LXR linux/certs/Kconfig

   1menu "Certificates for signature checking"
   2
   3config MODULE_SIG_KEY
   4        string "File name or PKCS#11 URI of module signing key"
   5        default "certs/signing_key.pem"
   6        depends on MODULE_SIG
   7        help
   8         Provide the file name of a private key/certificate in PEM format,
   9         or a PKCS#11 URI according to RFC7512. The file should contain, or
  10         the URI should identify, both the certificate and its corresponding
  11         private key.
  12
  13         If this option is unchanged from its default "certs/signing_key.pem",
  14         then the kernel will automatically generate the private key and
  15         certificate as described in Documentation/module-signing.txt
  16
  17config SYSTEM_TRUSTED_KEYRING
  18        bool "Provide system-wide ring of trusted keys"
  19        depends on KEYS
  20        depends on ASYMMETRIC_KEY_TYPE
  21        help
  22          Provide a system keyring to which trusted keys can be added.  Keys in
  23          the keyring are considered to be trusted.  Keys may be added at will
  24          by the kernel from compiled-in data and from hardware key stores, but
  25          userspace may only add extra keys if those keys can be verified by
  26          keys already in the keyring.
  27
  28          Keys in this keyring are used by module signature checking.
  29
  30config SYSTEM_TRUSTED_KEYS
  31        string "Additional X.509 keys for default system keyring"
  32        depends on SYSTEM_TRUSTED_KEYRING
  33        help
  34          If set, this option should be the filename of a PEM-formatted file
  35          containing trusted X.509 certificates to be included in the default
  36          system keyring. Any certificate used for module signing is implicitly
  37          also trusted.
  38
  39          NOTE: If you previously provided keys for the system keyring in the
  40          form of DER-encoded *.x509 files in the top-level build directory,
  41          those are no longer used. You will need to set this option instead.
  42
  43config SYSTEM_EXTRA_CERTIFICATE
  44        bool "Reserve area for inserting a certificate without recompiling"
  45        depends on SYSTEM_TRUSTED_KEYRING
  46        help
  47          If set, space for an extra certificate will be reserved in the kernel
  48          image. This allows introducing a trusted certificate to the default
  49          system keyring without recompiling the kernel.
  50
  51config SYSTEM_EXTRA_CERTIFICATE_SIZE
  52        int "Number of bytes to reserve for the extra certificate"
  53        depends on SYSTEM_EXTRA_CERTIFICATE
  54        default 4096
  55        help
  56          This is the number of bytes reserved in the kernel image for a
  57          certificate to be inserted.
  58
  59config SECONDARY_TRUSTED_KEYRING
  60        bool "Provide a keyring to which extra trustable keys may be added"
  61        depends on SYSTEM_TRUSTED_KEYRING
  62        help
  63          If set, provide a keyring to which extra keys may be added, provided
  64          those keys are not blacklisted and are vouched for by a key built
  65          into the kernel or already in the secondary trusted keyring.
  66
  67endmenu
  68