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
  18 /* iint action cache flags */
  19 #define IMA_MEASURE             0x0001
  20 #define IMA_MEASURED            0x0002
  21 #define IMA_APPRAISE            0x0004
  22 #define IMA_APPRAISED           0x0008
  23 /*#define IMA_COLLECT           0x0010  do not use this flag */
  24 #define IMA_COLLECTED           0x0020
  25
  26 /* iint cache flags */
  27 #define IMA_DIGSIG              0x0100
  28
  29 #define IMA_DO_MASK             (IMA_MEASURE | IMA_APPRAISE)
  30 #define IMA_DONE_MASK           (IMA_MEASURED | IMA_APPRAISED | IMA_COLLECTED)
  31
  32 enum evm_ima_xattr_type {
  33         IMA_XATTR_DIGEST = 0x01,
  34         EVM_XATTR_HMAC,
  35         EVM_IMA_XATTR_DIGSIG,
  36 };
  37
  38 struct evm_ima_xattr_data {
  39         u8 type;
  40         u8 digest[SHA1_DIGEST_SIZE];
  41 }  __attribute__((packed));
  42
  43 /* integrity data associated with an inode */
  44 struct integrity_iint_cache {
  45         struct rb_node rb_node; /* rooted in integrity_iint_tree */
  46         struct inode *inode;    /* back pointer to inode in question */
  47         u64 version;            /* track inode changes */
  48         unsigned char flags;
  49         struct evm_ima_xattr_data ima_xattr;
  50         enum integrity_status ima_status;
  51         enum integrity_status evm_status;
  52 };
  53
  54 /* rbtree tree calls to lookup, insert, delete
  55  * integrity data associated with an inode.
  56  */
  57 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
  58 struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
  59
  60 #define INTEGRITY_KEYRING_EVM           0
  61 #define INTEGRITY_KEYRING_MODULE        1
  62 #define INTEGRITY_KEYRING_IMA           2
  63 #define INTEGRITY_KEYRING_MAX           3
  64
  65 #ifdef CONFIG_INTEGRITY_SIGNATURE
  66
  67 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
  68                                         const char *digest, int digestlen);
  69
  70 #else
  71
  72 static inline int integrity_digsig_verify(const unsigned int id,
  73                                           const char *sig, int siglen,
  74                                           const char *digest, int digestlen)
  75 {
  76         return -EOPNOTSUPP;
  77 }
  78
  79 #endif /* CONFIG_INTEGRITY_SIGNATURE */
  80
  81 /* set during initialization */
  82 extern int iint_initialized;