1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 config EVM 2 config EVM
3 bool "EVM support" 3 bool "EVM support"
4 select KEYS 4 select KEYS
5 select ENCRYPTED_KEYS 5 select ENCRYPTED_KEYS
6 select CRYPTO_HMAC 6 select CRYPTO_HMAC
7 select CRYPTO_SHA1 7 select CRYPTO_SHA1
8 select CRYPTO_HASH_INFO 8 select CRYPTO_HASH_INFO
9 select SECURITY_PATH <<
10 default n 9 default n
11 help 10 help
12 EVM protects a file's security exten 11 EVM protects a file's security extended attributes against
13 integrity attacks. 12 integrity attacks.
14 13
15 If you are unsure how to answer this 14 If you are unsure how to answer this question, answer N.
16 15
17 config EVM_ATTR_FSUUID 16 config EVM_ATTR_FSUUID
18 bool "FSUUID (version 2)" 17 bool "FSUUID (version 2)"
19 default y 18 default y
20 depends on EVM 19 depends on EVM
21 help 20 help
22 Include filesystem UUID for HMAC cal 21 Include filesystem UUID for HMAC calculation.
23 22
24 Default value is 'selected', which i 23 Default value is 'selected', which is former version 2.
25 if 'not selected', it is former vers 24 if 'not selected', it is former version 1
26 25
27 WARNING: changing the HMAC calculati 26 WARNING: changing the HMAC calculation method or adding
28 additional info to the calculation, 27 additional info to the calculation, requires existing EVM
29 labeled file systems to be relabeled 28 labeled file systems to be relabeled.
30 29
31 config EVM_EXTRA_SMACK_XATTRS 30 config EVM_EXTRA_SMACK_XATTRS
32 bool "Additional SMACK xattrs" 31 bool "Additional SMACK xattrs"
33 depends on EVM && SECURITY_SMACK 32 depends on EVM && SECURITY_SMACK
34 default n 33 default n
35 help 34 help
36 Include additional SMACK xattrs for 35 Include additional SMACK xattrs for HMAC calculation.
37 36
38 In addition to the original security 37 In addition to the original security xattrs (eg. security.selinux,
39 security.SMACK64, security.capabilit 38 security.SMACK64, security.capability, and security.ima) included
40 in the HMAC calculation, enabling th 39 in the HMAC calculation, enabling this option includes newly defined
41 Smack xattrs: security.SMACK64EXEC, 40 Smack xattrs: security.SMACK64EXEC, security.SMACK64TRANSMUTE and
42 security.SMACK64MMAP. 41 security.SMACK64MMAP.
43 42
44 WARNING: changing the HMAC calculati 43 WARNING: changing the HMAC calculation method or adding
45 additional info to the calculation, 44 additional info to the calculation, requires existing EVM
46 labeled file systems to be relabeled 45 labeled file systems to be relabeled.
47 46
48 config EVM_ADD_XATTRS 47 config EVM_ADD_XATTRS
49 bool "Add additional EVM extended attr 48 bool "Add additional EVM extended attributes at runtime"
50 depends on EVM 49 depends on EVM
51 default n 50 default n
52 help 51 help
53 Allow userland to provide additional 52 Allow userland to provide additional xattrs for HMAC calculation.
54 53
55 When this option is enabled, root ca 54 When this option is enabled, root can add additional xattrs to the
56 list used by EVM by writing them int 55 list used by EVM by writing them into
57 /sys/kernel/security/integrity/evm/e 56 /sys/kernel/security/integrity/evm/evm_xattrs.
58 57
59 config EVM_LOAD_X509 58 config EVM_LOAD_X509
60 bool "Load an X509 certificate onto th 59 bool "Load an X509 certificate onto the '.evm' trusted keyring"
61 depends on EVM && INTEGRITY_TRUSTED_KE 60 depends on EVM && INTEGRITY_TRUSTED_KEYRING
62 default n 61 default n
63 help 62 help
64 Load an X509 certificate onto the ' 63 Load an X509 certificate onto the '.evm' trusted keyring.
65 64
66 This option enables X509 certificat 65 This option enables X509 certificate loading from the kernel
67 onto the '.evm' trusted keyring. A 66 onto the '.evm' trusted keyring. A public key can be used to
68 verify EVM integrity starting from 67 verify EVM integrity starting from the 'init' process. The
69 key must have digitalSignature usag 68 key must have digitalSignature usage set.
70 69
71 config EVM_X509_PATH 70 config EVM_X509_PATH
72 string "EVM X509 certificate path" 71 string "EVM X509 certificate path"
73 depends on EVM_LOAD_X509 72 depends on EVM_LOAD_X509
74 default "/etc/keys/x509_evm.der" 73 default "/etc/keys/x509_evm.der"
75 help 74 help
76 This option defines X509 certificat 75 This option defines X509 certificate path.
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