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freebsd-nq/contrib/ldns/dnssec_sign.c
Dag-Erling Smørgrav 7b5038d71c Import LDNS and build it as an internal library.
2013-02-15 13:44:18 +00:00

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#include <ldns/config.h>
#include <ldns/ldns.h>
#include <ldns/dnssec.h>
#include <ldns/dnssec_sign.h>
#include <strings.h>
#include <time.h>
#ifdef HAVE_SSL
/* this entire file is rather useless when you don't have
* crypto...
*/
#include <openssl/ssl.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/err.h>
#include <openssl/md5.h>
#endif /* HAVE_SSL */
ldns_rr *
ldns_create_empty_rrsig(ldns_rr_list *rrset,
ldns_key *current_key)
{
uint32_t orig_ttl;
ldns_rr_class orig_class;
time_t now;
ldns_rr *current_sig;
uint8_t label_count;
ldns_rdf *signame;
label_count = ldns_dname_label_count(ldns_rr_owner(ldns_rr_list_rr(rrset,
0)));
/* RFC4035 2.2: not counting the leftmost label if it is a wildcard */
if(ldns_dname_is_wildcard(ldns_rr_owner(ldns_rr_list_rr(rrset, 0))))
label_count --;
current_sig = ldns_rr_new_frm_type(LDNS_RR_TYPE_RRSIG);
/* set the type on the new signature */
orig_ttl = ldns_rr_ttl(ldns_rr_list_rr(rrset, 0));
orig_class = ldns_rr_get_class(ldns_rr_list_rr(rrset, 0));
ldns_rr_set_ttl(current_sig, orig_ttl);
ldns_rr_set_class(current_sig, orig_class);
ldns_rr_set_owner(current_sig,
ldns_rdf_clone(
ldns_rr_owner(
ldns_rr_list_rr(rrset,
0))));
/* fill in what we know of the signature */
/* set the orig_ttl */
(void)ldns_rr_rrsig_set_origttl(
current_sig,
ldns_native2rdf_int32(LDNS_RDF_TYPE_INT32,
orig_ttl));
/* the signers name */
signame = ldns_rdf_clone(ldns_key_pubkey_owner(current_key));
ldns_dname2canonical(signame);
(void)ldns_rr_rrsig_set_signame(
current_sig,
signame);
/* label count - get it from the first rr in the rr_list */
(void)ldns_rr_rrsig_set_labels(
current_sig,
ldns_native2rdf_int8(LDNS_RDF_TYPE_INT8,
label_count));
/* inception, expiration */
now = time(NULL);
if (ldns_key_inception(current_key) != 0) {
(void)ldns_rr_rrsig_set_inception(
current_sig,
ldns_native2rdf_int32(
LDNS_RDF_TYPE_TIME,
ldns_key_inception(current_key)));
} else {
(void)ldns_rr_rrsig_set_inception(
current_sig,
ldns_native2rdf_int32(LDNS_RDF_TYPE_TIME, now));
}
if (ldns_key_expiration(current_key) != 0) {
(void)ldns_rr_rrsig_set_expiration(
current_sig,
ldns_native2rdf_int32(
LDNS_RDF_TYPE_TIME,
ldns_key_expiration(current_key)));
} else {
(void)ldns_rr_rrsig_set_expiration(
current_sig,
ldns_native2rdf_int32(
LDNS_RDF_TYPE_TIME,
now + LDNS_DEFAULT_EXP_TIME));
}
(void)ldns_rr_rrsig_set_keytag(
current_sig,
ldns_native2rdf_int16(LDNS_RDF_TYPE_INT16,
ldns_key_keytag(current_key)));
(void)ldns_rr_rrsig_set_algorithm(
current_sig,
ldns_native2rdf_int8(
LDNS_RDF_TYPE_ALG,
ldns_key_algorithm(current_key)));
(void)ldns_rr_rrsig_set_typecovered(
current_sig,
ldns_native2rdf_int16(
LDNS_RDF_TYPE_TYPE,
ldns_rr_get_type(ldns_rr_list_rr(rrset,
0))));
return current_sig;
}
#ifdef HAVE_SSL
ldns_rdf *
ldns_sign_public_buffer(ldns_buffer *sign_buf, ldns_key *current_key)
{
ldns_rdf *b64rdf = NULL;
switch(ldns_key_algorithm(current_key)) {
case LDNS_SIGN_DSA:
case LDNS_SIGN_DSA_NSEC3:
b64rdf = ldns_sign_public_evp(
sign_buf,
ldns_key_evp_key(current_key),
EVP_dss1());
break;
case LDNS_SIGN_RSASHA1:
case LDNS_SIGN_RSASHA1_NSEC3:
b64rdf = ldns_sign_public_evp(
sign_buf,
ldns_key_evp_key(current_key),
EVP_sha1());
break;
#ifdef USE_SHA2
case LDNS_SIGN_RSASHA256:
b64rdf = ldns_sign_public_evp(
sign_buf,
ldns_key_evp_key(current_key),
EVP_sha256());
break;
case LDNS_SIGN_RSASHA512:
b64rdf = ldns_sign_public_evp(
sign_buf,
ldns_key_evp_key(current_key),
EVP_sha512());
break;
#endif /* USE_SHA2 */
#ifdef USE_GOST
case LDNS_SIGN_ECC_GOST:
b64rdf = ldns_sign_public_evp(
sign_buf,
ldns_key_evp_key(current_key),
EVP_get_digestbyname("md_gost94"));
break;
#endif /* USE_GOST */
#ifdef USE_ECDSA
case LDNS_SIGN_ECDSAP256SHA256:
b64rdf = ldns_sign_public_evp(
sign_buf,
ldns_key_evp_key(current_key),
EVP_sha256());
break;
case LDNS_SIGN_ECDSAP384SHA384:
b64rdf = ldns_sign_public_evp(
sign_buf,
ldns_key_evp_key(current_key),
EVP_sha384());
break;
#endif
case LDNS_SIGN_RSAMD5:
b64rdf = ldns_sign_public_evp(
sign_buf,
ldns_key_evp_key(current_key),
EVP_md5());
break;
default:
/* do _you_ know this alg? */
printf("unknown algorithm, ");
printf("is the one used available on this system?\n");
break;
}
return b64rdf;
}
/**
* use this function to sign with a public/private key alg
* return the created signatures
*/
ldns_rr_list *
ldns_sign_public(ldns_rr_list *rrset, ldns_key_list *keys)
{
ldns_rr_list *signatures;
ldns_rr_list *rrset_clone;
ldns_rr *current_sig;
ldns_rdf *b64rdf;
ldns_key *current_key;
size_t key_count;
uint16_t i;
ldns_buffer *sign_buf;
ldns_rdf *new_owner;
if (!rrset || ldns_rr_list_rr_count(rrset) < 1 || !keys) {
return NULL;
}
new_owner = NULL;
signatures = ldns_rr_list_new();
/* prepare a signature and add all the know data
* prepare the rrset. Sign this together. */
rrset_clone = ldns_rr_list_clone(rrset);
if (!rrset_clone) {
return NULL;
}
/* make it canonical */
for(i = 0; i < ldns_rr_list_rr_count(rrset_clone); i++) {
ldns_rr_set_ttl(ldns_rr_list_rr(rrset_clone, i),
ldns_rr_ttl(ldns_rr_list_rr(rrset, 0)));
ldns_rr2canonical(ldns_rr_list_rr(rrset_clone, i));
}
/* sort */
ldns_rr_list_sort(rrset_clone);
for (key_count = 0;
key_count < ldns_key_list_key_count(keys);
key_count++) {
if (!ldns_key_use(ldns_key_list_key(keys, key_count))) {
continue;
}
sign_buf = ldns_buffer_new(LDNS_MAX_PACKETLEN);
if (!sign_buf) {
ldns_rr_list_free(rrset_clone);
ldns_rr_list_free(signatures);
ldns_rdf_free(new_owner);
return NULL;
}
b64rdf = NULL;
current_key = ldns_key_list_key(keys, key_count);
/* sign all RRs with keys that have ZSKbit, !SEPbit.
sign DNSKEY RRs with keys that have ZSKbit&SEPbit */
if (ldns_key_flags(current_key) & LDNS_KEY_ZONE_KEY) {
current_sig = ldns_create_empty_rrsig(rrset_clone,
current_key);
/* right now, we have: a key, a semi-sig and an rrset. For
* which we can create the sig and base64 encode that and
* add that to the signature */
if (ldns_rrsig2buffer_wire(sign_buf, current_sig)
!= LDNS_STATUS_OK) {
ldns_buffer_free(sign_buf);
/* ERROR */
ldns_rr_list_deep_free(rrset_clone);
return NULL;
}
/* add the rrset in sign_buf */
if (ldns_rr_list2buffer_wire(sign_buf, rrset_clone)
!= LDNS_STATUS_OK) {
ldns_buffer_free(sign_buf);
ldns_rr_list_deep_free(rrset_clone);
return NULL;
}
b64rdf = ldns_sign_public_buffer(sign_buf, current_key);
if (!b64rdf) {
/* signing went wrong */
ldns_rr_list_deep_free(rrset_clone);
return NULL;
}
ldns_rr_rrsig_set_sig(current_sig, b64rdf);
/* push the signature to the signatures list */
ldns_rr_list_push_rr(signatures, current_sig);
}
ldns_buffer_free(sign_buf); /* restart for the next key */
}
ldns_rr_list_deep_free(rrset_clone);
return signatures;
}
/**
* Sign data with DSA
*
* \param[in] to_sign The ldns_buffer containing raw data that is
* to be signed
* \param[in] key The DSA key structure to sign with
* \return ldns_rdf for the RRSIG ldns_rr
*/
ldns_rdf *
ldns_sign_public_dsa(ldns_buffer *to_sign, DSA *key)
{
unsigned char *sha1_hash;
ldns_rdf *sigdata_rdf;
ldns_buffer *b64sig;
DSA_SIG *sig;
uint8_t *data;
size_t pad;
b64sig = ldns_buffer_new(LDNS_MAX_PACKETLEN);
if (!b64sig) {
return NULL;
}
sha1_hash = SHA1((unsigned char*)ldns_buffer_begin(to_sign),
ldns_buffer_position(to_sign), NULL);
if (!sha1_hash) {
ldns_buffer_free(b64sig);
return NULL;
}
sig = DSA_do_sign(sha1_hash, SHA_DIGEST_LENGTH, key);
if(!sig) {
ldns_buffer_free(b64sig);
return NULL;
}
data = LDNS_XMALLOC(uint8_t, 1 + 2 * SHA_DIGEST_LENGTH);
if(!data) {
ldns_buffer_free(b64sig);
DSA_SIG_free(sig);
return NULL;
}
data[0] = 1;
pad = 20 - (size_t) BN_num_bytes(sig->r);
if (pad > 0) {
memset(data + 1, 0, pad);
}
BN_bn2bin(sig->r, (unsigned char *) (data + 1) + pad);
pad = 20 - (size_t) BN_num_bytes(sig->s);
if (pad > 0) {
memset(data + 1 + SHA_DIGEST_LENGTH, 0, pad);
}
BN_bn2bin(sig->s, (unsigned char *) (data + 1 + SHA_DIGEST_LENGTH + pad));
sigdata_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_B64,
1 + 2 * SHA_DIGEST_LENGTH,
data);
ldns_buffer_free(b64sig);
LDNS_FREE(data);
DSA_SIG_free(sig);
return sigdata_rdf;
}
#ifdef USE_ECDSA
#ifndef S_SPLINT_S
static int
ldns_pkey_is_ecdsa(EVP_PKEY* pkey)
{
EC_KEY* ec;
const EC_GROUP* g;
if(EVP_PKEY_type(pkey->type) != EVP_PKEY_EC)
return 0;
ec = EVP_PKEY_get1_EC_KEY(pkey);
g = EC_KEY_get0_group(ec);
if(!g) {
EC_KEY_free(ec);
return 0;
}
if(EC_GROUP_get_curve_name(g) == NID_secp224r1 ||
EC_GROUP_get_curve_name(g) == NID_X9_62_prime256v1 ||
EC_GROUP_get_curve_name(g) == NID_secp384r1) {
EC_KEY_free(ec);
return 1;
}
/* downref the eckey, the original is still inside the pkey */
EC_KEY_free(ec);
return 0;
}
#endif /* splint */
#endif /* USE_ECDSA */
ldns_rdf *
ldns_sign_public_evp(ldns_buffer *to_sign,
EVP_PKEY *key,
const EVP_MD *digest_type)
{
unsigned int siglen;
ldns_rdf *sigdata_rdf;
ldns_buffer *b64sig;
EVP_MD_CTX ctx;
const EVP_MD *md_type;
int r;
siglen = 0;
b64sig = ldns_buffer_new(LDNS_MAX_PACKETLEN);
if (!b64sig) {
return NULL;
}
/* initializes a signing context */
md_type = digest_type;
if(!md_type) {
/* unknown message difest */
ldns_buffer_free(b64sig);
return NULL;
}
EVP_MD_CTX_init(&ctx);
r = EVP_SignInit(&ctx, md_type);
if(r == 1) {
r = EVP_SignUpdate(&ctx, (unsigned char*)
ldns_buffer_begin(to_sign),
ldns_buffer_position(to_sign));
} else {
ldns_buffer_free(b64sig);
return NULL;
}
if(r == 1) {
r = EVP_SignFinal(&ctx, (unsigned char*)
ldns_buffer_begin(b64sig), &siglen, key);
} else {
ldns_buffer_free(b64sig);
return NULL;
}
if(r != 1) {
ldns_buffer_free(b64sig);
return NULL;
}
/* unfortunately, OpenSSL output is differenct from DNS DSA format */
#ifndef S_SPLINT_S
if (EVP_PKEY_type(key->type) == EVP_PKEY_DSA) {
sigdata_rdf = ldns_convert_dsa_rrsig_asn12rdf(b64sig, siglen);
#ifdef USE_ECDSA
} else if(EVP_PKEY_type(key->type) == EVP_PKEY_EC &&
ldns_pkey_is_ecdsa(key)) {
sigdata_rdf = ldns_convert_ecdsa_rrsig_asn12rdf(b64sig, siglen);
#endif
} else {
/* ok output for other types is the same */
sigdata_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_B64, siglen,
ldns_buffer_begin(b64sig));
}
#endif /* splint */
ldns_buffer_free(b64sig);
EVP_MD_CTX_cleanup(&ctx);
return sigdata_rdf;
}
ldns_rdf *
ldns_sign_public_rsasha1(ldns_buffer *to_sign, RSA *key)
{
unsigned char *sha1_hash;
unsigned int siglen;
ldns_rdf *sigdata_rdf;
ldns_buffer *b64sig;
int result;
siglen = 0;
b64sig = ldns_buffer_new(LDNS_MAX_PACKETLEN);
if (!b64sig) {
return NULL;
}
sha1_hash = SHA1((unsigned char*)ldns_buffer_begin(to_sign),
ldns_buffer_position(to_sign), NULL);
if (!sha1_hash) {
ldns_buffer_free(b64sig);
return NULL;
}
result = RSA_sign(NID_sha1, sha1_hash, SHA_DIGEST_LENGTH,
(unsigned char*)ldns_buffer_begin(b64sig),
&siglen, key);
if (result != 1) {
return NULL;
}
if (result != 1) {
return NULL;
}
sigdata_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_B64, siglen,
ldns_buffer_begin(b64sig));
ldns_buffer_free(b64sig); /* can't free this buffer ?? */
return sigdata_rdf;
}
ldns_rdf *
ldns_sign_public_rsamd5(ldns_buffer *to_sign, RSA *key)
{
unsigned char *md5_hash;
unsigned int siglen;
ldns_rdf *sigdata_rdf;
ldns_buffer *b64sig;
b64sig = ldns_buffer_new(LDNS_MAX_PACKETLEN);
if (!b64sig) {
return NULL;
}
md5_hash = MD5((unsigned char*)ldns_buffer_begin(to_sign),
ldns_buffer_position(to_sign), NULL);
if (!md5_hash) {
ldns_buffer_free(b64sig);
return NULL;
}
RSA_sign(NID_md5, md5_hash, MD5_DIGEST_LENGTH,
(unsigned char*)ldns_buffer_begin(b64sig),
&siglen, key);
sigdata_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_B64, siglen,
ldns_buffer_begin(b64sig));
ldns_buffer_free(b64sig);
return sigdata_rdf;
}
#endif /* HAVE_SSL */
/**
* Pushes all rrs from the rrsets of type A and AAAA on gluelist.
*/
static ldns_status
ldns_dnssec_addresses_on_glue_list(
ldns_dnssec_rrsets *cur_rrset,
ldns_rr_list *glue_list)
{
ldns_dnssec_rrs *cur_rrs;
while (cur_rrset) {
if (cur_rrset->type == LDNS_RR_TYPE_A
|| cur_rrset->type == LDNS_RR_TYPE_AAAA) {
for (cur_rrs = cur_rrset->rrs;
cur_rrs;
cur_rrs = cur_rrs->next) {
if (cur_rrs->rr) {
if (!ldns_rr_list_push_rr(glue_list,
cur_rrs->rr)) {
return LDNS_STATUS_MEM_ERR;
/* ldns_rr_list_push_rr()
* returns false when unable
* to increase the capacity
* of the ldsn_rr_list
*/
}
}
}
}
cur_rrset = cur_rrset->next;
}
return LDNS_STATUS_OK;
}
/**
* Marks the names in the zone that are occluded. Those names will be skipped
* when walking the tree with the ldns_dnssec_name_node_next_nonglue()
* function. But watch out! Names that are partially occluded (like glue with
* the same name as the delegation) will not be marked and should specifically
* be taken into account seperately.
*
* When glue_list is given (not NULL), in the process of marking the names, all
* glue resource records will be pushed to that list, even glue at delegation names.
*
* \param[in] zone the zone in which to mark the names
* \param[in] glue_list the list to which to push the glue rrs
* \return LDNS_STATUS_OK on success, an error code otherwise
*/
ldns_status
ldns_dnssec_zone_mark_and_get_glue(ldns_dnssec_zone *zone,
ldns_rr_list *glue_list)
{
ldns_rbnode_t *node;
ldns_dnssec_name *name;
ldns_rdf *owner;
ldns_rdf *cut = NULL; /* keeps track of zone cuts */
/* When the cut is caused by a delegation, below_delegation will be 1.
* When caused by a DNAME, below_delegation will be 0.
*/
int below_delegation = -1; /* init suppresses comiler warning */
ldns_status s;
if (!zone || !zone->names) {
return LDNS_STATUS_NULL;
}
for (node = ldns_rbtree_first(zone->names);
node != LDNS_RBTREE_NULL;
node = ldns_rbtree_next(node)) {
name = (ldns_dnssec_name *) node->data;
owner = ldns_dnssec_name_name(name);
if (cut) {
/* The previous node was a zone cut, or a subdomain
* below a zone cut. Is this node (still) a subdomain
* below the cut? Then the name is occluded. Unless
* the name contains a SOA, after which we are
* authoritative again.
*
* FIXME! If there are labels in between the SOA and
* the cut, going from the authoritative space (below
* the SOA) up into occluded space again, will not be
* detected with the contruct below!
*/
if (ldns_dname_is_subdomain(owner, cut) &&
!ldns_dnssec_rrsets_contains_type(
name->rrsets, LDNS_RR_TYPE_SOA)) {
if (below_delegation && glue_list) {
s = ldns_dnssec_addresses_on_glue_list(
name->rrsets, glue_list);
if (s != LDNS_STATUS_OK) {
return s;
}
}
name->is_glue = true; /* Mark occluded name! */
continue;
} else {
cut = NULL;
}
}
/* The node is not below a zone cut. Is it a zone cut itself?
* Everything below a SOA is authoritative of course; Except
* when the name also contains a DNAME :).
*/
if (ldns_dnssec_rrsets_contains_type(
name->rrsets, LDNS_RR_TYPE_NS)
&& !ldns_dnssec_rrsets_contains_type(
name->rrsets, LDNS_RR_TYPE_SOA)) {
cut = owner;
below_delegation = 1;
if (glue_list) { /* record glue on the zone cut */
s = ldns_dnssec_addresses_on_glue_list(
name->rrsets, glue_list);
if (s != LDNS_STATUS_OK) {
return s;
}
}
} else if (ldns_dnssec_rrsets_contains_type(
name->rrsets, LDNS_RR_TYPE_DNAME)) {
cut = owner;
below_delegation = 0;
}
}
return LDNS_STATUS_OK;
}
/**
* Marks the names in the zone that are occluded. Those names will be skipped
* when walking the tree with the ldns_dnssec_name_node_next_nonglue()
* function. But watch out! Names that are partially occluded (like glue with
* the same name as the delegation) will not be marked and should specifically
* be taken into account seperately.
*
* \param[in] zone the zone in which to mark the names
* \return LDNS_STATUS_OK on success, an error code otherwise
*/
ldns_status
ldns_dnssec_zone_mark_glue(ldns_dnssec_zone *zone)
{
return ldns_dnssec_zone_mark_and_get_glue(zone, NULL);
}
ldns_rbnode_t *
ldns_dnssec_name_node_next_nonglue(ldns_rbnode_t *node)
{
ldns_rbnode_t *next_node = NULL;
ldns_dnssec_name *next_name = NULL;
bool done = false;
if (node == LDNS_RBTREE_NULL) {
return NULL;
}
next_node = node;
while (!done) {
if (next_node == LDNS_RBTREE_NULL) {
return NULL;
} else {
next_name = (ldns_dnssec_name *)next_node->data;
if (!next_name->is_glue) {
done = true;
} else {
next_node = ldns_rbtree_next(next_node);
}
}
}
return next_node;
}
ldns_status
ldns_dnssec_zone_create_nsecs(ldns_dnssec_zone *zone,
ldns_rr_list *new_rrs)
{
ldns_rbnode_t *first_node, *cur_node, *next_node;
ldns_dnssec_name *cur_name, *next_name;
ldns_rr *nsec_rr;
uint32_t nsec_ttl;
ldns_dnssec_rrsets *soa;
/* the TTL of NSEC rrs should be set to the minimum TTL of
* the zone SOA (RFC4035 Section 2.3)
*/
soa = ldns_dnssec_name_find_rrset(zone->soa, LDNS_RR_TYPE_SOA);
/* did the caller actually set it? if not,
* fall back to default ttl
*/
if (soa && soa->rrs && soa->rrs->rr
&& (ldns_rr_rdf(soa->rrs->rr, 6) != NULL)) {
nsec_ttl = ldns_rdf2native_int32(ldns_rr_rdf(soa->rrs->rr, 6));
} else {
nsec_ttl = LDNS_DEFAULT_TTL;
}
first_node = ldns_dnssec_name_node_next_nonglue(
ldns_rbtree_first(zone->names));
cur_node = first_node;
if (cur_node) {
next_node = ldns_dnssec_name_node_next_nonglue(
ldns_rbtree_next(cur_node));
} else {
next_node = NULL;
}
while (cur_node && next_node) {
cur_name = (ldns_dnssec_name *)cur_node->data;
next_name = (ldns_dnssec_name *)next_node->data;
nsec_rr = ldns_dnssec_create_nsec(cur_name,
next_name,
LDNS_RR_TYPE_NSEC);
ldns_rr_set_ttl(nsec_rr, nsec_ttl);
if(ldns_dnssec_name_add_rr(cur_name, nsec_rr)!=LDNS_STATUS_OK){
ldns_rr_free(nsec_rr);
return LDNS_STATUS_ERR;
}
ldns_rr_list_push_rr(new_rrs, nsec_rr);
cur_node = next_node;
if (cur_node) {
next_node = ldns_dnssec_name_node_next_nonglue(
ldns_rbtree_next(cur_node));
}
}
if (cur_node && !next_node) {
cur_name = (ldns_dnssec_name *)cur_node->data;
next_name = (ldns_dnssec_name *)first_node->data;
nsec_rr = ldns_dnssec_create_nsec(cur_name,
next_name,
LDNS_RR_TYPE_NSEC);
ldns_rr_set_ttl(nsec_rr, nsec_ttl);
if(ldns_dnssec_name_add_rr(cur_name, nsec_rr)!=LDNS_STATUS_OK){
ldns_rr_free(nsec_rr);
return LDNS_STATUS_ERR;
}
ldns_rr_list_push_rr(new_rrs, nsec_rr);
} else {
printf("error\n");
}
return LDNS_STATUS_OK;
}
#ifdef HAVE_SSL
/* in dnssec_zone.c */
extern int ldns_dname_compare_v(const void *a, const void *b);
static ldns_status
ldns_dnssec_zone_create_nsec3s_mkmap(ldns_dnssec_zone *zone,
ldns_rr_list *new_rrs,
uint8_t algorithm,
uint8_t flags,
uint16_t iterations,
uint8_t salt_length,
uint8_t *salt,
ldns_rbtree_t **map)
{
ldns_rbnode_t *first_name_node;
ldns_rbnode_t *current_name_node;
ldns_dnssec_name *current_name;
ldns_status result = LDNS_STATUS_OK;
ldns_rr *nsec_rr;
ldns_rr_list *nsec3_list;
uint32_t nsec_ttl;
ldns_dnssec_rrsets *soa;
ldns_rbnode_t *hashmap_node;
if (!zone || !new_rrs || !zone->names) {
return LDNS_STATUS_ERR;
}
/* the TTL of NSEC rrs should be set to the minimum TTL of
* the zone SOA (RFC4035 Section 2.3)
*/
soa = ldns_dnssec_name_find_rrset(zone->soa, LDNS_RR_TYPE_SOA);
/* did the caller actually set it? if not,
* fall back to default ttl
*/
if (soa && soa->rrs && soa->rrs->rr
&& ldns_rr_rdf(soa->rrs->rr, 6) != NULL) {
nsec_ttl = ldns_rdf2native_int32(ldns_rr_rdf(soa->rrs->rr, 6));
} else {
nsec_ttl = LDNS_DEFAULT_TTL;
}
if (map) {
if ((*map = ldns_rbtree_create(ldns_dname_compare_v))
== NULL) {
map = NULL;
};
}
nsec3_list = ldns_rr_list_new();
first_name_node = ldns_dnssec_name_node_next_nonglue(
ldns_rbtree_first(zone->names));
current_name_node = first_name_node;
while (current_name_node &&
current_name_node != LDNS_RBTREE_NULL) {
current_name = (ldns_dnssec_name *) current_name_node->data;
nsec_rr = ldns_dnssec_create_nsec3(current_name,
NULL,
zone->soa->name,
algorithm,
flags,
iterations,
salt_length,
salt);
/* by default, our nsec based generator adds rrsigs
* remove the bitmap for empty nonterminals */
if (!current_name->rrsets) {
ldns_rdf_deep_free(ldns_rr_pop_rdf(nsec_rr));
}
ldns_rr_set_ttl(nsec_rr, nsec_ttl);
result = ldns_dnssec_name_add_rr(current_name, nsec_rr);
ldns_rr_list_push_rr(new_rrs, nsec_rr);
ldns_rr_list_push_rr(nsec3_list, nsec_rr);
if (map) {
hashmap_node = LDNS_MALLOC(ldns_rbnode_t);
if (hashmap_node && ldns_rr_owner(nsec_rr)) {
hashmap_node->key = ldns_dname_label(
ldns_rr_owner(nsec_rr), 0);
if (hashmap_node->key) {
hashmap_node->data = current_name->name;
(void) ldns_rbtree_insert(
*map, hashmap_node);
}
}
}
current_name_node = ldns_dnssec_name_node_next_nonglue(
ldns_rbtree_next(current_name_node));
}
if (result != LDNS_STATUS_OK) {
return result;
}
ldns_rr_list_sort_nsec3(nsec3_list);
result = ldns_dnssec_chain_nsec3_list(nsec3_list);
if (result != LDNS_STATUS_OK) {
return result;
}
ldns_rr_list_free(nsec3_list);
return result;
}
ldns_status
ldns_dnssec_zone_create_nsec3s(ldns_dnssec_zone *zone,
ldns_rr_list *new_rrs,
uint8_t algorithm,
uint8_t flags,
uint16_t iterations,
uint8_t salt_length,
uint8_t *salt)
{
return ldns_dnssec_zone_create_nsec3s_mkmap(zone, new_rrs, algorithm,
flags, iterations, salt_length, salt, NULL);
}
#endif /* HAVE_SSL */
ldns_dnssec_rrs *
ldns_dnssec_remove_signatures( ldns_dnssec_rrs *signatures
, ATTR_UNUSED(ldns_key_list *key_list)
, int (*func)(ldns_rr *, void *)
, void *arg
)
{
ldns_dnssec_rrs *base_rrs = signatures;
ldns_dnssec_rrs *cur_rr = base_rrs;
ldns_dnssec_rrs *prev_rr = NULL;
ldns_dnssec_rrs *next_rr;
uint16_t keytag;
size_t i;
if (!cur_rr) {
switch(func(NULL, arg)) {
case LDNS_SIGNATURE_LEAVE_ADD_NEW:
case LDNS_SIGNATURE_REMOVE_ADD_NEW:
break;
case LDNS_SIGNATURE_LEAVE_NO_ADD:
case LDNS_SIGNATURE_REMOVE_NO_ADD:
ldns_key_list_set_use(key_list, false);
break;
default:
fprintf(stderr, "[XX] unknown return value from callback\n");
break;
}
return NULL;
}
(void)func(cur_rr->rr, arg);
while (cur_rr) {
next_rr = cur_rr->next;
switch (func(cur_rr->rr, arg)) {
case LDNS_SIGNATURE_LEAVE_ADD_NEW:
prev_rr = cur_rr;
break;
case LDNS_SIGNATURE_LEAVE_NO_ADD:
keytag = ldns_rdf2native_int16(
ldns_rr_rrsig_keytag(cur_rr->rr));
for (i = 0; i < ldns_key_list_key_count(key_list); i++) {
if (ldns_key_keytag(ldns_key_list_key(key_list, i)) ==
keytag) {
ldns_key_set_use(ldns_key_list_key(key_list, i),
false);
}
}
prev_rr = cur_rr;
break;
case LDNS_SIGNATURE_REMOVE_NO_ADD:
keytag = ldns_rdf2native_int16(
ldns_rr_rrsig_keytag(cur_rr->rr));
for (i = 0; i < ldns_key_list_key_count(key_list); i++) {
if (ldns_key_keytag(ldns_key_list_key(key_list, i))
== keytag) {
ldns_key_set_use(ldns_key_list_key(key_list, i),
false);
}
}
if (prev_rr) {
prev_rr->next = next_rr;
} else {
base_rrs = next_rr;
}
LDNS_FREE(cur_rr);
break;
case LDNS_SIGNATURE_REMOVE_ADD_NEW:
if (prev_rr) {
prev_rr->next = next_rr;
} else {
base_rrs = next_rr;
}
LDNS_FREE(cur_rr);
break;
default:
fprintf(stderr, "[XX] unknown return value from callback\n");
break;
}
cur_rr = next_rr;
}
return base_rrs;
}
#ifdef HAVE_SSL
ldns_status
ldns_dnssec_zone_create_rrsigs(ldns_dnssec_zone *zone,
ldns_rr_list *new_rrs,
ldns_key_list *key_list,
int (*func)(ldns_rr *, void*),
void *arg)
{
return ldns_dnssec_zone_create_rrsigs_flg(zone, new_rrs, key_list,
func, arg, 0);
}
/** If there are KSKs use only them and mark ZSKs unused */
static void
ldns_key_list_filter_for_dnskey(ldns_key_list *key_list)
{
int saw_ksk = 0;
size_t i;
for(i=0; i<ldns_key_list_key_count(key_list); i++)
if((ldns_key_flags(ldns_key_list_key(key_list, i))&LDNS_KEY_SEP_KEY)) {
saw_ksk = 1;
break;
}
if(!saw_ksk)
return;
for(i=0; i<ldns_key_list_key_count(key_list); i++)
if(!(ldns_key_flags(ldns_key_list_key(key_list, i))&LDNS_KEY_SEP_KEY))
ldns_key_set_use(ldns_key_list_key(key_list, i), 0);
}
/** If there are no ZSKs use KSK as ZSK */
static void
ldns_key_list_filter_for_non_dnskey(ldns_key_list *key_list)
{
int saw_zsk = 0;
size_t i;
for(i=0; i<ldns_key_list_key_count(key_list); i++)
if(!(ldns_key_flags(ldns_key_list_key(key_list, i))&LDNS_KEY_SEP_KEY)) {
saw_zsk = 1;
break;
}
if(!saw_zsk)
return;
/* else filter all KSKs */
for(i=0; i<ldns_key_list_key_count(key_list); i++)
if((ldns_key_flags(ldns_key_list_key(key_list, i))&LDNS_KEY_SEP_KEY))
ldns_key_set_use(ldns_key_list_key(key_list, i), 0);
}
ldns_status
ldns_dnssec_zone_create_rrsigs_flg( ATTR_UNUSED(ldns_dnssec_zone *zone)
, ATTR_UNUSED(ldns_rr_list *new_rrs)
, ATTR_UNUSED(ldns_key_list *key_list)
, int (*func)(ldns_rr *, void*)
, void *arg
, int flags
)
{
ldns_status result = LDNS_STATUS_OK;
ldns_rbnode_t *cur_node;
ldns_rr_list *rr_list;
ldns_dnssec_name *cur_name;
ldns_dnssec_rrsets *cur_rrset;
ldns_dnssec_rrs *cur_rr;
ldns_rr_list *siglist;
size_t i;
int on_delegation_point = 0; /* handle partially occluded names */
ldns_rr_list *pubkey_list = ldns_rr_list_new();
for (i = 0; i<ldns_key_list_key_count(key_list); i++) {
ldns_rr_list_push_rr( pubkey_list
, ldns_key2rr(ldns_key_list_key(
key_list, i))
);
}
/* TODO: callback to see is list should be signed */
/* TODO: remove 'old' signatures from signature list */
cur_node = ldns_rbtree_first(zone->names);
while (cur_node != LDNS_RBTREE_NULL) {
cur_name = (ldns_dnssec_name *) cur_node->data;
if (!cur_name->is_glue) {
on_delegation_point = ldns_dnssec_rrsets_contains_type(
cur_name->rrsets, LDNS_RR_TYPE_NS)
&& !ldns_dnssec_rrsets_contains_type(
cur_name->rrsets, LDNS_RR_TYPE_SOA);
cur_rrset = cur_name->rrsets;
while (cur_rrset) {
/* reset keys to use */
ldns_key_list_set_use(key_list, true);
/* walk through old sigs, remove the old,
and mark which keys (not) to use) */
cur_rrset->signatures =
ldns_dnssec_remove_signatures(cur_rrset->signatures,
key_list,
func,
arg);
if(!(flags&LDNS_SIGN_DNSKEY_WITH_ZSK) &&
cur_rrset->type == LDNS_RR_TYPE_DNSKEY)
ldns_key_list_filter_for_dnskey(key_list);
if(cur_rrset->type != LDNS_RR_TYPE_DNSKEY)
ldns_key_list_filter_for_non_dnskey(key_list);
/* TODO: just set count to zero? */
rr_list = ldns_rr_list_new();
cur_rr = cur_rrset->rrs;
while (cur_rr) {
ldns_rr_list_push_rr(rr_list, cur_rr->rr);
cur_rr = cur_rr->next;
}
/* only sign non-delegation RRsets */
/* (glue should have been marked earlier,
* except on the delegation points itself) */
if (!on_delegation_point ||
ldns_rr_list_type(rr_list)
== LDNS_RR_TYPE_DS ||
ldns_rr_list_type(rr_list)
== LDNS_RR_TYPE_NSEC ||
ldns_rr_list_type(rr_list)
== LDNS_RR_TYPE_NSEC3) {
siglist = ldns_sign_public(rr_list, key_list);
for (i = 0; i < ldns_rr_list_rr_count(siglist); i++) {
if (cur_rrset->signatures) {
result = ldns_dnssec_rrs_add_rr(cur_rrset->signatures,
ldns_rr_list_rr(siglist,
i));
} else {
cur_rrset->signatures = ldns_dnssec_rrs_new();
cur_rrset->signatures->rr =
ldns_rr_list_rr(siglist, i);
ldns_rr_list_push_rr(new_rrs,
ldns_rr_list_rr(siglist,
i));
}
}
ldns_rr_list_free(siglist);
}
ldns_rr_list_free(rr_list);
cur_rrset = cur_rrset->next;
}
/* sign the nsec */
ldns_key_list_set_use(key_list, true);
cur_name->nsec_signatures =
ldns_dnssec_remove_signatures(cur_name->nsec_signatures,
key_list,
func,
arg);
ldns_key_list_filter_for_non_dnskey(key_list);
rr_list = ldns_rr_list_new();
ldns_rr_list_push_rr(rr_list, cur_name->nsec);
siglist = ldns_sign_public(rr_list, key_list);
for (i = 0; i < ldns_rr_list_rr_count(siglist); i++) {
if (cur_name->nsec_signatures) {
result = ldns_dnssec_rrs_add_rr(cur_name->nsec_signatures,
ldns_rr_list_rr(siglist, i));
} else {
cur_name->nsec_signatures = ldns_dnssec_rrs_new();
cur_name->nsec_signatures->rr =
ldns_rr_list_rr(siglist, i);
ldns_rr_list_push_rr(new_rrs,
ldns_rr_list_rr(siglist, i));
}
}
ldns_rr_list_free(siglist);
ldns_rr_list_free(rr_list);
}
cur_node = ldns_rbtree_next(cur_node);
}
ldns_rr_list_deep_free(pubkey_list);
return result;
}
ldns_status
ldns_dnssec_zone_sign(ldns_dnssec_zone *zone,
ldns_rr_list *new_rrs,
ldns_key_list *key_list,
int (*func)(ldns_rr *, void *),
void *arg)
{
return ldns_dnssec_zone_sign_flg(zone, new_rrs, key_list, func, arg, 0);
}
ldns_status
ldns_dnssec_zone_sign_flg(ldns_dnssec_zone *zone,
ldns_rr_list *new_rrs,
ldns_key_list *key_list,
int (*func)(ldns_rr *, void *),
void *arg,
int flags)
{
ldns_status result = LDNS_STATUS_OK;
if (!zone || !new_rrs || !key_list) {
return LDNS_STATUS_ERR;
}
/* zone is already sorted */
result = ldns_dnssec_zone_mark_glue(zone);
if (result != LDNS_STATUS_OK) {
return result;
}
/* check whether we need to add nsecs */
if (zone->names && !((ldns_dnssec_name *)zone->names->root->data)->nsec) {
result = ldns_dnssec_zone_create_nsecs(zone, new_rrs);
if (result != LDNS_STATUS_OK) {
return result;
}
}
result = ldns_dnssec_zone_create_rrsigs_flg(zone,
new_rrs,
key_list,
func,
arg,
flags);
return result;
}
ldns_status
ldns_dnssec_zone_sign_nsec3(ldns_dnssec_zone *zone,
ldns_rr_list *new_rrs,
ldns_key_list *key_list,
int (*func)(ldns_rr *, void *),
void *arg,
uint8_t algorithm,
uint8_t flags,
uint16_t iterations,
uint8_t salt_length,
uint8_t *salt)
{
return ldns_dnssec_zone_sign_nsec3_flg_mkmap(zone, new_rrs, key_list,
func, arg, algorithm, flags, iterations, salt_length, salt, 0,
NULL);
}
ldns_status
ldns_dnssec_zone_sign_nsec3_flg_mkmap(ldns_dnssec_zone *zone,
ldns_rr_list *new_rrs,
ldns_key_list *key_list,
int (*func)(ldns_rr *, void *),
void *arg,
uint8_t algorithm,
uint8_t flags,
uint16_t iterations,
uint8_t salt_length,
uint8_t *salt,
int signflags,
ldns_rbtree_t **map)
{
ldns_rr *nsec3, *nsec3param;
ldns_status result = LDNS_STATUS_OK;
/* zone is already sorted */
result = ldns_dnssec_zone_mark_glue(zone);
if (result != LDNS_STATUS_OK) {
return result;
}
/* TODO if there are already nsec3s presents and their
* parameters are the same as these, we don't have to recreate
*/
if (zone->names) {
/* add empty nonterminals */
result = ldns_dnssec_zone_add_empty_nonterminals(zone);
if (result != LDNS_STATUS_OK) {
return result;
}
nsec3 = ((ldns_dnssec_name *)zone->names->root->data)->nsec;
if (nsec3 && ldns_rr_get_type(nsec3) == LDNS_RR_TYPE_NSEC3) {
/* no need to recreate */
} else {
if (!ldns_dnssec_zone_find_rrset(zone,
zone->soa->name,
LDNS_RR_TYPE_NSEC3PARAM)) {
/* create and add the nsec3param rr */
nsec3param =
ldns_rr_new_frm_type(LDNS_RR_TYPE_NSEC3PARAM);
ldns_rr_set_owner(nsec3param,
ldns_rdf_clone(zone->soa->name));
ldns_nsec3_add_param_rdfs(nsec3param,
algorithm,
flags,
iterations,
salt_length,
salt);
/* always set bit 7 of the flags to zero, according to
* rfc5155 section 11. The bits are counted from right to left,
* so bit 7 in rfc5155 is bit 0 in ldns */
ldns_set_bit(ldns_rdf_data(ldns_rr_rdf(nsec3param, 1)), 0, 0);
result = ldns_dnssec_zone_add_rr(zone, nsec3param);
if (result != LDNS_STATUS_OK) {
return result;
}
ldns_rr_list_push_rr(new_rrs, nsec3param);
}
result = ldns_dnssec_zone_create_nsec3s_mkmap(zone,
new_rrs,
algorithm,
flags,
iterations,
salt_length,
salt,
map);
if (result != LDNS_STATUS_OK) {
return result;
}
}
result = ldns_dnssec_zone_create_rrsigs_flg(zone,
new_rrs,
key_list,
func,
arg,
signflags);
}
return result;
}
ldns_status
ldns_dnssec_zone_sign_nsec3_flg(ldns_dnssec_zone *zone,
ldns_rr_list *new_rrs,
ldns_key_list *key_list,
int (*func)(ldns_rr *, void *),
void *arg,
uint8_t algorithm,
uint8_t flags,
uint16_t iterations,
uint8_t salt_length,
uint8_t *salt,
int signflags)
{
return ldns_dnssec_zone_sign_nsec3_flg_mkmap(zone, new_rrs, key_list,
func, arg, algorithm, flags, iterations, salt_length, salt,
signflags, NULL);
}
ldns_zone *
ldns_zone_sign(const ldns_zone *zone, ldns_key_list *key_list)
{
ldns_dnssec_zone *dnssec_zone;
ldns_zone *signed_zone;
ldns_rr_list *new_rrs;
size_t i;
signed_zone = ldns_zone_new();
dnssec_zone = ldns_dnssec_zone_new();
(void) ldns_dnssec_zone_add_rr(dnssec_zone, ldns_zone_soa(zone));
ldns_zone_set_soa(signed_zone, ldns_rr_clone(ldns_zone_soa(zone)));
for (i = 0; i < ldns_rr_list_rr_count(ldns_zone_rrs(zone)); i++) {
(void) ldns_dnssec_zone_add_rr(dnssec_zone,
ldns_rr_list_rr(ldns_zone_rrs(zone),
i));
ldns_zone_push_rr(signed_zone,
ldns_rr_clone(ldns_rr_list_rr(ldns_zone_rrs(zone),
i)));
}
new_rrs = ldns_rr_list_new();
(void) ldns_dnssec_zone_sign(dnssec_zone,
new_rrs,
key_list,
ldns_dnssec_default_replace_signatures,
NULL);
for (i = 0; i < ldns_rr_list_rr_count(new_rrs); i++) {
ldns_rr_list_push_rr(ldns_zone_rrs(signed_zone),
ldns_rr_clone(ldns_rr_list_rr(new_rrs, i)));
}
ldns_rr_list_deep_free(new_rrs);
ldns_dnssec_zone_free(dnssec_zone);
return signed_zone;
}
ldns_zone *
ldns_zone_sign_nsec3(ldns_zone *zone, ldns_key_list *key_list, uint8_t algorithm, uint8_t flags, uint16_t iterations, uint8_t salt_length, uint8_t *salt)
{
ldns_dnssec_zone *dnssec_zone;
ldns_zone *signed_zone;
ldns_rr_list *new_rrs;
size_t i;
signed_zone = ldns_zone_new();
dnssec_zone = ldns_dnssec_zone_new();
(void) ldns_dnssec_zone_add_rr(dnssec_zone, ldns_zone_soa(zone));
ldns_zone_set_soa(signed_zone, ldns_rr_clone(ldns_zone_soa(zone)));
for (i = 0; i < ldns_rr_list_rr_count(ldns_zone_rrs(zone)); i++) {
(void) ldns_dnssec_zone_add_rr(dnssec_zone,
ldns_rr_list_rr(ldns_zone_rrs(zone),
i));
ldns_zone_push_rr(signed_zone,
ldns_rr_clone(ldns_rr_list_rr(ldns_zone_rrs(zone),
i)));
}
new_rrs = ldns_rr_list_new();
(void) ldns_dnssec_zone_sign_nsec3(dnssec_zone,
new_rrs,
key_list,
ldns_dnssec_default_replace_signatures,
NULL,
algorithm,
flags,
iterations,
salt_length,
salt);
for (i = 0; i < ldns_rr_list_rr_count(new_rrs); i++) {
ldns_rr_list_push_rr(ldns_zone_rrs(signed_zone),
ldns_rr_clone(ldns_rr_list_rr(new_rrs, i)));
}
ldns_rr_list_deep_free(new_rrs);
ldns_dnssec_zone_free(dnssec_zone);
return signed_zone;
}
#endif /* HAVE_SSL */
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