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|
package bwrap
import (
"encoding/gob"
"fmt"
"io"
"os"
"strconv"
"git.gensokyo.uk/security/fortify/helper/proc"
)
func init() {
gob.Register(new(PermConfig[SymlinkConfig]))
gob.Register(new(PermConfig[*TmpfsConfig]))
gob.Register(new(OverlayConfig))
gob.Register(new(DataConfig))
}
type PositionalArg int
func (p PositionalArg) String() string { return positionalArgs[p] }
const (
Tmpfs PositionalArg = iota
Symlink
Bind
BindTry
DevBind
DevBindTry
ROBind
ROBindTry
Chmod
Dir
RemountRO
Procfs
DevTmpfs
Mqueue
Perms
Size
OverlaySrc
Overlay
TmpOverlay
ROOverlay
SyncFd
Seccomp
File
BindData
ROBindData
)
var positionalArgs = [...]string{
Tmpfs: "--tmpfs",
Symlink: "--symlink",
Bind: "--bind",
BindTry: "--bind-try",
DevBind: "--dev-bind",
DevBindTry: "--dev-bind-try",
ROBind: "--ro-bind",
ROBindTry: "--ro-bind-try",
Chmod: "--chmod",
Dir: "--dir",
RemountRO: "--remount-ro",
Procfs: "--proc",
DevTmpfs: "--dev",
Mqueue: "--mqueue",
Perms: "--perms",
Size: "--size",
OverlaySrc: "--overlay-src",
Overlay: "--overlay",
TmpOverlay: "--tmp-overlay",
ROOverlay: "--ro-overlay",
SyncFd: "--sync-fd",
Seccomp: "--seccomp",
File: "--file",
BindData: "--bind-data",
ROBindData: "--ro-bind-data",
}
type PermConfig[T FSBuilder] struct {
// set permissions of next argument
// (--perms OCTAL)
Mode *os.FileMode `json:"mode,omitempty"`
// path to get the new permission
// (--bind-data, --file, etc.)
Inner T `json:"path"`
}
func (p *PermConfig[T]) Path() string { return p.Inner.Path() }
func (p *PermConfig[T]) Len() int {
if p.Mode != nil {
return p.Inner.Len() + 2
} else {
return p.Inner.Len()
}
}
func (p *PermConfig[T]) Append(args *[]string) {
if p.Mode != nil {
*args = append(*args, Perms.String(), strconv.FormatInt(int64(*p.Mode), 8))
}
p.Inner.Append(args)
}
type TmpfsConfig struct {
// set size of tmpfs
// (--size BYTES)
Size int `json:"size,omitempty"`
// mount point of new tmpfs
// (--tmpfs DEST)
Dir string `json:"dir"`
}
func (t *TmpfsConfig) Path() string { return t.Dir }
func (t *TmpfsConfig) Len() int {
if t.Size > 0 {
return 4
} else {
return 2
}
}
func (t *TmpfsConfig) Append(args *[]string) {
if t.Size > 0 {
*args = append(*args, Size.String(), strconv.Itoa(t.Size))
}
*args = append(*args, Tmpfs.String(), t.Dir)
}
type OverlayConfig struct {
/*
read files from SRC in the following overlay
(--overlay-src SRC)
*/
Src []string `json:"src,omitempty"`
/*
mount overlayfs on DEST, with RWSRC as the host path for writes and
WORKDIR an empty directory on the same filesystem as RWSRC
(--overlay RWSRC WORKDIR DEST)
if nil, mount overlayfs on DEST, with writes going to an invisible tmpfs
(--tmp-overlay DEST)
if either strings are empty, mount overlayfs read-only on DEST
(--ro-overlay DEST)
*/
Persist *[2]string `json:"persist,omitempty"`
/*
--overlay RWSRC WORKDIR DEST
--tmp-overlay DEST
--ro-overlay DEST
*/
Dest string `json:"dest"`
}
func (o *OverlayConfig) Path() string { return o.Dest }
func (o *OverlayConfig) Len() int {
// (--tmp-overlay DEST) or (--ro-overlay DEST)
p := 2
// (--overlay RWSRC WORKDIR DEST)
if o.Persist != nil && o.Persist[0] != "" && o.Persist[1] != "" {
p = 4
}
return p + len(o.Src)*2
}
func (o *OverlayConfig) Append(args *[]string) {
// --overlay-src SRC
for _, src := range o.Src {
*args = append(*args, OverlaySrc.String(), src)
}
if o.Persist != nil {
if o.Persist[0] != "" && o.Persist[1] != "" {
// --overlay RWSRC WORKDIR
*args = append(*args, Overlay.String(), o.Persist[0], o.Persist[1])
} else {
// --ro-overlay
*args = append(*args, ROOverlay.String())
}
} else {
// --tmp-overlay
*args = append(*args, TmpOverlay.String())
}
// DEST
*args = append(*args, o.Dest)
}
type SymlinkConfig [2]string
func (s SymlinkConfig) Path() string { return s[1] }
func (s SymlinkConfig) Len() int { return 3 }
func (s SymlinkConfig) Append(args *[]string) { *args = append(*args, Symlink.String(), s[0], s[1]) }
type ChmodConfig map[string]os.FileMode
func (c ChmodConfig) Len() int { return len(c) }
func (c ChmodConfig) Append(args *[]string) {
for path, mode := range c {
*args = append(*args, Chmod.String(), strconv.FormatInt(int64(mode), 8), path)
}
}
const (
DataWrite = iota
DataBind
DataROBind
)
type DataConfig struct {
Dest string `json:"dest"`
Data []byte `json:"data,omitempty"`
Type int `json:"type"`
proc.File
}
func (d *DataConfig) Path() string { return d.Dest }
func (d *DataConfig) Len() int {
if d == nil || d.Data == nil {
return 0
}
return 3
}
func (d *DataConfig) Init(fd uintptr, v **os.File) uintptr {
if d.File != nil {
panic("file initialised twice")
}
d.File = proc.NewWriterTo(d)
return d.File.Init(fd, v)
}
func (d *DataConfig) WriteTo(w io.Writer) (int64, error) {
n, err := w.Write(d.Data)
return int64(n), err
}
func (d *DataConfig) Append(args *[]string) {
if d == nil || d.Data == nil {
return
}
var a PositionalArg
switch d.Type {
case DataWrite:
a = File
case DataBind:
a = BindData
case DataROBind:
a = ROBindData
default:
panic(fmt.Sprintf("invalid type %d", a))
}
*args = append(*args, a.String(), strconv.Itoa(int(d.Fd())), d.Dest)
}
|
