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91 lines
2.3 KiB
91 lines
2.3 KiB
// 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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