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![Herbert Xu](/assets/img/avatar_default.png)
This patch does the final flag day conversion of all completion functions which are now all contained in the Crypto API. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
652 lines
18 KiB
C
652 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ESSIV skcipher and aead template for block encryption
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*
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* This template encapsulates the ESSIV IV generation algorithm used by
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* dm-crypt and fscrypt, which converts the initial vector for the skcipher
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* used for block encryption, by encrypting it using the hash of the
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* skcipher key as encryption key. Usually, the input IV is a 64-bit sector
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* number in LE representation zero-padded to the size of the IV, but this
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* is not assumed by this driver.
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*
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* The typical use of this template is to instantiate the skcipher
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* 'essiv(cbc(aes),sha256)', which is the only instantiation used by
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* fscrypt, and the most relevant one for dm-crypt. However, dm-crypt
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* also permits ESSIV to be used in combination with the authenc template,
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* e.g., 'essiv(authenc(hmac(sha256),cbc(aes)),sha256)', in which case
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* we need to instantiate an aead that accepts the same special key format
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* as the authenc template, and deals with the way the encrypted IV is
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* embedded into the AAD area of the aead request. This means the AEAD
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* flavor produced by this template is tightly coupled to the way dm-crypt
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* happens to use it.
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*
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* Copyright (c) 2019 Linaro, Ltd. <ard.biesheuvel@linaro.org>
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*
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* Heavily based on:
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* adiantum length-preserving encryption mode
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*
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* Copyright 2018 Google LLC
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*/
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#include <crypto/authenc.h>
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#include <crypto/internal/aead.h>
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#include <crypto/internal/cipher.h>
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#include <crypto/internal/hash.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/scatterwalk.h>
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#include <linux/module.h>
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#include "internal.h"
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struct essiv_instance_ctx {
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union {
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struct crypto_skcipher_spawn skcipher_spawn;
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struct crypto_aead_spawn aead_spawn;
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} u;
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char essiv_cipher_name[CRYPTO_MAX_ALG_NAME];
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char shash_driver_name[CRYPTO_MAX_ALG_NAME];
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};
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struct essiv_tfm_ctx {
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union {
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struct crypto_skcipher *skcipher;
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struct crypto_aead *aead;
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} u;
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struct crypto_cipher *essiv_cipher;
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struct crypto_shash *hash;
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int ivoffset;
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};
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struct essiv_aead_request_ctx {
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struct scatterlist sg[4];
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u8 *assoc;
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struct aead_request aead_req;
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};
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static int essiv_skcipher_setkey(struct crypto_skcipher *tfm,
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const u8 *key, unsigned int keylen)
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{
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struct essiv_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
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u8 salt[HASH_MAX_DIGESTSIZE];
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int err;
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crypto_skcipher_clear_flags(tctx->u.skcipher, CRYPTO_TFM_REQ_MASK);
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crypto_skcipher_set_flags(tctx->u.skcipher,
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crypto_skcipher_get_flags(tfm) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_skcipher_setkey(tctx->u.skcipher, key, keylen);
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if (err)
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return err;
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err = crypto_shash_tfm_digest(tctx->hash, key, keylen, salt);
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if (err)
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return err;
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crypto_cipher_clear_flags(tctx->essiv_cipher, CRYPTO_TFM_REQ_MASK);
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crypto_cipher_set_flags(tctx->essiv_cipher,
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crypto_skcipher_get_flags(tfm) &
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CRYPTO_TFM_REQ_MASK);
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return crypto_cipher_setkey(tctx->essiv_cipher, salt,
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crypto_shash_digestsize(tctx->hash));
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}
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static int essiv_aead_setkey(struct crypto_aead *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct essiv_tfm_ctx *tctx = crypto_aead_ctx(tfm);
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SHASH_DESC_ON_STACK(desc, tctx->hash);
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struct crypto_authenc_keys keys;
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u8 salt[HASH_MAX_DIGESTSIZE];
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int err;
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crypto_aead_clear_flags(tctx->u.aead, CRYPTO_TFM_REQ_MASK);
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crypto_aead_set_flags(tctx->u.aead, crypto_aead_get_flags(tfm) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_aead_setkey(tctx->u.aead, key, keylen);
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if (err)
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return err;
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if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
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return -EINVAL;
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desc->tfm = tctx->hash;
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err = crypto_shash_init(desc) ?:
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crypto_shash_update(desc, keys.enckey, keys.enckeylen) ?:
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crypto_shash_finup(desc, keys.authkey, keys.authkeylen, salt);
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if (err)
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return err;
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crypto_cipher_clear_flags(tctx->essiv_cipher, CRYPTO_TFM_REQ_MASK);
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crypto_cipher_set_flags(tctx->essiv_cipher, crypto_aead_get_flags(tfm) &
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CRYPTO_TFM_REQ_MASK);
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return crypto_cipher_setkey(tctx->essiv_cipher, salt,
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crypto_shash_digestsize(tctx->hash));
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}
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static int essiv_aead_setauthsize(struct crypto_aead *tfm,
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unsigned int authsize)
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{
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struct essiv_tfm_ctx *tctx = crypto_aead_ctx(tfm);
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return crypto_aead_setauthsize(tctx->u.aead, authsize);
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}
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static void essiv_skcipher_done(void *data, int err)
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{
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struct skcipher_request *req = data;
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skcipher_request_complete(req, err);
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}
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static int essiv_skcipher_crypt(struct skcipher_request *req, bool enc)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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const struct essiv_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
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struct skcipher_request *subreq = skcipher_request_ctx(req);
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crypto_cipher_encrypt_one(tctx->essiv_cipher, req->iv, req->iv);
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skcipher_request_set_tfm(subreq, tctx->u.skcipher);
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skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
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req->iv);
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skcipher_request_set_callback(subreq, skcipher_request_flags(req),
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essiv_skcipher_done, req);
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return enc ? crypto_skcipher_encrypt(subreq) :
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crypto_skcipher_decrypt(subreq);
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}
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static int essiv_skcipher_encrypt(struct skcipher_request *req)
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{
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return essiv_skcipher_crypt(req, true);
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}
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static int essiv_skcipher_decrypt(struct skcipher_request *req)
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{
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return essiv_skcipher_crypt(req, false);
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}
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static void essiv_aead_done(void *data, int err)
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{
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struct aead_request *req = data;
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struct essiv_aead_request_ctx *rctx = aead_request_ctx(req);
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if (err == -EINPROGRESS)
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goto out;
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kfree(rctx->assoc);
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out:
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aead_request_complete(req, err);
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}
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static int essiv_aead_crypt(struct aead_request *req, bool enc)
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{
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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const struct essiv_tfm_ctx *tctx = crypto_aead_ctx(tfm);
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struct essiv_aead_request_ctx *rctx = aead_request_ctx(req);
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struct aead_request *subreq = &rctx->aead_req;
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struct scatterlist *src = req->src;
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int err;
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crypto_cipher_encrypt_one(tctx->essiv_cipher, req->iv, req->iv);
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/*
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* dm-crypt embeds the sector number and the IV in the AAD region, so
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* we have to copy the converted IV into the right scatterlist before
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* we pass it on.
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*/
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rctx->assoc = NULL;
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if (req->src == req->dst || !enc) {
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scatterwalk_map_and_copy(req->iv, req->dst,
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req->assoclen - crypto_aead_ivsize(tfm),
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crypto_aead_ivsize(tfm), 1);
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} else {
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u8 *iv = (u8 *)aead_request_ctx(req) + tctx->ivoffset;
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int ivsize = crypto_aead_ivsize(tfm);
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int ssize = req->assoclen - ivsize;
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struct scatterlist *sg;
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int nents;
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if (ssize < 0)
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return -EINVAL;
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nents = sg_nents_for_len(req->src, ssize);
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if (nents < 0)
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return -EINVAL;
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memcpy(iv, req->iv, ivsize);
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sg_init_table(rctx->sg, 4);
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if (unlikely(nents > 1)) {
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/*
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* This is a case that rarely occurs in practice, but
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* for correctness, we have to deal with it nonetheless.
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*/
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rctx->assoc = kmalloc(ssize, GFP_ATOMIC);
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if (!rctx->assoc)
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return -ENOMEM;
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scatterwalk_map_and_copy(rctx->assoc, req->src, 0,
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ssize, 0);
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sg_set_buf(rctx->sg, rctx->assoc, ssize);
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} else {
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sg_set_page(rctx->sg, sg_page(req->src), ssize,
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req->src->offset);
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}
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sg_set_buf(rctx->sg + 1, iv, ivsize);
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sg = scatterwalk_ffwd(rctx->sg + 2, req->src, req->assoclen);
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if (sg != rctx->sg + 2)
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sg_chain(rctx->sg, 3, sg);
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src = rctx->sg;
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}
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aead_request_set_tfm(subreq, tctx->u.aead);
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aead_request_set_ad(subreq, req->assoclen);
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aead_request_set_callback(subreq, aead_request_flags(req),
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essiv_aead_done, req);
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aead_request_set_crypt(subreq, src, req->dst, req->cryptlen, req->iv);
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err = enc ? crypto_aead_encrypt(subreq) :
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crypto_aead_decrypt(subreq);
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if (rctx->assoc && err != -EINPROGRESS && err != -EBUSY)
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kfree(rctx->assoc);
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return err;
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}
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static int essiv_aead_encrypt(struct aead_request *req)
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{
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return essiv_aead_crypt(req, true);
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}
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static int essiv_aead_decrypt(struct aead_request *req)
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{
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return essiv_aead_crypt(req, false);
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}
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static int essiv_init_tfm(struct essiv_instance_ctx *ictx,
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struct essiv_tfm_ctx *tctx)
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{
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struct crypto_cipher *essiv_cipher;
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struct crypto_shash *hash;
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int err;
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essiv_cipher = crypto_alloc_cipher(ictx->essiv_cipher_name, 0, 0);
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if (IS_ERR(essiv_cipher))
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return PTR_ERR(essiv_cipher);
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hash = crypto_alloc_shash(ictx->shash_driver_name, 0, 0);
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if (IS_ERR(hash)) {
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err = PTR_ERR(hash);
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goto err_free_essiv_cipher;
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}
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tctx->essiv_cipher = essiv_cipher;
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tctx->hash = hash;
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return 0;
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err_free_essiv_cipher:
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crypto_free_cipher(essiv_cipher);
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return err;
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}
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static int essiv_skcipher_init_tfm(struct crypto_skcipher *tfm)
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{
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struct skcipher_instance *inst = skcipher_alg_instance(tfm);
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struct essiv_instance_ctx *ictx = skcipher_instance_ctx(inst);
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struct essiv_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
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struct crypto_skcipher *skcipher;
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int err;
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skcipher = crypto_spawn_skcipher(&ictx->u.skcipher_spawn);
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if (IS_ERR(skcipher))
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return PTR_ERR(skcipher);
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crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
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crypto_skcipher_reqsize(skcipher));
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err = essiv_init_tfm(ictx, tctx);
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if (err) {
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crypto_free_skcipher(skcipher);
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return err;
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}
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tctx->u.skcipher = skcipher;
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return 0;
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}
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static int essiv_aead_init_tfm(struct crypto_aead *tfm)
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{
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struct aead_instance *inst = aead_alg_instance(tfm);
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struct essiv_instance_ctx *ictx = aead_instance_ctx(inst);
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struct essiv_tfm_ctx *tctx = crypto_aead_ctx(tfm);
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struct crypto_aead *aead;
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unsigned int subreq_size;
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int err;
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BUILD_BUG_ON(offsetofend(struct essiv_aead_request_ctx, aead_req) !=
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sizeof(struct essiv_aead_request_ctx));
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aead = crypto_spawn_aead(&ictx->u.aead_spawn);
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if (IS_ERR(aead))
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return PTR_ERR(aead);
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subreq_size = sizeof_field(struct essiv_aead_request_ctx, aead_req) +
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crypto_aead_reqsize(aead);
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tctx->ivoffset = offsetof(struct essiv_aead_request_ctx, aead_req) +
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subreq_size;
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crypto_aead_set_reqsize(tfm, tctx->ivoffset + crypto_aead_ivsize(aead));
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err = essiv_init_tfm(ictx, tctx);
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if (err) {
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crypto_free_aead(aead);
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return err;
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}
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tctx->u.aead = aead;
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return 0;
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}
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static void essiv_skcipher_exit_tfm(struct crypto_skcipher *tfm)
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{
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struct essiv_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
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crypto_free_skcipher(tctx->u.skcipher);
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crypto_free_cipher(tctx->essiv_cipher);
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crypto_free_shash(tctx->hash);
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}
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static void essiv_aead_exit_tfm(struct crypto_aead *tfm)
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{
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struct essiv_tfm_ctx *tctx = crypto_aead_ctx(tfm);
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crypto_free_aead(tctx->u.aead);
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crypto_free_cipher(tctx->essiv_cipher);
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crypto_free_shash(tctx->hash);
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}
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static void essiv_skcipher_free_instance(struct skcipher_instance *inst)
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{
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struct essiv_instance_ctx *ictx = skcipher_instance_ctx(inst);
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crypto_drop_skcipher(&ictx->u.skcipher_spawn);
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kfree(inst);
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}
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static void essiv_aead_free_instance(struct aead_instance *inst)
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{
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struct essiv_instance_ctx *ictx = aead_instance_ctx(inst);
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crypto_drop_aead(&ictx->u.aead_spawn);
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kfree(inst);
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}
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static bool parse_cipher_name(char *essiv_cipher_name, const char *cra_name)
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{
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const char *p, *q;
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int len;
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/* find the last opening parens */
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p = strrchr(cra_name, '(');
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if (!p++)
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return false;
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/* find the first closing parens in the tail of the string */
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q = strchr(p, ')');
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if (!q)
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return false;
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len = q - p;
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if (len >= CRYPTO_MAX_ALG_NAME)
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return false;
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memcpy(essiv_cipher_name, p, len);
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essiv_cipher_name[len] = '\0';
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return true;
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}
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static bool essiv_supported_algorithms(const char *essiv_cipher_name,
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struct shash_alg *hash_alg,
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int ivsize)
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{
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struct crypto_alg *alg;
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bool ret = false;
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alg = crypto_alg_mod_lookup(essiv_cipher_name,
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CRYPTO_ALG_TYPE_CIPHER,
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CRYPTO_ALG_TYPE_MASK);
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if (IS_ERR(alg))
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return false;
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if (hash_alg->digestsize < alg->cra_cipher.cia_min_keysize ||
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hash_alg->digestsize > alg->cra_cipher.cia_max_keysize)
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goto out;
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if (ivsize != alg->cra_blocksize)
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goto out;
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if (crypto_shash_alg_needs_key(hash_alg))
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goto out;
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ret = true;
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out:
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crypto_mod_put(alg);
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return ret;
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}
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static int essiv_create(struct crypto_template *tmpl, struct rtattr **tb)
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{
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struct crypto_attr_type *algt;
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const char *inner_cipher_name;
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const char *shash_name;
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struct skcipher_instance *skcipher_inst = NULL;
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struct aead_instance *aead_inst = NULL;
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struct crypto_instance *inst;
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struct crypto_alg *base, *block_base;
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struct essiv_instance_ctx *ictx;
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struct skcipher_alg *skcipher_alg = NULL;
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struct aead_alg *aead_alg = NULL;
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struct crypto_alg *_hash_alg;
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struct shash_alg *hash_alg;
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int ivsize;
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u32 type;
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u32 mask;
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int err;
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algt = crypto_get_attr_type(tb);
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if (IS_ERR(algt))
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return PTR_ERR(algt);
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inner_cipher_name = crypto_attr_alg_name(tb[1]);
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if (IS_ERR(inner_cipher_name))
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return PTR_ERR(inner_cipher_name);
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shash_name = crypto_attr_alg_name(tb[2]);
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if (IS_ERR(shash_name))
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return PTR_ERR(shash_name);
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type = algt->type & algt->mask;
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mask = crypto_algt_inherited_mask(algt);
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switch (type) {
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case CRYPTO_ALG_TYPE_SKCIPHER:
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skcipher_inst = kzalloc(sizeof(*skcipher_inst) +
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sizeof(*ictx), GFP_KERNEL);
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if (!skcipher_inst)
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return -ENOMEM;
|
|
inst = skcipher_crypto_instance(skcipher_inst);
|
|
base = &skcipher_inst->alg.base;
|
|
ictx = crypto_instance_ctx(inst);
|
|
|
|
/* Symmetric cipher, e.g., "cbc(aes)" */
|
|
err = crypto_grab_skcipher(&ictx->u.skcipher_spawn, inst,
|
|
inner_cipher_name, 0, mask);
|
|
if (err)
|
|
goto out_free_inst;
|
|
skcipher_alg = crypto_spawn_skcipher_alg(&ictx->u.skcipher_spawn);
|
|
block_base = &skcipher_alg->base;
|
|
ivsize = crypto_skcipher_alg_ivsize(skcipher_alg);
|
|
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))" */
|
|
err = crypto_grab_aead(&ictx->u.aead_spawn, inst,
|
|
inner_cipher_name, 0, mask);
|
|
if (err)
|
|
goto out_free_inst;
|
|
aead_alg = crypto_spawn_aead_alg(&ictx->u.aead_spawn);
|
|
block_base = &aead_alg->base;
|
|
if (!strstarts(block_base->cra_name, "authenc(")) {
|
|
pr_warn("Only authenc() type AEADs are supported by ESSIV\n");
|
|
err = -EINVAL;
|
|
goto out_drop_skcipher;
|
|
}
|
|
ivsize = aead_alg->ivsize;
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!parse_cipher_name(ictx->essiv_cipher_name, block_base->cra_name)) {
|
|
pr_warn("Failed to parse ESSIV cipher name from skcipher cra_name\n");
|
|
err = -EINVAL;
|
|
goto out_drop_skcipher;
|
|
}
|
|
|
|
/* Synchronous hash, e.g., "sha256" */
|
|
_hash_alg = crypto_alg_mod_lookup(shash_name,
|
|
CRYPTO_ALG_TYPE_SHASH,
|
|
CRYPTO_ALG_TYPE_MASK | mask);
|
|
if (IS_ERR(_hash_alg)) {
|
|
err = PTR_ERR(_hash_alg);
|
|
goto out_drop_skcipher;
|
|
}
|
|
hash_alg = __crypto_shash_alg(_hash_alg);
|
|
|
|
/* Check the set of algorithms */
|
|
if (!essiv_supported_algorithms(ictx->essiv_cipher_name, hash_alg,
|
|
ivsize)) {
|
|
pr_warn("Unsupported essiv instantiation: essiv(%s,%s)\n",
|
|
block_base->cra_name, hash_alg->base.cra_name);
|
|
err = -EINVAL;
|
|
goto out_free_hash;
|
|
}
|
|
|
|
/* record the driver name so we can instantiate this exact algo later */
|
|
strscpy(ictx->shash_driver_name, hash_alg->base.cra_driver_name,
|
|
CRYPTO_MAX_ALG_NAME);
|
|
|
|
/* Instance fields */
|
|
|
|
err = -ENAMETOOLONG;
|
|
if (snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME,
|
|
"essiv(%s,%s)", block_base->cra_name,
|
|
hash_alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
|
|
goto out_free_hash;
|
|
if (snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME,
|
|
"essiv(%s,%s)", block_base->cra_driver_name,
|
|
hash_alg->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
|
|
goto out_free_hash;
|
|
|
|
/*
|
|
* hash_alg wasn't gotten via crypto_grab*(), so we need to inherit its
|
|
* flags manually.
|
|
*/
|
|
base->cra_flags |= (hash_alg->base.cra_flags &
|
|
CRYPTO_ALG_INHERITED_FLAGS);
|
|
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_SKCIPHER) {
|
|
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(skcipher_alg);
|
|
skcipher_inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(skcipher_alg);
|
|
skcipher_inst->alg.ivsize = ivsize;
|
|
skcipher_inst->alg.chunksize = crypto_skcipher_alg_chunksize(skcipher_alg);
|
|
skcipher_inst->alg.walksize = crypto_skcipher_alg_walksize(skcipher_alg);
|
|
|
|
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 = ivsize;
|
|
aead_inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(aead_alg);
|
|
aead_inst->alg.chunksize = crypto_aead_alg_chunksize(aead_alg);
|
|
|
|
aead_inst->free = essiv_aead_free_instance;
|
|
|
|
err = aead_register_instance(tmpl, aead_inst);
|
|
}
|
|
|
|
if (err)
|
|
goto out_free_hash;
|
|
|
|
crypto_mod_put(_hash_alg);
|
|
return 0;
|
|
|
|
out_free_hash:
|
|
crypto_mod_put(_hash_alg);
|
|
out_drop_skcipher:
|
|
if (type == CRYPTO_ALG_TYPE_SKCIPHER)
|
|
crypto_drop_skcipher(&ictx->u.skcipher_spawn);
|
|
else
|
|
crypto_drop_aead(&ictx->u.aead_spawn);
|
|
out_free_inst:
|
|
kfree(skcipher_inst);
|
|
kfree(aead_inst);
|
|
return err;
|
|
}
|
|
|
|
/* 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");
|
|
MODULE_IMPORT_NS(CRYPTO_INTERNAL);
|