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| author | Arthur Heymans <arthur@aheymans.xyz> | 2021-03-17 12:03:39 +0100 |
|---|---|---|
| committer | Arthur Heymans <arthur@aheymans.xyz> | 2021-03-30 11:45:32 +0000 |
| commit | 5e0119eaf6fce0ddd78dd75413bdeb5e9a774418 (patch) | |
| tree | 5c928a3ac3df1149ce1cb944ded28525651e962d /src | |
| parent | f1d196c4893a2e613b9cd50031324a1552fcdcc8 (diff) | |
security/intel/cbnt: Add an option to generate an unsigned KM
This is useful if you have external infrastructure to sign KM.
Change-Id: If5e9306366230b75d97e4e1fb271bcd7615abd5f
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51572
Reviewed-by: Christian Walter <christian.walter@9elements.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src')
| -rw-r--r-- | src/security/intel/cbnt/Kconfig | 15 | ||||
| -rw-r--r-- | src/security/intel/cbnt/Makefile.inc | 14 |
2 files changed, 28 insertions, 1 deletions
diff --git a/src/security/intel/cbnt/Kconfig b/src/security/intel/cbnt/Kconfig index 0f4c2167c9..6142a2498e 100644 --- a/src/security/intel/cbnt/Kconfig +++ b/src/security/intel/cbnt/Kconfig @@ -20,12 +20,25 @@ config INTEL_CBNT_GENERATE_KM bool "Generate Key Manifest (KM)" default y select INTEL_CBNT_NEED_KM_PUB_KEY - select INTEL_CBNT_NEED_KM_PRIV_KEY + select INTEL_CBNT_NEED_KM_PRIV_KEY if !INTEL_CBNT_KM_ONLY_UNSIGNED select INTEL_CBNT_NEED_BPM_PUB_KEY if !INTEL_CBNT_BG_PROV_KM_USE_CFG_FILE help Select y to generate the Key Manifest (KM). Select n to include a KM binary. +config INTEL_CBNT_KM_ONLY_UNSIGNED + bool "Only unsigned key manifest (KM)" + depends on INTEL_CBNT_GENERATE_KM + help + Skip signing the KM. + The resulting unsigned KM will be placed at build/km_unsigned.bin. + The resulting coreboot image will not be functional with CBnT. + After the unsigned KM is signed externally you can either rebuild + coreboot using that binary or add it to cbfs and fit: + "$ cbfstool build/coreboot.rom add -f km.bin -n key_manifest.bin -t raw -a 16" + "$ ifittool -r COREBOOT -a -n key_manifest.bin -t 11 -s 12 -f build/coreboot.rom" + '-s 12' where 12 is CONFIG_CPU_INTEL_NUM_FIT_ENTRIES. + config INTEL_CBNT_BG_PROV_KM_USE_CFG_FILE bool "KM: use a CBnT json config file" depends on INTEL_CBNT_GENERATE_KM diff --git a/src/security/intel/cbnt/Makefile.inc b/src/security/intel/cbnt/Makefile.inc index 62b12f0c0f..eae3079528 100644 --- a/src/security/intel/cbnt/Makefile.inc +++ b/src/security/intel/cbnt/Makefile.inc @@ -71,6 +71,19 @@ KM_FILE=$(CONFIG_INTEL_CBNT_KEY_MANIFEST_BINARY) endif ifneq ($(KM_FILE),"") +ifeq ($(CONFIG_INTEL_CBNT_KM_ONLY_UNSIGNED),y) +$(call add_intermediate, gen_unsigned_km, $(obj)/km_unsigned.bin) + @printf "Generating unsgined KM\n" + +build_complete:: + @printf "\n** WARNING **\n" + @printf "Build generated an unsigned KM image: build/km_unsiged.bin.\n" + @printf "The resulting image will not work with CBnT.\n" + @printf "After you have externally signed the image you can add it to the coreboot image:\n" + @printf "$$ cbfstool build/coreboot.rom add -f km.bin -n key_manifest.bin -t raw -a 16\n" + @printf "$$ ifittool -r COREBOOT -a -n key_manifest.bin -t 11 -s 12 -f build/coreboot.rom\n" + +else cbfs-files-y += key_manifest.bin key_manifest.bin-file := $(KM_FILE) key_manifest.bin-type := raw @@ -80,4 +93,5 @@ $(call add_intermediate, add_km_fit, $(IFITTOOL) set_fit_ptr) $(IFITTOOL) -r COREBOOT -a -n key_manifest.bin -t 11 -s $(CONFIG_CPU_INTEL_NUM_FIT_ENTRIES) -f $< endif +endif # CONFIG_INTEL_CBNT_KM_ONLY_UNSIGNED endif # CONFIG_INTEL_CBNT_SUPPORT |