218 lines
7.4 KiB
Go
218 lines
7.4 KiB
Go
package daemon
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import (
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"fmt"
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"io/ioutil"
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"path/filepath"
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"strings"
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"github.com/docker/docker/container"
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"github.com/docker/docker/layer"
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"github.com/docker/docker/libcontainerd"
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"github.com/docker/docker/pkg/system"
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"golang.org/x/sys/windows/registry"
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)
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const (
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credentialSpecRegistryLocation = `SOFTWARE\Microsoft\Windows NT\CurrentVersion\Virtualization\Containers\CredentialSpecs`
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credentialSpecFileLocation = "CredentialSpecs"
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)
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func (daemon *Daemon) getLibcontainerdCreateOptions(container *container.Container) ([]libcontainerd.CreateOption, error) {
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createOptions := []libcontainerd.CreateOption{}
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// Are we going to run as a Hyper-V container?
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hvOpts := &libcontainerd.HyperVIsolationOption{}
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if container.HostConfig.Isolation.IsDefault() {
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// Container is set to use the default, so take the default from the daemon configuration
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hvOpts.IsHyperV = daemon.defaultIsolation.IsHyperV()
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} else {
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// Container is requesting an isolation mode. Honour it.
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hvOpts.IsHyperV = container.HostConfig.Isolation.IsHyperV()
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}
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dnsSearch := daemon.getDNSSearchSettings(container)
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if dnsSearch != nil {
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osv := system.GetOSVersion()
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if osv.Build < 14997 {
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return nil, fmt.Errorf("dns-search option is not supported on the current platform")
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}
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}
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// Generate the layer folder of the layer options
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layerOpts := &libcontainerd.LayerOption{}
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m, err := container.RWLayer.Metadata()
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if err != nil {
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return nil, fmt.Errorf("failed to get layer metadata - %s", err)
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}
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if hvOpts.IsHyperV {
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hvOpts.SandboxPath = filepath.Dir(m["dir"])
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}
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layerOpts.LayerFolderPath = m["dir"]
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// Generate the layer paths of the layer options
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img, err := daemon.imageStore.Get(container.ImageID)
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if err != nil {
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return nil, fmt.Errorf("failed to graph.Get on ImageID %s - %s", container.ImageID, err)
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}
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// Get the layer path for each layer.
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max := len(img.RootFS.DiffIDs)
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for i := 1; i <= max; i++ {
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img.RootFS.DiffIDs = img.RootFS.DiffIDs[:i]
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layerPath, err := layer.GetLayerPath(daemon.layerStore, img.RootFS.ChainID())
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if err != nil {
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return nil, fmt.Errorf("failed to get layer path from graphdriver %s for ImageID %s - %s", daemon.layerStore, img.RootFS.ChainID(), err)
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}
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// Reverse order, expecting parent most first
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layerOpts.LayerPaths = append([]string{layerPath}, layerOpts.LayerPaths...)
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}
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// Get endpoints for the libnetwork allocated networks to the container
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var epList []string
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AllowUnqualifiedDNSQuery := false
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gwHNSID := ""
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if container.NetworkSettings != nil {
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for n := range container.NetworkSettings.Networks {
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sn, err := daemon.FindNetwork(n)
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if err != nil {
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continue
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}
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ep, err := container.GetEndpointInNetwork(sn)
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if err != nil {
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continue
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}
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data, err := ep.DriverInfo()
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if err != nil {
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continue
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}
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if data["GW_INFO"] != nil {
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gwInfo := data["GW_INFO"].(map[string]interface{})
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if gwInfo["hnsid"] != nil {
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gwHNSID = gwInfo["hnsid"].(string)
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}
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}
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if data["hnsid"] != nil {
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epList = append(epList, data["hnsid"].(string))
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}
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if data["AllowUnqualifiedDNSQuery"] != nil {
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AllowUnqualifiedDNSQuery = true
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}
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}
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}
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if gwHNSID != "" {
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epList = append(epList, gwHNSID)
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}
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// Read and add credentials from the security options if a credential spec has been provided.
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if container.HostConfig.SecurityOpt != nil {
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for _, sOpt := range container.HostConfig.SecurityOpt {
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sOpt = strings.ToLower(sOpt)
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if !strings.Contains(sOpt, "=") {
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return nil, fmt.Errorf("invalid security option: no equals sign in supplied value %s", sOpt)
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}
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var splitsOpt []string
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splitsOpt = strings.SplitN(sOpt, "=", 2)
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if len(splitsOpt) != 2 {
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return nil, fmt.Errorf("invalid security option: %s", sOpt)
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}
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if splitsOpt[0] != "credentialspec" {
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return nil, fmt.Errorf("security option not supported: %s", splitsOpt[0])
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}
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credentialsOpts := &libcontainerd.CredentialsOption{}
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var (
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match bool
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csValue string
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err error
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)
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if match, csValue = getCredentialSpec("file://", splitsOpt[1]); match {
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if csValue == "" {
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return nil, fmt.Errorf("no value supplied for file:// credential spec security option")
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}
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if credentialsOpts.Credentials, err = readCredentialSpecFile(container.ID, daemon.root, filepath.Clean(csValue)); err != nil {
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return nil, err
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}
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} else if match, csValue = getCredentialSpec("registry://", splitsOpt[1]); match {
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if csValue == "" {
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return nil, fmt.Errorf("no value supplied for registry:// credential spec security option")
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}
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if credentialsOpts.Credentials, err = readCredentialSpecRegistry(container.ID, csValue); err != nil {
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return nil, err
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}
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} else {
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return nil, fmt.Errorf("invalid credential spec security option - value must be prefixed file:// or registry:// followed by a value")
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}
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createOptions = append(createOptions, credentialsOpts)
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}
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}
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// Now add the remaining options.
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createOptions = append(createOptions, &libcontainerd.FlushOption{IgnoreFlushesDuringBoot: !container.HasBeenStartedBefore})
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createOptions = append(createOptions, hvOpts)
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createOptions = append(createOptions, layerOpts)
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if epList != nil {
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createOptions = append(createOptions, &libcontainerd.NetworkEndpointsOption{
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Endpoints: epList,
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AllowUnqualifiedDNSQuery: AllowUnqualifiedDNSQuery,
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DNSSearchList: dnsSearch,
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})
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}
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return createOptions, nil
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}
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// getCredentialSpec is a helper function to get the value of a credential spec supplied
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// on the CLI, stripping the prefix
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func getCredentialSpec(prefix, value string) (bool, string) {
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if strings.HasPrefix(value, prefix) {
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return true, strings.TrimPrefix(value, prefix)
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}
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return false, ""
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}
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// readCredentialSpecRegistry is a helper function to read a credential spec from
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// the registry. If not found, we return an empty string and warn in the log.
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// This allows for staging on machines which do not have the necessary components.
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func readCredentialSpecRegistry(id, name string) (string, error) {
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var (
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k registry.Key
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err error
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val string
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)
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if k, err = registry.OpenKey(registry.LOCAL_MACHINE, credentialSpecRegistryLocation, registry.QUERY_VALUE); err != nil {
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return "", fmt.Errorf("failed handling spec %q for container %s - %s could not be opened", name, id, credentialSpecRegistryLocation)
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}
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if val, _, err = k.GetStringValue(name); err != nil {
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if err == registry.ErrNotExist {
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return "", fmt.Errorf("credential spec %q for container %s as it was not found", name, id)
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}
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return "", fmt.Errorf("error %v reading credential spec %q from registry for container %s", err, name, id)
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}
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return val, nil
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}
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// readCredentialSpecFile is a helper function to read a credential spec from
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// a file. If not found, we return an empty string and warn in the log.
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// This allows for staging on machines which do not have the necessary components.
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func readCredentialSpecFile(id, root, location string) (string, error) {
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if filepath.IsAbs(location) {
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return "", fmt.Errorf("invalid credential spec - file:// path cannot be absolute")
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}
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base := filepath.Join(root, credentialSpecFileLocation)
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full := filepath.Join(base, location)
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if !strings.HasPrefix(full, base) {
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return "", fmt.Errorf("invalid credential spec - file:// path must be under %s", base)
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}
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bcontents, err := ioutil.ReadFile(full)
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if err != nil {
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return "", fmt.Errorf("credential spec '%s' for container %s as the file could not be read: %q", full, id, err)
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}
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return string(bcontents[:]), nil
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}
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