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 ima_initialized;
  41 extern int ima_used_chip;
  42 extern char *ima_hash;
  43
  44 /* IMA inode template definition */
  45 struct 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
  50 struct 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
  57 struct 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 };
  62 extern struct list_head ima_measurements;       /* list of all measurements */
  63
  64 /* declarations */
  65 void 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 */
  70 int ima_init(void);
  71 void ima_cleanup(void);
  72 int ima_fs_init(void);
  73 void ima_fs_cleanup(void);
  74 int ima_inode_alloc(struct inode *inode);
  75 int ima_add_template_entry(struct ima_template_entry *entry, int violation,
  76                            const char *op, struct inode *inode);
  77 int ima_calc_hash(struct file *file, char *digest);
  78 int ima_calc_template_hash(int template_len, void *template, char *digest);
  79 int ima_calc_boot_aggregate(char *digest);
  80 void 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  */
  86 extern spinlock_t ima_queue_lock;
  87
  88 struct 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 };
  93 extern struct ima_h_table ima_htable;
  94
  95 static inline unsigned long ima_hash_key(u8 *digest)
  96 {
  97         return hash_long(*digest, IMA_HASH_BITS);
  98 }
  99
 100 /* LIM API function definitions */
 101 int ima_must_measure(struct inode *inode, int mask, int function);
 102 int ima_collect_measurement(struct integrity_iint_cache *iint,
 103                             struct file *file);
 104 void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
 105                            const unsigned char *filename);
 106 int ima_store_template(struct ima_template_entry *entry, int violation,
 107                        struct inode *inode);
 108 void 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  */
 113 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
 114 struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
 115
 116 /* IMA policy related functions */
 117 enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK };
 118
 119 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask);
 120 void ima_init_policy(void);
 121 void ima_update_policy(void);
 122 ssize_t ima_parse_add_rule(char *);
 123 void 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
 133 static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
 134                                             void **lsmrule)
 135 {
 136         return -EINVAL;
 137 }
 138
 139 static 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