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Allow specification of vendor_cert through a build command line option.

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This allows you to specify the vendor_cert as a file on the command line
during build.
This commit is contained in:
Peter Jones 2012-08-13 17:06:46 -04:00
parent 2295594a47
commit 178b5681b8
4 changed files with 46 additions and 9 deletions
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16
Makefile
View File

@ -14,24 +14,30 @@ EFI_LIBS = -lefi -lgnuefi --start-group Cryptlib/libcryptlib.a Cryptlib/OpenSSL/
EFI_CRT_OBJS = $(EFI_PATH)/crt0-efi-$(ARCH).o
EFI_LDS = $(EFI_PATH)/elf_$(ARCH)_efi.lds
CFLAGS = -ggdb -O0 -fno-stack-protector -fno-strict-aliasing -fpic -fshort-wchar \
-Wall -mno-red-zone \
$(EFI_INCLUDES)
ifeq ($(ARCH),x86_64)
CFLAGS += -DEFI_FUNCTION_WRAPPER
endif
ifneq ($(origin VENDOR_CERT_FILE), undefined)
CFLAGS += -DVENDOR_CERT_FILE=\"$(VENDOR_CERT_FILE)\"
endif
LDFLAGS = -nostdlib -znocombreloc -T $(EFI_LDS) -shared -Bsymbolic -L$(EFI_PATH) -L$(LIB_PATH) -LCryptlib -LCryptlib/OpenSSL $(EFI_CRT_OBJS)
TARGET = shim.efi
OBJS = shim.o shim.so
SOURCES = shim.c shim.h signature.h PeImage.h cert.h
TARGET = shim.efi
OBJS = shim.o cert.o
SOURCES = shim.c shim.h signature.h PeImage.h
all: $(TARGET)
shim.o: $(SOURCES)
shim.so: $(OBJS) Cryptlib/libcryptlib.a Cryptlib/OpenSSL/libopenssl.a
cert.o : cert.S
$(CC) $(CFLAGS) -c -o $@ $<
shim.so: $(OBJS) Cryptlib/libcryptlib.a Cryptlib/OpenSSL/libopenssl.a cert.o
$(LD) -o $@ $(LDFLAGS) $^ $(EFI_LIBS)
Cryptlib/libcryptlib.a:

32
cert.S Normal file
View File

@ -0,0 +1,32 @@
#if defined(VENDOR_CERT_FILE)
.globl vendor_cert
.data
.align 16
.type vendor_cert, @object
.size vendor_cert_size, vendor_cert_size-vendor_cert
vendor_cert:
.incbin VENDOR_CERT_FILE
.globl vendor_cert_size
.data
.align 16
.type vendor_cert_size, @object
.size vendor_cert_size, 4
vendor_cert_size:
.long vendor_cert_size - vendor_cert
#else
.globl vendor_cert
.bss
.type vendor_cert, @object
.size vendor_cert, 1
vendor_cert:
.zero 1
.globl vendor_cert_size
.data
.align 4
.type vendor_cert_size, @object
.size vendor_cert_size, 4
vendor_cert_size:
.long 1
#endif

1
cert.h
View File

@ -1 +0,0 @@
static UINT8 vendor_cert[] = {0x00};

6
shim.c
View File

@ -48,8 +48,8 @@ static EFI_STATUS (EFIAPI *entry_point) (EFI_HANDLE image_handle, EFI_SYSTEM_TAB
/*
* The vendor certificate used for validating the second stage loader
*/
#include "cert.h"
extern UINT8 vendor_cert[];
extern UINT32 vendor_cert_size;
#define EFI_IMAGE_SECURITY_DATABASE_GUID { 0xd719b2cb, 0x3d3a, 0x4596, { 0xa3, 0xbc, 0xda, 0xd0, 0x0e, 0x67, 0x65, 0x6f }}
@ -535,7 +535,7 @@ static EFI_STATUS verify_buffer (char *data, int datasize,
if (!AuthenticodeVerify(cert->CertData,
context->SecDir->Size - sizeof(cert->Hdr),
vendor_cert, sizeof(vendor_cert), hash,
vendor_cert, vendor_cert_size, hash,
SHA256_DIGEST_SIZE)) {
Print(L"Invalid signature\n");
status = EFI_ACCESS_DENIED;