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
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
|
/**
* Copyright (C) 2008-2016 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kCommand
#include "mongo/platform/basic.h"
#include <vector>
#include "mongo/bson/util/bson_check.h"
#include "mongo/bson/util/bson_extract.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/authorization_manager_global.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/catalog/document_validation.h"
#include "mongo/db/catalog/uuid_catalog.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/oplog_application_checks.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repl/apply_ops.h"
#include "mongo/db/repl/oplog.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/repl/replication_coordinator_global.h"
#include "mongo/db/service_context.h"
#include "mongo/util/log.h"
#include "mongo/util/scopeguard.h"
#include "mongo/util/uuid.h"
namespace mongo {
namespace {
bool checkCOperationType(const BSONObj& opObj, const StringData opName) {
BSONElement opTypeElem = opObj["op"];
checkBSONType(BSONType::String, opTypeElem);
const StringData opType = opTypeElem.checkAndGetStringData();
if (opType == "c"_sd) {
BSONElement oElem = opObj["o"];
checkBSONType(BSONType::Object, oElem);
BSONObj o = oElem.Obj();
if (o.firstElement().fieldNameStringData() == opName) {
return true;
}
}
return false;
};
/**
* Returns kNeedsSuperuser, if the provided applyOps command contains an empty applyOps command or
* createCollection/renameCollection commands are mixed in applyOps batch.
*
* Returns kNeedForceAndUseUUID if an operation contains a UUID, and will create a collection with
* the user-specified UUID.
*
* Returns kNeedsUseUUID if the operation contains a UUID.
*
* Returns kOk if no conditions which must be specially handled are detected.
*
* May throw exceptions if the input is malformed.
*/
OplogApplicationValidity validateApplyOpsCommand(const BSONObj& cmdObj) {
const size_t maxApplyOpsDepth = 10;
std::stack<std::pair<size_t, BSONObj>> toCheck;
auto operationContainsUUID = [](const BSONObj& opObj) {
auto anyTopLevelElementIsUUID = [](const BSONObj& opObj) {
for (const BSONElement opElement : opObj) {
if (opElement.type() == BSONType::BinData &&
opElement.binDataType() == BinDataType::newUUID) {
return true;
}
}
return false;
};
if (anyTopLevelElementIsUUID(opObj)) {
return true;
}
BSONElement opTypeElem = opObj["op"];
checkBSONType(BSONType::String, opTypeElem);
const StringData opType = opTypeElem.checkAndGetStringData();
if (opType == "c"_sd) {
BSONElement oElem = opObj["o"];
checkBSONType(BSONType::Object, oElem);
BSONObj o = oElem.Obj();
if (anyTopLevelElementIsUUID(o)) {
return true;
}
}
return false;
};
OplogApplicationValidity ret = OplogApplicationValidity::kOk;
// Insert the top level applyOps command into the stack.
toCheck.emplace(std::make_pair(0, cmdObj));
while (!toCheck.empty()) {
size_t depth;
BSONObj applyOpsObj;
std::tie(depth, applyOpsObj) = toCheck.top();
toCheck.pop();
checkBSONType(BSONType::Array, applyOpsObj.firstElement());
// Check if the applyOps command is empty. This is probably not something that should
// happen, so require a superuser to do this.
if (applyOpsObj.firstElement().Array().empty()) {
return OplogApplicationValidity::kNeedsSuperuser;
}
// createCollection and renameCollection are only allowed to be applied
// individually. Ensure there is no create/renameCollection in a batch
// of size greater than 1.
if (applyOpsObj.firstElement().Array().size() > 1) {
for (const BSONElement& e : applyOpsObj.firstElement().Array()) {
checkBSONType(BSONType::Object, e);
auto oplogEntry = e.Obj();
if (checkCOperationType(oplogEntry, "create"_sd) ||
checkCOperationType(oplogEntry, "renameCollection"_sd)) {
return OplogApplicationValidity::kNeedsSuperuser;
}
}
}
// For each applyOps command, iterate the ops.
for (BSONElement element : applyOpsObj.firstElement().Array()) {
checkBSONType(BSONType::Object, element);
BSONObj opObj = element.Obj();
bool opHasUUIDs = operationContainsUUID(opObj);
if (serverGlobalParams.featureCompatibility.getVersion() ==
ServerGlobalParams::FeatureCompatibility::Version::kFullyDowngradedTo34) {
uassert(ErrorCodes::OplogOperationUnsupported,
"applyOps with UUID requires upgrading to FeatureCompatibilityVersion 3.6",
!opHasUUIDs);
}
// If the op uses any UUIDs at all then the user must possess extra privileges.
if (opHasUUIDs && ret == OplogApplicationValidity::kOk)
ret = OplogApplicationValidity::kNeedsUseUUID;
if (opHasUUIDs && checkCOperationType(opObj, "create"_sd)) {
// If the op is 'c' and forces the server to ingest a collection
// with a specific, user defined UUID.
ret = OplogApplicationValidity::kNeedsForceAndUseUUID;
}
// If the op contains a nested applyOps...
if (checkCOperationType(opObj, "applyOps"_sd)) {
// And we've recursed too far, then bail out.
uassert(ErrorCodes::FailedToParse,
"Too many nested applyOps",
depth < maxApplyOpsDepth);
// Otherwise, if the op contains an applyOps, but we haven't recursed too far:
// extract the applyOps command, and insert it into the stack.
checkBSONType(BSONType::Object, opObj["o"]);
BSONObj oObj = opObj["o"].Obj();
toCheck.emplace(std::make_pair(depth + 1, std::move(oObj)));
}
}
}
return ret;
}
class ApplyOpsCmd : public BasicCommand {
public:
ApplyOpsCmd() : BasicCommand("applyOps") {}
bool slaveOk() const override {
return false;
}
bool supportsWriteConcern(const BSONObj& cmd) const override {
return true;
}
void help(std::stringstream& help) const override {
help << "internal (sharding)\n{ applyOps : [ ] , preCondition : [ { ns : ... , q : ... , "
"res : ... } ] }";
}
Status checkAuthForOperation(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmdObj) override {
OplogApplicationValidity validity = validateApplyOpsCommand(cmdObj);
return OplogApplicationChecks::checkAuthForCommand(opCtx, dbname, cmdObj, validity);
}
bool run(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmdObj,
BSONObjBuilder& result) override {
validateApplyOpsCommand(cmdObj);
boost::optional<DisableDocumentValidation> maybeDisableValidation;
if (shouldBypassDocumentValidationForCommand(cmdObj))
maybeDisableValidation.emplace(opCtx);
auto status = OplogApplicationChecks::checkOperationArray(cmdObj.firstElement());
if (!status.isOK()) {
return CommandHelpers::appendCommandStatus(result, status);
}
// TODO (SERVER-30217): When a write concern is provided to the applyOps command, we
// normally wait on the OpTime of whichever operation successfully completed last. This is
// erroneous, however, if the last operation in the array happens to be a write no-op and
// thus isn’t assigned an OpTime. Let the second to last operation in the applyOps be write
// A, the last operation in applyOps be write B. Let B do a no-op write and let the
// operation that caused B to be a no-op be C. If C has an OpTime after A but before B,
// then we won’t wait for C to be replicated and it could be rolled back, even though B
// was acknowledged. To fix this, we should wait for replication of the node’s last applied
// OpTime if the last write operation was a no-op write.
// We set the OplogApplication::Mode argument based on the mode argument given in the
// command object. If no mode is given, default to the 'kApplyOpsCmd' mode.
repl::OplogApplication::Mode oplogApplicationMode =
repl::OplogApplication::Mode::kApplyOpsCmd; // the default mode.
std::string oplogApplicationModeString;
status = bsonExtractStringField(
cmdObj, ApplyOps::kOplogApplicationModeFieldName, &oplogApplicationModeString);
if (status.isOK()) {
auto modeSW = repl::OplogApplication::parseMode(oplogApplicationModeString);
if (!modeSW.isOK()) {
// Unable to parse the mode argument.
return CommandHelpers::appendCommandStatus(
result,
modeSW.getStatus().withContext(str::stream() << "Could not parse " +
ApplyOps::kOplogApplicationModeFieldName));
}
oplogApplicationMode = modeSW.getValue();
} else if (status != ErrorCodes::NoSuchKey) {
// NoSuchKey means the user did not supply a mode.
return CommandHelpers::appendCommandStatus(
result,
status.withContext(str::stream() << "Could not parse out "
<< ApplyOps::kOplogApplicationModeFieldName));
}
auto applyOpsStatus = CommandHelpers::appendCommandStatus(
result, applyOps(opCtx, dbname, cmdObj, oplogApplicationMode, &result));
return applyOpsStatus;
}
} applyOpsCmd;
} // namespace
} // namespace mongo
|