1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <linux/kernel.h> 4 #include <linux/sched.h> 5 #include <linux/cred.h> 6 #include <linux/err.h> 7 #include <linux/efi.h> 8 #include <linux/slab.h> 9 #include <keys/asymmetric-type.h> 10 #include <keys/system_keyring.h> 11 #include "../integrity.h" 12 #include "keyring_handler.h" 13 14 static efi_guid_t efi_cert_x509_guid __initdata = EFI_CERT_X509_GUID; 15 static efi_guid_t efi_cert_x509_sha256_guid __initdata = 16 EFI_CERT_X509_SHA256_GUID; 17 static efi_guid_t efi_cert_sha256_guid __initdata = EFI_CERT_SHA256_GUID; 18 19 /* 20 * Blacklist an X509 TBS hash. 21 */ 22 static __init void uefi_blacklist_x509_tbs(const char *source, 23 const void *data, size_t len) 24 { 25 mark_hash_blacklisted(data, len, BLACKLIST_HASH_X509_TBS); 26 } 27 28 /* 29 * Blacklist the hash of an executable. 30 */ 31 static __init void uefi_blacklist_binary(const char *source, 32 const void *data, size_t len) 33 { 34 mark_hash_blacklisted(data, len, BLACKLIST_HASH_BINARY); 35 } 36 37 /* 38 * Add an X509 cert to the revocation list. 39 */ 40 static __init void uefi_revocation_list_x509(const char *source, 41 const void *data, size_t len) 42 { 43 add_key_to_revocation_list(data, len); 44 } 45 46 /* 47 * Return the appropriate handler for particular signature list types found in 48 * the UEFI db tables. 49 */ 50 __init efi_element_handler_t get_handler_for_db(const efi_guid_t *sig_type) 51 { 52 if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0) 53 return add_to_platform_keyring; 54 return NULL; 55 } 56 57 /* 58 * Return the appropriate handler for particular signature list types found in 59 * the MokListRT tables. 60 */ 61 __init efi_element_handler_t get_handler_for_mok(const efi_guid_t *sig_type) 62 { 63 if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0) { 64 if (IS_ENABLED(CONFIG_INTEGRITY_MACHINE_KEYRING) && 65 imputed_trust_enabled()) 66 return add_to_machine_keyring; 67 else 68 return add_to_platform_keyring; 69 } 70 return NULL; 71 } 72 73 __init efi_element_handler_t get_handler_for_ca_keys(const efi_guid_t *sig_type) 74 { 75 if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0) 76 return add_to_machine_keyring; 77 78 return NULL; 79 } 80 81 __init efi_element_handler_t get_handler_for_code_signing_keys(const efi_guid_t *sig_type) 82 { 83 if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0) 84 return add_to_secondary_keyring; 85 86 return NULL; 87 } 88 89 /* 90 * Return the appropriate handler for particular signature list types found in 91 * the UEFI dbx and MokListXRT tables. 92 */ 93 __init efi_element_handler_t get_handler_for_dbx(const efi_guid_t *sig_type) 94 { 95 if (efi_guidcmp(*sig_type, efi_cert_x509_sha256_guid) == 0) 96 return uefi_blacklist_x509_tbs; 97 if (efi_guidcmp(*sig_type, efi_cert_sha256_guid) == 0) 98 return uefi_blacklist_binary; 99 if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0) 100 return uefi_revocation_list_x509; 101 return NULL; 102 } 103