Support webauthn (#17957)

Migrate from U2F to Webauthn

Co-authored-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

models/migrations/migrations.go

@@ -366,6 +366,8 @@ var migrations = []Migration{
 	NewMigration("Migrate to higher varchar on user struct", migrateUserPasswordSalt),
 	// v206 -> v207
 	NewMigration("Add authorize column to team_unit table", addAuthorizeColForTeamUnit),
+	// v207 -> v208
+	NewMigration("Add webauthn table and migrate u2f data to webauthn", addWebAuthnCred),
 }
 
 // GetCurrentDBVersion returns the current db version

models/migrations/v207.go

@@ -0,0 +1,91 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package migrations
+
+import (
+	"crypto/elliptic"
+	"encoding/base64"
+	"strings"
+
+	"code.gitea.io/gitea/modules/timeutil"
+
+	"github.com/tstranex/u2f"
+	"xorm.io/xorm"
+)
+
+func addWebAuthnCred(x *xorm.Engine) error {
+
+	// Create webauthnCredential table
+	type webauthnCredential struct {
+		ID              int64 `xorm:"pk autoincr"`
+		Name            string
+		LowerName       string `xorm:"unique(s)"`
+		UserID          int64  `xorm:"INDEX unique(s)"`
+		CredentialID    string `xorm:"INDEX"`
+		PublicKey       []byte
+		AttestationType string
+		AAGUID          []byte
+		SignCount       uint32 `xorm:"BIGINT"`
+		CloneWarning    bool
+		CreatedUnix     timeutil.TimeStamp `xorm:"INDEX created"`
+		UpdatedUnix     timeutil.TimeStamp `xorm:"INDEX updated"`
+	}
+	if err := x.Sync2(&webauthnCredential{}); err != nil {
+		return err
+	}
+
+	// Now migrate the old u2f registrations to the new format
+	type u2fRegistration struct {
+		ID          int64 `xorm:"pk autoincr"`
+		Name        string
+		UserID      int64 `xorm:"INDEX"`
+		Raw         []byte
+		Counter     uint32             `xorm:"BIGINT"`
+		CreatedUnix timeutil.TimeStamp `xorm:"INDEX created"`
+		UpdatedUnix timeutil.TimeStamp `xorm:"INDEX updated"`
+	}
+
+	var start int
+	regs := make([]*u2fRegistration, 0, 50)
+	for {
+		err := x.OrderBy("id").Limit(50, start).Find(&regs)
+		if err != nil {
+			return err
+		}
+
+		for _, reg := range regs {
+			parsed := new(u2f.Registration)
+			err = parsed.UnmarshalBinary(reg.Raw)
+			if err != nil {
+				continue
+			}
+
+			c := &webauthnCredential{
+				ID:              reg.ID,
+				Name:            reg.Name,
+				LowerName:       strings.ToLower(reg.Name),
+				UserID:          reg.UserID,
+				CredentialID:    base64.RawStdEncoding.EncodeToString(parsed.KeyHandle),
+				PublicKey:       elliptic.Marshal(elliptic.P256(), parsed.PubKey.X, parsed.PubKey.Y),
+				AttestationType: "fido-u2f",
+				AAGUID:          []byte{},
+				SignCount:       reg.Counter,
+			}
+
+			_, err := x.Insert(c)
+			if err != nil {
+				return err
+			}
+		}
+
+		if len(regs) < 50 {
+			break
+		}
+		start += 50
+		regs = regs[:0]
+	}
+
+	return nil
+}