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