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 cache flags */
  19 #define IMA_MEASURED            0x01
  20
  21 enum evm_ima_xattr_type {
  22         IMA_XATTR_DIGEST = 0x01,
  23         EVM_XATTR_HMAC,
  24         EVM_IMA_XATTR_DIGSIG,
  25 };
  26
  27 struct evm_ima_xattr_data {
  28         u8 type;
  29         u8 digest[SHA1_DIGEST_SIZE];
  30 }  __attribute__((packed));
  31
  32 /* integrity data associated with an inode */
  33 struct integrity_iint_cache {
  34         struct rb_node rb_node; /* rooted in integrity_iint_tree */
  35         struct inode *inode;    /* back pointer to inode in question */
  36         u64 version;            /* track inode changes */
  37         unsigned char flags;
  38         u8 digest[SHA1_DIGEST_SIZE];
  39         struct mutex mutex;     /* protects: version, flags, digest */
  40         enum integrity_status evm_status;
  41 };
  42
  43 /* rbtree tree calls to lookup, insert, delete
  44  * integrity data associated with an inode.
  45  */
  46 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
  47 struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
  48
  49 #define INTEGRITY_KEYRING_EVM           0
  50 #define INTEGRITY_KEYRING_MODULE        1
  51 #define INTEGRITY_KEYRING_IMA           2
  52 #define INTEGRITY_KEYRING_MAX           3
  53
  54 #ifdef CONFIG_INTEGRITY_SIGNATURE
  55
  56 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
  57                                         const char *digest, int digestlen);
  58
  59 #else
  60
  61 static inline int integrity_digsig_verify(const unsigned int id,
  62                                           const char *sig, int siglen,
  63                                           const char *digest, int digestlen)
  64 {
  65         return -EOPNOTSUPP;
  66 }
  67
  68 #endif /* CONFIG_INTEGRITY_SIGNATURE */
  69
  70 /* set during initialization */
  71 extern int iint_initialized;