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}  __attribute__((packed));
  63
  64/* integrity data associated with an inode */
  65struct integrity_iint_cache {
  66        struct rb_node rb_node; /* rooted in integrity_iint_tree */
  67        struct inode *inode;    /* back pointer to inode in question */
  68        u64 version;            /* track inode changes */
  69        unsigned long flags;
  70        struct evm_ima_xattr_data ima_xattr;
  71        enum integrity_status ima_file_status:4;
  72        enum integrity_status ima_mmap_status:4;
  73        enum integrity_status ima_bprm_status:4;
  74        enum integrity_status ima_module_status:4;
  75        enum integrity_status evm_status:4;
  76};
  77
  78/* rbtree tree calls to lookup, insert, delete
  79 * integrity data associated with an inode.
  80 */
  81struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
  82struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
  83
  84#define INTEGRITY_KEYRING_EVM           0
  85#define INTEGRITY_KEYRING_MODULE        1
  86#define INTEGRITY_KEYRING_IMA           2
  87#define INTEGRITY_KEYRING_MAX           3
  88
  89#ifdef CONFIG_INTEGRITY_SIGNATURE
  90
  91int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
  92                                        const char *digest, int digestlen);
  93
  94#else
  95
  96static inline int integrity_digsig_verify(const unsigned int id,
  97                                          const char *sig, int siglen,
  98                                          const char *digest, int digestlen)
  99{
 100        return -EOPNOTSUPP;
 101}
 102
 103#endif /* CONFIG_INTEGRITY_SIGNATURE */
 104
 105#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
 106int asymmetric_verify(struct key *keyring, const char *sig,
 107                      int siglen, const char *data, int datalen);
 108#else
 109static inline int asymmetric_verify(struct key *keyring, const char *sig,
 110                                    int siglen, const char *data, int datalen)
 111{
 112        return -EOPNOTSUPP;
 113}
 114#endif
 115
 116#ifdef CONFIG_INTEGRITY_AUDIT
 117/* declarations */
 118void integrity_audit_msg(int audit_msgno, struct inode *inode,
 119                         const unsigned char *fname, const char *op,
 120                         const char *cause, int result, int info);
 121#else
 122static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
 123                                       const unsigned char *fname,
 124                                       const char *op, const char *cause,
 125                                       int result, int info)
 126{
 127}
 128#endif
 129
 130/* set during initialization */
 131extern int iint_initialized;
 132