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_ACTION_RULE_FLAGS   0x06000000
  32#define IMA_DIGSIG              0x01000000
  33#define IMA_DIGSIG_REQUIRED     0x02000000
  34#define IMA_PERMIT_DIRECTIO     0x04000000
  35#define IMA_NEW_FILE            0x08000000
  36
  37#define IMA_DO_MASK             (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
  38                                 IMA_APPRAISE_SUBMASK)
  39#define IMA_DONE_MASK           (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
  40                                 IMA_COLLECTED | IMA_APPRAISED_SUBMASK)
  41
  42/* iint subaction appraise cache flags */
  43#define IMA_FILE_APPRAISE       0x00000100
  44#define IMA_FILE_APPRAISED      0x00000200
  45#define IMA_MMAP_APPRAISE       0x00000400
  46#define IMA_MMAP_APPRAISED      0x00000800
  47#define IMA_BPRM_APPRAISE       0x00001000
  48#define IMA_BPRM_APPRAISED      0x00002000
  49#define IMA_READ_APPRAISE       0x00004000
  50#define IMA_READ_APPRAISED      0x00008000
  51#define IMA_APPRAISE_SUBMASK    (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
  52                                 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE)
  53#define IMA_APPRAISED_SUBMASK   (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
  54                                 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED)
  55
  56enum evm_ima_xattr_type {
  57        IMA_XATTR_DIGEST = 0x01,
  58        EVM_XATTR_HMAC,
  59        EVM_IMA_XATTR_DIGSIG,
  60        IMA_XATTR_DIGEST_NG,
  61        IMA_XATTR_LAST
  62};
  63
  64struct evm_ima_xattr_data {
  65        u8 type;
  66        u8 digest[SHA1_DIGEST_SIZE];
  67} __packed;
  68
  69#define IMA_MAX_DIGEST_SIZE     64
  70
  71struct ima_digest_data {
  72        u8 algo;
  73        u8 length;
  74        union {
  75                struct {
  76                        u8 unused;
  77                        u8 type;
  78                } sha1;
  79                struct {
  80                        u8 type;
  81                        u8 algo;
  82                } ng;
  83                u8 data[2];
  84        } xattr;
  85        u8 digest[0];
  86} __packed;
  87
  88/*
  89 * signature format v2 - for using with asymmetric keys
  90 */
  91struct signature_v2_hdr {
  92        uint8_t type;           /* xattr type */
  93        uint8_t version;        /* signature format version */
  94        uint8_t hash_algo;      /* Digest algorithm [enum hash_algo] */
  95        uint32_t keyid;         /* IMA key identifier - not X509/PGP specific */
  96        uint16_t sig_size;      /* signature size */
  97        uint8_t sig[0];         /* signature payload */
  98} __packed;
  99
 100/* integrity data associated with an inode */
 101struct integrity_iint_cache {
 102        struct rb_node rb_node; /* rooted in integrity_iint_tree */
 103        struct inode *inode;    /* back pointer to inode in question */
 104        u64 version;            /* track inode changes */
 105        unsigned long flags;
 106        unsigned long measured_pcrs;
 107        enum integrity_status ima_file_status:4;
 108        enum integrity_status ima_mmap_status:4;
 109        enum integrity_status ima_bprm_status:4;
 110        enum integrity_status ima_read_status:4;
 111        enum integrity_status evm_status:4;
 112        struct ima_digest_data *ima_hash;
 113};
 114
 115/* rbtree tree calls to lookup, insert, delete
 116 * integrity data associated with an inode.
 117 */
 118struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
 119
 120int integrity_kernel_read(struct file *file, loff_t offset,
 121                          char *addr, unsigned long count);
 122int __init integrity_read_file(const char *path, char **data);
 123
 124#define INTEGRITY_KEYRING_EVM           0
 125#define INTEGRITY_KEYRING_IMA           1
 126#define INTEGRITY_KEYRING_MODULE        2
 127#define INTEGRITY_KEYRING_MAX           3
 128
 129#ifdef CONFIG_INTEGRITY_SIGNATURE
 130
 131int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
 132                            const char *digest, int digestlen);
 133
 134int __init integrity_init_keyring(const unsigned int id);
 135int __init integrity_load_x509(const unsigned int id, const char *path);
 136#else
 137
 138static inline int integrity_digsig_verify(const unsigned int id,
 139                                          const char *sig, int siglen,
 140                                          const char *digest, int digestlen)
 141{
 142        return -EOPNOTSUPP;
 143}
 144
 145static inline int integrity_init_keyring(const unsigned int id)
 146{
 147        return 0;
 148}
 149#endif /* CONFIG_INTEGRITY_SIGNATURE */
 150
 151#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
 152int asymmetric_verify(struct key *keyring, const char *sig,
 153                      int siglen, const char *data, int datalen);
 154#else
 155static inline int asymmetric_verify(struct key *keyring, const char *sig,
 156                                    int siglen, const char *data, int datalen)
 157{
 158        return -EOPNOTSUPP;
 159}
 160#endif
 161
 162#ifdef CONFIG_IMA_LOAD_X509
 163void __init ima_load_x509(void);
 164#else
 165static inline void ima_load_x509(void)
 166{
 167}
 168#endif
 169
 170#ifdef CONFIG_EVM_LOAD_X509
 171void __init evm_load_x509(void);
 172#else
 173static inline void evm_load_x509(void)
 174{
 175}
 176#endif
 177
 178#ifdef CONFIG_INTEGRITY_AUDIT
 179/* declarations */
 180void integrity_audit_msg(int audit_msgno, struct inode *inode,
 181                         const unsigned char *fname, const char *op,
 182                         const char *cause, int result, int info);
 183#else
 184static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
 185                                       const unsigned char *fname,
 186                                       const char *op, const char *cause,
 187                                       int result, int info)
 188{
 189}
 190#endif
 191