Linux 5.16-rc8
[muen/linux.git] / certs / Makefile
1 # SPDX-License-Identifier: GPL-2.0
2 #
3 # Makefile for the linux kernel signature checking certificates.
4 #
5
6 obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o common.o
7 obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o common.o
8 obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revocation_certificates.o
9 ifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST),"")
10 obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_hashes.o
11 else
12 obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_nohashes.o
13 endif
14
15 ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y)
16
17 $(eval $(call config_filename,SYSTEM_TRUSTED_KEYS))
18
19 # GCC doesn't include .incbin files in -MD generated dependencies (PR#66871)
20 $(obj)/system_certificates.o: $(obj)/x509_certificate_list
21
22 # Cope with signing_key.x509 existing in $(srctree) not $(objtree)
23 AFLAGS_system_certificates.o := -I$(srctree)
24
25 quiet_cmd_extract_certs  = EXTRACT_CERTS   $(patsubst "%",%,$(2))
26       cmd_extract_certs  = scripts/extract-cert $(2) $@
27
28 targets += x509_certificate_list
29 $(obj)/x509_certificate_list: scripts/extract-cert $(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(SYSTEM_TRUSTED_KEYS_FILENAME) FORCE
30         $(call if_changed,extract_certs,$(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_TRUSTED_KEYS))
31 endif # CONFIG_SYSTEM_TRUSTED_KEYRING
32
33 clean-files := x509_certificate_list .x509.list x509_revocation_list
34
35 ifeq ($(CONFIG_MODULE_SIG),y)
36         SIGN_KEY = y
37 endif
38
39 ifeq ($(CONFIG_IMA_APPRAISE_MODSIG),y)
40 ifeq ($(CONFIG_MODULES),y)
41         SIGN_KEY = y
42 endif
43 endif
44
45 ifdef SIGN_KEY
46 ###############################################################################
47 #
48 # If module signing is requested, say by allyesconfig, but a key has not been
49 # supplied, then one will need to be generated to make sure the build does not
50 # fail and that the kernel may be used afterwards.
51 #
52 ###############################################################################
53 ifndef CONFIG_MODULE_SIG_HASH
54 $(error Could not determine digest type to use from kernel config)
55 endif
56
57 redirect_openssl        = 2>&1
58 quiet_redirect_openssl  = 2>&1
59 silent_redirect_openssl = 2>/dev/null
60 openssl_available       = $(shell openssl help 2>/dev/null && echo yes)
61
62 # We do it this way rather than having a boolean option for enabling an
63 # external private key, because 'make randconfig' might enable such a
64 # boolean option and we unfortunately can't make it depend on !RANDCONFIG.
65 ifeq ($(CONFIG_MODULE_SIG_KEY),"certs/signing_key.pem")
66
67 ifeq ($(openssl_available),yes)
68 X509TEXT=$(shell openssl x509 -in "certs/signing_key.pem" -text 2>/dev/null)
69 endif
70
71 # Support user changing key type
72 ifdef CONFIG_MODULE_SIG_KEY_TYPE_ECDSA
73 keytype_openssl = -newkey ec -pkeyopt ec_paramgen_curve:secp384r1
74 ifeq ($(openssl_available),yes)
75 $(if $(findstring id-ecPublicKey,$(X509TEXT)),,$(shell rm -f "certs/signing_key.pem"))
76 endif
77 endif # CONFIG_MODULE_SIG_KEY_TYPE_ECDSA
78
79 ifdef CONFIG_MODULE_SIG_KEY_TYPE_RSA
80 ifeq ($(openssl_available),yes)
81 $(if $(findstring rsaEncryption,$(X509TEXT)),,$(shell rm -f "certs/signing_key.pem"))
82 endif
83 endif # CONFIG_MODULE_SIG_KEY_TYPE_RSA
84
85 $(obj)/signing_key.pem: $(obj)/x509.genkey
86         @$(kecho) "###"
87         @$(kecho) "### Now generating an X.509 key pair to be used for signing modules."
88         @$(kecho) "###"
89         @$(kecho) "### If this takes a long time, you might wish to run rngd in the"
90         @$(kecho) "### background to keep the supply of entropy topped up.  It"
91         @$(kecho) "### needs to be run as root, and uses a hardware random"
92         @$(kecho) "### number generator if one is available."
93         @$(kecho) "###"
94         $(Q)openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
95                 -batch -x509 -config $(obj)/x509.genkey \
96                 -outform PEM -out $(obj)/signing_key.pem \
97                 -keyout $(obj)/signing_key.pem \
98                 $(keytype_openssl) \
99                 $($(quiet)redirect_openssl)
100         @$(kecho) "###"
101         @$(kecho) "### Key pair generated."
102         @$(kecho) "###"
103
104 $(obj)/x509.genkey:
105         @$(kecho) Generating X.509 key generation config
106         @echo  >$@ "[ req ]"
107         @echo >>$@ "default_bits = 4096"
108         @echo >>$@ "distinguished_name = req_distinguished_name"
109         @echo >>$@ "prompt = no"
110         @echo >>$@ "string_mask = utf8only"
111         @echo >>$@ "x509_extensions = myexts"
112         @echo >>$@
113         @echo >>$@ "[ req_distinguished_name ]"
114         @echo >>$@ "#O = Unspecified company"
115         @echo >>$@ "CN = Build time autogenerated kernel key"
116         @echo >>$@ "#emailAddress = unspecified.user@unspecified.company"
117         @echo >>$@
118         @echo >>$@ "[ myexts ]"
119         @echo >>$@ "basicConstraints=critical,CA:FALSE"
120         @echo >>$@ "keyUsage=digitalSignature"
121         @echo >>$@ "subjectKeyIdentifier=hash"
122         @echo >>$@ "authorityKeyIdentifier=keyid"
123 endif # CONFIG_MODULE_SIG_KEY
124
125 $(eval $(call config_filename,MODULE_SIG_KEY))
126
127 # If CONFIG_MODULE_SIG_KEY isn't a PKCS#11 URI, depend on it
128 ifeq ($(patsubst pkcs11:%,%,$(firstword $(MODULE_SIG_KEY_FILENAME))),$(firstword $(MODULE_SIG_KEY_FILENAME)))
129 X509_DEP := $(MODULE_SIG_KEY_SRCPREFIX)$(MODULE_SIG_KEY_FILENAME)
130 endif
131
132 # GCC PR#66871 again.
133 $(obj)/system_certificates.o: $(obj)/signing_key.x509
134
135 targets += signing_key.x509
136 $(obj)/signing_key.x509: scripts/extract-cert $(X509_DEP) FORCE
137         $(call if_changed,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY))
138 endif # CONFIG_MODULE_SIG
139
140 ifeq ($(CONFIG_SYSTEM_REVOCATION_LIST),y)
141
142 $(eval $(call config_filename,SYSTEM_REVOCATION_KEYS))
143
144 $(obj)/revocation_certificates.o: $(obj)/x509_revocation_list
145
146 quiet_cmd_extract_certs  = EXTRACT_CERTS   $(patsubst "%",%,$(2))
147       cmd_extract_certs  = scripts/extract-cert $(2) $@
148
149 targets += x509_revocation_list
150 $(obj)/x509_revocation_list: scripts/extract-cert $(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(SYSTEM_REVOCATION_KEYS_FILENAME) FORCE
151         $(call if_changed,extract_certs,$(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_REVOCATION_KEYS))
152 endif