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Mimi Zohar3323eec92009-02-04 09:06:58 -05001/*
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
Mimi Zoharf381c272011-03-09 14:13:22 -050027#include "../integrity.h"
28
Mimi Zohar3323eec92009-02-04 09:06:58 -050029enum 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 */
Mimi Zoharf381c272011-03-09 14:13:22 -050033#define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE
Mimi Zohar3323eec92009-02-04 09:06:58 -050034#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;
Mimi Zohar2fe5d6d2012-02-13 10:15:05 -050043extern int ima_appraise;
Mimi Zohar3323eec92009-02-04 09:06:58 -050044
45/* IMA inode template definition */
46struct ima_template_data {
47 u8 digest[IMA_DIGEST_SIZE]; /* sha1/md5 measurement hash */
48 char file_name[IMA_EVENT_NAME_LEN_MAX + 1]; /* name + \0 */
49};
50
51struct ima_template_entry {
52 u8 digest[IMA_DIGEST_SIZE]; /* sha1 or md5 measurement hash */
Mimi Zohar523979a2009-02-11 11:12:28 -050053 const char *template_name;
Mimi Zohar3323eec92009-02-04 09:06:58 -050054 int template_len;
55 struct ima_template_data template;
56};
57
58struct ima_queue_entry {
59 struct hlist_node hnext; /* place in hash collision list */
60 struct list_head later; /* place in ima_measurements list */
61 struct ima_template_entry *entry;
62};
63extern struct list_head ima_measurements; /* list of all measurements */
64
Dmitry Kasatkin417c6c82012-06-25 12:18:21 +030065#ifdef CONFIG_IMA_AUDIT
Mimi Zohar3323eec92009-02-04 09:06:58 -050066/* declarations */
67void integrity_audit_msg(int audit_msgno, struct inode *inode,
68 const unsigned char *fname, const char *op,
69 const char *cause, int result, int info);
Dmitry Kasatkin417c6c82012-06-25 12:18:21 +030070#else
71static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
72 const unsigned char *fname,
73 const char *op, const char *cause,
74 int result, int info)
75{
76}
77#endif
Mimi Zohar3323eec92009-02-04 09:06:58 -050078
79/* Internal IMA function definitions */
Mimi Zohar3323eec92009-02-04 09:06:58 -050080int ima_init(void);
Mimi Zoharbab73932009-02-04 09:06:59 -050081void ima_cleanup(void);
82int ima_fs_init(void);
83void ima_fs_cleanup(void);
Eric Parisa178d202010-10-25 14:41:59 -040084int ima_inode_alloc(struct inode *inode);
Mimi Zohar3323eec92009-02-04 09:06:58 -050085int ima_add_template_entry(struct ima_template_entry *entry, int violation,
86 const char *op, struct inode *inode);
87int ima_calc_hash(struct file *file, char *digest);
88int ima_calc_template_hash(int template_len, void *template, char *digest);
89int ima_calc_boot_aggregate(char *digest);
90void ima_add_violation(struct inode *inode, const unsigned char *filename,
91 const char *op, const char *cause);
92
93/*
94 * used to protect h_table and sha_table
95 */
96extern spinlock_t ima_queue_lock;
97
98struct ima_h_table {
99 atomic_long_t len; /* number of stored measurements in the list */
100 atomic_long_t violations;
101 struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
102};
103extern struct ima_h_table ima_htable;
104
105static inline unsigned long ima_hash_key(u8 *digest)
106{
107 return hash_long(*digest, IMA_HASH_BITS);
108}
109
Mimi Zohar3323eec92009-02-04 09:06:58 -0500110/* LIM API function definitions */
Dmitry Kasatkind9d300c2012-06-27 11:26:14 +0300111int ima_get_action(struct inode *inode, int mask, int function);
Mimi Zohar1adace92011-02-22 10:19:43 -0500112int ima_must_measure(struct inode *inode, int mask, int function);
Mimi Zoharf381c272011-03-09 14:13:22 -0500113int ima_collect_measurement(struct integrity_iint_cache *iint,
114 struct file *file);
115void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
Mimi Zohar3323eec92009-02-04 09:06:58 -0500116 const unsigned char *filename);
Peter Moodye7c568e2012-06-14 10:04:36 -0700117void ima_audit_measurement(struct integrity_iint_cache *iint,
118 const unsigned char *filename);
Mimi Zohar3323eec92009-02-04 09:06:58 -0500119int ima_store_template(struct ima_template_entry *entry, int violation,
120 struct inode *inode);
Mimi Zoharf381c272011-03-09 14:13:22 -0500121void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show);
Mimi Zohar3323eec92009-02-04 09:06:58 -0500122
Eric Paris85491642010-10-25 14:41:18 -0400123/* rbtree tree calls to lookup, insert, delete
Mimi Zohar3323eec92009-02-04 09:06:58 -0500124 * integrity data associated with an inode.
125 */
Mimi Zoharf381c272011-03-09 14:13:22 -0500126struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
127struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
Mimi Zohar3323eec92009-02-04 09:06:58 -0500128
129/* IMA policy related functions */
Mimi Zohar2fe5d6d2012-02-13 10:15:05 -0500130enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK, POST_SETATTR };
Mimi Zohar3323eec92009-02-04 09:06:58 -0500131
Mimi Zohar2fe5d6d2012-02-13 10:15:05 -0500132int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask,
133 int flags);
Mimi Zohar3323eec92009-02-04 09:06:58 -0500134void ima_init_policy(void);
135void ima_update_policy(void);
Eric Paris6ccd0452010-04-20 10:20:54 -0400136ssize_t ima_parse_add_rule(char *);
Mimi Zohar4af46622009-02-04 09:07:00 -0500137void ima_delete_rules(void);
138
Mimi Zohar2fe5d6d2012-02-13 10:15:05 -0500139/* Appraise integrity measurements */
140#define IMA_APPRAISE_ENFORCE 0x01
141#define IMA_APPRAISE_FIX 0x02
142
143#ifdef CONFIG_IMA_APPRAISE
144int ima_appraise_measurement(struct integrity_iint_cache *iint,
145 struct file *file, const unsigned char *filename);
146int ima_must_appraise(struct inode *inode, enum ima_hooks func, int mask);
147void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
148
149#else
150static inline int ima_appraise_measurement(struct integrity_iint_cache *iint,
151 struct file *file,
152 const unsigned char *filename)
153{
154 return INTEGRITY_UNKNOWN;
155}
156
157static inline int ima_must_appraise(struct inode *inode,
158 enum ima_hooks func, int mask)
159{
160 return 0;
161}
162
163static inline void ima_update_xattr(struct integrity_iint_cache *iint,
164 struct file *file)
165{
166}
167#endif
168
Mimi Zohar4af46622009-02-04 09:07:00 -0500169/* LSM based policy rules require audit */
170#ifdef CONFIG_IMA_LSM_RULES
171
172#define security_filter_rule_init security_audit_rule_init
173#define security_filter_rule_match security_audit_rule_match
174
175#else
176
177static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
178 void **lsmrule)
179{
180 return -EINVAL;
181}
182
183static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
184 void *lsmrule,
185 struct audit_context *actx)
186{
187 return -EINVAL;
188}
189#endif /* CONFIG_IMA_LSM_RULES */
Mimi Zohar3323eec92009-02-04 09:06:58 -0500190#endif