Parse HPKP report-uri and persist in TransportSecurityPersister

net/http/http_security_headers.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 "base/base64.h"
 #include "base/basictypes.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_tokenizer.h"
 #include "base/strings/string_util.h"
 #include "net/http/http_security_headers.h"
@@ skipping 74 matching lines @@
   if (pins.size() < 2)
     return false;
 
   if (from_cert_chain.empty())
     return false;
 
   return IsBackupPinPresent(pins, from_cert_chain) &&
          HashesIntersect(pins, from_cert_chain);
 }
 
-std::string Strip(const std::string& source) {
-  if (source.empty())
-    return source;
-
-  std::string::const_iterator start = source.begin();
-  std::string::const_iterator end = source.end();
-  HttpUtil::TrimLWS(&start, &end);
-  return std::string(start, end);
-}
-
-typedef std::pair<std::string, std::string> StringPair;
-
-StringPair Split(const std::string& source, char delimiter) {
-  StringPair pair;
-  size_t point = source.find(delimiter);
-
-  pair.first = source.substr(0, point);
-  if (std::string::npos != point)
-    pair.second = source.substr(point + 1);
-
-  return pair;
-}
-
 bool ParseAndAppendPin(const std::string& value,
                        HashValueTag tag,
                        HashValueVector* hashes) {
   // Pins are always quoted.
   if (value.empty() || !HttpUtil::IsQuote(value[0]))
     return false;
 
   std::string unquoted = HttpUtil::Unquote(value);
   if (unquoted.empty())
       return false;
@@ skipping 138 matching lines @@
     case START:
     case AFTER_MAX_AGE_LABEL:
     case AFTER_MAX_AGE_EQUALS:
       return false;
     default:
       NOTREACHED();
       return false;
   }
 }
 
-// "Public-Key-Pins" ":"
+// "Public-Key-Pins[-Report-Only]" ":"
 //     "max-age" "=" delta-seconds ";"
 //     "pin-" algo "=" base64 [ ";" ... ]
+//     [ ";" "includeSubdomains" ]
+//     [ ";" "report-uri" "=" uri-reference ]
 bool ParseHPKPHeader(const std::string& value,
                      const HashValueVector& chain_hashes,
                      base::TimeDelta* max_age,
                      bool* include_subdomains,
-                     HashValueVector* hashes) {
+                     HashValueVector* hashes,
+                     std::string* report_uri) {
   bool parsed_max_age = false;
   bool include_subdomains_candidate = false;
   uint32 max_age_candidate = 0;
   HashValueVector pins;
 
-  std::string source = value;
+  HttpUtil::NameValuePairsIterator name_value_pairs(
+      value.begin(), value.end(), ';',
+      HttpUtil::NameValuePairsIterator::VALUES_OPTIONAL);
 
-  while (!source.empty()) {
-    StringPair semicolon = Split(source, ';');
-    semicolon.first = Strip(semicolon.first);
-    semicolon.second = Strip(semicolon.second);
-    StringPair equals = Split(semicolon.first, '=');
-    equals.first = Strip(equals.first);
-    equals.second = Strip(equals.second);
-
-    if (base::LowerCaseEqualsASCII(equals.first, "max-age")) {
-      if (equals.second.empty() ||
-          !MaxAgeToInt(equals.second.begin(), equals.second.end(),
-                       &max_age_candidate)) {
+  while (name_value_pairs.GetNext()) {
+    if (base::LowerCaseEqualsASCII(name_value_pairs.name(), "max-age")) {
+      if (name_value_pairs.value().empty() ||
+          !MaxAgeToInt(name_value_pairs.value_begin(),
+                       name_value_pairs.value_end(), &max_age_candidate)) {
         return false;
       }
       parsed_max_age = true;
-    } else if (base::LowerCaseEqualsASCII(equals.first, "pin-sha1")) {
-      if (!ParseAndAppendPin(equals.second, HASH_VALUE_SHA1, &pins))
+    } else if (base::LowerCaseEqualsASCII(name_value_pairs.name(),
+                                          "pin-sha1")) {
+      if (!ParseAndAppendPin(name_value_pairs.raw_value(), HASH_VALUE_SHA1,
+                             &pins)) {
         return false;
-    } else if (base::LowerCaseEqualsASCII(equals.first, "pin-sha256")) {
-      if (!ParseAndAppendPin(equals.second, HASH_VALUE_SHA256, &pins))
+      }
+    } else if (base::LowerCaseEqualsASCII(name_value_pairs.name(),
+                                          "pin-sha256")) {
+      if (!ParseAndAppendPin(name_value_pairs.raw_value(), HASH_VALUE_SHA256,
+                             &pins)) {
         return false;
-    } else if (base::LowerCaseEqualsASCII(equals.first, "includesubdomains")) {
+      }
+    } else if (base::LowerCaseEqualsASCII(name_value_pairs.name(),
+                                          "includesubdomains")) {
       include_subdomains_candidate = true;
+    } else if (base::LowerCaseEqualsASCII(name_value_pairs.name(),
+                                          "report-uri")) {
+      // report-uris are always quoted.
+      if (name_value_pairs.raw_value().empty() ||
+          !HttpUtil::IsQuote(name_value_pairs.raw_value()[0]) ||

[davidben, 2015/07/15 22:21:06]

Maybe expose value_is_quoted() out of NameValuePairsIterator. Then this can just
be.

  if (!name_value_pairs.value_is_quoted())
    return false;
  *report_uri = name_value_pairs.value();
  if (report_uri->empty())
    return false;


[*] Hrm. I bet we should be using base::StringPiece now. Not for this CL though.
"Oh, by the way, while you're here, how about you refactor the universe?" is not
actually reasonable. :-)

[estark, 2015/07/16 00:07:01]

Done.

+          name_value_pairs.raw_value()[0] !=
+              *name_value_pairs.raw_value().rbegin()) {
+        return false;
+      }
+
+      *report_uri = HttpUtil::Unquote(name_value_pairs.value());

[davidben, 2015/07/15 22:21:06]

Bug? I think this should be Unquote(raw_value) or just value.

[estark, 2015/07/16 00:07:00]

Done.

+      if (report_uri->empty())
+        return false;
     } else {
       // Silently ignore unknown directives for forward compatibility.
     }
+  }
 
-    source = semicolon.second;
-  }
+  if (!name_value_pairs.valid())
+    return false;
 
   if (!parsed_max_age)
     return false;
 
   if (!IsPinListValid(pins, chain_hashes))
     return false;
 
   *max_age = base::TimeDelta::FromSeconds(max_age_candidate);
   *include_subdomains = include_subdomains_candidate;
   hashes->swap(pins);
 
   return true;
 }
 
 }  // namespace net