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 67config 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 76config 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 85endmenu 86