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assertion_replay.go
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assertion_replay.go
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/*
* Teleport
* Copyright (C) 2023 Gravitational, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package local
import (
"context"
"time"
"github.com/gravitational/trace"
"github.com/gravitational/teleport/lib/backend"
)
const assertionReplayPrefix = "recognized_assertions"
// AssertionReplayService tracks used SSO assertions to mitigate replay attacks.
// Assertions are automatically derecognized when their signed expiry passes.
type AssertionReplayService struct {
bk backend.Backend
}
// NewAssertionReplayService creates a new instance of AssertionReplayService.
func NewAssertionReplayService(bk backend.Backend) *AssertionReplayService {
return &AssertionReplayService{bk: bk}
}
// RecognizeSSOAssertion will remember a new assertion until it becomes invalid.
// This will error with `trace.AlreadyExists` if the assertion has been previously recognized.
//
// `safeAfter` must be either at or after the point in time that a given SSO assertion becomes invalid in order to mitigate replay attacks.
// This function shouldn't be used if the assertion never verifiably expires.
func (s *AssertionReplayService) RecognizeSSOAssertion(ctx context.Context, connectorID string, assertionID string, user string, safeAfter time.Time) error {
key := backend.Key(assertionReplayPrefix, connectorID, assertionID)
item := backend.Item{Key: key, Value: []byte(user), Expires: safeAfter}
_, err := s.bk.Create(ctx, item)
switch {
case trace.IsAlreadyExists(err):
return trace.AlreadyExists("Assertion %q already recognized for user %v", assertionID, user)
case err != nil:
return trace.Wrap(err)
default:
return nil
}
}