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util.go
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util.go
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// Copyright (C) 2019-2022 Nicola Murino
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, version 3.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
// Package util provides some common utility methods
package util
import (
"bytes"
"crypto/ecdsa"
"crypto/ed25519"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"io"
"io/fs"
"math"
"net"
"net/http"
"net/url"
"os"
"path"
"path/filepath"
"regexp"
"runtime"
"strconv"
"strings"
"time"
"unicode"
"github.com/google/uuid"
"github.com/lithammer/shortuuid/v3"
"github.com/rs/xid"
"golang.org/x/crypto/ssh"
"github.com/drakkan/sftpgo/v2/internal/logger"
)
const (
logSender = "util"
osWindows = "windows"
)
var (
emailRegex = regexp.MustCompile("^(?:(?:(?:(?:[a-zA-Z]|\\d|[!#\\$%&'\\*\\+\\-\\/=\\?\\^_`{\\|}~]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])+(?:\\.([a-zA-Z]|\\d|[!#\\$%&'\\*\\+\\-\\/=\\?\\^_`{\\|}~]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])+)*)|(?:(?:\\x22)(?:(?:(?:(?:\\x20|\\x09)*(?:\\x0d\\x0a))?(?:\\x20|\\x09)+)?(?:(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f]|\\x21|[\\x23-\\x5b]|[\\x5d-\\x7e]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])|(?:(?:[\\x01-\\x09\\x0b\\x0c\\x0d-\\x7f]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}]))))*(?:(?:(?:\\x20|\\x09)*(?:\\x0d\\x0a))?(\\x20|\\x09)+)?(?:\\x22))))@(?:(?:(?:[a-zA-Z]|\\d|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])|(?:(?:[a-zA-Z]|\\d|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])(?:[a-zA-Z]|\\d|-|\\.|~|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])*(?:[a-zA-Z]|\\d|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])))\\.)+(?:(?:[a-zA-Z]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])|(?:(?:[a-zA-Z]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])(?:[a-zA-Z]|\\d|-|\\.|~|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])*(?:[a-zA-Z]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])))\\.?$")
// this can be set at build time
additionalSharedDataSearchPath = ""
)
// IEC Sizes.
// kibis of bits
const (
oneByte = 1 << (iota * 10)
kiByte
miByte
giByte
tiByte
piByte
eiByte
)
// SI Sizes.
const (
iByte = 1
kbByte = iByte * 1000
mByte = kbByte * 1000
gByte = mByte * 1000
tByte = gByte * 1000
pByte = tByte * 1000
eByte = pByte * 1000
)
var bytesSizeTable = map[string]uint64{
"b": oneByte,
"kib": kiByte,
"kb": kbByte,
"mib": miByte,
"mb": mByte,
"gib": giByte,
"gb": gByte,
"tib": tiByte,
"tb": tByte,
"pib": piByte,
"pb": pByte,
"eib": eiByte,
"eb": eByte,
// Without suffix
"": oneByte,
"ki": kiByte,
"k": kbByte,
"mi": miByte,
"m": mByte,
"gi": giByte,
"g": gByte,
"ti": tiByte,
"t": tByte,
"pi": piByte,
"p": pByte,
"ei": eiByte,
"e": eByte,
}
// Contains reports whether v is present in elems.
func Contains[T comparable](elems []T, v T) bool {
for _, s := range elems {
if v == s {
return true
}
}
return false
}
// IsStringPrefixInSlice searches a string prefix in a slice and returns true
// if a matching prefix is found
func IsStringPrefixInSlice(obj string, list []string) bool {
for i := 0; i < len(list); i++ {
if strings.HasPrefix(obj, list[i]) {
return true
}
}
return false
}
// RemoveDuplicates returns a new slice removing any duplicate element from the initial one
func RemoveDuplicates(obj []string, trim bool) []string {
if len(obj) == 0 {
return obj
}
seen := make(map[string]bool)
validIdx := 0
for _, item := range obj {
if trim {
item = strings.TrimSpace(item)
}
if !seen[item] {
seen[item] = true
obj[validIdx] = item
validIdx++
}
}
return obj[:validIdx]
}
// GetTimeAsMsSinceEpoch returns unix timestamp as milliseconds from a time struct
func GetTimeAsMsSinceEpoch(t time.Time) int64 {
return t.UnixMilli()
}
// GetTimeFromMsecSinceEpoch return a time struct from a unix timestamp with millisecond precision
func GetTimeFromMsecSinceEpoch(msec int64) time.Time {
return time.Unix(0, msec*1000000)
}
// GetDurationAsString returns a string representation for a time.Duration
func GetDurationAsString(d time.Duration) string {
d = d.Round(time.Second)
h := d / time.Hour
d -= h * time.Hour
m := d / time.Minute
d -= m * time.Minute
s := d / time.Second
if h > 0 {
return fmt.Sprintf("%02d:%02d:%02d", h, m, s)
}
return fmt.Sprintf("%02d:%02d", m, s)
}
// ByteCountSI returns humanized size in SI (decimal) format
func ByteCountSI(b int64) string {
return byteCount(b, 1000, true)
}
// ByteCountIEC returns humanized size in IEC (binary) format
func ByteCountIEC(b int64) string {
return byteCount(b, 1024, false)
}
func byteCount(b int64, unit int64, maxPrecision bool) string {
if b <= 0 && maxPrecision {
return strconv.FormatInt(b, 10)
}
if b < unit {
return fmt.Sprintf("%d B", b)
}
div, exp := unit, 0
for n := b / unit; n >= unit; n /= unit {
div *= unit
exp++
}
var val string
if maxPrecision {
val = strconv.FormatFloat(float64(b)/float64(div), 'f', -1, 64)
} else {
val = fmt.Sprintf("%.1f", float64(b)/float64(div))
}
if unit == 1000 {
return fmt.Sprintf("%s %cB", val, "KMGTPE"[exp])
}
return fmt.Sprintf("%s %ciB", val, "KMGTPE"[exp])
}
// ParseBytes parses a string representation of bytes into the number
// of bytes it represents.
//
// ParseBytes("42 MB") -> 42000000, nil
// ParseBytes("42 mib") -> 44040192, nil
//
// copied from here:
//
// https://github.com/dustin/go-humanize/blob/master/bytes.go
//
// with minor modifications
func ParseBytes(s string) (int64, error) {
s = strings.TrimSpace(s)
lastDigit := 0
hasComma := false
for _, r := range s {
if !(unicode.IsDigit(r) || r == '.' || r == ',') {
break
}
if r == ',' {
hasComma = true
}
lastDigit++
}
num := s[:lastDigit]
if hasComma {
num = strings.Replace(num, ",", "", -1)
}
f, err := strconv.ParseFloat(num, 64)
if err != nil {
return 0, err
}
extra := strings.ToLower(strings.TrimSpace(s[lastDigit:]))
if m, ok := bytesSizeTable[extra]; ok {
f *= float64(m)
if f >= math.MaxInt64 {
return 0, fmt.Errorf("value too large: %v", s)
}
if f < 0 {
return 0, fmt.Errorf("negative value not allowed: %v", s)
}
return int64(f), nil
}
return 0, fmt.Errorf("unhandled size name: %v", extra)
}
// GetIPFromRemoteAddress returns the IP from the remote address.
// If the given remote address cannot be parsed it will be returned unchanged
func GetIPFromRemoteAddress(remoteAddress string) string {
ip, _, err := net.SplitHostPort(remoteAddress)
if err == nil {
return ip
}
return remoteAddress
}
// NilIfEmpty returns nil if the input string is empty
func NilIfEmpty(s string) *string {
if s == "" {
return nil
}
return &s
}
// GetStringFromPointer returns the string value or empty if nil
func GetStringFromPointer(val *string) string {
if val == nil {
return ""
}
return *val
}
// GetIntFromPointer returns the int value or zero
func GetIntFromPointer(val *int64) int64 {
if val == nil {
return 0
}
return *val
}
// GetTimeFromPointer returns the time value or now
func GetTimeFromPointer(val *time.Time) time.Time {
if val == nil {
return time.Now()
}
return *val
}
// GenerateRSAKeys generate rsa private and public keys and write the
// private key to specified file and the public key to the specified
// file adding the .pub suffix
func GenerateRSAKeys(file string) error {
if err := createDirPathIfMissing(file, 0700); err != nil {
return err
}
key, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
return err
}
o, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
defer o.Close()
priv := &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(key),
}
if err := pem.Encode(o, priv); err != nil {
return err
}
pub, err := ssh.NewPublicKey(&key.PublicKey)
if err != nil {
return err
}
return os.WriteFile(file+".pub", ssh.MarshalAuthorizedKey(pub), 0600)
}
// GenerateECDSAKeys generate ecdsa private and public keys and write the
// private key to specified file and the public key to the specified
// file adding the .pub suffix
func GenerateECDSAKeys(file string) error {
if err := createDirPathIfMissing(file, 0700); err != nil {
return err
}
key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
return err
}
keyBytes, err := x509.MarshalECPrivateKey(key)
if err != nil {
return err
}
priv := &pem.Block{
Type: "EC PRIVATE KEY",
Bytes: keyBytes,
}
o, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
defer o.Close()
if err := pem.Encode(o, priv); err != nil {
return err
}
pub, err := ssh.NewPublicKey(&key.PublicKey)
if err != nil {
return err
}
return os.WriteFile(file+".pub", ssh.MarshalAuthorizedKey(pub), 0600)
}
// GenerateEd25519Keys generate ed25519 private and public keys and write the
// private key to specified file and the public key to the specified
// file adding the .pub suffix
func GenerateEd25519Keys(file string) error {
pubKey, privKey, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
return err
}
keyBytes, err := x509.MarshalPKCS8PrivateKey(privKey)
if err != nil {
return err
}
priv := &pem.Block{
Type: "PRIVATE KEY",
Bytes: keyBytes,
}
o, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
defer o.Close()
if err := pem.Encode(o, priv); err != nil {
return err
}
pub, err := ssh.NewPublicKey(pubKey)
if err != nil {
return err
}
return os.WriteFile(file+".pub", ssh.MarshalAuthorizedKey(pub), 0600)
}
// GetDirsForVirtualPath returns all the directory for the given path in reverse order
// for example if the path is: /1/2/3/4 it returns:
// [ "/1/2/3/4", "/1/2/3", "/1/2", "/1", "/" ]
func GetDirsForVirtualPath(virtualPath string) []string {
if virtualPath == "" || virtualPath == "." {
virtualPath = "/"
} else {
if !path.IsAbs(virtualPath) {
virtualPath = CleanPath(virtualPath)
}
}
dirsForPath := []string{virtualPath}
for {
if virtualPath == "/" {
break
}
virtualPath = path.Dir(virtualPath)
dirsForPath = append(dirsForPath, virtualPath)
}
return dirsForPath
}
// CleanPath returns a clean POSIX (/) absolute path to work with
func CleanPath(p string) string {
return CleanPathWithBase("/", p)
}
// CleanPathWithBase returns a clean POSIX (/) absolute path to work with.
// The specified base will be used if the provided path is not absolute
func CleanPathWithBase(base, p string) string {
p = filepath.ToSlash(p)
if !path.IsAbs(p) {
p = path.Join(base, p)
}
return path.Clean(p)
}
// IsFileInputValid returns true this is a valid file name.
// This method must be used before joining a file name, generally provided as
// user input, with a directory
func IsFileInputValid(fileInput string) bool {
cleanInput := filepath.Clean(fileInput)
if cleanInput == "." || cleanInput == ".." {
return false
}
return true
}
// CleanDirInput sanitizes user input for directories.
// On Windows it removes any trailing `"`.
// We try to help windows users that set an invalid path such as "C:\ProgramData\SFTPGO\".
// This will only help if the invalid path is the last argument, for example in this command:
// sftpgo.exe serve -c "C:\ProgramData\SFTPGO\" -l "sftpgo.log"
// the -l flag will be ignored and the -c flag will get the value `C:\ProgramData\SFTPGO" -l sftpgo.log`
// since the backslash after SFTPGO escape the double quote. This is definitely a bad user input
func CleanDirInput(dirInput string) string {
if runtime.GOOS == osWindows {
for strings.HasSuffix(dirInput, "\"") {
dirInput = strings.TrimSuffix(dirInput, "\"")
}
}
return filepath.Clean(dirInput)
}
func createDirPathIfMissing(file string, perm os.FileMode) error {
dirPath := filepath.Dir(file)
if _, err := os.Stat(dirPath); errors.Is(err, fs.ErrNotExist) {
err = os.MkdirAll(dirPath, perm)
if err != nil {
return err
}
}
return nil
}
// GenerateRandomBytes generates the secret to use for JWT auth
func GenerateRandomBytes(length int) []byte {
b := make([]byte, length)
_, err := io.ReadFull(rand.Reader, b)
if err == nil {
return b
}
b = xid.New().Bytes()
for len(b) < length {
b = append(b, xid.New().Bytes()...)
}
return b[:length]
}
// GenerateUniqueID retuens an unique ID
func GenerateUniqueID() string {
u, err := uuid.NewRandom()
if err != nil {
return xid.New().String()
}
return shortuuid.DefaultEncoder.Encode(u)
}
// HTTPListenAndServe is a wrapper for ListenAndServe that support both tcp
// and Unix-domain sockets
func HTTPListenAndServe(srv *http.Server, address string, port int, isTLS bool, logSender string) error {
var listener net.Listener
var err error
if filepath.IsAbs(address) && runtime.GOOS != osWindows {
if !IsFileInputValid(address) {
return fmt.Errorf("invalid socket address %#v", address)
}
err = createDirPathIfMissing(address, os.ModePerm)
if err != nil {
logger.ErrorToConsole("error creating Unix-domain socket parent dir: %v", err)
logger.Error(logSender, "", "error creating Unix-domain socket parent dir: %v", err)
}
os.Remove(address)
listener, err = newListener("unix", address, srv.ReadTimeout, srv.WriteTimeout)
} else {
CheckTCP4Port(port)
listener, err = newListener("tcp", fmt.Sprintf("%s:%d", address, port), srv.ReadTimeout, srv.WriteTimeout)
}
if err != nil {
return err
}
logger.Info(logSender, "", "server listener registered, address: %v TLS enabled: %v", listener.Addr().String(), isTLS)
defer listener.Close()
if isTLS {
return srv.ServeTLS(listener, "", "")
}
return srv.Serve(listener)
}
// GetTLSCiphersFromNames returns the TLS ciphers from the specified names
func GetTLSCiphersFromNames(cipherNames []string) []uint16 {
var ciphers []uint16
for _, name := range RemoveDuplicates(cipherNames, false) {
for _, c := range tls.CipherSuites() {
if c.Name == strings.TrimSpace(name) {
ciphers = append(ciphers, c.ID)
}
}
}
return ciphers
}
// EncodeTLSCertToPem returns the specified certificate PEM encoded.
// This can be verified using openssl x509 -in cert.crt -text -noout
func EncodeTLSCertToPem(tlsCert *x509.Certificate) (string, error) {
if len(tlsCert.Raw) == 0 {
return "", errors.New("invalid x509 certificate, no der contents")
}
publicKeyBlock := pem.Block{
Type: "CERTIFICATE",
Bytes: tlsCert.Raw,
}
return string(pem.EncodeToMemory(&publicKeyBlock)), nil
}
// CheckTCP4Port quits the app if bind on the given IPv4 port fails.
// This is a ugly hack to avoid to bind on an already used port.
// It is required on Windows only. Upstream does not consider this
// behaviour a bug:
// https://github.com/golang/go/issues/45150
func CheckTCP4Port(port int) {
if runtime.GOOS != osWindows {
return
}
listener, err := net.Listen("tcp4", fmt.Sprintf(":%d", port))
if err != nil {
logger.ErrorToConsole("unable to bind on tcp4 address: %v", err)
logger.Error(logSender, "", "unable to bind on tcp4 address: %v", err)
os.Exit(1)
}
listener.Close()
}
// IsByteArrayEmpty return true if the byte array is empty or a new line
func IsByteArrayEmpty(b []byte) bool {
if len(b) == 0 {
return true
}
if bytes.Equal(b, []byte("\n")) {
return true
}
if bytes.Equal(b, []byte("\r\n")) {
return true
}
return false
}
// GetSSHPublicKeyAsString returns an SSH public key serialized as string
func GetSSHPublicKeyAsString(pubKey []byte) (string, error) {
if len(pubKey) == 0 {
return "", nil
}
k, err := ssh.ParsePublicKey(pubKey)
if err != nil {
return "", err
}
return string(ssh.MarshalAuthorizedKey(k)), nil
}
// GetRealIP returns the ip address as result of parsing either the
// X-Real-IP header or the X-Forwarded-For header
func GetRealIP(r *http.Request, header string, depth int) string {
if header == "" {
return ""
}
var ipAddresses []string
for _, h := range r.Header.Values(header) {
for _, ipStr := range strings.Split(h, ",") {
ipStr = strings.TrimSpace(ipStr)
ipAddresses = append(ipAddresses, ipStr)
}
}
idx := len(ipAddresses) - 1 - depth
if idx >= 0 {
ip := strings.TrimSpace(ipAddresses[idx])
if ip == "" || net.ParseIP(ip) == nil {
return ""
}
return ip
}
return ""
}
// GetHTTPLocalAddress returns the local address for an http.Request
// or empty if it cannot be determined
func GetHTTPLocalAddress(r *http.Request) string {
if r == nil {
return ""
}
localAddr, ok := r.Context().Value(http.LocalAddrContextKey).(net.Addr)
if ok {
return localAddr.String()
}
return ""
}
// ParseAllowedIPAndRanges returns a list of functions that allow to find if an
// IP is equal or is contained within the allowed list
func ParseAllowedIPAndRanges(allowed []string) ([]func(net.IP) bool, error) {
res := make([]func(net.IP) bool, len(allowed))
for i, allowFrom := range allowed {
if strings.LastIndex(allowFrom, "/") > 0 {
_, ipRange, err := net.ParseCIDR(allowFrom)
if err != nil {
return nil, fmt.Errorf("given string %q is not a valid IP range: %v", allowFrom, err)
}
res[i] = ipRange.Contains
} else {
allowed := net.ParseIP(allowFrom)
if allowed == nil {
return nil, fmt.Errorf("given string %q is not a valid IP address", allowFrom)
}
res[i] = allowed.Equal
}
}
return res, nil
}
// GetRedactedURL returns the url redacting the password if any
func GetRedactedURL(rawurl string) string {
if !strings.HasPrefix(rawurl, "http") {
return rawurl
}
u, err := url.Parse(rawurl)
if err != nil {
return rawurl
}
return u.Redacted()
}
// PrependFileInfo prepends a file info to a slice in an efficient way.
// We, optimistically, assume that the slice has enough capacity
func PrependFileInfo(files []os.FileInfo, info os.FileInfo) []os.FileInfo {
files = append(files, nil)
copy(files[1:], files)
files[0] = info
return files
}
// GetTLSVersion returns the TLS version for integer:
// - 12 means TLS 1.2
// - 13 means TLS 1.3
// default is TLS 1.2
func GetTLSVersion(val int) uint16 {
switch val {
case 13:
return tls.VersionTLS13
default:
return tls.VersionTLS12
}
}
// IsEmailValid returns true if the specified email address is valid
func IsEmailValid(email string) bool {
return emailRegex.MatchString(email)
}
// PanicOnError calls panic if err is not nil
func PanicOnError(err error) {
if err != nil {
panic(fmt.Errorf("unexpected error: %w", err))
}
}