LXR linux/security/integrity/ima/ima.h

   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/* declarations */
  65void integrity_audit_msg(int audit_msgno, struct inode *inode,
  66                         const unsigned char *fname, const char *op,
  67                         const char *cause, int result, int info);
  68
  69/* Internal IMA function definitions */
  70int ima_init(void);
  71void ima_cleanup(void);
  72int ima_fs_init(void);
  73void ima_fs_cleanup(void);
  74int ima_inode_alloc(struct inode *inode);
  75int ima_add_template_entry(struct ima_template_entry *entry, int violation,
  76                           const char *op, struct inode *inode);
  77int ima_calc_hash(struct file *file, char *digest);
  78int ima_calc_template_hash(int template_len, void *template, char *digest);
  79int ima_calc_boot_aggregate(char *digest);
  80void ima_add_violation(struct inode *inode, const unsigned char *filename,
  81                       const char *op, const char *cause);
  82
  83/*
  84 * used to protect h_table and sha_table
  85 */
  86extern spinlock_t ima_queue_lock;
  87
  88struct ima_h_table {
  89        atomic_long_t len;      /* number of stored measurements in the list */
  90        atomic_long_t violations;
  91        struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
  92};
  93extern struct ima_h_table ima_htable;
  94
  95static inline unsigned long ima_hash_key(u8 *digest)
  96{
  97        return hash_long(*digest, IMA_HASH_BITS);
  98}
  99
 100/* LIM API function definitions */
 101int ima_must_measure(struct inode *inode, int mask, int function);
 102int ima_collect_measurement(struct integrity_iint_cache *iint,
 103                            struct file *file);
 104void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
 105                           const unsigned char *filename);
 106int ima_store_template(struct ima_template_entry *entry, int violation,
 107                       struct inode *inode);
 108void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show);
 109
 110/* rbtree tree calls to lookup, insert, delete
 111 * integrity data associated with an inode.
 112 */
 113struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
 114struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
 115
 116/* IMA policy related functions */
 117enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK };
 118
 119int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask);
 120void ima_init_policy(void);
 121void ima_update_policy(void);
 122ssize_t ima_parse_add_rule(char *);
 123void ima_delete_rules(void);
 124
 125/* LSM based policy rules require audit */
 126#ifdef CONFIG_IMA_LSM_RULES
 127
 128#define security_filter_rule_init security_audit_rule_init
 129#define security_filter_rule_match security_audit_rule_match
 130
 131#else
 132
 133static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
 134                                            void **lsmrule)
 135{
 136        return -EINVAL;
 137}
 138
 139static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
 140                                             void *lsmrule,
 141                                             struct audit_context *actx)
 142{
 143        return -EINVAL;
 144}
 145#endif /* CONFIG_IMA_LSM_RULES */
 146#endif
 147