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-rw-r--r--lib/dns/private.c417
1 files changed, 417 insertions, 0 deletions
diff --git a/lib/dns/private.c b/lib/dns/private.c
new file mode 100644
index 0000000..56573b3
--- /dev/null
+++ b/lib/dns/private.c
@@ -0,0 +1,417 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <stdbool.h>
+
+#include <isc/base64.h>
+#include <isc/print.h>
+#include <isc/result.h>
+#include <isc/string.h>
+#include <isc/types.h>
+#include <isc/util.h>
+
+#include <dns/nsec3.h>
+#include <dns/private.h>
+
+/*
+ * We need to build the relevant chain if there exists a NSEC/NSEC3PARAM
+ * at the apex; normally only one or the other of NSEC/NSEC3PARAM will exist.
+ *
+ * If a NSEC3PARAM RRset exists then we will need to build a NSEC chain
+ * if all the NSEC3PARAM records (and associated chains) are slated for
+ * destruction and we have not been told to NOT build the NSEC chain.
+ *
+ * If the NSEC set exist then check to see if there is a request to create
+ * a NSEC3 chain.
+ *
+ * If neither NSEC/NSEC3PARAM RRsets exist at the origin and the private
+ * type exists then we need to examine it to determine if NSEC3 chain has
+ * been requested to be built otherwise a NSEC chain needs to be built.
+ */
+
+#define REMOVE(x) (((x)&DNS_NSEC3FLAG_REMOVE) != 0)
+#define CREATE(x) (((x)&DNS_NSEC3FLAG_CREATE) != 0)
+#define INITIAL(x) (((x)&DNS_NSEC3FLAG_INITIAL) != 0)
+#define NONSEC(x) (((x)&DNS_NSEC3FLAG_NONSEC) != 0)
+
+#define CHECK(x) \
+ do { \
+ result = (x); \
+ if (result != ISC_R_SUCCESS) \
+ goto failure; \
+ } while (0)
+
+/*
+ * Work out if 'param' should be ignored or not (i.e. it is in the process
+ * of being removed).
+ *
+ * Note: we 'belt-and-braces' here by also checking for a CREATE private
+ * record and keep the param record in this case.
+ */
+
+static bool
+ignore(dns_rdata_t *param, dns_rdataset_t *privateset) {
+ isc_result_t result;
+
+ for (result = dns_rdataset_first(privateset); result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(privateset))
+ {
+ unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE];
+ dns_rdata_t private = DNS_RDATA_INIT;
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+
+ dns_rdataset_current(privateset, &private);
+ if (!dns_nsec3param_fromprivate(&private, &rdata, buf,
+ sizeof(buf)))
+ {
+ continue;
+ }
+ /*
+ * We are going to create a new NSEC3 chain so it
+ * doesn't matter if we are removing this one.
+ */
+ if (CREATE(rdata.data[1])) {
+ return (false);
+ }
+ if (rdata.data[0] != param->data[0] ||
+ rdata.data[2] != param->data[2] ||
+ rdata.data[3] != param->data[3] ||
+ rdata.data[4] != param->data[4] ||
+ memcmp(&rdata.data[5], &param->data[5], param->data[4]))
+ {
+ continue;
+ }
+ /*
+ * The removal of this NSEC3 chain does NOT cause a
+ * NSEC chain to be created so we don't need to tell
+ * the caller that it will be removed.
+ */
+ if (NONSEC(rdata.data[1])) {
+ return (false);
+ }
+ return (true);
+ }
+ return (false);
+}
+
+isc_result_t
+dns_private_chains(dns_db_t *db, dns_dbversion_t *ver,
+ dns_rdatatype_t privatetype, bool *build_nsec,
+ bool *build_nsec3) {
+ dns_dbnode_t *node;
+ dns_rdataset_t nsecset, nsec3paramset, privateset;
+ bool nsec3chain;
+ bool signing;
+ isc_result_t result;
+ unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE];
+ unsigned int count;
+
+ node = NULL;
+ dns_rdataset_init(&nsecset);
+ dns_rdataset_init(&nsec3paramset);
+ dns_rdataset_init(&privateset);
+
+ CHECK(dns_db_getoriginnode(db, &node));
+
+ result = dns_db_findrdataset(db, node, ver, dns_rdatatype_nsec, 0,
+ (isc_stdtime_t)0, &nsecset, NULL);
+
+ if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND) {
+ goto failure;
+ }
+
+ result = dns_db_findrdataset(db, node, ver, dns_rdatatype_nsec3param, 0,
+ (isc_stdtime_t)0, &nsec3paramset, NULL);
+ if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND) {
+ goto failure;
+ }
+
+ if (dns_rdataset_isassociated(&nsecset) &&
+ dns_rdataset_isassociated(&nsec3paramset))
+ {
+ if (build_nsec != NULL) {
+ *build_nsec = true;
+ }
+ if (build_nsec3 != NULL) {
+ *build_nsec3 = true;
+ }
+ goto success;
+ }
+
+ if (privatetype != (dns_rdatatype_t)0) {
+ result = dns_db_findrdataset(db, node, ver, privatetype, 0,
+ (isc_stdtime_t)0, &privateset,
+ NULL);
+ if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND) {
+ goto failure;
+ }
+ }
+
+ /*
+ * Look to see if we also need to be creating a NSEC3 chain.
+ */
+ if (dns_rdataset_isassociated(&nsecset)) {
+ if (build_nsec != NULL) {
+ *build_nsec = true;
+ }
+ if (build_nsec3 != NULL) {
+ *build_nsec3 = false;
+ }
+ if (!dns_rdataset_isassociated(&privateset)) {
+ goto success;
+ }
+ for (result = dns_rdataset_first(&privateset);
+ result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&privateset))
+ {
+ dns_rdata_t private = DNS_RDATA_INIT;
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+
+ dns_rdataset_current(&privateset, &private);
+ if (!dns_nsec3param_fromprivate(&private, &rdata, buf,
+ sizeof(buf)))
+ {
+ continue;
+ }
+ if (REMOVE(rdata.data[1])) {
+ continue;
+ }
+ if (build_nsec3 != NULL) {
+ *build_nsec3 = true;
+ }
+ break;
+ }
+ goto success;
+ }
+
+ if (dns_rdataset_isassociated(&nsec3paramset)) {
+ if (build_nsec3 != NULL) {
+ *build_nsec3 = true;
+ }
+ if (build_nsec != NULL) {
+ *build_nsec = false;
+ }
+ if (!dns_rdataset_isassociated(&privateset)) {
+ goto success;
+ }
+ /*
+ * If we are in the process of building a new NSEC3 chain
+ * then we don't need to build a NSEC chain.
+ */
+ for (result = dns_rdataset_first(&privateset);
+ result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&privateset))
+ {
+ dns_rdata_t private = DNS_RDATA_INIT;
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+
+ dns_rdataset_current(&privateset, &private);
+ if (!dns_nsec3param_fromprivate(&private, &rdata, buf,
+ sizeof(buf)))
+ {
+ continue;
+ }
+ if (CREATE(rdata.data[1])) {
+ goto success;
+ }
+ }
+
+ /*
+ * Check to see if there will be a active NSEC3CHAIN once
+ * the changes queued complete.
+ */
+ count = 0;
+ for (result = dns_rdataset_first(&nsec3paramset);
+ result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&nsec3paramset))
+ {
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+
+ /*
+ * If there is more that one NSEC3 chain present then
+ * we don't need to construct a NSEC chain.
+ */
+ if (++count > 1) {
+ goto success;
+ }
+ dns_rdataset_current(&nsec3paramset, &rdata);
+ if (ignore(&rdata, &privateset)) {
+ continue;
+ }
+ /*
+ * We still have a good NSEC3 chain or we are
+ * not creating a NSEC chain as NONSEC is set.
+ */
+ goto success;
+ }
+
+ /*
+ * The last NSEC3 chain is being removed and does not have
+ * have NONSEC set.
+ */
+ if (build_nsec != NULL) {
+ *build_nsec = true;
+ }
+ goto success;
+ }
+
+ if (build_nsec != NULL) {
+ *build_nsec = false;
+ }
+ if (build_nsec3 != NULL) {
+ *build_nsec3 = false;
+ }
+ if (!dns_rdataset_isassociated(&privateset)) {
+ goto success;
+ }
+
+ signing = false;
+ nsec3chain = false;
+
+ for (result = dns_rdataset_first(&privateset); result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&privateset))
+ {
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+ dns_rdata_t private = DNS_RDATA_INIT;
+
+ dns_rdataset_current(&privateset, &private);
+ if (!dns_nsec3param_fromprivate(&private, &rdata, buf,
+ sizeof(buf)))
+ {
+ /*
+ * Look for record that says we are signing the
+ * zone with a key.
+ */
+ if (private.length == 5 && private.data[0] != 0 &&
+ private.data[3] == 0 && private.data[4] == 0)
+ {
+ signing = true;
+ }
+ } else {
+ if (CREATE(rdata.data[1])) {
+ nsec3chain = true;
+ }
+ }
+ }
+
+ if (signing) {
+ if (nsec3chain) {
+ if (build_nsec3 != NULL) {
+ *build_nsec3 = true;
+ }
+ } else {
+ if (build_nsec != NULL) {
+ *build_nsec = true;
+ }
+ }
+ }
+
+success:
+ result = ISC_R_SUCCESS;
+failure:
+ if (dns_rdataset_isassociated(&nsecset)) {
+ dns_rdataset_disassociate(&nsecset);
+ }
+ if (dns_rdataset_isassociated(&nsec3paramset)) {
+ dns_rdataset_disassociate(&nsec3paramset);
+ }
+ if (dns_rdataset_isassociated(&privateset)) {
+ dns_rdataset_disassociate(&privateset);
+ }
+ if (node != NULL) {
+ dns_db_detachnode(db, &node);
+ }
+ return (result);
+}
+
+isc_result_t
+dns_private_totext(dns_rdata_t *private, isc_buffer_t *buf) {
+ isc_result_t result;
+
+ if (private->length < 5) {
+ return (ISC_R_NOTFOUND);
+ }
+
+ if (private->data[0] == 0) {
+ unsigned char nsec3buf[DNS_NSEC3PARAM_BUFFERSIZE];
+ unsigned char newbuf[DNS_NSEC3PARAM_BUFFERSIZE];
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+ dns_rdata_nsec3param_t nsec3param;
+ bool del, init, nonsec;
+ isc_buffer_t b;
+
+ if (!dns_nsec3param_fromprivate(private, &rdata, nsec3buf,
+ sizeof(nsec3buf)))
+ {
+ CHECK(ISC_R_FAILURE);
+ }
+
+ CHECK(dns_rdata_tostruct(&rdata, &nsec3param, NULL));
+
+ del = ((nsec3param.flags & DNS_NSEC3FLAG_REMOVE) != 0);
+ init = ((nsec3param.flags & DNS_NSEC3FLAG_INITIAL) != 0);
+ nonsec = ((nsec3param.flags & DNS_NSEC3FLAG_NONSEC) != 0);
+
+ nsec3param.flags &=
+ ~(DNS_NSEC3FLAG_CREATE | DNS_NSEC3FLAG_REMOVE |
+ DNS_NSEC3FLAG_INITIAL | DNS_NSEC3FLAG_NONSEC);
+
+ if (init) {
+ isc_buffer_putstr(buf, "Pending NSEC3 chain ");
+ } else if (del) {
+ isc_buffer_putstr(buf, "Removing NSEC3 chain ");
+ } else {
+ isc_buffer_putstr(buf, "Creating NSEC3 chain ");
+ }
+
+ dns_rdata_reset(&rdata);
+ isc_buffer_init(&b, newbuf, sizeof(newbuf));
+ CHECK(dns_rdata_fromstruct(&rdata, dns_rdataclass_in,
+ dns_rdatatype_nsec3param,
+ &nsec3param, &b));
+
+ CHECK(dns_rdata_totext(&rdata, NULL, buf));
+
+ if (del && !nonsec) {
+ isc_buffer_putstr(buf, " / creating NSEC chain");
+ }
+ } else if (private->length == 5) {
+ unsigned char alg = private->data[0];
+ dns_keytag_t keyid = (private->data[2] | private->data[1] << 8);
+ char keybuf[DNS_SECALG_FORMATSIZE + BUFSIZ],
+ algbuf[DNS_SECALG_FORMATSIZE];
+ bool del = private->data[3];
+ bool complete = private->data[4];
+
+ if (del && complete) {
+ isc_buffer_putstr(buf, "Done removing signatures for ");
+ } else if (del) {
+ isc_buffer_putstr(buf, "Removing signatures for ");
+ } else if (complete) {
+ isc_buffer_putstr(buf, "Done signing with ");
+ } else {
+ isc_buffer_putstr(buf, "Signing with ");
+ }
+
+ dns_secalg_format(alg, algbuf, sizeof(algbuf));
+ snprintf(keybuf, sizeof(keybuf), "key %d/%s", keyid, algbuf);
+ isc_buffer_putstr(buf, keybuf);
+ } else {
+ return (ISC_R_NOTFOUND);
+ }
+
+ isc_buffer_putuint8(buf, 0);
+ result = ISC_R_SUCCESS;
+failure:
+ return (result);
+}
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