Find reasons for the SSL common name invalid error.

chrome/browser/ssl/ssl_error_classification.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SSL_SSL_ERROR_CLASSIFICATION_H_
 #define CHROME_BROWSER_SSL_SSL_ERROR_CLASSIFICATION_H_
 
+#include <string>
+#include <vector>
+
 #include "base/time/time.h"
 #include "net/cert/x509_certificate.h"
+#include "url/gurl.h"
 
 // This class calculates the severity scores for the different type of SSL
 // errors.
 class SSLErrorClassification {
  public:
   SSLErrorClassification(base::Time current_time,
+                         const GURL& url,
                          const net::X509Certificate& cert);
   ~SSLErrorClassification();
 
-  // This method checks whether the user clock is in the past or not.
+  // This method checks whether the system time is in the past.
   static bool IsUserClockInThePast(base::Time time_now);
 
   // This method checks whether the system time is too far in the future or
   // the user is using a version of Chrome which is more than 1 year old.
   static bool IsUserClockInTheFuture(base::Time time_now);
 
   // A method which calculates the severity score when the ssl error is
   // CERT_DATE_INVALID.
   float InvalidDateSeverityScore() const;
 
-  static void RecordUMAStatistics(bool overridable);
+  // A method which calculates the severity score when the ssl error is
+  // CERT_COMMON_NAME_INVALID.
+  float InvalidCommonNameSeverityScore() const;
+
+  void RecordUMAStatistics(bool overridable, int cert_error);
   base::TimeDelta TimePassedSinceExpiry() const;
 
  private:
-  FRIEND_TEST_ALL_PREFIXES(SSLErrorClassification, TestDateInvalidScore);
+  FRIEND_TEST_ALL_PREFIXES(SSLErrorClassificationTest, TestDateInvalidScore);
+  FRIEND_TEST_ALL_PREFIXES(SSLErrorClassificationTest, TestNameMismatch);
+  FRIEND_TEST_ALL_PREFIXES(SSLErrorClassificationTest,
+                           TestHostNameHasKnownTLD);
+
+  typedef std::vector<std::string> Tokens;
+
+  // This method checks whether the hostname has a known Top Level Domain or
+  // not.
+  static bool IsHostNameKnownTLD(const std::string& host_name);
+
+  // A certificate for bank.com does not work for www.bank.com and vice versa.
+  // This method checks whteher the error is caused because of "www" difference
+  // between the host name and any DNS name given in the CN or SAN fields of
+  // the SSL certificate.
+  bool IsWWWSubDomainMatch() const;
+
+  // Returns true if |child| is a subdomain of any of the |potential_parents|.
+  bool NameUnderAnyNames(const Tokens& child,
+                         const std::vector<Tokens>& potential_parents) const;
+
+  // Returns true if any of the |potential_children| is a subdomain of any of
+  // the |parent|.
+  bool AnyNamesUnderName(const std::vector<Tokens>& potential_children,
+                         const Tokens& parent) const;
+
+  // This method checks whether the hostname is too broad for the scope of a
+  // wildcard certificate or not. For e.g. it returns true if the host name of
+  // the URL is "a.b.example.com" and the DNS name in the CN or SAN field of the
+  // SSL certificate is "*.example.com". But, it returns false for the hostname
+  // "b.example.com".
+  bool IsSubDomainOutsideWildcard(const Tokens& host_name_tokens) const;
+  bool IsSelfSigned() const;
 
   float CalculateScoreTimePassedSinceExpiry() const;
 
+  std::vector<Tokens> GetTokenizedDNSNames(
+      std::vector<std::string>& dns_names) const;

[radhikabhar, 2014/07/24 18:05:13]

I did not use Tokens out here because these are the dns_names of the certificate
in the string field. they are not tokenized yet.

+
   // This stores the current time.
   base::Time current_time_;
 
+  const GURL& request_url_;
+
   // This stores the certificate.
   const net::X509Certificate& cert_;
 };
 
 #endif  // CHROME_BROWSER_SSL_SSL_ERROR_CLASSIFICATION_H_