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505 lines
15 KiB
505 lines
15 KiB
// Copyright (C) 2019 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package selinux
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import (
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"fmt"
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"io"
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"strings"
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"github.com/google/blueprint"
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"github.com/google/blueprint/proptools"
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"android/soong/android"
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"android/soong/sysprop"
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)
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type selinuxContextsProperties struct {
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// Filenames under sepolicy directories, which will be used to generate contexts file.
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Srcs []string `android:"path"`
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Product_variables struct {
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Debuggable struct {
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Srcs []string
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}
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Address_sanitize struct {
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Srcs []string
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}
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}
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// Whether reqd_mask directory is included to sepolicy directories or not.
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Reqd_mask *bool
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// Whether the comments in generated contexts file will be removed or not.
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Remove_comment *bool
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// Whether the result context file is sorted with fc_sort or not.
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Fc_sort *bool
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// Make this module available when building for recovery
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Recovery_available *bool
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}
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type fileContextsProperties struct {
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// flatten_apex can be used to specify additional sources of file_contexts.
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// Apex paths, /system/apex/{apex_name}, will be amended to the paths of file_contexts
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// entries.
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Flatten_apex struct {
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Srcs []string
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}
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}
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type selinuxContextsModule struct {
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android.ModuleBase
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properties selinuxContextsProperties
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fileContextsProperties fileContextsProperties
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build func(ctx android.ModuleContext, inputs android.Paths) android.Path
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deps func(ctx android.BottomUpMutatorContext)
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outputPath android.Path
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installPath android.InstallPath
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}
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var (
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reuseContextsDepTag = dependencyTag{name: "reuseContexts"}
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syspropLibraryDepTag = dependencyTag{name: "sysprop_library"}
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)
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func init() {
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pctx.HostBinToolVariable("fc_sort", "fc_sort")
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android.RegisterModuleType("file_contexts", fileFactory)
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android.RegisterModuleType("hwservice_contexts", hwServiceFactory)
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android.RegisterModuleType("property_contexts", propertyFactory)
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android.RegisterModuleType("service_contexts", serviceFactory)
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android.RegisterModuleType("keystore2_key_contexts", keystoreKeyFactory)
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}
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func (m *selinuxContextsModule) InstallInRoot() bool {
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return m.InRecovery()
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}
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func (m *selinuxContextsModule) InstallInRecovery() bool {
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// ModuleBase.InRecovery() checks the image variant
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return m.InRecovery()
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}
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func (m *selinuxContextsModule) onlyInRecovery() bool {
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// ModuleBase.InstallInRecovery() checks commonProperties.Recovery property
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return m.ModuleBase.InstallInRecovery()
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}
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func (m *selinuxContextsModule) DepsMutator(ctx android.BottomUpMutatorContext) {
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if m.deps != nil {
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m.deps(ctx)
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}
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if m.InRecovery() && !m.onlyInRecovery() {
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ctx.AddFarVariationDependencies([]blueprint.Variation{
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{Mutator: "image", Variation: android.CoreVariation},
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}, reuseContextsDepTag, ctx.ModuleName())
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}
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}
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func (m *selinuxContextsModule) propertyContextsDeps(ctx android.BottomUpMutatorContext) {
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for _, lib := range sysprop.SyspropLibraries(ctx.Config()) {
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ctx.AddFarVariationDependencies([]blueprint.Variation{}, syspropLibraryDepTag, lib)
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}
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}
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func (m *selinuxContextsModule) GenerateAndroidBuildActions(ctx android.ModuleContext) {
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if m.InRecovery() {
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// Installing context files at the root of the recovery partition
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m.installPath = android.PathForModuleInstall(ctx)
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} else {
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m.installPath = android.PathForModuleInstall(ctx, "etc", "selinux")
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}
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if m.InRecovery() && !m.onlyInRecovery() {
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dep := ctx.GetDirectDepWithTag(m.Name(), reuseContextsDepTag)
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if reuseDeps, ok := dep.(*selinuxContextsModule); ok {
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m.outputPath = reuseDeps.outputPath
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ctx.InstallFile(m.installPath, m.Name(), m.outputPath)
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return
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}
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}
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var inputs android.Paths
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ctx.VisitDirectDepsWithTag(android.SourceDepTag, func(dep android.Module) {
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segroup, ok := dep.(*fileGroup)
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if !ok {
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ctx.ModuleErrorf("srcs dependency %q is not an selinux filegroup",
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ctx.OtherModuleName(dep))
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return
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}
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if ctx.ProductSpecific() {
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inputs = append(inputs, segroup.ProductPrivateSrcs()...)
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} else if ctx.SocSpecific() {
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if ctx.DeviceConfig().BoardSepolicyVers() == ctx.DeviceConfig().PlatformSepolicyVersion() {
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inputs = append(inputs, segroup.SystemVendorSrcs()...)
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}
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inputs = append(inputs, segroup.VendorSrcs()...)
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} else if ctx.DeviceSpecific() {
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inputs = append(inputs, segroup.OdmSrcs()...)
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} else if ctx.SystemExtSpecific() {
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inputs = append(inputs, segroup.SystemExtPrivateSrcs()...)
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} else {
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inputs = append(inputs, segroup.SystemPrivateSrcs()...)
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inputs = append(inputs, segroup.SystemPublicSrcs()...)
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}
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if proptools.Bool(m.properties.Reqd_mask) {
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if ctx.SocSpecific() || ctx.DeviceSpecific() {
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inputs = append(inputs, segroup.VendorReqdMaskSrcs()...)
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} else {
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inputs = append(inputs, segroup.SystemReqdMaskSrcs()...)
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}
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}
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})
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for _, src := range m.properties.Srcs {
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// Module sources are handled above with VisitDirectDepsWithTag
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if android.SrcIsModule(src) == "" {
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inputs = append(inputs, android.PathForModuleSrc(ctx, src))
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}
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}
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m.outputPath = m.build(ctx, inputs)
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ctx.InstallFile(m.installPath, ctx.ModuleName(), m.outputPath)
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}
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func newModule() *selinuxContextsModule {
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m := &selinuxContextsModule{}
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m.AddProperties(
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&m.properties,
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)
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android.InitAndroidArchModule(m, android.DeviceSupported, android.MultilibCommon)
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android.AddLoadHook(m, func(ctx android.LoadHookContext) {
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m.selinuxContextsHook(ctx)
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})
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return m
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}
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func (m *selinuxContextsModule) selinuxContextsHook(ctx android.LoadHookContext) {
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// TODO: clean this up to use build/soong/android/variable.go after b/79249983
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var srcs []string
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if ctx.Config().Debuggable() {
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srcs = append(srcs, m.properties.Product_variables.Debuggable.Srcs...)
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}
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for _, sanitize := range ctx.Config().SanitizeDevice() {
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if sanitize == "address" {
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srcs = append(srcs, m.properties.Product_variables.Address_sanitize.Srcs...)
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break
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}
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}
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m.properties.Srcs = append(m.properties.Srcs, srcs...)
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}
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func (m *selinuxContextsModule) AndroidMk() android.AndroidMkData {
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return android.AndroidMkData{
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Custom: func(w io.Writer, name, prefix, moduleDir string, data android.AndroidMkData) {
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nameSuffix := ""
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if m.InRecovery() && !m.onlyInRecovery() {
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nameSuffix = ".recovery"
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}
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fmt.Fprintln(w, "\ninclude $(CLEAR_VARS)")
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fmt.Fprintln(w, "LOCAL_PATH :=", moduleDir)
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fmt.Fprintln(w, "LOCAL_MODULE :=", name+nameSuffix)
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data.Entries.WriteLicenseVariables(w)
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fmt.Fprintln(w, "LOCAL_MODULE_CLASS := ETC")
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if m.Owner() != "" {
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fmt.Fprintln(w, "LOCAL_MODULE_OWNER :=", m.Owner())
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}
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fmt.Fprintln(w, "LOCAL_MODULE_TAGS := optional")
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fmt.Fprintln(w, "LOCAL_PREBUILT_MODULE_FILE :=", m.outputPath.String())
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fmt.Fprintln(w, "LOCAL_MODULE_PATH :=", m.installPath.ToMakePath().String())
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fmt.Fprintln(w, "LOCAL_INSTALLED_MODULE_STEM :=", name)
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fmt.Fprintln(w, "include $(BUILD_PREBUILT)")
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},
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}
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}
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func (m *selinuxContextsModule) ImageMutatorBegin(ctx android.BaseModuleContext) {
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if proptools.Bool(m.properties.Recovery_available) && m.InstallInRecovery() {
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ctx.PropertyErrorf("recovery_available",
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"doesn't make sense at the same time as `recovery: true`")
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}
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}
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func (m *selinuxContextsModule) CoreVariantNeeded(ctx android.BaseModuleContext) bool {
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return !m.InstallInRecovery()
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}
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func (m *selinuxContextsModule) RamdiskVariantNeeded(ctx android.BaseModuleContext) bool {
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return false
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}
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func (m *selinuxContextsModule) VendorRamdiskVariantNeeded(ctx android.BaseModuleContext) bool {
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return false
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}
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func (m *selinuxContextsModule) DebugRamdiskVariantNeeded(ctx android.BaseModuleContext) bool {
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return false
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}
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func (m *selinuxContextsModule) RecoveryVariantNeeded(ctx android.BaseModuleContext) bool {
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return m.InstallInRecovery() || proptools.Bool(m.properties.Recovery_available)
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}
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func (m *selinuxContextsModule) ExtraImageVariations(ctx android.BaseModuleContext) []string {
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return nil
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}
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func (m *selinuxContextsModule) SetImageVariation(ctx android.BaseModuleContext, variation string, module android.Module) {
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}
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var _ android.ImageInterface = (*selinuxContextsModule)(nil)
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func (m *selinuxContextsModule) buildGeneralContexts(ctx android.ModuleContext, inputs android.Paths) android.Path {
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ret := android.PathForModuleGen(ctx, ctx.ModuleName()+"_m4out")
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rule := android.NewRuleBuilder(pctx, ctx)
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rule.Command().
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Tool(ctx.Config().PrebuiltBuildTool(ctx, "m4")).
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Text("--fatal-warnings -s").
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FlagForEachArg("-D", ctx.DeviceConfig().SepolicyM4Defs()).
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Inputs(inputs).
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FlagWithOutput("> ", ret)
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if proptools.Bool(m.properties.Remove_comment) {
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rule.Temporary(ret)
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remove_comment_output := android.PathForModuleGen(ctx, ctx.ModuleName()+"_remove_comment")
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rule.Command().
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Text("sed -e 's/#.*$//' -e '/^$/d'").
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Input(ret).
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FlagWithOutput("> ", remove_comment_output)
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ret = remove_comment_output
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}
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if proptools.Bool(m.properties.Fc_sort) {
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rule.Temporary(ret)
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sorted_output := android.PathForModuleGen(ctx, ctx.ModuleName()+"_sorted")
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rule.Command().
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Tool(ctx.Config().HostToolPath(ctx, "fc_sort")).
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FlagWithInput("-i ", ret).
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FlagWithOutput("-o ", sorted_output)
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ret = sorted_output
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}
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rule.Build("selinux_contexts", "building contexts: "+m.Name())
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rule.DeleteTemporaryFiles()
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return ret
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}
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func (m *selinuxContextsModule) buildFileContexts(ctx android.ModuleContext, inputs android.Paths) android.Path {
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if m.properties.Fc_sort == nil {
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m.properties.Fc_sort = proptools.BoolPtr(true)
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}
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rule := android.NewRuleBuilder(pctx, ctx)
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if ctx.Config().FlattenApex() {
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for _, src := range m.fileContextsProperties.Flatten_apex.Srcs {
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if m := android.SrcIsModule(src); m != "" {
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ctx.ModuleErrorf(
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"Module srcs dependency %q is not supported for flatten_apex.srcs", m)
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return nil
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}
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for _, path := range android.PathsForModuleSrcExcludes(ctx, []string{src}, nil) {
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out := android.PathForModuleGen(ctx, "flattened_apex", path.Rel())
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apex_path := "/system/apex/" + strings.Replace(
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strings.TrimSuffix(path.Base(), "-file_contexts"),
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".", "\\\\.", -1)
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rule.Command().
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Text("awk '/object_r/{printf(\""+apex_path+"%s\\n\",$0)}'").
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Input(path).
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FlagWithOutput("> ", out)
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inputs = append(inputs, out)
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}
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}
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}
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rule.Build(m.Name(), "flattened_apex_file_contexts")
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return m.buildGeneralContexts(ctx, inputs)
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}
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func fileFactory() android.Module {
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m := newModule()
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m.AddProperties(&m.fileContextsProperties)
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m.build = m.buildFileContexts
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return m
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}
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func (m *selinuxContextsModule) buildHwServiceContexts(ctx android.ModuleContext, inputs android.Paths) android.Path {
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if m.properties.Remove_comment == nil {
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m.properties.Remove_comment = proptools.BoolPtr(true)
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}
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return m.buildGeneralContexts(ctx, inputs)
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}
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func (m *selinuxContextsModule) checkVendorPropertyNamespace(ctx android.ModuleContext, inputs android.Paths) android.Paths {
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shippingApiLevel := ctx.DeviceConfig().ShippingApiLevel()
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ApiLevelR := android.ApiLevelOrPanic(ctx, "R")
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rule := android.NewRuleBuilder(pctx, ctx)
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// This list is from vts_treble_sys_prop_test.
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allowedPropertyPrefixes := []string{
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"ctl.odm.",
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"ctl.vendor.",
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"ctl.start$odm.",
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"ctl.start$vendor.",
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"ctl.stop$odm.",
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"ctl.stop$vendor.",
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"init.svc.odm.",
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"init.svc.vendor.",
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"ro.boot.",
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"ro.hardware.",
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"ro.odm.",
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"ro.vendor.",
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"odm.",
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"persist.odm.",
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"persist.vendor.",
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"vendor.",
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}
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// persist.camera is also allowed for devices launching with R or eariler
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if shippingApiLevel.LessThanOrEqualTo(ApiLevelR) {
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allowedPropertyPrefixes = append(allowedPropertyPrefixes, "persist.camera.")
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}
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var allowedContextPrefixes []string
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if shippingApiLevel.GreaterThanOrEqualTo(ApiLevelR) {
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// This list is from vts_treble_sys_prop_test.
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allowedContextPrefixes = []string{
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"vendor_",
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"odm_",
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}
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}
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var ret android.Paths
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for _, input := range inputs {
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cmd := rule.Command().
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BuiltTool("check_prop_prefix").
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FlagWithInput("--property-contexts ", input).
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FlagForEachArg("--allowed-property-prefix ", proptools.ShellEscapeList(allowedPropertyPrefixes)). // contains shell special character '$'
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FlagForEachArg("--allowed-context-prefix ", allowedContextPrefixes)
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if !ctx.DeviceConfig().BuildBrokenVendorPropertyNamespace() {
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cmd.Flag("--strict")
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}
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out := android.PathForModuleGen(ctx, "namespace_checked").Join(ctx, input.String())
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rule.Command().Text("cp -f").Input(input).Output(out)
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ret = append(ret, out)
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}
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rule.Build("check_namespace", "checking namespace of "+ctx.ModuleName())
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return ret
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}
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func (m *selinuxContextsModule) buildPropertyContexts(ctx android.ModuleContext, inputs android.Paths) android.Path {
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// vendor/odm properties are enforced for devices launching with Android Q or later. So, if
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// vendor/odm, make sure that only vendor/odm properties exist.
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shippingApiLevel := ctx.DeviceConfig().ShippingApiLevel()
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ApiLevelQ := android.ApiLevelOrPanic(ctx, "Q")
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if (ctx.SocSpecific() || ctx.DeviceSpecific()) && shippingApiLevel.GreaterThanOrEqualTo(ApiLevelQ) {
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inputs = m.checkVendorPropertyNamespace(ctx, inputs)
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}
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builtCtxFile := m.buildGeneralContexts(ctx, inputs)
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var apiFiles android.Paths
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ctx.VisitDirectDepsWithTag(syspropLibraryDepTag, func(c android.Module) {
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i, ok := c.(interface{ CurrentSyspropApiFile() android.OptionalPath })
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if !ok {
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panic(fmt.Errorf("unknown dependency %q for %q", ctx.OtherModuleName(c), ctx.ModuleName()))
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}
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if api := i.CurrentSyspropApiFile(); api.Valid() {
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apiFiles = append(apiFiles, api.Path())
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}
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})
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// check compatibility with sysprop_library
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if len(apiFiles) > 0 {
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out := android.PathForModuleGen(ctx, ctx.ModuleName()+"_api_checked")
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rule := android.NewRuleBuilder(pctx, ctx)
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msg := `\n******************************\n` +
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`API of sysprop_library doesn't match with property_contexts\n` +
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`Please fix the breakage and rebuild.\n` +
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`******************************\n`
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rule.Command().
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Text("( ").
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BuiltTool("sysprop_type_checker").
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FlagForEachInput("--api ", apiFiles).
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FlagWithInput("--context ", builtCtxFile).
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Text(" || ( echo").Flag("-e").
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Flag(`"` + msg + `"`).
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Text("; exit 38) )")
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rule.Command().Text("cp -f").Input(builtCtxFile).Output(out)
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rule.Build("property_contexts_check_api", "checking API: "+m.Name())
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builtCtxFile = out
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}
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return builtCtxFile
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}
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func hwServiceFactory() android.Module {
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m := newModule()
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m.build = m.buildHwServiceContexts
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return m
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}
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func propertyFactory() android.Module {
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m := newModule()
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m.build = m.buildPropertyContexts
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m.deps = m.propertyContextsDeps
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return m
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}
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func serviceFactory() android.Module {
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m := newModule()
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m.build = m.buildGeneralContexts
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return m
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}
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func keystoreKeyFactory() android.Module {
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m := newModule()
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m.build = m.buildGeneralContexts
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return m
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}
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