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 40 select CRYPTO_RSA 41 select X509_CERTIFICATE_PARSER 42 help 43 This option enables digital signature verification using 44 asymmetric keys. 45 46config INTEGRITY_TRUSTED_KEYRING 47 bool "Require all keys on the integrity keyrings be signed" 48 depends on SYSTEM_TRUSTED_KEYRING 49 depends on INTEGRITY_ASYMMETRIC_KEYS 50 default y 51 help 52 This option requires that all keys added to the .ima and 53 .evm keyrings be signed by a key on the system trusted 54 keyring. 55 56config INTEGRITY_PLATFORM_KEYRING 57 bool "Provide keyring for platform/firmware trusted keys" 58 depends on INTEGRITY_ASYMMETRIC_KEYS 59 depends on SYSTEM_BLACKLIST_KEYRING 60 help 61 Provide a separate, distinct keyring for platform trusted keys, which 62 the kernel automatically populates during initialization from values 63 provided by the platform for verifying the kexec'ed kerned image 64 and, possibly, the initramfs signature. 65 66config INTEGRITY_MACHINE_KEYRING 67 bool "Provide a keyring to which Machine Owner Keys may be added" 68 depends on SECONDARY_TRUSTED_KEYRING 69 depends on INTEGRITY_ASYMMETRIC_KEYS 70 depends on SYSTEM_BLACKLIST_KEYRING 71 depends on LOAD_UEFI_KEYS || LOAD_PPC_KEYS 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 INTEGRITY_CA_MACHINE_KEYRING 79 bool "Enforce Machine Keyring CA Restrictions" 80 depends on INTEGRITY_MACHINE_KEYRING 81 default n 82 help 83 The .machine keyring can be configured to enforce CA restriction 84 on any key added to it. By default no restrictions are in place 85 and all Machine Owner Keys (MOK) are added to the machine keyring. 86 If enabled only CA keys are added to the machine keyring, all 87 other MOK keys load into the platform keyring. 88 89config INTEGRITY_CA_MACHINE_KEYRING_MAX 90 bool "Only CA keys without DigitialSignature usage set" 91 depends on INTEGRITY_CA_MACHINE_KEYRING 92 default n 93 help 94 When selected, only load CA keys are loaded into the machine 95 keyring that contain the CA bit set along with the keyCertSign 96 Usage field. Keys containing the digitialSignature Usage field 97 will not be loaded. The remaining MOK keys are loaded into the 98 .platform keyring. 99 100config LOAD_UEFI_KEYS 101 depends on INTEGRITY_PLATFORM_KEYRING 102 depends on EFI 103 def_bool y 104 105config LOAD_IPL_KEYS 106 depends on INTEGRITY_PLATFORM_KEYRING 107 depends on S390 108 def_bool y 109 110config LOAD_PPC_KEYS 111 bool "Enable loading of platform and blacklisted keys for POWER" 112 depends on INTEGRITY_PLATFORM_KEYRING 113 depends on PPC_SECURE_BOOT 114 default y 115 help 116 Enable loading of keys to the .platform keyring and blacklisted 117 hashes to the .blacklist keyring for powerpc based platforms. 118 119config INTEGRITY_AUDIT 120 bool "Enables integrity auditing support " 121 depends on AUDIT 122 default y 123 help 124 In addition to enabling integrity auditing support, this 125 option adds a kernel parameter 'integrity_audit', which 126 controls the level of integrity auditing messages. 127 0 - basic integrity auditing messages (default) 128 1 - additional integrity auditing messages 129 130 Additional informational integrity auditing messages would 131 be enabled by specifying 'integrity_audit=1' on the kernel 132 command line. 133 134source "security/integrity/ima/Kconfig" 135source "security/integrity/evm/Kconfig" 136 137endif # if INTEGRITY 138