[OE-core] [PATCH v2 06/11] ovmf_git.bb: enable Secure Boot

[Patrick Ohly]

When enabled via PACCKAGECONFIG = "secureboot" (off by default because
of the extra work and license change), the recipe compiles OVMF twice,
once without Secure Boot, once with. This is the same approach as in
https://src.fedoraproject.org/cgit/rpms/edk2.git/tree/edk2.spec

The results are "ovmf.qcow2" and "ovmf.secboot.qcow2" in the
image deploy directory, so
  runqemu <machine> <image> ovmf.secboot
will boot with Secure Boot enabled.

ovmf.secboot.code.qcow2 is provided for those who want separate code
and variable flash drives. The normal ovmf.vars.qcow2 can be used with
it.

In contrast to Fedora, no attempt is made to strip potentially patent
encumbered algorithms out of the OpenSSL archive. OVMF does not use
the ones considered problematic for Fedora, so this shouldn't be a
problem.

Fixes: luv-yocto/#38

Signed-off-by: Patrick Ohly <patrick.ohly at intel.com>
---
 meta/recipes-core/ovmf/ovmf_git.bb | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/meta/recipes-core/ovmf/ovmf_git.bb b/meta/recipes-core/ovmf/ovmf_git.bb
index 9989025..bdec6aa 100644
--- a/meta/recipes-core/ovmf/ovmf_git.bb
+++ b/meta/recipes-core/ovmf/ovmf_git.bb
@@ -1,8 +1,15 @@
 DESCRIPTION = "OVMF - UEFI firmware for Qemu and KVM"
 HOMEPAGE = "http://sourceforge.net/apps/mediawiki/tianocore/index.php?title=OVMF"
 LICENSE = "BSD"
+LICENSE_class-target = "${@bb.utils.contains('PACKAGECONFIG', 'secureboot', 'BSD & OpenSSL', 'BSD', d)}"
 LIC_FILES_CHKSUM = "file://OvmfPkg/License.txt;md5=343dc88e82ff33d042074f62050c3496"
 
+# Enabling Secure Boot adds a dependency on OpenSSL and implies
+# compiling OVMF twice, so it is disabled by default. Distros
+# may change that default.
+PACKAGECONFIG ??= ""
+PACKAGECONFIG[secureboot] = ",,,"
+
 SRC_URI = "git://github.com/tianocore/edk2.git;branch=master \
 	file://0001-BaseTools-Force-tools-variables-to-host-toolchain.patch \
 	file://0001-OvmfPkg-Enable-BGRT-in-OVMF.patch \
@@ -10,7 +17,13 @@ SRC_URI = "git://github.com/tianocore/edk2.git;branch=master \
 	file://0003-BaseTools-makefile-adjust-to-build-in-under-bitbake.patch \
         "
 
+SRC_URI_append_class-target = " \
+	${@bb.utils.contains('PACKAGECONFIG', 'secureboot', 'http://www.openssl.org/source/openssl-1.0.2j.tar.gz;name=openssl;subdir=${S}/CryptoPkg/Library/OpensslLib', '', d)} \
+"
+
 SRCREV="4575a602ca6072ee9d04150b38bfb143cbff8588"
+SRC_URI[openssl.md5sum] = "96322138f0b69e61b7212bc53d5e912b"
+SRC_URI[openssl.sha256sum] = "e7aff292be21c259c6af26469c7a9b3ba26e9abaaffd325e3dccc9785256c431"
 
 inherit deploy
 
@@ -32,6 +45,11 @@ BUILD_OPTIMIZATION="-pipe"
 # OVMF supports IA only, although it could conceivably support ARM someday.
 COMPATIBLE_HOST='(i.86|x86_64).*'
 
+# Additional build flags for OVMF with Secure Boot.
+# Fedora also uses "-D SMM_REQUIRE -D EXCLUDE_SHELL_FROM_FD".
+OVMF_SECURE_BOOT_EXTRA_FLAGS ??= ""
+OVMF_SECURE_BOOT_FLAGS = "-DSECURE_BOOT_ENABLE=TRUE ${OVMF_SECURE_BOOT_EXTRA_FLAGS}"
+
 do_patch_append_class-native() {
     bb.build.exec_func('do_fix_iasl', d)
     bb.build.exec_func('do_fix_toolchain', d)
@@ -112,10 +130,27 @@ do_compile_class-target() {
     bbnote FIXED_GCCVER is ${FIXED_GCCVER}
     build_dir="${S}/Build/Ovmf$OVMF_DIR_SUFFIX/RELEASE_${FIXED_GCCVER}"
 
+    bbnote "Building without Secure Boot."
+    rm -rf ${S}/Build/Ovmf$OVMF_DIR_SUFFIX
     ${S}/OvmfPkg/build.sh $PARALLEL_JOBS -a $OVMF_ARCH -b RELEASE -t ${FIXED_GCCVER}
     ln ${build_dir}/FV/OVMF.fd ${WORKDIR}/ovmf/ovmf.fd
     ln ${build_dir}/FV/OVMF_CODE.fd ${WORKDIR}/ovmf/ovmf.code.fd
     ln ${build_dir}/FV/OVMF_VARS.fd ${WORKDIR}/ovmf/ovmf.vars.fd
+
+    if ${@bb.utils.contains('PACKAGECONFIG', 'secureboot', 'true', 'false', d)}; then
+        # See CryptoPkg/Library/OpensslLib/Patch-HOWTO.txt and
+        # https://src.fedoraproject.org/cgit/rpms/edk2.git/tree/ for
+        # building with Secure Boot enabled.
+        bbnote "Building with Secure Boot."
+        rm -rf ${S}/Build/Ovmf$OVMF_DIR_SUFFIX
+        if ! [ -f ${S}/CryptoPkg/Library/OpensslLib/openssl-*/edk2-patch-applied ]; then
+            ( cd ${S}/CryptoPkg/Library/OpensslLib/openssl-* && patch -p1 <$(echo ../EDKII_openssl-*.patch) && touch edk2-patch-applied )
+        fi
+        ( cd ${S}/CryptoPkg/Library/OpensslLib/ && ./Install.sh )
+        ${S}/OvmfPkg/build.sh $PARALLEL_JOBS -a $OVMF_ARCH -b RELEASE -t ${FIXED_GCCVER} ${OVMF_SECURE_BOOT_FLAGS}
+        ln ${build_dir}/FV/OVMF.fd ${WORKDIR}/ovmf/ovmf.secboot.fd
+        ln ${build_dir}/FV/OVMF_CODE.fd ${WORKDIR}/ovmf/ovmf.secboot.code.fd
+    fi
 }
 
 do_install_class-native() {
@@ -135,6 +170,7 @@ do_deploy_class-target() {
         ovmf \
         ovmf.code \
         ovmf.vars \
+        ${@bb.utils.contains('PACKAGECONFIG', 'secureboot', 'ovmf.secboot ovmf.secboot.code', '', d)} \
         ; do
         qemu-img convert -f raw -O qcow2 ${WORKDIR}/ovmf/$i.fd ${DEPLOYDIR}/$i.qcow2
     done
-- 
2.1.4