Change EncodePasswd to HashPassword (#3329)

* Change EncodePasswd to HashPassword

* Create test+benchmark for HashPassword

2 files changed, 43 insertions, 4 deletions

diff --git a/models/user.go b/models/user.go
index 3839e14590..c30c66d6c3 100644
--- a/models/user.go
+++ b/models/user.go
@@ -388,8 +388,8 @@ func (u *User) NewGitSig() *git.Signature {
 	}
 }
 
-// EncodePasswd encodes password to safe format.
-func (u *User) EncodePasswd() {
+// HashPassword hashes a password using PBKDF.
+func (u *User) HashPassword() {
 	newPasswd := pbkdf2.Key([]byte(u.Passwd), []byte(u.Salt), 10000, 50, sha256.New)
 	u.Passwd = fmt.Sprintf("%x", newPasswd)
 }
@@ -397,7 +397,7 @@ func (u *User) EncodePasswd() {
 // ValidatePassword checks if given password matches the one belongs to the user.
 func (u *User) ValidatePassword(passwd string) bool {
 	newUser := &User{Passwd: passwd, Salt: u.Salt}
-	newUser.EncodePasswd()
+	newUser.HashPassword()
 	return subtle.ConstantTimeCompare([]byte(u.Passwd), []byte(newUser.Passwd)) == 1
 }
 
@@ -711,7 +711,7 @@ func CreateUser(u *User) (err error) {
 	if u.Salt, err = GetUserSalt(); err != nil {
 		return err
 	}
-	u.EncodePasswd()
+	u.HashPassword()
 	u.AllowCreateOrganization = setting.Service.DefaultAllowCreateOrganization
 	u.MaxRepoCreation = -1
 
diff --git a/models/user_test.go b/models/user_test.go
index 03ab54aaf7..c0b7dace7f 100644
--- a/models/user_test.go
+++ b/models/user_test.go
@@ -5,6 +5,7 @@
 package models
 
 import (
+	"math/rand"
 	"testing"
 
 	"code.gitea.io/gitea/modules/setting"
@@ -123,3 +124,41 @@ func TestDeleteUser(t *testing.T) {
 	test(8)
 	test(11)
 }
+
+func TestHashPasswordDeterministic(t *testing.T) {
+	b := make([]byte, 16)
+	rand.Read(b)
+	u := &User{Salt: string(b)}
+	for i := 0; i < 50; i++ {
+		// generate a random password
+		rand.Read(b)
+		pass := string(b)
+
+		// save the current password in the user - hash it and store the result
+		u.Passwd = pass
+		u.HashPassword()
+		r1 := u.Passwd
+
+		// run again
+		u.Passwd = pass
+		u.HashPassword()
+		r2 := u.Passwd
+
+		// assert equal (given the same salt+pass, the same result is produced)
+		assert.Equal(t, r1, r2)
+	}
+}
+
+func BenchmarkHashPassword(b *testing.B) {
+	// BenchmarkHashPassword ensures that it takes a reasonable amount of time
+	// to hash a password - in order to protect from brute-force attacks.
+	pass := "password1337"
+	bs := make([]byte, 16)
+	rand.Read(bs)
+	u := &User{Salt: string(bs), Passwd: pass}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		u.HashPassword()
+		u.Passwd = pass
+	}
+}