public void TestGetDigest()
{
Request request = new Request();
List<CustomProperty> props = new List<CustomProperty>();
props.Add(new CustomProperty("Subject", "This is a subject"));
RoutingEntity sourceRouting = new RoutingEntity();
RoutingItem item = new RoutingItem();
item.Content = "*****@*****.**";
sourceRouting.Items = new RoutingItem[] {item};
request.Source = sourceRouting;
request.Properties = props.ToArray();
string digest1 = new RequestDigestProvider().GetDigest(request);
//change the request, get a different digest value.
request.Source.Items[0].Content = "*****@*****.**";
string digest2 = new RequestDigestProvider().GetDigest(request);
Assert.AreNotEqual(digest1,digest2);
request.Properties[0].Value = "Change the subject";
string digest3 = new RequestDigestProvider().GetDigest(request);
Assert.AreNotEqual(digest1,digest2);
Assert.AreNotEqual(digest2, digest3);
//Empty subject is OK
request.Properties[0].Value = string.Empty;
string digest4 = new RequestDigestProvider().GetDigest(request);
Assert.AreNotEqual(digest1,digest4);
}
public void GetDigestRoutingItemIsCaseInsensitive()
{
Request request = new Request();
List<CustomProperty> props = new List<CustomProperty>();
props.Add(new CustomProperty("Subject", "This is a subject"));
RoutingEntity sourceRouting = new RoutingEntity();
RoutingItem item = new RoutingItem();
item.Content = "*****@*****.**";
sourceRouting.Items = new RoutingItem[] { item };
request.Source = sourceRouting;
request.Properties = props.ToArray();
string digest1 = new RequestDigestProvider().GetDigest(request);
request.Source.Items[0].Content = request.Source.Items[0].Content.ToUpperInvariant();
string digest2 = new RequestDigestProvider().GetDigest(request);
Assert.AreEqual(digest1,digest2);
}
public void GetDigestMissingSource()
{
Request request = new Request();
List<CustomProperty> props = new List<CustomProperty>();
props.Add(new CustomProperty("Subject", "This is a subject"));
request.Properties = props.ToArray();
request.Source = null; //Invalid, this should cause the throw
try
{
string digest = new RequestDigestProvider().GetDigest(request);
}
catch (ArgumentException)
{
Assert.IsTrue(true, "Expecting method to throw this ArgumentException");
return;
}
Assert.Fail("Should have thrown the ArgumentException");
}
public void GetDigestMissingSubjectProperty()
{
Request request = new Request();
request.Properties = new CustomProperty[0];//Invalid, this should cause the throw
RoutingEntity sourceRouting = new RoutingEntity();
sourceRouting.RoutingType = "Source";
RoutingItem item = new RoutingItem();
item.Content = "*****@*****.**";
sourceRouting.Items = new RoutingItem[] { item };
request.Source = sourceRouting;
try
{
string digest = new RequestDigestProvider().GetDigest(request);
}
catch (ArgumentException)
{
Assert.IsTrue(true, "Expecting method to throw this ArgumentException");
return;
}
Assert.Fail("Should have thrown the ArgumentException");
}
public void GetDigestEmptyRoutingItem()
{
Request request = new Request();
List<CustomProperty> props = new List<CustomProperty>();
props.Add(new CustomProperty("Subject", "This is a subject"));
request.Properties = props.ToArray();
RoutingEntity sourceRouting = new RoutingEntity();
RoutingItem item = new RoutingItem();
item.Content = string.Empty; //Invalid, this should cause the throw
sourceRouting.Items = new RoutingItem[] { item };
request.Source = sourceRouting;
request.Properties = props.ToArray();
try
{
string digest = new RequestDigestProvider().GetDigest(request);
}
catch (ArgumentException)
{
Assert.IsTrue(true, "Expecting method to throw this ArgumentException");
return;
}
Assert.Fail("Should have thrown the ArgumentException");
}
/// <summary>
/// This method checks a certain property is present in the FileHeaders property, and that the value matches
/// a hash of some request-specific properties.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
/// <remarks>
/// Only expect this to be true for messages that were processed by Protect on the client, and then picked up at another
/// egress point such as the MTA or Network monitor.
/// Only messages processed by protect client will have the prerequisite fileheader property.
///</remarks>
private static bool VerifyRequest(Request request)
{
try
{
if (request == null || request.Properties == null)
{
return false;
}
CustomProperty fileHeaderProperty = Array.Find(request.Properties,
cp => cp.Name.Equals("FileHeader", StringComparison.InvariantCultureIgnoreCase));
if (fileHeaderProperty == null || string.IsNullOrEmpty(fileHeaderProperty.Value))
{
return false;
}
HeaderParser parser = new HeaderParser(fileHeaderProperty.Value);
string actualValue = parser.GetHeaderValue(RequestDigestProvider.XHEADER_MESSAGE_PROTECTED);
if (string.IsNullOrEmpty(actualValue))
{
return false;
}
actualValue = actualValue.Trim();
string expectedHashValue = new RequestDigestProvider().GetDigest(request);
if (!actualValue.Equals(expectedHashValue, StringComparison.InvariantCultureIgnoreCase))
{
Logger.LogInfo("A request failed hash validation. It will be processed by all policies. FileHeader contents: " + fileHeaderProperty.Value);
return false;
}
Logger.LogInfo("Request passed hash validation, therefore it was sent via a Protect-compatible email client.");
return true;
}
catch (Exception e)
{
//Some requests passed in here will currently pass unexpected arguments, namely the NetworkMonitor.
//NetMon code is currently passing an unexpected number of routing items.
//In all cases where unexpected arguments are passed or any other problem is encountered,
//treat this as failure to verify the message, therefore returning false.
Logger.LogError("A request failed hash validation due to an exception. It will be processed by all policies.");
Logger.LogError(e);
return false;
}
}
