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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * evm.h
4 *
5 * Copyright (c) 2009 IBM Corporation
6 * Author: Mimi Zohar <zohar@us.ibm.com>
7 */
8
9#ifndef _LINUX_EVM_H
10#define _LINUX_EVM_H
11
12#include <linux/integrity.h>
13#include <linux/xattr.h>
14
15struct integrity_iint_cache;
16
17#ifdef CONFIG_EVM
18extern int evm_set_key(void *key, size_t keylen);
19extern enum integrity_status evm_verifyxattr(struct dentry *dentry,
20 const char *xattr_name,
21 void *xattr_value,
22 size_t xattr_value_len,
23 struct integrity_iint_cache *iint);
24extern int evm_inode_setattr(struct mnt_idmap *idmap,
25 struct dentry *dentry, struct iattr *attr);
26extern void evm_inode_post_setattr(struct dentry *dentry, int ia_valid);
27extern int evm_inode_setxattr(struct mnt_idmap *idmap,
28 struct dentry *dentry, const char *name,
29 const void *value, size_t size);
30extern void evm_inode_post_setxattr(struct dentry *dentry,
31 const char *xattr_name,
32 const void *xattr_value,
33 size_t xattr_value_len);
34extern int evm_inode_removexattr(struct mnt_idmap *idmap,
35 struct dentry *dentry, const char *xattr_name);
36extern void evm_inode_post_removexattr(struct dentry *dentry,
37 const char *xattr_name);
38static inline void evm_inode_post_remove_acl(struct mnt_idmap *idmap,
39 struct dentry *dentry,
40 const char *acl_name)
41{
42 evm_inode_post_removexattr(dentry, acl_name);
43}
44extern int evm_inode_set_acl(struct mnt_idmap *idmap,
45 struct dentry *dentry, const char *acl_name,
46 struct posix_acl *kacl);
47static inline int evm_inode_remove_acl(struct mnt_idmap *idmap,
48 struct dentry *dentry,
49 const char *acl_name)
50{
51 return evm_inode_set_acl(idmap, dentry, acl_name, NULL);
52}
53static inline void evm_inode_post_set_acl(struct dentry *dentry,
54 const char *acl_name,
55 struct posix_acl *kacl)
56{
57 return evm_inode_post_setxattr(dentry, acl_name, NULL, 0);
58}
59
60int evm_inode_init_security(struct inode *inode, struct inode *dir,
61 const struct qstr *qstr, struct xattr *xattrs,
62 int *xattr_count);
63extern bool evm_revalidate_status(const char *xattr_name);
64extern int evm_protected_xattr_if_enabled(const char *req_xattr_name);
65extern int evm_read_protected_xattrs(struct dentry *dentry, u8 *buffer,
66 int buffer_size, char type,
67 bool canonical_fmt);
68#ifdef CONFIG_FS_POSIX_ACL
69extern int posix_xattr_acl(const char *xattrname);
70#else
71static inline int posix_xattr_acl(const char *xattrname)
72{
73 return 0;
74}
75#endif
76#else
77
78static inline int evm_set_key(void *key, size_t keylen)
79{
80 return -EOPNOTSUPP;
81}
82
83#ifdef CONFIG_INTEGRITY
84static inline enum integrity_status evm_verifyxattr(struct dentry *dentry,
85 const char *xattr_name,
86 void *xattr_value,
87 size_t xattr_value_len,
88 struct integrity_iint_cache *iint)
89{
90 return INTEGRITY_UNKNOWN;
91}
92#endif
93
94static inline int evm_inode_setattr(struct mnt_idmap *idmap,
95 struct dentry *dentry, struct iattr *attr)
96{
97 return 0;
98}
99
100static inline void evm_inode_post_setattr(struct dentry *dentry, int ia_valid)
101{
102 return;
103}
104
105static inline int evm_inode_setxattr(struct mnt_idmap *idmap,
106 struct dentry *dentry, const char *name,
107 const void *value, size_t size)
108{
109 return 0;
110}
111
112static inline void evm_inode_post_setxattr(struct dentry *dentry,
113 const char *xattr_name,
114 const void *xattr_value,
115 size_t xattr_value_len)
116{
117 return;
118}
119
120static inline int evm_inode_removexattr(struct mnt_idmap *idmap,
121 struct dentry *dentry,
122 const char *xattr_name)
123{
124 return 0;
125}
126
127static inline void evm_inode_post_removexattr(struct dentry *dentry,
128 const char *xattr_name)
129{
130 return;
131}
132
133static inline void evm_inode_post_remove_acl(struct mnt_idmap *idmap,
134 struct dentry *dentry,
135 const char *acl_name)
136{
137 return;
138}
139
140static inline int evm_inode_set_acl(struct mnt_idmap *idmap,
141 struct dentry *dentry, const char *acl_name,
142 struct posix_acl *kacl)
143{
144 return 0;
145}
146
147static inline int evm_inode_remove_acl(struct mnt_idmap *idmap,
148 struct dentry *dentry,
149 const char *acl_name)
150{
151 return 0;
152}
153
154static inline void evm_inode_post_set_acl(struct dentry *dentry,
155 const char *acl_name,
156 struct posix_acl *kacl)
157{
158 return;
159}
160
161static inline int evm_inode_init_security(struct inode *inode, struct inode *dir,
162 const struct qstr *qstr,
163 struct xattr *xattrs,
164 int *xattr_count)
165{
166 return 0;
167}
168
169static inline bool evm_revalidate_status(const char *xattr_name)
170{
171 return false;
172}
173
174static inline int evm_protected_xattr_if_enabled(const char *req_xattr_name)
175{
176 return false;
177}
178
179static inline int evm_read_protected_xattrs(struct dentry *dentry, u8 *buffer,
180 int buffer_size, char type,
181 bool canonical_fmt)
182{
183 return -EOPNOTSUPP;
184}
185
186#endif /* CONFIG_EVM */
187#endif /* LINUX_EVM_H */