security/integrity/evm/evm.h

   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 };
  33
  34 extern int evm_initialized;
  35
  36 #define EVM_ATTR_FSUUID         0x0001
  37
  38 extern int evm_hmac_attrs;
  39
  40 extern struct crypto_shash *hmac_tfm;
  41 extern struct crypto_shash *hash_tfm;
  42
  43 /* List of EVM protected security xattrs */
  44 extern struct list_head evm_config_xattrnames;
  45
  46 struct evm_digest {
  47         struct ima_digest_data hdr;
  48         char digest[IMA_MAX_DIGEST_SIZE];
  49 } __packed;
  50
  51 int evm_init_key(void);
  52 int evm_update_evmxattr(struct dentry *dentry,
  53                         const char *req_xattr_name,
  54                         const char *req_xattr_value,
  55                         size_t req_xattr_value_len);
  56 int evm_calc_hmac(struct dentry *dentry, const char *req_xattr_name,
  57                   const char *req_xattr_value,
  58                   size_t req_xattr_value_len, struct evm_digest *data);
  59 int evm_calc_hash(struct dentry *dentry, const char *req_xattr_name,
  60                   const char *req_xattr_value,
  61                   size_t req_xattr_value_len, char type,
  62                   struct evm_digest *data);
  63 int evm_init_hmac(struct inode *inode, const struct xattr *xattr,
  64                   char *hmac_val);
  65 int evm_init_secfs(void);
  66
  67 #endif