From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 020EBC07E9A for ; Wed, 14 Jul 2021 14:21:19 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9A3E761154 for ; Wed, 14 Jul 2021 14:21:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9A3E761154 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:60448 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m3flF-0000rn-R1 for qemu-devel@archiver.kernel.org; Wed, 14 Jul 2021 10:21:17 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38218) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m3fbh-0005O6-VA for qemu-devel@nongnu.org; Wed, 14 Jul 2021 10:11:25 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:31527) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m3fbf-0007t2-HD for qemu-devel@nongnu.org; Wed, 14 Jul 2021 10:11:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1626271882; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=HuqRPOdiPzzVxp2zTLu951xPsYkhJLAuLHMA6xoe4XE=; b=CP1p+AAiOt+tOnWo9iioIyRD3Bb6jAYoOPwxQNdp6hvVG4XGV91LrqpRFPgO28K2rR1p2o dw8Gf75/zqZOjQ9MVBtseaq7udGgE69918xpRCf1d9QCbYpkjZfuy8V3rkHiGZ1qmUDtA3 F9eHXh+8mVttHh/X6d0xPgXWCUVEZyU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-591-o9vbbwDsOiO161KfZ9ijHg-1; Wed, 14 Jul 2021 10:11:21 -0400 X-MC-Unique: o9vbbwDsOiO161KfZ9ijHg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 257DD100C666; Wed, 14 Jul 2021 14:11:20 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-114-160.ams2.redhat.com [10.36.114.160]) by smtp.corp.redhat.com (Postfix) with ESMTP id 158536E0B6; Wed, 14 Jul 2021 14:11:16 +0000 (UTC) From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Subject: [PULL 14/26] crypto: add gnutls cipher provider Date: Wed, 14 Jul 2021 15:08:46 +0100 Message-Id: <20210714140858.2247409-15-berrange@redhat.com> In-Reply-To: <20210714140858.2247409-1-berrange@redhat.com> References: <20210714140858.2247409-1-berrange@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=berrange@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=216.205.24.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.699, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eduardo Otubo , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Eduardo Habkost , Juan Quintela , Jason Wang , Richard Henderson , "Dr. David Alan Gilbert" , Markus Armbruster , Jiri Pirko , Gerd Hoffmann , Paolo Bonzini , Eric Blake Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Add an implementation of the QEMU cipher APIs to the gnutls crypto backend. XTS support is only available for gnutls version >= 3.6.8. Since ECB mode is not exposed by gnutls APIs, we can't use the private XTS code for compatibility. Reviewed-by: Eric Blake Signed-off-by: Daniel P. Berrangé --- crypto/cipher-gnutls.c.inc | 335 +++++++++++++++++++++++++++++++++++++ crypto/cipher.c | 2 + 2 files changed, 337 insertions(+) create mode 100644 crypto/cipher-gnutls.c.inc diff --git a/crypto/cipher-gnutls.c.inc b/crypto/cipher-gnutls.c.inc new file mode 100644 index 0000000000..501e4e07a5 --- /dev/null +++ b/crypto/cipher-gnutls.c.inc @@ -0,0 +1,335 @@ +/* + * QEMU Crypto cipher gnutls algorithms + * + * Copyright (c) 2021 Red Hat, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see . + * + */ + +#include "qemu/osdep.h" +#include "cipherpriv.h" + +#include + +#if GNUTLS_VERSION_NUMBER >= 0x030608 +#define QEMU_GNUTLS_XTS +#endif + +bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg, + QCryptoCipherMode mode) +{ + + switch (mode) { + case QCRYPTO_CIPHER_MODE_ECB: + case QCRYPTO_CIPHER_MODE_CBC: + switch (alg) { + case QCRYPTO_CIPHER_ALG_AES_128: + case QCRYPTO_CIPHER_ALG_AES_192: + case QCRYPTO_CIPHER_ALG_AES_256: + case QCRYPTO_CIPHER_ALG_DES: + case QCRYPTO_CIPHER_ALG_3DES: + return true; + default: + return false; + } +#ifdef QEMU_GNUTLS_XTS + case QCRYPTO_CIPHER_MODE_XTS: + switch (alg) { + case QCRYPTO_CIPHER_ALG_AES_128: + case QCRYPTO_CIPHER_ALG_AES_256: + return true; + default: + return false; + } +#endif + default: + return false; + } +} + +typedef struct QCryptoCipherGnutls QCryptoCipherGnutls; +struct QCryptoCipherGnutls { + QCryptoCipher base; + gnutls_cipher_hd_t handle; /* XTS & CBC mode */ + gnutls_cipher_algorithm_t galg; /* ECB mode */ + guint8 *key; /* ECB mode */ + size_t nkey; /* ECB mode */ + size_t blocksize; +}; + + +static void +qcrypto_gnutls_cipher_free(QCryptoCipher *cipher) +{ + QCryptoCipherGnutls *ctx = container_of(cipher, QCryptoCipherGnutls, base); + + g_free(ctx->key); + if (ctx->handle) { + gnutls_cipher_deinit(ctx->handle); + } + g_free(ctx); +} + + +static int +qcrypto_gnutls_cipher_encrypt(QCryptoCipher *cipher, + const void *in, + void *out, + size_t len, + Error **errp) +{ + QCryptoCipherGnutls *ctx = container_of(cipher, QCryptoCipherGnutls, base); + int err; + + if (len % ctx->blocksize) { + error_setg(errp, "Length %zu must be a multiple of block size %zu", + len, ctx->blocksize); + return -1; + } + + if (ctx->handle) { /* CBC / XTS mode */ + err = gnutls_cipher_encrypt2(ctx->handle, + in, len, + out, len); + if (err != 0) { + error_setg(errp, "Cannot encrypt data: %s", + gnutls_strerror(err)); + return -1; + } + } else { /* ECB mode very inefficiently faked with CBC */ + g_autofree unsigned char *iv = g_new0(unsigned char, ctx->blocksize); + while (len) { + gnutls_cipher_hd_t handle; + gnutls_datum_t gkey = { (unsigned char *)ctx->key, ctx->nkey }; + int err = gnutls_cipher_init(&handle, ctx->galg, &gkey, NULL); + if (err != 0) { + error_setg(errp, "Cannot initialize cipher: %s", + gnutls_strerror(err)); + return -1; + } + + gnutls_cipher_set_iv(handle, iv, ctx->blocksize); + + err = gnutls_cipher_encrypt2(handle, + in, ctx->blocksize, + out, ctx->blocksize); + if (err != 0) { + gnutls_cipher_deinit(handle); + error_setg(errp, "Cannot encrypt data: %s", + gnutls_strerror(err)); + return -1; + } + gnutls_cipher_deinit(handle); + + len -= ctx->blocksize; + in += ctx->blocksize; + out += ctx->blocksize; + } + } + + return 0; +} + + +static int +qcrypto_gnutls_cipher_decrypt(QCryptoCipher *cipher, + const void *in, + void *out, + size_t len, + Error **errp) +{ + QCryptoCipherGnutls *ctx = container_of(cipher, QCryptoCipherGnutls, base); + int err; + + if (len % ctx->blocksize) { + error_setg(errp, "Length %zu must be a multiple of block size %zu", + len, ctx->blocksize); + return -1; + } + + if (ctx->handle) { /* CBC / XTS mode */ + err = gnutls_cipher_decrypt2(ctx->handle, + in, len, + out, len); + + if (err != 0) { + error_setg(errp, "Cannot decrypt data: %s", + gnutls_strerror(err)); + return -1; + } + } else { /* ECB mode very inefficiently faked with CBC */ + g_autofree unsigned char *iv = g_new0(unsigned char, ctx->blocksize); + while (len) { + gnutls_cipher_hd_t handle; + gnutls_datum_t gkey = { (unsigned char *)ctx->key, ctx->nkey }; + int err = gnutls_cipher_init(&handle, ctx->galg, &gkey, NULL); + if (err != 0) { + error_setg(errp, "Cannot initialize cipher: %s", + gnutls_strerror(err)); + return -1; + } + + gnutls_cipher_set_iv(handle, iv, ctx->blocksize); + + err = gnutls_cipher_decrypt2(handle, + in, ctx->blocksize, + out, ctx->blocksize); + if (err != 0) { + gnutls_cipher_deinit(handle); + error_setg(errp, "Cannot encrypt data: %s", + gnutls_strerror(err)); + return -1; + } + gnutls_cipher_deinit(handle); + + len -= ctx->blocksize; + in += ctx->blocksize; + out += ctx->blocksize; + } + } + + return 0; +} + +static int +qcrypto_gnutls_cipher_setiv(QCryptoCipher *cipher, + const uint8_t *iv, size_t niv, + Error **errp) +{ + QCryptoCipherGnutls *ctx = container_of(cipher, QCryptoCipherGnutls, base); + + if (niv != ctx->blocksize) { + error_setg(errp, "Expected IV size %zu not %zu", + ctx->blocksize, niv); + return -1; + } + + gnutls_cipher_set_iv(ctx->handle, (unsigned char *)iv, niv); + + return 0; +} + + +static struct QCryptoCipherDriver gnutls_driver = { + .cipher_encrypt = qcrypto_gnutls_cipher_encrypt, + .cipher_decrypt = qcrypto_gnutls_cipher_decrypt, + .cipher_setiv = qcrypto_gnutls_cipher_setiv, + .cipher_free = qcrypto_gnutls_cipher_free, +}; + +static QCryptoCipher *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg, + QCryptoCipherMode mode, + const uint8_t *key, + size_t nkey, + Error **errp) +{ + QCryptoCipherGnutls *ctx; + gnutls_datum_t gkey = { (unsigned char *)key, nkey }; + gnutls_cipher_algorithm_t galg = GNUTLS_CIPHER_UNKNOWN; + int err; + + switch (mode) { +#ifdef QEMU_GNUTLS_XTS + case QCRYPTO_CIPHER_MODE_XTS: + switch (alg) { + case QCRYPTO_CIPHER_ALG_AES_128: + galg = GNUTLS_CIPHER_AES_128_XTS; + break; + case QCRYPTO_CIPHER_ALG_AES_256: + galg = GNUTLS_CIPHER_AES_256_XTS; + break; + default: + break; + } + break; +#endif + + case QCRYPTO_CIPHER_MODE_ECB: + case QCRYPTO_CIPHER_MODE_CBC: + switch (alg) { + case QCRYPTO_CIPHER_ALG_AES_128: + galg = GNUTLS_CIPHER_AES_128_CBC; + break; + case QCRYPTO_CIPHER_ALG_AES_192: + galg = GNUTLS_CIPHER_AES_192_CBC; + break; + case QCRYPTO_CIPHER_ALG_AES_256: + galg = GNUTLS_CIPHER_AES_256_CBC; + break; + case QCRYPTO_CIPHER_ALG_DES: + galg = GNUTLS_CIPHER_DES_CBC; + break; + case QCRYPTO_CIPHER_ALG_3DES: + galg = GNUTLS_CIPHER_3DES_CBC; + break; + default: + break; + } + break; + default: + break; + } + + if (galg == GNUTLS_CIPHER_UNKNOWN) { + error_setg(errp, "Unsupported cipher algorithm %s with %s mode", + QCryptoCipherAlgorithm_str(alg), + QCryptoCipherMode_str(mode)); + return NULL; + } + + if (!qcrypto_cipher_validate_key_length(alg, mode, nkey, errp)) { + return NULL; + } + + ctx = g_new0(QCryptoCipherGnutls, 1); + ctx->base.driver = &gnutls_driver; + + if (mode == QCRYPTO_CIPHER_MODE_ECB) { + ctx->key = g_new0(guint8, nkey); + memcpy(ctx->key, key, nkey); + ctx->nkey = nkey; + ctx->galg = galg; + } else { + err = gnutls_cipher_init(&ctx->handle, galg, &gkey, NULL); + if (err != 0) { + error_setg(errp, "Cannot initialize cipher: %s", + gnutls_strerror(err)); + goto error; + } + } + + if (alg == QCRYPTO_CIPHER_ALG_DES || + alg == QCRYPTO_CIPHER_ALG_3DES) + ctx->blocksize = 8; + else + ctx->blocksize = 16; + + /* + * Our API contract for requires iv to be optional + * but nettle gets unhappy when called by gnutls + * in this case, so we just force set a default + * all-zeros IV, to match behaviour of other backends. + */ + if (mode != QCRYPTO_CIPHER_MODE_ECB) { + g_autofree unsigned char *iv = g_new0(unsigned char, ctx->blocksize); + gnutls_cipher_set_iv(ctx->handle, iv, ctx->blocksize); + } + + return &ctx->base; + + error: + qcrypto_gnutls_cipher_free(&ctx->base); + return NULL; +} diff --git a/crypto/cipher.c b/crypto/cipher.c index 1f5528be49..74b09a5b26 100644 --- a/crypto/cipher.c +++ b/crypto/cipher.c @@ -136,6 +136,8 @@ qcrypto_cipher_validate_key_length(QCryptoCipherAlgorithm alg, #include "cipher-gcrypt.c.inc" #elif defined CONFIG_NETTLE #include "cipher-nettle.c.inc" +#elif defined CONFIG_GNUTLS_CRYPTO +#include "cipher-gnutls.c.inc" #else #include "cipher-builtin.c.inc" #endif -- 2.31.1