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dm crypt: support using encrypted keys

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Allow one to use "encrypted" in addition to "user" and "logon" key
types for device encryption.

Signed-off-by: Dmitry Baryshkov <dmitry_baryshkov@mentor.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Dmitry Baryshkov 2020-04-20 16:46:59 +03:00 committed by Mike Snitzer
parent 2ef96a5bb1
commit 27f5411a71
2 changed files with 58 additions and 19 deletions
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1
drivers/md/Kconfig
View File

@ -269,6 +269,7 @@ config DM_UNSTRIPED
config DM_CRYPT
tristate "Crypt target support"
depends on BLK_DEV_DM
depends on (ENCRYPTED_KEYS || ENCRYPTED_KEYS=n)
select CRYPTO
select CRYPTO_CBC
select CRYPTO_ESSIV

76
drivers/md/dm-crypt.c
View File

@ -34,7 +34,9 @@
#include <crypto/aead.h>
#include <crypto/authenc.h>
#include <linux/rtnetlink.h> /* for struct rtattr and RTA macros only */
#include <linux/key-type.h>
#include <keys/user-type.h>
#include <keys/encrypted-type.h>
#include <linux/device-mapper.h>
@ -2215,12 +2217,47 @@ static bool contains_whitespace(const char *str)
return false;
}
static int set_key_user(struct crypt_config *cc, struct key *key)
{
const struct user_key_payload *ukp;
ukp = user_key_payload_locked(key);
if (!ukp)
return -EKEYREVOKED;
if (cc->key_size != ukp->datalen)
return -EINVAL;
memcpy(cc->key, ukp->data, cc->key_size);
return 0;
}
#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
static int set_key_encrypted(struct crypt_config *cc, struct key *key)
{
const struct encrypted_key_payload *ekp;
ekp = key->payload.data[0];
if (!ekp)
return -EKEYREVOKED;
if (cc->key_size != ekp->decrypted_datalen)
return -EINVAL;
memcpy(cc->key, ekp->decrypted_data, cc->key_size);
return 0;
}
#endif /* CONFIG_ENCRYPTED_KEYS */
static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
{
char *new_key_string, *key_desc;
int ret;
struct key_type *type;
struct key *key;
const struct user_key_payload *ukp;
int (*set_key)(struct crypt_config *cc, struct key *key);
/*
* Reject key_string with whitespace. dm core currently lacks code for
@ -2236,16 +2273,26 @@ static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string
if (!key_desc || key_desc == key_string || !strlen(key_desc + 1))
return -EINVAL;
if (strncmp(key_string, "logon:", key_desc - key_string + 1) &&
strncmp(key_string, "user:", key_desc - key_string + 1))
if (!strncmp(key_string, "logon:", key_desc - key_string + 1)) {
type = &key_type_logon;
set_key = set_key_user;
} else if (!strncmp(key_string, "user:", key_desc - key_string + 1)) {
type = &key_type_user;
set_key = set_key_user;
#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
} else if (!strncmp(key_string, "encrypted:", key_desc - key_string + 1)) {
type = &key_type_encrypted;
set_key = set_key_encrypted;
#endif
} else {
return -EINVAL;
}
new_key_string = kstrdup(key_string, GFP_KERNEL);
if (!new_key_string)
return -ENOMEM;
key = request_key(key_string[0] == 'l' ? &key_type_logon : &key_type_user,
key_desc + 1, NULL);
key = request_key(type, key_desc + 1, NULL);
if (IS_ERR(key)) {
kzfree(new_key_string);
return PTR_ERR(key);
@ -2253,23 +2300,14 @@ static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string
down_read(&key->sem);
ukp = user_key_payload_locked(key);
if (!ukp) {
ret = set_key(cc, key);
if (ret < 0) {
up_read(&key->sem);
key_put(key);
kzfree(new_key_string);
return -EKEYREVOKED;
return ret;
}
if (cc->key_size != ukp->datalen) {
up_read(&key->sem);
key_put(key);
kzfree(new_key_string);
return -EINVAL;
}
memcpy(cc->key, ukp->data, cc->key_size);
up_read(&key->sem);
key_put(key);
@ -2323,7 +2361,7 @@ static int get_key_size(char **key_string)
return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1;
}
#endif
#endif /* CONFIG_KEYS */
static int crypt_set_key(struct crypt_config *cc, char *key)
{
@ -3282,7 +3320,7 @@ static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits)
static struct target_type crypt_target = {
.name = "crypt",
.version = {1, 20, 0},
.version = {1, 21, 0},
.module = THIS_MODULE,
.ctr = crypt_ctr,
.dtr = crypt_dtr,