Add support for enabling uefi capsule authentication. This feature is enabled by setting the environment variable "capsule_authentication_enabled".
The following configs are needed for enabling uefi capsule update and capsule authentication features on the platform.
CONFIG_EFI_HAVE_CAPSULE_SUPPORT=y CONFIG_EFI_CAPSULE_ON_DISK=y CONFIG_EFI_CAPSULE_FIRMWARE_MANAGEMENT=y CONFIG_EFI_CAPSULE_FIRMWARE=y CONFIG_EFI_CAPSULE_FIRMWARE_RAW=y CONFIG_EFI_CAPSULE_AUTHENTICATE=y
Signed-off-by: Sughosh Ganu sughosh.ganu@linaro.org ---
Changes since V3: None
lib/efi_loader/efi_firmware.c | 36 ++++++++++++++++++++++++++++++++++- 1 file changed, 35 insertions(+), 1 deletion(-)
diff --git a/lib/efi_loader/efi_firmware.c b/lib/efi_loader/efi_firmware.c index 5d2ecde2f1..5e401bbca2 100644 --- a/lib/efi_loader/efi_firmware.c +++ b/lib/efi_loader/efi_firmware.c @@ -184,9 +184,16 @@ static efi_status_t efi_get_dfu_info( image_info[i].version_name = NULL; /* not supported */ image_info[i].size = 0; image_info[i].attributes_supported = - IMAGE_ATTRIBUTE_IMAGE_UPDATABLE; + IMAGE_ATTRIBUTE_IMAGE_UPDATABLE | + IMAGE_ATTRIBUTE_AUTHENTICATION_REQUIRED; image_info[i].attributes_setting = IMAGE_ATTRIBUTE_IMAGE_UPDATABLE; + + /* Check if the capsule authentication is enabled */ + if (env_get("capsule_authentication_enabled")) + image_info[0].attributes_setting |= + IMAGE_ATTRIBUTE_AUTHENTICATION_REQUIRED; + image_info[i].lowest_supported_image_version = 0; image_info[i].last_attempt_version = 0; image_info[i].last_attempt_status = LAST_ATTEMPT_STATUS_SUCCESS; @@ -403,6 +410,9 @@ efi_status_t EFIAPI efi_firmware_raw_set_image( { u32 fmp_hdr_signature; struct fmp_payload_header *header; + void *capsule_payload; + efi_status_t status; + efi_uintn_t capsule_payload_size;
EFI_ENTRY("%p %d %p %ld %p %p %p\n", this, image_index, image, image_size, vendor_code, progress, abort_reason); @@ -410,6 +420,30 @@ efi_status_t EFIAPI efi_firmware_raw_set_image( if (!image) return EFI_EXIT(EFI_INVALID_PARAMETER);
+ /* Authenticate the capsule if authentication enabled */ + if (IS_ENABLED(CONFIG_EFI_CAPSULE_AUTHENTICATE) && + env_get("capsule_authentication_enabled")) { + capsule_payload = NULL; + capsule_payload_size = 0; + status = efi_capsule_authenticate(image, image_size, + &capsule_payload, + &capsule_payload_size); + + if (status == EFI_SECURITY_VIOLATION) { + printf("Capsule authentication check failed. Aborting update\n"); + return EFI_EXIT(status); + } else if (status != EFI_SUCCESS) { + return EFI_EXIT(status); + } + + debug("Capsule authentication successfull\n"); + image = capsule_payload; + image_size = capsule_payload_size; + } else { + debug("Capsule authentication disabled. "); + debug("Updating capsule without authenticating.\n"); + } + fmp_hdr_signature = FMP_PAYLOAD_HDR_SIGNATURE; header = (void *)image;