forked from qvest-digital/loginsrv
/
auth.go
148 lines (132 loc) · 3.29 KB
/
auth.go
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package htpasswd
import (
"bytes"
"crypto/sha1"
"crypto/subtle"
"encoding/base64"
"encoding/csv"
"fmt"
"github.com/abbot/go-http-auth"
"github.com/tarent/loginsrv/logging"
"golang.org/x/crypto/bcrypt"
"io"
"os"
"strings"
"sync"
"time"
)
// File is a struct to serve an individual modTime
type File struct {
name string
// Used in func reloadIfChanged to reload htpasswd file if it changed
modTime time.Time
}
// Auth is the htpassword authenticater
type Auth struct {
filenames []File
userHash map[string]string
muUserHash sync.RWMutex
}
// NewAuth creates an htpassword authenticater
func NewAuth(filenames []string) (*Auth, error) {
var htpasswdFiles []File
for _, file := range filenames {
htpasswdFiles = append(htpasswdFiles, File{name: file})
}
a := &Auth{
filenames: htpasswdFiles,
}
return a, a.parse()
}
func (a *Auth) parse() error {
tmpUserHash := map[string]string{}
tmpFilenames := a.filenames
for i, filename := range a.filenames {
r, err := os.Open(filename.name)
if err != nil {
return err
}
defer r.Close()
fileInfo, err := os.Stat(filename.name)
if err != nil {
return err
}
tmpFilenames[i].modTime = fileInfo.ModTime()
cr := csv.NewReader(r)
cr.Comma = ':'
cr.Comment = '#'
cr.TrimLeadingSpace = true
for {
record, err := cr.Read()
if err == io.EOF {
break
}
if err != nil {
return err
}
if len(record) != 2 {
return fmt.Errorf("password file in wrong format (%v)", filename)
}
if _, exist := tmpUserHash[record[0]]; exist {
logging.Logger.Warnf("Found duplicate entry for user: (%v)", record[0])
}
tmpUserHash[record[0]] = record[1]
}
}
a.muUserHash.Lock()
a.userHash = tmpUserHash
a.filenames = tmpFilenames
a.muUserHash.Unlock()
return nil
}
// Authenticate the user
func (a *Auth) Authenticate(username, password string) (bool, error) {
reloadIfChanged(a)
a.muUserHash.RLock()
defer a.muUserHash.RUnlock()
if hash, exist := a.userHash[username]; exist {
h := []byte(hash)
p := []byte(password)
if strings.HasPrefix(hash, "$2y$") || strings.HasPrefix(hash, "$2b$") || strings.HasPrefix(hash, "$2a$") {
matchErr := bcrypt.CompareHashAndPassword(h, p)
return (matchErr == nil), nil
}
if strings.HasPrefix(hash, "{SHA}") {
return compareSha(h, p), nil
}
if strings.HasPrefix(hash, "$apr1$") {
return compareMD5(h, p), nil
}
return false, fmt.Errorf("unknown algorithm for user %q", username)
}
return false, nil
}
// Reload htpasswd file if it changed during current run
func reloadIfChanged(a *Auth) {
for _, file := range a.filenames {
fileInfo, err := os.Stat(file.name)
if err != nil {
//On error, retain current file
break
}
currentmodTime := fileInfo.ModTime()
if currentmodTime != file.modTime {
a.parse()
return
}
}
}
func compareSha(hashedPassword, password []byte) bool {
d := sha1.New()
d.Write(password)
return 1 == subtle.ConstantTimeCompare(hashedPassword[5:], []byte(base64.StdEncoding.EncodeToString(d.Sum(nil))))
}
func compareMD5(hashedPassword, password []byte) bool {
parts := bytes.SplitN(hashedPassword, []byte("$"), 4)
if len(parts) != 4 {
return false
}
magic := []byte("$" + string(parts[1]) + "$")
salt := parts[2]
return 1 == subtle.ConstantTimeCompare(hashedPassword, auth.MD5Crypt(password, salt, magic))
}