Securing Elmah in ASP.NET website

Solution 1:

I played around with the web.config and got the following to work. Basically instead of putting the elmah.axd HttpHandler in the general system.web, add it specifically in the system.web of your "admin" path location.

<location path="admin">
    <system.web>
        <httpHandlers>
            <add verb="POST,GET,HEAD" path="elmah.axd"
                 type="Elmah.ErrorLogPageFactory, Elmah" />
        </httpHandlers>
        <authorization>
            <deny users="?"/>
        </authorization>
    </system.web>
</location>

Solution 2:

If you are using ASP.NET MVC, you're going to need to have the routing engine ignore that path. If you want to move elmah to /admin/elmah.axd for instance you should add the following to Global.asax.cs:

routes.IgnoreRoute("admin/elmah.axd/{*pathInfo}");

Solution 3:

Having spent a while trying to get this to work by patching together the various bits of advice from each of the answers, I've put together a complete solution that should work for all flavours of IIS.

Here's what needs to be in each of your web.config sections:

<configuration>
  <configSections>
    <sectionGroup name="elmah">
      <section name="security" requirePermission="false" type="Elmah.SecuritySectionHandler, Elmah" />
      <section name="errorLog" requirePermission="false" type="Elmah.ErrorLogSectionHandler, Elmah" />
      <section name="errorMail" requirePermission="false" type="Elmah.ErrorMailSectionHandler, Elmah" />
      <section name="errorFilter" requirePermission="false" type="Elmah.ErrorFilterSectionHandler, Elmah" />
    </sectionGroup>
  </configSections>

  <elmah>
    <!-- set allowRemoteAccess="0" for extra security -->
    <security allowRemoteAccess="1"/>
  </elmah>

  <system.web>
    <httpModules>
      <add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah" />
      <add name="ErrorMail" type="Elmah.ErrorMailModule, Elmah" />
      <add name="ErrorFilter" type="Elmah.ErrorFilterModule, Elmah" />
    </httpModules>
  </system.web>

  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true">
      <add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah" preCondition="managedHandler" />
      <add name="ErrorMail" type="Elmah.ErrorMailModule, Elmah" preCondition="managedHandler" />
      <add name="ErrorFilter" type="Elmah.ErrorFilterModule, Elmah" preCondition="managedHandler" />
    </modules>
  </system.webServer>

  <location path="admin">
    <system.web>
      <authorization>
        <!--<allow users="Admin" /> -->
        <deny users="?" />
      </authorization>
      <httpHandlers>
        <add verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah" />
      </httpHandlers>
    </system.web>
    <system.webServer>
      <handlers>
        <add name="Elmah" path="elmah.axd" verb="POST,GET,HEAD" type="Elmah.ErrorLogPageFactory, Elmah" preCondition="integratedMode" />
      </handlers>
    </system.webServer>
  </location>

</configuration>

And if you're using Asp.Net MVC, add

routes.IgnoreRoute("admin/elmah.axd/{*pathInfo}");

in your RegisterRoutes method.