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clean up setup/launcher code and enable better control over shares

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In the past Wayland, X and PulseAudio are shared unconditionally. This can unnecessarily increase attack surface as some of these resources might not be needed at all. This commit moves all environment preparation code to the internal app package and selectively call them based on flags.

An "enablements" bitfield is introduced tracking all enabled shares. This value is registered after successful child process launch and stored in launcher states.

Code responsible for running the child process is isolated to its own app/run file and cleaned up. Launch method selection is also extensively cleaned up.

The internal state/track readLaunchers function now takes uid as an argument. Launcher state is now printed using text/tabwriter and argv is only emitted when verbose.

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>
This commit is contained in:
Ophestra 2024-09-08 02:24:01 +09:00
parent 58d3a1fbc7
commit 1906853382
Signed by: cat
SSH Key Fingerprint: SHA256:gQ67O0enBZ7UdZypgtspB2FDM1g3GVw8nX0XSdcFw8Q
14 changed files with 457 additions and 277 deletions
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22
cli.go
View File

@ -3,21 +3,33 @@ package main
import (
"flag"
"git.ophivana.moe/cat/fortify/internal/system"
"git.ophivana.moe/cat/fortify/internal/app"
)
var (
userName string
printVersion bool
mustWayland bool
mustX bool
mustDBus bool
mustPulse bool
flagVerbose bool
printVersion bool
)
func init() {
flag.StringVar(&userName, "u", "chronos", "Specify a username")
flag.BoolVar(&system.MethodFlags[0], "sudo", false, "Use 'sudo' to change user")
flag.BoolVar(&system.MethodFlags[1], "bare", false, "Use 'machinectl' but skip xdg-desktop-portal setup")
flag.BoolVar(&mustPulse, "pulse", false, "Treat unavailable PulseAudio as fatal")
flag.BoolVar(&mustWayland, "wayland", false, "Share Wayland socket")
flag.BoolVar(&mustX, "X", false, "Share X11 socket and allow connection")
flag.BoolVar(&mustDBus, "dbus", false, "Proxy D-Bus connection")
flag.BoolVar(&mustPulse, "pulse", false, "Share PulseAudio socket and cookie")
flag.BoolVar(&app.LaunchOptions[app.LaunchMethodSudo], "sudo", false, "Use 'sudo' to switch user")
flag.BoolVar(&app.LaunchOptions[app.LaunchMethodMachineCtl], "machinectl", true, "Use 'machinectl' to switch user")
flag.BoolVar(&app.LaunchOptions[app.LaunchBare], "bare", false, "Only set environment variables for child")
flag.BoolVar(&flagVerbose, "v", false, "Verbose output")
flag.BoolVar(&printVersion, "V", false, "Print version")
}

14
internal/app/dbus.go Normal file
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@ -0,0 +1,14 @@
package app
import (
"fmt"
"git.ophivana.moe/cat/fortify/internal/state"
)
func (a *App) ShareDBus() {
a.setEnablement(state.EnableDBus)
// TODO: start xdg-dbus-proxy
fmt.Println("warn: dbus proxy not implemented")
}

83
internal/app/launch.go
View File

@ -10,14 +10,10 @@ import (
"syscall"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal/system"
"git.ophivana.moe/cat/fortify/internal/util"
)
const (
sudoAskPass = "SUDO_ASKPASS"
launcherPayload = "FORTIFY_LAUNCHER_PAYLOAD"
)
const launcherPayload = "FORTIFY_LAUNCHER_PAYLOAD"
func (a *App) launcherPayloadEnv() string {
r := &bytes.Buffer{}
@ -75,80 +71,3 @@ func Early(printVersion bool) {
}
}
}
func (a *App) launchBySudo() (args []string) {
args = make([]string, 0, 4+len(a.env)+len(a.command))
// -Hiu $USER
args = append(args, "-Hiu", a.Username)
// -A?
if _, ok := os.LookupEnv(sudoAskPass); ok {
if system.V.Verbose {
fmt.Printf("%s set, adding askpass flag\n", sudoAskPass)
}
args = append(args, "-A")
}
// environ
args = append(args, a.env...)
// -- $@
args = append(args, "--")
args = append(args, a.command...)
return
}
func (a *App) launchByMachineCtl(bare bool) (args []string) {
args = make([]string, 0, 9+len(a.env))
// shell --uid=$USER
args = append(args, "shell", "--uid="+a.Username)
// --quiet
if !system.V.Verbose {
args = append(args, "--quiet")
}
// environ
envQ := make([]string, len(a.env)+1)
for i, e := range a.env {
envQ[i] = "-E" + e
}
envQ[len(a.env)] = "-E" + a.launcherPayloadEnv()
args = append(args, envQ...)
// -- .host
args = append(args, "--", ".host")
// /bin/sh -c
if sh, ok := util.Which("sh"); !ok {
state.Fatal("Did not find 'sh' in PATH")
} else {
args = append(args, sh, "-c")
}
if len(a.command) == 0 { // execute shell if command is not provided
a.command = []string{"$SHELL"}
}
innerCommand := strings.Builder{}
if !bare {
innerCommand.WriteString("dbus-update-activation-environment --systemd")
for _, e := range a.env {
innerCommand.WriteString(" " + strings.SplitN(e, "=", 2)[0])
}
innerCommand.WriteString("; systemctl --user start xdg-desktop-portal-gtk; ")
}
if executable, err := os.Executable(); err != nil {
state.Fatal("Error reading executable path:", err)
} else {
innerCommand.WriteString("exec " + executable + " -V")
}
args = append(args, innerCommand.String())
return
}

68
internal/app/pulse.go Normal file
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@ -0,0 +1,68 @@
package app
import (
"errors"
"fmt"
"io/fs"
"os"
"path"
"git.ophivana.moe/cat/fortify/internal/acl"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal/system"
"git.ophivana.moe/cat/fortify/internal/util"
)
func (a *App) SharePulse() {
a.setEnablement(state.EnablePulse)
// ensure PulseAudio directory ACL (e.g. `/run/user/%d/pulse`)
pulse := path.Join(system.V.Runtime, "pulse")
pulseS := path.Join(pulse, "native")
if s, err := os.Stat(pulse); err != nil {
if !errors.Is(err, fs.ErrNotExist) {
state.Fatal("Error accessing PulseAudio directory:", err)
}
state.Fatal(fmt.Sprintf("PulseAudio dir '%s' not found", pulse))
} else {
// add environment variable for new process
a.AppendEnv(util.PulseServer, "unix:"+pulseS)
if err = acl.UpdatePerm(pulse, a.UID(), acl.Execute); err != nil {
state.Fatal("Error preparing PulseAudio:", err)
} else {
state.RegisterRevertPath(pulse)
}
// ensure PulseAudio socket permission (e.g. `/run/user/%d/pulse/native`)
if s, err = os.Stat(pulseS); err != nil {
if errors.Is(err, fs.ErrNotExist) {
state.Fatal("PulseAudio directory found but socket does not exist")
}
state.Fatal("Error accessing PulseAudio socket:", err)
} else {
if m := s.Mode(); m&0o006 != 0o006 {
state.Fatal(fmt.Sprintf("Unexpected permissions on '%s':", pulseS), m)
}
}
// Publish current user's pulse-cookie for target user
pulseCookieSource := util.DiscoverPulseCookie()
pulseCookieFinal := path.Join(system.V.Share, "pulse-cookie")
a.AppendEnv(util.PulseCookie, pulseCookieFinal)
if system.V.Verbose {
fmt.Printf("Publishing PulseAudio cookie '%s' to '%s'\n", pulseCookieSource, pulseCookieFinal)
}
if err = util.CopyFile(pulseCookieFinal, pulseCookieSource); err != nil {
state.Fatal("Error copying PulseAudio cookie:", err)
}
if err = acl.UpdatePerm(pulseCookieFinal, a.UID(), acl.Read); err != nil {
state.Fatal("Error publishing PulseAudio cookie:", err)
} else {
state.RegisterRevertPath(pulseCookieFinal)
}
if system.V.Verbose {
fmt.Printf("PulseAudio dir '%s' configured\n", pulse)
}
}
}

178
internal/app/run.go Normal file
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@ -0,0 +1,178 @@
package app
import (
"errors"
"fmt"
"os"
"os/exec"
"strings"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal/system"
"git.ophivana.moe/cat/fortify/internal/util"
)
const (
term = "TERM"
sudoAskPass = "SUDO_ASKPASS"
)
const (
LaunchMethodSudo = iota
LaunchMethodMachineCtl
LaunchBare
launchOptionLength
)
var (
// LaunchOptions is set in main's cli.go
LaunchOptions [launchOptionLength]bool
)
func (a *App) Run() {
// pass $TERM to launcher
if t, ok := os.LookupEnv(term); ok {
a.AppendEnv(term, t)
}
commandBuilder := a.commandBuilderSudo
var toolPath string
// dependency checks
const sudoFallback = "Falling back to 'sudo', some desktop integration features may not work"
if LaunchOptions[LaunchMethodMachineCtl] && !LaunchOptions[LaunchMethodSudo] { // sudo argument takes priority
if !util.SdBooted() {
fmt.Println("This system was not booted through systemd")
fmt.Println(sudoFallback)
} else if machineCtlPath, ok := util.Which("machinectl"); !ok {
fmt.Println("Did not find 'machinectl' in PATH")
fmt.Println(sudoFallback)
} else {
toolPath = machineCtlPath
commandBuilder = a.commandBuilderMachineCtl
}
} else if sudoPath, ok := util.Which("sudo"); !ok {
state.Fatal("Did not find 'sudo' in PATH")
} else {
toolPath = sudoPath
}
if system.V.Verbose {
fmt.Printf("Selected launcher '%s' bare=%t\n", toolPath, LaunchOptions[LaunchBare])
}
cmd := exec.Command(toolPath, commandBuilder(LaunchOptions[LaunchBare])...)
cmd.Env = a.env
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Dir = system.V.RunDir
if system.V.Verbose {
fmt.Println("Executing:", cmd)
}
if err := cmd.Start(); err != nil {
state.Fatal("Error starting process:", err)
}
state.RegisterEnablement(a.enablements)
if err := state.SaveProcess(a.Uid, cmd); err != nil {
// process already started, shouldn't be fatal
fmt.Println("Error registering process:", err)
}
var r int
if err := cmd.Wait(); err != nil {
var exitError *exec.ExitError
if !errors.As(err, &exitError) {
state.Fatal("Error running process:", err)
}
}
if system.V.Verbose {
fmt.Println("Process exited with exit code", r)
}
state.BeforeExit()
os.Exit(r)
}
func (a *App) commandBuilderSudo(bare bool) (args []string) {
args = make([]string, 0, 4+len(a.env)+len(a.command))
// -Hiu $USER
args = append(args, "-Hiu", a.Username)
// -A?
if _, ok := os.LookupEnv(sudoAskPass); ok {
if system.V.Verbose {
fmt.Printf("%s set, adding askpass flag\n", sudoAskPass)
}
args = append(args, "-A")
}
// environ
args = append(args, a.env...)
// -- $@
args = append(args, "--")
args = append(args, a.command...)
return
}
func (a *App) commandBuilderMachineCtl(bare bool) (args []string) {
args = make([]string, 0, 9+len(a.env))
// shell --uid=$USER
args = append(args, "shell", "--uid="+a.Username)
// --quiet
if !system.V.Verbose {
args = append(args, "--quiet")
}
// environ
envQ := make([]string, len(a.env)+1)
for i, e := range a.env {
envQ[i] = "-E" + e
}
envQ[len(a.env)] = "-E" + a.launcherPayloadEnv()
args = append(args, envQ...)
// -- .host
args = append(args, "--", ".host")
// /bin/sh -c
if sh, ok := util.Which("sh"); !ok {
state.Fatal("Did not find 'sh' in PATH")
} else {
args = append(args, sh, "-c")
}
if len(a.command) == 0 { // execute shell if command is not provided
a.command = []string{"$SHELL"}
}
innerCommand := strings.Builder{}
if !bare {
innerCommand.WriteString("dbus-update-activation-environment --systemd")
for _, e := range a.env {
innerCommand.WriteString(" " + strings.SplitN(e, "=", 2)[0])
}
innerCommand.WriteString("; ")
//innerCommand.WriteString("systemctl --user start xdg-desktop-portal-gtk; ")
}
if executable, err := os.Executable(); err != nil {
state.Fatal("Error reading executable path:", err)
} else {
innerCommand.WriteString("exec " + executable + " -V")
}
args = append(args, innerCommand.String())
return
}

77
internal/app/setup.go
View File

@ -4,13 +4,11 @@ import (
"errors"
"fmt"
"os"
"os/exec"
"os/user"
"strconv"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal/system"
"git.ophivana.moe/cat/fortify/internal/util"
)
type App struct {
@ -18,78 +16,19 @@ type App struct {
env []string
command []string
enablements state.Enablements
*user.User
// absolutely *no* method of this type is thread-safe
// so don't treat it as if it is
}
func (a *App) Run() {
f := a.launchBySudo
m, b := false, false
switch {
case system.MethodFlags[0]: // sudo
case system.MethodFlags[1]: // bare
m, b = true, true
default: // machinectl
m, b = true, false
func (a *App) setEnablement(e state.Enablement) {
if a.enablements.Has(e) {
panic("enablement " + e.String() + " set twice")
}
var toolPath string
// dependency checks
const sudoFallback = "Falling back to 'sudo', some desktop integration features may not work"
if m {
if !util.SdBooted() {
fmt.Println("This system was not booted through systemd")
fmt.Println(sudoFallback)
} else if tp, ok := util.Which("machinectl"); !ok {
fmt.Println("Did not find 'machinectl' in PATH")
fmt.Println(sudoFallback)
} else {
toolPath = tp
f = func() []string { return a.launchByMachineCtl(b) }
}
} else if tp, ok := util.Which("sudo"); !ok {
state.Fatal("Did not find 'sudo' in PATH")
} else {
toolPath = tp
}
if system.V.Verbose {
fmt.Printf("Selected launcher '%s' bare=%t\n", toolPath, b)
}
cmd := exec.Command(toolPath, f()...)
cmd.Env = a.env
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Dir = system.V.RunDir
if system.V.Verbose {
fmt.Println("Executing:", cmd)
}
if err := cmd.Start(); err != nil {
state.Fatal("Error starting process:", err)
}
if err := state.SaveProcess(a.Uid, cmd); err != nil {
// process already started, shouldn't be fatal
fmt.Println("Error registering process:", err)
}
var r int
if err := cmd.Wait(); err != nil {
var exitError *exec.ExitError
if !errors.As(err, &exitError) {
state.Fatal("Error running process:", err)
}
}
if system.V.Verbose {
fmt.Println("Process exited with exit code", r)
}
state.BeforeExit()
os.Exit(r)
a.enablements |= e.Mask()
}
func New(userName string, args []string) *App {

39
internal/app/wayland.go Normal file
View File

@ -0,0 +1,39 @@
package app
import (
"fmt"
"os"
"path"
"git.ophivana.moe/cat/fortify/internal/acl"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal/system"
)
const (
// https://manpages.debian.org/experimental/libwayland-doc/wl_display_connect.3.en.html
waylandDisplay = "WAYLAND_DISPLAY"
)
func (a *App) ShareWayland() {
a.setEnablement(state.EnableWayland)
// ensure Wayland socket ACL (e.g. `/run/user/%d/wayland-%d`)
if w, ok := os.LookupEnv(waylandDisplay); !ok {
if system.V.Verbose {
fmt.Println("Wayland: WAYLAND_DISPLAY not set, skipping")
}
} else {
// add environment variable for new process
wp := path.Join(system.V.Runtime, w)
a.AppendEnv(waylandDisplay, wp)
if err := acl.UpdatePerm(wp, a.UID(), acl.Read, acl.Write, acl.Execute); err != nil {
state.Fatal(fmt.Sprintf("Error preparing Wayland '%s':", w), err)
} else {
state.RegisterRevertPath(wp)
}
if system.V.Verbose {
fmt.Printf("Wayland socket '%s' configured\n", w)
}
}
}

35
internal/app/x.go Normal file
View File

@ -0,0 +1,35 @@
package app
import (
"fmt"
"os"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal/system"
"git.ophivana.moe/cat/fortify/internal/xcb"
)
const display = "DISPLAY"
func (a *App) ShareX() {
a.setEnablement(state.EnableX)
// discovery X11 and grant user permission via the `ChangeHosts` command
if d, ok := os.LookupEnv(display); !ok {
if system.V.Verbose {
fmt.Println("X11: DISPLAY not set, skipping")
}
} else {
// add environment variable for new process
a.AppendEnv(display, d)
if system.V.Verbose {
fmt.Printf("X11: Adding XHost entry SI:localuser:%s to display '%s'\n", a.Username, d)
}
if err := xcb.ChangeHosts(xcb.HostModeInsert, xcb.FamilyServerInterpreted, "localuser\x00"+a.Username); err != nil {
state.Fatal(fmt.Sprintf("Error adding XHost entry to '%s':", d), err)
} else {
state.XcbActionComplete()
}
}
}

34
internal/state/enablement.go Normal file
View File

@ -0,0 +1,34 @@
package state
type (
Enablement uint8
Enablements uint64
)
const (
EnableWayland Enablement = iota
EnableX
EnableDBus
EnablePulse
enableLength
)
var enablementString = [enableLength]string{
"Wayland",
"X11",
"D-Bus",
"PulseAudio",
}
func (e Enablement) String() string {
return enablementString[e]
}
func (e Enablement) Mask() Enablements {
return 1 << e
}
func (es Enablements) Has(e Enablement) bool {
return es&e.Mask() != 0
}

2
internal/state/exit.go
View File

@ -33,7 +33,7 @@ func BeforeExit() {
}
}
if d, err := readLaunchers(); err != nil {
if d, err := readLaunchers(u.Uid); err != nil {
fmt.Println("Error reading active launchers:", err)
os.Exit(1)
} else if len(d) > 0 {

7
internal/state/register.go
View File

@ -4,6 +4,13 @@ func RegisterRevertPath(p string) {
cleanupCandidate = append(cleanupCandidate, p)
}
func RegisterEnablement(e Enablements) {
if enablements != nil {
panic("enablement state set twice")
}
enablements = &e
}
func XcbActionComplete() {
if xcbActionComplete {
Fatal("xcb inserted twice")

41
internal/state/track.go
View File

@ -10,6 +10,8 @@ import (
"os/exec"
"path"
"strconv"
"strings"
"text/tabwriter"
"git.ophivana.moe/cat/fortify/internal/system"
)
@ -22,6 +24,7 @@ var (
statePath string
cleanupCandidate []string
xcbActionComplete bool
enablements *Enablements
)
type launcherState struct {
@ -29,6 +32,7 @@ type launcherState struct {
Launcher string
Argv []string
Command []string
Capability Enablements
}
func init() {
@ -40,15 +44,41 @@ func Early() {
return
}
launchers, err := readLaunchers()
launchers, err := readLaunchers(u.Uid)
if err != nil {
fmt.Println("Error reading launchers:", err)
os.Exit(1)
}
fmt.Println("\tPID\tLauncher")
stdout := tabwriter.NewWriter(os.Stdout, 0, 1, 4, ' ', 0)
if !system.V.Verbose {
_, _ = fmt.Fprintln(stdout, "\tPID\tEnablements\tLauncher\tCommand")
} else {
_, _ = fmt.Fprintln(stdout, "\tPID\tArgv")
}
for _, state := range launchers {
fmt.Printf("\t%d\t%s\nCommand: %s\nArgv: %s\n", state.PID, state.Launcher, state.Command, state.Argv)
enablementsDescription := strings.Builder{}
for i := Enablement(0); i < enableLength; i++ {
if state.Capability.Has(i) {
enablementsDescription.WriteString(", " + i.String())
}
}
if enablementsDescription.Len() == 0 {
enablementsDescription.WriteString("none")
}
if !system.V.Verbose {
_, _ = fmt.Fprintf(stdout, "\t%d\t%s\t%s\t%s\n",
state.PID, strings.TrimPrefix(enablementsDescription.String(), ", "), state.Launcher,
state.Command)
} else {
_, _ = fmt.Fprintf(stdout, "\t%d\t%s\n",
state.PID, state.Argv)
}
}
if err = stdout.Flush(); err != nil {
fmt.Println("warn: error formatting output:", err)
}
os.Exit(0)
@ -62,6 +92,7 @@ func SaveProcess(uid string, cmd *exec.Cmd) error {
Launcher: cmd.Path,
Argv: cmd.Args,
Command: command,
Capability: *enablements,
}
if err := os.Mkdir(path.Join(system.V.RunDir, uid), 0700); err != nil && !errors.Is(err, fs.ErrExist) {
@ -81,10 +112,10 @@ func SaveProcess(uid string, cmd *exec.Cmd) error {
}
}
func readLaunchers() ([]*launcherState, error) {
func readLaunchers(uid string) ([]*launcherState, error) {
var f *os.File
var r []*launcherState
launcherPrefix := path.Join(system.V.RunDir, u.Uid)
launcherPrefix := path.Join(system.V.RunDir, uid)
if pl, err := os.ReadDir(launcherPrefix); err != nil {
return nil, err

5
internal/system/value.go
View File

@ -11,7 +11,4 @@ type Values struct {
Verbose bool
}
var (
V *Values
MethodFlags [2]bool
)
var V *Values

109
main.go
View File

@ -6,7 +6,6 @@ import (
"fmt"
"io/fs"
"os"
"path"
"strconv"
"syscall"
@ -14,8 +13,6 @@ import (
"git.ophivana.moe/cat/fortify/internal/app"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal/system"
"git.ophivana.moe/cat/fortify/internal/util"
"git.ophivana.moe/cat/fortify/internal/xcb"
)
var (
@ -30,14 +27,6 @@ func tryVersion() {
}
}
const (
term = "TERM"
display = "DISPLAY"
// https://manpages.debian.org/experimental/libwayland-doc/wl_display_connect.3.en.html
waylandDisplay = "WAYLAND_DISPLAY"
)
func main() {
flag.Parse()
@ -105,102 +94,20 @@ func main() {
}
}
// ensure Wayland socket ACL (e.g. `/run/user/%d/wayland-%d`)
if w, ok := os.LookupEnv(waylandDisplay); !ok {
if system.V.Verbose {
fmt.Println("Wayland: WAYLAND_DISPLAY not set, skipping")
}
} else {
// add environment variable for new process
wp := path.Join(system.V.Runtime, w)
a.AppendEnv(waylandDisplay, wp)
if err := acl.UpdatePerm(wp, a.UID(), acl.Read, acl.Write, acl.Execute); err != nil {
state.Fatal(fmt.Sprintf("Error preparing Wayland '%s':", w), err)
} else {
state.RegisterRevertPath(wp)
}
if system.V.Verbose {
fmt.Printf("Wayland socket '%s' configured\n", w)
}
if mustWayland {
a.ShareWayland()
}
// discovery X11 and grant user permission via the `ChangeHosts` command
if d, ok := os.LookupEnv(display); !ok {
if system.V.Verbose {
fmt.Println("X11: DISPLAY not set, skipping")
}
} else {
// add environment variable for new process
a.AppendEnv(display, d)
if system.V.Verbose {
fmt.Printf("X11: Adding XHost entry SI:localuser:%s to display '%s'\n", a.Username, d)
}
if err := xcb.ChangeHosts(xcb.HostModeInsert, xcb.FamilyServerInterpreted, "localuser\x00"+a.Username); err != nil {
state.Fatal(fmt.Sprintf("Error adding XHost entry to '%s':", d), err)
} else {
state.XcbActionComplete()
}
if mustX {
a.ShareX()
}
// ensure PulseAudio directory ACL (e.g. `/run/user/%d/pulse`)
pulse := path.Join(system.V.Runtime, "pulse")
pulseS := path.Join(pulse, "native")
if s, err := os.Stat(pulse); err != nil {
if !errors.Is(err, fs.ErrNotExist) {
state.Fatal("Error accessing PulseAudio directory:", err)
if mustDBus {
a.ShareDBus()
}
if mustPulse {
state.Fatal("PulseAudio is unavailable")
}
if system.V.Verbose {
fmt.Printf("PulseAudio dir '%s' not found, skipping\n", pulse)
}
} else {
// add environment variable for new process
a.AppendEnv(util.PulseServer, "unix:"+pulseS)
if err = acl.UpdatePerm(pulse, a.UID(), acl.Execute); err != nil {
state.Fatal("Error preparing PulseAudio:", err)
} else {
state.RegisterRevertPath(pulse)
}
// ensure PulseAudio socket permission (e.g. `/run/user/%d/pulse/native`)
if s, err = os.Stat(pulseS); err != nil {
if errors.Is(err, fs.ErrNotExist) {
state.Fatal("PulseAudio directory found but socket does not exist")
}
state.Fatal("Error accessing PulseAudio socket:", err)
} else {
if m := s.Mode(); m&0o006 != 0o006 {
state.Fatal(fmt.Sprintf("Unexpected permissions on '%s':", pulseS), m)
}
}
// Publish current user's pulse-cookie for target user
pulseCookieSource := util.DiscoverPulseCookie()
pulseCookieFinal := path.Join(system.V.Share, "pulse-cookie")
a.AppendEnv(util.PulseCookie, pulseCookieFinal)
if system.V.Verbose {
fmt.Printf("Publishing PulseAudio cookie '%s' to '%s'\n", pulseCookieSource, pulseCookieFinal)
}
if err = util.CopyFile(pulseCookieFinal, pulseCookieSource); err != nil {
state.Fatal("Error copying PulseAudio cookie:", err)
}
if err = acl.UpdatePerm(pulseCookieFinal, a.UID(), acl.Read); err != nil {
state.Fatal("Error publishing PulseAudio cookie:", err)
} else {
state.RegisterRevertPath(pulseCookieFinal)
}
if system.V.Verbose {
fmt.Printf("PulseAudio dir '%s' configured\n", pulse)
}
}
// pass $TERM to launcher
if t, ok := os.LookupEnv(term); ok {
a.AppendEnv(term, t)
a.SharePulse()
}
a.Run()