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Merge pull request #438 from Kommunicate-io/dev
Release - 7.2.0
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| // | ||
| // KMURLSessionPinning.swift | ||
| // Kommunicate | ||
| // | ||
| // Created by Abhijeet Ranjan on 03/09/24. | ||
| // | ||
|
|
||
| import Foundation | ||
| import KommunicateCore_iOS_SDK | ||
| import CommonCrypto | ||
|
|
||
| class KMURLSessionPinningDelegate: NSObject, URLSessionDelegate { | ||
|
|
||
| let rsa2048Asn1Header:[UInt8] = [ | ||
| 0x30, 0x82, 0x01, 0x22, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, | ||
| 0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x82, 0x01, 0x0f, 0x00 | ||
| ] | ||
|
|
||
| private func sha256(data : Data) -> String { | ||
| var keyWithHeader = Data(rsa2048Asn1Header) | ||
| keyWithHeader.append(data) | ||
| var hash = [UInt8](repeating: 0, count: Int(CC_SHA256_DIGEST_LENGTH)) | ||
| keyWithHeader.withUnsafeBytes { | ||
| _ = CC_SHA256($0.baseAddress, CC_LONG(keyWithHeader.count), &hash) | ||
| } | ||
| return Data(hash).base64EncodedString() | ||
| } | ||
|
|
||
| func fetchExpectedPublicKeyHashes(from bundle: Bundle) -> [String]? { | ||
| if let infoPlist = bundle.infoDictionary, | ||
| let keys = infoPlist["KMExpectedPublicKeyHashBase64"] as? [String] { | ||
| return keys | ||
| } else if let plistPath = bundle.path(forResource: "KommunicateCore-Info", ofType: "plist"), | ||
| let infoPlist = NSDictionary(contentsOfFile: plistPath) as? [String: Any], | ||
| let keys = infoPlist["KMExpectedPublicKeyHashBase64"] as? [String] { | ||
| return keys | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func urlSession(_ session: URLSession, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Swift.Void) { | ||
|
|
||
| if (challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust), | ||
| let bundle = ALUtilityClass.getBundle(), | ||
| let kExpectedPublicKeyHashBase64 = fetchExpectedPublicKeyHashes(from: bundle) { | ||
| if let serverTrust = challenge.protectionSpace.serverTrust { | ||
| var secError: CFError? | ||
| let isTrustValid = SecTrustEvaluateWithError(serverTrust, &secError) | ||
| if (isTrustValid) { | ||
| if let serverCertificate = SecTrustGetCertificateAtIndex(serverTrust, 0) { | ||
| // Public key pinning | ||
| let serverPublicKey = SecCertificateCopyKey(serverCertificate) | ||
| let serverPublicKeyData:NSData = SecKeyCopyExternalRepresentation(serverPublicKey!, nil )! | ||
| let keyHash = sha256(data: serverPublicKeyData as Data) | ||
| if (kExpectedPublicKeyHashBase64.contains(keyHash)) { | ||
| // Success! This is our server | ||
| completionHandler(.useCredential, URLCredential(trust:serverTrust)) | ||
| return | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| // Pinning failed | ||
| completionHandler(.cancelAuthenticationChallenge, nil) | ||
| } | ||
| } | ||
|
|
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