Reject certificates that are valid for too long.

net/cert/cert_verify_proc.cc

 // Copyright (c) 2012 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.
 
 #include "net/cert/cert_verify_proc.h"
 
+#include <stdint.h>
+
 #include "base/basictypes.h"
 #include "base/metrics/histogram.h"
 #include "base/sha1.h"
 #include "base/strings/stringprintf.h"
+#include "base/time/time.h"
 #include "build/build_config.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_util.h"
 #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
 #include "net/cert/cert_status_flags.h"
 #include "net/cert/cert_verifier.h"
 #include "net/cert/cert_verify_result.h"
 #include "net/cert/crl_set.h"
 #include "net/cert/x509_certificate.h"
 #include "url/url_canon.h"
 
 #if defined(USE_NSS) || defined(OS_IOS)
 #include "net/cert/cert_verify_proc_nss.h"
 #elif defined(USE_OPENSSL_CERTS) && !defined(OS_ANDROID)
 #include "net/cert/cert_verify_proc_openssl.h"
 #elif defined(OS_ANDROID)
 #include "net/cert/cert_verify_proc_android.h"
 #elif defined(OS_MACOSX)
 #include "net/cert/cert_verify_proc_mac.h"
 #elif defined(OS_WIN)
 #include "net/cert/cert_verify_proc_win.h"
 #else
 #error Implement certificate verification.
 #endif
 
-
 namespace net {
 
 namespace {
 
 // Constants used to build histogram names
 const char kLeafCert[] = "Leaf";
 const char kIntermediateCert[] = "Intermediate";
 const char kRootCert[] = "Root";
 // Matches the order of X509Certificate::PublicKeyType
 const char* const kCertTypeStrings[] = {
@@ skipping 222 matching lines @@
   // hosts. While the CA/Browser Forum Baseline Requirements (v1.1) permit
   // these to be issued until 1 November 2015, they represent a real risk for
   // the deployment of gTLDs and are being phased out ahead of the hard
   // deadline.
   if (verify_result->is_issued_by_known_root && IsHostnameNonUnique(hostname)) {
     verify_result->cert_status |= CERT_STATUS_NON_UNIQUE_NAME;
     // CERT_STATUS_NON_UNIQUE_NAME will eventually become a hard error. For
     // now treat it as a warning and do not map it to an error return value.
   }
 
+  // Flag certificates using too long validity periods.
+  if (verify_result->is_issued_by_known_root && HasTooLongValidity(*cert)) {
+    verify_result->cert_status |= CERT_STATUS_VALIDITY_TOO_LONG;
+    if (rv == OK)
+      rv = MapCertStatusToNetError(verify_result->cert_status);
+  }
+
   return rv;
 }
 
 // static
 bool CertVerifyProc::IsBlacklisted(X509Certificate* cert) {
   static const unsigned kComodoSerialBytes = 16;
   static const uint8 kComodoSerials[][kComodoSerialBytes] = {
     // Not a real certificate. For testing only.
     {0x07,0x7a,0x59,0xbc,0xd5,0x34,0x59,0x60,0x1c,0xa6,0x90,0x72,0x67,0xa6,0xdd,0x1c},
 
@@ skipping 318 matching lines @@
           if (!CheckNameConstraints(dns_names, kLimits[i].domains))
             return true;
         }
       }
     }
   }
 
   return false;
 }
 
+// static
+bool CertVerifyProc::HasTooLongValidity(const X509Certificate& cert) {
+  const base::Time& start = cert.valid_start();
+  const base::Time& expiry = cert.valid_expiry();
+  if (start.is_max() || start.is_null() || expiry.is_max() ||
+      expiry.is_null() || start > expiry) {
+    return true;
+  }
+
+  base::Time::Exploded exploded_start;
+  base::Time::Exploded exploded_expiry;
+  cert.valid_start().UTCExplode(&exploded_start);
+  cert.valid_expiry().UTCExplode(&exploded_expiry);
+
+  if (exploded_expiry.year - exploded_start.year > 10)
+    return true;
+
+  int month_diff = (exploded_expiry.year - exploded_start.year) * 12 +
+                   (exploded_expiry.month - exploded_start.month);
+
+  // Add any remainder as a full month.
+  if (exploded_expiry.day_of_month > exploded_start.day_of_month)
+    ++month_diff;
+
+  static const base::Time time_2012_07_01 =
+      base::Time::FromUTCExploded({2012, 7, 0, 1, 0, 0, 0, 0});
+  static const base::Time time_2015_04_01 =
+      base::Time::FromUTCExploded({2015, 4, 0, 1, 0, 0, 0, 0});
+  static const base::Time time_2019_07_01 =
+      base::Time::FromUTCExploded({2019, 7, 0, 1, 0, 0, 0, 0});
+
+  // For certificates issued before the BRs took effect.
+  if (start < time_2012_07_01 && (month_diff > 120 || expiry > time_2019_07_01))
+    return true;
+
+  // For certificates issued after 1 July 2012: 60 months.
+  if (start >= time_2012_07_01 && month_diff > 60)
+    return true;
+
+  // For certificates issued after 1 April 2015: 39 months.
+  if (start >= time_2015_04_01 && month_diff > 39)
+    return true;
+
+  return false;
+}
+
 }  // namespace net