mirror of
https://github.com/coder/coder.git
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Zach
85984ff142
Users can now disable a secret to stop it from being injected into workspaces without deleting it, and re-enable it later. Disabled secrets stay visible and editable everywhere they already appear. An enabled secret must have at least one injection target; a secret with no target can be stored only while disabled. Existing target-less secrets are migrated to disabled to preserve current behavior. Support spans the REST API, SDK, CLI, dashboard, and audit log.
478 lines
20 KiB
Go
478 lines
20 KiB
Go
package dbcrypt
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import (
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"context"
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"database/sql"
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"strings"
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"golang.org/x/xerrors"
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"cdr.dev/slog/v3"
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"github.com/coder/coder/v2/coderd/database"
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)
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// Rotate rotates the database encryption keys by re-encrypting all user tokens
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// with the first cipher and revoking all other ciphers.
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func Rotate(ctx context.Context, log slog.Logger, sqlDB *sql.DB, ciphers []Cipher) error {
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db := database.New(sqlDB)
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cryptDB, err := New(ctx, db, ciphers...)
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if err != nil {
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return xerrors.Errorf("create cryptdb: %w", err)
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}
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userIDs, err := db.AllUserIDs(ctx, false)
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if err != nil {
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return xerrors.Errorf("get users: %w", err)
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}
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log.Info(ctx, "encrypting user tokens", slog.F("user_count", len(userIDs)))
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for idx, uid := range userIDs {
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err := cryptDB.InTx(func(cryptTx database.Store) error {
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userLinks, err := cryptTx.GetUserLinksByUserID(ctx, uid)
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if err != nil {
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return xerrors.Errorf("get user links for user: %w", err)
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}
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for _, userLink := range userLinks {
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if userLink.OAuthAccessTokenKeyID.String == ciphers[0].HexDigest() && userLink.OAuthRefreshTokenKeyID.String == ciphers[0].HexDigest() {
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log.Debug(ctx, "skipping user link", slog.F("user_id", uid), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
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continue
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}
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if _, err := cryptTx.UpdateUserLink(ctx, database.UpdateUserLinkParams{
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OAuthAccessToken: userLink.OAuthAccessToken,
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OAuthAccessTokenKeyID: sql.NullString{}, // dbcrypt will update as required
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OAuthRefreshToken: userLink.OAuthRefreshToken,
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OAuthRefreshTokenKeyID: sql.NullString{}, // dbcrypt will update as required
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OAuthExpiry: userLink.OAuthExpiry,
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UserID: uid,
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LoginType: userLink.LoginType,
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Claims: userLink.Claims,
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}); err != nil {
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return xerrors.Errorf("update user link user_id=%s linked_id=%s: %w", userLink.UserID, userLink.LinkedID, err)
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}
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}
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externalAuthLinks, err := cryptTx.GetExternalAuthLinksByUserID(ctx, uid)
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if err != nil {
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return xerrors.Errorf("get git auth links for user: %w", err)
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}
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for _, externalAuthLink := range externalAuthLinks {
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if externalAuthLink.OAuthAccessTokenKeyID.String == ciphers[0].HexDigest() && externalAuthLink.OAuthRefreshTokenKeyID.String == ciphers[0].HexDigest() {
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log.Debug(ctx, "skipping external auth link", slog.F("user_id", uid), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
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continue
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}
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if _, err := cryptTx.UpdateExternalAuthLink(ctx, database.UpdateExternalAuthLinkParams{
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ProviderID: externalAuthLink.ProviderID,
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UserID: uid,
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UpdatedAt: externalAuthLink.UpdatedAt,
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OAuthAccessToken: externalAuthLink.OAuthAccessToken,
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OAuthAccessTokenKeyID: sql.NullString{}, // dbcrypt will update as required
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OAuthRefreshToken: externalAuthLink.OAuthRefreshToken,
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OAuthRefreshTokenKeyID: sql.NullString{}, // dbcrypt will update as required
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OAuthExpiry: externalAuthLink.OAuthExpiry,
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OAuthExtra: externalAuthLink.OAuthExtra,
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}); err != nil {
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return xerrors.Errorf("update external auth link user_id=%s provider_id=%s: %w", externalAuthLink.UserID, externalAuthLink.ProviderID, err)
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}
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}
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userSecrets, err := cryptTx.ListUserSecretsWithValues(ctx, uid)
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if err != nil {
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return xerrors.Errorf("get user secrets for user %s: %w", uid, err)
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}
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for _, secret := range userSecrets {
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if secret.ValueKeyID.Valid && secret.ValueKeyID.String == ciphers[0].HexDigest() {
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log.Debug(ctx, "skipping user secret", slog.F("user_id", uid), slog.F("secret_name", secret.Name), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
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continue
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}
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if _, err := cryptTx.UpdateUserSecretByUserIDAndName(ctx, database.UpdateUserSecretByUserIDAndNameParams{
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UserID: uid,
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Name: secret.Name,
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UpdateValue: true,
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Value: secret.Value,
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ValueKeyID: sql.NullString{}, // dbcrypt will re-encrypt
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UpdateDescription: false,
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Description: "",
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UpdateEnvName: false,
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EnvName: "",
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UpdateFilePath: false,
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FilePath: "",
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UpdateEnabled: false,
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Enabled: false,
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}); err != nil {
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return xerrors.Errorf("rotate user secret user_id=%s name=%s: %w", uid, secret.Name, err)
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}
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log.Debug(ctx, "rotated user secret", slog.F("user_id", uid), slog.F("secret_name", secret.Name), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
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}
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sshKey, err := cryptTx.GetGitSSHKey(ctx, uid)
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if err != nil && !xerrors.Is(err, sql.ErrNoRows) {
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return xerrors.Errorf("get gitsshkey for user %s: %w", uid, err)
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}
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if err == nil {
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switch {
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case sshKey.PrivateKey == "":
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// Post-Delete wipes the private_key and key_id; nothing to encrypt.
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log.Debug(ctx, "skipping empty gitsshkey", slog.F("user_id", uid), slog.F("current", idx+1))
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case sshKey.PrivateKeyKeyID.Valid && sshKey.PrivateKeyKeyID.String == ciphers[0].HexDigest():
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log.Debug(ctx, "skipping gitsshkey", slog.F("user_id", uid), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
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default:
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if _, err := cryptTx.UpdateGitSSHKey(ctx, database.UpdateGitSSHKeyParams{
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UserID: uid,
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UpdatedAt: sshKey.UpdatedAt,
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PrivateKey: sshKey.PrivateKey,
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PrivateKeyKeyID: sql.NullString{}, // dbcrypt will re-encrypt
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PublicKey: sshKey.PublicKey,
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}); err != nil {
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return xerrors.Errorf("rotate gitsshkey user_id=%s: %w", uid, err)
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}
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log.Debug(ctx, "rotated gitsshkey", slog.F("user_id", uid), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
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}
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}
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return nil
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}, &database.TxOptions{
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Isolation: sql.LevelRepeatableRead,
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})
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if err != nil {
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return xerrors.Errorf("update user tokens and chat provider keys: %w", err)
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}
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log.Debug(ctx, "encrypted user tokens", slog.F("user_id", uid), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
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}
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aiProviders, err := cryptDB.GetAIProviders(ctx, database.GetAIProvidersParams{IncludeDeleted: true, IncludeDisabled: true})
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if err != nil {
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return xerrors.Errorf("get ai providers: %w", err)
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}
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log.Info(ctx, "encrypting ai provider settings", slog.F("provider_count", len(aiProviders)))
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for idx, ap := range aiProviders {
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if !ap.Settings.Valid || strings.TrimSpace(ap.Settings.String) == "" {
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continue
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}
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if ap.SettingsKeyID.Valid && ap.SettingsKeyID.String == ciphers[0].HexDigest() {
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log.Debug(ctx, "skipping ai provider", slog.F("ai_provider_id", ap.ID), slog.F("name", ap.Name), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
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continue
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}
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if _, err := cryptDB.UpdateEncryptedAIProviderSettings(ctx, database.UpdateEncryptedAIProviderSettingsParams{
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ID: ap.ID,
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Settings: ap.Settings,
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SettingsKeyID: sql.NullString{}, // dbcrypt will update as required
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}); err != nil {
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return xerrors.Errorf("update ai provider id=%s name=%s: %w", ap.ID, ap.Name, err)
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}
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log.Debug(ctx, "encrypted ai provider settings", slog.F("ai_provider_id", ap.ID), slog.F("name", ap.Name), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
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}
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aiProviderKeys, err := cryptDB.GetAIProviderKeys(ctx, true)
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if err != nil {
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return xerrors.Errorf("get ai provider keys: %w", err)
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}
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log.Info(ctx, "encrypting ai provider keys", slog.F("key_count", len(aiProviderKeys)))
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for idx, apk := range aiProviderKeys {
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if strings.TrimSpace(apk.APIKey) == "" {
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continue
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}
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if apk.ApiKeyKeyID.Valid && apk.ApiKeyKeyID.String == ciphers[0].HexDigest() {
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log.Debug(ctx, "skipping ai provider key", slog.F("ai_provider_key_id", apk.ID), slog.F("provider_id", apk.ProviderID), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
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continue
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}
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if _, err := cryptDB.UpdateEncryptedAIProviderKey(ctx, database.UpdateEncryptedAIProviderKeyParams{
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ID: apk.ID,
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APIKey: apk.APIKey,
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ApiKeyKeyID: sql.NullString{}, // dbcrypt will update as required
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}); err != nil {
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return xerrors.Errorf("update ai provider key id=%s provider_id=%s: %w", apk.ID, apk.ProviderID, err)
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}
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log.Debug(ctx, "encrypted ai provider key", slog.F("ai_provider_key_id", apk.ID), slog.F("provider_id", apk.ProviderID), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
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}
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userAIProviderKeys, err := cryptDB.GetUserAIProviderKeys(ctx)
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if err != nil {
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return xerrors.Errorf("get user ai provider keys: %w", err)
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}
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log.Info(ctx, "encrypting user ai provider keys", slog.F("key_count", len(userAIProviderKeys)))
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for idx, key := range userAIProviderKeys {
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if strings.TrimSpace(key.APIKey) == "" {
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continue
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}
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if key.ApiKeyKeyID.Valid && key.ApiKeyKeyID.String == ciphers[0].HexDigest() {
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log.Debug(ctx, "skipping user ai provider key", slog.F("user_ai_provider_key_id", key.ID), slog.F("ai_provider_id", key.AIProviderID), slog.F("user_id", key.UserID), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
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continue
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}
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if _, err := cryptDB.UpdateEncryptedUserAIProviderKey(ctx, database.UpdateEncryptedUserAIProviderKeyParams{
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ID: key.ID,
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APIKey: key.APIKey,
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ApiKeyKeyID: sql.NullString{}, // dbcrypt will update as required
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}); err != nil {
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return xerrors.Errorf("update user ai provider key id=%s ai_provider_id=%s user_id=%s: %w", key.ID, key.AIProviderID, key.UserID, err)
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}
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log.Debug(ctx, "encrypted user ai provider key", slog.F("user_ai_provider_key_id", key.ID), slog.F("ai_provider_id", key.AIProviderID), slog.F("user_id", key.UserID), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
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}
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// Revoke old keys
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for _, c := range ciphers[1:] {
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if err := db.RevokeDBCryptKey(ctx, c.HexDigest()); err != nil {
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return xerrors.Errorf("revoke key: %w", err)
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}
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log.Info(ctx, "revoked unused key", slog.F("digest", c.HexDigest()))
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}
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return nil
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}
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// Decrypt decrypts all user tokens and revokes all ciphers.
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func Decrypt(ctx context.Context, log slog.Logger, sqlDB *sql.DB, ciphers []Cipher) error {
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db := database.New(sqlDB)
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cdb, err := New(ctx, db, ciphers...)
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if err != nil {
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return xerrors.Errorf("create cryptdb: %w", err)
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}
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// HACK: instead of adding logic to configure the primary cipher, we just
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// set it to the empty string so that it will not encrypt anything.
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cryptDB, ok := cdb.(*dbCrypt)
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if !ok {
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return xerrors.Errorf("developer error: dbcrypt.New did not return *dbCrypt")
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}
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cryptDB.primaryCipherDigest = ""
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userIDs, err := db.AllUserIDs(ctx, false)
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if err != nil {
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return xerrors.Errorf("get users: %w", err)
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}
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log.Info(ctx, "decrypting user tokens", slog.F("user_count", len(userIDs)))
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for idx, uid := range userIDs {
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err := cryptDB.InTx(func(tx database.Store) error {
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userLinks, err := tx.GetUserLinksByUserID(ctx, uid)
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if err != nil {
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return xerrors.Errorf("get user links for user: %w", err)
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}
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for _, userLink := range userLinks {
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if !userLink.OAuthAccessTokenKeyID.Valid && !userLink.OAuthRefreshTokenKeyID.Valid {
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log.Debug(ctx, "skipping user link", slog.F("user_id", uid), slog.F("current", idx+1))
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continue
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}
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if _, err := tx.UpdateUserLink(ctx, database.UpdateUserLinkParams{
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OAuthAccessToken: userLink.OAuthAccessToken,
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OAuthAccessTokenKeyID: sql.NullString{}, // we explicitly want to clear the key id
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OAuthRefreshToken: userLink.OAuthRefreshToken,
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OAuthRefreshTokenKeyID: sql.NullString{}, // we explicitly want to clear the key id
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OAuthExpiry: userLink.OAuthExpiry,
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UserID: uid,
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LoginType: userLink.LoginType,
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Claims: userLink.Claims,
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}); err != nil {
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return xerrors.Errorf("update user link user_id=%s linked_id=%s: %w", userLink.UserID, userLink.LinkedID, err)
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}
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}
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externalAuthLinks, err := tx.GetExternalAuthLinksByUserID(ctx, uid)
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if err != nil {
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return xerrors.Errorf("get git auth links for user: %w", err)
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}
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for _, externalAuthLink := range externalAuthLinks {
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if !externalAuthLink.OAuthAccessTokenKeyID.Valid && !externalAuthLink.OAuthRefreshTokenKeyID.Valid {
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log.Debug(ctx, "skipping external auth link", slog.F("user_id", uid), slog.F("current", idx+1))
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continue
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}
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if _, err := tx.UpdateExternalAuthLink(ctx, database.UpdateExternalAuthLinkParams{
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ProviderID: externalAuthLink.ProviderID,
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UserID: uid,
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UpdatedAt: externalAuthLink.UpdatedAt,
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OAuthAccessToken: externalAuthLink.OAuthAccessToken,
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OAuthAccessTokenKeyID: sql.NullString{}, // we explicitly want to clear the key id
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OAuthRefreshToken: externalAuthLink.OAuthRefreshToken,
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OAuthRefreshTokenKeyID: sql.NullString{}, // we explicitly want to clear the key id
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OAuthExpiry: externalAuthLink.OAuthExpiry,
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OAuthExtra: externalAuthLink.OAuthExtra,
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}); err != nil {
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return xerrors.Errorf("update external auth link user_id=%s provider_id=%s: %w", externalAuthLink.UserID, externalAuthLink.ProviderID, err)
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}
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}
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userSecrets, err := tx.ListUserSecretsWithValues(ctx, uid)
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if err != nil {
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return xerrors.Errorf("get user secrets for user %s: %w", uid, err)
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}
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for _, secret := range userSecrets {
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if !secret.ValueKeyID.Valid {
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log.Debug(ctx, "skipping user secret", slog.F("user_id", uid), slog.F("secret_name", secret.Name), slog.F("current", idx+1))
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continue
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}
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if _, err := tx.UpdateUserSecretByUserIDAndName(ctx, database.UpdateUserSecretByUserIDAndNameParams{
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UserID: uid,
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Name: secret.Name,
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UpdateValue: true,
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Value: secret.Value,
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ValueKeyID: sql.NullString{}, // clear the key ID
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UpdateDescription: false,
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Description: "",
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UpdateEnvName: false,
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EnvName: "",
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UpdateFilePath: false,
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FilePath: "",
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UpdateEnabled: false,
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Enabled: false,
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}); err != nil {
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return xerrors.Errorf("decrypt user secret user_id=%s name=%s: %w", uid, secret.Name, err)
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}
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log.Debug(ctx, "decrypted user secret", slog.F("user_id", uid), slog.F("secret_name", secret.Name), slog.F("current", idx+1))
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}
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sshKey, err := tx.GetGitSSHKey(ctx, uid)
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if err != nil && !xerrors.Is(err, sql.ErrNoRows) {
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return xerrors.Errorf("get gitsshkey for user %s: %w", uid, err)
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}
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if err == nil && sshKey.PrivateKeyKeyID.Valid {
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if _, err := tx.UpdateGitSSHKey(ctx, database.UpdateGitSSHKeyParams{
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UserID: uid,
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UpdatedAt: sshKey.UpdatedAt,
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PrivateKey: sshKey.PrivateKey,
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PrivateKeyKeyID: sql.NullString{}, // clear the key ID
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PublicKey: sshKey.PublicKey,
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}); err != nil {
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return xerrors.Errorf("decrypt gitsshkey user_id=%s: %w", uid, err)
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}
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log.Debug(ctx, "decrypted gitsshkey", slog.F("user_id", uid), slog.F("current", idx+1))
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}
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return nil
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}, &database.TxOptions{
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Isolation: sql.LevelRepeatableRead,
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})
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if err != nil {
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return xerrors.Errorf("update user tokens and chat provider keys: %w", err)
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}
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log.Debug(ctx, "decrypted user tokens", slog.F("user_id", uid), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
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}
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aiProviders, err := cryptDB.GetAIProviders(ctx, database.GetAIProvidersParams{IncludeDeleted: true, IncludeDisabled: true})
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if err != nil {
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return xerrors.Errorf("get ai providers: %w", err)
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}
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log.Info(ctx, "decrypting ai provider settings", slog.F("provider_count", len(aiProviders)))
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for idx, ap := range aiProviders {
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if !ap.SettingsKeyID.Valid {
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log.Debug(ctx, "skipping ai provider", slog.F("ai_provider_id", ap.ID), slog.F("name", ap.Name), slog.F("current", idx+1))
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continue
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}
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if _, err := cryptDB.UpdateEncryptedAIProviderSettings(ctx, database.UpdateEncryptedAIProviderSettingsParams{
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ID: ap.ID,
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Settings: ap.Settings,
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SettingsKeyID: sql.NullString{}, // explicitly clear the key id
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}); err != nil {
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return xerrors.Errorf("decrypt ai provider id=%s name=%s: %w", ap.ID, ap.Name, err)
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}
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log.Debug(ctx, "decrypted ai provider", slog.F("ai_provider_id", ap.ID), slog.F("name", ap.Name), slog.F("current", idx+1))
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}
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aiProviderKeys, err := cryptDB.GetAIProviderKeys(ctx, true)
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if err != nil {
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return xerrors.Errorf("get ai provider keys: %w", err)
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}
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log.Info(ctx, "decrypting ai provider keys", slog.F("key_count", len(aiProviderKeys)))
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for idx, apk := range aiProviderKeys {
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if !apk.ApiKeyKeyID.Valid {
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log.Debug(ctx, "skipping ai provider key", slog.F("ai_provider_key_id", apk.ID), slog.F("provider_id", apk.ProviderID), slog.F("current", idx+1))
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continue
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}
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if _, err := cryptDB.UpdateEncryptedAIProviderKey(ctx, database.UpdateEncryptedAIProviderKeyParams{
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ID: apk.ID,
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APIKey: apk.APIKey,
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ApiKeyKeyID: sql.NullString{}, // explicitly clear the key id
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}); err != nil {
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return xerrors.Errorf("decrypt ai provider key id=%s provider_id=%s: %w", apk.ID, apk.ProviderID, err)
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}
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log.Debug(ctx, "decrypted ai provider key", slog.F("ai_provider_key_id", apk.ID), slog.F("provider_id", apk.ProviderID), slog.F("current", idx+1))
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}
|
|
|
|
userAIProviderKeys, err := cryptDB.GetUserAIProviderKeys(ctx)
|
|
if err != nil {
|
|
return xerrors.Errorf("get user ai provider keys: %w", err)
|
|
}
|
|
log.Info(ctx, "decrypting user ai provider keys", slog.F("key_count", len(userAIProviderKeys)))
|
|
for idx, key := range userAIProviderKeys {
|
|
if !key.ApiKeyKeyID.Valid {
|
|
log.Debug(ctx, "skipping user ai provider key", slog.F("user_ai_provider_key_id", key.ID), slog.F("ai_provider_id", key.AIProviderID), slog.F("user_id", key.UserID), slog.F("current", idx+1))
|
|
continue
|
|
}
|
|
if _, err := cryptDB.UpdateEncryptedUserAIProviderKey(ctx, database.UpdateEncryptedUserAIProviderKeyParams{
|
|
ID: key.ID,
|
|
APIKey: key.APIKey,
|
|
ApiKeyKeyID: sql.NullString{}, // explicitly clear the key id
|
|
}); err != nil {
|
|
return xerrors.Errorf("decrypt user ai provider key id=%s ai_provider_id=%s user_id=%s: %w", key.ID, key.AIProviderID, key.UserID, err)
|
|
}
|
|
log.Debug(ctx, "decrypted user ai provider key", slog.F("user_ai_provider_key_id", key.ID), slog.F("ai_provider_id", key.AIProviderID), slog.F("user_id", key.UserID), slog.F("current", idx+1))
|
|
}
|
|
|
|
// Revoke _all_ keys
|
|
for _, c := range ciphers {
|
|
if err := db.RevokeDBCryptKey(ctx, c.HexDigest()); err != nil {
|
|
return xerrors.Errorf("revoke key: %w", err)
|
|
}
|
|
log.Info(ctx, "revoked unused key", slog.F("digest", c.HexDigest()))
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// nolint: gosec
|
|
const sqlDeleteEncryptedUserTokens = `
|
|
BEGIN;
|
|
DELETE FROM user_links
|
|
WHERE oauth_access_token_key_id IS NOT NULL
|
|
OR oauth_refresh_token_key_id IS NOT NULL;
|
|
DELETE FROM external_auth_links
|
|
WHERE oauth_access_token_key_id IS NOT NULL
|
|
OR oauth_refresh_token_key_id IS NOT NULL;
|
|
DELETE FROM user_ai_provider_keys
|
|
WHERE api_key_key_id IS NOT NULL;
|
|
DELETE FROM user_secrets
|
|
WHERE value_key_id IS NOT NULL;
|
|
-- gitsshkeys has no delete path in product code: rows are inserted on
|
|
-- user creation and only ever mutated by regenerate. dbcrypt's 'delete'
|
|
-- command is the one operation that needs to wipe encrypted content,
|
|
-- and it does so by clearing the value rather than deleting the row,
|
|
-- so users can regenerate via the UI.
|
|
UPDATE gitsshkeys
|
|
SET private_key = '',
|
|
private_key_key_id = NULL
|
|
WHERE private_key_key_id IS NOT NULL;
|
|
UPDATE ai_providers
|
|
SET settings = NULL,
|
|
settings_key_id = NULL
|
|
WHERE settings_key_id IS NOT NULL;
|
|
DELETE FROM ai_provider_keys
|
|
WHERE api_key_key_id IS NOT NULL;
|
|
COMMIT;
|
|
`
|
|
|
|
// Delete deletes all user tokens and revokes all ciphers.
|
|
// This is a destructive operation and should only be used
|
|
// as a last resort, for example, if the database encryption key has been
|
|
// lost.
|
|
func Delete(ctx context.Context, log slog.Logger, sqlDB *sql.DB) error {
|
|
store := database.New(sqlDB)
|
|
_, err := sqlDB.ExecContext(ctx, sqlDeleteEncryptedUserTokens)
|
|
if err != nil {
|
|
return xerrors.Errorf("delete encrypted tokens and AI provider keys: %w", err)
|
|
}
|
|
log.Info(ctx, "deleted encrypted user tokens and AI provider API keys")
|
|
|
|
log.Info(ctx, "revoking all active keys")
|
|
keys, err := store.GetDBCryptKeys(ctx)
|
|
if err != nil {
|
|
return xerrors.Errorf("get db crypt keys: %w", err)
|
|
}
|
|
for _, k := range keys {
|
|
if !k.ActiveKeyDigest.Valid {
|
|
continue
|
|
}
|
|
if err := store.RevokeDBCryptKey(ctx, k.ActiveKeyDigest.String); err != nil {
|
|
return xerrors.Errorf("revoke key: %w", err)
|
|
}
|
|
log.Info(ctx, "revoked unused key", slog.F("digest", k.ActiveKeyDigest.String))
|
|
}
|
|
|
|
return nil
|
|
}
|