Improve password hash handling
This adds support for more hash algorithms. Also a stored password will be updated to SSHA512 upon a successful bind. It will also automatically hash a cleartext password if the `userpassword` field is modified with a cleartext one. Hashes supported: * SSHA * SSHA256 * SSHA512pull/14/head
Simon Beck
2 years ago
parent
dbd9003714
commit
f05e41c9aa
@ -1,59 +1,53 @@
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package main
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import (
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"bytes"
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"crypto/rand"
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"crypto/sha1"
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"encoding/base64"
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"fmt"
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"strings"
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log "github.com/sirupsen/logrus"
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"errors"
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"github.com/jsimonetti/pwscheme/ssha"
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"github.com/jsimonetti/pwscheme/ssha256"
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"github.com/jsimonetti/pwscheme/ssha512"
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)
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// Encode encodes the []byte of raw password
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func SSHAEncode(rawPassPhrase []byte) string {
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hash := makeSSHAHash(rawPassPhrase, makeSalt())
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b64 := base64.StdEncoding.EncodeToString(hash)
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return fmt.Sprintf("{ssha}%s", b64)
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}
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const (
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SSHA = "{SSHA}"
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SSHA256 = "{SSHA256}"
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SSHA512 = "{SSHA512}"
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)
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// Matches matches the encoded password and the raw password
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func SSHAMatches(encodedPassPhrase string, rawPassPhrase []byte) bool {
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if !strings.EqualFold(encodedPassPhrase[:6], "{ssha}") {
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return false
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// Encode encodes the string to ssha512
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func SSHAEncode(rawPassPhrase string) (string, error) {
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return ssha512.Generate(rawPassPhrase, 16)
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}
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bhash, err := base64.StdEncoding.DecodeString(encodedPassPhrase[6:])
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// Matches matches the encoded password and the raw password
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func SSHAMatches(encodedPassPhrase string, rawPassPhrase string) (bool, error) {
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hashType, err := determineHashType(encodedPassPhrase)
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if err != nil {
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return false
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return false, errors.New("invalid password hash stored")
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}
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salt := bhash[20:]
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newssha := makeSSHAHash(rawPassPhrase, salt)
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if bytes.Compare(newssha, bhash) != 0 {
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return false
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switch hashType {
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case SSHA:
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return ssha.Validate(rawPassPhrase, encodedPassPhrase)
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case SSHA256:
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return ssha256.Validate(rawPassPhrase, encodedPassPhrase)
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case SSHA512:
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return ssha512.Validate(rawPassPhrase, encodedPassPhrase)
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}
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return true
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return false, errors.New("no matching hash type found")
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}
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// makeSalt make a 32 byte array containing random bytes.
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func makeSalt() []byte {
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sbytes := make([]byte, 32)
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_, err := rand.Read(sbytes)
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if err != nil {
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log.Panicf("Could not read random bytes: %s", err)
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func determineHashType(hash string) (string, error) {
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if len(hash) >= 7 && string(hash[0:6]) == SSHA {
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return SSHA, nil
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}
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return sbytes
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if len(hash) >= 10 && string(hash[0:9]) == SSHA256 {
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return SSHA256, nil
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}
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if len(hash) >= 10 && string(hash[0:9]) == SSHA512 {
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return SSHA512, nil
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}
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// makeSSHAHash make hasing using SHA-1 with salt. This is not the final output though. You need to append {SSHA} string with base64 of this hash.
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func makeSSHAHash(passphrase, salt []byte) []byte {
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sha := sha1.New()
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sha.Write(passphrase)
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sha.Write(salt)
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h := sha.Sum(nil)
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return append(h, salt...)
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return "", errors.New("no valid hash found")
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}
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