ecryptfs: added ecryptfs_mount_auth_tok_only mount parameter

This patch adds a new mount parameter 'ecryptfs_mount_auth_tok_only' to
force ecryptfs to use only authentication tokens which signature has
been specified at mount time with parameters 'ecryptfs_sig' and
'ecryptfs_fnek_sig'. In this way, after disabling the passthrough and
the encrypted view modes, it's possible to make available to users only
files encrypted with the specified authentication token.

Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Cc: Dustin Kirkland <kirkland@canonical.com>
Cc: James Morris <jmorris@namei.org>
[Tyler: Clean up coding style errors found by checkpatch]
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index cbd4e18adb20..09eb5296aebb 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -208,7 +208,8 @@ enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig,
        ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata,
        ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig,
        ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes,
-       ecryptfs_opt_unlink_sigs, ecryptfs_opt_err };
+       ecryptfs_opt_unlink_sigs, ecryptfs_opt_mount_auth_tok_only,
+       ecryptfs_opt_err };
 
 static const match_table_t tokens = {
         {ecryptfs_opt_sig, "sig=%s"},
@@ -223,6 +224,7 @@ static const match_table_t tokens = {
         {ecryptfs_opt_fn_cipher, "ecryptfs_fn_cipher=%s"},
         {ecryptfs_opt_fn_cipher_key_bytes, "ecryptfs_fn_key_bytes=%u"},
         {ecryptfs_opt_unlink_sigs, "ecryptfs_unlink_sigs"},
+        {ecryptfs_opt_mount_auth_tok_only, "ecryptfs_mount_auth_tok_only"},
         {ecryptfs_opt_err, NULL}
 };
 
@@ -406,6 +408,10 @@ static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options)
                 case ecryptfs_opt_unlink_sigs:
                         mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS;
                         break;
+                case ecryptfs_opt_mount_auth_tok_only:
+                        mount_crypt_stat->flags |=
+                                ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY;
+                        break;
                 case ecryptfs_opt_err:
                 default:
                         printk(KERN_WARNING