From: Sascha Hauer <s.hauer@pengutronix.de>
To: linux-mtd@lists.infradead.org
Cc: David Gstir <david@sigma-star.at>,
Richard Weinberger <richard@nod.at>,
kernel@pengutronix.de, linux-kernel@vger.kernel.org,
Sascha Hauer <s.hauer@pengutronix.de>
Subject: [PATCH 23/25] ubifs: Enable authentication support
Date: Wed, 4 Jul 2018 14:41:35 +0200 [thread overview]
Message-ID: <20180704124137.13396-24-s.hauer@pengutronix.de> (raw)
In-Reply-To: <20180704124137.13396-1-s.hauer@pengutronix.de>
With the preparations all being done this patch now enables authentication
support for UBIFS. Authentication is enabled when the newly introduced
auth_key and auth_hash_name mount options are passed. auth_key provides
the key which is used for authentication whereas auth_hash_name provides
the hashing algorithm used for this FS. Passing these options make
authentication mandatory and only UBIFS images that can be authenticated
with the given key are allowed.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
Documentation/filesystems/ubifs.txt | 7 ++++++
fs/ubifs/Kconfig | 10 ++++++++
fs/ubifs/super.c | 36 ++++++++++++++++++++++++++++-
3 files changed, 52 insertions(+), 1 deletion(-)
diff --git a/Documentation/filesystems/ubifs.txt b/Documentation/filesystems/ubifs.txt
index a0a61d2f389f..acc80442a3bb 100644
--- a/Documentation/filesystems/ubifs.txt
+++ b/Documentation/filesystems/ubifs.txt
@@ -91,6 +91,13 @@ chk_data_crc do not skip checking CRCs on data nodes
compr=none override default compressor and set it to "none"
compr=lzo override default compressor and set it to "lzo"
compr=zlib override default compressor and set it to "zlib"
+auth_key= specify the key used for authenticating the filesystem.
+ Passing this option makes authentication mandatory.
+ The passed key must be present in the kernel keyring
+ and must be of type 'logon'
+auth_hash_name= The hash algorithm used for authentication. Used for
+ both hashing and for creating HMACs. Typical values
+ include "sha256" or "sha512"
Quick usage instructions
diff --git a/fs/ubifs/Kconfig b/fs/ubifs/Kconfig
index 2a0b5f1134a4..9da1e7c21b7f 100644
--- a/fs/ubifs/Kconfig
+++ b/fs/ubifs/Kconfig
@@ -75,3 +75,13 @@ config UBIFS_FS_SECURITY
the extended attribute support in advance.
If you are not using a security module, say N.
+
+config UBIFS_FS_AUTHENTICATION
+ bool "UBIFS authentication support"
+ select CRYPTO_HMAC
+ help
+ Enable authentication support for UBIFS. This feature offers protection
+ against offline changes for both data and metadata of the filesystem.
+ If you say yes here you should also select a hashing algorithm such as
+ sha256, these are not selected automatically since there are many
+ different options.
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index de7bf613addc..b2ccd2d7ce4d 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -577,7 +577,9 @@ static int init_constants_early(struct ubifs_info *c)
c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ;
c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ;
c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ;
- c->ranges[UBIFS_AUTH_NODE].len = UBIFS_AUTH_NODE_SZ;
+ c->ranges[UBIFS_AUTH_NODE].min_len = UBIFS_AUTH_NODE_SZ;
+ c->ranges[UBIFS_AUTH_NODE].max_len = UBIFS_AUTH_NODE_SZ +
+ UBIFS_MAX_HMAC_LEN;
c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ;
c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ;
@@ -932,6 +934,8 @@ static int check_volume_empty(struct ubifs_info *c)
* Opt_chk_data_crc: check CRCs when reading data nodes
* Opt_no_chk_data_crc: do not check CRCs when reading data nodes
* Opt_override_compr: override default compressor
+ * Opt_auth_key: The key name used for authentication
+ * Opt_auth_hash_name: The hash type used for authentication
* Opt_err: just end of array marker
*/
enum {
@@ -942,6 +946,8 @@ enum {
Opt_chk_data_crc,
Opt_no_chk_data_crc,
Opt_override_compr,
+ Opt_auth_key,
+ Opt_auth_hash_name,
Opt_ignore,
Opt_err,
};
@@ -954,6 +960,8 @@ static const match_table_t tokens = {
{Opt_chk_data_crc, "chk_data_crc"},
{Opt_no_chk_data_crc, "no_chk_data_crc"},
{Opt_override_compr, "compr=%s"},
+ {Opt_auth_key, "auth_key=%s"},
+ {Opt_auth_hash_name, "auth_hash_name=%s"},
{Opt_ignore, "ubi=%s"},
{Opt_ignore, "vol=%s"},
{Opt_err, NULL},
@@ -1056,6 +1064,16 @@ static int ubifs_parse_options(struct ubifs_info *c, char *options,
c->default_compr = c->mount_opts.compr_type;
break;
}
+ case Opt_auth_key:
+ c->auth_key_name = kstrdup(args[0].from, GFP_KERNEL);
+ if (!c->auth_key_name)
+ return -ENOMEM;
+ break;
+ case Opt_auth_hash_name:
+ c->auth_hash_name = kstrdup(args[0].from, GFP_KERNEL);
+ if (!c->auth_hash_name)
+ return -ENOMEM;
+ break;
case Opt_ignore:
break;
default:
@@ -1235,6 +1253,19 @@ static int mount_ubifs(struct ubifs_info *c)
c->mounting = 1;
+ if (c->auth_key_name) {
+ if (IS_ENABLED(CONFIG_UBIFS_FS_AUTHENTICATION)) {
+ err = ubifs_init_authentication(c);
+ if (err)
+ goto out_free;
+ } else {
+ ubifs_err(c, "auth_key_name, but UBIFS is built without"
+ " authentication support");
+ err = -EINVAL;
+ goto out_free;
+ }
+ }
+
err = ubifs_read_superblock(c);
if (err)
goto out_free;
@@ -1552,7 +1583,10 @@ static void ubifs_umount(struct ubifs_info *c)
free_wbufs(c);
free_orphans(c);
ubifs_lpt_free(c, 0);
+ ubifs_exit_authentication(c);
+ kfree(c->auth_key_name);
+ kfree(c->auth_hash_name);
kfree(c->cbuf);
kfree(c->rcvrd_mst_node);
kfree(c->mst_node);
--
2.18.0
next prev parent reply other threads:[~2018-07-04 12:44 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-04 12:41 [PATCH 00/25] UBIFS authentication support Sascha Hauer
2018-07-04 12:41 ` [PATCH 01/25] ubifs: refactor create_default_filesystem() Sascha Hauer
2018-07-04 12:41 ` [PATCH 02/25] ubifs: pass ubifs_zbranch to try_read_node() Sascha Hauer
2018-07-04 12:41 ` [PATCH 03/25] ubifs: pass ubifs_zbranch to read_znode() Sascha Hauer
2018-07-04 12:41 ` [PATCH 04/25] ubifs: export pnode_lookup as ubifs_pnode_lookup Sascha Hauer
2018-07-04 12:41 ` [PATCH 05/25] ubifs: implement ubifs_lpt_lookup using ubifs_pnode_lookup Sascha Hauer
2018-08-13 6:31 ` Sascha Hauer
2018-08-13 6:34 ` Richard Weinberger
2018-08-13 8:12 ` Sascha Hauer
2018-08-13 11:30 ` Richard Weinberger
2018-08-26 20:59 ` Richard Weinberger
2018-07-04 12:41 ` [PATCH 06/25] ubifs: drop write_node Sascha Hauer
2018-07-04 12:41 ` [PATCH 07/25] ubifs: Store read superblock node Sascha Hauer
2018-08-27 12:50 ` Richard Weinberger
2018-07-04 12:41 ` [PATCH 08/25] ubifs: Format changes for authentication support Sascha Hauer
2018-07-04 12:41 ` [PATCH 09/25] ubifs: add separate functions to init/crc a node Sascha Hauer
2018-07-04 12:41 ` [PATCH 10/25] ubifs: add helper functions for authentication support Sascha Hauer
2018-08-27 12:50 ` Richard Weinberger
2018-08-29 6:30 ` Sascha Hauer
2018-07-04 12:41 ` [PATCH 11/25] ubifs: Create functions to embed a HMAC in a node Sascha Hauer
2018-07-04 12:41 ` [PATCH 12/25] ubifs: Add hashes to the tree node cache Sascha Hauer
2018-08-27 19:18 ` Richard Weinberger
2018-08-29 11:16 ` Sascha Hauer
2018-07-04 12:41 ` [PATCH 13/25] ubifs: authentication: Add hashes to index nodes Sascha Hauer
2018-08-27 19:36 ` Richard Weinberger
2018-09-07 10:25 ` Sascha Hauer
2018-07-04 12:41 ` [PATCH 14/25] ubifs: Add authentication nodes to journal Sascha Hauer
2018-07-08 2:59 ` kbuild test robot
2018-08-27 20:48 ` Richard Weinberger
2018-08-29 14:38 ` Sascha Hauer
2018-08-29 14:54 ` Richard Weinberger
2018-08-30 13:41 ` Sascha Hauer
2018-09-02 19:45 ` Richard Weinberger
2018-07-04 12:41 ` [PATCH 15/25] ubifs: Add auth nodes to garbage collector journal head Sascha Hauer
2018-08-27 20:51 ` Richard Weinberger
2018-08-30 14:43 ` Sascha Hauer
2018-07-04 12:41 ` [PATCH 16/25] ubifs: authenticate replayed journal Sascha Hauer
2018-07-08 6:08 ` kbuild test robot
2018-08-27 21:16 ` Richard Weinberger
2018-07-04 12:41 ` [PATCH 17/25] ubifs: authentication: authenticate LPT Sascha Hauer
2018-07-04 12:41 ` [PATCH 18/25] ubfis: authentication: authenticate master node Sascha Hauer
2018-07-04 12:41 ` [PATCH 19/25] ubifs: Create hash for default LPT Sascha Hauer
2018-07-04 12:41 ` [PATCH 20/25] ubifs: authentication: Authenticate super block node Sascha Hauer
2018-07-04 12:41 ` [PATCH 21/25] ubifs: Add hashes and HMACs to default filesystem Sascha Hauer
2018-07-04 12:41 ` [PATCH 22/25] ubifs: do not update inode size in-place in authenticated mode Sascha Hauer
2018-07-04 12:41 ` Sascha Hauer [this message]
2018-07-04 12:41 ` [PATCH 24/25] ubifs: support offline signed images Sascha Hauer
2018-07-04 12:41 ` [PATCH 25/25] Documentation: ubifs: Add authentication whitepaper Sascha Hauer
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