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s390/crypto: enable clear key values for paes ciphers

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With this patch the paes ciphers do accept AES clear key values of
size 16, 24 or 32 byte. The key value is internal rearranged to form a
paes clear key token so that the pkey kernel module recognizes and
handles this key material as source for protected keys.

Using clear key material as a source for protected keys is a security
risc as the raw key material is kept in memory. However, so the AES
selftests provided with the testmanager can be run during registration
of the paes ciphers.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Harald Freudenberger 2020-01-22 12:24:00 +01:00 committed by Vasily Gorbik
parent 888edbc488
commit 7f820d0539
1 changed files with 48 additions and 21 deletions
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69
arch/s390/crypto/paes_s390.c
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@ -33,7 +33,7 @@
* is called. As paes can handle different kinds of key blobs
* and padding is also possible, the limits need to be generous.
*/
#define PAES_MIN_KEYSIZE 64
#define PAES_MIN_KEYSIZE 16
#define PAES_MAX_KEYSIZE 256
static u8 *ctrblk;
@ -54,19 +54,46 @@ struct key_blob {
unsigned int keylen;
};
static inline int _copy_key_to_kb(struct key_blob *kb,
const u8 *key,
unsigned int keylen)
static inline int _key_to_kb(struct key_blob *kb,
const u8 *key,
unsigned int keylen)
{
if (keylen <= sizeof(kb->keybuf))
struct clearkey_header {
u8 type;
u8 res0[3];
u8 version;
u8 res1[3];
u32 keytype;
u32 len;
} __packed * h;
switch (keylen) {
case 16:
case 24:
case 32:
/* clear key value, prepare pkey clear key token in keybuf */
memset(kb->keybuf, 0, sizeof(kb->keybuf));
h = (struct clearkey_header *) kb->keybuf;
h->version = 0x02; /* TOKVER_CLEAR_KEY */
h->keytype = (keylen - 8) >> 3;
h->len = keylen;
memcpy(kb->keybuf + sizeof(*h), key, keylen);
kb->keylen = sizeof(*h) + keylen;
kb->key = kb->keybuf;
else {
kb->key = kmalloc(keylen, GFP_KERNEL);
if (!kb->key)
return -ENOMEM;
break;
default:
/* other key material, let pkey handle this */
if (keylen <= sizeof(kb->keybuf))
kb->key = kb->keybuf;
else {
kb->key = kmalloc(keylen, GFP_KERNEL);
if (!kb->key)
return -ENOMEM;
}
memcpy(kb->key, key, keylen);
kb->keylen = keylen;
break;
}
memcpy(kb->key, key, keylen);
kb->keylen = keylen;
return 0;
}
@ -165,7 +192,7 @@ static int ecb_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
_free_kb_keybuf(&ctx->kb);
rc = _copy_key_to_kb(&ctx->kb, in_key, key_len);
rc = _key_to_kb(&ctx->kb, in_key, key_len);
if (rc)
return rc;
@ -278,7 +305,7 @@ static int cbc_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
_free_kb_keybuf(&ctx->kb);
rc = _copy_key_to_kb(&ctx->kb, in_key, key_len);
rc = _key_to_kb(&ctx->kb, in_key, key_len);
if (rc)
return rc;
@ -425,10 +452,10 @@ static int xts_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
_free_kb_keybuf(&ctx->kb[0]);
_free_kb_keybuf(&ctx->kb[1]);
rc = _copy_key_to_kb(&ctx->kb[0], in_key, key_len);
rc = _key_to_kb(&ctx->kb[0], in_key, key_len);
if (rc)
return rc;
rc = _copy_key_to_kb(&ctx->kb[1], in_key + key_len, key_len);
rc = _key_to_kb(&ctx->kb[1], in_key + key_len, key_len);
if (rc)
return rc;
@ -574,7 +601,7 @@ static int ctr_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
_free_kb_keybuf(&ctx->kb);
rc = _copy_key_to_kb(&ctx->kb, in_key, key_len);
rc = _key_to_kb(&ctx->kb, in_key, key_len);
if (rc)
return rc;
@ -695,12 +722,12 @@ static inline void __crypto_unregister_skcipher(struct skcipher_alg *alg)
static void paes_s390_fini(void)
{
if (ctrblk)
free_page((unsigned long) ctrblk);
__crypto_unregister_skcipher(&ctr_paes_alg);
__crypto_unregister_skcipher(&xts_paes_alg);
__crypto_unregister_skcipher(&cbc_paes_alg);
__crypto_unregister_skcipher(&ecb_paes_alg);
if (ctrblk)
free_page((unsigned long) ctrblk);
}
static int __init paes_s390_init(void)
@ -738,14 +765,14 @@ static int __init paes_s390_init(void)
if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_128) ||
cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_192) ||
cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_256)) {
ret = crypto_register_skcipher(&ctr_paes_alg);
if (ret)
goto out_err;
ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
if (!ctrblk) {
ret = -ENOMEM;
goto out_err;
}
ret = crypto_register_skcipher(&ctr_paes_alg);
if (ret)
goto out_err;
}
return 0;