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1#
2# Makefile for the linux kernel signature checking certificates.
3#
4
5obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o
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6obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o
7ifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST),"")
8obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_hashes.o
9else
10obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_nohashes.o
11endif
cfc411e7 12
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13ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y)
14
15$(eval $(call config_filename,SYSTEM_TRUSTED_KEYS))
16
17# GCC doesn't include .incbin files in -MD generated dependencies (PR#66871)
18$(obj)/system_certificates.o: $(obj)/x509_certificate_list
19
20# Cope with signing_key.x509 existing in $(srctree) not $(objtree)
21AFLAGS_system_certificates.o := -I$(srctree)
22
23quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2))
24 cmd_extract_certs = scripts/extract-cert $(2) $@ || ( rm $@; exit 1)
25
26targets += x509_certificate_list
27$(obj)/x509_certificate_list: scripts/extract-cert $(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(SYSTEM_TRUSTED_KEYS_FILENAME) FORCE
28 $(call if_changed,extract_certs,$(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_TRUSTED_KEYS))
29endif
30
31clean-files := x509_certificate_list .x509.list
32
33ifeq ($(CONFIG_MODULE_SIG),y)
34###############################################################################
35#
36# If module signing is requested, say by allyesconfig, but a key has not been
37# supplied, then one will need to be generated to make sure the build does not
38# fail and that the kernel may be used afterwards.
39#
40###############################################################################
41ifndef CONFIG_MODULE_SIG_HASH
42$(error Could not determine digest type to use from kernel config)
43endif
44
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45redirect_openssl = 2>&1
46quiet_redirect_openssl = 2>&1
47silent_redirect_openssl = 2>/dev/null
48
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49# We do it this way rather than having a boolean option for enabling an
50# external private key, because 'make randconfig' might enable such a
51# boolean option and we unfortunately can't make it depend on !RANDCONFIG.
52ifeq ($(CONFIG_MODULE_SIG_KEY),"certs/signing_key.pem")
53$(obj)/signing_key.pem: $(obj)/x509.genkey
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54 @$(kecho) "###"
55 @$(kecho) "### Now generating an X.509 key pair to be used for signing modules."
56 @$(kecho) "###"
57 @$(kecho) "### If this takes a long time, you might wish to run rngd in the"
58 @$(kecho) "### background to keep the supply of entropy topped up. It"
59 @$(kecho) "### needs to be run as root, and uses a hardware random"
60 @$(kecho) "### number generator if one is available."
61 @$(kecho) "###"
62 $(Q)openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
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63 -batch -x509 -config $(obj)/x509.genkey \
64 -outform PEM -out $(obj)/signing_key.pem \
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65 -keyout $(obj)/signing_key.pem \
66 $($(quiet)redirect_openssl)
67 @$(kecho) "###"
68 @$(kecho) "### Key pair generated."
69 @$(kecho) "###"
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70
71$(obj)/x509.genkey:
5d06ee20 72 @$(kecho) Generating X.509 key generation config
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73 @echo >$@ "[ req ]"
74 @echo >>$@ "default_bits = 4096"
75 @echo >>$@ "distinguished_name = req_distinguished_name"
76 @echo >>$@ "prompt = no"
77 @echo >>$@ "string_mask = utf8only"
78 @echo >>$@ "x509_extensions = myexts"
79 @echo >>$@
80 @echo >>$@ "[ req_distinguished_name ]"
81 @echo >>$@ "#O = Unspecified company"
82 @echo >>$@ "CN = Build time autogenerated kernel key"
83 @echo >>$@ "#emailAddress = unspecified.user@unspecified.company"
84 @echo >>$@
85 @echo >>$@ "[ myexts ]"
86 @echo >>$@ "basicConstraints=critical,CA:FALSE"
87 @echo >>$@ "keyUsage=digitalSignature"
88 @echo >>$@ "subjectKeyIdentifier=hash"
89 @echo >>$@ "authorityKeyIdentifier=keyid"
90endif
91
92$(eval $(call config_filename,MODULE_SIG_KEY))
93
94# If CONFIG_MODULE_SIG_KEY isn't a PKCS#11 URI, depend on it
95ifeq ($(patsubst pkcs11:%,%,$(firstword $(MODULE_SIG_KEY_FILENAME))),$(firstword $(MODULE_SIG_KEY_FILENAME)))
96X509_DEP := $(MODULE_SIG_KEY_SRCPREFIX)$(MODULE_SIG_KEY_FILENAME)
97endif
98
99# GCC PR#66871 again.
100$(obj)/system_certificates.o: $(obj)/signing_key.x509
101
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102targets += signing_key.x509
103$(obj)/signing_key.x509: scripts/extract-cert $(X509_DEP) FORCE
104 $(call if_changed,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY))
cfc411e7 105endif