1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598
|
/* export.c
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
* 2005 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include "options.h"
#include "packet.h"
#include "errors.h"
#include "keydb.h"
#include "memory.h"
#include "util.h"
#include "main.h"
#include "i18n.h"
#include "trustdb.h"
/* An object to keep track of subkeys. */
struct subkey_list_s
{
struct subkey_list_s *next;
u32 kid[2];
};
typedef struct subkey_list_s *subkey_list_t;
static int do_export( STRLIST users, int secret, unsigned int options );
static int do_export_stream( IOBUF out, STRLIST users, int secret,
KBNODE *keyblock_out, unsigned int options,
int *any );
int
parse_export_options(char *str,unsigned int *options,int noisy)
{
struct parse_options export_opts[]=
{
{"export-local-sigs",EXPORT_LOCAL_SIGS,NULL,
N_("export signatures that are marked as local-only")},
{"export-attributes",EXPORT_ATTRIBUTES,NULL,
N_("export attribute user IDs (generally photo IDs)")},
{"export-sensitive-revkeys",EXPORT_SENSITIVE_REVKEYS,NULL,
N_("export revocation keys marked as \"sensitive\"")},
{"export-reset-subkey-passwd",EXPORT_RESET_SUBKEY_PASSWD,NULL,
N_("remove the passphrase from exported subkeys")},
{"export-clean",EXPORT_CLEAN,NULL,
N_("remove unusable parts from key during export")},
{"export-minimal",EXPORT_MINIMAL|EXPORT_CLEAN,NULL,
N_("remove as much as possible from key during export")},
/* Aliases for backward compatibility */
{"include-local-sigs",EXPORT_LOCAL_SIGS,NULL,NULL},
{"include-attributes",EXPORT_ATTRIBUTES,NULL,NULL},
{"include-sensitive-revkeys",EXPORT_SENSITIVE_REVKEYS,NULL,NULL},
/* dummy */
{"export-unusable-sigs",0,NULL,NULL},
{"export-clean-sigs",0,NULL,NULL},
{"export-clean-uids",0,NULL,NULL},
{NULL,0,NULL,NULL}
/* add tags for include revoked and disabled? */
};
return parse_options(str,options,export_opts,noisy);
}
/****************
* Export the public keys (to standard out or --output).
* Depending on opt.armor the output is armored.
* options are defined in main.h.
* If USERS is NULL, the complete ring will be exported. */
int
export_pubkeys( STRLIST users, unsigned int options )
{
return do_export( users, 0, options );
}
/****************
* Export to an already opened stream; return -1 if no keys have
* been exported
*/
int
export_pubkeys_stream( IOBUF out, STRLIST users,
KBNODE *keyblock_out, unsigned int options )
{
int any, rc;
rc = do_export_stream( out, users, 0, keyblock_out, options, &any );
if( !rc && !any )
rc = -1;
return rc;
}
int
export_seckeys( STRLIST users )
{
return do_export( users, 1, 0 );
}
int
export_secsubkeys( STRLIST users )
{
return do_export( users, 2, 0 );
}
static int
do_export( STRLIST users, int secret, unsigned int options )
{
IOBUF out = NULL;
int any, rc;
armor_filter_context_t afx;
compress_filter_context_t zfx;
memset( &afx, 0, sizeof afx);
memset( &zfx, 0, sizeof zfx);
rc = open_outfile( NULL, 0, &out );
if( rc )
return rc;
if( opt.armor ) {
afx.what = secret?5:1;
iobuf_push_filter( out, armor_filter, &afx );
}
if( opt.compress_keys )
push_compress_filter(out,&zfx,default_compress_algo());
rc = do_export_stream( out, users, secret, NULL, options, &any );
if( rc || !any )
iobuf_cancel(out);
else
iobuf_close(out);
return rc;
}
/* Release an entire subkey list. */
static void
release_subkey_list (subkey_list_t list)
{
while (list)
{
subkey_list_t tmp = list->next;;
xfree (list);
list = tmp;
}
}
/* Returns true if NODE is a subkey and contained in LIST. */
static int
subkey_in_list_p (subkey_list_t list, KBNODE node)
{
if (node->pkt->pkttype == PKT_PUBLIC_SUBKEY
|| node->pkt->pkttype == PKT_SECRET_SUBKEY )
{
u32 kid[2];
if (node->pkt->pkttype == PKT_PUBLIC_SUBKEY)
keyid_from_pk (node->pkt->pkt.public_key, kid);
else
keyid_from_sk (node->pkt->pkt.secret_key, kid);
for (; list; list = list->next)
if (list->kid[0] == kid[0] && list->kid[1] == kid[1])
return 1;
}
return 0;
}
/* Allocate a new subkey list item from NODE. */
static subkey_list_t
new_subkey_list_item (KBNODE node)
{
subkey_list_t list = xcalloc (1, sizeof *list);
if (node->pkt->pkttype == PKT_PUBLIC_SUBKEY)
keyid_from_pk (node->pkt->pkt.public_key, list->kid);
else if (node->pkt->pkttype == PKT_SECRET_SUBKEY)
keyid_from_sk (node->pkt->pkt.secret_key, list->kid);
return list;
}
/* Helper function to check whether the subkey at NODE actually
matches the description at DESC. The function returns true if the
key under question has been specified by an exact specification
(keyID or fingerprint) and does match the one at NODE. It is
assumed that the packet at NODE is either a public or secret
subkey. */
static int
exact_subkey_match_p (KEYDB_SEARCH_DESC *desc, KBNODE node)
{
u32 kid[2];
byte fpr[MAX_FINGERPRINT_LEN];
size_t fprlen;
int result = 0;
switch(desc->mode)
{
case KEYDB_SEARCH_MODE_SHORT_KID:
case KEYDB_SEARCH_MODE_LONG_KID:
if (node->pkt->pkttype == PKT_PUBLIC_SUBKEY)
keyid_from_pk (node->pkt->pkt.public_key, kid);
else
keyid_from_sk (node->pkt->pkt.secret_key, kid);
break;
case KEYDB_SEARCH_MODE_FPR16:
case KEYDB_SEARCH_MODE_FPR20:
case KEYDB_SEARCH_MODE_FPR:
if (node->pkt->pkttype == PKT_PUBLIC_SUBKEY)
fingerprint_from_pk (node->pkt->pkt.public_key, fpr,&fprlen);
else
fingerprint_from_sk (node->pkt->pkt.secret_key, fpr,&fprlen);
break;
default:
break;
}
switch(desc->mode)
{
case KEYDB_SEARCH_MODE_SHORT_KID:
if (desc->u.kid[1] == kid[1])
result = 1;
break;
case KEYDB_SEARCH_MODE_LONG_KID:
if (desc->u.kid[0] == kid[0] && desc->u.kid[1] == kid[1])
result = 1;
break;
case KEYDB_SEARCH_MODE_FPR16:
if (!memcmp (desc->u.fpr, fpr, 16))
result = 1;
break;
case KEYDB_SEARCH_MODE_FPR20:
case KEYDB_SEARCH_MODE_FPR:
if (!memcmp (desc->u.fpr, fpr, 20))
result = 1;
break;
default:
break;
}
return result;
}
/* If keyblock_out is non-NULL, AND the exit code is zero, then it
contains a pointer to the first keyblock found and exported. No
other keyblocks are exported. The caller must free it. */
static int
do_export_stream( IOBUF out, STRLIST users, int secret,
KBNODE *keyblock_out, unsigned int options, int *any )
{
int rc = 0;
PACKET pkt;
KBNODE keyblock = NULL;
KBNODE kbctx, node;
size_t ndesc, descindex;
KEYDB_SEARCH_DESC *desc = NULL;
subkey_list_t subkey_list = NULL; /* Track alreay processed subkeys. */
KEYDB_HANDLE kdbhd;
STRLIST sl;
*any = 0;
init_packet( &pkt );
kdbhd = keydb_new (secret);
if (!users) {
ndesc = 1;
desc = xcalloc ( ndesc, sizeof *desc );
desc[0].mode = KEYDB_SEARCH_MODE_FIRST;
}
else {
for (ndesc=0, sl=users; sl; sl = sl->next, ndesc++)
;
desc = xmalloc ( ndesc * sizeof *desc);
for (ndesc=0, sl=users; sl; sl = sl->next) {
if (classify_user_id (sl->d, desc+ndesc))
ndesc++;
else
log_error (_("key \"%s\" not found: %s\n"),
sl->d, g10_errstr (G10ERR_INV_USER_ID));
}
/* It would be nice to see which of the given users did
actually match one in the keyring. To implement this we
need to have a found flag for each entry in desc and to set
this we must check all those entries after a match to mark
all matched one - currently we stop at the first match. To
do this we need an extra flag to enable this feature so */
}
#ifdef ENABLE_SELINUX_HACKS
if (secret) {
log_error (_("exporting secret keys not allowed\n"));
rc = G10ERR_GENERAL;
goto leave;
}
#endif
while (!(rc = keydb_search2 (kdbhd, desc, ndesc, &descindex))) {
int sha1_warned=0,skip_until_subkey=0;
u32 sk_keyid[2];
if (!users)
desc[0].mode = KEYDB_SEARCH_MODE_NEXT;
/* Read the keyblock. */
rc = keydb_get_keyblock (kdbhd, &keyblock );
if( rc ) {
log_error (_("error reading keyblock: %s\n"), g10_errstr(rc) );
goto leave;
}
if((node=find_kbnode(keyblock,PKT_SECRET_KEY)))
{
PKT_secret_key *sk=node->pkt->pkt.secret_key;
keyid_from_sk(sk,sk_keyid);
/* We can't apply GNU mode 1001 on an unprotected key. */
if( secret == 2 && !sk->is_protected )
{
log_info(_("key %s: not protected - skipped\n"),
keystr(sk_keyid));
continue;
}
/* No v3 keys with GNU mode 1001. */
if( secret == 2 && sk->version == 3 )
{
log_info(_("key %s: PGP 2.x style key - skipped\n"),
keystr(sk_keyid));
continue;
}
/* It does not make sense to export a key with a primary
key on card using a non-key stub. We simply skip those
keys when used with --export-secret-subkeys. */
if (secret == 2 && sk->is_protected
&& sk->protect.s2k.mode == 1002 )
{
log_info(_("key %s: key material on-card - skipped\n"),
keystr(sk_keyid));
continue;
}
}
else
{
/* It's a public key export, so do the cleaning if
requested. Note that both export-clean and
export-minimal only apply to UID sigs (0x10, 0x11,
0x12, and 0x13). A designated revocation is never
stripped, even with export-minimal set. */
if(options&EXPORT_CLEAN)
clean_key(keyblock,opt.verbose,options&EXPORT_MINIMAL,NULL,NULL);
}
/* And write it. */
for( kbctx=NULL; (node = walk_kbnode( keyblock, &kbctx, 0 )); ) {
if( skip_until_subkey )
{
if(node->pkt->pkttype==PKT_PUBLIC_SUBKEY
|| node->pkt->pkttype==PKT_SECRET_SUBKEY)
skip_until_subkey=0;
else
continue;
}
/* We used to use comment packets, but not any longer. In
case we still have comments on a key, strip them here
before we call build_packet(). */
if( node->pkt->pkttype == PKT_COMMENT )
continue;
/* Make sure that ring_trust packets never get exported. */
if (node->pkt->pkttype == PKT_RING_TRUST)
continue;
/* If exact is set, then we only export what was requested
(plus the primary key, if the user didn't specifically
request it). */
if(desc[descindex].exact
&& (node->pkt->pkttype==PKT_PUBLIC_SUBKEY
|| node->pkt->pkttype==PKT_SECRET_SUBKEY))
{
if (!exact_subkey_match_p (desc+descindex, node))
{
/* Before skipping this subkey, check whether any
other description wants an exact match on a
subkey and include that subkey into the output
too. Need to add this subkey to a list so that
it won't get processed a second time.
So the first step here is to check that list and
skip in any case if the key is in that list.
We need this whole mess because the import
function is not able to merge secret keys and
thus it is useless to output them as two
separate keys and have import merge them. */
if (subkey_in_list_p (subkey_list, node))
skip_until_subkey = 1; /* Already processed this one. */
else
{
size_t j;
for (j=0; j < ndesc; j++)
if (j != descindex && desc[j].exact
&& exact_subkey_match_p (desc+j, node))
break;
if (!(j < ndesc))
skip_until_subkey = 1; /* No other one matching. */
}
}
if(skip_until_subkey)
continue;
/* Mark this one as processed. */
{
subkey_list_t tmp = new_subkey_list_item (node);
tmp->next = subkey_list;
subkey_list = tmp;
}
}
if(node->pkt->pkttype==PKT_SIGNATURE)
{
/* do not export packets which are marked as not
exportable */
if(!(options&EXPORT_LOCAL_SIGS)
&& !node->pkt->pkt.signature->flags.exportable)
continue; /* not exportable */
/* Do not export packets with a "sensitive" revocation
key unless the user wants us to. Note that we do
export these when issuing the actual revocation
(see revoke.c). */
if(!(options&EXPORT_SENSITIVE_REVKEYS)
&& node->pkt->pkt.signature->revkey)
{
int i;
for(i=0;i<node->pkt->pkt.signature->numrevkeys;i++)
if(node->pkt->pkt.signature->revkey[i]->class & 0x40)
break;
if(i<node->pkt->pkt.signature->numrevkeys)
continue;
}
}
/* Don't export attribs? */
if( !(options&EXPORT_ATTRIBUTES) &&
node->pkt->pkttype == PKT_USER_ID &&
node->pkt->pkt.user_id->attrib_data ) {
/* Skip until we get to something that is not an attrib
or a signature on an attrib */
while(kbctx->next && kbctx->next->pkt->pkttype==PKT_SIGNATURE) {
kbctx=kbctx->next;
}
continue;
}
if( secret == 2 && node->pkt->pkttype == PKT_SECRET_KEY )
{
/* We don't want to export the secret parts of the
* primary key, this is done by using GNU protection mode 1001
*/
int save_mode = node->pkt->pkt.secret_key->protect.s2k.mode;
node->pkt->pkt.secret_key->protect.s2k.mode = 1001;
rc = build_packet( out, node->pkt );
node->pkt->pkt.secret_key->protect.s2k.mode = save_mode;
}
else if (secret == 2 && node->pkt->pkttype == PKT_SECRET_SUBKEY
&& (opt.export_options&EXPORT_RESET_SUBKEY_PASSWD))
{
/* If the subkey is protected reset the passphrase to
export an unprotected subkey. This feature is
useful in cases of a subkey copied to an unattended
machine where a passphrase is not required. */
PKT_secret_key *sk_save, *sk;
sk_save = node->pkt->pkt.secret_key;
sk = copy_secret_key (NULL, sk_save);
node->pkt->pkt.secret_key = sk;
log_info (_("about to export an unprotected subkey\n"));
switch (is_secret_key_protected (sk))
{
case -1:
rc = G10ERR_PUBKEY_ALGO;
break;
case 0:
break;
default:
if (sk->protect.s2k.mode == 1001)
; /* No secret parts. */
else if( sk->protect.s2k.mode == 1002 )
; /* Card key stub. */
else
{
rc = check_secret_key( sk, 0 );
}
break;
}
if (rc)
{
node->pkt->pkt.secret_key = sk_save;
free_secret_key (sk);
log_error (_("failed to unprotect the subkey: %s\n"),
g10_errstr (rc));
goto leave;
}
rc = build_packet (out, node->pkt);
node->pkt->pkt.secret_key = sk_save;
free_secret_key (sk);
}
else
{
/* Warn the user if the secret key or any of the secret
subkeys are protected with SHA1 and we have
simple_sk_checksum set. */
if(!sha1_warned && opt.simple_sk_checksum &&
(node->pkt->pkttype==PKT_SECRET_KEY ||
node->pkt->pkttype==PKT_SECRET_SUBKEY) &&
node->pkt->pkt.secret_key->protect.sha1chk)
{
/* I hope this warning doesn't confuse people. */
log_info(_("WARNING: secret key %s does not have a "
"simple SK checksum\n"),keystr(sk_keyid));
sha1_warned=1;
}
rc = build_packet( out, node->pkt );
}
if( rc ) {
log_error("build_packet(%d) failed: %s\n",
node->pkt->pkttype, g10_errstr(rc) );
rc = G10ERR_WRITE_FILE;
goto leave;
}
}
++*any;
if(keyblock_out)
{
*keyblock_out=keyblock;
break;
}
}
if( rc == -1 )
rc = 0;
leave:
release_subkey_list (subkey_list);
xfree(desc);
keydb_release (kdbhd);
if(rc || keyblock_out==NULL)
release_kbnode( keyblock );
if( !*any )
log_info(_("WARNING: nothing exported\n"));
return rc;
}
|