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
137