Add script to sign Android image

sign_android_image.sh is the main script that signs the image. It makes
similar changes to an image like the Android official signing tool
(sign_target_files_apks.py) does, but more Chrome OS specific.

TEST=./sign_official_build.sh recovery recovery_image.bin \
         ../../tests/devkeys/ out_img
TEST=Same above but with a recovery image without Android image.
     Android signing was skipping.
TEST=Same above but with a M53 image.  Android signing was skipped.
TEST=Unpack the image and diff the before and after.  Looks correct.
BUG=b:29915721

Change-Id: I0ae5f0ad8d2b05e485d60262558517ea563bf527
Reviewed-on: https://chromium-review.googlesource.com/366794
Commit-Ready: Victor Hsieh <victorhsieh@chromium.org>
Tested-by: Victor Hsieh <victorhsieh@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>

11 files changed, 408 insertions, 0 deletions

diff --git a/scripts/image_signing/sign_android_image.sh b/scripts/image_signing/sign_android_image.sh
new file mode 100755
index 00000000..6f999793
--- /dev/null
+++ b/scripts/image_signing/sign_android_image.sh
@@ -0,0 +1,219 @@
+#!/bin/bash
+
+# Copyright 2016 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+. "$(dirname "$0")/common.sh"
+
+set -e
+
+keytool_bin="/usr/local/buildtools/java/jdk/bin/keytool"
+
+# Print usage string
+usage() {
+  cat <<EOF
+Usage: $PROG /path/to/cros_root_fs/dir /path/to/keys/dir
+
+Re-sign framework apks in an Android system image.  The image itself does not
+need to be signed since it is shipped with Chrome OS image, which is already
+signed.
+
+Android has many "framework apks" that are signed with 4 different framework
+keys, depends on the purpose of the apk.  During development, apks are signed
+with the debug one.  This script is to re-sign those apks with corresponding
+release key.  It also handles some of the consequences of the key changes, such
+as sepolicy update.
+
+EOF
+  if [[ $# -gt 0 ]]; then
+    error "$*"
+    exit 1
+  fi
+  exit 0
+}
+
+# Return name according to the current signing debug key.  The name is used to
+# select key files.
+choose_key() {
+  local apk="$1"
+
+  local sha1=$(unzip -p "${apk}" META-INF/CERT.RSA | \
+      "${keytool_bin}" -printcert | awk '/^\s*SHA1:/ {print $2}')
+
+  # Fingerprints below are generated by:
+  # $ keytool -file vendor/google/certs/cheetskeys/$NAME.x509.pem -printcert \
+  #     | grep SHA1:
+  case "${sha1}" in
+    "AA:04:E0:5F:82:9C:7E:D1:B9:F8:FC:99:6C:5A:54:43:83:D9:F5:BC")
+      echo "platform"
+      ;;
+    "D4:C4:2D:E0:B9:1B:15:72:FA:7D:A7:21:E0:A6:09:94:B4:4C:B5:AE")
+      echo "media"
+      ;;
+    "38:B6:2C:E1:75:98:E3:E1:1C:CC:F6:6B:83:BB:97:0E:2D:40:6C:AE")
+      echo "shared"
+      ;;
+    "EC:63:36:20:23:B7:CB:66:18:70:D3:39:3C:A9:AE:7E:EF:A9:32:42")
+      # The above fingerprint is from devkey.  Translate to releasekey.
+      echo "releasekey"
+      ;;
+    *)
+      # Not a framework apk.  Do not re-sign.
+      echo ""
+      ;;
+  esac
+}
+
+# Re-sign framework apks with the corresponding release keys.  Only apk with
+# known key fingerprint are re-signed.  We should not re-sign non-framework
+# apks.
+sign_framework_apks() {
+  local system_mnt="$1"
+  local key_dir="$2"
+
+  info "Start signing framework apks"
+
+  # Counters for sanity check.
+  local counter_platform=0
+  local counter_media=0
+  local counter_shared=0
+  local counter_releasekey=0
+  local counter_total=0
+
+  local apk
+  while read -d $'\0' -r apk; do
+    local keyname=$(choose_key "${apk}")
+    if [[ -z "${keyname}" ]]; then
+      continue
+    fi
+
+    info "Re-signing (${keyname}) ${apk}"
+
+    local temp_dir="$(make_temp_dir)"
+    local temp_apk="${temp_dir}/temp.apk"
+    local signed_apk="${temp_dir}/signed.apk"
+    local aligned_apk="${temp_dir}/aligned.apk"
+
+    # Follow the standard manual signing process.  See
+    # https://developer.android.com/studio/publish/app-signing.html.
+    cp "${apk}" "${temp_apk}"
+    # Explicitly remove existing signature.
+    zip -q "${temp_apk}" -d "META-INF/*"
+    signapk "${key_dir}/$keyname.x509.pem" "${key_dir}/$keyname.pk8" \
+        "${temp_apk}" "${signed_apk}" > /dev/null
+    zipalign 4 "${signed_apk}" "${aligned_apk}"
+
+    sudo mv -f "${aligned_apk}" "${apk}"
+
+    : $(( counter_${keyname} += 1 ))
+    : $(( counter_total += 1 ))
+  done < <(find "${system_mnt}/system" -type f -name '*.apk' -print0)
+
+  # Sanity check.
+  if [[ ${counter_platform} -lt 2 || ${counter_media} -lt 2 ||
+        ${counter_shared} -lt 2 || ${counter_releasekey} -lt 2 ||
+        ${counter_total} -lt 25 ]]; then
+    die "Number of re-signed package seems to be wrong"
+  fi
+}
+
+# Platform key is part of the SELinux policy.  Since we are re-signing framework
+# apks, we need to replace the key in the policy as well.
+update_sepolicy() {
+  local system_mnt=$1
+  local key_dir=$2
+
+  # Only platform is used at this time.
+  local public_platform_key="${key_dir}/platform.x509.pem"
+
+  info "Start updating sepolicy"
+
+  local new_cert=$(sed -E '/(BEGIN|END) CERTIFICATE/d' \
+    "${public_platform_key}" | tr -d '\n' \
+    | base64 --decode | hexdump -v -e '/1 "%02x"')
+
+  if [[ -z "${new_cert}" ]]; then
+    die "Unable to get the public platform key"
+  fi
+
+  local output=$(make_temp_file)
+  local xml="${system_mnt}/system/etc/security/mac_permissions.xml"
+  local pattern='(<signer signature=")\w+("><seinfo value="platform)'
+  sed -E "s/${pattern}/\1${new_cert}"'\2/g' "${xml}" > "${output}"
+
+  # Sanity check.
+  if cmp "${xml}" "${output}"; then
+    die "Failed to replace SELinux policy cert"
+  fi
+
+  sudo mv -f "${output}" "${xml}"
+}
+
+# Replace the debug key in OTA cert with release key.
+replace_ota_cert() {
+  local system_mnt=$1
+  local release_cert=$2
+  local ota_zip="${system_mnt}/system/etc/security/otacerts.zip"
+
+  info "Replacing OTA cert"
+
+  local temp_dir=$(make_temp_dir)
+  pushd "${temp_dir}" > /dev/null
+  cp "${release_cert}" .
+  sudo rm "${ota_zip}"
+  sudo zip -q -r "${ota_zip}" .
+  popd > /dev/null
+}
+
+# Restore SELinux context.  This has to run after all file changes, before
+# creating the new squashfs image.
+reapply_file_security_context() {
+  local system_mnt=$1
+  local root_fs_dir=$2
+
+  info "Reapplying file security context"
+
+  sudo /sbin/setfiles -v -r "${system_mnt}" \
+      "${root_fs_dir}/etc/selinux/arc/contexts/files/android_file_contexts" \
+      "${system_mnt}"
+}
+
+main() {
+  local root_fs_dir=$1
+  local key_dir=$2
+  local android_dir="${root_fs_dir}/opt/google/containers/android"
+  local system_img="${android_dir}/system.raw.img"
+
+  if [[ $# -ne 2 ]]; then
+    usage "command takes exactly 2 args"
+  fi
+
+  if [[ ! -f "${system_img}" ]]; then
+    die "System image does not exist: ${system_img}"
+  fi
+
+  local working_dir=$(make_temp_dir)
+  local system_mnt="${working_dir}/mnt"
+
+  info "Unpacking sqaushfs image to ${system_img}"
+  sudo unsquashfs -f -d "${system_mnt}" "${system_img}"
+
+  sign_framework_apks "${system_mnt}" "${key_dir}"
+  update_sepolicy "${system_mnt}" "${key_dir}"
+  replace_ota_cert "${system_mnt}" "${key_dir}/releasekey.x509.pem"
+  reapply_file_security_context "${system_mnt}" "${root_fs_dir}"
+
+  info "Repacking sqaushfs image"
+
+  local new_system_img="${working_dir}/system.raw.img"
+  sudo mksquashfs "${system_mnt}" "${new_system_img}" -comp lzo
+
+  local old_size=$(stat -c '%s' "${system_img}")
+  local new_size=$(stat -c '%s' "${new_system_img}")
+  info "Android system image size change: ${old_size} -> ${new_size}"
+
+  sudo mv -f "${new_system_img}" "${system_img}"
+}
+
+main "$@"
diff --git a/scripts/image_signing/sign_official_build.sh b/scripts/image_signing/sign_official_build.sh
index 4f3407ef..badfaa92 100755
--- a/scripts/image_signing/sign_official_build.sh
+++ b/scripts/image_signing/sign_official_build.sh
@@ -590,6 +590,35 @@ resign_firmware_payload() {
   echo "Re-signed firmware AU payload in $image"
 }
 
+# Re-sign Android image if exists.
+resign_android_image_if_exists() {
+  local image=$1
+
+  local rootfs_dir=$(make_temp_dir)
+  mount_image_partition "${image}" 3 "${rootfs_dir}"
+
+  local system_img="${rootfs_dir}/opt/google/containers/android/system.raw.img"
+
+  if [[ ! -e "${system_img}" ]]; then
+    info "Android image not found.  Not signing Android APKs."
+    sudo umount "${rootfs_dir}"
+    return
+  fi
+
+  # Sign only 54+ images to make sure it works on dev channel first.
+  local milestone=$(grep CHROMEOS_RELEASE_CHROME_MILESTONE= \
+    "${rootfs_dir}/etc/lsb-release" | cut -d= -f2)
+  if [[ "${milestone}" -le 53 ]]; then
+    info "Not signing Android apks before 53 (incl.).  Current: ${milestone}."
+    return
+  fi
+
+  "${SCRIPT_DIR}/sign_android_image.sh" "${rootfs_dir}" "${KEY_DIR}/android"
+
+  sudo umount "${rootfs_dir}"
+  echo "Re-signed Android image"
+}
+
 # Verify an image including rootfs hash using the specified keys.
 verify_image() {
   local rootfs_image=$(make_temp_file)
@@ -772,6 +801,7 @@ sign_image_file() {
   echo "Preparing ${image_type} image..."
   cp --sparse=always "${input}" "${output}"
   resign_firmware_payload "${output}"
+  resign_android_image_if_exists "${output}"
   # We do NOT strip /boot for factory installer, since some devices need it to
   # boot EFI. crbug.com/260512 would obsolete this requirement.
   #
diff --git a/scripts/keygeneration/create_new_android_keys.sh b/scripts/keygeneration/create_new_android_keys.sh
new file mode 100755
index 00000000..a233a97a
--- /dev/null
+++ b/scripts/keygeneration/create_new_android_keys.sh
@@ -0,0 +1,63 @@
+#!/bin/bash
+
+# Copyright 2016 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+set -e
+
+usage() {
+  cat <<EOF
+Usage: $0 DIR
+
+Generate Android's 4 framework key pairs at DIR.  For detail, please refer to
+"Certificates and private keys" and "Manually generating keys" in
+https://source.android.com/devices/tech/ota/sign_builds.html.
+
+EOF
+
+  if [[ $# -ne 0 ]]; then
+    echo "ERROR: $*" >&2
+    exit 1
+  else
+    exit 0
+  fi
+}
+
+# Use the same SUBJECT used in Nexus.
+SUBJECT='/C=US/ST=California/L=Mountain View/O=Google Inc./OU=Android/CN=Android'
+
+# Generate .pk8 and .x509.pem at the given directory.
+make_pair() {
+  local dir=$1
+  local name=$2
+
+  # Generate RSA key.
+  openssl genrsa -3 -out "${dir}/temp.pem" 2048
+
+  # Create a certificate with the public part of the key.
+  openssl req -new -x509 -key "${dir}/temp.pem" -out "${dir}/${name}.x509.pem" \
+    -days 10000 -subj "${SUBJECT}"
+
+  # Create a PKCS#8-formatted version of the private key.
+  openssl pkcs8 -in "${dir}/temp.pem" -topk8 -outform DER \
+    -out "${dir}/${name}.pk8" -nocrypt
+
+  # Best attempt to securely delete the temp.pem file.
+  shred --remove "${dir}/temp.pem"
+}
+
+main() {
+  if [[ $# -ne 1 ]]; then
+    usage "Invalid argument."
+  fi
+
+  local dir=$1
+
+  make_pair "${dir}" platform
+  make_pair "${dir}" shared
+  make_pair "${dir}" media
+  make_pair "${dir}" releasekey
+}
+
+main "$@"
diff --git a/tests/devkeys/android/media.pk8 b/tests/devkeys/android/media.pk8
new file mode 100644
index 00000000..53fb2531
--- /dev/null
+++ b/tests/devkeys/android/media.pk8
diff --git a/tests/devkeys/android/media.x509.pem b/tests/devkeys/android/media.x509.pem
new file mode 100644
index 00000000..d3ec5bed
--- /dev/null
+++ b/tests/devkeys/android/media.x509.pem
@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----
+MIID/TCCAuWgAwIBAgIJAMi4UJBVFupsMA0GCSqGSIb3DQEBBQUAMIGUMQswCQYD
+VQQGEwJVUzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNTW91bnRhaW4g
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+1Ol/AEBSc6LFhA3Inj6xHoI=
+-----END CERTIFICATE-----
diff --git a/tests/devkeys/android/platform.pk8 b/tests/devkeys/android/platform.pk8
new file mode 100644
index 00000000..7b615ecb
--- /dev/null
+++ b/tests/devkeys/android/platform.pk8
diff --git a/tests/devkeys/android/platform.x509.pem b/tests/devkeys/android/platform.x509.pem
new file mode 100644
index 00000000..8b422ac7
--- /dev/null
+++ b/tests/devkeys/android/platform.x509.pem
@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----
+MIID/TCCAuWgAwIBAgIJAKsh6Cqx4cjwMA0GCSqGSIb3DQEBBQUAMIGUMQswCQYD
+VQQGEwJVUzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNTW91bnRhaW4g
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+z3jF4S6UhxYQ93pmqvI0pKI=
+-----END CERTIFICATE-----
diff --git a/tests/devkeys/android/releasekey.pk8 b/tests/devkeys/android/releasekey.pk8
new file mode 100644
index 00000000..502b5d98
--- /dev/null
+++ b/tests/devkeys/android/releasekey.pk8
diff --git a/tests/devkeys/android/releasekey.x509.pem b/tests/devkeys/android/releasekey.x509.pem
new file mode 100644
index 00000000..e3750265
--- /dev/null
+++ b/tests/devkeys/android/releasekey.x509.pem
@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----
+MIID/TCCAuWgAwIBAgIJAOP6XMUWw6ovMA0GCSqGSIb3DQEBBQUAMIGUMQswCQYD
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+-----END CERTIFICATE-----
diff --git a/tests/devkeys/android/shared.pk8 b/tests/devkeys/android/shared.pk8
new file mode 100644
index 00000000..9403f0f8
--- /dev/null
+++ b/tests/devkeys/android/shared.pk8
diff --git a/tests/devkeys/android/shared.x509.pem b/tests/devkeys/android/shared.x509.pem
new file mode 100644
index 00000000..63bc602d
--- /dev/null
+++ b/tests/devkeys/android/shared.x509.pem
@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----