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- // SPDX-License-Identifier: GPL-2.0
- /*
- * ESSIV skcipher and aead template for block encryption
- *
- * This template encapsulates the ESSIV IV generation algorithm used by
- * dm-crypt and fscrypt, which converts the initial vector for the skcipher
- * used for block encryption, by encrypting it using the hash of the
- * skcipher key as encryption key. Usually, the input IV is a 64-bit sector
- * number in LE representation zero-padded to the size of the IV, but this
- * is not assumed by this driver.
- *
- * The typical use of this template is to instantiate the skcipher
- * 'essiv(cbc(aes),sha256)', which is the only instantiation used by
- * fscrypt, and the most relevant one for dm-crypt. However, dm-crypt
- * also permits ESSIV to be used in combination with the authenc template,
- * e.g., 'essiv(authenc(hmac(sha256),cbc(aes)),sha256)', in which case
- * we need to instantiate an aead that accepts the same special key format
- * as the authenc template, and deals with the way the encrypted IV is
- * embedded into the AAD area of the aead request. This means the AEAD
- * flavor produced by this template is tightly coupled to the way dm-crypt
- * happens to use it.
- *
- * Copyright (c) 2019 Linaro, Ltd. <[email protected]>
- *
- * Heavily based on:
- * adiantum length-preserving encryption mode
- *
- * Copyright 2018 Google LLC
- */
- #include <crypto/authenc.h>
- #include <crypto/internal/aead.h>
- #include <crypto/internal/cipher.h>
- #include <crypto/internal/hash.h>
- #include <crypto/internal/skcipher.h>
- #include <crypto/scatterwalk.h>
- #include <linux/module.h>
- #include "internal.h"
- struct essiv_instance_ctx {
- union {
- struct crypto_skcipher_spawn skcipher_spawn;
- struct crypto_aead_spawn aead_spawn;
- } u;
- char essiv_cipher_name[CRYPTO_MAX_ALG_NAME];
- char shash_driver_name[CRYPTO_MAX_ALG_NAME];
- };
- struct essiv_tfm_ctx {
- union {
- struct crypto_skcipher *skcipher;
- struct crypto_aead *aead;
- } u;
- struct crypto_cipher *essiv_cipher;
- struct crypto_shash *hash;
- int ivoffset;
- };
- struct essiv_aead_request_ctx {
- struct scatterlist sg[4];
- u8 *assoc;
- struct aead_request aead_req;
- };
- static int essiv_skcipher_setkey(struct crypto_skcipher *tfm,
- const u8 *key, unsigned int keylen)
- {
- struct essiv_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
- u8 salt[HASH_MAX_DIGESTSIZE];
- int err;
- crypto_skcipher_clear_flags(tctx->u.skcipher, CRYPTO_TFM_REQ_MASK);
- crypto_skcipher_set_flags(tctx->u.skcipher,
- crypto_skcipher_get_flags(tfm) &
- CRYPTO_TFM_REQ_MASK);
- err = crypto_skcipher_setkey(tctx->u.skcipher, key, keylen);
- if (err)
- return err;
- err = crypto_shash_tfm_digest(tctx->hash, key, keylen, salt);
- if (err)
- return err;
- crypto_cipher_clear_flags(tctx->essiv_cipher, CRYPTO_TFM_REQ_MASK);
- crypto_cipher_set_flags(tctx->essiv_cipher,
- crypto_skcipher_get_flags(tfm) &
- CRYPTO_TFM_REQ_MASK);
- return crypto_cipher_setkey(tctx->essiv_cipher, salt,
- crypto_shash_digestsize(tctx->hash));
- }
- 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;
- u8 salt[HASH_MAX_DIGESTSIZE];
- 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);
- if (err)
- return err;
- if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
- return -EINVAL;
- desc->tfm = tctx->hash;
- err = crypto_shash_init(desc) ?:
- crypto_shash_update(desc, keys.enckey, keys.enckeylen) ?:
- crypto_shash_finup(desc, keys.authkey, keys.authkeylen, salt);
- if (err)
- return err;
- 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);
- return crypto_cipher_setkey(tctx->essiv_cipher, salt,
- crypto_shash_digestsize(tctx->hash));
- }
- 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 int essiv_skcipher_crypt(struct skcipher_request *req, bool enc)
- {
- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- const struct essiv_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
- struct skcipher_request *subreq = skcipher_request_ctx(req);
- crypto_cipher_encrypt_one(tctx->essiv_cipher, req->iv, req->iv);
- skcipher_request_set_tfm(subreq, tctx->u.skcipher);
- skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
- req->iv);
- skcipher_request_set_callback(subreq, skcipher_request_flags(req),
- essiv_skcipher_done, req);
- return enc ? crypto_skcipher_encrypt(subreq) :
- crypto_skcipher_decrypt(subreq);
- }
- static int essiv_skcipher_encrypt(struct skcipher_request *req)
- {
- return essiv_skcipher_crypt(req, true);
- }
- static int essiv_skcipher_decrypt(struct skcipher_request *req)
- {
- return essiv_skcipher_crypt(req, false);
- }
- static void essiv_aead_done(struct crypto_async_request *areq, int err)
- {
- struct aead_request *req = areq->data;
- struct essiv_aead_request_ctx *rctx = aead_request_ctx(req);
- if (err == -EINPROGRESS)
- goto out;
- kfree(rctx->assoc);
- out:
- aead_request_complete(req, err);
- }
- static int essiv_aead_crypt(struct aead_request *req, bool enc)
- {
- 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);
- struct aead_request *subreq = &rctx->aead_req;
- struct scatterlist *src = req->src;
- int err;
- crypto_cipher_encrypt_one(tctx->essiv_cipher, req->iv, req->iv);
- /*
- * dm-crypt embeds the sector number and the IV in the AAD region, so
- * we have to copy the converted IV into the right scatterlist before
- * we pass it on.
- */
- rctx->assoc = NULL;
- if (req->src == req->dst || !enc) {
- scatterwalk_map_and_copy(req->iv, req->dst,
- req->assoclen - crypto_aead_ivsize(tfm),
- crypto_aead_ivsize(tfm), 1);
- } else {
- u8 *iv = (u8 *)aead_request_ctx(req) + tctx->ivoffset;
- int ivsize = crypto_aead_ivsize(tfm);
- int ssize = req->assoclen - ivsize;
- struct scatterlist *sg;
- int nents;
- if (ssize < 0)
- return -EINVAL;
- nents = sg_nents_for_len(req->src, ssize);
- if (nents < 0)
- return -EINVAL;
- memcpy(iv, req->iv, ivsize);
- sg_init_table(rctx->sg, 4);
- if (unlikely(nents > 1)) {
- /*
- * This is a case that rarely occurs in practice, but
- * for correctness, we have to deal with it nonetheless.
- */
- rctx->assoc = kmalloc(ssize, GFP_ATOMIC);
- if (!rctx->assoc)
- return -ENOMEM;
- scatterwalk_map_and_copy(rctx->assoc, req->src, 0,
- ssize, 0);
- sg_set_buf(rctx->sg, rctx->assoc, ssize);
- } else {
- sg_set_page(rctx->sg, sg_page(req->src), ssize,
- req->src->offset);
- }
- sg_set_buf(rctx->sg + 1, iv, ivsize);
- sg = scatterwalk_ffwd(rctx->sg + 2, req->src, req->assoclen);
- if (sg != rctx->sg + 2)
- sg_chain(rctx->sg, 3, sg);
- src = rctx->sg;
- }
- aead_request_set_tfm(subreq, tctx->u.aead);
- aead_request_set_ad(subreq, req->assoclen);
- aead_request_set_callback(subreq, aead_request_flags(req),
- essiv_aead_done, req);
- aead_request_set_crypt(subreq, src, req->dst, req->cryptlen, req->iv);
- err = enc ? crypto_aead_encrypt(subreq) :
- crypto_aead_decrypt(subreq);
- if (rctx->assoc && err != -EINPROGRESS && err != -EBUSY)
- kfree(rctx->assoc);
- return err;
- }
- static int essiv_aead_encrypt(struct aead_request *req)
- {
- return essiv_aead_crypt(req, true);
- }
- static int essiv_aead_decrypt(struct aead_request *req)
- {
- return essiv_aead_crypt(req, false);
- }
- 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_alloc_cipher(ictx->essiv_cipher_name, 0, 0);
- if (IS_ERR(essiv_cipher))
- return PTR_ERR(essiv_cipher);
- hash = crypto_alloc_shash(ictx->shash_driver_name, 0, 0);
- 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 *skcipher;
- int err;
- skcipher = crypto_spawn_skcipher(&ictx->u.skcipher_spawn);
- if (IS_ERR(skcipher))
- return PTR_ERR(skcipher);
- crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
- crypto_skcipher_reqsize(skcipher));
- err = essiv_init_tfm(ictx, tctx);
- if (err) {
- crypto_free_skcipher(skcipher);
- return err;
- }
- tctx->u.skcipher = skcipher;
- return 0;
- }
- 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 = sizeof_field(struct essiv_aead_request_ctx, aead_req) +
- crypto_aead_reqsize(aead);
- tctx->ivoffset = offsetof(struct essiv_aead_request_ctx, aead_req) +
- subreq_size;
- crypto_aead_set_reqsize(tfm, tctx->ivoffset + crypto_aead_ivsize(aead));
- err = essiv_init_tfm(ictx, tctx);
- if (err) {
- crypto_free_aead(aead);
- return err;
- }
- tctx->u.aead = aead;
- return 0;
- }
- static void essiv_skcipher_exit_tfm(struct crypto_skcipher *tfm)
- {
- struct essiv_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
- crypto_free_skcipher(tctx->u.skcipher);
- 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.skcipher_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);
- kfree(inst);
- }
- static bool parse_cipher_name(char *essiv_cipher_name, const char *cra_name)
- {
- const char *p, *q;
- int len;
- /* find the last opening parens */
- p = strrchr(cra_name, '(');
- if (!p++)
- return false;
- /* find the first closing parens in the tail of the string */
- q = strchr(p, ')');
- if (!q)
- return false;
- len = q - p;
- if (len >= CRYPTO_MAX_ALG_NAME)
- return false;
- memcpy(essiv_cipher_name, p, len);
- essiv_cipher_name[len] = '\0';
- return true;
- }
- static bool essiv_supported_algorithms(const char *essiv_cipher_name,
- struct shash_alg *hash_alg,
- int ivsize)
- {
- struct crypto_alg *alg;
- bool ret = false;
- alg = crypto_alg_mod_lookup(essiv_cipher_name,
- CRYPTO_ALG_TYPE_CIPHER,
- CRYPTO_ALG_TYPE_MASK);
- if (IS_ERR(alg))
- return false;
- if (hash_alg->digestsize < alg->cra_cipher.cia_min_keysize ||
- hash_alg->digestsize > alg->cra_cipher.cia_max_keysize)
- goto out;
- if (ivsize != alg->cra_blocksize)
- goto out;
- if (crypto_shash_alg_needs_key(hash_alg))
- goto out;
- ret = true;
- out:
- crypto_mod_put(alg);
- return ret;
- }
- static int essiv_create(struct crypto_template *tmpl, struct rtattr **tb)
- {
- struct crypto_attr_type *algt;
- const char *inner_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 *skcipher_alg = NULL;
- struct aead_alg *aead_alg = NULL;
- struct crypto_alg *_hash_alg;
- struct shash_alg *hash_alg;
- int ivsize;
- u32 type;
- u32 mask;
- int err;
- algt = crypto_get_attr_type(tb);
- if (IS_ERR(algt))
- return PTR_ERR(algt);
- inner_cipher_name = crypto_attr_alg_name(tb[1]);
- if (IS_ERR(inner_cipher_name))
- return PTR_ERR(inner_cipher_name);
- shash_name = crypto_attr_alg_name(tb[2]);
- if (IS_ERR(shash_name))
- return PTR_ERR(shash_name);
- type = algt->type & algt->mask;
- mask = crypto_algt_inherited_mask(algt);
- switch (type) {
- case CRYPTO_ALG_TYPE_SKCIPHER:
- 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);
- /* 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);
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