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dm crypt: support using encrypted keys
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:
parent
2ef96a5bb1
commit
27f5411a71
2 changed files with 58 additions and 19 deletions
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@ -269,6 +269,7 @@ config DM_UNSTRIPED
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config DM_CRYPT
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config DM_CRYPT
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tristate "Crypt target support"
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tristate "Crypt target support"
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depends on BLK_DEV_DM
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depends on BLK_DEV_DM
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depends on (ENCRYPTED_KEYS || ENCRYPTED_KEYS=n)
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select CRYPTO
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select CRYPTO
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select CRYPTO_CBC
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select CRYPTO_CBC
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select CRYPTO_ESSIV
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select CRYPTO_ESSIV
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@ -34,7 +34,9 @@
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#include <crypto/aead.h>
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#include <crypto/aead.h>
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#include <crypto/authenc.h>
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#include <crypto/authenc.h>
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#include <linux/rtnetlink.h> /* for struct rtattr and RTA macros only */
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#include <linux/rtnetlink.h> /* for struct rtattr and RTA macros only */
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#include <linux/key-type.h>
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#include <keys/user-type.h>
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#include <keys/user-type.h>
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#include <keys/encrypted-type.h>
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#include <linux/device-mapper.h>
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#include <linux/device-mapper.h>
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@ -2215,12 +2217,47 @@ static bool contains_whitespace(const char *str)
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return false;
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return false;
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}
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}
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static int set_key_user(struct crypt_config *cc, struct key *key)
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{
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const struct user_key_payload *ukp;
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ukp = user_key_payload_locked(key);
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if (!ukp)
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return -EKEYREVOKED;
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if (cc->key_size != ukp->datalen)
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return -EINVAL;
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memcpy(cc->key, ukp->data, cc->key_size);
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return 0;
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}
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#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
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static int set_key_encrypted(struct crypt_config *cc, struct key *key)
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{
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const struct encrypted_key_payload *ekp;
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ekp = key->payload.data[0];
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if (!ekp)
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return -EKEYREVOKED;
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if (cc->key_size != ekp->decrypted_datalen)
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return -EINVAL;
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memcpy(cc->key, ekp->decrypted_data, cc->key_size);
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return 0;
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}
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#endif /* CONFIG_ENCRYPTED_KEYS */
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static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
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static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
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{
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{
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char *new_key_string, *key_desc;
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char *new_key_string, *key_desc;
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int ret;
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int ret;
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struct key_type *type;
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struct key *key;
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struct key *key;
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const struct user_key_payload *ukp;
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int (*set_key)(struct crypt_config *cc, struct key *key);
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/*
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/*
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* Reject key_string with whitespace. dm core currently lacks code for
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* Reject key_string with whitespace. dm core currently lacks code for
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@ -2236,16 +2273,26 @@ static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string
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if (!key_desc || key_desc == key_string || !strlen(key_desc + 1))
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if (!key_desc || key_desc == key_string || !strlen(key_desc + 1))
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return -EINVAL;
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return -EINVAL;
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if (strncmp(key_string, "logon:", key_desc - key_string + 1) &&
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if (!strncmp(key_string, "logon:", key_desc - key_string + 1)) {
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strncmp(key_string, "user:", key_desc - key_string + 1))
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type = &key_type_logon;
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set_key = set_key_user;
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} else if (!strncmp(key_string, "user:", key_desc - key_string + 1)) {
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type = &key_type_user;
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set_key = set_key_user;
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#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
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} else if (!strncmp(key_string, "encrypted:", key_desc - key_string + 1)) {
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type = &key_type_encrypted;
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set_key = set_key_encrypted;
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#endif
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} else {
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return -EINVAL;
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return -EINVAL;
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}
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new_key_string = kstrdup(key_string, GFP_KERNEL);
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new_key_string = kstrdup(key_string, GFP_KERNEL);
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if (!new_key_string)
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if (!new_key_string)
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return -ENOMEM;
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return -ENOMEM;
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key = request_key(key_string[0] == 'l' ? &key_type_logon : &key_type_user,
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key = request_key(type, key_desc + 1, NULL);
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key_desc + 1, NULL);
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if (IS_ERR(key)) {
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if (IS_ERR(key)) {
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kzfree(new_key_string);
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kzfree(new_key_string);
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return PTR_ERR(key);
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return PTR_ERR(key);
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@ -2253,23 +2300,14 @@ static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string
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down_read(&key->sem);
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down_read(&key->sem);
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ukp = user_key_payload_locked(key);
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ret = set_key(cc, key);
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if (!ukp) {
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if (ret < 0) {
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up_read(&key->sem);
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up_read(&key->sem);
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key_put(key);
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key_put(key);
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kzfree(new_key_string);
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kzfree(new_key_string);
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return -EKEYREVOKED;
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return ret;
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}
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}
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if (cc->key_size != ukp->datalen) {
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up_read(&key->sem);
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key_put(key);
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kzfree(new_key_string);
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return -EINVAL;
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}
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memcpy(cc->key, ukp->data, cc->key_size);
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up_read(&key->sem);
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up_read(&key->sem);
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key_put(key);
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key_put(key);
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@ -2323,7 +2361,7 @@ static int get_key_size(char **key_string)
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return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1;
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return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1;
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}
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}
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#endif
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#endif /* CONFIG_KEYS */
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static int crypt_set_key(struct crypt_config *cc, char *key)
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static int crypt_set_key(struct crypt_config *cc, char *key)
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{
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{
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@ -3282,7 +3320,7 @@ static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits)
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static struct target_type crypt_target = {
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static struct target_type crypt_target = {
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.name = "crypt",
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.name = "crypt",
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.version = {1, 20, 0},
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.version = {1, 21, 0},
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.module = THIS_MODULE,
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.module = THIS_MODULE,
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.ctr = crypt_ctr,
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.ctr = crypt_ctr,
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.dtr = crypt_dtr,
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.dtr = crypt_dtr,
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