| 1 | package store |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "time" |
| 6 | |
| 7 | "gorm.io/gorm" |
| 8 | |
| 9 | "github.com/carlosframework/contra/internal/contra/crypto" |
| 10 | "github.com/carlosframework/contra/internal/contra/model" |
| 11 | ) |
| 12 | |
| 13 | // ReplaceRecoveryWrap swaps an account's recovery branch for a new one: a new |
| 14 | // wrap of RK, and the login public key that goes with it. |
| 15 | // |
| 16 | // # Why this one deletes |
| 17 | // |
| 18 | // Everything else in this package is additive. PROTOCOL.md says the recovery |
| 19 | // code is the exception, and says why: only its wrap is stored, never the |
| 20 | // value, so it cannot be *reprinted* — it can only be *regenerated*. A new |
| 21 | // sheet means a new code, and the old sheet has to stop working, or "reprint" |
| 22 | // would quietly leave two live keys to the vault with one of them lost |
| 23 | // somewhere. The old wrap and the old login key go in the same transaction as |
| 24 | // the new ones arrive. |
| 25 | // |
| 26 | // The copy in front of this says so before the person commits. That is not |
| 27 | // decoration: it is the difference between a feature and a data-loss bug. |
| 28 | // |
| 29 | // # What it does not do |
| 30 | // |
| 31 | // It never touches the passphrase wrap. PROTOCOL.md's rule is that W_pw and |
| 32 | // W_rc are never removed — losing a passkey or a device must not strand |
| 33 | // anybody — so a failure part-way through this must never be able to leave an |
| 34 | // account with no way in. One transaction, and the passphrase branch is not |
| 35 | // in it. |
| 36 | func (s *Store) ReplaceRecoveryWrap(ctx context.Context, accountID, wrapID []byte, |
| 37 | kdfParams string, version uint64, kcv []byte, sealed Sealed, loginPublicKey []byte) error { |
| 38 | if !sealed.valid() || len(kcv) != 16 || len(wrapID) != 16 || len(accountID) != 16 { |
| 39 | return ErrShortField |
| 40 | } |
| 41 | if len(loginPublicKey) != 65 || loginPublicKey[0] != 0x04 { |
| 42 | return ErrShortField |
| 43 | } |
| 44 | |
| 45 | loginID, err := NewID() |
| 46 | if err != nil { |
| 47 | return err |
| 48 | } |
| 49 | |
| 50 | return s.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error { |
| 51 | // Refuse to work on an account that does not exist, rather than |
| 52 | // leaving a wrap belonging to nobody. |
| 53 | var count int64 |
| 54 | if err := tx.Model(&model.Account{}). |
| 55 | Where("id = ?", accountID).Count(&count).Error; err != nil { |
| 56 | return err |
| 57 | } |
| 58 | if count == 0 { |
| 59 | return gorm.ErrRecordNotFound |
| 60 | } |
| 61 | |
| 62 | if err := tx.Where("account_id = ? AND kind = ?", accountID, crypto.ObjectWrapRC). |
| 63 | Delete(&model.Wrap{}).Error; err != nil { |
| 64 | return err |
| 65 | } |
| 66 | if err := tx.Where("account_id = ? AND branch = ?", accountID, "rc"). |
| 67 | Delete(&model.LoginKey{}).Error; err != nil { |
| 68 | return err |
| 69 | } |
| 70 | |
| 71 | now := time.Now().UTC() |
| 72 | if err := tx.Create(&model.Wrap{ |
| 73 | ID: wrapID, |
| 74 | AccountID: accountID, |
| 75 | Kind: crypto.ObjectWrapRC, |
| 76 | FormatVersion: FormatVersion, |
| 77 | Version: version, |
| 78 | KDFParams: kdfParams, |
| 79 | KCV: kcv, |
| 80 | Nonce: sealed.Nonce, |
| 81 | Ciphertext: sealed.Ciphertext, |
| 82 | CreatedAt: now, |
| 83 | }).Error; err != nil { |
| 84 | return err |
| 85 | } |
| 86 | return tx.Create(&model.LoginKey{ |
| 87 | ID: loginID, |
| 88 | AccountID: accountID, |
| 89 | Branch: "rc", |
| 90 | PublicKey: loginPublicKey, |
| 91 | CreatedAt: now, |
| 92 | }).Error |
| 93 | }) |
| 94 | } |
| 95 | |
amadan