security/integrity/evm/evm.h

   1 /*
   2  * Copyright (C) 2005-2010 IBM Corporation
   3  *
   4  * Authors:
   5  * Mimi Zohar <zohar@us.ibm.com>
   6  * Kylene Hall <kjhall@us.ibm.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation, version 2 of the License.
  11  *
  12  * File: evm.h
  13  *
  14  */
  15
  16 #ifndef __INTEGRITY_EVM_H
  17 #define __INTEGRITY_EVM_H
  18
  19 #include <linux/xattr.h>
  20 #include <linux/security.h>
  21
  22 #include "../integrity.h"
  23
  24 #define EVM_INIT_HMAC   0x0001
  25 #define EVM_INIT_X509   0x0002
  26 #define EVM_ALLOW_METADATA_WRITES       0x0004
  27 #define EVM_SETUP_COMPLETE 0x80000000 /* userland has signaled key load */
  28
  29 #define EVM_KEY_MASK (EVM_INIT_HMAC | EVM_INIT_X509)
  30 #define EVM_INIT_MASK (EVM_INIT_HMAC | EVM_INIT_X509 | EVM_SETUP_COMPLETE | \
  31                        EVM_ALLOW_METADATA_WRITES)
  32
  33 struct xattr_list {
  34         struct list_head list;
  35         char *name;
  36 };
  37
  38 extern int evm_initialized;
  39
  40 #define EVM_ATTR_FSUUID         0x0001
  41
  42 extern int evm_hmac_attrs;
  43
  44 extern struct crypto_shash *hmac_tfm;
  45 extern struct crypto_shash *hash_tfm;
  46
  47 /* List of EVM protected security xattrs */
  48 extern struct list_head evm_config_xattrnames;
  49
  50 struct evm_digest {
  51         struct ima_digest_data hdr;
  52         char digest[IMA_MAX_DIGEST_SIZE];
  53 } __packed;
  54
  55 int evm_init_key(void);
  56 int evm_update_evmxattr(struct dentry *dentry,
  57                         const char *req_xattr_name,
  58                         const char *req_xattr_value,
  59                         size_t req_xattr_value_len);
  60 int evm_calc_hmac(struct dentry *dentry, const char *req_xattr_name,
  61                   const char *req_xattr_value,
  62                   size_t req_xattr_value_len, struct evm_digest *data);
  63 int evm_calc_hash(struct dentry *dentry, const char *req_xattr_name,
  64                   const char *req_xattr_value,
  65                   size_t req_xattr_value_len, char type,
  66                   struct evm_digest *data);
  67 int evm_init_hmac(struct inode *inode, const struct xattr *xattr,
  68                   char *hmac_val);
  69 int evm_init_secfs(void);
  70
  71 #endif