Add support for secure upgrade (sonic-net#11862)

- What I did
Added support for secure upgrade.

- How I did it
During sonic_installer install, added secure upgrade image verification.
HLD can be found in the following PR: sonic-net/SONiC#1024

- Why I did it
Feature is used to allow image was not modified since built from vendor. During installation, image can be verified with a signature attached to it.

- How I did it
Feature includes image signing during build (in sonic buildimage repo) and verification during image install (in sonic-utilities).

- How to verify it
In order for image verification - image must be signed - need to provide signing key and certificate (paths in SECURE_UPGRADE_DEV_SIGNING_KEY and SECURE_UPGRADE_DEV_SIGNING_CERT in rules/config) during build , and during image install, need to enable secure boot flag in bios, and signing_certificate should be available in bios.

- Feature dependencies
In order for this feature to work smoothly, need to have secure boot feature implemented as well.
The Secure boot feature will be merged in the near future.

build_image.sh

@@ -86,7 +86,7 @@ generate_onie_installer_image()
     ## Note: Don't leave blank between lines. It is single line command.
     ./onie-mk-demo.sh $CONFIGURED_ARCH $TARGET_MACHINE $TARGET_PLATFORM-$TARGET_MACHINE-$ONIEIMAGE_VERSION \
           installer platform/$TARGET_MACHINE/platform.conf $output_file OS $IMAGE_VERSION $ONIE_IMAGE_PART_SIZE \
-          $ONIE_INSTALLER_PAYLOAD
+          $ONIE_INSTALLER_PAYLOAD $SECURE_UPGRADE_SIGNING_CERT $SECURE_UPGRADE_DEV_SIGNING_KEY
 }
 
 # Generate asic-specific device list

installer/sharch_body.sh

@@ -11,7 +11,9 @@
 ##
 
 echo -n "Verifying image checksum ..."
-sha1=$(sed -e '1,/^exit_marker$/d' "$0" | sha1sum | awk '{ print $1 }')
+payload_image_size=%%PAYLOAD_IMAGE_SIZE%%
+
+sha1=$(sed -e '1,/^exit_marker$/d' "$0" | head -c $payload_image_size | sha1sum | awk '{ print $1 }')
 
 payload_sha1=%%IMAGE_SHA1%%
 
@@ -45,7 +47,9 @@ if [ "$(id -u)" = "0" ] ; then
 fi
 cd $tmp_dir
 echo -n "Preparing image archive ..."
-sed -e '1,/^exit_marker$/d' $archive_path | tar xf - || exit 1
+
+sed -e '1,/^exit_marker$/d' $archive_path | head -c $payload_image_size | tar xf - || exit 1
+
 echo " OK."
 cd $cur_wd
 if [ -n "$extract" ] ; then

onie-mk-demo.sh

@@ -14,6 +14,9 @@ output_file=$6
 demo_type=$7
 image_version=$8
 onie_image_part_size=$9
+onie_installer_payload=${10}
+cert_file=${11}
+key_file=${12}
 
 shift 9
 
@@ -100,7 +103,7 @@ sed -i -e "s/%%DEMO_TYPE%%/$demo_type/g" \
        -e "s@%%OUTPUT_RAW_IMAGE%%@$output_raw_image@" \
     $tmp_installdir/install.sh || clean_up 1
 echo -n "."
-cp -r $* $tmp_installdir || clean_up 1
+cp -r $onie_installer_payload $tmp_installdir || clean_up 1
 echo -n "."
 [ -r "$platform_conf" ] && {
     cp $platform_conf $tmp_installdir || clean_up 1
@@ -130,7 +133,50 @@ cp $installer_dir/sharch_body.sh $output_file || {
 # Replace variables in the sharch template
 sed -i -e "s/%%IMAGE_SHA1%%/$sha1/" $output_file
 echo -n "."
+tar_size="$(wc -c < "${sharch}")"
+sed -i -e "s|%%PAYLOAD_IMAGE_SIZE%%|${tar_size}|" ${output_file}
 cat $sharch >> $output_file
+echo "secure upgrade flags: SECURE_UPGRADE_MODE = $SECURE_UPGRADE_MODE, \
+SECURE_UPGRADE_DEV_SIGNING_KEY = $SECURE_UPGRADE_DEV_SIGNING_KEY, SECURE_UPGRADE_SIGNING_CERT = $SECURE_UPGRADE_SIGNING_CERT"
+
+if [ "$SECURE_UPGRADE_MODE" = "dev" -o "$SECURE_UPGRADE_MODE" = "prod" ]; then
+    CMS_SIG="${tmp_dir}/signature.sig"
+    DIR="$(dirname "$0")"
+    scripts_dir="${DIR}/scripts"
+    echo "$0 $SECURE_UPGRADE_MODE signing - creating CMS signature for ${output_file}. Output file ${CMS_SIG}"
+
+    if [ "$SECURE_UPGRADE_MODE" = "dev" ]; then
+        echo "$0 dev keyfile location: ${key_file}."
+        [ -f ${scripts_dir}/sign_image_dev.sh ] || {
+            echo "dev sign script ${scripts_dir}/sign_image_dev.sh not found"
+            rm -rf ${output_file}
+        }
+        (${scripts_dir}/sign_image_dev.sh ${cert_file} ${key_file} ${output_file} ${CMS_SIG}) || {
+            echo "CMS sign error $?"
+            rm -rf ${CMS_SIG} ${output_file}
+        }
+    else # "$SECURE_UPGRADE_MODE" has to be equal to "prod"
+        [ -f ${scripts_dir}/sign_image_${machine}.sh ] || {
+            echo "prod sign script ${scripts_dir}/sign_image_${machine}.sh not found"
+            rm -rf ${output_file}
+        }
+        (${scripts_dir}/sign_image_${machine}.sh ${output_file} ${CMS_SIG} ${SECURE_UPGRADE_MODE}) || {
+            echo "CMS sign error $?"
+            rm -rf ${CMS_SIG} ${output_file}
+        }
+    fi
+
+    [ -f "$CMS_SIG" ] || {
+         echo "Error: CMS signature not created - exiting without signing"
+         clean_up 1
+    }
+    # append signature to binary
+    cat ${CMS_SIG} >> ${output_file}
+    sudo rm -rf ${CMS_SIG}
+elif [ "$SECURE_UPGRADE_MODE" -ne "no_sign" ]; then
+    echo "SECURE_UPGRADE_MODE not defined or defined as $SECURE_UPGRADE_MODE - build without signing"
+fi
+
 rm -rf $tmp_dir
 echo " Done."
 

scripts/sign_image_dev.sh

@@ -0,0 +1,11 @@
+cert_file=$1
+key_file=$2
+image_to_sign=$3
+cms_sig_out=$4
+openssl cms -sign -nosmimecap -signer ${cert_file} -inkey ${key_file} -binary -in $image_to_sign -outform pem -out ${cms_sig_out} || {
+    echo "$?: CMS sign error"
+    sudo rm -rf ${cms_sig_out}
+    exit 1
+}
+echo "CMS sign OK"
+exit 0