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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include "AclConnectionCounter.h"
#include "Acl.h"
#include "qpid/broker/Connection.h"
#include "qpid/log/Statement.h"
#include "qpid/sys/Mutex.h"
#include <assert.h>
#include <sstream>
using namespace qpid::sys;
namespace qpid {
namespace acl {
//
// This module instantiates a broker::ConnectionObserver and limits client
// connections by counting connections per user name and per client IP address.
//
//
//
//
ConnectionCounter::ConnectionCounter(Acl& a, uint32_t nl, uint32_t hl) :
acl(a), nameLimit(nl), hostLimit(hl) {}
ConnectionCounter::~ConnectionCounter() {}
//
// limitCheckLH
//
// Increment the name's count in map and return a comparison against the limit.
// called with dataLock already taken
//
bool ConnectionCounter::limitCheckLH(
connectCountsMap_t& theMap, const std::string& theName, uint32_t theLimit) {
bool result(true);
if (theLimit > 0) {
connectCountsMap_t::iterator eRef = theMap.find(theName);
if (eRef != theMap.end()) {
uint32_t count = (uint32_t)(*eRef).second + 1;
(*eRef).second = count;
result = count <= theLimit;
} else {
theMap[theName] = 1;
}
}
return result;
}
//
// releaseLH
//
// Decrement the name's count in map.
// called with dataLock already taken
//
void ConnectionCounter::releaseLH(
connectCountsMap_t& theMap, const std::string& theName, uint32_t theLimit) {
if (theLimit > 0) {
connectCountsMap_t::iterator eRef = theMap.find(theName);
if (eRef != theMap.end()) {
uint32_t count = (uint32_t) (*eRef).second;
assert (count > 0);
if (1 == count) {
theMap.erase (eRef);
} else {
(*eRef).second = count - 1;
}
} else {
// User had no connections.
QPID_LOG(notice, "ACL ConnectionCounter Connection for '" << theName
<< "' not found in connection count pool");
}
}
}
//
// connection - called during Connection's constructor
//
void ConnectionCounter::connection(broker::Connection& connection) {
QPID_LOG(trace, "ACL ConnectionCounter connection IP:" << connection.getMgmtId()
<< ", userId:" << connection.getUserId());
Mutex::ScopedLock locker(dataLock);
connectProgressMap[connection.getMgmtId()] = C_CREATED;
}
//
// opened - called when first AMQP frame is received over Connection
//
void ConnectionCounter::opened(broker::Connection& connection) {
QPID_LOG(trace, "ACL ConnectionCounter Opened IP:" << connection.getMgmtId()
<< ", userId:" << connection.getUserId());
Mutex::ScopedLock locker(dataLock);
const std::string& userName( connection.getUserId());
const std::string& hostName(getClientHost(connection.getMgmtId()));
// Bump state from CREATED to OPENED
(void) limitCheckLH(connectProgressMap, connection.getMgmtId(), C_OPENED);
bool nameOk = limitCheckLH(connectByNameMap, userName, nameLimit);
bool hostOk = limitCheckLH(connectByHostMap, hostName, hostLimit);
if (!nameOk) {
// User has too many
acl.reportConnectLimit(userName, hostName);
QPID_LOG(notice, "ACL ConnectionCounter User '" << userName
<< "' exceeded maximum allowed connections");
throw Exception(
QPID_MSG("User '" << userName
<< "' exceeded maximum allowed connections"));
}
if (!hostOk) {
// Host has too many
acl.reportConnectLimit(userName, hostName);
QPID_LOG(notice, "ACL ConnectionCounter Client host '" << hostName
<< "' exceeded maximum allowed connections");
throw Exception(
QPID_MSG("Client host '" << hostName
<< "' exceeded maximum allowed connections"));
}
}
//
// closed - called during Connection's destructor
//
void ConnectionCounter::closed(broker::Connection& connection) {
QPID_LOG(trace, "ACL ConnectionCounter Closed IP:" << connection.getMgmtId()
<< ", userId:" << connection.getUserId());
Mutex::ScopedLock locker(dataLock);
connectCountsMap_t::iterator eRef = connectProgressMap.find(connection.getMgmtId());
if (eRef != connectProgressMap.end()) {
if ((*eRef).second == C_OPENED){
// Normal case: connection was created and opened.
// Decrement in-use counts
releaseLH(connectByNameMap,
connection.getUserId(),
nameLimit);
releaseLH(connectByHostMap,
getClientHost(connection.getMgmtId()),
hostLimit);
} else {
// Connection was created but not opened.
// Don't decrement any connection counts.
}
connectProgressMap.erase(eRef);
} else {
// connection not found in progress map
QPID_LOG(notice, "ACL ConnectionCounter info for '" << connection.getMgmtId()
<< "' not found in connection state pool");
}
}
//
// getClientIp - given a connection's mgmtId return the client host part.
//
// TODO: Ideally this would be a method of the connection itself.
//
std::string ConnectionCounter::getClientHost(const std::string mgmtId)
{
size_t hyphen = mgmtId.find('-');
if (std::string::npos != hyphen) {
size_t colon = mgmtId.find_last_of(':');
if (std::string::npos != colon) {
// trailing colon found
return mgmtId.substr(hyphen+1, colon - hyphen - 1);
} else {
// colon not found - use everything after hyphen
return mgmtId.substr(hyphen+1);
}
}
// no hyphen found - use whole string
assert(false);
return mgmtId;
}
}} // namespace qpid::ha
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