在ExecuteURL中使用web.config作为404处理程序将绕过URL重写。( outboundRules)在使用其他responseModes时不会

Question

web.config中有以下规则，用于识别和重写具有安全标志和httpOnly标志的出站会话cookie：

<rewrite>
    <outboundRules>
        <preConditions>
            <preCondition name="MatchSessionCookies">
                <add input="{RESPONSE_SET_COOKIE}" pattern="." />
            </preCondition>
        </preConditions>

        <rule preCondition="MatchSessionCookies" name="SecureSessionCookies" enabled="true">
            <match serverVariable="RESPONSE_SET_COOKIE" pattern="^(.*sess.*)=(.+)$" />
            <action type="Rewrite" value="{R:1}={R:2}; httpOnly; secure" />
        </rule>
    </outboundRules>
</rewrite>

这按照预期工作，直到httpErrors发挥作用为止：

<httpErrors>
    <remove statusCode="404" subStatusCode="-1" />
    <error statusCode="404" prefixLanguageFilePath="" path="/path/to/404.aspx" responseMode="ExecuteURL" />
</httpErrors>

因此，在访问/a-page-that-exists.aspx时，被写入的出站ASPSESSIONID cookie将被成功地用安全标志和httpOnly标志重写。

Request URL: /a-page-that-exists.aspx
Status Code: 200 OK

Set-Cookie: ASPSESSIONIDABCDEFG=...; path=/; httpOnly; secure

问题是访问/a-page-that-does-NOT-exist.aspx。看来404请求在内部被“路由”到ExecuteURL路径，并且我的URL重写规则被完全绕过。

Request URL: /a-page-that-does-NOT-exist.aspx
Status Code: 200 OK

Set-Cookie: ASPSESSIONIDABCDEFG=...; path=/

对于如何修改我的出站重写规则，以便在提交给我的404处理程序之前，它们可以应用于404请求，有什么想法吗？

Answer 1

看来，我们必须使用IIS重写版本的IIS <httpErrors />处理程序，但它有效：

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <!-- Remove existing 404 handler -->
        <httpErrors>
            <remove statusCode="404" subStatusCode="-1" />
        </httpErrors>

        <rewrite>
            <outboundRules>
                <preConditions>
                    <preCondition name="MatchSessionCookies">
                        <add input="{RESPONSE_SET_COOKIE}" pattern="." />
                    </preCondition>
                </preConditions>

                <!-- Does NOT work with ExecuteURL 404 handler -->
                <rule preCondition="MatchSessionCookies" name="SecureSessionCookies" enabled="true">
                    <match serverVariable="RESPONSE_SET_COOKIE" pattern="^(gsm|.*sess.*)=(.+)$" />
                    <action type="Rewrite" value="{R:1}={R:2}; httpOnly; secure" />
                </rule>
            </outboundRules>
            <rules>
                <!-- Re-implement ExecuteURL 404 handler as URL Rewrite -->
                <rule name="Handle404" stopProcessing="true">
                    <match url=".*" />
                    <conditions logicalGrouping="MatchAny">
                        <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
                    </conditions>
                    <action type="Rewrite" url="/path/to/404.aspx?404;{PreserveSchema:{HTTPS}}{HTTP_HOST}{UNENCODED_URL}" />
                </rule>
            </rules>
            <rewriteMaps>
                <!-- http://stackoverflow.com/a/10227936/901156 -->
                <rewriteMap name="PreserveSchema" defaultValue="OFF">
                    <add key="ON" value="https://" />
                    <add key="OFF" value="http://" />
                </rewriteMap>
            </rewriteMaps>
        </rewrite>
    </system.webServer>
</configuration>

以及答复：

Request URL: /a-page-that-does-NOT-exist.aspx
Status Code: 200 OK

Set-Cookie: ASPSESSIONIDABCDEFG=...; path=/; httpOnly; secure