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 #define IMA_PERMIT_DIRECTIO     0x04000000
  34
  35 #define IMA_DO_MASK             (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
  36                                  IMA_APPRAISE_SUBMASK)
  37 #define IMA_DONE_MASK           (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
  38                                  IMA_COLLECTED | IMA_APPRAISED_SUBMASK)
  39
  40 /* iint subaction appraise cache flags */
  41 #define IMA_FILE_APPRAISE       0x00000100
  42 #define IMA_FILE_APPRAISED      0x00000200
  43 #define IMA_MMAP_APPRAISE       0x00000400
  44 #define IMA_MMAP_APPRAISED      0x00000800
  45 #define IMA_BPRM_APPRAISE       0x00001000
  46 #define IMA_BPRM_APPRAISED      0x00002000
  47 #define IMA_MODULE_APPRAISE     0x00004000
  48 #define IMA_MODULE_APPRAISED    0x00008000
  49 #define IMA_APPRAISE_SUBMASK    (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
  50                                  IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE)
  51 #define IMA_APPRAISED_SUBMASK   (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
  52                                  IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED)
  53
  54 enum evm_ima_xattr_type {
  55         IMA_XATTR_DIGEST = 0x01,
  56         EVM_XATTR_HMAC,
  57         EVM_IMA_XATTR_DIGSIG,
  58 };
  59
  60 struct evm_ima_xattr_data {
  61         u8 type;
  62         u8 digest[SHA1_DIGEST_SIZE];
  63 }  __attribute__((packed));
  64
  65 /* integrity data associated with an inode */
  66 struct integrity_iint_cache {
  67         struct rb_node rb_node; /* rooted in integrity_iint_tree */
  68         struct inode *inode;    /* back pointer to inode in question */
  69         u64 version;            /* track inode changes */
  70         unsigned long flags;
  71         struct evm_ima_xattr_data ima_xattr;
  72         enum integrity_status ima_file_status:4;
  73         enum integrity_status ima_mmap_status:4;
  74         enum integrity_status ima_bprm_status:4;
  75         enum integrity_status ima_module_status:4;
  76         enum integrity_status evm_status:4;
  77 };
  78
  79 /* rbtree tree calls to lookup, insert, delete
  80  * integrity data associated with an inode.
  81  */
  82 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
  83 struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
  84
  85 #define INTEGRITY_KEYRING_EVM           0
  86 #define INTEGRITY_KEYRING_MODULE        1
  87 #define INTEGRITY_KEYRING_IMA           2
  88 #define INTEGRITY_KEYRING_MAX           3
  89
  90 #ifdef CONFIG_INTEGRITY_SIGNATURE
  91
  92 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
  93                                         const char *digest, int digestlen);
  94
  95 #else
  96
  97 static inline int integrity_digsig_verify(const unsigned int id,
  98                                           const char *sig, int siglen,
  99                                           const char *digest, int digestlen)
 100 {
 101         return -EOPNOTSUPP;
 102 }
 103
 104 #endif /* CONFIG_INTEGRITY_SIGNATURE */
 105
 106 #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
 107 int asymmetric_verify(struct key *keyring, const char *sig,
 108                       int siglen, const char *data, int datalen);
 109 #else
 110 static inline int asymmetric_verify(struct key *keyring, const char *sig,
 111                                     int siglen, const char *data, int datalen)
 112 {
 113         return -EOPNOTSUPP;
 114 }
 115 #endif
 116
 117 #ifdef CONFIG_INTEGRITY_AUDIT
 118 /* declarations */
 119 void integrity_audit_msg(int audit_msgno, struct inode *inode,
 120                          const unsigned char *fname, const char *op,
 121                          const char *cause, int result, int info);
 122 #else
 123 static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
 124                                        const unsigned char *fname,
 125                                        const char *op, const char *cause,
 126                                        int result, int info)
 127 {
 128 }
 129 #endif
 130
 131 /* set during initialization */
 132 extern int iint_initialized;