security
/
fortify
2
1
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases 14 Wiki Activity

rename to fortify and restructure 

More sandbox features will be added and this will no longer track ego's features and behaviour.

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>
This commit is contained in:
Ophestra Umiker 2024-09-04 01:20:12 +09:00
parent 7e6eb82195
commit d8f76f3b25
Signed by: cat
SSH Key Fingerprint: SHA256:gQ67O0enBZ7UdZypgtspB2FDM1g3GVw8nX0XSdcFw8Q
24 changed files with 830 additions and 749 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
.gitignore vendored
View File

@ -4,7 +4,7 @@
*.dll *.dll
*.so *.so
*.dylib *.dylib
/ego /fortify
# Test binary, built with `go test -c` # Test binary, built with `go test -c`
*.test *.test

83
README.md
View File

@ -1,83 +0,0 @@
ego (the Go side)
=================
[![Go Reference](https://pkg.go.dev/badge/git.ophivana.moe/cat/ego.svg)](https://pkg.go.dev/git.ophivana.moe/cat/ego)
> Do all your games need access to your documents, browser history, SSH private keys?
>
> ... No? Just run `ego steam`!
**Ego** is a tool to run Linux desktop applications under a different local user. Currently
integrates with Wayland, Xorg, PulseAudio and xdg-desktop-portal. You may think of it as `xhost`
for Wayland and PulseAudio. This is done using filesystem ACLs and X11 host access control.
Disclaimer: **DO NOT RUN UNTRUSTED PROGRAMS VIA EGO.** However, using ego is more secure than
running applications directly under your primary user.
Differences
-----------
* Written in Go
* Tracks process states
* Cleans up after last process exits
* Argv preservation in machinectl mode
* Has no dependencies other than the two C libraries
Manual setup
------------
Ego aims to come with sane defaults and be easy to set up.
**Requirements:**
* Sudo
* A C compiler
* [Go](https://go.dev/doc/install)
* `libacl.so` library (Debian/Ubuntu: libacl1-dev; Fedora: libacl-devel; Arch: acl)
* `libxcb.so` library (Debian/Ubuntu: libxcb1-dev; Fedora: libxcb-devel; Arch: libxcb)
**Recommended:** (Not needed when using `--sudo` mode, but some desktop functionality may not work).
* `machinectl` command (Debian/Ubuntu/Fedora: systemd-container; Arch: systemd)
* `xdg-desktop-portal-gtk` (Debian/Ubuntu/Fedora/Arch: xdg-desktop-portal-gtk)
**Installation:**
1. Run in repository worktree:
go build -v -ldflags '-s -w'
sudo cp ego /usr/local/bin/
2. Create local user named "ego": <sup>[1]</sup>
sudo useradd ego --uid 155 --create-home
3. That's all, try it:
ego xdg-open .
[1] No extra groups are needed by the ego user.
UID below 1000 hides this user on the login screen.
### Avoid password prompt
If using "machinectl" mode (default if available), you need the rather new systemd version >=247
and polkit >=0.106 to do this securely.
Create file `/etc/polkit-1/rules.d/50-ego-machinectl.rules`, polkit will automatically load it
(replace `$USER` with your own username):
```js
polkit.addRule(function(action, subject) {
if (action.id == "org.freedesktop.machine1.host-shell" &&
action.lookup("user") == "ego" &&
subject.user == "$USER") {
return polkit.Result.YES;
}
});
```
##### sudo mode
For sudo, add the following to `/etc/sudoers` (replace `$USER` with your own username):
$USER ALL=(ego) NOPASSWD:ALL
Appendix
--------
Ego is licensed under the MIT License (see the `LICENSE` file).
The original Ego was created by Marti Raudsepp under the repository https://github.com/intgr/ego

41
cli.go
View File

@ -1,50 +1,23 @@
package main package main
import ( import (
"errors"
"flag" "flag"
"fmt"
"os" "git.ophivana.moe/cat/fortify/internal/system"
"os/user"
) )
var ( var (
userName string userName string
methodFlags [2]bool
printVersion bool printVersion bool
mustPulse bool mustPulse bool
flagVerbose bool
) )
func init() { func init() {
flag.StringVar(&userName, "u", "ego", "Specify a username") flag.StringVar(&userName, "u", "chronos", "Specify a username")
flag.BoolVar(&methodFlags[0], "sudo", false, "Use 'sudo' to change user") flag.BoolVar(&system.MethodFlags[0], "sudo", false, "Use 'sudo' to change user")
flag.BoolVar(&methodFlags[1], "bare", false, "Use 'machinectl' but skip xdg-desktop-portal setup") 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(&mustPulse, "pulse", false, "Treat unavailable PulseAudio as fatal")
flag.BoolVar(&verbose, "v", false, "Verbose output") flag.BoolVar(&flagVerbose, "v", false, "Verbose output")
flag.BoolVar(&printVersion, "V", false, "Print version") flag.BoolVar(&printVersion, "V", false, "Print version")
} }
func copyArgs() {
tryLauncher()
tryVersion()
tryLicense()
command = flag.Args()
if u, err := user.Lookup(userName); err != nil {
if errors.As(err, new(user.UnknownUserError)) {
fmt.Println("unknown user", userName)
} else {
// unreachable
panic(err)
}
os.Exit(1)
} else {
ego = u
}
if verbose {
fmt.Println("Running as user", ego.Username, "("+ego.Uid+"),", "command:", command)
}
}

6
flake.nix
View File

@ -1,5 +1,5 @@
{ {
description = "ego development environment"; description = "fortify development environment";
inputs = { inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/24.05"; nixpkgs.url = "github:NixOS/nixpkgs/24.05";
@ -30,11 +30,11 @@
mkShell { mkShell {
packages = [ packages = [
(buildGoModule rec { (buildGoModule rec {
pname = "ego"; pname = "fortify";
version = "0.0.0-flake"; version = "0.0.0-flake";
src = ./.; src = ./.;
vendorHash = null; # we have no dependencies :3 vendorHash = null; # we have no Go dependencies :3
ldflags = [ ldflags = [
"-s" "-s"

2
go.mod
View File

@ -1,3 +1,3 @@
module git.ophivana.moe/cat/ego module git.ophivana.moe/cat/fortify
go 1.22 go 1.22

79
acl.go → internal/acl/c.go
View File

@ -1,4 +1,4 @@
package main package acl
import ( import (
"errors" "errors"
@ -13,88 +13,11 @@ import (
//#cgo linux LDFLAGS: -lacl //#cgo linux LDFLAGS: -lacl
import "C" import "C"
const (
aclRead = C.ACL_READ
aclWrite = C.ACL_WRITE
aclExecute = C.ACL_EXECUTE
aclTypeDefault = C.ACL_TYPE_DEFAULT
aclTypeAccess = C.ACL_TYPE_ACCESS
aclUndefinedTag = C.ACL_UNDEFINED_TAG
aclUserObj = C.ACL_USER_OBJ
aclUser = C.ACL_USER
aclGroupObj = C.ACL_GROUP_OBJ
aclGroup = C.ACL_GROUP
aclMask = C.ACL_MASK
aclOther = C.ACL_OTHER
)
type acl struct { type acl struct {
val C.acl_t val C.acl_t
freed bool freed bool
} }
func aclUpdatePerm(path string, uid int, perms ...C.acl_perm_t) error {
// read acl from file
a, err := aclGetFile(path, aclTypeAccess)
if err != nil {
return err
}
// free acl on return if get is successful
defer a.free()
// remove existing entry
if err = a.removeEntry(aclUser, uid); err != nil {
return err
}
// create new entry if perms are passed
if len(perms) > 0 {
// create new acl entry
var e C.acl_entry_t
if _, err = C.acl_create_entry(&a.val, &e); err != nil {
return err
}
// get perm set of new entry
var p C.acl_permset_t
if _, err = C.acl_get_permset(e, &p); err != nil {
return err
}
// add target perms
for _, perm := range perms {
if _, err = C.acl_add_perm(p, perm); err != nil {
return err
}
}
// set perm set to new entry
if _, err = C.acl_set_permset(e, p); err != nil {
return err
}
// set user tag to new entry
if _, err = C.acl_set_tag_type(e, aclUser); err != nil {
return err
}
// set qualifier (uid) to new entry
if _, err = C.acl_set_qualifier(e, unsafe.Pointer(&uid)); err != nil {
return err
}
}
// calculate mask after update
if _, err = C.acl_calc_mask(&a.val); err != nil {
return err
}
// write acl to file
return a.setFile(path, aclTypeAccess)
}
func aclGetFile(path string, t C.acl_type_t) (*acl, error) { func aclGetFile(path string, t C.acl_type_t) (*acl, error) {
p := C.CString(path) p := C.CString(path)
a, err := C.acl_get_file(p, t) a, err := C.acl_get_file(p, t)

86
internal/acl/export.go Normal file
View File

@ -0,0 +1,86 @@
package acl
import "unsafe"
//#include <stdlib.h>
//#include <sys/acl.h>
//#include <acl/libacl.h>
//#cgo linux LDFLAGS: -lacl
import "C"
const (
Read = C.ACL_READ
Write = C.ACL_WRITE
Execute = C.ACL_EXECUTE
TypeDefault = C.ACL_TYPE_DEFAULT
TypeAccess = C.ACL_TYPE_ACCESS
UndefinedTag = C.ACL_UNDEFINED_TAG
UserObj = C.ACL_USER_OBJ
User = C.ACL_USER
GroupObj = C.ACL_GROUP_OBJ
Group = C.ACL_GROUP
Mask = C.ACL_MASK
Other = C.ACL_OTHER
)
func UpdatePerm(path string, uid int, perms ...C.acl_perm_t) error {
// read acl from file
a, err := aclGetFile(path, TypeAccess)
if err != nil {
return err
}
// free acl on return if get is successful
defer a.free()
// remove existing entry
if err = a.removeEntry(User, uid); err != nil {
return err
}
// create new entry if perms are passed
if len(perms) > 0 {
// create new acl entry
var e C.acl_entry_t
if _, err = C.acl_create_entry(&a.val, &e); err != nil {
return err
}
// get perm set of new entry
var p C.acl_permset_t
if _, err = C.acl_get_permset(e, &p); err != nil {
return err
}
// add target perms
for _, perm := range perms {
if _, err = C.acl_add_perm(p, perm); err != nil {
return err
}
}
// set perm set to new entry
if _, err = C.acl_set_permset(e, p); err != nil {
return err
}
// set user tag to new entry
if _, err = C.acl_set_tag_type(e, User); err != nil {
return err
}
// set qualifier (uid) to new entry
if _, err = C.acl_set_qualifier(e, unsafe.Pointer(&uid)); err != nil {
return err
}
}
// calculate mask after update
if _, err = C.acl_calc_mask(&a.val); err != nil {
return err
}
// write acl to file
return a.setFile(path, TypeAccess)
}

13
internal/app/builder.go Normal file
View File

@ -0,0 +1,13 @@
package app
func (a *App) Command() []string {
return a.command
}
func (a *App) UID() int {
return a.uid
}
func (a *App) AppendEnv(k, v string) {
a.env = append(a.env, k+"="+v)
}

152
internal/app/launch.go Normal file
View File

@ -0,0 +1,152 @@
package app
import (
"bytes"
"encoding/base64"
"encoding/gob"
"fmt"
"os"
"strings"
"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"
)
func (a *App) launcherPayloadEnv() string {
r := &bytes.Buffer{}
enc := base64.NewEncoder(base64.StdEncoding, r)
if err := gob.NewEncoder(enc).Encode(a.command); err != nil {
state.Fatal("Error encoding launcher payload:", err)
}
_ = enc.Close()
return launcherPayload + "=" + r.String()
}
// Early hidden launcher path
func Early(printVersion bool) {
if printVersion {
if r, ok := os.LookupEnv(launcherPayload); ok {
dec := base64.NewDecoder(base64.StdEncoding, strings.NewReader(r))
var argv []string
if err := gob.NewDecoder(dec).Decode(&argv); err != nil {
fmt.Println("Error decoding launcher payload:", err)
os.Exit(1)
}
if err := os.Unsetenv(launcherPayload); err != nil {
fmt.Println("Error unsetting launcher payload:", err)
// not fatal, do not fail
}
var p string
if len(argv) > 0 {
if p, ok = util.Which(argv[0]); !ok {
fmt.Printf("Did not find '%s' in PATH\n", argv[0])
os.Exit(1)
}
} else {
if p, ok = os.LookupEnv("SHELL"); !ok {
fmt.Println("No command was specified and $SHELL was unset")
os.Exit(1)
}
}
if err := syscall.Exec(p, argv, os.Environ()); err != nil {
fmt.Println("Error executing launcher payload:", err)
os.Exit(1)
}
// unreachable
os.Exit(1)
return
}
}
}
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
}

124
internal/app/setup.go Normal file
View File

@ -0,0 +1,124 @@
package app
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 {
uid int
env []string
command []string
*user.User
}
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
}
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)
}
func New(userName string, args []string) *App {
a := &App{command: args}
if u, err := user.Lookup(userName); err != nil {
if errors.As(err, new(user.UnknownUserError)) {
fmt.Println("unknown user", userName)
} else {
// unreachable
panic(err)
}
// too early for fatal
os.Exit(1)
} else {
a.User = u
}
if u, err := strconv.Atoi(a.Uid); err != nil {
// usually unreachable
panic("uid parse")
} else {
a.uid = u
}
if system.V.Verbose {
fmt.Println("Running as user", a.Username, "("+a.Uid+"),", "command:", a.command)
}
return a
}

68
internal/state/exit.go Normal file
View File

@ -0,0 +1,68 @@
package state
import (
"errors"
"fmt"
"io/fs"
"os"
"git.ophivana.moe/cat/fortify/internal/acl"
"git.ophivana.moe/cat/fortify/internal/system"
"git.ophivana.moe/cat/fortify/internal/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 == "" {
if system.V.Verbose {
fmt.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 := readLaunchers(); err != nil {
fmt.Println("Error reading active launchers:", err)
os.Exit(1)
} else if len(d) > 0 {
// other launchers are still active
if system.V.Verbose {
fmt.Printf("Found %d active launchers, exiting without cleaning up\n", len(d))
}
return
}
if system.V.Verbose {
fmt.Println("No other launchers active, will clean up")
}
if xcbActionComplete {
if system.V.Verbose {
fmt.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)
}
if system.V.Verbose {
fmt.Printf("Stripped ACL entry for user '%s' from '%s'\n", u.Username, candidate)
}
}
}

12
internal/state/register.go Normal file
View File

@ -0,0 +1,12 @@
package state
func RegisterRevertPath(p string) {
cleanupCandidate = append(cleanupCandidate, p)
}
func XcbActionComplete() {
if xcbActionComplete {
Fatal("xcb inserted twice")
}
xcbActionComplete = true
}

65
state.go → internal/state/track.go
View File

@ -1,4 +1,4 @@
package main package state
import ( import (
"encoding/gob" "encoding/gob"
@ -10,6 +10,8 @@ import (
"os/exec" "os/exec"
"path" "path"
"strconv" "strconv"
"git.ophivana.moe/cat/fortify/internal/system"
) )
// we unfortunately have to assume there are never races between processes // we unfortunately have to assume there are never races between processes
@ -33,7 +35,7 @@ func init() {
flag.BoolVar(&stateActionEarly, "state", false, "query state value of current active launchers") flag.BoolVar(&stateActionEarly, "state", false, "query state value of current active launchers")
} }
func tryState() { func Early() {
if !stateActionEarly { if !stateActionEarly {
return return
} }
@ -52,13 +54,9 @@ func tryState() {
os.Exit(0) os.Exit(0)
} }
func registerRevertPath(p string) { // SaveProcess called after process start, before wait
cleanupCandidate = append(cleanupCandidate, p) func SaveProcess(uid string, cmd *exec.Cmd) error {
} statePath = path.Join(system.V.RunDir, uid, strconv.Itoa(cmd.Process.Pid))
// called after process start, before wait
func registerProcess(uid string, cmd *exec.Cmd) error {
statePath = path.Join(runDir, uid, strconv.Itoa(cmd.Process.Pid))
state := launcherState{ state := launcherState{
PID: cmd.Process.Pid, PID: cmd.Process.Pid,
Launcher: cmd.Path, Launcher: cmd.Path,
@ -66,7 +64,7 @@ func registerProcess(uid string, cmd *exec.Cmd) error {
Command: command, Command: command,
} }
if err := os.Mkdir(path.Join(runDir, uid), 0700); err != nil && !errors.Is(err, fs.ErrExist) { if err := os.Mkdir(path.Join(system.V.RunDir, uid), 0700); err != nil && !errors.Is(err, fs.ErrExist) {
return err return err
} }
@ -86,7 +84,7 @@ func registerProcess(uid string, cmd *exec.Cmd) error {
func readLaunchers() ([]*launcherState, error) { func readLaunchers() ([]*launcherState, error) {
var f *os.File var f *os.File
var r []*launcherState var r []*launcherState
launcherPrefix := path.Join(runDir, ego.Uid) launcherPrefix := path.Join(system.V.RunDir, u.Uid)
if pl, err := os.ReadDir(launcherPrefix); err != nil { if pl, err := os.ReadDir(launcherPrefix); err != nil {
return nil, err return nil, err
@ -115,48 +113,3 @@ func readLaunchers() ([]*launcherState, error) {
return r, nil return r, nil
} }
func beforeExit() {
if err := os.Remove(statePath); err != nil && !errors.Is(err, fs.ErrNotExist) {
fmt.Println("Error removing state file:", err)
}
if a, err := readLaunchers(); err != nil {
fmt.Println("Error reading active launchers:", err)
os.Exit(1)
} else if len(a) > 0 {
// other launchers are still active
if verbose {
fmt.Printf("Found %d active launchers, exiting without cleaning up\n", len(a))
}
return
}
if verbose {
fmt.Println("No other launchers active, will clean up")
}
if xcbActionComplete {
if verbose {
fmt.Printf("X11: Removing XHost entry SI:localuser:%s\n", ego.Username)
}
if err := changeHosts(xcbHostModeDelete, xcbFamilyServerInterpreted, "localuser\x00"+ego.Username); err != nil {
fmt.Println("Error removing XHost entry:", err)
}
}
for _, candidate := range cleanupCandidate {
if err := aclUpdatePerm(candidate, uid); err != nil {
fmt.Printf("Error stripping ACL entry from '%s': %s\n", candidate, err)
}
if verbose {
fmt.Printf("Stripped ACL entry for user '%s' from '%s'\n", ego.Username, candidate)
}
}
}
func fatal(msg ...any) {
fmt.Println(msg...)
beforeExit()
os.Exit(1)
}

21
internal/state/value.go Normal file
View File

@ -0,0 +1,21 @@
package state
import (
"os/user"
)
var (
u *user.User
uid int
command []string
)
func Set(val user.User, c []string, d int) {
if u != nil {
panic("state set twice")
}
u = &val
command = c
uid = d
}

28
internal/system/retrieve.go Normal file
View File

@ -0,0 +1,28 @@
package system
import (
"fmt"
"os"
"path"
"strconv"
)
func Retrieve(verbose bool) {
if V != nil {
panic("system info retrieved twice")
}
v := &Values{Share: path.Join(os.TempDir(), "fortify."+strconv.Itoa(os.Geteuid())), Verbose: verbose}
if r, ok := os.LookupEnv(xdgRuntimeDir); !ok {
fmt.Println("Env variable", xdgRuntimeDir, "unset")
// too early for fatal
os.Exit(1)
} else {
v.Runtime = r
v.RunDir = path.Join(v.Runtime, "fortify")
}
V = v
}

17
internal/system/value.go Normal file
View File

@ -0,0 +1,17 @@
package system
const (
xdgRuntimeDir = "XDG_RUNTIME_DIR"
)
type Values struct {
Share string
Runtime string
RunDir string
Verbose bool
}
var (
V *Values
MethodFlags [2]bool
)

39
internal/util/simple.go Normal file
View File

@ -0,0 +1,39 @@
package util
import (
"io"
"os"
"os/exec"
)
func Which(file string) (string, bool) {
p, err := exec.LookPath(file)
return p, err == nil
}
func CopyFile(dst, src string) error {
srcD, err := os.Open(src)
if err != nil {
return err
}
defer func() {
if srcD.Close() != nil {
// unreachable
panic("src file closed prematurely")
}
}()
dstD, err := os.OpenFile(dst, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
defer func() {
if dstD.Close() != nil {
// unreachable
panic("dst file closed prematurely")
}
}()
_, err = io.Copy(dstD, srcD)
return err
}

75
internal/util/std.go Normal file
View File

@ -0,0 +1,75 @@
package util
import (
"errors"
"fmt"
"io/fs"
"os"
"path"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal/system"
)
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
func SdBooted() bool {
_, err := os.Stat(systemdCheckPath)
if err != nil {
if system.V.Verbose {
if errors.Is(err, fs.ErrNotExist) {
fmt.Println("System not booted through systemd")
} else {
fmt.Println("Error accessing", systemdCheckPath+":", err.Error())
}
}
return false
}
return true
}
// 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) {
state.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) {
state.Fatal("Error accessing PulseAudio cookie:", err)
// unreachable
return p
}
} else if !s.IsDir() {
return p
}
}
state.Fatal(fmt.Sprintf("Cannot locate PulseAudio cookie (tried $%s, $%s/pulse/cookie, $%s/.pulse-cookie)",
PulseCookie, xdgConfigHome, home))
return ""
}

33
internal/xcb/c.go Normal file
View File

@ -0,0 +1,33 @@
package xcb
import (
"errors"
)
//#include <stdlib.h>
//#include <xcb/xcb.h>
//#cgo linux LDFLAGS: -lxcb
import "C"
func xcbHandleConnectionError(c *C.xcb_connection_t) error {
if errno := C.xcb_connection_has_error(c); errno != 0 {
switch errno {
case C.XCB_CONN_ERROR:
return errors.New("connection error")
case C.XCB_CONN_CLOSED_EXT_NOTSUPPORTED:
return errors.New("extension not supported")
case C.XCB_CONN_CLOSED_MEM_INSUFFICIENT:
return errors.New("memory not available")
case C.XCB_CONN_CLOSED_REQ_LEN_EXCEED:
return errors.New("request length exceeded")
case C.XCB_CONN_CLOSED_PARSE_ERR:
return errors.New("invalid display string")
case C.XCB_CONN_CLOSED_INVALID_SCREEN:
return errors.New("server has no screen matching display")
default:
return errors.New("generic X11 failure")
}
} else {
return nil
}
}

47
internal/xcb/export.go Normal file
View File

@ -0,0 +1,47 @@
package xcb
//#include <stdlib.h>
//#include <xcb/xcb.h>
//#cgo linux LDFLAGS: -lxcb
import "C"
import (
"errors"
"unsafe"
)
const (
HostModeInsert = C.XCB_HOST_MODE_INSERT
HostModeDelete = C.XCB_HOST_MODE_DELETE
FamilyInternet = C.XCB_FAMILY_INTERNET
FamilyDecnet = C.XCB_FAMILY_DECNET
FamilyChaos = C.XCB_FAMILY_CHAOS
FamilyServerInterpreted = C.XCB_FAMILY_SERVER_INTERPRETED
FamilyInternet6 = C.XCB_FAMILY_INTERNET_6
)
func ChangeHosts(mode, family C.uint8_t, address string) error {
var c *C.xcb_connection_t
c = C.xcb_connect(nil, nil)
defer C.xcb_disconnect(c)
if err := xcbHandleConnectionError(c); err != nil {
return err
}
addr := C.CString(address)
cookie := C.xcb_change_hosts_checked(c, mode, family, C.ushort(len(address)), (*C.uchar)(unsafe.Pointer(addr)))
C.free(unsafe.Pointer(addr))
if err := xcbHandleConnectionError(c); err != nil {
return err
}
e := C.xcb_request_check(c, cookie)
if e != nil {
defer C.free(unsafe.Pointer(e))
return errors.New("xcb_change_hosts() failed")
}
return nil
}

72
launcher.go
View File

@ -1,72 +0,0 @@
package main
import (
"bytes"
"encoding/base64"
"encoding/gob"
"fmt"
"os"
"strings"
"syscall"
)
const (
// hidden path for main to act as a launcher
egoLauncher = "EGO_LAUNCHER"
)
// hidden launcher path
func tryLauncher() {
if printVersion {
if r, ok := os.LookupEnv(egoLauncher); ok {
// egoLauncher variable contains launcher payload
dec := base64.NewDecoder(base64.StdEncoding, strings.NewReader(r))
var argv []string
if err := gob.NewDecoder(dec).Decode(&argv); err != nil {
fmt.Println("Error decoding launcher payload:", err)
os.Exit(1)
}
if err := os.Unsetenv(egoLauncher); err != nil {
fmt.Println("Error unsetting launcher payload:", err)
// not fatal, do not fail
}
var p string
if len(argv) > 0 {
if p, ok = which(argv[0]); !ok {
fmt.Printf("Did not find '%s' in PATH\n", argv[0])
os.Exit(1)
}
} else {
if p, ok = os.LookupEnv("SHELL"); !ok {
fmt.Println("No command was specified and $SHELL was unset")
os.Exit(1)
}
}
if err := syscall.Exec(p, argv, os.Environ()); err != nil {
fmt.Println("Error executing launcher payload:", err)
os.Exit(1)
}
// unreachable
os.Exit(1)
return
}
}
}
func launcherPayloadEnv() string {
r := &bytes.Buffer{}
enc := base64.NewEncoder(base64.StdEncoding, r)
if err := gob.NewEncoder(enc).Encode(command); err != nil {
fatal("Error encoding launcher payload:", err)
}
_ = enc.Close()
return egoLauncher + "=" + r.String()
}

342
main.go
View File

@ -6,15 +6,22 @@ import (
"fmt" "fmt"
"io/fs" "io/fs"
"os" "os"
"os/exec"
"os/user"
"path" "path"
"strconv" "strconv"
"strings"
"syscall" "syscall"
"git.ophivana.moe/cat/fortify/internal/acl"
"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 Version = "impure" var (
Version = "impure"
a *app.App
)
func tryVersion() { func tryVersion() {
if printVersion { if printVersion {
@ -23,25 +30,9 @@ func tryVersion() {
} }
} }
var (
ego *user.User
uid int
env []string
command []string
verbose bool
runtime string
runDir string
)
const ( const (
term = "TERM" term = "TERM"
home = "HOME" display = "DISPLAY"
sudoAskPass = "SUDO_ASKPASS"
xdgRuntimeDir = "XDG_RUNTIME_DIR"
xdgConfigHome = "XDG_CONFIG_HOME"
display = "DISPLAY"
pulseServer = "PULSE_SERVER"
pulseCookie = "PULSE_COOKIE"
// https://manpages.debian.org/experimental/libwayland-doc/wl_display_connect.3.en.html // https://manpages.debian.org/experimental/libwayland-doc/wl_display_connect.3.en.html
waylandDisplay = "WAYLAND_DISPLAY" waylandDisplay = "WAYLAND_DISPLAY"
@ -49,315 +40,168 @@ const (
func main() { func main() {
flag.Parse() flag.Parse()
copyArgs()
if u, err := strconv.Atoi(ego.Uid); err != nil { // launcher payload early exit
// usually unreachable app.Early(printVersion)
panic("ego uid parse")
} else { // version/license command early exit
uid = u tryVersion()
tryLicense()
system.Retrieve(flagVerbose)
a = app.New(userName, flag.Args())
state.Set(*a.User, a.Command(), a.UID())
// ensure RunDir (e.g. `/run/user/%d/fortify`)
if err := os.Mkdir(system.V.RunDir, 0700); err != nil && !errors.Is(err, fs.ErrExist) {
state.Fatal("Error creating runtime directory:", err)
} }
if r, ok := os.LookupEnv(xdgRuntimeDir); !ok { // state query command early exit
fatal("Env variable", xdgRuntimeDir, "unset") state.Early()
} else {
runtime = r // ensure Share (e.g. `/tmp/fortify.%d`)
runDir = path.Join(runtime, "ego") // acl is unnecessary as this directory is world executable
if err := os.Mkdir(system.V.Share, 0701); err != nil && !errors.Is(err, fs.ErrExist) {
state.Fatal("Error creating shared directory:", err)
} }
// state query command // warn about target user home directory ownership
tryState() if stat, err := os.Stat(a.HomeDir); err != nil {
if system.V.Verbose {
// Report warning if user home directory does not exist or has wrong ownership
if stat, err := os.Stat(ego.HomeDir); err != nil {
if verbose {
switch { switch {
case errors.Is(err, fs.ErrPermission): case errors.Is(err, fs.ErrPermission):
fmt.Printf("User %s home directory %s is not accessible", ego.Username, ego.HomeDir) fmt.Printf("User %s home directory %s is not accessible", a.Username, a.HomeDir)
case errors.Is(err, fs.ErrNotExist): case errors.Is(err, fs.ErrNotExist):
fmt.Printf("User %s home directory %s does not exist", ego.Username, ego.HomeDir) fmt.Printf("User %s home directory %s does not exist", a.Username, a.HomeDir)
default: default:
fmt.Printf("Error stat user %s home directory %s: %s", ego.Username, ego.HomeDir, err) fmt.Printf("Error stat user %s home directory %s: %s", a.Username, a.HomeDir, err)
} }
} }
return return
} else { } else {
// FreeBSD: not cross-platform // FreeBSD: not cross-platform
if u := strconv.Itoa(int(stat.Sys().(*syscall.Stat_t).Uid)); u != ego.Uid { if u := strconv.Itoa(int(stat.Sys().(*syscall.Stat_t).Uid)); u != a.Uid {
fmt.Printf("User %s home directory %s has incorrect ownership (expected UID %s, found %s)", ego.Username, ego.HomeDir, ego.Uid, u) fmt.Printf("User %s home directory %s has incorrect ownership (expected UID %s, found %s)", a.Username, a.HomeDir, a.Uid, u)
} }
} }
// Add execute perm to runtime dir, e.g. `/run/user/%d` // ensure runtime directory ACL (e.g. `/run/user/%d`)
if s, err := os.Stat(runtime); err != nil { if s, err := os.Stat(system.V.Runtime); err != nil {
if errors.Is(err, fs.ErrNotExist) { if errors.Is(err, fs.ErrNotExist) {
fatal("Runtime directory does not exist") state.Fatal("Runtime directory does not exist")
} }
fatal("Error accessing runtime directory:", err) state.Fatal("Error accessing runtime directory:", err)
} else if !s.IsDir() { } else if !s.IsDir() {
fatal(fmt.Sprintf("Path '%s' is not a directory", runtime)) state.Fatal(fmt.Sprintf("Path '%s' is not a directory", system.V.Runtime))
} else { } else {
if err = aclUpdatePerm(runtime, uid, aclExecute); err != nil { if err = acl.UpdatePerm(system.V.Runtime, a.UID(), acl.Execute); err != nil {
fatal("Error preparing runtime dir:", err) state.Fatal("Error preparing runtime dir:", err)
} else { } else {
registerRevertPath(runtime) state.RegisterRevertPath(system.V.Runtime)
} }
if verbose { if system.V.Verbose {
fmt.Printf("Runtime data dir '%s' configured\n", runtime) fmt.Printf("Runtime data dir '%s' configured\n", system.V.Runtime)
} }
} }
// Create runtime dir for Ego itself (e.g. `/run/user/%d/ego`) and make it readable for target // ensure Wayland socket ACL (e.g. `/run/user/%d/wayland-%d`)
if err := os.Mkdir(runDir, 0700); err != nil && !errors.Is(err, fs.ErrExist) {
fatal("Error creating Ego runtime dir:", err)
}
if err := aclUpdatePerm(runDir, uid, aclExecute); err != nil {
fatal("Error preparing Ego runtime dir:", err)
} else {
registerRevertPath(runDir)
}
// Add rwx permissions to Wayland socket (e.g. `/run/user/%d/wayland-0`)
if w, ok := os.LookupEnv(waylandDisplay); !ok { if w, ok := os.LookupEnv(waylandDisplay); !ok {
if verbose { if system.V.Verbose {
fmt.Println("Wayland: WAYLAND_DISPLAY not set, skipping") fmt.Println("Wayland: WAYLAND_DISPLAY not set, skipping")
} }
} else { } else {
// add environment variable for new process // add environment variable for new process
env = append(env, waylandDisplay+"="+path.Join(runtime, w)) wp := path.Join(system.V.Runtime, w)
wp := path.Join(runtime, w) a.AppendEnv(waylandDisplay, wp)
if err := aclUpdatePerm(wp, uid, aclRead, aclWrite, aclExecute); err != nil { if err := acl.UpdatePerm(wp, a.UID(), acl.Read, acl.Write, acl.Execute); err != nil {
fatal(fmt.Sprintf("Error preparing Wayland '%s':", w), err) state.Fatal(fmt.Sprintf("Error preparing Wayland '%s':", w), err)
} else { } else {
registerRevertPath(wp) state.RegisterRevertPath(wp)
} }
if verbose { if system.V.Verbose {
fmt.Printf("Wayland socket '%s' configured\n", w) fmt.Printf("Wayland socket '%s' configured\n", w)
} }
} }
// Detect `DISPLAY` and grant permissions via X11 protocol `ChangeHosts` command // discovery X11 and grant user permission via the `ChangeHosts` command
if d, ok := os.LookupEnv(display); !ok { if d, ok := os.LookupEnv(display); !ok {
if verbose { if system.V.Verbose {
fmt.Println("X11: DISPLAY not set, skipping") fmt.Println("X11: DISPLAY not set, skipping")
} }
} else { } else {
// add environment variable for new process // add environment variable for new process
env = append(env, display+"="+d) a.AppendEnv(display, d)
if verbose { if system.V.Verbose {
fmt.Printf("X11: Adding XHost entry SI:localuser:%s to display '%s'\n", ego.Username, d) fmt.Printf("X11: Adding XHost entry SI:localuser:%s to display '%s'\n", a.Username, d)
} }
if err := changeHosts(xcbHostModeInsert, xcbFamilyServerInterpreted, "localuser\x00"+ego.Username); err != nil { if err := xcb.ChangeHosts(xcb.HostModeInsert, xcb.FamilyServerInterpreted, "localuser\x00"+a.Username); err != nil {
fatal(fmt.Sprintf("Error adding XHost entry to '%s':", d), err) state.Fatal(fmt.Sprintf("Error adding XHost entry to '%s':", d), err)
} else { } else {
xcbActionComplete = true state.XcbActionComplete()
} }
} }
// Add execute permissions to PulseAudio directory (e.g. `/run/user/%d/pulse`) // ensure PulseAudio directory ACL (e.g. `/run/user/%d/pulse`)
pulse := path.Join(runtime, "pulse") pulse := path.Join(system.V.Runtime, "pulse")
pulseS := path.Join(pulse, "native") pulseS := path.Join(pulse, "native")
if s, err := os.Stat(pulse); err != nil { if s, err := os.Stat(pulse); err != nil {
if !errors.Is(err, fs.ErrNotExist) { if !errors.Is(err, fs.ErrNotExist) {
fatal("Error accessing PulseAudio directory:", err) state.Fatal("Error accessing PulseAudio directory:", err)
} }
if mustPulse { if mustPulse {
fatal("PulseAudio is unavailable") state.Fatal("PulseAudio is unavailable")
} }
if verbose { if system.V.Verbose {
fmt.Printf("PulseAudio dir '%s' not found, skipping\n", pulse) fmt.Printf("PulseAudio dir '%s' not found, skipping\n", pulse)
} }
} else { } else {
// add environment variable for new process // add environment variable for new process
env = append(env, pulseServer+"=unix:"+pulseS) a.AppendEnv(util.PulseServer, "unix:"+pulseS)
if err = aclUpdatePerm(pulse, uid, aclExecute); err != nil { if err = acl.UpdatePerm(pulse, a.UID(), acl.Execute); err != nil {
fatal("Error preparing PulseAudio:", err) state.Fatal("Error preparing PulseAudio:", err)
} else { } else {
registerRevertPath(pulse) state.RegisterRevertPath(pulse)
} }
// Ensure permissions of PulseAudio socket `/run/user/%d/pulse/native` // ensure PulseAudio socket permission (e.g. `/run/user/%d/pulse/native`)
if s, err = os.Stat(pulseS); err != nil { if s, err = os.Stat(pulseS); err != nil {
if errors.Is(err, fs.ErrNotExist) { if errors.Is(err, fs.ErrNotExist) {
fatal("PulseAudio directory found but socket does not exist") state.Fatal("PulseAudio directory found but socket does not exist")
} }
fatal("Error accessing PulseAudio socket:", err) state.Fatal("Error accessing PulseAudio socket:", err)
} else { } else {
if m := s.Mode(); m&0o006 != 0o006 { if m := s.Mode(); m&0o006 != 0o006 {
fatal(fmt.Sprintf("Unexpected permissions on '%s':", pulseS), m) state.Fatal(fmt.Sprintf("Unexpected permissions on '%s':", pulseS), m)
} }
} }
// Publish current user's pulse-cookie for target user // Publish current user's pulse-cookie for target user
pulseCookieSource := discoverPulseCookie() pulseCookieSource := util.DiscoverPulseCookie()
env = append(env, pulseCookie+"="+pulseCookieSource) pulseCookieFinal := path.Join(system.V.Share, "pulse-cookie")
pulseCookieFinal := path.Join(runDir, "pulse-cookie") a.AppendEnv(util.PulseCookie, pulseCookieFinal)
if verbose { if system.V.Verbose {
fmt.Printf("Publishing PulseAudio cookie '%s' to '%s'\n", pulseCookieSource, pulseCookieFinal) fmt.Printf("Publishing PulseAudio cookie '%s' to '%s'\n", pulseCookieSource, pulseCookieFinal)
} }
if err = copyFile(pulseCookieFinal, pulseCookieSource); err != nil { if err = util.CopyFile(pulseCookieFinal, pulseCookieSource); err != nil {
fatal("Error copying PulseAudio cookie:", err) state.Fatal("Error copying PulseAudio cookie:", err)
} }
if err = aclUpdatePerm(pulseCookieFinal, uid, aclRead); err != nil { if err = acl.UpdatePerm(pulseCookieFinal, a.UID(), acl.Read); err != nil {
fatal("Error publishing PulseAudio cookie:", err) state.Fatal("Error publishing PulseAudio cookie:", err)
} else { } else {
registerRevertPath(pulseCookieFinal) state.RegisterRevertPath(pulseCookieFinal)
} }
if verbose { if system.V.Verbose {
fmt.Printf("PulseAudio dir '%s' configured\n", pulse) fmt.Printf("PulseAudio dir '%s' configured\n", pulse)
} }
} }
// pass $TERM to launcher // pass $TERM to launcher
if t, ok := os.LookupEnv(term); ok { if t, ok := os.LookupEnv(term); ok {
env = append(env, term+"="+t) a.AppendEnv(term, t)
} }
f := launchBySudo a.Run()
m, b := false, false
switch {
case methodFlags[0]: // sudo
case methodFlags[1]: // bare
m, b = true, true
default: // machinectl
m, b = true, false
}
var toolPath string
// dependency checks
const sudoFallback = "Falling back to 'sudo', some desktop integration features may not work"
if m {
if !sdBooted() {
fmt.Println("This system was not booted through systemd")
fmt.Println(sudoFallback)
} else if tp, ok := which("machinectl"); !ok {
fmt.Println("Did not find 'machinectl' in PATH")
fmt.Println(sudoFallback)
} else {
toolPath = tp
f = func() []string { return launchByMachineCtl(b) }
}
} else if tp, ok := which("sudo"); !ok {
fatal("Did not find 'sudo' in PATH")
} else {
toolPath = tp
}
if verbose {
fmt.Printf("Selected launcher '%s' bare=%t\n", toolPath, b)
}
cmd := exec.Command(toolPath, f()...)
cmd.Env = env
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Dir = runDir
if verbose {
fmt.Println("Executing:", cmd)
}
if err := cmd.Start(); err != nil {
fatal("Error starting process:", err)
}
if err := registerProcess(ego.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) {
fatal("Error running process:", err)
}
}
if verbose {
fmt.Println("Process exited with exit code", r)
}
beforeExit()
os.Exit(r)
}
func launchBySudo() (args []string) {
args = make([]string, 0, 4+len(env)+len(command))
// -Hiu $USER
args = append(args, "-Hiu", ego.Username)
// -A?
if _, ok := os.LookupEnv(sudoAskPass); ok {
if verbose {
fmt.Printf("%s set, adding askpass flag\n", sudoAskPass)
}
args = append(args, "-A")
}
// environ
args = append(args, env...)
// -- $@
args = append(args, "--")
args = append(args, command...)
return
}
func launchByMachineCtl(bare bool) (args []string) {
args = make([]string, 0, 9+len(env))
// shell --uid=$USER
args = append(args, "shell", "--uid="+ego.Username)
// --quiet
if !verbose {
args = append(args, "--quiet")
}
// environ
envQ := make([]string, len(env)+1)
for i, e := range env {
envQ[i] = "-E" + e
}
envQ[len(env)] = "-E" + launcherPayloadEnv()
args = append(args, envQ...)
// -- .host
args = append(args, "--", ".host")
// /bin/sh -c
if sh, ok := which("sh"); !ok {
fatal("Did not find 'sh' in PATH")
} else {
args = append(args, sh, "-c")
}
if len(command) == 0 { // execute shell if command is not provided
command = []string{"$SHELL"}
}
innerCommand := strings.Builder{}
if !bare {
innerCommand.WriteString("dbus-update-activation-environment --systemd")
for _, e := range env {
innerCommand.WriteString(" " + strings.SplitN(e, "=", 2)[0])
}
innerCommand.WriteString("; systemctl --user start xdg-desktop-portal-gtk; ")
}
if executable, err := os.Executable(); err != nil {
fatal("Error reading executable path:", err)
} else {
innerCommand.WriteString("exec " + executable + " -V")
}
args = append(args, innerCommand.String())
return
} }

100
util.go
View File

@ -1,100 +0,0 @@
package main
import (
"errors"
"fmt"
"io"
"io/fs"
"os"
"os/exec"
"path"
)
const (
systemdCheckPath = "/run/systemd/system"
)
// https://www.freedesktop.org/software/systemd/man/sd_booted.html
func sdBooted() bool {
_, err := os.Stat(systemdCheckPath)
if err != nil {
if verbose {
if errors.Is(err, fs.ErrNotExist) {
fmt.Println("System not booted through systemd")
} else {
fmt.Println("Error accessing", systemdCheckPath+":", err.Error())
}
}
return false
}
return true
}
// Try various ways 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) {
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) {
fatal("Error accessing PulseAudio cookie:", err)
// unreachable
return p
}
} else if !s.IsDir() {
return p
}
}
fatal(fmt.Sprintf("Cannot locate PulseAudio cookie (tried $%s, $%s/pulse/cookie, $%s/.pulse-cookie)",
pulseCookie, xdgConfigHome, home))
return ""
}
func which(file string) (string, bool) {
p, err := exec.LookPath(file)
return p, err == nil
}
func copyFile(dst, src string) error {
srcD, err := os.Open(src)
if err != nil {
return err
}
defer func() {
if srcD.Close() != nil {
// unreachable
panic("src file closed prematurely")
}
}()
dstD, err := os.OpenFile(dst, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
defer func() {
if dstD.Close() != nil {
// unreachable
panic("dst file closed prematurely")
}
}()
_, err = io.Copy(dstD, srcD)
return err
}

72
x11.go
View File

@ -1,72 +0,0 @@
package main
import "C"
import (
"errors"
"unsafe"
)
//#include <stdlib.h>
//#include <xcb/xcb.h>
//#cgo linux LDFLAGS: -lxcb
import "C"
const (
xcbHostModeInsert = C.XCB_HOST_MODE_INSERT
xcbHostModeDelete = C.XCB_HOST_MODE_DELETE
xcbFamilyInternet = C.XCB_FAMILY_INTERNET
xcbFamilyDecnet = C.XCB_FAMILY_DECNET
xcbFamilyChaos = C.XCB_FAMILY_CHAOS
xcbFamilyServerInterpreted = C.XCB_FAMILY_SERVER_INTERPRETED
xcbFamilyInternet6 = C.XCB_FAMILY_INTERNET_6
)
func changeHosts(mode, family C.uint8_t, address string) error {
var c *C.xcb_connection_t
c = C.xcb_connect(nil, nil)
defer C.xcb_disconnect(c)
if err := xcbHandleConnectionError(c); err != nil {
return err
}
addr := C.CString(address)
cookie := C.xcb_change_hosts_checked(c, mode, family, C.ushort(len(address)), (*C.uchar)(unsafe.Pointer(addr)))
C.free(unsafe.Pointer(addr))
if err := xcbHandleConnectionError(c); err != nil {
return err
}
e := C.xcb_request_check(c, cookie)
if e != nil {
defer C.free(unsafe.Pointer(e))
return errors.New("xcb_change_hosts() failed")
}
return nil
}
func xcbHandleConnectionError(c *C.xcb_connection_t) error {
if errno := C.xcb_connection_has_error(c); errno != 0 {
switch errno {
case C.XCB_CONN_ERROR:
return errors.New("connection error")
case C.XCB_CONN_CLOSED_EXT_NOTSUPPORTED:
return errors.New("extension not supported")
case C.XCB_CONN_CLOSED_MEM_INSUFFICIENT:
return errors.New("memory not available")
case C.XCB_CONN_CLOSED_REQ_LEN_EXCEED:
return errors.New("request length exceeded")
case C.XCB_CONN_CLOSED_PARSE_ERR:
return errors.New("invalid display string")
case C.XCB_CONN_CLOSED_INVALID_SCREEN:
return errors.New("server has no screen matching display")
default:
return errors.New("generic X11 failure")
}
} else {
return nil
}
}