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ea35e0d5df
Address a kbuild issue where a developer created an ECDSA key for signing
kernel modules and then builds an older version of the kernel, when bi-
secting the kernel for example, that does not support ECDSA keys.
If openssl is installed, trigger the creation of an RSA module signing
key if it is not an RSA key.
Fixes: cfc411e7ff ("Move certificate handling to its own directory")
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>
140 lines
5.1 KiB
Makefile
140 lines
5.1 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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$(if $(findstring rsaEncryption,$(X509TEXT)),,$(shell rm -f "certs/signing_key.pem"))
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endif
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$(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 $(obj)/signing_key.pem \
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$($(quiet)redirect_openssl)
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@$(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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