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Restore ability to answer non-recursive requests

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Instead, check only local configured entries are answered without
rdbit set. All cached replies are still denied, but locally configured
names are available with both recursion and without it.

Fixes commit 4139298d28 unintended
behaviour.
This commit is contained in:
Petr Menšík authored and Simon Kelley committed 2020-02-11 21:01:28 +00:00
1 parent 306888afb3
commit 29ae308398
1 file changed
+14 -14
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src/rfc1035.c
+14 -14
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@@ -1301,7 +1301,11 @@ static unsigned long crec_ttl(struct crec *crecp, time_t now)
else
return daemon->max_ttl;
}
static int cache_validated(const struct crec *crecp)
{
return (option_bool(OPT_DNSSEC_VALID) && !(crecp->flags & F_DNSSECOK));
}
/* return zero if we can't answer from cache, or packet size if we can */
size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
@@ -1320,12 +1324,12 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
int nxdomain = 0, notimp = 0, auth = 1, trunc = 0, sec_data = 1;
struct mx_srv_record *rec;
size_t len;
int rd_bit = (header->hb3 & HB3_RD);
/* never answer queries with RD unset, to avoid cache snooping. */
if (!(header->hb3 & HB3_RD) ||
ntohs(header->ancount) != 0 ||
if (ntohs(header->ancount) != 0 ||
ntohs(header->nscount) != 0 ||
ntohs(header->qdcount) == 0 ||
ntohs(header->qdcount) == 0 ||
OPCODE(header) != QUERY )
return 0;
@@ -1372,9 +1376,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
/* If the client asked for DNSSEC don't use cached data. */
if ((crecp->flags & (F_HOSTS | F_DHCP | F_CONFIG)) ||
!do_bit ||
(option_bool(OPT_DNSSEC_VALID) && !(crecp->flags & F_DNSSECOK)))
(rd_bit && (!do_bit || cache_validated(crecp))))
{
if (crecp->flags & F_CONFIG || qtype == T_CNAME)
ans = 1;
@@ -1543,9 +1545,8 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
/* Don't use cache when DNSSEC data required, unless we know that
the zone is unsigned, which implies that we're doing
validation. */
if ((crecp->flags & (F_HOSTS | F_DHCP | F_CONFIG)) ||
!do_bit ||
(option_bool(OPT_DNSSEC_VALID) && !(crecp->flags & F_DNSSECOK)))
if ((crecp->flags & (F_HOSTS | F_DHCP | F_CONFIG)) ||
(rd_bit && (!do_bit || cache_validated(crecp)) ))
{
do
{
@@ -1726,8 +1727,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
/* If the client asked for DNSSEC don't use cached data. */
if ((crecp->flags & (F_HOSTS | F_DHCP | F_CONFIG)) ||
!do_bit ||
(option_bool(OPT_DNSSEC_VALID) && !(crecp->flags & F_DNSSECOK)))
(rd_bit && (!do_bit || cache_validated(crecp)) ))
do
{
/* don't answer wildcard queries with data not from /etc/hosts
@@ -1808,7 +1808,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
}
}
if (!found && (option_bool(OPT_SELFMX) || option_bool(OPT_LOCALMX)) &&
if (!found && (option_bool(OPT_SELFMX) || option_bool(OPT_LOCALMX)) &&
cache_find_by_name(NULL, name, now, F_HOSTS | F_DHCP | F_NO_RR))
{
ans = 1;
@@ -1870,7 +1870,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
if (!found)
{
if ((crecp = cache_find_by_name(NULL, name, now, F_SRV | (dryrun ? F_NO_RR : 0))) &&
(!do_bit || (option_bool(OPT_DNSSEC_VALID) && !(crecp->flags & F_DNSSECOK))))
rd_bit && (!do_bit || (option_bool(OPT_DNSSEC_VALID) && !(crecp->flags & F_DNSSECOK))))
{
if (!(crecp->flags & F_DNSSECOK))
sec_data = 0;