Added additional config option for multiple RPC users.

src/httprpc.cpp

@@ -10,8 +10,12 @@
 #include "util.h"
 #include "utilstrencodings.h"
 #include "ui_interface.h"
+#include "crypto/hmac_sha256.h"
+#include <stdio.h>
+#include "utilstrencodings.h"
 
 #include <boost/algorithm/string.hpp> // boost::trim
+#include <boost/foreach.hpp> //BOOST_FOREACH
 
 /** Simple one-shot callback timer to be used by the RPC mechanism to e.g.
  * re-lock the wellet.
@@ -72,6 +76,50 @@ static void JSONErrorReply(HTTPRequest* req, const UniValue& objError, const Uni
     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);
+
+    if (mapMultiArgs.count("-rpcauth") > 0) {
+        //Search for multi-user login/pass "rpcauth" from config
+        BOOST_FOREACH(std::string strRPCAuth, mapMultiArgs["-rpcauth"])
+        {
+            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];
+
+            unsigned int KEY_SIZE = 32;
+            unsigned char *out = new unsigned char[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)
 {
     if (strRPCUserColonPass.empty()) // Belt-and-suspenders measure if InitRPCAuthentication was not called
@@ -81,7 +129,12 @@ static bool RPCAuthorized(const std::string& strAuth)
     std::string strUserPass64 = strAuth.substr(6);
     boost::trim(strUserPass64);
     std::string strUserPass = DecodeBase64(strUserPass64);
-    return TimingResistantEqual(strUserPass, strRPCUserColonPass);
+    
+    //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 &)
@@ -157,6 +210,7 @@ static bool InitRPCAuthentication()
             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.");
         strRPCUserColonPass = mapArgs["-rpcuser"] + ":" + mapArgs["-rpcpassword"];
     }
     return true;