/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include <config.h>
#include <inttypes.h>
#include <stdbool.h>
#include <isc/buffer.h>
#include <isc/entropy.h>
#include <isc/md5.h>
#include <isc/mem.h>
#include <isc/print.h>
#include <isc/string.h>
#include <isc/util.h>
#include <pk11/site.h>
#include <dns/dnssec.h>
#include <dns/fixedname.h>
#include <dns/keyvalues.h>
#include <dns/log.h>
#include <dns/message.h>
#include <dns/name.h>
#include <dns/rdata.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdatastruct.h>
#include <dns/result.h>
#include <dns/tkey.h>
#include <dns/tsig.h>
#include <dst/dst.h>
#include <dst/gssapi.h>
#include "dst_internal.h"
#define TEMP_BUFFER_SZ 8192
#define TKEY_RANDOM_AMOUNT 16
#ifdef PKCS11CRYPTO
#include <pk11/pk11.h>
#endif
#define RETERR(x) do { \
result = (x); \
if (result != ISC_R_SUCCESS) \
goto failure; \
} while (0)
static void
tkey_log(const char *fmt, ...) ISC_FORMAT_PRINTF(1, 2);
static void
tkey_log(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
isc_log_vwrite(dns_lctx, DNS_LOGCATEGORY_GENERAL,
DNS_LOGMODULE_REQUEST, ISC_LOG_DEBUG(4), fmt, ap);
va_end(ap);
}
static void
dumpmessage(dns_message_t *msg) {
isc_buffer_t outbuf;
unsigned char *output;
int len = TEMP_BUFFER_SZ;
isc_result_t result;
for (;;) {
output = isc_mem_get(msg->mctx, len);
if (output == NULL)
return;
isc_buffer_init(&outbuf, output, len);
result = dns_message_totext(msg, &dns_master_style_debug,
0, &outbuf);
if (result == ISC_R_NOSPACE) {
isc_mem_put(msg->mctx, output, len);
len *= 2;
continue;
}
if (result == ISC_R_SUCCESS)
tkey_log("%.*s",
(int)isc_buffer_usedlength(&outbuf),
(char *)isc_buffer_base(&outbuf));
else
tkey_log("Warning: dns_message_totext: %s",
dns_result_totext(result));
break;
}
if (output != NULL)
isc_mem_put(msg->mctx, output, len);
}
isc_result_t
dns_tkeyctx_create(isc_mem_t *mctx, isc_entropy_t *ectx, dns_tkeyctx_t **tctxp)
{
dns_tkeyctx_t *tctx;
REQUIRE(mctx != NULL);
REQUIRE(ectx != NULL);
REQUIRE(tctxp != NULL && *tctxp == NULL);
tctx = isc_mem_get(mctx, sizeof(dns_tkeyctx_t));
if (tctx == NULL)
return (ISC_R_NOMEMORY);
tctx->mctx = NULL;
isc_mem_attach(mctx, &tctx->mctx);
tctx->ectx = NULL;
isc_entropy_attach(ectx, &tctx->ectx);
tctx->dhkey = NULL;
tctx->domain = NULL;
tctx->gsscred = NULL;
tctx->gssapi_keytab = NULL;
*tctxp = tctx;
return (ISC_R_SUCCESS);
}
void
dns_tkeyctx_destroy(dns_tkeyctx_t **tctxp) {
isc_mem_t *mctx;
dns_tkeyctx_t *tctx;
REQUIRE(tctxp != NULL && *tctxp != NULL);
tctx = *tctxp;
mctx = tctx->mctx;
if (tctx->dhkey != NULL)
dst_key_free(&tctx->dhkey);
if (tctx->domain != NULL) {
if (dns_name_dynamic(tctx->domain))
dns_name_free(tctx->domain, mctx);
isc_mem_put(mctx, tctx->domain, sizeof(dns_name_t));
}
if (tctx->gssapi_keytab != NULL) {
isc_mem_free(mctx, tctx->gssapi_keytab);
}
if (tctx->gsscred != NULL)
dst_gssapi_releasecred(&tctx->gsscred);
isc_entropy_detach(&tctx->ectx);
isc_mem_put(mctx, tctx, sizeof(dns_tkeyctx_t));
isc_mem_detach(&mctx);
*tctxp = NULL;
}
static isc_result_t
add_rdata_to_list(dns_message_t *msg, dns_name_t *name, dns_rdata_t *rdata,
uint32_t ttl, dns_namelist_t *namelist)
{
isc_result_t result;
isc_region_t r, newr;
dns_rdata_t *newrdata = NULL;
dns_name_t *newname = NULL;
dns_rdatalist_t *newlist = NULL;
dns_rdataset_t *newset = NULL;
isc_buffer_t *tmprdatabuf = NULL;
RETERR(dns_message_gettemprdata(msg, &newrdata));
dns_rdata_toregion(rdata, &r);
RETERR(isc_buffer_allocate(msg->mctx, &tmprdatabuf, r.length));
isc_buffer_availableregion(tmprdatabuf, &newr);
memmove(newr.base, r.base, r.length);
dns_rdata_fromregion(newrdata, rdata->rdclass, rdata->type, &newr);
dns_message_takebuffer(msg, &tmprdatabuf);
RETERR(dns_message_gettempname(msg, &newname));
dns_name_init(newname, NULL);
RETERR(dns_name_dup(name, msg->mctx, newname));
RETERR(dns_message_gettemprdatalist(msg, &newlist));
newlist->rdclass = newrdata->rdclass;
newlist->type = newrdata->type;
newlist->ttl = ttl;
ISC_LIST_APPEND(newlist->rdata, newrdata, link);
RETERR(dns_message_gettemprdataset(msg, &newset));
RETERR(dns_rdatalist_tordataset(newlist, newset));
ISC_LIST_INIT(newname->list);
ISC_LIST_APPEND(newname->list, newset, link);
ISC_LIST_APPEND(*namelist, newname, link);
return (ISC_R_SUCCESS);
failure:
if (newrdata != NULL) {
if (ISC_LINK_LINKED(newrdata, link)) {
INSIST(newlist != NULL);
ISC_LIST_UNLINK(newlist->rdata, newrdata, link);
}
dns_message_puttemprdata(msg, &newrdata);
}
if (newname != NULL)
dns_message_puttempname(msg, &newname);
if (newset != NULL) {
dns_rdataset_disassociate(newset);
dns_message_puttemprdataset(msg, &newset);
}
if (newlist != NULL)
dns_message_puttemprdatalist(msg, &newlist);
return (result);
}
static void
free_namelist(dns_message_t *msg, dns_namelist_t *namelist) {
dns_name_t *name;
dns_rdataset_t *set;
while (!ISC_LIST_EMPTY(*namelist)) {
name = ISC_LIST_HEAD(*namelist);
ISC_LIST_UNLINK(*namelist, name, link);
while (!ISC_LIST_EMPTY(name->list)) {
set = ISC_LIST_HEAD(name->list);
ISC_LIST_UNLINK(name->list, set, link);
dns_message_puttemprdataset(msg, &set);
}
dns_message_puttempname(msg, &name);
}
}
static isc_result_t
compute_secret(isc_buffer_t *shared, isc_region_t *queryrandomness,
isc_region_t *serverrandomness, isc_buffer_t *secret)
{
#ifndef PK11_MD5_DISABLE
isc_md5_t md5ctx;
isc_region_t r, r2;
unsigned char digests[32];
unsigned int i;
if (!isc_md5_available())
return (ISC_R_NOTIMPLEMENTED);
isc_buffer_usedregion(shared, &r);
/*
* MD5 ( query data | DH value ).
*/
isc_md5_init(&md5ctx);
isc_md5_update(&md5ctx, queryrandomness->base,
queryrandomness->length);
isc_md5_update(&md5ctx, r.base, r.length);
isc_md5_final(&md5ctx, digests);
/*
* MD5 ( server data | DH value ).
*/
isc_md5_init(&md5ctx);
isc_md5_update(&md5ctx, serverrandomness->base,
serverrandomness->length);
isc_md5_update(&md5ctx, r.base, r.length);
isc_md5_final(&md5ctx, &digests[ISC_MD5_DIGESTLENGTH]);
/*
* XOR ( DH value, MD5-1 | MD5-2).
*/
isc_buffer_availableregion(secret, &r);
isc_buffer_usedregion(shared, &r2);
if (r.length < sizeof(digests) || r.length < r2.length)
return (ISC_R_NOSPACE);
if (r2.length > sizeof(digests)) {
memmove(r.base, r2.base, r2.length);
for (i = 0; i < sizeof(digests); i++)
r.base[i] ^= digests[i];
isc_buffer_add(secret, r2.length);
} else {
memmove(r.base, digests, sizeof(digests));
for (i = 0; i < r2.length; i++)
r.base[i] ^= r2.base[i];
isc_buffer_add(secret, sizeof(digests));
}
return (ISC_R_SUCCESS);
#else
UNUSED(shared);
UNUSED(queryrandomness);
UNUSED(serverrandomness);
UNUSED(secret);
return (ISC_R_NOTIMPLEMENTED);
#endif
}
static isc_result_t
process_dhtkey(dns_message_t *msg, dns_name_t *signer, dns_name_t *name,
dns_rdata_tkey_t *tkeyin, dns_tkeyctx_t *tctx,
dns_rdata_tkey_t *tkeyout,
dns_tsig_keyring_t *ring, dns_namelist_t *namelist)
{
isc_result_t result = ISC_R_SUCCESS;
dns_name_t *keyname, ourname;
dns_rdataset_t *keyset = NULL;
dns_rdata_t keyrdata = DNS_RDATA_INIT, ourkeyrdata = DNS_RDATA_INIT;
bool found_key = false, found_incompatible = false;
dst_key_t *pubkey = NULL;
isc_buffer_t ourkeybuf, *shared = NULL;
isc_region_t r, r2, ourkeyr;
unsigned char keydata[DST_KEY_MAXSIZE];
unsigned int sharedsize;
isc_buffer_t secret;
unsigned char *randomdata = NULL, secretdata[256];
dns_ttl_t ttl = 0;
if (tctx->dhkey == NULL) {
tkey_log("process_dhtkey: tkey-dhkey not defined");
tkeyout->error = dns_tsigerror_badalg;
return (DNS_R_REFUSED);
}
#ifndef PK11_MD5_DISABLE
if (!isc_md5_available()) {
tkey_log("process_dhtkey: MD5 was disabled");
tkeyout->error = dns_tsigerror_badalg;
return (ISC_R_SUCCESS);
}
if (!dns_name_equal(&tkeyin->algorithm, DNS_TSIG_HMACMD5_NAME)) {
tkey_log("process_dhtkey: algorithms other than "
"hmac-md5 are not supported");
tkeyout->error = dns_tsigerror_badalg;
return (ISC_R_SUCCESS);
}
#else
tkey_log("process_dhtkey: MD5 was disabled");
tkeyout->error = dns_tsigerror_badalg;
return (ISC_R_SUCCESS);
#endif
/*
* Look for a DH KEY record that will work with ours.
*/
for (result = dns_message_firstname(msg, DNS_SECTION_ADDITIONAL);
result == ISC_R_SUCCESS && !found_key;
result = dns_message_nextname(msg, DNS_SECTION_ADDITIONAL)) {
keyname = NULL;
dns_message_currentname(msg, DNS_SECTION_ADDITIONAL, &keyname);
keyset = NULL;
result = dns_message_findtype(keyname, dns_rdatatype_key, 0,
&keyset);
if (result != ISC_R_SUCCESS)
continue;
for (result = dns_rdataset_first(keyset);
result == ISC_R_SUCCESS && !found_key;
result = dns_rdataset_next(keyset)) {
dns_rdataset_current(keyset, &keyrdata);
pubkey = NULL;
result = dns_dnssec_keyfromrdata(keyname, &keyrdata,
msg->mctx, &pubkey);
if (result != ISC_R_SUCCESS) {
dns_rdata_reset(&keyrdata);
continue;
}
#ifndef PK11_DH_DISABLE
if (dst_key_alg(pubkey) == DNS_KEYALG_DH) {
if (dst_key_paramcompare(pubkey, tctx->dhkey))
{
found_key = true;
ttl = keyset->ttl;
break;
} else
found_incompatible = true;
}
#endif
dst_key_free(&pubkey);
dns_rdata_reset(&keyrdata);
}
}
if (!found_key) {
if (found_incompatible) {
tkey_log("process_dhtkey: found an incompatible key");
tkeyout->error = dns_tsigerror_badkey;
return (ISC_R_SUCCESS);
} else {
tkey_log("process_dhtkey: failed to find a key");
return (DNS_R_FORMERR);
}
}
RETERR(add_rdata_to_list(msg, keyname, &keyrdata, ttl, namelist));
isc_buffer_init(&ourkeybuf, keydata, sizeof(keydata));
RETERR(dst_key_todns(tctx->dhkey, &ourkeybuf));
isc_buffer_usedregion(&ourkeybuf, &ourkeyr);
dns_rdata_fromregion(&ourkeyrdata, dns_rdataclass_any,
dns_rdatatype_key, &ourkeyr);
dns_name_init(&ourname, NULL);
dns_name_clone(dst_key_name(tctx->dhkey), &ourname);
/*
* XXXBEW The TTL should be obtained from the database, if it exists.
*/
RETERR(add_rdata_to_list(msg, &ourname, &ourkeyrdata, 0, namelist));
RETERR(dst_key_secretsize(tctx->dhkey, &sharedsize));
RETERR(isc_buffer_allocate(msg->mctx, &shared, sharedsize));
result = dst_key_computesecret(pubkey, tctx->dhkey, shared);
if (result != ISC_R_SUCCESS) {
tkey_log("process_dhtkey: failed to compute shared secret: %s",
isc_result_totext(result));
goto failure;
}
dst_key_free(&pubkey);
isc_buffer_init(&secret, secretdata, sizeof(secretdata));
randomdata = isc_mem_get(tkeyout->mctx, TKEY_RANDOM_AMOUNT);
if (randomdata == NULL)
goto failure;
result = dst__entropy_getdata(randomdata, TKEY_RANDOM_AMOUNT,
false);
if (result != ISC_R_SUCCESS) {
tkey_log("process_dhtkey: failed to obtain entropy: %s",
isc_result_totext(result));
goto failure;
}
r.base = randomdata;
r.length = TKEY_RANDOM_AMOUNT;
r2.base = tkeyin->key;
r2.length = tkeyin->keylen;
RETERR(compute_secret(shared, &r2, &r, &secret));
isc_buffer_free(&shared);
RETERR(dns_tsigkey_create(name, &tkeyin->algorithm,
isc_buffer_base(&secret),
isc_buffer_usedlength(&secret),
true, signer, tkeyin->inception,
tkeyin->expire, ring->mctx, ring, NULL));
/* This key is good for a long time */
tkeyout->inception = tkeyin->inception;
tkeyout->expire = tkeyin->expire;
tkeyout->key = randomdata;
tkeyout->keylen = TKEY_RANDOM_AMOUNT;
return (ISC_R_SUCCESS);
failure:
if (!ISC_LIST_EMPTY(*namelist))
free_namelist(msg, namelist);
if (shared != NULL)
isc_buffer_free(&shared);
if (pubkey != NULL)
dst_key_free(&pubkey);
if (randomdata != NULL)
isc_mem_put(tkeyout->mctx, randomdata, TKEY_RANDOM_AMOUNT);
return (result);
}
static isc_result_t
process_gsstkey(dns_message_t *msg, dns_name_t *name, dns_rdata_tkey_t *tkeyin,
dns_tkeyctx_t *tctx, dns_rdata_tkey_t *tkeyout,
dns_tsig_keyring_t *ring)
{
isc_result_t result = ISC_R_SUCCESS;
dst_key_t *dstkey = NULL;
dns_tsigkey_t *tsigkey = NULL;
dns_fixedname_t fixed;
dns_name_t *principal;
isc_stdtime_t now;
isc_region_t intoken;
isc_buffer_t *outtoken = NULL;
gss_ctx_id_t gss_ctx = NULL;
/*
* You have to define either a gss credential (principal) to
* accept with tkey-gssapi-credential, or you have to
* configure a specific keytab (with tkey-gssapi-keytab) in
* order to use gsstkey.
*/
if (tctx->gsscred == NULL && tctx->gssapi_keytab == NULL) {
tkey_log("process_gsstkey(): no tkey-gssapi-credential "
"or tkey-gssapi-keytab configured");
return (ISC_R_NOPERM);
}
if (!dns_name_equal(&tkeyin->algorithm, DNS_TSIG_GSSAPI_NAME) &&
!dns_name_equal(&tkeyin->algorithm, DNS_TSIG_GSSAPIMS_NAME)) {
tkeyout->error = dns_tsigerror_badalg;
tkey_log("process_gsstkey(): dns_tsigerror_badalg"); /* XXXSRA */
return (ISC_R_SUCCESS);
}
/*
* XXXDCL need to check for key expiry per 4.1.1
* XXXDCL need a way to check fully established, perhaps w/key_flags
*/
intoken.base = tkeyin->key;
intoken.length = tkeyin->keylen;
result = dns_tsigkey_find(&tsigkey, name, &tkeyin->algorithm, ring);
if (result == ISC_R_SUCCESS)
gss_ctx = dst_key_getgssctx(tsigkey->key);
principal = dns_fixedname_initname(&fixed);
/*
* Note that tctx->gsscred may be NULL if tctx->gssapi_keytab is set
*/
result = dst_gssapi_acceptctx(tctx->gsscred, tctx->gssapi_keytab,
&intoken, &outtoken, &gss_ctx,
principal, tctx->mctx);
if (result == DNS_R_INVALIDTKEY) {
if (tsigkey != NULL)
dns_tsigkey_detach(&tsigkey);
tkeyout->error = dns_tsigerror_badkey;
tkey_log("process_gsstkey(): dns_tsigerror_badkey"); /* XXXSRA */
return (ISC_R_SUCCESS);
}
if (result != DNS_R_CONTINUE && result != ISC_R_SUCCESS)
goto failure;
/*
* XXXDCL Section 4.1.3: Limit GSS_S_CONTINUE_NEEDED to 10 times.
*/
isc_stdtime_get(&now);
if (dns_name_countlabels(principal) == 0U) {
if (tsigkey != NULL) {
dns_tsigkey_detach(&tsigkey);
}
} else if (tsigkey == NULL) {
#ifdef GSSAPI
OM_uint32 gret, minor, lifetime;
#endif
uint32_t expire;
RETERR(dst_key_fromgssapi(name, gss_ctx, ring->mctx,
&dstkey, &intoken));
/*
* Limit keys to 1 hour or the context's lifetime whichever
* is smaller.
*/
expire = now + 3600;
#ifdef GSSAPI
gret = gss_context_time(&minor, gss_ctx, &lifetime);
if (gret == GSS_S_COMPLETE && now + lifetime < expire)
expire = now + lifetime;
#endif
RETERR(dns_tsigkey_createfromkey(name, &tkeyin->algorithm,
dstkey, true, principal,
now, expire, ring->mctx, ring,
&tsigkey));
dst_key_free(&dstkey);
tkeyout->inception = now;
tkeyout->expire = expire;
} else {
tkeyout->inception = tsigkey->inception;
tkeyout->expire = tsigkey->expire;
}
if (outtoken) {
tkeyout->key = isc_mem_get(tkeyout->mctx,
isc_buffer_usedlength(outtoken));
if (tkeyout->key == NULL) {
result = ISC_R_NOMEMORY;
goto failure;
}
tkeyout->keylen = isc_buffer_usedlength(outtoken);
memmove(tkeyout->key, isc_buffer_base(outtoken),
isc_buffer_usedlength(outtoken));
isc_buffer_free(&outtoken);
} else {
tkeyout->key = isc_mem_get(tkeyout->mctx, tkeyin->keylen);
if (tkeyout->key == NULL) {
result = ISC_R_NOMEMORY;
goto failure;
}
tkeyout->keylen = tkeyin->keylen;
memmove(tkeyout->key, tkeyin->key, tkeyin->keylen);
}
tkeyout->error = dns_rcode_noerror;
tkey_log("process_gsstkey(): dns_tsigerror_noerror"); /* XXXSRA */
/*
* We found a TKEY to respond with. If the request is not TSIG signed,
* we need to make sure the response is signed (see RFC 3645, Section
* 2.2).
*/
if (tsigkey != NULL) {
if (msg->tsigkey == NULL && msg->sig0key == NULL) {
dns_message_settsigkey(msg, tsigkey);
}
dns_tsigkey_detach(&tsigkey);
}
return (ISC_R_SUCCESS);
failure:
if (tsigkey != NULL)
dns_tsigkey_detach(&tsigkey);
if (dstkey != NULL)
dst_key_free(&dstkey);
if (outtoken != NULL)
isc_buffer_free(&outtoken);
tkey_log("process_gsstkey(): %s",
isc_result_totext(result)); /* XXXSRA */
return (result);
}
static isc_result_t
process_deletetkey(dns_name_t *signer, dns_name_t *name,
dns_rdata_tkey_t *tkeyin, dns_rdata_tkey_t *tkeyout,
dns_tsig_keyring_t *ring)
{
isc_result_t result;
dns_tsigkey_t *tsigkey = NULL;
const dns_name_t *identity;
result = dns_tsigkey_find(&tsigkey, name, &tkeyin->algorithm, ring);
if (result != ISC_R_SUCCESS) {
tkeyout->error = dns_tsigerror_badname;
return (ISC_R_SUCCESS);
}
/*
* Only allow a delete if the identity that created the key is the
* same as the identity that signed the message.
*/
identity = dns_tsigkey_identity(tsigkey);
if (identity == NULL || !dns_name_equal(identity, signer)) {
dns_tsigkey_detach(&tsigkey);
return (DNS_R_REFUSED);
}
/*
* Set the key to be deleted when no references are left. If the key
* was not generated with TKEY and is in the config file, it may be
* reloaded later.
*/
dns_tsigkey_setdeleted(tsigkey);
/* Release the reference */
dns_tsigkey_detach(&tsigkey);
return (ISC_R_SUCCESS);
}
isc_result_t
dns_tkey_processquery(dns_message_t *msg, dns_tkeyctx_t *tctx,
dns_tsig_keyring_t *ring)
{
isc_result_t result = ISC_R_SUCCESS;
dns_rdata_tkey_t tkeyin, tkeyout;
bool freetkeyin = false;
dns_name_t *qname, *name, *keyname, *signer, tsigner;
dns_fixedname_t fkeyname;
dns_rdataset_t *tkeyset;
dns_rdata_t rdata;
dns_namelist_t namelist;
char tkeyoutdata[512];
isc_buffer_t tkeyoutbuf;
REQUIRE(msg != NULL);
REQUIRE(tctx != NULL);
REQUIRE(ring != NULL);
ISC_LIST_INIT(namelist);
/*
* Interpret the question section.
*/
result = dns_message_firstname(msg, DNS_SECTION_QUESTION);
if (result != ISC_R_SUCCESS)
return (DNS_R_FORMERR);
qname = NULL;
dns_message_currentname(msg, DNS_SECTION_QUESTION, &qname);
/*
* Look for a TKEY record that matches the question.
*/
tkeyset = NULL;
name = NULL;
result = dns_message_findname(msg, DNS_SECTION_ADDITIONAL, qname,
dns_rdatatype_tkey, 0, &name, &tkeyset);
if (result != ISC_R_SUCCESS) {
/*
* Try the answer section, since that's where Win2000
* puts it.
*/
name = NULL;
if (dns_message_findname(msg, DNS_SECTION_ANSWER, qname,
dns_rdatatype_tkey, 0, &name,
&tkeyset) != ISC_R_SUCCESS) {
result = DNS_R_FORMERR;
tkey_log("dns_tkey_processquery: couldn't find a TKEY "
"matching the question");
goto failure;
}
}
result = dns_rdataset_first(tkeyset);
if (result != ISC_R_SUCCESS) {
result = DNS_R_FORMERR;
goto failure;
}
dns_rdata_init(&rdata);
dns_rdataset_current(tkeyset, &rdata);
RETERR(dns_rdata_tostruct(&rdata, &tkeyin, NULL));
freetkeyin = true;
if (tkeyin.error != dns_rcode_noerror) {
result = DNS_R_FORMERR;
goto failure;
}
/*
* Before we go any farther, verify that the message was signed.
* GSSAPI TKEY doesn't require a signature, the rest do.
*/
dns_name_init(&tsigner, NULL);
result = dns_message_signer(msg, &tsigner);
if (result != ISC_R_SUCCESS) {
if (tkeyin.mode == DNS_TKEYMODE_GSSAPI &&
result == ISC_R_NOTFOUND) {
signer = NULL;
} else {
tkey_log("dns_tkey_processquery: query was not "
"properly signed - rejecting");
result = DNS_R_FORMERR;
goto failure;
}
} else
signer = &tsigner;
tkeyout.common.rdclass = tkeyin.common.rdclass;
tkeyout.common.rdtype = tkeyin.common.rdtype;
ISC_LINK_INIT(&tkeyout.common, link);
tkeyout.mctx = msg->mctx;
dns_name_init(&tkeyout.algorithm, NULL);
dns_name_clone(&tkeyin.algorithm, &tkeyout.algorithm);
tkeyout.inception = tkeyout.expire = 0;
tkeyout.mode = tkeyin.mode;
tkeyout.error = 0;
tkeyout.keylen = tkeyout.otherlen = 0;
tkeyout.key = tkeyout.other = NULL;
/*
* A delete operation must have a fully specified key name. If this
* is not a delete, we do the following:
* if (qname != ".")
* keyname = qname + defaultdomain
* else
* keyname = <random hex> + defaultdomain
*/
if (tkeyin.mode != DNS_TKEYMODE_DELETE) {
dns_tsigkey_t *tsigkey = NULL;
if (tctx->domain == NULL && tkeyin.mode != DNS_TKEYMODE_GSSAPI) {
tkey_log("dns_tkey_processquery: tkey-domain not set");
result = DNS_R_REFUSED;
goto failure;
}
keyname = dns_fixedname_initname(&fkeyname);
if (!dns_name_equal(qname, dns_rootname)) {
unsigned int n = dns_name_countlabels(qname);
RUNTIME_CHECK(dns_name_copy(qname, keyname, NULL)
== ISC_R_SUCCESS);
dns_name_getlabelsequence(keyname, 0, n - 1, keyname);
} else {
static char hexdigits[16] = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
unsigned char randomdata[16];
char randomtext[32];
isc_buffer_t b;
unsigned int i, j;
result = isc_entropy_getdata(tctx->ectx,
randomdata,
sizeof(randomdata),
NULL, 0);
if (result != ISC_R_SUCCESS)
goto failure;
for (i = 0, j = 0; i < sizeof(randomdata); i++) {
unsigned char val = randomdata[i];
randomtext[j++] = hexdigits[val >> 4];
randomtext[j++] = hexdigits[val & 0xF];
}
isc_buffer_init(&b, randomtext, sizeof(randomtext));
isc_buffer_add(&b, sizeof(randomtext));
result = dns_name_fromtext(keyname, &b, NULL, 0, NULL);
if (result != ISC_R_SUCCESS)
goto failure;
}
if (tkeyin.mode == DNS_TKEYMODE_GSSAPI) {
/* Yup. This is a hack */
result = dns_name_concatenate(keyname, dns_rootname,
keyname, NULL);
if (result != ISC_R_SUCCESS)
goto failure;
} else {
result = dns_name_concatenate(keyname, tctx->domain,
keyname, NULL);
if (result != ISC_R_SUCCESS)
goto failure;
}
result = dns_tsigkey_find(&tsigkey, keyname, NULL, ring);
if (result == ISC_R_SUCCESS) {
tkeyout.error = dns_tsigerror_badname;
dns_tsigkey_detach(&tsigkey);
goto failure_with_tkey;
} else if (result != ISC_R_NOTFOUND)
goto failure;
} else
keyname = qname;
switch (tkeyin.mode) {
case DNS_TKEYMODE_DIFFIEHELLMAN:
tkeyout.error = dns_rcode_noerror;
RETERR(process_dhtkey(msg, signer, keyname, &tkeyin,
tctx, &tkeyout, ring,
&namelist));
break;
case DNS_TKEYMODE_GSSAPI:
tkeyout.error = dns_rcode_noerror;
RETERR(process_gsstkey(msg, keyname, &tkeyin, tctx,
&tkeyout, ring));
break;
case DNS_TKEYMODE_DELETE:
tkeyout.error = dns_rcode_noerror;
RETERR(process_deletetkey(signer, keyname, &tkeyin,
&tkeyout, ring));
break;
case DNS_TKEYMODE_SERVERASSIGNED:
case DNS_TKEYMODE_RESOLVERASSIGNED:
result = DNS_R_NOTIMP;
goto failure;
default:
tkeyout.error = dns_tsigerror_badmode;
}
failure_with_tkey:
dns_rdata_init(&rdata);
isc_buffer_init(&tkeyoutbuf, tkeyoutdata, sizeof(tkeyoutdata));
result = dns_rdata_fromstruct(&rdata, tkeyout.common.rdclass,
tkeyout.common.rdtype, &tkeyout,
&tkeyoutbuf);
if (freetkeyin) {
dns_rdata_freestruct(&tkeyin);
freetkeyin = false;
}
if (tkeyout.key != NULL)
isc_mem_put(tkeyout.mctx, tkeyout.key, tkeyout.keylen);
if (tkeyout.other != NULL)
isc_mem_put(tkeyout.mctx, tkeyout.other, tkeyout.otherlen);
if (result != ISC_R_SUCCESS)
goto failure;
RETERR(add_rdata_to_list(msg, keyname, &rdata, 0, &namelist));
RETERR(dns_message_reply(msg, true));
name = ISC_LIST_HEAD(namelist);
while (name != NULL) {
dns_name_t *next = ISC_LIST_NEXT(name, link);
ISC_LIST_UNLINK(namelist, name, link);
dns_message_addname(msg, name, DNS_SECTION_ANSWER);
name = next;
}
return (ISC_R_SUCCESS);
failure:
if (freetkeyin)
dns_rdata_freestruct(&tkeyin);
if (!ISC_LIST_EMPTY(namelist))
free_namelist(msg, &namelist);
return (result);
}
static isc_result_t
buildquery(dns_message_t *msg, dns_name_t *name,
dns_rdata_tkey_t *tkey, bool win2k)
{
dns_name_t *qname = NULL, *aname = NULL;
dns_rdataset_t *question = NULL, *tkeyset = NULL;
dns_rdatalist_t *tkeylist = NULL;
dns_rdata_t *rdata = NULL;
isc_buffer_t *dynbuf = NULL, *anamebuf = NULL, *qnamebuf = NULL;
isc_result_t result;
unsigned int len;
REQUIRE(msg != NULL);
REQUIRE(name != NULL);
REQUIRE(tkey != NULL);
RETERR(dns_message_gettempname(msg, &qname));
RETERR(dns_message_gettempname(msg, &aname));
RETERR(dns_message_gettemprdataset(msg, &question));
dns_rdataset_makequestion(question, dns_rdataclass_any,
dns_rdatatype_tkey);
len = 16 + tkey->algorithm.length + tkey->keylen + tkey->otherlen;
RETERR(isc_buffer_allocate(msg->mctx, &dynbuf, len));
RETERR(isc_buffer_allocate(msg->mctx, &anamebuf, name->length));
RETERR(isc_buffer_allocate(msg->mctx, &qnamebuf, name->length));
RETERR(dns_message_gettemprdata(msg, &rdata));
RETERR(dns_rdata_fromstruct(rdata, dns_rdataclass_any,
dns_rdatatype_tkey, tkey, dynbuf));
dns_message_takebuffer(msg, &dynbuf);
RETERR(dns_message_gettemprdatalist(msg, &tkeylist));
tkeylist->rdclass = dns_rdataclass_any;
tkeylist->type = dns_rdatatype_tkey;
ISC_LIST_APPEND(tkeylist->rdata, rdata, link);
RETERR(dns_message_gettemprdataset(msg, &tkeyset));
RETERR(dns_rdatalist_tordataset(tkeylist, tkeyset));
dns_name_init(qname, NULL);
RETERR(dns_name_copy(name, qname, qnamebuf));
dns_name_init(aname, NULL);
RETERR(dns_name_copy(name, aname, anamebuf));
ISC_LIST_APPEND(qname->list, question, link);
ISC_LIST_APPEND(aname->list, tkeyset, link);
dns_message_addname(msg, qname, DNS_SECTION_QUESTION);
dns_message_takebuffer(msg, &qnamebuf);
/*
* Windows 2000 needs this in the answer section, not the additional
* section where the RFC specifies.
*/
if (win2k)
dns_message_addname(msg, aname, DNS_SECTION_ANSWER);
else
dns_message_addname(msg, aname, DNS_SECTION_ADDITIONAL);
dns_message_takebuffer(msg, &anamebuf);
return (ISC_R_SUCCESS);
failure:
if (qname != NULL)
dns_message_puttempname(msg, &qname);
if (aname != NULL)
dns_message_puttempname(msg, &aname);
if (question != NULL) {
dns_rdataset_disassociate(question);
dns_message_puttemprdataset(msg, &question);
}
if (dynbuf != NULL)
isc_buffer_free(&dynbuf);
if (qnamebuf != NULL)
isc_buffer_free(&qnamebuf);
if (anamebuf != NULL)
isc_buffer_free(&anamebuf);
return (result);
}
isc_result_t
dns_tkey_builddhquery(dns_message_t *msg, dst_key_t *key, dns_name_t *name,
dns_name_t *algorithm, isc_buffer_t *nonce,
uint32_t lifetime)
{
dns_rdata_tkey_t tkey;
dns_rdata_t *rdata = NULL;
isc_buffer_t *dynbuf = NULL;
isc_region_t r;
dns_name_t keyname;
dns_namelist_t namelist;
isc_result_t result;
isc_stdtime_t now;
REQUIRE(msg != NULL);
REQUIRE(key != NULL);
REQUIRE(dst_key_alg(key) == DNS_KEYALG_DH);
REQUIRE(dst_key_isprivate(key));
REQUIRE(name != NULL);
REQUIRE(algorithm != NULL);
tkey.common.rdclass = dns_rdataclass_any;
tkey.common.rdtype = dns_rdatatype_tkey;
ISC_LINK_INIT(&tkey.common, link);
tkey.mctx = msg->mctx;
dns_name_init(&tkey.algorithm, NULL);
dns_name_clone(algorithm, &tkey.algorithm);
isc_stdtime_get(&now);
tkey.inception = now;
tkey.expire = now + lifetime;
tkey.mode = DNS_TKEYMODE_DIFFIEHELLMAN;
if (nonce != NULL)
isc_buffer_usedregion(nonce, &r);
else {
r.base = NULL;
r.length = 0;
}
tkey.error = 0;
tkey.key = r.base;
tkey.keylen = r.length;
tkey.other = NULL;
tkey.otherlen = 0;
RETERR(buildquery(msg, name, &tkey, false));
RETERR(dns_message_gettemprdata(msg, &rdata));
RETERR(isc_buffer_allocate(msg->mctx, &dynbuf, 1024));
RETERR(dst_key_todns(key, dynbuf));
isc_buffer_usedregion(dynbuf, &r);
dns_rdata_fromregion(rdata, dns_rdataclass_any,
dns_rdatatype_key, &r);
dns_message_takebuffer(msg, &dynbuf);
dns_name_init(&keyname, NULL);
dns_name_clone(dst_key_name(key), &keyname);
ISC_LIST_INIT(namelist);
RETERR(add_rdata_to_list(msg, &keyname, rdata, 0, &namelist));
name = ISC_LIST_HEAD(namelist);
while (name != NULL) {
dns_name_t *next = ISC_LIST_NEXT(name, link);
ISC_LIST_UNLINK(namelist, name, link);
dns_message_addname(msg, name, DNS_SECTION_ADDITIONAL);
name = next;
}
return (ISC_R_SUCCESS);
failure:
if (dynbuf != NULL)
isc_buffer_free(&dynbuf);
return (result);
}
isc_result_t
dns_tkey_buildgssquery(dns_message_t *msg, dns_name_t *name, dns_name_t *gname,
isc_buffer_t *intoken, uint32_t lifetime,
gss_ctx_id_t *context, bool win2k,
isc_mem_t *mctx, char **err_message)
{
dns_rdata_tkey_t tkey;
isc_result_t result;
isc_stdtime_t now;
isc_buffer_t token;
unsigned char array[TEMP_BUFFER_SZ];
UNUSED(intoken);
REQUIRE(msg != NULL);
REQUIRE(name != NULL);
REQUIRE(gname != NULL);
REQUIRE(context != NULL);
REQUIRE(mctx != NULL);
isc_buffer_init(&token, array, sizeof(array));
result = dst_gssapi_initctx(gname, NULL, &token, context,
mctx, err_message);
if (result != DNS_R_CONTINUE && result != ISC_R_SUCCESS)
return (result);
tkey.common.rdclass = dns_rdataclass_any;
tkey.common.rdtype = dns_rdatatype_tkey;
ISC_LINK_INIT(&tkey.common, link);
tkey.mctx = NULL;
dns_name_init(&tkey.algorithm, NULL);
if (win2k)
dns_name_clone(DNS_TSIG_GSSAPIMS_NAME, &tkey.algorithm);
else
dns_name_clone(DNS_TSIG_GSSAPI_NAME, &tkey.algorithm);
isc_stdtime_get(&now);
tkey.inception = now;
tkey.expire = now + lifetime;
tkey.mode = DNS_TKEYMODE_GSSAPI;
tkey.error = 0;
tkey.key = isc_buffer_base(&token);
tkey.keylen = isc_buffer_usedlength(&token);
tkey.other = NULL;
tkey.otherlen = 0;
return (buildquery(msg, name, &tkey, win2k));
}
isc_result_t
dns_tkey_builddeletequery(dns_message_t *msg, dns_tsigkey_t *key) {
dns_rdata_tkey_t tkey;
REQUIRE(msg != NULL);
REQUIRE(key != NULL);
tkey.common.rdclass = dns_rdataclass_any;
tkey.common.rdtype = dns_rdatatype_tkey;
ISC_LINK_INIT(&tkey.common, link);
tkey.mctx = msg->mctx;
dns_name_init(&tkey.algorithm, NULL);
dns_name_clone(key->algorithm, &tkey.algorithm);
tkey.inception = tkey.expire = 0;
tkey.mode = DNS_TKEYMODE_DELETE;
tkey.error = 0;
tkey.keylen = tkey.otherlen = 0;
tkey.key = tkey.other = NULL;
return (buildquery(msg, &key->name, &tkey, false));
}
static isc_result_t
find_tkey(dns_message_t *msg, dns_name_t **name, dns_rdata_t *rdata,
int section)
{
dns_rdataset_t *tkeyset;
isc_result_t result;
result = dns_message_firstname(msg, section);
while (result == ISC_R_SUCCESS) {
*name = NULL;
dns_message_currentname(msg, section, name);
tkeyset = NULL;
result = dns_message_findtype(*name, dns_rdatatype_tkey, 0,
&tkeyset);
if (result == ISC_R_SUCCESS) {
result = dns_rdataset_first(tkeyset);
if (result != ISC_R_SUCCESS)
return (result);
dns_rdataset_current(tkeyset, rdata);
return (ISC_R_SUCCESS);
}
result = dns_message_nextname(msg, section);
}
if (result == ISC_R_NOMORE)
return (ISC_R_NOTFOUND);
return (result);
}
isc_result_t
dns_tkey_processdhresponse(dns_message_t *qmsg, dns_message_t *rmsg,
dst_key_t *key, isc_buffer_t *nonce,
dns_tsigkey_t **outkey, dns_tsig_keyring_t *ring)
{
dns_rdata_t qtkeyrdata = DNS_RDATA_INIT, rtkeyrdata = DNS_RDATA_INIT;
dns_name_t keyname, *tkeyname, *theirkeyname, *ourkeyname, *tempname;
dns_rdataset_t *theirkeyset = NULL, *ourkeyset = NULL;
dns_rdata_t theirkeyrdata = DNS_RDATA_INIT;
dst_key_t *theirkey = NULL;
dns_rdata_tkey_t qtkey, rtkey;
unsigned char secretdata[256];
unsigned int sharedsize;
isc_buffer_t *shared = NULL, secret;
isc_region_t r, r2;
isc_result_t result;
bool freertkey = false;
REQUIRE(qmsg != NULL);
REQUIRE(rmsg != NULL);
REQUIRE(key != NULL);
REQUIRE(dst_key_alg(key) == DNS_KEYALG_DH);
REQUIRE(dst_key_isprivate(key));
if (outkey != NULL)
REQUIRE(*outkey == NULL);
if (rmsg->rcode != dns_rcode_noerror)
return (ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
freertkey = true;
RETERR(find_tkey(qmsg, &tempname, &qtkeyrdata,
DNS_SECTION_ADDITIONAL));
RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
if (rtkey.error != dns_rcode_noerror ||
rtkey.mode != DNS_TKEYMODE_DIFFIEHELLMAN ||
rtkey.mode != qtkey.mode ||
!dns_name_equal(&rtkey.algorithm, &qtkey.algorithm) ||
rmsg->rcode != dns_rcode_noerror) {
tkey_log("dns_tkey_processdhresponse: tkey mode invalid "
"or error set(1)");
result = DNS_R_INVALIDTKEY;
dns_rdata_freestruct(&qtkey);
goto failure;
}
dns_rdata_freestruct(&qtkey);
dns_name_init(&keyname, NULL);
dns_name_clone(dst_key_name(key), &keyname);
ourkeyname = NULL;
ourkeyset = NULL;
RETERR(dns_message_findname(rmsg, DNS_SECTION_ANSWER, &keyname,
dns_rdatatype_key, 0, &ourkeyname,
&ourkeyset));
result = dns_message_firstname(rmsg, DNS_SECTION_ANSWER);
while (result == ISC_R_SUCCESS) {
theirkeyname = NULL;
dns_message_currentname(rmsg, DNS_SECTION_ANSWER,
&theirkeyname);
if (dns_name_equal(theirkeyname, ourkeyname))
goto next;
theirkeyset = NULL;
result = dns_message_findtype(theirkeyname, dns_rdatatype_key,
0, &theirkeyset);
if (result == ISC_R_SUCCESS) {
RETERR(dns_rdataset_first(theirkeyset));
break;
}
next:
result = dns_message_nextname(rmsg, DNS_SECTION_ANSWER);
}
if (theirkeyset == NULL) {
tkey_log("dns_tkey_processdhresponse: failed to find server "
"key");
result = ISC_R_NOTFOUND;
goto failure;
}
dns_rdataset_current(theirkeyset, &theirkeyrdata);
RETERR(dns_dnssec_keyfromrdata(theirkeyname, &theirkeyrdata,
rmsg->mctx, &theirkey));
RETERR(dst_key_secretsize(key, &sharedsize));
RETERR(isc_buffer_allocate(rmsg->mctx, &shared, sharedsize));
RETERR(dst_key_computesecret(theirkey, key, shared));
isc_buffer_init(&secret, secretdata, sizeof(secretdata));
r.base = rtkey.key;
r.length = rtkey.keylen;
if (nonce != NULL)
isc_buffer_usedregion(nonce, &r2);
else {
r2.base = NULL;
r2.length = 0;
}
RETERR(compute_secret(shared, &r2, &r, &secret));
isc_buffer_usedregion(&secret, &r);
result = dns_tsigkey_create(tkeyname, &rtkey.algorithm,
r.base, r.length, true,
NULL, rtkey.inception, rtkey.expire,
rmsg->mctx, ring, outkey);
isc_buffer_free(&shared);
dns_rdata_freestruct(&rtkey);
dst_key_free(&theirkey);
return (result);
failure:
if (shared != NULL)
isc_buffer_free(&shared);
if (theirkey != NULL)
dst_key_free(&theirkey);
if (freertkey)
dns_rdata_freestruct(&rtkey);
return (result);
}
isc_result_t
dns_tkey_processgssresponse(dns_message_t *qmsg, dns_message_t *rmsg,
dns_name_t *gname, gss_ctx_id_t *context,
isc_buffer_t *outtoken, dns_tsigkey_t **outkey,
dns_tsig_keyring_t *ring, char **err_message)
{
dns_rdata_t rtkeyrdata = DNS_RDATA_INIT, qtkeyrdata = DNS_RDATA_INIT;
dns_name_t *tkeyname;
dns_rdata_tkey_t rtkey, qtkey;
dst_key_t *dstkey = NULL;
isc_buffer_t intoken;
isc_result_t result;
unsigned char array[TEMP_BUFFER_SZ];
REQUIRE(outtoken != NULL);
REQUIRE(qmsg != NULL);
REQUIRE(rmsg != NULL);
REQUIRE(gname != NULL);
REQUIRE(ring != NULL);
if (outkey != NULL)
REQUIRE(*outkey == NULL);
if (rmsg->rcode != dns_rcode_noerror)
return (ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
/*
* Win2k puts the item in the ANSWER section, while the RFC
* specifies it should be in the ADDITIONAL section. Check first
* where it should be, and then where it may be.
*/
result = find_tkey(qmsg, &tkeyname, &qtkeyrdata,
DNS_SECTION_ADDITIONAL);
if (result == ISC_R_NOTFOUND)
result = find_tkey(qmsg, &tkeyname, &qtkeyrdata,
DNS_SECTION_ANSWER);
if (result != ISC_R_SUCCESS)
goto failure;
RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
if (rtkey.error != dns_rcode_noerror ||
rtkey.mode != DNS_TKEYMODE_GSSAPI ||
!dns_name_equal(&rtkey.algorithm, &qtkey.algorithm)) {
tkey_log("dns_tkey_processgssresponse: tkey mode invalid "
"or error set(2) %d", rtkey.error);
dumpmessage(qmsg);
dumpmessage(rmsg);
result = DNS_R_INVALIDTKEY;
goto failure;
}
isc_buffer_init(outtoken, array, sizeof(array));
isc_buffer_init(&intoken, rtkey.key, rtkey.keylen);
RETERR(dst_gssapi_initctx(gname, &intoken, outtoken, context,
ring->mctx, err_message));
RETERR(dst_key_fromgssapi(dns_rootname, *context, rmsg->mctx,
&dstkey, NULL));
RETERR(dns_tsigkey_createfromkey(tkeyname, DNS_TSIG_GSSAPI_NAME,
dstkey, false, NULL,
rtkey.inception, rtkey.expire,
ring->mctx, ring, outkey));
dst_key_free(&dstkey);
dns_rdata_freestruct(&rtkey);
return (result);
failure:
/*
* XXXSRA This probably leaks memory from rtkey and qtkey.
*/
if (dstkey != NULL)
dst_key_free(&dstkey);
return (result);
}
isc_result_t
dns_tkey_processdeleteresponse(dns_message_t *qmsg, dns_message_t *rmsg,
dns_tsig_keyring_t *ring)
{
dns_rdata_t qtkeyrdata = DNS_RDATA_INIT, rtkeyrdata = DNS_RDATA_INIT;
dns_name_t *tkeyname, *tempname;
dns_rdata_tkey_t qtkey, rtkey;
dns_tsigkey_t *tsigkey = NULL;
isc_result_t result;
REQUIRE(qmsg != NULL);
REQUIRE(rmsg != NULL);
if (rmsg->rcode != dns_rcode_noerror)
return(ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
RETERR(find_tkey(qmsg, &tempname, &qtkeyrdata,
DNS_SECTION_ADDITIONAL));
RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
if (rtkey.error != dns_rcode_noerror ||
rtkey.mode != DNS_TKEYMODE_DELETE ||
rtkey.mode != qtkey.mode ||
!dns_name_equal(&rtkey.algorithm, &qtkey.algorithm) ||
rmsg->rcode != dns_rcode_noerror) {
tkey_log("dns_tkey_processdeleteresponse: tkey mode invalid "
"or error set(3)");
result = DNS_R_INVALIDTKEY;
dns_rdata_freestruct(&qtkey);
dns_rdata_freestruct(&rtkey);
goto failure;
}
dns_rdata_freestruct(&qtkey);
RETERR(dns_tsigkey_find(&tsigkey, tkeyname, &rtkey.algorithm, ring));
dns_rdata_freestruct(&rtkey);
/*
* Mark the key as deleted.
*/
dns_tsigkey_setdeleted(tsigkey);
/*
* Release the reference.
*/
dns_tsigkey_detach(&tsigkey);
failure:
return (result);
}
isc_result_t
dns_tkey_gssnegotiate(dns_message_t *qmsg, dns_message_t *rmsg,
dns_name_t *server, gss_ctx_id_t *context,
dns_tsigkey_t **outkey, dns_tsig_keyring_t *ring,
bool win2k, char **err_message)
{
dns_rdata_t rtkeyrdata = DNS_RDATA_INIT, qtkeyrdata = DNS_RDATA_INIT;
dns_name_t *tkeyname;
dns_rdata_tkey_t rtkey, qtkey, tkey;
isc_buffer_t intoken, outtoken;
dst_key_t *dstkey = NULL;
isc_result_t result;
unsigned char array[TEMP_BUFFER_SZ];
bool freertkey = false;
REQUIRE(qmsg != NULL);
REQUIRE(rmsg != NULL);
REQUIRE(server != NULL);
if (outkey != NULL)
REQUIRE(*outkey == NULL);
if (rmsg->rcode != dns_rcode_noerror)
return (ISC_RESULTCLASS_DNSRCODE + rmsg->rcode);
RETERR(find_tkey(rmsg, &tkeyname, &rtkeyrdata, DNS_SECTION_ANSWER));
RETERR(dns_rdata_tostruct(&rtkeyrdata, &rtkey, NULL));
freertkey = true;
if (win2k == true)
RETERR(find_tkey(qmsg, &tkeyname, &qtkeyrdata,
DNS_SECTION_ANSWER));
else
RETERR(find_tkey(qmsg, &tkeyname, &qtkeyrdata,
DNS_SECTION_ADDITIONAL));
RETERR(dns_rdata_tostruct(&qtkeyrdata, &qtkey, NULL));
if (rtkey.error != dns_rcode_noerror ||
rtkey.mode != DNS_TKEYMODE_GSSAPI ||
!dns_name_equal(&rtkey.algorithm, &qtkey.algorithm))
{
tkey_log("dns_tkey_processdhresponse: tkey mode invalid "
"or error set(4)");
result = DNS_R_INVALIDTKEY;
goto failure;
}
isc_buffer_init(&intoken, rtkey.key, rtkey.keylen);
isc_buffer_init(&outtoken, array, sizeof(array));
result = dst_gssapi_initctx(server, &intoken, &outtoken, context,
ring->mctx, err_message);
if (result != DNS_R_CONTINUE && result != ISC_R_SUCCESS)
return (result);
if (result == DNS_R_CONTINUE) {
dns_fixedname_t fixed;
dns_fixedname_init(&fixed);
dns_name_copy(tkeyname, dns_fixedname_name(&fixed), NULL);
tkeyname = dns_fixedname_name(&fixed);
tkey.common.rdclass = dns_rdataclass_any;
tkey.common.rdtype = dns_rdatatype_tkey;
ISC_LINK_INIT(&tkey.common, link);
tkey.mctx = NULL;
dns_name_init(&tkey.algorithm, NULL);
if (win2k)
dns_name_clone(DNS_TSIG_GSSAPIMS_NAME, &tkey.algorithm);
else
dns_name_clone(DNS_TSIG_GSSAPI_NAME, &tkey.algorithm);
tkey.inception = qtkey.inception;
tkey.expire = qtkey.expire;
tkey.mode = DNS_TKEYMODE_GSSAPI;
tkey.error = 0;
tkey.key = isc_buffer_base(&outtoken);
tkey.keylen = isc_buffer_usedlength(&outtoken);
tkey.other = NULL;
tkey.otherlen = 0;
dns_message_reset(qmsg, DNS_MESSAGE_INTENTRENDER);
RETERR(buildquery(qmsg, tkeyname, &tkey, win2k));
return (DNS_R_CONTINUE);
}
RETERR(dst_key_fromgssapi(dns_rootname, *context, rmsg->mctx,
&dstkey, NULL));
/*
* XXXSRA This seems confused. If we got CONTINUE from initctx,
* the GSS negotiation hasn't completed yet, so we can't sign
* anything yet.
*/
RETERR(dns_tsigkey_createfromkey(tkeyname,
(win2k
? DNS_TSIG_GSSAPIMS_NAME
: DNS_TSIG_GSSAPI_NAME),
dstkey, true, NULL,
rtkey.inception, rtkey.expire,
ring->mctx, ring, outkey));
dst_key_free(&dstkey);
dns_rdata_freestruct(&rtkey);
return (result);
failure:
/*
* XXXSRA This probably leaks memory from qtkey.
*/
if (freertkey)
dns_rdata_freestruct(&rtkey);
if (dstkey != NULL)
dst_key_free(&dstkey);
return (result);
}