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ITS#9202 limit depth of nested filters

Browse source 
Using a hardcoded limit for now; no reasonable apps
should ever run into it.
This commit is contained in:
Howard Chu 2020-04-16 01:08:19 +01:00 committed by Quanah Gibson-Mount
parent af5b31b2a7
commit d38d48fc8f
1 changed files with 32 additions and 9 deletions
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41
servers/slapd/filter.c
View file

@ -37,11 +37,16 @@
const Filter *slap_filter_objectClass_pres;
const struct berval *slap_filterstr_objectClass_pres;
#ifndef SLAPD_MAX_FILTER_DEPTH
#define SLAPD_MAX_FILTER_DEPTH 5000
#endif
static int get_filter_list(
Operation *op,
BerElement *ber,
Filter **f,
const char **text );
const char **text,
int depth );
static int get_ssa(
Operation *op,
@ -80,12 +85,13 @@ filter_destroy( void )
return;
}
int
get_filter(
static int
get_filter0(
Operation *op,
BerElement *ber,
Filter **filt,
const char **text )
const char **text,
int depth )
{
ber_tag_t tag;
ber_len_t len;
@ -126,6 +132,11 @@ get_filter(
*
*/
if( depth > SLAPD_MAX_FILTER_DEPTH ) {
*text = "filter nested too deeply";
return SLAPD_DISCONNECT;
}
tag = ber_peek_tag( ber, &len );
if( tag == LBER_ERROR ) {
@ -221,7 +232,7 @@ get_filter(
case LDAP_FILTER_AND:
Debug( LDAP_DEBUG_FILTER, "AND\n" );
err = get_filter_list( op, ber, &f.f_and, text );
err = get_filter_list( op, ber, &f.f_and, text, depth+1 );
if ( err != LDAP_SUCCESS ) {
break;
}
@ -234,7 +245,7 @@ get_filter(
case LDAP_FILTER_OR:
Debug( LDAP_DEBUG_FILTER, "OR\n" );
err = get_filter_list( op, ber, &f.f_or, text );
err = get_filter_list( op, ber, &f.f_or, text, depth+1 );
if ( err != LDAP_SUCCESS ) {
break;
}
@ -248,7 +259,7 @@ get_filter(
case LDAP_FILTER_NOT:
Debug( LDAP_DEBUG_FILTER, "NOT\n" );
(void) ber_skip_tag( ber, &len );
err = get_filter( op, ber, &f.f_not, text );
err = get_filter0( op, ber, &f.f_not, text, depth+1 );
if ( err != LDAP_SUCCESS ) {
break;
}
@ -311,10 +322,22 @@ get_filter(
return( err );
}
int
get_filter(
Operation *op,
BerElement *ber,
Filter **filt,
const char **text )
{
return get_filter0( op, ber, filt, text, 0 );
}
static int
get_filter_list( Operation *op, BerElement *ber,
Filter **f,
const char **text )
const char **text,
int depth )
{
Filter **new;
int err;
@ -328,7 +351,7 @@ get_filter_list( Operation *op, BerElement *ber,
tag != LBER_DEFAULT;
tag = ber_next_element( ber, &len, last ) )
{
err = get_filter( op, ber, new, text );
err = get_filter0( op, ber, new, text, depth );
if ( err != LDAP_SUCCESS )
return( err );
new = &(*new)->f_next;