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exit: move final and early code to internal package 

Exit cleanup state information is now stored in a dedicated struct and built up using methods of that struct.

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>
This commit is contained in:
Ophestra Umiker 2024-09-17 13:48:42 +09:00
parent 6a6f62efa6
commit 4b7d616862
Signed by: cat
SSH Key Fingerprint: SHA256:6kgHEIjF2pWUE8e8JwjVV1IvwgjV6z9J3+ksLiloDfQ
21 changed files with 346 additions and 287 deletions
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4
flag.go
View File

@ -3,7 +3,7 @@ package main
import (
"flag"
"git.ophivana.moe/cat/fortify/internal/util"
"git.ophivana.moe/cat/fortify/internal"
)
var (
@ -44,7 +44,7 @@ func init() {
func init() {
methodHelpString := "Method of launching the child process, can be one of \"sudo\", \"bubblewrap\""
if util.SdBootedV {
if internal.SdBootedV {
methodHelpString += ", \"systemd\""
}

23
internal/app/dbus.go
View File

@ -9,8 +9,7 @@ import (
"git.ophivana.moe/cat/fortify/acl"
"git.ophivana.moe/cat/fortify/dbus"
"git.ophivana.moe/cat/fortify/internal/final"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal"
"git.ophivana.moe/cat/fortify/internal/util"
"git.ophivana.moe/cat/fortify/internal/verbose"
)
@ -26,7 +25,7 @@ var (
)
func (a *App) ShareDBus(dse, dsg *dbus.Config, log bool) {
a.setEnablement(state.EnableDBus)
a.setEnablement(internal.EnableDBus)
dbusSystem = dsg != nil
var binPath string
@ -41,7 +40,7 @@ func (a *App) ShareDBus(dse, dsg *dbus.Config, log bool) {
}
if b, ok := util.Which("xdg-dbus-proxy"); !ok {
final.Fatal("D-Bus: Did not find 'xdg-dbus-proxy' in PATH")
internal.Fatal("D-Bus: Did not find 'xdg-dbus-proxy' in PATH")
} else {
binPath = b
}
@ -69,7 +68,7 @@ func (a *App) ShareDBus(dse, dsg *dbus.Config, log bool) {
verbose.Println("D-Bus: sealing system proxy", dsg.Args(systemBus))
}
if err := p.Seal(dse, dsg); err != nil {
final.Fatal("D-Bus: invalid config when sealing proxy,", err)
internal.Fatal("D-Bus: invalid config when sealing proxy,", err)
}
ready := make(chan bool, 1)
@ -80,7 +79,7 @@ func (a *App) ShareDBus(dse, dsg *dbus.Config, log bool) {
verbose.Printf("Starting system bus proxy '%s' for address '%s'\n", dbusAddress[1], systemBus[0])
}
if err := p.Start(&ready); err != nil {
final.Fatal("D-Bus: error starting proxy,", err)
internal.Fatal("D-Bus: error starting proxy,", err)
}
verbose.Println("D-Bus proxy launch:", p)
@ -97,24 +96,24 @@ func (a *App) ShareDBus(dse, dsg *dbus.Config, log bool) {
}()
// register early to enable Fatal cleanup
final.RegisterDBus(p, &done)
a.exit.SealDBus(p, &done)
if !<-ready {
final.Fatal("D-Bus: proxy did not start correctly")
internal.Fatal("D-Bus: proxy did not start correctly")
}
a.AppendEnv(dbusSessionBusAddress, dbusAddress[0])
if err := acl.UpdatePerm(sessionBus[1], a.UID(), acl.Read, acl.Write); err != nil {
final.Fatal(fmt.Sprintf("Error preparing D-Bus session proxy '%s':", dbusAddress[0]), err)
internal.Fatal(fmt.Sprintf("Error preparing D-Bus session proxy '%s':", dbusAddress[0]), err)
} else {
final.RegisterRevertPath(sessionBus[1])
a.exit.RegisterRevertPath(sessionBus[1])
}
if dsg != nil {
a.AppendEnv(dbusSystemBusAddress, dbusAddress[1])
if err := acl.UpdatePerm(systemBus[1], a.UID(), acl.Read, acl.Write); err != nil {
final.Fatal(fmt.Sprintf("Error preparing D-Bus system proxy '%s':", dbusAddress[1]), err)
internal.Fatal(fmt.Sprintf("Error preparing D-Bus system proxy '%s':", dbusAddress[1]), err)
} else {
final.RegisterRevertPath(systemBus[1])
a.exit.RegisterRevertPath(systemBus[1])
}
}
verbose.Printf("Session bus proxy '%s' for address '%s' configured\n", dbusAddress[0], sessionBus[0])

22
internal/app/ensure.go
View File

@ -8,29 +8,29 @@ import (
"path"
"git.ophivana.moe/cat/fortify/acl"
"git.ophivana.moe/cat/fortify/internal/final"
"git.ophivana.moe/cat/fortify/internal"
"git.ophivana.moe/cat/fortify/internal/verbose"
)
func (a *App) EnsureRunDir() {
if err := os.Mkdir(a.runDirPath, 0700); err != nil && !errors.Is(err, fs.ErrExist) {
final.Fatal("Error creating runtime directory:", err)
internal.Fatal("Error creating runtime directory:", err)
}
}
func (a *App) EnsureRuntime() {
if s, err := os.Stat(a.runtimePath); err != nil {
if errors.Is(err, fs.ErrNotExist) {
final.Fatal("Runtime directory does not exist")
internal.Fatal("Runtime directory does not exist")
}
final.Fatal("Error accessing runtime directory:", err)
internal.Fatal("Error accessing runtime directory:", err)
} else if !s.IsDir() {
final.Fatal(fmt.Sprintf("Path '%s' is not a directory", a.runtimePath))
internal.Fatal(fmt.Sprintf("Path '%s' is not a directory", a.runtimePath))
} else {
if err = acl.UpdatePerm(a.runtimePath, a.UID(), acl.Execute); err != nil {
final.Fatal("Error preparing runtime directory:", err)
internal.Fatal("Error preparing runtime directory:", err)
} else {
final.RegisterRevertPath(a.runtimePath)
a.exit.RegisterRevertPath(a.runtimePath)
}
verbose.Printf("Runtime data dir '%s' configured\n", a.runtimePath)
}
@ -39,7 +39,7 @@ func (a *App) EnsureRuntime() {
func (a *App) EnsureShare() {
// acl is unnecessary as this directory is world executable
if err := os.Mkdir(a.sharePath, 0701); err != nil && !errors.Is(err, fs.ErrExist) {
final.Fatal("Error creating shared directory:", err)
internal.Fatal("Error creating shared directory:", err)
}
// workaround for launch method sudo
@ -47,12 +47,12 @@ func (a *App) EnsureShare() {
// ensure child runtime directory (e.g. `/tmp/fortify.%d/%d.share`)
cr := path.Join(a.sharePath, a.Uid+".share")
if err := os.Mkdir(cr, 0700); err != nil && !errors.Is(err, fs.ErrExist) {
final.Fatal("Error creating child runtime directory:", err)
internal.Fatal("Error creating child runtime directory:", err)
} else {
if err = acl.UpdatePerm(cr, a.UID(), acl.Read, acl.Write, acl.Execute); err != nil {
final.Fatal("Error preparing child runtime directory:", err)
internal.Fatal("Error preparing child runtime directory:", err)
} else {
final.RegisterRevertPath(cr)
a.exit.RegisterRevertPath(cr)
}
a.AppendEnv("XDG_RUNTIME_DIR", cr)
a.AppendEnv("XDG_SESSION_CLASS", "user")

4
internal/app/launch.go
View File

@ -5,11 +5,11 @@ import (
"encoding/base64"
"encoding/gob"
"fmt"
"git.ophivana.moe/cat/fortify/internal/final"
"os"
"strings"
"syscall"
"git.ophivana.moe/cat/fortify/internal"
"git.ophivana.moe/cat/fortify/internal/util"
)
@ -20,7 +20,7 @@ func (a *App) launcherPayloadEnv() string {
enc := base64.NewEncoder(base64.StdEncoding, r)
if err := gob.NewEncoder(enc).Encode(a.command); err != nil {
final.Fatal("Error encoding launcher payload:", err)
internal.Fatal("Error encoding launcher payload:", err)
}
_ = enc.Close()

76
internal/app/pulse.go
View File

@ -8,58 +8,102 @@ import (
"path"
"git.ophivana.moe/cat/fortify/acl"
"git.ophivana.moe/cat/fortify/internal/final"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal"
"git.ophivana.moe/cat/fortify/internal/util"
"git.ophivana.moe/cat/fortify/internal/verbose"
)
const (
pulseServer = "PULSE_SERVER"
pulseCookie = "PULSE_COOKIE"
home = "HOME"
xdgConfigHome = "XDG_CONFIG_HOME"
)
func (a *App) SharePulse() {
a.setEnablement(state.EnablePulse)
a.setEnablement(internal.EnablePulse)
// ensure PulseAudio directory ACL (e.g. `/run/user/%d/pulse`)
pulse := path.Join(a.runtimePath, "pulse")
pulseS := path.Join(pulse, "native")
if s, err := os.Stat(pulse); err != nil {
if !errors.Is(err, fs.ErrNotExist) {
final.Fatal("Error accessing PulseAudio directory:", err)
internal.Fatal("Error accessing PulseAudio directory:", err)
}
final.Fatal(fmt.Sprintf("PulseAudio dir '%s' not found", pulse))
internal.Fatal(fmt.Sprintf("PulseAudio dir '%s' not found", pulse))
} else {
// add environment variable for new process
a.AppendEnv(util.PulseServer, "unix:"+pulseS)
a.AppendEnv(pulseServer, "unix:"+pulseS)
if err = acl.UpdatePerm(pulse, a.UID(), acl.Execute); err != nil {
final.Fatal("Error preparing PulseAudio:", err)
internal.Fatal("Error preparing PulseAudio:", err)
} else {
final.RegisterRevertPath(pulse)
a.exit.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) {
final.Fatal("PulseAudio directory found but socket does not exist")
internal.Fatal("PulseAudio directory found but socket does not exist")
}
final.Fatal("Error accessing PulseAudio socket:", err)
internal.Fatal("Error accessing PulseAudio socket:", err)
} else {
if m := s.Mode(); m&0o006 != 0o006 {
final.Fatal(fmt.Sprintf("Unexpected permissions on '%s':", pulseS), m)
internal.Fatal(fmt.Sprintf("Unexpected permissions on '%s':", pulseS), m)
}
}
// Publish current user's pulse-cookie for target user
pulseCookieSource := util.DiscoverPulseCookie()
pulseCookieSource := discoverPulseCookie()
pulseCookieFinal := path.Join(a.sharePath, "pulse-cookie")
a.AppendEnv(util.PulseCookie, pulseCookieFinal)
a.AppendEnv(pulseCookie, pulseCookieFinal)
verbose.Printf("Publishing PulseAudio cookie '%s' to '%s'\n", pulseCookieSource, pulseCookieFinal)
if err = util.CopyFile(pulseCookieFinal, pulseCookieSource); err != nil {
final.Fatal("Error copying PulseAudio cookie:", err)
internal.Fatal("Error copying PulseAudio cookie:", err)
}
if err = acl.UpdatePerm(pulseCookieFinal, a.UID(), acl.Read); err != nil {
final.Fatal("Error publishing PulseAudio cookie:", err)
internal.Fatal("Error publishing PulseAudio cookie:", err)
} else {
final.RegisterRevertPath(pulseCookieFinal)
a.exit.RegisterRevertPath(pulseCookieFinal)
}
verbose.Printf("PulseAudio dir '%s' configured\n", pulse)
}
}
// discoverPulseCookie try various standard methods to discover the current user's PulseAudio authentication cookie
func discoverPulseCookie() string {
if p, ok := os.LookupEnv(pulseCookie); ok {
return p
}
if p, ok := os.LookupEnv(home); ok {
p = path.Join(p, ".pulse-cookie")
if s, err := os.Stat(p); err != nil {
if !errors.Is(err, fs.ErrNotExist) {
internal.Fatal("Error accessing PulseAudio cookie:", err)
// unreachable
return p
}
} else if !s.IsDir() {
return p
}
}
if p, ok := os.LookupEnv(xdgConfigHome); ok {
p = path.Join(p, "pulse", "cookie")
if s, err := os.Stat(p); err != nil {
if !errors.Is(err, fs.ErrNotExist) {
internal.Fatal("Error accessing PulseAudio cookie:", err)
// unreachable
return p
}
} else if !s.IsDir() {
return p
}
}
internal.Fatal(fmt.Sprintf("Cannot locate PulseAudio cookie (tried $%s, $%s/pulse/cookie, $%s/.pulse-cookie)",
pulseCookie, xdgConfigHome, home))
return ""
}

20
internal/app/run.go
View File

@ -3,11 +3,11 @@ package app
import (
"errors"
"fmt"
"git.ophivana.moe/cat/fortify/internal/final"
"os"
"os/exec"
"strings"
"git.ophivana.moe/cat/fortify/internal"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal/util"
"git.ophivana.moe/cat/fortify/internal/verbose"
@ -52,28 +52,28 @@ func (a *App) Run() {
verbose.Println("Executing:", cmd)
if err := cmd.Start(); err != nil {
final.Fatal("Error starting process:", err)
internal.Fatal("Error starting process:", err)
}
final.RegisterEnablement(a.enablements)
a.exit.SealEnablements(a.enablements)
if statePath, err := state.SaveProcess(a.Uid, cmd, a.runDirPath, a.command, a.enablements); err != nil {
// process already started, shouldn't be fatal
fmt.Println("Error registering process:", err)
} else {
final.RegisterStatePath(statePath)
a.exit.SealStatePath(statePath)
}
var r int
if err := cmd.Wait(); err != nil {
var exitError *exec.ExitError
if !errors.As(err, &exitError) {
final.Fatal("Error running process:", err)
internal.Fatal("Error running process:", err)
}
}
verbose.Println("Process exited with exit code", r)
final.BeforeExit()
internal.BeforeExit()
os.Exit(r)
}
@ -101,7 +101,7 @@ func (a *App) commandBuilderSudo() (args []string) {
func (a *App) commandBuilderBwrap() (args []string) {
// TODO: build bwrap command
final.Fatal("bwrap")
internal.Fatal("bwrap")
panic("unreachable")
}
@ -129,7 +129,7 @@ func (a *App) commandBuilderMachineCtl() (args []string) {
// /bin/sh -c
if sh, ok := util.Which("sh"); !ok {
final.Fatal("Did not find 'sh' in PATH")
internal.Fatal("Did not find 'sh' in PATH")
} else {
args = append(args, sh, "-c")
}
@ -147,9 +147,9 @@ func (a *App) commandBuilderMachineCtl() (args []string) {
innerCommand.WriteString("; ")
if executable, err := os.Executable(); err != nil {
final.Fatal("Error reading executable path:", err)
internal.Fatal("Error reading executable path:", err)
} else {
if a.enablements.Has(state.EnableDBus) {
if a.enablements.Has(internal.EnableDBus) {
innerCommand.WriteString(dbusSessionBusAddress + "=" + "'" + dbusAddress[0] + "' ")
if dbusSystem {
innerCommand.WriteString(dbusSystemBusAddress + "=" + "'" + dbusAddress[1] + "' ")

19
internal/app/setup.go
View File

@ -8,7 +8,7 @@ import (
"path"
"strconv"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal"
"git.ophivana.moe/cat/fortify/internal/util"
"git.ophivana.moe/cat/fortify/internal/verbose"
)
@ -22,6 +22,8 @@ type App struct {
env []string // modified via AppendEnv
command []string // set on initialisation
exit *internal.ExitState // assigned
launchOptionText string // set on initialisation
launchOption uint8 // assigned
@ -30,7 +32,7 @@ type App struct {
runDirPath string // assigned
toolPath string // assigned
enablements state.Enablements // set via setEnablement
enablements internal.Enablements // set via setEnablement
*user.User // assigned
// absolutely *no* method of this type is thread-safe
@ -45,7 +47,7 @@ func (a *App) RunDir() string {
return a.runDirPath
}
func (a *App) setEnablement(e state.Enablement) {
func (a *App) setEnablement(e internal.Enablement) {
if a.enablements.Has(e) {
panic("enablement " + e.String() + " set twice")
}
@ -53,6 +55,13 @@ func (a *App) setEnablement(e state.Enablement) {
a.enablements |= e.Mask()
}
func (a *App) SealExit(exit *internal.ExitState) {
if a.exit != nil {
panic("application exit state sealed twice")
}
a.exit = exit
}
func New(userName string, args []string, launchOptionText string) *App {
a := &App{
command: args,
@ -96,7 +105,7 @@ func New(userName string, args []string, launchOptionText string) *App {
}
verbose.Println("Running as user", a.Username, "("+a.Uid+"),", "command:", a.command)
if util.SdBootedV {
if internal.SdBootedV {
verbose.Println("System booted with systemd as init system (PID 1).")
}
@ -120,7 +129,7 @@ func New(userName string, args []string, launchOptionText string) *App {
}
case "systemd":
a.launchOption = LaunchMethodMachineCtl
if !util.SdBootedV {
if !internal.SdBootedV {
fmt.Println("System has not been booted with systemd as init system (PID 1).")
os.Exit(1)
}

11
internal/app/wayland.go
View File

@ -6,8 +6,7 @@ import (
"path"
"git.ophivana.moe/cat/fortify/acl"
"git.ophivana.moe/cat/fortify/internal/final"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal"
"git.ophivana.moe/cat/fortify/internal/verbose"
)
@ -17,19 +16,19 @@ const (
)
func (a *App) ShareWayland() {
a.setEnablement(state.EnableWayland)
a.setEnablement(internal.EnableWayland)
// ensure Wayland socket ACL (e.g. `/run/user/%d/wayland-%d`)
if w, ok := os.LookupEnv(waylandDisplay); !ok {
final.Fatal("Wayland: WAYLAND_DISPLAY not set")
internal.Fatal("Wayland: WAYLAND_DISPLAY not set")
} else {
// add environment variable for new process
wp := path.Join(a.runtimePath, w)
a.AppendEnv(waylandDisplay, wp)
if err := acl.UpdatePerm(wp, a.UID(), acl.Read, acl.Write, acl.Execute); err != nil {
final.Fatal(fmt.Sprintf("Error preparing Wayland '%s':", w), err)
internal.Fatal(fmt.Sprintf("Error preparing Wayland '%s':", w), err)
} else {
final.RegisterRevertPath(wp)
a.exit.RegisterRevertPath(wp)
}
verbose.Printf("Wayland socket '%s' configured\n", w)
}

11
internal/app/x.go
View File

@ -4,8 +4,7 @@ import (
"fmt"
"os"
"git.ophivana.moe/cat/fortify/internal/final"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal"
"git.ophivana.moe/cat/fortify/internal/verbose"
"git.ophivana.moe/cat/fortify/xcb"
)
@ -13,20 +12,20 @@ import (
const display = "DISPLAY"
func (a *App) ShareX() {
a.setEnablement(state.EnableX)
a.setEnablement(internal.EnableX)
// discovery X11 and grant user permission via the `ChangeHosts` command
if d, ok := os.LookupEnv(display); !ok {
final.Fatal("X11: DISPLAY not set")
internal.Fatal("X11: DISPLAY not set")
} else {
// add environment variable for new process
a.AppendEnv(display, d)
verbose.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 {
final.Fatal(fmt.Sprintf("Error adding XHost entry to '%s':", d), err)
internal.Fatal(fmt.Sprintf("Error adding XHost entry to '%s':", d), err)
} else {
final.XcbActionComplete()
a.exit.XcbActionComplete()
}
}
}

16
internal/early.go Normal file
View File

@ -0,0 +1,16 @@
package internal
import (
"fmt"
"git.ophivana.moe/cat/fortify/internal/util"
)
var SdBootedV = func() bool {
if v, err := util.SdBooted(); err != nil {
fmt.Println("warn: read systemd marker:", err)
return false
} else {
return v
}
}()

6
internal/state/enablement.go → internal/enablement.go
View File

@ -1,4 +1,4 @@
package state
package internal
type (
Enablement uint8
@ -11,10 +11,10 @@ const (
EnableDBus
EnablePulse
enableLength
EnableLength
)
var enablementString = [enableLength]string{
var enablementString = [EnableLength]string{
"Wayland",
"X11",
"D-Bus",

176
internal/exit.go Normal file
View File

@ -0,0 +1,176 @@
package internal
import (
"errors"
"fmt"
"io/fs"
"os"
"os/user"
"git.ophivana.moe/cat/fortify/acl"
"git.ophivana.moe/cat/fortify/dbus"
"git.ophivana.moe/cat/fortify/internal/verbose"
"git.ophivana.moe/cat/fortify/xcb"
)
// ExitState keeps track of various changes fortify made to the system
// as well as other resources that need to be manually released.
// NOT thread safe.
type ExitState struct {
// target fortified user inherited from app.App
user *user.User
// integer UID of targeted user
uid int
// returns amount of launcher states read
launcherStateCount func() (int, error)
// paths to strip ACLs (of target user) from
aclCleanupCandidate []string
// target process capability enablements
enablements *Enablements
// whether the xcb.ChangeHosts action was complete
xcbActionComplete bool
// reference to D-Bus proxy instance, nil if disabled
dbusProxy *dbus.Proxy
// D-Bus wait complete notification
dbusDone *chan struct{}
// path to fortify process state information
statePath string
// prevents cleanup from happening twice
complete bool
}
// RegisterRevertPath registers a path with ACLs added by fortify
func (s *ExitState) RegisterRevertPath(p string) {
s.aclCleanupCandidate = append(s.aclCleanupCandidate, p)
}
// SealEnablements submits the child process enablements
func (s *ExitState) SealEnablements(e Enablements) {
if s.enablements != nil {
panic("enablement exit state set twice")
}
s.enablements = &e
}
// XcbActionComplete submits xcb.ChangeHosts action completion
func (s *ExitState) XcbActionComplete() {
if s.xcbActionComplete {
Fatal("xcb inserted twice")
}
s.xcbActionComplete = true
}
// SealDBus submits the child's D-Bus proxy instance
func (s *ExitState) SealDBus(p *dbus.Proxy, done *chan struct{}) {
if p == nil {
Fatal("unexpected nil dbus proxy exit state submitted")
}
if s.dbusProxy != nil {
Fatal("dbus proxy exit state set twice")
}
s.dbusProxy = p
s.dbusDone = done
}
// SealStatePath submits filesystem path to the fortify process's state file
func (s *ExitState) SealStatePath(v string) {
if s.statePath != "" {
panic("statePath set twice")
}
s.statePath = v
}
// NewExit initialises a new ExitState containing basic, unchanging information
// about the fortify process required during cleanup
func NewExit(u *user.User, uid int, f func() (int, error)) *ExitState {
return &ExitState{
uid: uid,
user: u,
launcherStateCount: f,
}
}
func Fatal(msg ...any) {
fmt.Println(msg...)
BeforeExit()
os.Exit(1)
}
var exitState *ExitState
func SealExit(s *ExitState) {
if exitState != nil {
panic("exit state submitted twice")
}
exitState = s
}
func BeforeExit() {
if exitState == nil {
fmt.Println("warn: cleanup attempted before exit state submission")
return
}
exitState.beforeExit()
}
func (s *ExitState) beforeExit() {
if s.complete {
panic("beforeExit called twice")
}
if s.statePath == "" {
verbose.Println("State path is unset")
} else {
if err := os.Remove(s.statePath); err != nil && !errors.Is(err, fs.ErrNotExist) {
fmt.Println("Error removing state file:", err)
}
}
if count, err := s.launcherStateCount(); err != nil {
fmt.Println("Error reading active launchers:", err)
os.Exit(1)
} else if count > 0 {
// other launchers are still active
verbose.Printf("Found %d active launchers, exiting without cleaning up\n", count)
return
}
verbose.Println("No other launchers active, will clean up")
if s.xcbActionComplete {
verbose.Printf("X11: Removing XHost entry SI:localuser:%s\n", s.user.Username)
if err := xcb.ChangeHosts(xcb.HostModeDelete, xcb.FamilyServerInterpreted, "localuser\x00"+s.user.Username); err != nil {
fmt.Println("Error removing XHost entry:", err)
}
}
for _, candidate := range s.aclCleanupCandidate {
if err := acl.UpdatePerm(candidate, s.uid); err != nil {
fmt.Printf("Error stripping ACL entry from '%s': %s\n", candidate, err)
}
verbose.Printf("Stripped ACL entry for user '%s' from '%s'\n", s.user.Username, candidate)
}
if s.dbusProxy != nil {
verbose.Println("D-Bus proxy registered, cleaning up")
if err := s.dbusProxy.Close(); err != nil {
if errors.Is(err, os.ErrClosed) {
verbose.Println("D-Bus proxy already closed")
} else {
fmt.Println("Error closing D-Bus proxy:", err)
}
}
// wait for Proxy.Wait to return
<-*s.dbusDone
}
}

74
internal/final/exit.go
View File

@ -1,74 +0,0 @@
package final
import (
"errors"
"fmt"
"io/fs"
"os"
"git.ophivana.moe/cat/fortify/acl"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal/verbose"
"git.ophivana.moe/cat/fortify/xcb"
)
func Fatal(msg ...any) {
fmt.Println(msg...)
BeforeExit()
os.Exit(1)
}
func BeforeExit() {
if u == nil {
fmt.Println("warn: beforeExit called before app init")
return
}
if statePath == "" {
verbose.Println("State path is unset")
} else {
if err := os.Remove(statePath); err != nil && !errors.Is(err, fs.ErrNotExist) {
fmt.Println("Error removing state file:", err)
}
}
if d, err := state.ReadLaunchers(runDirPath, u.Uid); err != nil {
fmt.Println("Error reading active launchers:", err)
os.Exit(1)
} else if len(d) > 0 {
// other launchers are still active
verbose.Printf("Found %d active launchers, exiting without cleaning up\n", len(d))
return
}
verbose.Println("No other launchers active, will clean up")
if xcbActionComplete {
verbose.Printf("X11: Removing XHost entry SI:localuser:%s\n", u.Username)
if err := xcb.ChangeHosts(xcb.HostModeDelete, xcb.FamilyServerInterpreted, "localuser\x00"+u.Username); err != nil {
fmt.Println("Error removing XHost entry:", err)
}
}
for _, candidate := range cleanupCandidate {
if err := acl.UpdatePerm(candidate, uid); err != nil {
fmt.Printf("Error stripping ACL entry from '%s': %s\n", candidate, err)
}
verbose.Printf("Stripped ACL entry for user '%s' from '%s'\n", u.Username, candidate)
}
if dbusProxy != nil {
verbose.Println("D-Bus proxy registered, cleaning up")
if err := dbusProxy.Close(); err != nil {
if errors.Is(err, os.ErrClosed) {
verbose.Println("D-Bus proxy already closed")
} else {
fmt.Println("Error closing D-Bus proxy:", err)
}
}
// wait for Proxy.Wait to return
<-*dbusDone
}
}

20
internal/final/prepare.go
View File

@ -1,20 +0,0 @@
package final
import "os/user"
var (
u *user.User
uid int
runDirPath string
)
func Prepare(val user.User, d int, s string) {
if u != nil {
panic("final prepared twice")
}
u = &val
uid = d
runDirPath = s
}

48
internal/final/register.go
View File

@ -1,48 +0,0 @@
package final
import (
"git.ophivana.moe/cat/fortify/dbus"
"git.ophivana.moe/cat/fortify/internal/state"
)
var (
cleanupCandidate []string
enablements *state.Enablements
xcbActionComplete bool
dbusProxy *dbus.Proxy
dbusDone *chan struct{}
statePath string
)
func RegisterRevertPath(p string) {
cleanupCandidate = append(cleanupCandidate, p)
}
func RegisterEnablement(e state.Enablements) {
if enablements != nil {
panic("enablement state set twice")
}
enablements = &e
}
func XcbActionComplete() {
if xcbActionComplete {
Fatal("xcb inserted twice")
}
xcbActionComplete = true
}
func RegisterDBus(p *dbus.Proxy, done *chan struct{}) {
dbusProxy = p
dbusDone = done
}
func RegisterStatePath(v string) {
if statePath != "" {
panic("statePath set twice")
}
statePath = v
}

12
internal/state/data.go
View File

@ -4,6 +4,8 @@ import (
"encoding/gob"
"os"
"path"
"git.ophivana.moe/cat/fortify/internal"
)
// we unfortunately have to assume there are never races between processes
@ -14,10 +16,12 @@ type launcherState struct {
Launcher string
Argv []string
Command []string
Capability Enablements
Capability internal.Enablements
}
func ReadLaunchers(runDirPath, uid string) ([]*launcherState, error) {
// ReadLaunchers reads all launcher state file entries for the requested user
// and if decode is true decodes these launchers as well.
func ReadLaunchers(runDirPath, uid string, decode bool) ([]*launcherState, error) {
var f *os.File
var r []*launcherState
launcherPrefix := path.Join(runDirPath, uid)
@ -39,7 +43,11 @@ func ReadLaunchers(runDirPath, uid string) ([]*launcherState, error) {
var s launcherState
r = append(r, &s)
if decode {
return gob.NewDecoder(f).Decode(&s)
} else {
return nil
}
}
}(); err != nil {
return nil, err

5
internal/state/print.go
View File

@ -7,6 +7,7 @@ import (
"strings"
"text/tabwriter"
"git.ophivana.moe/cat/fortify/internal"
"git.ophivana.moe/cat/fortify/internal/verbose"
)
@ -31,7 +32,7 @@ func MustPrintLauncherStateGlobal(w **tabwriter.Writer, runDirPath string) {
}
func MustPrintLauncherState(w **tabwriter.Writer, runDirPath, uid string) {
launchers, err := ReadLaunchers(runDirPath, uid)
launchers, err := ReadLaunchers(runDirPath, uid, true)
if err != nil {
fmt.Println("Error reading launchers:", err)
os.Exit(1)
@ -49,7 +50,7 @@ func MustPrintLauncherState(w **tabwriter.Writer, runDirPath, uid string) {
for _, state := range launchers {
enablementsDescription := strings.Builder{}
for i := Enablement(0); i < enableLength; i++ {
for i := internal.Enablement(0); i < internal.EnableLength; i++ {
if state.Capability.Has(i) {
enablementsDescription.WriteString(", " + i.String())
}

4
internal/state/track.go
View File

@ -8,10 +8,12 @@ import (
"os/exec"
"path"
"strconv"
"git.ophivana.moe/cat/fortify/internal"
)
// SaveProcess called after process start, before wait
func SaveProcess(uid string, cmd *exec.Cmd, runDirPath string, command []string, enablements Enablements) (string, error) {
func SaveProcess(uid string, cmd *exec.Cmd, runDirPath string, command []string, enablements internal.Enablements) (string, error) {
statePath := path.Join(runDirPath, uid, strconv.Itoa(cmd.Process.Pid))
state := launcherState{
PID: cmd.Process.Pid,

12
internal/util/early.go
View File

@ -1,12 +0,0 @@
package util
import "fmt"
var SdBootedV = func() bool {
if v, err := SdBooted(); err != nil {
fmt.Println("warn: read systemd marker:", err)
return false
} else {
return v
}
}()

46
internal/util/std.go
View File

@ -2,21 +2,12 @@ package util
import (
"errors"
"fmt"
"git.ophivana.moe/cat/fortify/internal/final"
"io/fs"
"os"
"path"
)
const (
systemdCheckPath = "/run/systemd/system"
home = "HOME"
xdgConfigHome = "XDG_CONFIG_HOME"
PulseServer = "PULSE_SERVER"
PulseCookie = "PULSE_COOKIE"
)
// SdBooted implements https://www.freedesktop.org/software/systemd/man/sd_booted.html
@ -31,40 +22,3 @@ func SdBooted() (bool, error) {
return true, nil
}
// DiscoverPulseCookie try various standard methods to discover the current user's PulseAudio authentication cookie
func DiscoverPulseCookie() string {
if p, ok := os.LookupEnv(PulseCookie); ok {
return p
}
if p, ok := os.LookupEnv(home); ok {
p = path.Join(p, ".pulse-cookie")
if s, err := os.Stat(p); err != nil {
if !errors.Is(err, fs.ErrNotExist) {
final.Fatal("Error accessing PulseAudio cookie:", err)
// unreachable
return p
}
} else if !s.IsDir() {
return p
}
}
if p, ok := os.LookupEnv(xdgConfigHome); ok {
p = path.Join(p, "pulse", "cookie")
if s, err := os.Stat(p); err != nil {
if !errors.Is(err, fs.ErrNotExist) {
final.Fatal("Error accessing PulseAudio cookie:", err)
// unreachable
return p
}
} else if !s.IsDir() {
return p
}
}
final.Fatal(fmt.Sprintf("Cannot locate PulseAudio cookie (tried $%s, $%s/pulse/cookie, $%s/.pulse-cookie)",
PulseCookie, xdgConfigHome, home))
return ""
}

20
main.go
View File

@ -10,10 +10,10 @@ import (
"strconv"
"syscall"
"git.ophivana.moe/cat/fortify/internal/final"
"git.ophivana.moe/cat/fortify/dbus"
"git.ophivana.moe/cat/fortify/internal"
"git.ophivana.moe/cat/fortify/internal/app"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal/verbose"
)
@ -21,6 +21,7 @@ var (
Version = "impure"
a *app.App
s *internal.ExitState
dbusSession *dbus.Config
dbusSystem *dbus.Config
@ -47,7 +48,12 @@ func main() {
tryLicense()
a = app.New(userName, flag.Args(), launchOptionText)
final.Prepare(*a.User, a.UID(), a.RunDir())
s = internal.NewExit(a.User, a.UID(), func() (int, error) {
d, err := state.ReadLaunchers(a.RunDir(), a.Uid, false)
return len(d), err
})
a.SealExit(s)
internal.SealExit(s)
// parse D-Bus config file if applicable
if mustDBus {
@ -55,10 +61,10 @@ func main() {
dbusSession = dbus.NewConfig(dbusID, true, mpris)
} else {
if f, err := os.Open(dbusConfigSession); err != nil {
final.Fatal("Error opening D-Bus proxy config file:", err)
internal.Fatal("Error opening D-Bus proxy config file:", err)
} else {
if err = json.NewDecoder(f).Decode(&dbusSession); err != nil {
final.Fatal("Error parsing D-Bus proxy config file:", err)
internal.Fatal("Error parsing D-Bus proxy config file:", err)
}
}
}
@ -66,10 +72,10 @@ func main() {
// system bus proxy is optional
if dbusConfigSystem != "nil" {
if f, err := os.Open(dbusConfigSystem); err != nil {
final.Fatal("Error opening D-Bus proxy config file:", err)
internal.Fatal("Error opening D-Bus proxy config file:", err)
} else {
if err = json.NewDecoder(f).Decode(&dbusSystem); err != nil {
final.Fatal("Error parsing D-Bus proxy config file:", err)
internal.Fatal("Error parsing D-Bus proxy config file:", err)
}
}
}