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fscrypt: invoke crypto API for ESSIV handling 

Instead of open-coding the calculations for ESSIV handling, use an ESSIV
skcipher which does all of this under the hood.  ESSIV was added to the
crypto API in v5.4.

This is based on a patch from Ard Biesheuvel, but reworked to apply
after all the fscrypt changes that went into v5.4.

Tested with 'kvm-xfstests -c ext4,f2fs -g encrypt', including the
ciphertext verification tests for v1 and v2 encryption policies.

Originally-from: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Eric Biggers 2019-10-09 16:34:16 -07:00
parent 7d194c2100
commit 4006d799d9
5 changed files with 14 additions and 116 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
Documentation/filesystems/fscrypt.rst
View File

@ -308,8 +308,9 @@ If unsure, you should use the (AES-256-XTS, AES-256-CTS-CBC) pair.
AES-128-CBC was added only for low-powered embedded devices with
crypto accelerators such as CAAM or CESA that do not support XTS. To
use AES-128-CBC, CONFIG_CRYPTO_SHA256 (or another SHA-256
implementation) must be enabled so that ESSIV can be used.
use AES-128-CBC, CONFIG_CRYPTO_ESSIV and CONFIG_CRYPTO_SHA256 (or
another SHA-256 implementation) must be enabled so that ESSIV can be
used.
Adiantum is a (primarily) stream cipher-based mode that is fast even
on CPUs without dedicated crypto instructions. It's also a true

4
fs/crypto/crypto.c
View File

@ -27,7 +27,6 @@
#include <linux/ratelimit.h>
#include <linux/dcache.h>
#include <linux/namei.h>
#include <crypto/aes.h>
#include <crypto/skcipher.h>
#include "fscrypt_private.h"
@ -143,9 +142,6 @@ void fscrypt_generate_iv(union fscrypt_iv *iv, u64 lblk_num,
if (fscrypt_is_direct_key_policy(&ci->ci_policy))
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);
}
/* Encrypt or decrypt a single filesystem block of file contents */

7
fs/crypto/fscrypt_private.h
View File

@ -163,12 +163,6 @@ 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 the
* contents or filenames encryption mode, depending on the inode type.
@ -444,7 +438,6 @@ struct fscrypt_mode {
int keysize;
int ivsize;
bool logged_impl_name;
bool needs_essiv;
};
static inline bool

110
fs/crypto/keysetup.c
View File

@ -8,15 +8,11 @@
* Heavily modified since then.
*/
#include <crypto/aes.h>
#include <crypto/sha.h>
#include <crypto/skcipher.h>
#include <linux/key.h>
#include "fscrypt_private.h"
static struct crypto_shash *essiv_hash_tfm;
static struct fscrypt_mode available_modes[] = {
[FSCRYPT_MODE_AES_256_XTS] = {
.friendly_name = "AES-256-XTS",
@ -31,11 +27,10 @@ static struct fscrypt_mode available_modes[] = {
.ivsize = 16,
},
[FSCRYPT_MODE_AES_128_CBC] = {
.friendly_name = "AES-128-CBC",
.cipher_str = "cbc(aes)",
.friendly_name = "AES-128-CBC-ESSIV",
.cipher_str = "essiv(cbc(aes),sha256)",
.keysize = 16,
.ivsize = 16,
.needs_essiv = true,
},
[FSCRYPT_MODE_AES_128_CTS] = {
.friendly_name = "AES-128-CTS-CBC",
@ -111,97 +106,16 @@ err_free_tfm:
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)) {
if (PTR_ERR(tfm) == -ENOENT) {
fscrypt_warn(NULL,
"Missing crypto API support for SHA-256");
return -ENOPKG;
}
fscrypt_err(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];
if (WARN_ON(ci->ci_mode->ivsize != AES_BLOCK_SIZE))
return -EINVAL;
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;
}
/* Given the per-file key, set up the file's crypto transform object(s) */
/* Given the per-file key, set up the file's crypto transform object */
int fscrypt_set_derived_key(struct fscrypt_info *ci, const u8 *derived_key)
{
struct fscrypt_mode *mode = ci->ci_mode;
struct crypto_skcipher *ctfm;
int err;
struct crypto_skcipher *tfm;
ctfm = fscrypt_allocate_skcipher(mode, derived_key, ci->ci_inode);
if (IS_ERR(ctfm))
return PTR_ERR(ctfm);
tfm = fscrypt_allocate_skcipher(ci->ci_mode, derived_key, ci->ci_inode);
if (IS_ERR(tfm))
return PTR_ERR(tfm);
ci->ci_ctfm = ctfm;
if (mode->needs_essiv) {
err = init_essiv_generator(ci, derived_key, mode->keysize);
if (err) {
fscrypt_warn(ci->ci_inode,
"Error initializing ESSIV generator: %d",
err);
return err;
}
}
ci->ci_ctfm = tfm;
return 0;
}
@ -388,13 +302,11 @@ static void put_crypt_info(struct fscrypt_info *ci)
if (!ci)
return;
if (ci->ci_direct_key) {
if (ci->ci_direct_key)
fscrypt_put_direct_key(ci->ci_direct_key);
} else if ((ci->ci_ctfm != NULL || ci->ci_essiv_tfm != NULL) &&
!fscrypt_is_direct_key_policy(&ci->ci_policy)) {
else if (ci->ci_ctfm != NULL &&
!fscrypt_is_direct_key_policy(&ci->ci_policy))
crypto_free_skcipher(ci->ci_ctfm);
crypto_free_cipher(ci->ci_essiv_tfm);
}
key = ci->ci_master_key;
if (key) {

4
fs/crypto/keysetup_v1.c
View File

@ -270,10 +270,6 @@ static int setup_v1_file_key_direct(struct fscrypt_info *ci,
return -EINVAL;
}
/* ESSIV implies 16-byte IVs which implies !DIRECT_KEY */
if (WARN_ON(mode->needs_essiv))
return -EINVAL;
dk = fscrypt_get_direct_key(ci, raw_master_key);
if (IS_ERR(dk))
return PTR_ERR(dk);