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/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)

certinstaller\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/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        

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