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package bwrap
import (
"encoding/gob"
"os"
"strconv"
)
func init() {
gob.Register(new(PermConfig[SymlinkConfig]))
gob.Register(new(PermConfig[*TmpfsConfig]))
}
type Config struct {
// unshare every namespace we support by default if nil
// (--unshare-all)
Unshare *UnshareConfig `json:"unshare,omitempty"`
// retain the network namespace (can only combine with nil Unshare)
// (--share-net)
Net bool `json:"net"`
// disable further use of user namespaces inside sandbox and fail unless
// further use of user namespace inside sandbox is disabled if false
// (--disable-userns) (--assert-userns-disabled)
UserNS bool `json:"userns"`
// custom uid in the sandbox, requires new user namespace
// (--uid UID)
UID *int `json:"uid,omitempty"`
// custom gid in the sandbox, requires new user namespace
// (--gid GID)
GID *int `json:"gid,omitempty"`
// custom hostname in the sandbox, requires new uts namespace
// (--hostname NAME)
Hostname string `json:"hostname,omitempty"`
// change directory
// (--chdir DIR)
Chdir string `json:"chdir,omitempty"`
// unset all environment variables
// (--clearenv)
Clearenv bool `json:"clearenv"`
// set environment variable
// (--setenv VAR VALUE)
SetEnv map[string]string `json:"setenv,omitempty"`
// unset environment variables
// (--unsetenv VAR)
UnsetEnv []string `json:"unsetenv,omitempty"`
// take a lock on file while sandbox is running
// (--lock-file DEST)
LockFile []string `json:"lock_file,omitempty"`
// ordered filesystem args
Filesystem []FSBuilder
// change permissions (must already exist)
// (--chmod OCTAL PATH)
Chmod ChmodConfig `json:"chmod,omitempty"`
// create a new terminal session
// (--new-session)
NewSession bool `json:"new_session"`
// kills with SIGKILL child process (COMMAND) when bwrap or bwrap's parent dies.
// (--die-with-parent)
DieWithParent bool `json:"die_with_parent"`
// do not install a reaper process with PID=1
// (--as-pid-1)
AsInit bool `json:"as_init"`
// keep this fd open while sandbox is running
// (--sync-fd FD)
sync *os.File
/* unmapped options include:
--unshare-user-try Create new user namespace if possible else continue by skipping it
--unshare-cgroup-try Create new cgroup namespace if possible else continue by skipping it
--userns FD Use this user namespace (cannot combine with --unshare-user)
--userns2 FD After setup switch to this user namespace, only useful with --userns
--pidns FD Use this pid namespace (as parent namespace if using --unshare-pid)
--exec-label LABEL Exec label for the sandbox
--file-label LABEL File label for temporary sandbox content
--file FD DEST Copy from FD to destination DEST
--bind-data FD DEST Copy from FD to file which is bind-mounted on DEST
--ro-bind-data FD DEST Copy from FD to file which is readonly bind-mounted on DEST
--seccomp FD Load and use seccomp rules from FD (not repeatable)
--add-seccomp-fd FD Load and use seccomp rules from FD (repeatable)
--block-fd FD Block on FD until some data to read is available
--userns-block-fd FD Block on FD until the user namespace is ready
--info-fd FD Write information about the running container to FD
--json-status-fd FD Write container status to FD as multiple JSON documents
--cap-add CAP Add cap CAP when running as privileged user
--cap-drop CAP Drop cap CAP when running as privileged user
among which --args is used internally for passing arguments */
}
// Sync keep this fd open while sandbox is running
// (--sync-fd FD)
func (c *Config) Sync() *os.File {
return c.sync
}
type UnshareConfig struct {
// (--unshare-user)
// create new user namespace
User bool `json:"user"`
// (--unshare-ipc)
// create new ipc namespace
IPC bool `json:"ipc"`
// (--unshare-pid)
// create new pid namespace
PID bool `json:"pid"`
// (--unshare-net)
// create new network namespace
Net bool `json:"net"`
// (--unshare-uts)
// create new uts namespace
UTS bool `json:"uts"`
// (--unshare-cgroup)
// create new cgroup namespace
CGroup bool `json:"cgroup"`
}
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, intArgs[Perms], 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, intArgs[Size], strconv.Itoa(t.Size))
}
*args = append(*args, awkwardArgs[Tmpfs], t.Dir)
}
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, awkwardArgs[Symlink], 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, pairArgs[Chmod], strconv.FormatInt(int64(mode), 8), path)
}
}
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