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 || LOAD_PPC_KEYS 71 select INTEGRITY_CA_MACHINE_KEYRING if LOAD_PPC_KEYS 72 select INTEGRITY_CA_MACHINE_KEYRING_MAX if LOAD_PPC_KEYS 73 help 74 If set, provide a keyring to which Machine Owner Keys (MOK) may 75 be added. This keyring shall contain just MOK keys. Unlike keys 76 in the platform keyring, keys contained in the .machine keyring will 77 be trusted within the kernel. 78 79config INTEGRITY_CA_MACHINE_KEYRING 80 bool "Enforce Machine Keyring CA Restrictions" 81 depends on INTEGRITY_MACHINE_KEYRING 82 default n 83 help 84 The .machine keyring can be configured to enforce CA restriction 85 on any key added to it. By default no restrictions are in place 86 and all Machine Owner Keys (MOK) are added to the machine keyring. 87 If enabled only CA keys are added to the machine keyring, all 88 other MOK keys load into the platform keyring. 89 90config INTEGRITY_CA_MACHINE_KEYRING_MAX 91 bool "Only CA keys without DigitialSignature usage set" 92 depends on INTEGRITY_CA_MACHINE_KEYRING 93 default n 94 help 95 When selected, only load CA keys are loaded into the machine 96 keyring that contain the CA bit set along with the keyCertSign 97 Usage field. Keys containing the digitialSignature Usage field 98 will not be loaded. The remaining MOK keys are loaded into the 99 .platform keyring. 100 101config LOAD_UEFI_KEYS 102 depends on INTEGRITY_PLATFORM_KEYRING 103 depends on EFI 104 def_bool y 105 106config LOAD_IPL_KEYS 107 depends on INTEGRITY_PLATFORM_KEYRING 108 depends on S390 109 def_bool y 110 111config LOAD_PPC_KEYS 112 bool "Enable loading of platform and blacklisted keys for POWER" 113 depends on INTEGRITY_PLATFORM_KEYRING 114 depends on PPC_SECURE_BOOT 115 default y 116 help 117 Enable loading of keys to the .platform keyring and blacklisted 118 hashes to the .blacklist keyring for powerpc based platforms. 119 120config INTEGRITY_AUDIT 121 bool "Enables integrity auditing support " 122 depends on AUDIT 123 default y 124 help 125 In addition to enabling integrity auditing support, this 126 option adds a kernel parameter 'integrity_audit', which 127 controls the level of integrity auditing messages. 128 0 - basic integrity auditing messages (default) 129 1 - additional integrity auditing messages 130 131 Additional informational integrity auditing messages would 132 be enabled by specifying 'integrity_audit=1' on the kernel 133 command line. 134 135source "security/integrity/ima/Kconfig" 136source "security/integrity/evm/Kconfig" 137 138endif # if INTEGRITY 139