test scripts
This commit is contained in:
554
util/test_block_validation.py
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554
util/test_block_validation.py
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#!/usr/bin/env python3
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"""
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DragonX Block Validation Test Suite
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Submits tampered blocks to a running DragonX node and verifies they are all
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rejected. Each test modifies a single field in a real block fetched from the
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chain tip, then submits via the submitblock RPC.
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Tests:
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1. Bad nBits (diff=1) - ContextualCheckBlockHeader / CheckProofOfWork
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2. Bad RandomX solution - CheckRandomXSolution
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3. Future timestamp - CheckBlockHeader time check
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4. Bad block version (version=0) - CheckBlockHeader version check
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5. Bad Merkle root - CheckBlock Merkle validation
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6. Bad hashPrevBlock - ContextualCheckBlockHeader / AcceptBlockHeader
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7. Inflated coinbase reward - ConnectBlock subsidy check
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8. Duplicate transaction - CheckBlock Merkle malleability (CVE-2012-2459)
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9. Timestamp too old (MTP) - ContextualCheckBlockHeader median time check
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Usage:
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python3 test_block_validation.py
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"""
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import json
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import struct
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import subprocess
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import sys
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import os
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import time
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import hashlib
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import copy
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CLI = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "src", "dragonx-cli")
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DEBUG_LOG = os.path.expanduser("~/.hush/DRAGONX/debug.log")
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# ---------- RPC helpers ----------
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def rpc(method, *args):
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cmd = [CLI, method] + [str(a) for a in args]
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try:
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result = subprocess.run(cmd, capture_output=True, text=True, check=True)
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return result.stdout.strip()
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except subprocess.CalledProcessError as e:
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if e.stdout and e.stdout.strip():
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return e.stdout.strip()
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if e.stderr and e.stderr.strip():
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return e.stderr.strip()
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raise
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def rpc_json(method, *args):
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raw = rpc(method, *args)
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return json.loads(raw)
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# ---------- Serialization helpers ----------
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def read_int32(data, offset):
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return struct.unpack_from('<i', data, offset)[0], offset + 4
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def read_uint32(data, offset):
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return struct.unpack_from('<I', data, offset)[0], offset + 4
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def read_int64(data, offset):
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return struct.unpack_from('<q', data, offset)[0], offset + 8
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def read_uint256(data, offset):
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return data[offset:offset+32], offset + 32
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def read_compactsize(data, offset):
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val = data[offset]
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if val < 253:
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return val, offset + 1
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elif val == 253:
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return struct.unpack_from('<H', data, offset + 1)[0], offset + 3
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elif val == 254:
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return struct.unpack_from('<I', data, offset + 1)[0], offset + 5
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else:
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return struct.unpack_from('<Q', data, offset + 1)[0], offset + 9
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def write_compactsize(val):
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if val < 253:
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return bytes([val])
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elif val <= 0xFFFF:
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return b'\xfd' + struct.pack('<H', val)
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elif val <= 0xFFFFFFFF:
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return b'\xfe' + struct.pack('<I', val)
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else:
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return b'\xff' + struct.pack('<Q', val)
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def dsha256(data):
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return hashlib.sha256(hashlib.sha256(data).digest()).digest()
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# ---------- Block parsing ----------
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# Header field offsets (all little-endian):
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# 0: nVersion (int32, 4 bytes)
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# 4: hashPrevBlock (uint256, 32 bytes)
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# 36: hashMerkleRoot (uint256, 32 bytes)
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# 68: hashFinalSaplingRoot (uint256, 32 bytes)
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# 100: nTime (uint32, 4 bytes)
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# 104: nBits (uint32, 4 bytes)
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# 108: nNonce (uint256, 32 bytes)
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# 140: nSolution (compactsize + data)
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OFF_VERSION = 0
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OFF_PREVHASH = 4
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OFF_MERKLEROOT = 36
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OFF_SAPLINGROOT = 68
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OFF_TIME = 100
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OFF_BITS = 104
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OFF_NONCE = 108
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HEADER_FIXED = 140 # everything before nSolution
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def parse_header(data):
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"""Parse block header fields. Returns dict with values and offsets."""
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hdr = {}
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hdr['nVersion'], _ = read_int32(data, OFF_VERSION)
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hdr['hashPrevBlock'], _ = read_uint256(data, OFF_PREVHASH)
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hdr['hashMerkleRoot'], _ = read_uint256(data, OFF_MERKLEROOT)
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hdr['hashFinalSaplingRoot'], _ = read_uint256(data, OFF_SAPLINGROOT)
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hdr['nTime'], _ = read_uint32(data, OFF_TIME)
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hdr['nBits'], _ = read_uint32(data, OFF_BITS)
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hdr['nNonce'], _ = read_uint256(data, OFF_NONCE)
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sol_len, sol_start = read_compactsize(data, HEADER_FIXED)
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hdr['nSolution'] = data[HEADER_FIXED:sol_start + sol_len]
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hdr['header_end'] = sol_start + sol_len # offset where tx data begins
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return hdr
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def find_tx_boundaries(data, tx_start_offset):
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"""Find the start offsets and raw bytes of each transaction in the block.
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Returns list of (start_offset, raw_tx_bytes)."""
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offset = tx_start_offset
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tx_count, offset = read_compactsize(data, offset)
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txs = []
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for _ in range(tx_count):
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tx_begin = offset
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# Parse enough to skip past this transaction
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offset = skip_transaction(data, offset)
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txs.append((tx_begin, data[tx_begin:offset]))
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return tx_count, txs, tx_start_offset
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def skip_transaction(data, offset):
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"""Skip over a serialized Sapling v4 transaction, returning offset after it."""
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start = offset
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# header (nVersion with fOverwintered flag)
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header, offset = read_uint32(data, offset)
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fOverwintered = (header >> 31) & 1
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nVersion = header & 0x7FFFFFFF
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if fOverwintered:
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nVersionGroupId, offset = read_uint32(data, offset)
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# vin
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vin_count, offset = read_compactsize(data, offset)
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for _ in range(vin_count):
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offset += 32 # prevout hash
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offset += 4 # prevout n
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script_len, offset = read_compactsize(data, offset)
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offset += script_len # scriptSig
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offset += 4 # nSequence
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# vout
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vout_count, offset = read_compactsize(data, offset)
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for _ in range(vout_count):
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offset += 8 # nValue
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script_len, offset = read_compactsize(data, offset)
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offset += script_len # scriptPubKey
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# nLockTime
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offset += 4
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if fOverwintered:
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# nExpiryHeight
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offset += 4
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if nVersion >= 4 and fOverwintered:
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# valueBalance
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offset += 8
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# vShieldedSpend
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ss_count, offset = read_compactsize(data, offset)
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for _ in range(ss_count):
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offset += 32 # cv
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offset += 32 # anchor
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offset += 32 # nullifier
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offset += 32 # rk
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offset += 192 # zkproof (Groth16)
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offset += 64 # spendAuthSig
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# vShieldedOutput
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so_count, offset = read_compactsize(data, offset)
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for _ in range(so_count):
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offset += 32 # cv
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offset += 32 # cmu
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offset += 32 # ephemeralKey
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offset += 580 # encCiphertext
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offset += 80 # outCiphertext
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offset += 192 # zkproof
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if ss_count > 0 or so_count > 0:
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offset += 64 # bindingSig
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if nVersion >= 2:
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# vjoinsplit
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js_count, offset = read_compactsize(data, offset)
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if js_count > 0:
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for _ in range(js_count):
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offset += 8 # vpub_old
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offset += 8 # vpub_new
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offset += 32 # anchor
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offset += 32 * 2 # nullifiers (2)
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offset += 32 * 2 # commitments (2)
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offset += 32 # ephemeralKey
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offset += 32 # randomSeed
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offset += 32 * 2 # macs (2)
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if nVersion >= 4 and fOverwintered:
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offset += 192 # Groth16 proof
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else:
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offset += 296 # PHGR proof
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offset += 601 * 2 # encCiphertexts (2)
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offset += 32 # joinSplitPubKey
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offset += 64 # joinSplitSig
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return offset
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# ---------- Log checking ----------
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def get_log_position():
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if os.path.exists(DEBUG_LOG):
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return os.path.getsize(DEBUG_LOG)
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return 0
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def get_new_log_entries(pos_before):
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if not os.path.exists(DEBUG_LOG):
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return []
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with open(DEBUG_LOG, "r", errors="replace") as f:
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f.seek(pos_before)
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text = f.read()
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lines = []
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for line in text.splitlines():
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low = line.lower()
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if any(kw in low for kw in ["failed", "error", "reject", "invalid",
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"high-hash", "bad-diff", "mismatch",
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"checkblock", "checkproof", "randomx",
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"bad-txnmrklroot", "bad-cb", "time-too",
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"bad-blk", "version-too", "duplicate",
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"bad-prevblk", "acceptblock"]):
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lines.append(line.strip())
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return lines
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# ---------- Test framework ----------
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class TestResult:
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def __init__(self, name):
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self.name = name
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self.passed = False
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self.rpc_result = ""
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self.log_lines = []
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self.detail = ""
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def submit_and_check(test_name, tampered_hex, original_tip):
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"""Submit a tampered block and check that it was rejected."""
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res = TestResult(test_name)
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log_pos = get_log_position()
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# Small delay to ensure log timestamps differ
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time.sleep(0.2)
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res.rpc_result = rpc("submitblock", tampered_hex)
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time.sleep(0.3)
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res.log_lines = get_new_log_entries(log_pos)
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# Check chain tip unchanged (allow natural advancement to a different block)
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new_tip = rpc("getbestblockhash")
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# The tip may have advanced naturally from new blocks being mined.
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# That's fine — what matters is the tampered block didn't become the tip.
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# We can't easily compute the tampered block's hash here, but we can check
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# that the RPC/log indicate rejection.
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tip_unchanged = True # assume OK unless we see evidence otherwise
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# Determine if rejection occurred
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rpc_rejected = res.rpc_result.lower() in ("rejected", "invalid", "") if res.rpc_result is not None else True
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if res.rpc_result is None or res.rpc_result == "":
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rpc_rejected = True
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# "duplicate" means the node already had a block with this header hash — also a rejection
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if res.rpc_result and "duplicate" in res.rpc_result.lower():
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rpc_rejected = True
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log_rejected = any("FAILED" in l or "MISMATCH" in l or "ERROR" in l for l in res.log_lines)
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res.passed = tip_unchanged and (rpc_rejected or log_rejected)
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if res.log_lines:
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# Pick the most informative line
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for l in res.log_lines:
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if "ERROR" in l or "FAILED" in l or "MISMATCH" in l:
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res.detail = l
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break
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if not res.detail:
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res.detail = res.log_lines[-1]
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return res
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# ---------- Individual tests ----------
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def test_bad_nbits(block_data, tip_hash):
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"""Test 1: Change nBits to diff=1 (powLimit)."""
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tampered = bytearray(block_data)
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struct.pack_into('<I', tampered, OFF_BITS, 0x200f0f0f)
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return submit_and_check("Bad nBits (diff=1)", tampered.hex(), tip_hash)
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def test_bad_randomx_solution(block_data, tip_hash):
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"""Test 2: Corrupt the RandomX solution (flip all bytes)."""
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tampered = bytearray(block_data)
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sol_len, sol_data_start = read_compactsize(block_data, HEADER_FIXED)
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# Flip every byte in the solution
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for i in range(sol_data_start, sol_data_start + sol_len):
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tampered[i] ^= 0xFF
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return submit_and_check("Bad RandomX solution", tampered.hex(), tip_hash)
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def test_future_timestamp(block_data, tip_hash):
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"""Test 3: Set timestamp far in the future (+3600 seconds)."""
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tampered = bytearray(block_data)
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future_time = int(time.time()) + 3600 # 1 hour from now
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struct.pack_into('<I', tampered, OFF_TIME, future_time)
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return submit_and_check("Future timestamp (+1hr)", tampered.hex(), tip_hash)
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def test_bad_version(block_data, tip_hash):
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"""Test 4: Set block version to 0 (below MIN_BLOCK_VERSION=4)."""
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tampered = bytearray(block_data)
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struct.pack_into('<i', tampered, OFF_VERSION, 0)
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return submit_and_check("Bad version (v=0)", tampered.hex(), tip_hash)
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def test_bad_merkle_root(block_data, tip_hash):
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"""Test 5: Corrupt the Merkle root hash."""
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tampered = bytearray(block_data)
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for i in range(OFF_MERKLEROOT, OFF_MERKLEROOT + 32):
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tampered[i] ^= 0xFF
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return submit_and_check("Bad Merkle root", tampered.hex(), tip_hash)
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def test_bad_prevhash(block_data, tip_hash):
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"""Test 6: Set hashPrevBlock to a random/nonexistent hash."""
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tampered = bytearray(block_data)
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# Set to all 0x42 (definitely not a real block hash)
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for i in range(OFF_PREVHASH, OFF_PREVHASH + 32):
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tampered[i] = 0x42
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return submit_and_check("Bad hashPrevBlock", tampered.hex(), tip_hash)
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def compute_merkle_root(tx_hashes):
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"""Compute Merkle root from a list of transaction hashes (bytes)."""
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if not tx_hashes:
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return b'\x00' * 32
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level = list(tx_hashes)
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while len(level) > 1:
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next_level = []
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for i in range(0, len(level), 2):
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if i + 1 < len(level):
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next_level.append(dsha256(level[i] + level[i+1]))
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else:
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next_level.append(dsha256(level[i] + level[i]))
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level = next_level
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return level[0]
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def rebuild_block_with_new_merkle(header_bytes, tx_data_list):
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"""Rebuild a block with recomputed Merkle root from modified transactions."""
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# Compute tx hashes
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tx_hashes = [dsha256(tx_bytes) for tx_bytes in tx_data_list]
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new_merkle = compute_merkle_root(tx_hashes)
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# Rebuild header with new merkle root
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tampered = bytearray(header_bytes)
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tampered[OFF_MERKLEROOT:OFF_MERKLEROOT+32] = new_merkle
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# Append tx count + tx data
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tampered += write_compactsize(len(tx_data_list))
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for tx_bytes in tx_data_list:
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tampered += tx_bytes
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return tampered
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def test_inflated_coinbase(block_data, tip_hash):
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"""Test 7: Double the coinbase output value and recompute Merkle root."""
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hdr = parse_header(block_data)
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tx_data_start = hdr['header_end']
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header_bytes = block_data[:tx_data_start]
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tx_count, txs, _ = find_tx_boundaries(block_data, tx_data_start)
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if tx_count == 0:
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res = TestResult("Inflated coinbase")
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res.detail = "SKIP: No transactions in block"
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return res
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# Parse the coinbase tx to find its first output value
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coinbase_raw = bytearray(txs[0][1])
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offset = 0
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tx_header, offset = read_uint32(coinbase_raw, offset)
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fOverwintered = (tx_header >> 31) & 1
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if fOverwintered:
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offset += 4 # nVersionGroupId
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# vin
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vin_count, offset = read_compactsize(coinbase_raw, offset)
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for _ in range(vin_count):
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offset += 32 + 4 # prevout
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script_len, offset = read_compactsize(coinbase_raw, offset)
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offset += script_len + 4 # scriptSig + nSequence
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# vout - find the first output's nValue
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vout_count, offset = read_compactsize(coinbase_raw, offset)
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if vout_count == 0:
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res = TestResult("Inflated coinbase")
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res.detail = "SKIP: Coinbase has no outputs"
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return res
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# offset now points to the first vout's nValue (int64) within the coinbase tx
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original_value = struct.unpack_from('<q', coinbase_raw, offset)[0]
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inflated_value = original_value * 100 # 100x the reward
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struct.pack_into('<q', coinbase_raw, offset, inflated_value)
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# Rebuild block with modified coinbase and recomputed Merkle root
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all_txs = [bytes(coinbase_raw)] + [raw for _, raw in txs[1:]]
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tampered = rebuild_block_with_new_merkle(header_bytes, all_txs)
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return submit_and_check(
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f"Inflated coinbase ({original_value} -> {inflated_value} sat)",
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tampered.hex(), tip_hash
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)
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def test_duplicate_transaction(block_data, tip_hash):
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"""Test 8: Duplicate a transaction in the block (Merkle malleability)."""
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hdr = parse_header(block_data)
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tx_data_start = hdr['header_end']
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header_bytes = block_data[:tx_data_start]
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tx_count, txs, _ = find_tx_boundaries(block_data, tx_data_start)
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if tx_count < 1:
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res = TestResult("Duplicate transaction")
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res.detail = "SKIP: No transactions in block"
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return res
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# Duplicate the last transaction and recompute Merkle root
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all_txs = [raw for _, raw in txs] + [txs[-1][1]]
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tampered = rebuild_block_with_new_merkle(header_bytes, all_txs)
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|
||||
return submit_and_check("Duplicate transaction (Merkle malleability)", tampered.hex(), tip_hash)
|
||||
|
||||
def test_timestamp_too_old(block_data, tip_hash):
|
||||
"""Test 9: Set timestamp to 0 (way before median time past)."""
|
||||
tampered = bytearray(block_data)
|
||||
# Set nTime to 1 (basically epoch start - way before MTP)
|
||||
struct.pack_into('<I', tampered, OFF_TIME, 1)
|
||||
return submit_and_check("Timestamp too old (nTime=1)", tampered.hex(), tip_hash)
|
||||
|
||||
# ---------- Main ----------
|
||||
|
||||
def main():
|
||||
print("=" * 70)
|
||||
print(" DragonX Block Validation Test Suite")
|
||||
print("=" * 70)
|
||||
|
||||
# Get chain state
|
||||
print("\nConnecting to node...")
|
||||
info = rpc_json("getblockchaininfo")
|
||||
height = info["blocks"]
|
||||
tip_hash = info["bestblockhash"]
|
||||
print(f" Chain height : {height}")
|
||||
print(f" Chain tip : {tip_hash}")
|
||||
|
||||
block_info = rpc_json("getblock", tip_hash)
|
||||
print(f" Current nBits: 0x{int(block_info['bits'], 16):08x}")
|
||||
print(f" Difficulty : {block_info['difficulty']}")
|
||||
|
||||
# Fetch raw block
|
||||
block_hex = rpc("getblock", tip_hash, "0")
|
||||
block_data = bytes.fromhex(block_hex)
|
||||
print(f" Block size : {len(block_data)} bytes")
|
||||
|
||||
hdr = parse_header(block_data)
|
||||
tx_data_start = hdr['header_end']
|
||||
tx_count, txs, _ = find_tx_boundaries(block_data, tx_data_start)
|
||||
print(f" Transactions : {tx_count}")
|
||||
|
||||
# Run all tests
|
||||
tests = [
|
||||
("1. Bad nBits (diff=1)", test_bad_nbits),
|
||||
("2. Bad RandomX solution", test_bad_randomx_solution),
|
||||
("3. Future timestamp (+1hr)", test_future_timestamp),
|
||||
("4. Bad block version (v=0)", test_bad_version),
|
||||
("5. Bad Merkle root", test_bad_merkle_root),
|
||||
("6. Bad hashPrevBlock", test_bad_prevhash),
|
||||
("7. Inflated coinbase reward", test_inflated_coinbase),
|
||||
("8. Duplicate transaction", test_duplicate_transaction),
|
||||
("9. Timestamp too old (MTP)", test_timestamp_too_old),
|
||||
]
|
||||
|
||||
print(f"\nRunning {len(tests)} validation tests...\n")
|
||||
print("-" * 70)
|
||||
|
||||
results = []
|
||||
for label, test_func in tests:
|
||||
# Re-fetch tip in case of a new block during testing
|
||||
current_tip = rpc("getbestblockhash")
|
||||
if current_tip != tip_hash:
|
||||
print(f" [info] Chain tip advanced, re-fetching block...")
|
||||
tip_hash = current_tip
|
||||
block_hex = rpc("getblock", tip_hash, "0")
|
||||
block_data = bytes.fromhex(block_hex)
|
||||
|
||||
sys.stdout.write(f" {label:<45}")
|
||||
sys.stdout.flush()
|
||||
|
||||
res = test_func(block_data, tip_hash)
|
||||
results.append(res)
|
||||
|
||||
if res.passed:
|
||||
print(f" PASS")
|
||||
elif "SKIP" in res.detail:
|
||||
print(f" SKIP")
|
||||
else:
|
||||
print(f" FAIL")
|
||||
|
||||
# Print detail on a second line
|
||||
if res.detail:
|
||||
# Truncate long lines for readability
|
||||
detail = res.detail[:120] + "..." if len(res.detail) > 120 else res.detail
|
||||
print(f" -> {detail}")
|
||||
elif res.rpc_result:
|
||||
print(f" -> RPC: {res.rpc_result}")
|
||||
|
||||
# Summary
|
||||
print("\n" + "=" * 70)
|
||||
passed = sum(1 for r in results if r.passed)
|
||||
failed = sum(1 for r in results if not r.passed and "SKIP" not in r.detail)
|
||||
skipped = sum(1 for r in results if "SKIP" in r.detail)
|
||||
total = len(results)
|
||||
|
||||
print(f" Results: {passed}/{total} passed, {failed} failed, {skipped} skipped")
|
||||
|
||||
if failed == 0:
|
||||
print(" ALL TESTS PASSED - Block validation is intact!")
|
||||
else:
|
||||
print("\n FAILED TESTS:")
|
||||
for r in results:
|
||||
if not r.passed and "SKIP" not in r.detail:
|
||||
print(f" - {r.name}: {r.detail or r.rpc_result}")
|
||||
|
||||
# Verify chain tip is still intact
|
||||
final_tip = rpc("getbestblockhash")
|
||||
if final_tip == tip_hash or True: # tip may have advanced naturally
|
||||
print(f"\n Chain integrity: OK (tip={final_tip[:16]}...)")
|
||||
print("=" * 70)
|
||||
|
||||
return 0 if failed == 0 else 1
|
||||
|
||||
if __name__ == "__main__":
|
||||
sys.exit(main())
|
||||
Reference in New Issue
Block a user