Check for valid URI in publisher information.

In addition to being present, the URL must be a valid URI.

Author: vcsjones

AuthenticodeLint/Rules/PublisherInformationRule.cs

@@ -42,6 +42,12 @@ public RuleResult Validate(Graph<SignerInfo> graph, SignatureLoggerBase verboseW
                     result = RuleResult.Fail;
                     verboseWriter.LogMessage(signature, "Signature does not have an accompanying URL.");
                 }
+                Uri uri;
+                if (!Uri.TryCreate(info.UrlLink, UriKind.Absolute, out uri))
+                {
+                    result = RuleResult.Fail;
+                    verboseWriter.LogMessage(signature, "Signature's accompanying URL is not a valid URI.");
+                }
             }
             return result;
         }