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17 changes: 16 additions & 1 deletion ios/MqttClient.swift
Original file line number Diff line number Diff line change
Expand Up @@ -414,6 +414,8 @@ extension MqttClient : CocoaMQTTDelegate {

func mqtt(_ mqtt: CocoaMQTT, didReceive trust: SecTrust, completionHandler: @escaping (Bool) -> Void) {
var result: SecTrustResultType = .invalid
let trustResultDetailsKey = "TrustResultDetails"
let validityPeriodMaximumsKey = "ValidityPeriodMaximums"

let queryCaCertAttrs: [String: Any] = [
kSecClass as String: kSecClassCertificate,
Expand All @@ -439,12 +441,25 @@ extension MqttClient : CocoaMQTTDelegate {
completionHandler(false)
return
}

switch result {
case .proceed:
completionHandler(true)
case .unspecified:
completionHandler(true)
case .recoverableTrustFailure:
// Check the reason why the certificate is untrusted
let secTrustCopyResult = SecTrustCopyResult(trust)! as NSDictionary
// If TrustResultDetails is in our result we can find the possible issue
if let trustResultDetails = secTrustCopyResult[trustResultDetailsKey] as? NSArray {
// ValidityPeriodMaximums = 0 indicates that the period of validity of the certificate is too short
// The maximum validity is 397 days https://support.apple.com/en-us/HT211025
if trustResultDetails.value(forKey: validityPeriodMaximumsKey) is [NSObject] {
completionHandler(true)
return
}
}
completionHandler(false)
default:
completionHandler(false)
}
Expand Down