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[213.175.37.10]) by smtp.googlemail.com with ESMTPSA id z25sm3533319wmf.38.2019.07.09.06.22.27 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Tue, 09 Jul 2019 06:22:27 -0700 (PDT) From: Milan Broz To: dm-devel@redhat.com Date: Tue, 9 Jul 2019 15:22:14 +0200 Message-Id: <20190709132214.3905-3-gmazyland@gmail.com> In-Reply-To: <20190709132214.3905-1-gmazyland@gmail.com> References: <20190709132214.3905-1-gmazyland@gmail.com> MIME-Version: 1.0 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.44]); Tue, 09 Jul 2019 13:22:30 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.44]); Tue, 09 Jul 2019 13:22:30 +0000 (UTC) for IP:'209.85.221.68' DOMAIN:'mail-wr1-f68.google.com' HELO:'mail-wr1-f68.google.com' FROM:'gmazyland@gmail.com' RCPT:'' X-RedHat-Spam-Score: 1.229 * (DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, FREEMAIL_FROM, PDS_NO_HELO_DNS, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE) 209.85.221.68 mail-wr1-f68.google.com 209.85.221.68 mail-wr1-f68.google.com X-Scanned-By: MIMEDefang 2.84 on 10.5.110.44 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-loop: dm-devel@redhat.com Cc: Milan Broz Subject: [dm-devel] [PATCH v2 3/3] dm-crypt: Implement eboiv - encrypted byte-offset initialization vector. 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: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Tue, 09 Jul 2019 13:23:47 +0000 (UTC) X-Virus-Scanned: ClamAV using ClamSMTP This IV is used in some BitLocker devices with CBC encryption mode. IV is encrypted little-endian byte-offset (with the same key and cipher as the volume). Signed-off-by: Milan Broz --- drivers/md/dm-crypt.c | 82 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 81 insertions(+), 1 deletion(-) diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index c567e13a0e5f..0443a925840b 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -120,6 +120,10 @@ struct iv_tcw_private { u8 *whitening; }; +struct iv_eboiv_private { + struct crypto_cipher *tfm; +}; + /* * Crypt: maps a linear range of a block device * and encrypts / decrypts at the same time. @@ -159,6 +163,7 @@ struct crypt_config { struct iv_benbi_private benbi; struct iv_lmk_private lmk; struct iv_tcw_private tcw; + struct iv_eboiv_private eboiv; } iv_gen_private; u64 iv_offset; unsigned int iv_size; @@ -290,6 +295,10 @@ static struct crypto_aead *any_tfm_aead(struct crypt_config *cc) * is calculated from initial key, sector number and mixed using CRC32. * Note that this encryption scheme is vulnerable to watermarking attacks * and should be used for old compatible containers access only. + * + * eboiv: Encrypted byte-offset IV (used in Bitlocker in CBC mode) + * The IV is encrypted little-endian byte-offset (with the same key + * and cipher as the volume). */ static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, @@ -838,6 +847,67 @@ static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv, return 0; } +static void crypt_iv_eboiv_dtr(struct crypt_config *cc) +{ + struct iv_eboiv_private *eboiv = &cc->iv_gen_private.eboiv; + + crypto_free_cipher(eboiv->tfm); + eboiv->tfm = NULL; +} + +static int crypt_iv_eboiv_ctr(struct crypt_config *cc, struct dm_target *ti, + const char *opts) +{ + struct iv_eboiv_private *eboiv = &cc->iv_gen_private.eboiv; + struct crypto_cipher *tfm; + + tfm = crypto_alloc_cipher(cc->cipher, 0, 0); + if (IS_ERR(tfm)) { + ti->error = "Error allocating crypto tfm for EBOIV"; + return PTR_ERR(tfm); + } + + if (crypto_cipher_blocksize(tfm) != cc->iv_size) { + ti->error = "Block size of EBOIV cipher does " + "not match IV size of block cipher"; + crypto_free_cipher(tfm); + return -EINVAL; + } + + eboiv->tfm = tfm; + return 0; +} + +static int crypt_iv_eboiv_init(struct crypt_config *cc) +{ + struct iv_eboiv_private *eboiv = &cc->iv_gen_private.eboiv; + int err; + + err = crypto_cipher_setkey(eboiv->tfm, cc->key, cc->key_size); + if (err) + return err; + + return 0; +} + +static int crypt_iv_eboiv_wipe(struct crypt_config *cc) +{ + /* Called after cc->key is set to random key in crypt_wipe() */ + return crypt_iv_eboiv_init(cc); +} + +static int crypt_iv_eboiv_gen(struct crypt_config *cc, u8 *iv, + struct dm_crypt_request *dmreq) +{ + struct iv_eboiv_private *eboiv = &cc->iv_gen_private.eboiv; + + memset(iv, 0, cc->iv_size); + *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector * cc->sector_size); + crypto_cipher_encrypt_one(eboiv->tfm, iv, iv); + + return 0; +} + static const struct crypt_iv_operations crypt_iv_plain_ops = { .generator = crypt_iv_plain_gen }; @@ -890,6 +960,14 @@ static struct crypt_iv_operations crypt_iv_random_ops = { .generator = crypt_iv_random_gen }; +static struct crypt_iv_operations crypt_iv_eboiv_ops = { + .ctr = crypt_iv_eboiv_ctr, + .dtr = crypt_iv_eboiv_dtr, + .init = crypt_iv_eboiv_init, + .wipe = crypt_iv_eboiv_wipe, + .generator = crypt_iv_eboiv_gen +}; + /* * Integrity extensions */ @@ -2293,6 +2371,8 @@ static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode) cc->iv_gen_ops = &crypt_iv_benbi_ops; else if (strcmp(ivmode, "null") == 0) cc->iv_gen_ops = &crypt_iv_null_ops; + else if (strcmp(ivmode, "eboiv") == 0) + cc->iv_gen_ops = &crypt_iv_eboiv_ops; else if (strcmp(ivmode, "lmk") == 0) { cc->iv_gen_ops = &crypt_iv_lmk_ops; /* @@ -3093,7 +3173,7 @@ static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits) static struct target_type crypt_target = { .name = "crypt", - .version = {1, 18, 1}, + .version = {1, 19, 0}, .module = THIS_MODULE, .ctr = crypt_ctr, .dtr = crypt_dtr,