Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1# IBM Integrity Measurement Architecture
2#
3config IMA
4 bool "Integrity Measurement Architecture(IMA)"
5 select SECURITYFS
6 select CRYPTO
7 select CRYPTO_HMAC
8 select CRYPTO_MD5
9 select CRYPTO_SHA1
10 select CRYPTO_HASH_INFO
11 select TCG_TPM if HAS_IOMEM && !UML
12 select TCG_TIS if TCG_TPM && X86
13 select TCG_IBMVTPM if TCG_TPM && PPC_PSERIES
14 help
15 The Trusted Computing Group(TCG) runtime Integrity
16 Measurement Architecture(IMA) maintains a list of hash
17 values of executables and other sensitive system files,
18 as they are read or executed. If an attacker manages
19 to change the contents of an important system file
20 being measured, we can tell.
21
22 If your system has a TPM chip, then IMA also maintains
23 an aggregate integrity value over this list inside the
24 TPM hardware, so that the TPM can prove to a third party
25 whether or not critical system files have been modified.
26 Read <http://www.usenix.org/events/sec04/tech/sailer.html>
27 to learn more about IMA.
28 If unsure, say N.
29
30config IMA_MEASURE_PCR_IDX
31 int
32 depends on IMA
33 range 8 14
34 default 10
35 help
36 IMA_MEASURE_PCR_IDX determines the TPM PCR register index
37 that IMA uses to maintain the integrity aggregate of the
38 measurement list. If unsure, use the default 10.
39
40config IMA_LSM_RULES
41 bool
42 depends on IMA && AUDIT && (SECURITY_SELINUX || SECURITY_SMACK)
43 default y
44 help
45 Disabling this option will disregard LSM based policy rules.
46
47choice
48 prompt "Default template"
49 default IMA_NG_TEMPLATE
50 depends on IMA
51 help
52 Select the default IMA measurement template.
53
54 The original 'ima' measurement list template contains a
55 hash, defined as 20 bytes, and a null terminated pathname,
56 limited to 255 characters. The 'ima-ng' measurement list
57 template permits both larger hash digests and longer
58 pathnames.
59
60 config IMA_TEMPLATE
61 bool "ima"
62 config IMA_NG_TEMPLATE
63 bool "ima-ng (default)"
64 config IMA_SIG_TEMPLATE
65 bool "ima-sig"
66endchoice
67
68config IMA_DEFAULT_TEMPLATE
69 string
70 depends on IMA
71 default "ima" if IMA_TEMPLATE
72 default "ima-ng" if IMA_NG_TEMPLATE
73 default "ima-sig" if IMA_SIG_TEMPLATE
74
75choice
76 prompt "Default integrity hash algorithm"
77 default IMA_DEFAULT_HASH_SHA1
78 depends on IMA
79 help
80 Select the default hash algorithm used for the measurement
81 list, integrity appraisal and audit log. The compiled default
82 hash algorithm can be overwritten using the kernel command
83 line 'ima_hash=' option.
84
85 config IMA_DEFAULT_HASH_SHA1
86 bool "SHA1 (default)"
87 depends on CRYPTO_SHA1
88
89 config IMA_DEFAULT_HASH_SHA256
90 bool "SHA256"
91 depends on CRYPTO_SHA256 && !IMA_TEMPLATE
92
93 config IMA_DEFAULT_HASH_SHA512
94 bool "SHA512"
95 depends on CRYPTO_SHA512 && !IMA_TEMPLATE
96
97 config IMA_DEFAULT_HASH_WP512
98 bool "WP512"
99 depends on CRYPTO_WP512 && !IMA_TEMPLATE
100endchoice
101
102config IMA_DEFAULT_HASH
103 string
104 depends on IMA
105 default "sha1" if IMA_DEFAULT_HASH_SHA1
106 default "sha256" if IMA_DEFAULT_HASH_SHA256
107 default "sha512" if IMA_DEFAULT_HASH_SHA512
108 default "wp512" if IMA_DEFAULT_HASH_WP512
109
110config IMA_APPRAISE
111 bool "Appraise integrity measurements"
112 depends on IMA
113 default n
114 help
115 This option enables local measurement integrity appraisal.
116 It requires the system to be labeled with a security extended
117 attribute containing the file hash measurement. To protect
118 the security extended attributes from offline attack, enable
119 and configure EVM.
120
121 For more information on integrity appraisal refer to:
122 <http://linux-ima.sourceforge.net>
123 If unsure, say N.
124
125config IMA_TRUSTED_KEYRING
126 bool "Require all keys on the .ima keyring be signed"
127 depends on IMA_APPRAISE && SYSTEM_TRUSTED_KEYRING
128 depends on INTEGRITY_ASYMMETRIC_KEYS
129 default y
130 help
131 This option requires that all keys added to the .ima
132 keyring be signed by a key on the system trusted keyring.
133
134config IMA_LOAD_X509
135 bool "Load X509 certificate onto the '.ima' trusted keyring"
136 depends on IMA_TRUSTED_KEYRING
137 default n
138 help
139 File signature verification is based on the public keys
140 loaded on the .ima trusted keyring. These public keys are
141 X509 certificates signed by a trusted key on the
142 .system keyring. This option enables X509 certificate
143 loading from the kernel onto the '.ima' trusted keyring.
144
145config IMA_X509_PATH
146 string "IMA X509 certificate path"
147 depends on IMA_LOAD_X509
148 default "/etc/keys/x509_ima.der"
149 help
150 This option defines IMA X509 certificate path.
151
152config IMA_APPRAISE_SIGNED_INIT
153 bool "Require signed user-space initialization"
154 depends on IMA_LOAD_X509
155 default n
156 help
157 This option requires user-space init to be signed.