78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Machine keyring routines.
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*
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* Copyright (c) 2021, Oracle and/or its affiliates.
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*/
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#include <linux/efi.h>
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#include "../integrity.h"
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static bool trust_mok;
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static __init int machine_keyring_init(void)
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{
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int rc;
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rc = integrity_init_keyring(INTEGRITY_KEYRING_MACHINE);
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if (rc)
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return rc;
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pr_notice("Machine keyring initialized\n");
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return 0;
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}
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device_initcall(machine_keyring_init);
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void __init add_to_machine_keyring(const char *source, const void *data, size_t len)
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{
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key_perm_t perm;
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int rc;
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perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW;
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rc = integrity_load_cert(INTEGRITY_KEYRING_MACHINE, source, data, len, perm);
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/*
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* Some MOKList keys may not pass the machine keyring restrictions.
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* If the restriction check does not pass and the platform keyring
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* is configured, try to add it into that keyring instead.
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*/
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if (rc && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING))
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rc = integrity_load_cert(INTEGRITY_KEYRING_PLATFORM, source,
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data, len, perm);
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if (rc)
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pr_info("Error adding keys to machine keyring %s\n", source);
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}
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/*
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* Try to load the MokListTrustedRT MOK variable to see if we should trust
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* the MOK keys within the kernel. It is not an error if this variable
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* does not exist. If it does not exist, MOK keys should not be trusted
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* within the machine keyring.
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*/
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static __init bool uefi_check_trust_mok_keys(void)
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{
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struct efi_mokvar_table_entry *mokvar_entry;
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mokvar_entry = efi_mokvar_entry_find("MokListTrustedRT");
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if (mokvar_entry)
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return true;
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return false;
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}
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bool __init trust_moklist(void)
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{
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static bool initialized;
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if (!initialized) {
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initialized = true;
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if (uefi_check_trust_mok_keys())
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trust_mok = true;
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}
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return trust_mok;
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}
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