dnssec-signzone.c revision 9c3531d72aeaad6c5f01efe6a1c82023e1379e4d
/*
* Portions Copyright (C) 1999, 2000 Internet Software Consortium.
* Portions Copyright (C) 1995-2000 by Network Associates, Inc.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM AND
* NETWORK ASSOCIATES DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE CONSORTIUM OR NETWORK
* ASSOCIATES BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: dnssec-signzone.c,v 1.81 2000/06/22 21:49:04 tale Exp $ */
#include <config.h>
#include <stdlib.h>
#include <isc/commandline.h>
#include <isc/entropy.h>
#include <isc/mem.h>
#include <isc/string.h>
#include <isc/util.h>
#include <dns/db.h>
#include <dns/dbiterator.h>
#include <dns/dnssec.h>
#include <dns/keyvalues.h>
#include <dns/log.h>
#include <dns/nxt.h>
#include <dns/rdata.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/rdatastruct.h>
#include <dns/rdatatype.h>
#include <dns/result.h>
#include <dns/secalg.h>
#include <dns/time.h>
#include <dst/dst.h>
#include <dst/result.h>
#include "dnssectool.h"
const char *program = "dnssec-signzone";
int verbose;
/*#define USE_ZONESTATUS*/
#define BUFSIZE 2048
typedef struct signer_key_struct signer_key_t;
typedef struct signer_array_struct signer_array_t;
struct signer_key_struct {
dst_key_t *key;
isc_boolean_t isdefault;
ISC_LINK(signer_key_t) link;
};
struct signer_array_struct {
unsigned char array[BUFSIZE];
ISC_LINK(signer_array_t) link;
};
static ISC_LIST(signer_key_t) keylist;
static isc_stdtime_t starttime = 0, endtime = 0, now;
static int cycle = -1;
static isc_boolean_t tryverify = ISC_FALSE;
static isc_mem_t *mctx = NULL;
static isc_entropy_t *ectx = NULL;
static dns_ttl_t zonettl;
static inline void
set_bit(unsigned char *array, unsigned int index, unsigned int bit) {
unsigned int shift, mask;
shift = 7 - (index % 8);
mask = 1 << shift;
if (bit != 0)
array[index / 8] |= mask;
else
array[index / 8] &= (~mask & 0xFF);
}
static void
signwithkey(dns_name_t *name, dns_rdataset_t *rdataset, dns_rdata_t *rdata,
dst_key_t *key, isc_buffer_t *b)
{
isc_result_t result;
dns_rdata_init(rdata);
result = dns_dnssec_sign(name, rdataset, key, &starttime, &endtime,
mctx, b, rdata);
isc_entropy_stopcallbacksources(ectx);
if (result != ISC_R_SUCCESS)
fatal("key '%s/%s/%d' failed to sign data: %s",
nametostr(dst_key_name(key)), algtostr(dst_key_alg(key)),
dst_key_id(key), isc_result_totext(result));
if (tryverify) {
result = dns_dnssec_verify(name, rdataset, key,
ISC_TRUE, mctx, rdata);
if (result == ISC_R_SUCCESS)
vbprintf(3, "\tsignature verified\n");
else
vbprintf(3, "\tsignature failed to verify\n");
}
}
static inline isc_boolean_t
issigningkey(signer_key_t *key) {
return (key->isdefault);
}
static inline isc_boolean_t
iszonekey(signer_key_t *key, dns_db_t *db) {
return (ISC_TF(dns_name_equal(dst_key_name(key->key),
dns_db_origin(db)) &&
dst_key_iszonekey(key->key)));
}
/*
* Finds the key that generated a SIG, if possible. First look at the keys
* that we've loaded already, and then see if there's a key on disk.
*/
static signer_key_t *
keythatsigned(dns_rdata_sig_t *sig) {
isc_result_t result;
dst_key_t *pubkey = NULL, *privkey = NULL;
signer_key_t *key;
key = ISC_LIST_HEAD(keylist);
while (key != NULL) {
if (sig->keyid == dst_key_id(key->key) &&
sig->algorithm == dst_key_alg(key->key) &&
dns_name_equal(&sig->signer, dst_key_name(key->key)))
return key;
key = ISC_LIST_NEXT(key, link);
}
result = dst_key_fromfile(&sig->signer, sig->keyid, sig->algorithm,
DST_TYPE_PUBLIC, NULL, mctx, &pubkey);
if (result != ISC_R_SUCCESS)
return (NULL);
key = isc_mem_get(mctx, sizeof(signer_key_t));
if (key == NULL)
fatal("out of memory");
result = dst_key_fromfile(&sig->signer, sig->keyid, sig->algorithm,
DST_TYPE_PRIVATE, NULL, mctx, &privkey);
if (result == ISC_R_SUCCESS) {
key->key = privkey;
dst_key_free(&pubkey);
}
else
key->key = pubkey;
key->isdefault = ISC_FALSE;
ISC_LIST_APPEND(keylist, key, link);
return key;
}
/*
* Check to see if we expect to find a key at this name. If we see a SIG
* and can't find the signing key that we expect to find, we drop the sig.
* I'm not sure if this is completely correct, but it seems to work.
*/
static isc_boolean_t
expecttofindkey(dns_name_t *name, dns_db_t *db, dns_dbversion_t *version) {
unsigned int options = DNS_DBFIND_NOWILD;
dns_fixedname_t fname;
isc_result_t result;
dns_fixedname_init(&fname);
result = dns_db_find(db, name, version, dns_rdatatype_key, options,
0, NULL, dns_fixedname_name(&fname), NULL, NULL);
switch (result) {
case ISC_R_SUCCESS:
case DNS_R_NXDOMAIN:
case DNS_R_NXRRSET:
return ISC_TRUE;
case DNS_R_DELEGATION:
case DNS_R_CNAME:
case DNS_R_DNAME:
return ISC_FALSE;
default:
fatal("failure looking for '%s KEY' in database: %s",
nametostr(name), isc_result_totext(result));
return ISC_FALSE; /* removes a warning */
}
}
static inline isc_boolean_t
setverifies(dns_name_t *name, dns_rdataset_t *set, signer_key_t *key,
dns_rdata_t *sig)
{
isc_result_t result;
result = dns_dnssec_verify(name, set, key->key, ISC_FALSE, mctx, sig);
return (ISC_TF(result == ISC_R_SUCCESS));
}
#define allocbufferandrdata \
isc_buffer_t b; \
trdata = isc_mem_get(mctx, sizeof(dns_rdata_t)); \
tdata = isc_mem_get(mctx, sizeof(signer_array_t)); \
ISC_LIST_APPEND(arraylist, tdata, link); \
if (trdata == NULL || tdata == NULL) \
fatal("out of memory"); \
isc_buffer_init(&b, tdata->array, sizeof(tdata->array));
/*
* Signs a set. Goes through contortions to decide if each SIG should
* be dropped or retained, and then determines if any new SIGs need to
* be generated.
*/
static void
signset(dns_db_t *db, dns_dbversion_t *version, dns_dbnode_t *node,
dns_name_t *name, dns_rdataset_t *set)
{
dns_rdatalist_t siglist;
dns_rdataset_t sigset, oldsigset;
dns_rdata_t oldsigrdata;
dns_rdata_t *trdata;
dns_rdata_sig_t sig;
signer_key_t *key;
isc_result_t result;
isc_boolean_t notsigned = ISC_TRUE, nosigs = ISC_FALSE;
isc_boolean_t wassignedby[256], nowsignedby[256];
signer_array_t *tdata;
ISC_LIST(signer_array_t) arraylist;
int i;
ISC_LIST_INIT(siglist.rdata);
ISC_LIST_INIT(arraylist);
for (i = 0; i < 256; i++)
wassignedby[i] = nowsignedby[i] = ISC_FALSE;
dns_rdataset_init(&oldsigset);
result = dns_db_findrdataset(db, node, version, dns_rdatatype_sig,
set->type, 0, &oldsigset, NULL);
if (result == ISC_R_NOTFOUND) {
result = ISC_R_SUCCESS;
nosigs = ISC_TRUE;
}
if (result != ISC_R_SUCCESS)
fatal("failed while looking for '%s SIG %s': %s",
nametostr(name), typetostr(set->type),
isc_result_totext(result));
vbprintf(1, "%s/%s:\n", nametostr(name), typetostr(set->type));
if (!nosigs) {
result = dns_rdataset_first(&oldsigset);
while (result == ISC_R_SUCCESS) {
isc_boolean_t expired, future;
isc_boolean_t keep = ISC_FALSE, resign = ISC_FALSE;
dns_rdataset_current(&oldsigset, &oldsigrdata);
result = dns_rdata_tostruct(&oldsigrdata, &sig, mctx);
check_result(result, "dns_rdata_tostruct");
expired = ISC_TF(now + cycle > sig.timeexpire);
future = ISC_TF(now < sig.timesigned);
key = keythatsigned(&sig);
if (sig.timesigned > sig.timeexpire) {
/* sig is dropped and not replaced */
vbprintf(2, "\tsig by %s/%s/%d dropped - "
"invalid validity period\n",
nametostr(&sig.signer),
algtostr(sig.algorithm),
sig.keyid);
}
else if (key == NULL && !future &&
expecttofindkey(&sig.signer, db, version))
{
/* sig is dropped and not replaced */
vbprintf(2, "\tsig by %s/%s/%d dropped - "
"private key not found\n",
nametostr(&sig.signer),
algtostr(sig.algorithm),
sig.keyid);
}
else if (key == NULL || future) {
vbprintf(2, "\tsig by %s/%s/%d %s - "
"key not found\n",
expired ? "retained" : "dropped",
nametostr(&sig.signer),
algtostr(sig.algorithm),
sig.keyid);
if (!expired)
keep = ISC_TRUE;
}
else if (issigningkey(key)) {
if (!expired &&
setverifies(name, set, key, &oldsigrdata))
{
vbprintf(2,
"\tsig by %s/%s/%d retained\n",
nametostr(&sig.signer),
algtostr(sig.algorithm),
sig.keyid);
keep = ISC_TRUE;
wassignedby[sig.algorithm] = ISC_TRUE;
}
else {
vbprintf(2,
"\tsig by %s/%s/%d dropped - "
"%s\n",
nametostr(&sig.signer),
algtostr(sig.algorithm),
sig.keyid,
expired ? "expired" :
"failed to verify");
wassignedby[sig.algorithm] = ISC_TRUE;
resign = ISC_TRUE;
}
}
else if (iszonekey(key, db)) {
if (!expired &&
setverifies(name, set, key, &oldsigrdata))
{
vbprintf(2,
"\tsig by %s/%s/%d retained\n",
nametostr(&sig.signer),
algtostr(sig.algorithm),
sig.keyid);
keep = ISC_TRUE;
wassignedby[sig.algorithm] = ISC_TRUE;
nowsignedby[sig.algorithm] = ISC_TRUE;
}
else {
vbprintf(2,
"\tsig by %s/%s/%d "
"dropped - %s\n",
nametostr(&sig.signer),
algtostr(sig.algorithm),
sig.keyid,
expired ? "expired" :
"failed to verify");
wassignedby[sig.algorithm] = ISC_TRUE;
if (dst_key_isprivate(key->key))
resign = ISC_TRUE;
}
}
else if (!expired) {
vbprintf(2, "\tsig by %s/%s/%d retained\n",
nametostr(&sig.signer),
algtostr(sig.algorithm),
sig.keyid);
keep = ISC_TRUE;
}
else {
vbprintf(2, "\tsig by %s/%s/%d expired\n",
nametostr(&sig.signer),
algtostr(sig.algorithm),
sig.keyid);
}
if (keep) {
allocbufferandrdata;
result = dns_rdata_fromstruct(trdata,
set->rdclass,
dns_rdatatype_sig,
&sig, &b);
nowsignedby[sig.algorithm] = ISC_TRUE;
ISC_LIST_APPEND(siglist.rdata, trdata, link);
}
else if (resign) {
allocbufferandrdata;
vbprintf(1, "\tresigning with key %s/%s/%d\n",
nametostr(dst_key_name(key->key)),
algtostr(dst_key_alg(key->key)),
dst_key_id(key->key));
signwithkey(name, set, trdata, key->key, &b);
nowsignedby[sig.algorithm] = ISC_TRUE;
ISC_LIST_APPEND(siglist.rdata, trdata, link);
}
dns_rdata_freestruct(&sig);
result = dns_rdataset_next(&oldsigset);
}
if (result == ISC_R_NOMORE)
result = ISC_R_SUCCESS;
check_result(result, "dns_db_dns_rdataset_first()/next()");
dns_rdataset_disassociate(&oldsigset);
}
for (i = 0; i < 256; i++)
if (wassignedby[i] != 0) {
notsigned = ISC_FALSE;
break;
}
key = ISC_LIST_HEAD(keylist);
while (key != NULL) {
unsigned int alg = dst_key_alg(key->key);
if (key->isdefault &&
(notsigned || (wassignedby[alg] && !nowsignedby[alg])))
{
allocbufferandrdata;
vbprintf(1, "\tsigning with key %s/%s/%d\n",
nametostr(dst_key_name(key->key)),
algtostr(dst_key_alg(key->key)),
dst_key_id(key->key));
signwithkey(name, set, trdata, key->key, &b);
ISC_LIST_APPEND(siglist.rdata, trdata, link);
}
key = ISC_LIST_NEXT(key, link);
}
if (!ISC_LIST_EMPTY(siglist.rdata)) {
siglist.rdclass = set->rdclass;
siglist.type = dns_rdatatype_sig;
siglist.covers = set->type;
if (endtime - starttime < set->ttl)
siglist.ttl = endtime - starttime;
else
siglist.ttl = set->ttl;
dns_rdataset_init(&sigset);
result = dns_rdatalist_tordataset(&siglist, &sigset);
check_result(result, "dns_rdatalist_tordataset");
result = dns_db_addrdataset(db, node, version, 0, &sigset,
0, NULL);
if (result == DNS_R_UNCHANGED)
result = ISC_R_SUCCESS;
check_result(result, "dns_db_addrdataset");
dns_rdataset_disassociate(&sigset);
}
else if (!nosigs) {
#if 0
/*
* If this is compiled in, running a signed set through the
* signer with no private keys causes DNS_R_BADDB to occur
* later. This is bad.
*/
result = dns_db_deleterdataset(db, node, version,
dns_rdatatype_sig, set->type);
if (result == ISC_R_NOTFOUND)
result = ISC_R_SUCCESS;
check_result(result, "dns_db_deleterdataset");
#endif
fatal("File is currently signed but no private keys were "
"found. This won't work.");
}
trdata = ISC_LIST_HEAD(siglist.rdata);
while (trdata != NULL) {
dns_rdata_t *next = ISC_LIST_NEXT(trdata, link);
isc_mem_put(mctx, trdata, sizeof(dns_rdata_t));
trdata = next;
}
tdata = ISC_LIST_HEAD(arraylist);
while (tdata != NULL) {
signer_array_t *next = ISC_LIST_NEXT(tdata, link);
isc_mem_put(mctx, tdata, sizeof(signer_array_t));
tdata = next;
}
}
#ifndef USE_ZONESTATUS
/* Determine if a KEY set contains a null key */
static isc_boolean_t
hasnullkey(dns_rdataset_t *rdataset) {
isc_result_t result;
dns_rdata_t rdata;
isc_boolean_t found = ISC_FALSE;
result = dns_rdataset_first(rdataset);
while (result == ISC_R_SUCCESS) {
dst_key_t *key = NULL;
dns_rdataset_current(rdataset, &rdata);
result = dns_dnssec_keyfromrdata(dns_rootname,
&rdata, mctx, &key);
if (result != ISC_R_SUCCESS)
fatal("could not convert KEY into internal format");
if (dst_key_isnullkey(key))
found = ISC_TRUE;
dst_key_free(&key);
if (found == ISC_TRUE)
return (ISC_TRUE);
result = dns_rdataset_next(rdataset);
}
if (result != ISC_R_NOMORE)
fatal("failure looking for null keys");
return (ISC_FALSE);
}
#endif
/*
* Looks for signatures of the zone keys by the parent, and imports them
* if found.
*/
static void
importparentsig(dns_db_t *db, dns_dbversion_t *version, dns_dbnode_t *node,
dns_name_t *name, dns_rdataset_t *set)
{
unsigned char filename[256];
isc_buffer_t b;
isc_region_t r;
dns_db_t *newdb = NULL;
dns_dbnode_t *newnode = NULL;
dns_rdataset_t newset, sigset;
dns_rdata_t rdata, newrdata;
isc_result_t result;
isc_buffer_init(&b, filename, sizeof(filename) - 10);
result = dns_name_totext(name, ISC_FALSE, &b);
check_result(result, "dns_name_totext()");
isc_buffer_usedregion(&b, &r);
strcpy((char *)r.base + r.length, "signedkey");
result = dns_db_create(mctx, "rbt", name, dns_dbtype_zone,
dns_db_class(db), 0, NULL, &newdb);
check_result(result, "dns_db_create()");
result = dns_db_load(newdb, (char *)filename);
if (result != ISC_R_SUCCESS)
goto failure;
result = dns_db_findnode(newdb, name, ISC_FALSE, &newnode);
if (result != ISC_R_SUCCESS)
goto failure;
dns_rdataset_init(&newset);
dns_rdataset_init(&sigset);
result = dns_db_findrdataset(newdb, newnode, NULL, dns_rdatatype_key,
0, 0, &newset, &sigset);
if (result != ISC_R_SUCCESS)
goto failure;
if (dns_rdataset_count(set) != dns_rdataset_count(&newset))
goto failure;
dns_rdata_init(&rdata);
dns_rdata_init(&newrdata);
result = dns_rdataset_first(set);
check_result(result, "dns_rdataset_first()");
for (; result == ISC_R_SUCCESS; result = dns_rdataset_next(set)) {
dns_rdataset_current(set, &rdata);
result = dns_rdataset_first(&newset);
check_result(result, "dns_rdataset_first()");
for (;
result == ISC_R_SUCCESS;
result = dns_rdataset_next(&newset))
{
dns_rdataset_current(&newset, &newrdata);
if (dns_rdata_compare(&rdata, &newrdata) == 0)
break;
}
if (result != ISC_R_SUCCESS)
break;
}
if (result != ISC_R_NOMORE)
goto failure;
vbprintf(2, "found the parent's signature of our zone key\n");
result = dns_db_addrdataset(db, node, version, 0, &sigset, 0, NULL);
check_result(result, "dns_db_addrdataset");
dns_rdataset_disassociate(&newset);
dns_rdataset_disassociate(&sigset);
failure:
if (newnode != NULL)
dns_db_detachnode(newdb, &newnode);
if (newdb != NULL)
dns_db_detach(&newdb);
}
/*
* Looks for our signatures of child keys. If present, inform the caller,
* who will set the zone status (KEY) bit in the NXT record.
*/
static isc_boolean_t
haschildkey(dns_db_t *db, dns_name_t *name) {
unsigned char filename[256];
isc_buffer_t b;
isc_region_t r;
dns_db_t *newdb = NULL;
dns_dbnode_t *newnode = NULL;
dns_rdataset_t set, sigset;
dns_rdata_t sigrdata;
isc_result_t result;
isc_boolean_t found = ISC_FALSE;
dns_rdata_sig_t sig;
signer_key_t *key;
dns_rdataset_init(&set);
dns_rdataset_init(&sigset);
isc_buffer_init(&b, filename, sizeof(filename) - 10);
result = dns_name_totext(name, ISC_FALSE, &b);
check_result(result, "dns_name_totext()");
isc_buffer_usedregion(&b, &r);
strcpy((char *)r.base + r.length, "signedkey");
result = dns_db_create(mctx, "rbt", name, dns_dbtype_zone,
dns_db_class(db), 0, NULL, &newdb);
check_result(result, "dns_db_create()");
result = dns_db_load(newdb, (char *)filename);
if (result != ISC_R_SUCCESS)
goto failure;
result = dns_db_findnode(newdb, name, ISC_FALSE, &newnode);
if (result != ISC_R_SUCCESS)
goto failure;
result = dns_db_findrdataset(newdb, newnode, NULL, dns_rdatatype_key,
0, 0, &set, &sigset);
if (result != ISC_R_SUCCESS)
goto failure;
if (!dns_rdataset_isassociated(&set) ||
!dns_rdataset_isassociated(&sigset))
goto failure;
result = dns_rdataset_first(&sigset);
check_result(result, "dns_rdataset_first()");
dns_rdata_init(&sigrdata);
for (; result == ISC_R_SUCCESS; result = dns_rdataset_next(&sigset)) {
dns_rdataset_current(&sigset, &sigrdata);
result = dns_rdata_tostruct(&sigrdata, &sig, mctx);
if (result != ISC_R_SUCCESS)
goto failure;
key = keythatsigned(&sig);
dns_rdata_freestruct(&sig);
if (key == NULL)
goto failure;
result = dns_dnssec_verify(name, &set, key->key,
ISC_FALSE, mctx, &sigrdata);
if (result == ISC_R_SUCCESS) {
found = ISC_TRUE;
break;
}
}
failure:
if (dns_rdataset_isassociated(&set))
dns_rdataset_disassociate(&set);
if (dns_rdataset_isassociated(&sigset))
dns_rdataset_disassociate(&sigset);
if (newnode != NULL)
dns_db_detachnode(newdb, &newnode);
if (newdb != NULL)
dns_db_detach(&newdb);
return (found);
}
/*
* Signs all records at a name. This mostly just signs each set individually,
* but also adds the SIG bit to any NXTs generated earlier, deals with
* parent/child KEY signatures, and handles other exceptional cases.
*/
static void
signname(dns_db_t *db, dns_dbversion_t *version, dns_dbnode_t *node,
dns_name_t *name)
{
isc_result_t result;
dns_rdata_t rdata;
dns_rdataset_t rdataset;
dns_rdatasetiter_t *rdsiter;
isc_boolean_t isdelegation = ISC_FALSE;
isc_boolean_t childkey = ISC_FALSE;
static int warnwild = 0;
isc_boolean_t atorigin;
if (dns_name_iswildcard(name)) {
if (warnwild++ == 0) {
fprintf(stderr, "%s: warning: BIND 9 doesn't properly "
"handle wildcards in secure zones:\n",
program);
fprintf(stderr, "\t- wildcard nonexistence proof is "
"not generated by the server\n");
fprintf(stderr, "\t- wildcard nonexistence proof is "
"not required by the resolver\n");
}
fprintf(stderr, "%s: warning: wildcard name seen: %s\n",
program, nametostr(name));
}
atorigin = dns_name_equal(name, dns_db_origin(db));
if (!atorigin) {
dns_rdataset_t nsset;
dns_rdataset_init(&nsset);
result = dns_db_findrdataset(db, node, version,
dns_rdatatype_ns, 0, 0, &nsset,
NULL);
/* Is this a delegation point? */
if (result == ISC_R_SUCCESS) {
isdelegation = ISC_TRUE;
dns_rdataset_disassociate(&nsset);
}
}
dns_rdataset_init(&rdataset);
rdsiter = NULL;
result = dns_db_allrdatasets(db, node, version, 0, &rdsiter);
check_result(result, "dns_db_allrdatasets()");
result = dns_rdatasetiter_first(rdsiter);
while (result == ISC_R_SUCCESS) {
dns_rdatasetiter_current(rdsiter, &rdataset);
/* If this is a SIG set, skip it. */
if (rdataset.type == dns_rdatatype_sig)
goto skip;
/*
* If this is a KEY set at the apex, look for a signedkey file.
*/
if (rdataset.type == dns_rdatatype_key && atorigin) {
importparentsig(db, version, node, name, &rdataset);
goto skip;
}
/*
* If this name is a delegation point, skip all records
* except an NXT set, unless we're using null keys, in
* which case we need to check for a null key and add one
* if it's not present.
*/
if (isdelegation) {
switch (rdataset.type) {
case dns_rdatatype_nxt:
childkey = haschildkey(db, name);
break;
#ifndef USE_ZONESTATUS
case dns_rdatatype_key:
if (hasnullkey(&rdataset))
break;
goto skip;
#endif
default:
goto skip;
}
}
/*
* There probably should be a dns_nxtsetbit, but it can get
* complicated if we need to extend the length of the
* bit set. In this case, since the NXT bit is set and
* SIG < NXT and KEY < NXT, the easy way works.
*/
if (rdataset.type == dns_rdatatype_nxt) {
unsigned char *nxt_bits;
dns_name_t nxtname;
isc_region_t r, r2;
unsigned char keydata[4];
dst_key_t *dstkey;
isc_buffer_t b;
result = dns_rdataset_first(&rdataset);
check_result(result, "dns_rdataset_first()");
dns_rdataset_current(&rdataset, &rdata);
dns_rdata_toregion(&rdata, &r);
dns_name_init(&nxtname, NULL);
dns_name_fromregion(&nxtname, &r);
dns_name_toregion(&nxtname, &r2);
nxt_bits = r.base + r2.length;
set_bit(nxt_bits, dns_rdatatype_sig, 1);
#ifdef USE_ZONESTATUS
if (isdelegation && childkey) {
set_bit(nxt_bits, dns_rdatatype_key, 1);
vbprintf(2, "found a child key for %s, "
"setting KEY bit in NXT\n",
nametostr(name));
}
#else
if (isdelegation && !childkey) {
dns_rdataset_t keyset;
dns_rdatalist_t keyrdatalist;
dns_rdata_t keyrdata;
dns_rdataset_init(&keyset);
result = dns_db_findrdataset(db, node, version,
dns_rdatatype_key,
0, 0, &keyset,
NULL);
if (result == ISC_R_SUCCESS &&
hasnullkey(&keyset))
goto alreadyhavenullkey;
if (result == ISC_R_NOTFOUND)
result = ISC_R_SUCCESS;
if (result != ISC_R_SUCCESS)
fatal("failure looking for null key "
"at '%s': %s", nametostr(name),
isc_result_totext(result));
if (dns_rdataset_isassociated(&keyset))
dns_rdataset_disassociate(&keyset);
vbprintf(2, "no child key for %s, "
"adding null key\n",
nametostr(name));
dns_rdatalist_init(&keyrdatalist);
dstkey = NULL;
result = dst_key_generate(name, DNS_KEYALG_DSA,
0, 0,
DNS_KEYTYPE_NOKEY |
DNS_KEYOWNER_ZONE,
DNS_KEYPROTO_DNSSEC,
mctx, &dstkey);
if (result != ISC_R_SUCCESS)
fatal("failed to generate null key");
isc_buffer_init(&b, keydata, sizeof keydata);
result = dst_key_todns(dstkey, &b);
dst_key_free(&dstkey);
isc_buffer_usedregion(&b, &r);
dns_rdata_fromregion(&keyrdata,
rdataset.rdclass,
dns_rdatatype_key, &r);
ISC_LIST_APPEND(keyrdatalist.rdata, &keyrdata,
link);
keyrdatalist.rdclass = rdataset.rdclass;
keyrdatalist.type = dns_rdatatype_key;
keyrdatalist.covers = 0;
keyrdatalist.ttl = rdataset.ttl;
result = dns_rdatalist_tordataset(&keyrdatalist,
&keyset);
check_result(result,
"dns_rdatalist_tordataset");
dns_db_addrdataset(db, node, version, 0,
&keyset, DNS_DBADD_MERGE,
NULL);
set_bit(nxt_bits, dns_rdatatype_key, 1);
signset(db, version, node, name, &keyset);
alreadyhavenullkey:
dns_rdataset_disassociate(&keyset);
}
#endif
}
signset(db, version, node, name, &rdataset);
skip:
dns_rdataset_disassociate(&rdataset);
result = dns_rdatasetiter_next(rdsiter);
}
if (result != ISC_R_NOMORE)
fatal("rdataset iteration for name '%s' failed: %s",
nametostr(name), isc_result_totext(result));
dns_rdatasetiter_destroy(&rdsiter);
}
static inline isc_boolean_t
active_node(dns_db_t *db, dns_dbversion_t *version, dns_dbnode_t *node) {
dns_rdatasetiter_t *rdsiter;
isc_boolean_t active = ISC_FALSE;
isc_result_t result;
dns_rdataset_t rdataset;
dns_rdataset_init(&rdataset);
rdsiter = NULL;
result = dns_db_allrdatasets(db, node, version, 0, &rdsiter);
check_result(result, "dns_db_allrdatasets()");
result = dns_rdatasetiter_first(rdsiter);
while (result == ISC_R_SUCCESS) {
dns_rdatasetiter_current(rdsiter, &rdataset);
if (rdataset.type != dns_rdatatype_nxt)
active = ISC_TRUE;
dns_rdataset_disassociate(&rdataset);
if (!active)
result = dns_rdatasetiter_next(rdsiter);
else
result = ISC_R_NOMORE;
}
if (result != ISC_R_NOMORE)
fatal("rdataset iteration failed: %s",
isc_result_totext(result));
dns_rdatasetiter_destroy(&rdsiter);
if (!active) {
/*
* Make sure there is no NXT record for this node.
*/
result = dns_db_deleterdataset(db, node, version,
dns_rdatatype_nxt, 0);
if (result == DNS_R_UNCHANGED)
result = ISC_R_SUCCESS;
check_result(result, "dns_db_deleterdataset");
}
return (active);
}
static inline isc_result_t
next_active(dns_db_t *db, dns_dbversion_t *version, dns_dbiterator_t *dbiter,
dns_name_t *name, dns_dbnode_t **nodep)
{
isc_result_t result;
isc_boolean_t active;
do {
active = ISC_FALSE;
result = dns_dbiterator_current(dbiter, nodep, name);
if (result == ISC_R_SUCCESS) {
active = active_node(db, version, *nodep);
if (!active) {
dns_db_detachnode(db, nodep);
result = dns_dbiterator_next(dbiter);
}
}
} while (result == ISC_R_SUCCESS && !active);
return (result);
}
static inline isc_result_t
next_nonglue(dns_db_t *db, dns_dbversion_t *version, dns_dbiterator_t *dbiter,
dns_name_t *name, dns_dbnode_t **nodep, dns_name_t *origin,
dns_name_t *lastcut)
{
isc_result_t result;
do {
result = next_active(db, version, dbiter, name, nodep);
if (result == ISC_R_SUCCESS) {
if (dns_name_issubdomain(name, origin) &&
(lastcut == NULL ||
!dns_name_issubdomain(name, lastcut)))
return (ISC_R_SUCCESS);
dns_db_detachnode(db, nodep);
result = dns_dbiterator_next(dbiter);
}
} while (result == ISC_R_SUCCESS);
return (result);
}
/*
* Extracts the zone minimum TTL from the SOA.
*/
static dns_ttl_t
minimumttl(dns_db_t *db, dns_dbversion_t *version) {
dns_rdataset_t soaset;
dns_name_t *origin;
dns_fixedname_t fname;
dns_name_t *name;
dns_rdata_t soarr;
dns_rdata_soa_t soa;
isc_result_t result;
dns_ttl_t ttl;
origin = dns_db_origin(db);
dns_fixedname_init(&fname);
name = dns_fixedname_name(&fname);
dns_rdataset_init(&soaset);
result = dns_db_find(db, origin, version, dns_rdatatype_soa,
0, 0, NULL, name, &soaset, NULL);
if (result != ISC_R_SUCCESS)
fatal("failed to find '%s SOA' in the zone: %s",
nametostr(name), isc_result_totext(result));
result = dns_rdataset_first(&soaset);
check_result(result, "dns_rdataset_first()");
dns_rdataset_current(&soaset, &soarr);
result = dns_rdata_tostruct(&soarr, &soa, mctx);
check_result(result, "dns_rdataset_tostruct()");
ttl = soa.minimum;
dns_rdata_freestruct(&soa);
dns_rdataset_disassociate(&soaset);
return (ttl);
}
/*
* Generates NXTs and SIGs for each non-glue name in the zone.
*/
static void
signzone(dns_db_t *db, dns_dbversion_t *version) {
isc_result_t result, nxtresult;
dns_dbnode_t *node, *nextnode, *curnode;
dns_fixedname_t fname, fnextname, fcurname;
dns_name_t *name, *nextname, *target, *curname, *lastcut;
dns_dbiterator_t *dbiter;
dns_name_t *origin;
zonettl = minimumttl(db, version);
dns_fixedname_init(&fname);
name = dns_fixedname_name(&fname);
dns_fixedname_init(&fnextname);
nextname = dns_fixedname_name(&fnextname);
dns_fixedname_init(&fcurname);
curname = dns_fixedname_name(&fcurname);
origin = dns_db_origin(db);
lastcut = NULL;
dbiter = NULL;
result = dns_db_createiterator(db, ISC_FALSE, &dbiter);
check_result(result, "dns_db_createiterator()");
result = dns_dbiterator_first(dbiter);
node = NULL;
dns_name_clone(origin, name);
result = next_nonglue(db, version, dbiter, name, &node, origin,
lastcut);
while (result == ISC_R_SUCCESS) {
nextnode = NULL;
curnode = NULL;
dns_dbiterator_current(dbiter, &curnode, curname);
if (!dns_name_equal(name, dns_db_origin(db))) {
dns_rdatasetiter_t *rdsiter = NULL;
dns_rdataset_t set;
dns_rdataset_init(&set);
result = dns_db_allrdatasets(db, curnode, version,
0, &rdsiter);
check_result(result, "dns_db_allrdatasets");
result = dns_rdatasetiter_first(rdsiter);
while (result == ISC_R_SUCCESS) {
dns_rdatasetiter_current(rdsiter, &set);
if (set.type == dns_rdatatype_ns) {
dns_rdataset_disassociate(&set);
break;
}
dns_rdataset_disassociate(&set);
result = dns_rdatasetiter_next(rdsiter);
}
if (result != ISC_R_SUCCESS && result != ISC_R_NOMORE)
fatal("rdataset iteration failed: %s",
isc_result_totext(result));
if (result == ISC_R_SUCCESS) {
if (lastcut != NULL)
dns_name_free(lastcut, mctx);
else {
lastcut = isc_mem_get(mctx,
sizeof(dns_name_t));
if (lastcut == NULL)
fatal("out of memory");
}
dns_name_init(lastcut, NULL);
result = dns_name_dup(curname, mctx, lastcut);
check_result(result, "dns_name_dup()");
}
dns_rdatasetiter_destroy(&rdsiter);
}
result = dns_dbiterator_next(dbiter);
if (result == ISC_R_SUCCESS)
result = next_nonglue(db, version, dbiter, nextname,
&nextnode, origin, lastcut);
if (result == ISC_R_SUCCESS)
target = nextname;
else if (result == ISC_R_NOMORE)
target = origin;
else {
target = NULL; /* Make compiler happy. */
fatal("iterating through the database failed: %s",
isc_result_totext(result));
}
nxtresult = dns_buildnxt(db, version, node, target, zonettl);
check_result(nxtresult, "dns_buildnxt()");
signname(db, version, node, curname);
dns_db_detachnode(db, &node);
dns_db_detachnode(db, &curnode);
node = nextnode;
}
if (result != ISC_R_NOMORE)
fatal("iterating through the database failed: %s",
isc_result_totext(result));
if (lastcut != NULL) {
dns_name_free(lastcut, mctx);
isc_mem_put(mctx, lastcut, sizeof(dns_name_t));
}
dns_dbiterator_destroy(&dbiter);
}
/*
* Load the zone file from disk
*/
static void
loadzone(char *file, char *origin, dns_db_t **db) {
isc_buffer_t b, b2;
unsigned char namedata[1024];
int len;
dns_name_t name;
isc_result_t result;
len = strlen(origin);
isc_buffer_init(&b, origin, len);
isc_buffer_add(&b, len);
isc_buffer_init(&b2, namedata, sizeof(namedata));
dns_name_init(&name, NULL);
result = dns_name_fromtext(&name, &b, dns_rootname, ISC_FALSE, &b2);
if (result != ISC_R_SUCCESS)
fatal("failed converting name '%s' to dns format: %s",
origin, isc_result_totext(result));
result = dns_db_create(mctx, "rbt", &name, dns_dbtype_zone,
dns_rdataclass_in, 0, NULL, db);
check_result(result, "dns_db_create()");
result = dns_db_load(*db, file);
if (result != ISC_R_SUCCESS)
fatal("failed loading zone from '%s': %s",
file, isc_result_totext(result));
}
/*
* Finds all public zone keys in the zone, and attempts to load the
* private keys from disk.
*/
static void
loadzonekeys(dns_db_t *db) {
dns_name_t *origin;
dns_dbnode_t *node;
dns_dbversion_t *currentversion;
isc_result_t result;
dst_key_t *keys[20];
unsigned int nkeys, i;
origin = dns_db_origin(db);
currentversion = NULL;
dns_db_currentversion(db, &currentversion);
node = NULL;
result = dns_db_findnode(db, origin, ISC_FALSE, &node);
if (result != ISC_R_SUCCESS)
fatal("failed to find the zone's origin: %s",
isc_result_totext(result));
result = dns_dnssec_findzonekeys(db, currentversion, node, origin, mctx,
20, keys, &nkeys);
if (result == ISC_R_NOTFOUND)
result = ISC_R_SUCCESS;
if (result != ISC_R_SUCCESS)
fatal("failed to find the zone keys: %s",
isc_result_totext(result));
for (i = 0; i < nkeys; i++) {
signer_key_t *key;
key = isc_mem_get(mctx, sizeof(signer_key_t));
if (key == NULL)
fatal("out of memory");
key->key = keys[i];
key->isdefault = ISC_FALSE;
ISC_LIST_APPEND(keylist, key, link);
}
dns_db_detachnode(db, &node);
dns_db_closeversion(db, &currentversion, ISC_FALSE);
}
static isc_stdtime_t
strtotime(char *str, isc_int64_t now, isc_int64_t base) {
isc_int64_t val, offset;
isc_result_t result;
char *endp;
if (str[0] == '+') {
offset = strtol(str + 1, &endp, 0);
if (*endp != '\0')
fatal("time value %s is invalid", str);
val = base + offset;
} else if (strncmp(str, "now+", 4) == 0) {
offset = strtol(str + 4, &endp, 0);
if (*endp != '\0')
fatal("time value %s is invalid", str);
val = now + offset;
} else {
result = dns_time64_fromtext(str, &val);
if (result != ISC_R_SUCCESS)
fatal("time %s must be numeric", str);
}
return ((isc_stdtime_t) val);
}
static void
usage(void) {
fprintf(stderr, "Usage:\n");
fprintf(stderr, "\t%s [options] zonefile [keys]\n", program);
fprintf(stderr, "\n");
fprintf(stderr, "Options: (default value in parenthesis) \n");
fprintf(stderr, "\t-s YYYYMMDDHHMMSS|+offset:\n");
fprintf(stderr, "\t\tSIG start time - absolute|offset (now)\n");
fprintf(stderr, "\t-e YYYYMMDDHHMMSS|+offset|\"now\"+offset]:\n");
fprintf(stderr, "\t\tSIG end time - absolute|from start|from now "
"(now + 30 days)\n");
fprintf(stderr, "\t-c ttl:\n");
fprintf(stderr, "\t\tcycle period - regenerate "
"if < cycle from end ( (end-start)/4 )\n");
fprintf(stderr, "\t-v level:\n");
fprintf(stderr, "\t\tverbose level (0)\n");
fprintf(stderr, "\t-o origin:\n");
fprintf(stderr, "\t\tzone origin (name of zonefile)\n");
fprintf(stderr, "\t-f outfile:\n");
fprintf(stderr, "\t\tfile the signed zone is written in "
"(zonefile + .signed)\n");
fprintf(stderr, "\t-a\n");
fprintf(stderr, "\t\tverify generated signatures\n");
fprintf(stderr, "\t-p\n");
fprintf(stderr, "\t\tuse pseudorandom data (faster but less secure)\n");
fprintf(stderr, "\t-r randomdev:\n");
fprintf(stderr, "\t\ta file containing random data\n");
fprintf(stderr, "\n");
fprintf(stderr, "Signing Keys: ");
fprintf(stderr, "(default: all zone keys that have private keys)\n");
fprintf(stderr, "\tkeyfile (Kname+alg+id)\n");
exit(0);
}
int
main(int argc, char *argv[]) {
int i, ch;
char *startstr = NULL, *endstr = NULL;
char *origin = NULL, *file = NULL, *output = NULL;
char *randomfile = NULL;
char *endp;
dns_db_t *db;
dns_dbversion_t *version;
signer_key_t *key;
isc_result_t result;
isc_log_t *log = NULL;
isc_boolean_t pseudorandom = ISC_FALSE;
unsigned int eflags;
isc_boolean_t free_output = ISC_FALSE;
result = isc_mem_create(0, 0, &mctx);
if (result != ISC_R_SUCCESS)
fatal("out of memory");
dns_result_register();
while ((ch = isc_commandline_parse(argc, argv, "s:e:c:v:o:f:ahpr:"))
!= -1) {
switch (ch) {
case 's':
startstr = isc_commandline_argument;
break;
case 'e':
endstr = isc_commandline_argument;
break;
case 'c':
endp = NULL;
cycle = strtol(isc_commandline_argument, &endp, 0);
if (*endp != '\0' || cycle < 0)
fatal("cycle period must be numeric and "
"positive");
break;
case 'p':
pseudorandom = ISC_TRUE;
break;
case 'r':
randomfile = isc_commandline_argument;
break;
case 'v':
endp = NULL;
verbose = strtol(isc_commandline_argument, &endp, 0);
if (*endp != '\0')
fatal("verbose level must be numeric");
break;
case 'o':
origin = isc_commandline_argument;
break;
case 'f':
output = isc_commandline_argument;
break;
case 'a':
tryverify = ISC_TRUE;
break;
case 'h':
default:
usage();
}
}
setup_entropy(mctx, randomfile, &ectx);
eflags = ISC_ENTROPY_BLOCKING;
if (!pseudorandom)
eflags |= ISC_ENTROPY_GOODONLY;
result = dst_lib_init(mctx, ectx, eflags);
if (result != ISC_R_SUCCESS)
fatal("could not initialize dst");
isc_stdtime_get(&now);
if (startstr != NULL)
starttime = strtotime(startstr, now, now);
else
starttime = now;
if (endstr != NULL)
endtime = strtotime(endstr, now, starttime);
else
endtime = starttime + (30 * 24 * 60 * 60);
if (cycle == -1)
cycle = (endtime - starttime) / 4;
setup_logging(verbose, mctx, &log);
argc -= isc_commandline_index;
argv += isc_commandline_index;
if (argc < 1)
usage();
file = argv[0];
argc -= 1;
argv += 1;
if (output == NULL) {
free_output = ISC_TRUE;
output = isc_mem_allocate(mctx,
strlen(file) + strlen(".signed") + 1);
if (output == NULL)
fatal("out of memory");
sprintf(output, "%s.signed", file);
}
if (origin == NULL)
origin = file;
db = NULL;
loadzone(file, origin, &db);
ISC_LIST_INIT(keylist);
loadzonekeys(db);
if (argc == 0) {
signer_key_t *key;
key = ISC_LIST_HEAD(keylist);
while (key != NULL) {
key->isdefault = ISC_TRUE;
key = ISC_LIST_NEXT(key, link);
}
}
else {
for (i = 0; i < argc; i++) {
dst_key_t *newkey = NULL;
result = dst_key_fromnamedfile(argv[i],
DST_TYPE_PRIVATE,
mctx, &newkey);
if (result != ISC_R_SUCCESS)
usage();
key = ISC_LIST_HEAD(keylist);
while (key != NULL) {
dst_key_t *dkey = key->key;
if (dst_key_id(dkey) == dst_key_id(newkey) &&
dst_key_alg(dkey) == dst_key_alg(newkey) &&
dns_name_equal(dst_key_name(dkey),
dst_key_name(newkey)))
{
key->isdefault = ISC_TRUE;
if (!dst_key_isprivate(dkey))
fatal("cannot sign zone with "
"non-private key %s",
argv[i]);
break;
}
key = ISC_LIST_NEXT(key, link);
}
if (key == NULL) {
key = isc_mem_get(mctx, sizeof(signer_key_t));
if (key == NULL)
fatal("out of memory");
key->key = newkey;
key->isdefault = ISC_TRUE;
ISC_LIST_APPEND(keylist, key, link);
}
else
dst_key_free(&newkey);
}
}
version = NULL;
result = dns_db_newversion(db, &version);
check_result(result, "dns_db_newversion()");
signzone(db, version);
/*
* Should we update the SOA serial?
*/
result = dns_db_dump(db, version, output);
if (result != ISC_R_SUCCESS)
fatal("failed to write new database to '%s': %s",
output, isc_result_totext(result));
dns_db_closeversion(db, &version, ISC_TRUE);
dns_db_detach(&db);
while (!ISC_LIST_EMPTY(keylist)) {
key = ISC_LIST_HEAD(keylist);
ISC_LIST_UNLINK(keylist, key, link);
dst_key_free(&key->key);
isc_mem_put(mctx, key, sizeof(signer_key_t));
}
if (free_output)
isc_mem_free(mctx, output);
if (log != NULL)
isc_log_destroy(&log);
dst_lib_destroy();
cleanup_entropy(&ectx);
if (verbose > 10)
isc_mem_stats(mctx, stdout);
isc_mem_destroy(&mctx);
return (0);
}