eCryptfs: added support for the encrypted key type

The function ecryptfs_keyring_auth_tok_for_sig() has been modified in order
to search keys of both 'user' and 'encrypted' types.

Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Acked-by: Gianluca Ramunno <ramunno@polito.it>
Acked-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>

2 files changed, 47 insertions, 7 deletions

diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index bb8ec5d4301c..b36c5572b3f3 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -29,6 +29,7 @@
 #define ECRYPTFS_KERNEL_H
 
 #include <keys/user-type.h>
+#include <keys/encrypted-type.h>
 #include <linux/fs.h>
 #include <linux/fs_stack.h>
 #include <linux/namei.h>
@@ -78,11 +79,47 @@ struct ecryptfs_page_crypt_context {
         } param;
 };
 
+#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
+static inline struct ecryptfs_auth_tok *
+ecryptfs_get_encrypted_key_payload_data(struct key *key)
+{
+        if (key->type == &key_type_encrypted)
+                return (struct ecryptfs_auth_tok *)
+                        (&((struct encrypted_key_payload *)key->payload.data)->payload_data);
+        else
+                return NULL;
+}
+
+static inline struct key *ecryptfs_get_encrypted_key(char *sig)
+{
+        return request_key(&key_type_encrypted, sig, NULL);
+}
+
+#else
+static inline struct ecryptfs_auth_tok *
+ecryptfs_get_encrypted_key_payload_data(struct key *key)
+{
+        return NULL;
+}
+
+static inline struct key *ecryptfs_get_encrypted_key(char *sig)
+{
+        return ERR_PTR(-ENOKEY);
+}
+
+#endif /* CONFIG_ENCRYPTED_KEYS */
+
 static inline struct ecryptfs_auth_tok *
 ecryptfs_get_key_payload_data(struct key *key)
 {
-        return (struct ecryptfs_auth_tok *)
-                (((struct user_key_payload*)key->payload.data)->data);
+        struct ecryptfs_auth_tok *auth_tok;
+
+        auth_tok = ecryptfs_get_encrypted_key_payload_data(key);
+        if (!auth_tok)
+                return (struct ecryptfs_auth_tok *)
+                        (((struct user_key_payload *)key->payload.data)->data);
+        else
+                return auth_tok;
 }
 
 #define ECRYPTFS_MAX_KEYSET_SIZE 1024
diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
index 27a7fefb83eb..2cff13ac8937 100644
--- a/fs/ecryptfs/keystore.c
+++ b/fs/ecryptfs/keystore.c
@@ -1635,11 +1635,14 @@ int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
 
         (*auth_tok_key) = request_key(&key_type_user, sig, NULL);
         if (!(*auth_tok_key) || IS_ERR(*auth_tok_key)) {
-                printk(KERN_ERR "Could not find key with description: [%s]\n",
-                       sig);
-                rc = process_request_key_err(PTR_ERR(*auth_tok_key));
-                (*auth_tok_key) = NULL;
-                goto out;
+                (*auth_tok_key) = ecryptfs_get_encrypted_key(sig);
+                if (!(*auth_tok_key) || IS_ERR(*auth_tok_key)) {
+                        printk(KERN_ERR "Could not find key with description: [%s]\n",
+                              sig);
+                        rc = process_request_key_err(PTR_ERR(*auth_tok_key));
+                        (*auth_tok_key) = NULL;
+                        goto out;
+                }
         }
         down_write(&(*auth_tok_key)->sem);
         rc = ecryptfs_verify_auth_tok_from_key(*auth_tok_key, auth_tok);