Host tool features, such as mkimage's ability to sign FIT images were enabled or disabled based on the target configuration. However, this misses the point of a target-agnostic host tool.
A target's ability to verify FIT signatures is independent of mkimage's ability to create those signatures. In fact, u-boot's build system doesn't sign images. The target code can be successfully built without relying on any ability to sign such code.
Conversely, mkimage's ability to sign images does not require that those images will only work on targets which support FIT verification. Linking mkimage cryptographic features to target support for FIT verification is misguided.
Without loss of generality, we can say that host features are and should be independent of target features.
While we prefer that a host tool always supports the same feature set, we recognize the following - some users prefer to build u-boot without a dependency on OpenSSL. - some distros prefer to ship mkimage without linking to OpenSSL
To allow these use cases, introduce a host-only Kconfig which is used to select or deselect libcrypto support. Some mkimage features or some host tools might not be available, but this shouldn't affect the u-boot build.
I also considered setting the default of this config based on FIT_SIGNATURE. While it would preserve the old behaviour it's also contrary to the goals of this change. I decided to enable it by default, so that the default build yields the most feature-complete mkimage.
Signed-off-by: Alexandru Gagniuc mr.nuke.me@gmail.com --- Changes since v1: * Drop the verb "_USE_" from the Kconfig option name
tools/Kconfig | 11 +++++++++++ tools/Makefile | 46 ++++++++++++++++++++++++++++++---------------- 2 files changed, 41 insertions(+), 16 deletions(-)
diff --git a/tools/Kconfig b/tools/Kconfig index b2f5012240..d6f82cd949 100644 --- a/tools/Kconfig +++ b/tools/Kconfig @@ -9,4 +9,15 @@ config MKIMAGE_DTC_PATH some cases the system dtc may not support all required features and the path to a different version should be given here.
+config TOOLS_LIBCRYPTO + bool "Use OpenSSL's libcrypto library for host tools" + default y + help + Cryptographic signature, verification, and encryption of images is + provided by host tools using OpenSSL's libcrypto. Select 'n' here if + you wish to build host tools without OpenSSL. mkimage will not have + the ability to sign images. + This selection does not affect target features, such as runtime FIT + signature verification. + endmenu diff --git a/tools/Makefile b/tools/Makefile index 722355e984..e250e6f4b6 100644 --- a/tools/Makefile +++ b/tools/Makefile @@ -3,6 +3,25 @@ # (C) Copyright 2000-2006 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+# A note on target vs host configuration: +# +# Host tools can be used across multiple targets, or different configurations +# of the same target. Thus, host tools must be able to handle any combination +# of target configurations. To prevent having different variations of the same +# tool, the tool build options may not depend on target configuration. +# +# Some linux distributions package these utilities as u-boot-tools, and it +# would be unmaintainable to have a different tool variation for each +# arch or configuration. +# +# A couple of simple rules: +# +# 1) Do not use target CONFIG_* options to enable or disable features in host +# tools. Only use the configs from tools/Kconfig +# 2) It's okay to use target configs to disable building specific tools. +# That's as long as the features of those tools aren't modified. +# + # Enable all the config-independent tools ifneq ($(HOST_TOOLS_ALL),) CONFIG_ARCH_KIRKWOOD = y @@ -53,30 +72,30 @@ hostprogs-y += mkenvimage mkenvimage-objs := mkenvimage.o os_support.o lib/crc32.o
hostprogs-y += dumpimage mkimage -hostprogs-$(CONFIG_FIT_SIGNATURE) += fit_info fit_check_sign +hostprogs-$(CONFIG_TOOLS_LIBCRYPTO) += fit_info fit_check_sign
hostprogs-$(CONFIG_CMD_BOOTEFI_SELFTEST) += file2include
FIT_OBJS-$(CONFIG_FIT) := fit_common.o fit_image.o image-host.o common/image-fit.o -FIT_SIG_OBJS-$(CONFIG_FIT_SIGNATURE) := image-sig-host.o common/image-fit-sig.o -FIT_CIPHER_OBJS-$(CONFIG_FIT_CIPHER) := common/image-cipher.o +FIT_SIG_OBJS-$(CONFIG_TOOLS_LIBCRYPTO) := image-sig-host.o common/image-fit-sig.o +FIT_CIPHER_OBJS-$(CONFIG_TOOLS_LIBCRYPTO) := common/image-cipher.o
# The following files are synced with upstream DTC. # Use synced versions from scripts/dtc/libfdt/. LIBFDT_OBJS := $(addprefix libfdt/, fdt.o fdt_ro.o fdt_wip.o fdt_sw.o fdt_rw.o \ fdt_strerror.o fdt_empty_tree.o fdt_addresses.o fdt_overlay.o)
-RSA_OBJS-$(CONFIG_FIT_SIGNATURE) := $(addprefix lib/rsa/, \ +RSA_OBJS-$(CONFIG_TOOLS_LIBCRYPTO) := $(addprefix lib/rsa/, \ rsa-sign.o rsa-verify.o \ rsa-mod-exp.o)
-ECDSA_OBJS-$(CONFIG_FIT_SIGNATURE) := $(addprefix lib/ecdsa/, ecdsa-libcrypto.o) +ECDSA_OBJS-$(CONFIG_TOOLS_LIBCRYPTO) := $(addprefix lib/ecdsa/, ecdsa-libcrypto.o)
-AES_OBJS-$(CONFIG_FIT_CIPHER) := $(addprefix lib/aes/, \ +AES_OBJS-$(CONFIG_TOOLS_LIBCRYPTO) := $(addprefix lib/aes/, \ aes-encrypt.o aes-decrypt.o)
# Cryptographic helpers that depend on openssl/libcrypto -LIBCRYPTO_OBJS-$(CONFIG_FIT_SIGNATURE) := $(addprefix lib/, \ +LIBCRYPTO_OBJS-$(CONFIG_TOOLS_LIBCRYPTO) := $(addprefix lib/, \ fdt-libcrypto.o)
ROCKCHIP_OBS = lib/rc4.o rkcommon.o rkimage.o rksd.o rkspi.o @@ -136,22 +155,17 @@ fit_info-objs := $(dumpimage-mkimage-objs) fit_info.o fit_check_sign-objs := $(dumpimage-mkimage-objs) fit_check_sign.o file2include-objs := file2include.o
-ifneq ($(CONFIG_MX23)$(CONFIG_MX28)$(CONFIG_FIT_SIGNATURE),) +ifneq ($(CONFIG_MX23)$(CONFIG_MX28)$(CONFIG_TOOLS_LIBCRYPTO),) # Add CONFIG_MXS into host CFLAGS, so we can check whether or not register # the mxsimage support within tools/mxsimage.c . HOSTCFLAGS_mxsimage.o += -DCONFIG_MXS endif
-ifdef CONFIG_FIT_SIGNATURE +ifdef CONFIG_TOOLS_LIBCRYPTO # This affects include/image.h, but including the board config file # is tricky, so manually define this options here. HOST_EXTRACFLAGS += -DCONFIG_FIT_SIGNATURE -HOST_EXTRACFLAGS += -DCONFIG_FIT_SIGNATURE_MAX_SIZE=$(CONFIG_FIT_SIGNATURE_MAX_SIZE) -endif - -ifdef CONFIG_FIT_CIPHER -# This affects include/image.h, but including the board config file -# is tricky, so manually define this options here. +HOST_EXTRACFLAGS += -DCONFIG_FIT_SIGNATURE_MAX_SIZE=0xffffffff HOST_EXTRACFLAGS += -DCONFIG_FIT_CIPHER endif
@@ -164,7 +178,7 @@ HOSTCFLAGS_kwbimage.o += -DCONFIG_KWB_SECURE endif
# MXSImage needs LibSSL -ifneq ($(CONFIG_MX23)$(CONFIG_MX28)$(CONFIG_ARMADA_38X)$(CONFIG_FIT_SIGNATURE)$(CONFIG_FIT_CIPHER),) +ifneq ($(CONFIG_MX23)$(CONFIG_MX28)$(CONFIG_ARMADA_38X)$(CONFIG_TOOLS_LIBCRYPTO),) HOSTCFLAGS_kwbimage.o += \ $(shell pkg-config --cflags libssl libcrypto 2> /dev/null || echo "") HOSTLDLIBS_mkimage += \