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gpg: Extend free_packet to handle a packet parser context.

Browse Source 
* g10/packet.h (struct parse_packet_ctx_s): Add fields LAST_PKT and
FREE_LAST_PKT.
(init_parse_packet): Clear them.
(deinit_parse_packet): New macro.  Change all users if
init_parse_packet to also call this macro.
* g10/free-packet.c (free_packet): Add arg PARSECTX and handle shallow
packet copies in the context.  Change all callers.
* g10/parse-packet.c (parse): Store certain packets in the parse
context.
--

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2017-03-29 11:57:40 +02:00
parent ba57f8302a
commit afa8680908
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
12 changed files with 124 additions and 53 deletions
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4
g10/encrypt.c
View File

@ -394,7 +394,7 @@ encrypt_simple (const char *filename, int mode, int use_seskey)
}
if (pt)
pt->buf = NULL;
free_packet (&pkt);
free_packet (&pkt, NULL);
xfree (cfx.dek);
xfree (s2k);
release_armor_context (afx);
@ -755,7 +755,7 @@ encrypt_crypt (ctrl_t ctrl, int filefd, const char *filename,
}
if (pt)
pt->buf = NULL;
free_packet (&pkt);
free_packet (&pkt, NULL);
xfree (cfx.dek);
xfree (symkey_dek);
xfree (symkey_s2k);

26
g10/free-packet.c
View File

@ -394,18 +394,40 @@ free_plaintext( PKT_plaintext *pt )
xfree (pt);
}
/****************
* Free the packet in PKT.
*/
void
free_packet (PACKET *pkt)
free_packet (PACKET *pkt, parse_packet_ctx_t parsectx)
{
if (!pkt || !pkt->pkt.generic)
return;
{
if (parsectx && parsectx->last_pkt)
{
if (parsectx->free_last_pkt)
{
free_packet (parsectx->last_pkt, NULL);
parsectx->free_last_pkt = 0;
}
parsectx->last_pkt = 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->last_pkt == pkt && !parsectx->free_last_pkt)
{
parsectx->free_last_pkt = 1;
pkt->pkt.generic = NULL;
return;
}
switch (pkt->pkttype)
{
case PKT_SIGNATURE:

13
g10/import.c
View File

@ -790,7 +790,7 @@ read_block( IOBUF a, PACKET **pending_pkt, kbnode_t *ret_root, int *r_v3keys)
{
in_v3key = 1;
++*r_v3keys;
free_packet (pkt);
free_packet (pkt, &parsectx);
init_packet (pkt);
continue;
}
@ -804,7 +804,7 @@ read_block( IOBUF a, PACKET **pending_pkt, kbnode_t *ret_root, int *r_v3keys)
rc = GPG_ERR_INV_KEYRING;
goto ready;
}
free_packet( pkt );
free_packet (pkt, &parsectx);
init_packet(pkt);
continue;
}
@ -812,7 +812,7 @@ read_block( IOBUF a, PACKET **pending_pkt, kbnode_t *ret_root, int *r_v3keys)
if (in_v3key && !(pkt->pkttype == PKT_PUBLIC_KEY
|| pkt->pkttype == PKT_SECRET_KEY))
{
free_packet( pkt );
free_packet (pkt, &parsectx);
init_packet(pkt);
continue;
}
@ -843,7 +843,7 @@ read_block( IOBUF a, PACKET **pending_pkt, kbnode_t *ret_root, int *r_v3keys)
pkt->pkt.compressed->buf = NULL;
push_compress_filter2(a,cfx,pkt->pkt.compressed->algorithm,1);
}
free_packet( pkt );
free_packet (pkt, &parsectx);
init_packet(pkt);
break;
@ -851,7 +851,7 @@ read_block( IOBUF a, PACKET **pending_pkt, kbnode_t *ret_root, int *r_v3keys)
/* Skip those packets unless we are in restore mode. */
if ((opt.import_options & IMPORT_RESTORE))
goto x_default;
free_packet( pkt );
free_packet (pkt, &parsectx);
init_packet(pkt);
break;
@ -887,7 +887,8 @@ read_block( IOBUF a, PACKET **pending_pkt, kbnode_t *ret_root, int *r_v3keys)
release_kbnode( root );
else
*ret_root = root;
free_packet( pkt );
free_packet (pkt, &parsectx);
deinit_parse_packet (&parsectx);
xfree( pkt );
return rc;
}

8
g10/kbnode.c
View File

@ -117,8 +117,8 @@ release_kbnode( KBNODE n )
while( n ) {
n2 = n->next;
if( !is_cloned_kbnode(n) ) {
free_packet( n->pkt );
xfree( n->pkt );
free_packet (n->pkt, NULL);
xfree( n->pkt );
}
free_node( n );
n = n2;
@ -288,7 +288,7 @@ commit_kbnode( KBNODE *root )
else
nl->next = n->next;
if( !is_cloned_kbnode(n) ) {
free_packet( n->pkt );
free_packet (n->pkt, NULL);
xfree( n->pkt );
}
free_node( n );
@ -312,7 +312,7 @@ remove_kbnode( KBNODE *root, KBNODE node )
else
nl->next = n->next;
if( !is_cloned_kbnode(n) ) {
free_packet( n->pkt );
free_packet (n->pkt, NULL);
xfree( n->pkt );
}
free_node( n );

7
g10/keydb.c
View File

@ -1180,7 +1180,7 @@ parse_keyblock_image (iobuf_t iobuf, int pk_no, int uid_no,
{
if (gpg_err_code (err) == GPG_ERR_UNKNOWN_PACKET)
{
free_packet (pkt);
free_packet (pkt, &parsectx);
init_packet (pkt);
continue;
}
@ -1209,7 +1209,7 @@ parse_keyblock_image (iobuf_t iobuf, int pk_no, int uid_no,
the other GPG specific packets don't make sense either. */
log_error ("skipped packet of type %d in keybox\n",
(int)pkt->pkttype);
free_packet(pkt);
free_packet(pkt, &parsectx);
init_packet(pkt);
continue;
}
@ -1311,7 +1311,8 @@ parse_keyblock_image (iobuf_t iobuf, int pk_no, int uid_no,
release_kbnode (keyblock);
else
*r_keyblock = keyblock;
free_packet (pkt);
free_packet (pkt, &parsectx);
deinit_parse_packet (&parsectx);
xfree (pkt);
return err;
}

19
g10/keyedit.c
View File

@ -2467,7 +2467,8 @@ keyedit_menu (ctrl_t ctrl, const char *username, strlist_t locusr,
init_packet (pkt);
init_parse_packet (&parsectx, a);
err = parse_packet (&parsectx, pkt);
iobuf_close (a);
deinit_parse_packet (&parsectx);
iobuf_close (a);
iobuf_ioctl (NULL, IOBUF_IOCTL_INVALIDATE_CACHE, 0, (char *) fname);
if (!err && pkt->pkttype != PKT_SECRET_KEY
&& pkt->pkttype != PKT_SECRET_SUBKEY)
@ -2477,7 +2478,7 @@ keyedit_menu (ctrl_t ctrl, const char *username, strlist_t locusr,
tty_printf (_("Error reading backup key from '%s': %s\n"),
fname, gpg_strerror (err));
xfree (fname);
free_packet (pkt);
free_packet (pkt, NULL);
xfree (pkt);
break;
}
@ -5008,7 +5009,7 @@ menu_expire (kbnode_t pub_keyblock, int force_mainkey, u32 newexpiration)
newpkt = xmalloc_clear (sizeof *newpkt);
newpkt->pkttype = PKT_SIGNATURE;
newpkt->pkt.signature = newsig;
free_packet (node->pkt);
free_packet (node->pkt, NULL);
xfree (node->pkt);
node->pkt = newpkt;
sub_pk = NULL;
@ -5114,7 +5115,7 @@ menu_changeusage (kbnode_t keyblock)
newpkt = xmalloc_clear (sizeof *newpkt);
newpkt->pkttype = PKT_SIGNATURE;
newpkt->pkt.signature = newsig;
free_packet (node->pkt);
free_packet (node->pkt, NULL);
xfree (node->pkt);
node->pkt = newpkt;
sub_pk = NULL;
@ -5213,7 +5214,7 @@ menu_backsign (KBNODE pub_keyblock)
newpkt = xmalloc_clear (sizeof (*newpkt));
newpkt->pkttype = PKT_SIGNATURE;
newpkt->pkt.signature = newsig;
free_packet (sig_pk->pkt);
free_packet (sig_pk->pkt, NULL);
xfree (sig_pk->pkt);
sig_pk->pkt = newpkt;
@ -5371,7 +5372,7 @@ menu_set_primary_uid (KBNODE pub_keyblock)
newpkt = xmalloc_clear (sizeof *newpkt);
newpkt->pkttype = PKT_SIGNATURE;
newpkt->pkt.signature = newsig;
free_packet (node->pkt);
free_packet (node->pkt, NULL);
xfree (node->pkt);
node->pkt = newpkt;
modified = 1;
@ -5460,7 +5461,7 @@ menu_set_preferences (KBNODE pub_keyblock)
newpkt = xmalloc_clear (sizeof *newpkt);
newpkt->pkttype = PKT_SIGNATURE;
newpkt->pkt.signature = newsig;
free_packet (node->pkt);
free_packet (node->pkt, NULL);
xfree (node->pkt);
node->pkt = newpkt;
modified = 1;
@ -5596,7 +5597,7 @@ menu_set_keyserver_url (const char *url, KBNODE pub_keyblock)
newpkt = xmalloc_clear (sizeof *newpkt);
newpkt->pkttype = PKT_SIGNATURE;
newpkt->pkt.signature = newsig;
free_packet (node->pkt);
free_packet (node->pkt, NULL);
xfree (node->pkt);
node->pkt = newpkt;
modified = 1;
@ -5797,7 +5798,7 @@ menu_set_notation (const char *string, KBNODE pub_keyblock)
newpkt = xmalloc_clear (sizeof *newpkt);
newpkt->pkttype = PKT_SIGNATURE;
newpkt->pkt.signature = newsig;
free_packet (node->pkt);
free_packet (node->pkt, NULL);
xfree (node->pkt);
node->pkt = newpkt;
modified = 1;

2
g10/keygen.c
View File

@ -867,7 +867,7 @@ make_backsig (PKT_signature *sig, PKT_public_key *pk,
backsig_pkt.pkttype = PKT_SIGNATURE;
backsig_pkt.pkt.signature = backsig;
err = build_packet (backsig_out, &backsig_pkt);
free_packet (&backsig_pkt);
free_packet (&backsig_pkt, NULL);
if (err)
log_error ("build_packet failed for backsig: %s\n", gpg_strerror (err));
else

20
g10/keyring.c
View File

@ -415,7 +415,7 @@ keyring_get_keyblock (KEYRING_HANDLE hd, KBNODE *ret_kb)
while ((rc=parse_packet (&parsectx, pkt)) != -1) {
hd->found.n_packets++;
if (gpg_err_code (rc) == GPG_ERR_UNKNOWN_PACKET) {
free_packet (pkt);
free_packet (pkt, &parsectx);
init_packet (pkt);
continue;
}
@ -461,7 +461,7 @@ keyring_get_keyblock (KEYRING_HANDLE hd, KBNODE *ret_kb)
default:
log_error ("skipped packet of type %d in keyring\n",
(int)pkt->pkttype);
free_packet(pkt);
free_packet(pkt, &parsectx);
init_packet(pkt);
continue;
}
@ -490,7 +490,7 @@ keyring_get_keyblock (KEYRING_HANDLE hd, KBNODE *ret_kb)
/* Reset LASTNODE, so that we set the cache status only from
* the ring trust packet immediately following a signature. */
lastnode = NULL;
free_packet(pkt);
free_packet(pkt, &parsectx);
init_packet(pkt);
continue;
}
@ -542,7 +542,8 @@ keyring_get_keyblock (KEYRING_HANDLE hd, KBNODE *ret_kb)
}
*ret_kb = keyblock;
}
free_packet (pkt);
free_packet (pkt, &parsectx);
deinit_parse_packet (&parsectx);
xfree (pkt);
iobuf_close(a);
@ -1132,7 +1133,7 @@ keyring_search (KEYRING_HANDLE hd, KEYDB_SEARCH_DESC *desc,
rc = search_packet (&parsectx, &pkt, &offset, need_uid);
if (ignore_legacy && gpg_err_code (rc) == GPG_ERR_LEGACY_KEY)
{
free_packet (&pkt);
free_packet (&pkt, &parsectx);
continue;
}
if (rc)
@ -1146,7 +1147,7 @@ keyring_search (KEYRING_HANDLE hd, KEYDB_SEARCH_DESC *desc,
}
if (initial_skip)
{
free_packet (&pkt);
free_packet (&pkt, &parsectx);
continue;
}
@ -1228,7 +1229,7 @@ keyring_search (KEYRING_HANDLE hd, KEYDB_SEARCH_DESC *desc,
goto found;
}
}
free_packet (&pkt);
free_packet (&pkt, &parsectx);
continue;
found:
if (rc)
@ -1255,7 +1256,7 @@ keyring_search (KEYRING_HANDLE hd, KEYDB_SEARCH_DESC *desc,
}
if (n == ndesc)
goto real_found;
free_packet (&pkt);
free_packet (&pkt, &parsectx);
}
real_found:
if (!rc)
@ -1309,7 +1310,8 @@ keyring_search (KEYRING_HANDLE hd, KEYDB_SEARCH_DESC *desc,
hd->current.error = rc;
}
free_packet(&pkt);
free_packet (&pkt, &parsectx);
deinit_parse_packet (&parsectx);
set_packet_list_mode(save_mode);
return rc;
}

17
g10/mainproc.c
View File

@ -358,7 +358,7 @@ proc_symkey_enc (CTX c, PACKET *pkt)
leave:
c->symkeys++;
free_packet (pkt);
free_packet (pkt, NULL);
}
@ -456,7 +456,7 @@ proc_pubkey_enc (ctrl_t ctrl, CTX c, PACKET *pkt)
log_info (_("public key encrypted data: good DEK\n"));
}
free_packet(pkt);
free_packet(pkt, NULL);
}
@ -657,7 +657,7 @@ proc_encrypted (CTX c, PACKET *pkt)
xfree (c->dek);
c->dek = NULL;
free_packet (pkt);
free_packet (pkt, NULL);
c->last_was_session_key = 0;
write_status (STATUS_END_DECRYPTION);
}
@ -774,7 +774,7 @@ proc_plaintext( CTX c, PACKET *pkt )
if (rc)
log_error ("handle plaintext failed: %s\n", gpg_strerror (rc));
free_packet(pkt);
free_packet (pkt, NULL);
c->last_was_session_key = 0;
/* We add a marker control packet instead of the plaintext packet.
@ -837,7 +837,7 @@ proc_compressed (CTX c, PACKET *pkt)
else if (rc)
log_error ("uncompressing failed: %s\n", gpg_strerror (rc));
free_packet(pkt);
free_packet (pkt, NULL);
c->last_was_session_key = 0;
return rc;
}
@ -1348,7 +1348,7 @@ do_proc_packets (ctrl_t ctrl, CTX c, iobuf_t a)
any_data = 1;
if (rc)
{
free_packet (pkt);
free_packet (pkt, &parsectx);
/* Stop processing when an invalid packet has been encountered
* but don't do so when we are doing a --list-packets. */
if (gpg_err_code (rc) == GPG_ERR_INV_PACKET
@ -1466,7 +1466,7 @@ do_proc_packets (ctrl_t ctrl, CTX c, iobuf_t a)
init_packet (pkt);
}
else
free_packet(pkt);
free_packet (pkt, &parsectx);
}
if (rc == GPG_ERR_INV_PACKET)
@ -1481,7 +1481,8 @@ do_proc_packets (ctrl_t ctrl, CTX c, iobuf_t a)
leave:
release_list (c);
xfree(c->dek);
free_packet (pkt);
free_packet (pkt, &parsectx);
deinit_parse_packet (&parsectx);
xfree (pkt);
free_md_filter_context (&c->mfx);
return rc;

17
g10/packet.h
View File

@ -596,13 +596,22 @@ int set_packet_list_mode( int mode );
/* A context used with parse_packet. */
struct parse_packet_ctx_s
{
iobuf_t inp; /* The input stream with the packets. */
iobuf_t inp; /* The input stream with the packets. */
PACKET *last_pkt; /* The last parsed packet. */
int free_last_pkt; /* Indicates that LAST_PKT must be freed. */
};
typedef struct parse_packet_ctx_s *parse_packet_ctx_t;
#define init_parse_packet(a,i) do { (a)->inp = (i); \
/**/ } while (0)
#define init_parse_packet(a,i) do { \
(a)->inp = (i); \
(a)->last_pkt = NULL; \
(a)->free_last_pkt = 0; \
} while (0)
#define deinit_parse_packet(a) do { \
if ((a)->free_last_pkt) \
free_packet (NULL, (a)); \
} while (0)
#if DEBUG_PARSE_PACKET
@ -803,7 +812,7 @@ void free_public_key( PKT_public_key *key );
void free_attributes(PKT_user_id *uid);
void free_user_id( PKT_user_id *uid );
void free_comment( PKT_comment *rem );
void free_packet( PACKET *pkt );
void free_packet (PACKET *pkt, parse_packet_ctx_t parsectx);
prefitem_t *copy_prefs (const prefitem_t *prefs);
PKT_public_key *copy_public_key( PKT_public_key *d, PKT_public_key *s );
PKT_signature *copy_signature( PKT_signature *d, PKT_signature *s );

38
g10/parse-packet.c
View File

@ -352,6 +352,9 @@ dbg_copy_all_packets (iobuf_t inp, iobuf_t out, const char *dbg_f, int dbg_l)
(rc =
parse (&parsectx, &pkt, 0, NULL, &skip, out, 0, "copy",
dbg_f, dbg_l)));
deinit_parse_packet (&parsectx);
return rc;
}
#else /*!DEBUG_PARSE_PACKET*/
@ -372,6 +375,9 @@ copy_all_packets (iobuf_t inp, iobuf_t out)
init_packet (&pkt);
}
while (!(rc = parse (&parsectx, &pkt, 0, NULL, &skip, out, 0)));
deinit_parse_packet (&parsectx);
return rc;
}
#endif /*!DEBUG_PARSE_PACKET*/
@ -397,11 +403,17 @@ dbg_copy_some_packets (iobuf_t inp, iobuf_t out, off_t stopoff,
do
{
if (iobuf_tell (inp) >= stopoff)
return 0;
{
deinit_parse_packet (&parsectx);
return 0;
}
init_packet (&pkt);
}
while (!(rc = parse (&parsectx, &pkt, 0, NULL, &skip, out, 0,
"some", dbg_f, dbg_l)));
deinit_parse_packet (&parsectx);
return rc;
}
#else /*!DEBUG_PARSE_PACKET*/
@ -418,10 +430,16 @@ copy_some_packets (iobuf_t inp, iobuf_t out, off_t stopoff)
do
{
if (iobuf_tell (inp) >= stopoff)
return 0;
{
deinit_parse_packet (&parsectx);
return 0;
}
init_packet (&pkt);
}
while (!(rc = parse (&parsectx, &pkt, 0, NULL, &skip, out, 0)));
deinit_parse_packet (&parsectx);
return rc;
}
#endif /*!DEBUG_PARSE_PACKET*/
@ -447,6 +465,9 @@ dbg_skip_some_packets (iobuf_t inp, unsigned n, const char *dbg_f, int dbg_l)
rc = parse (&parsectx, &pkt, 0, NULL, &skip, NULL, 1, "skip",
dbg_f, dbg_l);
}
deinit_parse_packet (&parsectx);
return rc;
}
#else /*!DEBUG_PARSE_PACKET*/
@ -465,6 +486,9 @@ skip_some_packets (iobuf_t inp, unsigned int n)
init_packet (&pkt);
rc = parse (&parsectx, &pkt, 0, NULL, &skip, NULL, 1);
}
deinit_parse_packet (&parsectx);
return rc;
}
#endif /*!DEBUG_PARSE_PACKET*/
@ -804,6 +828,16 @@ parse (parse_packet_ctx_t ctx, PACKET *pkt, int onlykeypkts, off_t * retpos,
break;
}
/* Store a shallow copy of certain packets in the context. */
if (!rc && (pkttype == PKT_PUBLIC_KEY
|| pkttype == PKT_SECRET_KEY
|| pkttype == PKT_USER_ID
|| pkttype == PKT_ATTRIBUTE
|| pkttype == PKT_SIGNATURE))
ctx->last_pkt = pkt;
else
ctx->last_pkt = NULL;
leave:
/* FIXME: We leak in case of an error (see the xmalloc's above). */
if (!rc && iobuf_error (inp))

6
g10/sign.c
View File

@ -575,7 +575,7 @@ write_onepass_sig_packets (SK_LIST sk_list, IOBUF out, int sigclass )
pkt.pkttype = PKT_ONEPASS_SIG;
pkt.pkt.onepass_sig = ops;
rc = build_packet (out, &pkt);
free_packet (&pkt);
free_packet (&pkt, NULL);
if (rc) {
log_error ("build onepass_sig packet failed: %s\n",
gpg_strerror (rc));
@ -645,7 +645,7 @@ write_plaintext_packet (IOBUF out, IOBUF inp, const char *fname, int ptmode)
log_error ("build_packet(PLAINTEXT) failed: %s\n",
gpg_strerror (rc) );
pt->buf = NULL;
free_packet (&pkt);
free_packet (&pkt, NULL);
}
else {
byte copy_buffer[4096];
@ -732,7 +732,7 @@ write_signature_packets (SK_LIST sk_list, IOBUF out, gcry_md_hd_t hash,
rc = build_packet (out, &pkt);
if (!rc && is_status_enabled())
print_status_sig_created (pk, sig, status_letter);
free_packet (&pkt);
free_packet (&pkt, NULL);
if (rc)
log_error ("build signature packet failed: %s\n",
gpg_strerror (rc));