LXR linux/security/integrity/integrity.h

   1/*
   2 * Copyright (C) 2009-2010 IBM Corporation
   3 *
   4 * Authors:
   5 * Mimi Zohar <zohar@us.ibm.com>
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License as
   9 * published by the Free Software Foundation, version 2 of the
  10 * License.
  11 *
  12 */
  13
  14#include <linux/types.h>
  15#include <linux/integrity.h>
  16#include <crypto/sha.h>
  17#include <linux/key.h>
  18
  19/* iint action cache flags */
  20#define IMA_MEASURE             0x00000001
  21#define IMA_MEASURED            0x00000002
  22#define IMA_APPRAISE            0x00000004
  23#define IMA_APPRAISED           0x00000008
  24/*#define IMA_COLLECT           0x00000010  do not use this flag */
  25#define IMA_COLLECTED           0x00000020
  26#define IMA_AUDIT               0x00000040
  27#define IMA_AUDITED             0x00000080
  28
  29/* iint cache flags */
  30#define IMA_ACTION_FLAGS        0xff000000
  31#define IMA_DIGSIG              0x01000000
  32#define IMA_DIGSIG_REQUIRED     0x02000000
  33
  34#define IMA_DO_MASK             (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
  35                                 IMA_APPRAISE_SUBMASK)
  36#define IMA_DONE_MASK           (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
  37                                 IMA_COLLECTED | IMA_APPRAISED_SUBMASK)
  38
  39/* iint subaction appraise cache flags */
  40#define IMA_FILE_APPRAISE       0x00000100
  41#define IMA_FILE_APPRAISED      0x00000200
  42#define IMA_MMAP_APPRAISE       0x00000400
  43#define IMA_MMAP_APPRAISED      0x00000800
  44#define IMA_BPRM_APPRAISE       0x00001000
  45#define IMA_BPRM_APPRAISED      0x00002000
  46#define IMA_MODULE_APPRAISE     0x00004000
  47#define IMA_MODULE_APPRAISED    0x00008000
  48#define IMA_APPRAISE_SUBMASK    (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
  49                                 IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE)
  50#define IMA_APPRAISED_SUBMASK   (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
  51                                 IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED)
  52
  53enum evm_ima_xattr_type {
  54        IMA_XATTR_DIGEST = 0x01,
  55        EVM_XATTR_HMAC,
  56        EVM_IMA_XATTR_DIGSIG,
  57};
  58
  59struct evm_ima_xattr_data {
  60        u8 type;
  61        u8 digest[SHA1_DIGEST_SIZE];
  62} __packed;
  63
  64#define IMA_MAX_DIGEST_SIZE     64
  65
  66struct ima_digest_data {
  67        u8 algo;
  68        u8 length;
  69        u8 type;
  70        u8 digest[IMA_MAX_DIGEST_SIZE];
  71} __packed;
  72
  73/* integrity data associated with an inode */
  74struct integrity_iint_cache {
  75        struct rb_node rb_node; /* rooted in integrity_iint_tree */
  76        struct inode *inode;    /* back pointer to inode in question */
  77        u64 version;            /* track inode changes */
  78        unsigned long flags;
  79        enum integrity_status ima_file_status:4;
  80        enum integrity_status ima_mmap_status:4;
  81        enum integrity_status ima_bprm_status:4;
  82        enum integrity_status ima_module_status:4;
  83        enum integrity_status evm_status:4;
  84        struct ima_digest_data ima_hash;
  85};
  86
  87/* rbtree tree calls to lookup, insert, delete
  88 * integrity data associated with an inode.
  89 */
  90struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
  91struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
  92
  93#define INTEGRITY_KEYRING_EVM           0
  94#define INTEGRITY_KEYRING_MODULE        1
  95#define INTEGRITY_KEYRING_IMA           2
  96#define INTEGRITY_KEYRING_MAX           3
  97
  98#ifdef CONFIG_INTEGRITY_SIGNATURE
  99
 100int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
 101                                        const char *digest, int digestlen);
 102
 103int integrity_init_keyring(const unsigned int id);
 104#else
 105
 106static inline int integrity_digsig_verify(const unsigned int id,
 107                                          const char *sig, int siglen,
 108                                          const char *digest, int digestlen)
 109{
 110        return -EOPNOTSUPP;
 111}
 112
 113static inline int integrity_init_keyring(const unsigned int id)
 114{
 115        return 0;
 116}
 117#endif /* CONFIG_INTEGRITY_SIGNATURE */
 118
 119#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
 120int asymmetric_verify(struct key *keyring, const char *sig,
 121                      int siglen, const char *data, int datalen);
 122#else
 123static inline int asymmetric_verify(struct key *keyring, const char *sig,
 124                                    int siglen, const char *data, int datalen)
 125{
 126        return -EOPNOTSUPP;
 127}
 128#endif
 129
 130/* set during initialization */
 131extern int iint_initialized;
 132