInheritHandle = TRUE; |
| 234 |
sec_attr.nLength = sizeof sec_attr; |
| 235 |
|
| 236 |
if (!CreatePipe (&r, &w, &sec_attr, 4096)) |
| 237 |
return NULL; |
| 238 |
|
| 239 |
WriteFile (w, dat, strlen (dat), &n, NULL); |
| 240 |
CloseHandle (w); |
| 241 |
|
| 242 |
return r; |
| 243 |
} |
| 244 |
|
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|
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/* Map the contents of the file handle @out to |
| 247 |
a buffer and return it. */ |
| 248 |
static char* |
| 249 |
map_tmpfile (HANDLE out) |
| 250 |
{ |
| 251 |
DWORD n; |
| 252 |
char *p; |
| 253 |
|
| 254 |
FlushFileBuffers (out); |
| 255 |
SetFilePointer (out, 0, NULL, FILE_BEGIN); |
| 256 |
n = GetFileSize (out, NULL); |
| 257 |
p = (char*)calloc (1, n+1); |
| 258 |
if (!p) |
| 259 |
abort (); |
| 260 |
ReadFile (out, p, n, &n, NULL); |
| 261 |
p[n] = 0; |
| 262 |
return p; |
| 263 |
} |
| 264 |
|
| 265 |
|
| 266 |
/* Create a process from the command line in @cmd. |
| 267 |
If @out is != NULL, the output of the process will |
| 268 |
be redirected to @out. If @in is != NULL the input |
| 269 |
will be read from @in. |
| 270 |
Return value: 0 on success. */ |
| 271 |
static int |
| 272 |
create_process (const char *cmd, HANDLE in, HANDLE out) |
| 273 |
{ |
| 274 |
STARTUPINFO si; |
| 275 |
PROCESS_INFORMATION pi; |
| 276 |
|
| 277 |
memset (&si, 0, sizeof (si)); |
| 278 |
si.cb = sizeof si; |
| 279 |
if (in || out) |
| 280 |
si.dwFlags = STARTF_USESTDHANDLES; |
| 281 |
if (out) |
| 282 |
si.hStdOutput = out; |
| 283 |
if (in) |
| 284 |
si.hStdInput = in; |
| 285 |
if (!CreateProcess (NULL, (char*)cmd, NULL, NULL, TRUE, 0, NULL, NULL, &si, &pi)) |
| 286 |
return -1; |
| 287 |
WaitForSingleObject (pi.hProcess, INFINITE); |
| 288 |
CloseHandle (pi.hProcess); |
| 289 |
return 0; |
| 290 |
} |
| 291 |
|
| 292 |
|
| 293 |
/* Export a GPG secret key given by @keyid into the file @outfile. |
| 294 |
Return value: 0 on success. */ |
| 295 |
gpgme_error_t |
| 296 |
gpg_export_seckey (const char *keyid, const char *outfile) |
| 297 |
{ |
| 298 |
gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR); |
| 299 |
struct stat st; |
| 300 |
char *p; |
| 301 |
char *cmd; |
| 302 |
|
| 303 |
p = read_w32_registry (HKEY_CURRENT_USER, "Software\\GNU\\GnuPG", "gpgProgram"); |
| 304 |
if (!p) |
| 305 |
return gpg_error (GPG_ERR_INV_ARG); |
| 306 |
cmd = (char*)calloc (1, strlen (p) + strlen (keyid) + strlen (outfile ) + 64 + 2); |
| 307 |
if (!cmd) |
| 308 |
abort (); |
| 309 |
sprintf (cmd, "%s --yes --output \"%s\" --export-secret-key %s", p, outfile, keyid); |
| 310 |
if (create_process (cmd, NULL, NULL)) |
| 311 |
err = gpg_error (GPG_ERR_INTERNAL); |
| 312 |
|
| 313 |
if (stat (outfile, &st) == -1 || st.st_size == 0) |
| 314 |
err = gpg_error (GPG_ERR_NO_DATA); |
| 315 |
|
| 316 |
free (p); |
| 317 |
free (cmd); |
| 318 |
return err; |
| 319 |
} |
| 320 |
|
| 321 |
|
| 322 |
/* If @export is 1, export the ownertrust data to the |
| 323 |
buffer @data. Otherwise import the ownertrust data from @data. |
| 324 |
Return value: 0 on success. */ |
| 325 |
gpgme_error_t |
| 326 |
gpg_manage_ownertrust (char **data, int export) |
| 327 |
{ |
| 328 |
gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR); |
| 329 |
HANDLE out = NULL, in = NULL; |
| 330 |
char *p; |
| 331 |
char *cmd; |
| 332 |
|
| 333 |
p = read_w32_registry (HKEY_CURRENT_USER, "Software\\GNU\\GnuPG", "gpgProgram"); |
| 334 |
if (!p) |
| 335 |
return gpg_error (GPG_ERR_INV_ARG); |
| 336 |
|
| 337 |
cmd = (char*)calloc (1, strlen (p) + 64 + 1); |
| 338 |
if (!cmd) |
| 339 |
abort (); |
| 340 |
sprintf (cmd, "%s %s", p, export? "--export-ownertrust" : "--import-ownertrust"); |
| 341 |
|
| 342 |
if (export) |
| 343 |
out = create_tmpfile ("gpg_ot_out"); |
| 344 |
else { |
| 345 |
DWORD nw; |
| 346 |
in = create_tmpfile ("gpg_ot_in"); |
| 347 |
WriteFile (in, *data, strlen (*data), &nw, NULL); |
| 348 |
FlushFileBuffers (in); |
| 349 |
/* XXX: need a rewind? */ |
| 350 |
} |
| 351 |
if (create_process (cmd, in, out)) |
| 352 |
err = gpg_error (GPG_ERR_INTERNAL); |
| 353 |
|
| 354 |
free (p); |
| 355 |
free (cmd); |
| 356 |
|
| 357 |
if (in) |
| 358 |
CloseHandle (in); |
| 359 |
if (out) { |
| 360 |
*data = map_tmpfile (out); |
| 361 |
CloseHandle (out); |
| 362 |
} |
| 363 |
return err; |
| 364 |
} |
| 365 |
|
| 366 |
/* Call gpg --rebuild-keydb-caches to speed up signature listings. */ |
| 367 |
gpgme_error_t |
| 368 |
gpg_rebuild_cache (char **r_inf) |
| 369 |
{ |
| 370 |
gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR); |
| 371 |
HANDLE out = NULL; |
| 372 |
char *p; |
| 373 |
char *cmd; |
| 374 |
|
| 375 |
p = read_w32_registry (HKEY_CURRENT_USER, "Software\\GNU\\GnuPG", "gpgProgram"); |
| 376 |
if (!p) |
| 377 |
return gpg_error (GPG_ERR_INV_ARG); |
| 378 |
cmd = (char*)calloc (1, strlen (p) + 64); |
| 379 |
if (!cmd) |
| 380 |
abort (); |
| 381 |
sprintf (cmd, "%s --logger-fd=1 --rebuild-keydb-caches", p); |
| 382 |
|
| 383 |
if (r_inf) |
| 384 |
out = create_tmpfile ("gpg_rebuild_cache"); |
| 385 |
|
| 386 |
if (create_process (cmd, NULL, out)) |
| 387 |
err = gpg_error (GPG_ERR_INTERNAL); |
| 388 |
|
| 389 |
if (r_inf) |
| 390 |
*r_inf = map_tmpfile (out); |
| 391 |
if (out) |
| 392 |
CloseHandle (out); |
| 393 |
free (p); |
| 394 |
free (cmd); |
| 395 |
return 0; |
| 396 |
} |
| 397 |
|
| 398 |
/* Call gpg --version to retrieve the 'about' information. */ |
| 399 |
gpgme_error_t |
| 400 |
gpg_get_version (char **r_inf) |
| 401 |
{ |
| 402 |
gpgme_error_t err= gpg_error (GPG_ERR_NO_ERROR); |
| 403 |
HANDLE out; |
| 404 |
char *p, *cmd; |
| 405 |
|
| 406 |
p =read_w32_registry (HKEY_CURRENT_USER, "Software\\GNU\\GnuPG", "gpgProgram"); |
| 407 |
if (!p) |
| 408 |
return gpg_error (GPG_ERR_INV_ARG); |
| 409 |
cmd = (char*)calloc (1, strlen (p) + 32); |
| 410 |
if (!cmd) |
| 411 |
abort (); |
| 412 |
sprintf (cmd, "%s --version", p); |
| 413 |
|
| 414 |
out = create_tmpfile ("gpg_out"); |
| 415 |
if (create_process (cmd, NULL, out)) |
| 416 |
err = gpg_error (GPG_ERR_INTERNAL); |
| 417 |
|
| 418 |
free (p); |
| 419 |
free (cmd); |
| 420 |
|
| 421 |
*r_inf = map_tmpfile (out); |
| 422 |
CloseHandle (out); |
| 423 |
return err; |
| 424 |
} |
| 425 |
|
| 426 |
/* Return the colon file output of the given file @fname in @r_out. |
| 427 |
Return value: 0 on success. */ |
| 428 |
gpgme_error_t |
| 429 |
gpg_import_key_list (const char *fname, char **r_out) |
| 430 |
{ |
| 431 |
gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR); |
| 432 |
char *cmd, *p; |
| 433 |
HANDLE out; |
| 434 |
|
| 435 |
p = read_w32_registry (HKEY_CURRENT_USER, "Software\\GNU\\GnuPG", "gpgProgram"); |
| 436 |
if (!p) |
| 437 |
return gpg_error (GPG_ERR_INV_ARG); |
| 438 |
|
| 439 |
cmd = (char*)calloc (1, strlen (p) + strlen (fname) + 2+2 + 64); |
| 440 |
if (!cmd) |
| 441 |
abort (); |
| 442 |
sprintf (cmd, "%s --fixed-list-mode --with-colons \"%s\"", p, fname); |
| 443 |
|
| 444 |
out = create_tmpfile ("gpg_keys"); |
| 445 |
if (create_process (cmd, NULL, out)) |
| 446 |
err = gpg_error (GPG_ERR_INTERNAL); |
| 447 |
|
| 448 |
free (p); |
| 449 |
free (cmd); |
| 450 |
|
| 451 |
*r_out = map_tmpfile (out); |
| 452 |
CloseHandle (out); |
| 453 |
return err; |
| 454 |
} |
| 455 |
|
| 456 |
char* |
| 457 |
generate_revoc_input (int code, const char *cmt, const char *pass) |
| 458 |
{ |
| 459 |
const char *fmt; |
| 460 |
char *p; |
| 461 |
size_t n; |
| 462 |
|
| 463 |
fmt = "Y\n" /* gen_revoke.okay */ |
| 464 |
"%d\n" /* ask_revocation_reason.code */ |
| 465 |
"%s\n" /* ask_revocation_reason.text */ |
| 466 |
"%s" /* text != NULL '\n' otherwise '' */ |
| 467 |
"Y\n" /* ask_revocation_reason.okay */ |
| 468 |
"%s\n"; /* passphrase.enter. */ |
| 469 |
n = strlen (fmt) + 32; |
| 470 |
if (pass) |
| 471 |
n += strlen (pass) + 1; |
| 472 |
if (cmt) |
| 473 |
n += strlen (cmt) + 1; |
| 474 |
p = (char*)calloc (1, n+1); |
| 475 |
if (!p) |
| 476 |
abort (); |
| 477 |
sprintf (p, fmt, code, cmt? cmt : "", cmt? "\n" : "", pass? pass : ""); |
| 478 |
return p; |
| 479 |
} |
| 480 |
|
| 481 |
|
| 482 |
/* Generate a revocation certificate for the key with the keyid @keyid. |
| 483 |
@inp_data contains all needed data to answer the questions of the |
| 484 |
command handler. Each separate with a '\n'. |
| 485 |
@r_revcert contains the revocation cert on success. |
| 486 |
Return value: 0 on success. */ |
| 487 |
gpgme_error_t |
| 488 |
gpg_revoke_key (const char *inp_data, const char *keyid, char **r_revcert) |
| 489 |
{ |
| 490 |
gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR); |
| 491 |
char *rcrt; |
| 492 |
char *cmd, *p; |
| 493 |
HANDLE in, out; |
| 494 |
|
| 495 |
p = read_w32_registry (HKEY_CURRENT_USER, "Software\\GNU\\GnuPG", "gpgProgram"); |
| 496 |
if (!p) |
| 497 |
return gpg_error (GPG_ERR_INV_ARG); |
| 498 |
|
| 499 |
cmd = (char*)calloc (1, strlen (p) + 128); |
| 500 |
if (!cmd) |
| 501 |
abort (); |
| 502 |
sprintf (cmd, "%s --pgp7 --command-fd=0 --status-fd=2 --gen-revoke %s", p, keyid); |
| 503 |
|
| 504 |
in = create_in_pipe (inp_data); |
| 505 |
out = create_tmpfile ("gpg_revcert"); |
| 506 |
if (create_process (cmd, in, out)) { |
| 507 |
*r_revcert = NULL; |
| 508 |
err = gpg_error (GPG_ERR_INTERNAL); |
| 509 |
} |
| 510 |
else { |
| 511 |
rcrt = map_tmpfile (out); |
| 512 |
*r_revcert = rcrt; |
| 513 |
} |
| 514 |
|
| 515 |
free (p); |
| 516 |
free (cmd); |
| 517 |
|
| 518 |
CloseHandle (in); |
| 519 |
CloseHandle (out); |
| 520 |
return err; |
| 521 |
} |
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