Mickaël Salaün 6364d106e0 certs: Allow root user to append signed hashes to the blacklist keyring ... Add a kernel option SYSTEM_BLACKLIST_AUTH_UPDATE to enable the root user to dynamically add new keys to the blacklist keyring. This enables to invalidate new certificates, either from being loaded in a keyring, or from being trusted in a PKCS#7 certificate chain. This also enables to add new file hashes to be denied by the integrity infrastructure. Being able to untrust a certificate which could have normaly been trusted is a sensitive operation. This is why adding new hashes to the blacklist keyring is only allowed when these hashes are signed and vouched by the builtin trusted keyring. A blacklist hash is stored as a key description. The PKCS#7 signature of this description must be provided as the key payload. Marking a certificate as untrusted should be enforced while the system is running. It is then forbiden to remove such blacklist keys. Update blacklist keyring, blacklist key and revoked certificate access rights: * allows the root user to search for a specific blacklisted hash, which make sense because the descriptions are already viewable; * forbids key update (blacklist and asymmetric ones); * restricts kernel rights on the blacklist keyring to align with the root user rights. See help in tools/certs/print-cert-tbs-hash.sh . Cc: David Howells <dhowells@redhat.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Eric Snowberg <eric.snowberg@oracle.com> Cc: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Mickaël Salaün <mic@linux.microsoft.com> Link: https://lore.kernel.org/r/20210712170313.884724-6-mic@digikod.net Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Tested-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>		2022-05-23 18:47:49 +03:00
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.gitignore	certs: Check that builtin blacklist hashes are valid	2022-05-23 18:47:49 +03:00
blacklist_hashes.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
blacklist_nohashes.c	certs/blacklist_nohashes.c: fix const confusion in certs blacklist	2018-02-21 15:35:43 -08:00
blacklist.c	certs: Allow root user to append signed hashes to the blacklist keyring	2022-05-23 18:47:49 +03:00
blacklist.h	certs: Add EFI_CERT_X509_GUID support for dbx entries	2021-03-11 16:31:28 +00:00
common.c	certs: Move load_system_certificate_list to a common function	2021-03-11 16:32:38 +00:00
common.h	certs: Move load_system_certificate_list to a common function	2021-03-11 16:32:38 +00:00
default_x509.genkey	certs: check-in the default x509 config file	2021-12-11 22:09:14 +09:00
extract-cert.c	certs: move scripts/extract-cert to certs/	2022-01-08 18:28:21 +09:00
Kconfig	certs: Allow root user to append signed hashes to the blacklist keyring	2022-05-23 18:47:49 +03:00
Makefile	certs: Check that builtin blacklist hashes are valid	2022-05-23 18:47:49 +03:00
revocation_certificates.S	certs: Add ability to preload revocation certs	2021-03-11 16:33:49 +00:00
system_certificates.S	certs: include certs/signing_key.x509 unconditionally	2022-03-03 08:16:19 +09:00
system_keyring.c	KEYS: Introduce link restriction for machine keys	2022-03-08 13:55:52 +02:00