mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 01:04:19 +08:00
734114f878
Add the following:
(1) A new system keyring that is used to store information about
blacklisted certificates and signatures.
(2) A new key type (called 'blacklist') that is used to store a
blacklisted hash in its description as a hex string. The key accepts
no payload.
(3) The ability to configure a list of blacklisted hashes into the kernel
at build time. This is done by setting
CONFIG_SYSTEM_BLACKLIST_HASH_LIST to the filename of a list of hashes
that are in the form:
"<hash>", "<hash>", ..., "<hash>"
where each <hash> is a hex string representation of the hash and must
include all necessary leading zeros to pad the hash to the right size.
The above are enabled with CONFIG_SYSTEM_BLACKLIST_KEYRING.
Once the kernel is booted, the blacklist keyring can be listed:
root@andromeda ~]# keyctl show %:.blacklist
Keyring
723359729 ---lswrv 0 0 keyring: .blacklist
676257228 ---lswrv 0 0 \_ blacklist: 123412341234c55c1dcc601ab8e172917706aa32fb5eaf826813547fdf02dd46
The blacklist cannot currently be modified by userspace, but it will be
possible to load it, for example, from the UEFI blacklist database.
A later commit will make it possible to load blacklisted asymmetric keys in
here too.
Signed-off-by: David Howells <dhowells@redhat.com>
86 lines
3.4 KiB
Plaintext
86 lines
3.4 KiB
Plaintext
menu "Certificates for signature checking"
|
|
|
|
config MODULE_SIG_KEY
|
|
string "File name or PKCS#11 URI of module signing key"
|
|
default "certs/signing_key.pem"
|
|
depends on MODULE_SIG
|
|
help
|
|
Provide the file name of a private key/certificate in PEM format,
|
|
or a PKCS#11 URI according to RFC7512. The file should contain, or
|
|
the URI should identify, both the certificate and its corresponding
|
|
private key.
|
|
|
|
If this option is unchanged from its default "certs/signing_key.pem",
|
|
then the kernel will automatically generate the private key and
|
|
certificate as described in Documentation/module-signing.txt
|
|
|
|
config SYSTEM_TRUSTED_KEYRING
|
|
bool "Provide system-wide ring of trusted keys"
|
|
depends on KEYS
|
|
depends on ASYMMETRIC_KEY_TYPE
|
|
help
|
|
Provide a system keyring to which trusted keys can be added. Keys in
|
|
the keyring are considered to be trusted. Keys may be added at will
|
|
by the kernel from compiled-in data and from hardware key stores, but
|
|
userspace may only add extra keys if those keys can be verified by
|
|
keys already in the keyring.
|
|
|
|
Keys in this keyring are used by module signature checking.
|
|
|
|
config SYSTEM_TRUSTED_KEYS
|
|
string "Additional X.509 keys for default system keyring"
|
|
depends on SYSTEM_TRUSTED_KEYRING
|
|
help
|
|
If set, this option should be the filename of a PEM-formatted file
|
|
containing trusted X.509 certificates to be included in the default
|
|
system keyring. Any certificate used for module signing is implicitly
|
|
also trusted.
|
|
|
|
NOTE: If you previously provided keys for the system keyring in the
|
|
form of DER-encoded *.x509 files in the top-level build directory,
|
|
those are no longer used. You will need to set this option instead.
|
|
|
|
config SYSTEM_EXTRA_CERTIFICATE
|
|
bool "Reserve area for inserting a certificate without recompiling"
|
|
depends on SYSTEM_TRUSTED_KEYRING
|
|
help
|
|
If set, space for an extra certificate will be reserved in the kernel
|
|
image. This allows introducing a trusted certificate to the default
|
|
system keyring without recompiling the kernel.
|
|
|
|
config SYSTEM_EXTRA_CERTIFICATE_SIZE
|
|
int "Number of bytes to reserve for the extra certificate"
|
|
depends on SYSTEM_EXTRA_CERTIFICATE
|
|
default 4096
|
|
help
|
|
This is the number of bytes reserved in the kernel image for a
|
|
certificate to be inserted.
|
|
|
|
config SECONDARY_TRUSTED_KEYRING
|
|
bool "Provide a keyring to which extra trustable keys may be added"
|
|
depends on SYSTEM_TRUSTED_KEYRING
|
|
help
|
|
If set, provide a keyring to which extra keys may be added, provided
|
|
those keys are not blacklisted and are vouched for by a key built
|
|
into the kernel or already in the secondary trusted keyring.
|
|
|
|
config SYSTEM_BLACKLIST_KEYRING
|
|
bool "Provide system-wide ring of blacklisted keys"
|
|
depends on KEYS
|
|
help
|
|
Provide a system keyring to which blacklisted keys can be added.
|
|
Keys in the keyring are considered entirely untrusted. Keys in this
|
|
keyring are used by the module signature checking to reject loading
|
|
of modules signed with a blacklisted key.
|
|
|
|
config SYSTEM_BLACKLIST_HASH_LIST
|
|
string "Hashes to be preloaded into the system blacklist keyring"
|
|
depends on SYSTEM_BLACKLIST_KEYRING
|
|
help
|
|
If set, this option should be the filename of a list of hashes in the
|
|
form "<hash>", "<hash>", ... . This will be included into a C
|
|
wrapper to incorporate the list into the kernel. Each <hash> should
|
|
be a string of hex digits.
|
|
|
|
endmenu
|