92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/cred.h>
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#include <linux/err.h>
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#include <linux/efi.h>
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#include <linux/slab.h>
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#include <keys/asymmetric-type.h>
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#include <keys/system_keyring.h>
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#include "../integrity.h"
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static efi_guid_t efi_cert_x509_guid __initdata = EFI_CERT_X509_GUID;
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static efi_guid_t efi_cert_x509_sha256_guid __initdata =
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EFI_CERT_X509_SHA256_GUID;
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static efi_guid_t efi_cert_sha256_guid __initdata = EFI_CERT_SHA256_GUID;
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/*
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* Blacklist a hash.
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*/
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static __init void uefi_blacklist_hash(const char *source, const void *data,
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size_t len, const char *type,
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size_t type_len)
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{
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char *hash, *p;
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hash = kmalloc(type_len + len * 2 + 1, GFP_KERNEL);
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if (!hash)
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return;
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p = memcpy(hash, type, type_len);
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p += type_len;
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bin2hex(p, data, len);
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p += len * 2;
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*p = 0;
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mark_hash_blacklisted(hash);
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kfree(hash);
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}
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/*
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* Blacklist an X509 TBS hash.
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*/
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static __init void uefi_blacklist_x509_tbs(const char *source,
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const void *data, size_t len)
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{
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uefi_blacklist_hash(source, data, len, "tbs:", 4);
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}
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/*
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* Blacklist the hash of an executable.
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*/
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static __init void uefi_blacklist_binary(const char *source,
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const void *data, size_t len)
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{
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uefi_blacklist_hash(source, data, len, "bin:", 4);
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}
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/*
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* Add an X509 cert to the revocation list.
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*/
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static __init void uefi_revocation_list_x509(const char *source,
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const void *data, size_t len)
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{
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add_key_to_revocation_list(data, len);
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}
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/*
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* Return the appropriate handler for particular signature list types found in
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* the UEFI db and MokListRT tables.
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*/
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__init efi_element_handler_t get_handler_for_db(const efi_guid_t *sig_type)
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{
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if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0)
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return add_to_platform_keyring;
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return 0;
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}
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/*
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* Return the appropriate handler for particular signature list types found in
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* the UEFI dbx and MokListXRT tables.
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*/
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__init efi_element_handler_t get_handler_for_dbx(const efi_guid_t *sig_type)
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{
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if (efi_guidcmp(*sig_type, efi_cert_x509_sha256_guid) == 0)
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return uefi_blacklist_x509_tbs;
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if (efi_guidcmp(*sig_type, efi_cert_sha256_guid) == 0)
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return uefi_blacklist_binary;
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if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0)
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return uefi_revocation_list_x509;
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return 0;
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}
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