chengcheng
d345c070ae
使用 AES-256-GCM 保存认证中心令牌，并以随机 Cookie 哈希关联 PostgreSQL 会话。加入闲置与绝对期限、Refresh Token 轮换以及多实例刷新锁。
83 lines
2.2 KiB
Go
83 lines
2.2 KiB
Go
package oidcsession
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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)
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type TokenBundle struct {
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AccessToken string `json:"accessToken"`
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RefreshToken string `json:"refreshToken"`
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IDToken string `json:"idToken,omitempty"`
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}
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type Cipher struct {
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aead cipher.AEAD
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}
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func NewCipher(key []byte) (*Cipher, error) {
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if len(key) != 32 {
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return nil, errors.New("OIDC session encryption key must be exactly 32 bytes")
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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aead, err := cipher.NewGCM(block)
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if err != nil {
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return nil, err
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}
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return &Cipher{aead: aead}, nil
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}
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func (c *Cipher) EncryptBundle(bundle TokenBundle, sessionID, gatewayUserID string) ([]byte, error) {
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return c.SealJSON(bundle, tokenAAD(sessionID, gatewayUserID))
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}
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func (c *Cipher) SealJSON(value any, aad []byte) ([]byte, error) {
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plaintext, err := json.Marshal(value)
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if err != nil {
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return nil, err
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}
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nonce := make([]byte, c.aead.NonceSize())
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if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
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return nil, err
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}
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return c.aead.Seal(nonce, nonce, plaintext, aad), nil
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}
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func (c *Cipher) DecryptBundle(encrypted []byte, sessionID, gatewayUserID string) (TokenBundle, error) {
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var bundle TokenBundle
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if err := c.OpenJSON(encrypted, tokenAAD(sessionID, gatewayUserID), &bundle); err != nil {
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return TokenBundle{}, err
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}
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if bundle.AccessToken == "" || bundle.RefreshToken == "" {
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return TokenBundle{}, errors.New("OIDC session token bundle is invalid")
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}
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return bundle, nil
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}
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func (c *Cipher) OpenJSON(encrypted, aad []byte, output any) error {
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if len(encrypted) <= c.aead.NonceSize() {
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return errors.New("OIDC session ciphertext is invalid")
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}
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nonce, ciphertext := encrypted[:c.aead.NonceSize()], encrypted[c.aead.NonceSize():]
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plaintext, err := c.aead.Open(nil, nonce, ciphertext, aad)
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if err != nil {
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return errors.New("OIDC session ciphertext authentication failed")
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}
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if err := json.Unmarshal(plaintext, output); err != nil {
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return errors.New("OIDC session ciphertext payload is invalid")
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}
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return nil
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}
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func tokenAAD(sessionID, gatewayUserID string) []byte {
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return []byte(fmt.Sprintf("easyai-gateway/oidc-session/v1\x00%s\x00%s", sessionID, gatewayUserID))
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}
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