On Tue Aug 15, 2023 at 2:27 PM EEST, Nayna Jain wrote:
> Keys that derive their trust from an entity such as a security officer,
> administrator, system owner, or machine owner are said to have "imputed
> trust". CA keys with imputed trust can be loaded onto the machine keyring.
> The mechanism for loading these keys onto the machine keyring is platform
> dependent.
>
> Load keys stored in the variable trustedcadb onto the .machine keyring
> on PowerVM platform.
>
> Signed-off-by: Nayna Jain <nayna@xxxxxxxxxxxxx>
> Reviewed-and-tested-by: Mimi Zohar <zohar@xxxxxxxxxxxxx>
> ---
> .../integrity/platform_certs/keyring_handler.c | 8 ++++++++
> .../integrity/platform_certs/keyring_handler.h | 5 +++++
> .../integrity/platform_certs/load_powerpc.c | 17 +++++++++++++++++
> 3 files changed, 30 insertions(+)
>
> diff --git a/security/integrity/platform_certs/keyring_handler.c b/security/integrity/platform_certs/keyring_handler.c
> index 8a1124e4d769..1649d047e3b8 100644
> --- a/security/integrity/platform_certs/keyring_handler.c
> +++ b/security/integrity/platform_certs/keyring_handler.c
> @@ -69,6 +69,14 @@ __init efi_element_handler_t get_handler_for_mok(const efi_guid_t *sig_type)
> return NULL;
> }
>
> +__init efi_element_handler_t get_handler_for_ca_keys(const efi_guid_t *sig_type)
> +{
> + if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0)
> + return add_to_machine_keyring;
> +
> + return NULL;
> +}
> +
> /*
> * Return the appropriate handler for particular signature list types found in
> * the UEFI dbx and MokListXRT tables.
> diff --git a/security/integrity/platform_certs/keyring_handler.h b/security/integrity/platform_certs/keyring_handler.h
> index 212d894a8c0c..6f15bb4cc8dc 100644
> --- a/security/integrity/platform_certs/keyring_handler.h
> +++ b/security/integrity/platform_certs/keyring_handler.h
> @@ -29,6 +29,11 @@ efi_element_handler_t get_handler_for_db(const efi_guid_t *sig_type);
> */
> efi_element_handler_t get_handler_for_mok(const efi_guid_t *sig_type);
>
> +/*
> + * Return the handler for particular signature list types for CA keys.
> + */
> +efi_element_handler_t get_handler_for_ca_keys(const efi_guid_t *sig_type);
> +
> /*
> * Return the handler for particular signature list types found in the dbx.
> */
> diff --git a/security/integrity/platform_certs/load_powerpc.c b/security/integrity/platform_certs/load_powerpc.c
> index 170789dc63d2..339053d9726d 100644
> --- a/security/integrity/platform_certs/load_powerpc.c
> +++ b/security/integrity/platform_certs/load_powerpc.c
> @@ -59,6 +59,7 @@ static __init void *get_cert_list(u8 *key, unsigned long keylen, u64 *size)
> static int __init load_powerpc_certs(void)
> {
> void *db = NULL, *dbx = NULL, *data = NULL;
> + void *trustedca;
> u64 dsize = 0;
> u64 offset = 0;
> int rc = 0;
> @@ -120,6 +121,22 @@ static int __init load_powerpc_certs(void)
> kfree(data);
> }
>
> + data = get_cert_list("trustedcadb", 12, &dsize);
> + if (!data) {
> + pr_info("Couldn't get trustedcadb list from firmware\n");
> + } else if (IS_ERR(data)) {
> + rc = PTR_ERR(data);
> + pr_err("Error reading trustedcadb from firmware: %d\n", rc);
> + } else {
> + extract_esl(trustedca, data, dsize, offset);
> +
> + rc = parse_efi_signature_list("powerpc:trustedca", trustedca, dsize,
> + get_handler_for_ca_keys);
> + if (rc)
> + pr_err("Couldn't parse trustedcadb signatures: %d\n", rc);
> + kfree(data);
> + }
> +
> return rc;
> }
> late_initcall(load_powerpc_certs);
> --
> 2.31.1
Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
BR, Jarkko
