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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2005-2010 IBM Corporation
4 *
5 * Authors:
6 * Mimi Zohar <[email protected]>
7 * Kylene Hall <[email protected]>
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_SIGV3_REQUIRED 0x0008
24#define EVM_SETUP_COMPLETE 0x80000000 /* userland has signaled key load */
25
26#define EVM_KEY_MASK (EVM_INIT_HMAC | EVM_INIT_X509)
27#define EVM_INIT_MASK (EVM_INIT_HMAC | EVM_INIT_X509 | EVM_SETUP_COMPLETE | \
28 EVM_ALLOW_METADATA_WRITES | EVM_SIGV3_REQUIRED)
29
30struct xattr_list {
31 struct list_head list;
32 char *name;
33 bool enabled;
34};
35
36#define EVM_NEW_FILE 0x00000001
37#define EVM_IMMUTABLE_DIGSIG 0x00000002
38
39/* EVM integrity metadata associated with an inode */
40struct evm_iint_cache {
41 unsigned long flags;
42 enum integrity_status evm_status:4;
43 struct integrity_inode_attributes metadata_inode;
44};
45
46extern struct lsm_blob_sizes evm_blob_sizes;
47
48static inline struct evm_iint_cache *evm_iint_inode(const struct inode *inode)
49{
50 if (unlikely(!inode->i_security))
51 return NULL;
52
53 return inode->i_security + evm_blob_sizes.lbs_inode;
54}
55
56extern int evm_initialized;
57
58#define EVM_ATTR_FSUUID 0x0001
59
60extern int evm_hmac_attrs;
61
62/* List of EVM protected security xattrs */
63extern struct list_head evm_config_xattrnames;
64
65struct evm_digest {
66 struct ima_digest_data_hdr hdr;
67 char digest[IMA_MAX_DIGEST_SIZE];
68} __packed;
69
70int evm_protected_xattr(const char *req_xattr_name);
71
72int evm_init_key(void);
73int evm_update_evmxattr(struct dentry *dentry,
74 const char *req_xattr_name,
75 const char *req_xattr_value,
76 size_t req_xattr_value_len);
77int evm_calc_hmac(struct dentry *dentry, const char *req_xattr_name,
78 const char *req_xattr_value,
79 size_t req_xattr_value_len, struct evm_digest *data,
80 struct evm_iint_cache *iint);
81int evm_calc_hash(struct dentry *dentry, const char *req_xattr_name,
82 const char *req_xattr_value,
83 size_t req_xattr_value_len, char type,
84 struct evm_digest *data, struct evm_iint_cache *iint);
85int evm_init_hmac(struct inode *inode, const struct xattr *xattrs,
86 char *hmac_val);
87int evm_init_secfs(void);
88
89#endif