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gnupg/g10/export.c

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/* export.c
* Copyright (C) 1998, 1999, 2000, 2001, 2002,
* 2003 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#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"
static int do_export( STRLIST users, int secret, unsigned int options );
static int do_export_stream( iobuf_t out, STRLIST users, int secret,
KBNODE *keyblock_out, unsigned int options,
int *any );
static int build_sexp (iobuf_t out, PACKET *pkt, int *indent);
int
parse_export_options(char *str,unsigned int *options)
{
struct parse_options export_opts[]=
{
{"include-non-rfc",EXPORT_INCLUDE_NON_RFC},
{"include-local-sigs",EXPORT_INCLUDE_LOCAL_SIGS},
{"include-attributes",EXPORT_INCLUDE_ATTRIBUTES},
{"include-sensitive-revkeys",EXPORT_INCLUDE_SENSITIVE_REVKEYS},
{"sexp-format",EXPORT_SEXP_FORMAT},
{NULL,0}
/* add tags for include revoked and disabled? */
};
return parse_options(str,options,export_opts);
}
/****************
* 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_t 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 )
{
/* Use only relevant options for the secret key. */
unsigned int options = (opt.export_options & EXPORT_SEXP_FORMAT);
return do_export (users, 1, options);
}
int
export_secsubkeys( STRLIST users )
{
/* Use only relevant options for the secret key. */
unsigned int options = (opt.export_options & EXPORT_SEXP_FORMAT);
return do_export( users, 2, options);
}
static int
do_export (STRLIST users, int secret, unsigned int options)
{
iobuf_t 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 (!(options & EXPORT_SEXP_FORMAT))
{
if (opt.armor)
{
afx.what = secret?5:1;
iobuf_push_filter( out, armor_filter, &afx );
}
if (opt.compress_keys && opt.compress)
iobuf_push_filter( out, compress_filter, &zfx );
}
rc = do_export_stream (out, users, secret, NULL, options, &any );
if (rc || !any)
iobuf_cancel (out);
else
iobuf_close (out);
return rc;
}
/* 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_t 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;
KEYDB_HANDLE kdbhd;
STRLIST sl;
int indent = 0;
*any = 0;
init_packet( &pkt );
kdbhd = keydb_new (secret);
if (!users) {
ndesc = 1;
desc = xcalloc (1, 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, gpg_strerror (GPG_ERR_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 */
}
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"), gpg_strerror (rc) );
goto leave;
}
/* do not export keys which are incompatible with rfc2440 */
if( !(options&EXPORT_INCLUDE_NON_RFC) &&
(node = find_kbnode( keyblock, PKT_PUBLIC_KEY )) ) {
PKT_public_key *pk = node->pkt->pkt.public_key;
if( pk->version == 3 && pk->pubkey_algo > 3 ) {
log_info(_("key %08lX: not a rfc2440 key - skipped\n"),
(ulong)keyid_from_pk( pk, NULL) );
continue;
}
}
node=find_kbnode( keyblock, PKT_SECRET_KEY );
if(node)
{
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 %08lX: not protected - skipped\n"),
(ulong)sk_keyid[1]);
continue;
}
/* no v3 keys with GNU mode 1001 */
if( secret == 2 && sk->version == 3 )
{
log_info(_("key %08lX: PGP 2.x style key - skipped\n"),
(ulong)sk_keyid[1]);
continue;
}
}
/* 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;
}
/* don't export any comment packets but those in the
* secret keyring */
if( !secret && 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))
{
u32 kid[2];
byte fpr[MAX_FINGERPRINT_LEN];
size_t fprlen;
switch(desc[descindex].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[descindex].mode)
{
case KEYDB_SEARCH_MODE_SHORT_KID:
if (desc[descindex].u.kid[1] != kid[1])
skip_until_subkey=1;
break;
case KEYDB_SEARCH_MODE_LONG_KID:
if (desc[descindex].u.kid[0] != kid[0]
|| desc[descindex].u.kid[1] != kid[1])
skip_until_subkey=1;
break;
case KEYDB_SEARCH_MODE_FPR16:
if (memcmp (desc[descindex].u.fpr, fpr, 16))
skip_until_subkey=1;
break;
case KEYDB_SEARCH_MODE_FPR20:
case KEYDB_SEARCH_MODE_FPR:
if (memcmp (desc[descindex].u.fpr, fpr, 20))
skip_until_subkey=1;
break;
default:
break;
}
if(skip_until_subkey)
continue;
}
if( node->pkt->pkttype == PKT_SIGNATURE ) {
/* do not export packets which are marked as not exportable */
if( !(options&EXPORT_INCLUDE_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_INCLUDE_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_INCLUDE_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;
if ((options&EXPORT_SEXP_FORMAT))
rc = build_sexp (out, node->pkt, &indent);
else
rc = build_packet (out, node->pkt);
node->pkt->pkt.secret_key->protect.s2k.mode = save_mode;
}
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 %08lX does not have a "
"simple SK checksum\n"),(ulong)sk_keyid[1]);
sha1_warned=1;
}
if ((options&EXPORT_SEXP_FORMAT))
rc = build_sexp (out, node->pkt, &indent);
else
rc = build_packet (out, node->pkt);
}
if( rc ) {
log_error("build_packet(%d) failed: %s\n",
node->pkt->pkttype, gpg_strerror (rc) );
goto leave;
}
}
if ((options&EXPORT_SEXP_FORMAT) && indent)
{
for (; indent; indent--)
iobuf_put (out, ')');
iobuf_put (out, '\n');
}
++*any;
if(keyblock_out)
{
*keyblock_out=keyblock;
break;
}
}
if ((options&EXPORT_SEXP_FORMAT) && indent)
{
for (; indent; indent--)
iobuf_put (out, ')');
iobuf_put (out, '\n');
}
if( rc == -1 )
rc = 0;
leave:
xfree (desc);
keydb_release (kdbhd);
if(rc || keyblock_out==NULL)
release_kbnode( keyblock );
if( !*any )
log_info(_("WARNING: nothing exported\n"));
return rc;
}
static int
write_sexp_line (iobuf_t out, int *indent, const char *text)
{
int i;
for (i=0; i < *indent; i++)
iobuf_put (out, ' ');
iobuf_writestr (out, text);
return 0;
}
static int
write_sexp_keyparm (iobuf_t out, int *indent, const char *name, gcry_mpi_t a)
{
int rc;
unsigned char *buffer;
write_sexp_line (out, indent, "(");
iobuf_writestr (out, name);
iobuf_writestr (out, " #");
rc = gcry_mpi_aprint (GCRYMPI_FMT_HEX, &buffer, NULL, a);
assert (!rc);
iobuf_writestr (out, buffer);
iobuf_writestr (out, "#)");
gcry_free (buffer);
return 0;
}
static int
build_sexp_seckey (iobuf_t out, PACKET *pkt, int *indent)
{
PKT_secret_key *sk = pkt->pkt.secret_key;
char tmpbuf[100];
if (pkt->pkttype == PKT_SECRET_KEY)
{
iobuf_writestr (out, "(openpgp-key\n");
(*indent)++;
}
else
{
iobuf_writestr (out, " (subkey\n");
(*indent)++;
}
(*indent)++;
write_sexp_line (out, indent, "(private-key\n");
(*indent)++;
if (is_RSA (sk->pubkey_algo) && !sk->is_protected)
{
write_sexp_line (out, indent, "(rsa\n");
(*indent)++;
write_sexp_keyparm (out, indent, "n", sk->skey[0]); iobuf_put (out,'\n');
write_sexp_keyparm (out, indent, "e", sk->skey[1]); iobuf_put (out,'\n');
write_sexp_keyparm (out, indent, "d", sk->skey[2]); iobuf_put (out,'\n');
write_sexp_keyparm (out, indent, "p", sk->skey[3]); iobuf_put (out,'\n');
write_sexp_keyparm (out, indent, "q", sk->skey[4]); iobuf_put (out,'\n');
write_sexp_keyparm (out, indent, "u", sk->skey[5]);
iobuf_put (out,')'); iobuf_put (out,'\n');
(*indent)--;
}
else if (sk->pubkey_algo == PUBKEY_ALGO_DSA && !sk->is_protected)
{
write_sexp_line (out, indent, "(dsa\n");
(*indent)++;
write_sexp_keyparm (out, indent, "p", sk->skey[0]); iobuf_put (out,'\n');
write_sexp_keyparm (out, indent, "q", sk->skey[1]); iobuf_put (out,'\n');
write_sexp_keyparm (out, indent, "g", sk->skey[2]); iobuf_put (out,'\n');
write_sexp_keyparm (out, indent, "y", sk->skey[3]); iobuf_put (out,'\n');
write_sexp_keyparm (out, indent, "x", sk->skey[4]);
iobuf_put (out,')'); iobuf_put (out,'\n');
(*indent)--;
}
else if (is_ELGAMAL (sk->pubkey_algo) && !sk->is_protected)
{
write_sexp_line (out, indent, "(elg\n");
(*indent)++;
write_sexp_keyparm (out, indent, "p", sk->skey[0]); iobuf_put (out,'\n');
write_sexp_keyparm (out, indent, "g", sk->skey[2]); iobuf_put (out,'\n');
write_sexp_keyparm (out, indent, "y", sk->skey[3]); iobuf_put (out,'\n');
write_sexp_keyparm (out, indent, "x", sk->skey[4]);
iobuf_put (out,')'); iobuf_put (out,'\n');
(*indent)--;
}
write_sexp_line (out, indent, "(attrib\n"); (*indent)++;
sprintf (tmpbuf, "(created \"%lu\"", (unsigned long)sk->timestamp);
write_sexp_line (out, indent, tmpbuf);
iobuf_put (out,')'); (*indent)--; /* close created */
iobuf_put (out,')'); (*indent)--; /* close attrib */
iobuf_put (out,')'); (*indent)--; /* close private-key */
if (pkt->pkttype != PKT_SECRET_KEY)
iobuf_put (out,')'), (*indent)--; /* close subkey */
iobuf_put (out,'\n');
return 0;
}
/* For some packet types we write them in a S-Exp like format. This is
still EXPERIMENTAL and subject to change. */
static int
build_sexp (iobuf_t out, PACKET *pkt, int *indent)
{
int rc;
switch (pkt->pkttype)
{
case PKT_SECRET_KEY:
case PKT_SECRET_SUBKEY:
rc = build_sexp_seckey (out, pkt, indent);
break;
default:
rc = 0;
break;
}
return rc;
}
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