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/*
* Portions Copyright (C) 2004-2007 Internet Systems Consortium, Inc. ("ISC")
* Portions Copyright (C) 1999-2002 Internet Software Consortium.
* Portions Copyright (C) 1995-2000 by Network Associates, Inc.
*
* Permission to use, copy, modify, and/or 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 ISC AND NETWORK ASSOCIATES DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC 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.
*/
/*
* Principal Author: Brian Wellington
* $Id: openssldh_link.c,v 1.1.6.10 2007/08/28 07:20:04 tbox Exp $
*/
#ifdef OPENSSL
#include <config.h>
#include <ctype.h>
#include <isc/mem.h>
#include <isc/string.h>
#include <isc/util.h>
#include <dst/result.h>
#include "dst_internal.h"
#include "dst_openssl.h"
#include "dst_parse.h"
#include <openssl/dh.h>
#define PRIME768 "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088" \
"A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25" \
"F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A63A3620FFFFFFFFFFFFFFFF"
#define PRIME1024 "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E08" \
"8A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF2" \
"5F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406" \
"B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF"
#define PRIME1536 "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" \
"29024E088A67CC74020BBEA63B139B22514A08798E3404DD" \
"EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" \
"E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" \
"EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D" \
"C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F" \
"83655D23DCA3AD961C62F356208552BB9ED529077096966D" \
"670C354E4ABC9804F1746C08CA237327FFFFFFFFFFFFFFFF"
static isc_result_t openssldh_todns(const dst_key_t *key, isc_buffer_t *data);
static BIGNUM bn2, bn768, bn1024, bn1536;
static isc_result_t
openssldh_computesecret(const dst_key_t *pub, const dst_key_t *priv,
isc_buffer_t *secret)
{
DH *dhpub, *dhpriv;
int ret;
isc_region_t r;
unsigned int len;
REQUIRE(pub->opaque != NULL);
REQUIRE(priv->opaque != NULL);
dhpub = (DH *) pub->opaque;
dhpriv = (DH *) priv->opaque;
len = DH_size(dhpriv);
isc_buffer_availableregion(secret, &r);
if (r.length < len)
return (ISC_R_NOSPACE);
ret = DH_compute_key(r.base, dhpub->pub_key, dhpriv);
if (ret == 0)
return (dst__openssl_toresult(DST_R_COMPUTESECRETFAILURE));
isc_buffer_add(secret, len);
return (ISC_R_SUCCESS);
}
static isc_boolean_t
openssldh_compare(const dst_key_t *key1, const dst_key_t *key2) {
int status;
DH *dh1, *dh2;
dh1 = (DH *) key1->opaque;
dh2 = (DH *) key2->opaque;
if (dh1 == NULL && dh2 == NULL)
return (ISC_TRUE);
else if (dh1 == NULL || dh2 == NULL)
return (ISC_FALSE);
status = BN_cmp(dh1->p, dh2->p) ||
BN_cmp(dh1->g, dh2->g) ||
BN_cmp(dh1->pub_key, dh2->pub_key);
if (status != 0)
return (ISC_FALSE);
if (dh1->priv_key != NULL || dh2->priv_key != NULL) {
if (dh1->priv_key == NULL || dh2->priv_key == NULL)
return (ISC_FALSE);
if (BN_cmp(dh1->priv_key, dh2->priv_key) != 0)
return (ISC_FALSE);
}
return (ISC_TRUE);
}
static isc_boolean_t
openssldh_paramcompare(const dst_key_t *key1, const dst_key_t *key2) {
int status;
DH *dh1, *dh2;
dh1 = (DH *) key1->opaque;
dh2 = (DH *) key2->opaque;
if (dh1 == NULL && dh2 == NULL)
return (ISC_TRUE);
else if (dh1 == NULL || dh2 == NULL)
return (ISC_FALSE);
status = BN_cmp(dh1->p, dh2->p) ||
BN_cmp(dh1->g, dh2->g);
if (status != 0)
return (ISC_FALSE);
return (ISC_TRUE);
}
static isc_result_t
openssldh_generate(dst_key_t *key, int generator) {
#if OPENSSL_VERSION_NUMBER > 0x00908000L
BN_GENCB cb;
#endif
DH *dh = NULL;
if (generator == 0) {
if (key->key_size == 768 ||
key->key_size == 1024 ||
key->key_size == 1536)
{
dh = DH_new();
if (dh == NULL)
return (dst__openssl_toresult(ISC_R_NOMEMORY));
if (key->key_size == 768)
dh->p = &bn768;
else if (key->key_size == 1024)
dh->p = &bn1024;
else
dh->p = &bn1536;
dh->g = &bn2;
} else
generator = 2;
}
if (generator != 0) {
#if OPENSSL_VERSION_NUMBER > 0x00908000L
dh = DH_new();
if (dh == NULL)
return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
BN_GENCB_set_old(&cb, NULL, NULL);
if (!DH_generate_parameters_ex(dh, key->key_size, generator,
&cb)) {
DH_free(dh);
return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
}
#else
dh = DH_generate_parameters(key->key_size, generator,
NULL, NULL);
#endif
}
if (dh == NULL)
return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
if (DH_generate_key(dh) == 0) {
DH_free(dh);
return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
}
dh->flags &= ~DH_FLAG_CACHE_MONT_P;
key->opaque = dh;
return (ISC_R_SUCCESS);
}
static isc_boolean_t
openssldh_isprivate(const dst_key_t *key) {
DH *dh = (DH *) key->opaque;
return (ISC_TF(dh != NULL && dh->priv_key != NULL));
}
static void
openssldh_destroy(dst_key_t *key) {
DH *dh = key->opaque;
if (dh == NULL)
return;
if (dh->p == &bn768 || dh->p == &bn1024 || dh->p == &bn1536)
dh->p = NULL;
if (dh->g == &bn2)
dh->g = NULL;
DH_free(dh);
key->opaque = NULL;
}
static void
uint16_toregion(isc_uint16_t val, isc_region_t *region) {
*region->base++ = (val & 0xff00) >> 8;
*region->base++ = (val & 0x00ff);
}
static isc_uint16_t
uint16_fromregion(isc_region_t *region) {
isc_uint16_t val;
unsigned char *cp = region->base;
val = ((unsigned int)(cp[0])) << 8;
val |= ((unsigned int)(cp[1]));
region->base += 2;
return (val);
}
static isc_result_t
openssldh_todns(const dst_key_t *key, isc_buffer_t *data) {
DH *dh;
isc_region_t r;
isc_uint16_t dnslen, plen, glen, publen;
REQUIRE(key->opaque != NULL);
dh = (DH *) key->opaque;
isc_buffer_availableregion(data, &r);
if (dh->g == &bn2 &&
(dh->p == &bn768 || dh->p == &bn1024 || dh->p == &bn1536)) {
plen = 1;
glen = 0;
}
else {
plen = BN_num_bytes(dh->p);
glen = BN_num_bytes(dh->g);
}
publen = BN_num_bytes(dh->pub_key);
dnslen = plen + glen + publen + 6;
if (r.length < (unsigned int) dnslen)
return (ISC_R_NOSPACE);
uint16_toregion(plen, &r);
if (plen == 1) {
if (dh->p == &bn768)
*r.base = 1;
else if (dh->p == &bn1024)
*r.base = 2;
else
*r.base = 3;
}
else
BN_bn2bin(dh->p, r.base);
r.base += plen;
uint16_toregion(glen, &r);
if (glen > 0)
BN_bn2bin(dh->g, r.base);
r.base += glen;
uint16_toregion(publen, &r);
BN_bn2bin(dh->pub_key, r.base);
r.base += publen;
isc_buffer_add(data, dnslen);
return (ISC_R_SUCCESS);
}
static isc_result_t
openssldh_fromdns(dst_key_t *key, isc_buffer_t *data) {
DH *dh;
isc_region_t r;
isc_uint16_t plen, glen, publen;
int special = 0;
isc_buffer_remainingregion(data, &r);
if (r.length == 0)
return (ISC_R_SUCCESS);
dh = DH_new();
if (dh == NULL)
return (dst__openssl_toresult(ISC_R_NOMEMORY));
dh->flags &= ~DH_FLAG_CACHE_MONT_P;
/*
* Read the prime length. 1 & 2 are table entries, > 16 means a
* prime follows, otherwise an error.
*/
if (r.length < 2) {
DH_free(dh);
return (DST_R_INVALIDPUBLICKEY);
}
plen = uint16_fromregion(&r);
if (plen < 16 && plen != 1 && plen != 2) {
DH_free(dh);
return (DST_R_INVALIDPUBLICKEY);
}
if (r.length < plen) {
DH_free(dh);
return (DST_R_INVALIDPUBLICKEY);
}
if (plen == 1 || plen == 2) {
if (plen == 1)
special = *r.base++;
else
special = uint16_fromregion(&r);
switch (special) {
case 1:
dh->p = &bn768;
break;
case 2:
dh->p = &bn1024;
break;
case 3:
dh->p = &bn1536;
break;
default:
DH_free(dh);
return (DST_R_INVALIDPUBLICKEY);
}
}
else {
dh->p = BN_bin2bn(r.base, plen, NULL);
r.base += plen;
}
/*
* Read the generator length. This should be 0 if the prime was
* special, but it might not be. If it's 0 and the prime is not
* special, we have a problem.
*/
if (r.length < 2) {
DH_free(dh);
return (DST_R_INVALIDPUBLICKEY);
}
glen = uint16_fromregion(&r);
if (r.length < glen) {
DH_free(dh);
return (DST_R_INVALIDPUBLICKEY);
}
if (special != 0) {
if (glen == 0)
dh->g = &bn2;
else {
dh->g = BN_bin2bn(r.base, glen, NULL);
if (BN_cmp(dh->g, &bn2) == 0) {
BN_free(dh->g);
dh->g = &bn2;
}
else {
DH_free(dh);
return (DST_R_INVALIDPUBLICKEY);
}
}
}
else {
if (glen == 0) {
DH_free(dh);
return (DST_R_INVALIDPUBLICKEY);
}
dh->g = BN_bin2bn(r.base, glen, NULL);
}
r.base += glen;
if (r.length < 2) {
DH_free(dh);
return (DST_R_INVALIDPUBLICKEY);
}
publen = uint16_fromregion(&r);
if (r.length < publen) {
DH_free(dh);
return (DST_R_INVALIDPUBLICKEY);
}
dh->pub_key = BN_bin2bn(r.base, publen, NULL);
r.base += publen;
key->key_size = BN_num_bits(dh->p);
isc_buffer_forward(data, plen + glen + publen + 6);
key->opaque = (void *) dh;
return (ISC_R_SUCCESS);
}
static isc_result_t
openssldh_tofile(const dst_key_t *key, const char *directory) {
int i;
DH *dh;
dst_private_t priv;
unsigned char *bufs[4];
isc_result_t result;
if (key->opaque == NULL)
return (DST_R_NULLKEY);
dh = (DH *) key->opaque;
for (i = 0; i < 4; i++) {
bufs[i] = isc_mem_get(key->mctx, BN_num_bytes(dh->p));
if (bufs[i] == NULL) {
result = ISC_R_NOMEMORY;
goto fail;
}
}
i = 0;
priv.elements[i].tag = TAG_DH_PRIME;
priv.elements[i].length = BN_num_bytes(dh->p);
BN_bn2bin(dh->p, bufs[i]);
priv.elements[i].data = bufs[i];
i++;
priv.elements[i].tag = TAG_DH_GENERATOR;
priv.elements[i].length = BN_num_bytes(dh->g);
BN_bn2bin(dh->g, bufs[i]);
priv.elements[i].data = bufs[i];
i++;
priv.elements[i].tag = TAG_DH_PRIVATE;
priv.elements[i].length = BN_num_bytes(dh->priv_key);
BN_bn2bin(dh->priv_key, bufs[i]);
priv.elements[i].data = bufs[i];
i++;
priv.elements[i].tag = TAG_DH_PUBLIC;
priv.elements[i].length = BN_num_bytes(dh->pub_key);
BN_bn2bin(dh->pub_key, bufs[i]);
priv.elements[i].data = bufs[i];
i++;
priv.nelements = i;
result = dst__privstruct_writefile(key, &priv, directory);
fail:
for (i = 0; i < 4; i++) {
if (bufs[i] == NULL)
break;
isc_mem_put(key->mctx, bufs[i], BN_num_bytes(dh->p));
}
return (result);
}
static isc_result_t
openssldh_parse(dst_key_t *key, isc_lex_t *lexer) {
dst_private_t priv;
isc_result_t ret;
int i;
DH *dh = NULL;
isc_mem_t *mctx;
#define DST_RET(a) {ret = a; goto err;}
mctx = key->mctx;
/* read private key file */
ret = dst__privstruct_parse(key, DST_ALG_DH, lexer, mctx, &priv);
if (ret != ISC_R_SUCCESS)
return (ret);
dh = DH_new();
if (dh == NULL)
DST_RET(ISC_R_NOMEMORY);
dh->flags &= ~DH_FLAG_CACHE_MONT_P;
key->opaque = dh;
for (i = 0; i < priv.nelements; i++) {
BIGNUM *bn;
bn = BN_bin2bn(priv.elements[i].data,
priv.elements[i].length, NULL);
if (bn == NULL)
DST_RET(ISC_R_NOMEMORY);
switch (priv.elements[i].tag) {
case TAG_DH_PRIME:
dh->p = bn;
break;
case TAG_DH_GENERATOR:
dh->g = bn;
break;
case TAG_DH_PRIVATE:
dh->priv_key = bn;
break;
case TAG_DH_PUBLIC:
dh->pub_key = bn;
break;
}
}
dst__privstruct_free(&priv, mctx);
key->key_size = BN_num_bits(dh->p);
if ((key->key_size == 768 ||
key->key_size == 1024 ||
key->key_size == 1536) &&
BN_cmp(dh->g, &bn2) == 0)
{
if (key->key_size == 768 && BN_cmp(dh->p, &bn768) == 0) {
BN_free(dh->p);
BN_free(dh->g);
dh->p = &bn768;
dh->g = &bn2;
} else if (key->key_size == 1024 &&
BN_cmp(dh->p, &bn1024) == 0) {
BN_free(dh->p);
BN_free(dh->g);
dh->p = &bn1024;
dh->g = &bn2;
} else if (key->key_size == 1536 &&
BN_cmp(dh->p, &bn1536) == 0) {
BN_free(dh->p);
BN_free(dh->g);
dh->p = &bn1536;
dh->g = &bn2;
}
}
return (ISC_R_SUCCESS);
err:
openssldh_destroy(key);
dst__privstruct_free(&priv, mctx);
memset(&priv, 0, sizeof(priv));
return (ret);
}
static void
BN_fromhex(BIGNUM *b, const char *str) {
static const char hexdigits[] = "0123456789abcdef";
unsigned char data[512];
unsigned int i;
BIGNUM *out;
RUNTIME_CHECK(strlen(str) < 1024U && strlen(str) % 2 == 0U);
for (i = 0; i < strlen(str); i += 2) {
char *s;
unsigned int high, low;
s = strchr(hexdigits, tolower((unsigned char)str[i]));
RUNTIME_CHECK(s != NULL);
high = s - hexdigits;
s = strchr(hexdigits, tolower((unsigned char)str[i + 1]));
RUNTIME_CHECK(s != NULL);
low = s - hexdigits;
data[i/2] = (unsigned char)((high << 4) + low);
}
out = BN_bin2bn(data, strlen(str)/2, b);
RUNTIME_CHECK(out != NULL);
}
static void
openssldh_cleanup(void) {
BN_free(&bn2);
BN_free(&bn768);
BN_free(&bn1024);
BN_free(&bn1536);
}
static dst_func_t openssldh_functions = {
NULL, /*%< createctx */
NULL, /*%< destroyctx */
NULL, /*%< adddata */
NULL, /*%< openssldh_sign */
NULL, /*%< openssldh_verify */
openssldh_computesecret,
openssldh_compare,
openssldh_paramcompare,
openssldh_generate,
openssldh_isprivate,
openssldh_destroy,
openssldh_todns,
openssldh_fromdns,
openssldh_tofile,
openssldh_parse,
openssldh_cleanup,
};
isc_result_t
dst__openssldh_init(dst_func_t **funcp) {
REQUIRE(funcp != NULL);
if (*funcp == NULL) {
BN_init(&bn2);
BN_init(&bn768);
BN_init(&bn1024);
BN_init(&bn1536);
BN_set_word(&bn2, 2);
BN_fromhex(&bn768, PRIME768);
BN_fromhex(&bn1024, PRIME1024);
BN_fromhex(&bn1536, PRIME1536);
*funcp = &openssldh_functions;
}
return (ISC_R_SUCCESS);
}
#else /* OPENSSL */
#include <isc/util.h>
EMPTY_TRANSLATION_UNIT
#endif /* OPENSSL */
/*! \file */
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