security/integrity/Kconfig

   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 LOAD_UEFI_KEYS
  66        depends on INTEGRITY_PLATFORM_KEYRING
  67        depends on EFI
  68        def_bool y
  69
  70 config LOAD_IPL_KEYS
  71        depends on INTEGRITY_PLATFORM_KEYRING
  72        depends on S390
  73        def_bool y
  74
  75 config LOAD_PPC_KEYS
  76         bool "Enable loading of platform and blacklisted keys for POWER"
  77         depends on INTEGRITY_PLATFORM_KEYRING
  78         depends on PPC_SECURE_BOOT
  79         default y
  80         help
  81           Enable loading of keys to the .platform keyring and blacklisted
  82           hashes to the .blacklist keyring for powerpc based platforms.
  83
  84 config INTEGRITY_AUDIT
  85         bool "Enables integrity auditing support "
  86         depends on AUDIT
  87         default y
  88         help
  89           In addition to enabling integrity auditing support, this
  90           option adds a kernel parameter 'integrity_audit', which
  91           controls the level of integrity auditing messages.
  92           0 - basic integrity auditing messages (default)
  93           1 - additional integrity auditing messages
  94
  95           Additional informational integrity auditing messages would
  96           be enabled by specifying 'integrity_audit=1' on the kernel
  97           command line.
  98
  99 source "security/integrity/ima/Kconfig"
 100 source "security/integrity/evm/Kconfig"
 101
 102 endif   # if INTEGRITY