certs/Kconfig

   1 menu "Certificates for signature checking"
   2
   3 config 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
  17 config 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
  30 config 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
  43 config 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
  51 config 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
  59 config 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
  67 config SYSTEM_BLACKLIST_KEYRING
  68         bool "Provide system-wide ring of blacklisted keys"
  69         depends on KEYS
  70         help
  71           Provide a system keyring to which blacklisted keys can be added.
  72           Keys in the keyring are considered entirely untrusted.  Keys in this
  73           keyring are used by the module signature checking to reject loading
  74           of modules signed with a blacklisted key.
  75
  76 config SYSTEM_BLACKLIST_HASH_LIST
  77         string "Hashes to be preloaded into the system blacklist keyring"
  78         depends on SYSTEM_BLACKLIST_KEYRING
  79         help
  80           If set, this option should be the filename of a list of hashes in the
  81           form "<hash>", "<hash>", ... .  This will be included into a C
  82           wrapper to incorporate the list into the kernel.  Each <hash> should
  83           be a string of hex digits.
  84
  85 endmenu