diff options
| author | Lennart Poettering <lennart@poettering.net> | 2016-01-02 21:33:17 +0100 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2016-01-02 22:16:16 +0100 |
| commit | a8f158b9296c7bc1d0f627715e626cc50a331efc (patch) | |
| tree | e31340cbb38ea79a5ee6c4aebd0542f287186ee8 /src/resolve/resolved-dns-dnssec.c | |
| parent | 31d5192d0c661cf1dfe1f86bc00e2dc5a1e1092b (diff) | |
resolved: don't accept NSEC3 iteration fields unbounded
Diffstat (limited to 'src/resolve/resolved-dns-dnssec.c')
| -rw-r--r-- | src/resolve/resolved-dns-dnssec.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/resolve/resolved-dns-dnssec.c b/src/resolve/resolved-dns-dnssec.c index e4b32c7e4b..7736a67d96 100644 --- a/src/resolve/resolved-dns-dnssec.c +++ b/src/resolve/resolved-dns-dnssec.c @@ -53,6 +53,9 @@ /* Permit a maximum clock skew of 1h 10min. This should be enough to deal with DST confusion */ #define SKEW_MAX (1*USEC_PER_HOUR + 10*USEC_PER_MINUTE) +/* Maximum number of NSEC3 iterations we'll do. */ +#define NSEC3_ITERATIONS_MAX 2048 + /* * The DNSSEC Chain of trust: * @@ -1087,6 +1090,9 @@ int dnssec_nsec3_hash(DnsResourceRecord *nsec3, const char *name, void *ret) { if (nsec3->key->type != DNS_TYPE_NSEC3) return -EINVAL; + if (nsec3->nsec3.iterations > NSEC3_ITERATIONS_MAX) + return -EOPNOTSUPP; + algorithm = nsec3_hash_to_gcrypt_md(nsec3->nsec3.algorithm); if (algorithm < 0) return algorithm; @@ -1155,6 +1161,9 @@ static int nsec3_is_good(DnsResourceRecord *rr, DnsAnswerFlags flags, DnsResourc /* Ignore NSEC3 RRs whose algorithm we don't know */ if (nsec3_hash_to_gcrypt_md(rr->nsec3.algorithm) < 0) return 0; + /* Ignore NSEC3 RRs with an excessive number of required iterations */ + if (rr->nsec3.iterations > NSEC3_ITERATIONS_MAX) + return 0; if (!nsec3) return 1; |