security/integrity/evm/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 config EVM
   3         bool "EVM support"
   4         select KEYS
   5         select ENCRYPTED_KEYS
   6         select CRYPTO_HMAC
   7         select CRYPTO_SHA1
   8         select CRYPTO_HASH_INFO
   9         default n
  10         help
  11           EVM protects a file's security extended attributes against
  12           integrity attacks.
  13
  14           If you are unsure how to answer this question, answer N.
  15
  16 config EVM_ATTR_FSUUID
  17         bool "FSUUID (version 2)"
  18         default y
  19         depends on EVM
  20         help
  21           Include filesystem UUID for HMAC calculation.
  22
  23           Default value is 'selected', which is former version 2.
  24           if 'not selected', it is former version 1
  25
  26           WARNING: changing the HMAC calculation method or adding
  27           additional info to the calculation, requires existing EVM
  28           labeled file systems to be relabeled.
  29
  30 config EVM_EXTRA_SMACK_XATTRS
  31         bool "Additional SMACK xattrs"
  32         depends on EVM && SECURITY_SMACK
  33         default n
  34         help
  35           Include additional SMACK xattrs for HMAC calculation.
  36
  37           In addition to the original security xattrs (eg. security.selinux,
  38           security.SMACK64, security.capability, and security.ima) included
  39           in the HMAC calculation, enabling this option includes newly defined
  40           Smack xattrs: security.SMACK64EXEC, security.SMACK64TRANSMUTE and
  41           security.SMACK64MMAP.
  42
  43           WARNING: changing the HMAC calculation method or adding
  44           additional info to the calculation, requires existing EVM
  45           labeled file systems to be relabeled.
  46
  47 config EVM_ADD_XATTRS
  48         bool "Add additional EVM extended attributes at runtime"
  49         depends on EVM
  50         default n
  51         help
  52           Allow userland to provide additional xattrs for HMAC calculation.
  53
  54           When this option is enabled, root can add additional xattrs to the
  55           list used by EVM by writing them into
  56           /sys/kernel/security/integrity/evm/evm_xattrs.
  57
  58 config EVM_LOAD_X509
  59         bool "Load an X509 certificate onto the '.evm' trusted keyring"
  60         depends on EVM && INTEGRITY_TRUSTED_KEYRING
  61         default n
  62         help
  63            Load an X509 certificate onto the '.evm' trusted keyring.
  64
  65            This option enables X509 certificate loading from the kernel
  66            onto the '.evm' trusted keyring.  A public key can be used to
  67            verify EVM integrity starting from the 'init' process.
  68
  69 config EVM_X509_PATH
  70         string "EVM X509 certificate path"
  71         depends on EVM_LOAD_X509
  72         default "/etc/keys/x509_evm.der"
  73         help
  74            This option defines X509 certificate path.