Merge "Sign APKs using SHA-256 instead of SHA-1 when possible."
This commit is contained in:
Alex Klyubin
Gerrit Code Review
commit
b763b29267
4 changed files with 155 additions and 8 deletions
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@ -2213,11 +2213,21 @@ define add-carried-jack-resources
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fi
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endef
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# Returns the minSdkVersion of the specified APK as a decimal number. If the
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# version is a codename, returns the current platform SDK version (always a
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# decimal number) instead.
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#
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define get-package-min-sdk-version-int
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$$($(AAPT) dump badging $(1) 2>&1 | grep '^sdkVersion' | cut -d"'" -f2 | \
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sed -e s/^$(PLATFORM_VERSION_CODENAME)$$/$(PLATFORM_SDK_VERSION)/)
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endef
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# Sign a package using the specified key/cert.
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#
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define sign-package
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$(hide) mv $@ $@.unsigned
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$(hide) java -Djava.library.path=$(SIGNAPK_JNI_LIBRARY_PATH) -jar $(SIGNAPK_JAR) \
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--min-sdk-version $(call get-package-min-sdk-version-int,$@.unsigned) \
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$(PRIVATE_CERTIFICATE) $(PRIVATE_PRIVATE_KEY) \
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$(PRIVATE_ADDITIONAL_CERTIFICATES) $@.unsigned $@.signed
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$(hide) mv $@.signed $@
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@ -213,7 +213,7 @@ embedded_prebuilt_jni_libs := 'lib/*.so'
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endif
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$(built_module): PRIVATE_EMBEDDED_JNI_LIBS := $(embedded_prebuilt_jni_libs)
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$(built_module) : $(my_prebuilt_src_file) | $(ACP) $(ZIPALIGN) $(SIGNAPK_JAR)
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$(built_module) : $(my_prebuilt_src_file) | $(ACP) $(ZIPALIGN) $(SIGNAPK_JAR) $(AAPT)
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$(transform-prebuilt-to-target)
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$(uncompress-shared-libs)
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ifneq ($(LOCAL_CERTIFICATE),PRESIGNED)
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@ -252,7 +252,7 @@ my_src_dir := $(LOCAL_PATH)/$(my_src_dir)
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$(built_apk_splits) : PRIVATE_PRIVATE_KEY := $(LOCAL_CERTIFICATE).pk8
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$(built_apk_splits) : PRIVATE_CERTIFICATE := $(LOCAL_CERTIFICATE).x509.pem
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$(built_apk_splits) : $(built_module_path)/%.apk : $(my_src_dir)/%.apk | $(ACP)
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$(built_apk_splits) : $(built_module_path)/%.apk : $(my_src_dir)/%.apk | $(ACP) $(AAPT)
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$(copy-file-to-new-target)
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$(sign-package)
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@ -592,7 +592,46 @@ def GetKeyPasswords(keylist):
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return key_passwords
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def SignFile(input_name, output_name, key, password, whole_file=False):
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def GetMinSdkVersion(apk_name):
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"""Get the minSdkVersion delared in the APK. This can be both a decimal number
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(API Level) or a codename.
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"""
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p = Run(["aapt", "dump", "badging", apk_name], stdout=subprocess.PIPE)
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output, err = p.communicate()
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if err:
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raise ExternalError("Failed to obtain minSdkVersion: aapt return code %s"
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% (p.returncode,))
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for line in output.split("\n"):
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# Looking for lines such as sdkVersion:'23' or sdkVersion:'M'
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m = re.match(r'sdkVersion:\'([^\']*)\'', line)
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if m:
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return m.group(1)
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raise ExternalError("No minSdkVersion returned by aapt")
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def GetMinSdkVersionInt(apk_name, codename_to_api_level_map):
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"""Get the minSdkVersion declared in the APK as a number (API Level). If
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minSdkVersion is set to a codename, it is translated to a number using the
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provided map.
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"""
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version = GetMinSdkVersion(apk_name)
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try:
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return int(version)
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except ValueError:
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# Not a decimal number. Codename?
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if version in codename_to_api_level_map:
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return codename_to_api_level_map[version]
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else:
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raise ExternalError("Unknown minSdkVersion: '%s'. Known codenames: %s"
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% (version, codename_to_api_level_map))
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def SignFile(input_name, output_name, key, password, min_api_level=None,
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codename_to_api_level_map=dict(),
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whole_file=False):
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"""Sign the input_name zip/jar/apk, producing output_name. Use the
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given key and password (the latter may be None if the key does not
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have a password.
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@ -600,6 +639,13 @@ def SignFile(input_name, output_name, key, password, whole_file=False):
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If whole_file is true, use the "-w" option to SignApk to embed a
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signature that covers the whole file in the archive comment of the
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zip file.
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min_api_level is the API Level (int) of the oldest platform this file may end
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up on. If not specified for an APK, the API Level is obtained by interpreting
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the minSdkVersion attribute of the APK's AndroidManifest.xml.
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codename_to_api_level_map is needed to translate the codename which may be
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encountered as the APK's minSdkVersion.
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"""
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java_library_path = os.path.join(
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@ -612,6 +658,15 @@ def SignFile(input_name, output_name, key, password, whole_file=False):
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cmd.extend(OPTIONS.extra_signapk_args)
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if whole_file:
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cmd.append("-w")
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min_sdk_version = min_api_level
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if min_sdk_version is None:
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if not whole_file:
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min_sdk_version = GetMinSdkVersionInt(
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input_name, codename_to_api_level_map)
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if min_sdk_version is not None:
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cmd.extend(["--min-sdk-version", str(min_sdk_version)])
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cmd.extend([key + OPTIONS.public_key_suffix,
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key + OPTIONS.private_key_suffix,
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input_name, output_name])
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@ -127,14 +127,34 @@ def CheckAllApksSigned(input_tf_zip, apk_key_map):
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sys.exit(1)
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def SignApk(data, keyname, pw):
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def SignApk(data, keyname, pw, platform_api_level, codename_to_api_level_map):
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unsigned = tempfile.NamedTemporaryFile()
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unsigned.write(data)
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unsigned.flush()
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signed = tempfile.NamedTemporaryFile()
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common.SignFile(unsigned.name, signed.name, keyname, pw)
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# For pre-N builds, don't upgrade to SHA-256 JAR signatures based on the APK's
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# minSdkVersion to avoid increasing incremental OTA update sizes. If an APK
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# didn't change, we don't want its signature to change due to the switch
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# from SHA-1 to SHA-256.
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# By default, APK signer chooses SHA-256 signatures if the APK's minSdkVersion
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# is 18 or higher. For pre-N builds we disable this mechanism by pretending
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# that the APK's minSdkVersion is 1.
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# For N+ builds, we let APK signer rely on the APK's minSdkVersion to
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# determine whether to use SHA-256.
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min_api_level = None
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if platform_api_level > 23:
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# Let APK signer choose whether to use SHA-1 or SHA-256, based on the APK's
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# minSdkVersion attribute
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min_api_level = None
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else:
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# Force APK signer to use SHA-1
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min_api_level = 1
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common.SignFile(unsigned.name, signed.name, keyname, pw,
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min_api_level=min_api_level,
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codename_to_api_level_map=codename_to_api_level_map)
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data = signed.read()
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unsigned.close()
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@ -144,7 +164,8 @@ def SignApk(data, keyname, pw):
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def ProcessTargetFiles(input_tf_zip, output_tf_zip, misc_info,
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apk_key_map, key_passwords):
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apk_key_map, key_passwords, platform_api_level,
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codename_to_api_level_map):
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maxsize = max([len(os.path.basename(i.filename))
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for i in input_tf_zip.infolist()
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@ -200,7 +221,8 @@ def ProcessTargetFiles(input_tf_zip, output_tf_zip, misc_info,
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key = apk_key_map[name]
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if key not in common.SPECIAL_CERT_STRINGS:
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print " signing: %-*s (%s)" % (maxsize, name, key)
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signed_data = SignApk(data, key, key_passwords[key])
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signed_data = SignApk(data, key, key_passwords[key], platform_api_level,
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codename_to_api_level_map)
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common.ZipWriteStr(output_tf_zip, out_info, signed_data)
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else:
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# an APK we're not supposed to sign.
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@ -440,6 +462,57 @@ def BuildKeyMap(misc_info, key_mapping_options):
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OPTIONS.key_map[s] = d
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def GetApiLevelAndCodename(input_tf_zip):
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data = input_tf_zip.read("SYSTEM/build.prop")
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api_level = None
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codename = None
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for line in data.split("\n"):
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line = line.strip()
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original_line = line
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if line and line[0] != '#' and "=" in line:
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key, value = line.split("=", 1)
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key = key.strip()
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if key == "ro.build.version.sdk":
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api_level = int(value.strip())
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elif key == "ro.build.version.codename":
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codename = value.strip()
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if api_level is None:
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raise ValueError("No ro.build.version.sdk in SYSTEM/build.prop")
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if codename is None:
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raise ValueError("No ro.build.version.codename in SYSTEM/build.prop")
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return (api_level, codename)
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def GetCodenameToApiLevelMap(input_tf_zip):
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data = input_tf_zip.read("SYSTEM/build.prop")
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api_level = None
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codenames = None
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for line in data.split("\n"):
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line = line.strip()
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original_line = line
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if line and line[0] != '#' and "=" in line:
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key, value = line.split("=", 1)
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key = key.strip()
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if key == "ro.build.version.sdk":
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api_level = int(value.strip())
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elif key == "ro.build.version.all_codenames":
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codenames = value.strip().split(",")
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if api_level is None:
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raise ValueError("No ro.build.version.sdk in SYSTEM/build.prop")
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if codenames is None:
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raise ValueError("No ro.build.version.all_codenames in SYSTEM/build.prop")
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result = dict()
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for codename in codenames:
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codename = codename.strip()
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if len(codename) > 0:
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result[codename] = api_level
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return result
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def main(argv):
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key_mapping_options = []
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@ -498,8 +571,17 @@ def main(argv):
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CheckAllApksSigned(input_zip, apk_key_map)
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key_passwords = common.GetKeyPasswords(set(apk_key_map.values()))
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platform_api_level, platform_codename = GetApiLevelAndCodename(input_zip)
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codename_to_api_level_map = GetCodenameToApiLevelMap(input_zip)
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# Android N will be API Level 24, but isn't yet.
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# TODO: Remove this workaround once Android N is officially API Level 24.
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if platform_api_level == 23 and platform_codename == "N":
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platform_api_level = 24
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ProcessTargetFiles(input_zip, output_zip, misc_info,
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apk_key_map, key_passwords)
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apk_key_map, key_passwords,
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platform_api_level,
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codename_to_api_level_map)
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common.ZipClose(input_zip)
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common.ZipClose(output_zip)
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