security/keys/Kconfig

   1 #
   2 # Key management configuration
   3 #
   4
   5 config KEYS
   6         bool "Enable access key retention support"
   7         select ASSOCIATIVE_ARRAY
   8         help
   9           This option provides support for retaining authentication tokens and
  10           access keys in the kernel.
  11
  12           It also includes provision of methods by which such keys might be
  13           associated with a process so that network filesystems, encryption
  14           support and the like can find them.
  15
  16           Furthermore, a special type of key is available that acts as keyring:
  17           a searchable sequence of keys. Each process is equipped with access
  18           to five standard keyrings: UID-specific, GID-specific, session,
  19           process and thread.
  20
  21           If you are unsure as to whether this is required, answer N.
  22
  23 config TRUSTED_KEYS
  24         tristate "TRUSTED KEYS"
  25         depends on KEYS && TCG_TPM
  26         select CRYPTO
  27         select CRYPTO_HMAC
  28         select CRYPTO_SHA1
  29         help
  30           This option provides support for creating, sealing, and unsealing
  31           keys in the kernel. Trusted keys are random number symmetric keys,
  32           generated and RSA-sealed by the TPM. The TPM only unseals the keys,
  33           if the boot PCRs and other criteria match.  Userspace will only ever
  34           see encrypted blobs.
  35
  36           If you are unsure as to whether this is required, answer N.
  37
  38 config ENCRYPTED_KEYS
  39         tristate "ENCRYPTED KEYS"
  40         depends on KEYS
  41         select CRYPTO
  42         select CRYPTO_HMAC
  43         select CRYPTO_AES
  44         select CRYPTO_CBC
  45         select CRYPTO_SHA256
  46         select CRYPTO_RNG
  47         help
  48           This option provides support for create/encrypting/decrypting keys
  49           in the kernel.  Encrypted keys are kernel generated random numbers,
  50           which are encrypted/decrypted with a 'master' symmetric key. The
  51           'master' key can be either a trusted-key or user-key type.
  52           Userspace only ever sees/stores encrypted blobs.
  53
  54           If you are unsure as to whether this is required, answer N.
  55
  56 config KEYS_DEBUG_PROC_KEYS
  57         bool "Enable the /proc/keys file by which keys may be viewed"
  58         depends on KEYS
  59         help
  60           This option turns on support for the /proc/keys file - through which
  61           can be listed all the keys on the system that are viewable by the
  62           reading process.
  63
  64           The only keys included in the list are those that grant View
  65           permission to the reading process whether or not it possesses them.
  66           Note that LSM security checks are still performed, and may further
  67           filter out keys that the current process is not authorised to view.
  68
  69           Only key attributes are listed here; key payloads are not included in
  70           the resulting table.
  71
  72           If you are unsure as to whether this is required, answer N.