Android证书安装过程介绍

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/class="lazy" data-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/class="lazy" data-src/com/android/settings/CredentialStorage.java    installIfAvailable

添加证书：Settings/class="lazy" data-src/com/android/settings/CredentialStorage.java    installIfAvailable()

删除证书：Settings/class="lazy" data-src/com/android/settings/TrustedCredentialsSettings.java   AliasOperation#doInBackground

显示证书：Settings/class="lazy" data-src/com/android/settings/TrustedCredentialsSettings.java   AdapterData#AliasLoader#doInBackground   

证书内容：Settings/class="lazy" data-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)

CertInstaller\class="lazy" data-src\com\android\certinstaller\CredentialHelper.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/class="lazy" data-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/class="lazy" data-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        

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