From patchwork Tue Jun 18 21:27:46 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ard Biesheuvel X-Patchwork-Id: 11002897 X-Patchwork-Delegate: snitzer@redhat.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 815C576 for ; Tue, 18 Jun 2019 21:28:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6F95728B50 for ; Tue, 18 Jun 2019 21:28:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 638E728B5A; Tue, 18 Jun 2019 21:28:56 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 34B8628B53 for ; Tue, 18 Jun 2019 21:28:54 +0000 (UTC) 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 mx1.redhat.com (Postfix) with ESMTPS id 02C73C056899; Tue, 18 Jun 2019 21:28:46 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.21]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 9A6BD6013D; Tue, 18 Jun 2019 21:28:37 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id C71074EBC3; Tue, 18 Jun 2019 21:28:26 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id x5ILSJH5018845 for ; Tue, 18 Jun 2019 17:28:19 -0400 Received: by smtp.corp.redhat.com (Postfix) id 57EA07DFD9; Tue, 18 Jun 2019 21:28:19 +0000 (UTC) Delivered-To: dm-devel@redhat.com Received: from mx1.redhat.com (ext-mx03.extmail.prod.ext.phx2.redhat.com [10.5.110.27]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 514E37DFD4 for ; Tue, 18 Jun 2019 21:28:16 +0000 (UTC) Received: from mail-wr1-f67.google.com (mail-wr1-f67.google.com [209.85.221.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5F6C581F2F for ; Tue, 18 Jun 2019 21:28:07 +0000 (UTC) Received: by mail-wr1-f67.google.com with SMTP id x4so1042195wrt.6 for ; Tue, 18 Jun 2019 14:28:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=EVl3ZqppaSRl5kC3hjPAS0th63oGGSKX7nxl/AgvVDc=; b=L5b+RE9lbPL+Kr3H9nEqa1Kk3WVL5L08ZnZGfqXRaKO51RHlDkaZv+qp1UeCncxNhV TgefC8LiUZQNYftxckWfFfzt2HA+5omfzK+4lCzQM5ZdiYbDNHIWO2zkGub3U4TiAQZj nfx1GCJa2ovWVwN3cvlk4wevblLBDD7SVX/kwZG3LqYZjrkIYSzr+Js0ZYcQncw03Uaa M+Mc7s5dysMlpr0BzgsW5YCuOu22XnBlGHxtE5s0LKqgSynxwlBa9xrf8EDvOouEht83 2dVGaTN3BbzWbpXuYztaIQ7QzFJKZqSIgrvmxngR2bw1rkHqHWDbOuuKQtAnkKrMMuRf X53Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=EVl3ZqppaSRl5kC3hjPAS0th63oGGSKX7nxl/AgvVDc=; b=nyGB7AUnQ7wkk6NqgBVX/EcvPDXuyl0NCi1FNNPcCiwZ8ew4JxhnrmzE9JLCY/W//k n0/05iRTRCZglmzSVy/XGj6w1fzo2oDvsNAxYwiH2uW1GFV0c+XeP2tBrr+Bs+4yl+xe AtxLY8f6xn33QaPuLJEcGjY3ypHd04Eo8nwW8no5Y2W+fPxyXGazA9cGtgTU/97/1mV7 DVMzr7QTg+U2HB80TASCs+r2fXqS5/OjGgMxe87529tdmTVq2/67bKQEm1VeXfFafoW9 Z17CG+dxV3XQOGBBODPN++PTfqZ0oxwOumJ2y87OJEZcstX91D7OqiEKJrR6894lMJZP bRlg== X-Gm-Message-State: APjAAAW/Jh+eFsyafTctd3/DqvqHn7EsrnR5euUWSC8Ym/Xbn1UzQ+1b TVjifTYqWfPzxKfBeJd1LNveDQ== X-Google-Smtp-Source: APXvYqyYqynE5COJdavDF0f9veqB7EJVlhoOJrH5z5QNW6pTYB2bim30cLtB8uoaKlJwRMUvTXMR7g== X-Received: by 2002:a5d:4752:: with SMTP id o18mr13775245wrs.74.1560893285721; Tue, 18 Jun 2019 14:28:05 -0700 (PDT) Received: from e111045-lin.arm.com (lfbn-nic-1-216-10.w2-15.abo.wanadoo.fr. [2.15.62.10]) by smtp.gmail.com with ESMTPSA id h21sm2273831wmb.47.2019.06.18.14.28.04 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Tue, 18 Jun 2019 14:28:05 -0700 (PDT) From: Ard Biesheuvel To: linux-crypto@vger.kernel.org Date: Tue, 18 Jun 2019 23:27:46 +0200 Message-Id: <20190618212749.8995-2-ard.biesheuvel@linaro.org> In-Reply-To: <20190618212749.8995-1-ard.biesheuvel@linaro.org> References: <20190618212749.8995-1-ard.biesheuvel@linaro.org> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Tue, 18 Jun 2019 21:28:07 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Tue, 18 Jun 2019 21:28:07 +0000 (UTC) for IP:'209.85.221.67' DOMAIN:'mail-wr1-f67.google.com' HELO:'mail-wr1-f67.google.com' FROM:'ard.biesheuvel@linaro.org' RCPT:'' X-RedHat-Spam-Score: -0.109 (DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NONE) 209.85.221.67 mail-wr1-f67.google.com 209.85.221.67 mail-wr1-f67.google.com X-Scanned-By: MIMEDefang 2.78 on 10.5.110.27 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-loop: dm-devel@redhat.com Cc: Herbert Xu , Eric Biggers , Ard Biesheuvel , linux-fscrypt@vger.kernel.org, Gilad Ben-Yossef , dm-devel@redhat.com, Milan Broz Subject: [dm-devel] [PATCH v2 1/4] crypto: essiv - create wrapper template for ESSIV generation X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Tue, 18 Jun 2019 21:28:54 +0000 (UTC) X-Virus-Scanned: ClamAV using ClamSMTP Implement a template that wraps a (skcipher,cipher,shash) or (aead,cipher,shash) tuple so that we can consolidate the ESSIV handling in fscrypt and dm-crypt and move it into the crypto API. This will result in better test coverage, and will allow future changes to make the bare cipher interface internal to the crypto subsystem, in order to increase robustness of the API against misuse. Note that especially the AEAD handling is a bit complex, and is tightly coupled to the way dm-crypt combines AEAD based on the authenc() template with the ESSIV handling. Signed-off-by: Ard Biesheuvel --- crypto/Kconfig | 4 + crypto/Makefile | 1 + crypto/essiv.c | 624 ++++++++++++++++++++ 3 files changed, 629 insertions(+) diff --git a/crypto/Kconfig b/crypto/Kconfig index 3d056e7da65f..1aa47087c1a2 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -1917,6 +1917,10 @@ config CRYPTO_STATS config CRYPTO_HASH_INFO bool +config CRYPTO_ESSIV + tristate + select CRYPTO_AUTHENC + source "drivers/crypto/Kconfig" source "crypto/asymmetric_keys/Kconfig" source "certs/Kconfig" diff --git a/crypto/Makefile b/crypto/Makefile index 266a4cdbb9e2..ad1d99ba6d56 100644 --- a/crypto/Makefile +++ b/crypto/Makefile @@ -148,6 +148,7 @@ obj-$(CONFIG_CRYPTO_USER_API_AEAD) += algif_aead.o obj-$(CONFIG_CRYPTO_ZSTD) += zstd.o obj-$(CONFIG_CRYPTO_OFB) += ofb.o obj-$(CONFIG_CRYPTO_ECC) += ecc.o +obj-$(CONFIG_CRYPTO_ESSIV) += essiv.o ecdh_generic-y += ecdh.o ecdh_generic-y += ecdh_helper.o diff --git a/crypto/essiv.c b/crypto/essiv.c new file mode 100644 index 000000000000..029a65afb4d7 --- /dev/null +++ b/crypto/essiv.c @@ -0,0 +1,624 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ESSIV skcipher template for block encryption + * + * Copyright (c) 2019 Linaro, Ltd. + * + * Heavily based on: + * adiantum length-preserving encryption mode + * + * Copyright 2018 Google LLC + */ + +#include +#include +#include +#include +#include +#include + +#include "internal.h" + +#define ESSIV_IV_SIZE sizeof(u64) // IV size of the outer algo +#define MAX_INNER_IV_SIZE 16 // max IV size of inner algo + +struct essiv_instance_ctx { + union { + struct crypto_skcipher_spawn blockcipher_spawn; + struct crypto_aead_spawn aead_spawn; + } u; + struct crypto_spawn essiv_cipher_spawn; + struct crypto_shash_spawn hash_spawn; +}; + +struct essiv_tfm_ctx { + union { + struct crypto_skcipher *blockcipher; + struct crypto_aead *aead; + } u; + struct crypto_cipher *essiv_cipher; + struct crypto_shash *hash; +}; + +struct essiv_skcipher_request_ctx { + u8 iv[MAX_INNER_IV_SIZE]; + struct skcipher_request blockcipher_req; +}; + +struct essiv_aead_request_ctx { + u8 iv[MAX_INNER_IV_SIZE]; + struct scatterlist src[4], dst[4]; + struct aead_request aead_req; +}; + +static int essiv_skcipher_setkey(struct crypto_skcipher *tfm, + const u8 *key, unsigned int keylen) +{ + u32 flags = crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_REQ_MASK; + struct essiv_tfm_ctx *tctx = crypto_skcipher_ctx(tfm); + SHASH_DESC_ON_STACK(desc, tctx->hash); + unsigned int saltsize; + u8 *salt; + int err; + + crypto_skcipher_clear_flags(tctx->u.blockcipher, CRYPTO_TFM_REQ_MASK); + crypto_skcipher_set_flags(tctx->u.blockcipher, flags); + err = crypto_skcipher_setkey(tctx->u.blockcipher, key, keylen); + crypto_skcipher_set_flags(tfm, + crypto_skcipher_get_flags(tctx->u.blockcipher) & + CRYPTO_TFM_RES_MASK); + if (err) + return err; + + saltsize = crypto_shash_digestsize(tctx->hash); + salt = kmalloc(saltsize, GFP_KERNEL); + if (!salt) + return -ENOMEM; + + desc->tfm = tctx->hash; + crypto_shash_digest(desc, key, keylen, salt); + + crypto_cipher_clear_flags(tctx->essiv_cipher, CRYPTO_TFM_REQ_MASK); + crypto_cipher_set_flags(tctx->essiv_cipher, flags & CRYPTO_TFM_REQ_MASK); + err = crypto_cipher_setkey(tctx->essiv_cipher, salt, saltsize); + flags = crypto_cipher_get_flags(tctx->essiv_cipher) & CRYPTO_TFM_RES_MASK; + crypto_skcipher_set_flags(tfm, flags); + + kzfree(salt); + return err; +} + +static int essiv_aead_setkey(struct crypto_aead *tfm, const u8 *key, + unsigned int keylen) +{ + struct essiv_tfm_ctx *tctx = crypto_aead_ctx(tfm); + SHASH_DESC_ON_STACK(desc, tctx->hash); + struct crypto_authenc_keys keys; + unsigned int saltsize; + u8 *salt; + int err; + + crypto_aead_clear_flags(tctx->u.aead, CRYPTO_TFM_REQ_MASK); + crypto_aead_set_flags(tctx->u.aead, crypto_aead_get_flags(tfm) & + CRYPTO_TFM_REQ_MASK); + err = crypto_aead_setkey(tctx->u.aead, key, keylen); + crypto_aead_set_flags(tfm, crypto_aead_get_flags(tctx->u.aead) & + CRYPTO_TFM_RES_MASK); + if (err) + return err; + + if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) { + crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); + return -EINVAL; + } + + saltsize = crypto_shash_digestsize(tctx->hash); + salt = kmalloc(saltsize, GFP_KERNEL); + if (!salt) + return -ENOMEM; + + desc->tfm = tctx->hash; + crypto_shash_init(desc); + crypto_shash_update(desc, keys.enckey, keys.enckeylen); + crypto_shash_finup(desc, keys.authkey, keys.authkeylen, salt); + + crypto_cipher_clear_flags(tctx->essiv_cipher, CRYPTO_TFM_REQ_MASK); + crypto_cipher_set_flags(tctx->essiv_cipher, crypto_aead_get_flags(tfm) & + CRYPTO_TFM_REQ_MASK); + err = crypto_cipher_setkey(tctx->essiv_cipher, salt, saltsize); + crypto_aead_set_flags(tfm, crypto_cipher_get_flags(tctx->essiv_cipher) & + CRYPTO_TFM_RES_MASK); + + kzfree(salt); + return err; +} + +static int essiv_aead_setauthsize(struct crypto_aead *tfm, + unsigned int authsize) +{ + struct essiv_tfm_ctx *tctx = crypto_aead_ctx(tfm); + + return crypto_aead_setauthsize(tctx->u.aead, authsize); +} + +static void essiv_skcipher_done(struct crypto_async_request *areq, int err) +{ + struct skcipher_request *req = areq->data; + + skcipher_request_complete(req, err); +} + +static void essiv_aead_done(struct crypto_async_request *areq, int err) +{ + struct aead_request *req = areq->data; + + aead_request_complete(req, err); +} + +static void essiv_skcipher_prepare_subreq(struct skcipher_request *req) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + const struct essiv_tfm_ctx *tctx = crypto_skcipher_ctx(tfm); + struct essiv_skcipher_request_ctx *rctx = skcipher_request_ctx(req); + struct skcipher_request *subreq = &rctx->blockcipher_req; + + memset(rctx->iv, 0, crypto_cipher_blocksize(tctx->essiv_cipher)); + memcpy(rctx->iv, req->iv, crypto_skcipher_ivsize(tfm)); + + crypto_cipher_encrypt_one(tctx->essiv_cipher, rctx->iv, rctx->iv); + + skcipher_request_set_tfm(subreq, tctx->u.blockcipher); + skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, + rctx->iv); + skcipher_request_set_callback(subreq, req->base.flags, + essiv_skcipher_done, req); +} + +static int essiv_aead_prepare_subreq(struct aead_request *req) +{ + struct crypto_aead *tfm = crypto_aead_reqtfm(req); + const struct essiv_tfm_ctx *tctx = crypto_aead_ctx(tfm); + struct essiv_aead_request_ctx *rctx = aead_request_ctx(req); + int ivsize = crypto_cipher_blocksize(tctx->essiv_cipher); + int ssize = req->assoclen - crypto_aead_ivsize(tfm); + struct aead_request *subreq = &rctx->aead_req; + struct scatterlist *sg; + + /* + * dm-crypt embeds the sector number and the IV in the AAD region so we + * have to splice the converted IV into the subrequest that we pass on + * to the AEAD transform. This means we are tightly coupled to dm-crypt, + * but that should be the only user of this code in AEAD mode. + */ + if (ssize < 0 || sg_nents_for_len(req->src, ssize) != 1) + return -EINVAL; + + memset(rctx->iv, 0, ivsize); + memcpy(rctx->iv, req->iv, crypto_aead_ivsize(tfm)); + + crypto_cipher_encrypt_one(tctx->essiv_cipher, rctx->iv, rctx->iv); + + sg_init_table(rctx->src, 4); + sg_set_page(rctx->src, sg_page(req->src), ssize, req->src->offset); + sg_set_buf(rctx->src + 1, rctx->iv, ivsize); + sg = scatterwalk_ffwd(rctx->src + 2, req->src, req->assoclen); + if (sg != rctx->src + 2) + sg_chain(rctx->src, 3, sg); + + sg_init_table(rctx->dst, 4); + sg_set_page(rctx->dst, sg_page(req->dst), ssize, req->dst->offset); + sg_set_buf(rctx->dst + 1, rctx->iv, ivsize); + sg = scatterwalk_ffwd(rctx->dst + 2, req->dst, req->assoclen); + if (sg != rctx->dst + 2) + sg_chain(rctx->dst, 3, sg); + + aead_request_set_tfm(subreq, tctx->u.aead); + aead_request_set_crypt(subreq, rctx->src, rctx->dst, req->cryptlen, + rctx->iv); + aead_request_set_ad(subreq, ssize + ivsize); + aead_request_set_callback(subreq, req->base.flags, essiv_aead_done, req); + + return 0; +} + +static int essiv_skcipher_encrypt(struct skcipher_request *req) +{ + struct essiv_skcipher_request_ctx *rctx = skcipher_request_ctx(req); + + essiv_skcipher_prepare_subreq(req); + return crypto_skcipher_encrypt(&rctx->blockcipher_req); +} + +static int essiv_aead_encrypt(struct aead_request *req) +{ + struct essiv_aead_request_ctx *rctx = aead_request_ctx(req); + int err; + + err = essiv_aead_prepare_subreq(req); + if (err) + return err; + return crypto_aead_encrypt(&rctx->aead_req); +} + +static int essiv_skcipher_decrypt(struct skcipher_request *req) +{ + struct essiv_skcipher_request_ctx *rctx = skcipher_request_ctx(req); + return crypto_skcipher_decrypt(&rctx->blockcipher_req); +} + +static int essiv_aead_decrypt(struct aead_request *req) +{ + struct essiv_aead_request_ctx *rctx = aead_request_ctx(req); + int err; + + err = essiv_aead_prepare_subreq(req); + if (err) + return err; + + essiv_aead_prepare_subreq(req); + return crypto_aead_decrypt(&rctx->aead_req); +} + +static int essiv_init_tfm(struct essiv_instance_ctx *ictx, + struct essiv_tfm_ctx *tctx) +{ + struct crypto_cipher *essiv_cipher; + struct crypto_shash *hash; + int err; + + essiv_cipher = crypto_spawn_cipher(&ictx->essiv_cipher_spawn); + if (IS_ERR(essiv_cipher)) + return PTR_ERR(essiv_cipher); + + hash = crypto_spawn_shash(&ictx->hash_spawn); + if (IS_ERR(hash)) { + err = PTR_ERR(hash); + goto err_free_essiv_cipher; + } + + tctx->essiv_cipher = essiv_cipher; + tctx->hash = hash; + + return 0; + +err_free_essiv_cipher: + crypto_free_cipher(essiv_cipher); + return err; +} + +static int essiv_skcipher_init_tfm(struct crypto_skcipher *tfm) +{ + struct skcipher_instance *inst = skcipher_alg_instance(tfm); + struct essiv_instance_ctx *ictx = skcipher_instance_ctx(inst); + struct essiv_tfm_ctx *tctx = crypto_skcipher_ctx(tfm); + struct crypto_skcipher *blockcipher; + unsigned int subreq_size; + int err; + + BUILD_BUG_ON(offsetofend(struct essiv_skcipher_request_ctx, + blockcipher_req) != + sizeof(struct essiv_skcipher_request_ctx)); + + blockcipher = crypto_spawn_skcipher(&ictx->u.blockcipher_spawn); + if (IS_ERR(blockcipher)) + return PTR_ERR(blockcipher); + + subreq_size = FIELD_SIZEOF(struct essiv_skcipher_request_ctx, + blockcipher_req) + + crypto_skcipher_reqsize(blockcipher); + + crypto_skcipher_set_reqsize(tfm, offsetof(struct essiv_skcipher_request_ctx, + blockcipher_req) + subreq_size); + + err = essiv_init_tfm(ictx, tctx); + if (err) + crypto_free_skcipher(blockcipher); + + tctx->u.blockcipher = blockcipher; + return err; +} + +static int essiv_aead_init_tfm(struct crypto_aead *tfm) +{ + struct aead_instance *inst = aead_alg_instance(tfm); + struct essiv_instance_ctx *ictx = aead_instance_ctx(inst); + struct essiv_tfm_ctx *tctx = crypto_aead_ctx(tfm); + struct crypto_aead *aead; + unsigned int subreq_size; + int err; + + BUILD_BUG_ON(offsetofend(struct essiv_aead_request_ctx, aead_req) != + sizeof(struct essiv_aead_request_ctx)); + + aead = crypto_spawn_aead(&ictx->u.aead_spawn); + if (IS_ERR(aead)) + return PTR_ERR(aead); + + subreq_size = FIELD_SIZEOF(struct essiv_aead_request_ctx, aead_req) + + crypto_aead_reqsize(aead); + + crypto_aead_set_reqsize(tfm, offsetof(struct essiv_aead_request_ctx, + aead_req) + subreq_size); + + err = essiv_init_tfm(ictx, tctx); + if (err) + crypto_free_aead(aead); + + tctx->u.aead = aead; + return err; +} + +static void essiv_skcipher_exit_tfm(struct crypto_skcipher *tfm) +{ + struct essiv_tfm_ctx *tctx = crypto_skcipher_ctx(tfm); + + crypto_free_skcipher(tctx->u.blockcipher); + crypto_free_cipher(tctx->essiv_cipher); + crypto_free_shash(tctx->hash); +} + +static void essiv_aead_exit_tfm(struct crypto_aead *tfm) +{ + struct essiv_tfm_ctx *tctx = crypto_aead_ctx(tfm); + + crypto_free_aead(tctx->u.aead); + crypto_free_cipher(tctx->essiv_cipher); + crypto_free_shash(tctx->hash); +} + +static void essiv_skcipher_free_instance(struct skcipher_instance *inst) +{ + struct essiv_instance_ctx *ictx = skcipher_instance_ctx(inst); + + crypto_drop_skcipher(&ictx->u.blockcipher_spawn); + crypto_drop_spawn(&ictx->essiv_cipher_spawn); + crypto_drop_shash(&ictx->hash_spawn); + kfree(inst); +} + +static void essiv_aead_free_instance(struct aead_instance *inst) +{ + struct essiv_instance_ctx *ictx = aead_instance_ctx(inst); + + crypto_drop_aead(&ictx->u.aead_spawn); + crypto_drop_spawn(&ictx->essiv_cipher_spawn); + crypto_drop_shash(&ictx->hash_spawn); + kfree(inst); +} + +static bool essiv_supported_algorithms(struct crypto_alg *essiv_cipher_alg, + struct shash_alg *hash_alg, + int ivsize) +{ + if (hash_alg->digestsize < essiv_cipher_alg->cra_cipher.cia_min_keysize || + hash_alg->digestsize > essiv_cipher_alg->cra_cipher.cia_max_keysize) + return false; + + if (ivsize != essiv_cipher_alg->cra_blocksize) + return false; + + if (ivsize > MAX_INNER_IV_SIZE) + return false; + + return true; +} + +static int essiv_create(struct crypto_template *tmpl, struct rtattr **tb) +{ + struct crypto_attr_type *algt; + const char *blockcipher_name; + const char *essiv_cipher_name; + const char *shash_name; + struct skcipher_instance *skcipher_inst = NULL; + struct aead_instance *aead_inst = NULL; + struct crypto_instance *inst; + struct crypto_alg *base, *block_base; + struct essiv_instance_ctx *ictx; + struct skcipher_alg *blockcipher_alg = NULL; + struct aead_alg *aead_alg = NULL; + struct crypto_alg *essiv_cipher_alg; + struct crypto_alg *_hash_alg; + struct shash_alg *hash_alg; + int ivsize; + u32 type; + int err; + + algt = crypto_get_attr_type(tb); + if (IS_ERR(algt)) + return PTR_ERR(algt); + + blockcipher_name = crypto_attr_alg_name(tb[1]); + if (IS_ERR(blockcipher_name)) + return PTR_ERR(blockcipher_name); + + essiv_cipher_name = crypto_attr_alg_name(tb[2]); + if (IS_ERR(essiv_cipher_name)) + return PTR_ERR(essiv_cipher_name); + + shash_name = crypto_attr_alg_name(tb[3]); + if (IS_ERR(shash_name)) + return PTR_ERR(shash_name); + + type = algt->type & algt->mask; + + switch (type) { + case CRYPTO_ALG_TYPE_BLKCIPHER: + skcipher_inst = kzalloc(sizeof(*skcipher_inst) + + sizeof(*ictx), GFP_KERNEL); + if (!skcipher_inst) + return -ENOMEM; + inst = skcipher_crypto_instance(skcipher_inst); + base = &skcipher_inst->alg.base; + ictx = crypto_instance_ctx(inst); + + /* Block cipher, e.g. "cbc(aes)" */ + crypto_set_skcipher_spawn(&ictx->u.blockcipher_spawn, inst); + err = crypto_grab_skcipher(&ictx->u.blockcipher_spawn, + blockcipher_name, 0, + crypto_requires_sync(algt->type, + algt->mask)); + if (err) + goto out_free_inst; + blockcipher_alg = crypto_spawn_skcipher_alg(&ictx->u.blockcipher_spawn); + block_base = &blockcipher_alg->base; + ivsize = blockcipher_alg->ivsize; + break; + + case CRYPTO_ALG_TYPE_AEAD: + aead_inst = kzalloc(sizeof(*aead_inst) + + sizeof(*ictx), GFP_KERNEL); + if (!aead_inst) + return -ENOMEM; + inst = aead_crypto_instance(aead_inst); + base = &aead_inst->alg.base; + ictx = crypto_instance_ctx(inst); + + /* AEAD cipher, e.g. "authenc(hmac(sha256),cbc(aes))" */ + crypto_set_aead_spawn(&ictx->u.aead_spawn, inst); + err = crypto_grab_aead(&ictx->u.aead_spawn, + blockcipher_name, 0, + crypto_requires_sync(algt->type, + algt->mask)); + if (err) + goto out_free_inst; + aead_alg = crypto_spawn_aead_alg(&ictx->u.aead_spawn); + block_base = &aead_alg->base; + ivsize = aead_alg->ivsize; + break; + + default: + return -EINVAL; + } + + /* Block cipher, e.g. "aes" */ + crypto_set_spawn(&ictx->essiv_cipher_spawn, inst); + err = crypto_grab_spawn(&ictx->essiv_cipher_spawn, essiv_cipher_name, + CRYPTO_ALG_TYPE_CIPHER, CRYPTO_ALG_TYPE_MASK); + if (err) + goto out_drop_blockcipher; + essiv_cipher_alg = ictx->essiv_cipher_spawn.alg; + + /* Synchronous hash, e.g., "sha256" */ + _hash_alg = crypto_alg_mod_lookup(shash_name, + CRYPTO_ALG_TYPE_SHASH, + CRYPTO_ALG_TYPE_MASK); + if (IS_ERR(_hash_alg)) { + err = PTR_ERR(_hash_alg); + goto out_drop_essiv_cipher; + } + hash_alg = __crypto_shash_alg(_hash_alg); + err = crypto_init_shash_spawn(&ictx->hash_spawn, hash_alg, inst); + if (err) + goto out_put_hash; + + /* Check the set of algorithms */ + if (!essiv_supported_algorithms(essiv_cipher_alg, hash_alg, ivsize)) { + pr_warn("Unsupported essiv instantiation: (%s,%s,%s)\n", + block_base->cra_name, + essiv_cipher_alg->cra_name, + hash_alg->base.cra_name); + err = -EINVAL; + goto out_drop_hash; + } + + /* Instance fields */ + + err = -ENAMETOOLONG; + if (snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, + "essiv(%s,%s,%s)", block_base->cra_name, + essiv_cipher_alg->cra_name, + hash_alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME) + goto out_drop_hash; + if (snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, + "essiv(%s,%s,%s)", + block_base->cra_driver_name, + essiv_cipher_alg->cra_driver_name, + hash_alg->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) + goto out_drop_hash; + + base->cra_flags = block_base->cra_flags & CRYPTO_ALG_ASYNC; + base->cra_blocksize = block_base->cra_blocksize; + base->cra_ctxsize = sizeof(struct essiv_tfm_ctx); + base->cra_alignmask = block_base->cra_alignmask; + base->cra_priority = block_base->cra_priority; + + if (type == CRYPTO_ALG_TYPE_BLKCIPHER) { + skcipher_inst->alg.setkey = essiv_skcipher_setkey; + skcipher_inst->alg.encrypt = essiv_skcipher_encrypt; + skcipher_inst->alg.decrypt = essiv_skcipher_decrypt; + skcipher_inst->alg.init = essiv_skcipher_init_tfm; + skcipher_inst->alg.exit = essiv_skcipher_exit_tfm; + + skcipher_inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(blockcipher_alg); + skcipher_inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(blockcipher_alg); + skcipher_inst->alg.ivsize = ESSIV_IV_SIZE; + skcipher_inst->alg.chunksize = blockcipher_alg->chunksize; + skcipher_inst->alg.walksize = blockcipher_alg->walksize; + + skcipher_inst->free = essiv_skcipher_free_instance; + + err = skcipher_register_instance(tmpl, skcipher_inst); + } else { + aead_inst->alg.setkey = essiv_aead_setkey; + aead_inst->alg.setauthsize = essiv_aead_setauthsize; + aead_inst->alg.encrypt = essiv_aead_encrypt; + aead_inst->alg.decrypt = essiv_aead_decrypt; + aead_inst->alg.init = essiv_aead_init_tfm; + aead_inst->alg.exit = essiv_aead_exit_tfm; + + aead_inst->alg.ivsize = ESSIV_IV_SIZE; + aead_inst->alg.maxauthsize = aead_alg->maxauthsize; + aead_inst->alg.chunksize = aead_alg->chunksize; + + aead_inst->free = essiv_aead_free_instance; + + err = aead_register_instance(tmpl, aead_inst); + } + + if (err) + goto out_drop_hash; + + crypto_mod_put(_hash_alg); + return 0; + +out_drop_hash: + crypto_drop_shash(&ictx->hash_spawn); +out_put_hash: + crypto_mod_put(_hash_alg); +out_drop_essiv_cipher: + crypto_drop_spawn(&ictx->essiv_cipher_spawn); +out_drop_blockcipher: + if (type == CRYPTO_ALG_TYPE_BLKCIPHER) { + crypto_drop_skcipher(&ictx->u.blockcipher_spawn); + } else { + crypto_drop_aead(&ictx->u.aead_spawn); + } +out_free_inst: + kfree(skcipher_inst); + kfree(aead_inst); + return err; +} + +/* essiv(blockcipher_name, essiv_cipher_name, shash_name) */ +static struct crypto_template essiv_tmpl = { + .name = "essiv", + .create = essiv_create, + .module = THIS_MODULE, +}; + +static int __init essiv_module_init(void) +{ + return crypto_register_template(&essiv_tmpl); +} + +static void __exit essiv_module_exit(void) +{ + crypto_unregister_template(&essiv_tmpl); +} + +subsys_initcall(essiv_module_init); +module_exit(essiv_module_exit); + +MODULE_DESCRIPTION("ESSIV skcipher/aead wrapper for block encryption"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS_CRYPTO("essiv"); From patchwork Tue Jun 18 21:27:47 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ard Biesheuvel X-Patchwork-Id: 11002899 X-Patchwork-Delegate: snitzer@redhat.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 02A4676 for ; Tue, 18 Jun 2019 21:29:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E67C128B57 for ; Tue, 18 Jun 2019 21:29:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DAE8D212E8; Tue, 18 Jun 2019 21:29:10 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 9F84F212E8 for ; Tue, 18 Jun 2019 21:29:08 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id BE0C5316290E; Tue, 18 Jun 2019 21:28:47 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.20]) by smtp.corp.redhat.com (Postfix) with ESMTPS id A80BA5ED54; Tue, 18 Jun 2019 21:28:35 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id 000ED1806B18; Tue, 18 Jun 2019 21:28:24 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id x5ILSLgS018851 for ; Tue, 18 Jun 2019 17:28:22 -0400 Received: by smtp.corp.redhat.com (Postfix) id 6F29A6108C; Tue, 18 Jun 2019 21:28:21 +0000 (UTC) Delivered-To: dm-devel@redhat.com Received: from mx1.redhat.com (ext-mx09.extmail.prod.ext.phx2.redhat.com [10.5.110.38]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 6969E9F63 for ; Tue, 18 Jun 2019 21:28:19 +0000 (UTC) Received: from mail-wr1-f67.google.com (mail-wr1-f67.google.com [209.85.221.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 49869CA1FF for ; Tue, 18 Jun 2019 21:28:09 +0000 (UTC) Received: by mail-wr1-f67.google.com with SMTP id d18so1058926wrs.5 for ; Tue, 18 Jun 2019 14:28:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=gHO2KLrUA3I7yUEmSueCdlizyCKC0yerXVKj0vKIABE=; b=zrP1xnhNTl+xUBtXaeqY/FAxiJJK2ODnx9N46cxpMqn2eyJPpDlOZxNDfg8iahaHKf zhmHSRvjYHXxxtsGvjdVfyCbnj3+bURPrpBQj+uHj1dIxMnnXaTxBWtMdiFI6Tl5qbVF 5H0YmYqIrqNHVQ8dNV7Cxs/22npNvYgGBB/579cqzMa0mZtZBz056H4fctBNDL8WnSmc H7WyVU1jd6JUD6gXP2JbF5r0yGByM02tK7rZEPXLDCF8joZjbgWVQ4C+UPHTZVTNDoY5 QGnF1t2a2cHpUmsIg1jLC/t8GakmZntke6yhGEmSwr4ywJBXXaMqWWYlEshrNRcNTJ6s h5PQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=gHO2KLrUA3I7yUEmSueCdlizyCKC0yerXVKj0vKIABE=; b=PlC1nJiHf5p9qkkygLLU9E+pVwZkFxlIDdXM2BS5VFVbTGlvxVzcFJvll7EO4lEJac Dt4b/ylEp84NEtTmP59A8Tg1EX2jg5atg/XcVs/cs6xZZ467EPbJdvIuhHfuk2EOuvcp KmuJpaK4245SNoMCpy32gA+3KPTWqwI06+6z9+bSmVtXo9IrYx6Wa87o7Qhat+fIrt0O BN+5RsXZ4T4TOmVff0FyvEsYS0ZaqbKtxaT09ZZ33zszlSf//zzxSah2nDsmt6v2zRjI iMwALQv2XkZ8n28L3rwKts2Q2jmKEEn5gXcOmD+BaTlSsS6UTkR/gyLZKHTUPU3IoVNL k5Ig== X-Gm-Message-State: APjAAAXTVgTH85px6Xo20VM/ZJzVsmTRQJcPVlCdE5xtZ/Ha7Hx4rz1F 5p/NlhPMKduvv77LumPq2ykSaQ== X-Google-Smtp-Source: APXvYqwnTFD/L70kthQxYD9k2Qdn2uFMJBObTSWDtJGKXxZwnrouykFwApdUgP+DCx2KgZvVQd+p9w== X-Received: by 2002:a5d:49c4:: with SMTP id t4mr26274734wrs.318.1560893287863; Tue, 18 Jun 2019 14:28:07 -0700 (PDT) Received: from e111045-lin.arm.com (lfbn-nic-1-216-10.w2-15.abo.wanadoo.fr. [2.15.62.10]) by smtp.gmail.com with ESMTPSA id h21sm2273831wmb.47.2019.06.18.14.28.05 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Tue, 18 Jun 2019 14:28:06 -0700 (PDT) From: Ard Biesheuvel To: linux-crypto@vger.kernel.org Date: Tue, 18 Jun 2019 23:27:47 +0200 Message-Id: <20190618212749.8995-3-ard.biesheuvel@linaro.org> In-Reply-To: <20190618212749.8995-1-ard.biesheuvel@linaro.org> References: <20190618212749.8995-1-ard.biesheuvel@linaro.org> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Tue, 18 Jun 2019 21:28:11 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Tue, 18 Jun 2019 21:28:11 +0000 (UTC) for IP:'209.85.221.67' DOMAIN:'mail-wr1-f67.google.com' HELO:'mail-wr1-f67.google.com' FROM:'ard.biesheuvel@linaro.org' RCPT:'' X-RedHat-Spam-Score: -0.111 (DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_PASS) 209.85.221.67 mail-wr1-f67.google.com 209.85.221.67 mail-wr1-f67.google.com X-Scanned-By: MIMEDefang 2.78 on 10.5.110.38 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-loop: dm-devel@redhat.com Cc: Herbert Xu , Eric Biggers , Ard Biesheuvel , linux-fscrypt@vger.kernel.org, Gilad Ben-Yossef , dm-devel@redhat.com, Milan Broz Subject: [dm-devel] [PATCH v2 2/4] fs: crypto: invoke crypto API for ESSIV handling X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.41]); Tue, 18 Jun 2019 21:29:07 +0000 (UTC) X-Virus-Scanned: ClamAV using ClamSMTP Instead of open coding the calculations for ESSIV handling, use a ESSIV skcipher which does all of this under the hood. Signed-off-by: Ard Biesheuvel --- fs/crypto/Kconfig | 1 + fs/crypto/crypto.c | 5 -- fs/crypto/fscrypt_private.h | 9 -- fs/crypto/keyinfo.c | 88 +------------------- 4 files changed, 3 insertions(+), 100 deletions(-) diff --git a/fs/crypto/Kconfig b/fs/crypto/Kconfig index 24ed99e2eca0..b0292da8613c 100644 --- a/fs/crypto/Kconfig +++ b/fs/crypto/Kconfig @@ -5,6 +5,7 @@ config FS_ENCRYPTION select CRYPTO_AES select CRYPTO_CBC select CRYPTO_ECB + select CRYPTO_ESSIV select CRYPTO_XTS select CRYPTO_CTS select CRYPTO_SHA256 diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c index 335a362ee446..c53ce262a06c 100644 --- a/fs/crypto/crypto.c +++ b/fs/crypto/crypto.c @@ -136,9 +136,6 @@ void fscrypt_generate_iv(union fscrypt_iv *iv, u64 lblk_num, if (ci->ci_flags & FS_POLICY_FLAG_DIRECT_KEY) memcpy(iv->nonce, ci->ci_nonce, FS_KEY_DERIVATION_NONCE_SIZE); - - if (ci->ci_essiv_tfm != NULL) - crypto_cipher_encrypt_one(ci->ci_essiv_tfm, iv->raw, iv->raw); } int fscrypt_do_page_crypto(const struct inode *inode, fscrypt_direction_t rw, @@ -492,8 +489,6 @@ static void __exit fscrypt_exit(void) destroy_workqueue(fscrypt_read_workqueue); kmem_cache_destroy(fscrypt_ctx_cachep); kmem_cache_destroy(fscrypt_info_cachep); - - fscrypt_essiv_cleanup(); } module_exit(fscrypt_exit); diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h index 7da276159593..59d0cba9cfb9 100644 --- a/fs/crypto/fscrypt_private.h +++ b/fs/crypto/fscrypt_private.h @@ -61,12 +61,6 @@ struct fscrypt_info { /* The actual crypto transform used for encryption and decryption */ struct crypto_skcipher *ci_ctfm; - /* - * Cipher for ESSIV IV generation. Only set for CBC contents - * encryption, otherwise is NULL. - */ - struct crypto_cipher *ci_essiv_tfm; - /* * Encryption mode used for this inode. It corresponds to either * ci_data_mode or ci_filename_mode, depending on the inode type. @@ -166,9 +160,6 @@ struct fscrypt_mode { int keysize; int ivsize; bool logged_impl_name; - bool needs_essiv; }; -extern void __exit fscrypt_essiv_cleanup(void); - #endif /* _FSCRYPT_PRIVATE_H */ diff --git a/fs/crypto/keyinfo.c b/fs/crypto/keyinfo.c index dcd91a3fbe49..82c7eb86ca00 100644 --- a/fs/crypto/keyinfo.c +++ b/fs/crypto/keyinfo.c @@ -19,8 +19,6 @@ #include #include "fscrypt_private.h" -static struct crypto_shash *essiv_hash_tfm; - /* Table of keys referenced by FS_POLICY_FLAG_DIRECT_KEY policies */ static DEFINE_HASHTABLE(fscrypt_master_keys, 6); /* 6 bits = 64 buckets */ static DEFINE_SPINLOCK(fscrypt_master_keys_lock); @@ -144,10 +142,9 @@ static struct fscrypt_mode available_modes[] = { }, [FS_ENCRYPTION_MODE_AES_128_CBC] = { .friendly_name = "AES-128-CBC", - .cipher_str = "cbc(aes)", + .cipher_str = "essiv(cbc(aes),aes,sha256)", .keysize = 16, - .ivsize = 16, - .needs_essiv = true, + .ivsize = 8, }, [FS_ENCRYPTION_MODE_AES_128_CTS] = { .friendly_name = "AES-128-CTS-CBC", @@ -377,72 +374,6 @@ fscrypt_get_master_key(const struct fscrypt_info *ci, struct fscrypt_mode *mode, return ERR_PTR(err); } -static int derive_essiv_salt(const u8 *key, int keysize, u8 *salt) -{ - struct crypto_shash *tfm = READ_ONCE(essiv_hash_tfm); - - /* init hash transform on demand */ - if (unlikely(!tfm)) { - struct crypto_shash *prev_tfm; - - tfm = crypto_alloc_shash("sha256", 0, 0); - if (IS_ERR(tfm)) { - fscrypt_warn(NULL, - "error allocating SHA-256 transform: %ld", - PTR_ERR(tfm)); - return PTR_ERR(tfm); - } - prev_tfm = cmpxchg(&essiv_hash_tfm, NULL, tfm); - if (prev_tfm) { - crypto_free_shash(tfm); - tfm = prev_tfm; - } - } - - { - SHASH_DESC_ON_STACK(desc, tfm); - desc->tfm = tfm; - - return crypto_shash_digest(desc, key, keysize, salt); - } -} - -static int init_essiv_generator(struct fscrypt_info *ci, const u8 *raw_key, - int keysize) -{ - int err; - struct crypto_cipher *essiv_tfm; - u8 salt[SHA256_DIGEST_SIZE]; - - essiv_tfm = crypto_alloc_cipher("aes", 0, 0); - if (IS_ERR(essiv_tfm)) - return PTR_ERR(essiv_tfm); - - ci->ci_essiv_tfm = essiv_tfm; - - err = derive_essiv_salt(raw_key, keysize, salt); - if (err) - goto out; - - /* - * Using SHA256 to derive the salt/key will result in AES-256 being - * used for IV generation. File contents encryption will still use the - * configured keysize (AES-128) nevertheless. - */ - err = crypto_cipher_setkey(essiv_tfm, salt, sizeof(salt)); - if (err) - goto out; - -out: - memzero_explicit(salt, sizeof(salt)); - return err; -} - -void __exit fscrypt_essiv_cleanup(void) -{ - crypto_free_shash(essiv_hash_tfm); -} - /* * Given the encryption mode and key (normally the derived key, but for * FS_POLICY_FLAG_DIRECT_KEY mode it's the master key), set up the inode's @@ -454,7 +385,6 @@ static int setup_crypto_transform(struct fscrypt_info *ci, { struct fscrypt_master_key *mk; struct crypto_skcipher *ctfm; - int err; if (ci->ci_flags & FS_POLICY_FLAG_DIRECT_KEY) { mk = fscrypt_get_master_key(ci, mode, raw_key, inode); @@ -470,19 +400,6 @@ static int setup_crypto_transform(struct fscrypt_info *ci, ci->ci_master_key = mk; ci->ci_ctfm = ctfm; - if (mode->needs_essiv) { - /* ESSIV implies 16-byte IVs which implies !DIRECT_KEY */ - WARN_ON(mode->ivsize != AES_BLOCK_SIZE); - WARN_ON(ci->ci_flags & FS_POLICY_FLAG_DIRECT_KEY); - - err = init_essiv_generator(ci, raw_key, mode->keysize); - if (err) { - fscrypt_warn(inode->i_sb, - "error initializing ESSIV generator for inode %lu: %d", - inode->i_ino, err); - return err; - } - } return 0; } @@ -495,7 +412,6 @@ static void put_crypt_info(struct fscrypt_info *ci) put_master_key(ci->ci_master_key); } else { crypto_free_skcipher(ci->ci_ctfm); - crypto_free_cipher(ci->ci_essiv_tfm); } kmem_cache_free(fscrypt_info_cachep, ci); } From patchwork Tue Jun 18 21:27:48 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ard Biesheuvel X-Patchwork-Id: 11002905 X-Patchwork-Delegate: snitzer@redhat.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4B3ED76 for ; Tue, 18 Jun 2019 21:29:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3BA0A28B5D for ; Tue, 18 Jun 2019 21:29:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3020F28B53; Tue, 18 Jun 2019 21:29:54 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C4A2E28B59 for ; Tue, 18 Jun 2019 21:29:53 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 870403092666; Tue, 18 Jun 2019 21:29:52 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.20]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 63FA93769; Tue, 18 Jun 2019 21:29:52 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id 3082C1806B1A; Tue, 18 Jun 2019 21:29:51 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id x5ILSLtb018850 for ; Tue, 18 Jun 2019 17:28:21 -0400 Received: by smtp.corp.redhat.com (Postfix) id 6C70784E4; Tue, 18 Jun 2019 21:28:21 +0000 (UTC) Delivered-To: dm-devel@redhat.com Received: from mx1.redhat.com (ext-mx14.extmail.prod.ext.phx2.redhat.com [10.5.110.43]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 674186108C for ; Tue, 18 Jun 2019 21:28:20 +0000 (UTC) Received: from mail-wr1-f66.google.com (mail-wr1-f66.google.com [209.85.221.66]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4FC3C3092673 for ; Tue, 18 Jun 2019 21:28:10 +0000 (UTC) Received: by mail-wr1-f66.google.com with SMTP id d18so1058955wrs.5 for ; Tue, 18 Jun 2019 14:28:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=GeHdLEIiKMp7/1v0iGs3g+X9QZKIHHe69xTr11ESOuo=; b=DpMBBmk2kGfOoo1UtTp/w94N831+KzjoBk3fn3kDgIehYo2zHzDHet8G50UyVgSnkj Ri7viZOAMYnfQlbiBROYFUGsC8zcCtmfXSojqaDC9MzX4vaRpw5QI1V7asBop9WLTO2j wsEA2nLW8zhKKaQAAQWnZVPMSfYDBaz3KDsD9NkzSLcwkCl3/rCc5C0YcN0DwoBmkVkU TocNSZisIrDSrXt8tigpeHNZ1KIumRySoF5YEILpwiYVKrvvJfFabZyDI3kUKVvF60am 48ebFFYnCX04XSgYR/7FBhetbNqG9K2Xiw996Fh3tdv1+8ayMXQ/loeD4ES2iuwF1b0F FXAA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=GeHdLEIiKMp7/1v0iGs3g+X9QZKIHHe69xTr11ESOuo=; b=b9y8fPSPLyWnuSa7yvzuq2GuP6O7xIEP9wWTn7p36qQyMVCQYSaiM3r91igJ2wF4a8 eR74MtZxLPPEzRJv0UeKtqfxzd6CzPK+/cp/r2A/76QcUtImnzRUh/dHFBcO4efukEsq 23hABwOtPTorPnZ5C0Yq8SH/mLvukjXYNJmd20+1qRWhJKd6raW+KbN5yp4klk6oT8iG 8aoc9HXL/wYz+xk+qGFNVZCYq9lVIa982r6MfF8gBP9zuEULXbPpuhzKnxvWOvQYI1CG P+Kk2EXQ7vM6pubP5Etqyf9nLAmGbqPE9i2TeIui/EGMJm+m5xoYDkMMAcJU7Gy8nMy9 A/ew== X-Gm-Message-State: APjAAAVM9FhuGpLKtpvt6JGxP4M4AIaEEmbtY7Lw8a0btgaZa9NldGUl h7gfnFYKRcfIKmV+ureaT4KNpQ== X-Google-Smtp-Source: APXvYqxw7UtM436v978g3jeSFj/x7lOOzeXSI5X74pZs1sDQQWNG7T4gqKgGZltyMUJ60Fow0hMRCQ== X-Received: by 2002:adf:e88e:: with SMTP id d14mr4948391wrm.189.1560893288980; Tue, 18 Jun 2019 14:28:08 -0700 (PDT) Received: from e111045-lin.arm.com (lfbn-nic-1-216-10.w2-15.abo.wanadoo.fr. [2.15.62.10]) by smtp.gmail.com with ESMTPSA id h21sm2273831wmb.47.2019.06.18.14.28.07 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Tue, 18 Jun 2019 14:28:08 -0700 (PDT) From: Ard Biesheuvel To: linux-crypto@vger.kernel.org Date: Tue, 18 Jun 2019 23:27:48 +0200 Message-Id: <20190618212749.8995-4-ard.biesheuvel@linaro.org> In-Reply-To: <20190618212749.8995-1-ard.biesheuvel@linaro.org> References: <20190618212749.8995-1-ard.biesheuvel@linaro.org> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.43]); Tue, 18 Jun 2019 21:28:11 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.43]); Tue, 18 Jun 2019 21:28:11 +0000 (UTC) for IP:'209.85.221.66' DOMAIN:'mail-wr1-f66.google.com' HELO:'mail-wr1-f66.google.com' FROM:'ard.biesheuvel@linaro.org' RCPT:'' X-RedHat-Spam-Score: -0.11 (DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE) 209.85.221.66 mail-wr1-f66.google.com 209.85.221.66 mail-wr1-f66.google.com X-Scanned-By: MIMEDefang 2.84 on 10.5.110.43 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-loop: dm-devel@redhat.com Cc: Herbert Xu , Eric Biggers , Ard Biesheuvel , linux-fscrypt@vger.kernel.org, Gilad Ben-Yossef , dm-devel@redhat.com, Milan Broz Subject: [dm-devel] [PATCH v2 3/4] md: dm-crypt: infer ESSIV block cipher from cipher string directly X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.43]); Tue, 18 Jun 2019 21:29:53 +0000 (UTC) X-Virus-Scanned: ClamAV using ClamSMTP Instead of allocating a crypto skcipher tfm 'foo' and attempting to infer the encapsulated block cipher from the driver's 'name' field, directly parse the string that we used to allocated the tfm. These are always identical (unless the allocation failed, in which case we bail anyway), but using the string allows us to use it in the allocation, which is something we will need when switching to the 'essiv' crypto API template. Signed-off-by: Ard Biesheuvel --- drivers/md/dm-crypt.c | 35 +++++++++----------- 1 file changed, 15 insertions(+), 20 deletions(-) diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index 1b16d34bb785..f001f1104cb5 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -2321,25 +2321,17 @@ static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode) * The cc->cipher is currently used only in ESSIV. * This should be probably done by crypto-api calls (once available...) */ -static int crypt_ctr_blkdev_cipher(struct crypt_config *cc) +static int crypt_ctr_blkdev_cipher(struct crypt_config *cc, char *alg_name) { - const char *alg_name = NULL; char *start, *end; if (crypt_integrity_aead(cc)) { - alg_name = crypto_tfm_alg_name(crypto_aead_tfm(any_tfm_aead(cc))); - if (!alg_name) - return -EINVAL; if (crypt_integrity_hmac(cc)) { alg_name = strchr(alg_name, ','); if (!alg_name) return -EINVAL; } alg_name++; - } else { - alg_name = crypto_tfm_alg_name(crypto_skcipher_tfm(any_tfm(cc))); - if (!alg_name) - return -EINVAL; } start = strchr(alg_name, '('); @@ -2434,6 +2426,20 @@ static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key if (*ivmode && !strcmp(*ivmode, "lmk")) cc->tfms_count = 64; + if (crypt_integrity_aead(cc)) { + ret = crypt_ctr_auth_cipher(cc, cipher_api); + if (ret < 0) { + ti->error = "Invalid AEAD cipher spec"; + return -ENOMEM; + } + } + + ret = crypt_ctr_blkdev_cipher(cc, cipher_api); + if (ret < 0) { + ti->error = "Cannot allocate cipher string"; + return -ENOMEM; + } + cc->key_parts = cc->tfms_count; /* Allocate cipher */ @@ -2445,21 +2451,10 @@ static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key /* Alloc AEAD, can be used only in new format. */ if (crypt_integrity_aead(cc)) { - ret = crypt_ctr_auth_cipher(cc, cipher_api); - if (ret < 0) { - ti->error = "Invalid AEAD cipher spec"; - return -ENOMEM; - } cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); } else cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); - ret = crypt_ctr_blkdev_cipher(cc); - if (ret < 0) { - ti->error = "Cannot allocate cipher string"; - return -ENOMEM; - } - return 0; } From patchwork Tue Jun 18 21:27:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ard Biesheuvel X-Patchwork-Id: 11002901 X-Patchwork-Delegate: snitzer@redhat.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 571AB76 for ; Tue, 18 Jun 2019 21:29:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4713328AD9 for ; Tue, 18 Jun 2019 21:29:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3B7F528B53; Tue, 18 Jun 2019 21:29:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 951C428B56 for ; Tue, 18 Jun 2019 21:29:11 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D115E356C4; Tue, 18 Jun 2019 21:28:43 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.20]) by smtp.corp.redhat.com (Postfix) with ESMTPS id ED426383F; Tue, 18 Jun 2019 21:28:35 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id 866BA1806B19; Tue, 18 Jun 2019 21:28:28 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id x5ILSP9H018878 for ; Tue, 18 Jun 2019 17:28:25 -0400 Received: by smtp.corp.redhat.com (Postfix) id C75CD19C69; Tue, 18 Jun 2019 21:28:25 +0000 (UTC) Delivered-To: dm-devel@redhat.com Received: from mx1.redhat.com (ext-mx01.extmail.prod.ext.phx2.redhat.com [10.5.110.25]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C161A19C5B for ; Tue, 18 Jun 2019 21:28:23 +0000 (UTC) Received: from mail-wm1-f68.google.com (mail-wm1-f68.google.com [209.85.128.68]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B4FF281DFA for ; Tue, 18 Jun 2019 21:28:11 +0000 (UTC) Received: by mail-wm1-f68.google.com with SMTP id s15so4732191wmj.3 for ; Tue, 18 Jun 2019 14:28:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=t1z9+TDQfHPW/smtTmewGAgWAJLuzsbWWpgKygwvzhI=; b=od4ihnPXfC0cbv6Q6JphpdB71CghciGPrihK+4yU4BrAkXSUhGty0VQ2wLQEgm86U6 CyDurd6QJWXxbBES0t+UAEIJEg9XMGlODlu9vj2x7EU2r/AMEqSZEFViG80fBJIBPB/k ++v/uVQXEHoaGsWcmHN1JHzF4qmeMGu3PF1cFk3WsG0K26DHRFM9ddJcjDBL+CBKqyJa t4EIyL/fGaHGguQyzcqMLiCfa3BHdgrMOnGTgnRtPddgL/MGl9NtdQiDh4xjpyebsA35 viQ8tvmuSK7rHDl0f781lssw1KtWjFImXmd5noxFlauDqBzaHi9VWAHQIswXlnGBmdPy jGGA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=t1z9+TDQfHPW/smtTmewGAgWAJLuzsbWWpgKygwvzhI=; b=F7sGUfmrTg3ng1BNRjKzgOscWxLPre9jZzTF/mbAHcKBUJW8jFX7BV6yUc6WvFkIa2 6aiStpYgjZJ58ayCvB+hl+IQ8SvfijwbH4+Glb6pPuo8IXKNe4YrIgzPVSrbPGDm+K5w MIocqqOeLKk7ZQw8kuunIK4kfQEDrSt7vZlN94EFctpDnfSMLgTjvkX8osL0L3Valhxn J2T/osXlMzRJbVYsWgoyuuOsXpteHLEMWC3frQeFR7FrqjJveNgvFZrfvusPDILZ5z8M bsN++rrmaqOkGiQkJlasacnQxxEzGWyxBCcbXxLGguRUWSirmSezPalgOcvCZusNavPQ D+jg== X-Gm-Message-State: APjAAAVCt7/wyBv++HuDF3Ptd7f9SgsCRsJ0YlrLRYX0XJZKk0/H8d/p CM9lHOhxEwImtoItRAynFMBQ8g== X-Google-Smtp-Source: APXvYqwO2NrP+BPLIoMEwq49uhANfaSU0kE09Ly2YfqKzrPSp5rp1ZujAVnjygP2dF542hoFv6PH9Q== X-Received: by 2002:a1c:480a:: with SMTP id v10mr5120117wma.120.1560893290234; Tue, 18 Jun 2019 14:28:10 -0700 (PDT) Received: from e111045-lin.arm.com (lfbn-nic-1-216-10.w2-15.abo.wanadoo.fr. [2.15.62.10]) by smtp.gmail.com with ESMTPSA id h21sm2273831wmb.47.2019.06.18.14.28.09 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Tue, 18 Jun 2019 14:28:09 -0700 (PDT) From: Ard Biesheuvel To: linux-crypto@vger.kernel.org Date: Tue, 18 Jun 2019 23:27:49 +0200 Message-Id: <20190618212749.8995-5-ard.biesheuvel@linaro.org> In-Reply-To: <20190618212749.8995-1-ard.biesheuvel@linaro.org> References: <20190618212749.8995-1-ard.biesheuvel@linaro.org> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Tue, 18 Jun 2019 21:28:12 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Tue, 18 Jun 2019 21:28:12 +0000 (UTC) for IP:'209.85.128.68' DOMAIN:'mail-wm1-f68.google.com' HELO:'mail-wm1-f68.google.com' FROM:'ard.biesheuvel@linaro.org' RCPT:'' X-RedHat-Spam-Score: -0.11 (DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS) 209.85.128.68 mail-wm1-f68.google.com 209.85.128.68 mail-wm1-f68.google.com X-Scanned-By: MIMEDefang 2.83 on 10.5.110.25 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-loop: dm-devel@redhat.com Cc: Herbert Xu , Eric Biggers , Ard Biesheuvel , linux-fscrypt@vger.kernel.org, Gilad Ben-Yossef , dm-devel@redhat.com, Milan Broz Subject: [dm-devel] [PATCH v2 4/4] md: dm-crypt: switch to ESSIV crypto API template X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Tue, 18 Jun 2019 21:29:07 +0000 (UTC) X-Virus-Scanned: ClamAV using ClamSMTP Replace the explicit ESSIV handling in the dm-crypt driver with calls into the crypto API, which now possesses the capability to perform this processing within the crypto subsystem. Signed-off-by: Ard Biesheuvel --- drivers/md/Kconfig | 1 + drivers/md/dm-crypt.c | 208 +++----------------- 2 files changed, 31 insertions(+), 178 deletions(-) diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index 45254b3ef715..30ca87cf25db 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -271,6 +271,7 @@ config DM_CRYPT depends on BLK_DEV_DM select CRYPTO select CRYPTO_CBC + select CRYPTO_ESSIV ---help--- This device-mapper target allows you to create a device that transparently encrypts the data on it. You'll need to activate diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index f001f1104cb5..89efd7d249fd 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -98,11 +98,6 @@ struct crypt_iv_operations { struct dm_crypt_request *dmreq); }; -struct iv_essiv_private { - struct crypto_shash *hash_tfm; - u8 *salt; -}; - struct iv_benbi_private { int shift; }; @@ -155,7 +150,6 @@ struct crypt_config { const struct crypt_iv_operations *iv_gen_ops; union { - struct iv_essiv_private essiv; struct iv_benbi_private benbi; struct iv_lmk_private lmk; struct iv_tcw_private tcw; @@ -165,8 +159,6 @@ struct crypt_config { unsigned short int sector_size; unsigned char sector_shift; - /* ESSIV: struct crypto_cipher *essiv_tfm */ - void *iv_private; union { struct crypto_skcipher **tfms; struct crypto_aead **tfms_aead; @@ -323,161 +315,6 @@ static int crypt_iv_plain64be_gen(struct crypt_config *cc, u8 *iv, return 0; } -/* Initialise ESSIV - compute salt but no local memory allocations */ -static int crypt_iv_essiv_init(struct crypt_config *cc) -{ - struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; - SHASH_DESC_ON_STACK(desc, essiv->hash_tfm); - struct crypto_cipher *essiv_tfm; - int err; - - desc->tfm = essiv->hash_tfm; - - err = crypto_shash_digest(desc, cc->key, cc->key_size, essiv->salt); - shash_desc_zero(desc); - if (err) - return err; - - essiv_tfm = cc->iv_private; - - err = crypto_cipher_setkey(essiv_tfm, essiv->salt, - crypto_shash_digestsize(essiv->hash_tfm)); - if (err) - return err; - - return 0; -} - -/* Wipe salt and reset key derived from volume key */ -static int crypt_iv_essiv_wipe(struct crypt_config *cc) -{ - struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; - unsigned salt_size = crypto_shash_digestsize(essiv->hash_tfm); - struct crypto_cipher *essiv_tfm; - int r, err = 0; - - memset(essiv->salt, 0, salt_size); - - essiv_tfm = cc->iv_private; - r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); - if (r) - err = r; - - return err; -} - -/* Allocate the cipher for ESSIV */ -static struct crypto_cipher *alloc_essiv_cipher(struct crypt_config *cc, - struct dm_target *ti, - const u8 *salt, - unsigned int saltsize) -{ - struct crypto_cipher *essiv_tfm; - int err; - - /* Setup the essiv_tfm with the given salt */ - essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, 0); - if (IS_ERR(essiv_tfm)) { - ti->error = "Error allocating crypto tfm for ESSIV"; - return essiv_tfm; - } - - if (crypto_cipher_blocksize(essiv_tfm) != cc->iv_size) { - ti->error = "Block size of ESSIV cipher does " - "not match IV size of block cipher"; - crypto_free_cipher(essiv_tfm); - return ERR_PTR(-EINVAL); - } - - err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); - if (err) { - ti->error = "Failed to set key for ESSIV cipher"; - crypto_free_cipher(essiv_tfm); - return ERR_PTR(err); - } - - return essiv_tfm; -} - -static void crypt_iv_essiv_dtr(struct crypt_config *cc) -{ - struct crypto_cipher *essiv_tfm; - struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; - - crypto_free_shash(essiv->hash_tfm); - essiv->hash_tfm = NULL; - - kzfree(essiv->salt); - essiv->salt = NULL; - - essiv_tfm = cc->iv_private; - - if (essiv_tfm) - crypto_free_cipher(essiv_tfm); - - cc->iv_private = NULL; -} - -static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, - const char *opts) -{ - struct crypto_cipher *essiv_tfm = NULL; - struct crypto_shash *hash_tfm = NULL; - u8 *salt = NULL; - int err; - - if (!opts) { - ti->error = "Digest algorithm missing for ESSIV mode"; - return -EINVAL; - } - - /* Allocate hash algorithm */ - hash_tfm = crypto_alloc_shash(opts, 0, 0); - if (IS_ERR(hash_tfm)) { - ti->error = "Error initializing ESSIV hash"; - err = PTR_ERR(hash_tfm); - goto bad; - } - - salt = kzalloc(crypto_shash_digestsize(hash_tfm), GFP_KERNEL); - if (!salt) { - ti->error = "Error kmallocing salt storage in ESSIV"; - err = -ENOMEM; - goto bad; - } - - cc->iv_gen_private.essiv.salt = salt; - cc->iv_gen_private.essiv.hash_tfm = hash_tfm; - - essiv_tfm = alloc_essiv_cipher(cc, ti, salt, - crypto_shash_digestsize(hash_tfm)); - if (IS_ERR(essiv_tfm)) { - crypt_iv_essiv_dtr(cc); - return PTR_ERR(essiv_tfm); - } - cc->iv_private = essiv_tfm; - - return 0; - -bad: - if (hash_tfm && !IS_ERR(hash_tfm)) - crypto_free_shash(hash_tfm); - kfree(salt); - return err; -} - -static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, - struct dm_crypt_request *dmreq) -{ - struct crypto_cipher *essiv_tfm = cc->iv_private; - - memset(iv, 0, cc->iv_size); - *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); - crypto_cipher_encrypt_one(essiv_tfm, iv, iv); - - return 0; -} - static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, const char *opts) { @@ -853,14 +690,6 @@ static const struct crypt_iv_operations crypt_iv_plain64be_ops = { .generator = crypt_iv_plain64be_gen }; -static const struct crypt_iv_operations crypt_iv_essiv_ops = { - .ctr = crypt_iv_essiv_ctr, - .dtr = crypt_iv_essiv_dtr, - .init = crypt_iv_essiv_init, - .wipe = crypt_iv_essiv_wipe, - .generator = crypt_iv_essiv_gen -}; - static const struct crypt_iv_operations crypt_iv_benbi_ops = { .ctr = crypt_iv_benbi_ctr, .dtr = crypt_iv_benbi_dtr, @@ -2283,7 +2112,7 @@ static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode) else if (strcmp(ivmode, "plain64be") == 0) cc->iv_gen_ops = &crypt_iv_plain64be_ops; else if (strcmp(ivmode, "essiv") == 0) - cc->iv_gen_ops = &crypt_iv_essiv_ops; + cc->iv_gen_ops = &crypt_iv_plain64_ops; else if (strcmp(ivmode, "benbi") == 0) cc->iv_gen_ops = &crypt_iv_benbi_ops; else if (strcmp(ivmode, "null") == 0) @@ -2397,7 +2226,7 @@ static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key char **ivmode, char **ivopts) { struct crypt_config *cc = ti->private; - char *tmp, *cipher_api; + char *tmp, *cipher_api, buf[CRYPTO_MAX_ALG_NAME]; int ret = -EINVAL; cc->tfms_count = 1; @@ -2435,9 +2264,19 @@ static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key } ret = crypt_ctr_blkdev_cipher(cc, cipher_api); - if (ret < 0) { - ti->error = "Cannot allocate cipher string"; - return -ENOMEM; + if (ret < 0) + goto bad_mem; + + if (*ivmode && !strcmp(*ivmode, "essiv")) { + if (!*ivopts) { + ti->error = "Digest algorithm missing for ESSIV mode"; + return -EINVAL; + } + ret = snprintf(buf, CRYPTO_MAX_ALG_NAME, "essiv(%s,%s,%s)", + cipher_api, cc->cipher, *ivopts); + if (ret < 0) + goto bad_mem; + cipher_api = buf; } cc->key_parts = cc->tfms_count; @@ -2456,6 +2295,9 @@ static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); return 0; +bad_mem: + ti->error = "Cannot allocate cipher string"; + return -ENOMEM; } static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key, @@ -2515,8 +2357,18 @@ static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key if (!cipher_api) goto bad_mem; - ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, - "%s(%s)", chainmode, cipher); + if (!strcmp(*ivmode, "essiv")) { + if (!*ivopts) { + ti->error = "Digest algorithm missing for ESSIV mode"; + return -EINVAL; + } + ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, + "essiv(%s(%s),%s,%s)", chainmode, cipher, + cipher, *ivopts); + } else { + ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, + "%s(%s)", chainmode, cipher); + } if (ret < 0) { kfree(cipher_api); goto bad_mem;