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cfc411e7
DH
1#
2# Makefile for the linux kernel signature checking certificates.
3#
4
5obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o
6
cfc411e7
DH
7ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y)
8
9$(eval $(call config_filename,SYSTEM_TRUSTED_KEYS))
10
11# GCC doesn't include .incbin files in -MD generated dependencies (PR#66871)
12$(obj)/system_certificates.o: $(obj)/x509_certificate_list
13
14# Cope with signing_key.x509 existing in $(srctree) not $(objtree)
15AFLAGS_system_certificates.o := -I$(srctree)
16
17quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2))
18 cmd_extract_certs = scripts/extract-cert $(2) $@ || ( rm $@; exit 1)
19
20targets += x509_certificate_list
21$(obj)/x509_certificate_list: scripts/extract-cert $(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(SYSTEM_TRUSTED_KEYS_FILENAME) FORCE
22 $(call if_changed,extract_certs,$(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_TRUSTED_KEYS))
23endif
24
25clean-files := x509_certificate_list .x509.list
26
27ifeq ($(CONFIG_MODULE_SIG),y)
28###############################################################################
29#
30# If module signing is requested, say by allyesconfig, but a key has not been
31# supplied, then one will need to be generated to make sure the build does not
32# fail and that the kernel may be used afterwards.
33#
34###############################################################################
35ifndef CONFIG_MODULE_SIG_HASH
36$(error Could not determine digest type to use from kernel config)
37endif
38
39# We do it this way rather than having a boolean option for enabling an
40# external private key, because 'make randconfig' might enable such a
41# boolean option and we unfortunately can't make it depend on !RANDCONFIG.
42ifeq ($(CONFIG_MODULE_SIG_KEY),"certs/signing_key.pem")
43$(obj)/signing_key.pem: $(obj)/x509.genkey
44 @echo "###"
45 @echo "### Now generating an X.509 key pair to be used for signing modules."
46 @echo "###"
47 @echo "### If this takes a long time, you might wish to run rngd in the"
48 @echo "### background to keep the supply of entropy topped up. It"
49 @echo "### needs to be run as root, and uses a hardware random"
50 @echo "### number generator if one is available."
51 @echo "###"
52 openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
53 -batch -x509 -config $(obj)/x509.genkey \
54 -outform PEM -out $(obj)/signing_key.pem \
55 -keyout $(obj)/signing_key.pem 2>&1
56 @echo "###"
57 @echo "### Key pair generated."
58 @echo "###"
59
60$(obj)/x509.genkey:
61 @echo Generating X.509 key generation config
62 @echo >$@ "[ req ]"
63 @echo >>$@ "default_bits = 4096"
64 @echo >>$@ "distinguished_name = req_distinguished_name"
65 @echo >>$@ "prompt = no"
66 @echo >>$@ "string_mask = utf8only"
67 @echo >>$@ "x509_extensions = myexts"
68 @echo >>$@
69 @echo >>$@ "[ req_distinguished_name ]"
70 @echo >>$@ "#O = Unspecified company"
71 @echo >>$@ "CN = Build time autogenerated kernel key"
72 @echo >>$@ "#emailAddress = unspecified.user@unspecified.company"
73 @echo >>$@
74 @echo >>$@ "[ myexts ]"
75 @echo >>$@ "basicConstraints=critical,CA:FALSE"
76 @echo >>$@ "keyUsage=digitalSignature"
77 @echo >>$@ "subjectKeyIdentifier=hash"
78 @echo >>$@ "authorityKeyIdentifier=keyid"
79endif
80
81$(eval $(call config_filename,MODULE_SIG_KEY))
82
83# If CONFIG_MODULE_SIG_KEY isn't a PKCS#11 URI, depend on it
84ifeq ($(patsubst pkcs11:%,%,$(firstword $(MODULE_SIG_KEY_FILENAME))),$(firstword $(MODULE_SIG_KEY_FILENAME)))
85X509_DEP := $(MODULE_SIG_KEY_SRCPREFIX)$(MODULE_SIG_KEY_FILENAME)
86endif
87
88# GCC PR#66871 again.
89$(obj)/system_certificates.o: $(obj)/signing_key.x509
90
62172c81
DW
91targets += signing_key.x509
92$(obj)/signing_key.x509: scripts/extract-cert $(X509_DEP) FORCE
93 $(call if_changed,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY))
cfc411e7 94endif