mirror of
https://github.com/go-gitea/gitea
synced 2024-12-23 17:14:27 +00:00
951309f76a
* 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>
126 lines
3.0 KiB
Go
126 lines
3.0 KiB
Go
// 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
|
|
}
|