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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "sync/internal_api/syncapi_internal.h"
      6 
      7 #include "base/memory/scoped_ptr.h"
      8 #include "sync/protocol/password_specifics.pb.h"
      9 #include "sync/protocol/sync.pb.h"
     10 #include "sync/util/cryptographer.h"
     11 
     12 namespace syncer {
     13 
     14 sync_pb::PasswordSpecificsData* DecryptPasswordSpecifics(
     15     const sync_pb::EntitySpecifics& specifics, Cryptographer* crypto) {
     16   if (!specifics.has_password())
     17     return NULL;
     18   const sync_pb::PasswordSpecifics& password_specifics = specifics.password();
     19   if (!password_specifics.has_encrypted())
     20     return NULL;
     21   const sync_pb::EncryptedData& encrypted = password_specifics.encrypted();
     22   scoped_ptr<sync_pb::PasswordSpecificsData> data(
     23       new sync_pb::PasswordSpecificsData);
     24   if (!crypto->Decrypt(encrypted, data.get()))
     25     return NULL;
     26   return data.release();
     27 }
     28 
     29 // The list of names which are reserved for use by the server.
     30 static const char* kForbiddenServerNames[] = { "", ".", ".." };
     31 
     32 // When taking a name from the syncapi, append a space if it matches the
     33 // pattern of a server-illegal name followed by zero or more spaces.
     34 void SyncAPINameToServerName(const std::string& syncer_name,
     35                              std::string* out) {
     36   *out = syncer_name;
     37   if (IsNameServerIllegalAfterTrimming(*out))
     38     out->append(" ");
     39 }
     40 
     41 // Checks whether |name| is a server-illegal name followed by zero or more space
     42 // characters.  The three server-illegal names are the empty string, dot, and
     43 // dot-dot.  Very long names (>255 bytes in UTF-8 Normalization Form C) are
     44 // also illegal, but are not considered here.
     45 bool IsNameServerIllegalAfterTrimming(const std::string& name) {
     46   size_t untrimmed_count = name.find_last_not_of(' ') + 1;
     47   for (size_t i = 0; i < arraysize(kForbiddenServerNames); ++i) {
     48     if (name.compare(0, untrimmed_count, kForbiddenServerNames[i]) == 0)
     49       return true;
     50   }
     51   return false;
     52 }
     53 
     54 // Compare the values of two EntitySpecifics, accounting for encryption.
     55 bool AreSpecificsEqual(const Cryptographer* cryptographer,
     56                        const sync_pb::EntitySpecifics& left,
     57                        const sync_pb::EntitySpecifics& right) {
     58   // Note that we can't compare encrypted strings directly as they are seeded
     59   // with a random value.
     60   std::string left_plaintext, right_plaintext;
     61   if (left.has_encrypted()) {
     62     if (!cryptographer->CanDecrypt(left.encrypted())) {
     63       NOTREACHED() << "Attempting to compare undecryptable data.";
     64       return false;
     65     }
     66     left_plaintext = cryptographer->DecryptToString(left.encrypted());
     67   } else {
     68     left_plaintext = left.SerializeAsString();
     69   }
     70   if (right.has_encrypted()) {
     71     if (!cryptographer->CanDecrypt(right.encrypted())) {
     72       NOTREACHED() << "Attempting to compare undecryptable data.";
     73       return false;
     74     }
     75     right_plaintext = cryptographer->DecryptToString(right.encrypted());
     76   } else {
     77     right_plaintext = right.SerializeAsString();
     78   }
     79   if (left_plaintext == right_plaintext) {
     80     return true;
     81   }
     82   return false;
     83 }
     84 
     85 }  // namespace syncer
     86