server: fix expiry detection for verification keys
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bb896a8222
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2c4752d5d4
@ -22,8 +22,9 @@ type rotationStrategy struct {
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// Time between rotations.
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rotationFrequency time.Duration
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// After being rotated how long can a key validate signatues?
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verifyFor time.Duration
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// After being rotated how long should the key be kept around for validating
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// signatues?
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idTokenValidFor time.Duration
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// Keys are always RSA keys. Though cryptopasta recommends ECDSA keys, not every
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// client may support these (e.g. github.com/coreos/go-oidc/oidc).
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@ -35,17 +36,17 @@ func staticRotationStrategy(key *rsa.PrivateKey) rotationStrategy {
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return rotationStrategy{
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// Setting these values to 100 years is easier than having a flag indicating no rotation.
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rotationFrequency: time.Hour * 8760 * 100,
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verifyFor: time.Hour * 8760 * 100,
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idTokenValidFor: time.Hour * 8760 * 100,
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key: func() (*rsa.PrivateKey, error) { return key, nil },
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}
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}
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// defaultRotationStrategy returns a strategy which rotates keys every provided period,
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// holding onto the public parts for some specified amount of time.
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func defaultRotationStrategy(rotationFrequency, verifyFor time.Duration) rotationStrategy {
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func defaultRotationStrategy(rotationFrequency, idTokenValidFor time.Duration) rotationStrategy {
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return rotationStrategy{
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rotationFrequency: rotationFrequency,
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verifyFor: verifyFor,
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idTokenValidFor: idTokenValidFor,
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key: func() (*rsa.PrivateKey, error) {
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return rsa.GenerateKey(rand.Reader, 2048)
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},
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@ -128,11 +129,14 @@ func (k keyRotater) rotate() error {
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return storage.Keys{}, errors.New("keys already rotated")
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}
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// Remove expired verification keys.
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i := 0
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expired := func(key storage.VerificationKey) bool {
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return tNow.After(key.Expiry)
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}
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// Remove any verification keys that have expired.
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i := 0
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for _, key := range keys.VerificationKeys {
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if !key.Expiry.After(tNow) {
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if !expired(key) {
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keys.VerificationKeys[i] = key
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i++
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}
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@ -140,10 +144,15 @@ func (k keyRotater) rotate() error {
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keys.VerificationKeys = keys.VerificationKeys[:i]
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if keys.SigningKeyPub != nil {
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// Move current signing key to a verification only key.
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// Move current signing key to a verification only key, throwing
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// away the private part.
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verificationKey := storage.VerificationKey{
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PublicKey: keys.SigningKeyPub,
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Expiry: tNow.Add(k.strategy.verifyFor),
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// After demoting the signing key, keep the token around for at least
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// the amount of time an ID Token is valid for. This ensures the
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// verification key won't expire until all ID Tokens it's signed
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// expired as well.
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Expiry: tNow.Add(k.strategy.idTokenValidFor),
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}
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keys.VerificationKeys = append(keys.VerificationKeys, verificationKey)
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}
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@ -1 +1,101 @@
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package server
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import (
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"os"
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"sort"
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"testing"
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"time"
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"github.com/Sirupsen/logrus"
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"github.com/coreos/dex/storage"
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"github.com/coreos/dex/storage/memory"
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)
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func signingKeyID(t *testing.T, s storage.Storage) string {
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keys, err := s.GetKeys()
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if err != nil {
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t.Fatal(err)
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}
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return keys.SigningKey.KeyID
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}
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func verificationKeyIDs(t *testing.T, s storage.Storage) (ids []string) {
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keys, err := s.GetKeys()
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if err != nil {
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t.Fatal(err)
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}
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for _, key := range keys.VerificationKeys {
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ids = append(ids, key.PublicKey.KeyID)
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}
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return ids
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}
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// slicesEq compare two string slices without modifying the ordering
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// of the slices.
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func slicesEq(s1, s2 []string) bool {
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if len(s1) != len(s2) {
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return false
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}
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cp := func(s []string) []string {
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c := make([]string, len(s))
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copy(c, s)
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return c
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}
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cp1 := cp(s1)
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cp2 := cp(s2)
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sort.Strings(cp1)
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sort.Strings(cp2)
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for i, el := range cp1 {
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if el != cp2[i] {
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return false
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}
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}
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return true
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}
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func TestKeyRotater(t *testing.T) {
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now := time.Now()
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delta := time.Millisecond
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rotationFrequency := time.Second * 5
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validFor := time.Second * 21
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// Only the last 5 verification keys are expected to be kept around.
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maxVerificationKeys := 5
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l := &logrus.Logger{
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Out: os.Stderr,
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Formatter: &logrus.TextFormatter{DisableColors: true},
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Level: logrus.DebugLevel,
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}
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r := &keyRotater{
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Storage: memory.New(l),
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strategy: defaultRotationStrategy(rotationFrequency, validFor),
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now: func() time.Time { return now },
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logger: l,
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}
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var expVerificationKeys []string
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for i := 0; i < 10; i++ {
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now = now.Add(rotationFrequency + delta)
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if err := r.rotate(); err != nil {
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t.Fatal(err)
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}
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got := verificationKeyIDs(t, r.Storage)
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if !slicesEq(expVerificationKeys, got) {
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t.Errorf("after %d rotation, expected varification keys %q, got %q", i+1, expVerificationKeys, got)
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}
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expVerificationKeys = append(expVerificationKeys, signingKeyID(t, r.Storage))
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if n := len(expVerificationKeys); n > maxVerificationKeys {
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expVerificationKeys = expVerificationKeys[n-maxVerificationKeys:]
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}
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}
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}
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