eCryptfs: Use skcipher and shash
This patch replaces uses of ablkcipher and blkcipher with skcipher, and the long obsolete hash interface with shash. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
parent
cf80e0e47e
commit
3095e8e366
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@ -23,6 +23,8 @@
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* 02111-1307, USA.
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*/
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#include <crypto/hash.h>
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#include <crypto/skcipher.h>
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/pagemap.h>
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@ -30,7 +32,6 @@
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#include <linux/compiler.h>
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#include <linux/key.h>
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#include <linux/namei.h>
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#include <linux/crypto.h>
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#include <linux/file.h>
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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@ -74,6 +75,19 @@ void ecryptfs_from_hex(char *dst, char *src, int dst_size)
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}
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}
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static int ecryptfs_hash_digest(struct crypto_shash *tfm,
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char *src, int len, char *dst)
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{
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SHASH_DESC_ON_STACK(desc, tfm);
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int err;
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desc->tfm = tfm;
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desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
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err = crypto_shash_digest(desc, src, len, dst);
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shash_desc_zero(desc);
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return err;
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}
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/**
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* ecryptfs_calculate_md5 - calculates the md5 of @src
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* @dst: Pointer to 16 bytes of allocated memory
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@ -88,45 +102,26 @@ static int ecryptfs_calculate_md5(char *dst,
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struct ecryptfs_crypt_stat *crypt_stat,
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char *src, int len)
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{
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struct scatterlist sg;
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struct hash_desc desc = {
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.tfm = crypt_stat->hash_tfm,
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.flags = CRYPTO_TFM_REQ_MAY_SLEEP
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};
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struct crypto_shash *tfm;
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int rc = 0;
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mutex_lock(&crypt_stat->cs_hash_tfm_mutex);
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sg_init_one(&sg, (u8 *)src, len);
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if (!desc.tfm) {
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desc.tfm = crypto_alloc_hash(ECRYPTFS_DEFAULT_HASH, 0,
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CRYPTO_ALG_ASYNC);
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if (IS_ERR(desc.tfm)) {
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rc = PTR_ERR(desc.tfm);
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tfm = crypt_stat->hash_tfm;
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if (!tfm) {
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tfm = crypto_alloc_shash(ECRYPTFS_DEFAULT_HASH, 0, 0);
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if (IS_ERR(tfm)) {
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rc = PTR_ERR(tfm);
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ecryptfs_printk(KERN_ERR, "Error attempting to "
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"allocate crypto context; rc = [%d]\n",
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rc);
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goto out;
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}
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crypt_stat->hash_tfm = desc.tfm;
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crypt_stat->hash_tfm = tfm;
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}
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rc = crypto_hash_init(&desc);
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rc = ecryptfs_hash_digest(tfm, src, len, dst);
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if (rc) {
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printk(KERN_ERR
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"%s: Error initializing crypto hash; rc = [%d]\n",
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__func__, rc);
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goto out;
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}
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rc = crypto_hash_update(&desc, &sg, len);
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if (rc) {
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printk(KERN_ERR
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"%s: Error updating crypto hash; rc = [%d]\n",
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__func__, rc);
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goto out;
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}
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rc = crypto_hash_final(&desc, dst);
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if (rc) {
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printk(KERN_ERR
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"%s: Error finalizing crypto hash; rc = [%d]\n",
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"%s: Error computing crypto hash; rc = [%d]\n",
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__func__, rc);
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goto out;
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}
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@ -234,10 +229,8 @@ void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat)
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{
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struct ecryptfs_key_sig *key_sig, *key_sig_tmp;
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if (crypt_stat->tfm)
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crypto_free_ablkcipher(crypt_stat->tfm);
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if (crypt_stat->hash_tfm)
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crypto_free_hash(crypt_stat->hash_tfm);
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crypto_free_skcipher(crypt_stat->tfm);
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crypto_free_shash(crypt_stat->hash_tfm);
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list_for_each_entry_safe(key_sig, key_sig_tmp,
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&crypt_stat->keysig_list, crypt_stat_list) {
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list_del(&key_sig->crypt_stat_list);
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@ -342,7 +335,7 @@ static int crypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
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struct scatterlist *src_sg, int size,
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unsigned char *iv, int op)
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{
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struct ablkcipher_request *req = NULL;
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struct skcipher_request *req = NULL;
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struct extent_crypt_result ecr;
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int rc = 0;
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@ -358,19 +351,19 @@ static int crypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
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init_completion(&ecr.completion);
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mutex_lock(&crypt_stat->cs_tfm_mutex);
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req = ablkcipher_request_alloc(crypt_stat->tfm, GFP_NOFS);
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req = skcipher_request_alloc(crypt_stat->tfm, GFP_NOFS);
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if (!req) {
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mutex_unlock(&crypt_stat->cs_tfm_mutex);
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rc = -ENOMEM;
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goto out;
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}
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ablkcipher_request_set_callback(req,
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skcipher_request_set_callback(req,
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CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
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extent_crypt_complete, &ecr);
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/* Consider doing this once, when the file is opened */
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if (!(crypt_stat->flags & ECRYPTFS_KEY_SET)) {
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rc = crypto_ablkcipher_setkey(crypt_stat->tfm, crypt_stat->key,
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rc = crypto_skcipher_setkey(crypt_stat->tfm, crypt_stat->key,
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crypt_stat->key_size);
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if (rc) {
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ecryptfs_printk(KERN_ERR,
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@ -383,9 +376,9 @@ static int crypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
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crypt_stat->flags |= ECRYPTFS_KEY_SET;
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}
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mutex_unlock(&crypt_stat->cs_tfm_mutex);
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ablkcipher_request_set_crypt(req, src_sg, dst_sg, size, iv);
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rc = op == ENCRYPT ? crypto_ablkcipher_encrypt(req) :
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crypto_ablkcipher_decrypt(req);
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skcipher_request_set_crypt(req, src_sg, dst_sg, size, iv);
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rc = op == ENCRYPT ? crypto_skcipher_encrypt(req) :
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crypto_skcipher_decrypt(req);
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if (rc == -EINPROGRESS || rc == -EBUSY) {
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struct extent_crypt_result *ecr = req->base.data;
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reinit_completion(&ecr->completion);
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}
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out:
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ablkcipher_request_free(req);
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skcipher_request_free(req);
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return rc;
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}
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@ -622,7 +615,7 @@ int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat)
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crypt_stat->cipher, "cbc");
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if (rc)
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goto out_unlock;
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crypt_stat->tfm = crypto_alloc_ablkcipher(full_alg_name, 0, 0);
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crypt_stat->tfm = crypto_alloc_skcipher(full_alg_name, 0, 0);
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if (IS_ERR(crypt_stat->tfm)) {
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rc = PTR_ERR(crypt_stat->tfm);
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crypt_stat->tfm = NULL;
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full_alg_name);
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goto out_free;
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}
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crypto_ablkcipher_set_flags(crypt_stat->tfm, CRYPTO_TFM_REQ_WEAK_KEY);
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crypto_skcipher_set_flags(crypt_stat->tfm, CRYPTO_TFM_REQ_WEAK_KEY);
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rc = 0;
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out_free:
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kfree(full_alg_name);
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@ -1591,7 +1584,7 @@ out:
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* event, regardless of whether this function succeeds for fails.
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*/
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static int
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ecryptfs_process_key_cipher(struct crypto_blkcipher **key_tfm,
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ecryptfs_process_key_cipher(struct crypto_skcipher **key_tfm,
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char *cipher_name, size_t *key_size)
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{
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char dummy_key[ECRYPTFS_MAX_KEY_BYTES];
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"ecb");
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if (rc)
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goto out;
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*key_tfm = crypto_alloc_blkcipher(full_alg_name, 0, CRYPTO_ALG_ASYNC);
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*key_tfm = crypto_alloc_skcipher(full_alg_name, 0, CRYPTO_ALG_ASYNC);
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if (IS_ERR(*key_tfm)) {
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rc = PTR_ERR(*key_tfm);
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printk(KERN_ERR "Unable to allocate crypto cipher with name "
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"[%s]; rc = [%d]\n", full_alg_name, rc);
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goto out;
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}
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crypto_blkcipher_set_flags(*key_tfm, CRYPTO_TFM_REQ_WEAK_KEY);
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if (*key_size == 0) {
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struct blkcipher_alg *alg = crypto_blkcipher_alg(*key_tfm);
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*key_size = alg->max_keysize;
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}
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crypto_skcipher_set_flags(*key_tfm, CRYPTO_TFM_REQ_WEAK_KEY);
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if (*key_size == 0)
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*key_size = crypto_skcipher_default_keysize(*key_tfm);
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get_random_bytes(dummy_key, *key_size);
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rc = crypto_blkcipher_setkey(*key_tfm, dummy_key, *key_size);
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rc = crypto_skcipher_setkey(*key_tfm, dummy_key, *key_size);
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if (rc) {
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printk(KERN_ERR "Error attempting to set key of size [%zd] for "
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"cipher [%s]; rc = [%d]\n", *key_size, full_alg_name,
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list_for_each_entry_safe(key_tfm, key_tfm_tmp, &key_tfm_list,
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key_tfm_list) {
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list_del(&key_tfm->key_tfm_list);
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if (key_tfm->key_tfm)
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crypto_free_blkcipher(key_tfm->key_tfm);
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crypto_free_skcipher(key_tfm->key_tfm);
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kmem_cache_free(ecryptfs_key_tfm_cache, key_tfm);
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}
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mutex_unlock(&key_tfm_list_mutex);
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@ -1747,7 +1736,7 @@ int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm)
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* Searches for cached item first, and creates new if not found.
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* Returns 0 on success, non-zero if adding new cipher failed
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*/
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int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
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int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_skcipher **tfm,
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struct mutex **tfm_mutex,
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char *cipher_name)
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{
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int ecryptfs_set_f_namelen(long *namelen, long lower_namelen,
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struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
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{
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struct blkcipher_desc desc;
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struct crypto_skcipher *tfm;
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struct mutex *tfm_mutex;
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size_t cipher_blocksize;
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int rc;
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@ -2130,7 +2119,7 @@ int ecryptfs_set_f_namelen(long *namelen, long lower_namelen,
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return 0;
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}
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rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&desc.tfm, &tfm_mutex,
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rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&tfm, &tfm_mutex,
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mount_crypt_stat->global_default_fn_cipher_name);
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if (unlikely(rc)) {
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(*namelen) = 0;
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@ -2138,7 +2127,7 @@ int ecryptfs_set_f_namelen(long *namelen, long lower_namelen,
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}
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mutex_lock(tfm_mutex);
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cipher_blocksize = crypto_blkcipher_blocksize(desc.tfm);
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cipher_blocksize = crypto_skcipher_blocksize(tfm);
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mutex_unlock(tfm_mutex);
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/* Return an exact amount for the common cases */
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@ -28,6 +28,7 @@
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#ifndef ECRYPTFS_KERNEL_H
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#define ECRYPTFS_KERNEL_H
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#include <crypto/skcipher.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/fs.h>
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@ -38,7 +39,6 @@
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#include <linux/nsproxy.h>
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#include <linux/backing-dev.h>
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#include <linux/ecryptfs.h>
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#include <linux/crypto.h>
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#define ECRYPTFS_DEFAULT_IV_BYTES 16
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#define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
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@ -233,8 +233,8 @@ struct ecryptfs_crypt_stat {
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size_t extent_shift;
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unsigned int extent_mask;
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struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
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struct crypto_ablkcipher *tfm;
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struct crypto_hash *hash_tfm; /* Crypto context for generating
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struct crypto_skcipher *tfm;
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struct crypto_shash *hash_tfm; /* Crypto context for generating
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* the initialization vectors */
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unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
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unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
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@ -309,7 +309,7 @@ struct ecryptfs_global_auth_tok {
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* keeps a list of crypto API contexts around to use when needed.
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*/
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struct ecryptfs_key_tfm {
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struct crypto_blkcipher *key_tfm;
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struct crypto_skcipher *key_tfm;
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size_t key_size;
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struct mutex key_tfm_mutex;
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struct list_head key_tfm_list;
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@ -659,7 +659,7 @@ ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
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int ecryptfs_init_crypto(void);
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int ecryptfs_destroy_crypto(void);
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int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm);
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int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
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int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_skcipher **tfm,
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struct mutex **tfm_mutex,
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char *cipher_name);
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int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
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@ -29,7 +29,6 @@
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#include <linux/dcache.h>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/crypto.h>
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#include <linux/fs_stack.h>
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#include <linux/slab.h>
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#include <linux/xattr.h>
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@ -25,11 +25,12 @@
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* 02111-1307, USA.
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*/
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#include <crypto/hash.h>
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#include <crypto/skcipher.h>
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#include <linux/string.h>
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#include <linux/pagemap.h>
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#include <linux/key.h>
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#include <linux/random.h>
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#include <linux/crypto.h>
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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#include "ecryptfs_kernel.h"
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@ -601,12 +602,13 @@ struct ecryptfs_write_tag_70_packet_silly_stack {
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struct ecryptfs_auth_tok *auth_tok;
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struct scatterlist src_sg[2];
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struct scatterlist dst_sg[2];
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struct blkcipher_desc desc;
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struct crypto_skcipher *skcipher_tfm;
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struct skcipher_request *skcipher_req;
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char iv[ECRYPTFS_MAX_IV_BYTES];
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char hash[ECRYPTFS_TAG_70_DIGEST_SIZE];
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char tmp_hash[ECRYPTFS_TAG_70_DIGEST_SIZE];
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struct hash_desc hash_desc;
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struct scatterlist hash_sg;
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struct crypto_shash *hash_tfm;
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struct shash_desc *hash_desc;
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};
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/**
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@ -629,14 +631,13 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
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struct key *auth_tok_key = NULL;
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int rc = 0;
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s = kmalloc(sizeof(*s), GFP_KERNEL);
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s = kzalloc(sizeof(*s), GFP_KERNEL);
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if (!s) {
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printk(KERN_ERR "%s: Out of memory whilst trying to kmalloc "
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"[%zd] bytes of kernel memory\n", __func__, sizeof(*s));
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rc = -ENOMEM;
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goto out;
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}
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s->desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
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(*packet_size) = 0;
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rc = ecryptfs_find_auth_tok_for_sig(
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&auth_tok_key,
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@ -649,7 +650,7 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
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goto out;
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}
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rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(
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&s->desc.tfm,
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&s->skcipher_tfm,
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&s->tfm_mutex, mount_crypt_stat->global_default_fn_cipher_name);
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if (unlikely(rc)) {
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printk(KERN_ERR "Internal error whilst attempting to get "
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@ -658,7 +659,7 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
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goto out;
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}
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mutex_lock(s->tfm_mutex);
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s->block_size = crypto_blkcipher_blocksize(s->desc.tfm);
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s->block_size = crypto_skcipher_blocksize(s->skcipher_tfm);
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/* Plus one for the \0 separator between the random prefix
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* and the plaintext filename */
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s->num_rand_bytes = (ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES + 1);
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|
@ -691,6 +692,19 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
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rc = -EINVAL;
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goto out_unlock;
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}
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s->skcipher_req = skcipher_request_alloc(s->skcipher_tfm, GFP_KERNEL);
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if (!s->skcipher_req) {
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printk(KERN_ERR "%s: Out of kernel memory whilst attempting to "
|
||||
"skcipher_request_alloc for %s\n", __func__,
|
||||
crypto_skcipher_driver_name(s->skcipher_tfm));
|
||||
rc = -ENOMEM;
|
||||
goto out_unlock;
|
||||
}
|
||||
|
||||
skcipher_request_set_callback(s->skcipher_req,
|
||||
CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL);
|
||||
|
||||
s->block_aligned_filename = kzalloc(s->block_aligned_filename_size,
|
||||
GFP_KERNEL);
|
||||
if (!s->block_aligned_filename) {
|
||||
|
@ -700,7 +714,6 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
|
|||
rc = -ENOMEM;
|
||||
goto out_unlock;
|
||||
}
|
||||
s->i = 0;
|
||||
dest[s->i++] = ECRYPTFS_TAG_70_PACKET_TYPE;
|
||||
rc = ecryptfs_write_packet_length(&dest[s->i],
|
||||
(ECRYPTFS_SIG_SIZE
|
||||
|
@ -738,40 +751,36 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
|
|||
"password tokens\n", __func__);
|
||||
goto out_free_unlock;
|
||||
}
|
||||
sg_init_one(
|
||||
&s->hash_sg,
|
||||
(u8 *)s->auth_tok->token.password.session_key_encryption_key,
|
||||
s->auth_tok->token.password.session_key_encryption_key_bytes);
|
||||
s->hash_desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
|
||||
s->hash_desc.tfm = crypto_alloc_hash(ECRYPTFS_TAG_70_DIGEST, 0,
|
||||
CRYPTO_ALG_ASYNC);
|
||||
if (IS_ERR(s->hash_desc.tfm)) {
|
||||
rc = PTR_ERR(s->hash_desc.tfm);
|
||||
s->hash_tfm = crypto_alloc_shash(ECRYPTFS_TAG_70_DIGEST, 0, 0);
|
||||
if (IS_ERR(s->hash_tfm)) {
|
||||
rc = PTR_ERR(s->hash_tfm);
|
||||
printk(KERN_ERR "%s: Error attempting to "
|
||||
"allocate hash crypto context; rc = [%d]\n",
|
||||
__func__, rc);
|
||||
goto out_free_unlock;
|
||||
}
|
||||
rc = crypto_hash_init(&s->hash_desc);
|
||||
if (rc) {
|
||||
printk(KERN_ERR
|
||||
"%s: Error initializing crypto hash; rc = [%d]\n",
|
||||
__func__, rc);
|
||||
|
||||
s->hash_desc = kmalloc(sizeof(*s->hash_desc) +
|
||||
crypto_shash_descsize(s->hash_tfm), GFP_KERNEL);
|
||||
if (!s->hash_desc) {
|
||||
printk(KERN_ERR "%s: Out of kernel memory whilst attempting to "
|
||||
"kmalloc [%zd] bytes\n", __func__,
|
||||
sizeof(*s->hash_desc) +
|
||||
crypto_shash_descsize(s->hash_tfm));
|
||||
rc = -ENOMEM;
|
||||
goto out_release_free_unlock;
|
||||
}
|
||||
rc = crypto_hash_update(
|
||||
&s->hash_desc, &s->hash_sg,
|
||||
s->auth_tok->token.password.session_key_encryption_key_bytes);
|
||||
|
||||
s->hash_desc->tfm = s->hash_tfm;
|
||||
s->hash_desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
|
||||
|
||||
rc = crypto_shash_digest(s->hash_desc,
|
||||
(u8 *)s->auth_tok->token.password.session_key_encryption_key,
|
||||
s->auth_tok->token.password.session_key_encryption_key_bytes,
|
||||
s->hash);
|
||||
if (rc) {
|
||||
printk(KERN_ERR
|
||||
"%s: Error updating crypto hash; rc = [%d]\n",
|
||||
__func__, rc);
|
||||
goto out_release_free_unlock;
|
||||
}
|
||||
rc = crypto_hash_final(&s->hash_desc, s->hash);
|
||||
if (rc) {
|
||||
printk(KERN_ERR
|
||||
"%s: Error finalizing crypto hash; rc = [%d]\n",
|
||||
"%s: Error computing crypto hash; rc = [%d]\n",
|
||||
__func__, rc);
|
||||
goto out_release_free_unlock;
|
||||
}
|
||||
|
@ -780,27 +789,12 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
|
|||
s->hash[(s->j % ECRYPTFS_TAG_70_DIGEST_SIZE)];
|
||||
if ((s->j % ECRYPTFS_TAG_70_DIGEST_SIZE)
|
||||
== (ECRYPTFS_TAG_70_DIGEST_SIZE - 1)) {
|
||||
sg_init_one(&s->hash_sg, (u8 *)s->hash,
|
||||
ECRYPTFS_TAG_70_DIGEST_SIZE);
|
||||
rc = crypto_hash_init(&s->hash_desc);
|
||||
rc = crypto_shash_digest(s->hash_desc, (u8 *)s->hash,
|
||||
ECRYPTFS_TAG_70_DIGEST_SIZE,
|
||||
s->tmp_hash);
|
||||
if (rc) {
|
||||
printk(KERN_ERR
|
||||
"%s: Error initializing crypto hash; "
|
||||
"rc = [%d]\n", __func__, rc);
|
||||
goto out_release_free_unlock;
|
||||
}
|
||||
rc = crypto_hash_update(&s->hash_desc, &s->hash_sg,
|
||||
ECRYPTFS_TAG_70_DIGEST_SIZE);
|
||||
if (rc) {
|
||||
printk(KERN_ERR
|
||||
"%s: Error updating crypto hash; "
|
||||
"rc = [%d]\n", __func__, rc);
|
||||
goto out_release_free_unlock;
|
||||
}
|
||||
rc = crypto_hash_final(&s->hash_desc, s->tmp_hash);
|
||||
if (rc) {
|
||||
printk(KERN_ERR
|
||||
"%s: Error finalizing crypto hash; "
|
||||
"%s: Error computing crypto hash; "
|
||||
"rc = [%d]\n", __func__, rc);
|
||||
goto out_release_free_unlock;
|
||||
}
|
||||
|
@ -834,10 +828,8 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
|
|||
* of the IV here, so we just use 0's for the IV. Note the
|
||||
* constraint that ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES
|
||||
* >= ECRYPTFS_MAX_IV_BYTES. */
|
||||
memset(s->iv, 0, ECRYPTFS_MAX_IV_BYTES);
|
||||
s->desc.info = s->iv;
|
||||
rc = crypto_blkcipher_setkey(
|
||||
s->desc.tfm,
|
||||
rc = crypto_skcipher_setkey(
|
||||
s->skcipher_tfm,
|
||||
s->auth_tok->token.password.session_key_encryption_key,
|
||||
mount_crypt_stat->global_default_fn_cipher_key_bytes);
|
||||
if (rc < 0) {
|
||||
|
@ -850,8 +842,9 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
|
|||
mount_crypt_stat->global_default_fn_cipher_key_bytes);
|
||||
goto out_release_free_unlock;
|
||||
}
|
||||
rc = crypto_blkcipher_encrypt_iv(&s->desc, s->dst_sg, s->src_sg,
|
||||
s->block_aligned_filename_size);
|
||||
skcipher_request_set_crypt(s->skcipher_req, s->src_sg, s->dst_sg,
|
||||
s->block_aligned_filename_size, s->iv);
|
||||
rc = crypto_skcipher_encrypt(s->skcipher_req);
|
||||
if (rc) {
|
||||
printk(KERN_ERR "%s: Error attempting to encrypt filename; "
|
||||
"rc = [%d]\n", __func__, rc);
|
||||
|
@ -861,7 +854,7 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
|
|||
(*packet_size) = s->i;
|
||||
(*remaining_bytes) -= (*packet_size);
|
||||
out_release_free_unlock:
|
||||
crypto_free_hash(s->hash_desc.tfm);
|
||||
crypto_free_shash(s->hash_tfm);
|
||||
out_free_unlock:
|
||||
kzfree(s->block_aligned_filename);
|
||||
out_unlock:
|
||||
|
@ -871,6 +864,8 @@ out:
|
|||
up_write(&(auth_tok_key->sem));
|
||||
key_put(auth_tok_key);
|
||||
}
|
||||
skcipher_request_free(s->skcipher_req);
|
||||
kzfree(s->hash_desc);
|
||||
kfree(s);
|
||||
return rc;
|
||||
}
|
||||
|
@ -888,7 +883,8 @@ struct ecryptfs_parse_tag_70_packet_silly_stack {
|
|||
struct ecryptfs_auth_tok *auth_tok;
|
||||
struct scatterlist src_sg[2];
|
||||
struct scatterlist dst_sg[2];
|
||||
struct blkcipher_desc desc;
|
||||
struct crypto_skcipher *skcipher_tfm;
|
||||
struct skcipher_request *skcipher_req;
|
||||
char fnek_sig_hex[ECRYPTFS_SIG_SIZE_HEX + 1];
|
||||
char iv[ECRYPTFS_MAX_IV_BYTES];
|
||||
char cipher_string[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
|
||||
|
@ -922,14 +918,13 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
|
|||
(*packet_size) = 0;
|
||||
(*filename_size) = 0;
|
||||
(*filename) = NULL;
|
||||
s = kmalloc(sizeof(*s), GFP_KERNEL);
|
||||
s = kzalloc(sizeof(*s), GFP_KERNEL);
|
||||
if (!s) {
|
||||
printk(KERN_ERR "%s: Out of memory whilst trying to kmalloc "
|
||||
"[%zd] bytes of kernel memory\n", __func__, sizeof(*s));
|
||||
rc = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
s->desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
|
||||
if (max_packet_size < ECRYPTFS_TAG_70_MIN_METADATA_SIZE) {
|
||||
printk(KERN_WARNING "%s: max_packet_size is [%zd]; it must be "
|
||||
"at least [%d]\n", __func__, max_packet_size,
|
||||
|
@ -992,7 +987,7 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
|
|||
rc);
|
||||
goto out;
|
||||
}
|
||||
rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&s->desc.tfm,
|
||||
rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&s->skcipher_tfm,
|
||||
&s->tfm_mutex,
|
||||
s->cipher_string);
|
||||
if (unlikely(rc)) {
|
||||
|
@ -1030,12 +1025,23 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
|
|||
__func__, rc, s->block_aligned_filename_size);
|
||||
goto out_free_unlock;
|
||||
}
|
||||
|
||||
s->skcipher_req = skcipher_request_alloc(s->skcipher_tfm, GFP_KERNEL);
|
||||
if (!s->skcipher_req) {
|
||||
printk(KERN_ERR "%s: Out of kernel memory whilst attempting to "
|
||||
"skcipher_request_alloc for %s\n", __func__,
|
||||
crypto_skcipher_driver_name(s->skcipher_tfm));
|
||||
rc = -ENOMEM;
|
||||
goto out_free_unlock;
|
||||
}
|
||||
|
||||
skcipher_request_set_callback(s->skcipher_req,
|
||||
CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL);
|
||||
|
||||
/* The characters in the first block effectively do the job of
|
||||
* the IV here, so we just use 0's for the IV. Note the
|
||||
* constraint that ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES
|
||||
* >= ECRYPTFS_MAX_IV_BYTES. */
|
||||
memset(s->iv, 0, ECRYPTFS_MAX_IV_BYTES);
|
||||
s->desc.info = s->iv;
|
||||
/* TODO: Support other key modules than passphrase for
|
||||
* filename encryption */
|
||||
if (s->auth_tok->token_type != ECRYPTFS_PASSWORD) {
|
||||
|
@ -1044,8 +1050,8 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
|
|||
"password tokens\n", __func__);
|
||||
goto out_free_unlock;
|
||||
}
|
||||
rc = crypto_blkcipher_setkey(
|
||||
s->desc.tfm,
|
||||
rc = crypto_skcipher_setkey(
|
||||
s->skcipher_tfm,
|
||||
s->auth_tok->token.password.session_key_encryption_key,
|
||||
mount_crypt_stat->global_default_fn_cipher_key_bytes);
|
||||
if (rc < 0) {
|
||||
|
@ -1058,14 +1064,14 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
|
|||
mount_crypt_stat->global_default_fn_cipher_key_bytes);
|
||||
goto out_free_unlock;
|
||||
}
|
||||
rc = crypto_blkcipher_decrypt_iv(&s->desc, s->dst_sg, s->src_sg,
|
||||
s->block_aligned_filename_size);
|
||||
skcipher_request_set_crypt(s->skcipher_req, s->src_sg, s->dst_sg,
|
||||
s->block_aligned_filename_size, s->iv);
|
||||
rc = crypto_skcipher_decrypt(s->skcipher_req);
|
||||
if (rc) {
|
||||
printk(KERN_ERR "%s: Error attempting to decrypt filename; "
|
||||
"rc = [%d]\n", __func__, rc);
|
||||
goto out_free_unlock;
|
||||
}
|
||||
s->i = 0;
|
||||
while (s->decrypted_filename[s->i] != '\0'
|
||||
&& s->i < s->block_aligned_filename_size)
|
||||
s->i++;
|
||||
|
@ -1108,6 +1114,7 @@ out:
|
|||
up_write(&(auth_tok_key->sem));
|
||||
key_put(auth_tok_key);
|
||||
}
|
||||
skcipher_request_free(s->skcipher_req);
|
||||
kfree(s);
|
||||
return rc;
|
||||
}
|
||||
|
@ -1667,9 +1674,8 @@ decrypt_passphrase_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
|
|||
struct scatterlist dst_sg[2];
|
||||
struct scatterlist src_sg[2];
|
||||
struct mutex *tfm_mutex;
|
||||
struct blkcipher_desc desc = {
|
||||
.flags = CRYPTO_TFM_REQ_MAY_SLEEP
|
||||
};
|
||||
struct crypto_skcipher *tfm;
|
||||
struct skcipher_request *req = NULL;
|
||||
int rc = 0;
|
||||
|
||||
if (unlikely(ecryptfs_verbosity > 0)) {
|
||||
|
@ -1680,7 +1686,7 @@ decrypt_passphrase_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
|
|||
auth_tok->token.password.session_key_encryption_key,
|
||||
auth_tok->token.password.session_key_encryption_key_bytes);
|
||||
}
|
||||
rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&desc.tfm, &tfm_mutex,
|
||||
rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&tfm, &tfm_mutex,
|
||||
crypt_stat->cipher);
|
||||
if (unlikely(rc)) {
|
||||
printk(KERN_ERR "Internal error whilst attempting to get "
|
||||
|
@ -1711,8 +1717,20 @@ decrypt_passphrase_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
|
|||
goto out;
|
||||
}
|
||||
mutex_lock(tfm_mutex);
|
||||
rc = crypto_blkcipher_setkey(
|
||||
desc.tfm, auth_tok->token.password.session_key_encryption_key,
|
||||
req = skcipher_request_alloc(tfm, GFP_KERNEL);
|
||||
if (!req) {
|
||||
mutex_unlock(tfm_mutex);
|
||||
printk(KERN_ERR "%s: Out of kernel memory whilst attempting to "
|
||||
"skcipher_request_alloc for %s\n", __func__,
|
||||
crypto_skcipher_driver_name(tfm));
|
||||
rc = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP,
|
||||
NULL, NULL);
|
||||
rc = crypto_skcipher_setkey(
|
||||
tfm, auth_tok->token.password.session_key_encryption_key,
|
||||
crypt_stat->key_size);
|
||||
if (unlikely(rc < 0)) {
|
||||
mutex_unlock(tfm_mutex);
|
||||
|
@ -1720,8 +1738,10 @@ decrypt_passphrase_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
|
|||
rc = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
rc = crypto_blkcipher_decrypt(&desc, dst_sg, src_sg,
|
||||
auth_tok->session_key.encrypted_key_size);
|
||||
skcipher_request_set_crypt(req, src_sg, dst_sg,
|
||||
auth_tok->session_key.encrypted_key_size,
|
||||
NULL);
|
||||
rc = crypto_skcipher_decrypt(req);
|
||||
mutex_unlock(tfm_mutex);
|
||||
if (unlikely(rc)) {
|
||||
printk(KERN_ERR "Error decrypting; rc = [%d]\n", rc);
|
||||
|
@ -1738,6 +1758,7 @@ decrypt_passphrase_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
|
|||
crypt_stat->key_size);
|
||||
}
|
||||
out:
|
||||
skcipher_request_free(req);
|
||||
return rc;
|
||||
}
|
||||
|
||||
|
@ -2191,16 +2212,14 @@ write_tag_3_packet(char *dest, size_t *remaining_bytes,
|
|||
size_t max_packet_size;
|
||||
struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
|
||||
crypt_stat->mount_crypt_stat;
|
||||
struct blkcipher_desc desc = {
|
||||
.tfm = NULL,
|
||||
.flags = CRYPTO_TFM_REQ_MAY_SLEEP
|
||||
};
|
||||
struct crypto_skcipher *tfm;
|
||||
struct skcipher_request *req;
|
||||
int rc = 0;
|
||||
|
||||
(*packet_size) = 0;
|
||||
ecryptfs_from_hex(key_rec->sig, auth_tok->token.password.signature,
|
||||
ECRYPTFS_SIG_SIZE);
|
||||
rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&desc.tfm, &tfm_mutex,
|
||||
rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&tfm, &tfm_mutex,
|
||||
crypt_stat->cipher);
|
||||
if (unlikely(rc)) {
|
||||
printk(KERN_ERR "Internal error whilst attempting to get "
|
||||
|
@ -2209,12 +2228,11 @@ write_tag_3_packet(char *dest, size_t *remaining_bytes,
|
|||
goto out;
|
||||
}
|
||||
if (mount_crypt_stat->global_default_cipher_key_size == 0) {
|
||||
struct blkcipher_alg *alg = crypto_blkcipher_alg(desc.tfm);
|
||||
|
||||
printk(KERN_WARNING "No key size specified at mount; "
|
||||
"defaulting to [%d]\n", alg->max_keysize);
|
||||
"defaulting to [%d]\n",
|
||||
crypto_skcipher_default_keysize(tfm));
|
||||
mount_crypt_stat->global_default_cipher_key_size =
|
||||
alg->max_keysize;
|
||||
crypto_skcipher_default_keysize(tfm);
|
||||
}
|
||||
if (crypt_stat->key_size == 0)
|
||||
crypt_stat->key_size =
|
||||
|
@ -2284,7 +2302,7 @@ write_tag_3_packet(char *dest, size_t *remaining_bytes,
|
|||
goto out;
|
||||
}
|
||||
mutex_lock(tfm_mutex);
|
||||
rc = crypto_blkcipher_setkey(desc.tfm, session_key_encryption_key,
|
||||
rc = crypto_skcipher_setkey(tfm, session_key_encryption_key,
|
||||
crypt_stat->key_size);
|
||||
if (rc < 0) {
|
||||
mutex_unlock(tfm_mutex);
|
||||
|
@ -2292,12 +2310,28 @@ write_tag_3_packet(char *dest, size_t *remaining_bytes,
|
|||
"context; rc = [%d]\n", rc);
|
||||
goto out;
|
||||
}
|
||||
|
||||
req = skcipher_request_alloc(tfm, GFP_KERNEL);
|
||||
if (!req) {
|
||||
mutex_unlock(tfm_mutex);
|
||||
ecryptfs_printk(KERN_ERR, "Out of kernel memory whilst "
|
||||
"attempting to skcipher_request_alloc for "
|
||||
"%s\n", crypto_skcipher_driver_name(tfm));
|
||||
rc = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP,
|
||||
NULL, NULL);
|
||||
|
||||
rc = 0;
|
||||
ecryptfs_printk(KERN_DEBUG, "Encrypting [%zd] bytes of the key\n",
|
||||
crypt_stat->key_size);
|
||||
rc = crypto_blkcipher_encrypt(&desc, dst_sg, src_sg,
|
||||
(*key_rec).enc_key_size);
|
||||
skcipher_request_set_crypt(req, src_sg, dst_sg,
|
||||
(*key_rec).enc_key_size, NULL);
|
||||
rc = crypto_skcipher_encrypt(req);
|
||||
mutex_unlock(tfm_mutex);
|
||||
skcipher_request_free(req);
|
||||
if (rc) {
|
||||
printk(KERN_ERR "Error encrypting; rc = [%d]\n", rc);
|
||||
goto out;
|
||||
|
|
|
@ -29,7 +29,6 @@
|
|||
#include <linux/module.h>
|
||||
#include <linux/namei.h>
|
||||
#include <linux/skbuff.h>
|
||||
#include <linux/crypto.h>
|
||||
#include <linux/mount.h>
|
||||
#include <linux/pagemap.h>
|
||||
#include <linux/key.h>
|
||||
|
|
|
@ -30,7 +30,6 @@
|
|||
#include <linux/page-flags.h>
|
||||
#include <linux/mount.h>
|
||||
#include <linux/file.h>
|
||||
#include <linux/crypto.h>
|
||||
#include <linux/scatterlist.h>
|
||||
#include <linux/slab.h>
|
||||
#include <asm/unaligned.h>
|
||||
|
|
|
@ -29,7 +29,6 @@
|
|||
#include <linux/slab.h>
|
||||
#include <linux/seq_file.h>
|
||||
#include <linux/file.h>
|
||||
#include <linux/crypto.h>
|
||||
#include <linux/statfs.h>
|
||||
#include <linux/magic.h>
|
||||
#include "ecryptfs_kernel.h"
|
||||
|
|
Loading…
Reference in New Issue