lkml.org 
[lkml]   [2021]   [Nov]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v7 16/17] integrity: Trust MOK keys if MokListTrustedRT found
    Date
    A new Machine Owner Key (MOK) variable called MokListTrustedRT has been
    introduced in shim. When this UEFI variable is set, it indicates the
    end-user has made the decision themselves that they wish to trust MOK keys
    within the Linux trust boundary. It is not an error if this variable
    does not exist. If it does not exist, the MOK keys should not be trusted
    within the kernel.

    Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
    ---
    v1: Initial version
    v2: Removed mok_keyring_trust_setup function
    v4: Unmodified from v2
    v5: Rename to machine keyring
    v6: Unmodified from v5
    v7: Use mokvar table instead of EFI var (suggested by Peter Jones)
    ---
    .../platform_certs/machine_keyring.c | 19 +++++++++++++++++++
    1 file changed, 19 insertions(+)

    diff --git a/security/integrity/platform_certs/machine_keyring.c b/security/integrity/platform_certs/machine_keyring.c
    index ea2ac2f9f2b5..09fd8f20c756 100644
    --- a/security/integrity/platform_certs/machine_keyring.c
    +++ b/security/integrity/platform_certs/machine_keyring.c
    @@ -5,6 +5,7 @@
    * Copyright (c) 2021, Oracle and/or its affiliates.
    */

    +#include <linux/efi.h>
    #include "../integrity.h"

    static __init int machine_keyring_init(void)
    @@ -40,3 +41,21 @@ void __init add_to_machine_keyring(const char *source, const void *data, size_t
    if (rc)
    pr_info("Error adding keys to machine keyring %s\n", source);
    }
    +
    +/*
    + * Try to load the MokListTrustedRT MOK variable to see if we should trust
    + * the MOK keys within the kernel. It is not an error if this variable
    + * does not exist. If it does not exist, MOK keys should not be trusted
    + * within the machine keyring.
    + */
    +static __init bool uefi_check_trust_mok_keys(void)
    +{
    + struct efi_mokvar_table_entry *mokvar_entry;
    +
    + mokvar_entry = efi_mokvar_entry_find("MokListTrustedRT");
    +
    + if (mokvar_entry)
    + return true;
    +
    + return false;
    +}
    --
    2.18.4
    \
     
     \ /
      Last update: 2021-11-16 01:22    [W:4.182 / U:0.140 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site