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Fix erroneous "DNSSEC validated" state with non-DNSSEC upstream servers.

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When DNSEC validation is enabled, but a query is not validated
because it gets forwarded to a non-DNSEC-capable upstream
server, the rr_status array is not correctly cleared, with
the effect that the answer may be maked as DNSSEC validated
if the immediately preceding query was DNS signed and validated.
This commit is contained in:
Simon Kelley
2024-12-10 14:51:24 +00:00
parent 5483fead6a
commit 3b74df4f55
3 changed files with 57 additions and 43 deletions
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91
src/forward.c
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@@ -906,7 +906,7 @@ static void dnssec_validate(struct frec *forward, struct dns_header *header,
else
status = dnssec_validate_reply(now, header, plen, daemon->namebuff, daemon->keyname, &forward->class,
!option_bool(OPT_DNSSEC_IGN_NS) && (forward->sentto->flags & SERV_DO_DNSSEC),
NULL, NULL, NULL, &orig->validate_counter);
NULL, NULL, NULL, &orig->validate_counter);
if (STAT_ISEQUAL(status, STAT_ABANDONED))
log_resource = 1;
@@ -1220,10 +1220,15 @@ void reply_query(int fd, time_t now)
#ifdef HAVE_DNSSEC
if ((forward->sentto->flags & SERV_DO_DNSSEC) &&
option_bool(OPT_DNSSEC_VALID) &&
!(forward->flags & FREC_CHECKING_DISABLED))
dnssec_validate(forward, header, n, STAT_OK, now);
if (option_bool(OPT_DNSSEC_VALID))
{
/* Clear this in case we don't call dnssec_validate() below */
memset(daemon->rr_status, 0, sizeof(*daemon->rr_status) * daemon->rr_status_sz);
if ((forward->sentto->flags & SERV_DO_DNSSEC) &&
!(forward->flags & FREC_CHECKING_DISABLED))
dnssec_validate(forward, header, n, STAT_OK, now);
}
else
#endif
return_reply(now, forward, header, n, STAT_OK);
@@ -2491,46 +2496,52 @@ unsigned char *tcp_request(int confd, time_t now,
log_query_mysockaddr(F_SERVER | F_FORWARD, daemon->namebuff, &serv->addr, NULL, 0);
#ifdef HAVE_DNSSEC
if (option_bool(OPT_DNSSEC_VALID) && !checking_disabled && (master->flags & SERV_DO_DNSSEC))
if (option_bool(OPT_DNSSEC_VALID))
{
int keycount = daemon->limit[LIMIT_WORK]; /* Limit to number of DNSSEC questions, to catch loops and avoid filling cache. */
int validatecount = daemon->limit[LIMIT_CRYPTO];
int status = tcp_key_recurse(now, STAT_OK, header, m, 0, daemon->namebuff, daemon->keyname,
serv, have_mark, mark, &keycount, &validatecount);
char *result, *domain = "result";
/* Clear this in case we don't call tcp_key_recurse() below */
memset(daemon->rr_status, 0, sizeof(*daemon->rr_status) * daemon->rr_status_sz);
union all_addr a;
a.log.ede = ede = errflags_to_ede(status);
if (STAT_ISEQUAL(status, STAT_ABANDONED))
if (!checking_disabled && (master->flags & SERV_DO_DNSSEC))
{
result = "ABANDONED";
status = STAT_BOGUS;
}
else
result = (STAT_ISEQUAL(status, STAT_SECURE) ? "SECURE" : (STAT_ISEQUAL(status, STAT_INSECURE) ? "INSECURE" : "BOGUS"));
if (STAT_ISEQUAL(status, STAT_SECURE))
cache_secure = 1;
else if (STAT_ISEQUAL(status, STAT_BOGUS))
{
no_cache_dnssec = 1;
bogusanswer = 1;
int keycount = daemon->limit[LIMIT_WORK]; /* Limit to number of DNSSEC questions, to catch loops and avoid filling cache. */
int validatecount = daemon->limit[LIMIT_CRYPTO];
int status = tcp_key_recurse(now, STAT_OK, header, m, 0, daemon->namebuff, daemon->keyname,
serv, have_mark, mark, &keycount, &validatecount);
char *result, *domain = "result";
if (extract_request(header, m, daemon->namebuff, NULL))
domain = daemon->namebuff;
union all_addr a;
a.log.ede = ede = errflags_to_ede(status);
if (STAT_ISEQUAL(status, STAT_ABANDONED))
{
result = "ABANDONED";
status = STAT_BOGUS;
}
else
result = (STAT_ISEQUAL(status, STAT_SECURE) ? "SECURE" : (STAT_ISEQUAL(status, STAT_INSECURE) ? "INSECURE" : "BOGUS"));
if (STAT_ISEQUAL(status, STAT_SECURE))
cache_secure = 1;
else if (STAT_ISEQUAL(status, STAT_BOGUS))
{
no_cache_dnssec = 1;
bogusanswer = 1;
if (extract_request(header, m, daemon->namebuff, NULL))
domain = daemon->namebuff;
}
log_query(F_SECSTAT, domain, &a, result, 0);
if ((daemon->limit[LIMIT_CRYPTO] - validatecount) > (int)daemon->metrics[METRIC_CRYPTO_HWM])
daemon->metrics[METRIC_CRYPTO_HWM] = daemon->limit[LIMIT_CRYPTO] - validatecount;
if ((daemon->limit[LIMIT_WORK] - keycount) > (int)daemon->metrics[METRIC_WORK_HWM])
daemon->metrics[METRIC_WORK_HWM] = daemon->limit[LIMIT_WORK] - keycount;
/* include DNSSEC queries in the limit for a connection. */
query_count += daemon->limit[LIMIT_WORK] - keycount;
}
log_query(F_SECSTAT, domain, &a, result, 0);
if ((daemon->limit[LIMIT_CRYPTO] - validatecount) > (int)daemon->metrics[METRIC_CRYPTO_HWM])
daemon->metrics[METRIC_CRYPTO_HWM] = daemon->limit[LIMIT_CRYPTO] - validatecount;
if ((daemon->limit[LIMIT_WORK] - keycount) > (int)daemon->metrics[METRIC_WORK_HWM])
daemon->metrics[METRIC_WORK_HWM] = daemon->limit[LIMIT_WORK] - keycount;
/* include DNSSEC queries in the limit for a connection. */
query_count += daemon->limit[LIMIT_WORK] - keycount;
}
#endif