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
29 struct xattr_list {
30 struct list_head list;
31 char *name;
32 bool enabled;
33 };
34
35 #define EVM_NEW_FILE 0x00000001
36 #define EVM_IMMUTABLE_DIGSIG 0x00000002
37
38 /* EVM integrity metadata associated with an inode */
39 struct evm_iint_cache {
40 unsigned long flags;
41 enum integrity_status evm_status:4;
42 struct integrity_inode_attributes metadata_inode;
43 };
44
45 extern struct lsm_blob_sizes evm_blob_sizes;
46
evm_iint_inode(const struct inode * inode)47 static inline struct evm_iint_cache *evm_iint_inode(const struct inode *inode)
48 {
49 if (unlikely(!inode->i_security))
50 return NULL;
51
52 return inode->i_security + evm_blob_sizes.lbs_inode;
53 }
54
55 extern int evm_initialized;
56
57 #define EVM_ATTR_FSUUID 0x0001
58
59 extern int evm_hmac_attrs;
60
61 /* List of EVM protected security xattrs */
62 extern struct list_head evm_config_xattrnames;
63
64 struct evm_digest {
65 struct ima_digest_data_hdr hdr;
66 char digest[IMA_MAX_DIGEST_SIZE];
67 } __packed;
68
69 int evm_protected_xattr(const char *req_xattr_name);
70
71 int evm_init_key(void);
72 int evm_update_evmxattr(struct dentry *dentry,
73 const char *req_xattr_name,
74 const char *req_xattr_value,
75 size_t req_xattr_value_len);
76 int evm_calc_hmac(struct dentry *dentry, const char *req_xattr_name,
77 const char *req_xattr_value,
78 size_t req_xattr_value_len, struct evm_digest *data,
79 struct evm_iint_cache *iint);
80 int evm_calc_hash(struct dentry *dentry, const char *req_xattr_name,
81 const char *req_xattr_value,
82 size_t req_xattr_value_len, char type,
83 struct evm_digest *data, struct evm_iint_cache *iint);
84 int evm_init_hmac(struct inode *inode, const struct xattr *xattrs,
85 char *hmac_val);
86 int evm_init_secfs(void);
87
88 #endif
89