Use liblinphone rootCA.pem file for SSO connection

app/src/main/java/org/linphone/core/CorePreferences.kt

@@ -491,6 +491,10 @@ class CorePreferences
     val messageReceivedInVisibleConversationNotificationSound: String
         get() = context.filesDir.absolutePath + "/share/sounds/linphone/incoming_chat.wav"
 
+    @get:AnyThread
+    val rootCaPem: String
+        get() = context.filesDir.absolutePath + "/share/linphone/rootca.pem"
+
     @UiThread
     fun copyAssetsFromPackage() {
         copy("linphonerc_default", configPath)

app/src/main/java/org/linphone/ui/main/sso/viewmodel/SingleSignOnViewModel.kt

@@ -21,10 +21,12 @@ package org.linphone.ui.main.sso.viewmodel
 
 import android.content.Intent
 import androidx.annotation.UiThread
+import androidx.annotation.WorkerThread
+import androidx.core.net.toUri
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.viewModelScope
-import java.io.File
 import kotlinx.coroutines.launch
+import net.openid.appauth.AppAuthConfiguration
 import net.openid.appauth.AuthState
 import net.openid.appauth.AuthorizationException
 import net.openid.appauth.AuthorizationRequest
@@ -42,7 +44,19 @@ import org.linphone.ui.GenericViewModel
 import org.linphone.utils.Event
 import org.linphone.utils.FileUtils
 import org.linphone.utils.TimestampUtils
-import androidx.core.net.toUri
+import java.io.File
+import java.io.FileInputStream
+import java.io.InputStream
+import java.net.HttpURLConnection
+import java.net.URL
+import java.security.KeyStore
+import java.security.SecureRandom
+import java.security.cert.Certificate
+import java.security.cert.CertificateFactory
+import javax.net.ssl.HttpsURLConnection
+import javax.net.ssl.SSLContext
+import javax.net.ssl.SSLSocketFactory
+import javax.net.ssl.TrustManagerFactory
 
 class SingleSignOnViewModel
     @UiThread
@@ -134,6 +148,7 @@ class SingleSignOnViewModel
     private fun singleSignOn() {
         Log.i("$TAG Fetch from issuer [$singleSignOnUrl]")
         operationInProgress.postValue(true)
+
         AuthorizationServiceConfiguration.fetchFromIssuer(
             singleSignOnUrl.toUri(),
             AuthorizationServiceConfiguration.RetrieveConfigurationCallback { serviceConfiguration, ex ->
@@ -177,14 +192,55 @@ class SingleSignOnViewModel
                     authRequestBuilder.setLoginHint(username)
                 }
 
+                val appAuthConfig = AppAuthConfiguration.Builder()
+                    .build()
+
                 val authRequest = authRequestBuilder.build()
-                authService = AuthorizationService(coreContext.context)
+                authService = AuthorizationService(coreContext.context, appAuthConfig)
                 val authIntent = authService.getAuthorizationRequestIntent(authRequest)
                 startAuthIntentEvent.postValue(Event(authIntent))
+            },
+            { uri ->
+                val url = URL(uri.toString())
+                val connection = url.openConnection() as HttpURLConnection
+                if (connection is HttpsURLConnection) {
+                    val socketFactory = getSocketFactory()
+                    if (socketFactory != null) {
+                        Log.i("$TAG Using custom SSL Socket Factory")
+                        connection.setSSLSocketFactory(socketFactory)
+                    }
+                }
+                connection
             }
         )
     }
 
+    @WorkerThread
+    private fun getSocketFactory(): SSLSocketFactory? {
+        val caPath = corePreferences.rootCaPem
+        val caInput: InputStream = FileInputStream(caPath)
+        try {
+            val ca: Certificate? =
+                CertificateFactory.getInstance("X.509").generateCertificate(caInput)
+
+            val keyStore = KeyStore.getInstance(KeyStore.getDefaultType())
+            keyStore.load(null, null)
+            keyStore.setCertificateEntry("ca", ca)
+
+            val tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm())
+            tmf.init(keyStore)
+
+            val sslContext = SSLContext.getInstance("TLS")
+            sslContext.init(null, tmf.trustManagers, SecureRandom())
+
+            Log.i("$TAG Created custom SSL Socket Factory using rootCa file at [$caPath]")
+            return sslContext.socketFactory
+        } catch (ex: Exception) {
+            Log.e("$TAG Failed to created custom SSL Socket Factory: $ex")
+        }
+        return null
+    }
+
     @UiThread
     private fun performRefreshToken() {
         operationInProgress.postValue(true)