| 1 | package config |
| 2 | |
| 3 | import ( |
| 4 | "crypto/sha256" |
| 5 | "fmt" |
| 6 | "strings" |
| 7 | ) |
| 8 | |
| 9 | const ( |
| 10 | remotePasswordCredentialKind = "PASSWORD" |
| 11 | remotePassphraseCredentialKind = "KEY_PASSPHRASE" |
| 12 | ) |
| 13 | |
| 14 | // CredentialChange is one mutation in the user-global credential store. The |
| 15 | // value is never written into config.toml; only its environment-key reference |
| 16 | // belongs in a RemoteHostEntry. |
| 17 | type CredentialChange struct { |
| 18 | Key string |
| 19 | Value string |
| 20 | Remove bool |
| 21 | } |
| 22 | |
| 23 | type remoteCredentialSnapshot struct { |
| 24 | value string |
| 25 | set bool |
| 26 | } |
| 27 | |
| 28 | // RemotePasswordCredentialEnvName returns the Reasonix-owned credential slot |
| 29 | // for a remote host password without exposing the user-supplied label. |
| 30 | func RemotePasswordCredentialEnvName(hostID string) string { |
| 31 | return remoteCredentialEnvName(hostID, remotePasswordCredentialKind) |
| 32 | } |
| 33 | |
| 34 | // RemotePassphraseCredentialEnvName returns the Reasonix-owned credential slot |
| 35 | // for a remote host private-key passphrase. |
| 36 | func RemotePassphraseCredentialEnvName(hostID string) string { |
| 37 | return remoteCredentialEnvName(hostID, remotePassphraseCredentialKind) |
| 38 | } |
| 39 | |
| 40 | func remoteCredentialEnvName(hostID, kind string) string { |
| 41 | sum := sha256.Sum256([]byte(strings.TrimSpace(hostID))) |
| 42 | return fmt.Sprintf("REASONIX_REMOTE_%X_%s", sum[:8], kind) |
| 43 | } |
| 44 | |
| 45 | // IsGeneratedRemoteCredential reports whether key is a Reasonix-owned slot |
| 46 | // for this host. User-managed/shared environment variables are never deleted. |
| 47 | func IsGeneratedRemoteCredential(hostID, key string) bool { |
| 48 | key = strings.TrimSpace(key) |
| 49 | return key != "" && (key == RemotePasswordCredentialEnvName(hostID) || |
| 50 | key == RemotePassphraseCredentialEnvName(hostID)) |
| 51 | } |
| 52 | |
| 53 | // UnusedGeneratedRemoteCredentialChanges returns deduplicated removals for |
| 54 | // candidates that are no longer referenced by any configured remote host. |
| 55 | func UnusedGeneratedRemoteCredentialChanges(c *Config, candidates []string) []CredentialChange { |
| 56 | if c == nil || len(candidates) == 0 { |
| 57 | return nil |
| 58 | } |
| 59 | used := make(map[string]bool, len(c.Remote.Hosts)*2) |
| 60 | for _, host := range c.Remote.Hosts { |
| 61 | used[strings.TrimSpace(host.PasswordEnv)] = true |
| 62 | used[strings.TrimSpace(host.PassphraseEnv)] = true |
| 63 | } |
| 64 | seen := map[string]bool{} |
| 65 | changes := make([]CredentialChange, 0, len(candidates)) |
| 66 | for _, key := range candidates { |
| 67 | key = strings.TrimSpace(key) |
| 68 | if key == "" || used[key] || seen[key] { |
| 69 | continue |
| 70 | } |
| 71 | seen[key] = true |
| 72 | changes = append(changes, CredentialChange{Key: key, Remove: true}) |
| 73 | } |
| 74 | return changes |
| 75 | } |
| 76 | |
| 77 | // EditUserConfigWithCredentials updates config and its Reasonix-owned secret |
| 78 | // slots as one recoverable operation. Credential writes happen before SaveTo; |
| 79 | // any later failure restores every touched slot, keeping plaintext out of TOML. |
| 80 | func EditUserConfigWithCredentials(mutate func(*Config) ([]CredentialChange, error)) error { |
| 81 | unlock := LockUserConfigEdits() |
| 82 | defer unlock() |
| 83 | path := UserConfigPath() |
| 84 | if strings.TrimSpace(path) == "" { |
| 85 | return fmt.Errorf("cannot resolve user config path") |
| 86 | } |
| 87 | cfg := LoadForEdit(path) |
| 88 | if cfg == nil { |
| 89 | cfg = Default() |
| 90 | } |
| 91 | changes, err := mutate(cfg) |
| 92 | if err != nil { |
| 93 | return err |
| 94 | } |
| 95 | snapshots := map[string]remoteCredentialSnapshot{} |
| 96 | applied := make([]string, 0, len(changes)) |
| 97 | rollback := func() { |
| 98 | seen := map[string]bool{} |
| 99 | for i := len(applied) - 1; i >= 0; i-- { |
| 100 | key := applied[i] |
| 101 | if seen[key] { |
| 102 | continue |
| 103 | } |
| 104 | seen[key] = true |
| 105 | snapshot := snapshots[key] |
| 106 | if snapshot.set { |
| 107 | _, _ = SetCredential(key, snapshot.value) |
| 108 | } else { |
| 109 | _ = RemoveCredential(key) |
| 110 | } |
| 111 | } |
| 112 | } |
| 113 | for _, change := range changes { |
| 114 | change.Key = strings.TrimSpace(change.Key) |
| 115 | if change.Key == "" { |
| 116 | continue |
| 117 | } |
| 118 | if _, ok := snapshots[change.Key]; !ok { |
| 119 | resolved := ResolveCredentialForRootGlobalFirst(".", change.Key) |
| 120 | snapshots[change.Key] = remoteCredentialSnapshot{value: resolved.Value, set: resolved.Set} |
| 121 | } |
| 122 | if change.Remove { |
| 123 | err = RemoveCredential(change.Key) |
| 124 | } else { |
| 125 | _, err = SetCredential(change.Key, change.Value) |
| 126 | } |
| 127 | if err != nil { |
| 128 | rollback() |
| 129 | return fmt.Errorf("update remote credential %s: %w", change.Key, err) |
| 130 | } |
| 131 | applied = append(applied, change.Key) |
| 132 | } |
| 133 | if err := cfg.SaveTo(path); err != nil { |
| 134 | rollback() |
| 135 | return err |
| 136 | } |
| 137 | return nil |
| 138 | } |
| 139 |