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        help
  21          Provide a system keyring to which trusted keys can be added.  Keys in
  22          the keyring are considered to be trusted.  Keys may be added at will
  23          by the kernel from compiled-in data and from hardware key stores, but
  24          userspace may only add extra keys if those keys can be verified by
  25          keys already in the keyring.
  26
  27          Keys in this keyring are used by module signature checking.
  28
  29config SYSTEM_TRUSTED_KEYS
  30        string "Additional X.509 keys for default system keyring"
  31        depends on SYSTEM_TRUSTED_KEYRING
  32        help
  33          If set, this option should be the filename of a PEM-formatted file
  34          containing trusted X.509 certificates to be included in the default
  35          system keyring. Any certificate used for module signing is implicitly
  36          also trusted.
  37
  38          NOTE: If you previously provided keys for the system keyring in the
  39          form of DER-encoded *.x509 files in the top-level build directory,
  40          those are no longer used. You will need to set this option instead.
  41
  42config SYSTEM_EXTRA_CERTIFICATE
  43        bool "Reserve area for inserting a certificate without recompiling"
  44        depends on SYSTEM_TRUSTED_KEYRING
  45        help
  46          If set, space for an extra certificate will be reserved in the kernel
  47          image. This allows introducing a trusted certificate to the default
  48          system keyring without recompiling the kernel.
  49
  50config SYSTEM_EXTRA_CERTIFICATE_SIZE
  51        int "Number of bytes to reserve for the extra certificate"
  52        depends on SYSTEM_EXTRA_CERTIFICATE
  53        default 4096
  54        help
  55          This is the number of bytes reserved in the kernel image for a
  56          certificate to be inserted.
  57
  58endmenu
  59