1 files changed, 630 insertions, 0 deletions

diff --git a/lib/dns/opensslgost_link.c b/lib/dns/opensslgost_link.c
new file mode 100644
index 0000000..481b91c
--- /dev/null
+++ b/lib/dns/opensslgost_link.c
@@ -0,0 +1,630 @@
+/*
+ * 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.
+ */
+
+#include <config.h>
+
+#if defined(OPENSSL) && defined(HAVE_OPENSSL_GOST)
+
+#include <stdbool.h>
+
+#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>
+
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
+#define EVP_MD_CTX_new() &(ctx->_ctx), EVP_MD_CTX_init(&(ctx->_ctx))
+#define EVP_MD_CTX_free(ptr) EVP_MD_CTX_cleanup(ptr)
+#endif
+
+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);
+	ctx->ctx = EVP_MD_CTX_new();
+	if (ctx->ctx == NULL)
+		return (ISC_R_NOMEMORY);
+	ret = EVP_DigestInit(ctx->ctx, md);
+	if (ret != 1)
+		return (DST_R_CRYPTOFAILURE);
+	return (ISC_R_SUCCESS);
+}
+
+void
+isc_gost_invalidate(isc_gost_t *ctx) {
+	EVP_MD_CTX_free(ctx->ctx);
+	ctx->ctx = NULL;
+}
+
+isc_result_t
+isc_gost_update(isc_gost_t *ctx, const unsigned char *data,
+		unsigned int len)
+{
+	int ret;
+
+	INSIST(ctx != NULL);
+	INSIST(ctx->ctx != NULL);
+	INSIST(data != NULL);
+
+	ret = EVP_DigestUpdate(ctx->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(ctx->ctx != NULL);
+	INSIST(digest != NULL);
+
+	ret = EVP_DigestFinal(ctx->ctx, digest, NULL);
+	EVP_MD_CTX_free(ctx->ctx);
+	ctx->ctx = 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 bool
+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 (true);
+	else if (pkey1 == NULL || pkey2 == NULL)
+		return (false);
+
+	if (EVP_PKEY_cmp(pkey1, pkey2) != 1)
+		return (false);
+	return (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 bool
+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 (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;
+}
+
+static const 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);
+		isc_safe_memwipe(&priv, 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);
+	isc_safe_memwipe(&priv, 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);
+	isc_safe_memwipe(&priv, 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 */