mirror of
https://github.com/drakkan/sftpgo.git
synced 2024-11-22 23:50:32 +00:00
658 lines
18 KiB
Go
658 lines
18 KiB
Go
// Copyright (C) 2019-2022 Nicola Murino
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published
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// by the Free Software Foundation, version 3.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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// Package util provides some common utility methods
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package util
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import (
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"bytes"
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"crypto/ecdsa"
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"crypto/ed25519"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/rsa"
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"crypto/tls"
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"crypto/x509"
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"encoding/pem"
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"errors"
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"fmt"
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"html/template"
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"io"
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"io/fs"
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"net"
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"net/http"
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"net/url"
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"os"
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"path"
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"path/filepath"
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"regexp"
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"runtime"
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"strings"
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"time"
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"github.com/google/uuid"
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"github.com/lithammer/shortuuid/v3"
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"github.com/rs/xid"
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"golang.org/x/crypto/ssh"
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"github.com/drakkan/sftpgo/v2/logger"
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)
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const (
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logSender = "util"
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osWindows = "windows"
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)
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var (
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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}])))\\.?$")
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// this can be set at build time
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additionalSharedDataSearchPath = ""
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)
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// Contains reports whether v is present in elems.
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func Contains[T comparable](elems []T, v T) bool {
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for _, s := range elems {
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if v == s {
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return true
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}
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}
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return false
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}
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// IsStringPrefixInSlice searches a string prefix in a slice and returns true
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// if a matching prefix is found
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func IsStringPrefixInSlice(obj string, list []string) bool {
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for i := 0; i < len(list); i++ {
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if strings.HasPrefix(obj, list[i]) {
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return true
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}
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}
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return false
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}
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// RemoveDuplicates returns a new slice removing any duplicate element from the initial one
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func RemoveDuplicates(obj []string, trim bool) []string {
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if len(obj) == 0 {
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return obj
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}
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seen := make(map[string]bool)
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validIdx := 0
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for _, item := range obj {
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if trim {
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item = strings.TrimSpace(item)
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}
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if !seen[item] {
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seen[item] = true
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obj[validIdx] = item
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validIdx++
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}
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}
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return obj[:validIdx]
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}
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// GetTimeAsMsSinceEpoch returns unix timestamp as milliseconds from a time struct
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func GetTimeAsMsSinceEpoch(t time.Time) int64 {
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return t.UnixMilli()
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}
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// GetTimeFromMsecSinceEpoch return a time struct from a unix timestamp with millisecond precision
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func GetTimeFromMsecSinceEpoch(msec int64) time.Time {
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return time.Unix(0, msec*1000000)
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}
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// GetDurationAsString returns a string representation for a time.Duration
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func GetDurationAsString(d time.Duration) string {
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d = d.Round(time.Second)
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h := d / time.Hour
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d -= h * time.Hour
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m := d / time.Minute
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d -= m * time.Minute
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s := d / time.Second
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if h > 0 {
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return fmt.Sprintf("%02d:%02d:%02d", h, m, s)
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}
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return fmt.Sprintf("%02d:%02d", m, s)
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}
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// ByteCountSI returns humanized size in SI (decimal) format
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func ByteCountSI(b int64) string {
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return byteCount(b, 1000)
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}
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// ByteCountIEC returns humanized size in IEC (binary) format
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func ByteCountIEC(b int64) string {
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return byteCount(b, 1024)
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}
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func byteCount(b int64, unit int64) string {
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if b < unit {
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return fmt.Sprintf("%d B", b)
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}
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div, exp := unit, 0
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for n := b / unit; n >= unit; n /= unit {
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div *= unit
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exp++
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}
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if unit == 1000 {
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return fmt.Sprintf("%.1f %cB",
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float64(b)/float64(div), "KMGTPE"[exp])
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}
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return fmt.Sprintf("%.1f %ciB",
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float64(b)/float64(div), "KMGTPE"[exp])
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}
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// GetIPFromRemoteAddress returns the IP from the remote address.
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// If the given remote address cannot be parsed it will be returned unchanged
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func GetIPFromRemoteAddress(remoteAddress string) string {
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ip, _, err := net.SplitHostPort(remoteAddress)
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if err == nil {
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return ip
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}
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return remoteAddress
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}
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// NilIfEmpty returns nil if the input string is empty
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func NilIfEmpty(s string) *string {
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if s == "" {
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return nil
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}
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return &s
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}
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// GetStringFromPointer returns the string value or empty if nil
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func GetStringFromPointer(val *string) string {
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if val == nil {
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return ""
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}
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return *val
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}
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// GetIntFromPointer returns the int value or zero
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func GetIntFromPointer(val *int64) int64 {
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if val == nil {
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return 0
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}
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return *val
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}
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// GetTimeFromPointer returns the time value or now
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func GetTimeFromPointer(val *time.Time) time.Time {
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if val == nil {
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return time.Now()
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}
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return *val
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}
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// GenerateRSAKeys generate rsa private and public keys and write the
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// private key to specified file and the public key to the specified
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// file adding the .pub suffix
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func GenerateRSAKeys(file string) error {
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if err := createDirPathIfMissing(file, 0700); err != nil {
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return err
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}
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key, err := rsa.GenerateKey(rand.Reader, 4096)
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if err != nil {
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return err
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}
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o, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return err
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}
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defer o.Close()
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priv := &pem.Block{
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Type: "RSA PRIVATE KEY",
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Bytes: x509.MarshalPKCS1PrivateKey(key),
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}
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if err := pem.Encode(o, priv); err != nil {
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return err
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}
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pub, err := ssh.NewPublicKey(&key.PublicKey)
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if err != nil {
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return err
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}
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return os.WriteFile(file+".pub", ssh.MarshalAuthorizedKey(pub), 0600)
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}
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// GenerateECDSAKeys generate ecdsa private and public keys and write the
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// private key to specified file and the public key to the specified
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// file adding the .pub suffix
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func GenerateECDSAKeys(file string) error {
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if err := createDirPathIfMissing(file, 0700); err != nil {
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return err
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}
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key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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if err != nil {
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return err
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}
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keyBytes, err := x509.MarshalECPrivateKey(key)
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if err != nil {
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return err
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}
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priv := &pem.Block{
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Type: "EC PRIVATE KEY",
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Bytes: keyBytes,
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}
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o, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return err
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}
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defer o.Close()
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if err := pem.Encode(o, priv); err != nil {
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return err
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}
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pub, err := ssh.NewPublicKey(&key.PublicKey)
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if err != nil {
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return err
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}
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return os.WriteFile(file+".pub", ssh.MarshalAuthorizedKey(pub), 0600)
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}
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// GenerateEd25519Keys generate ed25519 private and public keys and write the
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// private key to specified file and the public key to the specified
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// file adding the .pub suffix
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func GenerateEd25519Keys(file string) error {
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pubKey, privKey, err := ed25519.GenerateKey(rand.Reader)
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if err != nil {
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return err
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}
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keyBytes, err := x509.MarshalPKCS8PrivateKey(privKey)
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if err != nil {
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return err
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}
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priv := &pem.Block{
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Type: "PRIVATE KEY",
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Bytes: keyBytes,
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}
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o, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return err
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}
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defer o.Close()
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if err := pem.Encode(o, priv); err != nil {
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return err
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}
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pub, err := ssh.NewPublicKey(pubKey)
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if err != nil {
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return err
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}
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return os.WriteFile(file+".pub", ssh.MarshalAuthorizedKey(pub), 0600)
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}
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// GetDirsForVirtualPath returns all the directory for the given path in reverse order
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// for example if the path is: /1/2/3/4 it returns:
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// [ "/1/2/3/4", "/1/2/3", "/1/2", "/1", "/" ]
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func GetDirsForVirtualPath(virtualPath string) []string {
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if virtualPath == "" || virtualPath == "." {
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virtualPath = "/"
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} else {
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if !path.IsAbs(virtualPath) {
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virtualPath = CleanPath(virtualPath)
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}
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}
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dirsForPath := []string{virtualPath}
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for {
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if virtualPath == "/" {
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break
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}
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virtualPath = path.Dir(virtualPath)
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dirsForPath = append(dirsForPath, virtualPath)
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}
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return dirsForPath
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}
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// CleanPath returns a clean POSIX (/) absolute path to work with
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func CleanPath(p string) string {
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p = filepath.ToSlash(p)
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if !path.IsAbs(p) {
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p = "/" + p
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}
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return path.Clean(p)
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}
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// LoadTemplate parses the given template paths.
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// It behaves like template.Must but it writes a log before exiting.
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// You can optionally provide a base template (e.g. to define some custom functions)
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func LoadTemplate(base *template.Template, paths ...string) *template.Template {
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var t *template.Template
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var err error
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if base != nil {
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base, err = base.Clone()
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if err == nil {
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t, err = base.ParseFiles(paths...)
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}
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} else {
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t, err = template.ParseFiles(paths...)
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}
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if err != nil {
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logger.ErrorToConsole("error loading required template: %v", err)
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logger.Error(logSender, "", "error loading required template: %v", err)
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panic(err)
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}
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return t
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}
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// IsFileInputValid returns true this is a valid file name.
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// This method must be used before joining a file name, generally provided as
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// user input, with a directory
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func IsFileInputValid(fileInput string) bool {
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cleanInput := filepath.Clean(fileInput)
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if cleanInput == "." || cleanInput == ".." {
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return false
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}
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return true
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}
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// FindSharedDataPath searches for the specified directory name in searchDir
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// and in system-wide shared data directories.
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// If name is an absolute path it is returned unmodified.
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func FindSharedDataPath(name, searchDir string) string {
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if !IsFileInputValid(name) {
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return ""
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}
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if name != "" && !filepath.IsAbs(name) {
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searchList := []string{searchDir}
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if additionalSharedDataSearchPath != "" {
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searchList = append(searchList, additionalSharedDataSearchPath)
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}
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if runtime.GOOS != osWindows {
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searchList = append(searchList, "/usr/share/sftpgo")
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searchList = append(searchList, "/usr/local/share/sftpgo")
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}
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searchList = RemoveDuplicates(searchList, false)
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for _, basePath := range searchList {
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res := filepath.Join(basePath, name)
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_, err := os.Stat(res)
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if err == nil {
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logger.Debug(logSender, "", "found share data path for name %#v: %#v", name, res)
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return res
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}
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}
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return filepath.Join(searchDir, name)
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}
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return name
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}
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// CleanDirInput sanitizes user input for directories.
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// On Windows it removes any trailing `"`.
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// We try to help windows users that set an invalid path such as "C:\ProgramData\SFTPGO\".
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// This will only help if the invalid path is the last argument, for example in this command:
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// sftpgo.exe serve -c "C:\ProgramData\SFTPGO\" -l "sftpgo.log"
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// the -l flag will be ignored and the -c flag will get the value `C:\ProgramData\SFTPGO" -l sftpgo.log`
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// since the backslash after SFTPGO escape the double quote. This is definitely a bad user input
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func CleanDirInput(dirInput string) string {
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if runtime.GOOS == osWindows {
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for strings.HasSuffix(dirInput, "\"") {
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dirInput = strings.TrimSuffix(dirInput, "\"")
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}
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}
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return filepath.Clean(dirInput)
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}
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func createDirPathIfMissing(file string, perm os.FileMode) error {
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dirPath := filepath.Dir(file)
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if _, err := os.Stat(dirPath); errors.Is(err, fs.ErrNotExist) {
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err = os.MkdirAll(dirPath, perm)
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if err != nil {
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return err
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}
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}
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return nil
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}
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// GenerateRandomBytes generates the secret to use for JWT auth
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func GenerateRandomBytes(length int) []byte {
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b := make([]byte, length)
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_, err := io.ReadFull(rand.Reader, b)
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if err == nil {
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return b
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}
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b = xid.New().Bytes()
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for len(b) < length {
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b = append(b, xid.New().Bytes()...)
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}
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return b[:length]
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}
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// GenerateUniqueID retuens an unique ID
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func GenerateUniqueID() string {
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u, err := uuid.NewRandom()
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if err != nil {
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return xid.New().String()
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}
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return shortuuid.DefaultEncoder.Encode(u)
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}
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// HTTPListenAndServe is a wrapper for ListenAndServe that support both tcp
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// and Unix-domain sockets
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func HTTPListenAndServe(srv *http.Server, address string, port int, isTLS bool, logSender string) error {
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var listener net.Listener
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var err error
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if filepath.IsAbs(address) && runtime.GOOS != osWindows {
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if !IsFileInputValid(address) {
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return fmt.Errorf("invalid socket address %#v", address)
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}
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err = createDirPathIfMissing(address, os.ModePerm)
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if err != nil {
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logger.ErrorToConsole("error creating Unix-domain socket parent dir: %v", err)
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logger.Error(logSender, "", "error creating Unix-domain socket parent dir: %v", err)
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}
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os.Remove(address)
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listener, err = newListener("unix", address, srv.ReadTimeout, srv.WriteTimeout)
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} else {
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CheckTCP4Port(port)
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listener, err = newListener("tcp", fmt.Sprintf("%s:%d", address, port), srv.ReadTimeout, srv.WriteTimeout)
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}
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if err != nil {
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return err
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}
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logger.Info(logSender, "", "server listener registered, address: %v TLS enabled: %v", listener.Addr().String(), isTLS)
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defer listener.Close()
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if isTLS {
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return srv.ServeTLS(listener, "", "")
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}
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return srv.Serve(listener)
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}
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// GetTLSCiphersFromNames returns the TLS ciphers from the specified names
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func GetTLSCiphersFromNames(cipherNames []string) []uint16 {
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var ciphers []uint16
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|
|
|
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)
|
|
}
|