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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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a4aed36ed5
Add support for using elliptic curve keys for signing modules. It uses a NIST P384 (secp384r1) key if the user chooses an elliptic curve key and will have ECDSA support built into the kernel. Note: A developer choosing an ECDSA key for signing modules should still delete the signing key (rm certs/signing_key.*) when building an older version of a kernel that only supports RSA keys. Unless kbuild automati- cally detects and generates a new kernel module key, ECDSA-signed kernel modules will fail signature verification. Cc: David Howells <dhowells@redhat.com> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Tested-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
153 lines
5.5 KiB
Makefile
153 lines
5.5 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for the linux kernel signature checking certificates.
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#
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obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o common.o
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obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o common.o
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obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revocation_certificates.o
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ifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST),"")
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obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_hashes.o
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else
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obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_nohashes.o
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endif
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ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y)
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$(eval $(call config_filename,SYSTEM_TRUSTED_KEYS))
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# GCC doesn't include .incbin files in -MD generated dependencies (PR#66871)
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$(obj)/system_certificates.o: $(obj)/x509_certificate_list
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# Cope with signing_key.x509 existing in $(srctree) not $(objtree)
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AFLAGS_system_certificates.o := -I$(srctree)
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quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2))
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cmd_extract_certs = scripts/extract-cert $(2) $@
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targets += x509_certificate_list
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$(obj)/x509_certificate_list: scripts/extract-cert $(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(SYSTEM_TRUSTED_KEYS_FILENAME) FORCE
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$(call if_changed,extract_certs,$(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_TRUSTED_KEYS))
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endif # CONFIG_SYSTEM_TRUSTED_KEYRING
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clean-files := x509_certificate_list .x509.list x509_revocation_list
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ifeq ($(CONFIG_MODULE_SIG),y)
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SIGN_KEY = y
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endif
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ifeq ($(CONFIG_IMA_APPRAISE_MODSIG),y)
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ifeq ($(CONFIG_MODULES),y)
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SIGN_KEY = y
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endif
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endif
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ifdef SIGN_KEY
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###############################################################################
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#
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# If module signing is requested, say by allyesconfig, but a key has not been
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# supplied, then one will need to be generated to make sure the build does not
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# fail and that the kernel may be used afterwards.
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#
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###############################################################################
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ifndef CONFIG_MODULE_SIG_HASH
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$(error Could not determine digest type to use from kernel config)
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endif
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redirect_openssl = 2>&1
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quiet_redirect_openssl = 2>&1
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silent_redirect_openssl = 2>/dev/null
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openssl_available = $(shell openssl help 2>/dev/null && echo yes)
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# We do it this way rather than having a boolean option for enabling an
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# external private key, because 'make randconfig' might enable such a
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# boolean option and we unfortunately can't make it depend on !RANDCONFIG.
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ifeq ($(CONFIG_MODULE_SIG_KEY),"certs/signing_key.pem")
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ifeq ($(openssl_available),yes)
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X509TEXT=$(shell openssl x509 -in "certs/signing_key.pem" -text 2>/dev/null)
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endif
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# Support user changing key type
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ifdef CONFIG_MODULE_SIG_KEY_TYPE_ECDSA
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keytype_openssl = -newkey ec -pkeyopt ec_paramgen_curve:secp384r1
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ifeq ($(openssl_available),yes)
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$(if $(findstring id-ecPublicKey,$(X509TEXT)),,$(shell rm -f "certs/signing_key.pem"))
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endif
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endif # CONFIG_MODULE_SIG_KEY_TYPE_ECDSA
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ifdef CONFIG_MODULE_SIG_KEY_TYPE_RSA
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ifeq ($(openssl_available),yes)
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$(if $(findstring rsaEncryption,$(X509TEXT)),,$(shell rm -f "certs/signing_key.pem"))
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endif
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endif # CONFIG_MODULE_SIG_KEY_TYPE_RSA
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$(obj)/signing_key.pem: $(obj)/x509.genkey
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@$(kecho) "###"
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@$(kecho) "### Now generating an X.509 key pair to be used for signing modules."
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@$(kecho) "###"
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@$(kecho) "### If this takes a long time, you might wish to run rngd in the"
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@$(kecho) "### background to keep the supply of entropy topped up. It"
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@$(kecho) "### needs to be run as root, and uses a hardware random"
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@$(kecho) "### number generator if one is available."
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@$(kecho) "###"
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$(Q)openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
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-batch -x509 -config $(obj)/x509.genkey \
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-outform PEM -out $(obj)/signing_key.pem \
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-keyout $(obj)/signing_key.pem \
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$(keytype_openssl) \
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$($(quiet)redirect_openssl)
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@$(kecho) "###"
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@$(kecho) "### Key pair generated."
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@$(kecho) "###"
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$(obj)/x509.genkey:
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@$(kecho) Generating X.509 key generation config
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@echo >$@ "[ req ]"
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@echo >>$@ "default_bits = 4096"
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@echo >>$@ "distinguished_name = req_distinguished_name"
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@echo >>$@ "prompt = no"
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@echo >>$@ "string_mask = utf8only"
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@echo >>$@ "x509_extensions = myexts"
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@echo >>$@
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@echo >>$@ "[ req_distinguished_name ]"
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@echo >>$@ "#O = Unspecified company"
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@echo >>$@ "CN = Build time autogenerated kernel key"
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@echo >>$@ "#emailAddress = unspecified.user@unspecified.company"
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@echo >>$@
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@echo >>$@ "[ myexts ]"
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@echo >>$@ "basicConstraints=critical,CA:FALSE"
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@echo >>$@ "keyUsage=digitalSignature"
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@echo >>$@ "subjectKeyIdentifier=hash"
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@echo >>$@ "authorityKeyIdentifier=keyid"
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endif # CONFIG_MODULE_SIG_KEY
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$(eval $(call config_filename,MODULE_SIG_KEY))
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# If CONFIG_MODULE_SIG_KEY isn't a PKCS#11 URI, depend on it
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ifeq ($(patsubst pkcs11:%,%,$(firstword $(MODULE_SIG_KEY_FILENAME))),$(firstword $(MODULE_SIG_KEY_FILENAME)))
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X509_DEP := $(MODULE_SIG_KEY_SRCPREFIX)$(MODULE_SIG_KEY_FILENAME)
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endif
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# GCC PR#66871 again.
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$(obj)/system_certificates.o: $(obj)/signing_key.x509
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targets += signing_key.x509
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$(obj)/signing_key.x509: scripts/extract-cert $(X509_DEP) FORCE
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$(call if_changed,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY))
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endif # CONFIG_MODULE_SIG
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ifeq ($(CONFIG_SYSTEM_REVOCATION_LIST),y)
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$(eval $(call config_filename,SYSTEM_REVOCATION_KEYS))
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$(obj)/revocation_certificates.o: $(obj)/x509_revocation_list
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quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2))
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cmd_extract_certs = scripts/extract-cert $(2) $@
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targets += x509_revocation_list
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$(obj)/x509_revocation_list: scripts/extract-cert $(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(SYSTEM_REVOCATION_KEYS_FILENAME) FORCE
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$(call if_changed,extract_certs,$(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_REVOCATION_KEYS))
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endif
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