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src/alert.cpp

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+//
+// Alert system
+//
+
+#include <algorithm>
+#include <boost/algorithm/string/classification.hpp>
+#include <boost/algorithm/string/replace.hpp>
+#include <boost/foreach.hpp>
+#include <map>
+
+#include "alert.h"
+#include "key.h"
+#include "net.h"
+#include "sync.h"
+#include "ui_interface.h"
+
+using namespace std;
+
+map<uint256, CAlert> mapAlerts;
+CCriticalSection cs_mapAlerts;
+
+static const char* pszMainKey = "0418d82f8b4b03e2a595cc8760b54e78be13dd02ace3d66bb8ed995df18e345f3dabd0befb758cd89a54139f068b9821916183db9cba1b2b4d005708a2fa60dab5";
+
+// TestNet alerts pubKey
+static const char* pszTestKey = "04234c1964be26b751050675ac1e5804c77fd889cd0c631b4f7374f1b8679dc4091b0f35385e5c6686b9e2af855c6ddfc6d93fcfd5b73e636196409bb7c11de390";
+
+// TestNet alerts private key
+// "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"
+
+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  = %"PRId64"\n"
+        "    nExpiration  = %"PRId64"\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<std::string>()));
+}
+
+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(fTestNet ? pszTestKey : pszMainKey)))
+        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<uint256, CAlert>::iterator mi = mapAlerts.find(hash);
+        if(mi != mapAlerts.end())
+            retval = mi->second;
+    }
+    return retval;
+}
+
+bool CAlert::ProcessAlert(bool fThread)
+{
+    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<int>::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<uint256, CAlert>::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 and -alertnotify if it applies to me
+        if(AppliesToMe())
+        {
+            uiInterface.NotifyAlertChanged(GetHash(), CT_NEW);
+            std::string strCmd = GetArg("-alertnotify", "");
+            if (!strCmd.empty())
+            {
+                // Alert text should be plain ascii coming from a trusted source, but to
+                // be safe we first strip anything not in safeChars, then add single quotes around
+                // the whole string before passing it to the shell:
+                std::string singleQuote("'");
+                // safeChars chosen to allow simple messages/URLs/email addresses, but avoid anything
+                // even possibly remotely dangerous like & or >
+                std::string safeChars("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890 .,;_/:?@");
+                std::string safeStatus;
+                for (std::string::size_type i = 0; i < strStatusBar.size(); i++)
+                {
+                    if (safeChars.find(strStatusBar[i]) != std::string::npos)
+                        safeStatus.push_back(strStatusBar[i]);
+                }
+                safeStatus = singleQuote+safeStatus+singleQuote;
+                boost::replace_all(strCmd, "%s", safeStatus);
+
+                if (fThread)
+                    boost::thread t(runCommand, strCmd); // thread runs free
+                else
+                    runCommand(strCmd);
+            }
+        }
+    }
+
+    printf("accepted alert %d, AppliesToMe()=%d\n", nID, AppliesToMe());
+    return true;
+}

src/alert.h

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+// 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 <set>
+#include <string>
+
+#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_t nRelayUntil;      // when newer nodes stop relaying to newer nodes
+    int64_t nExpiration;
+    int nID;
+    int nCancel;
+    std::set<int> setCancel;
+    int nMinVer;            // lowest version inclusive
+    int nMaxVer;            // highest version inclusive
+    std::set<std::string> 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<unsigned char> vchMsg;
+    std::vector<unsigned char> 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(bool fThread = true);
+
+    /*
+     * Get copy of (active) alert object by hash. Returns a null alert if it is not found.
+     */
+    static CAlert getAlertByHash(const uint256 &hash);
+};
+
+#endif