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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/fs/ubifs/ubifs-media.h
....@@ -1,20 +1,8 @@
1
+/* SPDX-License-Identifier: GPL-2.0-only */
12 /*
23  * This file is part of UBIFS.
34  *
45  * Copyright (C) 2006-2008 Nokia Corporation.
5
- *
6
- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License version 2 as published by
8
- * the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful, but WITHOUT
11
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13
- * more details.
14
- *
15
- * You should have received a copy of the GNU General Public License along with
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- * this program; if not, write to the Free Software Foundation, Inc., 51
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- * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
186  *
197  * Authors: Artem Bityutskiy (Битюцкий Артём)
208  *          Adrian Hunter
....@@ -286,6 +274,9 @@
286274 #define UBIFS_IDX_NODE_SZ  sizeof(struct ubifs_idx_node)
287275 #define UBIFS_CS_NODE_SZ   sizeof(struct ubifs_cs_node)
288276 #define UBIFS_ORPH_NODE_SZ sizeof(struct ubifs_orph_node)
277
+#define UBIFS_AUTH_NODE_SZ sizeof(struct ubifs_auth_node)
278
+#define UBIFS_SIG_NODE_SZ  sizeof(struct ubifs_sig_node)
279
+
289280 /* Extended attribute entry nodes are identical to directory entry nodes */
290281 #define UBIFS_XENT_NODE_SZ UBIFS_DENT_NODE_SZ
291282 /* Only this does not have to be multiple of 8 bytes */
....@@ -300,12 +291,20 @@
300291 /* The largest UBIFS node */
301292 #define UBIFS_MAX_NODE_SZ UBIFS_MAX_INO_NODE_SZ
302293 
294
+/* The maxmimum size of a hash, enough for sha512 */
295
+#define UBIFS_MAX_HASH_LEN 64
296
+
297
+/* The maxmimum size of a hmac, enough for hmac(sha512) */
298
+#define UBIFS_MAX_HMAC_LEN 64
299
+
303300 /*
304301  * xattr name of UBIFS encryption context, we don't use a prefix
305302  * nor a long name to not waste space on the flash.
306303  */
307304 #define UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT "c"
308305 
306
+/* Type field in ubifs_sig_node */
307
+#define UBIFS_SIGNATURE_TYPE_PKCS7	1
309308 
310309 /*
311310  * On-flash inode flags.
....@@ -341,12 +340,14 @@
341340  * UBIFS_COMPR_NONE: no compression
342341  * UBIFS_COMPR_LZO: LZO compression
343342  * UBIFS_COMPR_ZLIB: ZLIB compression
343
+ * UBIFS_COMPR_ZSTD: ZSTD compression
344344  * UBIFS_COMPR_TYPES_CNT: count of supported compression types
345345  */
346346 enum {
347347 	UBIFS_COMPR_NONE,
348348 	UBIFS_COMPR_LZO,
349349 	UBIFS_COMPR_ZLIB,
350
+	UBIFS_COMPR_ZSTD,
350351 	UBIFS_COMPR_TYPES_CNT,
351352 };
352353 
....@@ -365,6 +366,8 @@
365366  * UBIFS_IDX_NODE: index node
366367  * UBIFS_CS_NODE: commit start node
367368  * UBIFS_ORPH_NODE: orphan node
369
+ * UBIFS_AUTH_NODE: authentication node
370
+ * UBIFS_SIG_NODE: signature node
368371  * UBIFS_NODE_TYPES_CNT: count of supported node types
369372  *
370373  * Note, we index arrays by these numbers, so keep them low and contiguous.
....@@ -384,6 +387,8 @@
384387 	UBIFS_IDX_NODE,
385388 	UBIFS_CS_NODE,
386389 	UBIFS_ORPH_NODE,
390
+	UBIFS_AUTH_NODE,
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+	UBIFS_SIG_NODE,
387392 	UBIFS_NODE_TYPES_CNT,
388393 };
389394 
....@@ -421,15 +426,19 @@
421426  * UBIFS_FLG_DOUBLE_HASH: store a 32bit cookie in directory entry nodes to
422427  *			  support 64bit cookies for lookups by hash
423428  * UBIFS_FLG_ENCRYPTION: this filesystem contains encrypted files
429
+ * UBIFS_FLG_AUTHENTICATION: this filesystem contains hashes for authentication
424430  */
425431 enum {
426432 	UBIFS_FLG_BIGLPT = 0x02,
427433 	UBIFS_FLG_SPACE_FIXUP = 0x04,
428434 	UBIFS_FLG_DOUBLE_HASH = 0x08,
429435 	UBIFS_FLG_ENCRYPTION = 0x10,
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+	UBIFS_FLG_AUTHENTICATION = 0x20,
430437 };
431438 
432
-#define UBIFS_FLG_MASK (UBIFS_FLG_BIGLPT|UBIFS_FLG_SPACE_FIXUP|UBIFS_FLG_DOUBLE_HASH|UBIFS_FLG_ENCRYPTION)
439
+#define UBIFS_FLG_MASK (UBIFS_FLG_BIGLPT | UBIFS_FLG_SPACE_FIXUP | \
440
+		UBIFS_FLG_DOUBLE_HASH | UBIFS_FLG_ENCRYPTION | \
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+		UBIFS_FLG_AUTHENTICATION)
433442 
434443 /**
435444  * struct ubifs_ch - common header node.
....@@ -633,6 +642,12 @@
633642  * @time_gran: time granularity in nanoseconds
634643  * @uuid: UUID generated when the file system image was created
635644  * @ro_compat_version: UBIFS R/O compatibility version
645
+ * @hmac: HMAC to authenticate the superblock node
646
+ * @hmac_wkm: HMAC of a well known message (the string "UBIFS") as a convenience
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+ *            to the user to check if the correct key is passed.
648
+ * @hash_algo: The hash algo used for this filesystem (one of enum hash_algo)
649
+ * @hash_mst: hash of the master node, only valid for signed images in which the
650
+ *            master node does not contain a hmac
636651  */
637652 struct ubifs_sb_node {
638653 	struct ubifs_ch ch;
....@@ -660,7 +675,11 @@
660675 	__le32 time_gran;
661676 	__u8 uuid[16];
662677 	__le32 ro_compat_version;
663
-	__u8 padding2[3968];
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+	__u8 hmac[UBIFS_MAX_HMAC_LEN];
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+	__u8 hmac_wkm[UBIFS_MAX_HMAC_LEN];
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+	__le16 hash_algo;
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+	__u8 hash_mst[UBIFS_MAX_HASH_LEN];
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+	__u8 padding2[3774];
664683 } __packed;
665684 
666685 /**
....@@ -695,6 +714,9 @@
695714  * @empty_lebs: number of empty logical eraseblocks
696715  * @idx_lebs: number of indexing logical eraseblocks
697716  * @leb_cnt: count of LEBs used by file-system
717
+ * @hash_root_idx: the hash of the root index node
718
+ * @hash_lpt: the hash of the LPT
719
+ * @hmac: HMAC to authenticate the master node
698720  * @padding: reserved for future, zeroes
699721  */
700722 struct ubifs_mst_node {
....@@ -727,7 +749,10 @@
727749 	__le32 empty_lebs;
728750 	__le32 idx_lebs;
729751 	__le32 leb_cnt;
730
-	__u8 padding[344];
752
+	__u8 hash_root_idx[UBIFS_MAX_HASH_LEN];
753
+	__u8 hash_lpt[UBIFS_MAX_HASH_LEN];
754
+	__u8 hmac[UBIFS_MAX_HMAC_LEN];
755
+	__u8 padding[152];
731756 } __packed;
732757 
733758 /**
....@@ -747,11 +772,42 @@
747772 } __packed;
748773 
749774 /**
775
+ * struct ubifs_auth_node - node for authenticating other nodes
776
+ * @ch: common header
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+ * @hmac: The HMAC
778
+ */
779
+struct ubifs_auth_node {
780
+	struct ubifs_ch ch;
781
+	__u8 hmac[];
782
+} __packed;
783
+
784
+/**
785
+ * struct ubifs_sig_node - node for signing other nodes
786
+ * @ch: common header
787
+ * @type: type of the signature, currently only UBIFS_SIGNATURE_TYPE_PKCS7
788
+ * supported
789
+ * @len: The length of the signature data
790
+ * @padding: reserved for future, zeroes
791
+ * @sig: The signature data
792
+ */
793
+struct ubifs_sig_node {
794
+	struct ubifs_ch ch;
795
+	__le32 type;
796
+	__le32 len;
797
+	__u8 padding[32];
798
+	__u8 sig[];
799
+} __packed;
800
+
801
+/**
750802  * struct ubifs_branch - key/reference/length branch
751803  * @lnum: LEB number of the target node
752804  * @offs: offset within @lnum
753805  * @len: target node length
754806  * @key: key
807
+ *
808
+ * In an authenticated UBIFS we have the hash of the referenced node after @key.
809
+ * This can't be added to the struct type definition because @key is a
810
+ * dynamically sized element already.
755811  */
756812 struct ubifs_branch {
757813 	__le32 lnum;