include/linux/evm.h

   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
  15 struct integrity_iint_cache;
  16
  17 #ifdef CONFIG_EVM
  18 extern int evm_set_key(void *key, size_t keylen);
  19 extern 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);
  24 extern int evm_inode_setattr(struct mnt_idmap *idmap,
  25                              struct dentry *dentry, struct iattr *attr);
  26 extern void evm_inode_post_setattr(struct dentry *dentry, int ia_valid);
  27 extern int evm_inode_setxattr(struct mnt_idmap *idmap,
  28                               struct dentry *dentry, const char *name,
  29                               const void *value, size_t size);
  30 extern void evm_inode_post_setxattr(struct dentry *dentry,
  31                                     const char *xattr_name,
  32                                     const void *xattr_value,
  33                                     size_t xattr_value_len);
  34 extern int evm_inode_removexattr(struct mnt_idmap *idmap,
  35                                  struct dentry *dentry, const char *xattr_name);
  36 extern void evm_inode_post_removexattr(struct dentry *dentry,
  37                                        const char *xattr_name);
  38 static 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 }
  44 extern int evm_inode_set_acl(struct mnt_idmap *idmap,
  45                              struct dentry *dentry, const char *acl_name,
  46                              struct posix_acl *kacl);
  47 static 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 }
  53 static 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 extern int evm_inode_init_security(struct inode *inode,
  60                                    const struct xattr *xattr_array,
  61                                    struct xattr *evm);
  62 extern bool evm_revalidate_status(const char *xattr_name);
  63 extern int evm_protected_xattr_if_enabled(const char *req_xattr_name);
  64 extern int evm_read_protected_xattrs(struct dentry *dentry, u8 *buffer,
  65                                      int buffer_size, char type,
  66                                      bool canonical_fmt);
  67 #ifdef CONFIG_FS_POSIX_ACL
  68 extern int posix_xattr_acl(const char *xattrname);
  69 #else
  70 static inline int posix_xattr_acl(const char *xattrname)
  71 {
  72         return 0;
  73 }
  74 #endif
  75 #else
  76
  77 static inline int evm_set_key(void *key, size_t keylen)
  78 {
  79         return -EOPNOTSUPP;
  80 }
  81
  82 #ifdef CONFIG_INTEGRITY
  83 static inline enum integrity_status evm_verifyxattr(struct dentry *dentry,
  84                                                     const char *xattr_name,
  85                                                     void *xattr_value,
  86                                                     size_t xattr_value_len,
  87                                         struct integrity_iint_cache *iint)
  88 {
  89         return INTEGRITY_UNKNOWN;
  90 }
  91 #endif
  92
  93 static inline int evm_inode_setattr(struct mnt_idmap *idmap,
  94                                     struct dentry *dentry, struct iattr *attr)
  95 {
  96         return 0;
  97 }
  98
  99 static inline void evm_inode_post_setattr(struct dentry *dentry, int ia_valid)
 100 {
 101         return;
 102 }
 103
 104 static inline int evm_inode_setxattr(struct mnt_idmap *idmap,
 105                                      struct dentry *dentry, const char *name,
 106                                      const void *value, size_t size)
 107 {
 108         return 0;
 109 }
 110
 111 static inline void evm_inode_post_setxattr(struct dentry *dentry,
 112                                            const char *xattr_name,
 113                                            const void *xattr_value,
 114                                            size_t xattr_value_len)
 115 {
 116         return;
 117 }
 118
 119 static inline int evm_inode_removexattr(struct mnt_idmap *idmap,
 120                                         struct dentry *dentry,
 121                                         const char *xattr_name)
 122 {
 123         return 0;
 124 }
 125
 126 static inline void evm_inode_post_removexattr(struct dentry *dentry,
 127                                               const char *xattr_name)
 128 {
 129         return;
 130 }
 131
 132 static inline void evm_inode_post_remove_acl(struct mnt_idmap *idmap,
 133                                              struct dentry *dentry,
 134                                              const char *acl_name)
 135 {
 136         return;
 137 }
 138
 139 static inline int evm_inode_set_acl(struct mnt_idmap *idmap,
 140                                     struct dentry *dentry, const char *acl_name,
 141                                     struct posix_acl *kacl)
 142 {
 143         return 0;
 144 }
 145
 146 static inline int evm_inode_remove_acl(struct mnt_idmap *idmap,
 147                                        struct dentry *dentry,
 148                                        const char *acl_name)
 149 {
 150         return 0;
 151 }
 152
 153 static inline void evm_inode_post_set_acl(struct dentry *dentry,
 154                                           const char *acl_name,
 155                                           struct posix_acl *kacl)
 156 {
 157         return;
 158 }
 159
 160 static inline int evm_inode_init_security(struct inode *inode,
 161                                           const struct xattr *xattr_array,
 162                                           struct xattr *evm)
 163 {
 164         return 0;
 165 }
 166
 167 static inline bool evm_revalidate_status(const char *xattr_name)
 168 {
 169         return false;
 170 }
 171
 172 static inline int evm_protected_xattr_if_enabled(const char *req_xattr_name)
 173 {
 174         return false;
 175 }
 176
 177 static inline int evm_read_protected_xattrs(struct dentry *dentry, u8 *buffer,
 178                                             int buffer_size, char type,
 179                                             bool canonical_fmt)
 180 {
 181         return -EOPNOTSUPP;
 182 }
 183
 184 #endif /* CONFIG_EVM */
 185 #endif /* LINUX_EVM_H */