integrity.h

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/*
 * Copyright (C) 2009-2010 IBM Corporation
 *
 * Authors:
 * Mimi Zohar <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, version 2 of the
 * License.
 *
 */

#include <linux/types.h>
#include <linux/integrity.h>
#include <crypto/sha.h>

/* iint action cache flags */
#define IMA_MEASURE     0x0001
#define IMA_MEASURED        0x0002
#define IMA_APPRAISE        0x0004
#define IMA_APPRAISED       0x0008
/*#define IMA_COLLECT       0x0010  do not use this flag */
#define IMA_COLLECTED       0x0020
#define IMA_AUDIT       0x0040
#define IMA_AUDITED     0x0080

/* iint cache flags */
#define IMA_DIGSIG      0x0100

#define IMA_DO_MASK     (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT)
#define IMA_DONE_MASK       (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED \
                 | IMA_COLLECTED)

enum evm_ima_xattr_type {
    IMA_XATTR_DIGEST = 0x01,
    EVM_XATTR_HMAC,
    EVM_IMA_XATTR_DIGSIG,
};

struct evm_ima_xattr_data {
    u8 type;
    u8 digest[SHA1_DIGEST_SIZE];
}  __attribute__((packed));

/* integrity data associated with an inode */
struct integrity_iint_cache {
    struct rb_node rb_node; /* rooted in integrity_iint_tree */
    struct inode *inode;    /* back pointer to inode in question */
    u64 version;        /* track inode changes */
    unsigned short flags;
    struct evm_ima_xattr_data ima_xattr;
    enum integrity_status ima_status;
    enum integrity_status evm_status;
};

/* rbtree tree calls to lookup, insert, delete
 * integrity data associated with an inode.
 */
struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
struct integrity_iint_cache *integrity_iint_find(struct inode *inode);

#define INTEGRITY_KEYRING_EVM       0
#define INTEGRITY_KEYRING_MODULE    1
#define INTEGRITY_KEYRING_IMA       2
#define INTEGRITY_KEYRING_MAX       3

#ifdef CONFIG_INTEGRITY_SIGNATURE

int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
                    const char *digest, int digestlen);

#else

static inline int integrity_digsig_verify(const unsigned int id,
                      const char *sig, int siglen,
                      const char *digest, int digestlen)
{
    return -EOPNOTSUPP;
}

#endif /* CONFIG_INTEGRITY_SIGNATURE */

/* set during initialization */
extern int iint_initialized;