465 lines
11 KiB
C
465 lines
11 KiB
C
/* $NetBSD: openssldsa_link.c,v 1.1.1.2 2007/01/27 21:06:45 christos Exp $ */
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/*
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* Portions Copyright (C) 2004-2007 Internet Systems Consortium, Inc. ("ISC")
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* Portions Copyright (C) 1999-2002 Internet Software Consortium.
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* Portions Copyright (C) 1995-2000 by Network Associates, Inc.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NETWORK ASSOCIATES DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE
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* FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
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* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Id: openssldsa_link.c,v 1.1.6.8 2007/01/08 03:03:48 marka Exp */
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#ifdef OPENSSL
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#include <config.h>
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#include <string.h>
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#include <isc/entropy.h>
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#include <isc/mem.h>
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#include <isc/sha1.h>
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#include <isc/util.h>
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#include <dst/result.h>
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#include "dst_internal.h"
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#include "dst_openssl.h"
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#include "dst_parse.h"
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#include <openssl/dsa.h>
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static isc_result_t openssldsa_todns(const dst_key_t *key, isc_buffer_t *data);
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static isc_result_t
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openssldsa_createctx(dst_key_t *key, dst_context_t *dctx) {
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isc_sha1_t *sha1ctx;
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UNUSED(key);
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sha1ctx = isc_mem_get(dctx->mctx, sizeof(isc_sha1_t));
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isc_sha1_init(sha1ctx);
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dctx->opaque = sha1ctx;
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return (ISC_R_SUCCESS);
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}
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static void
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openssldsa_destroyctx(dst_context_t *dctx) {
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isc_sha1_t *sha1ctx = dctx->opaque;
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if (sha1ctx != NULL) {
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isc_sha1_invalidate(sha1ctx);
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isc_mem_put(dctx->mctx, sha1ctx, sizeof(isc_sha1_t));
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dctx->opaque = NULL;
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}
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}
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static isc_result_t
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openssldsa_adddata(dst_context_t *dctx, const isc_region_t *data) {
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isc_sha1_t *sha1ctx = dctx->opaque;
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isc_sha1_update(sha1ctx, data->base, data->length);
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return (ISC_R_SUCCESS);
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}
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static int
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BN_bn2bin_fixed(BIGNUM *bn, unsigned char *buf, int size) {
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int bytes = size - BN_num_bytes(bn);
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while (bytes-- > 0)
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*buf++ = 0;
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BN_bn2bin(bn, buf);
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return (size);
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}
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static isc_result_t
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openssldsa_sign(dst_context_t *dctx, isc_buffer_t *sig) {
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isc_sha1_t *sha1ctx = dctx->opaque;
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dst_key_t *key = dctx->key;
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DSA *dsa = key->opaque;
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DSA_SIG *dsasig;
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isc_region_t r;
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unsigned char digest[ISC_SHA1_DIGESTLENGTH];
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isc_buffer_availableregion(sig, &r);
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if (r.length < ISC_SHA1_DIGESTLENGTH * 2 + 1)
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return (ISC_R_NOSPACE);
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isc_sha1_final(sha1ctx, digest);
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dsasig = DSA_do_sign(digest, ISC_SHA1_DIGESTLENGTH, dsa);
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if (dsasig == NULL)
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return (dst__openssl_toresult(DST_R_SIGNFAILURE));
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*r.base++ = (key->key_size - 512)/64;
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BN_bn2bin_fixed(dsasig->r, r.base, ISC_SHA1_DIGESTLENGTH);
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r.base += ISC_SHA1_DIGESTLENGTH;
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BN_bn2bin_fixed(dsasig->s, r.base, ISC_SHA1_DIGESTLENGTH);
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r.base += ISC_SHA1_DIGESTLENGTH;
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DSA_SIG_free(dsasig);
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isc_buffer_add(sig, ISC_SHA1_DIGESTLENGTH * 2 + 1);
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return (ISC_R_SUCCESS);
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}
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static isc_result_t
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openssldsa_verify(dst_context_t *dctx, const isc_region_t *sig) {
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isc_sha1_t *sha1ctx = dctx->opaque;
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dst_key_t *key = dctx->key;
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DSA *dsa = key->opaque;
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DSA_SIG *dsasig;
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int status = 0;
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unsigned char digest[ISC_SHA1_DIGESTLENGTH];
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unsigned char *cp = sig->base;
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isc_sha1_final(sha1ctx, digest);
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if (sig->length < 2 * ISC_SHA1_DIGESTLENGTH + 1)
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return (DST_R_VERIFYFAILURE);
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cp++; /*%< Skip T */
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dsasig = DSA_SIG_new();
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dsasig->r = BN_bin2bn(cp, ISC_SHA1_DIGESTLENGTH, NULL);
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cp += ISC_SHA1_DIGESTLENGTH;
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dsasig->s = BN_bin2bn(cp, ISC_SHA1_DIGESTLENGTH, NULL);
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cp += ISC_SHA1_DIGESTLENGTH;
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status = DSA_do_verify(digest, ISC_SHA1_DIGESTLENGTH, dsasig, dsa);
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DSA_SIG_free(dsasig);
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if (status == 0)
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return (dst__openssl_toresult(DST_R_VERIFYFAILURE));
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return (ISC_R_SUCCESS);
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}
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static isc_boolean_t
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openssldsa_compare(const dst_key_t *key1, const dst_key_t *key2) {
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int status;
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DSA *dsa1, *dsa2;
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dsa1 = (DSA *) key1->opaque;
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dsa2 = (DSA *) key2->opaque;
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if (dsa1 == NULL && dsa2 == NULL)
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return (ISC_TRUE);
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else if (dsa1 == NULL || dsa2 == NULL)
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return (ISC_FALSE);
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status = BN_cmp(dsa1->p, dsa2->p) ||
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BN_cmp(dsa1->q, dsa2->q) ||
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BN_cmp(dsa1->g, dsa2->g) ||
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BN_cmp(dsa1->pub_key, dsa2->pub_key);
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if (status != 0)
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return (ISC_FALSE);
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if (dsa1->priv_key != NULL || dsa2->priv_key != NULL) {
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if (dsa1->priv_key == NULL || dsa2->priv_key == NULL)
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return (ISC_FALSE);
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if (BN_cmp(dsa1->priv_key, dsa2->priv_key))
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return (ISC_FALSE);
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}
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return (ISC_TRUE);
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}
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static isc_result_t
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openssldsa_generate(dst_key_t *key, int unused) {
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#if OPENSSL_VERSION_NUMBER > 0x00908000L
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BN_GENCB cb;
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#endif
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DSA *dsa;
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unsigned char rand_array[ISC_SHA1_DIGESTLENGTH];
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isc_result_t result;
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UNUSED(unused);
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result = dst__entropy_getdata(rand_array, sizeof(rand_array),
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ISC_FALSE);
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if (result != ISC_R_SUCCESS)
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return (result);
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#if OPENSSL_VERSION_NUMBER > 0x00908000L
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dsa = DSA_new();
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if (dsa == NULL)
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return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
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BN_GENCB_set_old(&cb, NULL, NULL);
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if (!DSA_generate_parameters_ex(dsa, key->key_size, rand_array,
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ISC_SHA1_DIGESTLENGTH, NULL, NULL,
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&cb))
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{
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DSA_free(dsa);
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return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
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}
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#else
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dsa = DSA_generate_parameters(key->key_size, rand_array,
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ISC_SHA1_DIGESTLENGTH, NULL, NULL,
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NULL, NULL);
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if (dsa == NULL)
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return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
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#endif
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if (DSA_generate_key(dsa) == 0) {
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DSA_free(dsa);
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return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
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}
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dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
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key->opaque = dsa;
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return (ISC_R_SUCCESS);
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}
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static isc_boolean_t
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openssldsa_isprivate(const dst_key_t *key) {
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DSA *dsa = (DSA *) key->opaque;
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return (ISC_TF(dsa != NULL && dsa->priv_key != NULL));
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}
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static void
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openssldsa_destroy(dst_key_t *key) {
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DSA *dsa = key->opaque;
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DSA_free(dsa);
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key->opaque = NULL;
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}
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static isc_result_t
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openssldsa_todns(const dst_key_t *key, isc_buffer_t *data) {
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DSA *dsa;
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isc_region_t r;
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int dnslen;
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unsigned int t, p_bytes;
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REQUIRE(key->opaque != NULL);
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dsa = (DSA *) key->opaque;
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isc_buffer_availableregion(data, &r);
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t = (BN_num_bytes(dsa->p) - 64) / 8;
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if (t > 8)
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return (DST_R_INVALIDPUBLICKEY);
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p_bytes = 64 + 8 * t;
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dnslen = 1 + (key->key_size * 3)/8 + ISC_SHA1_DIGESTLENGTH;
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if (r.length < (unsigned int) dnslen)
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return (ISC_R_NOSPACE);
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*r.base++ = t;
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BN_bn2bin_fixed(dsa->q, r.base, ISC_SHA1_DIGESTLENGTH);
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r.base += ISC_SHA1_DIGESTLENGTH;
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BN_bn2bin_fixed(dsa->p, r.base, key->key_size/8);
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r.base += p_bytes;
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BN_bn2bin_fixed(dsa->g, r.base, key->key_size/8);
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r.base += p_bytes;
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BN_bn2bin_fixed(dsa->pub_key, r.base, key->key_size/8);
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r.base += p_bytes;
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isc_buffer_add(data, dnslen);
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return (ISC_R_SUCCESS);
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}
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static isc_result_t
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openssldsa_fromdns(dst_key_t *key, isc_buffer_t *data) {
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DSA *dsa;
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isc_region_t r;
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unsigned int t, p_bytes;
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isc_mem_t *mctx = key->mctx;
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UNUSED(mctx);
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isc_buffer_remainingregion(data, &r);
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if (r.length == 0)
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return (ISC_R_SUCCESS);
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dsa = DSA_new();
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if (dsa == NULL)
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return (ISC_R_NOMEMORY);
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dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
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t = (unsigned int) *r.base++;
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if (t > 8) {
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DSA_free(dsa);
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return (DST_R_INVALIDPUBLICKEY);
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}
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p_bytes = 64 + 8 * t;
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if (r.length < 1 + ISC_SHA1_DIGESTLENGTH + 3 * p_bytes) {
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DSA_free(dsa);
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return (DST_R_INVALIDPUBLICKEY);
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}
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dsa->q = BN_bin2bn(r.base, ISC_SHA1_DIGESTLENGTH, NULL);
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r.base += ISC_SHA1_DIGESTLENGTH;
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dsa->p = BN_bin2bn(r.base, p_bytes, NULL);
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r.base += p_bytes;
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dsa->g = BN_bin2bn(r.base, p_bytes, NULL);
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r.base += p_bytes;
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dsa->pub_key = BN_bin2bn(r.base, p_bytes, NULL);
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r.base += p_bytes;
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key->key_size = p_bytes * 8;
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isc_buffer_forward(data, 1 + ISC_SHA1_DIGESTLENGTH + 3 * p_bytes);
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key->opaque = (void *) dsa;
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return (ISC_R_SUCCESS);
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}
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static isc_result_t
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openssldsa_tofile(const dst_key_t *key, const char *directory) {
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int cnt = 0;
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DSA *dsa;
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dst_private_t priv;
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unsigned char bufs[5][128];
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if (key->opaque == NULL)
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return (DST_R_NULLKEY);
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dsa = (DSA *) key->opaque;
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priv.elements[cnt].tag = TAG_DSA_PRIME;
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priv.elements[cnt].length = BN_num_bytes(dsa->p);
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BN_bn2bin(dsa->p, bufs[cnt]);
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priv.elements[cnt].data = bufs[cnt];
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cnt++;
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priv.elements[cnt].tag = TAG_DSA_SUBPRIME;
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priv.elements[cnt].length = BN_num_bytes(dsa->q);
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BN_bn2bin(dsa->q, bufs[cnt]);
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priv.elements[cnt].data = bufs[cnt];
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cnt++;
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priv.elements[cnt].tag = TAG_DSA_BASE;
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priv.elements[cnt].length = BN_num_bytes(dsa->g);
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BN_bn2bin(dsa->g, bufs[cnt]);
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priv.elements[cnt].data = bufs[cnt];
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cnt++;
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priv.elements[cnt].tag = TAG_DSA_PRIVATE;
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priv.elements[cnt].length = BN_num_bytes(dsa->priv_key);
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BN_bn2bin(dsa->priv_key, bufs[cnt]);
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priv.elements[cnt].data = bufs[cnt];
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cnt++;
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priv.elements[cnt].tag = TAG_DSA_PUBLIC;
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priv.elements[cnt].length = BN_num_bytes(dsa->pub_key);
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BN_bn2bin(dsa->pub_key, bufs[cnt]);
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priv.elements[cnt].data = bufs[cnt];
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cnt++;
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priv.nelements = cnt;
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return (dst__privstruct_writefile(key, &priv, directory));
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}
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static isc_result_t
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openssldsa_parse(dst_key_t *key, isc_lex_t *lexer) {
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dst_private_t priv;
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isc_result_t ret;
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int i;
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DSA *dsa = NULL;
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isc_mem_t *mctx = key->mctx;
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#define DST_RET(a) {ret = a; goto err;}
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/* read private key file */
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ret = dst__privstruct_parse(key, DST_ALG_DSA, lexer, mctx, &priv);
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if (ret != ISC_R_SUCCESS)
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return (ret);
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dsa = DSA_new();
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if (dsa == NULL)
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DST_RET(ISC_R_NOMEMORY);
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dsa->flags &= ~DSA_FLAG_CACHE_MONT_P;
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key->opaque = dsa;
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for (i=0; i < priv.nelements; i++) {
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BIGNUM *bn;
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bn = BN_bin2bn(priv.elements[i].data,
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priv.elements[i].length, NULL);
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if (bn == NULL)
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DST_RET(ISC_R_NOMEMORY);
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switch (priv.elements[i].tag) {
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case TAG_DSA_PRIME:
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dsa->p = bn;
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break;
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case TAG_DSA_SUBPRIME:
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dsa->q = bn;
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break;
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case TAG_DSA_BASE:
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dsa->g = bn;
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break;
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case TAG_DSA_PRIVATE:
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dsa->priv_key = bn;
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break;
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case TAG_DSA_PUBLIC:
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dsa->pub_key = bn;
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break;
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}
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}
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dst__privstruct_free(&priv, mctx);
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key->key_size = BN_num_bits(dsa->p);
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return (ISC_R_SUCCESS);
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err:
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openssldsa_destroy(key);
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dst__privstruct_free(&priv, mctx);
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memset(&priv, 0, sizeof(priv));
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return (ret);
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}
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static dst_func_t openssldsa_functions = {
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openssldsa_createctx,
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openssldsa_destroyctx,
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openssldsa_adddata,
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openssldsa_sign,
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openssldsa_verify,
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NULL, /*%< computesecret */
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openssldsa_compare,
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NULL, /*%< paramcompare */
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openssldsa_generate,
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openssldsa_isprivate,
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openssldsa_destroy,
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openssldsa_todns,
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openssldsa_fromdns,
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openssldsa_tofile,
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openssldsa_parse,
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NULL, /*%< cleanup */
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};
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isc_result_t
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dst__openssldsa_init(dst_func_t **funcp) {
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REQUIRE(funcp != NULL);
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if (*funcp == NULL)
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*funcp = &openssldsa_functions;
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return (ISC_R_SUCCESS);
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}
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#else /* OPENSSL */
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#include <isc/util.h>
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EMPTY_TRANSLATION_UNIT
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#endif /* OPENSSL */
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/*! \file */
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