1 # IBM Integrity Measurement Architecture
4 bool "Integrity Measurement Architecture(IMA)"
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
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.
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.
30 config IMA_MEASURE_PCR_IDX
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.
42 depends on IMA && AUDIT && (SECURITY_SELINUX || SECURITY_SMACK)
45 Disabling this option will disregard LSM based policy rules.
48 prompt "Default template"
49 default IMA_NG_TEMPLATE
52 Select the default IMA measurement template.
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
62 config IMA_NG_TEMPLATE
63 bool "ima-ng (default)"
64 config IMA_SIG_TEMPLATE
68 config IMA_DEFAULT_TEMPLATE
71 default "ima" if IMA_TEMPLATE
72 default "ima-ng" if IMA_NG_TEMPLATE
73 default "ima-sig" if IMA_SIG_TEMPLATE
76 prompt "Default integrity hash algorithm"
77 default IMA_DEFAULT_HASH_SHA1
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.
85 config IMA_DEFAULT_HASH_SHA1
87 depends on CRYPTO_SHA1
89 config IMA_DEFAULT_HASH_SHA256
91 depends on CRYPTO_SHA256 && !IMA_TEMPLATE
93 config IMA_DEFAULT_HASH_SHA512
95 depends on CRYPTO_SHA512 && !IMA_TEMPLATE
97 config IMA_DEFAULT_HASH_WP512
99 depends on CRYPTO_WP512 && !IMA_TEMPLATE
102 config IMA_DEFAULT_HASH
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
111 bool "Appraise integrity measurements"
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
121 For more information on integrity appraisal refer to:
122 <http://linux-ima.sourceforge.net>
125 config 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
131 This option requires that all keys added to the .ima
132 keyring be signed by a key on the system trusted keyring.
135 bool "Load X509 certificate onto the '.ima' trusted keyring"
136 depends on IMA_TRUSTED_KEYRING
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.
146 string "IMA X509 certificate path"
147 depends on IMA_LOAD_X509
148 default "/etc/keys/x509_ima.der"
150 This option defines IMA X509 certificate path.
152 config IMA_APPRAISE_SIGNED_INIT
153 bool "Require signed user-space initialization"
154 depends on IMA_LOAD_X509
157 This option requires user-space init to be signed.