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moby--moby/daemon/container_operations_unix.go
Phil Estes 8119809b68 Correct secrets permissions when userns enabled
Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com>
2016-11-09 14:27:46 -05:00

348 lines
10 KiB
Go

// +build linux freebsd
package daemon
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
"syscall"
"time"
"github.com/Sirupsen/logrus"
"github.com/cloudflare/cfssl/log"
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/docker/container"
"github.com/docker/docker/daemon/links"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/mount"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/docker/runconfig"
"github.com/docker/libnetwork"
"github.com/opencontainers/runc/libcontainer/configs"
"github.com/opencontainers/runc/libcontainer/devices"
"github.com/opencontainers/runc/libcontainer/label"
"github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
)
func u32Ptr(i int64) *uint32 { u := uint32(i); return &u }
func fmPtr(i int64) *os.FileMode { fm := os.FileMode(i); return &fm }
func (daemon *Daemon) setupLinkedContainers(container *container.Container) ([]string, error) {
var env []string
children := daemon.children(container)
bridgeSettings := container.NetworkSettings.Networks[runconfig.DefaultDaemonNetworkMode().NetworkName()]
if bridgeSettings == nil || bridgeSettings.EndpointSettings == nil {
return nil, nil
}
for linkAlias, child := range children {
if !child.IsRunning() {
return nil, fmt.Errorf("Cannot link to a non running container: %s AS %s", child.Name, linkAlias)
}
childBridgeSettings := child.NetworkSettings.Networks[runconfig.DefaultDaemonNetworkMode().NetworkName()]
if childBridgeSettings == nil || childBridgeSettings.EndpointSettings == nil {
return nil, fmt.Errorf("container %s not attached to default bridge network", child.ID)
}
link := links.NewLink(
bridgeSettings.IPAddress,
childBridgeSettings.IPAddress,
linkAlias,
child.Config.Env,
child.Config.ExposedPorts,
)
env = append(env, link.ToEnv()...)
}
return env, nil
}
func (daemon *Daemon) getIpcContainer(container *container.Container) (*container.Container, error) {
containerID := container.HostConfig.IpcMode.Container()
c, err := daemon.GetContainer(containerID)
if err != nil {
return nil, err
}
if !c.IsRunning() {
return nil, fmt.Errorf("cannot join IPC of a non running container: %s", containerID)
}
if c.IsRestarting() {
return nil, errContainerIsRestarting(container.ID)
}
return c, nil
}
func (daemon *Daemon) getPidContainer(container *container.Container) (*container.Container, error) {
containerID := container.HostConfig.PidMode.Container()
c, err := daemon.GetContainer(containerID)
if err != nil {
return nil, err
}
if !c.IsRunning() {
return nil, fmt.Errorf("cannot join PID of a non running container: %s", containerID)
}
if c.IsRestarting() {
return nil, errContainerIsRestarting(container.ID)
}
return c, nil
}
func (daemon *Daemon) setupIpcDirs(c *container.Container) error {
var err error
c.ShmPath, err = c.ShmResourcePath()
if err != nil {
return err
}
if c.HostConfig.IpcMode.IsContainer() {
ic, err := daemon.getIpcContainer(c)
if err != nil {
return err
}
c.ShmPath = ic.ShmPath
} else if c.HostConfig.IpcMode.IsHost() {
if _, err := os.Stat("/dev/shm"); err != nil {
return fmt.Errorf("/dev/shm is not mounted, but must be for --ipc=host")
}
c.ShmPath = "/dev/shm"
} else {
rootUID, rootGID := daemon.GetRemappedUIDGID()
if !c.HasMountFor("/dev/shm") {
shmPath, err := c.ShmResourcePath()
if err != nil {
return err
}
if err := idtools.MkdirAllAs(shmPath, 0700, rootUID, rootGID); err != nil {
return err
}
shmSize := container.DefaultSHMSize
if c.HostConfig.ShmSize != 0 {
shmSize = c.HostConfig.ShmSize
}
shmproperty := "mode=1777,size=" + strconv.FormatInt(shmSize, 10)
if err := syscall.Mount("shm", shmPath, "tmpfs", uintptr(syscall.MS_NOEXEC|syscall.MS_NOSUID|syscall.MS_NODEV), label.FormatMountLabel(shmproperty, c.GetMountLabel())); err != nil {
return fmt.Errorf("mounting shm tmpfs: %s", err)
}
if err := os.Chown(shmPath, rootUID, rootGID); err != nil {
return err
}
}
}
return nil
}
func (daemon *Daemon) setupSecretDir(c *container.Container) (setupErr error) {
if len(c.Secrets) == 0 {
return nil
}
localMountPath := c.SecretMountPath()
logrus.Debugf("secrets: setting up secret dir: %s", localMountPath)
defer func() {
if setupErr != nil {
// cleanup
_ = detachMounted(localMountPath)
if err := os.RemoveAll(localMountPath); err != nil {
log.Errorf("error cleaning up secret mount: %s", err)
}
}
}()
// retrieve possible remapped range start for root UID, GID
rootUID, rootGID := daemon.GetRemappedUIDGID()
// create tmpfs
if err := idtools.MkdirAllAs(localMountPath, 0700, rootUID, rootGID); err != nil {
return errors.Wrap(err, "error creating secret local mount path")
}
tmpfsOwnership := fmt.Sprintf("uid=%d,gid=%d", rootUID, rootGID)
if err := mount.Mount("tmpfs", localMountPath, "tmpfs", "nodev,nosuid,noexec,"+tmpfsOwnership); err != nil {
return errors.Wrap(err, "unable to setup secret mount")
}
for _, s := range c.Secrets {
targetPath := filepath.Clean(s.Target)
// ensure that the target is a filename only; no paths allowed
if targetPath != filepath.Base(targetPath) {
return fmt.Errorf("error creating secret: secret must not be a path")
}
fPath := filepath.Join(localMountPath, targetPath)
if err := idtools.MkdirAllAs(filepath.Dir(fPath), 0700, rootUID, rootGID); err != nil {
return errors.Wrap(err, "error creating secret mount path")
}
logrus.WithFields(logrus.Fields{
"name": s.Name,
"path": fPath,
}).Debug("injecting secret")
if err := ioutil.WriteFile(fPath, s.Data, s.Mode); err != nil {
return errors.Wrap(err, "error injecting secret")
}
uid, err := strconv.Atoi(s.UID)
if err != nil {
return err
}
gid, err := strconv.Atoi(s.GID)
if err != nil {
return err
}
if err := os.Chown(fPath, rootUID+uid, rootGID+gid); err != nil {
return errors.Wrap(err, "error setting ownership for secret")
}
}
// remount secrets ro
if err := mount.Mount("tmpfs", localMountPath, "tmpfs", "remount,ro,"+tmpfsOwnership); err != nil {
return errors.Wrap(err, "unable to remount secret dir as readonly")
}
return nil
}
func killProcessDirectly(container *container.Container) error {
if _, err := container.WaitStop(10 * time.Second); err != nil {
// Ensure that we don't kill ourselves
if pid := container.GetPID(); pid != 0 {
logrus.Infof("Container %s failed to exit within 10 seconds of kill - trying direct SIGKILL", stringid.TruncateID(container.ID))
if err := syscall.Kill(pid, 9); err != nil {
if err != syscall.ESRCH {
return err
}
e := errNoSuchProcess{pid, 9}
logrus.Debug(e)
return e
}
}
}
return nil
}
func specDevice(d *configs.Device) specs.Device {
return specs.Device{
Type: string(d.Type),
Path: d.Path,
Major: d.Major,
Minor: d.Minor,
FileMode: fmPtr(int64(d.FileMode)),
UID: u32Ptr(int64(d.Uid)),
GID: u32Ptr(int64(d.Gid)),
}
}
func specDeviceCgroup(d *configs.Device) specs.DeviceCgroup {
t := string(d.Type)
return specs.DeviceCgroup{
Allow: true,
Type: &t,
Major: &d.Major,
Minor: &d.Minor,
Access: &d.Permissions,
}
}
func getDevicesFromPath(deviceMapping containertypes.DeviceMapping) (devs []specs.Device, devPermissions []specs.DeviceCgroup, err error) {
resolvedPathOnHost := deviceMapping.PathOnHost
// check if it is a symbolic link
if src, e := os.Lstat(deviceMapping.PathOnHost); e == nil && src.Mode()&os.ModeSymlink == os.ModeSymlink {
if linkedPathOnHost, e := filepath.EvalSymlinks(deviceMapping.PathOnHost); e == nil {
resolvedPathOnHost = linkedPathOnHost
}
}
device, err := devices.DeviceFromPath(resolvedPathOnHost, deviceMapping.CgroupPermissions)
// if there was no error, return the device
if err == nil {
device.Path = deviceMapping.PathInContainer
return append(devs, specDevice(device)), append(devPermissions, specDeviceCgroup(device)), nil
}
// if the device is not a device node
// try to see if it's a directory holding many devices
if err == devices.ErrNotADevice {
// check if it is a directory
if src, e := os.Stat(resolvedPathOnHost); e == nil && src.IsDir() {
// mount the internal devices recursively
filepath.Walk(resolvedPathOnHost, func(dpath string, f os.FileInfo, e error) error {
childDevice, e := devices.DeviceFromPath(dpath, deviceMapping.CgroupPermissions)
if e != nil {
// ignore the device
return nil
}
// add the device to userSpecified devices
childDevice.Path = strings.Replace(dpath, resolvedPathOnHost, deviceMapping.PathInContainer, 1)
devs = append(devs, specDevice(childDevice))
devPermissions = append(devPermissions, specDeviceCgroup(childDevice))
return nil
})
}
}
if len(devs) > 0 {
return devs, devPermissions, nil
}
return devs, devPermissions, fmt.Errorf("error gathering device information while adding custom device %q: %s", deviceMapping.PathOnHost, err)
}
func detachMounted(path string) error {
return syscall.Unmount(path, syscall.MNT_DETACH)
}
func isLinkable(child *container.Container) bool {
// A container is linkable only if it belongs to the default network
_, ok := child.NetworkSettings.Networks[runconfig.DefaultDaemonNetworkMode().NetworkName()]
return ok
}
func enableIPOnPredefinedNetwork() bool {
return false
}
func (daemon *Daemon) isNetworkHotPluggable() bool {
return true
}
func setupPathsAndSandboxOptions(container *container.Container, sboxOptions *[]libnetwork.SandboxOption) error {
var err error
container.HostsPath, err = container.GetRootResourcePath("hosts")
if err != nil {
return err
}
*sboxOptions = append(*sboxOptions, libnetwork.OptionHostsPath(container.HostsPath))
container.ResolvConfPath, err = container.GetRootResourcePath("resolv.conf")
if err != nil {
return err
}
*sboxOptions = append(*sboxOptions, libnetwork.OptionResolvConfPath(container.ResolvConfPath))
return nil
}
func initializeNetworkingPaths(container *container.Container, nc *container.Container) {
container.HostnamePath = nc.HostnamePath
container.HostsPath = nc.HostsPath
container.ResolvConfPath = nc.ResolvConfPath
}