1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun
3*4882a593Smuzhiyun #include <linux/kernel.h>
4*4882a593Smuzhiyun #include <linux/sched.h>
5*4882a593Smuzhiyun #include <linux/cred.h>
6*4882a593Smuzhiyun #include <linux/err.h>
7*4882a593Smuzhiyun #include <linux/efi.h>
8*4882a593Smuzhiyun #include <linux/slab.h>
9*4882a593Smuzhiyun #include <keys/asymmetric-type.h>
10*4882a593Smuzhiyun #include <keys/system_keyring.h>
11*4882a593Smuzhiyun #include "../integrity.h"
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun static efi_guid_t efi_cert_x509_guid __initdata = EFI_CERT_X509_GUID;
14*4882a593Smuzhiyun static efi_guid_t efi_cert_x509_sha256_guid __initdata =
15*4882a593Smuzhiyun EFI_CERT_X509_SHA256_GUID;
16*4882a593Smuzhiyun static efi_guid_t efi_cert_sha256_guid __initdata = EFI_CERT_SHA256_GUID;
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun /*
19*4882a593Smuzhiyun * Blacklist a hash.
20*4882a593Smuzhiyun */
uefi_blacklist_hash(const char * source,const void * data,size_t len,const char * type,size_t type_len)21*4882a593Smuzhiyun static __init void uefi_blacklist_hash(const char *source, const void *data,
22*4882a593Smuzhiyun size_t len, const char *type,
23*4882a593Smuzhiyun size_t type_len)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun char *hash, *p;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun hash = kmalloc(type_len + len * 2 + 1, GFP_KERNEL);
28*4882a593Smuzhiyun if (!hash)
29*4882a593Smuzhiyun return;
30*4882a593Smuzhiyun p = memcpy(hash, type, type_len);
31*4882a593Smuzhiyun p += type_len;
32*4882a593Smuzhiyun bin2hex(p, data, len);
33*4882a593Smuzhiyun p += len * 2;
34*4882a593Smuzhiyun *p = 0;
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun mark_hash_blacklisted(hash);
37*4882a593Smuzhiyun kfree(hash);
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun /*
41*4882a593Smuzhiyun * Blacklist an X509 TBS hash.
42*4882a593Smuzhiyun */
uefi_blacklist_x509_tbs(const char * source,const void * data,size_t len)43*4882a593Smuzhiyun static __init void uefi_blacklist_x509_tbs(const char *source,
44*4882a593Smuzhiyun const void *data, size_t len)
45*4882a593Smuzhiyun {
46*4882a593Smuzhiyun uefi_blacklist_hash(source, data, len, "tbs:", 4);
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun /*
50*4882a593Smuzhiyun * Blacklist the hash of an executable.
51*4882a593Smuzhiyun */
uefi_blacklist_binary(const char * source,const void * data,size_t len)52*4882a593Smuzhiyun static __init void uefi_blacklist_binary(const char *source,
53*4882a593Smuzhiyun const void *data, size_t len)
54*4882a593Smuzhiyun {
55*4882a593Smuzhiyun uefi_blacklist_hash(source, data, len, "bin:", 4);
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun /*
59*4882a593Smuzhiyun * Add an X509 cert to the revocation list.
60*4882a593Smuzhiyun */
uefi_revocation_list_x509(const char * source,const void * data,size_t len)61*4882a593Smuzhiyun static __init void uefi_revocation_list_x509(const char *source,
62*4882a593Smuzhiyun const void *data, size_t len)
63*4882a593Smuzhiyun {
64*4882a593Smuzhiyun add_key_to_revocation_list(data, len);
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun /*
68*4882a593Smuzhiyun * Return the appropriate handler for particular signature list types found in
69*4882a593Smuzhiyun * the UEFI db and MokListRT tables.
70*4882a593Smuzhiyun */
get_handler_for_db(const efi_guid_t * sig_type)71*4882a593Smuzhiyun __init efi_element_handler_t get_handler_for_db(const efi_guid_t *sig_type)
72*4882a593Smuzhiyun {
73*4882a593Smuzhiyun if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0)
74*4882a593Smuzhiyun return add_to_platform_keyring;
75*4882a593Smuzhiyun return 0;
76*4882a593Smuzhiyun }
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun /*
79*4882a593Smuzhiyun * Return the appropriate handler for particular signature list types found in
80*4882a593Smuzhiyun * the UEFI dbx and MokListXRT tables.
81*4882a593Smuzhiyun */
get_handler_for_dbx(const efi_guid_t * sig_type)82*4882a593Smuzhiyun __init efi_element_handler_t get_handler_for_dbx(const efi_guid_t *sig_type)
83*4882a593Smuzhiyun {
84*4882a593Smuzhiyun if (efi_guidcmp(*sig_type, efi_cert_x509_sha256_guid) == 0)
85*4882a593Smuzhiyun return uefi_blacklist_x509_tbs;
86*4882a593Smuzhiyun if (efi_guidcmp(*sig_type, efi_cert_sha256_guid) == 0)
87*4882a593Smuzhiyun return uefi_blacklist_binary;
88*4882a593Smuzhiyun if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0)
89*4882a593Smuzhiyun return uefi_revocation_list_x509;
90*4882a593Smuzhiyun return 0;
91*4882a593Smuzhiyun }
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