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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-5.16.20)


  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         default MODULE_SIG_KEY_TYPE_RSA
 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         depends on MODULE_SIG || (IMA_APPRAISE_MODSIG && MODULES)
 27         help                                       28         help
 28          Use an RSA key for module signing.        29          Use an RSA key for module signing.
 29                                                    30 
 30 config MODULE_SIG_KEY_TYPE_ECDSA                   31 config MODULE_SIG_KEY_TYPE_ECDSA
 31         bool "ECDSA"                               32         bool "ECDSA"
 32         select CRYPTO_ECDSA                        33         select CRYPTO_ECDSA
 33         depends on !(MODULE_SIG_SHA256 || MODU !!  34         depends on MODULE_SIG || (IMA_APPRAISE_MODSIG && MODULES)
 34         help                                       35         help
 35          Use an elliptic curve key (NIST P384) !!  36          Use an elliptic curve key (NIST P384) for module signing. Consider
 36          a strong hash of same or higher bit l !!  37          using a strong hash like sha256 or sha384 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 << 
 49         help                                       48         help
 50           Provide a system keyring to which tr     49           Provide a system keyring to which trusted keys can be added.  Keys in
 51           the keyring are considered to be tru     50           the keyring are considered to be trusted.  Keys may be added at will
 52           by the kernel from compiled-in data      51           by the kernel from compiled-in data and from hardware key stores, but
 53           userspace may only add extra keys if     52           userspace may only add extra keys if those keys can be verified by
 54           keys already in the keyring.             53           keys already in the keyring.
 55                                                    54 
 56           Keys in this keyring are used by mod     55           Keys in this keyring are used by module signature checking.
 57                                                    56 
 58 config SYSTEM_TRUSTED_KEYS                         57 config SYSTEM_TRUSTED_KEYS
 59         string "Additional X.509 keys for defa     58         string "Additional X.509 keys for default system keyring"
 60         depends on SYSTEM_TRUSTED_KEYRING          59         depends on SYSTEM_TRUSTED_KEYRING
 61         help                                       60         help
 62           If set, this option should be the fi     61           If set, this option should be the filename of a PEM-formatted file
 63           containing trusted X.509 certificate     62           containing trusted X.509 certificates to be included in the default
 64           system keyring. Any certificate used     63           system keyring. Any certificate used for module signing is implicitly
 65           also trusted.                            64           also trusted.
 66                                                    65 
 67           NOTE: If you previously provided key     66           NOTE: If you previously provided keys for the system keyring in the
 68           form of DER-encoded *.x509 files in      67           form of DER-encoded *.x509 files in the top-level build directory,
 69           those are no longer used. You will n     68           those are no longer used. You will need to set this option instead.
 70                                                    69 
 71 config SYSTEM_EXTRA_CERTIFICATE                    70 config SYSTEM_EXTRA_CERTIFICATE
 72         bool "Reserve area for inserting a cer     71         bool "Reserve area for inserting a certificate without recompiling"
 73         depends on SYSTEM_TRUSTED_KEYRING          72         depends on SYSTEM_TRUSTED_KEYRING
 74         help                                       73         help
 75           If set, space for an extra certifica     74           If set, space for an extra certificate will be reserved in the kernel
 76           image. This allows introducing a tru     75           image. This allows introducing a trusted certificate to the default
 77           system keyring without recompiling t     76           system keyring without recompiling the kernel.
 78                                                    77 
 79 config SYSTEM_EXTRA_CERTIFICATE_SIZE               78 config SYSTEM_EXTRA_CERTIFICATE_SIZE
 80         int "Number of bytes to reserve for th     79         int "Number of bytes to reserve for the extra certificate"
 81         depends on SYSTEM_EXTRA_CERTIFICATE        80         depends on SYSTEM_EXTRA_CERTIFICATE
 82         default 4096                               81         default 4096
 83         help                                       82         help
 84           This is the number of bytes reserved     83           This is the number of bytes reserved in the kernel image for a
 85           certificate to be inserted.              84           certificate to be inserted.
 86                                                    85 
 87 config SECONDARY_TRUSTED_KEYRING                   86 config SECONDARY_TRUSTED_KEYRING
 88         bool "Provide a keyring to which extra     87         bool "Provide a keyring to which extra trustable keys may be added"
 89         depends on SYSTEM_TRUSTED_KEYRING          88         depends on SYSTEM_TRUSTED_KEYRING
 90         help                                       89         help
 91           If set, provide a keyring to which e     90           If set, provide a keyring to which extra keys may be added, provided
 92           those keys are not blacklisted and a     91           those keys are not blacklisted and are vouched for by a key built
 93           into the kernel, machine keyring (if !!  92           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                                                    93 
109 config SYSTEM_BLACKLIST_KEYRING                    94 config SYSTEM_BLACKLIST_KEYRING
110         bool "Provide system-wide ring of blac     95         bool "Provide system-wide ring of blacklisted keys"
111         depends on KEYS                            96         depends on KEYS
112         help                                       97         help
113           Provide a system keyring to which bl     98           Provide a system keyring to which blacklisted keys can be added.
114           Keys in the keyring are considered e     99           Keys in the keyring are considered entirely untrusted.  Keys in this
115           keyring are used by the module signa    100           keyring are used by the module signature checking to reject loading
116           of modules signed with a blacklisted    101           of modules signed with a blacklisted key.
117                                                   102 
118 config SYSTEM_BLACKLIST_HASH_LIST                 103 config SYSTEM_BLACKLIST_HASH_LIST
119         string "Hashes to be preloaded into th    104         string "Hashes to be preloaded into the system blacklist keyring"
120         depends on SYSTEM_BLACKLIST_KEYRING       105         depends on SYSTEM_BLACKLIST_KEYRING
121         help                                      106         help
122           If set, this option should be the fi    107           If set, this option should be the filename of a list of hashes in the
123           form "<hash>", "<hash>", ... .  This    108           form "<hash>", "<hash>", ... .  This will be included into a C
124           wrapper to incorporate the list into !! 109           wrapper to incorporate the list into the kernel.  Each <hash> should
125           string starting with a prefix ("tbs" !! 110           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                                                   111 
130 config SYSTEM_REVOCATION_LIST                     112 config SYSTEM_REVOCATION_LIST
131         bool "Provide system-wide ring of revo    113         bool "Provide system-wide ring of revocation certificates"
132         depends on SYSTEM_BLACKLIST_KEYRING       114         depends on SYSTEM_BLACKLIST_KEYRING
133         depends on PKCS7_MESSAGE_PARSER=y         115         depends on PKCS7_MESSAGE_PARSER=y
134         help                                      116         help
135           If set, this allows revocation certi    117           If set, this allows revocation certificates to be stored in the
136           blacklist keyring and implements a h    118           blacklist keyring and implements a hook whereby a PKCS#7 message can
137           be checked to see if it matches such    119           be checked to see if it matches such a certificate.
138                                                   120 
139 config SYSTEM_REVOCATION_KEYS                     121 config SYSTEM_REVOCATION_KEYS
140         string "X.509 certificates to be prelo    122         string "X.509 certificates to be preloaded into the system blacklist keyring"
141         depends on SYSTEM_REVOCATION_LIST         123         depends on SYSTEM_REVOCATION_LIST
142         help                                      124         help
143           If set, this option should be the fi    125           If set, this option should be the filename of a PEM-formatted file
144           containing X.509 certificates to be     126           containing X.509 certificates to be included in the default blacklist
145           keyring.                                127           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                                                   128 
157 endmenu                                           129 endmenu
                                                      

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