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