1# SPDX-License-Identifier: GPL-2.0-only 2# 3config INTEGRITY 4 bool "Integrity subsystem" 5 depends on SECURITY 6 default y 7 help 8 This option enables the integrity subsystem, which is comprised 9 of a number of different components including the Integrity 10 Measurement Architecture (IMA), Extended Verification Module 11 (EVM), IMA-appraisal extension, digital signature verification 12 extension and audit measurement log support. 13 14 Each of these components can be enabled/disabled separately. 15 Refer to the individual components for additional details. 16 17if INTEGRITY 18 19config INTEGRITY_SIGNATURE 20 bool "Digital signature verification using multiple keyrings" 21 default n 22 select KEYS 23 select SIGNATURE 24 help 25 This option enables digital signature verification support 26 using multiple keyrings. It defines separate keyrings for each 27 of the different use cases - evm, ima, and modules. 28 Different keyrings improves search performance, but also allow 29 to "lock" certain keyring to prevent adding new keys. 30 This is useful for evm and module keyrings, when keys are 31 usually only added from initramfs. 32 33config INTEGRITY_ASYMMETRIC_KEYS 34 bool "Enable asymmetric keys support" 35 depends on INTEGRITY_SIGNATURE 36 default n 37 select ASYMMETRIC_KEY_TYPE 38 select ASYMMETRIC_PUBLIC_KEY_SUBTYPE 39 select CRYPTO_RSA 40 select X509_CERTIFICATE_PARSER 41 help 42 This option enables digital signature verification using 43 asymmetric keys. 44 45config INTEGRITY_TRUSTED_KEYRING 46 bool "Require all keys on the integrity keyrings be signed" 47 depends on SYSTEM_TRUSTED_KEYRING 48 depends on INTEGRITY_ASYMMETRIC_KEYS 49 default y 50 help 51 This option requires that all keys added to the .ima and 52 .evm keyrings be signed by a key on the system trusted 53 keyring. 54 55config INTEGRITY_PLATFORM_KEYRING 56 bool "Provide keyring for platform/firmware trusted keys" 57 depends on INTEGRITY_ASYMMETRIC_KEYS 58 depends on SYSTEM_BLACKLIST_KEYRING 59 help 60 Provide a separate, distinct keyring for platform trusted keys, which 61 the kernel automatically populates during initialization from values 62 provided by the platform for verifying the kexec'ed kerned image 63 and, possibly, the initramfs signature. 64 65config INTEGRITY_MACHINE_KEYRING 66 bool "Provide a keyring to which Machine Owner Keys may be added" 67 depends on SECONDARY_TRUSTED_KEYRING 68 depends on INTEGRITY_ASYMMETRIC_KEYS 69 depends on SYSTEM_BLACKLIST_KEYRING 70 depends on LOAD_UEFI_KEYS 71 depends on !IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY 72 help 73 If set, provide a keyring to which Machine Owner Keys (MOK) may 74 be added. This keyring shall contain just MOK keys. Unlike keys 75 in the platform keyring, keys contained in the .machine keyring will 76 be trusted within the kernel. 77 78config LOAD_UEFI_KEYS 79 depends on INTEGRITY_PLATFORM_KEYRING 80 depends on EFI 81 def_bool y 82 83config LOAD_IPL_KEYS 84 depends on INTEGRITY_PLATFORM_KEYRING 85 depends on S390 86 def_bool y 87 88config LOAD_PPC_KEYS 89 bool "Enable loading of platform and blacklisted keys for POWER" 90 depends on INTEGRITY_PLATFORM_KEYRING 91 depends on PPC_SECURE_BOOT 92 default y 93 help 94 Enable loading of keys to the .platform keyring and blacklisted 95 hashes to the .blacklist keyring for powerpc based platforms. 96 97config INTEGRITY_AUDIT 98 bool "Enables integrity auditing support " 99 depends on AUDIT 100 default y 101 help 102 In addition to enabling integrity auditing support, this 103 option adds a kernel parameter 'integrity_audit', which 104 controls the level of integrity auditing messages. 105 0 - basic integrity auditing messages (default) 106 1 - additional integrity auditing messages 107 108 Additional informational integrity auditing messages would 109 be enabled by specifying 'integrity_audit=1' on the kernel 110 command line. 111 112source "security/integrity/ima/Kconfig" 113source "security/integrity/evm/Kconfig" 114 115endif # if INTEGRITY 116