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
 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