diff --git a/bitcoin-qt.pro b/bitcoin-qt.pro index c8f46538..0711ae1c 100644 --- a/bitcoin-qt.pro +++ b/bitcoin-qt.pro @@ -119,6 +119,7 @@ HEADERS += src/qt/bitcoingui.h \ src/qt/aboutdialog.h \ src/qt/editaddressdialog.h \ src/qt/bitcoinaddressvalidator.h \ + src/alert.h \ src/addrman.h \ src/base58.h \ src/bignum.h \ @@ -188,6 +189,7 @@ SOURCES += src/qt/bitcoin.cpp src/qt/bitcoingui.cpp \ src/qt/aboutdialog.cpp \ src/qt/editaddressdialog.cpp \ src/qt/bitcoinaddressvalidator.cpp \ + src/alert.cpp \ src/version.cpp \ src/sync.cpp \ src/util.cpp \ diff --git a/src/alert.cpp b/src/alert.cpp new file mode 100644 index 00000000..6db9bf75 --- /dev/null +++ b/src/alert.cpp @@ -0,0 +1,236 @@ +// +// Alert system +// + +#include +#include + +#include "alert.h" +#include "key.h" +#include "net.h" +#include "sync.h" +#include "ui_interface.h" + +using namespace std; + +map mapAlerts; +CCriticalSection cs_mapAlerts; + +void CUnsignedAlert::SetNull() +{ + nVersion = 1; + nRelayUntil = 0; + nExpiration = 0; + nID = 0; + nCancel = 0; + setCancel.clear(); + nMinVer = 0; + nMaxVer = 0; + setSubVer.clear(); + nPriority = 0; + + strComment.clear(); + strStatusBar.clear(); + strReserved.clear(); +} + +std::string CUnsignedAlert::ToString() const +{ + std::string strSetCancel; + BOOST_FOREACH(int n, setCancel) + strSetCancel += strprintf("%d ", n); + std::string strSetSubVer; + BOOST_FOREACH(std::string str, setSubVer) + strSetSubVer += "\"" + str + "\" "; + return strprintf( + "CAlert(\n" + " nVersion = %d\n" + " nRelayUntil = %"PRI64d"\n" + " nExpiration = %"PRI64d"\n" + " nID = %d\n" + " nCancel = %d\n" + " setCancel = %s\n" + " nMinVer = %d\n" + " nMaxVer = %d\n" + " setSubVer = %s\n" + " nPriority = %d\n" + " strComment = \"%s\"\n" + " strStatusBar = \"%s\"\n" + ")\n", + nVersion, + nRelayUntil, + nExpiration, + nID, + nCancel, + strSetCancel.c_str(), + nMinVer, + nMaxVer, + strSetSubVer.c_str(), + nPriority, + strComment.c_str(), + strStatusBar.c_str()); +} + +void CUnsignedAlert::print() const +{ + printf("%s", ToString().c_str()); +} + +void CAlert::SetNull() +{ + CUnsignedAlert::SetNull(); + vchMsg.clear(); + vchSig.clear(); +} + +bool CAlert::IsNull() const +{ + return (nExpiration == 0); +} + +uint256 CAlert::GetHash() const +{ + return Hash(this->vchMsg.begin(), this->vchMsg.end()); +} + +bool CAlert::IsInEffect() const +{ + return (GetAdjustedTime() < nExpiration); +} + +bool CAlert::Cancels(const CAlert& alert) const +{ + if (!IsInEffect()) + return false; // this was a no-op before 31403 + return (alert.nID <= nCancel || setCancel.count(alert.nID)); +} + +bool CAlert::AppliesTo(int nVersion, std::string strSubVerIn) const +{ + // TODO: rework for client-version-embedded-in-strSubVer ? + return (IsInEffect() && + nMinVer <= nVersion && nVersion <= nMaxVer && + (setSubVer.empty() || setSubVer.count(strSubVerIn))); +} + +bool CAlert::AppliesToMe() const +{ + return AppliesTo(PROTOCOL_VERSION, FormatSubVersion(CLIENT_NAME, CLIENT_VERSION, std::vector())); +} + +bool CAlert::RelayTo(CNode* pnode) const +{ + if (!IsInEffect()) + return false; + // returns true if wasn't already contained in the set + if (pnode->setKnown.insert(GetHash()).second) + { + if (AppliesTo(pnode->nVersion, pnode->strSubVer) || + AppliesToMe() || + GetAdjustedTime() < nRelayUntil) + { + pnode->PushMessage("alert", *this); + return true; + } + } + return false; +} + +bool CAlert::CheckSignature() const +{ + CKey key; + if (!key.SetPubKey(ParseHex("04fc9702847840aaf195de8442ebecedf5b095cdbb9bc716bda9110971b28a49e0ead8564ff0db22209e0374782c093bb899692d524e9d6a6956e7c5ecbcd68284"))) + return error("CAlert::CheckSignature() : SetPubKey failed"); + if (!key.Verify(Hash(vchMsg.begin(), vchMsg.end()), vchSig)) + return error("CAlert::CheckSignature() : verify signature failed"); + + // Now unserialize the data + CDataStream sMsg(vchMsg, SER_NETWORK, PROTOCOL_VERSION); + sMsg >> *(CUnsignedAlert*)this; + return true; +} + +CAlert CAlert::getAlertByHash(const uint256 &hash) +{ + CAlert retval; + { + LOCK(cs_mapAlerts); + map::iterator mi = mapAlerts.find(hash); + if(mi != mapAlerts.end()) + retval = mi->second; + } + return retval; +} + +bool CAlert::ProcessAlert() +{ + if (!CheckSignature()) + return false; + if (!IsInEffect()) + return false; + + // alert.nID=max is reserved for if the alert key is + // compromised. It must have a pre-defined message, + // must never expire, must apply to all versions, + // and must cancel all previous + // alerts or it will be ignored (so an attacker can't + // send an "everything is OK, don't panic" version that + // cannot be overridden): + int maxInt = std::numeric_limits::max(); + if (nID == maxInt) + { + if (!( + nExpiration == maxInt && + nCancel == (maxInt-1) && + nMinVer == 0 && + nMaxVer == maxInt && + setSubVer.empty() && + nPriority == maxInt && + strStatusBar == "URGENT: Alert key compromised, upgrade required" + )) + return false; + } + + { + LOCK(cs_mapAlerts); + // Cancel previous alerts + for (map::iterator mi = mapAlerts.begin(); mi != mapAlerts.end();) + { + const CAlert& alert = (*mi).second; + if (Cancels(alert)) + { + printf("cancelling alert %d\n", alert.nID); + uiInterface.NotifyAlertChanged((*mi).first, CT_DELETED); + mapAlerts.erase(mi++); + } + else if (!alert.IsInEffect()) + { + printf("expiring alert %d\n", alert.nID); + uiInterface.NotifyAlertChanged((*mi).first, CT_DELETED); + mapAlerts.erase(mi++); + } + else + mi++; + } + + // Check if this alert has been cancelled + BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts) + { + const CAlert& alert = item.second; + if (alert.Cancels(*this)) + { + printf("alert already cancelled by %d\n", alert.nID); + return false; + } + } + + // Add to mapAlerts + mapAlerts.insert(make_pair(GetHash(), *this)); + // Notify UI if it applies to me + if(AppliesToMe()) + uiInterface.NotifyAlertChanged(GetHash(), CT_NEW); + } + + printf("accepted alert %d, AppliesToMe()=%d\n", nID, AppliesToMe()); + return true; +} diff --git a/src/alert.h b/src/alert.h new file mode 100644 index 00000000..7949c769 --- /dev/null +++ b/src/alert.h @@ -0,0 +1,102 @@ +// Copyright (c) 2010 Satoshi Nakamoto +// Copyright (c) 2009-2012 The Bitcoin developers +// Distributed under the MIT/X11 software license, see the accompanying +// file COPYING or http://www.opensource.org/licenses/mit-license.php. + +#ifndef _BITCOINALERT_H_ +#define _BITCOINALERT_H_ 1 + +#include +#include + +#include "uint256.h" +#include "util.h" + +class CNode; + +/** Alerts are for notifying old versions if they become too obsolete and + * need to upgrade. The message is displayed in the status bar. + * Alert messages are broadcast as a vector of signed data. Unserializing may + * not read the entire buffer if the alert is for a newer version, but older + * versions can still relay the original data. + */ +class CUnsignedAlert +{ +public: + int nVersion; + int64 nRelayUntil; // when newer nodes stop relaying to newer nodes + int64 nExpiration; + int nID; + int nCancel; + std::set setCancel; + int nMinVer; // lowest version inclusive + int nMaxVer; // highest version inclusive + std::set setSubVer; // empty matches all + int nPriority; + + // Actions + std::string strComment; + std::string strStatusBar; + std::string strReserved; + + IMPLEMENT_SERIALIZE + ( + READWRITE(this->nVersion); + nVersion = this->nVersion; + READWRITE(nRelayUntil); + READWRITE(nExpiration); + READWRITE(nID); + READWRITE(nCancel); + READWRITE(setCancel); + READWRITE(nMinVer); + READWRITE(nMaxVer); + READWRITE(setSubVer); + READWRITE(nPriority); + + READWRITE(strComment); + READWRITE(strStatusBar); + READWRITE(strReserved); + ) + + void SetNull(); + + std::string ToString() const; + void print() const; +}; + +/** An alert is a combination of a serialized CUnsignedAlert and a signature. */ +class CAlert : public CUnsignedAlert +{ +public: + std::vector vchMsg; + std::vector vchSig; + + CAlert() + { + SetNull(); + } + + IMPLEMENT_SERIALIZE + ( + READWRITE(vchMsg); + READWRITE(vchSig); + ) + + void SetNull(); + bool IsNull() const; + uint256 GetHash() const; + bool IsInEffect() const; + bool Cancels(const CAlert& alert) const; + bool AppliesTo(int nVersion, std::string strSubVerIn) const; + bool AppliesToMe() const; + bool RelayTo(CNode* pnode) const; + bool CheckSignature() const; + bool ProcessAlert(); + + /* + * Get copy of (active) alert object by hash. Returns a null alert if it is not found. + */ + static CAlert getAlertByHash(const uint256 &hash); +}; + +#endif diff --git a/src/main.cpp b/src/main.cpp index 71d425e1..010db0c1 100644 --- a/src/main.cpp +++ b/src/main.cpp @@ -3,6 +3,7 @@ // Distributed under the MIT/X11 software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. +#include "alert.h" #include "checkpoints.h" #include "db.h" #include "net.h" @@ -2256,8 +2257,8 @@ bool LoadExternalBlockFile(FILE* fileIn) // CAlert // -map mapAlerts; -CCriticalSection cs_mapAlerts; +extern map mapAlerts; +extern CCriticalSection cs_mapAlerts; string GetWarnings(string strFor) { @@ -2303,91 +2304,6 @@ string GetWarnings(string strFor) return "error"; } -CAlert CAlert::getAlertByHash(const uint256 &hash) -{ - CAlert retval; - { - LOCK(cs_mapAlerts); - map::iterator mi = mapAlerts.find(hash); - if(mi != mapAlerts.end()) - retval = mi->second; - } - return retval; -} - -bool CAlert::ProcessAlert() -{ - if (!CheckSignature()) - return false; - if (!IsInEffect()) - return false; - - // alert.nID=max is reserved for if the alert key is - // compromised. It must have a pre-defined message, - // must never expire, must apply to all versions, - // and must cancel all previous - // alerts or it will be ignored (so an attacker can't - // send an "everything is OK, don't panic" version that - // cannot be overridden): - int maxInt = std::numeric_limits::max(); - if (nID == maxInt) - { - if (!( - nExpiration == maxInt && - nCancel == (maxInt-1) && - nMinVer == 0 && - nMaxVer == maxInt && - setSubVer.empty() && - nPriority == maxInt && - strStatusBar == "URGENT: Alert key compromised, upgrade required" - )) - return false; - } - - { - LOCK(cs_mapAlerts); - // Cancel previous alerts - for (map::iterator mi = mapAlerts.begin(); mi != mapAlerts.end();) - { - const CAlert& alert = (*mi).second; - if (Cancels(alert)) - { - printf("cancelling alert %d\n", alert.nID); - uiInterface.NotifyAlertChanged((*mi).first, CT_DELETED); - mapAlerts.erase(mi++); - } - else if (!alert.IsInEffect()) - { - printf("expiring alert %d\n", alert.nID); - uiInterface.NotifyAlertChanged((*mi).first, CT_DELETED); - mapAlerts.erase(mi++); - } - else - mi++; - } - - // Check if this alert has been cancelled - BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts) - { - const CAlert& alert = item.second; - if (alert.Cancels(*this)) - { - printf("alert already cancelled by %d\n", alert.nID); - return false; - } - } - - // Add to mapAlerts - mapAlerts.insert(make_pair(GetHash(), *this)); - // Notify UI if it applies to me - if(AppliesToMe()) - uiInterface.NotifyAlertChanged(GetHash(), CT_NEW); - } - - printf("accepted alert %d, AppliesToMe()=%d\n", nID, AppliesToMe()); - return true; -} - diff --git a/src/main.h b/src/main.h index dc9f9ee7..294024b4 100644 --- a/src/main.h +++ b/src/main.h @@ -1397,212 +1397,6 @@ public: - -/** Alerts are for notifying old versions if they become too obsolete and - * need to upgrade. The message is displayed in the status bar. - * Alert messages are broadcast as a vector of signed data. Unserializing may - * not read the entire buffer if the alert is for a newer version, but older - * versions can still relay the original data. - */ -class CUnsignedAlert -{ -public: - int nVersion; - int64 nRelayUntil; // when newer nodes stop relaying to newer nodes - int64 nExpiration; - int nID; - int nCancel; - std::set setCancel; - int nMinVer; // lowest version inclusive - int nMaxVer; // highest version inclusive - std::set setSubVer; // empty matches all - int nPriority; - - // Actions - std::string strComment; - std::string strStatusBar; - std::string strReserved; - - IMPLEMENT_SERIALIZE - ( - READWRITE(this->nVersion); - nVersion = this->nVersion; - READWRITE(nRelayUntil); - READWRITE(nExpiration); - READWRITE(nID); - READWRITE(nCancel); - READWRITE(setCancel); - READWRITE(nMinVer); - READWRITE(nMaxVer); - READWRITE(setSubVer); - READWRITE(nPriority); - - READWRITE(strComment); - READWRITE(strStatusBar); - READWRITE(strReserved); - ) - - void SetNull() - { - nVersion = 1; - nRelayUntil = 0; - nExpiration = 0; - nID = 0; - nCancel = 0; - setCancel.clear(); - nMinVer = 0; - nMaxVer = 0; - setSubVer.clear(); - nPriority = 0; - - strComment.clear(); - strStatusBar.clear(); - strReserved.clear(); - } - - std::string ToString() const - { - std::string strSetCancel; - BOOST_FOREACH(int n, setCancel) - strSetCancel += strprintf("%d ", n); - std::string strSetSubVer; - BOOST_FOREACH(std::string str, setSubVer) - strSetSubVer += "\"" + str + "\" "; - return strprintf( - "CAlert(\n" - " nVersion = %d\n" - " nRelayUntil = %"PRI64d"\n" - " nExpiration = %"PRI64d"\n" - " nID = %d\n" - " nCancel = %d\n" - " setCancel = %s\n" - " nMinVer = %d\n" - " nMaxVer = %d\n" - " setSubVer = %s\n" - " nPriority = %d\n" - " strComment = \"%s\"\n" - " strStatusBar = \"%s\"\n" - ")\n", - nVersion, - nRelayUntil, - nExpiration, - nID, - nCancel, - strSetCancel.c_str(), - nMinVer, - nMaxVer, - strSetSubVer.c_str(), - nPriority, - strComment.c_str(), - strStatusBar.c_str()); - } - - void print() const - { - printf("%s", ToString().c_str()); - } -}; - -/** An alert is a combination of a serialized CUnsignedAlert and a signature. */ -class CAlert : public CUnsignedAlert -{ -public: - std::vector vchMsg; - std::vector vchSig; - - CAlert() - { - SetNull(); - } - - IMPLEMENT_SERIALIZE - ( - READWRITE(vchMsg); - READWRITE(vchSig); - ) - - void SetNull() - { - CUnsignedAlert::SetNull(); - vchMsg.clear(); - vchSig.clear(); - } - - bool IsNull() const - { - return (nExpiration == 0); - } - - uint256 GetHash() const - { - return Hash(this->vchMsg.begin(), this->vchMsg.end()); - } - - bool IsInEffect() const - { - return (GetAdjustedTime() < nExpiration); - } - - bool Cancels(const CAlert& alert) const - { - if (!IsInEffect()) - return false; // this was a no-op before 31403 - return (alert.nID <= nCancel || setCancel.count(alert.nID)); - } - - bool AppliesTo(int nVersion, std::string strSubVerIn) const - { - // TODO: rework for client-version-embedded-in-strSubVer ? - return (IsInEffect() && - nMinVer <= nVersion && nVersion <= nMaxVer && - (setSubVer.empty() || setSubVer.count(strSubVerIn))); - } - - bool AppliesToMe() const - { - return AppliesTo(PROTOCOL_VERSION, FormatSubVersion(CLIENT_NAME, CLIENT_VERSION, std::vector())); - } - - bool RelayTo(CNode* pnode) const - { - if (!IsInEffect()) - return false; - // returns true if wasn't already contained in the set - if (pnode->setKnown.insert(GetHash()).second) - { - if (AppliesTo(pnode->nVersion, pnode->strSubVer) || - AppliesToMe() || - GetAdjustedTime() < nRelayUntil) - { - pnode->PushMessage("alert", *this); - return true; - } - } - return false; - } - - bool CheckSignature() - { - CKey key; - if (!key.SetPubKey(ParseHex("04fc9702847840aaf195de8442ebecedf5b095cdbb9bc716bda9110971b28a49e0ead8564ff0db22209e0374782c093bb899692d524e9d6a6956e7c5ecbcd68284"))) - return error("CAlert::CheckSignature() : SetPubKey failed"); - if (!key.Verify(Hash(vchMsg.begin(), vchMsg.end()), vchSig)) - return error("CAlert::CheckSignature() : verify signature failed"); - - // Now unserialize the data - CDataStream sMsg(vchMsg, SER_NETWORK, PROTOCOL_VERSION); - sMsg >> *(CUnsignedAlert*)this; - return true; - } - - bool ProcessAlert(); - - /* - * Get copy of (active) alert object by hash. Returns a null alert if it is not found. - */ - static CAlert getAlertByHash(const uint256 &hash); -}; - class CTxMemPool { public: diff --git a/src/makefile.linux-mingw b/src/makefile.linux-mingw index 625ed678..c46c876d 100644 --- a/src/makefile.linux-mingw +++ b/src/makefile.linux-mingw @@ -55,6 +55,7 @@ LIBS += -l mingwthrd -l kernel32 -l user32 -l gdi32 -l comdlg32 -l winspool -l w HEADERS = $(wildcard *.h) OBJS= \ + obj/alert.o \ obj/version.o \ obj/checkpoints.o \ obj/netbase.o \ diff --git a/src/makefile.mingw b/src/makefile.mingw index 9b3d36f3..5dadda82 100644 --- a/src/makefile.mingw +++ b/src/makefile.mingw @@ -51,6 +51,7 @@ LIBS += -l kernel32 -l user32 -l gdi32 -l comdlg32 -l winspool -l winmm -l shell HEADERS = $(wildcard *.h) OBJS= \ + obj/alert.o \ obj/version.o \ obj/checkpoints.o \ obj/netbase.o \ diff --git a/src/makefile.osx b/src/makefile.osx index de829b9e..2666caa9 100644 --- a/src/makefile.osx +++ b/src/makefile.osx @@ -70,6 +70,7 @@ CFLAGS += -Wall -Wextra -Wformat -Wformat-security -Wno-unused-parameter \ $(DEBUGFLAGS) $(DEFS) $(INCLUDEPATHS) OBJS= \ + obj/alert.o \ obj/version.o \ obj/checkpoints.o \ obj/netbase.o \ diff --git a/src/makefile.unix b/src/makefile.unix index ac42743d..37a19179 100644 --- a/src/makefile.unix +++ b/src/makefile.unix @@ -101,6 +101,7 @@ xCXXFLAGS=-O2 -pthread -Wall -Wextra -Wformat -Wformat-security -Wno-unused-para xLDFLAGS=$(LDHARDENING) $(LDFLAGS) OBJS= \ + obj/alert.o \ obj/version.o \ obj/checkpoints.o \ obj/netbase.o \ diff --git a/src/qt/clientmodel.cpp b/src/qt/clientmodel.cpp index 43bce6f2..b820d16a 100644 --- a/src/qt/clientmodel.cpp +++ b/src/qt/clientmodel.cpp @@ -4,6 +4,7 @@ #include "addresstablemodel.h" #include "transactiontablemodel.h" +#include "alert.h" #include "main.h" #include "ui_interface.h"