1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/rpc/metadata.h"
#include "mongo/client/read_preference.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/dbmessage.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/logical_clock.h"
#include "mongo/db/logical_time_validator.h"
#include "mongo/rpc/metadata/client_metadata_ismaster.h"
#include "mongo/rpc/metadata/config_server_metadata.h"
#include "mongo/rpc/metadata/impersonated_user_metadata.h"
#include "mongo/rpc/metadata/logical_time_metadata.h"
#include "mongo/rpc/metadata/sharding_metadata.h"
#include "mongo/rpc/metadata/tracking_metadata.h"
#include "mongo/util/string_map.h"
namespace mongo {
namespace rpc {
BSONObj makeEmptyMetadata() {
return BSONObj();
}
void readRequestMetadata(OperationContext* opCtx, const BSONObj& metadataObj, bool requiresAuth) {
BSONElement readPreferenceElem;
BSONElement configSvrElem;
BSONElement trackingElem;
BSONElement clientElem;
BSONElement logicalTimeElem;
BSONElement impersonationElem;
for (const auto& metadataElem : metadataObj) {
auto fieldName = metadataElem.fieldNameStringData();
if (fieldName == "$readPreference") {
readPreferenceElem = metadataElem;
} else if (fieldName == ConfigServerMetadata::fieldName()) {
configSvrElem = metadataElem;
} else if (fieldName == ClientMetadata::fieldName()) {
clientElem = metadataElem;
} else if (fieldName == TrackingMetadata::fieldName()) {
trackingElem = metadataElem;
} else if (fieldName == LogicalTimeMetadata::fieldName()) {
logicalTimeElem = metadataElem;
} else if (fieldName == kImpersonationMetadataSectionName) {
impersonationElem = metadataElem;
}
}
if (readPreferenceElem) {
ReadPreferenceSetting::get(opCtx) =
uassertStatusOK(ReadPreferenceSetting::fromInnerBSON(readPreferenceElem));
}
readImpersonatedUserMetadata(impersonationElem, opCtx);
uassertStatusOK(ClientMetadataIsMasterState::readFromMetadata(opCtx, clientElem));
ConfigServerMetadata::get(opCtx) =
uassertStatusOK(ConfigServerMetadata::readFromMetadata(configSvrElem));
TrackingMetadata::get(opCtx) =
uassertStatusOK(TrackingMetadata::readFromMetadata(trackingElem));
auto logicalClock = LogicalClock::get(opCtx);
if (logicalClock && logicalClock->isEnabled()) {
auto logicalTimeMetadata =
uassertStatusOK(rpc::LogicalTimeMetadata::readFromMetadata(logicalTimeElem));
auto& signedTime = logicalTimeMetadata.getSignedTime();
if (!requiresAuth &&
AuthorizationManager::get(opCtx->getServiceContext())->isAuthEnabled() &&
(!signedTime.getProof() || *signedTime.getProof() == TimeProofService::TimeProof())) {
AuthorizationSession* authSession = AuthorizationSession::get(opCtx->getClient());
// The client is not authenticated and is not using localhost auth bypass.
if (authSession && !authSession->isAuthenticated() &&
!authSession->isUsingLocalhostBypass()) {
return;
}
}
// LogicalTimeMetadata is default constructed if no cluster time metadata was sent, so a
// default constructed SignedLogicalTime should be ignored.
if (signedTime.getTime() != LogicalTime::kUninitialized) {
auto logicalTimeValidator = LogicalTimeValidator::get(opCtx);
if (!LogicalTimeValidator::isAuthorizedToAdvanceClock(opCtx)) {
if (!logicalTimeValidator) {
uasserted(ErrorCodes::CannotVerifyAndSignLogicalTime,
"Cannot accept logicalTime: " + signedTime.getTime().toString() +
". May not be a part of a sharded cluster");
} else {
uassertStatusOK(logicalTimeValidator->validate(opCtx, signedTime));
}
}
uassertStatusOK(logicalClock->advanceClusterTime(signedTime.getTime()));
}
}
}
namespace {
const auto docSequenceFieldsForCommands = StringMap<std::string>{
{"insert", "documents"}, //
{"update", "updates"},
{"delete", "deletes"},
};
bool isArrayOfObjects(BSONElement array) {
if (array.type() != Array)
return false;
for (auto elem : array.Obj()) {
if (elem.type() != Object)
return false;
}
return true;
}
}
OpMsgRequest upconvertRequest(StringData db, BSONObj cmdObj, int queryFlags) {
cmdObj = cmdObj.getOwned(); // Usually this is a no-op since it is already owned.
auto readPrefContainer = BSONObj();
const StringData firstFieldName = cmdObj.firstElementFieldName();
if (firstFieldName == "$query" || firstFieldName == "query") {
// Commands sent over OP_QUERY specify read preference by putting it at the top level and
// putting the command in a nested field called either query or $query.
// Check if legacyCommand has an invalid $maxTimeMS option.
uassert(ErrorCodes::InvalidOptions,
"cannot use $maxTimeMS query option with commands; use maxTimeMS command option "
"instead",
!cmdObj.hasField("$maxTimeMS"));
if (auto readPref = cmdObj["$readPreference"])
readPrefContainer = readPref.wrap();
cmdObj = cmdObj.firstElement().Obj().shareOwnershipWith(cmdObj);
} else if (auto queryOptions = cmdObj["$queryOptions"]) {
// Mongos rewrites commands with $readPreference to put it in a field nested inside of
// $queryOptions. Its command implementations often forward commands in that format to
// shards. This function is responsible for rewriting it to a format that the shards
// understand.
readPrefContainer = queryOptions.Obj().shareOwnershipWith(cmdObj);
cmdObj = cmdObj.removeField("$queryOptions");
}
if (!readPrefContainer.isEmpty()) {
cmdObj = BSONObjBuilder(std::move(cmdObj)).appendElements(readPrefContainer).obj();
} else if (!cmdObj.hasField("$readPreference") && (queryFlags & QueryOption_SlaveOk)) {
BSONObjBuilder bodyBuilder(std::move(cmdObj));
ReadPreferenceSetting(ReadPreference::SecondaryPreferred).toContainingBSON(&bodyBuilder);
cmdObj = bodyBuilder.obj();
}
uassert(40621, "$db is not allowed in OP_QUERY requests", !cmdObj.hasField("$db"));
// Try to move supported array fields into document sequences.
auto docSequenceIt = docSequenceFieldsForCommands.find(cmdObj.firstElementFieldName());
auto docSequenceElem = docSequenceIt == docSequenceFieldsForCommands.end()
? BSONElement()
: cmdObj[docSequenceIt->second];
if (!isArrayOfObjects(docSequenceElem))
return OpMsgRequest::fromDBAndBody(db, std::move(cmdObj));
auto docSequenceName = docSequenceElem.fieldNameStringData();
// Note: removing field before adding "$db" to avoid the need to copy the potentially large
// array.
auto out = OpMsgRequest::fromDBAndBody(db, cmdObj.removeField(docSequenceName));
out.sequences.push_back({docSequenceName.toString()});
for (auto elem : docSequenceElem.Obj()) {
out.sequences[0].objs.push_back(elem.Obj().shareOwnershipWith(cmdObj));
}
return out;
}
} // namespace rpc
} // namespace mongo
|
