Android Fingerprint -- Enroll流程

其他 2018-10-22 15:51:39 阅读次数: 0 
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        Android Fingerprint -- Enroll流程        
           
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<div style="clear:both"></div><div style="border:solid 1px #ccc; background:#eee; float:left; min-width:200px;padding:4px 10px;"><p style="text-align:right;margin:0;"><span style="float:left;">目录<a href="#" title="系统根据文章中H1到H6标签自动生成文章目录">(?)</a></span><a href="#" onclick="javascript:return openct(this);" title="展开">[+]</a></p><ol style="display:none;margin-left:14px;padding-left:14px;line-height:160%;"><li><a href="#t0">
一preEnroll</a></li><li><a href="#t1">
二enroll</a></li><li><a href="#t2">
三postEnroll</a></li></ol></div><div style="clear:both"></div><div id="article_content" class="article_content tracking-ad" data-mod="popu_307" data-dsm="post">

<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
Enroll流程主要的工作是在hal层以下完成的。对于应用层和framwork层的流程就不做详细分析了。</p>
<h3 id="一preenroll" style="margin:0px; padding:0px; font-size:16px; line-height:1.5; font-family:Verdana,Arial,Helvetica,sans-serif"><a name="t0" target="_blank"></a>
一、preEnroll</h3>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
点击设置中的添加指纹，setting就会调到fingerprintd的preEnroll接口。preEnroll会在指纹TA中生成并保存一个64位的随机数。这个随机数有两个用途：</p>
<ul style="margin:0px 0px 0px 30px; padding:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
<li style="margin:0px; padding:0px; list-style:disc">
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px">返回给上层，用于填充enroll中的authenticated token challenge。</p>
</li><li style="margin:0px; padding:0px; list-style:disc">
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px">TA会用它对下次enroll做初步校验，保证enroll没有被第三方篡改。</p>
</li></ul>
<h3 id="二enroll" style="margin:0px; padding:0px; font-size:16px; line-height:1.5; font-family:Verdana,Arial,Helvetica,sans-serif"><a name="t1" target="_blank"></a>
二、enroll</h3>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
1 、我们先看一下 fingerprint.h对enroll接口的定义：</p>
<pre style="margin-top:10px; margin-bottom:10px; padding:0px; white-space:pre-wrap; word-wrap:break-word; color:rgb(51,51,51); font-size:13.3333px; background-color:rgb(255,255,255)"><code class="hljs cpp" style="margin:auto; vertical-align:middle; display:block; height:auto; overflow-x:auto; color:rgb(0,0,0); padding:5px!important; line-height:1.5!important; font-family:"Courier New",sans-serif!important; font-size:12px!important; border:1px solid rgb(204,204,204)!important"><span class="hljs-keyword" style="margin:0px; padding:0px; color:rgb(0,0,255)">int</span> (*enroll)(<span class="hljs-keyword" style="margin:0px; padding:0px; color:rgb(0,0,255)">struct</span> fingerprint_device *dev, <span class="hljs-keyword" style="margin:0px; padding:0px; color:rgb(0,0,255)">const</span> <span class="hljs-keyword" style="margin:0px; padding:0px; color:rgb(0,0,255)">hw_auth_token_t</span> *hat,
                <span class="hljs-keyword" style="margin:0px; padding:0px; color:rgb(0,0,255)">uint32_t</span> gid, <span class="hljs-keyword" style="margin:0px; padding:0px; color:rgb(0,0,255)">uint32_t</span> timeout_sec);</code></pre>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
1.1 、hw_auth_token_t：保证此次enroll的合法性，我们具体看一下<a href="http://lib.csdn.net/base/android" class="replace_word" title="Android知识库" target="_blank" style="color:#df3434; font-weight:bold;">Android</a>怎么定义此结构体的。<br style="margin:0px; padding:0px">
<img src="http://images2015.cnblogs.com/blog/984967/201609/984967-20160914142057617-98939389.jpg" alt="" style="margin:0px; padding:0px; border:0px; max-width:900px"></p>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
AuthToken version ：此token的版本号</p>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
Challenge：就是前面调用preEnroll的到的64位随机数，防止此次enroll被第三方假冒</p>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
User SID ： 安全性id，不是<a href="http://lib.csdn.net/base/android" class="replace_word" title="Android知识库" target="_blank" style="color:#df3434; font-weight:bold;">android</a> user id</p>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
Athenticator ID： 用于标明不同的认证权限</p>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
Authenticator Type：0x00表示Gatekeeper，0x01表示Fingerprint</p>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
Timestamp：最近一次开机时间戳</p>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
AuthToken HMAC key： 用一个特殊的key和SHA-256<a href="http://lib.csdn.net/base/datastructure" class="replace_word" title="算法与数据结构知识库" target="_blank" style="color:#df3434; font-weight:bold;">算法</a>去计算前面一堆参数后，得到的一个 hmac值，保证前面参数的合法性和安全性。</p>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
1.2. gid：说明是哪个用户注册指纹（anroid支持多用户）。</p>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
1.3. timeout_sec：超时设置。</p>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
2、上层调用enroll接口，一直将上述参数传递到指纹TA中。TA拿到参数之后会先检查参数是否合法。我们看看TA是怎样检查的：</p>
<pre style="margin-top:10px; margin-bottom:10px; padding:0px; white-space:pre-wrap; word-wrap:break-word; color:rgb(51,51,51); font-size:13.3333px; background-color:rgb(255,255,255)"><code class="hljs php" style="margin:auto; vertical-align:middle; display:block; height:auto; overflow-x:auto; color:rgb(0,0,0); padding:5px!important; line-height:1.5!important; font-family:"Courier New",sans-serif!important; font-size:12px!important; border:1px solid rgb(204,204,204)!important"><span class="hljs-comment" style="margin:0px; padding:0px; color:green">//核对传递下来的token->challenge与之前preEnroll阶段保存的g_challenge是否相同</span>
<span class="hljs-keyword" style="margin:0px; padding:0px; color:rgb(0,0,255)">if</span> (token && token->challenge == g_challenge) {
    g_user_id = token->user_id;
} <span class="hljs-keyword" style="margin:0px; padding:0px; color:rgb(0,0,255)">else</span> {
    LOGE(LOG_TAG <span class="hljs-string" style="margin:0px; padding:0px; color:rgb(163,21,21)">"[%s] invalid or null auth token"</span>, __func__);
}

<span class="hljs-comment" style="margin:0px; padding:0px; color:green">//检测token版本是否相同</span>
<span class="hljs-keyword" style="margin:0px; padding:0px; color:rgb(0,0,255)">if</span> (token && token->version != cmd->data.enroll.system_auth_token_version) {
    LOGE(LOG_TAG <span class="hljs-string" style="margin:0px; padding:0px; color:rgb(163,21,21)">"[%s] invalid hat version code detected"</span>, __func__);
    err = ERROR_INVALID_HAT_VERSION;
    <span class="hljs-keyword" style="margin:0px; padding:0px; color:rgb(0,0,255)">break</span>;
}
<span class="hljs-comment" style="margin:0px; padding:0px; color:green">//检测authenticator_type版本是否相同</span>
<span class="hljs-keyword" style="margin:0px; padding:0px; color:rgb(0,0,255)">if</span> (token && (token->authenticator_type & GF_HW_AUTH_FINGERPRINT)) {
    LOGE(LOG_TAG <span class="hljs-string" style="margin:0px; padding:0px; color:rgb(163,21,21)">"[%s] invalid challenge detected"</span>, __func__);
    err = ERROR_INVALID_CHALLENGE;
    <span class="hljs-keyword" style="margin:0px; padding:0px; color:rgb(0,0,255)">break</span>;
}
<span class="hljs-comment" style="margin:0px; padding:0px; color:green">/*token中，除了hmac之外的数据取出来，然后拿这部分数据用key和相应加密算法生成hmac*/</span>
cpl_memcpy(&hat, token, sizeof(gf_hw_auth_token_t));
cpl_memset(&(hat.hmac), <span class="hljs-number" style="margin:0px; padding:0px">0</span>, hmac_len);
generate_hmac(&hat);
<span class="hljs-comment" style="margin:0px; padding:0px; color:green">/*比对新生成的hmac和之前上层传递下来token中自带的hmac是否相同，如果相同则认为没本次enroll合法，接下来IC就会切换到一种采图的工作模式*/</span>
<span class="hljs-keyword" style="margin:0px; padding:0px; color:rgb(0,0,255)">if</span> (<span class="hljs-number" style="margin:0px; padding:0px">0</span> != cpl_memcmp(hat.hmac, token->hmac, hmac_len)) {
    LOGE(LOG_TAG <span class="hljs-string" style="margin:0px; padding:0px; color:rgb(163,21,21)">"[%s] token authenticate failed"</span>, __func__);
    err = ERROR_UNTRUSTED_ENROLL;
    <span class="hljs-keyword" style="margin:0px; padding:0px; color:rgb(0,0,255)">break</span>;
}</code></pre>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
3、验证完参数合法之后，TA会将指纹IC切换到一种等待手指按下采图的工作模式。此时一旦手指按下，会进入中断处理函数，该函数主要的工作流程如下图：<br style="margin:0px; padding:0px">
<img src="http://images2015.cnblogs.com/blog/984967/201609/984967-20160914142116945-2056315233.jpg" alt="" style="margin:0px; padding:0px; border:0px; max-width:900px"></p>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
从等待手指按下开始，到收到中断读取数据，送算法处理，然后保存图像数据为模板，上报注册进度等消息给上层，最后等待手指抬起。这个过程会一直循环，直到模板建立完成后上报注册完成消息给上层，enroll才算结束了。</p>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
4、因为读取数据，算法分析等过程都涉及IC厂商的商业机密，所以不能在此分享。</p>
<h3 id="三postenroll" style="margin:0px; padding:0px; font-size:16px; line-height:1.5; font-family:Verdana,Arial,Helvetica,sans-serif"><a name="t2" target="_blank"></a>
三、postEnroll</h3>
<p style="margin:10px auto; padding-top:0px; padding-bottom:0px; color:rgb(51,51,51); font-family:Verdana,Arial,Helvetica,sans-serif; font-size:13.3333px">
postEnroll主要工作是更新一下TA中保存的Challenge。</p>
   
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