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7c06fbd8f5
A WWW-Authenticate header must be present in the 401
response to make clients know that they can authenticate,
and how.
WWW-Authenticate: Basic realm="jsonrpc"
Fixes #7462.
257 lines
8.1 KiB
C++
257 lines
8.1 KiB
C++
// Copyright (c) 2015 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "httprpc.h"
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#include "base58.h"
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#include "chainparams.h"
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#include "httpserver.h"
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#include "rpc/protocol.h"
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#include "rpc/server.h"
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#include "random.h"
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#include "sync.h"
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#include "util.h"
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#include "utilstrencodings.h"
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#include "ui_interface.h"
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#include "crypto/hmac_sha256.h"
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#include <stdio.h>
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#include "utilstrencodings.h"
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#include <boost/algorithm/string.hpp> // boost::trim
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#include <boost/foreach.hpp> //BOOST_FOREACH
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/** WWW-Authenticate to present with 401 Unauthorized response */
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static const char* WWW_AUTH_HEADER_DATA = "Basic realm=\"jsonrpc\"";
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/** Simple one-shot callback timer to be used by the RPC mechanism to e.g.
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* re-lock the wellet.
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*/
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class HTTPRPCTimer : public RPCTimerBase
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{
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public:
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HTTPRPCTimer(struct event_base* eventBase, boost::function<void(void)>& func, int64_t millis) :
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ev(eventBase, false, func)
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{
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struct timeval tv;
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tv.tv_sec = millis/1000;
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tv.tv_usec = (millis%1000)*1000;
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ev.trigger(&tv);
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}
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private:
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HTTPEvent ev;
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};
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class HTTPRPCTimerInterface : public RPCTimerInterface
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{
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public:
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HTTPRPCTimerInterface(struct event_base* base) : base(base)
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{
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}
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const char* Name()
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{
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return "HTTP";
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}
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RPCTimerBase* NewTimer(boost::function<void(void)>& func, int64_t millis)
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{
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return new HTTPRPCTimer(base, func, millis);
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}
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private:
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struct event_base* base;
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};
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/* Pre-base64-encoded authentication token */
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static std::string strRPCUserColonPass;
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/* Stored RPC timer interface (for unregistration) */
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static HTTPRPCTimerInterface* httpRPCTimerInterface = 0;
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static void JSONErrorReply(HTTPRequest* req, const UniValue& objError, const UniValue& id)
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{
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// Send error reply from json-rpc error object
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int nStatus = HTTP_INTERNAL_SERVER_ERROR;
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int code = find_value(objError, "code").get_int();
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if (code == RPC_INVALID_REQUEST)
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nStatus = HTTP_BAD_REQUEST;
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else if (code == RPC_METHOD_NOT_FOUND)
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nStatus = HTTP_NOT_FOUND;
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std::string strReply = JSONRPCReply(NullUniValue, objError, id);
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req->WriteHeader("Content-Type", "application/json");
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req->WriteReply(nStatus, strReply);
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}
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//This function checks username and password against -rpcauth
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//entries from config file.
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static bool multiUserAuthorized(std::string strUserPass)
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{
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if (strUserPass.find(":") == std::string::npos) {
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return false;
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}
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std::string strUser = strUserPass.substr(0, strUserPass.find(":"));
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std::string strPass = strUserPass.substr(strUserPass.find(":") + 1);
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if (mapMultiArgs.count("-rpcauth") > 0) {
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//Search for multi-user login/pass "rpcauth" from config
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BOOST_FOREACH(std::string strRPCAuth, mapMultiArgs["-rpcauth"])
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{
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std::vector<std::string> vFields;
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boost::split(vFields, strRPCAuth, boost::is_any_of(":$"));
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if (vFields.size() != 3) {
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//Incorrect formatting in config file
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continue;
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}
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std::string strName = vFields[0];
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if (!TimingResistantEqual(strName, strUser)) {
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continue;
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}
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std::string strSalt = vFields[1];
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std::string strHash = vFields[2];
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unsigned int KEY_SIZE = 32;
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unsigned char *out = new unsigned char[KEY_SIZE];
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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);
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std::vector<unsigned char> hexvec(out, out+KEY_SIZE);
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std::string strHashFromPass = HexStr(hexvec);
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if (TimingResistantEqual(strHashFromPass, strHash)) {
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return true;
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}
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}
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}
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return false;
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}
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static bool RPCAuthorized(const std::string& strAuth)
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{
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if (strRPCUserColonPass.empty()) // Belt-and-suspenders measure if InitRPCAuthentication was not called
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return false;
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if (strAuth.substr(0, 6) != "Basic ")
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return false;
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std::string strUserPass64 = strAuth.substr(6);
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boost::trim(strUserPass64);
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std::string strUserPass = DecodeBase64(strUserPass64);
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//Check if authorized under single-user field
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if (TimingResistantEqual(strUserPass, strRPCUserColonPass)) {
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return true;
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}
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return multiUserAuthorized(strUserPass);
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}
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static bool HTTPReq_JSONRPC(HTTPRequest* req, const std::string &)
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{
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// JSONRPC handles only POST
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if (req->GetRequestMethod() != HTTPRequest::POST) {
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req->WriteReply(HTTP_BAD_METHOD, "JSONRPC server handles only POST requests");
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return false;
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}
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// Check authorization
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std::pair<bool, std::string> authHeader = req->GetHeader("authorization");
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if (!authHeader.first) {
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req->WriteHeader("WWW-Authenticate", WWW_AUTH_HEADER_DATA);
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req->WriteReply(HTTP_UNAUTHORIZED);
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return false;
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}
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if (!RPCAuthorized(authHeader.second)) {
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LogPrintf("ThreadRPCServer incorrect password attempt from %s\n", req->GetPeer().ToString());
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/* Deter brute-forcing
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If this results in a DoS the user really
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shouldn't have their RPC port exposed. */
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MilliSleep(250);
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req->WriteHeader("WWW-Authenticate", WWW_AUTH_HEADER_DATA);
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req->WriteReply(HTTP_UNAUTHORIZED);
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return false;
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}
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JSONRequest jreq;
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try {
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// Parse request
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UniValue valRequest;
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if (!valRequest.read(req->ReadBody()))
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throw JSONRPCError(RPC_PARSE_ERROR, "Parse error");
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std::string strReply;
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// singleton request
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if (valRequest.isObject()) {
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jreq.parse(valRequest);
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UniValue result = tableRPC.execute(jreq.strMethod, jreq.params);
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// Send reply
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strReply = JSONRPCReply(result, NullUniValue, jreq.id);
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// array of requests
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} else if (valRequest.isArray())
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strReply = JSONRPCExecBatch(valRequest.get_array());
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else
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throw JSONRPCError(RPC_PARSE_ERROR, "Top-level object parse error");
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req->WriteHeader("Content-Type", "application/json");
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req->WriteReply(HTTP_OK, strReply);
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} catch (const UniValue& objError) {
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JSONErrorReply(req, objError, jreq.id);
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return false;
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} catch (const std::exception& e) {
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JSONErrorReply(req, JSONRPCError(RPC_PARSE_ERROR, e.what()), jreq.id);
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return false;
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}
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return true;
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}
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static bool InitRPCAuthentication()
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{
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if (mapArgs["-rpcpassword"] == "")
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{
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LogPrintf("No rpcpassword set - using random cookie authentication\n");
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if (!GenerateAuthCookie(&strRPCUserColonPass)) {
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uiInterface.ThreadSafeMessageBox(
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_("Error: A fatal internal error occurred, see debug.log for details"), // Same message as AbortNode
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"", CClientUIInterface::MSG_ERROR);
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return false;
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}
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} else {
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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.");
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strRPCUserColonPass = mapArgs["-rpcuser"] + ":" + mapArgs["-rpcpassword"];
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}
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return true;
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}
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bool StartHTTPRPC()
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{
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LogPrint("rpc", "Starting HTTP RPC server\n");
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if (!InitRPCAuthentication())
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return false;
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RegisterHTTPHandler("/", true, HTTPReq_JSONRPC);
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assert(EventBase());
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httpRPCTimerInterface = new HTTPRPCTimerInterface(EventBase());
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RPCSetTimerInterface(httpRPCTimerInterface);
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return true;
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}
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void InterruptHTTPRPC()
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{
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LogPrint("rpc", "Interrupting HTTP RPC server\n");
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}
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void StopHTTPRPC()
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{
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LogPrint("rpc", "Stopping HTTP RPC server\n");
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UnregisterHTTPHandler("/", true);
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if (httpRPCTimerInterface) {
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RPCUnsetTimerInterface(httpRPCTimerInterface);
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delete httpRPCTimerInterface;
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httpRPCTimerInterface = 0;
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}
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}
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