include/linux/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>
  15 struct linux_binprm;
  16
  17 #ifdef CONFIG_IMA
  18 extern enum hash_algo ima_get_current_hash_algo(void);
  19 extern int ima_file_hash(struct file *file, char *buf, size_t buf_size);
  20 extern int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size);
  21 extern void ima_kexec_cmdline(int kernel_fd, const void *buf, int size);
  22 extern 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
  28 extern void ima_appraise_parse_cmdline(void);
  29 #else
  30 static inline void ima_appraise_parse_cmdline(void) {}
  31 #endif
  32
  33 #ifdef CONFIG_IMA_KEXEC
  34 extern void ima_add_kexec_buffer(struct kimage *image);
  35 #endif
  36
  37 #else
  38 static inline enum hash_algo ima_get_current_hash_algo(void)
  39 {
  40         return HASH_ALGO__LAST;
  41 }
  42
  43 static inline int ima_file_hash(struct file *file, char *buf, size_t buf_size)
  44 {
  45         return -EOPNOTSUPP;
  46 }
  47
  48 static inline int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size)
  49 {
  50         return -EOPNOTSUPP;
  51 }
  52
  53 static inline void ima_kexec_cmdline(int kernel_fd, const void *buf, int size) {}
  54
  55 static inline int ima_measure_critical_data(const char *event_label,
  56                                              const char *event_name,
  57                                              const void *buf, size_t buf_len,
  58                                              bool hash, u8 *digest,
  59                                              size_t digest_len)
  60 {
  61         return -ENOENT;
  62 }
  63
  64 #endif /* CONFIG_IMA */
  65
  66 #ifdef CONFIG_HAVE_IMA_KEXEC
  67 int __init ima_free_kexec_buffer(void);
  68 int __init ima_get_kexec_buffer(void **addr, size_t *size);
  69 #endif
  70
  71 #ifdef CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT
  72 extern bool arch_ima_get_secureboot(void);
  73 extern const char * const *arch_get_ima_policy(void);
  74 #else
  75 static inline bool arch_ima_get_secureboot(void)
  76 {
  77         return false;
  78 }
  79
  80 static inline const char * const *arch_get_ima_policy(void)
  81 {
  82         return NULL;
  83 }
  84 #endif
  85
  86 #ifndef CONFIG_IMA_KEXEC
  87 struct kimage;
  88
  89 static inline void ima_add_kexec_buffer(struct kimage *image)
  90 {}
  91 #endif
  92
  93 #ifdef CONFIG_IMA_APPRAISE
  94 extern bool is_ima_appraise_enabled(void);
  95 #else
  96 static inline bool is_ima_appraise_enabled(void)
  97 {
  98         return 0;
  99 }
 100 #endif /* CONFIG_IMA_APPRAISE */
 101
 102 #if defined(CONFIG_IMA_APPRAISE) && defined(CONFIG_INTEGRITY_TRUSTED_KEYRING)
 103 extern bool ima_appraise_signature(enum kernel_read_file_id func);
 104 #else
 105 static inline bool ima_appraise_signature(enum kernel_read_file_id func)
 106 {
 107         return false;
 108 }
 109 #endif /* CONFIG_IMA_APPRAISE && CONFIG_INTEGRITY_TRUSTED_KEYRING */
 110 #endif /* _LINUX_IMA_H */