security/integrity/ima/Kconfig

   1 # IBM Integrity Measurement Architecture
   2 #
   3 config 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_CRB if TCG_TPM && ACPI
  14         select TCG_IBMVTPM if TCG_TPM && PPC_PSERIES
  15         help
  16           The Trusted Computing Group(TCG) runtime Integrity
  17           Measurement Architecture(IMA) maintains a list of hash
  18           values of executables and other sensitive system files,
  19           as they are read or executed. If an attacker manages
  20           to change the contents of an important system file
  21           being measured, we can tell.
  22
  23           If your system has a TPM chip, then IMA also maintains
  24           an aggregate integrity value over this list inside the
  25           TPM hardware, so that the TPM can prove to a third party
  26           whether or not critical system files have been modified.
  27           Read <http://www.usenix.org/events/sec04/tech/sailer.html>
  28           to learn more about IMA.
  29           If unsure, say N.
  30
  31 config IMA_KEXEC
  32         bool "Enable carrying the IMA measurement list across a soft boot"
  33         depends on IMA && TCG_TPM && HAVE_IMA_KEXEC
  34         default n
  35         help
  36            TPM PCRs are only reset on a hard reboot.  In order to validate
  37            a TPM's quote after a soft boot, the IMA measurement list of the
  38            running kernel must be saved and restored on boot.
  39
  40            Depending on the IMA policy, the measurement list can grow to
  41            be very large.
  42
  43 config IMA_MEASURE_PCR_IDX
  44         int
  45         depends on IMA
  46         range 8 14
  47         default 10
  48         help
  49           IMA_MEASURE_PCR_IDX determines the TPM PCR register index
  50           that IMA uses to maintain the integrity aggregate of the
  51           measurement list.  If unsure, use the default 10.
  52
  53 config IMA_LSM_RULES
  54         bool
  55         depends on IMA && AUDIT && (SECURITY_SELINUX || SECURITY_SMACK)
  56         default y
  57         help
  58           Disabling this option will disregard LSM based policy rules.
  59
  60 choice
  61         prompt "Default template"
  62         default IMA_NG_TEMPLATE
  63         depends on IMA
  64         help
  65           Select the default IMA measurement template.
  66
  67           The original 'ima' measurement list template contains a
  68           hash, defined as 20 bytes, and a null terminated pathname,
  69           limited to 255 characters.  The 'ima-ng' measurement list
  70           template permits both larger hash digests and longer
  71           pathnames.
  72
  73         config IMA_TEMPLATE
  74                 bool "ima"
  75         config IMA_NG_TEMPLATE
  76                 bool "ima-ng (default)"
  77         config IMA_SIG_TEMPLATE
  78                 bool "ima-sig"
  79 endchoice
  80
  81 config IMA_DEFAULT_TEMPLATE
  82         string
  83         depends on IMA
  84         default "ima" if IMA_TEMPLATE
  85         default "ima-ng" if IMA_NG_TEMPLATE
  86         default "ima-sig" if IMA_SIG_TEMPLATE
  87
  88 choice
  89         prompt "Default integrity hash algorithm"
  90         default IMA_DEFAULT_HASH_SHA1
  91         depends on IMA
  92         help
  93            Select the default hash algorithm used for the measurement
  94            list, integrity appraisal and audit log.  The compiled default
  95            hash algorithm can be overwritten using the kernel command
  96            line 'ima_hash=' option.
  97
  98         config IMA_DEFAULT_HASH_SHA1
  99                 bool "SHA1 (default)"
 100                 depends on CRYPTO_SHA1=y
 101
 102         config IMA_DEFAULT_HASH_SHA256
 103                 bool "SHA256"
 104                 depends on CRYPTO_SHA256=y && !IMA_TEMPLATE
 105
 106         config IMA_DEFAULT_HASH_SHA512
 107                 bool "SHA512"
 108                 depends on CRYPTO_SHA512=y && !IMA_TEMPLATE
 109
 110         config IMA_DEFAULT_HASH_WP512
 111                 bool "WP512"
 112                 depends on CRYPTO_WP512=y && !IMA_TEMPLATE
 113 endchoice
 114
 115 config IMA_DEFAULT_HASH
 116         string
 117         depends on IMA
 118         default "sha1" if IMA_DEFAULT_HASH_SHA1
 119         default "sha256" if IMA_DEFAULT_HASH_SHA256
 120         default "sha512" if IMA_DEFAULT_HASH_SHA512
 121         default "wp512" if IMA_DEFAULT_HASH_WP512
 122
 123 config IMA_WRITE_POLICY
 124         bool "Enable multiple writes to the IMA policy"
 125         depends on IMA
 126         default n
 127         help
 128           IMA policy can now be updated multiple times.  The new rules get
 129           appended to the original policy.  Have in mind that the rules are
 130           scanned in FIFO order so be careful when you design and add new ones.
 131
 132           If unsure, say N.
 133
 134 config IMA_READ_POLICY
 135         bool "Enable reading back the current IMA policy"
 136         depends on IMA
 137         default y if IMA_WRITE_POLICY
 138         default n if !IMA_WRITE_POLICY
 139         help
 140            It is often useful to be able to read back the IMA policy.  It is
 141            even more important after introducing CONFIG_IMA_WRITE_POLICY.
 142            This option allows the root user to see the current policy rules.
 143
 144 config IMA_APPRAISE
 145         bool "Appraise integrity measurements"
 146         depends on IMA
 147         default n
 148         help
 149           This option enables local measurement integrity appraisal.
 150           It requires the system to be labeled with a security extended
 151           attribute containing the file hash measurement.  To protect
 152           the security extended attributes from offline attack, enable
 153           and configure EVM.
 154
 155           For more information on integrity appraisal refer to:
 156           <http://linux-ima.sourceforge.net>
 157           If unsure, say N.
 158
 159 config IMA_APPRAISE_BOOTPARAM
 160         bool "ima_appraise boot parameter"
 161         depends on IMA_APPRAISE
 162         default y
 163         help
 164           This option enables the different "ima_appraise=" modes
 165           (eg. fix, log) from the boot command line.
 166
 167 config IMA_TRUSTED_KEYRING
 168         bool "Require all keys on the .ima keyring be signed (deprecated)"
 169         depends on IMA_APPRAISE && SYSTEM_TRUSTED_KEYRING
 170         depends on INTEGRITY_ASYMMETRIC_KEYS
 171         select INTEGRITY_TRUSTED_KEYRING
 172         default y
 173         help
 174            This option requires that all keys added to the .ima
 175            keyring be signed by a key on the system trusted keyring.
 176
 177            This option is deprecated in favor of INTEGRITY_TRUSTED_KEYRING
 178
 179 config IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
 180         bool "Permit keys validly signed by a built-in or secondary CA cert (EXPERIMENTAL)"
 181         depends on SYSTEM_TRUSTED_KEYRING
 182         depends on SECONDARY_TRUSTED_KEYRING
 183         depends on INTEGRITY_ASYMMETRIC_KEYS
 184         select INTEGRITY_TRUSTED_KEYRING
 185         default n
 186         help
 187           Keys may be added to the IMA or IMA blacklist keyrings, if the
 188           key is validly signed by a CA cert in the system built-in or
 189           secondary trusted keyrings.
 190
 191           Intermediate keys between those the kernel has compiled in and the
 192           IMA keys to be added may be added to the system secondary keyring,
 193           provided they are validly signed by a key already resident in the
 194           built-in or secondary trusted keyrings.
 195
 196 config IMA_BLACKLIST_KEYRING
 197         bool "Create IMA machine owner blacklist keyrings (EXPERIMENTAL)"
 198         depends on SYSTEM_TRUSTED_KEYRING
 199         depends on IMA_TRUSTED_KEYRING
 200         default n
 201         help
 202            This option creates an IMA blacklist keyring, which contains all
 203            revoked IMA keys.  It is consulted before any other keyring.  If
 204            the search is successful the requested operation is rejected and
 205            an error is returned to the caller.
 206
 207 config IMA_LOAD_X509
 208         bool "Load X509 certificate onto the '.ima' trusted keyring"
 209         depends on IMA_TRUSTED_KEYRING
 210         default n
 211         help
 212            File signature verification is based on the public keys
 213            loaded on the .ima trusted keyring. These public keys are
 214            X509 certificates signed by a trusted key on the
 215            .system keyring.  This option enables X509 certificate
 216            loading from the kernel onto the '.ima' trusted keyring.
 217
 218 config IMA_X509_PATH
 219         string "IMA X509 certificate path"
 220         depends on IMA_LOAD_X509
 221         default "/etc/keys/x509_ima.der"
 222         help
 223            This option defines IMA X509 certificate path.
 224
 225 config IMA_APPRAISE_SIGNED_INIT
 226         bool "Require signed user-space initialization"
 227         depends on IMA_LOAD_X509
 228         default n
 229         help
 230            This option requires user-space init to be signed.