opensslgost_link.c

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/*
 * Copyright (C) 2010-2014  Internet Systems Consortium, Inc. ("ISC")
 *
 * 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 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.
 */

/* $Id: opensslgost_link.c,v 1.5 2011/01/19 23:47:12 tbox Exp $ */

#include <config.h>

#if defined(OPENSSL) && defined(HAVE_OPENSSL_GOST)

#include <isc/entropy.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 "dst_gost.h"

#include <openssl/err.h>
#include <openssl/objects.h>
#include <openssl/rsa.h>
#include <openssl/engine.h>

static ENGINE *e = NULL;
static const EVP_MD *opensslgost_digest;
extern const EVP_MD *EVP_gost(void);

const EVP_MD *EVP_gost(void) {
        return (opensslgost_digest);
}

/* ISC methods */

isc_result_t
isc_gost_init(isc_gost_t *ctx) {
        const EVP_MD *md;
        int ret;

        INSIST(ctx != NULL);

        md = EVP_gost();
        if (md == NULL)
                return (DST_R_CRYPTOFAILURE);
        EVP_MD_CTX_init(ctx);
        ret = EVP_DigestInit(ctx, md);
        if (ret != 1)
                return (DST_R_CRYPTOFAILURE);
        return (ISC_R_SUCCESS);
}

void
isc_gost_invalidate(isc_gost_t *ctx) {
        EVP_MD_CTX_cleanup(ctx);
}

isc_result_t
isc_gost_update(isc_gost_t *ctx, const unsigned char *data,
                unsigned int len)
{
        int ret;

        INSIST(ctx != NULL);
        INSIST(data != NULL);

        ret = EVP_DigestUpdate(ctx, (const void *) data, (size_t) len);
        if (ret != 1)
                return (DST_R_CRYPTOFAILURE);
        return (ISC_R_SUCCESS);
}

isc_result_t
isc_gost_final(isc_gost_t *ctx, unsigned char *digest) {
        int ret;

        INSIST(ctx != NULL);
        INSIST(digest != NULL);

        ret = EVP_DigestFinal(ctx, digest, NULL);
        if (ret != 1)
                return (DST_R_CRYPTOFAILURE);
        return (ISC_R_SUCCESS);
}

/* DST methods */

#define DST_RET(a) {ret = a; goto err;}

static isc_result_t opensslgost_todns(const dst_key_t *key,
                                      isc_buffer_t *data);

static isc_result_t
opensslgost_createctx(dst_key_t *key, dst_context_t *dctx) {
        EVP_MD_CTX *evp_md_ctx;
        const EVP_MD *md = EVP_gost();

        UNUSED(key);

        if (md == NULL)
                return (DST_R_OPENSSLFAILURE);

        evp_md_ctx = EVP_MD_CTX_create();
        if (evp_md_ctx == NULL)
                return (ISC_R_NOMEMORY);

        if (!EVP_DigestInit_ex(evp_md_ctx, md, NULL)) {
                EVP_MD_CTX_destroy(evp_md_ctx);
                return (ISC_R_FAILURE);
        }
        dctx->ctxdata.evp_md_ctx = evp_md_ctx;

        return (ISC_R_SUCCESS);
}

static void
opensslgost_destroyctx(dst_context_t *dctx) {
        EVP_MD_CTX *evp_md_ctx = dctx->ctxdata.evp_md_ctx;

        if (evp_md_ctx != NULL) {
                EVP_MD_CTX_destroy(evp_md_ctx);
                dctx->ctxdata.evp_md_ctx = NULL;
        }
}

static isc_result_t
opensslgost_adddata(dst_context_t *dctx, const isc_region_t *data) {
        EVP_MD_CTX *evp_md_ctx = dctx->ctxdata.evp_md_ctx;

        if (!EVP_DigestUpdate(evp_md_ctx, data->base, data->length))
                return (ISC_R_FAILURE);

        return (ISC_R_SUCCESS);
}

static isc_result_t
opensslgost_sign(dst_context_t *dctx, isc_buffer_t *sig) {
        dst_key_t *key = dctx->key;
        isc_region_t r;
        unsigned int siglen = 0;
        EVP_MD_CTX *evp_md_ctx = dctx->ctxdata.evp_md_ctx;
        EVP_PKEY *pkey = key->keydata.pkey;

        isc_buffer_availableregion(sig, &r);

        if (r.length < (unsigned int) EVP_PKEY_size(pkey))
                return (ISC_R_NOSPACE);

        if (!EVP_SignFinal(evp_md_ctx, r.base, &siglen, pkey))
                return (ISC_R_FAILURE);

        isc_buffer_add(sig, siglen);

        return (ISC_R_SUCCESS);
}

static isc_result_t
opensslgost_verify(dst_context_t *dctx, const isc_region_t *sig) {
        dst_key_t *key = dctx->key;
        int status = 0;
        EVP_MD_CTX *evp_md_ctx = dctx->ctxdata.evp_md_ctx;
        EVP_PKEY *pkey = key->keydata.pkey;

        status = EVP_VerifyFinal(evp_md_ctx, sig->base, sig->length, pkey);
        switch (status) {
        case 1:
                return (ISC_R_SUCCESS);
        case 0:
                return (dst__openssl_toresult(DST_R_VERIFYFAILURE));
        default:
                return (dst__openssl_toresult3(dctx->category,
                                               "EVP_VerifyFinal",
                                               DST_R_VERIFYFAILURE));
        }
}

static isc_boolean_t
opensslgost_compare(const dst_key_t *key1, const dst_key_t *key2) {
        EVP_PKEY *pkey1, *pkey2;

        pkey1 = key1->keydata.pkey;
        pkey2 = key2->keydata.pkey;

        if (pkey1 == NULL && pkey2 == NULL)
                return (ISC_TRUE);
        else if (pkey1 == NULL || pkey2 == NULL)
                return (ISC_FALSE);

        if (EVP_PKEY_cmp(pkey1, pkey2) != 1)
                return (ISC_FALSE);
        return (ISC_TRUE);
}

static int
progress_cb(EVP_PKEY_CTX *ctx)
{
        union {
                void *dptr;
                void (*fptr)(int);
        } u;
        int p;

        u.dptr = EVP_PKEY_CTX_get_app_data(ctx);
        p = EVP_PKEY_CTX_get_keygen_info(ctx, 0);
        if (u.fptr != NULL)
                u.fptr(p);
        return (1);
}

static isc_result_t
opensslgost_generate(dst_key_t *key, int unused, void (*callback)(int)) {
        EVP_PKEY_CTX *ctx;
        union {
                void *dptr;
                void (*fptr)(int);
        } u;
        EVP_PKEY *pkey = NULL;
        isc_result_t ret;

        UNUSED(unused);
        ctx = EVP_PKEY_CTX_new_id(NID_id_GostR3410_2001, NULL);
        if (ctx == NULL)
                DST_RET(dst__openssl_toresult2("EVP_PKEY_CTX_new_id",
                                               DST_R_OPENSSLFAILURE));
        if (callback != NULL) {
                u.fptr = callback;
                EVP_PKEY_CTX_set_app_data(ctx, u.dptr);
                EVP_PKEY_CTX_set_cb(ctx, &progress_cb);
        }
        if (EVP_PKEY_keygen_init(ctx) <= 0)
                DST_RET(dst__openssl_toresult2("EVP_PKEY_keygen_init",
                                               DST_R_OPENSSLFAILURE));
        if (EVP_PKEY_CTX_ctrl_str(ctx, "paramset", "A") <= 0)
                DST_RET(dst__openssl_toresult2("EVP_PKEY_CTX_ctrl_str",
                                               DST_R_OPENSSLFAILURE));
        if (EVP_PKEY_keygen(ctx, &pkey) <= 0)
                DST_RET(dst__openssl_toresult2("EVP_PKEY_keygen",
                                               DST_R_OPENSSLFAILURE));
        key->keydata.pkey = pkey;
        key->key_size = EVP_PKEY_bits(pkey);
        EVP_PKEY_CTX_free(ctx);
        return (ISC_R_SUCCESS);

err:
        if (pkey != NULL)
                EVP_PKEY_free(pkey);
        if (ctx != NULL)
                EVP_PKEY_CTX_free(ctx);
        return (ret);
}

static isc_boolean_t
opensslgost_isprivate(const dst_key_t *key) {
        EVP_PKEY *pkey = key->keydata.pkey;
        EC_KEY *ec;

        INSIST(pkey != NULL);

        ec = EVP_PKEY_get0(pkey);
        return (ISC_TF(ec != NULL && EC_KEY_get0_private_key(ec) != NULL));
}

static void
opensslgost_destroy(dst_key_t *key) {
        EVP_PKEY *pkey = key->keydata.pkey;

        EVP_PKEY_free(pkey);
        key->keydata.pkey = NULL;
}

unsigned char gost_prefix[37] = {
        0x30, 0x63, 0x30, 0x1c, 0x06, 0x06, 0x2a, 0x85,
        0x03, 0x02, 0x02, 0x13, 0x30, 0x12, 0x06, 0x07,
        0x2a, 0x85, 0x03, 0x02, 0x02, 0x23, 0x01, 0x06,
        0x07, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x1e, 0x01,
        0x03, 0x43, 0x00, 0x04, 0x40
};

static isc_result_t
opensslgost_todns(const dst_key_t *key, isc_buffer_t *data) {
        EVP_PKEY *pkey;
        isc_region_t r;
        unsigned char der[37 + 64], *p;
        int len;

        REQUIRE(key->keydata.pkey != NULL);

        pkey = key->keydata.pkey;

        isc_buffer_availableregion(data, &r);
        if (r.length < 64)
                return (ISC_R_NOSPACE);

        p = der;
        len = i2d_PUBKEY(pkey, &p);
        INSIST(len == sizeof(der));
        INSIST(memcmp(gost_prefix, der, 37) == 0);
        memmove(r.base, der + 37, 64);
        isc_buffer_add(data, 64);

        return (ISC_R_SUCCESS);
}

static isc_result_t
opensslgost_fromdns(dst_key_t *key, isc_buffer_t *data) {
        isc_region_t r;
        EVP_PKEY *pkey = NULL;
        unsigned char der[37 + 64];
        const unsigned char *p;

        isc_buffer_remainingregion(data, &r);
        if (r.length == 0)
                return (ISC_R_SUCCESS);

        if (r.length != 64)
                return (DST_R_INVALIDPUBLICKEY);
        memmove(der, gost_prefix, 37);
        memmove(der + 37, r.base, 64);
        isc_buffer_forward(data, 64);

        p = der;
        if (d2i_PUBKEY(&pkey, &p, (long) sizeof(der)) == NULL)
                return (dst__openssl_toresult2("d2i_PUBKEY",
                                               DST_R_OPENSSLFAILURE));
        key->keydata.pkey = pkey;
        key->key_size = EVP_PKEY_bits(pkey);

        return (ISC_R_SUCCESS);
}

#ifdef PREFER_GOSTASN1

static isc_result_t
opensslgost_tofile(const dst_key_t *key, const char *directory) {
        EVP_PKEY *pkey;
        dst_private_t priv;
        isc_result_t result;
        unsigned char *der, *p;
        int len;

        if (key->keydata.pkey == NULL)
                return (DST_R_NULLKEY);

        if (key->external) {
                priv.nelements = 0;
                return (dst__privstruct_writefile(key, &priv, directory));
        }

        pkey = key->keydata.pkey;

        len = i2d_PrivateKey(pkey, NULL);
        der = isc_mem_get(key->mctx, (size_t) len);
        if (der == NULL)
                return (ISC_R_NOMEMORY);

        p = der;
        if (i2d_PrivateKey(pkey, &p) != len) {
                result = dst__openssl_toresult2("i2d_PrivateKey",
                                                DST_R_OPENSSLFAILURE);
                goto fail;
        }

        priv.elements[0].tag = TAG_GOST_PRIVASN1;
        priv.elements[0].length = len;
        priv.elements[0].data = der;
        priv.nelements = 1;

        result = dst__privstruct_writefile(key, &priv, directory);
 fail:
        if (der != NULL)
                isc_mem_put(key->mctx, der, (size_t) len);
        return (result);
}

#else

static isc_result_t
opensslgost_tofile(const dst_key_t *key, const char *directory) {
        EVP_PKEY *pkey;
        EC_KEY *eckey;
        const BIGNUM *privkey;
        dst_private_t priv;
        isc_result_t ret;
        unsigned char *buf = NULL;

        if (key->keydata.pkey == NULL)
                return (DST_R_NULLKEY);

        if (key->external) {
                priv.nelements = 0;
                return (dst__privstruct_writefile(key, &priv, directory));
        }

        pkey = key->keydata.pkey;
        eckey = EVP_PKEY_get0(pkey);
        if (eckey == NULL)
                return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
        privkey = EC_KEY_get0_private_key(eckey);
        if (privkey == NULL)
                return (ISC_R_FAILURE);

        buf = isc_mem_get(key->mctx, BN_num_bytes(privkey));
        if (buf == NULL)
                return (ISC_R_NOMEMORY);

        priv.elements[0].tag = TAG_GOST_PRIVRAW;
        priv.elements[0].length = BN_num_bytes(privkey);
        BN_bn2bin(privkey, buf);
        priv.elements[0].data = buf;
        priv.nelements = 1;

        ret = dst__privstruct_writefile(key, &priv, directory);

        if (buf != NULL)
                isc_mem_put(key->mctx, buf, BN_num_bytes(privkey));
        return (ret);
}
#endif

static unsigned char gost_dummy_key[71] = {
        0x30, 0x45, 0x02, 0x01, 0x00, 0x30, 0x1c, 0x06,
        0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x13, 0x30,
        0x12, 0x06, 0x07, 0x2a, 0x85, 0x03, 0x02, 0x02,
        0x23, 0x01, 0x06, 0x07, 0x2a, 0x85, 0x03, 0x02,
        0x02, 0x1e, 0x01, 0x04, 0x22, 0x02, 0x20, 0x1b,
        0x3f, 0x94, 0xf7, 0x1a, 0x5f, 0x2f, 0xe7, 0xe5,
        0x74, 0x0b, 0x8c, 0xd4, 0xb7, 0x18, 0xdd, 0x65,
        0x68, 0x26, 0xd1, 0x54, 0xfb, 0x77, 0xba, 0x63,
        0x72, 0xd9, 0xf0, 0x63, 0x87, 0xe0, 0xd6
};

static isc_result_t
opensslgost_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) {
        dst_private_t priv;
        isc_result_t ret;
        isc_mem_t *mctx = key->mctx;
        EVP_PKEY *pkey = NULL;
        EC_KEY *eckey;
        const EC_POINT *pubkey = NULL;
        BIGNUM *privkey = NULL;
        const unsigned char *p;

        /* read private key file */
        ret = dst__privstruct_parse(key, DST_ALG_ECCGOST, lexer, mctx, &priv);
        if (ret != ISC_R_SUCCESS)
                return (ret);

        if (key->external) {
                if (priv.nelements != 0)
                        DST_RET(DST_R_INVALIDPRIVATEKEY);
                if (pub == NULL)
                        DST_RET(DST_R_INVALIDPRIVATEKEY);
                key->keydata.pkey = pub->keydata.pkey;
                pub->keydata.pkey = NULL;
                key->key_size = pub->key_size;
                dst__privstruct_free(&priv, mctx);
                memset(&priv, 0, sizeof(priv));
                return (ISC_R_SUCCESS);
        }

        INSIST((priv.elements[0].tag == TAG_GOST_PRIVASN1) ||
               (priv.elements[0].tag == TAG_GOST_PRIVRAW));

        if (priv.elements[0].tag == TAG_GOST_PRIVASN1) {
                p = priv.elements[0].data;
                if (d2i_PrivateKey(NID_id_GostR3410_2001, &pkey, &p,
                                   (long) priv.elements[0].length) == NULL)
                        DST_RET(dst__openssl_toresult2(
                                            "d2i_PrivateKey",
                                            DST_R_INVALIDPRIVATEKEY));
        } else {
                if ((pub != NULL) && (pub->keydata.pkey != NULL)) {
                        eckey = EVP_PKEY_get0(pub->keydata.pkey);
                        pubkey = EC_KEY_get0_public_key(eckey);
                }

                privkey = BN_bin2bn(priv.elements[0].data,
                                    priv.elements[0].length, NULL);
                if (privkey == NULL)
                        DST_RET(ISC_R_NOMEMORY);

                /* can't create directly the whole key */
                p = gost_dummy_key;
                if (d2i_PrivateKey(NID_id_GostR3410_2001, &pkey, &p,
                                   (long) sizeof(gost_dummy_key)) == NULL)
                        DST_RET(dst__openssl_toresult2(
                                            "d2i_PrivateKey",
                                            DST_R_INVALIDPRIVATEKEY));

                eckey = EVP_PKEY_get0(pkey);
                if (eckey == NULL)
                        return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
                if (!EC_KEY_set_private_key(eckey, privkey))
                        DST_RET(ISC_R_NOMEMORY);

                /* have to (re)set the public key */
#ifdef notyet
                (void) gost2001_compute_public(eckey);
#else
                if ((pubkey != NULL) && !EC_KEY_set_public_key(eckey, pubkey))
                        DST_RET(ISC_R_NOMEMORY);
#endif
                BN_clear_free(privkey);
                privkey = NULL;
        }
        key->keydata.pkey = pkey;
        key->key_size = EVP_PKEY_bits(pkey);
        dst__privstruct_free(&priv, mctx);
        memset(&priv, 0, sizeof(priv));
        return (ISC_R_SUCCESS);

 err:
        if (privkey != NULL)
                BN_clear_free(privkey);
        if (pkey != NULL)
                EVP_PKEY_free(pkey);
        opensslgost_destroy(key);
        dst__privstruct_free(&priv, mctx);
        memset(&priv, 0, sizeof(priv));
        return (ret);
}

static void
opensslgost_cleanup(void) {
        if (e != NULL) {
                ENGINE_finish(e);
                ENGINE_free(e);
                e = NULL;
        }
}

static dst_func_t opensslgost_functions = {
        opensslgost_createctx,
        NULL, /*%< createctx2 */
        opensslgost_destroyctx,
        opensslgost_adddata,
        opensslgost_sign,
        opensslgost_verify,
        NULL, /*%< verify2 */
        NULL, /*%< computesecret */
        opensslgost_compare,
        NULL, /*%< paramcompare */
        opensslgost_generate,
        opensslgost_isprivate,
        opensslgost_destroy,
        opensslgost_todns,
        opensslgost_fromdns,
        opensslgost_tofile,
        opensslgost_parse,
        opensslgost_cleanup,
        NULL, /*%< fromlabel */
        NULL, /*%< dump */
        NULL  /*%< restore */
};

isc_result_t
dst__opensslgost_init(dst_func_t **funcp) {
        isc_result_t ret;

        REQUIRE(funcp != NULL);

        /* check if the gost engine works properly */
        e = ENGINE_by_id("gost");
        if (e == NULL)
                return (dst__openssl_toresult2("ENGINE_by_id",
                                               DST_R_OPENSSLFAILURE));
        if (ENGINE_init(e) <= 0) {
                ENGINE_free(e);
                e = NULL;
                return (dst__openssl_toresult2("ENGINE_init",
                                               DST_R_OPENSSLFAILURE));
        }
        /* better than to rely on digest_gost symbol */
        opensslgost_digest = ENGINE_get_digest(e, NID_id_GostR3411_94);
        if (opensslgost_digest == NULL)
                DST_RET(dst__openssl_toresult2("ENGINE_get_digest",
                                               DST_R_OPENSSLFAILURE));
        /* from openssl.cnf */
        if (ENGINE_register_pkey_asn1_meths(e) <= 0)
                DST_RET(dst__openssl_toresult2(
                                "ENGINE_register_pkey_asn1_meths",
                                DST_R_OPENSSLFAILURE));
        if (ENGINE_ctrl_cmd_string(e,
                                   "CRYPT_PARAMS",
                                   "id-Gost28147-89-CryptoPro-A-ParamSet",
                                   0) <= 0)
                DST_RET(dst__openssl_toresult2("ENGINE_ctrl_cmd_string",
                                               DST_R_OPENSSLFAILURE));

        if (*funcp == NULL)
                *funcp = &opensslgost_functions;
        return (ISC_R_SUCCESS);

 err:
        ENGINE_finish(e);
        ENGINE_free(e);
        e = NULL;
        return (ret);
}

#else /* HAVE_OPENSSL_GOST */

#include <isc/util.h>

EMPTY_TRANSLATION_UNIT

#endif /* HAVE_OPENSSL_GOST */
/*! \file */

---