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reverse-skills-max: initial public release (restored, redacted, hardened)

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Sync a script directory to a publish location, and audit it for machine-specific leftovers.
WHY THIS EXISTS
---------------
An Agent Skill gets copied across machines and across runtimes (Claude Code, Codex,
DeepSeek Harness). Anything machine-specific that survives the copy becomes a
landmine: a baked-in JDK path, a keystore password, a home directory that only
exists on the author's box. This tool does two things:
1. AUDIT (default, read-only): report every absolute-path literal that names
*this* machine, and every credential-looking constant, with file and line
number. Generic install locations (`Program Files` on Windows, `/usr/bin`
on POSIX) and already-redacted paths (carrying a `<placeholder>` or an
ellipsis) are exempt -- see `GENERIC_PATH_PREFIXES` and `_leaks_nothing`,
which exist because a gate whose output is mostly noise stops being read.
2. SYNC (--apply): copy matching files to the destination, optionally after
neutralising the absolute-path literals it found (--scrub).
The audit is the default on purpose: a silent copy is exactly how the leftovers
travel from the author's machine into someone else's first run.
USAGE
-----
python build_scripts.py scripts2 out # audit only, nothing written
python build_scripts.py scripts out --apply # copy
python build_scripts.py scripts out --apply --scrub # copy, neutralising abs paths
python build_scripts.py scripts out --pattern '*.py' --pattern '*.js'
Exit codes: 0 = clean, 2 = findings reported (audit mode), 1 = usage or IO error.
NOTES
-----
* A finding is a heuristic, not a verdict: `/data/local/tmp/...` is a legitimate
Android device path and is deliberately NOT reported; a drive-letter path is.
* --scrub rewrites `'<abs path>'` literals into `''`, which keeps the file
syntactically valid but leaves the decision (and the fix) to a human. It never
runs unless --apply is also given.
"""
import argparse
import fnmatch
import os
import re
import shutil
import sys
DEFAULT_PATTERNS = ('*.py', '*.js', '*.java', '*.md', '*.txt')
# Absolute-path literals that belong to one particular machine.
# Deliberately excluded: /data/... (an Android device path, not a host path).
WINDOWS_LITERAL = re.compile(r"(?P<prefix>(?:r|u|b)?r?)(?P<quote>['\"])"
r"(?P<path>[A-Za-z]:[\\/][^'\"]*)(?P=quote)")
POSIX_LITERAL = re.compile(r"(?P<prefix>(?:r|u|b)?r?)(?P<quote>['\"])"
r"(?P<path>/(?:home|Users|mnt)/[^'\"]*)(?P=quote)")
# Any drive-letter or foreign-home path outside a quoted literal as well.
# Tuned to avoid the two false-positive families that made an earlier version of
# this audit useless: a URL scheme ("https://" contains "s:" + "/") and a Python
# escape sequence ("is:\n" contains "s:" + "\"). Hence: the previous character must
# not be alphanumeric, a drive letter must be followed by a real backslash (not an
# escape letter, not a second separator), and the POSIX form must start a path.
BARE_ABS = re.compile(
r"(?<![A-Za-z0-9])(?:"
r"[A-Za-z]:\\(?![ntr0bxu'\"\\])\S{2,}"
r"|/(?:home|Users|mnt)/[A-Za-z0-9_.\-]{2,}"
r")")
CREDENTIAL_HINT = re.compile(
r"(?i)(BEGIN [A-Z ]*PRIVATE KEY|storepass\s*=\s*['\"][^'\"]|"
r"keypass\s*=\s*['\"][^'\"]|password\s*=\s*['\"][^'\"]|"
r"api[_-]?key\s*=\s*['\"][^'\"]|secret\s*=\s*['\"][^'\"]{6,})")
# ---------------------------------------------------------------------------
# What is NOT a machine-specific leftover.
#
# This audit exists to catch paths that leak *this* machine's layout. Two
# families look like absolute paths but leak nothing, and reporting them is
# what made an earlier version of this gate unreadable: 37 findings on the pass
# that introduced the evidence record, of which the large majority were these
# two families. A gate whose output is mostly noise is a gate people stop
# reading, so the exemptions are explicit and auditable rather than silent.
#
# 1. Generic install locations. `C:\Program Files\...` exists on every Windows
# host and `/usr/bin/...` on every POSIX host; naming one names the
# platform, not the machine. Same for a distribution's own paths.
# `/data/...` is already excluded above for the same reason -- it is a
# device path, not a host path.
#
# 2. Already-redacted paths. A path carrying a `<placeholder>` or an ellipsis
# has been through a normalisation pass deliberately; re-reporting it
# punishes the correct behaviour. `scan_leaks.py` reads the same signal as
# PLACEHOLDER_TOKENS for target identity.
#
# What remains is a drive or home path with no placeholder: a real workbench
# location. That is the thing worth failing on, and the thing to fix in the
# document rather than in this list.
GENERIC_PATH_PREFIXES = (
# Windows, generic
'c:\\program files', 'c:\\program files (x86)', 'c:\\windows',
'c:\\python', 'c:\\mingw', 'c:\\msys', 'c:\\cygwin', 'c:\\strawberry',
'c:\\android', 'c:\\android-sdk', 'c:\\users\\public', 'c:\\users\\default',
# POSIX, generic
'/usr/', '/opt/', '/etc/', '/var/', '/tmp/', '/bin/', '/sbin/',
)
# `<user>`, `<name>`, `<path>`, `<serial>` -- a placeholder is the mark of a path
# that has already been made portable on purpose.
PLACEHOLDER_RE = re.compile(r'<[A-Za-z_][A-Za-z0-9_.\-]*>')
# A literal ellipsis in a path means the middle was deliberately elided.
ELLIPSIS_RE = re.compile(r'\.\.\.|\u2026')
def _leaks_nothing(path):
"""True when an absolute path says nothing about this particular machine.
Kept separate from the matching rules so the exemption can be tested and
argued with on its own, rather than being folded into the regex.
The comparison is **bidirectional on purpose**. `BARE_ABS` stops at
whitespace (it cannot know where a path ends), so a real
`C:\\Program Files\\...` arrives here as the truncated `C:\\Program`. A
one-directional `startswith` then misses the exemption and reports a path
that exists on every Windows host. Requiring a minimum length keeps the
reverse direction from turning a short drive prefix into a blanket pass.
"""
low = path.lower().replace('/', '\\')
for prefix in GENERIC_PATH_PREFIXES:
p = prefix.replace('/', '\\')
if low.startswith(p):
return True
if len(low) >= 8 and p.startswith(low):
return True
# A bare user-directory root names no one -- only the segment after it does.
# `C:\Users\` appears legitimately when a document describes a rule rather
# than quoting a location, so it is exempt, while a personal name in that
# position still reports. Phrased without a placeholder on purpose:
# `scan_leaks.py` recognises a fixed token list, and an invented one reads
# to it as the very name this rule is trying to catch.
#
# The lookahead must exclude a following separator as well as alphanumerics.
# With only `[a-z0-9]` the optional `\\?` backtracks: it matches the empty
# string, the next character is the separator, that passes the lookahead, and
# a real personal path is swallowed. Excluding both is what separates a
# harmless root from a leak. `BARE_ABS` can also append punctuation (a
# trailing backtick), which is why the rule is a lookahead and not `$`.
if re.match(r'^c:\\users\\?(?![\\a-z0-9])', low):
return True
if PLACEHOLDER_RE.search(path) or ELLIPSIS_RE.search(path):
return True
return False
def collect(src, patterns):
"""Return [(absolute_path, relative_path)] for every matching file."""
out = []
for root, _dirs, files in os.walk(src):
for name in sorted(files):
if any(fnmatch.fnmatch(name, p) for p in patterns):
full = os.path.join(root, name)
out.append((full, os.path.relpath(full, src)))
return out
def audit(path, rel):
"""Return [(kind, lineno, detail)] for one file."""
findings = []
try:
with open(path, encoding='utf-8', errors='replace') as fh:
lines = fh.readlines()
except OSError as exc:
return [('io-error', 0, str(exc))]
for lineno, line in enumerate(lines, 1):
for match in BARE_ABS.finditer(line):
hit = match.group(0)
# Report only paths that actually name this machine; a generic
# install location or an already-redacted path is not a leftover.
if _leaks_nothing(hit):
continue
findings.append(('machine-path', lineno, hit[:90]))
if CREDENTIAL_HINT.search(line):
findings.append(('credential', lineno, line.strip()[:110]))
return findings
def scrub(text):
"""Neutralise absolute-path literals; returns (new_text, count)."""
total = 0
def repl(_match):
return "''"
for pattern in (WINDOWS_LITERAL, POSIX_LITERAL):
text, count = pattern.subn(repl, text)
total += count
return text, total
def main():
# A finding can quote a byte or a path the console's code page cannot
# represent -- a Windows console defaults to a legacy encoding such as
# cp936 or cp1252. Without this, the audit dies with UnicodeEncodeError
# *while reporting its own result*, which reads as "the tool is broken"
# instead of "here is what it found".
try:
sys.stdout.reconfigure(errors='replace')
except (AttributeError, ValueError):
pass
ap = argparse.ArgumentParser(
description='Sync a script directory to a publish location and audit it for '
'machine-specific leftovers (absolute paths, hardcoded credentials).')
ap.add_argument('src', help='source directory to publish from')
ap.add_argument('dst', help='destination directory to publish into')
ap.add_argument('--pattern', action='append', default=list(DEFAULT_PATTERNS),
help='glob to include, repeatable (default: %s)'
% ' '.join(DEFAULT_PATTERNS))
ap.add_argument('--apply', action='store_true',
help='actually copy files (default is audit only)')
ap.add_argument('--scrub', action='store_true',
help='with --apply, neutralise absolute-path literals in the copies')
args = ap.parse_args()
if not os.path.isdir(args.src):
print('error: source directory not found: %s' % args.src)
return 1
files = collect(args.src, args.pattern)
if not files:
print('error: no files matched %s in %s'
% (', '.join(args.pattern), args.src))
return 1
total_findings = 0
scrubbed = 0
copied = 0
for full, rel in files:
findings = audit(full, rel)
path_findings = [f for f in findings if f[0] == 'machine-path']
cred_findings = [f for f in findings if f[0] == 'credential']
other = [f for f in findings if f[0] not in ('machine-path', 'credential')]
if findings:
print('-- %s' % rel)
for kind, lineno, detail in path_findings + cred_findings + other:
print(' [%s] line %d: %s' % (kind, lineno, detail))
total_findings += len(findings)
if not args.apply:
continue
target = os.path.join(args.dst, rel)
os.makedirs(os.path.dirname(target) or '.', exist_ok=True)
if args.scrub and (path_findings or cred_findings):
with open(full, encoding='utf-8', errors='replace') as fh:
text = fh.read()
new_text, count = scrub(text)
if count:
with open(target, 'w', encoding='utf-8', newline='\n') as fh:
fh.write(new_text)
scrubbed += count
print(' -> copied with %d absolute-path literal(s) neutralised' % count)
copied += 1
continue
shutil.copy2(full, target)
copied += 1
print('')
if not args.apply:
print('== audit: %d file(s) checked, %d finding(s). Nothing was written.'
% (len(files), total_findings))
print(' re-run with --apply to copy, and with --scrub to neutralise '
'absolute-path literals.')
return 2 if total_findings else 0
print('== sync: %d file(s) copied to %s (%d literal(s) scrubbed), %d finding(s) reported.'
% (copied, args.dst, scrubbed, total_findings))
return 0
if __name__ == '__main__':
sys.exit(main())