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. 158