Android证书安装过程介绍

287 阅读 0 评论 190 点赞

我是靠谱客的博主细腻毛豆，最近开发中收集的这篇文章主要介绍Android证书安装过程介绍，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

一.证书在源码中的路径

5.1系统证书(命名是 openssl x509 -subject_hash_old -in filename)

libcore/luni/src/main/files/cacerts

7.1及以后系统证书

/system/ca-certificates/files

二.证书在固件中的路径

/system/etc/security/cacerts

三.手动安装流程

设置-->安全-->从SD卡安装证书：

在AndroidManif.xml里

<Preference android:key="credentials_install"
        android:title="@string/credentials_install"
        android:summary="@string/credentials_install_summary"
        android:persistent="false">
    <intent android:action="android.credentials.INSTALL"
            android:targetPackage="com.android.certinstaller"
            android:targetClass="com.android.certinstaller.CertInstallerMain"/>
</Preference>

packages/apps/CertInstaller

CertInstallerMain打开Document，选择证书文件，选择好后。启动CerInstaller

然后根据证书类型区分createPkcs12PasswordDialog和createNameCredentialDialog，看个简单的createNameCredentialDialog

try {
    startActivityForResult(
            mCredentials.createSystemInstallIntent(),   //Intent intent = new Intent("com.android.credentials.INSTALL");
            REQUEST_SYSTEM_INSTALL_CODE);
} catch (ActivityNotFoundException e) {
    Log.w(TAG, "systemInstall(): " + e);
    toastErrorAndFinish(R.string.cert_not_saved);
}

看intent，又到了Settings的CredentialStorage

Settings/src/com/android/settings/CredentialStorage.java installIfAvailable

添加证书：Settings/src/com/android/settings/CredentialStorage.java installIfAvailable()

删除证书：Settings/src/com/android/settings/TrustedCredentialsSettings.java AliasOperation#doInBackground

显示证书：Settings/src/com/android/settings/TrustedCredentialsSettings.java AdapterData#AliasLoader#doInBackground

证书内容：Settings/src/com/android/settings/TrustedCredentialsSettings.java CertHolder SslCertificate

安装类型两种： userKey和Ca证书(pk12要处理密码)

CertInstallersrccomandroidcertinstallerCredentialHelper.java

异常码：

机器未设置密码锁

机器未解锁

锁屏方式不符合要求还是packages/apps/CertInstaller/CertInstallerMain，startActivityForResult结果回调

if (requestCode == REQUEST_SYSTEM_INSTALL_CODE) {
    if (resultCode == RESULT_OK) {
        Log.d(TAG, "credential is added: " + mCredentials.getName());
        Toast.makeText(this, getString(R.string.cert_is_added,
                mCredentials.getName()), Toast.LENGTH_LONG).show();
 
        if (mCredentials.hasCaCerts()) {
            // more work to do, don't finish just yet
            new InstallCaCertsToKeyChainTask().execute();
            return;
        }
        setResult(RESULT_OK);
    } else {
        Log.d(TAG, "credential not saved, err: " + resultCode);
        toastErrorAndFinish(R.string.cert_not_saved);
    }
}

如果是CaCerts，还要进行 new InstallCaCertsToKeyChainTask().execute() --> mCredentials.installCaCertsToKeyChain --> keyChainService.installCaCertificate

keyChainService实现在packages/apps/KeyChain mTrustedCertificateStore.installCertificate

external/conscrypt/src/platform/java/org/conscrypt/TrustedCertificateStore installCertificate --> writeCertificate

四.c层

system/security/keystore/keystore.cpp

添加证书 installIfAvailable -> mKeyStore.put -> mBinder.insert （这里还是java层）
-> KeyStoreProxy::insert -> KeyStore::put (这里getEncryptionKey用到一个AESkey，哪里来的？)

五.为什么要锁屏密码

以设置密码为例
Settings/src/com/android/settings/ChooseLockPassword.java mLockPatternUtils.saveLockPassword
frameworks/base/core/java/com/android/internal/widget/LockPatternUtils.java getLockSettings().setLockPassword
frameworks/base/services/core/java/com/android/server/LockSettingsService.java setLockPassword -> maybeUpdateKeystore -> ks.passwordUid
-> 到keystore.cpp的password_uid

password_uid 有三种状态，其中STATE_UNINITIALIZED和STATE_LOCKED都会调用setupMasterKeys，经锁屏密码设置AESkey
这里就解答了添加证书时的AESKey是哪来的

这个是基于Android5.1分析的，高版本可能文件名不同，但是知道大概位置，搜索下，应该没什么难度

到此这篇关于Android证书安装过程介绍的文章就介绍到这了,更多相关Android证书安装内容请搜索靠谱客以前的文章或继续浏览下面的相关文章希望大家以后多多支持靠谱客！