ima.h

  1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * Copyright (C) 2008 IBM Corporation
  4 * Author: Mimi Zohar <zohar@us.ibm.com>
  5 */
  6
  7#ifndef _LINUX_IMA_H
  8#define _LINUX_IMA_H
  9
 10#include <linux/kernel_read_file.h>
 11#include <linux/fs.h>
 12#include <linux/security.h>
 13#include <linux/kexec.h>
 14#include <crypto/hash_info.h>
 15struct linux_binprm;
 16
 17#ifdef CONFIG_IMA
 18extern enum hash_algo ima_get_current_hash_algo(void);
 19extern int ima_file_hash(struct file *file, char *buf, size_t buf_size);
 20extern int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size);
 21extern void ima_kexec_cmdline(int kernel_fd, const void *buf, int size);
 22extern int ima_measure_critical_data(const char *event_label,
 23				     const char *event_name,
 24				     const void *buf, size_t buf_len,
 25				     bool hash, u8 *digest, size_t digest_len);
 26
 27#ifdef CONFIG_IMA_APPRAISE_BOOTPARAM
 28extern void ima_appraise_parse_cmdline(void);
 29#else
 30static inline void ima_appraise_parse_cmdline(void) {}
 31#endif
 32
 33#ifdef CONFIG_IMA_KEXEC
 34extern void ima_add_kexec_buffer(struct kimage *image);
 35extern void ima_kexec_post_load(struct kimage *image);
 36#else
 37static inline void ima_kexec_post_load(struct kimage *image) {}
 38#endif
 39
 40#else
 41static inline enum hash_algo ima_get_current_hash_algo(void)
 42{
 43	return HASH_ALGO__LAST;
 44}
 45
 46static inline int ima_file_hash(struct file *file, char *buf, size_t buf_size)
 47{
 48	return -EOPNOTSUPP;
 49}
 50
 51static inline int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size)
 52{
 53	return -EOPNOTSUPP;
 54}
 55
 56static inline void ima_kexec_cmdline(int kernel_fd, const void *buf, int size) {}
 57
 58static inline int ima_measure_critical_data(const char *event_label,
 59					     const char *event_name,
 60					     const void *buf, size_t buf_len,
 61					     bool hash, u8 *digest,
 62					     size_t digest_len)
 63{
 64	return -ENOENT;
 65}
 66
 67#endif /* CONFIG_IMA */
 68
 69#ifdef CONFIG_HAVE_IMA_KEXEC
 70int __init ima_free_kexec_buffer(void);
 71int __init ima_get_kexec_buffer(void **addr, size_t *size);
 72int ima_validate_range(phys_addr_t phys, size_t size);
 73#endif
 74
 75#ifdef CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT
 76extern bool arch_ima_get_secureboot(void);
 77extern const char * const *arch_get_ima_policy(void);
 78#else
 79static inline bool arch_ima_get_secureboot(void)
 80{
 81	return false;
 82}
 83
 84static inline const char * const *arch_get_ima_policy(void)
 85{
 86	return NULL;
 87}
 88#endif
 89
 90#ifndef CONFIG_IMA_KEXEC
 91struct kimage;
 92
 93static inline void ima_add_kexec_buffer(struct kimage *image)
 94{}
 95#endif
 96
 97#ifdef CONFIG_IMA_APPRAISE
 98extern bool is_ima_appraise_enabled(void);
 99#else
100static inline bool is_ima_appraise_enabled(void)
101{
102	return 0;
103}
104#endif /* CONFIG_IMA_APPRAISE */
105
106#if defined(CONFIG_IMA_APPRAISE) && defined(CONFIG_INTEGRITY_TRUSTED_KEYRING)
107extern bool ima_appraise_signature(enum kernel_read_file_id func);
108#else
109static inline bool ima_appraise_signature(enum kernel_read_file_id func)
110{
111	return false;
112}
113#endif /* CONFIG_IMA_APPRAISE && CONFIG_INTEGRITY_TRUSTED_KEYRING */
114#endif /* _LINUX_IMA_H */