Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
// 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 __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 && efi_enabled(EFI_BOOT) &&
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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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static bool __init trust_moklist(void)
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{
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static bool initialized;
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static bool trust_mok;
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if (!initialized) {
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initialized = true;
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trust_mok = false;
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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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/*
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* Provides platform specific check for trusting imputed keys before loading
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* on .machine keyring. UEFI systems enable this trust based on a variable,
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* and for other platforms, it is always enabled.
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*/
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bool __init imputed_trust_enabled(void)
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{
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if (efi_enabled(EFI_BOOT))
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return trust_moklist();
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return true;
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}
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