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//go:build linux
// +build linux
package validate
import (
"errors"
"fmt"
"os"
"path/filepath"
"strings"
"syscall"
"github.com/syndtr/gocapability/capability"
multierror "github.com/hashicorp/go-multierror"
rspec "github.com/opencontainers/runtime-spec/specs-go"
osFilepath "github.com/opencontainers/runtime-tools/filepath"
"github.com/opencontainers/runtime-tools/specerror"
"github.com/opencontainers/selinux/go-selinux/label"
"github.com/sirupsen/logrus"
)
// LastCap return last cap of system
func LastCap() capability.Cap {
last := capability.CAP_LAST_CAP
// hack for RHEL6 which has no /proc/sys/kernel/cap_last_cap
if last == capability.Cap(63) {
last = capability.CAP_BLOCK_SUSPEND
}
return last
}
func deviceValid(d rspec.LinuxDevice) bool {
switch d.Type {
case "b", "c", "u":
if d.Major <= 0 || d.Minor <= 0 {
return false
}
case "p":
if d.Major != 0 || d.Minor != 0 {
return false
}
default:
return false
}
return true
}
// CheckLinux checks v.spec.Linux
func (v *Validator) CheckLinux() (errs error) {
logrus.Debugf("check linux")
if v.spec.Linux == nil {
return
}
var nsTypeList = map[rspec.LinuxNamespaceType]struct {
num int
newExist bool
}{
rspec.PIDNamespace: {0, false},
rspec.NetworkNamespace: {0, false},
rspec.MountNamespace: {0, false},
rspec.IPCNamespace: {0, false},
rspec.UTSNamespace: {0, false},
rspec.UserNamespace: {0, false},
rspec.CgroupNamespace: {0, false},
}
for index := 0; index < len(v.spec.Linux.Namespaces); index++ {
ns := v.spec.Linux.Namespaces[index]
if ns.Path != "" && !osFilepath.IsAbs(v.platform, ns.Path) {
errs = multierror.Append(errs, specerror.NewError(specerror.NSPathAbs, fmt.Errorf("namespace.path %q is not an absolute path", ns.Path), rspec.Version))
}
tmpItem := nsTypeList[ns.Type]
tmpItem.num = tmpItem.num + 1
if tmpItem.num > 1 {
errs = multierror.Append(errs, specerror.NewError(specerror.NSErrorOnDup, fmt.Errorf("duplicated namespace %q", ns.Type), rspec.Version))
}
if len(ns.Path) == 0 {
tmpItem.newExist = true
}
nsTypeList[ns.Type] = tmpItem
}
if (len(v.spec.Linux.UIDMappings) > 0 || len(v.spec.Linux.GIDMappings) > 0) && !nsTypeList[rspec.UserNamespace].newExist {
errs = multierror.Append(errs, errors.New("the UID/GID mappings requires a new User namespace to be specified as well"))
}
for k := range v.spec.Linux.Sysctl {
if strings.HasPrefix(k, "net.") && !nsTypeList[rspec.NetworkNamespace].newExist {
errs = multierror.Append(errs, fmt.Errorf("sysctl %v requires a new Network namespace to be specified as well", k))
}
if strings.HasPrefix(k, "fs.mqueue.") {
if !nsTypeList[rspec.MountNamespace].newExist || !nsTypeList[rspec.IPCNamespace].newExist {
errs = multierror.Append(errs, fmt.Errorf("sysctl %v requires a new IPC namespace and Mount namespace to be specified as well", k))
}
}
}
if v.platform == "linux" && !nsTypeList[rspec.UTSNamespace].newExist && v.spec.Hostname != "" {
errs = multierror.Append(errs, fmt.Errorf("on Linux, hostname requires a new UTS namespace to be specified as well"))
}
// Linux devices validation
devList := make(map[string]bool)
devTypeList := make(map[string]bool)
for index := 0; index < len(v.spec.Linux.Devices); index++ {
device := v.spec.Linux.Devices[index]
if !deviceValid(device) {
errs = multierror.Append(errs, fmt.Errorf("device %v is invalid", device))
}
if _, exists := devList[device.Path]; exists {
errs = multierror.Append(errs, fmt.Errorf("device %s is duplicated", device.Path))
} else {
var rootfsPath string
if filepath.IsAbs(v.spec.Root.Path) {
rootfsPath = v.spec.Root.Path
} else {
rootfsPath = filepath.Join(v.bundlePath, v.spec.Root.Path)
}
absPath := filepath.Join(rootfsPath, device.Path)
fi, err := os.Stat(absPath)
if os.IsNotExist(err) {
devList[device.Path] = true
} else if err != nil {
errs = multierror.Append(errs, err)
} else {
fStat, ok := fi.Sys().(*syscall.Stat_t)
if !ok {
errs = multierror.Append(errs, specerror.NewError(specerror.DevicesAvailable,
fmt.Errorf("cannot determine state for device %s", device.Path), rspec.Version))
continue
}
var devType string
switch fStat.Mode & syscall.S_IFMT {
case syscall.S_IFCHR:
devType = "c"
case syscall.S_IFBLK:
devType = "b"
case syscall.S_IFIFO:
devType = "p"
default:
devType = "unmatched"
}
if devType != device.Type || (devType == "c" && device.Type == "u") {
errs = multierror.Append(errs, specerror.NewError(specerror.DevicesFileNotMatch,
fmt.Errorf("unmatched %s already exists in filesystem", device.Path), rspec.Version))
continue
}
if devType != "p" {
dev := fStat.Rdev
major := (dev >> 8) & 0xfff
minor := (dev & 0xff) | ((dev >> 12) & 0xfff00)
if int64(major) != device.Major || int64(minor) != device.Minor {
errs = multierror.Append(errs, specerror.NewError(specerror.DevicesFileNotMatch,
fmt.Errorf("unmatched %s already exists in filesystem", device.Path), rspec.Version))
continue
}
}
if device.FileMode != nil {
expectedPerm := *device.FileMode & os.ModePerm
actualPerm := fi.Mode() & os.ModePerm
if expectedPerm != actualPerm {
errs = multierror.Append(errs, specerror.NewError(specerror.DevicesFileNotMatch,
fmt.Errorf("unmatched %s already exists in filesystem", device.Path), rspec.Version))
continue
}
}
if device.UID != nil {
if *device.UID != fStat.Uid {
errs = multierror.Append(errs, specerror.NewError(specerror.DevicesFileNotMatch,
fmt.Errorf("unmatched %s already exists in filesystem", device.Path), rspec.Version))
continue
}
}
if device.GID != nil {
if *device.GID != fStat.Gid {
errs = multierror.Append(errs, specerror.NewError(specerror.DevicesFileNotMatch,
fmt.Errorf("unmatched %s already exists in filesystem", device.Path), rspec.Version))
continue
}
}
}
}
// unify u->c when comparing, they are synonyms
var devID string
if device.Type == "u" {
devID = fmt.Sprintf("%s:%d:%d", "c", device.Major, device.Minor)
} else {
devID = fmt.Sprintf("%s:%d:%d", device.Type, device.Major, device.Minor)
}
if _, exists := devTypeList[devID]; exists {
logrus.Warnf("%v", specerror.NewError(specerror.DevicesErrorOnDup, fmt.Errorf("type:%s, major:%d and minor:%d for linux devices is duplicated", device.Type, device.Major, device.Minor), rspec.Version))
} else {
devTypeList[devID] = true
}
}
if v.spec.Linux.Resources != nil {
errs = multierror.Append(errs, v.CheckLinuxResources())
}
for _, maskedPath := range v.spec.Linux.MaskedPaths {
if !strings.HasPrefix(maskedPath, "/") {
errs = multierror.Append(errs,
specerror.NewError(
specerror.MaskedPathsAbs,
fmt.Errorf("maskedPath %v is not an absolute path", maskedPath),
rspec.Version))
}
}
for _, readonlyPath := range v.spec.Linux.ReadonlyPaths {
if !strings.HasPrefix(readonlyPath, "/") {
errs = multierror.Append(errs,
specerror.NewError(
specerror.ReadonlyPathsAbs,
fmt.Errorf("readonlyPath %v is not an absolute path", readonlyPath),
rspec.Version))
}
}
if v.spec.Linux.MountLabel != "" {
if err := label.Validate(v.spec.Linux.MountLabel); err != nil {
errs = multierror.Append(errs, fmt.Errorf("mountLabel %v is invalid", v.spec.Linux.MountLabel))
}
}
return
}
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