1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * Copyright (C) 2005-2010 IBM Corporation
 4 *
 5 * Authors:
 6 * Mimi Zohar <zohar@us.ibm.com>
 7 * Kylene Hall <kjhall@us.ibm.com>
 8 *
 9 * File: evm.h
10 */
11
12#ifndef __INTEGRITY_EVM_H
13#define __INTEGRITY_EVM_H
14
15#include <linux/xattr.h>
16#include <linux/security.h>
17
18#include "../integrity.h"
19
20#define EVM_INIT_HMAC	0x0001
21#define EVM_INIT_X509	0x0002
22#define EVM_ALLOW_METADATA_WRITES	0x0004
23#define EVM_SETUP_COMPLETE 0x80000000 /* userland has signaled key load */
24
25#define EVM_KEY_MASK (EVM_INIT_HMAC | EVM_INIT_X509)
26#define EVM_INIT_MASK (EVM_INIT_HMAC | EVM_INIT_X509 | EVM_SETUP_COMPLETE | \
27		       EVM_ALLOW_METADATA_WRITES)
28
29struct xattr_list {
30	struct list_head list;
31	char *name;
32	bool enabled;
33};
34
35extern int evm_initialized;
36
37#define EVM_ATTR_FSUUID		0x0001
38
39extern int evm_hmac_attrs;
40
41/* List of EVM protected security xattrs */
42extern struct list_head evm_config_xattrnames;
43
44struct evm_digest {
45	struct ima_digest_data hdr;
46	char digest[IMA_MAX_DIGEST_SIZE];
47} __packed;
48
49int evm_init_key(void);
50int evm_update_evmxattr(struct dentry *dentry,
51			const char *req_xattr_name,
52			const char *req_xattr_value,
53			size_t req_xattr_value_len);
54int evm_calc_hmac(struct dentry *dentry, const char *req_xattr_name,
55		  const char *req_xattr_value,
56		  size_t req_xattr_value_len, struct evm_digest *data);
57int evm_calc_hash(struct dentry *dentry, const char *req_xattr_name,
58		  const char *req_xattr_value,
59		  size_t req_xattr_value_len, char type,
60		  struct evm_digest *data);
61int evm_init_hmac(struct inode *inode, const struct xattr *xattr,
62		  char *hmac_val);
63int evm_init_secfs(void);
64
65#endif