LXR linux/security/integrity/Kconfig

   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