package util import ( "fmt" "os" "os/exec" "path/filepath" "strconv" "strings" "syscall" "github.com/BurntSushi/toml" "github.com/containers/image/types" "github.com/containers/libpod/pkg/rootless" "github.com/containers/storage" "github.com/containers/storage/pkg/idtools" "github.com/opencontainers/image-spec/specs-go/v1" "github.com/pkg/errors" "golang.org/x/crypto/ssh/terminal" ) // Helper function to determine the username/password passed // in the creds string. It could be either or both. func parseCreds(creds string) (string, string) { if creds == "" { return "", "" } up := strings.SplitN(creds, ":", 2) if len(up) == 1 { return up[0], "" } return up[0], up[1] } // ParseRegistryCreds takes a credentials string in the form USERNAME:PASSWORD // and returns a DockerAuthConfig func ParseRegistryCreds(creds string) (*types.DockerAuthConfig, error) { username, password := parseCreds(creds) if username == "" { fmt.Print("Username: ") fmt.Scanln(&username) } if password == "" { fmt.Print("Password: ") termPassword, err := terminal.ReadPassword(0) if err != nil { return nil, errors.Wrapf(err, "could not read password from terminal") } password = string(termPassword) } return &types.DockerAuthConfig{ Username: username, Password: password, }, nil } // StringInSlice determines if a string is in a string slice, returns bool func StringInSlice(s string, sl []string) bool { for _, i := range sl { if i == s { return true } } return false } // GetImageConfig converts the --change flag values in the format "CMD=/bin/bash USER=example" // to a type v1.ImageConfig func GetImageConfig(changes []string) (v1.ImageConfig, error) { // USER=value | EXPOSE=value | ENV=value | ENTRYPOINT=value | // CMD=value | VOLUME=value | WORKDIR=value | LABEL=key=value | STOPSIGNAL=value var ( user string env []string entrypoint []string cmd []string workingDir string stopSignal string ) exposedPorts := make(map[string]struct{}) volumes := make(map[string]struct{}) labels := make(map[string]string) for _, ch := range changes { pair := strings.Split(ch, "=") if len(pair) == 1 { return v1.ImageConfig{}, errors.Errorf("no value given for instruction %q", ch) } switch pair[0] { case "USER": user = pair[1] case "EXPOSE": var st struct{} exposedPorts[pair[1]] = st case "ENV": env = append(env, pair[1]) case "ENTRYPOINT": entrypoint = append(entrypoint, pair[1]) case "CMD": cmd = append(cmd, pair[1]) case "VOLUME": var st struct{} volumes[pair[1]] = st case "WORKDIR": workingDir = pair[1] case "LABEL": if len(pair) == 3 { labels[pair[1]] = pair[2] } else { labels[pair[1]] = "" } case "STOPSIGNAL": stopSignal = pair[1] } } return v1.ImageConfig{ User: user, ExposedPorts: exposedPorts, Env: env, Entrypoint: entrypoint, Cmd: cmd, Volumes: volumes, WorkingDir: workingDir, Labels: labels, StopSignal: stopSignal, }, nil } // ParseIDMapping takes idmappings and subuid and subgid maps and returns a storage mapping func ParseIDMapping(UIDMapSlice, GIDMapSlice []string, subUIDMap, subGIDMap string) (*storage.IDMappingOptions, error) { options := storage.IDMappingOptions{ HostUIDMapping: true, HostGIDMapping: true, } if subGIDMap == "" && subUIDMap != "" { subGIDMap = subUIDMap } if subUIDMap == "" && subGIDMap != "" { subUIDMap = subGIDMap } if len(GIDMapSlice) == 0 && len(UIDMapSlice) != 0 { GIDMapSlice = UIDMapSlice } if len(UIDMapSlice) == 0 && len(GIDMapSlice) != 0 { UIDMapSlice = GIDMapSlice } if len(UIDMapSlice) == 0 && subUIDMap == "" && os.Getuid() != 0 { UIDMapSlice = []string{fmt.Sprintf("0:%d:1", os.Getuid())} } if len(GIDMapSlice) == 0 && subGIDMap == "" && os.Getuid() != 0 { GIDMapSlice = []string{fmt.Sprintf("0:%d:1", os.Getgid())} } parseTriple := func(spec []string) (container, host, size int, err error) { cid, err := strconv.ParseUint(spec[0], 10, 32) if err != nil { return 0, 0, 0, fmt.Errorf("error parsing id map value %q: %v", spec[0], err) } hid, err := strconv.ParseUint(spec[1], 10, 32) if err != nil { return 0, 0, 0, fmt.Errorf("error parsing id map value %q: %v", spec[1], err) } sz, err := strconv.ParseUint(spec[2], 10, 32) if err != nil { return 0, 0, 0, fmt.Errorf("error parsing id map value %q: %v", spec[2], err) } return int(cid), int(hid), int(sz), nil } parseIDMap := func(spec []string) (idmap []idtools.IDMap, err error) { for _, uid := range spec { splitmap := strings.SplitN(uid, ":", 3) if len(splitmap) < 3 { return nil, fmt.Errorf("invalid mapping requires 3 fields: %q", uid) } cid, hid, size, err := parseTriple(splitmap) if err != nil { return nil, err } pmap := idtools.IDMap{ ContainerID: cid, HostID: hid, Size: size, } idmap = append(idmap, pmap) } return idmap, nil } if subUIDMap != "" && subGIDMap != "" { mappings, err := idtools.NewIDMappings(subUIDMap, subGIDMap) if err != nil { return nil, err } options.UIDMap = mappings.UIDs() options.GIDMap = mappings.GIDs() } parsedUIDMap, err := parseIDMap(UIDMapSlice) if err != nil { return nil, err } parsedGIDMap, err := parseIDMap(GIDMapSlice) if err != nil { return nil, err } options.UIDMap = append(options.UIDMap, parsedUIDMap...) options.GIDMap = append(options.GIDMap, parsedGIDMap...) if len(options.UIDMap) > 0 { options.HostUIDMapping = false } if len(options.GIDMap) > 0 { options.HostGIDMapping = false } return &options, nil } // GetRootlessRuntimeDir returns the runtime directory when running as non root func GetRootlessRuntimeDir() (string, error) { runtimeDir := os.Getenv("XDG_RUNTIME_DIR") uid := fmt.Sprintf("%d", rootless.GetRootlessUID()) if runtimeDir == "" { tmpDir := filepath.Join("/run", "user", uid) os.MkdirAll(tmpDir, 0700) st, err := os.Stat(tmpDir) if err == nil && int(st.Sys().(*syscall.Stat_t).Uid) == os.Getuid() && st.Mode().Perm() == 0700 { runtimeDir = tmpDir } } if runtimeDir == "" { tmpDir := filepath.Join(os.TempDir(), "user", uid) os.MkdirAll(tmpDir, 0700) st, err := os.Stat(tmpDir) if err == nil && int(st.Sys().(*syscall.Stat_t).Uid) == os.Getuid() && st.Mode().Perm() == 0700 { runtimeDir = tmpDir } } if runtimeDir == "" { home := os.Getenv("HOME") if home == "" { return "", fmt.Errorf("neither XDG_RUNTIME_DIR nor HOME was set non-empty") } resolvedHome, err := filepath.EvalSymlinks(home) if err != nil { return "", errors.Wrapf(err, "cannot resolve %s", home) } runtimeDir = filepath.Join(resolvedHome, "rundir") } return runtimeDir, nil } // GetRootlessStorageOpts returns the storage ops for containers running as non root func GetRootlessStorageOpts() (storage.StoreOptions, error) { var opts storage.StoreOptions rootlessRuntime, err := GetRootlessRuntimeDir() if err != nil { return opts, err } opts.RunRoot = rootlessRuntime dataDir := os.Getenv("XDG_DATA_HOME") if dataDir == "" { home := os.Getenv("HOME") if home == "" { return opts, fmt.Errorf("neither XDG_DATA_HOME nor HOME was set non-empty") } // runc doesn't like symlinks in the rootfs path, and at least // on CoreOS /home is a symlink to /var/home, so resolve any symlink. resolvedHome, err := filepath.EvalSymlinks(home) if err != nil { return opts, errors.Wrapf(err, "cannot resolve %s", home) } dataDir = filepath.Join(resolvedHome, ".local", "share") } opts.GraphRoot = filepath.Join(dataDir, "containers", "storage") if path, err := exec.LookPath("fuse-overlayfs"); err == nil { opts.GraphDriverName = "overlay" opts.GraphDriverOptions = []string{fmt.Sprintf("overlay.mount_program=%s", path)} } else { opts.GraphDriverName = "vfs" } return opts, nil } // GetDefaultStoreOptions returns the storage ops for containers func GetDefaultStoreOptions() (storage.StoreOptions, error) { storageOpts := storage.DefaultStoreOptions if rootless.IsRootless() { var err error storageOpts, err = GetRootlessStorageOpts() if err != nil { return storageOpts, err } storageConf := filepath.Join(os.Getenv("HOME"), ".config/containers/storage.conf") if _, err := os.Stat(storageConf); err == nil { storage.ReloadConfigurationFile(storageConf, &storageOpts) } else if os.IsNotExist(err) { os.MkdirAll(filepath.Dir(storageConf), 0755) file, err := os.OpenFile(storageConf, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0666) if err != nil { return storageOpts, errors.Wrapf(err, "cannot open %s", storageConf) } defer file.Close() enc := toml.NewEncoder(file) if err := enc.Encode(storageOpts); err != nil { os.Remove(storageConf) } } } return storageOpts, nil }