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1/*
2 * Copyright (C) 2005,2006,2007,2008 IBM Corporation
3 *
4 * Authors:
5 * Reiner Sailer <sailer@watson.ibm.com>
6 * Mimi Zohar <zohar@us.ibm.com>
7 *
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
11 * License.
12 *
13 * File: ima.h
14 * internal Integrity Measurement Architecture (IMA) definitions
15 */
16
17#ifndef __LINUX_IMA_H
18#define __LINUX_IMA_H
19
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>
26
27#include "../integrity.h"
28
29enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII };
30enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 };
31
32/* digest size for IMA, fits SHA1 or MD5 */
33#define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE
34#define IMA_EVENT_NAME_LEN_MAX 255
35
36#define IMA_HASH_BITS 9
37#define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
38
39/* set during initialization */
40extern int ima_initialized;
41extern int ima_used_chip;
42extern char *ima_hash;
43
44/* IMA inode template definition */
45struct ima_template_data {
46 u8 digest[IMA_DIGEST_SIZE]; /* sha1/md5 measurement hash */
47 char file_name[IMA_EVENT_NAME_LEN_MAX + 1]; /* name + \0 */
48};
49
50struct ima_template_entry {
51 u8 digest[IMA_DIGEST_SIZE]; /* sha1 or md5 measurement hash */
52 const char *template_name;
53 int template_len;
54 struct ima_template_data template;
55};
56
57struct ima_queue_entry {
58 struct hlist_node hnext; /* place in hash collision list */
59 struct list_head later; /* place in ima_measurements list */
60 struct ima_template_entry *entry;
61};
62extern struct list_head ima_measurements; /* list of all measurements */
63
64#ifdef CONFIG_IMA_AUDIT
65/* declarations */
66void integrity_audit_msg(int audit_msgno, struct inode *inode,
67 const unsigned char *fname, const char *op,
68 const char *cause, int result, int info);
69#else
70static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
71 const unsigned char *fname,
72 const char *op, const char *cause,
73 int result, int info)
74{
75}
76#endif
77
78/* Internal IMA function definitions */
79int ima_init(void);
80void ima_cleanup(void);
81int ima_fs_init(void);
82void ima_fs_cleanup(void);
83int ima_inode_alloc(struct inode *inode);
84int ima_add_template_entry(struct ima_template_entry *entry, int violation,
85 const char *op, struct inode *inode);
86int ima_calc_hash(struct file *file, char *digest);
87int ima_calc_template_hash(int template_len, void *template, char *digest);
88int ima_calc_boot_aggregate(char *digest);
89void ima_add_violation(struct inode *inode, const unsigned char *filename,
90 const char *op, const char *cause);
91
92/*
93 * used to protect h_table and sha_table
94 */
95extern spinlock_t ima_queue_lock;
96
97struct ima_h_table {
98 atomic_long_t len; /* number of stored measurements in the list */
99 atomic_long_t violations;
100 struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
101};
102extern struct ima_h_table ima_htable;
103
104static inline unsigned long ima_hash_key(u8 *digest)
105{
106 return hash_long(*digest, IMA_HASH_BITS);
107}
108
109/* LIM API function definitions */
110int ima_must_measure(struct inode *inode, int mask, int function);
111int ima_collect_measurement(struct integrity_iint_cache *iint,
112 struct file *file);
113void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
114 const unsigned char *filename);
115int ima_store_template(struct ima_template_entry *entry, int violation,
116 struct inode *inode);
117void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show);
118
119/* rbtree tree calls to lookup, insert, delete
120 * integrity data associated with an inode.
121 */
122struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
123struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
124
125/* IMA policy related functions */
126enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK };
127
128int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask);
129void ima_init_policy(void);
130void ima_update_policy(void);
131ssize_t ima_parse_add_rule(char *);
132void ima_delete_rules(void);
133
134/* LSM based policy rules require audit */
135#ifdef CONFIG_IMA_LSM_RULES
136
137#define security_filter_rule_init security_audit_rule_init
138#define security_filter_rule_match security_audit_rule_match
139
140#else
141
142static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
143 void **lsmrule)
144{
145 return -EINVAL;
146}
147
148static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
149 void *lsmrule,
150 struct audit_context *actx)
151{
152 return -EINVAL;
153}
154#endif /* CONFIG_IMA_LSM_RULES */
155#endif