package util import ( "encoding/json" "fmt" "math" "os" "os/user" "path/filepath" "regexp" "strconv" "strings" "sync" "syscall" "time" "github.com/BurntSushi/toml" "github.com/containers/common/pkg/config" "github.com/containers/image/v5/types" "github.com/containers/podman/v3/pkg/errorhandling" "github.com/containers/podman/v3/pkg/namespaces" "github.com/containers/podman/v3/pkg/rootless" "github.com/containers/podman/v3/pkg/signal" "github.com/containers/storage/pkg/idtools" stypes "github.com/containers/storage/types" v1 "github.com/opencontainers/image-spec/specs-go/v1" "github.com/opencontainers/runtime-spec/specs-go" "github.com/pkg/errors" "github.com/sirupsen/logrus" "golang.org/x/crypto/ssh/terminal" ) var containerConfig *config.Config func init() { var err error containerConfig, err = config.Default() if err != nil { logrus.Error(err) os.Exit(1) } } // 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 } // StringMatchRegexSlice determines if a given string matches one of the given regexes, returns bool func StringMatchRegexSlice(s string, re []string) bool { for _, r := range re { m, err := regexp.MatchString(r, s) if err == nil && m { return true } } return false } // ImageConfig is a wrapper around the OCIv1 Image Configuration struct exported // by containers/image, but containing additional fields that are not supported // by OCIv1 (but are by Docker v2) - notably OnBuild. type ImageConfig struct { v1.ImageConfig OnBuild []string } // GetImageConfig produces a v1.ImageConfig from the --change flag that is // accepted by several Podman commands. It accepts a (limited subset) of // Dockerfile instructions. func GetImageConfig(changes []string) (ImageConfig, error) { // Valid changes: // USER // EXPOSE // ENV // ENTRYPOINT // CMD // VOLUME // WORKDIR // LABEL // STOPSIGNAL // ONBUILD config := ImageConfig{} for _, change := range changes { // First, let's assume proper Dockerfile format - space // separator between instruction and value split := strings.SplitN(change, " ", 2) if len(split) != 2 { split = strings.SplitN(change, "=", 2) if len(split) != 2 { return ImageConfig{}, errors.Errorf("invalid change %q - must be formatted as KEY VALUE", change) } } outerKey := strings.ToUpper(strings.TrimSpace(split[0])) value := strings.TrimSpace(split[1]) switch outerKey { case "USER": // Assume literal contents are the user. if value == "" { return ImageConfig{}, errors.Errorf("invalid change %q - must provide a value to USER", change) } config.User = value case "EXPOSE": // EXPOSE is either [portnum] or // [portnum]/[proto] // Protocol must be "tcp" or "udp" splitPort := strings.Split(value, "/") if len(splitPort) > 2 { return ImageConfig{}, errors.Errorf("invalid change %q - EXPOSE port must be formatted as PORT[/PROTO]", change) } portNum, err := strconv.Atoi(splitPort[0]) if err != nil { return ImageConfig{}, errors.Wrapf(err, "invalid change %q - EXPOSE port must be an integer", change) } if portNum > 65535 || portNum <= 0 { return ImageConfig{}, errors.Errorf("invalid change %q - EXPOSE port must be a valid port number", change) } proto := "tcp" if len(splitPort) > 1 { testProto := strings.ToLower(splitPort[1]) switch testProto { case "tcp", "udp": proto = testProto default: return ImageConfig{}, errors.Errorf("invalid change %q - EXPOSE protocol must be TCP or UDP", change) } } if config.ExposedPorts == nil { config.ExposedPorts = make(map[string]struct{}) } config.ExposedPorts[fmt.Sprintf("%d/%s", portNum, proto)] = struct{}{} case "ENV": // Format is either: // ENV key=value // ENV key=value key=value ... // ENV key value // Both keys and values can be surrounded by quotes to group them. // For now: we only support key=value // We will attempt to strip quotation marks if present. var ( key, val string ) splitEnv := strings.SplitN(value, "=", 2) key = splitEnv[0] // We do need a key if key == "" { return ImageConfig{}, errors.Errorf("invalid change %q - ENV must have at least one argument", change) } // Perfectly valid to not have a value if len(splitEnv) == 2 { val = splitEnv[1] } if strings.HasPrefix(key, `"`) && strings.HasSuffix(key, `"`) { key = strings.TrimPrefix(strings.TrimSuffix(key, `"`), `"`) } if strings.HasPrefix(val, `"`) && strings.HasSuffix(val, `"`) { val = strings.TrimPrefix(strings.TrimSuffix(val, `"`), `"`) } config.Env = append(config.Env, fmt.Sprintf("%s=%s", key, val)) case "ENTRYPOINT": // Two valid forms. // First, JSON array. // Second, not a JSON array - we interpret this as an // argument to `sh -c`, unless empty, in which case we // just use a blank entrypoint. testUnmarshal := []string{} if err := json.Unmarshal([]byte(value), &testUnmarshal); err != nil { // It ain't valid JSON, so assume it's an // argument to sh -c if not empty. if value != "" { config.Entrypoint = []string{"/bin/sh", "-c", value} } else { config.Entrypoint = []string{} } } else { // Valid JSON config.Entrypoint = testUnmarshal } case "CMD": // Same valid forms as entrypoint. // However, where ENTRYPOINT assumes that 'ENTRYPOINT ' // means no entrypoint, CMD assumes it is 'sh -c' with // no third argument. testUnmarshal := []string{} if err := json.Unmarshal([]byte(value), &testUnmarshal); err != nil { // It ain't valid JSON, so assume it's an // argument to sh -c. // Only include volume if it's not "" config.Cmd = []string{"/bin/sh", "-c"} if value != "" { config.Cmd = append(config.Cmd, value) } } else { // Valid JSON config.Cmd = testUnmarshal } case "VOLUME": // Either a JSON array or a set of space-separated // paths. // Acts rather similar to ENTRYPOINT and CMD, but always // appends rather than replacing, and no sh -c prepend. testUnmarshal := []string{} if err := json.Unmarshal([]byte(value), &testUnmarshal); err != nil { // Not valid JSON, so split on spaces testUnmarshal = strings.Split(value, " ") } if len(testUnmarshal) == 0 { return ImageConfig{}, errors.Errorf("invalid change %q - must provide at least one argument to VOLUME", change) } for _, vol := range testUnmarshal { if vol == "" { return ImageConfig{}, errors.Errorf("invalid change %q - VOLUME paths must not be empty", change) } if config.Volumes == nil { config.Volumes = make(map[string]struct{}) } config.Volumes[vol] = struct{}{} } case "WORKDIR": // This can be passed multiple times. // Each successive invocation is treated as relative to // the previous one - so WORKDIR /A, WORKDIR b, // WORKDIR c results in /A/b/c // Just need to check it's not empty... if value == "" { return ImageConfig{}, errors.Errorf("invalid change %q - must provide a non-empty WORKDIR", change) } config.WorkingDir = filepath.Join(config.WorkingDir, value) case "LABEL": // Same general idea as ENV, but we no longer allow " " // as a separator. // We didn't do that for ENV either, so nice and easy. // Potentially problematic: LABEL might theoretically // allow an = in the key? If people really do this, we // may need to investigate more advanced parsing. var ( key, val string ) splitLabel := strings.SplitN(value, "=", 2) // Unlike ENV, LABEL must have a value if len(splitLabel) != 2 { return ImageConfig{}, errors.Errorf("invalid change %q - LABEL must be formatted key=value", change) } key = splitLabel[0] val = splitLabel[1] if strings.HasPrefix(key, `"`) && strings.HasSuffix(key, `"`) { key = strings.TrimPrefix(strings.TrimSuffix(key, `"`), `"`) } if strings.HasPrefix(val, `"`) && strings.HasSuffix(val, `"`) { val = strings.TrimPrefix(strings.TrimSuffix(val, `"`), `"`) } // Check key after we strip quotations if key == "" { return ImageConfig{}, errors.Errorf("invalid change %q - LABEL must have a non-empty key", change) } if config.Labels == nil { config.Labels = make(map[string]string) } config.Labels[key] = val case "STOPSIGNAL": // Check the provided signal for validity. killSignal, err := ParseSignal(value) if err != nil { return ImageConfig{}, errors.Wrapf(err, "invalid change %q - KILLSIGNAL must be given a valid signal", change) } config.StopSignal = fmt.Sprintf("%d", killSignal) case "ONBUILD": // Onbuild always appends. if value == "" { return ImageConfig{}, errors.Errorf("invalid change %q - ONBUILD must be given an argument", change) } config.OnBuild = append(config.OnBuild, value) default: return ImageConfig{}, errors.Errorf("invalid change %q - invalid instruction %s", change, outerKey) } } return config, nil } // ParseSignal parses and validates a signal name or number. func ParseSignal(rawSignal string) (syscall.Signal, error) { // Strip off leading dash, to allow -1 or -HUP basename := strings.TrimPrefix(rawSignal, "-") sig, err := signal.ParseSignal(basename) if err != nil { return -1, err } // 64 is SIGRTMAX; wish we could get this from a standard Go library if sig < 1 || sig > 64 { return -1, errors.Errorf("valid signals are 1 through 64") } return sig, nil } // GetKeepIDMapping returns the mappings and the user to use when keep-id is used func GetKeepIDMapping() (*stypes.IDMappingOptions, int, int, error) { options := stypes.IDMappingOptions{ HostUIDMapping: true, HostGIDMapping: true, } uid, gid := 0, 0 if rootless.IsRootless() { min := func(a, b int) int { if a < b { return a } return b } uid = rootless.GetRootlessUID() gid = rootless.GetRootlessGID() uids, gids, err := rootless.GetConfiguredMappings() if err != nil { return nil, -1, -1, errors.Wrapf(err, "cannot read mappings") } maxUID, maxGID := 0, 0 for _, u := range uids { maxUID += u.Size } for _, g := range gids { maxGID += g.Size } options.UIDMap, options.GIDMap = nil, nil options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: 0, HostID: 1, Size: min(uid, maxUID)}) options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: uid, HostID: 0, Size: 1}) if maxUID > uid { options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: uid + 1, HostID: uid + 1, Size: maxUID - uid}) } options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: 0, HostID: 1, Size: min(gid, maxGID)}) options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: gid, HostID: 0, Size: 1}) if maxGID > gid { options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: gid + 1, HostID: gid + 1, Size: maxGID - gid}) } options.HostUIDMapping = false options.HostGIDMapping = false } // Simply ignore the setting and do not setup an inner namespace for root as it is a no-op return &options, uid, gid, nil } // ParseIDMapping takes idmappings and subuid and subgid maps and returns a storage mapping func ParseIDMapping(mode namespaces.UsernsMode, uidMapSlice, gidMapSlice []string, subUIDMap, subGIDMap string) (*stypes.IDMappingOptions, error) { options := stypes.IDMappingOptions{ HostUIDMapping: true, HostGIDMapping: true, } if mode.IsAuto() { var err error options.HostUIDMapping = false options.HostGIDMapping = false options.AutoUserNs = true opts, err := mode.GetAutoOptions() if err != nil { return nil, err } options.AutoUserNsOpts = *opts return &options, nil } if mode.IsKeepID() { options.HostUIDMapping = false options.HostGIDMapping = false return &options, nil } 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 subUIDMap != "" && subGIDMap != "" { mappings, err := idtools.NewIDMappings(subUIDMap, subGIDMap) if err != nil { return nil, err } options.UIDMap = mappings.UIDs() options.GIDMap = mappings.GIDs() } parsedUIDMap, err := idtools.ParseIDMap(uidMapSlice, "UID") if err != nil { return nil, err } parsedGIDMap, err := idtools.ParseIDMap(gidMapSlice, "GID") 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 } var ( rootlessConfigHomeDirOnce sync.Once rootlessConfigHomeDir string rootlessRuntimeDirOnce sync.Once rootlessRuntimeDir string ) type tomlOptionsConfig struct { MountProgram string `toml:"mount_program"` } type tomlConfig struct { Storage struct { Driver string `toml:"driver"` RunRoot string `toml:"runroot"` GraphRoot string `toml:"graphroot"` Options struct{ tomlOptionsConfig } `toml:"options"` } `toml:"storage"` } func getTomlStorage(storeOptions *stypes.StoreOptions) *tomlConfig { config := new(tomlConfig) config.Storage.Driver = storeOptions.GraphDriverName config.Storage.RunRoot = storeOptions.RunRoot config.Storage.GraphRoot = storeOptions.GraphRoot for _, i := range storeOptions.GraphDriverOptions { s := strings.SplitN(i, "=", 2) if s[0] == "overlay.mount_program" && len(s) == 2 { config.Storage.Options.MountProgram = s[1] } } return config } // WriteStorageConfigFile writes the configuration to a file func WriteStorageConfigFile(storageOpts *stypes.StoreOptions, storageConf string) error { if err := os.MkdirAll(filepath.Dir(storageConf), 0755); err != nil { return err } storageFile, err := os.OpenFile(storageConf, os.O_RDWR|os.O_TRUNC, 0600) if err != nil { return err } tomlConfiguration := getTomlStorage(storageOpts) defer errorhandling.CloseQuiet(storageFile) enc := toml.NewEncoder(storageFile) if err := enc.Encode(tomlConfiguration); err != nil { if err := os.Remove(storageConf); err != nil { logrus.Error(err) } return err } return nil } // ParseInputTime takes the users input and to determine if it is valid and // returns a time format and error. The input is compared to known time formats // or a duration which implies no-duration func ParseInputTime(inputTime string, since bool) (time.Time, error) { timeFormats := []string{time.RFC3339Nano, time.RFC3339, "2006-01-02T15:04:05", "2006-01-02T15:04:05.999999999", "2006-01-02Z07:00", "2006-01-02"} // iterate the supported time formats for _, tf := range timeFormats { t, err := time.Parse(tf, inputTime) if err == nil { return t, nil } } unixTimestamp, err := strconv.ParseFloat(inputTime, 64) if err == nil { iPart, fPart := math.Modf(unixTimestamp) return time.Unix(int64(iPart), int64(fPart*1_000_000_000)).UTC(), nil } // input might be a duration duration, err := time.ParseDuration(inputTime) if err != nil { return time.Time{}, errors.Errorf("unable to interpret time value") } if since { return time.Now().Add(-duration), nil } return time.Now().Add(duration), nil } // OpenExclusiveFile opens a file for writing and ensure it doesn't already exist func OpenExclusiveFile(path string) (*os.File, error) { baseDir := filepath.Dir(path) if baseDir != "" { if _, err := os.Stat(baseDir); err != nil { return nil, err } } return os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0666) } // ExitCode reads the error message when failing to executing container process // and then returns 0 if no error, 126 if command does not exist, or 127 for // all other errors func ExitCode(err error) int { if err == nil { return 0 } e := strings.ToLower(err.Error()) if strings.Contains(e, "file not found") || strings.Contains(e, "no such file or directory") { return 127 } return 126 } // HomeDir returns the home directory for the current user. func HomeDir() (string, error) { home := os.Getenv("HOME") if home == "" { usr, err := user.LookupId(fmt.Sprintf("%d", rootless.GetRootlessUID())) if err != nil { return "", errors.Wrapf(err, "unable to resolve HOME directory") } home = usr.HomeDir } return home, nil } func Tmpdir() string { tmpdir := os.Getenv("TMPDIR") if tmpdir == "" { tmpdir = "/var/tmp" } return tmpdir } // ValidateSysctls validates a list of sysctl and returns it. func ValidateSysctls(strSlice []string) (map[string]string, error) { sysctl := make(map[string]string) validSysctlMap := map[string]bool{ "kernel.msgmax": true, "kernel.msgmnb": true, "kernel.msgmni": true, "kernel.sem": true, "kernel.shmall": true, "kernel.shmmax": true, "kernel.shmmni": true, "kernel.shm_rmid_forced": true, } validSysctlPrefixes := []string{ "net.", "fs.mqueue.", } for _, val := range strSlice { foundMatch := false arr := strings.Split(val, "=") if len(arr) < 2 { return nil, errors.Errorf("%s is invalid, sysctl values must be in the form of KEY=VALUE", val) } trimmed := fmt.Sprintf("%s=%s", strings.TrimSpace(arr[0]), strings.TrimSpace(arr[1])) if trimmed != val { return nil, errors.Errorf("'%s' is invalid, extra spaces found", val) } if validSysctlMap[arr[0]] { sysctl[arr[0]] = arr[1] continue } for _, prefix := range validSysctlPrefixes { if strings.HasPrefix(arr[0], prefix) { sysctl[arr[0]] = arr[1] foundMatch = true break } } if !foundMatch { return nil, errors.Errorf("sysctl '%s' is not allowed", arr[0]) } } return sysctl, nil } func DefaultContainerConfig() *config.Config { return containerConfig } func CreateCidFile(cidfile string, id string) error { cidFile, err := OpenExclusiveFile(cidfile) if err != nil { if os.IsExist(err) { return errors.Errorf("container id file exists. Ensure another container is not using it or delete %s", cidfile) } return errors.Errorf("error opening cidfile %s", cidfile) } if _, err = cidFile.WriteString(id); err != nil { logrus.Error(err) } cidFile.Close() return nil } // DefaultCPUPeriod is the default CPU period is 100us, which is the same default // as Kubernetes. const DefaultCPUPeriod uint64 = 100000 // CoresToPeriodAndQuota converts a fraction of cores to the equivalent // Completely Fair Scheduler (CFS) parameters period and quota. // // Cores is a fraction of the CFS period that a container may use. Period and // Quota are in microseconds. func CoresToPeriodAndQuota(cores float64) (uint64, int64) { return DefaultCPUPeriod, int64(cores * float64(DefaultCPUPeriod)) } // PeriodAndQuotaToCores takes the CFS parameters period and quota and returns // a fraction that represents the limit to the number of cores that can be // utilized over the scheduling period. // // Cores is a fraction of the CFS period that a container may use. Period and // Quota are in microseconds. func PeriodAndQuotaToCores(period uint64, quota int64) float64 { return float64(quota) / float64(period) } // IDtoolsToRuntimeSpec converts idtools ID mapping to the one of the runtime spec. func IDtoolsToRuntimeSpec(idMaps []idtools.IDMap) (convertedIDMap []specs.LinuxIDMapping) { for _, idmap := range idMaps { tempIDMap := specs.LinuxIDMapping{ ContainerID: uint32(idmap.ContainerID), HostID: uint32(idmap.HostID), Size: uint32(idmap.Size), } convertedIDMap = append(convertedIDMap, tempIDMap) } return convertedIDMap } var socketPath string func SetSocketPath(path string) { socketPath = path } func SocketPath() (string, error) { if socketPath != "" { return socketPath, nil } xdg, err := GetRuntimeDir() if err != nil { return "", err } if len(xdg) == 0 { // If no xdg is returned, assume root socket xdg = "/run" } // Glue the socket path together return filepath.Join(xdg, "podman", "podman.sock"), nil } func LookupUser(name string) (*user.User, error) { // Assume UID look up first, if it fails lookup by username if u, err := user.LookupId(name); err == nil { return u, err } return user.Lookup(name) }