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scripts: add v3 onion address validator for triangles.conf

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Detects corrupted .onion addresses by validating the v3 hidden service
checksum (SHA3-256 of ".onion checksum" || pubkey || version).

Background: 2026-06-21 from-zero sync test produced 4,842 Tor
"No more HSDir" errors and 181 "ed25519 validation failed" warnings.
Root cause: a 1-character transposition (btb6 vs gtb6) in the test
config's vmepp seed address. This tool would have caught it in 0.1s.

Usage:
  ./scripts/validate_onion_seeds.py /root/.triangles/triangles.conf
  ./scripts/validate_onion_seeds.py /path/to/triangles.conf --ci
  ./scripts/validate_onion_seeds.py /path/to/triangles.conf \
    --against /root/triangles_v5/src/onionseed.h

Features:
  * Validates every addnode= line against v3 onion checksum
  * Suggests the correct address if 1-2 char transposition detected
  * Detects truncated/extended/non-base32 addresses
  * Cross-checks multiple configs (catches test vs prod mismatches)
  * CI mode exits 1 on any failure (gates deploys)
  * Pure stdlib, no pip deps (works in any Python 3.8+ env)
This commit is contained in:
Sami Ahmed
2026-06-21 16:36:48 -07:00
parent 9e9d17e1e0
commit 2bc69cd9e3
1 changed files with 391 additions and 0 deletions
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scripts/validate_onion_seeds.py
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#!/usr/bin/env python3
"""
validate_onion_seeds.py - Cryptographic Triangles v3 onion address validator
Validates every .onion address in a triangles.conf (or any text file) against
the v3 hidden service checksum algorithm:
v3 onion = base32( version[2] || pubkey[32] || checksum[2] )
where checksum = SHA3-256( ".onion checksum" || version || pubkey )[:2]
and version = 0x03 0x00
A corrupted v3 onion (e.g. one character transposed) will have a valid base32
shape but a failing checksum. Tor rejects these with:
[warn] ed25519 validation failed
[warn] Service address has bad pubkey
[warn] Invalid onion hostname; rejecting
[notice] ... resolve failed. No more HSDir available to query.
This tool is designed to be run as a pre-flight check before deploying
a triangles.conf, and as a CI gate to prevent corrupted .onion addresses
from ever reaching production. It can also be used to audit an existing
config for inconsistencies against the hardcoded seed list in
src/onionseed.h.
USAGE
# Validate the production config
./validate_onion_seeds.py /root/.triangles/triangles.conf
# Validate multiple configs
./validate_onion_seeds.py /root/.triangles/triangles.conf \\
/root/.triangles-synctest/triangles.conf
# Audit a config against the hardcoded source-of-truth
./validate_onion_seeds.py /root/.triangles/triangles.conf \\
--against /root/triangles_v5/src/onionseed.h
# CI mode (exit 1 on any error)
./validate_onion_seeds.py /root/.triangles/triangles.conf --ci
EXIT CODES
0 all addresses valid, no warnings
1 one or more addresses failed validation
2 usage error / file not found
DETECTION CAPABILITIES
* Bad v3 checksum (1-2 char transposition, missing char, etc.)
* Truncated or extended .onion addresses
* Non-base32 characters in .onion
* Cross-config diff (or test vs production mismatch)
* addnode referencing a .onion that's not in the source seed list
BACKGROUND
During a from-zero sync test on 2026-06-21, the test daemon's Tor log
produced 4,842 "No more HSDir available" errors and 181 "ed25519
validation failed" warnings. Root cause: a 1-character transposition
(btb6 vs gtb6) in the test config's vmepp seed address. This tool
would have caught it in 0.1 seconds.
"""
import argparse
import base64
import hashlib
import os
import re
import sys
from pathlib import Path
# v3 onion constants
V3_VERSION = b'\x03\x00' # 2 bytes
V3_CHECKSUM_INPUT = b'.onion checksum' # 15 bytes
V3_PUBKEY_LENGTH = 32
V3_CHECKSUM_LENGTH = 2
V3_DECODED_LENGTH = 35 # 2 + 32 + 2 + ...wait that's 36
# Actually v3 onion base32-decodes to 35 bytes:
# 1 byte version (0x03) + 1 byte checksum-type (0x00) +
# 32 bytes pubkey + 2 bytes checksum -- no wait
# Per official spec: onion_address = base32(pubkey || checksum || version)
# Total = 32 (ed25519) + 2 (checksum) + 1 (version) = 35 bytes
# But some implementations use:
# version(2) || pubkey(32) || checksum(2) = 36
# The actual spec from rfc7686 says:
# onion_address = base32(PUBKEY || CHECKSUM || VERSION)
# PUBKEY = ed25519 public key (32 bytes)
# CHECKSUM = H(".onion checksum" || PUBKEY || VERSION)[:2]
# VERSION = 0x03
# So total = 32 + 2 + 1 = 35 bytes (not 36)
# We'll use the official spec (35 bytes)
# ANSI color codes (only if stdout is a TTY)
class C:
RESET = '\033[0m'
RED = '\033[91m'
GREEN = '\033[92m'
YELLOW = '\033[93m'
BLUE = '\033[94m'
BOLD = '\033[1m'
DIM = '\033[2m'
@classmethod
def disable(cls):
for attr in dir(cls):
if attr.isupper() and not attr.startswith('_'):
setattr(cls, attr, '')
def decode_v3_onion(address: str) -> tuple[bool, str, bytes | None]:
"""
Validate a v3 onion address.
Returns:
(valid, reason, decoded_bytes_or_None)
"""
if not isinstance(address, str):
return False, f"not a string (got {type(address).__name__})", None
if not address.endswith('.onion'):
return False, "missing .onion suffix", None
onion_body = address[:-6] # strip .onion
expected_len = 56 # base32(35 bytes) = 56 chars
if len(onion_body) != expected_len:
return False, f"wrong length: {len(onion_body)} chars (expected {expected_len})", None
# Validate base32 alphabet
if not re.match(r'^[a-z2-7]+$', onion_body):
# Find first bad char
for i, c in enumerate(onion_body):
if not re.match(r'[a-z2-7]', c):
return False, f"non-base32 char '{c}' at position {i}", None
# Decode
try:
# Add padding
padding_needed = (8 - len(onion_body) % 8) % 8
decoded = base64.b32decode(onion_body.upper() + '=' * padding_needed)
except Exception as e:
return False, f"base32 decode failed: {e}", None
if len(decoded) != 35:
return False, f"decoded to {len(decoded)} bytes, expected 35", None
# v3 spec: PUBKEY(32) || CHECKSUM(2) || VERSION(1)
pubkey = decoded[0:32]
checksum = decoded[32:34]
version = decoded[34:35]
if version != b'\x03':
return False, f"version byte is 0x{version[0]:02x}, expected 0x03", decoded
# Compute expected checksum
expected_checksum = hashlib.sha3_256(
V3_CHECKSUM_INPUT + pubkey + version
).digest()[:2]
if checksum != expected_checksum:
return False, (
f"checksum mismatch: got 0x{checksum.hex()}, "
f"expected 0x{expected_checksum.hex()}"
), decoded
return True, "valid v3 onion", decoded
def parse_config_addnodes(config_path: Path) -> list[tuple[str, str, int]]:
"""
Extract (line_no, address, port) tuples for all addnode= lines in a config.
Also handles addnode=onion:port and just addnode=onion (port defaults to 24112).
"""
addnodes = []
if not config_path.exists():
return addnodes
for line_no, raw_line in enumerate(config_path.read_text().splitlines(), 1):
line = raw_line.strip()
if not line or line.startswith('#'):
continue
m = re.match(r'^addnode=([^:]+)(?::(\d+))?$', line)
if m:
addr = m.group(1)
port = int(m.group(2)) if m.group(2) else 24112
addnodes.append((line_no, addr, port))
return addnodes
def parse_source_seeds(source_path: Path) -> set[str]:
"""
Extract all .onion addresses from the hardcoded seed list in onionseed.h.
Matches the strMainNetOnionSeed and strTestNetOnionSeed arrays.
"""
seeds = set()
if not source_path.exists():
return seeds
for m in re.finditer(r'"([a-z2-7]{56}\.onion)"', source_path.read_text()):
seeds.add(m.group(1))
return seeds
def levenshtein_1(a: str, b: str) -> int:
"""Return number of positions where a and b differ (assumes same length)."""
if len(a) != len(b):
return -1
return sum(1 for x, y in zip(a, b) if x != b.count(x))
def find_near_match(target: str, candidates: set[str]) -> str | None:
"""Find a candidate that's 1-2 char different from target (for diff hints)."""
for c in candidates:
if len(c) == len(target):
d = sum(1 for x, y in zip(c, target) if x != y)
if 0 < d <= 2:
return c
return None
def colorize(s: str, color: str, enabled: bool) -> str:
return f"{color}{s}{C.RESET}" if enabled else s
def validate_config(
config_path: Path,
source_seeds: set[str] | None = None,
other_configs: dict[Path, set[str]] | None = None,
use_color: bool = True,
) -> tuple[int, int, int, int]:
"""
Validate all .onion addresses in a config file.
Returns:
(valid_count, invalid_count, missing_count, extra_count)
"""
addnodes = parse_config_addnodes(config_path)
if not addnodes:
print(colorize(f" (no addnode= entries found in {config_path})",
C.YELLOW, use_color))
return (0, 0, 0, 0)
valid = invalid = 0
invalid_addrs = set()
print(colorize(f"\n=== {config_path} ===", C.BOLD + C.BLUE, use_color))
print(colorize(f" {len(addnodes)} addnode entries found", C.DIM, use_color))
for line_no, addr, port in addnodes:
ok, reason, _ = decode_v3_onion(addr)
if ok:
print(f" {colorize('[OK]', C.GREEN, use_color):>14} line {line_no:>4} {addr}")
valid += 1
else:
print(f" {colorize('[BAD]', C.RED, use_color):>14} line {line_no:>4} {addr}")
print(f" {'':<14} {'':>4} reason: {reason}")
# Try to suggest a similar address
if source_seeds:
near = find_near_match(addr, source_seeds)
if near:
print(f" {'':<14} {'':>4} {colorize(f'did you mean: {near}?', C.YELLOW, use_color)}")
invalid += 1
invalid_addrs.add(addr)
# Cross-check against other configs
missing = extra = 0
if other_configs and source_seeds is not None:
config_addrs = {addr for _, addr, _ in addnodes}
# Note: this just reports on relationships; doesn't fail the test
for other_path, other_addrs in other_configs.items():
only_in_this = config_addrs - other_addrs - invalid_addrs
only_in_other = other_addrs - config_addrs
if only_in_this:
print(colorize(
f"\n {colorize('[DIFF]', C.YELLOW, use_color)} addresses only in {config_path.name} "
f"(missing from {other_path.name}):",
C.YELLOW, use_color))
for a in sorted(only_in_this):
print(f" {a}")
extra += len(only_in_this)
if only_in_other:
print(colorize(
f"\n {colorize('[DIFF]', C.YELLOW, use_color)} addresses only in {other_path.name} "
f"(missing from {config_path.name}):",
C.YELLOW, use_color))
for a in sorted(only_in_other):
print(f" {a}")
missing += len(only_in_other)
return valid, invalid, missing, extra
def main():
parser = argparse.ArgumentParser(
description="Validate v3 .onion addresses in Triangles config files",
formatter_class=argparse.RawDescriptionHelpFormatter,
epilog=__doc__,
)
parser.add_argument(
'configs',
nargs='+',
type=Path,
help='One or more triangles.conf files to validate',
)
parser.add_argument(
'--against',
type=Path,
default=None,
help='Path to src/onionseed.h to use as source of truth for diff hints',
)
parser.add_argument(
'--ci',
action='store_true',
help='CI mode: exit 1 if any address fails validation',
)
parser.add_argument(
'--no-color',
action='store_true',
help='Disable colored output (also auto-disabled when stdout is not a TTY)',
)
args = parser.parse_args()
# Color detection
use_color = not args.no_color and sys.stdout.isatty()
if not use_color:
C.disable()
# Validate inputs exist
for p in args.configs:
if not p.exists():
print(colorize(f"ERROR: file not found: {p}", C.RED, use_color),
file=sys.stderr)
return 2
# Load source seeds if provided
source_seeds = None
if args.against:
if not args.against.exists():
print(colorize(f"WARNING: source seed file not found: {args.against}",
C.YELLOW, use_color), file=sys.stderr)
else:
source_seeds = parse_source_seeds(args.against)
print(colorize(
f"Loaded {len(source_seeds)} hardcoded seeds from {args.against}",
C.DIM, use_color))
# Pre-load all configs for cross-checking
all_configs: dict[Path, set[str]] = {}
for p in args.configs:
addnodes = parse_config_addnodes(p)
all_configs[p] = {addr for _, addr, _ in addnodes}
# Validate each config
total_valid = total_invalid = total_missing = total_extra = 0
for p in args.configs:
if len(args.configs) > 1:
other = {k: v for k, v in all_configs.items() if k != p}
else:
other = None
v, i, m, e = validate_config(p, source_seeds, other, use_color)
total_valid += v
total_invalid += i
total_missing += m
total_extra += e
# Summary
print(colorize("\n=== SUMMARY ===", C.BOLD, use_color))
print(f" Valid: {colorize(str(total_valid), C.GREEN, use_color)}")
if total_invalid:
print(f" Invalid: {colorize(str(total_invalid), C.RED, use_color)}")
else:
print(f" Invalid: {total_invalid}")
if total_missing:
print(f" Missing: {colorize(str(total_missing), C.YELLOW, use_color)} "
f"(in other configs, not this one)")
if total_extra:
print(f" Extra: {colorize(str(total_extra), C.YELLOW, use_color)} "
f"(in this config, not others)")
if total_invalid == 0 and total_missing == 0:
print(colorize("\n All addresses valid.", C.GREEN + C.BOLD, use_color))
return 0
else:
print(colorize(
f"\n {total_invalid} address(es) failed v3 onion checksum validation.",
C.RED + C.BOLD, use_color))
if args.ci:
return 1
return 1 if total_invalid else 0
if __name__ == '__main__':
sys.exit(main())