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Kconfig��0000644��00000010103�14722052211�0006036 0��ustar�00��# SPDX-License-Identifier: GPL-2.0 menu "Certificates for signature checking" config MODULE_SIG_KEY string "File name or PKCS#11 URI of module signing key" default "certs/signing_key.pem" depends on MODULE_SIG help Provide the file name of a private key/certificate in PEM format, or a PKCS#11 URI according to RFC7512. The file should contain, or the URI should identify, both the certificate and its corresponding private key. If this option is unchanged from its default "certs/signing_key.pem", then the kernel will automatically generate the private key and certificate as described in Documentation/admin-guide/module-signing.rst config SYSTEM_TRUSTED_KEYRING bool "Provide system-wide ring of trusted keys" depends on KEYS depends on ASYMMETRIC_KEY_TYPE help Provide a system keyring to which trusted keys can be added. Keys in the keyring are considered to be trusted. Keys may be added at will by the kernel from compiled-in data and from hardware key stores, but userspace may only add extra keys if those keys can be verified by keys already in the keyring. Keys in this keyring are used by module signature checking. config SYSTEM_TRUSTED_KEYS string "Additional X.509 keys for default system keyring" depends on SYSTEM_TRUSTED_KEYRING help If set, this option should be the filename of a PEM-formatted file containing trusted X.509 certificates to be included in the default system keyring. Any certificate used for module signing is implicitly also trusted. NOTE: If you previously provided keys for the system keyring in the form of DER-encoded *.x509 files in the top-level build directory, those are no longer used. You will need to set this option instead. config SYSTEM_EXTRA_CERTIFICATE bool "Reserve area for inserting a certificate without recompiling" depends on SYSTEM_TRUSTED_KEYRING help If set, space for an extra certificate will be reserved in the kernel image. This allows introducing a trusted certificate to the default system keyring without recompiling the kernel. config SYSTEM_EXTRA_CERTIFICATE_SIZE int "Number of bytes to reserve for the extra certificate" depends on SYSTEM_EXTRA_CERTIFICATE default 4096 help This is the number of bytes reserved in the kernel image for a certificate to be inserted. config SECONDARY_TRUSTED_KEYRING bool "Provide a keyring to which extra trustable keys may be added" depends on SYSTEM_TRUSTED_KEYRING help If set, provide a keyring to which extra keys may be added, provided those keys are not blacklisted and are vouched for by a key built into the kernel or already in the secondary trusted keyring. config SYSTEM_BLACKLIST_KEYRING bool "Provide system-wide ring of blacklisted keys" depends on KEYS help Provide a system keyring to which blacklisted keys can be added. Keys in the keyring are considered entirely untrusted. Keys in this keyring are used by the module signature checking to reject loading of modules signed with a blacklisted key. config SYSTEM_BLACKLIST_HASH_LIST string "Hashes to be preloaded into the system blacklist keyring" depends on SYSTEM_BLACKLIST_KEYRING help If set, this option should be the filename of a list of hashes in the form "<hash>", "<hash>", ... . This will be included into a C wrapper to incorporate the list into the kernel. Each <hash> should be a string of hex digits. config SYSTEM_REVOCATION_LIST bool "Provide system-wide ring of revocation certificates" depends on SYSTEM_BLACKLIST_KEYRING depends on PKCS7_MESSAGE_PARSER=y help If set, this allows revocation certificates to be stored in the blacklist keyring and implements a hook whereby a PKCS#7 message can be checked to see if it matches such a certificate. config SYSTEM_REVOCATION_KEYS string "X.509 certificates to be preloaded into the system blacklist keyring" depends on SYSTEM_REVOCATION_LIST help If set, this option should be the filename of a PEM-formatted file containing X.509 certificates to be included in the default blacklist keyring. endmenu ��Makefile��0000644��00000011754�14722052211�0006210 0��ustar�00��# SPDX-License-Identifier: GPL-2.0 # # Makefile for the linux kernel signature checking certificates. # obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o common.o obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o common.o obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revocation_certificates.o ifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST),"") obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_hashes.o else obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_nohashes.o endif ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y) $(eval $(call config_filename,SYSTEM_TRUSTED_KEYS)) # GCC doesn't include .incbin files in -MD generated dependencies (PR#66871) $(obj)/system_certificates.o: $(obj)/x509_certificate_list # Cope with signing_key.x509 existing in $(srctree) not $(objtree) AFLAGS_system_certificates.o := -I$(srctree) quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2)) cmd_extract_certs = scripts/extract-cert $(2) $@ targets += x509_certificate_list $(obj)/x509_certificate_list: scripts/extract-cert $(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(SYSTEM_TRUSTED_KEYS_FILENAME) FORCE $(call if_changed,extract_certs,$(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_TRUSTED_KEYS)) endif # CONFIG_SYSTEM_TRUSTED_KEYRING clean-files := x509_certificate_list .x509.list x509_revocation_list ifeq ($(CONFIG_MODULE_SIG),y) ############################################################################### # # If module signing is requested, say by allyesconfig, but a key has not been # supplied, then one will need to be generated to make sure the build does not # fail and that the kernel may be used afterwards. # ############################################################################### ifndef CONFIG_MODULE_SIG_HASH $(error Could not determine digest type to use from kernel config) endif redirect_openssl = 2>&1 quiet_redirect_openssl = 2>&1 silent_redirect_openssl = 2>/dev/null openssl_available = $(shell openssl help 2>/dev/null && echo yes) # We do it this way rather than having a boolean option for enabling an # external private key, because 'make randconfig' might enable such a # boolean option and we unfortunately can't make it depend on !RANDCONFIG. ifeq ($(CONFIG_MODULE_SIG_KEY),"certs/signing_key.pem") ifeq ($(openssl_available),yes) X509TEXT=$(shell openssl x509 -in "certs/signing_key.pem" -text 2>/dev/null) $(if $(findstring rsaEncryption,$(X509TEXT)),,$(shell rm -f "certs/signing_key.pem")) endif $(obj)/signing_key.pem: $(obj)/x509.genkey @$(kecho) "###" @$(kecho) "### Now generating an X.509 key pair to be used for signing modules." @$(kecho) "###" @$(kecho) "### If this takes a long time, you might wish to run rngd in the" @$(kecho) "### background to keep the supply of entropy topped up. It" @$(kecho) "### needs to be run as root, and uses a hardware random" @$(kecho) "### number generator if one is available." @$(kecho) "###" $(Q)openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \ -batch -x509 -config $(obj)/x509.genkey \ -outform PEM -out $(obj)/signing_key.pem \ -keyout $(obj)/signing_key.pem \ $($(quiet)redirect_openssl) @$(kecho) "###" @$(kecho) "### Key pair generated." @$(kecho) "###" $(obj)/x509.genkey: @$(kecho) Generating X.509 key generation config @echo >$@ "[ req ]" @echo >>$@ "default_bits = 4096" @echo >>$@ "distinguished_name = req_distinguished_name" @echo >>$@ "prompt = no" @echo >>$@ "string_mask = utf8only" @echo >>$@ "x509_extensions = myexts" @echo >>$@ @echo >>$@ "[ req_distinguished_name ]" @echo >>$@ "#O = Unspecified company" @echo >>$@ "CN = Build time autogenerated kernel key" @echo >>$@ "#emailAddress = unspecified.user@unspecified.company" @echo >>$@ @echo >>$@ "[ myexts ]" @echo >>$@ "basicConstraints=critical,CA:FALSE" @echo >>$@ "keyUsage=digitalSignature" @echo >>$@ "subjectKeyIdentifier=hash" @echo >>$@ "authorityKeyIdentifier=keyid" endif # CONFIG_MODULE_SIG_KEY $(eval $(call config_filename,MODULE_SIG_KEY)) # If CONFIG_MODULE_SIG_KEY isn't a PKCS#11 URI, depend on it ifeq ($(patsubst pkcs11:%,%,$(firstword $(MODULE_SIG_KEY_FILENAME))),$(firstword $(MODULE_SIG_KEY_FILENAME))) X509_DEP := $(MODULE_SIG_KEY_SRCPREFIX)$(MODULE_SIG_KEY_FILENAME) endif # GCC PR#66871 again. $(obj)/system_certificates.o: $(obj)/signing_key.x509 targets += signing_key.x509 $(obj)/signing_key.x509: scripts/extract-cert $(X509_DEP) FORCE $(call if_changed,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY)) endif # CONFIG_MODULE_SIG ifeq ($(CONFIG_SYSTEM_REVOCATION_LIST),y) $(eval $(call config_filename,SYSTEM_REVOCATION_KEYS)) $(obj)/revocation_certificates.o: $(obj)/x509_revocation_list quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2)) cmd_extract_certs = scripts/extract-cert $(2) $@ targets += x509_revocation_list $(obj)/x509_revocation_list: scripts/extract-cert $(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(SYSTEM_REVOCATION_KEYS_FILENAME) FORCE $(call if_changed,extract_certs,$(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_REVOCATION_KEYS)) endif ��

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