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Subject[RFC PATCH v1 2/4] dm: crypt: use new key_extract_material helper
Date
There is a common function now to extract key material out of a few
different key types, which includes all types currently supported by
dm-crypt. Make use of it.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
To: David Howells <dhowells@redhat.com>
To: Jarkko Sakkinen <jarkko@kernel.org>
To: James Morris <jmorris@namei.org>
To: "Serge E. Hallyn" <serge@hallyn.com>
To: Alasdair Kergon <agk@redhat.com>
To: Mike Snitzer <snitzer@redhat.com>
To: dm-devel@redhat.com
To: Song Liu <song@kernel.org>
To: Richard Weinberger <richard@nod.at>
Cc: linux-kernel@vger.kernel.org
Cc: linux-raid@vger.kernel.org
Cc: keyrings@vger.kernel.org
Cc: linux-mtd@lists.infradead.org
Cc: linux-security-module@vger.kernel.org
Cc: linux-integrity@vger.kernel.org
---
drivers/md/dm-crypt.c | 65 ++++++--------------------------------------
1 file changed, 9 insertions(+), 56 deletions(-)

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 50f4cbd600d5..576d6b7ce231 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -2421,61 +2421,14 @@ 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;
-}
-
-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;
-}
-
-static int set_key_trusted(struct crypt_config *cc, struct key *key)
-{
- const struct trusted_key_payload *tkp;
-
- tkp = key->payload.data[0];
- if (!tkp)
- return -EKEYREVOKED;
-
- if (cc->key_size != tkp->key_len)
- return -EINVAL;
-
- memcpy(cc->key, tkp->key, cc->key_size);
-
- return 0;
-}
-
static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
{
char *new_key_string, *key_desc;
int ret;
+ unsigned int len;
struct key_type *type;
struct key *key;
- int (*set_key)(struct crypt_config *cc, struct key *key);
+ const void *key_material;

/*
* Reject key_string with whitespace. dm core currently lacks code for
@@ -2493,18 +2446,14 @@ static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string

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;
} else if (IS_ENABLED(CONFIG_ENCRYPTED_KEYS) &&
!strncmp(key_string, "encrypted:", key_desc - key_string + 1)) {
type = &key_type_encrypted;
- set_key = set_key_encrypted;
} else if (IS_ENABLED(CONFIG_TRUSTED_KEYS) &&
!strncmp(key_string, "trusted:", key_desc - key_string + 1)) {
type = &key_type_trusted;
- set_key = set_key_trusted;
} else {
return -EINVAL;
}
@@ -2521,14 +2470,18 @@ static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string

down_read(&key->sem);

- ret = set_key(cc, key);
- if (ret < 0) {
+ key_material = key_extract_material(key, &len);
+ if (!IS_ERR(key_material) && len != cc->key_size)
+ key_material = ERR_PTR(-EINVAL);
+ if (IS_ERR(key_material)) {
up_read(&key->sem);
key_put(key);
kfree_sensitive(new_key_string);
- return ret;
+ return PTR_ERR(key_material);
}

+ memcpy(cc->key, key_material, len);
+
up_read(&key->sem);
key_put(key);

--
git-series 0.9.1
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