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htpasswd.go
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htpasswd.go
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package htpasswd
import (
"bufio"
"crypto/sha1"
"encoding/base64"
"errors"
"fmt"
"os"
"strings"
"github.com/GoogleCloudPlatform/kubernetes/pkg/auth/user"
"github.com/golang/glog"
authapi "github.com/openshift/origin/pkg/auth/api"
"github.com/openshift/origin/pkg/auth/authenticator"
)
// Authenticator watches a file generated by htpasswd to validate usernames and passwords
type Authenticator struct {
providerName string
file string
fileInfo os.FileInfo
mapper authapi.UserIdentityMapper
usernames map[string]string
}
// New returns an authenticator which will validate usernames and passwords against the given htpasswd file
func New(providerName string, file string, mapper authapi.UserIdentityMapper) (authenticator.Password, error) {
auth := &Authenticator{
providerName: providerName,
file: file,
mapper: mapper,
}
if err := auth.loadIfNeeded(); err != nil {
return nil, err
}
return auth, nil
}
func (a *Authenticator) AuthenticatePassword(username, password string) (user.Info, bool, error) {
a.loadIfNeeded()
if len(username) > 255 {
username = username[:255]
}
if strings.Contains(username, ":") {
return nil, false, errors.New("Usernames may not contain : characters")
}
hash, ok := a.usernames[username]
if !ok {
return nil, false, nil
}
if ok, err := testPassword(password, hash); !ok || err != nil {
return nil, false, err
}
identity := authapi.NewDefaultUserIdentityInfo(a.providerName, username)
user, err := a.mapper.UserFor(identity)
glog.V(4).Infof("Got userIdentityMapping: %#v", user)
if err != nil {
return nil, false, fmt.Errorf("Error creating or updating mapping for: %#v due to %v", identity, err)
}
return user, true, nil
}
func (a *Authenticator) load() error {
file, err := os.Open(a.file)
if err != nil {
return err
}
defer file.Close()
newusernames := map[string]string{}
warnedusernames := map[string]bool{}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := scanner.Text()
if len(line) == 0 {
continue
}
parts := strings.SplitN(line, ":", 2)
if len(parts) != 2 {
glog.Warningf("Ignoring malformed htpasswd line: %s", line)
continue
}
username := parts[0]
password := parts[1]
if _, duplicate := newusernames[username]; duplicate {
if _, warned := warnedusernames[username]; !warned {
warnedusernames[username] = true
glog.Warningf("%s contains multiple passwords for user '%s'. The last one specified will be used.", a.file, username)
}
}
newusernames[username] = password
}
a.usernames = newusernames
return nil
}
func (a *Authenticator) loadIfNeeded() error {
info, err := os.Stat(a.file)
if err != nil {
return err
}
if a.fileInfo == nil || a.fileInfo.ModTime() != info.ModTime() {
glog.V(4).Infof("Loading htpasswd file %s...", a.file)
a.fileInfo = info
return a.load()
}
return nil
}
func testPassword(password, hash string) (bool, error) {
switch {
case strings.HasPrefix(hash, "$apr1$"):
// MD5, default
return testMD5Password(password, hash)
case strings.HasPrefix(hash, "$2y$") || strings.HasPrefix(hash, "$2a$"):
// Bcrypt, secure
return testBCryptPassword(password, hash)
case strings.HasPrefix(hash, "{SHA}"):
// SHA-1, insecure
return testSHAPassword(password, hash[5:])
case len(hash) == 13:
// looks like crypt
return testCryptPassword(password, hash)
default:
return false, errors.New("Unrecognized hash type")
}
}
func testSHAPassword(password, hash string) (bool, error) {
if len(hash) == 0 {
return false, errors.New("Invalid SHA hash")
}
// Compute hash of password
shasum := sha1.Sum([]byte(password))
// Base-64 encode
base64shasum := base64.StdEncoding.EncodeToString(shasum[:])
// Compare
match := hash == base64shasum
return match, nil
}
func testBCryptPassword(password, hash string) (bool, error) {
// TODO: import bcrypt
// err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
// if err == bcrypt.ErrMismatchedHashAndPassword {
// return false, nil
// }
// if err != nil {
// return false, err
// }
// return true, nil
return false, errors.New("bcrypt password hashes are not supported")
}
func testMD5Password(password, hash string) (bool, error) {
parts := strings.Split(hash, "$")
if len(parts) != 4 {
return false, errors.New("Malformed MD5 hash")
}
salt := parts[2]
if len(salt) == 0 {
return false, errors.New("Malformed MD5 hash: missing salt")
}
if len(salt) > 8 {
salt = salt[:8]
}
md5hash := parts[3]
if len(md5hash) == 0 {
return false, errors.New("Malformed MD5 hash: missing hash")
}
testhash := string(aprMD5([]byte(password), []byte(salt)))
match := testhash == hash
return match, nil
}
func testCryptPassword(password, hash string) (bool, error) {
// if len(password) > 8 {
// password = password[:8]
// }
// salt := hash[0:2]
// hash = hash[2:]
return false, errors.New("crypt password hashes are not supported")
}