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Linux/certs/Kconfig

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Diff markup

Differences between /certs/Kconfig (Version linux-6.11.5) and /certs/Kconfig (Version linux-6.8.12)


  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 || (IMA_APPRAISE_MODSIG && MODULES)
  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                                             18 choice
 19         prompt "Type of module signing key to      19         prompt "Type of module signing key to be generated"
 20         depends on MODULE_SIG || (IMA_APPRAISE     20         depends on MODULE_SIG || (IMA_APPRAISE_MODSIG && MODULES)
 21         help                                       21         help
 22          The type of module signing key type t     22          The type of module signing key type to generate. This option
 23          does not apply if a #PKCS11 URI is us     23          does not apply if a #PKCS11 URI is used.
 24                                                    24 
 25 config MODULE_SIG_KEY_TYPE_RSA                     25 config MODULE_SIG_KEY_TYPE_RSA
 26         bool "RSA"                                 26         bool "RSA"
 27         help                                       27         help
 28          Use an RSA key for module signing.        28          Use an RSA key for module signing.
 29                                                    29 
 30 config MODULE_SIG_KEY_TYPE_ECDSA                   30 config MODULE_SIG_KEY_TYPE_ECDSA
 31         bool "ECDSA"                               31         bool "ECDSA"
 32         select CRYPTO_ECDSA                        32         select CRYPTO_ECDSA
 33         depends on !(MODULE_SIG_SHA256 || MODU     33         depends on !(MODULE_SIG_SHA256 || MODULE_SIG_SHA3_256)
 34         help                                       34         help
 35          Use an elliptic curve key (NIST P384)     35          Use an elliptic curve key (NIST P384) for module signing. Use
 36          a strong hash of same or higher bit l     36          a strong hash of same or higher bit length, i.e. sha384 or
 37          sha512 for hashing modules.               37          sha512 for hashing modules.
 38                                                    38 
 39          Note: Remove all ECDSA signing keys,      39          Note: Remove all ECDSA signing keys, e.g. certs/signing_key.pem,
 40          when falling back to building Linux 5     40          when falling back to building Linux 5.14 and older kernels.
 41                                                    41 
 42 endchoice                                          42 endchoice
 43                                                    43 
 44 config SYSTEM_TRUSTED_KEYRING                      44 config SYSTEM_TRUSTED_KEYRING
 45         bool "Provide system-wide ring of trus     45         bool "Provide system-wide ring of trusted keys"
 46         depends on KEYS                            46         depends on KEYS
 47         depends on ASYMMETRIC_KEY_TYPE             47         depends on ASYMMETRIC_KEY_TYPE
 48         depends on X509_CERTIFICATE_PARSER = y     48         depends on X509_CERTIFICATE_PARSER = y
 49         help                                       49         help
 50           Provide a system keyring to which tr     50           Provide a system keyring to which trusted keys can be added.  Keys in
 51           the keyring are considered to be tru     51           the keyring are considered to be trusted.  Keys may be added at will
 52           by the kernel from compiled-in data      52           by the kernel from compiled-in data and from hardware key stores, but
 53           userspace may only add extra keys if     53           userspace may only add extra keys if those keys can be verified by
 54           keys already in the keyring.             54           keys already in the keyring.
 55                                                    55 
 56           Keys in this keyring are used by mod     56           Keys in this keyring are used by module signature checking.
 57                                                    57 
 58 config SYSTEM_TRUSTED_KEYS                         58 config SYSTEM_TRUSTED_KEYS
 59         string "Additional X.509 keys for defa     59         string "Additional X.509 keys for default system keyring"
 60         depends on SYSTEM_TRUSTED_KEYRING          60         depends on SYSTEM_TRUSTED_KEYRING
 61         help                                       61         help
 62           If set, this option should be the fi     62           If set, this option should be the filename of a PEM-formatted file
 63           containing trusted X.509 certificate     63           containing trusted X.509 certificates to be included in the default
 64           system keyring. Any certificate used     64           system keyring. Any certificate used for module signing is implicitly
 65           also trusted.                            65           also trusted.
 66                                                    66 
 67           NOTE: If you previously provided key     67           NOTE: If you previously provided keys for the system keyring in the
 68           form of DER-encoded *.x509 files in      68           form of DER-encoded *.x509 files in the top-level build directory,
 69           those are no longer used. You will n     69           those are no longer used. You will need to set this option instead.
 70                                                    70 
 71 config SYSTEM_EXTRA_CERTIFICATE                    71 config SYSTEM_EXTRA_CERTIFICATE
 72         bool "Reserve area for inserting a cer     72         bool "Reserve area for inserting a certificate without recompiling"
 73         depends on SYSTEM_TRUSTED_KEYRING          73         depends on SYSTEM_TRUSTED_KEYRING
 74         help                                       74         help
 75           If set, space for an extra certifica     75           If set, space for an extra certificate will be reserved in the kernel
 76           image. This allows introducing a tru     76           image. This allows introducing a trusted certificate to the default
 77           system keyring without recompiling t     77           system keyring without recompiling the kernel.
 78                                                    78 
 79 config SYSTEM_EXTRA_CERTIFICATE_SIZE               79 config SYSTEM_EXTRA_CERTIFICATE_SIZE
 80         int "Number of bytes to reserve for th     80         int "Number of bytes to reserve for the extra certificate"
 81         depends on SYSTEM_EXTRA_CERTIFICATE        81         depends on SYSTEM_EXTRA_CERTIFICATE
 82         default 4096                               82         default 4096
 83         help                                       83         help
 84           This is the number of bytes reserved     84           This is the number of bytes reserved in the kernel image for a
 85           certificate to be inserted.              85           certificate to be inserted.
 86                                                    86 
 87 config SECONDARY_TRUSTED_KEYRING                   87 config SECONDARY_TRUSTED_KEYRING
 88         bool "Provide a keyring to which extra     88         bool "Provide a keyring to which extra trustable keys may be added"
 89         depends on SYSTEM_TRUSTED_KEYRING          89         depends on SYSTEM_TRUSTED_KEYRING
 90         help                                       90         help
 91           If set, provide a keyring to which e     91           If set, provide a keyring to which extra keys may be added, provided
 92           those keys are not blacklisted and a     92           those keys are not blacklisted and are vouched for by a key built
 93           into the kernel, machine keyring (if     93           into the kernel, machine keyring (if configured), or already in the
 94           secondary trusted keyring.               94           secondary trusted keyring.
 95                                                    95 
 96 config SECONDARY_TRUSTED_KEYRING_SIGNED_BY_BUI     96 config SECONDARY_TRUSTED_KEYRING_SIGNED_BY_BUILTIN
 97         bool "Only allow additional certs sign     97         bool "Only allow additional certs signed by keys on the builtin trusted keyring"
 98         depends on SECONDARY_TRUSTED_KEYRING       98         depends on SECONDARY_TRUSTED_KEYRING
 99         help                                       99         help
100           If set, only certificates signed by     100           If set, only certificates signed by keys on the builtin trusted
101           keyring may be loaded onto the secon    101           keyring may be loaded onto the secondary trusted keyring.
102                                                   102 
103           Note: The machine keyring, if config    103           Note: The machine keyring, if configured, will be linked to the
104           secondary keyring.  When enabling th    104           secondary keyring.  When enabling this option, it is recommended
105           to also configure INTEGRITY_CA_MACHI    105           to also configure INTEGRITY_CA_MACHINE_KEYRING_MAX to prevent
106           linking code signing keys with imput    106           linking code signing keys with imputed trust to the secondary
107           trusted keyring.                        107           trusted keyring.
108                                                   108 
109 config SYSTEM_BLACKLIST_KEYRING                   109 config SYSTEM_BLACKLIST_KEYRING
110         bool "Provide system-wide ring of blac    110         bool "Provide system-wide ring of blacklisted keys"
111         depends on KEYS                           111         depends on KEYS
112         help                                      112         help
113           Provide a system keyring to which bl    113           Provide a system keyring to which blacklisted keys can be added.
114           Keys in the keyring are considered e    114           Keys in the keyring are considered entirely untrusted.  Keys in this
115           keyring are used by the module signa    115           keyring are used by the module signature checking to reject loading
116           of modules signed with a blacklisted    116           of modules signed with a blacklisted key.
117                                                   117 
118 config SYSTEM_BLACKLIST_HASH_LIST                 118 config SYSTEM_BLACKLIST_HASH_LIST
119         string "Hashes to be preloaded into th    119         string "Hashes to be preloaded into the system blacklist keyring"
120         depends on SYSTEM_BLACKLIST_KEYRING       120         depends on SYSTEM_BLACKLIST_KEYRING
121         help                                      121         help
122           If set, this option should be the fi    122           If set, this option should be the filename of a list of hashes in the
123           form "<hash>", "<hash>", ... .  This    123           form "<hash>", "<hash>", ... .  This will be included into a C
124           wrapper to incorporate the list into    124           wrapper to incorporate the list into the kernel.  Each <hash> must be a
125           string starting with a prefix ("tbs"    125           string starting with a prefix ("tbs" or "bin"), then a colon (":"), and
126           finally an even number of hexadecima    126           finally an even number of hexadecimal lowercase characters (up to 128).
127           Certificate hashes can be generated     127           Certificate hashes can be generated with
128           tools/certs/print-cert-tbs-hash.sh .    128           tools/certs/print-cert-tbs-hash.sh .
129                                                   129 
130 config SYSTEM_REVOCATION_LIST                     130 config SYSTEM_REVOCATION_LIST
131         bool "Provide system-wide ring of revo    131         bool "Provide system-wide ring of revocation certificates"
132         depends on SYSTEM_BLACKLIST_KEYRING       132         depends on SYSTEM_BLACKLIST_KEYRING
133         depends on PKCS7_MESSAGE_PARSER=y         133         depends on PKCS7_MESSAGE_PARSER=y
134         help                                      134         help
135           If set, this allows revocation certi    135           If set, this allows revocation certificates to be stored in the
136           blacklist keyring and implements a h    136           blacklist keyring and implements a hook whereby a PKCS#7 message can
137           be checked to see if it matches such    137           be checked to see if it matches such a certificate.
138                                                   138 
139 config SYSTEM_REVOCATION_KEYS                     139 config SYSTEM_REVOCATION_KEYS
140         string "X.509 certificates to be prelo    140         string "X.509 certificates to be preloaded into the system blacklist keyring"
141         depends on SYSTEM_REVOCATION_LIST         141         depends on SYSTEM_REVOCATION_LIST
142         help                                      142         help
143           If set, this option should be the fi    143           If set, this option should be the filename of a PEM-formatted file
144           containing X.509 certificates to be     144           containing X.509 certificates to be included in the default blacklist
145           keyring.                                145           keyring.
146                                                   146 
147 config SYSTEM_BLACKLIST_AUTH_UPDATE               147 config SYSTEM_BLACKLIST_AUTH_UPDATE
148         bool "Allow root to add signed blackli    148         bool "Allow root to add signed blacklist keys"
149         depends on SYSTEM_BLACKLIST_KEYRING       149         depends on SYSTEM_BLACKLIST_KEYRING
150         depends on SYSTEM_DATA_VERIFICATION       150         depends on SYSTEM_DATA_VERIFICATION
151         help                                      151         help
152           If set, provide the ability to load     152           If set, provide the ability to load new blacklist keys at run time if
153           they are signed and vouched by a cer    153           they are signed and vouched by a certificate from the builtin trusted
154           keyring.  The PKCS#7 signature of th    154           keyring.  The PKCS#7 signature of the description is set in the key
155           payload.  Blacklist keys cannot be r    155           payload.  Blacklist keys cannot be removed.
156                                                   156 
157 endmenu                                           157 endmenu
                                                      

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