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14.2 对Framework中安全性的支持
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14.2 对Framework中安全性的支持
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165420.htm'>14.1.1 代码组</a></div><div style='float:right;width:49%'>·<a href='100165421.htm'>14.1.2 代码访问权限和权限集</a></div><div style='float:left;width:49%'>·<a href='100165422.htm'>14.1.3 策略的级别：Machine、User和Enterprise</a></div><div style='float:right;width:49%'>·<a href='100165424.htm'>14.2.1 要求权限</a></div><div style='float:left;width:49%'>·<a href='100165425.htm'>14.2.2 请求权限</a></div><div style='float:right;width:49%'>·<a href='100165426.htm'>14.2.3 隐式的权限</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style="MARGIN-TOP: 11.4pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 11.4pt"><a ftel="_Toc507815603"><span lang="EN-US">14.2 </span></a><span style="FONT-FAMILY: 楷体_GB2312">对</span><span lang="EN-US">Framework</span><span style="FONT-FAMILY: 楷体_GB2312">中安全性的支持</span></h3>
<p class="MsoNormal"><span style="COLOR: black; FONT-FAMILY: 宋体">程序员在使用</span><span lang="EN-US" style="COLOR: black">.NET</span><span style="COLOR: black; FONT-FAMILY: 宋体">的安全性时，必须信任</span><span lang="EN-US" style="COLOR: black">CLR</span><span style="COLOR: black; FONT-FAMILY: 宋体">能够很好地执行安全性策略。当调用的方法需要特定的权限</span><span lang="EN-US" style="COLOR: black">(</span><span style="COLOR: black; FONT-FAMILY: 宋体">例如访问本地磁盘上文件的权限</span><span lang="EN-US" style="COLOR: black">)</span><span style="COLOR: black; FONT-FAMILY: 宋体">时，</span><span lang="EN-US" style="COLOR: black">CLR</span><span style="COLOR: black; FONT-FAMILY: 宋体">将把调用放入堆栈中，以确保调用链上的每一个调用者都能得到它们请求的权限。</span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-FAMILY: 宋体">此时就要考虑性能了，但为了充分发挥托管环境</span><span lang="EN-US" style="COLOR: black">(</span><span style="COLOR: black; FONT-FAMILY: 宋体">如</span><span lang="EN-US" style="COLOR: black">.NET)</span><span style="COLOR: black; FONT-FAMILY: 宋体">的优点，就必须牺牲一部分性能。另一种方式是不完全可信的程序集可以调用完全可信的程序集，这样，系统将很容易遭到攻击。</span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-FAMILY: 宋体">为了引用</span><span lang="EN-US" style="COLOR: black">.NET</span><span style="COLOR: black; FONT-FAMILY: 宋体">的安全特性，本章中大多数应用程序要使用</span><span lang="EN-US" style="COLOR: black">.NET Framework</span><span style="COLOR: black; FONT-FAMILY: 宋体">库中的命名</span><span lang="EN-US" style="COLOR: black"> </span><span style="COLOR: black; FONT-FAMILY: 宋体">空间：</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-US">●<span style="FONT: 7pt "Times New Roman""> </span></span><span lang="EN-US">System.Security.Permissions</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-US">●<span style="FONT: 7pt "Times New Roman""> </span></span><span lang="EN-US">System.Security.Policy</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-US">●<span style="FONT: 7pt "Times New Roman""> </span></span><span lang="EN-US">System.Security.Principal</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">注意，基于证据的代码访问安全性是在</span><span lang="EN-US">Windows</span><span style="FONT-FAMILY: 宋体">登录安全性之后进行工作的。如果要运行</span><span lang="EN-US">.NET</span><span style="FONT-FAMILY: 宋体">桌面应用程序，则必须赋予它相关的</span><span lang="EN-US">.NET</span><span style="FONT-FAMILY: 宋体">代码访问安全性权限。但是，已登录的用户也必须是</span><span lang="EN-US">Windows </span><span style="FONT-FAMILY: 宋体">账户的用户，才有执行代码的权限。对于桌面应用程序而言，这意味着当前的用户必须被赋予相关的权限，才能访问磁盘上相关的程序集文件。对于</span><span lang="EN-US">Internet</span><span style="FONT-FAMILY: 宋体">应用程序而言，运行</span><span lang="EN-US">Internet Information Server</span><span style="FONT-FAMILY: 宋体">的账户必须能够访问程序集文件。</span></p></div>
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<h1 id="divCurrentNode2" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165423.htm'><font color='red'>14.2 对Framework中安全性的支持</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165420.htm'>14.1.1 代码组</a></div><div style='float:right;width:49%'>·<a href='100165421.htm'>14.1.2 代码访问权限和权限集</a></div><div style='float:left;width:49%'>·<a href='100165422.htm'>14.1.3 策略的级别：Machine、User和Enterprise</a></div><div style='float:right;width:49%'>·<a href='100165424.htm'>14.2.1 要求权限</a></div><div style='float:left;width:49%'>·<a href='100165425.htm'>14.2.2 请求权限</a></div><div style='float:right;width:49%'>·<a href='100165426.htm'>14.2.3 隐式的权限</a></div></div>
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