feat: add TLS for node bridge

apps/macos/Sources/Clawdbot/NodeMode/MacNodeBridgeTLS.swift

@@ -0,0 +1,75 @@
+import CryptoKit
+import Foundation
+import Network
+import Security
+
+struct MacNodeBridgeTLSParams: Sendable {
+    let required: Bool
+    let expectedFingerprint: String?
+    let allowTOFU: Bool
+    let storeKey: String?
+}
+
+enum MacNodeBridgeTLSStore {
+    private static let suiteName = "com.clawdbot.shared"
+    private static let keyPrefix = "mac.node.bridge.tls."
+
+    private static var defaults: UserDefaults {
+        UserDefaults(suiteName: suiteName) ?? .standard
+    }
+
+    static func loadFingerprint(stableID: String) -> String? {
+        let key = keyPrefix + stableID
+        let raw = defaults.string(forKey: key)?.trimmingCharacters(in: .whitespacesAndNewlines)
+        return raw?.isEmpty == false ? raw : nil
+    }
+
+    static func saveFingerprint(_ value: String, stableID: String) {
+        let key = keyPrefix + stableID
+        defaults.set(value, forKey: key)
+    }
+}
+
+func makeMacNodeTLSOptions(_ params: MacNodeBridgeTLSParams?) -> NWProtocolTLS.Options? {
+    guard let params else { return nil }
+    let options = NWProtocolTLS.Options()
+    let expected = params.expectedFingerprint.map(normalizeMacNodeFingerprint)
+    let allowTOFU = params.allowTOFU
+    let storeKey = params.storeKey
+
+    sec_protocol_options_set_verify_block(
+        options.securityProtocolOptions,
+        { _, trust, complete in
+            guard let trust else {
+                complete(false)
+                return
+            }
+            if let cert = SecTrustGetCertificateAtIndex(trust, 0) {
+                let data = SecCertificateCopyData(cert) as Data
+                let fingerprint = sha256Hex(data)
+                if let expected {
+                    complete(fingerprint == expected)
+                    return
+                }
+                if allowTOFU {
+                    if let storeKey { MacNodeBridgeTLSStore.saveFingerprint(fingerprint, stableID: storeKey) }
+                    complete(true)
+                    return
+                }
+            }
+            let ok = SecTrustEvaluateWithError(trust, nil)
+            complete(ok)
+        },
+        DispatchQueue(label: "com.clawdbot.macos.bridge.tls.verify"))
+
+    return options
+}
+
+private func sha256Hex(_ data: Data) -> String {
+    let digest = SHA256.hash(data: data)
+    return digest.map { String(format: "%02x", $0) }.joined()
+}
+
+private func normalizeMacNodeFingerprint(_ raw: String) -> String {
+    raw.lowercased().filter { $0.isHexDigit }
+}