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security/intel/cbnt: Add option to generate an unsigned BPM 

Change-Id: Ic1b941f06b44bd3067e5b071af8f7a02499d7827
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51573
Reviewed-by: Christian Walter <christian.walter@9elements.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Arthur Heymans 2021-03-17 12:23:20 +01:00
parent 15412c0681
commit 6362df3f5e
2 changed files with 26 additions and 1 deletions
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15
src/security/intel/cbnt/Kconfig
View File

@ -50,11 +50,24 @@ config INTEL_CBNT_BG_PROV_KM_USE_CFG_FILE
config INTEL_CBNT_GENERATE_BPM
bool "Generate Boot Policy Manifest (BPM)"
default y
select INTEL_CBNT_NEED_BPM_PRIV_KEY
select INTEL_CBNT_NEED_BPM_PRIV_KEY if !INTEL_CBNT_BPM_ONLY_UNSIGNED
help
Select y to generate the Boot Policy Manifest (BPM).
Select n to include a BPM binary.
config INTEL_CBNT_BPM_ONLY_UNSIGNED
bool "Only unsigned boot policy manifest (BPM)"
depends on INTEL_CBNT_GENERATE_BPM
help
Skip signing the BPM.
The resulting unsigned BPM will be placed at build/bpm_unsigned.bin.
The resulting coreboot image will not be functional with CBnT.
After the unsigned BPM is signed externally you can add it to cbfs
and fit:
"$ cbfstool build/coreboot.rom add -f bpm.bin -n boot_policy_manifest.bin -t raw -a 16"
"$ ifittool -r COREBOOT -a -n boot_policy_manifest.bin -t 12 -s 12 -f build/coreboot.rom"
'-s 12' where 12 is CONFIG_CPU_INTEL_NUM_FIT_ENTRIES.
config INTEL_CBNT_BG_PROV_CFG_FILE
string "CBnT json config file"
depends on INTEL_CBNT_BG_PROV_KM_USE_CFG_FILE || INTEL_CBNT_GENERATE_BPM

12
src/security/intel/cbnt/Makefile.inc
View File

@ -38,6 +38,15 @@ $(obj)/bpm_unsigned.bin: $(obj)/coreboot.rom $(BG_PROV) $(CBNT_CFG)
printf " BG_PROV creating unsigned BPM using config file\n"
$(BG_PROV) bpm-gen $@ $< --config=$(CBNT_CFG) --cut
ifeq ($(CONFIG_INTEL_CBNT_BPM_ONLY_UNSIGNED),y)
build_complete:: $(obj)/bpm_unsigned.bin
@printf "\n** WARNING **\n"
@printf "Build generated an unsigned BPM image: build/bpm_unsigned.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 "$$ cbfstool build/coreboot.rom add -f bpm.bin -n boot_policy_manifest.bin -t raw -a 16\n"
@printf "$$ ifittool -r COREBOOT -a -n boot_policy_manifest.bin -t 12 -s 12 -f build/coreboot.rom\n"
else
$(obj)/bpm.bin: $(obj)/bpm_unsigned.bin $(BG_PROV) $(call strip_quotes, $(CONFIG_INTEL_CBNT_BPM_PRIV_KEY_FILE))
printf " BG_PROV signing real BPM\n"
$(BG_PROV) bpm-sign $< $@ $(CONFIG_INTEL_CBNT_BPM_PRIV_KEY_FILE) ""
@ -49,7 +58,10 @@ files_added:: $(obj)/bpm.bin
printf " IFITTOOL Adding BPM\n"
$(IFITTOOL) -r COREBOOT -a -n boot_policy_manifest.bin -t 12 -s $(CONFIG_CPU_INTEL_NUM_FIT_ENTRIES) -f $(obj)/coreboot.rom
endif # CONFIG_INTEL_CBNT_BPM_ONLY_UNSIGNED
else # CONFIG_INTEL_CBNT_GENERATE_BPM
ifneq ($(CONFIG_INTEL_CBNT_BOOT_POLICY_MANIFEST_BINARY),"")
cbfs-files-y += boot_policy_manifest.bin
boot_policy_manifest.bin-file := $(CONFIG_INTEL_CBNT_BOOT_POLICY_MANIFEST_BINARY)