linux/certs/Kconfig
<<
>>
Prefs
   1# SPDX-License-Identifier: GPL-2.0
   2menu "Certificates for signature checking"
   3
   4config MODULE_SIG_KEY
   5        string "File name or PKCS#11 URI of module signing key"
   6        default "certs/signing_key.pem"
   7        depends on MODULE_SIG || (IMA_APPRAISE_MODSIG && MODULES)
   8        help
   9         Provide the file name of a private key/certificate in PEM format,
  10         or a PKCS#11 URI according to RFC7512. The file should contain, or
  11         the URI should identify, both the certificate and its corresponding
  12         private key.
  13
  14         If this option is unchanged from its default "certs/signing_key.pem",
  15         then the kernel will automatically generate the private key and
  16         certificate as described in Documentation/admin-guide/module-signing.rst
  17
  18config SYSTEM_TRUSTED_KEYRING
  19        bool "Provide system-wide ring of trusted keys"
  20        depends on KEYS
  21        depends on ASYMMETRIC_KEY_TYPE
  22        help
  23          Provide a system keyring to which trusted keys can be added.  Keys in
  24          the keyring are considered to be trusted.  Keys may be added at will
  25          by the kernel from compiled-in data and from hardware key stores, but
  26          userspace may only add extra keys if those keys can be verified by
  27          keys already in the keyring.
  28
  29          Keys in this keyring are used by module signature checking.
  30
  31config SYSTEM_TRUSTED_KEYS
  32        string "Additional X.509 keys for default system keyring"
  33        depends on SYSTEM_TRUSTED_KEYRING
  34        help
  35          If set, this option should be the filename of a PEM-formatted file
  36          containing trusted X.509 certificates to be included in the default
  37          system keyring. Any certificate used for module signing is implicitly
  38          also trusted.
  39
  40          NOTE: If you previously provided keys for the system keyring in the
  41          form of DER-encoded *.x509 files in the top-level build directory,
  42          those are no longer used. You will need to set this option instead.
  43
  44config SYSTEM_EXTRA_CERTIFICATE
  45        bool "Reserve area for inserting a certificate without recompiling"
  46        depends on SYSTEM_TRUSTED_KEYRING
  47        help
  48          If set, space for an extra certificate will be reserved in the kernel
  49          image. This allows introducing a trusted certificate to the default
  50          system keyring without recompiling the kernel.
  51
  52config SYSTEM_EXTRA_CERTIFICATE_SIZE
  53        int "Number of bytes to reserve for the extra certificate"
  54        depends on SYSTEM_EXTRA_CERTIFICATE
  55        default 4096
  56        help
  57          This is the number of bytes reserved in the kernel image for a
  58          certificate to be inserted.
  59
  60config SECONDARY_TRUSTED_KEYRING
  61        bool "Provide a keyring to which extra trustable keys may be added"
  62        depends on SYSTEM_TRUSTED_KEYRING
  63        help
  64          If set, provide a keyring to which extra keys may be added, provided
  65          those keys are not blacklisted and are vouched for by a key built
  66          into the kernel or already in the secondary trusted keyring.
  67
  68config SYSTEM_BLACKLIST_KEYRING
  69        bool "Provide system-wide ring of blacklisted keys"
  70        depends on KEYS
  71        help
  72          Provide a system keyring to which blacklisted keys can be added.
  73          Keys in the keyring are considered entirely untrusted.  Keys in this
  74          keyring are used by the module signature checking to reject loading
  75          of modules signed with a blacklisted key.
  76
  77config SYSTEM_BLACKLIST_HASH_LIST
  78        string "Hashes to be preloaded into the system blacklist keyring"
  79        depends on SYSTEM_BLACKLIST_KEYRING
  80        help
  81          If set, this option should be the filename of a list of hashes in the
  82          form "<hash>", "<hash>", ... .  This will be included into a C
  83          wrapper to incorporate the list into the kernel.  Each <hash> should
  84          be a string of hex digits.
  85
  86config SYSTEM_REVOCATION_LIST
  87        bool "Provide system-wide ring of revocation certificates"
  88        depends on SYSTEM_BLACKLIST_KEYRING
  89        depends on PKCS7_MESSAGE_PARSER=y
  90        help
  91          If set, this allows revocation certificates to be stored in the
  92          blacklist keyring and implements a hook whereby a PKCS#7 message can
  93          be checked to see if it matches such a certificate.
  94
  95config SYSTEM_REVOCATION_KEYS
  96        string "X.509 certificates to be preloaded into the system blacklist keyring"
  97        depends on SYSTEM_REVOCATION_LIST
  98        help
  99          If set, this option should be the filename of a PEM-formatted file
 100          containing X.509 certificates to be included in the default blacklist
 101          keyring.
 102
 103endmenu
 104