include/linux/verification.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* Signature verification
   3  *
   4  * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
   5  * Written by David Howells (dhowells@redhat.com)
   6  */
   7
   8 #ifndef _LINUX_VERIFICATION_H
   9 #define _LINUX_VERIFICATION_H
  10
  11 #include <linux/types.h>
  12
  13 /*
  14  * Indicate that both builtin trusted keys and secondary trusted keys
  15  * should be used.
  16  */
  17 #define VERIFY_USE_SECONDARY_KEYRING ((struct key *)1UL)
  18 #define VERIFY_USE_PLATFORM_KEYRING  ((struct key *)2UL)
  19
  20 static inline int system_keyring_id_check(u64 id)
  21 {
  22         if (id > (unsigned long)VERIFY_USE_PLATFORM_KEYRING)
  23                 return -EINVAL;
  24
  25         return 0;
  26 }
  27
  28 /*
  29  * The use to which an asymmetric key is being put.
  30  */
  31 enum key_being_used_for {
  32         VERIFYING_MODULE_SIGNATURE,
  33         VERIFYING_FIRMWARE_SIGNATURE,
  34         VERIFYING_KEXEC_PE_SIGNATURE,
  35         VERIFYING_KEY_SIGNATURE,
  36         VERIFYING_KEY_SELF_SIGNATURE,
  37         VERIFYING_UNSPECIFIED_SIGNATURE,
  38         NR__KEY_BEING_USED_FOR
  39 };
  40 extern const char *const key_being_used_for[NR__KEY_BEING_USED_FOR];
  41
  42 #ifdef CONFIG_SYSTEM_DATA_VERIFICATION
  43
  44 struct key;
  45 struct pkcs7_message;
  46
  47 extern int verify_pkcs7_signature(const void *data, size_t len,
  48                                   const void *raw_pkcs7, size_t pkcs7_len,
  49                                   struct key *trusted_keys,
  50                                   enum key_being_used_for usage,
  51                                   int (*view_content)(void *ctx,
  52                                                       const void *data, size_t len,
  53                                                       size_t asn1hdrlen),
  54                                   void *ctx);
  55 extern int verify_pkcs7_message_sig(const void *data, size_t len,
  56                                     struct pkcs7_message *pkcs7,
  57                                     struct key *trusted_keys,
  58                                     enum key_being_used_for usage,
  59                                     int (*view_content)(void *ctx,
  60                                                         const void *data,
  61                                                         size_t len,
  62                                                         size_t asn1hdrlen),
  63                                     void *ctx);
  64
  65 #ifdef CONFIG_SIGNED_PE_FILE_VERIFICATION
  66 extern int verify_pefile_signature(const void *pebuf, unsigned pelen,
  67                                    struct key *trusted_keys,
  68                                    enum key_being_used_for usage);
  69 #endif
  70
  71 #endif /* CONFIG_SYSTEM_DATA_VERIFICATION */
  72 #endif /* _LINUX_VERIFY_PEFILE_H */