| // +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 |
| } |