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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
27enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII };
28enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 };
29
30/* digest size for IMA, fits SHA1 or MD5 */
31#define IMA_DIGEST_SIZE 20
32#define IMA_EVENT_NAME_LEN_MAX 255
33
34#define IMA_HASH_BITS 9
35#define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
36
37/* set during initialization */
38extern int ima_initialized;
39extern int ima_used_chip;
40extern char *ima_hash;
41
42/* IMA inode template definition */
43struct 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 */
46};
47
48struct ima_template_entry {
49 u8 digest[IMA_DIGEST_SIZE]; /* sha1 or md5 measurement hash */
Mimi Zohar523979a2009-02-11 11:12:28 -050050 const char *template_name;
Mimi Zohar3323eec92009-02-04 09:06:58 -050051 int template_len;
52 struct ima_template_data template;
53};
54
55struct 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;
59};
60extern struct list_head ima_measurements; /* list of all measurements */
61
62/* declarations */
63void 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);
66
67/* Internal IMA function definitions */
Mimi Zohar3323eec92009-02-04 09:06:58 -050068int ima_init(void);
Mimi Zoharbab73932009-02-04 09:06:59 -050069void ima_cleanup(void);
70int ima_fs_init(void);
71void ima_fs_cleanup(void);
Mimi Zohar3323eec92009-02-04 09:06:58 -050072int ima_add_template_entry(struct ima_template_entry *entry, int violation,
73 const char *op, struct inode *inode);
74int ima_calc_hash(struct file *file, char *digest);
75int ima_calc_template_hash(int template_len, void *template, char *digest);
76int ima_calc_boot_aggregate(char *digest);
77void ima_add_violation(struct inode *inode, const unsigned char *filename,
78 const char *op, const char *cause);
79
80/*
81 * used to protect h_table and sha_table
82 */
83extern spinlock_t ima_queue_lock;
84
85struct ima_h_table {
86 atomic_long_t len; /* number of stored measurements in the list */
87 atomic_long_t violations;
88 struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
89};
90extern struct ima_h_table ima_htable;
91
92static inline unsigned long ima_hash_key(u8 *digest)
93{
94 return hash_long(*digest, IMA_HASH_BITS);
95}
96
97/* iint cache flags */
98#define IMA_MEASURED 1
99
100/* integrity data associated with an inode */
101struct ima_iint_cache {
102 u64 version; /* track inode changes */
103 unsigned long flags;
104 u8 digest[IMA_DIGEST_SIZE];
105 struct mutex mutex; /* protects: version, flags, digest */
106 long readcount; /* measured files readcount */
107 long writecount; /* measured files writecount */
Mimi Zohar1df9f0a2009-02-04 09:07:02 -0500108 long opencount; /* opens reference count */
Mimi Zohar3323eec92009-02-04 09:06:58 -0500109 struct kref refcount; /* ima_iint_cache reference count */
110 struct rcu_head rcu;
111};
112
113/* LIM API function definitions */
114int ima_must_measure(struct ima_iint_cache *iint, struct inode *inode,
115 int mask, int function);
116int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file);
117void ima_store_measurement(struct ima_iint_cache *iint, struct file *file,
118 const unsigned char *filename);
119int ima_store_template(struct ima_template_entry *entry, int violation,
120 struct inode *inode);
Mimi Zoharbab73932009-02-04 09:06:59 -0500121void ima_template_show(struct seq_file *m, void *e,
122 enum ima_show_type show);
Mimi Zohar3323eec92009-02-04 09:06:58 -0500123
124/* radix tree calls to lookup, insert, delete
125 * integrity data associated with an inode.
126 */
127struct ima_iint_cache *ima_iint_insert(struct inode *inode);
128struct ima_iint_cache *ima_iint_find_get(struct inode *inode);
Mimi Zohar3323eec92009-02-04 09:06:58 -0500129void iint_free(struct kref *kref);
130void iint_rcu_free(struct rcu_head *rcu);
131
132/* IMA policy related functions */
Mimi Zohar1e93d002010-01-26 17:02:41 -0500133enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK };
Mimi Zohar3323eec92009-02-04 09:06:58 -0500134
135int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask);
136void ima_init_policy(void);
137void ima_update_policy(void);
Eric Paris6ccd0452010-04-20 10:20:54 -0400138ssize_t ima_parse_add_rule(char *);
Mimi Zohar4af46622009-02-04 09:07:00 -0500139void ima_delete_rules(void);
140
141/* LSM based policy rules require audit */
142#ifdef CONFIG_IMA_LSM_RULES
143
144#define security_filter_rule_init security_audit_rule_init
145#define security_filter_rule_match security_audit_rule_match
146
147#else
148
149static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
150 void **lsmrule)
151{
152 return -EINVAL;
153}
154
155static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
156 void *lsmrule,
157 struct audit_context *actx)
158{
159 return -EINVAL;
160}
161#endif /* CONFIG_IMA_LSM_RULES */
Mimi Zohar3323eec92009-02-04 09:06:58 -0500162#endif