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        IMA_XATTR_DIGEST_NG,
  58};
  59
  60struct evm_ima_xattr_data {
  61        u8 type;
  62        u8 digest[SHA1_DIGEST_SIZE];
  63} __packed;
  64
  65#define IMA_MAX_DIGEST_SIZE     64
  66
  67struct ima_digest_data {
  68        u8 algo;
  69        u8 length;
  70        union {
  71                struct {
  72                        u8 unused;
  73                        u8 type;
  74                } sha1;
  75                struct {
  76                        u8 type;
  77                        u8 algo;
  78                } ng;
  79                u8 data[2];
  80        } xattr;
  81        u8 digest[0];
  82} __packed;
  83
  84/*
  85 * signature format v2 - for using with asymmetric keys
  86 */
  87struct signature_v2_hdr {
  88        uint8_t type;           /* xattr type */
  89        uint8_t version;        /* signature format version */
  90        uint8_t hash_algo;      /* Digest algorithm [enum pkey_hash_algo] */
  91        uint32_t keyid;         /* IMA key identifier - not X509/PGP specific */
  92        uint16_t sig_size;      /* signature size */
  93        uint8_t sig[0];         /* signature payload */
  94} __packed;
  95
  96/* integrity data associated with an inode */
  97struct integrity_iint_cache {
  98        struct rb_node rb_node; /* rooted in integrity_iint_tree */
  99        struct inode *inode;    /* back pointer to inode in question */
 100        u64 version;            /* track inode changes */
 101        unsigned long flags;
 102        enum integrity_status ima_file_status:4;
 103        enum integrity_status ima_mmap_status:4;
 104        enum integrity_status ima_bprm_status:4;
 105        enum integrity_status ima_module_status:4;
 106        enum integrity_status evm_status:4;
 107        struct ima_digest_data *ima_hash;
 108};
 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#define INTEGRITY_KEYRING_EVM           0
 117#define INTEGRITY_KEYRING_MODULE        1
 118#define INTEGRITY_KEYRING_IMA           2
 119#define INTEGRITY_KEYRING_MAX           3
 120
 121#ifdef CONFIG_INTEGRITY_SIGNATURE
 122
 123int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
 124                            const char *digest, int digestlen);
 125
 126#else
 127
 128static inline int integrity_digsig_verify(const unsigned int id,
 129                                          const char *sig, int siglen,
 130                                          const char *digest, int digestlen)
 131{
 132        return -EOPNOTSUPP;
 133}
 134
 135#endif /* CONFIG_INTEGRITY_SIGNATURE */
 136
 137#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
 138int asymmetric_verify(struct key *keyring, const char *sig,
 139                      int siglen, const char *data, int datalen);
 140#else
 141static inline int asymmetric_verify(struct key *keyring, const char *sig,
 142                                    int siglen, const char *data, int datalen)
 143{
 144        return -EOPNOTSUPP;
 145}
 146#endif
 147
 148#ifdef CONFIG_INTEGRITY_AUDIT
 149/* declarations */
 150void integrity_audit_msg(int audit_msgno, struct inode *inode,
 151                         const unsigned char *fname, const char *op,
 152                         const char *cause, int result, int info);
 153#else
 154static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
 155                                       const unsigned char *fname,
 156                                       const char *op, const char *cause,
 157                                       int result, int info)
 158{
 159}
 160#endif
 161
 162/* set during initialization */
 163extern int iint_initialized;
 164