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integrity: Load mokx variables into the blacklist keyring

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During boot the Secure Boot Forbidden Signature Database, dbx,
is loaded into the blacklist keyring.  Systems booted with shim
have an equivalent Forbidden Signature Database called mokx.
Currently mokx is only used by shim and grub, the contents are
ignored by the kernel.

Add the ability to load mokx into the blacklist keyring during boot.

Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
Suggested-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
cc: keyrings@vger.kernel.org
Link: https://lore.kernel.org/r/c33c8e3839a41e9654f41cc92c7231104931b1d7.camel@HansenPartnership.com/
Link: https://lore.kernel.org/r/20210122181054.32635-5-eric.snowberg@oracle.com/ # v5
Link: https://lore.kernel.org/r/161428674320.677100.12637282414018170743.stgit@warthog.procyon.org.uk/
Link: https://lore.kernel.org/r/161433313205.902181.2502803393898221637.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/161529607422.163428.13530426573612578854.stgit@warthog.procyon.org.uk/ # v3
This commit is contained in:
Eric Snowberg 2021-01-22 13:10:54 -05:00 • committed by David Howells
parent d1f044103d
commit ebd9c2ae36
1 changed files with 18 additions and 2 deletions
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20
security/integrity/platform_certs/load_uefi.c
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@ -132,8 +132,9 @@ static int __init load_moklist_certs(void)
static int __init load_uefi_certs(void)
{
efi_guid_t secure_var = EFI_IMAGE_SECURITY_DATABASE_GUID;
void *db = NULL, *dbx = NULL;
unsigned long dbsize = 0, dbxsize = 0;
efi_guid_t mok_var = EFI_SHIM_LOCK_GUID;
void *db = NULL, *dbx = NULL, *mokx = NULL;
unsigned long dbsize = 0, dbxsize = 0, mokxsize = 0;
efi_status_t status;
int rc = 0;
@ -175,6 +176,21 @@ static int __init load_uefi_certs(void)
kfree(dbx);
}
mokx = get_cert_list(L"MokListXRT", &mok_var, &mokxsize, &status);
if (!mokx) {
if (status == EFI_NOT_FOUND)
pr_debug("mokx variable wasn't found\n");
else
pr_info("Couldn't get mokx list\n");
} else {
rc = parse_efi_signature_list("UEFI:MokListXRT",
mokx, mokxsize,
get_handler_for_dbx);
if (rc)
pr_err("Couldn't parse mokx signatures %d\n", rc);
kfree(mokx);
}
/* Load the MokListRT certs */
rc = load_moklist_certs();