android – Как установить доверенный сертификат ЦС на Android-устройство? –

Введение сертификата безопасности оказалось тестом. что говорит о сертификате закон и как его удалить с различных устройств?

4 метода обхода верификации ssl-сертификатов в android

 <?xml version="1.0"  encoding="utf-8"?>
  <network-security-config>
  <base-config>
  <trust-anchors>
  <certificates src="@raw/my_ca"/>
  </trust-anchors>
  </base-config> 
</network-security-config>

 C:  >objection patchapk -s test_app.apk
  No  architecture specified. Determining it using `adb`...
  Detected  target device architecture as: armeabi-v7a
  Github  FridaGadget is v10.6.28, local is v10.6.13. Updating...
  Downloading  armeabi-v7a library to  C:.objectionandroidarmeabi-v7alibfrida-gadget.so.xz...
  Unpacking  C:.objectionandroidarmeabi-v7alibfrida-gadget.so.xz...
  Cleaning up  downloaded archives...
  Using Gadget  version: 10.6.28
  Unpacking  test_app.apk
  App already  has android.permission.INTERNET
  Reading  smali from:  C:Temptmp8dxqks1u.apktempsmalicom/test/app/TestMainActivity.smali
  Injecting  loadLibrary call at line: 10
  Writing  patched smali back to: C:Temptmp8dxqks1u.apktempsmalicom/test/app/TestMainActivity.smali
  Creating  library path: C:Temptmp8dxqks1u.apktemplibarmeabi-v7a
  Copying  Frida gadget to libs path...
  Rebuilding  the APK with the frida-gadget loaded...
  Built new  APK with injected loadLibrary and frida-gadget
  Signing new  APK.
  jar signed.
  Signed the  new APK
  Performing  zipalign
  Zipaling  completed
  Copying  final apk from  C:UserscwassAppDataLocalTemptmp8dxqks1u.apktemp.aligned.objection.apk to  current directory...
Cleaning up  temp files...

Поиск trustmanager

Архитектура шифрования Java (JCA) – очень гибкая архитектура, и ее общая структура выглядит следующим образом:

Приложения Java получают доступ к службам шифрования через уровень интерфейса. В состав уровня интерфейса входят JAAS (Java Authentication Authorization Service, Java Authentication and Authorization API), JSSE (Java Secure Socket Extension, Java Secure Socket Extension)

JCA также определяет набор интерфейсов поставщика услуг шифрования, напримерjavax.net.ssl.SSLContextSpi с участием javax.net.ssl.TrustManagerFactorySpi Подождите. Разработчики служб шифрования реализуют эти интерфейсы и передаютjava.security.Security Предоставленный интерфейс зарегистрирован в структуре JCA.

Для системы AndroidTrustManagerFactory Регистрация службы шифрования находится наActivityThread изhandleBindApplication() Соответствующий код (находится вframeworks/base/core/java/android/app/ActivityThread.java)следующим образом:

        // Install the Network Security Config Provider. This must happen before the application
        // code is loaded to prevent issues with instances of TLS objects being created before
        // the provider is installed.
        Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "NetworkSecurityConfigProvider.install");
        NetworkSecurityConfigProvider.install(appContext);
        Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);

NetworkSecurityConfigProvider Определение класса (находится вframeworks/base/core/java/android/security/net/config/NetworkSecurityConfigProvider.java)следующим образом:

package android.security.net.config;

import android.content.Context;
import java.security.Security;
import java.security.Provider;

/** @hide */publicfinalclassNetworkSecurityConfigProviderextendsProvider {privatestaticfinal String PREFIX =
            NetworkSecurityConfigProvider.class.getPackage().getName()   ".";

    publicNetworkSecurityConfigProvider() {
        super("AndroidNSSP", 1.0, "Android Network Security Policy Provider");
        put("TrustManagerFactory.PKIX", PREFIX   "RootTrustManagerFactorySpi");
        put("Alg.Alias.TrustManagerFactory.X509", "PKIX");
    }

    publicstaticvoidinstall(Context context) {
        ApplicationConfig config = new ApplicationConfig(new ManifestConfigSource(context));
        ApplicationConfig.setDefaultInstance(config);
        int pos = Security.insertProviderAt(new NetworkSecurityConfigProvider(), 1);
        if (pos != 1) {
            thrownew RuntimeException("Failed to install provider as highest priority provider."
                      " Provider was installed at position "   pos);
        }
        libcore.net.NetworkSecurityPolicy.setInstance(new ConfigNetworkSecurityPolicy(config));
    }
}

ВNetworkSecurityConfigProvider.install() В методе передайтеSecurity.insertProviderAt() БудетNetworkSecurityConfigProvider Зарегистрирован в рамках JCA. Из NetworkSecurityConfigProvider Конструктор видит, что онandroid.security.net.config.RootTrustManagerFactorySpi Внесите в структуру JCA.

android.security.net.config.RootTrustManagerFactorySpi Определение (находится вframeworks/base/core/java/android/security/net/config/RootTrustManagerFactorySpi.java)следующим образом:

package android.security.net.config;

import android.util.Pair;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidParameterException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.Security;
import java.util.Set;
import javax.net.ssl.ManagerFactoryParameters;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.TrustManagerFactorySpi;

import com.android.internal.annotations.VisibleForTesting;

/** @hide */publicclassRootTrustManagerFactorySpiextendsTrustManagerFactorySpi {private ApplicationConfig mApplicationConfig;
    private NetworkSecurityConfig mConfig;

    @OverridepublicvoidengineInit(ManagerFactoryParameters spec)
            throws InvalidAlgorithmParameterException {
        if (!(spec instanceof ApplicationConfigParameters)) {
            thrownew InvalidAlgorithmParameterException("Unsupported spec: "    spec   ". Only "
                      ApplicationConfigParameters.class.getName()   " supported");

        }
        mApplicationConfig = ((ApplicationConfigParameters) spec).config;
    }

    @OverridepublicvoidengineInit(KeyStore ks) throws KeyStoreException {
        if (ks != null) {
            mApplicationConfig = new ApplicationConfig(new KeyStoreConfigSource(ks));
        } else {
            mApplicationConfig = ApplicationConfig.getDefaultInstance();
        }
    }

    @Overridepublic TrustManager[] engineGetTrustManagers() {
        if (mApplicationConfig == null) {
            thrownew IllegalStateException("TrustManagerFactory not initialized");
        }
        returnnew TrustManager[] { mApplicationConfig.getTrustManager() };
    }

    @VisibleForTestingpublicstaticfinalclassApplicationConfigParametersimplementsManagerFactoryParameters {publicfinal ApplicationConfig config;
        publicApplicationConfigParameters(ApplicationConfig config) {
            this.config = config;
        }
    }
}

RootTrustManagerFactorySpi изTrustManager Из ApplicationConfig，ApplicationConfig СреднийTrustManager Связанный код (находится вframeworks/base/core/java/android/security/net/config/ApplicationConfig.java)следующим образом:

publicfinalclassApplicationConfig {privatestatic ApplicationConfig sInstance;
    privatestatic Object sLock = new Object();

    private Set<Pair<Domain, NetworkSecurityConfig>> mConfigs;
    private NetworkSecurityConfig mDefaultConfig;
    private X509TrustManager mTrustManager;
. . . . . .
    /**
     * Returns the {@link X509TrustManager} that implements the checking of trust anchors and
     * certificate pinning based on this configuration.
     */public X509TrustManager getTrustManager() {
        ensureInitialized();
        return mTrustManager;
    }
. . . . . .
    privatevoidensureInitialized() {
        synchronized(mLock) {
            if (mInitialized) {
                return;
            }
            mConfigs = mConfigSource.getPerDomainConfigs();
            mDefaultConfig = mConfigSource.getDefaultConfig();
            mConfigSource = null;
            mTrustManager = new RootTrustManager(this);
            mInitialized = true;
        }
    }

ApplicationConfig изTrustManager Да RootTrustManager。

Давайте посмотрим на уровень интерфейса JCAjavax.net.ssl.TrustManagerFactory Определение:

Проверка легальности цепочки сертификатов

Каким образом корневое хранилище сертификатов используется для процесса проверки сертификата при подтверждении связи SSL / TLS с корневым хранилищем сертификатов?

Срок действия сертификата определяется стандартной библиотекой Java.javax.net.ssl.SSLSocket ВstartHandshake() Метод завершен. Для системы AndroidSSLSocket Эта реализация, основанная на реализации библиотеки OpenSSL, реализованаexternal/conscrypt Модуль предоставлен,SSLSocket Реализуется какOpenSSLSocketImpl Класс (находится вexternal/conscrypt/src/main/java/org/conscrypt/OpenSSLSocketImpl.java）。

OpenSSLSocketImpl.startHandshake() Подтверждение SSL / TLS – чрезвычайно деликатный процесс. Мы пропускаем подробный процесс установления связи и сосредотачиваемся на части проверки сертификата.

OpenSSLSocketImpl.startHandshake() ПроходятNativeCrypto Класс (находится вexternal/conscrypt/src/main/java/org/conscrypt/NativeCrypto.java) Статический метод локального слояSSL_do_handshake() Метод выполняет операцию рукопожатия:

/**
     * Returns the sslSessionNativePointer of the negotiated session. If this is
     * a server negotiation, supplying the {@code alpnProtocols} will enable
     * ALPN negotiation.
     */publicstaticnativelongSSL_do_handshake(long sslNativePointer,
                                               FileDescriptor fd,
                                               SSLHandshakeCallbacks shc,
                                               int timeoutMillis,
                                               boolean client_mode,
                                               byte[] npnProtocols,
                                               byte[] alpnProtocols)
        throws SSLException, SocketTimeoutException, CertificateException;

NativeCrypto Класс определяет набор обратных вызовов, которые будут вызываться кодом OpenSSL C / C , связанным с рукопожатием SSL на локальном уровне.SSLHandshakeCallbacks,над SSL_do_handshake() В методе этот набор обратных вызовов передается на локальный уровень в качестве параметров.

SSLHandshakeCallbacks Это определяется следующим образом:

/**
     * A collection of callbacks from the native OpenSSL code that are
     * related to the SSL handshake initiated by SSL_do_handshake.
     */publicinterfaceSSLHandshakeCallbacks {/**
         * Verify that we trust the certificate chain is trusted.
         *
         * @param sslSessionNativePtr pointer to a reference of the SSL_SESSION
         * @param certificateChainRefs chain of X.509 certificate references
         * @param authMethod auth algorithm name
         *
         * @throws CertificateException if the certificate is untrusted
         */publicvoidverifyCertificateChain(long sslSessionNativePtr, long[] certificateChainRefs,
                String authMethod) throws CertificateException;

        /**
         * Called on an SSL client when the server requests (or
         * requires a certificate). The client can respond by using
         * SSL_use_certificate and SSL_use_PrivateKey to set a
         * certificate if has an appropriate one available, similar to
         * how the server provides its certificate.
         *
         * @param keyTypes key types supported by the server,
         * convertible to strings with #keyType
         * @param asn1DerEncodedX500Principals CAs known to the server
         */publicvoidclientCertificateRequested(byte[] keyTypes,
                                               byte[][] asn1DerEncodedX500Principals)
            throws CertificateEncodingException, SSLException;

        /**
         * Gets the key to be used in client mode for this connection in Pre-Shared Key (PSK) key
         * exchange.
         *
         * @param identityHint PSK identity hint provided by the server or {@code null} if no hint
         *        provided.
         * @param identity buffer to be populated with PSK identity (NULL-terminated modified UTF-8)
         *        by this method. This identity will be provided to the server.
         * @param key buffer to be populated with key material by this method.
         *
         * @return number of bytes this method stored in the {@code key} buffer or {@code 0} if an
         *         error occurred in which case the handshake will be aborted.
         */publicintclientPSKKeyRequested(String identityHint, byte[] identity, byte[] key);

        /**
         * Gets the key to be used in server mode for this connection in Pre-Shared Key (PSK) key
         * exchange.
         *
         * @param identityHint PSK identity hint provided by this server to the client or
         *        {@code null} if no hint was provided.
         * @param identity PSK identity provided by the client.
         * @param key buffer to be populated with key material by this method.
         *
         * @return number of bytes this method stored in the {@code key} buffer or {@code 0} if an
         *         error occurred in which case the handshake will be aborted.
         */publicintserverPSKKeyRequested(String identityHint, String identity, byte[] key);

        /**
         * Called when SSL state changes. This could be handshake completion.
         */publicvoidonSSLStateChange(long sslSessionNativePtr, int type, int val);
    }

среди нихverifyCertificateChain()Обратный вызов используется для проверки сертификата сервера. Система Android использует этот обратный вызов для подключения модуля управления библиотекой корневых сертификатов с подтверждением связи SSL / TLS и проверкой подлинности базового OpenSSL.

SSLHandshakeCallbacks Обратный звонок отOpenSSLSocketImpl достичь,verifyCertificateChain() Реализация следующая:

@SuppressWarnings("unused") @OverridepublicvoidverifyCertificateChain(long sslSessionNativePtr, long[] certRefs, String authMethod)
            throws CertificateException {
        try {
            X509TrustManager x509tm = sslParameters.getX509TrustManager();
            if (x509tm == null) {
                thrownew CertificateException("No X.509 TrustManager");
            }
            if (certRefs == null || certRefs.length == 0) {
                thrownew SSLException("Peer sent no certificate");
            }
            OpenSSLX509Certificate[] peerCertChain = new OpenSSLX509Certificate[certRefs.length];
            for (int i = 0; i < certRefs.length; i  ) {
                peerCertChain[i] = new OpenSSLX509Certificate(certRefs[i]);
            }

            
            handshakeSession = new OpenSSLSessionImpl(sslSessionNativePtr, null, peerCertChain,
                    getHostnameOrIP(), getPort(), null);

            boolean client = sslParameters.getUseClientMode();
            if (client) {
                Platform.checkServerTrusted(x509tm, peerCertChain, authMethod, this);
                if (sslParameters.isCTVerificationEnabled(getHostname())) {
                    byte[] tlsData = NativeCrypto.SSL_get_signed_cert_timestamp_list(
                                        sslNativePointer);
                    byte[] ocspData = NativeCrypto.SSL_get_ocsp_response(sslNativePointer);

                    CTVerifier ctVerifier = sslParameters.getCTVerifier();
                    CTVerificationResult result =
                        ctVerifier.verifySignedCertificateTimestamps(peerCertChain, tlsData, ocspData);

                    if (result.getValidSCTs().size() == 0) {
                        thrownew CertificateException("No valid SCT found");
                    }
                }
            } else {
                String authType = peerCertChain[0].getPublicKey().getAlgorithm();
                Platform.checkClientTrusted(x509tm, peerCertChain, authType, this);
            }
        } catch (CertificateException e) {
            throw e;
        } catch (Exception e) {
            thrownew CertificateException(e);
        } finally {
            
            handshakeSession = null;
        }
    }

OpenSSLSocketImpl изverifyCertificateChain() Из sslParameters ПолучитьX509TrustManagerА потом вPlatform.checkServerTrusted() （com.android.org.conscrypt.Platform,роды external/conscrypt/src/compat/java/org/conscrypt/Platform.java) При выполнении проверки действительности сертификата на стороне сервера:

publicstaticvoidcheckServerTrusted(X509TrustManager tm, X509Certificate[] chain,
            String authType, OpenSSLSocketImpl socket) throws CertificateException {
        if (!checkTrusted("checkServerTrusted", tm, chain, authType, Socket.class, socket)
                && !checkTrusted("checkServerTrusted", tm, chain, authType, String.class,
                                 socket.getHandshakeSession().getPeerHost())) {
            tm.checkServerTrusted(chain, authType);
        }
    }

Platform.checkServerTrusted() ВыполняяX509TrustManager изcheckServerTrusted() Метод выполняет проверку действительности сертификата.

X509TrustManager Из OpenSSLSocketImpl изsslParameters, ЧтоsslParameters Откуда это?OpenSSLSocketImpl изsslParameters Передано создателем объекта:

publicclassOpenSSLSocketImplextendsjavax.net.ssl.SSLSocketimplementsNativeCrypto.SSLHandshakeCallbacks, SSLParametersImpl.AliasChooser,
        SSLParametersImpl.PSKCallbacks {
. . . . . .
    privatefinal SSLParametersImpl sslParameters;
. . . . . .
    protectedOpenSSLSocketImpl(SSLParametersImpl sslParameters) throws IOException {
        this.socket = this;
        this.peerHostname = null;
        this.peerPort = -1;
        this.autoClose = false;
        this.sslParameters = sslParameters;
    }

    protectedOpenSSLSocketImpl(String hostname, int port, SSLParametersImpl sslParameters)
            throws IOException {
        super(hostname, port);
        this.socket = this;
        this.peerHostname = hostname;
        this.peerPort = port;
        this.autoClose = false;
        this.sslParameters = sslParameters;
    }

    protectedOpenSSLSocketImpl(InetAddress address, int port, SSLParametersImpl sslParameters)
            throws IOException {
        super(address, port);
        this.socket = this;
        this.peerHostname = null;
        this.peerPort = -1;
        this.autoClose = false;
        this.sslParameters = sslParameters;
    }


    protectedOpenSSLSocketImpl(String hostname, int port,
                                InetAddress clientAddress, int clientPort,
                                SSLParametersImpl sslParameters) throws IOException {
        super(hostname, port, clientAddress, clientPort);
        this.socket = this;
        this.peerHostname = hostname;
        this.peerPort = port;
        this.autoClose = false;
        this.sslParameters = sslParameters;
    }

    protectedOpenSSLSocketImpl(InetAddress address, int port,
                                InetAddress clientAddress, int clientPort,
                                SSLParametersImpl sslParameters) throws IOException {
        super(address, port, clientAddress, clientPort);
        this.socket = this;
        this.peerHostname = null;
        this.peerPort = -1;
        this.autoClose = false;
        this.sslParameters = sslParameters;
    }

    /**
     * Create an SSL socket that wraps another socket. Invoked by
     * OpenSSLSocketImplWrapper constructor.
     */protectedOpenSSLSocketImpl(Socket socket, String hostname, int port,
            boolean autoClose, SSLParametersImpl sslParameters) throws IOException {
        this.socket = socket;
        this.peerHostname = hostname;
        this.peerPort = port;
        this.autoClose = autoClose;
        this.sslParameters = sslParameters;

        
    }

Другими словами,OpenSSLSocketImpl изsslParameters Из javax.net.ssl.SSLSocketFactory,который OpenSSLSocketFactoryImpl。OpenSSLSocketFactoryImpl Определение (находится вexternal/conscrypt/src/main/java/org/conscrypt/OpenSSLSocketFactoryImpl.java)следующим образом:

package org.conscrypt;

import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.security.KeyManagementException;

publicclassOpenSSLSocketFactoryImplextendsjavax.net.ssl.SSLSocketFactory {privatefinal SSLParametersImpl sslParameters;
    privatefinal IOException instantiationException;

    publicOpenSSLSocketFactoryImpl() {
        SSLParametersImpl sslParametersLocal = null;
        IOException instantiationExceptionLocal = null;
        try {
            sslParametersLocal = SSLParametersImpl.getDefault();
        } catch (KeyManagementException e) {
            instantiationExceptionLocal = new IOException("Delayed instantiation exception:");
            instantiationExceptionLocal.initCause(e);
        }
        this.sslParameters = sslParametersLocal;
        this.instantiationException = instantiationExceptionLocal;
    }

    publicOpenSSLSocketFactoryImpl(SSLParametersImpl sslParameters) {
        this.sslParameters = sslParameters;
        this.instantiationException = null;
    }

    @Overridepublic String[] getDefaultCipherSuites() {
        return sslParameters.getEnabledCipherSuites();
    }

    @Overridepublic String[] getSupportedCipherSuites() {
        return NativeCrypto.getSupportedCipherSuites();
    }

    @Overridepublic Socket createSocket() throws IOException {
        if (instantiationException != null) {
            throw instantiationException;
        }
        returnnew OpenSSLSocketImpl((SSLParametersImpl) sslParameters.clone());
    }

    @Overridepublic Socket createSocket(String hostname, int port) throws IOException, UnknownHostException {
        returnnew OpenSSLSocketImpl(hostname, port, (SSLParametersImpl) sslParameters.clone());
    }

    @Overridepublic Socket createSocket(String hostname, int port, InetAddress localHost, int localPort)
            throws IOException, UnknownHostException {
        returnnew OpenSSLSocketImpl(hostname,
                                     port,
                                     localHost,
                                     localPort,
                                     (SSLParametersImpl) sslParameters.clone());
    }

    @Overridepublic Socket createSocket(InetAddress address, int port) throws IOException {
        returnnew OpenSSLSocketImpl(address, port, (SSLParametersImpl) sslParameters.clone());
    }

    @Overridepublic Socket createSocket(InetAddress address,
                               int port,
                               InetAddress localAddress,
                               int localPort)
            throws IOException {
        returnnew OpenSSLSocketImpl(address,
                                     port,
                                     localAddress,
                                     localPort,
                                     (SSLParametersImpl) sslParameters.clone());
    }

    @Overridepublic Socket createSocket(Socket s, String hostname, int port, boolean autoClose)
            throws IOException {
        returnnew OpenSSLSocketImplWrapper(s,
                                            hostname,
                                            port,
                                            autoClose,
                                            (SSLParametersImpl) sslParameters.clone());
    }
}

OpenSSLSocketImpl Основная ответственность – установить параметры SSL / TLS.SSLParametersImpl Придерживайтесь SSLSocket. В основном смотрите по умолчаниюSSLParametersImpl изX509TrustManager Что находится (находится вexternal/conscrypt/src/main/java/org/conscrypt/SSLParametersImpl.java ）：

/**
     * Initializes the parameters. Naturally this constructor is used
     * in SSLContextImpl.engineInit method which directly passes its
     * parameters. In other words this constructor holds all
     * the functionality provided by SSLContext.init method.
     * See {@link javax.net.ssl.SSLContext#init(KeyManager[],TrustManager[],
     * SecureRandom)} for more information
     */protectedSSLParametersImpl(KeyManager[] kms, TrustManager[] tms,
            SecureRandom sr, ClientSessionContext clientSessionContext,
            ServerSessionContext serverSessionContext, String[] protocols)
            throws KeyManagementException {
        this.serverSessionContext = serverSessionContext;
        this.clientSessionContext = clientSessionContext;

        if (kms == null) {
            x509KeyManager = getDefaultX509KeyManager();
            
            pskKeyManager = null;
        } else {
            x509KeyManager = findFirstX509KeyManager(kms);
            pskKeyManager = findFirstPSKKeyManager(kms);
        }

        if (tms == null) {
            x509TrustManager = getDefaultX509TrustManager();
        } else {
            x509TrustManager = findFirstX509TrustManager(tms);
        }

        
        secureRandom = sr;

        
        enabledProtocols = NativeCrypto.checkEnabledProtocols(
                protocols == null ? NativeCrypto.DEFAULT_PROTOCOLS : protocols).clone();
        boolean x509CipherSuitesNeeded = (x509KeyManager != null) || (x509TrustManager != null);
        boolean pskCipherSuitesNeeded = pskKeyManager != null;
        enabledCipherSuites = getDefaultCipherSuites(
                x509CipherSuitesNeeded, pskCipherSuitesNeeded);
    }

    protectedstatic SSLParametersImpl getDefault() throws KeyManagementException {
        SSLParametersImpl result = defaultParameters;
        if (result == null) {
            
            defaultParameters = result = new SSLParametersImpl(null,
                                                               null,
                                                               null,
                                                               new ClientSessionContext(),
                                                               new ServerSessionContext(),
                                                               null);
        }
        return (SSLParametersImpl) result.clone();
    }
 . . . . . . 
    /**
     * @return X.509 trust manager or {@code null} for none.
     */protected X509TrustManager getX509TrustManager() {
        return x509TrustManager;
    }
 . . . . . . 
    /**
     * Gets the default X.509 trust manager.
     * <p>
     * TODO: Move this to a published API under dalvik.system.
     */publicstatic X509TrustManager getDefaultX509TrustManager()
            throws KeyManagementException {
        X509TrustManager result = defaultX509TrustManager;
        if (result == null) {
            
            defaultX509TrustManager = result = createDefaultX509TrustManager();
        }
        return result;
    }

    privatestatic X509TrustManager createDefaultX509TrustManager()
            throws KeyManagementException {
        try {
            String algorithm = TrustManagerFactory.getDefaultAlgorithm();
            TrustManagerFactory tmf = TrustManagerFactory.getInstance(algorithm);
            tmf.init((KeyStore) null);
            TrustManager[] tms = tmf.getTrustManagers();
            X509TrustManager trustManager = findFirstX509TrustManager(tms);
            if (trustManager == null) {
                thrownew KeyManagementException(
                        "No X509TrustManager in among default TrustManagers: "
                                  Arrays.toString(tms));
            }
            return trustManager;
        } catch (NoSuchAlgorithmException e) {
            thrownew KeyManagementException(e);
        } catch (KeyStoreException e) {
            thrownew KeyManagementException(e);
        }
    }

БудетcreateDefaultX509TrustManager() Скопируйте код в наше приложение, как показано ниже:

private X509TrustManager systemDefaultTrustManager() {
            try {
                TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(
                        TrustManagerFactory.getDefaultAlgorithm());
                trustManagerFactory.init((KeyStore) null);
                TrustManager[] trustManagers = trustManagerFactory.getTrustManagers();
                if (trustManagers.length != 1 || !(trustManagers[0] instanceof X509TrustManager)) {
                    thrownew IllegalStateException("Unexpected default trust managers:"
                              Arrays.toString(trustManagers));
                }
                return (X509TrustManager) trustManagers[0];
            } catch (GeneralSecurityException e) {
                thrownew AssertionError(); 
            }
        }

Прервите точку во время выполнения приложения и подтвердите системное значение по умолчанию с помощью Android StudioX509TrustManager Что это такое, подтвердить несложно, этоandroid.security.net.config.RootTrustManager。android.security.net.config.