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package helper
import (
"context"
"errors"
"io"
"os"
"os/exec"
"slices"
"strconv"
"sync"
"syscall"
"git.gensokyo.uk/security/fortify/helper/bwrap"
"git.gensokyo.uk/security/fortify/helper/proc"
)
// BubblewrapName is the file name or path to bubblewrap.
var BubblewrapName = "bwrap"
type bubblewrap struct {
// final args fd of bwrap process
argsFd uintptr
// name of the command to run in bwrap
name string
lock sync.RWMutex
*helperCmd
}
func (b *bubblewrap) Start() error {
b.lock.Lock()
defer b.lock.Unlock()
// Check for doubled Start calls before we defer failure cleanup. If the prior
// call to Start succeeded, we don't want to spuriously close its pipes.
if b.Cmd != nil && b.Cmd.Process != nil {
return errors.New("exec: already started")
}
args := b.finalise()
b.Cmd.Args = slices.Grow(b.Cmd.Args, 4+len(args))
b.Cmd.Args = append(b.Cmd.Args, "--args", strconv.Itoa(int(b.argsFd)), "--", b.name)
b.Cmd.Args = append(b.Cmd.Args, args...)
return proc.Fulfill(b.ctx, &b.ExtraFiles, b.Cmd.Start, b.files, b.extraFiles)
}
// MustNewBwrap initialises a new Bwrap instance with wt as the null-terminated argument writer.
// If wt is nil, the child process spawned by bwrap will not get an argument pipe.
// Function argF returns an array of arguments passed directly to the child process.
func MustNewBwrap(
ctx context.Context,
name string,
wt io.WriterTo,
stat bool,
argF func(argsFd, statFd int) []string,
cmdF func(cmd *exec.Cmd),
conf *bwrap.Config,
setpgid bool,
extraFiles []*os.File,
syncFd *os.File,
) Helper {
b, err := NewBwrap(ctx, name, wt, stat, argF, cmdF, conf, setpgid, extraFiles, syncFd)
if err != nil {
panic(err.Error())
} else {
return b
}
}
// NewBwrap initialises a new Bwrap instance with wt as the null-terminated argument writer.
// If wt is nil, the child process spawned by bwrap will not get an argument pipe.
// Function argF returns an array of arguments passed directly to the child process.
func NewBwrap(
ctx context.Context,
name string,
wt io.WriterTo,
stat bool,
argF func(argsFd, statFd int) []string,
cmdF func(cmd *exec.Cmd),
conf *bwrap.Config,
setpgid bool,
extraFiles []*os.File,
syncFd *os.File,
) (Helper, error) {
b := new(bubblewrap)
b.name = name
b.helperCmd = newHelperCmd(ctx, BubblewrapName, wt, argF, stat, extraFiles)
if setpgid {
b.Cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
}
if cmdF != nil {
cmdF(b.helperCmd.Cmd)
}
if v, err := NewCheckedArgs(conf.Args(syncFd, b.extraFiles, &b.files)); err != nil {
return nil, err
} else {
f := proc.NewWriterTo(v)
b.argsFd = proc.InitFile(f, b.extraFiles)
b.files = append(b.files, f)
}
return b, nil
}
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