1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 menu "Certificates for signature checking" 2 menu "Certificates for signature checking"
3 3
4 config MODULE_SIG_KEY 4 config MODULE_SIG_KEY
5 string "File name or PKCS#11 URI of mo 5 string "File name or PKCS#11 URI of module signing key"
6 default "certs/signing_key.pem" 6 default "certs/signing_key.pem"
7 depends on MODULE_SIG || (IMA_APPRAISE !! 7 depends on MODULE_SIG
8 help 8 help
9 Provide the file name of a private ke 9 Provide the file name of a private key/certificate in PEM format,
10 or a PKCS#11 URI according to RFC7512 10 or a PKCS#11 URI according to RFC7512. The file should contain, or
11 the URI should identify, both the cer 11 the URI should identify, both the certificate and its corresponding
12 private key. 12 private key.
13 13
14 If this option is unchanged from its 14 If this option is unchanged from its default "certs/signing_key.pem",
15 then the kernel will automatically ge 15 then the kernel will automatically generate the private key and
16 certificate as described in Documenta 16 certificate as described in Documentation/admin-guide/module-signing.rst
17 17
18 choice <<
19 prompt "Type of module signing key to <<
20 depends on MODULE_SIG || (IMA_APPRAISE <<
21 help <<
22 The type of module signing key type t <<
23 does not apply if a #PKCS11 URI is us <<
24 <<
25 config MODULE_SIG_KEY_TYPE_RSA <<
26 bool "RSA" <<
27 help <<
28 Use an RSA key for module signing. <<
29 <<
30 config MODULE_SIG_KEY_TYPE_ECDSA <<
31 bool "ECDSA" <<
32 select CRYPTO_ECDSA <<
33 depends on !(MODULE_SIG_SHA256 || MODU <<
34 help <<
35 Use an elliptic curve key (NIST P384) <<
36 a strong hash of same or higher bit l <<
37 sha512 for hashing modules. <<
38 <<
39 Note: Remove all ECDSA signing keys, <<
40 when falling back to building Linux 5 <<
41 <<
42 endchoice <<
43 <<
44 config SYSTEM_TRUSTED_KEYRING 18 config SYSTEM_TRUSTED_KEYRING
45 bool "Provide system-wide ring of trus 19 bool "Provide system-wide ring of trusted keys"
46 depends on KEYS 20 depends on KEYS
47 depends on ASYMMETRIC_KEY_TYPE 21 depends on ASYMMETRIC_KEY_TYPE
48 depends on X509_CERTIFICATE_PARSER = y <<
49 help 22 help
50 Provide a system keyring to which tr 23 Provide a system keyring to which trusted keys can be added. Keys in
51 the keyring are considered to be tru 24 the keyring are considered to be trusted. Keys may be added at will
52 by the kernel from compiled-in data 25 by the kernel from compiled-in data and from hardware key stores, but
53 userspace may only add extra keys if 26 userspace may only add extra keys if those keys can be verified by
54 keys already in the keyring. 27 keys already in the keyring.
55 28
56 Keys in this keyring are used by mod 29 Keys in this keyring are used by module signature checking.
57 30
58 config SYSTEM_TRUSTED_KEYS 31 config SYSTEM_TRUSTED_KEYS
59 string "Additional X.509 keys for defa 32 string "Additional X.509 keys for default system keyring"
60 depends on SYSTEM_TRUSTED_KEYRING 33 depends on SYSTEM_TRUSTED_KEYRING
61 help 34 help
62 If set, this option should be the fi 35 If set, this option should be the filename of a PEM-formatted file
63 containing trusted X.509 certificate 36 containing trusted X.509 certificates to be included in the default
64 system keyring. Any certificate used 37 system keyring. Any certificate used for module signing is implicitly
65 also trusted. 38 also trusted.
66 39
67 NOTE: If you previously provided key 40 NOTE: If you previously provided keys for the system keyring in the
68 form of DER-encoded *.x509 files in 41 form of DER-encoded *.x509 files in the top-level build directory,
69 those are no longer used. You will n 42 those are no longer used. You will need to set this option instead.
70 43
71 config SYSTEM_EXTRA_CERTIFICATE 44 config SYSTEM_EXTRA_CERTIFICATE
72 bool "Reserve area for inserting a cer 45 bool "Reserve area for inserting a certificate without recompiling"
73 depends on SYSTEM_TRUSTED_KEYRING 46 depends on SYSTEM_TRUSTED_KEYRING
74 help 47 help
75 If set, space for an extra certifica 48 If set, space for an extra certificate will be reserved in the kernel
76 image. This allows introducing a tru 49 image. This allows introducing a trusted certificate to the default
77 system keyring without recompiling t 50 system keyring without recompiling the kernel.
78 51
79 config SYSTEM_EXTRA_CERTIFICATE_SIZE 52 config SYSTEM_EXTRA_CERTIFICATE_SIZE
80 int "Number of bytes to reserve for th 53 int "Number of bytes to reserve for the extra certificate"
81 depends on SYSTEM_EXTRA_CERTIFICATE 54 depends on SYSTEM_EXTRA_CERTIFICATE
82 default 4096 55 default 4096
83 help 56 help
84 This is the number of bytes reserved 57 This is the number of bytes reserved in the kernel image for a
85 certificate to be inserted. 58 certificate to be inserted.
86 59
87 config SECONDARY_TRUSTED_KEYRING 60 config SECONDARY_TRUSTED_KEYRING
88 bool "Provide a keyring to which extra 61 bool "Provide a keyring to which extra trustable keys may be added"
89 depends on SYSTEM_TRUSTED_KEYRING 62 depends on SYSTEM_TRUSTED_KEYRING
90 help 63 help
91 If set, provide a keyring to which e 64 If set, provide a keyring to which extra keys may be added, provided
92 those keys are not blacklisted and a 65 those keys are not blacklisted and are vouched for by a key built
93 into the kernel, machine keyring (if !! 66 into the kernel or already in the secondary trusted keyring.
94 secondary trusted keyring. <<
95 <<
96 config SECONDARY_TRUSTED_KEYRING_SIGNED_BY_BUI <<
97 bool "Only allow additional certs sign <<
98 depends on SECONDARY_TRUSTED_KEYRING <<
99 help <<
100 If set, only certificates signed by <<
101 keyring may be loaded onto the secon <<
102 <<
103 Note: The machine keyring, if config <<
104 secondary keyring. When enabling th <<
105 to also configure INTEGRITY_CA_MACHI <<
106 linking code signing keys with imput <<
107 trusted keyring. <<
108 67
109 config SYSTEM_BLACKLIST_KEYRING 68 config SYSTEM_BLACKLIST_KEYRING
110 bool "Provide system-wide ring of blac 69 bool "Provide system-wide ring of blacklisted keys"
111 depends on KEYS 70 depends on KEYS
112 help 71 help
113 Provide a system keyring to which bl 72 Provide a system keyring to which blacklisted keys can be added.
114 Keys in the keyring are considered e 73 Keys in the keyring are considered entirely untrusted. Keys in this
115 keyring are used by the module signa 74 keyring are used by the module signature checking to reject loading
116 of modules signed with a blacklisted 75 of modules signed with a blacklisted key.
117 76
118 config SYSTEM_BLACKLIST_HASH_LIST 77 config SYSTEM_BLACKLIST_HASH_LIST
119 string "Hashes to be preloaded into th 78 string "Hashes to be preloaded into the system blacklist keyring"
120 depends on SYSTEM_BLACKLIST_KEYRING 79 depends on SYSTEM_BLACKLIST_KEYRING
121 help 80 help
122 If set, this option should be the fi 81 If set, this option should be the filename of a list of hashes in the
123 form "<hash>", "<hash>", ... . This 82 form "<hash>", "<hash>", ... . This will be included into a C
124 wrapper to incorporate the list into !! 83 wrapper to incorporate the list into the kernel. Each <hash> should
125 string starting with a prefix ("tbs" !! 84 be a string of hex digits.
126 finally an even number of hexadecima <<
127 Certificate hashes can be generated <<
128 tools/certs/print-cert-tbs-hash.sh . <<
129 <<
130 config SYSTEM_REVOCATION_LIST <<
131 bool "Provide system-wide ring of revo <<
132 depends on SYSTEM_BLACKLIST_KEYRING <<
133 depends on PKCS7_MESSAGE_PARSER=y <<
134 help <<
135 If set, this allows revocation certi <<
136 blacklist keyring and implements a h <<
137 be checked to see if it matches such <<
138 <<
139 config SYSTEM_REVOCATION_KEYS <<
140 string "X.509 certificates to be prelo <<
141 depends on SYSTEM_REVOCATION_LIST <<
142 help <<
143 If set, this option should be the fi <<
144 containing X.509 certificates to be <<
145 keyring. <<
146 <<
147 config SYSTEM_BLACKLIST_AUTH_UPDATE <<
148 bool "Allow root to add signed blackli <<
149 depends on SYSTEM_BLACKLIST_KEYRING <<
150 depends on SYSTEM_DATA_VERIFICATION <<
151 help <<
152 If set, provide the ability to load <<
153 they are signed and vouched by a cer <<
154 keyring. The PKCS#7 signature of th <<
155 payload. Blacklist keys cannot be r <<
156 85
157 endmenu 86 endmenu
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