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// Copyright 2024 OpenPubkey
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0
package mocks
import (
"crypto/rand"
"encoding/hex"
"encoding/json"
"fmt"
"strings"
"sync"
"time"
"github.com/openpubkey/openpubkey/cosigner"
"github.com/openpubkey/openpubkey/pktoken"
)
// This is intended for testing purposes. The locking strategy used is not
// particularly efficient. Anyone building a Cosigner should use the interface
// above to replace this in-memory store with a database.
type AuthStateInMemoryStore struct {
AuthIDIssuer *cosigner.AuthIDIssuer
AuthStateMap map[string]*cosigner.AuthState
AuthCodeMap map[string]string
AuthStateMapLock sync.RWMutex
AuthcodeMapLock sync.RWMutex
}
func NewAuthStateInMemoryStore(hmacKey []byte) *AuthStateInMemoryStore {
return &AuthStateInMemoryStore{
AuthStateMap: make(map[string]*cosigner.AuthState),
AuthCodeMap: make(map[string]string),
AuthcodeMapLock: sync.RWMutex{},
AuthStateMapLock: sync.RWMutex{},
AuthIDIssuer: cosigner.NewAuthIDIssuer(hmacKey),
}
}
// Writes to the AuthState are not concurrency safe, do not write
func (s *AuthStateInMemoryStore) LookupAuthState(authID string) (*cosigner.AuthState, bool) {
s.AuthStateMapLock.RLock()
as, ok := s.AuthStateMap[authID]
s.AuthStateMapLock.RUnlock()
return as, ok // Pass by value to prevent writes to the original
}
func (s *AuthStateInMemoryStore) UpdateAuthState(authID string, authState cosigner.AuthState) error {
s.AuthStateMapLock.Lock()
defer s.AuthStateMapLock.Unlock()
if _, ok := s.AuthStateMap[authID]; !ok {
return fmt.Errorf("failed to upload auth session because authID specified matches no session")
} else {
s.AuthStateMap[authID] = &authState
return nil
}
}
func (s *AuthStateInMemoryStore) CreateNewAuthSession(pkt *pktoken.PKToken, ruri string, nonce string) (string, error) {
var claims struct {
Issuer string `json:"iss"`
Aud any `json:"aud"`
Sub string `json:"sub"`
Email string `json:"email"`
}
if err := json.Unmarshal(pkt.Payload, &claims); err != nil {
return "", fmt.Errorf("failed to unmarshal PK Token: %w", err)
}
// An audience can be a string or an array of strings.
//
// RFC-7519 JSON Web Token (JWT) says:
// "In the general case, the "aud" value is an array of case-
// sensitive strings, each containing a StringOrURI value. In the
// special case when the JWT has one audience, the "aud" value MAY be a
// single case-sensitive string containing a StringOrURI value."
// https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.3
var audience string
switch t := claims.Aud.(type) {
case string:
audience = t
case []any:
audList := []string{}
for _, v := range t {
audList = append(audList, v.(string))
}
audience = strings.Join(audList, ",")
default:
return "", fmt.Errorf("failed to deserialize aud (audience) claim in ID Token: %T", t)
}
authState := &cosigner.AuthState{
Pkt: pkt,
Issuer: claims.Issuer,
Aud: audience,
Sub: claims.Sub,
Username: claims.Email,
DisplayName: strings.Split(claims.Email, "@")[0], //TODO: Use full name from ID Token
RedirectURI: ruri,
Nonce: nonce,
AuthcodeRedeemed: false,
AuthcodeIssued: false,
}
if authID, err := s.AuthIDIssuer.CreateAuthID(uint64(time.Now().Unix())); err != nil {
return "", err
} else {
s.AuthStateMapLock.Lock()
if _, ok := s.AuthStateMap[authID]; ok {
return "", fmt.Errorf("specified authID is already in use")
}
s.AuthStateMap[authID] = authState
s.AuthStateMapLock.Unlock()
return authID, nil
}
}
func (s *AuthStateInMemoryStore) CreateAuthcode(authID string) (string, error) {
authCodeBytes := make([]byte, 32)
if _, err := rand.Read(authCodeBytes); err != nil {
return "", err
}
authcode := hex.EncodeToString(authCodeBytes)
// We take a full read write lock here to ensure we don't issue an authcode twice for the same session
s.AuthStateMapLock.Lock()
defer s.AuthStateMapLock.Unlock()
if authState, ok := s.AuthStateMap[authID]; !ok {
return "", fmt.Errorf("no such authID")
} else if authState.AuthcodeIssued {
return "", fmt.Errorf("authcode already issued for this authID")
} else {
s.AuthcodeMapLock.Lock()
defer s.AuthcodeMapLock.Unlock()
if _, ok := s.AuthCodeMap[authcode]; ok {
return "", fmt.Errorf("authcode collision implies randomness failure in RNG")
}
authState.AuthcodeIssued = true
s.AuthCodeMap[authcode] = authID
return authcode, nil
}
}
func (s *AuthStateInMemoryStore) RedeemAuthcode(authcode string) (cosigner.AuthState, string, error) {
s.AuthcodeMapLock.RLock()
authID, authcodeFound := s.AuthCodeMap[authcode]
s.AuthcodeMapLock.RUnlock()
if !authcodeFound {
return cosigner.AuthState{}, "", fmt.Errorf("invalid authcode")
} else {
s.AuthStateMapLock.Lock()
defer s.AuthStateMapLock.Unlock()
authState := s.AuthStateMap[authID]
if !authState.AuthcodeIssued {
// This should never happen
return cosigner.AuthState{}, "", fmt.Errorf("no authcode issued for this authID")
}
if authState.AuthcodeRedeemed {
return cosigner.AuthState{}, "", fmt.Errorf("authcode has already been redeemed")
}
authState.AuthcodeRedeemed = true
return *authState, authID, nil
}
}
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