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resolved: dnssec - factor out hashed domain generation

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This commit is contained in:
Tom Gundersen 2016-01-03 09:49:58 +01:00
parent 146035b3bb
commit 6f76ec5a7b
2 changed files with 34 additions and 23 deletions
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55
src/resolve/resolved-dns-dnssec.c
View File

@ -1071,7 +1071,7 @@ static int nsec3_hash_to_gcrypt_md(uint8_t algorithm) {
}
}
int dnssec_nsec3_hash(DnsResourceRecord *nsec3, const char *name, void *ret) {
int dnssec_nsec3_hash(const DnsResourceRecord *nsec3, const char *name, void *ret) {
uint8_t wire_format[DNS_WIRE_FOMAT_HOSTNAME_MAX];
gcry_md_hd_t md = NULL;
size_t hash_size;
@ -1192,10 +1192,37 @@ static int nsec3_is_good(DnsResourceRecord *rr, DnsAnswerFlags flags, DnsResourc
return dns_name_equal(a, b);
}
static int nsec3_hashed_domain(const DnsResourceRecord *nsec3, const char *domain, const char *zone, char **ret) {
_cleanup_free_ char *l = NULL, *hashed_domain = NULL;
uint8_t hashed[DNSSEC_HASH_SIZE_MAX];
int hashed_size;
assert(nsec3);
assert(domain);
assert(zone);
assert(ret);
hashed_size = dnssec_nsec3_hash(nsec3, domain, hashed);
if (hashed_size < 0)
return hashed_size;
l = base32hexmem(hashed, hashed_size, false);
if (!l)
return -ENOMEM;
hashed_domain = strjoin(l, ".", zone, NULL);
if (!hashed_domain)
return -ENOMEM;
*ret = hashed_domain;
hashed_domain = NULL;
return hashed_size;
}
/* See RFC 5155, Section 8 */
static int dnssec_test_nsec3(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result, bool *authenticated) {
_cleanup_free_ char *next_closer_domain = NULL, *l = NULL;
uint8_t hashed[DNSSEC_HASH_SIZE_MAX];
_cleanup_free_ char *next_closer_domain = NULL;
const char *zone, *p, *pp = NULL;
DnsResourceRecord *rr, *enclosure_rr, *suffix_rr;
DnsAnswerFlags flags;
@ -1242,9 +1269,9 @@ found_zone:
/* Second step, find the closest encloser NSEC3 RR in 'answer' that matches 'key' */
p = DNS_RESOURCE_KEY_NAME(key);
for (;;) {
_cleanup_free_ char *hashed_domain = NULL, *label = NULL;
_cleanup_free_ char *hashed_domain = NULL;
hashed_size = dnssec_nsec3_hash(suffix_rr, p, hashed);
hashed_size = nsec3_hashed_domain(suffix_rr, p, zone, &hashed_domain);
if (hashed_size == -EOPNOTSUPP) {
*result = DNSSEC_NSEC_UNSUPPORTED_ALGORITHM;
return 0;
@ -1252,14 +1279,6 @@ found_zone:
if (hashed_size < 0)
return hashed_size;
label = base32hexmem(hashed, hashed_size, false);
if (!label)
return -ENOMEM;
hashed_domain = strjoin(label, ".", zone, NULL);
if (!hashed_domain)
return -ENOMEM;
DNS_ANSWER_FOREACH_FLAGS(enclosure_rr, flags, answer) {
r = nsec3_is_good(enclosure_rr, flags, suffix_rr);
@ -1326,20 +1345,12 @@ found_closest_encloser:
return 0;
}
r = dnssec_nsec3_hash(enclosure_rr, pp, hashed);
r = nsec3_hashed_domain(enclosure_rr, pp, zone, &next_closer_domain);
if (r < 0)
return r;
if (r != hashed_size)
return -EBADMSG;
l = base32hexmem(hashed, hashed_size, false);
if (!l)
return -ENOMEM;
next_closer_domain = strjoin(l, ".", zone, NULL);
if (!next_closer_domain)
return -ENOMEM;
DNS_ANSWER_FOREACH_FLAGS(rr, flags, answer) {
_cleanup_free_ char *label = NULL, *next_hashed_domain = NULL;

2
src/resolve/resolved-dns-dnssec.h
View File

@ -87,7 +87,7 @@ uint16_t dnssec_keytag(DnsResourceRecord *dnskey);
int dnssec_canonicalize(const char *n, char *buffer, size_t buffer_max);
int dnssec_nsec3_hash(DnsResourceRecord *nsec3, const char *name, void *ret);
int dnssec_nsec3_hash(const DnsResourceRecord *nsec3, const char *name, void *ret);
typedef enum DnssecNsecResult {
DNSSEC_NSEC_NO_RR, /* No suitable NSEC/NSEC3 RR found */