Fix #748 - Check hash of sig instead of message contents

src/class_objectProcessor.py

@@ -427,6 +427,7 @@ class objectProcessor(threading.Thread):
         logger.debug('As a matter of intellectual curiosity, here is the Bitcoin address associated with the keys owned by the other person: %s  ..and here is the testnet address: %s. The other person must take their private signing key from Bitmessage and import it into Bitcoin (or a service like Blockchain.info) for it to be of any use. Do not use this unless you know what you are doing.' %
                      (helper_bitcoin.calculateBitcoinAddressFromPubkey(pubSigningKey), helper_bitcoin.calculateTestnetAddressFromPubkey(pubSigningKey))
                      )
+        sigHash = hashlib.sha512(hashlib.sha512(signature).digest()).digest()[32:] # Used to detect and ignore duplicate messages in our inbox
 
         # calculate the fromRipe.
         sha = hashlib.new('sha512')
@@ -503,13 +504,13 @@ class objectProcessor(threading.Thread):
             body = 'Unknown encoding type.\n\n' + repr(message)
             subject = ''
         # Let us make sure that we haven't already received this message
-        if helper_inbox.isMessageAlreadyInInbox(toAddress, fromAddress, subject, body, messageEncodingType):
+        if helper_inbox.isMessageAlreadyInInbox(sigHash):
             logger.info('This msg is already in our inbox. Ignoring it.')
             blockMessage = True
         if not blockMessage:
             if messageEncodingType != 0:
                 t = (inventoryHash, toAddress, fromAddress, subject, int(
-                    time.time()), body, 'inbox', messageEncodingType, 0)
+                    time.time()), body, 'inbox', messageEncodingType, 0, sigHash)
                 helper_inbox.insert(t)
 
                 shared.UISignalQueue.put(('displayNewInboxMessage', (
@@ -701,6 +702,7 @@ class objectProcessor(threading.Thread):
             logger.debug('ECDSA verify failed')
             return
         logger.debug('ECDSA verify passed')
+        sigHash = hashlib.sha512(hashlib.sha512(signature).digest()).digest()[32:] # Used to detect and ignore duplicate messages in our inbox
 
         fromAddress = encodeAddress(
             sendersAddressVersion, sendersStream, calculatedRipe)
@@ -735,17 +737,17 @@ class objectProcessor(threading.Thread):
             subject = ''
         elif messageEncodingType == 0:
             logger.info('messageEncodingType == 0. Doing nothing with the message.')
+            return
         else:
             body = 'Unknown encoding type.\n\n' + repr(message)
             subject = ''
 
         toAddress = '[Broadcast subscribers]'
-        if messageEncodingType != 0:
+        if helper_inbox.isMessageAlreadyInInbox(sigHash):
-            if helper_inbox.isMessageAlreadyInInbox(toAddress, fromAddress, subject, body, messageEncodingType):
             logger.info('This broadcast is already in our inbox. Ignoring it.')
-            else:
+            return
         t = (inventoryHash, toAddress, fromAddress, subject, int(
-                    time.time()), body, 'inbox', messageEncodingType, 0)
+            time.time()), body, 'inbox', messageEncodingType, 0, sigHash)
         helper_inbox.insert(t)
 
         shared.UISignalQueue.put(('displayNewInboxMessage', (

src/class_singleWorker.py

@@ -821,8 +821,9 @@ class singleWorker(threading.Thread):
             # If we are sending to ourselves or a chan, let's put the message in
             # our own inbox.
             if shared.config.has_section(toaddress):
+                sigHash = hashlib.sha512(hashlib.sha512(signature).digest()).digest()[32:] # Used to detect and ignore duplicate messages in our inbox
                 t = (inventoryHash, toaddress, fromaddress, subject, int(
-                    time.time()), message, 'inbox', 2, 0)
+                    time.time()), message, 'inbox', 2, 0, sigHash)
                 helper_inbox.insert(t)
 
                 shared.UISignalQueue.put(('displayNewInboxMessage', (

src/class_sqlThread.py

@@ -28,7 +28,7 @@ class sqlThread(threading.Thread):
 
         try:
             self.cur.execute(
-                '''CREATE TABLE inbox (msgid blob, toaddress text, fromaddress text, subject text, received text, message text, folder text, encodingtype int, read bool, UNIQUE(msgid) ON CONFLICT REPLACE)''' )
+                '''CREATE TABLE inbox (msgid blob, toaddress text, fromaddress text, subject text, received text, message text, folder text, encodingtype int, read bool, sighash blob, UNIQUE(msgid) ON CONFLICT REPLACE)''' )
             self.cur.execute(
                 '''CREATE TABLE sent (msgid blob, toaddress text, toripe blob, fromaddress text, subject text, message text, ackdata blob, lastactiontime integer, status text, pubkeyretrynumber integer, msgretrynumber integer, folder text, encodingtype int)''' )
             self.cur.execute(
@@ -61,7 +61,7 @@ class sqlThread(threading.Thread):
                 '''INSERT INTO subscriptions VALUES('Bitmessage new releases/announcements','BM-GtovgYdgs7qXPkoYaRgrLFuFKz1SFpsw',1)''')
             self.cur.execute(
                 '''CREATE TABLE settings (key blob, value blob, UNIQUE(key) ON CONFLICT REPLACE)''' )
-            self.cur.execute( '''INSERT INTO settings VALUES('version','8')''')
+            self.cur.execute( '''INSERT INTO settings VALUES('version','9')''')
             self.cur.execute( '''INSERT INTO settings VALUES('lastvacuumtime',?)''', (
                 int(time.time()),))
             self.cur.execute(
@@ -361,6 +361,20 @@ class sqlThread(threading.Thread):
             self.cur.execute(query, parameters)
             logger.debug('Finished clearing currently held pubkeys.')
 
+        # Add a new column to the inbox table to store the hash of the message signature.
+        # We'll use this as temporary message UUID in order to detect duplicates. 
+        item = '''SELECT value FROM settings WHERE key='version';'''
+        parameters = ''
+        self.cur.execute(item, parameters)
+        currentVersion = int(self.cur.fetchall()[0][0])
+        if currentVersion == 8:
+            logger.debug('In messages.dat database, adding sighash field to the inbox table.')
+            item = '''ALTER TABLE inbox ADD sighash blob DEFAULT '' '''
+            parameters = ''
+            self.cur.execute(item, parameters)
+            item = '''update settings set value=? WHERE key='version';'''
+            parameters = (9,)
+            self.cur.execute(item, parameters)
 
         # Are you hoping to add a new option to the keys.dat file of existing
         # Bitmessage users or modify the SQLite database? Add it right above this line!

src/helper_inbox.py

@@ -2,14 +2,14 @@ from helper_sql import *
 import shared
 
 def insert(t):
-    sqlExecute('''INSERT INTO inbox VALUES (?,?,?,?,?,?,?,?,?)''', *t)
+    sqlExecute('''INSERT INTO inbox VALUES (?,?,?,?,?,?,?,?,?,?)''', *t)
     shared.UISignalQueue.put(('changedInboxUnread', None))
     
 def trash(msgid):
     sqlExecute('''UPDATE inbox SET folder='trash' WHERE msgid=?''', msgid)
     shared.UISignalQueue.put(('removeInboxRowByMsgid',msgid))
     
-def isMessageAlreadyInInbox(toAddress, fromAddress, subject, body, encodingType):
+def isMessageAlreadyInInbox(sigHash):
     queryReturn = sqlQuery(
-        '''SELECT COUNT(*) FROM inbox WHERE toaddress=? AND fromaddress=? AND subject=? AND message=? AND encodingtype=? ''', toAddress, fromAddress, subject, body, encodingType)
+        '''SELECT COUNT(*) FROM inbox WHERE sighash=?''', sigHash)
     return queryReturn[0][0] != 0