2 * Copyright (C) 2005,2006,2007,2008 IBM Corporation
5 * Reiner Sailer <sailer@watson.ibm.com>
6 * Mimi Zohar <zohar@us.ibm.com>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation, version 2 of the
14 * internal Integrity Measurement Architecture (IMA) definitions
20 #include <linux/types.h>
21 #include <linux/crypto.h>
22 #include <linux/security.h>
23 #include <linux/hash.h>
24 #include <linux/tpm.h>
25 #include <linux/audit.h>
27 enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII };
28 enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 };
30 /* digest size for IMA, fits SHA1 or MD5 */
31 #define IMA_DIGEST_SIZE 20
32 #define IMA_EVENT_NAME_LEN_MAX 255
34 #define IMA_HASH_BITS 9
35 #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
37 /* set during initialization */
38 extern int ima_initialized;
39 extern int ima_used_chip;
40 extern char *ima_hash;
42 /* IMA inode template definition */
43 struct ima_template_data {
44 u8 digest[IMA_DIGEST_SIZE]; /* sha1/md5 measurement hash */
45 char file_name[IMA_EVENT_NAME_LEN_MAX + 1]; /* name + \0 */
48 struct ima_template_entry {
49 u8 digest[IMA_DIGEST_SIZE]; /* sha1 or md5 measurement hash */
52 struct ima_template_data template;
55 struct ima_queue_entry {
56 struct hlist_node hnext; /* place in hash collision list */
57 struct list_head later; /* place in ima_measurements list */
58 struct ima_template_entry *entry;
60 extern struct list_head ima_measurements; /* list of all measurements */
63 void integrity_audit_msg(int audit_msgno, struct inode *inode,
64 const unsigned char *fname, const char *op,
65 const char *cause, int result, int info);
67 /* Internal IMA function definitions */
68 void ima_iintcache_init(void);
70 int ima_add_template_entry(struct ima_template_entry *entry, int violation,
71 const char *op, struct inode *inode);
72 int ima_calc_hash(struct file *file, char *digest);
73 int ima_calc_template_hash(int template_len, void *template, char *digest);
74 int ima_calc_boot_aggregate(char *digest);
75 void ima_add_violation(struct inode *inode, const unsigned char *filename,
76 const char *op, const char *cause);
79 * used to protect h_table and sha_table
81 extern spinlock_t ima_queue_lock;
84 atomic_long_t len; /* number of stored measurements in the list */
85 atomic_long_t violations;
86 struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
88 extern struct ima_h_table ima_htable;
90 static inline unsigned long ima_hash_key(u8 *digest)
92 return hash_long(*digest, IMA_HASH_BITS);
95 /* iint cache flags */
96 #define IMA_MEASURED 1
98 /* integrity data associated with an inode */
99 struct ima_iint_cache {
100 u64 version; /* track inode changes */
102 u8 digest[IMA_DIGEST_SIZE];
103 struct mutex mutex; /* protects: version, flags, digest */
104 long readcount; /* measured files readcount */
105 long writecount; /* measured files writecount */
106 struct kref refcount; /* ima_iint_cache reference count */
110 /* LIM API function definitions */
111 int ima_must_measure(struct ima_iint_cache *iint, struct inode *inode,
112 int mask, int function);
113 int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file);
114 void ima_store_measurement(struct ima_iint_cache *iint, struct file *file,
115 const unsigned char *filename);
116 int ima_store_template(struct ima_template_entry *entry, int violation,
117 struct inode *inode);
119 /* radix tree calls to lookup, insert, delete
120 * integrity data associated with an inode.
122 struct ima_iint_cache *ima_iint_insert(struct inode *inode);
123 struct ima_iint_cache *ima_iint_find_get(struct inode *inode);
124 struct ima_iint_cache *ima_iint_find_insert_get(struct inode *inode);
125 void ima_iint_delete(struct inode *inode);
126 void iint_free(struct kref *kref);
127 void iint_rcu_free(struct rcu_head *rcu);
129 /* IMA policy related functions */
130 enum ima_hooks { PATH_CHECK = 1, FILE_MMAP, BPRM_CHECK };
132 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask);
133 void ima_init_policy(void);
134 void ima_update_policy(void);