Ophestra
699c19e972
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Sharing and persisting these directories do not always make sense. Make it optional here. Closes #16. Signed-off-by: Ophestra <cat@gensokyo.uk>
331 lines
9.6 KiB
Go
331 lines
9.6 KiB
Go
package main
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import (
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"context"
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"encoding/json"
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"fmt"
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"io"
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"log"
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"os"
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"os/exec"
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"os/user"
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"strconv"
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"sync"
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"time"
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_ "unsafe"
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"hakurei.app/command"
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"hakurei.app/container/check"
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"hakurei.app/container/fhs"
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"hakurei.app/hst"
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"hakurei.app/internal"
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"hakurei.app/internal/app"
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"hakurei.app/internal/app/state"
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"hakurei.app/message"
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"hakurei.app/system/dbus"
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)
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//go:linkname optionalErrorUnwrap hakurei.app/container.optionalErrorUnwrap
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func optionalErrorUnwrap(_ error) error
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func buildCommand(ctx context.Context, msg message.Msg, early *earlyHardeningErrs, out io.Writer) command.Command {
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var (
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flagVerbose bool
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flagJSON bool
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)
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c := command.New(out, log.Printf, "hakurei", func([]string) error {
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msg.SwapVerbose(flagVerbose)
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if early.yamaLSM != nil {
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msg.Verbosef("cannot enable ptrace protection via Yama LSM: %v", early.yamaLSM)
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// not fatal
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}
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if early.dumpable != nil {
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log.Printf("cannot set SUID_DUMP_DISABLE: %s", early.dumpable)
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// not fatal
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}
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return nil
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}).
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Flag(&flagVerbose, "v", command.BoolFlag(false), "Increase log verbosity").
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Flag(&flagJSON, "json", command.BoolFlag(false), "Serialise output in JSON when applicable")
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c.Command("shim", command.UsageInternal, func([]string) error { app.ShimMain(); return errSuccess })
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c.Command("app", "Load and start container from configuration file", func(args []string) error {
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if len(args) < 1 {
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log.Fatal("app requires at least 1 argument")
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}
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// config extraArgs...
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config := tryPath(msg, args[0])
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if config != nil && config.Container != nil {
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config.Container.Args = append(config.Container.Args, args[1:]...)
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}
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app.Main(ctx, msg, config)
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panic("unreachable")
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})
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{
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var (
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flagDBusConfigSession string
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flagDBusConfigSystem string
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flagDBusMpris bool
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flagDBusVerbose bool
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flagID string
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flagIdentity int
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flagGroups command.RepeatableFlag
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flagHomeDir string
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flagUserName string
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flagPrivateRuntime, flagPrivateTmpdir bool
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flagWayland, flagX11, flagDBus, flagPulse bool
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)
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c.NewCommand("run", "Configure and start a permissive container", func(args []string) error {
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if flagIdentity < hst.IdentityMin || flagIdentity > hst.IdentityMax {
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log.Fatalf("identity %d out of range", flagIdentity)
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}
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// resolve home/username from os when flag is unset
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var (
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passwd *user.User
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passwdOnce sync.Once
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passwdFunc = func() {
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us := strconv.Itoa(app.HsuUid(new(app.Hsu).MustID(msg), flagIdentity))
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if u, err := user.LookupId(us); err != nil {
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msg.Verbosef("cannot look up uid %s", us)
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passwd = &user.User{
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Uid: us,
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Gid: us,
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Username: "chronos",
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Name: "Hakurei Permissive Default",
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HomeDir: fhs.VarEmpty,
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}
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} else {
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passwd = u
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}
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}
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)
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// paths are identical, resolve inner shell and program path
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shell := fhs.AbsRoot.Append("bin", "sh")
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if a, err := check.NewAbs(os.Getenv("SHELL")); err == nil {
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shell = a
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}
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progPath := shell
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if len(args) > 0 {
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if p, err := exec.LookPath(args[0]); err != nil {
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log.Fatal(optionalErrorUnwrap(err))
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return err
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} else if progPath, err = check.NewAbs(p); err != nil {
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log.Fatal(err.Error())
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return err
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}
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}
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var et hst.Enablement
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if flagWayland {
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et |= hst.EWayland
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}
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if flagX11 {
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et |= hst.EX11
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}
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if flagDBus {
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et |= hst.EDBus
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}
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if flagPulse {
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et |= hst.EPulse
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}
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config := &hst.Config{
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ID: flagID,
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Identity: flagIdentity,
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Groups: flagGroups,
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Enablements: hst.NewEnablements(et),
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Container: &hst.ContainerConfig{
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Filesystem: []hst.FilesystemConfigJSON{
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// autoroot, includes the home directory
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{FilesystemConfig: &hst.FSBind{
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Target: fhs.AbsRoot,
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Source: fhs.AbsRoot,
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Write: true,
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Special: true,
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}},
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},
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Username: flagUserName,
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Shell: shell,
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Path: progPath,
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Args: args,
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Flags: hst.FUserns | hst.FHostNet | hst.FHostAbstract | hst.FTty,
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},
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}
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// bind GPU stuff
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if et&(hst.EX11|hst.EWayland) != 0 {
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config.Container.Filesystem = append(config.Container.Filesystem, hst.FilesystemConfigJSON{FilesystemConfig: &hst.FSBind{
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Source: fhs.AbsDev.Append("dri"),
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Device: true,
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Optional: true,
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}})
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}
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config.Container.Filesystem = append(config.Container.Filesystem,
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// opportunistically bind kvm
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hst.FilesystemConfigJSON{FilesystemConfig: &hst.FSBind{
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Source: fhs.AbsDev.Append("kvm"),
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Device: true,
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Optional: true,
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}},
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// do autoetc last
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hst.FilesystemConfigJSON{FilesystemConfig: &hst.FSBind{
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Target: fhs.AbsEtc,
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Source: fhs.AbsEtc,
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Special: true,
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}},
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)
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if config.Container.Username == "chronos" {
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passwdOnce.Do(passwdFunc)
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config.Container.Username = passwd.Username
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}
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{
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homeDir := flagHomeDir
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if homeDir == "os" {
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passwdOnce.Do(passwdFunc)
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homeDir = passwd.HomeDir
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}
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if a, err := check.NewAbs(homeDir); err != nil {
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log.Fatal(err.Error())
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return err
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} else {
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config.Container.Home = a
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}
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}
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if !flagPrivateRuntime {
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config.Container.Flags |= hst.FShareRuntime
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}
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if !flagPrivateTmpdir {
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config.Container.Flags |= hst.FShareTmpdir
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}
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// parse D-Bus config file from flags if applicable
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if flagDBus {
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if flagDBusConfigSession == "builtin" {
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config.SessionBus = dbus.NewConfig(flagID, true, flagDBusMpris)
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} else {
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if f, err := os.Open(flagDBusConfigSession); err != nil {
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log.Fatal(err.Error())
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} else if err = json.NewDecoder(f).Decode(&config.SessionBus); err != nil {
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log.Fatalf("cannot load session bus proxy config from %q: %s", flagDBusConfigSession, err)
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}
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}
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// system bus proxy is optional
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if flagDBusConfigSystem != "nil" {
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if f, err := os.Open(flagDBusConfigSystem); err != nil {
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log.Fatal(err.Error())
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} else if err = json.NewDecoder(f).Decode(&config.SystemBus); err != nil {
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log.Fatalf("cannot load system bus proxy config from %q: %s", flagDBusConfigSystem, err)
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}
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}
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// override log from configuration
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if flagDBusVerbose {
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if config.SessionBus != nil {
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config.SessionBus.Log = true
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}
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if config.SystemBus != nil {
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config.SystemBus.Log = true
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}
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}
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}
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app.Main(ctx, msg, config)
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panic("unreachable")
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}).
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Flag(&flagDBusConfigSession, "dbus-config", command.StringFlag("builtin"),
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"Path to session bus proxy config file, or \"builtin\" for defaults").
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Flag(&flagDBusConfigSystem, "dbus-system", command.StringFlag("nil"),
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"Path to system bus proxy config file, or \"nil\" to disable").
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Flag(&flagDBusMpris, "mpris", command.BoolFlag(false),
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"Allow owning MPRIS D-Bus path, has no effect if custom config is available").
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Flag(&flagDBusVerbose, "dbus-log", command.BoolFlag(false),
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"Force buffered logging in the D-Bus proxy").
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Flag(&flagID, "id", command.StringFlag(""),
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"Reverse-DNS style Application identifier, leave empty to inherit instance identifier").
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Flag(&flagIdentity, "a", command.IntFlag(0),
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"Application identity").
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Flag(nil, "g", &flagGroups,
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"Groups inherited by all container processes").
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Flag(&flagHomeDir, "d", command.StringFlag("os"),
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"Container home directory").
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Flag(&flagUserName, "u", command.StringFlag("chronos"),
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"Passwd user name within sandbox").
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Flag(&flagPrivateRuntime, "private-runtime", command.BoolFlag(false),
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"Do not share XDG_RUNTIME_DIR between containers under the same identity").
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Flag(&flagPrivateTmpdir, "private-tmpdir", command.BoolFlag(false),
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"Do not share TMPDIR between containers under the same identity").
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Flag(&flagWayland, "wayland", command.BoolFlag(false),
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"Enable connection to Wayland via security-context-v1").
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Flag(&flagX11, "X", command.BoolFlag(false),
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"Enable direct connection to X11").
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Flag(&flagDBus, "dbus", command.BoolFlag(false),
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"Enable proxied connection to D-Bus").
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Flag(&flagPulse, "pulse", command.BoolFlag(false),
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"Enable direct connection to PulseAudio")
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}
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{
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var flagShort bool
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c.NewCommand("show", "Show live or local app configuration", func(args []string) error {
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switch len(args) {
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case 0: // system
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printShowSystem(os.Stdout, flagShort, flagJSON)
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case 1: // instance
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name := args[0]
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config, entry := tryShort(msg, name)
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if config == nil {
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config = tryPath(msg, name)
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}
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if !printShowInstance(os.Stdout, time.Now().UTC(), entry, config, flagShort, flagJSON) {
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os.Exit(1)
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}
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default:
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log.Fatal("show requires 1 argument")
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}
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return errSuccess
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}).Flag(&flagShort, "short", command.BoolFlag(false), "Omit filesystem information")
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}
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{
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var flagShort bool
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c.NewCommand("ps", "List active instances", func(args []string) error {
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var sc hst.Paths
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app.CopyPaths().Copy(&sc, new(app.Hsu).MustID(nil))
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printPs(os.Stdout, time.Now().UTC(), state.NewMulti(msg, sc.RunDirPath.String()), flagShort, flagJSON)
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return errSuccess
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}).Flag(&flagShort, "short", command.BoolFlag(false), "Print instance id")
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}
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c.Command("version", "Display version information", func(args []string) error { fmt.Println(internal.Version()); return errSuccess })
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c.Command("license", "Show full license text", func(args []string) error { fmt.Println(license); return errSuccess })
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c.Command("template", "Produce a config template", func(args []string) error { printJSON(os.Stdout, false, hst.Template()); return errSuccess })
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c.Command("help", "Show this help message", func([]string) error { c.PrintHelp(); return errSuccess })
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return c
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}
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