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