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BUG/MEDIUM: dumpstats: undefined behavior in stats_tlskeys_list()

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The function stats_tlskeys_list() can meet an undefined behavior when
called with appctx->st2 == STAT_ST_LIST, indeed the ref pointer is used
uninitialized.

However this function was using NULL in appctx->ctx.tlskeys.ref as a
flag to dump every tickets from every references.  A real flag
appctx->ctx.tlskeys.dump_all is now used for this behavior.

This patch delete the 'ref' variable and use appctx->ctx.tlskeys.ref
directly.
This commit is contained in:
William Lallemand 2016-06-14 17:45:18 +02:00 committed by Willy Tarreau
parent e984a0e4fb
commit cf9e788790
2 changed files with 15 additions and 14 deletions
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1
include/types/applet.h
View File

@ -106,6 +106,7 @@ struct appctx {
} map;
#if (defined SSL_CTRL_SET_TLSEXT_TICKET_KEY_CB && TLS_TICKETS_NO > 0)
struct {
int dump_all;
struct tls_keys_ref *ref;
} tlskeys;
#endif

28
src/dumpstats.c
View File

@ -1446,8 +1446,10 @@ static int stats_sock_parse_request(struct stream_interface *si, char *line)
}
else if (strcmp(args[1], "tls-keys") == 0) {
#if (defined SSL_CTRL_SET_TLSEXT_TICKET_KEY_CB && TLS_TICKETS_NO > 0)
appctx->ctx.tlskeys.dump_all = 0;
/* no parameter, shows only file list */
if (!*args[2]) {
appctx->ctx.tlskeys.dump_all = 1;
appctx->st2 = STAT_ST_INIT;
appctx->st0 = STAT_CLI_O_TLSK;
return 1;
@ -1456,6 +1458,7 @@ static int stats_sock_parse_request(struct stream_interface *si, char *line)
if (args[2][0] == '*') {
/* list every TLS ticket keys */
appctx->ctx.tlskeys.ref = NULL;
appctx->ctx.tlskeys.dump_all = 1;
} else {
appctx->ctx.tlskeys.ref = tlskeys_ref_lookup_ref(args[2]);
if(!appctx->ctx.tlskeys.ref) {
@ -6131,7 +6134,6 @@ static int stats_dump_full_sess_to_buffer(struct stream_interface *si, struct st
#if (defined SSL_CTRL_SET_TLSEXT_TICKET_KEY_CB && TLS_TICKETS_NO > 0)
static int stats_tlskeys_list(struct stream_interface *si) {
struct appctx *appctx = __objt_appctx(si->end);
struct tls_keys_ref *ref;
switch (appctx->st2) {
case STAT_ST_INIT:
@ -6151,44 +6153,42 @@ static int stats_tlskeys_list(struct stream_interface *si) {
return 0;
}
ref = appctx->ctx.tlskeys.ref;
/* Now, we start the browsing of the references lists.
* Note that the following call to LIST_ELEM return bad pointer. The only
* available field of this pointer is <list>. It is used with the function
* tlskeys_list_get_next() for retruning the first available entry
*/
if (ref == NULL) {
ref = LIST_ELEM(&tlskeys_reference, struct tls_keys_ref *, list);
ref = tlskeys_list_get_next(ref, &tlskeys_reference);
if (appctx->ctx.tlskeys.ref == NULL) {
appctx->ctx.tlskeys.ref = LIST_ELEM(&tlskeys_reference, struct tls_keys_ref *, list);
appctx->ctx.tlskeys.ref = tlskeys_list_get_next(appctx->ctx.tlskeys.ref, &tlskeys_reference);
}
appctx->st2 = STAT_ST_LIST;
/* fall through */
case STAT_ST_LIST:
while (ref) {
while (appctx->ctx.tlskeys.ref) {
int i;
int head = ref->tls_ticket_enc_index;
int head = appctx->ctx.tlskeys.ref->tls_ticket_enc_index;
chunk_reset(&trash);
if (appctx->st0 == STAT_CLI_O_TLSK_ENT)
chunk_appendf(&trash, "# ");
chunk_appendf(&trash, "%d (%s)\n", ref->unique_id,
ref->filename);
chunk_appendf(&trash, "%d (%s)\n", appctx->ctx.tlskeys.ref->unique_id,
appctx->ctx.tlskeys.ref->filename);
if (appctx->st0 == STAT_CLI_O_TLSK_ENT) {
for (i = 0; i < TLS_TICKETS_NO; i++) {
struct chunk *t2 = get_trash_chunk();
int b64_len;
chunk_reset(t2);
b64_len = a2base64((char *)(ref->tlskeys + (head + 2 + i) % TLS_TICKETS_NO),
b64_len = a2base64((char *)(appctx->ctx.tlskeys.ref->tlskeys + (head + 2 + i) % TLS_TICKETS_NO),
sizeof(struct tls_sess_key), t2->str, t2->size);
if (b64_len < 0)
return 0;
t2->len = b64_len;
chunk_appendf(&trash, "%d.%d %s\n", ref->unique_id, i, t2->str);
chunk_appendf(&trash, "%d.%d %s\n", appctx->ctx.tlskeys.ref->unique_id, i, t2->str);
}
}
if (bi_putchk(si_ic(si), &trash) == -1) {
@ -6199,11 +6199,11 @@ static int stats_tlskeys_list(struct stream_interface *si) {
return 0;
}
if (appctx->ctx.tlskeys.ref) /* don't display everything if don't null */
if (appctx->ctx.tlskeys.dump_all == 0) /* don't display everything if not necessary */
break;
/* get next list entry and check the end of the list */
ref = tlskeys_list_get_next(ref, &tlskeys_reference);
appctx->ctx.tlskeys.ref = tlskeys_list_get_next(appctx->ctx.tlskeys.ref, &tlskeys_reference);
}