You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 

259 lines
8.3 KiB

// Copyright (c) 2015-2017 The Starwels developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <httprpc.h>
#include <base58.h>
#include <chainparams.h>
#include <httpserver.h>
#include <rpc/protocol.h>
#include <rpc/server.h>
#include <random.h>
#include <sync.h>
#include <util.h>
#include <utilstrencodings.h>
#include <ui_interface.h>
#include <crypto/hmac_sha256.h>
#include <stdio.h>
#include <boost/algorithm/string.hpp> // boost::trim
/** WWW-Authenticate to present with 401 Unauthorized response */
static const char* WWW_AUTH_HEADER_DATA = "Basic realm=\"jsonrpc\"";
/** Simple one-shot callback timer to be used by the RPC mechanism to e.g.
* re-lock the wallet.
*/
class HTTPRPCTimer : public RPCTimerBase
{
public:
HTTPRPCTimer(struct event_base* eventBase, std::function<void(void)>& func, int64_t millis) :
ev(eventBase, false, func)
{
struct timeval tv;
tv.tv_sec = millis/1000;
tv.tv_usec = (millis%1000)*1000;
ev.trigger(&tv);
}
private:
HTTPEvent ev;
};
class HTTPRPCTimerInterface : public RPCTimerInterface
{
public:
explicit HTTPRPCTimerInterface(struct event_base* _base) : base(_base)
{
}
const char* Name() override
{
return "HTTP";
}
RPCTimerBase* NewTimer(std::function<void(void)>& func, int64_t millis) override
{
return new HTTPRPCTimer(base, func, millis);
}
private:
struct event_base* base;
};
/* Pre-base64-encoded authentication token */
static std::string strRPCUserColonPass;
/* Stored RPC timer interface (for unregistration) */
static std::unique_ptr<HTTPRPCTimerInterface> httpRPCTimerInterface;
static void JSONErrorReply(HTTPRequest* req, const UniValue& objError, const UniValue& id)
{
// Send error reply from json-rpc error object
int nStatus = HTTP_INTERNAL_SERVER_ERROR;
int code = find_value(objError, "code").get_int();
if (code == RPC_INVALID_REQUEST)
nStatus = HTTP_BAD_REQUEST;
else if (code == RPC_METHOD_NOT_FOUND)
nStatus = HTTP_NOT_FOUND;
std::string strReply = JSONRPCReply(NullUniValue, objError, id);
req->WriteHeader("Content-Type", "application/json");
req->WriteReply(nStatus, strReply);
}
//This function checks username and password against -rpcauth
//entries from config file.
static bool multiUserAuthorized(std::string strUserPass)
{
if (strUserPass.find(':') == std::string::npos) {
return false;
}
std::string strUser = strUserPass.substr(0, strUserPass.find(':'));
std::string strPass = strUserPass.substr(strUserPass.find(':') + 1);
for (const std::string& strRPCAuth : gArgs.GetArgs("-rpcauth")) {
//Search for multi-user login/pass "rpcauth" from config
std::vector<std::string> vFields;
boost::split(vFields, strRPCAuth, boost::is_any_of(":$"));
if (vFields.size() != 3) {
//Incorrect formatting in config file
continue;
}
std::string strName = vFields[0];
if (!TimingResistantEqual(strName, strUser)) {
continue;
}
std::string strSalt = vFields[1];
std::string strHash = vFields[2];
static const unsigned int KEY_SIZE = 32;
unsigned char out[KEY_SIZE];
CHMAC_SHA256(reinterpret_cast<const unsigned char*>(strSalt.c_str()), strSalt.size()).Write(reinterpret_cast<const unsigned char*>(strPass.c_str()), strPass.size()).Finalize(out);
std::vector<unsigned char> hexvec(out, out+KEY_SIZE);
std::string strHashFromPass = HexStr(hexvec);
if (TimingResistantEqual(strHashFromPass, strHash)) {
return true;
}
}
return false;
}
static bool RPCAuthorized(const std::string& strAuth, std::string& strAuthUsernameOut)
{
if (strRPCUserColonPass.empty()) // Belt-and-suspenders measure if InitRPCAuthentication was not called
return false;
if (strAuth.substr(0, 6) != "Basic ")
return false;
std::string strUserPass64 = strAuth.substr(6);
boost::trim(strUserPass64);
std::string strUserPass = DecodeBase64(strUserPass64);
if (strUserPass.find(':') != std::string::npos)
strAuthUsernameOut = strUserPass.substr(0, strUserPass.find(':'));
//Check if authorized under single-user field
if (TimingResistantEqual(strUserPass, strRPCUserColonPass)) {
return true;
}
return multiUserAuthorized(strUserPass);
}
static bool HTTPReq_JSONRPC(HTTPRequest* req, const std::string &)
{
// JSONRPC handles only POST
if (req->GetRequestMethod() != HTTPRequest::POST) {
req->WriteReply(HTTP_BAD_METHOD, "JSONRPC server handles only POST requests");
return false;
}
// Check authorization
std::pair<bool, std::string> authHeader = req->GetHeader("authorization");
if (!authHeader.first) {
req->WriteHeader("WWW-Authenticate", WWW_AUTH_HEADER_DATA);
req->WriteReply(HTTP_UNAUTHORIZED);
return false;
}
JSONRPCRequest jreq;
if (!RPCAuthorized(authHeader.second, jreq.authUser)) {
LogPrintf("ThreadRPCServer incorrect password attempt from %s\n", req->GetPeer().ToString());
/* Deter brute-forcing
If this results in a DoS the user really
shouldn't have their RPC port exposed. */
MilliSleep(250);
req->WriteHeader("WWW-Authenticate", WWW_AUTH_HEADER_DATA);
req->WriteReply(HTTP_UNAUTHORIZED);
return false;
}
try {
// Parse request
UniValue valRequest;
if (!valRequest.read(req->ReadBody()))
throw JSONRPCError(RPC_PARSE_ERROR, "Parse error");
// Set the URI
jreq.URI = req->GetURI();
std::string strReply;
// singleton request
if (valRequest.isObject()) {
jreq.parse(valRequest);
UniValue result = tableRPC.execute(jreq);
// Send reply
strReply = JSONRPCReply(result, NullUniValue, jreq.id);
// array of requests
} else if (valRequest.isArray())
strReply = JSONRPCExecBatch(jreq, valRequest.get_array());
else
throw JSONRPCError(RPC_PARSE_ERROR, "Top-level object parse error");
req->WriteHeader("Content-Type", "application/json");
req->WriteReply(HTTP_OK, strReply);
} catch (const UniValue& objError) {
JSONErrorReply(req, objError, jreq.id);
return false;
} catch (const std::exception& e) {
JSONErrorReply(req, JSONRPCError(RPC_PARSE_ERROR, e.what()), jreq.id);
return false;
}
return true;
}
static bool InitRPCAuthentication()
{
if (gArgs.GetArg("-rpcpassword", "") == "")
{
LogPrintf("No rpcpassword set - using random cookie authentication\n");
if (!GenerateAuthCookie(&strRPCUserColonPass)) {
uiInterface.ThreadSafeMessageBox(
_("Error: A fatal internal error occurred, see debug.log for details"), // Same message as AbortNode
"", CClientUIInterface::MSG_ERROR);
return false;
}
} else {
LogPrintf("Config options rpcuser and rpcpassword will soon be deprecated. Locally-run instances may remove rpcuser to use cookie-based auth, or may be replaced with rpcauth. Please see share/rpcuser for rpcauth auth generation.\n");
strRPCUserColonPass = gArgs.GetArg("-rpcuser", "") + ":" + gArgs.GetArg("-rpcpassword", "");
}
return true;
}
bool StartHTTPRPC()
{
LogPrint(BCLog::RPC, "Starting HTTP RPC server\n");
if (!InitRPCAuthentication())
return false;
RegisterHTTPHandler("/", true, HTTPReq_JSONRPC);
#ifdef ENABLE_WALLET
// ifdef can be removed once we switch to better endpoint support and API versioning
RegisterHTTPHandler("/wallet/", false, HTTPReq_JSONRPC);
#endif
assert(EventBase());
httpRPCTimerInterface = MakeUnique<HTTPRPCTimerInterface>(EventBase());
RPCSetTimerInterface(httpRPCTimerInterface.get());
return true;
}
void InterruptHTTPRPC()
{
LogPrint(BCLog::RPC, "Interrupting HTTP RPC server\n");
}
void StopHTTPRPC()
{
LogPrint(BCLog::RPC, "Stopping HTTP RPC server\n");
UnregisterHTTPHandler("/", true);
if (httpRPCTimerInterface) {
RPCUnsetTimerInterface(httpRPCTimerInterface.get());
httpRPCTimerInterface.reset();
}
}