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/*
* libjingle
* Copyright 2004--2005, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "talk/base/firewallsocketserver.h"
#include <cassert>
#include <algorithm>
#include "talk/base/asyncsocket.h"
#include "talk/base/logging.h"
namespace talk_base {
class FirewallSocket : public AsyncSocketAdapter {
public:
FirewallSocket(FirewallSocketServer* server, AsyncSocket* socket, int type)
: AsyncSocketAdapter(socket), server_(server), type_(type) {
}
virtual int Connect(const SocketAddress& addr) {
if (type_ == SOCK_STREAM) {
if (!server_->Check(FP_TCP, GetLocalAddress(), addr)) {
LOG(LS_VERBOSE) << "FirewallSocket outbound TCP connection from "
<< GetLocalAddress().ToSensitiveString() << " to "
<< addr.ToSensitiveString() << " denied";
// TODO: Handle this asynchronously.
SetError(EHOSTUNREACH);
return SOCKET_ERROR;
}
}
return AsyncSocketAdapter::Connect(addr);
}
virtual int Send(const void* pv, size_t cb) {
return SendTo(pv, cb, GetRemoteAddress());
}
virtual int SendTo(const void* pv, size_t cb, const SocketAddress& addr) {
if (type_ == SOCK_DGRAM) {
if (!server_->Check(FP_UDP, GetLocalAddress(), addr)) {
LOG(LS_VERBOSE) << "FirewallSocket outbound UDP packet from "
<< GetLocalAddress().ToSensitiveString() << " to "
<< addr.ToSensitiveString() << " dropped";
return static_cast<int>(cb);
}
}
return AsyncSocketAdapter::SendTo(pv, cb, addr);
}
virtual int Recv(void* pv, size_t cb) {
SocketAddress addr;
return RecvFrom(pv, cb, &addr);
}
virtual int RecvFrom(void* pv, size_t cb, SocketAddress* paddr) {
if (type_ == SOCK_DGRAM) {
while (true) {
int res = AsyncSocketAdapter::RecvFrom(pv, cb, paddr);
if (res <= 0)
return res;
if (server_->Check(FP_UDP, *paddr, GetLocalAddress()))
return res;
LOG(LS_VERBOSE) << "FirewallSocket inbound UDP packet from "
<< paddr->ToSensitiveString() << " to "
<< GetLocalAddress().ToSensitiveString() << " dropped";
}
}
return AsyncSocketAdapter::RecvFrom(pv, cb, paddr);
}
virtual int Listen(int backlog) {
if (!server_->tcp_listen_enabled()) {
LOG(LS_VERBOSE) << "FirewallSocket listen attempt denied";
return -1;
}
return AsyncSocketAdapter::Listen(backlog);
}
virtual AsyncSocket* Accept(SocketAddress* paddr) {
SocketAddress addr;
while (AsyncSocket* sock = AsyncSocketAdapter::Accept(&addr)) {
if (server_->Check(FP_TCP, addr, GetLocalAddress())) {
if (paddr)
*paddr = addr;
return sock;
}
sock->Close();
delete sock;
LOG(LS_VERBOSE) << "FirewallSocket inbound TCP connection from "
<< addr.ToSensitiveString() << " to "
<< GetLocalAddress().ToSensitiveString() << " denied";
}
return 0;
}
private:
FirewallSocketServer* server_;
int type_;
};
FirewallSocketServer::FirewallSocketServer(SocketServer* server,
FirewallManager* manager,
bool should_delete_server)
: server_(server), manager_(manager),
should_delete_server_(should_delete_server),
udp_sockets_enabled_(true), tcp_sockets_enabled_(true),
tcp_listen_enabled_(true) {
if (manager_)
manager_->AddServer(this);
}
FirewallSocketServer::~FirewallSocketServer() {
if (manager_)
manager_->RemoveServer(this);
if (server_ && should_delete_server_) {
delete server_;
server_ = NULL;
}
}
void FirewallSocketServer::AddRule(bool allow, FirewallProtocol p,
FirewallDirection d,
const SocketAddress& addr) {
SocketAddress src, dst;
if (d == FD_IN) {
dst = addr;
} else {
src = addr;
}
AddRule(allow, p, src, dst);
}
void FirewallSocketServer::AddRule(bool allow, FirewallProtocol p,
const SocketAddress& src,
const SocketAddress& dst) {
Rule r;
r.allow = allow;
r.p = p;
r.src = src;
r.dst = dst;
CritScope scope(&crit_);
rules_.push_back(r);
}
void FirewallSocketServer::ClearRules() {
CritScope scope(&crit_);
rules_.clear();
}
bool FirewallSocketServer::Check(FirewallProtocol p,
const SocketAddress& src,
const SocketAddress& dst) {
CritScope scope(&crit_);
for (size_t i = 0; i < rules_.size(); ++i) {
const Rule& r = rules_[i];
if ((r.p != p) && (r.p != FP_ANY))
continue;
if ((r.src.ipaddr() != src.ipaddr()) && !r.src.IsNil())
continue;
if ((r.src.port() != src.port()) && (r.src.port() != 0))
continue;
if ((r.dst.ipaddr() != dst.ipaddr()) && !r.dst.IsNil())
continue;
if ((r.dst.port() != dst.port()) && (r.dst.port() != 0))
continue;
return r.allow;
}
return true;
}
Socket* FirewallSocketServer::CreateSocket(int type) {
return CreateSocket(AF_INET, type);
}
Socket* FirewallSocketServer::CreateSocket(int family, int type) {
return WrapSocket(server_->CreateAsyncSocket(family, type), type);
}
AsyncSocket* FirewallSocketServer::CreateAsyncSocket(int type) {
return CreateAsyncSocket(AF_INET, type);
}
AsyncSocket* FirewallSocketServer::CreateAsyncSocket(int family, int type) {
return WrapSocket(server_->CreateAsyncSocket(family, type), type);
}
AsyncSocket* FirewallSocketServer::WrapSocket(AsyncSocket* sock, int type) {
if (!sock ||
(type == SOCK_STREAM && !tcp_sockets_enabled_) ||
(type == SOCK_DGRAM && !udp_sockets_enabled_)) {
LOG(LS_VERBOSE) << "FirewallSocketServer socket creation denied";
delete sock;
return NULL;
}
return new FirewallSocket(this, sock, type);
}
FirewallManager::FirewallManager() {
}
FirewallManager::~FirewallManager() {
assert(servers_.empty());
}
void FirewallManager::AddServer(FirewallSocketServer* server) {
CritScope scope(&crit_);
servers_.push_back(server);
}
void FirewallManager::RemoveServer(FirewallSocketServer* server) {
CritScope scope(&crit_);
servers_.erase(std::remove(servers_.begin(), servers_.end(), server),
servers_.end());
}
void FirewallManager::AddRule(bool allow, FirewallProtocol p,
FirewallDirection d, const SocketAddress& addr) {
CritScope scope(&crit_);
for (std::vector<FirewallSocketServer*>::const_iterator it =
servers_.begin(); it != servers_.end(); ++it) {
(*it)->AddRule(allow, p, d, addr);
}
}
void FirewallManager::ClearRules() {
CritScope scope(&crit_);
for (std::vector<FirewallSocketServer*>::const_iterator it =
servers_.begin(); it != servers_.end(); ++it) {
(*it)->ClearRules();
}
}
} // namespace talk_base
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