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mirror of git://git.gnupg.org/gnupg.git synced 2024-10-29 19:48:43 +01:00
gnupg/g10/free-packet.c
Werner Koch 0f0c59d6ff
gpg: remove workaround for Libgcrypt < 1.8.6
* g10/free-packet.c (is_mpi_copy_broken): Remove.
2024-09-19 13:12:41 +02:00

568 lines
11 KiB
C

/* free-packet.c - cleanup stuff for packets
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003,
* 2005, 2010 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 <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "gpg.h"
#include "../common/util.h"
#include "packet.h"
#include "../common/iobuf.h"
#include "options.h"
/* This is a wrapper for mpi_copy which handles opaque MPIs with a
* NULL pointer as opaque data; e.g. gcry_mpi_set_opaque(a, NULL, 0).
* It seems that at least gcry_mpi_set_opaque_copy does not yet handle
* this correctly. */
static gcry_mpi_t
my_mpi_copy (gcry_mpi_t a)
{
if (a
&& gcry_mpi_get_flag (a, GCRYMPI_FLAG_OPAQUE)
&& !gcry_mpi_get_opaque (a, NULL))
return NULL;
return gcry_mpi_copy (a);
}
void
free_symkey_enc( PKT_symkey_enc *enc )
{
xfree(enc);
}
void
free_pubkey_enc( PKT_pubkey_enc *enc )
{
int n, i;
n = pubkey_get_nenc( enc->pubkey_algo );
if( !n )
mpi_release(enc->data[0]);
for(i=0; i < n; i++ )
mpi_release( enc->data[i] );
xfree(enc);
}
void
free_seckey_enc( PKT_signature *sig )
{
int n, i;
n = pubkey_get_nsig( sig->pubkey_algo );
if( !n )
mpi_release(sig->data[0]);
for(i=0; i < n; i++ )
mpi_release( sig->data[i] );
xfree(sig->revkey);
xfree(sig->hashed);
xfree(sig->unhashed);
xfree (sig->signers_uid);
xfree(sig);
}
void
release_public_key_parts (PKT_public_key *pk)
{
int n, i;
if (pk->seckey_info)
n = pubkey_get_nskey (pk->pubkey_algo);
else
n = pubkey_get_npkey (pk->pubkey_algo);
if (!n)
mpi_release (pk->pkey[0]);
for (i=0; i < n; i++ )
{
mpi_release (pk->pkey[i]);
pk->pkey[i] = NULL;
}
if (pk->seckey_info)
{
xfree (pk->seckey_info);
pk->seckey_info = NULL;
}
if (pk->prefs)
{
xfree (pk->prefs);
pk->prefs = NULL;
}
free_user_id (pk->user_id);
pk->user_id = NULL;
if (pk->revkey)
{
xfree(pk->revkey);
pk->revkey=NULL;
pk->numrevkeys=0;
}
if (pk->serialno)
{
xfree (pk->serialno);
pk->serialno = NULL;
}
if (pk->updateurl)
{
xfree (pk->updateurl);
pk->updateurl = NULL;
}
}
/* Free an allocated public key structure including all parts.
Passing NULL is allowed. */
void
free_public_key (PKT_public_key *pk)
{
if (pk)
{
release_public_key_parts (pk);
xfree(pk);
}
}
static subpktarea_t *
cp_subpktarea (subpktarea_t *s )
{
subpktarea_t *d;
if( !s )
return NULL;
d = xmalloc (sizeof (*d) + s->size - 1 );
d->size = s->size;
d->len = s->len;
memcpy (d->data, s->data, s->len);
return d;
}
/*
* Return a copy of the preferences
*/
prefitem_t *
copy_prefs (const prefitem_t *prefs)
{
size_t n;
prefitem_t *new;
if (!prefs)
return NULL;
for (n=0; prefs[n].type; n++)
;
new = xmalloc ( sizeof (*new) * (n+1));
for (n=0; prefs[n].type; n++) {
new[n].type = prefs[n].type;
new[n].value = prefs[n].value;
}
new[n].type = PREFTYPE_NONE;
new[n].value = 0;
return new;
}
/* Copy the public key S to D. If D is NULL allocate a new public key
* structure. Only the basic stuff is copied; not any ancillary
* data. */
PKT_public_key *
copy_public_key_basics (PKT_public_key *d, PKT_public_key *s)
{
int n, i;
if (!d)
d = xmalloc (sizeof *d);
memcpy (d, s, sizeof *d);
d->seckey_info = NULL;
d->user_id = NULL;
d->prefs = NULL;
n = pubkey_get_npkey (s->pubkey_algo);
i = 0;
if (!n)
d->pkey[i++] = my_mpi_copy (s->pkey[0]);
else
{
for (; i < n; i++ )
d->pkey[i] = my_mpi_copy (s->pkey[i]);
}
for (; i < PUBKEY_MAX_NSKEY; i++)
d->pkey[i] = NULL;
d->revkey = NULL;
d->serialno = NULL;
d->updateurl = NULL;
return d;
}
/* Copy the public key S to D. If D is NULL allocate a new public key
structure. If S has seckret key infos, only the public stuff is
copied. */
PKT_public_key *
copy_public_key (PKT_public_key *d, PKT_public_key *s)
{
d = copy_public_key_basics (d, s);
d->user_id = scopy_user_id (s->user_id);
d->prefs = copy_prefs (s->prefs);
if (!s->revkey && s->numrevkeys)
BUG();
if (s->numrevkeys)
{
d->revkey = xmalloc(sizeof(struct revocation_key)*s->numrevkeys);
memcpy(d->revkey,s->revkey,sizeof(struct revocation_key)*s->numrevkeys);
}
if (s->serialno)
d->serialno = xstrdup (s->serialno);
if (s->updateurl)
d->updateurl = xstrdup (s->updateurl);
return d;
}
PKT_signature *
copy_signature( PKT_signature *d, PKT_signature *s )
{
int n, i;
if( !d )
d = xmalloc(sizeof *d);
memcpy( d, s, sizeof *d );
n = pubkey_get_nsig( s->pubkey_algo );
if( !n )
d->data[0] = my_mpi_copy(s->data[0]);
else {
for(i=0; i < n; i++ )
d->data[i] = my_mpi_copy( s->data[i] );
}
d->hashed = cp_subpktarea (s->hashed);
d->unhashed = cp_subpktarea (s->unhashed);
if (s->signers_uid)
d->signers_uid = xstrdup (s->signers_uid);
if(s->numrevkeys)
{
d->revkey=NULL;
d->numrevkeys=0;
parse_revkeys(d);
}
return d;
}
/*
* shallow copy of the user ID
*/
PKT_user_id *
scopy_user_id (PKT_user_id *s)
{
if (s)
s->ref++;
return s;
}
void
free_comment( PKT_comment *rem )
{
xfree(rem);
}
void
free_attributes(PKT_user_id *uid)
{
if (!uid)
return;
xfree(uid->attribs);
xfree(uid->attrib_data);
uid->attribs=NULL;
uid->attrib_data=NULL;
uid->attrib_len=0;
}
void
free_user_id (PKT_user_id *uid)
{
if (!uid)
return;
log_assert (uid->ref > 0);
if (--uid->ref)
return;
free_attributes(uid);
xfree (uid->prefs);
xfree (uid->namehash);
xfree (uid->updateurl);
xfree (uid->mbox);
xfree (uid);
}
void
free_compressed( PKT_compressed *zd )
{
if (!zd)
return;
if (zd->buf)
{
/* We need to skip some bytes. Because don't have any
* information about the length, so we assume this is the last
* packet */
while (iobuf_read( zd->buf, NULL, 1<<30 ) != -1)
;
}
xfree(zd);
}
void
free_encrypted( PKT_encrypted *ed )
{
if (!ed)
return;
if (ed->buf)
{
/* We need to skip some bytes. */
if (ed->is_partial)
{
while (iobuf_read( ed->buf, NULL, 1<<30 ) != -1)
;
}
else
{
while (ed->len)
{
/* Skip the packet. */
int n = iobuf_read( ed->buf, NULL, ed->len );
if (n == -1)
ed->len = 0;
else
ed->len -= n;
}
}
}
xfree (ed);
}
void
free_plaintext( PKT_plaintext *pt )
{
if (!pt)
return;
if (pt->buf)
{ /* We need to skip some bytes. */
if (pt->is_partial)
{
while (iobuf_read( pt->buf, NULL, 1<<30 ) != -1)
;
}
else
{
while( pt->len )
{ /* Skip the packet. */
int n = iobuf_read( pt->buf, NULL, pt->len );
if (n == -1)
pt->len = 0;
else
pt->len -= n;
}
}
}
xfree (pt);
}
/****************
* Free the packet in PKT.
*/
void
free_packet (PACKET *pkt, parse_packet_ctx_t parsectx)
{
if (!pkt || !pkt->pkt.generic)
{
if (parsectx && parsectx->last_pkt.pkt.generic)
{
if (parsectx->free_last_pkt)
{
free_packet (&parsectx->last_pkt, NULL);
parsectx->free_last_pkt = 0;
}
parsectx->last_pkt.pkttype = 0;
parsectx->last_pkt.pkt.generic = NULL;
}
return;
}
if (DBG_MEMORY)
log_debug ("free_packet() type=%d\n", pkt->pkttype);
/* If we have a parser context holding PKT then do not free the
* packet but set a flag that the packet in the parser context is
* now a deep copy. */
if (parsectx && !parsectx->free_last_pkt
&& parsectx->last_pkt.pkttype == pkt->pkttype
&& parsectx->last_pkt.pkt.generic == pkt->pkt.generic)
{
parsectx->last_pkt = *pkt;
parsectx->free_last_pkt = 1;
pkt->pkt.generic = NULL;
return;
}
switch (pkt->pkttype)
{
case PKT_SIGNATURE:
free_seckey_enc (pkt->pkt.signature);
break;
case PKT_PUBKEY_ENC:
free_pubkey_enc (pkt->pkt.pubkey_enc);
break;
case PKT_SYMKEY_ENC:
free_symkey_enc (pkt->pkt.symkey_enc);
break;
case PKT_PUBLIC_KEY:
case PKT_PUBLIC_SUBKEY:
case PKT_SECRET_KEY:
case PKT_SECRET_SUBKEY:
free_public_key (pkt->pkt.public_key);
break;
case PKT_COMMENT:
free_comment (pkt->pkt.comment);
break;
case PKT_USER_ID:
free_user_id (pkt->pkt.user_id);
break;
case PKT_COMPRESSED:
free_compressed (pkt->pkt.compressed);
break;
case PKT_ENCRYPTED:
case PKT_ENCRYPTED_MDC:
case PKT_ENCRYPTED_AEAD:
free_encrypted (pkt->pkt.encrypted);
break;
case PKT_PLAINTEXT:
free_plaintext (pkt->pkt.plaintext);
break;
default:
xfree (pkt->pkt.generic);
break;
}
pkt->pkt.generic = NULL;
}
/****************
* returns 0 if they match.
*/
int
cmp_public_keys( PKT_public_key *a, PKT_public_key *b )
{
int n, i;
if( a->timestamp != b->timestamp )
return -1;
if( a->version < 4 && a->expiredate != b->expiredate )
return -1;
if( a->pubkey_algo != b->pubkey_algo )
return -1;
n = pubkey_get_npkey( b->pubkey_algo );
if( !n ) { /* unknown algorithm, rest is in opaque MPI */
if( mpi_cmp( a->pkey[0], b->pkey[0] ) )
return -1; /* can't compare due to unknown algorithm */
} else {
for(i=0; i < n; i++ ) {
if( mpi_cmp( a->pkey[i], b->pkey[i] ) )
return -1;
}
}
return 0;
}
int
cmp_signatures( PKT_signature *a, PKT_signature *b )
{
int n, i;
if( a->keyid[0] != b->keyid[0] )
return -1;
if( a->keyid[1] != b->keyid[1] )
return -1;
if( a->pubkey_algo != b->pubkey_algo )
return -1;
n = pubkey_get_nsig( a->pubkey_algo );
if( !n )
return -1; /* can't compare due to unknown algorithm */
for(i=0; i < n; i++ ) {
if( mpi_cmp( a->data[i] , b->data[i] ) )
return -1;
}
return 0;
}
/****************
* Returns: true if the user ids do not match
*/
int
cmp_user_ids( PKT_user_id *a, PKT_user_id *b )
{
int res=1;
if( a == b )
return 0;
if( a->attrib_data && b->attrib_data )
{
res = a->attrib_len - b->attrib_len;
if( !res )
res = memcmp( a->attrib_data, b->attrib_data, a->attrib_len );
}
else if( !a->attrib_data && !b->attrib_data )
{
res = a->len - b->len;
if( !res )
res = memcmp( a->name, b->name, a->len );
}
return res;
}