2 # Makefile for the linux kernel signature checking certificates.
5 obj-
$(CONFIG_SYSTEM_TRUSTED_KEYRING
) += system_keyring.o system_certificates.o
6 obj-
$(CONFIG_SYSTEM_BLACKLIST_KEYRING
) += blacklist.o
7 ifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST
),"")
8 obj-
$(CONFIG_SYSTEM_BLACKLIST_KEYRING
) += blacklist_hashes.o
10 obj-
$(CONFIG_SYSTEM_BLACKLIST_KEYRING
) += blacklist_nohashes.o
12 obj-
$(CONFIG_EFI_SIGNATURE_LIST_PARSER
) += efi_parser.o
14 obj-
$(CONFIG_LOAD_UEFI_KEYS
) += load_uefi.o
15 $(obj
)/load_uefi.o
: KBUILD_CFLAGS
+= -fshort-wchar
18 ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING
),y
)
20 $(eval
$(call config_filename
,SYSTEM_TRUSTED_KEYS
))
22 # GCC doesn't include .incbin files in -MD generated dependencies (PR#66871)
23 $(obj
)/system_certificates.o
: $(obj
)/x509_certificate_list
25 # Cope with signing_key.x509 existing in $(srctree) not $(objtree)
26 AFLAGS_system_certificates.o
:= -I
$(srctree
)
28 quiet_cmd_extract_certs
= EXTRACT_CERTS
$(patsubst "%",%,$(2))
29 cmd_extract_certs
= scripts
/extract-cert
$(2) $@ ||
( rm $@
; exit
1)
31 targets
+= x509_certificate_list
32 $(obj
)/x509_certificate_list
: scripts
/extract-cert
$(SYSTEM_TRUSTED_KEYS_SRCPREFIX
)$(SYSTEM_TRUSTED_KEYS_FILENAME
) FORCE
33 $(call if_changed
,extract_certs
,$(SYSTEM_TRUSTED_KEYS_SRCPREFIX
)$(CONFIG_SYSTEM_TRUSTED_KEYS
))
34 endif # CONFIG_SYSTEM_TRUSTED_KEYRING
36 clean-files
:= x509_certificate_list .x509.list
38 ifeq ($(CONFIG_MODULE_SIG
),y
)
39 ###############################################################################
41 # If module signing is requested, say by allyesconfig, but a key has not been
42 # supplied, then one will need to be generated to make sure the build does not
43 # fail and that the kernel may be used afterwards.
45 ###############################################################################
46 ifndef CONFIG_MODULE_SIG_HASH
47 $(error Could not determine digest type to use from kernel config
)
50 redirect_openssl
= 2>&1
51 quiet_redirect_openssl
= 2>&1
52 silent_redirect_openssl
= 2>/dev
/null
54 # We do it this way rather than having a boolean option for enabling an
55 # external private key, because 'make randconfig' might enable such a
56 # boolean option and we unfortunately can't make it depend on !RANDCONFIG.
57 ifeq ($(CONFIG_MODULE_SIG_KEY
),"certs/signing_key.pem")
58 $(obj
)/signing_key.pem
: $(obj
)/x509.genkey
60 @
$(kecho
) "### Now generating an X.509 key pair to be used for signing modules."
62 @
$(kecho
) "### If this takes a long time, you might wish to run rngd in the"
63 @
$(kecho
) "### background to keep the supply of entropy topped up. It"
64 @
$(kecho
) "### needs to be run as root, and uses a hardware random"
65 @
$(kecho
) "### number generator if one is available."
67 $(Q
)openssl req
-new
-nodes
-utf8
-$(CONFIG_MODULE_SIG_HASH
) -days
36500 \
68 -batch
-x509
-config
$(obj
)/x509.genkey \
69 -outform PEM
-out
$(obj
)/signing_key.pem \
70 -keyout
$(obj
)/signing_key.pem \
71 $($(quiet
)redirect_openssl
)
73 @
$(kecho
) "### Key pair generated."
77 @
$(kecho
) Generating X
.509 key generation config
79 @echo
>>$@
"default_bits = 4096"
80 @echo
>>$@
"distinguished_name = req_distinguished_name"
81 @echo
>>$@
"prompt = no"
82 @echo
>>$@
"string_mask = utf8only"
83 @echo
>>$@
"x509_extensions = myexts"
85 @echo
>>$@
"[ req_distinguished_name ]"
86 @echo
>>$@
"#O = Unspecified company"
87 @echo
>>$@
"CN = Build time autogenerated kernel key"
88 @echo
>>$@
"#emailAddress = unspecified.user@unspecified.company"
90 @echo
>>$@
"[ myexts ]"
91 @echo
>>$@
"basicConstraints=critical,CA:FALSE"
92 @echo
>>$@
"keyUsage=digitalSignature"
93 @echo
>>$@
"subjectKeyIdentifier=hash"
94 @echo
>>$@
"authorityKeyIdentifier=keyid"
95 endif # CONFIG_MODULE_SIG_KEY
97 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
99 # If CONFIG_MODULE_SIG_KEY isn't a PKCS#11 URI, depend on it
100 ifeq ($(patsubst pkcs11
:%,%,$(firstword $(MODULE_SIG_KEY_FILENAME
))),$(firstword $(MODULE_SIG_KEY_FILENAME
)))
101 X509_DEP
:= $(MODULE_SIG_KEY_SRCPREFIX
)$(MODULE_SIG_KEY_FILENAME
)
104 # GCC PR#66871 again.
105 $(obj
)/system_certificates.o
: $(obj
)/signing_key.x509
107 targets
+= signing_key.x509
108 $(obj
)/signing_key.x509
: scripts
/extract-cert
$(X509_DEP
) FORCE
109 $(call if_changed
,extract_certs
,$(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
))
110 endif # CONFIG_MODULE_SIG