eCryptfs: allow userspace messaging to be disabled

When the userspace messaging (for the less common case of userspace key
wrap/unwrap via ecryptfsd) is not needed, allow eCryptfs to build with
it removed. This saves on kernel code size and reduces potential attack
surface by removing the /dev/ecryptfs node.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>

diff --git a/fs/ecryptfs/Kconfig b/fs/ecryptfs/Kconfig
index cc16562..1f63120 100644 (file)
--- a/fs/ecryptfs/Kconfig
+++ b/fs/ecryptfs/Kconfig
@@ -12,3 +12,11 @@ config ECRYPT_FS
 
          To compile this file system support as a module, choose M here: the
          module will be called ecryptfs.
+
+config ECRYPT_FS_MESSAGING
+       bool "Enable notifications for userspace key wrap/unwrap"
+       depends on ECRYPT_FS
+       help
+         Enables the /dev/ecryptfs entry for use by ecryptfsd. This allows
+         for userspace to wrap/unwrap file encryption keys by other
+         backends, like OpenSSL.

diff --git a/fs/ecryptfs/Makefile b/fs/ecryptfs/Makefile
index 2cc9ee4..49678a6 100644 (file)
--- a/fs/ecryptfs/Makefile
+++ b/fs/ecryptfs/Makefile
@@ -1,7 +1,10 @@
 #
-# Makefile for the Linux 2.6 eCryptfs
+# Makefile for the Linux eCryptfs
 #
 
 obj-$(CONFIG_ECRYPT_FS) += ecryptfs.o
 
-ecryptfs-objs := dentry.o file.o inode.o main.o super.o mmap.o read_write.o crypto.o keystore.o messaging.o miscdev.o kthread.o debug.o
+ecryptfs-y := dentry.o file.o inode.o main.o super.o mmap.o read_write.o \
+             crypto.o keystore.o kthread.o debug.o
+
+ecryptfs-$(CONFIG_ECRYPT_FS_MESSAGING) += messaging.o miscdev.o

diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index cfb4b9f..a9df69e 100644 (file)
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -172,6 +172,19 @@ ecryptfs_get_key_payload_data(struct key *key)
 #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE 24
 #define ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN (18 + 1 + 4 + 1 + 32)
 
+#ifdef CONFIG_ECRYPT_FS_MESSAGING
+# define ECRYPTFS_VERSIONING_MASK_MESSAGING (ECRYPTFS_VERSIONING_DEVMISC \
+                                            | ECRYPTFS_VERSIONING_PUBKEY)
+#else
+# define ECRYPTFS_VERSIONING_MASK_MESSAGING 0
+#endif
+
+#define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
+                                 | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
+                                 | ECRYPTFS_VERSIONING_XATTR \
+                                 | ECRYPTFS_VERSIONING_MULTKEY \
+                                 | ECRYPTFS_VERSIONING_MASK_MESSAGING \
+                                 | ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION)
 struct ecryptfs_key_sig {
        struct list_head crypt_stat_list;
        char keysig[ECRYPTFS_SIG_SIZE_HEX + 1];
@@ -399,7 +412,9 @@ struct ecryptfs_daemon {
        struct hlist_node euid_chain;
 };
 
+#ifdef CONFIG_ECRYPT_FS_MESSAGING
 extern struct mutex ecryptfs_daemon_hash_mux;
+#endif
 
 static inline size_t
 ecryptfs_lower_header_size(struct ecryptfs_crypt_stat *crypt_stat)
@@ -604,6 +619,7 @@ int
 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
                  size_t size, int flags);
 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
+#ifdef CONFIG_ECRYPT_FS_MESSAGING
 int ecryptfs_process_response(struct ecryptfs_daemon *daemon,
                              struct ecryptfs_message *msg, u32 seq);
 int ecryptfs_send_message(char *data, int data_len,
@@ -612,6 +628,24 @@ int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
                               struct ecryptfs_message **emsg);
 int ecryptfs_init_messaging(void);
 void ecryptfs_release_messaging(void);
+#else
+static inline int ecryptfs_init_messaging(void)
+{
+       return 0;
+}
+static inline void ecryptfs_release_messaging(void)
+{ }
+static inline int ecryptfs_send_message(char *data, int data_len,
+                                       struct ecryptfs_msg_ctx **msg_ctx)
+{
+       return -ENOTCONN;
+}
+static inline int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
+                                            struct ecryptfs_message **emsg)
+{
+       return -ENOMSG;
+}
+#endif
 
 void
 ecryptfs_write_header_metadata(char *virt,
@@ -649,12 +683,11 @@ int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
                                     size_t offset_in_page, size_t size,
                                     struct inode *ecryptfs_inode);
 struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index);
-int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
-int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon);
 int ecryptfs_parse_packet_length(unsigned char *data, size_t *size,
                                 size_t *length_size);
 int ecryptfs_write_packet_length(char *dest, size_t size,
                                 size_t *packet_size_length);
+#ifdef CONFIG_ECRYPT_FS_MESSAGING
 int ecryptfs_init_ecryptfs_miscdev(void);
 void ecryptfs_destroy_ecryptfs_miscdev(void);
 int ecryptfs_send_miscdev(char *data, size_t data_size,
@@ -663,6 +696,9 @@ int ecryptfs_send_miscdev(char *data, size_t data_size,
 void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
 int
 ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, struct file *file);
+int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
+int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon);
+#endif
 int ecryptfs_init_kthread(void);
 void ecryptfs_destroy_kthread(void);
 int ecryptfs_privileged_open(struct file **lower_file,

diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
index 5aceff2..7d52806 100644 (file)
--- a/fs/ecryptfs/keystore.c
+++ b/fs/ecryptfs/keystore.c
@@ -1168,7 +1168,7 @@ decrypt_pki_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
        rc = ecryptfs_send_message(payload, payload_len, &msg_ctx);
        if (rc) {
                ecryptfs_printk(KERN_ERR, "Error sending message to "
-                               "ecryptfsd\n");
+                               "ecryptfsd: %d\n", rc);
                goto out;
        }
        rc = ecryptfs_wait_for_response(msg_ctx, &msg);
@@ -1988,7 +1988,7 @@ pki_encrypt_session_key(struct key *auth_tok_key,
        rc = ecryptfs_send_message(payload, payload_len, &msg_ctx);
        if (rc) {
                ecryptfs_printk(KERN_ERR, "Error sending message to "
-                               "ecryptfsd\n");
+                               "ecryptfsd: %d\n", rc);
                goto out;
        }
        rc = ecryptfs_wait_for_response(msg_ctx, &msg);

diff --git a/include/linux/ecryptfs.h b/include/linux/ecryptfs.h
index 2224a8c..8d5ab99 100644 (file)
--- a/include/linux/ecryptfs.h
+++ b/include/linux/ecryptfs.h
@@ -6,9 +6,8 @@
 #define ECRYPTFS_VERSION_MINOR 0x04
 #define ECRYPTFS_SUPPORTED_FILE_VERSION 0x03
 /* These flags indicate which features are supported by the kernel
- * module; userspace tools such as the mount helper read
- * ECRYPTFS_VERSIONING_MASK from a sysfs handle in order to determine
- * how to behave. */
+ * module; userspace tools such as the mount helper read the feature
+ * bits from a sysfs handle in order to determine how to behave. */
 #define ECRYPTFS_VERSIONING_PASSPHRASE            0x00000001
 #define ECRYPTFS_VERSIONING_PUBKEY                0x00000002
 #define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004
@@ -19,13 +18,6 @@
 #define ECRYPTFS_VERSIONING_HMAC                  0x00000080
 #define ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION   0x00000100
 #define ECRYPTFS_VERSIONING_GCM                   0x00000200
-#define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
-                                 | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
-                                 | ECRYPTFS_VERSIONING_PUBKEY \
-                                 | ECRYPTFS_VERSIONING_XATTR \
-                                 | ECRYPTFS_VERSIONING_MULTKEY \
-                                 | ECRYPTFS_VERSIONING_DEVMISC \
-                                 | ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION)
 #define ECRYPTFS_MAX_PASSWORD_LENGTH 64
 #define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH
 #define ECRYPTFS_SALT_SIZE 8