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 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 86endmenu 87