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cfc411e7 DH |
1 | # |
2 | # Makefile for the linux kernel signature checking certificates. | |
3 | # | |
4 | ||
5 | obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o | |
6 | ||
cfc411e7 DH |
7 | ifeq ($(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 $(objtree) | |
15 | AFLAGS_system_certificates.o := -I$(srctree) | |
16 | ||
17 | quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2)) | |
18 | cmd_extract_certs = scripts/extract-cert $(2) $@ || ( rm $@; exit 1) | |
19 | ||
20 | targets += 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)$(CONFIG_SYSTEM_TRUSTED_KEYS)) | |
23 | endif | |
24 | ||
25 | clean-files := x509_certificate_list .x509.list | |
26 | ||
27 | ifeq ($(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 | ############################################################################### | |
35 | ifndef CONFIG_MODULE_SIG_HASH | |
36 | $(error Could not determine digest type to use from kernel config) | |
37 | endif | |
38 | ||
39 | # We do it this way rather than having a boolean option for enabling an | |
40 | # external private key, because 'make randconfig' might enable such a | |
41 | # boolean option and we unfortunately can't make it depend on !RANDCONFIG. | |
42 | ifeq ($(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" | |
79 | endif | |
80 | ||
81 | $(eval $(call config_filename,MODULE_SIG_KEY)) | |
82 | ||
83 | # If CONFIG_MODULE_SIG_KEY isn't a PKCS#11 URI, depend on it | |
84 | ifeq ($(patsubst pkcs11:%,%,$(firstword $(MODULE_SIG_KEY_FILENAME))),$(firstword $(MODULE_SIG_KEY_FILENAME))) | |
85 | X509_DEP := $(MODULE_SIG_KEY_SRCPREFIX)$(MODULE_SIG_KEY_FILENAME) | |
86 | endif | |
87 | ||
88 | # GCC PR#66871 again. | |
89 | $(obj)/system_certificates.o: $(obj)/signing_key.x509 | |
90 | ||
62172c81 DW |
91 | targets += 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 | 94 | endif |