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Move certificate handling to its own directory
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>
This commit is contained in:
David Howells
David Woodhouse
parent
0e38c35815
commit
cfc411e7ff
@ -92,13 +92,13 @@ This has a number of options available:
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(4) "File name or PKCS#11 URI of module signing key" (CONFIG_MODULE_SIG_KEY)
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Setting this option to something other than its default of
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"signing_key.pem" will disable the autogeneration of signing keys and
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allow the kernel modules to be signed with a key of your choosing.
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The string provided should identify a file containing both a private
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key and its corresponding X.509 certificate in PEM form, or — on
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systems where the OpenSSL ENGINE_pkcs11 is functional — a PKCS#11 URI
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as defined by RFC7512. In the latter case, the PKCS#11 URI should
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reference both a certificate and a private key.
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"certs/signing_key.pem" will disable the autogeneration of signing keys
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and allow the kernel modules to be signed with a key of your choosing.
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The string provided should identify a file containing both a private key
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and its corresponding X.509 certificate in PEM form, or — on systems where
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the OpenSSL ENGINE_pkcs11 is functional — a PKCS#11 URI as defined by
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RFC7512. In the latter case, the PKCS#11 URI should reference both a
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certificate and a private key.
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If the PEM file containing the private key is encrypted, or if the
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PKCS#11 token requries a PIN, this can be provided at build time by
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@ -130,12 +130,12 @@ Under normal conditions, when CONFIG_MODULE_SIG_KEY is unchanged from its
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default, the kernel build will automatically generate a new keypair using
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openssl if one does not exist in the file:
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signing_key.pem
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certs/signing_key.pem
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during the building of vmlinux (the public part of the key needs to be built
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into vmlinux) using parameters in the:
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x509.genkey
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certs/x509.genkey
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file (which is also generated if it does not already exist).
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@ -2589,6 +2589,15 @@ S: Supported
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F: Documentation/filesystems/ceph.txt
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F: fs/ceph/
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CERTIFICATE HANDLING:
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M: David Howells <dhowells@redhat.com>
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M: David Woodhouse <dwmw2@infradead.org>
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L: keyrings@linux-nfs.org
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S: Maintained
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F: Documentation/module-signing.txt
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F: certs/
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F: scripts/extract-cert.c
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CERTIFIED WIRELESS USB (WUSB) SUBSYSTEM:
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L: linux-usb@vger.kernel.org
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S: Orphan
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4
Makefile
4
Makefile
@ -871,7 +871,7 @@ INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
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ifdef CONFIG_MODULE_SIG_ALL
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MODSECKEY = $(CONFIG_MODULE_SIG_KEY)
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MODPUBKEY = ./signing_key.x509
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MODPUBKEY = certs/signing_key.x509
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export MODPUBKEY
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mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
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else
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@ -881,7 +881,7 @@ export mod_sign_cmd
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ifeq ($(KBUILD_EXTMOD),)
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core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
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core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
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vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
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$(core-y) $(core-m) $(drivers-y) $(drivers-m) \
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42
certs/Kconfig
Normal file
42
certs/Kconfig
Normal file
@ -0,0 +1,42 @@
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menu "Certificates for signature checking"
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config MODULE_SIG_KEY
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string "File name or PKCS#11 URI of module signing key"
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default "certs/signing_key.pem"
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depends on MODULE_SIG
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help
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Provide the file name of a private key/certificate in PEM format,
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or a PKCS#11 URI according to RFC7512. The file should contain, or
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the URI should identify, both the certificate and its corresponding
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private key.
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If this option is unchanged from its default "certs/signing_key.pem",
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then the kernel will automatically generate the private key and
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certificate as described in Documentation/module-signing.txt
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config SYSTEM_TRUSTED_KEYRING
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bool "Provide system-wide ring of trusted keys"
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depends on KEYS
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help
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Provide a system keyring to which trusted keys can be added. Keys in
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the keyring are considered to be trusted. Keys may be added at will
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by the kernel from compiled-in data and from hardware key stores, but
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userspace may only add extra keys if those keys can be verified by
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keys already in the keyring.
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Keys in this keyring are used by module signature checking.
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config SYSTEM_TRUSTED_KEYS
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string "Additional X.509 keys for default system keyring"
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depends on SYSTEM_TRUSTED_KEYRING
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help
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If set, this option should be the filename of a PEM-formatted file
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containing trusted X.509 certificates to be included in the default
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system keyring. Any certificate used for module signing is implicitly
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also trusted.
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NOTE: If you previously provided keys for the system keyring in the
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form of DER-encoded *.x509 files in the top-level build directory,
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those are no longer used. You will need to set this option instead.
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endmenu
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147
certs/Makefile
Normal file
147
certs/Makefile
Normal file
@ -0,0 +1,147 @@
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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
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###############################################################################
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#
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# When a Kconfig string contains a filename, it is suitable for
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# passing to shell commands. It is surrounded by double-quotes, and
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# any double-quotes or backslashes within it are escaped by
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# backslashes.
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#
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# This is no use for dependencies or $(wildcard). We need to strip the
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# surrounding quotes and the escaping from quotes and backslashes, and
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# we *do* need to escape any spaces in the string. So, for example:
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#
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# Usage: $(eval $(call config_filename,FOO))
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#
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# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
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# transformed as described above to be suitable for use within the
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# makefile.
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#
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# Also, if the filename is a relative filename and exists in the source
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# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
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# be prefixed to *both* command invocation and dependencies.
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#
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# Note: We also print the filenames in the quiet_cmd_foo text, and
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# perhaps ought to have a version specially escaped for that purpose.
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# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
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# enough. It'll strip the quotes in the common case where there's no
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# space and it's a simple filename, and it'll retain the quotes when
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# there's a space. There are some esoteric cases in which it'll print
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# the wrong thing, but we don't really care. The actual dependencies
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# and commands *do* get it right, with various combinations of single
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# and double quotes, backslashes and spaces in the filenames.
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#
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###############################################################################
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#
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quote := $(firstword " ")
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space :=
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space +=
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space_escape := %%%SPACE%%%
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#
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define config_filename
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ifneq ($$(CONFIG_$(1)),"")
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$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
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ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
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else
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ifeq ($$(wildcard $$($(1)_FILENAME)),)
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ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
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$(1)_SRCPREFIX := $(srctree)/
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endif
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endif
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endif
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endif
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endef
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#
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###############################################################################
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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) $@ || ( rm $@; exit 1)
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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
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clean-files := x509_certificate_list .x509.list
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ifeq ($(CONFIG_MODULE_SIG),y)
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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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# 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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$(obj)/signing_key.pem: $(obj)/x509.genkey
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@echo "###"
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@echo "### Now generating an X.509 key pair to be used for signing modules."
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@echo "###"
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@echo "### If this takes a long time, you might wish to run rngd in the"
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@echo "### background to keep the supply of entropy topped up. It"
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@echo "### needs to be run as root, and uses a hardware random"
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@echo "### number generator if one is available."
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@echo "###"
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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 2>&1
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@echo "###"
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@echo "### Key pair generated."
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@echo "###"
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$(obj)/x509.genkey:
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@echo 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
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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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$(obj)/signing_key.x509: scripts/extract-cert include/config/module/sig/key.h $(X509_DEP)
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$(call cmd,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY))
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endif
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@ -8,9 +8,9 @@
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VMLINUX_SYMBOL(system_certificate_list):
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__cert_list_start:
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#ifdef CONFIG_MODULE_SIG
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.incbin "signing_key.x509"
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.incbin "certs/signing_key.x509"
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#endif
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.incbin "kernel/x509_certificate_list"
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.incbin "certs/x509_certificate_list"
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__cert_list_end:
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.align 8
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@ -1601,5 +1601,6 @@ config CRYPTO_HASH_INFO
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source "drivers/crypto/Kconfig"
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source crypto/asymmetric_keys/Kconfig
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source certs/Kconfig
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endif # if CRYPTO
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39
init/Kconfig
39
init/Kconfig
@ -1740,31 +1740,6 @@ config MMAP_ALLOW_UNINITIALIZED
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See Documentation/nommu-mmap.txt for more information.
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config SYSTEM_TRUSTED_KEYRING
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bool "Provide system-wide ring of trusted keys"
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depends on KEYS
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help
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Provide a system keyring to which trusted keys can be added. Keys in
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the keyring are considered to be trusted. Keys may be added at will
|
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by the kernel from compiled-in data and from hardware key stores, but
|
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userspace may only add extra keys if those keys can be verified by
|
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keys already in the keyring.
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Keys in this keyring are used by module signature checking.
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config SYSTEM_TRUSTED_KEYS
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string "Additional X.509 keys for default system keyring"
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depends on SYSTEM_TRUSTED_KEYRING
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help
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If set, this option should be the filename of a PEM-formatted file
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containing trusted X.509 certificates to be included in the default
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system keyring. Any certificate used for module signing is implicitly
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also trusted.
|
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|
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NOTE: If you previously provided keys for the system keyring in the
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form of DER-encoded *.x509 files in the top-level build directory,
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those are no longer used. You will need to set this option instead.
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config SYSTEM_DATA_VERIFICATION
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def_bool n
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select SYSTEM_TRUSTED_KEYRING
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@ -1965,20 +1940,6 @@ config MODULE_SIG_HASH
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default "sha384" if MODULE_SIG_SHA384
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default "sha512" if MODULE_SIG_SHA512
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config MODULE_SIG_KEY
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string "File name or PKCS#11 URI of module signing key"
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default "signing_key.pem"
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depends on MODULE_SIG
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help
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Provide the file name of a private key/certificate in PEM format,
|
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or a PKCS#11 URI according to RFC7512. The file should contain, or
|
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the URI should identify, both the certificate and its corresponding
|
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private key.
|
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|
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If this option is unchanged from its default "signing_key.pem",
|
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then the kernel will automatically generate the private key and
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certificate as described in Documentation/module-signing.txt
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config MODULE_COMPRESS
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bool "Compress modules on installation"
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depends on MODULES
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143
kernel/Makefile
143
kernel/Makefile
@ -45,7 +45,6 @@ ifneq ($(CONFIG_SMP),y)
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obj-y += up.o
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endif
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obj-$(CONFIG_UID16) += uid16.o
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obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o
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obj-$(CONFIG_MODULES) += module.o
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obj-$(CONFIG_MODULE_SIG) += module_signing.o
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obj-$(CONFIG_KALLSYMS) += kallsyms.o
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@ -111,145 +110,3 @@ $(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE
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targets += config_data.h
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$(obj)/config_data.h: $(obj)/config_data.gz FORCE
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$(call filechk,ikconfiggz)
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###############################################################################
|
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#
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# When a Kconfig string contains a filename, it is suitable for
|
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# passing to shell commands. It is surrounded by double-quotes, and
|
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# any double-quotes or backslashes within it are escaped by
|
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# backslashes.
|
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#
|
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# This is no use for dependencies or $(wildcard). We need to strip the
|
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# surrounding quotes and the escaping from quotes and backslashes, and
|
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# we *do* need to escape any spaces in the string. So, for example:
|
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#
|
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# Usage: $(eval $(call config_filename,FOO))
|
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#
|
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# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
|
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# transformed as described above to be suitable for use within the
|
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# makefile.
|
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#
|
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# Also, if the filename is a relative filename and exists in the source
|
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# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
|
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# be prefixed to *both* command invocation and dependencies.
|
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#
|
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# Note: We also print the filenames in the quiet_cmd_foo text, and
|
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# perhaps ought to have a version specially escaped for that purpose.
|
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# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
|
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# enough. It'll strip the quotes in the common case where there's no
|
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# 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
|
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# the wrong thing, but we don't really care. The actual dependencies
|
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# and commands *do* get it right, with various combinations of single
|
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# and double quotes, backslashes and spaces in the filenames.
|
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#
|
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###############################################################################
|
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#
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quote := $(firstword " ")
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space :=
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space +=
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space_escape := %%%SPACE%%%
|
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#
|
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define config_filename
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ifneq ($$(CONFIG_$(1)),"")
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$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
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ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
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else
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ifeq ($$(wildcard $$($(1)_FILENAME)),)
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ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
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$(1)_SRCPREFIX := $(srctree)/
|
||||
endif
|
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endif
|
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endif
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endif
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endef
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#
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###############################################################################
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ifeq ($(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)
|
||||
$(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),"signing_key.pem")
|
||||
signing_key.pem: 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 x509.genkey \
|
||||
-outform PEM -out signing_key.pem \
|
||||
-keyout signing_key.pem 2>&1
|
||||
@echo "###"
|
||||
@echo "### Key pair generated."
|
||||
@echo "###"
|
||||
|
||||
x509.genkey:
|
||||
@echo Generating X.509 key generation config
|
||||
@echo >x509.genkey "[ req ]"
|
||||
@echo >>x509.genkey "default_bits = 4096"
|
||||
@echo >>x509.genkey "distinguished_name = req_distinguished_name"
|
||||
@echo >>x509.genkey "prompt = no"
|
||||
@echo >>x509.genkey "string_mask = utf8only"
|
||||
@echo >>x509.genkey "x509_extensions = myexts"
|
||||
@echo >>x509.genkey
|
||||
@echo >>x509.genkey "[ req_distinguished_name ]"
|
||||
@echo >>x509.genkey "#O = Unspecified company"
|
||||
@echo >>x509.genkey "CN = Build time autogenerated kernel key"
|
||||
@echo >>x509.genkey "#emailAddress = unspecified.user@unspecified.company"
|
||||
@echo >>x509.genkey
|
||||
@echo >>x509.genkey "[ myexts ]"
|
||||
@echo >>x509.genkey "basicConstraints=critical,CA:FALSE"
|
||||
@echo >>x509.genkey "keyUsage=digitalSignature"
|
||||
@echo >>x509.genkey "subjectKeyIdentifier=hash"
|
||||
@echo >>x509.genkey "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: signing_key.x509
|
||||
|
||||
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
|
||||
|
||||
Loading…
Reference in New Issue
Block a user