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
  29 enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII };
  30 enum 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 */
  40 extern int iint_initialized;
  41 extern int ima_initialized;
  42 extern int ima_used_chip;
  43 extern char *ima_hash;
  44
  45 /* IMA inode template definition */
  46 struct 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
  51 struct ima_template_entry {
  52         u8 digest[IMA_DIGEST_SIZE];     /* sha1 or md5 measurement hash */
  53         const char *template_name;
  54         int template_len;
  55         struct ima_template_data template;
  56 };
  57
  58 struct 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 };
  63 extern struct list_head ima_measurements;       /* list of all measurements */
  64
  65 /* declarations */
  66 void 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
  70 /* Internal IMA function definitions */
  71 int ima_init(void);
  72 void ima_cleanup(void);
  73 int ima_fs_init(void);
  74 void ima_fs_cleanup(void);
  75 int ima_inode_alloc(struct inode *inode);
  76 int ima_add_template_entry(struct ima_template_entry *entry, int violation,
  77                            const char *op, struct inode *inode);
  78 int ima_calc_hash(struct file *file, char *digest);
  79 int ima_calc_template_hash(int template_len, void *template, char *digest);
  80 int ima_calc_boot_aggregate(char *digest);
  81 void ima_add_violation(struct inode *inode, const unsigned char *filename,
  82                        const char *op, const char *cause);
  83
  84 /*
  85  * used to protect h_table and sha_table
  86  */
  87 extern spinlock_t ima_queue_lock;
  88
  89 struct ima_h_table {
  90         atomic_long_t len;      /* number of stored measurements in the list */
  91         atomic_long_t violations;
  92         struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
  93 };
  94 extern struct ima_h_table ima_htable;
  95
  96 static inline unsigned long ima_hash_key(u8 *digest)
  97 {
  98         return hash_long(*digest, IMA_HASH_BITS);
  99 }
 100
 101 /* LIM API function definitions */
 102 int ima_must_measure(struct inode *inode, int mask, int function);
 103 int ima_collect_measurement(struct integrity_iint_cache *iint,
 104                             struct file *file);
 105 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
 106                            const unsigned char *filename);
 107 int ima_store_template(struct ima_template_entry *entry, int violation,
 108                        struct inode *inode);
 109 void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show);
 110
 111 /* rbtree tree calls to lookup, insert, delete
 112  * integrity data associated with an inode.
 113  */
 114 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
 115 struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
 116
 117 /* IMA policy related functions */
 118 enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK };
 119
 120 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask);
 121 void ima_init_policy(void);
 122 void ima_update_policy(void);
 123 ssize_t ima_parse_add_rule(char *);
 124 void ima_delete_rules(void);
 125
 126 /* LSM based policy rules require audit */
 127 #ifdef CONFIG_IMA_LSM_RULES
 128
 129 #define security_filter_rule_init security_audit_rule_init
 130 #define security_filter_rule_match security_audit_rule_match
 131
 132 #else
 133
 134 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
 135                                             void **lsmrule)
 136 {
 137         return -EINVAL;
 138 }
 139
 140 static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
 141                                              void *lsmrule,
 142                                              struct audit_context *actx)
 143 {
 144         return -EINVAL;
 145 }
 146 #endif /* CONFIG_IMA_LSM_RULES */
 147 #endif