lib/dns/opensslgost_link.c

	opensslgost_link.c revision 0c27b3fe77ac1d5094ba3521e8142d9e7973133f
/*
 * Copyright (C) 2010-2016  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/.
 */

#include <config.h>

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

#include <isc/entropy.h>
#include <isc/mem.h>
#include <isc/safe.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(isc_safe_memequal(gost_prefix, der, 37));
    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 */