forked from Minki/linux
cfc411e7ff
Move certificate handling out of the kernel/ directory and into a certs/ directory to get all the weird stuff in one place and move the generated signing keys into this directory. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: David Woodhouse <David.Woodhouse@intel.com>
148 lines
5.8 KiB
Makefile
148 lines
5.8 KiB
Makefile
#
|
|
# Makefile for the linux kernel signature checking certificates.
|
|
#
|
|
|
|
obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o
|
|
|
|
###############################################################################
|
|
#
|
|
# When a Kconfig string contains a filename, it is suitable for
|
|
# passing to shell commands. It is surrounded by double-quotes, and
|
|
# any double-quotes or backslashes within it are escaped by
|
|
# backslashes.
|
|
#
|
|
# This is no use for dependencies or $(wildcard). We need to strip the
|
|
# surrounding quotes and the escaping from quotes and backslashes, and
|
|
# we *do* need to escape any spaces in the string. So, for example:
|
|
#
|
|
# Usage: $(eval $(call config_filename,FOO))
|
|
#
|
|
# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
|
|
# transformed as described above to be suitable for use within the
|
|
# makefile.
|
|
#
|
|
# Also, if the filename is a relative filename and exists in the source
|
|
# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
|
|
# be prefixed to *both* command invocation and dependencies.
|
|
#
|
|
# Note: We also print the filenames in the quiet_cmd_foo text, and
|
|
# perhaps ought to have a version specially escaped for that purpose.
|
|
# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
|
|
# enough. It'll strip the quotes in the common case where there's no
|
|
# space and it's a simple filename, and it'll retain the quotes when
|
|
# there's a space. There are some esoteric cases in which it'll print
|
|
# the wrong thing, but we don't really care. The actual dependencies
|
|
# and commands *do* get it right, with various combinations of single
|
|
# and double quotes, backslashes and spaces in the filenames.
|
|
#
|
|
###############################################################################
|
|
#
|
|
quote := $(firstword " ")
|
|
space :=
|
|
space +=
|
|
space_escape := %%%SPACE%%%
|
|
#
|
|
define config_filename
|
|
ifneq ($$(CONFIG_$(1)),"")
|
|
$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
|
|
ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
|
|
else
|
|
ifeq ($$(wildcard $$($(1)_FILENAME)),)
|
|
ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
|
|
$(1)_SRCPREFIX := $(srctree)/
|
|
endif
|
|
endif
|
|
endif
|
|
endif
|
|
endef
|
|
#
|
|
###############################################################################
|
|
|
|
ifeq ($(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) $@ || ( rm $@; exit 1)
|
|
|
|
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)$(CONFIG_SYSTEM_TRUSTED_KEYS))
|
|
endif
|
|
|
|
clean-files := x509_certificate_list .x509.list
|
|
|
|
ifeq ($(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
|
|
$(error Could not determine digest type to use from kernel config)
|
|
endif
|
|
|
|
# We do it this way rather than having a boolean option for enabling an
|
|
# external private key, because 'make randconfig' might enable such a
|
|
# boolean option and we unfortunately can't make it depend on !RANDCONFIG.
|
|
ifeq ($(CONFIG_MODULE_SIG_KEY),"certs/signing_key.pem")
|
|
$(obj)/signing_key.pem: $(obj)/x509.genkey
|
|
@echo "###"
|
|
@echo "### Now generating an X.509 key pair to be used for signing modules."
|
|
@echo "###"
|
|
@echo "### If this takes a long time, you might wish to run rngd in the"
|
|
@echo "### background to keep the supply of entropy topped up. It"
|
|
@echo "### needs to be run as root, and uses a hardware random"
|
|
@echo "### number generator if one is available."
|
|
@echo "###"
|
|
openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
|
|
-batch -x509 -config $(obj)/x509.genkey \
|
|
-outform PEM -out $(obj)/signing_key.pem \
|
|
-keyout $(obj)/signing_key.pem 2>&1
|
|
@echo "###"
|
|
@echo "### Key pair generated."
|
|
@echo "###"
|
|
|
|
$(obj)/x509.genkey:
|
|
@echo Generating X.509 key generation config
|
|
@echo >$@ "[ 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
|
|
|
|
$(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
|
|
|
|
$(obj)/signing_key.x509: scripts/extract-cert include/config/module/sig/key.h $(X509_DEP)
|
|
$(call cmd,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY))
|
|
endif
|