update.c revision 9198ab377b1cbf07d6d0c6eec25296c135bd66bd
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews/*
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews * Copyright (C) 2004-2011 Internet Systems Consortium, Inc. ("ISC")
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews * Copyright (C) 1999-2003 Internet Software Consortium.
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews *
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews * Permission to use, copy, modify, and/or distribute this software for any
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews * purpose with or without fee is hereby granted, provided that the above
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews * copyright notice and this permission notice appear in all copies.
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews *
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews * PERFORMANCE OF THIS SOFTWARE.
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews */
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews/* $Id: update.c,v 1.4 2011/08/30 05:16:14 marka Exp $ */
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews#include <config.h>
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews#include <isc/log.h>
ecfedec0e0b7ae3dc3cbbf9b59f63732146c1387Mark Andrews#include <isc/netaddr.h>
#include <isc/print.h>
#include <isc/serial.h>
#include <isc/stats.h>
#include <isc/stdtime.h>
#include <isc/string.h>
#include <isc/taskpool.h>
#include <isc/util.h>
#include <dns/db.h>
#include <dns/dbiterator.h>
#include <dns/diff.h>
#include <dns/dnssec.h>
#include <dns/events.h>
#include <dns/fixedname.h>
#include <dns/journal.h>
#include <dns/keyvalues.h>
#include <dns/log.h>
#include <dns/message.h>
#include <dns/nsec.h>
#include <dns/nsec3.h>
#include <dns/private.h>
#include <dns/rdataclass.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/rdatastruct.h>
#include <dns/rdatatype.h>
#include <dns/result.h>
#include <dns/soa.h>
#include <dns/ssu.h>
#include <dns/tsig.h>
#include <dns/update.h>
#include <dns/view.h>
#include <dns/zone.h>
#include <dns/zt.h>
/**************************************************************************/
/*%
* Log level for tracing dynamic update protocol requests.
*/
#define LOGLEVEL_PROTOCOL ISC_LOG_INFO
/*%
* Log level for low-level debug tracing.
*/
#define LOGLEVEL_DEBUG ISC_LOG_DEBUG(8)
/*%
* Check an operation for failure. These macros all assume that
* the function using them has a 'result' variable and a 'failure'
* label.
*/
#define CHECK(op) \
do { result = (op); \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
/*%
* Fail unconditionally with result 'code', which must not
* be ISC_R_SUCCESS. The reason for failure presumably has
* been logged already.
*
* The test against ISC_R_SUCCESS is there to keep the Solaris compiler
* from complaining about "end-of-loop code not reached".
*/
#define FAIL(code) \
do { \
result = (code); \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
/*%
* Fail unconditionally and log as a client error.
* The test against ISC_R_SUCCESS is there to keep the Solaris compiler
* from complaining about "end-of-loop code not reached".
*/
#define FAILC(code, msg) \
do { \
const char *_what = "failed"; \
result = (code); \
switch (result) { \
case DNS_R_NXDOMAIN: \
case DNS_R_YXDOMAIN: \
case DNS_R_YXRRSET: \
case DNS_R_NXRRSET: \
_what = "unsuccessful"; \
} \
update_log(log, zone, LOGLEVEL_PROTOCOL, \
"update %s: %s (%s)", _what, \
msg, isc_result_totext(result)); \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
#define FAILN(code, name, msg) \
do { \
const char *_what = "failed"; \
result = (code); \
switch (result) { \
case DNS_R_NXDOMAIN: \
case DNS_R_YXDOMAIN: \
case DNS_R_YXRRSET: \
case DNS_R_NXRRSET: \
_what = "unsuccessful"; \
} \
if (isc_log_wouldlog(dns_lctx, LOGLEVEL_PROTOCOL)) { \
char _nbuf[DNS_NAME_FORMATSIZE]; \
dns_name_format(name, _nbuf, sizeof(_nbuf)); \
update_log(log, zone, LOGLEVEL_PROTOCOL, \
"update %s: %s: %s (%s)", _what, _nbuf, \
msg, isc_result_totext(result)); \
} \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
#define FAILNT(code, name, type, msg) \
do { \
const char *_what = "failed"; \
result = (code); \
switch (result) { \
case DNS_R_NXDOMAIN: \
case DNS_R_YXDOMAIN: \
case DNS_R_YXRRSET: \
case DNS_R_NXRRSET: \
_what = "unsuccessful"; \
} \
if (isc_log_wouldlog(dns_lctx, LOGLEVEL_PROTOCOL)) { \
char _nbuf[DNS_NAME_FORMATSIZE]; \
char _tbuf[DNS_RDATATYPE_FORMATSIZE]; \
dns_name_format(name, _nbuf, sizeof(_nbuf)); \
dns_rdatatype_format(type, _tbuf, sizeof(_tbuf)); \
update_log(log, zone, LOGLEVEL_PROTOCOL, \
"update %s: %s/%s: %s (%s)", \
_what, _nbuf, _tbuf, msg, \
isc_result_totext(result)); \
} \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
/*%
* Fail unconditionally and log as a server error.
* The test against ISC_R_SUCCESS is there to keep the Solaris compiler
* from complaining about "end-of-loop code not reached".
*/
#define FAILS(code, msg) \
do { \
result = (code); \
update_log(log, zone, LOGLEVEL_PROTOCOL, \
"error: %s: %s", \
msg, isc_result_totext(result)); \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
/**************************************************************************/
typedef struct rr rr_t;
struct rr {
/* dns_name_t name; */
isc_uint32_t ttl;
dns_rdata_t rdata;
};
typedef struct update_event update_event_t;
/**************************************************************************/
static void
update_log(dns_update_log_t *callback, dns_zone_t *zone,
int level, const char *fmt, ...) ISC_FORMAT_PRINTF(4, 5);
static void
update_log(dns_update_log_t *callback, dns_zone_t *zone,
int level, const char *fmt, ...)
{
va_list ap;
char message[4096];
if (callback == NULL)
return;
if (isc_log_wouldlog(dns_lctx, level) == ISC_FALSE)
return;
va_start(ap, fmt);
vsnprintf(message, sizeof(message), fmt, ap);
va_end(ap);
(callback->func)(callback->arg, zone, level, message);
}
/*%
* Update a single RR in version 'ver' of 'db' and log the
* update in 'diff'.
*
* Ensures:
* \li '*tuple' == NULL. Either the tuple is freed, or its
* ownership has been transferred to the diff.
*/
static isc_result_t
do_one_tuple(dns_difftuple_t **tuple, dns_db_t *db, dns_dbversion_t *ver,
dns_diff_t *diff)
{
dns_diff_t temp_diff;
isc_result_t result;
/*
* Create a singleton diff.
*/
dns_diff_init(diff->mctx, &temp_diff);
temp_diff.resign = diff->resign;
ISC_LIST_APPEND(temp_diff.tuples, *tuple, link);
/*
* Apply it to the database.
*/
result = dns_diff_apply(&temp_diff, db, ver);
ISC_LIST_UNLINK(temp_diff.tuples, *tuple, link);
if (result != ISC_R_SUCCESS) {
dns_difftuple_free(tuple);
return (result);
}
/*
* Merge it into the current pending journal entry.
*/
dns_diff_appendminimal(diff, tuple);
/*
* Do not clear temp_diff.
*/
return (ISC_R_SUCCESS);
}
static isc_result_t
update_one_rr(dns_db_t *db, dns_dbversion_t *ver, dns_diff_t *diff,
dns_diffop_t op, dns_name_t *name, dns_ttl_t ttl,
dns_rdata_t *rdata)
{
dns_difftuple_t *tuple = NULL;
isc_result_t result;
result = dns_difftuple_create(diff->mctx, op,
name, ttl, rdata, &tuple);
if (result != ISC_R_SUCCESS)
return (result);
return (do_one_tuple(&tuple, db, ver, diff));
}
/**************************************************************************/
/*
* Callback-style iteration over rdatasets and rdatas.
*
* foreach_rrset() can be used to iterate over the RRsets
* of a name and call a callback function with each
* one. Similarly, foreach_rr() can be used to iterate
* over the individual RRs at name, optionally restricted
* to RRs of a given type.
*
* The callback functions are called "actions" and take
* two arguments: a void pointer for passing arbitrary
* context information, and a pointer to the current RRset
* or RR. By convention, their names end in "_action".
*/
/*
* XXXRTH We might want to make this public somewhere in libdns.
*/
/*%
* Function type for foreach_rrset() iterator actions.
*/
typedef isc_result_t rrset_func(void *data, dns_rdataset_t *rrset);
/*%
* Function type for foreach_rr() iterator actions.
*/
typedef isc_result_t rr_func(void *data, rr_t *rr);
/*%
* Internal context struct for foreach_node_rr().
*/
typedef struct {
rr_func * rr_action;
void * rr_action_data;
} foreach_node_rr_ctx_t;
/*%
* Internal helper function for foreach_node_rr().
*/
static isc_result_t
foreach_node_rr_action(void *data, dns_rdataset_t *rdataset) {
isc_result_t result;
foreach_node_rr_ctx_t *ctx = data;
for (result = dns_rdataset_first(rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset))
{
rr_t rr = { 0, DNS_RDATA_INIT };
dns_rdataset_current(rdataset, &rr.rdata);
rr.ttl = rdataset->ttl;
result = (*ctx->rr_action)(ctx->rr_action_data, &rr);
if (result != ISC_R_SUCCESS)
return (result);
}
if (result != ISC_R_NOMORE)
return (result);
return (ISC_R_SUCCESS);
}
/*%
* For each rdataset of 'name' in 'ver' of 'db', call 'action'
* with the rdataset and 'action_data' as arguments. If the name
* does not exist, do nothing.
*
* If 'action' returns an error, abort iteration and return the error.
*/
static isc_result_t
foreach_rrset(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
rrset_func *action, void *action_data)
{
isc_result_t result;
dns_dbnode_t *node;
dns_rdatasetiter_t *iter;
node = NULL;
result = dns_db_findnode(db, name, ISC_FALSE, &node);
if (result == ISC_R_NOTFOUND)
return (ISC_R_SUCCESS);
if (result != ISC_R_SUCCESS)
return (result);
iter = NULL;
result = dns_db_allrdatasets(db, node, ver,
(isc_stdtime_t) 0, &iter);
if (result != ISC_R_SUCCESS)
goto cleanup_node;
for (result = dns_rdatasetiter_first(iter);
result == ISC_R_SUCCESS;
result = dns_rdatasetiter_next(iter))
{
dns_rdataset_t rdataset;
dns_rdataset_init(&rdataset);
dns_rdatasetiter_current(iter, &rdataset);
result = (*action)(action_data, &rdataset);
dns_rdataset_disassociate(&rdataset);
if (result != ISC_R_SUCCESS)
goto cleanup_iterator;
}
if (result == ISC_R_NOMORE)
result = ISC_R_SUCCESS;
cleanup_iterator:
dns_rdatasetiter_destroy(&iter);
cleanup_node:
dns_db_detachnode(db, &node);
return (result);
}
/*%
* For each RR of 'name' in 'ver' of 'db', call 'action'
* with the RR and 'action_data' as arguments. If the name
* does not exist, do nothing.
*
* If 'action' returns an error, abort iteration
* and return the error.
*/
static isc_result_t
foreach_node_rr(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
rr_func *rr_action, void *rr_action_data)
{
foreach_node_rr_ctx_t ctx;
ctx.rr_action = rr_action;
ctx.rr_action_data = rr_action_data;
return (foreach_rrset(db, ver, name,
foreach_node_rr_action, &ctx));
}
/*%
* For each of the RRs specified by 'db', 'ver', 'name', 'type',
* (which can be dns_rdatatype_any to match any type), and 'covers', call
* 'action' with the RR and 'action_data' as arguments. If the name
* does not exist, or if no RRset of the given type exists at the name,
* do nothing.
*
* If 'action' returns an error, abort iteration and return the error.
*/
static isc_result_t
foreach_rr(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
dns_rdatatype_t type, dns_rdatatype_t covers, rr_func *rr_action,
void *rr_action_data)
{
isc_result_t result;
dns_dbnode_t *node;
dns_rdataset_t rdataset;
if (type == dns_rdatatype_any)
return (foreach_node_rr(db, ver, name,
rr_action, rr_action_data));
node = NULL;
if (type == dns_rdatatype_nsec3 ||
(type == dns_rdatatype_rrsig && covers == dns_rdatatype_nsec3))
result = dns_db_findnsec3node(db, name, ISC_FALSE, &node);
else
result = dns_db_findnode(db, name, ISC_FALSE, &node);
if (result == ISC_R_NOTFOUND)
return (ISC_R_SUCCESS);
if (result != ISC_R_SUCCESS)
return (result);
dns_rdataset_init(&rdataset);
result = dns_db_findrdataset(db, node, ver, type, covers,
(isc_stdtime_t) 0, &rdataset, NULL);
if (result == ISC_R_NOTFOUND) {
result = ISC_R_SUCCESS;
goto cleanup_node;
}
if (result != ISC_R_SUCCESS)
goto cleanup_node;
for (result = dns_rdataset_first(&rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(&rdataset))
{
rr_t rr = { 0, DNS_RDATA_INIT };
dns_rdataset_current(&rdataset, &rr.rdata);
rr.ttl = rdataset.ttl;
result = (*rr_action)(rr_action_data, &rr);
if (result != ISC_R_SUCCESS)
goto cleanup_rdataset;
}
if (result != ISC_R_NOMORE)
goto cleanup_rdataset;
result = ISC_R_SUCCESS;
cleanup_rdataset:
dns_rdataset_disassociate(&rdataset);
cleanup_node:
dns_db_detachnode(db, &node);
return (result);
}
/**************************************************************************/
/*
* Various tests on the database contents (for prerequisites, etc).
*/
/*%
* Function type for predicate functions that compare a database RR 'db_rr'
* against an update RR 'update_rr'.
*/
typedef isc_boolean_t rr_predicate(dns_rdata_t *update_rr, dns_rdata_t *db_rr);
/*%
* Helper function for rrset_exists().
*/
static isc_result_t
rrset_exists_action(void *data, rr_t *rr) {
UNUSED(data);
UNUSED(rr);
return (ISC_R_EXISTS);
}
/*%
* Utility macro for RR existence checking functions.
*
* If the variable 'result' has the value ISC_R_EXISTS or
* ISC_R_SUCCESS, set *exists to ISC_TRUE or ISC_FALSE,
* respectively, and return success.
*
* If 'result' has any other value, there was a failure.
* Return the failure result code and do not set *exists.
*
* This would be more readable as "do { if ... } while(0)",
* but that form generates tons of warnings on Solaris 2.6.
*/
#define RETURN_EXISTENCE_FLAG \
return ((result == ISC_R_EXISTS) ? \
(*exists = ISC_TRUE, ISC_R_SUCCESS) : \
((result == ISC_R_SUCCESS) ? \
(*exists = ISC_FALSE, ISC_R_SUCCESS) : \
result))
/*%
* Set '*exists' to true iff an rrset of the given type exists,
* to false otherwise.
*/
static isc_result_t
rrset_exists(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
dns_rdatatype_t type, dns_rdatatype_t covers,
isc_boolean_t *exists)
{
isc_result_t result;
result = foreach_rr(db, ver, name, type, covers,
rrset_exists_action, NULL);
RETURN_EXISTENCE_FLAG;
}
/*%
* Set '*visible' to true if the RRset exists and is part of the
* visible zone. Otherwise '*visible' is set to false unless a
* error occurs.
*/
static isc_result_t
rrset_visible(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
dns_rdatatype_t type, isc_boolean_t *visible)
{
isc_result_t result;
dns_fixedname_t fixed;
dns_fixedname_init(&fixed);
result = dns_db_find(db, name, ver, type, DNS_DBFIND_NOWILD,
(isc_stdtime_t) 0, NULL,
dns_fixedname_name(&fixed), NULL, NULL);
switch (result) {
case ISC_R_SUCCESS:
*visible = ISC_TRUE;
break;
/*
* Glue, obscured, deleted or replaced records.
*/
case DNS_R_DELEGATION:
case DNS_R_DNAME:
case DNS_R_CNAME:
case DNS_R_NXDOMAIN:
case DNS_R_NXRRSET:
case DNS_R_EMPTYNAME:
case DNS_R_COVERINGNSEC:
*visible = ISC_FALSE;
result = ISC_R_SUCCESS;
break;
default:
break;
}
return (result);
}
/*%
* Context struct and helper function for name_exists().
*/
static isc_result_t
name_exists_action(void *data, dns_rdataset_t *rrset) {
UNUSED(data);
UNUSED(rrset);
return (ISC_R_EXISTS);
}
/*%
* Set '*exists' to true iff the given name exists, to false otherwise.
*/
static isc_result_t
name_exists(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
isc_boolean_t *exists)
{
isc_result_t result;
result = foreach_rrset(db, ver, name,
name_exists_action, NULL);
RETURN_EXISTENCE_FLAG;
}
/**************************************************************************/
/*
* Checking of "RRset exists (value dependent)" prerequisites.
*
* In the RFC2136 section 3.2.5, this is the pseudocode involving
* a variable called "temp", a mapping of <name, type> tuples to rrsets.
*
* Here, we represent the "temp" data structure as (non-minimal) "dns_diff_t"
* where each tuple has op==DNS_DIFFOP_EXISTS.
*/
/*%
* A comparison function defining the sorting order for the entries
* in the "temp" data structure. The major sort key is the owner name,
* followed by the type and rdata.
*/
static int
temp_order(const void *av, const void *bv) {
dns_difftuple_t const * const *ap = av;
dns_difftuple_t const * const *bp = bv;
dns_difftuple_t const *a = *ap;
dns_difftuple_t const *b = *bp;
int r;
r = dns_name_compare(&a->name, &b->name);
if (r != 0)
return (r);
r = (b->rdata.type - a->rdata.type);
if (r != 0)
return (r);
r = dns_rdata_casecompare(&a->rdata, &b->rdata);
return (r);
}
/**************************************************************************/
/*
* Conditional deletion of RRs.
*/
/*%
* Context structure for delete_if().
*/
typedef struct {
rr_predicate *predicate;
dns_db_t *db;
dns_dbversion_t *ver;
dns_diff_t *diff;
dns_name_t *name;
dns_rdata_t *update_rr;
} conditional_delete_ctx_t;
/*%
* Predicate functions for delete_if().
*/
/*%
* Return true always.
*/
static isc_boolean_t
true_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) {
UNUSED(update_rr);
UNUSED(db_rr);
return (ISC_TRUE);
}
/*%
* Return true if the record is a RRSIG.
*/
static isc_boolean_t
rrsig_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) {
UNUSED(update_rr);
return ((db_rr->type == dns_rdatatype_rrsig) ?
ISC_TRUE : ISC_FALSE);
}
/*%
* Internal helper function for delete_if().
*/
static isc_result_t
delete_if_action(void *data, rr_t *rr) {
conditional_delete_ctx_t *ctx = data;
if ((*ctx->predicate)(ctx->update_rr, &rr->rdata)) {
isc_result_t result;
result = update_one_rr(ctx->db, ctx->ver, ctx->diff,
DNS_DIFFOP_DEL, ctx->name,
rr->ttl, &rr->rdata);
return (result);
} else {
return (ISC_R_SUCCESS);
}
}
/*%
* Conditionally delete RRs. Apply 'predicate' to the RRs
* specified by 'db', 'ver', 'name', and 'type' (which can
* be dns_rdatatype_any to match any type). Delete those
* RRs for which the predicate returns true, and log the
* deletions in 'diff'.
*/
static isc_result_t
delete_if(rr_predicate *predicate, dns_db_t *db, dns_dbversion_t *ver,
dns_name_t *name, dns_rdatatype_t type, dns_rdatatype_t covers,
dns_rdata_t *update_rr, dns_diff_t *diff)
{
conditional_delete_ctx_t ctx;
ctx.predicate = predicate;
ctx.db = db;
ctx.ver = ver;
ctx.diff = diff;
ctx.name = name;
ctx.update_rr = update_rr;
return (foreach_rr(db, ver, name, type, covers,
delete_if_action, &ctx));
}
/**************************************************************************/
/*
* Incremental updating of NSECs and RRSIGs.
*/
#define MAXZONEKEYS 32 /*%< Maximum number of zone keys supported. */
/*%
* We abuse the dns_diff_t type to represent a set of domain names
* affected by the update.
*/
static isc_result_t
namelist_append_name(dns_diff_t *list, dns_name_t *name) {
isc_result_t result;
dns_difftuple_t *tuple = NULL;
static dns_rdata_t dummy_rdata = DNS_RDATA_INIT;
CHECK(dns_difftuple_create(list->mctx, DNS_DIFFOP_EXISTS, name, 0,
&dummy_rdata, &tuple));
dns_diff_append(list, &tuple);
failure:
return (result);
}
static isc_result_t
namelist_append_subdomain(dns_db_t *db, dns_name_t *name, dns_diff_t *affected)
{
isc_result_t result;
dns_fixedname_t fixedname;
dns_name_t *child;
dns_dbiterator_t *dbit = NULL;
dns_fixedname_init(&fixedname);
child = dns_fixedname_name(&fixedname);
CHECK(dns_db_createiterator(db, DNS_DB_NONSEC3, &dbit));
for (result = dns_dbiterator_seek(dbit, name);
result == ISC_R_SUCCESS;
result = dns_dbiterator_next(dbit))
{
dns_dbnode_t *node = NULL;
CHECK(dns_dbiterator_current(dbit, &node, child));
dns_db_detachnode(db, &node);
if (! dns_name_issubdomain(child, name))
break;
CHECK(namelist_append_name(affected, child));
}
if (result == ISC_R_NOMORE)
result = ISC_R_SUCCESS;
failure:
if (dbit != NULL)
dns_dbiterator_destroy(&dbit);
return (result);
}
/*%
* Helper function for non_nsec_rrset_exists().
*/
static isc_result_t
is_non_nsec_action(void *data, dns_rdataset_t *rrset) {
UNUSED(data);
if (!(rrset->type == dns_rdatatype_nsec ||
rrset->type == dns_rdatatype_nsec3 ||
(rrset->type == dns_rdatatype_rrsig &&
(rrset->covers == dns_rdatatype_nsec ||
rrset->covers == dns_rdatatype_nsec3))))
return (ISC_R_EXISTS);
return (ISC_R_SUCCESS);
}
/*%
* Check whether there is an rrset other than a NSEC or RRSIG NSEC,
* i.e., anything that justifies the continued existence of a name
* after a secure update.
*
* If such an rrset exists, set '*exists' to ISC_TRUE.
* Otherwise, set it to ISC_FALSE.
*/
static isc_result_t
non_nsec_rrset_exists(dns_db_t *db, dns_dbversion_t *ver,
dns_name_t *name, isc_boolean_t *exists)
{
isc_result_t result;
result = foreach_rrset(db, ver, name, is_non_nsec_action, NULL);
RETURN_EXISTENCE_FLAG;
}
/*%
* A comparison function for sorting dns_diff_t:s by name.
*/
static int
name_order(const void *av, const void *bv) {
dns_difftuple_t const * const *ap = av;
dns_difftuple_t const * const *bp = bv;
dns_difftuple_t const *a = *ap;
dns_difftuple_t const *b = *bp;
return (dns_name_compare(&a->name, &b->name));
}
static isc_result_t
uniqify_name_list(dns_diff_t *list) {
isc_result_t result;
dns_difftuple_t *p, *q;
CHECK(dns_diff_sort(list, name_order));
p = ISC_LIST_HEAD(list->tuples);
while (p != NULL) {
do {
q = ISC_LIST_NEXT(p, link);
if (q == NULL || ! dns_name_equal(&p->name, &q->name))
break;
ISC_LIST_UNLINK(list->tuples, q, link);
dns_difftuple_free(&q);
} while (1);
p = ISC_LIST_NEXT(p, link);
}
failure:
return (result);
}
static isc_result_t
is_active(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
isc_boolean_t *flag, isc_boolean_t *cut, isc_boolean_t *unsecure)
{
isc_result_t result;
dns_fixedname_t foundname;
dns_fixedname_init(&foundname);
result = dns_db_find(db, name, ver, dns_rdatatype_any,
DNS_DBFIND_GLUEOK | DNS_DBFIND_NOWILD,
(isc_stdtime_t) 0, NULL,
dns_fixedname_name(&foundname),
NULL, NULL);
if (result == ISC_R_SUCCESS || result == DNS_R_EMPTYNAME) {
*flag = ISC_TRUE;
*cut = ISC_FALSE;
if (unsecure != NULL)
*unsecure = ISC_FALSE;
return (ISC_R_SUCCESS);
} else if (result == DNS_R_ZONECUT) {
*flag = ISC_TRUE;
*cut = ISC_TRUE;
if (unsecure != NULL) {
/*
* We are at the zonecut. Check to see if there
* is a DS RRset.
*/
if (dns_db_find(db, name, ver, dns_rdatatype_ds, 0,
(isc_stdtime_t) 0, NULL,
dns_fixedname_name(&foundname),
NULL, NULL) == DNS_R_NXRRSET)
*unsecure = ISC_TRUE;
else
*unsecure = ISC_FALSE;
}
return (ISC_R_SUCCESS);
} else if (result == DNS_R_GLUE || result == DNS_R_DNAME ||
result == DNS_R_DELEGATION || result == DNS_R_NXDOMAIN) {
*flag = ISC_FALSE;
*cut = ISC_FALSE;
if (unsecure != NULL)
*unsecure = ISC_FALSE;
return (ISC_R_SUCCESS);
} else {
/*
* Silence compiler.
*/
*flag = ISC_FALSE;
*cut = ISC_FALSE;
if (unsecure != NULL)
*unsecure = ISC_FALSE;
return (result);
}
}
/*%
* Find the next/previous name that has a NSEC record.
* In other words, skip empty database nodes and names that
* have had their NSECs removed because they are obscured by
* a zone cut.
*/
static isc_result_t
next_active(dns_update_log_t *log, dns_zone_t *zone, dns_db_t *db,
dns_dbversion_t *ver, dns_name_t *oldname, dns_name_t *newname,
isc_boolean_t forward)
{
isc_result_t result;
dns_dbiterator_t *dbit = NULL;
isc_boolean_t has_nsec = ISC_FALSE;
unsigned int wraps = 0;
isc_boolean_t secure = dns_db_issecure(db);
CHECK(dns_db_createiterator(db, 0, &dbit));
CHECK(dns_dbiterator_seek(dbit, oldname));
do {
dns_dbnode_t *node = NULL;
if (forward)
result = dns_dbiterator_next(dbit);
else
result = dns_dbiterator_prev(dbit);
if (result == ISC_R_NOMORE) {
/*
* Wrap around.
*/
if (forward)
CHECK(dns_dbiterator_first(dbit));
else
CHECK(dns_dbiterator_last(dbit));
wraps++;
if (wraps == 2) {
update_log(log, zone, ISC_LOG_ERROR,
"secure zone with no NSECs");
result = DNS_R_BADZONE;
goto failure;
}
}
CHECK(dns_dbiterator_current(dbit, &node, newname));
dns_db_detachnode(db, &node);
/*
* The iterator may hold the tree lock, and
* rrset_exists() calls dns_db_findnode() which
* may try to reacquire it. To avoid deadlock
* we must pause the iterator first.
*/
CHECK(dns_dbiterator_pause(dbit));
if (secure) {
CHECK(rrset_exists(db, ver, newname,
dns_rdatatype_nsec, 0, &has_nsec));
} else {
dns_fixedname_t ffound;
dns_name_t *found;
dns_fixedname_init(&ffound);
found = dns_fixedname_name(&ffound);
result = dns_db_find(db, newname, ver,
dns_rdatatype_soa,
DNS_DBFIND_NOWILD, 0, NULL, found,
NULL, NULL);
if (result == ISC_R_SUCCESS ||
result == DNS_R_EMPTYNAME ||
result == DNS_R_NXRRSET ||
result == DNS_R_CNAME ||
(result == DNS_R_DELEGATION &&
dns_name_equal(newname, found))) {
has_nsec = ISC_TRUE;
result = ISC_R_SUCCESS;
} else if (result != DNS_R_NXDOMAIN)
break;
}
} while (! has_nsec);
failure:
if (dbit != NULL)
dns_dbiterator_destroy(&dbit);
return (result);
}
/*%
* Add a NSEC record for "name", recording the change in "diff".
* The existing NSEC is removed.
*/
static isc_result_t
add_nsec(dns_update_log_t *log, dns_zone_t *zone, dns_db_t *db,
dns_dbversion_t *ver, dns_name_t *name, dns_ttl_t nsecttl,
dns_diff_t *diff)
{
isc_result_t result;
dns_dbnode_t *node = NULL;
unsigned char buffer[DNS_NSEC_BUFFERSIZE];
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_difftuple_t *tuple = NULL;
dns_fixedname_t fixedname;
dns_name_t *target;
dns_fixedname_init(&fixedname);
target = dns_fixedname_name(&fixedname);
/*
* Find the successor name, aka NSEC target.
*/
CHECK(next_active(log, zone, db, ver, name, target, ISC_TRUE));
/*
* Create the NSEC RDATA.
*/
CHECK(dns_db_findnode(db, name, ISC_FALSE, &node));
dns_rdata_init(&rdata);
CHECK(dns_nsec_buildrdata(db, ver, node, target, buffer, &rdata));
dns_db_detachnode(db, &node);
/*
* Delete the old NSEC and record the change.
*/
CHECK(delete_if(true_p, db, ver, name, dns_rdatatype_nsec, 0,
NULL, diff));
/*
* Add the new NSEC and record the change.
*/
CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name,
nsecttl, &rdata, &tuple));
CHECK(do_one_tuple(&tuple, db, ver, diff));
INSIST(tuple == NULL);
failure:
if (node != NULL)
dns_db_detachnode(db, &node);
return (result);
}
/*%
* Add a placeholder NSEC record for "name", recording the change in "diff".
*/
static isc_result_t
add_placeholder_nsec(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
dns_diff_t *diff)
{
isc_result_t result;
dns_difftuple_t *tuple = NULL;
isc_region_t r;
unsigned char data[1] = { 0 }; /* The root domain, no bits. */
dns_rdata_t rdata = DNS_RDATA_INIT;
r.base = data;
r.length = sizeof(data);
dns_rdata_fromregion(&rdata, dns_db_class(db), dns_rdatatype_nsec, &r);
CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name, 0,
&rdata, &tuple));
CHECK(do_one_tuple(&tuple, db, ver, diff));
failure:
return (result);
}
static isc_result_t
find_zone_keys(dns_zone_t *zone, dns_db_t *db, dns_dbversion_t *ver,
isc_mem_t *mctx, unsigned int maxkeys,
dst_key_t **keys, unsigned int *nkeys)
{
isc_result_t result;
dns_dbnode_t *node = NULL;
const char *directory = dns_zone_getkeydirectory(zone);
CHECK(dns_db_findnode(db, dns_db_origin(db), ISC_FALSE, &node));
CHECK(dns_dnssec_findzonekeys2(db, ver, node, dns_db_origin(db),
directory, mctx, maxkeys, keys, nkeys));
failure:
if (node != NULL)
dns_db_detachnode(db, &node);
return (result);
}
/*%
* Add RRSIG records for an RRset, recording the change in "diff".
*/
static isc_result_t
add_sigs(dns_update_log_t *log, dns_zone_t *zone, dns_db_t *db,
dns_dbversion_t *ver, dns_name_t *name, dns_rdatatype_t type,
dns_diff_t *diff, dst_key_t **keys, unsigned int nkeys,
isc_stdtime_t inception, isc_stdtime_t expire,
isc_boolean_t check_ksk, isc_boolean_t keyset_kskonly)
{
isc_result_t result;
dns_dbnode_t *node = NULL;
dns_rdataset_t rdataset;
dns_rdata_t sig_rdata = DNS_RDATA_INIT;
isc_buffer_t buffer;
unsigned char data[1024]; /* XXX */
unsigned int i, j;
isc_boolean_t added_sig = ISC_FALSE;
isc_mem_t *mctx = diff->mctx;
dns_rdataset_init(&rdataset);
isc_buffer_init(&buffer, data, sizeof(data));
/* Get the rdataset to sign. */
if (type == dns_rdatatype_nsec3)
CHECK(dns_db_findnsec3node(db, name, ISC_FALSE, &node));
else
CHECK(dns_db_findnode(db, name, ISC_FALSE, &node));
CHECK(dns_db_findrdataset(db, node, ver, type, 0,
(isc_stdtime_t) 0, &rdataset, NULL));
dns_db_detachnode(db, &node);
#define REVOKE(x) ((dst_key_flags(x) & DNS_KEYFLAG_REVOKE) != 0)
#define KSK(x) ((dst_key_flags(x) & DNS_KEYFLAG_KSK) != 0)
#define ALG(x) dst_key_alg(x)
/*
* If we are honoring KSK flags then we need to check that we
* have both KSK and non-KSK keys that are not revoked per
* algorithm.
*/
for (i = 0; i < nkeys; i++) {
isc_boolean_t both = ISC_FALSE;
if (!dst_key_isprivate(keys[i]))
continue;
if (check_ksk && !REVOKE(keys[i])) {
isc_boolean_t have_ksk, have_nonksk;
if (KSK(keys[i])) {
have_ksk = ISC_TRUE;
have_nonksk = ISC_FALSE;
} else {
have_ksk = ISC_FALSE;
have_nonksk = ISC_TRUE;
}
for (j = 0; j < nkeys; j++) {
if (j == i || ALG(keys[i]) != ALG(keys[j]))
continue;
if (REVOKE(keys[j]))
continue;
if (KSK(keys[j]))
have_ksk = ISC_TRUE;
else
have_nonksk = ISC_TRUE;
both = have_ksk && have_nonksk;
if (both)
break;
}
}
if (both) {
if (type == dns_rdatatype_dnskey) {
if (!KSK(keys[i]) && keyset_kskonly)
continue;
} else if (KSK(keys[i]))
continue;
} else if (REVOKE(keys[i]) && type != dns_rdatatype_dnskey)
continue;
/* Calculate the signature, creating a RRSIG RDATA. */
CHECK(dns_dnssec_sign(name, &rdataset, keys[i],
&inception, &expire,
mctx, &buffer, &sig_rdata));
/* Update the database and journal with the RRSIG. */
/* XXX inefficient - will cause dataset merging */
CHECK(update_one_rr(db, ver, diff, DNS_DIFFOP_ADDRESIGN, name,
rdataset.ttl, &sig_rdata));
dns_rdata_reset(&sig_rdata);
isc_buffer_init(&buffer, data, sizeof(data));
added_sig = ISC_TRUE;
}
if (!added_sig) {
update_log(log, zone, ISC_LOG_ERROR,
"found no active private keys, "
"unable to generate any signatures");
result = ISC_R_NOTFOUND;
}
failure:
if (dns_rdataset_isassociated(&rdataset))
dns_rdataset_disassociate(&rdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
return (result);
}
/*
* Delete expired RRsigs and any RRsigs we are about to re-sign.
* See also zone.c:del_sigs().
*/
static isc_result_t
del_keysigs(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
dns_diff_t *diff, dst_key_t **keys, unsigned int nkeys)
{
isc_result_t result;
dns_dbnode_t *node = NULL;
dns_rdataset_t rdataset;
dns_rdata_t rdata = DNS_RDATA_INIT;
unsigned int i;
dns_rdata_rrsig_t rrsig;
isc_boolean_t found;
dns_rdataset_init(&rdataset);
result = dns_db_findnode(db, name, ISC_FALSE, &node);
if (result == ISC_R_NOTFOUND)
return (ISC_R_SUCCESS);
if (result != ISC_R_SUCCESS)
goto failure;
result = dns_db_findrdataset(db, node, ver, dns_rdatatype_rrsig,
dns_rdatatype_dnskey, (isc_stdtime_t) 0,
&rdataset, NULL);
dns_db_detachnode(db, &node);
if (result == ISC_R_NOTFOUND)
return (ISC_R_SUCCESS);
if (result != ISC_R_SUCCESS)
goto failure;
for (result = dns_rdataset_first(&rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(&rdataset)) {
dns_rdataset_current(&rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &rrsig, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
found = ISC_FALSE;
for (i = 0; i < nkeys; i++) {
if (rrsig.keyid == dst_key_id(keys[i])) {
found = ISC_TRUE;
if (!dst_key_isprivate(keys[i])) {
/*
* The re-signing code in zone.c
* will mark this as offline.
* Just skip the record for now.
*/
break;
}
result = update_one_rr(db, ver, diff,
DNS_DIFFOP_DEL, name,
rdataset.ttl, &rdata);
break;
}
}
/*
* If there is not a matching DNSKEY then delete the RRSIG.
*/
if (!found)
result = update_one_rr(db, ver, diff, DNS_DIFFOP_DEL,
name, rdataset.ttl, &rdata);
dns_rdata_reset(&rdata);
if (result != ISC_R_SUCCESS)
break;
}
dns_rdataset_disassociate(&rdataset);
if (result == ISC_R_NOMORE)
result = ISC_R_SUCCESS;
failure:
if (node != NULL)
dns_db_detachnode(db, &node);
return (result);
}
static isc_result_t
add_exposed_sigs(dns_update_log_t *log, dns_zone_t *zone, dns_db_t *db,
dns_dbversion_t *ver, dns_name_t *name, isc_boolean_t cut,
dns_diff_t *diff, dst_key_t **keys, unsigned int nkeys,
isc_stdtime_t inception, isc_stdtime_t expire,
isc_boolean_t check_ksk, isc_boolean_t keyset_kskonly)
{
isc_result_t result;
dns_dbnode_t *node;
dns_rdatasetiter_t *iter;
node = NULL;
result = dns_db_findnode(db, name, ISC_FALSE, &node);
if (result == ISC_R_NOTFOUND)
return (ISC_R_SUCCESS);
if (result != ISC_R_SUCCESS)
return (result);
iter = NULL;
result = dns_db_allrdatasets(db, node, ver,
(isc_stdtime_t) 0, &iter);
if (result != ISC_R_SUCCESS)
goto cleanup_node;
for (result = dns_rdatasetiter_first(iter);
result == ISC_R_SUCCESS;
result = dns_rdatasetiter_next(iter))
{
dns_rdataset_t rdataset;
dns_rdatatype_t type;
isc_boolean_t flag;
dns_rdataset_init(&rdataset);
dns_rdatasetiter_current(iter, &rdataset);
type = rdataset.type;
dns_rdataset_disassociate(&rdataset);
/*
* We don't need to sign unsigned NSEC records at the cut
* as they are handled elsewhere.
*/
if ((type == dns_rdatatype_rrsig) ||
(cut && type != dns_rdatatype_ds))
continue;
result = rrset_exists(db, ver, name, dns_rdatatype_rrsig,
type, &flag);
if (result != ISC_R_SUCCESS)
goto cleanup_iterator;
if (flag)
continue;;
result = add_sigs(log, zone, db, ver, name, type, diff,
keys, nkeys, inception, expire,
check_ksk, keyset_kskonly);
if (result != ISC_R_SUCCESS)
goto cleanup_iterator;
}
if (result == ISC_R_NOMORE)
result = ISC_R_SUCCESS;
cleanup_iterator:
dns_rdatasetiter_destroy(&iter);
cleanup_node:
dns_db_detachnode(db, &node);
return (result);
}
/*%
* Update RRSIG, NSEC and NSEC3 records affected by an update. The original
* update, including the SOA serial update but excluding the RRSIG & NSEC
* changes, is in "diff" and has already been applied to "newver" of "db".
* The database version prior to the update is "oldver".
*
* The necessary RRSIG, NSEC and NSEC3 changes will be applied to "newver"
* and added (as a minimal diff) to "diff".
*
* The RRSIGs generated will be valid for 'sigvalidityinterval' seconds.
*/
isc_result_t
dns_update_signatures(dns_update_log_t *log, dns_zone_t *zone, dns_db_t *db,
dns_dbversion_t *oldver, dns_dbversion_t *newver,
dns_diff_t *diff, isc_uint32_t sigvalidityinterval)
{
isc_result_t result;
dns_difftuple_t *t;
dns_diff_t diffnames;
dns_diff_t affected;
dns_diff_t sig_diff;
dns_diff_t nsec_diff;
dns_diff_t nsec_mindiff;
isc_boolean_t flag, build_nsec, build_nsec3;
dst_key_t *zone_keys[MAXZONEKEYS];
unsigned int nkeys = 0;
unsigned int i;
isc_stdtime_t now, inception, expire;
dns_ttl_t nsecttl;
dns_rdata_soa_t soa;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdataset_t rdataset;
dns_dbnode_t *node = NULL;
isc_boolean_t check_ksk, keyset_kskonly;
isc_boolean_t unsecure;
isc_boolean_t cut;
dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone);
dns_diff_init(diff->mctx, &diffnames);
dns_diff_init(diff->mctx, &affected);
dns_diff_init(diff->mctx, &sig_diff);
sig_diff.resign = dns_zone_getsigresigninginterval(zone);
dns_diff_init(diff->mctx, &nsec_diff);
dns_diff_init(diff->mctx, &nsec_mindiff);
result = find_zone_keys(zone, db, newver, diff->mctx,
MAXZONEKEYS, zone_keys, &nkeys);
if (result != ISC_R_SUCCESS) {
update_log(log, zone, ISC_LOG_ERROR,
"could not get zone keys for secure dynamic update");
goto failure;
}
isc_stdtime_get(&now);
inception = now - 3600; /* Allow for some clock skew. */
expire = now + sigvalidityinterval;
/*
* Do we look at the KSK flag on the DNSKEY to determining which
* keys sign which RRsets? First check the zone option then
* check the keys flags to make sure at least one has a ksk set
* and one doesn't.
*/
check_ksk = ISC_TF((dns_zone_getoptions(zone) &
DNS_ZONEOPT_UPDATECHECKKSK) != 0);
keyset_kskonly = ISC_TF((dns_zone_getoptions(zone) &
DNS_ZONEOPT_DNSKEYKSKONLY) != 0);
/*
* Get the NSEC/NSEC3 TTL from the SOA MINIMUM field.
*/
CHECK(dns_db_findnode(db, dns_db_origin(db), ISC_FALSE, &node));
dns_rdataset_init(&rdataset);
CHECK(dns_db_findrdataset(db, node, newver, dns_rdatatype_soa, 0,
(isc_stdtime_t) 0, &rdataset, NULL));
CHECK(dns_rdataset_first(&rdataset));
dns_rdataset_current(&rdataset, &rdata);
CHECK(dns_rdata_tostruct(&rdata, &soa, NULL));
nsecttl = soa.minimum;
dns_rdataset_disassociate(&rdataset);
dns_db_detachnode(db, &node);
/*
* Find all RRsets directly affected by the update, and
* update their RRSIGs. Also build a list of names affected
* by the update in "diffnames".
*/
CHECK(dns_diff_sort(diff, temp_order));
t = ISC_LIST_HEAD(diff->tuples);
while (t != NULL) {
dns_name_t *name = &t->name;
/* Now "name" is a new, unique name affected by the update. */
CHECK(namelist_append_name(&diffnames, name));
while (t != NULL && dns_name_equal(&t->name, name)) {
dns_rdatatype_t type;
type = t->rdata.type;
/*
* Now "name" and "type" denote a new unique RRset
* affected by the update.
*/
/* Don't sign RRSIGs. */
if (type == dns_rdatatype_rrsig)
goto skip;
/*
* Delete all old RRSIGs covering this type, since they
* are all invalid when the signed RRset has changed.
* We may not be able to recreate all of them - tough.
* Special case changes to the zone's DNSKEY records
* to support offline KSKs.
*/
if (type == dns_rdatatype_dnskey)
del_keysigs(db, newver, name, &sig_diff,
zone_keys, nkeys);
else
CHECK(delete_if(true_p, db, newver, name,
dns_rdatatype_rrsig, type,
NULL, &sig_diff));
/*
* If this RRset is still visible after the update,
* add a new signature for it.
*/
CHECK(rrset_visible(db, newver, name, type, &flag));
if (flag) {
CHECK(add_sigs(log, zone, db, newver, name,
type, &sig_diff, zone_keys,
nkeys, inception, expire,
check_ksk, keyset_kskonly));
}
skip:
/* Skip any other updates to the same RRset. */
while (t != NULL &&
dns_name_equal(&t->name, name) &&
t->rdata.type == type)
{
t = ISC_LIST_NEXT(t, link);
}
}
}
update_log(log, zone, ISC_LOG_DEBUG(3), "updated data signatures");
/* Remove orphaned NSECs and RRSIG NSECs. */
for (t = ISC_LIST_HEAD(diffnames.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
CHECK(non_nsec_rrset_exists(db, newver, &t->name, &flag));
if (! flag) {
CHECK(delete_if(true_p, db, newver, &t->name,
dns_rdatatype_any, 0,
NULL, &sig_diff));
}
}
update_log(log, zone, ISC_LOG_DEBUG(3),
"removed any orphaned NSEC records");
/*
* See if we need to build NSEC or NSEC3 chains.
*/
CHECK(dns_private_chains(db, newver, privatetype, &build_nsec,
&build_nsec3));
if (!build_nsec)
goto update_nsec3;
update_log(log, zone, ISC_LOG_DEBUG(3), "rebuilding NSEC chain");
/*
* When a name is created or deleted, its predecessor needs to
* have its NSEC updated.
*/
for (t = ISC_LIST_HEAD(diffnames.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
isc_boolean_t existed, exists;
dns_fixedname_t fixedname;
dns_name_t *prevname;
dns_fixedname_init(&fixedname);
prevname = dns_fixedname_name(&fixedname);
if (oldver != NULL)
CHECK(name_exists(db, oldver, &t->name, &existed));
else
existed = ISC_FALSE;
CHECK(name_exists(db, newver, &t->name, &exists));
if (exists == existed)
continue;
/*
* Find the predecessor.
* When names become obscured or unobscured in this update
* transaction, we may find the wrong predecessor because
* the NSECs have not yet been updated to reflect the delegation
* change. This should not matter because in this case,
* the correct predecessor is either the delegation node or
* a newly unobscured node, and those nodes are on the
* "affected" list in any case.
*/
CHECK(next_active(log, zone, db, newver,
&t->name, prevname, ISC_FALSE));
CHECK(namelist_append_name(&affected, prevname));
}
/*
* Find names potentially affected by delegation changes
* (obscured by adding an NS or DNAME, or unobscured by
* removing one).
*/
for (t = ISC_LIST_HEAD(diffnames.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
isc_boolean_t ns_existed, dname_existed;
isc_boolean_t ns_exists, dname_exists;
if (oldver != NULL)
CHECK(rrset_exists(db, oldver, &t->name,
dns_rdatatype_ns, 0, &ns_existed));
else
ns_existed = ISC_FALSE;
if (oldver != NULL)
CHECK(rrset_exists(db, oldver, &t->name,
dns_rdatatype_dname, 0,
&dname_existed));
else
dname_existed = ISC_FALSE;
CHECK(rrset_exists(db, newver, &t->name, dns_rdatatype_ns, 0,
&ns_exists));
CHECK(rrset_exists(db, newver, &t->name, dns_rdatatype_dname, 0,
&dname_exists));
if ((ns_exists || dname_exists) == (ns_existed || dname_existed))
continue;
/*
* There was a delegation change. Mark all subdomains
* of t->name as potentially needing a NSEC update.
*/
CHECK(namelist_append_subdomain(db, &t->name, &affected));
}
ISC_LIST_APPENDLIST(affected.tuples, diffnames.tuples, link);
INSIST(ISC_LIST_EMPTY(diffnames.tuples));
CHECK(uniqify_name_list(&affected));
/*
* Determine which names should have NSECs, and delete/create
* NSECs to make it so. We don't know the final NSEC targets yet,
* so we just create placeholder NSECs with arbitrary contents
* to indicate that their respective owner names should be part of
* the NSEC chain.
*/
for (t = ISC_LIST_HEAD(affected.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
isc_boolean_t exists;
dns_name_t *name = &t->name;
CHECK(name_exists(db, newver, name, &exists));
if (! exists)
continue;
CHECK(is_active(db, newver, name, &flag, &cut, NULL));
if (!flag) {
/*
* This name is obscured. Delete any
* existing NSEC record.
*/
CHECK(delete_if(true_p, db, newver, name,
dns_rdatatype_nsec, 0,
NULL, &nsec_diff));
CHECK(delete_if(rrsig_p, db, newver, name,
dns_rdatatype_any, 0, NULL, diff));
} else {
/*
* This name is not obscured. It needs to have a
* NSEC unless it is the at the origin, in which
* case it should already exist if there is a complete
* NSEC chain and if there isn't a complete NSEC chain
* we don't want to add one as that would signal that
* there is a complete NSEC chain.
*/
if (!dns_name_equal(name, dns_db_origin(db))) {
CHECK(rrset_exists(db, newver, name,
dns_rdatatype_nsec, 0,
&flag));
if (!flag)
CHECK(add_placeholder_nsec(db, newver,
name, diff));
}
CHECK(add_exposed_sigs(log, zone, db, newver, name,
cut, &sig_diff, zone_keys, nkeys,
inception, expire, check_ksk,
keyset_kskonly));
}
}
/*
* Now we know which names are part of the NSEC chain.
* Make them all point at their correct targets.
*/
for (t = ISC_LIST_HEAD(affected.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
CHECK(rrset_exists(db, newver, &t->name,
dns_rdatatype_nsec, 0, &flag));
if (flag) {
/*
* There is a NSEC, but we don't know if it is correct.
* Delete it and create a correct one to be sure.
* If the update was unnecessary, the diff minimization
* will take care of eliminating it from the journal,
* IXFRs, etc.
*
* The RRSIG bit should always be set in the NSECs
* we generate, because they will all get RRSIG NSECs.
* (XXX what if the zone keys are missing?).
* Because the RRSIG NSECs have not necessarily been
* created yet, the correctness of the bit mask relies
* on the assumption that NSECs are only created if
* there is other data, and if there is other data,
* there are other RRSIGs.
*/
CHECK(add_nsec(log, zone, db, newver, &t->name,
nsecttl, &nsec_diff));
}
}
/*
* Minimize the set of NSEC updates so that we don't
* have to regenerate the RRSIG NSECs for NSECs that were
* replaced with identical ones.
*/
while ((t = ISC_LIST_HEAD(nsec_diff.tuples)) != NULL) {
ISC_LIST_UNLINK(nsec_diff.tuples, t, link);
dns_diff_appendminimal(&nsec_mindiff, &t);
}
update_log(log, zone, ISC_LOG_DEBUG(3), "signing rebuilt NSEC chain");
/* Update RRSIG NSECs. */
for (t = ISC_LIST_HEAD(nsec_mindiff.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
if (t->op == DNS_DIFFOP_DEL) {
CHECK(delete_if(true_p, db, newver, &t->name,
dns_rdatatype_rrsig, dns_rdatatype_nsec,
NULL, &sig_diff));
} else if (t->op == DNS_DIFFOP_ADD) {
CHECK(add_sigs(log, zone, db, newver, &t->name,
dns_rdatatype_nsec, &sig_diff,
zone_keys, nkeys, inception, expire,
check_ksk, keyset_kskonly));
} else {
INSIST(0);
}
}
update_nsec3:
/* Record our changes for the journal. */
while ((t = ISC_LIST_HEAD(sig_diff.tuples)) != NULL) {
ISC_LIST_UNLINK(sig_diff.tuples, t, link);
dns_diff_appendminimal(diff, &t);
}
while ((t = ISC_LIST_HEAD(nsec_mindiff.tuples)) != NULL) {
ISC_LIST_UNLINK(nsec_mindiff.tuples, t, link);
dns_diff_appendminimal(diff, &t);
}
INSIST(ISC_LIST_EMPTY(sig_diff.tuples));
INSIST(ISC_LIST_EMPTY(nsec_diff.tuples));
INSIST(ISC_LIST_EMPTY(nsec_mindiff.tuples));
if (!build_nsec3) {
update_log(log, zone, ISC_LOG_DEBUG(3),
"no NSEC3 chains to rebuild");
goto failure;
}
update_log(log, zone, ISC_LOG_DEBUG(3), "rebuilding NSEC3 chains");
dns_diff_clear(&diffnames);
dns_diff_clear(&affected);
CHECK(dns_diff_sort(diff, temp_order));
/*
* Find names potentially affected by delegation changes
* (obscured by adding an NS or DNAME, or unobscured by
* removing one).
*/
t = ISC_LIST_HEAD(diff->tuples);
while (t != NULL) {
dns_name_t *name = &t->name;
isc_boolean_t ns_existed, dname_existed;
isc_boolean_t ns_exists, dname_exists;
isc_boolean_t exists, existed;
if (t->rdata.type == dns_rdatatype_nsec ||
t->rdata.type == dns_rdatatype_rrsig) {
t = ISC_LIST_NEXT(t, link);
continue;
}
CHECK(namelist_append_name(&affected, name));
if (oldver != NULL)
CHECK(rrset_exists(db, oldver, name, dns_rdatatype_ns,
0, &ns_existed));
else
ns_existed = ISC_FALSE;
if (oldver != NULL)
CHECK(rrset_exists(db, oldver, name,
dns_rdatatype_dname, 0,
&dname_existed));
else
dname_existed = ISC_FALSE;
CHECK(rrset_exists(db, newver, name, dns_rdatatype_ns, 0,
&ns_exists));
CHECK(rrset_exists(db, newver, name, dns_rdatatype_dname, 0,
&dname_exists));
exists = ns_exists || dname_exists;
existed = ns_existed || dname_existed;
if (exists == existed)
goto nextname;
/*
* There was a delegation change. Mark all subdomains
* of t->name as potentially needing a NSEC3 update.
*/
CHECK(namelist_append_subdomain(db, name, &affected));
nextname:
while (t != NULL && dns_name_equal(&t->name, name))
t = ISC_LIST_NEXT(t, link);
}
for (t = ISC_LIST_HEAD(affected.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link)) {
dns_name_t *name = &t->name;
unsecure = ISC_FALSE; /* Silence compiler warning. */
CHECK(is_active(db, newver, name, &flag, &cut, &unsecure));
if (!flag) {
CHECK(delete_if(rrsig_p, db, newver, name,
dns_rdatatype_any, 0, NULL, diff));
CHECK(dns_nsec3_delnsec3sx(db, newver, name,
privatetype, &nsec_diff));
} else {
CHECK(add_exposed_sigs(log, zone, db, newver, name,
cut, &sig_diff, zone_keys, nkeys,
inception, expire, check_ksk,
keyset_kskonly));
CHECK(dns_nsec3_addnsec3sx(db, newver, name, nsecttl,
unsecure, privatetype,
&nsec_diff));
}
}
/*
* Minimize the set of NSEC3 updates so that we don't
* have to regenerate the RRSIG NSEC3s for NSEC3s that were
* replaced with identical ones.
*/
while ((t = ISC_LIST_HEAD(nsec_diff.tuples)) != NULL) {
ISC_LIST_UNLINK(nsec_diff.tuples, t, link);
dns_diff_appendminimal(&nsec_mindiff, &t);
}
update_log(log, zone, ISC_LOG_DEBUG(3),
"signing rebuilt NSEC3 chain");
/* Update RRSIG NSEC3s. */
for (t = ISC_LIST_HEAD(nsec_mindiff.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
if (t->op == DNS_DIFFOP_DEL) {
CHECK(delete_if(true_p, db, newver, &t->name,
dns_rdatatype_rrsig,
dns_rdatatype_nsec3,
NULL, &sig_diff));
} else if (t->op == DNS_DIFFOP_ADD) {
CHECK(add_sigs(log, zone, db, newver, &t->name,
dns_rdatatype_nsec3,
&sig_diff, zone_keys, nkeys,
inception, expire, check_ksk,
keyset_kskonly));
} else {
INSIST(0);
}
}
/* Record our changes for the journal. */
while ((t = ISC_LIST_HEAD(sig_diff.tuples)) != NULL) {
ISC_LIST_UNLINK(sig_diff.tuples, t, link);
dns_diff_appendminimal(diff, &t);
}
while ((t = ISC_LIST_HEAD(nsec_mindiff.tuples)) != NULL) {
ISC_LIST_UNLINK(nsec_mindiff.tuples, t, link);
dns_diff_appendminimal(diff, &t);
}
INSIST(ISC_LIST_EMPTY(sig_diff.tuples));
INSIST(ISC_LIST_EMPTY(nsec_diff.tuples));
INSIST(ISC_LIST_EMPTY(nsec_mindiff.tuples));
failure:
dns_diff_clear(&sig_diff);
dns_diff_clear(&nsec_diff);
dns_diff_clear(&nsec_mindiff);
dns_diff_clear(&affected);
dns_diff_clear(&diffnames);
for (i = 0; i < nkeys; i++)
dst_key_free(&zone_keys[i]);
return (result);
}
isc_uint32_t
dns_update_soaserial(isc_uint32_t serial, dns_updatemethod_t method) {
isc_stdtime_t now;
if (method == dns_updatemethod_unixtime) {
isc_stdtime_get(&now);
if (now != 0 && isc_serial_gt(now, serial))
return (now);
}
/* RFC1982 */
serial = (serial + 1) & 0xFFFFFFFF;
if (serial == 0)
serial = 1;
return (serial);
}