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Linux/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 PERSISTENT_KEYRINGS
 24         bool "Enable register of persistent per-UID keyrings"
 25         depends on KEYS
 26         help
 27           This option provides a register of persistent per-UID keyrings,
 28           primarily aimed at Kerberos key storage.  The keyrings are persistent
 29           in the sense that they stay around after all processes of that UID
 30           have exited, not that they survive the machine being rebooted.
 31 
 32           A particular keyring may be accessed by either the user whose keyring
 33           it is or by a process with administrative privileges.  The active
 34           LSMs gets to rule on which admin-level processes get to access the
 35           cache.
 36 
 37           Keyrings are created and added into the register upon demand and get
 38           removed if they expire (a default timeout is set upon creation).
 39 
 40 config BIG_KEYS
 41         bool "Large payload keys"
 42         depends on KEYS
 43         depends on TMPFS
 44         select CRYPTO
 45         select CRYPTO_AES
 46         select CRYPTO_ECB
 47         select CRYPTO_RNG
 48         help
 49           This option provides support for holding large keys within the kernel
 50           (for example Kerberos ticket caches).  The data may be stored out to
 51           swapspace by tmpfs.
 52 
 53           If you are unsure as to whether this is required, answer N.
 54 
 55 config TRUSTED_KEYS
 56         tristate "TRUSTED KEYS"
 57         depends on KEYS && TCG_TPM
 58         select CRYPTO
 59         select CRYPTO_HMAC
 60         select CRYPTO_SHA1
 61         select CRYPTO_HASH_INFO
 62         help
 63           This option provides support for creating, sealing, and unsealing
 64           keys in the kernel. Trusted keys are random number symmetric keys,
 65           generated and RSA-sealed by the TPM. The TPM only unseals the keys,
 66           if the boot PCRs and other criteria match.  Userspace will only ever
 67           see encrypted blobs.
 68 
 69           If you are unsure as to whether this is required, answer N.
 70 
 71 config ENCRYPTED_KEYS
 72         tristate "ENCRYPTED KEYS"
 73         depends on KEYS
 74         select CRYPTO
 75         select CRYPTO_HMAC
 76         select CRYPTO_AES
 77         select CRYPTO_CBC
 78         select CRYPTO_SHA256
 79         select CRYPTO_RNG
 80         help
 81           This option provides support for create/encrypting/decrypting keys
 82           in the kernel.  Encrypted keys are kernel generated random numbers,
 83           which are encrypted/decrypted with a 'master' symmetric key. The
 84           'master' key can be either a trusted-key or user-key type.
 85           Userspace only ever sees/stores encrypted blobs.
 86 
 87           If you are unsure as to whether this is required, answer N.
 88 
 89 config KEY_DH_OPERATIONS
 90        bool "Diffie-Hellman operations on retained keys"
 91        depends on KEYS
 92        select MPILIB
 93        help
 94          This option provides support for calculating Diffie-Hellman
 95          public keys and shared secrets using values stored as keys
 96          in the kernel.
 97 
 98          If you are unsure as to whether this is required, answer N.

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