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1 | # IBM Integrity Measurement Architecture |
2 | # | |
3 | config IMA | |
4 | bool "Integrity Measurement Architecture(IMA)" | |
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5 | select SECURITYFS |
6 | select CRYPTO | |
7 | select CRYPTO_HMAC | |
8 | select CRYPTO_MD5 | |
9 | select CRYPTO_SHA1 | |
c7c8bb23 | 10 | select CRYPTO_HASH_INFO |
f4a0391d | 11 | select TCG_TPM if HAS_IOMEM && !UML |
a69f1589 | 12 | select TCG_TIS if TCG_TPM && X86 |
20328b56 | 13 | select TCG_IBMVTPM if TCG_TPM && PPC64 |
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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 | ||
30 | config 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 | ||
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40 | config IMA_LSM_RULES |
41 | bool | |
b53fab9d | 42 | depends on IMA && AUDIT && (SECURITY_SELINUX || SECURITY_SMACK) |
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43 | default y |
44 | help | |
b53fab9d | 45 | Disabling this option will disregard LSM based policy rules. |
2fe5d6de | 46 | |
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47 | choice |
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)" | |
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64 | config IMA_SIG_TEMPLATE |
65 | bool "ima-sig" | |
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66 | endchoice |
67 | ||
68 | config IMA_DEFAULT_TEMPLATE | |
69 | string | |
70 | depends on IMA | |
71 | default "ima" if IMA_TEMPLATE | |
72 | default "ima-ng" if IMA_NG_TEMPLATE | |
bcbc9b0c | 73 | default "ima-sig" if IMA_SIG_TEMPLATE |
4286587d | 74 | |
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75 | choice |
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 | |
100 | endchoice | |
101 | ||
102 | config 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 | ||
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110 | config 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. | |
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124 | |
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 | |
129 | select KEYS_DEBUG_PROC_KEYS | |
130 | default y | |
131 | help | |
132 | This option requires that all keys added to the .ima | |
133 | keyring be signed by a key on the system trusted keyring. | |
fd5f4e90 DK |
134 | |
135 | config IMA_LOAD_X509 | |
136 | bool "Load X509 certificate onto the '.ima' trusted keyring" | |
137 | depends on IMA_TRUSTED_KEYRING | |
138 | default n | |
139 | help | |
140 | File signature verification is based on the public keys | |
141 | loaded on the .ima trusted keyring. These public keys are | |
142 | X509 certificates signed by a trusted key on the | |
143 | .system keyring. This option enables X509 certificate | |
144 | loading from the kernel onto the '.ima' trusted keyring. | |
145 | ||
146 | config IMA_X509_PATH | |
147 | string "IMA X509 certificate path" | |
148 | depends on IMA_LOAD_X509 | |
149 | default "/etc/keys/x509_ima.der" | |
150 | help | |
151 | This option defines IMA X509 certificate path. |