Mimi Zohar | 3323eec9 | 2009-02-04 09:06:58 -0500 | [diff] [blame] | 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 | enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII }; |
| 28 | enum 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 */ |
| 38 | extern int ima_initialized; |
| 39 | extern int ima_used_chip; |
| 40 | extern char *ima_hash; |
| 41 | |
| 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 */ |
| 46 | }; |
| 47 | |
| 48 | struct ima_template_entry { |
| 49 | u8 digest[IMA_DIGEST_SIZE]; /* sha1 or md5 measurement hash */ |
Mimi Zohar | 523979a | 2009-02-11 11:12:28 -0500 | [diff] [blame] | 50 | const char *template_name; |
Mimi Zohar | 3323eec9 | 2009-02-04 09:06:58 -0500 | [diff] [blame] | 51 | int template_len; |
| 52 | struct ima_template_data template; |
| 53 | }; |
| 54 | |
| 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; |
| 59 | }; |
| 60 | extern struct list_head ima_measurements; /* list of all measurements */ |
| 61 | |
| 62 | /* declarations */ |
| 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); |
| 66 | |
| 67 | /* Internal IMA function definitions */ |
Mimi Zohar | 3323eec9 | 2009-02-04 09:06:58 -0500 | [diff] [blame] | 68 | int ima_init(void); |
Mimi Zohar | bab7393 | 2009-02-04 09:06:59 -0500 | [diff] [blame] | 69 | void ima_cleanup(void); |
| 70 | int ima_fs_init(void); |
| 71 | void ima_fs_cleanup(void); |
Mimi Zohar | 3323eec9 | 2009-02-04 09:06:58 -0500 | [diff] [blame] | 72 | int ima_add_template_entry(struct ima_template_entry *entry, int violation, |
| 73 | const char *op, struct inode *inode); |
| 74 | int ima_calc_hash(struct file *file, char *digest); |
| 75 | int ima_calc_template_hash(int template_len, void *template, char *digest); |
| 76 | int ima_calc_boot_aggregate(char *digest); |
| 77 | void 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 | */ |
| 83 | extern spinlock_t ima_queue_lock; |
| 84 | |
| 85 | struct 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 | }; |
| 90 | extern struct ima_h_table ima_htable; |
| 91 | |
| 92 | static 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 */ |
| 101 | struct 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 Zohar | 1df9f0a | 2009-02-04 09:07:02 -0500 | [diff] [blame] | 108 | long opencount; /* opens reference count */ |
Mimi Zohar | 3323eec9 | 2009-02-04 09:06:58 -0500 | [diff] [blame] | 109 | struct kref refcount; /* ima_iint_cache reference count */ |
| 110 | struct rcu_head rcu; |
| 111 | }; |
| 112 | |
| 113 | /* LIM API function definitions */ |
| 114 | int ima_must_measure(struct ima_iint_cache *iint, struct inode *inode, |
| 115 | int mask, int function); |
| 116 | int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file); |
| 117 | void ima_store_measurement(struct ima_iint_cache *iint, struct file *file, |
| 118 | const unsigned char *filename); |
| 119 | int ima_store_template(struct ima_template_entry *entry, int violation, |
| 120 | struct inode *inode); |
Mimi Zohar | bab7393 | 2009-02-04 09:06:59 -0500 | [diff] [blame] | 121 | void ima_template_show(struct seq_file *m, void *e, |
| 122 | enum ima_show_type show); |
Mimi Zohar | 3323eec9 | 2009-02-04 09:06:58 -0500 | [diff] [blame] | 123 | |
| 124 | /* radix tree calls to lookup, insert, delete |
| 125 | * integrity data associated with an inode. |
| 126 | */ |
| 127 | struct ima_iint_cache *ima_iint_insert(struct inode *inode); |
| 128 | struct ima_iint_cache *ima_iint_find_get(struct inode *inode); |
Mimi Zohar | 3323eec9 | 2009-02-04 09:06:58 -0500 | [diff] [blame] | 129 | void iint_free(struct kref *kref); |
| 130 | void iint_rcu_free(struct rcu_head *rcu); |
| 131 | |
| 132 | /* IMA policy related functions */ |
Mimi Zohar | 1e93d00 | 2010-01-26 17:02:41 -0500 | [diff] [blame] | 133 | enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK }; |
Mimi Zohar | 3323eec9 | 2009-02-04 09:06:58 -0500 | [diff] [blame] | 134 | |
| 135 | int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask); |
| 136 | void ima_init_policy(void); |
| 137 | void ima_update_policy(void); |
Eric Paris | 6ccd045 | 2010-04-20 10:20:54 -0400 | [diff] [blame^] | 138 | ssize_t ima_parse_add_rule(char *); |
Mimi Zohar | 4af4662 | 2009-02-04 09:07:00 -0500 | [diff] [blame] | 139 | void 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 | |
| 149 | static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, |
| 150 | void **lsmrule) |
| 151 | { |
| 152 | return -EINVAL; |
| 153 | } |
| 154 | |
| 155 | static 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 Zohar | 3323eec9 | 2009-02-04 09:06:58 -0500 | [diff] [blame] | 162 | #endif |