WIP Restrictions support

* Add host lookup xpc service

* Remove restriction that snuck in

* Test fixes

.github/workflows/codeql.yml

@@ -11,7 +11,7 @@ on:
 jobs:
   analyze:
     name: Analyze (${{ matrix.language }})
-    runs-on: ${{ (matrix.language == 'swift' && 'macos-26') || 'ubuntu-latest' }}
+    runs-on: ${{ (matrix.language == 'swift' && 'xcode-27') || 'ubuntu-latest' }}
     permissions:
       security-events: write
       packages: read
@@ -24,20 +24,15 @@ jobs:
         include:
         - language: actions
           build-mode: none
-        # Disable this until CodeQL supports Xcode 26 builds.
-        # - language: swift
-        #   build-mode: manual
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v3
       with:
         languages: ${{ matrix.language }}
         build-mode: ${{ matrix.build-mode }}
     - if: matrix.build-mode == 'manual'
-      name: "Select Xcode"
-      run: sudo xcrun xcode-select -s /Applications/Xcode_26.4.app
     - if: matrix.build-mode == 'manual'
       name: "Build"
       run: xcrun xcodebuild -project Sources/Secretive.xcodeproj -scheme Secretive CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO

.github/workflows/nightly.yml

@@ -6,7 +6,7 @@ on:
   
 jobs:
   build:
-    runs-on: macos-26
+    runs-on: xcode-27
     permissions:
       id-token: write
       contents: write
@@ -25,8 +25,6 @@ jobs:
         APPLE_API_KEY_DATA: ${{ secrets.APPLE_API_KEY_DATA }}
         APPLE_API_KEY_ID: ${{ secrets.APPLE_API_KEY_ID }}
       run: ./.github/scripts/signing.sh
-    - name: Set Environment
-      run: sudo xcrun xcode-select -s /Applications/Xcode_26.4.app
     - name: Update Build Number
       env:
         RUN_ID: ${{ github.run_id }}

.github/workflows/oneoff.yml

@@ -5,7 +5,7 @@ on:
   
 jobs:
   build:
-    runs-on: macos-26
+    runs-on: xcode-27
     permissions:
       id-token: write
       contents: write
@@ -24,8 +24,6 @@ jobs:
         APPLE_API_KEY_DATA: ${{ secrets.APPLE_API_KEY_DATA }}
         APPLE_API_KEY_ID: ${{ secrets.APPLE_API_KEY_ID }}
       run: ./.github/scripts/signing.sh
-    - name: Set Environment
-      run: sudo xcrun xcode-select -s /Applications/Xcode_26.4.app
     - name: Update Build Number
       env:
         RUN_ID: ${{ github.run_id }}

.github/workflows/release.yml

@@ -8,7 +8,7 @@ jobs:
   test:
     permissions:
         contents: read
-    runs-on: macos-26
+    runs-on: xcode-27
     timeout-minutes: 10
     steps:
     - uses: actions/checkout@v5
@@ -21,8 +21,6 @@ jobs:
         APPLE_API_KEY_DATA: ${{ secrets.APPLE_API_KEY_DATA }}
         APPLE_API_KEY_ID: ${{ secrets.APPLE_API_KEY_ID }}
       run: ./.github/scripts/signing.sh
-    - name: Set Environment
-      run: sudo xcrun xcode-select -s /Applications/Xcode_26.4.app
     - name: Test
       run: xcrun xcodebuild -project Sources/Secretive.xcodeproj -scheme PackageTests test
       # SPM doesn't seem to pick up on the tests currently?
@@ -34,7 +32,7 @@ jobs:
       attestations: write
       artifact-metadata: write
       actions: read
-    runs-on: macos-26
+    runs-on: xcode-27
     timeout-minutes: 10
     steps:
     - uses: actions/checkout@v5
@@ -47,8 +45,6 @@ jobs:
         APPLE_API_KEY_DATA: ${{ secrets.APPLE_API_KEY_DATA }}
         APPLE_API_KEY_ID: ${{ secrets.APPLE_API_KEY_ID }}
       run: ./.github/scripts/signing.sh
-    - name: Set Environment
-      run: sudo xcrun xcode-select -s /Applications/Xcode_26.4.app
     - name: Update Build Number
       env:
         TAG_NAME: ${{ github.ref }}

.github/workflows/test.yml

@@ -5,12 +5,10 @@ jobs:
   test:
     permissions:
         contents: read
-    runs-on: macos-26
+    runs-on: xcode-27
     timeout-minutes: 10
     steps:
     - uses: actions/checkout@v5
-    - name: Set Environment
-      run: sudo xcrun xcode-select -s /Applications/Xcode_26.4.app
     - name: Test Main Packages
       run: xcrun xcodebuild -project Sources/Secretive.xcodeproj -scheme PackageTests test
       # SPM doesn't seem to pick up on the tests currently?

Sources/Packages/Sources/Brief/Updater.swift

@@ -34,12 +34,12 @@ import XPCWrappers
     ) {
         self.osVersion = osVersion
         self.currentVersion = currentVersion
-        Task {
+        _ = Task {
             if checkOnLaunch {
                 try await checkForUpdates()
             }
-            while !Task.isCancelled {
+            while true {
-                try? await Task.sleep(for: .seconds(Int(checkFrequency)))
+                try await Task.sleep(for: .seconds(Int(checkFrequency)))
                 try await checkForUpdates()
             }
         }

Sources/Packages/Sources/SSHProtocolKit/OpenSSHPublicKeyWriter.swift

@@ -19,7 +19,7 @@ public struct OpenSSHPublicKeyWriter: Sendable {
             ("nistp" + String(describing: secret.keyType.size)).lengthAndData +
             secret.publicKey.lengthAndData
         case .mldsa:
-            // https://www.ietf.org/archive/id/draft-sfluhrer-ssh-mldsa-04.txt
+            // https://datatracker.ietf.org/doc/html/draft-sfluhrer-ssh-mldsa-05
             openSSHIdentifier(for: secret.keyType).lengthAndData +
             secret.publicKey.lengthAndData
         case .rsa:

Sources/Packages/Sources/SSHProtocolKit/OpenSSHReader.swift

@@ -42,6 +42,18 @@ public final class OpenSSHReader {
         return convertEndianness ? T(value.bigEndian) : T(value)
     }
 
+    public func readNextByteAsBool() throws(OpenSSHReaderError) -> Bool {
+        let size = MemoryLayout<Bool>.size
+        guard remaining.count >= size else { throw .beyondBounds }
+        let lengthRange = 0..<size
+        let lengthChunk = remaining[lengthRange]
+        remaining.removeSubrange(lengthRange)
+        if remaining.isEmpty {
+            done = true
+        }
+        return unsafe lengthChunk.bytes.unsafeLoad(as: Bool.self)
+    }
+
     public func readNextChunkAsString(convertEndianness: Bool = true) throws(OpenSSHReaderError) -> String {
         try String(decoding: readNextChunk(convertEndianness: convertEndianness), as: UTF8.self)
     }
@@ -53,5 +65,6 @@ public final class OpenSSHReader {
 }
 
 public enum OpenSSHReaderError: Error, Codable {
+    case incorrectFormat
     case beyondBounds
 }

Sources/Packages/Sources/SSHProtocolKit/OpenSSHSignatureWriter.swift

@@ -17,7 +17,7 @@ public struct OpenSSHSignatureWriter: Sendable {
             // https://datatracker.ietf.org/doc/html/rfc5656#section-3.1
             ecdsaSignature(signature, keyType: secret.keyType)
         case .mldsa:
-            // https://datatracker.ietf.org/doc/html/draft-sfluhrer-ssh-mldsa-00#name-public-key-algorithms
+            // https://datatracker.ietf.org/doc/html/draft-sfluhrer-ssh-mldsa-05
             mldsaSignature(signature, keyType: secret.keyType)
         case .rsa:
             // https://datatracker.ietf.org/doc/html/rfc4253#section-6.6

Sources/Packages/Sources/SSHProtocolKit/SSHAgentInputParser.swift

@@ -3,6 +3,8 @@ import OSLog
 import SecretKit
 import CertificateKit
 
+import CryptoKit
+
 public protocol SSHAgentInputParserProtocol {
 
     func parse(data: Data) async throws -> SSHAgent.Request
@@ -53,8 +55,8 @@ public struct SSHAgentInputParser: SSHAgentInputParserProtocol {
             return .unlock
         case SSHAgent.Request.addSmartcardKeyConstrained.protocolID:
             return .addSmartcardKeyConstrained
-        case SSHAgent.Request.protocolExtension.protocolID:
+        case SSHAgent.Request.protocolExtension(.empty).protocolID:
-            return .protocolExtension
+            return .protocolExtension(try protocolExtension(from: body))
         default:
             return .unknown(rawRequestInt)
         }
@@ -64,12 +66,150 @@ public struct SSHAgentInputParser: SSHAgentInputParserProtocol {
 
 extension SSHAgentInputParser {
 
+    private enum Constants {
+        static let userAuthMagic: UInt8 = 50 // SSH2_MSG_USERAUTH_REQUEST
+        static let sshSigMagic = Data("SSHSIG".utf8)
+    }
+
     func signatureRequestContext(from data: Data) throws(OpenSSHReaderError) -> SSHAgent.Request.SignatureRequestContext {
         let reader = OpenSSHReader(data: data)
         let rawKeyBlob = try reader.readNextChunk()
         let keyBlob = certificatePublicKeyBlob(from: rawKeyBlob) ?? rawKeyBlob
-        let dataToSign = try reader.readNextChunk()
+        let rawPayload = try reader.readNextChunk()
-        return SSHAgent.Request.SignatureRequestContext(keyBlob: keyBlob, dataToSign: dataToSign)
+        let payload: SSHAgent.Request.SignatureRequestContext.SignaturePayload
+        do {
+            if rawPayload.count > 6 && rawPayload[0..<6] == Constants.sshSigMagic {
+                payload = .init(raw: rawPayload, decoded: .sshSig(try sshSigPayload(from: rawPayload[6...])))
+            } else {
+                payload = .init(raw: rawPayload, decoded: .sshConnection(try sshConnectionPayload(from: rawPayload)))
+            }
+        } catch {
+            payload = .init(raw: rawPayload, decoded: nil)
+        }
+        return SSHAgent.Request.SignatureRequestContext(keyBlob: keyBlob, dataToSign: payload)
+    }
+
+    func sshSigPayload(from data: Data) throws(OpenSSHReaderError) -> SSHAgent.Request.SignatureRequestContext.SignaturePayload.DecodedPayload.SSHSigPayload {
+        // https://github.com/openssh/openssh-portable/blob/master/PROTOCOL.sshsig#L79
+        let payloadReader = OpenSSHReader(data: data)
+        let namespace = try payloadReader.readNextChunkAsString()
+        _ = try payloadReader.readNextChunk() // reserved
+        let hashAlgorithm = try payloadReader.readNextChunkAsString()
+        let hash = try payloadReader.readNextChunk()
+        return .init(
+            namespace: namespace,
+            hashAlgorithm: hashAlgorithm,
+            hash: hash
+        )
+    }
+
+    func sshConnectionPayload(from data: Data) throws(OpenSSHReaderError) -> SSHAgent.Request.SignatureRequestContext.SignaturePayload.DecodedPayload.SSHConnectionPayload {
+        let payloadReader = OpenSSHReader(data: data)
+        _ = try payloadReader.readNextChunk()
+        let magic = try payloadReader.readNextBytes(as: UInt8.self, convertEndianness: false)
+        guard magic == Constants.userAuthMagic else { throw .incorrectFormat }
+        let username = try payloadReader.readNextChunkAsString()
+        _ = try payloadReader.readNextChunkAsString() // "ssh-connection"
+        _ = try payloadReader.readNextChunkAsString() // "publickey-hostbound-v00@openssh.com"
+        let hasSignature = try payloadReader.readNextByteAsBool()
+        let algorithm = try payloadReader.readNextChunkAsString()
+        let publicKeyReader = try payloadReader.readNextChunkAsSubReader()
+        _ = try publicKeyReader.readNextChunk()
+        _ = try publicKeyReader.readNextChunk()
+        let publicKey = try publicKeyReader.readNextChunk()
+        let hostKeyReader = try payloadReader.readNextChunkAsSubReader()
+        _ = try hostKeyReader.readNextChunk()
+        let hostKey = try hostKeyReader.readNextChunk()
+        return .init(
+            username: username,
+            hasSignature: hasSignature,
+            publicKeyAlgorithm: algorithm,
+            publicKey: publicKey,
+            hostKey: hostKey,
+        )
+    }
+
+    func protocolExtension(from data: Data) throws(AgentParsingError) -> SSHAgent.ProtocolExtension {
+        do {
+            let reader = OpenSSHReader(data: data)
+            let nameRaw = try reader.readNextChunkAsString()
+            let nameSplit = nameRaw.split(separator: "@")
+            guard nameSplit.count == 2 else {
+                throw AgentParsingError.invalidData
+            }
+            let (name, domain) = (nameSplit[0], nameSplit[1])
+            switch domain {
+            case SSHAgent.ProtocolExtension.OpenSSHExtension.domain:
+                switch name {
+                case SSHAgent.ProtocolExtension.OpenSSHExtension.sessionBind(.empty).name:
+                    let hostkeyBlob = try reader.readNextChunkAsSubReader()
+                    let hostKeyType = try hostkeyBlob.readNextChunkAsString()
+                    let hostKeyData = try hostkeyBlob.readNextChunk()
+                    let sessionID = try reader.readNextChunk()
+                    let signatureBlob = try reader.readNextChunkAsSubReader()
+                    _ = try signatureBlob.readNextChunk() // key type again
+                    let signature = try signatureBlob.readNextChunk()
+                    let forwarding = try reader.readNextByteAsBool()
+                    switch hostKeyType {
+                    case "ssh-ed25519":
+                        let hostKey = try CryptoKit.Curve25519.Signing.PublicKey(rawRepresentation: hostKeyData)
+                        guard hostKey.isValidSignature(signature, for: sessionID) else {
+                            throw AgentParsingError.incorrectSignature
+                        }
+                    case "ecdsa-sha2-nistp256":
+                        let hostKey = try CryptoKit.P256.Signing.PublicKey(rawRepresentation: hostKeyData)
+                        guard hostKey.isValidSignature(try .init(rawRepresentation: signature), for: sessionID) else {
+                            throw AgentParsingError.incorrectSignature
+                        }
+                    case "ecdsa-sha2-nistp384":
+                        let hostKey = try CryptoKit.P384.Signing.PublicKey(rawRepresentation: hostKeyData)
+                        guard hostKey.isValidSignature(try .init(rawRepresentation: signature), for: sessionID) else {
+                            throw AgentParsingError.incorrectSignature
+                        }
+                    case "ssh-mldsa-65":
+                        if #available(macOS 26.0, *) {
+                            let hostKey = try CryptoKit.MLDSA65.PublicKey(rawRepresentation: hostKeyData)
+                            guard hostKey.isValidSignature(signature, for: sessionID) else {
+                                throw AgentParsingError.incorrectSignature
+                            }
+                        } else {
+                            throw AgentParsingError.unhandledRequest
+                        }
+                    case "ssh-mldsa-87":
+                        if #available(macOS 26.0, *) {
+                            let hostKey = try CryptoKit.MLDSA65.PublicKey(rawRepresentation: hostKeyData)
+                            guard hostKey.isValidSignature(signature, for: sessionID) else {
+                                throw AgentParsingError.incorrectSignature
+                            }
+                        } else {
+                            throw AgentParsingError.unhandledRequest
+                        }
+                    case "ssh-rsa":
+                        throw AgentParsingError.unhandledRequest
+                    default:
+                        throw AgentParsingError.unhandledRequest
+                    }
+                    let context = SSHAgent.ProtocolExtension.OpenSSHExtension.SessionBindContext(
+                        hostKey: hostKeyData,
+                        sessionID: sessionID,
+                        signature: signature,
+                        forwarding: forwarding
+                    )
+                    return .openSSH(.sessionBind(context))
+                default:
+                    return .openSSH(.unknown(String(name)))
+                }
+            default:
+                return .unknown(nameRaw)
+            }
+
+        } catch let error as OpenSSHReaderError {
+            throw .openSSHReader(error)
+        } catch let error as AgentParsingError {
+            throw error
+        } catch {
+            throw .unknownRequest
+        }
     }
 
     func certificatePublicKeyBlob(from hash: Data) -> Data? {
@@ -99,6 +239,7 @@ extension SSHAgentInputParser {
         case unknownRequest
         case unhandledRequest
         case invalidData
+        case incorrectSignature
         case openSSHReader(OpenSSHReaderError)
     }
 

Sources/Packages/Sources/SSHProtocolKit/SSHAgentProtocol.swift

@@ -19,7 +19,7 @@ extension SSHAgent {
         case lock
         case unlock
         case addSmartcardKeyConstrained
-        case protocolExtension
+        case protocolExtension(ProtocolExtension)
         case unknown(UInt8)
 
         public var protocolID: UInt8 {
@@ -60,18 +60,82 @@ extension SSHAgent {
 
         public struct SignatureRequestContext: Sendable, Codable {
             public let keyBlob: Data
-            public let dataToSign: Data
+            public let dataToSign: SignaturePayload
 
-            public init(keyBlob: Data, dataToSign: Data) {
+            public init(keyBlob: Data, dataToSign: SignaturePayload) {
                 self.keyBlob = keyBlob
                 self.dataToSign = dataToSign
             }
 
             public static var empty: SignatureRequestContext {
-                SignatureRequestContext(keyBlob: Data(), dataToSign: Data())
+                SignatureRequestContext(keyBlob: Data(), dataToSign: SignaturePayload(raw: Data(), decoded: nil))
+            }
+
+            public struct SignaturePayload: Sendable, Codable {
+
+                public let raw: Data
+                public let decoded: DecodedPayload?
+
+                public init(
+                    raw: Data,
+                    decoded: DecodedPayload?
+                ) {
+                    self.raw = raw
+                    self.decoded = decoded
+                }
+
+                public enum DecodedPayload: Sendable, Codable {
+                    case sshConnection(SSHConnectionPayload)
+                    case sshSig(SSHSigPayload)
+
+                    public struct SSHConnectionPayload: Sendable, Codable {
+
+                        public let username: String
+                        public let hasSignature: Bool
+                        public let publicKeyAlgorithm: String
+                        public let publicKey: Data
+                        public let hostKey: Data
+
+                        public init(
+                            username: String,
+                            hasSignature: Bool,
+                            publicKeyAlgorithm: String,
+                            publicKey: Data,
+                            hostKey: Data
+                        ) {
+                            self.username = username
+                            self.hasSignature = hasSignature
+                            self.publicKeyAlgorithm = publicKeyAlgorithm
+                            self.publicKey = publicKey
+                            self.hostKey = hostKey
+                        }
+
+                    }
+
+                    public struct SSHSigPayload: Sendable, Codable {
+
+                        public let namespace: String
+                        public let hashAlgorithm: String
+                        public let hash: Data
+
+                        public init(
+                            namespace: String,
+                            hashAlgorithm: String,
+                            hash: Data,
+                        ) {
+                            self.namespace = namespace
+                            self.hashAlgorithm = hashAlgorithm
+                            self.hash = hash
+                        }
+
+                    }
+                    
+                }
+
             }
         }
 
+
     }
 
     /// The type of the SSH Agent Response, as described in https://datatracker.ietf.org/doc/html/draft-miller-ssh-agent#section-5.1
@@ -88,8 +152,8 @@ extension SSHAgent {
             switch self {
             case .agentFailure: "SSH_AGENT_FAILURE"
             case .agentSuccess: "SSH_AGENT_SUCCESS"
-            case .agentIdentitiesAnswer: "SSH_AGENT_IDENTITIES_ANSWER"
+            case .agentIdentitiesAnswer: "SSH2_AGENT_IDENTITIES_ANSWER"
-            case .agentSignResponse: "SSH_AGENT_SIGN_RESPONSE"
+            case .agentSignResponse: "SSH2_AGENT_SIGN_RESPONSE"
             case .agentExtensionFailure: "SSH_AGENT_EXTENSION_FAILURE"
             case .agentExtensionResponse: "SSH_AGENT_EXTENSION_RESPONSE"
             }

Sources/Packages/Sources/SSHProtocolKit/SSHProtocolExtensions.swift

@@ -0,0 +1,76 @@
+import Foundation
+
+// Extensions, as defined in https://github.com/openssh/openssh-portable/blob/master/PROTOCOL.agent
+
+extension SSHAgent {
+
+    public enum ProtocolExtension: CustomDebugStringConvertible, Codable, Sendable {
+        case openSSH(OpenSSHExtension)
+        case unknown(String)
+
+        public var debugDescription: String {
+            switch self {
+            case let .openSSH(protocolExtension):
+                protocolExtension.debugDescription
+            case .unknown(let string):
+                "Unknown (\(string))"
+            }
+        }
+
+        public static var empty: ProtocolExtension {
+            .unknown("empty")
+        }
+
+        private struct ProtocolExtensionParsingError: Error {}
+
+    }
+
+}
+
+extension SSHAgent.ProtocolExtension {
+
+    public enum OpenSSHExtension: CustomDebugStringConvertible, Codable, Sendable {
+        case sessionBind(SessionBindContext)
+        case unknown(String)
+
+        public static var domain: String {
+            "openssh.com"
+        }
+
+        public var name: String {
+            switch self {
+            case .sessionBind:
+                "session-bind"
+            case .unknown(let name):
+                name
+            }
+        }
+
+        public var debugDescription: String {
+            "\(name)@\(OpenSSHExtension.domain)"
+        }
+    }
+
+}
+
+extension SSHAgent.ProtocolExtension.OpenSSHExtension {
+
+    public struct SessionBindContext: Codable, Sendable {
+
+        public let hostKey: Data
+        public let sessionID: Data
+        public let signature: Data
+        public let forwarding: Bool
+
+        public init(hostKey: Data, sessionID: Data, signature: Data, forwarding: Bool) {
+            self.hostKey = hostKey
+            self.sessionID = sessionID
+            self.signature = signature
+            self.forwarding = forwarding
+        }
+
+        public static let empty = SessionBindContext(hostKey: Data(), sessionID: Data(), signature: Data(), forwarding: false)
+
+    }
+
+}

Sources/Packages/Sources/SecretAgentKit/Agent.swift

@@ -16,6 +16,8 @@ public final class Agent: Sendable {
     private let signatureWriter = OpenSSHSignatureWriter()
     private let logger = Logger(subsystem: "com.maxgoedjen.secretive.secretagent", category: "Agent")
 
+    @MainActor private var sessionID: SSHAgent.ProtocolExtension.OpenSSHExtension.SessionBindContext?
+
     /// Initializes an agent with a store list and a witness.
     /// - Parameters:
     ///   - storeList: The `SecretStoreList` to make available.
@@ -31,7 +33,12 @@ public final class Agent: Sendable {
 
 extension Agent {
 
-    public func handle(request: SSHAgent.Request, provenance: SigningRequestProvenance) async -> Data {
+    public func handle(
+        request: SSHAgent.Request,
+        provenance: SigningRequestProvenance,
+        hosts: [Data: String]?
+    ) async -> Data {
+        logger.debug("Agent received request of type \(request.debugDescription)")
         // Depending on the launch context (such as after macOS update), the agent may need to reload secrets before acting
         await reloadSecretsIfNeccessary()
         var response = Data()
@@ -42,9 +49,55 @@ extension Agent {
                 response.append(await identities())
                 logger.debug("Agent returned \(SSHAgent.Response.agentIdentitiesAnswer.debugDescription)")
             case .signRequest(let context):
+                let target: SigningRequestTarget?
+                switch context.dataToSign.decoded {
+                case .sshConnection(let payload):
+                    target = .connection(
+                        .init(
+                            username: payload.username,
+                            hasSignature: payload.hasSignature,
+                            publicKeyAlgorithm: payload.publicKeyAlgorithm,
+                            publicKey: payload.publicKey,
+                            hostKey: payload.hostKey,
+                            host: hosts?[payload.hostKey]
+                        )
+                    )
+                    if let boundSession = await sessionID {
+                        guard payload.hostKey == boundSession.hostKey else {
+                            logger.error("Agent received bind request, but host key does not match signature request host key.")
+                            throw BindingFailure()
+                        }
+                    }
+                case .sshSig(let payload):
+                    target = .signature(
+                        .init(
+                            namespace: payload.namespace,
+                            hashAlgorithm: payload.hashAlgorithm,
+                            hash: payload.hash
+                        )
+                    )
+                default:
+                    target = nil
+                }
+                _ = target
                 response.append(SSHAgent.Response.agentSignResponse.data)
-                response.append(try await sign(data: context.dataToSign, keyBlob: context.keyBlob, provenance: provenance))
+                response.append(try await sign(data: context.dataToSign.raw, keyBlob: context.keyBlob, provenance: provenance, target: target))
                 logger.debug("Agent returned \(SSHAgent.Response.agentSignResponse.debugDescription)")
+            case .protocolExtension(.openSSH(.sessionBind(let bind))):
+                // This is disabled until forward enforcement is handled.
+                _ = bind
+                response = try await MainActor.run {
+                    logger.debug("Agent received bind request but not currently supported.")
+                    throw UnhandledRequestError()
+//                    guard sessionID == nil else {
+//                        logger.error("Agent received bind request, but already bound.")
+//                        throw BindingFailure()
+//                    }
+//                    logger.debug("Agent bound")
+//                    sessionID = bind
+//                    return SSHAgent.Response.agentSuccess.data
+                }
+                logger.debug("Agent returned \(SSHAgent.Response.agentSuccess.debugDescription)")
             case .unknown(let value):
                 logger.error("Agent received unknown request of type \(value).")
                 throw UnhandledRequestError()
@@ -92,19 +145,21 @@ extension Agent {
     ///   - data: The data to sign.
     ///   - provenance: A ``SecretKit.SigningRequestProvenance`` object describing the origin of the request.
     /// - Returns: An OpenSSH formatted Data payload containing the signed data response.
-    func sign(data: Data, keyBlob: Data, provenance: SigningRequestProvenance) async throws -> Data {
+    func sign(data: Data, keyBlob: Data, provenance: SigningRequestProvenance, target: SigningRequestTarget?) async throws -> Data {
         guard let (secret, store) = await secret(matching: keyBlob) else {
             let keyBlobHex = keyBlob.formatted(.hex())
             logger.debug("Agent did not have a key matching \(keyBlobHex)")
             throw NoMatchingKeyError()
         }
 
-        try await witness?.speakNowOrForeverHoldYourPeace(forAccessTo: secret, from: store, by: provenance)
+        try evaluateRestrictions(secret.attributes.restrictions, from: provenance, for: target)
 
-        let rawRepresentation = try await store.sign(data: data, with: secret, for: provenance)
+        try await witness?.speakNowOrForeverHoldYourPeace(forAccessTo: secret, from: store, by: provenance, target: target)
+
+        let rawRepresentation = try await store.sign(data: data, with: secret, for: provenance, target: target)
         let signedData = signatureWriter.data(secret: secret, signature: rawRepresentation)
 
-        try await witness?.witness(accessTo: secret, from: store, by: provenance)
+        try await witness?.witness(accessTo: secret, from: store, by: provenance, target: target)
 
         logger.debug("Agent signed request")
 
@@ -113,6 +168,22 @@ extension Agent {
 
 }
 
+extension Agent {
+
+    func evaluateRestrictions(_ restrictions: Restrictions?, from provenance: SigningRequestProvenance, for target: SigningRequestTarget?) throws(RestrictionError) {
+        guard let restrictions else { return }
+        print(restrictions)
+        throw .connectionsNotPermitted
+    }
+
+    enum RestrictionError: Error {
+        case signingNotPermitted
+        case connectionsNotPermitted
+        case hostNotAllowed(String)
+    }
+
+}
+
 extension Agent {
 
     /// Gives any store with no loaded secrets a chance to reload.
@@ -142,6 +213,7 @@ extension Agent {
 
     struct NoMatchingKeyError: Error {}
     struct UnhandledRequestError: Error {}
+    struct BindingFailure: Error {}
 
 }
 

Sources/Packages/Sources/SecretAgentKit/SigningWitness.swift

@@ -1,5 +1,6 @@
 import Foundation
 import SecretKit
+import SSHProtocolKit
 
 /// A protocol that allows conformers to be notified of access to secrets, and optionally prevent access.
 public protocol SigningWitness: Sendable {
@@ -10,13 +11,13 @@ public protocol SigningWitness: Sendable {
     ///   - store: The `Store` being asked to sign the request..
     ///   - provenance: A `SigningRequestProvenance` object describing the origin of the request.
     ///   - Note: This method being called does not imply that the requst has been authorized. If a secret requires authentication, authentication will still need to be performed by the user before the request will be performed. If the user declines or fails to authenticate, the request will fail.
-    func speakNowOrForeverHoldYourPeace(forAccessTo secret: AnySecret, from store: AnySecretStore, by provenance: SigningRequestProvenance) async throws
+    func speakNowOrForeverHoldYourPeace(forAccessTo secret: AnySecret, from store: AnySecretStore, by provenance: SigningRequestProvenance, target: SigningRequestTarget?) async throws
 
     /// Notifies the callee that a signing operation has been performed for a given secret.
     /// - Parameters:
     ///   - secret: The `Secret` that will was used to sign the request.
     ///   - store: The `Store` that signed the request..
     ///   - provenance: A `SigningRequestProvenance` object describing the origin of the request.
-    func witness(accessTo secret: AnySecret, from store: AnySecretStore, by provenance: SigningRequestProvenance) async throws
+    func witness(accessTo secret: AnySecret, from store: AnySecretStore, by provenance: SigningRequestProvenance, target: SigningRequestTarget?) async throws
 
 }

Sources/Packages/Sources/SecretAgentKit/SocketController.swift

@@ -94,7 +94,7 @@ extension SocketController {
                     guard !data.isEmpty else {
                         logger.debug("Socket controller received empty data, ending continuation.")
                         messagesContinuation.finish()
-                        try fileHandle.close()
+                        try? fileHandle.close()
                         return
                     }
                     messagesContinuation.yield(data)
@@ -126,8 +126,8 @@ private extension SocketPort {
     convenience init(path: String) {
         var addr = sockaddr_un()
 
-        let length = unsafe withUnsafeMutablePointer(to: &addr.sun_path.0) { pointer in
+        let length = withUnsafeMutablePointer(to: &addr.sun_path.0) { pointer in
-            unsafe path.withCString { cstring in
+            path.withCString { cstring in
                 let len = unsafe strlen(cstring)
                 unsafe strncpy(pointer, cstring, len)
                 return len

Sources/Packages/Sources/SecretKit/Erasers/AnySecretStore.swift

@@ -8,7 +8,7 @@ open class AnySecretStore: SecretStore, @unchecked Sendable {
     private let _id: @Sendable () -> UUID
     private let _name: @MainActor @Sendable () -> String
     private let _secrets: @MainActor @Sendable () -> [AnySecret]
-    private let _sign: @Sendable (Data, AnySecret, SigningRequestProvenance) async throws -> Data
+    private let _sign: @Sendable (Data, AnySecret, SigningRequestProvenance, SigningRequestTarget?) async throws -> Data
     private let _existingPersistedAuthenticationContext: @Sendable (AnySecret) async -> PersistedAuthenticationContext?
     private let _persistAuthentication: @Sendable (AnySecret, TimeInterval) async throws -> Void
     private let _reloadSecrets: @Sendable () async -> Void
@@ -19,7 +19,7 @@ open class AnySecretStore: SecretStore, @unchecked Sendable {
         _name = { secretStore.name }
         _id = { secretStore.id }
         _secrets = { secretStore.secrets.map { AnySecret($0) } }
-        _sign = { try await secretStore.sign(data: $0, with: $1.base as! SecretStoreType.SecretType, for: $2) }
+        _sign = { try await secretStore.sign(data: $0, with: $1.base as! SecretStoreType.SecretType, for: $2, target: $3) }
         _existingPersistedAuthenticationContext = { await secretStore.existingPersistedAuthenticationContext(secret: $0.base as! SecretStoreType.SecretType) }
         _persistAuthentication = { try await secretStore.persistAuthentication(secret: $0.base as! SecretStoreType.SecretType, forDuration: $1) }
         _reloadSecrets = { await secretStore.reloadSecrets() }
@@ -41,8 +41,8 @@ open class AnySecretStore: SecretStore, @unchecked Sendable {
         return _secrets()
     }
 
-    public func sign(data: Data, with secret: AnySecret, for provenance: SigningRequestProvenance) async throws -> Data {
+    public func sign(data: Data, with secret: AnySecret, for provenance: SigningRequestProvenance, target: SigningRequestTarget?) async throws -> Data {
-        try await _sign(data, secret, provenance)
+        try await _sign(data, secret, provenance, target)
     }
 
     public func existingPersistedAuthenticationContext(secret: AnySecret) async -> PersistedAuthenticationContext? {

Sources/Packages/Sources/SecretKit/Types/CreationOptions.swift

@@ -8,6 +8,9 @@ public struct Attributes: Sendable, Codable, Hashable {
     /// The authentication requirements for the key. This is simply a description of the option recorded at creation – modifying it doers not modify the key's authentication requirements.
     public let authentication: AuthenticationRequirement
 
+    /// The authentication restrictions for the key.
+    public var restrictions: Restrictions?
+
     /// The string appended to the end of the SSH Public Key.
     /// If nil, a default value will be used.
     public var publicKeyAttribution: String?
@@ -15,10 +18,12 @@ public struct Attributes: Sendable, Codable, Hashable {
     public init(
         keyType: KeyType,
         authentication: AuthenticationRequirement,
+        restrictions: Restrictions?,
         publicKeyAttribution: String? = nil
     ) {
         self.keyType = keyType
         self.authentication = authentication
+        self.restrictions = restrictions
         self.publicKeyAttribution = publicKeyAttribution
     }
 
@@ -53,3 +58,46 @@ public enum AuthenticationRequirement: String, Hashable, Sendable, Codable, Iden
         self
     }
 }
+
+/// The restrictions for the key.
+public struct Restrictions: Hashable, Sendable, Codable, Identifiable {
+
+    public enum AllowedDomains: Hashable, Sendable, Codable {
+        case all
+        case specific([String])
+
+        public func hash(into hasher: inout Hasher) {
+            switch self {
+            case .all:
+                break
+            case .specific(let values):
+                values.hash(into: &hasher)
+            }
+        }
+
+    }
+
+    public enum AllowedProvenancePaths: Hashable, Sendable, Codable, Identifiable {
+        case all
+        case specific([String])
+
+        public var id: Int {
+            hashValue
+        }
+        
+    }
+
+    public var allowForwarding: Bool
+    public var allowSigning: Bool
+    public var allowConnections: Bool
+    public var allowedDomains: AllowedDomains
+    public var allowedProvenancePaths: AllowedProvenancePaths
+
+    public var id: Restrictions {
+        self
+    }
+
+//    public static let `default` = Restrictions(allowForwarding: true, allowSigning: true, allowConnections: true, allowedDomains: .all, allowedProvenancePaths: .all)
+    public static let `default` = Restrictions(allowForwarding: true, allowSigning: true, allowConnections: true, allowedDomains: .specific(["example.com"]), allowedProvenancePaths: .all)
+
+}

Sources/Packages/Sources/SecretKit/Types/SecretStore.swift

@@ -20,7 +20,7 @@ public protocol SecretStore<SecretType>: Identifiable, Sendable {
     ///   - secret: The ``Secret`` to sign with.
     ///   - provenance: A ``SigningRequestProvenance`` describing where the request came from.
     /// - Returns: The signed data.
-    func sign(data: Data, with secret: SecretType, for provenance: SigningRequestProvenance) async throws -> Data
+    func sign(data: Data, with secret: SecretType, for provenance: SigningRequestProvenance, target: SigningRequestTarget?) async throws -> Data
 
     /// Checks to see if there is currently a valid persisted authentication for a given secret.
     /// - Parameters:

Sources/Packages/Sources/SecretKit/Types/SigningRequestTarget.swift

@@ -0,0 +1,55 @@
+import Foundation
+import AppKit
+
+/// Describes the target of the signature operation.
+public enum SigningRequestTarget: Sendable {
+
+    case connection(ConnectionPayload)
+    case signature(SignaturePayload)
+
+    public struct ConnectionPayload: Sendable, Codable{
+
+        public let username: String
+        public let hasSignature: Bool
+        public let publicKeyAlgorithm: String
+        public let publicKey: Data
+        public let hostKey: Data
+        public let host: String?
+
+        public init(
+            username: String,
+            hasSignature: Bool,
+            publicKeyAlgorithm: String,
+            publicKey: Data,
+            hostKey: Data,
+            host: String?
+        ) {
+            self.username = username
+            self.hasSignature = hasSignature
+            self.publicKeyAlgorithm = publicKeyAlgorithm
+            self.publicKey = publicKey
+            self.hostKey = hostKey
+            self.host = host
+        }
+
+    }
+
+    public struct SignaturePayload: Sendable, Codable {
+
+        public let namespace: String
+        public let hashAlgorithm: String
+        public let hash: Data
+
+        public init(
+            namespace: String,
+            hashAlgorithm: String,
+            hash: Data,
+        ) {
+            self.namespace = namespace
+            self.hashAlgorithm = hashAlgorithm
+            self.hash = hash
+        }
+
+    }
+
+}

Sources/Packages/Sources/SecureEnclaveSecretKit/CryptoKitMigrator.swift

@@ -47,7 +47,7 @@ extension SecureEnclave {
                     .contains("DeviceOwnerAuthentication") ? .presenceRequired : .unknown
                 do {
                     let parsed = try CryptoKit.SecureEnclave.P256.Signing.PrivateKey(dataRepresentation: tokenObjectID)
-                    let secret = Secret(id: UUID().uuidString, name: name, publicKey: parsed.publicKey.x963Representation, attributes: Attributes(keyType: .init(algorithm: .ecdsa, size: 256), authentication: auth))
+                    let secret = Secret(id: UUID().uuidString, name: name, publicKey: parsed.publicKey.x963Representation, attributes: Attributes(keyType: .init(algorithm: .ecdsa, size: 256), authentication: auth, restrictions: .default))
                     guard !migratedPublicKeys.contains(parsed.publicKey.x963Representation) else {
                         logger.log("Skipping \(name), public key already present. Marking as migrated.")
                         markMigrated(secret: secret, oldID: id)

Sources/Packages/Sources/SecureEnclaveSecretKit/SecureEnclaveStore.swift

@@ -37,13 +37,20 @@ extension SecureEnclave {
         
         // MARK: SecretStore
         
-        public func sign(data: Data, with secret: Secret, for provenance: SigningRequestProvenance) async throws -> Data {
+        public func sign(data: Data, with secret: Secret, for provenance: SigningRequestProvenance, target: SigningRequestTarget?) async throws -> Data {
             var context: LAContext
             if let existing = await persistentAuthenticationHandler.existingPersistedAuthenticationContext(secret: secret) {
                 context = unsafe existing.context
             } else {
                 let newContext = LAContext()
-                newContext.localizedReason = String(localized: .authContextRequestSignatureDescription(appName: provenance.origin.displayName, secretName: secret.name))
+                switch target {
+                case .connection(let payload) where payload.host != nil:
+                    newContext.localizedReason = String(localized: .authContextRequestSignatureForConnectionDescription(appName: provenance.origin.displayName, targetName: payload.host!, secretName: secret.name))
+                case .signature(let payload):
+                    newContext.localizedReason = String(localized: .authContextRequestSignatureForSignatureDescription(namespace: payload.namespace, appName: provenance.origin.displayName, secretName: secret.name))
+                default:
+                    newContext.localizedReason = String(localized: .authContextRequestSignatureDescription(appName: provenance.origin.displayName, secretName: secret.name))
+                }
                 newContext.localizedCancelTitle = String(localized: .authContextRequestDenyButton)
                 context = newContext
             }

Sources/Packages/Sources/SmartCardSecretKit/SmartCardSecret.swift

@@ -10,6 +10,7 @@ extension SmartCard {
         public let name: String
         public let publicKey: Data
         public var attributes: Attributes
+        public var restrictions: Restrictions?
 
     }
 

Sources/Packages/Sources/SmartCardSecretKit/SmartCardStore.swift

@@ -57,7 +57,7 @@ extension SmartCard {
 
         // MARK: Public API
 
-        public func sign(data: Data, with secret: Secret, for provenance: SigningRequestProvenance) async throws -> Data {
+        public func sign(data: Data, with secret: Secret, for provenance: SigningRequestProvenance, target: SigningRequestTarget?) async throws -> Data {
             guard let tokenID = await state.tokenID else { fatalError() }
             var context: LAContext
             if let existing = await persistentAuthenticationHandler.existingPersistedAuthenticationContext(secret: secret) {
@@ -171,7 +171,7 @@ extension SmartCard.Store {
             let publicKeySecRef = SecKeyCopyPublicKey(publicKeyRef)!
             let publicKeyAttributes = SecKeyCopyAttributes(publicKeySecRef) as! [CFString: Any]
             let publicKey = publicKeyAttributes[kSecValueData] as! Data
-            let attributes = Attributes(keyType: KeyType(secAttr: algorithmSecAttr, size: keySize)!, authentication: .presenceRequired)
+            let attributes = Attributes(keyType: KeyType(secAttr: algorithmSecAttr, size: keySize)!, authentication: .presenceRequired, restrictions: .default)
             let secret = SmartCard.Secret(id: tokenID, name: name, publicKey: publicKey, attributes: attributes)
             guard signatureAlgorithm(for: secret) != nil else { return nil }
             return secret

Sources/Packages/Sources/XPCWrappers/TeamID.swift

@@ -1,26 +0,0 @@
-import Foundation
-
-extension ProcessInfo {
-    private static let fallbackTeamID = "Z72PRUAWF6"
-
-    private static let teamID: String = {
-        #if DEBUG
-        guard let task = SecTaskCreateFromSelf(nil) else {
-            assertionFailure("SecTaskCreateFromSelf failed")
-            return fallbackTeamID
-        }
-
-        guard let value = SecTaskCopyValueForEntitlement(task, "com.apple.developer.team-identifier" as CFString, nil) as? String else {
-            assertionFailure("SecTaskCopyValueForEntitlement(com.apple.developer.team-identifier) failed")
-            return fallbackTeamID
-        }
-
-        return value
-        #else
-        /// Always use hardcoded team ID for release builds, just in case.
-        return fallbackTeamID
-        #endif
-    }()
-
-    public var teamID: String { Self.teamID }
-}

Sources/Packages/Sources/XPCWrappers/XPCServiceDelegate.swift

@@ -12,7 +12,9 @@ public final class XPCServiceDelegate: NSObject, NSXPCListenerDelegate {
         newConnection.exportedInterface = NSXPCInterface(with: (any _XPCProtocol).self)
         let exportedObject = exportedObject
         newConnection.exportedObject = exportedObject
-        newConnection.setCodeSigningRequirement("anchor apple generic and certificate leaf[subject.OU] = \"\(ProcessInfo.processInfo.teamID)\"")
+#if !DEBUG
+        newConnection.setCodeSigningRequirement("anchor apple generic and certificate leaf[subject.OU] = \"Z72PRUAWF6\"")
+#endif
         newConnection.resume()
         return true
     }

Sources/Packages/Sources/XPCWrappers/XPCTypedSession.swift

@@ -8,7 +8,9 @@ public struct XPCTypedSession<ResponseType: Codable & Sendable, ErrorType: Error
     public init(serviceName: String, warmup: Bool = false) async throws {
         let connection = NSXPCConnection(serviceName: serviceName)
         connection.remoteObjectInterface = NSXPCInterface(with: (any _XPCProtocol).self)
-        connection.setCodeSigningRequirement("anchor apple generic and certificate leaf[subject.OU] = \"\(ProcessInfo.processInfo.teamID)\"")
+        #if !DEBUG
+        connection.setCodeSigningRequirement("anchor apple generic and certificate leaf[subject.OU] = \"Z72PRUAWF6\"")
+        #endif
         connection.resume()
         guard let proxy = connection.remoteObjectProxy as? _XPCProtocol else { fatalError() }
         self.connection = connection

Sources/Packages/Tests/SecretAgentKitTests/AgentTests.swift

@@ -13,7 +13,7 @@ import CertificateKit
     @Test func emptyStores() async throws {
         let agent = Agent(storeList: SecretStoreList(), certificateStore: CertificateStore())
         let request = try SSHAgentInputParser().parse(data: Constants.Requests.requestIdentities)
-        let response = await agent.handle(request: request, provenance: .test)
+        let response = await agent.handle(request: request, provenance: .test, hosts: nil)
         #expect(response == Constants.Responses.requestIdentitiesEmpty)
     }
 
@@ -21,7 +21,7 @@ import CertificateKit
         let list = await storeList(with: [Constants.Secrets.ecdsa256Secret, Constants.Secrets.ecdsa384Secret])
         let agent = Agent(storeList: list, certificateStore: CertificateStore())
         let request = try SSHAgentInputParser().parse(data: Constants.Requests.requestIdentities)
-        let response = await agent.handle(request: request, provenance: .test)
+        let response = await agent.handle(request: request, provenance: .test, hosts: nil)
 
         let actual = OpenSSHReader(data: response)
         let expected = OpenSSHReader(data: Constants.Responses.requestIdentitiesMultiple)
@@ -35,7 +35,7 @@ import CertificateKit
         let list = await storeList(with: [Constants.Secrets.ecdsa256Secret, Constants.Secrets.ecdsa384Secret])
         let agent = Agent(storeList: list, certificateStore: CertificateStore())
         let request = try SSHAgentInputParser().parse(data: Constants.Requests.requestSignatureWithNoneMatching)
-        let response = await agent.handle(request: request, provenance: .test)
+        let response = await agent.handle(request: request, provenance: .test, hosts: nil)
         #expect(response == Constants.Responses.requestFailure)
     }
 
@@ -44,7 +44,7 @@ import CertificateKit
         guard case SSHAgent.Request.signRequest(let context) = request else { return }
         let list = await storeList(with: [Constants.Secrets.ecdsa256Secret, Constants.Secrets.ecdsa384Secret])
         let agent = Agent(storeList: list, certificateStore: CertificateStore())
-        let response = await agent.handle(request: request, provenance: .test)
+        let response = await agent.handle(request: request, provenance: .test, hosts: nil)
         let responseReader = OpenSSHReader(data: response)
         let length = try responseReader.readNextBytes(as: UInt32.self)
         let type = try responseReader.readNextBytes(as: UInt8.self)
@@ -68,7 +68,7 @@ import CertificateKit
         let signature = try P256.Signing.ECDSASignature(rawRepresentation: rs)
         // Correct signature
         #expect(try P256.Signing.PublicKey(x963Representation: Constants.Secrets.ecdsa256Secret.publicKey)
-            .isValidSignature(signature, for: context.dataToSign))
+            .isValidSignature(signature, for: context.dataToSign.raw))
     }
 
     // MARK: Witness protocol
@@ -79,7 +79,7 @@ import CertificateKit
             return true
         }, witness: { _, _ in })
         let agent = Agent(storeList: list, certificateStore: CertificateStore(), witness: witness)
-        let response = await agent.handle(request: .signRequest(.empty), provenance: .test)
+        let response = await agent.handle(request: .signRequest(.empty), provenance: .test, hosts: nil)
         #expect(response == Constants.Responses.requestFailure)
     }
 
@@ -93,7 +93,7 @@ import CertificateKit
         })
         let agent = Agent(storeList: list, certificateStore: CertificateStore(), witness: witness)
         let request = try SSHAgentInputParser().parse(data: Constants.Requests.requestSignature)
-        _ = await agent.handle(request: request, provenance: .test)
+        _ = await agent.handle(request: request, provenance: .test, hosts: nil)
         #expect(witnessed)
     }
 
@@ -109,7 +109,7 @@ import CertificateKit
         })
         let agent = Agent(storeList: list, certificateStore: CertificateStore(), witness: witness)
         let request = try SSHAgentInputParser().parse(data: Constants.Requests.requestSignature)
-        _ = await agent.handle(request: request, provenance: .test)
+        _ = await agent.handle(request: request, provenance: .test, hosts: nil)
         #expect(witnessTrace == speakNowTrace)
         #expect(witnessTrace == .test)
     }
@@ -122,7 +122,7 @@ import CertificateKit
         store.shouldThrow = true
         let agent = Agent(storeList: list, certificateStore: CertificateStore())
         let request = try SSHAgentInputParser().parse(data: Constants.Requests.requestSignature)
-        let response = await agent.handle(request: request, provenance: .test)
+        let response = await agent.handle(request: request, provenance: .test, hosts: nil)
         #expect(response == Constants.Responses.requestFailure)
     }
 
@@ -130,7 +130,7 @@ import CertificateKit
 
     @Test func unhandledAdd() async throws {
         let agent = Agent(storeList: SecretStoreList(), certificateStore: CertificateStore())
-        let response = await agent.handle(request: .addIdentity, provenance: .test)
+        let response = await agent.handle(request: .addIdentity, provenance: .test, hosts: nil)
         #expect(response == Constants.Responses.requestFailure)
     }
 

Sources/Packages/Tests/SecretAgentKitTests/StubStore.swift

@@ -49,7 +49,7 @@ extension Stub {
             print("Public Key OpenSSH: \(OpenSSHPublicKeyWriter().openSSHString(secret: secret))")
         }
 
-        public func sign(data: Data, with secret: Secret, for provenance: SigningRequestProvenance) throws -> Data {
+        public func sign(data: Data, with secret: Secret, for provenance: SigningRequestProvenance, target: SigningRequestTarget?) throws -> Data {
             guard !shouldThrow else {
                 throw NSError(domain: "test", code: 0, userInfo: nil)
             }

Sources/Packages/Tests/SecretAgentKitTests/StubWitness.swift

@@ -10,14 +10,14 @@ struct StubWitness {
 
 extension StubWitness: SigningWitness {
 
-func speakNowOrForeverHoldYourPeace(forAccessTo secret: AnySecret, from store: AnySecretStore, by provenance: SigningRequestProvenance) throws {
+    func speakNowOrForeverHoldYourPeace(forAccessTo secret: AnySecret, from store: AnySecretStore, by provenance: SigningRequestProvenance, target: SigningRequestTarget?) throws {
         let objection = speakNow(secret, provenance)
         if objection {
             throw TheresMyChance()
         }
     }
 
-func witness(accessTo secret: AnySecret, from store: AnySecretStore, by provenance: SigningRequestProvenance) throws {
+func witness(accessTo secret: AnySecret, from store: AnySecretStore, by provenance: SigningRequestProvenance, target: SigningRequestTarget?) throws {
         witness(secret, provenance)
     }
 

Sources/SecretAgent/AppDelegate.swift

@@ -52,15 +52,17 @@ class AppDelegate: NSObject, NSApplicationDelegate {
         Task {
             for await session in socketController.sessions {
                 Task {
-                    let inputParser = try await XPCAgentInputParser()
                     do {
+                        let inputParser = try await XPCAgentInputParser()
+                        let hostsReader = try? await XPCHostsfileReader()
+                        let hosts = try? await hostsReader?.read()
                         for await message in session.messages {
                             let request = try await inputParser.parse(data: message)
-                            let agentResponse = await agent.handle(request: request, provenance: session.provenance)
+                            let agentResponse = await agent.handle(request: request, provenance: session.provenance, hosts: hosts)
                             try session.write(agentResponse)
                         }
                     } catch {
-                        try session.close()
+                        try? session.close()
                     }
                 }
             }

Sources/SecretAgent/Notifier.swift

@@ -60,12 +60,19 @@ final class Notifier: Sendable {
         notificationCenter.requestAuthorization(options: .alert) { _, _ in }
     }
 
-    func notify(accessTo secret: AnySecret, from store: AnySecretStore, by provenance: SigningRequestProvenance) async {
+    func notify(accessTo secret: AnySecret, from store: AnySecretStore, by provenance: SigningRequestProvenance, target: SigningRequestTarget?) async {
         await notificationDelegate.state.setPending(secret: secret, store: store)
         let notificationCenter = UNUserNotificationCenter.current()
         let notificationContent = UNMutableNotificationContent()
         notificationContent.title = String(localized: .signedNotificationTitle(appName: provenance.origin.displayName))
-        notificationContent.subtitle = String(localized: .signedNotificationDescription(secretName: secret.name))
+        switch target {
+        case .connection(let payload) where payload.host != nil:
+            notificationContent.subtitle = String(localized: .signedConnectionNotificationDescription(secretName: secret.name, username: payload.username, host: payload.host!))
+        case .signature(let payload):
+            notificationContent.subtitle = String(localized: .signedSignatureNotificationDescription(secretName: secret.name, namespace: payload.namespace))
+        default:
+            notificationContent.subtitle = String(localized: .signedNotificationDescription(secretName: secret.name))
+        }
         notificationContent.userInfo[Constants.persistSecretIDKey] = secret.id.description
         notificationContent.userInfo[Constants.persistStoreIDKey] = store.id.description
         notificationContent.interruptionLevel = .timeSensitive
@@ -100,11 +107,21 @@ final class Notifier: Sendable {
 
 extension Notifier: SigningWitness {
 
-    func speakNowOrForeverHoldYourPeace(forAccessTo secret: AnySecret, from store: AnySecretStore, by provenance: SigningRequestProvenance) async throws {
+    func speakNowOrForeverHoldYourPeace(
+        forAccessTo secret: AnySecret,
+        from store: AnySecretStore,
+        by provenance: SigningRequestProvenance,
+        target: SigningRequestTarget?
+    ) async throws {
     }
 
-    func witness(accessTo secret: AnySecret, from store: AnySecretStore, by provenance: SigningRequestProvenance) async throws {
+    func witness(
-        await notify(accessTo: secret, from: store, by: provenance)
+        accessTo secret: AnySecret,
+        from store: AnySecretStore,
+        by provenance: SigningRequestProvenance,
+        target: SigningRequestTarget?
+    ) async throws {
+        await notify(accessTo: secret, from: store, by: provenance, target: target)
     }
 
 }

Sources/SecretAgent/SecretAgent.entitlements

@@ -16,10 +16,10 @@
 	<string>1</string>
 	<key>com.apple.security.hardened-process.hardened-heap</key>
 	<true/>
-	<key>com.apple.security.smartcard</key>
-	<true/>
 	<key>com.apple.security.hardened-process.platform-restrictions-string</key>
 	<string>2</string>
+	<key>com.apple.security.smartcard</key>
+	<true/>
 	<key>keychain-access-groups</key>
 	<array>
 		<string>$(AppIdentifierPrefix)com.maxgoedjen.Secretive</string>

Sources/SecretAgent/XPCHostsfileReader.swift

@@ -0,0 +1,36 @@
+import Foundation
+import OSLog
+import XPCWrappers
+import OSLog
+
+public final class XPCHostsfileReader {
+
+    private let logger = Logger(subsystem: "com.maxgoedjen.secretive.secretagent", category: "XPCHostsfileReader")
+    private let session: XPCTypedSession<[Data: String], HostsfileReaderError>
+
+    public init() async throws {
+        logger.debug("Creating XPCHostsfileReader")
+        session = try await XPCTypedSession(serviceName: "com.maxgoedjen.Secretive.SecretAgentHostsfileReader", warmup: true)
+        logger.debug("XPCHostsfileReader is warmed up.")
+    }
+
+    public func read() async throws -> [Data: String] {
+        logger.debug("Reading hosts file")
+        defer { logger.debug("Read hosts file") }
+        return try await session.send(Data())
+    }
+
+    deinit {
+        session.complete()
+    }
+
+}
+
+extension XPCHostsfileReader {
+
+    public enum HostsfileReaderError: Error, Codable {
+        case fileDoesNotExist
+        case parseError
+    }
+
+}

Sources/SecretAgentHostsfileReader/Info.plist

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>XPCService</key>
+	<dict>
+		<key>ServiceType</key>
+		<string>Application</string>
+	</dict>
+</dict>
+</plist>

Sources/SecretAgentHostsfileReader/SecretAgentHostsfileReader.entitlements

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.hardened-process</key>
+	<true/>
+	<key>com.apple.security.hardened-process.checked-allocations</key>
+	<true/>
+	<key>com.apple.security.hardened-process.dyld-ro</key>
+	<true/>
+	<key>com.apple.security.hardened-process.enhanced-security-version-string</key>
+	<string>2</string>
+	<key>com.apple.security.hardened-process.hardened-heap</key>
+	<true/>
+	<key>com.apple.security.hardened-process.platform-restrictions-string</key>
+	<string>2</string>
+</dict>
+</plist>

Sources/SecretAgentHostsfileReader/SecretAgentHostsfileReader.swift

@@ -0,0 +1,25 @@
+import Foundation
+import OSLog
+import XPCWrappers
+import SSHProtocolKit
+
+final class SecretAgentHostsfileReader: NSObject, XPCProtocol {
+
+    private let logger = Logger(subsystem: "com.maxgoedjen.secretive.SecretAgentHostsfileReader", category: "SecretAgentHostsfileReader")
+
+    func process(_ data: Data) async throws -> [Data: String] {
+        logger.log("Parsing hostsfile")
+        var result: [Data: String] = [:]
+        for try await line in URL(filePath: NSHomeDirectory().appending("/.ssh/known_hosts")).lines {
+            let split = line.split(separator: " ").map(String.init)
+            guard split.count == 3 else { continue }
+            guard let decoded = Data(base64Encoded: split[2]) else { continue }
+            let reader = OpenSSHReader(data: decoded)
+            _ = try reader.readNextChunk()
+            let key = try reader.readNextChunk()
+            result[key] = split[0]
+        }
+        return result
+    }
+
+}

Sources/SecretAgentHostsfileReader/main.swift

@@ -0,0 +1,7 @@
+import Foundation
+import XPCWrappers
+
+let delegate = XPCServiceDelegate(exportedObject: SecretAgentHostsfileReader())
+let listener = NSXPCListener.service()
+listener.delegate = delegate
+listener.resume()

Sources/Secretive.xcodeproj/project.pbxproj

@@ -30,6 +30,12 @@
 		504788F42E681F6900B4556F /* ToolConfigurationView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 504788F32E681F6900B4556F /* ToolConfigurationView.swift */; };
 		504788F62E68206F00B4556F /* GettingStartedView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 504788F52E68206F00B4556F /* GettingStartedView.swift */; };
 		504789232E697DD300B4556F /* BoxBackgroundStyle.swift in Sources */ = {isa = PBXBuildFile; fileRef = 504789222E697DD300B4556F /* BoxBackgroundStyle.swift */; };
+		505402A03034B692000C3356 /* main.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5054029D3034B692000C3356 /* main.swift */; };
+		505402A13034B692000C3356 /* SecretAgentHostsfileReader.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5054029E3034B692000C3356 /* SecretAgentHostsfileReader.swift */; };
+		505402A33034B787000C3356 /* SecretAgentHostsfileReader.xpc in Embed XPC Services */ = {isa = PBXBuildFile; fileRef = 5054028D3034B5E3000C3356 /* SecretAgentHostsfileReader.xpc */; settings = {ATTRIBUTES = (RemoveHeadersOnCopy, ); }; };
+		505402A73034B7A4000C3356 /* XPCWrappers in Frameworks */ = {isa = PBXBuildFile; productRef = 505402A63034B7A4000C3356 /* XPCWrappers */; };
+		505402AA3034B80E000C3356 /* XPCHostsfileReader.swift in Sources */ = {isa = PBXBuildFile; fileRef = 505402A93034B80E000C3356 /* XPCHostsfileReader.swift */; };
+		505402AC303594D1000C3356 /* SSHProtocolKit in Frameworks */ = {isa = PBXBuildFile; productRef = 505402AB303594D1000C3356 /* SSHProtocolKit */; };
 		50571E0324393C2600F76F6C /* JustUpdatedChecker.swift in Sources */ = {isa = PBXBuildFile; fileRef = 50571E0224393C2600F76F6C /* JustUpdatedChecker.swift */; };
 		505F5EF22FA9635700C45824 /* CertificateKit in Frameworks */ = {isa = PBXBuildFile; productRef = 505F5EF12FA9635700C45824 /* CertificateKit */; };
 		50617D8323FCE48E0099B055 /* App.swift in Sources */ = {isa = PBXBuildFile; fileRef = 50617D8223FCE48E0099B055 /* App.swift */; };
@@ -110,6 +116,13 @@
 			remoteGlobalIDString = 501577BC2E6BC5B4004A37D0;
 			remoteInfo = ReleasesDownloader;
 		};
+		505402A43034B787000C3356 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 50617D7723FCE48D0099B055 /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 5054028C3034B5E3000C3356;
+			remoteInfo = SecretAgentHostsfileReader;
+		};
 		50692D1B2E6FDB880043C7BB /* PBXContainerItemProxy */ = {
 			isa = PBXContainerItemProxy;
 			containerPortal = 50617D7723FCE48D0099B055 /* Project object */;
@@ -174,6 +187,7 @@
 			dstPath = "$(CONTENTS_FOLDER_PATH)/XPCServices";
 			dstSubfolderSpec = 16;
 			files = (
+				505402A33034B787000C3356 /* SecretAgentHostsfileReader.xpc in Embed XPC Services */,
 				50692E6D2E6FFA5F0043C7BB /* SecretiveUpdater.xpc in Embed XPC Services */,
 				50E2052D2FAAB92000402380 /* SecretiveCertificateParser.xpc in Embed XPC Services */,
 				50692E702E6FFA6E0043C7BB /* SecretAgentInputParser.xpc in Embed XPC Services */,
@@ -228,6 +242,12 @@
 		504788F32E681F6900B4556F /* ToolConfigurationView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ToolConfigurationView.swift; sourceTree = "<group>"; };
 		504788F52E68206F00B4556F /* GettingStartedView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GettingStartedView.swift; sourceTree = "<group>"; };
 		504789222E697DD300B4556F /* BoxBackgroundStyle.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BoxBackgroundStyle.swift; sourceTree = "<group>"; };
+		5054028D3034B5E3000C3356 /* SecretAgentHostsfileReader.xpc */ = {isa = PBXFileReference; explicitFileType = "wrapper.xpc-service"; includeInIndex = 0; path = SecretAgentHostsfileReader.xpc; sourceTree = BUILT_PRODUCTS_DIR; };
+		5054029C3034B692000C3356 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		5054029D3034B692000C3356 /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
+		5054029E3034B692000C3356 /* SecretAgentHostsfileReader.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SecretAgentHostsfileReader.swift; sourceTree = "<group>"; };
+		505402A83034B7D2000C3356 /* SecretAgentHostsfileReader.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = SecretAgentHostsfileReader.entitlements; sourceTree = "<group>"; };
+		505402A93034B80E000C3356 /* XPCHostsfileReader.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = XPCHostsfileReader.swift; sourceTree = "<group>"; };
 		50571E0224393C2600F76F6C /* JustUpdatedChecker.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = JustUpdatedChecker.swift; sourceTree = "<group>"; };
 		5059933F2E7A3B5B0092CFFA /* en */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = en; path = en.lproj/Main.storyboard; sourceTree = "<group>"; };
 		50617D7F23FCE48E0099B055 /* Secretive.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Secretive.app; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -290,6 +310,15 @@
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
+		5054028A3034B5E3000C3356 /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				505402AC303594D1000C3356 /* SSHProtocolKit in Frameworks */,
+				505402A73034B7A4000C3356 /* XPCWrappers in Frameworks */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 		50617D7C23FCE48D0099B055 /* Frameworks */ = {
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
@@ -408,6 +437,17 @@
 			path = Views;
 			sourceTree = "<group>";
 		};
+		5054029F3034B692000C3356 /* SecretAgentHostsfileReader */ = {
+			isa = PBXGroup;
+			children = (
+				505402A83034B7D2000C3356 /* SecretAgentHostsfileReader.entitlements */,
+				5054029C3034B692000C3356 /* Info.plist */,
+				5054029D3034B692000C3356 /* main.swift */,
+				5054029E3034B692000C3356 /* SecretAgentHostsfileReader.swift */,
+			);
+			path = SecretAgentHostsfileReader;
+			sourceTree = "<group>";
+		};
 		50617D7623FCE48D0099B055 = {
 			isa = PBXGroup;
 			children = (
@@ -418,6 +458,7 @@
 				50692D272E6FDB8D0043C7BB /* SecretiveUpdater */,
 				50692E662E6FF9E20043C7BB /* SecretAgentInputParser */,
 				50E205262FAAB82700402380 /* SecretiveCertificateParser */,
+				5054029F3034B692000C3356 /* SecretAgentHostsfileReader */,
 				50617D8023FCE48E0099B055 /* Products */,
 				5099A08B240243730062B6F2 /* Frameworks */,
 			);
@@ -431,6 +472,7 @@
 				50692D122E6FDB880043C7BB /* SecretiveUpdater.xpc */,
 				50692E502E6FF9D20043C7BB /* SecretAgentInputParser.xpc */,
 				50E205142FAAB81C00402380 /* SecretiveCertificateParser.xpc */,
+				5054028D3034B5E3000C3356 /* SecretAgentHostsfileReader.xpc */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -529,6 +571,7 @@
 				50020BAF24064869003D4025 /* AppDelegate.swift */,
 				5018F54E24064786002EB505 /* Notifier.swift */,
 				501578122E6C0479004A37D0 /* XPCInputParser.swift */,
+				505402A93034B80E000C3356 /* XPCHostsfileReader.swift */,
 				50E2057F2FAB291E00402380 /* CertificateMigrator.swift */,
 				50A3B79524026B7600D209EA /* Main.storyboard */,
 				50A3B79824026B7600D209EA /* Info.plist */,
@@ -561,6 +604,27 @@
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
+		5054028C3034B5E3000C3356 /* SecretAgentHostsfileReader */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 5054029B3034B5E3000C3356 /* Build configuration list for PBXNativeTarget "SecretAgentHostsfileReader" */;
+			buildPhases = (
+				505402893034B5E3000C3356 /* Sources */,
+				5054028A3034B5E3000C3356 /* Frameworks */,
+				5054028B3034B5E3000C3356 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = SecretAgentHostsfileReader;
+			packageProductDependencies = (
+				505402A63034B7A4000C3356 /* XPCWrappers */,
+				505402AB303594D1000C3356 /* SSHProtocolKit */,
+			);
+			productName = SecretAgentHostsfileReader;
+			productReference = 5054028D3034B5E3000C3356 /* SecretAgentHostsfileReader.xpc */;
+			productType = "com.apple.product-type.xpc-service";
+		};
 		50617D7E23FCE48D0099B055 /* Secretive */ = {
 			isa = PBXNativeTarget;
 			buildConfigurationList = 50617D9D23FCE48E0099B055 /* Build configuration list for PBXNativeTarget "Secretive" */;
@@ -655,6 +719,7 @@
 				50692E6F2E6FFA5F0043C7BB /* PBXTargetDependency */,
 				50692E722E6FFA6E0043C7BB /* PBXTargetDependency */,
 				50E2052F2FAAB92000402380 /* PBXTargetDependency */,
+				505402A53034B787000C3356 /* PBXTargetDependency */,
 			);
 			name = SecretAgent;
 			packageProductDependencies = (
@@ -699,10 +764,13 @@
 			isa = PBXProject;
 			attributes = {
 				BuildIndependentTargetsInParallel = YES;
-				LastSwiftUpdateCheck = 2650;
+				LastSwiftUpdateCheck = 2700;
 				LastUpgradeCheck = 2640;
 				ORGANIZATIONNAME = "Max Goedjen";
 				TargetAttributes = {
+					5054028C3034B5E3000C3356 = {
+						CreatedOnToolsVersion = 27.0;
+					};
 					50617D7E23FCE48D0099B055 = {
 						CreatedOnToolsVersion = 11.3;
 					};
@@ -744,13 +812,21 @@
 				50617D7E23FCE48D0099B055 /* Secretive */,
 				50A3B78924026B7500D209EA /* SecretAgent */,
 				50692D112E6FDB880043C7BB /* SecretiveUpdater */,
-				50692E4F2E6FF9D20043C7BB /* SecretAgentInputParser */,
 				50E205132FAAB81C00402380 /* SecretiveCertificateParser */,
+				50692E4F2E6FF9D20043C7BB /* SecretAgentInputParser */,
+				5054028C3034B5E3000C3356 /* SecretAgentHostsfileReader */,
 			);
 		};
 /* End PBXProject section */
 
 /* Begin PBXResourcesBuildPhase section */
+		5054028B3034B5E3000C3356 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 		50617D7D23FCE48D0099B055 /* Resources */ = {
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
@@ -799,6 +875,15 @@
 /* End PBXResourcesBuildPhase section */
 
 /* Begin PBXSourcesBuildPhase section */
+		505402893034B5E3000C3356 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				505402A03034B692000C3356 /* main.swift in Sources */,
+				505402A13034B692000C3356 /* SecretAgentHostsfileReader.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 		50617D7B23FCE48D0099B055 /* Sources */ = {
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
@@ -868,6 +953,7 @@
 				50020BB024064869003D4025 /* AppDelegate.swift in Sources */,
 				5018F54F24064786002EB505 /* Notifier.swift in Sources */,
 				501578132E6C0479004A37D0 /* XPCInputParser.swift in Sources */,
+				505402AA3034B80E000C3356 /* XPCHostsfileReader.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -892,6 +978,11 @@
 			isa = PBXTargetDependency;
 			targetProxy = 501577D32E6BC5DD004A37D0 /* PBXContainerItemProxy */;
 		};
+		505402A53034B787000C3356 /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			target = 5054028C3034B5E3000C3356 /* SecretAgentHostsfileReader */;
+			targetProxy = 505402A43034B787000C3356 /* PBXContainerItemProxy */;
+		};
 		50692D1C2E6FDB880043C7BB /* PBXTargetDependency */ = {
 			isa = PBXTargetDependency;
 			target = 50692D112E6FDB880043C7BB /* SecretiveUpdater */;
@@ -936,6 +1027,104 @@
 /* End PBXVariantGroup section */
 
 /* Begin XCBuildConfiguration section */
+		505402973034B5E3000C3356 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
+				CODE_SIGN_ENTITLEMENTS = SecretAgentHostsfileReader/SecretAgentHostsfileReader.entitlements;
+				CODE_SIGN_IDENTITY = "Apple Development";
+				CODE_SIGN_STYLE = Automatic;
+				COMBINE_HIDPI_IMAGES = YES;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_TEAM = "$(SECRETIVE_DEVELOPMENT_TEAM)";
+				ENABLE_APP_SANDBOX = NO;
+				ENABLE_ENHANCED_SECURITY = YES;
+				ENABLE_HARDENED_RUNTIME = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = SecretAgentHostsfileReader/Info.plist;
+				INFOPLIST_KEY_CFBundleDisplayName = SecretAgentHostsfileReader;
+				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2026 Max Goedjen. All rights reserved.";
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				MACOSX_DEPLOYMENT_TARGET = 14.0;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = "$(SECRETIVE_BASE_BUNDLE_ID).SecretAgentHostsfileReader";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				REGISTER_APP_GROUPS = YES;
+				SKIP_INSTALL = YES;
+				STRING_CATALOG_GENERATE_SYMBOLS = YES;
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "DEBUG $(inherited)";
+				SWIFT_APPROACHABLE_CONCURRENCY = YES;
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_UPCOMING_FEATURE_MEMBER_IMPORT_VISIBILITY = YES;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Debug;
+		};
+		505402983034B5E3000C3356 /* Test */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
+				CODE_SIGN_ENTITLEMENTS = SecretAgentHostsfileReader/SecretAgentHostsfileReader.entitlements;
+				CODE_SIGN_STYLE = Automatic;
+				COMBINE_HIDPI_IMAGES = YES;
+				CURRENT_PROJECT_VERSION = 1;
+				ENABLE_APP_SANDBOX = NO;
+				ENABLE_ENHANCED_SECURITY = YES;
+				ENABLE_HARDENED_RUNTIME = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = SecretAgentHostsfileReader/Info.plist;
+				INFOPLIST_KEY_CFBundleDisplayName = SecretAgentHostsfileReader;
+				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2026 Max Goedjen. All rights reserved.";
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				MACOSX_DEPLOYMENT_TARGET = 14.0;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = "$(SECRETIVE_BASE_BUNDLE_ID).SecretAgentHostsfileReader";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				REGISTER_APP_GROUPS = YES;
+				SKIP_INSTALL = YES;
+				STRING_CATALOG_GENERATE_SYMBOLS = YES;
+				SWIFT_APPROACHABLE_CONCURRENCY = YES;
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_UPCOMING_FEATURE_MEMBER_IMPORT_VISIBILITY = YES;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Test;
+		};
+		505402993034B5E3000C3356 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
+				CODE_SIGN_ENTITLEMENTS = SecretAgentHostsfileReader/SecretAgentHostsfileReader.entitlements;
+				CODE_SIGN_IDENTITY = "Developer ID Application";
+				CODE_SIGN_STYLE = Automatic;
+				COMBINE_HIDPI_IMAGES = YES;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_TEAM = "$(SECRETIVE_DEVELOPMENT_TEAM)";
+				ENABLE_APP_SANDBOX = NO;
+				ENABLE_ENHANCED_SECURITY = YES;
+				ENABLE_HARDENED_RUNTIME = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = SecretAgentHostsfileReader/Info.plist;
+				INFOPLIST_KEY_CFBundleDisplayName = SecretAgentHostsfileReader;
+				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2026 Max Goedjen. All rights reserved.";
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				MACOSX_DEPLOYMENT_TARGET = 14.0;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = "$(SECRETIVE_BASE_BUNDLE_ID).SecretAgentHostsfileReader";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				REGISTER_APP_GROUPS = YES;
+				SKIP_INSTALL = YES;
+				STRING_CATALOG_GENERATE_SYMBOLS = YES;
+				SWIFT_APPROACHABLE_CONCURRENCY = YES;
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_UPCOMING_FEATURE_MEMBER_IMPORT_VISIBILITY = YES;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Release;
+		};
 		50617D9B23FCE48E0099B055 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 508A58AB241E121B0069DC07 /* Config.xcconfig */;
@@ -1515,6 +1704,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				AUTOMATION_APPLE_EVENTS = NO;
 				CODE_SIGN_ENTITLEMENTS = SecretAgent/SecretAgent.entitlements;
 				CODE_SIGN_STYLE = Manual;
 				COMBINE_HIDPI_IMAGES = YES;
@@ -1533,6 +1723,7 @@
 				ENABLE_RESOURCE_ACCESS_CAMERA = NO;
 				ENABLE_RESOURCE_ACCESS_CONTACTS = NO;
 				ENABLE_RESOURCE_ACCESS_LOCATION = NO;
+				ENABLE_RESOURCE_ACCESS_PHOTO_LIBRARY = NO;
 				ENABLE_RESOURCE_ACCESS_PRINTING = NO;
 				ENABLE_RESOURCE_ACCESS_USB = NO;
 				INFOPLIST_FILE = SecretAgent/Info.plist;
@@ -1544,6 +1735,12 @@
 				MARKETING_VERSION = 1;
 				PRODUCT_BUNDLE_IDENTIFIER = "$(SECRETIVE_BASE_BUNDLE_ID).SecretAgent";
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				RUNTIME_EXCEPTION_ALLOW_DYLD_ENVIRONMENT_VARIABLES = NO;
+				RUNTIME_EXCEPTION_ALLOW_JIT = NO;
+				RUNTIME_EXCEPTION_ALLOW_UNSIGNED_EXECUTABLE_MEMORY = NO;
+				RUNTIME_EXCEPTION_DEBUGGING_TOOL = NO;
+				RUNTIME_EXCEPTION_DISABLE_EXECUTABLE_PAGE_PROTECTION = NO;
+				RUNTIME_EXCEPTION_DISABLE_LIBRARY_VALIDATION = NO;
 			};
 			name = Test;
 		};
@@ -1551,6 +1748,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				AUTOMATION_APPLE_EVENTS = NO;
 				CODE_SIGN_ENTITLEMENTS = SecretAgent/SecretAgent.entitlements;
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;
@@ -1570,6 +1768,7 @@
 				ENABLE_RESOURCE_ACCESS_CAMERA = NO;
 				ENABLE_RESOURCE_ACCESS_CONTACTS = NO;
 				ENABLE_RESOURCE_ACCESS_LOCATION = NO;
+				ENABLE_RESOURCE_ACCESS_PHOTO_LIBRARY = NO;
 				ENABLE_RESOURCE_ACCESS_PRINTING = NO;
 				ENABLE_RESOURCE_ACCESS_USB = NO;
 				INFOPLIST_FILE = SecretAgent/Info.plist;
@@ -1581,6 +1780,12 @@
 				MARKETING_VERSION = 1;
 				PRODUCT_BUNDLE_IDENTIFIER = "$(SECRETIVE_BASE_BUNDLE_ID).SecretAgent";
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				RUNTIME_EXCEPTION_ALLOW_DYLD_ENVIRONMENT_VARIABLES = NO;
+				RUNTIME_EXCEPTION_ALLOW_JIT = NO;
+				RUNTIME_EXCEPTION_ALLOW_UNSIGNED_EXECUTABLE_MEMORY = NO;
+				RUNTIME_EXCEPTION_DEBUGGING_TOOL = NO;
+				RUNTIME_EXCEPTION_DISABLE_EXECUTABLE_PAGE_PROTECTION = NO;
+				RUNTIME_EXCEPTION_DISABLE_LIBRARY_VALIDATION = NO;
 			};
 			name = Debug;
 		};
@@ -1588,6 +1793,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				AUTOMATION_APPLE_EVENTS = NO;
 				CODE_SIGN_ENTITLEMENTS = SecretAgent/SecretAgent.entitlements;
 				CODE_SIGN_IDENTITY = "Developer ID Application";
 				CODE_SIGN_STYLE = Manual;
@@ -1608,6 +1814,7 @@
 				ENABLE_RESOURCE_ACCESS_CAMERA = NO;
 				ENABLE_RESOURCE_ACCESS_CONTACTS = NO;
 				ENABLE_RESOURCE_ACCESS_LOCATION = NO;
+				ENABLE_RESOURCE_ACCESS_PHOTO_LIBRARY = NO;
 				ENABLE_RESOURCE_ACCESS_PRINTING = NO;
 				ENABLE_RESOURCE_ACCESS_USB = NO;
 				INFOPLIST_FILE = SecretAgent/Info.plist;
@@ -1620,6 +1827,12 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "$(SECRETIVE_BASE_BUNDLE_ID).SecretAgent";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "Secretive - Secret Agent";
+				RUNTIME_EXCEPTION_ALLOW_DYLD_ENVIRONMENT_VARIABLES = NO;
+				RUNTIME_EXCEPTION_ALLOW_JIT = NO;
+				RUNTIME_EXCEPTION_ALLOW_UNSIGNED_EXECUTABLE_MEMORY = NO;
+				RUNTIME_EXCEPTION_DEBUGGING_TOOL = NO;
+				RUNTIME_EXCEPTION_DISABLE_EXECUTABLE_PAGE_PROTECTION = NO;
+				RUNTIME_EXCEPTION_DISABLE_LIBRARY_VALIDATION = NO;
 			};
 			name = Release;
 		};
@@ -1634,6 +1847,7 @@
 				CURRENT_PROJECT_VERSION = 1;
 				DEVELOPMENT_TEAM = "$(SECRETIVE_DEVELOPMENT_TEAM)";
 				ENABLE_APP_SANDBOX = YES;
+				ENABLE_ENHANCED_SECURITY = YES;
 				ENABLE_HARDENED_RUNTIME = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu17;
 				GENERATE_INFOPLIST_FILE = YES;
@@ -1665,6 +1879,7 @@
 				COMBINE_HIDPI_IMAGES = YES;
 				CURRENT_PROJECT_VERSION = 1;
 				ENABLE_APP_SANDBOX = YES;
+				ENABLE_ENHANCED_SECURITY = YES;
 				ENABLE_HARDENED_RUNTIME = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu17;
 				GENERATE_INFOPLIST_FILE = YES;
@@ -1698,6 +1913,7 @@
 				DEVELOPMENT_TEAM = "";
 				"DEVELOPMENT_TEAM[sdk=macosx*]" = Z72PRUAWF6;
 				ENABLE_APP_SANDBOX = YES;
+				ENABLE_ENHANCED_SECURITY = YES;
 				ENABLE_HARDENED_RUNTIME = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu17;
 				GENERATE_INFOPLIST_FILE = YES;
@@ -1723,6 +1939,16 @@
 /* End XCBuildConfiguration section */
 
 /* Begin XCConfigurationList section */
+		5054029B3034B5E3000C3356 /* Build configuration list for PBXNativeTarget "SecretAgentHostsfileReader" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				505402973034B5E3000C3356 /* Debug */,
+				505402983034B5E3000C3356 /* Test */,
+				505402993034B5E3000C3356 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 		50617D7A23FCE48D0099B055 /* Build configuration list for PBXProject "Secretive" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
@@ -1826,6 +2052,14 @@
 			isa = XCSwiftPackageProductDependency;
 			productName = Brief;
 		};
+		505402A63034B7A4000C3356 /* XPCWrappers */ = {
+			isa = XCSwiftPackageProductDependency;
+			productName = XPCWrappers;
+		};
+		505402AB303594D1000C3356 /* SSHProtocolKit */ = {
+			isa = XCSwiftPackageProductDependency;
+			productName = SSHProtocolKit;
+		};
 		505F5EF12FA9635700C45824 /* CertificateKit */ = {
 			isa = XCSwiftPackageProductDependency;
 			productName = CertificateKit;

Sources/Secretive.xcodeproj/xcshareddata/xcschemes/Secretive.xcscheme

@@ -87,6 +87,9 @@
             ReferencedContainer = "container:Secretive.xcodeproj">
          </BuildableReference>
       </BuildableProductRunnable>
+      <MetalAPIValidationSettings
+         isEnabled = "No">
+      </MetalAPIValidationSettings>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Debug"

Sources/Secretive/App.swift

@@ -25,7 +25,7 @@ struct Secretive: App {
                         guard !agentLaunchController.developmentBuild else { return }
                         if justUpdatedChecker.justUpdatedBuild || !agentLaunchController.running {
                             // Relaunch the agent, since it'll be running from earlier update still
-                            try await agentLaunchController.forceLaunch()
+                            try? await agentLaunchController.forceLaunch()
                         }
                     }
                 }

Sources/Secretive/Preview Content/PreviewStore.swift

@@ -14,6 +14,7 @@ extension Preview {
             Attributes(
                 keyType: .init(algorithm: .ecdsa, size: 256),
                 authentication: .presenceRequired,
+                restrictions: .default
             )
         }
     }
@@ -38,7 +39,7 @@ extension Preview {
             self.init(secrets: new)
         }
 
-        func sign(data: Data, with secret: Preview.Secret, for provenance: SigningRequestProvenance) throws -> Data {
+        func sign(data: Data, with secret: Preview.Secret, for provenance: SigningRequestProvenance, target: SigningRequestTarget?) throws -> Data {
             return data
         }
 
@@ -82,7 +83,7 @@ extension Preview {
             self.init(secrets: new)
         }
 
-        func sign(data: Data, with secret: Preview.Secret, for provenance: SigningRequestProvenance) throws -> Data {
+        func sign(data: Data, with secret: Preview.Secret, for provenance: SigningRequestProvenance, target: SigningRequestTarget?) throws -> Data {
             return data
         }
 

Sources/Secretive/Views/Secrets/CreateSecretView.swift

@@ -10,8 +10,9 @@ struct CreateSecretView<StoreType: SecretStoreModifiable>: View {
     @State private var name = ""
     @State private var keyAttribution = ""
     @State private var authenticationRequirement: AuthenticationRequirement = .presenceRequired
+    @State private var restrictions: Restrictions = .default
     @State private var keyType: KeyType?
-    @State var advanced = false
+    @State var advanced = true // FIXME: Set back
     @State var errorText: String?
 
     private var authenticationOptions: [AuthenticationRequirement] {
@@ -72,6 +73,7 @@ struct CreateSecretView<StoreType: SecretStoreModifiable>: View {
                     }
                 }
                 if advanced {
+                    SecretRestrictionsView(restrictions: $restrictions)
                     Section {
                         VStack {
                             Picker(.createSecretKeyTypeLabel, selection: $keyType) {
@@ -107,6 +109,8 @@ struct CreateSecretView<StoreType: SecretStoreModifiable>: View {
                                 .font(.subheadline)
                                 .foregroundStyle(.secondary)
                         }
+                    } header: {
+                        Text("Key Properties")
                     }
                 }
                 if let errorText {
@@ -146,6 +150,7 @@ struct CreateSecretView<StoreType: SecretStoreModifiable>: View {
                     attributes: .init(
                         keyType: keyType!,
                         authentication: authenticationRequirement,
+                        restrictions: restrictions,
                         publicKeyAttribution: attribution
                     )
                 )
@@ -158,7 +163,52 @@ struct CreateSecretView<StoreType: SecretStoreModifiable>: View {
     }
 
 }
+struct SecretRestrictionsView: View {
 
-//#Preview {
+    @Binding var restrictions: Restrictions
-//    CreateSecretView(store: Preview.StoreModifiable()) { _ in }
+
-//}
+    struct IdentifiedString: Identifiable {
+        let value: String
+        var id: String { value }
+    }
+
+    var body: some View {
+        Section {
+            Toggle("Allow Forwarding", isOn: $restrictions.allowForwarding)
+            Toggle("Allow Signing Operations", isOn: $restrictions.allowSigning)
+            Toggle("Allow Connection Operations", isOn: $restrictions.allowConnections)
+            Picker(selection: $restrictions.allowedDomains) {
+                Text("All")
+                    .tag(Restrictions.AllowedDomains.all)
+                Text("Specific")
+                    .tag(Restrictions.AllowedDomains.specific([]))
+            } label: {
+                Text("Allowed Domains")
+            }
+        } header: {
+            Text("Restrictions")
+        }
+        if restrictions.allowedDomains != .all {
+            Section {
+                switch restrictions.allowedDomains {
+                case .all:
+                    EmptyView()
+                case .specific(let array):
+                    if restrictions.allowedDomains != .all {
+                        ForEach((array + [""]).map({IdentifiedString(value: $0)})) {
+                            TextField("", text: .constant($0.value), prompt: Text("example.com"))
+                                .labelsHidden()
+                        }
+                    }
+                }
+            } header: {
+                Text("Allowed Domains")
+            }
+        }
+    }
+}
+
+#Preview {
+    CreateSecretView(store: Preview.StoreModifiable()) { _ in }
+        .frame(height: 1000)
+}

Sources/Secretive/Views/Views/AgentStatusView.swift

@@ -101,7 +101,7 @@ struct AgentNotRunningView: View {
                                 guard !loading else { return }
                                 loading = true
                                 Task {
-                                    try await agentLaunchController.forceLaunch()
+                                    try? await agentLaunchController.forceLaunch()
                                     loading = false
 
                                     if !agentLaunchController.running {

Sources/SecretiveCertificateParser/SecretiveCertificateParser.entitlements

@@ -12,11 +12,11 @@
 	<true/>
 	<key>com.apple.security.hardened-process.dyld-ro</key>
 	<true/>
-	<key>com.apple.security.hardened-process.enhanced-security-version</key>
+	<key>com.apple.security.hardened-process.enhanced-security-version-string</key>
-	<integer>1</integer>
+	<string>2</string>
 	<key>com.apple.security.hardened-process.hardened-heap</key>
 	<true/>
-	<key>com.apple.security.hardened-process.platform-restrictions</key>
+	<key>com.apple.security.hardened-process.platform-restrictions-string</key>
-	<integer>2</integer>
+	<string>2</string>
 </dict>
 </plist>