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feat: (android) Support pinning on the certificate chain #78

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feat: (android) Support pinning on the certificate chain #78

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33 changes: 19 additions & 14 deletions android/src/main/kotlin/diefferson/http_certificate_pinning/HttpCertificatePinningPlugin.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -95,23 +95,28 @@ public class HttpCertificatePinningPlugin : FlutterPlugin, MethodCallHandler {


private fun checkConnexion(serverURL: String, allowedFingerprints: List<String>, httpHeaderArgs: Map<String, String>, timeout: Int, type: String): Boolean {
val sha: String = this.getFingerprint(serverURL, timeout, httpHeaderArgs, type)
return allowedFingerprints.map { fp -> fp.toUpperCase().replace("\\s".toRegex(), "") }.contains(sha)
}

@Throws(IOException::class, NoSuchAlgorithmException::class, CertificateException::class, CertificateEncodingException::class, SocketTimeoutException::class)
private fun getFingerprint(httpsURL: String, connectTimeout: Int, httpHeaderArgs: Map<String, String>, type: String): String {
val fingerprints: Set<String> = this.getFingerprints(serverURL, timeout, httpHeaderArgs, type)
val normalizedAllowedFingerprints = allowedFingerprints.map { fp -> fp.toUpperCase().replace("\\s".toRegex(), "") }

val url = URL(httpsURL)
val httpClient: HttpsURLConnection = url.openConnection() as HttpsURLConnection
if (connectTimeout > 0)
httpClient.connectTimeout = connectTimeout * 1000
httpHeaderArgs.forEach { (key, value) -> httpClient.setRequestProperty(key, value) }
// Check if at least one fingerprint matches the allowed list
return fingerprints.any { fingerprint -> normalizedAllowedFingerprints.contains(fingerprint) }
}

httpClient.connect()

val cert: Certificate = httpClient.serverCertificates[0] as Certificate
return this.hashString(type, cert.encoded)
@Throws(IOException::class, NoSuchAlgorithmException::class, CertificateException::class, CertificateEncodingException::class, SocketTimeoutException::class)
private fun getFingerprints(httpsURL: String, connectTimeout: Int, httpHeaderArgs: Map<String, String>, type: String): Set<String> {
val url = URL(httpsURL)
val httpClient: HttpsURLConnection = url.openConnection() as HttpsURLConnection
if (connectTimeout > 0)
httpClient.connectTimeout = connectTimeout * 1000
httpHeaderArgs.forEach { (key, value) -> httpClient.setRequestProperty(key, value) }

httpClient.connect()

val fingerprints = httpClient.serverCertificates.map { cert ->
this.hashString(type, (cert as Certificate).encoded)
}.toSet() // Convert the list to a set to remove duplicates
return fingerprints
}

private fun hashString(type: String, input: ByteArray) =
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