/* $NetBSD: validator.c,v 1.13 2023/06/26 22:03:00 christos Exp $ */
/*
* 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 <inttypes.h>
#include <stdbool.h>
#include <isc/base32.h>
#include <isc/md.h>
#include <isc/mem.h>
#include <isc/print.h>
#include <isc/string.h>
#include <isc/task.h>
#include <isc/util.h>
#include <dns/client.h>
#include <dns/db.h>
#include <dns/dnssec.h>
#include <dns/ds.h>
#include <dns/events.h>
#include <dns/keytable.h>
#include <dns/keyvalues.h>
#include <dns/log.h>
#include <dns/message.h>
#include <dns/ncache.h>
#include <dns/nsec.h>
#include <dns/nsec3.h>
#include <dns/rdata.h>
#include <dns/rdataset.h>
#include <dns/rdatatype.h>
#include <dns/resolver.h>
#include <dns/result.h>
#include <dns/validator.h>
#include <dns/view.h>
/*! \file
* \brief
* Basic processing sequences:
*
* \li When called with rdataset and sigrdataset:
* validator_start -> validate_answer -> proveunsecure
* validator_start -> validate_answer -> validate_nx (if secure wildcard)
*
* \li When called with rdataset but no sigrdataset:
* validator_start -> proveunsecure
*
* \li When called with no rdataset or sigrdataset:
* validator_start -> validate_nx-> proveunsecure
*
* validator_start: determine what type of validation to do.
* validate_answer: attempt to perform a positive validation.
* proveunsecure: attempt to prove the answer comes from an unsecure zone.
* validate_nx: attempt to prove a negative response.
*/
#define VALIDATOR_MAGIC ISC_MAGIC('V', 'a', 'l', '?')
#define VALID_VALIDATOR(v) ISC_MAGIC_VALID(v, VALIDATOR_MAGIC)
#define VALATTR_SHUTDOWN 0x0001 /*%< Shutting down. */
#define VALATTR_CANCELED 0x0002 /*%< Canceled. */
#define VALATTR_TRIEDVERIFY \
0x0004 /*%< We have found a key and \
* have attempted a verify. */
#define VALATTR_INSECURITY 0x0010 /*%< Attempting proveunsecure. */
/*!
* NSEC proofs to be looked for.
*/
#define VALATTR_NEEDNOQNAME 0x00000100
#define VALATTR_NEEDNOWILDCARD 0x00000200
#define VALATTR_NEEDNODATA 0x00000400
/*!
* NSEC proofs that have been found.
*/
#define VALATTR_FOUNDNOQNAME 0x00001000
#define VALATTR_FOUNDNOWILDCARD 0x00002000
#define VALATTR_FOUNDNODATA 0x00004000
#define VALATTR_FOUNDCLOSEST 0x00008000
#define VALATTR_FOUNDOPTOUT 0x00010000
#define VALATTR_FOUNDUNKNOWN 0x00020000
#define NEEDNODATA(val) ((val->attributes & VALATTR_NEEDNODATA) != 0)
#define NEEDNOQNAME(val) ((val->attributes & VALATTR_NEEDNOQNAME) != 0)
#define NEEDNOWILDCARD(val) ((val->attributes & VALATTR_NEEDNOWILDCARD) != 0)
#define FOUNDNODATA(val) ((val->attributes & VALATTR_FOUNDNODATA) != 0)
#define FOUNDNOQNAME(val) ((val->attributes & VALATTR_FOUNDNOQNAME) != 0)
#define FOUNDNOWILDCARD(val) ((val->attributes & VALATTR_FOUNDNOWILDCARD) != 0)
#define FOUNDCLOSEST(val) ((val->attributes & VALATTR_FOUNDCLOSEST) != 0)
#define FOUNDOPTOUT(val) ((val->attributes & VALATTR_FOUNDOPTOUT) != 0)
#define SHUTDOWN(v) (((v)->attributes & VALATTR_SHUTDOWN) != 0)
#define CANCELED(v) (((v)->attributes & VALATTR_CANCELED) != 0)
#define NEGATIVE(r) (((r)->attributes & DNS_RDATASETATTR_NEGATIVE) != 0)
#define NXDOMAIN(r) (((r)->attributes & DNS_RDATASETATTR_NXDOMAIN) != 0)
static void
destroy(dns_validator_t *val);
static isc_result_t
select_signing_key(dns_validator_t *val, dns_rdataset_t *rdataset);
static isc_result_t
validate_answer(dns_validator_t *val, bool resume);
static isc_result_t
validate_dnskey(dns_validator_t *val);
static isc_result_t
validate_nx(dns_validator_t *val, bool resume);
static isc_result_t
proveunsecure(dns_validator_t *val, bool have_ds, bool resume);
static void
validator_logv(dns_validator_t *val, isc_logcategory_t *category,
isc_logmodule_t *module, int level, const char *fmt, va_list ap)
ISC_FORMAT_PRINTF(5, 0);
static void
validator_log(void *val, int level, const char *fmt, ...)
ISC_FORMAT_PRINTF(3, 4);
static void
validator_logcreate(dns_validator_t *val, dns_name_t *name,
dns_rdatatype_t type, const char *caller,
const char *operation);
/*%
* Ensure the validator's rdatasets are marked as expired.
*/
static void
expire_rdatasets(dns_validator_t *val) {
if (dns_rdataset_isassociated(&val->frdataset)) {
dns_rdataset_expire(&val->frdataset);
}
if (dns_rdataset_isassociated(&val->fsigrdataset)) {
dns_rdataset_expire(&val->fsigrdataset);
}
}
/*%
* Ensure the validator's rdatasets are disassociated.
*/
static void
disassociate_rdatasets(dns_validator_t *val) {
if (dns_rdataset_isassociated(&val->fdsset)) {
dns_rdataset_disassociate(&val->fdsset);
}
if (dns_rdataset_isassociated(&val->frdataset)) {
dns_rdataset_disassociate(&val->frdataset);
}
if (dns_rdataset_isassociated(&val->fsigrdataset)) {
dns_rdataset_disassociate(&val->fsigrdataset);
}
}
/*%
* Mark the rdatasets in val->event with trust level "answer",
* indicating that they did not validate, but could be cached as insecure.
*
* If we are validating a name that is marked as "must be secure", log a
* warning and return DNS_R_MUSTBESECURE instead.
*/
static isc_result_t
markanswer(dns_validator_t *val, const char *where, const char *mbstext) {
if (val->mustbesecure && mbstext != NULL) {
validator_log(val, ISC_LOG_WARNING,
"must be secure failure, %s", mbstext);
return (DNS_R_MUSTBESECURE);
}
validator_log(val, ISC_LOG_DEBUG(3), "marking as answer (%s)", where);
if (val->event->rdataset != NULL) {
dns_rdataset_settrust(val->event->rdataset, dns_trust_answer);
}
if (val->event->sigrdataset != NULL) {
dns_rdataset_settrust(val->event->sigrdataset,
dns_trust_answer);
}
return (ISC_R_SUCCESS);
}
/*%
* Mark the RRsets in val->event with trust level secure.
*/
static void
marksecure(dns_validatorevent_t *event) {
dns_rdataset_settrust(event->rdataset, dns_trust_secure);
if (event->sigrdataset != NULL) {
dns_rdataset_settrust(event->sigrdataset, dns_trust_secure);
}
event->secure = true;
}
/*
* Validator 'val' is finished; send the completion event to the task
* that called dns_validator_create(), with result `result`.
*/
static void
validator_done(dns_validator_t *val, isc_result_t result) {
isc_task_t *task;
if (val->event == NULL) {
return;
}
/*
* Caller must be holding the lock.
*/
val->event->result = result;
task = val->event->ev_sender;
val->event->ev_sender = val;
val->event->ev_type = DNS_EVENT_VALIDATORDONE;
val->event->ev_action = val->action;
val->event->ev_arg = val->arg;
isc_task_sendanddetach(&task, (isc_event_t **)(void *)&val->event);
}
/*
* Called when deciding whether to destroy validator 'val'.
*/
static bool
exit_check(dns_validator_t *val) {
/*
* Caller must be holding the lock.
*/
if (!SHUTDOWN(val)) {
return (false);
}
INSIST(val->event == NULL);
if (val->fetch != NULL || val->subvalidator != NULL) {
return (false);
}
return (true);
}
/*%
* Look in the NSEC record returned from a DS query to see if there is
* a NS RRset at this name. If it is found we are at a delegation point.
*/
static bool
isdelegation(dns_name_t *name, dns_rdataset_t *rdataset,
isc_result_t dbresult) {
dns_fixedname_t fixed;
dns_label_t hashlabel;
dns_name_t nsec3name;
dns_rdata_nsec3_t nsec3;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdataset_t set;
int order;
int scope;
bool found;
isc_buffer_t buffer;
isc_result_t result;
unsigned char hash[NSEC3_MAX_HASH_LENGTH];
unsigned char owner[NSEC3_MAX_HASH_LENGTH];
unsigned int length;
REQUIRE(dbresult == DNS_R_NXRRSET || dbresult == DNS_R_NCACHENXRRSET);
dns_rdataset_init(&set);
if (dbresult == DNS_R_NXRRSET) {
dns_rdataset_clone(rdataset, &set);
} else {
result = dns_ncache_getrdataset(rdataset, name,
dns_rdatatype_nsec, &set);
if (result == ISC_R_NOTFOUND) {
goto trynsec3;
}
if (result != ISC_R_SUCCESS) {
return (false);
}
}
INSIST(set.type == dns_rdatatype_nsec);
found = false;
result = dns_rdataset_first(&set);
if (result == ISC_R_SUCCESS) {
dns_rdataset_current(&set, &rdata);
found = dns_nsec_typepresent(&rdata, dns_rdatatype_ns);
dns_rdata_reset(&rdata);
}
dns_rdataset_disassociate(&set);
return (found);
trynsec3:
/*
* Iterate over the ncache entry.
*/
found = false;
dns_name_init(&nsec3name, NULL);
dns_fixedname_init(&fixed);
dns_name_downcase(name, dns_fixedname_name(&fixed), NULL);
name = dns_fixedname_name(&fixed);
for (result = dns_rdataset_first(rdataset); result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset))
{
dns_ncache_current(rdataset, &nsec3name, &set);
if (set.type != dns_rdatatype_nsec3) {
dns_rdataset_disassociate(&set);
continue;
}
dns_name_getlabel(&nsec3name, 0, &hashlabel);
isc_region_consume(&hashlabel, 1);
isc_buffer_init(&buffer, owner, sizeof(owner));
result = isc_base32hexnp_decoderegion(&hashlabel, &buffer);
if (result != ISC_R_SUCCESS) {
dns_rdataset_disassociate(&set);
continue;
}
for (result = dns_rdataset_first(&set); result == ISC_R_SUCCESS;
result = dns_rdataset_next(&set))
{
dns_rdata_reset(&rdata);
dns_rdataset_current(&set, &rdata);
(void)dns_rdata_tostruct(&rdata, &nsec3, NULL);
if (nsec3.hash != 1) {
continue;
}
length = isc_iterated_hash(
hash, nsec3.hash, nsec3.iterations, nsec3.salt,
nsec3.salt_length, name->ndata, name->length);
if (length != isc_buffer_usedlength(&buffer)) {
continue;
}
order = memcmp(hash, owner, length);
if (order == 0) {
found = dns_nsec3_typepresent(&rdata,
dns_rdatatype_ns);
dns_rdataset_disassociate(&set);
return (found);
}
if ((nsec3.flags & DNS_NSEC3FLAG_OPTOUT) == 0) {
continue;
}
/*
* Does this optout span cover the name?
*/
scope = memcmp(owner, nsec3.next, nsec3.next_length);
if ((scope < 0 && order > 0 &&
memcmp(hash, nsec3.next, length) < 0) ||
(scope >= 0 &&
(order > 0 ||
memcmp(hash, nsec3.next, length) < 0)))
{
dns_rdataset_disassociate(&set);
return (true);
}
}
dns_rdataset_disassociate(&set);
}
return (found);
}
/*%
* We have been asked to look for a key.
* If found, resume the validation process.
* If not found, fail the validation process.
*/
static void
fetch_callback_dnskey(isc_task_t *task, isc_event_t *event) {
dns_fetchevent_t *devent;
dns_validator_t *val;
dns_rdataset_t *rdataset;
bool want_destroy;
isc_result_t result;
isc_result_t eresult;
isc_result_t saved_result;
dns_fetch_t *fetch;
UNUSED(task);
INSIST(event->ev_type == DNS_EVENT_FETCHDONE);
devent = (dns_fetchevent_t *)event;
val = devent->ev_arg;
rdataset = &val->frdataset;
eresult = devent->result;
/* Free resources which are not of interest. */
if (devent->node != NULL) {
dns_db_detachnode(devent->db, &devent->node);
}
if (devent->db != NULL) {
dns_db_detach(&devent->db);
}
if (dns_rdataset_isassociated(&val->fsigrdataset)) {
dns_rdataset_disassociate(&val->fsigrdataset);
}
isc_event_free(&event);
INSIST(val->event != NULL);
validator_log(val, ISC_LOG_DEBUG(3), "in fetch_callback_dnskey");
LOCK(&val->lock);
fetch = val->fetch;
val->fetch = NULL;
if (CANCELED(val)) {
validator_done(val, ISC_R_CANCELED);
} else if (eresult == ISC_R_SUCCESS || eresult == DNS_R_NCACHENXRRSET) {
/*
* We have an answer to our DNSKEY query. Either the DNSKEY
* RRset or a NODATA response.
*/
validator_log(val, ISC_LOG_DEBUG(3), "%s with trust %s",
eresult == ISC_R_SUCCESS ? "keyset"
: "NCACHENXRRSET",
dns_trust_totext(rdataset->trust));
/*
* Only extract the dst key if the keyset exists and is secure.
*/
if (eresult == ISC_R_SUCCESS &&
rdataset->trust >= dns_trust_secure)
{
result = select_signing_key(val, rdataset);
if (result == ISC_R_SUCCESS) {
val->keyset = &val->frdataset;
}
}
result = validate_answer(val, true);
if (result == DNS_R_NOVALIDSIG &&
(val->attributes & VALATTR_TRIEDVERIFY) == 0)
{
saved_result = result;
validator_log(val, ISC_LOG_DEBUG(3),
"falling back to insecurity proof");
result = proveunsecure(val, false, false);
if (result == DNS_R_NOTINSECURE) {
result = saved_result;
}
}
if (result != DNS_R_WAIT) {
validator_done(val, result);
}
} else {
validator_log(val, ISC_LOG_DEBUG(3),
"fetch_callback_dnskey: got %s",
isc_result_totext(eresult));
if (eresult == ISC_R_CANCELED) {
validator_done(val, eresult);
} else {
validator_done(val, DNS_R_BROKENCHAIN);
}
}
want_destroy = exit_check(val);
UNLOCK(&val->lock);
if (fetch != NULL) {
dns_resolver_destroyfetch(&fetch);
}
if (want_destroy) {
destroy(val);
}
}
/*%
* We have been asked to look for a DS. This may be part of
* walking a trust chain, or an insecurity proof.
*/
static void
fetch_callback_ds(isc_task_t *task, isc_event_t *event) {
dns_fetchevent_t *devent;
dns_validator_t *val;
dns_rdataset_t *rdataset;
bool want_destroy, trustchain;
isc_result_t result;
isc_result_t eresult;
dns_fetch_t *fetch;
UNUSED(task);
INSIST(event->ev_type == DNS_EVENT_FETCHDONE);
devent = (dns_fetchevent_t *)event;
val = devent->ev_arg;
rdataset = &val->frdataset;
eresult = devent->result;
/*
* Set 'trustchain' to true if we're walking a chain of
* trust; false if we're attempting to prove insecurity.
*/
trustchain = ((val->attributes & VALATTR_INSECURITY) == 0);
/* Free resources which are not of interest. */
if (devent->node != NULL) {
dns_db_detachnode(devent->db, &devent->node);
}
if (devent->db != NULL) {
dns_db_detach(&devent->db);
}
if (dns_rdataset_isassociated(&val->fsigrdataset)) {
dns_rdataset_disassociate(&val->fsigrdataset);
}
INSIST(val->event != NULL);
validator_log(val, ISC_LOG_DEBUG(3), "in fetch_callback_ds");
LOCK(&val->lock);
fetch = val->fetch;
val->fetch = NULL;
if (CANCELED(val)) {
validator_done(val, ISC_R_CANCELED);
goto done;
}
switch (eresult) {
case DNS_R_NXDOMAIN:
case DNS_R_NCACHENXDOMAIN:
/*
* These results only make sense if we're attempting
* an insecurity proof, not when walking a chain of trust.
*/
if (trustchain) {
goto unexpected;
}
FALLTHROUGH;
case ISC_R_SUCCESS:
if (trustchain) {
/*
* We looked for a DS record as part of
* following a key chain upwards; resume following
* the chain.
*/
validator_log(val, ISC_LOG_DEBUG(3),
"dsset with trust %s",
dns_trust_totext(rdataset->trust));
val->dsset = &val->frdataset;
result = validate_dnskey(val);
if (result != DNS_R_WAIT) {
validator_done(val, result);
}
} else {
/*
* There is a DS which may or may not be a zone cut.
* In either case we are still in a secure zone,
* so keep looking for the break in the chain
* of trust.
*/
result = proveunsecure(val, (eresult == ISC_R_SUCCESS),
true);
if (result != DNS_R_WAIT) {
validator_done(val, result);
}
}
break;
case DNS_R_CNAME:
case DNS_R_NXRRSET:
case DNS_R_NCACHENXRRSET:
case DNS_R_SERVFAIL: /* RFC 1034 parent? */
if (trustchain) {
/*
* Failed to find a DS while following the
* chain of trust; now we need to prove insecurity.
*/
validator_log(val, ISC_LOG_DEBUG(3),
"falling back to insecurity proof (%s)",
dns_result_totext(eresult));
result = proveunsecure(val, false, false);
if (result != DNS_R_WAIT) {
validator_done(val, result);
}
} else if (eresult == DNS_R_SERVFAIL) {
goto unexpected;
} else if (eresult != DNS_R_CNAME &&
isdelegation(dns_fixedname_name(&devent->foundname),
&val->frdataset, eresult))
{
/*
* Failed to find a DS while trying to prove
* insecurity. If this is a zone cut, that
* means we're insecure.
*/
result = markanswer(val, "fetch_callback_ds",
"no DS and this is a delegation");
validator_done(val, result);
} else {
/*
* Not a zone cut, so we have to keep looking for
* the break point in the chain of trust.
*/
result = proveunsecure(val, false, true);
if (result != DNS_R_WAIT) {
validator_done(val, result);
}
}
break;
default:
unexpected:
validator_log(val, ISC_LOG_DEBUG(3),
"fetch_callback_ds: got %s",
isc_result_totext(eresult));
if (eresult == ISC_R_CANCELED) {
validator_done(val, eresult);
} else {
validator_done(val, DNS_R_BROKENCHAIN);
}
}
done:
isc_event_free(&event);
want_destroy = exit_check(val);
UNLOCK(&val->lock);
if (fetch != NULL) {
dns_resolver_destroyfetch(&fetch);
}
if (want_destroy) {
destroy(val);
}
}
/*%
* Callback from when a DNSKEY RRset has been validated.
*
* Resumes the stalled validation process.
*/
static void
validator_callback_dnskey(isc_task_t *task, isc_event_t *event) {
dns_validatorevent_t *devent;
dns_validator_t *val;
bool want_destroy;
isc_result_t result;
isc_result_t eresult;
isc_result_t saved_result;
UNUSED(task);
INSIST(event->ev_type == DNS_EVENT_VALIDATORDONE);
devent = (dns_validatorevent_t *)event;
val = devent->ev_arg;
eresult = devent->result;
isc_event_free(&event);
dns_validator_destroy(&val->subvalidator);
INSIST(val->event != NULL);
validator_log(val, ISC_LOG_DEBUG(3), "in validator_callback_dnskey");
LOCK(&val->lock);
if (CANCELED(val)) {
validator_done(val, ISC_R_CANCELED);
} else if (eresult == ISC_R_SUCCESS) {
validator_log(val, ISC_LOG_DEBUG(3), "keyset with trust %s",
dns_trust_totext(val->frdataset.trust));
/*
* Only extract the dst key if the keyset is secure.
*/
if (val->frdataset.trust >= dns_trust_secure) {
(void)select_signing_key(val, &val->frdataset);
}
result = validate_answer(val, true);
if (result == DNS_R_NOVALIDSIG &&
(val->attributes & VALATTR_TRIEDVERIFY) == 0)
{
saved_result = result;
validator_log(val, ISC_LOG_DEBUG(3),
"falling back to insecurity proof");
result = proveunsecure(val, false, false);
if (result == DNS_R_NOTINSECURE) {
result = saved_result;
}
}
if (result != DNS_R_WAIT) {
validator_done(val, result);
}
} else {
if (eresult != DNS_R_BROKENCHAIN) {
expire_rdatasets(val);
}
validator_log(val, ISC_LOG_DEBUG(3),
"validator_callback_dnskey: got %s",
isc_result_totext(eresult));
validator_done(val, DNS_R_BROKENCHAIN);
}
want_destroy = exit_check(val);
UNLOCK(&val->lock);
if (want_destroy) {
destroy(val);
}
}
/*%
* Callback when the DS record has been validated.
*
* Resumes validation of the zone key or the unsecure zone proof.
*/
static void
validator_callback_ds(isc_task_t *task, isc_event_t *event) {
dns_validatorevent_t *devent;
dns_validator_t *val;
bool want_destroy;
isc_result_t result;
isc_result_t eresult;
UNUSED(task);
INSIST(event->ev_type == DNS_EVENT_VALIDATORDONE);
devent = (dns_validatorevent_t *)event;
val = devent->ev_arg;
eresult = devent->result;
isc_event_free(&event);
dns_validator_destroy(&val->subvalidator);
INSIST(val->event != NULL);
validator_log(val, ISC_LOG_DEBUG(3), "in validator_callback_ds");
LOCK(&val->lock);
if (CANCELED(val)) {
validator_done(val, ISC_R_CANCELED);
} else if (eresult == ISC_R_SUCCESS) {
bool have_dsset;
dns_name_t *name;
validator_log(val, ISC_LOG_DEBUG(3), "%s with trust %s",
val->frdataset.type == dns_rdatatype_ds ? "dsset"
: "ds "
"non-"
"existe"
"nce",
dns_trust_totext(val->frdataset.trust));
have_dsset = (val->frdataset.type == dns_rdatatype_ds);
name = dns_fixedname_name(&val->fname);
if ((val->attributes & VALATTR_INSECURITY) != 0 &&
val->frdataset.covers == dns_rdatatype_ds &&
NEGATIVE(&val->frdataset) &&
isdelegation(name, &val->frdataset, DNS_R_NCACHENXRRSET))
{
result = markanswer(val, "validator_callback_ds",
"no DS and this is a delegation");
} else if ((val->attributes & VALATTR_INSECURITY) != 0) {
result = proveunsecure(val, have_dsset, true);
} else {
result = validate_dnskey(val);
}
if (result != DNS_R_WAIT) {
validator_done(val, result);
}
} else {
if (eresult != DNS_R_BROKENCHAIN) {
expire_rdatasets(val);
}
validator_log(val, ISC_LOG_DEBUG(3),
"validator_callback_ds: got %s",
isc_result_totext(eresult));
validator_done(val, DNS_R_BROKENCHAIN);
}
want_destroy = exit_check(val);
UNLOCK(&val->lock);
if (want_destroy) {
destroy(val);
}
}
/*%
* Callback when the CNAME record has been validated.
*
* Resumes validation of the unsecure zone proof.
*/
static void
validator_callback_cname(isc_task_t *task, isc_event_t *event) {
dns_validatorevent_t *devent;
dns_validator_t *val;
bool want_destroy;
isc_result_t result;
isc_result_t eresult;
UNUSED(task);
INSIST(event->ev_type == DNS_EVENT_VALIDATORDONE);
devent = (dns_validatorevent_t *)event;
val = devent->ev_arg;
eresult = devent->result;
isc_event_free(&event);
dns_validator_destroy(&val->subvalidator);
INSIST(val->event != NULL);
INSIST((val->attributes & VALATTR_INSECURITY) != 0);
validator_log(val, ISC_LOG_DEBUG(3), "in validator_callback_cname");
LOCK(&val->lock);
if (CANCELED(val)) {
validator_done(val, ISC_R_CANCELED);
} else if (eresult == ISC_R_SUCCESS) {
validator_log(val, ISC_LOG_DEBUG(3), "cname with trust %s",
dns_trust_totext(val->frdataset.trust));
result = proveunsecure(val, false, true);
if (result != DNS_R_WAIT) {
validator_done(val, result);
}
} else {
if (eresult != DNS_R_BROKENCHAIN) {
expire_rdatasets(val);
}
validator_log(val, ISC_LOG_DEBUG(3),
"validator_callback_cname: got %s",
isc_result_totext(eresult));
validator_done(val, DNS_R_BROKENCHAIN);
}
want_destroy = exit_check(val);
UNLOCK(&val->lock);
if (want_destroy) {
destroy(val);
}
}
/*%
* Callback for when NSEC records have been validated.
*
* Looks for NOQNAME, NODATA and OPTOUT proofs.
*
* Resumes the negative response validation by calling validate_nx().
*/
static void
validator_callback_nsec(isc_task_t *task, isc_event_t *event) {
dns_validatorevent_t *devent;
dns_validator_t *val;
dns_rdataset_t *rdataset;
bool want_destroy;
isc_result_t result;
bool exists, data;
UNUSED(task);
INSIST(event->ev_type == DNS_EVENT_VALIDATORDONE);
devent = (dns_validatorevent_t *)event;
rdataset = devent->rdataset;
val = devent->ev_arg;
result = devent->result;
dns_validator_destroy(&val->subvalidator);
INSIST(val->event != NULL);
validator_log(val, ISC_LOG_DEBUG(3), "in validator_callback_nsec");
LOCK(&val->lock);
if (CANCELED(val)) {
validator_done(val, ISC_R_CANCELED);
} else if (result != ISC_R_SUCCESS) {
validator_log(val, ISC_LOG_DEBUG(3),
"validator_callback_nsec: got %s",
isc_result_totext(result));
if (result == DNS_R_BROKENCHAIN) {
val->authfail++;
}
if (result == ISC_R_CANCELED) {
validator_done(val, result);
} else {
result = validate_nx(val, true);
if (result != DNS_R_WAIT) {
validator_done(val, result);
}
}
} else {
dns_name_t **proofs = val->event->proofs;
dns_name_t *wild = dns_fixedname_name(&val->wild);
if (rdataset->type == dns_rdatatype_nsec &&
rdataset->trust == dns_trust_secure &&
(NEEDNODATA(val) || NEEDNOQNAME(val)) &&
!FOUNDNODATA(val) && !FOUNDNOQNAME(val) &&
dns_nsec_noexistnodata(val->event->type, val->event->name,
devent->name, rdataset, &exists,
&data, wild, validator_log,
val) == ISC_R_SUCCESS)
{
if (exists && !data) {
val->attributes |= VALATTR_FOUNDNODATA;
if (NEEDNODATA(val)) {
proofs[DNS_VALIDATOR_NODATAPROOF] =
devent->name;
}
}
if (!exists) {
dns_name_t *closest;
unsigned int clabels;
val->attributes |= VALATTR_FOUNDNOQNAME;
closest = dns_fixedname_name(&val->closest);
clabels = dns_name_countlabels(closest);
/*
* If we are validating a wildcard response
* clabels will not be zero. We then need
* to check if the generated wildcard from
* dns_nsec_noexistnodata is consistent with
* the wildcard used to generate the response.
*/
if (clabels == 0 ||
dns_name_countlabels(wild) == clabels + 1)
{
val->attributes |= VALATTR_FOUNDCLOSEST;
}
/*
* The NSEC noqname proof also contains
* the closest encloser.
*/
if (NEEDNOQNAME(val)) {
proofs[DNS_VALIDATOR_NOQNAMEPROOF] =
devent->name;
}
}
}
result = validate_nx(val, true);
if (result != DNS_R_WAIT) {
validator_done(val, result);
}
}
want_destroy = exit_check(val);
UNLOCK(&val->lock);
if (want_destroy) {
destroy(val);
}
/*
* Free stuff from the event.
*/
isc_event_free(&event);
}
/*%
* Looks for the requested name and type in the view (zones and cache).
*
* Returns:
* \li ISC_R_SUCCESS
* \li ISC_R_NOTFOUND
* \li DNS_R_NCACHENXDOMAIN
* \li DNS_R_NCACHENXRRSET
* \li DNS_R_NXRRSET
* \li DNS_R_NXDOMAIN
* \li DNS_R_BROKENCHAIN
*/
static isc_result_t
view_find(dns_validator_t *val, dns_name_t *name, dns_rdatatype_t type) {
dns_fixedname_t fixedname;
dns_name_t *foundname;
isc_result_t result;
unsigned int options;
isc_time_t now;
char namebuf[DNS_NAME_FORMATSIZE];
char typebuf[DNS_RDATATYPE_FORMATSIZE];
disassociate_rdatasets(val);
if (isc_time_now(&now) == ISC_R_SUCCESS &&
dns_resolver_getbadcache(val->view->resolver, name, type, &now))
{
dns_name_format(name, namebuf, sizeof(namebuf));
dns_rdatatype_format(type, typebuf, sizeof(typebuf));
validator_log(val, ISC_LOG_INFO, "bad cache hit (%s/%s)",
namebuf, typebuf);
return (DNS_R_BROKENCHAIN);
}
options = DNS_DBFIND_PENDINGOK;
foundname = dns_fixedname_initname(&fixedname);
result = dns_view_find(val->view, name, type, 0, options, false, false,
NULL, NULL, foundname, &val->frdataset,
&val->fsigrdataset);
if (result == DNS_R_NXDOMAIN) {
goto notfound;
} else if (result != ISC_R_SUCCESS && result != DNS_R_NCACHENXDOMAIN &&
result != DNS_R_NCACHENXRRSET && result != DNS_R_EMPTYNAME &&
result != DNS_R_NXRRSET && result != ISC_R_NOTFOUND)
{
result = ISC_R_NOTFOUND;
goto notfound;
}
return (result);
notfound:
disassociate_rdatasets(val);
return (result);
}
/*%
* Checks to make sure we are not going to loop. As we use a SHARED fetch
* the validation process will stall if looping was to occur.
*/
static bool
check_deadlock(dns_validator_t *val, dns_name_t *name, dns_rdatatype_t type,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset) {
dns_validator_t *parent;
for (parent = val; parent != NULL; parent = parent->parent) {
if (parent->event != NULL && parent->event->type == type &&
dns_name_equal(parent->event->name, name) &&
/*
* As NSEC3 records are meta data you sometimes
* need to prove a NSEC3 record which says that
* itself doesn't exist.
*/
(parent->event->type != dns_rdatatype_nsec3 ||
rdataset == NULL || sigrdataset == NULL ||
parent->event->message == NULL ||
parent->event->rdataset != NULL ||
parent->event->sigrdataset != NULL))
{
validator_log(val, ISC_LOG_DEBUG(3),
"continuing validation would lead to "
"deadlock: aborting validation");
return (true);
}
}
return (false);
}
/*%
* Start a fetch for the requested name and type.
*/
static isc_result_t
create_fetch(dns_validator_t *val, dns_name_t *name, dns_rdatatype_t type,
isc_taskaction_t callback, const char *caller) {
unsigned int fopts = 0;
disassociate_rdatasets(val);
if (check_deadlock(val, name, type, NULL, NULL)) {
validator_log(val, ISC_LOG_DEBUG(3),
"deadlock found (create_fetch)");
return (DNS_R_NOVALIDSIG);
}
if ((val->options & DNS_VALIDATOR_NOCDFLAG) != 0) {
fopts |= DNS_FETCHOPT_NOCDFLAG;
}
if ((val->options & DNS_VALIDATOR_NONTA) != 0) {
fopts |= DNS_FETCHOPT_NONTA;
}
validator_logcreate(val, name, type, caller, "fetch");
return (dns_resolver_createfetch(
val->view->resolver, name, type, NULL, NULL, NULL, NULL, 0,
fopts, 0, NULL, val->event->ev_sender, callback, val,
&val->frdataset, &val->fsigrdataset, &val->fetch));
}
/*%
* Start a subvalidation process.
*/
static isc_result_t
create_validator(dns_validator_t *val, dns_name_t *name, dns_rdatatype_t type,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset,
isc_taskaction_t action, const char *caller) {
isc_result_t result;
unsigned int vopts = 0;
dns_rdataset_t *sig = NULL;
if (sigrdataset != NULL && dns_rdataset_isassociated(sigrdataset)) {
sig = sigrdataset;
}
if (check_deadlock(val, name, type, rdataset, sig)) {
validator_log(val, ISC_LOG_DEBUG(3),
"deadlock found (create_validator)");
return (DNS_R_NOVALIDSIG);
}
/* OK to clear other options, but preserve NOCDFLAG and NONTA. */
vopts |= (val->options &
(DNS_VALIDATOR_NOCDFLAG | DNS_VALIDATOR_NONTA));
validator_logcreate(val, name, type, caller, "validator");
result = dns_validator_create(val->view, name, type, rdataset, sig,
NULL, vopts, val->task, action, val,
&val->subvalidator);
if (result == ISC_R_SUCCESS) {
val->subvalidator->parent = val;
val->subvalidator->depth = val->depth + 1;
}
return (result);
}
/*%
* Try to find a key that could have signed val->siginfo among those in
* 'rdataset'. If found, build a dst_key_t for it and point val->key at
* it.
*
* If val->key is already non-NULL, locate it in the rdataset and then
* search past it for the *next* key that could have signed 'siginfo', then
* set val->key to that.
*
* Returns ISC_R_SUCCESS if a possible matching key has been found,
* ISC_R_NOTFOUND if not. Any other value indicates error.
*/
static isc_result_t
select_signing_key(dns_validator_t *val, dns_rdataset_t *rdataset) {
isc_result_t result;
dns_rdata_rrsig_t *siginfo = val->siginfo;
isc_buffer_t b;
dns_rdata_t rdata = DNS_RDATA_INIT;
dst_key_t *oldkey = val->key;
bool foundold;
if (oldkey == NULL) {
foundold = true;
} else {
foundold = false;
val->key = NULL;
}
result = dns_rdataset_first(rdataset);
if (result != ISC_R_SUCCESS) {
goto failure;
}
do {
dns_rdataset_current(rdataset, &rdata);
isc_buffer_init(&b, rdata.data, rdata.length);
isc_buffer_add(&b, rdata.length);
INSIST(val->key == NULL);
result = dst_key_fromdns(&siginfo->signer, rdata.rdclass, &b,
val->view->mctx, &val->key);
if (result == ISC_R_SUCCESS) {
if (siginfo->algorithm ==
(dns_secalg_t)dst_key_alg(val->key) &&
siginfo->keyid ==
(dns_keytag_t)dst_key_id(val->key) &&
dst_key_iszonekey(val->key))
{
if (foundold) {
/*
* This is the key we're looking for.
*/
return (ISC_R_SUCCESS);
} else if (dst_key_compare(oldkey, val->key)) {
foundold = true;
dst_key_free(&oldkey);
}
}
dst_key_free(&val->key);
}
dns_rdata_reset(&rdata);
result = dns_rdataset_next(rdataset);
} while (result == ISC_R_SUCCESS);
if (result == ISC_R_NOMORE) {
result = ISC_R_NOTFOUND;
}
failure:
if (oldkey != NULL) {
dst_key_free(&oldkey);
}
return (result);
}
/*%
* Get the key that generated the signature in val->siginfo.
*/
static isc_result_t
seek_dnskey(dns_validator_t *val) {
isc_result_t result;
dns_rdata_rrsig_t *siginfo = val->siginfo;
unsigned int nlabels;
int order;
dns_namereln_t namereln;
/*
* Is the signer name appropriate for this signature?
*
* The signer name must be at the same level as the owner name
* or closer to the DNS root.
*/
namereln = dns_name_fullcompare(val->event->name, &siginfo->signer,
&order, &nlabels);
if (namereln != dns_namereln_subdomain &&
namereln != dns_namereln_equal)
{
return (DNS_R_CONTINUE);
}
if (namereln == dns_namereln_equal) {
/*
* If this is a self-signed keyset, it must not be a zone key
* (since seek_dnskey is not called from validate_dnskey).
*/
if (val->event->rdataset->type == dns_rdatatype_dnskey) {
return (DNS_R_CONTINUE);
}
/*
* Records appearing in the parent zone at delegation
* points cannot be self-signed.
*/
if (dns_rdatatype_atparent(val->event->rdataset->type)) {
return (DNS_R_CONTINUE);
}
} else {
/*
* SOA and NS RRsets can only be signed by a key with
* the same name.
*/
if (val->event->rdataset->type == dns_rdatatype_soa ||
val->event->rdataset->type == dns_rdatatype_ns)
{
const char *type;
if (val->event->rdataset->type == dns_rdatatype_soa) {
type = "SOA";
} else {
type = "NS";
}
validator_log(val, ISC_LOG_DEBUG(3),
"%s signer mismatch", type);
return (DNS_R_CONTINUE);
}
}
/*
* Do we know about this key?
*/
result = view_find(val, &siginfo->signer, dns_rdatatype_dnskey);
switch (result) {
case ISC_R_SUCCESS:
/*
* We have an rrset for the given keyname.
*/
val->keyset = &val->frdataset;
if ((DNS_TRUST_PENDING(val->frdataset.trust) ||
DNS_TRUST_ANSWER(val->frdataset.trust)) &&
dns_rdataset_isassociated(&val->fsigrdataset))
{
/*
* We know the key but haven't validated it yet or
* we have a key of trust answer but a DS
* record for the zone may have been added.
*/
result = create_validator(
val, &siginfo->signer, dns_rdatatype_dnskey,
&val->frdataset, &val->fsigrdataset,
validator_callback_dnskey, "seek_dnskey");
if (result != ISC_R_SUCCESS) {
return (result);
}
return (DNS_R_WAIT);
} else if (DNS_TRUST_PENDING(val->frdataset.trust)) {
/*
* Having a pending key with no signature means that
* something is broken.
*/
result = DNS_R_CONTINUE;
} else if (val->frdataset.trust < dns_trust_secure) {
/*
* The key is legitimately insecure. There's no
* point in even attempting verification.
*/
val->key = NULL;
result = ISC_R_SUCCESS;
} else {
/*
* See if we've got the key used in the signature.
*/
validator_log(val, ISC_LOG_DEBUG(3),
"keyset with trust %s",
dns_trust_totext(val->frdataset.trust));
result = select_signing_key(val, val->keyset);
if (result != ISC_R_SUCCESS) {
/*
* Either the key we're looking for is not
* in the rrset, or something bad happened.
* Give up.
*/
result = DNS_R_CONTINUE;
}
}
break;
case ISC_R_NOTFOUND:
/*
* We don't know anything about this key.
*/
result = create_fetch(val, &siginfo->signer,
dns_rdatatype_dnskey,
fetch_callback_dnskey, "seek_dnskey");
if (result != ISC_R_SUCCESS) {
return (result);
}
return (DNS_R_WAIT);
case DNS_R_NCACHENXDOMAIN:
case DNS_R_NCACHENXRRSET:
case DNS_R_EMPTYNAME:
case DNS_R_NXDOMAIN:
case DNS_R_NXRRSET:
/*
* This key doesn't exist.
*/
result = DNS_R_CONTINUE;
break;
case DNS_R_BROKENCHAIN:
return (result);
default:
break;
}
if (dns_rdataset_isassociated(&val->frdataset) &&
val->keyset != &val->frdataset)
{
dns_rdataset_disassociate(&val->frdataset);
}
if (dns_rdataset_isassociated(&val->fsigrdataset)) {
dns_rdataset_disassociate(&val->fsigrdataset);
}
return (result);
}
/*
* Compute the tag for a key represented in a DNSKEY rdata.
*/
static dns_keytag_t
compute_keytag(dns_rdata_t *rdata) {
isc_region_t r;
dns_rdata_toregion(rdata, &r);
return (dst_region_computeid(&r));
}
/*%
* Is the DNSKEY rrset in val->event->rdataset self-signed?
*/
static bool
selfsigned_dnskey(dns_validator_t *val) {
dns_rdataset_t *rdataset = val->event->rdataset;
dns_rdataset_t *sigrdataset = val->event->sigrdataset;
dns_name_t *name = val->event->name;
isc_result_t result;
isc_mem_t *mctx = val->view->mctx;
bool answer = false;
if (rdataset->type != dns_rdatatype_dnskey) {
return (false);
}
for (result = dns_rdataset_first(rdataset); result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset))
{
dns_rdata_t keyrdata = DNS_RDATA_INIT;
dns_rdata_t sigrdata = DNS_RDATA_INIT;
dns_rdata_dnskey_t key;
dns_rdata_rrsig_t sig;
dns_keytag_t keytag;
dns_rdata_reset(&keyrdata);
dns_rdataset_current(rdataset, &keyrdata);
result = dns_rdata_tostruct(&keyrdata, &key, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
keytag = compute_keytag(&keyrdata);
for (result = dns_rdataset_first(sigrdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(sigrdataset))
{
dst_key_t *dstkey = NULL;
dns_rdata_reset(&sigrdata);
dns_rdataset_current(sigrdataset, &sigrdata);
result = dns_rdata_tostruct(&sigrdata, &sig, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
if (sig.algorithm != key.algorithm ||
sig.keyid != keytag ||
!dns_name_equal(name, &sig.signer))
{
continue;
}
/*
* If the REVOKE bit is not set we have a
* theoretically self signed DNSKEY RRset.
* This will be verified later.
*/
if ((key.flags & DNS_KEYFLAG_REVOKE) == 0) {
answer = true;
continue;
}
result = dns_dnssec_keyfromrdata(name, &keyrdata, mctx,
&dstkey);
if (result != ISC_R_SUCCESS) {
continue;
}
/*
* If this RRset is pending and it is trusted,
* see if it was self signed by this DNSKEY.
*/
if (DNS_TRUST_PENDING(rdataset->trust) &&
dns_view_istrusted(val->view, name, &key))
{
result = dns_dnssec_verify(
name, rdataset, dstkey, true,
val->view->maxbits, mctx, &sigrdata,
NULL);
if (result == ISC_R_SUCCESS) {
/*
* The key with the REVOKE flag has
* self signed the RRset so it is no
* good.
*/
dns_view_untrust(val->view, name, &key);
}
} else if (rdataset->trust >= dns_trust_secure) {
/*
* We trust this RRset so if the key is
* marked revoked remove it.
*/
dns_view_untrust(val->view, name, &key);
}
dst_key_free(&dstkey);
}
}
return (answer);
}
/*%
* Attempt to verify the rdataset using the given key and rdata (RRSIG).
* The signature was good and from a wildcard record and the QNAME does
* not match the wildcard we need to look for a NOQNAME proof.
*
* Returns:
* \li ISC_R_SUCCESS if the verification succeeds.
* \li Others if the verification fails.
*/
static isc_result_t
verify(dns_validator_t *val, dst_key_t *key, dns_rdata_t *rdata,
uint16_t keyid) {
isc_result_t result;
dns_fixedname_t fixed;
bool ignore = false;
dns_name_t *wild;
val->attributes |= VALATTR_TRIEDVERIFY;
wild = dns_fixedname_initname(&fixed);
again:
result = dns_dnssec_verify(val->event->name, val->event->rdataset, key,
ignore, val->view->maxbits, val->view->mctx,
rdata, wild);
if ((result == DNS_R_SIGEXPIRED || result == DNS_R_SIGFUTURE) &&
val->view->acceptexpired)
{
ignore = true;
goto again;
}
if (ignore && (result == ISC_R_SUCCESS || result == DNS_R_FROMWILDCARD))
{
validator_log(val, ISC_LOG_INFO,
"accepted expired %sRRSIG (keyid=%u)",
(result == DNS_R_FROMWILDCARD) ? "wildcard " : "",
keyid);
} else if (result == DNS_R_SIGEXPIRED || result == DNS_R_SIGFUTURE) {
validator_log(val, ISC_LOG_INFO,
"verify failed due to bad signature (keyid=%u): "
"%s",
keyid, isc_result_totext(result));
} else {
validator_log(val, ISC_LOG_DEBUG(3),
"verify rdataset (keyid=%u): %s", keyid,
isc_result_totext(result));
}
if (result == DNS_R_FROMWILDCARD) {
if (!dns_name_equal(val->event->name, wild)) {
dns_name_t *closest;
unsigned int labels;
/*
* Compute the closest encloser in case we need it
* for the NSEC3 NOQNAME proof.
*/
closest = dns_fixedname_name(&val->closest);
dns_name_copynf(wild, closest);
labels = dns_name_countlabels(closest) - 1;
dns_name_getlabelsequence(closest, 1, labels, closest);
val->attributes |= VALATTR_NEEDNOQNAME;
}
result = ISC_R_SUCCESS;
}
return (result);
}
/*%
* Attempts positive response validation of a normal RRset.
*
* Returns:
* \li ISC_R_SUCCESS Validation completed successfully
* \li DNS_R_WAIT Validation has started but is waiting
* for an event.
* \li Other return codes are possible and all indicate failure.
*/
static isc_result_t
validate_answer(dns_validator_t *val, bool resume) {
isc_result_t result, vresult = DNS_R_NOVALIDSIG;
dns_validatorevent_t *event;
dns_rdata_t rdata = DNS_RDATA_INIT;
/*
* Caller must be holding the validator lock.
*/
event = val->event;
if (resume) {
/*
* We already have a sigrdataset.
*/
result = ISC_R_SUCCESS;
validator_log(val, ISC_LOG_DEBUG(3), "resuming validate");
} else {
result = dns_rdataset_first(event->sigrdataset);
}
for (; result == ISC_R_SUCCESS;
result = dns_rdataset_next(event->sigrdataset))
{
dns_rdata_reset(&rdata);
dns_rdataset_current(event->sigrdataset, &rdata);
if (val->siginfo == NULL) {
val->siginfo = isc_mem_get(val->view->mctx,
sizeof(*val->siginfo));
}
result = dns_rdata_tostruct(&rdata, val->siginfo, NULL);
if (result != ISC_R_SUCCESS) {
return (result);
}
/*
* At this point we could check that the signature algorithm
* was known and "sufficiently good".
*/
if (!dns_resolver_algorithm_supported(val->view->resolver,
event->name,
val->siginfo->algorithm))
{
resume = false;
continue;
}
if (!resume) {
result = seek_dnskey(val);
if (result == DNS_R_CONTINUE) {
continue; /* Try the next SIG RR. */
}
if (result != ISC_R_SUCCESS) {
return (result);
}
}
/*
* There isn't a secure DNSKEY for this signature so move
* onto the next RRSIG.
*/
if (val->key == NULL) {
resume = false;
continue;
}
do {
isc_result_t tresult;
vresult = verify(val, val->key, &rdata,
val->siginfo->keyid);
if (vresult == ISC_R_SUCCESS) {
break;
}
tresult = select_signing_key(val, val->keyset);
if (tresult != ISC_R_SUCCESS) {
break;
}
} while (1);
if (vresult != ISC_R_SUCCESS) {
validator_log(val, ISC_LOG_DEBUG(3),
"failed to verify rdataset");
} else {
dns_rdataset_trimttl(event->rdataset,
event->sigrdataset, val->siginfo,
val->start,
val->view->acceptexpired);
}
if (val->key != NULL) {
dst_key_free(&val->key);
}
if (val->keyset != NULL) {
dns_rdataset_disassociate(val->keyset);
val->keyset = NULL;
}
val->key = NULL;
if (NEEDNOQNAME(val)) {
if (val->event->message == NULL) {
validator_log(val, ISC_LOG_DEBUG(3),
"no message available "
"for noqname proof");
return (DNS_R_NOVALIDSIG);
}
validator_log(val, ISC_LOG_DEBUG(3),
"looking for noqname proof");
return (validate_nx(val, false));
} else if (vresult == ISC_R_SUCCESS) {
marksecure(event);
validator_log(val, ISC_LOG_DEBUG(3),
"marking as secure, "
"noqname proof not needed");
return (ISC_R_SUCCESS);
} else {
validator_log(val, ISC_LOG_DEBUG(3),
"verify failure: %s",
isc_result_totext(result));
resume = false;
}
}
if (result != ISC_R_NOMORE) {
validator_log(val, ISC_LOG_DEBUG(3),
"failed to iterate signatures: %s",
isc_result_totext(result));
return (result);
}
validator_log(val, ISC_LOG_INFO, "no valid signature found");
return (vresult);
}
/*%
* Check whether this DNSKEY (keyrdata) signed the DNSKEY RRset
* (val->event->rdataset).
*/
static isc_result_t
check_signer(dns_validator_t *val, dns_rdata_t *keyrdata, uint16_t keyid,
dns_secalg_t algorithm) {
dns_rdata_rrsig_t sig;
dst_key_t *dstkey = NULL;
isc_result_t result;
for (result = dns_rdataset_first(val->event->sigrdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(val->event->sigrdataset))
{
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdataset_current(val->event->sigrdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &sig, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
if (keyid != sig.keyid || algorithm != sig.algorithm) {
continue;
}
if (dstkey == NULL) {
result = dns_dnssec_keyfromrdata(
val->event->name, keyrdata, val->view->mctx,
&dstkey);
if (result != ISC_R_SUCCESS) {
/*
* This really shouldn't happen, but...
*/
continue;
}
}
result = verify(val, dstkey, &rdata, sig.keyid);
if (result == ISC_R_SUCCESS) {
break;
}
}
if (dstkey != NULL) {
dst_key_free(&dstkey);
}
return (result);
}
/*
* get_dsset() is called to look up a DS RRset corresponding to the name
* of a DNSKEY record, either in the cache or, if necessary, by starting a
* fetch. This is done in the context of validating a zone key to build a
* trust chain.
*
* Returns:
* \li ISC_R_COMPLETE a DS has not been found; the caller should
* stop trying to validate the zone key and
* return the result code in '*resp'.
* \li DNS_R_CONTINUE a DS has been found and the caller may
* continue the zone key validation.
*/
static isc_result_t
get_dsset(dns_validator_t *val, dns_name_t *tname, isc_result_t *resp) {
isc_result_t result;
result = view_find(val, tname, dns_rdatatype_ds);
switch (result) {
case ISC_R_SUCCESS:
/*
* We have a DS RRset.
*/
val->dsset = &val->frdataset;
if ((DNS_TRUST_PENDING(val->frdataset.trust) ||
DNS_TRUST_ANSWER(val->frdataset.trust)) &&
dns_rdataset_isassociated(&val->fsigrdataset))
{
/*
* ... which is signed but not yet validated.
*/
result = create_validator(
val, tname, dns_rdatatype_ds, &val->frdataset,
&val->fsigrdataset, validator_callback_ds,
"validate_dnskey");
*resp = DNS_R_WAIT;
if (result != ISC_R_SUCCESS) {
*resp = result;
}
return (ISC_R_COMPLETE);
} else if (DNS_TRUST_PENDING(val->frdataset.trust)) {
/*
* There should never be an unsigned DS.
*/
disassociate_rdatasets(val);
validator_log(val, ISC_LOG_DEBUG(2),
"unsigned DS record");
*resp = DNS_R_NOVALIDSIG;
return (ISC_R_COMPLETE);
}
break;
case ISC_R_NOTFOUND:
/*
* We don't have the DS. Find it.
*/
result = create_fetch(val, tname, dns_rdatatype_ds,
fetch_callback_ds, "validate_dnskey");
*resp = DNS_R_WAIT;
if (result != ISC_R_SUCCESS) {
*resp = result;
}
return (ISC_R_COMPLETE);
case DNS_R_NCACHENXDOMAIN:
case DNS_R_NCACHENXRRSET:
case DNS_R_EMPTYNAME:
case DNS_R_NXDOMAIN:
case DNS_R_NXRRSET:
case DNS_R_CNAME:
/*
* The DS does not exist.
*/
disassociate_rdatasets(val);
validator_log(val, ISC_LOG_DEBUG(2), "no DS record");
*resp = DNS_R_NOVALIDSIG;
return (ISC_R_COMPLETE);
case DNS_R_BROKENCHAIN:
*resp = result;
return (ISC_R_COMPLETE);
default:
break;
}
return (DNS_R_CONTINUE);
}
/*%
* Attempts positive response validation of an RRset containing zone keys
* (i.e. a DNSKEY rrset).
*
* Caller must be holding the validator lock.
*
* Returns:
* \li ISC_R_SUCCESS Validation completed successfully
* \li DNS_R_WAIT Validation has started but is waiting
* for an event.
* \li Other return codes are possible and all indicate failure.
*/
static isc_result_t
validate_dnskey(dns_validator_t *val) {
isc_result_t result;
dns_rdata_t dsrdata = DNS_RDATA_INIT;
dns_rdata_t keyrdata = DNS_RDATA_INIT;
dns_keynode_t *keynode = NULL;
dns_rdata_ds_t ds;
bool supported_algorithm;
char digest_types[256];
/*
* If we don't already have a DS RRset, check to see if there's
* a DS style trust anchor configured for this key.
*/
if (val->dsset == NULL) {
result = dns_keytable_find(val->keytable, val->event->name,
&keynode);
if (result == ISC_R_SUCCESS) {
if (dns_keynode_dsset(keynode, &val->fdsset)) {
val->dsset = &val->fdsset;
}
dns_keytable_detachkeynode(val->keytable, &keynode);
}
}
/*
* No trust anchor for this name, so we look up the DS at the parent.
*/
if (val->dsset == NULL) {
isc_result_t tresult = ISC_R_SUCCESS;
/*
* If this is the root name and there was no trust anchor,
* we can give up now, since there's no DS at the root.
*/
if (dns_name_equal(val->event->name, dns_rootname)) {
if ((val->attributes & VALATTR_TRIEDVERIFY) != 0) {
validator_log(val, ISC_LOG_DEBUG(3),
"root key failed to validate");
} else {
validator_log(val, ISC_LOG_DEBUG(3),
"no trusted root key");
}
result = DNS_R_NOVALIDSIG;
goto cleanup;
}
/*
* Look up the DS RRset for this name.
*/
result = get_dsset(val, val->event->name, &tresult);
if (result == ISC_R_COMPLETE) {
result = tresult;
goto cleanup;
}
}
/*
* We have a DS set.
*/
INSIST(val->dsset != NULL);
if (val->dsset->trust < dns_trust_secure) {
result = markanswer(val, "validate_dnskey (2)", "insecure DS");
goto cleanup;
}
/*
* Look through the DS record and find the keys that can sign the
* key set and the matching signature. For each such key, attempt
* verification.
*/
supported_algorithm = false;
/*
* If DNS_DSDIGEST_SHA256 or DNS_DSDIGEST_SHA384 is present we
* are required to prefer it over DNS_DSDIGEST_SHA1. This in
* practice means that we need to ignore DNS_DSDIGEST_SHA1 if a
* DNS_DSDIGEST_SHA256 or DNS_DSDIGEST_SHA384 is present.
*/
memset(digest_types, 1, sizeof(digest_types));
for (result = dns_rdataset_first(val->dsset); result == ISC_R_SUCCESS;
result = dns_rdataset_next(val->dsset))
{
dns_rdata_reset(&dsrdata);
dns_rdataset_current(val->dsset, &dsrdata);
result = dns_rdata_tostruct(&dsrdata, &ds, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
if (!dns_resolver_ds_digest_supported(val->view->resolver,
val->event->name,
ds.digest_type))
{
continue;
}
if (!dns_resolver_algorithm_supported(val->view->resolver,
val->event->name,
ds.algorithm))
{
continue;
}
if ((ds.digest_type == DNS_DSDIGEST_SHA256 &&
ds.length == ISC_SHA256_DIGESTLENGTH) ||
(ds.digest_type == DNS_DSDIGEST_SHA384 &&
ds.length == ISC_SHA384_DIGESTLENGTH))
{
digest_types[DNS_DSDIGEST_SHA1] = 0;
break;
}
}
for (result = dns_rdataset_first(val->dsset); result == ISC_R_SUCCESS;
result = dns_rdataset_next(val->dsset))
{
dns_rdata_reset(&dsrdata);
dns_rdataset_current(val->dsset, &dsrdata);
result = dns_rdata_tostruct(&dsrdata, &ds, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
if (digest_types[ds.digest_type] == 0) {
continue;
}
if (!dns_resolver_ds_digest_supported(val->view->resolver,
val->event->name,
ds.digest_type))
{
continue;
}
if (!dns_resolver_algorithm_supported(val->view->resolver,
val->event->name,
ds.algorithm))
{
continue;
}
supported_algorithm = true;
/*
* Find the DNSKEY matching the DS...
*/
result = dns_dnssec_matchdskey(val->event->name, &dsrdata,
val->event->rdataset, &keyrdata);
if (result != ISC_R_SUCCESS) {
validator_log(val, ISC_LOG_DEBUG(3),
"no DNSKEY matching DS");
continue;
}
/*
* ... and check that it signed the DNSKEY RRset.
*/
result = check_signer(val, &keyrdata, ds.key_tag, ds.algorithm);
if (result == ISC_R_SUCCESS) {
break;
}
validator_log(val, ISC_LOG_DEBUG(3),
"no RRSIG matching DS key");
}
if (result == ISC_R_SUCCESS) {
marksecure(val->event);
validator_log(val, ISC_LOG_DEBUG(3), "marking as secure (DS)");
} else if (result == ISC_R_NOMORE && !supported_algorithm) {
validator_log(val, ISC_LOG_DEBUG(3),
"no supported algorithm/digest (DS)");
result = markanswer(val, "validate_dnskey (3)",
"no supported algorithm/digest (DS)");
} else {
validator_log(val, ISC_LOG_INFO,
"no valid signature found (DS)");
result = DNS_R_NOVALIDSIG;
}
cleanup:
if (val->dsset == &val->fdsset) {
val->dsset = NULL;
dns_rdataset_disassociate(&val->fdsset);
}
return (result);
}
/*%
* val_rdataset_first and val_rdataset_next provide iteration methods
* that hide whether we are iterating across the AUTHORITY section of
* a message, or a negative cache rdataset.
*/
static isc_result_t
val_rdataset_first(dns_validator_t *val, dns_name_t **namep,
dns_rdataset_t **rdatasetp) {
dns_message_t *message = val->event->message;
isc_result_t result;
REQUIRE(rdatasetp != NULL);
REQUIRE(namep != NULL);
if (message == NULL) {
REQUIRE(*rdatasetp != NULL);
REQUIRE(*namep != NULL);
} else {
REQUIRE(*rdatasetp == NULL);
REQUIRE(*namep == NULL);
}
if (message != NULL) {
result = dns_message_firstname(message, DNS_SECTION_AUTHORITY);
if (result != ISC_R_SUCCESS) {
return (result);
}
dns_message_currentname(message, DNS_SECTION_AUTHORITY, namep);
*rdatasetp = ISC_LIST_HEAD((*namep)->list);
INSIST(*rdatasetp != NULL);
} else {
result = dns_rdataset_first(val->event->rdataset);
if (result == ISC_R_SUCCESS) {
dns_ncache_current(val->event->rdataset, *namep,
*rdatasetp);
}
}
return (result);
}
static isc_result_t
val_rdataset_next(dns_validator_t *val, dns_name_t **namep,
dns_rdataset_t **rdatasetp) {
dns_message_t *message = val->event->message;
isc_result_t result = ISC_R_SUCCESS;
REQUIRE(rdatasetp != NULL && *rdatasetp != NULL);
REQUIRE(namep != NULL && *namep != NULL);
if (message != NULL) {
dns_rdataset_t *rdataset = *rdatasetp;
rdataset = ISC_LIST_NEXT(rdataset, link);
if (rdataset == NULL) {
*namep = NULL;
result = dns_message_nextname(message,
DNS_SECTION_AUTHORITY);
if (result == ISC_R_SUCCESS) {
dns_message_currentname(
message, DNS_SECTION_AUTHORITY, namep);
rdataset = ISC_LIST_HEAD((*namep)->list);
INSIST(rdataset != NULL);
}
}
*rdatasetp = rdataset;
} else {
dns_rdataset_disassociate(*rdatasetp);
result = dns_rdataset_next(val->event->rdataset);
if (result == ISC_R_SUCCESS) {
dns_ncache_current(val->event->rdataset, *namep,
*rdatasetp);
}
}
return (result);
}
/*%
* Look for NODATA at the wildcard and NOWILDCARD proofs in the
* previously validated NSEC records. As these proofs are mutually
* exclusive we stop when one is found.
*
* Returns
* \li ISC_R_SUCCESS
*/
static isc_result_t
checkwildcard(dns_validator_t *val, dns_rdatatype_t type,
dns_name_t *zonename) {
dns_name_t *name, *wild, tname;
isc_result_t result;
bool exists, data;
char namebuf[DNS_NAME_FORMATSIZE];
dns_rdataset_t *rdataset, trdataset;
dns_name_init(&tname, NULL);
dns_rdataset_init(&trdataset);
wild = dns_fixedname_name(&val->wild);
if (dns_name_countlabels(wild) == 0) {
validator_log(val, ISC_LOG_DEBUG(3),
"in checkwildcard: no wildcard to check");
return (ISC_R_SUCCESS);
}
dns_name_format(wild, namebuf, sizeof(namebuf));
validator_log(val, ISC_LOG_DEBUG(3), "in checkwildcard: %s", namebuf);
if (val->event->message == NULL) {
name = &tname;
rdataset = &trdataset;
} else {
name = NULL;
rdataset = NULL;
}
for (result = val_rdataset_first(val, &name, &rdataset);
result == ISC_R_SUCCESS;
result = val_rdataset_next(val, &name, &rdataset))
{
if (rdataset->type != type ||
rdataset->trust != dns_trust_secure)
{
continue;
}
if (rdataset->type == dns_rdatatype_nsec &&
(NEEDNODATA(val) || NEEDNOWILDCARD(val)) &&
!FOUNDNODATA(val) && !FOUNDNOWILDCARD(val) &&
dns_nsec_noexistnodata(val->event->type, wild, name,
rdataset, &exists, &data, NULL,
validator_log, val) == ISC_R_SUCCESS)
{
dns_name_t **proofs = val->event->proofs;
if (exists && !data) {
val->attributes |= VALATTR_FOUNDNODATA;
}
if (exists && !data && NEEDNODATA(val)) {
proofs[DNS_VALIDATOR_NODATAPROOF] = name;
}
if (!exists) {
val->attributes |= VALATTR_FOUNDNOWILDCARD;
}
if (!exists && NEEDNOQNAME(val)) {
proofs[DNS_VALIDATOR_NOWILDCARDPROOF] = name;
}
if (dns_rdataset_isassociated(&trdataset)) {
dns_rdataset_disassociate(&trdataset);
}
return (ISC_R_SUCCESS);
}
if (rdataset->type == dns_rdatatype_nsec3 &&
(NEEDNODATA(val) || NEEDNOWILDCARD(val)) &&
!FOUNDNODATA(val) && !FOUNDNOWILDCARD(val) &&
dns_nsec3_noexistnodata(
val->event->type, wild, name, rdataset, zonename,
&exists, &data, NULL, NULL, NULL, NULL, NULL, NULL,
validator_log, val) == ISC_R_SUCCESS)
{
dns_name_t **proofs = val->event->proofs;
if (exists && !data) {
val->attributes |= VALATTR_FOUNDNODATA;
}
if (exists && !data && NEEDNODATA(val)) {
proofs[DNS_VALIDATOR_NODATAPROOF] = name;
}
if (!exists) {
val->attributes |= VALATTR_FOUNDNOWILDCARD;
}
if (!exists && NEEDNOQNAME(val)) {
proofs[DNS_VALIDATOR_NOWILDCARDPROOF] = name;
}
if (dns_rdataset_isassociated(&trdataset)) {
dns_rdataset_disassociate(&trdataset);
}
return (ISC_R_SUCCESS);
}
}
if (result == ISC_R_NOMORE) {
result = ISC_R_SUCCESS;
}
if (dns_rdataset_isassociated(&trdataset)) {
dns_rdataset_disassociate(&trdataset);
}
return (result);
}
/*
* Look for the needed proofs for a negative or wildcard response
* from a zone using NSEC3, and set flags in the validator as they
* are found.
*/
static isc_result_t
findnsec3proofs(dns_validator_t *val) {
dns_name_t *name, tname;
isc_result_t result;
bool exists, data, optout, unknown;
bool setclosest, setnearest, *setclosestp;
dns_fixedname_t fclosest, fnearest, fzonename;
dns_name_t *closest, *nearest, *zonename, *closestp;
dns_name_t **proofs = val->event->proofs;
dns_rdataset_t *rdataset, trdataset;
dns_name_init(&tname, NULL);
dns_rdataset_init(&trdataset);
closest = dns_fixedname_initname(&fclosest);
nearest = dns_fixedname_initname(&fnearest);
zonename = dns_fixedname_initname(&fzonename);
if (val->event->message == NULL) {
name = &tname;
rdataset = &trdataset;
} else {
name = NULL;
rdataset = NULL;
}
for (result = val_rdataset_first(val, &name, &rdataset);
result == ISC_R_SUCCESS;
result = val_rdataset_next(val, &name, &rdataset))
{
if (rdataset->type != dns_rdatatype_nsec3 ||
rdataset->trust != dns_trust_secure)
{
continue;
}
result = dns_nsec3_noexistnodata(
val->event->type, val->event->name, name, rdataset,
zonename, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, validator_log, val);
if (result != ISC_R_IGNORE && result != ISC_R_SUCCESS) {
if (dns_rdataset_isassociated(&trdataset)) {
dns_rdataset_disassociate(&trdataset);
}
return (result);
}
}
if (result != ISC_R_NOMORE) {
result = ISC_R_SUCCESS;
}
POST(result);
if (dns_name_countlabels(zonename) == 0) {
return (ISC_R_SUCCESS);
}
/*
* If the val->closest is set then we want to use it otherwise
* we need to discover it.
*/
if (dns_name_countlabels(dns_fixedname_name(&val->closest)) != 0) {
char namebuf[DNS_NAME_FORMATSIZE];
dns_name_format(dns_fixedname_name(&val->closest), namebuf,
sizeof(namebuf));
validator_log(val, ISC_LOG_DEBUG(3),
"closest encloser from wildcard signature '%s'",
namebuf);
dns_name_copynf(dns_fixedname_name(&val->closest), closest);
closestp = NULL;
setclosestp = NULL;
} else {
closestp = closest;
setclosestp = &setclosest;
}
for (result = val_rdataset_first(val, &name, &rdataset);
result == ISC_R_SUCCESS;
result = val_rdataset_next(val, &name, &rdataset))
{
if (rdataset->type != dns_rdatatype_nsec3 ||
rdataset->trust != dns_trust_secure)
{
continue;
}
/*
* We process all NSEC3 records to find the closest
* encloser and nearest name to the closest encloser.
*/
setclosest = setnearest = false;
optout = false;
unknown = false;
result = dns_nsec3_noexistnodata(
val->event->type, val->event->name, name, rdataset,
zonename, &exists, &data, &optout, &unknown,
setclosestp, &setnearest, closestp, nearest,
validator_log, val);
if (unknown) {
val->attributes |= VALATTR_FOUNDUNKNOWN;
}
if (result == DNS_R_NSEC3ITERRANGE) {
/*
* We don't really know which NSEC3 record provides
* which proof. Just populate them.
*/
if (NEEDNOQNAME(val) &&
proofs[DNS_VALIDATOR_NOQNAMEPROOF] == NULL)
{
proofs[DNS_VALIDATOR_NOQNAMEPROOF] = name;
} else if (setclosest) {
proofs[DNS_VALIDATOR_CLOSESTENCLOSER] = name;
} else if (NEEDNODATA(val) &&
proofs[DNS_VALIDATOR_NODATAPROOF] == NULL)
{
proofs[DNS_VALIDATOR_NODATAPROOF] = name;
} else if (NEEDNOWILDCARD(val) &&
proofs[DNS_VALIDATOR_NOWILDCARDPROOF] ==
NULL)
{
proofs[DNS_VALIDATOR_NOWILDCARDPROOF] = name;
}
return (result);
}
if (result != ISC_R_SUCCESS) {
continue;
}
if (setclosest) {
proofs[DNS_VALIDATOR_CLOSESTENCLOSER] = name;
}
if (exists && !data && NEEDNODATA(val)) {
val->attributes |= VALATTR_FOUNDNODATA;
proofs[DNS_VALIDATOR_NODATAPROOF] = name;
}
if (!exists && setnearest) {
val->attributes |= VALATTR_FOUNDNOQNAME;
proofs[DNS_VALIDATOR_NOQNAMEPROOF] = name;
if (optout) {
val->attributes |= VALATTR_FOUNDOPTOUT;
}
}
}
if (result == ISC_R_NOMORE) {
result = ISC_R_SUCCESS;
}
/*
* To know we have a valid noqname and optout proofs we need to also
* have a valid closest encloser. Otherwise we could still be looking
* at proofs from the parent zone.
*/
if (dns_name_countlabels(closest) > 0 &&
dns_name_countlabels(nearest) ==
dns_name_countlabels(closest) + 1 &&
dns_name_issubdomain(nearest, closest))
{
val->attributes |= VALATTR_FOUNDCLOSEST;
result = dns_name_concatenate(dns_wildcardname, closest,
dns_fixedname_name(&val->wild),
NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
} else {
val->attributes &= ~VALATTR_FOUNDNOQNAME;
val->attributes &= ~VALATTR_FOUNDOPTOUT;
proofs[DNS_VALIDATOR_NOQNAMEPROOF] = NULL;
}
/*
* Do we need to check for the wildcard?
*/
if (FOUNDNOQNAME(val) && FOUNDCLOSEST(val) &&
((NEEDNODATA(val) && !FOUNDNODATA(val)) || NEEDNOWILDCARD(val)))
{
result = checkwildcard(val, dns_rdatatype_nsec3, zonename);
if (result != ISC_R_SUCCESS) {
return (result);
}
}
return (result);
}
/*
* Start a validator for negative response data.
*
* Returns:
* \li DNS_R_CONTINUE Validation skipped, continue
* \li DNS_R_WAIT Validation is in progress
*
* \li Other return codes indicate failure.
*/
static isc_result_t
validate_neg_rrset(dns_validator_t *val, dns_name_t *name,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset) {
isc_result_t result;
/*
* If a signed zone is missing the zone key, bad
* things could happen. A query for data in the zone
* would lead to a query for the zone key, which
* would return a negative answer, which would contain
* an SOA and an NSEC signed by the missing key, which
* would trigger another query for the DNSKEY (since
* the first one is still in progress), and go into an
* infinite loop. Avoid that.
*/
if (val->event->type == dns_rdatatype_dnskey &&
rdataset->type == dns_rdatatype_nsec &&
dns_name_equal(name, val->event->name))
{
dns_rdata_t nsec = DNS_RDATA_INIT;
result = dns_rdataset_first(rdataset);
if (result != ISC_R_SUCCESS) {
return (result);
}
dns_rdataset_current(rdataset, &nsec);
if (dns_nsec_typepresent(&nsec, dns_rdatatype_soa)) {
return (DNS_R_CONTINUE);
}
}
val->currentset = rdataset;
result = create_validator(val, name, rdataset->type, rdataset,
sigrdataset, validator_callback_nsec,
"validate_neg_rrset");
if (result != ISC_R_SUCCESS) {
return (result);
}
val->authcount++;
return (DNS_R_WAIT);
}
/*%
* Validate the authority section records.
*/
static isc_result_t
validate_authority(dns_validator_t *val, bool resume) {
dns_name_t *name;
dns_message_t *message = val->event->message;
isc_result_t result;
if (!resume) {
result = dns_message_firstname(message, DNS_SECTION_AUTHORITY);
} else {
result = ISC_R_SUCCESS;
}
for (; result == ISC_R_SUCCESS;
result = dns_message_nextname(message, DNS_SECTION_AUTHORITY))
{
dns_rdataset_t *rdataset = NULL, *sigrdataset = NULL;
name = NULL;
dns_message_currentname(message, DNS_SECTION_AUTHORITY, &name);
if (resume) {
rdataset = ISC_LIST_NEXT(val->currentset, link);
val->currentset = NULL;
resume = false;
} else {
rdataset = ISC_LIST_HEAD(name->list);
}
for (; rdataset != NULL;
rdataset = ISC_LIST_NEXT(rdataset, link))
{
if (rdataset->type == dns_rdatatype_rrsig) {
continue;
}
for (sigrdataset = ISC_LIST_HEAD(name->list);
sigrdataset != NULL;
sigrdataset = ISC_LIST_NEXT(sigrdataset, link))
{
if (sigrdataset->type == dns_rdatatype_rrsig &&
sigrdataset->covers == rdataset->type)
{
break;
}
}
result = validate_neg_rrset(val, name, rdataset,
sigrdataset);
if (result != DNS_R_CONTINUE) {
return (result);
}
}
}
if (result == ISC_R_NOMORE) {
result = ISC_R_SUCCESS;
}
return (result);
}
/*%
* Validate negative cache elements.
*/
static isc_result_t
validate_ncache(dns_validator_t *val, bool resume) {
dns_name_t *name;
isc_result_t result;
if (!resume) {
result = dns_rdataset_first(val->event->rdataset);
} else {
result = dns_rdataset_next(val->event->rdataset);
}
for (; result == ISC_R_SUCCESS;
result = dns_rdataset_next(val->event->rdataset))
{
dns_rdataset_t *rdataset, *sigrdataset = NULL;
disassociate_rdatasets(val);
name = dns_fixedname_initname(&val->fname);
rdataset = &val->frdataset;
dns_ncache_current(val->event->rdataset, name, rdataset);
if (val->frdataset.type == dns_rdatatype_rrsig) {
continue;
}
result = dns_ncache_getsigrdataset(val->event->rdataset, name,
rdataset->type,
&val->fsigrdataset);
if (result == ISC_R_SUCCESS) {
sigrdataset = &val->fsigrdataset;
}
result = validate_neg_rrset(val, name, rdataset, sigrdataset);
if (result == DNS_R_CONTINUE) {
continue;
}
return (result);
}
if (result == ISC_R_NOMORE) {
result = ISC_R_SUCCESS;
}
return (result);
}
/*%
* Prove a negative answer is good or that there is a NOQNAME when the
* answer is from a wildcard.
*
* Loop through the authority section looking for NODATA, NOWILDCARD
* and NOQNAME proofs in the NSEC records by calling
* validator_callback_nsec().
*
* If the required proofs are found we are done.
*
* If the proofs are not found attempt to prove this is an unsecure
* response.
*/
static isc_result_t
validate_nx(dns_validator_t *val, bool resume) {
isc_result_t result;
if (resume) {
validator_log(val, ISC_LOG_DEBUG(3), "resuming validate_nx");
}
if (val->event->message == NULL) {
result = validate_ncache(val, resume);
} else {
result = validate_authority(val, resume);
}
if (result != ISC_R_SUCCESS) {
return (result);
}
/*
* Do we only need to check for NOQNAME? To get here we must have
* had a secure wildcard answer.
*/
if (!NEEDNODATA(val) && !NEEDNOWILDCARD(val) && NEEDNOQNAME(val)) {
if (!FOUNDNOQNAME(val)) {
result = findnsec3proofs(val);
if (result == DNS_R_NSEC3ITERRANGE) {
validator_log(val, ISC_LOG_DEBUG(3),
"too many iterations");
markanswer(val, "validate_nx (3)", NULL);
return (ISC_R_SUCCESS);
}
}
if (FOUNDNOQNAME(val) && FOUNDCLOSEST(val) && !FOUNDOPTOUT(val))
{
validator_log(val, ISC_LOG_DEBUG(3),
"marking as secure, noqname proof found");
marksecure(val->event);
return (ISC_R_SUCCESS);
} else if (FOUNDOPTOUT(val) &&
dns_name_countlabels(
dns_fixedname_name(&val->wild)) != 0)
{
validator_log(val, ISC_LOG_DEBUG(3),
"optout proof found");
val->event->optout = true;
markanswer(val, "validate_nx (1)", NULL);
return (ISC_R_SUCCESS);
} else if ((val->attributes & VALATTR_FOUNDUNKNOWN) != 0) {
validator_log(val, ISC_LOG_DEBUG(3),
"unknown NSEC3 hash algorithm found");
markanswer(val, "validate_nx (2)", NULL);
return (ISC_R_SUCCESS);
}
validator_log(val, ISC_LOG_DEBUG(3), "noqname proof not found");
return (DNS_R_NOVALIDNSEC);
}
if (!FOUNDNOQNAME(val) && !FOUNDNODATA(val)) {
result = findnsec3proofs(val);
if (result == DNS_R_NSEC3ITERRANGE) {
validator_log(val, ISC_LOG_DEBUG(3),
"too many iterations");
markanswer(val, "validate_nx (4)", NULL);
return (ISC_R_SUCCESS);
}
}
/*
* Do we need to check for the wildcard?
*/
if (FOUNDNOQNAME(val) && FOUNDCLOSEST(val) &&
((NEEDNODATA(val) && !FOUNDNODATA(val)) || NEEDNOWILDCARD(val)))
{
result = checkwildcard(val, dns_rdatatype_nsec, NULL);
if (result != ISC_R_SUCCESS) {
return (result);
}
}
if ((NEEDNODATA(val) && (FOUNDNODATA(val) || FOUNDOPTOUT(val))) ||
(NEEDNOQNAME(val) && FOUNDNOQNAME(val) && NEEDNOWILDCARD(val) &&
FOUNDNOWILDCARD(val) && FOUNDCLOSEST(val)))
{
if ((val->attributes & VALATTR_FOUNDOPTOUT) != 0) {
val->event->optout = true;
}
validator_log(val, ISC_LOG_DEBUG(3),
"nonexistence proof(s) found");
if (val->event->message == NULL) {
marksecure(val->event);
} else {
val->event->secure = true;
}
return (ISC_R_SUCCESS);
}
if (val->authfail != 0 && val->authcount == val->authfail) {
return (DNS_R_BROKENCHAIN);
}
validator_log(val, ISC_LOG_DEBUG(3), "nonexistence proof(s) not found");
return (proveunsecure(val, false, false));
}
/*%
* Check that DS rdataset has at least one record with
* a supported algorithm and digest.
*/
static bool
check_ds_algs(dns_validator_t *val, dns_name_t *name,
dns_rdataset_t *rdataset) {
dns_rdata_t dsrdata = DNS_RDATA_INIT;
dns_rdata_ds_t ds;
isc_result_t result;
for (result = dns_rdataset_first(rdataset); result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset))
{
dns_rdataset_current(rdataset, &dsrdata);
result = dns_rdata_tostruct(&dsrdata, &ds, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
if (dns_resolver_ds_digest_supported(val->view->resolver, name,
ds.digest_type) &&
dns_resolver_algorithm_supported(val->view->resolver, name,
ds.algorithm))
{
dns_rdata_reset(&dsrdata);
return (true);
}
dns_rdata_reset(&dsrdata);
}
return (false);
}
/*%
* seek_ds is called to look up DS rrsets at the label of val->event->name
* indicated by val->labels. This is done while building an insecurity
* proof, and so it will attempt validation of NXDOMAIN, NXRRSET or CNAME
* responses.
*
* Returns:
* \li ISC_R_COMPLETE a result has been determined and copied
* into `*resp`; ISC_R_SUCCESS indicates that
* the name has been proven insecure and any
* other result indicates failure.
* \li DNS_R_CONTINUE result is indeterminate; caller should
* continue walking down labels.
*/
static isc_result_t
seek_ds(dns_validator_t *val, isc_result_t *resp) {
isc_result_t result;
char namebuf[DNS_NAME_FORMATSIZE];
dns_fixedname_t fixedfound;
dns_name_t *found = dns_fixedname_initname(&fixedfound);
dns_name_t *tname = dns_fixedname_initname(&val->fname);
if (val->labels == dns_name_countlabels(val->event->name)) {
dns_name_copynf(val->event->name, tname);
} else {
dns_name_split(val->event->name, val->labels, NULL, tname);
}
dns_name_format(tname, namebuf, sizeof(namebuf));
validator_log(val, ISC_LOG_DEBUG(3), "checking existence of DS at '%s'",
namebuf);
result = view_find(val, tname, dns_rdatatype_ds);
switch (result) {
case ISC_R_SUCCESS:
/*
* There is a DS here. If it's already been
* validated, continue walking down labels.
*/
if (val->frdataset.trust >= dns_trust_secure) {
if (!check_ds_algs(val, tname, &val->frdataset)) {
validator_log(val, ISC_LOG_DEBUG(3),
"no supported algorithm/"
"digest (%s/DS)",
namebuf);
*resp = markanswer(val, "proveunsecure (5)",
"no supported "
"algorithm/digest (DS)");
return (ISC_R_COMPLETE);
}
break;
}
/*
* Otherwise, try to validate it now.
*/
if (dns_rdataset_isassociated(&val->fsigrdataset)) {
result = create_validator(
val, tname, dns_rdatatype_ds, &val->frdataset,
&val->fsigrdataset, validator_callback_ds,
"proveunsecure");
*resp = DNS_R_WAIT;
if (result != ISC_R_SUCCESS) {
*resp = result;
}
} else {
/*
* There should never be an unsigned DS.
*/
validator_log(val, ISC_LOG_DEBUG(3),
"unsigned DS record");
*resp = DNS_R_NOVALIDSIG;
}
return (ISC_R_COMPLETE);
case ISC_R_NOTFOUND:
/*
* We don't know anything about the DS. Find it.
*/
*resp = DNS_R_WAIT;
result = create_fetch(val, tname, dns_rdatatype_ds,
fetch_callback_ds, "proveunsecure");
if (result != ISC_R_SUCCESS) {
*resp = result;
}
return (ISC_R_COMPLETE);
case DNS_R_NXRRSET:
case DNS_R_NCACHENXRRSET:
/*
* There is no DS. If this is a delegation,
* we may be done.
*
* If we have "trust == answer" then this namespace
* has switched from insecure to should be secure.
*/
if (DNS_TRUST_PENDING(val->frdataset.trust) ||
DNS_TRUST_ANSWER(val->frdataset.trust))
{
result = create_validator(
val, tname, dns_rdatatype_ds, &val->frdataset,
&val->fsigrdataset, validator_callback_ds,
"proveunsecure");
*resp = DNS_R_WAIT;
if (result != ISC_R_SUCCESS) {
*resp = result;
}
return (ISC_R_COMPLETE);
}
/*
* Zones using NSEC3 don't return a NSEC RRset so
* we need to use dns_view_findzonecut2 to find
* the zone cut.
*/
if (result == DNS_R_NXRRSET &&
!dns_rdataset_isassociated(&val->frdataset) &&
dns_view_findzonecut(val->view, tname, found, NULL, 0, 0,
false, false, NULL,
NULL) == ISC_R_SUCCESS &&
dns_name_equal(tname, found))
{
*resp = markanswer(val, "proveunsecure (3)",
"no DS at zone cut");
return (ISC_R_COMPLETE);
}
if (val->frdataset.trust < dns_trust_secure) {
/*
* This shouldn't happen, since the negative
* response should have been validated. Since
* there's no way of validating existing
* negative response blobs, give up.
*/
validator_log(val, ISC_LOG_WARNING,
"can't validate existing "
"negative responses (no DS)");
*resp = DNS_R_MUSTBESECURE;
return (ISC_R_COMPLETE);
}
if (isdelegation(tname, &val->frdataset, result)) {
*resp = markanswer(val, "proveunsecure (4)",
"this is a delegation");
return (ISC_R_COMPLETE);
}
break;
case DNS_R_NXDOMAIN:
case DNS_R_NCACHENXDOMAIN:
/*
* This is not a zone cut. Assuming things are
* as expected, continue.
*/
if (!dns_rdataset_isassociated(&val->frdataset)) {
/*
* There should be an NSEC here, since we
* are still in a secure zone.
*/
*resp = DNS_R_NOVALIDNSEC;
return (ISC_R_COMPLETE);
} else if (DNS_TRUST_PENDING(val->frdataset.trust) ||
DNS_TRUST_ANSWER(val->frdataset.trust))
{
/*
* If we have "trust == answer" then this
* namespace has switched from insecure to
* should be secure.
*/
*resp = DNS_R_WAIT;
result = create_validator(
val, tname, dns_rdatatype_ds, &val->frdataset,
&val->fsigrdataset, validator_callback_ds,
"proveunsecure");
if (result != ISC_R_SUCCESS) {
*resp = result;
}
return (ISC_R_COMPLETE);
} else if (val->frdataset.trust < dns_trust_secure) {
/*
* This shouldn't happen, since the negative
* response should have been validated. Since
* there's no way of validating existing
* negative response blobs, give up.
*/
validator_log(val, ISC_LOG_WARNING,
"can't validate existing "
"negative responses "
"(not a zone cut)");
*resp = DNS_R_NOVALIDSIG;
return (ISC_R_COMPLETE);
}
break;
case DNS_R_CNAME:
if (DNS_TRUST_PENDING(val->frdataset.trust) ||
DNS_TRUST_ANSWER(val->frdataset.trust))
{
result = create_validator(
val, tname, dns_rdatatype_cname,
&val->frdataset, &val->fsigrdataset,
validator_callback_cname,
"proveunsecure "
"(cname)");
*resp = DNS_R_WAIT;
if (result != ISC_R_SUCCESS) {
*resp = result;
}
return (ISC_R_COMPLETE);
}
break;
default:
*resp = result;
return (ISC_R_COMPLETE);
}
/*
* No definite answer yet; continue walking down labels.
*/
return (DNS_R_CONTINUE);
}
/*%
* proveunsecure walks down, label by label, from the closest enclosing
* trust anchor to the name that is being validated, looking for an
* endpoint in the chain of trust. That occurs when we can prove that
* a DS record does not exist at a delegation point, or that a DS exists
* at a delegation point but we don't support its algorithm/digest. If
* no such endpoint is found, then the response should have been secure.
*
* Returns:
* \li ISC_R_SUCCESS val->event->name is in an unsecure zone
* \li DNS_R_WAIT validation is in progress.
* \li DNS_R_MUSTBESECURE val->event->name is supposed to be secure
* (policy) but we proved that it is unsecure.
* \li DNS_R_NOVALIDSIG
* \li DNS_R_NOVALIDNSEC
* \li DNS_R_NOTINSECURE
* \li DNS_R_BROKENCHAIN
*/
static isc_result_t
proveunsecure(dns_validator_t *val, bool have_ds, bool resume) {
isc_result_t result;
char namebuf[DNS_NAME_FORMATSIZE];
dns_fixedname_t fixedsecroot;
dns_name_t *secroot = dns_fixedname_initname(&fixedsecroot);
unsigned int labels;
/*
* We're attempting to prove insecurity.
*/
val->attributes |= VALATTR_INSECURITY;
dns_name_copynf(val->event->name, secroot);
/*
* If this is a response to a DS query, we need to look in
* the parent zone for the trust anchor.
*/
labels = dns_name_countlabels(secroot);
if (val->event->type == dns_rdatatype_ds && labels > 1U) {
dns_name_getlabelsequence(secroot, 1, labels - 1, secroot);
}
result = dns_keytable_finddeepestmatch(val->keytable, secroot, secroot);
if (result == ISC_R_NOTFOUND) {
validator_log(val, ISC_LOG_DEBUG(3), "not beneath secure root");
return (markanswer(val, "proveunsecure (1)",
"not beneath secure root"));
} else if (result != ISC_R_SUCCESS) {
return (result);
}
if (!resume) {
/*
* We are looking for interruptions in the chain of trust.
* That can only happen *below* the trust anchor, so we
* start looking at the next label down.
*/
val->labels = dns_name_countlabels(secroot) + 1;
} else {
validator_log(val, ISC_LOG_DEBUG(3), "resuming proveunsecure");
/*
* If we have a DS rdataset and it is secure, check whether
* it has a supported algorithm combination. If not, this is
* an insecure delegation as far as this resolver is concerned.
*/
if (have_ds && val->frdataset.trust >= dns_trust_secure &&
!check_ds_algs(val, dns_fixedname_name(&val->fname),
&val->frdataset))
{
dns_name_format(dns_fixedname_name(&val->fname),
namebuf, sizeof(namebuf));
validator_log(val, ISC_LOG_DEBUG(3),
"no supported algorithm/digest (%s/DS)",
namebuf);
result = markanswer(val, "proveunsecure (2)", namebuf);
goto out;
}
val->labels++;
}
/*
* Walk down through each of the remaining labels in the name,
* looking for DS records.
*/
while (val->labels <= dns_name_countlabels(val->event->name)) {
isc_result_t tresult;
result = seek_ds(val, &tresult);
if (result == ISC_R_COMPLETE) {
result = tresult;
goto out;
}
INSIST(result == DNS_R_CONTINUE);
val->labels++;
}
/* Couldn't complete insecurity proof. */
validator_log(val, ISC_LOG_DEBUG(3), "insecurity proof failed: %s",
isc_result_totext(result));
return (DNS_R_NOTINSECURE);
out:
if (result != DNS_R_WAIT) {
disassociate_rdatasets(val);
}
return (result);
}
/*%
* Start the validation process.
*
* Attempt to validate the answer based on the category it appears to
* fall in.
* \li 1. secure positive answer.
* \li 2. unsecure positive answer.
* \li 3. a negative answer (secure or unsecure).
*
* Note an answer that appears to be a secure positive answer may actually
* be an unsecure positive answer.
*/
static void
validator_start(isc_task_t *task, isc_event_t *event) {
dns_validator_t *val;
dns_validatorevent_t *vevent;
bool want_destroy = false;
isc_result_t result = ISC_R_FAILURE;
UNUSED(task);
REQUIRE(event->ev_type == DNS_EVENT_VALIDATORSTART);
vevent = (dns_validatorevent_t *)event;
val = vevent->validator;
/* If the validator has been canceled, val->event == NULL */
if (val->event == NULL) {
return;
}
validator_log(val, ISC_LOG_DEBUG(3), "starting");
LOCK(&val->lock);
if (val->event->rdataset != NULL && val->event->sigrdataset != NULL) {
isc_result_t saved_result;
/*
* This looks like a simple validation. We say "looks like"
* because it might end up requiring an insecurity proof.
*/
validator_log(val, ISC_LOG_DEBUG(3),
"attempting positive response validation");
INSIST(dns_rdataset_isassociated(val->event->rdataset));
INSIST(dns_rdataset_isassociated(val->event->sigrdataset));
if (selfsigned_dnskey(val)) {
result = validate_dnskey(val);
} else {
result = validate_answer(val, false);
}
if (result == DNS_R_NOVALIDSIG &&
(val->attributes & VALATTR_TRIEDVERIFY) == 0)
{
saved_result = result;
validator_log(val, ISC_LOG_DEBUG(3),
"falling back to insecurity proof");
result = proveunsecure(val, false, false);
if (result == DNS_R_NOTINSECURE) {
result = saved_result;
}
}
} else if (val->event->rdataset != NULL &&
val->event->rdataset->type != 0)
{
/*
* This is either an unsecure subdomain or a response
* from a broken server.
*/
INSIST(dns_rdataset_isassociated(val->event->rdataset));
validator_log(val, ISC_LOG_DEBUG(3),
"attempting insecurity proof");
result = proveunsecure(val, false, false);
if (result == DNS_R_NOTINSECURE) {
validator_log(val, ISC_LOG_INFO,
"got insecure response; "
"parent indicates it should be secure");
}
} else if ((val->event->rdataset == NULL &&
val->event->sigrdataset == NULL))
{
/*
* This is a validation of a negative response.
*/
validator_log(val, ISC_LOG_DEBUG(3),
"attempting negative response validation "
"from message");
if (val->event->message->rcode == dns_rcode_nxdomain) {
val->attributes |= VALATTR_NEEDNOQNAME;
val->attributes |= VALATTR_NEEDNOWILDCARD;
} else {
val->attributes |= VALATTR_NEEDNODATA;
}
result = validate_nx(val, false);
} else if ((val->event->rdataset != NULL &&
NEGATIVE(val->event->rdataset)))
{
/*
* This is a delayed validation of a negative cache entry.
*/
validator_log(val, ISC_LOG_DEBUG(3),
"attempting negative response validation "
"from cache");
if (NXDOMAIN(val->event->rdataset)) {
val->attributes |= VALATTR_NEEDNOQNAME;
val->attributes |= VALATTR_NEEDNOWILDCARD;
} else {
val->attributes |= VALATTR_NEEDNODATA;
}
result = validate_nx(val, false);
} else {
UNREACHABLE();
}
if (result != DNS_R_WAIT) {
want_destroy = exit_check(val);
validator_done(val, result);
}
UNLOCK(&val->lock);
if (want_destroy) {
destroy(val);
}
}
isc_result_t
dns_validator_create(dns_view_t *view, dns_name_t *name, dns_rdatatype_t type,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset,
dns_message_t *message, unsigned int options,
isc_task_t *task, isc_taskaction_t action, void *arg,
dns_validator_t **validatorp) {
isc_result_t result = ISC_R_FAILURE;
dns_validator_t *val;
isc_task_t *tclone = NULL;
dns_validatorevent_t *event;
REQUIRE(name != NULL);
REQUIRE(rdataset != NULL ||
(rdataset == NULL && sigrdataset == NULL && message != NULL));
REQUIRE(validatorp != NULL && *validatorp == NULL);
event = (dns_validatorevent_t *)isc_event_allocate(
view->mctx, task, DNS_EVENT_VALIDATORSTART, validator_start,
NULL, sizeof(dns_validatorevent_t));
isc_task_attach(task, &tclone);
event->result = ISC_R_FAILURE;
event->name = name;
event->type = type;
event->rdataset = rdataset;
event->sigrdataset = sigrdataset;
event->message = message;
memset(event->proofs, 0, sizeof(event->proofs));
event->optout = false;
event->secure = false;
val = isc_mem_get(view->mctx, sizeof(*val));
*val = (dns_validator_t){ .event = event,
.options = options,
.task = task,
.action = action,
.arg = arg };
dns_view_weakattach(view, &val->view);
isc_mutex_init(&val->lock);
result = dns_view_getsecroots(val->view, &val->keytable);
if (result != ISC_R_SUCCESS) {
goto cleanup;
}
val->mustbesecure = dns_resolver_getmustbesecure(view->resolver, name);
dns_rdataset_init(&val->fdsset);
dns_rdataset_init(&val->frdataset);
dns_rdataset_init(&val->fsigrdataset);
dns_fixedname_init(&val->wild);
dns_fixedname_init(&val->closest);
isc_stdtime_get(&val->start);
ISC_LINK_INIT(val, link);
val->magic = VALIDATOR_MAGIC;
event->validator = val;
if ((options & DNS_VALIDATOR_DEFER) == 0) {
isc_task_send(task, ISC_EVENT_PTR(&event));
}
*validatorp = val;
return (ISC_R_SUCCESS);
cleanup:
isc_mutex_destroy(&val->lock);
isc_task_detach(&tclone);
isc_event_free(ISC_EVENT_PTR(&event));
dns_view_weakdetach(&val->view);
isc_mem_put(view->mctx, val, sizeof(*val));
return (result);
}
void
dns_validator_send(dns_validator_t *validator) {
isc_event_t *event;
REQUIRE(VALID_VALIDATOR(validator));
LOCK(&validator->lock);
INSIST((validator->options & DNS_VALIDATOR_DEFER) != 0);
event = (isc_event_t *)validator->event;
validator->options &= ~DNS_VALIDATOR_DEFER;
UNLOCK(&validator->lock);
isc_task_send(validator->task, ISC_EVENT_PTR(&event));
}
void
dns_validator_cancel(dns_validator_t *validator) {
dns_fetch_t *fetch = NULL;
REQUIRE(VALID_VALIDATOR(validator));
LOCK(&validator->lock);
validator_log(validator, ISC_LOG_DEBUG(3), "dns_validator_cancel");
if ((validator->attributes & VALATTR_CANCELED) == 0) {
validator->attributes |= VALATTR_CANCELED;
if (validator->event != NULL) {
fetch = validator->fetch;
validator->fetch = NULL;
if (validator->subvalidator != NULL) {
dns_validator_cancel(validator->subvalidator);
}
if ((validator->options & DNS_VALIDATOR_DEFER) != 0) {
validator->options &= ~DNS_VALIDATOR_DEFER;
validator_done(validator, ISC_R_CANCELED);
}
}
}
UNLOCK(&validator->lock);
/* Need to cancel and destroy the fetch outside validator lock */
if (fetch != NULL) {
dns_resolver_cancelfetch(fetch);
dns_resolver_destroyfetch(&fetch);
}
}
static void
destroy(dns_validator_t *val) {
isc_mem_t *mctx;
REQUIRE(SHUTDOWN(val));
REQUIRE(val->event == NULL);
REQUIRE(val->fetch == NULL);
val->magic = 0;
if (val->key != NULL) {
dst_key_free(&val->key);
}
if (val->keytable != NULL) {
dns_keytable_detach(&val->keytable);
}
if (val->subvalidator != NULL) {
dns_validator_destroy(&val->subvalidator);
}
disassociate_rdatasets(val);
mctx = val->view->mctx;
if (val->siginfo != NULL) {
isc_mem_put(mctx, val->siginfo, sizeof(*val->siginfo));
}
isc_mutex_destroy(&val->lock);
dns_view_weakdetach(&val->view);
isc_mem_put(mctx, val, sizeof(*val));
}
void
dns_validator_destroy(dns_validator_t **validatorp) {
dns_validator_t *val;
bool want_destroy = false;
REQUIRE(validatorp != NULL);
val = *validatorp;
*validatorp = NULL;
REQUIRE(VALID_VALIDATOR(val));
LOCK(&val->lock);
val->attributes |= VALATTR_SHUTDOWN;
validator_log(val, ISC_LOG_DEBUG(4), "dns_validator_destroy");
want_destroy = exit_check(val);
UNLOCK(&val->lock);
if (want_destroy) {
destroy(val);
}
}
static void
validator_logv(dns_validator_t *val, isc_logcategory_t *category,
isc_logmodule_t *module, int level, const char *fmt,
va_list ap) {
char msgbuf[2048];
static const char spaces[] = " *";
int depth = val->depth * 2;
const char *viewname, *sep1, *sep2;
vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
if ((unsigned int)depth >= sizeof spaces) {
depth = sizeof spaces - 1;
}
/*
* Log the view name unless it's:
* * "_default/IN" (which means there's only one view
* configured in the server), or
* * "_dnsclient/IN" (which means this is being called
* from an application using dns/client.c).
*/
if (val->view->rdclass == dns_rdataclass_in &&
(strcmp(val->view->name, "_default") == 0 ||
strcmp(val->view->name, DNS_CLIENTVIEW_NAME) == 0))
{
sep1 = viewname = sep2 = "";
} else {
sep1 = "view ";
viewname = val->view->name;
sep2 = ": ";
}
if (val->event != NULL && val->event->name != NULL) {
char namebuf[DNS_NAME_FORMATSIZE];
char typebuf[DNS_RDATATYPE_FORMATSIZE];
dns_name_format(val->event->name, namebuf, sizeof(namebuf));
dns_rdatatype_format(val->event->type, typebuf,
sizeof(typebuf));
isc_log_write(dns_lctx, category, module, level,
"%s%s%s%.*svalidating %s/%s: %s", sep1, viewname,
sep2, depth, spaces, namebuf, typebuf, msgbuf);
} else {
isc_log_write(dns_lctx, category, module, level,
"%s%s%s%.*svalidator @%p: %s", sep1, viewname,
sep2, depth, spaces, val, msgbuf);
}
}
static void
validator_log(void *val, int level, const char *fmt, ...) {
va_list ap;
if (!isc_log_wouldlog(dns_lctx, level)) {
return;
}
va_start(ap, fmt);
validator_logv(val, DNS_LOGCATEGORY_DNSSEC, DNS_LOGMODULE_VALIDATOR,
level, fmt, ap);
va_end(ap);
}
static void
validator_logcreate(dns_validator_t *val, dns_name_t *name,
dns_rdatatype_t type, const char *caller,
const char *operation) {
char namestr[DNS_NAME_FORMATSIZE];
char typestr[DNS_RDATATYPE_FORMATSIZE];
dns_name_format(name, namestr, sizeof(namestr));
dns_rdatatype_format(type, typestr, sizeof(typestr));
validator_log(val, ISC_LOG_DEBUG(9), "%s: creating %s for %s %s",
caller, operation, namestr, typestr);
}