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	select INTEGRITY_CA_MACHINE_KEYRING if LOAD_PPC_KEYS
72	select INTEGRITY_CA_MACHINE_KEYRING_MAX if LOAD_PPC_KEYS
73	help
74	 If set, provide a keyring to which Machine Owner Keys (MOK) may
75	 be added. This keyring shall contain just MOK keys.  Unlike keys
76	 in the platform keyring, keys contained in the .machine keyring will
77	 be trusted within the kernel.
78
79config INTEGRITY_CA_MACHINE_KEYRING
80	bool "Enforce Machine Keyring CA Restrictions"
81	depends on INTEGRITY_MACHINE_KEYRING
82	default n
83	help
84	  The .machine keyring can be configured to enforce CA restriction
85	  on any key added to it.  By default no restrictions are in place
86	  and all Machine Owner Keys (MOK) are added to the machine keyring.
87	  If enabled only CA keys are added to the machine keyring, all
88	  other MOK keys load into the platform keyring.
89
90config INTEGRITY_CA_MACHINE_KEYRING_MAX
91	bool "Only CA keys without DigitialSignature usage set"
92	depends on INTEGRITY_CA_MACHINE_KEYRING
93	default n
94	help
95	  When selected, only load CA keys are loaded into the machine
96	  keyring that contain the CA bit set along with the keyCertSign
97	  Usage field.  Keys containing the digitialSignature Usage field
98	  will not be loaded. The remaining MOK keys are loaded into the
99	  .platform keyring.
100
101config LOAD_UEFI_KEYS
102       depends on INTEGRITY_PLATFORM_KEYRING
103       depends on EFI
104       def_bool y
105
106config LOAD_IPL_KEYS
107       depends on INTEGRITY_PLATFORM_KEYRING
108       depends on S390
109       def_bool y
110
111config LOAD_PPC_KEYS
112	bool "Enable loading of platform and blacklisted keys for POWER"
113	depends on INTEGRITY_PLATFORM_KEYRING
114	depends on PPC_SECURE_BOOT
115	default y
116	help
117	  Enable loading of keys to the .platform keyring and blacklisted
118	  hashes to the .blacklist keyring for powerpc based platforms.
119
120config INTEGRITY_AUDIT
121	bool "Enables integrity auditing support "
122	depends on AUDIT
123	default y
124	help
125	  In addition to enabling integrity auditing support, this
126	  option adds a kernel parameter 'integrity_audit', which
127	  controls the level of integrity auditing messages.
128	  0 - basic integrity auditing messages (default)
129	  1 - additional integrity auditing messages
130
131	  Additional informational integrity auditing messages would
132	  be enabled by specifying 'integrity_audit=1' on the kernel
133	  command line.
134
135source "security/integrity/ima/Kconfig"
136source "security/integrity/evm/Kconfig"
137
138endif   # if INTEGRITY
139