1 # SPDX-License-Identifier: GPL-2.0-only 2 # 3 config 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 17 if INTEGRITY 18 19 config 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 33 config 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 45 config 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 55 config 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 65 config 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 help 72 If set, provide a keyring to which Machine Owner Keys (MOK) may 73 be added. This keyring shall contain just MOK keys. Unlike keys 74 in the platform keyring, keys contained in the .machine keyring will 75 be trusted within the kernel. 76 77 config INTEGRITY_CA_MACHINE_KEYRING 78 bool "Enforce Machine Keyring CA Restrictions" 79 depends on INTEGRITY_MACHINE_KEYRING 80 default n 81 help 82 The .machine keyring can be configured to enforce CA restriction 83 on any key added to it. By default no restrictions are in place 84 and all Machine Owner Keys (MOK) are added to the machine keyring. 85 If enabled only CA keys are added to the machine keyring, all 86 other MOK keys load into the platform keyring. 87 88 config INTEGRITY_CA_MACHINE_KEYRING_MAX 89 bool "Only CA keys without DigitialSignature usage set" 90 depends on INTEGRITY_CA_MACHINE_KEYRING 91 default n 92 help 93 When selected, only load CA keys are loaded into the machine 94 keyring that contain the CA bit set along with the keyCertSign 95 Usage field. Keys containing the digitialSignature Usage field 96 will not be loaded. The remaining MOK keys are loaded into the 97 .platform keyring. 98 99 config LOAD_UEFI_KEYS 100 depends on INTEGRITY_PLATFORM_KEYRING 101 depends on EFI 102 def_bool y 103 104 config LOAD_IPL_KEYS 105 depends on INTEGRITY_PLATFORM_KEYRING 106 depends on S390 107 def_bool y 108 109 config LOAD_PPC_KEYS 110 bool "Enable loading of platform and blacklisted keys for POWER" 111 depends on INTEGRITY_PLATFORM_KEYRING 112 depends on PPC_SECURE_BOOT 113 default y 114 help 115 Enable loading of keys to the .platform keyring and blacklisted 116 hashes to the .blacklist keyring for powerpc based platforms. 117 118 config INTEGRITY_AUDIT 119 bool "Enables integrity auditing support " 120 depends on AUDIT 121 default y 122 help 123 In addition to enabling integrity auditing support, this 124 option adds a kernel parameter 'integrity_audit', which 125 controls the level of integrity auditing messages. 126 0 - basic integrity auditing messages (default) 127 1 - additional integrity auditing messages 128 129 Additional informational integrity auditing messages would 130 be enabled by specifying 'integrity_audit=1' on the kernel 131 command line. 132 133 source "security/integrity/ima/Kconfig" 134 source "security/integrity/evm/Kconfig" 135 136 endif # if INTEGRITY 137