isc_result_t
dns_tsigkey_find(dns_tsigkey_t **tsigkey, dns_name_t *name,
dns_name_t *algorithm, dns_tsig_keyring_t *ring)
{
dns_tsigkey_t *key;
isc_stdtime_t now;
isc_result_t result;
REQUIRE(tsigkey != NULL);
REQUIRE(*tsigkey == NULL);
REQUIRE(name != NULL);
REQUIRE(ring != NULL);
RWLOCK(&ring->lock, isc_rwlocktype_write);
cleanup_ring(ring);
RWUNLOCK(&ring->lock, isc_rwlocktype_write);
isc_stdtime_get(&now);
RWLOCK(&ring->lock, isc_rwlocktype_read);
key = NULL;
result = dns_rbt_findname(ring->keys, name, 0, NULL, (void *)&key);
if (result == DNS_R_PARTIALMATCH || result == ISC_R_NOTFOUND) {
RWUNLOCK(&ring->lock, isc_rwlocktype_read);
return (ISC_R_NOTFOUND);
}
if (algorithm != NULL && !dns_name_equal(key->algorithm, algorithm)) {
RWUNLOCK(&ring->lock, isc_rwlocktype_read);
return (ISC_R_NOTFOUND);
}
if (key->inception != key->expire && isc_serial_lt(key->expire, now)) {
/*
* The key has expired.
*/
RWUNLOCK(&ring->lock, isc_rwlocktype_read);
RWLOCK(&ring->lock, isc_rwlocktype_write);
remove_fromring(key);
RWUNLOCK(&ring->lock, isc_rwlocktype_write);
return (ISC_R_NOTFOUND);
}
#if 0
/*
* MPAXXX We really should look at the inception time.
*/
if (key->inception != key->expire &&
isc_serial_lt(key->inception, now)) {
RWUNLOCK(&ring->lock, isc_rwlocktype_read);
adjust_lru(key);
return (ISC_R_NOTFOUND);
}
#endif
isc_refcount_increment(&key->refs, NULL);
RWUNLOCK(&ring->lock, isc_rwlocktype_read);
adjust_lru(key);
*tsigkey = key;
return (ISC_R_SUCCESS);
}
int main ()
{
isc_uint32_t a, b;
char buf[1024];
char *s, *e;
while (fgets (buf, sizeof (buf), stdin) != NULL)
{
buf[sizeof (buf) - 1] = '\0';
s = buf;
a = strtoul (s, &e, 0);
if (s == e)
continue;
s = e;
b = strtoul (s, &e, 0);
if (s == e)
continue;
fprintf (stdout, "%u %u gt:%d lt:%d ge:%d le:%d eq:%d ne:%d\n",
a, b,
isc_serial_gt (a, b), isc_serial_lt (a, b),
isc_serial_ge (a, b), isc_serial_le (a, b), isc_serial_eq (a, b), isc_serial_ne (a, b));
}
return (0);
}
static isc_result_t
restore_key(dns_tsig_keyring_t *ring, isc_stdtime_t now, FILE *fp) {
dst_key_t *dstkey = NULL;
char namestr[1024];
char creatorstr[1024];
char algorithmstr[1024];
char keystr[4096];
unsigned int inception, expire;
int n;
isc_buffer_t b;
dns_name_t *name, *creator, *algorithm;
dns_fixedname_t fname, fcreator, falgorithm;
isc_result_t result;
unsigned int dstalg;
n = fscanf(fp, "%1023s %1023s %u %u %1023s %4095s\n", namestr,
creatorstr, &inception, &expire, algorithmstr, keystr);
if (n == EOF)
return (ISC_R_NOMORE);
if (n != 6)
return (ISC_R_FAILURE);
if (isc_serial_lt(expire, now))
return (DNS_R_EXPIRED);
dns_fixedname_init(&fname);
name = dns_fixedname_name(&fname);
isc_buffer_init(&b, namestr, strlen(namestr));
isc_buffer_add(&b, strlen(namestr));
result = dns_name_fromtext(name, &b, dns_rootname, 0, NULL);
if (result != ISC_R_SUCCESS)
return (result);
dns_fixedname_init(&fcreator);
creator = dns_fixedname_name(&fcreator);
isc_buffer_init(&b, creatorstr, strlen(creatorstr));
isc_buffer_add(&b, strlen(creatorstr));
result = dns_name_fromtext(creator, &b, dns_rootname, 0, NULL);
if (result != ISC_R_SUCCESS)
return (result);
dns_fixedname_init(&falgorithm);
algorithm = dns_fixedname_name(&falgorithm);
isc_buffer_init(&b, algorithmstr, strlen(algorithmstr));
isc_buffer_add(&b, strlen(algorithmstr));
result = dns_name_fromtext(algorithm, &b, dns_rootname, 0, NULL);
if (result != ISC_R_SUCCESS)
return (result);
dstalg = dst_alg_fromname(algorithm);
if (dstalg == 0)
return (DNS_R_BADALG);
result = dst_key_restore(name, dstalg, DNS_KEYOWNER_ENTITY,
DNS_KEYPROTO_DNSSEC, dns_rdataclass_in,
ring->mctx, keystr, &dstkey);
if (result != ISC_R_SUCCESS)
return (result);
result = dns_tsigkey_createfromkey(name, algorithm, dstkey,
ISC_TRUE, creator, inception,
expire, ring->mctx, ring, NULL);
if (dstkey != NULL)
dst_key_free(&dstkey);
return (result);
}
isc_result_t
dns_dnssec_verifymessage(isc_buffer_t *source, dns_message_t *msg,
dst_key_t *key)
{
dns_rdata_sig_t sig; /* SIG(0) */
unsigned char header[DNS_MESSAGE_HEADERLEN];
dns_rdata_t rdata = DNS_RDATA_INIT;
isc_region_t r, source_r, sig_r, header_r;
isc_stdtime_t now;
dst_context_t *ctx = NULL;
isc_mem_t *mctx;
isc_result_t result;
isc_uint16_t addcount;
isc_boolean_t signeedsfree = ISC_FALSE;
REQUIRE(source != NULL);
REQUIRE(msg != NULL);
REQUIRE(key != NULL);
mctx = msg->mctx;
msg->verify_attempted = 1;
if (is_response(msg)) {
if (msg->query.base == NULL)
return (DNS_R_UNEXPECTEDTSIG);
}
isc_buffer_usedregion(source, &source_r);
RETERR(dns_rdataset_first(msg->sig0));
dns_rdataset_current(msg->sig0, &rdata);
RETERR(dns_rdata_tostruct(&rdata, &sig, NULL));
signeedsfree = ISC_TRUE;
if (sig.labels != 0) {
result = DNS_R_SIGINVALID;
goto failure;
}
if (isc_serial_lt(sig.timeexpire, sig.timesigned)) {
result = DNS_R_SIGINVALID;
msg->sig0status = dns_tsigerror_badtime;
goto failure;
}
isc_stdtime_get(&now);
if (isc_serial_lt((isc_uint32_t)now, sig.timesigned)) {
result = DNS_R_SIGFUTURE;
msg->sig0status = dns_tsigerror_badtime;
goto failure;
}
else if (isc_serial_lt(sig.timeexpire, (isc_uint32_t)now)) {
result = DNS_R_SIGEXPIRED;
msg->sig0status = dns_tsigerror_badtime;
goto failure;
}
if (!dns_name_equal(dst_key_name(key), &sig.signer)) {
result = DNS_R_SIGINVALID;
msg->sig0status = dns_tsigerror_badkey;
goto failure;
}
RETERR(dst_context_create(key, mctx, &ctx));
/*
* Digest the SIG(0) record, except for the signature.
*/
dns_rdata_toregion(&rdata, &r);
r.length -= sig.siglen;
RETERR(dst_context_adddata(ctx, &r));
/*
* If this is a response, digest the query.
*/
if (is_response(msg))
RETERR(dst_context_adddata(ctx, &msg->query));
/*
* Extract the header.
*/
memcpy(header, source_r.base, DNS_MESSAGE_HEADERLEN);
/*
* Decrement the additional field counter.
*/
memcpy(&addcount, &header[DNS_MESSAGE_HEADERLEN - 2], 2);
addcount = htons((isc_uint16_t)(ntohs(addcount) - 1));
memcpy(&header[DNS_MESSAGE_HEADERLEN - 2], &addcount, 2);
/*
* Digest the modified header.
*/
header_r.base = (unsigned char *) header;
header_r.length = DNS_MESSAGE_HEADERLEN;
RETERR(dst_context_adddata(ctx, &header_r));
/*
* Digest all non-SIG(0) records.
*/
r.base = source_r.base + DNS_MESSAGE_HEADERLEN;
r.length = msg->sigstart - DNS_MESSAGE_HEADERLEN;
RETERR(dst_context_adddata(ctx, &r));
sig_r.base = sig.signature;
sig_r.length = sig.siglen;
result = dst_context_verify(ctx, &sig_r);
if (result != ISC_R_SUCCESS) {
msg->sig0status = dns_tsigerror_badsig;
goto failure;
}
msg->verified_sig = 1;
dst_context_destroy(&ctx);
dns_rdata_freestruct(&sig);
return (ISC_R_SUCCESS);
failure:
if (signeedsfree)
dns_rdata_freestruct(&sig);
if (ctx != NULL)
dst_context_destroy(&ctx);
return (result);
}
isc_result_t
dns_dnssec_verify2(dns_name_t *name, dns_rdataset_t *set, dst_key_t *key,
isc_boolean_t ignoretime, isc_mem_t *mctx,
dns_rdata_t *sigrdata, dns_name_t *wild)
{
dns_rdata_rrsig_t sig;
dns_fixedname_t fnewname;
isc_region_t r;
isc_buffer_t envbuf;
dns_rdata_t *rdatas;
int nrdatas, i;
isc_stdtime_t now;
isc_result_t ret;
unsigned char data[300];
dst_context_t *ctx = NULL;
int labels = 0;
isc_uint32_t flags;
REQUIRE(name != NULL);
REQUIRE(set != NULL);
REQUIRE(key != NULL);
REQUIRE(mctx != NULL);
REQUIRE(sigrdata != NULL && sigrdata->type == dns_rdatatype_rrsig);
ret = dns_rdata_tostruct(sigrdata, &sig, NULL);
if (ret != ISC_R_SUCCESS)
return (ret);
if (isc_serial_lt(sig.timeexpire, sig.timesigned))
return (DNS_R_SIGINVALID);
if (!ignoretime) {
isc_stdtime_get(&now);
/*
* Is SIG temporally valid?
*/
if (isc_serial_lt((isc_uint32_t)now, sig.timesigned))
return (DNS_R_SIGFUTURE);
else if (isc_serial_lt(sig.timeexpire, (isc_uint32_t)now))
return (DNS_R_SIGEXPIRED);
}
/*
* Is the key allowed to sign data?
*/
flags = dst_key_flags(key);
if (flags & DNS_KEYTYPE_NOAUTH)
return (DNS_R_KEYUNAUTHORIZED);
if ((flags & DNS_KEYFLAG_OWNERMASK) != DNS_KEYOWNER_ZONE)
return (DNS_R_KEYUNAUTHORIZED);
ret = dst_context_create(key, mctx, &ctx);
if (ret != ISC_R_SUCCESS)
goto cleanup_struct;
/*
* Digest the SIG rdata (not including the signature).
*/
ret = digest_sig(ctx, sigrdata, &sig);
if (ret != ISC_R_SUCCESS)
goto cleanup_context;
/*
* If the name is an expanded wildcard, use the wildcard name.
*/
dns_fixedname_init(&fnewname);
labels = dns_name_countlabels(name) - 1;
RUNTIME_CHECK(dns_name_downcase(name, dns_fixedname_name(&fnewname),
NULL) == ISC_R_SUCCESS);
if (labels - sig.labels > 0)
dns_name_split(dns_fixedname_name(&fnewname), sig.labels + 1,
NULL, dns_fixedname_name(&fnewname));
dns_name_toregion(dns_fixedname_name(&fnewname), &r);
/*
* Create an envelope for each rdata: <name|type|class|ttl>.
*/
isc_buffer_init(&envbuf, data, sizeof(data));
if (labels - sig.labels > 0) {
isc_buffer_putuint8(&envbuf, 1);
isc_buffer_putuint8(&envbuf, '*');
memcpy(data + 2, r.base, r.length);
}
else
memcpy(data, r.base, r.length);
isc_buffer_add(&envbuf, r.length);
isc_buffer_putuint16(&envbuf, set->type);
isc_buffer_putuint16(&envbuf, set->rdclass);
isc_buffer_putuint32(&envbuf, sig.originalttl);
ret = rdataset_to_sortedarray(set, mctx, &rdatas, &nrdatas);
if (ret != ISC_R_SUCCESS)
goto cleanup_context;
isc_buffer_usedregion(&envbuf, &r);
for (i = 0; i < nrdatas; i++) {
isc_uint16_t len;
isc_buffer_t lenbuf;
isc_region_t lenr;
/*
* Skip duplicates.
*/
if (i > 0 && dns_rdata_compare(&rdatas[i], &rdatas[i-1]) == 0)
continue;
/*
* Digest the envelope.
*/
ret = dst_context_adddata(ctx, &r);
if (ret != ISC_R_SUCCESS)
goto cleanup_array;
/*
* Digest the rdata length.
*/
isc_buffer_init(&lenbuf, &len, sizeof(len));
INSIST(rdatas[i].length < 65536);
isc_buffer_putuint16(&lenbuf, (isc_uint16_t)rdatas[i].length);
isc_buffer_usedregion(&lenbuf, &lenr);
/*
* Digest the rdata.
*/
ret = dst_context_adddata(ctx, &lenr);
if (ret != ISC_R_SUCCESS)
goto cleanup_array;
ret = dns_rdata_digest(&rdatas[i], digest_callback, ctx);
if (ret != ISC_R_SUCCESS)
goto cleanup_array;
}
r.base = sig.signature;
r.length = sig.siglen;
ret = dst_context_verify(ctx, &r);
if (ret == DST_R_VERIFYFAILURE)
ret = DNS_R_SIGINVALID;
cleanup_array:
isc_mem_put(mctx, rdatas, nrdatas * sizeof(dns_rdata_t));
cleanup_context:
dst_context_destroy(&ctx);
cleanup_struct:
dns_rdata_freestruct(&sig);
if (ret == ISC_R_SUCCESS && labels - sig.labels > 0) {
if (wild != NULL)
RUNTIME_CHECK(dns_name_concatenate(dns_wildcardname,
dns_fixedname_name(&fnewname),
wild, NULL) == ISC_R_SUCCESS);
ret = DNS_R_FROMWILDCARD;
}
return (ret);
}
isc_boolean_t
isc_serial_le(isc_uint32_t a, isc_uint32_t b) {
return ((a == b) ? ISC_TRUE : isc_serial_lt(a, b));
}
