Add support for FIDO U2F (#3971)
* Add support for U2F Signed-off-by: Jonas Franz <info@jonasfranz.software> * Add vendor library Add missing translations Signed-off-by: Jonas Franz <info@jonasfranz.software> * Minor improvements Signed-off-by: Jonas Franz <info@jonasfranz.software> * Add U2F support for Firefox, Chrome (Android) by introducing a custom JS library Add U2F error handling Signed-off-by: Jonas Franz <info@jonasfranz.software> * Add U2F login page to OAuth Signed-off-by: Jonas Franz <info@jonasfranz.software> * Move U2F user settings to a separate file Signed-off-by: Jonas Franz <info@jonasfranz.software> * Add unit tests for u2f model Renamed u2f table name Signed-off-by: Jonas Franz <info@jonasfranz.software> * Fix problems caused by refactoring Signed-off-by: Jonas Franz <info@jonasfranz.software> * Add U2F documentation Signed-off-by: Jonas Franz <info@jonasfranz.software> * Remove not needed console.log-s Signed-off-by: Jonas Franz <info@jonasfranz.software> * Add default values to app.ini.sample Add FIDO U2F to comparison Signed-off-by: Jonas Franz <info@jonasfranz.software>tokarchuk/v1.17
Jonas Franz
7 years ago
committed by
Lauris BH
parent
f933bcdfee
commit
951309f76a
@ -0,0 +1,7 @@ |
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- |
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id: 1 |
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name: "U2F Key" |
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user_id: 1 |
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counter: 0 |
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created_unix: 946684800 |
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updated_unix: 946684800 |
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@ -0,0 +1,19 @@ |
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package migrations |
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import ( |
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"code.gitea.io/gitea/modules/util" |
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"github.com/go-xorm/xorm" |
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) |
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func addU2FReg(x *xorm.Engine) error { |
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type U2FRegistration struct { |
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ID int64 `xorm:"pk autoincr"` |
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Name string |
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UserID int64 `xorm:"INDEX"` |
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Raw []byte |
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Counter uint32 |
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CreatedUnix util.TimeStamp `xorm:"INDEX created"` |
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UpdatedUnix util.TimeStamp `xorm:"INDEX updated"` |
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} |
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return x.Sync2(&U2FRegistration{}) |
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} |
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@ -0,0 +1,120 @@ |
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// Copyright 2018 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package models |
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import ( |
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"code.gitea.io/gitea/modules/log" |
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"code.gitea.io/gitea/modules/util" |
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"github.com/tstranex/u2f" |
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) |
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// U2FRegistration represents the registration data and counter of a security key
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type U2FRegistration struct { |
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ID int64 `xorm:"pk autoincr"` |
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Name string |
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UserID int64 `xorm:"INDEX"` |
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Raw []byte |
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Counter uint32 |
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CreatedUnix util.TimeStamp `xorm:"INDEX created"` |
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UpdatedUnix util.TimeStamp `xorm:"INDEX updated"` |
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} |
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// TableName returns a better table name for U2FRegistration
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func (reg U2FRegistration) TableName() string { |
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return "u2f_registration" |
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} |
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|
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// Parse will convert the db entry U2FRegistration to an u2f.Registration struct
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func (reg *U2FRegistration) Parse() (*u2f.Registration, error) { |
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r := new(u2f.Registration) |
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return r, r.UnmarshalBinary(reg.Raw) |
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} |
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func (reg *U2FRegistration) updateCounter(e Engine) error { |
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_, err := e.ID(reg.ID).Cols("counter").Update(reg) |
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return err |
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} |
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|
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// UpdateCounter will update the database value of counter
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func (reg *U2FRegistration) UpdateCounter() error { |
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return reg.updateCounter(x) |
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} |
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// U2FRegistrationList is a list of *U2FRegistration
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type U2FRegistrationList []*U2FRegistration |
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// ToRegistrations will convert all U2FRegistrations to u2f.Registrations
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func (list U2FRegistrationList) ToRegistrations() []u2f.Registration { |
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regs := make([]u2f.Registration, len(list)) |
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for _, reg := range list { |
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r, err := reg.Parse() |
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if err != nil { |
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log.Fatal(4, "parsing u2f registration: %v", err) |
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continue |
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} |
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regs = append(regs, *r) |
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} |
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return regs |
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} |
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func getU2FRegistrationsByUID(e Engine, uid int64) (U2FRegistrationList, error) { |
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regs := make(U2FRegistrationList, 0) |
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return regs, e.Where("user_id = ?", uid).Find(®s) |
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} |
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// GetU2FRegistrationByID returns U2F registration by id
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func GetU2FRegistrationByID(id int64) (*U2FRegistration, error) { |
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return getU2FRegistrationByID(x, id) |
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} |
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func getU2FRegistrationByID(e Engine, id int64) (*U2FRegistration, error) { |
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reg := new(U2FRegistration) |
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if found, err := e.ID(id).Get(reg); err != nil { |
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return nil, err |
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} else if !found { |
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return nil, ErrU2FRegistrationNotExist{ID: id} |
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} |
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return reg, nil |
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} |
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// GetU2FRegistrationsByUID returns all U2F registrations of the given user
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func GetU2FRegistrationsByUID(uid int64) (U2FRegistrationList, error) { |
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return getU2FRegistrationsByUID(x, uid) |
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} |
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func createRegistration(e Engine, user *User, name string, reg *u2f.Registration) (*U2FRegistration, error) { |
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raw, err := reg.MarshalBinary() |
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if err != nil { |
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return nil, err |
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} |
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r := &U2FRegistration{ |
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UserID: user.ID, |
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Name: name, |
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Counter: 0, |
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Raw: raw, |
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} |
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_, err = e.InsertOne(r) |
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if err != nil { |
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return nil, err |
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} |
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return r, nil |
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} |
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// CreateRegistration will create a new U2FRegistration from the given Registration
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func CreateRegistration(user *User, name string, reg *u2f.Registration) (*U2FRegistration, error) { |
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return createRegistration(x, user, name, reg) |
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} |
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// DeleteRegistration will delete U2FRegistration
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func DeleteRegistration(reg *U2FRegistration) error { |
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return deleteRegistration(x, reg) |
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} |
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func deleteRegistration(e Engine, reg *U2FRegistration) error { |
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_, err := e.Delete(reg) |
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return err |
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} |
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@ -0,0 +1,61 @@ |
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package models |
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import ( |
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"testing" |
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"github.com/stretchr/testify/assert" |
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"github.com/tstranex/u2f" |
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) |
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func TestGetU2FRegistrationByID(t *testing.T) { |
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assert.NoError(t, PrepareTestDatabase()) |
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res, err := GetU2FRegistrationByID(1) |
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assert.NoError(t, err) |
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assert.Equal(t, "U2F Key", res.Name) |
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_, err = GetU2FRegistrationByID(342432) |
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assert.Error(t, err) |
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assert.True(t, IsErrU2FRegistrationNotExist(err)) |
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} |
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func TestGetU2FRegistrationsByUID(t *testing.T) { |
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assert.NoError(t, PrepareTestDatabase()) |
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res, err := GetU2FRegistrationsByUID(1) |
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assert.NoError(t, err) |
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assert.Len(t, res, 1) |
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assert.Equal(t, "U2F Key", res[0].Name) |
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} |
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func TestU2FRegistration_TableName(t *testing.T) { |
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assert.Equal(t, "u2f_registration", U2FRegistration{}.TableName()) |
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} |
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func TestU2FRegistration_UpdateCounter(t *testing.T) { |
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assert.NoError(t, PrepareTestDatabase()) |
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reg := AssertExistsAndLoadBean(t, &U2FRegistration{ID: 1}).(*U2FRegistration) |
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reg.Counter = 1 |
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assert.NoError(t, reg.UpdateCounter()) |
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AssertExistsIf(t, true, &U2FRegistration{ID: 1, Counter: 1}) |
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} |
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func TestCreateRegistration(t *testing.T) { |
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assert.NoError(t, PrepareTestDatabase()) |
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user := AssertExistsAndLoadBean(t, &User{ID: 1}).(*User) |
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res, err := CreateRegistration(user, "U2F Created Key", &u2f.Registration{Raw: []byte("Test")}) |
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assert.NoError(t, err) |
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assert.Equal(t, "U2F Created Key", res.Name) |
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assert.Equal(t, []byte("Test"), res.Raw) |
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AssertExistsIf(t, true, &U2FRegistration{Name: "U2F Created Key", UserID: user.ID}) |
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} |
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func TestDeleteRegistration(t *testing.T) { |
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assert.NoError(t, PrepareTestDatabase()) |
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reg := AssertExistsAndLoadBean(t, &U2FRegistration{ID: 1}).(*U2FRegistration) |
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assert.NoError(t, DeleteRegistration(reg)) |
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AssertNotExistsBean(t, &U2FRegistration{ID: 1}) |
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} |
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File diff suppressed because one or more lines are too long
@ -0,0 +1,99 @@ |
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// Copyright 2018 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package setting |
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import ( |
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"errors" |
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"code.gitea.io/gitea/models" |
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"code.gitea.io/gitea/modules/auth" |
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"code.gitea.io/gitea/modules/context" |
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"code.gitea.io/gitea/modules/setting" |
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"github.com/tstranex/u2f" |
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) |
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// U2FRegister initializes the u2f registration procedure
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func U2FRegister(ctx *context.Context, form auth.U2FRegistrationForm) { |
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if form.Name == "" { |
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ctx.Error(409) |
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return |
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} |
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challenge, err := u2f.NewChallenge(setting.U2F.AppID, setting.U2F.TrustedFacets) |
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if err != nil { |
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ctx.ServerError("NewChallenge", err) |
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return |
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} |
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err = ctx.Session.Set("u2fChallenge", challenge) |
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if err != nil { |
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ctx.ServerError("Session.Set", err) |
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return |
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} |
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regs, err := models.GetU2FRegistrationsByUID(ctx.User.ID) |
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if err != nil { |
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ctx.ServerError("GetU2FRegistrationsByUID", err) |
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return |
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} |
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for _, reg := range regs { |
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if reg.Name == form.Name { |
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ctx.Error(409, "Name already taken") |
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return |
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} |
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} |
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ctx.Session.Set("u2fName", form.Name) |
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ctx.JSON(200, u2f.NewWebRegisterRequest(challenge, regs.ToRegistrations())) |
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} |
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// U2FRegisterPost receives the response of the security key
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func U2FRegisterPost(ctx *context.Context, response u2f.RegisterResponse) { |
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challSess := ctx.Session.Get("u2fChallenge") |
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u2fName := ctx.Session.Get("u2fName") |
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if challSess == nil || u2fName == nil { |
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ctx.ServerError("U2FRegisterPost", errors.New("not in U2F session")) |
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return |
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} |
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challenge := challSess.(*u2f.Challenge) |
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name := u2fName.(string) |
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config := &u2f.Config{ |
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// Chrome 66+ doesn't return the device's attestation
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// certificate by default.
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SkipAttestationVerify: true, |
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} |
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reg, err := u2f.Register(response, *challenge, config) |
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if err != nil { |
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ctx.ServerError("u2f.Register", err) |
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return |
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} |
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if _, err = models.CreateRegistration(ctx.User, name, reg); err != nil { |
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ctx.ServerError("u2f.Register", err) |
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return |
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} |
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ctx.Status(200) |
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} |
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// U2FDelete deletes an security key by id
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func U2FDelete(ctx *context.Context, form auth.U2FDeleteForm) { |
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reg, err := models.GetU2FRegistrationByID(form.ID) |
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if err != nil { |
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if models.IsErrU2FRegistrationNotExist(err) { |
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ctx.Status(200) |
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return |
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} |
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ctx.ServerError("GetU2FRegistrationByID", err) |
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return |
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} |
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if reg.UserID != ctx.User.ID { |
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ctx.Status(401) |
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return |
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} |
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if err := models.DeleteRegistration(reg); err != nil { |
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ctx.ServerError("DeleteRegistration", err) |
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return |
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} |
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ctx.JSON(200, map[string]interface{}{ |
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"redirect": setting.AppSubURL + "/user/settings/security", |
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}) |
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return |
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} |
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@ -0,0 +1,22 @@ |
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{{template "base/head" .}} |
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<div class="user signin"> |
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<div class="ui middle centered very relaxed page grid"> |
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<div class="column"> |
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<h3 class="ui top attached header"> |
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{{.i18n.Tr "twofa"}} |
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</h3> |
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<div class="ui attached segment"> |
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<i class="huge key icon"></i> |
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<h3>{{.i18n.Tr "u2f_insert_key"}}</h3> |
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{{template "base/alert" .}} |
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<p>{{.i18n.Tr "u2f_sign_in"}}</p> |
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</div> |
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<div id="wait-for-key" class="ui attached segment"><div class="ui active indeterminate inline loader"></div> {{.i18n.Tr "u2f_press_button"}} </div> |
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<div class="ui attached segment"> |
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<a href="/user/two_factor">{{.i18n.Tr "u2f_use_twofa"}}</a> |
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</div> |
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</div> |
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</div> |
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</div> |
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{{template "user/auth/u2f_error" .}} |
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{{template "base/footer" .}} |
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@ -0,0 +1,32 @@ |
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<div class="ui small modal" id="u2f-error"> |
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<div class="header">{{.i18n.Tr "u2f_error"}}</div> |
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<div class="content"> |
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<div class="ui negative message"> |
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<div class="header"> |
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{{.i18n.Tr "u2f_error"}} |
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</div> |
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<div class="hide" id="unsupported-browser"> |
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{{.i18n.Tr "u2f_unsupported_browser"}} |
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</div> |
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<div class="hide" id="u2f-error-1"> |
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{{.i18n.Tr "u2f_error_1"}} |
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</div> |
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<div class="hide" id="u2f-error-2"> |
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{{.i18n.Tr "u2f_error_2"}} |
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</div> |
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<div class="hide" id="u2f-error-3"> |
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{{.i18n.Tr "u2f_error_3"}} |
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</div> |
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<div class="hide" id="u2f-error-4"> |
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{{.i18n.Tr "u2f_error_4"}} |
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</div> |
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<div class="hide u2f-error-5"> |
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{{.i18n.Tr "u2f_error_5"}} |
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</div> |
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</div> |
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</div> |
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<div class="actions"> |
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<button onclick="window.location.reload()" class="success ui button hide u2f_error_5">{{.i18n.Tr "u2f_reload"}}</button> |
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<div class="ui cancel button">{{.i18n.Tr "cancel"}}</div> |
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</div> |
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</div> |
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@ -0,0 +1,56 @@ |
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<h4 class="ui top attached header"> |
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{{.i18n.Tr "settings.u2f"}} |
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</h4> |
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<div class="ui attached segment"> |
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<p>{{.i18n.Tr "settings.u2f_desc" | Str2html}}</p> |
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{{if .TwofaEnrolled}} |
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<div class="ui key list"> |
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{{range .U2FRegistrations}} |
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<div class="item"> |
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<div class="right floated content"> |
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<button class="ui red tiny button delete-button" id="delete-registration" data-url="{{$.Link}}/u2f/delete" data-id="{{.ID}}"> |
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{{$.i18n.Tr "settings.delete_key"}} |
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</button> |
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</div> |
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<div class="content"> |
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<strong>{{.Name}}</strong> |
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</div> |
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</div> |
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{{end}} |
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</div> |
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<div class="ui form"> |
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{{.CsrfTokenHtml}} |
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<div class="required field"> |
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<label for="nickname">{{.i18n.Tr "settings.u2f_nickname"}}</label> |
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<input id="nickname" name="nickname" type="text" required> |
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</div> |
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<button id="register-security-key" class="positive ui labeled icon button"><i class="usb icon"></i>{{.i18n.Tr "settings.u2f_register_key"}}</button> |
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</div> |
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{{else}} |
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<b>{{.i18n.Tr "settings.u2f_require_twofa"}}</b> |
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{{end}} |
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</div> |
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<div class="ui small modal" id="register-device"> |
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<div class="header">{{.i18n.Tr "settings.u2f_register_key"}}</div> |
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<div class="content"> |
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<i class="notched spinner loading icon"></i> {{.i18n.Tr "settings.u2f_press_button"}} |
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</div> |
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<div class="actions"> |
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<div class="ui cancel button">{{.i18n.Tr "cancel"}}</div> |
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</div> |
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</div> |
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|
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{{template "user/auth/u2f_error" .}} |
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<div class="ui small basic delete modal" id="delete-registration"> |
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<div class="ui icon header"> |
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<i class="trash icon"></i> |
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{{.i18n.Tr "settings.u2f_delete_key"}} |
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</div> |
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<div class="content"> |
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<p>{{.i18n.Tr "settings.u2f_delete_key_desc"}}</p> |
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</div> |
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{{template "base/delete_modal_actions" .}} |
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</div> |
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@ -0,0 +1,21 @@ |
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The MIT License (MIT) |
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|
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Copyright (c) 2015 The Go FIDO U2F Library Authors |
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|
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Permission is hereby granted, free of charge, to any person obtaining a copy |
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of this software and associated documentation files (the "Software"), to deal |
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in the Software without restriction, including without limitation the rights |
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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copies of the Software, and to permit persons to whom the Software is |
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furnished to do so, subject to the following conditions: |
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|
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The above copyright notice and this permission notice shall be included in |
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all copies or substantial portions of the Software. |
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|
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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THE SOFTWARE. |
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@ -0,0 +1,97 @@ |
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# Go FIDO U2F Library |
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|
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This Go package implements the parts of the FIDO U2F specification required on |
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the server side of an application. |
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|
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[](https://travis-ci.org/tstranex/u2f) |
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## Features |
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- Native Go implementation |
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- No dependancies other than the Go standard library |
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- Token attestation certificate verification |
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## Usage |
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|
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Please visit http://godoc.org/github.com/tstranex/u2f for the full |
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documentation. |
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### How to enrol a new token |
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```go |
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app_id := "http://localhost" |
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// Send registration request to the browser. |
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c, _ := NewChallenge(app_id, []string{app_id}) |
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req, _ := c.RegisterRequest() |
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// Read response from the browser. |
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var resp RegisterResponse |
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reg, err := Register(resp, c, nil) |
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if err != nil { |
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// Registration failed. |
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} |
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// Store registration in the database. |
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``` |
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### How to perform an authentication |
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|
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```go |
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// Fetch registration and counter from the database. |
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var reg Registration |
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var counter uint32 |
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|
||||
// Send authentication request to the browser. |
||||
c, _ := NewChallenge(app_id, []string{app_id}) |
||||
req, _ := c.SignRequest(reg) |
||||
|
||||
// Read response from the browser. |
||||
var resp SignResponse |
||||
newCounter, err := reg.Authenticate(resp, c, counter) |
||||
if err != nil { |
||||
// Authentication failed. |
||||
} |
||||
|
||||
// Store updated counter in the database. |
||||
``` |
||||
|
||||
## Installation |
||||
|
||||
``` |
||||
$ go get github.com/tstranex/u2f |
||||
``` |
||||
|
||||
## Example |
||||
|
||||
See u2fdemo/main.go for an full example server. To run it: |
||||
|
||||
``` |
||||
$ go install github.com/tstranex/u2f/u2fdemo |
||||
$ ./bin/u2fdemo |
||||
``` |
||||
|
||||
Open https://localhost:3483 in Chrome. |
||||
Ignore the SSL warning (due to the self-signed certificate for localhost). |
||||
You can then test registering and authenticating using your token. |
||||
|
||||
## Changelog |
||||
|
||||
- 2016-12-18: The package has been updated to work with the new |
||||
U2F Javascript 1.1 API specification. This causes some breaking changes. |
||||
|
||||
`SignRequest` has been replaced by `WebSignRequest` which now includes |
||||
multiple registrations. This is useful when the user has multiple devices |
||||
registered since you can now authenticate against any of them with a single |
||||
request. |
||||
|
||||
`WebRegisterRequest` has been introduced, which should generally be used |
||||
instead of using `RegisterRequest` directly. It includes the list of existing |
||||
registrations with the new registration request. If the user's device already |
||||
matches one of the existing registrations, it will refuse to re-register. |
||||
|
||||
`Challenge.RegisterRequest` has been replaced by `NewWebRegisterRequest`. |
||||
|
||||
## License |
||||
|
||||
The Go FIDO U2F Library is licensed under the MIT License. |
||||
@ -0,0 +1,136 @@ |
||||
// Go FIDO U2F Library
|
||||
// Copyright 2015 The Go FIDO U2F Library Authors. All rights reserved.
|
||||
// Use of this source code is governed by the MIT
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package u2f |
||||
|
||||
import ( |
||||
"crypto/ecdsa" |
||||
"crypto/sha256" |
||||
"encoding/asn1" |
||||
"errors" |
||||
"math/big" |
||||
"time" |
||||
) |
||||
|
||||
// SignRequest creates a request to initiate an authentication.
|
||||
func (c *Challenge) SignRequest(regs []Registration) *WebSignRequest { |
||||
var sr WebSignRequest |
||||
sr.AppID = c.AppID |
||||
sr.Challenge = encodeBase64(c.Challenge) |
||||
for _, r := range regs { |
||||
rk := getRegisteredKey(c.AppID, r) |
||||
sr.RegisteredKeys = append(sr.RegisteredKeys, rk) |
||||
} |
||||
return &sr |
||||
} |
||||
|
||||
// ErrCounterTooLow is raised when the counter value received from the device is
|
||||
// lower than last stored counter value. This may indicate that the device has
|
||||
// been cloned (or is malfunctioning). The application may choose to disable
|
||||
// the particular device as precaution.
|
||||
var ErrCounterTooLow = errors.New("u2f: counter too low") |
||||
|
||||
// Authenticate validates a SignResponse authentication response.
|
||||
// An error is returned if any part of the response fails to validate.
|
||||
// The counter should be the counter associated with appropriate device
|
||||
// (i.e. resp.KeyHandle).
|
||||
// The latest counter value is returned, which the caller should store.
|
||||
func (reg *Registration) Authenticate(resp SignResponse, c Challenge, counter uint32) (newCounter uint32, err error) { |
||||
if time.Now().Sub(c.Timestamp) > timeout { |
||||
return 0, errors.New("u2f: challenge has expired") |
||||
} |
||||
if resp.KeyHandle != encodeBase64(reg.KeyHandle) { |
||||
return 0, errors.New("u2f: wrong key handle") |
||||
} |
||||
|
||||
sigData, err := decodeBase64(resp.SignatureData) |
||||
if err != nil { |
||||
return 0, err |
||||
} |
||||
|
||||
clientData, err := decodeBase64(resp.ClientData) |
||||
if err != nil { |
||||
return 0, err |
||||
} |
||||
|
||||
ar, err := parseSignResponse(sigData) |
||||
if err != nil { |
||||
return 0, err |
||||
} |
||||
|
||||
if ar.Counter < counter { |
||||
return 0, ErrCounterTooLow |
||||
} |
||||
|
||||
if err := verifyClientData(clientData, c); err != nil { |
||||
return 0, err |
||||
} |
||||
|
||||
if err := verifyAuthSignature(*ar, ®.PubKey, c.AppID, clientData); err != nil { |
||||
return 0, err |
||||
} |
||||
|
||||
if !ar.UserPresenceVerified { |
||||
return 0, errors.New("u2f: user was not present") |
||||
} |
||||
|
||||
return ar.Counter, nil |
||||
} |
||||
|
||||
type ecdsaSig struct { |
||||
R, S *big.Int |
||||
} |
||||
|
||||
type authResp struct { |
||||
UserPresenceVerified bool |
||||
Counter uint32 |
||||
sig ecdsaSig |
||||
raw []byte |
||||
} |
||||
|
||||
func parseSignResponse(sd []byte) (*authResp, error) { |
||||
if len(sd) < 5 { |
||||
return nil, errors.New("u2f: data is too short") |
||||
} |
||||
|
||||
var ar authResp |
||||
|
||||
userPresence := sd[0] |
||||
if userPresence|1 != 1 { |
||||
return nil, errors.New("u2f: invalid user presence byte") |
||||
} |
||||
ar.UserPresenceVerified = userPresence == 1 |
||||
|
||||
ar.Counter = uint32(sd[1])<<24 | uint32(sd[2])<<16 | uint32(sd[3])<<8 | uint32(sd[4]) |
||||
|
||||
ar.raw = sd[:5] |
||||
|
||||
rest, err := asn1.Unmarshal(sd[5:], &ar.sig) |
||||
if err != nil { |
||||
return nil, err |
||||
} |
||||
if len(rest) != 0 { |
||||
return nil, errors.New("u2f: trailing data") |
||||
} |
||||
|
||||
return &ar, nil |
||||
} |
||||
|
||||
func verifyAuthSignature(ar authResp, pubKey *ecdsa.PublicKey, appID string, clientData []byte) error { |
||||
appParam := sha256.Sum256([]byte(appID)) |
||||
challenge := sha256.Sum256(clientData) |
||||
|
||||
var buf []byte |
||||
buf = append(buf, appParam[:]...) |
||||
buf = append(buf, ar.raw...) |
||||
buf = append(buf, challenge[:]...) |
||||
hash := sha256.Sum256(buf) |
||||
|
||||
if !ecdsa.Verify(pubKey, hash[:], ar.sig.R, ar.sig.S) { |
||||
return errors.New("u2f: invalid signature") |
||||
} |
||||
|
||||
return nil |
||||
} |
||||
@ -0,0 +1,89 @@ |
||||
// Go FIDO U2F Library
|
||||
// Copyright 2015 The Go FIDO U2F Library Authors. All rights reserved.
|
||||
// Use of this source code is governed by the MIT
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package u2f |
||||
|
||||
import ( |
||||
"crypto/x509" |
||||
"log" |
||||
) |
||||
|
||||
const plugUpCert = `-----BEGIN CERTIFICATE----- |
||||
MIIBrjCCAVSgAwIBAgIJAMGSvUZlGSGVMAoGCCqGSM49BAMCMDIxMDAuBgNVBAMM |
||||
J1BsdWctdXAgRklETyBJbnRlcm5hbCBBdHRlc3RhdGlvbiBDQSAjMTAeFw0xNDA5 |
||||
MjMxNjM3NTFaFw0zNDA5MjMxNjM3NTFaMDIxMDAuBgNVBAMMJ1BsdWctdXAgRklE |
||||
TyBJbnRlcm5hbCBBdHRlc3RhdGlvbiBDQSAjMTBZMBMGByqGSM49AgEGCCqGSM49 |
||||
AwEHA0IABH9mscDgEHo4AUh7J8JHqRxsSVxbvsbe6Pxy5cUFKfQlWNjxRrZcbhOb |
||||
UY3WsAwmKuUdOcghbpTILhdp8LG9z5GjUzBRMA8GA1UdEwEB/wQFMAMBAf8wHQYD |
||||
VR0OBBYEFM+nRPKhYlDwOemShePaUOd9sDqoMB8GA1UdIwQYMBaAFM+nRPKhYlDw |
||||
OemShePaUOd9sDqoMAoGCCqGSM49BAMCA0gAMEUCIQDVzqnX1rgvyJaZ7WZUm1ED |
||||
hJKSsDxRXEnH+/voqpq/zgIgH4RUR6vr9YNrkzuCq5R07gF7P4qhtg/4jy+dhl7o |
||||
NAU= |
||||
-----END CERTIFICATE----- |
||||
` |
||||
|
||||
const neowaveCert = `-----BEGIN CERTIFICATE----- |
||||
MIICJDCCAcugAwIBAgIJAIo+0R9DGvSBMAoGCCqGSM49BAMCMG8xCzAJBgNVBAYT |
||||
AkZSMQ8wDQYDVQQIDAZGcmFuY2UxETAPBgNVBAcMCEdhcmRhbm5lMRAwDgYDVQQK |
||||
DAdOZW93YXZlMSowKAYDVQQDDCFOZW93YXZlIEtFWURPIEZJRE8gVTJGIENBIEJh |
||||
dGNoIDEwHhcNMTUwMTI4MTA1ODM1WhcNMjUwMTI1MTA1ODM1WjBvMQswCQYDVQQG |
||||
EwJGUjEPMA0GA1UECAwGRnJhbmNlMREwDwYDVQQHDAhHYXJkYW5uZTEQMA4GA1UE |
||||
CgwHTmVvd2F2ZTEqMCgGA1UEAwwhTmVvd2F2ZSBLRVlETyBGSURPIFUyRiBDQSBC |
||||
YXRjaCAxMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEBlUmE1BRE/M/CE/ZCN+x |
||||
eutfnVsThMwIDN+4DL9gqXoKCeRMiDQ1zwm/yQS80BYSEz7Du9RU+2mlnyhwhu+f |
||||
BqNQME4wHQYDVR0OBBYEFF42te8/iq5HGom4sIhgkJWLq5jkMB8GA1UdIwQYMBaA |
||||
FF42te8/iq5HGom4sIhgkJWLq5jkMAwGA1UdEwQFMAMBAf8wCgYIKoZIzj0EAwID |
||||
RwAwRAIgVTxBFb2Hclq5Yi5gQp6WoZAcHETfKASvTQVOE88REGQCIA5DcwGVLsZB |
||||
QTb94Xgtb/WUieCvmwukFl/gEO15f3uA |
||||
-----END CERTIFICATE----- |
||||
` |
||||
|
||||
const yubicoRootCert = `-----BEGIN CERTIFICATE----- |
||||
MIIDHjCCAgagAwIBAgIEG0BT9zANBgkqhkiG9w0BAQsFADAuMSwwKgYDVQQDEyNZ |
||||
dWJpY28gVTJGIFJvb3QgQ0EgU2VyaWFsIDQ1NzIwMDYzMTAgFw0xNDA4MDEwMDAw |
||||
MDBaGA8yMDUwMDkwNDAwMDAwMFowLjEsMCoGA1UEAxMjWXViaWNvIFUyRiBSb290 |
||||
IENBIFNlcmlhbCA0NTcyMDA2MzEwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK |
||||
AoIBAQC/jwYuhBVlqaiYWEMsrWFisgJ+PtM91eSrpI4TK7U53mwCIawSDHy8vUmk |
||||
5N2KAj9abvT9NP5SMS1hQi3usxoYGonXQgfO6ZXyUA9a+KAkqdFnBnlyugSeCOep |
||||
8EdZFfsaRFtMjkwz5Gcz2Py4vIYvCdMHPtwaz0bVuzneueIEz6TnQjE63Rdt2zbw |
||||
nebwTG5ZybeWSwbzy+BJ34ZHcUhPAY89yJQXuE0IzMZFcEBbPNRbWECRKgjq//qT
|
||||
9nmDOFVlSRCt2wiqPSzluwn+v+suQEBsUjTGMEd25tKXXTkNW21wIWbxeSyUoTXw |
||||
LvGS6xlwQSgNpk2qXYwf8iXg7VWZAgMBAAGjQjBAMB0GA1UdDgQWBBQgIvz0bNGJ |
||||
hjgpToksyKpP9xv9oDAPBgNVHRMECDAGAQH/AgEAMA4GA1UdDwEB/wQEAwIBBjAN |
||||
BgkqhkiG9w0BAQsFAAOCAQEAjvjuOMDSa+JXFCLyBKsycXtBVZsJ4Ue3LbaEsPY4 |
||||
MYN/hIQ5ZM5p7EjfcnMG4CtYkNsfNHc0AhBLdq45rnT87q/6O3vUEtNMafbhU6kt |
||||
hX7Y+9XFN9NpmYxr+ekVY5xOxi8h9JDIgoMP4VB1uS0aunL1IGqrNooL9mmFnL2k |
||||
LVVee6/VR6C5+KSTCMCWppMuJIZII2v9o4dkoZ8Y7QRjQlLfYzd3qGtKbw7xaF1U |
||||
sG/5xUb/Btwb2X2g4InpiB/yt/3CpQXpiWX/K4mBvUKiGn05ZsqeY1gx4g0xLBqc |
||||
U9psmyPzK+Vsgw2jeRQ5JlKDyqE0hebfC1tvFu0CCrJFcw== |
||||
-----END CERTIFICATE----- |
||||
` |
||||
|
||||
const entersektCert = `-----BEGIN CERTIFICATE----- |
||||
MIICHjCCAcOgAwIBAgIBADAKBggqhkjOPQQDAjBvMQswCQYDVQQGEwJaQTEVMBMG |
||||
A1UECAwMV2VzdGVybiBDYXBlMRUwEwYDVQQHDAxTdGVsbGVuYm9zY2gxEjAQBgNV |
||||
BAoMCUVudGVyc2VrdDELMAkGA1UECwwCSVQxETAPBgNVBAMMCFRyYW5zYWt0MB4X |
||||
DTE0MTEwMTExMjczNFoXDTE1MTEwMTExMjczNFowbzELMAkGA1UEBhMCWkExFTAT |
||||
BgNVBAgMDFdlc3Rlcm4gQ2FwZTEVMBMGA1UEBwwMU3RlbGxlbmJvc2NoMRIwEAYD |
||||
VQQKDAlFbnRlcnNla3QxCzAJBgNVBAsMAklUMREwDwYDVQQDDAhUcmFuc2FrdDBZ |
||||
MBMGByqGSM49AgEGCCqGSM49AwEHA0IABBh10blFheMZy3k2iqW9TzLhS1DbJ/Xf |
||||
DxqQJJkpqTLq7vI+K3O4C20YtN0jsVrj7UylWoSRlPL5F7IkbeQ6aZ6jUDBOMB0G |
||||
A1UdDgQWBBQWRFF7mVAipWTdfBWk2B8Dv4Ab4jAfBgNVHSMEGDAWgBQWRFF7mVAi |
||||
pWTdfBWk2B8Dv4Ab4jAMBgNVHRMEBTADAQH/MAoGCCqGSM49BAMCA0kAMEYCIQCo |
||||
bMURXOxv6pqz6ECBh0zgL2vVhEfTOZJOW0PACGalWgIhAME0LHGi6ZS7z9yzHNqi |
||||
cnRb+okM+PIy/hBcBuqTWCbw |
||||
-----END CERTIFICATE----- |
||||
` |
||||
|
||||
func mustLoadPool(pemCerts []byte) *x509.CertPool { |
||||
p := x509.NewCertPool() |
||||
if !p.AppendCertsFromPEM(pemCerts) { |
||||
log.Fatal("u2f: Error loading root cert pool.") |
||||
return nil |
||||
} |
||||
return p |
||||
} |
||||
|
||||
var roots = mustLoadPool([]byte(yubicoRootCert + entersektCert + neowaveCert + plugUpCert)) |
||||
@ -0,0 +1,87 @@ |
||||
// Go FIDO U2F Library
|
||||
// Copyright 2015 The Go FIDO U2F Library Authors. All rights reserved.
|
||||
// Use of this source code is governed by the MIT
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package u2f |
||||
|
||||
import ( |
||||
"encoding/json" |
||||
) |
||||
|
||||
// JwkKey represents a public key used by a browser for the Channel ID TLS
|
||||
// extension.
|
||||
type JwkKey struct { |
||||
KTy string `json:"kty"` |
||||
Crv string `json:"crv"` |
||||
X string `json:"x"` |
||||
Y string `json:"y"` |
||||
} |
||||
|
||||
// ClientData as defined by the FIDO U2F Raw Message Formats specification.
|
||||
type ClientData struct { |
||||
Typ string `json:"typ"` |
||||
Challenge string `json:"challenge"` |
||||
Origin string `json:"origin"` |
||||
CIDPubKey json.RawMessage `json:"cid_pubkey"` |
||||
} |
||||
|
||||
// RegisterRequest as defined by the FIDO U2F Javascript API 1.1.
|
||||
type RegisterRequest struct { |
||||
Version string `json:"version"` |
||||
Challenge string `json:"challenge"` |
||||
} |
||||
|
||||
// WebRegisterRequest contains the parameters needed for the u2f.register()
|
||||
// high-level Javascript API function as defined by the
|
||||
// FIDO U2F Javascript API 1.1.
|
||||
type WebRegisterRequest struct { |
||||
AppID string `json:"appId"` |
||||
RegisterRequests []RegisterRequest `json:"registerRequests"` |
||||
RegisteredKeys []RegisteredKey `json:"registeredKeys"` |
||||
} |
||||
|
||||
// RegisterResponse as defined by the FIDO U2F Javascript API 1.1.
|
||||
type RegisterResponse struct { |
||||
Version string `json:"version"` |
||||
RegistrationData string `json:"registrationData"` |
||||
ClientData string `json:"clientData"` |
||||
} |
||||
|
||||
// RegisteredKey as defined by the FIDO U2F Javascript API 1.1.
|
||||
type RegisteredKey struct { |
||||
Version string `json:"version"` |
||||
KeyHandle string `json:"keyHandle"` |
||||
AppID string `json:"appId"` |
||||
} |
||||
|
||||
// WebSignRequest contains the parameters needed for the u2f.sign()
|
||||
// high-level Javascript API function as defined by the
|
||||
// FIDO U2F Javascript API 1.1.
|
||||
type WebSignRequest struct { |
||||
AppID string `json:"appId"` |
||||
Challenge string `json:"challenge"` |
||||
RegisteredKeys []RegisteredKey `json:"registeredKeys"` |
||||
} |
||||
|
||||
// SignResponse as defined by the FIDO U2F Javascript API 1.1.
|
||||
type SignResponse struct { |
||||
KeyHandle string `json:"keyHandle"` |
||||
SignatureData string `json:"signatureData"` |
||||
ClientData string `json:"clientData"` |
||||
} |
||||
|
||||
// TrustedFacets as defined by the FIDO AppID and Facet Specification.
|
||||
type TrustedFacets struct { |
||||
Version struct { |
||||
Major int `json:"major"` |
||||
Minor int `json:"minor"` |
||||
} `json:"version"` |
||||
Ids []string `json:"ids"` |
||||
} |
||||
|
||||
// TrustedFacetsEndpoint is a container of TrustedFacets.
|
||||
// It is used as the response for an appId URL endpoint.
|
||||
type TrustedFacetsEndpoint struct { |
||||
TrustedFacets []TrustedFacets `json:"trustedFacets"` |
||||
} |
||||
@ -0,0 +1,230 @@ |
||||
// Go FIDO U2F Library
|
||||
// Copyright 2015 The Go FIDO U2F Library Authors. All rights reserved.
|
||||
// Use of this source code is governed by the MIT
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package u2f |
||||
|
||||
import ( |
||||
"crypto/ecdsa" |
||||
"crypto/elliptic" |
||||
"crypto/sha256" |
||||
"crypto/x509" |
||||
"encoding/asn1" |
||||
"encoding/hex" |
||||
"errors" |
||||
"time" |
||||
) |
||||
|
||||
// Registration represents a single enrolment or pairing between an
|
||||
// application and a token. This data will typically be stored in a database.
|
||||
type Registration struct { |
||||
// Raw serialized registration data as received from the token.
|
||||
Raw []byte |
||||
|
||||
KeyHandle []byte |
||||
PubKey ecdsa.PublicKey |
||||
|
||||
// AttestationCert can be nil for Authenticate requests.
|
||||
AttestationCert *x509.Certificate |
||||
} |
||||
|
||||
// Config contains configurable options for the package.
|
||||
type Config struct { |
||||
// SkipAttestationVerify controls whether the token attestation
|
||||
// certificate should be verified on registration. Ideally it should
|
||||
// always be verified. However, there is currently no public list of
|
||||
// trusted attestation root certificates so it may be necessary to skip.
|
||||
SkipAttestationVerify bool |
||||
|
||||
// RootAttestationCertPool overrides the default root certificates used
|
||||
// to verify client attestations. If nil, this defaults to the roots that are
|
||||
// bundled in this library.
|
||||
RootAttestationCertPool *x509.CertPool |
||||
} |
||||
|
||||
// Register validates a RegisterResponse message to enrol a new token.
|
||||
// An error is returned if any part of the response fails to validate.
|
||||
// The returned Registration should be stored by the caller.
|
||||
func Register(resp RegisterResponse, c Challenge, config *Config) (*Registration, error) { |
||||
if config == nil { |
||||
config = &Config{} |
||||
} |
||||
|
||||
if time.Now().Sub(c.Timestamp) > timeout { |
||||
return nil, errors.New("u2f: challenge has expired") |
||||
} |
||||
|
||||
regData, err := decodeBase64(resp.RegistrationData) |
||||
if err != nil { |
||||
return nil, err |
||||
} |
||||
|
||||
clientData, err := decodeBase64(resp.ClientData) |
||||
if err != nil { |
||||
return nil, err |
||||
} |
||||
|
||||
reg, sig, err := parseRegistration(regData) |
||||
if err != nil { |
||||
return nil, err |
||||
} |
||||
|
||||
if err := verifyClientData(clientData, c); err != nil { |
||||
return nil, err |
||||
} |
||||
|
||||
if err := verifyAttestationCert(*reg, config); err != nil { |
||||
return nil, err |
||||
} |
||||
|
||||
if err := verifyRegistrationSignature(*reg, sig, c.AppID, clientData); err != nil { |
||||
return nil, err |
||||
} |
||||
|
||||
return reg, nil |
||||
} |
||||
|
||||
func parseRegistration(buf []byte) (*Registration, []byte, error) { |
||||
if len(buf) < 1+65+1+1+1 { |
||||
return nil, nil, errors.New("u2f: data is too short") |
||||
} |
||||
|
||||
var r Registration |
||||
r.Raw = buf |
||||
|
||||
if buf[0] != 0x05 { |
||||
return nil, nil, errors.New("u2f: invalid reserved byte") |
||||
} |
||||
buf = buf[1:] |
||||
|
||||
x, y := elliptic.Unmarshal(elliptic.P256(), buf[:65]) |
||||
if x == nil { |
||||
return nil, nil, errors.New("u2f: invalid public key") |
||||
} |
||||
r.PubKey.Curve = elliptic.P256() |
||||
r.PubKey.X = x |
||||
r.PubKey.Y = y |
||||
buf = buf[65:] |
||||
|
||||
khLen := int(buf[0]) |
||||
buf = buf[1:] |
||||
if len(buf) < khLen { |
||||
return nil, nil, errors.New("u2f: invalid key handle") |
||||
} |
||||
r.KeyHandle = buf[:khLen] |
||||
buf = buf[khLen:] |
||||
|
||||
// The length of the x509 cert isn't specified so it has to be inferred
|
||||
// by parsing. We can't use x509.ParseCertificate yet because it returns
|
||||
// an error if there are any trailing bytes. So parse raw asn1 as a
|
||||
// workaround to get the length.
|
||||
sig, err := asn1.Unmarshal(buf, &asn1.RawValue{}) |
||||
if err != nil { |
||||
return nil, nil, err |
||||
} |
||||
|
||||
buf = buf[:len(buf)-len(sig)] |
||||
fixCertIfNeed(buf) |
||||
cert, err := x509.ParseCertificate(buf) |
||||
if err != nil { |
||||
return nil, nil, err |
||||
} |
||||
r.AttestationCert = cert |
||||
|
||||
return &r, sig, nil |
||||
} |
||||
|
||||
// UnmarshalBinary implements encoding.BinaryMarshaler.
|
||||
func (r *Registration) UnmarshalBinary(data []byte) error { |
||||
reg, _, err := parseRegistration(data) |
||||
if err != nil { |
||||
return err |
||||
} |
||||
*r = *reg |
||||
return nil |
||||
} |
||||
|
||||
// MarshalBinary implements encoding.BinaryUnmarshaler.
|
||||
func (r *Registration) MarshalBinary() ([]byte, error) { |
||||
return r.Raw, nil |
||||
} |
||||
|
||||
func verifyAttestationCert(r Registration, config *Config) error { |
||||
if config.SkipAttestationVerify { |
||||
return nil |
||||
} |
||||
rootCertPool := roots |
||||
if config.RootAttestationCertPool != nil { |
||||
rootCertPool = config.RootAttestationCertPool |
||||
} |
||||
|
||||
opts := x509.VerifyOptions{Roots: rootCertPool} |
||||
_, err := r.AttestationCert.Verify(opts) |
||||
return err |
||||
} |
||||
|
||||
func verifyRegistrationSignature( |
||||
r Registration, signature []byte, appid string, clientData []byte) error { |
||||
|
||||
appParam := sha256.Sum256([]byte(appid)) |
||||
challenge := sha256.Sum256(clientData) |
||||
|
||||
buf := []byte{0} |
||||
buf = append(buf, appParam[:]...) |
||||
buf = append(buf, challenge[:]...) |
||||
buf = append(buf, r.KeyHandle...) |
||||
pk := elliptic.Marshal(r.PubKey.Curve, r.PubKey.X, r.PubKey.Y) |
||||
buf = append(buf, pk...) |
||||
|
||||
return r.AttestationCert.CheckSignature( |
||||
x509.ECDSAWithSHA256, buf, signature) |
||||
} |
||||
|
||||
func getRegisteredKey(appID string, r Registration) RegisteredKey { |
||||
return RegisteredKey{ |
||||
Version: u2fVersion, |
||||
KeyHandle: encodeBase64(r.KeyHandle), |
||||
AppID: appID, |
||||
} |
||||
} |
||||
|
||||
// fixCertIfNeed fixes broken certificates described in
|
||||
// https://github.com/Yubico/php-u2flib-server/blob/master/src/u2flib_server/U2F.php#L84
|
||||
func fixCertIfNeed(cert []byte) { |
||||
h := sha256.Sum256(cert) |
||||
switch hex.EncodeToString(h[:]) { |
||||
case |
||||
"349bca1031f8c82c4ceca38b9cebf1a69df9fb3b94eed99eb3fb9aa3822d26e8", |
||||
"dd574527df608e47ae45fbba75a2afdd5c20fd94a02419381813cd55a2a3398f", |
||||
"1d8764f0f7cd1352df6150045c8f638e517270e8b5dda1c63ade9c2280240cae", |
||||
"d0edc9a91a1677435a953390865d208c55b3183c6759c9b5a7ff494c322558eb", |
||||
"6073c436dcd064a48127ddbf6032ac1a66fd59a0c24434f070d4e564c124c897", |
||||
"ca993121846c464d666096d35f13bf44c1b05af205f9b4a1e00cf6cc10c5e511": |
||||
|
||||
// clear the offending byte.
|
||||
cert[len(cert)-257] = 0 |
||||
} |
||||
} |
||||
|
||||
// NewWebRegisterRequest creates a request to enrol a new token.
|
||||
// regs is the list of the user's existing registration. The browser will
|
||||
// refuse to re-register a device if it has an existing registration.
|
||||
func NewWebRegisterRequest(c *Challenge, regs []Registration) *WebRegisterRequest { |
||||
req := RegisterRequest{ |
||||
Version: u2fVersion, |
||||
Challenge: encodeBase64(c.Challenge), |
||||
} |
||||
|
||||
rr := WebRegisterRequest{ |
||||
AppID: c.AppID, |
||||
RegisterRequests: []RegisterRequest{req}, |
||||
} |
||||
|
||||
for _, r := range regs { |
||||
rk := getRegisteredKey(c.AppID, r) |
||||
rr.RegisteredKeys = append(rr.RegisteredKeys, rk) |
||||
} |
||||
|
||||
return &rr |
||||
} |
||||
@ -0,0 +1,125 @@ |
||||
// Go FIDO U2F Library
|
||||
// Copyright 2015 The Go FIDO U2F Library Authors. All rights reserved.
|
||||
// Use of this source code is governed by the MIT
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
/* |
||||
Package u2f implements the server-side parts of the |
||||
FIDO Universal 2nd Factor (U2F) specification. |
||||
|
||||
Applications will usually persist Challenge and Registration objects in a |
||||
database. |
||||
|
||||
To enrol a new token: |
||||
|
||||
app_id := "http://localhost" |
||||
c, _ := NewChallenge(app_id, []string{app_id}) |
||||
req, _ := u2f.NewWebRegisterRequest(c, existingTokens) |
||||
// Send the request to the browser.
|
||||
var resp RegisterResponse |
||||
// Read resp from the browser.
|
||||
reg, err := Register(resp, c) |
||||
if err != nil { |
||||
// Registration failed.
|
||||
} |
||||
// Store reg in the database.
|
||||
|
||||
To perform an authentication: |
||||
|
||||
var regs []Registration |
||||
// Fetch regs from the database.
|
||||
c, _ := NewChallenge(app_id, []string{app_id}) |
||||
req, _ := c.SignRequest(regs) |
||||
// Send the request to the browser.
|
||||
var resp SignResponse |
||||
// Read resp from the browser.
|
||||
new_counter, err := reg.Authenticate(resp, c) |
||||
if err != nil { |
||||
// Authentication failed.
|
||||
} |
||||
reg.Counter = new_counter |
||||
// Store updated Registration in the database.
|
||||
|
||||
The FIDO U2F specification can be found here: |
||||
https://fidoalliance.org/specifications/download
|
||||
*/ |
||||
package u2f |
||||
|
||||
import ( |
||||
"crypto/rand" |
||||
"crypto/subtle" |
||||
"encoding/base64" |
||||
"encoding/json" |
||||
"errors" |
||||
"strings" |
||||
"time" |
||||
) |
||||
|
||||
const u2fVersion = "U2F_V2" |
||||
const timeout = 5 * time.Minute |
||||
|
||||
func decodeBase64(s string) ([]byte, error) { |
||||
for i := 0; i < len(s)%4; i++ { |
||||
s += "=" |
||||
} |
||||
return base64.URLEncoding.DecodeString(s) |
||||
} |
||||
|
||||
func encodeBase64(buf []byte) string { |
||||
s := base64.URLEncoding.EncodeToString(buf) |
||||
return strings.TrimRight(s, "=") |
||||
} |
||||
|
||||
// Challenge represents a single transaction between the server and
|
||||
// authenticator. This data will typically be stored in a database.
|
||||
type Challenge struct { |
||||
Challenge []byte |
||||
Timestamp time.Time |
||||
AppID string |
||||
TrustedFacets []string |
||||
} |
||||
|
||||
// NewChallenge generates a challenge for the given application.
|
||||
func NewChallenge(appID string, trustedFacets []string) (*Challenge, error) { |
||||
challenge := make([]byte, 32) |
||||
n, err := rand.Read(challenge) |
||||
if err != nil { |
||||
return nil, err |
||||
} |
||||
if n != 32 { |
||||
return nil, errors.New("u2f: unable to generate random bytes") |
||||
} |
||||
|
||||
var c Challenge |
||||
c.Challenge = challenge |
||||
c.Timestamp = time.Now() |
||||
c.AppID = appID |
||||
c.TrustedFacets = trustedFacets |
||||
return &c, nil |
||||
} |
||||
|
||||
func verifyClientData(clientData []byte, challenge Challenge) error { |
||||
var cd ClientData |
||||
if err := json.Unmarshal(clientData, &cd); err != nil { |
||||
return err |
||||
} |
||||
|
||||
foundFacetID := false |
||||
for _, facetID := range challenge.TrustedFacets { |
||||
if facetID == cd.Origin { |
||||
foundFacetID = true |
||||
break |
||||
} |
||||
} |
||||
if !foundFacetID { |
||||
return errors.New("u2f: untrusted facet id") |
||||
} |
||||
|
||||
c := encodeBase64(challenge.Challenge) |
||||
if len(c) != len(cd.Challenge) || |
||||
subtle.ConstantTimeCompare([]byte(c), []byte(cd.Challenge)) != 1 { |
||||
return errors.New("u2f: challenge does not match") |
||||
} |
||||
|
||||
return nil |
||||
} |
||||
Loading…
Reference in new issue