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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2005-2010 IBM Corporation
*
* Authors:
* Mimi Zohar <zohar@us.ibm.com>
* Kylene Hall <kjhall@us.ibm.com>
*
* File: evm.h
*/
#ifndef __INTEGRITY_EVM_H
#define __INTEGRITY_EVM_H
#include <linux/xattr.h>
#include <linux/security.h>
#include "../integrity.h"
#define EVM_INIT_HMAC 0x0001
#define EVM_INIT_X509 0x0002
#define EVM_ALLOW_METADATA_WRITES 0x0004
#define EVM_SETUP_COMPLETE 0x80000000 /* userland has signaled key load */
#define EVM_KEY_MASK (EVM_INIT_HMAC | EVM_INIT_X509)
#define EVM_INIT_MASK (EVM_INIT_HMAC | EVM_INIT_X509 | EVM_SETUP_COMPLETE | \
EVM_ALLOW_METADATA_WRITES)
struct xattr_list {
struct list_head list;
char *name;
bool enabled;
};
#define EVM_NEW_FILE 0x00000001
#define EVM_IMMUTABLE_DIGSIG 0x00000002
/* EVM integrity metadata associated with an inode */
struct evm_iint_cache {
unsigned long flags;
enum integrity_status evm_status:4;
struct integrity_inode_attributes metadata_inode;
};
extern struct lsm_blob_sizes evm_blob_sizes;
static inline struct evm_iint_cache *evm_iint_inode(const struct inode *inode)
{
if (unlikely(!inode->i_security))
return NULL;
return inode->i_security + evm_blob_sizes.lbs_inode;
}
extern int evm_initialized;
#define EVM_ATTR_FSUUID 0x0001
extern int evm_hmac_attrs;
/* List of EVM protected security xattrs */
extern struct list_head evm_config_xattrnames;
struct evm_digest {
struct ima_digest_data_hdr hdr;
char digest[IMA_MAX_DIGEST_SIZE];
} __packed;
int evm_protected_xattr(const char *req_xattr_name);
int evm_init_key(void);
int evm_update_evmxattr(struct dentry *dentry,
const char *req_xattr_name,
const char *req_xattr_value,
size_t req_xattr_value_len);
int evm_calc_hmac(struct dentry *dentry, const char *req_xattr_name,
const char *req_xattr_value,
size_t req_xattr_value_len, struct evm_digest *data,
struct evm_iint_cache *iint);
int evm_calc_hash(struct dentry *dentry, const char *req_xattr_name,
const char *req_xattr_value,
size_t req_xattr_value_len, char type,
struct evm_digest *data, struct evm_iint_cache *iint);
int evm_init_hmac(struct inode *inode, const struct xattr *xattrs,
char *hmac_val);
int evm_init_secfs(void);
#endif
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