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2691. [func] dnssec-signzone: retain the existing NSEC or NSEC3

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chain when re-signing a previously-signed zone.
			Use -u to modify NSEC3 parameters or switch
			between NSEC and NSEC3. [RT #20304]
This commit is contained in:
Evan Hunt
2009-09-25 06:47:50 +00:00
parent ff850b81c8
commit fb596cc9af
4 changed files with 182 additions and 33 deletions
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5
CHANGES
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@@ -1,3 +1,8 @@
2691. [func] dnssec-signzone: retain the existing NSEC or NSEC3
chain when re-signing a previously-signed zone.
Use -u to modify NSEC3 parameters or switch
between NSEC and NSEC3. [RT #20304]
2690. [bug] win32: fix isc_thread_key_getspecific() prototype.
[RT #20315]

175
bin/dnssec/dnssec-signzone.c
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@@ -29,7 +29,7 @@
* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: dnssec-signzone.c,v 1.234 2009/09/24 04:36:28 each Exp $ */
/* $Id: dnssec-signzone.c,v 1.235 2009/09/25 06:47:50 each Exp $ */
/*! \file */
@@ -147,6 +147,10 @@ static dns_dbiterator_t *gdbiter; /* The database iterator */
static dns_rdataclass_t gclass; /* The class */
static dns_name_t *gorigin; /* The database origin */
static int nsec3flags = 0;
static dns_iterations_t nsec3iter = 100U;
static unsigned char saltbuf[255];
static unsigned char *salt = saltbuf;
static size_t salt_length = 0;
static isc_task_t *master = NULL;
static unsigned int ntasks = 0;
static isc_boolean_t shuttingdown = ISC_FALSE, finished = ISC_FALSE;
@@ -161,6 +165,7 @@ static unsigned int serialformat = SOA_SERIAL_KEEP;
static unsigned int hash_length = 0;
static isc_boolean_t unknownalg = ISC_FALSE;
static isc_boolean_t disable_zone_check = ISC_FALSE;
static isc_boolean_t update_chain = ISC_FALSE;
static isc_boolean_t set_keyttl = ISC_FALSE;
static dns_ttl_t keyttl;
static isc_boolean_t smartsign = ISC_FALSE;
@@ -2001,8 +2006,8 @@ nsecify(void) {
type = rdataset.type;
covers = rdataset.covers;
dns_rdataset_disassociate(&rdataset);
result = dns_db_deleterdataset(gdb, node, gversion, type,
covers);
result = dns_db_deleterdataset(gdb, node, gversion,
type, covers);
check_result(result,
"dns_db_deleterdataset(nsec3param/rrsig)");
}
@@ -2019,6 +2024,7 @@ nsecify(void) {
result = dns_dbiterator_current(dbiter, &node, name);
check_dns_dbiterator_current(result);
/*
* Delete any NSEC3PARAM records at the apex.
*/
@@ -2354,6 +2360,7 @@ nsec3ify(unsigned int hashalg, unsigned int iterations,
result = dns_dbiterator_current(dbiter, &node, name);
check_dns_dbiterator_current(result);
/*
* Delete any NSEC records at the apex.
*/
@@ -2366,7 +2373,12 @@ nsec3ify(unsigned int hashalg, unsigned int iterations,
type = rdataset.type;
covers = rdataset.covers;
dns_rdataset_disassociate(&rdataset);
if (type == dns_rdatatype_nsec || covers == dns_rdatatype_nsec) {
if (type == dns_rdatatype_nsec ||
covers == dns_rdatatype_nsec) {
if (!update_chain)
fatal("Zone contains NSEC records. Use -u "
"to update to NSEC3.");
result = dns_db_deleterdataset(gdb, node, gversion,
type, covers);
check_result(result,
@@ -3012,6 +3024,100 @@ warnifallksk(dns_db_t *db) {
}
}
static void
set_nsec3params(isc_boolean_t update_chain, isc_boolean_t set_salt,
isc_boolean_t set_optout, isc_boolean_t set_iter)
{
isc_result_t result;
dns_dbversion_t *ver = NULL;
dns_dbnode_t *node = NULL;
dns_rdataset_t rdataset;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdata_nsec3_t nsec3;
dns_fixedname_t fname;
dns_name_t *hashname;
unsigned char orig_salt[256];
size_t orig_saltlen;
dns_hash_t orig_hash;
isc_uint16_t orig_iter;
dns_db_currentversion(gdb, &ver);
orig_saltlen = sizeof(orig_salt);
result = dns_db_getnsec3parameters(gdb, ver, &orig_hash, NULL,
&orig_iter, orig_salt,
&orig_saltlen);
if (result != ISC_R_SUCCESS)
goto cleanup;
nsec_datatype = dns_rdatatype_nsec3;
if (!update_chain && set_salt) {
if (salt_length != orig_saltlen ||
memcmp(saltbuf, orig_salt, salt_length) != 0)
fatal("An NSEC3 chain exists with a different salt. "
"Use -u to update it.");
} else if (!set_salt) {
salt_length = orig_saltlen;
memcpy(saltbuf, orig_salt, orig_saltlen);
salt = saltbuf;
}
if (!update_chain && set_iter) {
if (nsec3iter != orig_iter)
fatal("An NSEC3 chain exists with different "
"iterations. Use -u to update it.");
} else if (!set_iter)
nsec3iter = orig_iter;
/*
* Find an NSEC3 record to get the current OPTOUT value.
* (This assumes all NSEC3 records agree.)
*/
dns_fixedname_init(&fname);
hashname = dns_fixedname_name(&fname);
result = dns_nsec3_hashname(&fname, NULL, NULL,
gorigin, gorigin, dns_hash_sha1,
orig_iter, orig_salt, orig_saltlen);
check_result(result, "dns_nsec3_hashname");
result = dns_db_findnsec3node(gdb, hashname, ISC_FALSE, &node);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_rdataset_init(&rdataset);
result = dns_db_findrdataset(gdb, node, ver, dns_rdatatype_nsec3,
0, 0, &rdataset, NULL);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_rdataset_first(&rdataset);
check_result(result, "dns_rdataset_first");
dns_rdataset_current(&rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &nsec3, NULL);
check_result(result, "dns_rdata_tostruct");
if (!update_chain && set_optout) {
if (nsec3flags != nsec3.flags)
fatal("An NSEC3 chain exists with%s OPTOUT. "
"Use -u -%s to %s it.",
OPTOUT(nsec3.flags) ? "" : "out",
OPTOUT(nsec3.flags) ? "AA" : "A",
OPTOUT(nsec3.flags) ? "clear" : "set");
} else if (!set_optout)
nsec3flags = nsec3.flags;
dns_rdata_freestruct(&nsec3);
cleanup:
if (dns_rdataset_isassociated(&rdataset))
dns_rdataset_disassociate(&rdataset);
if (node != NULL)
dns_db_detachnode(gdb, &node);
dns_db_closeversion(gdb, &ver, ISC_FALSE);
}
static void
writeset(const char *prefix, dns_rdatatype_t type) {
char *filename;
@@ -3177,9 +3283,9 @@ usage(void) {
fprintf(stderr, "Version: %s\n", VERSION);
fprintf(stderr, "Options: (default value in parenthesis) \n");
fprintf(stderr, "\t-S:\tsmart signing: automatically finds key\n"
"\t\tfiles for the zone and determines they are to\n"
"\t\tbe used\n");
fprintf(stderr, "\t-S:\tsmart signing: automatically finds key files\n"
"\t\tfor the zone and determines how they are to "
"be used\n");
fprintf(stderr, "\t-K directory:\n");
fprintf(stderr, "\t\tdirectory to find key files (.)\n");
fprintf(stderr, "\t-d directory:\n");
@@ -3221,6 +3327,8 @@ usage(void) {
fprintf(stderr, "\t-T TTL:\tTTL for newly added DNSKEYs");
fprintf(stderr, "\t-t:\t");
fprintf(stderr, "print statistics\n");
fprintf(stderr, "\t-u:\t");
fprintf(stderr, "update or replace an existing NSEC/NSEC3 chain\n");
fprintf(stderr, "\t-C:\tgenerate a keyset file, for compatibility\n"
"\t\twith older versions of dnssec-signzone -g\n");
fprintf(stderr, "\t-n ncpus (number of cpus present)\n");
@@ -3293,14 +3401,14 @@ main(int argc, char *argv[]) {
isc_task_t **tasks = NULL;
isc_buffer_t b;
int len;
unsigned int iterations = 100U;
const unsigned char *salt = NULL;
size_t salt_length = 0;
unsigned char saltbuf[255];
hashlist_t hashlist;
isc_boolean_t make_keyset = ISC_FALSE;
#define CMDLINE_FLAGS "3:AaCc:Dd:e:f:FghH:i:I:j:K:k:l:m:n:N:o:O:pPr:s:ST:tUv:z"
isc_boolean_t set_salt = ISC_FALSE;
isc_boolean_t set_optout = ISC_FALSE;
isc_boolean_t set_iter = ISC_FALSE;
#define CMDLINE_FLAGS \
"3:AaCc:Dd:e:f:FghH:i:I:j:K:k:l:m:n:N:o:O:pPr:s:ST:tuUv:z"
/*
* Process memory debugging argument first.
@@ -3340,7 +3448,9 @@ main(int argc, char *argv[]) {
while ((ch = isc_commandline_parse(argc, argv, CMDLINE_FLAGS)) != -1) {
switch (ch) {
case '3':
if (strcmp(isc_commandline_argument, "-")) {
set_salt = ISC_TRUE;
nsec_datatype = dns_rdatatype_nsec3;
if (strcmp(isc_commandline_argument, "-") != 0) {
isc_buffer_t target;
char *sarg;
@@ -3350,17 +3460,16 @@ main(int argc, char *argv[]) {
result = isc_hex_decodestring(sarg, &target);
check_result(result,
"isc_hex_decodestring(salt)");
salt = saltbuf;
salt_length = isc_buffer_usedlength(&target);
} else {
salt = saltbuf;
salt_length = 0;
}
nsec_datatype = dns_rdatatype_nsec3;
break;
case 'A':
nsec3flags |= DNS_NSEC3FLAG_OPTOUT;
set_optout = ISC_TRUE;
if (OPTOUT(nsec3flags))
nsec3flags &= ~DNS_NSEC3FLAG_OPTOUT;
else
nsec3flags |= DNS_NSEC3FLAG_OPTOUT;
break;
case 'a':
@@ -3398,11 +3507,11 @@ main(int argc, char *argv[]) {
break;
case 'H':
iterations = strtoul(isc_commandline_argument,
&endp, 0);
set_iter = ISC_TRUE;
nsec3iter = strtoul(isc_commandline_argument, &endp, 0);
if (*endp != '\0')
fatal("iterations must be numeric");
if (iterations > 0xffffU)
if (nsec3iter > 0xffffU)
fatal("iterations too big");
break;
@@ -3504,6 +3613,10 @@ main(int argc, char *argv[]) {
unknownalg = ISC_TRUE;
break;
case 'u':
update_chain = ISC_TRUE;
break;
case 'v':
endp = NULL;
verbose = strtol(isc_commandline_argument, &endp, 0);
@@ -3622,7 +3735,8 @@ main(int argc, char *argv[]) {
else if (strcasecmp(serialformatstr, "unixtime") == 0)
serialformat = SOA_SERIAL_UNIXTIME;
else
fatal("unknown soa serial format: %s\n", serialformatstr);
fatal("unknown soa serial format: %s\n",
serialformatstr);
}
result = dns_master_stylecreate(&dsstyle, DNS_STYLEFLAG_NO_TTL,
@@ -3639,6 +3753,15 @@ main(int argc, char *argv[]) {
if (!set_keyttl)
keyttl = soa_ttl;
/*
* Check for any existing NSEC3 parameters in the zone,
* and use them as defaults if -u was not specified.
*/
if (update_chain && !set_optout && !set_iter && !set_salt)
nsec_datatype = dns_rdatatype_nsec;
else
set_nsec3params(update_chain, set_salt, set_optout, set_iter);
if (IS_NSEC3) {
isc_boolean_t answer;
hash_length = dns_nsec3_hashlength(dns_hash_sha1);
@@ -3769,7 +3892,7 @@ main(int argc, char *argv[]) {
unsigned int max;
result = dns_nsec3_maxiterations(gdb, NULL, mctx, &max);
check_result(result, "dns_nsec3_maxiterations()");
if (iterations > max)
if (nsec3iter > max)
fatal("NSEC3 iterations too big for weakest DNSKEY "
"strength. Maximum iterations allowed %u.", max);
}
@@ -3794,7 +3917,7 @@ main(int argc, char *argv[]) {
}
if (IS_NSEC3)
nsec3ify(dns_hash_sha1, iterations, salt, salt_length,
nsec3ify(dns_hash_sha1, nsec3iter, salt, salt_length,
&hashlist);
else
nsecify();

23
bin/dnssec/dnssec-signzone.docbook
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@@ -18,7 +18,7 @@
- PERFORMANCE OF THIS SOFTWARE.
-->
<!-- $Id: dnssec-signzone.docbook,v 1.36 2009/09/02 06:29:00 each Exp $ -->
<!-- $Id: dnssec-signzone.docbook,v 1.37 2009/09/25 06:47:50 each Exp $ -->
<refentry id="man.dnssec-signzone">
<refentryinfo>
<date>June 05, 2009</date>
@@ -80,6 +80,7 @@
<arg><option>-s <replaceable class="parameter">start-time</replaceable></option></arg>
<arg><option>-T <replaceable class="parameter">ttl</replaceable></option></arg>
<arg><option>-t</option></arg>
<arg><option>-u</option></arg>
<arg><option>-v <replaceable class="parameter">level</replaceable></option></arg>
<arg><option>-z</option></arg>
<arg><option>-3 <replaceable class="parameter">salt</replaceable></option></arg>
@@ -515,6 +516,20 @@
</listitem>
</varlistentry>
<varlistentry>
<term>-u</term>
<listitem>
<para>
Update NSEC/NSEC3 chain when re-signing a previously signed
zone. With this option, a zone signed with NSEC can be
switched to NSEC3, or a zone signed with NSEC3 can
be switch to NSEC or to NSEC3 with different parameters.
Without this option, <command>dnssec-signzone</command> will
retain the existing chain when re-signing.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>-v <replaceable class="parameter">level</replaceable></term>
<listitem>
@@ -562,6 +577,12 @@
NSEC3 records and do not generate NSEC3 records for insecure
delegations.
</para>
<para>
Using this option twice (i.e., <option>-AA</option>)
turns the OPTOUT flag off for all records. This is useful
when using the <option>-u</option> option to modify an NSEC3
chain which previously had OPTOUT set.
</para>
</listitem>
</varlistentry>

12
bin/tests/system/dnssec/ns3/sign.sh
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@@ -15,7 +15,7 @@
# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.
# $Id: sign.sh,v 1.27 2009/06/04 02:56:47 tbox Exp $
# $Id: sign.sh,v 1.28 2009/09/25 06:47:50 each Exp $
SYSTEMTESTTOP=../..
. $SYSTEMTESTTOP/conf.sh
@@ -213,12 +213,12 @@ cat $infile $keyname.key >$zonefile
$SIGNER -P -r $RANDFILE -o $zone $zonefile > /dev/null
mv $zonefile.signed $zonefile
$SIGNER -P -3 - -r $RANDFILE -o $zone $zonefile > /dev/null
$SIGNER -P -u3 - -r $RANDFILE -o $zone $zonefile > /dev/null
mv $zonefile.signed $zonefile
$SIGNER -P -3 AAAA -r $RANDFILE -o $zone $zonefile > /dev/null
$SIGNER -P -u3 AAAA -r $RANDFILE -o $zone $zonefile > /dev/null
mv $zonefile.signed $zonefile
$SIGNER -P -3 BBBB -r $RANDFILE -o $zone $zonefile > /dev/null
$SIGNER -P -u3 BBBB -r $RANDFILE -o $zone $zonefile > /dev/null
mv $zonefile.signed $zonefile
$SIGNER -P -3 CCCC -r $RANDFILE -o $zone $zonefile > /dev/null
$SIGNER -P -u3 CCCC -r $RANDFILE -o $zone $zonefile > /dev/null
mv $zonefile.signed $zonefile
$SIGNER -P -3 DDDD -r $RANDFILE -o $zone $zonefile > /dev/null
$SIGNER -P -u3 DDDD -r $RANDFILE -o $zone $zonefile > /dev/null