storage: fix postgres timezone handling

Dex's Postgres client currently uses the `timestamp` datatype for
storing times. This lops of timezones with no conversion, causing
times to lose locality information.

We could convert all times to UTC before storing them, but this is
a backward incompatible change for upgrades, since the new version
of dex would still be reading times from the database with no
locality.

Because of this intrinsic issue that current Postgres users don't
save any timezone data, we chose to treat any existing installation
as corrupted and change the datatype used for times to `timestamptz`.
This is a breaking change, but it seems hard to offer an
alternative that's both correct and backward compatible.

Additionally, an internal flag has been added to SQL flavors,
`supportsTimezones`. This allows us to handle SQLite3, which doesn't
support timezones, while still storing timezones in other flavors.
Flavors that don't support timezones are explicitly converted to
UTC.

storage/conformance/conformance.go

@@ -48,6 +48,7 @@ func RunTests(t *testing.T, newStorage func() storage.Storage) {
 		{"PasswordCRUD", testPasswordCRUD},
 		{"KeysCRUD", testKeysCRUD},
 		{"GarbageCollection", testGC},
+		{"TimezoneSupport", testTimezones},
 	})
 }
 
@@ -370,14 +371,23 @@ func testKeysCRUD(t *testing.T, s storage.Storage) {
 }
 
 func testGC(t *testing.T, s storage.Storage) {
-	n := time.Now().UTC()
+	est, err := time.LoadLocation("America/New_York")
+	if err != nil {
+		t.Fatal(err)
+	}
+	pst, err := time.LoadLocation("America/Los_Angeles")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expiry := time.Now().In(est)
 	c := storage.AuthCode{
 		ID:            storage.NewID(),
 		ClientID:      "foobar",
 		RedirectURI:   "https://localhost:80/callback",
 		Nonce:         "foobar",
 		Scopes:        []string{"openid", "email"},
-		Expiry:        n.Add(time.Second),
+		Expiry:        expiry,
 		ConnectorID:   "ldap",
 		ConnectorData: []byte(`{"some":"data"}`),
 		Claims: storage.Claims{
@@ -393,14 +403,21 @@ func testGC(t *testing.T, s storage.Storage) {
 		t.Fatalf("failed creating auth code: %v", err)
 	}
 
-	if _, err := s.GarbageCollect(n); err != nil {
+	for _, tz := range []*time.Location{time.UTC, est, pst} {
+		result, err := s.GarbageCollect(expiry.Add(-time.Hour).In(tz))
+		if err != nil {
 			t.Errorf("garbage collection failed: %v", err)
+		} else {
+			if result.AuthCodes != 0 || result.AuthRequests != 0 {
+				t.Errorf("expected no garbage collection results, got %#v", result)
+			}
 		}
 		if _, err := s.GetAuthCode(c.ID); err != nil {
 			t.Errorf("expected to be able to get auth code after GC: %v", err)
 		}
+	}
 
-	if r, err := s.GarbageCollect(n.Add(time.Minute)); err != nil {
+	if r, err := s.GarbageCollect(expiry.Add(time.Hour)); err != nil {
 		t.Errorf("garbage collection failed: %v", err)
 	} else if r.AuthCodes != 1 {
 		t.Errorf("expected to garbage collect 1 objects, got %d", r.AuthCodes)
@@ -422,7 +439,7 @@ func testGC(t *testing.T, s storage.Storage) {
 		State:               "bar",
 		ForceApprovalPrompt: true,
 		LoggedIn:            true,
-		Expiry:              n,
+		Expiry:              expiry,
 		ConnectorID:         "ldap",
 		ConnectorData:       []byte(`{"some":"data"}`),
 		Claims: storage.Claims{
@@ -438,14 +455,21 @@ func testGC(t *testing.T, s storage.Storage) {
 		t.Fatalf("failed creating auth request: %v", err)
 	}
 
-	if _, err := s.GarbageCollect(n); err != nil {
+	for _, tz := range []*time.Location{time.UTC, est, pst} {
+		result, err := s.GarbageCollect(expiry.Add(-time.Hour).In(tz))
+		if err != nil {
 			t.Errorf("garbage collection failed: %v", err)
+		} else {
+			if result.AuthCodes != 0 || result.AuthRequests != 0 {
+				t.Errorf("expected no garbage collection results, got %#v", result)
+			}
 		}
 		if _, err := s.GetAuthRequest(a.ID); err != nil {
 			t.Errorf("expected to be able to get auth code after GC: %v", err)
 		}
+	}
 
-	if r, err := s.GarbageCollect(n.Add(time.Minute)); err != nil {
+	if r, err := s.GarbageCollect(expiry.Add(time.Hour)); err != nil {
 		t.Errorf("garbage collection failed: %v", err)
 	} else if r.AuthRequests != 1 {
 		t.Errorf("expected to garbage collect 1 objects, got %d", r.AuthRequests)
@@ -457,3 +481,49 @@ func testGC(t *testing.T, s storage.Storage) {
 		t.Errorf("expected storage.ErrNotFound, got %v", err)
 	}
 }
+
+// testTimezones tests that backends either fully support timezones or
+// do the correct standardization.
+func testTimezones(t *testing.T, s storage.Storage) {
+	est, err := time.LoadLocation("America/New_York")
+	if err != nil {
+		t.Fatal(err)
+	}
+	// Create an expiry with timezone info. Only expect backends to be
+	// accurate to the millisecond
+	expiry := time.Now().In(est).Round(time.Millisecond)
+
+	c := storage.AuthCode{
+		ID:            storage.NewID(),
+		ClientID:      "foobar",
+		RedirectURI:   "https://localhost:80/callback",
+		Nonce:         "foobar",
+		Scopes:        []string{"openid", "email"},
+		Expiry:        expiry,
+		ConnectorID:   "ldap",
+		ConnectorData: []byte(`{"some":"data"}`),
+		Claims: storage.Claims{
+			UserID:        "1",
+			Username:      "jane",
+			Email:         "jane.doe@example.com",
+			EmailVerified: true,
+			Groups:        []string{"a", "b"},
+		},
+	}
+	if err := s.CreateAuthCode(c); err != nil {
+		t.Fatalf("failed creating auth code: %v", err)
+	}
+	got, err := s.GetAuthCode(c.ID)
+	if err != nil {
+		t.Fatalf("failed to get auth code: %v", err)
+	}
+
+	// Ensure that if the resulting time is converted to the same
+	// timezone, it's the same value. We DO NOT expect timezones
+	// to be preserved.
+	gotTime := got.Expiry.In(est)
+	wantTime := expiry
+	if !gotTime.Equal(wantTime) {
+		t.Fatalf("expected expiry %v got %v", wantTime, gotTime)
+	}
+}

storage/sql/migrate.go

@@ -9,7 +9,7 @@ func (c *conn) migrate() (int, error) {
 	_, err := c.Exec(`
 		create table if not exists migrations (
 			num integer not null,
-			at timestamp not null
+			at timestamptz not null
 		);
 	`)
 	if err != nil {
@@ -100,7 +100,7 @@ var migrations = []migration{
 				connector_id text not null,
 				connector_data bytea,
 		
-				expiry timestamp not null
+				expiry timestamptz not null
 			);
 		
 			create table auth_code (
@@ -119,7 +119,7 @@ var migrations = []migration{
 				connector_id text not null,
 				connector_data bytea,
 		
-				expiry timestamp not null
+				expiry timestamptz not null
 			);
 		
 			create table refresh_token (
@@ -151,7 +151,7 @@ var migrations = []migration{
 				verification_keys bytea not null, -- JSON array
 				signing_key bytea not null,       -- JSON object
 				signing_key_pub bytea not null,   -- JSON object
-				next_rotation timestamp not null
+				next_rotation timestamptz not null
 			);
 		`,
 	},

storage/sql/sql.go

@@ -4,6 +4,7 @@ package sql
 import (
 	"database/sql"
 	"regexp"
+	"time"
 
 	"github.com/Sirupsen/logrus"
 	"github.com/cockroachdb/cockroach-go/crdb"
@@ -28,6 +29,9 @@ type flavor struct {
 	//
 	// See: https://github.com/cockroachdb/docs/blob/63761c2e/_includes/app/txn-sample.go#L41-L44
 	executeTx func(db *sql.DB, fn func(*sql.Tx) error) error
+
+	// Does the flavor support timezones?
+	supportsTimezones bool
 }
 
 // A regexp with a replacement string.
@@ -69,6 +73,8 @@ var (
 			}
 			return tx.Commit()
 		},
+
+		supportsTimezones: true,
 	}
 
 	flavorSQLite3 = flavor{
@@ -80,7 +86,7 @@ var (
 			{matchLiteral("boolean"), "integer"},
 			// Translate other types.
 			{matchLiteral("bytea"), "blob"},
-			// {matchLiteral("timestamp"), "integer"},
+			{matchLiteral("timestamptz"), "timestamp"},
 			// SQLite doesn't have a "now()" method, replace with "date('now')"
 			{regexp.MustCompile(`\bnow\(\)`), "date('now')"},
 		},
@@ -107,6 +113,22 @@ func (f flavor) translate(query string) string {
 	return query
 }
 
+// translateArgs translates query parameters that may be unique to
+// a specific SQL flavor. For example, standardizing "time.Time"
+// types to UTC for clients that don't provide timezone support.
+func (c *conn) translateArgs(args []interface{}) []interface{} {
+	if c.flavor.supportsTimezones {
+		return args
+	}
+
+	for i, arg := range args {
+		if t, ok := arg.(time.Time); ok {
+			args[i] = t.UTC()
+		}
+	}
+	return args
+}
+
 // conn is the main database connection.
 type conn struct {
 	db     *sql.DB
@@ -122,17 +144,17 @@ func (c *conn) Close() error {
 
 func (c *conn) Exec(query string, args ...interface{}) (sql.Result, error) {
 	query = c.flavor.translate(query)
-	return c.db.Exec(query, args...)
+	return c.db.Exec(query, c.translateArgs(args)...)
 }
 
 func (c *conn) Query(query string, args ...interface{}) (*sql.Rows, error) {
 	query = c.flavor.translate(query)
-	return c.db.Query(query, args...)
+	return c.db.Query(query, c.translateArgs(args)...)
 }
 
 func (c *conn) QueryRow(query string, args ...interface{}) *sql.Row {
 	query = c.flavor.translate(query)
-	return c.db.QueryRow(query, args...)
+	return c.db.QueryRow(query, c.translateArgs(args)...)
 }
 
 // ExecTx runs a method which operates on a transaction.
@@ -163,15 +185,15 @@ type trans struct {
 
 func (t *trans) Exec(query string, args ...interface{}) (sql.Result, error) {
 	query = t.c.flavor.translate(query)
-	return t.tx.Exec(query, args...)
+	return t.tx.Exec(query, t.c.translateArgs(args)...)
 }
 
 func (t *trans) Query(query string, args ...interface{}) (*sql.Rows, error) {
 	query = t.c.flavor.translate(query)
-	return t.tx.Query(query, args...)
+	return t.tx.Query(query, t.c.translateArgs(args)...)
 }
 
 func (t *trans) QueryRow(query string, args ...interface{}) *sql.Row {
 	query = t.c.flavor.translate(query)
-	return t.tx.QueryRow(query, args...)
+	return t.tx.QueryRow(query, t.c.translateArgs(args)...)
 }

storage/storage.go

@@ -44,11 +44,9 @@ type GCResult struct {
 	AuthCodes    int64
 }
 
-// Storage is the storage interface used by the server. Implementations, at minimum
+// Storage is the storage interface used by the server. Implementations are
-// require compare-and-swap atomic actions.
+// required to be able to perform atomic compare-and-swap updates and either
-//
+// support timezones or standardize on UTC.
-// Implementations are expected to perform their own garbage collection of
-// expired objects (expect keys, which are handled by the server).
 type Storage interface {
 	Close() error