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|
package main
import (
"fmt"
"log"
"os"
"strings"
"syscall"
"github.com/landlock-lsm/go-landlock/landlock"
)
func parseFlags(args []string) (verbose bool, cfg landlock.Config, opts []landlock.Rule, cmd []string) {
cfg = landlock.V5
takeArgs := func(makeOpt func(...string) landlock.FSRule) landlock.Rule {
var paths []string
needRefer := false
needIoctlDev := false
for len(args) > 0 && !strings.HasPrefix(args[0], "-") {
switch args[0] {
case "+refer":
needRefer = true
case "+ioctl_dev":
needIoctlDev = true
default:
paths = append(paths, args[0])
}
args = args[1:]
}
opt := makeOpt(paths...)
if verbose {
fmt.Println("Path option:", opt)
}
if needRefer {
opt = opt.WithRefer()
}
if needIoctlDev {
opt = opt.WithIoctlDev()
}
if verbose {
fmt.Println("Path option:", opt)
}
return opt
}
bestEffort := true
ArgParsing:
for len(args) > 0 {
switch args[0] {
case "-5":
cfg = landlock.V5
args = args[1:]
continue
case "-4":
cfg = landlock.V4
args = args[1:]
continue
case "-3":
cfg = landlock.V3
args = args[1:]
continue
case "-2":
cfg = landlock.V2
args = args[1:]
continue
case "-1":
cfg = landlock.V1
args = args[1:]
continue
case "-strict":
bestEffort = false
args = args[1:]
continue
case "-v":
verbose = true
args = args[1:]
continue
case "-ro":
args = args[1:]
opts = append(opts, takeArgs(landlock.RODirs))
continue
case "-rw":
args = args[1:]
opts = append(opts, takeArgs(landlock.RWDirs))
continue
case "-rofiles":
args = args[1:]
opts = append(opts, takeArgs(landlock.ROFiles))
continue
case "-rwfiles":
args = args[1:]
opts = append(opts, takeArgs(landlock.RWFiles))
continue
case "--":
args = args[1:]
// Remaining args are the command
break ArgParsing
default:
log.Fatalf("Unrecognized option %q", args[0])
}
}
cmd = args
if bestEffort {
cfg = cfg.BestEffort()
}
return verbose, cfg, opts, cmd
}
func main() {
verbose, cfg, opts, cmdArgs := parseFlags(os.Args[1:])
if verbose {
fmt.Println("Args: ", os.Args)
fmt.Println()
fmt.Printf("Config: %v\n", cfg)
fmt.Println()
fmt.Printf("Executing command %v\n", cmdArgs)
}
if len(cmdArgs) < 1 {
fmt.Println("Usage:")
fmt.Println(" landlock-restrict")
fmt.Println(" [-v]")
fmt.Println(" [-1] [-2] [-3] [-4] [-5] [-strict]")
fmt.Println(" [-ro [+refer] PATH...] [-rw [+refer] [+ioctl_dev] PATH...]")
fmt.Println(" [-rofiles [+refer] PATH] [-rwfiles [+refer] PATH]")
fmt.Println(" -- COMMAND...")
fmt.Println()
fmt.Println("Options:")
fmt.Println(" -ro, -rw, -rofiles, -rwfiles paths to restrict to")
fmt.Println(" -1, -2, -3, -4, -5 select Landlock version")
fmt.Println(" -strict use strict mode (instead of best effort)")
fmt.Println(" -v verbose logging")
fmt.Println()
fmt.Println("A path list that contains the word '+refer' will additionally grant the refer access right.")
fmt.Println()
fmt.Println("Default mode for Landlock is V5 in best effort mode (best compatibility)")
fmt.Println()
log.Fatalf("Need proper command, got %v", cmdArgs)
}
if !strings.HasPrefix(cmdArgs[0], "/") {
log.Fatalf("Need absolute binary path, got %q", cmdArgs[0])
}
err := cfg.RestrictPaths(opts...)
if err != nil {
log.Fatalf("landlock: %v", err)
}
if err := syscall.Exec(cmdArgs[0], cmdArgs, os.Environ()); err != nil {
log.Fatalf("execve: %v", err)
}
}
|
