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
  53 enum evm_ima_xattr_type {
  54         IMA_XATTR_DIGEST = 0x01,
  55         EVM_XATTR_HMAC,
  56         EVM_IMA_XATTR_DIGSIG,
  57 };
  58
  59 struct evm_ima_xattr_data {
  60         u8 type;
  61         u8 digest[SHA1_DIGEST_SIZE];
  62 }  __attribute__((packed));
  63
  64 /* integrity data associated with an inode */
  65 struct 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  */
  81 struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
  82 struct 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
  91 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
  92                                         const char *digest, int digestlen);
  93
  94 #else
  95
  96 static 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
 106 int asymmetric_verify(struct key *keyring, const char *sig,
 107                       int siglen, const char *data, int datalen);
 108 #else
 109 static 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 */
 118 void 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
 122 static 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 */
 131 extern int iint_initialized;