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 || 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
 77config 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
 88config 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
 99config LOAD_UEFI_KEYS
100	depends on INTEGRITY_PLATFORM_KEYRING
101	depends on EFI
102	def_bool y
103
104config LOAD_IPL_KEYS
105	depends on INTEGRITY_PLATFORM_KEYRING
106	depends on S390
107	def_bool y
108
109config 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
118config 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
133source "security/integrity/ima/Kconfig"
134source "security/integrity/evm/Kconfig"
135
136endif   # if INTEGRITY