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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 "chrome/browser/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 using browser_sync::Cryptographer; | |
| 13 | |
| 14 namespace sync_api { | |
| 15 | |
| 16 sync_pb::PasswordSpecificsData* DecryptPasswordSpecifics( | |
| 17 const sync_pb::EntitySpecifics& specifics, Cryptographer* crypto) { | |
| 18 if (!specifics.has_password()) | |
| 19 return NULL; | |
| 20 const sync_pb::PasswordSpecifics& password_specifics = specifics.password(); | |
| 21 if (!password_specifics.has_encrypted()) | |
| 22 return NULL; | |
| 23 const sync_pb::EncryptedData& encrypted = password_specifics.encrypted(); | |
| 24 scoped_ptr<sync_pb::PasswordSpecificsData> data( | |
| 25 new sync_pb::PasswordSpecificsData); | |
| 26 if (!crypto->Decrypt(encrypted, data.get())) | |
| 27 return NULL; | |
| 28 return data.release(); | |
| 29 } | |
| 30 | |
| 31 // The list of names which are reserved for use by the server. | |
| 32 static const char* kForbiddenServerNames[] = { "", ".", ".." }; | |
| 33 | |
| 34 // When taking a name from the syncapi, append a space if it matches the | |
| 35 // pattern of a server-illegal name followed by zero or more spaces. | |
| 36 void SyncAPINameToServerName(const std::string& sync_api_name, | |
| 37 std::string* out) { | |
| 38 *out = sync_api_name; | |
| 39 if (IsNameServerIllegalAfterTrimming(*out)) | |
| 40 out->append(" "); | |
| 41 } | |
| 42 | |
| 43 // Checks whether |name| is a server-illegal name followed by zero or more space | |
| 44 // characters. The three server-illegal names are the empty string, dot, and | |
| 45 // dot-dot. Very long names (>255 bytes in UTF-8 Normalization Form C) are | |
| 46 // also illegal, but are not considered here. | |
| 47 bool IsNameServerIllegalAfterTrimming(const std::string& name) { | |
| 48 size_t untrimmed_count = name.find_last_not_of(' ') + 1; | |
| 49 for (size_t i = 0; i < arraysize(kForbiddenServerNames); ++i) { | |
| 50 if (name.compare(0, untrimmed_count, kForbiddenServerNames[i]) == 0) | |
| 51 return true; | |
| 52 } | |
| 53 return false; | |
| 54 } | |
| 55 | |
| 56 // Compare the values of two EntitySpecifics, accounting for encryption. | |
| 57 bool AreSpecificsEqual(const browser_sync::Cryptographer* cryptographer, | |
| 58 const sync_pb::EntitySpecifics& left, | |
| 59 const sync_pb::EntitySpecifics& right) { | |
| 60 // Note that we can't compare encrypted strings directly as they are seeded | |
| 61 // with a random value. | |
| 62 std::string left_plaintext, right_plaintext; | |
| 63 if (left.has_encrypted()) { | |
| 64 if (!cryptographer->CanDecrypt(left.encrypted())) { | |
| 65 NOTREACHED() << "Attempting to compare undecryptable data."; | |
| 66 return false; | |
| 67 } | |
| 68 left_plaintext = cryptographer->DecryptToString(left.encrypted()); | |
| 69 } else { | |
| 70 left_plaintext = left.SerializeAsString(); | |
| 71 } | |
| 72 if (right.has_encrypted()) { | |
| 73 if (!cryptographer->CanDecrypt(right.encrypted())) { | |
| 74 NOTREACHED() << "Attempting to compare undecryptable data."; | |
| 75 return false; | |
| 76 } | |
| 77 right_plaintext = cryptographer->DecryptToString(right.encrypted()); | |
| 78 } else { | |
| 79 right_plaintext = right.SerializeAsString(); | |
| 80 } | |
| 81 if (left_plaintext == right_plaintext) { | |
| 82 return true; | |
| 83 } | |
| 84 return false; | |
| 85 } | |
| 86 | |
| 87 } // namespace sync_api | |
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