xref: /openbmc/linux/security/integrity/evm/evm.h (revision 10c1d542c7e871865bca381842fd04a92d2b95ec)
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