mirror of
https://github.com/moby/moby.git
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145 lines
3.1 KiB
Go
145 lines
3.1 KiB
Go
// Copyright (c) 2013, Suryandaru Triandana <syndtr@gmail.com>
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// All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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package capability
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import (
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"syscall"
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"unsafe"
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)
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type capHeader struct {
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version uint32
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pid int
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}
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type capData struct {
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effective uint32
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permitted uint32
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inheritable uint32
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}
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func capget(hdr *capHeader, data *capData) (err error) {
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_, _, e1 := syscall.Syscall(syscall.SYS_CAPGET, uintptr(unsafe.Pointer(hdr)), uintptr(unsafe.Pointer(data)), 0)
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if e1 != 0 {
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err = e1
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}
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return
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}
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func capset(hdr *capHeader, data *capData) (err error) {
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_, _, e1 := syscall.Syscall(syscall.SYS_CAPSET, uintptr(unsafe.Pointer(hdr)), uintptr(unsafe.Pointer(data)), 0)
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if e1 != 0 {
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err = e1
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}
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return
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}
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func prctl(option int, arg2, arg3, arg4, arg5 uintptr) (err error) {
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_, _, e1 := syscall.Syscall6(syscall.SYS_PRCTL, uintptr(option), arg2, arg3, arg4, arg5, 0)
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if e1 != 0 {
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err = e1
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}
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return
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}
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const (
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vfsXattrName = "security.capability"
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vfsCapVerMask = 0xff000000
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vfsCapVer1 = 0x01000000
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vfsCapVer2 = 0x02000000
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vfsCapFlagMask = ^vfsCapVerMask
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vfsCapFlageffective = 0x000001
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vfscapDataSizeV1 = 4 * (1 + 2*1)
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vfscapDataSizeV2 = 4 * (1 + 2*2)
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)
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type vfscapData struct {
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magic uint32
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data [2]struct {
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permitted uint32
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inheritable uint32
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}
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effective [2]uint32
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version int8
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}
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var (
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_vfsXattrName *byte
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)
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func init() {
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_vfsXattrName, _ = syscall.BytePtrFromString(vfsXattrName)
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}
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func getVfsCap(path string, dest *vfscapData) (err error) {
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var _p0 *byte
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_p0, err = syscall.BytePtrFromString(path)
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if err != nil {
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return
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}
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r0, _, e1 := syscall.Syscall6(syscall.SYS_GETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_vfsXattrName)), uintptr(unsafe.Pointer(dest)), vfscapDataSizeV2, 0, 0)
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if e1 != 0 {
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if e1 == syscall.ENODATA {
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dest.version = 2
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return
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}
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err = e1
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}
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switch dest.magic & vfsCapVerMask {
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case vfsCapVer1:
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dest.version = 1
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if r0 != vfscapDataSizeV1 {
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return syscall.EINVAL
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}
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dest.data[1].permitted = 0
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dest.data[1].inheritable = 0
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case vfsCapVer2:
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dest.version = 2
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if r0 != vfscapDataSizeV2 {
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return syscall.EINVAL
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}
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default:
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return syscall.EINVAL
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}
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if dest.magic&vfsCapFlageffective != 0 {
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dest.effective[0] = dest.data[0].permitted | dest.data[0].inheritable
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dest.effective[1] = dest.data[1].permitted | dest.data[1].inheritable
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} else {
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dest.effective[0] = 0
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dest.effective[1] = 0
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}
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return
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}
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func setVfsCap(path string, data *vfscapData) (err error) {
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var _p0 *byte
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_p0, err = syscall.BytePtrFromString(path)
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if err != nil {
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return
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}
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var size uintptr
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if data.version == 1 {
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data.magic = vfsCapVer1
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size = vfscapDataSizeV1
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} else if data.version == 2 {
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data.magic = vfsCapVer2
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if data.effective[0] != 0 || data.effective[1] != 0 {
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data.magic |= vfsCapFlageffective
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}
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size = vfscapDataSizeV2
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} else {
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return syscall.EINVAL
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}
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_, _, e1 := syscall.Syscall6(syscall.SYS_SETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_vfsXattrName)), uintptr(unsafe.Pointer(data)), size, 0, 0)
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if e1 != 0 {
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err = e1
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}
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return
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}
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