Merge pull request #227 from jehiah/base64_cookie_encoding_227

Cookie secret encoding?
This commit is contained in:
Jehiah Czebotar 2016-06-20 07:48:38 -04:00 committed by GitHub
commit 2fa0a35c7f
9 changed files with 93 additions and 18 deletions

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@ -85,8 +85,8 @@ type Cipher struct {
}
// NewCipher returns a new aes Cipher for encrypting cookie values
func NewCipher(secret string) (*Cipher, error) {
c, err := aes.NewCipher([]byte(secret))
func NewCipher(secret []byte) (*Cipher, error) {
c, err := aes.NewCipher(secret)
if err != nil {
return nil, err
}

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@ -1,6 +1,7 @@
package cookie
import (
"encoding/base64"
"testing"
"github.com/bmizerany/assert"
@ -9,7 +10,25 @@ import (
func TestEncodeAndDecodeAccessToken(t *testing.T) {
const secret = "0123456789abcdefghijklmnopqrstuv"
const token = "my access token"
c, err := NewCipher(secret)
c, err := NewCipher([]byte(secret))
assert.Equal(t, nil, err)
encoded, err := c.Encrypt(token)
assert.Equal(t, nil, err)
decoded, err := c.Decrypt(encoded)
assert.Equal(t, nil, err)
assert.NotEqual(t, token, encoded)
assert.Equal(t, token, decoded)
}
func TestEncodeAndDecodeAccessTokenB64(t *testing.T) {
const secret_b64 = "A3Xbr6fu6Al0HkgrP1ztjb-mYiwmxgNPP-XbNsz1WBk="
const token = "my access token"
secret, err := base64.URLEncoding.DecodeString(secret_b64)
c, err := NewCipher([]byte(secret))
assert.Equal(t, nil, err)
encoded, err := c.Encrypt(token)

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@ -55,7 +55,7 @@ func main() {
flagSet.String("proxy-prefix", "/oauth2", "the url root path that this proxy should be nested under (e.g. /<oauth2>/sign_in)")
flagSet.String("cookie-name", "_oauth2_proxy", "the name of the cookie that the oauth_proxy creates")
flagSet.String("cookie-secret", "", "the seed string for secure cookies")
flagSet.String("cookie-secret", "", "the seed string for secure cookies (optionally base64 encoded)")
flagSet.String("cookie-domain", "", "an optional cookie domain to force cookies to (ie: .yourcompany.com)*")
flagSet.Duration("cookie-expire", time.Duration(168)*time.Hour, "expire timeframe for cookie")
flagSet.Duration("cookie-refresh", time.Duration(0), "refresh the cookie after this duration; 0 to disable")

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@ -1,7 +1,7 @@
package main
import (
"encoding/base64"
b64 "encoding/base64"
"errors"
"fmt"
"html/template"
@ -164,10 +164,9 @@ func NewOAuthProxy(opts *Options, validator func(string) bool) *OAuthProxy {
var cipher *cookie.Cipher
if opts.PassAccessToken || (opts.CookieRefresh != time.Duration(0)) {
var err error
cipher, err = cookie.NewCipher(opts.CookieSecret)
cipher, err = cookie.NewCipher(secretBytes(opts.CookieSecret))
if err != nil {
log.Fatal("error creating AES cipher with "+
"cookie-secret ", opts.CookieSecret, ": ", err)
log.Fatal("cookie-secret error: ", err)
}
}
@ -626,7 +625,7 @@ func (p *OAuthProxy) CheckBasicAuth(req *http.Request) (*providers.SessionState,
if len(s) != 2 || s[0] != "Basic" {
return nil, fmt.Errorf("invalid Authorization header %s", req.Header.Get("Authorization"))
}
b, err := base64.StdEncoding.DecodeString(s[1])
b, err := b64.StdEncoding.DecodeString(s[1])
if err != nil {
return nil, err
}

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@ -427,7 +427,7 @@ func NewProcessCookieTest(opts ProcessCookieTestOpts) *ProcessCookieTest {
pc_test.opts = NewOptions()
pc_test.opts.ClientID = "bazquux"
pc_test.opts.ClientSecret = "xyzzyplugh"
pc_test.opts.CookieSecret = "0123456789abcdef"
pc_test.opts.CookieSecret = "0123456789abcdefabcd"
// First, set the CookieRefresh option so proxy.AesCipher is created,
// needed to encrypt the access_token.
pc_test.opts.CookieRefresh = time.Hour

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@ -2,6 +2,7 @@ package main
import (
"crypto"
"encoding/base64"
"fmt"
"net/url"
"os"
@ -156,17 +157,25 @@ func (o *Options) Validate() error {
if o.PassAccessToken || (o.CookieRefresh != time.Duration(0)) {
valid_cookie_secret_size := false
for _, i := range []int{16, 24, 32} {
if len(o.CookieSecret) == i {
if len(secretBytes(o.CookieSecret)) == i {
valid_cookie_secret_size = true
}
}
var decoded bool
if string(secretBytes(o.CookieSecret)) != o.CookieSecret {
decoded = true
}
if valid_cookie_secret_size == false {
var suffix string
if decoded {
suffix = fmt.Sprintf(" note: cookie secret was base64 decoded from %q", o.CookieSecret)
}
msgs = append(msgs, fmt.Sprintf(
"cookie_secret must be 16, 24, or 32 bytes "+
"to create an AES cipher when "+
"pass_access_token == true or "+
"cookie_refresh != 0, but is %d bytes",
len(o.CookieSecret)))
"cookie_refresh != 0, but is %d bytes.%s",
len(secretBytes(o.CookieSecret)), suffix))
}
}
@ -251,3 +260,26 @@ func parseSignatureKey(o *Options, msgs []string) []string {
}
return msgs
}
func addPadding(secret string) string {
padding := len(secret) % 4
switch padding {
case 1:
return secret + "==="
case 2:
return secret + "=="
case 3:
return secret + "="
default:
return secret
}
}
// secretBytes attempts to base64 decode the secret, if that fails it treats the secret as binary
func secretBytes(secret string) []byte {
b, err := base64.URLEncoding.DecodeString(addPadding(secret))
if err == nil {
return []byte(addPadding(string(b)))
}
return []byte(secret)
}

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@ -160,7 +160,7 @@ func TestCookieRefreshMustBeLessThanCookieExpire(t *testing.T) {
o := testOptions()
assert.Equal(t, nil, o.Validate())
o.CookieSecret = "0123456789abcdef"
o.CookieSecret = "0123456789abcdefabcd"
o.CookieRefresh = o.CookieExpire
assert.NotEqual(t, nil, o.Validate())
@ -168,6 +168,31 @@ func TestCookieRefreshMustBeLessThanCookieExpire(t *testing.T) {
assert.Equal(t, nil, o.Validate())
}
func TestBase64CookieSecret(t *testing.T) {
o := testOptions()
assert.Equal(t, nil, o.Validate())
// 32 byte, base64 (urlsafe) encoded key
o.CookieSecret = "yHBw2lh2Cvo6aI_jn_qMTr-pRAjtq0nzVgDJNb36jgQ="
assert.Equal(t, nil, o.Validate())
// 32 byte, base64 (urlsafe) encoded key, w/o padding
o.CookieSecret = "yHBw2lh2Cvo6aI_jn_qMTr-pRAjtq0nzVgDJNb36jgQ"
assert.Equal(t, nil, o.Validate())
// 24 byte, base64 (urlsafe) encoded key
o.CookieSecret = "Kp33Gj-GQmYtz4zZUyUDdqQKx5_Hgkv3"
assert.Equal(t, nil, o.Validate())
// 16 byte, base64 (urlsafe) encoded key
o.CookieSecret = "LFEqZYvYUwKwzn0tEuTpLA=="
assert.Equal(t, nil, o.Validate())
// 16 byte, base64 (urlsafe) encoded key, w/o padding
o.CookieSecret = "LFEqZYvYUwKwzn0tEuTpLA"
assert.Equal(t, nil, o.Validate())
}
func TestValidateSignatureKey(t *testing.T) {
o := testOptions()
o.SignatureKey = "sha1:secret"

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@ -3,11 +3,11 @@ package providers
import (
"encoding/json"
"fmt"
"strings"
"io/ioutil"
"log"
"net/http"
"net/url"
"strings"
)
type GitHubProvider struct {

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@ -13,9 +13,9 @@ const secret = "0123456789abcdefghijklmnopqrstuv"
const altSecret = "0000000000abcdefghijklmnopqrstuv"
func TestSessionStateSerialization(t *testing.T) {
c, err := cookie.NewCipher(secret)
c, err := cookie.NewCipher([]byte(secret))
assert.Equal(t, nil, err)
c2, err := cookie.NewCipher(altSecret)
c2, err := cookie.NewCipher([]byte(altSecret))
assert.Equal(t, nil, err)
s := &SessionState{
Email: "user@domain.com",