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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         help
 45           This option provides support for holding large keys within the kernel
 46           (for example Kerberos ticket caches).  The data may be stored out to
 47           swapspace by tmpfs.
 48 
 49           If you are unsure as to whether this is required, answer N.
 50 
 51 config TRUSTED_KEYS
 52         tristate "TRUSTED KEYS"
 53         depends on KEYS && TCG_TPM
 54         select CRYPTO
 55         select CRYPTO_HMAC
 56         select CRYPTO_SHA1
 57         help
 58           This option provides support for creating, sealing, and unsealing
 59           keys in the kernel. Trusted keys are random number symmetric keys,
 60           generated and RSA-sealed by the TPM. The TPM only unseals the keys,
 61           if the boot PCRs and other criteria match.  Userspace will only ever
 62           see encrypted blobs.
 63 
 64           If you are unsure as to whether this is required, answer N.
 65 
 66 config ENCRYPTED_KEYS
 67         tristate "ENCRYPTED KEYS"
 68         depends on KEYS
 69         select CRYPTO
 70         select CRYPTO_HMAC
 71         select CRYPTO_AES
 72         select CRYPTO_CBC
 73         select CRYPTO_SHA256
 74         select CRYPTO_RNG
 75         help
 76           This option provides support for create/encrypting/decrypting keys
 77           in the kernel.  Encrypted keys are kernel generated random numbers,
 78           which are encrypted/decrypted with a 'master' symmetric key. The
 79           'master' key can be either a trusted-key or user-key type.
 80           Userspace only ever sees/stores encrypted blobs.
 81 
 82           If you are unsure as to whether this is required, answer N.
 83 
 84 config KEYS_DEBUG_PROC_KEYS
 85         bool "Enable the /proc/keys file by which keys may be viewed"
 86         depends on KEYS
 87         help
 88           This option turns on support for the /proc/keys file - through which
 89           can be listed all the keys on the system that are viewable by the
 90           reading process.
 91 
 92           The only keys included in the list are those that grant View
 93           permission to the reading process whether or not it possesses them.
 94           Note that LSM security checks are still performed, and may further
 95           filter out keys that the current process is not authorised to view.
 96 
 97           Only key attributes are listed here; key payloads are not included in
 98           the resulting table.
 99 
100           If you are unsure as to whether this is required, answer N.

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