Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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