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Fix DNSSEC caching problems: incomplete RRSIG RRsets.

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This commit is contained in:
Simon Kelley
2014-02-10 10:35:42 +00:00
parent e243c072b5
commit c8ca33f810
3 changed files with 60 additions and 63 deletions
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2
src/cache.c
View File

@@ -460,7 +460,7 @@ struct crec *cache_insert(char *name, struct all_addr *addr,
return NULL;
/* First remove any expired entries and entries for the name/address we
are currently inserting. Fail is we attempt to delete a name from
are currently inserting. Fail if we attempt to delete a name from
/etc/hosts or DHCP. */
if (!cache_scan_free(name, addr, now, flags))
{

1
src/dnssec.c
View File

@@ -1168,6 +1168,7 @@ int dnssec_validate_reply(time_t now, struct dns_header *header, size_t plen, ch
type_covered == T_DNSKEY || type_covered == T_PTR))
{
a.addr.dnssec.type = type_covered;
a.addr.dnssec.class = class1;
algo = *p2++;
p2 += 13; /* labels, orig_ttl, expiration, inception */

120
src/rfc1035.c
View File

@@ -1551,37 +1551,33 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
}
#ifdef HAVE_DNSSEC
if (option_bool(OPT_DNSSEC_VALID) && (qtype == T_DNSKEY || qtype == T_DS || qtype == T_RRSIG))
if (option_bool(OPT_DNSSEC_VALID) && (qtype == T_DNSKEY || qtype == T_DS))
{
int gotone = 0, have_rrsig = 0;
int gotone = 0;
struct blockdata *keydata;
/* Do we have RRSIG? Can't do DS or DNSKEY otherwise. */
crecp = NULL;
while ((crecp = cache_find_by_name(crecp, name, now, F_DNSKEY | F_DS)))
if (crecp->uid == qclass && (qtype == T_RRSIG || crecp->addr.sig.type_covered == qtype))
{
have_rrsig = 1;
break;
}
if (qtype == T_RRSIG && have_rrsig)
if (sec_reqd)
{
ans = gotone = 1;
auth = 0;
}
else if (qtype == T_DS && have_rrsig)
{
auth = 0;
crecp = NULL;
while ((crecp = cache_find_by_name(crecp, name, now, F_DS)))
if (crecp->uid == qclass)
{
ans = gotone = 1;
if (!dryrun && (keydata = blockdata_retrieve(crecp->addr.ds.keydata, crecp->addr.ds.keylen, NULL)))
{
struct all_addr a;
a.addr.keytag = crecp->addr.ds.keytag;
while ((crecp = cache_find_by_name(crecp, name, now, F_DNSKEY | F_DS)))
if (crecp->uid == qclass && crecp->addr.sig.type_covered == qtype)
break;
}
if (!sec_reqd || crecp)
{
if (qtype == T_DS)
{
crecp = NULL;
while ((crecp = cache_find_by_name(crecp, name, now, F_DS)))
if (crecp->uid == qclass)
{
gotone = 1;
if (!dryrun && (keydata = blockdata_retrieve(crecp->addr.ds.keydata, crecp->addr.ds.keylen, NULL)))
{
struct all_addr a;
a.addr.keytag = crecp->addr.ds.keytag;
log_query(F_KEYTAG | (crecp->flags & F_CONFIG), name, &a, "DS keytag %u");
if (add_resource_record(header, limit, &trunc, nameoffset, &ansp,
crec_ttl(crecp, now), &nameoffset,
@@ -1589,52 +1585,52 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
crecp->addr.ds.keytag, crecp->addr.ds.algo, crecp->addr.ds.digest, crecp->addr.ds.keylen, keydata))
anscount++;
}
}
}
else if (qtype == T_DNSKEY)
{
crecp = NULL;
while ((crecp = cache_find_by_name(crecp, name, now, F_DNSKEY)))
if (crecp->uid == qclass)
{
if ((crecp->flags & F_CONFIG) || have_rrsig) /* Return configured keys without an RRISG */
}
}
}
else /* DNSKEY */
{
crecp = NULL;
while ((crecp = cache_find_by_name(crecp, name, now, F_DNSKEY)))
if (crecp->uid == qclass)
{
if (!(crecp->flags & F_CONFIG))
auth = 0, gotone = 1;
ans = 1;
if (!dryrun && (keydata = blockdata_retrieve(crecp->addr.key.keydata, crecp->addr.key.keylen, NULL)))
{
struct all_addr a;
a.addr.keytag = crecp->addr.key.keytag;
log_query(F_KEYTAG | (crecp->flags & F_CONFIG), name, &a, "DNSKEY keytag %u");
if (add_resource_record(header, limit, &trunc, nameoffset, &ansp,
crec_ttl(crecp, now), &nameoffset,
T_DNSKEY, qclass, "sbbt",
crecp->addr.key.flags, 3, crecp->addr.key.algo, crecp->addr.key.keylen, keydata))
anscount++;
if (!(crecp->flags & F_CONFIG)) /* Don't return configured keys - send upstream instead */
{
gotone = 1;
if (!dryrun && (keydata = blockdata_retrieve(crecp->addr.key.keydata, crecp->addr.key.keylen, NULL)))
{
struct all_addr a;
a.addr.keytag = crecp->addr.key.keytag;
log_query(F_KEYTAG | (crecp->flags & F_CONFIG), name, &a, "DNSKEY keytag %u");
if (add_resource_record(header, limit, &trunc, nameoffset, &ansp,
crec_ttl(crecp, now), &nameoffset,
T_DNSKEY, qclass, "sbbt",
crecp->addr.key.flags, 3, crecp->addr.key.algo, crecp->addr.key.keylen, keydata))
anscount++;
}
}
}
}
}
}
/* Now do RRSIGs */
if (gotone)
{
crecp = NULL;
while ((crecp = cache_find_by_name(crecp, name, now, F_DNSKEY | F_DS)))
if (crecp->uid == qclass && (qtype == T_RRSIG || (sec_reqd && crecp->addr.sig.type_covered == qtype)) &&
!dryrun &&
(keydata = blockdata_retrieve(crecp->addr.sig.keydata, crecp->addr.sig.keylen, NULL)))
{
if (qtype == T_RRSIG)
log_query(F_RRNAME, name, NULL, querystr("rrsig", crecp->addr.sig.type_covered));
if ((keydata = blockdata_retrieve(crecp->addr.sig.keydata, crecp->addr.sig.keylen, NULL)) &&
ans = 1;
auth = 0;
if (!dryrun && sec_reqd)
{
crecp = NULL;
while ((crecp = cache_find_by_name(crecp, name, now, F_DNSKEY | F_DS)))
if (crecp->uid == qclass && crecp->addr.sig.type_covered == qtype &&
(keydata = blockdata_retrieve(crecp->addr.sig.keydata, crecp->addr.sig.keylen, NULL)))
{
add_resource_record(header, limit, &trunc, nameoffset, &ansp,
crec_ttl(crecp, now), &nameoffset,
T_RRSIG, qclass, "t", crecp->addr.sig.keylen, keydata))
anscount++;
}
T_RRSIG, qclass, "t", crecp->addr.sig.keylen, keydata);
anscount++;
}
}
}
}
#endif